CN106442248B - Method and system for measuring emission concentration of particulate matter in gas - Google Patents

Abstract

The present invention relates to environmental monitoring field, in particular to granular material discharged concentration measuring method and system in a kind of gas, granular material discharged concentration measuring method in a kind of gas provided by the invention, including step S1, acquire the multiple groups standard sample under gas with various discharge environment, and a selected benchmark particulate matter and an at least candidate particles object, foundation correspond to the corresponding relationship under discharge environment described in the standard sample between benchmark particulate matter and the concentration of the candidate particles object；Step S2 measures the concentration of benchmark particulate matter described in the sample to be tested under corresponding gas discharge environment, and the concentration of the candidate particles object is obtained according to the corresponding relationship.The present invention also provides granular material discharged concentration measurement system in a kind of gas, principle of the measuring system based on above-mentioned measurement method.Granular material discharged concentration measuring method and system have the advantages that accuracy is higher and measurement process is simple in gas of the invention.

Description

Method and system for measuring emission concentration of particulate matter in gas

【Technical field】

The invention relates to the field of environmental monitoring, in particular to a method and system for measuring the emission concentration of particulate matter in gas.

【Background technique】

Generally, for the gas discharge point, the concentration of particulate matter emitted by it needs to be measured according to the requirements. At present, the weighing method is used as the standard measurement method for the emission of particulate matter concentration, but this method is cumbersome to operate as a standard measurement method for emission of particulate matter concentration, and it is impossible to perform continuous real-time measurement and provide measurement data in time.

In order to measure the emission concentration of particulate matter in gases such as coal-fired power plants in real time, the method of optical scattering is usually used for online measurement. In the flue gas emission of general coal-fired power plants, the water content is particularly high, and many small water droplets will be produced in the flue. The existence of these small water droplets will cause the incident light to scatter, and the optical scattering method cannot be used for online measurement. Whether the source of scattering is liquid droplets or solid particles. Therefore, the method of measuring the concentration of particulate matter in smoke by optical scattering cannot avoid the influence of liquid droplets, thus affecting the measurement results.

【Content of invention】

In order to overcome the existing technical problem of inaccurate measurement of particulate matter concentration in gas, the present invention provides a method and system for measuring the emission concentration of particulate matter in gas that can measure the concentration of particulate matter in gas in real time and with high accuracy.

One solution provided by the present invention to solve the above technical problems is to provide a method for measuring the emission concentration of particulate matter in gas, including step S1, collecting multiple sets of standard samples under different gas emission environments, and selecting a reference particulate matter and at least one to-be-measured Particles, establishing a corresponding relationship between the concentration of the reference particulate matter in the standard sample and the particulate matter to be measured in the corresponding discharge environment; step S2, measuring the concentration of the reference particulate matter in the sample to be measured in the corresponding gas discharge environment , measuring the concentration of the reference particulate matter in the sample to be tested, and obtaining the concentration of the particulate matter to be measured according to the corresponding relationship, the step S1 is specifically: step T101, obtaining the reference particulate matter in multiple groups of the standard samples and one of the particle size distribution relationship, light scattering intensity distribution relationship, and volume distribution relationship corresponding to the particle to be measured; step T102, measuring the concentration of the reference particle in the standard sample, and according to the particle size distribution relationship, light scattering intensity distribution relationship, and volume distribution relationship, to establish a corresponding relationship between the concentration of the reference particle and the concentration of the particle to be measured in the standard sample.

Preferably, the particle size distribution relationship between the reference particle and the particle to be measured can be obtained by measuring the particle size distribution diagram of a standard sample with a particle size measuring instrument.

Preferably, the distribution relationship is a particle size distribution relationship, and the above step T101 further includes: establishing a relationship including the particle size distribution relationship corresponding to the reference particle and the particle to be measured based on the obtained multiple sets of standard samples. A database of one or more of the number percentage, volume percentage, and mass percentage between the reference particle and the particle to be measured.

Preferably, the distribution relationship is a particle size distribution relationship, and the above step T102 is specifically: the particle size distribution relationship is represented by the mass percentage of the reference particle and the particle to be measured in the standard sample, and in the standard sample In the sample, the corresponding relationship between the concentration of the reference particle and the concentration of the particle to be measured is expressed as: Wherein, P1 is the mass percentage of the reference particle in the standard sample, P2 is the mass percentage of the particle to be measured in the standard sample, M1 is the concentration value of the reference particle, and M2 is the particle to be measured concentration value.

Preferably, in the above step S1, when collecting multiple sets of standard samples under different gas discharge environments, multiple sampling and multiple measurements are performed on the gas in the same discharge environment.

Preferably, the reference particulate matter is one of PM2.5, PM10, and total suspended particulate matter, and the particulate matter to be measured is one or more of PM2.5, PM10, and total suspended particulate matter. It is different from the reference particle.

In order to solve the above technical problems, the present invention also provides a system for measuring the emission concentration of particulate matter in gas, which includes:

The first processing unit is used to collect multiple sets of standard samples under different gas emission environments, and select a reference particle and at least one particle to be measured, and establish the reference particle and the particle to be measured in the standard sample corresponding to the emission environment. Measure the corresponding relationship between the concentration of particulate matter;

The second processing unit is used to measure the concentration of the reference particulate matter in the sample to be tested under the corresponding gas emission environment, and obtain the concentration of the particulate matter to be measured according to the corresponding relationship; the first processing unit includes: data acquisition A module, used to obtain one of the particle size distribution relationship, light scattering intensity distribution relationship, and volume distribution relationship corresponding to the reference particle and the particle to be measured in multiple groups of the standard samples; the data processing module is used to measure Obtain the concentration of the reference particle in the standard sample, and establish the relationship between the reference particle in the standard sample and the target particle according to one of the particle size distribution relationship, light scattering intensity distribution relationship, and volume distribution relationship. The corresponding relationship between the concentration of measured particulate matter.

Preferably, the first processing unit includes: a data acquisition module, configured to acquire the particle size distribution relationship, light scattering intensity distribution relationship, and volume distribution of the reference particle and the particle to be measured in multiple sets of the standard samples. One of the relationship; the data processing module is used to measure and obtain the concentration of the reference particulate matter in the standard sample, and according to one of the particle size distribution relationship, light scattering intensity distribution relationship, and volume distribution relationship, establish The corresponding relationship between the concentration of the reference particulate matter and the concentration of the particulate matter to be measured in the standard sample.

Preferably, the distribution relationship is a particle size distribution relationship, and the data acquisition module further includes a database, and the database includes the particle size distribution relationship corresponding to the reference particle and the particle to be measured in the standard sample.

Preferably, the second processing unit further includes: a measurement module, configured to measure the concentration of reference particulate matter in the sample to be tested; and

A calculation module, based on the reference particle concentration in the sample to be tested obtained by the measurement module, and the corresponding relationship to obtain the concentration of the particle to be tested.

Preferably, the second processing unit further includes a data display and storage module for displaying and storing the concentration of the particle to be measured obtained by the calculation module.

Compared with the prior art, in a method for measuring the emission concentration of particulate matter in gas provided by the present invention, by establishing the corresponding relationship between the concentration of the reference particulate matter and the concentration of the particulate matter to be measured in the standard sample in the corresponding gas discharge environment; The concentration of the reference particulate matter in the medium and the concentration of the particulate matter to be measured are obtained according to the corresponding relationship. Since the concentration of the particulate matter to be measured is calculated based on the concentration of the more accurate reference particulate matter, it is more real-time and faster than the traditional measurement method, and the measurement results are improved. accuracy.

Based on the particle size distribution relationship between the reference particle and the particle to be measured in the standard sample, the proportional relationship between the reference particle and the particle to be measured can be obtained, and the concentration between the reference particle and the particle to be measured can be established according to the proportional relationship Correspondence. Since the particle size distribution relationship can be used as a whole to calculate the concentration ratio relationship between the reference particle and the particle to be measured in the standard sample, a more accurate particle to be measured can be obtained by combining the concentration of the reference particle in one of the more accurate samples to be measured with the corresponding relationship. concentration.

Compared with the prior art, in the system for measuring the emission concentration of particulate matter in gas provided by the present invention, a reference particulate matter and at least one particulate matter to be measured are selected from multiple sets of standard samples by the first processing unit, and the standard sample is established. The corresponding relationship between the concentration of the reference particulate matter and the concentration of the particulate matter to be measured, and then measure the concentration of the reference particulate matter in the sample to be measured by the second processing unit, and obtain the concentration of the particulate matter to be measured according to the corresponding relationship, by selecting the reference For particulate matter, if the concentration of the reference particulate matter can be measured more accurately, the concentration of the particulate matter to be measured obtained from the concentration of the reference particulate matter is more accurate, so the system can obtain a more accurate concentration of the particulate matter to be measured.

Further, through the data acquisition module, the particle size distribution relationship corresponding to the reference particulate matter and the particulate matter to be measured in multiple sets of standard samples is obtained, and the data processing module obtains the corresponding relationship between the concentration of the reference particulate matter and the particulate matter to be measured according to the particle size distribution relationship, and the obtained The particle size distribution relationship can more accurately obtain the proportional relationship between the reference particle and the particle to be measured in the standard sample, so the final concentration of the particle to be measured is also correspondingly more accurate.

【Description of drawings】

Fig. 1 is an overall flowchart of a method for measuring the emission concentration of particulate matter in gas according to the present invention.

Fig. 2 is a schematic flowchart of step S1 in a method for measuring the emission concentration of particulate matter in gas according to the present invention.

Fig. 3 is a structural schematic diagram of a system for measuring the emission concentration of particulate matter in gas according to the present invention.

【Detailed ways】

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to Fig. 1, the first embodiment of the present invention provides a method for measuring the emission concentration of particulate matter in gas, including step S1, collecting multiple sets of standard samples under different gas emission environments, and selecting a reference particulate matter and at least one to be treated Measuring particulate matter, establishing a corresponding relationship between the concentration of the reference particulate matter in the standard sample in the corresponding emission environment and the concentration of the particulate matter to be measured; step S2, measuring the concentration of the reference particulate matter in the sample to be measured in the corresponding gas emission environment concentration, and obtain the concentration of the particulate matter to be measured according to the corresponding relationship.

When measuring the gas emitted by the factory, preferably, in the S1 step, the multiple sets of standard samples are obtained under different emission environments, and the different emission environments refer to different emission environments of different working conditions and dust removal technologies , and select a reference particle from the total suspended particles in multiple standard samples, the concentration of which can be measured more accurately by equipment, and establish the corresponding relationship between the reference particle concentration and the particle concentration to be measured, The purpose is to obtain the concentration of the particulate matter to be measured by corresponding to the concentration of the reference particulate matter.

In order to further improve the measurement accuracy of the method for measuring the emission concentration of particulate matter in gas, the method for measuring the emission concentration of particulate matter in gas further includes: performing multiple sampling and multiple measurements on the gas in the same emission environment to reduce measurement errors. By sampling and measuring gases in different emission environments, the corresponding relationship between the concentration of the reference particulate matter and the concentration of the particulate matter to be measured in different environments can be obtained.

The corresponding relationship can be measured by measuring the distribution of the particle size, light scattering intensity, volume, etc. corresponding to the reference particle and the particle to be measured in the gas, wherein the particle size distribution can show the particle size distribution of the particle in the standard sample, which can be obtained through The particle size distribution counts the ratio relationship among the reference particles, the particles to be measured and the total suspended particles, such as the number ratio relationship, mass ratio relationship, and size ratio relationship among the reference particles, the particles to be measured and the total suspended particles, etc., according to a certain Under the volume of gas, there is also a proportional relationship between the quantity, quality, size, etc. of the reference particulate matter, the particulate matter to be measured, and the total suspended particulate matter and the concentration, so the corresponding relationship between the concentration of the reference particulate matter and the particulate matter to be measured can be obtained;

The light scattering intensity distribution can show the light scattering intensity distribution of the particles in the standard sample, and the light scattering intensity ratio relationship corresponding to the reference particles, the particles to be measured and the total suspended particles can be calculated through the light scattering intensity distribution. There is also a proportional relationship between the light scattering intensity and the concentration of the reference particulate matter, the particulate matter to be measured and the total suspended particulate matter, and the corresponding relationship between the concentration of the reference particulate matter and the particulate matter to be measured can be obtained according to the proportional relationship.

The volume distribution can show the volume distribution of the particles in the standard sample, and the volume ratio relationship corresponding to the reference particles, the particles to be measured and the total suspended particles can be calculated through the volume distribution. According to a certain volume of gas, the reference particles, the particles to be measured and There is also a proportional relationship between the volume and the concentration of the total suspended particulate matter, and the corresponding relationship between the concentration of the reference particulate matter and the particulate matter to be measured can be obtained according to the proportional relationship.

Since the particle size distribution corresponding to the reference particle and the particle to be measured can be obtained more accurately, in order to obtain a relatively high-accuracy corresponding relationship between the concentration of the reference particle and the particle to be measured, preferably, please refer to Fig. 2. The specific steps in the above step S1 include: step T101, obtaining the particle size distribution relationship, the light scattering intensity distribution relationship, and the volume distribution relationship corresponding to the reference particle and the particle to be measured in multiple groups of the standard samples. A; step T102, measuring and obtaining the concentration of the reference particle in the standard sample, and according to one of the particle size distribution relationship, light scattering intensity distribution relationship, and volume distribution relationship, establishing the standard particle concentration in the standard sample The corresponding relationship between the concentration of the reference particle and the concentration of the particle to be measured.

The particle size distribution relationship between the reference particle and the particle to be measured in the step T101 can be obtained by measuring the particle size distribution diagram of the standard sample with a particle size measuring instrument. The distribution of the number, volume, and mass of the sample can be calculated from the particle size distribution diagram to obtain the proportional relationship between the number, volume, and mass of the reference particles in the standard sample and the particles to be measured.

Preferably, the distribution relationship is a particle size distribution relationship, and the step T101 further includes: establishing a relationship including the particle size distribution relationship corresponding to the reference particle and the particle to be measured based on the obtained multiple sets of standard samples. A database of one or more of the number percentage, volume percentage, and mass percentage between the reference particle and the particle to be measured. The database includes the parameter data required for calculating the particle concentration to be measured based on the standard particle concentration in different environments, and the parameter data is one of the number percentage, volume percentage, mass percentage or Several combinations.

In the step T102, the corresponding relationship between the concentration of the reference particulate matter in the standard sample and the concentration of the particulate matter to be measured is established as follows:

Obtaining the corresponding relationship between the reference particle and the concentration of the particle to be measured in the standard sample by calling the pre-stored data, the pre-stored data is the parameter data corresponding to the reference particle and the particle to be measured in the standard sample obtained in advance;

Or obtain the corresponding relationship between the concentration of the reference particle in the standard sample and the concentration of the particle to be measured by measuring, that is, when measuring the sample to be tested, by measuring the parameter data of the reference particle and the particle to be measured in the standard sample to obtain The corresponding relationship between the reference particulate matter and the concentration of the particulate matter to be measured in the sample to be tested.

Since the mass and concentration of the reference particulate matter and the particulate matter to be measured are in a proportional relationship, it is preferred that the particle size distribution corresponding to the reference particulate matter and the particulate matter to be measured is represented by the mass percentage corresponding to the reference particulate matter and the particulate matter to be measured .

Further, the step of establishing the corresponding relationship between the concentration of the reference particulate matter and the concentration of the particulate matter to be measured in the standard sample further includes: in the standard sample, the The corresponding relationship is expressed as: Wherein, P1 is the mass percent of the reference particle in the standard sample, P2 is the mass percent of the particle to be measured in the standard sample, M1 is the concentration value of the reference particle, and M2 is the particle to be measured concentration value.

When the particulate matter to be measured is total suspended particulate matter, then in the standard sample, the corresponding relationship between the concentration of the reference particulate matter and the total suspended particulate matter is expressed as: Wherein, P1 is the mass percentage of the reference particle in the standard sample, M1 is the concentration value of the reference particle, and M3 is the concentration value.

Based on the first embodiment of the present invention, the measurement of the emission concentration of particulate matter in the flue gas of a coal-fired power plant is used as some specific examples of the present invention.

Specifically, multiple sets of standard samples are collected under different gas emission environments, and the benchmark particulate matter is selected as PM2.5, and the particulate matter to be measured is PM10 and total suspended particulate matter. The specific measurement method includes the following step S1a: establish PM2.5 and the measured Correspondence between the concentrations of the particulate matter; step S2a, measuring the concentration of the PM2.5 in the sample to be tested, and obtaining the concentration of the particulate matter to be measured according to the corresponding relationship.

Specifically, in step S1a, the particle size distribution of the reference particles and the particles to be measured in the standard sample after dedusting the gas emission environment of the coal-fired power plant generator set under different working conditions was studied, and different The particle size distribution of the standard sample after dedusting by advanced dedusting technology, the results have the following characteristics:

1. Under the condition that the working condition of the generating set is determined, the particle size distribution of the standard sample is relatively definite.

2. Under the condition of dedusting technology, the dedusting efficiency is basically close. After the same dedusting technology, the particle size distribution of standard samples is also basically the same.

Based on the above characteristics, under the determined working conditions of coal-fired power plant generator sets and dust removal technical conditions, the mass percentages of PM2.5 and PM10 in the standard sample are certain, and only the emission concentration of PM2.5 needs to be measured. The emission concentration of PM10 and total suspended particulate matter can be obtained according to the corresponding relationship between the corresponding mass percentage and the concentration. Specifically, under the determined working conditions of coal-fired power plant generating units and dust removal technical conditions, P1 is the mass percentage of PM2.5 in the standard sample, P2 is the mass percentage of PM10 in the standard sample, and PM2 .5 The emission concentration is obtained as M1 through the test of the measuring equipment, and combined with the following corresponding relationship: formula (1) and formula (2) to obtain the emission concentration M2 of PM10 and the emission concentration M3 of total suspended particulate matter. The specific formula is as follows:

Further, based on different working conditions and different emission environments of dust removal technology, the particle size distribution relationship corresponding to the reference particle and the particle to be measured in multiple groups of the standard samples is obtained, and the benchmark is established according to the particle size distribution relationship. A parameter database required for the corresponding relationship between the particulate matter and the concentration of the particulate matter to be measured. The particle size distribution of the total suspended particulate matter under different working conditions and dust removal technology emission environments can be counted. According to the particle size distribution of the total suspended particulate matter, the parameters of the mass percentage of the reference particulate matter and the measured particulate matter in the total suspended particulate matter can be analyzed, so that The parameter database is further obtained.

The specific steps of establishing the database include steps S1a1-S1a2.

Step S1a1: Record the different working conditions of the coal-fired power plant site and the corresponding different dust removal technologies;

Step S1a2: measure the particle size distribution of multiple sets of standard samples in the coal-fired power plant site in the step S1a1;

Step S1a3: Statistically organize the particle size distribution in the step S1a2 to obtain the mass percentage corresponding to the reference particle and the particle to be measured, and perform repeated test verification.

Specifically, the working conditions in step S1a1 include the quality of coal combustion, the power generated by the generator set, the humidity of the flue gas, the composition of the flue gas, and the like. The dust removal technology includes mechanical dust removal, wet dust removal, electrostatic dust removal, bag dust removal, etc. In step S1a2, the sampler is inserted into the flue containing particulate matter to obtain particulate matter, which can be sampled according to the standard of GB/T 15432-1995 "Gravimetric Method for Determination of Total Suspended Particulate Matter in Ambient Air". Use a particle size analyzer to measure the particle size distribution of the obtained total suspended particles, and obtain a particle size distribution map. After fitting and counting the particle size distribution map, the parameter data P1 and P2 can be obtained respectively, namely PM2.5 and PM10 The mass percent of total suspended particulate matter.

Specifically, in step S2a, measure the concentration of PM2.5 in the sample to be tested under the current working conditions and dust removal technology, and obtain corresponding The parameter data under the current working conditions and dust removal technology in the above database, and calculate and obtain the particle emission concentration value to be measured according to the corresponding relationship.

Further, S2a includes the following steps:

Step S2a1: Real-time sampling of the particulate matter to be measured emitted from different positions in the flue of the coal-fired power plant;

Step S2a2: measure the concentration of PM2.5;

Step S2a3: obtaining the data value of PM2.5 concentration;

Step S2a4: According to the current working conditions and different emission environments of dust removal technology, correspondingly obtain the parameter data under the current working conditions and dust removal technology in the above database, and combine the measured PM2.5 concentration data values and the concentrations of PM2.5 and particulate matter to be measured The corresponding relationship between them is used to obtain the emission concentration value of the particulate matter to be measured.

Step S2a5: Store the emission concentration value of the particulate matter to be measured obtained in real time.

Specifically, in step S2a1, since the coal-fired power plant emits the particulate matter to be measured through the flue, the concentration of the particulate matter to be measured at different positions in the flue is different, so the measurement at different positions can improve the accuracy of the results. In step S2a2, the concentration of PM2.5 in the particulate matter to be measured is measured by the measuring device, and the measured PM2.5 concentration data is output as an analog signal. In step S2a3, the PM2.5 concentration value is obtained by receiving and converting the analog signal of the PM2.5 concentration data measured by the measuring device into a digital signal that can be recognized by the computer. In step S2a5, the emission of the coal-fired power plant can be analyzed later by using the stored emission concentration value.

In order to further obtain the emission concentration of the particulate matter to be measured with higher accuracy, in a specific embodiment of the present invention, the Pegasor Mi3 equipment of Finland is used to measure the concentration of PM2.5 in the particulate matter to be measured, and the Pegasor Mi3 equipment can be more accurate. The concentration of particles with a particle size of less than 2.5um can be measured, and the concentration range that this equipment can measure is 0.001-300mg/m ³ . Specifically, based on the Pegasor Mi3 device, the reference particle PM2.5 is measured in real time, and the measurement is based on the principle of charge escape to obtain the concentration data of PM2.5, and the concentration data of PM2.5 is converted into an analog signal of 4-20mA output, the analog signal is then converted into a digital signal. According to the working conditions and dust removal technology of coal-fired power plants, the parameter data of the mass percentages P1 and P2 of PM2. Substituting the concentration value and the called P1 and P2 into formula (1) and formula (2) to calculate the emission concentration of the particulate matter to be measured, and finally store the obtained emission concentration of the particulate matter to be measured, so as to facilitate the later emission of coal-fired power plants Do analysis.

Further, the present invention provides the following specific examples for further illustration. Table 1 shows the mass percentages of PM2.5 and PM10 in the total suspended particulate matter obtained under different dust removal methods after measuring multiple standard samples.

Table 1 The mass percentage of PM2.5 and PM10 in the total suspended particulate matter under different dust removal methods

project Dust removal method PM2.5 PM10 First specific embodiment mechanical dust removal 29.5% 57.9% Second specific embodiment Wet dust removal 29.5% 71.6% Third specific embodiment Electrostatic precipitator 30.6% 60.1% Fourth specific embodiment Desulfurization by electrostatic dust removal and humidification method 64.1% 78.7% Fifth specific embodiment bag filter 25.2% 42.6%

The first specific embodiment: under the current working conditions, the mass percentage of PM2.5 in the database corresponding to the total suspended particulate matter after dust removal by mechanical dust removal is 29.5% (P1), and the mass percentage of PM10 in the total suspended particulate matter is 57.9%. (P2), using the Pegasor Mi3 device to measure in real time the concentration of PM2.5 in the particulate matter to be tested under the current working condition is 2.60mg/m ³ (M1), combining formula (1) and formula (2) can get real-time PM10 The concentration is 5.10 mg/m ³ (M2), and the concentration of total suspended particulate matter is 8.81 mg/m ³ (M3).

The second specific embodiment: under the current working conditions, the mass percentage of PM2.5 in the database corresponding to the total suspended particulate matter is 29.5% (P1), and the mass percentage of PM10 in the total suspended particulate matter is 71.6% after dust removal by wet dust removal. (P2), using the Pegasor Mi3 device to measure in real time the concentration of PM2.5 in the particulate matter to be tested under the current working condition is 2.60mg/m ³ (M1), combining formula (1) and formula (2) can get real-time PM10 The concentration is 6.31 mg/m ³ (M2), and the concentration of total suspended particulate matter is 8.81 mg/m ³ (M3).

The third specific embodiment: under the current working conditions, the mass percentage of PM2.5 in the database corresponding to the total suspended particulate matter is 30.6% (P1), and the mass percentage of PM10 in the total suspended particulate matter is 60.1% after dust removal by means of electrostatic precipitator (P2), using the Pegasor Mi3 device to measure in real time the concentration of PM2.5 in the particulate matter to be tested under the current working condition is 2.60mg/m ³ (M1), combining formula (1) and formula (2) can get real-time PM10 The concentration is 5.11mg/m ³ (M2), and the concentration of total suspended particulate matter is 8.50 mg/m ³ (M3).

The fourth specific embodiment: under the current working conditions, the mass percentage of PM2.5 in the database corresponding to the total suspended particulate matter is 64.1% (P1), and the mass percentage of PM10 in the total suspended particulate matter is 64.1% (P1) after dedusting by means of electrostatic dust removal, humidification and desulfurization. is 78.7% (P2), the concentration of PM2.5 in the particulate matter to be measured under the current working condition is 2.60mg/m ³ (M1) measured in real time by Pegasor Mi3 equipment, combined with formula (1) and formula (2) can be real-time The obtained PM10 concentration was 3.19 mg/m ³ (M2), and the total suspended particulate matter concentration was 4.06 mg/m ³ (M3).

The fifth specific embodiment: under the current working conditions, the mass percentage of PM2.5 in the database corresponding to the total suspended particulate matter is 25.2% (P1), and the mass percentage of PM10 in the total suspended particulate matter is 42.6% after dust removal by bag type dust removal. %(P2), using Pegasor Mi3 equipment to measure in real time the concentration of PM2.5 in the particulate matter to be tested under the current working condition is 2.60mg/m ³ (M1), combining formula (1) and formula (2) to obtain PM10 in real time The concentration is 4.40mg/m ³ (M2), and the concentration of total suspended particulate matter is 10.32mg/m ³ (M3).

In summary, in the first specific embodiment to the fifth specific embodiment described above, by selecting the on-site working conditions and dust removal methods in the established database, generally the PM2.5 and PM10 corresponding to each dust removal method account for the total suspended The mass percentage of particulate matter is constant, so the emission concentration of PM10 and total suspended particulate matter in the particulate matter to be measured can be obtained according to the on-site working conditions and a certain dust removal method.

In some other specific embodiments of the present invention, the reference particulate matter in the sample to be tested is selected as P10, and the measuring device can measure the concentration of PM10 more accurately, and the particulate matter to be measured is one or more of PM2.5 and total suspended particulate matter. One, by establishing the corresponding relationship between PM10 and the concentration of the particulate matter to be measured; the concentration of PM10 in the sample to be tested is measured by the above-mentioned measuring device, and the concentration of the particulate matter to be measured is obtained according to the corresponding relationship.

Further, the corresponding relationship is expressed as: Wherein, P1' is the mass percentage of PM2.5 in the standard sample, P2' is the mass percentage of PM10 in the standard sample, M1' is the PM2.5 concentration value, M2' is the PM10 concentration value, and M3' is the total suspended particulate matter concentration value.

In other specific embodiments of the present invention, the reference particulate matter in the sample to be tested is selected as total suspended particles, and the measuring device can more accurately measure the concentration of the total suspended particulate matter. The particulate matter to be measured is PM2.5 and PM10. The corresponding relationship between the suspended particulate matter and the concentration of the particulate matter to be measured; the concentration of the total suspended particulate matter is measured by the above-mentioned measuring device, and the concentration of the particulate matter to be measured is obtained according to the corresponding relationship. The corresponding relationship is expressed as: M1"=M3"×P1", M2"=M3"×P2", wherein, P1" is the mass percentage of PM2.5 in the standard sample, and P2" is the mass percentage of PM10 in the standard sample , M1" is the concentration value of PM2.5, M2" is the concentration value of PM10, and M3" is the concentration value of total suspended particulate matter.

The above-mentioned specific embodiments in the present invention are only examples, and are not intended to limit the present invention.

Referring to Fig. 3, the second embodiment of the present invention provides a system for measuring the emission concentration of particulate matter in gas, which includes:

The first processing unit 10 is used to collect multiple sets of standard samples under different gas emission environments, and select a reference particle and at least one particle to be measured, and establish the reference particle and the standard particle in the standard sample corresponding to the emission environment. The corresponding relationship between the concentrations of the particles to be measured;

The second processing unit 20 is configured to measure the concentration of the reference particulate matter in the sample to be tested under the corresponding gas emission environment, and obtain the concentration of the particulate matter to be measured according to the corresponding relationship.

Specifically, the first processing unit 10 collects multiple sets of standard samples under different gas emission environments, and selects a reference concentration and at least one particulate matter to be measured in multiple sets of standard samples, and measures the reference particulate matter and The corresponding particle size distribution relationship of the particles to be measured, through which the corresponding mass percentages of the reference particles and the particles to be measured are obtained through the statistics of the particle size distribution relationship, so as to establish the corresponding relationship between the reference particles and the particles to be measured. When measuring the emission concentration of the particulate matter to be measured in the sample to be measured, the concentration of the reference particulate matter in the sample to be measured is measured by the second processing unit 20, and the corresponding discharge environment particulate matter to be measured is calculated according to the corresponding relationship obtained by the first processing unit 10 concentration.

In order to further obtain a more accurate concentration of particulate matter to be measured, in some embodiments of the present invention, the first processing unit 10 further includes a data acquisition module 101 and a data processing module 102; the second processing unit 20 further includes a measurement Module 201, calculation module 202. The data acquisition module 101 is used to acquire one of the particle size distribution relationship, the light scattering intensity distribution relationship, and the volume distribution relationship corresponding to the reference particle and the particle to be measured in multiple groups of the standard samples; the data processing module 102 , for measuring and obtaining the concentration of the reference particle in the standard sample, and establishing the reference particle in the standard sample according to one of the particle size distribution relationship, light scattering intensity distribution relationship, and volume distribution relationship Corresponding relationship with the concentration of the particulate matter to be measured. The measurement module 201 is used to measure the concentration of the reference particle in the sample to be tested; the calculation module 202 is used to obtain the concentration of the reference particle in the sample to be tested based on the measurement module 201 and the corresponding relationship. concentration of particulate matter.

The above-mentioned corresponding relationship may be established when measuring the sample to be tested, or may be established in advance. Since the particle size distribution relationship can be obtained more accurately, therefore, when establishing the corresponding relationship, preferably, the distribution relationship is a particle size distribution relationship, and the reference particles and the reference particles in multiple groups of the standard samples are acquired by the data acquisition module 101. Describe the particle size distribution relationship corresponding to the particles to be measured. The data acquisition module 101 sends the particle size distribution relationship to the data processing module 102; the data processing module 102 measures the concentration of the reference particle in the standard sample, and the corresponding mass percentage relationship between the reference particle and the particle to be measured in the statistical particle size distribution relationship, and finally The corresponding relationship between the concentration of the reference particle and the concentration of the particle to be measured is obtained through processing.

After the corresponding relationship between the concentration of the reference particle and the concentration of the particle to be measured is established, based on the corresponding relationship, the concentration of the reference particle in the sample to be tested is measured by the measurement module 201, and then the calculation module 202 is used to correspond to the concentration of the reference particle in the standard sample. The particle size distribution relationship between the reference particle and the particle to be measured is used to obtain the concentration of the particle to be measured according to the corresponding relationship.

The data acquisition module 101 further includes a database (not shown in the figure), and the database includes the particle size distribution relationship corresponding to the reference particle and the particle to be measured in the standard sample.

Further, the database is based on the particle size distribution relationship to form a parameter database of the mass percentages of the reference particles in multiple sets of standard samples corresponding to the particles to be measured, and the mass percentage parameters include the percentage of the reference particles in the total suspension The mass percentage of particulate matter and the mass percentage of the particulate matter to be measured accounted for the total suspended particulate matter respectively.

In some specific embodiments of the present invention, when the reference particle is PM2.5, the measurement module 201 can be selected from Pegasor Mi3 equipment in Finland, and the Pegasor Mi3 equipment can obtain a more accurate concentration of PM2.5 based on the principle of charge escape value. The corresponding relationship between the concentration of the reference particulate matter and the concentration of the particulate matter to be measured in multiple sets of standard samples is established in advance through the data acquisition module 101 and the data processing module 102 . The measurement module 201 transmits the measured PM2.5 concentration to the calculation module 202 after measuring the concentration of PM2.5 in the particulate matter to be measured in the sample to be measured, and the calculation module 202 is based on the concentration of PM2.5 and the particle size distribution of the particulate matter to be measured The particle size distribution relationship between the reference particle and the particle to be tested corresponds to the standard sample in the database, and the concentration of the particle to be tested is obtained according to the corresponding relationship.

In order to make the concentration of the particle to be measured measured by the present invention statistically analyzed, the second processing unit 20 further includes a data display and storage module 203 for displaying and storing the concentration of the particle to be measured obtained by the calculation module 202 . By storing the concentration of the particulate matter to be measured, it is convenient to analyze the concentration of the particulate matter to be measured for a period of time.

Compared with the prior art, in a method for measuring the emission concentration of particulate matter in gas provided by the present invention, by establishing the corresponding relationship between the concentration of the reference particulate matter and the concentration of the particulate matter to be measured in the standard sample in the corresponding gas discharge environment; The concentration of the reference particulate matter in the medium and the concentration of the particulate matter to be measured are obtained according to the corresponding relationship. Since the concentration of the particulate matter to be measured is calculated based on the concentration of the more accurate reference particulate matter, it is more real-time and faster than the traditional measurement method, and the measurement results are improved. accuracy.

Based on the particle size distribution relationship between the reference particle and the particle to be measured in the standard sample, the proportional relationship between the reference particle and the particle to be measured can be obtained, and the concentration between the reference particle and the particle to be measured can be established according to the proportional relationship Correspondence. Since the particle size distribution relationship can be used as a whole to calculate the proportion of the reference particles in the standard sample and the particles to be measured, a more accurate concentration of the particles to be measured can be obtained from one of the more accurate concentrations of the reference particles in the sample to be tested combined with the corresponding relationship. .

Compared with the prior art, in the system for measuring the emission concentration of particulate matter in gas provided by the present invention, a reference particulate matter and at least one particulate matter to be measured are selected from multiple sets of standard samples by the first processing unit, and the standard sample is established. The corresponding relationship between the concentration of the reference particulate matter and the concentration of the particulate matter to be measured, and then measure the concentration of the reference particulate matter in the sample to be measured by the second processing unit, and obtain the concentration of the particulate matter to be measured according to the corresponding relationship, by selecting the reference For particulate matter, if the concentration of the reference particulate matter can be measured more accurately, the concentration of the particulate matter to be measured obtained from the concentration of the reference particulate matter is more accurate, so the system can obtain a more accurate concentration of the particulate matter to be measured.

Further, through the data acquisition module, the particle size distribution relationship corresponding to the reference particulate matter and the particulate matter to be measured in multiple sets of standard samples is obtained, and the data processing module obtains the corresponding relationship between the concentration of the reference particulate matter and the particulate matter to be measured according to the particle size distribution relationship, and the obtained The particle size distribution relationship can more accurately obtain the proportional relationship between the reference particle and the particle to be measured in the standard sample, so the final concentration of the particle to be measured is also correspondingly more accurate.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements within the principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. granular material discharged concentration measuring method in a kind of gas, it is characterised in that: step S1, acquisition gas with various discharge environment Under multiple groups standard sample, and a selected benchmark particulate matter and an at least candidate particles object are established described under corresponding discharge environment Corresponding relationship between benchmark particulate matter described in standard sample and the concentration of the candidate particles object；Step S2, measurement correspond to Gas discharges the concentration of benchmark particulate matter described in the sample to be tested under environment, and described to be measured according to corresponding relationship acquisition The concentration of particulate matter, the step S1 specifically: step T101, obtain benchmark particulate matter described in standard sample described in multiple groups and The corresponding particle diameter distribution relationship of the candidate particles object；Step T102, measurement obtain benchmark particle described in the standard sample The concentration of object, and benchmark particulate matter described in the standard sample and the candidate particles are established according to the particle diameter distribution relationship Corresponding relationship between the concentration of object, above-mentioned steps T102 specifically: particle diameter distribution relationship institute in the standard sample The mass percent for stating benchmark particulate matter and the candidate particles object indicates, in the standard sample, the benchmark particulate matter Corresponding relationship between the concentration of the candidate particles object is expressed as: wherein, P1 is the standard sample to M2=M1 × (P2/P1) The mass percent of benchmark particulate matter described in product, the mass percent that P2 is candidate particles object described in the standard sample, M1 is the concentration value of the benchmark particulate matter, and M2 is the concentration value of the candidate particles object.

2. granular material discharged concentration measuring method in gas as described in the appended claim 1, it is characterised in that: the distribution relation is Particle diameter distribution relationship, above-mentioned steps T101 further comprises: benchmark particle described in standard sample described in the multiple groups based on acquisition It includes the benchmark particulate matter and the candidate particles object that object and the corresponding particle diameter distribution relationship of the candidate particles object, which establish one, Between one of number percent, percent by volume, mass percent or several databases.

3. granular material discharged concentration measuring method in the gas as described in claim any one of 1-2, it is characterised in that: the base Quasi- particulate matter is one of PM2.5, PM10, overall suspended pellet, and the candidate particles object is PM2.5, PM10, always suspension One of grain object is several, and the candidate particles object is not same with the benchmark particulate matter.

4. granular material discharged concentration measurement system in a kind of gas, it is characterised in that: comprising: first processing units, for adopting Collect the multiple groups standard sample under gas with various discharge environment, and a selected benchmark particulate matter and an at least candidate particles object, establishes Corresponding pass under corresponding discharge environment described in the standard sample between benchmark particulate matter and the concentration of the candidate particles object System；

The second processing unit, for measuring the concentration of benchmark particulate matter described in the sample to be tested under corresponding gas discharge environment, And the concentration of the candidate particles object is obtained according to the corresponding relationship, the first processing units include: data acquisition module, For obtaining benchmark particulate matter described in standard sample described in multiple groups and the corresponding particle diameter distribution relationship of the candidate particles object；Number According to processing module, for measuring the concentration for obtaining benchmark particulate matter described in the standard sample, and according to the particle diameter distribution Relationship establishes the corresponding relationship between benchmark particulate matter described in the standard sample and the concentration of the candidate particles object.

5. granular material discharged concentration measurement system in gas as claimed in claim 4, it is characterised in that: the distribution relation is Particle diameter distribution relationship, the data acquisition module further comprise database, and the database includes institute in the standard sample State benchmark particulate matter and the corresponding particle diameter distribution relationship of the candidate particles object.

6. granular material discharged concentration measurement system in gas as claimed in claim 5, it is characterised in that: the second processing list Member further comprises: measurement module, for measuring the concentration of benchmark particulate matter in the sample to be tested；And

Computing module benchmark particle concentration and described corresponding is closed in the sample to be tested obtained based on the measurement module System obtains the concentration of the candidate particles object.

7. granular material discharged concentration measurement system in gas as recited in claim 6, it is characterised in that: the second processing list Member further comprises that data show memory module, obtains the candidate particles object by the computing module for showing and storing Concentration.