CN106642125A - Temperature control method and device for regenerative radiant tube - Google Patents
Temperature control method and device for regenerative radiant tube Download PDFInfo
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- CN106642125A CN106642125A CN201611104979.2A CN201611104979A CN106642125A CN 106642125 A CN106642125 A CN 106642125A CN 201611104979 A CN201611104979 A CN 201611104979A CN 106642125 A CN106642125 A CN 106642125A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
- F23D14/60—Devices for simultaneous control of gas and combustion air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2208/00—Control devices associated with burners
- F23D2208/005—Controlling air supply in radiant gas burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/14—Special features of gas burners
- F23D2900/1412—Special features of gas burners for radiant burners
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
The invention discloses a temperature control method and device for a regenerative radiant tube. The method comprises the steps as follows: the temperature of the radiant tube is collected; whether gas is cut off is judged; and if the gas is cut off, proportion-differential control is performed on the opening degree of a gas control valve and the opening degree of an air regulating valve according to the temperature of the radiant tube and the target temperature. With the method, the bad effect of proportion-integral-derivative (PID) control on the system can be eliminated, the control accuracy can be improved, the burning efficiency of the radiant tube can be improved, the operation stability of the system can be effectively guaranteed, and the reliability of equipment can be further guaranteed.
Description
Technical Field
The invention relates to the technical field of radiant tubes, in particular to a temperature control method and device of a heat accumulating type radiant tube.
Background
In the related art, the core of the regenerative radiant tube temperature control is to stably control the gas control valve and the air regulating valve, for example, by PID (proportional, integral, derivative) control.
However, the integration part of the PID is mainly used to eliminate the static error, but has a bad influence on the dynamic performance of the system. For example, when the starting is finished or greatly increased or reduced, the system has a large output in a short time, but due to the effect of integral accumulation, the control quantity is overtime, so that the actuator may operate the limit control quantity of the maximum action range, thereby causing a large overshoot of the system, even causing a large oscillation of the system, and reducing the accuracy of the control.
In addition, in the industrial furnace of the heat accumulating type radiant tube, the radiant tube is occasionally burnt through due to reasons such as uneven heating, improper air-fuel ratio configuration and the like, and further production accidents are caused. However, in the related art, it is generally considered that the surface temperature of the radiant tube has a temperature difference of 50 ℃ to 100 ℃, and due to the fact that there are various conditions in use, the actual radiant tube has a higher temperature difference, so that the temperature of any position on the radiant tube cannot actually reflect the condition of the whole radiant tube, if only one temperature detection point is arranged, the overtemperature alarm is easy to miss the overtemperature judgment time point, and further a fault is generated, especially a U-shaped radiant tube and a W-shaped radiant tube, and the stability and reliability cannot be effectively ensured.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a method for controlling the temperature of a regenerative radiant tube, which can eliminate the adverse effect of PID control on the system and improve the accuracy of control.
Another object of the present invention is to provide a temperature control device for a regenerative radiant tube.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a method for controlling a temperature of a regenerative radiant tube, including the following steps: collecting the temperature of the radiant tube; judging whether the fuel gas is cut off or not; if yes, the opening degrees of the air control valve and the air regulating valve are controlled proportionally and differentially according to the temperature of the radiant tube and the target temperature.
According to the temperature control method of the heat accumulating type radiant tube, when the fuel gas is cut off, the opening degrees of the fuel gas control valve and the air regulating valve can be subjected to proportional and differential control according to the temperature of the radiant tube and the target temperature, so that the adverse effect of PID control on a system is eliminated, the control accuracy is improved, the combustion efficiency of the radiant tube is improved, the running stability of the system is effectively ensured, and the reliability of equipment is further ensured.
Further, in an embodiment of the present invention, the collecting the temperature of the radiation tube further includes: detecting the temperature of a plurality of temperature detection points on the radiant tube; and if the temperature of the plurality of temperature detection points is detected to meet the preset condition, obtaining the temperature of the radiant tube according to the temperatures of the plurality of temperature detection points and the corresponding preset weight.
Further, in an embodiment of the present invention, the radiant tube includes a first heat storage body and a second heat storage body, wherein the plurality of temperature detection points includes at least a first temperature detection point, a second temperature detection point, and a third temperature detection point, the first temperature detection point is a middle point of the radiant tube, the second temperature detection point is a highest temperature point between the middle point of the radiant tube and the first heat storage body, and the third temperature detection point is a highest temperature point between the middle point of the radiant tube and the second heat storage body.
Further, in an embodiment of the present invention, after the detecting the temperatures of the plurality of temperature detection points on the radiant tube, the method further includes: if the temperature of any one of the temperature detection points is greater than a first preset temperature value, alarming, and if the continuous alarming time is greater than a first preset time value, cutting off the fuel gas; or if the temperature of any one of the temperature detection points is greater than a second preset temperature value, cutting off the fuel gas, wherein the second preset temperature value is greater than the first preset temperature value; or if the change value of the temperature of the plurality of temperature detection points in the preset time is greater than the preset threshold value, alarming.
Further, in one embodiment of the present invention, the proportional, derivative control is performed according to the following equation:
wherein, Tβ＝0For integrating the separation time, and when the gas is cut off, Tβ＝0For the gas control valve off time, β is an integral coefficient, where at Tβ＝0During time β equals 0, otherwise β equals 1, T is the sample time.
In order to achieve the above object, in another aspect, the present invention provides a temperature control apparatus for a regenerative radiant tube, which employs the above method, wherein the apparatus includes: the acquisition module is used for acquiring the temperature of the radiant tube; the judging module is used for judging whether the fuel gas is cut off or not; and the control module is used for carrying out proportional and differential control on the opening degrees of the gas control valve and the air regulating valve according to the temperature of the radiant tube and the target temperature when the gas is cut off.
According to the temperature control device of the heat accumulating type radiant tube, when the fuel gas is cut off, the opening degrees of the fuel gas control valve and the air regulating valve can be subjected to proportional and differential control according to the temperature of the radiant tube and the target temperature, so that the adverse effect of PID control on a system is eliminated, the control accuracy is improved, the combustion efficiency of the radiant tube is improved, the running stability of the system is effectively ensured, and the reliability of equipment is further ensured.
Further, in one embodiment of the present invention, the acquisition module includes: the detection unit is used for detecting the temperatures of a plurality of temperature detection points on the radiant tube; and the acquisition unit is used for acquiring the temperature of the radiant tube according to the temperatures of the temperature detection points and the corresponding preset weights when the temperature of the temperature detection points is detected to meet the preset conditions.
Further, in an embodiment of the present invention, the radiant tube includes a first heat storage body and a second heat storage body, wherein the plurality of temperature detection points includes at least a first temperature detection point, a second temperature detection point, and a third temperature detection point, the first temperature detection point is a middle point of the radiant tube, the second temperature detection point is a highest temperature point between the middle point of the radiant tube and the first heat storage body, and the third temperature detection point is a highest temperature point between the middle point of the radiant tube and the second heat storage body.
Further, in an embodiment of the present invention, the apparatus further includes: the alarm protection module is used for giving an alarm when the temperature of any one of the temperature detection points is greater than a first preset temperature value after the temperature of the temperature detection points on the radiant tube is detected, and cutting off fuel gas when the continuous alarm time is greater than a first preset time value; or when the temperature of any one of the plurality of temperature detection points is greater than a second preset temperature value, cutting off the fuel gas, wherein the second preset temperature value is greater than the first preset temperature value; or when the change value of the temperature of the plurality of temperature detection points in the preset time is larger than the preset threshold value, alarming.
Further, in one embodiment of the present invention, the proportional, derivative control is performed according to the following equation:
wherein, Tβ＝0For integrating the separation time, and when the gas is cut off, Tβ＝0For the gas control valve off time, β is an integral coefficient, where at Tβ＝0During time β equals 0, otherwise β equals 1, T is the sample time.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a temperature control system of a regenerative radiant tube according to an embodiment of the present invention;
fig. 2 is a flowchart of a temperature control method of a regenerative radiant tube according to an embodiment of the present invention;
fig. 3 is a flowchart of a temperature control method of a regenerative radiant tube according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a temperature control device of a regenerative radiant tube according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Before describing the method and apparatus for controlling the temperature of the regenerative radiant tube according to the embodiments of the present invention, the importance of accurately controlling the temperature of the regenerative radiant tube will be briefly described.
At present, the regenerative radiant tube is widely used in the industrial heating furnace as a heating source, and the combustion mode of the regenerative radiant tube combustion system is as follows: firstly, cold air is heated by a heat accumulator of the burner A and is mixed with gas for combustion, secondly, the cold air is heated by hot flue gas in the radiant tube and is discharged after passing through the heat accumulator of the burner B, wherein after a set time, the change of the flowing directions of the air and the hot flue gas and the on-off of the gas are realized through the control of a special valve, the cold air flows in from the burner B, and the hot flue gas is discharged after passing through the heat accumulator of the burner A. Cold air and hot flue gas flow through the heat accumulator of A nozzle and B nozzle so alternately, and then exchange the heat through the heat accumulator, and the air can be preheated to and be close to radiant tube pipe wall temperature, reduces through the flue gas temperature promptly, has realized the thermal recovery of flue gas.
Wherein, the temperature control to the radiant tube adopts general PID temperature control, if set up a temperature detection point on the radiant tube, therefore the radiant tube temperature of gathering only sets up an overtemperature alarm to directly stop the gas trip valve of radiant tube behind the overtemperature.
However, the following drawbacks exist in the related art:
1) the design is not carried out according to the characteristics of the heat accumulating type radiant tube, namely, due to the effect of integral accumulation, the control quantity is overtime, the executing mechanism can operate the limit control quantity of the maximum action range, the system is greatly overshot, even the system is greatly vibrated, the control deviation is caused, and the expected effect is not achieved.
2) The surface temperature of the radiant tube is not uniform, if only one temperature measuring point is arranged, the conditions of two burners of the radiant tube cannot be simultaneously reflected, and the highest value of the temperature of the radiant tube cannot be measured if the measuring point is placed in the middle of the radiant tube, so that the condition of actually judging the overtemperature to cause faults, particularly a U-shaped radiant tube and a W-shaped radiant tube, is missed.
The present invention provides a method and an apparatus for controlling the temperature of a heat accumulating type radiant tube.
Fig. 1 is a schematic structural diagram of a temperature control system of a regenerative radiant tube according to an embodiment of the present invention.
It should be noted that the following part of the present invention will be described in detail with reference to the system shown in fig. 1 as an example. Although the following embodiments are illustrated with respect to a radiant tube, it will be understood by those skilled in the art that similar radiant tubes may be configured in a similar manner as follows.
As shown in fig. 1, the system includes: the device comprises an air blower 1, a pressure transmitter 2, an air flow transmitter 3, an air regulating valve 4, an air flue gas reversing four-way valve 5, an ignition fan 6, a gas flow transmitter 7, a gas control valve 8, a gas cut-off valve 9, a heat accumulating type radiation pipe 10, a temperature measuring couple 11, a flue gas regulating valve 12 and an induced draft fan 13.
Specifically, the regenerative radiant tube 10 includes an a burner and a B burner. The air flue gas switching-over cross valve 5 is used for the switching-over, and gas trip valve 9 controls the gas burning. The heat accumulators of the burner A and the burner B are used for accumulating heat, wherein the burner A and the burner B keep burning normally when the radiant tube 10 is in a working state, and ignition flames on two sides can be respectively monitored through the two flame monitors.
Furthermore, a flow sensor and a gas control valve 8 for controlling the supply of gas to the radiant tube 10 can be arranged on the radiant tube gas pipeline, and similarly, a flow sensor and an air regulating valve 4 for controlling the supply of air to the radiant tube 10 are arranged on the air pipeline, so that the purpose of controlling the flow of gas and air for the combustion of the radiant tube is realized by controlling the opening degree of the gas control valve 9 and the air regulating valve 4.
Further, at least three temperature thermocouples 11 may be disposed on the radiant tube 10 to measure the temperature, wherein the temperature may be comprehensively analyzed by simulation and experimental measurement and disposed at a reasonable position on the surface of the radiant tube, as will be described in detail below.
In addition, the radiant tube 10 can be provided with an air pressure sensor, a gas pressure sensor, a flue gas pressure sensor and a flue gas regulating valve 12 for controlling the flue gas pressure, so that the flue gas regulating valve 12 can regulate the pressure of a flue gas pipeline according to the setting, and the combustion position in the radiant tube is ensured to be in the optimal pressure range.
It should be noted that the structure of the radiant tube in fig. 1 is only schematic, and the present invention is not limited to this radiant tube structure.
The method and apparatus for controlling the temperature of a regenerative radiant tube according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 2 is a flowchart of a method for controlling the temperature of a regenerative radiant tube according to an embodiment of the present invention.
As shown in fig. 2, the method for controlling the temperature of the regenerative radiant tube includes the following steps:
in step S201, the temperature of the radiant tube is collected.
The manner of collecting the temperature of the radiant tube can be various, for example, the temperature thermocouple mentioned above measures the temperature, and is not particularly limited.
Wherein, in one embodiment of the present invention, collecting the temperature of the radiant tube further comprises: detecting the temperature of a plurality of temperature detection points on the radiant tube; and if the temperature of the plurality of temperature detection points meets the preset conditions, obtaining the temperature of the radiant tube according to the temperatures of the plurality of temperature detection points and the corresponding preset weight.
It is understood that the temperature of the surface of the radiant tube is not uniform, and in order to better feedback the current state of the radiant tube, the embodiment of the present invention may measure the temperature through a plurality of temperature detection points, wherein the temperature detection points may be arranged at reasonable positions on the surface of the radiant tube, wherein the arrangement positions may be comprehensively analyzed through simulation and experimental actual measurement, and are not particularly limited herein. It should be noted that the preset weight may be set according to actual conditions, for example, the weight may be set to different values according to the radiant tube process, and when there is a temperature thermocouple fault, the weight may be set to 0, so that the influence on the system may be reduced to the minimum.
In addition, if the temperatures detected by the plurality of temperature detection points satisfy a certain condition, a weighted average value is performed, that is, the average calculation cannot be a simple arithmetic average value, and must be a weighted average value; if the temperatures detected by the plurality of temperature detection points do not meet a certain condition, an alarm is given, which will be described in detail below.
Further, in an embodiment of the present invention, the radiant tube includes a first heat storage body and a second heat storage body, wherein the plurality of temperature detection points includes at least a first temperature detection point, a second temperature detection point, and a third temperature detection point, the first temperature detection point is a middle point of the radiant tube, the second temperature detection point is a highest temperature point between the middle point of the radiant tube and the first heat storage body, and the third temperature detection point is a highest temperature point between the middle point of the radiant tube and the second heat storage body.
It will be appreciated that at least three temperature detection points are arranged on the surface of the radiant tube, including the middle point of the radiant tube and the highest temperature point between the two thermal masses and the middle point,
for example, the temperature data collected at the temperature detection points is first processed, such as the measured values of three thermocouples are T1、T2、T3And the weight values of the temperature values measured by the three thermocouples are respectively omega1、ω2、ω3Wherein, ω is1、ω2、ω3Respectively measuring the highest point of the temperature on the left side of the radiant tube, the middle position of the radiant tube and the highest point of the temperature on the right side of the radiant tube. Note that, because of ω1And ω3The position of the radiant tube rising temperature is measured, so that the temperature value is easy to rise and fall, and omega2Relatively stable, so ω2Is higher than omega1And ω3. That is, the temperature of the radiant tube is:
in addition, the radiant tube can be used in the heating furnace as a heating source, so that the temperature of the heating furnace can be collected, the temperature of the heating furnace is also used as an important source to add weight, and the control accuracy is effectively improved.
In step S202, it is determined whether or not the gas is cut off.
It should be noted that, aiming at the reversing characteristic of the heat accumulating type radiant tube, the gas cut-off valve is not opened in a short time before and after the alternation of reversing, the PID integration of the reversing time needs to be treated differently, and the PID integration is not carried out in the time period of not carrying out combustion and unstable combustion, so that the combustion of the radiant tube is kept stable as much as possible.
In step S203, if yes, the opening degrees of the air control valve and the air adjustment valve are controlled proportionally and differentially according to the temperature of the radiant tube and the target temperature.
Further, in one embodiment of the present invention, the proportional, derivative control is performed according to the following equation:
wherein, Tβ＝0For integrating the separation time, and when the gas is cut off, Tβ＝0For the gas control valve off time, β is the integral coefficient, where at Tβ＝0During time β equals 0, otherwise β equals 1, T is the sample time.
That is, when the gas is cut off, the opening degrees of the gas control valve and the air adjustment valve are subjected to proportional, differential control based on the temperature of the radiant tube and the target temperature, but when the gas is not cut off, the opening degrees of the gas control valve and the air adjustment valve are subjected to proportional, differential, integral control, that is, PID control based on the temperature of the radiant tube and the target temperature.
The integral link is introduced into the PID control, mainly for eliminating static difference and improving control precision, but integral separation is carried out when fuel gas is cut off, namely, integral action is cancelled when deviation is large, and integral control is introduced again when controlled quantity is close to a given value so as to reduce static difference. It can be understood that the time-interval integral separation PID algorithm of the embodiment of the present invention specifically is:
wherein, Tβ＝0For integrating the separation time, and when the gas is cut off, Tβ＝0For the gas control valve off time, β is the integral coefficient, where at Tβ＝0During time β equals 0, otherwise β equals 1, T is the sample time.
In the embodiment of the invention, the PID temperature control of the heat accumulating type radiant tube can be correspondingly adjusted according to the characteristic that the radiant tube needs to be frequently reversed, thereby not only meeting the requirement of a heating process, but also not causing the waste of fuel, and simultaneously having the characteristics of reducing fuel consumption, stabilizing the process, improving the product quality, reducing the environmental pollution and the like.
In addition, in an embodiment of the present invention, as shown in fig. 3, after detecting the temperatures of the plurality of temperature detection points on the radiant tube, the control method of an embodiment of the present invention further includes: if the temperature of any one of the temperature detection points is greater than a first preset temperature value, alarming, and if the continuous alarming time is greater than a first preset time value, cutting off the fuel gas; or if the temperature of any one of the plurality of temperature detection points is greater than a second preset temperature value, cutting off the fuel gas, wherein the second preset temperature value is greater than the first preset temperature value; or if the change value of the temperature of the plurality of temperature detection points in the preset time is greater than the preset threshold value, alarming.
As shown in FIG. 3, various alarm protection safeguarding usage safety, i.e., temperature alarm processing, are described in detail herein. It should be noted that the first preset temperature value, the first preset time value, the second preset temperature value and the preset threshold value may be set by those skilled in the art according to actual situations.
For example, a high temperature alarm is set for each temperature detection point. Specifically, when the measured temperature of the radiant tube exceeds a high-temperature alarm set value, an alarm is given immediately, and if the radiant tube works under the working condition for a long time, the condition that the radiant tube is burnt through can occur, so that high-temperature alarm delay time is further set, if the overtemperature alarm duration time exceeds the delay time, the gas stop valve is immediately controlled to cut off gas, so that the heating of the radiant tube is stopped, if only combustion air is switched, the temperature of the radiant tube cannot be continuously raised, and the radiant tube is equivalently in a temperature reduction stage.
For another example, a super high temperature alarm is set for each temperature detection point. Specifically, the ultra-high temperature alarm set value is higher than the high temperature alarm set value, that is, when the measured temperature of the radiant tube exceeds the ultra-high temperature alarm set value, the radiant tube will burn through in a short time, so the heat supply source must be cut off in time, and the gas stop valve is immediately controlled to cut off the gas, so as to stop heating of the radiant tube.
For another example, an instantaneous temperature up/down alarm is set for each temperature detection point. Specifically, if all temperature sensors of the radiant tube are heated and cooled in a very short time, the fact that the inside or the outside of the radiant tube fluctuates greatly is indicated, and an alarm signal is sent out, so that the radiant tube can be judged by an operator and can be processed in the next step.
Also for example, alarms are monitored for various pressures, temperatures, flow overruns, and flames. Specifically, data collected by the data transmitters of pressure, temperature and flow and flame monitoring feedback signals are judged, and if the data exceeds a high limit value or is lower than a low limit value, an alarm signal is sent out, so that different treatments can be carried out according to the alarm type and the possible damage degree.
According to the temperature control method of the heat accumulating type radiant tube, when fuel gas is cut off, the opening degrees of the fuel control valve and the air adjusting valve can be controlled proportionally and differentially according to the temperature of the radiant tube and the target temperature, so that the adverse effect of PID control on a system is eliminated, the control accuracy is improved, the combustion efficiency of the radiant tube is improved, the running stability of the system is effectively ensured, the reliability of equipment is further ensured, the use safety can be ensured, the requirement of a control process is met, the waste of fuel is avoided, the characteristics of reducing fuel consumption, stabilizing the process, improving the product quality, reducing environmental pollution and the like are achieved, the use experience is improved, and the method is simple and easy to implement.
Next, a temperature control apparatus of a regenerative radiant tube according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 4 is a schematic structural diagram of a temperature control device of a regenerative radiant tube according to an embodiment of the present invention.
As shown in fig. 4, the apparatus 100 for controlling the temperature of the regenerative radiant tube includes: the device comprises an acquisition module 101, a judgment module 102 and a control module 103.
Wherein, the collection module 101 is used for collecting the temperature of the radiant tube. The judging module 102 is used for judging whether the gas is cut off. When the gas is cut off, the control module 103 is used for performing proportional and differential control on the opening degrees of the gas control valve and the air regulating valve according to the temperature of the radiant tube and the target temperature. The temperature control device 100 of the embodiment of the invention can eliminate the adverse effect of PID control on the system, improve the control accuracy, improve the combustion efficiency of the radiant tube, effectively ensure the operation stability of the system and further ensure the reliability of the equipment.
Further, in one embodiment of the present invention, the acquisition module 101 includes: a detection unit and an acquisition unit.
The detection unit is used for detecting the temperature of a plurality of temperature detection points on the radiant tube. When the temperature of the plurality of temperature detection points is detected to meet the preset conditions, the obtaining unit is used for obtaining the temperature of the radiant tube according to the temperatures of the plurality of temperature detection points and the corresponding preset weight.
Further, in an embodiment of the present invention, the radiant tube includes a first heat storage body and a second heat storage body, wherein the plurality of temperature detection points includes at least a first temperature detection point, a second temperature detection point, and a third temperature detection point, the first temperature detection point is a middle point of the radiant tube, the second temperature detection point is a highest temperature point between the middle point of the radiant tube and the first heat storage body, and the third temperature detection point is a highest temperature point between the middle point of the radiant tube and the second heat storage body.
Further, in an embodiment of the present invention, the apparatus 100 of an embodiment of the present invention further includes: and an alarm protection module. After the temperature of a plurality of temperature detection points on the radiant tube is detected, when the temperature of any one of the temperature detection points is larger than a first preset temperature value, the alarm protection module is used for giving an alarm, the continuous alarm time is longer than a first preset time value, and the fuel gas is cut off. Or when the temperature of any one of the temperature detection points is greater than a second preset temperature value, the alarm protection module cuts off the fuel gas, wherein the second preset temperature value is greater than the first preset temperature value. Or when the change value of the temperature of the plurality of temperature detection points in the preset time is larger than the preset threshold value, the alarm protection module gives an alarm.
Further, in one embodiment of the present invention, the proportional, derivative control is performed according to the following equation:
wherein, Tβ＝0For integrating the separation time, and when the gas is cut off, Tβ＝0For the gas control valve off time, β is the integral coefficient, where at Tβ＝0During time β equals 0, otherwise β equals 1, T is the sample time.
It should be noted that the foregoing explanation of the embodiment of the method for controlling the temperature of the heat accumulating type radiant tube is also applicable to the temperature control device of the heat accumulating type radiant tube of the embodiment, and is not repeated herein.
According to the temperature control device of the heat accumulating type radiant tube, when fuel gas is cut off, the opening degrees of the fuel control valve and the air adjusting valve can be controlled proportionally and differentially according to the temperature of the radiant tube and the target temperature, so that the adverse effect of PID control on a system is eliminated, the control accuracy is improved, the combustion efficiency of the radiant tube is improved, the running stability of the system is effectively ensured, the reliability of equipment is further ensured, the use safety can be ensured, the requirement of a control process is met, the waste of fuel is avoided, the characteristics of reducing fuel consumption, stabilizing the process, improving the product quality, reducing environmental pollution and the like are achieved, the use experience is improved, and the device is simple and easy to implement.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A temperature control method of a heat accumulating type radiant tube is characterized by comprising the following steps:
collecting the temperature of the radiant tube;
judging whether the fuel gas is cut off or not; and
if yes, the opening degrees of the air control valve and the air regulating valve are controlled proportionally and differentially according to the temperature of the radiant tube and the target temperature.
2. A method of controlling the temperature of a regenerative radiant tube as claimed in claim 1 wherein said collecting the temperature of the radiant tube further comprises:
detecting the temperature of a plurality of temperature detection points on the radiant tube;
and if the temperature of the plurality of temperature detection points is detected to meet the preset condition, obtaining the temperature of the radiant tube according to the temperatures of the plurality of temperature detection points and the corresponding preset weight.
3. A method of temperature control of a regenerative radiant tube as claimed in claim 2 wherein the radiant tube includes a first thermal mass and a second thermal mass, wherein,
the plurality of temperature detection points at least comprise a first temperature detection point, a second temperature detection point and a third temperature detection point, the first temperature detection point is a middle point of the radiant tube, the second temperature detection point is a highest temperature point between the middle point of the radiant tube and the first heat accumulator, and the third temperature detection point is a highest temperature point between the middle point of the radiant tube and the second heat accumulator.
4. A method of controlling the temperature of a regenerative radiant tube as set forth in claim 2, further comprising, after said detecting the temperature of a plurality of temperature detection points on said radiant tube:
if the temperature of any one of the temperature detection points is greater than a first preset temperature value, alarming, and if the continuous alarming time is greater than a first preset time value, cutting off the fuel gas; or,
if the temperature of any one of the temperature detection points is greater than a second preset temperature value, cutting off the fuel gas, wherein the second preset temperature value is greater than the first preset temperature value; or,
and if the change value of the temperature of the plurality of temperature detection points in the preset time is greater than a preset threshold value, alarming.
5. A method of controlling the temperature of a regenerative radiant tube according to any of claims 1 to 4, characterized by proportional and differential control according to the following equations:
wherein, Tβ＝0For integrating the separation time, and when the gas is cut off, Tβ＝0For the gas control valve off time, β is an integral coefficient, where at Tβ＝0During time β equals 0, otherwiseβ equals 1 and T is the sample time.
6. A device for controlling the temperature of a regenerative radiant tube, wherein the method according to any of claims 1 to 5 is used, wherein the device comprises:
the acquisition module is used for acquiring the temperature of the radiant tube;
the judging module is used for judging whether the fuel gas is cut off or not; and
and the control module is used for carrying out proportional and differential control on the opening degrees of the gas control valve and the air regulating valve according to the temperature of the radiant tube and the target temperature when the gas is cut off.
7. A regenerative radiant tube temperature control apparatus as claimed in claim 6 wherein the pickup module comprises:
the detection unit is used for detecting the temperatures of a plurality of temperature detection points on the radiant tube;
and the acquisition unit is used for acquiring the temperature of the radiant tube according to the temperatures of the temperature detection points and the corresponding preset weights when the temperature of the temperature detection points is detected to meet the preset conditions.
8. A regenerative radiant tube temperature control apparatus as claimed in claim 7 wherein the radiant tube includes a first thermal mass and a second thermal mass, wherein,
the plurality of temperature detection points at least comprise a first temperature detection point, a second temperature detection point and a third temperature detection point, the first temperature detection point is a middle point of the radiant tube, the second temperature detection point is a highest temperature point between the middle point of the radiant tube and the first heat accumulator, and the third temperature detection point is a highest temperature point between the middle point of the radiant tube and the second heat accumulator.
9. A regenerative radiant tube temperature control apparatus as claimed in claim 7 further comprising:
the alarm protection module is used for giving an alarm when the temperature of any one of the temperature detection points is greater than a first preset temperature value after the temperature of the temperature detection points on the radiant tube is detected, and cutting off fuel gas when the continuous alarm time is greater than a first preset time value; or when the temperature of any one of the plurality of temperature detection points is greater than a second preset temperature value, cutting off the fuel gas, wherein the second preset temperature value is greater than the first preset temperature value; or when the change value of the temperature of the plurality of temperature detection points in the preset time is larger than the preset threshold value, alarming.
10. A regenerative radiant tube temperature control apparatus as claimed in any of claims 6 to 9 wherein proportional and derivative control is effected according to the following equation:
wherein, Tβ＝0For integrating the separation time, and when the gas is cut off, Tβ＝0For the gas control valve off time, β is an integral coefficient, where at Tβ＝0During time β equals 0, otherwise β equals 1, T is the sample time.
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Cited By (1)
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| TWI696800B (en) * | 2019-04-03 | 2020-06-21 | 大陸商上海頤柏科技股份有限公司 | Temperature control system with fuel gas radiant tube and method thereof |
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