CN107549299A - A kind of Ethyl formate administration system fumigated for fruit and method - Google Patents

Abstract

The invention provides an ethyl formate dosing system and method for fruit fumigation. The system includes a nitrogen supply unit, an ethyl formate gasification unit, and an ethyl formate dilution mixing release unit; the nitrogen supply unit contains a nitrogen source and a nitrogen outlet; The ethyl formate gasification unit includes a tank with a stainless steel inner wall, which is equipped with a liquid ethyl formate inlet, a nitrogen gas inlet, an ethyl formate gas outlet and a heating module; the ethyl formate dilution mixing release unit includes a stainless steel tank with an explosion-proof design, Equipped with an ethyl formate gas inlet, a circulating air inlet and a mixed gas outlet, the circulating air inlet and the mixed gas outlet are respectively communicated with the fumigation space of the container to be fumigated through pipelines, so that the diluted mixed gas input into the fumigation space, and the air circulation of the fumigation space is input into the stainless steel tank. The system has the advantages of direct use of liquid ethyl formate, rapid gasification, economical use and safe operation.

Description

Ethyl formate dosing system and method for fruit fumigation

technical field

The invention relates to a dosing system and method for fruit fumigation, in particular to an ethyl formate dosing system and method for fruit fumigation, belonging to the field of quarantine.

Background technique

Global economic integration, diversification of international trade forms, and changes in the world's political and economic structure have led to an increase in the frequency of alien pest invasions, seriously threatening my country's ecological environment, agricultural production, and food security. Quarantine treatment is the main technical means and official action for the prevention and control of alien pests commonly used in countries all over the world. According to relevant WTO agreements, exporting countries are obliged to ensure that exported products do not carry harmful organisms of concern to importing countries. Therefore, whether there are effective quarantine treatment measures often becomes the focus of negotiations on international market access for agricultural products, and is also widely used as technical trade measures.

Fresh fruit is the cargo most likely to carry pests, and the risk of quarantine is extremely high. For the quarantine treatment of fruits, methyl bromide fumigation is currently the main method. Since the 1950s and 1960s, developed countries such as Europe and the United States have established quarantine treatment technology and standard systems centered on methyl bromide fumigation. my country also followed up quickly after the 1980s, and combined with the characteristics of China's inbound and outbound trade, established a technical system based on methyl bromide fumigation with Chinese characteristics. Since the beginning of this century, environmental protection and climate change have put forward new technical requirements for quarantine treatment. As an ozone depleting substance controlled by the Montreal Protocol, methyl bromide must be phased out. The international community has carried out a lot of research on methyl bromide substitutes, and the results show that ethyl formate is a promising new fruit fumigant.

Ethyl formate is a naturally occurring substance. Fruits generally contain about 5-10ppm of ethyl formate. At the same time, ethyl formate is easily decomposed into formic acid and ethanol naturally. Therefore, there are generally no residues and food safety problems when using ethyl formate. In fact, ethyl formate has been used as a food additive for nearly 70 years, and the U.S. FDA has also identified ethyl formate as a "generally recognized as safe substance" (GRAS), and there is no need to specify residue limits. Studies in recent years have shown that although ethyl formate has poor penetrating ability to fruits and cannot kill pests inside fruits such as fruit flies, it has a good killing effect on harmful organisms on the surface of fruits such as mealybugs. Generally, the dose of ethyl formate used for fumigation is 40~80g/m ³ , and the fumigation time is 3~6h.

However, fumigation with ethyl formate faces some application problems, mainly:

(1) The boiling point of ethyl formate is generally 53.4-54.4°C, so it is liquid at normal temperature and pressure, and must be vaporized before fumigation. Considering that the fumigation time of ethyl formate is generally short (3-6h), Therefore, it is required that the gasification should be carried out at a relatively fast speed, and the general gasification and dosing time should be controlled within 20 minutes;

(2) Ethyl formate is flammable and explosive. The lower explosion limit of ethyl formate gas in air is 2.7% (v/v), which is about 90g/m ³ .

In order to use ethyl formate safely and effectively for fumigation, some researchers proposed to mix _CO2 and ethyl formate (mass ratio 6:1) in a high-pressure steel cylinder, and use the mixed gas of _CO2 and ethyl formate for fumigation. In this way, there are certain problems in the process of use:

(1) Fumigation is generally carried out in ports (seaports or airports), and the shipment, storage and transportation of high-pressure steel cylinders are inconvenient;

(2) The amount of mixed gas is large and consumed too quickly. Taking general container fumigation as an example, the volume of a 20-foot container is about 33m ³ , based on the dosage of 60g/m ³ , about 2kg of ethyl formate is needed, and a high-pressure steel cylinder can hold 15-18kg of mixed gas, so fumigation of a 20-foot container is One high-pressure steel cylinder is required, which is not economical and increases shipping and storage costs.

(3) Dosing speed is slow. Since the mixed gas of ethyl formate and carbon dioxide is stored in a high-pressure cylinder in liquid form, it is mainly driven by the pressure of its own gasification inside the cylinder to release the cylinder, so it can maintain a relatively fast speed at the initial stage of dosing, but as the internal The dose of medicine is reduced, and a large amount of heat is consumed for gasification during the dosing process. In the later stage of dosing, the temperature of the steel cylinder drops, the internal pressure decays sharply, and the dosing speed is extremely slow.

(4) The local concentration is too high during the administration process. Dosing in the form of mixed gas, the concentration of ethyl formate when entering the container is about 280g/m ³ , much higher than the lowest explosion limit of 90g/m ³ . Of course, due to the presence of a large amount of carbon dioxide in the mixed gas, part of the risk of explosion can be mitigated, but there is still a lack of support from systematic and scientific experimental data.

(5) The price is higher. Taking the commercialized _CO2 and ethyl formate mixed formulation Vapormate as an example, the price of a 20L steel cylinder is about 3,000 RMB, considering that a steel cylinder can only fumigate a 20-foot container (generally, it can hold about 10 tons of fruit) , The cost of chemicals per ton of fruit is as high as 300 yuan.

Therefore, in order to overcome the above problems, there is an urgent need in the art to develop a new ethyl formate dosing system and method for fruit fumigation.

Contents of the invention

In order to solve the problems existing in ethyl formate fumigation, use ethyl formate better, the main purpose of the present invention is to develop a kind of ethyl formate dosing method that is used for fruit fumigation, this method uses dosing system, this system and method have It can directly use liquid ethyl formate, has the advantages of rapid gasification, economical use and safe operation.

Another object of the present invention is to provide an ethyl formate drug delivery system that can be applied to the aforementioned drug delivery methods.

For this reason, the present invention provides a kind of ethyl formate dosing method for fumigation of fruit, described method uses ethyl formate dosing system, and this ethyl formate dosing system comprises nitrogen supply unit, ethyl formate gasification unit and ethyl formate Dilution mixed release unit;

The nitrogen supply unit includes a nitrogen source and a nitrogen outlet;

Described ethyl formate gasification unit comprises the tank body of tool stainless steel inner wall, is provided with liquid ethyl formate inlet, nitrogen gas inlet and ethyl formate gas outlet on this tank body; Described nitrogen gas inlet is vertically towards the bottom of this tank body, It is connected to the nitrogen outlet through a pipeline, and is located above the ethyl formate liquid level during work; the tank body is also provided with a heating module for heating liquid ethyl formate;

The ethyl formate dilution mixing releasing unit comprises the stainless steel tank body with explosion-proof design, is provided with ethyl formate gas inlet, circulating air inlet and mixed gas outlet on this tank body; Described ethyl formate gas inlet passes pipeline and The ethyl formate gas outlet is connected; the circulating air inlet and the mixed gas outlet are respectively communicated with the fumigation space containing the container to be fumigated through pipelines, so that the diluted mixed gas is input into the fumigation space, and The air circulation of the fumigation space is input in the stainless steel tank; the ethyl formate dosing method comprises the following steps:

Open the nitrogen unit to supply nitrogen to the entire ethyl formate dosing system;

Liquid ethyl formate is supplied from the liquid ethyl formate inlet to the tank with stainless steel inner wall, and the liquid ethyl formate is heated by the heating module to make it gasified, and the gasified ethyl formate gas is carried by nitrogen Next, enter the ethyl formate dilution mixing release unit from the ethyl formate gas outlet, then mix and dilute with the air from the fumigation space containing the container to be fumigated, and finally enter the fumigation space from the mixed gas outlet;

Control ethyl formate gas inlet gas volume/circulating air inlet gas volume=1/20, so that the concentration of ethyl formate at the outlet of the mixed gas is 60～80g/m ³ ;

The flow rate of nitrogen supply is controlled at 190-250L/min;

A gas heater for heating nitrogen is also provided on the connecting pipeline between the nitrogen outlet and the nitrogen inlet; the supplied nitrogen is heated by the gas heater, and the power of the gas heater is 1-3Kw, after being heated The nitrogen temperature is 130-150°C.

The reason why the nitrogen inlet of the present invention is vertically towards the bottom of the tank body and is heated is mainly because ethyl formate has explosive characteristics, and is easy to be decomposed into formic acid and ethanol when overheated, thus using a heating plate to heat ethyl formate The power should not be too large. Considering the latent heat of vaporization of ethyl formate is high, the vaporization rate is low in the gasification tank only by heating and boiling on the heating plate, and the temperature difference between the bottom and the upper part of the liquid is large. Therefore, the top purge is added. On the one hand, it can increase the temperature of the upper part of the whole tank and accelerate the gasification; it can also disturb the ethyl formate liquid, increase the molecular activity, and balance the temperature of the upper and lower part of the ethyl formate liquid; in this way, the ethyl formate liquid can be significantly accelerated. Gasification speed and removal speed, so that the gasification and dosing time can be controlled within 20 minutes, without this method, the gasification and dosing time will be extended to more than 40 minutes, resulting in too long dosing time and loss of application value (general fruit fumigation time Only 2 ~ 4h).

As a specific implementation of the above-mentioned ethyl formate dosing method, preferably, an airtight fan is provided on the connecting pipeline between the circulating air inlet or the mixed gas outlet and the fumigation space, so as to accelerate the output of the mixed gas and the circulation of the circulating air. enter.

As a specific implementation of the above ethyl formate dosing method, preferably, the heating module is a ceramic heating element heating module; preferably, it is arranged at the bottom of the tank body with a stainless steel inner wall, and it is equipped with an overheating termination heating module. Design; more preferably, the heat exchange area of the ceramic heating element heating module in contact with liquid ethyl formate is not less than 300cm ² , the heating power is 3-6Kw, and the limit heating temperature is not higher than 180°C.

As a specific implementation of the above ethyl formate dosing method, preferably, the tank body with a stainless steel inner wall is also provided with a residue discharge port.

As a specific implementation of the above ethyl formate dosing method, preferably, the nitrogen inlet is also equipped with a gas flow meter; the ethyl formate gas inlet and the circulating air inlet are respectively equipped with a gas flow meter.

In another aspect, the present invention provides an ethyl formate dosing system for fruit fumigation, wherein the ethyl formate dosing system includes a nitrogen supply unit, an ethyl formate gasification unit and an ethyl formate dilution mixing release unit;

The nitrogen supply unit includes a nitrogen source and a nitrogen outlet;

Described ethyl formate gasification unit comprises the tank body of tool stainless steel inner wall, is provided with liquid ethyl formate inlet, nitrogen gas inlet and ethyl formate gas outlet on this tank body; Described nitrogen gas inlet is vertically towards the bottom of this tank body, It is connected to the nitrogen outlet through a pipeline, and is located above the ethyl formate liquid level during work; the tank body is also provided with a heating module for heating liquid ethyl formate;

The ethyl formate dilution mixing releasing unit comprises the stainless steel tank body with explosion-proof design, is provided with ethyl formate gas inlet, circulating air inlet and mixed gas outlet on this tank body; Described ethyl formate gas inlet passes pipeline and The ethyl formate gas outlet is connected; the circulating air inlet and the mixed gas outlet are respectively communicated with the fumigation space of the container to be fumigated (such as a container) through pipelines (generally connected to the upper and lower parts of the fumigation space respectively) , so that the diluted mixed gas is input into the fumigation space, and the air in the fumigation space is circulated into the stainless steel tank;

A gas heater for heating nitrogen is also provided on the connecting pipeline between the nitrogen outlet and the nitrogen inlet.

The main function of the nitrogen unit of the present invention is to provide nitrogen (industrial nitrogen with a purity of not less than 99.9%) to the system, and use nitrogen as the protective gas and carrying gas to carry the vaporized ethyl formate gas into the mixing tank (stainless steel tank with explosion-proof design).

The main function of the ethyl formate gasification unit of the present invention is to use a heating element to heat the ethyl formate to boiling, so that the liquid ethyl formate is vaporized into ethyl formate gas. In order for nitrogen to carry ethyl formate gas, the aforementioned nitrogen gas inlet needs to be located above the liquid ethyl formate (working liquid level) during operation, so as to take away the boiled and vaporized ethyl formate gas in time, and it needs to be vertical to the bottom of the tank , that is, when working, the heated nitrogen flow is directed towards the liquid surface to help the ethyl formate vaporize.

The main function of the ethyl formate dilution mixing release unit in the present invention is to mix and dilute the mixed gas of nitrogen and ethyl formate quantitatively with the air from the fumigation space in the explosion-proof space, and the ethyl formate gas diluted to a safe concentration enters the fumigation space , to complete the dosing.

As can be seen from above, the present invention is under nitrogen environment, with nitrogen as protection gas, uses heating element to heat ethyl formate to boiling, adopts nitrogen to carry vaporized ethyl formate into premixed tank body (explosion-proof), the nitrogen of entering and The mixed gas of ethyl formate and the air from the fumigation space are mixed and diluted in the explosion-proof space (quantitative mixing is possible), and the ethyl formate gas diluted to a safe concentration (ethyl formate gas below 90g/m ³ ) enters the fumigation space to complete Dosing. The system has the advantages of rapid gasification, economical use, and safe operation, and has great application prospects in fruit fumigation.

As a specific implementation of the aforementioned ethyl formate dosing system, preferably, an airtight fan is provided on the connecting pipeline between the circulating air inlet or the mixed gas outlet and the fumigation space, so as to accelerate the output of the mixed gas and the circulation of the circulating air. enter. The main function of the airtight fan is to send the air in the fumigation space into the dilution and mixing unit, and recirculate it into the container or other fumigation spaces, so as to ensure that the ethyl formate can be evenly distributed in other fumigation spaces of the container during the dosing process.

As a specific embodiment of the aforementioned ethyl formate dosing system, preferably, the nitrogen source includes a nitrogen generator or a nitrogen cylinder.

As a specific embodiment of the aforementioned ethyl formate dosing system, preferably, the heating module is a ceramic heating element heating module (PTC heating module); preferably, it is arranged at the bottom of the tank body with a stainless steel inner wall, and Equipped with an overheating termination heating design; more preferably, the heat exchange area of the ceramic heating element heating module in contact with liquid ethyl formate is not less than 300cm ² , the heating power is 3-6Kw, and the limit heating temperature is not higher than 180°C.

The PTC heating module of the present invention belongs to the prior art. The PTC heating module can prevent unsafe factors caused by overheating, and automatically stop heating when the temperature exceeds 180°C; on the other hand, it can also ensure that all liquid ethyl formate can be vaporized. During the gasification process of ethyl formate, the PTC temperature It can only be heated to about 55°C, the boiling point of ethyl formate. Only after it is completely vaporized, the PTC temperature can rise further, so the PTC temperature can be used to indicate whether the gasification is completely completed.

As a specific implementation of the aforementioned ethyl formate dosing system, preferably, the tank body with a stainless steel inner wall is also provided with a residue discharge port. Setting the residue discharge port can facilitate the discharge of the residue after heating the liquid ethyl formate.

As a specific implementation of the aforementioned ethyl formate dosing system, preferably, the nitrogen inlet is also equipped with a gas flow meter.

As a specific implementation of the aforementioned ethyl formate dosing system, preferably, the ethyl formate gas inlet and the circulating air inlet are respectively equipped with gas flow meters.

In order to facilitate actual control needs, the present invention can also set corresponding valves and flow meters at other positions in the drug delivery system.

The present invention has adopted following means to guarantee safety in the working process:

(1) The present invention uses nitrogen to fill the pipeline in advance before dosing;

(2) PTC heating module with overheating protection design is adopted, and the heating is automatically terminated when the temperature exceeds 180°C.

(3) After the ethyl formate is gasified, it is diluted quantitatively in the explosion-proof space to a safe concentration before entering the fumigation space.

In summary, the present invention provides an ethyl formate dosing system and method for fruit fumigation, which has the ability to directly use liquid ethyl formate, rapid gasification (gasification and dosing time can be controlled within 20min), economical to use and operational safety.

Description of drawings

Fig. 1 is the schematic diagram of the ethyl formate dosing system that is used for fruit fumigation that the embodiment of the present invention 1 provides, and label among the figure has following meaning:

1: nitrogen supply unit; 2: gas heater; 3: nitrogen inlet; 4: liquid ethyl formate inlet; 5: ethyl formate gasification unit; 6: PTC heating module; 7: residue discharge port; 8: ethyl formate Ester gas outlet; 9: ethyl formate dilution mixed release unit; 10: mixed gas outlet; 11: circulating air inlet; 12: airtight fan; 13: container.

detailed description

In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, now in conjunction with specific embodiments and the technical solutions of the present invention are described in detail below, it should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention scope. In the examples, each original reagent material can be obtained commercially, and the experimental methods without specific conditions are conventional methods and conventional conditions well known in the art, or according to the conditions suggested by the instrument manufacturer.

Example 1

The present embodiment provides a kind of ethyl formate dosing system and method for fruit fumigation, please refer to Fig. 1, it is the schematic diagram of this ethyl formate dosing system, it comprises nitrogen supply unit 1, ethyl formate gasification unit 5 and Ethyl formate dilution mixed release unit 9;

Described nitrogen supply unit 1 comprises nitrogen source and nitrogen outlet;

Described ethyl formate gasification unit 5 comprises the tank body of tool stainless steel inner wall, volume is 5L, is provided with liquid ethyl formate inlet 4, nitrogen gas inlet 3, ethyl formate gas outlet 8 and residue discharge port 7 on this tank body ; The nitrogen inlet 3 is vertically towards the bottom of the tank, and it is connected with the nitrogen outlet through a pipeline, above the liquid level of ethyl formate during work; the tank is also provided with a PTC heating for heating liquid ethyl formate Module 6; the PTC heating module 6 is located at the bottom of the tank body with a stainless steel inner wall; the heat exchange area of the PTC heating module 6 in contact with liquid ethyl formate is 350cm ² , the heating power is 3.5Kw, and it is equipped with overheating termination heating Design, the limit heating temperature is 130°C.

Described ethyl formate dilution mix release unit 9 comprises the stainless steel tank body with explosion-proof design, and volume is 100L, is provided with ethyl formate gas inlet, circulating air inlet 11 and mixed gas outlet 10 on this tank body; The ester gas inlet is connected to the ethyl formate gas outlet 8 through a pipeline; the circulating air inlet 11 and the mixed gas outlet 10 are respectively communicated with the fumigation space of the container 13 through a pipeline, so that the diluted mixed gas is input to the fumigation space, and to circulate air from the fumigation space into the stainless steel tank;

An airtight fan 12 is provided on the connecting pipeline between the mixed gas outlet 10 and the fumigation space to accelerate the output of the mixed gas and the input of circulating air;

A gas heater 2 for heating nitrogen is also provided on the connecting pipeline between the nitrogen outlet and the nitrogen inlet 3; the nitrogen source is a nitrogen cylinder;

The nitrogen gas inlet 3, the ethyl formate gas inlet and the circulating air inlet 11 are respectively equipped with gas flow meters (not shown in the figure).

There are also valves to control the entry and exit of materials at the above-mentioned inlets or outlets.

The method for applying the aforementioned ethyl formate dosing system may further comprise the steps:

Open the nitrogen unit to supply nitrogen to the entire ethyl formate dosing system;

From the liquid ethyl formate inlet 4, 3L liquid ethyl formate is supplied to the tank with stainless steel inner wall, and the liquid ethyl formate is heated by the PTC heating module 6 to make it gasified, and the gasified ethyl formate gas Enter the ethyl formate dilution mixing release unit 9 from the ethyl formate gas outlet 8 under the carrying of nitrogen, then mix and dilute with the air from the fumigation space of the container 13, and finally enter the fumigation from the mixed gas outlet 10 space.

The flow rate of the supplied nitrogen is controlled at 200 L/min by a gas flow meter, and the supplied nitrogen is heated by a gas heater 2 whose power is 1.5Kw, and the temperature of the heated nitrogen is 135°C.

Within 10 min, the vaporization of liquid ethyl formate was complete.

Control ethyl formate gas inlet gas volume/circulating air inlet gas volume=1/20, and the concentration of ethyl formate at the outlet 10 of the mixed gas is detected to be 65g/m ³ . The detection of the concentration of ethyl formate was carried out using a gas chromatograph equipped with a flame ionization detector (FID), and the concentration of ethyl formate in the sample was calculated by the external standard method. First dilute 200g/m ³ ethyl formate standard gas to different concentrations, draw a standard curve, and then calculate the exact concentration of ethyl formate in the sample according to the standard curve. Gas chromatography conditions: inlet temperature: 220°C, packed column Propark Q (80-100 mesh), column temperature: 80°C, FID: 250°C, carrier gas: H ₂ , N ₂ , column flow: 40mL/min , Reference gas flow: 50mL/min.

Comparative example 1

This comparative example is basically the same as in Example 1, except that the nitrogen inlet is horizontally oriented, and the nitrogen is not heated, and it is operated in the same manner as in Example 1. Experiments show that the same volume of ethyl formate needs 40 minutes to be vaporized complete. This greatly prolongs the dosing time.

Finally, it is explained that the above examples are only used to illustrate the implementation process and characteristics of the present invention, rather than limiting the technical solution of the present invention. Although the present invention has been described in detail with reference to the above examples, those of ordinary skill in the art should understand that: The present invention can still be modified or equivalently replaced, and any modification or partial replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the present invention.

Claims (10)

1. a kind of Ethyl formate medication administration method fumigated for fruit, methods described use Ethyl formate administration system, the formic acid Ethyl ester administration system includes nitrogen supply (NS) unit, Ethyl formate gasification unit and Ethyl formate dilution mixing releasing unit；

The nitrogen supply (NS) unit includes source nitrogen and nitrogen outlet；

The Ethyl formate gasification unit includes the tank body of tool stainless steel inwall, enters on the tank body provided with liquid Ethyl formate Mouth, nitrogen inlet and Ethyl formate gas vent；The bottom of the nitrogen inlet vertically tank body, it passes through pipeline and institute State nitrogen outlet to be connected, Ethyl formate ullage during positioned at work；The tank body is additionally provided with for heating liquid Ethyl formate Heating module；

The Ethyl formate dilution mixing releasing unit includes the stainless steel tank body with Explosion-proof Design, and first is provided with the tank body Acetoacetic ester gas feed, circulation air import and mixed gas outlet；The Ethyl formate gas feed by pipeline with it is described Ethyl formate gas vent is connected；The circulation air import and the mixed gas outlet by pipeline and hold thing to be fumigated respectively The stifling space connection of container, the mixed mixed gas of the dilution is input to the stifling space, and this is fumigated into space Air circulation input in the stainless cylinder of steel body；The Ethyl formate medication administration method comprises the following steps：

Open nitrogen unit the supply of nitrogen into the whole Ethyl formate administration system；

Liquid Ethyl formate is supplied into the tank body of the tool stainless steel inwall from the liquid Ethyl formate import, by described Heating module heating liquid Ethyl formate is vaporized, and the Ethyl formate gas after gasification is under the carrying of nitrogen from the formic acid Ethyl ester gas vent enters Ethyl formate dilution mixing releasing unit, then holds the smoked of thing container to be fumigated with coming from The air mixed diluting in space is steamed, finally enters stifling space from the mixed gas outlet；

Control Ethyl formate gas feed tolerance/circulation air import tolerance=1/20 so that the mixed gas outlet formic acid The concentration of ethyl ester is in 60~80g/m³；

The flow control of the supply of nitrogen is in 190~250L/min；

The gas heater for heated nitrogen is additionally provided with the nitrogen outlet and the connecting line of the nitrogen inlet；For The nitrogen answered heats through the gas heater, and the power of the gas heater is 1~3Kw, the nitrogen temperature 130 after being heated ~150 DEG C.

2. Ethyl formate medication administration method according to claim 1, wherein, go out in the circulation air import or mixed gas Mouthful and the connecting line in the stifling space be provided with closed blower fan, to accelerate the defeated of the output of mixed gas and circulation air Enter.

3. Ethyl formate medication administration method according to claim 1, wherein, the heating module heats for ceramic heating element Module；Preferably, it is located at the bottom of the tank body of the tool stainless steel inwall, and it is equipped with overheat termination heating design；More preferably Ground, the heat exchange area that the ceramic heating element heating module contacts with liquid Ethyl formate are not less than 300cm², heating power 3 ~6Kw, limit heating-up temperature are not higher than 180 DEG C.

4. Ethyl formate medication administration method according to claim 1, wherein, the tank body for having stainless steel inwall is additionally provided with residual Slag floss hole.

5. Ethyl formate medication administration method according to claim 1, wherein, the nitrogen inlet is also equipped with gas flowmeter； The Ethyl formate gas feed and the circulation air import are respectively provided with gas flowmeter.

6. a kind of Ethyl formate administration system fumigated for fruit, wherein, the Ethyl formate administration system includes nitrogen supply (NS) Unit, Ethyl formate gasification unit and Ethyl formate dilution mixing releasing unit；

The nitrogen supply (NS) unit includes source nitrogen and nitrogen outlet；

The Ethyl formate gasification unit includes the tank body of tool stainless steel inwall, enters on the tank body provided with liquid Ethyl formate Mouth, nitrogen inlet and Ethyl formate gas vent；The bottom of the nitrogen inlet vertically tank body, it passes through pipeline and institute State nitrogen outlet to be connected, Ethyl formate ullage during positioned at work；The tank body is additionally provided with for heating liquid Ethyl formate Heating module；

The Ethyl formate dilution mixing releasing unit includes the stainless steel tank body with Explosion-proof Design, and first is provided with the tank body Acetoacetic ester gas feed, circulation air import and mixed gas outlet；The Ethyl formate gas feed by pipeline with it is described Ethyl formate gas vent is connected；The circulation air import and the mixed gas outlet by pipeline and hold thing to be fumigated respectively The stifling space connection of container, the mixed mixed gas of the dilution is input to the stifling space, and this is fumigated into space Air circulation input in the stainless cylinder of steel body；

The gas heater for heated nitrogen is additionally provided with the nitrogen outlet and the connecting line of the nitrogen inlet；

Preferably, the nitrogen inlet is also equipped with gas flowmeter；

Preferably, the Ethyl formate gas feed and the circulation air import are respectively provided with gas flowmeter.

7. the Ethyl formate administration system according to claim 6 fumigated for fruit, wherein, the source nitrogen includes system Nitrogen machine or nitrogen cylinder.

8. the Ethyl formate administration system according to claim 6 fumigated for fruit, wherein, the tool stainless steel inwall Tank body be additionally provided with residue floss hole.

9. the Ethyl formate administration system according to claim 6 fumigated for fruit, wherein, enter in the circulation air Mouthful or the connecting line in mixed gas outlet and the stifling space be provided with closed blower fan, with accelerate the output of mixed gas and The input of circulation air.

10. the Ethyl formate administration system according to claim 9 fumigated for fruit, wherein, the heating module is Ceramic heating element heating module；Preferably, it is located at the bottom of the tank body of the tool stainless steel inwall, and it is equipped with overheat termination Heating design；It is highly preferred that the ceramic heating element heating module is not less than with the heat exchange area that liquid Ethyl formate contacts 300cm², heating power is 3~6Kw, and limit heating-up temperature is not higher than 180 DEG C.