CN110763811A - Ammonia escape grid sampling equipment and detection method - Google Patents

Abstract

The invention provides ammonia escape grid sampling equipment and a detection method. The ammonia escape grid sampling device comprises a sampling system, an ammonia absorption system, a gas path detection system and a liquid path detection system. The ammonia absorption system is filled with absorption liquid for removing ammonia in the gas, and the absorption liquid is converted into sample liquid to be detected after absorbing the ammonia in the gas; the gas path detection system comprises a flowmeter for detecting the flow of the deaminated gas; the liquid path detection system comprises an ammonia analysis device for detecting the ammonia concentration value in the sample liquid to be detected; wherein, the gas circuit detecting system and the liquid circuit detecting system are both communicated with the ammonia absorbing system.

Description

Ammonia escape grid sampling equipment and detection method

technical field

The invention relates to the technical field of air pollution control, in particular to an ammonia escape grid sampling device and a detection method.

Background technique

Domestic _NOx removal technologies mainly include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR), using liquid ammonia, urea or ammonia water as reducing agents. The chemical reaction is that the reducing agent reacts with NO _X in the gas to generate N ₂ and H ₂ O. The common problem between the two is that in the process of gas denitration, escape ammonia is inevitably generated, and the escape ammonia reacts with SO ₃ in the gas. Ammonia hydrogen sulfate is generated, which affects the safe and stable operation of downstream equipment. Ammonia enriched in fly ash will affect the quality of fly ash, and may also be discharged into the atmosphere, causing secondary environmental pollution. Therefore, it is very important to reasonably control the ammonia consumption and closely monitor the ammonia slip concentration when adopting the above-mentioned denitration technology.

With the development of gas detection technology, the methods for ammonia escape detection in denitrification systems at home and abroad are mainly divided into two categories: offline measurement and online monitoring. Offline measurement technologies mainly include chemical analysis, electrochemical analysis and ion chromatography, and online monitoring. The methods mainly include extraction method, laser method and dilution method. However, the site environment of ammonia escape detection is harsh, restricted by dust, humidity, vibration and other conditions, and the deviation of online monitoring data is large. The test results can only be used as a reference for the relative change trend, and the actual ammonia escape concentration detection often relies on manual offline measurement. . The detection method of ammonia escape in gas recommended by my country's national standard is indophenol blue spectrophotometry.

The advantages of the online detection method are good real-time detection data and high data accuracy, but the disadvantages are poor accuracy, inability to calibrate online, and high working conditions; the advantages of the offline detection method are good detection data accuracy and reliable data, but the disadvantages are poor real-time performance and artificial Errors and sample collection are difficult.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides an ammonia escape grid sampling device and a detection method with reliable detection preparation.

The purpose of the present invention is to provide an ammonia escape grid sampling device, including a sampling system, an ammonia absorption system, a gas path detection system and a liquid path detection system. The sampling system arranged in the grid is used to collect the gas to be detected. The ammonia absorption system is connected with the sampling system. The ammonia absorption system contains the absorption liquid used to remove the ammonia in the gas. sample liquid; the gas path detection system includes a flow meter for detecting the flow rate of the deaminated gas; and the liquid path detection system includes an ammonia analysis device for detecting the ammonia concentration value in the sample liquid to be tested; wherein, the gas path detection Both the system and the liquid circuit detection system are communicated with the ammonia absorption system.

Optionally, the ammonia absorption system includes an ammonia absorber and an absorption liquid supply device, the ammonia absorber contains an absorption liquid for removing ammonia in the gas, and the ammonia absorber is communicated with the sampling system, and the absorption liquid absorbs the ammonia in the gas and then converts it into For the sample liquid to be tested, the absorbing liquid supply device communicates with the ammonia absorber for supplementing the absorbing liquid for the ammonia absorber.

Optionally, there are multiple sampling systems, gas path detection systems and ammonia absorbers, and the number of gas path detection systems and ammonia absorbers is determined according to the number of sampling systems. There are switching valves for controlling any one or more of the ammonia absorbers in communication with the ammonia analyzer.

Optionally, the gas path detection system further includes a dryer and an air extraction device, the dryer is respectively connected with the ammonia absorption system and the flow meter, and the air extraction device is used to provide the gas circulation power for the air path detection system.

Optionally, the ammonia analysis device includes a sample liquid cell, a pH adjustment system, and an ammonia gas sensing electrode, the sample liquid cell is in communication with the ammonia absorption system, and the ammonia gas sensing electrode is arranged in the sample liquid cell for detecting the ammonia concentration of the sample liquid to be tested. The liquid supply system includes a pH meter and a liquid supply device. The liquid supply device and the sample liquid pool are connected to adjust the pH value of the sample liquid to be tested. The pH meter is designed in the sample liquid tank to detect the pH value of the sample liquid to be tested.

Optionally, the ammonia escape grid sampling device further includes a control system, and the control system is electrically connected to the gas circuit detection system and the liquid circuit detection system respectively, and is used to calculate the detected gas by using the flow rate of the gas and the ammonia concentration value in the sample liquid to be tested. ammonia concentration.

Optionally, the sampling system includes a sampling gun and a heat tracing tube, and the heat tracing tube is respectively connected with the sampling gun and the ammonia absorption system for heating the gas to be detected.

Optionally, the ammonia escape grid sampling device further includes a flushing device and a waste liquid device, and the flushing device and the waste liquid device are respectively communicated with the ammonia analysis device.

The present invention also provides a detection method, using any of the above-mentioned ammonia escape grid sampling devices, the detection method includes:

The absorption liquid in the ammonia absorption system removes the ammonia in the collected gas, and the absorption liquid absorbs the ammonia in the gas and turns it into the sample liquid to be tested;

Detect the flow rate of the gas after deamination,

Detect the ammonia concentration value in the sample solution to be tested; and

Calculate the ammonia slip concentration value in the gas to be detected.

Optionally, the detection method includes:

The absorbing liquid in the first ammonia absorber removes the ammonia in the collected gas, and the absorbing liquid absorbs the ammonia in the gas and converts it into the first sample liquid to be tested. The ammonia concentration value of the sample liquid, the first sample liquid to be tested is sent to the waste liquid device to supplement the absorption liquid in the first ammonia absorber;

The other ammonia absorbers sequentially absorb the liquid to remove the ammonia in the collected gas, and the absorbing liquid absorbs the ammonia in the gas and turns it into the sample liquid to be tested in turn, and sequentially detects the flow rate of the deaminated gas, and sequentially detects the amount of the sample liquid to be tested. Ammonia concentration value, the sample liquid to be tested is sent to the waste liquid device in turn, and the absorption liquid of other ammonia absorbers is supplemented in turn, and so on.

To sum up, the ammonia escape grid sampling device of the present invention utilizes the chemical absorption principle, and the ammonia absorption system converts the escaped ammonia of the gas to be detected into ammonia in the sample liquid to be tested. Then, the gas flow detection system and the liquid detection system are used to test the flow rate of the gas to be detected and the ammonia concentration value in the sample liquid to be tested. The escaped ammonia concentration in the gas to be detected can be obtained by calculation. The detection system is divided into two channels, so that the moisture in the liquid detection system will not affect the detection results of the gas detection system, and some other gas molecules in the gas detection system will not interfere with the absorption in the liquid detection system. liquid reaction, the results are reliable.

In addition, the detection method of the present invention makes full use of "space for time" to ensure real-time detection data.

Description of drawings

1 is a schematic diagram of an ammonia escape grid sampling device provided in Embodiment 1 of the present invention;

2 is a schematic diagram of a liquid circuit detection system provided by Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a gas path detection system provided in Embodiment 1 of the present invention.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

Example 1

Please refer to Figure 1 to Figure 3. This embodiment provides an ammonia escape grid sampling device, which includes a sampling system 2 arranged in three grids, an ammonia absorption system 5 , a gas path detection system 4 and a liquid path detection system 3 . The sampling system 2 is used to collect the gas to be detected. The ammonia absorption system 5 is connected to the sampling system 2. The ammonia absorption system 5 contains an absorption liquid for removing ammonia in the gas. sample liquid; the gas path detection system 4 includes a flow meter 43 for detecting the flow rate of the deaminated gas; and the liquid path detection system 3 includes an ammonia analysis device 32 for detecting the ammonia concentration value in the sample liquid to be tested; wherein , the gas circuit detection system 4 and the liquid circuit detection system 3 are both communicated with the ammonia absorption system 5 .

The ammonia escape grid sampling device provided in this embodiment utilizes the chemical absorption principle, and the ammonia absorption system 5 converts the escaped ammonia of the gas to be detected into ammonia in the sample liquid to be tested. Then, the gas flow detection system 4 and the liquid circuit detection system 3 are used to test the flow rate of the gas to be detected and the ammonia concentration value in the sample liquid to be tested, respectively. The escaped ammonia concentration in the gas to be detected can be obtained by calculation. The detection system is divided into two channels, so that the moisture in the liquid detection system 3 will not affect the detection results of the gas detection system 4, and some other gas molecules in the gas detection system 4 will not interact with the liquid detection system. The absorption liquid reaction in 3, the result is reliable.

In this embodiment, the ammonia absorption system 5 includes three ammonia absorbers 51 and an absorption liquid supply device 52. The ammonia absorbers 51 contain the absorption liquid for removing ammonia in the gas, and the ammonia absorbers 51 communicate with the sampling system 2. , the absorption liquid absorbs the ammonia in the gas and turns it into a sample liquid to be tested, and the absorption liquid supply device 52 is communicated with the ammonia absorber 51 to supplement the absorption liquid for the ammonia absorber 51 . The main component of the absorption liquid in this embodiment is dilute sulfuric acid with a concentration of 0.0001-0.1 mol/L. The ammonia in the gas dissolves in the absorption liquid to form ammonium ions. The number of ammonia absorbers 51 matches the number of sampling guns 21 .

In this embodiment, the gas path detection system 4 also includes a dryer 44 and an air extraction device. The dryer 44 is communicated with the ammonia absorption system 5 and the flow meter 43 respectively, and the air extraction device is used to provide gas circulation for the air path detection system 4. 's motivation. A stop valve 42 is also provided between the flow meter 43 and the air extraction device. The stop valve 42 is a multi-way stop valve 42 and is installed between the flow meter 43 and the air pump 41 to ensure that the interface of the stop valve 42 covers all gas flow interfaces. The air extraction device is connected to the exhaust end of the ammonia absorber 51. The air extraction device is generally provided with 3 air inlet ports, and the number of air inlet ports matches the number of sampling guns 21, which can meet the requirement of simultaneous air extraction and sampling at multiple grid points. The extracted gas passes through the dryer 44, the flow meter 43 and the air extraction pump 41 in turn. The number of the dryer 44 and the flow meter 43 matches the number of the inlet ports. The gas from the outlets of each flow meter 43 is merged into the air extraction pump 41, and then discharged out and pumped. A plurality of air pumps 41 may be provided.

In this embodiment, the ammonia analysis device 32 includes a sample liquid cell 32-1, a pH adjustment system 33, and an ammonia gas-sensing electrode 32-3. The sample liquid cell 32-1 is in communication with the ammonia absorption system 5, and the ammonia gas-sensing electrode 32 is in communication with the ammonia absorption system 5. -3 is set in the sample liquid pool 32-1 to detect the ammonia concentration value of the sample liquid to be tested, the liquid supply system includes a pH meter 32-2 and a liquid supply device, and the liquid supply device and the sample liquid pool 32-1 are communicated for To adjust the pH value of the sample liquid to be tested, the pH meter 32-2 is set in the sample liquid pool 32-1 to detect the pH value of the sample liquid to be tested. The liquid supply device is provided with alkaline solution, acid solution or buffer solution, and the pH value of the sample solution to be tested can be adjusted to above 11 according to the pH value of the sample solution to be tested. Ammonia gas sensing electrode 32-3 detects ammonia concentration, with high data accuracy, good accuracy, and adjustable measurement range.

In this embodiment, the ammonia escape grid sampling device further includes a control system, and the control system is electrically connected to the gas path detection system 4 and the liquid path detection system 3 respectively for utilizing the flow rate of the gas and the ammonia concentration value in the sample liquid to be tested. Calculate the ammonia concentration of the detected gas. The control system is a PLC-controlled digital display system 8, including modules such as logic control, data feedback, and test result display. PLC precise control, high degree of automation.

In this embodiment, the sampling system 2 includes a sampling gun 21 and a heat tracing pipe 22, and the heat tracing pipe 22 is respectively connected to the sampling gun 21 and the ammonia absorption system 5 for heating the gas to be detected. The sampling gun 21 is made of high-temperature and corrosion-resistant materials, and has a heating function, which can heat the extracted gas to above 150°C. A soot filter is installed at one end of the sampling gun 21 to filter the soot. One end of the sampling gun 21 is connected to the heat tracing pipe 22 , to ensure that the gas entering the ammonia absorber 51 does not condense, and three sampling guns 21 are arranged in this implementation. In other embodiments, the number of sampling guns 21 may be 1, 5, or 20. The number of sampling guns 21 is determined according to the size of the flue section 1, and the number of heat tracing pipes 22 matches the number of sampling guns 21. In this embodiment, there are three gas path detection systems 4 and ammonia absorbers 51. The number of gas path detection systems 4 and ammonia absorbers 51 is determined according to the number of sampling systems 2, and can be the same as the number of sampling systems 2. same. A switching valve 31 is provided between all the ammonia absorbers 51 and the ammonia analysis device 32 for controlling any one or more of the ammonia absorbers 51 to communicate with the ammonia analysis device 32 . The switching valve 31 is a multi-port switching valve 31, which ensures that the interface of the switching valve 31 covers all the sample liquid flow interfaces.

In this embodiment, each ammonia absorber 51 corresponds to one sampling system 2 . However, in other embodiments, every two, every three, etc. any number of ammonia absorbers 51 may also correspond to one sampling system 2 . A flow meter 43 and a shut-off valve 42 are arranged between two or more ammonia absorbers 51 together with the sampling system 2 to control the amount of gas flowing into the two ammonia absorbers 51 to be the same. In this way, multiple detection calculations can be performed on samples collected at a certain location and at a certain time at the same time, thereby increasing the reliability of the detection results.

The sampling guns 21 in this embodiment are arranged in a grid format according to the size of the flue section 1 to be detected, and it is not necessary to manually adjust the position of the sampling gun, and can sample gas at different positions on the flue section. The switching valve 31 and the shut-off valve 42 of the sampling device are controlled by the PLC control digital display system 8. The sampling method is grid point sampling and measurement one by one. The pumping time of each grid point is 3-60 minutes, and the entire flue section has 1 grid point. When the sampling is all completed, the liquid circuit detection system 3 test work will carry out the last grid point sample analysis, so that the sampling work and the analysis work are dislocated and matched, forming a cycle, shortening the detection work time, and sampling at the same time to directly obtain the cross-sectional ammonia escape of the flue. Concentration real-time value and concentration distribution. The pumping time corresponds to the detection and analysis time of each sample. When the analysis and test of the first sample is completed, the second sample is collected and extracted immediately, and so on. Multi-point sampling can be achieved.

In this embodiment, the ammonia escape grid sampling device further includes a flushing device 7 and a waste liquid device 6, and the flushing device 7 and the waste liquid device 6 are respectively communicated with the ammonia analysis device 32 . The flushing device 7 is provided with ammonia-free water, distilled water or other liquids for flushing the ammonia analysis device 32 . The waste liquid device 6 and the sample liquid pool 32-1 are communicated through a waste liquid outlet 32-5 located at the bottom of the sample liquid pool 32-1, and the rinse device 7 and the pH adjustment system 33 are respectively connected through the rinse inlet 32-6 and the pH adjustment liquid inlet. 32-7 communicates with the upper part of the sample liquid pool 32-1. The sample liquid to be tested is communicated with the sample liquid pool 32-1 through the sample liquid inlet 32-4. The waste liquid device 6 is also communicated with the bottom of the ammonia absorber 51 for discharging the waste liquid of the ammonia absorber 51 .

The present invention also provides a detection method, taking three grid sampling points and one air pump 41 as an example. After passing through the filter, the sampling gun 21 and the heat tracing pipe 22 respectively, the 3-way gas enters the corresponding ammonia absorber 51, and the deaminated gas is discharged from the exhaust port of the ammonia absorber 51, and passes through the dryers 44 and 44 of the air extraction device in turn. The flow meter 43 is evacuated by the air pump 41 after the stop valve 42 converges. The entire sampling time lasts 15 minutes, and the 3-way gas volume detection data is transmitted to the PLC-controlled digital display system 8.

After the absorbing liquid in the ammonia absorber 51 absorbs the ammonia in the gas, it is converted into the sample liquid to be tested, and the sample liquid delivery is controlled by the switching valve 31. After 32-1, the pH meter 32-2 detects the pH value of the sample solution, and the data is fed back to the PLC control digital display system 8, and then sends an instruction to the pH adjustment system 33, and the pH adjustment system 33 sends the pH value to the sample solution pool 32-1. Adjust the solution until the pH value of the sample solution rises to above 11. At this time, the ammonia gas sensing electrode 32-3 detects the ammonia concentration value in the sample solution, transmits the data to the PLC-controlled digital display system 8, and then converts and calculates to obtain the first The ammonia concentration in the gas is extracted at each grid point.

After the detection is completed, the waste liquid in the sample liquid pool 32-1 is transported to the waste liquid device 6 through the liquid delivery pipeline system, and then the flushing device 7 is turned on, and the ammonia absorber 51 and the liquid circuit corresponding to the first grid point are flushed at the same time. Detection system 3, after the flushing is completed, the waste liquid in the ammonia absorber 51 and the liquid circuit detection system 3 is transported to the waste liquid device 6 through the liquid conveying pipeline system, and the absorption liquid supply device 52 is activated to send the cleaned ammonia absorber 51 is supplemented with fresh absorption solution (the supplementary volume is generally 50-200 mL). The entire process lasts no more than 3 minutes, and then the sample liquid delivery is controlled by the switching valve 31, and the second and third grid point sample liquid analysis is started in turn, until the detection of the three samples is completed, and the entire process lasts no more than 9 minutes.

When the first grid spotting liquid detection is completed and the second grid spotting sample liquid detection work is started, the second round of sampling of the first grid point is started by controlling the cut-off valve 42, and the sampling time is set as 5min, in this way, when the first round of three sample analysis is completed, the first grid point sampling in the second round has been completed, the second grid point sampling has begun, and the subsequent sampling and analysis work is based on this process. , to realize real-time and cyclic sampling of each grid point. Therefore, the detection method of this implementation makes full use of "space for time" to ensure real-time detection data.

Embodiment 2

This embodiment provides an example of 10 grid sampling points (numbered 1 to 10), 2 air extraction pumps 41, each air extraction pump 41 corresponding to 5 grid sampling points, and divided into A/B two-way air extraction sampling. The present invention will be further described. The detection method of this embodiment includes:

Turn on the power supply, turn on the heating function of the sampling gun 21 and the heat tracing tube 22, and after the temperature rises to the set temperature (160°C), turn on the power supply of the air extraction device, and the sampling starts.

First, turn on the air pump 41 of channel A, and extract 5 channels of gas from the grid sampling points 1 to 5, respectively, after passing through the filter, the sampling gun 21 and the heat tracing pipe 22, and then enter the correspondingly numbered ammonia absorber 51, and the gas after deamination is The ammonia absorber 51 is discharged from the exhaust port, passes through the dryer 44 and the flow meter 43 of the air extraction device in sequence, and is evacuated by the A-channel air pump 41 after being merged by the shut-off valve 42 . The entire sampling time lasts for 30 minutes, and the 5-way gas volume detection data is transmitted to the PLC-controlled digital display system 8. When the sampling system 2 of channel A runs for 15 minutes, the sampling system 2 of channel B starts sampling.

After the absorption liquid in the ammonia absorber 51 corresponding to the sampling system 2 of channel A absorbs the ammonia in the gas, it is converted into the sample liquid to be tested, and the sample liquid delivery is controlled by the switching valve 31. After the sample liquid tank 32-1 of the road detection system 3, the pH meter 32-2 detects the pH value of the sample liquid, and the data is fed back to the PLC control digital display system 8, and then sends an instruction to the pH adjustment system 33, and the pH adjustment system 33 sends the sample to the sample liquid. The lye liquid is transported in the liquid pool 32-1 until the pH value of the sample liquid rises to above 11. At this time, the ammonia gas sensing electrode 32-3 detects the ammonia concentration value in the sample liquid, and transmits the data to the PLC-controlled digital display system 8. Then convert the calculation to obtain the ammonia concentration in the extracted gas at the first grid point.

After the detection is completed, the waste liquid in the sample liquid pool 32-1 is transported to the waste liquid device 6 through the liquid delivery pipeline system, and then the flushing device 7 is turned on, and the ammonia absorber 51 and the liquid circuit corresponding to the first grid point are flushed at the same time. Detection system 3, after the flushing is completed, the waste liquid in the ammonia absorber 51 and the liquid circuit detection system 3 is transported to the waste liquid device 6 through the liquid conveying pipeline system, and the absorption liquid supply device 52 is activated to send the cleaned ammonia absorber 51 is supplemented with fresh absorption solution (the supplementary volume is generally 50-200 mL). The entire process lasts no more than 3 minutes, and then the sample liquid delivery is controlled by the switching valve 31, and the second, third, fourth, and fifth grid point sample liquid analysis is started in sequence, until the five samples are detected. The duration of the process does not exceed 15 minutes.

When the analysis of the 25 samples of the sampling system of the A channel is completed, the sampling of the 25 grid sampling points of the sampling system of the B channel is just finished, and the analysis of the 5 samples of the sampling system 2 of the B channel is started by controlling the switching valve 31 .

When the first grid spotting liquid detection of channel A sampling system 2 is completed and the second grid spotting solution detection work is started, the first step of the second round of channel A sampling system 2 is started by controlling the stop valve 42 at this time. Grid point sampling, the sampling time is set to 15min. In this way, when the first round of 5 samples analysis of channel A sampling system 2 is completed, the first grid point sampling of the second round of channel A sampling system 2 has been completed. The 2nd to 4th grid point sampling work has started. When the second round of sampling of the sampling system 2 of channel A is completed and the first grid spotting liquid analysis is started, the sampling system 2 of channel B starts the second round of sampling. Subsequent sampling and analysis work are carried out based on this process, realizing real-time and cyclic sampling of each grid point.

It should be understood by those skilled in the art that in the disclosure of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore the above terms should not be construed as limiting the invention.

Although the present invention has been disclosed above by preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection shall be subject to the scope of protection required by the claims.

Claims (10)

1. An ammonia escape grid sampling device, comprising:

a grid-arranged sampling system for collecting the gas to be detected,

the ammonia absorption system is communicated with the sampling system, the ammonia absorption system contains absorption liquid for removing ammonia in gas, and the absorption liquid absorbs the ammonia in the gas and then is converted into sample liquid to be detected;

the gas path detection system comprises a flowmeter for detecting the flow of the deaminated gas; and

the liquid path detection system comprises an ammonia analysis device for detecting the ammonia concentration value in the sample liquid to be detected;

the gas path detection system and the liquid path detection system are communicated with the ammonia absorption system.

2. The ammonia escape grid sampling device of claim 1, wherein the ammonia absorption system comprises an ammonia absorber and an absorption liquid supply device, the ammonia absorber contains an absorption liquid for removing ammonia from the gas, the ammonia absorber is communicated with the sampling system, the absorption liquid absorbs ammonia in the gas and then is converted into a sample liquid to be tested, and the absorption liquid supply device is communicated with the ammonia absorber for supplementing the absorption liquid to the ammonia absorber.

3. The ammonia escape grid sampling device of claim 2, wherein there are a plurality of the sampling systems, the gas path detection system and the ammonia absorber, the number of the gas path detection system and the ammonia absorber is determined according to the number of the sampling systems, and a switching valve is provided between all the ammonia absorbers and the ammonia analysis device for controlling any one or more ammonia absorbers to communicate with the ammonia analysis device.

4. The ammonia escape grid sampling device of any one of claims 1 to 3, wherein the gas path detection system further comprises a dryer and an air extractor, the dryer is respectively communicated with the ammonia absorption system and the flow meter, and the air extractor is used for providing gas circulation power for the gas path detection system.

5. The ammonia escape grid sampling device according to any one of claims 1 to 3, wherein the ammonia analyzing device includes a sample liquid tank, a pH adjusting system, and an ammonia gas sensitive electrode, the sample liquid tank is communicated with the ammonia absorbing system, the ammonia gas sensitive electrode is disposed in the sample liquid tank for detecting an ammonia concentration value of a sample liquid to be detected, the liquid supply system includes a pH meter and a liquid supply device, the liquid supply device is communicated with the sample liquid tank for adjusting a pH value of the sample liquid to be detected, and the pH meter is disposed in the sample liquid tank for detecting a pH value of the sample liquid to be detected.

6. The ammonia escape grid sampling device according to any one of claims 1 to 3, further comprising a control system, wherein the control system is electrically connected to the gas path detection system and the liquid path detection system, respectively, for calculating the ammonia concentration of the detected gas by using the flow rate of the gas and the ammonia concentration value in the sample liquid to be detected.

7. The ammonia escape grid sampling apparatus of any of claims 1 to 3 wherein the sampling system comprises a sampling gun and a heat trace tube in communication with the sampling gun and the ammonia absorption system, respectively, for heating the gas to be detected.

8. The ammonia escape grid sampling apparatus of claim 1, further comprising a flushing device and a waste liquid device, the flushing device and the waste liquid device being in communication with the ammonia analysis device, respectively.

9. A detection method using an ammonia escape grid sampling device as defined in any one of claims 1 to 8, the detection method comprising:

removing ammonia in the collected gas by using absorption liquid in an ammonia absorption system, and converting the absorption liquid into sample liquid to be detected after absorbing the ammonia in the gas;

detecting the flow rate of the deaminated gas,

detecting the ammonia concentration value in the sample liquid to be detected; and

and calculating to obtain an ammonia escape concentration value in the gas to be detected.

10. The detection method according to claim 9, characterized in that the detection method comprises:

removing ammonia in the collected gas by using absorption liquid in a first ammonia absorber, converting the absorption liquid into first sample liquid to be detected after absorbing the ammonia in the gas, detecting the flow of the gas after deamination, detecting the ammonia concentration value of the first sample liquid to be detected, sending the first sample liquid to be detected into a waste liquid device, and supplementing the absorption liquid in the first ammonia absorber;

and other ammonia absorbers sequentially absorb liquid to remove ammonia in the collected gas, the absorption liquid absorbs the ammonia in the gas and then sequentially transfers the ammonia into sample liquid to be detected, the flow of the gas after deamination is sequentially detected, the ammonia concentration value of the sample liquid to be detected is sequentially detected, the sample liquid to be detected is sequentially sent into a waste liquid device, the absorption liquid of other ammonia absorbers is sequentially supplemented, and the process is repeated.

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