CN109781943A - Greenhouse gas emissions automatic detection device and system and method - Google Patents

Greenhouse gas emissions automatic detection device and system and method Download PDF

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Publication number
CN109781943A
CN109781943A CN201811623515.1A CN201811623515A CN109781943A CN 109781943 A CN109781943 A CN 109781943A CN 201811623515 A CN201811623515 A CN 201811623515A CN 109781943 A CN109781943 A CN 109781943A
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module
case lid
greenhouse gas
greenhouse
cabinet
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孙宇瑞
单桂林
程强
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China Agricultural University
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China Agricultural University
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Abstract

The present invention relates to gases to discharge detection field, disclose a kind of greenhouse gas emissions automatic detection device and system and method, which includes: cabinet, and the greenhouse gases that measurand discharges are entered in the inner cavity of cabinet by cabinet inlet end;The top of the open end is arranged in case lid;Drive module connect with case lid and can drive case lid open or close open end;Gas detection module is arranged in the inner cavity of cabinet, for detecting gas concentration in inner cavity;Control module, when output first control signal to drive module drives case lid lid to close at open end, second control signal is exported to gas detection module, to promote gas detection module real-time detection inner cavity percent of greenhouse gases concentration within a preset time, and the gas concentration data feedback that will test to control module carries out data processing.A kind of greenhouse gas emissions automatic detection device and system and method provided by the invention quick, in situ, online, continuously can measure gas emissions.

Description

Greenhouse gas emissions automatic detection device and system and method
Technical field
The present invention relates to gases to discharge detection field, more particularly to a kind of greenhouse gas emissions automatic detection device and System and method.
Background technique
Since the industrial revolution, influence of the mankind's activity to biosphere expands in the whole world, especially atmosphere from region Carbon dioxide, methane, nitrous oxide and chlorofluorocarbons isothermal chamber gas concentration be increasing year by year always.The greenhouse effect got worse Climate warming caused by problem is answered to have become the important restriction factor of global economy, social sustainable development.Implementing to hold In continuous development strategy, the emission reduction of greenhouse gases is undoubtedly core link.Correctly, all kinds of terrestrial ecosystems are objectively evaluated to big The contribution that main greenhouse gas concentration changes in gas is important interior in Present Global variation and global climate, Study of Environmental Changes Hold, and carrying out in-site measurement to the feature of all kinds of ecosystem emission greenhouse gases is the main means for completing this evaluation.
Currently, the method for measurement terrestrial ecosystems greenhouse gas emission both at home and abroad is mainly case method (including closed chamber method With dynamic case method) and microclimate method (including Chamber technique, gradient method, mass balance approach, energy budget method etc.).Closed chamber method Simple and easy, operation is easy, mobile convenient but its natural environment state for destroying measurand, the turbulence state in case with And temperature, humidity, illumination, radiation position etc. can change, and then affect the authenticity of measurement result to a certain extent. Dynamic case method changes destruction of the cabinet to measurand natural environment to a certain extent, so that measurement result is closer to really Value.But dynamic case method is more demanding to design and the measurement accuracy aspect of cabinet airflow balancing, receives it in practical applications To limitation.Compared with case method, microclimate method is a kind of open measurement method, is primarily adapted for use in large scale even macroscopic Region.Normal open amount layer is the fundamental prerequisite of micrometeorology method (in addition to mass balance approach) measurement gas flux, and in reality In this condition tend not to be met.Mass balance approach measurement is complicated, not only requires accurately to measure originally just very low Tested gas concentration and its background concentration in the area difference, but also to measure respectively tested gas be in the wind direction and under The concentration profile in wind direction.In addition to this, expensive equipment, mobile difficult, sensitivity is low etc., and reasons are also that microclimate method cannot be wide The reason of general application.
Summary of the invention
(1) technical problems to be solved
The purpose of the present invention is to solve existing greenhouse gas emissions measuring devices and calculation method there is disturbance quilt The technical problem for surveying object, measurement result inaccuracy, provide a kind of greenhouse gas emissions automatic detection device and system and its Method.
(2) technical solution
For the technical problems in the prior art, in a first aspect, the present invention provide a kind of greenhouse gas emissions from Motion detection device, the device include:
Cabinet, upper end are open end;Lower end is inlet end, and the greenhouse gases of measurand release enter through the inlet end In the inner cavity of the cabinet;
The top of the open end is arranged in case lid;
Drive module connect with the case lid and can drive open end described in the case lid open or close;
Gas detection module is arranged in the inner cavity of the cabinet, for detecting the greenhouse gas concentration in inner cavity;
Control module exports first control signal to the drive module, drives the case lid by the drive module When closing at the open end, the control module exports second control signal to the gas detection module, described in promoting Gas detection module detects the greenhouse gas concentration in the inner cavity in real time within a preset time, and the greenhouse gas that will test Bulk concentration data feedback to the control module carries out data processing to obtain the discharge amount of greenhouse gases.
Second aspect, the present invention provide a kind of greenhouse gas emissions automatic checkout system, which includes: described above Greenhouse gas emissions automatic detection device, the open end is configured in the upper end of the cabinet, at the bottom of the cabinet End is equipped with bottom cover, and the bottom cover is equipped with several air inlets.
The third aspect, the present invention provide a kind of greenhouse gas emissions automatic testing method, utilize greenhouse described above Gas emissions automatic checkout system, this method include
Control module exports first control signal to drive module, and the case lid lid is driven to close the opening in the cabinet End;
Control module exports second control signal to the gas detection module, detects when case lid lid closes in corresponding cabinet Greenhouse gas concentration in chamber, and feed back in the control module;
After reaching preset time, to the gas detection module, detection is the control module output third control signal Greenhouse gas concentration when will be unpacking in cabinets cavity, and feed back in the control module;
The 4th control signal of control module output drives the case lid to be opened to drive module;
Greenhouse gas concentration when control module is closed according to case lid lid and when case lid is opened in corresponding cabinets cavity, into The discharge amount of row data processing acquisition greenhouse gases.
(3) beneficial effect
A kind of greenhouse gas emissions automatic detection device and system and method provided by the invention, can be according to actual measurement The closing time of cabinet and the sampling period of gas detection module are adjusted, the mesh for not destroying measurand local environment is reached , guarantee the accuracy of measurement structure, there is wide applicability, while whole process automation control, avoid manual operation, Improve the confidence level and reliability of measurement result;Detection device of the invention is easy to operate, can quickly, in situ, online, even It is continuous that gas emissions are measured.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of greenhouse gas emissions automatic detection device of the present invention.
Wherein:
Cabinet 1, case lid 2, gas detection module 3, control module 4, drive module 5, bottom cover 6, carbon dioxide sensor 31, Methane transducer 32, cylinder 51, air pump 52, reversing solenoid valve 53.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Following instance For illustrating the present invention, but it is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected;It can To be mechanical connection, it is also possible to be electrically connected;It can be directly connected, can also can be indirectly connected through an intermediary Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition Concrete meaning in invention.
Fig. 1 gives the structural schematic diagram of one embodiment of greenhouse gas emissions automatic detection device of the present invention, the device It include: cabinet 1, case lid 2, gas detection module 3, control module 4 and drive module 5.Wherein:
Cabinet 1 is a kind of shell with inner cavity, and shape can be cylindrical body, cuboid etc., and the upper end is open end, is made The inner cavity of cabinet 1 is connected to external environment.Cabinet lower end is inlet end, is entered in cabinet 1 for detected greenhouse gases In chamber, the top of the preferred cabinet 1 of the present embodiment is open end, bottom and measurand closing contact.In detection measurand institute When the discharge amount of the greenhouse gases of release, measurand is placed on to the inlet end of cabinet 1, the gas of measurand release by into Gas end, which enters in the inner cavity of cabinet 1, to be detected.
Case lid 2 is used to block the open end of cabinet 1, and size is adapted with the open end size of cabinet 1, and the present embodiment is excellent The inside of case lid 2 and 1 open end of cabinet is selected to be interference fitted.Case lid 2 is driven right above the open end of cabinet 1 by drive module 5 It is up and down, so that case lid 2 is moved downward lid and close at open end, moves upwards opening;The lid of case lid 2 is closed cabinet at open end Environment is isolated with external environment in 1 inner cavity, and greenhouse gases are retained in the lumen, convenient for the detection of gas content.
Drive module 5 can be used skilled person will appreciate that the driving device for driving object up and down, such as rise Drop machine etc..A kind of specific structure of drive module 5 is provided in another embodiment, as shown in Figure 1, the drive module 5 includes: Cylinder 51 and air pump 52.There is piston rod, by piston rod driven object object, case lid 2 is fixed on the piston rod in cylinder 51 End and be suspended at the surface of 1 open end of cabinet, driven and moved up and down by piston rod;Air pump 52 passes through pipeline and cylinder 51 Connection, the input air pressure into cylinder 51 provide the driving force of piston rod by air pressure.Further, which further includes changing To solenoid valve 53, reversing solenoid valve 53 is a kind of valving of changeable air pressure commutation, can be controlled by automatically controlled, this reality It applies example to be controlled using control module 4, reversing solenoid valve 53 is mounted on the access of air pump 52 and cylinder 51, control module 4 First control signal is exported, which is positive control signal, after reversing solenoid valve 53 receives positive control signal It controls air pump 52 and exports positive air pressure power, drive case lid 2 to be moved downward to and closed with the open end cap of cabinet 1, control module 4 is defeated 4th control signal out, the 4th control signal is reverse control signal, and reversing solenoid valve 53 is controlled after receiving reverse control signal Air pump 52 processed exports reversed Pneumatic pressure power, and case lid 2 is driven to move up opening.
Gas detection module 3 is arranged in the inner cavity of cabinet 1, can be placed in the inside bottom of cabinet 1, or passes through support In the lumen, gas detection module 3 is used to detect the concentration of the greenhouse gases entered in inner cavity, generallys use gas for frame support suspension Body sensor is detected, for example, carbon dioxide sensor 31, methane transducer 32 etc., it is dense to detect carbon dioxide, methane respectively Degree, or the two concentration is detected simultaneously.In addition, gas sensor can select different according to the object gas of required detection Sensor is suitable for the measurement of other gases discharge by replacement sensor type, increases the application range of the device.
Control module 4 is used to carry out whole device electric control operation, signal transmitting and data processing, the embodiment of the present invention and adopts With skilled person will appreciate that the controller for being able to carry out Software Coding, such as single-chip microcontroller etc..Control module 4 respectively with drive Dynamic model block 5 and gas detection module 3 are electrically connected, and control module 4 exports first control signal, the 4th control signal to driving respectively Module 5, so that drive module 5 drives case lid 2 to execute lid conjunction, opening operation, control module 4 exports second control signal and third It controls signal to gas detection module 3 and starts the acquisition greenhouse gas concentration information of gas detection module 3.
Control module 4 executes following operation by coded program, and control module 4 exports first control signal to driving mould Block 5 executes 2 lid closing operation of case lid, exports second control signal and third controls signal to gas detection module 3, the inspection of order gas Module 3 is surveyed in preset time t0Interior real-time detection inner cavity percent of greenhouse gases concentration, the gas that gas detection module 3 will test are dense Degree factually when feed back to control module 4, control module 4 carries out data processing, number according to the greenhouse gas concentration data of acquisition According to the discharge amount for obtaining greenhouse gases after analysis.
Wherein, preset time t0The time of variation is not generated for 1 internal environment parameter of cabinet, namely is not destroyed in cabinet 1 The time of environment in chamber, which includes pressure in inner cavity, humidity etc., in the period that environmental parameter is not generated to variation The greenhouse gas concentration data of acquisition, which are transmitted in control module 4, carries out data processing, or when environmental parameter generates variation The detection for stopping gas detection module 3 immediately carries out data processing according to the partial data.Those skilled in the art can be passed through Pressure, humidity etc. are in the inner cavity of known detection device real-time detection cabinet 1 to obtain the variation of each environmental parameter.
Preset time t0It can be adjusted according to actual measurement, applied widely, the present invention is obtained by experimental study, in advance If time t0It is more preferably 2-3min, which will not generate variation.Do not destroying 1 inner cavity of cabinet The preset time t of middle environment0Interior progress gas concentration detection can reach to avoid the interference of environmental factor and not destroy tested pair As the purpose of locating environment, guarantee the accuracy and confidence level of data.
A kind of specific structure of control module 4 is provided in another embodiment, which includes: timing module And micro treatment module.Timing module reaches the first preset time ta, the second preset time t0Afterwards respectively output standby signal to micro- Processing module;Wherein, taIt is that case lid extremely covers the time closed, the second preset time t by0Being will to case lid after case lid lid closes The time of unlatching, with preset time t described above0It is equivalent.
Micro treatment module uses skilled person will appreciate that the controller of Software Coding can be carried out, such as single-chip microcontroller etc., Micro treatment module output control command notice timing module starts timing, when the arrival first for receiving timing module sending is preset Between taStandby signal when, micro treatment module export first control signal to drive module 5 execute 2 lid closing operation of case lid, simultaneously Second control signal is exported to gas detection module 3, the detection of gas detection module 3 is promoted to reach the first preset time taIt is corresponding Greenhouse gas concentration in inner cavity, and by the greenhouse gas concentration data feedback into micro treatment module, timing module continues to count When, reach the second preset time t0, micro treatment module, which receives, reaches the second preset time t0Standby signal, micro treatment module is defeated Third control signal promotes the detection of gas detection module 3 to reach the second preset time t out0Greenhouse gases in corresponding inner cavity are dense Degree, and by the greenhouse gas concentration data feedback into micro treatment module, micro treatment module is according to the first preset time taAnd Second preset time t0Greenhouse gas concentration in corresponding inner cavity carries out data processing, to obtain the discharge amount of greenhouse gases.
Further, the also exportable 4th control signal of micro treatment module to drive module 5 executes 2 opening operation of case lid.
First preset time t described aboveaPreferably 28-30min, the second preset time t0Preferably 2-3min.First Preset time taIt covers case lid 2 again afterwards to be detected, in t0Short time period in only generate the variation of gas concentration, thus not shadow Measurand internal environment is rung, can be improved the accuracy of detection data.Reach the second preset time t0Case lid 2 is opened afterwards, It comes into full contact with measurand with outside air, is not destroyed with the environment for guaranteeing locating in cabinet 1.
A kind of greenhouse gas emissions automatic detection device provided in an embodiment of the present invention, can be according to actual measurement adjusting tank The closing time of body 1 and the sampling period of gas detection module 3 achieve the purpose that not destroy measurand local environment, protect The accuracy of measurement structure is demonstrate,proved, there is wide applicability, while whole process automation control, avoid manual operation, improve The confidence level and reliability of measurement result;Detection device of the invention is easy to operate, can be quick, in situ, online, continuous right Gas emissions measure.
The present invention also provides a kind of greenhouse gas emissions automatic checkout system, which includes the various embodiments described above institute The greenhouse gas emissions automatic detection device stated, specific structure is as described above, details are not described herein.Wherein, in cabinet 1 Upper end is configured with the open end, is equipped with bottom cover 6 in the bottom end of cabinet 1, bottom cover 6 is equipped with several air inlets.The bottom cover 6 can Edge is designed, for covering the container for closing and container being made to form sealing in arbitrary container.Test sample container can be cooperated to use, be applicable in Range is wide.
Further, system further include: test sample container.Bottom cover 6 removably covers the top opening closed in test sample container Place forms sealing container, and the inner cavity of cabinet 1 passes through the air inlet being arranged on bottom cover 6 and is connected to the inner cavity of test sample container, bottom cover 6 may be designed to intermediate hollow out, the lid-like with edge, and the structure of hollow out can carry out abundant with measurand in test sample container Contact rapidly enters the greenhouse gases of release in 1 inner cavity of cabinet, and the borderline structure that bottom cover 6 designs can be adapted for most appearances Device, it is applied widely.In order to improve sealing performance, in the also settable seal washer of the top open part of test sample container.Tested pair As being placed in test sample container, discharge greenhouse gases in the container of sealing, can further decrease interference in greenhouse gases because Element improves the accuracy of measurement result.
The present invention also provides a kind of greenhouse gas emissions automatic testing method, this method is based on the various embodiments described above The greenhouse gas emissions automatic checkout system, comprising:
Control module 4 exports first control signal to drive module 5, and the lid of case lid 2 is driven to close in the open end of cabinet 1;
Control module 4 exports second control signal to gas detection module 3, detects when the lid of case lid 2 closes in corresponding cabinet 1 Greenhouse gas concentration c in chamber1, and feed back in control module 4;
Reach preset time t0Afterwards, control module 4 exports third and controls signal to gas detection module 3, and detecting case lid is By the greenhouse gas concentration c in 1 inner cavity of cabinet corresponding when opening2, and feed back in control module 4;At the same time, mould is controlled The 4th control signal of the output of block 4 drives case lid 2 to be opened to drive module 5;
Greenhouse gas concentration when control module 4 is closed according to case lid lid and when case lid is opened in corresponding cabinets cavity c1、c2, carry out the discharge amount that data processing obtains greenhouse gases.
Wherein, the above process can be again continued to after a certain time after the opening of case lid 2 to take multiple measurements, to reach company The purpose of continuous on-line checking.
In the above process, control module 4 can obtain greenhouse according to following calculation formula during carrying out data processing The discharge amount J of gas:
J=(c2-c1)/(S·t0)
Wherein, J is greenhouse gas emission flux, unit mol/m2H (molar concentration of unit area in per hour);S For the area of section of 1 inner cavity of cabinet, unit m2;c1The greenhouse gas concentration detected when covering and close for case lid 2, unit mol; c2For t0The greenhouse gas concentration detected after time, unit mol;t0For 2 closing time of case lid, unit h.
Below for measuring ensilage CO2 emissions under indoor environment, further to detection side of the invention Method is described in detail.
(1) ensilage is placed in 60L (diameter:, will 35.7cm high: 60cm) in test sample container according to certain bulk density first The bottom cover 6 of 1 bottom of cabinet is mounted on test sample container and is sealed, and bottom cover 6 is fixed using snap ring.
(2) by timing module preset time taIt is set as 28min, t0It is set as 2min, i.e. case lid 2 is spaced 28min and closes 2min controls carbon dioxide sensor 31 by micro treatment module in the period and carries out real-time sampling.
(3) when reaching 28min, micro treatment module sends signal to reversing solenoid valve 53, and reversing solenoid valve 53 utilizes gas The pressure control cylinder 51 that pump 52 provides carries out extending actions, and case lid 2 moves down, with the open end in contact of certain pressure and cabinet 1, Seal washer makes cavity inner cavity form air-proof condition at cavity open end.At this time micro treatment module to carbon dioxide sensor 31 into Row signal acquisition.After 2min, micro treatment module retracts case lid 2 by reversing solenoid valve 53 and cylinder 51, is back to original position, Cabinet 1 is open at this time, and measurand is come into full contact with air, does not destroy its local environment.
(4) for sensing data collected (by 2min generate 0.002mol carbon dioxide for, i.e. c2-c1= 0.002mol), micro treatment module is according to the following discharge amount J for calculating acquisition greenhouse gases:
J=(c2-c1)/(S·t0)=0.002/ [(3.14 × 0.1792) × 2/60]=0.596mol/m2h。
During calculating, to make calculated result more accurate, can in 2min according to the sensor response time into Row multiple repairing weld optimizes generation amount of carbon dioxide in the unit time using multiple repairing weld result.
(5) finally, micro treatment module by handled as the result is shown on display and storing.Case lid 2 can be again after opening Continue to measure after 28min, aforesaid operations is repeated, to achieve the purpose that continuous on-line detection.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of greenhouse gas emissions automatic detection device characterized by comprising
Cabinet, upper end are open-mouth section;Lower end is inlet end, and the greenhouse gases of measurand release are through described in inlet end entrance In the inner cavity of cabinet;
The top of the open end is arranged in case lid;
Drive module connect with the case lid and can drive open end described in the case lid open or close;
Gas detection module is arranged in the inner cavity of the cabinet, for detecting the greenhouse gas concentration in inner cavity;
Control module, output first control signal to the drive module drive the case lid to close by the drive module When at the open end, the control module output second control signal is to the gas detection module, to promote the gas Detection module detects the greenhouse gas concentration in the inner cavity in real time within a preset time, and the greenhouse gases that will test are dense Degree carries out data processing according to the control module is fed back to obtain the discharge amount of greenhouse gases.
2. greenhouse gas emissions automatic detection device according to claim 1, which is characterized in that the control module packet It includes:
Timing module exports standby signal to the micro process mould after reaching the first preset time, the second preset time respectively Block;
Micro treatment module, when receiving the standby signal for reaching the first preset time, output first control signal to the driving The module execution case lid lid closing operation, the micro treatment module output second control signal to the gas detection module, with Promote the gas detection module detection inner cavity percent of greenhouse gases concentration, and feeds back in the micro treatment module;
Micro treatment module when receiving the standby signal for reaching the second preset time, examine by output third control signal to the gas Module is surveyed, greenhouse gas concentration when promoting the gas detection module detection that will uncap in cabinets cavity, and feed back to In the micro treatment module.
3. greenhouse gas emissions automatic detection device according to claim 2, which is characterized in that the micro treatment module When receiving the standby signal for reaching second preset time, described in output the 4th control signal to drive module execution Case lid opening operation.
4. greenhouse gas emissions automatic detection device according to claim 1, which is characterized in that the drive module packet It includes:
Cylinder, the cylinder include cylinder body and setting in the intracorporal piston rod of the cylinder, and the case lid is arranged in the piston rod Go up and be located at the surface of the open end;
Air pump, output pressure power drives the piston rod that the case lid is driven to move up and down in Xiang Suoshu cylinder.
5. greenhouse gas emissions automatic detection device according to claim 4, which is characterized in that the drive module is also Include:
Reversing solenoid valve receives the control signal that the control module issues, and controls the air pump output positive air pressure power, drives It is moved downward to the case lid to close with the open end cap of the cabinet, or the control air pump exports reversed Pneumatic pressure power, drives The case lid is set to move up opening.
6. greenhouse gas emissions automatic detection device according to claim 1, which is characterized in that the gas detection mould Block includes but is not limited to: one of carbon dioxide sensor, methane transducer are a variety of.
7. a kind of greenhouse gas emissions automatic checkout system, which is characterized in that including temperature described in any one of claims 1-6 Room gas emissions automatic detection device is configured with the open end in the upper end of the cabinet, pacifies in the bottom end of the cabinet Equipped with bottom cover, the bottom cover is equipped with several air inlets.
8. greenhouse gas emissions automatic checkout system according to claim 7, which is characterized in that the system is also wrapped Include: test sample container, the bottom cover removably cover the top open part closed in the test sample container, and the inner cavity of the cabinet passes through The air inlet being arranged on the bottom cover is connected to the inner cavity of the test sample container.
9. a kind of greenhouse gas emissions automatic testing method, which is characterized in that utilize greenhouse gas described in claim 7 or 8 Body discharge amount automatic checkout system, which comprises
Control module exports first control signal to drive module, and the case lid lid is driven to close in the open end of the cabinet;
Control module exports second control signal to the gas detection module, detects when case lid lid closes in corresponding cabinets cavity Greenhouse gas concentration, and feed back in the control module;
After reaching preset time, to the gas detection module, detection will open the control module output third control signal Greenhouse gas concentration when case in cabinets cavity, and feed back in the control module;
The 4th control signal of control module output drives the case lid to be opened to drive module;
Greenhouse gas concentration when control module is closed according to case lid lid and when case lid is opened in corresponding cabinets cavity, is counted The discharge amount of greenhouse gases is obtained according to processing.
10. greenhouse gas emissions automatic testing method according to claim 9, which is characterized in that the control module When carrying out data processing, the discharge amount J of greenhouse gases is obtained according to following calculation formula:
J=(c2-c1)/(S·t0)
Wherein, J is greenhouse gas emission flux, unit mol/m2h;S is the area of section of cabinets cavity, unit m2;c1For The greenhouse gas concentration that case lid lid detects when closing, unit mol;c2For t0The greenhouse gas concentration detected after time, unit For mol;t0For case lid closing time, unit h.
CN201811623515.1A 2018-12-28 2018-12-28 Greenhouse gas emissions automatic detection device and system and method Pending CN109781943A (en)

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CN113848285A (en) * 2021-09-22 2021-12-28 北京大学 Method and system for measuring surface flux of active gas
CN116990088A (en) * 2023-07-31 2023-11-03 珠海深圳清华大学研究院创新中心 Greenhouse gas release monitoring device and method for town sewage system

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Application publication date: 20190521

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