CN114594216A - Method for monitoring flare waste gas emission - Google Patents
Method for monitoring flare waste gas emission Download PDFInfo
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- CN114594216A CN114594216A CN202210324149.XA CN202210324149A CN114594216A CN 114594216 A CN114594216 A CN 114594216A CN 202210324149 A CN202210324149 A CN 202210324149A CN 114594216 A CN114594216 A CN 114594216A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 178
- 239000007789 gas Substances 0.000 claims abstract description 123
- 238000005070 sampling Methods 0.000 claims abstract description 54
- 238000001914 filtration Methods 0.000 claims abstract description 27
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 20
- 230000001276 controlling effect Effects 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims description 20
- 239000000523 sample Substances 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 6
- 238000007781 pre-processing Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 230000006872 improvement Effects 0.000 description 16
- 239000002245 particle Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000004044 response Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention provides a method for monitoring flare waste gas emission, which comprises a sampling pump, a second gas outlet pipeline and a regulating pipeline, wherein the second gas outlet pipeline is communicated to a detection device and used for conveying waste gas to the detection device; extracting waste gas from a torch, and detecting and analyzing the waste gas after flow regulation, temperature regulation and filtration; the sampling pump collects waste gas and supplies the waste gas to the detection device through the second gas outlet pipeline, the gas flow required by the detection device is met by controlling the gas flow of the second gas outlet pipeline, and the gas output by the sampling pump is shunted by the adjusting pipeline. The method for monitoring the waste gas emission of the torch can monitor the waste gas in the torch on line, improve the flow rate of the waste gas sampling process, ensure the real-time performance of monitoring and effectively prevent the pipeline from being blocked.
Description
Technical Field
The invention belongs to the technical field of waste gas monitoring, and particularly relates to a method for monitoring flare waste gas emission.
Background
In the chemical industry, exhaust gases are generally hazardous. Especially in the exhaust gas discharged from a flare, the exhaust gas may contain a large amount of flammable, toxic, and Highly Reactive Volatile Organic Compounds (HRVOCs). Therefore, there is a need for real-time monitoring and analysis of exhaust gas from chemical production equipment or heavy machinery to achieve reduced emissions and pollution.
The existing monitoring of the waste gas discharged by a torch generally extracts the waste gas by a probe which extends into a discharge pipeline discharged by the torch, a sampling pump is arranged to provide pressure, and the waste gas is conveyed to a detection instrument for detection and analysis. However, the flow rate of the waste gas from the sampling position to the detection instrument is slow, the time is long, and the real-time performance of detection is influenced. The exhaust gas is easy to diffuse in the transmission process, the original state of the exhaust gas is changed, and the detection accuracy is influenced. And moreover, the torch waste gas contains a large amount of particles and moisture, so that the pipeline is easily blocked and corroded, and the detection effect is influenced.
Disclosure of Invention
Aiming at the defects, the invention provides a method for monitoring the waste gas emission of the torch, which can monitor the waste gas in the torch on line, improve the flow rate of the waste gas sampling process, ensure the real-time monitoring and effectively prevent the pipeline from being blocked.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a method for monitoring flare waste gas emission, which comprises a sampling pump, a second gas outlet pipeline and a regulating pipeline, wherein the second gas outlet pipeline is communicated to a detection device and used for conveying waste gas to the detection device;
extracting waste gas from a torch, and detecting and analyzing the waste gas after flow regulation, temperature regulation and filtration; the sampling pump collects waste gas and supplies the waste gas to the detection device through the second gas outlet pipeline, the gas flow required by the detection device is met by controlling the gas flow of the second gas outlet pipeline, and the gas output by the sampling pump is divided by using the adjusting pipeline.
According to a further improvement of the invention, the ratio of the flow rate of the split exhaust gas to the flow rate of the exhaust gas entering the detection device is 2-6: 1.
As a further improvement of the invention, a pretreatment device is adopted to regulate the flow of the waste gas;
the pretreatment device comprises a second air inlet pipeline, a sampling pump and a second air outlet pipeline which are connected in sequence, and the second air outlet pipeline is connected with the detection device; the sampling device also comprises an adjusting pipeline, and an inlet of the adjusting pipeline is connected with an outlet of the sampling pump.
As a further improvement of the invention, a first flow regulating valve is arranged on the regulating pipeline, and a second flow regulating valve is arranged on the second air outlet pipeline.
As a further improvement of the invention, when the temperature of the waste gas is regulated, the temperature of the whole process of conveying the waste gas from the torch to the detection device is controlled to be 60-180 ℃.
As a further improvement of the invention, a temperature control device is adopted to regulate the temperature of the waste gas;
the temperature control device comprises a first temperature control part, a second temperature control part and a third temperature control part;
when the temperature of the waste gas is regulated, the first temperature control part controls the temperature in the sampling device, the second temperature control part controls the temperature in a connecting pipeline connected between the sampling device and the pretreatment device, and the third temperature control part controls the temperature in the pretreatment device.
As a further improvement of the invention, the sampling device comprises a shell, a probe, a first air inlet pipe and a first air outlet pipe which are sequentially connected, wherein the air outlet end of the first air outlet pipe is connected with a connecting pipeline; the probe is positioned outside the shell, and the first air inlet pipe and the first air outlet pipe are both positioned in the shell; the first temperature control piece comprises an electric tracing piece, and the electric tracing piece is arranged on the outer surface of the shell; the shell is made of heat conducting materials;
the temperature in the first temperature control member control sampling device specifically includes:
the electric heat tracing piece generates heat, the shell is heated through shell heat conduction, and the temperature inside the shell is controlled, so that the temperature inside the shell is 60-180 ℃.
As a further improvement of the invention, the connecting pipeline and the second temperature control piece are integrated into a heat tracing pipeline;
the second accuse temperature piece control connection pipeline's temperature specifically includes:
the temperature in the heat tracing pipeline is controlled to be 60-180 ℃.
As a further improvement of the invention, the pretreatment device comprises a heat preservation box body, and a second air inlet pipeline, a sampling pump and a second air outlet pipeline which are sequentially connected in the heat preservation box body, wherein the second air inlet pipeline is connected with the connecting pipeline, and the second air outlet pipeline is connected with the detection device; the third temperature control part comprises a second heater which is arranged in the heat preservation box body;
the third temperature control member controls the temperature of the pretreatment device, and specifically comprises:
the second heater directly heats the interior of the heat preservation box body, and controls the temperature of the interior of the heat preservation box body, so that the temperature of the interior of the heat preservation box body is 60-180 ℃.
As a further improvement of the present invention, when filtering the exhaust gas, the exhaust gas passes through the first filter, the second filter and the third filter in sequence; the first filter is located at an inlet for sucking the exhaust gas, and the third filter is located at an inlet of the detection device.
As a further improvement of the invention, when the exhaust gas is filtered, the first filter filters particles in the exhaust gas, the second filter filters moisture and particles in the exhaust gas, and the third filter filters particles in the exhaust gas again.
As a further improvement of the invention, the filtering precision of the first filter, the second filter and the third filter is increased in sequence.
As a further improvement of the invention, the method also comprises the following steps:
a calibration step: and calibrating the detection device.
As a further improvement of the present invention, the calibrating the detection device specifically includes:
judging whether the current detection period of the detection device is finished or not; if the detection is finished, stopping inputting the waste gas into the detection device, directly inputting the standard gas into the detection device, and calibrating by the detection device; if not, after the current detection period of the detection device is finished, stopping inputting the waste gas into the detection device, directly inputting the standard gas into the detection device, and calibrating by the detection device.
As a further improvement of the present invention, the calibrating step further includes: and calibrating the whole system.
As a further improvement of the present invention, the calibrating the whole system specifically includes:
judging whether the current detection period of the detection device is finished or not; if the process is finished, stopping inputting the waste gas into the detection device, inputting standard gas from the position where the waste gas is extracted, inputting the standard gas into the detection device after flow regulation, temperature regulation and filtration, and calibrating by the detection device; if not, after the current detection period of the detection device is finished, stopping inputting the waste gas into the detection device, inputting the standard gas from the position where the waste gas is extracted, inputting the standard gas into the detection device after the standard gas is subjected to flow regulation, temperature regulation and filtration, and calibrating by the detection device.
As a further improvement of the invention, the waste gas after detection and analysis is recovered, the pressure at the recovery inlet is adjusted to make the pressure at the recovery inlet approach the normal pressure, and the waste gas is pressurized and conveyed to a torch.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects: according to the method for monitoring the waste gas emission of the torch, after the waste gas is extracted from the torch, the flow of the waste gas is regulated, so that the flow requirement of a detection device is met, the flow rate of the waste gas entering the detection device is increased, the detection response speed is increased, and the real-time performance of monitoring is guaranteed; the temperature of the waste gas is regulated, so that the components and the state of the waste gas are not changed in the whole process, and the detection precision is improved; through filtering waste gas, can prevent effectively that the pipeline from blockking up, protect detection device simultaneously. The method for monitoring the waste gas emission of the torch can monitor the waste gas in the torch on line, improve the flow rate of the waste gas sampling process, ensure the real-time performance of monitoring and effectively prevent the pipeline from being blocked.
Detailed Description
The technical solution of the present invention will be explained in detail below.
The embodiment of the invention provides a method for monitoring flare waste gas emission, which is based on a flare waste gas emission monitoring system. The flare waste gas emission monitoring system comprises a detection device, a sampling pump, a second gas outlet pipeline communicated to the detection device and used for conveying waste gas for the detection device, and an adjusting pipeline.
The method provided by the embodiment of the invention comprises the following steps: extracting waste gas from the torch, and detecting and analyzing the waste gas after flow regulation, temperature regulation and filtration. The sampling pump collects waste gas and supplies the waste gas to the detection device through the second gas outlet pipeline, the gas flow required by the detection device is met by controlling the gas flow of the second gas outlet pipeline, and the gas output by the sampling pump is shunted by the adjusting pipeline.
According to the method for monitoring the waste gas emission of the torch, after the waste gas is extracted from the torch, the flow rate of the waste gas is adjusted, the flow rate of the waste gas entering the detection device is increased while the flow rate requirement of the detection device is met, the detection response speed is increased, and the real-time performance of monitoring is guaranteed; the temperature of the waste gas is regulated, so that the components and the state of the waste gas are not changed in the whole process, and the detection precision is improved; through filtering waste gas, can prevent effectively that the pipeline from blockking up, protect detection device simultaneously. The method for monitoring the waste gas emission of the torch can monitor the waste gas in the torch on line, improve the flow rate of the waste gas sampling process, ensure the real-time performance of monitoring and effectively prevent the pipeline from being blocked.
Preferably, the ratio of the flow rate of the branched off exhaust gas to the flow rate of the exhaust gas entering the detection device is 2-6: 1. The flow distribution effect is improved, so that the flow of the waste gas entering the detection device is further accurately controlled, the flow speed of the waste gas entering the detection device is improved, and the detection response speed is further improved.
There are various methods for adjusting the flow rate of the exhaust gas, and the preferred embodiment uses a pretreatment device to adjust the flow rate of the exhaust gas.
The pretreatment device comprises a second air inlet pipeline, a sampling pump and a second air outlet pipeline which are connected in sequence, and the second air outlet pipeline is connected with the detection device. The pretreatment device also comprises an adjusting pipeline, and the inlet of the adjusting pipeline is connected with the outlet of the sampling pump.
Specifically, adopt preprocessing device to carry out flow control to waste gas, specifically include:
the sampling pump works, and waste gas quickly enters the second air inlet pipeline under the suction of the sampling pump, so that the flow rate of the waste gas in the pipeline is improved. Waste gas is through sampling pump back, adjusts the unnecessary waste gas of pipeline reposition of redundant personnel, and the control flows into the second and goes out the waste gas flow that the pipeline then got into detection device, guarantees that the waste gas flow that gets into detection device satisfies detection device's requirement, improves waste gas simultaneously and gets into detection device's speed.
The preferred embodiment provides power for exhaust flow by including a sample pump, increasing exhaust flow rate and thus detection response speed. Set up the regulation pipeline in the export of sampling pump, regulation pipeline 4 plays the reposition of redundant personnel effect for partly inflow regulation pipeline of waste gas through the sampling pump suction, another part flows into the second and gives vent to anger the pipeline and then flows into detection device, reduces the waste gas flow who gets into detection device, improves the velocity of flow that gets into detection device, then improves and detects response speed.
Preferably, the regulating pipeline is provided with a first flow regulating valve, and the second gas outlet pipeline is provided with a second flow regulating valve. Set up first flow control valve on the governing pipeline, the accessible adjusts first flow control valve, realizes getting into the control of the exhaust gas flow of governing pipeline, improves the reposition of redundant personnel effect of governing pipeline. And a second flow regulating valve is arranged on the second air outlet pipeline, so that the flow of the waste gas flowing into the detection instrument is accurately controlled, and the flow requirement of the detection instrument is met. Through the cooperation of first flow control valve and second flow control valve, but the exhaust gas flow that accurate control shunted is compared with the exhaust gas flow who gets into detection device to effectively improve reposition of redundant personnel effect, improve the velocity of flow that gets into detection device, improve detection response speed then.
Considering that the components of the torch waste gas are complex and the component change is large, in the process from a sampling position to a detection instrument, if the temperature is low, the waste gas is easy to change from a gaseous state to a gas-liquid mixed state, and the components are also easy to change, so that the detection instrument cannot accurately perform detection and analysis. As a preferred example, the temperature adjustment of the exhaust gas specifically includes:
and controlling the temperature of the whole process of conveying the waste gas from the torch to the detection device to be 60-180 ℃.
The preferred embodiment makes waste gas from sample, transmission to preliminary treatment in the whole environment that the temperature is higher than the highest dew point temperature in the waste gas composition, guarantees that whole composition and the state of waste gas can not change, improves and detects the precision.
There are various methods for adjusting the flow rate of the exhaust gas, and the temperature control device is used to adjust the temperature of the exhaust gas in the preferred embodiment.
The temperature control device comprises a first temperature control part, a second temperature control part and a third temperature control part.
Adopt temperature control device to carry out temperature regulation to waste gas, specifically include: the first temperature control part controls the temperature in the sampling device, the second temperature control part controls the temperature in a connecting pipeline connected between the sampling device and the pretreatment device, and the third temperature control part controls the temperature in the pretreatment device.
In the preferred embodiment, the first temperature control part, the second temperature control part and the third temperature control part are used for enabling the whole process of sampling, transmitting and preprocessing of the waste gas to be in an environment with the temperature range of 60-180 ℃, so that the components and the state of the waste gas in the whole process can be further guaranteed not to change, and the detection precision is improved.
Preferably, the sampling device comprises a shell, and a probe, a first air inlet pipe and a first air outlet pipe which are connected in sequence, wherein the air outlet end of the first air outlet pipe is connected with the connecting pipeline. The probe is located the casing outside, and first intake pipe and first outlet duct all are located the casing. The first temperature control member comprises an electric tracing member which is arranged on the outer surface of the shell. The shell is made of heat conducting materials. The electric heat tracing piece is an electric heat tracing band or an electric heat tracing block.
First accuse temperature piece control sampling device's temperature specifically includes:
the electric heat tracing piece generates heat, the shell is heated through shell heat conduction, and the temperature inside the shell is controlled, so that the temperature inside the shell is 120-180 ℃.
In this preferred embodiment, set up first intake pipe and first outlet duct in the casing, generate heat through electric tracing piece, through inside the casing heat conduction heating casing of casing, the temperature control of being convenient for waste gas just is in higher temperature environment when the sampling.
Preferably, the connecting pipeline and the second temperature control member are integrated into a heat tracing pipeline.
The second accuse temperature piece control connection pipeline's temperature specifically includes:
the temperature in the heat tracing pipeline is controlled to be 60-180 ℃.
In the preferred embodiment, the sampling device is directly connected with the pretreatment device through the heat tracing pipeline, so that the waste gas can be transmitted and heated and kept warm, and the device is simple in structure and easy to control.
Preferably, the pretreatment device comprises a heat preservation box body, and a second air inlet pipeline, a sampling pump and a second air outlet pipeline which are arranged in the heat preservation box body and connected in sequence, wherein the second air inlet pipeline is connected with the connecting pipeline, and the second air outlet pipeline is connected with the detection device. The third temperature control member comprises a second heater, and the second heater is arranged in the heat preservation box body. The second heater is an electric heater or a steam heater.
The third accuse temperature piece control preprocessing device's temperature specifically includes:
the second heater directly heats the interior of the heat preservation box body, and controls the temperature of the interior of the heat preservation box body, so that the temperature of the interior of the heat preservation box body is 60-180 ℃.
In the preferred embodiment, the second air inlet pipe, the sampling pump and the second air outlet pipe are arranged in the heat preservation box body, so that the temperature is convenient to control, the length of a flow path is reduced, and the heat preservation box is convenient to overhaul. The interior of the heat preservation box body is directly heated through the second heater, and the temperature of the interior of the heat preservation box body is controlled.
Considering that the flare waste gas contains a large amount of particles and moisture, the pipeline is easy to be blocked and corroded, and therefore the detection effect is influenced. This preferred embodiment filters waste gas, specifically includes:
the exhaust gas is passed through a first filter, a second filter and a third filter in this order. The first filter is located at an inlet for sucking the exhaust gas, and the third filter is located at an inlet of the detection device. The first filter filters particulates from the exhaust, the second filter filters moisture and particulates from the exhaust, and the third filter filters particulates from the exhaust again.
In the preferred embodiment, the sampling inlet is provided with the first filter, so that the waste gas is filtered in the initial sampling period, particles in the waste gas are filtered, and primary filtration is realized. And the second filter is positioned in the middle and is used for carrying out secondary filtration on the waste gas, filtering out particles in the waste gas and simultaneously filtering out water vapor in the waste gas. And a third filter is arranged at the inlet of the detection device, and particles in the exhaust gas are filtered again before entering the detection device, so that final-stage filtration is realized. The cubic is filtered, improves the filter effect, prevents effectively that the sample pipeline from being blockked up and corroded, protects detection device simultaneously.
Preferably, the filtering precision of the first filter, the second filter and the third filter is increased sequentially. The first filter filters the bigger granule in the waste gas earlier at the sampling initial stage, does not influence the velocity of flow of waste gas in the pipeline simultaneously, and the second filter filters the less granule in the waste gas again, further improves the filter effect. The third filter filters smaller particles in the waste gas before the waste gas enters the detection device, so that the filtering effect is ensured, and the particles are prevented from entering the detection device.
As a preferred example, the monitoring method according to the embodiment of the present invention further includes:
a calibration step: and calibrating the detection device.
After the detection device operates for a certain time, the detection precision of the detection device can be improved by calibrating the detection device.
Preferably, calibrating the detection device specifically includes:
and judging whether the current detection period of the detection device is finished or not. And if the detection is finished, stopping inputting the waste gas into the detection device, directly inputting the standard gas into the detection device, and calibrating the detection device. If not, after waiting for the current detection period of the detection device to be ended, stopping inputting the waste gas into the detection device, directly inputting the standard gas into the detection device, and calibrating the detection device.
In the preferred embodiment, before the standard gas is input into the detection device, whether the current detection period of the detection device is finished or not is judged, the standard gas is input into the detection device only after the current detection period is finished, and the detection device carries out calibration, so that the standard gas is not input in the process of one detection period of the detection device, the detection result is not influenced, and the calibration process and the detection process are in complementary interference.
The calibrating the detecting device is to calibrate only the detecting device, and preferably, the calibrating step further includes: and calibrating the whole system.
The preferred embodiment performs full system calibration on the whole monitoring system, can detect the integrity, response time, connection condition between components and air tightness of a detection pipeline of the whole system, and improves the detection precision and safety of the monitoring system.
Preferably, the calibrating of the whole system specifically includes:
and judging whether the current detection period of the detection device is finished or not. And if the detection is finished, stopping inputting the waste gas into the detection device, inputting the standard gas from the position for extracting the waste gas, inputting the standard gas into the detection device after the flow regulation, the temperature regulation and the filtration, and calibrating by the detection device. If not, after the current detection period of the detection device is finished, stopping inputting the waste gas into the detection device, inputting the standard gas from the position where the waste gas is extracted, inputting the standard gas into the detection device after the standard gas is subjected to flow regulation, temperature regulation and filtration, and calibrating by the detection device.
In the preferred embodiment, the standard gas is input from the waste gas extraction position during the calibration of the whole system, so that the standard gas is input into the detection device through the whole pipeline, the integrity, the response time, the connection condition between components and the air tightness of the detection pipeline of the whole system can be detected, and the detection precision and the safety of the monitoring system are improved. Before the standard gas is input, whether the current detection period of the detection device is finished or not is judged, the standard gas is input only after the current detection period is finished, the detection device carries out calibration, the standard gas is not input in the process of one detection period of the detection device, the detection result is not influenced, and the calibration process and the detection process are in complementary interference.
Preferably, the exhaust gas after detection and analysis is recovered, the pressure at the recovery inlet is adjusted so that the pressure at the recovery inlet is close to the normal pressure, and the exhaust gas is pressurized and delivered to a torch.
The preferred embodiment recovers and pressurizes the waste gas after detection and analysis, and conveys the waste gas to a torch for combustion and discharge, and the waste gas is not directly discharged into the atmosphere, so that the atmospheric pollution is reduced, and the environment is protected. The pressure at the recycling inlet is adjusted simultaneously, so that the pressure at the recycling inlet is close to the normal pressure, the backpressure at the outlet of the detection device is avoided, and the detection precision of the detection device is not influenced.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to further illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (17)
1. A method for monitoring the discharge of flare waste gas is characterized by comprising a sampling pump, a second gas outlet pipeline communicated to a detection device and used for conveying waste gas to the detection device, and an adjusting pipeline;
extracting waste gas from a torch, and detecting and analyzing the waste gas after flow regulation, temperature regulation and filtration; the sampling pump collects waste gas and supplies the waste gas to the detection device through the second gas outlet pipeline, the gas flow required by the detection device is met by controlling the gas flow of the second gas outlet pipeline, and the gas output by the sampling pump is shunted by the adjusting pipeline.
2. The method for monitoring flare exhaust gas emissions of claim 1, wherein the ratio of the split exhaust gas flow to the exhaust gas flow entering the detection device is 2 to 6: 1.
3. The method for monitoring flare exhaust gas emissions of claim 1, wherein the exhaust gas is flow regulated with a pretreatment device;
the pretreatment device comprises a second air inlet pipeline, a sampling pump and a second air outlet pipeline which are connected in sequence, and the second air outlet pipeline is connected with the detection device; the sampling device also comprises an adjusting pipeline, and an inlet of the adjusting pipeline is connected with an outlet of the sampling pump.
4. A method for monitoring flare exhaust gas emissions according to claim 3, wherein the regulating line is provided with a first flow regulating valve and the second outlet line is provided with a second flow regulating valve.
5. The method for monitoring the discharge of flare exhaust gas as claimed in claim 1, wherein the temperature of the exhaust gas is regulated by controlling the temperature of the exhaust gas to be 60-180 ℃ during the whole transportation process from the flare to the detection device.
6. The method for monitoring flare exhaust gas emissions of claim 5, wherein the exhaust gas is temperature regulated with a temperature control device;
the temperature control device comprises a first temperature control part, a second temperature control part and a third temperature control part;
when the temperature of the waste gas is regulated, the first temperature control part controls the temperature in the sampling device, the second temperature control part controls the temperature in a connecting pipeline connected between the sampling device and the pretreatment device, and the third temperature control part controls the temperature in the pretreatment device.
7. The method for monitoring the discharge of flare exhaust gas as claimed in claim 6, wherein the sampling device comprises a shell and a probe, a first gas inlet pipe and a first gas outlet pipe which are connected in sequence, and the gas outlet end of the first gas outlet pipe is connected with a connecting pipeline; the probe is positioned outside the shell, and the first air inlet pipe and the first air outlet pipe are both positioned in the shell; the first temperature control piece comprises an electric heat tracing piece, and the electric heat tracing piece is arranged on the outer surface of the shell; the shell is made of heat conducting materials;
the temperature in the first accuse temperature piece control sampling device specifically includes:
the electric heat tracing piece generates heat, the shell is heated through shell heat conduction, and the temperature inside the shell is controlled, so that the temperature inside the shell is 60-180 ℃.
8. The method for monitoring flare exhaust gas emissions according to claim 6, wherein the connecting line is integrated with the second temperature control member as a heat trace line;
the second accuse temperature piece control connection pipeline's temperature specifically includes:
the temperature in the heat tracing pipeline is controlled to be 60-180 ℃.
9. The method for monitoring flare exhaust gas emission according to claim 6, wherein the pretreatment device comprises a holding tank, and a second gas inlet pipeline, a sampling pump and a second gas outlet pipeline which are sequentially connected in the holding tank, wherein the second gas inlet pipeline is connected with the connecting pipeline, and the second gas outlet pipeline is connected with the detection device; the third temperature control part comprises a second heater which is arranged in the heat preservation box body;
the third accuse temperature piece control preprocessing device's temperature specifically includes:
the second heater directly heats the interior of the heat preservation box body, and controls the temperature of the interior of the heat preservation box body, so that the temperature of the interior of the heat preservation box body is 60-180 ℃.
10. The method for monitoring flare exhaust gas emissions according to claim 1, wherein the filtering of the exhaust gas is performed by passing the exhaust gas through a first filter, a second filter, and a third filter in that order; the first filter is located at an inlet for sucking the exhaust gas, and the third filter is located at an inlet of the detection device.
11. The method for monitoring flare exhaust emissions of claim 10, wherein filtering the exhaust gas comprises a first filter filtering out particulates from the exhaust gas, a second filter filtering out moisture and particulates from the exhaust gas, and a third filter filtering out particulates from the exhaust gas again.
12. The method for monitoring flare exhaust gas emissions of claim 11, wherein the filtration precision of the first, second, and third filters is sequentially increasing.
13. The method for monitoring flare exhaust gas emissions of claim 1, further comprising:
a calibration step: and calibrating the detection device.
14. A method for monitoring flare exhaust gas emissions according to claim 13, wherein the calibrating the detection device comprises in particular:
judging whether the current detection period of the detection device is finished or not; if the detection is finished, stopping inputting the waste gas into the detection device, directly inputting the standard gas into the detection device, and calibrating by the detection device; if not, after the current detection period of the detection device is finished, stopping inputting the waste gas into the detection device, directly inputting the standard gas into the detection device, and calibrating by the detection device.
15. The method for monitoring flare exhaust gas emissions of claim 14, wherein the calibrating step further comprises: and calibrating the whole system.
16. The method for monitoring flare exhaust gas emissions of claim 15, wherein the calibrating the full system comprises:
judging whether the current detection period of the detection device is finished or not; if the process is finished, stopping inputting the waste gas into the detection device, inputting standard gas from the position where the waste gas is extracted, inputting the standard gas into the detection device after flow regulation, temperature regulation and filtration, and calibrating by the detection device; if not, after the current detection period of the detection device is finished, stopping inputting the waste gas into the detection device, inputting the standard gas from the position where the waste gas is extracted, inputting the standard gas into the detection device after the standard gas is subjected to flow regulation, temperature regulation and filtration, and calibrating by the detection device.
17. The method of claim 1, wherein the exhaust gas after the detection and analysis is recovered, the pressure at the recovery inlet is adjusted so that the pressure at the recovery inlet is near atmospheric pressure, and the exhaust gas is pressurized for delivery to the flare.
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