CN112162066A - Methane composition on-line monitoring device for high-pressure gas pipeline - Google Patents
Methane composition on-line monitoring device for high-pressure gas pipeline Download PDFInfo
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims description 33
- 239000000203 mixture Substances 0.000 title claims description 4
- 238000012544 monitoring process Methods 0.000 claims abstract description 129
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910001868 water Inorganic materials 0.000 claims abstract description 44
- 239000002808 molecular sieve Substances 0.000 claims abstract description 11
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 279
- 238000004891 communication Methods 0.000 claims description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 8
- 239000001569 carbon dioxide Substances 0.000 claims description 8
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical group S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000000855 fermentation Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 231100000572 poisoning Toxicity 0.000 description 3
- 230000000607 poisoning effect Effects 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000004164 analytical calibration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 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
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
-
- 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
- G01N33/0073—Control unit therefor
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a biogas component online monitoring device for a high-pressure gas pipeline, which belongs to the technical field of gas monitoring equipment and comprises a shell and a gas monitoring instrument module, wherein the shell is provided with a calibration air inlet, a gas inlet to be monitored, an exhaust port and a water outlet; a two-stage pressure reducing valve is arranged on the first gas conveying pipe; the calibration air inlet is connected with the second inlet on the two-position three-way electromagnetic valve through the second gas conveying pipe, the outlet of the two-position three-way electromagnetic valve is sequentially connected with the inlet of the oil-water filter through the molecular sieve and the air suction pump, the air outlet of the oil-water filter is connected with the air inlet end of the gas monitoring instrument module, the water outlet of the oil-water filter is connected with the water outlet, and the air outlet end of the gas monitoring instrument module is connected with the air outlet in the shell. The invention controls the pressure of the gas entering the gas monitoring instrument module within the normal use range of the instrument by adopting the two-stage pressure reducing valve.
Description
Technical Field
The invention belongs to the technical field of gas monitoring equipment, and particularly relates to a methane component online monitoring device for a high-pressure gas pipeline.
Background
The bio-natural gas can be compressed and used in the fields of vehicle fuel (CNG), Cogeneration of Heat and Power (CHP), natural gas pipe network integration, fuel cells, chemical raw materials and the like. The use of the bio-natural gas by the automobile can not only reduce the air pollution caused by exhaust emission, but also reduce the net emission of greenhouse gases by 75-200%, and in addition, the bio-natural gas can be mixed into the existing natural gas pipe network to reduce the dependence on petrochemical energy.
The biogas broadly comprises biogas, biomass gas, biological hydrogen production and the like, and in the work, the biogas generated by anaerobic fermentation and organic matters such as livestock and poultry manure, crop straws, municipal domestic waste, industrial organic waste and the like are used as fuel gas generated by anaerobic fermentation. The biogas generally comprises 50-70% of methane (CH4) and 30-50% of carbon dioxide (CO2) by volume fraction, and the relative content of CH4 and CO2 mainly depends on the properties of the organic matter raw material and the parameters of temperature, pH and the like of the bioreactor system. In the process of producing the biogas, the gas production rate and the gas production composition can be regulated and controlled by adjusting the proportion of the multielement mixed raw materials, the anaerobic fermentation temperature and the like.
The production and utilization of biogas have been over 100 years old, but the high content of components such as CO2, H2S and H2O limit the large-scale commercial utilization of biogas. Therefore, the raw biogas must be upgraded to produce biogas (also known as biomethane) with a higher CH4 content.
In the field of purification of biogas, the concentration of methane, oxygen, hydrogen sulfide and other gases needs to be monitored at production process points before desulfurization and the like, so that the process adjustment of the production process is performed, including the proportion of mixed raw materials, the temperature of anaerobic fermentation and the like, and the components of the purified biogas are detected after desulfurization, so that the concentration of the purified gas can meet the requirement of commercial application. Therefore, in the field of purification of biogas, a gas monitoring process is indispensable.
Because the pressure of the natural gas pipeline after desulfurization is high, the existing conventional instrument cannot realize stable and reliable monitoring on the field gas concentration, and the damage of the gas pipeline and the fault of the gas detection instrument can be caused by overhigh pressure, so that the equipment suitable for monitoring the methane component in the high-pressure gas pipeline has very important application value.
Disclosure of Invention
The invention aims to provide a biogas component online monitoring device for a high-pressure gas pipeline, which is characterized in that a two-stage pressure reducing valve is arranged, so that the pressure of gas entering an instrument detection unit is controlled within the normal use range of the instrument, the circulating entering of air and high-pressure gas to be tested can be realized by time-sharing control of a two-position three-way electromagnetic valve, the air can sweep impurity particles in a gas circuit, the occurrence of pipeline blockage is avoided, the service life of a sensor can be prolonged by switching the gas circuit, particularly, the poisoning phenomenon of an electrochemical sensor can be avoided, and the long-term stable operation of a rear-end detection instrument is ensured. The needle valve is arranged at the inlet end of the re-flowmeter to control the gas flow rate, so that the phenomena of inaccurate gas time measurement fluctuation and the like caused by overlarge internal pipeline pressure are avoided. The safety valve is additionally arranged at the front end of the gas monitoring instrument module, so that when the double-stage pressure reducing valve fails, the rear-end gas pressure is too high to damage the gas monitoring instrument module.
In order to achieve the purpose, the invention adopts the following technical scheme: gaseous on-line monitoring device, including the inside gaseous monitoring instrument module of casing and casing, its characterized in that: the shell is provided with a calibration air inlet, a gas inlet to be monitored, an exhaust port and a water outlet, the gas inlet to be monitored is connected with a first inlet on the two-position three-way electromagnetic valve through a first gas conveying pipe, and the first gas conveying pipe is provided with a two-stage pressure reducing valve; the calibration air inlet is connected with the second inlet on the two-position three-way electromagnetic valve through a second gas conveying pipe, the outlet of the two-position three-way electromagnetic valve is connected with the inlet of the molecular sieve, the outlet of the molecular sieve is connected with the inlet of the oil-water filter through a suction pump, the gas outlet of the oil-water filter is connected with the gas inlet end of the gas monitoring instrument module, the water outlet of the oil-water filter is connected with the water outlet on the shell through a water discharging pipe, and the gas outlet end of the gas monitoring instrument module is connected with;
the gas monitoring instrument module comprises a plurality of gas monitoring instruments, the gas inlet end of a first gas monitoring instrument in the plurality of gas monitoring instruments is connected with the gas outlet of the oil-water filter, the gas outlet end of a last gas monitoring instrument in the plurality of gas monitoring instruments is connected with the gas outlet on the shell, and the gas inlet end and the gas outlet end of the gas monitoring instrument between the first gas monitoring instrument and the last gas monitoring instrument are sequentially connected in series through corresponding gas guide tubes.
The pressure of gas entering the gas monitoring instrument is controlled within the normal use range of the instrument by adopting a two-stage pressure reducing valve; in addition, adopt two three way solenoid valves, open through the corresponding gas circuit passageway of control module control two three way solenoid valves, make calibration air and the high-pressure gas (marsh gas) circulation that waits to detect get into gas monitoring instrument module, it is specific, according to the circumstances, adopt the timesharing control function, can realize calibration air and the circulation that waits to monitor high-pressure gas through timesharing control two three way solenoid valves and get into, calibration air can sweep the foreign particle in the gas circuit, avoid the pipeline jam condition to take place, and can prolong the life of sensor through switching the gas circuit, especially can avoid it to appear the poisoning phenomenon to electrochemical sensor, thereby guarantee the long-term steady operation of rear end detecting instrument.
Furthermore, the molecular sieve is connected with the air pump through a gas conveying pipeline IV, a flow meter is arranged on the conveying pipeline IV, and a needle valve is arranged at an air inlet of the flow meter. The needle valve is arranged at the air inlet end of the re-flowmeter to control the gas flow rate, so that the phenomena of inaccurate gas test fluctuation and the like caused by overlarge internal pipeline pressure are avoided, and the accuracy and the stability of a gas test numerical value are ensured.
Further, the gas outlet of the oil-water filter is connected with the gas inlet end of the gas monitoring instrument through a gas conveying pipeline seven, and a safety valve is arranged on the gas conveying pipeline seven. Increase at the front end of gas monitoring instrument module and set up the relief valve, when preventing that doublestage relief pressure valve from breaking down, rear end gas pressure is too big to cause the harm to detecting instrument, during the concrete use, when gas pressure detector detected the gas pressure who gets into gas monitoring instrument module and exceeded the admission threshold value, control module control relief valve opened the pressure release automatically to the protection gas monitoring instrument module is not damaged.
Furthermore, the number of the gas monitoring instruments is 4, the 4 gas monitoring instruments are respectively a first gas monitoring instrument, a second gas monitoring instrument, a third gas monitoring instrument and a fourth gas monitoring instrument, the gas inlet end of the first gas monitoring instrument is connected with the gas outlet of the oil-water filter through a gas conveying pipeline seven, and the gas outlet end of the first gas monitoring instrument is connected with the gas inlet end of the second gas monitoring instrument through a gas guide pipe I;
the air outlet end of the second gas monitoring instrument is connected with the air inlet end of the third gas monitoring instrument through a second air guide pipe;
the air outlet end of the third gas monitoring instrument is connected with the air inlet end of the fourth gas monitoring instrument through a third air guide pipe;
the air outlet end of the fourth gas monitoring instrument is connected with an air outlet on the shell through a fourth air guide pipe.
The device further comprises a control module, wherein a communication interface and a power interface are arranged on the shell; the signal output of the gas monitoring instrument module is connected with the signal input of the control module through an RS485 communication module, and the signal output of the control module is connected with the touch display screen through an RS232 communication module; the signal output of the gas monitoring instrument module is also connected with a terminal server through a 4-20mA communication module, and the signal output of the control module is respectively connected with the two-position three-way electromagnetic valve and the control end of the air pump.
The touch display screen adopts an industrial-grade touch display screen, and the touch display screen can display the concentrations of various corresponding gas components monitored by the gas monitoring instruments.
Furthermore, the system also comprises an infrared receiver and an infrared remote controller. Through setting up infrared remote controller and infrared receiver, can be through infrared remote controller through explosion-proof glass window to instrument calibration, communication setting, set up functions such as gaseous kind selection, a key recovery. The explosion-proof shell does not need to be opened to carry out corresponding setting operation, the remote control function can be realized, and the operation is simpler and more convenient.
Furthermore, the shell is made of explosion-proof materials, a power supply for supplying power to the control module and the electrical appliances is arranged in the shell, and a power switch is arranged on the shell. The shell is made of explosion-proof materials, the whole shell is designed in an explosion-proof mode, safety is high, the explosion-proof shell is particularly suitable for industrial site environments with explosion-proof requirements, operation is simple, practicability is high, and the explosion-proof shell has high popularization and application values.
Further, the first gas monitoring instrument is a methane detector; the second gas monitoring instrument is an oxygen detector; the third gas monitoring instrument is a carbon dioxide detector; the fourth gas monitoring instrument is a hydrogen sulfide detector.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a gas monitoring instrument module in the housing according to the present invention;
FIG. 3 is a diagram of the internal gas circuit of the present invention;
FIG. 4 is a block diagram of the electrical control scheme of the present invention;
in the figure: the gas monitoring device comprises a gas conveying pipeline seven 007, a first gas monitoring instrument 01, a second gas monitoring instrument 02, a third gas monitoring instrument 03, a fourth gas monitoring instrument 04, a shell 100, a calibration air inlet 101, a gas inlet 102 to be monitored, an exhaust port 103, a water outlet 104, a communication interface 105, a power supply interface 106, a two-stage pressure reducing valve 200, a two-position three-way electromagnetic valve 300, a molecular sieve 400, an air pump 500, a flow meter 600, a needle valve 700, an oil-water filter 800, a safety valve 900 and a touch display screen 1000.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following description will be made in conjunction with specific embodiments thereof:
as shown in fig. 1-4, the online monitoring device for biogas components for high-pressure gas pipelines comprises a housing 100 and a gas monitoring instrument module inside the housing 100, wherein the housing 100 is provided with a calibration air inlet 101, a gas inlet 102 to be monitored, an exhaust port 103, a water outlet 104, a communication interface 105 and a power supply interface 106.
The gas inlet 102 to be monitored is connected with the first inlet on the two-position three-way electromagnetic valve 300 through the first gas conveying pipe, the first gas conveying pipe is provided with the two-stage pressure reducing valve 200, the calibration air inlet 101 is connected with the second inlet on the two-position three-way electromagnetic valve 300 through the second gas conveying pipe, the outlet of the two-position three-way electromagnetic valve 300 is connected with the inlet of the molecular sieve 400 through the third gas conveying pipe, the outlet of the molecular sieve 400 is connected with the inlet of the air extracting pump 500 through the fourth gas conveying pipe, the fourth gas conveying pipe is provided with the flow meter 600, the flow meter 600 in the embodiment is a float flow meter. The outlet of the air pump 500 is connected with the inlet of the oil-water filter 800 through a gas delivery pipe five, the gas outlet of the oil-water filter 800 is connected with the gas inlet end of the gas monitoring instrument module through a gas delivery pipe seven, a safety valve 900 is arranged on the gas delivery pipe seven 007, the water outlet of the oil-water filter 800 is connected with the water outlet 103 on the shell 100 through a water discharge pipe, and the gas outlet end of the gas monitoring instrument module is connected with the gas outlet 103 on the shell 100.
The present embodiment controls the pressure of the gas entering the gas monitoring instrument module within the normal use range of the instrument by using the two-stage pressure reducing valve 200. In addition, adopt two three way solenoid valve 300, the corresponding inlet channel of two three way solenoid valve 300 is opened through control module control, make calibration air and the high-pressure gas circulation that waits to detect get into gas monitoring instrument module, it is concrete, according to the circumstances, adopt the timesharing control function, can realize calibration air and the circulation that waits to monitor gas through timesharing control two three way solenoid valve 300 and get into, calibration air can sweep the foreign particle in the gas circuit, avoid the pipeline jam condition to take place, and can prolong the life of sensor through switching the gas circuit, especially can avoid it to appear the poisoning phenomenon to electrochemical sensor, thereby guarantee the long-term steady operation of rear end detecting instrument. The needle valve 700 is arranged at the air inlet of the flowmeter 600 to control the gas flow rate, so that the phenomena of inaccurate gas test fluctuation and the like caused by overlarge pressure of an internal pipeline can be avoided, and the accuracy and the stability of a gas test value are ensured.
Increase at the front end of gas monitoring instrument module and set up relief valve 900, when preventing that doublestage relief pressure valve 200 from breaking down, rear end gas pressure is too big to cause the harm to detecting instrument, during the concrete use, when the gas pressure detector detects that the gas pressure who gets into gas monitoring instrument module surpasss the admission threshold value, control module control relief valve 900 is automatic to be opened to the protection gas monitoring instrument module is not damaged.
The gas monitoring instrument module comprises a plurality of gas monitoring instruments, the gas inlet end of a first gas monitoring instrument in the plurality of gas monitoring instruments is connected with the gas outlet of the oil-water filter 800, the gas outlet end of a last gas monitoring instrument in the plurality of gas monitoring instruments is connected with the gas outlet 103 on the shell 100, and the gas inlet end and the gas outlet end of the gas monitoring instrument between the first gas monitoring instrument and the last gas monitoring instrument are sequentially connected in series through corresponding gas guide tubes.
The number of the gas monitoring instruments in the embodiment is 4, the 4 gas monitoring instruments are respectively a first gas monitoring instrument 01, a second gas monitoring instrument 02, a third gas monitoring instrument 03 and a fourth gas monitoring instrument 04, wherein the first gas monitoring instrument 01 is a methane detector; the second gas monitoring instrument 02 is an oxygen detector; the third gas monitoring instrument 03 is a carbon dioxide detector; the fourth gas monitoring instrument 04 is a hydrogen sulfide detector.
Specifically, the air inlet end of the first gas monitoring instrument 01 is connected with the air outlet of the oil-water filter 800 through a gas conveying pipeline seven 007, and the air outlet end of the first gas monitoring instrument 01 is connected with the air inlet end of the second gas monitoring instrument 02 through a first air guide pipe; the air outlet end of the second gas monitoring instrument 02 is connected with the air inlet end of the third gas monitoring instrument 03 through a second air guide pipe; the air outlet end of the third gas monitoring instrument 03 is connected with the air inlet end of the fourth gas monitoring instrument 04 through a third air guide pipe; the air outlet end of the fourth gas monitoring instrument 04 is connected with the air outlet 103 on the casing 100 through the air duct four.
The gas monitoring instrument module is characterized by further comprising a control module, wherein the signal output of the gas monitoring instrument module is connected with the signal input of the control module through an RS485 communication module, and the signal output of the control module is connected with the touch display screen 1000 through an RS232 communication module; the signal output of the gas monitoring instrument module is also connected with a terminal server through a 4-20mA communication module, and the signal output of the control module is respectively connected with the two-position three-way electromagnetic valve 300 and the control end of the air pump 500. The control module comprises a PLC controller, the signal output of the control module is connected with the two-position three-way electromagnetic valve 300 through a first relay, the two-position three-way electromagnetic valve 300 is controlled to be switched on in a time-sharing mode, the signal output of the control module is connected with the air pump 500 through a second relay, and the air pump 500 is controlled to work.
The touch display screen 1000 is an industrial-grade touch display screen, and the touch display screen 1000 can display the concentrations of various gas components monitored by the gas monitoring instruments.
The system also comprises an infrared receiver and an infrared remote controller. Through setting up infrared remote controller and infrared receiver, can be through infrared remote controller through explosion-proof glass window to instrument calibration, communication setting, set up functions such as gaseous kind selection, a key recovery. The explosion-proof shell does not need to be opened to carry out corresponding setting operation, the remote control function can be realized, and the operation is simpler and more convenient.
In this embodiment, a power supply for supplying power to the control module and the electrical devices is provided in the casing 100 (a power supply 107 and an air switch 108 are provided in the casing 100, which can ensure safe and stable operation of the circuit system), the casing 100 is provided with a power switch, and the casing 100 is made of an explosion-proof material. The shell 100 is made of explosion-proof materials, the whole shell is designed to be explosion-proof, safety is high, the explosion-proof shell is particularly suitable for industrial field environments with explosion-proof requirements, operation is simple, practicability is high, and the explosion-proof shell has high popularization and application values.
The working principle is as follows: the gas (marsh gas) after the purification of the biogas is connected to a gas inlet 102 to be monitored on the shell 100, the gas is subjected to pressure reduction and pressure stabilization control output through the two-stage pressure reducing valve 200 (the gas pressure is ensured in the normal pressure working range of the gas detection instrument by adjusting the two-stage pressure reducing valve 200), and the gas after the gas passes through the two-stage pressure reducing valve 200 is subjected to time-sharing control through the two-position three-way electromagnetic valve 300 (one channel of the two-position three-way electromagnetic valve is a calibration gas channel and belongs to a calibration air channel, the directly pumped air enters the electromagnetic valve, and the other gas. The two-position three-way solenoid valve 300 realizes time-sharing control through a PLC controller, so that the measurement gas and the air circularly enter a rear-end gas circuit. After being switched and controlled by the two-position three-way electromagnetic valve 300, gas enters the molecular sieve 400 to be filtered by water vapor, sulfide, impurity dust and the like, and then the gas flow rate of the whole gas circuit is controlled by the needle valve 700, so that the relative stability of gas flow is ensured, and then the gas enters the oil-water filter 800 through the air suction pump 500, the oil-water filter 800 can firstly pass oil and filter water, wherein the automatic water drainage function can be realized by the action of gravity when the water content is more. The safety valve 900 is arranged behind the oil-water filter 800, when the front-end pressure reducing system fails and high-pressure gas enters, the pressure relief function can be realized, and therefore the gas detector at the rear end is protected.
Then, the gas sequentially enters gas monitoring equipment such as a methane gas detector, an oxygen gas detector, a carbon dioxide gas detector, a hydrogen sulfide gas detector and the like, and finally the gas is discharged from an exhaust port 103 on the shell 100.
In this embodiment, the display of the four gas components can be displayed on an industrial-grade touch display screen through 485 communication, and the detection data can be transmitted to a terminal server (a background management center) through a 4-20mA communication mode. Through setting up infrared receiver on the PLC circuit, then through infrared remote controller, can see through the explosion-proof glass window and carry out corresponding operation. The infrared remote controller controls a display screen to move a cursor to perform corresponding software operation through keys such as an upper key, a lower key, a left key, a right key and the like. Therefore, functional operations such as calibration, setting and the like are carried out without disassembling the explosion-proof box, and corresponding operations can be carried out by field workers very conveniently.
The gas on-line monitoring device can be applied to the fields of biogas purification, biogas biomass power generation, landfill gas power generation, sewage treatment plants, petrochemical industry, coal mines and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. Biogas composition on-line monitoring device for high-pressure gas pipeline, including the inside gas monitoring instrument module of casing and casing, its characterized in that: the shell is provided with a calibration air inlet, a gas inlet to be monitored, an exhaust port and a water outlet, the gas inlet to be monitored is connected with a first inlet on the two-position three-way electromagnetic valve through a first gas conveying pipe, and the first gas conveying pipe is provided with a two-stage pressure reducing valve; the calibration air inlet is connected with the second inlet on the two-position three-way electromagnetic valve through a second gas conveying pipe, the outlet of the two-position three-way electromagnetic valve is connected with the inlet of the molecular sieve, the outlet of the molecular sieve is connected with the inlet of the oil-water filter through a suction pump, the gas outlet of the oil-water filter is connected with the gas inlet end of the gas monitoring instrument module, the water outlet of the oil-water filter is connected with the water outlet on the shell through a water discharging pipe, and the gas outlet end of the gas monitoring instrument module is connected with;
the gas monitoring instrument module comprises a plurality of gas monitoring instruments, the gas inlet end of a first gas monitoring instrument in the plurality of gas monitoring instruments is connected with the gas outlet of the oil-water filter, the gas outlet end of a last gas monitoring instrument in the plurality of gas monitoring instruments is connected with the gas outlet on the shell, and the gas inlet end and the gas outlet end of the gas monitoring instrument between the first gas monitoring instrument and the last gas monitoring instrument are sequentially connected in series through corresponding gas guide tubes.
2. The online monitoring device for the components of the biogas for the high-pressure gas pipeline according to claim 1, characterized in that: the molecular sieve is connected with the air pump through a gas conveying pipeline IV, a flow meter is arranged on the conveying pipeline IV, and a needle valve is arranged at an air inlet of the flow meter.
3. The online monitoring device for the components of the biogas for the high-pressure gas pipeline according to claim 2, characterized in that: and the gas outlet of the oil-water filter is connected with the gas inlet end of the gas monitoring instrument through a gas conveying pipeline seven, and a safety valve is arranged on the gas conveying pipeline seven.
4. The online monitoring device for the components of the biogas for the high-pressure gas pipeline according to claim 3, characterized in that: the gas monitoring instrument module comprises 4 gas monitoring instruments, the 4 gas monitoring instruments are respectively a first gas monitoring instrument, a second gas monitoring instrument, a third gas monitoring instrument and a fourth gas monitoring instrument, the gas inlet end of the first gas monitoring instrument is connected with the gas outlet of the oil-water filter through a gas conveying pipeline seven, and the gas outlet end of the first gas monitoring instrument is connected with the gas inlet end of the second gas monitoring instrument through a gas guide pipe I;
the air outlet end of the second gas monitoring instrument is connected with the air inlet end of the third gas monitoring instrument through a second air guide pipe;
the air outlet end of the third gas monitoring instrument is connected with the air inlet end of the fourth gas monitoring instrument through a third air guide pipe;
the air outlet end of the fourth gas monitoring instrument is connected with an air outlet on the shell through a fourth air guide pipe.
5. The online monitoring device for biogas components for a high-pressure gas pipeline according to any one of claims 1 to 4, characterized in that: the shell is provided with a communication interface and a power interface; the signal output of the gas monitoring instrument module is connected with the signal input of the control module through an RS485 communication module, and the signal output of the control module is connected with the touch display screen through an RS232 communication module; the signal output of the gas monitoring instrument module is also connected with a terminal server through a 4-20mA communication module, and the signal output of the control module is respectively connected with the two-position three-way electromagnetic valve and the control end of the air pump.
6. The online monitoring device for the components of the biogas for the high-pressure gas pipeline according to claim 5, characterized in that: the system also comprises an infrared receiver and an infrared remote controller.
7. The online monitoring device for the components of the biogas for the high-pressure gas pipeline according to claim 6, characterized in that: the shell is made of an explosion-proof material, a power supply for supplying power to the control module and the electrical appliance is arranged in the shell, and a power switch is arranged on the shell.
8. The online monitoring device for the components of the biogas for the high-pressure gas pipeline according to claim 4, characterized in that: the first gas monitoring instrument is a methane detector; the second gas monitoring instrument is an oxygen detector; the third gas monitoring instrument is a carbon dioxide detector; the fourth gas monitoring instrument is a hydrogen sulfide detector.
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