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Method and system for on-line monitoring of gas in multi-channel air sampling type inspection shaft

An air sampling and monitoring system technology, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as inability to form online monitoring of gas pipeline leakage, difficulty in power supply to alarms, and no signal transmission function involved.

Active Publication Date: 2017-10-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent No. ZL 200420049717.7 discloses a monitoring system for real-time monitoring of natural gas leakage at inspection wells and uploading leakage information. Power supply is difficult and signal transmission is difficult, and the alarm is likely to be submerged in rainstorms, causing the alarm to be scrapped
Therefore, when monitoring all gas pipelines, it is necessary to excavate and lay a large area of ​​roads to solve the problems of power supply and signal transmission. In the actual installation process, the operation cost is very high and it is difficult to realize
[0005] Patent No. ZL 200920252054.1 discloses an air-breathing gas detection system, but this system is not aimed at gas pipeline network leakage detection based on detection of manholes, and does not involve signal transmission function, selection of manholes and air inlets The connection mode is optimized, and it is impossible to form a system for online monitoring of gas pipeline leakage in a large area

Method used

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  • Method and system for on-line monitoring of gas in multi-channel air sampling type inspection shaft
  • Method and system for on-line monitoring of gas in multi-channel air sampling type inspection shaft
  • Method and system for on-line monitoring of gas in multi-channel air sampling type inspection shaft

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Effect test

Embodiment 1

[0047] The multi-channel air sampling gas online monitoring system in the inspection well for monitoring gas leakage includes 5 gas inlets, a set of gas inlet expansion containers, gas filters, mechanical water and gas separators, suction pumps, and flow controllers , a dryer, a methane detector, an ethane detector, a street lamp power interface, a voltage converter, a signal collector, and a control center, wherein the gas inlet extends into the inspection well, and one end of the air inlet is connected to the suction funnel, The diameter of the funnel is less than 10cm, and the air inlet of the funnel is equipped with a plastic protective net with a mesh diameter of less than 2mm. The gas inlet and the air inlet expander are connected by a PE pipe with a diameter of 15mm. One end of the air inlet expander is connected to the mechanical gas filter with a PE pipe with a diameter of 15mm for gas, and the other end is connected to a 5-joint joint distributor to obtain 5 air inlet...

Embodiment 2

[0050] A multi-channel air sampling type gas online monitoring system for monitoring gas leakage, including 10 gas inlets, a set of gas inlet expanders, gas filters, mechanical water and gas separators, suction pumps, and flow control Devices, dryers, methane detectors, ethane detectors, street lamp power interfaces, voltage converters, signal collectors, and control centers, where one end of the gas inlet is connected to the suction funnel in the inspection well, and the diameter of the funnel is less than 10cm. The air inlet of the funnel is equipped with a plastic protective net, the mesh diameter is less than 2mm, and the gas inlet is connected to the expansion container of the air inlet with a PE pipe with a diameter of 15mm for gas. One end of the air inlet expander is connected to the mechanical gas filter with a PE pipe with a diameter of 15mm for gas, and the other end is connected to a joint distributor with 2 joints. Connect the connector distributor to get 10 inlet...

Embodiment 3

[0053] A multi-channel air sampling type gas online monitoring system in the inspection shaft for monitoring gas leakage, including 20 gas inlets, a set of gas inlet expansion containers, gas filters, electric water and gas separators, suction pumps, and flow control device, dryer, methane detector, ethane detector, street light power interface, voltage converter, signal collector, control center, wherein the gas inlet extends into the inspection well, and one end of the inlet is connected to the suction funnel, The diameter of the funnel is less than 10cm. The air inlet of the funnel is equipped with a plastic protective net. The mesh diameter is 1mm. Connect the PE pipe to the mechanical gas filter, and connect the other end to a 4-joint joint distributor, and then connect the 4-joint joint distributor to four 5-joint joint distributors to obtain 20 inlet joints and The air inlet is connected. The diameter of the mechanical gas filter is less than 10cm, and the diameter of ...

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Abstract

The invention provides a multi-channel air sampling type gas online monitoring system and method in an inspection well. Among them, the method includes: the gas acquisition system collects the gas in the inspection well; the gas processing system preprocesses the collected gas in the inspection well; the gas testing system monitors the concentration information of the pretreated gas in the inspection well; The concentration information of the gas, and generate the data information of the gas in the inspection shaft according to the concentration information; and the control center receives the data information of the gas in the inspection shaft sent by the signal acquisition system, and judges whether the gas pipeline is leaking according to the data information of the gas in the inspection shaft. The multi-channel air sampling type inspection well gas online monitoring method of the embodiment of the present invention can realize real-time monitoring of gas pipeline leakage in cities.

Description

technical field [0001] The invention relates to the technical field of gas safety, in particular to a method and system for on-line monitoring of gas in a multi-channel air sampling type inspection shaft. Background technique [0002] Most of the gas pipelines in the city are arranged underground, and the gas pipeline is surrounded by a soil layer. When the gas leaks out of the gas pipe, the gas will diffuse into the surrounding space through the soil layer. For gas diffusion caused by microcracks, the amount of gas leakage is limited, so high-pressure jet airflow will not be formed, and the leaked gas will slowly diffuse through the soil layer. If the leaked gas is to reach the explosion limit, there must be a space for it to accumulate gradually, and the space around the gas pipeline network is mainly adjacent pipeline networks, such as sewage pipeline networks, and the leaked gas will spread to adjacent sewage pipeline networks In the process, since the current pipelines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D5/02
Inventor 袁梦琦钱新明侯龙飞纪庭超黄平刘振翼
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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