Coal mine light concentration mash gas safety conveying method and conveying system

Abstract

The invention relates to a safe transferring plan and transferring system used for transferring a low-concentration gas in a coal mine. The invention is characterized in that water continuously flows around an inner wall of a ground positive-pressure gas transferring pipeline to form an annular flow, and the low-concentration gas flows in an annular water seal formed by the annular flow, and the gas flow is obstructed by a column water-group arranged at intervals on the gas transferring direction to form an end-face water seal of the gas, then the low-concentration gas forms an intermittent plunger gas flow in the annular water flow and the end-face water seal. The arrangement of the transferring system of the invention is comparatively simple and is easy for operation, and the energy-cost is low and the gas-supply pressure is stable, and the rest gas can be dispelled automatically, so as to guarantee that the extracting pump can work normally with a safe and reliable capability and abetter dehydration effect.

Description

technical field [0001] The invention relates to a safe delivery method and a delivery system for gas, more specifically to a safe delivery method and a delivery system for low-concentration gas used for effective utilization of low-concentration gas in coal mines. Background technique [0002] Coal mine gas has always been a major hidden danger in coal mine safety production, and it is also an associated resource and clean energy in coal fields. Gas drainage is the fundamental way to control coal mine gas disasters. Scientifically and rationally controlling, exploiting and utilizing coal mine gas can not only reduce coal mine gas disasters and accidents, but also turn harm into treasure and create economic value. [0003] The control, mining and utilization of coal mine gas require safe transportation of gas, and low-concentration gas is even more difficult to transport safely. [0004] Because gas with a concentration range of 5% to 16% has an explosion hazard, it is usual...

AI Technical Summary

Problems solved by technology

[0007] 1. The dehydration effect directly affects the power generation efficiency. It is relatively difficult to transport and dehydrate the fine water mist safely. In practical applications, condensed water still exists after secondary dehydration. Refrigeration and cyclone dehydration can solve the problem theoretically, but the system is too complicated

[0008] 2. Low-concentration gas may be in the explosion range during transportation, and it is strictly forbidden to build tanks for buffer storage. However, due to the mismatch between the extraction volume of gas extraction pumps and the utilization volume of gas utilization facilities, in practical applications, the excess The release of gas and the need to ensure the gas supply pressure of gas utilization facilities cannot be coordinated with each other

[0009] 3. The nozzle for the safe delivery of fine water mist determines the atomization effect, but because the condensed water in the coal mine gas pipeline contains calcium ions, it is easy to cause fouling of the nozzle, block the nozzle, and affect the atomization effect. In severe cases, the fine water mist will fail

[0010] 4. The disc flame arrester is used for the safe transportation of fine water mist to prevent fire. Its passage gap is small, and the resistance loss is large during normal use. Once fouling or dust is blocked, the system will fail

However, the actual application of the system is quite complicated, and it needs to be equipped with waste heat water steam system and waste heat refrigeration system, and there must be sufficient water vapor and electric refrigeration devices before the gas generating set starts operation.

There are currently no practical examples

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