Shunting type coal gas flow measurement device and measurement method thereof

Abstract

The invention relates to a shunting type coal gas flow measurement device and a measurement method thereof. The shunting type coal gas flow measurement device mainly comprises a horizontal pipe, a liquid collection box, a coal gas collection box, a pressure transmitter, a coal gas flowmeter, a temperature transmitter and a computer. When coal gas flows through the horizontal pipe, natural separation phenomenon occurs because of the action of gravity, liquid and solid impurities in the coal gas are deposited towards the bottom of the pipe, dry coal gas are gathered on the upper part of the horizontal pipe, a part of the coal gas is further purified and enters a shunting measurement circuit, corresponding measurement signals are obtained and the coal gas returns to the horizontal pipe, the corresponding measurement signals are immediately transmitted to a coal gas flow export module in the computer, and total flow of the dry coal gas is finally obtained. In addition, the liquid and solid impurities in the coal gas are collected into the liquid collection box through a porous wall of the lower part and discharged to a recovery system through a liquid discharge valve. The invention can greatly reduce the volume of the measurement device, simplify a separation method, improve real-time property of measurement, automation degree and measurement accuracy and facilitate the widespread application of the measurement device and method in engineering.

Description

Technical field [0001] The invention belongs to the technical field of gas flow measurement, and specifically relates to a split gas flow measurement device and a measurement method thereof. Background technique [0002] At present, the traditional gas flow measurement method is to directly use a gas flow meter to measure, but because the gas often contains a certain amount of water, especially the coal gas produced by the gasification coal mining process, there are also some solid particles and tar. These liquids Solid impurities will interfere with the normal operation of the flowmeter, causing the measurement error of the conventional flowmeter to increase sharply, or even fail to work at all. In order to solve this problem, the general method is to use separation and purification method, that is, first use a separation device or purification device to separate the liquid and solid impurities in the gas, and then use a single-phase flowmeter to measure the flow of the gas. Th...

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Problems solved by technology

However, this method lacks an effective device and method for removing impurities. If it is applied to gas measurement, the impurities in the gas will quickly block the sampling port of the sampling tube, making the measurement invalid.

At the same time, due to the lack of a throttling device on the pipeline, there is a certain randomness in the gas flow entering the sampling pipe, which will reduce the calculation accuracy of the total flow, so this method is not suitable for measuring gas

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