Coal gas temperature and pressure reducing device

Abstract

The invention provides a coal gas temperature and pressure reducing device which comprises a device body, a front baffle, a rear baffle, a water inlet and a water outlet. The device body comprises a coal gas inlet and a coal gas outlet, the front baffle and the rear baffle are transversely clamped inside the device body, a temperature and pressure reducing area is formed between the front baffle and the rear baffle, the water inlet is formed in the side wall of one side of the device body, the water inlet is located below the front baffle in the vertical direction, the water outlet is formed in the side wall of the side, opposite to the water inlet, of the device body, multiple single-hole pressure reducing plates are fixed to the front baffle, and a heat exchange pipe is arranged betweenevery two adjacent single-hole pressure reducing plates. Synchronous temperature and pressure reducing can be achieved for coal gas, the water content of coal gas in the cooling process can be effectively reduced, the phenomena such as equipment corrosion are avoided accordingly, the output coal gas purity is improved, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the technical field of gas engineering, in particular to a gas temperature and pressure reduction device. Background technique [0002] Gas-steam combined cycle power generation unit technology (CCPP), mainly pressurizes natural gas or other combustible gas through a gas compressor, mixes and combusts with the air sent to the combustion chamber under pressure to generate high-temperature, high-pressure gas, and then passes through gas permeation The flat machine expands to do work, pushing the gas turbine to drive the compressor and the external load to rotate at high speed: then the exhaust gas discharged from the gas turbine is led to the waste heat boiler to generate high-temperature and high-pressure steam to drive the steam turbine, which together with the gas turbine drives the generator to generate electricity. Its gas-to-electricity conversion rate is in the range of 40% to 50%, which is about 70% higher than convention...

AI Technical Summary

Problems solved by technology

At present, the gas bypass desuperheater and pressure reducer mainly rely on foreign imports, which are expensive and difficult to maintain

Domestic gas coolers are mostly shell-and-tube heat exchangers, with limited processing capacity, and cannot realize the functions of cooling and decompression at the same time, and it is difficult to meet the requirements of CCPP unit operation

Some foreign manufacturers adopt multi-stage water spray cooling technology. Although it can realize the function of temperature reduction and pressure reduction at the same time, it will cause the moisture content of the treated gas to increase, and the gas with a large moisture content will eventually cause damage to the inner wall of the container or steel pipe. Corrosion is not conducive to the subsequent use of gas, and it is accompanied by sewage

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