Recovery system and recovery method of low-order coal pyrolysis oil gas

Abstract

The invention provides a recovery system of low-order coal pyrolysis oil gas. The recovery system comprises a cyclone dust collector, a filter dust collector, washing equipment, an electrical tar precipitator, adsorption equipment and a desulfurizing tower, wherein the washing equipment comprises an ammonia water storage tank, a tar washing tank and a gas-liquid contact vertical pipe which is positioned above the tar washing tank; the adsorption equipment is internally filled with one or more of pyrolytic semi-cokes, cokes, sawdust, granular activated carbon, activated carbon fiber, silica gel, activated aluminum oxide and molecular sieve. According to the recovery system provided by the invention, a dynamic wave washer is adopted, the structure is simple, the manufacturing cost is low, the energy consumption is low, the operation flexibility is large, and the gas-liquid mass transfer effect is good; due to the additional arrangement of a soft connecting pipe wall and a vibrator / an oscillator, the situation that a pipeline is blocked as tar is condensed on the pipe wall can be effectively avoided; through an oil gas product recovery technology adopted by the invention, and by arranging a hydrogen sulfide adsorption device and a dewatering device, hydrogen sulfide and water vapor in pyrolysis gas can be adsorbed, and the problems that due to the condensation of tar mist, VOCs (Volatile Organic Compouns) and the water vapor in the pyrolysis gas, pipeline equipment is corroded, and long-distance transportation requirements are difficult to meet are effectively solved.

Description

Technical field [0001] The invention relates to a method and system for separating pyrolysis products of low-rank coal. Background technique [0002] Low-rank coal contains abundant oil and gas resources, and high-temperature pyrolysis oil and gas and semi-coke can be obtained after pyrolysis. But the tar content in high temperature coal pyrolysis oil and gas is 50~200g / Nm 3 , Fly ash content 5~20g / Nm 3 , Sulfur content 5~40g / Nm 3 , Water vapor content 100~450g / Nm 3 , Has brought huge difficulties to the comprehensive utilization of oil and gas resources. High-concentration tar and fly ash will condense and block pipelines and equipment; high-concentration fly ash will be condensed with the tar, resulting in a decline in tar quality; 2 The presence of acidic gases such as S will corrode pipelines and equipment; the presence of water vapor causes the volume of pyrolysis gas to increase, which increases the burden of fan transportation and so on. At present, the common processes i...

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Problems solved by technology

[0006] Aiming at the problems of high dust content and low quality of tar in low-rank coal pyrolysis oil and gas in the prior art, as well as the difficulty in purifying tar droplets, VOCs and water vapor, and sulfur-containing components in pyrolysis gas, the present invention The purpose of this paper is to propose a complete pyrolysis oil gas recovery method and system to obtain high-quality ash-free tar and pure pyrolysis gas

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