Method for producing coal tar and synthesis gas from oil-rich coal through pyrolysis and gasification coupling device and oil gas purification device

Abstract

The invention discloses a method for producing coal tar and synthesis gas from oil-rich coal through a pyrolysis and gasification coupling device and an oil gas purification device. Oil-rich coal serves as the raw material, pyrolysis gas and rough synthesis gas are obtained through the pyrolysis and gasification coupling device firstly, and the two gases are collected respectively in one device; then, specific to the problems of difficult oil and gas separation, the low coal tar recovery rate and much produced waste water, the oil and gas purifying device is arranged, the coal tar is recovered in a dust and heat recovery mode, an oil gas separation mode, an oil solid separation mode and a low-temperature oil gas separation mode, a coal tar product is obtained, the recovery rate of the coal tar is increased, and the waste water discharging amount in the separation process is reduced. Meanwhile, the synthesis gas is further purified through units of transforming, low-temperature methanol washing and the like, and a synthesis gas product is obtained.

Description

technical field [0001] The invention belongs to a method for simultaneously preparing coal tar and synthesis gas, in particular to a method for producing coal tar and synthesis gas from oil-rich coal using a pyrolysis gasification coupling device and an oil gas purification device. Background technique [0002] At present, fixed bed gasification technology is widely used in the production of coal tar and synthesis gas, which has the advantages of wide selection of coal types, high gasification rate, and low oxygen consumption. However, since the synthesis gas and coal tar gas produced by this technology are directly mixed and sent out from the gasification unit, the subsequent separation and purification treatment becomes more difficult. Moreover, since the synthesis gas contains a large amount of tar and phenolic ammonia components, the effective gas content in the synthesis gas is reduced, and at the same time, it is difficult to separate oil and gas, the recovery rate of ...

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Problems solved by technology

However, since the synthesis gas and coal tar gas produced by this technology are directly mixed and sent out from the gasification unit, it makes the subsequent separation and purification treatment more difficult

And because the synthesis gas contains a large amount of tar and phenolic ammonia components, the effective gas content in the synthesis gas is reduced, and at the same time, it is difficult to separate oil and gas, the recovery rate of tar is low, and a large amount of waste water will be generated during the separation process.

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