A gasification production method of high calorific value synthesis gas and a device for realizing the method

Abstract

The invention relates to a gasification production method of high calorific value synthesis gas, comprising the following steps: (1) passing raw materials through a gasification circulation chamber arranged inside the reaction vessel of the gasification device into a drum arranged inside the reaction vessel of the gasification device The bubbling combustion chamber is used for combustion heating, and part of the heat released by combustion in the bubbling combustion chamber heats the unburned raw material particles in the bubbling combustion chamber to above 900°C, and the raw material particles heated to above 900°C are sent into the fluidization gasification chamber; (2) The fluidization gas is passed into the fluidization gasification chamber from the bottom of the reaction vessel of the gasification device to gasify the raw material particles, and the ungasified raw material particles circulate into the bubbling combustion under the action of the baffle plate set in the gasification circulation chamber The chamber is reheated, and the gasified syngas is discharged through the syngas discharge port, and the remaining heat is recovered by the waste heat recovery device. In the synthesis gas production process of the invention, the gasification agent is mainly superheated steam, the nitrogen in the synthesis gas is small, and the calorific value of the coal gas is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of synthesis gas gasification, and in particular relates to a gasification production method of high calorific value synthesis gas and a device for realizing the method. Background technique [0002] Currently, there are three main types of industrial coal gasification processes: fixed bed gasification, fluidized bed gasification and entrained bed gasification. Fixed bed gasification must use lump coal (6-50mm). The coal and the gasification agent flow in countercurrent. In order to prevent the ash sintering in the gasification process, the amount of steam is large, which causes a large consumption of sensible heat in the wet gas. In addition, the dry distillation product in the gas is not gasified, which will reduce the efficiency of coal gasification and increase the investment in crude gas purification equipment. and energy consumption. This type of gasification has a small single furnace capacity and ...

AI Technical Summary

Problems solved by technology

If the entrained bed uses high-temperature steam and pure oxygen as the gasification agent, it can obtain gas with a higher calorific value, but the production scale required by the entrained bed is large, and a large amount of energy is consumed for milling, and energy is also consumed for making pure oxygen or enriched oxygen

In order to meet various specifications and at the same time reduce energy consumption as much as possible in the production process, in order to solve the shortcomings of various gasification processes, many new gasification processes have been proposed, such as the use of ash fusion fluidized bed gasifier To adapt to coal with high ash content and high ash melting point; adopt two-stage entrained flow bed process to reduce the temperature of crude gas and increase CH 4 The content of light hydrocarbons and the low calorific value of synthetic gas, but it is not conducive to chemical synthesis. This process needs to control the reaction temperature of the second stage, which is easy to produce coal tar

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