Cascade modular entrained bed gas preparation system

Abstract

The invention provides a cascaded modular entrained bed gas preparation system, comprising: a sequentially connected coal feeding unit, a gasification unit, a collection unit, and a heat treatment unit, the collection unit includes a first gas outlet; the heat treatment unit includes a sequentially connected steam Superheater, evaporator and economizer; the collection unit communicates with the gas inlet of the steam superheater through the first gas outlet; it also includes the first steam drum, the water outlet of the economizer communicates with the water inlet of the first steam drum, and the second The water outlet of the first steam drum communicates with the water inlet of the evaporator, the steam outlet of the evaporator communicates with the steam inlet of the first steam drum, and the steam outlet of the first steam drum communicates with the steam inlet of the steam superheater. The invention is suitable for a medium-low pressure entrained bed gas preparation system. Since the heat exchange structure adopts a shell-and-tube heat exchange structure, the cooling water will not be polluted, and waste heat can be recovered and utilized in stages.

Description

technical field [0001] The invention relates to a cascaded modular entrained bed gas preparation system, which belongs to the technical field of coal gasification. Background technique [0002] As my country's modernization level continues to improve, people's demand for energy is also increasing, and my country is a country rich in coal and poor in oil and gas. Therefore, how to use coal cleanly and efficiently has become a major technical issue in the field of energy and environmental protection in my country, and it is also one of the key technologies for the sustainable development of my country's national economy and society. [0003] Coal gasification refers to putting coal into the reaction chamber through conveying equipment. Under certain temperature and pressure conditions, a series of chemical reactions occur between the organic matter in the coal and the gasification agent (such as steam, oxygen), etc., and the solid coal is converted into Contains CO, H 2 Comb...

AI Technical Summary

Problems solved by technology

Because this method uses water for quenching, direct contact between water and ash will cause a large amount of clean water to be polluted, and even if the water purification system is added later, the equipment cost and operating cost will be greatly increased

At the same time, the gasification pressure of 3Mpa to 6Mpa will cause the delivery pressure to be too high when feeding, and the intermediate pipeline from the syngas to the user needs to add a decompression device to meet the needs of the user

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