Double-circulation fluidized bed two-section coupled powdered coal pressure gasification device and method

Abstract

The invention discloses a double-circulation fluidized bed two-section coupled powdered coal pressure gasification device and method and belongs to the technical field of coal gasification. The deviceis characterized by comprising two parts, namely a first section reactor and a second section reactor, wherein the first section reactor comprises a reaction system, a carbon-containing material recycling system and a returned material conveying system which are connected in a head to end manner; the second section reactor comprises a secondary reaction system, a fine ash capturing device and a returned material conveying system which are connected in the head to end manner; the first section reactor is connected with the second section reactor through a pipeline. The improved device is rapidin solid circulation velocity and gas circulation speed, large in treatment capacity, sufficient in reaction medium heat exchange, high in heat exchange efficiency, small in overall temperature difference of fluidized beds and large in coal type application range, that is, from low-rank coal to medium / high-rank coal which is rich in reserve in China, the contents of effective gas components and the carbon conversion rate in coal gases are increased, a generated synthesis gas is free of tar, and later gas purification can be relatively simple.

Description

technical field [0001] The invention belongs to the technical field of coal gasification, and in particular relates to a pulverized coal pressurized gasification device and method with two-stage coupling of a double circulating fluidized bed. Background technique [0002] China's resource endowment is more coal and less oil and gas. Coal has played an important role in my country's economic development, but its extensive use has also produced many negative effects. Coal gasification, as an important technology for coal conversion and utilization, has received more and more attention. However, the existing coal chemical technology has limited applicability of coal types, and has not been able to better solve the problems of large-scale, clean, and high-efficiency. At present, there are relatively large reserves of medium and high-rank coals in China. How to make the gasification technology only suitable for low-rank coals solve the problems of low carbon conversion rate, high...

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Problems solved by technology

At present, there are relatively large reserves of medium and high-rank coals in China. How to make the gasification technology only suitable for low-rank coals solve the problems of low carbon conversion rate, high methane content in syngas and coal tar in medium and high-rank coals Defects, increasing throughput and reducing energy consumption have become key issues

[0003] The circulating fluidized bed reactor has good adaptability to the lignite with high volatile content, large specific surface area, good activity and low degree of metamorphism, but for the gasification of other coal ranks in China, it has high content of tar, methane and dust particles. Fatal defects such as low carbon conversion rate limit the wide-scale application of circulating fluidized beds

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