Two stage type dry coal powder entrained flow gasifier

Abstract

The invention discloses a two-section dry coal dust air-fluidized bed gasifier, of which the external wall is a right cylinder and the internal structure is composed of an upside main gasification chamber and a downside shock chamber. The gasifier is characterized in that: upper layer nozzles and lower layer nozzles are respectively arranged at different horizontal levels in the main gasificationchamber; spraying nozzles of shock water are arranged at the upper part of the shock chamber; the nozzles of all layers all center around the center of the horizontal section where the nozzles are located, at least two nozzles are distributed along a circumferential circle and the rotation directions of the nozzles at all layers are the same; in the shock chamber, a taphole is arranged at the bottom part of the shock chamber and a syngas outlet is arranged on the side wall of the shock chamber. The gasifier realizes the spatialization of gasification. The average temperature in the gasifier is high with an even temperature field. The slagging temperature in the gasifier can be over 50 DEG C higher than ash fusion point and ash residue can be discharged smoothly in liquid, thus realizing the safe and highly effective gasification of high ash fusion point coal.

Description

technical field [0001] The invention relates to a gasification device, more specifically a two-stage dry coal pulverized entrained bed gasifier. Background technique [0002] Clean coal technology has become a major key technology for my country's coal chemical industry, industrial gas and power industry technology upgrades, and coal gasification technology is one of the important directions of clean coal technology, and is the most important in the chemical system with coal-based energy. Core Technology. So far, there are dozens of industrialized coal gasification processes in the world, which can be classified into three categories: fixed bed gasification process represented by Lurgi; gasification process represented by HTW (High Temperature Winkler) and ash fusion Fluidized bed gasification process, and entrained bed gasification process represented by Texaco, Shell, GSP. [0003] Coal-to-syngas (or H 2 ) gasification technology is generally recognized as the entrained ...

AI Technical Summary

Problems solved by technology

This gas upward method can use the material injected into the upper furnace to reduce the temperature of the outlet gas, promote the solidification and separation of the slag in the gas, avoid the blockage of the subsequent gas cooler, and reduce the heat exchange area and quantity of the cooler. However, if it is applied to the gasification of coal with high ash melting point, because the way of gas upward and slagging downward does not make full use of the good carrying effect of gas on liquid slag, it is easy to cause poor slag discharge at the slag outlet; moreover, on it Only two opposite nozzles are symmetrically arranged in the furnace, and the spatial uniformity and temperature field uniformity of the material reaction in the upper furnace cannot be guaranteed

[0009] Chinese Patent Application No. CN01134311.7 proposed "A Novel Dry Coal Pulverized Air-flow Bed Pressurized Gasifier" also divides the gasifier into the first gasification chamber of the upper section and the second gasification chamber of the lower section, but the feeding method A single nozzle of raw coal and gasification agent is installed on the top of the gasification furnace. During the gasification process, there will be an obvious downward jet of flame, which will cause a high local temperature field and a large temperature gradient in the furnace.

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