Waste boiler gasification device and method for recovering waste heat of dry pulverized coal

Abstract

A waste boiler gasification device for recovering waste heat of dry pulverized coal comprises a shell, wherein a combustion chamber and a radiation waste boiler which are communicated with each otherare arranged in the shell from top to bottom, an overhead combustor is installed at the top end of the combustion chamber, 2N side combustors are symmetrically installed on the two sides of the combustion chamber, and a slag opening is formed in the bottom of the combustion chamber; the radiation waste boiler is communicated with the lower end of the slag hole, a first-stage water cooling wall anda second-stage water cooling wall are separately arranged in the radiation waste boiler from inside to outside in parallel at intervals, wherein a cooling spray head is mounted below the first-stagewater cooling wall, and slag discharge holes are formed in the radiation waste boiler and the bottom of the shell; a synthesis gas outlet is formed in the side face of the upper portion of the radiation waste boiler and connected with a gas conveying guide pipe, and the other end of the gas conveying guide pipe communicates with the convection waste boiler. Based on the design of the radiation waste heat boiler and the convection waste heat boiler, the radiation waste heat boiler is formed by combining the two layers of water cooling walls with the rising secondary channel and the convection waste heat boiler, sensible heat of high-temperature synthesis gas can be recycled to the maximum extent, the heat utilization rate is high, and the process is simple.

Description

technical field [0001] The present application relates to the technical field of gasification furnaces, in particular to a waste boiler gasification device and method for recovering waste heat of dry coal powder. Background technique [0002] The efficient and clean utilization of coal is an inevitable strategic choice for sustainable economic and social development, and an important basis for ensuring stable and reliable energy supply and sustainable development. In the clean and efficient utilization of coal, coal gasification technology occupies a core position. Dry coal powder pressurized entrained bed gasification technology has become the mainstream technology in industrial operation due to its advantages such as wide adaptability of coal types, high gasification efficiency, and superior environmental protection performance. [0003] The dry coal gasification technology operating in the coal gasification market at this stage, common aerospace furnaces and Dongfang furn...

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Problems solved by technology

[0004] This application provides a waste boiler gasification device and method for recovering waste heat of dry coal powder. It adopts the design of radiant waste boiler plus cooling nozzle combined with convection waste boiler. The radiant waste boiler is designed as a two-stage water wall structure to increase the coal gasification process. The heat recovery rate in the middle solves the problems of complex process flow of the existing waste boiler gasification furnace, difficult maintenance of the waste boiler system, substandard cooling, and large investment; solves the problem that the existing gasification process cannot be designed for convection after radiating the waste boiler The problem of waste boilers, while recovering the sensible heat of high-temperature syngas to the greatest extent, can greatly reduce water consumption

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