Double-tangential-circle two-section-type dry pulverized coal gasifying furnace and gasifying method thereof

Abstract

The invention discloses a double-tangential-circle two-section-type dry pulverized coal gasifying furnace and a gasifying method thereof. A plurality of first section burners are uniformly arranged onthe wall surface of a first section reaction chamber, the first section burners are communicated with the first section reaction chamber, the center of the first section reaction chamber is correspondingly provided with a first imaginary circle, the central lines of all of the first section burners are tangent to the first imaginary circle, and first imaginary circles which are formed by the jetted out air flows of the first section burners are rotated in the same direction; a plurality of second section burners are uniformly arranged on the wall surface of a second section reaction chamber,the second section burners are communicated with the second section reaction chamber, the center of the second section reaction chamber is correspondingly provided with a second imaginary circle, thecentral lines of all of the second section burners are tangent to the second imaginary circle, and the rotary directions of second imaginary circles which are formed by the jetted out air flows of thesecond section burners are opposite to the rotary directions of the first imaginary circles. By means of the furnace and the method, a more uniform furnace inner flow field and higher slag capturingrate and carbon converting rate can be obtained.

Description

Technical field [0001] The invention belongs to the technical field of coal gasification, and specifically relates to a double tangent circle two-stage dry coal powder pressurized gasifier and a gasification method thereof. Background technique [0002] Coal gasification technology is one of the core technologies for the clean and efficient utilization of coal. The industrialized coal gasification technologies mainly include fixed bed gasification, fluidized bed gasification and entrained bed gasification. Entrained-flow coal gasification technology has the characteristics of high gasification parameters, large gasification capacity, high performance indicators, good environmental performance, and wide adaptability of coal types. It represents the development direction of large-scale coal gasification technology. The two-stage dry pulverized coal pressurized gasification technology is one of the representative technologies of entrained bed gasification technology, and has been su...

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Problems solved by technology

[0003] In the prior art, there is a short-circuit air flow in the impingement flow field in the gasifier, and the carbon particles in the furnace are not fully reacted, which easily causes a certain amount of carbon loss, thereby reducing the carbon conversion rate of the gasifier

At the same time, due to the absence of oxygen in the second-stage reaction of the gasifier, the reaction temperature and reaction rate of pulverized coal pyrolysis and gasification reaction are low, and a certain amount of ammonia nitrogen will be generated in the reaction, which will lead to an increase in the amount of ammonia nitrogen in the gasification ash water. Increased the difficulty of the sewage treatment system

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