A method for combusting coal gasification semi-coke particles using thick and thin thick and fine depth separation and controllable vortex stable combustion technology

Abstract

A method for burning gasified semi-coke particles by concentrated-dilute and coarse-fine deep separation and controlled vortex stable combustion technologies is characterized in that low-rank coal primary air semi-coke powder flow carrying gasified semi-coke is subjected to concentrated-dilute separation to obtain concentrated-phase semi-coke powder flow and dilute-phase semi-coke powder flow; the concentrated-phase semi-coke powder flow is subjected to coarse-fine separation to obtain concentrated-phase coarse semi-coke powder flow and concentrated-phase fine semi-coke flow; the dilute-phase semi-coke powder flow and secondary air are mixed, and the mixture is guided into an outer-layer nozzle of a combustion chamber; and the concentrated-phase fine semi-coke powder flow and the concentrated-phase coarse semi-coke powder flow are guided into an inner-layer nozzle and an intermediate-layer nozzle of the combustion chamber respectively and then sprayed into the combustion chamber, a controlled vortex bluff body device and an auxiliary aeration secondary air nozzle are mounted in the inner-layer nozzle of the combustion chamber, and during ignition, the concentrated-phase fine semi-coke powder flow sprayed by the inner-layer nozzle of the combustion chamber is ignited at first. The method can effectively improve ignition, combustion and burn-out characteristics of gasified semi-coke, reduces pollutant discharge and can effectively prevent a furnace wall from slag-bonding and a water wall from high-temperature corrosion.

Description

technical field [0001] The invention relates to a combustion method of gasified semi-coke particles produced by gasification of low-order coal, in particular to a method for burning coal gasification semi-coke particles by adopting the separation of density, thickness, depth and controllable vortex combustion stabilization technology. Background technique [0002] Although my country has abundant coal reserves, the proportion of low-rank coal in production is very high, close to 50%. According to statistics, the geological reserves of low-rank coal resources such as lignite, long-flame coal, non-caking coal, etc. have reached more than 500 billion Ton. For a long time, the low-rank coal pyrolysis gasification technology based on circulating fluidized bed gasification has provided a possibility to realize the efficient and clean utilization of coal resources, but a large number of semi-coke particles produced after pyrolysis need to be burned through combustion. way of recycl...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects such as difficulty in igniting and burning out of solid product gasification semi-coke after low-rank coal gasification, and provide a technology for high-efficiency, stable and clean combustion of low-rank coal gasification semi-coke before combustion and during combustion and methods

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