Combined Coal Gasification and Combustion Fluidized Bed-Powdered Coal Furnace in Series

Abstract

The invention discloses series-connected compounded gas gasification and combustion fluidized bed-pulverized coal furnace, relates to a fluidized bed-pulverized coal furnace, and aims to solve the problem that two fuels cannot be combusted at the same time, the low-load stable combustion is difficult, a specific pulverized furnace has poor adaptability to coal types and the power consumption of a coal mill is high when the fuel particles and the combustion activities of the conventional pulverized coal furnace are different. The series-connected compounded gas gasification and combustion fluidized bed-pulverized coal furnace comprises a pulverized coal suspension combustion chamber, a water cooling wall, a combustion fluidized bed, a gasification fluidized bed and an overflow pipe, wherein the combustion fluidized bed and the gasification fluidized bed are positioned on the lower side of an ash cooling hopper in the pulverized coal suspension combustion chamber; the gasification fluidized bed is completely separated from a furnace hearth through the water cooling wall; the gasification fluidized bed is communicated with the combustion fluidized bed through the overflow pipe; the combustion fluidized bed is separated from the furnace hearth by staggered pipe bundles, so that the gasification fluidized bed, the combustion fluidized bed and the pulverized coal suspension combustion chamber are connected in series. The series-connected compounded gas gasification and combustion fluidized bed-pulverized coal furnace is used for high-efficiency combustion of a coal-fired boiler.

Description

technical field [0001] The invention relates to a fluidized bed-coal powder furnace, in particular to a series compound coal gasification and combustion fluidized bed-coal powder furnace. Background technique [0002] Pulverized coal suspension combustion technology is a combustion technology that uses pulverized coal as fuel and has the advantages of rapid combustion, large capacity, high efficiency, and easy control and adjustment. This technology is very mature and is most widely used in power plant boilers. The structure of the existing pulverized coal furnace is as follows Figure 4 shown. The coal particles used in the pulverized coal furnace have a diameter of about 0.05 mm to 0.1 mm, and are prepared by a pulverized coal pulverization system. The pulverized coal boiler has the following disadvantages: low load stable combustion is difficult, the specific pulverized coal boiler has poor adaptability to coal types, and the power consumption of the coal mill is high. ...

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Problems solved by technology

[0004] The invention aims to solve the problems that when the fuel particle size and combustion activity of the existing pulverized coal furnace are different, the two fuels cannot be burned at the same time, it is difficult to burn stably at low load, the specific pulverized coal furnace has poor adaptability to coal types, and the power consumption of the coal mill is high. , and then provides a series compound coal gasification and combustion fluidized bed-coal furnace

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