Telescopic multi-fuel circulation-bubbling combined fluidized bed boiler
A fluidized bed and bubbling bed technology is applied in the field of sleeve-type multi-fuel cycle-bubbling combined fluidized bed boilers, which can solve the problems of insufficient utilization of waste heat and large heat loss, achieve directional transfer and reduce emissions Effect
Inactive Publication Date: 2018-11-30
HARBIN UNIV OF SCI & TECH
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Problems solved by technology
However, at present, the fluidized bed boiler is still limited to single-bed combustion, mainly burning a single fuel, and its heat loss is relatively large, and the waste heat after fuel combustion cannot be fully utilized
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[0015] A sleeve-type double-cycle multi-fuel combined fluidized bed boiler, the working principle is as follows:
[0016] 1. Circulating fluidized bed:
[0017] The coal enters the circulating fluidized bed through the feed port 1, and the air is sent in from the bottom by the blower through the air distribution plate. The coal and the air are mixed and burned, and a large amount of reaction heat is released. The main chemical reactions that occur are:
[0018]
[0019]
[0020]
[0021]
[0022] The above reactions are all exothermic reactions, and the reaction temperature is 800-950°C. The heat generated by coal combustion is transferred to the bubbling fluidized bed to provide energy (heat source) for the gasification of biomass. Under the action of the cyclone separator, the generated flue gas is discharged from the exhaust port at the top of the riser, while the unburned carbon particles and bed material are sent back to the circulating fluidized bed for re-co...
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The invention discloses a telescopic multi-fuel circulation-bubbling combined fluidized bed boiler. According to the telescopic multi-fuel circulation-bubbling combined fluidized bed boiler, circulation and bubbling fluidized beds are combined through nesting. Fluidized beds of the telescopic multi-fuel circulation-bubbling combined fluidized bed boiler comprise a circulating fluidized bed and a bubbling fluidized bed; the telescopic multi-fuel circulation-bubbling combined fluidized bed boiler can be used for simultaneous of coal granule combustion and biomass gasification on different fluidized beds; direct heat transfer between the two fluidized beds is realized; the external part of the bubbling fluidized bed is provided with a water cooled wall, so that energy transmission and productinsolating effects are achieved, and in addition, product occupied space area is reduced; combustible gas generated through biomass gasification can be collected and recycled; and no oxynitride is precipitated under biomass gasification conditions. The telescopic multi-fuel circulation-bubbling combined fluidized bed boiler is capable of solving problems in the prior art that, in single fuel combustion of circulating fluidized bed boiler, full utilization of waste heat is impossible to realize, and environment pollution is caused by oxynitride discharge.
Description
technical field [0001] The invention relates to the technical field of fuel gasification and combustion, in particular to a sleeve-type multi-fuel cycle-bubbling combined fluidized bed boiler. Background technique [0002] At present, the gasification technologies that have been industrialized mainly include fixed-bed gasification technology, fluidized-bed gasification technology, and entrained-bed gasification technology. Among them, the fixed bed gasification technology is the simplest and most widely used, but the fixed bed is difficult to adapt to the large fuel processing capacity and the production scale is small; most of the raw materials use high-quality lump coal, which undoubtedly increases the fuel cost; the gasification temperature is low, It is easy to cause problems such as secondary pollution such as phenol water, and the pressure on environmental protection is relatively high, which cannot meet the national environmental protection requirements; [0003] In ...
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IPC IPC(8): F23C10/00F23C10/10F23C10/22F23C10/26F23C10/18F23C10/28
CPCF23C10/005F23C10/10F23C10/18F23C10/22F23C10/26F23C10/28
Inventor 陈巨辉韩坤张宗云李铭坤宋美琪陈纪元马明
Owner HARBIN UNIV OF SCI & TECH