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Furnace front coal head-drawing method for circulating fluid bed boiler

A technology of circulating fluidized bed and coal in front of the furnace, which is applied in the field of coal pyrolysis, can solve the problems of not being very applicable, and achieve the effect of making full use of energy

Active Publication Date: 2009-05-20
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for occasions that do not require hot water, steam and semi-coke, the above two methods are not very suitable

Method used

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  • Furnace front coal head-drawing method for circulating fluid bed boiler

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Embodiment

[0029] A coal topping device is installed in front of the circulating fluidized bed boiler, and all the boiler feed coal A is first put into the coal topping pyrolysis chamber 1 for pyrolysis reaction, and then sent to the circulating fluidized bed boiler furnace 7 for combustion.

[0030] Coal A with a particle size of 0-8mm is added from the upper part of the coal topping pyrolysis chamber 1, and the pyrolysis reaction is carried out to produce semi-coke G and pyrolysis gas B containing tar, which is discharged from the upper part of the pyrolysis chamber 1, finely The fine powder F separated from the pyrolysis gas B by the powder separator 6 is sent to the hearth 7 of the circulating fluidized bed boiler; the semi-coke G is discharged from the bottom of the pyrolysis chamber 1, and most of the semi-coke G is sent into the bottom feeder 2 The lower part of the circulating fluidized bed boiler hearth 7 is used as boiler coal feed, and a small part of semi-coke G is sent into t...

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Abstract

The invention discloses a method for topping boiler-front coal for a circulating fluidized bed boiler, and relates to pyrolysis technology of coal. The method comprises the following steps: arranging a pyrolysis gasification device for a solid heat carrier in the front of the circulating fluidized bed boiler, feeding partial or full coal supplied to the circulating fluidized bed boiler into the device, and topping the coal to generate pyrolysis gas and tar; and feeding part of semi-coke into a hearth of the circulating fluidized bed boiler to combust, and feeding the other part of the semi-coke into a coal topping combustion chamber to combust; and introducing smoke gas in the coal topping combustion chamber into the hearth of the circulating fluidized bed boiler to combust. The method extracts high-value components from the fed coal to supply outwards, utilizes residual components for combustion in the boiler, does not influence running of a pulverized coal fired boiler, and can make full use the high-value components in the coal, so as to make full use of energy.

Description

technical field [0001] The invention relates to the technical field of coal pyrolysis, and relates to a method for topping coal in front of a circulating fluidized bed boiler. Background technique [0002] my country is rich in coal resources and is a major producer and consumer of coal, but it is also a major oil importer in the world. Using the solid heat carrier produced by the circulating fluidized bed combustion chamber as the heat source of coal pyrolysis can convert the volatile matter in the coal into tar and gas, which is a very suitable method for improving the value of coal. [0003] The existing solid heat carrier coal pyrolysis methods are mainly divided into two categories, one is to increase the pyrolysis chamber in the circulation loop of the circulating fluidized bed boiler, and use the circulating ash in the furnace of the circulating fluidized bed boiler as the pyrolysis chamber The solid heat carrier, the pyrolysis chamber is just an accessory of the cir...

Claims

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Application Information

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IPC IPC(8): F23C10/22C10J3/20
CPCY02E20/18
Inventor 吕清刚高鸣宋国良王东宇那永洁
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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