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Method for using solid/liquid coal double fuel for circulation fluidized bed boiler

A circulating fluidized bed and boiler combustion technology, which is applied in the direction of fluidized bed combustion equipment, fuel for combustion in a molten state, combustion methods, etc., can solve problems such as increasing boiler operation and maintenance costs, affecting boiler life, and supplying steam

Inactive Publication Date: 2005-01-12
SHENYANG DAVID ENVIRONMENTAL PROTECTION & ENERGY SAVING EQUIP
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Problems solved by technology

Due to the high hardness of quartz sand itself, the furnace wall will be scoured and worn during the flow state, which will seriously affect the life of the boiler and increase the cost of boiler operation and maintenance.
In addition, if the amount of coal-water slurry is insufficient, the boiler cannot burn coal, and it will no longer be able to supply steam and hot water to production.
The technology of turning coal into coal water slurry and using waste liquid and sludge to produce coal water slurry has also been solved; but this method of using circulating fluidized bed boilers to burn solid and liquid coal dual fuels has not yet been

Method used

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  • Method for using solid/liquid coal double fuel for circulation fluidized bed boiler
  • Method for using solid/liquid coal double fuel for circulation fluidized bed boiler
  • Method for using solid/liquid coal double fuel for circulation fluidized bed boiler

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Embodiment Construction

[0031] A paper mill needs two 35-ton / hour steam boilers. The paper mill produces 45 tons of sludge and 50 tons of combustible garbage (mainly plastic) every day. The solid and liquid fuel supply device of this patent have been installed in 2 sets of 35 tons / hour circulating flow sleeper bed boilers of this paper mill. The paper mill installs a slurry tank and a slurry storage tank, and puts papermaking sludge, coal powder, papermaking waste liquid and additives into the pulping tank in proportion to make sludge with a calorific value of 17000-19000KJ / kg Coal water slurry, the sludge coal water slurry is transported to the slurry storage tank for storage.

[0032] The combustible garbage generated in the papermaking production is dried and screened by the drying equipment using the residual heat of the boiler flue gas, and then crushed and mixed with coal powder to make mixed coal powder with a particle size of 0-10mm. The pulverized coal and mixed pulverized coal are sent to ...

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Abstract

The present invention is the technological process of simultaneously burning solid and liquid fuel in circular fluidized bed boiler. In the boiler, are installed simultaneously granulator for feeding coal water slurry, spiral coal feeder for feeding coal powder, coal gangue powder or coal powder mixture with inflammable garbage, and auxiliary double-fuel feeder. The technological parameters includes coal water slurry pressure of 0.2-0.4 MPa, certain solid / liquid fuel ratio, fluidized bed expansion ratio of 1.5-2.1, operation gas speed of 3-7 m / s, circulation multiplying factor of 6-8, boiling pressure difference of 4500-6000 Pa, and burning temperature of 800-950 deg.c. The burning technological process includes three different cases including that with coal water slurry, that without coal water slurry and that with coal powder mixture; and coal powder adding amount is regulated based on the bed layer height and the furnace temperature mainly.

Description

technical field [0001] According to the International Patent Classification Table, this patent belongs to the technical field of fluidized bed combustion technology for simultaneously burning two fuels, and in particular relates to a method for burning solid and liquid coal dual fuels using a circulating fluidized bed boiler. Background technique [0002] Current circulating fluidized bed boilers all use only one fuel in coal, coal gangue or coal-water slurry. The singleness of fuel used affects boiler users, and coal-fired boilers cannot be used to burn combustible garbage, waste liquid and organic matter in sludge. However, the circulating fluidized bed boiler that uses waste liquid and sludge to make coal-water slurry has been realized, and there is a need to add quartz sand to the furnace as a fluidizing medium when the boiler is running. Due to the high hardness of the quartz sand itself, the furnace wall is scoured and worn during the flow state, which seriously affec...

Claims

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Application Information

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IPC IPC(8): F23C10/18F23C10/22F23C10/28
Inventor 张大伟
Owner SHENYANG DAVID ENVIRONMENTAL PROTECTION & ENERGY SAVING EQUIP
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