In-furnace desulfurization method of circulating fluidized bed boiler

A circulating fluidized bed and furnace desulfurization technology, which is applied to chemical instruments and methods, separation methods, and dispersed particle separation, can solve problems such as secondary pollution, large area occupied by desulfurization, and water resource consumption. Effect of reducing liquid bridge force and increasing fluidity

Inactive Publication Date: 2019-05-10
YANKUANG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And solve the traditional wet and semi-dry desulfurization problems such as large footprint, secondary pollution, water consumption and high operating costs

Method used

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  • In-furnace desulfurization method of circulating fluidized bed boiler
  • In-furnace desulfurization method of circulating fluidized bed boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a furnace desulfurization method for a circulating fluidized bed boiler, such as figure 1 As shown, the system used in the method includes a circulating fluidized bed coal-fired boiler 1, a cyclone separator 2 and a feeder 3, and the desulfurizer limestone with an average particle size of 200 μm to 300 μm is passed into the circulating fluidized bed together with the coal. The reaction is carried out in the furnace body of the boiler 1, and the Ca / S in the furnace body of the circulating fluidized bed boiler 1 is ≤ 2.5; when the SO in the circulating fluidized bed boiler 1 2 Instantaneous emission concentration > 35mg / Nm 3 At the same time, the ultrafine composite additive is sent from the secondary tuyere 4 of the circulating fluidized bed boiler 1 into the circulating fluidized bed boiler 1 through the ultrafine composite additive dispersion and injection system to perform desulfurization in the furnace.

[0053] like figure 1 As shown, the ...

Embodiment 2

[0061] This embodiment provides an in-furnace desulfurization method for a circulating fluidized bed boiler. The method refers to the method in Embodiment 1, except that the average particle size of the desulfurizing agent limestone is 100 μm-200 μm.

[0062] Using the method described in this example, the desulfurization efficiency of the circulating fluidized bed boiler can reach 97%, and the SO in the final discharged flue gas 2 The concentration of 3 .

Embodiment 3

[0064] This embodiment provides an in-furnace desulfurization method for a circulating fluidized bed boiler. The method refers to the method in Embodiment 1, except that the average particle size of the desulfurizing agent limestone is 400 μm-500 μm.

[0065] Using the method described in this example, the desulfurization efficiency of the circulating fluidized bed boiler can reach 96%, and the SO in the finally discharged flue gas 2 The concentration of 3 .

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Abstract

The invention provides an in-furnace desulfurization method of a circulating fluidized bed boiler, which comprises the steps of introducing a desulfurizing agent and fire coal into a furnace body of the circulating fluidized bed boiler, allowing to react, feeding a superfine composite additive into the circulating fluidized bed boiler from a secondary air hole of the circulating fluidized bed boiler, and carrying out in-furnace desulfurization. The method of the invention combines the in-furnace desulfurizing agent and a superfine composite additive spraying technique, so that super-low emission of SO2 can be stably achieved. The problems are solved that, for instance, traditional wet and semi-dry desulfurization processes have large coverage, secondary pollution is caused, water resourceconsumption is high, and operation cost is high.

Description

technical field [0001] The invention belongs to the field of circulating fluidized bed boilers, and relates to an in-furnace desulfurization method of circulating fluidized bed boilers. Background technique [0002] According to the latest "Emission Standards of Air Pollutants for Thermal Power Plants" and local standards, the SO of industrial boilers 2 Emission concentration must be less than 200mg / Nm 3 , SO in some key areas 2 The emission concentration limit is 35mg / Nm 3 As a result, the pressure on environmental protection from local governments and production enterprises has increased. [0003] At present, the desulfurization methods of industrial boilers mainly include wet tail gas desulfurization outside the furnace, semi-dry desulfurization and calcium injection desulfurization technology inside the furnace. Among them, compared with the former two, the calcium spraying desulfurization technology in the furnace has the advantages of less land occupation, low init...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/83
Inventor 杨晓辉王振平谭波司硕宋德政卢晓明宋令坡王海苗
Owner YANKUANG GRP CO LTD
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