Desulphurization method for circulating fluidized bed boiler with superfine desulfurizing agent granules

A circulating fluidized bed and desulfurizing agent technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of small specific surface area, low desulfurization efficiency, large diameter of desulfurizing agent particles, etc., and achieve large specific surface area , reduce waste, easy to promote the effect of implementation

Inactive Publication Date: 2016-12-07
周建强
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the existing circulating fluidized bed boiler furnace desulfurization technology cannot be combined with SO due to the large diameter of desulfurizer particles and small specific surface area 2 Full reaction, low desulfurization efficiency

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  • Desulphurization method for circulating fluidized bed boiler with superfine desulfurizing agent granules

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Embodiment

[0012] Embodiment: The accompanying drawing is a schematic diagram of a circulating fluidized bed boiler ultrafine particle desulfurization agent desulfurization method implementation diagram, the circulating fluidized bed boiler includes a desulfurizer injection pipe (1), a lower secondary air pipe (2), and a furnace (3) , cyclone separator (4). The desulfurizer powder (particle diameter: 50-75 μm) is sprayed into the furnace (3) through the desulfurizer injection pipe (1) by means of gas delivery, and the calcium-sulfur ratio is kept at 1.8-2.5. A desulfurizer injection pipe (1) is installed in each lower secondary air pipe (2) of the boiler. Under the action of the secondary air, the desulfurizer quickly diffuses into the flue gas and combines with the SO2 in the flue gas. Reacts to form sulfates or sulfites. The unreacted desulfurizer is captured by the cyclone separator (4) and circulated with the material to the furnace (3) for secondary reaction. The furnace temperatu...

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Abstract

The invention discloses a desulphurization method in a circulating fluidized bed boiler, and belongs to the technical field of desulphurization of the fluidized bed boiler burning solid fuel such as coal, petroleum coke and biomass. The method is mainly used for solving the problem that the desulfurization efficiency in the circulating fluidized bed boiler is low. The desulphurization method is characterized by comprising the following steps of selecting limestone or magnesium oxide powder of which the diameter is 50-75[mu]m as a desulfurizing agent, conveying desulfurizing agent powder by using compressed air of which the flow rate is 45-55m / s, spraying the desulfurizing agent into a furnace chamber by using a secondary air nozzle of the circulating fluidized bed boiler, inserting a conveying pipeline into each secondary air duct of the boiler, and maintaining the desulfurizing agent conveying pipe and the secondary air nozzle concentric, wherein the calcium sulfur ratio is 1.8-2.5, and the temperature of the furnace chamber is 800-950 DEG C. According to the method, the desulfurization efficiency can reach 90% or above.

Description

Technical field: [0001] The invention discloses an in-furnace desulfurization method of a circulating fluidized bed boiler, which belongs to the technical field of desulfurization of solid fuel circulating fluidized bed boilers such as coal, petroleum coke and biomass. Background technique: [0002] Because of the simple process, high desulfurization efficiency and low operating cost, the calcium spraying desulfurization technology in the furnace is widely used in circulating fluidized bed boilers. However, the national standard "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) puts forward higher requirements for power generation boilers in thermal power plants, requiring existing boilers to discharge SO in flue gas 2 Concentration below 200mg / Nm 3 , new boilers and key areas require the emission of SO 2 Concentration below 100mg / Nm 3 . At present, many circulating fluidized bed boiler SO 2 The original concentration is greater than 1000mg / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D45/16
Inventor 周建强李玉娜秦光耀李文举梁东义杨建华屈卫东
Owner 周建强
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