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Method for slime fluidized bed boiler desulphurization of sludge and white slime of papermaking factory

A technology for fluidized bed boilers and paper mills, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., to achieve cost savings, save the link of sulfur removal, and save costs

Inactive Publication Date: 2012-11-21
GUANGXI JINGUI PULP PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention also discloses a device for realizing the method; but because the invention must be used in conjunction with a specific device, the invention cannot be widely used in existing paper mills

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]For a 65-ton coal slime fluidized bed boiler, the coal slime conveyor transports about 18 tons of coal slurry per hour, and the sulfur content is 0.5% after testing; the temperature of the coal slime fluidized bed boiler is 850 degrees. The water content of the white mud produced by the paper mill is 55%, and the calcium carbonate content in the solid white mud is detected to be 95%. The sludge produced by the paper mill has a water content of 70%, and the sludge in the solid state contains 50% calcium oxide.

[0040] The sludge is transported to the dehydration workshop by means of transportation, and the sewage is pressurized by the air, and the pressure is 1.4MPa to remove the water content to 65%, and then use mechanical pressure to remove the water content of the sludge to 55%. Transport the white mud to the dog chemical workshop, wash with water, remove impurities with a diameter greater than 8cm in the white mud, and dehydrate the white mud with a pre-hanging filt...

Embodiment 2

[0042] For a 210-ton coal slime fluidized bed boiler, the coal slime conveyor transports about 60 tons of coal slurry per hour, and the sulfur content is 1% after testing; the temperature of the coal slime fluidized bed boiler is 880 degrees. The white mud produced by the paper mill has a water content of 50%, and the calcium carbonate content in the solid white mud is detected to be 90%. The sludge produced by the paper mill has a water content of 75%, and the sludge in the solid state contains 55% of calcium oxide.

[0043] The sludge is transported to the dehydration workshop by means of transportation, and the sewage is pressurized by air at a pressure of 1.5MPa to remove the water content to 60%, and then use mechanical pressure to remove the water content of the sludge to 50%. Transport the white mud to the dog chemical workshop, wash with water, remove impurities with a diameter greater than 8cm in the white mud, and dehydrate the white mud with a pre-hanging filter, so...

Embodiment 3

[0045] For a 140-ton coal slime fluidized bed boiler, the coal slime conveyor transports about 40 tons of coal slurry per hour, and the sulfur content is 0.8% after testing; the temperature of the coal slime fluidized bed boiler is 900 degrees. The water content of the white mud produced by the paper mill is 52%, and the calcium carbonate content in the solid white mud is detected to be 96%. The sludge produced by the paper mill has a water content of 73%, and the sludge in the solid state contains 52% of calcium oxide.

[0046] The sludge is transported to the dehydration workshop by means of transportation, and the sewage is pressurized by the air, and the pressure is 1.6MPa to remove the water content to 58%, and then use mechanical pressure to remove the water content of the sludge to 52%. Transport the white mud to the dog chemical workshop, wash with water, remove impurities with a diameter greater than 8cm in the white mud, and dehydrate the white mud with a pre-hanging...

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Abstract

The invention discloses a method for slime fluidized bed boiler desulphurization of sludge and white slime of a papermaking factory. The method comprises the following steps: mixing the papermaking sludge with the papermaking white slime, wherein the content of water in the sludge and white slime mixture is controlled at 45-55%, and the mass ratio of the sludge to the white slime is controlled at about 1:2-3; adding water to the slime, stirring, and mixing, wherein the content of water in the slime slurry is 25-33%; and mixing the white slime and the slime mixed with the sludge through using a slime conveying machine according to a molar ratio of the calcium content in the white slime to the sulfur content in the slime of 1.4-2.4:1. The method enables the fluidized bed boiler desulphurization to be carried out through mixing the papermaking sludge with the papermaking white slime to realize a purpose that a waste is controlled by another waste.

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource utilization, in particular to a method for desulfurizing a coal slime fluidized bed boiler with paper mill sludge and white mud. Background technique [0002] In our country, various exhaust gases emitted from combustion of paper mills have a great impact on the environment, and with the increase of electricity consumption, the amount of exhaust gases will increase. In particular, the combustion of paper mills releases a large amount of sulfur dioxide, which will cause air pollution. Therefore, desulfurization treatment must be carried out for coal combustion. [0003] With the development of science and technology, fluidized bed boilers are widely used in clean combustion technology. By adding limestone powder and coal to the fluidized bed furnace for mixed combustion to remove sulfur dioxide, and by controlling the temperature in the furnace and staged combustion, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/00C10L5/46
CPCY02E50/30Y02E50/10
Inventor 黄再桂
Owner GUANGXI JINGUI PULP PAPER
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