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A method of using papermaking sludge for desulfurization, denitrification and coal saving in circulating fluidized bed boilers

A technology of circulating fluidized bed and papermaking sludge, which is applied in the direction of combustion method, block/powder fuel preparation, combustion equipment, etc., can solve the problems of high desulfurization cost, reduced desulfurization efficiency, high operating cost, etc., to avoid secondary Secondary pollution, high degree of harmlessness, and the effect of reducing treatment costs

Inactive Publication Date: 2011-12-07
桑洪忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The investment cost of installing desulfurization equipment is large
[0004] (2) Desulfurization equipment and system operating costs are high
[0005] (3) Desulfurization equipment and system engineering have poor long-term operation performance and low availability
[0006] (4) The desulfurization efficiency is low, and the desulfurization standard cannot be operated normally at all.
The actual operating parameters of the boiler system deviate too much from the design values, the desulfurization efficiency decreases, and the designed desulfurization efficiency and sulfur dioxide emission standards cannot be met at all.
[0007] (5) The desulfurization device cannot meet the normal operation and application requirements
At present, my country's soot-type sulfur dioxide pollution is serious, the cost of desulfurization is high, and the operating cost is high

Method used

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  • A method of using papermaking sludge for desulfurization, denitrification and coal saving in circulating fluidized bed boilers
  • A method of using papermaking sludge for desulfurization, denitrification and coal saving in circulating fluidized bed boilers

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Embodiment 1

[0038] Papermaking sludge with a water content of more than 70% (air-drying base composition: CaO 40%, MgO 11%, Fe 2 o 3 0.4%, Al 2 o 3 2.2%, Na 2 O 0.3%), directly carry out air pressurized dehydration treatment, the sludge water content is reduced to below 60%, and the dehydration pressure is 1.3Mpa, and then the secondary dehydration is carried out by mechanical pressurization, and its water content is reduced to below 50%. Use a forming machine to make strips with a diameter of 8mm, and then cut them into 10mm strips with a reamer, and send them to the coal-feeding negative pressure zone of the boiler, where they will be burned together with the coal in the boiler furnace.

[0039] Generally, the sulfur content of coal is 2%-3%. One ton of coal desulfurization and denitrification needs to mix 200 kg of sludge with a water content of about 50%, because the calorific value of sludge is only 800-1000 kcal / kg, the circulating fluidized bed boiler requires the calorific va...

Embodiment 2

[0042] The papermaking sludge (the composition after drying is: CaO 42%, MgO 10%, Fe 2 o 3 0.6%, Al 2 o 3 2.3%, Na 2 O 0.2%), directly carry out air pressurized dehydration treatment, the water content of the sludge is reduced from more than 70% to less than 60%, and the dehydration pressure is 1.3Mpa. 50% or less, use a molding machine to make strips with a diameter of 8mm, and then cut them into 10mm strips with a reamer, and send them to the coal negative pressure zone of the boiler, where they will be burned together with coal in the boiler furnace.

[0043] Generally, the sulfur content of coal is 2%-3%. One ton of coal desulfurization and denitrification needs to mix 200 kg of sludge with a water content of about 50%, because the calorific value of sludge is only 800-1000 kcal / kg, the circulating fluidized bed boiler requires the calorific value of coal and sludge blended to be controlled at 2500-3000 kcal / kg. If the papermaking sludge is mixed too much, it will af...

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Abstract

The invention relates to a method for utilizing papermaking sludge to realize desulfuration, denitrification and coal conservation of a circulating fluid bed, and the method provided by the invention comprises the following steps: carrying out secondary dehydration on the papermaking sludge by virtue of an air and mechanical mode, manufacturing a strip form by virtue of a moulding machine, cutting into sections, and feeding the sections into the negative pressure area of a boiler, and burning the sections and coal in the hearth of the boiler; adding 110 kilos-140 kilos of sludge with the moisture content of 50% in one ton of coal; transferring generated waste water containing alkali liquor into a deinking workshop to a desulfuration circulating groove, and adding a devulcanizing agent (quicklime) and caustic soda flakes and mixing; feeding the mixture into a desulfurizing tower and performing neutralization reaction on the mixture and the acidic oxide in smoke; and adding 8 kilos-11 kilos of devulcanizing agent (quicklime) and 1 kilo-3 kilos of caustic soda flakes into a ton of coal; and carrying out the cyclic utilization, neutralization reaction, desulfuration and denitrification on the waste water containing alkali liquor, and then transferring the waste water with low PH value to a paper mill for recycling. In the method provided by the invention, the papermaking sludge and sewage are utilized as devulcanizing agents, thereby achieving the purpose of removing sulfide and nitride; and meanwhile, the papermaking sludge is taken as a fuel, thereby realizing energy conservation, emission reduction and waste recycle.

Description

technical field [0001] The invention relates to a method and technology for environmental protection, energy saving and waste utilization, in particular to a method for using papermaking sludge sewage in a circulating fluidized bed boiler for desulfurization, denitrification and coal saving. Background technique [0002] my country's total sulfur dioxide emission ranks first in the world, exceeding 80% of the capacity of the atmospheric environment. Many of the flue gas desulfurization of large-scale thermal power generating units in China have adopted foreign core process package technologies, which greatly restricts China. Further, high-level development of the desulfurization industry. Develop core technologies with independent intellectual property rights, and propose SO 2 , NO 2 The overall solution for emission reduction and the gradual realization of domestic industrialization goals are development plans that have always been advocated and supported by the State Envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K1/00
Inventor 桑洪忠谢运深
Owner 桑洪忠
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