Method for denitration of coal-fired power plant boiler through synergistic recycling of sludge and coal slime

A coal-fired power plant, resource utilization technology, applied in the direction of combustion methods, chemical instruments and methods, incinerators, etc., can solve the problems of large capacity and large dosage, high sulfur content, high ash content, low fixed carbon content, etc., and achieve improvement The effect of denitrification efficiency, reduction of NOx emissions, and acceleration of fuel combustion

Pending Publication Date: 2021-02-19
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three measures have been adopted and promoted in China, among which combustion utilization is the most important way of utilization, but most of the coal slime has low fixed carbon content, high sulfur and ash content, and low calorifi

Method used

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  • Method for denitration of coal-fired power plant boiler through synergistic recycling of sludge and coal slime
  • Method for denitration of coal-fired power plant boiler through synergistic recycling of sludge and coal slime
  • Method for denitration of coal-fired power plant boiler through synergistic recycling of sludge and coal slime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] refer to figure 1 A method for synergistic resource utilization of sludge and coal slime for denitrification of tangential pulverized coal boilers in coal-fired power plants, including the following steps:

[0044] Step 1, mechanically dehydrating municipal domestic sludge or coal slime or a mixture of sludge and coal slime to make semi-dry municipal domestic sludge or coal slime or a mixture of sludge and coal slime;

[0045] Step 2, put the semi-dried urban domestic sludge or coal slime or the mixture of sludge and coal slime after mechanical dehydration in a small fluidized bed boiler with a cyclone separator, and use the flue gas with a flue gas temperature of 500°C from a coal-fired power plant boiler to provide Heat source for simultaneous dehydration and pyrolysis. The cyclone separator recycles and pyrolyzes sludge / coal slime or a mixture of the two coke / semi-coke, and the large solid particles collide with each other in the air flow in the furnace to play a ro...

Embodiment 2

[0050] refer to figure 2 A method for synergistic resource utilization of sludge and coal slime for denitrification of tangential pulverized coal boilers in coal-fired power plants can carry out nitriding modification on the coke surface, including the following steps:

[0051] Step 1, mechanically dehydrating municipal domestic sewage sludge or coal slime or a mixture of sludge and coal slime to produce semi-dry municipal domestic sludge or coal slime or a mixture of sludge and coal slime;

[0052] Step 2, put the semi-dry urban domestic sludge or coal slime or the mixture of sludge and coal slime after mechanical dehydration in a small fluidized bed boiler with a cyclone separator, and use the flue gas of a coal-fired power plant boiler with a flue gas temperature of 600°C to provide Heat source for simultaneous dehydration and pyrolysis. The cyclone separator recycles sludge or coal slime or sludge coal slime mixture coke / semi-coke, and the large solid particles collide w...

Embodiment 3

[0057] refer to image 3 The method of synergistic resource utilization of sludge and coal slime for denitrification of tangential pulverized coal boilers in coal-fired power plants can be further combined with SNCR reactions, including the following steps:

[0058] Step 1, mechanically dehydrating municipal domestic sludge or coal slime or a mixture of sludge and coal slime to make semi-dry municipal domestic sludge or coal slime or a mixture of sludge and coal slime;

[0059] Step 2. Put the semi-dried urban domestic sludge or coal slime or the mixture of sludge and coal slime after mechanical dehydration in a small fluidized bed boiler with a cyclone separator, and use the flue gas with a flue gas temperature of 800°C from a coal-fired power plant boiler to provide Heat source for simultaneous dehydration and pyrolysis. The cyclone separator recycles sludge or coal slime or sludge coal slime mixture coke / semi-coke, and the large solid particles collide with each other in t...

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Abstract

The invention belongs to the field of municipal solid waste treatment and the technical field of coal-fired boiler flue gas denitration, and particularly relates to a method for denitration of a coal-fired power plant boiler through synergistic recycling of sludge and coal slime. The sludge or the coal slime or a sludge and coal slime mixture is subjected to preliminary dehydration through a mechanical device, the semi-dry sludge or coal slime or sludge and coal slime mixture is subjected to pyrolysis gasification by using flue gas waste heat of a power plant, gasified gas, liquid and solid products are added into the coal-fired boiler of the power plant from reasonable positions, pyrolysis gas and coke are used for strengthening denitration independently or in cooperation with SNCR reaction, liquid tar and the coke are effectively used for supporting combustion, resource clean utilization and harmless treatment of the coal slime and the sludge are achieved while the denitration efficiency of the boiler is improved, heat energy is fully coupled and utilized, and economic benefits and social benefits are remarkable.

Description

technical field [0001] The invention belongs to the field of municipal solid waste treatment and the technical field of flue gas denitrification of coal-fired boilers, and specifically relates to a method for synergistic resource utilization of sludge and coal slime for denitrification of coal-fired power plant boilers. Background technique [0002] (1) Municipal sludge treatment methods [0003] Municipal municipal sludge comes from urban sewage treatment plants, with an original moisture content of 95%-99%. With the improvement of residents' living standards, sludge production is increasing year by year. In addition to a large amount of nutrients such as nitrogen and phosphorus, sludge also contains toxic and harmful substances such as heavy metals, pathogens, parasite eggs, and toxic organic substances. If the sludge is not treated effectively, it will seriously pollute the environment and affect people's health. healthy. At present, sludge reduction and harmless treat...

Claims

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Application Information

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IPC IPC(8): F23G5/027F23G5/033F23G7/00C02F11/122C02F11/13C10B53/00C10K1/00C10K1/04B01D53/86B01D53/56
CPCF23G5/027F23G5/033F23G7/001C02F11/122C02F11/13C10B53/00C10K1/04C10K1/002B01D53/8625Y02P20/129Y02E20/12
Inventor 王菁张瑞娉孟江涛杨凤玲程芳琴
Owner SHANXI UNIV
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