Solid waste-based in-furnace synchronous desulfurization and denitrification agent as well as preparation method and application thereof

A desulfurization, denitrification and internal synchronization technology, applied in separation methods, combustion methods, chemical instruments and methods, etc., can solve problems such as desulfurization, and achieve the effects of reducing NOx control pressure, reducing ammonia injection, and saving clean water resources

Active Publication Date: 2021-10-19
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the present invention provides a synchronous desulfurization and denitrification agent in a solid waste-based furnace and its preparation method and application. Using the special properties of calcium carbide slag, biomass and sludge, they are mixed and formed to make a It is used for simultaneous desulfurization and denitrification products in the furnace to solve the problems of existing furnace desulfurization, low-load operation denitrification, solid waste utilization, etc.

Method used

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  • Solid waste-based in-furnace synchronous desulfurization and denitrification agent as well as preparation method and application thereof
  • Solid waste-based in-furnace synchronous desulfurization and denitrification agent as well as preparation method and application thereof
  • Solid waste-based in-furnace synchronous desulfurization and denitrification agent as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] refer to figure 1 , the preparation method and application of synchronous desulfurization and denitrification agent in the solid waste base furnace, comprising the following steps:

[0038] Step 1: Carbide slag and sludge with a water content of 5% after mechanical dehydration are mixed according to a mass ratio of 7:3 and then mechanically dehydrated to make a mixture of calcium carbide slag and sludge in a semi-dry state with a water content of 40%, and Crushing the biomass into biomass powder with a particle size of 2 mm;

[0039] Step 2, mix the biomass powder and the mixture in step 1 again according to the mass ratio of 2:8, and add quick-drying high-alumina cement binder accounting for 5% of the total mass of the mixture and 0.5% of the total mass of the mixture for fermentation agent, stir it evenly in a stirring tank to obtain a mixture;

[0040] In step 3, the mixture evenly stirred in step 2 is fermented. The fermentation condition is to use the flue gas at...

Embodiment 2

[0046] Preparation of simultaneous desulfurization and denitrification agent in solid waste base furnace

[0047] Take 10g of sludge in a semi-dry state and 90g of calcium carbide slag in a semi-dry state for mixing, add 5g of quick-drying high-alumina cement and 0.5g of starter, and mix the mixture evenly in the mixing tank; Part of the flue gas waste heat at 100°C to 150°C in front of the flue dust collector of the fluidized bed boiler heats the evenly stirred mixture to 30°C for 2 days of stuffing fermentation, and uses part of the waste heat of the flue gas to heat the mixture after fermentation Dry, and control the moisture after drying at 25% to 35%. Then put the mixture into a screw extruder to extrude columns with a diameter of 1.5 mm to 5 mm, cut the column mixture according to the width of 5 mm to 10 mm, and put the segments into a spheronizer to form spherical particles. The spheroidized particles are naturally air-dried, and the water content is controlled at 5% a...

Embodiment 3

[0049] The use of synchronous desulfurization and denitrification agent in the solid waste base furnace of the present invention

[0050] When the synchronous desulfurization and denitrification agent is used in the furnace, the boiler needs to be modified, and the position of the upper secondary air should be raised to further strengthen the oxygen-poor atmosphere in the furnace. The reduction ability of NOx is also enhanced. Then the synchronous desulfurization and denitrification agent enters from the lower secondary tuyere, where the oxygen concentration is 1% to 3%. Rich pore structure. and here SO 2 Generated, good for shortening SO 2 Response time to concentration reduction. Abundant pore structure enhances SO adsorption on coke surface 2 and NOx, promote coke reduction of NOx and calcium carbide slag and SO 2 gas-solid reaction, effectively reducing SO in the furnace 2 and NOx concentrations.

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Abstract

The invention relates to the field of in-furnace synchronous desulfurization and denitrification during low-load operation of a circulating fluidized bed boiler, in particular to a solid waste-based in-furnace synchronous desulfurization and denitrification agent as well as a preparation method and application thereof. Biomass, sludge in a semi-dry state and carbide slag are mixed, then, under the action of a binder and a leavening agent, a formed mixture is extruded, cut, rounded and air-dried to obtain an in-furnace synchronous desulfurization and denitrification agent, mixed pellets with certain strength and suitable in-furnace particle size are formed, moisture difficult to remove in the carbide slag and the sludge is fully utilized for mixing and forming, and the problem that carbide slag is too small in particle size and easy to escape is solved. Rich pore structures are formed in the particles, two reaction paths of chemical and adsorption are provided, and a good NO removal effect is still achieved at the low temperature of 500-800 DEG C. According to the system and the method, the NO emission reduction pressure during normalized low-load operation peak regulation of the circulating fluidized bed boiler is relieved while various solid waste pollution and resource waste are solved.

Description

technical field [0001] The invention relates to the field of synchronous desulfurization and denitrification in a circulating fluidized bed boiler during low-load operation, in particular to a synchronous desulfurization and denitrification agent in a solid waste-based furnace, a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of clean energy technologies such as wind power, hydropower, and solar power and the country's strong support for new clean energy, the proportion of new energy in the power grid has gradually increased, and the demand for thermal power generation peak regulation has also gradually increased. When the circulating fluidized bed boiler is in deep peak-shaving and low-load operation, because the flue gas temperature in the furnace is reduced to 600-800°C, the SNCR deviates from the optimal reaction temperature range of 850-1150°C, the denitrification efficiency decreases, and the ammonia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/81B01D53/60F23C10/14
CPCB01D53/81B01D53/60F23C10/14B01D2258/0283
Inventor 程芳琴孟江涛王菁张瑞娉杨凤玲
Owner SHANXI UNIV
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