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Method for preparing cement kiln synergistic desulfurization and denitrification agent through resource utilization of hazardous waste and solid waste

A desulfurization, denitrification and resource utilization technology is applied in the field of preparing cement kiln synergistic desulfurization and denitrification agent, which can solve the problems of system impact, high cost and difficult disposal, and achieve the effects of simple process operation, elimination of fugitive ammonia, and cost reduction.

Pending Publication Date: 2022-07-01
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The discarded SCR denitrification catalyst is defined as hazardous waste, while the electrolytic slag produced in the electrolytic manganese industry and the carbide slag produced in the chemical industry are solid waste, which are difficult and costly to dispose of;
[0007] (2) The existing desulfurization and denitrification technology has high investment and operating costs, and has a certain impact on the system;

Method used

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  • Method for preparing cement kiln synergistic desulfurization and denitrification agent through resource utilization of hazardous waste and solid waste
  • Method for preparing cement kiln synergistic desulfurization and denitrification agent through resource utilization of hazardous waste and solid waste

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Effect test

Embodiment 1

[0036] The background emission concentration of nitrogen oxides at the C1 outlet is 280mg / Nm 3 , SO 2 The background emission concentration is 230mg / Nm 3 , according to the mass ratio of 1:2:2, mix the waste SCR denitration catalyst (block size less than 80mm), electrolytic manganese slag and calcium carbide slag crushed by the hammer crusher; coarsely grind the mixed materials until the size is smaller than 2mm particles; in the coarsely ground material, 1% of fly ash and 0.1% of white mud by mass are respectively added, and finely ground to particles smaller than 80 μm in size to obtain desulfurization and denitrification agent.

[0037] like figure 1 As shown in the figure, the desulfurization and denitrification agent and the cement raw meal are mixed at a ratio of 1:1000, and then enter the kiln elevator through the chute, and then add it from the air duct connecting the C1 and C2 cyclones at the kiln end to achieve desulfurization and denitrification. After adding nitr...

Embodiment 2

[0039] The background emission concentration of nitrogen oxides at the C1 outlet is 260mg / Nm 3 , SO 2 The background emission concentration is 350mg / Nm 3 , according to the mass ratio of 2:2:5, mix the waste SCR denitration catalyst (block size less than 100mm), electrolytic manganese slag and calcium carbide slag crushed by the hammer crusher; coarsely grind the mixed materials to a size smaller than 2mm particles; in the coarsely ground material, respectively add fly ash and 0.2% cerium oxide, which account for 2% by mass, and finely grind to particles smaller than 80 μm to obtain desulfurization and denitrification agent.

[0040] The desulfurization and denitrification agent is mixed with the cement raw meal at a ratio of 2:500, and then enters the kiln hoist through the chute and is added from the air duct connecting the C1 and C2 cyclones at the kiln end to achieve desulfurization and denitrification. After adding, the nitrogen oxides in the exhaust gas are reduced. to...

Embodiment 3

[0042] The background emission concentration of nitrogen oxides at the C1 outlet is 400mg / Nm 3 , SO2 The background emission concentration is 500mg / Nm 3 , according to the mass ratio of 3:1:5, mix the waste SCR denitration catalyst (block size less than 60mm), electrolytic manganese slag and calcium carbide slag crushed by the hammer crusher; coarsely grind the mixed materials until the size is smaller than 2mm particles; in the coarsely ground material, add fly ash, 0.2% cerium oxide, 0.2% zirconia, which account for 2% of its mass ratio, and finely grind it to less than 80μm particles to obtain desulfurization and denitrification. agent.

[0043] like figure 2 As shown in the figure, the desulfurization and denitrification agent, which accounts for 5‰ of the cement raw meal mass, is sent to the decomposition furnace through the Roots fan through the metering pump to achieve desulfurization and denitrification. After adding, the nitrogen oxides in the exhaust gas are reduc...

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Abstract

The invention relates to a method for preparing a synergistic desulfurization and denitrification agent for a cement kiln by recycling hazardous waste and solid waste. The method comprises the following steps: (1) mixing a crushed waste SCR (Selective Catalytic Reduction) denitrification catalyst, electrolytic manganese residues and carbide slag according to a certain mass ratio; (2) carrying out coarse grinding on the mixed material; and (3) adding an auxiliary agent into the material subjected to coarse grinding according to a certain proportion, and performing fine grinding to obtain the desulfurization and denitrification agent. According to the invention, nitrogen oxide and sulfur dioxide in the cement kiln tail gas can be synergistically removed, the emission standard is met, escape ammonia generated by an SNCR system can be eliminated, and increasingly strict ammonia escape supervision requirements are met; dangerous waste and solid waste can be treated while the desulfurization and denitrification cost is reduced, and resource reutilization is performed to create an environment-friendly value. Dust and waste liquid are not additionally generated, the technological process is easy to operate, and equipment and land occupation are not newly added.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, in particular to a method for preparing a cement kiln synergistic desulfurization and denitrification agent by utilizing hazardous waste and solid waste as resources. Background technique [0002] The cement industry is one of the main sources of sulfur dioxide and nitrogen oxides, SO 2 And NOx can cause haze, acid rain and photochemical smog, etc., and have important harm to human health. In recent years, with strict standards to control the emission concentration and total amount, therefore, the cement industry desulfurization and denitrification has reached SO 2 And ultra-low NOx emissions are an inevitable need to create a better living environment. [0003] At present, the most widely used and mature desulfurization technology in the cement industry is limestone-gypsum desulfurization. Using this technology has high desulfurization efficiency, but the desulfurization syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/60C04B7/24C04B7/42C04B7/44
CPCB01D53/83B01D53/60C04B7/421C04B7/24C04B7/44Y02P40/10
Inventor 赵琳刘瑞芝赵艳妍马娇媚张利娜彭学平
Owner TIANJIN CEMENT IND DESIGN & RES INST
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