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Combined desulfurization and denitration method for novel dry-process cement production line

A technology of desulfurization and denitrification and dry process cement, which is applied in the field of combined desulfurization and denitrification, can solve the problems of low denitrification efficiency and achieve the effects of reducing costs, low costs and increasing production capacity

Inactive Publication Date: 2020-04-10
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of SNCR denitrification technology is that the denitrification efficiency is low
At present, for the new dry process cement production line, there are few desulfurization and denitrification technologies with good effect, low cost and no secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 20kg of ferric nitrate and 20kg of copper nitrate in 200kg of water, add 100kg of commercially available kaolinite, soak for 2 hours, and filter to obtain filter residue. The filter residue was dried at 100°C for 5 hours and calcined at 500°C for 5 hours to obtain a denitration catalyst supported by clay. Add 50kg of iron oxide, 50kg of copper oxide, and 100kg of clay-based denitrification catalyst into 5000kg of calcium hydroxide to obtain a raw meal modifier. 12% ammonia solution is used as liquid desulfurization and denitrification agent. For a new dry-process cement production line with a daily output of 2,500 tons of clinker, the background sulfur dioxide emission concentration is 400 mg / m 3 , the nitrogen oxide emission concentration is 400mg / m 3 . Add the raw meal modifier through the elevator of the raw meal storage, the addition amount is 5000kg / h, and the liquid desulfurization and denitrification agent is added through the spray gun to the upper a...

Embodiment 2

[0022] Dissolve 20kg of ferric nitrate and 20kg of cerium nitrate in 200kg of water, add 100kg of commercially available kaolinite, soak for 2 hours, and filter to obtain a filter residue. The filter residue was dried at 100°C for 5 hours and calcined at 500°C for 5 hours to obtain a denitration catalyst supported by clay. Add 80kg of iron oxide, 80kg of copper oxide, and 100kg of clay-based denitration catalyst to 5000kg of calcium hydroxide to obtain a raw meal modifier. 12% ammonia solution is used as liquid desulfurization and denitrification agent. For a new dry-process cement production line with a daily output of 2,500 tons of clinker, the background sulfur dioxide emission concentration is 400 mg / m 3 , the nitrogen oxide emission concentration is 400mg / m 3 . Add the raw meal modifier through the elevator of the raw meal storage, the addition amount is 5000kg / h, and the liquid desulfurization and denitrification agent is added through the spray gun to the upper air p...

Embodiment 3

[0024] Dissolve 15kg of ferric nitrate and 15kg of cerium nitrate in 200kg of water, add 100kg of commercially available kaolinite, soak for 2 hours, and filter to obtain a filter residue. The filter residue was dried at 100°C for 5 hours and calcined at 500°C for 5 hours to obtain a denitration catalyst supported by clay. Add 100kg of iron oxide, 100kg of copper oxide, and 100kg of clay-based denitrification catalyst to 5000kg of calcium hydroxide to obtain a raw meal modifier. 12% ammonia solution is used as liquid desulfurization and denitrification agent. For a new dry-process cement production line with a daily output of 2,500 tons of clinker, the background sulfur dioxide emission concentration is 400 mg / m 3 , the nitrogen oxide emission concentration is 400mg / m 3 . Add the raw meal modifier through the elevator of the raw meal storage, the addition amount is 5000kg / h, and the liquid desulfurization and denitrification agent is added through the spray gun to the upper...

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Abstract

A combined desulfurization and denitration method for a novel dry-process cement production line is disclosed. The method includes adding a raw material modifier and a liquid desulfurization and denitration agent which are two parts into the cement production line. The raw material modifier is added at a raw material elevator, and the liquid desulfurization and denitration agent is added at a windpipe among cyclone preheaters C1-C3. The raw material modifier includes 10-98% of a SO2 absorbent, 0.01-30% of an active component promoting SO2 absorption, 0.01-30% of an active component promotinglimestone decomposition, and 0.01-30% of a denitration catalyst adopting clay as a carrier. The liquid desulfurization and denitration agent includes 0.1-25% of ammonia water, 0.1-40% of a urea solution, or a solution mixture of both. The method has technical advantages of good desulfurization and denitration effects, low cost and no secondary pollution.

Description

Technical field: [0001] The invention relates to a combined desulfurization and denitrification method for a new dry process cement production line. Background technique: [0002] As my country pays more and more attention to environmental issues, corporate pollutant emissions will be strictly limited. Sulfur dioxide and nitrogen oxides are important indicators for my country's cement industry to control emissions. Sulfur dioxide has a pungent smell and can cause acid rain; nitrogen oxides can cause photochemical smog, acid rain, and ozone depletion. The two have caused serious harm to the ecological environment and have aroused great concern from the country. [0003] Commonly used desulfurization technologies include dry desulfurization, semi-dry desulfurization, and wet desulfurization. The disadvantage of dry desulfurization is low desulfurization efficiency; the disadvantage of wet desulfurization is the huge investment in equipment; semi-dry desulfurization solves t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/42B01D53/75B01D53/60B01D53/86
CPCB01D53/60B01D53/75B01D53/8628B01D2258/0233C04B7/424C04B7/425C04B7/428Y02A50/20
Inventor 苏少龙曲晓龙钟读乐孙彦民南军李世鹏
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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