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A kind of powder desulfurizer for cement kiln and its preparation method and application

A technology of desulfurization agent and cement kiln, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. Less pollution and improved reaction efficiency

Active Publication Date: 2021-03-19
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the production scale of the cement industry is huge. Under the influence of the huge production capacity, the quality of raw materials and fuels used continues to decline. It is inevitable to use raw materials such as limestone with high sulfur content, and the resulting SO 2 Emissions will also gradually increase, so it is necessary to increase SO 2 investment in processing equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Will CA (OH) 2 50%, alumina, 0.3% iron oxide, 35% urea, 10.5% sodium bicarbonate, mixed with rare earth element compound, rare element compound: 77%, manganese dioxide, 2%, dioxide 3%, the above components are a mass percentage. The sum of the mass percentage is 100% after mixing of each component.

[0038] The mixture was grinded into a powdery material through a deep process, and mixed under the mixing machine to obtain a desulfurizer dry powder. The mass percentage of the desulfurizing agent and the amount of cement blended amount is 0.05%.

[0039] The protocol case is on-site application in the Bai Nian Cement Factory of China Building Materials Group, in this bottom SO 2 Emission about 400mg / nm 3 Under the premise, the amount of desulfurization dose is 1T / h, and final SO 2 Emissions less than 20mg / nm 3 . Continuous use of more than a week, there is no adverse effect on the rear spatant, the bag lottery, and the SCR reactor, and the desulfurization efficiency is ...

Embodiment 2

[0041] Will CA (OH) 2 55%, alumina, 0.2% iron oxide, 30.5% urea, 9% sodium bicarbonate, mixed with rare earth elements, in rare elements compound: 78%, manganese dioxide 18%, dioxide 4%, the above components are a mass percentage. The sum of the mass percentage is 100% after mixing of each component.

[0042] The mixture was grinded into a powdery material through a deep process, and mixed under the mixing machine to obtain a desulfurizer dry powder. The mass percentage of the desulfurizing agent and the amount of the cement blend is 0.2%.

[0043] The proportion of the program case is used in the 2 # production line of the Southern Cement Company of China Building Materials Group, in this bottom SO 2 Up to 1300mg / nm emissions 3 Under the conditions, you can use a 0.5T / h desulfurizer to ensure final SO. 2 Emissions in 20 mg / nm 3 Within, the desulfurization agent is used in the amount of ammonia ratio of about 0.53, the base ratio of 1.15, and the desulfurization efficiency i...

Embodiment 3

[0045] Will CA (OH) 2 50%, alumina, 0.5% iron oxide, 29% urea, 15% sodium bicarbonate, mixed with 1.7% rare earth element compound, rare element compound: 79%, manganese dioxide 18%, dioxide 3%, the above components are a mass percentage. The sum of the mass percentage is 100% after mixing of each component.

[0046] The mixture was grinded into a powdery material through a deep process, and mixed under the mixing machine to obtain a desulfurizer dry powder. The amount of the desulfurizer added to the cement blended amount is 0.3%.

[0047] The proportion example is used in the Central Building Materials Group Southern Cement Company Guangde Cement Plant, in this bottom SO 2 Up to 600mg / nm emissions 3 Under the conditions, you can use a 0.4T / h desulfurizer to ensure final SO. 2 Emissions in 20 mg / nm 3 Within, the desulfurization efficiency is greater than 96%.

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Abstract

The invention relates to a powder desulfurizing agent for a cement kiln, and a preparation method and application of the powder desulfurizing agent. The powder desulfurizing agent is prepared from thefollowing raw materials in percentage by mass: 50 to 65% of calcium hydroxide, 3 to 4% of aluminum oxide, 0.01 to 0.5% of ferric oxide, 20 to 35% of urea, 5 to 15% of sodium bicarbonate and 1 to 2% of a rare earth element compound. The rare earth element compound comprises the following raw materials in percentage by mass: 77-80% of rare earth tailings, 17-20% of manganese dioxide and 3-5% of cerium dioxide, wherein the proportions of the rare earth tailings, the manganese dioxide and the cerium dioxide refer to the percentages of the rare earth tailings, the manganese dioxide and the ceriumdioxide to the total mass of the rare earth element compound. The preparation method comprises the following steps: mixing the above raw materials in proportion, carrying out deep processing, then grinding the raw materials into a powdery material, and carrying out sufficient mixing to obtain the powdery desulfurizing agent. The desulfurizing agent is added into a kiln together with a cement raw material so as to reduce the concentration of SO2 in cement kiln flue gas, wherein the adding amount of the desulfurizing agent is 0.03-0.3% of the mass of the cement raw material.

Description

Technical field [0001] The present invention belongs to the technical field of desulfurizer, and in particular, a powder desulfurizing agent for cement kiln and a preparation method thereof. Background technique [0002] The cement industry is the focus of the atmospheric pollution. In addition to shutting down the unqualified small businesses, focusing on the comprehensive enterprises that support dust and declined equipment, the utilization of new technologies is also the key to solving problems. At present, harmful gases such as sulfides have a large proportion of pollution in the cement industry, which is one of the fog of smog; in addition, it also causes serious harm to the human respiratory tract, skin, etc. Therefore, dust removal and desulfurization in cement industry is one of the focus of governance atmospheric pollution. Sulfur emissions in the cement industry have their own characteristics, there are two sulfur elements, which are raw materials-containing sulfur-cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/42B01D53/50
CPCB01D53/508C04B7/364C04B7/42C04B7/424C04B7/425C04B7/428
Inventor 胡芝娟赵亮陈昌华代中元
Owner TIANJIN CEMENT IND DESIGN & RES INST
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