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Powder desulfurizing agent for cement kiln and preparation method and application thereof

A technology of desulfurization agent and cement kiln, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of reduced raw fuel quality and increased investment in processing equipment, so as to reduce pollution and increase the desulfurization reaction rate. and efficiency, the effect of reducing the emission of SO2

Active Publication Date: 2020-01-14
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] Ca(OH) 2 50%, alumina 3.2%, iron oxide 0.3%, urea 35%, sodium bicarbonate 10.5%, rare earth element compound 1.0%, among the rare element compound: rare earth tailings 77%, manganese dioxide 20%, dioxide 3% of cerium, the above-mentioned components are mass percentages. The sum of the mass percentages of each component after mixing is 100%.

[0038] The mixture is further processed and ground into a powder material, and fully mixed under the mixer to obtain a dry desulfurizer powder. The mass percentage of the added amount of desulfurizer and the blended amount of cement raw meal is 0.05%.

[0039] The formula case was applied on-site at the Baixian Cement Plant of China National Building Materials Group Southern Cement Company. 2 Emission about 400mg / Nm 3 Under the premise of using a desulfurization dose of 1t / h, the final SO 2 Emission less than 20mg / Nm 3 . Continuous use for more than a week has no adverse effects on the rear raw mill, bag filter, and SCR reac...

Embodiment 2

[0041] Ca(OH) 2 55%, aluminum oxide 4%, iron oxide 0.2%, urea 30.5%, sodium bicarbonate 9%, rare earth element compounds 1.3%, among the rare element compounds: rare earth tailings 78%, manganese dioxide 18%, dioxide Ce 4%, the above components are mass percentages. The sum of the mass percentages of each component after mixing is 100%.

[0042] The mixture is further processed and ground into a powder material, and fully mixed under the mixer to obtain a dry desulfurizer powder. The mass percentage of the amount of desulfurization agent added and the blending amount of cement raw meal is 0.2%.

[0043] This formula case is used in the 2# production line of Huaikan Cement Plant of Southern Cement Company of China National Building Materials Group. 2 Emission up to 1300mg / Nm 3 Under the condition of 2 Emission at 20mg / Nm 3 Within the range, the ammonia-sulfur ratio of desulfurizer usage is about 0.53, the alkali-sulfur ratio is about 1.15, and the desulfurization efficien...

Embodiment 3

[0045] Ca(OH) 2 50%, alumina 3.8%, iron oxide 0.5%, urea 29%, sodium bicarbonate 15%, rare earth element compound 1.7%, among the rare element compounds: rare earth tailings 79%, manganese dioxide 18%, dioxide 3% of cerium, the above-mentioned components are mass percentages. The sum of the mass percentages of each component after mixing is 100%.

[0046] The mixture is further processed and ground into a powder material, and fully mixed under the mixer to obtain a dry desulfurizer powder. The mass percentage of the amount of desulfurization agent added and the blending amount of cement raw meal is 0.3%.

[0047] This formula case was used in the Guangde Cement Plant of China National Building Materials Group Southern Cement Company. 2 Emission up to 600mg / Nm 3 Under the condition of 0.4t / h desulfurizer at most, the final 2 Emission at 20mg / 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 invention belongs to the technical field of desulfurizers, and in particular relates to a powder desulfurizer for cement kilns and its preparation method and application. Background technique [0002] The cement industry is a key industry of air pollution. Currently, in addition to shutting down unqualified small enterprises, we will focus on supporting large enterprises with complete dust removal and sulfur reduction equipment. The use of new technologies is also the key to solving the problem. At present, harmful gases such as sulfur oxides account for a large proportion of pollution in the cement industry, and are one of the culprits causing smog; in addition, they also cause serious harm to the human respiratory tract and skin. Therefore, dust removal and desulfurization in the cement industry is one of the key points in the control of air pollution. Sulfur emission in the cement industry has its own characteristics. There are two sources of s...

Claims

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Application Information

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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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