A production process of high activity desulfurization agent slaked lime

A production process and technology of slaked lime, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of high operating costs and potential safety hazards, and achieve excellent flow performance, reduced digestion water consumption, and high specific surface area Effect

Active Publication Date: 2022-04-08
NANJING WEIHENG EXPERIMENTAL EQUIP CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] In the U.S. patent publication with the publication number "US 005492685A", it is disclosed that a method of preparing a high surface area, small particle size slaked lime product by digesting quicklime and a large amount of alcohol, but the process needs to condense the alcohol, etc. Recycling, high operating costs, and there are certain safety hazards

Method used

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  • A production process of high activity desulfurization agent slaked lime

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 Shown, a kind of highly active desulfurizer slaked lime production process, comprises:

[0027] S1. Crushing: Put the quicklime block into the pulverizer through the silo for crushing to obtain the raw material of quicklime particles with a particle size of 2mm. processing in one step.

[0028] S2. Pre-digestion: put the quicklime particle raw material and digested water obtained in S1 into a vertical digester and mix them thoroughly for digestion to obtain lime slurry. In this step, the digestion temperature is 50° C., the digestion time is 10 min, and the digestion water includes by mass parts: 0.1% calcium ion complexing agent, 0.5% dispersant, and the rest is water. The rotating speed of the vertical digester is 60r / min.

[0029] S3. Secondary lime addition: Put the lime slurry obtained in S2 into a horizontal spiral stirring digester, add a certain amount of quicklime raw material again, fully stir and continue to digest to obtain slaked lime pe...

Embodiment 2

[0032] A process for producing hydrated lime as a highly active desulfurizer, comprising:

[0033] S1. Crushing: Put the quicklime block into the pulverizer through the silo for crushing to obtain the raw material of quicklime particles with a particle size of 10mm. processing in one step.

[0034] S2. Pre-digestion: put the quicklime particle raw material and digested water obtained in S1 into a vertical digester and mix them thoroughly for digestion to obtain lime slurry. In this step, the digestion temperature is 100° C., the digestion time is 5 minutes, and the digestion water includes by mass parts: 10% calcium ion complexing agent, 3% dispersant, and the rest is water. The rotating speed of the vertical digester is 100r / min.

[0035] S3. Secondary lime addition: Put the lime slurry obtained in S2 into a horizontal spiral stirring digester, add a certain amount of quicklime raw material again, fully stir and continue to digest to obtain slaked lime pellets. In this ste...

Embodiment 3

[0038] A process for producing hydrated lime as a highly active desulfurizer, comprising:

[0039] S1. Crushing: Put the quicklime block into the pulverizer through the silo for crushing to obtain the raw material of quicklime particles with a particle size of 3mm. processing in one step.

[0040] S2. Pre-digestion: put the quicklime particle raw material and digested water obtained in S1 into a vertical digester and mix them well for digestion to obtain lime slurry. In this step, the digestion temperature is 60° C., the digestion time is 8 minutes, and the digestion water includes by mass parts: 2% calcium ion complexing agent, 1% dispersant, and the rest is water. The speed of the vertical digester is 90r / min.

[0041]S3. Secondary lime addition: Put the lime slurry obtained in S2 into a horizontal spiral stirring digester, add a certain amount of quicklime raw material again, fully stir and continue to digest to obtain slaked lime pellets. In this step, the amount of sup...

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Abstract

The invention discloses a production process of slaked lime, a high-activity desulfurizer, comprising: S1, mechanically crushing quicklime blocks to obtain quicklime particle raw materials with particle diameters of 2-10 mm; S2, digesting quicklime particle raw materials and digested water to obtain lime Slurry; S3. Supplement a certain amount of quicklime raw material to the lime slurry, stir and digest to obtain slaked lime pellets. In this step, the digestion temperature is 70-110°C, the digestion time is 20-60min, and the consumption of the supplemented quicklime raw material accounts for 20-40% of the total lime mass, the mass ratio of digested water and slaked lime granules in the slaked lime granules is (0.6-1):1; S4, remove impurities and separate the slaked lime granules to obtain slaked lime with desulfurization function Powder. The invention combines wet and dry digestion processes, fully utilizes the heat released by the digestion reaction itself, and solves the problems of low conversion rate of slaked lime, large powder particles, small specific surface area and low porosity in the traditional dry process .

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization agent production, and in particular relates to a production process of high-activity desulfurization agent slaked lime. Background technique [0002] The semi-dry flue gas desulfurization technology has the advantages of no acid-containing sewage discharge, low investment, small corrosion of equipment, small temperature drop in the desulfurization process, and no secondary pollution. It has been widely used in thermal power, glass, and cement industries, but the use of desulfurizers The efficiency and desulfurization efficiency are lower than wet desulfurization. Highly active slaked lime desulfurizer is an important prerequisite for the desulfurization performance of this process. [0003] At present, in the circulating fluidized bed flue gas desulfurization process and system used in my country, the traditional mechanical stirring method is usually used to digest quicklime into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/04C01F11/02
CPCC04B2/04C01F11/02C01P2006/12C01P2004/61
Inventor 余剑王超杨娟
Owner NANJING WEIHENG EXPERIMENTAL EQUIP CO LTD
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