Production process of high-activity desulfurizer 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 cost and hidden safety hazards, and achieve the effect of excellent flow performance, reduced water consumption for digestion, and small particles

Active Publication Date: 2020-07-07
NANJING WEIHENG EXPERIMENTAL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 pr

Method used

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  • Production process of high-activity desulfurizer slaked lime

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Experimental program
Comparison scheme
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Embodiment 1

[0026] like 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 pelle...

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 thoroughly 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 ...

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Abstract

The invention discloses a production process of a high-activity desulfurizer slaked lime. The production process comprises the following steps: S1, mechanically crushing quick lime blocks to obtain aquick lime particle raw material with the particle size of 2-10mm; S2, slaking the quicklime particle raw material and slaking water to obtain lime slurry; S3, supplementing a certain amount of quicklime raw materials into the lime slurry, stirring and digesting to obtain slaked lime granules; wherein in the step, the slaking temperature is 70-110 DEG C, the slaking time is 20-60 minutes, the useamount of the supplemented quicklime raw material accounts for 20-40% of the mass of the total lime, and the mass ratio of slaked water to slaked lime granules in the slaked lime granules is (0.6-1):1; and S4, performing impurity removal treatment and separation treatment on the slaked lime granules to obtain slaked lime powder with a desulfurization function. According to the method, a wet digestion process and a dry digestion process are combined, heat released by a digestion reaction is fully utilized, and the problems that slaked lime obtained through a traditional dry method is low in conversion rate, large in powder particle, adhesive, small in specific surface area and low in porosity are solved.

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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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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