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Granulation method of coal-fired power plant desulfurization gypsum

A technology for desulfurized gypsum and coal-fired power plants, applied in the fields of application, nitrogen fertilizer, inorganic fertilizer, etc., can solve the problem of single components of desulfurized gypsum, and achieve the effect of improving the improvement effect, increasing organic matter, and improving utilization rate

Inactive Publication Date: 2016-12-14
SHANDONG SUNWAY LANDSCAPE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the single defect of desulfurized gypsum in the prior art, and provide a granulation method for desulfurized gypsum in coal-fired power plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for granulating desulfurized gypsum in a coal-fired power plant, the steps are as follows: (1) urea and formaldehyde are added to the desulfurized gypsum suspension, wherein the mol ratio of urea to formaldehyde is 2:1, and the total mass of urea and formaldehyde is 1% of the mass of desulfurized gypsum, then add sulfuric acid solution, the weight ratio of the sulfuric acid to the desulfurized gypsum is 1:100, heat to 60°C, stir and react for 20min, and dry;

[0017] (2) the dried material of step (1) is granulated through a dry forced pressure granulator;

[0018] (3) The granulated material is sprayed with a polyethylene resin solution in a fluidized bed, and evaporated to dryness at 40° C. to form coated desulfurized gypsum particles.

Embodiment 2

[0020] A method for granulating desulfurized gypsum in a coal-fired power plant, the steps are as follows: (1) urea and formaldehyde are added to the desulfurized gypsum suspension, wherein the mol ratio of urea to formaldehyde is 3:1, and the total mass of urea and formaldehyde is 0.5% of the mass of desulfurized gypsum, then add sulfuric acid solution, the weight ratio of the sulfuric acid to the desulfurized gypsum is 1:130, heat to 70°C, stir and react for 10min, and dry;

[0021] (2) the dried material of step (1) is granulated through a dry forced pressure granulator;

[0022] (3) The granulated material is sprayed with an epoxy resin solution in a fluidized bed, and evaporated to dryness at 50° C. to form coated desulfurized gypsum particles.

Embodiment 3

[0024] A method for granulating desulfurized gypsum in a coal-fired power plant, the steps are as follows: (1) urea and formaldehyde are added to the desulfurized gypsum suspension, wherein the mol ratio of urea to formaldehyde is 5:1, and the total mass of urea and formaldehyde is 0.8% of the mass of desulfurized gypsum, then add sulfuric acid solution, the weight ratio of the sulfuric acid to the desulfurized gypsum is 1:150, heat to 80°C, stir and react for 15min, and dry;

[0025] (2) the dried material of step (1) is granulated through a dry forced pressure granulator;

[0026] (3) The granulated material is sprayed with a polyurethane resin solution in a fluidized bed, and evaporated to dryness at 60° C. to form coated desulfurized gypsum particles.

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Abstract

The invention belongs to the technical field of saline alkali soil improvement, and provides a granulation method of coal-fired power plant desulfurization gypsum. The method comprises the steps of: (1) adding urea and formaldehyde to a desulfurization gypsum suspension, then adding a sulfuric acid solution, heating, stirring, and drying; (2) granulating the dried material obtained in the step (1) by a dry high pressure granulator; (3) spraying resin solution to the granulated material in a fluidized bed, and drying to form coated desulfurization gypsum particles. Urea and formaldehyde conduct in-situ synthesis of urea formaldehyde in under sulfuric acid catalytic conditions in the structure of desulfurization gypsum; urea formaldehyde continuously releases in saline alkali soil, and the release rate is further reduced under the effect of desulfurization gypsum; the desulfurization gypsum improves saline land and improves soil fertility; the resin coating further ensures slow release of the effective components in desulphurization gypsum, improves the improvement effect of desulphurization gypsum on saline alkali soil and effective improvement time; and at the same time, degradation of coating helps to increase the organic matters in saline alkali soil.

Description

technical field [0001] The invention belongs to the technical field of saline-alkali land improvement, in particular to a granulation method for desulfurized gypsum in a coal-fired power plant. Background technique [0002] The proportion of coal in my country's energy consumption is about 70%, and my country's SO 2 90% of the emissions come from the burning of coal. Along its desulfurization technology is to control SO 2 The main method of pollution. At present, 85% of the domestic flue gas desulfurization technology is wet limestone / gypsum process, which does not treat 1tSO 2 2.7 tons of desulfurized gypsum will be produced, and the annual output of desulfurized gypsum and other by-product gypsum will exceed 100 million tons. The comprehensive utilization of the by-product gypsum is not only a prerequisite for the normal operation of the desulfurization device, but also can reduce the pressure on the environment and realize the rational utilization of resources. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05C9/02C05G3/80C05G5/38C05D3/00
Inventor 王胜
Owner SHANDONG SUNWAY LANDSCAPE TECH