A desulfurization method utilizing white clay

The technology of white mud and desulfurization agent is applied in the field of flue gas desulfurization, which can solve the problems of difficult maintenance and high requirements for operation control, and achieve the effects of improving dissociation efficiency, significant economic benefits, and good environmental and social benefits.

Inactive Publication Date: 2021-06-18
HUADIAN QUDONG POWER GENERATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a compact structure, high requirements for operation control during use, and difficulties in maintenance.

Method used

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  • A desulfurization method utilizing white clay
  • A desulfurization method utilizing white clay

Examples

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Effect test

Embodiment 1

[0059] A method of completely using white mud desulfurization, including the following steps, within a time span of 1 hour, when the load of 330MW unit is 80%, the volume flow rate of raw flue gas in the pretreatment section is 1,000,000m 3 / h, its SO 2 Mass concentration 1500mg / m 3 , while adding 0.3t of white mud to prepare the white mud slurry into the pretreatment tower, SO 2 Mass concentration reduced to 1300mg / m 3 Control the pH in the pretreatment tower to fluctuate between 2.5-2.6, and the total dissolved solids to be within 75g / L. During this period, the slurry will circulate and oxidize to produce about 0.5t of solid waste including gypsum; the flue gas will enter the standard absorption section after passing through the demister , add 1.5t to prepare the white mud slurry and pass it into the absorption tower, use an oxidation fan to carry out forced oxidation, control the pH fluctuation in the absorption tower between 5.3-5.4, the total dissolved solids are within...

Embodiment 2

[0061]A method for partially using lime mud desulfurization, including the following steps, within a time span of 1 hour, when the load of 330MW unit is 80%, the volume flow rate of raw flue gas in the pretreatment section is 1,000,000m 3 / h, its SO 2 Mass concentration 1500mg / m 3 , and at the same time add 0.8t to prepare the white mud slurry and pass it into the pretreatment tower, use the oxidation fan to carry out forced oxidation, SO 2 Mass concentration reduced to 1000mg / m 3 Control the pH in the pretreatment tower to fluctuate between 4.2-4.4, and the total dissolved solids are within 80g / L, which meets the pretreatment requirements. During this period, the slurry circulation is forced to oxidize to produce about 1.3t of low-grade gypsum; the flue gas enters after passing through the demister In the up-to-standard absorption section, add 2.5t of limestone powder to prepare limestone slurry and pass it into the absorption tower, use an oxidation fan for forced oxidatio...

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Abstract

The invention discloses a desulfurization method utilizing white clay, which is characterized in that white clay is used as a desulfurizing agent to carry out double-tower desulfurization in two ways: both a pretreatment tower and an absorption tower adopt the white clay, or the pretreatment tower adopts the white clay to remove 20-30% of SO2, and the absorption tower continuously uses limestone to remove residual SO2; a plurality of monitoring indexes are applied to control in the white clay desulfurization process, and the monitoring content comprises the density of white clay slurry and the particle size of solid particles contained in the white clay slurry, the total dissolved solid mass concentration and density of the gypsum slurry. An existing double-tower main body structure is fully utilized, the desulfurization efficiency and the gypsum quality are guaranteed, meanwhile, zero emission of desulfurization waste water is achieved, and the operation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a method for desulfurizing lime mud, which uses two sections to divide labor and step-by-step desulfurization. Background technique [0002] With the country's emphasis on the environment and the increasingly stringent environmental protection policies, the pollutant discharge standards of thermal power plants are also getting higher and higher. In terms of desulfurization, the vast majority of power plants in my country use wet limestone-gypsum flue gas desulfurization, and some of them choose a technical solution for improving desulfurization efficiency by connecting two towers in series. At the same time, with the strengthening of ecological civilization construction, the application environment of the traditional desulfurizer limestone has changed greatly compared with the initial use. The continued large-scale application will not only increase t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/80B01D53/75
CPCB01D53/502B01D53/507B01D53/75B01D53/80B01D53/346B01D2258/0283
Inventor 薛少凡马双忱蔡文丰徐昉徐涛樊帅军李先超李德峰王涛聂晓伟
Owner HUADIAN QUDONG POWER GENERATION CO LTD
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