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Synergist for limestone-gypsum wet flue gas desulfurization

A wet flue gas desulfurization and limestone technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as chloride ions and environmental toxicity, reduce energy loss and operating costs, and improve desulfurization performance. Effect

Active Publication Date: 2011-08-10
ZHEJIANG RUNFENG ENERGY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a limestone-gypsum synergist for wet flue gas desulfurization, which solves the problem that the traditional synergist contains chloride ions and has a toxic effect on the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Will sulfur content 2500-3000mg / m 3 The coal-fired flue gas and the limestone slurry in the pit (density 1180kg / m 3 ) Pass into the desulfurization tower for full contact, the reacted slurry returns to the pit again, and the flue gas is discharged after defogging. At this time, the desulfurization efficiency is about 82%, because the limestone slurry absorbs SO 2 While the pH decreases, add fresh limestone slurry and synergist (weight ratio: citric acid 75%, succinic acid 10%, glutaric acid 10%, sodium sulfate 5%), control the synergist in the limestone slurry The final concentration of the limestone slurry is 600ppm, the pH of the limestone slurry is maintained between 5.0-5.8, while part of the gypsum and wastewater are separated, and the flue gas desulfurization efficiency is increased to 90%.

Embodiment 2

[0022] The sulfur content is 200-3200mg / m 3 The coal-fired flue gas and the limestone slurry in the pit (density 1180kg / m 3 ) Pass into the desulfurization tower for full contact, the reacted slurry will return to the pit, and the flue gas will be discharged after defogging. At this time, the desulfurization efficiency is about 80%, because the limestone slurry absorbs SO 2 While the pH decreases, add fresh limestone slurry and synergist (weight ratio: salicylic acid 62%, succinic acid 5%, glutaric acid 9%, adipic acid 5%, sodium formate 10%) to control the increase The final concentration of the effect agent in the limestone slurry is 600ppm, and the pH of the limestone slurry is maintained between 5.0-5.8, while part of the gypsum and wastewater are separated, and the flue gas desulfurization efficiency is increased to 87%.

Embodiment 3

[0024] Will sulfur content 4000-7500mg / m 3 The coal-fired flue gas and the limestone slurry in the pit (density 1180kg / m 3 ) Pass into the desulfurization tower for full contact, the reacted slurry returns to the pit, and the flue gas is discharged after defogging. At this time, the desulfurization efficiency is about 76%, because the limestone slurry absorbs SO 2 While the pH decreases, add fresh limestone slurry and synergist (weight ratio: sulfosalicylic acid 65%, glutaric acid 27%, zinc oxide 8%) to control the final effect of the synergist in the limestone slurry The concentration is 700ppm, the pH of the limestone slurry is maintained between 5.2-6.0, while part of the gypsum and waste water are separated, and the flue gas desulfurization efficiency is increased to 88%.

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PUM

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Abstract

The invention discloses a synergist for limestone-gypsum wet flue gas desulfurization, which comprises raw materials in percentage by weight: 50-90% of at least one of citric acid, salicylic acid or derivatives of the salicylic, 5-40% of polycarboxylic acid, and 1-10% of alkali metal oxides or alkali metal salts. The synergist has no harms to the environment due to no presence of chloridion and other heavy metals, and can effectively improve the desulfurization performance of a FGD (Flue Gas Desulfurization) system and reduce energy loss and operation cost of the system.

Description

Technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a synergist for limestone-gypsum wet flue gas desulfurization. Background technique [0002] Nowadays, coal-fired power generation has become one of the key ways to obtain electricity at home and abroad. The main pollutants produced by coal combustion are sulfur dioxide, nitrogen oxides and soot. With a large amount of coal consumption, effective control of sulfur dioxide emissions has become the main environmental protection responsibility of every coal-fired power plant. At present, the desulfurization methods of power plants are divided into three types: pre-combustion, in-combustion and post-combustion, with post-combustion treatment being the most critical. The post-combustion desulfurization is called Flue Gas Desulfurization (FDG), and the more common one is limestone-gypsum flue gas desulfurization. [0003] The limestone-gypsum wet flue gas desulfurization pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 吕天昱邓磊商赵健
Owner ZHEJIANG RUNFENG ENERGY ENG