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Process using MN method to remove SO2 in industrial waste gas

A technology for industrial waste gas and SO2, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of limited sales of recovered products, high consumption of raw materials and energy consumption, restrictions on application and production, and reduce energy consumption, low cost and energy consumption, and the effect of meeting desulfurization requirements

Inactive Publication Date: 2015-10-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have certain advantages, there are also some problems: if some will produce waste due to the desulfurization process, which will cause secondary pollution; Application and production; some technologies are not mature enough, the process flow is complicated, the operation is difficult, and some technical problems need to be solved for industrial production
At present, melamine slurry is used to remove SO from flue gas or industrial waste gas 2 research has not been reported

Method used

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  • Process using MN method to remove SO2 in industrial waste gas

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] This example is a power plant (using coal combustion to generate electricity) with a flue gas emission of 12000m 3 / h, including SO 2 0.35% (3500ppm), the flue gas outlet temperature of the combustion furnace is above 85°C. After the dust is removed from the flue gas (1), the temperature is lowered to 55°C, and then sent to the bottom of the spray desulfurization tower (3) and the 4% MN slurry sprayed by the top injector (6) is in countercurrent contact and desulfurization reaction occurs, the amount of slurry Controlled at a liquid-gas ratio of 15L / m 3 and preheat to about 50°C. The sulfurous acid MN slurry generated by desulfurization is sent to the centrifuge (7) for filtration, the filtrate is sent to the MN slurry preparation tank (10) for recycling by the delivery pipe (8), and the filter residue sulfurous acid MN is sent to the regeneration furnace (9) at 100 ~ Dehydration and decomposition of SO at 200°C 2 (13) Gas and MN, SO 2 Sent to make sulfuric acid, M...

Embodiment 2

[0029] This example is a non-ferrous metal smelter with a flue gas emission of 30,000m 3 / h, including SO 2 0.25-0.4%, the actual operation process and steps are the same as in Example 1. The difference is that the equipment used should be appropriately enlarged according to the amount of desulfurization tail gas, that is, the flue gas ratio of the two is 2.5:1, and all equipment can be enlarged according to this ratio. The sulfuric acid produced by desulfurization is 0.286 tons / hour (98 acid), and 6.8 tons of concentrated sulfuric acid is produced every day. because SO 2 The average content is 0.325%, less than 0.35%, the sulfur content of the tail gas will be smaller than that of Example 1, which is more conducive to environmental protection.

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Abstract

The invention discloses a process using an MN method to remove SO2 in industrial waste gas. The process comprises the following steps: preheating MN slurry with a concentration of 4-6% to 40-50 DEG C, conveying the slurry to the top of a desulfurization tower through a conveying pump, spraying down the slurry through a jet, wherein the slurry is in contact and reacts with the counter flow of treated and dedusted flue gas sent in from the bottom of the tower; emptying SO2-removed tail gas; conveying desulfurized slurry into a separator for filtering and separation, wherein the separated liquid is conveyed in to prepare MN slurry for repeated use, the separated solid is conveyed to a regenerator and degraded to MN and SO2 at the temperature of 100-200 DEG C; the MN is recycled and the SO2 is sent for sulfur acid preparation; and the absorption and desulfurization temperature is about 45 DEG C and the liquid-gas ratio is 15 L / m<3>. The process is not high in reaction temperature; the MN slurry can be preheated with residual heat of waste gas, so as to reduce the energy consumption of desulfurization; the desulfurization agent MN can be recycled; the regenerated SO2 after desulfurization can be used for preparing a sulfur acid product; no waste is generated except gas phase; both cost and energy consumption are relatively low; and the process is simple and feasible in procedures and the desulfurization requirement of flue gas or waste gas of medium and large scale industries can be met.

Description

technical field [0001] The invention belongs to the environmental protection field of flue gas or industrial waste gas desulfurization and air pollution prevention and control, and relates to desulfurization and product regeneration, SO 2 Sulfuric acid reprocessing process. Background technique [0002] Air pollution control and prevention of smog weather are major issues that have attracted much attention. Sulfur-containing flue gas or industrial waste gas discharge is one of the important factors causing air pollution, which not only affects people's living environment and health, but also causes severe weather. Therefore, with the continuous development of industrialization, people have developed and researched hundreds of flue gas desulfurization methods, but few of them are actually used in industrial production. At present, there are more than ten kinds of methods used in industry, such as lime / limestone method, sodium sulfite method, double alkali method, basic alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/96
Inventor 吕莉罗洪波邱礼有尹华强
Owner SICHUAN UNIV