Method for automatically controlling desulphurization and denitration by flue gas based on pH value and ORP value and apparatus thereof

A desulfurization, denitrification and flue gas technology, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve the problems of unsatisfactory denitrification efficiency and low efficiency, and achieve resource utilization of by-products, simple process flow, The effect of low investment and operating costs

Inactive Publication Date: 2012-10-10
山东航源环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, it has been proved by experiments that simply relying on ammonia or lye to absorb NO 2 The efficiency is very low, and the overall denitrification efficiency is not ideal

Method used

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  • Method for automatically controlling desulphurization and denitration by flue gas based on pH value and ORP value and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The layout of the flue gas purification device is as follows: figure 1 As shown, the treated flue gas is coal-fired boiler flue gas, and the flue gas, soot, SO 2 and NO x (x=1 or 2) concentration is 5000mg / m 3 , 2000mg / m 3 and 450mg / m 3 , the flue gas temperature at the boiler outlet is 120°C, and the gas volume is 10,000m 3 / h. After Venturi dust removal, the smoke concentration is reduced to 50mg / m 3 . O 3 Oxidize NO, the oxidation rate is about 78%~86%, and the residual ozone concentration at the outlet is 75~90mg / m 3 . Use the ammonium sulfite absorption solution with tetravalent sulfur concentration of 0.8mol / L, control pH value of 6.0~6.5, ORP value of -150mV~-75mV to wash the above pre-oxidized flue gas, the average desulfurization efficiency is about 98%, and the denitrification efficiency is about 98%. The efficiency is about 85%, and the ammonia escape concentration is lower than 4.1mg / m 3 .

Embodiment 2

[0051] The layout of the flue gas purification device is as follows: figure 1 shown. The flue gas is treated the same as the flue gas in Example 1, and the gas volume is 10000m 3 / h. After electrostatic precipitator, the dust concentration is reduced to 80mg / m 3 . The flue gas oxidation process uses O 3 Injection mode occurs, injecting O 3 Concentration 600mg / m 3 , the flue gas NO oxidation rate is 72%~76.5%, and the residual ozone concentration at the outlet is 35~45mg / m 3, using the ammonium sulfite absorption liquid with tetravalent sulfur concentration of 0.8mol / L, pH value of 6.0~6.5, and ORP value of -75mV~-0mV to wash the flue gas. The average flue gas absorption and desulfurization efficiency is about 95%, and the denitrification The efficiency is about 72%, and the ammonia escape concentration is lower than 3.5mg / m 3 .

Embodiment 3

[0053] The layout of the flue gas purification device is as follows: figure 1 As shown, the flue gas treatment situation is the same as in Example 1, and the treatment gas volume is 100m 3 / h. After Venturi dust removal, the smoke concentration is reduced to 50mg / m 3 . The oxidation process uses O 3 Injection method, inject O 3 Concentration 1000mg / m 3 , the flue gas NO oxidation rate is between 85% and 89%, and the residual ozone concentration at the outlet is 100 to 150mg / m 3 . The circulating absorption liquid adopts tetravalent sulfur concentration of 0.8mol / L, the pH is controlled within the range of 5.5~6.0, the ORP value is -150mV~-75mV, NO x (x=1 or 2) The average removal efficiency of absorption is 83%, SO 2 The absorption and removal efficiency is always maintained in the range of 93%~95%, and the ammonia escape concentration is lower than 2.5mg / m 3 .

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Abstract

The invention discloses a method for automatically controlling desulphurization and denitration by flue gas based on pH value and ORP value and an apparatus thereof. The method comprises the following steps: dedusting and preoxidazing flue gas, oxidizing NO to NO2, precleaning and processing flue gas by a prewashing system, then taking ammonium sulfite as a absorption liquid, absorbing SO2 and NOx(x is 1 or 2) in flue gas, keeping the pH value and ORP value of the absorption liquid in a set scope during the absorption process for ensuring the absorption efficiency of desulphurization and denitration as well as operation stability, passing the flue gas through an electric demister, and removing the ammonia mist in the flue gas for preventing the ammonia leakage. When the concentration ratio of the absorption liquid (NH4)2SO3/NH4HSO3 decreases to 0.9, a part of the absorption liquid in a washing tower reservoir is introduced into an ammonium sulfate byproduct treatment system, and the resource and recovery utilization can be realized. The provided desulphurization and denitration method has desulphurization efficiency with more than 95% and denitration efficiency with more than 85%, the ammonia escape amount is lower than 5mg/m<3>, and the sulfur resource can be simultaneously recovered.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and is a flue gas treatment method based on the automatic control technology of the pH value and the ORP value to regulate and control the wet ammonia method absorption liquid, so as to realize synchronous, efficient and stable desulfurization and denitrification. Background technique [0002] The flue gas produced by coal combustion, industrial furnaces and waste incineration contains a large number of pollutants that pollute the atmosphere, including soot, SO 2 and NO x (x=1, 2) etc. where SO 2 with NO x (x=1, 2) will cause environmental problems such as acid rain and photochemical smog, which seriously threaten human's daily life and physical and mental health. Flue gas desulfurization and denitrification play a very important role in ensuring the quality of the atmospheric environment. [0003] Flue gas desulfurization methods are divided into wet, dry and semi-dry method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/60F23J15/06
CPCY02A50/20
Inventor 朱天乐王鸿
Owner 山东航源环境科技有限公司
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