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Method for producing sodium sulfate and sodium nitrate by simultaneous desulfurization and denitrification by soda-citric acid cobalt (II)

A technology of citric acid and sodium sulfate, applied in the direction of alkali metal sulfite/sulfite, alkali metal nitrate, chemical instruments and methods, etc., can solve the secondary pollution of solid waste, cannot recycle sulfur resources, sulfurous acid Low calcium efficiency and other issues, to achieve the effect of high operating costs, high desulfurization and denitrification rate, and large mass transfer resistance

Inactive Publication Date: 2012-10-03
CHENGDU UNIV OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Application No. 02110646.0 discloses ethylenediamine cobalt (II) combined with calcium oxide for desulfurization and denitrification, using calcium oxide to remove SO 2 Calcium sulfite is generated, but the benefit of calcium sulfite is low, so that sulfur resources cannot be recovered, and at the same time, it is easy to cause blockage of equipment and secondary pollution of solid waste
In addition, ethylenediamine is highly volatile

Method used

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  • Method for producing sodium sulfate and sodium nitrate by simultaneous desulfurization and denitrification by soda-citric acid cobalt (II)
  • Method for producing sodium sulfate and sodium nitrate by simultaneous desulfurization and denitrification by soda-citric acid cobalt (II)

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Experimental program
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Effect test

Embodiment 1

[0030] The flue gas desulfurization and denitrification test is carried out in the device shown in the attached figure. The spray tower is a glass spray tower with a diameter of 75mm and a height of 100mm. The gas-liquid two-phase countercurrent flow is 30m in the desulfurization tower. 3 / h, 120L / h of liquid absorption liquid, temperature is 50℃, pH value is 5.5, SO 2 The inlet concentration is 2100ppm, the mass concentration of sodium ions is 5%; the gas flow in the denitrification tower is 30m 3 / h, the liquid spray volume is 100L / h, the temperature is 40°C, the pH value is 8, the NO inlet concentration is 800ppm, the sodium ion concentration is 6%, and the cobalt citrate concentration is 0.10mol / L. SO in flue gas 2 The import and export concentrations of NO and NO were measured by the KM940 flue gas analyzer of the British Kane Company, and the SO was exported after the operation was stable. 2 The concentration is 100ppm, the desulfurization rate is 95.2%, the NO outlet ...

Embodiment 2

[0032] The test device and desulfurization operating conditions are the same as in Example 1, except that the operating conditions of the denitrification tower are changed, and the gas flow in the denitrification tower is 30m 3 / h, the liquid spray volume is 100L / h, the temperature is 40°C, the pH value is 10, the NO inlet concentration is 800ppm, the sodium ion concentration is 6%, and the cobalt citrate concentration is 0.10mol / L. Export SO after stable operation 2 The concentration is 100ppm, the desulfurization rate is 95.2%, the NO outlet concentration is 46ppm, and the desulfurization rate is 94.3%.

Embodiment 3

[0034] The test device is the same as in Example 1, and the gas flow in the desulfurization tower is 20m 3 / h, 80L / h of liquid absorption liquid, temperature is 50°C, pH value is 6, SO 2 The inlet concentration is 3000ppm, the concentration of sodium ion is 6%; the gas flow rate in the denitrification tower is 20m 3 / h, the liquid spray volume is 60L / h, the temperature is 40°C, the pH value is 10, the NO inlet concentration is 600ppm, the sodium ion concentration is 6%, and the cobalt citrate concentration is 0.15mol / L. SO in flue gas 2 The import and export concentrations of NO and NO were measured by the KM940 flue gas analyzer of the British Kane Company, and the SO was exported after the operation was stable. 2 The concentration is 102ppm, the desulfurization rate is 96.6%, the NO outlet concentration is 60ppm, and the desulfurization rate is 90%.

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Abstract

The invention discloses a technology for producing sodium sulfate and sodium nitrate by simultaneous wet flue gas desulfurization and denitrification by soda-citric acid cobalt (II). By the technology, SO2 and NO can be converted into Na2SO4 and NaNO3 respectively, so as to realize reclamation of SO2 and NO. The method is different from the general way of converting NO into N2 by denitration, adopts the conventional absorption process, has a mild operation condition, is performed at a normal temperature and pressure, has high desulfurization and denitrification ratio, is small in investment, and low in operation cost, and the absorption liquid is easy to regenerate.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment and control, specifically the simultaneous desulfurization and denitrification (SO 2 and NOx), especially the technology of producing sodium sulfate and sodium nitrate by simultaneous desulfurization and denitrification of sodium alkali and cobalt(II) citrate wet flue gas. Background technique [0002] In my country's primary energy composition and consumption, coal accounts for as high as 70%, among which coal-fired power plants are my country's coal consumption and sulfur dioxide (SO 2 ) and nitrogen oxide (NOx) emissions. SO 2 And NOx is the main pollutant in the atmosphere, they can produce acid rain, form photochemical smog, destroy ozone, and bring great harm to the environment and human health. According to statistics, in 2006, my country's SO 2 The emission of more than 25 million t, is the world's SO 2 At the same time, the emission of NOx also exceeded 10 million tons, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/60C01D5/00C01D9/00
CPCY02A50/20
Inventor 刘盛余能子礼超曲兵邱伟
Owner CHENGDU UNIV OF INFORMATION TECH
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