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A method for flue gas ammonia desulfurization and by-product high-purity solid ammonium sulfite

A technology for ammonium sulfite and ammonia desulfurization, applied in ammonium sulfite, separation methods, chemical instruments and methods, etc., can solve the problems of comprehensive utilization of resources and environmental protection, limited number of products, and difficulty in production. And other issues

Active Publication Date: 2014-10-15
水泽节(山东)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For food-grade and pharmaceutical-grade solid ammonium sulfite (usually the content of ammonium sulfite can reach 95%), it is difficult to produce it by traditional ammonia desulfurization technology due to process conditions.
The commonly used method for producing high-purity ammonium sulfite basically uses high-grade sulfide minerals as raw materials and adopts a single process to produce ammonium sulfite. Due to the simple pursuit of product optimization, the comprehensive utilization of resources and environmental protection issues are not considered. , the number of products is limited and the cost remains high

Method used

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  • A method for flue gas ammonia desulfurization and by-product high-purity solid ammonium sulfite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Simulated flue gas composition: 78% N 2 , 3% O 2 , 15% SO 2 , 3% CO 2 and water vapor. Flue gas flow: 1m 3 / min. The ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 5-6; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7. test results:

[0026] Flue gas flow rate (m 3 / min) SO after purification 2 Content (ppm) Purified NH 3 Content (ppm) Impurity content in solid ammonium sulfite 1 58 32 5%

Embodiment 2

[0027] Example 2: Simulated flue gas composition: 78% N 2 , 4% O 2 , 10% SO 2 , 7% CO 2 and water vapor. Flue gas flow: 1m 3 / min. The ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 5-6; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7. test results:

[0028] Flue gas flow rate (m 3 / min) SO after purification 2 Content (ppm) Purified NH 3 Content (ppm) Impurity content in solid ammonium sulfite 1 65 28 4%

Embodiment 3

[0029] Example 3: Composition of simulated flue gas: 78% N 2 , 8% O 2 , 7% SO 2 , 5% CO 2 and water vapor. Flue gas flow: 1m 3 / min. The ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7. test results:

[0030] Flue gas flow rate (m 3 / min) SO after purification 2 Content (ppm) Purified NH 3 Content (ppm) Impurity content in solid ammonium sulfite 1 58 62 5%

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Abstract

The invention discloses a method for flue gas ammonia desulfurization and high-purity solid ammonium sulfite as a by-product. Firstly, sulfur-rich solid matter is burned to generate flue gas rich in high-concentration sulfur dioxide gas; the flue gas enters cyclone separation The flue gas after dust removal enters the heat exchanger to cool down; then the flue gas enters the washing and purification tower for washing; the flue gas enters the first-level absorption tower, the second-level absorption tower, and the third-level absorption tower for absorption, and the reaction generated The high-concentration ammonium bisulfite solution is taken out from the bottom tank of the primary absorption tower, and then neutralized in the neutralization tank after measuring the volume and concentration. After cooling and crystallizing, the solid sulfurous acid is separated by the centrifuge in the neutralization tank Ammonium; then the flue gas enters the water washing tower and is washed and discharged. The invention has the characteristics of highly purifying SO2 and other harmful acid gases, effectively improving the utilization rate of ammonia absorbent, etc., and can obtain high-purity solid ammonium sulfite, and has good special industrial applications and prospects.

Description

technical field [0001] The invention belongs to the preparation method of ammonium sulfite, more precisely, it is a method for flue gas ammonia desulfurization and high-purity solid ammonium sulfite by-product. Background technique [0002] Ammonium sulfite is an important chemical product (the standard of the chemical industry of the People's Republic of China, ammonium sulfite for industrial use, HG / T2784-1996), it is not only a kind of fertilizer, but also a chemical agent. The promotion of pulping technology is in increasing demand, and it will play an increasingly important role in transforming the traditional paper industry. [0003] Ammonium sulfite is one of the most common by-products in ammonia desulfurization technology. Ammonia desulfurization technology uses ammonia as an absorbent to remove SO from flue gas 2 craft. The ammonia desulfurization process has many characteristics. First, ammonia is a good alkaline absorbent, which is stronger in alkalinity than ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50C01C1/22
Inventor 郭翠翠
Owner 水泽节(山东)环保科技有限公司
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