Method for ammonia method desulfurization of flue gas and high-purity solid ammonium sulfite by-producing

A technology for ammonium sulfite and ammonia desulfurization, which is applied in ammonium sulfite, separation methods, chemical instruments and methods, etc., can solve the problem of high cost, comprehensive utilization of resources and environmental protection issues, and the number of products. limited issues

Active Publication Date: 2012-09-12
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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  • Method for ammonia method desulfurization of flue gas and high-purity solid ammonium sulfite by-producing
  • Method for ammonia method desulfurization of flue gas and high-purity solid ammonium sulfite by-producing

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 ammonia method desulfurization of flue gas and high-purity solid ammonium sulfite by-producing. The method comprises the following steps that: solid substances rich in sulfur are firstly burnt to generate the flue gas rich in high concentration sulfur dioxide gas; the flue gas enters into a cyclone separator for dedusting, and the dedusted flue gas enters into a heat exchanger for temperature reduction; then the flue gas enters into a washing and purifying tower to be washed; the flue gas respectively enters into a primary absorption tower, a secondary absorption tower and a third absorption tower for absorption, the high concentration ammonium bisulfite solution generated through reaction is taken out from a bottom groove of the primary absorption tower and is neutralized in a neutralization tank after volume and concentration measurement, and the solid ammonium sulfite is separated by a centrifuge in the neutralization tank through cooling crystallization; and the flue gas enters into a washing tower to be discharged after washing. By the method, SO2 and other harmful acidic gas are highly purified; the utilization ratio of an ammonia absorption agent is effectively improved; high-purity solid ammonium sulfite can be obtained; and the ammonium sulfite solution has excellent special industrial use and prospect.

Description

Technical field [0001] The present invention is a method of preparing ammonium sulfate. More precisely, it is a method of smoky ammonia and sulfulus and high -purity solid sulfate. Background technique [0002] Actinium sulfate is an important chemical product (the chemical industry standard of the People's Republic of China, ammonium sulfate, HG / T2784-1996), which is both a kind of fertilizer and a chemical agent.The promotion of pulp making has become increasingly demanding, and will play a larger role in transforming the traditional papermaking industry. [0003] Ammonium sulfate is one of the most common by -products in ammonia desulfurization technology.The ammonia desulfurization technology uses ammonia as an absorbent to remove SO in flue gas 2 Process.The ammonia desulfurization process has many characteristics. First of all, ammonia is a good alkaline absorbent. The alkali is stronger than the calcium -based absorbent, and the sulfur dioxide in the ammonia absorbing smok...

Claims

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Application Information

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Patent Type & Authority Applications(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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