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Method of desulfurizing flue gas by ammonia-magnesium combination and by-producing struvite

A struvite and flue gas technology, applied in the field of ammonia-magnesium combined flue gas desulfurization and by-product struvite

Active Publication Date: 2018-03-13
SINOPEC NANJING ENG & CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, further innovation and development are made on the basis of conventional ammonia-ammonium sulfate desulfurization technology and magnesium-magnesium sulfate method desulfurization technology, solving the problems of conventional conventional ammonia-ammonium sulfate method desulfurization technology and magnesium-magnesium sulfate method desulfurization technology, and reducing by-products Reduce production costs, improve the economic value of by-products, and at the same time solve the problem of secondary pollution caused by ammonia escape and aerosols, and reduce energy consumption

Method used

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  • Method of desulfurizing flue gas by ammonia-magnesium combination and by-producing struvite

Examples

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Embodiment 1

[0113] Taking the treatment of 220t / h boiler flue gas as an example, the flue gas volume is 270000Nm 3 / h (flue gas volume in working condition 398600m 3 / h), inlet flue gas temperature 125°C, inlet flue gas SO 2 Concentration 2000mg / Nm 3 , absorb with ammonia water of 5% (wt) concentration, the pH value of the absorption solution is 5.0-6.3, the absorption temperature is 40-60°C, the pH value of the oxidation process is 4.5-6.5, and the amount of ammonium sulfate produced is 322.99kg / h (24468.8mol / h), the molar number of nitrogen is 4894mol / h, SO 2 The removal rate is about 29%.

[0114] SO containing after ammonia flue gas desulfurization 2 The flue gas enters the magnesium method flue gas desulfurization device, with Mg(OH) 2 Absorbed as a desulfurizer, SO 2 The removal rate is about 69% of the total. Total SO in the two-step desulfurization process 2 The removal rate is 98% of the total amount, the amount of magnesium sulfate produced is 698.625kg / h (5821.88mol / h)...

Embodiment 2

[0122] Taking the treatment of 220t / h boiler flue gas as an example, the flue gas volume is 270000Nm 3 / h (flue gas volume in working condition 398600m 3 / h), inlet flue gas temperature 125°C, inlet flue gas SO 2 Concentration 2000mg / Nm 3 , absorb with ammonia water of 5% (wt) concentration, the pH value of the absorption solution is 5.0-6.3, the absorption temperature is 40-60°C, the pH value of the oxidation process is 4.5-6.5, and the amount of ammonium sulfate produced is 322.99kg / h (24468.8mol / h), the molar number of nitrogen is 4894mol / h, SO 2 The removal rate is about 29%.

[0123] SO containing after ammonia flue gas desulfurization 2 The flue gas enters the magnesium method flue gas desulfurization device, with Mg(OH) 2 Absorbed as a desulfurizer, SO 2 The removal rate is about 69% of the total. Total SO in the two-step desulfurization process 2 The removal rate is 98% of the total amount, the amount of magnesium sulfate produced is 698.625kg / h (5821.88mol / h)...

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Abstract

The invention discloses a method of desulfurizing flue gas by ammonia-magnesium combination and by-producing struvite. The method comprises: A, subjecting sulfur-bearing flue gas to ammonia process desulfurization to obtain ammonium sulfate or ammonium-sulfate-containing solution; B, subjecting the flue gas treated in step A to magnesium process desulfurization to obtain magnesium sulfate or magnesium-sulfate-containing solution; C, mixing the ammonium sulfate or ammonium-sulfate-containing solution of step A, the magnesium sulfate or magnesium-sulfate-containing solution of step B and a phosphate-containing aqueous solution, and adjusting pH of the obtained solution to generate ammonium phosphate crystal. The method of the invention has the advantages that further innovation and development are made based on the conventional ammonia-ammonium sulfate process desulfurization and magnesium-magnesium sulfate process desulfurization, the problems of the conventional ammonia-ammonium sulfate process desulfurization and magnesium-magnesium sulfate process desulfurization are solved, production cost of byproducts is reduced, the economic value of byproducts is increased, the secondary pollution problem due to ammonia escape and aerosol is also solved, and energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for ammonia-magnesium combined flue gas desulfurization and by-product struvite. Background technique [0002] There are many methods of flue gas desulfurization. Among them, the limestone wet method is the most commonly used, but this method needs to consume a large amount of limestone and water, and at the same time produces a large amount of difficult-to-handle by-product calcium sulfate, so it is basically used in the flue gas desulfurization of large power plants. [0003] Ammonia flue gas desulfurization technology uses ammonia as absorbent to remove SO 2 Flue gas purification technology for other pollutants. In the early 1970s, countries such as Japan and Italy began to study ammonia-based flue gas desulfurization technology, and achieved success one after another. However, due to problems such as operating costs, corrosion, and aero...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/50C01B25/45
CPCB01D53/502B01D53/75B01D53/78B01D2251/402B01D2251/60B01D2251/604B01D2258/0283C01B25/451
Inventor 杨春和李贤周辉
Owner SINOPEC NANJING ENG & CONSTR
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