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Double alkali method flue desulfurizing and dust collecting induction and crystallization process for reuse

A technology for inducing crystallization, desulfurization and dust removal, applied in the environmental field, can solve the problems of sodium salt loss due to crystallization blockage of desulfurizers and pipelines, affecting the energy consumption cycle of the system, etc., and achieves the effects of good effect, low operating cost and large return flow.

Inactive Publication Date: 2006-03-15
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high oxygen content in the flue gas generated under certain working conditions (such as when burning low-sulfur coal), the dissolution of impurities in the dust, and sufficient gas-liquid contact, CaSO is very easy to appear in actual operation. 4 The supersaturation of the desulfurizer and pipeline may cause crystallization blockage or large loss of sodium salt, which seriously affects the energy consumption of the system and the cycle of stable and reliable operation.

Method used

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  • Double alkali method flue desulfurizing and dust collecting induction and crystallization process for reuse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] At a flue gas temperature of 150°C, the inlet flue gas SO 2 The concentration is 2000mg / m 3 , the pH of the desulfurized liquid entering the desulfurizer (i.e. in the regeneration tank) is 9.0, Na + At a concentration of 0.02 mol / L, Ca 2+ The concentration is 20ppm, and the liquid-gas ratio L / G to the flue gas is 3.0L / m 3 .

[0040] The percentage of the amount of the bottom effluent flowing back to the desulfurization absorber accounts for the total amount of effluent, that is, the reflux ratio is 95%.

[0041] The pH value in the crystallization tank is controlled at 8.0, and the induced seed crystal is an appropriate amount of SiO 2 , CaSO 3 , CaSO 4 mixture.

[0042] After the whole system is in operation, the flue gas desulfurization efficiency reaches 90%.

Embodiment 2

[0044] At a flue gas temperature of 150°C, the inlet flue gas SO 2 The concentration is 2000mg / m 3 , the pH of the desulfurized liquid entering the desulfurizer (i.e. in the regeneration tank) is 8.0, Na + At a concentration of 0.01 mol / L, Ca 2+ The concentration is 20ppm, and the liquid-gas ratio L / G to the flue gas is 3.0L / m 3 , the reflux ratio is 85%.

[0045] The pH value in the crystallization tank is controlled at 7.0, and the induced seed crystal is an appropriate amount of SiO 2 .

[0046] After the whole system is in operation, the flue gas desulfurization efficiency reaches 85%.

Embodiment 3

[0048] At a flue gas temperature of 150°C, the inlet flue gas SO 2 The concentration is 500mg / m 3 , when the flue gas temperature is 120°C, the inlet flue gas SO 2 The concentration is 500mg / m 3 , the pH of the desulfurized liquid entering the desulfurizer is 12.0, Na + At a concentration of 0.4 mol / L, Ca 2+ The concentration is 1000ppm, and the liquid-gas ratio L / G to the flue gas is 15.0L / m 3 , the reflux ratio is 90%.

[0049] The pH value in the crystallization tank is controlled at 10.0, and the induced crystal seed is an appropriate amount of SiO 2 , CaCl 2 , CaSO 3 , CaSO 4 , BaSO 4 mixture.

[0050] After the whole system is in operation, the flue gas desulfurization efficiency reaches 99%.

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Abstract

A concentrated slurry and dual-alkali process for desulfurizing, dusting and reclaming fume includes such steps as removing SO2 and dust from fume by the desulfurizing liquid, exhausting clean fume, returning part of resultant liquid base to desulfurizing liquid, pumping its rest in crystallizer, crystallizing, flowing the most of slurry in regenerator while flowing the rest in deposition pool, taking the supernatant from deposition pool and delivering it to regenerator, discharging deposit, and adding lime / lime stone and sodium alkali to said slurry in regenerator for regeneration.

Description

technical field [0001] The invention belongs to the field of environmental technology, and relates to a flue gas treatment process, in particular to a dual-alkali flue gas desulfurization and dedusting induction crystallization recycling process specially used for eliminating the flue gas pollution produced by burning fossil fuels. Background technique [0002] With the improvement of people's awareness of sulfur dioxide and dust pollution, some places have begun to implement strict emission standards, not only requiring the original emission concentration of sulfur dioxide in flue gas to be lower than 650mg / Nm 3 , and the sulfur dioxide content in the treated flue gas must be lower than 150mg / Nm 3 , the dust must be less than 50mg / Nm 3 . In this case, dry desulfurization and dust removal devices are often impossible to realize or operate, and the investment cost is extremely high. [0003] At present, the wet desulfurization and dust removal technology is usually used, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/96B01D53/78B01D53/50
Inventor 吴忠标程常杰李福才王毅
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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