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A wet denitrification process and device for alkali furnace flue gas with absorbent recycling

A technology of wet denitrification and absorbent, which is applied in the direction of separation methods, gas treatment, chemical instruments and methods, etc., can solve the problems of operation cost, secondary pollution, restrictions on the wide application of wet denitrification, and no application, so as to improve the utilization rate , Improve the heat utilization rate, reduce the effect of smoke temperature

Active Publication Date: 2020-09-18
HANGZHOU TIANLAN ENVIRONMENTAL PROTECTION ENG DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the operating cost of wet denitrification, the secondary pollution caused by ozone escape, and the treatment of nitrate and nitrite in the absorption product, the wide application of wet denitrification is limited.
The above-mentioned patents have been applied in a certain range on coal-fired boilers, but they have not been applied under the special flue gas conditions of alkali furnaces. Therefore, a process for the recyclable use of flue gas wet denitrification absorbents has been developed, so that The low operating cost, low ozone escape and zero wastewater discharge of alkali furnace flue gas denitrification have broad application prospects

Method used

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  • A wet denitrification process and device for alkali furnace flue gas with absorbent recycling
  • A wet denitrification process and device for alkali furnace flue gas with absorbent recycling
  • A wet denitrification process and device for alkali furnace flue gas with absorbent recycling

Examples

Experimental program
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Effect test

Embodiment 1

[0075] A 1440TDS / D alkali recovery furnace with a flue gas volume of 280800m 3 / h, NOx280mg / Nm 3 , SO 2 30mg / Nm 3 Dust concentration 30mg / Nm 3 The initial flue gas passes through the ultra-low emission process. The temperature of the smoke at the place where ozone is sprayed is 150°C, and the molar ratio of ozone to nitrogen oxides in the smoke is n O3 :n NO =0.8; the concentration of ozone injected is 2%; the mol ratio of sodium sulfide to sodium hydroxide is 0.2, the pH value control range in the spray absorption tower is 8, and the replenishment mol ratio of sodium sulfide is n NO :n Na2S =6, the salt concentration TDS of the discharged waste water is controlled at 100000mg / l, the molar ratio of the amino group in the chemical denitrification agent to the nitrite in the waste water is 0.8, and a wet electrostatic precipitator is installed on the top of the spray tower. Spray tower outlet NOx63mg / Nm 3 , SO 2 2.5mg / Nm 3 , Dust concentration 4.3mg / Nm 3 .

Embodiment 2

[0077] A 1440TDS / D alkali recovery furnace with a flue gas volume of 280800m 3 / h, NOx280mg / Nm 3 , SO 2 30mg / Nm 3 Dust concentration 30mg / Nm 3 The initial flue gas passes through the ultra-low emission process. The temperature of the smoke at the place where ozone is sprayed is 130°C, and the molar ratio of ozone to nitrogen oxides in the smoke is n O3 :n NO =0.7; The ozone concentration that sprays into is 4%; Sodium sulfide and sodium hydroxide mol ratio are 0.6, and the pH value control range in the packed absorption tower is 12, and the supplementary quantity mol ratio of sodium sulfide is n NO :n Na2S = 4, the salt concentration TDS of the discharged waste water is controlled at 110000mg / l, the molar ratio of the amino group in the chemical denitrification agent to the nitrite in the waste water is 0-1, and the top of the packed tower is equipped with a wet electrostatic precipitator. Spray tower outlet NOx85mg / Nm 3 , SO 2 5mg / Nm 3 , Dust concentration 3.7mg / Nm...

Embodiment 3

[0079] A 1440TDS / D alkali recovery furnace with a flue gas volume of 280800m 3 / h, NOx280mg / Nm 3 , SO 2 30mg / Nm 3 Dust concentration 30mg / Nm 3 The initial flue gas passes through the ultra-low emission process. The temperature of the smoke at the place where ozone is sprayed is 100°C, and the molar ratio of ozone to nitrogen oxides in the smoke is n O3 :n NO =0.5; the concentration of ozone injected is 1%; the molar ratio of sodium sulfide to sodium hydroxide is 0.1, the pH value control range in the spray absorption tower is 6, and the supplementary molar ratio of sodium sulfide is n NO :n Na2S =8, the salt concentration TDS of the discharged wastewater is controlled at 200,000 mg / l, the molar ratio of the amino group in the chemical denitrification agent to the nitrite in the wastewater is 0.8, and a high-efficiency demister is installed on the top of the spray tower. Spray tower outlet NOx153mg / Nm 3 , SO 2 6.1mg / Nm 3 , Dust concentration 7.5mg / Nm 3 .

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Abstract

The invention discloses an alkaline furnace flue gas wet process denitration process and device capable of cyclically utilizing an absorbent. The process comprises the following steps that (1) alkaline recovery furnace flue gas is subjected to high-temperature electric dust removal, heat exchange temperature reduction and ozone oxidation, and is then conveyed into a wet process absorption tower; denitration absorption liquid in the absorption tower performs cyclical spraying absorption on flue gas; the purified flue gas is discharged out through a chimney; (2) slurry after the flue gas is subjected to spraying absorption is discharged out of the absorption tower; a denitrification agent is added into the slurry; sodium sulfate slurry after the denitrification treatment is conveyed into a black liquor concentration work procedure of the alkaline recovery furnace; concentrated sodium sulfate and black liquid mixed liquid is sprayed into the alkaline recovery furnace; combustion reductionis performed in the alkaline recovery furnace; a combustion reduction product is discharged and is then dissolved and causticized; denitration absorption liquid is regenerated again. The flue gas wetprocess denitration absorbent can be cyclically utilized; the denitration operation cost is low; the denitration absorbent is not consumed; no ozone escape exists; zero waste water discharging is realized.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a process for recyclable use of flue gas wet denitrification absorbents for ultra-low emission of flue gas from alkali recovery furnaces. Background technique [0002] The paper industry is an important industry closely related to the development of the national economy. However, my country's paper industry has a low degree of centralization, serious environmental pollution, and a relatively low recycling rate of waste paper. Resource and environmental issues have become the bottleneck for the sustainable development of the paper industry. As a whole-process pollution prevention and control strategy, cleaner production fully embodies the idea of ​​pollution prevention and focuses on reducing pollution burdens in the production process, thereby reducing the pressure of end-of-life treatment. It is recognized as a sustainable development technical means and realization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/56B01D53/75B01D53/76B01D53/78B01D53/96
CPCB01D53/56B01D53/75B01D53/76B01D53/78B01D53/96B01D2251/104B01D2251/304B01D2251/604B01D2258/0283
Inventor 王岳军寿冬金吴忠标陈美秀
Owner HANGZHOU TIANLAN ENVIRONMENTAL PROTECTION ENG DESIGN
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