System and method for industrial-boiler flue-gas desulfurization and denitrification

A technology for desulfurization and denitrification, industrial boilers, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of high power consumption, high oxidation cost, small footprint, etc., to improve absorption efficiency and achieve regeneration. The effect of utilization, reduction of oxidation cost and power consumption

Pending Publication Date: 2019-04-19
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantages are small footprint, strong oxidation selectivity, high absorption efficiency, and can achieve SO 2 and NO x comple

Method used

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  • System and method for industrial-boiler flue-gas desulfurization and denitrification

Examples

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Effect test

Embodiment 1

[0035] A kind of industrial boiler flue gas desulfurization and denitrification system of the present invention, such as figure 1 As shown, it includes a desulfurization slurry pool 5; a spray tower 6; an inlet flue 1 of the spray tower 6; a pre-oxidation system 2; an oxidant injection that is connected to the pre-oxidation system 2 and is arranged in the inlet flue 1 for two-way injection System 3; oxidation blower 4, which is used to blow fresh air into the desulfurization slurry pool 5 to forcibly oxidize sulfite to sulfate; desulfurization circulation pump 7; desulfurization spray layer 8, two layers of spray are set in this preferred example To ensure the desulfurization efficiency; the gas-liquid separation layer 9 is used to isolate the desulfurization cycle and the denitration cycle, to ensure the flue gas circulation, and to prevent the denitrification slurry from mixing into the desulfurization cycle area below; the denitrification spray layer 10 is used for double-la...

Embodiment 2

[0043] The present invention is an industrial boiler flue gas desulfurization and denitrification system. The pre-oxidation system 2 and the oxidant injection system 3 respectively use an ozone generator and an ozone injection system. First, the ozone generated by the ozone generator is sprayed into the spray tower 6 by the ozone injection system. The inlet flue 1 of the flue gas oxidizes NO in the flue gas to NO 2 , the flue gas enters the spray tower 6 from the inlet flue 1 of the spray tower 6, and the SO in the flue gas is removed by the limestone gypsum method or the ammonia method 2 , two or more layers of desulfurization spray layer 8 spray to ensure desulfurization efficiency, flue gas enters the denitrification circulation system through the gas-liquid separation layer 9 after desulfurization, under the spraying action of the denitrification spray layer 10 NO 2 Absorbed by the catalyst to form oxidative substances; the denitrification slurry containing oxidative subs...

Embodiment 3

[0047] A kind of method of industrial boiler flue gas desulfurization and denitrification of the present invention comprises the following steps:

[0048] Step 1, pre-oxidation: use the pre-oxidation system 2 to spray an oxidant into the inlet flue 1 of the spray tower 6 to oxidize NO in the flue gas to low-valence NO 2 , the treated flue gas enters the spray tower 6;

[0049] Step 2, desulfurization treatment: the sulfur oxides in the treated flue gas are absorbed in the desulfurization circulation system by the alkaline water-soluble absorbent sprayed by the desulfurization spray layer 8, that is, the desulfurization slurry, to generate sulfite / sulfate; after desulfurization The flue gas rises into the denitrification circulation system after passing through the gas-liquid separation layer 9 such as the liquid holding layer;

[0050] Step 3, denitration treatment: the nitrogen oxides in the flue gas after desulfurization are absorbed by the organic catalyst sprayed on the d...

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Abstract

The invention provides a system and method for industrial-boiler flue-gas desulfurization and denitrification. The system comprises a spraying tower, a pre-positive oxidation system arranged on an inlet flue of the outside of the spraying tower, a desulfurization cycling system, a gas-liquid separation layer and a denitrification cycling system, wherein the desulfurization cycling system, the gas-liquid separation layer and the denitrification cycling system are arranged inside the spraying tower. The method includes the steps of preposition oxidation, desulfuration treatment and denitrification treatment. According to the system, oxidation-method denitrification and oxidation cost and power consumption are reduced, absorption efficiency is improved, recycling of a catalyst is achieved, the problem that products cannot be treated in oxidation-method denitrification is solved, and the system provides a feasible technical proposal for simultaneous desulfurization and denitrification of industrial flue gas. According to the method, a desulfurization spraying layer and a denitrification spraying layer which are located inside the spraying tower is partitioned through a gas-liquid separation device, and therefore it is completed that desulfurization and denitrification are simultaneously conducted; in the method, flue-gas denitrification treatment is conducted based on a phospholipid organic catalyst and a regenerant which are used in a wet desulphurization system, and recycling of the denitrification is conducted with an off-line regenerated catalyst.

Description

technical field [0001] The invention relates to the field of air pollution prevention and control, in particular to a system and method for desulfurization and denitrification of industrial boiler flue gas. Background technique [0002] SO in flue gas from coal-fired boilers 2 , NO x (mainly including NO and NO 2 ) is one of the main pollutants in the atmosphere, causing great harm to human health and the natural environment, and is one of the important causes of photochemical pollution and acid rain. At this stage, both the wet desulfurization system and the dry desulfurization system are sensitive to SO 2 The denitrification of flue gas has remarkable effect and good applicability, and it has a wide range of applications in industry and power industry, and flue gas denitrification has always been the focus and difficulty of pollutant removal. my country's industrial stationary sources of NO x Emissions account for NO x About 70% of the total emissions. Current indus...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/56B01D53/78B01D53/86
CPCB01D53/501B01D53/56B01D53/78B01D53/8625B01D2255/70B01D2251/2067B01D2258/0283
Inventor 赵瀚辰姚明宇李阳杨成龙蔡铭
Owner HUANENG POWER INTERNATIONAL
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