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Negative pressure soda liquor absorption technique for oxides of nitrogen waste gas

A technology for lye absorption and nitrogen oxides, which is applied in the fields of emission reduction, energy saving and environmental protection, can solve the problems of high storage and transportation costs, low value of salt products, and large airflow resistance, and achieves high utilization rate, good effect, and reduced The effect of acid depletion

Active Publication Date: 2008-08-20
HUNAN JINWANG BISMUTH
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Problems solved by technology

However, the air flow resistance of the turbulent ball tower 4 is large, which puts forward higher requirements for the induced draft fan 2, the lye delivery pump 5, 6 and other equipment. Its operating power reaches 105 kilowatts, and the energy consumption will also rise linearly with the increase of the processing capacity.
In addition, the value of salt products generated by absorption is low, such as the comprehensive recovery of sodium nitrite can only reach 30-40%
Comprehensive recycling is poor
At the same time, the added lye system is usually corrosive, and its storage and transportation costs are high, and careless operation may easily cause secondary pollution

Method used

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  • Negative pressure soda liquor absorption technique for oxides of nitrogen waste gas

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Embodiment approach

[0027] This embodiment is: a nitrogen oxide waste gas negative pressure lye absorption process, which is mainly composed of a combination of condensation recovery section, negative pressure absorption section and comprehensive recovery section; its process flow is as follows:

[0028] a Condenser 8 is used in the condensation recovery section to combine the nitric acid evaporated by the reaction heat of nitration reactor 1 and the NO produced by nitration reaction XThe gas is condensed, and the evaporated nitric acid is condensed into dilute nitric acid and enters the receiving tank 9 for recovery; the inlet temperature of the condenser is controlled to be 80-90°C, the outlet temperature is ≤40°C, and the pressure is minus 0.05-0.1Mpa; the dilute nitric acid recovered by the receiving tank 9 is Return to nitration reactor 1 to supplement the acid consumption of nitration reactor 1; non-condensable NO X The gas enters the negative pressure absorption section;

[0029] The b ne...

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Abstract

The invention relates to a negative-pressure soda lye absorption craft for the nitrogen-oxide waste gas, belonging to the environment protecting, emission reducing and energy saving technical field, which is characterized in that: the NOx gas brought by nitration reaction flows in a direction under the function of vacuum power, that is, the gas flows through the condenser, the receive pot, the primary absorption pot, the secondary absorption pot, the three-level soda lye pond orderly; the evaporative nitric acid is condensing from gas to liquid into receive pot to store through the condenser; the NOx not condensing enters into the negative-pressure absorption workshop section; the whole working procedure are in series and enclosed totally without leaking; the three levels absorption can assure the tail gas NOx absorbed entirely and not diffused to the atmosphere to pollute the environment, meanwhile the zero-emission is realized.

Description

technical field [0001] The invention relates to a nitrogen oxide waste gas negative pressure alkaline liquid absorption process, and belongs to the technical field of environmental protection, emission reduction and energy saving. Background technique [0002] At present, in the deep processing of non-ferrous metal bismuth salts, a large amount of waste gas containing high concentrations of nitrogen oxides (mainly NO and NO 2 , collectively referred to as NO X ), which will form yellow or brown smoke when discharged in the air, commonly known as "Huanglong". Compared with ordinary flue gas containing a small amount of nitrogen oxides, this kind of gunpowder gas is more harmful, and NO X Exhaust gas not only causes acid rain and acid fog, but also destroys the ozone layer. In addition to causing direct physical and mental damage to nearby residents, it also causes serious damage to the surrounding environment. It is one of the important sources of air pollution. Therefore...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
Inventor 谢大鹏吴祖祥戴艳平何勇
Owner HUNAN JINWANG BISMUTH
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