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Treatment system and method for nitrite and nitrate absorption liquid after wet flue gas denitration

A nitrite and treatment system technology, applied in the field of treatment systems containing nitrite and nitrate absorption liquid after wet flue gas denitrification, can solve the application range of ion exchanger varieties and cost constraints, high cost is not suitable for large Large-scale treatment of water pollutants, secondary pollution of water quality, etc., to achieve the effect of rapid treatment, simple treatment method and simple process

Active Publication Date: 2019-01-11
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical method is suitable for wastewater treatment with low nitrite content and small treatment volume, but the added oxidizing agent or reducing agent is likely to cause secondary pollution of water quality;
[0007] Membrane separation method also has good water purification quality, but its cost is too high to be suitable for large-scale water pollutant treatment, and the high-concentration wastewater produced needs further treatment;
[0008] The ion exchange method has the advantages of high removal rate and the ability to concentrate and recover useful substances, but its application range is limited by the type and cost of ion exchangers

Method used

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  • Treatment system and method for nitrite and nitrate absorption liquid after wet flue gas denitration

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Effect test

Embodiment 1

[0036] The invention as figure 1 As shown, it includes a desulfurization tower 1 for simultaneous desulfurization and denitrification of the dust-removed and oxidized flue gas through the absorption liquid, and is used to provide an absorption liquid supply system containing alcohol amine ionic liquid additives and ammonia water and a by-product separation and recovery system; The desulfurization tower 1 is provided with a straight chimney, a multi-stage demister 4, a spray layer 3, and a slurry pool 8 from top to bottom; the slurry pool 8 is provided with a double-zone separation sieve plate 2 for the slurry to form a double-zone slurry pool, that is, the absorption zone at the lower part of the slurry pool 8 and the self-decomposition reaction zone at the upper part of the slurry pool 8; the bottom of the slurry pool 8 is connected to the spray layer 3 through the slurry circulation pump 10, and the flue gas after dust removal and oxidation is reversed to the spray slurry Co...

Embodiment 2

[0042] Process flow of the present invention comprises the steps:

[0043] Step 1: Wet Denitrification

[0044] After dedusting and oxidation, the flue gas is sent to the entrance of the desulfurization tower 1, and the absorption zone at the lower part of the slurry pool 8 is added with 0.5-5% ammonia water and 10-30% alcohol amine ionic liquid absorption liquid, The slurry circulation pump 10 sends the absorption liquid to the spray layer 3, sprayed out from the atomizing nozzle, and reacts with the bottom-up dedusted and oxidized flue gas to remove NO 2 and SO 2 , the purified flue gas is dried by the multi-stage demister 4 and then discharged from the chimney at the top of the desulfurization tower 1. Absorption liquid removes NO 2 Then generate the corresponding ammonium nitrate and ammonium nitrite. NO 2 It is mainly absorbed through the oxidation-reduction reaction with sulfite, so most of the absorption liquid is nitrite. The main function of ionic liquid in the r...

Embodiment 3

[0051] With the treatment method described in embodiment 2, in the absorption liquid storage tank 5, the ammoniacal liquor of 2% and the alcohol amine ionic liquid absorption liquid of 15% by mass fraction are prepared in the absorption liquid storage tank 5, and it is transported to the bottom of the slurry pool 8, The absorption liquid is sent to the spray layer 3 through the slurry circulation pump 11, sprayed out from the atomizing nozzle, contacts with the dust-removed and oxidized flue gas from bottom to top, and removes NO therein 2 and SO 2 . Absorption liquid removes NO 2 Then generate the corresponding ammonium nitrate and ammonium nitrite. The absorption solution containing ammonium nitrite and ammonium nitrate enters the self-decomposition reaction zone of the slurry tank 8, and the pH value of this section is controlled to be 5.5, and the temperature of the absorption solution is controlled to be 52°C. Ammonium nitrite can undergo self-decomposition reaction rap...

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Abstract

The invention relates to a treatment system and method for a nitrite and nitrate absorption liquid after wet flue gas denitration. The system comprises a desulfurization tower, an absorption liquid supply system and a by-product separation and recovery system. The top in the desulfurization tower is provided with a direct discharge chimney, the bottom in the desulfurization tower is provided witha slurry tank, a spray layer is arranged between the direct discharge chimney and the slurry tank, a slurry double-zone division sieve plate is arranged in the slurry tank and divides the slurry tankinto a lower absorption zone and an upper self-decomposition reaction zone, the absorption zone is communicated with the absorption liquid supply system and is communicated with a spray pipe of the spray layer, and the by-product separation and recovery system comprises a nitrate evaporation crystallizer and a nitrate solid-liquid separator which are sequentially communicated to the self-decomposition reaction zone. The treatment method comprises wet denitration and absorption liquid denitrification. The treatment process is free of other reactants and treatment devices. The method is simple,does not cause secondary pollution and realizes the resource utilization of the product and the recycling of the additive.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a treatment system and method for absorbing liquid containing nitrite and nitrate after wet flue gas denitrification. Background technique [0002] SO from coal combustion 2 , NO x It is the main pollutant that causes damage to the atmospheric environment. As people pay more attention to atmospheric environmental pollution, coal-fired flue gas desulfurization and denitrification technology has become a research hotspot in flue gas treatment. Among them, pre-oxidation-simultaneous removal technology can be modified on the basis of existing desulfurization equipment, and the investment The cost is relatively low and has attracted much attention. This technology sprays oxidants (such as ozone, sodium chlorite, hydrogen peroxide, etc.) into the flue to oxidize NO into high-valence nitrogen oxides such as NO 2 etc., and then combined with alkaline absorption solution in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/78B01D47/06C02F1/04C01C1/18C02F103/18C02F101/16
CPCB01D47/06B01D53/60B01D53/78C01C1/185C02F1/04C02F2101/166C02F2101/163C02F2103/18Y02A50/20
Inventor 赵婷雯郭中旭姚明宇程广文赵瀚辰杨成龙李阳
Owner HUANENG POWER INT INC
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