CN205269413U - Desorption device of nitrate in industry tail gas oxidation denitration circulating water - Google Patents

Desorption device of nitrate in industry tail gas oxidation denitration circulating water Download PDF

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Publication number
CN205269413U
CN205269413U CN201521122298.XU CN201521122298U CN205269413U CN 205269413 U CN205269413 U CN 205269413U CN 201521122298 U CN201521122298 U CN 201521122298U CN 205269413 U CN205269413 U CN 205269413U
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China
Prior art keywords
spray column
oxidation
nitrate
tail gas
absorption tower
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Expired - Fee Related
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CN201521122298.XU
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Chinese (zh)
Inventor
姚学民
金国良
刘娟
徐婷
姚庚钰
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HANGZHOU ZHONGBING ENVIRONMENTAL PROTECTION CO Ltd
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HANGZHOU ZHONGBING ENVIRONMENTAL PROTECTION CO Ltd
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Priority to CN201521122298.XU priority Critical patent/CN205269413U/en
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Abstract

The utility model discloses a desorption device of nitrate in industry tail gas oxidation denitration circulating water belongs to environmental protection waste gas pollution control and treatment field. Including ozone generator, fan, oxidation reaction unit, spray column, absorption tower, water pump, circulatory pool, ozone generator pass through the fan be connected to oxidation reaction unit, oxidation reaction unit is connected to the spray column, and the spray column is connected to the absorption tower through the water pump, and the absorption tower is connected to the circulatory pool, and the circulatory pool flows back to the spray column. Under the synergism of fresh air and ozone, the NO in the industry tail gas is NO2 by the oxidation, then generates nitrite, adopts urea directly to convert nitrite into N2, has solved the too big difficult problem of nitrate concentration that generates among the prior art, adding ca (OH) 2 in the circulatory pool and participating in two alkali reactions, both saved the resource, reached getting rid of of in circulation fluid nitrate again, realized that the investment working costs is low, denitration efficiency is high, the circulating water reclamation rate is high.

Description

In a kind of industrial tail gas oxidation and denitration recirculated water, nitrate is de-except device
Technical field
The utility model relates to environmental engineering waste gas pollution control and treatment field, and de-in particular to nitrate in a kind of industrial tail gas oxidation and denitration recirculated water removes device.
Background technology
Thermal power plant, garbage burning factory, cement mill are in burning process process, the NOx gas generated due to the oxidation of nitrogen, there are stimulation human respiratory, infringement animals and plants, damage the ozone layer, cause Greenhouse effect, acid rain and photochemically reactive feature, wherein in the majority with NO, and its pole is insoluble in water, increase the difficulty of waste gas pollution control and treatment.
At present, the main technology of denitrating flue gas has: SCR technology (SCR), selective non-catalytic reduction technology (SNCR), selective non-catalytic reduction technology combined selective catalytic reduction technology (SNCR/SCR), plasma denitration technology, wet flue gas denitration technology etc.
The know-why of SCR technology (SCR) sprays into ammonia in containing the tail gas of NOx, urea or other nitrogenous compound so that it is in NOx be reduced into N2And water, the temperature range of this process is in 315 400 DEG C, and needs catalyzer. This process technology denitration efficiency height, can reach more than 90%; But after this technology is built in boiler economizer, floor space is relatively big, and the consumption of catalyzer is big, catalyzer is easily poisoning, cost of investment and running cost are higher.
The know-why of selective non-catalytic reduction technology (SNCR) sprays into ammonia in containing the tail gas of NOx, urea or other nitrogenous compound so that it is in NOx be reduced into N2And water, reduction reaction carries out in higher temperature range (870 1100 DEG C), it is not necessary to catalyzer. This method does not need catalyzer, and engineering cost reduces greatly; It is arranged on boiler body, it is not necessary to floor space. But the utilization ratio of this technology ammonia is not high, in order to reducing NOx often uses excessive ammonia, it is easy to form the escaping of ammonia, cause equipment corrosion and contaminate environment, form greenhouse gases N2O; The improper burning that also can affect hot coal of running-course control, thus cause more CO to discharge.
SCR technology combined selective non-catalytic reduction technology (SNCR/SCR) has two reaction zones, first by ammonia, the reductive agent of urea or other nitrogenous compound sprays into first reaction zone, and at high temperature, non-catalytic reduction reaction occurs the NOx in reductive agent and flue gas; And then the reductive agent of non-complete reaction is entered the 2nd reaction zone, further denitrogenation, saves the ammonia injection system being arranged in flue, and decreases the consumption of catalyzer; But this technical operation process control is complicated, and the utilization in large-scale industry is less.
Plasma denitration technology utilizes high-energy electron to be activated by the molecule in 60 100 DEG C of flue gases, electronics cracking, generate a large amount of ion, free radical and electronics isoreactivity particle, by the NOX oxidation in flue gas, generating ammonium nitrate with the ammonia react sprayed into, technique is simple simultaneously, by product can be used as fertilizer selling, but current consumption is big, and electrode life is short, expensive.
Wet flue gas denitration technology comprises dioxide peroxide oxidation technology, hydrogen peroxide oxidation technology, potassium permanganate oxidation technology, ozonation technology etc. Dioxide peroxide oxidation technology adopts NaClO2/ NaClO is oxidized NO, and then adopts the sour gas more than NaOH absorption of residual, denitration efficiency height, but solvent-oil ratio is big, cost is expensive; Hydrogen peroxide oxidation technology adopts hydrogen peroxide oxidation NO, and then adopts basic solution to absorb, and there is solvent-oil ratio equally big, the problem of cost costliness; Potassium permanganate oxidation technology adopts alkaline permanganate solution to absorb the method for NOx, denitration efficiency height, the content of KOH taking off apart from material impact NOx in absorbing liquid, KOH reduces the Strong oxdiative ability that will restrict potassium permanganate too soon, reduce the ability of potassium permanganate oxidation NOx, thus the process effect causing waste gas reduces.
Ozonation technology adopts strong oxidizer ozone that NO is oxidized to NO2, and then adopt absorption agent to absorb, owing to ozone has extremely strong oxidation efficiency, it is the technological method of denitration industry most prospect. The main problem existed at present is NO2After being converted into nitrate, the nitrate separation difficulty of high density; Industrial usually nitrate is directly disposed to sink drainage, causes the ammonia nitrogen in sewage higher, severe contamination environment.
Summary of the invention
A difficult problem for secondary pollution is caused based on nitrate concentration height in the recirculated water that existing oxidation and denitration technology exists, directly discharge; the utility model provides the de-of nitrate in a kind of industrial tail gas oxidation and denitration recirculated water and removes device, it is possible to eliminate recirculated water pollutent, recirculated water obtains reuse, reach the object saving resource, protection of the environment.
For solving the problem, the technical solution of the utility model is:
In industrial tail gas oxidation and denitration recirculated water, nitrate is de-except a device, comprises ozonizer, blower fan, oxidation reaction apparatus, spray column, water pump, absorption tower, circulation pond; Described ozonizer is connected to oxidation reaction apparatus by described blower fan; Oxidation reaction apparatus is connected to spray column, and spray column is connected to absorption tower by water pump, and absorption tower is connected to circulation pond, and circulation pond is back to spray column.
Preferably, the described absorption agent in absorption tower is urea.
Preferably, the described replenisher in circulation pond is Ca (OH)2��
In industrial tail gas oxidation and denitration recirculated water, nitrate is de-except a device, and its implementation comprises the following steps:
(1) industrial tail gas is delivered to oxidation reaction apparatus;
(2) fresh air outside introduced by blower fan, is delivered to oxidation reaction apparatus together with the ozone that ozonizer produces;
(3) there is oxidizing reaction with the ozone containing fresh air in industrial tail gas in oxidation reaction apparatus;
(4) gas after oxidizing reaction is delivered to spray column, generates nitrite;
(5) nitrite is delivered to absorption tower, and denitration reaction occurs in absorption tower, and clean gas is by the outer row of top outlet;
(6) it is back to spray column after being regenerated by circulation pond by the water body after denitration.
Preferably, above-mentioned steps (2) introduces fresh air outside, is evenly dispersed in air by ozone, it is to increase the efficiency that in industrial tail gas, NO is oxidized.
Preferably, in above-mentioned steps (3), the NO in industrial tail gas is oxidized to NO2��
Preferably, in above-mentioned steps (4) spray column, not by O3NO and the NO of oxidation2Generate nitrite together;
Preferably, above-mentioned steps (5) is under the sorption of absorption agent urea, and nitrite is converted to N2��
Preferably, Ca (OH) is added in above-mentioned steps (6) circulation pond2So that the salts solution precipitation in solution, and generate NaOH and be back to spray column continuation utilization.
Know-why of the present utility model is: the NO in industrial tail gas is oxidized to NO2, NO and high NO2Generate nitrite in the basic conditions; Urea is adopted to convert nitrite to N2, reach the object of denitration; Meanwhile, the carbonate solution produced in denitrification process adopts Dual alkali precipitation, thoroughly prevents the increase of salts solution in recirculated water.
The beneficial effects of the utility model are: one, adopt fresh air mix with ozone, the even method disperseing ozone, it is to increase the reactivity of oxynitrides in ozone and tail gas, greatly reduces the consumption of ozone; Two, adopt urea that nitrite is directly converted to N2, solve in prior art the excessive difficult or difficult problem that processing cost is high of the nitrate concentration generated; Three, Ca (OH) is added in circulation pond2, with Na2CO3CaCO is generated after reaction3And NaOH, NaOH is back to again in spray column and participates in reaction, namely save resource, reach again the removal of nitrate solution in circulation fluid.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present utility model.
In figure, 1-ozonizer, 2-blower fan, 3-oxidation reaction apparatus, 4-spray column, 5,8-water pump, 6-absorption tower, 7-circulation pond.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the utility model comprises ozonizer 1, blower fan 2, oxidation reaction apparatus 3, spray column 4, water pump 5, absorption tower 6, circulation pond 7, water pump 8. It is delivered to oxidation reaction apparatus 3 together with the fresh air that the ozone that ozonizer 1 produces is introduced with blower fan 2; Industrial tail gas is delivered to oxidation reaction apparatus 3; In oxidation reaction apparatus 3, the NO in ozone cooperative fresh air oxidation industrial tail gas, is oxidized to the oxynitrides of high-valence state; Then it is delivered to spray column 4, generates nitrite, then by urea absorption, generate N-2; Clean flue gas after denitration is by row outside spray column 4 top. The nitrite that spray column 4 produces is delivered to absorption tower 6 by water pump 5, urea absorption nitrite in absorption tower 6, generates N2Rear outer row; The carbonate solution produced is delivered to circulation pond 7, utilizes Dual alkali to remove the pollutent in recirculated water, is then back to spray column 4 by water pump 8, reaches the object of recycle polluted water.
The principal reaction equation of the present embodiment is as follows:
Oxidising process:
2NO+O2��2NO2
NO+O3��NO2+O2
The generative process of nitrite:
NO+NO2+H2O��2HNO2
HNO2+NaOH��NaNO2+H2O
Denitrification process:
2NaNO2+CO(NH2)2��Na2CO3+2N2��+2H2O
Regenerative process:
Na2CO3+Ca(OH)2��CaCO3��+NaOH
2NaOH+SO3��Na2SO4
Na2CO3+SO3+H2O��Na2SO4+CO2��+H2O
Na2SO4+Ca(OH)2��CaSO4��+NaOH��
Below it is only that embodiment of the present utility model has been done simple explanation; it is not to restriction of the present utility model; it can have a lot of distortion, the distortion that any same technical professional carries out according to the utility model, all thinks and belongs to protection domain of the present utility model.

Claims (3)

1. in an industrial tail gas oxidation and denitration recirculated water, the de-of nitrate removes device, it is characterised in that, mainly comprise ozonizer, blower fan, oxidation reaction apparatus, spray column, water pump, absorption tower, circulation pond; Described ozonizer is connected to oxidation reaction apparatus by described blower fan; Oxidation reaction apparatus is connected to spray column, and spray column is connected to absorption tower by water pump, and absorption tower is connected to circulation pond, and circulation pond is back to spray column.
2. in industrial tail gas oxidation and denitration recirculated water according to claim 1, the de-of nitrate removes device, it is characterised in that, it is absorption agent that described absorption tower arranges urea.
3. in industrial tail gas oxidation and denitration recirculated water according to claim 1, the de-of nitrate removes device, it is characterised in that, Ca (OH) is set in described circulation pond2Replenisher.
CN201521122298.XU 2015-12-31 2015-12-31 Desorption device of nitrate in industry tail gas oxidation denitration circulating water Expired - Fee Related CN205269413U (en)

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CN205269413U true CN205269413U (en) 2016-06-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106925117A (en) * 2015-12-31 2017-07-07 杭州中兵环保股份有限公司 The removing means and method of nitrate in a kind of industrial tail gas oxidation and denitration recirculated water

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106925117A (en) * 2015-12-31 2017-07-07 杭州中兵环保股份有限公司 The removing means and method of nitrate in a kind of industrial tail gas oxidation and denitration recirculated water

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160601

Termination date: 20171231

CF01 Termination of patent right due to non-payment of annual fee