CN105289263A - Hydrogen peroxide denitration process and denitration system - Google Patents
Hydrogen peroxide denitration process and denitration system Download PDFInfo
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- CN105289263A CN105289263A CN201510851582.9A CN201510851582A CN105289263A CN 105289263 A CN105289263 A CN 105289263A CN 201510851582 A CN201510851582 A CN 201510851582A CN 105289263 A CN105289263 A CN 105289263A
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- hydrogen peroxide
- denitration
- denitrating
- gas
- flue gas
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Abstract
The invention relates to a hydrogen peroxide denitration process and a corresponding denitration system. According to the denitration process, hydrogen peroxide is taken as an oxidant; .OH is generated through high-temperature and high-pressure catalysis of hydrogen peroxide; .OH is mixed with flue gas, so that nitrogen oxides in the flue gas can be oxidized and recovered; finally, the obtained mixture is subjected to gas-liquid separation, denitration by-products, namely nitric acid and a nitrous acid liquid, are recovered, and the flue gas subjected to denitration is discharged to the outside. The denitration process and the denitration system have the advantages that hydrogen peroxide is taken as the denitration oxidant; through the mixing of hydrogen peroxide and high-temperature steam, hydrogen peroxide tends to be decomposed into hydroxy radical.OH and HO2., so that the nitrogen oxides oxidation and recovery effects are improved, the denitration rate is increased, and the temperature limitation is avoided.
Description
Technical field
The invention belongs to industrial denitration technology field, be specifically related to a kind ofly utilize the NOx in hydrogen peroxide oxidation low-temperature flue gas and reclaim technique and the system and device of accessory substance nitric acid.
Background technology
In July, 2011, " fossil-fuel power plant atmospheric pollutant emission standard " (GB13224-2011) are implemented in Environmental Protection Department official approval.Because " fossil-fuel power plant atmospheric pollutant emission standard " (hereinafter referred to as New emission standard) relates to the Pollutant emission concentration control overflow of each thermal power generation unit whole operation phase, and in this " New emission standard ", significantly improve the discharge standard of thermal power plant's atmosphere pollution, to the sulfur dioxide of newly-built, built thermal power plant, the discharge restriction of nitrogen oxide, stricter than the control limit of current standard several times, considerably beyond US and European, become the tightest standard.Simultaneously " New emission standard " to be defined in territorial development density higher, environmental bearing capacity starts to weaken, or atmospheric environment capacity is less, ecological environment frailty, easy generation serious atmospheric problem of environmental pollution and need strictly to control Air Pollutant Emission key area (not yet specifying key area, city at present), strictly should control the pollutant emission behavior of enterprise, the concentration of emission of key area coal-fired electric generation furnace nitrogen oxide is less than 100mg/m
3.
In order to tackle the new demand of country to discharged nitrous oxides, environment protection, carrying out denitration to nitrogen oxide tail gas is industrial important necessary step.But a lot of industry exhaust temperature is low at home, and traditional denitrating technique is relatively harsh to the requirement of temperature.
Summary of the invention
The object of this invention is to provide a kind of denitrating technique utilizing hydrogen peroxide to be oxidized tail gas, main NO and NO reclaimed in tail gas
2, gained accessory substance nitric acid is as industrial cycle, and technique is simple, and react completely and do not limit by flue-gas temperature, hydrogen peroxide utilization rate is high.
Another object of the present invention is to provide the denitrating system matched with above-mentioned denitrating technique, uses as the continuous denitration of tail gas.
The present invention's adopted technical scheme that solves the problem is: a kind of hydrogen peroxide denitrating technique, using hydrogen peroxide as oxidant, by HTHP, hydrogen peroxide catalysis is generated OH, described HTHP is that hydrogen peroxide is directly heated to 400 ~ 500 DEG C, and the extra pressure that hydrogen peroxide produces is that 1.6 ~ 2.0KPa, OH mix with flue gas, make the oxidized recovery of the nitrogen oxide in flue gas, final mixture is through gas-liquid separation, and reclaim denitration accessory substance nitric acid and nitrous acid solution, the flue gas after denitration is arranged outward;
Chemical equation is
H
2O
2→2·OH
H
2O
2+·OH→HO
2·+H
2O
NO+HO
2·→NO
2+·OH
NO
2+·OH→HNO
3
NO+·OH→HNO
2
NO+H
2O
2→NO
2+H
2O
H
2O
2+2NO
2→HNO
3。
Preferably, remove the NOx in flue gas in normal temperature situation, solving the mass concentration of traditional denitrating technique to the requirement hydrogen peroxide of temperature is 27.5% ~ 50%.
The technical scheme that the present invention realizes another object is, hydrogen peroxide denitrating system, comprise the hydrogen peroxide storage tank set gradually, catalytic unit, denitrating tower, electrostatic nitric acid separator and nitric acid storage tank, described denitrating tower is configured with atomizer, connection pipeline between described hydrogen peroxide storage tank and described atomizer is provided with the catalytic unit heating hydrogen peroxide, hydrogen peroxide enters denitrating tower after being catalyzed into OH, gas approach is provided with bottom denitrating tower, flue gas enters denitrating tower from gas approach, and mix reverse with OH generates nitric acid from lower to upper, described electrostatic denitrated acid separator and denitrating tower are connected, from denitrating tower top, mixing gas out enters electrostatic denitrated acid separator and carries out gas-liquid separation, the liquid-phase outlet of electrostatic denitrated acid separator takes over described nitric acid storage tank, the gaseous phase outlet of electrostatic denitrated acid separator connects air.
Flue-gas denitration process of the present invention adopts hydrogen peroxide to pass through HTHP, hydrogen peroxide obtains catalysis and produces more hydroxy radical group OH and HO2, react with nitrogen oxides in effluent, directly obtain nitric acid or nitrous acid, improve denitration effect, denitration is thoroughly complete, high-temperature steam can make hydrogen peroxide tend to be decomposed into the reaction of hydroxy radical, oxidability due to hydroxy radical will be far longer than the oxidability of hydrogen peroxide self, thus can obtain higher denitration effect, improve the denitration of hydrogen peroxide.
Invention additionally provides the denitrating system that a set of and above-mentioned denitrating technique matches, structure is simple, is convenient to assembly and adjustment.
Compared with prior art, the invention has the advantages that: provide the technique utilizing hydrogen peroxide to remove the nitrogen oxide in flue gas, not by flue-gas temperature restriction, principle simply, improve the denitration effect of hydrogen peroxide, denitration reaction is thoroughly complete.
Accompanying drawing explanation
Fig. 1 is the structure chart of hydrogen peroxide denitrating system in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
A kind of hydrogen peroxide denitrating technique, hydrogen peroxide using 50% is as oxidant, by HTHP, hydrogen peroxide catalysis is generated OH, HTHP is that hydrogen peroxide is directly heated to 400 ~ 500 DEG C, the extra pressure that hydrogen peroxide produces is that 1.6 ~ 2.0KPa, OH mix with flue gas and (be mainly NO and NO to the nitrogen oxide in flue gas
2deng) carrying out oxid-reclamatiom, final mixture, through gas-liquid separation, reclaims denitration accessory substance nitric acid and nitrous acid solution, and the flue gas after denitration can be arranged directly outward;
Concrete chemical equation is
H
2O
2→2·OH
H
2O
2+·OH→HO
2·+H
2O
NO+HO
2·→NO
2+·OH
NO
2+·OH→HNO
3
NO+·OH→HNO
2
NO+H
2O
2→NO
2+H
2O
H
2O
2+2NO
2→HNO
3。
Above-mentioned denitrating technique is realized by following system and device,
Hydrogen peroxide denitrating system, comprise the hydrogen peroxide storage tank 1 set gradually, denitrating tower 2, electrostatic nitric acid separator 3 and nitric acid storage tank 4 and hydrogen peroxide catalytic unit 5, described denitrating tower 2 is configured with atomizer 2.1, catalytic unit 5 for heating hydrogen peroxide is set between described hydrogen peroxide storage tank 1 and described atomizer 2.1, the OH that hydrogen peroxide catalytic unit 5 produces enters denitrating tower 2, gas approach 2.2 is provided with bottom denitrating tower 2, flue gas enters from gas approach 2.2 that denitrating tower 2 is reverse with OH from lower to upper to be mixed, described electrostatic denitrated acid separator 3 is connected with denitrating tower 2, from denitrating tower 2 top, mixing gas out enters electrostatic denitrated acid separator 3 and carries out gas-liquid separation, the liquid-phase outlet of electrostatic denitrated acid separator 3 takes over described nitric acid storage tank 4, the gaseous phase outlet of electrostatic denitrated acid separator 3 connects air.
Above-mentioned hydrogen peroxide denitrating technique, using hydrogen peroxide as denitration oxidant, by HTHP catalysis, makes hydrogen peroxide tend to be decomposed into hydroxy radical OH and HO
2, improve the oxid-reclamatiom effect to nitrogen oxide, improve denitration rate.It is simple that the denitrating system mated with denitrating technique has structure, easy to operate advantage.
Claims (3)
1. a hydrogen peroxide denitrating technique, it is characterized in that: using hydrogen peroxide as oxidant, by HTHP, hydrogen peroxide catalysis is generated OH, described HTHP is that hydrogen peroxide is directly heated to 400 ~ 500 DEG C, and the extra pressure that hydrogen peroxide produces is that 1.6 ~ 2.0KPa, OH mix with flue gas, make the oxidized recovery of the nitrogen oxide in flue gas, final mixture is through gas-liquid separation, and reclaim denitration accessory substance nitric acid and nitrous acid solution, the flue gas after denitration is arranged outward;
Chemical equation is
H
2O
2→2·OH
H
2O
2+·OH→HO
2·+H
2O
NO+HO
2·→NO
2+·OH
NO
2+·OH→HNO
3
NO+·OH→HNO
2
NO+H
2O
2→NO
2+H
2O
H
2O
2+2NO
2→HNO
3。
2. hydrogen peroxide denitrating technique according to claim 1, is characterized in that: the mass concentration of described hydrogen peroxide is 27.5% ~ 50%.
3. a hydrogen peroxide denitrating system, it is characterized in that: comprise the hydrogen peroxide storage tank set gradually, catalytic unit, denitrating tower, electrostatic nitric acid separator and nitric acid storage tank, described denitrating tower is configured with atomizer, connection pipeline between described hydrogen peroxide storage tank and described atomizer is provided with the catalytic unit heating hydrogen peroxide, hydrogen peroxide enters denitrating tower after being catalyzed into OH, gas approach is provided with bottom denitrating tower, flue gas enters denitrating tower from gas approach, and mix reverse with OH generates nitric acid from lower to upper, described electrostatic denitrated acid separator and denitrating tower are connected, from denitrating tower top, mixing gas out enters electrostatic denitrated acid separator and carries out gas-liquid separation, the liquid-phase outlet of electrostatic denitrated acid separator takes over described nitric acid storage tank, the gaseous phase outlet of electrostatic denitrated acid separator connects air.
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|---|---|---|---|
| CN201510851582.9A CN105289263A (en) | 2015-11-27 | 2015-11-27 | Hydrogen peroxide denitration process and denitration system |
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|---|---|---|---|
| CN201510851582.9A CN105289263A (en) | 2015-11-27 | 2015-11-27 | Hydrogen peroxide denitration process and denitration system |
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| Publication Number | Publication Date |
|---|---|
| CN105289263A true CN105289263A (en) | 2016-02-03 |
Family
ID=55187491
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823717A (en) * | 2017-01-23 | 2017-06-13 | 湖北蔚天环保科技有限公司 | A kind of coke oven flue gas comprehensive treatment system |
| CN107185373A (en) * | 2017-06-12 | 2017-09-22 | 太仓运权化工防腐设备有限公司 | A kind of denitration wastewater waste gas cleaning system |
| CN107308791A (en) * | 2017-06-12 | 2017-11-03 | 太仓运权化工防腐设备有限公司 | A kind of fire coal tail gas desulphurization denitration cleaning system |
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| CN107185373A (en) * | 2017-06-12 | 2017-09-22 | 太仓运权化工防腐设备有限公司 | A kind of denitration wastewater waste gas cleaning system |
| CN107308791A (en) * | 2017-06-12 | 2017-11-03 | 太仓运权化工防腐设备有限公司 | A kind of fire coal tail gas desulphurization denitration cleaning system |
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Application publication date: 20160203 |
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