CN108970351A - A kind of flue gas low-temperature denitration method - Google Patents
A kind of flue gas low-temperature denitration method Download PDFInfo
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- CN108970351A CN108970351A CN201810628178.9A CN201810628178A CN108970351A CN 108970351 A CN108970351 A CN 108970351A CN 201810628178 A CN201810628178 A CN 201810628178A CN 108970351 A CN108970351 A CN 108970351A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/78—Liquid phase processes with gas-liquid contact
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- B01D2251/102—Oxygen
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- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
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- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The present invention relates to flue gas processing technology field, in particular to a kind of flue gas low-temperature denitration method.The following steps are included: (1) prepares and cooling nitre absorbing liquid is to 30 DEG C or less；(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；(3) flue gas is passed through absorption tower, flue gas is made to be in contact with nitre absorbing liquid；(4) flue gas after denitration is emptied.Present invention process is simple and easy, and use cost is low, can both be had ready conditions using power plant, steel mill and carry out denitration.The present invention will generate huge environmental benefit, more preferably generate good economic effect, have very big social and economic effect.
Description
(1) technical field
The present invention relates to flue gas processing technology field, in particular to a kind of flue gas low-temperature denitration method.
(2) background technique
Gas denitrifying technology can be divided into dry and wet two major classes at present, wherein the selective catalytic reduction in Dry denitration
(SCR) and selective non-catalytic reduction (SNCR) technology be market most widely used (accounting for about 80% denitrating flue gas market), technology most
Mature denitration technology, principle are the spray reducing agents such as ammonium hydroxide or urea into flue gas, direct at high temperature (or the association of catalyst
With under) with flue gas in NOx occur redox reaction, NOx is reduced into nitrogen and water.But the office that the technology also has it very big
Sex-limited, since chemical reaction needs to carry out at high temperature, and for medium small boiler and Industrial Boiler, exhaust gas temperature is remote
High temperature required for chemical reaction cannot be reached, so, denitration effect is bad when low temperature.In addition, even if high-temperature boiler denitration is imitated
When fruit is good, the reducing agents such as a large amount of ammonia or urea are also consumed, and some new pollutions can be generated simultaneously again.
For this problem, existing relevant unit releases the relevant technologies at present, but mainly based on low-temperature SCR, therefore each list
Position puts into a large amount of financial resources and energy, carries out the research and development of low temperature catalyst.Nevertheless, the use of catalyst to be related to it is high at
The problem of this and hardly possible operate.Also there is technology to abandon the use of catalyst, use oxidizing process instead to absorb the NO in flue gas.It considers
Cost and denitration effect, the oxidant used in oxidizing process at present are mainly ozone and hydrogen peroxide.But the system of ozone and hydrogen peroxide
It is standby to consume a large amount of ability again, economically, it is difficult to be subject to promotion and implementation.
In view of the above technical problems, the present invention provides a kind of oxidizing process flue tail gas method of denitration of brand new ideas, the party
Method had both been not necessarily to denitration at high temperature, without catalyst is used, did not also need the oxidation of the highly energy-consumings such as similar ozone and hydrogen peroxide
Agent, but only original exhaust emissions technique is slightly transformed, that is, it can reach good denitration effect.
The present invention has abandoned traditional denitration idea and method completely, will not only generate huge environmental benefit, more preferable to produce
Raw good economic effect, has very big social and economic effect.
(3) summary of the invention
In order to compensate for the shortcomings of the prior art, the present invention provides a kind of flue gas low-temperature denitration methods.
The present invention is achieved through the following technical solutions:
A kind of flue gas low-temperature denitration method, it is characterised in that:
The following steps are included:
(1) it prepares and cooling nitre absorbing liquid is to 30 DEG C or less；
(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；
(3) flue gas is passed through absorption tower, flue gas is made to be in contact with nitre absorbing liquid；
(4) flue gas after denitration is emptied.
Further, in step (1) nitre absorbing liquid be potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide aqueous solution
And one of ammonium hydroxide or several combinations.
Further, the nitre absorbing liquid in step (1) is water.
Further, in step (1) type of cooling be one of heat exchanger cooling, air cooling way, ice-cold mode or its
In conjunction with.
Further, it is passed through absorption tower again after flue gas is cooling in step (3).
Further, the type of cooling of flue gas be one of heat exchanger cooling, air cooling way, water-cooling pattern or its
In conjunction with.
Further, the temperature of cooling rear pass tail gas is not higher than 60 DEG C.
Further, step (3) flue gas before being passed through absorption tower, first carries out purified treatment；The purified treatment includes
Desulfurization and dust removal process.
Further, absorption tower is any one of spray column, plate column or packed tower in step (2).
Way of thinking of theories of the invention is that for overwhelming majority chemical reaction, temperature is increased, and reaction rate increases, still
2NO+O2=2NO2 reaction is decline with temperature and speed is accelerated, and the mechanism of the theory with proving already, but extremely
The present there is no no technical solution that technology field is applied to carry out oxidation and denitration to NO.
For existing wet desulphurization denitrating technique, either spray process, tower tray method gas immersion method, although can
It is enough that flue gas is cooled down, but general cooling temperature is not less than 50 DEG C, if further cooled down, need to consume multipotency
Amount, and be no advantage to technique.Therefore in the prior art, it is not directed to the big novelty of of the invention one, i.e., to flue gas itself
For,
If being cooled to certain temperature, the NO in flue gas can quickly react with O2, and temperature is lower, and reaction speed is got over
Fastly, react more abundant.
Low-temperature denitration method effect is tested:
The Gas Parameters of certain boiler are as follows: exhaust gas volumn 200000m2/h(operating condition), SO2 concentration 5700mg/m3, dust concentration
1850mg/m3, nitrous oxides concentration 640mg/m3,135 DEG C of flue-gas temperature.
Flue gas treating process are as follows: the flue gas from boiler carries out desulfurization, desulfurization subsequently into desulfurizing tower first through bag-type dust
Mode is wet desulphurization, and desulfurizing agent is calcium hydroxide, and desulfurizing tower is spray column.Desulfurizing tower connect chimney, flue gas after desulfurization from
Chimney discharge.
In the smoke outlet data measured of desulfurizing tower are as follows: SO2 concentration 87mg/m3, dust concentration 78mg/m3, nitrogen oxidation
Object concentration 580mg/m3,62 DEG C of flue-gas temperature, flue gas flow rate 4.2m/s.
Experimentation are as follows:
(1) partial fume is shunted from desulfurizing tower exit and is exported, into a cooling bath, cooling water is passed through in cooling bath, it is cooling
The temperature of water is 30 DEG C, and the entrance of flue gas submerges under liquid level, and thermometer and NO detector is arranged in the smoke outlet of cooling bath.
The temperature for going out cooling bath by adjusting the deep-controlled liquid gas of smoke inlet in water, through measuring, data are as follows:
1, when flue-gas temperature is 54 DEG C, NO concentration is 430.32ppm after absorption；
2, when flue-gas temperature is 48 DEG C, NO concentration is 338.54ppm after absorption；
3, when flue-gas temperature is 38 DEG C, NO concentration is 205.18ppm after absorption.
(2) partial fume is shunted from desulfurizing tower exit and is exported, into a cooling bath, be passed through cooling water in cooling bath,
The temperature of cooling water is 15 DEG C, and the entrance of flue gas submerges under liquid level, and thermometer and NO inspection is arranged in the smoke outlet of cooling bath
Survey instrument.The temperature for going out cooling bath by adjusting the deep-controlled liquid gas of smoke inlet in water, through measuring, data are as follows:
1, when flue-gas temperature is 40 DEG C, NO concentration is 370.10ppm after absorption；
2, when flue-gas temperature is 35 DEG C, NO concentration is 196.95ppm after absorption；
3, when flue-gas temperature is 23 DEG C, NO concentration is 98.43ppm after absorption.
The beneficial effects of the present invention are:
1, present invention process is simple and easy, and use cost is low, can both be had ready conditions using power plant, steel mill and carry out denitration.
2, present invention process is novel, and adsorbent directly adsorbs the nitrogen oxides after being oxidized, then desorbs, be conducive to denitration
The further utilization of product, or reduce energy consumed by processing denitration product；
3, the present invention will generate huge environmental benefit, more preferably generate good economic effect, have greatly society and economic shadow
It rings.
(4) specific embodiment
Embodiment 1:
The following steps are included:
(1) it prepares and cooling nitre absorbing liquid is to 30 DEG C；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide
Aqueous solution and one of ammonium hydroxide or several combinations；Nitre absorbing liquid may be water；It is cooling, air-cooled by heat exchanger
The modes such as mode, ice-cold mode are cooled down；
(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；
(3) flue gas is passed through absorption tower, flue gas is made to be in contact with nitre absorbing liquid；It is passed through suction again after flue gas is cooling
Receive tower；The type of cooling of flue gas is one of heat exchanger cooling, air cooling way, water-cooling pattern or its combination；It is cooling
The temperature of rear pass tail gas is 60 DEG C；
(4) flue gas after denitration is emptied.
Further, step (3) flue gas before being passed through absorption tower, first carries out purified treatment；The purified treatment includes
Desulfurization and dust removal process.
Further, absorption tower is any one of spray column, plate column or packed tower in step (2).
Embodiment 2:
The following steps are included:
(1) it prepares and cooling nitre absorbing liquid is to 25 DEG C；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide
Aqueous solution and one of ammonium hydroxide or several combinations；Nitre absorbing liquid may be water；It is cooling, air-cooled by heat exchanger
The modes such as mode, ice-cold mode are cooled down；
(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；
(3) flue gas is passed through absorption tower, flue gas is made to be in contact with nitre absorbing liquid；It is passed through suction again after flue gas is cooling
Receive tower；The type of cooling of flue gas is one of heat exchanger cooling, air cooling way, water-cooling pattern or its combination；It is cooling
The temperature of rear pass tail gas is 50 DEG C；
(4) flue gas after denitration is emptied.
Further, step (3) flue gas before being passed through absorption tower, first carries out purified treatment；The purified treatment includes
Desulfurization and dust removal process.
Further, absorption tower is any one of spray column, plate column or packed tower in step (2).
Embodiment 3:
(1) it prepares and cooling nitre absorbing liquid is to 20 DEG C；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide
Aqueous solution and one of ammonium hydroxide or several combinations；Nitre absorbing liquid may be water；It is cooling, air-cooled by heat exchanger
The modes such as mode, ice-cold mode are cooled down；
(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；
(3) flue gas is passed through absorption tower, flue gas is made to be in contact with nitre absorbing liquid；It is passed through suction again after flue gas is cooling
Receive tower；The type of cooling of flue gas is one of heat exchanger cooling, air cooling way, water-cooling pattern or its combination；It is cooling
The temperature of rear pass tail gas is 40 DEG C；
(4) flue gas after denitration is emptied.
Further, step (3) flue gas before being passed through absorption tower, first carries out purified treatment；The purified treatment includes
Desulfurization and dust removal process.
Further, absorption tower is any one of spray column, plate column or packed tower in step (2).
Embodiment 4:
(1) it prepares and cooling nitre absorbing liquid is to 18 DEG C；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide
Aqueous solution and one of ammonium hydroxide or several combinations；Nitre absorbing liquid may be water；It is cooling, air-cooled by heat exchanger
The modes such as mode, ice-cold mode are cooled down；
(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；
(3) flue gas is passed through absorption tower, flue gas is made to be in contact with nitre absorbing liquid；It is passed through suction again after flue gas is cooling
Receive tower；The type of cooling of flue gas is one of heat exchanger cooling, air cooling way, water-cooling pattern or its combination；It is cooling
The temperature of rear pass tail gas is 40 DEG C；
(4) flue gas after denitration is emptied.
Further, step (3) flue gas before being passed through absorption tower, first carries out purified treatment；The purified treatment includes
Desulfurization and dust removal process.
Further, absorption tower is any one of spray column, plate column or packed tower in step (2).
Embodiment 5:
(1) it prepares and cooling nitre absorbing liquid is to 15 DEG C；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide
Aqueous solution and one of ammonium hydroxide or several combinations；Nitre absorbing liquid may be water；It is cooling, air-cooled by heat exchanger
The modes such as mode, ice-cold mode are cooled down；
(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；
(3) flue gas is passed through absorption tower, flue gas is made to be in contact with nitre absorbing liquid；It is passed through suction again after flue gas is cooling
Receive tower；The type of cooling of flue gas is one of heat exchanger cooling, air cooling way, water-cooling pattern or its combination；It is cooling
The temperature of rear pass tail gas is 40 DEG C；
(4) flue gas after denitration is emptied.
Further, step (3) flue gas before being passed through absorption tower, first carries out purified treatment；The purified treatment includes
Desulfurization and dust removal process.
Further, absorption tower is any one of spray column, plate column or packed tower in step (2).
Embodiment 6
(1) it prepares and cooling nitre absorbing liquid is to 15 DEG C；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide
Aqueous solution and one of ammonium hydroxide or several combinations；Nitre absorbing liquid may be water；It is cooling, air-cooled by heat exchanger
The modes such as mode, ice-cold mode are cooled down；
(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；
(3) flue gas is passed through absorption tower, flue gas is made to be in contact with nitre absorbing liquid；It is passed through suction again after flue gas is cooling
Receive tower；The type of cooling of flue gas is one of heat exchanger cooling, air cooling way, water-cooling pattern or its combination；It is cooling
The temperature of rear pass tail gas is 30 DEG C；
(4) flue gas after denitration is emptied.
Further, step (3) flue gas before being passed through absorption tower, first carries out purified treatment；The purified treatment includes
Desulfurization and dust removal process.
Further, absorption tower is any one of spray column, plate column or packed tower in step (2).
Claims (9)
1. a kind of flue gas low-temperature denitration method, it is characterised in that: the following steps are included: (1) prepares and cooling nitre absorbing liquid
To 30 DEG C or less；(2) the nitre absorbing liquid of step (1) is introduced into absorption tower；(3) flue gas is passed through absorption tower, make flue gas with
Nitre absorbing liquid is in contact；(4) flue gas after denitration is emptied.
2. flue gas low-temperature denitration method according to claim 1, it is characterised in that: nitre absorbing liquid is in step (1)
One of potassium hydroxide, sodium hydroxide, calcium hydroxide, the aqueous solution of magnesium hydroxide and ammonium hydroxide or several combinations.
3. flue gas low-temperature denitration method according to claim 1, it is characterised in that: the nitre absorbing liquid in step (1)
For water.
4. flue gas low-temperature denitration method according to claim 1, it is characterised in that: the type of cooling is in step (1)
One of heat exchanger cooling, air cooling way, ice-cold mode or its combination.
5. flue gas low-temperature denitration method according to claim 1, it is characterised in that: flue gas is cold in step (3)
But absorption tower is passed through after again.
6. flue gas low-temperature denitration method according to claim 5, it is characterised in that: the type of cooling of flue gas is
One of heat exchanger cooling, air cooling way, water-cooling pattern or its combination.
7. flue gas low-temperature denitration method according to claim 5, it is characterised in that: the temperature of cooling rear pass tail gas
Not higher than 60 DEG C.
8. flue gas low-temperature denitration method according to claim 1, it is characterised in that: step (3) flue gas is logical
Before entering absorption tower, purified treatment is first carried out；The purified treatment includes desulfurization and dust removal process.
9. flue gas low-temperature denitration method according to claim 1, it is characterised in that: absorption tower is spray in step (2)
Drench any one of tower, plate column or packed tower.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110893313A (en) * | 2019-07-27 | 2020-03-20 | 齐金禄 | Method for treating waste gas containing nitrogen oxides |
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Application publication date: 20181211 |