CN108970350A - 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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- CN108970350A CN108970350A CN201810627857.4A CN201810627857A CN108970350A CN 108970350 A CN108970350 A CN 108970350A CN 201810627857 A CN201810627857 A CN 201810627857A CN 108970350 A CN108970350 A CN 108970350A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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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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- 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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D53/74—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
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/102—Oxygen
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
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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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- B01D2251/00—Reactants
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- B01D2251/306—Alkali metal compounds of potassium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
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- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B01D2251/604—Hydroxides
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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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) cooling flue gas in flue is to 40 DEG C or less；(2) prepare nitre absorbing liquid, and be introduced into absorption tower；(3) flue gas is passed through absorption tower, flue gas is in contact with nitre absorbing liquid, and absorbing liquid absorbs the nitre in flue gas；(4) flue gas after denitration is emptied.Present invention process is simple and easy, and use cost is low, can carry out denitration using both having ready conditions using power plant, steel mill.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 energy 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 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 ring
Benefit is protected, good economic effect is more preferably generated, there is 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) flue gas in flue is cooled down to 40 DEG C or less；
(2) prepare nitre absorbing liquid, and be introduced into absorption tower；
(3) flue gas is passed through absorption tower, flue gas is in contact with nitre absorbing liquid, and absorbing liquid absorbs in flue gas
Nitre；
(4) flue gas after denitration is emptied.
Further, the type of cooling of the flue gas in step (1) is that heat exchanger is cooling, water-washing method is cooling, air-cooled side
One of formula cooling or its combination.
Further, the temperature of flue gas is not higher than 30 DEG C in step (1).
Further, the temperature of flue gas is not higher than 20 DEG C in step (1).
Further, purified treatment first is carried out to flue gas before step (1), purified treatment includes desulfurization and dust removal process.
Further, in step (2) nitre absorbing liquid be potassium hydroxide, sodium hydroxide, calcium hydroxide, magnesium hydroxide aqueous solution
And one of ammonium hydroxide or several combinations.
Further, nitre absorbing liquid is water in step (2).
Further, step (2) absorption tower is any one of spray column, plate column or packed tower.
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 the decline with temperature and speed is accelerated, though the mechanism of the theory is proved already, 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, be not directed to the big novelty of of the invention one, i.e., for flue gas itself,
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.
Flue gas 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:
Partial fume is shunted from desulfurizing tower exit and is exported, into a heat exchanger, the hot journey of heat exchanger is flue gas, and cold journey is cold
But medium.The temperature of cooling medium is adjusted, flue gas temperature at heat exchanger exit is adjusted.Flue gas enters after coming out from heat exchanger
One absorption tower sets spray thrower in absorption tower, and absorbing liquid is the NaOH solution of 0.1M, keeps the temperature and heat exchanger flue gas of absorbing liquid
The temperature in exit is consistent.Thermometer is installed in flue gas heat-exchange unit exit and absorption tower；It is set in adsorption tower smoke exit
Nitric oxide detector is set, to measure experimental data.
When flue-gas temperature is 62 DEG C, NO concentration is 601.48ppm after absorption.
When flue-gas temperature is 50 DEG C, NO concentration is 578.16ppm after absorption.
When flue-gas temperature is 40 DEG C, NO concentration is 420.10ppm after absorption.
When flue-gas temperature is 30 DEG C, NO concentration is 194.96ppm after absorption.
When flue-gas temperature is 20 DEG C, NO concentration is 105.60ppm after absorption.
When flue-gas temperature is 18 DEG C, NO concentration is 92.78ppm 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, is not necessarily to denitration at high temperature, without using catalyst,
Also the oxidant for not needing the highly energy-consumings such as similar ozone and hydrogen peroxide, saves cost；
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) purified treatment first is carried out to flue gas, purified treatment includes desulfurization and dust removal process；The cooling cigarette in flue
Road tail gas is to 50 DEG C；The type of cooling of flue gas is one of cooling heat exchanger, water-washing method cooling, air cooling way cooling
Or its combination.
(2) prepare nitre absorbing liquid, and be introduced into absorption tower；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, hydroxide
One of calcium, the aqueous solution of magnesium hydroxide and ammonium hydroxide or several combinations.Wherein nitre absorbing liquid may be water.It absorbs
Tower is any one of spray column, plate column or packed tower.
(3) flue gas is passed through absorption tower, flue gas is in contact with nitre absorbing liquid, and absorbing liquid absorbs in flue gas
Nitre；
(4) flue gas after denitration is emptied.
Embodiment 2:
The following steps are included:
(1) purified treatment first is carried out to flue gas, purified treatment includes desulfurization and dust removal process；The cooling cigarette in flue
Road tail gas is to 40 DEG C；The type of cooling of flue gas is one of cooling heat exchanger, water-washing method cooling, air cooling way cooling
Or its combination.
(2) prepare nitre absorbing liquid, and be introduced into absorption tower；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, hydroxide
One of calcium, the aqueous solution of magnesium hydroxide and ammonium hydroxide or several combinations.Wherein nitre absorbing liquid may be water.It absorbs
Tower is any one of spray column, plate column or packed tower.
(3) flue gas is passed through absorption tower, flue gas is in contact with nitre absorbing liquid, and absorbing liquid absorbs in flue gas
Nitre；
(4) flue gas after denitration is emptied.
Embodiment 3:
The following steps are included:
(1) purified treatment first is carried out to flue gas, purified treatment includes desulfurization and dust removal process；The cooling cigarette in flue
Road tail gas is to 30 DEG C；The type of cooling of flue gas is one of cooling heat exchanger, water-washing method cooling, air cooling way cooling
Or its combination.
(2) prepare nitre absorbing liquid, and be introduced into absorption tower；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, hydroxide
One of calcium, the aqueous solution of magnesium hydroxide and ammonium hydroxide or several combinations.Wherein nitre absorbing liquid may be water.It absorbs
Tower is any one of spray column, plate column or packed tower.
(3) flue gas is passed through absorption tower, flue gas is in contact with nitre absorbing liquid, and absorbing liquid absorbs in flue gas
Nitre；
(4) flue gas after denitration is emptied.
Embodiment 4:
The following steps are included:
(1) purified treatment first is carried out to flue gas, purified treatment includes desulfurization and dust removal process；The cooling cigarette in flue
Road tail gas is to 20 DEG C；The type of cooling of flue gas is one of cooling heat exchanger, water-washing method cooling, air cooling way cooling
Or its combination.
(2) prepare nitre absorbing liquid, and be introduced into absorption tower；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, hydroxide
One of calcium, the aqueous solution of magnesium hydroxide and ammonium hydroxide or several combinations.Wherein nitre absorbing liquid may be water.It absorbs
Tower is any one of spray column, plate column or packed tower.
(3) flue gas is passed through absorption tower, flue gas is in contact with nitre absorbing liquid, and absorbing liquid absorbs in flue gas
Nitre；
(4) flue gas after denitration is emptied.
Embodiment 5
The following steps are included:
(1) purified treatment first is carried out to flue gas, purified treatment includes desulfurization and dust removal process；The cooling cigarette in flue
Road tail gas is to 18 DEG C；The type of cooling of flue gas is one of cooling heat exchanger, water-washing method cooling, air cooling way cooling
Or its combination.
(2) prepare nitre absorbing liquid, and be introduced into absorption tower；Nitre absorbing liquid is potassium hydroxide, sodium hydroxide, hydroxide
One of calcium, the aqueous solution of magnesium hydroxide and ammonium hydroxide or several combinations.Wherein nitre absorbing liquid may be water.It absorbs
Tower is spray column, plate column or filler
Any one of tower.
(3) flue gas is passed through absorption tower, flue gas is in contact with nitre absorbing liquid, and absorbing liquid absorbs in flue gas
Nitre；
(4) flue gas after denitration is emptied.
Claims (8)
1. a kind of flue gas low-temperature denitration method, it is characterised in that: the following steps are included: (1) cooling cigarette in flue
Road tail gas is to 40 DEG C or less；(2) prepare nitre absorbing liquid, and be introduced into absorption tower；(3) flue gas is passed through absorption tower, cigarette
Gas is in contact with nitre absorbing liquid, and absorbing liquid absorbs the nitre in flue gas；(4) flue gas after denitration is emptied.
2. flue gas low-temperature denitration method according to claim 1, it is characterised in that: the flue gas in step (1)
The type of cooling be that heat exchanger is cooling, water-washing method is cooling, air cooling way is one of cooling or its combination.
3. flue gas low-temperature denitration method according to claim 1, it is characterised in that: flue gas in step (1)
Temperature is not higher than 30 DEG C.
4. flue gas low-temperature denitration method according to claim 1, it is characterised in that: flue gas in step (1)
Temperature is not higher than 20 DEG C.
5. flue gas low-temperature denitration method according to claim 1, it is characterised in that: first to flue tail before step (1)
Gas carries out purified treatment, and purified treatment includes desulfurization and dust removal process.
6. flue gas low-temperature denitration method according to claim 1, it is characterised in that: nitre absorbing liquid is in step (2)
One of potassium hydroxide, sodium hydroxide, calcium hydroxide, the aqueous solution of magnesium hydroxide and ammonium hydroxide or several combinations.
7. flue gas low-temperature denitration method according to claim 1, it is characterised in that: nitre absorbing liquid is in step (2)
Water.
8. flue gas low-temperature denitration method according to claim 1, it is characterised in that: step (2) absorption tower is spray
Any one of tower, plate column or packed tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810627857.4A CN108970350A (en) | 2018-06-19 | 2018-06-19 | A kind of flue gas low-temperature denitration method |
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| CN201810627857.4A CN108970350A (en) | 2018-06-19 | 2018-06-19 | A kind of flue gas low-temperature denitration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647132A (en) * | 2018-12-29 | 2019-04-19 | 山东师范大学 | A kind of rotary active carbon flue gas desulfurizing device |
| CN110893313A (en) * | 2019-07-27 | 2020-03-20 | 齐金禄 | Method for treating waste gas containing nitrogen oxides |
-
2018
- 2018-06-19 CN CN201810627857.4A patent/CN108970350A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647132A (en) * | 2018-12-29 | 2019-04-19 | 山东师范大学 | A kind of rotary active carbon flue gas desulfurizing device |
| CN110893313A (en) * | 2019-07-27 | 2020-03-20 | 齐金禄 | Method for treating waste gas containing nitrogen oxides |
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