CN100562354C - Deaminizing denitrifying dehumidification technology and device in the nitrophosphate fertilizer tail gas - Google Patents
Deaminizing denitrifying dehumidification technology and device in the nitrophosphate fertilizer tail gas Download PDFInfo
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- CN100562354C CN100562354C CNB2007101392912A CN200710139291A CN100562354C CN 100562354 C CN100562354 C CN 100562354C CN B2007101392912 A CNB2007101392912 A CN B2007101392912A CN 200710139291 A CN200710139291 A CN 200710139291A CN 100562354 C CN100562354 C CN 100562354C
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Abstract
The invention belongs to the technical field that the chemical fertilizer tail gas clean-up is handled, be specifically related to deaminizing denitrifying dehumidification technology and device in the nitrophosphate fertilizer tail gas, solved in the existing nitrophosphate fertilizer tail gas purified treatment program problems such as effect is limited.Deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas the steps include: to open rotary packed bed, regulates filler rotor speed, introduces nitrophosphate fertilizer tail gas and absorption liquid, and discharge gas-liquid contact back.Described device comprises rotary packed bedly, and rotary packed bed inlet is connected with liquid circulation pump, and rotary packed bed liquid outlet links to each other with the absorption liquid storage tank, and the absorption liquid storage tank is connected with the absorption liquid circulating slot, and the absorption liquid circulating slot is connected with liquid circulation pump.Technology of the present invention has advantages such as deaminizing denitrifying rate height, dehumidification rate height, small investment.Present device is simple in structure, and is easy to operate, compared with prior art advantage such as efficient height, energy consumption is little, flow process is simple, start-stop car convenience.
Description
Technical field
The invention belongs to the technical field that the chemical fertilizer tail gas clean-up is handled, be specifically related to deaminizing denitrifying dehumidification technology and device in the nitrophosphate fertilizer tail gas.
Background technology
Nitrophosphate fertilizer tail gas is because complicated component, be the difficult problem that fertilizer industry is administered always. with nitrophosphate fertilizer is example, the tail gas component difference that various processes produced, adopt the indirect refrigeration technology to produce nitrophosphate fertilizer, contain ammonia, steam, nitrogen oxide etc. in its tail gas, these gases are very harmful to human body.These gases have not only caused serious pollution to environment, have worsened workman's working environment, but also cause the wasting of resources to a certain degree.Ammonia has penetrating odor, and corrosiveness is strong, and concentration reaches 7000mg/m
3The time, can make people's death.Owing to contain a large amount of steam in the gas, make that gas is discharged from chimney after because temperature reduces, form supersaturated vapor, make and contain ammonia in the water of condensation that such drop falls can cause skin damage on the face the people; Nitrogen oxide is very harmful to human body, damage the ozone layer, change the intensity that ultraviolet ray arrives ground, and then have influence on the whole ecological environment, still produce the source of acid rain, the generation that science confirms human numerous disease also with air in nitrogen oxide direct relation is arranged.Therefore, it is particularly important that nitrophosphate fertilizer tail gas is administered, and must handle and could discharge after up to standard.
So far, do not have a kind of technology that pernicious gas in the nitrophosphate fertilizer tail gas can be removed simultaneously both at home and abroad, most of chemical fertilizer factories adopt the method that the pernicious gas in the nitrophosphate fertilizer tail gas is administered respectively, for steam, mainly contain dry method and wet method two big classes.Dry method can be divided into two kinds of chemical absorbing and physical absorptions by principle, carries out as adopting solid to absorb (attached) agent, and efficient is higher, but cost is also high, and it is big to absorb (attached) agent consumption, the regeneration difficulty; Wet method is fallen to wet and is adopted cryogenic fluid to carry out, and principle is for reaching the purpose of dehumidifying by the reduction gas temperature.For ammonia, often adopt water, acid solution to absorb, equipment generally adopts the absorption tower, and is simple in structure, easy to operate, but absorption efficiency is lower, floor space big, capital construction and investment cost height, is subjected to spatial constraints especially.The treatment technology of nitrogen oxide mainly contains dry method and wet method two classes, and dry method treatment technology is only applicable to the low gas purifying technique of concentration, and has shortcomings such as processing cost height, complex process, treating capacity be little; Nitrogen oxide mainly adopts single-stage or multistage absorption techniques such as packed tower, bubble column, sieve-plate tower in the wet method improvement flue gas.Aspect the absorbent selection, enterprise utilizes clear water as absorbent according to own characteristic, or adopts rare nitric acid to carry out Physical Absorption as absorbent; Akaline liquids such as the employing sodium carbonate that also has, NaOH carry out chemical absorbing as absorbent to be handled.Have the researcher to attempt absorbing, using active filler etc., but effect is also very limited, is difficult to reach processing requirements with a plurality of tower series multistages.
Summary of the invention
The present invention provides deaminizing denitrifying dehumidification technology and device in a kind of nitrophosphate fertilizer tail gas in order to solve the problem that exists in the above-mentioned nitrophosphate fertilizer tail gas purified treatment program.
The present invention adopts following technical scheme to realize:
Deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas, two-layer packing layer is rotary packed bed about this process using, wherein lower floor is wet packing layer, the upper strata is the filler stem layer, this technology comprises following processing step: open rotary packed bed, regulate filler rotor speed at 150～2500r/min, introduce rotary packed bed by air inlet and inlet 35～80 ℃ the nitrogenous absorption liquid that contains wet nitrophosphate fertilizer tail gas and 5～30 ℃ of ammonia that contains respectively, contain that ammonia is nitrogenous to contain wet tail gas and the absorption liquid gas liquid ratio is 50～3000: 1, gas-liquid is at the deaminizing denitrifying of lower floor's packing layer contact carrying out gas, liquid after the contact is discharged by leakage fluid dram, the gas of finishing deaminizing denitrifying enters the upper strata packing layer subsequently and finishes dehumidifying, is discharged by exhaust outlet then.The described gas-liquid way of contact is cross-flow or adverse current.Absorption liquid is water, rare nitric acid or acidic ammonium nitrate solution.Rare concentration of nitric acid is 0.1～20%.The acidic ammonium nitrate solution concentration is 1～30%.The acidity of acidic ammonium nitrate absorption liquid adopts nitric acid to carry out adjustment of acidity, guarantees that the pH value is 0.2～6.
Deaminizing denitrifying dehumidification device in the nitrophosphate fertilizer tail gas, comprise rotary packed bed, rotary packed bed inlet is connected with liquid circulation pump, rotary packed bed liquid outlet links to each other with the absorption liquid storage tank, the absorption liquid storage tank is connected with the absorption liquid circulating slot by circulating pump, and the absorption liquid circulating slot is connected with liquid circulation pump.
Two-layer coaxial packing layer is set in rotary packed bed, realizes that deaminizing denitrifying dehumidification is integrated; Following packing layer is wet filler, and absorption liquid evenly distributes therein, realizes the deamination dehumidifying; Last packing layer is a filler stem, plays exsiccation.Between the two-layer packing layer diffuser casing is set, can the gas prompt drop is low, by the packing layer of rotation at a high speed, liquid film, the liquid mist of carrying secretly in the tail gas can be collided in the filler stem layer, coalescence forms drop, reaches the purpose of dehumidifying.Described rotary packed bed employing resistant material, the filler in the packing layer also adopts resistant material.Rotary packed bed device not only can be used as absorption equipment, can make heat exchanger simultaneously.
Technology of the present invention is with rotary packed bed reaction unit as absorption, in conjunction with rotary packed bed characteristics, its structure is improved, adopt absorbent to realize that deaminizing denitrifying dehumidification technology is integrated, and the ammonia in the waste gas, nitrogen oxide etc. are turned waste into wealth, enter in the acid waste water, can realize recycling, purify air simultaneously, improved environment.This technology has advantages such as deaminizing denitrifying rate height, dehumidification rate height, apparatus structure compactness, volume are little, small investment.
Equipment of the present invention, simple in structure, easy to operate, compared with prior art, with advantages such as pernicious gas have the efficient height in the rotary packed bed removal nitrophosphate fertilizer tail gas, energy consumption is little, flow process is simple, the start-stop car is convenient.
Description of drawings
Fig. 1 is the flow chart of deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas
Fig. 2 is rotary packed bed structure chart
Among the figure: the 1-nitrophosphate fertilizer tail gas; 2-is rotary packed bed; 3-absorption liquid storage tank; The 4-circulating pump; The 5-gas flowmeter; The 6-fluid flowmeter; 7-liquid circulating slot; The 8-liquid circulation pump; 9-gas circuit valve; 10-liquid road valve; The 11-frequency converter;
The 2-1-motor; The 2-2-sealing; The 2-3-gas vent; The 2-4-shell; Packing layer under the 2-5-; The 2-6-liquid-inlet; The 2-7-liquid outlet; The 2-8-gas feed; The 2-9-liquid distribution trough; The 2-10-diffuser casing; The last packing layer of 2-11-; The 2-12-rotating shaft
The specific embodiment
Deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas of the present invention comprises the steps:
Open rotary packed bedly 2, rotating speed is transferred to 150～2500r/min, open nitrophosphate fertilizer tail gas 1 inlet gas circuit valve 9, by entering rotary packed bed 2 ground floor packing layer 2-5 after gas flowmeter 5 meterings by regulating frequency converter 11; Absorption liquid enters liquid circulation pump 8 by liquid circulating slot 7, regulates liquid measure by liquid road valve 10 and enter the rotary packed bed 2 packing layer 2-5 of lower floor by certain gas liquid ratio after fluid flowmeter 6 meterings; Gas-liquid is being rotated the absorption process of finishing ammonia and nitrogen oxide in the formed super gravity field of filler at a high speed in this process, gas phase after the absorption enters packing layer 2-11 by diffuser casing 2-10 and finishes dehumidification process, gas behind the deaminizing denitrifying dehumidification is discharged by rotary packed bed gas vent 2-3, realizes qualified discharge; Enter absorption liquid storage tank 3 from rotary packed bed liquid outlet 2-7 behind the ammonia of absorption liquid in absorbing gas, the nitrogen oxide, under the effect of circulating pump 4, enter liquid circulating slot 7, absorption liquid recycles, change when ammonium nitrate concn reaches 40-60% in the absorption liquid, this ammonium nitrate solution can obtain utilizing in multiple fertile production technology.The concentration of ammonia, nitrogen oxide, water capacity is measured in rotary packed bed import and export.
Requiring the nitrophosphate fertilizer tail gas temperature in the described nitrophosphate fertilizer tail gas in the deaminizing denitrifying dehumidification technology is 35～80 ℃, and the absorption liquid temperature is 5～30 ℃; Gas liquid ratio is 50-3000: 1; The gas-liquid way of contact is cross-flow or adverse current; Absorption liquid can be water, rare nitric acid or acidic ammonium nitrate solution; This mainly decides according to each concentration of component in production technology and the gas phase.Because pipeline is longer, and contains a large amount of oxygen in the tail gas, causes that can be similar to the main component of thinking in the nitrogen oxide is nitrogen dioxide.
The reaction equation of finishing during for water when absorption liquid comprises:
NH
3+H
2O→NH
3·H
2O
3NO
2+H
2O→2HNO
3+NO
When absorption liquid was rare nitric acid or ammonium nitrate, the concentration of rare nitric acid was 0.1～20%; Adopting acidic ammonium nitrate solution mainly to be based on as absorbent has superfluous acidic ammonium nitrate solution to consider in the multiple fertile factory, ammonium nitrate solution concentration is 1～30% usually, adopts nitric acid to carry out adjustment of acidity, guarantees that the pH value is 0.2～6;
The reaction equation of finishing is:
NH
3+HNO
3→NH
4NO
3
3NO
2+H
2O→2HNO
3+NO
The main equipment of deaminizing denitrifying dehumidification technology is rotary packed bed 2 in the nitrophosphate fertilizer tail gas of the present invention, and motor 2-1 is connected with rotating shaft 2-12, and rotating shaft and rotary packed bed shell 2-4 have sealing 2-2; Gas enters rotary packed bed 2 bottoms by gas feed 2-8, passes through packing layer 2-5 down vertically; Absorption liquid enters liquid distribution trough 2-9 by rotary packed bed liquid-inlet 2-6, and absorption liquid is radially got rid of to the filler outer rim by the filler inner edge.Utilize in this process under the centrifugal force field (reaching tens to hundred times of acceleration of gravity) that rotary packed bed rotation produces, thinning of liquid film, drop diminish, and produce huge boundary; The renewal rate of liquid film also is greatly improved; Ammonia-containing exhaust enters liquid interface by packing layer by gas phase, reacts with the hydrogen ion of absorption liquid, reaches the purpose that reclaims ammonia; Nitrogen oxide and absorption liquid are strengthened absorption in the tail gas under the super gravity field condition, realize the purpose of purifying nitrogen oxide; The wet tail gas that contains of deaminizing denitrifying enters diffuser casing 2-10 from following packing layer 2-5, and gas speed is descended significantly, contains the last packing layer 2-11 that do not feed liquid phase of wet tail gas by rotating at a high speed then, thereby reaches the purpose of dehumidifying; In this process, the mist film in the gas phase, liquid film, brin realize that in the packing layer of rotation at a high speed coalescence forms big drop, under centrifugal action, radially get rid of to the revolving bed inner walls along packing layer, discharge from liquid outlet 2-7 under the gravity effect.
Handle the nitrophosphate fertilizer tail gas of certain chemical fertilizer factory: the pending amount 50000m of technology
3/ h, 70 ℃ of gas feed temperature, moisture content 20% (humidity 0.1545kg water/kg dry gas) wherein, ammonia concentration 2800mg/m
3, nitrous oxides concentration 740mg/m
3With ammonium nitrate acid waste water is absorption liquid, and concentration is 30%, and the pH value is 0.6,25 ℃ of inlet temperatures, liquid measure 100m
3/ h, i.e. gas liquid ratio 500m
3/ m
3, rotary packed bed filler diameter 2.5m, high 3.5m, the rotary packed bed and filler of its main equipment is resistant material 1Cr18Ni9Ti, the gas-liquid way of contact is cross-flow.
At first open rotary packed bedly, regulating rotating speed by the frequency conversion instrument is 150r/min, treat rotary packed bed stable after, nitrophosphate fertilizer tail gas is introduced rotary packed bed by air-introduced machine, with the absorption liquid counter current contacting, finish absorption process in packing layer.Nitrophosphate fertilizer tail gas temperature and waste water after treatment is roughly the same, is 48 ℃, steam humidity 0.078156kg water/kg dry gas, and dehumidification rate reaches 63%; Ammonia outlet concentration is 276mg/m
3, absorption efficiency 90.14%; Nitrogen oxide exit concentration 357mg/m
3, absorption efficiency 51.76%.
Nitrophosphate fertilizer tail gas is handled: the pending amount 300m of process tail gas
3/ h, 60 ℃ of temperature, moisture content 19.95%, ammonia concentration 7000mg/m
3, nitrous oxides concentration 550mg/m
3Absorption liquid is rare nitric acid, and concentration is 20%, 30 ℃ of temperature, gas liquid ratio 3000m
3/ m
3, the rotary packed bed and filler of its main equipment is resistant material 00Cr19Ni11, the gas-liquid way of contact is cross-flow.
Open rotary packed bedly, rotational speed regulation is to 2500r/min.After running was stable, nitrophosphate fertilizer tail gas was introduced through blower fan and is rotary packed bedly contacted with absorption liquid, and liquid measure transfers to 0.1m gradually
3/ h finishes absorption process.Nitrophosphate fertilizer tail gas is by the gas outlet emptying, and absorption liquid is recycling.The nitrophosphate fertilizer tail gas temperature is 54 ℃ after treatment, 52 ℃ of absorption liquids.Tail gas humidity 0.1098kg water/kg dry gas, ammonia concentration 214mg/m
3, nitrogen oxide 195.3mg/m
3Efficient is respectively 29.03%, 96.94%, 64.5%.
Nitrophosphate fertilizer tail gas is handled: pending amount 150m
3/ h, 60 ℃ of temperature, moisture content 15%, ammonia concentration 700mg/m
3, nitrogen oxide 650mg/m
3Employing water is absorption liquid, 5 ℃ of temperature, gas liquid ratio 600m
3/ m
3, the rotary packed bed and filler of its main equipment is resistant material 1Cr18Ni9Ti, the gas-liquid way of contact is cross-flow.
This technology solves steam in the phosphate fertilizer tail gas, ammonia, nitrogen oxide problem simultaneously.After the rotary packed bed unlatching, regulate rotating speed to 1500r/min through frequency converter, treat that running is stable after, phosphate fertilizer tail gas is introduced in the packed bed via blower fan, and water is squeezed into rotary packed bed via liquid pump, after gas-liquid contacts in bed, the direct emptying of phosphate fertilizer tail gas, absorption liquid is recycled.
Liquid measure transfers to 0.25m
3/ h, the tail gas qualified discharge, wherein " white cigarette " phenomenon, 42 ℃ of exhaust temperatures, 39 ℃ in water, steam humidity 0.0545kg water/kg dry gas, ammonia concentration 278mg/m can not appear in steam
3, nitrogen oxide 285mg/m
3
Embodiment 4
Certain composite fertilizer factory nitrophosphate fertilizer tail gas is handled: PROCESS FOR TREATMENT amount 300m
3/ h, 80 ℃ of gas temperatures, ammonia concentration 4000mg/m
3, nitrogen oxide 600mg/m
3Absorption liquid is rare nitric acid, and concentration is 30%, and temperature is 30 ℃, gas liquid ratio 50m
3/ m
3, liquid measure increases to 6m
3/ h, the rotary packed bed and filler of its main equipment is resistant material 1Cr18Ni9Ti, the gas-liquid way of contact is cross-flow.
The problem of steam, ammonia, nitrogen oxide can be resolved simultaneously in this technology.After the rotary packed bed unlatching, rotating speed transfers to 1000r/min gradually, after running is stable, phosphate fertilizer tail gas enters rotary packed bed through air-introduced machine, absorption liquid enters packed bed by liquid pump, and gas-liquid contacts in bed, the emptying of phosphate fertilizer tail gas, absorption liquid is recycled, and system is stable.
Liquid measure transfers to 6m gradually
3/ h, 52 ℃ of discharging phosphate fertilizer exhaust temperatures, 48 ℃ in water, steam humidity 0.098kg water/kg dry gas, content 11%, dehumidification rate 52.6%, ammonia absorption efficiency 93.75%, exit concentration 251mg/m
3, nitrogen oxide exit concentration 265mg/m
3, efficient reaches 55.83%.
Certain nitrophosphate fertilizer tail gas is handled: PROCESS FOR TREATMENT amount 1500m
3/ h, 35 ℃ of gas temperatures, ammonia concentration 800mg/m
3, nitrogen oxide 300mg/m
3Absorption liquid is rare nitric acid, and concentration is 1%, and temperature is 5 ℃, gas liquid ratio 200m
3/ m
3, the rotary packed bed and filler of its main equipment is resistant material 0Cr18Ni9Ti, the gas-liquid way of contact is an adverse current, used rotary packed bed diameter 600mm, diffuser casing packing layer diameter 1000mm.
After the rotary packed bed unlatching, rotating speed transfers to 1200r/min gradually, after running is stable, nitrophosphate fertilizer tail gas enters rotary packed bed through air-introduced machine, absorption liquid enters packed bed by liquid pump, and gas-liquid contacts in bed, phosphate fertilizer tail gas qualified discharge, absorption liquid is recycled, and system is stable.The ammonia absorption efficiency reaches 90% in the discharging tail gas, and nitrogen oxide is removed efficient and can be reached more than 58%.
Certain vent gas treatment: PROCESS FOR TREATMENT amount 200m
3/ h, 55 ℃ of gas temperatures, ammonia concentration 1700mg/m
3, nitrogen oxide 420mg/m
3Absorption liquid is an acidic ammonium nitrate solution, and concentration is 1%, and the pH value is 6, and temperature is 10 ℃, gas liquid ratio 100m
3/ m
3, the rotary packed bed and filler of its main equipment is resistant material 0Cr18Ni9Ti, the gas-liquid way of contact is an adverse current.
After the rotary packed bed unlatching, rotating speed transfers to 2000r/min gradually, after running is stable, nitrophosphate fertilizer tail gas enters rotary packed bed through air-introduced machine, absorption liquid enters packed bed by liquid pump, and gas-liquid contacts in bed, phosphate fertilizer tail gas qualified discharge, absorption liquid is recycled, and system is stable.The ammonia absorption efficiency reaches 92% in the discharging tail gas, and nitrogen oxide is removed efficient and can be reached more than 60%.
Claims (7)
1, deaminizing denitrifying dehumidification technology in a kind of nitrophosphate fertilizer tail gas, two-layer packing layer is rotary packed bed about this process using, wherein lower floor is wet packing layer, the upper strata is the filler stem layer, this technology comprises following processing step: open rotary packed bed, regulate filler rotor speed at 150～2500r/min, introduce rotary packed bed by air inlet and inlet 35～80 ℃ the nitrogenous absorption liquid that contains wet nitrophosphate fertilizer tail gas and 5～30 ℃ of ammonia that contains respectively, contain that ammonia is nitrogenous to contain wet tail gas and the absorption liquid gas liquid ratio is 50～3000: 1, gas-liquid is at the deaminizing denitrifying of lower floor's packing layer contact carrying out gas, liquid after the contact is discharged by leakage fluid dram, the gas of finishing deaminizing denitrifying enters the upper strata packing layer subsequently and finishes dehumidifying, is discharged by exhaust outlet then.
2, deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas according to claim 1 is characterized in that the described gas-liquid way of contact is cross-flow or adverse current.
3, deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas according to claim 1 and 2 is characterized in that absorption liquid is water, rare nitric acid or acidic ammonium nitrate solution.
4, deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas according to claim 3 is characterized in that rare concentration of nitric acid is 0.1～20%.
5, deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas according to claim 3 is characterized in that the acidic ammonium nitrate solution concentration is 1～30%.
6, a kind of device of realizing as deaminizing denitrifying dehumidification technology in the nitrophosphate fertilizer tail gas as described in claim 1 or 2 or 4 or 5, it is characterized in that comprising rotary packed bed (2), rotary packed bed (2) inlet is connected with liquid circulation pump (8), rotary packed bed (2) liquid outlet links to each other with absorption liquid storage tank (3), absorption liquid storage tank (3) is connected with absorption liquid circulating slot (7) by circulating pump (4), absorption liquid circulating slot (7) is connected with liquid circulation pump (8), two-layer coaxial packing layer is set in described rotary packed bed (2), following packing layer (2-5) is wet filler, last packing layer (2-11) is a filler stem, and diffuser casing (2-10) is set between the two-layer packing layer.
7, deaminizing denitrifying dehumidification device in the nitrophosphate fertilizer tail gas according to claim 6 is characterized in that described rotary packed bed (2) employing resistant material, and the filler in the packing layer also adopts resistant material.
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| CNB2007101392912A CN100562354C (en) | 2007-08-24 | 2007-08-24 | Deaminizing denitrifying dehumidification technology and device in the nitrophosphate fertilizer tail gas |
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|---|---|---|---|
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| CN102019137B (en) * | 2010-12-01 | 2013-02-06 | 中北大学 | Method and device for removing low-concentration sulfur dioxide in flue gas |
| CN103446865A (en) * | 2013-07-03 | 2013-12-18 | 四川大学 | Nitrophosphate tail gas deamination device and nitrophosphate tail gas deamination process |
| CN103638775A (en) * | 2013-12-09 | 2014-03-19 | 深圳市芭田生态工程股份有限公司 | Treatment method of water vapor containing fluoride ammonia |
| CN109485461A (en) * | 2018-10-17 | 2019-03-19 | 贵州芭田生态工程有限公司 | Phosphorus ore acid hydrolysis waste gas absorption and utilization method neutralize mother liquor and phosphate fertilizer preparation method |
| CN110523178B (en) * | 2019-09-16 | 2020-12-04 | 固安县朔程燃气有限公司 | Smoke pollution purifier based on hypergravity |
| CN111282406A (en) * | 2020-02-26 | 2020-06-16 | 天津华创瑞风空调设备有限公司 | Solution dehumidifying device |
| CN112742189A (en) * | 2021-01-11 | 2021-05-04 | 瓮福（集团）有限责任公司 | Wet process purifies H in phosphoric acid device desorption flue gas2Ultralow emission process of S |
| CN113041788A (en) * | 2021-03-04 | 2021-06-29 | 中国科学院过程工程研究所 | Method for separating ammonia-containing gas by supergravity enhanced ionic liquid absorption |
| CN113371823B (en) * | 2021-07-29 | 2022-12-23 | 中原环保股份有限公司 | Continuous operation device for limited denitrification of municipal sewage and denitrification method thereof |
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Correction item: Inventor Correct: Liu Youzhi|Jiao Weizhou|Qi Guisheng|Meng Xiaoli False: Liu Youzhi|Jiao Weizhou|Qi Guisheng|Meng Xiaoli Number: 47 Volume: 25 |
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Granted publication date: 20091125 Termination date: 20190824 |