CN105413406B - The recovery system and its operating method of gas ammonia in a kind of emptying end gas - Google Patents
The recovery system and its operating method of gas ammonia in a kind of emptying end gas Download PDFInfo
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- CN105413406B CN105413406B CN201510987149.8A CN201510987149A CN105413406B CN 105413406 B CN105413406 B CN 105413406B CN 201510987149 A CN201510987149 A CN 201510987149A CN 105413406 B CN105413406 B CN 105413406B
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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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/022—Preparation of aqueous ammonia solutions, i.e. ammonia water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to the recovery system and its operating method of gas ammonia in a kind of emptying end gas, present system includes gas ammonia absorption tower, weak aqua ammonia groove, weak aqua ammonia pump, decomposition of effluent groove, decomposition of effluent pump, vacuum jet pump, First Heat Exchanger, the second heat exchanger；It is of the invention flexibly to use the decomposition of effluent in production system and the heat-exchanger rig in gas ammonia absorption tower, the gas ammonia in emptying end gas is inversely contacted fully reaction generation product weak aqua ammonia with decomposition of effluent in gas ammonia absorption tower, used for chimney desulphurization system；Present system can be well control the technique required by production status, the gas ammonia in emptying end gas is set to have obtained sufficient recovery, reduce the discharge of Pollution Gas, obtained weak aqua ammonia is reclaimed simultaneously can be also used for chimney desulfurization, unique process pipelines design, the discharge of waste gas and waste liquid when reducing production system operation, good technical support is provided for environmental protection of enterprise production.
Description
Technical field
The present invention relates to tail gas clean-up and gas ammonia discharge field, and in particular to the recovery system of gas ammonia in a kind of emptying end gas
And its operating method.
Background technology
At present, China is used as global maximum developing country, its natural environment pollution, atmosphere pollution, solid waste
The environmental problems such as pollution have turned into the biggest problem that country nowadays faces.Gas ammonia in enterprise in the emission of production system
It is to influence larger gaseous contaminant in atmosphere pollution, has great damaging effect to human body, environment and the ecosystem, with
Environmental requirement it is increasingly strict, the discharge of gas ammonia is increasingly paid close attention to by people, therefore country is in emptying end gas and waste liquid
In ammonia nitrogen have strict regulation and limitation.Especially for substantial amounts of gas ammonia is contained in the emptying of carbamide production system tail gas, both
Environment is polluted, consumption is added again, increasingly strict due to environmental requirement, the emission problem of gas ammonia can not be obtained in such as tail gas
Solve, the existence of manufacturing enterprise will be faced with formidable challenges.
The content of the invention
The technical problem to be solved in the present invention is to provide the recovery system and its operating method of gas ammonia in a kind of tail gas, dress
Put that technological process is simple, operating cost is cheap, effectively reclaimed the gas ammonia in emptying end gas, reduced the pollution of environment, also
Product weak aqua ammonia can be obtained to use for chimney desulphurization system.
Following scheme is used for this present invention design：
The recovery system of gas ammonia in a kind of emptying end gas, including gas ammonia absorption tower, weak aqua ammonia groove, weak aqua ammonia pump, solution waste suction
Liquid bath, decomposition of effluent pump, vacuum jet pump, First Heat Exchanger, the second heat exchanger；The gaseous phase outlet and gas of second heat exchanger
The bottom of ammonia absorber is connected, and the gas phase import of the second heat exchanger is connected with exhaust pipe, and second heat exchanger and gas ammonia are inhaled
The bottom for receiving tower connects lower liquid pipe respectively, and the lower liquid pipe is deeply to the bottom of weak aqua ammonia groove, the vacuum of the vacuum jet pump
Suction inlet is connected with the gas phase mouth at the top of gas ammonia absorption tower, and the diffusion mouth of pipe of vacuum jet pump is connected with weak aqua ammonia groove upper end, institute
The outlet at bottom for stating weak aqua ammonia groove is connected with the import of weak aqua ammonia pump；
The outlet of the weak aqua ammonia pump is divided into three tunnels, is connected all the way by the 4th stop valve with vacuum jet pump, a-road-through
The spray equipment that the 3rd stop valve is crossed with gas ammonia absorption tower top is connected, and passes through the second regulating valve and chimney desulphurization system phase all the way
Even；The outlet of the decomposition of effluent trench bottom is connected with decomposition of effluent pump inlet；The outlet of the decomposition of effluent pump is divided into three tunnels,
It is connected, is filled all the way by the first stop valve and the spray on gas ammonia absorption tower top with vacuum jet pump by the second stop valve all the way
Connection is put, is connected all the way by the first regulating valve with Waste Water Treatment；The import of the decomposition of effluent groove and First Heat Exchanger
Outlet be connected, the import of the First Heat Exchanger is connected with decomposition of effluent pipe.
Further, the gas ammonia absorption tower is packed absorber, be sequentially provided with from top to bottom inside it the first spray equipment,
Second spray equipment, distributor and heat exchanging pipe；The outlet of the weak aqua ammonia pump passes through on the 3rd stop valve and gas ammonia absorption tower
The second spray equipment connection in portion, the outlet of the decomposition of effluent pump passes through the first stop valve and the first of gas ammonia absorption tower top
Spray equipment is connected.
Further, the weak aqua ammonia groove upper top is provided with the exhaust purifier for being used for reclaiming weak aqua ammonia groove volatilization gas ammonia, institute
The inlet for stating exhaust purifier is connected by the 5th stop valve with the outlet of weak aqua ammonia pump.
Further, it is equipped with import at the circulating water intake of the First Heat Exchanger, the second heat exchanger and heat exchanging pipe
Water control valve.
The operating method of the recovery system of gas ammonia, comprises the following steps in a kind of emptying end gas：
1）Urea decomposition of effluent is delivered to First Heat Exchanger by decomposition of effluent pipe, delivered to after being cooled down through First Heat Exchanger
Decomposition of effluent groove, starts decomposition of effluent pump, and decomposition of effluent delivers to Waste Water Treatment by the first regulating valve, passes through the first regulation
Decomposition of effluent liquid level in valve control decomposition of effluent groove；
2）Emptying end gas is cooled by the second heat exchanger and reaches temperature needed for production technology, is sprayed by vacuum
Penetrate pump to suck the tail gas after cooling from the bottom on gas ammonia absorption tower, the pressure in gas ammonia absorption tower is controlled by the second stop valve
Power, and will can absorb the decomposition of effluent of gas ammonia in tail gas and be delivered to by the first stop valve first spray on gas ammonia absorption tower top
Shower device, is sprayed downwards in the presence of the first spray equipment, the decomposition of effluent counter current contacting after gas ammonia and cooling in tail gas
Generation gas-liquid two-phase reacts, and generates dilute ammonia solution, and dilute ammonia solution flows into weak aqua ammonia groove in the presence of potential difference；
3）When the liquid level in weak aqua ammonia groove reaches the 20%-30% of weak aqua ammonia groove volume, start weak aqua ammonia pump, pass through the 4th
Dilute ammonia solution in weak aqua ammonia groove is delivered to by stop valve to control the pressure in gas ammonia absorption tower by the 3rd stop valve
Second spray equipment on gas ammonia absorption tower top, weak aqua ammonia is sprayed downwards in the presence of the second spray equipment, and weak aqua ammonia passes through
Distributor is uniformly entered in heat exchanging pipe and cooled, and the decomposition of effluent with the penetrating of the first spray equipment is together with entering gas ammonia
Reverse absorbing reaction occurs for the gas ammonia in the tail gas in absorption tower, absorbs the weak aqua ammonia after gas ammonia and again flows into weak aqua ammonia groove；
4）After the liquid level in weak aqua ammonia groove reaches the 50%-70% of weak aqua ammonia groove volume, the first stop valve and second is closed
Stop valve stops injecting decomposition of effluent to gas ammonia absorption tower；Needed for the weak aqua ammonia concentration of weak aqua ammonia groove reaches chimney desulphurization system
Concentration when weak aqua ammonia is delivered to by chimney desulphurization system by the second regulating valve, when the liquid level in weak aqua ammonia groove is down to weak aqua ammonia
After the 10%-20% of groove volume, the first stop valve is again turned on to weak aqua ammonia groove fluid infusion；
5）Circulating repetition above-mentioned 1）—4）Step.
The beneficial effects of the present invention are：
It is of the invention flexibly to use the decomposition of effluent in production system and the heat-exchanger rig in gas ammonia absorption tower, absorbed in gas ammonia
The gas ammonia in emptying end gas is set inversely to contact fully reaction generation product weak aqua ammonia with decomposition of effluent in tower, for chimney desulphurization system
Use；Present system can be well control the technique required by production status, filled the gas ammonia in emptying end gas
The recovery divided, reduces the discharge of Pollution Gas, while reclaiming obtained weak aqua ammonia can be also used for chimney desulfurization, it is unique
Process pipelines design, reduce production system operation when waste gas and waste liquid discharge, for environmental protection of enterprise production provide well
Technical support.
Brief description of the drawings
Just the embodiment of the present invention is described further below in conjunction with the accompanying drawings, wherein：
Fig. 1 is the process equipment flow chart of the present invention.
Embodiment
The recovery system of gas ammonia in a kind of emptying end gas shown in reference picture 1, including gas ammonia absorption tower 2, weak aqua ammonia groove 6,
Weak aqua ammonia pump 11, decomposition of effluent groove 13, decomposition of effluent pump 12, vacuum jet pump 8, First Heat Exchanger 14, the second heat exchanger 1；Institute
The gaseous phase outlet for stating the second heat exchanger 1 is connected with the bottom on gas ammonia absorption tower 2, the gas phase import of the second heat exchanger 1 and offgas duct
Road is connected, and the bottom of the gentle ammonia absorber 2 of the second heat exchanger 1 connects lower liquid pipe 21 respectively, and the lower liquid pipe 21 is goed deep into extremely
The bottom of weak aqua ammonia groove 6, the vacuum inlet feeds of the vacuum jet pump 8 are connected with the gas phase mouth at the top of gas ammonia absorption tower 2, vacuum
The diffusion mouth of pipe of jet pump 8 is connected with the upper end of weak aqua ammonia groove 6, the outlet at bottom of the weak aqua ammonia groove 6 and entering for weak aqua ammonia pump 11
Mouth connection.
The outlet of the weak aqua ammonia pump 11 is divided into three tunnels, is connected all the way by the 4th stop valve 19 with vacuum jet pump 8, one
Road is connected by the 3rd stop valve 17 with second spray equipment 4 on the top of gas ammonia absorption tower 2, all the way by the second regulating valve 15 with
Chimney desulphurization system is connected.
The outlet of the bottom of decomposition of effluent groove 13 is connected with the import of decomposition of effluent pump 12；The decomposition of effluent pump 12 goes out
Mouth is divided into three tunnels, is connected all the way by the second stop valve 20 with vacuum jet pump 8, passes through the first stop valve 18 all the way and is inhaled with gas ammonia
The first spray equipment 3 for receiving the top of tower 2 is connected, and is connected all the way by the first regulating valve 16 with Waste Water Treatment.
The import of the decomposition of effluent groove 13 is connected with the outlet of First Heat Exchanger 14, the import of the First Heat Exchanger 14
It is connected with decomposition of effluent pipe.
The vacuum jet pump 8 is used to control the pressure in gas ammonia absorption tower 2, passes through the 4th stop valve 19 and the second cut-off
Valve 20 aspirates weak aqua ammonia and decomposition of effluent to weak aqua ammonia groove, sucks in gas ammonia absorption tower 2 tail gas in vacuum orifice and reacts, control
The pressure on whole gas ammonia absorption tower 2 is between -20kpa ~ -30kpa.
The gas ammonia absorption tower 2 is packed absorber, and the first spray equipment 3, second is sequentially provided with from top to bottom inside it
Spray equipment 4, distributor 7 and heat exchanging pipe 5；The circulation of the First Heat Exchanger 14, the second heat exchanger 1 and heat exchanging pipe 5
Import water control valve 23,9,10 is respectively equipped with water inlet, is controlled by the quantity of circulating water of the regulation of import water control valve 23,9,10
Reaction temperature in gas ammonia absorption tower 2 processed, makes the reaction temperature in gas ammonia absorption tower 2 control between 40-50 DEG C.
The upper top of weak aqua ammonia groove 6 is provided with exhaust purifier 21, and the inlet of the exhaust purifier 21 passes through the 5th
Stop valve 22 is connected with the outlet of weak aqua ammonia pump 11；Exhaust purifier 21 absorbs the gas ammonia of the volatilization made in weak aqua ammonia groove 6, and can
It is recycled to by weak aqua ammonia recoil in weak aqua ammonia groove 6.
The system operation methods of the present invention, comprise the following steps：
1）Urea decomposition of effluent is delivered to First Heat Exchanger 14 by decomposition of effluent pipe, after being cooled down through First Heat Exchanger 14
Decomposition of effluent groove 13 is delivered to, starts decomposition of effluent pump 12, decomposition of effluent delivers to Waste Water Treatment by the first regulating valve 16, is led to
The decomposition of effluent liquid level crossed in the first regulating valve 16 control decomposition of effluent groove 13.
2）Emptying end gas is cooled by the second heat exchanger 1 and reaches temperature needed for production technology, is sprayed by vacuum
Penetrate pump 8 to suck the tail gas after cooling from the bottom on gas ammonia absorption tower 2, controlled by the second stop valve 20 in gas ammonia absorption tower 2
Pressure, and will can absorb the decomposition of effluent of gas ammonia in tail gas the top of gas ammonia absorption tower 2 is delivered to by the first stop valve 18
The first spray equipment 3, sprayed downwards in the presence of the first spray equipment 3, the solution waste suction after gas ammonia and cooling in tail gas
Gas-liquid two-phase reaction occurs for liquid counter current contacting, generates dilute ammonia solution, and dilute ammonia solution flows into weak aqua ammonia in the presence of potential difference
Groove 6.
3）When the liquid level in weak aqua ammonia groove 6 reaches the 20%-30% of the volume of weak aqua ammonia groove 6, start weak aqua ammonia pump 11, pass through
4th stop valve 19 controls the pressure in gas ammonia absorption tower 2, and by the 3rd stop valve 17 by the weak aqua ammonia in weak aqua ammonia groove
Solution is delivered to second spray equipment 4 on the top of gas ammonia absorption tower 2, and weak aqua ammonia sprays downwards in the presence of the second spray equipment 4
Drench, weak aqua ammonia is uniformly entered by distributor 7 and cooled in heat exchanging pipe 5, the solution waste suction sprayed into the first spray equipment 3
Liquid with entering the reverse absorbing reaction of gas ammonia generation in the tail gas in gas ammonia absorption tower 2, absorbs the weak aqua ammonia after gas ammonia again together
It is secondary to flow into weak aqua ammonia groove 6.
4）After the liquid level in weak aqua ammonia groove 6 reaches the 50%-70% of the volume of weak aqua ammonia groove 6, the He of the first stop valve 18 is closed
Second stop valve 20 stops injecting decomposition of effluent to gas ammonia absorption tower 2；When the weak aqua ammonia concentration of weak aqua ammonia groove 6 reaches chimney desulfurization
Weak aqua ammonia is delivered to by chimney desulphurization system by the second regulating valve 15 during concentration needed for system, the liquid in weak aqua ammonia groove 6
Potential drop is again turned on the first stop valve 18 to the fluid infusion of weak aqua ammonia groove 6 to after the 10%-20% of the volume of weak aqua ammonia groove 6.
5）Circulating repetition above-mentioned 1）—4）Step.
It is described above, it is only the present invention preferably embodiment, but the scope of the present invention is not limited thereto, it is any
Those familiar with the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in, and all should
It is included within the scope of the present invention.Therefore the scope of the present invention is defined by the protection domain of claims.
Claims (5)
1. the recovery system of gas ammonia in a kind of emptying end gas, it is characterised in that including gas ammonia absorption tower, weak aqua ammonia groove, weak aqua ammonia
Pump, decomposition of effluent groove, decomposition of effluent pump, vacuum jet pump, First Heat Exchanger, the second heat exchanger；The gas of second heat exchanger
Mutually outlet is connected with the bottom on gas ammonia absorption tower, and the gas phase import of the second heat exchanger is connected with exhaust pipe, second heat exchange
The bottom of the gentle ammonia absorber of device connects lower liquid pipe respectively, and the lower liquid pipe is deeply to the bottom of weak aqua ammonia groove, the vacuum spray
The vacuum inlet feeds for penetrating pump are connected with the gas phase mouth at the top of gas ammonia absorption tower, on the diffusion mouth of pipe and weak aqua ammonia groove of vacuum jet pump
End connection, the outlet at bottom of the weak aqua ammonia groove is connected with the import of weak aqua ammonia pump；
The outlet of the weak aqua ammonia pump is divided into three tunnels, is connected all the way by the 4th stop valve with vacuum jet pump, passes through all the way
Three stop valves are connected with the spray equipment on gas ammonia absorption tower top, are connected all the way by the second regulating valve with chimney desulphurization system；
The outlet of the decomposition of effluent trench bottom is connected with decomposition of effluent pump inlet；The outlet of the decomposition of effluent pump is divided into three tunnels, one
Road is connected by the second stop valve with vacuum jet pump, passes through the first stop valve and the spray equipment on gas ammonia absorption tower top all the way
Connection, is connected by the first regulating valve with Waste Water Treatment all the way；The import of the decomposition of effluent groove and First Heat Exchanger
Outlet is connected, and the import of the First Heat Exchanger is connected with decomposition of effluent pipe.
2. the recovery system of gas ammonia in a kind of emptying end gas according to claim 1, it is characterised in that the gas ammonia absorbs
Tower is packed absorber, is sequentially provided with the first spray equipment, the second spray equipment, distributor and heat exchange row inside it from top to bottom
Pipe；The outlet of the weak aqua ammonia pump is connected by the 3rd stop valve with second spray equipment on gas ammonia absorption tower top, the solution
The outlet of waste suction liquid pump is connected by the first stop valve with first spray equipment on gas ammonia absorption tower top.
3. the recovery system of gas ammonia in a kind of emptying end gas according to claim 1, it is characterised in that the weak aqua ammonia groove
Upper top is provided with the exhaust purifier for being used for reclaiming weak aqua ammonia groove volatilization gas ammonia, and the inlet of the exhaust purifier passes through the 5th
Stop valve is connected with the outlet of weak aqua ammonia pump.
4. the recovery system of gas ammonia in a kind of emptying end gas according to claim 2, it is characterised in that first heat exchange
Import water control valve is equipped with the circulating water intake of device, the second heat exchanger and heat exchanging pipe.
5. the operating method of the recovery system of gas ammonia in a kind of emptying end gas according to claim 2, it is characterised in that bag
Include following steps：
1）Urea decomposition of effluent is delivered to First Heat Exchanger by decomposition of effluent pipe, desorption is delivered to after being cooled down through First Heat Exchanger
Waste liquid tank, starts decomposition of effluent pump, and decomposition of effluent delivers to Waste Water Treatment by the first regulating valve, passes through the first regulating valve control
Decomposition of effluent liquid level in decomposition of effluent groove processed；
2）Emptying end gas is cooled by the second heat exchanger and reaches temperature needed for production technology, passing through vacuum jet pump will
Tail gas after cooling is sucked from the bottom on gas ammonia absorption tower, and the pressure in gas ammonia absorption tower is controlled by the second stop valve, and will
The decomposition of effluent that gas ammonia in tail gas can be absorbed is delivered to first spray equipment on gas ammonia absorption tower top by the first stop valve,
Sprayed downwards in the presence of the first spray equipment, gas-liquid occurs for the decomposition of effluent counter current contacting after the gas ammonia and cooling in tail gas
Two phase reaction, generates dilute ammonia solution, and dilute ammonia solution flows into weak aqua ammonia groove in the presence of potential difference；
3）When the liquid level in weak aqua ammonia groove reaches the 20%-30% of weak aqua ammonia groove volume, start weak aqua ammonia pump, pass through the 4th cut-off
Dilute ammonia solution in weak aqua ammonia groove is delivered to gas ammonia by valve to control the pressure in gas ammonia absorption tower by the 3rd stop valve
Second spray equipment on absorption tower top, weak aqua ammonia is sprayed downwards in the presence of the second spray equipment, and weak aqua ammonia is by distribution
Device is uniformly entered in heat exchanging pipe and cooled, and is absorbed together with entering gas ammonia with the decomposition of effluent that the first spray equipment is sprayed into
Reverse absorbing reaction occurs for the gas ammonia in the tail gas in tower, absorbs the weak aqua ammonia after gas ammonia and again flows into weak aqua ammonia groove；
4）After the liquid level in weak aqua ammonia groove reaches the 50%-70% of weak aqua ammonia groove volume, the first stop valve and the second cut-off are closed
Valve stops injecting decomposition of effluent to gas ammonia absorption tower；It is dense needed for the weak aqua ammonia concentration of weak aqua ammonia groove reaches chimney desulphurization system
Weak aqua ammonia is delivered to by chimney desulphurization system by the second regulating valve when spending, weak aqua ammonia groove is down to when the liquid level in weak aqua ammonia groove and holds
After long-pending 10%-20%, the first stop valve is again turned on to weak aqua ammonia groove fluid infusion；
5）Circulating repetition above-mentioned 1）—4）Step.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510987149.8A CN105413406B (en) | 2015-12-27 | 2015-12-27 | The recovery system and its operating method of gas ammonia in a kind of emptying end gas |
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| CN201510987149.8A CN105413406B (en) | 2015-12-27 | 2015-12-27 | The recovery system and its operating method of gas ammonia in a kind of emptying end gas |
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| CN105413406A CN105413406A (en) | 2016-03-23 |
| CN105413406B true CN105413406B (en) | 2017-10-24 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107555448B (en) * | 2017-08-23 | 2018-09-04 | 江苏安顺新材料科技有限公司 | The method that the tail gas generated using production glycine prepares high concentration ammonium hydroxide |
| CN109589753A (en) * | 2018-11-25 | 2019-04-09 | 鲁西化工集团股份有限公司 | A kind for the treatment of process of the ammonium fluid in urea absorption system |
| CN111214928B (en) * | 2018-11-26 | 2021-09-14 | 中国科学院大连化学物理研究所 | Factory waste gas treatment system containing ammonia gas |
| CN110026405B (en) * | 2019-04-04 | 2021-08-10 | 北京卫星制造厂有限公司 | Waste gas and waste liquid recovery equipment based on forming of heat-proof product of return airship |
| CN113144871A (en) * | 2020-01-22 | 2021-07-23 | 福建省坤宁环保工程有限公司 | Dust removal desulfurizing tower |
| CN111991994A (en) * | 2020-08-18 | 2020-11-27 | 江苏华昌化工股份有限公司 | Treatment method for volatilizing ammonia gas |
| CN112678845B (en) * | 2020-12-19 | 2022-11-01 | 宁波四明化工有限公司 | Ammonia water synthesis process |
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| CN105413406A (en) | 2016-03-23 |
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