CN202962226U - Melamine tail gas recycling system - Google Patents

Melamine tail gas recycling system Download PDF

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Publication number
CN202962226U
CN202962226U CN2012206407018U CN201220640701U CN202962226U CN 202962226 U CN202962226 U CN 202962226U CN 2012206407018 U CN2012206407018 U CN 2012206407018U CN 201220640701 U CN201220640701 U CN 201220640701U CN 202962226 U CN202962226 U CN 202962226U
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China
Prior art keywords
tail gas
pipeline
solution
ammonia
absorber
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Expired - Lifetime
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CN2012206407018U
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Chinese (zh)
Inventor
汤广斌
甘世杰
刘灏
马东学
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HENAN JUNHUA DEVELOPMENT Co Ltd
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HENAN JUNHUA DEVELOPMENT Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The utility model provides a melamine tail gas recycling system which is used for solving the problems that the melamine tail gas recycling in the prior art are low in by-product additional value, poor in economic benefits and severe in environmental pollution. The recycling system comprises a tail gas absorbing device, a CO2 separating device, a tail gas analyzing device and a liquid ammonia extracting device, wherein the tail gas absorbing device is used for absorbing NH3 and CO2 in the melamine tail gas; the CO2 separating device is connected with the tail gas absorbing device by virtue of a pipeline, and used for separating CO2 gas in a solution flowing out from the tail gas absorbing device; the tail gas analyzing device is connected with the CO2 separating device and the tail gas absorbing device by virtue of pipelines respectively, and used for analyzing out NH3 gas in a solution flowing out from the CO2 separating device and feeding the exhausted effluent to the tail gas absorbing device; and the liquid ammonia extracting device is connected with the tail gas analyzing device by virtue of a pipeline, and used for changing the analyzed NH3 gas into liquid ammonia. By adopting the technical scheme of the utility model, the melamine tail gas recycling system is conductive to improving the economic benefits and greatly reducing the production energy consumption and the harm to the environment.

Description

The melamine tail gas recovery system
Technical field
The utility model relates to chemical production field, relates in particular to a kind of melamine tail gas recovery system.
Background technology
At present, part melamine producer adopts the melamine tail gas co-producing ammonium bicarbonate usually for saving the resources of production, its production method is: melamine tail gas is absorbed tower or the Jet absorber absorption is isolated product carbonic hydroammonium by crystallizer, centrifuge, and Recycling Mother Solution is used.Although this method for recovering tail gas reduces the wasting of resources of knowing clearly to a certain extent, have that the byproduct added value is low, careful problem of poor benefits, the more important thing is, in the process of co-producing ammonium bicarbonate, containing the ammonia waste liquid must regularly efflux, severe contamination environment.
Also have part melamine producer to adopt the melamine tail gas coproduction of ammonia sulfate.This method for recovering tail gas also reduces the wasting of resources of knowing clearly to a certain extent, but carbon dioxide can not fully reclaim, and emptying causes the wasting of resources, and has waste water to efflux to cause environmental pollution.
Therefore, in the prior art, the recovery of melamine tail gas is existed the byproduct added value is low, the problem of careful of poor benefits and serious environment pollution, for this problem, not yet propose at present effective solution.
Summary of the invention
Main purpose of the present utility model is to provide a kind of melamine tail gas recovery system, has to solve in prior art recovery to melamine tail gas that the byproduct added value is low, the problem of careful of poor benefits and serious environment pollution.
To achieve these goals, the utility model provides a kind of melamine tail gas recovery system.
Melamine tail gas recovery system of the present utility model comprises: the tail gas absorption equipment, and for the NH that absorbs melamine tail gas 3And CO 2CO 2Separation equipment is connected with the tail gas absorption equipment by pipeline, for separating of the CO that goes out in tail gas absorption equipment outflow solution 2Gas; The tail gas analyzing device, by pipeline respectively with CO 2Separation equipment is connected with the tail gas absorption equipment, is used for parsing CO 2Separation equipment flows out the NH in solution 3Gas, and the waste liquid of discharging is sent into the tail gas absorption equipment; The liquefied ammonia extraction equipment is connected with the tail gas analyzing device by pipeline, is used for the NH that parses 3Gas liquefy ammonia.
Further, the tail gas absorption equipment comprises: tail gas absorber, and for the NH that absorbs melamine tail gas 3And CO 2The tail gas absorption pump is connected with the top inlet with the bottom liquid outlet of tail gas absorber respectively by pipeline, is used for sending the solution in tail gas absorber, and a certain amount of solution is delivered to the top inlet of tail gas absorber as circulation solution; Ammonia vessel is connected with the tail gas absorption pump by pipeline, be used for to receive solution that the tail gas absorption pump sends and removes surplus solution outside circulation solution.
Further, the tail gas absorption equipment also comprises: tail gas absorber, be connected with the tail gas outlet of tail gas absorber by pipeline, and be used for absorbing the NH of the melamine tail gas after processing through tail gas absorber 3And CO 2The absorption tower circulating pump is connected respectively with top with the bottom of tail gas absorber by pipeline, is used for sending into the solution bleed to tail gas absorber; Absorber cooler is arranged on tail gas absorber and pipeline that the absorption tower circulating pump is connected, is used for cooling solution bleed; Pipeline between absorption tower circulating pump and absorber cooler also with the top inlet of tail gas absorption pump and tail gas absorber between pipeline be connected.
Further, CO 2Separation equipment comprises: CO 2Knockout tower is connected with the tail gas absorption equipment by pipeline, for separating of the CO that goes out in tail gas absorption equipment outflow solution 2Gas; The knockout tower feed pump is by pipeline and CO 2Knockout tower is connected, and is used for to CO 2Knockout tower provides the solution bleed; Resolve water filter, be arranged on CO 2On pipeline between knockout tower and knockout tower feed pump, be used for the solution bleed that isolated by filtration tower feed pump provides; The knockout tower reboiler is with CO 2Knockout tower is connected, and is used for heating CO 2Solution in knockout tower.
Further, the tail gas analyzing device comprises: Analytic Tower, by pipeline respectively with CO 2Separation equipment is connected with the tail gas absorption equipment, is used for air lift and goes out CO 2Separation equipment flows out the NH in solution 3Gas and CO 2Gas, and the waste liquid of discharging is sent into the tail gas absorption equipment; The resolution gas absorber is connected with Analytic Tower by pipeline, for the CO of the gas that absorbs Analytic Tower 2Gas; The ammonia rectifying column, its bottom is connected with the resolution gas absorber by pipeline, is used for gas scrubbing, drying to going out the resolution gas absorber, discharges NH 3Gas.
Further, the liquefied ammonia extraction equipment comprises: the ammonia knockout drum is connected with the ammonia rectifying column by pipeline, for separating of the NH that goes out the ammonia rectifying column and emit 3Gas; Ammonia compressor is connected with the ammonia knockout drum by pipeline; Ammonia condenser is connected with ammonia compressor by pipeline, is used for NH 3Gas is transformed into liquid ammonia under the effect of ammonia compressor.
Further, recovery system also comprises: first ammonium dashpot, and by pipeline and tail gas absorption equipment and CO 2Separation equipment is connected, and is used for the solution that storage is flowed out from the tail gas absorption equipment, CO 2Separation equipment is isolated the CO in the solution of first ammonium dashpot storage 2Gas.
According to the technical solution of the utility model, by tail gas absorption equipment, CO are set 2Separation equipment, tail gas analyzing device and liquefied ammonia extraction equipment make the NH in melamine tail gas 3And CO 2Realize separating fully, can obtain purity and be 99.5% liquefied ammonia product and purity and reach 98.5% CO 2, whole process waste liquid recycles, and effluxes without waste water, makes NH 3And CO 2Be fully used, improved economic benefit, reduced the pollution to environment.
Description of drawings
Figure of description is used to provide further understanding of the present utility model, consists of the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation block diagram according to the melamine tail gas recovery system of the utility model embodiment; And
Fig. 2 is the entity connection layout of Fig. 1.
The specific embodiment
Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
Fig. 1 is the structural representation block diagram according to the melamine tail gas recovery system 100 of the utility model embodiment.
As shown in Figure 1, melamine tail gas recovery system 100 of the present utility model comprises:
Tail gas absorption equipment 101 is for the NH3 and the CO2 that absorb melamine tail gas.
CO2 separation equipment 103 is connected with tail gas absorption equipment 101 by pipeline, for separating of the CO2 gas that goes out in tail gas absorption equipment 101 outflow solution.
Tail gas analyzing device 105 is connected with tail gas absorption equipment 101 with CO2 separation equipment 103 respectively by pipeline, is used for parsing the NH3 gas that CO2 separation equipment 103 flows out solution, and the waste liquid of discharging is sent into tail gas absorption equipment 101.Waste liquid recycling not only saved the resources of production but also avoided pollution to environment.
Liquefied ammonia extraction equipment 107 is connected with tail gas analyzing device 105 by pipeline, is used for the NH3 gas liquefy ammonia that parses.
Fig. 2 is the entity connection layout of Fig. 1.
As shown in Figure 2, in this entity connection layout, comprise successively from left to right:
Tail gas absorber 1 is for the NH3 and the CO2 that absorb melamine tail gas.
Tail gas absorption pump 2 is connected with the top inlet with the bottom liquid outlet of tail gas absorber 1 respectively by pipeline, is used for sending the solution in tail gas absorber, and a certain amount of solution is delivered to the top inlet of tail gas absorber 1 as circulation solution.
Ammonia vessel 3 is connected with tail gas absorption pump 2 by pipeline, be used for to receive solution that tail gas absorption pump 2 sends and removes surplus solution outside circulation solution.
Tail gas absorber 4 is connected with the tail gas outlet of tail gas absorber 1 by pipeline, is used for absorbing NH3 and the CO2 of the melamine tail gas after processing through tail gas absorber 1.
Absorption tower circulating pump 5 is connected respectively with top with the bottom of tail gas absorber 4 by pipeline, is used for sending into the solution bleed to tail gas absorber 4.
Absorber cooler 6 is arranged on tail gas absorber 4 and pipeline that absorption tower circulating pump 5 is connected, is used for cooling solution bleed.
Pipeline between absorption tower circulating pump 5 and absorber cooler 6 also with the top inlet of tail gas absorption pump 2 and tail gas absorber 1 between pipeline be connected.
The common tail gas absorption equipment 101 that forms of above-mentioned tail gas absorber 1, tail gas absorption pump 2, ammonia vessel 3, tail gas absorber 4, absorption tower circulating pump 5 and absorber cooler 6.
First ammonium booster 7 and first ammonium dashpot 8, first ammonium booster 7 is connected by the bottom of pipeline with ammonia vessel 3, first ammonium dashpot 8 is connected with first ammonium booster 7 by pipeline, and the solution in ammonia vessel 3 is pumped to first ammonium dashpot 8 under the effect of first ammonium booster 7.
First ammonium pump 9, by pipeline with first ammonium dashpot 8 to being connected.
CO2 knockout tower 12 is connected with first ammonium pump 9 by pipeline.
Knockout tower reboiler 11 is connected with CO2 knockout tower 12, is used for the solution in heating CO2 knockout tower 12.
Knockout tower feed pump 22 is connected with CO2 knockout tower 12 by pipeline, and being used for provides the solution bleed to the CO2 knockout tower.
Resolve water filter 13, be arranged on the pipeline between CO2 knockout tower 12 and knockout tower feed pump 22, be used for the solution bleed that isolated by filtration tower feed pump 22 provides.
Knockout tower is connected with the top of described CO2 knockout tower 12 to water cooler 14, and being used for provides the solution bleed to the epimere of CO2 knockout tower 12.
Above-mentioned knockout tower reboiler 11, CO2 knockout tower 12, parsing water filter 13, knockout tower are to water cooler 14 and the common CO2 separation equipment 103 that forms of knockout tower feed pump 22.
Analytic Tower 19 is connected with the top of CO2 knockout tower 12 with tail gas absorber 4 respectively by pipeline.
Analytic Tower reboiler 20 is connected with described Analytic Tower 19, is used for the solution in heating Analytic Tower 19.
Analytic Tower heat exchanger 21 is arranged on the pipeline that is connected between Analytic Tower 19 and CO2 knockout tower 12.
The absorption tower is to water cooler 10, be arranged on Analytic Tower 19 and pipeline that the top of tail gas absorber 4 is connected, be used for the waste liquid that cooling Analytic Tower 19 is discharged, cooled waste liquid is as the recirculated water of tail gas absorber 4, not only saved the resources of production but also avoided pollution to environment.
The first resolution gas absorber 16, the second resolution gas absorber 17 and the 3rd resolution gas absorber 18 are connected in series the common resolution gas absorber group that forms successively.
Wherein, the 3rd resolution gas absorber 18 is connected with the tail gas outlet of Analytic Tower 19 by pipeline, and the 3rd resolution gas absorber 18 also is connected with first ammonium pump 9 by pipeline.
Ammonia rectifying column 15, its bottom is connected with the first resolution gas absorber 16 by pipeline, is used for gas scrubbing, drying to going out resolution gas absorber 16, discharges NH3 gas.
Above-mentioned absorption tower is to the common tail gas analyzing device 105 that forms of water cooler 10, ammonia rectifying column 15, the first resolution gas absorber 16, the second resolution gas absorber 17, the 3rd resolution gas absorber 18, Analytic Tower 19, Analytic Tower reboiler 20 and Analytic Tower heat exchanger 21.
Ammonia knockout drum 23 is connected with ammonia rectifying column 15 by pipeline, for separating of the NH3 gas that goes out ammonia rectifying column 15 and emit.
Ammonia compressor 24 is connected with ammonia knockout drum 23 by pipeline.
Ammonia condenser 25 is connected with ammonia compressor 24 by pipeline, is used for NH3 gas is transformed into liquid ammonia under the effect of ammonia compressor 24.
Liquefied ammonia dashpot 26 is connected with ammonia condenser 25 by pipeline, is used for depositing liquid ammonia.
The common liquefied ammonia extraction equipment 107 that forms of above-mentioned ammonia knockout drum 23, ammonia compressor 24, ammonia condenser 25 and liquefied ammonia dashpot 26.
In the present embodiment, contain in melamine tail gas and be about 47.5%～49.5% NH3, also contain 50%～51.5% CO2.Adopt melamine tail gas recovery system of the present utility model to make the NH3 in melamine tail gas realize separating fully with CO2, and can be fully used, whole process is discharged without waste water.
Introduce in detail the operation principle of melamine tail gas recovery system of the present utility model below with reference to Fig. 2.
As shown in Figure 2, melamine tail gas enters tail gas absorber 1, and in tail gas absorber 1, in tail gas, most NH3 and CO2 are injected into the circulation ammonium fluid absorption of tail gas absorber 1, and the heat of absorption is taken away by the cooling water of the shell side of the tail gas absorber 1 of flowing through; Gas-liquid mixture in tail gas absorber 1 separates at the segregation section of its lower end, and solution is sent through tail gas absorption pump 2, and wherein 80% solution is delivered to the top inlet of tail gas absorber 1 as circulation solution, and remaining solution is sent into ammonia vessel 3 through Liquid level adjusting valve.The gas that goes out the tail gas outlet of tail gas absorber 1 enters tail gas absorber 4, when flowing through filling batch in tail gas absorber 4, NH3 in gas and CO2 almost all are washed absorption, following three sections filling batch in tail gas absorber 4 are made absorbent with the circulation weak aqua ammonia of absorption tower circulating pump 5, before entering tower, the circulation weak aqua ammonia is cooled to 40 ℃ in absorber cooler 6; Epimere filler in tail gas absorber 4 is made absorbent by the absorption tower to the solution bleed of water cooler 10; Go out the weak aqua ammonia of absorption tower circulating pump 5,80% enters tail gas absorber 1 as absorbent through being recycled into tail gas absorber 4,20%.
First ammonium dashpot 8 is accepted solution that ammonia vessel 3 sends here through first ammonium booster 7 and simultaneously from the solution of the 3rd resolution gas absorber 18, after mixing, these two kinds of solution enter first ammonium pump 9, this mixed solution consists of: NH323.4%, CO223.5%, H2O53.1%, this mixed solution is sent to Analytic Tower heat exchanger 21, Analytic Tower heat exchanger 21 is comprised of the tubular heat exchanger of two series connection, in this first ammonium pump 9 mixed solution of sending here and the solution bleed heat exchange that goes out Analytic Tower 19, mixed solution rises to the CO2 knockout tower 12 that enters 1.9MPa after 132 ℃.Be provided with three sections filling batch in CO2 knockout tower 12, epimere adds knockout tower to the solution bleed of water cooler 14,40 ℃ ~ 45 ℃ of water temperatures; The solution bleed that the stage casing adds knockout tower feed pump 22 to send here through resolving water filter 13, water temperature is 106 ℃; Hypomere adds the first ammonium liquid through Analytic Tower heat exchanger 21; Solution in CO2 knockout tower 12 are heated to 155 ℃ by knockout tower reboiler 11, contain 98.5% CO2 and the gas of moisture and are sent to urea plant from tower top.
The solution that goes out CO2 knockout tower 12 enters the Analytic Tower 19 of 0.66MPa, be provided with four sections filling batch in Analytic Tower 19, the top of first paragraph adds first ammonium liquid that first ammonium pump 9 sends here as phegma, at 120 ℃ ~ 128 ℃, Analytic Tower reboiler 20 is heated to 160 ℃ with solution in tower with control tower top air outlet temperature; The solution bleed that goes out Analytic Tower 19 is cooled to 106 ℃ through Analytic Tower heat exchanger 21, wherein 60% solution bleed enters CO2 knockout tower 12 through knockout tower feed pump 22, other solution bleed of 40% enters tail gas absorber 4 through the absorption tower to water cooler 10 and recycles, and has not only saved the resources of production but also has avoided pollution to environment.
The resolution gas that goes out Analytic Tower 19 passes through the 3rd resolution gas absorber 18, the second resolution gas absorber 17, the first resolution gas absorber 16 of three series connection successively, then advance ammonia rectifying column 15, at the hypomere of ammonia rectifying column 15 with 75% ammonia scrubbing, epimere is dry with backflow ammonia, uses that in the gas of ammonia rectifying column 15, water content drops to below 0.4%; In addition, the ammoniacal liquor that is absorbed with a small amount of CO2 advances the first resolution gas absorber 16, the second resolution gas absorber 17 and the 3rd resolution gas absorber 18 successively as absorbent, solution after absorption advances first ammonium dashpot 8 by the first resolution gas absorber 16, the second resolution gas absorber 17 and the 3rd resolution gas absorber 18, advance again CO2 knockout tower 12, to accomplish the abundant separation to CO2 gas in tail gas.
The gas pressure that goes out ammonia rectifying column 15 is 0.6MPa, temperature is controlled at 9 ℃, separate through ammonia knockout drum 23 and enter ammonia compressor 24 and be pressurized to 1.6MPa and enter ammonia condenser 25, be cooled to 40 ℃ of following liquefy ammonia through ammonia condenser 25 and enter liquefied ammonia dashpot 26, thereby obtain purity and be 99.5% liquefied ammonia product, improved the byproduct added value.
In sum, melamine tail gas recovery system of the present utility model, by tail gas absorption equipment 101, CO2 separation equipment 103, tail gas analyzing device 105 and liquefied ammonia extraction equipment 107 are set, make NH3 and CO2 in melamine tail gas realize separating fully, can obtain purity and be 99.5% liquefied ammonia product and purity and reach 98.5% CO2, whole process waste liquid recycles, efflux without waste water, NH3 and CO2 are fully used, have improved economic benefit, reduced the pollution to environment.
The above is only preferred embodiment of the present utility model, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (7)

1. a melamine tail gas recovery system, is characterized in that, comprising:
The tail gas absorption equipment is for the NH that absorbs melamine tail gas 3And CO 2
CO 2Separation equipment is connected with described tail gas absorption equipment by pipeline, for separating of the CO that goes out in described tail gas absorption equipment outflow solution 2Gas;
The tail gas analyzing device, by pipeline respectively with described CO 2Separation equipment is connected with described tail gas absorption equipment, is used for parsing described CO 2Separation equipment flows out the NH in solution 3Gas, and the waste liquid of discharging is sent into described tail gas absorption equipment;
The liquefied ammonia extraction equipment is connected with described tail gas analyzing device by pipeline, is used for the described NH that will parse 3Gas liquefy ammonia.
2. recovery system according to claim 1, is characterized in that, described tail gas absorption equipment comprises:
Tail gas absorber is for the NH that absorbs melamine tail gas 3And CO 2
The tail gas absorption pump, be connected with the top inlet with the bottom liquid outlet of described tail gas absorber respectively by pipeline, be used for sending the solution in described tail gas absorber, and a certain amount of described solution delivered to the top inlet of described tail gas absorber as circulation solution;
Ammonia vessel is connected with described tail gas absorption pump by pipeline, is used for receiving described solution that described tail gas absorption pump sends and removes surplus solution outside described circulation solution.
3. recovery system according to claim 2, is characterized in that, described tail gas absorption equipment also comprises:
Tail gas absorber is connected with the tail gas outlet of described tail gas absorber by pipeline, is used for absorbing the NH of the melamine tail gas after processing through tail gas absorber 3And CO 2
The absorption tower circulating pump is connected respectively with top with the bottom of described tail gas absorber by pipeline, is used for sending into the solution bleed to described tail gas absorber;
Absorber cooler is arranged on described tail gas absorber and pipeline that described absorption tower circulating pump is connected, is used for cooling described solution bleed;
Pipeline between described absorption tower circulating pump and described absorber cooler also with the top inlet of described tail gas absorption pump and described tail gas absorber between pipeline be connected.
4. recovery system according to claim 1, is characterized in that, described CO 2Separation equipment comprises:
CO 2Knockout tower is connected with described tail gas absorption equipment by pipeline, for separating of the CO that goes out in described tail gas absorption equipment outflow solution 2Gas;
The knockout tower feed pump is by pipeline and described CO 2Knockout tower is connected, and is used for to described CO 2Knockout tower provides the solution bleed;
Resolve water filter, be arranged on described CO 2On pipeline between knockout tower and described knockout tower feed pump, be used for filtering the solution bleed that described knockout tower feed pump provides;
The knockout tower reboiler is with described CO 2Knockout tower is connected, and is used for heating described CO 2Solution in knockout tower.
5. recovery system according to claim 1, is characterized in that, described tail gas analyzing device comprises:
Analytic Tower, by pipeline respectively with described CO 2Separation equipment is connected with described tail gas absorption equipment, is used for air lift and goes out described CO 2Separation equipment flows out the NH in solution 3Gas and CO 2Gas, and the waste liquid of discharging is sent into described tail gas absorption equipment;
The resolution gas absorber is connected with described Analytic Tower by pipeline, for the CO of the gas that absorbs described Analytic Tower 2Gas;
The ammonia rectifying column, its bottom is connected with described resolution gas absorber by pipeline, is used for gas scrubbing, drying to going out described resolution gas absorber, discharges NH 3Gas.
6. recovery system according to claim 1, is characterized in that, described liquefied ammonia extraction equipment comprises:
The ammonia knockout drum is connected with described ammonia rectifying column by pipeline, for separating of the NH that goes out described ammonia rectifying column and emit 3Gas;
Ammonia compressor is connected with described ammonia knockout drum by pipeline;
Ammonia condenser is connected with described ammonia compressor by pipeline, is used for described NH 3Gas is transformed into liquid ammonia under the effect of described ammonia compressor.
7. the described recovery system of any one according to claim 1 to 6, is characterized in that, described recovery system also comprises:
First ammonium dashpot is by pipeline and described tail gas absorption equipment and described CO 2Separation equipment is connected, and is used for the solution that storage is flowed out from described tail gas absorption equipment, described CO 2Separation equipment is isolated the CO in the described solution of described first ammonium dashpot storage 2Gas.
CN2012206407018U 2012-11-28 2012-11-28 Melamine tail gas recycling system Expired - Lifetime CN202962226U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104748507A (en) * 2015-03-03 2015-07-01 厦门市格绿科技有限公司 Treatment system for recovering chemical plant waste gas containing ammonia into liquid ammonia and treatment method thereof
CN105645436A (en) * 2016-03-18 2016-06-08 安徽省化工设计院 Novel system for recycling ammonia from waste gas produced by benzene and cyanogen device
CN113582201A (en) * 2021-08-20 2021-11-02 四川金象赛瑞化工股份有限公司 Process for recycling tail gas of cyanamide process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104748507A (en) * 2015-03-03 2015-07-01 厦门市格绿科技有限公司 Treatment system for recovering chemical plant waste gas containing ammonia into liquid ammonia and treatment method thereof
CN105645436A (en) * 2016-03-18 2016-06-08 安徽省化工设计院 Novel system for recycling ammonia from waste gas produced by benzene and cyanogen device
CN113582201A (en) * 2021-08-20 2021-11-02 四川金象赛瑞化工股份有限公司 Process for recycling tail gas of cyanamide process

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