CN207030977U - The retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system - Google Patents
The retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system Download PDFInfo
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- CN207030977U CN207030977U CN201720930239.8U CN201720930239U CN207030977U CN 207030977 U CN207030977 U CN 207030977U CN 201720930239 U CN201720930239 U CN 201720930239U CN 207030977 U CN207030977 U CN 207030977U
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Abstract
The utility model discloses the retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system, including ammonia convertor, one-level condensation separation tower, B-grade condensation knockout tower, ammonia flash tank, compressor, the flash steam outlet of the ammonia flash tank is connected with the entrance of flash steam scrubbing tower, the periodic off-gases extracted out before compressor compresses are connected by the pipeline provided with inlet adjustment valve with periodic off-gases scrubbing tower, the weak aqua ammonia outlet of the flash steam scrubbing tower is connected by the pipeline provided with pump with the weak aqua ammonia export pipeline of periodic off-gases scrubbing tower with the entrance of heat exchanger, the outlet of the heat exchanger is connected with the entrance of ammonia still, one hot water outlet of the ammonia still bottom of towe passes through pipeline and heat exchanger, water cooler is sequentially connected, the outlet of the water cooler cooling water is connected by pipeline with the tower top entrance of flash steam scrubbing tower and periodic off-gases scrubbing tower respectively.Can realize that synthetic cyclic gas continuously arranges lazy purpose by this device, and the useful constituent in periodic off-gases and flashed vapour is recycled, with solve synthesis gas continuously discharge periodic off-gases and flash steam and caused by economic loss and environmental pollution.
Description
Technical field
The utility model belongs to synthesis ammonia system technical field, and in particular to one kind be used for synthesis ammonia system in periodic off-gases and
The retracting device of flashed vapour.
Background technology
Synthesis ammonia refers to the ammonia directly synthesized under HTHP and catalyst action by nitrogen and hydrogen, and ammonia in the world is except few
Amount is reclaimed outside by-product from oven gas, the ammonia mostly synthesized, and in chemical plant, synthesis ammonia can provide original for subsequent production
Material, it is production chemical fertilizer and the main source of refrigerant and industrial chemicals, is played a crucial role in production and operation.
Synthesis gas generally use closed circulation, pure synthesis gas is obtained by liquid nitrogen washing and pressure-variable adsorption, through compressor pressure
Contracting is sent into synthetic tower, and ammonia is synthesized under HTHP and iron catalyst catalyst action, then cold by a series of cooling of heat exchangers
Coagulate for liquefied ammonia, and product is sent to each user or ammonia storehouse, due to being restricted by synthesis ammonia chemical balance, the one way synthesis of hydrogen and nitrogen gas
Rate is relatively low, and therefore, after product ammonia separation, unreacted gas need to return to synthetic tower and recycle.
My company's synthetic cyclic gas is formed from synthetic tower, one-level condensation separation, B-grade condensation separation, compression, synthetic tower
Closed circulation, a small amount of virgin gas during which is supplemented in synthetic compressor entrance, there are a small amount of periodic off-gases to discharge before compression, condensed in two stages
Gained liquefied ammonia discharges flashed vapour after flash distillation after separation, and because of closed circulation, inert gas must be contained in periodic off-gases and flashed vapour
（CH4、Ar、He）And useful constituent（Hydrogen, nitrogen, ammonia）.Inert gas derives from fresh feed gas, and it does not participate in reaction but can be
Being accumulated in system, in the presence of the partial pressure of hydrogen and nitrogen in gas is reduced, the chemical balance and reaction speed to synthetic reaction are unfavorable for it,
But maintain too low inert gas to need to discharge substantial amounts of circulating air again, cause the waste of unstripped gas.Periodic off-gases in this system
Must rationally be solved with flashed vapour, otherwise it can constantly be accumulated during synthetic cyclic gas closed circulation, and this, which not only increases, is
Drag effects of uniting production, also reducing active princlple influences product yield and quality.To periodic off-gases, flash distillation in system generally in production
The measure that gas is taken uses direct discharging modes originally, is controlled by manual control switch's valve, is if being easily caused when aperture is too small
System builds the pressure, and easily causes waste when aperture is big, and this causes system production operation extremely unstable, it is difficult to up to standard up to producing；Adopt in addition
Take uninterrupted discharge not only to cause significant wastage, and pollute environment.
The content of the invention
For overcome the deficiencies in the prior art, this uses time of periodic off-gases and flashed vapour in a kind of synthesis ammonia system of new offer
Receiving apparatus, it can realize that synthetic cyclic gas continuously arranges lazy purpose by this device, and by useful group in periodic off-gases and flashed vapour
Point recycled, with solve synthesis gas continuously discharge periodic off-gases and flash steam and caused by economic loss and environmental pollution.
The retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system, including ammonia convertor, one-level condensation separation tower,
B-grade condensation knockout tower, ammonia flash tank, compressor, the entrance of the one-level condensation separation tower and the ammonia outlet phase of ammonia convertor
Even, the gas vent of one-level condensation separation tower is connected with the entrance of B-grade condensation knockout tower, the entrance of the compressor respectively with
The gas vent of B-grade condensation knockout tower is connected with virgin gas entrance, and the outlet of compressor is connected with ammonia convertor, the one-level
Condensation separation tower is connected with the liquefied ammonia outlet of B-grade condensation knockout tower with ammonia flash tank, it is characterised in that the ammonia flash tank
Flash steam outlet be connected with the entrance of flash steam scrubbing tower, the periodic off-gases extracted out before compressor compresses provided with entrance by adjusting
The pipeline of section valve is connected with periodic off-gases scrubbing tower, and the weak aqua ammonia of the flash steam scrubbing tower is exported by the pipeline provided with pump with speeding
The weak aqua ammonia export pipeline of deflation scrubbing tower is connected with the entrance of heat exchanger, the outlet of the heat exchanger and the entrance of ammonia still
It is connected, a hot water outlet of the ammonia still bottom of towe is sequentially connected by pipeline and heat exchanger, water cooler, and the water cooler is cold
But the outlet of water is connected by pipeline with the tower top entrance of flash steam scrubbing tower and periodic off-gases scrubbing tower respectively.
Further, the steam (vapor) outlet of the ammonia still process column overhead is connected with condenser, backflash successively by pipeline, described
The fixed gas outlet of backflash is connected with ammonia torch, and liquefied ammonia outlet is connected with liquefied ammonia pipe network and ammonia still process column overhead respectively.
Further, the water inlet phase that another hot water outlet of the ammonia still bottom of towe passes through reboiler and ammonia still
Even, external boiler feedwater presses through vapours with and is connected by humidifier with the reboiler.
Further, pressure-regulating valve and accident emptying are provided with the gaseous phase outlet pipeline of the flash steam scrubbing tower
Valve.
Further, pressure-regulating valve and accident emptying are provided with the gaseous phase outlet pipeline of the periodic off-gases scrubbing tower
Valve.
Further, rectangular saddle ring random packing is filled in the periodic off-gases scrubbing tower and flash steam scrubbing tower, ammonia still
Rectifying section uses structured packing, and stripping section uses rectangular saddle ring random packing.
The beneficial effects of the utility model：The present apparatus is arranged in the ammonia synthesis circulatory system, and that is extracted out before compression speeds to put
Gas enters periodic off-gases scrubbing tower, and the liquefied ammonia after the separation of one-level B-grade condensation enters flash distillation by the flash steam after ammonia flash tank
Vapour scrubbing tower, periodic off-gases and flash steam obtain weak aqua ammonia after boiler water washing absorption ammonia respectively in this two tower, and two parts are dilute
Ammoniacal liquor is separated by being able to rectifying after ammonia still in the lump, not only recycles ammonia in weak aqua ammonia, and makes washing water circulation use, and
And ammonia and water are completely separated, liquefied ammonia pipe network is sent into after ammonia still tower overhead gas amino moiety is condensed, partly delivers to ammonia still
As backflow, the boiler water that bottom of towe is isolated is used for being flashed in periodic off-gases scrubbing tower in periodic off-gases, flash steam scrubbing tower tower top
Gas carries out circulation washing.Synthetic cyclic gas is realized by this device and continuously arranges lazy purpose, and by periodic off-gases and flashed vapour
Useful constituent recycled, reduce environmental pollution, reduce economic loss.
Brief description of the drawings
Fig. 1 is ammonia synthesis circulation process schematic diagram；
Fig. 2 is the retracting device schematic flow sheet of periodic off-gases and flashed vapour in synthesis ammonia system.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
As shown in Figure 1 and Figure 2, the retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system, including ammonia convertor 1,
One-level condensation separation tower 2, B-grade condensation knockout tower 3, ammonia flash tank 5, compressor 4, the entrance of the one-level condensation separation tower 2 with
The ammonia outlet of ammonia convertor 1 is connected, and the gas vent of one-level condensation separation tower 2 is connected with the entrance of B-grade condensation knockout tower 3,
The entrance of the compressor 4 is connected with the gas vent and the entrance of virgin gas 6 of B-grade condensation knockout tower 3 respectively, and compressor 4 goes out
Mouthful be connected with ammonia convertor 1, the liquefied ammonia of the one-level condensation separation tower 2 and B-grade condensation knockout tower 3 export with ammonia flash tank
5 are connected, and the flash steam outlet of the ammonia flash tank 5 is connected with the entrance of flash steam scrubbing tower 7, is extracted out before compressor compresses
Periodic off-gases are connected by the pipeline provided with inlet adjustment valve 9 with periodic off-gases scrubbing tower 8, the weak aqua ammonia of the flash steam scrubbing tower 7
Outlet is connected by the pipeline provided with pump with entrance of the weak aqua ammonia export pipeline of periodic off-gases scrubbing tower 8 with heat exchanger 11, institute
The outlet for stating heat exchanger 11 is connected with the entrance of ammonia still 12, a hot water outlet of the bottom of towe of ammonia still 12 by pipeline with
Heat exchanger 11, water cooler 13 are sequentially connected, and the outlet of the cooling water of water cooler 13 passes through pipeline and flash steam scrubbing tower 7 respectively
It is connected with the entrance of periodic off-gases scrubbing tower 8.
The steam (vapor) outlet of the ammonia still process column overhead is connected with condenser 14, backflash 15 successively by pipeline, the backflow
The fixed gas outlet of groove is connected with ammonia torch 16, and liquefied ammonia outlet is connected with liquefied ammonia pipe network 17 and the tower top of ammonia still 12 respectively.Ammonia still process
Column overhead ammonia steam is condensed to 40 DEG C by condenser 14, carries out gas-liquid separation into backflash, fixed gas delivers to ammonia torch 16
The tower top of ammonia still 12 is delivered to as backflow in emptying, the liquefied ammonia part separated, and remaining delivers to liquefied ammonia pipe network as liquefied ammonia product
17。
Another hot water outlet of the bottom of towe of ammonia still 12 is connected by reboiler 18 with the water inlet of ammonia still 12, outside
The boiler feedwater 20 connect presses through vapours 21 with and is connected by humidifier 19 with the reboiler 18.Ammonia still bottom of towe with boiling again
Device 18 is heated, and it presses through the saturated vapor of vapours and external boiler water after humidifier humidifying cooling and made in using
For thermal source.
The stable pressure-regulating valve 22 of control pressure and thing are provided with the gaseous phase outlet pipeline of the flash steam scrubbing tower
Therefore atmospheric valve 23.
Pressure-regulating valve 22 and accident atmospheric valve 23 are provided with the gaseous phase outlet pipeline of the periodic off-gases scrubbing tower.
As shown in figure 1, when system works, go out the pressure about 22.8MPa of compressor 4,39 DEG C of synthesis gas of temperature, it is preheated extremely
Enter synthetic tower 1 after 125 DEG C and carry out synthetic reaction, synthesis gas passes sequentially through one-level condensation separation tower 2, B-grade condensation knockout tower 3
With compressor 4, finally return to synthetic tower 1 and form closed circulation.Period supplements a small amount of virgin gas 6 to the head of compressor 4；And pass through
Liquefied ammonia after one-level condensation separation tower 2, B-grade condensation knockout tower 3 separate enters the formation sudden strain of a muscle of ammonia flash tank 5 after decompression in the lump
Steam is sent into the carrying out washing treatment of flash steam scrubbing tower 7；And gas after condensed separation largely enters compressor 4, and compressor
The periodic off-gases extracted out before compression are sent into the carrying out washing treatment of periodic off-gases scrubbing tower 8.
As shown in Fig. 2 periodic off-gases scrubbing tower import periodic off-gases pressure about 2.8MPa, boiler water is used in periodic off-gases scrubbing tower
Washed, the periodic off-gases discharge after washing is used as conversion gas, and the gas phase pipeline for discharging periodic off-gases is provided with pressure-regulating valve 22
With accident atmospheric valve 23, bottom of towe weak aqua ammonia enters ammonia still 12 after the preheating of heat exchanger 11；
The flash steam for entering flash steam scrubbing tower is washed with boiler water, and the flashed vapour after washing is as fuel gas, tower top
Gaseous pressure 1.2MPa, 40 DEG C of temperature, the vapor delivery line through tower top send fuel gas pipe network to reclaim.Bottom of towe weak aqua ammonia is through the pressure-raising of pump 10
Afterwards, mixed with periodic off-gases scrubbing tower bottom of towe weak aqua ammonia, being preheated to 180 DEG C through heat exchanger 11 enters ammonia still 12.
Rectifying separation, tower top are carried out in ammonia still 12 from the weak aqua ammonia of flash steam scrubbing tower 7 and periodic off-gases scrubbing tower 8
Gas ammonia pressure 1.7MPa, 45 DEG C of tower top temperature, 207 DEG C of column bottom temperature, the condensed device 14 of tower top ammonia steam, backflash 15 separate
Afterwards, fixed gas is delivered to ammonia torch 16 and is vented, and the liquefied ammonia that a separates part adds the tower top of ammonia still 12 as phegma, one
It is allocated as delivering to liquefied ammonia pipe network 17 for liquefied ammonia product.
The bottom of towe hot water of ammonia still 12 itself is cooled to after 81 DEG C again water cooled device 13 and entered by 11 pre- hot feed of heat exchanger
One step cools down, the boiler moisture two-way after cooling, and a-road-through piping is delivered to periodic off-gases washing column overhead and speeded for circulating washing
Deflate, another way delivers to flash steam by pipeline and washs column overhead for circulating washing flashed vapour.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc., the utility model should be included in
Protection domain within.
Claims (6)
1. the retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system, including ammonia convertor, one-level condensation separation tower, two
Level condensation separation tower, ammonia flash tank, compressor, the entrance of the one-level condensation separation tower and the ammonia outlet phase of ammonia convertor
Even, the gas vent of one-level condensation separation tower is connected with the entrance of B-grade condensation knockout tower, the entrance of the compressor respectively with
The gas vent of B-grade condensation knockout tower is connected with virgin gas entrance, and the outlet of compressor is connected with ammonia convertor, the one-level
Condensation separation tower is connected with the liquefied ammonia outlet of B-grade condensation knockout tower with ammonia flash tank, it is characterised in that the ammonia flash tank
Flash steam outlet be connected with the entrance of flash steam scrubbing tower, the periodic off-gases extracted out before compressor compresses provided with entrance by adjusting
The pipeline of section valve is connected with periodic off-gases scrubbing tower, and the weak aqua ammonia of the flash steam scrubbing tower is exported by the pipeline provided with pump with speeding
The weak aqua ammonia export pipeline of deflation scrubbing tower is connected with the entrance of heat exchanger, the outlet of the heat exchanger and the entrance of ammonia still
It is connected, a hot water outlet of the ammonia still bottom of towe is sequentially connected by pipeline and heat exchanger, water cooler, and the water cooler is cold
But the outlet of water is connected by pipeline with the tower top entrance of flash steam scrubbing tower and periodic off-gases scrubbing tower respectively.
2. the retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system according to claim 1, it is characterised in that
The steam (vapor) outlet of the ammonia still process column overhead is connected with condenser, backflash successively by pipeline, and the fixed gas of the backflash goes out
Mouth is connected with ammonia torch, and liquefied ammonia outlet is connected with liquefied ammonia pipe network and ammonia still process column overhead respectively.
3. the retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system according to claim 1, it is characterised in that
Another hot water outlet of the ammonia still bottom of towe is connected by reboiler with the water inlet of ammonia still, external boiler feedwater with
In press through vapours and be connected by humidifier with the reboiler.
4. the retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system according to claim 1, it is characterised in that
Pressure-regulating valve and accident atmospheric valve are provided with the gaseous phase outlet pipeline of the flash steam scrubbing tower.
5. the retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system according to claim 1, it is characterised in that
Pressure-regulating valve and accident atmospheric valve are provided with the gaseous phase outlet pipeline of the periodic off-gases scrubbing tower.
6. the retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system according to claim 1, it is characterised in that
Rectangular saddle ring random packing is filled in the periodic off-gases scrubbing tower and flash steam scrubbing tower, the rectifying section of ammonia still is filled out using regular
Material, stripping section use rectangular saddle ring random packing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720930239.8U CN207030977U (en) | 2017-07-28 | 2017-07-28 | The retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system |
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| CN201720930239.8U CN207030977U (en) | 2017-07-28 | 2017-07-28 | The retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107445179A (en) * | 2017-07-28 | 2017-12-08 | 天脊煤化工集团股份有限公司 | The retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107445179A (en) * | 2017-07-28 | 2017-12-08 | 天脊煤化工集团股份有限公司 | The retracting device of periodic off-gases and flashed vapour in a kind of synthesis ammonia system |
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