CN220589496U - Ammonia synthesis flash steam recovery device - Google Patents
Ammonia synthesis flash steam recovery device Download PDFInfo
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- CN220589496U CN220589496U CN202320659456.3U CN202320659456U CN220589496U CN 220589496 U CN220589496 U CN 220589496U CN 202320659456 U CN202320659456 U CN 202320659456U CN 220589496 U CN220589496 U CN 220589496U
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- Prior art keywords
- ammonia
- liquid level
- water
- pipeline
- recovery device
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 69
- 238000011084 recovery Methods 0.000 title claims abstract description 39
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 25
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 23
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 36
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 36
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 34
- 238000010992 reflux Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims 1
- 238000001704 evaporation Methods 0.000 claims 1
- 239000000047 product Substances 0.000 abstract description 8
- 239000006227 byproduct Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 37
- 238000005406 washing Methods 0.000 description 8
- 238000010926 purge Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The utility model discloses a flash gas recovery device for ammonia synthesis. The device comprises an ammonia recovery tower, a circulating pump, a plurality of meters and pipelines, wherein the ammonia recovery tower comprises three parts, namely a container part, a heat exchange part and an absorption part from bottom to top. The device not only solves the problem of environmental pollution caused by directly discharging the ammonia-containing flash vapor into the torch, but also recycles ammonia in the flash vapor and byproducts of dilute ammonia water products, improves the running benefit of the device, and has the characteristics of reasonable flow design, less equipment number, low construction investment, convenient operation and the like.
Description
Technical Field
The utility model belongs to the technical field of chemical synthesis and environmental protection, and particularly relates to a flash gas recovery device for ammonia synthesis.
Background
In the ammonia synthesis industry, the crude liquid ammonia product obtained in the synthesis reaction section is decompressed and then enters a flash tank for separation, the liquid phase is finally obtained into the liquid ammonia product, and the gas phase is ammonia-containing flash steam with main component NH 3 、H 2 、N 2 And Ar, wherein NH 3 About 20 mol% of the total amount of the flash gas, which is normally discharged directly to the flare for combustion in conventional industrial processes. Therefore, the recycling problem of ammonia flash vapor in the ammonia synthesis device becomes an important factor affecting the normal production of enterprises.
Patent CN207030977U discloses a recovery device for purge gas and flash gas in a synthetic ammonia system, wherein the purge gas extracted from the prior compression enters a purge gas washing tower, and the flash gas after the first-stage secondary condensation separation passes through an ammonia flash tank enters a flash gas washing tower, and the purge gas and the flash gas are respectively washed by boiler water to absorb ammonia in the two towers to obtain diluted ammonia water, and the two parts of diluted ammonia water are rectified and separated together by the ammonia distillation tower.
Patent CN201620816749.8 discloses an energy-saving recovery system for synthesis ammonia purge gas and flash gas, wherein the purge gas from the synthesis system enters a high-pressure ammonia washing tower to be contacted with washing water, diluted ammonia water is obtained at the bottom of the tower, the gas at the top of the tower enters a hydrogen membrane separation device, the flash gas enters a low-pressure ammonia washing tower to be contacted with the washing water, the non-condensable gas at the top of the tower enters a heating furnace fuel gas pipeline, the diluted ammonia water obtained at the bottom of the tower, and the diluted ammonia water of the high-pressure ammonia washing tower and the low-pressure ammonia washing tower are mixed and enter a diluted ammonia water tank.
The process flow and the device mainly have the defects of low concentration of the obtained dilute ammonia water, complex process flow, more equipment, higher device investment and the like.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide an ammonia synthesis flash vapor recovery device. In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the device consists of an ammonia recovery tower, a circulating pump, a plurality of meters and pipelines, wherein the ammonia recovery tower consists of three parts, namely a container part, a heat exchange part and an absorption part from bottom to top.
The technical scheme of the utility model is as follows: the seal head at the lower part of the container part is provided with a dilute ammonia water outlet, and the middle part of the container part is at least provided with a liquid level meter port;
a plurality of groups of heat exchange pipes are arranged in the heat exchange part, and a circulating water inlet and a circulating water outlet are arranged on the shell side of the heat exchange part;
an ammonia-containing flash gas inlet and a dilute ammonia water reflux port are arranged below the shell side of the absorption part, and a desalted water inlet and a tail gas outlet are arranged above the shell side.
The technical scheme of the utility model is as follows: the inlet pipeline of the circulating pump is connected with the dilute ammonia water outlet, the outlet pipeline of the circulating pump is divided into two parts, one part of dilute ammonia water is taken as a product to be sent out of the limit, and the other part of dilute ammonia water is taken as reflux liquid to be connected with the pipe orifice N5.
The technical scheme of the utility model is as follows: the circulating water inlet and the circulating water outlet of the heat exchange part are respectively connected with a circulating water supply pipeline and a circulating water return pipeline from outside the boundary.
The technical scheme of the utility model is as follows: the ammonia-containing flash gas inlet is connected with a flash gas pipeline from ammonia synthesis; the tail gas outlet is connected with a tail gas pipeline which is sent to the outside of the boundary, and the desalted water inlet is connected with a desalted water pipeline from the outside of the boundary.
The technical scheme of the utility model is as follows: and a filler or a tray is arranged in the absorption part of the ammonia recovery tower.
The technical scheme of the utility model is as follows: the liquid level meter of the ammonia recovery tower, the liquid level transmitter connected with the liquid level meter and the liquid level regulating valve on the dilute ammonia water pipeline are connected through a liquid level controller and a signal line to form a liquid level regulating control system.
The beneficial effects of the utility model are as follows: the ammonia synthesis flash gas recovery device not only solves the problem of environmental pollution caused by directly discharging the ammonia-containing flash gas into the torch, but also recycles ammonia in the flash gas and byproducts of dilute ammonia water products, improves the running benefit of the device, and has the characteristics of reasonable flow design, less equipment number, low construction investment, convenient operation and the like.
Drawings
Fig. 1 is a schematic view of the overall structure of the present utility model.
In the figure: 1 is a container part, 2 is a heat exchange part, 3 is an absorption part, C01-ammonia recovery tower, P01-circulating pump, N1-ammonia-containing flash gas inlet, N2-dilute ammonia water outlet, N3-tail gas outlet, N4-desalted water inlet, N5-dilute ammonia water reflux port, N6-circulating water inlet, L1 a-first liquid level meter port, L1 a-second liquid level meter port, LT 01-liquid level transmitter, LIC 01-liquid level controller and LV 01-liquid level regulating valve.
Detailed Description
The utility model will be described in detail below with reference to the attached drawings and examples, but the scope of the utility model is not limited thereto:
as shown in fig. 1, an ammonia synthesis flash vapor recovery device is composed of an ammonia recovery tower C01, a circulating pump P01, a plurality of meters and pipelines, wherein the ammonia recovery tower C01 is composed of three parts, namely a container part 1, a heat exchange part 2 and an absorption part 3 from bottom to top.
The lower end socket of the container part 1 is provided with a dilute ammonia water outlet N2, and the middle part of the container part 1 is at least provided with a liquid level meter port;
a plurality of groups of heat exchange pipes are arranged in the heat exchange part 2, and a circulating water inlet N6 and a circulating water outlet N7 are arranged on the shell side of the heat exchange part;
an ammonia-containing flash steam inlet N1 and a dilute ammonia water reflux port N5 are arranged below the shell side of the absorption part 3, and a desalted water inlet N4 and a tail gas outlet N3 are arranged above the shell side.
The inlet pipeline of the circulating pump P01 is connected with the dilute ammonia water outlet N2, the outlet pipeline is divided into two parts, one part of dilute ammonia water is taken as a product to be sent out of the boundary, and the other part of dilute ammonia water is taken as reflux liquid to be connected with the pipe orifice N5.
The circulating water inlet N6 and the circulating water outlet N7 of the heat exchange part 2 are respectively connected with a circulating water supply pipeline and a circulating water return pipeline from outside the boundary.
The ammonia-containing flash gas inlet N1 is connected with a flash gas pipeline from ammonia synthesis; the tail gas outlet N3 is connected with a tail gas pipeline which is sent to the outside of the boundary, and the desalted water inlet N4 is connected with a desalted water pipeline from the outside of the boundary.
A packing or a tray is arranged in the absorption part 3 of the ammonia recovery tower C01.
The liquid level meter of the ammonia recovery tower C01, the liquid level transmitter LT01 connected with the liquid level meter and the liquid level regulating valve LV01 on the dilute ammonia water pipeline are connected through the liquid level controller LIC01 and a signal line to form a liquid level regulating control system.
The working process of the utility model is as follows: the flash gas from the ammonia synthesis section enters the lower part of an absorption part of an ammonia recovery tower and is absorbed in countercurrent with desalted water from outside the boundary on a filler or a tray, tail gas obtained after ammonia removal is discharged from the top of the tower to outside the boundary, dilute ammonia water solution obtained after absorption is mixed with reflux liquid from a circulating pump to enter the pipe side of a heat exchange part of the ammonia recovery tower, the mixture enters a container part of the ammonia recovery tower after heat exchange with circulating water at the shell side, and the bottom dilute ammonia water is further separated into two material flows after passing through the circulating pump (P01), wherein one dilute ammonia water is sent to outside the boundary as a product, and the other dilute ammonia water is returned to the ammonia recovery tower as reflux liquid.
The specific implementation process is as follows: 400Nm from ammonia synthesis section 3 Flash gas of/h (temperature 10 ℃ C., pressure 2.5MPag, NH therein) 3 ：19.3％，H 2 ：55.9％，N 2 :24.6%, ar:0.2% by volume fraction), and the ammonia is taken into the lower part of the absorption part of the ammonia recovery tower and is absorbed by the filler in countercurrent with 480kg/h desalted water from outside the limit, and 320Nm is obtained after ammonia removal 3 Tail gas/H (temperature 44 ℃ C., pressure 2.5MPag, H therein) 2 ：69.3％，N 2 :30.5%, ar:0.2% by volume) is discharged from the top of the tower to the outside of the boundary, and is suckedThe recovered reflux liquid is mixed with the reflux liquid from the circulating pump and enters the pipe side of the heat exchange part of the ammonia recovery tower, the mixture is subjected to heat exchange with the circulating water at the shell side and then enters the container part of the ammonia recovery tower, the bottom diluted ammonia water is further divided into two material flows through the circulating pump, one material flow is formed by the diluted ammonia water (the flow is 460kg/h, the molar concentration is 13%) and is sent out of the limit as a product, and the other material flow is returned to the ammonia recovery tower as the reflux liquid.
The foregoing embodiments and description are merely illustrative of the principles of the present utility model, and are not intended to limit the scope of the utility model, which is susceptible to various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications fall within the scope of the utility model as hereinafter claimed. The utility model is not related in part to the same as or can be practiced with the prior art.
Claims (7)
1. An ammonia synthesis flash vapor recovery device, which is characterized in that: the device comprises an ammonia recovery tower (C01), a circulating pump (P01), a plurality of meters and pipelines, wherein the ammonia recovery tower (C01) comprises three parts, namely a container part (1), a heat exchange part (2) and an absorption part (3) from bottom to top.
2. The ammonia synthesis flash gas recovery device of claim 1, wherein: the seal head at the lower part of the container part (1) is provided with a dilute ammonia water outlet (N2), and the middle part of the container part (1) is at least provided with a liquid level meter port;
a plurality of groups of heat exchange pipes are arranged in the heat exchange part (2), and a circulating water inlet (N6) and a circulating water outlet (N7) are arranged on the shell side of the heat exchange part;
an ammonia-containing flash evaporation gas inlet (N1) and a dilute ammonia water reflux port (N5) are arranged below the shell side of the absorption part (3), and a desalted water inlet (N4) and a tail gas outlet (N3) are arranged above the shell side.
3. The ammonia synthesis flash gas recovery device of claim 1, wherein: the inlet pipeline of the circulating pump (P01) is connected with the dilute ammonia water outlet (N2), the outlet pipeline is divided into two parts, one part of dilute ammonia water is taken as a product to be sent out of the boundary, and the other part of dilute ammonia water is taken as reflux liquid to be connected with the dilute ammonia water reflux port (N5).
4. The ammonia synthesis flash gas recovery device of claim 1, wherein: the circulating water inlet (N6) and the circulating water outlet (N7) of the heat exchange part (2) are respectively connected with an off-boundary circulating water supply pipeline and a circulating water return pipeline.
5. The ammonia synthesis flash gas recovery device of claim 1, wherein: an ammonia-containing flash gas inlet (N1) is connected to a flash gas line from ammonia synthesis; the tail gas outlet (N3) is connected with a tail gas pipeline which is sent to the outside of the boundary, and the desalted water inlet (N4) is connected with a desalted water pipeline which is sent from the outside of the boundary.
6. The ammonia synthesis flash gas recovery device of claim 1, wherein: a filler or a tray is arranged in the absorption part (3) of the ammonia recovery tower (C01).
7. The ammonia synthesis flash gas recovery device of claim 1, wherein: the liquid level meter of the ammonia recovery tower (C01), the liquid level transmitter (LT 01) connected with the liquid level meter and the liquid level regulating valve (LV 01) on the dilute ammonia water pipeline are connected through the liquid level controller (LIC 01) and the signal line to form a liquid level regulating control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320659456.3U CN220589496U (en) | 2023-03-30 | 2023-03-30 | Ammonia synthesis flash steam recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320659456.3U CN220589496U (en) | 2023-03-30 | 2023-03-30 | Ammonia synthesis flash steam recovery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220589496U true CN220589496U (en) | 2024-03-15 |
Family
ID=90179838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320659456.3U Active CN220589496U (en) | 2023-03-30 | 2023-03-30 | Ammonia synthesis flash steam recovery device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220589496U (en) |
-
2023
- 2023-03-30 CN CN202320659456.3U patent/CN220589496U/en active Active
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| GR01 | Patent grant | ||
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