CN216923982U - Ammonia injection system of synthetic ammonia device - Google Patents
Ammonia injection system of synthetic ammonia device Download PDFInfo
- Publication number
- CN216923982U CN216923982U CN202122057654.6U CN202122057654U CN216923982U CN 216923982 U CN216923982 U CN 216923982U CN 202122057654 U CN202122057654 U CN 202122057654U CN 216923982 U CN216923982 U CN 216923982U
- Authority
- CN
- China
- Prior art keywords
- ammonia
- pipeline
- valve
- ammonia injection
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model relates to an ammonia injection system of a synthetic ammonia device, which sequentially comprises an ammonia inlet process, a pressure boosting process and a pressure difference ammonia injection process, wherein liquid ammonia is firstly sent into an ammonia injection tank through an ammonia inlet valve and a pipeline where the ammonia inlet valve is located, then gas is sent into the ammonia injection tank through the pressure boosting valve and the pipeline where the pressure boosting valve is located, the ammonia injection tank is boosted, and finally the liquid ammonia is injected into a process pipeline needing ammonia injection from the ammonia injection tank through the ammonia injection valve and the pipeline where the pressure boosting valve is located.
Description
Technical Field
The utility model relates to an ammonia injection system of a synthetic ammonia device.
Background
When the ammonia synthesis device is started, the catalyst needs to be heated and reduced, and a large amount of water is generated in the heating and reducing process. The operation temperature of an ammonia cooler in a synthetic ammonia system is generally lower than 0 ℃, and water generated in the process of heating and reducing can be condensed into ice in the ammonia cooler, so that the safety of the system is endangered.
In order to solve the problems, in the temperature-rising reduction stage, liquid ammonia needs to be injected before an ammonia cooler, and the freezing point of water needs to be reduced so that the water is not condensed in the ammonia cooler. Usually, the ammonia injection pump is arranged in the ammonia synthesis device, but the lift is very high, usually up to 1400m, so that the investment is large, the later maintenance and overhaul are difficult, and potential safety hazards exist.
Therefore, further improvement is needed for the ammonia injection system of the ammonia synthesis device.
SUMMERY OF THE UTILITY MODEL
The first technical problem to be solved by the utility model is to provide an ammonia injection system of a synthetic ammonia device, which does not contain moving equipment, has small investment and basically does not need maintenance in the later period, aiming at the current situation of the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
an ammonia injection system of a synthetic ammonia device comprises an ammonia injection tank, wherein a liquid level meter for detecting the liquid level is arranged on the ammonia injection tank; the ammonia injection tank is connected with a synthetic ammonia system pipeline through a first pipeline, a pressure boosting valve arranged close to the synthetic ammonia system pipeline is arranged on the first pipeline, and a pressure detector is arranged between the ammonia injection tank and the synthetic ammonia system pipeline; the ammonia injection tank is connected with a liquid ammonia supply source through a second pipeline, and an ammonia inlet valve is arranged on the second pipeline; the ammonia injection tank is connected with a process pipeline needing ammonia injection through a third pipeline, and an ammonia injection valve is arranged on the third pipeline.
The ammonia injection system of the ammonia synthesis device comprises:
A. before the temperature-rising reduction stage of the catalyst of the ammonia synthesis device, opening an ammonia inlet valve, injecting liquid ammonia into an ammonia injection tank, and controlling the amount of the liquid ammonia in the ammonia injection tank by a liquid level meter; closing an ammonia inlet valve after the liquid ammonia amount in the ammonia injection tank reaches the required amount; the volume of the ammonia injection tank at least meets the requirement of one-time ammonia injection amount;
B. the pressure of the ammonia injection tank is increased through a synthetic ammonia system;
after closing the ammonia inlet valve, when the pressure of the synthetic ammonia system is higher than the pressure of the ammonia injection tank, opening the pressure rising valve, and allowing the gas of the synthetic ammonia system to enter the ammonia injection tank to rise the pressure of the ammonia injection tank;
C. injecting liquid ammonia in the ammonia injection tank into the synthetic ammonia system through potential difference or pressure difference;
under the condition that the pressure of the pipeline of the ammonia synthesis system is higher than the pressure of the process pipeline needing ammonia injection, the pressure difference is utilized to make the liquid ammonia in the ammonia injection tank flow into the process pipeline needing ammonia injection; when the pressure difference can not meet the requirement, the position of the ammonia injection tank is lifted, and liquid ammonia flows into a process pipeline needing ammonia injection by utilizing the potential difference;
when ammonia needs to be injected, the ammonia injection valve is opened, so that liquid ammonia flows into the process pipeline needing ammonia injection, and the injection flow is controlled through the ammonia injection valve.
Preferably, the synthetic ammonia system pipeline in the step C is a synthetic gas compressor outlet pipeline, and the process pipeline requiring ammonia injection is an ammonia cooler inlet pipeline.
Preferably, the top of the ammonia injection tank is connected with a vent valve, and in the ammonia feeding process of the ammonia injection tank, the vent valve is opened to discharge gas in the ammonia injection tank into a torch.
Preferably, a shut-off valve set is arranged on an upstream pipeline of the ammonia inlet valve, and in the step B, after the ammonia inlet valve is closed and before the pressure is increased, the shut-off valve set is closed, so that the synthesis gas is prevented from entering a low-pressure system and being dangerous to the safety.
Preferably, the shut-off valve block comprises two shut-off valves and an 8-shaped blind plate positioned between the two shut-off valves.
Preferably, a check valve is arranged between the ammonia inlet valve and the shutoff valve group to prevent the synthesis gas from entering a low-pressure system and causing accidents.
Preferably, a flow-limiting orifice plate is arranged between the ammonia inlet valve and the check valve, and when the check valve and the valve block are failed, the flow-limiting orifice plate is used for reducing the flow of the synthesis gas entering and exiting the low-pressure system.
Preferably, a shut-off valve set is arranged on an upstream pipeline of the pressure rising valve, a shut-off valve set is arranged on an upstream pipeline of the ammonia injection valve, and each shut-off valve set comprises two shut-off valves and an 8-shaped blind plate and is used for isolating the ammonia injection system from the synthetic ammonia system after the ammonia injection process is completed.
Preferably, the ammonia injection tank is provided with a safety valve to prevent overpressure.
Preferably, a check valve is arranged on a downstream pipeline of the pressure rising valve and used for preventing backflow of liquid ammonia.
Compared with the prior art, the utility model has the advantages that: the ammonia injection process comprises an ammonia injection process, a pressure boosting process and a pressure difference ammonia injection process, wherein liquid ammonia is fed into an ammonia injection tank through an ammonia inlet valve and a pipeline, gas is fed into the ammonia injection tank through the pressure boosting valve and the pipeline, the ammonia injection tank is boosted, and the liquid ammonia is injected into a process pipeline needing ammonia injection from the ammonia injection tank through the ammonia injection valve and the pipeline.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
The utility model is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the ammonia injection system of the ammonia synthesis apparatus of the present embodiment includes an ammonia injection tank 1, wherein a liquid level meter 5 for detecting a liquid level is disposed on the ammonia injection tank 1; the ammonia injection tank 1 is connected with a synthetic ammonia system pipeline through a first pipeline, a pressure boosting valve 3 which is arranged close to the synthetic ammonia system pipeline is arranged on the first pipeline, and a pressure detector is arranged between the ammonia injection tank 1 and the synthetic ammonia system pipeline; the ammonia injection tank 1 is connected with a liquid ammonia supply source through a second pipeline, and an ammonia inlet valve 2 is arranged on the second pipeline; the ammonia injection tank 1 is connected with a process pipeline needing ammonia injection through a third pipeline, and an ammonia injection valve 4 is arranged on the third pipeline.
The ammonia injection method in the embodiment comprises the following steps:
A. before the temperature-rising reduction stage of the catalyst of the ammonia synthesis device, opening an ammonia inlet valve 2, injecting liquid ammonia into an ammonia injection tank 1, and controlling the amount of liquid ammonia in the ammonia injection tank by a liquid level meter 5, wherein the amount of liquid ammonia is determined according to the type and the filling amount of the catalyst, and the amount of injected liquid ammonia is 25 t; after the amount of liquid ammonia in the ammonia injection tank reaches the required amount, closing the ammonia inlet valve 2; the volume of the ammonia injection tank 1 at least meets the requirement of one-time ammonia injection amount;
B. the pressure of the ammonia injection tank 1 is increased through a synthetic ammonia system;
after an ammonia inlet valve 2 is closed, when the pressure (1.6-1.8 MPAG) of a synthetic ammonia system is higher than the pressure (1.4MPAG) of an ammonia injection tank, a pressure boosting valve 3 is opened, gas of the synthetic ammonia system enters the ammonia injection tank 1, so that the pressure of the ammonia injection tank 1 is raised, specifically, the temperature is raised from 1.4MPAG to 9MPAG in the first stage of the temperature raising and reducing of a synthetic ammonia catalyst, and is raised from 9MPAG to 12MPAG in the second stage;
C. injecting liquid ammonia in the ammonia injection tank 1 into the synthetic ammonia system through potential difference or pressure difference;
when the pressure (9.2-12.2 MPAG) of the pipeline of the ammonia synthesis system is higher than the pressure (9-12 MPAG) of the process pipeline needing ammonia injection, the liquid ammonia in the ammonia injection tank 1 flows into the process pipeline needing ammonia injection by utilizing the pressure difference;
when ammonia needs to be injected, the ammonia injection valve 4 is opened, liquid ammonia flows into the process pipeline needing to be injected, and the injection flow (50-100 Kg/h) is controlled through the ammonia injection valve 4.
And D, the synthetic ammonia system pipeline in the step C is an outlet pipeline of a synthetic gas compressor, and the process pipeline needing ammonia injection is an inlet pipeline of an ammonia cooler.
The top of the ammonia injection tank 1 is connected with a vent valve, and in the ammonia feeding process of the ammonia injection tank 1, the vent valve 8 is opened to discharge the gas in the ammonia injection tank 1 into a torch.
And a cut-off valve group 14 is arranged on an upstream pipeline of the ammonia inlet valve 2, and in the step B, the cut-off valve group 14 is closed after the ammonia inlet valve 2 is closed and before the pressure is increased, so that the situation that the synthesis gas is communicated into a low-pressure system and the safety is endangered is avoided.
The shut-off valve block 14 comprises two shut-off valves and an 8-shaped blind plate located between the two shut-off valves.
A first check valve 13 is arranged between the ammonia inlet valve 2 and the shut-off valve group 14 to prevent synthetic gas from entering a low-pressure system and causing accidents.
A flow limiting orifice plate 12 is arranged between the ammonia inlet valve 2 and the first check valve 13, and is used for reducing the flow of the synthesis gas to and from the low-pressure system when the first check valve 13 and the shut-off valve group 14 fail.
The upstream pipeline of the pressure rising valve 3 is provided with a cut-off valve group, the upstream pipeline of the ammonia injection valve 4 is provided with a cut-off valve group, and each cut-off valve group comprises two cut-off valves and an 8-shaped blind plate and is used for isolating the ammonia injection system from the synthetic ammonia system after the ammonia injection process is finished.
The ammonia injection tank 1 is provided with a safety valve 7 to prevent overpressure.
And a second check valve 9 is arranged on a downstream pipeline of the booster valve 3 and used for preventing liquid ammonia from flowing backwards.
The embodiment sequentially comprises an ammonia inlet process, a pressure boosting process and a pressure difference ammonia injection process, wherein liquid ammonia is firstly sent into an ammonia injection tank through an ammonia inlet valve and a pipeline where the ammonia inlet valve is located, then gas is sent into the ammonia injection tank through the pressure boosting valve and the pipeline where the pressure boosting valve is located, the ammonia injection tank is boosted, and finally the liquid ammonia is injected into a process pipeline needing ammonia injection from the ammonia injection tank through the ammonia injection valve and the pipeline where the pressure boosting valve is located.
Claims (10)
1. An ammonia injection system of an ammonia synthesis device comprises an ammonia injection tank (1), and is characterized in that: a liquid level meter (5) for detecting the liquid level is arranged on the ammonia injection tank (1); the ammonia injection tank (1) is connected with a synthetic ammonia system pipeline through a first pipeline, a pressure boosting valve (3) which is arranged close to the synthetic ammonia system pipeline is arranged on the first pipeline, and a pressure detector is arranged between the ammonia injection tank (1) and the synthetic ammonia system pipeline; the ammonia injection tank (1) is connected with a liquid ammonia supply source through a second pipeline, and an ammonia inlet valve (2) is arranged on the second pipeline; the ammonia injection tank (1) is connected with a process pipeline needing ammonia injection through a third pipeline, and an ammonia injection valve (4) is arranged on the third pipeline.
2. The ammonia injection system of an ammonia synthesis plant according to claim 1, characterized in that: the synthetic ammonia system pipeline is a synthetic gas compressor outlet pipeline, and the process pipeline needing ammonia injection is an ammonia cooler inlet pipeline.
3. The ammonia injection system of an ammonia synthesis plant according to claim 1, characterized in that: the top of the ammonia injection tank (1) is connected with a vent valve, and in the ammonia feeding process of the ammonia injection tank (1), the vent valve (8) is opened to discharge the gas in the ammonia injection tank (1) into a torch.
4. The ammonia injection system of an ammonia synthesis plant according to claim 1, characterized in that: and a cut-off valve group (14) is arranged on an upstream pipeline of the ammonia inlet valve (2) and used for closing the cut-off valve group (14) after the ammonia inlet valve (2) is closed and before the pressure is increased so as to prevent the synthesis gas from entering a low-pressure system and endangering the safety.
5. The ammonia injection system for an ammonia synthesis plant according to claim 4, wherein: the shut-off valve group (14) comprises two shut-off valves and an 8-shaped blind plate positioned between the two shut-off valves.
6. The ammonia injection system for an ammonia synthesis plant according to claim 4, wherein: a first check valve (13) is arranged between the ammonia inlet valve (2) and the cut-off valve group (14) to prevent the synthetic gas from entering a low-pressure system and causing accidents.
7. The ammonia injection system for an ammonia synthesis plant according to claim 6, wherein: and a flow limiting orifice plate (12) is arranged between the ammonia inlet valve (2) and the first check valve (13), and is used for reducing the flow of the synthesis gas entering and exiting the low-pressure system under the failure state of the first check valve (13) and the shut-off valve group (14).
8. The ammonia injection system of an ammonia synthesis plant according to claim 1, characterized in that: be provided with a shut-off valve group on the upper reaches pipeline of liter pressure valve (3), be provided with a shut-off valve group on the upper reaches pipeline of annotating ammonia valve (4), every shut-off valve group contains two trip valves and an 8 word blind plate for will annotate ammonia system and synthetic ammonia system isolation after the ammonia process is accomplished.
9. The ammonia injection system of an ammonia synthesis plant according to claim 1, characterized in that: the ammonia injection tank (1) is provided with a safety valve (7) for preventing overpressure.
10. The ammonia injection system of an ammonia synthesis plant according to claim 1, characterized in that: and a second check valve (9) is arranged on a downstream pipeline of the pressure rising valve (3) and used for preventing backflow of liquid ammonia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122057654.6U CN216923982U (en) | 2021-08-30 | 2021-08-30 | Ammonia injection system of synthetic ammonia device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122057654.6U CN216923982U (en) | 2021-08-30 | 2021-08-30 | Ammonia injection system of synthetic ammonia device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216923982U true CN216923982U (en) | 2022-07-08 |
Family
ID=82222429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122057654.6U Active CN216923982U (en) | 2021-08-30 | 2021-08-30 | Ammonia injection system of synthetic ammonia device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216923982U (en) |
-
2021
- 2021-08-30 CN CN202122057654.6U patent/CN216923982U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112212208B (en) | Filling system and method for combined work of hydrogenation machine and supercharging equipment | |
| CN206386680U (en) | From the LNG fluid reservoir control pressure systems of supercharging | |
| CN102194534B (en) | High-precision pressing and depressing process for pre-service hydraulic pressure test of steam generator secondary side | |
| CN111536420A (en) | Safe filling system and method after liquid ethane pipeline maintenance | |
| WO2023134370A1 (en) | Gas injection control system for blast furnace, and control method | |
| CN213810006U (en) | Filling system for combined work of hydrogenation machine and supercharging equipment | |
| CN216923982U (en) | Ammonia injection system of synthetic ammonia device | |
| CN106870945B (en) | Natural gas pressure regulating skid-mounted device with multistage safety protection function | |
| CN104165266B (en) | A kind of pressure reduction formula liquefied natural gas filling station adds injection system and method thereof | |
| JP2016502102A (en) | Boiling water reactor start / stop hydrogen injection system and method | |
| CN208674271U (en) | One proton exchanging film fuel battery automobile hydrogen supply and hydrogen gas circulating system | |
| CN113864633A (en) | Ammonia injection method of ammonia synthesis device | |
| CN210601032U (en) | Novel liquefied natural gas unloading system capable of being started quickly | |
| CN202055817U (en) | Deep well and high-temperature high-pressure well testing device | |
| CN207230152U (en) | A kind of low-temperature liquid filling system | |
| CN113999968B (en) | Autoclave acid adding system and control method | |
| CN110953483A (en) | Chemical agent adding method and device | |
| CN108571651A (en) | A kind of liquefied ammonia recovery system and its recovery method | |
| CN202430106U (en) | Natural gas supply guaranteeing system of glass tank furnace | |
| CN216243525U (en) | Optimized L-CNG gas station storage tank pressurization system | |
| CN110296322B (en) | Liquid CO 2 Loading and unloading vehicle integrated device and application method thereof | |
| CN110821710A (en) | Rocket engine test inlet pressure rapid pressurizing device and liquid oxygen supply system | |
| CN105508873A (en) | Low-temperature vessel and vaporizer self-pressurization system and method | |
| CN207408105U (en) | Moveable turbocharger oil-servicing facilities | |
| CN217356916U (en) | Offshore oil and gas field torch gas pressurization recovery system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |