CN215215754U - Marine evaporation ammonia collecting system - Google Patents
Marine evaporation ammonia collecting system Download PDFInfo
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- CN215215754U CN215215754U CN202120343489.8U CN202120343489U CN215215754U CN 215215754 U CN215215754 U CN 215215754U CN 202120343489 U CN202120343489 U CN 202120343489U CN 215215754 U CN215215754 U CN 215215754U
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Abstract
The utility model provides a marine evaporation ammonia collecting system, there is the liquid ammonia storage cabin that has pressure sensor, there is one or more ammonia high pressure collection tank, ammonia high pressure collection tank passes through return line and liquid ammonia storage cabin, ammonia high pressure collection tank establishes ties and forms the circulation pipeline, connect in parallel between the ammonia high pressure collection tank, be provided with first check valve on the return line that the ammonia compressor leads to ammonia high pressure collection tank, be provided with first valve on the return line that the ammonia high pressure collection tank leads to liquid ammonia storage cabin, ammonia high pressure collection tank passes through the pipeline intercommunication with liquid ammonia fuel supply system, be provided with the second valve on the pipeline between ammonia high pressure collection tank and the liquid ammonia fuel supply system. The evaporative ammonia gas collecting system for the ship has the advantages of simple equipment configuration, low manufacturing cost, low operation and maintenance cost and greatly reduced power consumption. The collected ammonia gas can be further used as ship fuel after being treated, so that no fuel is wasted, and the safety of ship navigation is ensured.
Description
Technical Field
The invention relates to the field of marine liquid ammonia storage, in particular to a liquid ammonia evaporation gas collecting system for collecting ammonia gas accumulated in a marine liquid ammonia storage cabin.
Background
Currently, ammonia is widely used as an important chemical raw material in the fields of pesticides, medicines, industry, metallurgy and the like, and can also be used as a ship propulsion fuel. To achieve on-board storage of ammonia, it is often pressurized or cooled for storage in a liquid state to save storage space.
Different types of liquid ammonia storage tanks are generally adopted according to the size of the ship, the liquid ammonia carrying volume and the like. The liquid ammonia storage cabin is generally divided into a semi-cold semi-pressure type, the design temperature is-40 ℃, the design pressure is 4-10 barg, and the C-type storage cabin is suitable for storage with the volume of about 6000m3 and below; the full-cooling type, the design temperature is-40 ℃, the design pressure is less than or equal to 0.7barg, and the A-type storage cabin, the B-type storage cabin or the film-type storage cabin is suitable for storage with the volume of about 6000m3 and above. The liquid ammonia fuel tank or the liquid ammonia transportation tank is collectively called a liquid ammonia storage tank.
The ammonia gas is extremely toxic, and the evaporated gas in the liquid ammonia storage cabin is not allowed to be directly discharged to the outside of the cabin. Because the temperature in the cabin is greatly different from the temperature of the external environment, heat continuously enters the cabin through heat conduction or radiation and other modes, and liquid ammonia in the storage cabin is volatilized constantly to generate evaporation gas. During the navigation of the ship, the pressure in the liquid ammonia storage cabin is continuously increased due to the accumulation of the evaporation gas, the evaporation gas in the cabin needs to be transferred, and otherwise, safety accidents are caused.
Usually, a reliquefaction device is used to reliquefy the boil-off gas in the liquid ammonia storage tank into liquid, which is returned to the liquid ammonia storage tank. However, the reliquefaction equipment is expensive, the process is complex, a large amount of electric energy is consumed during the operation, and the investment return is poor.
Disclosure of Invention
In order to solve the above problems, the present invention provides a system for collecting liquid ammonia boil-off gas for a ship, which aims to achieve the purpose of collecting the liquid ammonia boil-off gas accumulated in a liquid ammonia storage tank, and adopts the following technical scheme:
the utility model provides a marine evaporation ammonia collection system, has the liquid ammonia storage tank that has pressure sensor, and liquid ammonia storage tank can be semi-cold half-pressure type C type cabin, also can be full cold type A type storage tank or B type storage tank or film type storage tank for store liquid ammonia fuel or liquid ammonia transport medium. The liquid ammonia storage cabin is provided with a pressure sensor for monitoring the pressure change of the storage cabin in real time. The ammonia gas high-pressure collecting tank is connected with the liquid ammonia storage cabin and the ammonia gas compressor in series through a return pipeline to form a circulating pipeline, and the ammonia gas high-pressure collecting tanks are connected in parallel. Each ammonia high-pressure collecting tank is connected with the liquid ammonia storage cabin and the ammonia compressor in series to form a circulating pipeline, and the ammonia high-pressure collecting tanks are connected with the ammonia high-pressure collecting tanks in parallel. The device comprises a liquid ammonia storage cabin, a liquid ammonia fuel supply system, a liquid ammonia compressor, a liquid ammonia high-pressure collecting tank, a liquid ammonia fuel supply system, a first check valve, a first valve, a second valve and a second valve, wherein the first check valve is arranged on a return pipeline of the liquid ammonia high-pressure collecting tank from the ammonia compressor, the first valve is arranged on the return pipeline of the liquid ammonia high-pressure collecting tank to the liquid ammonia storage cabin, the liquid ammonia high-pressure collecting tank is communicated with the liquid ammonia fuel supply system through a pipeline, and the second valve is arranged on a pipeline between the liquid ammonia high-pressure collecting tank and the liquid ammonia fuel supply system. According to the invention, the ammonia gas compressor is utilized to store the evaporated ammonia gas in the liquid ammonia storage cabin into the ammonia gas high-pressure collection tank in a pressurized manner, and the maximum pressurization is up to 20barg, so that the high-pressure compression storage of the evaporated ammonia gas is realized.
In the above marine evaporated ammonia gas collecting system, further, the liquid ammonia storage cabin is communicated with the ammonia gas compressor through a gas phase pipeline.
Above-mentioned marine evaporation ammonia collecting system, further, ammonia high pressure collection tank top is provided with pressure sensor and level sensor. The pressure sensor can monitor the gas phase pressure in the ammonia high-pressure collecting tank in real time, and the liquid level sensor can monitor the liquid level height of liquid ammonia in the ammonia high-pressure collecting tank in real time.
The invention has the beneficial effects that:
1. compared with ammonia evaporation gas reliquefaction equipment, the system has the advantages of simple equipment configuration, low manufacturing cost, low operation and maintenance cost and greatly reduced power consumption.
2. The collected ammonia gas can be further used as ship fuel after being treated, and no fuel is wasted.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention with a high pressure ammonia collection tank;
FIG. 2 is a block diagram of the system of the present invention with two high pressure ammonia gas collection tanks;
wherein: the device comprises a 1-liquid ammonia storage cabin, a 2-ammonia compressor, a 3-ammonia high-pressure collecting tank, a 4-liquid ammonia fuel supply system, a 5-pressure sensor, a 6-liquid level sensor, a 7-first check valve, an 8-first valve, a 9-second valve, a 10-gas phase pipeline and an 11-backflow pipeline.
Detailed Description
The invention is further explained with reference to the drawings.
Example 1
As shown in figure 1, the evaporative ammonia gas collecting system for the ship comprises a liquid ammonia storage cabin 1 and an ammonia gas high-pressure collecting tank 3, wherein a pressure sensor 5 is arranged at the top of the liquid ammonia storage cabin and used for monitoring the pressure value inside the liquid ammonia storage cabin in real time. The top of the liquid ammonia storage cabin is connected to an ammonia compressor 2 through a gas phase pipeline 10, the ammonia compressor realizes that the evaporated gas in the liquid ammonia storage cabin is sucked and pressurized and conveyed into an ammonia high-pressure collecting tank, and the maximum pressurization is up to 20 barg. The return line 11 extends out from the ammonia compressor and is connected with the ammonia high-pressure collecting tank, then flows back to the top of the liquid ammonia storage cabin, and the liquid ammonia storage cabin, the ammonia compressor and the ammonia high-pressure collecting tank form a circulation pipeline. A first check valve 7 is arranged on a return pipeline of the ammonia gas compressor to the ammonia gas high-pressure collecting tank, and a first valve 8 is arranged on a return pipeline of the ammonia gas high-pressure collecting tank to the liquid ammonia storage cabin.
When the pressure in the liquid ammonia storage cabin rises to a set value, the marine evaporated ammonia gas collection system is started, the ammonia gas compressor and the first check valve are started, and the evaporated gas in the liquid ammonia storage cabin enters the ammonia gas high-pressure collection tank through pressurization of the compressor; and the ammonia gas compressor adjusts the output pressure of the ammonia gas compressor according to the gas phase pressure value monitored by the ammonia gas high-pressure collecting tank pressure sensor until the pressure is increased to 20barg to the maximum. If the liquid ammonia storage cabin is in a negative pressure vacuum state, the first valve is opened, and gas in the ammonia high-pressure collecting tank flows into the liquid ammonia storage cabin to supplement cabin pressure. The top of the ammonia high-pressure collecting tank is also provided with a pressure sensor and a liquid level sensor, and the gas phase pressure in the ammonia high-pressure collecting tank and the liquid level height of liquid ammonia are monitored in real time. The pressure sensor monitors the gas phase pressure in the ammonia gas high-pressure collecting tank in real time, and adjusts the output pressure of the pressure sensor until the pressure is increased to 20barg to the maximum.
The ammonia high pressure collection tank passes through tube coupling to liquid ammonia fuel supply system 4 to be provided with second valve 9 on the pipeline between ammonia high pressure collection tank and the liquid ammonia fuel supply system, through the liquid level height of liquid ammonia in the liquid level sensor real-time supervision ammonia high pressure collection tank, the ammonia liquefies into liquid and reaches certain liquid level height under high pressure state in the high pressure collection tank, can open the second valve, releases liquid ammonia and uses as ship fuel.
Example 2
As shown in figure 2, the system is provided with two ammonia high-pressure collecting tanks 3, a gas phase pipeline 10 extends out from the top of the liquid ammonia storage cabin 1 and is connected with an ammonia compressor 2, and the ammonia compressor reflows to the top of the liquid ammonia storage cabin after being respectively connected with the two ammonia high-pressure collecting tanks through a backflow pipeline 11. The liquid ammonia storage cabin is connected with the ammonia compressor and the ammonia high-pressure collecting tank in series, and the two ammonia high-pressure collecting tanks are connected in parallel to form two circulating pipelines. A first check valve 7 is arranged on a return pipeline leading from the ammonia gas compressor to the ammonia gas high-pressure collecting tank, and a first valve 8 is arranged on a return pipeline returning from the ammonia gas high-pressure collecting tank to the liquid ammonia storage cabin. The two ammonia high-pressure collecting tanks are respectively connected with the liquid ammonia fuel supply system through pipelines, and second valves 9 are arranged on the pipelines between the two ammonia high-pressure collecting tanks and the liquid ammonia fuel supply system. The top of two ammonia high pressure collecting tanks all is provided with pressure sensor 5 and level sensor 6, and two ammonia high pressure collecting tanks all can carry out real-time supervision.
The ammonia gas high-pressure collecting tank is connected with the liquid ammonia storage cabin and the ammonia gas compressor in series. High-pressure storage of ammonia boil-off gas is realized.
The evaporative ammonia gas collecting system for the ship has the advantages of simple equipment configuration, low manufacturing cost, low operation and maintenance cost and greatly reduced power consumption. The collected ammonia gas can be further used as ship fuel after being treated, so that no fuel is wasted, and the safety of ship navigation is ensured.
Claims (3)
1. The utility model provides a marine evaporation ammonia collection system, has liquid ammonia storage tank (1) with pressure sensor, its characterized in that: the device is characterized by comprising one or more ammonia high-pressure collecting tanks (3), wherein the ammonia high-pressure collecting tanks are connected with a liquid ammonia storage cabin through a return pipeline (11), an ammonia compressor (2) is connected in series to form a circulation pipeline, the ammonia high-pressure collecting tanks are connected in parallel, a first check valve (7) is arranged on a return pipeline leading the ammonia compressor to the ammonia high-pressure collecting tanks, a first valve (8) is arranged on a return pipeline leading the ammonia high-pressure collecting tanks to the liquid ammonia storage cabin, the ammonia high-pressure collecting tanks are communicated with a liquid ammonia fuel supply system through pipelines, and a second valve (9) is arranged on a pipeline between the ammonia high-pressure collecting tanks and the liquid ammonia fuel supply system.
2. The marine evaporative ammonia collection system of claim 1, wherein: the liquid ammonia storage cabin is communicated with an ammonia compressor through a gas phase pipeline (10).
3. The marine evaporative ammonia collection system of claim 1, wherein: the top of the ammonia high-pressure collecting tank is provided with a pressure sensor (5) and a liquid level sensor (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120343489.8U CN215215754U (en) | 2021-02-05 | 2021-02-05 | Marine evaporation ammonia collecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120343489.8U CN215215754U (en) | 2021-02-05 | 2021-02-05 | Marine evaporation ammonia collecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215215754U true CN215215754U (en) | 2021-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120343489.8U Active CN215215754U (en) | 2021-02-05 | 2021-02-05 | Marine evaporation ammonia collecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215215754U (en) |
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2021
- 2021-02-05 CN CN202120343489.8U patent/CN215215754U/en active Active
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