Cooling method for hydrogen production equipment of offshore hydrogen production platform

Abstract

According to the method for cooling the hydrogen production equipment of the offshore hydrogen production platform, a plurality of air-cooled radiators are arranged on a main deck of the platform, the air-cooled radiators provide cooling fresh water for a gas-liquid processor, a refrigerating unit, a hydrogen compressor and a hydrogen adding machine and cool the gas-liquid processor, the refrigerating unit, the hydrogen compressor and the hydrogen adding machine, and the cooled fresh water flows back to the air-cooled radiators; the expansion water tank provides supplementary fresh water for the air-cooled radiator and also provides supplementary fresh water for the gas-liquid treater, the refrigerating unit, the hydrogen compressor and the hydrogenation machine. Aiming at the characteristics of offshore and shallow sea areas and a fixed hydrogen production platform, when hydrogen production equipment is cooled, required fresh water is provided through cooling of the air cooling radiator arranged on the main deck of the platform, so that the situation that seawater with poor cleanliness in the offshore and shallow sea areas flows through a plate heat exchanger to cool the fresh water to be provided is avoided; the cooling efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the field of offshore hydrogen production platform design and construction, and in particular relates to a cooling method for hydrogen production equipment on an offshore hydrogen production platform. Background Art

[0002] Green hydrogen production at sea will be increasingly used in recent years and in the future because of its advantages such as cleanliness and pollution-free. Based on the clean energy development of offshore and shallow sea wind farms, the offshore water electrolysis hydrogen production technology is adopted and combined with high-density hydrogen storage and transportation technology to supply hydrogen to users through hydrogen-powered ships, which can realize the orderly operation of marine hydrogen energy. The above-mentioned complete set of marine hydrogen energy application technology routes includes offshore hydrogen production platforms and a series of hydrogen production equipment on the platform. These hydrogen production equipment include gas-liquid processors, hydrogen purification devices, chillers, hydrogen compressors, hydrogen refueling machines, etc.

[0003] In actual applications, these hydrogen production equipment need to be cooled. The conventional cooling water system design uses a seawater cooling pump to suck seawater from the seabed valve box, which flows through a plate heat exchanger to cool the fresh water. The fresh water cooled by the plate cooler is then used to cool each hydrogen production equipment. The inventor found that for offshore ships in offshore and shallow sea areas, the cleanliness of seawater is usually very poor when the platform is in use. The inhaled seawater may contain sand or silt, which can easily cause blockage of pipelines and plate heat exchangers, affecting the use of the heat exchanger. In severe cases, the plate heat exchanger cannot work. Similar problems have also occurred in actual use. In addition, for shallow-water fixed hydrogen production platforms, the extraction of seawater is also inconvenient, and a submersible pump is required. It is also inconvenient to use and install, and the submersible pump needs to be placed in deeper seawater, so the quality of the extracted seawater will be worse. The air-cooled radiator mentioned in the present invention has fresh water as the internal medium. There is no need to use a seawater cooling pump to suck seawater from the seabed valve box to flow through the plate heat exchanger to cool the fresh water. Instead, the fresh water is cooled by the air-cooled radiator arranged on the main deck. The cooled fresh water further cools the hydrogen production equipment. The use of the air-cooled radiator can further improve the cooling efficiency, and there is no need to worry about the cleanliness of the water quality inside the radiator. At the same time, it can also further save costs overall. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a cooling method for hydrogen production equipment of an offshore hydrogen production platform for a free-fall lifeboat, and the technical solution adopted is: A method for cooling hydrogen production equipment on an offshore hydrogen production platform. A plurality of air-cooled radiators are arranged on the main deck of the platform. The air-cooled radiators provide cooling fresh water for a gas-liquid processor, a refrigeration unit, a hydrogen compressor, and a hydrogenator to cool them. The cooled fresh water flows back to the air-cooled radiators.

[0005] The expansion water tank provides supplementary fresh water for the air-cooled radiator, and also provides supplementary fresh water for the gas-liquid processor, refrigeration unit, hydrogen compressor and hydrogenator.

[0006] The above-mentioned method for cooling hydrogen production equipment of an offshore hydrogen production platform, further, the hydrogen production system includes a gas-liquid processor, a hydrogen purification device, a chiller, a hydrogen compressor, and a hydrogenator. The inlet of the gas-liquid processor is connected to the electrolyzer, and the outlet of the gas-liquid processor is connected to the hydrogen passivation device, the hydrogen compressor, the buffer gas tank, the hydrogen compressor, the hydrogen storage tank, and the hydrogenator in sequence. The hydrogenator is connected to the hydrogen-powered ship to provide hydrogen for the hydrogen-powered ship. The refrigeration unit is connected to the hydrogen passivation device through a pipeline to form a circulation pipeline.

[0007] The water filling port of the expansion water tank is connected to the air-cooled radiator, gas-liquid treatment unit, refrigeration unit, hydrogen compressor and hydrogenation machine through pipelines. The expansion water tank is connected to the gas-liquid treatment unit, refrigeration unit, hydrogen compressor and hydrogenation machine through the water filling buffer breather tank. The water outlet of the air-cooled radiator is connected to the gas-liquid treatment unit, refrigeration unit, hydrogen compressor and hydrogenation machine through pipelines, and cooling fresh water flows in the pipelines.

[0008] The fresh water used for cooling the gas-liquid processor, refrigeration unit, hydrogen compressor and hydrogenator is returned to the air-cooled radiator through a pipeline via a cooling water delivery pump, and the pipeline is connected to the return water port of the air-cooled radiator.

[0009] The above-mentioned method for cooling hydrogen production equipment of an offshore hydrogen production platform further comprises the following steps: an air-cooled radiator and an expansion water tank are arranged in an open-air area of ​​the main deck of the platform; and a gas-liquid treatment unit, a refrigeration unit, a hydrogen passivation device, a hydrogen compressor, and a hydrogenator are arranged in a mechanical room of the hydrogen production equipment under the main deck.

[0010] The above-mentioned method for cooling hydrogen production equipment on an offshore hydrogen production platform further comprises: an air-cooled radiator and an expansion water tank having a discharge port, which can be connected to a platform discharge system through a pipeline; and the expansion water tank also has a cooling water injection port, an overflow port and a low liquid level alarm switch.

[0011] The above-mentioned method for cooling hydrogen production equipment on an offshore hydrogen production platform further comprises: a temperature sensor and a pressure gauge are provided on a passage from the air-cooled radiator to the gas-liquid processor, the refrigeration unit, the hydrogen compressor, and the hydrogenator; a pressure gauge, a sampling valve, and a temperature sensor are provided in sequence on a loop from the gas-liquid processor, the refrigeration unit, the hydrogen compressor, and the hydrogenator back to the air-cooled radiator.

[0012] The above-mentioned method for cooling hydrogen production equipment on an offshore hydrogen production platform further includes providing a discharge valve at the outlet of the gas-liquid processor, the refrigeration unit, the hydrogen compressor, and the hydrogenator in a loop returning to the air-cooled radiator.

[0013] In the above-mentioned method for cooling hydrogen production equipment of an offshore hydrogen production platform, further, the expansion water tank is provided with three water supply ports, one of which is a spare water supply port.

[0014] The above-mentioned method for cooling hydrogen production equipment on an offshore hydrogen production platform further comprises the following steps: the system is provided with three air-cooled radiators, one of which is a spare air-cooled radiator.

[0015] In the above-mentioned method for cooling hydrogen production equipment on an offshore hydrogen production platform, further, there are two cooling water delivery pumps.

[0016] The above-mentioned method for cooling hydrogen production equipment on an offshore hydrogen production platform further comprises antifreeze in the cooling water.

[0017] The present invention aims at the characteristics of offshore and shallow sea areas and fixed hydrogen production platforms. When cooling the hydrogen production equipment, the required fresh water is provided by cooling the air-cooled radiator arranged on the main deck of the platform, avoiding the use of seawater with poor cleanliness in offshore and shallow sea areas to flow through a plate heat exchanger to cool the fresh water to provide seawater, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a system schematic diagram of the present invention; Among them, 1- air-cooled radiator, 2- expansion water tank, 3- gas-liquid processor, 4- chilled water unit, 5- hydrogen purification device, 6- hydrogen compressor, 7- hydrogen compressor, 8- hydrogenation machine, 9- water replenishment buffer breather tank, 10- temperature sensor, 11- pressure gauge, 12- temperature sensor, -13- pressure gauge, 14- sampling valve, 15- discharge valve, 16- cooling water delivery pump, 17- cooling water delivery pump. DETAILED DESCRIPTION

[0019] The present invention will be further described in conjunction with the accompanying drawings.

[0020] A method for cooling hydrogen production equipment on an offshore hydrogen production platform, such as Figure 1 As shown, it includes: air-cooled radiator 1, expansion water tank 2, hydrogen production equipment (hydrogen production equipment includes: gas-liquid processor 3, chiller 4, hydrogen purification device 5, hydrogen compressor 6, hydrogen compressor 7, hydrogenator 8), water replenishment buffer breather 9, temperature sensor 10, pressure gauge 11, temperature sensor 12, pressure gauge 13, sampling valve 14, water replenishment pipeline, cooling water inlet pipeline, cooling water return pipeline, cooling water delivery pump 16, cooling water delivery pump 17, and discharge pipeline. Among them, the air-cooled radiator 1 and the expansion water tank 2 are arranged in the open area of ​​the main deck of the platform to meet the anti-corrosion requirements at sea, and other hydrogen production equipment and cooling water delivery pumps are arranged in the hydrogen production equipment room under the main deck.

[0021] The air-cooled radiators 1 are provided with three units, two for use and one for backup, and each air-cooled radiator 1 is provided with a water supply port, a water outlet, a water return port and a discharge port.

[0022] The expansion water tank 2 is provided with a cooling water inlet, an overflow port, a water replenishment port, a discharge port and a low liquid level alarm switch. A certain amount of water needs to be ensured in the expansion water tank. When the liquid level is low, an alarm is sounded through the low liquid level alarm switch to replenish and ensure the water level in the expansion water tank.

[0023] The water replenishment pipeline includes a water replenishment pipeline from the expansion water tank to the air-cooled radiator, a water replenishment pipeline from the expansion water tank to the inlet of the water replenishment buffer breathable tank 9, and a water replenishment pipeline from the water replenishment buffer breathable tank 9 outlet to each hydrogen production equipment. Water replenishment needs to be given regularly according to the use of the air-cooled radiator and the hydrogen production equipment. Among them, the first water outlet of the expansion water tank 2 is connected to the water replenishment port of the air-cooled radiator 1. The second water outlet of the expansion water tank 2 is connected to the water inlet of the water replenishment buffer breathable tank 9. The water outlet of the water replenishment buffer breathable tank 9 is connected to the water replenishment port of each hydrogen production equipment. The water replenishment buffer breathable tank 9 is provided with a water inlet, three water outlets, and one water outlet is reserved.

[0024] The cooling water inlet pipeline includes the main outlet pipeline of the air-cooled radiator 1 to the cooling water inlet pipelines of each hydrogen production equipment and the temperature sensor 10 and the pressure gauge 11 on the main pipeline, wherein the main outlet pipeline of the air-cooled radiator 1 is connected to the cooling water inlet of the gas-liquid processor 3. The main outlet pipeline of the air-cooled radiator 1 is connected to the cooling water inlet of the refrigeration unit 4. The main outlet pipeline of the air-cooled radiator 1 is connected to the cooling water inlet of the hydrogen compressor 6.

[0025] The outlet main pipe of the air-cooled radiator 1 is connected to the cooling water inlet of the hydrogen compressor 7. The outlet main pipe of the air-cooled radiator 1 is connected to the cooling water inlet of the hydrogenator 8. The low-temperature water outlet of the refrigeration unit 4 is connected to the low-temperature water inlet of the hydrogen purification device 5. A temperature sensor 10 and a pressure gauge 11 are installed on the outlet main pipe of the air-cooled radiator 1. The temperature sensor is set on the water inlet main pipe to monitor the cooling water inlet temperature of each device, and the pressure gauge is set to monitor the cooling water inlet pressure.

[0026] The cooling water return pipeline includes a cooling water outlet pipeline of each hydrogen production equipment to a main pipeline of the return port of the air-cooled radiator 1 and a cooling water delivery pump 16, a cooling water delivery pump 17, a temperature sensor 12, a pressure gauge 13 and a sampling valve 14 installed on the main pipeline, wherein the cooling water outlet of the gas-liquid processor 3 is connected to the main pipeline of the return port of the air-cooled radiator 1. The cooling water outlet of the refrigeration unit 4 is connected to the main pipeline of the return port of the air-cooled radiator 1. The cooling water outlet of the hydrogen compressor 6 is connected to the main pipeline of the return port of the air-cooled radiator 1. The cooling water outlet of the hydrogen compressor 7 is connected to the main pipeline of the return port of the air-cooled radiator 1. The cooling water outlet of the hydrogenator 8 is connected to the main pipeline of the return port of the air-cooled radiator 1. The low-temperature water outlet of the hydrogen purification device 5 is connected to the low-temperature water inlet of the refrigeration unit 4. A temperature sensor 12, a pressure 13 and a sampling valve 14 are installed on the return port main pipeline of the air-cooled radiator 1. A cooling water delivery pump 16 and a cooling water delivery pump 17 are installed on the return water main pipeline of the air-cooled radiator 1. The two cooling water delivery pumps are connected in parallel and then in series to the return water main pipeline. The two cooling water delivery pumps are used one for use and the other for backup. By setting a cooling water delivery pump on the cooling water return water main pipeline, the cooling water in each cooling device can be pumped to the air-cooled radiator 1 for rapid cooling to complete the cooling water circulation. By setting a temperature sensor on the cooling water return water main pipeline to monitor the cooling water return temperature of each device, setting a pressure gauge to monitor the cooling water return pressure, and setting a sampling valve to sample and test the return water quality. If the cooling water quality does not meet the requirements, it needs to be replaced in time.

[0027] The discharge pipeline includes an expansion water tank discharge pipeline, an overflow pipeline and an air-cooled radiator discharge pipeline, wherein the expansion water tank 2 discharge pipeline, the overflow pipeline and the air-cooled radiator 1 discharge pipeline are connected to one channel and then discharged to the platform discharge system. A discharge valve 15 is provided at the lowest point of the outlet of the cooling return water pipeline of each hydrogen production equipment. The cooling water in the system needs to be replaced regularly after a certain period of use, and can be discharged through the provided discharge valve 15.

[0028] The cooling system for hydrogen production equipment of an offshore hydrogen production platform provided by the present invention comprises an air-cooled radiator 1, an expansion water tank 2, hydrogen production equipment, a water supply pipeline, a cooling water inlet pipeline, a cooling water return pipeline, and a discharge pipeline. Three air-cooled radiators are arranged and installed in the open air area on the main deck, two for use and one for backup. The hydrogen production equipment room under the main deck is arranged and installed with various hydrogen production equipment and connecting pipelines, and the air-cooled radiator is installed in the open and ventilated area of ​​the main deck. When the system is working, three air-cooled radiators are arranged on the main deck, two of which are in normal use and one is used as a backup. The cooling water in the air-cooled radiator can directly enter each hydrogen production equipment by gravity. The cooling return water of each hydrogen production equipment is transported back to the air-cooled radiator through two cooling water delivery pumps. The expansion water tank is used to replenish water for each hydrogen production equipment and cooling water pipeline. The water replenishment is done by gravity. The water replenishment buffer breathable tank 9 is installed in the hydrogen production equipment room above each equipment. The equipment is replenished with cooling water by gravity. There is a water inlet pipe above the water replenishment buffer breathable tank 9 and 3 water outlet pipes below. If only one water replenishment pipe is set to each equipment, it is easy to cause pipeline cross-flow. If each equipment is equipped with a water replenishment pipe from the expansion water tank 2, it will lead to the addition of too many pipelines, poor economy and inconvenient installation. Therefore, the above setting can completely solve the requirements of pipeline cross-flow and economy. The expansion water tank and the air-cooled radiator are provided with a discharge port, which can be discharged to the platform discharge system through a pipeline connection. Cooling fresh water is provided to each hydrogen production equipment through the air-cooled radiator to meet the cooling needs of each hydrogen production equipment. It should be noted that considering that the expansion water tank 2 and the air-cooled radiator are installed on the outdoor main deck, antifreeze is provided in the cooling water to ensure the smooth operation of the entire cooling system under low temperatures in winter.

[0029] The present invention provides a hydrogen production platform hydrogen production equipment cooling system, each hydrogen production equipment is cooled by fresh water, and the required fresh water is cooled by an air-cooled radiator arranged on the main deck of the platform, which can improve the cooling efficiency, and there is no need to set up a seawater pump and related plate coolers to cool the fresh water, and there is no need to worry about the cleanliness of the water quality inside the radiator. It is especially suitable for offshore, shallow sea areas and fixed hydrogen production platforms. It should be noted that the specific parameter requirements of the air-cooled radiator need to be set according to the specific requirements of the cooling water of each hydrogen production equipment.

Claims

1. A method for cooling hydrogen production equipment on an offshore hydrogen production platform, characterized in that: There are multiple air-cooled radiators on the main deck of the platform. The air-cooled radiators provide cooling fresh water for the gas-liquid processor, refrigeration unit, hydrogen compressor, and hydrogenation machine to cool them. The cooled fresh water flows back to the air-cooled radiators. The expansion water tank provides supplementary fresh water for the air-cooled radiator, and also provides supplementary fresh water for the gas-liquid processor, refrigeration unit, hydrogen compressor and hydrogenator.

2. A method for cooling hydrogen production equipment on an offshore hydrogen production platform according to claim 1, characterized in that: The hydrogen production system includes a gas-liquid processor, a hydrogen purification device, a chiller, a hydrogen compressor, and a hydrogenator. The inlet of the gas-liquid processor is connected to the electrolyzer, and the outlet of the gas-liquid processor is connected to the hydrogen passivation device, the hydrogen compressor, the buffer gas tank, the hydrogen compressor, the hydrogen storage tank, and the hydrogenator in sequence. The hydrogenator is connected to the hydrogen-powered ship to provide hydrogen for the hydrogen-powered ship. The refrigeration unit is connected to the hydrogen passivation device through a pipeline to form a circulation pipeline. The water replenishment port of the expansion water tank is connected to the air-cooled radiator, the gas-liquid processor, the refrigeration unit, the hydrogen compressor, and the hydrogenator through pipelines. The expansion water tank is connected to the gas-liquid processor, the refrigeration unit, the hydrogen compressor, and the hydrogenator through the water replenishment buffer breathable tank. The water outlet of the air-cooled radiator is connected to the gas-liquid processor, the refrigeration unit, the hydrogen compressor, and the hydrogenator through pipelines. Cooling fresh water flows in the pipelines. The fresh water used for cooling the gas-liquid processor, refrigeration unit, hydrogen compressor and hydrogenator is returned to the air-cooled radiator through a pipeline via a cooling water delivery pump, and the pipeline is connected to the return water port of the air-cooled radiator.

3. A method for cooling hydrogen production equipment on an offshore hydrogen production platform according to claim 2, characterized in that: The air-cooled radiator and expansion water tank are installed in the open-air area of ​​the platform's main deck, and the gas-liquid processor, refrigeration unit, hydrogen passivation device, hydrogen compressor, and hydrogenator are installed in the hydrogen production equipment machinery room under the main deck.

4. A method for cooling hydrogen production equipment on an offshore hydrogen production platform according to claim 2, characterized in that: The air-cooled radiator and the expansion water tank are provided with a drain port, which can be connected to the platform drain system through a pipeline. The expansion water tank is also provided with a cooling water injection port, an overflow port and a low liquid level alarm switch.

5. A method for cooling hydrogen production equipment on an offshore hydrogen production platform according to claim 2, characterized in that: Temperature sensors and pressure gauges are provided on the passage from the air-cooled radiator to the gas-liquid processor, refrigeration unit, hydrogen compressor and hydrogenation machine. Pressure gauges, sampling valves and temperature sensors are provided in sequence on the loop from the gas-liquid processor, refrigeration unit, hydrogen compressor and hydrogenation machine back to the air-cooled radiator.

6. A method for cooling hydrogen production equipment on an offshore hydrogen production platform according to claim 2, characterized in that: A discharge valve is provided at the outlet of the gas-liquid processor, the refrigerating unit, the hydrogen compressor and the hydrogenating machine on the return loop to the air-cooled radiator.

7. A method for cooling hydrogen production equipment on an offshore hydrogen production platform according to claim 2, characterized in that: The expansion water tank is equipped with three water filling ports, one of which is a spare water filling port.

8. A method for cooling hydrogen production equipment on an offshore hydrogen production platform according to claim 2, characterized in that: The system is equipped with three air-cooled radiators, one of which is a spare air-cooled radiator.

9. A method for cooling hydrogen production equipment on an offshore hydrogen production platform according to claim 2, characterized in that: There are two cooling water delivery pumps.

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