Hydrogen ammonia alcohol integrated system heat pump device

Abstract

The utility model provides a kind of heat pump device for hydrogen ammonia alcohol integrated system, waste heat recovery heat exchanger, surplus steam condensation latent heat is used as low-temperature heat source in winter;Four-way reversing valve-frequency conversion compressor-dual-function heat exchanger loop, one-key switching cold and hot mode;Energy storage buffer tank, winter exports 55~60 ℃ hot water, summer provides 7 ℃ water supply / 12 ℃ backwater.Fully overall consideration hydrogen ammonia alcohol integrated project overall design scheme, surplus steam latent heat recovery is converted into high-grade heat source, can save annual standard coal consumption;Give consideration to summer process chilled water demand, chiller can save electricity, reduce annual comprehensive energy consumption;One machine two uses, reduce equipment land occupation;Modular construction period<7 days, applicable to hydrogen, synthetic ammonia, alcohol integrated plant energy-saving reconstruction and newly-built device.

Description

Technical Field

[0001] This utility model belongs to the integrated hydrogen, ammonia, and alcohol project, and involves waste heat recovery and combined cooling and heating technology in the fields of hydrogen energy, synthetic ammonia, and alcohol production. It is a reversible heat pump coupling system that can recover the latent heat of condensation of excess steam in winter and output hot water at 55-60℃, and reverse operation in summer to provide chilled water at 7℃. Background Technology

[0002] In integrated hydrogen, ammonia, and methanol production systems, a large amount of surplus steam (0.3–0.5 MPa) is often generated in winter. Current technologies directly vent or recirculate this steam for cooling in winter, resulting in energy waste. In summer, the purification unit in the hydrogen production plant requires chilled water cooling, which usually relies on independent chiller units powered by electric chillers, leading to high operating loads and energy consumption. Currently, there is a lack of equipment that can simultaneously address waste heat recovery for heating in winter and cooling for load reduction in summer, resulting in low system energy efficiency and high operating costs.

[0003] Traditional solutions separate cooling and heating, resulting in redundant equipment, high investment, and high operating costs. Therefore, there is an urgent need for an integrated system that is simple in structure, can be used for both cooling and heating, can fully recover the latent heat of excess steam, and can reduce the load on the chiller unit. Utility Model Content

[0004] This invention proposes a multi-mode heat pump coupling system that achieves hot and cold reversal through a four-way reversing valve. In winter, surplus steam is used as a low-temperature heat source to supply hot water at 55-60°C to process or heating users. In summer, it switches to cooling mode to provide 7°C chilled water to the hydrogen production and purification system, with a return water temperature of 12°C, thereby significantly reducing the power consumption of the original chiller unit.

[0005] To achieve the above objectives, this utility model provides a heat pump device for an integrated hydrogen ammonia-ethanol system, comprising a heat pump circulation system and a water-side piping system; the heat pump circulation system is composed of an evaporator, a compressor, a four-way reversing valve, a condenser, and an expansion valve connected sequentially through refrigerant piping to form a reversible refrigerant circulation loop; the water-side piping system includes: a chilled water supply pipe, a chilled water return pipe, a waste heat recovery pipe, and a waste heat recovery pipe connected to the evaporator; and a cooling water supply pipe and a cooling water return pipe connected to the condenser.

[0006] Furthermore, the refrigerant pipeline is a closed-loop circulation pipeline, which allows the refrigerant to circulate between the evaporator, compressor, four-way reversing valve, condenser, and expansion valve.

[0007] The beneficial effects of this utility model are: in winter, the excess latent heat of steam condensation is used as a low-temperature heat source; in winter, it outputs hot water at 55-60℃ and provides 7℃ supply water / 12℃ return water in summer; it fully considers the overall design scheme of the integrated hydrogen, ammonia, and alcohol project, and converts the excess latent heat of steam into a high-grade heat source, which can save the annual standard coal consumption; it also takes into account the process chilled water demand in summer, and the chiller can save electricity and reduce the overall energy consumption throughout the year; it has two uses in one machine, reducing the equipment footprint; the modular construction cycle is less than 7 days, and it is suitable for energy-saving renovation and new construction of integrated hydrogen, synthetic ammonia, and alcohol plants. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] In the diagram: 1-Evaporator; 2-Compressor; 3-Four-way reversing valve; 4-Condenser; 5-Expansion valve; 6-Chiller water supply line; 7-Heating line; 8-Chiller water return line; 9-Waste heat recovery line; 10-Cooling water return line; 11-Cooling water supply line; 12-Waste heat recovery line. Detailed Implementation

[0010] Reference Figure 1 The system includes a heat pump circulation system and a water-side piping system. The heat pump circulation system consists of an evaporator 1, a compressor 2, a four-way reversing valve 3, a condenser 4, and an expansion valve 5 connected sequentially via refrigerant piping to form a reversible refrigerant circulation loop. The water-side piping system includes: a chilled water supply pipe 6, a chilled water return pipe 8, a waste heat recovery pipe 12, and a waste heat recovery pipe 9 connected to the evaporator 1; and a cooling water supply pipe 11 and a cooling water return pipe 10 connected to the condenser 4. The refrigerant piping is a closed-loop circulation system, allowing the refrigerant to circulate between the evaporator 1, compressor 2, four-way reversing valve 3, condenser 4, and expansion valve 5.

[0011] Winter Mode: The four-way reversing valve 3 switches the refrigerant flow direction, making the evaporator 1 the "condenser heat exchange end"; excess vapor from the hydrogen ammonia system enters the evaporator 1 through the waste heat utilization pipe 9, where it exchanges heat with the refrigerant inside the evaporator, and the refrigerant absorbs the waste heat and evaporates into a gaseous state; the gaseous refrigerant enters the compressor 2 and is compressed into a high-temperature, high-pressure gaseous state; the high-temperature, high-pressure gaseous refrigerant enters the condenser 4 and exchanges heat with the water in the heating pipe 7, where the refrigerant releases heat and condenses into a liquid state, while simultaneously heating the water to 55-60℃ (output for heating through the heating pipe); the liquid refrigerant flows back to the evaporator 1 after being throttled and depressurized by the expansion valve 5, completing the winter cycle.

[0012] The specific operating method of this device under winter conditions is as follows: the four-way reversing valve 3 switches the refrigerant flow direction; open the valves of the waste heat utilization pipeline 9 and the waste heat utilization return pipeline 12, and close the valves of the chilled water return pipeline 8 and the chilled water supply pipeline 6, so that the evaporator 1 absorbs the heat of the excess steam in the hydrogen ammonia system in the waste heat utilization pipeline 9, and the excess steam forms condensate, which is connected to the waste boiler deaerator return pipeline; open the valve of the heating pipeline 7, and close the valves of the cooling water supply pipeline 11 and the cooling water return pipeline 10, so that the condenser 4 outputs hot water at 55-60℃ to the heating pipeline 7.

[0013] Summer Mode: Control the four-way reversing valve 3 to switch the refrigerant flow direction (opposite to winter), making the condenser 4 the "evaporation heat exchange end"; the cooling water of the hydrogen ammonia alcohol system cooling system enters the condenser 4 through the cooling water supply pipe 11, and exchanges heat with the refrigerant in the condenser 4. The refrigerant absorbs heat and evaporates into a gaseous state; the gaseous refrigerant enters the compressor 2 and is compressed into a high-temperature and high-pressure gaseous state; the high-temperature and high-pressure gaseous refrigerant enters the evaporator 1 and exchanges heat with the return water from the hydrogen purification system sent by the chilled water return pipe 8. The refrigerant releases heat and condenses into a liquid state, while cooling the chilled water to 7°C (sent to the hydrogen purification system through the chilled water supply pipe 6); the return water heated to 12°C flows back to the evaporator 1 through the chilled water return pipe 8; the liquid refrigerant flows back to the condenser 4 after being throttled and depressurized by the expansion valve 5, completing the summer cycle.

[0014] The specific operating method of this device under summer conditions is as follows: the four-way reversing valve 3 switches the refrigerant flow direction; open the valves of the cooling water supply line 11 and the cooling water return line 10, and close the valve of the heating line 7, so that the condenser 4 uses the cooling water of the hydrogen ammonia system in the cooling water supply line 11 to cool the system, and then returns it to the existing cooling system; open the valves of the chilled water supply line 6 and the chilled water return line 8, and close the valves of the waste heat utilization line 9 and the waste heat utilization return line 12, so that the evaporator 1 outputs chilled water at 7°C to the chilled water supply line 6, and the return water temperature of the chilled water return line 8 is 12°C.

[0015] This invention addresses two major energy consumption issues in the integrated hydrogen, ammonia, and alcohol project system throughout the year: In winter, excess steam at 0.3–0.5 MPa is directly vented or circulated for cooling, resulting in significant waste of latent heat; in summer, the hydrogen production unit's purification unit requires 7°C chilled water, and existing electrically driven chillers consume a lot of electricity and incur high operating costs. By implementing a reversible heat pump system that achieves "steam waste heat recovery + dual heating and cooling supply," energy conservation and consumption reduction are maximized while ensuring process parameters, reducing equipment redundancy. The excess steam latent heat recovery rate is ≥92%, the chiller saves electricity in summer, and the overall annual energy efficiency COP is ≥4.5. This dual-purpose system reduces equipment footprint and lowers initial investment.

Claims

1. A heat pump device for an integrated hydroamine-ethanol system, characterized in that, It includes a heat pump circulation system and a water-side piping system; the heat pump circulation system is composed of an evaporator (1), a compressor (2), a four-way reversing valve (3), a condenser (4), and an expansion valve (5) connected in sequence through refrigerant pipelines to form a reversible refrigerant circulation loop; the water-side piping system includes: a chilled water supply pipeline (6), a chilled water return pipeline (8), a waste heat recovery pipeline (12), and a waste heat recovery pipeline (9) connected to the evaporator (1); and a cooling water supply pipeline (11) and a cooling water return pipeline (10) connected to the condenser (4).

2. The heat pump device for the integrated hydroamine-ethanol system according to claim 1, characterized in that, The refrigerant pipeline is a closed-loop pipeline, which allows the refrigerant to circulate between the evaporator (1), compressor (2), four-way reversing valve (3), condenser (4), and expansion valve (5).

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