Ammonia working medium cyclic compression acting power generation system and water power system comprising same

Abstract

The utility model provides a novel system for efficiently carrying out heat-work conversion by using liquid ammonia / water as a circulating working medium, low-grade sensible heat can be recovered, latent heat is recovered by using an ammonia compressor to compress and heat the circulating working medium to gasify a heat source, and the heat-work or thermoelectric conversion efficiency is greatly improved. According to the utility model, the liquefied latent heat of the working medium is effectively utilized as an internal heat source for circulating gasification, so that the energy consumption and the working medium circulating quantity can be greatly reduced, greater economic and social environmental protection benefits can be created, and energy conservation and emission reduction are greatly realized.

Description

Technical Field

[0001] This utility model relates to an ammonia working fluid circulation compression power generation system and a water power system including the same. Background Technology

[0002] A combined heat and power (CHP) boiler is a device that uses fuel combustion to generate heat energy to heat steam, and then converts the high-temperature, high-pressure steam into electrical energy using a steam turbine. Analysis of the CHP boiler power generation process shows that most of the heat generated by the fuel is used for water vaporization to produce steam, which is then heated to over 485°C and 100 atmospheres of pressure. Combustion heat loss and byproducts such as steam and flue gas carry away approximately 20% of the heat, while the remaining 80% is absorbed by the steam. Steam turbine power generation only utilizes a portion of the high-temperature sensible heat (when 1 kg of steam working fluid cools from 485℃ to 185℃, it releases 1.84 × 300 = 552 kJ of heat that can do work; the latent heat of vaporization of water at 100℃ is 2260 kJ / kg; when 1 kg of steam heats up from 100℃ to 185℃, it absorbs 184 kJ / kg of heat; the specific heat capacity of steam is 1.84 kJ / kg•K). The unutilized latent heat of steam and the sensible heat from the 180℃ temperature rise total 2444 kJ / kg. Therefore, the actual sensible heat of steam is only 552 kJ / hour, and its conversion efficiency into electrical energy accounts for only 18% of the total heat obtained by the steam (2996 kJ), approximately half of the thermoelectric conversion efficiency. The other half of the work is the work done by the steam through the Rankine cycle, i.e., the decrease in pressure and increase in volume (entropy increase).

[0003] It is evident that in power plants, the steam turbine generates electricity, but the boiler flue gas and steam carry away a significant amount of low- to medium-grade sensible heat, and the latent heat of liquefaction of the steam is also wasted during cooling. This portion of energy becomes ineffective energy in the thermoelectric conversion process. A 130-ton / hour thermal power boiler typically has a combustion heat output of around 30 million joules / hour, a steam heat output of around 25 million kilocalories / hour, and an electrical energy output of around 10 million kilowatt-hours / hour.

[0004] In summary, thermoelectric conversion efficiency refers to the efficiency of converting heat energy into electrical energy. The thermoelectric efficiency of ordinary coal-fired power generating units is only about one-third because steam turbines only utilize a portion of the high-temperature sensible heat and expansion work. A large amount of low- and medium-grade sensible heat is carried away by flue gas and steam. In particular, the latent heat of liquefaction of the circulating working fluid, steam, is wasted through cooling towers or air-cooled towers, and the cooling process also consumes a significant amount of water and energy. Therefore, the potential for developing technologies to recover and utilize waste heat and innovating processes to improve thermoelectric conversion efficiency is enormous.

[0005] Appendix Figure 1The Rankine cycle shown refers to an ideal cycle process using water vapor as the working fluid, which mainly includes the following four indispensable processes: 1) isentropic compression, 2) isobaric heating, 3) isentropic expansion, and 4) isobaric condensation.

[0006] A heat pump is a device system that can convert low-temperature heat energy into high-temperature heat energy. Its principle is based on the thermodynamic cycle principle. By inputting external energy (such as electrical energy), low-temperature heat energy is extracted from a low-temperature source and released into a high-temperature source to achieve the effect of raising the temperature.

[0007] The working process of a heat pump can be divided into four steps: evaporation, compression, condensation, and expansion.

[0008] First, in the evaporator, the solvent absorbs heat from the heat source, evaporating into low-temperature vapor, which absorbs thermal energy from the low-temperature heat source (such as low-grade heat in industry, geothermal energy, air, or circulating water). Then, the low-temperature vapor is compressed by the compressor, the core power unit of the heat pump, increasing both its temperature and pressure simultaneously; this process requires a small amount of external energy (such as electricity). Next, the high-temperature, high-pressure compressed gas enters the evaporator as a heat source, releasing heat to drive the continuous evaporation of the circulating solvent, which then condenses into a high-temperature liquid. Finally, the high-temperature liquid is depressurized by an expander, becoming a low-temperature, high-pressure liquid, which can be continuously pumped into the evaporator to absorb heat of vaporization, either supplied externally or provided by the liquid itself.

[0009] Heat pump systems have the following characteristics:

[0010] 1. High-efficiency energy upgrading and utilization technology: Heat pump systems can upgrade and utilize energy sources such as low-grade industrial waste heat, geothermal energy, ambient air and water, which can promote efficient energy transfer and is more energy-efficient than traditional heating methods.

[0011] 2. Simple installation and wide range of applications: Currently, heat pump systems are used in many aspects such as heating, cooling and hot water supply, and have great flexibility and adaptability.

[0012] 3. Environmental protection: The refrigerant used in heat pump systems can be liquid ammonia or water-based environmentally friendly refrigerants, which have less impact on the ozone layer.

[0013] In conclusion, heat pump systems are a highly efficient heat energy conversion technology worthy of development and expanded application. In particular, utilizing the latent heat of steam through heat pump compression is a technological route with enormous development potential, which will be valuable for heating and cooling, as well as heat-power and thermoelectric conversion. Preliminary research results indicate that a 1000 kW heat pump centrifugal compressor can compress 7 tons of steam, consuming only about one-quarter of the electrical energy gained from the steam, demonstrating relatively high energy efficiency. Therefore, by rationally designing processes, heat pump systems can be widely applied to power generation, and the utilization of industrial and transportation waste heat. Utility Model Content

[0014] Existing research indicates that using liquid ammonia instead of water as the circulating working fluid can utilize most of the sensible heat above room temperature, and the liquid ammonia / water system can significantly improve thermoelectric conversion efficiency, reducing irreversible heat loss in the evaporator and condenser. However, the thermoelectric conversion efficiency of existing ammonia or ammonia / water circulating working fluids remains low; even using 135°C hot water, the efficiency is only around 12%. Utilizing the low boiling point of ammonia as the working fluid, using low-pressure ammonia gas discharged from a steam turbine as a refrigerant can achieve combined power generation and cooling. Similarly, at an absorption temperature of 135°C and a release temperature of 7°C, the combined power generation and cooling efficiency can be increased to 22.5%. However, the utilization and matching of the cold source still face limitations imposed by application scenarios. In particular, the use of liquid ammonia or liquid ammonia / water circulating working fluids to replace water suffers from the same unresolved constraint affecting thermoelectric efficiency improvement—the latent heat of liquefaction of the working fluid is carried away by the cooling medium and cannot be utilized.

[0015] Therefore, the key to overcoming the technical bottleneck of low heat-to-power or heat-to-work conversion efficiency in cogeneration lies in fully utilizing the latent heat of liquefaction of the working fluid as the internal heat source for its vaporization.

[0016] Ammonia is a commonly used low-toxicity chemical. Liquid ammonia has a boiling point of -33.5℃, which is 133.5℃ lower than water. If liquid ammonia is used instead of water as the working medium, the boiling temperature can be lowered by 133.5℃, allowing for the conversion of low-grade heat energy into usable pressure energy using a medium-low temperature heat source to vaporize the liquid ammonia. The latent heat of vaporization of liquid ammonia is 1374 KJ / kg, only 60% of that of the same mass of water. This means that the same amount of heat energy can vaporize ammonia into 1.65 times the volume of water vapor, making it more conducive to expansion and work. The maximum permissible concentration of ammonia in air is 30 mg / m³. 3 Concentration exceeding 360 mg / m³ 3 It may cause an explosion. Ammonia has an auto-ignition point of 651℃, making it relatively safe; its density at room temperature and saturated vapor pressure is 0.59 kg / m³. 3 With water vapor 0.6-0.59 kg / m 3Ammonia is readily compressible; at 20°C and 1 atmosphere, 1 volume of water can dissolve 703 volumes of ammonia gas. This property allows for water injection during compression to aid dissolution and reduce compression energy consumption. Ammonia is also easily compressible; it liquefies at 20°C under pressure of 0.871 MPa, and can be vaporized by reducing pressure and increasing temperature, absorbing heat. These properties make ammonia a commonly used refrigerant in industry and it has the potential to become the preferred refrigerant for low-temperature heat sources in heat-work or thermoelectric conversion. Consulting the pressure table for liquid ammonia at different temperatures, we find that the saturated vapor pressure of liquid ammonia is 0.1 MPa at -33.5℃; 0.4244 MPa at 0℃; 0.8466 MPa at 20℃; 1.152 MPa at 30℃; 1.534 MPa at 40℃; 2.006 MPa at 50℃; 2.578 MPa at 60℃; 3.264 MPa at 70℃; and [the pressure is missing from the original text]. The vapor pressure is 4.078 MPa; at 90℃, the saturated vapor pressure of liquid ammonia is 5.034 MPa; at 100℃, it is 5.151 MPa; at 110℃, it is 7.447 MPa; at 120℃, it is 8.924 MPa; and at 160℃, it is 10.669 MPa. It can be seen that the saturated vapor pressure of liquid ammonia reaches 1.152 MPa at 30℃, rises to 2.006 MPa at 50℃, and is as high as 5.15 MPa at 100℃. If the pressure of liquid ammonia after work is 0.4 MPa, the temperature will drop to around 0℃. Using an ammonia compressor at a compression ratio of 6, the pressure rises to 2.4 MPa, corresponding to a temperature of 50℃. This vaporizes to obtain ammonia gas at 2 MPa. Further heating with a high-temperature gas at constant pressure yields a high-temperature, high-pressure gas exceeding 100℃ and at 2 MPa, which can then be used for work. Clearly, by balancing and controlling pressure, temperature, and the ammonia circulation rate, it is possible to achieve the heat-to-work conversion between the low-grade sensible heat and the latent heat of the working fluid.

[0017] However, while this process demonstrates the feasibility of using a liquid ammonia / water system as a heat transfer medium instead of water, its fatal weaknesses must be overcome: First, the process fails to utilize the latent heat of vaporization of liquid ammonia, which accounts for 93% of the absorbed heat, ultimately releasing it to the low-temperature water, effectively using only the sensible heat from the 22°C temperature difference between the high and low heat sources for work. Second, an unnecessary separator is installed to separate the liquid water from the high-temperature ammonia gas, reducing the power of the working fluid. Since a significant drop in the temperature and pressure of the working fluid is conducive to condensation and absorption, 1 volume of water can absorb approximately 700 volumes of ammonia gas and significantly reduce the internal pressure. Therefore, the separator, lean ammonia solution pump, return heat exchanger, absorber, and corresponding branch lines can be eliminated, simplifying the process. Allowing the water / ammonia mixture to simultaneously enter the ammonia turbine increases the positive and negative pressure difference, improving the heat-to-work conversion efficiency.

[0018] One objective of this invention is to provide an ammonia working fluid circulating compression power generation system, comprising:

[0019] Ammonia pressure pump, primary evaporator, secondary evaporator, expander, power or electricity conversion device;

[0020] Condenser, high-pressure liquid ammonia pump, chilled water pump or air cooler;

[0021] In the primary evaporator, the heat source for the vaporization of part of the ammonia / water mixture into the secondary evaporator comes from the condensation heat of the ammonia / water vapor working medium after compression and expansion by the ammonia pressure pump. In the secondary evaporator, the heat source for further vaporization and temperature increase of the circulating ammonia is the hot water or hot air entering the secondary evaporator via a pump or fan. The source of work done by the expander or direct power generation is the high-temperature and high-pressure ammonia gas that enters after secondary heating. The energy consumption of the ammonia pressure pump is guaranteed by a portion of the generated kinetic energy, and the source of the electricity output is the remaining portion of the generated kinetic energy.

[0022] The heat source for the vaporized liquid ammonia circulating into the first-stage evaporator comes from the low-temperature, low-pressure ammonia gas after being pressurized and heated by an ammonia pressure pump to do work and then cooled. The liquid ammonia in the heat exchanger is heated by its partial vaporization. The second-stage evaporator is a device that allows the incoming ammonia gas to absorb heat and be further heated. The work done by the expander or the direct power generation source is the inflow of the generated high-temperature, high-pressure ammonia gas.

[0023] The primary evaporator is a device for fully exchanging heat with the pressurized heat circulation material. The condenser, which is cooled by heated cold water or cold air, is a device for completely condensing the pressurized heat circulation material that has undergone sufficient heat exchange into a liquid ammonia / water mixture. The primary evaporator is a device that uses a liquid ammonia pump to quantitatively inject the above mixture, thereby realizing the complete internal circulation of the working fluid and the conversion of absorbed energy.

[0024] Another objective of this invention is to provide an ammonia working fluid circulating compression power generation system, including...

[0025] Ammonia pressure pump, primary evaporator, secondary evaporator, expander, power or electricity conversion device;

[0026] Condenser, high-pressure liquid ammonia pump, chilled water pump or air cooler;

[0027] The heat source for the vaporization of part of the ammonia / water mixture in the first-stage evaporator is the hot water or hot gas that enters the first-stage evaporator via a pump or fan. The vaporization of part of the ammonia / water mixture in the evaporator is due to further heating in the second-stage evaporator. The work done by the expander or the direct power generation is due to the high-temperature and high-pressure ammonia gas that enters after secondary heating. The energy consumption of the ammonia compressor is guaranteed by a portion of the kinetic energy generated, and the source of the output in the form of electricity is the remaining portion of the kinetic energy generated.

[0028] The heat source for vaporizing liquid ammonia comes from the low-temperature, low-pressure ammonia gas that has been pressurized and heated by an ammonia pressure pump and cooled after doing work in the secondary evaporator. The heat source is also the heat source for further vaporization and temperature increase of the circulating liquid ammonia working fluid.

[0029] The primary evaporator is a device for fully exchanging heat with the pressurized heat circulation material. The condenser, which is cooled by heated cold water or cold air, is a device for completely condensing the pressurized heat circulation material that has undergone sufficient heat exchange into a liquid ammonia / water mixture. The primary evaporator is a device that uses a liquid ammonia pump to quantitatively inject the above mixture, thereby realizing the complete internal circulation of the working fluid and the conversion of absorbed energy.

[0030] Preferably, the heat source for the primary evaporator is ambient temperature seawater, lake water, or river water pumped in by a water pump, which causes part of the ammonia / water mixture to vaporize and enter the secondary evaporator; the work done by the expander or the direct power generation is from the high temperature and high pressure ammonia gas that enters after secondary heating; the energy consumption of the ammonia pressure pump is guaranteed by a portion of the generated kinetic energy, and the source of the electricity output is the remaining portion of the generated kinetic energy.

[0031] The heat source for vaporizing liquid ammonia comes from the low-temperature, low-pressure ammonia gas that has been pressurized and heated by an ammonia pressure pump and cooled after doing work in the secondary evaporator. The heat source is also the heat source for further vaporization and temperature increase of the circulating liquid ammonia working fluid.

[0032] The condenser is a device that condenses pressurized heat-circulating material that has released latent heat of liquefaction after being condensed by the first-stage evaporator into a crop cooling heat exchange medium that has already been heated, and then fully condenses it into a liquid ammonia / water mixture. The first-stage evaporator is a device that uses a liquid ammonia pump to quantitatively pump in the fully condensed liquid ammonia / water mixture, thereby realizing the complete internal circulation of the working fluid and the conversion of absorbed energy.

[0033] Preferably, part of the heat source for the vaporization of liquid ammonia comes from the ambient temperature seawater entering the first-stage evaporator, and the low-temperature seawater after heating is used directly as a cold source or enters the condenser.

[0034] Preferably, the hot water is selected from one or more of seawater, river water, geothermal water, waste steam, condensate, and solar hot water; the hot gas is selected from boiler exhaust gas and flue gas.

[0035] Preferably, the cold source is selected from cooling water or cold air.

[0036] Preferably, the cold source is selected from cold seawater or any other cooling medium.

[0037] Another objective of this invention is to provide a water propulsion system comprising the aforementioned system using liquid ammonia / water as the circulating working fluid, wherein the water propulsion system is capable of generating energy in water for navigation.

[0038] This invention uses liquid ammonia and water as heat transfer media, which can utilize most of the sensible heat above room temperature; the latent heat can also be utilized by compressing the ammonia with a compressor, which is of great value for heating and cooling, as well as for heat power and thermoelectric conversion.

[0039] The latent heat of vaporization of liquid ammonia is 1374 kJ / kg. 1 kg of liquid ammonia has a volume of 1318 liters under standard conditions. At 27°C, the ammonia pressure is 1 MPa, and at 5°C, it is 0.5 MPa, with a pressure difference of 0.5 MPa. Within this temperature range, the heat capacity of ammonia is 4.676 kJ / kg•°C. Based on a 22°C temperature difference, 1 kg of liquid ammonia can perform 103 kJ of work. 1 kg of liquid ammonia absorbs 1477 kJ of heat from 27°C seawater and releases 1374 kJ of latent heat into 5°C water. Even with the highest quantitative conversion cycle efficiency, it is only 7%. Currently, the utilization level is close to 2.452%. Based on the highest cycle efficiency of 7%, the thermoelectric conversion efficiency is 35%, which should be close to the normal level.

[0040] At 30℃, the saturated vapor pressure of liquid ammonia is 1.152 MPa; at 50℃, it rises to 2.006 MPa; and at 100℃, it reaches a staggering 5.15 MPa. If the pressure of the liquid ammonia after work is 0.4 MPa, the temperature drops to around 0℃. Using an ammonia compressor at a compression ratio of more than 3 times, the temperature of the compressed gas can be raised to 50℃. Ammonia gas at approximately 2 MPa acts as a heat source in the secondary evaporator, completely vaporizing most (about 90%) of the unvaporized ammonia to perform work. Clearly, by adjusting and controlling the ammonia circulation rate, pressure, temperature, and heat source quantity, this process can fully realize the heat-work conversion between low-grade sensible heat and the latent heat of the working fluid.

[0041] For the utilization of low- and medium-grade waste heat for power generation, a primary and secondary evaporator can be installed, and the heat can be introduced into an ammonia compressor to fully utilize both heat sources. Figure 3 and attached Figure 4The innovative process shown cleverly utilizes the ammonia compressor to pressurize and heat the internal circulation to the evaporator for heating. This allows for the use of both low-grade waste heat and the latent heat of ammonia liquefaction as heat sources for liquid ammonia vaporization, significantly reducing the mass of the circulating working fluid, greatly improving the heat-work conversion efficiency, and co-producing a large amount of low-temperature cold source water.

[0042] Obviously, the introduction of ammonia compressor technology and the new process of setting up dual evaporators are the biggest highlights of this invention. This invention not only makes full use of the latent heat of the working fluid, but also can smoothly convert medium and low temperature heat sources, greatly improve the heat-work conversion efficiency, and significantly reduce the circulation volume of the working fluid.

[0043] Ammonia compressors using ammonia-water mixtures as working fluids can generate electricity through a cycle and can be applied to medium- and low-temperature heat sources such as solar energy, geothermal energy, power plant waste heat, generator and engine flue gas waste heat. Attached Figure Description

[0044] Figure 1 This is a Rankine cycle diagram for a conventional water / water vapor working medium.

[0045] Figure 2 Flowchart of a seawater temperature difference power generation device using liquid ammonia / water as the working medium

[0046] Figure 3 This is a flow chart of a low-grade waste heat recovery and power generation system for liquid ammonia / water-based ammonia compressors.

[0047] Figure 4 The process of liquid ammonia / water-based seawater ammonia compressor power generation equipment Detailed Implementation

[0048] To fully illustrate the content of this utility model and better understand the value of this process, the following three embodiments are provided to aid understanding. It should be noted that the above embodiments do not encompass the entirety of the utility model, nor are they intended to limit it. Any improvement using an ammonia compressor and dual evaporators for power generation falls within the protection scope of this utility model.

[0049] Example 1: Generating electricity from low-grade waste heat

[0050] As attached Figure 3The process shown is a new process and equipment combination system that uses liquid ammonia / water as the circulating working fluid to recover low-grade sensible heat, and then uses the gaseous working fluid that is compressed, heated and expanded by an ammonia compressor to do work as its main vaporization heat source to recover latent heat, which greatly improves the efficiency of heat-work or thermoelectric conversion. The material circulation process is described as follows: the gaseous working fluid after being compressed and expanded by the ammonia compressor is used as a heat source to vaporize part of the ammonia / water mixture in the first-stage evaporator and enter the second-stage evaporator. Hot water or hot gas is then used to enter the second-stage evaporator to provide a heat source for further vaporization and temperature increase of the circulating ammonia gas. The high-temperature and high-pressure ammonia gas after secondary heating enters the expander (or ammonia turbine) to do work or directly generate electricity. The kinetic energy generated is partially used to ensure the energy consumption of the ammonia compressor, and most of the rest is output in the form of electricity. After cooling down, the low-temperature, low-pressure ammonia gas is pressurized and heated by an ammonia compressor and enters the primary evaporator as a heat source for vaporizing liquid ammonia. The liquid ammonia is partially vaporized and then enters the secondary evaporator for further heating. The resulting high-temperature, high-pressure ammonia gas enters an expander (or ammonia turbine) to perform work or generate electricity directly. The pressurized heat circulation material, after sufficient heat exchange in the primary evaporator, then enters a condenser cooled by cold water or cold air to completely condense it into a liquid ammonia / water mixture. This mixture is then pumped quantitatively into the primary evaporator using a liquid ammonia pump, thus achieving complete circulation of the working fluid and the conversion of most of the absorbed energy.

[0051] Example 2: Seawater-powered ship propulsion system

[0052] Adopting attachment Figure 4 The innovative process flow cleverly utilizes the ammonia compressor to pressurize and heat the seawater, enabling it to function as both a low-temperature and high-temperature heat source. By fully utilizing the sensible heat of seawater and the latent heat of ammonia liquefaction as the internal heat source for circulating liquid ammonia, the heat-work conversion efficiency can be significantly improved.

[0053] Appendix Figure 4This invention relates to a novel process and equipment combination for generating electricity from sensible heat in water to power waterborne navigation. The material flow is as follows: At room temperature, seawater first enters a primary evaporator, providing partial heat for the vaporization of liquid ammonia. The heated, low-temperature seawater can be used directly as a cold source or enters a condenser. The high-temperature, high-pressure gaseous ammonia, compressed by an ammonia compressor and having undergone sufficient heat exchange in a secondary high-temperature condenser, is largely condensed into ammonia / water mixture, which is then further condensed into liquid ammonia / water. The cooled water, after heat exchange, becomes medium-temperature water, which is then discharged into the water body or used as a cold source. Approximately 10% of the liquid ammonia, which has obtained energy from the room-temperature seawater in the primary evaporator, vaporizes. The resulting liquid ammonia-ammonia-water mixture enters a secondary evaporator. Hot ammonia gas at 50°C and 2MPa, pressurized and heated by an ammonia compressor, serves as a secondary heat source to further vaporize and heat the approximately 10% vaporized liquid ammonia-ammonia-water mixture. After secondary heating and sufficient vaporization, the ammonia-ammonia-water mixture at approximately 50°C and below 2MPa enters an expander for further vaporization and heating. The ammonia gas, after being cooled and depressurized by the ammonia compressor, is compressed and heated, generating a high-temperature heat source of about 50°C (20-30°C higher than seawater). This heat source then enters the secondary evaporator to circulate and heat the mixture from the primary evaporator into a pressurized liquid ammonia-ammonia-water mixture, further absorbing heat and vaporizing it. The mixture then enters the expander to generate electricity. Using an ammonia compressor fully utilizes the enormous potential of ammonia liquefaction, increasing the internal energy and work efficiency by increasing the amount of liquid ammonia vaporization and the temperature of the ammonia gas, while significantly reducing the amount of ammonia circulating and the size of the equipment. The pressurized hot material, after sufficient heat exchange, then enters the condenser with low-temperature water as the cooling medium for further condensation into a liquid ammonia / water mixture. This mixture is then pumped quantitatively into the primary evaporator by a liquid ammonia pump, completing the circulation of the working fluid and the efficient utilization of the sensible heat of the water.

[0054] Example 3: Analysis of the heat-work conversion efficiency of 1 kmol ammonia as the circulating working fluid and water as the heat source

[0055] The volume of ammonia gas at standard conditions is 22.4 cubic meters (1 kmol molecule, or 17 kg of liquid ammonia). At 2 MPa pressure, the volume is only 2.24 cubic meters, and at 0.8 MPa, it is 2.8 cubic meters. 17 kg of liquid ammonia can circulate 300 times per hour, assuming a 12-second cycle time. Based on a 0.8 MPa pressure, the hourly circulation volume of pressurized ammonia is 840 cubic meters, or 5100 kg of ammonia per hour. Assuming the heat absorption during the vaporization of liquid ammonia is 1500 kJ / kg, and the heat exchanger's thermal conductivity is 10000 kJ / m², this translates to a maximum volume of 22.4 cubic meters of liquid ammonia. 2•K, based on a water temperature drop of 20℃, the heat exchanger area is 765 square meters, so the equipment space is actually not large. With a calculated heat-to-work conversion efficiency of 85% (of which ammonia liquefaction contributes about 90%), the power output can reach 1806 kWh. Assuming an ammonia compressor energy consumption of 200 kWh, it can output approximately 1600 kWh of electricity per hour. Based on a water temperature drop of 20℃, the hourly water intake is 383 cubic meters, simultaneously providing low-temperature water with a 20℃ temperature reduction.

[0056] In practical applications, the water volume and circulation process quality for providing the heat source can be adjusted proportionally according to the above embodiments as needed.

Claims

1. An ammonia working fluid cycle compression power producing electrical system characterized by Comprise: ammonia pressure pump, primary evaporator, secondary evaporator, expander, power or electricity conversion device; condenser, high-pressure liquid ammonia pump, cold water pump or cold air blower; wherein the heat source of the gasification of part of the ammonia / water mixture in the primary evaporator is the condensation heat of the ammonia gas / water vapor gas working medium after compression expansion work of the ammonia pressure pump, and the heat source of the further gasification and temperature increase of the circulating ammonia gas in the secondary evaporator is the hot water or hot air entering the secondary evaporator through the pump or air blower, and the source of the work of the expander or direct power generation is the high-temperature and high-pressure ammonia gas after secondary heating, and the guarantee of the energy consumption of the ammonia pressure pump is part of the generated kinetic energy; the heat source of the gasification of the circulating liquid ammonia in the primary evaporator is the low-temperature and low-pressure ammonia gas after work of pressure increase and temperature increase by the ammonia pressure pump, the heat source of the liquid ammonia in the heat exchanger is the partial gasification, the secondary evaporator is a device for further heating and temperature increase of the entering ammonia gas, and the source of the work of the expander or direct power generation is the entering of the generated high-temperature and high-pressure ammonia gas; the primary evaporator is a device for sufficient heat exchange of the pressurized heat circulating material, the condenser cooled by the cold water or cold air after heat extraction is a device for complete condensation of the entering pressurized heat circulating material after sufficient heat exchange into liquid ammonia / water mixture, and the primary evaporator is a device for quantitative injection of the above mixture by the liquid ammonia pump.

2. An ammonia working fluid cycle compression power producing system characterized by Comprise: ammonia pressure pump, primary evaporator, secondary evaporator, expander, power or electricity conversion device; condenser, high-pressure liquid ammonia pump, cold water pump or cold air blower; wherein the heat source of the gasification of part of the ammonia / water mixture in the primary evaporator is the hot water or hot air entering the primary evaporator through the pump or air blower, the gasification of part of the ammonia / water mixture in the evaporator is due to further heating in the secondary evaporator, the source of the work of the expander or direct power generation is the high-temperature and high-pressure ammonia gas after secondary heating, and the guarantee of the energy consumption of the ammonia pressure pump is part of the generated kinetic energy; the heat source of the gasification of the circulating liquid ammonia in the secondary evaporator is the low-temperature and low-pressure ammonia gas after work of pressure increase and temperature increase by the ammonia pressure pump, and the heat source is also the heat source for further gasification and temperature increase of the circulating liquid ammonia working medium; the primary evaporator is a device for sufficient heat exchange of the pressurized heat circulating material, the condenser cooled by the cold water or cold air after heat extraction is a device for complete condensation of the entering pressurized heat circulating material after sufficient heat exchange into liquid ammonia / water mixture, and the primary evaporator is a device for quantitative injection of the above mixture by the liquid ammonia pump.

3. The ammonia working fluid cycle compression power generating system of claim 2 wherein, The heat source of the primary evaporator is the normal temperature seawater, lake water or river water sent in through the water pump, and part of the ammonia / water mixture is gasified into the secondary evaporator; the source of the work of the expander or direct power generation is the high-temperature and high-pressure ammonia gas after secondary heating, and the guarantee of the energy consumption of the ammonia pressure pump is part of the generated kinetic energy; the heat source of the gasification of the circulating liquid ammonia in the secondary evaporator is the low-temperature and low-pressure ammonia gas after work of pressure increase and temperature increase by the ammonia pressure pump, and the heat source is also the heat source for further gasification and temperature increase of the circulating liquid ammonia working medium; The condenser is a device for condensing the pressurized heat cycle material releasing latent heat of liquefaction into the already heated cold water or cold air cooling heat exchange medium and making it fully condensed into liquid ammonia / water mixture. The first evaporator is a device for fully condensing liquid ammonia / water mixture by using a liquid ammonia pump to quantitatively pour in.

4. The ammonia working fluid cycle compression power generation system of claim 2, wherein, Part of the heat source for ammonia gasification comes from normal temperature seawater entering the first evaporator. The low temperature seawater after heat supply is directly used as a cold source or enters the condenser.

5. A waterborne power system characterized by An ammonia working fluid cycle compression power generation system comprising the ammonia working fluid cycle of claim 3.

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