Differential pressure power generation and heat energy comprehensive utilization system

Abstract

The invention discloses a differential pressure power generation and heat energy comprehensive utilization system, and relates to the technical field of energy comprehensive utilization, the differential pressure power generation and heat energy comprehensive utilization system comprises a differential pressure power generation unit comprising an expansion machine, an outlet of the expansion machine is communicated with a cold source inlet of an ice making unit, and the ice making unit makes ice by using cold energy of an expanded low-temperature power generation medium; a cold source outlet of the ice making unit converges into a downstream pipe network; an intermediate medium circulates in the intermediate circulation device; a heat energy utilization device is arranged in the heat energy utilization device; the heat energy utilization device is used for heating the intermediate medium by using a renewable heat source or waste heat, the heated intermediate medium enters a heat source inlet of the ice making unit, and the ice making unit is used for melting ice by using heat of the heated intermediate medium. The system solves the problems of low system efficiency and low energy utilization rate when an energy power generation system is combined with an ice making process in the prior art, and has the advantages of high system efficiency and high energy utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive energy utilization, and in particular to a pressure difference power generation and thermal energy comprehensive utilization system. Background Art

[0002] The ice-making process not only requires a large amount of electricity and cold energy, but also requires supplementary heat when melting and demolding. The supplementary heat uses an electric heater or a similar electric heating device. Therefore, the existing ice production and ice-making process has the problem of high electricity consumption. Traditional thermal power is gradually replaced by clean sources, and differential pressure power generation is one of the new power generation methods that utilizes clean energy. However, when the clean energy power generation system is currently combined with the ice-making process, there are problems with low system efficiency and low energy utilization. Summary of the invention

[0003] The object of the present invention is to provide a pressure difference power generation and thermal energy comprehensive utilization system with high system efficiency and high energy utilization rate.

[0004] To achieve this purpose, on the one hand, a pressure difference power generation and heat energy comprehensive utilization system is provided, including a pressure difference power generation unit including an expander, the pressure difference power generation unit uses the pressure energy of a high-pressure power generation medium to drive a generator to generate electricity; the outlet of the expander is connected to the cold source inlet of an ice-making unit, the ice-making unit uses the cold energy of the expanded low-temperature power generation medium to make ice, and the cold source outlet of the ice-making unit merges into a downstream pipeline network; it also includes an intermediate cycle and a heat energy utilization device, an intermediate medium circulates in the intermediate cycle; the heat energy utilization device uses a renewable heat source or waste heat to heat the intermediate medium, the heated intermediate medium enters the heat source inlet of the ice-making unit, and the ice-making unit uses the calorific value of the heated intermediate medium to make ice.

[0005] Furthermore, the ice-making unit comprises at least one group of ice-making machines, and the cold source inlets of all the ice-making machines are connected to the power generation medium outlet of the expander.

[0006] Furthermore, the ice-making unit includes at least two groups of ice-making machines; and also includes a switching valve group, which is adjusted so that a part of the ice-making machines are in the ice-making process while another part of the ice-making machines are in the ice-melting process.

[0007] Furthermore, it also includes a lubricating oil heat exchanger, the hot side of the lubricating oil heat exchanger is the high-temperature lubricating oil used by the mechanical equipment, and the cold side of the lubricating oil heat exchanger is the intermediate medium; in the lubricating oil heat exchanger, after the intermediate medium and the high-temperature lubricating oil have heat exchanged, the high-temperature lubricating oil is restored to temperature, and the intermediate medium is heated.

[0008] Furthermore, the hot side inlet of the lubricating oil heat exchanger is communicated with the lubricating oil outlet of the mechanical equipment, and the hot side outlet of the lubricating oil heat exchanger is communicated with the lubricating oil station.

[0009] Furthermore, the cold side inlet of the lubricating oil heat exchanger is communicated with the heat source outlet of the ice making unit, and the cold side outlet of the lubricating oil heat exchanger is communicated with a liquid storage tank of the intermediate medium.

[0010] Furthermore, the cold side inlet of the lubricating oil heat exchanger is communicated with the heat source outlet of the ice-making unit.

[0011] Furthermore, the heat energy utilization device uses one of solar thermal energy, geothermal energy, residual heat and waste heat.

[0012] Furthermore, the thermal energy utilization device uses a solar thermal photovoltaic (PVT) module.

[0013] Furthermore, the solar thermal photovoltaic (PVT) module can utilize solar energy for heating and power generation. The generated electricity is converted into alternating current through an inverter, then boosted through a transformer, and finally connected to the high-voltage power grid.

[0014] Furthermore, the high-voltage power generation medium of the pressure difference power generation unit uses high-voltage natural gas; the power generated by the generator is first regulated by the grid-connected system for power quality, then boosted by the transformer, and finally connected to the high-voltage grid.

[0015] Furthermore, the intermediate medium may be one of ethylene glycol aqueous solution, Freon refrigerant, and organic refrigerant mixed refrigerant.

[0016] Beneficial effects: The pressure difference power generation and heat energy comprehensive utilization system of this scheme generates electricity by using the pressure difference power generation unit and makes ice by using the cold energy at the outlet of the expander. It also includes an intermediate cycle and a heat energy utilization device. An intermediate medium circulates in the intermediate cycle. The heat energy utilization device heats the intermediate medium by using a renewable heat source or waste heat. The heated intermediate medium enters the heat source inlet of the ice making unit to provide heat for the ice melting process.

[0017] This scheme deeply couples the whole process of ice making with differential pressure power generation. When making ice, the cold energy of the power generation medium at the outlet of the expander is used. When melting ice, the intermediate medium is first heated by the heat of the renewable heat source or waste heat, and then the heat of the heated intermediate medium is used to quantify the ice and demold it. Therefore, the ice making process of this scheme uses the cold energy at the outlet of the differential pressure power generation expander, and no electric energy is used in the melting process, which has the advantage of low power consumption. In addition, in some existing differential pressure power generation systems, the temperature of the power generation medium at the outlet of the expander is too low, which will also cause ice blockage in the outlet pipeline. This scheme uses this part of cold energy to make ice. After ice making, the temperature of the power generation medium rises, and the downstream pipeline through which it flows will no longer be blocked by ice. Therefore, this scheme uses the cold energy of differential pressure power generation to make ice, avoids ice blockage in the outlet pipeline of the expander, and uses renewable heat sources or waste heat to melt ice. The power consumption of the ice making and melting process is extremely low, which improves the efficiency and energy utilization of the system and realizes the cascade utilization of energy.

[0018] Furthermore, in one of the technical solutions of the above scheme, the ice-making unit includes at least two groups of ice-makers, and by adjusting the switching valve group so that one group of ice-makers is in the ice-making process while the other group of ice-makers is in the ice-melting process, the system can produce ice continuously, thereby improving the ice-making efficiency of the system and further improving energy utilization.

[0019] Furthermore, one of the technical solutions of the above scheme utilizes the high-temperature lubricating oil used by the mechanical equipment in the system to heat the intermediate medium, and then utilizes the heat of the heated intermediate medium to provide heat for the ice-melting process of the ice-making unit, further reducing the heat consumption of the heat energy utilization device during ice-melting, further improving the efficiency of the system, and realizing the comprehensive utilization of energy and the cascade utilization of energy. Furthermore, by utilizing the low-temperature intermediate medium to cool the high-temperature lubricating oil used by the mechanical equipment in the system, compared with the prior art, there is no need to set up a lubricating oil cooling water system in the system, reducing the water consumption of the system.

[0020] Furthermore, in one of the technical solutions of the above scheme, the thermal energy utilization device utilizes solar energy to generate heat and generate electricity. The generated electricity is converted into alternating current through an inverter together with the electricity produced by the pressure difference power generation unit, and then is boosted by a transformer and connected to the high-voltage power grid. The power generation of the system is significantly increased compared with the existing technology. The electricity generated by the system is used by the system itself, and the surplus electricity is connected to the grid, which further improves the efficiency and economic benefits of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flow chart of a pressure difference power generation and thermal energy comprehensive utilization system of an embodiment; Figure 2 A flow chart of another pressure difference power generation and thermal energy comprehensive utilization system of the embodiment; Figure 3 A flow chart of another pressure difference power generation and thermal energy comprehensive utilization system of the embodiment; Figure 4 A flow chart of a pressure difference power generation and thermal energy comprehensive utilization system according to another embodiment; Figure 5 A flow chart of another pressure difference power generation and thermal energy comprehensive utilization system of an embodiment.

[0022] In the figure: 1-inlet regulating valve; 2-expansion machine; 3-generator; 4-grid-connected system; 5-lubricating oil station; 6-lubricating oil heat exchanger; 71, 72, 91, 92-valves; 82-second ice maker; 81-first ice maker; 10-liquid storage tank; 11-circulating pump; 12-heat energy utilization device; 14-transformer; 15-high-voltage power grid. DETAILED DESCRIPTION

[0023] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] The pressure difference power generation and thermal energy comprehensive utilization system of this embodiment (hereinafter referred to as the comprehensive utilization system of this embodiment) includes a pressure difference power generation unit. Pressure difference power generation is a technology that uses the pressure energy of the power generation medium to convert it into mechanical energy, and then drives the generator to generate electricity. The principle is to introduce the power generation medium into the expander to do work, use the pressure difference energy to convert the pressure energy into mechanical energy, drive the generator to generate electricity, and output electrical energy. The existing high-pressure medium for power generation can be high-pressure natural gas, blast furnace gas, high-pressure air, and other high-pressure gases that can generate electricity.

[0025] In one implementation of this embodiment, the medium of the pressure difference power generation unit is natural gas. Natural gas, as a clean and efficient fossil energy, is a representative of the low-carbon economy. The process of using the pressure energy of high-pressure pipeline natural gas to generate electricity does not consume natural gas and will not have any impact on the environment, thus achieving zero carbonization of the entire process. Moreover, in the prior art, in natural gas pressure difference power generation, in order to avoid the natural gas temperature at the outlet of the compressor being too low after expansion, which may cause ice to form inside the pipeline and cause blockage, it is necessary to add a heat energy utilization device to the pipeline at the outlet of the expander to heat the expanded natural gas. The pressure difference power generation and comprehensive utilization of heat energy system of this embodiment not only avoids the ice blockage problem caused by the outlet low-temperature and low-pressure natural gas, but also makes full use of cold energy to generate additional benefits.

[0026] like Figure 1-Figure 5 The pressure difference power generation unit includes an inlet regulating valve, an expander, a generator, and a grid-connected system. The high-pressure power generation medium from the high-pressure pipeline network first adjusts the gas volume through the inlet regulating valve, then enters the expander through the expander inlet for expansion and pressure reduction, and drives the generator to generate electricity. The generated electricity is adjusted for power quality by the grid-connected system, and then connected to the high-voltage grid after passing through the system's transformer. The generator can be a synchronous generator or an asynchronous generator. Figure 1-Figure 5 The pipe marked with a blue outlet at the middle expander 2 is filled with natural gas. In the natural gas differential pressure power generation unit, the high-pressure natural gas in the upstream high-pressure pipeline first enters the air inlet of the expander 2 through the inlet regulating valve 1, expands and reduces the pressure in the expander, drives the generator 3 to generate electricity, and the generated electricity is adjusted for power quality by the grid-connected system 4, and then boosted by the transformer 14 and connected to the high-voltage grid 15.

[0027] like Figure 1-Figure 5 The comprehensive utilization system of this embodiment includes an ice-making unit, and the power generated by the pressure difference power generation unit can power the ice-making unit. When the power generation medium uses natural gas, blast furnace gas or high-pressure air, the pressure drop of the expanded power generation medium is accompanied by a temperature drop, and it has a large cooling capacity. This embodiment uses the cooling capacity of the expanded low-temperature power generation medium to provide cooling capacity for the ice-making unit. The expanded low-temperature power generation medium enters the cold source inlet of the ice-making unit, exchanges heat with the ice-making raw materials in the ice-making unit, and uses the cold energy in the low-temperature power generation medium to make ice. After the ice-making is completed, the temperature of the low-temperature power generation medium rises, and the reheated low-temperature power generation medium enters the downstream low-pressure pipe network. The ice-making unit includes at least one group of ice-making machines, and the cold source inlets of all ice-making machines are connected to the power generation medium outlet of the expander, and the cold source outlets of all ice-making machines are connected to the downstream low-pressure pipe network. Further, the ice-making unit includes at least two groups of ice-making machines, and all ice-making machines are connected in parallel between the power generation medium outlet of the expander and the downstream pipe network according to the above connection relationship.

[0028] like Figure 1-Figure 5 The comprehensive utilization system of this embodiment is provided with an intermediate cycle and a heat energy utilization device. There is an intermediate medium in the intermediate cycle. The intermediate medium is heated by the heat energy utilization device using a renewable heat source or waste heat. The heated intermediate medium provides heat for de-icing the ice making unit. The intermediate medium can be an ethylene glycol aqueous solution, a Freon refrigerant, or an organic refrigerant mixed refrigerant composed of existing organic refrigerants. The main components of the organic refrigerant mixed refrigerant are methane, ethane, propane and / or butane, etc., with different proportions and different applicable temperatures. Figure 1-Figure 5 The red pipe is the intermediate cycle, and the intermediate medium circulates in the intermediate cycle. The intermediate cycle includes a liquid storage tank 10, a circulation pump 11, a heat energy utilization device 12, a valve 91, and a valve 92. The liquid storage tank 10 is used to store the intermediate medium. After the intermediate medium flows out of the liquid storage tank 10, it enters the heat energy utilization device 12 through the circulation pump 11, and the intermediate medium is heated in the heat energy utilization device 12 using a renewable heat source or waste heat.

[0029] like Figure 2-Figure 5 The ice-making unit of this embodiment includes at least two groups of ice-making machines, the cold source inlets of all ice-making machines are connected to the power generation medium outlet of the expansion machine, and the cold source outlets of all ice-making machines are connected to the downstream low-pressure pipe network. When the ice-making unit includes more than two groups of ice-making machines, the system also includes a switching valve group, which is adjusted to make one part of the ice-making machines in the ice-making process while the other part of the ice-making machines is in the ice-melting process, and ice-making and ice-melting are performed alternately to improve ice-discharging efficiency. Figure 1 An embodiment with two groups of ice makers is shown, namely a first ice maker 81 and a second ice maker 82. When an ice maker is added, it is either connected in the same manner as the first ice maker 81 or in the same manner as the second ice maker 82.

[0030] One structure of the switching valve group is: a control valve is provided at the cold source inlet and the heat source inlet of each ice maker respectively. The ice maker is controlled to refrigerate by opening the control valve at the cold source inlet of the ice maker, and the ice maker is controlled to defrost by opening the control valve at the heat source inlet of the ice maker. The central controller controls a part of the ice makers to be in the ice making state and another part of the ice makers to be in the defrosting state by controlling the above control valves. By setting the switching valve group, during large-scale ice making, the cold energy is concentrated in a part of the ice makers to increase the ice making speed, and the heat energy is concentrated in another part of the ice makers to increase the defrosting speed. In summary, the ice production speed of the system is increased and the ice production amount of the system is increased.

[0031] like Figure 2-Figure 5 An implementation method of the switching valve group is shown. A control valve 71 is provided on the cold source inlet pipeline of the first ice maker 81, a control valve 91 is provided on the heat source inlet pipeline of the first ice maker 81, a control valve 72 is provided on the cold source inlet pipeline of the second ice maker 82, and a control valve 92 is provided on the heat source inlet pipeline of the second ice maker 82. The switching process of the switching valve group is: open valve 71, close valve 91, and the first ice maker 81 refrigerates and makes ice. After the first ice maker 81 completes ice making, close valve 71, open valve 91, and the first ice maker 81 starts to defrost. At the same time, open valve 72, close valve 92, and the second ice maker 82 starts to make ice. After the first ice maker 81 completes defrosting, open valve 71, close valve 91, and the first ice maker 81 refrigerates and makes ice. After the second ice maker 82 completes ice making, open valve 92, close valve 72, and the second ice maker defrosts. The above process is repeated so that the first ice maker 81 and the second ice maker 82 make ice and defrost alternately.

[0032] like Figure 2-Figure 3 and Figure 5 The system of this embodiment also includes a lubricating oil unit, which includes a lubricating oil station and a lubricating oil heat exchanger. The inlet of the lubricating oil station is connected to the oil outlet of the mechanical equipment using lubricating oil in the system, the outlet of the lubricating oil station is connected to the hot side inlet of the lubricating oil heat exchanger, and the hot side outlet of the lubricating oil heat exchanger is connected to the oil return port of the mechanical equipment; the cold side of the lubricating oil heat exchanger is the intermediate medium. In the lubricating oil heat exchanger, after the intermediate medium exchanges heat with the high-temperature lubricating oil, the high-temperature lubricating oil is reheated and the intermediate medium is heated. The intermediate medium can also be used to reheat the lubricating oil. Figure 2-Figure 3 and Figure 5 , the green pipe is the circulation of the lubricating oil unit, and the lubricating oil circulates in this circulation. The lubricating oil unit includes a lubricating oil station 5 and a lubricating oil heat exchanger 6. The oil outlet of the expander is connected to the inlet of the lubricating oil station, and the high-temperature lubricating oil after use of the expander is introduced into the lubricating oil station. The outlet of the lubricating oil station is connected to the hot side inlet of the lubricating oil heat exchanger 6.

[0033] like Figure 2-Figure 3 and Figure 5 The cold side inlet of the lubricating oil heat exchanger is connected to the heat source outlet of the ice-making unit, and the intermediate medium after the ice-making unit is used can still be used to reheat the lubricating oil. The cold side inlet of the lubricating oil heat exchanger is connected to the heat source outlet of the ice-making unit, and the cold side outlet of the lubricating oil heat exchanger is connected to the liquid storage tank. The lubricating oil heat exchanger is connected in series to the intermediate cycle, and the temperature of the intermediate medium after the ice-making unit is used can still be used to reheat the lubricating oil. The cold side outlet of the lubricating oil heat exchanger is connected to the liquid storage tank of the intermediate medium, and the intermediate medium is heated by the waste heat of the high-temperature lubricating oil used by the mechanical equipment in the system. The heated intermediate medium enters the liquid storage tank for storage, which increases the temperature of the intermediate medium in the liquid storage tank. When the ice-making unit needs heat to melt ice, the intermediate medium in the liquid storage tank enters the heat energy utilization device for heating, and the heat of the heated intermediate medium provides heat for the ice-melting process of the ice-making unit. It can be seen that the time for the intermediate medium passing through the lubricating oil heat exchanger to further heat up in the heat energy utilization device is shortened, and the efficiency is improved, which further reduces the energy consumption of the ice-melting process, improves the efficiency of the system, and realizes the comprehensive utilization of energy and the cascade utilization of energy.

[0034] The heat utilization device uses solar thermal energy, geothermal energy, waste heat, and waste heat. When using solar thermal energy, the heat utilization device includes a solar heat absorbing plate and a heat exchanger, one side of the heat exchanger is an intermediate medium, and the other side of the heat exchanger is the heat absorbed by the solar heat absorbing plate. It is natural heat extracted from the earth's crust, usually in the form of geothermal water. When using geothermal energy, the heat utilization device includes a heat exchanger, one side of the heat exchanger is an intermediate medium, and the other side of the heat exchanger is geothermal water. There are many ways to recycle waste heat, such as flue exhaust of boilers and industrial kilns, boiler sewage heat, deaerator exhaust, and steam seal exhaust. When using waste heat, the heat utilization device can use an existing waste heat recovery heat exchanger. Waste heat refers to the heat energy that is no longer used after the production and manufacturing heat is discharged after the utilization is completed. The heat of lubricating oil recovered by the lubricating oil heat exchanger also belongs to waste heat utilization. In addition, for industries with large industrial waste heat emissions, such as cement, steel, thermal power, ceramics, non-ferrous metals, etc., the heat energy utilization devices can also use existing waste heat recovery heat exchangers.

[0035] Furthermore, if Figure 4-Figure 5The thermal energy utilization device uses a solar thermal photovoltaic PVT module. The solar thermal photovoltaic PVT module can use solar energy for heating and power generation. The generated electricity is converted into AC power through an inverter, and then boosted by a transformer and connected to the high-voltage power grid. The differential pressure power generation is first regulated by the grid-connected system before being connected to the grid. The electricity generated by the solar thermal photovoltaic PVT module is first converted into AC power through an inverter, and then boosted by a transformer and connected to the grid together with the electricity generated by the differential pressure power generation system. The thermal energy utilization device 12 uses a solar thermal photovoltaic PVT module, which can also use solar energy to generate electricity. The electricity generated is converted into AC power through an inverter 13, and then boosted by a transformer 14 and connected to the high-voltage power grid 14. The electricity generated by the solar thermal photovoltaic PVT module 12 and the differential pressure power generation unit can be first supplied to the electrical equipment in the system for their own use, and the surplus electricity can be connected to the grid.

[0036] This scheme deeply couples the whole process of ice making with differential pressure power generation. When making ice, the cold energy of the power generation medium at the outlet of the expander is used. When melting ice, the intermediate medium is first heated by the heat of the renewable heat source or waste heat, and then the heat of the heated intermediate medium is used to quantify the ice and demold it. Therefore, the ice making process of this scheme uses the cold energy at the outlet of the differential pressure power generation expander, and no electric energy is used in the melting process, which has the advantage of low power consumption. In addition, in some existing differential pressure power generation systems, the temperature of the power generation medium at the outlet of the expander is too low, which will also cause ice blockage in the outlet pipeline. This scheme uses this part of cold energy to make ice. After ice making, the temperature of the power generation medium rises, and the downstream pipeline through which it flows will no longer be blocked by ice. Therefore, this scheme uses the cold energy of differential pressure power generation to make ice, avoids ice blockage in the outlet pipeline of the expander, and uses renewable heat sources or waste heat to melt ice. The power consumption of the ice making and melting process is extremely low, which improves the efficiency and energy utilization of the system and realizes the cascade utilization of energy.

[0037] Furthermore, the ice-making unit includes at least two groups of ice-makers, and by adjusting the switching valve group so that one group of ice-makers is in the ice-making process while the other group of ice-makers is in the ice-melting process, the system can produce ice continuously, thereby improving the ice-making efficiency of the system and further improving energy utilization.

[0038] Furthermore, the high-temperature lubricating oil used by the mechanical equipment in the system is used to heat the intermediate medium, and the heat of the heated intermediate medium is then used to provide heat for the ice-melting process of the ice-making unit, which further reduces the heat consumption of the heat energy utilization device during ice-melting, further improves the efficiency of the system, and realizes the comprehensive utilization of energy and the cascade utilization of energy. Furthermore, the high-temperature lubricating oil used by the mechanical equipment in the system is cooled by the low-temperature intermediate medium. Compared with the prior art, there is no need to set up a lubricating oil cooling water system in the system, which reduces the water consumption of the system.

[0039] Furthermore, the thermal energy utilization device uses solar energy to generate heat and generate electricity. The generated electricity is converted into alternating current through an inverter together with the electricity produced by the pressure difference power generation unit, and then is boosted by a transformer and connected to the high-voltage power grid. The power generation of the system is significantly increased compared with the existing technology. The electricity generated by the system is used by the system itself, and the surplus electricity is connected to the grid, which further improves the efficiency and economic benefits of the system.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pressure difference power generation and thermal energy comprehensive utilization system, characterized in that: The invention comprises a pressure difference power generation unit including an expander, wherein the pressure difference power generation unit utilizes the pressure energy of the high-pressure power generation medium to drive a generator to generate electricity; The outlet of the expander is connected to the cold source inlet of the ice-making unit, the ice-making unit uses the cold energy of the expanded low-temperature power generation medium to make ice, and the cold source outlet of the ice-making unit is connected to the downstream pipe network; It also includes an intermediate cycle and a heat energy utilization device, wherein an intermediate medium circulates in the intermediate cycle; the heat energy utilization device utilizes a renewable heat source or waste heat to heat the intermediate medium, and the heated intermediate medium enters the heat source inlet of the ice-making unit, and the ice-making unit utilizes the heat of the heated intermediate medium to quantify ice.

2. The pressure difference power generation and thermal energy comprehensive utilization system according to claim 1 is characterized in that: The ice-making unit comprises at least one group of ice-making machines, and the cold source inlets of all the ice-making machines are connected to the power generation medium outlet of the expander.

3. The pressure difference power generation and thermal energy comprehensive utilization system according to claim 2 is characterized in that: The ice-making unit includes at least two groups of ice-making machines; It also includes a switching valve group, which is adjusted so that a part of the ice makers are in the ice making process while another part of the ice makers are in the ice melting process.

4. The pressure difference power generation and thermal energy comprehensive utilization system according to claim 1 is characterized in that: It also includes a lubricating oil heat exchanger, the hot side of which is the high-temperature lubricating oil used by the mechanical equipment, and the cold side of which is the intermediate medium; in the lubricating oil heat exchanger, after the intermediate medium exchanges heat with the high-temperature lubricating oil, the high-temperature lubricating oil is restored to temperature, and the intermediate medium is heated.

5. The pressure difference power generation and thermal energy comprehensive utilization system according to claim 4 is characterized in that: The cold side inlet of the lubricating oil heat exchanger is in communication with the heat source outlet of the ice-making unit.

6. The pressure difference power generation and thermal energy comprehensive utilization system according to claim 1 is characterized in that: The heat energy utilization device utilizes one of solar thermal energy, geothermal energy, residual heat and waste heat.

7. The pressure difference power generation and thermal energy comprehensive utilization system according to claim 1 is characterized in that: The thermal energy utilization device uses a solar thermal photovoltaic (PVT) module.

8. The pressure difference power generation and thermal energy comprehensive utilization system according to claim 7 is characterized in that: The solar thermal photovoltaic (PVT) module can utilize solar energy for heating and power generation. The generated electricity is converted into alternating current via an inverter, then boosted via a transformer, and finally connected to a high-voltage power grid.

9. The pressure difference power generation and thermal energy comprehensive utilization system according to claim 1, characterized in that: The high-voltage power generation medium of the pressure difference power generation unit uses high-voltage natural gas; the power generated by the generator is first adjusted for power quality by the grid-connected system, then boosted by the transformer, and finally connected to the high-voltage grid.

10. The pressure difference power generation and thermal energy comprehensive utilization system according to any one of claims 1 to 9, characterized in that: The intermediate medium may be one of ethylene glycol aqueous solution, Freon refrigerant, and organic refrigerant mixed refrigerant.

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