A hydrothermal co-production and co-conveyance system

Abstract

The application discloses a hydrothermal co-production and co-transmission system. The system comprises a seawater desalination module, which is used for desalinating seawater into fresh water with different temperatures by using a thermal method seawater desalination mode, and transmitting the fresh water with different temperatures to corresponding groups of absorption heat pumps and peak heat exchangers in parallel; the absorption heat pumps and the peak heat exchangers are used for recovering waste heat of the fresh water with different temperatures and heating the fresh water at the same time, obtaining treated fresh water, and transmitting the treated fresh water to a hydrothermal separation module through a combined supply conveying pipeline; and the hydrothermal separation module is used for hydrothermal separation of the treated fresh water, and obtaining heat and water. The heating process of the system after the seawater desalination module generates fresh water with different temperatures further reduces irreversible loss of the system, improves comprehensive efficiency of the system, and further reduces heat supply cost.

Description

Technical Field

[0001] This invention relates to the field of heating technology, and more particularly to a system for the simultaneous generation and transmission of water and heat. Background Technology

[0002] With population growth and rapid urbanization, the global water shortage problem is becoming increasingly serious, especially in coastal areas. Although marine resources are abundant, usable freshwater resources are extremely limited. For example, the per capita annual water resources in my country's northern coastal provinces and cities are less than 300 cubic meters, far below the internationally recognized standard for extreme water scarcity. Meanwhile, in northern regions, winter heating is a crucial aspect of people's livelihoods. With the approaching dual-carbon goals, seeking cleaner and more efficient heating methods is imperative.

[0003] Currently, in the seawater desalination process, waste heat from power plants is recovered, and fresh water and heat are transported through a single pipeline. However, since the fresh water produced by the thermal method is often at multiple temperatures, the process of raising the temperature of fresh water at multiple temperatures is achieved through heat exchange with steam, which results in some irreversible losses. Summary of the Invention

[0004] This invention provides a water and heat co-generation and co-transmission system. By using a seawater desalination module to generate fresh water at different temperatures and then heating it, the irreversible losses of the system are further reduced, the overall efficiency is improved, and the heating cost is further reduced.

[0005] According to one aspect of the present invention, a hydrothermal co-production and co-transmission system is provided, the system comprising a seawater desalination module, an absorption heat pump, a peak heat exchanger, and a hydrothermal separation module; the seawater desalination module and the absorption heat pump are connected in parallel via a freshwater pipeline; the absorption heat pump and the peak heat exchanger are connected via a freshwater pipeline; the peak heat exchanger and the hydrothermal separation module are connected via a combined supply and delivery pipeline; wherein, one absorption heat pump and one peak heat exchanger constitute a group; multiple groups of absorption heat pumps and peak heat exchangers are connected in parallel;

[0006] The seawater desalination module is used to desalinate seawater into fresh water at different temperatures using a thermal desalination method, and to transmit the fresh water at different temperatures in parallel to the corresponding multiple sets of absorption heat pumps and peak heat exchangers.

[0007] The absorption heat pump and the peak heat exchanger are used to recover waste heat from fresh water at different temperatures while heating the fresh water to obtain treated fresh water, and then transmit the treated fresh water to the water-heat separation module through the combined supply pipeline.

[0008] The hydrothermal separation module is used to perform hydrothermal separation on the treated fresh water to obtain heat and water.

[0009] Optionally, the system further includes a power generation module; the power generation module is connected to the seawater desalination module, the absorption heat pump, and the peak heat exchanger respectively; the power generation module includes a main steam turbine and a small steam turbine;

[0010] The main steam turbine is used to obtain the main steam generated in the power plant, and the main steam enters the main steam turbine to generate electricity. The high-temperature steam extracted during the power generation process is transferred to the small steam turbine. The small steam turbine is used to adjust the parameters of the high-temperature steam extraction according to the demand parameters while generating electricity to obtain high-temperature exhaust steam. The high-temperature exhaust steam is then transferred to the seawater desalination module, the absorption heat pump, and the peak heat exchanger respectively.

[0011] Optionally, the exhaust steam generated after the main steam turbine generates electricity is transferred to the absorption heat pump for recycling.

[0012] Optionally, the seawater desalination module is specifically used to condense freshwater at different temperatures through multi-stage flash evaporation and multi-effect evaporation.

[0013] Optionally, the freshwater at different temperatures can be divided into low-temperature freshwater and high-temperature freshwater.

[0014] Optionally, the absorption heat pump is specifically used for waste heat recovery from the low-temperature freshwater; the peak heat exchanger is specifically used for heating the high-temperature freshwater.

[0015] Optionally, the system further includes a control valve group; the control valve group is used to control the opening and closing of corresponding valves according to a set time period, and to switch the corresponding operating mode of the system; wherein, the set time period includes heating period and non-heating period.

[0016] Optionally, the control valve group includes a first valve, a second valve, a third valve, and a fourth valve;

[0017] The first valve is installed on the connecting pipeline between the seawater desalination module and the absorption heat pump; the second valve is installed on the direct connecting pipeline between the seawater desalination module and the combined supply and delivery pipeline; the third valve is installed at the connection between the combined supply and delivery pipeline and the water-heat separation module; and the fourth valve is installed on the direct connecting pipeline between the combined supply and delivery pipeline and the waterworks.

[0018] Optionally, the control valve group is specifically used to open the first valve and the third valve and close the second valve and the fourth valve during the heating period; and to open the second valve and the fourth valve and close the first valve and the third valve during the non-heating period.

[0019] Optionally, the system further includes an electric heat pump; the electric heat pump is used to replace the absorption heat pump under certain set conditions.

[0020] The technical solution of this invention, through the seawater desalination module, desalinates seawater into freshwater at different temperatures using a thermal desalination method, and transmits the freshwater at different temperatures in parallel to corresponding multiple sets of absorption heat pumps and peak heat exchangers. The absorption heat pumps and peak heat exchangers recover waste heat from the freshwater at different temperatures while simultaneously heating it to obtain treated freshwater, which is then transmitted to the water-heat separation module via the combined supply and distribution pipeline. The water-heat separation module performs water-heat separation on the treated freshwater to obtain heat and water. This system, through the heating process after generating freshwater at different temperatures via the seawater desalination module, further reduces irreversible losses, improves overall system efficiency, and further reduces heating costs.

[0021] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a hydrothermal co-production and co-transport system provided in Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of a hydrothermal co-production and co-transport system provided in Embodiment 2 of the present invention;

[0025] Figure 3 This is a schematic diagram of a control valve group included in a hydrothermal co-production and co-transmission system according to Embodiment 2 of the present invention;

[0026] Figure 4 This is a schematic diagram of the operating structure of a water and heat production and transmission system during the heating season, according to Embodiment 2 of the present invention.

[0027] Figure 5 This is a schematic diagram of the operation structure of a water and heat co-production and co-transmission system during non-heating periods, according to Embodiment 2 of the present invention.

[0028] Figure 6This is a schematic diagram of a water and heat co-generation and co-transmission system that replaces a waste heat recovery device according to Embodiment 2 of the present invention. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Example 1

[0032] Figure 1 This is a schematic diagram of a hydrothermal co-production and co-transport system according to Embodiment 1 of the present invention. Figure 1 As shown, the water and heat co-production and co-transmission system includes a seawater desalination module 110, an absorption heat pump 120, a peak heat exchanger 130, and a water and heat separation module 140; the seawater desalination module 110 and the absorption heat pump 120 are connected in parallel through a freshwater pipeline 10; the absorption heat pump 120 and the peak heat exchanger 130 are connected through a freshwater pipeline 10; the peak heat exchanger 130 and the water and heat separation module 140 are connected through a combined supply and transmission pipeline 11.

[0033] In this embodiment, an absorption heat pump 120 and a peak heat exchanger 130 are grouped together; there are multiple groups of absorption heat pumps and peak heat exchangers connected in parallel.

[0034] The seawater desalination module 110 is used to desalinate seawater into fresh water at different temperatures using a thermal desalination method, and to transmit the fresh water at different temperatures in parallel to the corresponding multiple absorption heat pumps and peak heat exchangers.

[0035] Among them, the thermal seawater desalination method can refer to the process of generating water vapor and condensing it into fresh water through multi-stage flash evaporation and multi-effect evaporation. However, due to the influence of multiple stages, the parameters of each stage are different, resulting in fresh water at different temperatures.

[0036] In this embodiment, the seawater desalination module is specifically used to condense freshwater at different temperatures through multi-stage flash evaporation and multi-effect evaporation.

[0037] Specifically, in this embodiment, the seawater desalination module can obtain seawater through the seawater inlet pipe and process the seawater through multi-stage flash evaporation and multi-effect evaporation. Affected by the multi-stage process, water vapor is generated and condensed into freshwater at different temperatures. Freshwater at different temperatures will enter the corresponding absorption heat pump 120 and peak heat exchanger 130 respectively.

[0038] In this embodiment, seawater is desalinated using a seawater desalination module to obtain freshwater at different temperatures, which is then processed accordingly to facilitate different processing operations for the freshwater at different temperatures.

[0039] Absorption heat pump 120 and peak heat exchanger 130 are used to recover waste heat from fresh water at different temperatures while heating the fresh water to obtain treated fresh water, and then transmit the treated fresh water to water-heat separation module 140 through a combined supply pipeline.

[0040] The treated freshwater can be considered as freshwater that has undergone waste heat recovery and temperature heating through absorption heat pumps and peak heat exchangers. In this embodiment, freshwater at different temperatures enters multiple sets of absorption heat pumps 120 and peak heat exchangers 130 connected in parallel, respectively, to recover waste heat from the freshwater at different temperatures and raise its temperature, thereby obtaining treated freshwater. The treated freshwater is then transported to the water-heat separation module through a combined supply and distribution pipeline.

[0041] In this embodiment, freshwater at different temperatures is produced through different stages, and the process is differentiated based on the freshwater temperature. Freshwater within a specific temperature range enters a corresponding set of absorption heat pumps and a peak heat exchanger. The heating sequence is always: first, it enters the absorption heat pump, then the peak heat exchanger. This embodiment utilizes multiple sets of parallel absorption heat pumps and peak heat exchangers corresponding to different temperature ranges of freshwater.

[0042] In this embodiment, freshwater at different temperatures can optionally be divided into low-temperature freshwater and high-temperature freshwater.

[0043] In this embodiment, the low-temperature freshwater can be considered as the freshwater within the first set temperature range. For example, the first set temperature range in this embodiment can be set to 30-60℃. The high-temperature freshwater can be considered as the freshwater within the second set temperature range. For example, the second set temperature range in this embodiment can be set to 80-120℃. It is understood that the first and second set temperature ranges in this embodiment can be set according to actual needs. Furthermore, the freshwater at different temperatures in this embodiment can also be divided into temperature ranges such as low-temperature freshwater, medium-temperature freshwater, and high-temperature freshwater.

[0044] In this embodiment, optionally, an absorption heat pump is used to recover waste heat from the low-temperature freshwater; and a peak heat exchanger is used to heat the high-temperature freshwater.

[0045] In this embodiment, the absorption heat pump 120 can be used to drive a small amount of high-temperature heat source (such as steam and high-temperature hot water) to raise the thermal energy of the low-temperature freshwater to a medium temperature (such as 60-90°C), thereby recovering waste heat from the low-temperature freshwater. The peak heat exchanger 130 can be used to directly exchange heat between the freshwater and a high-temperature heat source (such as exhaust steam or steam) through a shell-and-tube structure, rapidly raising the water temperature to a target value (such as 90-150°C), thereby heating the high-temperature freshwater.

[0046] In this embodiment, the freshwater at different temperature ranges can be fed into different corresponding absorption heat pumps and peak heat exchangers for corresponding processing operations. The absorption heat pumps handle low-temperature waste heat, while the peak heat exchangers handle high-temperature demands, further recovering waste heat from exhaust steam and reducing irreversible losses.

[0047] The hydrothermal separation module 140 is used to perform hydrothermal separation on the treated fresh water to obtain heat and water.

[0048] In this embodiment, the water-heat separation module 140 can be used to separate the heat from the treated freshwater. Specifically, a heat exchanger can be used to transfer the heat in the freshwater to the clean circulating water (or heating medium), while the freshwater itself enters the water purification process, thus obtaining both heat and water. In this embodiment, the freshwater and clean circulating water are indirectly contacted through a plate or shell-and-tube heat exchanger, transferring heat from the freshwater to the circulating water, achieving "heat exchange without mixing water," thus achieving the effect of heat transfer. The separated freshwater then enters filtration, disinfection, and other treatment stages to remove impurities before being transported to a water treatment plant, thereby achieving water purification. This completes the simultaneous production, transportation, and final utilization of heat and water. In this embodiment, the water-heat separation module is used to decouple heat transfer from water purification, thereby achieving independent transportation of heat and water.

[0049] In this embodiment, fresh water at different temperatures is combined with an absorption heat pump and a peak heat exchanger, respectively. After being heated to the same temperature by the waste heat from the power generation unit, it is sent into the combined heat and power (CHP) pipeline. Finally, the heat and water are utilized separately in the terminal water-heat separation unit and the waterworks. Compared to traditional systems where water and heat are produced and transported simultaneously, this system reduces irreversible losses, further improves system efficiency, recovers more low-grade waste heat, and further improves system economics.

[0050] In this embodiment, optionally, the system further includes a power generation module; the power generation module is connected to the seawater desalination module, the absorption heat pump, and the peak heat exchanger respectively; the power generation module includes a main steam turbine and a small steam turbine; the main steam turbine is used to obtain the main steam generated in the power plant, and the main steam enters the main steam turbine to generate electricity, while the high-temperature extraction steam during the power generation process is transmitted to the small steam turbine; the small steam turbine is used to adjust the parameters of the high-temperature extraction steam according to the demand parameters while generating electricity, so as to obtain high-temperature exhaust steam; the high-temperature exhaust steam is transmitted to the seawater desalination module, the absorption heat pump, and the peak heat exchanger respectively.

[0051] Here, main steam can be steam generated by a boiler within the power plant. High-temperature extraction steam can be considered as high-temperature, high-pressure steam extracted from a specific stage of the main steam turbine during power generation. Demand parameters refer to the necessary parameters to ensure that the turbine extraction steam parameters match the hot water delivery parameters. High-temperature extraction steam parameters can refer to thermodynamic parameters; for example, high-temperature extraction steam parameters may include temperature and pressure.

[0052] In this embodiment, the power generation module can be used to provide heat for the seawater desalination module, absorption heat pump, and peak heat exchanger. Specifically, the power generation module in this embodiment processes the main steam from the boiler in the power plant into the main turbine for power generation. During power generation, the high-temperature extracted steam first enters the small turbine. While generating more power, the parameters of the high-temperature extracted steam are adjusted by the small turbine according to demand parameters, thereby reducing the exhaust steam grade to match the required level, thus obtaining the corresponding high-temperature exhaust steam. This high-temperature exhaust steam is then transmitted to the seawater desalination unit, absorption heat pump, and peak heat exchanger, respectively, to provide heat for these components.

[0053] In this embodiment, due to the mismatch between the steam extraction parameters of the steam turbine and the hot water delivery parameters, in order to reduce the irreversible losses caused by the parameter mismatch, a small steam turbine is added to further adjust the grade of the extracted steam to match the requirements.

[0054] In this embodiment, the power generation module provides heat to the seawater desalination module, absorption heat pump, and peak heat exchanger, enabling them to operate normally and improving system efficiency.

[0055] In this embodiment, optionally, the exhaust steam generated after the main steam turbine generates electricity is transferred to an absorption heat pump for recycling.

[0056] In this embodiment, the exhaust steam generated after the main turbine generates electricity enters the absorption heat pump for recycling, thus avoiding the waste of resources.

[0057] The technical solution of this invention includes a seawater desalination module for desalinating seawater into freshwater at different temperatures using a thermal desalination method. The freshwater at different temperatures is then transmitted in parallel to multiple sets of absorption heat pumps and peak heat exchangers. The absorption heat pumps and peak heat exchangers recover waste heat from the freshwater at different temperatures while simultaneously heating it to obtain treated freshwater. This treated freshwater is then transmitted to a water-heat separation module via a combined supply and distribution pipeline. The water-heat separation module performs water-heat separation on the treated freshwater to obtain heat and water. This system, through the heating process after generating freshwater at different temperatures via the seawater desalination module, further reduces irreversible losses, improves overall system efficiency, and further reduces heating costs.

[0058] Example 2

[0059] Figure 2 This is a schematic diagram of a hydrothermal co-production and co-transport system according to Embodiment 2 of the present invention. Figure 2 As shown, the combined water and heat production and transmission system includes a seawater desalination module 1, an absorption heat pump 2, a peak heat exchanger 3, a combined supply and transmission pipeline 4, a water and heat separation module 5, a waterworks 6, and a power generation module 7. The power generation module 7 consists of a main steam turbine 7.1 and a small steam turbine 7.2. Furthermore, the connecting pipelines between the modules include a seawater inlet pipeline 8, a concentrated seawater outlet pipeline 9, a freshwater pipeline 10, a first direct connection pipeline 11, and a second direct connection pipeline 12.

[0060] In this embodiment, the power generation module 7 includes a main steam turbine 7.1 and a small steam turbine 7.2. Main steam enters the main steam turbine 7.1 to generate electricity. High-temperature extracted steam from the power generation process first enters the small steam turbine 7.2, further generating electricity while reducing its exhaust steam grade to match requirements. The high-temperature exhaust steam then enters the seawater desalination module 1, the absorption heat pump 2, and the peak heat exchanger 3 to provide heat. The exhaust steam generated after power generation by the main steam turbine 7.1 is recycled by the absorption heat pump 2.

[0061] In this embodiment, the seawater desalination module 1 mainly adopts the thermal method, that is, through multi-stage flash evaporation and multi-effect evaporation, water vapor is generated and condensed into fresh water. However, due to the influence of the number of stages, fresh water at different temperatures is often produced. Fresh water at different temperatures will respectively enter the corresponding absorption heat pump 2 and the peak heat exchanger 3, recover waste heat while increasing the temperature of the fresh water, and then enter the combined supply pipeline 4, the water-heat separation module 5 and the waterworks 6 in sequence to realize the co-production, co-transportation and final utilization of heat and water. In this embodiment, the seawater desalination module 1 is condensed after multi-stage evaporation to form fresh water at different temperatures, which are connected in parallel to the multi-stage absorption heat pump 2 under corresponding working conditions to further recover the waste heat of the exhaust steam and reduce irreversible losses. Among them, the corresponding working conditions can refer to the appropriate operating parameters of the absorption heat pump for heating fresh water at different temperatures; fresh water at different temperatures is connected in parallel to the absorption heat pump 2, but 2 is the parallel situation of the absorption heat pump, Figure 2 This is a simplified expression, integrating the parallel absorption heat pumps into one component.

[0062] In this embodiment, optionally, the system further includes a control valve group; the control valve group is used to control the opening and closing of the corresponding valves according to the set time period and switch the corresponding working operation mode of the system.

[0063] Among them, the set time period includes the heating period and the non-heating period. The heating period can refer to the time period when heating is required. The non-heating period can refer to the time period when heating is not required. The control valve group in this embodiment can include multiple valves, which are set at different positions according to actual needs. The control valve group included in the system in this embodiment can control the opening and closing of different valves according to the time period in the heating season and the non-heating season, so as to switch the corresponding working mode of the system.

[0064] The system in this embodiment can also include a control valve group, so that the flow and operation of different pipelines can be controlled according to different valves, thereby realizing the switching of operation conditions at different time periods.

[0065] In this embodiment, optionally, the control valve group includes a first valve, a second valve, a third valve and a fourth valve; the first valve is arranged on the connecting pipeline between the seawater desalination module and the absorption heat pump; the second valve is arranged on the direct connecting pipeline between the seawater desalination module and the combined supply pipeline; the third valve is arranged at the connection between the combined supply pipeline and the water-heat separation module; the fourth valve is arranged on the direct connecting pipeline between the combined supply pipeline and the waterworks.

[0066] The structural schematic diagram of the water-heat co-production and co-transportation system including the control valve group in this embodiment is as Figure 3As shown, a first valve 13 is present on the pipeline connecting the seawater desalination unit 1 and the absorption heat pump 2; a second valve 14 is present on the pipeline connecting the seawater desalination unit 1 and the combined supply and distribution pipeline 4, i.e., the first direct connection pipeline 11; a third valve 15 is present at the connection between the combined supply and distribution pipeline 4 and the water-heat separation unit 5; and a fourth valve 16 is present on the direct connection pipeline between the combined supply and distribution pipeline 4 and the waterworks 6, i.e., the second direct connection pipeline 12. The system can also be equipped with other valve groups to achieve switching between different operating conditions, and valves can be added to any pipeline according to actual needs.

[0067] It should be noted that in this embodiment, the water-heat separation unit 5 does not specifically refer to two units, but rather to the possibility of multiple heat users at the terminal, thus corresponding to multiple water-heat separation units. Other equipment, such as the absorption heat pump 2 and the peak heat exchanger 3, operate in parallel for freshwater at different temperatures.

[0068] In this embodiment, by setting up different valves on different connecting pipelines, different operating modes of the system can be realized, making it more convenient for the system to operate at different times and improving the system's working efficiency.

[0069] In this embodiment, optionally, the control valve group is specifically used to open the first valve and the third valve and close the second valve and the fourth valve during the heating period; and to open the second valve and the fourth valve and close the first valve and the third valve during the non-heating period.

[0070] In this embodiment, a schematic diagram of the operation of the water and heat co-production and co-transmission system during the heating season is shown below. Figure 4 As shown, this embodiment provides a method for operating the system during the heating season, including the following steps: During the heating season, the first valve 13 and the third valve 15 are opened, and the second valve 14 and the fourth valve 16 are closed. In this embodiment, during the heating season, the system operates as follows: seawater sequentially passes through the seawater desalination unit 1, the absorption heat pump 2, the peak heat exchanger 3, the combined supply and distribution pipeline 4, and the water-heat separation unit 5 before entering the waterworks 6. The power generation unit 7 and other equipment operate normally, and heat and fresh water are simultaneously delivered to the terminal.

[0071] In this embodiment, the structural diagram of the water and heat co-production and co-transmission system during non-heating periods is shown below. Figure 5 As shown, this embodiment provides a method for operating the system during the non-heating season, including the following steps: During the non-heating season: open the second valve 14 and the fourth valve 16, and close the first valve 13 and the third valve 15. In this embodiment, during the non-heating period, the system operates as follows: seawater passes sequentially through the seawater desalination unit 1, the first direct-connection pipeline 11, the combined supply and delivery pipeline 4, and the second direct-connection pipeline 12 before being directly transported to the waterworks 6. The absorption heat pump 2, the peak heat exchanger 3, and the water-heat separation unit 5 stop operating, and freshwater is transported to the terminal.

[0072] Understandably, in this embodiment, heating and non-heating periods correspond to different operating modes. The difference lies in that only freshwater transportation is required during the non-heating season, while both heat and freshwater are transported during the heating season. In this embodiment, closing the second and fourth valves during the heating season is to prevent freshwater from flowing through their respective pipelines, thus avoiding the mixing of hot and cold water and reducing heating capacity.

[0073] In this embodiment, the system can control the opening and closing of corresponding valves according to actual needs at different times, thereby realizing flexible switching of corresponding working modes, improving the system's working efficiency, and enhancing the stability of system operation.

[0074] In this embodiment, optionally, the system also includes an electric heat pump; the electric heat pump is used to replace the absorption heat pump under certain set conditions.

[0075] The set conditions can refer to the conditions for meeting a set power generation target. In this embodiment, the set power generation target can be set according to actual needs. In this embodiment, the selection of waste heat recovery equipment can be replaced according to the actual needs of the region. In this embodiment, an electric heat pump can be used to replace the absorption heat pump in the system when the set power generation target is met. In this embodiment, for some regions with abundant power generation, there is a serious phenomenon of wind and solar power curtailment during off-peak electricity demand. By using an electric heat pump and adding relevant energy storage devices, it is possible to use the surplus electricity during off-peak hours to heat fresh water. This can effectively reduce the phenomenon of wind and solar power curtailment, reduce the system heating cost by utilizing time-of-use electricity pricing, and finally benefit the regulation of the power system.

[0076] This embodiment provides a schematic diagram of a water-heat co-production and co-transmission system for replacing waste heat recovery equipment, as shown below. Figure 6 As shown, the absorption heat pump 2 is replaced by an electric heat pump 17. In this embodiment, waste heat recovery equipment can be selected under specific circumstances. In this embodiment, the absorption heat pump 2 recovers waste heat and further heats fresh water, but can be replaced by other methods. In this embodiment, the electric heat pump 17 can directly recover waste heat from exhaust steam to heat fresh water using electricity. Simultaneously, during periods of low electricity demand, it can utilize surplus power from the grid, reducing the operating power of the power generation unit 7 and mitigating wind and solar power curtailment.

[0077] This embodiment allows for the selection of different devices in specific scenarios, enabling the system to operate year-round and flexibly determine different settings according to different regions, thus providing system adaptability.

[0078] This system not only solves the widespread water and heat shortage problems in the northern coastal areas, but also recovers waste heat from power plants, reduces investment and construction costs, and plays a key role in achieving dual carbon goals. Furthermore, through the heating process after the seawater desalination module generates freshwater at different temperatures, combined with a multi-stage heating process, it further reduces operating energy consumption. At the same time, the overall efficiency and economy of the system have been further improved, reducing irreversible losses and lowering heating costs.

[0079] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0080] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A system for simultaneous water and heat production and transportation, characterized in that, The integrated hydrothermal production and transmission system includes a seawater desalination module, an absorption heat pump, a peak heat exchanger, and a hydrothermal separation module. The seawater desalination module and the absorption heat pump are connected in parallel via a freshwater pipeline. The absorption heat pump and the peak heat exchanger are connected via a freshwater pipeline. The peak heat exchanger and the hydrothermal separation module are connected via a combined power supply pipeline. One absorption heat pump and one peak heat exchanger constitute a group; multiple groups of absorption heat pumps and peak heat exchangers may be connected in parallel. The seawater desalination module is used to desalinate seawater into fresh water at different temperatures using a thermal desalination method, and to transmit the fresh water at different temperatures in parallel to the corresponding multiple sets of absorption heat pumps and peak heat exchangers. The absorption heat pump and the peak heat exchanger are used to recover waste heat from fresh water at different temperatures while heating the fresh water to obtain treated fresh water, and then transmit the treated fresh water to the water-heat separation module through the combined supply pipeline. The hydrothermal separation module is used to perform hydrothermal separation on the treated fresh water to obtain heat and water.

2. The system according to claim 1, characterized in that, The system also includes a power generation module; the power generation module is connected to the seawater desalination module, the absorption heat pump, and the peak heat exchanger respectively; the power generation module includes a main steam turbine and a small steam turbine; The main steam turbine is used to obtain the main steam generated in the power plant, and the main steam enters the main steam turbine to generate electricity. The high-temperature steam extracted during the power generation process is transferred to the small steam turbine. The small steam turbine is used to adjust the parameters of the high-temperature steam extraction according to the demand parameters while generating electricity to obtain high-temperature exhaust steam. The high-temperature exhaust steam is then transferred to the seawater desalination module, the absorption heat pump, and the peak heat exchanger respectively.

3. The system according to claim 2, characterized in that, The exhaust steam generated after the main steam turbine generates electricity is transferred to the absorption heat pump for recycling.

4. The system according to claim 1, characterized in that, The seawater desalination module is specifically used to condense freshwater at different temperatures through multi-stage flash evaporation and multi-effect evaporation.

5. The system according to claim 1, characterized in that, Freshwater at different temperatures can be divided into low-temperature freshwater and high-temperature freshwater.

6. The system according to claim 5, characterized in that, The absorption heat pump is specifically used for waste heat recovery from low-temperature freshwater; the peak heat exchanger is specifically used for heating high-temperature freshwater.

7. The system according to claim 1, characterized in that, The system also includes a control valve group; the control valve group is used to control the opening and closing of corresponding valves according to a set time period, and to switch the corresponding operating mode of the system; wherein, the set time period includes heating period and non-heating period.

8. The system according to claim 7, characterized in that, The control valve group includes a first valve, a second valve, a third valve, and a fourth valve; The first valve is installed on the connecting pipeline between the seawater desalination module and the absorption heat pump; the second valve is installed on the direct connecting pipeline between the seawater desalination module and the combined supply and delivery pipeline; the third valve is installed at the connection between the combined supply and delivery pipeline and the water-heat separation module; and the fourth valve is installed on the direct connecting pipeline between the combined supply and delivery pipeline and the waterworks.

9. The system according to claim 8, characterized in that, The control valve group is specifically used to open the first valve and the third valve and close the second valve and the fourth valve during the heating period; and to open the second valve and the fourth valve and close the first valve and the third valve during the non-heating period.

10. The system according to claim 1, characterized in that, The system also includes an electric heat pump; the electric heat pump is used to replace the absorption heat pump under certain set conditions.

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