Hydrothermal co-production combined with trans-seasonal heat storage reservoir method for heating and water supply system

Abstract

The application discloses a heat supply and water supply system of a water-heat co-production combined cross-season heat storage reservoir method. A water-heat co-production device prepares hot fresh water at a heat source; the heat storage reservoir comprises a hot water storage part and a cold water storage part; when the temperature of the hot fresh water is lower than the boiling point, the hot fresh water enters the hot water storage part through a long single pipe; in a non-heating season, cold water in the cold water storage part is used for urban water supply; in a heating season, the heat of hot water in the hot water storage part is used for urban heat supply, and the hot water in the hot water storage part is used for urban water supply after being heated; when the temperature of the hot fresh water is higher than the boiling point, the hot fresh water enters an absorption heat exchanger through the long single pipe; in the non-heating season, the hot fresh water is used for urban water supply after being cooled, and the heat is stored in the hot water storage part; and in the heating season, the hot fresh water is used for urban water supply after being cooled, and the heat of the hot fresh water and the heat of the hot water in the hot water storage part are used for urban heat supply. The application realizes heat supply in the heating season and stable water supply throughout the year, and reduces the scale of a transmission and distribution system and the capacity of each device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy saving technology, in particular to a heat supply and water supply system of a water and heat co-production combined cross-seasonal heat storage reservoir method. BACKGROUND

[0002] China is a large country of heat supply, and with the acceleration of urbanization, the demand for heat supply in northern cities of China is growing rapidly. In 2016, the energy consumption of heat supply in northern China was equivalent to about 200 million tons of standard coal, including about 165 million tons of coal and about 27 billion cubic meters of natural gas. Among them, about 48% of the heat comes from coal or gas power plant cogeneration, 47% from coal or gas boilers, and a small part from air source or ground source heat pumps, industrial waste heat, etc. The energy utilization rate of the coal or gas boiler heating method, which accounts for 47%, is very low, and the valuable fossil fuel is only used for heating, The efficiency is much lower than that of cogeneration, so the proportion of boiler heating should be reduced and the cogeneration industry should be developed.

[0003] Traditional cogeneration is to heat long-distance heat network water by extracting steam or raising turbine back pressure, The efficiency is higher than that of coal-fired boiler heating. In 2008, Fu Lin, Jiang Yi, etc. proposed a cogeneration centralized heating method based on Co-ah cycle, which realizes "large temperature difference" long-distance heat supply by introducing absorption heat pump and absorption heat exchanger equipment. Generally speaking, the heating temperature parameter of the terminal secondary heat network water is 50 / 40℃, and the traditional cogeneration once long-distance pipe network exchanges heat with the terminal heat network through the plate heat exchanger at the city heat station, and the supply and return water parameters are 110 / 60℃. By using absorption heat pump at the power plant and absorption heat exchanger at the terminal heat station, the long-distance pipe network return water temperature can be reduced to 20℃. The reduction of long-distance pipe network return water temperature brings two significant advantages: first, the larger temperature difference makes the heating capacity per ton of water flow larger, and the pipe heat dissipation ratio will also be reduced, so the investment and operation cost of the transmission and distribution system can be reduced, or the heat supply radiation radius of the pipe network can be increased; second, the reduction of long-distance pipe network return water temperature helps to recover low-grade waste heat on the heat source power plant side and improve energy utilization rate.

[0004] On the basis of the above-mentioned combined heat and power heat supply system with absorption equipment, Tsinghua University proposed a "water and heat co-production and co-delivery" system. The conventional fresh water delivery pipeline only needs a single pipeline, and the heat supply network water pipeline needs double pipeline circulating hot water. Water and heat co-production and co-delivery refers to the direct preparation of high-temperature hot fresh water at the heat source (generally a coastal thermal power plant or a nuclear power plant), single-pipeline delivery to the urban area, and then using the absorption heat exchange equipment to exchange heat with the secondary network water to complete the "water and heat separation" to obtain normal temperature fresh water, while also heating the secondary network water. This system uses a single pipeline to complete the tasks of delivering and distributing fresh water and long-distance heat supply, and has the "large temperature difference" heat supply characteristics of the aforementioned Co-ah cycle combined heat and power, and the delivery and distribution system is highly economical. Water and heat co-production refers to the direct preparation of hot fresh water through thermal methods, and water and heat co-delivery refers to the completion of water delivery and heat supply by a single pipeline. This system has two notable advantages: first, thermal seawater desalination equipment usually produces normal temperature fresh water, but due to its structure usually having "multi-stage" or "multi-effect" characteristics, this feature allows the seawater desalination equipment to be modified to produce hot fresh water while minimizing heat exchange losses, or even be understood as "zero energy consumption water production" at the heat source first station; the second advantage is that water and heat co-delivery uses only one pipeline to achieve the tasks of water supply (single pipeline) and heat supply (double pipeline), reducing equipment investment. Water scarcity is one of the global problems that restrict human sustainable development, and China is one of the 13 water-scarce countries in the world, with per capita water resources less than one-fourth of the global average. Therefore, the water and heat co-production and co-delivery technology is worth developing to solve the problems of heat supply and water supply.

[0005] The above-mentioned water and heat co-production and co-delivery system has a disadvantage, i.e., heat supply and water supply are coupled, and the water supply varies with the heat supply. In the non-heating season, the heat supply system does not work, and the system cannot produce water. Cities only have heat supply needs in the heating season, but have water supply needs all year round, so the above-mentioned water and heat co-production and co-delivery system brings the problem of inconsistent supply and demand characteristics. In addition, the system only operates in the heating season, resulting in the annual operating hours of the seawater desalination, water and heat co-production device at the heat source side and the absorption heat exchanger equipment at the end being only 1 / 4 to 1 / 3 of the whole year, which is obviously not conducive to the economy of the system. SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to propose a water and heat co-production combined with a cross-seasonal storage reservoir method for a heat supply and water supply system, to realize heat supply in the heating season and stable water supply all year round, and to reduce the size of the delivery and distribution system and the capacity of each device.

[0007] The heat supply and water supply system of the method for water heat co-production combined with cross-seasonal heat storage reservoir according to the embodiment of the present application comprises a water heat co-production device, a long-distance single pipe, a heat storage reservoir and an absorption heat exchanger, wherein the water heat co-production device is arranged at a heat source, and the heat source is used to prepare hot fresh water with a temperature higher or lower than the boiling point from seawater; the heat storage reservoir comprises a hot water storage part and a cold water storage part, and the heat storage reservoir and the absorption heat exchanger are arranged near a city;

[0008] When the temperature of the hot fresh water is lower than the boiling point, the long-distance single pipe is used to transport the hot fresh water from the water heat co-production device to the hot water storage part; in the non-heating season, the cold water storage part is used to output cold water for city water supply; and in the heating season, the hot water output by the hot water storage part is used for city water supply after being cooled by the absorption heat exchanger with the first city heat return water, and meanwhile, the first city heat return water is heated to become the first city heat supply water after passing through the absorption heat exchanger, and is used for city heat supply.

[0009] When the temperature of the hot fresh water is higher than the boiling point, the long-distance single pipe is used to transport the hot fresh water from the water heat co-production device to the absorption heat exchanger; in the non-heating season, the hot fresh water is used for city water supply after being cooled by the absorption heat exchanger with the cold water from the cold water storage part, and meanwhile, the cold water from the cold water storage part is heated to become hot water after passing through the absorption heat exchanger, and then enters the hot water storage part; and in the heating season, the hot fresh water is used for city water supply after being cooled by the absorption heat exchanger with the second city heat return water, and meanwhile, the hot water output by the hot water storage part enters the cold water storage part after being cooled by the absorption heat exchanger with the second city heat return water, and the second city heat return water is heated to become the second city heat supply water after passing through the absorption heat exchanger, and is used for city heat supply.

[0010] The heat supply and water supply system of the water heat production combined cross-seasonal storage reservoir method has the following advantages: first, the storage reservoir decouples heat supply and water supply, so that the heat supply and water supply system of the water heat production combined cross-seasonal storage reservoir method can supply heat in the heating season and stably supply water throughout the year, which meets the demand characteristics of heat supply and water supply; second, only a single long single pipe is needed to simultaneously supply and distribute heat and fresh water, which meets the task that originally requires three pipes to complete; third, the storage reservoir evenly distributes the heat supply in the heating season to the whole year, greatly improves the annual operating hours of the distribution system and water heat production equipment, absorption heat exchangers and other equipment, reduces the size of the heat supply and water supply system of the water heat production combined cross-seasonal storage reservoir method, and further reduces the initial investment; fourth, the storage reservoir can not only undertake the task of heat supply peak regulation to ensure the safety of heat supply, but also can reduce or avoid the impact of unstable heat supply at the heat source 1, and relieve the operating pressure at the heat source. For example, when the power plant extraction steam is used as the heat source, the storage reservoir can combine the heat and electricity cooperation mode to generate more electricity and supply less heat during the power consumption peak, generate less electricity and supply more heat during the power consumption low, and finally ensure that the heat supply is equal to the total heat load in the heating season.

[0011] In some embodiments, when the temperature of the hot fresh water is below the boiling point and in the heating season, the hot water output by the hot water storage part enters the absorption heat exchanger to exchange heat with the first city heat return water, and part of the cooled water is used for city water supply, and the other part enters the cold water storage part.

[0012] In some embodiments, when the temperature of the hot fresh water is below the boiling point, the heat stored in the hot water storage part in the non-heating season and the heat of the long fresh water in the long single pipe in the heating season are just enough to supply heat to the city in the heating season, and at the end of the heating season, the hot water in the hot water storage part is cooled, completing a cycle.

[0013] In some embodiments, when the temperature of the hot fresh water is below the boiling point, the first municipal water supply pipeline, a first pipe network having a first pipe and a second pipe, and a first municipal heat supply pipeline are further included, the first municipal heat supply pipeline having a first municipal heat return pipeline and a first municipal heat supply pipeline; wherein the long-distance single pipe is connected between the water-heat co-production device and the hot water storage unit; the cold water storage unit is connected to one end of the first municipal water supply pipeline, and a municipal water supply valve is arranged on the first municipal water supply pipeline; the absorption heat exchanger is arranged on the first pipe network and the first municipal heat supply pipeline, the first pipe is located between the hot water storage unit and the absorption heat exchanger, a first valve is arranged on the first pipe, the second pipe is connected between the absorption heat exchanger and the first municipal water supply pipeline, and the connection between the second pipe and the municipal water supply pipeline is located downstream of the municipal water supply valve; and the absorption heat exchanger is located between the outlet end of the first municipal heat return pipeline and the inlet end of the first municipal heat supply pipeline.

[0014] In some embodiments, the first pipe network further has a third pipe connected between the cold water storage unit and the second pipe, and a second valve is arranged on the third pipe.

[0015] In some embodiments, when the temperature of the hot fresh water is higher than the boiling point, the heat stored in the hot water storage unit in the non-heating season and the heat of the long-distance hot fresh water of the long-distance single pipe in the heating season are just enough to be used for city heating in the heating season, at the end of the heating season, the hot water of the hot water storage unit is cooled completely, and a cycle is completed.

[0016] In some embodiments, when the temperature of the hot fresh water is higher than the boiling point, a second municipal water supply pipeline, a second pipe network, a first connecting pipeline, a second connecting pipeline and a second urban heat pipe network are further included, the second pipe network has a fourth pipeline and a fifth pipeline, the second urban heat pipe network has a second urban heat return water pipeline and a second urban heat supply water pipeline; wherein the long-distance single pipe is connected between the water-heat co-production device and the absorption heat exchanger; a third valve is arranged on the long-distance single pipe, one end of the second municipal water supply pipeline is communicated with the long-distance single pipe through the absorption heat exchanger; the absorption heat exchanger is arranged on the second pipe network and the second urban heat pipe network, the fourth pipeline is connected between the heat storage water part and the absorption heat exchanger, the fifth pipeline is connected between the cold water storage part and the absorption heat exchanger, the absorption heat exchanger is located between the outlet end of the second urban heat return water pipeline and the inlet end of the second urban heat supply water pipeline, a fourth valve is arranged on the second urban heat return water pipeline, and a fifth valve is arranged on the second urban heat supply water pipeline; one end of the first connecting pipeline is connected to the long-distance single pipe and located upstream of the third valve, the other end of the first connecting pipeline is connected to the second urban heat supply water pipeline and located upstream of the fifth valve, a sixth valve is arranged on the first connecting pipeline, one end of the second connecting pipeline is connected to the second urban heat return water pipeline and located downstream of the fourth valve, the other end of the second connecting pipeline is connected to the second municipal water supply pipeline, and a seventh valve is arranged on the second connecting pipeline.

[0017] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0019] Figure 1 is a schematic diagram of a heat supply and water supply system of a water-heat co-production method combined with a cross-seasonal heat storage reservoir according to an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of a heat supply and water supply system of a water-heat co-production method combined with a cross-seasonal heat storage reservoir according to another embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a heat supply and water supply system of a water-heat co-production method combined with a cross-seasonal heat storage reservoir according to another embodiment of the present application in a non-heating season;

[0022] Figure 4This is a schematic diagram of the operation of the heating and water supply system of the cross-seasonal hot water storage reservoir method combining hydrothermal co-production according to another embodiment of the present invention during the heating season.

[0023] Figure Labels

[0024] Heating and water supply system combining hydrothermal co-production and cross-seasonal hot water storage reservoir method 1000;

[0025] Heat source 1; Hydro-heat co-production equipment 2; Long-distance single pipeline 3; Third valve 301; Hot water storage tank 4; Hot water storage section 401; Cold water storage section 402; Absorption heat exchanger 5; First urban water supply pipeline 6; Urban water supply valve 601; First pipeline network 7; First pipeline 701; Second pipeline 702; First valve 7011; Third pipeline 703; Second valve 7031; First urban heating pipeline network 8; First urban heating return water pipeline 801 ; First city heating water supply pipeline 802; Second city water supply pipeline 9; Second pipeline network 10; Fourth pipeline 1001; Fifth pipeline 1002; First connecting pipeline 11; Sixth valve 1101; Second connecting pipeline 12; Seventh valve 1201; Second city heating pipeline network 13; Second city heating return water pipeline 1301; Fourth valve 13011; Second city heating water supply pipeline 1302; Fifth valve 13021. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following is combined with Figures 1 to 4 The present invention describes a heating and water supply system 1000 for a cross-seasonal hot water storage reservoir method that combines hydrothermal co-production according to an embodiment of the present invention.

[0028] like Figure 1 and Figure 2As shown, the heating and water supply system 1000 of the combined hydrothermal and thermal power generation method with cross-seasonal hot water storage according to an embodiment of the present invention includes a combined hydrothermal and thermal power generation device 2, a long-distance single pipeline 3, a hot water storage reservoir 4, and an absorption heat exchanger 5. The combined hydrothermal and thermal power generation device 2 is located at a heat source 1, which can be low-parameter extraction steam waste heat from a power plant, etc. The combined hydrothermal and thermal power generation device 2 is a modified thermal seawater desalination device that can use the heat source 1 to produce hot freshwater below or above the boiling point from the original seawater and discharge concentrated seawater. The hot water storage tank 4 includes a hot water storage section 401 and a cold water storage section 402. The hot water storage tank 4 has a large enough capacity and a small specific surface area, resulting in minimal heat loss and temperature reduction to the environment. The hot water storage tank 4 can simultaneously utilize the hot water storage section 401 and the cold water storage section 402 to store hot and cold water respectively. For example, the upper layer of the hot water storage tank 4 is the hot water storage section 401 used for storing hot water, and the lower layer of the hot water storage tank 4 is the cold water storage section 402 used for storing cold water. The hot water storage section 401 and the cold water storage section 402 reduce heat conduction and convection heat transfer through temperature stratification or partitioning, thus enabling long-term, seasonal heat storage and release. The hot water storage tank 4 and the absorption heat exchanger 5 can be arranged near the city. The long-distance single pipe 3 is set between the hydro-thermal co-production equipment 2 and the hot water storage tank 4 or between the hydro-thermal co-production equipment 2 and the absorption heat exchanger 5. It can transport the hot fresh water produced by the hydro-thermal co-production equipment 2 to the hot water storage tank 4 or the absorption heat exchanger 5, so as to realize the simultaneous distribution of heat and fresh water.

[0029] When the temperature of hot fresh water is below its boiling point, such as Figure 1 As shown, the long-distance single pipeline 3 transports hot fresh water from the hydrothermal co-production equipment 2 to the hot water storage section 401; during the non-heating season, the cold water storage section 402 outputs cold water for urban water supply; while during the heating season, the hot water output from the hot water storage section 401 enters the absorption heat exchanger 5 to exchange heat with the first urban heat return water and then cools down before being used for urban water supply. At the same time, the first urban heat return water is heated up after passing through the absorption heat exchanger 5 to become the first urban heat supply water for urban heating. Understandably, by introducing the hot water storage reservoir 4, heating and water supply are decoupled, enabling the heating and water supply system 1000, which combines water and heat production with the cross-seasonal hot water storage method, to provide heating during the heating season and stable water supply throughout the year, meeting the demand characteristics of heating and water supply. The hot water storage reservoir 4 also distributes the heat supply during the heating season evenly throughout the year, greatly increasing the annual operating hours of the transmission and distribution system and equipment such as the water and heat production equipment 2 and the absorption heat exchanger 5, reducing the scale of the heating and water supply system 1000 (i.e., the scale of the water and heat production equipment 2 and the transmission and distribution system), thereby reducing the initial investment. Furthermore, the hot water storage reservoir 4 can undertake the task of peak heating, ensuring the safety of heating, and can also reduce the impact of unstable heat supply at heat source 1, alleviating the operational pressure at heat source 1.

[0030] When the temperature of hot fresh water is higher than its boiling point, such as Figure 2As shown, the long-distance single pipe 3 transports hot fresh water from the water-heat co-production device 2 to the absorption heat exchanger 5; in the non-heating season, the hot fresh water is cooled in the absorption heat exchanger 5 by heat exchange with the cold water from the cold water storage part 402, and then used for urban water supply, while the cold water from the cold water storage part 402 is heated to hot water by heat exchange with the absorption heat exchanger 5, and then enters the hot water storage part 401; in the heating season, the hot fresh water is cooled in the absorption heat exchanger 5 by heat exchange with the second urban heat return water, and then used for urban water supply, while the hot water output from the hot water storage part 401 is cooled by heat exchange with the second urban heat return water in the absorption heat exchanger 5, and then enters the cold water storage part 402, and the second urban heat return water is heated to the second urban heat supply water by heat exchange with the absorption heat exchanger 5, and then used for urban heat supply. It can be understood that a higher temperature of the long-distance hot fresh water can reduce the size of the distribution system or increase the heat radiation radius. Since the heat storage reservoir 4 is a constant pressure reservoir, the hot water storage part 401 cannot store hot water above the boiling point, therefore, the hot fresh water above the boiling point cannot be directly distributed to the hot water storage part 401, but must be cooled in the form of indirect heat exchange. By introducing the heat storage reservoir 4, the heat supply and water supply are decoupled, so that the heat supply and water supply system 1000 of the water-heat co-production combined with the cross-season heat storage reservoir method can realize heat supply in the heating season and stable water supply throughout the year, which meets the demand characteristics of heat supply and water supply; the heat storage reservoir 4 also evenly distributes the heat supply in the heating season to the whole year, greatly improves the annual operating hours of the distribution system and the water-heat co-production device 2, the absorption heat exchanger 5 and other equipment, reduces the size of the heat supply and water supply system 1000 of the water-heat co-production combined with the cross-season heat storage reservoir method (i.e. the size of the water-heat co-production device 2 distribution system), thereby reducing the initial investment; and the heat storage reservoir 4 can not only undertake the task of heat supply peak shaving to ensure the safety of heat supply, but also reduce the impact of unstable heat supply at the heat source 1 and relieve the operating pressure at the heat source 1.

[0031] In summary, the heating and water supply system 1000 of the water heat production and storage combined with cross-seasonal storage reservoir method has the following advantages: first, the storage reservoir 4 decouples the heating and water supply, so that the heating and water supply system 1000 of the water heat production and storage combined with cross-seasonal storage reservoir method can realize heating supply in the heating season and stable water supply throughout the year, which meets the demand characteristics of heating and water supply; second, only one long single pipe 3 is needed to simultaneously transport and distribute heat and fresh water, which meets the task that originally requires three pipes to complete; third, the storage reservoir 4 evenly distributes the heating capacity in the heating season to the whole year, greatly improves the annual operating hours of the distribution system and the water heat production equipment 2, the absorption heat exchanger 5 and other equipment, reduces the size of the heating and water supply system 1000 of the water heat production and storage combined with cross-seasonal storage reservoir method, and further reduces the initial investment; fourth, the storage reservoir 4 can not only undertake the task of heating peak regulation to ensure the safety of heating, but also reduce or avoid the impact of unstable heating capacity at the heat source 1, and relieve the operating pressure at the heat source 1. For example, when the steam extraction of a power plant is used as the heat source 1, the storage reservoir 4 can generate more electricity and less heat during the power consumption peak, generate less electricity and more heat during the power consumption low, and finally ensure that the heating capacity is equal to the total heating load in the heating season.

[0032] In some embodiments, when the temperature of the hot and fresh water is below the boiling point and in the heating season, the hot water output by the hot water storage part 401 enters the absorption heat exchanger 5 and exchanges heat with the first city heat return water to cool down, and part of it is used for city water supply and part of it enters the cold water storage part 402. That is, when the temperature of the hot and fresh water is below the boiling point and in the heating season, the hot water storage part 401 can output hot water at a large flow rate, taking into account the city heating demand and city water supply demand, and at the same time, the excess part of the cold water output from the absorption heat exchanger 5 is returned to the cold water storage part 402 for use as city water supply in the non-heating season.

[0033] In some embodiments, when the temperature of the hot and fresh water is below the boiling point, the heat stored by the hot water storage part 401 in the non-heating season and the heat of the long-distance hot and fresh water of the long-distance single pipe 3 in the heating season are just enough to be used for city heating in the heating season, and at the end of the heating season, the hot water of the hot water storage part 401 is cooled down, completing a cycle. Thus, the storage reservoir 4 evenly distributes the heating capacity in the heating season to the whole year, greatly improves the annual operating hours of the distribution system and the water heat production equipment 2, the absorption heat exchanger and other equipment, reduces the size of the heating and water supply system 1000 of the water heat production and storage combined with cross-seasonal storage reservoir method, and further reduces the initial investment.

[0034] In some embodiments, as Figure 1As shown, when the temperature of the hot fresh water is lower than the boiling point, the system further comprises a first city water supply pipeline 6, a first pipe network 7, and a first city heat supply pipeline 8, the first pipe network 7 has a first pipe 701 and a second pipe 702, and the first city heat supply pipeline 8 has a first city heat return water pipeline 801 and a first city heat supply water pipeline 802; wherein the long-distance single pipe 3 is connected between the water-heat co-production device 2 and the hot water storage part 401; the cold water storage part 402 is connected to one end of the first city water supply pipeline 6, and a city water supply valve 601 is arranged on the first city water supply pipeline 6; the absorption heat exchanger 5 is arranged on the first pipe network 7 and the first city heat supply pipeline 8, the first pipe 701 is located between the hot water storage part 401 and the absorption heat exchanger 5, a first valve 7011 is arranged on the first pipe 701, the second pipe 702 is connected between the absorption heat exchanger 5 and the first city water supply pipeline 6, and the connection between the second pipe 702 and the city water supply pipeline is located downstream of the city water supply valve 601, and the absorption heat exchanger 5 is located between the outlet end of the first city heat return water pipeline 801 and the inlet end of the first city heat supply water pipeline 802. In operation, when the temperature of the hot fresh water prepared by the water-heat co-production device 2 is lower than the boiling point, the long-distance single pipe 3 transports the hot fresh water prepared by the water-heat co-production device 2 to the hot water storage part 401 of the heat storage reservoir 4. In the non-heating season, the first valve 7011 is closed, the city water supply valve 601 is opened, and the cold water in the cold water storage part 402 of the heat storage reservoir 4 is directly used as city water supply and distributed to the city through the first city water supply pipeline 6. In the heating season, the first valve 7011 is opened, and the city water supply valve 601 is closed, the hot water in the hot water storage part 401 of the heat storage reservoir 4 is input into the absorption heat exchanger 5, and after heat exchange with the first city heat return water input into the absorption heat exchanger 5, the first city heat return water is cooled and used for city water supply, and the first city heat return water is heated to become first city heat supply water after passing through the absorption heat exchanger 5, and is transported through the first city heat supply water pipeline 802, thereby realizing city heat supply. In a specific example, the hot fresh water prepared by the water-heat co-production device 2 is 90℃, the heat storage parameters of the heat storage reservoir 4 are 90℃ / 30℃, that is, the temperature of the hot water in the hot water storage part 401 is 90℃, the temperature of the cold water in the cold water storage part 402 is 30℃, the temperature of the first city heat return water is 40℃, and the temperature of the first city heat supply water is 50℃.

[0035] In some embodiments, as Figure 1As shown, the first pipe network 7 also has a third pipe 703 connected between the cold water storage part 402 and the second pipe 702, and the second valve 7031 is arranged on the third pipe 703. Thus, in the non-heating season, the first valve 7011 is closed, the second valve 7031 is closed, the city water supply valve 601 is opened, and the cold water in the cold water storage part 402 of the heat storage reservoir 4 is directly used as city water supply, and is distributed to the city according to the flow of long-distance hot fresh water through the first city water supply pipe 6. In the heating season, the first valve 7011 is opened, the second valve 7031 is opened, the city water supply valve 601 is closed, the hot water in the hot water storage part 401 of the heat storage reservoir 4 is input into the absorption heat exchanger 5 through the first pipe 701, and is used for city water supply after being cooled by the first city heat return water pipe 801 input into the absorption heat exchanger 5, and is partially supplied to the city through the second pipe 702 and the first city water supply pipe 6, and is partially supplied to the city through the second pipe 702 and the third pipe 703 into the cold water storage part 402, and the first city heat return water is heated after passing through the absorption heat exchanger 5 to become the first city heat supply water, which is transported through the first city heat supply pipe 802 to realize city heating. Thus, the water flow of each link is determined according to the flow balance and the heat balance, so as to ensure that the heat storage amount of the heat storage reservoir 4 in the non-heating season and the cold storage amount in the heating season can meet the demand.

[0036] In some embodiments, when the temperature of the hot fresh water is higher than the boiling point, the heat stored in the hot water storage part 401 in the non-heating season and the heat of the long-distance hot fresh water of the long-distance single pipe 3 in the heating season are just enough to be used for city heating in the heating season, and at the end of the heating season, the hot water in the hot water storage part 401 is completely cooled, and a cycle is completed. Thus, the heat storage reservoir 4 realizes the average distribution of the heating amount in the heating season to the whole year, greatly improves the annual operating hours of the water heating combined production equipment 2, the absorption heat exchanger and other equipment, reduces the scale of the water heating and supply system 1000 of the water heating combined production and cross-season heat storage reservoir method, and further reduces the initial investment.

[0037] In some embodiments, as Figure 2As shown, when the temperature of the hot fresh water is higher than the boiling point, the system further comprises a second urban water supply pipeline 9, a second pipe network 10, a first connecting pipeline 11, a second connecting pipeline 12 and a second urban heat pipe network 13, the second pipe network 10 has a fourth pipeline 1001 and a fifth pipeline 1002, and the second urban heat pipe network 13 has a second urban heat return water pipeline 1301 and a second urban heat supply water pipeline 1302; wherein the long-distance single pipe 3 is connected between the water-heat co-production device 2 and the absorption heat exchanger 5; the third valve 301 is arranged on the long-distance single pipe 3, one end of the second urban water supply pipeline 9 is communicated with the long-distance single pipe 3 through the absorption heat exchanger 5; the absorption heat exchanger 5 is arranged on the second pipe network 10, the second urban heat pipe network 13 and the long-distance single pipe 3, the fourth pipeline 1001 is connected between the hot water storage part 401 and the absorption heat exchanger 5, the fifth pipeline 1002 is connected between the cold water storage part 402 and the absorption heat exchanger 5, the absorption heat exchanger 5 is located between the outlet end of the second urban heat return water pipeline 1301 and the inlet end of the second urban heat supply water pipeline 1302, the fourth valve 13011 is arranged on the second urban heat return water pipeline 1301, and the fifth valve 13021 is arranged on the second urban heat supply water pipeline 1302; one end of the first connecting pipeline 11 is connected to the long-distance single pipe 3 and located upstream of the third valve 301, the other end of the first connecting pipeline 11 is connected to the second urban heat supply water pipeline 1302 and located upstream of the fifth valve 13021, the sixth valve 1101 is arranged on the first connecting pipeline 11, one end of the second connecting pipeline 12 is connected to the second urban heat return water pipeline 1301 and located downstream of the fourth valve 13011, the other end of the second connecting pipeline 12 is connected to the second urban water supply pipeline 9, and the seventh valve 1201 is arranged on the second connecting pipeline 12. Figure 2 and Figure 3 As shown, the third valve 301 is closed, the fourth valve 13011 is closed, the fifth valve 13021 is closed, the sixth valve 1101 is opened, and the seventh valve 1201 is opened, the hot fresh water prepared by the water-heat co-production device 2 enters the absorption heat exchanger 5 through the long-distance single pipe 3, the first connecting pipeline 11 and the second urban heat supply water pipeline 1302, and exchanges heat with the cold water input into the absorption heat exchanger 5 through the fifth pipeline 1002 from the cold water storage part 402, and is cooled to be used for urban water supply and distributed to the city through the second urban heat return water pipeline 1301, the second connecting pipeline 12 and the second urban water supply pipeline 9, and the cold water input into the absorption heat exchanger 5 through the fifth pipeline 1002 from the cold water storage part 402 is warmed to be hot water after passing through the absorption heat exchanger 5, and enters the hot water storage part 401 through the fourth pipeline 1001. Figure 2 and Figure 4As shown, when the hot fresh water prepared by the water-heat co-production device 2 has a temperature higher than the boiling point and in the non-heating season, the third valve 301 is opened, the fourth valve 13011 is opened, the fifth valve 13021 is opened, the sixth valve 1101 is closed, and the seventh valve 1201 is closed, the hot fresh water in the long-distance single pipe 3 enters the absorption heat exchanger 5, at the same time, the hot water in the hot water storage part 401 enters the absorption heat exchanger 5 through the fourth pipeline 1001, and all of them exchange heat with the second heat return water in the absorption heat exchanger 5 through the second city heat return pipeline 1301. The hot fresh water in the long-distance single pipe 3 is cooled after passing through the absorption heat exchanger 5 and used as city water supply, and is transported to the city through the second city water supply pipeline 9. The hot water in the hot water storage part 401 is cooled after passing through the absorption heat exchanger 5 and becomes cold water which enters the cold water storage part 402 through the fifth pipeline 1002. The second city heat return pipeline 1301 is heated after absorbing heat in the absorption heat exchanger 5 and becomes the second city heat supply water which supplies heat to the city through the second city heat supply pipeline 1302. In a specific example, the hot fresh water prepared by the water-heat co-production device 2 is 120℃, the hot fresh water of 120℃ is cooled to 20℃ cold water after passing through the absorption heat exchanger 5, and is directly used for city water supply. The temperature of the hot water in the hot water storage part 401 of the heat storage reservoir 4 is 90℃, the temperature of the cold water in the cold water storage part 402 is 20℃, the temperature of the second city heat return water is 40℃, and the temperature of the second city heat supply water is 50℃.

[0038] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements, and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A heating and water supply system based on a combined hydrothermal and thermal energy production method using a cross-seasonal hot water storage reservoir, characterized in that: It includes a hydrothermal co-production device, a long-distance single pipeline, a hot water storage tank, and an absorption heat exchanger. The hydrothermal co-production device is located at the heat source and uses the heat source to produce hot fresh water with a boiling point or lower than the boiling point from seawater. The hot water storage tank includes a hot water storage section and a cold water storage section. Both the hot water storage tank and the absorption heat exchanger are located near the city. When the temperature of the hot fresh water is below the boiling point, the long-distance single pipeline transports the hot fresh water from the hydrothermal co-production equipment to the hot water storage section; during the non-heating season, the cold water storage section outputs cold water for urban water supply; while during the heating season, the hot water output from the hot water storage section enters the absorption heat exchanger to exchange heat with the first urban heat return water and is then cooled before being used for urban water supply. At the same time, the first urban heat return water is heated up after passing through the absorption heat exchanger to become the first urban heat supply water for urban heating. When the temperature of the hot freshwater is above its boiling point, the long-distance single-pipe transports the hot freshwater from the hydrothermal co-production equipment to the absorption heat exchanger. During the non-heating season, the hot freshwater is cooled by exchanging heat with cold water from the cold water storage section in the absorption heat exchanger and then used for urban water supply. At the same time, the cold water from the cold water storage section is heated to hot water by the absorption heat exchanger and then enters the hot water storage section. During the heating season, the hot freshwater is cooled by exchanging heat with the second urban heat return water in the absorption heat exchanger and then used for urban water supply. At the same time, the hot water output from the hot water storage section enters the absorption heat exchanger and is cooled by exchanging heat with the second urban heat return water and then enters the cold water storage section. The second urban heat return water is heated by the heat from the hot freshwater transported by the long-distance single-pipe and the hot water output from the hot water storage section after passing through the absorption heat exchanger and then becomes second urban heat supply water for urban heating.

2. The heating and water supply system of the combined hydrothermal and thermal energy production and cross-seasonal hot water storage reservoir method according to claim 1, characterized in that, When the temperature of the hot fresh water is below the boiling point and it is during the heating season, the hot water output from the hot water storage section enters the absorption heat exchanger to exchange heat with the first urban heat return water and is then cooled. Part of the cooled water is used for urban water supply and part enters the cold water storage section.

3. The heating and water supply system of the combined hydrothermal and thermal energy production and cross-seasonal hot water storage reservoir method according to claim 1 or 2, characterized in that, When the temperature of the hot fresh water is below the boiling point, the heat stored in the hot water storage section during the non-heating season and the heat of the long-distance hot fresh water in the long-distance single pipe during the heating season are just enough to supply heat to the city during the heating season. At the end of the heating season, all the hot water in the hot water storage section is cooled, completing one cycle.

4. The heating and water supply system of the combined hydrothermal and thermal energy production and cross-seasonal hot water storage reservoir method according to claim 1, characterized in that, When the temperature of the hot fresh water is below the boiling point, the system also includes a first urban water supply pipeline, a first pipeline network, and a first urban heating pipeline network. The first pipeline network has a first pipeline and a second pipeline. The first urban heating pipeline network has a first urban heating return pipeline and a first urban heating supply pipeline. The long-distance single pipeline connects the hydrothermal co-production equipment to the hot water storage section. The cold water storage section is connected to one end of the first urban water supply pipeline, and the first urban water supply pipeline is equipped with an urban water supply valve. The absorption heat exchanger is installed on the first pipeline network and the first urban heating pipeline network. The first pipeline is located between the hot water storage section and the absorption heat exchanger, and the first pipeline is equipped with a first valve. The second pipeline connects the absorption heat exchanger to the first urban water supply pipeline. The connection point between the second pipeline and the urban water supply pipeline is located downstream of the urban water supply valve. The absorption heat exchanger is located between the outlet end of the first urban heating return pipeline and the inlet end of the first urban heating supply pipeline.

5. The heating and water supply system of the combined hydrothermal and thermal energy production and cross-seasonal hot water storage reservoir method according to claim 4, characterized in that, The first pipeline also has a third pipeline, which is connected between the cold water storage section and the second pipeline, and a second valve is provided on the third pipeline.

6. The heating and water supply system of the combined hydrothermal and thermal energy production and cross-seasonal hot water storage reservoir method according to claim 1, characterized in that, When the temperature of the hot fresh water is higher than the boiling point, the heat stored in the hot water storage section during the non-heating season and the heat of the long-distance hot fresh water in the long-distance single pipe during the heating season are just enough to supply heat to the city during the heating season. At the end of the heating season, all the hot water in the hot water storage section is cooled down, completing one cycle.

7. The heating and water supply system of the combined hydrothermal and thermal energy production and cross-seasonal hot water storage reservoir method according to claim 1, characterized in that, When the temperature of the hot fresh water is higher than the boiling point, the system also includes a second city water supply pipeline, a second pipeline network, a first connecting pipeline, a second connecting pipeline, and a second city heating pipeline network. The second pipeline network has a fourth pipeline and a fifth pipeline. The second city heating pipeline network has a second city heat return pipeline and a second city heat supply pipeline. The long-distance single pipe connects the hydrothermal co-production equipment to the absorption heat exchanger. A third valve is installed on the long-distance single pipe. One end of the second city water supply pipeline is connected to the long-distance single pipe through the absorption heat exchanger. The absorption heat exchanger is installed on the second pipeline network, the second city heating pipeline network, and the long-distance single pipe. The fourth pipeline connects the hot water storage section to the absorption heat exchanger, and the fifth pipeline connects the cold water storage section to the absorption heat exchanger. Between the heat exchangers, the absorption heat exchanger is located between the outlet end of the second city heat return water pipeline and the inlet end of the second city heat supply water pipeline. A fourth valve is provided on the second city heat return water pipeline, and a fifth valve is provided on the second city heat supply water pipeline. One end of the first connecting pipeline is connected to the long-distance single pipeline and is located upstream of the third valve. The other end of the first connecting pipeline is connected to the second city heat supply water pipeline and is located upstream of the fifth valve. A sixth valve is provided on the first connecting pipeline. One end of the second connecting pipeline is connected to the second city heat return water pipeline and is located downstream of the fourth valve. The other end of the second connecting pipeline is connected to the second city water supply water pipeline. A seventh valve is provided on the second connecting pipeline.

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