Air source steam supply system based on horizontal steam generator and control method

Abstract

The invention discloses an air source steam supply system based on a horizontal steam generator and a control method. According to the air source steam supply system based on the horizontal steam generator, through cooperative work of the first heat pump circulation channel and the second heat pump circulation channel, the first heat pump circulation channel firstly extracts heat from low-temperature environment air; the second heat pump circulation channel further raises the temperature of the refrigerant so that the refrigerant can heat and soften water through the horizontal evaporator, and the energy utilization efficiency of the system is improved. The fused salt energy storage module of the system ensures the normal operation of the horizontal evaporator when the external environment temperature is extremely low and the operation economy of the heat pump is not high. Furthermore, the softened water absorbs heat of the second refrigerant in the horizontal evaporator to be vaporized, flash evaporation is not needed any more, pressure loss of steam is reduced, the steam yield and quality of the steam supply system are improved, and stable output of steam is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of horizontal steam generation, and in particular to an air source steam supply system based on a horizontal steam generator and a control method. Background Art

[0002] As an important energy conversion and utilization device, steam heat pump system is widely used in food, medicine, chemical industry, textile and other industrial fields.

[0003] In extremely cold conditions, the air itself contains very little heat, and the efficiency of the evaporator to absorb heat from the environment will be greatly reduced. Even if more external energy such as electricity is consumed to make up for the lack of heat, it is difficult to ensure that sufficient and stable steam can be produced. For example, in chemical production, if the steam supply is unstable, it may lead to the inability to accurately control parameters such as reaction temperature and pressure on the production line, affecting product quality, and even forcing production to be suspended, causing economic losses.

[0004] Existing steam heat pump systems generally use flash tanks to mix external energy and air sources to generate steam. However, when any of the temperature, pressure, and flow rate of the input liquid in the flash tank does not meet the standards, the flash evaporation effect will be greatly reduced. In addition, traditional flash evaporation to produce steam also has problems such as low energy utilization. Summary of the invention

[0005] The present invention provides an air source steam supply system based on a horizontal steam generator and a control method thereof, so as to solve the problems of poor steam supply stability and low energy utilization rate in a traditional air source steam supply system.

[0006] In the first aspect, an embodiment of the present invention provides an air source steam supply system based on a horizontal steam generator, comprising: a first heat pump circulation channel and a second heat pump circulation channel; the first heat pump circulation channel comprises an evaporator, a first compression pump, an evaporative condenser and a first expansion valve which are circulated and connected in sequence through a pipeline, and a first refrigerant flows in the first heat pump circulation channel; the evaporator is used to absorb heat from the environment through the first refrigerant in a low-temperature and low-pressure state, and change the first refrigerant into a low-temperature gaseous state; the first compression pump is used to compress the first refrigerant in a low-temperature gaseous state, and change the first refrigerant into a high-temperature and high-pressure state; the evaporative condenser is used to release the heat of the first refrigerant in a high-temperature and high-pressure state for heat exchange, and change the first refrigerant into a low-temperature and high-pressure state; the first expansion valve is used to expand the first refrigerant in a low-temperature and high-pressure state to an evaporation pressure, so as to restore the first refrigerant to a low-temperature and low-pressure state; the second heat pump circulation channel comprises an evaporator in the first heat pump circulation channel The condenser also includes a second compression pump, a horizontal steam generator and a second expansion valve; the evaporative condenser, the second compression pump, the horizontal steam generator and the second expansion valve are circulated and connected in sequence through a pipeline; a second refrigerant flows in the second heat pump circulation channel; the evaporative condenser is also used to absorb the heat of the first refrigerant in a high temperature and high pressure state in the first heat pump circulation channel through the second refrigerant in a low temperature and low pressure state to perform heat exchange, and change the second refrigerant into a low temperature gaseous state; the second compression pump is used to compress the second refrigerant in a high temperature and low pressure state, and change the second refrigerant into a high temperature and high pressure state; softened water is contained in the horizontal steam generator, and the horizontal steam generator is used to perform heat exchange between the second refrigerant in a high temperature and high pressure state and the softened water, so as to change the second refrigerant into a low temperature and high pressure state, and evaporate the softened water to form low pressure steam; the second expansion valve is used to expand the second refrigerant in a low temperature and high pressure state to an evaporation pressure, so as to restore the second refrigerant to a low temperature and low pressure state.

[0007] Optionally, the first heat pump circulation channel also includes an economizer, which includes an intermediate expansion valve and a first heat exchanger; the first input end of the first heat exchanger is connected to the evaporative condenser, and the first output end is respectively connected to the first expansion valve and the intermediate expansion valve; the output end of the intermediate expansion valve is connected to the second input end of the first heat exchanger, and the second output end of the first heat exchanger is connected to the first compression pump; the intermediate expansion valve is used to expand part of the first refrigerant in a low-temperature and high-pressure state, and adjust the first refrigerant to a low-temperature and medium-pressure state; the first heat exchanger is used to use the first refrigerant in a low-temperature and medium-pressure state to absorb heat in the remaining part of the first refrigerant in a low-temperature and high-pressure state, and change part of the first refrigerant in a low-temperature and low-pressure state to a medium-pressure gas state.

[0008] Optionally, the horizontal steam generator includes at least one heat exchange tube, a softened water inlet pipe, a first output channel and / or a second output channel; a heat medium flows in the heat exchange tube for heating softened water to form water vapor; the softened water inlet pipe is connected to the horizontal steam generator for replenishing softened water; the first output channel is connected to the horizontal steam generator for outputting low-pressure steam; the second output channel is connected to the horizontal steam generator and is provided with a compression pump for pressurizing the low-pressure steam and outputting high-pressure steam.

[0009] Optionally, the steam supply system also includes a molten salt circulation channel, which includes a horizontal steam generator in the second heat pump circulation channel, and also includes a molten salt energy storage tank and a circulation pump, and the horizontal steam generator, the lava energy storage tank and the circulation pump are sequentially connected in a circulation manner through pipelines; a heater is provided in the molten salt energy storage tank; the molten salt energy storage tank is used to store high-temperature molten salt as a heat energy carrier; the heater is used to heat the molten salt to a predetermined temperature, or to maintain the temperature of the molten salt; the circulation pump is used to drive the molten salt stored in the molten salt energy storage module to exchange heat with the softened water in the horizontal steam generator, so that the softened water evaporates to form low-pressure steam.

[0010] Optionally, the steam supply system also includes a heat matching and regulating module, which includes a circulation pump in the molten salt energy storage module, and also includes a water pump, a second heat exchanger and a temperature sensor; the water pump, the second heat exchanger and the evaporative condenser are connected in sequence through pipelines; the water pump is used to input water into the second heat exchanger; the second heat exchanger is also connected to the molten salt circulation channel, and is used to exchange heat between the molten salt circulation channel and water to increase the temperature of the water; the temperature sensor is arranged at the second channel outlet of the evaporative condenser, and is used to detect and obtain the temperature at the second channel outlet of the evaporative condenser; the evaporative condenser is also used to absorb the heat of the water in the heat matching regulating module through the second refrigerant in a low-temperature and low-pressure state to perform heat exchange, and change the second refrigerant into a low-pressure gas state.

[0011] Optionally, the horizontal steam generator includes a first heat exchange tube and a second heat exchange tube, and the second heat exchange tube is arranged in parallel with the first heat exchange tube; the first heat exchange tube is used to pass high-temperature molten salt when the molten salt energy storage module provides heat, and the second heat exchange tube is used to pass high-temperature molten salt when the molten salt energy storage module provides heat.

[0012] Optionally, the evaporative condenser is provided with a first channel, a second channel and a third channel which are isolated from each other; the refrigerant in the first heat pump circulation system flows in the first channel; the refrigerant in the second heat pump circulation system flows in the second channel; the third channel is used to pass normal temperature water or heated water; the refrigerant in the second channel spontaneously exchanges heat with the refrigerant flowing through the first channel and / or the water in the third channel.

[0013] In a second aspect, an embodiment of the present invention provides an air source steam supply control method based on a horizontal steam generator, which is used to control the air source steam supply system based on the horizontal steam generator in the first aspect, wherein the working process of the supply system includes a first time period, which is a low electricity consumption period; in the first time period, the method includes: starting the evaporator to absorb heat from the environment through a first refrigerant in a low-temperature and low-pressure state, and changing the first refrigerant to a low-pressure gaseous state; starting the first compression pump to compress the first refrigerant in a low-pressure gaseous state, and changing the first refrigerant to a high-temperature and high-pressure state; and releasing the heat of the first refrigerant in a high-temperature and high-pressure state through an evaporative condenser for heat exchange, and changing the first refrigerant to a low-temperature and high-pressure state; opening the first expansion valve to convert the low-temperature and high-pressure gas into a low-pressure gaseous state; and The first refrigerant in the state is expanded to the evaporation pressure, so that the first refrigerant is restored to the low temperature and low pressure state; the evaporative condenser is started to absorb the heat of the first refrigerant in the high temperature and high pressure state in the first heat pump circulation channel through the second refrigerant in the low temperature and low pressure state to perform heat exchange, and change the second refrigerant to a low temperature gaseous state; the second compression pump is started to compress the second refrigerant in the low temperature gaseous state, change the second refrigerant to a high temperature and high pressure state, and the second refrigerant in the high temperature and high pressure state is heat exchanged with softened water through the horizontal steam generator to change the second refrigerant to a low temperature and high pressure state, so that the softened water evaporates to form low pressure steam; the second expansion valve is opened to expand the second refrigerant in the low temperature and high pressure state to the evaporation pressure, so that the second refrigerant is restored to a low temperature and low pressure state.

[0014] Optionally, the steam supply system also includes a molten salt circulation channel, which includes a horizontal steam generator in the second heat pump circulation channel, and also includes a molten salt energy storage tank and a circulation pump; the horizontal steam generator, the lava energy storage tank and the circulation pump are connected in sequence through a pipeline; a heater is provided in the molten salt energy storage tank; the molten salt energy storage tank is used to store high-temperature molten salt as a heat energy carrier; the working process of the supply system also includes a second time period, which is a time period of power restriction, peak power consumption or an external temperature lower than the first temperature; in the first time period, the method also includes: turning on the heater to heat the molten salt to a predetermined temperature, or maintaining the molten salt temperature; in the second time period, the method also includes: turning on the circulation pump to drive the molten salt stored in the molten salt energy storage module to exchange heat with the softened water in the horizontal steam generator, so that the softened water evaporates to form low-pressure steam.

[0015] Optionally, the steam supply system also includes a heat matching and regulating circulation channel, which includes a circulation pump, a water pump, a second heat exchanger, and a temperature sensor; the water pump, the second heat exchanger, and the evaporative condenser are sequentially connected through pipelines; the heat exchanger is also connected to the molten salt energy storage module through the circulation pump; the temperature sensor is arranged at the outlet of the second channel of the evaporative condenser; the heat matching and regulating module includes the circulation pump in the molten salt energy storage module, and also includes a water pump, a second heat exchanger and a temperature sensor; in the first time period, the method also includes: obtaining the temperature at the outlet of the second channel of the evaporative condenser through the temperature sensor; in the evaporative cooling When the temperature at the outlet of the second channel of the condenser is lower than the first preset temperature, the water pump is turned on to input water into the second heat exchanger, and the molten salt circulation channel is heat-exchanged with the water through the second heat exchanger to increase the temperature of the water, so that the second refrigerant in the evaporative condenser absorbs the heat of the water in the heat matching adjustment module to perform heat exchange, thereby increasing the temperature of the second refrigerant; when the temperature at the outlet of the second channel of the evaporative condenser is higher than the second preset temperature, the water pump is turned on to pass normal temperature water into the evaporative condenser, so that the water in the heat matching adjustment module in the evaporative condenser absorbs the heat of the second refrigerant to perform heat exchange, thereby reducing the temperature of the second refrigerant;

[0016] Wherein, the first preset temperature is lower than the second preset temperature.

[0017] The embodiment of the present invention sets up the collaborative work of the first heat pump circulation channel and the second heat pump circulation channel. The first heat pump circulation channel first extracts heat from the low-temperature ambient air, and the second heat pump circulation channel further increases the temperature of the refrigerant so that it can heat the softened water through the horizontal evaporator, thereby improving the energy utilization efficiency of the system. The molten salt energy storage module of the system ensures the normal operation of the horizontal evaporator when the external ambient temperature is extremely low and the heat pump operation is not economical. Furthermore, the softened water absorbs the heat of the second refrigerant in the horizontal evaporator to vaporize, and no flash evaporation is performed, which reduces the pressure loss of the steam, thereby improving the steam production and quality of the steam supply system and ensuring the stable output of steam.

[0018] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1A schematic structural diagram of an air source steam supply system with molten salt heat storage provided in an embodiment of the present invention;

[0021] Figure 2 A schematic flow chart of an air source steam supply control method based on a horizontal steam generator provided in an embodiment of the present invention;

[0022] Figure 3 A schematic flow chart of another air source steam supply control method based on a horizontal steam generator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, module, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Figure 1 A schematic diagram of the structure of an air source steam supply system with molten salt heat storage provided by an embodiment of the present invention is shown in FIG. Figure 1As shown, the system includes: a first heat pump circulation channel and a second heat pump circulation channel; the first heat pump circulation channel includes an evaporator 11, a first compression pump 12, an evaporative condenser 13 and a first expansion valve 14 which are sequentially circulated and connected through a pipeline, and a first refrigerant flows in the first heat pump circulation channel; the evaporator 11 is used to absorb heat from the environment through the first refrigerant in a low-temperature and low-pressure state, and change the first refrigerant to a low-pressure gas state; the first compression pump 12 is used to compress the first refrigerant in a low-pressure gas state, and change the first refrigerant to a high-temperature and high-pressure state; the evaporative condenser 13 is used to release the heat of the first refrigerant in a high-temperature and high-pressure state to perform heat exchange, and change the first refrigerant to a low-temperature and high-pressure state; the first expansion valve 14 is used to expand the first refrigerant in a low-temperature and high-pressure state to an evaporation pressure, so that the first refrigerant is restored to a low-temperature and low-pressure state; the second heat pump circulation channel includes the evaporative condenser 13 in the first heat pump circulation channel, and also includes a second compression pump 21, a horizontal evaporator condenser 13 and a first expansion valve 14. The steam generator 22 and the second expansion valve 23; the evaporative condenser 13, the second compression pump 21, the horizontal steam generator 22 and the second expansion valve 23 are circulated and connected in sequence through the pipeline; the second refrigerant flows in the second heat pump circulation channel; the evaporative condenser 13 is also used to absorb the heat of the first refrigerant in the high temperature and high pressure state in the first heat pump circulation channel through the second refrigerant in the low temperature and low pressure state to perform heat exchange, and change the second refrigerant into a low pressure gas state; the second compression pump 21 is used to compress the second refrigerant in the low pressure gas state, and change the second refrigerant into a high temperature and high pressure state; the horizontal steam generator 22 contains softened water, and the horizontal steam generator 22 is used to perform heat exchange between the second refrigerant in the high temperature and high pressure state and the softened water, so as to change the second refrigerant into a low temperature and high pressure state, so as to evaporate the softened water to form low pressure steam; the second expansion valve 23 is used to expand the second refrigerant in the low temperature and high pressure state to the evaporation pressure, so as to restore the second refrigerant to the low temperature and low pressure state.

[0026] In the embodiments of the present invention, the various structural components mentioned, such as valves, heat exchangers, etc., are designed and selected based on the basic principle of satisfying their respective required functions. In practical applications, the specific forms, models, specifications, etc. of these structures do not need to strictly follow the descriptions or examples in the embodiments of the present invention.

[0027] Among them, the first heat pump circulation channel can be understood as the circulation channel of the low temperature stage in the cascade air source heat pump, and it is increased to medium temperature heat energy through the heat pump circulation; the second heat pump circulation channel can be understood as the circulation channel of the high temperature stage in the cascade air source heat pump, and its temperature is further increased to meet the demand for high temperature heat energy; the evaporative condenser 13 can be understood as a dual-function heat exchanger, that is, it is used as a condenser in the first heat pump circulation channel (releasing the heat of high-temperature and high-pressure refrigerant), and is also used as an evaporator in the second heat pump circulation channel (absorbing the heat released in the first heat pump circulation channel).

[0028] It should be noted that the above-mentioned refrigerant states, such as low temperature and low pressure, low temperature gaseous state, high temperature and high pressure, and low temperature and high pressure, are all relative to the changes of the refrigerant during the cycle. For example, after the first refrigerant with high temperature and high pressure releases heat in the evaporative condenser 13, the temperature is lower than the temperature before entering the evaporative condenser 13, and the pressure of the refrigerant in this process does not change substantially, so the state of the first refrigerant changes from high temperature and high pressure to low temperature and high pressure. The first refrigerant and the second refrigerant can be the same refrigerant type or different refrigerant types, depending on the specific design and operation requirements of the system, which is not limited in this application.

[0029] Specifically, the first refrigerant in the first heat pump circulation channel absorbs heat from the environment through the evaporator 11, enters the evaporative condenser 13 to release heat after being compressed by the first compressor 12 to increase enthalpy, then enters the first expansion valve 14 to expand to the evaporation pressure, and then enters the evaporator 11 again. In the second heat pump circulation channel, the second refrigerant in the second heat pump circulation system absorbs heat from the first refrigerant in the first heat pump circulation system through the evaporative condenser 13, the second refrigerant enters the horizontal steam generator 22 to heat the softened water after being compressed by the second compressor 21 to increase enthalpy, and then the second refrigerant enters the second expansion valve 23 to expand to the evaporation pressure and then enters the evaporative condenser 13 to absorb heat again.

[0030] The embodiment of the present invention sets up the collaborative work of the first heat pump circulation channel and the second heat pump circulation channel. The first heat pump circulation channel first extracts heat from the low-temperature ambient air, and the second heat pump circulation channel further increases the temperature of the refrigerant so that it can heat the softened water through the horizontal evaporator, thereby improving the energy utilization efficiency of the system. The molten salt energy storage module of the system ensures the normal operation of the horizontal evaporator when the external ambient temperature is extremely low and the heat pump operation is not economical. Furthermore, the softened water absorbs the heat of the second refrigerant in the horizontal evaporator to vaporize, and no flash evaporation is performed, which reduces the pressure loss of the steam, thereby improving the steam production and quality of the steam supply system and ensuring the stable output of steam.

[0031] Optionally, the first heat pump circulation channel also includes an economizer 15, which includes an intermediate expansion valve 151 and a first heat exchanger 152; the first input end of the first heat exchanger 152 is connected to the evaporative condenser 13, and the first output end is respectively connected to the first expansion valve 14 and the intermediate expansion valve 151; the output end of the intermediate expansion valve 151 is connected to the second input end of the first heat exchanger 152, and the second output end of the first heat exchanger 152 is connected to the first compression pump 12; the intermediate expansion valve 151 is used to expand part of the first refrigerant in a low-temperature and high-pressure state, and adjust the first refrigerant to a low-temperature and medium-pressure state; the first heat exchanger 152 is used to use the first refrigerant in a low-temperature and low-pressure state to absorb the heat in the remaining part of the first refrigerant in a low-temperature and high-pressure state, and change part of the first refrigerant in a low-temperature and low-pressure state to a medium-pressure gas state.

[0032] Among them, the economizer can be understood as a device that recovers and reuses heat through internal heat exchange in a heat pump system; the intermediate expansion valve 151 can be understood as a device that has the same function as the first expansion valve 14 and the second expansion valve 23, and is used to control the flow and pressure of the refrigerant to cause it to expand and reduce its pressure; the first heat exchanger 152 can be understood as a device used for heat exchange in the economizer 15, which allows the low-temperature and medium-pressure refrigerant to absorb the heat of the high-temperature and low-pressure refrigerant.

[0033] Specifically, the first refrigerant outputted by the evaporative condenser 13 first passes through a certain channel of the first heat exchanger 152 (flowing in from the first input end and flowing out from the first output end), and then a part of the first refrigerant is expanded to the gas replenishment pressure through the intermediate expansion valve 151, and the other part is expanded to a low-temperature and low-pressure state suitable for evaporation through the first expansion valve 14. The temperature of the first refrigerant expanded by the intermediate expansion valve 151 is lower than that of the unexpanded first refrigerant, so when the expanded first refrigerant passes through another channel of the first heat exchanger 152 (flowing in from the second input end and flowing out from the first output end), it absorbs heat in the unexpanded first refrigerant through heat exchange, and the first refrigerant after absorbing heat is sprayed into the first compressor 12 for gas replenishment.

[0034] It should be noted that there is an optimal pre-gas-filling pressure ratio for the gas-filling pressure, and different refrigerants have different thermophysical properties and therefore have different optimal gas-filling pressures.

[0035] The embodiment of the present invention further releases the heat in the first refrigerant by arranging an economizer, effectively recovers and reuses the heat in the system, and improves the efficiency and performance of the heat pump system.

[0036] Optionally, the horizontal steam generator 22 includes at least one heat exchange tube 221, a softened water inlet pipe 222, a first output channel 223 and / or a second output channel 224; a heat medium flows in the heat exchange tube 221 for heating the softened water to form water vapor; the softened water inlet pipe 222 is connected to the horizontal steam generator 22 for replenishing softened water; the first output channel 223 is connected to the horizontal steam generator 22 for outputting low-pressure steam; the second output channel 224 is connected to the horizontal steam generator 22 and is provided with a compression pump for pressurizing the low-pressure steam and outputting high-pressure steam.

[0037] The heat medium may be understood as a medium in a heat exchanger that has a relatively high temperature and releases heat (for example, it may be a refrigerant or other heat source).

[0038] Specifically, during the operation of the horizontal steam generator 22, softened water is added to the horizontal steam generator 22 through the softened water inlet pipe 222 to ensure that the water level is normal. Then, the softened water is heated by the heat medium flowing in the heat exchange tube 221 to form water vapor, and the valve corresponding to the first output channel 223 is opened to output low-pressure steam through the first output channel 223. Furthermore, in the case where high-pressure steam is required, the valve corresponding to the first output channel 223 is closed, and the valve corresponding to the second output channel 224 is opened, and the high-pressure steam is output after being pressurized by setting a compressor.

[0039] The horizontal steam generator provided in the embodiment of the present invention improves the utilization rate and adaptability of the equipment by setting a first output channel and / or a second output channel to selectively output low-pressure steam and high-pressure steam according to different steam requirements, and provides users with a more flexible and convenient steam solution.

[0040] Optionally, the steam supply system also includes a molten salt circulation channel, which includes a horizontal steam generator 22 in the second heat pump circulation channel, and also includes a molten salt energy storage tank 31 and a circulation pump 32. The horizontal steam generator 22, the molten salt energy storage tank 31 and the circulation pump 32 are circulated and connected in sequence through pipelines; a heater 311 is provided in the molten salt energy storage tank 31; the molten salt energy storage tank 31 is used to store high-temperature molten salt as a heat energy carrier; the heater 311 is used to heat the molten salt to a predetermined temperature, or to maintain the temperature of the molten salt; the circulation pump 32 is used to drive the molten salt stored in the molten salt energy storage module to exchange heat with the softened water in the horizontal steam generator 22, so that the softened water evaporates to form low-pressure steam.

[0041] Among them, the molten salt circulation channel can be understood as a closed circulation system that uses molten salt as a heat medium for heat energy transfer and conversion; the molten salt energy storage tank 31 can be understood as a device for storing high-temperature molten salt; the circulation pump 32 can be understood as a power source that drives the molten salt to circulate in the molten salt circulation channel.

[0042] Specifically, in the energy storage stage, the heater 311 heats the molten salt in the molten salt energy storage tank 31 to a predetermined temperature, or maintains its temperature, to ensure that the molten salt can continuously provide stable thermal energy. In the heat release stage, the molten salt is pumped out of the molten salt energy storage tank 31 by the circulation pump 32 and transported to the horizontal steam generator 22 through the molten salt circulation channel; in the horizontal steam generator 22, the molten salt exchanges heat with softened water, transfers heat energy to the softened water, and evaporates it to form steam; after the molten salt releases heat in the horizontal evaporator, it enters the molten salt energy storage tank 31 again for heating.

[0043] The molten salt circulation channel provided in the embodiment of the present invention stores a large amount of high-temperature molten salt by setting up a molten salt energy storage tank. When the heat pump system stops working, the molten salt energy storage tank can quickly transfer heat energy to the horizontal steam generator through the circulation pump, thereby improving the stability and continuity of the entire steam supply.

[0044] Optionally, the steam supply system also includes a heat matching and regulating module 40, which includes a circulation pump 32 in the molten salt energy storage module, and also includes a water pump 41, a second heat exchanger 42 and a temperature sensor 43; the water pump 41, the second heat exchanger 42, and the evaporative condenser 13 are connected in sequence through pipelines; the water pump 41 is used to input water to the second heat exchanger 42; the second heat exchanger 42 is also connected to the molten salt circulation channel, and is used to exchange heat between the molten salt circulation channel and water to increase the temperature of the water; the temperature sensor 43 is arranged at the entrance of the first channel 131 of the evaporative condenser 13, and is used to detect and obtain the temperature at the entrance of the first channel 131 of the evaporative condenser 13; the evaporative condenser 13 is also used to absorb the heat of the water in the heat matching and regulating module 40 through the second refrigerant in a low-temperature and low-pressure state for heat exchange, thereby changing the second refrigerant into a low-pressure gas state.

[0045] Among them, the heat matching adjustment module 40 can be understood as a module that adjusts the output temperature of the second heat pump circulation pipeline by providing water of different temperatures; the second heat exchanger 42 can be understood as a dual-channel heat exchanger. If normal temperature water and molten salt are respectively introduced, the molten salt is the heat medium and the normal temperature water is the coolant to heat the normal temperature water.

[0046] Specifically, the temperature of the first refrigerant in the first heat pump circulation channel is confirmed by a temperature sensor 43 arranged at the outlet of the second channel 132 of the evaporative condenser 13. If the temperature of the second refrigerant is low, it means that the heat provided by the first heat pump is insufficient, and then the room temperature water is heated by the high-temperature molten salt, and then the second refrigerant is heated by the heated water to increase the output temperature of the second heat pump circulation channel; if the temperature of the second refrigerant is high, it means that the heat provided by the first heat pump is excessive, and then the second refrigerant is cooled by the room temperature water to reduce the output temperature of the second heat pump circulation channel.

[0047] The embodiment of the present invention introduces a heat matching adjustment module to achieve temperature stabilization of the second refrigerant in the second heat pump circulation channel, thereby ensuring high circulation efficiency of the heat pump system, and ultimately ensuring that the horizontal steam generator can continuously generate high-quality steam, thereby improving the stability and efficiency of the steam supply system.

[0048] Optionally, the horizontal steam generator 22 includes a first heat exchange tube and a second heat exchange tube, and the second heat exchange tube is arranged in parallel with the first heat exchange tube; the first heat exchange tube is used to pass the high-temperature second refrigerant when the heat pump module provides heating, and the second heat exchange tube is used to pass the high-temperature molten salt when the molten salt energy storage module provides heating.

[0049] Among them, the first heat exchange tube and the second heat exchange tube can be understood as a group of heat exchange tubes arranged in parallel. The first heat exchange tube and the second heat exchange tube have the same heating effect and are independent of each other.

[0050] Specifically, the horizontal steam generator 22 has two independent heat exchange channels, namely a first heat exchange tube and a second heat exchange tube. Depending on the heat exchange medium supplied, the softened water in the horizontal evaporator 22 is heated by the first heat exchange tube or the second heat exchange tube to produce steam.

[0051] Optionally, the evaporative condenser 13 is provided with a first channel 131, a second channel 132 and a third channel 133 which are isolated from each other; the refrigerant in the first heat pump circulation system flows in the first channel 131; the refrigerant in the second heat pump circulation system flows in the second channel 132; the third channel 133 is used to pass normal temperature water or heated water; the refrigerant in the second channel 131 spontaneously exchanges heat with the refrigerant flowing through the first channel 132 and / or the water in the third channel 133.

[0052] The first channel 131, the second channel 132 and the third channel 133 can be understood as a group of heat exchange channels in the evaporative condenser. The embodiment of the present invention does not limit the specific structure of the evaporative condenser. The embodiment of the present invention only provides an optional technical solution and should not be understood as a limitation of the present invention. The first channel 131 is used to circulate the first refrigerant, the second channel 132 is used to circulate the second refrigerant, and the third channel 133 is used to circulate normal temperature water or heated water.

[0053] Specifically, when the ambient temperature is suitable, the first channel 131 and the second channel 132 are opened, and the first refrigerant in the first heat pump circulation system and the second refrigerant in the second heat pump circulation system perform heat exchange in the evaporative condenser 13; when the ambient temperature is low or high, when the first channel 131, the second channel 132 and the third channel 133 are opened, while the first refrigerant and the second refrigerant perform heat exchange, the temperature of the second refrigerant is adjusted by water of different temperatures in the third channel 133.

[0054] Figure 21 is a flow chart of a method for controlling air source steam supply based on a horizontal steam generator provided in an embodiment of the present invention. The method is implemented based on the air source steam supply system based on a horizontal steam generator in the above embodiment. Figure 2 As shown, the method includes:

[0055] S110, starting the evaporator to absorb heat from the environment through the first refrigerant in a low-temperature and low-pressure state, and changing the first refrigerant into a low-pressure gas state.

[0056] Specifically, when the evaporator is started, low-temperature and low-pressure refrigerant flows through the internal pipe of the evaporator. Since the temperature of the refrigerant in the evaporator is lower than the ambient temperature, the refrigerant absorbs heat from the environment.

[0057] S120, starting the first compression pump to compress the low-pressure gaseous first refrigerant to change the first refrigerant into a high-temperature and high-pressure state.

[0058] Specifically, when the first compression pump is started, the high-temperature and low-pressure refrigerant passing through the evaporator is compressed, and the pressure of the refrigerant increases significantly, and its temperature also increases accordingly.

[0059] S130, and releasing the heat of the first refrigerant in a high-temperature and high-pressure state through the evaporative condenser to perform heat exchange, thereby changing the first refrigerant to a low-temperature and high-pressure state.

[0060] Specifically, the first refrigerant in a high temperature and high pressure state performs heat exchange with the second refrigerant fluid in the second heat pump circulation channel in the evaporative condenser. After the heat exchange, the pressure of the first refrigerant remains in a high pressure state, but the temperature is significantly reduced. Therefore, the first refrigerant is transformed from a high temperature and high pressure state to a low temperature and high pressure state.

[0061] S140, opening the first expansion valve to expand the first refrigerant in a low-temperature and high-pressure state to an evaporation pressure, so that the first refrigerant returns to a low-temperature and low-pressure state.

[0062] Specifically, the system controller or sensor opens the first expansion valve according to the preset refrigeration demand and the refrigerant state. When the first refrigerant passes through the first expansion valve, due to the throttling effect of the valve, the flow rate of the first refrigerant will increase, and its pressure will decrease rapidly, and part of the refrigerant will be vaporized, so that the temperature of the refrigerant is further reduced.

[0063] S150, starting the evaporative condenser to absorb the heat of the first refrigerant in the high temperature and high pressure state in the first heat pump circulation channel through the second refrigerant in the low temperature and low pressure state to perform heat exchange, and changing the second refrigerant into a low pressure gas state.

[0064] Specifically, when the first refrigerant in a high-temperature and high-pressure state passes through the first channel of the evaporative condenser, it will exchange heat with the second refrigerant in the second channel (i.e., the second refrigerant in a low-temperature and low-pressure state). After the heat exchange, the second refrigerant changes from a low-temperature and low-pressure gas-liquid two-phase state to a low-pressure vapor state.

[0065] S160, start the second compression pump to compress the second refrigerant in the high-temperature and low-pressure state, change the second refrigerant to the high-temperature and high-pressure state, and perform heat exchange between the second refrigerant in the high-temperature and high-pressure state and softened water through a horizontal steam generator to change the second refrigerant to the low-temperature and high-pressure state, so that the softened water evaporates to form low-pressure steam.

[0066] Specifically, the second compression pump is started to compress the second refrigerant in a high-temperature and low-pressure state, and the pressure of the second refrigerant increases significantly, and its temperature also increases accordingly. The second refrigerant in a high-temperature and high-pressure state exchanges heat with softened water in a horizontal steam generator. In this process, the second refrigerant releases heat to the softened water, causing its temperature to increase and evaporate to form low-pressure steam. At the same time, the second refrigerant itself loses heat and its temperature decreases, turning into a low-temperature and high-pressure state.

[0067] S170, opening the second expansion valve to expand the second refrigerant in a low-temperature and high-pressure state to an evaporation pressure, so that the second refrigerant returns to a low-temperature and low-pressure state.

[0068] Specifically, when the second refrigerant passes through the second expansion valve, the pressure of the second refrigerant drops sharply and changes from a low-temperature and high-pressure liquid state to a low-temperature and low-pressure gas-liquid two-phase state. As the pressure drops, the temperature will further drop.

[0069] The embodiment of the present invention realizes preliminary absorption of heat from a low-temperature environment through the evaporator, the first compression pump, the evaporative condenser and the first expansion valve in the first heat pump circulation channel, and then further increases the temperature of the second refrigerant through the evaporative condenser, the second compression pump and the second expansion valve in the second heat pump circulation channel to meet the use requirements of the horizontal evaporator. The second refrigerant directly heats the softened water in the horizontal evaporator to form water vapor, thereby improving the heat exchange efficiency of the steam supply system and ensuring the steam production and quality in a low-temperature environment.

[0070] Optionally, the steam supply system also includes a heat matching and regulating circulation channel, which includes a circulation pump, a water pump, a second heat exchanger, and a temperature sensor; the water pump, the second heat exchanger, and the evaporative condenser are connected in sequence through pipelines; the heat exchanger is also connected to the molten salt energy storage module through the circulation pump; the temperature sensor is arranged at the outlet of the second channel of the evaporative condenser; the heat matching and regulating module includes the circulation pump in the molten salt energy storage module, and also includes a water pump, a second heat exchanger, and a temperature sensor. In S150, the evaporative condenser is started to absorb the heat of the first refrigerant in the high temperature and high pressure state in the first heat pump circulation channel through the second refrigerant in the low temperature and low pressure state to perform heat exchange, and before changing the second refrigerant to a low temperature gas state, the following steps are included:

[0071] S147. Obtain the temperature at the outlet of the second channel of the evaporative condenser through a temperature sensor.

[0072] Specifically, the temperature at the outlet of the second channel represents the output temperature of the low-temperature gaseous second refrigerant in the first heat pump circulation channel. The controller sends a request signal to the temperature sensor periodically or as needed. After receiving the request signal, the temperature sensor immediately measures the current temperature and converts the measurement result into an electrical signal, which is transmitted to the system controller for subsequent processing and analysis.

[0073] S148. When the temperature at the outlet of the second channel of the evaporative condenser is lower than the first preset temperature, turn on the water pump to input water into the second heat exchanger, and exchange heat between the molten salt circulation channel and the water through the second heat exchanger to increase the temperature of the water, so that the second refrigerant in the evaporative condenser absorbs heat to match the heat of the water in the regulating module for heat exchange, thereby increasing the temperature of the second refrigerant.

[0074] Among them, the first preset temperature is lower than the second preset temperature, and the first preset temperature can be understood as the minimum temperature required for the second refrigerant in the evaporative condenser to enter the compressor (for example, the first preset temperature can be the temperature when the second refrigerant is superheated by 5°C); the second heat exchanger can be understood as a dual-channel heat exchange device, in which one channel is used to pass normal temperature water, and the other channel is used to pass heat exchange medium to change the temperature of normal temperature water.

[0075] Specifically, when the temperature at the outlet of the second channel of the evaporative condenser is lower than the first preset temperature, it indicates that the external environment temperature is too low and the first heat pump cannot provide the heat required by the second heat pump. The normal temperature water input by the water pump is heated by the second heat exchanger, and then the heated water is passed into the third channel of the evaporative condenser to exchange heat with the second refrigerant in the first channel, thereby increasing the temperature of the second refrigerant to be higher than the first preset temperature.

[0076] It should be noted that the second heat exchanger can heat the normal temperature water in any manner, including but not limited to using high temperature molten salt, etc., and the embodiment of the present invention does not limit this, but when using high temperature molten salt to heat the normal temperature water in the second heater, the corresponding heating circuit should be adaptively added. Exemplarily, in the embodiment of the present invention, the molten salt energy storage module also heats the normal temperature water through the circulation pump and the second heat exchanger, and the one-way valve is adaptively added to ensure that the heating circuit does not affect the heating of the horizontal evaporator.

[0077] S149. When the temperature at the second channel outlet of the evaporative condenser is higher than the second preset temperature, turn on the water pump to pass normal temperature water into the evaporative condenser. The water in the heat matching adjustment module in the evaporative condenser absorbs the heat of the second refrigerant to perform heat exchange, thereby reducing the temperature of the second refrigerant.

[0078] The second preset temperature may be understood as the maximum temperature required for the second refrigerant in the evaporative condenser to enter the compressor (for example, the second preset temperature may be the temperature when the second refrigerant is superheated by 10° C.).

[0079] Specifically, when the temperature at the outlet of the second channel of the evaporative condenser is higher than the second preset temperature, it indicates that the external environment temperature is high and the first heat pump provides too much heat. Normal temperature water is introduced into the third channel of the evaporative condenser by a water pump to exchange heat with the second refrigerant in the first channel, thereby reducing the temperature of the second refrigerant to be lower than the second preset temperature.

[0080] The embodiment of the present invention monitors the temperature at the outlet of the second channel of the evaporative condenser. When the temperature of the second refrigerant is not within the first preset temperature and the second preset temperature range, the temperature of the second refrigerant is adjusted by the heat exchange medium (such as normal temperature water and heating water) in the third channel to balance the heat generated by the first heat pump and the heat required by the second heat pump.

[0081] Figure 3 A flow chart of another air source steam supply control method based on a horizontal steam generator provided in an embodiment of the present invention, referring to Figure 3 , the air source steam supply control method based on the above embodiment is refined or optimized. Specifically, the above steam heat pump system also includes a molten salt circulation channel, the molten salt circulation channel includes a horizontal steam generator in the second heat pump circulation channel, and also includes a molten salt energy storage tank and a circulation pump; the horizontal steam generator, the lava energy storage tank and the circulation pump are circulated and connected in sequence through pipelines; a heater is provided in the molten salt energy storage tank; the molten salt energy storage tank is used to store high-temperature molten salt as a heat energy carrier; the working process of the supply system also includes a second period, which is a period of power restriction, peak power consumption or an outside temperature lower than the first temperature.

[0082] Among them, the first temperature can be understood as the highest temperature that affects the economic efficiency of the heat pump operation. For example, the first temperature can be -30°C. When the external ambient temperature is -30°C, the working efficiency and economy of the air source heat pump are greatly reduced. At this time, the heat pump stops and the horizontal evaporator uses molten salt to heat and generate steam.

[0083] For details not yet provided in this embodiment, please refer to the previous embodiment.

[0084] like Figure 3 As shown, another air source steam supply control method based on a horizontal steam generator provided by an embodiment of the present invention includes the following steps:

[0085] During the first period, the method further includes:

[0086] S210, turning on the heater to heat the molten salt to a predetermined temperature, or to maintain the temperature of the molten salt.

[0087] The predetermined temperature may be understood as the minimum temperature at which the molten salt needs to be heated, which is determined based on the type of molten salt and the heating demand in the second period.

[0088] Specifically, when the current time period is the first time period, while the heat pump system supplies heat to the horizontal steam generator, the heater in the molten salt energy storage tank is turned on to heat the molten salt energy storage and maintain the molten salt temperature in the molten salt energy storage tank always higher than the predetermined temperature.

[0089] During the second period, the method further comprises:

[0090] S220, start the circulation pump to drive the molten salt stored in the molten salt energy storage module to perform heat exchange with the softened water in the horizontal steam generator, so that the softened water evaporates to form low-pressure steam.

[0091] Specifically, when the current time period is the second time period, the valve of the first heat exchange tube between the heat pump circulation and the horizontal evaporator is closed, and the circulation pump is turned on, so that the high-temperature lava in the molten salt energy storage tank heats the softened water through the second heat exchange tube of the horizontal evaporator, and then the softened water evaporates to form low-pressure steam.

[0092] The embodiment of the present invention provides another heating method for the horizontal evaporator by setting up a molten salt circulation channel. When there is power cut, peak power consumption or extremely low external ambient temperature, and the heat pump operation is not economical, the heat pump circulation is replaced to supply heat to the horizontal steam generator, thereby further improving the stability of the steam supply to the horizontal evaporator.

[0093] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0094] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air source steam supply system based on a horizontal steam generator, characterized in that: including a first heat pump circulation channel and a second heat pump circulation channel; The first heat pump circulation channel comprises an evaporator, a first compression pump, an evaporative condenser and a first expansion valve which are circulated and connected in sequence through a pipeline, and a first refrigerant flows in the first heat pump circulation channel; The evaporator is used to absorb heat from the environment through the first refrigerant of low temperature and low pressure, and change the first refrigerant into a low-pressure gas state; The first compression pump is used to compress the first refrigerant in a low-pressure gas state to change the first refrigerant into a high-temperature and high-pressure state; The evaporative condenser is used to release the heat of the first refrigerant in a high-temperature and high-pressure state to perform heat exchange, thereby changing the first refrigerant to a low-temperature and high-pressure state; The first expansion valve is used to expand the first refrigerant in a low-temperature and high-pressure state to an evaporation pressure, so as to restore the first refrigerant to a low-temperature and low-pressure state; The second heat pump circulation channel includes the evaporative condenser in the first heat pump circulation channel, and also includes a second compression pump, a horizontal steam generator and a second expansion valve; the evaporative condenser, the second compression pump, the horizontal steam generator and the second expansion valve are sequentially circulated and connected through a pipeline; a second refrigerant flows in the second heat pump circulation channel; The evaporative condenser is also used to absorb the heat of the first refrigerant in the high temperature and high pressure state in the first heat pump circulation channel through the second refrigerant in the low temperature and low pressure state to perform heat exchange, thereby changing the second refrigerant into a low pressure gas state; The second compression pump is used to compress the second refrigerant in a low-pressure gas state to change the second refrigerant into a high-temperature and high-pressure state; The horizontal steam generator contains softened water, and the horizontal steam generator is used to perform heat exchange between the second refrigerant in a high-temperature and high-pressure state and the softened water, so as to change the second refrigerant into a low-temperature and high-pressure state, so that the softened water evaporates to form low-pressure steam; The second expansion valve is used to expand the second refrigerant in a low-temperature and high-pressure state to an evaporation pressure, so as to restore the second refrigerant to a low-temperature and low-pressure state.

2. The steam supply system according to claim 1, characterized in that: The first heat pump circulation channel also includes an economizer, which includes an intermediate expansion valve and a first heat exchanger; the first input end of the first heat exchanger is connected to the evaporative condenser, and the first output end is connected to the first expansion valve and the intermediate expansion valve respectively; the output end of the intermediate expansion valve is connected to the second input end of the first heat exchanger, and the second output end of the first heat exchanger is connected to the first compression pump; The intermediate expansion valve is used to expand part of the first refrigerant in a low-temperature and high-pressure state to adjust the first refrigerant to a low-temperature and medium-pressure state; The first heat exchanger is used to utilize the first refrigerant in the low temperature and medium pressure state to absorb heat in the remaining part of the first refrigerant in the low temperature and high pressure state, and change part of the first refrigerant in the low temperature and medium pressure state into a medium pressure gas state.

3. The steam supply system according to claim 1, characterized in that: The horizontal steam generator comprises at least one heat exchange tube, a softened water inlet pipeline, a first output channel and / or a second output channel; A heat medium flows through the heat exchange tubes to heat the softened water to form water vapor; The softened water inlet pipeline is in communication with the horizontal steam generator for replenishing the softened water; The first output channel is in communication with the horizontal steam generator and is used to output the low-pressure steam; The second output channel is in communication with the horizontal steam generator and is provided with a compression pump for pressurizing the low-pressure steam to output high-pressure steam.

4. The steam supply system according to claim 1, characterized in that: It also includes a molten salt circulation channel, which includes the horizontal steam generator in the second heat pump circulation channel, and also includes a molten salt energy storage tank and a circulation pump, wherein the horizontal steam generator, the lava energy storage tank and the circulation pump are sequentially circulated and connected through a pipeline; a heater is provided in the molten salt energy storage tank; the molten salt energy storage tank is used to store high-temperature molten salt as a heat energy carrier; The heater is used to heat the molten salt to a predetermined temperature or maintain the temperature of the molten salt; The circulation pump is used to drive the molten salt stored in the molten salt energy storage module to perform heat exchange with the softened water in the horizontal steam generator, so that the softened water evaporates to form low-pressure steam.

5. The steam supply system according to claim 4, characterized in that: The steam supply system further includes a heat matching and regulating module, which includes the circulation pump in the molten salt energy storage module, a water pump, a second heat exchanger and a temperature sensor; The water pump, the second heat exchanger, and the evaporative condenser are connected in sequence through pipelines; The water pump is used to input water into the second heat exchanger; The second heat exchanger is also in communication with the molten salt circulation channel, and is used to exchange heat between the molten salt circulation channel and water to increase the temperature of the water; The temperature sensor is arranged at the outlet of the second channel of the evaporative condenser, and is used to detect and obtain the temperature at the outlet of the second channel of the evaporative condenser; The evaporative condenser is also used for absorbing the heat of the water in the heat matching adjustment module through the second refrigerant in a low-temperature and low-pressure state to perform heat exchange, thereby changing the second refrigerant into a low-pressure gas state.

6. The steam supply system according to claim 3, characterized in that: The horizontal steam generator comprises a first heat exchange tube and a second heat exchange tube, wherein the second heat exchange tube is arranged in parallel with the first heat exchange tube; The first heat exchange tube is used to pass a high-temperature second refrigerant when the heat pump module provides heat, and the second heat exchange tube is used to pass a high-temperature molten salt when the molten salt energy storage module provides heat.

7. The steam supply system according to claim 1, characterized in that: The evaporative condenser is provided with a first channel, a second channel and a third channel which are isolated from each other; The refrigerant in the first heat pump circulation system flows through the first channel; The refrigerant in the second heat pump circulation system flows through the second channel; The third channel is used to pass normal temperature water or heated water; The refrigerant in the second channel spontaneously exchanges heat with the refrigerant flowing through the first channel and / or the water in the third channel.

8. An air source steam supply control method based on a horizontal steam generator, characterized in that: Applicable to an air source steam supply system based on a horizontal steam generator according to any one of claims 1 to 7, wherein the working process of the supply system includes a first period, and the first period is a low electricity consumption period; During the first period, the method includes: Starting the evaporator to absorb heat from the environment through the first refrigerant in a low-temperature and low-pressure state, thereby changing the first refrigerant into a low-temperature gas state; Starting the first compression pump to compress the first refrigerant in a low-temperature gaseous state, changing the first refrigerant to a high-temperature and high-pressure state; and releasing the heat of the first refrigerant in a high-temperature and high-pressure state through the evaporative condenser to perform heat exchange, changing the first refrigerant to a low-temperature and high-pressure state; Opening the first expansion valve to expand the first refrigerant in a low-temperature and high-pressure state to an evaporation pressure, so that the first refrigerant returns to a low-temperature and low-pressure state; Starting the evaporative condenser to absorb heat of the first refrigerant in a high-temperature and high-pressure state in the first heat pump circulation channel through the second refrigerant in a low-temperature and low-pressure state to perform heat exchange, thereby changing the second refrigerant into a low-temperature gas state; Starting the second compression pump to compress the second refrigerant in a low-temperature gaseous state to change the second refrigerant into a high-temperature and high-pressure state, and exchanging heat between the second refrigerant in a high-temperature and high-pressure state and the softened water through the horizontal steam generator to change the second refrigerant into a low-temperature and high-pressure state, so that the softened water evaporates to form low-pressure steam; The second expansion valve is opened to expand the second refrigerant in a low-temperature and high-pressure state to an evaporation pressure, so that the second refrigerant is restored to a low-temperature and low-pressure state.

9. The control method according to claim 8, characterized in that: The steam supply system further includes a molten salt circulation channel, the molten salt circulation channel includes the horizontal steam generator in the second heat pump circulation channel, and also includes a molten salt energy storage tank and a circulation pump; The horizontal steam generator, the lava energy storage tank and the circulating pump are cyclically connected in sequence through a pipeline; a heater is provided in the molten salt energy storage tank; the molten salt energy storage tank is used to store high-temperature molten salt as a heat energy carrier; The working process of the supply system also includes a second period, which is a period of power cuts, peak power consumption, or an outside temperature lower than the first temperature; During the first period, the method further includes: Turning on the heater to heat the molten salt to a predetermined temperature or to maintain the temperature of the molten salt; In the second period, the method includes: starting the circulation pump to drive the molten salt stored in the molten salt energy storage module to perform heat exchange with the softened water in the horizontal steam generator, so that the softened water evaporates to form low-pressure steam.

10. The control method according to claim 9, characterized in that: The steam supply system further includes a heat matching and regulating circulation channel, which includes the circulation pump, the water pump, the second heat exchanger, and the temperature sensor; the water pump, the second heat exchanger, and the evaporative condenser are sequentially connected through pipelines; the heat exchanger is also connected to the molten salt energy storage module through the circulation pump; the temperature sensor is arranged at the outlet of the second channel of the evaporative condenser; The heat matching and regulating module includes the circulation pump in the molten salt energy storage module, and also includes a water pump, a second heat exchanger and a temperature sensor; During the first period, the method further includes: Acquiring the temperature at the outlet of the second channel of the evaporative condenser by means of the temperature sensor; When the temperature at the outlet of the second channel of the evaporative condenser is lower than the first preset temperature, the water pump is turned on to input water into the second heat exchanger, and the molten salt circulation channel is heat-exchanged with the water through the second heat exchanger to increase the temperature of the water, so that the second refrigerant in the evaporative condenser absorbs the heat of the water in the heat matching adjustment module to perform heat exchange, thereby increasing the temperature of the second refrigerant; When the temperature at the outlet of the second channel of the evaporative condenser is higher than the second preset temperature, the water pump is turned on to pass normal temperature water into the evaporative condenser, and the water in the heat matching adjustment module in the evaporative condenser absorbs the heat of the first refrigerant to perform heat exchange, thereby reducing the temperature of the second refrigerant; Wherein, the first preset temperature is lower than the second preset temperature.

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