A steam production system

Abstract

The utility model belongs to steam pipe network equipment technical field, concretely relates to a steam production system, including heat pump device, gas -liquid separator, booster unit and solid heat storage unit, set up heat pump system, absorb the low pressure water vapor of the waste heat in the wastewater that needs to carry out subsequent processing, subsequent adoption booster unit will low pressure water vapor pressurize into high pressure water vapor, effectively utilized the waste heat in the wastewater, the utility model discloses a solid heat storage unit can be configured simultaneously, can based on the time -of -use cost of power supply, selectively execute different heating, energy -storage mode, take into account the reduction production cost and the improvement energy utilization rate.

Description

Technical Field

[0001] This utility model belongs to the technical field of steam pipeline equipment, specifically relating to a steam production system. Background Technology

[0002] In current industrial production, steam is mainly supplied by natural gas boilers, which account for 30% to 50% of the total energy cost of enterprises. However, in recent years, the cost of natural gas has continued to rise, coupled with the demand for low-carbon emissions, making the high cost and high pollution problems of traditional natural gas steam boilers increasingly prominent. In addition, the thermal efficiency of natural gas boilers is generally below 90%, and there is a serious waste of low-temperature waste heat. Therefore, there is an urgent need for an efficient and low-carbon alternative, and steam heat pump technology, with its waste heat recovery and energy upgrading capabilities, has become a core direction for industrial energy-saving transformation. Utility Model Content

[0003] In view of this, the present invention provides a steam production system, which is equipped with a heat pump system to absorb the waste heat in the wastewater that needs to be further treated to produce low-pressure steam. Subsequently, a booster unit is used to pressurize the low-pressure steam into high-pressure steam, effectively utilizing the waste heat in the wastewater. At the same time, the present invention is also equipped with a solid thermal energy storage unit, which can selectively execute different heating and energy storage methods based on the time-based cost of power supply, thus taking into account both reducing production costs and improving energy utilization efficiency.

[0004] To achieve the above-mentioned technical objectives, the specific technical solution adopted by this utility model is as follows: A steam production system, comprising: The heat pump device has a heat source inlet connected to a wastewater pipe and a heat release inlet connected to boiler cold water. It absorbs the waste heat from the wastewater pipe to heat the boiler cold water into boiler hot water and low-pressure steam. The gas-liquid separator has an inlet connected to the outlet of the heat-releasing end and a liquid phase outlet connected to the inlet of the heat-releasing end, and performs gas-liquid separation between boiler hot water and low-pressure steam. The booster unit is connected to the gas phase outlet of the gas-liquid separator at its inlet, which pressurizes the low-pressure steam into high-pressure steam and introduces it into the high-pressure steam pipeline. Solid thermal storage units selectively convert electricity into heat for storage and release. The inlet of the heat release end is connected to the boiler's cold water, and the outlet of the heat release end produces high-pressure steam, which is then introduced into a high-pressure steam pipeline.

[0005] In order to regulate the steam production mode based on a minimalist set of components, a first valve is installed between the outlet of the heat release end of the solid thermal storage unit and the high-pressure steam pipeline; a second valve is installed between the outlet of the booster unit and the high-pressure steam pipeline. The steam production system is based on adjusting the power supply of the first valve, the second valve, and the solid thermal storage unit, so that the solid thermal storage unit stores heat during off-peak hours, maintains heat during normal hours, and produces steam during peak hours.

[0006] The steam production system is based on adjusting the power supply of the first valve, the second valve, and the heat pump device, so that the heat pump device produces low-pressure steam during off-peak and level electricity hours and stops working during peak electricity hours.

[0007] In order to reduce production costs and save energy while ensuring production efficiency, during off-peak electricity hours, the heat pump device is connected to its power supply, the solid thermal storage unit is connected to its thermal storage circuit, the first valve is closed, and the second valve is opened.

[0008] In order to reduce production costs and save energy while ensuring production efficiency, during normal power supply, the heat pump device is connected to its power source, the solid thermal storage unit is connected to its insulation circuit, the first valve is closed, and the second valve is opened.

[0009] In order to reduce production costs and save energy while ensuring production efficiency, during peak electricity hours, the heat pump device is connected to its power supply in an open circuit, the solid heat storage unit is connected to its heat release circuit, the first valve is opened, and the second valve is closed.

[0010] To improve the service life of solid heat exchanger units in uninterrupted operating environments, the solid heat storage unit includes: support; The outer cover is fixedly installed with the bracket; A heat insulation layer is fitted inside the outer cover; The heat storage unit, which is fitted inside the heat insulation layer, includes multiple sets of heat storage layers stacked sequentially. A heating element, installed inside the outer casing, is used to heat each of the heat storage layers via a heating wire; A heat exchange unit, mounted on the bracket, extracts heat energy from the heat storage unit based on circulating gas or heat exchange pipes; Wherein: the heat storage layer includes a refractory layer and a high heat capacity layer; the refractory layer is heat-conductingly connected to the heating part and is provided with heat exchange holes communicating with the heat exchange part; a heat buffer layer is provided between the refractory layer and the high heat capacity layer, and the heat buffer layer realizes the delayed conduction of heat energy between the refractory layer and the high heat capacity layer.

[0011] In order to enable the solid thermal storage unit to provide the temperature for directly producing high-pressure steam, the refractory layer adopts an alumina ceramic plate structure; the alumina ceramic plate is provided with heat exchange holes to facilitate the passage of heat exchange circulating gas or heat exchange pipes, and also with heating holes to facilitate the passage of heating wires; The heat buffer layer adopts a porous ceramic heat insulation board structure, with one side being attached to the alumina ceramic board structure; The high heat capacity layer adopts a MgO-Al2O3-based composite ceramic plate structure, and one side is attached to the porous ceramic heat insulation plate structure.

[0012] Specifically, the heat pump device includes: The evaporator has a heat source section connected to the wastewater pipeline and a refrigerant outlet connected to the compressor. It absorbs the wastewater heat in the wastewater pipeline based on the vaporization of the refrigerant. The compressor, with its outlet connected to the condenser, compresses the vaporized refrigerant into a liquid state; The condenser, with its heating end connected to the gas-liquid separator, heats the boiler's cold water based on the liquefied heat energy of the refrigerant, and the refrigerant outlet is connected to the expansion valve. The expansion valve vaporizes the liquid refrigerant.

[0013] Specifically, the steam production system also includes a water supply pipe; the water supply pipe is connected to the inlet of the heat release end.

[0014] To avoid pressure fluctuations and improve the stability of steam output, the booster unit includes a steam compressor and a pressure stabilizing tank; the inlet of the steam compressor is connected to the gas phase outlet of the condenser, and the outlet is connected to the high-pressure steam pipeline.

[0015] Specifically, the pressure of the low-pressure steam is 0.1 MPa; Specifically, the pressure of the high-pressure steam is 0.5 MPa.

[0016] By adopting the above technical solution, this utility model can also bring the following beneficial effects: During off-peak electricity (the low point of the tiered electricity price), the heat pump device consumes low-cost electricity to operate and produce gas, while the solid thermal storage unit can fully utilize the low-cost electricity during off-peak hours for heat storage; the power consumption per unit of steam produced is low. During peak electricity (the midpoint of the tiered electricity price), the heat pump device consumes cost-effective electricity to operate and produce gas, while the solid thermal storage unit adopts a heat preservation mode, resulting in moderate power consumption per unit of steam produced. During peak electricity (the high point of the tiered electricity price), the heat pump device is turned off, and steam is produced solely by the heat energy stored in the solid thermal storage unit; neither the heat pump device nor the solid thermal storage unit consumes electricity. This utility model adopts a solid thermal storage unit based on composite materials, which improves service life and reduces maintenance costs; Overall, this utility model, by controlling the power supply to two steam-generating devices and the opening of two valves, can ensure steam output at the lowest cost under tiered electricity consumption rules, thereby reducing the average production cost of steam. At the same time, the solid thermal storage unit has a long service life and low maintenance cost. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the composition of a steam production system according to a specific embodiment of the present utility model; Figure 2 This is a schematic diagram of the solid thermal storage unit in a specific embodiment of the present invention; Figure 3 This is a partial cross-sectional view of the solid thermal storage unit in a specific embodiment of this utility model; Figure 4 This is a partial cross-sectional view of the solid thermal energy storage unit after removing the outer cover in a specific embodiment of this utility model; The components include: 1. Heat pump unit; 11. Evaporator; 12. Compressor; 13. Condenser; 14. Expansion valve; 2. Gas-liquid separator; 3. Booster unit; 31. Steam compressor; 32. Pressure stabilizing tank; 4. Solid heat storage unit; 41. Support frame; 42. Outer cover; 43. Insulation layer; 44. Heat storage section; 441. Refractory layer; 442. Heat buffer layer; 443. High heat capacity layer; 45. Heating section; 46. Heat exchange section; 5. First valve; 6. Second valve; 7. Water supply pipe; 8. High-pressure steam pipe; 9. Wastewater pipe. Detailed Implementation

[0019] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0020] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0021] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0022] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The illustrations only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0024] In one embodiment of this utility model, a steam production system is provided, comprising: The heat pump device 1 has a heat source end inlet connected to a wastewater pipe 9 and a heat release end inlet connected to boiler cold water. It absorbs the waste heat from the wastewater pipe 9 to heat the boiler cold water into boiler hot water and low-pressure steam. Gas-liquid separator 2 has an inlet connected to the outlet of the heat-releasing end and a liquid phase outlet connected to the inlet of the heat-releasing end, which performs gas-liquid separation between boiler hot water and low-pressure steam. The booster unit 3 is connected to the gas phase outlet of the gas-liquid separator 2 at its inlet, which pressurizes the low-pressure steam into high-pressure steam and introduces it into the high-pressure steam pipeline 8. Solid thermal storage unit 4 selectively converts power into heat for storage and release. The inlet of the heat release end is connected to boiler cold water, and the outlet of the heat release end produces high-pressure steam and is introduced into high-pressure steam pipeline 8.

[0025] In this embodiment, the heat pump device 1 is a model that supports the factory's steam production needs. It has a power regulation function, and its maximum power output can independently support the factory's steam consumption requirements. The wastewater in this embodiment uses cooling water and waste steam that require softening treatment. After the softened water is heated and partially vaporized by the heat pump device 1, it is introduced into the gas-liquid separator 2. The gas-liquid separator 2 separates the low-pressure water vapor (150°C, unpressurized, generally one atmosphere, i.e., 0.1 MPa) from the hot water, and then introduces the hot water back into the heat release end of the heat pump device 1. This embodiment is equipped with a water supply pipe 7, which dynamically adjusts the flow rate of softened water delivered to the heating end of the heat pump device 1 to ensure sufficient softened water for vaporization.

[0026] The low-pressure steam separated by the gas-liquid separator 2 is fed into the booster unit 3. The booster unit 3 pressurizes the steam (0.5 MPa) to produce high-pressure steam, which is then fed into the high-pressure steam pipeline 8.

[0027] The solid thermal energy storage unit 4 in this embodiment uses industrial electricity as its energy source. It stores thermal energy by heating solid materials to a high temperature (600℃-800℃ or higher in this embodiment) and releases the thermal energy through a controllable heat exchange process (usually air or water) when needed. The solid thermal energy storage unit 4 in this embodiment is configured with three working states. The first state is to connect the heating power supply for heating and energy storage. The second state is to maintain the temperature based on a fixed power after the heat storage is completed. The third state is to disconnect the heating power supply and open the built-in heat exchange pipeline to release the stored thermal energy.

[0028] Since the solid thermal storage unit 4 generally uses heating wires to directly heat the heat storage section 44, and the solid thermal storage unit 4 in this embodiment is in a continuous working state (heat storage / insulation / heat release), the contact area between the heating wire and the heat storage material is small. This embodiment also places higher temperature requirements on the solid thermal storage material. Therefore, during long-term use and frequent mode adjustments, heat concentration easily occurs around the heating wire, causing the heat storage material to age and detach. This aging can even lead to a vicious cycle, significantly reducing the service life of the thermal storage unit. Furthermore, if the solid thermal storage material needs to be replaced due to aging, the entire unit must be replaced, resulting in extremely high costs.

[0029] In this embodiment, in order to improve the service life of the solid heat exchanger unit in a continuous operating environment, such as Figure 2-4 As shown, the solid thermal energy storage unit 4 includes: Bracket 41; The outer cover 42 is fixedly installed with the bracket 41; The heat insulation layer 43 is fitted inside the outer cover 42; The heat storage unit 44 is fitted inside the heat insulation layer 43 and includes multiple sets of heat storage layers stacked sequentially. Heating unit 45 is installed inside outer cover 42 and is used to heat each heat storage layer by electric heating wire; The heat exchange unit 46 is mounted on the bracket 41 and extracts heat energy from the heat storage unit 44 based on circulating gas or heat exchange pipes. The heat storage layer includes a refractory layer 441 and a high heat capacity layer 443. The refractory layer 441 is heat-conductingly connected to the heating part 45 and is provided with heat exchange holes that communicate with the heat exchange part 46. A heat buffer layer 442 is provided between the refractory layer 441 and the high heat capacity layer 443, and the heat buffer layer 442 realizes the delayed conduction of heat energy between the refractory layer 441 and the high heat capacity layer 443.

[0030] In this embodiment, the heat storage unit is produced by directly connecting the heat exchange pipe to the heat storage unit 44 to produce high-pressure steam, or by indirectly heating with circulating gas to produce high-pressure steam.

[0031] In order to enable the solid thermal storage unit 4 to provide the temperature for directly producing high-pressure steam, the refractory layer 441 adopts an alumina ceramic plate structure; the alumina ceramic plate is provided with heat exchange holes to facilitate the passage of heat exchange circulating gas or heat exchange pipes, and also with heating holes to facilitate the passage of heating wires. The heat buffer layer 442 adopts a porous ceramic heat insulation board structure, with one side being attached to the alumina ceramic board structure. The high heat capacity layer 443 adopts a MgO-Al2O3 based composite ceramic plate structure, which is attached to the porous ceramic heat insulation plate structure on one side.

[0032] In this embodiment, the heat storage unit 44 is made of composite material. The composite material includes a high refractory layer 441, a delayed conduction layer, and a high heat capacity layer 443. During the mode conversion process of the solid thermal storage unit 4, a certain temperature difference is artificially created between the high refractory layer 441 and the high heat capacity layer 443 to buffer the process, so that the heat is concentrated in the refractory layer 441. The refractory layer 441 itself has strong high temperature resistance, which improves the life of the solid thermal storage unit to a certain extent. At the same time, this embodiment uses a delayed conduction layer to heat the high heat capacity layer 443, which has a higher specific heat capacity. This can prevent the high heat capacity layer 443 from heating too quickly and extend its service life.

[0033] Data support: The long-term operating temperature of alumina ceramics is 1000–1500 °C, the specific heat capacity is 750–900 J / (kg·K), and the thermal conductivity is 15–30 W / (m·K); porous ceramics (Al2O3–SiO2) can be used in the range of 800–1600 °C, with a thermal conductivity of 0.1–1 W / (m·K). In this embodiment, the thickness of the porous ceramics is much smaller than the thickness of the insulation layer 43, generally 3-5 mm; MgO-Al2O3 based composite ceramic plate has a specific heat capacity of 930 J / (kg·K).

[0034] In this embodiment, in order to adjust the steam production mode based on a minimal set of supporting components, a first valve 5 is provided between the outlet of the heat release end of the solid thermal storage unit 4 and the high-pressure steam pipeline 8; a second valve 6 is provided between the outlet of the booster unit 3 and the high-pressure steam pipeline 8. Because the solid energy storage material of the solid thermal storage unit 4 has a high temperature, the soft water that is introduced can be quickly and completely vaporized after heat exchange. In this embodiment, the flow rate of soft water introduced into the solid thermal storage unit 4 is controlled and a pressure relief valve is set. When the steam reaches 150°C and reaches the opening pressure of the pressure relief valve (the opening pressure is set to 0.5 MPa, which is the same as the high-pressure steam output by the booster unit 3 at the end of the heat pump device 1), it is introduced into the high-pressure steam pipeline 8.

[0035] In this embodiment, both the heat pump device 1 and the solid heat storage device are equipped with flow sensors on the water supply pipes 7. The soft water temperature is controlled at 20°C, which facilitates the control of the heat pump system and the solid heat storage unit 4 to produce water vapor at a specific pressure and temperature.

[0036] In this embodiment, the heat exchange ends of the evaporator 11 and condenser 13 of the heat pump device 1, as well as the heat storage medium and heat exchange end outlet of the solid heat storage device, are all equipped with temperature sensors. The heat exchange end outlet of the solid heat storage device is also equipped with a flow sensor.

[0037] Based on the data from the above sensors, the steam production system in this embodiment adjusts the water inlet volume of the water supply pipe 7, the power of the heat pump device 1, and the power of the solid heat storage device to achieve precise control over the flow rate, pressure, and temperature of the produced steam.

[0038] In this embodiment, both the first valve 5 and the second valve 6 are shut-off valves. When the heat pump device 1 is used for steam production, the first valve 5 is closed and the second valve 6 is open. When the solid thermal storage unit 4 is used for steam production, the first valve 5 is open and the second valve 6 is closed to avoid the generation of negative pressure.

[0039] In the capital embodiment, in order to reduce production costs and save energy while ensuring production efficiency, the steam production system adjusts the power supply and power of the first valve 5, the second valve 6 and the solid thermal storage unit 4 so that the solid thermal storage unit 4 stores heat during off-peak hours, keeps the temperature during normal hours, and produces steam during peak hours.

[0040] The steam production system is based on regulating the power supply and power of the first valve 5, the second valve 6, and the heat pump device 1, so that the heat pump device 1 produces low-pressure steam during off-peak and flat electricity periods and stops working during peak electricity periods.

[0041] This embodiment of the hot steam production system has three operating modes: During off-peak hours, heat pump unit 1 consumes low-cost electricity to produce water vapor, and solid thermal storage unit 4 consumes low-cost electricity for energy storage. When the power supply is normal, the heat pump unit 1 consumes low-cost electricity to produce water vapor, and the solid thermal storage unit 4 consumes only a very low amount of electricity for heat preservation. During peak electricity hours, heat pump unit 1 stops operating, and solid thermal storage unit 4 releases heat to produce water vapor.

[0042] The control methods for these three modes are as follows: During off-peak hours, the heat pump device 1 is connected to its power supply, the solid thermal storage unit 4 is connected to its thermal storage circuit, the first valve 5 is closed, and the second valve 6 is opened.

[0043] When the power is normal, the heat pump device 1 is connected to its power source, the solid heat storage unit 4 is connected to its insulation circuit, the first valve 5 is closed, and the second valve 6 is opened.

[0044] During peak power hours, the heat pump unit 1 is connected to its power supply in an open circuit, the solid heat storage unit 4 is connected to its heat release circuit, the first valve 5 is opened, and the second valve 6 is closed.

[0045] Specifically, the heat pump device 1 includes: Evaporator 11, heat source section connected to wastewater pipe 9, refrigerant outlet connected to compressor 12, absorbs waste heat from wastewater in wastewater pipe 9 based on refrigerant vaporization; The compressor 12 is connected to the condenser 13 at its outlet, which compresses the vaporized refrigerant into a liquid state. Condenser 13, heating end connected to gas-liquid separator 2, heating boiler cold water based on refrigerant liquefaction heat energy, refrigerant outlet connected to expansion valve 14; Expansion valve 14 vaporizes the liquid refrigerant.

[0046] To avoid pressure fluctuations and ensure the stability of high-pressure steam output, the booster unit 3 includes a steam compressor 31 and a pressure stabilizing tank 32; the inlet of the steam compressor 31 is connected to the gas phase outlet of the condenser 13, and the outlet is connected to the high-pressure steam pipeline 8.

[0047] The following description, based on a factory system, further illustrates this embodiment. 1. System Composition Low-pressure steam heat pump unit: Utilizes industrial wastewater at around 55℃ to generate low-pressure steam at around 0.1MPa; Steam booster unit 3: It uses multi-stage compression technology to boost low-pressure steam to high-pressure steam above 0.5MPa; Solid-state electric energy storage device: It stores heat during off-peak hours at night and releases the heat during the day to assist in steam generation, thereby achieving peak shaving and valley filling and economic optimization.

[0048] 2. Control Strategy (1) Off-peak electricity: 23:00-7:00 the next day During this period, the "micro-pressure steam heat pump unit + steam booster unit 3" system is activated, and the solid thermal storage unit 4 is in thermal storage mode. V1 (representing the first valve 5, the same below) is closed, and V2 (representing the second valve 6, the same below) is open. In this control mode, the solid thermal storage unit 4 can make full use of the low electricity price during off-peak hours for thermal storage, while not affecting the production of high-pressure steam.

[0049] (2) Regular electricity: 7:00-11:00, 14:00-18:00 During this period, the "low-pressure steam heat pump unit + steam booster unit 3" system is activated, while the solid thermal storage unit 4 is in standby mode, with V1 off and V2 on. In this control mode, the "low-pressure steam heat pump unit + steam booster unit 3" operates at full power to meet the high-pressure steam requirements for production. At the same time, the electricity price is relatively cheap, so the solid thermal storage unit 4 only operates in heat preservation mode and does not produce high-pressure steam.

[0050] (3) Peak hours: 11:00-14:00, 18:00-23:00 During this period, due to higher electricity prices, all "micro-pressure steam heat pump units + steam booster units 3" are shut down, and only solid thermal storage unit 4 is turned on for heat release, with V1 on and V2 off. This control mode avoids using the high-energy-consuming "micro-pressure steam heat pump units + steam booster units 3" system during peak electricity periods when electricity prices are too high, and instead utilizes the heat stored by solid thermal storage unit 4 at night to produce high-pressure steam.

[0051] 3. Effects This embodiment achieves a balance between high efficiency, low carbon emissions, and economic efficiency in industrial steam production by integrating a micro-pressure steam heat pump, a booster unit 3, and solid-state electric energy storage technology. It overcomes the pressure limitations and reliance on a single energy source inherent in traditional heat pumps, providing a replicable and high-yield solution for industrial energy-saving retrofits and offering a standardized solution for energy-saving transformations in the industrial sector.

[0052] This embodiment combines heat pump waste heat recovery, steam pressurization and electric energy storage technology for the first time, breaking through the limitation of a single heat source and improving the overall energy utilization rate by more than 40%. This embodiment achieves a system energy efficiency ratio (COP) of over 2.0 by dynamically adjusting the heat pump frequency and energy storage module output by collecting real-time operating temperature and pressure parameters.

[0053] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A steam production system, characterized in that, include: The heat pump device has a heat source inlet connected to a wastewater pipe and a heat release inlet connected to boiler cold water. It absorbs the waste heat from the wastewater pipe to heat the boiler cold water into boiler hot water and low-pressure steam. The gas-liquid separator has an inlet connected to the outlet of the heat-releasing end and a liquid phase outlet connected to the inlet of the heat-releasing end, and performs gas-liquid separation between boiler hot water and low-pressure steam. The booster unit is connected to the gas phase outlet of the gas-liquid separator at its inlet, which pressurizes the low-pressure steam into high-pressure steam and introduces it into the high-pressure steam pipeline. Solid thermal storage units selectively convert electricity into heat for storage and release. The inlet of the heat release end is connected to the boiler's cold water, and the outlet of the heat release end produces high-pressure steam which is then introduced into a high-pressure steam pipeline.

2. The steam production system according to claim 1, characterized in that, A first valve is installed between the outlet of the heat dissipation end of the solid thermal storage unit and the high-pressure steam pipeline; a second valve is installed between the outlet of the booster unit and the high-pressure steam pipeline. The steam production system is based on adjusting the power supply of the first valve, the second valve, and the solid thermal storage unit, so that the solid thermal storage unit stores heat during off-peak hours, maintains heat during normal hours, and produces steam during peak hours.

3. The steam production system according to claim 2, characterized in that, The steam production system is based on adjusting the power supply of the first valve, the second valve, and the heat pump device, so that the heat pump device produces low-pressure steam during off-peak and flat electricity hours and stops working during peak electricity hours. During off-peak electricity hours, the heat pump device is connected to its power source, the solid thermal storage unit is connected to its thermal storage circuit, the first valve is closed, and the second valve is opened. When the power is normal, the heat pump device is connected to its power source, the solid thermal storage unit is connected to its insulation circuit, the first valve is closed, and the second valve is open. During peak power hours, the heat pump device is connected to its power supply in an open circuit, the solid thermal storage unit is connected to its heat release circuit, the first valve is opened, and the second valve is closed.

4. The steam production system according to claim 1, characterized in that, The solid thermal storage unit includes: support; The outer cover is fixedly installed with the bracket; A heat insulation layer is fitted inside the outer cover; The heat storage unit, which is fitted inside the heat insulation layer, includes multiple sets of heat storage layers stacked sequentially. A heating element, installed inside the outer casing, is used to heat each of the heat storage layers via a heating wire; A heat exchange unit, mounted on the bracket, extracts thermal energy from the heat storage unit based on circulating gas or heat exchange pipes; Wherein: the heat storage layer includes a refractory layer and a high heat capacity layer; the refractory layer is heat-conductingly connected to the heating part and is provided with heat exchange holes communicating with the heat exchange part; a heat buffer layer is provided between the refractory layer and the high heat capacity layer, and the heat buffer layer realizes the delayed conduction of heat energy between the refractory layer and the high heat capacity layer.

5. The steam production system according to claim 4, characterized in that, The refractory layer adopts an alumina ceramic plate structure; the alumina ceramic plate is provided with heat exchange holes to facilitate the passage of heat exchange circulating gas or heat exchange pipes, and also with heating holes to facilitate the passage of heating wires. The heat buffer layer adopts a porous ceramic heat insulation board structure, with one side being attached to the alumina ceramic board structure; The high heat capacity layer adopts a MgO-Al2O3-based composite ceramic plate structure, and one side is attached to the porous ceramic heat insulation plate structure.

6. The steam production system according to claim 1, characterized in that, The heat pump device includes: The evaporator has a heat source section connected to the wastewater pipeline and a refrigerant outlet connected to the compressor. It absorbs the wastewater heat in the wastewater pipeline based on the vaporization of the refrigerant. The compressor, with its outlet connected to the condenser, compresses the vaporized refrigerant into a liquid state; The condenser, with its heating end connected to the gas-liquid separator, heats the boiler's cold water based on the liquefied heat energy of the refrigerant, and the refrigerant outlet is connected to the expansion valve. The expansion valve vaporizes the liquid refrigerant.

7. The steam production system according to claim 6, characterized in that, The steam production system also includes a water supply pipe; the water supply pipe is connected to the inlet of the heat release end.

8. The steam production system according to claim 6, characterized in that, The booster unit includes a steam compressor and a pressure stabilizing tank; the inlet of the steam compressor is connected to the gas phase outlet of the condenser, and the outlet is connected to the high-pressure steam pipeline.

9. The steam production system according to claim 1, characterized in that, The pressure of the low-pressure steam is 0.1 MPa; the pressure of the high-pressure steam is 0.5 MPa.

Images