A steam mixing system and method based on multi-stage heat exchange and self-power supply

Abstract

The application discloses a steam mixing system and method based on multi-stage heat exchange and self-energy supply, and relates to the technical field of steam parameter adjustment and heat energy cascade utilization. The system comprises a high-temperature steam generation module, a high-temperature heat pump module, a multi-stage heat exchange module, a mixing module and a control module. The high-temperature steam generation module outputs high-temperature steam. A preheating heat exchanger of the multi-stage heat exchange module preheats a to-be-processed working medium. The high-temperature heat pump outputs low-temperature steam through an inverse Carnot cycle. A built-in ejector in the mixing module completes two-way steam mixing to generate medium-temperature steam by relying on the kinetic energy of the high-temperature steam. The control module monitors the steam temperature in real time and adjusts two-way flow control valves to stabilize the output. The system can be additionally provided with a flash evaporator or a terminal superheating heat exchanger to change the steam working condition and be matched with a corresponding operation method. The system is suitable for industrial scenes, such as food processing, chemical synthesis and textile printing and dyeing, which need stable medium-temperature steam, can recycle high-temperature waste heat to improve the heat energy utilization rate, and can save mixed power equipment to reduce operation energy consumption.

Description

Technical Field

[0001] This invention relates to the field of steam parameter regulation and thermal energy cascade utilization technology, specifically to a mixing and regulation device for steam at different temperature levels. Background Technology

[0002] In industrial settings such as food processing, chemical synthesis, and textile printing and dyeing, stable medium-temperature steam is often required as a process heat source. Existing technologies for obtaining medium-temperature steam mainly include directly generating steam using boilers configured with corresponding parameters, throttling and cooling high-temperature, high-pressure steam before use, or blending two streams of steam at different temperature levels. These various steam supply solutions are suitable for different production scales and heat usage conditions, providing basic thermal energy support for industrial production.

[0003] Existing steam mixing solutions still have several shortcomings in practical applications. Most mixing systems lack waste heat recovery and cascade heat exchange structures, resulting in ineffective utilization of the sensible heat carried by high-temperature steam. Direct participation of high-grade energy in mixing leads to energy waste, and the overall thermal efficiency of the system has room for improvement. Conventional steam blending processes rely on power pumps to drive fluid mixing, consuming additional external electricity and increasing the cost and workload of routine equipment maintenance. The output parameter control methods of some steam mixing systems are relatively simple, making it difficult to maintain the target steam output temperature stably for extended periods and to flexibly meet the differentiated requirements of different processes regarding steam dryness and superheat. Summary of the Invention

[0004] The purpose of this invention is to provide a steam mixing system and method based on multi-stage heat exchange and self-powered energy supply, which solves the problems of insufficient utilization of thermal energy in existing steam mixing systems, reliance on external power equipment for the mixing process, and high operating energy consumption.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a steam mixing system based on multi-stage heat exchange and self-powered energy supply, comprising:

[0007] The system comprises a high-temperature steam generating module, a high-temperature heat pump module, a multi-stage heat exchange module, a mixing module, and a control module. The steam outlet of the high-temperature steam generating module is connected to the high-temperature inlet of the multi-stage heat exchange module. The high-temperature inlet of the multi-stage heat exchange module is connected to the first steam inlet of the mixing module. The steam outlet of the high-temperature heat pump module is connected to the second steam inlet of the mixing module. The low-temperature side of the multi-stage heat exchange module is used to connect to an external working fluid. The steam outlet of the mixing module serves as the system output. The control module is connected to the flow control valves at the two steam inlets of the mixing module to regulate the flow rate of the two steam streams.

[0008] In one possible implementation, the mixing module includes an ejector, the working fluid inlet of which is connected to a first steam inlet of the mixing module, the ejector fluid inlet of which is connected to a second steam inlet of the mixing module, and the ejector outlet of which is connected to the steam outlet of the mixing module.

[0009] In one possible implementation, the multi-stage heat exchange module includes a preheating heat exchanger, the high-temperature side inlet of which is connected to the steam outlet of the high-temperature steam generation module, the high-temperature side outlet of which is connected to the first steam inlet of the mixing module, the low-temperature side inlet of which is used to connect to an external working fluid to be processed, and the low-temperature side outlet of which is used to output the preheated working fluid.

[0010] In one possible implementation, the multi-stage heat exchange module further includes a flash evaporator, the inlet of which is connected to the steam outlet of the mixing module, and the steam outlet of which is used to output steam with increased dryness.

[0011] In one possible implementation, a terminal superheated heat exchanger is further included. The inlet of the terminal superheated heat exchanger on the side to be heated is connected to the steam outlet of the mixing module, the inlet of the terminal superheated heat exchanger on the heat source side is connected to the bypass steam outlet of the high-temperature steam generating module, and the outlet of the terminal superheated heat exchanger on the side to be heated is used to output superheated steam.

[0012] In one possible implementation, the control module includes a temperature sensor, a controller, a first flow control valve, and a second flow control valve. The temperature sensor is located at the steam outlet of the mixing module. The signal output terminal of the temperature sensor is connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the control terminals of the first flow control valve and the second flow control valve, respectively. The first flow control valve is located on the pipeline of the first steam inlet of the mixing module, and the second flow control valve is located on the pipeline of the second steam inlet of the mixing module.

[0013] In one possible implementation, the high-temperature heat pump module adopts a reverse Carnot cycle structure, the evaporator side of the high-temperature heat pump module is used to connect to an external low-temperature heat source, and the steam outlet of the condenser side of the high-temperature heat pump module is connected to the second steam inlet of the mixing module.

[0014] Secondly, the present invention provides a steam mixing method based on multi-stage heat exchange and self-powered energy supply, comprising the following steps:

[0015] High-temperature steam is generated through a high-temperature steam generation module;

[0016] High-temperature steam is introduced into the high-temperature side of the multi-stage heat exchange module to preheat the working fluid to be processed on the low-temperature side using the heat of the high-temperature steam. The cooled high-temperature steam is then transported to the mixing module.

[0017] Low-temperature steam is generated by a high-temperature heat pump module and delivered to the mixing module;

[0018] The two streams of steam are mixed inside the mixing module to form mixed steam, which is then output externally.

[0019] The control module monitors the temperature of the mixed steam in real time and adjusts the flow rate of the two steam streams accordingly to maintain a stable output steam temperature.

[0020] In one possible implementation, the steps of preheating the working fluid by introducing high-temperature steam into a multi-stage heat exchange module, generating low-temperature steam through a high-temperature heat pump module, and mixing the two streams of steam within a mixing module include:

[0021] High-temperature steam enters the high-temperature side channel of the preheating heat exchanger, and the working fluid to be treated enters the low-temperature side channel of the preheating heat exchanger. The two fluids exchange heat through the heat exchange wall. The cooled high-temperature steam flows out from the high-temperature side outlet of the preheating heat exchanger and is transported to the mixing module.

[0022] The high-temperature heat pump module operates under reverse Carnot cycle conditions, absorbing heat from an external low-temperature heat source through the evaporator side, producing low-temperature steam on the condenser side and delivering it to the mixing module;

[0023] High-temperature steam is used as the working fluid and is introduced into the working fluid inlet of the ejector. Low-temperature steam is used as the ejector fluid and is introduced into the ejector fluid inlet. The kinetic energy of the high-temperature steam is used to eject the low-temperature steam, so that the two steam streams complete momentum and heat exchange inside the ejector.

[0024] In one possible implementation, the steps of maintaining a stable output steam temperature and outputting the mixed steam include:

[0025] The temperature signal of the mixed steam is collected by a temperature sensor and transmitted to the controller. The controller adjusts the opening of the first flow control valve and the second flow control valve according to the deviation between the actual temperature and the set temperature, thereby changing the mass flow ratio of high-temperature steam and low-temperature steam.

[0026] After the mixed steam flows out of the mixing module, it enters the flash evaporator, where some of the liquid working fluid is vaporized under reduced pressure, thereby increasing the dryness of the output steam.

[0027] After the mixed steam flows out of the mixing module, it enters the heating side channel of the terminal superheater. The bypass steam output from the high-temperature steam generation module enters the heat source side channel of the terminal superheater, and the mixed steam is heated into superheated steam through heat exchange.

[0028] Compared with the prior art, the advantages of this invention are as follows:

[0029] Compared to steam mixing systems without waste heat recovery structures, this system first introduces high-temperature steam into a preheating heat exchanger within a multi-stage heat exchange module before it enters the mixing module. The high-temperature steam releases some sensible heat in the preheating heat exchanger, which is used to preheat the working fluid on the low-temperature side, achieving cascaded energy utilization. This structure can recover some of the heat carried by the high-temperature steam, reducing the direct consumption of high-grade thermal energy and improving the overall thermal efficiency of the system.

[0030] Compared to solutions that use a power pump to drive steam mixing, this system's mixing module has a built-in ejector. The ejector uses high-temperature steam as the working fluid, relying on the kinetic energy of the high-temperature steam itself to create negative pressure, thus ejecting low-temperature steam into the mixing zone to complete the mixing process. The entire mixing process does not require an additional hybrid power pump, reducing the system's external power consumption and minimizing maintenance workload from moving equipment, enabling the system to operate self-powered.

[0031] Compared to steam mixing systems with a single output form, this system is equipped with a control module that can monitor the output temperature of the mixed steam in real time. By adjusting the opening of the flow control valves at both inlets, it dynamically adjusts the mass flow ratio of high-temperature steam to low-temperature steam to maintain a stable output steam temperature. The system can also be configured with a flash evaporator or a terminal superheated heat exchanger to improve steam dryness or produce superheated steam, respectively, making it suitable for different process heat requirements and expanding the system's applicable scenarios. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a diagram illustrating the working process of a steam mixing system based on multi-stage heat exchange and self-powered energy in an embodiment of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] Example:

[0036] It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or devices.

[0037] This embodiment provides a steam mixing system based on multi-stage heat exchange and self-powered energy supply, including:

[0038] The system comprises a high-temperature steam generating module, a high-temperature heat pump module, a multi-stage heat exchange module, a mixing module, and a control module. The steam outlet of the high-temperature steam generating module is connected to the high-temperature inlet of the multi-stage heat exchange module. The high-temperature inlet of the multi-stage heat exchange module is connected to the first steam inlet of the mixing module. The steam outlet of the high-temperature heat pump module is connected to the second steam inlet of the mixing module. The low-temperature side of the multi-stage heat exchange module is used to connect to an external working fluid. The steam outlet of the mixing module serves as the system output. The control module is connected to the flow control valves at the two steam inlets of the mixing module to regulate the flow rate of the two steam streams.

[0039] Specifically, the high-temperature steam generating module can be a heat source device that produces high-temperature saturated steam; the high-temperature heat pump module can be a heat pump device that improves the heat energy quality through thermodynamic circulation; the multi-stage heat exchange module can be a combination of heat exchange units that realize multi-stage heat exchange; the mixing module can be a device that mixes two streams of steam at different temperatures; and the control module can be a control unit that regulates the steam flow rate and output temperature. For example, the high-temperature steam generating module uses a gas-fired boiler to produce high-temperature saturated steam at 160°C; the high-temperature heat pump module produces low-temperature saturated steam at 120°C; the multi-stage heat exchange module can preheat the working fluid in stages; the mixing module outputs target medium-temperature steam at 140°C; and the control module changes the mass flow rate ratio of the two streams of steam by adjusting the valve opening.

[0040] In one possible implementation, the mixing module includes an ejector, the working fluid inlet of which is connected to a first steam inlet of the mixing module, the ejector fluid inlet of which is connected to a second steam inlet of the mixing module, and the ejector outlet of which is connected to the steam outlet of the mixing module.

[0041] Specifically, the ejector can be a jetting device that uses high-speed fluid to eject low-pressure fluid; the working fluid inlet can be an interface for introducing high-pressure motive fluid; and the ejector fluid inlet can be an interface for introducing the low-pressure fluid being ejected. For example, the working fluid of the ejector is 160°C high-temperature steam, and the ejector fluid is 120°C low-temperature steam; the ejector can complete the mixing and delivery of the two steam streams without the need for an additional power pump.

[0042] In one possible implementation, the multi-stage heat exchange module includes a preheating heat exchanger, the high-temperature side inlet of which is connected to the steam outlet of the high-temperature steam generation module, the high-temperature side outlet of which is connected to the first steam inlet of the mixing module, the low-temperature side inlet of which is used to connect to an external working fluid to be processed, and the low-temperature side outlet of which is used to output the preheated working fluid.

[0043] Specifically, the preheating heat exchanger can be a heat exchange device that realizes heat transfer between fluids; the high-temperature side can be the heat exchange side through which a high-temperature fluid is introduced; the low-temperature side can be the heat exchange side through which the working fluid to be heated is introduced; the working fluid to be treated can be a liquid or gaseous working fluid that needs to be preheated. For example, the preheating heat exchanger adopts a shell-and-tube heat exchange structure; high-temperature steam at 160°C is introduced on the high-temperature side; softened water at 25°C is introduced on the low-temperature side; after heat exchange, the temperature of the softened water rises to 100°C, and the temperature of the high-temperature steam drops to about 150°C.

[0044] In one possible implementation, the multi-stage heat exchange module further includes a flash evaporator, the inlet of which is connected to the steam outlet of the mixing module, and the steam outlet of which is used to output steam with increased dryness.

[0045] Specifically, a flash evaporator can be a flash evaporation device that vaporizes part of the liquid by reducing pressure; dryness can be the mass ratio of dry saturated steam in the steam. For example, the flash evaporator inlet is fed with mixed saturated steam at a temperature of 140°C; the internal pressure of the flash evaporator is lower than the inlet steam pressure; after flash evaporation, the steam dryness is effectively improved and the liquid water content is reduced.

[0046] In one possible implementation, a terminal superheated heat exchanger is further included. The inlet of the terminal superheated heat exchanger on the side to be heated is connected to the steam outlet of the mixing module, the inlet of the terminal superheated heat exchanger on the heat source side is connected to the bypass steam outlet of the high-temperature steam generating module, and the outlet of the terminal superheated heat exchanger on the side to be heated is used to output superheated steam.

[0047] Specifically, the terminal superheated heat exchanger can be a heat exchange device that heats saturated steam into superheated steam; the superheated steam can be steam with a temperature higher than the saturation temperature at the corresponding pressure. For example, bypass high-temperature steam from the high-temperature steam generation module is introduced to the heat source side; saturated steam at a temperature of 140°C is introduced to the side to be heated; after heat exchange, the steam temperature rises to 150°C to 160°C, becoming superheated steam.

[0048] In one possible implementation, the control module includes a temperature sensor, a controller, a first flow control valve, and a second flow control valve. The temperature sensor is located at the steam outlet of the mixing module. The signal output terminal of the temperature sensor is connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the control terminals of the first flow control valve and the second flow control valve, respectively. The first flow control valve is located on the pipeline of the first steam inlet of the mixing module, and the second flow control valve is located on the pipeline of the second steam inlet of the mixing module.

[0049] Specifically, the temperature sensor can be a sensing element that detects the steam temperature; the controller can be a control unit that performs calculations and control logic; and the flow control valve can be a valve that regulates the flow rate of fluid in the pipeline. For example, the temperature sensor is a platinum resistance temperature sensor with a measurement accuracy of 0.1℃; the controller has a built-in PID control algorithm; the first flow control valve is installed on the high-temperature steam pipeline, and the second flow control valve is installed on the low-temperature steam pipeline.

[0050] In one possible implementation, the high-temperature heat pump module adopts a reverse Carnot cycle structure, the evaporator side of the high-temperature heat pump module is used to connect to an external low-temperature heat source, and the steam outlet of the condenser side of the high-temperature heat pump module is connected to the second steam inlet of the mixing module.

[0051] Specifically, the reverse Carnot cycle can be a reversed Carnot thermodynamic cycle; the evaporator side can be the side of the heat pump that absorbs low-temperature heat; the condenser side can be the side of the heat pump that releases heat and produces steam; and the low-temperature heat source can be a low-temperature waste heat resource. For example, the high-temperature heat pump uses R1233Zd(e) as the working fluid; the low-temperature heat source uses factory wastewater at 30°C; and the condenser side produces saturated steam at 120°C.

[0052] This embodiment also provides a steam mixing method based on multi-stage heat exchange and self-powered energy supply, including the following steps:

[0053] Step 1: Generate high-temperature steam through the high-temperature steam generation module.

[0054] Step 2: High-temperature steam is introduced into the high-temperature side of the multi-stage heat exchange module to preheat the working fluid to be processed on the low-temperature side using the heat of the high-temperature steam. The cooled high-temperature steam is then transported to the mixing module.

[0055] Step 3: Generate low-temperature steam through the high-temperature heat pump module and deliver it to the mixing module.

[0056] Step 4: The two steam streams are mixed inside the mixing module to form mixed steam, which is then output to the outside.

[0057] Step 5: Monitor the temperature of the mixed steam in real time through the control module, and adjust the flow rate of the two steam streams accordingly to maintain a stable output steam temperature.

[0058] Specifically, high-temperature steam can be saturated steam with a higher temperature rating; the working medium to be treated can be a fluid medium that needs to be preheated; low-temperature steam can be saturated steam with a relatively lower temperature rating; and mixed steam can be medium-temperature steam formed by mixing two streams of steam. For example, the high-temperature steam temperature is 160°C; the low-temperature steam temperature is 120°C; the target output temperature of the mixed steam is 140°C; and the working medium to be treated is softened water, with a preheating temperature of 25°C and a preheating temperature that rises to 100°C.

[0059] In one possible implementation, the steps of preheating the working fluid by introducing high-temperature steam into a multi-stage heat exchange module, generating low-temperature steam through a high-temperature heat pump module, and mixing the two streams of steam within a mixing module include:

[0060] High-temperature steam enters the high-temperature side channel of the preheating heat exchanger, and the working fluid to be treated enters the low-temperature side channel of the preheating heat exchanger. The two fluids exchange heat through the heat exchange wall. The cooled high-temperature steam flows out from the high-temperature side outlet of the preheating heat exchanger and is transported to the mixing module.

[0061] The high-temperature heat pump module operates under reverse Carnot cycle conditions, absorbing heat from an external low-temperature heat source through the evaporator side, producing low-temperature steam on the condenser side and delivering it to the mixing module;

[0062] High-temperature steam is used as the working fluid and is introduced into the working fluid inlet of the ejector. Low-temperature steam is used as the ejector fluid and is introduced into the ejector fluid inlet. The kinetic energy of the high-temperature steam is used to eject the low-temperature steam, so that the two steam streams complete momentum and heat exchange inside the ejector.

[0063] Specifically, the heat exchange wall can be a metal wall that separates hot and cold fluids and transfers heat; the reverse Carnot cycle can be the reverse thermodynamic cycle in which the heat pump operates; momentum exchange can be the process of momentum transfer during fluid mixing; and heat exchange can be the process of heat transfer during fluid mixing. For example, the preheating heat exchanger adopts a shell-and-tube structure with seamless steel pipe walls; the external low-temperature heat source is factory wastewater at 30°C; the ejector uses 160°C high-temperature steam as a power source to eject 120°C low-temperature steam, ultimately mixing to obtain 140°C medium-temperature steam.

[0064] In one possible implementation, the steps of maintaining a stable output steam temperature and outputting the mixed steam include:

[0065] The temperature signal of the mixed steam is collected by a temperature sensor and transmitted to the controller. The controller adjusts the opening of the first flow control valve and the second flow control valve according to the deviation between the actual temperature and the set temperature, thereby changing the mass flow ratio of high-temperature steam and low-temperature steam.

[0066] After the mixed steam flows out of the mixing module, it enters the flash evaporator, where some of the liquid working fluid is vaporized under reduced pressure, thereby increasing the dryness of the output steam.

[0067] After the mixed steam flows out of the mixing module, it enters the heating side channel of the terminal superheater. The bypass steam output from the high-temperature steam generation module enters the heat source side channel of the terminal superheater, and the mixed steam is heated into superheated steam through heat exchange.

[0068] Specifically, the mass flow rate ratio can be the ratio of the mass flow rates of the two steam streams; the pressure-reducing environment can be a cavity environment where the internal pressure is lower than the saturation pressure of the inlet steam; the superheated steam can be steam with a temperature higher than the saturation temperature at the corresponding pressure. For example, the controller has a built-in PID control algorithm that automatically adjusts the valve opening based on the temperature deviation; the internal pressure of the flash evaporator is lower than the saturation pressure of the mixed steam, allowing the carried liquid moisture to vaporize rapidly; the terminal superheated heat exchanger can heat the saturated steam at 140°C to a superheated state of 150°C to 160°C.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A steam mixing system based on multi-stage heat exchange and self-powered energy supply, characterized in that, include: The system comprises a high-temperature steam generating module, a high-temperature heat pump module, a multi-stage heat exchange module, a mixing module, and a control module. The steam outlet of the high-temperature steam generating module is connected to the high-temperature inlet of the multi-stage heat exchange module. The high-temperature inlet of the multi-stage heat exchange module is connected to the first steam inlet of the mixing module. The steam outlet of the high-temperature heat pump module is connected to the second steam inlet of the mixing module. The low-temperature side of the multi-stage heat exchange module is used to connect to an external working fluid. The steam outlet of the mixing module serves as the system output. The control module is connected to the flow control valves at the two steam inlets of the mixing module to regulate the flow rate of the two steam streams.

2. The steam mixing system based on multi-stage heat exchange and self-powered energy supply according to claim 1, characterized in that, The mixing module includes an ejector, the working fluid inlet of which is connected to the first steam inlet of the mixing module, the ejector fluid inlet of which is connected to the second steam inlet of the mixing module, and the ejector outlet of which is connected to the steam outlet of the mixing module.

3. The steam mixing system based on multi-stage heat exchange and self-powered energy supply according to claim 1, characterized in that, The multi-stage heat exchange module includes a preheating heat exchanger. The high-temperature side inlet of the preheating heat exchanger is connected to the steam outlet of the high-temperature steam generation module. The high-temperature side outlet of the preheating heat exchanger is connected to the first steam inlet of the mixing module. The low-temperature side inlet of the preheating heat exchanger is used to connect to an external working fluid to be processed. The low-temperature side outlet of the preheating heat exchanger is used to output the preheated working fluid.

4. The steam mixing system based on multi-stage heat exchange and self-powered energy supply according to claim 1, characterized in that, The multi-stage heat exchange module also includes a flash evaporator, the inlet of which is connected to the steam outlet of the mixing module, and the steam outlet of which is used to output steam with increased dryness.

5. The steam mixing system based on multi-stage heat exchange and self-powered energy supply according to claim 1, characterized in that, It also includes a terminal superheated heat exchanger, wherein the inlet of the terminal superheated heat exchanger on the side to be heated is connected to the steam outlet of the mixing module, the inlet of the terminal superheated heat exchanger on the heat source side is connected to the bypass steam outlet of the high-temperature steam generating module, and the outlet of the terminal superheated heat exchanger on the side to be heated is used to output superheated steam.

6. The steam mixing system based on multi-stage heat exchange and self-powered energy supply according to claim 1, characterized in that, The control module includes a temperature sensor, a controller, a first flow control valve, and a second flow control valve. The temperature sensor is located at the steam outlet of the mixing module. The signal output terminal of the temperature sensor is connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the control terminals of the first flow control valve and the second flow control valve, respectively. The first flow control valve is located on the pipeline of the first steam inlet of the mixing module, and the second flow control valve is located on the pipeline of the second steam inlet of the mixing module.

7. The steam mixing system based on multi-stage heat exchange and self-powered energy supply according to claim 1, characterized in that, The high-temperature heat pump module adopts a reverse Carnot cycle structure. The evaporator side of the high-temperature heat pump module is used to connect to an external low-temperature heat source, and the steam outlet of the condenser side of the high-temperature heat pump module is connected to the second steam inlet of the mixing module.

8. A steam mixing method based on multi-stage heat exchange and self-powered energy supply, characterized in that, Includes the following steps: High-temperature steam is generated through a high-temperature steam generation module; High-temperature steam is introduced into the high-temperature side of the multi-stage heat exchange module to preheat the working fluid to be processed on the low-temperature side using the heat of the high-temperature steam. The cooled high-temperature steam is then transported to the mixing module. Low-temperature steam is generated by a high-temperature heat pump module and delivered to the mixing module; The two streams of steam are mixed inside the mixing module to form mixed steam, which is then output externally. The control module monitors the temperature of the mixed steam in real time and adjusts the flow rate of the two steam streams accordingly to maintain a stable output steam temperature.

9. The steam mixing method based on multi-stage heat exchange and self-powered energy supply according to claim 8, characterized in that, The steps of preheating the working fluid by introducing high-temperature steam into a multi-stage heat exchange module, generating low-temperature steam through a high-temperature heat pump module, and mixing the two streams of steam inside a mixing module include: High-temperature steam enters the high-temperature side channel of the preheating heat exchanger, and the working fluid to be treated enters the low-temperature side channel of the preheating heat exchanger. The two fluids exchange heat through the heat exchange wall. The cooled high-temperature steam flows out from the high-temperature side outlet of the preheating heat exchanger and is transported to the mixing module. The high-temperature heat pump module operates under reverse Carnot cycle conditions, absorbing heat from an external low-temperature heat source through the evaporator side, producing low-temperature steam on the condenser side and delivering it to the mixing module; High-temperature steam is used as the working fluid and is introduced into the working fluid inlet of the ejector. Low-temperature steam is used as the ejector fluid and is introduced into the ejector fluid inlet. The kinetic energy of the high-temperature steam is used to eject the low-temperature steam, so that the two steam streams complete momentum and heat exchange inside the ejector.

10. The steam mixing method based on multi-stage heat exchange and self-powered energy supply according to claim 1, characterized in that, The steps of maintaining a stable output steam temperature and outputting mixed steam include: The temperature signal of the mixed steam is collected by a temperature sensor and transmitted to the controller. The controller adjusts the opening of the first flow control valve and the second flow control valve according to the deviation between the actual temperature and the set temperature, thereby changing the mass flow ratio of high-temperature steam and low-temperature steam. After the mixed steam flows out of the mixing module, it enters the flash evaporator, where some of the liquid working fluid is vaporized under reduced pressure, thereby increasing the dryness of the output steam. After the mixed steam flows out of the mixing module, it enters the heating side channel of the terminal superheater. The bypass steam output from the high-temperature steam generation module enters the heat source side channel of the terminal superheater, and the mixed steam is heated into superheated steam through heat exchange.

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