Water heating device applied to automatic switching of different heat sources of thermal power plant

Abstract

The invention relates to the technical field of thermal power plants, in particular to a water heating device applied to automatic switching of different heat sources in a thermal power plant, which comprises a steam heating system comprising a steam inlet, an electric valve, a double-layer stainless steel heat preservation water tank and a steam pressure reduction nozzle; the electric heating system comprises an electric heating steam generator, a stainless steel water feeding pump and an electric heating electric door; the heat preservation water storage tank is provided with an automatic floating ball valve for controlling the water level; the circulating water pump is used for providing hot water for users; the pressure measuring point is mounted on the steam pipeline, is used for detecting whether a steam supply control system exists or not, is connected with the pressure measuring point, the electric valve and the electric heating electric door, and is used for realizing automatic switching between steam heating and electric heating, so that automatic electric heating switching of the thermal power plant when no auxiliary steam exists is realized; and the reliability and the automation level of the system are improved. And waste of heat energy and water resources is reduced through an optimized heating mode, and more environment-friendly and energy-saving effects are achieved. The manual operation requirement is reduced, and the operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power plants, and particularly to a water heating device for automatic switching of different heat sources in thermal power plants. Background Art

[0002] With the development of new energy power generation, the power generation of traditional thermal power plants has decreased, resulting in extended downtime, which in turn affects the hot water supply to users. In the prior art, although there is an electric heating auxiliary system, there is a lack of an effective automatic switching mechanism and manual intervention is required, increasing the operation cost and possibly causing service interruptions. In addition, the traditional steam heating method causes a large amount of heat and water resource waste. Summary of the Invention

[0003] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] In view of the problem that the above-mentioned thermal power plant cannot automatically switch to the electric heating system without auxiliary steam to ensure that users can continuously obtain hot water, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a water heating device for automatic switching of different heat sources in thermal power plants.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A water heating device for automatic switching of different heat sources in thermal power plants, comprising: A steam heating system, including an external steam inlet and an electric valve provided on the pipeline of the external steam inlet, wherein the electric valve is used to control the steam to enter the heat preservation water tank. The heat preservation water tank is made of double-layer stainless steel for heat preservation. A steam pressure reducing nozzle is provided at the bottom end of the heat preservation water tank, and the steam pressure reducing nozzle is used for mixing steam and cold water;

[0007] An electric heating system, including an electric heating steam generator connected to the side wall of the heat preservation water tank through a steam pipeline. A stainless steel water supply pump is installed on the side wall of the electric heating steam generator, and the stainless steel water supply pump is used to transport the water in the heat preservation water tank to the electric heating steam generator. An electric heating electric door is installed at the end of the steam pipeline;

[0008] An automatic float ball valve is provided inside the heat preservation water tank to control the water level. A circulating water pump is installed on the side wall of the heat preservation water tank. The circulating water pump is a variable frequency pump, and two of the circulating water pumps are used alternately and one is in standby, for providing hot water to users. A pressure measuring point is installed on the side wall of the steam pipeline and extends into the interior of the heat preservation water tank for detecting whether there is steam supply;

[0009] A control system, connected to the pressure measuring point, the electric valve and the electro-heated electric door, for automatically switching between steam heating and electric heating.

[0010] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, wherein: the control system includes: a pressure controller for obtaining the pressure signal of the pressure measuring point;

[0011] A logic control module for judging whether the pressure signal is zero, so as to decide to start the steam heating system or the electric heating system.

[0012] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, wherein: the electro-heated steam generator has functions of automatic pressure regulation control and water level control.

[0013] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, wherein: the heat preservation water storage tank is equipped with a temperature controller for controlling the opening and closing of the electric valve to maintain the water temperature in the tank stable.

[0014] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, wherein: the steam pressure reducing nozzle is located below the lowest liquid level of the heat preservation water tank to ensure effective mixing of steam and cold water to generate hot water.

[0015] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, wherein: the circulating water pump is a variable frequency circulating water pump, which can adjust the water supply flow according to user needs.

[0016] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, wherein: the electric heating element of the electro-heated steam generator is of high-efficiency energy-saving type and can quickly heat up in a short time.

[0017] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, wherein: the control system further includes a fault detection module for real-time monitoring of the working states of all parts of the system and sending an alarm when an abnormality occurs.

[0018] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, wherein: the heat preservation material of the heat preservation water storage tank is a high-performance heat insulation material.

[0019] As a preferred embodiment of the water heating device for automatically switching different heat sources in a thermal power plant according to the present invention, which includes the following steps:

[0020] When the steam pressure is detected by the pressure measuring point, the control system turns on the steam heating system;

[0021] When the steam pressure is not detected by the pressure measuring point, the control system turns off the steam heating system and simultaneously turns on the electric heating system;

[0022] In any case, hot water is supplied to users through the circulating water pump.

[0023] Advantages of the present invention: The present invention realizes the automatic electric heating switching of thermal power plants without auxiliary steam, improves the reliability and automation level of the system. By optimizing the heating method, the waste of thermal energy and water resources is reduced, making it more environmentally friendly and energy-saving. The need for manual operation is reduced, and the operating cost is lowered. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

[0025] Figure 1 It is an overall schematic diagram of a water heating device for automatic switching of different heat sources in a thermal power plant.

[0026] Figure 2 It is a schematic diagram of the frame structure of a water heating device for automatic switching of different heat sources in a thermal power plant.

[0027] Figure 3 It is a schematic diagram of the process structure of a water heating device for automatic switching of different heat sources in a thermal power plant. Detailed Embodiments

[0028] To make the above objects, features, and advantages of the present invention more obvious and understandable, the detailed embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0029] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0030] Second, the "one embodiment" or "embodiment" mentioned herein refers to specific features, structures or characteristics that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it a separate or selectively mutually exclusive embodiment with other embodiments.

[0031] Thirdly, the present invention is described in detail in conjunction with schematic diagrams. When detailing the embodiments of the present invention, for the convenience of explanation, the cross-sectional views showing the device structure will be locally enlarged out of the general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention here. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0032] Embodiment 1, referring to Figure 1 , is the first embodiment of the present invention. This embodiment provides a water heating device for automatic switching of different heat sources in a thermal power plant, including a steam heating system, including an external steam inlet, an electric valve provided on the pipeline of the external steam inlet, wherein the electric valve is used to control the steam to enter the heat preservation water tank, the heat preservation water tank is made of double-layer stainless steel heat preservation material, and a steam pressure reducing nozzle is provided at the bottom end of the heat preservation water tank, wherein the steam pressure reducing nozzle is used for steam and cold water mixing;

[0033] An electric heating system, including an electric heating steam generator connected to the side wall of the heat preservation water tank through a steam pipeline, a stainless steel water supply pump installed on the side wall of the electric heating steam generator, wherein the stainless steel water supply pump is used to transport the water in the heat preservation water tank to the electric heating steam generator, and an electric heating electric door is installed at the end of the steam pipeline;

[0034] An automatic float ball valve is provided inside the heat preservation water tank to control the water level. A circulating water pump is installed on the side wall of the heat preservation water tank. The circulating water pump is a variable frequency pump, and the two circulating water pumps are one in use and one in standby, and are used to provide hot water to users; A pressure measuring point is installed on the side wall of the steam pipeline and extends into the interior of the heat preservation water tank to detect whether there is steam supply;

[0035] A control system, connected to the pressure measuring point, the electric valve and the electric heating electric door, is used for automatic switching between steam heating and electric heating.

[0036] Operation process: Ensure that the heat preservation storage water tank is filled with tap water, and the automatic float ball valve controls the water level in the water tank to keep it at the set value. Check whether all valves and pipeline connections are intact to ensure that the system has no leakage.

[0037] Start the steam heating system: When the thermal power plant supplies steam, the pressure measuring point detects the steam pressure (the reading is not zero). The control system receives the pressure signal and opens the electric valve of the steam heating system. Steam enters the double-layer stainless steel heat preservation water tank through the electric valve, mixes with cold water below the lowest liquid level of the water tank through the steam pressure reducing nozzle, and generates hot water. The temperature controller in the heat preservation water tank monitors the water temperature and keeps the water temperature within the set range by controlling the opening and closing of the electric valve. The variable frequency circulating water pump pumps the hot water out of the water tank and transports it to the user through the pipeline.

[0038] Switch to the electric heating system: When the thermal power plant stops supplying steam, the pressure measuring point detects that the steam pressure is 0. The control system receives the pressure signal of 0, closes the electric valve of the steam heating system. The control system opens the electric heating electric door of the electric heating system and starts the electric heating steam generator. The stainless steel feed water pump extracts cold water from the heat preservation storage water tank and sends it into the electric heating steam generator, which is quickly heated into high-temperature and high-pressure steam through the electric heating element. The high-temperature and high-pressure steam continuously outputs to the heat preservation water tank through the electric valve and mixes with cold water to generate hot water. The temperature controller in the heat preservation water tank continues to monitor the water temperature and keeps the water temperature within the set range by controlling the opening and closing of the electric valve. The variable frequency circulating water pump continues to pump the hot water out of the water tank and transports it to the user through the pipeline.

[0039] System monitoring and maintenance: The fault detection module in the control system monitors the working status of each part of the system in real time. If any abnormality is found (such as too high temperature, abnormal pressure, etc.), an alarm will be issued immediately and corresponding measures will be taken. Regularly check and maintain each component to ensure the long-term stable operation of the system.

[0040] Safe operation: During the operation process, it is necessary to comply with the safety regulations, regularly check the equipment to prevent accidents. Regularly maintain and service the system, especially check and calibrate key components such as electric valves, pressure measuring points, and temperature controllers to ensure their normal operation. In extreme weather conditions, pay attention to heat preservation measures to prevent pipelines and equipment from being damaged due to low temperature.

[0041] Example 2, refer to Figure 1 , which is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the control system is optimized to add more intelligent functions to improve the automation and reliability of the system.

[0042] Specifically, the control system includes: a pressure controller for obtaining the pressure signal of the pressure measuring point;

[0043] A logic control module for judging whether the pressure signal is zero, so as to decide to start the steam heating system or the electric heating system.

[0044] Furthermore, the electric heating steam generator has functions of automatic pressure control and water level control.

[0045] Further, the heat preservation and water storage tank is equipped with a temperature controller for controlling the opening and closing of the electric valve to maintain the stability of the water temperature in the tank.

[0046] Further, the steam pressure reducing nozzle is located below the lowest liquid level of the heat preservation water tank to ensure the effective mixing of steam and cold water to generate hot water.

[0047] Further, the circulating water pump is a variable frequency circulating water pump, which can adjust the water supply flow according to user needs.

[0048] The rest of the structure is the same as that of Embodiment 1.

[0049] Operation process: Ensure that the heat preservation and water storage tank is filled with tap water, and the automatic float valve controls the water level in the tank to keep it at the set value. Check whether all valves and pipeline connections are in good condition to ensure that the system has no leakage. Start the control system to ensure that all sensors and control modules work normally.

[0050] Start the steam heating system: When the thermal power plant supplies steam, the pressure measuring point detects the steam pressure (the reading is not 0). The pressure controller transmits the pressure signal to the logic control module. The logic control module determines that the pressure signal is not 0 and sends an instruction to open the electric valve of the steam heating system. Steam enters the double-layer stainless steel heat preservation water tank through the electric valve, and is mixed with cold water below the lowest liquid level of the water tank through the steam pressure reducing nozzle to generate hot water. The temperature controller in the heat preservation water tank monitors the water temperature and keeps the water temperature within the set range by controlling the opening and closing of the electric valve. The variable frequency circulating water pump pumps the hot water out of the water tank and transports it to the user through the pipeline.

[0051] Switch to the electric heating system: When the thermal power plant stops supplying steam, the pressure measuring point detects that the steam pressure is 0. The pressure controller transmits the pressure signal to the logic control module. The logic control module determines that the pressure signal is 0 and sends an instruction to close the electric valve of the steam heating system. The logic control module simultaneously sends an instruction to open the electric heating electric door of the electric heating system and start the electric heating steam generator. The stainless steel feed water pump extracts cold water from the heat preservation and water storage tank and sends it into the electric heating steam generator, where it is quickly heated into high-temperature and high-pressure steam by the electric heating element. The automatic regulating pressure control and water level control functions of the electric heating steam generator ensure the stable output of steam. The high-temperature and high-pressure steam is continuously output to the heat preservation water tank through the electric valve and mixed with cold water to generate hot water. The temperature controller in the heat preservation water tank continues to monitor the water temperature and keeps the water temperature within the set range by controlling the opening and closing of the electric valve. The variable frequency circulating water pump continues to pump the hot water out of the water tank and transports it to the user through the pipeline.

[0052] System Monitoring and Maintenance: The fault detection module in the control system monitors the working status of each part of the system in real time. If any abnormality (such as too high temperature, abnormal pressure, etc.) is detected, an alarm will be immediately issued and corresponding measures will be taken. The logic control module records the system operation data and generates operation reports for subsequent analysis and maintenance. Regularly check and maintain each component to ensure the long-term stable operation of the system.

[0053] In a large thermal power plant, due to the instability of steam supply and the diversity of users' hot water demands, a water heating device that can automatically switch between different heat sources and ensure high efficiency, energy conservation, and stable water supply is needed. The following embodiment not only realizes the automatic switching function, but also greatly improves the energy efficiency ratio of the system, and enhances the reliability and maintenance convenience of the device through an intelligent control system.

[0054] Embodiment 3, referring to Figure 1 , is the third embodiment of the present invention. The difference between this embodiment and the above embodiments is that the electric heating element of the electric heating steam generator is of high-efficiency energy-saving type and can rapidly heat up in a short time.

[0055] Furthermore, the control system further includes a fault detection module for monitoring the working status of each part of the system in real time and issuing an alarm when an abnormality occurs. It integrates a high-performance pressure controller, a logic control module, and a fault detection module, which can monitor the system status in real time and immediately alarm and take measures when an abnormality occurs.

[0056] Furthermore, the heat preservation material of the heat preservation water storage tank is a high-performance heat insulation material to reduce heat loss and improve energy utilization efficiency.

[0057] Furthermore, it includes the following steps:

[0058] When the pressure measuring point detects the steam pressure, the control system turns on the steam heating system;

[0059] When the pressure measuring point does not detect the steam pressure, the control system turns off the steam heating system and simultaneously turns on the electric heating system. Adopting the latest high-efficiency energy-saving technology, the electric heating steam generator can rapidly heat up in a short time, greatly reducing power consumption;

[0060] In any case, hot water is supplied to users through a circulation water pump, and the water supply flow rate is dynamically adjusted according to the actual demands of users to ensure the flexibility and high efficiency of hot water supply.

[0061] The remaining structures are the same as those in Embodiment 2.

[0062] Operation process: The steam enters the double-layer stainless steel heat preservation water tank through the electric valve. The steam pressure reducing nozzle is located below the lowest liquid level of the water tank to ensure the effective mixing of steam and cold water, generating hot water. High-efficiency and energy-saving electric heating elements and high-performance heat insulation materials are adopted, which can save more than 30% of the energy consumption compared with traditional devices.

[0063] Electric heating system: When the steam pressure cannot be detected by the pressure measuring point, the control system will automatically shut down the steam heating system and start the electric heating system. The stainless steel feed water pump in the electric heating system extracts cold water from the heat preservation storage water tank, sends it into the electric heating steam generator to be heated into high-temperature and high-pressure steam, and then transports it to the user through the electric valve.

[0064] Control system: Integrated with a pressure controller and a logic control module, it can automatically switch the heating mode according to the reading of the pressure measuring point (i.e., steam pressure) without manual intervention. The intelligent control system realizes the seamless automatic switch from steam heating to electric heating without manual intervention, greatly improving the operation convenience and response speed.

[0065] Other components: The automatic float ball valve equipped on the heat preservation storage water tank ensures a constant water level, and the circulating water pump is responsible for transporting hot water to the user. In addition, the water tank is also equipped with a temperature controller to ensure that the water temperature is maintained within the preset range. The adaptive circulating water pump flexibly adjusts the water supply according to user needs, ensuring the continuity and comfort of hot water supply. The integrated fault detection and alarm system, combined with regular maintenance suggestions, effectively prevents accidents from occurring and extends the service life of the equipment.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A water heating device for automatic switching of different heat sources in a thermal power plant, characterized in that: include, The steam heating system comprises an external steam inlet and an electric valve arranged on the external steam inlet pipe, wherein the electric valve is used to control the steam to enter the insulated water tank, the insulated water tank is made of double-layer stainless steel insulation material, and a steam pressure reducing nozzle is arranged at the bottom of the insulated water tank, wherein the steam pressure reducing nozzle is used to mix steam with cold water; The electric heating system comprises an electric heating steam generator connected to the side wall of the insulated water tank through a steam pipe, a stainless steel water feed pump is installed on the side wall of the electric heating steam generator, wherein the stainless steel water feed pump is used to transport water in the insulated water tank to the electric heating steam generator, and an electric heating electric door is installed at the end of the steam pipe; An automatic float valve is provided inside the insulated water tank to control the water level, and a circulating water pump is installed on the side wall of the insulated water tank, wherein the circulating water pump is a variable frequency pump, and two circulating water pumps are provided, one for use and one for standby, for providing hot water to users; a pressure measuring point is installed on the side wall of the steam pipe and extends into the interior of the insulated water tank for detecting whether there is steam supply; A control system is connected to the pressure measuring point, the electric valve and the electric heating electric door, and is used for automatic switching between steam heating and electric heating.

2. The water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 1, characterized in that: The control system includes: a pressure controller for obtaining a pressure signal of a pressure measuring point; The logic control module is used to determine whether the pressure signal is zero, thereby deciding whether to start the steam heating system or the electric heating system.

3. The water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 2, characterized in that: The electric heating steam generator has the functions of automatically adjusting pressure control and water level control.

4. The water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 3, characterized in that: The thermal insulation water storage tank is equipped with a temperature controller for controlling the opening and closing of the electric valve to maintain a stable water temperature in the water tank.

5. The water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 4, characterized in that: The steam pressure reducing nozzle is located below the lowest liquid level of the thermal insulation water tank to ensure that the steam and cold water are effectively mixed to produce hot water.

6. The water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 5, characterized in that: The circulating water pump is a variable frequency circulating water pump, and the water supply flow rate can be adjusted according to user needs.

7. The water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 6, characterized in that: The electric heating element of the electric heating steam generator is highly efficient and energy-saving and can heat up quickly in a short time.

8. The water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 7, characterized in that: The control system also includes a fault detection module for real-time monitoring of the working status of each part of the system and issuing an alarm when an abnormality occurs.

9. The water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 8, characterized in that: The heat-insulating material of the heat-insulating water storage tank is a high-performance heat-insulating material.

10. The application method of the water heating device for automatic switching of different heat sources in a thermal power plant as claimed in claim 9, characterized in that: The following steps are involved: When the pressure measuring point detects the steam pressure, the control system turns on the steam heating system; When the pressure measuring point fails to detect the steam pressure, the control system shuts down the steam heating system and turns on the electric heating system; In any case, hot water is supplied to the users via a circulating water pump.

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