A heating method and system for a water supply tank in a power plant

Abstract

The present application discloses a heating method for a water supply tank in a power plant. The method accurately determines the steam flow rate and the power of the electric heating rod according to the water temperature value, air temperature value and water level value in the water tank, thereby avoiding excessive consumption of energy. In addition, since the water storage capacity of the water tank in the power plant is large and the internal temperature is not uniform, in order to reduce the loss of heat energy, the water in the water tank is extracted at the most appropriate height according to the water temperature values ​​at different heights in the water tank, further reducing the energy consumed to heat the water. The present application discloses a heating system for a water supply tank in a power plant. The water in the water tank is heated by the steam heat exchange tube and the electric heating rod, and the valve opening of the steam heat exchange tube and the power of the electric heating rod are accurately controlled by the analysis and processing module, thereby avoiding excessive consumption of energy.

Description

Technical Field

[0001] The invention relates to the technical field of power plant equipment, and in particular to a heating method and system for a water supply tank of a power plant. Background Art

[0002] There will inevitably be steam and water losses in the production process of power plants, so there must be a make-up water introduction system. Under normal circumstances, the steam and water losses of power plants include leakage in loose equipment and pipelines and some necessary and unavoidable steam and water losses, such as boiler blowdown, deaerator exhaust, steam extracted by water-wading vacuum pumps, steam and water sampling, boiler steam soot blowing, etc.

[0003] In the prior art, in order to replenish water for power plants, water is mostly introduced directly into the cooling tower of the power plant, and the cooling water is recycled. In the winter in northern regions, due to the low temperature, the replenished water needs to be electrically heated to avoid damage to the power generation equipment caused by too low temperature. However, since the power plant needs to replenish a large amount of water, using only electric heating will consume too much electricity. Summary of the invention

[0004] The object of the present invention is to provide a method and system for heating supplementary water for a power plant, which can utilize a variety of heating methods to heat the supplementary water, thereby reducing the power consumption of electric heating.

[0005] Therefore, the present invention discloses a method for heating a water tank for a power plant, which comprises a water tank, an electric heating rod and a steam heat exchange pipe, wherein the electric heating rod is arranged in the water tank, the steam heat exchange pipe is arranged in the water tank and is connected to a steam source;

[0006] Acquire the water temperature value of the water in the water tank in real time, and adjust the steam flow rate in the steam heat exchange tube according to the water temperature value;

[0007] If the steam flow rate of the steam heat exchange tube reaches the maximum and the water temperature is lower than the temperature required by the power plant, the electric heating rod is powered on to heat the water in the water tank;

[0008] The water temperature values ​​of the water at different heights in the water tank are obtained, and the water pumping height is determined according to the water temperature values ​​so as to timely pump out the heated water.

[0009] In some embodiments of the present application, in order to waste the heat of the steam source, a method for adjusting the steam flow rate in the steam heat exchange tube is disclosed. The method for adjusting the steam flow rate in the steam heat exchange tube includes:

[0010] A preset steam flow comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and steam flow amount;

[0011] The air temperature value, water temperature value and water level value are obtained in real time, and the steam flow rate is determined according to the steam flow comparison table.

[0012] In some embodiments of the present application, in order to avoid wasting electric energy, a method for determining the energizing power of the electric heating rod is disclosed. The method for determining the energizing power of the electric heating rod includes:

[0013] A preset power-on power comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and power-on power;

[0014] The air temperature value, water temperature value and water level value are obtained in real time, and the power supply power of the electric heating rod is determined according to the power supply power comparison table.

[0015] The present application discloses a method for heating a water make-up tank in a power plant. The method accurately determines the steam flow rate and the energizing power of an electric heating rod according to the water temperature value, air temperature value and water level value in the water tank, thereby avoiding excessive consumption of energy. Furthermore, since the water storage capacity of the power plant water tank is large and the internal temperature is not uniform, in order to reduce the loss of heat energy, the water in the water tank is extracted at the most appropriate height according to the water temperature values ​​at different heights in the water tank, thereby further reducing the energy consumed for heating the water.

[0016] A heating system for a water supply tank in a power plant, characterized by comprising:

[0017] Water tank;

[0018] A plurality of electric heating rods are arranged inside the water tank and are used to electrically heat the water in the water tank;

[0019] A steam heat exchange pipe is arranged in the water tank and connected to a steam source, and is used to heat the water in the water tank;

[0020] A plurality of water temperature sensors are evenly arranged vertically inside the water tank and are used to obtain the water temperature value of the water in the water tank;

[0021] an analysis and processing module connected to the water temperature sensor, for receiving the water temperature value monitored by the water temperature sensor, and controlling the valve opening on the steam heat exchange tube according to the water temperature value; if the steam flow of the steam heat exchange tube reaches the maximum and the water temperature value is lower than the temperature value required for water use in the power plant, the electric heating rod is driven to generate heat to heat the water in the water tank;

[0022] A plurality of water outlet pipes are vertically arranged in the water tank and used for extracting water from the water tank;

[0023] The analysis and processing module determines the water outlet pipe for water outlet according to the water temperature values ​​measured by the water temperature sensors at different heights, so that the outlet water temperature meets the water demand of the power plant.

[0024] In some embodiments of the present application, in order to be able to export water at a specified height in the water tank, the heating system is improved, and the heating system further includes a plurality of water outlet pipes arranged vertically;

[0025] The water temperature sensor is arranged at the pipe mouth of the water outlet pipe.

[0026] In some embodiments of the present application, in order to enable the steam heat exchange tube to heat the water in the water tank more efficiently, the steam heat exchange tube is improved, and the steam heat exchange tube includes a water inlet section, a water outlet section and a spiral section, and the water inlet section and the water outlet section are arranged at both ends of the spiral section and extend out of the water tank;

[0027] The spiral section is arranged in the middle of the water tank and presents a vertical spiral structure, thereby increasing the contact area with water and improving the heating effect on water.

[0028] In some embodiments of the present application, in order to enable the water outlet pipe to promptly discharge the heated water and avoid heat loss due to heat conduction, the position of the water outlet pipe's mouth is limited, and the water outlet pipe's mouth is close to the spiral section of the steam heat exchange pipe.

[0029] In some embodiments of the present application, in order to accurately introduce steam into the steam heat exchange tube and avoid heat loss of the steam source, a method for adjusting the steam flow rate of the steam heat exchange tube is disclosed, which is specifically achieved by adjusting the opening of the valve on the steam heat exchange tube. The method for adjusting the opening of the valve on the steam heat exchange tube includes:

[0030] A preset steam flow comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and valve opening;

[0031] The analysis and processing module obtains air temperature values, water temperature values ​​and water level values ​​in real time, and determines the valve opening according to the steam flow comparison table.

[0032] In some embodiments of the present application, in order to accurately control the electric heating rod to heat the water in the water tank, a method for determining the power of the electric heating rod is disclosed. The method for determining the power of the electric heating rod includes:

[0033] A preset power-on power comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and power-on power;

[0034] The analysis and processing module obtains air temperature value, water temperature value and water level value in real time, and determines the power supply of the electric heating rod according to the power supply comparison table.

[0035] In some embodiments of the present application, in order to convert solar energy into thermal energy of water in the water tank, the system further includes a heat collection mechanism disposed on the top of the water tank, and the heat collection mechanism includes:

[0036] A vacuum isolation cover is arranged on the top of the water tank;

[0037] The heat collecting plate is arranged in the vacuum insulation cover, and a heat conducting plate is arranged at the bottom. The heat conducting plate penetrates the vacuum insulation cover and extends into the water tank.

[0038] The present application discloses a heating system for a water supply tank in a power plant, which heats the water in the water tank by means of the steam heat exchange tube and the electric heating rod, and accurately controls the valve opening of the steam heat exchange tube and the energizing power of the electric heating rod through an analysis and processing module, thereby avoiding excessive consumption of energy.

[0039] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of the steps of a heating system for a water supply tank in a power plant according to an embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the structure of a power plant water supply tank with a heating system in an embodiment of the present application.

[0042] Reference numerals

[0043] 1. Water tank; 2. Electric heating rod; 3. Water inlet section; 4. Water outlet section; 5. Spiral section; 6. Vacuum isolation cover; 7. Heat collecting plate; 8. Heat conducting plate; 9. Water outlet pipe; 10. Water temperature sensor. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0045] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] Example:

[0047] In the prior art, in order to replenish water for power plants, water is mostly introduced directly into the cooling tower of the power plant, and the cooling water is recycled. In the winter in northern regions, due to the low temperature, the replenished water needs to be electrically heated to avoid damage to the power generation equipment caused by too low temperature. However, since the power plant needs to replenish a large amount of water, using only electric heating will consume too much electricity.

[0048] To solve the above problems, Figure 2 The present application discloses a method for heating a water supply tank of a power plant, which comprises a water tank 1, an electric heating rod 2 and a steam heat exchange tube. The electric heating rod 2 is arranged in the water tank 1, and the steam heat exchange tube is arranged in the water tank 1 and connected to a steam source.

[0049] Through the above structure, the method of achieving the temperature increase of the water in the water tank while saving energy consumption includes:

[0050] Step 1: obtaining the water temperature value of the water in the water tank in real time, and adjusting the steam flow rate in the steam heat exchange tube according to the water temperature value.

[0051] Step 2: If the steam flow rate of the steam heat exchange tube reaches the maximum and the water temperature is lower than the temperature required by the power plant, the electric heating rod is energized to heat the water in the water tank.

[0052] In step 2, firstly, a steam source is introduced through the steam heat exchange tube to increase the temperature of the water. If the temperature of the introduced steam source cannot make the water in the water tank reach the specified temperature, the electric heating rod is started again for electric heating. In this way, the consumption of electric energy is reduced.

[0053] Step 3, obtaining water temperature values ​​of water at different heights in the water tank, determining the water pumping height according to the water temperature values, and timely pumping out the heated water.

[0054] Since the water tank used in the power plant contains a large amount of water, the temperature distribution is uneven, and since the water occupies a large volume, the heat loss will be greater, and the water temperature at different heights is different. In order to avoid energy consumption, in step 3, the water outlet height is determined according to the water temperature value, so that water that meets the water requirements of the power plant can be exported.

[0055] In some embodiments of the present application, in order to waste the heat of the steam source, a method for adjusting the steam flow rate in the steam heat exchange tube is disclosed. The method for adjusting the steam flow rate in the steam heat exchange tube includes:

[0056] Step 4: preset a steam flow comparison table, wherein the steam flow comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and steam flow amount.

[0057] As those skilled in the art can understand, the energy consumed to raise the temperature of the water in the water tank is related to the temperature at site. If the temperature at site is lower, the energy consumed is higher. The energy consumed to raise the temperature of the water in the water tank is related to the original temperature of the water in the water tank. If the temperature of the water in the water tank is lower, the energy consumed is higher. The energy consumed to raise the temperature of the water in the water tank is related to the volume of the water in the water tank. If the volume of water is larger, the energy consumed is higher.

[0058] Step 5, obtaining air temperature value, water temperature value and water level value in real time, and determining steam flow rate according to the steam flow comparison table.

[0059] In some embodiments of the present application, in order to avoid wasting electric energy, a method for determining the energizing power of the electric heating rod is disclosed. The method for determining the energizing power of the electric heating rod includes:

[0060] Step 6: preset a power-on comparison table, wherein the power-on comparison table is used to indicate the corresponding relationship among air temperature value, water temperature value, water level value and power-on power.

[0061] For understanding of step 6, refer to step 4.

[0062] Step 7, obtaining the air temperature value, water temperature value and water level value in real time, and determining the power supply power of the electric heating rod according to the power supply power comparison table.

[0063] The present application discloses a method for heating a water make-up tank in a power plant. The method accurately determines the steam flow rate and the energizing power of an electric heating rod according to the water temperature value, air temperature value and water level value in the water tank, thereby avoiding excessive consumption of energy. Furthermore, since the water storage capacity of the power plant water tank is large and the internal temperature is not uniform, in order to reduce the loss of heat energy, the water in the water tank is extracted at the most appropriate height according to the water temperature values ​​at different heights in the water tank, thereby further reducing the energy consumed for heating the water.

[0064] In order to further illustrate the technical solution of this application, Figure 1 The technical solution of the present application is now explained by disclosing a method and steps for constructing a heating system for a power plant feed water tank.

[0065] S1, preset steam flow comparison table and power comparison table.

[0066] S2, if the steam flow rate of the steam heat exchange tube reaches the maximum and the water temperature value is lower than the temperature value required for water use in the power plant, the electric heating rod is energized to heat the water in the water tank 1.

[0067] S3, obtaining air temperature value, water temperature value and water level value in real time, and determining the steam flow rate according to the steam flow comparison table.

[0068] S4, obtaining air temperature value, water temperature value and water level value in real time, and determining the power supply power of the electric heating rod according to the power supply power comparison table.

[0069] S5, obtaining water temperature values ​​of water at different heights in the water tank, determining the water pumping height according to the water temperature values, and timely pumping out the heated water.

[0070] Among them, in step S1, the steam flow comparison table is used to represent the correspondence between air temperature value, water temperature value, water level value and steam flow rate, and the power-on comparison table is used to represent the correspondence between air temperature value, water temperature value, water level value and power-on power.

[0071] The present application also discloses a heating system for a water supply tank of a power plant, such as Figure 1 The heating system includes a water tank 1, a plurality of electric heating rods 2, a steam heat exchange tube, a plurality of water temperature sensors 10 and an analysis and processing module.

[0072] The electric heating rod 2 is disposed inside the water tank 1 and is used to electrically heat the water in the water tank 1 .

[0073] The steam heat exchange pipe is disposed in the water tank 1 and is connected to a steam source for heating the water in the water tank 1 .

[0074] The water temperature sensor 10 is evenly arranged vertically inside the water tank 1 to obtain the water temperature value of the water in the water tank 1 .

[0075] The analysis and processing module is connected to the water temperature sensor 10, and is used to receive the water temperature value monitored by the water temperature sensor 10, and control the valve opening on the steam heat exchange tube according to the water temperature value; if the steam flow rate of the steam heat exchange tube reaches the maximum and the water temperature value is lower than the temperature value required for water use in the power plant, the electric heating rod 2 is driven to generate heat to heat the water in the water tank 1.

[0076] A plurality of water outlet pipes 9 are vertically arranged in the water tank 1 for extracting water from the water tank 1 .

[0077] The analysis and processing module determines the water outlet pipe 9 for water outlet according to the water temperature values ​​measured by the water temperature sensors 10 at different heights, so that the outlet water temperature meets the water demand of the power plant.

[0078] In some embodiments of the present application, in order to be able to drain water at a specified height in the water tank 1, the heating system is improved, and the heating system further includes a plurality of water outlet pipes 9 arranged vertically;

[0079] The water temperature sensor 10 is arranged at the pipe opening of the water outlet pipe 9 .

[0080] In some embodiments of the present application, in order to enable the steam heat exchange tube to heat the water in the water tank 1 more efficiently, the steam heat exchange tube is improved, and the steam heat exchange tube includes a water inlet section 3, a water outlet section 4 and a spiral section 5, and the water inlet section 3 and the water outlet section 4 are arranged at both ends of the spiral section 5 and extend out of the water tank 1.

[0081] The spiral section 5 is arranged in the middle of the water tank 1 and has a vertical spiral structure, thereby increasing the contact area with water and improving the heating effect on water.

[0082] In some embodiments of the present application, in order to enable the water outlet pipe 9 to promptly discharge the heated water and avoid heat loss due to heat conduction, the position of the pipe mouth of the water outlet pipe 9 is limited, and the pipe mouth of the water outlet pipe 9 is close to the spiral section 5 of the steam heat exchange tube.

[0083] In some embodiments of the present application, in order to accurately introduce steam into the steam heat exchange tube and avoid heat loss of the steam source, a method for adjusting the steam flow rate of the steam heat exchange tube is disclosed, which is specifically achieved by adjusting the opening of the valve on the steam heat exchange tube. The method for adjusting the opening of the valve on the steam heat exchange tube includes:

[0084] A steam flow comparison table is preset, and the steam flow comparison table is used to indicate the correspondence between air temperature value, water temperature value, water level value and valve opening; the analysis and processing module obtains air temperature value, water temperature value and water level value in real time, and determines the valve opening according to the steam flow comparison table.

[0085] In some embodiments of the present application, in order to accurately control the electric heating rod 2 to heat the water in the water tank 1, a method for determining the power of the electric heating rod 2 is disclosed. The method for determining the power of the electric heating rod 2 includes:

[0086] A power-on comparison table is preset, and the power-on comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and power-on power; the analysis and processing module obtains air temperature value, water temperature value and water level value in real time, and determines the power-on power of the electric heating rod 2 according to the power-on comparison table.

[0087] In some embodiments of the present application, in order to convert solar energy into thermal energy of the water in the water tank 1, the system also includes a heat collection mechanism arranged on the top of the water tank 1, and the heat collection mechanism includes a vacuum isolation cover 6 and a heat collection plate 7.

[0088] The vacuum insulation cover 6 is arranged on the top of the water tank 1; the heat collecting plate 7 is arranged in the vacuum insulation cover 6, and a heat conducting plate 8 is arranged at the bottom, and the heat conducting plate 8 penetrates the vacuum insulation cover 6 and extends into the water tank 1.

[0089] The heat collecting plate 7 is used to receive solar energy and convert the solar energy into thermal energy, and introduce the heat into the water in the water tank 1 through the heat conducting plate 8 .

[0090] In order to further explain the technical solution of this application, the following inventive concepts are now disclosed:

[0091] Invention concept one: According to the water temperature value, air temperature value and water level value in the water tank, the steam flow rate and the power of the electric heating rod are accurately determined to avoid excessive energy consumption. In addition, since the water tank of the power plant stores a large amount of water and the internal temperature is not uniform, in order to reduce the loss of heat energy, according to the water temperature values ​​at different heights in the water tank, the water in the water tank is extracted at the most appropriate height, which further reduces the energy consumed for heating the water.

[0092] Inventive concept two: In order to accurately determine the steam flow rate, it is necessary to preset a steam flow comparison table, which is used to represent the correspondence between air temperature values, water temperature values, water level values ​​and steam flow rates. Then, the air temperature values, water temperature values ​​and water level values ​​are obtained in real time, and the steam flow rate is determined according to the steam flow comparison table.

[0093] Inventive concept three: In order to accurately determine the power of the electric heating rod, it is necessary to preset a power comparison table, which is used to represent the correspondence between air temperature value, water temperature value, water level value and power; then the air temperature value, water temperature value and water level value are obtained in real time, and the power of the electric heating rod is determined according to the power comparison table.

[0094] Inventive concept 4: Using solar energy to heat the water in the water tank reduces the consumption of steam source and power supply.

[0095] The present application discloses a heating system for a water supply tank in a power plant, which heats the water in the water tank by means of the steam heat exchange tube and the electric heating rod, and accurately controls the valve opening of the steam heat exchange tube and the energizing power of the electric heating rod through an analysis and processing module, thereby avoiding excessive consumption of energy.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for heating a water supply tank in a power plant, characterized in that: A water tank, an electric heating rod and a steam heat exchange pipe are used, wherein the electric heating rod is arranged in the water tank, the steam heat exchange pipe is arranged in the water tank and is connected to a steam source; Acquire the water temperature value of the water in the water tank in real time, and adjust the steam flow rate in the steam heat exchange tube according to the water temperature value; If the steam flow rate of the steam heat exchange tube reaches the maximum and the water temperature is lower than the temperature required by the power plant, the electric heating rod is powered on to heat the water in the water tank; The water temperature values ​​of the water at different heights in the water tank are obtained, and the water pumping height is determined according to the water temperature values ​​so as to timely pump out the heated water.

2. The method for heating a water supply tank of a power plant according to claim 1, characterized in that: The method for adjusting the steam flow rate in the steam heat exchange tube comprises: A preset steam flow comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and steam flow amount; The air temperature value, water temperature value and water level value are obtained in real time, and the steam flow rate is determined according to the steam flow comparison table.

3. The method for heating a water supply tank of a power plant according to claim 1, characterized in that: The method for determining the energizing power of the electric heating rod comprises: A preset power-on power comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and power-on power; The air temperature value, water temperature value and water level value are obtained in real time, and the power supply power of the electric heating rod is determined according to the power supply power comparison table.

4. A heating system for a water supply tank in a power plant, characterized in that: include: Water tank; A plurality of electric heating rods are arranged inside the water tank and are used to electrically heat the water in the water tank; A steam heat exchange pipe is arranged in the water tank and connected to a steam source, and is used to heat the water in the water tank; A plurality of water temperature sensors are evenly arranged vertically inside the water tank and are used to obtain the water temperature value of the water in the water tank; an analysis and processing module connected to the water temperature sensor, for receiving the water temperature value monitored by the water temperature sensor, and controlling the valve opening on the steam heat exchange tube according to the water temperature value; if the steam flow of the steam heat exchange tube reaches the maximum and the water temperature value is lower than the temperature value required for water use in the power plant, the electric heating rod is driven to generate heat to heat the water in the water tank; A plurality of water outlet pipes are vertically arranged in the water tank and used for extracting water from the water tank; The analysis and processing module determines the water outlet pipe for water outlet according to the water temperature values ​​measured by the water temperature sensors at different heights, so that the outlet water temperature meets the water demand of the power plant.

5. A heating system for a power plant water supply tank according to claim 4, characterized in that: The heating system also includes a plurality of water outlet pipes arranged vertically; The water temperature sensor is arranged at the pipe mouth of the water outlet pipe.

6. A heating system for a power plant water supply tank according to claim 5, characterized in that: The steam heat exchange pipe comprises a water inlet section, a water outlet section and a spiral section, wherein the water inlet section and the water outlet section are arranged at two ends of the spiral section and extend out of the water tank; The spiral section is arranged in the middle of the water tank and presents a vertical spiral structure.

7. A heating system for a power plant water supply tank according to claim 6, characterized in that: The pipe opening of the water outlet pipe is close to the spiral section of the steam heat exchange pipe.

8. The heating system for a water supply tank of a power plant according to claim 4, characterized in that: The method for adjusting the valve opening on the steam heat exchange tube includes: A preset steam flow comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and valve opening; The analysis and processing module obtains air temperature values, water temperature values ​​and water level values ​​in real time, and determines the valve opening according to the steam flow comparison table.

9. A heating system for a water supply tank in a power plant according to claim 4, characterized in that: The method for determining the energizing power of the electric heating rod comprises: A preset power-on power comparison table is used to indicate the corresponding relationship between air temperature value, water temperature value, water level value and power-on power; The analysis and processing module obtains air temperature value, water temperature value and water level value in real time, and determines the power supply of the electric heating rod according to the power supply comparison table.

10. A heating system for a water supply tank in a power plant according to claim 4, characterized in that: The system further comprises a heat collecting mechanism disposed on the top of the water tank, the heat collecting mechanism comprising: A vacuum isolation cover is arranged on the top of the water tank; The heat collecting plate is arranged in the vacuum insulation cover, and a heat conducting plate is arranged at the bottom. The heat conducting plate penetrates the vacuum insulation cover and extends into the water tank.

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