A high-temperature high-pressure steam boiler and a control method thereof

Abstract

The application relates to the technical field, in particular to a high-temperature and high-pressure steam boiler, and simultaneously discloses a control method of the high-temperature and high-pressure steam boiler; the boiler body is internally provided with a vaporization cavity, and the bottom of the boiler body is provided with a heating assembly; an extension seat is arranged on the upper end plate of the boiler body, a cover plate is encapsulated on the upper end of the extension seat, so that a separation cavity is formed among the cover plate, the extension seat and the boiler body, an exhaust nozzle is arranged on the cover plate, a first valve seat is arranged on the upper end plate of the boiler body, a pressure control assembly is arranged in the first valve seat, and the gas outlet of the first valve seat and the exhaust nozzle are horizontally and left-right spaced apart; the high-temperature and high-pressure steam boiler can conduct the temperature of the boiler body to the separation cavity, the temperature attenuation of steam passing through the separation cavity is reduced, the condensation amount is smaller, steam is sprayed on the cover plate from the first valve seat, hot steam impacts the cover plate to change the path and obtain a water-steam separation effect, and water drops stay in the separation cavity under the action of gravity, so that more dry high-temperature steam is obtained.

Description

Technical Field

[0001] This invention relates to the technical field, specifically to a high-temperature and high-pressure steam boiler, and also discloses a control method for the high-temperature and high-pressure steam boiler. Background Technology

[0002] With the development of technology, various devices are emerging, bringing more convenience to people's lives. Steam is a high-temperature heat medium formed by heating and vaporizing water. It can be used for power transmission and heat transfer. In the food processing industry, hot steam is widely used for steaming, such as egg steamers, steam pots, and steam ovens. The core component of products that use hot steam is the steam generator. Traditional steam generators are collectively called boilers, which are devices that heat water in a closed container to a critical temperature to vaporize and form steam.

[0003] Chinese Patent CN1593303C discloses a superheated steam oven, including a cabinet defining a cooking chamber. A superheated steam generator supplies superheated steam to the cooking chamber. A steam scattering unit connects the cooking chamber and a steam cooling device. The steam scattering unit has a box-shaped cover that protrudes inward from the inner surface of the rear wall of the cooking chamber. The front of the box-shaped cover is closed, and multiple steam release holes a and b formed around the cover release superheated steam into the cooking chamber. The multiple steam release holes a and b of the steam scattering unit are typically formed on the side wall and lower end wall of the steam scattering unit.

[0004] In this existing technology, the superheated steam generator delivers vaporized superheated steam into the cooking chamber via a steam scattering unit. This superheated steam contains a large amount of moisture. Since most superheated steam ovens are now electronic products, superheated steam condensation inside the cooking chamber can affect equipment safety, and superheated steam condensation on food can damage food quality. In particular, the steam generators used in existing superheated steam ovens produce steam slowly, and the temperature of the superheated steam easily decreases during transmission, affecting cooking efficiency. Therefore, this existing technology requires improvement and development. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a high-temperature and high-pressure steam boiler with a reasonable structure, high steam generation efficiency, and low steam moisture content, as well as its control method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention discloses a high-temperature, high-pressure steam boiler, comprising a boiler body with a vaporization chamber inside and a heating assembly at the bottom of the boiler body. An extension seat is provided on the upper end plate of the boiler body, and a cover plate is sealed on the upper port of the extension seat, thus forming a separation chamber between the cover plate, the extension seat, and the boiler body. An exhaust nozzle is provided on the cover plate. A first valve seat is provided on the upper end plate of the boiler body, with its inlet connected to the vaporization chamber via a hole. A pressure control assembly is provided inside the first valve seat, and its outlet and the exhaust nozzle are spaced horizontally at an interval. The boiler body has a hollow structure, thus forming a vaporization chamber inside. Water is injected into the vaporization chamber, and the heating assembly heats up, causing the water in the vaporization chamber to vaporize into hot steam. The first valve seat establishes a steam flow path between the vaporization chamber and the separation chamber, and the first valve seat contains a pressure control assembly that controls the opening and closing of this flow path, thereby increasing the pressure in the vaporization chamber to obtain steam at a higher temperature.

[0008] Preferably, the first valve seat and the exhaust nozzle are offset to the left and right. When the pressure in the vaporization chamber exceeds the set value of the pressure control component, steam is sprayed from the first valve seat to the cover plate. The water molecules carried in the steam and the water droplets formed under the condensation will hang on the bottom surface of the cover plate. Under the action of gravity, the water droplets fall into the separation chamber, while the steam changes the flow direction and is discharged from the exhaust nozzle. The exhaust nozzle is connected to the gas-using device to obtain drier steam.

[0009] Furthermore, the extension seat and the pot body are integrally formed. When the heating component heats the pot body, the heat is conducted to the extension seat and the separation chamber, thereby reducing the temperature drop of steam flowing through the separation chamber and reducing the generation of condensate, thus obtaining steam at a higher temperature.

[0010] According to the above scheme, a buffer cap is provided on the cover plate. The buffer cap protrudes upward, thus forming a buffer cavity between itself and the cover plate. The exhaust nozzle is located on one side of the buffer cap, and the exhaust port of the first valve seat faces upward and points towards the buffer cavity. The buffer cavity formed by the buffer cap is above the end face of the cover plate, while the exhaust nozzle is located on the cover plate, creating a height difference with the buffer cavity. High-temperature steam ejected from the first valve seat first enters the buffer cavity and is sprayed onto the buffer cap. The steam impacts the buffer cap, changes its flow path, and is then ejected from the exhaust nozzle. It can be understood that the buffer cavity is located relatively high, and there is a downward staged path for the steam as it flows from the buffer cavity to the exhaust nozzle. Along this path, condensate is carried by the airflow to the bottom of the separation chamber, thereby reducing the water content in the superheated steam, and especially preventing condensate from flowing towards the gas-using device.

[0011] According to the above scheme, the upper end of the first valve seat is provided with a first valve cover, and the air outlet is opened on the first valve cover; the pressure control component includes a first steel ball, a first spring, and a first push rod. The first steel ball is movably disposed at the air inlet of the first valve seat, and the lower end of the first push rod is in contact with the first steel ball; the lower end of the first spring is connected to the first push rod, the upper end of the first spring is in contact with the first valve cover, and the upper end of the first push rod is movably disposed in the air outlet. The air inlet of the first valve seat communicates with the vaporization chamber through a hole. The first steel ball is disposed at the air inlet of the first valve seat. The first spring drives the first push rod to apply a downward force, causing the first steel ball to cut off the hole connection between the first valve seat and the vaporization chamber. The above arrangement enables the heating component to increase the pressure in the vaporization chamber during operation, thereby improving the steam generation efficiency and obtaining superheated steam at a higher temperature. When the pressure inside the vaporization chamber exceeds the force applied by the first spring, the first push rod moves upward along the air outlet, and the pressure inside the vaporization chamber pushes the first steel ball away, allowing the steam inside the vaporization chamber to flow from the first valve seat to the buffer chamber.

[0012] According to the above scheme, a pressure relief valve is provided in the separation chamber. The pressure relief valve is fixedly installed on the upper end plate of the pot body, and the pressure relief valve is connected to the vaporization chamber through a hole. The set pressure value of the pressure relief valve is greater than the set pressure of the pressure control component. The pressure relief valve can only be opened when the pressure control component on the first valve seat fails, so as to prevent the pressure in the vaporization chamber of the pot body from becoming too high.

[0013] According to the above scheme, a reflux hole is provided on the upper end plate of the pot body, which connects the separation chamber and the vaporization chamber. A reflux valve rod that can move up and down along the reflux hole is provided on the reflux hole, and a sealing disc is provided at the lower end of the reflux valve rod. When the heating component is working, the temperature and pressure in the vaporization chamber rise, causing the sealing disc to block the reflux hole. When the pressure in the vaporization chamber drops, the reflux valve rod will drive the sealing disc to descend under the action of gravity. At this time, the sealing disc cannot completely block the reflux hole, and thus the condensate in the separation chamber flows into the vaporization chamber from the reflux hole.

[0014] According to the above scheme, the pot body is equipped with a first temperature sensor, and the heating assembly is equipped with a second temperature sensor and a snap-on temperature controller. The first temperature sensor monitors the temperature inside the vaporization chamber in real time, and at the same time, the pressure inside the vaporization chamber can be calculated and judged based on the temperature-pressure ratio. The second temperature sensor and the snap-on temperature controller monitor the working status of the heating assembly in real time to prevent malfunctions such as overpressure and overheating.

[0015] According to the above scheme, the side wall of the boiler body is provided with a water inlet connected to the vaporization chamber, and the water inlet is connected to a water pump. The bottom of the boiler body is provided with a drain outlet connected to a solenoid valve. It also includes a main control circuit board, which is connected to the heating assembly, water pump, solenoid valve, first temperature sensor, second temperature sensor, and snap-action thermostat. The main control circuit board has a microprocessor and can be a controller component of a steam-using equipment. The water pump and solenoid valve are auxiliary accessories of the steam-using equipment. The main control circuit controls the feedback signals from the heating assembly, water inlet valve, solenoid valve, snap-action thermostat, first temperature sensor, and second temperature sensor to adjust the boiler's operating status in real time.

[0016] Preferably, the water pump is controlled in real time by the main control circuit board to add water to the vaporization chamber in small amounts and multiple times. The frequency and amount of water added are based on the feedback data of the first temperature sensor and the second temperature sensor, thereby achieving precise water control and improving steam generation efficiency.

[0017] Of course, the main control circuit board can monitor the boiler's operating status in real time and automatically shut down the heating components when faults such as overpressure or overheating occur. Furthermore, the main control circuit board can automatically control the solenoid valve connected to the drain outlet to discharge residual water and steam from the vaporization chamber.

[0018] A control method for a high-temperature, high-pressure steam boiler includes the following steps: When the heating assembly is activated by the main control circuit board, a first temperature sensor and a second temperature sensor provide real-time feedback signals to the main control circuit board. Based on the temperature and steam generation rate within the vaporization chamber, the main control circuit board controls the water pump to inject water into the vaporization chamber in small, intermittent increments to maintain a low water level. When the heating assembly is deactivated, the main control circuit board controls the water pump to inject water into the vaporization chamber, and the first temperature sensor provides feedback signals to the main control circuit board. When the temperature within the vaporization chamber drops to a set value, the main control circuit board activates a solenoid valve to discharge the water and pressure from the vaporization chamber through a drain outlet.

[0019] According to the above scheme, the main control circuit board controls the solenoid valve to intermittently open and close the drain port multiple times until the pressure in the vaporization chamber drops below a safe value. The solenoid valve intermittently opens in pressure relief and drainage mode to prevent the residual pressure in the vaporization chamber from causing a jet of water and posing a safety risk.

[0020] The present invention discloses a high-temperature and high-pressure steam boiler and its control method. An extension seat is provided on the boiler body so that the boiler body temperature can be conducted to the separation chamber. The temperature attenuation of steam when passing through the separation chamber is reduced and the condensation is smaller. Steam is sprayed from the first valve seat onto the cover plate. The hot steam impacts the cover plate and changes its path to achieve water-steam separation effect. Water droplets remain in the separation chamber under the action of gravity, thereby obtaining drier high-temperature steam. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall disassembled structure of the present invention;

[0022] Figure 2 This is a top view of the overall structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the overall bottom view of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the extension seat of the present invention;

[0025] Figure 5 This is a schematic diagram of the vertical cross-sectional structure of the pressure control component and pressure relief valve of the present invention;

[0026] Figure 6 This is a schematic diagram of the vertical cross-sectional structure at the reflux hole of the present invention;

[0027] Figure 7 This is a schematic diagram of the control method of the present invention.

[0028] In the picture:

[0029] 1. Pot body; 2. Extension seat; 3. Cover plate; 4. First temperature sensor; 5. Second temperature sensor; 6. Snap-on thermostat; 11. Vaporization chamber; 12. Heating assembly; 13. Return hole; 14. Return valve stem; 15. Sealing disc; 16. Water inlet; 17. Drain outlet; 21. Separation chamber; 22. First valve seat; 23. First valve cover; 24. Air outlet; 25. First steel ball; 26. First spring; 27. First push rod; 28. Pressure relief valve; 31. Exhaust nozzle; 32. Buffer cap; 33. Buffer chamber. Detailed Implementation

[0030] The technical solution of the present invention will be described below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1-6As shown, the high-temperature and high-pressure steam boiler of the present invention includes a boiler body 1, a vaporization chamber 11 inside the boiler body 1, and a heating component 12 at the bottom of the boiler body 1. An extension seat 2 is provided on the upper end plate of the boiler body 1, and a cover plate 3 is sealed on the upper port of the extension seat 2, thereby forming a separation chamber 21 between the cover plate 3, the extension seat 2, and the boiler body 1. An exhaust nozzle 31 is provided on the cover plate 3. A first valve seat 22 is provided on the upper end plate of the boiler body 1. The air inlet of the first valve seat 22 is connected to the vaporization chamber 11 through a hole. A pressure control component is provided inside the first valve seat 22. The air outlet 24 of the first valve seat 22 and the exhaust nozzle 31 are spaced apart horizontally on the horizontal plane. The boiler body 1 has a hollow structure, thus forming the vaporization chamber 11 inside. Water is injected into the vaporization chamber 11, and the heating component 12 heats up, causing the water in the vaporization chamber 11 to vaporize and form hot steam. The first valve seat 22 establishes a steam flow path between the vaporization chamber 11 and the separation chamber 21. The first valve seat 22 is provided with a pressure control component that controls the opening and closing of the flow path, thereby increasing the pressure in the vaporization chamber 11 to obtain steam at a higher temperature.

[0032] Preferably, the first valve seat 22 and the exhaust nozzle 31 are offset to the left and right. When the pressure in the vaporization chamber 11 exceeds the set value of the pressure control component, steam is sprayed from the first valve seat 22 onto the cover plate 3. The water molecules carried in the steam and the water droplets formed under the action of condensation will hang on the bottom surface of the cover plate 3. Under the action of gravity, the water droplets fall into the separation chamber 21, while the steam changes the flow direction and is discharged from the exhaust nozzle 31. The exhaust nozzle 31 is connected to the gas-using device to obtain drier steam.

[0033] Furthermore, the extension seat 2 and the pot body 1 are integrally formed. When the heating component 12 heats the pot body 1, the heat will be conducted to the extension seat 2 and the separation chamber 21, thereby reducing the temperature drop of steam flowing through the separation chamber 21 and reducing the generation of condensate, thus obtaining steam at a higher temperature.

[0034] A buffer cap 32 is provided on the cover plate 3. The buffer cap 32 protrudes upward, thus forming a buffer cavity 33 between itself and the cover plate 3. The exhaust nozzle 31 is located on one side of the buffer cap 32. The air outlet 24 of the first valve seat 22 faces upward and points towards the buffer cavity 33. The buffer cavity 33 formed by the buffer cap 32 is located above the end face of the cover plate 3, while the exhaust nozzle 31 is located on the cover plate 3, creating a height difference with the buffer cavity 33. High-temperature steam ejected from the first valve seat 22 first enters the buffer cavity 33 and is sprayed onto the buffer cap 32. After the steam impacts the buffer cap 32 and changes its flow path, it is ejected from the exhaust nozzle 31. It can be understood that the buffer cavity 33 is located relatively high, and there is a downward staged path when the steam flows from the buffer cavity 33 to the exhaust nozzle 31. On this path, the condensate is carried by the airflow to the bottom of the separation chamber 21, thereby reducing the water content in the superheated steam, and especially preventing the condensate from flowing towards the gas-using device.

[0035] The upper end of the first valve seat 22 is provided with a first valve cover 23, and an air outlet 24 is opened on the first valve cover 23. The pressure control assembly includes a first steel ball 25, a first spring 26, and a first push rod 27. The first steel ball 25 is movably disposed at the air inlet of the first valve seat 22, and the lower end of the first push rod 27 is in contact with the first steel ball 25. The lower end of the first spring 26 is connected to the first push rod 27, and the upper end of the first spring 26 is in contact with the first valve cover 23. The upper end of the first push rod 27 is movably disposed in the air outlet 24. The air inlet of the first valve seat 22 communicates with the vaporization chamber 11 through a hole. The first steel ball 25 is disposed at the air inlet of the first valve seat 22. The first spring 26 drives the first push rod 27 to apply a downward force, causing the first steel ball 25 to cut off the hole connection between the first valve seat 22 and the vaporization chamber 11. The above configuration enables the heating assembly 12 to increase the pressure within the vaporization chamber 11 during operation, thereby improving steam generation efficiency and obtaining superheated steam at a higher temperature. When the pressure within the vaporization chamber 11 exceeds the force applied by the first spring 26, the first push rod 27 moves upward along the outlet 24, and the pressure within the vaporization chamber 11 pushes open the first steel ball 25, allowing the steam within the vaporization chamber 11 to flow from the first valve seat 22 to the buffer chamber 33.

[0036] The separation chamber 21 is equipped with a pressure relief valve 28, which is fixedly installed on the upper end plate of the pot body 1 and is connected to the vaporization chamber 11 through a hole. The set pressure value of the pressure relief valve 28 is greater than the set pressure of the pressure control component. The pressure relief valve 28 can only be opened when the pressure control component on the first valve seat 22 fails, so as to prevent excessive pressure in the vaporization chamber 11 inside the pot body 1.

[0037] The upper plate of the pot body 1 is provided with a reflux hole 13, which connects the separation chamber 21 and the vaporization chamber 11. A reflux valve rod 14, which can move up and down along the reflux hole 13, is provided at the lower end of the reflux valve rod 14. When the heating component 12 is working, the temperature and pressure in the vaporization chamber 11 increase, causing the sealing disc 15 to block the reflux hole 13. When the pressure in the vaporization chamber 11 decreases, the reflux valve rod 14 will drive the sealing disc 15 to descend under the action of gravity. At this time, the sealing disc 15 cannot completely block the reflux hole 13, and thus the condensate in the separation chamber 21 flows into the vaporization chamber 11 from the reflux hole 13.

[0038] The pot body 1 is equipped with a first temperature sensor 4, and the heating assembly 12 is equipped with a second temperature sensor 5 and a snap-on temperature controller 6. The first temperature sensor 4 monitors the temperature inside the vaporization chamber 11 in real time. At the same time, it can calculate and judge the pressure inside the vaporization chamber 11 based on the temperature-pressure ratio. The second temperature sensor 5 and the snap-on temperature controller 6 monitor the working status of the heating assembly 12 in real time to prevent malfunctions such as overpressure and overheating.

[0039] The side wall of the boiler body 1 is provided with a water inlet 16 that connects to the vaporization chamber 11. The water inlet 16 is connected to a water pump. The bottom of the boiler body 1 is provided with a drain outlet 17 that connects to a solenoid valve. The boiler also includes a main control circuit board, which is connected to the heating assembly 12, the water pump, the solenoid valve, the first temperature sensor 4, the second temperature sensor 5, and the snap-action thermostat 6. The main control circuit board has a microprocessor and can be a controller component of a steam-using equipment. The water pump and the solenoid valve are auxiliary accessories of the steam-using equipment. The main control circuit board adjusts the boiler's operating status in real time based on feedback signals from the heating assembly 12, the water inlet valve, the solenoid valve, the first temperature sensor 4, the second temperature sensor 5, and the snap-action thermostat 6.

[0040] Preferably, the water pump is controlled in real time by the main control circuit board to add water to the vaporization chamber 11 in small amounts and multiple times. The frequency and amount of water added are based on the feedback data of the first temperature sensor 4 and the second temperature sensor 5, thereby achieving precise water control and improving steam generation efficiency.

[0041] Of course, the main control circuit board can monitor the boiler's operating status in real time and automatically shut down the heating component 12 when faults such as overpressure or overheating occur. Furthermore, the main control circuit board can automatically control the solenoid valve connected to the drain port 17 to discharge residual water and steam from the vaporization chamber 11.

[0042] like Figure 7 As shown, a control method for a high-temperature and high-pressure steam boiler is described. When the main control circuit board starts the heating component 12, the first temperature sensor 4 and the second temperature sensor 5 provide real-time feedback signals to the main control circuit board. Based on the temperature and steam generation rate within the vaporization chamber 11, the main control circuit board controls the water pump to inject water into the vaporization chamber 11 in small, sequential amounts to maintain the water level in the vaporization chamber 11 at a low level. When the main control circuit board shuts off the heating component 12, it controls the water pump to inject water into the vaporization chamber 11, and the first temperature sensor 4 provides feedback signals to the main control circuit board. When the temperature within the vaporization chamber 11 drops to a set value, the main control circuit board activates the solenoid valve to discharge the water and pressure from the vaporization chamber 11 through the drain port 17.

[0043] The main control circuit board controls the solenoid valve to intermittently open and close the drain port 17 multiple times until the pressure in the vaporization chamber 11 drops below a safe value. The solenoid valve intermittently opens in a pressure relief and drainage mode to prevent the residual pressure in the vaporization chamber 11 from causing a jet of water and posing a safety risk.

[0044] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A high-temperature and high-pressure steam boiler, comprising a boiler body, a vaporization cavity arranged in the boiler body, and a heating assembly arranged at the bottom of the boiler body; characterized in that an extension seat is arranged on the upper end plate of the boiler body, a cover plate is arranged on the upper end of the extension seat, and a separation cavity is formed between the cover plate, the extension seat and the boiler body; an exhaust nozzle is arranged on the cover plate, a first valve seat is arranged on the upper end plate of the boiler body, an air inlet of the first valve seat is communicated with the vaporization cavity through a hole, a pressure control assembly is arranged in the first valve seat, and the air outlet of the first valve seat is arranged horizontally and spaced apart from the exhaust nozzle; a buffer cap is arranged on the cover plate, the buffer cap is upwardly protruded to form a buffer cavity between the buffer cap and the cover plate, the exhaust nozzle is arranged on one side of the buffer cap, and the air outlet of the first valve seat is upwardly directed to the buffer cavity. a first valve cover is arranged at the upper end of the first valve seat, and the air outlet is arranged on the first valve cover; the pressure control assembly comprises a first steel ball, a first spring and a first push rod, the first steel ball is movably arranged at the air inlet of the first valve seat, the lower end of the first push rod is in abutting connection with the first steel ball, the lower end of the first spring is in cooperation connection with the first push rod, the upper end of the first spring is in abutting connection with the first valve cover, and the upper end of the first push rod is movably arranged in the air outlet.

2. The high temperature high pressure steam boiler as claimed in claim 1, wherein, a pressure relief valve is arranged in the separation cavity, and the pressure relief valve is fixedly arranged on the upper end plate of the boiler body and communicated with the vaporization cavity through a hole.

3. The high temperature high pressure steam boiler as claimed in claim 1 wherein, a backflow hole is arranged on the upper end plate of the boiler body, and the backflow hole is communicated with the separation cavity and the vaporization cavity; a backflow valve rod is movably arranged in the backflow hole, and a sealing disc is arranged at the lower end of the backflow valve rod.

4. The high temperature high pressure steam boiler as claimed in claim 1, wherein, a first temperature sensor is arranged on the boiler body, and a second temperature sensor and a jump temperature controller are arranged on the heating assembly.

5. A high temperature high pressure steam boiler according to claim 4, characterized in that a water inlet is arranged on the side wall of the boiler body and communicated with the vaporization cavity, the water inlet is connected with a water pump, a drain outlet is arranged at the bottom of the boiler body and connected with a solenoid valve; a main control circuit board is further arranged, and the main control circuit board is connected with the heating assembly, the water pump, the solenoid valve, the first temperature sensor, the second temperature sensor and the jump temperature controller.

6. The high temperature high pressure steam boiler as claimed in claim 5, wherein, 7. The control method of the high-temperature and high-pressure steam boiler according to claim 6, characterized in that: when the main control circuit board starts the heating assembly, the first temperature sensor and the second temperature sensor feed signals to the main control circuit board in real time; based on the temperature and the steam generation speed in the vaporization cavity, the main control circuit board controls the water pump to inject water into the vaporization cavity in small amounts and in several times, so that the water level in the vaporization cavity is maintained at a low water level; when the main control circuit board stops the heating assembly, the main control circuit board controls the water pump to inject water into the vaporization cavity, the first temperature sensor feeds signals to the main control circuit board, and when the temperature in the vaporization cavity decreases to a set value, the main control circuit board starts the solenoid valve to discharge the water and pressure in the vaporization cavity through the drain outlet. The main control circuit board controls the solenoid valve to open and close the drain outlet intermittently for several times until the pressure in the vaporization cavity decreases to below a safety value.

8. The control method of a high-temperature high-pressure steam boiler according to claim 7, characterized by: ​

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