A steam system for a film-coated furnace and a control method for supplying steam to the film-coated furnace

Abstract

The present invention relates to the technical field of steam equipment, and more specifically, to a steam system for a film-coated furnace and a control method for supplying steam to the film-coated furnace. The film-coated furnace steam system and control method disclosed in the present invention include: a preheating barrel, a boiler, a secondary heating tank, and a film-coated furnace; the preheating barrel is arranged above the boiler; the boiler is fixed on a boiler bracket; the preheating barrel and the boiler are connected to a first steam heating pipe; the steam generated by the boiler enters the secondary heating tank through a second steam heating pipe; the output end of the secondary heating tank is connected to the steam pipe at the top of the film-coated furnace, and an air outlet is provided on the steam pipe, and a butterfly valve is provided on the air inlet pipe at the top of the film-coated furnace. Initially set the power of the boiler or the valve opening of the butterfly valve, monitor in real time whether the oxygen content is lower or higher than the preset value, increase or decrease the valve opening of the butterfly valve, or reduce or increase the power of the boiler. The present invention solves the problem that the steam supply of the existing film-coated furnace is unstable and the oxygen content cannot be accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of steam equipment, and in particular to a steam system for a film-coated furnace and a control method for supplying steam to the film-coated furnace. Background Art

[0002] A coating furnace is a device for coating tantalum capacitors. Coating involves placing tantalum capacitors soaked in manganese nitrate solution into a furnace for multiple thermal decompositions to form a layer of manganese dioxide film. Currently, domestic coating furnaces suffer from unstable steam supply, and the oxygen concentration during thermal decomposition cannot be precisely adjusted and controlled, resulting in the coating effect of the product failing to meet expectations, which in turn affects product quality. Summary of the Invention

[0003] In order to solve the problems of unstable steam supply and inability to accurately control oxygen content in existing film-coated furnaces, the present invention provides a film-coated furnace steam system and a control method for supplying steam to the film-coated furnace.

[0004] According to a first aspect of the present invention, a steam system for a film-coated furnace and a method for controlling steam supply to the film-coated furnace are provided, comprising: a preheating barrel, a boiler, a secondary heating tank, and a film-coated furnace; the preheating barrel is disposed above the boiler; the boiler is fixed to a boiler support; a first steam heating pipe is connected between one side of the preheating barrel and one side of the boiler; a second steam heating pipe is disposed on one side of the boiler, and steam generated by the boiler enters the secondary heating tank through the second steam heating pipe;

[0005] The output end of the secondary heating tank is connected to the input end of the film coating furnace. A steam pipe and an air inlet pipe are provided on the top of the film coating furnace. An air outlet is provided on the steam pipe, and a butterfly valve is provided on the air inlet pipe.

[0006] In some embodiments, the preheating barrel has an L-shaped heating tube, a float switch, a float detection mechanism and a temperature sensor installation tube inside.

[0007] In some embodiments, an overflow pipe is provided on one side of the preheating barrel.

[0008] In some embodiments, the preheating barrel is heated to a temperature in the range of 85°C to 95°C.

[0009] In some embodiments, the secondary heating tank is a vertical rectangular parallelepiped structure.

[0010] In some embodiments, a U-shaped heating tube is provided at the central position inside the secondary heating tank, and a spiral spiral sheet is provided on the U-shaped heating tube.

[0011] In some embodiments, a steam exhaust pipe, a steam inlet pipe and a drain pipe are provided on one side of the secondary heating tank.

[0012] In some embodiments, the secondary heating tank is heated to a temperature in the range of 220°C to 240°C.

[0013] In some embodiments, the initial power of the boiler is set to P1, the initial valve opening of the butterfly valve is set to W1, and the monitoring sensor on the film furnace monitors the oxygen content in the furnace in real time as X1%. The first preset value of the oxygen content is 8%. When X1% is lower than the first preset value, the valve opening of the butterfly valve is increased, which corresponds to increasing the amount of the second preset value, or the power of the boiler is decreased, which corresponds to decreasing the amount of the third preset value. When X1% is higher than the first preset value, the valve opening of the butterfly valve is decreased, which corresponds to decreasing the amount of the second preset value, or the power of the boiler is increased, which corresponds to increasing the amount of the third preset value. When X1% reaches the first preset value, the power of the boiler or the initial valve opening of the butterfly valve is not adjusted.

[0014] In some embodiments, after the valve opening of the butterfly valve or the power of the boiler is adjusted once by the second preset value or the third preset value, if the oxygen content X1% in the film furnace still does not reach the first preset value, wait until the oxygen content reading on the monitoring sensor stabilizes, adjust the valve opening of the butterfly valve or the power of the boiler again until the adjustment reaches the first preset value.

[0015] The present invention has the following beneficial technical effects:

[0016] 1) The preheating method at the front end of the boiler allows the water entering the boiler to be closer to the boiling point of water, which reduces the temperature shock of water to the boiler. In addition, the method of adding water in small amounts and multiple times can make the steam generated by the boiler more stable;

[0017] 2) The steam generated in the boiler is directly fed into the membrane furnace without pressure and risk of blockage;

[0018] 3) The secondary heating tank processes the steam at high temperature, making the steam temperature closer to the working temperature of the membrane and reducing the impact of the steam on the atmosphere in the furnace;

[0019] 4) By adjusting the opening of the butterfly valve on the air inlet duct on the top of the film furnace, the air inlet angle is controlled. Different air inlet angles and different boiler heating powers are used to control the oxygen content in the film furnace to be maintained at 8%. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of an embodiment of the present invention is shown;

[0021] Figure 2 A cross-sectional view of a preheating barrel according to an embodiment of the present invention is shown;

[0022] Figure 3 A cross-sectional view of a secondary heating tank according to an embodiment of the present invention is shown.

[0023] Figure identification: 1-preheating barrel, 2-boiler, 3-secondary heating tank, 4-coating furnace, 5-first steam heating pipe, 6-second steam heating pipe, 7-steam pipe, 8-air inlet pipe, 9-L-shaped heating pipe, 10-float switch, 11-float detection mechanism, 12-temperature sensor installation pipe, 13-overflow pipe, 14-U-shaped heating pipe, 15-steam discharge pipe, 16-steam discharge pipe, 17-drain pipe. DETAILED DESCRIPTION

[0024] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0025] As used herein, the term "including" and variations thereof are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as meaning "at least one embodiment." The term "another embodiment" is to be interpreted as meaning "at least one other embodiment."

[0026] This embodiment discloses a steam system for a film-coated furnace and a method for controlling steam supply to the film-coated furnace. Figure 1 、 Figure 2 and Figure 3 As shown, it may include: the preheating barrel 1 is arranged above the boiler 2; the boiler 2 is fixed on the boiler bracket; one side of the preheating barrel 1 and one side of the boiler 2 are connected to a first steam heating pipe 5; a second steam heating pipe 6 is provided on one side of the boiler 2, and the steam generated by the boiler 2 enters the secondary heating tank 3 through the second steam heating pipe 6;

[0027] The output end of the secondary heating tank 3 is connected to the input end of the film coating furnace 4. The steam pipe 7 and the air inlet pipe 8 are provided on the top of the film coating furnace 4. The steam pipe 7 is provided with an air outlet, and the air inlet pipe 8 is provided with a butterfly valve.

[0028] The temperature range to which the preheating barrel 1 is heated is 85°C-95°C.

[0029] The temperature range to which the secondary heating tank 3 is heated is 220°C-240°C.

[0030] The initial power of the boiler 2 is set to P1, and the initial valve opening of the butterfly valve is set to W1. The monitoring sensor on the film-coated furnace 4 monitors the oxygen content in the furnace in real time at X1%. When X1% is lower than the preset oxygen content value of 8%, the valve opening of the butterfly valve is increased by a corresponding amount of the preset value, or the power of the boiler 2 is decreased by a corresponding amount of the preset value. When X1% is higher than the preset oxygen content value of 8%, the valve opening of the butterfly valve is decreased by a corresponding amount of the preset value, or the power of the boiler 2 is increased by a corresponding amount of the preset value. When X1% reaches the preset oxygen content value of 8%, the power of the boiler 2 or the initial valve opening of the butterfly valve is not adjusted. After the valve opening of the butterfly valve or the power of the boiler 2 is adjusted by a corresponding amount of the preset value, if the oxygen content X1% in the film-coated furnace 4 still does not reach the preset oxygen content value, the valve opening of the butterfly valve or the power of the boiler 2 is adjusted again when the oxygen content reading on the monitoring sensor stabilizes until the preset oxygen content value is reached.

[0031] In this embodiment, cold water is first added into the preheating barrel 1, and the preheating barrel 1 is connected to the boiler 2; a temperature sensor is provided on the preheating barrel 1. Under the detection and control of the temperature sensor, the water temperature preheated to the preheating barrel 1 reaches 85°C-95°C, and is kept close to the boiling point of water. The smaller the temperature impact of the water entering the boiler 2 on the boiler 2, the water heated to 85°C-95°C is passed into the boiler 2 through the first steam heating pipe 5 connected to the preheating barrel 1. After entering the boiler 2, it is heated until the water boils into steam. When the water level in the boiler 2 is short of water, water is added to the boiler 2 in small amounts and multiple times through the preheating barrel 1. The temperature change of the water in the boiler 2 is very small, and the generated steam is more stable. At this time, the steam temperature has not yet reached the working temperature of the membrane, so the steam generated by the boiler 2 is passed into the secondary heating tank 3 for heating treatment to 220°C-240°C. At this time, the steam temperature reaches the working temperature of the membrane The steam is then passed from the output end of the secondary heating tank 3 into the steam pipe 7 provided on the top of the coated furnace 4. The steam is discharged into the coated furnace 4 through the air outlet holes evenly distributed on the steam pipe 7. Air is passed into the air inlet pipe 8 on the coated furnace 4. The steam and air introduced into the coated furnace 4 are mixed. The initial power P1 of the boiler 2 and the initial valve opening W1 of the butterfly valve are preset. The monitoring sensor on the coated furnace 4 monitors the oxygen content in the furnace at X1% in real time. When X1% is lower than the preset oxygen content value of 8%, the valve opening of the butterfly valve is increased by 10° at a time, or the power of the boiler 2 is decreased by 4.8kw at a time. When X1% is higher than the preset oxygen content value of 8%, the valve opening of the butterfly valve is decreased by 10° at a time, or the power of the boiler 2 is increased by 4.8kw at a time. When X1% reaches the preset oxygen content value of 8%, the power of the boiler 2 or the initial valve opening of the butterfly valve is not adjusted. After the valve opening of the butterfly valve or the power of boiler 2 is adjusted once to the preset value, if the oxygen content in the film furnace X1% still does not reach the preset oxygen content value, wait until the oxygen content reading on the monitoring sensor stabilizes, adjust the valve opening of the butterfly valve or the power of boiler 2 again until the preset oxygen content value is reached.

[0032] Preferably, the water temperature in the preheating barrel 1 is heated to 90°C.

[0033] Preferably, the steam generated by the boiler is heated to 230° C. through the secondary heating tank 3 .

[0034] In some embodiments, the preheating barrel 1 has an L-shaped heating tube 9, a float switch 10, a float detection mechanism 11 and a temperature sensor installation tube 12 inside.

[0035] In this embodiment, multiple groups of L-shaped heating tubes 9 are installed at the bottom of the preheating barrel 1. These L-shaped heating tubes are compact, offer high heating power, and generate stable heat. A float switch 10 is installed horizontally in the preheating barrel 1. One end of the float switch 10 is connected to a float ball. When the water level in the preheating barrel 1 reaches the float ball's position, the float ball floats upward, and the contact of the reed switch at the other end of the float ball's connecting rod closes. A float detection mechanism 11 is installed vertically in the preheating barrel 1 to accurately measure the water level in the preheating barrel 1, controlling the water level or providing a water level warning signal. Furthermore, a temperature sensor mounting tube 12 is installed vertically in the preheating barrel 1 for mounting a temperature sensor. This temperature sensor controls the heating of the preheating barrel 1's replenishing water to a temperature of 85°C-95°C, keeping the water entering the boiler 2 close to its boiling point. This minimizes the temperature shock of the water to the boiler 2 and results in a more stable steam output.

[0036] In some embodiments, an overflow pipe 13 is provided on one side of the preheating barrel 1 .

[0037] In this embodiment, an overflow pipe 13 is provided on one side of the preheating barrel 1. When the water in the preheating barrel 1 exceeds the maximum water level, the excess water is quickly discharged through the overflow pipe 13, so that the water level in the preheating barrel 1 is maintained at a height not exceeding the maximum water level.

[0038] In some embodiments, the secondary heating tank 3 is a vertical rectangular parallelepiped structure.

[0039] In this embodiment, the secondary heating tank 3 is a vertical rectangular parallelepiped structure as a whole, which heats quickly and has a good heat preservation effect.

[0040] In some embodiments, a U-shaped heating tube 14 is provided at the central position inside the secondary heating tank 3 , and a spiral spiral sheet is provided on the U-shaped heating tube 14 .

[0041] In this embodiment, spiral spiral blades are evenly distributed on the U-shaped heating tube 14 located in the center of the secondary heating tank 3, which can increase the contact area, guide the flow of steam in the U-shaped heating tube 14, and promote uniform heating of the steam in the U-shaped heating tube 14.

[0042] In some embodiments, a steam exhaust pipe 15 , a steam discharge pipe 16 and a drain pipe 17 are provided on one side of the secondary heating tank 3 .

[0043] In this embodiment, a steam exhaust pipe 15, a steam inlet pipe 16, and a drain pipe 17 are sequentially provided on one side of the secondary heating tank 3. The steam is discharged into the film-coated furnace 4 through the steam exhaust pipe 15 provided on the side of the secondary heating tank 3. The output end of the steam exhaust pipe 15 is connected to the input end of the steam pipe 7 of the film-coated furnace 4, so that the steam heated to 220°C-240°C by the secondary heating tank 3 can quickly and directly enter the film-coated furnace 4. The steam inlet pipe 16 provided on the side of the secondary heating tank 3 is connected to the second steam heating pipe 6 of the boiler 2, and the steam heated in the boiler 2 is passed into the secondary heating tank 3. At the same time, a drain pipe 17 is provided below the steam inlet pipe 16, through which the condensed water generated after the operation of the secondary heating tank 3 is discharged.

[0044] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A method for controlling steam supply to a film-coated furnace, the method using a film-coated furnace steam system, characterized in that: The steam system of the film-coated furnace includes: a preheating barrel, a boiler, a secondary heating tank, and a film-coated furnace; the preheating barrel is arranged above the boiler; the boiler is fixed to a boiler bracket; a first steam heating pipe is connected between one side of the preheating barrel and one side of the boiler; a second steam heating pipe is provided on one side of the boiler, and steam generated by the boiler enters the secondary heating tank through the second steam heating pipe; The output end of the secondary heating tank is connected to the input end of the film coating furnace. A steam pipe and an air inlet pipe are provided on the top of the film coating furnace. An air outlet is provided on the steam pipe, and a butterfly valve is provided on the air inlet pipe. The control method includes: the initial power of the boiler is set to P1, the initial valve opening of the butterfly valve is set to W1, the monitoring sensor on the film furnace monitors the oxygen content in the film furnace in real time as X1%, and the first preset value of the oxygen content is 8%. When X1% is lower than the first preset value, the valve opening of the butterfly valve is increased, which corresponds to an increase by the second preset value, or the power of the boiler is reduced, which corresponds to a decrease by the third preset value. When X1% is higher than the first preset value, the valve opening of the butterfly valve is reduced, which corresponds to a decrease by the second preset value, or the power of the boiler is increased, which corresponds to an increase by the third preset value. When X1% reaches the first preset value, the power of the boiler or the initial valve opening of the butterfly valve is not adjusted.

2. A method for controlling steam supply to a coating furnace according to claim 1, characterized in that: The preheating barrel is internally provided with an L-shaped heating tube, a float switch, a float detection mechanism and a temperature sensor installation tube.

3. The method for controlling steam supply to a coating furnace according to claim 1, characterized in that: An overflow pipe is provided on one side of the preheating barrel.

4. The method for controlling steam supply to a coating furnace according to claim 1, characterized in that: The temperature range to which the preheating barrel is heated is 85°C-95°C.

5. The method for controlling steam supply to a film coating furnace according to claim 1, characterized in that: The secondary heating tank is a vertical rectangular parallelepiped structure.

6. The method for controlling steam supply to a coating furnace according to claim 1, characterized in that: A U-shaped heating tube is provided at the central position inside the secondary heating tank, and a spiral spiral sheet is provided on the U-shaped heating tube.

7. The method for controlling steam supply to a coating furnace according to claim 1, characterized in that: A steam discharge pipe, a steam discharge pipe and a drain pipe are provided on one side of the secondary heating tank.

8. The method for controlling steam supply to a coating furnace according to claim 1, characterized in that: The temperature range to which the secondary heating tank is heated is 220°C-240°C.

9. The method for controlling steam supply to a coating furnace according to claim 1, characterized in that: After the valve opening of the butterfly valve or the power of the boiler is adjusted once by the second preset value or the third preset value, if the oxygen content X1% in the film furnace still does not reach the first preset value, wait until the oxygen content reading on the monitoring sensor stabilizes, adjust the valve opening of the butterfly valve or the power of the boiler again until the adjustment reaches the first preset value.

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