Water temperature regulation and heat utilization device for phosphorus-containing wastewater sedimentation tank in yellow phosphorus production

Abstract

The utility model discloses a water temperature regulating and heat utilization device for a phosphorus-containing wastewater sedimentation tank in phosphorus production, comprising a heat exchange tank, a temperature regulating tank, a water temperature regulating component, a heat utilization component and a controller, wherein the temperature regulating tank is arranged at one side of the heat exchange tank, the heat utilization component is installed on the heat exchange tank, the heat utilization component comprises an air pump, a heat exchange pipe group and a stirring group, the water temperature regulating component is arranged on the temperature regulating tank body, and the water temperature regulating component comprises a temperature regulating pipe group and a refrigeration air conditioner; the utility model combines the heat exchange tank, the temperature regulating tank, the water temperature regulating component, the heat utilization component and the controller, and under the condition of meeting environmental protection requirements, the heat in the wastewater discharged from the yellow phosphorus production can be recovered and then transported to other workshops for drying or preheating, thereby effectively reducing the waste of energy and quickly reducing the temperature of the wastewater for subsequent treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of yellow phosphorus production and processing, in particular to a water temperature regulating and heat utilizing device for a phosphorus-containing wastewater sedimentation tank in yellow phosphorus production. Background Art

[0002] my country's total yellow phosphorus output ranks first in the world. Yellow phosphorus is an important basic industrial raw material, mainly used in chemical, In the fields of pesticides, the production of yellow phosphorus consumes a lot of energy and has a great impact on the surrounding environment. It is a high-energy consumption and high-pollution industry. The main component of the tail gas in the production of yellow phosphorus is carbon monoxide, and other impurities include organic sulfur, inorganic sulfur and dust. If the tail gas of yellow phosphorus is discharged by high-altitude combustion, it will waste energy and pollute the environment. At the same time, the tail gas of yellow phosphorus can be used to produce sodium formate. Sodium formate is toxic and decomposes into hydrogen and sodium oxalate when strongly heated. When yellow phosphorus is produced, a large amount of water is used, mainly the sewage discharged from high-temperature slag quenching, fine washing tanks, and scrubbing towers. The sewage in the production of yellow phosphorus contains a lot of heat and more harmful components (phosphorus, arsenide, cyanide, fluoride, sulfide, etc.). The phosphorus-containing wastewater mainly includes phosphate ions and hypophosphite ions. The discharge of phosphorus-containing wastewater will lead to eutrophication of water bodies and affect aquaculture. The concentration of yellow phosphorus production sewage is relatively high, so the sewage must be purified before it can be reused or discharged.

[0003] At present, when treating yellow phosphorus production wastewater, the wastewater is generally placed in a sedimentation tank for heat dissipation, cooling and sedimentation before being transported to the next treatment equipment for recycling. When the wastewater in the sedimentation tank dissipates heat, hot air and water mist will float in the air. There are also some harmful substances remaining in the water mist that can easily pollute the environment. Therefore, the environmental protection department requires that the top surface of the sedimentation tank be covered, and the hot air and water mist must be collected and purified before being discharged.

[0004] However, after the top of the sedimentation tank was sealed, although the diffusion of hot air and water mist was effectively reduced, it also greatly affected the heat dissipation effect of the wastewater in the tank, greatly reduced the efficiency of sewage treatment, and brought great troubles to the production unit. Summary of the invention

[0005] In order to solve the above problems, the utility model provides a settling tank water temperature regulating and heat utilization device which can quickly reduce the temperature of wastewater in the settling tank without diffusing hot air and water mist.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a water temperature regulating and heat utilization device for a phosphorus-containing wastewater sedimentation tank in yellow phosphorus production, comprising a heat exchange tank, a temperature regulating tank, a water temperature regulating component, a heat utilization component and a controller, wherein the controller is arranged at a position convenient for observation and operation, a sealing cover is installed on the top surface of the heat exchange tank, a flue gas duct is installed on the sealing cover, a slag discharge pipe with a valve is installed on the bottom of the tank body, a water inlet pipe is installed on the upper part, a water outlet pipe is installed on the lower part opposite thereto, and a solenoid valve is installed on the water outlet pipe, the solenoid valve is connected to the controller through a wire, a liquid level sensor is installed on the upper side wall of the tank body, a temperature sensor is installed on the middle side wall, and the two sensors are electrically connected to the controller for signal transmission.

[0007] The temperature regulating pool is arranged on one side of the heat exchange pool, and the horizontal height of the bottom surface of the temperature regulating pool is lower than the horizontal height of the bottom surface of the heat exchange pool. The water inlet pipe of the temperature regulating pool is connected with the water outlet pipe of the heat exchange pool, and the lower part opposite to it is equipped with a water outlet pipe, and a slag discharge pipe with a bag valve is installed at the bottom, and a liquid level sensor and a temperature sensor are also installed in the pool body. An overflow chamber is provided in the pool body below the water inlet pipe side of the temperature regulating pool, and the overflow chamber is an independent chamber formed by three partitions assembled and matched with the inner wall of the temperature regulating pool, and the height of the partition is lower than the height of the water inlet pipe, and a slag discharge pipe with a valve is installed at the bottom of the overflow pool, and a downwardly inclined guide plate is installed below the water inlet pipe of the temperature regulating pool and in the upper part of the overflow chamber, and the width of the guide plate is half of the width of the overflow chamber.

[0008] The heat utilization component is installed on the heat exchange pool, and the heat utilization component includes an air pump, a heat exchange tube group and a stirring group. The air pump is arranged outside the pool body of the heat exchange pool. The number of the heat exchange tube groups is determined according to the size of the pool body. The heat exchange tube group is composed of 2-4 turbine-shaped heat exchange coils arranged equidistantly from top to bottom, and each adjacent heat exchange coil is connected to each other so that each heat exchange coil is connected into a whole. The air inlet end of each group of heat exchange tube groups extends outside the pool body of the heat exchange pool and is connected to the air outlet of the air pump through a main pipe. The air outlet end also extends outside the pool body and is collected and connected through a collecting pipe. An insulation layer is arranged on the pipe body of the collecting pipe, and its exhaust end extends to other workshops to dry or preheat the hot air in the pipe.

[0009] The stirring group includes a stirring shaft, stirring blades and a stirring motor. The stirring shaft is located in the inner lower part of the heat exchange pool, and its two ends respectively pass through the outside of the heat exchange pool body, and the junction of the stirring shaft and the heat exchange pool is connected through a bearing, and the junction is sealed and waterproofed. The number of the stirring blades is 2-4, which are equidistantly installed on the shaft body of the stirring shaft, and the distance between the stirring blades and the bottom of the pool is 2-5cm. The stirring motor is arranged outside the pool body of the heat exchange pool, and its transmission end is connected to the rotating end of the stirring shaft, and is connected to the controller through a wire.

[0010] The water temperature regulating component is arranged on the temperature regulating pool body, and the water temperature regulating component includes a temperature regulating tube group and a refrigeration air conditioner. The temperature regulating tube group is a rectangular three-dimensional tube group formed by a plurality of fin tubes arranged equidistantly and connected. The temperature regulating tube group is arranged in the temperature regulating pool and connected to the bottom of the pool through a mounting seat, and the distance between its bottom surface and the bottom of the pool is 20-40cm. The air inlet and exhaust port of the temperature regulating tube group both extend outside the pool body. The refrigeration air conditioner is arranged on one side of the temperature regulating pool, and the exhaust pipe of its exhaust fan is connected to the air inlet of the temperature regulating tube group, and the refrigeration air conditioner is connected to the controller through a wire.

[0011] As an optimization solution for this case, a flue gas demisting and compression mechanism is provided on one side of the heat exchange pool.

[0012] Furthermore, the flue gas demisting and compression mechanism includes a demisting mechanism and a compression mechanism. The demisting mechanism is composed of a demisting tank and a demister. The middle part of the tank body of the demisting tank is a cylindrical structure, and the upper and lower parts are conical structures. The demisting tank is arranged above the flue gas duct of the heat exchange pool and is connected thereto. The demister is installed in the middle part of the demisting pipe. The compression mechanism is composed of an expander and a cooler connected by a pipeline. The feed end of the compression mechanism is connected to the exhaust pipe of the demisting tank, and the discharge end is connected to the top of the temperature regulating pool.

[0013] As an optimization solution for this case, in order to reduce the solidification of the residual fragments from entering the temperature control tank and impacting the fins of the temperature control tube group to cause damage, thereby affecting the temperature control effect, the heat exchange tank and the temperature control tank are connected via a filter tank, the water inlet end of the filter tank is connected to the water outlet pipe of the heat exchange tank, and the water outlet end is connected to the water outlet pipe of the temperature control tank, the end face between the water outlet end of the filter tank and the bottom of the tank is inclined, and a filter net is installed on the inclined surface.

[0014] Beneficial effects: The utility model combines the use of a heat exchange pool, a temperature regulating pool, a water temperature regulating component, a heat utilization component and a controller. Under the condition of meeting environmental protection requirements, it can recover the heat in the wastewater discharged from yellow phosphorus production and transport it to other workshops for drying or preheating, effectively reducing energy waste and quickly lowering the temperature of the wastewater for subsequent treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the heat exchange pool.

[0017] Figure 3 for Figure 1 Schematic diagram of the structure of the medium temperature control pool.

[0018] Figure 4 This is a schematic diagram of the structure of the utility model in Example 2.

[0019] Figure 5 for Figure 4 Schematic diagram of the structure of the filter tank.

[0020] In the figure: 1. heat exchange tank; 2. temperature control tank; 3. controller; 4. liquid level sensor; 5. temperature sensor; 6. overflow chamber; 7. guide plate; 8. air pump; 9. heat exchange tube group; 10. stirring group; 11. temperature control tube group; 12. refrigeration and air conditioning; 13. defogger mechanism; 14. compression mechanism; 15. filter tank; 16. filter net. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] The same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. The drawings are all in a very simplified form and use inaccurate ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. Example 1

[0023] like Figure 1-3 As shown, this embodiment discloses a water temperature regulating and heat utilization device for a phosphorus-containing wastewater sedimentation tank in yellow phosphorus production, which is used to cool the wastewater discharged from yellow phosphorus production, and specifically includes a heat exchange tank 1, a temperature regulating tank 2, a water temperature regulating component, a heat utilization component and a controller 3.

[0024] from Figure 1 It can be seen that the controller 3 is arranged at a position convenient for observation and operation, a sealing cover is installed on the top surface of the heat exchange pool 1, a flue gas duct is installed on the sealing cover, a slag discharge pipe with a valve is installed on the bottom of the pool body, a water inlet pipe is installed on the upper part, a water outlet pipe is installed on the lower part opposite to it, and a solenoid valve is installed on the water outlet pipe, and the solenoid valve is connected to the controller 3 through a wire, see Figure 2 A liquid level sensor 4 is installed on the upper side wall of the pool body, and a temperature sensor 5 is installed on the middle side wall. The two sensors are electrically connected to the controller 3 for signal transmission.

[0025] See also Figure 1 The temperature regulating pool 2 is arranged on one side of the heat exchange pool 1, and the bottom level of the temperature regulating pool 2 is lower than the bottom level of the heat exchange pool 1. The water inlet pipe of the temperature regulating pool 2 is connected with the water outlet pipe of the heat exchange pool 1, and the lower part opposite to it is equipped with a water outlet pipe, and the bottom is equipped with a slag discharge pipe with a bag valve, and the pool body is also equipped with a liquid level sensor 4 and a temperature sensor 5. Figure 3It can be seen that an overflow chamber 6 is provided in the pool body below the water inlet pipe side of the temperature regulating pool 2, and the overflow chamber 6 is an independent chamber formed by three partitions assembled and matched with the inner wall of the temperature regulating pool 2, and the height of the partition is lower than the height of the water inlet pipe, and a slag discharge pipe with a valve is installed at the bottom of the overflow pool, and a guide plate 7 is installed at a downward tilt below the water inlet pipe of the temperature regulating pool 2 and in the upper part of the overflow chamber 6, and the width of the guide plate 7 is half of the width of the overflow chamber 6.

[0026] See, 1 and Figure 2 The heat utilization component is installed on the heat exchange pool 1, and the heat utilization component includes an air pump 8, a heat exchange tube group 9 and a stirring group 10. The air pump 8 is arranged outside the pool body of the heat exchange pool 1. The number of the heat exchange tube group 9 is determined according to the size of the pool body. Figure 2 It can be seen that the heat exchange tube group 9 is composed of 2-4 turbine-shaped heat exchange coils arranged equidistantly from top to bottom, and each adjacent heat exchange coil is connected to form a whole. The air inlet end of each heat exchange tube group 9 extends to the outside of the heat exchange pool 1, and is connected to the air outlet of the air pump 8 through the main pipe. The air outlet end also extends to the outside of the pool and is connected through a collecting pipe. The collecting pipe is provided with an insulation layer, and its exhaust end extends to other workshops to dry or preheat the hot air in the pipe.

[0027] See also Figure 2 The stirring group 10 includes a stirring shaft, stirring blades and a stirring motor. The stirring shaft is located in the inner lower part of the heat exchange pool 1, and its two ends respectively pass through the outside of the pool body of the heat exchange pool 1, and the junction of the stirring shaft and the heat exchange pool 1 is connected through a bearing, and the junction is sealed and waterproofed. The number of the stirring blades is 2-4, which are equidistantly installed on the shaft body of the stirring shaft, and the distance between the stirring blades and the bottom of the pool is 2-5cm. The stirring motor is arranged outside the pool body of the heat exchange pool 1, and its transmission end is connected to the rotating end of the stirring shaft, and is connected to the controller 3 through a wire.

[0028] from Figure 1 and Figure 3 It can be seen that the water temperature regulating component is arranged on the temperature regulating pool 2, and the water temperature regulating component includes a temperature regulating pipe group 11 and a refrigeration air conditioner 12. For the specific structure, see Figure 3 The temperature regulating tube group 11 is a rectangular three-dimensional tube group formed by a plurality of fin tubes arranged and connected at equal distances. The temperature regulating tube group 11 is arranged in the temperature regulating pool 2 and is connected to the pool bottom through a mounting seat, and the distance between its bottom surface and the pool bottom is 20-40 cm. The air inlet and exhaust port of the temperature regulating tube group 11 both extend outside the pool body. The refrigeration air conditioner 12 is arranged on one side of the temperature regulating pool 2, and the exhaust pipe of its exhaust fan is connected to the air inlet of the temperature regulating tube group 11, and the refrigeration air conditioner 12 is connected to the controller 3 through a wire. Example 2

[0029] See also Figure 2 , Figure 4 and Figure 5 A flue gas demisting and compression mechanism 14 is provided on one side of the heat exchange pool 1.

[0030] from Figure 4 It can be seen that the flue gas demisting compression mechanism 14 includes a demisting mechanism 13 and a compression mechanism 14. The demisting mechanism 13 is composed of a demisting tank and a demister. The middle part of the tank body of the demisting tank is a cylindrical structure, and the upper and lower parts are conical structures. The demisting tank is arranged above the flue gas duct of the heat exchange pool 1 and is connected thereto. The demister is installed in the middle of the demisting pipe. The compression mechanism 14 is composed of an expander and a cooler connected by a pipeline. The feed end of the compression mechanism 14 is connected to the exhaust pipe of the demisting tank, and the discharge end is connected to the top of the temperature regulating pool 2.

[0031] See also Figure 4 and Figure 5 In order to reduce the solidification of the residue fragments from entering the temperature regulating pool 2 and impacting the fins of the temperature regulating pipe group 11 to cause damage and affect the temperature regulating effect, the heat exchange pool 1 and the temperature regulating pool 2 are connected through a filter pool 15, and the water inlet end of the filter pool 15 is connected to the outlet pipe of the heat exchange pool 1, and the water outlet end is connected to the outlet pipe of the temperature regulating pool 2. Figure 5 It can be seen that the end surface between the water outlet end of the filter pool 15 and the bottom of the pool is inclined, and a filter screen 16 is installed on the inclined surface.

[0032] During use, the wastewater discharged from the yellow phosphorus production is collected and first enters the heat exchange pool 1. When the preset liquid level is reached, the liquid level sensor 4 transmits the signal to the controller 3 and then closes the valve to stop water intake. At this time, the air pump 8 starts to work, and the air pump 8 blows the gas into the heat exchange tube of the heat exchange tube group 9 for spiral transportation. The gas absorbs heat in the water in contact with the heat exchange tube during the movement to increase its own temperature, so that it is converted into hot gas and transported to other workshops for secondary utilization. When the air absorbs the heat in the wastewater, the stirring group 10 is turned on to make the temperature of the wastewater in the heat exchange pool 1 average, reducing the situation where the wastewater temperature is low at a distance from the heat exchange tube group 9 and the temperature is high at a distance. The temperature sensor 5 monitors the water temperature in the pool in real time, but when the water temperature reaches the preset value, it is discharged into the temperature-controlled pool. During this period, the water mist and smoke in the pool are sucked out of the pool, first defogged by the defogger 13, and then compressed and condensed in the compressor mechanism. The low-temperature condensed water droplets enter the temperature-controlled pool 2 to cooperate with the water level regulating component to cool the wastewater.

[0033] After the wastewater is discharged from the heat exchange pool 1, it first enters the filter pool 15. The inclined surface and the filter screen 16 in the filter pool 15 cooperate to intercept the solidified substances in the wastewater and filter it in the filter pool 15. The wastewater reaches the inner chamber of the temperature regulating pool 2, enters the overflow chamber 6 through the guide plate 7 for initial sedimentation, and then overflows into the main body of the temperature regulating pool 2. At this time, the controller 3 turns on the refrigeration air conditioner 12 to transport the cold air to the temperature regulating pipe group 11, and then the fins on the pipe body dissipate the cold to cool the wastewater until it reaches a suitable temperature.

[0034] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A water temperature regulating and heat utilization device for a phosphorus-containing wastewater sedimentation tank in yellow phosphorus production, comprising a heat exchange tank (1), a temperature regulating tank (2), a water temperature regulating component, a heat utilization component and a controller (3), characterized in that: The controller (3) is arranged at a position convenient for observation and operation. A sealing cover is installed on the top surface of the heat exchange pool (1), and a flue gas duct is installed on the sealing cover. A slag discharge pipe with a valve is installed on the bottom of the pool body. A water inlet pipe is installed on the upper part, and a water outlet pipe is installed on the lower part opposite to the water inlet pipe. A solenoid valve is installed on the water outlet pipe, and the solenoid valve is connected to the controller (3) via a wire. A liquid level sensor (4) is installed on the upper side wall of the pool body, and a temperature sensor (5) is installed on the middle side wall. The two sensors are electrically connected to the controller (3) for signal transmission. The temperature regulating pool (2) is arranged on one side of the heat exchange pool (1), the bottom surface of the temperature regulating pool (2) is lower than the bottom surface of the heat exchange pool (1), the water inlet pipe of the temperature regulating pool (2) is connected to the water outlet pipe of the heat exchange pool (1), and a water outlet pipe is installed at the lower part opposite to the water inlet pipe, and a slag discharge pipe with a bag valve is installed at the bottom, and a liquid level sensor (4) and a temperature sensor (5) are also installed in the pool body, and an overflow chamber (6) is provided in the pool body below the water inlet pipe side of the temperature regulating pool (2), and the overflow chamber (6) is an independent chamber formed by assembling three partitions and cooperating with the inner wall of the temperature regulating pool (2), and the height of the partition is lower than the height of the water inlet pipe, and a slag discharge pipe with a valve is installed at the bottom of the overflow pool, and a guide plate (7) arranged downwardly inclined is installed below the water inlet pipe of the temperature regulating pool (2) and in the upper part of the overflow chamber (6), and the width of the guide plate (7) is half of the width of the overflow chamber (6); The heat utilization component is installed on the heat exchange pool (1), and the heat utilization component includes an air pump (8), a heat exchange tube group (9) and a stirring group (10). The air pump (8) is arranged outside the pool body of the heat exchange pool (1). The number of the heat exchange tube groups (9) is determined according to the size of the pool body. The heat exchange tube group (9) is composed of 2-4 turbine-shaped heat exchange coils arranged equidistantly from top to bottom, and each adjacent heat exchange coil is connected so that each heat exchange coil is connected into a whole. The air inlet end of each heat exchange tube group (9) extends to the outside of the pool body of the heat exchange pool (1) and is connected to the air outlet of the air pump (8) through a main pipe. The air outlet end also extends to the outside of the pool body and is connected through a collecting pipe. The pipe body of the collecting pipe is provided with a thermal insulation layer, and the exhaust end thereof extends to other workshops to dry or preheat the hot air in the pipe. The stirring group (10) comprises a stirring shaft, stirring blades and a stirring motor. The stirring shaft is located at the inner lower part of the heat exchange pool (1), and its two ends respectively pass through the outside of the heat exchange pool (1). The junction between the stirring shaft and the heat exchange pool (1) is connected via a bearing, and the junction is sealed and waterproofed. The number of the stirring blades is 2-4, which are equidistantly installed on the shaft of the stirring shaft, and the distance between the stirring blades and the bottom of the pool is 2-5 cm. The stirring motor is arranged outside the pool of the heat exchange pool (1), and its transmission end is connected to the rotating end of the stirring shaft, and is connected to the controller (3) via a wire. The water temperature regulating component is arranged on the body of the temperature regulating pool (2), and comprises a temperature regulating pipe group (11) and a refrigerating air conditioner (12). The temperature regulating pipe group (11) is a rectangular three-dimensional pipe group formed by a plurality of finned tubes arranged equidistantly and connected. The temperature regulating pipe group (11) is arranged in the temperature regulating pool (2) and connected to the pool bottom through a mounting seat, and the distance between its bottom surface and the pool bottom is 20-40 cm. The air inlet and the air outlet of the temperature regulating pipe group (11) both extend outside the pool body. The refrigerating air conditioner (12) is arranged on one side of the temperature regulating pool (2), and the exhaust pipe of its exhaust fan is connected to the air inlet of the temperature regulating pipe group (11), and the refrigerating air conditioner (12) is connected to the controller (3) through a wire.

2. The water temperature regulating and heat utilizing device for the phosphorus-containing wastewater sedimentation tank in yellow phosphorus production according to claim 1, characterized in that: A flue gas demisting and compression mechanism (14) is provided on one side of the heat exchange pool (1).

3. The water temperature regulating and heat utilizing device for the phosphorus-containing wastewater sedimentation tank in yellow phosphorus production according to claim 2, characterized in that: The flue gas demisting compression mechanism (14) comprises a demisting mechanism (13) and a compression mechanism (14). The demisting mechanism (13) consists of a demisting tank and a demister. The middle part of the tank body of the demisting tank is a cylindrical structure, and the upper and lower parts are conical structures. The demisting tank is arranged above the flue gas passage of the heat exchange tank (1) and is connected thereto. The demister is installed in the middle part of the demisting pipe. The compression mechanism (14) consists of an expander and a cooler connected by a pipeline. The feed end of the compression mechanism (14) is connected to the exhaust pipe of the demisting tank, and the discharge end is connected to the top of the temperature regulating tank (2).

4. The water temperature regulating and heat utilizing device for the phosphorus-containing wastewater sedimentation tank in yellow phosphorus production according to claim 1 or 2, characterized in that: In order to reduce the solidification of the residue fragments from entering the temperature regulating pool (2) and impacting the fins of the temperature regulating pipe group (11) to cause damage and affect the temperature regulating effect, the heat exchange pool (1) and the temperature regulating pool (2) are connected via a filter pool (15); the water inlet end of the filter pool (15) is connected to the water outlet pipe of the heat exchange pool (1), and the water outlet end is connected to the water outlet pipe of the temperature regulating pool (2); the end surface between the water outlet end of the filter pool (15) and its pool bottom is inclined, and a filter screen (16) is installed on the inclined surface.

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