A pre-dewatering system for gypsum powder

Abstract

The application discloses a kind of predehydration systems of gypsum powder, including box, driver, air injection component, the top of one end of box is provided with feed inlet, the bottom of the other end of box is provided with discharge port, the inside of box is formed from feed inlet towards the drying channel of extension of discharge port, box includes movable floor, driver is used to drive floor swing or shake, the direction of movement of floor is inclined towards discharge port, air injection component is arranged in one end of box close to discharge port, air injection component connects the output end of air blower, air injection component is used to the hot air flowing along drying channel is injected to feed inlet.Gypsum powder is fully contacted with hot air in the process of repeatedly lifting and then falling and gradually passes through drying channel, the flow rate of hot air inside drying channel is controlled to be able to hinder but not completely prevent the speed of gypsum powder moving towards discharge port, so that gypsum powder is efficiently separated from free water.

Description

Technical Field

[0001] This invention relates to the field of gypsum powder feeding equipment, and more specifically to a gypsum powder pre-dehydration system. Background Technology

[0002] The free water content in the raw gypsum of the gypsum board production line directly affects the energy consumption of the powder-making section. Generally, the free water content is 8%-18%. Based on current calcination processes, it is estimated that for every 1% increase in free water, the natural gas consumption for producing one ton of calcined gypsum powder increases by 1 m³. 3 This severely restricts the implementation of energy conservation and cost reduction efforts. Furthermore, the exhaust temperature of the calcination system is 110℃-120℃, and directly releasing this high-temperature gas into the air is a waste of energy. Summary of the Invention

[0003] The purpose of this invention is to provide a pre-dehydration system for gypsum powder to solve the problems of excessive free water content in raw gypsum, excessive heat energy consumption in frying calcined gypsum powder, and excessive heat energy waste due to excessively high tail-end temperature of the calcination system.

[0004] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0005] A pre-dehydration system for gypsum powder includes: an induced draft fan, a housing, a driver, and an air jetting component; a feed inlet is provided at the top of one end of the housing, and a discharge outlet is provided at the bottom of the other end of the housing; a drying channel extending from the feed inlet to the discharge outlet is formed inside the housing; the housing includes a movable base plate; the actuator of the driver is kinetically connected to the base plate; the driver is used to drive the base plate to swing or vibrate; the movement direction of the base plate is inclined towards the discharge outlet, so that the gypsum powder falling onto the base plate through the feed inlet is lifted up and falls along the drying channel towards the discharge outlet; the air jetting component is located at the end of the housing near the discharge outlet; the air jetting component is connected to the output end of the induced draft fan; the air jetting component is used to spray hot air flowing along the drying channel into the feed inlet, so that the lifted gypsum powder comes into contact with the hot air.

[0006] Preferably, the cross-section of the box is rectangular.

[0007] Preferably, the jetting component includes a spray plate and nozzles. The spray plate is rectangular and is disposed at one end of the drying channel near the discharge port. The spray plate is perpendicular to the length direction of the drying channel. The number of nozzles is several, and the nozzles cover the side of the spray plate facing the feed port. The nozzles are connected to the induced draft fan.

[0008] Preferably, the bottom plate is connected to the side wall of the housing by a flexible sealing element.

[0009] Preferably, the pre-dehydration system further includes a velocity measuring ball that can move synchronously with the gypsum powder in the drying channel, and a screen is installed at the discharge port with sieve holes that allow the gypsum powder to pass through but prevent the velocity measuring ball from passing through.

[0010] Preferably, the velocity measuring ball is made of a lightweight porous material.

[0011] Preferably, the discharge port is connected to a discharge pipe, which is vertically arranged. A ball storage trough protruding outward to one side is formed in the middle of the discharge pipe. The screen is placed horizontally in the middle of the discharge pipe. One side of the screen rests against the bottom of the ball storage trough, and the other side of the screen rests against the inner wall of the discharge pipe and is higher than the bottom of the ball storage trough. A ball collection port is provided at the top of the ball storage trough.

[0012] Preferably, the feed inlet is connected to a vertically arranged feed pipe and an exhaust pipe, the feed pipe is inserted inside the exhaust pipe, and a spiral blade is provided between the exhaust pipe and the feed pipe.

[0013] Preferably, a ball-in-the-hole tube is connected to the middle end of the feed pipe, with one end of the ball-in-the-hole tube away from the feed pipe being higher than the other end. A valve core is provided at the middle end of the ball-in-the-hole tube. The valve core is a hemispherical shell, with its outer wall fitting the inner wall of the ball-in-the-hole tube. The shape of the inner wall of the valve core matches the shape of the outer wall of the speed-measuring ball. The valve core can rotate around a radial line of the ball-in-the-hole tube, and the axis of rotation of the valve core passes through the open end face of the valve core, so that when the valve core rotates to a certain angle, the speed-measuring ball can enter the opening of the valve core through the ball-in-the-hole tube. A motor is provided on the outside of the ball-in-the-hole tube, and the actuator of the motor is connected to the valve core for transmission. The motor is used to drive the valve core to rotate, so that one speed-measuring ball is driven into the feed pipe every time the valve core rotates one revolution.

[0014] Preferably, it further includes: a heat exchanger, the heat exchanger including an exhaust gas passage and an air passage for exchanging heat energy, the exhaust gas passage being connected to the tail gas of the calcination system, and the air passage being connected to the atmosphere and the induced draft fan, so that the air is heated into hot air after passing through the heat exchanger.

[0015] Compared with the prior art, this application has the following advantages:

[0016] A pre-dehydration system for gypsum powder is provided, in which the gypsum powder comes into full contact with hot air during repeated lifting and falling motion and gradually passes through a drying channel. The flow rate of the hot air inside the drying channel is controlled to a speed that can hinder but not completely prevent the gypsum powder from moving toward the discharge port, so that the gypsum powder is efficiently dehydrated from free water. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is a system structure diagram of Embodiment 1 of the present invention;

[0019] Figure 2 This is a partial structural diagram of the area near the discharge port in Embodiment 2 of the present invention;

[0020] Figure 3 This is a partial structural diagram of the area near the feed inlet in Embodiment 3 of the present invention;

[0021] Figure 4 for Figure 3 A magnified view of a portion at point A;

[0022] The labels in the diagram represent the following:

[0023] 1-Heat exchanger; 11-Exhaust gas passage; 12-Air passage; 2-Exhaust fan; 3-Box body; 31-Inlet; 311-Inlet pipe; 312-Exhaust pipe; 313-Spiral blade; 314-Spiral passage; 32-Outlet; 33-Drying passage; 34-Bottom plate; 35-Side wall; 36-Flexible seal; 4-Driver; 5-Air jet component; 51-Spray plate; 52-Nozzle; 6-Speed ​​measuring ball; 7-Outlet pipe; 71-Screen; 72-Ball accumulator; 73-Ball collection port; 8-Inlet pipe; 81-Valve core; 82-Motor. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The free water content in the raw gypsum of the gypsum board production line directly affects the energy consumption of the powder-making section. Generally, the free water content is 8%-18%. Based on current calcination processes, it is estimated that for every 1% increase in free water, the natural gas consumption for producing one ton of calcined gypsum powder increases by 1 m³. 3 This severely restricts the implementation of energy conservation and cost reduction efforts. Furthermore, the exhaust temperature of the calcination system is 110℃-120℃, and directly releasing this high-temperature gas into the air is a waste of energy.

[0026] To address the issues of excessive free water content in raw gypsum, excessive heat energy consumption during calcination of gypsum powder, and excessively high exhaust temperature of the calcination system leading to wasted heat energy, a pre-dehydration system for gypsum powder is provided below.

[0027] Example 1, please refer to Figure 1 .

[0028] The pre-dehydration system includes: heat exchanger 1, induced draft fan 2, housing 3, drive unit 4, and jet assembly 5;

[0029] The heat exchanger 1 includes an exhaust gas passage 11 and an air passage 12 for exchanging heat energy. The exhaust gas passage 11 is connected to the exhaust gas of the calcination system, and the air passage 12 is connected to the atmosphere and the induced draft fan 2, so that the air is heated into hot air after passing through the heat exchanger 1.

[0030] The top of one end of the box 3 is provided with a feed inlet 31, and the bottom of the other end of the box 3 is provided with a discharge outlet 32. The interior of the box 3 forms a drying channel 33 extending from the feed inlet 31 toward the discharge outlet 32. The box 3 includes a movable bottom plate 34. The actuator of the driver 4 is connected to the bottom plate 34. The driver 4 is used to drive the bottom plate 34 to swing or vibrate. The movement direction of the bottom plate 34 is inclined toward the discharge outlet 32, so that the gypsum powder falling on the bottom plate 34 through the feed inlet 31 is lifted up and falls along the drying channel 33 toward the discharge outlet 32.

[0031] The jetting component 5 is located at one end of the housing 3 near the discharge port 32. The jetting component 5 is connected to the output end of the blower 2. The jetting component 5 is used to spray hot air flowing along the drying channel 33 into the feed inlet 31 so that the gypsum powder that is raised comes into contact with the hot air.

[0032] Both the box body 3 and the bottom plate 34 can be horizontal or inclined. When the box body 3 is inclined, the height of the end of the drying channel 33 near the feed inlet 31 is greater than the height of the end of the drying channel 33 near the discharge outlet 32.

[0033] The flow rate of hot air inside the drying channel 33 is designed to impede but not completely prevent the gypsum powder from moving toward the discharge port 32. The gypsum powder is repeatedly lifted inside the box 3 to fully contact the hot air, thereby allowing the gypsum powder to efficiently remove free water.

[0034] Preferably, the cross-section of the box 3 is rectangular, so that plaster powder raised at any position on the bottom plate 34 can rise to the same height and fall back to the bottom plate 34 after the same falling distance, so that the plaster powder can be dried evenly.

[0035] Optionally, the jetting component 5 includes a spray plate 51 and nozzles 52. The spray plate 51 is rectangular and is disposed at one end of the drying channel 33 near the discharge port 32. The spray plate 51 is perpendicular to the length direction of the drying channel 33. There are several nozzles 52, which cover the side of the spray plate 51 facing the feed port 31. The nozzles 52 are connected to the air channel 12. The jetting component 5 forms an airflow that covers the drying channel 33 and flows uniformly through several nozzles 52.

[0036] In this embodiment, the bottom plate 34 is hinged to the box 3 at one end near the discharge port 32 so that the other end of the bottom plate 34 can swing. The driver 4 is a reciprocating driver, such as a cylinder, or a crank-connecting rod mechanism driven by a motor 82. The reciprocating driver is fixedly mounted on the frame. The actuator of the reciprocating driver is fixedly connected to the bottom plate 34. The bottom plate 34 performs reciprocating swing, causing the gypsum powder to be continuously thrown up.

[0037] Both ends of the base plate 34 can also be fixedly installed on the actuator of the vibration motor 82. The vibration motor 82 is fixedly installed on the frame, which can also achieve the purpose of continuously raising the gypsum powder.

[0038] Preferably, the base plate 34 is connected to the side wall 35 of the housing 3 by a flexible seal 36. The flexible seal 36 can be made of an airtight fabric to prevent plaster powder from falling into the gap between the base plate 34 and the side wall 35 of the housing 3.

[0039] Furthermore, since the amount of gypsum powder inside the drying channel 33 affects the resistance of hot air to the gypsum powder, when the amount of gypsum powder is large, the transit time of the gypsum powder inside the drying channel 33 will be correspondingly shortened, causing the gypsum powder to leave the drying channel 33 through the discharge port 32 before it is dried to the expected degree. Therefore, when the movement speed of the gypsum powder inside the drying channel 33 increases, the flow rate of the hot air ejected from the nozzle 52 should also increase accordingly, so that the transit time of the gypsum powder inside the drying channel 33 remains basically constant. However, it is difficult to measure the movement speed of the gypsum powder inside the box 3.

[0040] To address the aforementioned technical problems, a preferred embodiment 2 is provided below. Please refer to... Figure 2 .

[0041] The pre-dehydration system also includes a speed measuring ball 6, which can move synchronously with the gypsum powder in the drying channel 33. A screen 71 is installed at the discharge port 32, which has sieve holes that allow gypsum powder to pass through but prevent the speed measuring ball 6 from passing through.

[0042] The staff puts the speed measuring ball 6 into the feed inlet 31 and starts timing. The timing ends when the speed measuring ball 6 falls onto the screen 71. The difference between the two times is the time required for the gypsum powder to pass through the drying channel 33.

[0043] The speed measuring ball 6 is made of a lightweight porous material so that its density is close to that of the gypsum powder being lifted, thus enabling the speed measuring ball 6 to move synchronously with the gypsum powder.

[0044] The method for manufacturing the velocity measuring ball 6 is as follows: multiple solid or hollow velocity measuring balls 6 are manufactured using different lightweight porous materials, the different velocity measuring balls 6 are mixed with gypsum powder, and then air separation is performed. The velocity measuring balls 6 that cannot be air separated meet the requirements of Example 2.

[0045] To facilitate the recovery of the speed measuring ball 6 from the screen 71, the discharge port 32 is connected to the discharge pipe 7, which is vertically arranged. A ball storage trough 72 protruding outward to one side is formed in the middle of the discharge pipe 7. A ball collection port 73 is provided at the top of the ball storage trough 72. The screen 71 is placed horizontally in the middle of the discharge pipe 7. One side of the screen 71 rests against the bottom of the ball storage trough 72, and the other side of the screen 71 rests against the inner wall of the discharge pipe 7 and is higher than the bottom of the ball storage trough 72.

[0046] After the speed measuring ball 6 falls onto the screen 71, it rolls along the screen 71 into the ball storage tank 72. The staff takes out the speed measuring ball 6 through the ball retrieval port 73, cleans it, and reuses it.

[0047] On the other hand, the feed inlet 31 is usually directly connected to the disc feeder (not shown in the figure), so it is difficult to insert the speed measuring ball 6 from the feed inlet 31. Furthermore, there is a lack of gap between the disc feeder and the feed inlet 31 for exhausting hot air. In order to solve the above technical problems, a preferred technical solution is provided below.

[0048] Example 3, please refer to Figure 3 , 4 .

[0049] The feed inlet 31 is connected to a vertically arranged feed pipe 311 and an exhaust pipe 312. The feed pipe 311 is inserted inside the exhaust pipe 312, and a spiral blade 313 is provided between the exhaust pipe 312 and the feed pipe 311.

[0050] Since the feed pipe 311 is directly connected to the disc feeder, the feed pipe 311 can be considered to be in a normally closed state. Hot air can only be discharged through the exhaust pipe 312. The exhaust pipe 312 is divided into a spiral channel 314 by the spiral blades 313. During the flow of hot air and gypsum powder through the spiral channel 314, the hot air reaches the outlet of the spiral channel 314, and the gypsum powder loses power due to friction with the inner wall of the exhaust pipe 312, and finally returns to the drying channel 33.

[0051] The middle end of the feed pipe 311 is connected to the ball pipe 8. The end of the ball pipe 8 away from the feed pipe 311 is higher than the other end of itself. The middle end of the ball pipe 8 is provided with a valve core 81. The valve core 81 is a hemispherical shell. The outer wall of the valve core 81 is in clearance fit with the inner wall of the ball pipe 8. The shape of the inner wall of the valve core 81 matches the shape of the outer wall of the speed measuring ball 6. The valve core 81 can rotate around a radial line of the ball pipe 8. The rotation axis of the valve core 81 passes through the open end face of the valve core 81, so that when the valve core 81 rotates to an angle, the speed measuring ball 6 can enter the opening of the valve core 81 through the ball pipe 8.

[0052] A motor 82 is installed on the outside of the inlet tube 8. The actuator of the motor 82 is connected to the valve core 81 for transmission. The motor 82 is used to drive the valve core 81 to rotate so that when the valve core 81 rotates once, it drives a speed measuring ball 6 into the feed tube 311.

[0053] The ball inlet tube 8 is normally closed by the valve core 81, so hot air will not enter the interior of the ball inlet tube 8. The motor 82 is connected to the human-machine interface device via the controller. The human-machine interface device can be set near the ball inlet 73, so that the operator can operate the speed measuring ball 6 to enter the interior of the drying channel 33 from the side of the ball inlet 73. The ball inlet 73 can also be equipped with a photoelectric switch or a visual detection device to detect the speed measuring ball 6, thereby replacing manual timing.

[0054] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A pre-dehydration system for gypsum powder, characterized in that, include: Draft fan (2), housing (3), drive unit (4), jet component (5); The top of one end of the box (3) is provided with a feed inlet (31), and the bottom of the other end of the box (3) is provided with a discharge outlet (32). The interior of the box (3) forms a drying channel (33) extending from the feed inlet (31) toward the discharge outlet (32). The box (3) includes a movable bottom plate (34). The actuator of the driver (4) is connected to the bottom plate (34). The driver (4) is used to drive the bottom plate (34) to swing or vibrate. The movement direction of the bottom plate (34) is inclined toward the discharge outlet (32) so that the gypsum powder falling on the bottom plate (34) through the feed inlet (31) is lifted up and falls along the drying channel (33) toward the discharge outlet (32). The jetting component (5) is located at one end of the housing (3) near the outlet (32). The jetting component (5) is connected to the output end of the blower (2). The jetting component (5) is used to spray hot air flowing along the drying channel (33) into the feed inlet (31) so that the gypsum powder is in contact with the hot air. The bottom plate (34) is connected to the side wall (35) of the box body (3) by a flexible sealing element (36); The pre-dehydration system also includes a speed measuring ball (6), which can move synchronously with the gypsum powder in the drying channel (33). The discharge port (32) is equipped with a screen (71), which has sieve holes that allow the gypsum powder to pass through but the speed measuring ball (6) cannot pass through. The feed inlet (31) is connected to a vertically arranged feed pipe (311) and an exhaust pipe (312). The feed pipe (311) is inserted inside the exhaust pipe (312), and a spiral blade (313) is provided between the exhaust pipe (312) and the feed pipe (311). The feed pipe (311) is connected to a ball tube (8) at its middle end. The end of the ball tube (8) away from the feed pipe (311) is higher than the other end of itself. A valve core (81) is provided at the middle end of the ball tube (8). The valve core (81) is a hemispherical shell. The outer wall of the valve core (81) is in clearance fit with the inner wall of the ball tube (8). The shape of the inner wall of the valve core (81) matches the shape of the outer wall of the speed measuring ball (6). The valve core (81) can rotate around a radial line of the ball tube (8). The rotation axis of the valve core (81) passes through the opening end face of the valve core (81) so that when the valve core (81) rotates to an angle, the speed measuring ball (6) can enter the opening of the valve core (81) through the ball tube (8). A motor (82) is provided on the outside of the ball tube (8). The actuator of the motor (82) is connected to the valve core (81) for transmission. The motor (82) is used to drive the valve core (81) to rotate so that the valve core (81) drives one of the speed measuring balls (6) into the feed tube (311) every time it rotates once.

2. The pre-dehydration system for gypsum powder according to claim 1, characterized in that, The cross-section of the box (3) is rectangular.

3. The pre-dehydration system for gypsum powder according to claim 2, characterized in that, The jetting component (5) includes a spray plate (51) and nozzles (52). The spray plate (51) is rectangular and is located at one end of the drying channel (33) near the outlet (32). The spray plate (51) is perpendicular to the length direction of the drying channel (33). There are several nozzles (52). The nozzles (52) cover the side of the spray plate (51) facing the inlet (31). The nozzles (52) are connected to the blower (2).

4. The pre-dehydration system for gypsum powder according to claim 1, characterized in that, The velocity measuring ball (6) is made of a lightweight porous material.

5. The pre-dehydration system for gypsum powder according to claim 1, characterized in that, The discharge port (32) is connected to the discharge pipe (7), which is vertically arranged. A ball storage trough (72) protruding outward to one side is formed at the middle end of the discharge pipe (7). The screen (71) is horizontally placed at the middle end of the discharge pipe (7). One side of the screen (71) rests against the bottom of the ball storage trough (72), and the other side of the screen (71) rests against the inner wall of the discharge pipe (7) and is higher than the bottom of the ball storage trough (72). A ball collection port (73) is provided at the top of the ball storage trough (72).

6. The pre-dehydration system for gypsum powder according to claim 1, characterized in that, It also includes a heat exchanger (1), which includes an exhaust gas passage (11) and an air passage (12) for exchanging heat energy. The exhaust gas passage (11) is connected to the tail gas of the calcination system, and the air passage (12) is connected to the atmosphere and the induced draft fan (2) so that the air is heated into hot air by passing through the heat exchanger (1).

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