Device for drying plate by utilizing surplus steam of boiler

Abstract

The invention relates to the field of plate drying, and discloses a device for drying plates by utilizing surplus steam of a boiler, which comprises a drying chamber, a heat exchanger is arranged in the drying chamber, the heat exchanger is used for realizing heat exchange between air and the surplus steam of the boiler to enable the air to absorb heat to form hot air, and a placing frame is arranged in the drying chamber. The placing frame comprises two placing assemblies which are distributed up and down, each placing assembly comprises side plates, the two side plates are arranged in the width direction of the drying chamber, a plurality of transverse rods are arranged between the two side plates, the transverse rods are arranged in an array mode in the length direction of the drying chamber, and protruding rods are arranged on the opposite sides of the transverse rods of the two placing assemblies; a plurality of protruding rods are arranged in the extending direction of the transverse rod in an array mode, the area between every two adjacent protruding rods is a supporting area, the projection distance of the plates placed on the placing frame in the width direction of the drying chamber is equal to the distance between every two adjacent plates, and hot air intermittently flows in the drying chamber.

Description

Technical Field

[0001] The invention relates to the field of plate drying, and in particular to a device for drying plates by utilizing surplus steam from a boiler. Background Art

[0002] During the production and processing of wood boards, the boards need to be dried. In the prior art, the boards are generally placed in a drying room and then dried. For example:

[0003] The Chinese utility model patent with the authorization announcement number CN211964889U discloses a plate drying loading rack, which drives the movable frame to rotate so that the plates can be placed horizontally during loading and unloading, and the plates can be arranged vertically when drying in the drying chamber;

[0004] The Chinese utility model patent with the authorization announcement number CN221630185U discloses a board drying machine, in which the wood or the connected pallets are placed horizontally in the compartment by a forklift during operation, that is, the boards are arranged horizontally during drying;

[0005] It can be known from the above-mentioned existing patent literature technology that the boards are generally placed vertically or horizontally in the drying room for drying. This drying method has some shortcomings: 1. When the hot air flows from bottom to top, it will take away the moisture of the board to achieve the purpose of drying. Therefore, the higher the hot air is, the lower the temperature and the higher the humidity are. Therefore, when the boards are arranged horizontally, the boards on the bottom layer can be evenly dried by the hot air, but the temperature and humidity of the hot air on the boards on other layers are different. Therefore, the drying effect of the boards in the entire drying room is different, but the drying time of the same batch of boards in the same drying room is the same, so the drying effect is relatively poor; when the boards are arranged vertically, the same problem exists, that is, the drying effect of the bottom and top of the board is inconsistent and there is a difference; 2. The moisture content of the board after drying is different according to different uses. The moisture content of furniture boards is 8%-12%, and the moisture content of floor boards is 6%-10%. In the prior art, the moisture content is generally indirectly controlled by controlling the drying time. This method has poor accuracy and cannot accurately determine when the moisture content of the board reaches the set range.

[0006] Based on the above problems, the present invention proposes a device for drying plates using surplus steam from a boiler. Summary of the invention

[0007] In order to solve the problems mentioned in the above background, the present invention provides a device for drying plates using surplus steam from a boiler.

[0008] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0009] A device for drying plates using the surplus steam of a boiler, comprising a drying chamber, in which a heat exchanger is arranged. The heat exchanger is used to realize the heat exchange between air and the surplus steam of the boiler, so that the air absorbs heat to form hot air, and the hot air flows upward from bottom to top in the drying chamber;

[0010] A placing rack is arranged in the drying chamber. The placing rack comprises placing components. There are two placing components arranged along the vertical direction. The placing component comprises side plates. The extending direction of the side plates is parallel to the length direction of the drying chamber. There are two side plates arranged along the width direction of the drying chamber. A cross bar is arranged between the two side plates. The extending direction of the cross bar is parallel to the width direction of the drying chamber. A plurality of cross bars are arranged in an array along the length direction of the drying chamber. Convex bars are arranged on the opposite sides of the cross bars of the two placing components. A number of convex bars are arranged in an array along the extending direction of the cross bar. The area between two adjacent convex bars is a support area;

[0011] The projection distance of the plate placed on the placing rack in the width direction of the drying chamber is equal to the distance between two adjacent plates. The hot air flows intermittently in the drying chamber, so that the plate can be subjected to a balanced drying effect, and the moisture content of each part of the plate maintains an approximately consistent drying decreasing trend, and the drying quality is better.

[0012] As a further improvement and optimization of the present invention, the side plates of the placing component located below are fixedly arranged in the drying chamber, and the side plates of the placing component located above are slidably arranged in the drying chamber along the width direction of the drying chamber. An expansion rod is arranged on the outer surface of the drying chamber. The output end of the expansion rod extends into the drying chamber and is connected to the side plate of the placing component located above;

[0013] When drying the plate, the placing component located above is periodically driven to move by the expansion rod, so as to further enhance the drying uniformity and improve the drying quality.

[0014] As a further improvement and optimization of the present invention, a bottom cover is arranged at the lower opening of the drying chamber. An air inlet cover is arranged on the side surface of the bottom cover. The end of the air inlet cover is provided with a first fan through an intermittent component;

[0015] The intermittent component comprises a valve pipe arranged between the air inlet cover and the first fan, a valve core arranged in the valve pipe, a valve hole arranged on the valve core, and a motor for driving the valve core to rotate.

[0016] As a further improvement and optimization of the present invention, the bottom of the bottom cover is composed of two air guiding inclined plates. The distance between the two air guiding inclined plates decreases from bottom to top. There are two air inlet covers and they are respectively located on the opposite sides of the two air guiding inclined plates. There are two corresponding first fans;

[0017] It can make the hot air flow evenly upward in the drying chamber.

[0018] As a further improvement and optimization of the present invention, an inlet and outlet are provided on the side of the drying chamber, and a bin cover is arranged at the inlet and outlet, facilitating the placement of the board on the placement rack or the removal of the board from the placement rack.

[0019] As a further improvement and optimization of the present invention, a top cover is provided at the upper opening of the drying chamber, a condensing unit is arranged at the upper end of the top cover, and an exhaust pipe is arranged at the upper end of the condensing unit;

[0020] By collecting the water condensed by the condensing unit, the amount of moisture of the board taken away by drying is monitored in real time, indirectly achieving the purpose of monitoring the moisture content of the board in real time.

[0021] As a further improvement and optimization of the present invention, the condensing unit includes a condensing shell, the exhaust pipe is arranged at the upper opening end of the condensing shell, a partition is arranged inside the condensing shell, and the partition divides the inner cavity of the condensing shell into a non-communicating outer cavity and an inner cavity. A connection hole is provided at the bottom of the inner cavity, and the connection hole is connected to the upper opening of the top cover.

[0022] As a further improvement and optimization of the present invention, a drain hole is provided at the bottom of the inner cavity, a drain pipe is arranged at the drain hole, and an input pipe and an output pipe communicating with the outer cavity are arranged on the outer surface of the condensing shell;

[0023] When the board is dried, the water discharged from the drain pipe is collected and weighed.

[0024] As a further improvement and optimization of the present invention, fins are arranged on the inner surface of the partition, and a second fan is arranged in the inner cavity. The second fan is used to draw air to flow towards the fins, improving the condensation effect of the condensing unit.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] First, when the present solution dries the board:

[0027] The board to be dried is arranged obliquely, and the projection distance of the board placed on the placement rack in the width direction of the drying chamber is equal to the distance between two adjacent boards, and the hot air in the drying chamber flows intermittently upwards. Therefore: Figure 4Taking the perspective as an example, the hot air flows evenly from bottom to top in the drying chamber. Regarding the hot air between two adjacent plates as a stream of air, when the air stream flows upward, it is equally divided into several parts along the width direction of the drying chamber. Among two adjacent parts of the air stream, the plate directly above the left air stream is named the left contact area, and the plate directly above the right air stream is named the right contact area. The left air stream will come into contact with the left contact area of the plate first. At the same time of contact, the left air stream will be hindered by the plate and its flow rate will slow down, while the right air stream is not hindered. Compared with the left air stream, its flow rate is faster and it will come into contact with the right contact area of the plate earlier than the left air stream. That is to say, the hot air stream between two adjacent plates will evenly contact each part of the lower inclined surface of the plate, and the hot air that comes into contact with the plate first has not undergone the drying behavior before contact. That is to say, it is equivalent to the plate receiving a balanced drying effect, so that the moisture content of each part of the plate can be kept at the same decreasing trend as much as possible, so that the moisture content of each part of the dried plate is consistent;

[0028] Furthermore, the placement component located above is regularly driven by the telescopic rod to move, so that the inclination direction of the plate is to the left or to the right. In this way, both large surfaces of the plate can be in direct contact with the hot air. The large surface refers to the side with the largest area of the plate, which further improves the drying effect.

[0029] Second, in this solution, the condensation unit is used to condense and remove water from the hot air coming out of the drying chamber, and the amount of the condensed water is weighed. Also, since the initial moisture content of the plate is known, therefore, this solution can indirectly obtain the real-time moisture content of the plates in the drying chamber, and the moisture content during the drying of the plates can be controlled more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the present invention;

[0031] Figure 2 is a cross-sectional view of the present invention;

[0032] Figure 3 is a schematic diagram of the placement rack in Embodiment 1;

[0033] Figure 4 is a schematic diagram of the positions of two adjacent plates in Embodiment 2;

[0034] Figure 5 is a schematic diagram of the placement rack and the telescopic rod in Embodiment 3;

[0035] Figure 6 is a cross-sectional view of the condensation unit;

[0036] Figure 7 is a schematic structural diagram of the condensation unit.

[0037] The reference numerals in the drawings are as follows:

[0038] 100, drying chamber; 101, bin cover; 102, bottom cover; 1021, air guide inclined plate; 103, heat exchanger; 1031, steam inlet; 1032, water outlet; 1033, water tank; 1034, water outlet pipe; 104, top cover; 105, air inlet hood; 106, first fan; 107, condensation unit; 1071, condensation shell; 1072, partition board; 1073, connection hole; 1074, fin; 1075, input pipe; 1076, output pipe; 1077, second fan; 1078, drain pipe; 108, exhaust pipe; 109, placing rack; 1091, side plate; 1092, cross bar; 1093, convex bar; 110, telescopic rod. Detailed implementation manners

[0039] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0040] In the drawings of this solution, a refers to a sheet.

[0041] Refer to Figures 1-7 , a device for drying sheets using surplus steam from a boiler, comprising a drying chamber 100, wherein:

[0042] A bottom cover 102 is provided at the lower opening of the drying chamber 100, an air inlet hood 105 is provided on the side of the bottom cover 102, and a first fan 106 is provided at the end of the air inlet hood 105 to draw outside air into the drying chamber 100 through the first fan 106; preferably, the bottom of the bottom cover 102 is composed of two air guide inclined plates 1021, the distance between the two air guide inclined plates 1021 decreases from bottom to top, two air inlet hoods 105 are provided and are respectively located on the opposite sides of the two air guide inclined plates 1021, and two first fans 106 are correspondingly provided. The advantage is that the air drawn by the two first fans 106 flows from bottom to top in the drying chamber 100 and the flow is relatively balanced after being guided by the corresponding air guide inclined plates 1021;

[0043] A heat exchanger 103 is provided inside the drying chamber 100. The heat exchanger 103 is located above the bottom cover 102. The heat exchanger 103 includes a steam inlet 1031 and a water outlet 1032. A water tank 1033 is provided at the end of the water outlet 1032, and a water outlet pipe 1034 is provided at the bottom of the water tank 1033. When the existing boiler technology is in use, a large amount of surplus steam will be generated. The surplus steam is drawn by the existing technology, such as a blower, and enters the heat exchanger 103 through the steam inlet 1031. At the same time, the outside air is drawn into the drying chamber 100 by the first fan 106. Heat exchange will occur between the two. The air absorbs heat and the temperature rises to form hot air, which flows upward in the drying chamber 100, while the steam releases heat and becomes liquid, and is discharged through the water outlet 1032. The heat exchanger 103 can be realized by the existing technology and will not be elaborated.

[0044] A placement rack 109 is provided inside the drying chamber 100. An inlet and outlet is provided on the side of the drying chamber 100, and a bin cover 101 is provided at the inlet and outlet. By opening the bin cover 101, the board to be dried can be placed on the placement rack 109, or the already dried board can be taken away.

[0045] A top cover 104 is provided at the upper opening of the drying chamber 100. A condensation unit 107 is provided at the upper end of the top cover 104, and an exhaust pipe 108 is provided at the upper end of the condensation unit 107. After the hot air dries the board on the placement rack 109, it is discharged outward through the condensation unit 107 and the exhaust pipe 108. In this process, the hot air is condensed and dewatered by the condensation unit 107. On the one hand, it prevents the discharged hot air from being re-guided back into the drying chamber 100 by the first fan 106 and bringing moisture back into the drying chamber 100, which affects the drying effect. On the other hand, by collecting the amount of condensed water, the amount of moisture taken away when the board is dried can be clearly judged. Also, since the initial moisture content of the board can be detected by the existing technology, therefore, according to the amount of condensed water, the moisture content of the board in the drying chamber 100 can be indirectly judged. After the moisture content reaches the set value, the drying is terminated.

[0046] Embodiment 1

[0047] Refer to Figure 3 , the placement rack 109 includes a placement component, and two placement components are provided in the vertical direction.

[0048] The placement component includes side plates 1091. The extending direction of the side plates 1091 is parallel to the length direction of the drying chamber 100, and two side plates 1091 are provided along the width direction of the drying chamber 100.

[0049] A cross bar 1092 is provided between the two side plates 1091. The extending direction of the cross bar 1092 is parallel to the width direction of the drying chamber 100, and a plurality of cross bars 1092 are arranged in an array along the length direction of the drying chamber 100.

[0050] On both sides of the crossbar 1092 where two placing components are located and facing each other, convex bars 1093 are provided. A number of convex bars 1093 are arranged in an array along the extension direction of the crossbar 1092. The area between two adjacent convex bars 1093 is named the support area.

[0051] During use, the upper and lower ends of the plate to be dried are respectively placed in the support areas of the two placing components, and the plate to be dried is arranged obliquely. The advantages are as follows: When the hot air flows upward, it will gradually flow upward along the lower inclined surface of the obliquely arranged plate. Therefore, the contact between the hot air and the plate is more sufficient, and the drying effect is better.

[0052] Furthermore, if the plates are arranged vertically, then regarding the hot air between two adjacent plates as a stream of air, both sides of the air stream are in direct contact with the two plates respectively, while the middle part of the air stream is not in direct contact with the plates and conducts heat to the plates indirectly. Therefore, the drying effect is relatively worse.

[0053] Embodiment 2

[0054] Based on Embodiment 1, Embodiment 2 is proposed.

[0055] Refer to Figure 4 , the projection distance of the plate placed on the placing rack 109 in the width direction of the drying chamber 100 is equal to the distance between two adjacent plates.

[0056] The advantages are as follows: Taking Figure 4 the perspective as an example for elaboration, the hot air flows evenly from bottom to top in the drying chamber 100. Regarding the hot air between two adjacent plates as a stream of air, when the air stream flows upward, the air stream is equally divided into several parts along the width direction of the drying chamber 100. Among two adjacent parts of the air stream, the plate directly above the left air stream is named the left contact area, and the plate directly above the right air stream is named the right contact area. The left air stream will come into contact with the left contact area of the plate first. At the same time, when in contact, the left air stream will be blocked by the plate and its flow rate will slow down, while the right air stream is not blocked and has a faster flow rate compared to the left air stream and will come into contact with the right contact area of the plate earlier than the left air stream. That is to say, in Embodiment 2, the hot air stream between two adjacent plates will evenly contact each part of the lower inclined surface of the plate, and the hot air that comes into contact with the plate first has not undergone the drying behavior before contact. That is to say, it is equivalent to the plate receiving a balanced drying effect, so that the moisture content of each part of the plate can be kept in a same decreasing trend as much as possible, and thus the moisture content of each part of the dried plate is kept consistent.

[0057] Further, an intermittent component (not shown in the figure) is provided between the first fan 106 and the air inlet hood 105. Specifically, the intermittent component includes a valve pipe provided between the air inlet hood 105 and the first fan 106, a valve core provided in the valve pipe, a valve hole provided on the valve core, and a motor for driving the valve core to rotate. The significance lies in that when the motor starts, it drives the valve core to rotate at a constant speed, causing the valve hole to communicate with or disconnect from the valve pipe, so that air can flow into the drying chamber 100 intermittently, that is, the hot air flows upward intermittently to dry the board, thereby realizing the effect of the second embodiment.

[0058] Embodiment Three

[0059] Based on the second embodiment, the third embodiment is proposed.

[0060] Refer to Figure 5 , the side plate 1091 of the placing component located below is fixedly arranged in the drying chamber 100, and the side plate 1091 of the placing component located above is slidably arranged in the drying chamber 100 along the width direction of the drying chamber 100. An expansion rod 110 is arranged on the outer surface of the drying chamber 100. The output end of the expansion rod 110 extends into the drying chamber 100 and is connected to the side plate 1091 of the placing component located above. The expansion rod 110 can adopt existing electric expansion rod technology, etc., which will not be elaborated here.

[0061] The advantage is that: periodically drive the placing component located above to move through the expansion rod 110, so that the inclination direction of the board is to the left or to the right. In this way, both large surfaces of the board can be in direct contact with the hot air. The large surface refers to the side with the largest area of the board, further improving the drying effect.

[0062] Embodiment Four

[0063] Refer to Figure 6 And Figure 7 , the condensation unit 107 includes a condensation shell 1071. An exhaust pipe 108 is provided at the upper opening end of the condensation shell 1071. A partition plate 1072 is arranged in the condensation shell 1071. The partition plate 1072 is annular and divides the condensation shell 1071 into a non-communicating outer chamber and inner chamber. A connection hole 1073 is opened at the bottom of the inner chamber, and the connection hole 1073 is connected to the upper opening of the top cover 104.

[0064] Fins 1074 are arranged on the inner surface of the partition plate 1072, and a second fan 1077 is arranged in the inner chamber. The air flow flowing through the traction of the second fan 1077 flows towards the fins 1074.

[0065] A drain hole is opened at the bottom of the inner chamber, and a drain pipe 1078 is arranged at the drain hole.

[0066] The outer surface of the condensation shell 1071 is provided with an input pipe 1075 and an output pipe 1076 that communicate with the outer chamber. A cooling medium, such as cold water, flows into the outer chamber through the input pipe 1075 and flows out through the output pipe 1076, forming a flowing water in the outer chamber. At the same time, the hot air that has completed the drying operation in the drying chamber 100 enters the inner chamber through the top cover 104 and the connection hole 1073, and is drawn by the second fan 1077. Under the action of centrifugal force, it is thrown to the fin 1074, where heat exchange occurs to achieve condensation and water removal. The hot air after water removal is discharged through the exhaust pipe 108, and the condensed water is discharged through the drain pipe 1078.

[0067] Furthermore, water can be collected from the drain pipe 1078. This part of the water is the moisture brought out by the drying of the board. By weighing this part of the water, the moisture content of the board in the drying chamber 100 can be indirectly obtained.

[0068] The above description is only a preferred embodiment of the present invention and does not impose any formal limitations on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An apparatus for drying plates using surplus steam from a boiler, comprising a drying chamber (100), characterized in that, Inside the drying chamber (100), there is a heat exchanger (103) which is used to achieve heat exchange between air and the surplus steam of the boiler, so that the air absorbs heat to form hot air, and the hot air flows upward from bottom to top in the drying chamber (100); Inside the drying chamber (100), there is a placement rack (109). The placement rack (109) includes a placement component. There are two placement components arranged in the vertical direction. The placement component includes side plates (1091). The extending direction of the side plates (1091) is parallel to the length direction of the drying chamber (100). There are two side plates (1091) arranged in the width direction of the drying chamber (100). Between the two side plates (1091), there are cross bars (1092). The extending direction of the cross bars (1092) is parallel to the width direction of the drying chamber (100). A plurality of cross bars (1092) are arranged in an array along the length direction of the drying chamber (100). On the opposite sides of the cross bars (1092) of the two placement components, there are protruding bars (1093). A number of protruding bars (1093) are arranged in an array along the extending direction of the cross bars (1092). The area between two adjacent protruding bars (1093) is the support area; The projection distance of the plate placed on the placement rack (109) in the width direction of the drying chamber (100) is equal to the distance between two adjacent plates, and the hot air flows intermittently in the drying chamber (100).

2. The device for drying plates by using surplus steam of a boiler according to claim 1, characterized in that, The side plates (1091) of the placement component located below are fixedly arranged inside the drying chamber (100). The side plates (1091) of the placement component located above are slidably arranged inside the drying chamber (100) in the width direction of the drying chamber (100). On the outer surface of the drying chamber (100), there is a telescopic rod (110). The output end of the telescopic rod (110) extends into the drying chamber (100) and is connected to the side plate (1091) of the placement component located above; When drying the plate, the placement component located above is periodically driven to move by the telescopic rod (110).

3. A device for drying boards using surplus steam from a boiler according to claim 1 or 2, characterized in that, At the lower opening of the drying chamber (100), there is a bottom cover (102). On the side of the bottom cover (102), there is an air inlet hood (105). At the end of the air inlet hood (105), there is a first fan (106) through an intermittent component; The intermittent component includes a valve pipe arranged between the air inlet hood (105) and the first fan (106), a valve core arranged inside the valve pipe, a valve hole arranged on the valve core, and a motor for driving the valve core to rotate.

4. The device for drying plates by using surplus steam of a boiler according to claim 3, characterized in that, The bottom of the bottom cover (102) consists of two air guiding inclined plates (1021). The distance between the two air guiding inclined plates (1021) decreases from bottom to top. There are two air inlet hoods (105) which are respectively located on the opposite sides of the two air guiding inclined plates (1021), and there are two corresponding first fans (106).

5. The device for drying plates by using surplus steam of a boiler according to claim 3, characterized in that, On the side of the drying chamber (100), there is an inlet and outlet, and a bin cover (101) is arranged at the inlet and outlet.

6. The device for drying plates by using surplus steam of a boiler according to claim 3, characterized in that At the upper opening of the drying chamber (100), there is a top cover (104). At the upper end of the top cover (104), there is a condensation unit (107). At the upper end of the condensation unit (107), there is an exhaust pipe (108).

7. The device for drying plates by using surplus steam of a boiler according to claim 6, characterized in that, The condensation unit (107) includes a condensation housing (1071). An exhaust pipe (108) is arranged at the upper opening end of the condensation housing (1071). A partition plate (1072) is arranged inside the condensation housing (1071). The partition plate (1072) divides the inner cavity of the condensation housing (1071) into a non-communicating outer chamber and an inner chamber. A connection hole (1073) is provided at the bottom of the inner chamber. The connection hole (1073) is connected to the upper opening of the top cover (104).

8. The device for drying plates by using surplus steam of a boiler according to claim 7, characterized in that, A drain hole is provided at the bottom of the inner chamber. A drain pipe (1078) is arranged at the drain hole. An input pipe (1075) and an output pipe (1076) that are communicated with the outer chamber are arranged on the outer surface of the condensation housing (1071). When drying the board, the water discharged from the drain pipe (1078) is collected and weighed.

9. An apparatus for drying plates using surplus steam of a boiler according to claim 7 or 8, characterized in that, Fins (1074) are arranged on the inner surface of the partition plate (1072). A second blower (1077) is arranged in the inner chamber. The second blower (1077) is used to draw air to flow in the direction of the fins (1074).

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