Large-size ceramic plate drying device

Abstract

The utility model discloses a large-size ceramic plate drying device, which belongs to the technical field of drying equipment and comprises a boiler, a first heat exchanger, a drying oven, a circulating fan and a heat pump unit, the heat pump unit is connected with the drying oven through an air return pipe, a first air distribution pipeline is arranged on the bottom wall of the drying oven, and an exhaust pipeline communicated with the circulating fan is arranged on the top wall of the drying oven. Air distribution boxes are arranged on the side walls of the oven. The temperature balance and stability in the drying oven are improved, and the drying efficiency of ceramic plates is improved; the size of an air outlet channel is adjusted through a second strip plate, the air outlet flow can be adjusted by adjusting grating plates with different heights in the box body, formed laminar flow can conveniently correspond to ceramic plates placed at different heights, and the drying uniformity of the ceramic plates is improved; the heat pump assembly cools and dehumidifies the humid and hot air, reheats the humid and hot air and sends the humid and hot air back to the oven to circularly provide hot air; the heat pump assembly is mainly used for reheating air in the low-temperature drying stage, the boiler is put into work with large load in the high-temperature drying stage, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of drying equipment, specifically relating to a large-size ceramic plate drying device. Background Technology

[0002] Large-size ceramic filter plates (0.5 square meters or larger) are high-efficiency filtration tools based on porous ceramic materials. In their forming process, the raw materials are usually dried in a drying chamber. Multiple large-size ceramic filter plates are placed flat on material carts at a certain distance, and multiple material carts are pushed into the drying chamber for drying. However, in some existing drying chambers, the drying hot airflow only moves in one direction during the drying process, from bottom to top or from left to right. Inside the drying chamber, there is a large difference in the drying speed of the ceramic filter plates on the material carts near the air supply end and far from the air supply end. In addition, the large size of the ceramic filter plates leads to uneven drying speed, which reduces drying efficiency, prolongs drying time, and increases drying costs. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a large-size ceramic plate drying device to improve the drying uniformity of ceramic plates in the drying room and reduce drying costs.

[0004] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A large-size ceramic plate drying device includes a boiler, a first heat exchanger connected to the boiler, an oven connected to the first heat exchanger, a circulating fan connected to the oven, and a heat pump unit connected to the circulating fan. The heat pump unit is connected to the oven via a return air duct. The bottom wall of the oven is provided with a first air distribution duct communicating with the first heat exchanger. The top wall of the oven is provided with an exhaust duct communicating with the circulating fan. The side wall of the oven is provided with an air distribution box communicating with the return air duct.

[0006] Furthermore, the air distribution box includes a box body, a plurality of first plates disposed on the front of the box body, and a plurality of second plates movably connected to the box body. An air outlet channel is formed between two adjacent first plates, and the second plates can move up and down to adjust the size of the air outlet channel.

[0007] Furthermore, the front of the housing is connected to a limit bolt, and the second plate is provided with an adjustment hole corresponding to the limit bolt.

[0008] Furthermore, multiple first plates are arranged in parallel, and multiple second plates are arranged in parallel.

[0009] Furthermore, the first air distribution duct is provided with multiple first air distribution holes, and the airflow at the outlet of the first air distribution hole is parallel to the bottom surface of the oven.

[0010] Furthermore, the first heat exchanger is equipped with a first fan, and the first heat exchanger is connected to the first air distribution pipe through an air supply pipe.

[0011] Furthermore, the return air duct is connected to the supply air duct via an intermediate pipe, and an intermediate valve is provided on the intermediate pipe.

[0012] Furthermore, the air distribution box is provided in more than one manner.

[0013] Furthermore, the heat pump unit includes a compressor, a condenser connected to the compressor, an expansion valve connected to the condenser, and an evaporator connected to the expansion valve.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0015] 1. By setting up the first air distribution duct and the exhaust duct, and setting the air distribution box on the side wall of the oven to allow circulating air to enter the oven, and forming air outlets at the bottom and side walls of the oven, the temperature balance and stability inside the oven are improved, the drying speed difference of large-size ceramic filter plates is reduced, and the drying efficiency is improved.

[0016] 2. The front of the air distribution box is equipped with multiple first plates and second plates. The size of the air outlet channel can be adjusted by adjusting the second plate, and the air flow can be adjusted by adjusting the grid plates of different heights inside the box. The first plates and second plates are set in parallel, and the laminar flow formed is convenient to correspond with the large-size ceramic filter plates placed at different heights, thereby improving the drying uniformity of the ceramic plates.

[0017] 3. By setting up a boiler and heat pump components, the heat pump components cool and dehumidify the hot and humid air, then reheat it and send it back to the oven, providing hot air in a circulating manner, thus saving energy and reducing consumption;

[0018] 4. During the low-temperature drying stage, the heat pump components mainly reheat the air, while during the high-temperature drying stage, the boiler is put into operation at high load, thus saving energy and reducing consumption. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the device according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the oven structure in the embodiment;

[0021] Figure 3 This is a schematic diagram of the heat pump unit structure in an embodiment;

[0022] Figure 4 This is a schematic diagram of the air distribution box structure in an embodiment;

[0023] Figure 5 This is the second plate in the embodiment;

[0024] Figure 6 This is a schematic diagram of the cross-sectional structure of the air distribution box in the embodiment. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0026] like Figure 1 and Figure 2 As shown, a large-size ceramic plate drying device includes a boiler 1, a first heat exchanger 2, an oven 3, a circulating fan 4, and a heat pump unit 5. The boiler 1 adopts an electric heating thermal oil furnace or a gas-fired thermal oil furnace. In this embodiment, an existing electric heating thermal oil furnace is used, such as the electric heating thermal oil furnace of model ry015 produced by Jiangsu Ruiyuan Heating Equipment Technology Co., Ltd., with a heating power of 60KW and a temperature control accuracy of ±1℃. The thermal oil outlet of the boiler 1 is equipped with a temperature sensor to monitor the temperature of the oil outlet. The first heat exchanger 2 is connected to the boiler 1. The first heat exchanger 2 is a finned tube heat exchanger. The first heat exchanger 2 is equipped with heat exchange tubes. The inlet and outlet of the heat exchange tubes are connected to the inlet and outlet of the heat transfer oil of the boiler 1. The high-temperature heat transfer oil enters the heat exchange tubes and flows through the tubes. The first heat exchanger 2 is also equipped with an air inlet and outlet. The first fan 21 is equipped with a blower on the air inlet of the first heat exchanger 2. The first fan 21 draws outside air into the first heat exchanger 2. After exchanging heat with the heat transfer oil on the tube wall, the air is discharged from the air outlet of the first heat exchanger 2. The temperature of the air increases after heat exchange. The air outlet of the first heat exchanger 2 is connected to an air supply pipe 22. The heated air is discharged from the air supply pipe 22. The air supply pipe 22 is equipped with a temperature sensor to monitor the air temperature inside the air supply pipe 22.

[0027] like Figure 1 and Figure 2As shown, the oven 3 is rectangular, with an internal space for accommodating a material cart. The oven 3 has a door on the front for opening and closing. In use, the door is opened, the ceramic plate is placed on the drying rack of the material cart, the material cart is pushed into the oven 3, and then the door is closed. The oven 3 is connected to the first heat exchanger 2. The bottom wall of the oven 3 has a first air distribution duct 7, which connects to the first heat exchanger 2 via an air supply pipe 22 (the connecting pipe between the first air distribution duct 7 and the air supply pipe 22 is inside the bottom wall of the oven 3, not shown in the figure). The first air distribution duct 7... The front of the oven 3 extends towards the back of the oven 3. Three first air distribution ducts 7 are arranged in parallel. Multiple first air distribution holes 71 are provided on the first air distribution ducts 7. The cross-section of the first air distribution ducts 7 is rectangular. The first air distribution holes 71 are located on both sides of the first air distribution ducts 7. The first air distribution holes 71 on both sides are symmetrically distributed and the multiple first air distribution holes 71 on each side are equally spaced. The airflow at the outlet of the first air distribution holes 71 is parallel to the bottom surface of the oven 3. The hot airflow discharged from the air duct 22 passes through the first air distribution ducts 7 and then enters the oven 3 through the first air distribution holes 71 for drying.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, an exhaust duct 31 is provided in the middle of the top wall of the oven 3. The exhaust duct 31 is parallel to the first air distribution duct 7. The cross-section of the exhaust duct 31 is also rectangular. First exhaust ports 311 are provided on both sides of the exhaust duct 31. The first exhaust ports 311 on both sides are symmetrically distributed and multiple first exhaust ports 311 on each side are equally spaced. The circulating fan 4 is installed on the top wall of the oven 3. The exhaust duct 31 is connected to the air inlet of the circulating fan 4. When the circulating fan 4 is working, it forms a negative pressure. The hot and humid air in the oven 3 enters the exhaust duct 31 from the first exhaust port 311. The air outlet of the circulating fan 4 is connected to the circulating duct 41. The circulating fan 4 is connected to the heat pump unit 5 through the circulating duct 41. The heat pump unit 5 is connected to the oven 3 through the return air pipe 6.

[0029] like Figure 1 , Figure 2 and Figure 3As shown, the heat pump unit 5 includes a compressor 51, a condenser 52, an expansion valve 53, and an evaporator 54. The condenser 52 is connected to the compressor 51, the expansion valve 53 is connected to the condenser 52, and the evaporator 54 is connected to the expansion valve 53 and the compressor 51. The refrigerant circulates between the compressor 51, condenser 52, expansion valve 53, and evaporator 54 to transfer heat. The condenser 52 and evaporator 54 act as heat exchangers for the air. The humid and hot air from the circulation pipe 41 is cooled down after passing through the evaporator 54, and the moisture in the air condenses into water, thus cooling and dehumidifying the humid and hot air. Then the air enters the condenser 52, where it is reheated to achieve reheating. The reheated air returns to the drying oven 3 through the return air pipe 6 to continue circulating and drying. The heat pump unit 5 uses an existing heat pump, such as the YJR-240FTC heat pump equipment produced by Jiangsu Oubei New Energy Development Co., Ltd., with an outlet air temperature of 85℃ and a rated dehumidification capacity of 24L / h.

[0030] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, air distribution boxes 8 are respectively provided on the two inner side walls of the oven 3 (an air distribution box 8 can also be provided on the other inner side wall of the oven 3 according to actual needs). The back of the air distribution box 8 is connected to the return air pipe 6. The air distribution box 8 on the right side is connected to the return air pipe 6 through the first return air branch pipe 61, and the air distribution box 8 on the left side is connected to the return air pipe 6 through the second return air branch pipe 62. The first return air branch pipe 61 and the second return air branch pipe 62 are respectively provided with butterfly valves (butterfly valves are not shown in the figure), and the opening and closing of the corresponding return air branch pipes are controlled by the butterfly valves. The air distribution box 8 includes a box body 81, which is a flat rectangular box with an opening on the front. Multiple first plates 82 are arranged on the front of the box body 81 at equal intervals from top to bottom, thereby blocking part of the opening area on the front of the box body 81. An air outlet channel 801 (the unblocked area) is formed between two adjacent first plates 82. The reheated air in the air distribution box 8 is ejected from the air outlet channel 801 and returns to the oven 3. The multiple first plates 82 are arranged in parallel, and the reheated air ejected from the air outlet channel 801 forms a laminar flow, which facilitates uniform heating in the oven 3, improves the temperature uniformity of the air in the oven 3, and ensures the uniformity of drying of the layered ceramic plates. Multiple second plates 83 are movably connected to the front of the housing 81. The multiple second plates 83 are arranged in parallel to form a grille. The second plates 83 can move up and down to adjust the size of the air outlet 801. The up and down movement of the second plates 83 is achieved by limiting bolts 811. Two rows of limiting bolts 811 are connected to both sides of the front of the housing 81. Adjustment holes 831 corresponding to the limiting bolts 811 are provided on both sides of the second plates 83. The adjustment holes 831 are strips extending up and down. The up and down position of the second plates 83 can be adjusted by adjusting the relative position of the second plates 83 and the limiting bolts 811. After the second plates 83 move up and down, the size of the air outlet 801 can be adjusted. When the second plates 83 move to the predetermined position, the corresponding two limiting bolts 811 are tightened to fix the position of the second plates 83. At this time, the second plates 83 block part of the air outlet 801. The gap between the upper end of the second plates 83 and the lower end of the first plates 82 above allows reheated air to pass through. The second plate 83 at different heights can adjust the size of the air outlet channel 801 at different heights, thereby controlling the flow rate of reheated air at the corresponding height.

[0031] like Figure 1 and Figure 2As shown, the second return air branch pipe 62 is connected to the supply air pipe 22 through the intermediate pipe 63, so that the reheated air from the return air pipe 6 can enter the supply air pipe 22 through the intermediate pipe 63. The intermediate pipe 63 is equipped with an intermediate valve 631, which is an existing butterfly valve, to control the opening and closing of the intermediate pipe 63. The supply air pipe 22 is equipped with a supply air valve 221 at the front end to control the opening and closing of the air outlet of the first heat exchanger 2 to the supply air pipe 22. When the ceramic plate is in the low-temperature drying stage (<60℃), the air supply valve 221 is slightly open, the intermediate valve 631 is open, the heat pump unit 5 is working, and the reheated air returns to the oven 3 through the air distribution boxes 8 on both sides. At the same time, the reheated air also enters the oven 3 together with a small portion of the air heated by the first heat exchanger 2 through the air supply pipe 22 and the first air distribution pipe 7. At this time, the boiler 1 is operating at a low load. When the ceramic plate is in the high-temperature drying stage (80℃-90℃), the air supply valve 221 is fully open, the intermediate valve 631 is closed, the boiler 1 is working, and the high-temperature air heated by the first heat exchanger 2 enters the oven 3 through the first air distribution pipe 7. The heat pump unit 5 is operating at a low load, and the reheated air returns to the oven 3 through the air distribution boxes 8 on both sides, mixing with the high-temperature air entering through the first air distribution pipe 7. This prevents local overheating in the oven 3, ensures uniform drying, and prevents local high temperatures from causing the ceramic plate to crack.

[0032] Drying process of large-size ceramic filter plates:

[0033] The billets are placed in three layers from top to bottom on the drying rack. During the low-temperature drying stage, the temperature is controlled at 50℃-60℃ for 8-12 hours, depending on the different specifications, sizes, and thicknesses. During this stage, boiler 1 operates at low load, and heat pump unit 5 operates mainly to reduce energy consumption. During the high-temperature drying stage, boiler 1 operates at high load. The high-temperature air, heated by the first heat exchanger 2, enters the drying oven 3, and the temperature is controlled at 80℃-90℃. The specific temperature is set according to the thickness and material of the billet. The temperature gradually increases, and the high-temperature drying lasts for 15-24 hours. When the residual moisture content of the product is ≤3%, it can be loaded into the kiln for firing.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A large-size ceramic plate drying device, characterized in that, The oven includes a boiler (1), a first heat exchanger (2) connected to the boiler (1), an oven (3) connected to the first heat exchanger (2), a circulating fan (4) connected to the oven (3), and a heat pump unit (5) connected to the circulating fan (4). The heat pump unit (5) is connected to the oven (3) through a return air pipe (6). The bottom wall of the oven (3) is provided with a first air distribution pipe (7) connected to the first heat exchanger (2). The top wall of the oven (3) is provided with an exhaust pipe (31) connected to the circulating fan (4). The side wall of the oven (3) is provided with an air distribution box (8) connected to the return air pipe (6).

2. The large-size ceramic plate drying device according to claim 1, characterized in that, The air distribution box (8) includes a box body (81), a plurality of first plates (82) disposed on the front of the box body (81), and a plurality of second plates (83) movably connected to the box body (81). An air outlet channel (801) is formed between two adjacent first plates (82) and the second plates (83) can move up and down to adjust the size of the air outlet channel (801).

3. The large-size ceramic plate drying device according to claim 2, characterized in that, The front of the housing (81) is connected to a limiting bolt (811), and the second plate (83) is provided with an adjustment hole (831) corresponding to the limiting bolt (811).

4. The large-size ceramic plate drying device according to claim 2, characterized in that, Multiple first plates (82) are set in parallel, and multiple second plates (83) are set in parallel.

5. The large-size ceramic plate drying device according to claim 1, characterized in that, The first air distribution duct (7) is provided with multiple first air distribution holes (71), and the airflow at the outlet of the first air distribution hole (71) is parallel to the bottom surface of the oven (3).

6. The large-size ceramic plate drying device according to claim 1, characterized in that, The first heat exchanger (2) is equipped with a first fan (21), and the first heat exchanger (2) is connected to the first air distribution pipe (7) through the air supply pipe (22).

7. The large-size ceramic plate drying device according to claim 6, characterized in that, The return air duct (6) is connected to the supply air duct (22) through an intermediate pipe (63), and an intermediate valve (631) is provided on the intermediate pipe (63).

8. The large-size ceramic plate drying device according to claim 1, characterized in that, The air distribution box (8) is provided in more than one manner.

9. The large-size ceramic plate drying device according to claim 1, characterized in that, The heat pump unit (5) includes a compressor (51), a condenser (52) connected to the compressor (51), an expansion valve (53) connected to the condenser (52), and an evaporator (54) connected to the expansion valve (53).

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