CN201281523Y - Energy-conserving environment protection coated oven system - Google Patents

Abstract

A new type of energy-saving and environment-friendly coating oven system, including an air intake main pipe and several ovens; There are fresh air passages and exhaust air passages, the fresh air passages and exhaust air passages are separated by metal walls, the inlet of the fresh air passages and the outlet of the exhaust air passages are located at one end of the heat recovery exchanger, and the outlets of the fresh air passages and the entrances of the exhaust air passages are located at the thermal energy The other end of the recovery exchanger; the fresh air channel is connected to the air inlet of the gas filter; the outlets of the exhaust fans of several ovens located in the back are also connected to the air inlet of the gas filter, and the rest are located in the other ovens in the front The air outlet of the exhaust fan is connected to the inlet of the waste gas passage; the air outlet of the gas filter device is connected to the air intake main pipe. The utility model can effectively save energy, reduce high-temperature gas discharge, and reduce air pollution.

Description

Energy saving and environmental protection coating oven system

technical field

The utility model belongs to the technical field of coating ovens, in particular to a novel energy-saving and environment-friendly coating oven system.

Background technique

At present, the rapid development of my country's economy has brought about the rapid development of the packaging industry, and coating equipment is the main basic equipment for pre-press production equipment in the printing and packaging industry. But there are the following deficiencies in the existing coating machine:

1. When the traditional coating machine is working, the fresh air outside the oven is sucked into the electric heating device. After the air is heated and heated, it is blown to dry the film material in the oven, and then all the hot air in the oven is discharged to the outside. In this way, causing The exhaust gas containing a lot of heat energy and volatile solvent gas is directly discharged into the air, which not only causes air pollution, but also wastes a lot of heat energy.

2. Due to the above reasons, people have tried to connect part of the exhaust air in the oven back to the air inlet of the heat exchanger through the bypass valve. Although this saves energy, it also causes dust particles and solvent grains in the hot air of the oven. It returns to the oven with the secondary circulation of the hot air, which causes secondary pollution to the film material in the oven and affects the coating quality. At the same time, due to the long-term circulation of hot air containing volatile solvent gas, when the concentration of volatile solvent gas accumulated in the oven and electric heating device reaches a certain level, an explosion may occur, so there is a serious safety hazard.

3. Due to the large temperature difference between the air entering and leaving the electric heating device, in order to complete the heating in a short time, the power of the electric heating device must be increased, thereby increasing the power capacity burden of the factory. In addition, since there is a certain humidity in the indoor air, which affects the drying effect to a certain extent, in order to achieve the drying effect, it is necessary to increase the air flow rate and use "strong" hot air to dry the film. However, the flow rate of the air passing through the heat exchanging element in the heat exchanger is too high, and the contact time between the heat exchanging element and the air is short, so that the heat exchanging efficiency of the electric heating device is low.

4. In the oven of the existing coating machine, the way of blowing and exhausting the drying air is to take in the air from the strip-shaped blowing nozzle located in the center of the oven top wall, and exhaust the air from the return air outlets located on the left and right sides of the oven. This structure and working method cause the wind pressure in the center of the oven to be inconsistent with that on the left and right sides of the oven, that is, the positive wind pressure in the center of the oven is high, while the positive wind pressure on the left and right sides of the oven is small and the negative wind pressure is large, so it is easy to make the film in the oven Produce up and down jitter. In addition, due to the unreasonable airflow direction of the working chamber in the oven, the shovel-type airflow cannot be formed on the surface of the film, which greatly reduces the drying effect and aggravates the third problem above.

Contents of the invention

The purpose of this utility model is to overcome the above shortcomings and provide a new type of energy-saving and environment-friendly coating oven system, which can effectively save energy, reduce high-temperature gas emissions, and reduce air pollution.

In order to achieve the above-mentioned purpose, the energy-saving and environment-friendly coating oven system of the present utility model includes an air inlet main pipe and several ovens; There is an electric heating device; the air intake main pipe is connected to the air intake fan of each section of the oven; its main feature is that it is also equipped with a heat recovery exchanger and a gas filter device; each heat recovery exchanger is equipped with a fresh air channel and an exhaust gas channel, The fresh air passage and the exhaust air passage are separated by a metal wall, the inlet of the fresh air passage and the outlet of the exhaust air passage are located at one end of the heat energy recovery exchanger, and the outlet of the fresh air passage and the entrance of the exhaust air passage are located at the other end of the heat energy recovery exchanger; The channel is connected to the air inlet of the gas filter device; the outlets of the exhaust fans of several ovens located at the back are also connected to the air inlet of the gas filter device, and the outlets of the exhaust fans of the other several ovens located in the front are connected to The inlet of the waste gas channel; the air outlet of the gas filter device is connected to the main intake pipe. In this application document, when considering the relationship between the front and back positions of each oven, it is considered according to the path of the film material. During work, the oven that the film material passes through first is the oven located in the front, and the oven that passes through it is the oven located behind. The so-called gas filter device refers to a device that can filter volatile solvent molecules, dust impurities, and tiny crystal particles in the gas.

Preferably, the oven has 5 to 6 sections in total, wherein the air outlets of the exhaust fans located in the front 2 to 3 ovens are connected to the exhaust gas channel, while the air outlets of the exhaust fans of the other ovens located in the back are connected to the gas outlet. The air inlet of the filter unit.

Even better, each section of the oven is divided into three parts: return air chamber, air inlet chamber and working chamber from top to bottom; multiple parallel film material guide rollers are arranged in the working chamber; A number of strip-shaped blowing nozzles facing the working chamber, the long direction of the strip-shaped blowing nozzles is parallel to the axial direction of the film material guide roller; the return air chamber and the working chamber are connected by multiple short return air pipes, and each return air The pipe wall of the air short pipe passes through the inner cavity space of the air inlet chamber, the opening at the upper end of each short return air pipe is located on the top wall of the air inlet chamber and connects with the return air chamber, and the opening at the lower end of each short return air pipe is located at the air inlet The bottom wall of the cavity is connected to the working cavity; the short return air pipes are arranged in several rows, and the arrangement direction of each row of short return air pipes is parallel to the long direction of the long blowing nozzle, and the above-mentioned rows of short return air pipes are connected with several long Strip blowing nozzles are distributed alternately; the air outlet of the electric heating device is connected to the air inlet of the air inlet chamber; the air outlet of the return air chamber is connected to the exhaust fan.

The shell of the heat recovery exchanger can be cylindrical.

The gas filtering device includes a closed box body, and a removable and washable filter screen, a multi-stage removable and washable plant activated carbon filter screen, and a low-noise axial flow fan are installed inside the closed box body.

The gas filter device can also be a photocatalyst air purification device, which includes: an antibacterial filter for removing bacteria in the air, a removable and washable filter screen made of fiber layers, and a filter for removing fine dust. and a photocatalyst collector for volatile organic compounds, and a deodorizing filter for removing volatile solvent molecules.

Each oven is equipped with seven long blowing nozzles and 28 short circular return air pipes, and the 28 short circular return air pipes are arranged in seven rows, and each row is equipped with four short circular return air pipes .

The utility model has the following advantages and effects:

1. The utility model is equipped with a heat energy recovery exchanger, which can discharge high-temperature exhaust gas through the exhaust gas channel, and inhale outdoor fresh air through the fresh air channel. Since the fresh air channel and the exhaust gas channel are only separated by metal walls, and the discharge flow direction of the high-temperature exhaust gas It is opposite to the flow direction of the outdoor fresh air, so the fresh air inhaled and the high-temperature exhaust air discharged outside can fully exchange heat, and the fresh air that has just been sucked into the system can be preliminarily raised to increase the temperature of the inhaled outdoor fresh air as much as possible. Most of the hot air is continuously recycled inside the oven system, and only a small amount of exhaust gas is discharged in the form of low temperature, so the energy consumption of the coating tank can be greatly reduced, and the large amount of heat contained in the high-temperature exhaust gas can be reused to improve the utilization rate of heat energy. Save energy, but also reduce the cost of heat insulation for pipelines.

2. The gas filtering device in the utility model has the following effects: a. Air purification is realized through multi-stage filter screens; b. Volatile solvent gases in circulating hot air can be adsorbed and filtered, and at the same time continuously supplied by outdoor fresh air, which can Ensure that the concentration of volatile solvent gas in the oven gas is within a safe range; c, the filter device of the present utility model improves the circulation speed of hot air in the pipeline through the axial flow fan, thereby indirectly reducing the blowing and exhaust fan in the oven. The pressure loss reduces the power capacity of the blower and exhaust fan in the oven; d. The filter screen can be disassembled and washed, which is convenient for operation and improves work efficiency.

3. The utility model distributes the elongated blowing nozzles in the oven and the short return air pipes alternately through the reasonable fluid design inside the oven. In this way, the degree of uneven air pressure inside the working chamber of the oven is greatly reduced. Moreover, when working, the long blowing nozzles form a positive wind pressure, while the short return air pipe forms a negative wind pressure. When the high-temperature and high-pressure hot air is sprayed from each long blowing nozzle in the oven, it is quickly blown by the short return air pipe. Suck away, since the openings at the lower end of the long blowing nozzle and the short return air pipe are located on the bottom wall of the air inlet chamber, the path of the airflow in the working chamber is arc-shaped, and the starting point of the arc is located at the long blowing nozzle. The end point is located at the opening at the lower end of the short return air pipe, thereby forming a wind shovel airflow on the surface of the film; the wind shovel air quickly blows over the surface of the film, and is quickly discharged from the short return air pipe back into the return air cavity, which can quickly Effectively dry the surface of the film, and the pressure formed on the surface of the film is very small, and the pressure of each part is uniform, so as to avoid the shaking of the film. The so-called wind shovel airflow refers to the airflow with an arc-shaped path, and when the arc-shaped airflow passes through the surface of the film, its flow direction is basically parallel to the surface of the film, as if shoveling over the surface of the film, so it is called "wind shovel airflow" .

4. During the working process of the coating oven system, the concentration of volatile solvent gas in the gas discharged from the front oven is high, while the concentration of volatile solvent gas in the gas discharged from the back oven is already very low, so in the utility model, Connect the air outlets of the exhaust fans of several ovens in the front to the exhaust gas channel to discharge the exhaust gas in this part; This part of the waste gas is filtered and then recycled. In this way, the thermal energy can be fully recycled, and the concentration of the volatile solvent gas in the circulating air can be controlled within a certain safe range to ensure safety.

In a word, the utility model can save energy, reduce high-temperature gas discharge, reduce air pollution, improve work efficiency, ensure product quality, and solve the problems of high energy consumption, serious pollution, potential safety hazards, and inconvenient cleaning and operation of the existing coating equipment. Wait for the problem.

Description of drawings

Figure 1 is a schematic diagram of the structure of a traditional coating oven system.

Fig. 2 is a schematic diagram of the plane position relationship between the air return port and the blowing nozzle of each oven in the traditional coating oven system.

Fig. 3 is a schematic structural diagram of a coating oven system in a specific embodiment of the present invention.

Fig. 4 is a schematic diagram of the vertical structure and working principle of the air intake and exhaust of each oven section of the utility model.

Fig. 5 is a schematic diagram of the planar positional relationship between the return air short pipe and the blowing nozzle of each section of the oven working chamber in Fig. 4 .

Fig. 6 is a schematic diagram of the internal structure of the gas filtering device.

Fig. 7 is a schematic diagram of the structure and working principle of the heat energy recovery exchanger.

Fig. 8 is a schematic diagram of the B-B cross-sectional structure in Fig. 7 .

Detailed ways

As shown in Figure 1, when the traditional coating oven system is working, each section of the oven directly sucks the fresh air outside the oven into the electric heating device 13 inside the oven 1, and blows it into the working chamber of the oven after heating up to reduce the temperature of the film material. After drying, the exhaust fan 12 of each oven will discharge the hot air to the outside, so that the waste gas containing a large amount of heat energy and a large amount of volatile solvent gas is directly discharged into the air, as shown by the arrow in Figure 1. pollute and waste a lot of heat energy.

As shown in Figure 2, in a traditional coating oven system, each oven has seven strip blowing nozzles 17 and six rectangular return air outlets 181, the hot air is heated by the electric heating device 13, and then the hot air is heated by the strip blowing nozzle 181. The mouth 17 blows air to the film material; then it is withdrawn by six rectangular air return ports 181, and the waste gas in the oven is discharged by the exhaust fan. This structure and working method cause a large difference in wind pressure between the center of the oven and the left and right positions of the oven, that is, the positive wind pressure at the center of the oven is large, while the positive wind pressure at the left and right sides of the oven is small and the negative wind pressure is large. The direction of the airflow in the oven is unreasonable, and the wind shovel airflow cannot be formed on the surface of the film, so it is easy to cause the film in the oven to shake up and down, and the drying effect is also greatly reduced.

As shown in Fig. 3, the energy-saving and environment-friendly coating oven system of a kind of specific embodiment of the utility model has five ovens 1; Every oven is provided with intake fan 11, exhaust fan 12, electric heating device 13; There is an air intake main pipe 4, two heat recovery exchangers 2, and a set of gas filter devices 3, wherein the air intake main pipe 4 is connected to the air intake fan 11 of each section of the oven;

As shown in Fig. 6, the gas filtering device 3 comprises a closed casing 31, and the casing 31 is provided with two air inlets, i.e. a fresh air inlet 32 and a circulating high-temperature exhaust gas inlet 33, and an air outlet 34 is also provided. A removable and washable filter screen 35, a two-stage removable and washable plant activated carbon filter screen 36, and a low-noise axial flow fan 37 are installed inside the closed casing.

As shown in Fig. 3, Fig. 7 and Fig. 8, the shell of each heat energy recovery exchanger 2 is cylindrical, and each heat energy recovery exchanger is provided with a fresh air passage 21 and an exhaust air passage 22, and the fresh air passage 21 and the exhaust air passage 22 are composed of Metal wall 23 isolates, and the inlet of fresh air passage 21 and the outlet of waste gas passage 22 are positioned at one end of heat energy recovery exchanger 2, and the outlet of fresh wind passage 21 and the entrance of waste gas passage 22 are positioned at the other end of heat energy recovery exchanger 2; The entrance of the fresh air passage of the first heat recovery exchanger 2 (the heat recovery exchanger located at the top of the drawing in Fig. 3 ) forms the total fresh air inlet of the whole system, and the outlet of the fresh wind passage of the first heat recovery exchanger 2 communicates To the inlet of the fresh air passage of the second heat energy recovery exchanger 2; the outlet of the fresh air passage of the second heat energy recovery exchanger 2 (the heat energy recovery exchanger located at the bottom of the drawing in Figure 3) is communicated with the gas filter device 3 The fresh air inlet 32 of the fresh air, the air outlet of the exhaust fan 12 of the three-section oven 1 at the back is connected to the circulating high-temperature waste gas inlet 33 of the gas filter device by the recycling pipeline 5, and the air outlet 34 of the gas filter device is connected to the air inlet The main pipe 4; the air outlet of the exhaust fan 12 of the first oven in the front is connected to the entrance of the waste gas channel 22 of the first heat recovery exchanger 2, and the air outlet of the exhaust fan 12 of the second oven in the front It is connected to the inlet of the waste gas passage 22 of the second heat energy recovery exchanger 2, and the outlets of the waste gas passage 22 of the two heat energy recovery exchangers are connected to the total exhaust gas outlet of the whole system.

As shown in Fig. 4 and Fig. 5, each section of the oven is divided from top to bottom into three parts: the return air chamber 14, the air inlet chamber 15, and the working chamber 16; multiple parallel film material guide rollers 19 are arranged in the working chamber 16; The bottom wall of the air inlet chamber 15 is provided with seven strip-shaped blowing nozzles 17 facing the working chamber, and the long direction of the strip-shaped blowing nozzles 17 is parallel to the axial direction of the film material guide roller 19; The room is connected by twenty-eight vertical circular return air short pipes 18, the pipe wall of each return air short pipe 18 passes through the inner cavity space of the air inlet cavity 15, and the opening at the upper end of each return air short pipe 18 is located at The top wall of the air inlet chamber 15 is connected to the return air chamber 14, and the openings at the lower ends of the short return air pipes 18 are located at the bottom wall of the air inlet chamber 15 and communicated with the working chamber 16; twenty-eight return air short pipes 18 are arranged into Seven rows, each row is provided with four circular return air short pipes 18, and the arrangement direction of each row of return air short pipes is parallel to the long direction of the elongated blowing nozzle 17; Shaped blowing nozzles are distributed alternately; the air outlet of the electric heating device 13 is connected to the air inlet of the air inlet chamber 15; the air outlet of the return air chamber 14 is connected to the exhaust fan 12.

When the above-mentioned embodiment works, the film 6 passes above the film material guide roller 19 in the working chamber, and the gas flow direction is shown by arrows in Fig. 3 , Fig. 4 , Fig. 7 and Fig. 6 . After the outdoor low-temperature fresh air enters the fresh air channel 21 of the heat recovery exchanger 2 for preheating and heating (as shown in black in Figure 7), it enters the gas filter 3 through the fresh air inlet 32, and the fresh air is conditioned by the gas filter 3. Carry out filtering and dust removal, and then input five ovens 1 respectively through air intake main pipe 4; Inside each oven, the air is transported by the intake fan 11 through the electric heating device 13, and reaches the set temperature after the electric heating device 13 further heats up. temperature, becomes working hot air, enters the air inlet chamber 15, and blows into the working chamber 16 through the elongated blowing nozzle 17 positioned at the bottom wall of the air inlet chamber 15, and forms a wind shovel airflow on the film surface in the working chamber 16 (as shown in FIG. 4), the wind shovel airflow blows through the surface of the film 6, and then is sucked into the return air short pipe 18, enters the return air cavity 14, and then is discharged from each section of the oven 1 by the exhaust fan 12; the first two sections After the waste gas of the oven 1 is discharged from the oven, it passes through the waste gas channel 22 of the heat energy recovery exchanger (as shown in the hollow in Figure 7). The waste gas in 22 cools down, and the fresh air in fresh air channel 21 heats up. Afterwards, these waste gases are discharged from the system through the outlet of waste gas channel 22 and the exhaust gas outlet of the system; The recycling pipeline 5 re-enters the gas filter device 3 through the circulating high-temperature exhaust gas inlet 33, and the gas filter device 3 filters, removes dust, impurities, and residual solvent gas from this part of the circulating gas, and becomes clean hot air. The interior of the filter device 3 is mixed with the fresh air inhaled by the fresh air channel 21 of the heat energy recovery exchanger 2, and then re-introduced into the air intake main pipe 4 through the air outlet 34 of the gas filter device, and redistributed into each oven 1 by the air intake main pipe 4. So recycled.

Claims (7)

1. an energy-conserving and environment-protective coater oven system comprises inlet manifold and some joint baking ovens; Every joint baking oven is provided with air inlet blower fan, air exhauster, and the passage between air inlet blower fan and air exhauster is provided with electric heater unit; The inlet manifold is communicated to the air inlet blower fan that respectively saves baking oven; It is characterized in that: also be provided with energy recovery interchanger, gas-filtering device; Each energy recovery interchanger is provided with bright wind passage and exhaust steam passage, bright wind passage and exhaust steam passage are isolated by metallic walls, the inlet of bright wind passage and the outlet of exhaust steam passage are positioned at an end of energy recovery interchanger, and the outlet of bright wind passage and the inlet of exhaust steam passage are positioned at the other end of energy recovery interchanger; Bright wind channel connection is to the air inlet of gas-filtering device; The air outlet of air exhauster that is positioned at some joint baking ovens of back also is communicated to the air inlet of gas-filtering device, and all the other air outlets of air exhauster that are positioned at other some joint baking ovens of front are communicated to the inlet of exhaust steam passage; The air outlet of gas-filtering device is communicated to described inlet manifold.

2, energy-conserving and environment-protective coater oven according to claim 1 system, it is characterized in that: described baking oven has 5～6 joints, the air outlet that wherein is positioned at the air exhauster of front 2～3 joint baking ovens is communicated to exhaust steam passage, and the air outlet of air exhauster that all the other are positioned at the baking oven of back is communicated to the air inlet of gas-filtering device.

3, energy-conserving and environment-protective coater oven according to claim 1 and 2 system, it is characterized in that: every joint baking oven from top to bottom is divided into return air chamber, air-inlet cavity, working chamber three parts; Be furnished with many parallel coating materials deflector rolls in the working chamber; Diapire at air-inlet cavity offers some the strip blowing mouths towards working chamber, and the length of strip blowing mouth is to being parallel to the axial of coating materials deflector roll; Be communicated with by many return air short tubes between return air chamber and the working chamber, the tube wall of each bar return air short tube passes the intracavity space of air-inlet cavity, the opening of each bar return air upper end of short tube is positioned at the roof of air-inlet cavity and is communicated with the return air chamber, and the opening of each bar return air short tube lower end is positioned at the diapire of air-inlet cavity and is communicated with working chamber; The return air short tube is arranged in several rows, the length that the orientation of each row return air short tube is parallel to the strip blowing mouth to, and above-mentioned several rows return air short tube and several strip blowing mouths distribute alternately; The air outlet of described electric heater unit is communicated to the air inlet of air-inlet cavity; The air outlet in described return air chamber is communicated to air exhauster.

4, energy-conserving and environment-protective coater oven according to claim 1 and 2 system, it is characterized in that: the shell of energy recovery interchanger is tubular.

5, energy-conserving and environment-protective coater oven according to claim 1 and 2 system, it is characterized in that: described gas-filtering device comprises the casing of a sealing, box house in sealing is equipped with washable screen pack, multistage washable vegetable active carbon screen pack, and low noise axial fan.

6, energy-conserving and environment-protective coater oven according to claim 1 and 2 system, it is characterized in that: described gas-filtering device is the photochemical catalyst air cleaning unit, the washable screen pack that this photochemical catalyst air cleaning unit includes the antibacterial air filter that is used to remove the bacterium in the air, be made of fibrage, is used to the deodorization filter removing the photochemical catalyst collector of trickle dust and VOC and be used to remove the volatile solvent molecule.

7, energy-conserving and environment-protective coater oven according to claim 3 system, it is characterized in that: every joint baking oven is provided with seven strip blowing mouths and 28 circular return air short tubes, article 28, circular return air short tube is arranged as seven row, and every row is provided with four circular return air short tubes.

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