Double Gas Collection Chamber Electric Heating System for Printing Press Oven

Abstract

The present invention discloses a dual air collecting chamber electric heating system for a printing press oven, which includes a large air collecting chamber, a small air collecting chamber, an oven, a first air heat exchanger and a second air heat exchanger. The output of the hot air discharged from the oven, after heat exchange, the heat energy of a part of the hot air is transferred to the fresh air, and finally the air is collected and enters the large air collecting chamber to participate in the next cycle. Another part enters the small air collecting chamber after heat exchange and is then controllably mixed with the hot air in the large air collecting chamber and sent to the oven. In this way, it can not only prevent the overall heat from being reduced due to the discharge of hot air, fundamentally saving costs and reducing energy loss, but also meet the special drying needs of individual jump-type units, further reasonably reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of printing press drying, and specifically to a double air-collecting chamber electric heating system for a printing press oven. Background Art

[0002] The drying of printed products is usually completed by an oven. Air is heated by a heating unit, sent into the air inlet of the oven and then discharged from the air outlet. The hot air discharged from the exhaust air channel of the oven not only affects the environment, but also causes a certain degree of energy waste. In addition, hot air drying equipment generally consumes a large amount of energy. Generally, the energy consumption of hot air drying accounts for more than 80% of the energy consumption of the entire printing process. A large amount of heat energy is stored in the exhaust gas discharged during the drying process, and this part of heat energy is directly discharged into the atmosphere and wasted. In addition, during the printing process, due to the possible existence of individual skip-type units between different color groups of the printing unit, the temperature of the oven needs to be increased due to problems such as printing area and ink. The requirements of the remaining units are lower. In the past designs, there was no solution to this situation, and the centralized air-collecting method was adopted, that is, the temperature of the mixed gas entering all ovens was the same temperature. In this way, the high-temperature gas discharged from the high-temperature oven was wasted, and the electric heating component needed to be reheated, wasting energy. Summary of the Invention

[0003] In order to overcome the above defects, the present invention designs a double air-collecting chamber electric heating system for a printing press oven with two air-collecting chambers of different sizes and two air heat exchangers, mainly to meet the special drying needs of individual skip-type units and reduce energy consumption.

[0004] The technical solution adopted by the present invention to achieve the above object is: a double-gas-collecting-chamber electric heating system for a printing press oven, including a large gas collecting chamber, a small gas collecting chamber, an oven, a first air heat exchanger, and a second air heat exchanger. VOCs concentration sensors, temperature sensors, and humidity sensors are installed in both the large gas collecting chamber and the small gas collecting chamber. At least one intake air path has one end connected to the large gas collecting chamber and the other end connected to the oven intake port. Each intake air path is provided with a fan, a heating unit, and a pressure relief valve. The mixed air discharged from the exhaust port of the intake air path is merged into the main return air pipeline and then divided into two paths. The mixed air is connected to the first air heat exchanger through the first return air pipeline for heat exchange, and then a part of it is discharged to the outside, and the other part is transported through the third return air pipeline and mixed with the fresh air after heat exchange through the first air heat exchanger and then sent into the large gas collecting chamber. The mixed air is connected to the second air heat exchanger through the second return air pipeline for heat exchange and then discharged to the outside. The fresh air is directly sent into the large gas collecting chamber through the first fresh air intake path. After passing through the third fresh air intake path, a part of the fresh air passes through the second air heat exchanger for heat exchange and is mixed with a part of the hot air in the first return air pipeline and then sent into the large gas collecting chamber. After passing through the third fresh air intake path, another part of the fresh air passes through the second air heat exchanger for heat exchange and is mixed with a part of the hot air in the second return air pipeline that has passed through the first air heat exchanger and then sent into the small gas collecting chamber. The hot air discharged from the small gas collecting chamber is mixed with the hot air in the corresponding intake air path and then sent into the intake port of the oven. The fresh air is directly sent into the small gas collecting chamber through the second fresh air intake path. The oven is provided with one intake port and two exhaust ports.

[0005] The beneficial effects of the present invention are: for the output of the hot air discharged from the oven, after heat exchange, the heat energy of a part of the hot air is transferred to the fresh air, and finally the air is aggregated and enters the large gas collecting chamber to participate in the next cycle. Another part enters the small gas collecting chamber after heat exchange and is then controllably mixed with the hot air in the large gas collecting chamber and sent into the oven. In this way, the overall heat will not be reduced due to the discharge of hot air, fundamentally saving costs and reducing energy consumption. It can also meet the special drying needs of individual jump-type units and further reasonably reduce energy consumption. Description of the Drawings

[0006] Figure 1 It is a structural diagram of the electric heating system.

[0007] Figure 2 It is a structural diagram of the oven intake port and exhaust ports. Detailed Embodiments

[0008] The following further explains and illustrates the present invention in conjunction with specific embodiments.

[0009] As Figure 1-2 shown, the double-gas-collecting-chamber electric heating system for a printing press oven includes a large gas collecting chamber 1, a small gas collecting chamber 2, an oven 3, a first air heat exchanger 4, and a second air heat exchanger 5.

[0010] An air inlet 301 and two exhaust outlets 302 are provided on the oven.

[0011] VOCs concentration sensors, temperature sensors 7 and humidity sensors 8 are installed in both the large air collecting chamber 1 and the small air collecting chamber 2;

[0012] One end of the 4 intake air paths ⑥ is connected to the large air collecting chamber 1, and the other end is connected to the air inlet 301 of the oven 3. A fan 9, a heating unit 10 and a pressure relief valve 11 are provided on each intake air path ⑥; A air volume regulating valve 13 and an air volume detector 12 are also provided in the system.

[0013] The mixed air discharged from the exhaust outlet 302 of the oven is merged into the main return air pipeline and then divided into two paths: The mixed air is connected to the first air heat exchanger 4 through the first return air pipeline ①. After heat exchange, a part is discharged to the outside, and the other part is transported through the third return air pipeline ⑦ and mixed with the fresh air after heat exchange by the first air heat exchanger 4 and then sent into the large air collecting chamber 1; The mixed air is connected to the second air heat exchanger 5 through the second return air pipeline ②. After heat exchange, a part is discharged to the outside, and the other part is transported through the fourth return air pipeline ⑧ and mixed with the fresh air after heat exchange by the second air heat exchanger 5 and then sent into the small air collecting chamber 2;

[0014] The fresh air is sent in three paths: The fresh air is directly sent into the large air collecting chamber 1 through the first fresh air intake path ③. After passing through the third fresh air intake path ⑤, a part of the fresh air is heat-exchanged by the second air heat exchanger 5 and then mixed with a part of the hot air after heat exchange by the first air heat exchanger 4 in the first return air pipeline ① and then sent into the large air collecting chamber 1; After passing through the third fresh air intake path ⑤, another part of the fresh air is heat-exchanged by the second air heat exchanger 5 and then mixed with a part of the hot air after heat exchange by the second air heat exchanger 5 in the second return air pipeline ② and then sent into the small air collecting chamber 2. The hot air discharged from the small air collecting chamber 2 is mixed with the hot air in the corresponding intake air path ⑥ and then sent into the air inlet 301 of the oven 3; The fresh air is directly sent into the small air collecting chamber 2 through the second fresh air intake path ④.

[0015] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. Double air collection chamber electric heating system for printing press oven, Characterized in that, It includes a large air collection chamber, a small air collection chamber, an oven, a first air heat exchanger and a second air heat exchanger, VOCs concentration sensors, temperature sensors and humidity sensors are installed in both the large air collection chamber and the small air collection chamber; At least one intake air path has one end connected to the large air collection chamber and the other end connected to the oven intake port. Each intake air path is provided with a fan, a heating unit and a pressure relief valve. The mixed air discharged from the oven exhaust port is merged into the main return air pipeline and then divided into two paths. The mixed air is connected to the first air heat exchanger through the first return air pipeline. After heat exchange, part of it is discharged to the outside, and the other part is transported through the third return air pipeline and mixed with the fresh air after heat exchange through the first air heat exchanger and then sent into the large air collection chamber. The mixed air is connected to the second air heat exchanger through the second return air pipeline. After heat exchange, part of it is discharged to the outside, and the other part is transported through the fourth return air pipeline and mixed with the fresh air after heat exchange through the second air heat exchanger and then sent into the small air collection chamber; Fresh air is directly sent into the large air collection chamber through the first fresh air intake path. After passing through the third fresh air intake path, part of the fresh air is heat-exchanged through the second air heat exchanger and then mixed with part of the hot air after heat exchange through the first air heat exchanger in the first return air pipeline and then sent into the large air collection chamber; After passing through the third fresh air intake path, the other part of the fresh air is heat-exchanged through the second air heat exchanger and then mixed with part of the hot air after heat exchange through the second air heat exchanger in the second return air pipeline and then sent into the small air collection chamber. The hot air discharged from the small air collection chamber is mixed with the hot air in the corresponding intake air path and then sent into the oven intake port.

2. The double air collection chamber electric heating system for printing press oven according to claim 1, Characterized in that, Fresh air is directly sent into the small air collection chamber through the second fresh air intake path.

3. The double air collection chamber electric heating system for printing press oven according to claim 1, Characterized in that The oven is provided with one intake port and two exhaust ports.

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