Energy-saving and consumption-reducing system and method for air intake and exhaust volume of coating machine oven

Abstract

The present application belongs to the technical field of coating machine, and relates to an energy-saving and consumption-reducing system and method for the air intake and exhaust volume of a coating machine oven. The air outlet of the first zone oven and the air outlet of the second zone oven are directly connected to the RTO. The air inlet of the Nth zone oven and the air inlet of the N-1th zone oven are connected to the RTO. The air outlet of the N-1th zone oven is connected to the air inlet of the N-2th zone oven, and the exhaust air of the subsequent zone oven is used for the air intake of the previous zone oven, until the air outlet of the third zone oven is connected to the air inlet of the second zone oven, the exhaust air of the third zone oven is used for the air intake of the second zone oven. The air outlet of the Nth zone oven is connected to the air inlet of the first zone oven, and the exhaust air of the Nth zone oven is used for the air intake of the first zone oven. Through the adjustment and transformation of the coating and oven hot air system, the present application reduces the air intake and exhaust volume of the coating machine by more than 50%, greatly saves energy consumption, and solves the problem of insufficient RTO processing capacity.

Description

Technical Field

[0001] This invention belongs to the field of coating machine technology, specifically relating to an energy-saving and consumption-reducing system and method for reducing the air volume of the coating machine oven. Background Technology

[0002] Existing coating machine ovens typically use 1-5 zone ovens. In 5-zone ovens, the air intake comes from the RTO (Regenerative Thermal Oxidizer), and the exhaust air is discharged back to the RTO for further treatment. Figure 1 As shown, the air intake and exhaust volume is relatively large, resulting in high energy consumption. Therefore, while ensuring the drying efficiency and VOC treatment effect, it is necessary to address the issues of the large exhaust volume of the laser film coating machine, the severe insufficiency of the RTO processing capacity, and the coating machine's inability to exhaust properly and operate at full capacity. The solution is to modify and adjust the air intake and exhaust volume of the coating machine's oven to ensure that both the coating machine and the RTO maintain normal operation. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art and provide an energy-saving system and method for reducing the air volume of the coating machine oven, thereby solving the problems of large air volume and insufficient RTO processing capacity in existing coating machine ovens.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] In a first aspect, the present invention provides an energy-saving and consumption-reducing system for the air intake and exhaust volume of a coating machine oven, the system comprising N ovens connected in sequence, where N is five or six;

[0006] The air outlets of the first and second zone ovens are direct exhaust air and are connected to the RTO respectively; the air inlets of the Nth and N-1th zone ovens are connected to the RTO, so that the hot air from the RTO enters the Nth and N-1th zone ovens respectively.

[0007] The air outlet of the (N-1)th zone oven is connected to the air inlet of the (N-2)th zone oven. The exhaust air from the (N-1)th zone oven is used to supply the air intake of the (N-2)th zone oven. This process continues until the air outlet of the third zone oven is connected to the air inlet of the second zone oven. The exhaust air from the third zone oven is used to supply the air intake of the second zone oven. The air outlet of the Nth zone oven is connected to the air inlet of the first zone oven. The exhaust air from the Nth zone oven is used to supply the air intake of the first zone oven.

[0008] Preferably, the system comprises five ovens connected in sequence.

[0009] Preferably, the heating temperatures of the fourth, third, second, and first drying ovens decrease sequentially; the heating temperature of the fifth drying oven is 20-30°C higher than that of the first drying oven.

[0010] Preferably, the air velocity at the air inlet of the first zone oven and the air inlet of the fifth zone oven are both 2.0-2.5 m / s; the air velocity at the air inlet of the second zone oven, the third zone oven and the fourth zone oven is 2.5-3.5 m / s.

[0011] Preferably, the air inlet of the first zone oven is connected to a first zone air intake fan, and the air outlet of the first zone oven is connected to a first zone exhaust fan; the air inlet of the second zone oven is connected to a second zone air intake fan, and the air outlet of the second zone oven is connected to a second zone exhaust fan; the air inlet of the third zone oven is equipped with a third zone air intake fan; the air inlet of the fourth zone oven is equipped with a fourth zone air intake fan; and the air inlet of the fifth zone oven is equipped with a fifth zone air intake fan.

[0012] Preferably, the air outlet of the third zone oven is connected to a third row of fans, the air outlet of the fourth zone oven is connected to a fourth row of fans, and the air outlet of the fifth zone oven is connected to a fifth zone exhaust fan.

[0013] Preferably, the first zone oven is equipped with a first zone heater at its air inlet; the second zone oven is equipped with a second zone heater at its air inlet; the third zone oven is equipped with a third zone heater at its air inlet; the fourth zone oven is equipped with a fourth zone heater at its air inlet; and the fifth zone oven is equipped with a fifth zone heater at its air inlet.

[0014] Preferably, the air inlet of the first zone oven is provided with a first zone filter; the air inlet of the second zone oven is provided with a second zone filter; the air inlet of the third zone oven is provided with a third zone filter; the air inlet of the fourth zone oven is provided with a fourth zone filter; and the air inlet of the fifth zone oven is provided with a fifth zone filter.

[0015] Secondly, the present invention provides a method for saving energy and reducing consumption of the air intake and exhaust volume of a coating machine oven, the method being as follows:

[0016] The air outlets of the first and second zone ovens are set to direct exhaust and connected to the RTO respectively; the air inlets of the fifth and fourth zone ovens are connected to the RTO so that the hot air from the RTO enters the fifth and fourth zone ovens respectively.

[0017] Connect the air outlet of the fourth zone oven to the air inlet of the third zone oven, connect the air outlet of the third zone oven to the air inlet of the second zone oven, and connect the air outlet of the fifth zone oven to the air inlet of the first zone oven.

[0018] The temperatures of the fourth, third, second, and first drying ovens are set to decrease sequentially. The temperature of the fifth drying oven is 20-30°C higher than that of the first drying oven, and lower than that of the fourth drying oven.

[0019] The air velocity at the air inlet of the first and fifth zone ovens is set at 2.0-2.5 m / s; the air velocity at the air inlet of the second, third, and fourth zone ovens is set at 2.5-3.5 m / s.

[0020] Thirdly, the present invention provides an energy-saving and consumption-reducing system for the air intake and exhaust volume of a coating machine oven. The system includes seven ovens connected in sequence. The air outlets of the first, second, and third ovens are direct exhaust air and are respectively connected to the RTO. The air inlets of the second, sixth, and seventh ovens are connected to the RTO, so that the hot air from the RTO enters the second, sixth, and seventh ovens respectively.

[0021] The air outlet of the sixth zone oven is connected to the air inlet of the fifth zone oven, using the exhaust air from the sixth zone oven to supply the air intake of the fifth zone oven; the air outlet of the fifth zone oven is connected to the air inlet of the fourth zone oven, using the exhaust air from the fifth zone oven to supply the air intake of the fourth zone oven; the air outlet of the fourth zone oven is connected to the air inlet of the third zone oven, using the exhaust air from the fourth zone oven to supply the air intake of the third zone oven; the air outlet of the seventh zone oven is connected to the air inlet of the first zone oven, using the exhaust air from the seventh zone oven to supply the air intake of the first zone oven.

[0022] This invention has the following beneficial effects: 1. When operating a five-zone drying oven normally, the exhaust air from zone four is adjusted to be entirely directed to the intake air from zone three, and the exhaust air from zone three is entirely directed to the intake air from zone two (the exhaust doors of zones four and three are completely closed, and the exhaust air from zones four and three is fully opened to the intake doors of the preceding zones respectively). Except for the first and second zones where the circulating air is completely closed, the circulating air in zones three to five is appropriately opened; through the adjustment and modification of the coating hot air system, the intake and exhaust air volume of the coating machine is reduced by more than 50%, which greatly saves energy consumption and also solves the problem of insufficient RTO processing capacity; since the amount of hot air used by the RTO is reduced, energy consumption is correspondingly saved.

[0023] 2. This patented technology solves the problems of high energy consumption and large air intake and exhaust volume in the oven of PET laser film coating machine; and the problem of insufficient RTO processing capacity.

[0024] 3. This patented technology is applicable to reducing the intake and exhaust air volume of ovens in coating machines other than PET laser film coating machines, so as to achieve energy saving and consumption reduction, and solve the problem of insufficient RTO processing capacity. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the original coating machine drying oven air duct connection;

[0026] Figure 2 This is a schematic diagram of the air duct connection for the coating machine drying oven of the present invention;

[0027] Figure 3This is a schematic diagram of the pipeline connection and related parameter adjustment for the energy-saving renovation of the hot air system of the coating machine according to the present invention. Detailed Implementation

[0028] The present invention will be further described below with reference to embodiments, but these embodiments are not intended to limit the scope of the invention.

[0029] An energy-saving and consumption-reducing system for the air intake and exhaust of a coating machine oven, the system comprising seven ovens connected in sequence; the air outlets of the first, second, and third ovens are direct exhaust air, respectively connected to an RTO (Regenerative Thermal Oxidizer); the air inlets of the second, sixth, and seventh ovens are connected to the RTO, allowing hot air from the RTO to enter the second, sixth, and seventh ovens respectively; the air outlet of the sixth oven is connected to the fifth oven... The air inlets of the ovens are connected, and the exhaust air from the sixth zone oven is used to supply the air intake of the fifth zone oven; the air outlet of the fifth zone oven is connected to the air inlet of the fourth zone oven, and the exhaust air from the fifth zone oven is used to supply the air intake of the fourth zone oven; the air outlet of the fourth zone oven is connected to the air inlet of the third zone oven, and the exhaust air from the fourth zone oven is used to supply the air intake of the third zone oven; the air outlet of the seventh zone oven is connected to the air inlet of the first zone oven, and the exhaust air from the seventh zone oven is used to supply the air intake of the first zone oven.

[0030] An energy-saving and consumption-reducing system for the air intake and exhaust of a coating machine oven includes N ovens connected in sequence, where N is five or six; the air outlets of the first and second ovens are direct exhausts, respectively connected to an RTO (Regenerative Thermal Oxidizer); the air inlets of the Nth and N-1th ovens are connected to the RTO, allowing hot air from the RTO to enter the Nth and N-1th ovens respectively; the air outlet of the N-1th oven is connected to the air inlet of the N-2th oven, using the exhaust air from the N-1th oven to supply the air intake of the N-2th oven, and so on, using the exhaust air from the next oven to supply the air intake of the previous oven, until the air outlet of the third oven is connected to the air inlet of the second oven, using the exhaust air from the third oven to supply the air intake of the second oven; the air outlet of the Nth oven is connected to the air inlet of the first oven, using the exhaust air from the Nth oven to supply the air intake of the first oven.

[0031] An energy-saving system and method for reducing the air intake and exhaust volume of a coating machine oven, comprising a first zone oven, a second zone oven, a third zone oven, a fourth zone oven, and a fifth zone oven;

[0032] The top of the first zone oven is equipped with an air inlet, and the air inlet is equipped with a first zone filter screen. The air inlet of the first zone oven is connected to the first zone heater and the first zone air blower in sequence through pipes. The bottom of the first zone oven is equipped with an air outlet, which is connected to the first zone exhaust fan through pipes.

[0033] The top of the second zone oven is equipped with an air inlet, and a second filter screen is installed at the air inlet. The air inlet of the second zone oven is connected to the second zone heater and the second zone air intake fan in sequence through pipes. The bottom of the second zone oven is equipped with an air outlet, which is connected to the second zone exhaust fan through pipes.

[0034] The top of the third zone oven is equipped with an air inlet, and a third filter screen is installed at the air inlet. The air inlet of the third zone oven is connected to the third zone heater and the third zone air intake fan in sequence through pipelines. The bottom of the third zone oven is equipped with an air outlet, which is connected to the third zone exhaust fan through pipelines.

[0035] The top of the fourth zone oven is equipped with an air inlet, and a fourth filter screen is installed at the air inlet. The air inlet of the fourth zone oven is connected to the fourth zone heater and the fourth zone air blower in sequence through pipes. The bottom of the fourth zone oven is equipped with an air outlet, which is connected to an exhaust fan through pipes.

[0036] The top of the fifth zone oven is equipped with an air inlet, and a fifth filter screen is installed at the air inlet. The air inlet of the fifth zone oven is connected to the fifth zone heater and the fifth zone air blower in sequence through pipes. The bottom of the fifth zone oven is equipped with an exhaust port, which is connected to an exhaust fan through pipes.

[0037] The air inlet fans of the fifth zone oven and the fourth zone oven are connected to the RTO via pipelines, allowing the RTO hot air to enter the fifth and fourth zone ovens respectively. The volatile gas emissions of the fourth and fifth zone ovens are the lowest and can be recycled. The temperature of the fourth zone oven is set to the highest, and the temperature of the third, second, and first zone ovens decreases in a gradient, with the temperature of the ovens decreasing as they move forward. The exhaust air of the fourth zone oven is used to supply the air intake of the previous zone oven, and the exhaust air of the third zone oven is used to supply the air intake of the previous zone oven.

[0038] The exhaust fan at the outlet of the fourth zone oven is connected to the inlet fan at the inlet of the third zone oven via a pipeline, so that the exhaust air from the fourth zone oven is used to supply the air intake of the third zone oven; the exhaust fan at the outlet of the third zone oven is connected to the inlet fan at the inlet of the second zone oven via a pipeline, so that the exhaust air from the third zone oven is used to supply the air intake of the second zone oven.

[0039] Set the airflow of the fifth zone oven to be the same as that of the first zone oven (the nozzle velocity at the air inlet of the fifth zone oven and the air inlet of the first zone oven are both 2.0-2.5 m / s). Set the nozzle velocity at the air inlet of the middle zones (the nozzle velocities at the air inlets of the second, third, and fourth zones are 2.5-3.5 m / s). Set the temperature of the fifth zone oven to be 20-30℃ higher than that of the first zone oven. Connect the fifth zone exhaust fan at the air outlet of the fifth zone oven to the first zone intake fan at the air inlet of the first zone oven via a management system. Set the first and second zone ovens to direct exhaust.

[0040] This changes the air intake and exhaust configuration of the coating machine's ovens from the original "five inlets and five outlets" to "two inlets and two outlets." Instead of each pair of ovens having their intake air connected to the RTO (Regenerative Thermal Oxidizer) and each oven's exhaust air connected to the RTO, now only the first and second ovens exhaust air to the RTO. The intake and exhaust air from the other ovens are recycled (e.g., ...). Figure 2 (As shown).

[0041] The coating machine oven has upper and lower exhaust ducts. The upper exhaust duct connects to the upper part of the coating head hood, and the lower exhaust duct connects to the lower part of the coating head. These respectively remove volatile waste gas from the upper part of the coating head and accumulated waste gas from the lower part, preventing high concentrations of waste gas at the coating head that could be unsafe or negatively impact the operating environment. Both the upper and lower exhaust ducts have adjustable dampers to control the exhaust volume and are connected to the head exhaust fan. For example, the head exhaust fan frequency is set to 20Hz, the upper exhaust damper opening is 45%, and the lower exhaust damper opening is 15%. (Adjustments may vary depending on the manufacturer; ensure a slight negative pressure inside the upper exhaust hood and that there is no noticeable odor in the coating head operating space.)

[0042] Table 1 shows the frequency converter of the fan and the opening of the damper for the energy-saving connection of the air inlet and outlet of the coating oven.

[0043] The function of the cold air damper is to adjust and lower the inlet air temperature when the fresh air inlet temperature is higher than the set value, thus ensuring that the oven temperature remains stable at the set value. Another function is to appropriately open the cold air damper to supplement air when the RTO hot air intake is insufficient.

[0044] The purpose of variable frequency drives (VFDs) for intake and exhaust is to maximize the opening of the intake and exhaust dampers, adjusting the airflow by regulating the fan speed through the VFD, rather than adjusting the dampers while the fan is running at full power. The primary use of VFD control for fans is energy saving; those skilled in the art can make a conventional selection based on their needs.

[0045] The oven temperatures in the low-temperature zones (Zones 1, 2, and 5) are not very high. Additionally, the solvent concentration in the exhaust air from Zones 1 and 2 is relatively high, making recirculation of the exhaust air unsuitable; therefore, the recirculation dampers are fully closed. The oven temperatures in the high-temperature zones (Zones 3 and 4) are relatively high, and the solvent concentration in the exhaust air is relatively low, making recirculation of the exhaust air suitable; therefore, the recirculation dampers are partially open.

[0046] Table 1. Energy-saving connection methods for inlet and outlet air of coating oven, including fan frequency conversion and damper opening.

[0047]

[0048] The air intake and exhaust volume test results of the energy-saving connection method of the coating oven are shown in Table 2.

[0049] Table 2. Airflow Measurement Results for Energy-Saving Connections of Coating Oven Inlet and Exhaust.

[0050]

[0051]

[0052] Example 1

[0053] The coating machine ovens are connected as follows: the air inlets of the fifth and fourth zones are connected to the RTO hot air; the exhaust from the fourth zone oven supplies the air inlet to the third zone oven; the exhaust from the third zone oven supplies the air inlet to the second zone oven; the exhaust from the fifth zone oven supplies the air inlet to the first zone oven; and the first and second zone ovens exhaust air directly to the RTO.

[0054] Set the oven temperature to 75℃ for the first zone, 105℃ for the second zone, 140℃ for the third zone, 150℃ for the fourth zone, and 105℃ for the fifth zone.

[0055] The test conditions were as follows: the coated film size was 13.8u*1510mm*3000m, the coating material was gravure laser coating, the RTO hot air temperature was 120℃, and the coating machine speed was 110m / min.

[0056] Example 2

[0057] Compared with Example 1, the oven temperature in the first zone is 75°C, the oven temperature in the second zone is 105°C, the oven temperature in the third zone is 140°C, the oven temperature in the fourth zone is 150°C, and the oven temperature in the fifth zone is 100°C.

[0058] Example 3

[0059] Compared to Example 1, the scale-up test was 19200m.

[0060] Example 4

[0061] Compared with Example 1, the oven temperature in the first zone is set to 80°C, the oven temperature in the second zone is set to 105°C, the oven temperature in the third zone is set to 125°C, the oven temperature in the fourth zone is set to 135°C, and the oven temperature in the fifth zone is set to 105°C.

[0062] The test conditions were as follows: the coated film size was 13.8u*1400mm*19200m (15 rolls coated), the coating material was offset laser coating, the RTO hot air temperature was 120℃, and the coating machine speed was 120m / min.

[0063] Example 5

[0064] Compared with Example 4, the test conditions were as follows: the coating film size was 13.8u*1400mm*19200m (6 rolls of coating), the coating material was offset laser coating, the RTO hot air temperature was 120℃, and the coating machine speed was 120m / min.

[0065] Example 6

[0066] Compared with Example 4, the test conditions were as follows: the coating film size was 13.8u*1580mm*19200m (5 rolls of coating), the coating material was offset laser coating, the RTO hot air temperature was 120℃, and the coating machine speed was 120m / min.

[0067] Example 7

[0068] Compared with Example 1, the oven temperature in the first zone is set to 80°C, the oven temperature in the second zone is set to 105°C, the oven temperature in the third zone is set to 125°C, the oven temperature in the fourth zone is set to 140°C, and the oven temperature in the fifth zone is set to 105°C.

[0069] The test conditions were as follows: the coating film size was 16u*775mm*12600m (12 rolls of coating), the coating material was composite laser coating, the RTO hot air temperature was 120℃, and the coating machine speed was 120m / min.

[0070] Comparative Example 1

[0071] Compared with Example 3, the oven temperature in the first zone is set to 80°C, the oven temperature in the second zone is set to 110°C, the oven temperature in the third zone is set to 130°C, the oven temperature in the fourth zone is set to 140°C, and the oven temperature in the fifth zone is set to 95°C.

[0072] Comparative Example 2

[0073] Compared with Example 1, the connection method of the coating machine oven is as follows: the air inlet of the fifth zone oven is connected to the RTO hot air, the exhaust air of the fifth zone oven is supplied to the fourth zone oven, the exhaust air of the fourth zone oven is supplied to the third zone oven, the exhaust air of the third zone oven is supplied to the second zone oven, and the second zone oven and the first zone oven are directly exhausted to the RTO.

[0074] Comparative Example 3

[0075] Compared with Example 1, the connection method of the coating machine oven is as follows: the air inlet of the fifth zone oven is connected to the RTO hot air, the exhaust air of the fifth zone oven is supplied to the fourth zone oven, the exhaust air of the fourth zone oven is supplied to the third zone oven, and the third zone oven, the second zone oven, and the first zone oven directly exhaust air to the RTO.

[0076] Comparative Example 4

[0077] Compared with Example 1, the connection method of the coating machine oven is as follows: the air inlet of the fifth zone oven and the air inlet of the fourth zone oven are connected to the RTO hot air, the exhaust air of the fourth zone oven is supplied to the air inlet of the third zone oven, the exhaust air of the third zone oven is supplied to the air inlet of the second zone oven, and the fifth zone oven, the second zone oven, and the first zone oven are directly exhausted to the RTO.

[0078] Comparative Example 5

[0079] Compared with Example 1, the connection method of the coating machine oven is to connect the air inlets of the fifth zone oven, the fourth zone oven, the third zone oven, the second zone oven, and the first zone oven to the RTO hot air, and directly exhaust the air from the air inlets of the fifth zone oven, the fourth zone oven, the third zone oven, the second zone oven, and the first zone oven to the RTO.

[0080] The analytical results of Examples 1-7 and Comparative Examples 1-5 are shown in Table 3;

[0081] Table 3 Analysis Results

[0082]

[0083]

[0084] All the above tests were conducted using a coating machine with a five-zone oven. The inlet and outlet air ducts of the ovens were adjusted in series for comparative testing. Comparative Example 5 represents the normal process. Compared with the normal process of Comparative Example 5, Comparative Examples 1 and 2-4 showed better drying efficiency and VOC detection results. However, in Comparative Examples 2 and 3, the RTO hot air entered the fifth zone oven first. The set temperature of the fifth zone oven was 105℃, but the actual temperature reached 109℃. Reducing the amount of hot air entering the RTO or lowering the temperature of the hot air entering the RTO would not achieve the goal of fully utilizing the RTO's thermal energy. Moreover, the fourth zone requires high temperature, which presents a problem of unreasonable connection. Therefore, it is advisable for the RTO hot air to enter the highest temperature zone oven, i.e., the fourth zone, and then the low temperature zone. Compared with Comparative Example 4, the drying efficiency and VOC detection results of Comparative Example 1 were similar. However, the series connection of the five-zone ovens in Comparative Example 1 can reduce the energy consumption of the coating machine and reduce the RTO's compliance.

[0085] Compared with Comparative Example 1, Examples 1 and 2 show better VOC detection results when the temperature difference between the first and fifth drying zones is 20-30℃.

[0086] Examples 4-7 illustrate the batch production testing of offset laser coatings and composite laser coatings, all of which met production quality requirements. The RTO display showed a significant reduction in the total exhaust volume of the coating machine; theoretically, this reduction should be over 50%, demonstrating a noticeable energy-saving effect. Evaluation revealed that although the series connection of inlet and exhaust ducts reduces the RTO's inlet and exhaust volume, resulting in slightly worse drying performance compared to normal duct connections, it does not affect VOCs and fully meets production quality requirements.

[0087] Taking the current equipment status of a certain company as an example: The company has built a new RTO exhaust gas treatment system (with a treatment capacity of 60,000 m3 / h) for its BOPET laser film coating equipment, and equipped it with 9 coating machines (with a normal exhaust volume of more than 90,000 m3 / h). The RTO treatment capacity is seriously insufficient, and the coating machines will have problems such as not being able to exhaust properly, not being able to operate at full capacity, and high energy consumption.

[0088] The effect of reducing the intake and exhaust air volume of coating machines on energy saving, consumption reduction and efficiency improvement:

[0089] 1) The original coating machine's air intake for each zone of the drying oven (normally five zones) came from the RTO hot air, and the exhaust air from each zone was also discharged to the RTO for treatment, i.e., 5 inlets and 5 outlets (e.g.) Figure 1 The RTO has limited processing capacity and cannot handle the exhaust gas from multiple coating machines. After the modification, the coating machine fully utilizes its own thermal energy, with exhaust air from the high-temperature zone supplying the low-temperature zone, creating a recycling system. Only the intake air of two drying zones (normally five zones) comes from the RTO hot air, and only the exhaust air from these two zones is discharged to the RTO for treatment, i.e., 2 inlets and 2 outlets (e.g., ...). Figure 2 This reduces RTO hot air by at least 50% and exhaust air discharged to the RTO by 50%, saving energy and reducing the RTO's processing capacity.

[0090] 2) Based on the overall modification of the 9 coating machines, each machine can reduce the amount of RTO hot air by 50% and the amount of exhaust air discharged to the RTO by 50%, which greatly saves energy and reduces the processing capacity of the RTO.

[0091] The estimated energy-saving and consumption-reducing benefits of reducing the RTO inlet and outlet air volume in the coating machine are as follows:

[0092] All nine coating machines are wide-width machines, and before the upgrade, the total exhaust volume of each machine was 10,000 m³. 3 The air volume is above / h (based on normal use of a five-zone drying oven, 5 inlets and 5 outlets), and the total air volume of each machine is 10,000 m³ / h. 3 / h calculation.

[0093] ① After the modification, the total intake and exhaust air volume of the RTO was reduced by 50%, which means that the volume of each coating machine was reduced by approximately 5000m³. 3 / h of RTO hot air intake. The actual hot air temperature delivered to the coating area by the RTO is approximately 90-105℃. Assuming 90℃, then 5000m 3 The amount of heat required to raise the temperature of air from 20°C (assuming an average annual temperature of 20°C) to 90°C (ignoring factors such as air movement, air pressure, and changes in the medium) can be calculated using the heat formula:

[0094] Q=5000*C*m*(t2-t1)=5000*1.003*1.29*(90-20)=452854.5kJ

[0095] Note: C—Specific heat capacity of air is 1.003 J / (kg*K)

[0096] m — The density of air is 1.29 kg / m³ 3

[0097] t1—Initial temperature of heating (°C)

[0098] t2 — Final temperature of the heating process (°C)

[0099] Converting electricity consumption to 1 kWh = 3600 kJ:

[0100] 452854.5 / 3600=125.79 degrees

[0101] That is, a coating machine reduces 5000m³ per hour 3 Air requires 125.79 kilowatt-hours of electricity to rise from its ambient temperature of 20°C to 90°C. This means that by modifying a coating machine to reduce its intake and exhaust air volume by 50%, the equivalent of 125.79 kilowatt-hours of electricity can be saved per hour.

[0102] Based on a coating machine speed of 110 m / min and double-operation, the energy consumption per 10,000 m³ is:

[0103] 125.79 / (110*60*2*10-4)=95.30 kWh / 10,000 m³

[0104] If the 9 coating machines are operating normally, and the total number of coated films per year is calculated as 3.3 * 10⁸ m / year, then the 9 coating machines can save a total of approximately 3.3 * 10⁸ * 95.3 * 10⁻⁴ = 3,144,900 kWh of energy per year.

[0105] Based on an electricity price of 0.7 yuan per kilowatt-hour, the coating workshop can save approximately [amount missing] energy per year.

[0106] 3,144,900 * 0.7 = 2,201,430 yuan

[0107] ②After the BOPET laser film coating machine was modified, the total intake and exhaust air volume of the RTO was reduced by 50%, meaning that each machine reduced its exhaust air volume to the RTO by 5000 m³ / h. However, the actual amount of waste solvent volatilized and emitted into the RTO remained unchanged, thus not affecting the oxidation process in the RTO furnace. An RTO with a processing capacity of 60,000 m³ / h can handle the exhaust air volume of 10-11 coating machines, resolving the issue of insufficient RTO processing capacity and ensuring normal production of both the coating machines and the RTO.

[0108] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. However, the above description is merely a specific embodiment of the present invention, and the technical features of the present invention are not limited thereto. Any other embodiments derived by those skilled in the art without departing from the technical solution of the present invention should be covered within the patent scope of the present invention.

Claims

1. An energy-saving and consumption-reducing system for the air inlet and outlet volume of a coating machine oven, characterized in that, The system includes five ovens connected in sequence, the five ovens being a first oven, a second oven, a third oven, a fourth oven, and a fifth oven arranged sequentially from the head to the tail of the coating machine oven; The air outlets of the first and second zone ovens are direct exhaust air and are connected to the RTO respectively; the air inlets of the fifth and fourth zone ovens are connected to the RTO, so that the hot air from the RTO enters the fifth and fourth zone ovens respectively. The air outlet of the fourth zone oven is connected to the air inlet of the third zone oven, and the exhaust air of the fourth zone oven is used to supply the air intake of the third zone oven; the air outlet of the third zone oven is connected to the air inlet of the second zone oven, and the exhaust air of the third zone oven is used to supply the air intake of the second zone oven; the air outlet of the fifth zone oven is connected to the air inlet of the first zone oven, and the exhaust air of the fifth zone oven is used to supply the air intake of the first zone oven. The heating temperatures of the fourth, third, second, and first zones of the oven decrease sequentially; the heating temperature of the fifth zone oven is 20-30°C higher than that of the first zone oven.

2. The energy-saving and consumption-reducing system for the air intake and exhaust volume of the coating machine oven according to claim 1, characterized in that, The air velocity at the air inlet of the first zone oven and the air inlet of the fifth zone oven is 2.0-2.5 m / s; the air velocity at the air inlet of the second zone oven, the third zone oven and the fourth zone oven is 2.5-3.5 m / s.

3. The energy-saving and consumption-reducing system for the air intake and exhaust volume of the coating machine oven according to claim 1, characterized in that, The air inlet of the first zone oven is connected to a first zone air intake fan, and the air outlet of the first zone oven is connected to a first zone exhaust fan; the air inlet of the second zone oven is connected to a second zone air intake fan, and the air outlet of the second zone oven is connected to a second zone exhaust fan; the air inlet of the third zone oven is equipped with a third zone air intake fan; the air inlet of the fourth zone oven is equipped with a fourth zone air intake fan; and the air inlet of the fifth zone oven is equipped with a fifth zone air intake fan.

4. The energy-saving and consumption-reducing system for the air inlet and outlet of the coating machine oven according to claim 3, characterized in that, The air outlet of the third zone oven is connected to a third exhaust fan, the air outlet of the fourth zone oven is connected to a fourth exhaust fan, and the air outlet of the fifth zone oven is connected to a fifth zone exhaust fan.

5. The energy-saving and consumption-reducing system for the air intake and exhaust volume of the coating machine oven according to claim 1, characterized in that, The first zone oven is equipped with a first zone heater at its air inlet; the second zone oven is equipped with a second zone heater at its air inlet; the third zone oven is equipped with a third zone heater at its air inlet; the fourth zone oven is equipped with a fourth zone heater at its air inlet; and the fifth zone oven is equipped with a fifth zone heater at its air inlet.

6. The energy-saving and consumption-reducing system for the air inlet and outlet of the coating machine oven according to claim 1, characterized in that, The first zone oven has a first zone filter at its air inlet; the second zone oven has a second zone filter at its air inlet; the third zone oven has a third zone filter at its air inlet; the fourth zone oven has a fourth zone filter at its air inlet; and the fifth zone oven has a fifth zone filter at its air inlet.

7. A method for saving energy and reducing consumption of the air intake and exhaust volume of a coating machine oven using the system according to any one of claims 1-6, the method being as follows: The air outlets of the first and second zone ovens are set to direct exhaust and connected to the RTO respectively; the air inlets of the fifth and fourth zone ovens are connected to the RTO so that the hot air from the RTO enters the fifth and fourth zone ovens respectively. Connect the air outlet of the fourth zone oven to the air inlet of the third zone oven, connect the air outlet of the third zone oven to the air inlet of the second zone oven, and connect the air outlet of the fifth zone oven to the air inlet of the first zone oven. The temperatures of the fourth, third, second, and first drying ovens are set to decrease sequentially. The temperature of the fifth drying oven is 20-30°C higher than that of the first drying oven, and lower than that of the fourth drying oven. The air velocity at the air inlet of the first and fifth zone ovens is set at 2.0-2.5 m / s; the air velocity at the air inlet of the second, third, and fourth zone ovens is set at 2.5-3.5 m / s.

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