Film cooling system and method with cooling air concentration and reduction function

Abstract

The invention discloses a film cooling system and method with a cooling air concentration reduction function, and belongs to the technical field of energy conservation and environmental protection, the cooling system comprises a film cooling machine, the interior of a box body of the film cooling machine is divided into one or more sealed cooling units through an isolation air curtain flexible sealing module in the film advancing direction, and the film cooling machine is connected with the isolation air curtain flexible sealing module. The cooling unit is communicated with the vaporization phase-change enhanced cooling module and the cooling air circulation discharging module; and after the vaporization phase-change enhanced cooling module wets the surface of the film, cooling air provided by the cooling air circulation discharging module is used for blow-drying and evaporating liquid drops on the surface of the film so as to realize cooling. On the premise that the cooling performance of the film cooler is not reduced, the cooling air flow and the discharge air flow can be effectively reduced, meanwhile, the concentration of pollutants in the discharge air can be increased, and follow-up treatment is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to a film cooling system and method with cooling air concentration reduction function, belonging to the technical field of energy saving and environmental protection. BACKGROUND

[0002] The rubber industry generally uses air-cooled film cooling machine to cool the rubber film pressed out by the rubber sheeting press, and the cooling air is provided by the axial flow blower on the side or top. The flow rate of a single axial flow blower is 4000-8000 m3 / h, and the number of blowers is between 8 and 60. Although some cooling equipment uses fan grouping start, frequency conversion and other ways to realize air volume regulation to adapt to the cooling demand of the rubber film and the production speed, but since the current rubber film cooling equipment is basically an open system, and the workshop exhaust system cannot collect the exhaust air of more than 100,000 m3 / h from a single rubber film cooling machine, therefore, most of the cooling air is discharged without organization in the workshop, contributing to volatile organic compounds VOCs (volatile organic compounds) in the workshop. In addition, the concentration of organic pollutants carried by the cooling air is low, and when using conventional adsorption concentration process, the adsorption effect may not be ideal due to the low adsorption partial pressure, or the equipment investment and operation cost may be too high due to the large air volume. At present, the end-of-pipe treatment technology for medium and high concentration VOCs is relatively mature, but the treatment technology that can adapt to the large air volume and low concentration of waste gas from the rubber film cooling machine is difficult to implement due to investment and operation cost. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defects of the prior art, provide a film cooling system and method with cooling air concentration reduction function, which can effectively reduce the cooling air flow rate without reducing the cooling performance of the film cooling machine; further, provide a film cooling system and method with cooling air concentration reduction function, which can improve the pollutant concentration in the exhaust air and facilitate subsequent treatment.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is:

[0005] In a first aspect, the present application provides a film cooling system with cooling air concentration reduction function, comprising a film cooling machine, the box body of the film cooling machine is divided into one or several sealed cooling units along the advancing direction of the film by a flexible sealing module with a separation air curtain, the cooling unit is in communication with a vaporization phase change enhanced cooling module and a cooling air circulation and exhaust module, the vaporization phase change enhanced cooling module wets the surface of the film, and then blows and evaporates the liquid drops on the surface of the film to achieve cooling by using the cooling air provided by the cooling air circulation and exhaust module.

[0006] The cooling air circulation exhaust module comprises a circulating air pipeline in communication with one end of a cooling air inlet pipeline and a cooling air outlet pipeline respectively, the other end of the cooling air inlet pipeline and the other end of the cooling air outlet pipeline are in communication with an air inlet and an air outlet of the cooling unit respectively, a circulating air fan is arranged on the cooling air inlet pipeline to provide circulating air power, the air outlet end of the cooling air outlet pipeline is in communication with the exhaust fan through an exhaust air pipeline, and the air inlet end of the cooling air inlet pipeline is in communication with the fresh air supplement fan through a fresh air supplement pipeline.

[0007] The relative humidity of the exhaust air in the exhaust air pipeline is controlled to be between 40% and 70%, and the ratio of the circulating air volume in the circulating air pipeline to the exhaust air volume in the exhaust air pipeline ranges from 2 to 4.

[0008] The arrangement mode of the cooling air inlet pipeline and the cooling air outlet pipeline on the film cooling machine includes same-side arrangement and opposite-side arrangement.

[0009] The average wind speed of the cooling air inlet pipeline acting on the film surface is greater than 3 m / s.

[0010] The vaporization phase change enhanced cooling module comprises a superfine atomization pump group, the inlet of the superfine atomization pump group is connected with a process water or industrial water source, the outlet is connected with a superfine atomization distribution pipeline, the superfine atomization distribution pipeline is connected with a spray vaporization unit in sections, and the spray vaporization unit is arranged inside the box body of the film cooling machine and along the circumference of the box body.

[0011] The vaporization phase change enhanced cooling module uses superfine atomized droplets as the vaporization working medium, and the atomization mode includes pressure atomization and ultrasonic atomization.

[0012] A plurality of spray vaporization units can be arranged at an increasing interval or a decreasing water amount along the advancing direction of the film.

[0013] The isolation air curtain flexible sealing module comprises a high-pressure isolation fan, the high-pressure isolation fan is in communication with a plurality of isolation air curtains through an isolation air supply pipeline, the isolation air curtains are located in the box body of the film cooling machine and are used for sealing both sides of the air inlet and outlet of the cooling unit.

[0014] In a second aspect, the application provides a film cooling method with a cooling air concentration and reduction function, based on the film cooling system with a cooling air concentration and reduction function, comprising the following steps:

[0015] The film advances in the film cooling machine, and first enters the cooling unit separated by the isolation air curtain flexible sealing module;

[0016] The vaporization phase change enhanced cooling module wets the surface of the film, and the film continues to move forward. The cooling air circulation exhaust module blows dry and evaporates the surface droplets of the film to cool it down, realizing a single wet-dry alternation process.

[0017] After completing the cooling process of one cooling unit, the film continues to the next cooling unit, repeating the wet-dry alternation process. After passing through all the cooling units, the cooled film comes out of the film cooling machine.

[0018] The beneficial effects of this invention are as follows: This invention provides a film cooling system and method with cooling air concentration and volume reduction function. By optimizing the source of the cooling equipment, the film cooler's housing is divided into one or more sealed cooling units along the film's forward direction by a flexible sealing module with an isolation air curtain. The cooling units are connected to a vaporization phase change enhanced cooling module and a cooling air circulation exhaust module. After the vaporization phase change enhanced cooling module wets the film surface, it uses the cooling air provided by the cooling air circulation exhaust module to dry the droplets on the film surface. The vaporization and evaporation of the droplets remove heat from the film surface, achieving efficient heat transfer and cooling. In this case, vaporization phase change enhanced cooling replaces traditional high-flow-rate air cooling as the main cooling method. The cooling air is mainly used to provide the necessary wind speed and unsaturated gas required for droplet vaporization. At the same time, the cooling air itself also has a certain air cooling function. Since the cooling function is mainly based on vaporization phase change enhanced cooling with higher heat transfer performance, the cooling air flow rate can be effectively reduced without reducing the cooling performance of the film cooler.

[0019] In addition, the cooling air circulation exhaust module of this invention includes a circulation air duct. The circulation air duct is connected to one end of the cooling air inlet duct and the cooling air outlet duct, respectively. The other end of the cooling air inlet duct and the other end of the cooling air outlet duct are connected to the air inlet and air outlet of the cooling unit, respectively. A circulation fan that provides circulation air power is installed on the cooling air inlet duct. The air outlet end of the cooling air outlet duct is connected to the exhaust fan through the exhaust air duct. The air inlet end of the cooling air inlet duct is connected to the fresh air makeup fan through the fresh air makeup duct. By adding the cooling air circulation function, the exhaust air flow can be further compressed, the pollutant concentration in the exhaust air can be increased, and the concentration and reduction of pollutants can be achieved, which facilitates subsequent treatment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the film cooling system with the inlet and outlet air arranged on the same side according to the present invention;

[0021] Figure 2 This is a schematic diagram of the film cooling system with the inlet and outlet air arranged on opposite sides according to the present invention.

[0022] Figure 3 This is a schematic diagram of the cooling air circulation, concentration, reduction, and exhaust module in this invention.

[0023] Figure 4 This is a schematic diagram of the vaporization phase change enhanced cooling module structure in this invention;

[0024] Figure 5 This is a schematic diagram of the flexible sealing module structure of the isolation air curtain in this invention;

[0025] The attached diagram is labeled as follows: 1-1-Circulating air duct; 1-2-Cooling air inlet duct; 1-3-Circulating air fan; 1-4-Fresh air supply duct; 1-5-Fresh air supply fan; 1-6-Cooling air outlet duct; 1-7-Exhaust air duct; 1-8-Exhaust fan; 2-1-Ultra-fine atomizing pump set; 2-2-Ultra-fine atomizing distribution duct; 2-3-Spray vaporization unit; 3-1-High-pressure isolation fan; 3-2-Isolation air supply duct; 3-3-Isolation air curtain. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, this invention discloses a film cooling system with cooling air concentration and reduction function, including a film cooler, an isolation air curtain flexible sealing module, a vaporization phase change enhanced cooling module, and a cooling air circulation exhaust module. The cooling air circulation exhaust module is located outside the housing of the film cooler and is used to circulate the cooling air. The vaporization phase change enhanced cooling module provides the ultrafine atomized droplets required for vaporization phase change cooling. The isolation air curtain flexible sealing module physically isolates the end of the cooling section of the film cooler to prevent air leakage during circulation.

[0029] The interior of the film cooler is divided into one or more sealed cooling units along the direction of film advance by a flexible sealing module with an isolation air curtain. The cooling units are connected to the vaporization phase change enhanced cooling module and the cooling air circulation exhaust module. After the vaporization phase change enhanced cooling module wets the film surface, the cooling air provided by the cooling air circulation exhaust module dries and evaporates the droplets on the film surface to achieve cooling.

[0030] The working process of the present application is as follows: the film advances in the film cooling machine, first enters the cooling unit separated by the flexible sealing module of the isolation air curtain, and the flexible sealing module of the isolation air curtain avoids cooling air leakage; the film is surface-wetted by the vaporization phase change enhanced cooling module, the film continues to advance, the cooling air circulation exhaust module is used to blow and evaporate the surface liquid drops of the film to achieve a single wet-dry alternating process; after completing the cooling process of one cooling unit, the film continues to advance to the next cooling unit, and the wet-dry alternating process is repeated, and after passing through all the cooling units, the film that is cooled and completely dried comes out of the film cooling machine.

[0031] The present application plays a combined role through the three modules of the flexible sealing module of the isolation air curtain, the vaporization phase change enhanced cooling module and the cooling air circulation exhaust module. Since the cooling function is mainly based on vaporization phase change enhanced cooling, under the premise of not reducing the cooling performance of the film cooling machine, the large amount of cooling air and exhaust air is reduced, and the concentration of pollutants in the exhaust air is concentrated, so that the economic air volume and pollutant concentration that can be treated by the end-of-pipe treatment facility are reached.

[0032] Embodiment 2

[0033] As shown in Figures 1 to 3 The present embodiment discloses a specific structure of a film cooling system based on embodiment 1, and specifically includes the following contents:

[0034] The cooling air circulation exhaust module includes a circulating air pipeline 1-1, a cooling air inlet pipeline 1-2, a circulating air fan 1-3, a fresh air supplement pipeline 1-4, a fresh air supplement fan 1-5, a cooling air outlet pipeline 1-6, an exhaust air pipeline 1-7 and an exhaust air fan 1-8. The circulating air pipeline 1-1 is in communication with one end of the cooling air inlet pipeline 1-2 and the cooling air outlet pipeline 1-6, respectively, the other end of the cooling air inlet pipeline 1-2 and the other end of the cooling air outlet pipeline 1-6 are in communication with the air inlet and the air outlet of the cooling unit, respectively, the circulating air fan 1-3 is arranged on the cooling air inlet pipeline 1-2 to provide circulating air power, the exhaust air pipeline 1-7 is in communication between the air outlet end of the cooling air outlet pipeline 1-6 and the exhaust air fan 1-8, and the fresh air supplement pipeline 1-4 is in communication between the air inlet end of the cooling air inlet pipeline 1-2 and the fresh air supplement fan 1-5. The present application improves the one-way entry and exit of cooling air to be used in circulation, that is, 60-80% of the cooling air after heat exchange with the film is returned to the cooling air inlet for circulation, and the remaining 20-40% of the air volume is used for exhaust and supplement of an equal amount of fresh air, which can greatly reduce the unorganized exhaust air volume containing low-concentration VOCs by more than 60%.

[0035] In this invention, the cooling air inlet pipe 1-2 and the cooling air outlet pipe 1-6 are arranged on the film cooler in two ways: on the same side and on opposite sides. Specifically, the same-side arrangement means that the cooling air inlet pipe 1-2 and the cooling air outlet pipe 1-6 are on one side of the film cooler, such as... Figure 1 As shown, cooling air enters the film cooler through cooling air inlet pipe 1-2 and circulating fan 1-3, while the outlet is on the other side of the film cooler. After exiting the film cooler, the cooling air enters the next process through cooling air outlet pipe 1-6. The same-side arrangement effectively divides the film cooler cooling section into two parts, separated by an isolation air curtain 3-3. On one side of the film cooler, the outlet of the front section is connected to the inlet of the rear section through cooling air outlet pipe 1-6; on the other side, the outlet of the rear section is connected to the inlet of the front section through cooling air inlet pipe 1-2. In this embodiment, the same-side arrangement refers to the entire film machine. In practical applications, the air velocity in the pipes is 10-15 m / s. When the air velocity in the pipes reaches the film surface, the average air velocity on the film surface must be controlled to be greater than 3 m / s. Figure 2 and Figure 3 As shown, the inlet and outlet air are arranged on opposite sides, specifically with cooling air inlet pipe 1-2 and cooling air outlet pipe 1-6 on both sides of the film cooler.

[0036] In this invention, the circulating air fan 1-3, the fresh air supply fan 1-5, and the exhaust fan 1-8 also play a role in controlling the flow rate. The relative humidity of the exhaust air from the exhaust duct 1-7 is controlled between 40% and 70%. The ratio of the circulating air volume in the circulating air duct 1-1 to the exhaust air volume in the exhaust duct 1-7 (i.e., the circulation concentration ratio of the cooling air circulation exhaust module) is 2 to 4. This invention controls the relative humidity of the exhaust air by controlling the exhaust air volume, thereby controlling the circulation concentration ratio. The specific circulation concentration ratio is determined based on the ambient air humidity, cooling air velocity, and vaporized water volume.

[0037] In practice, by circulating the cooling air, pollutants in the circulating air can be concentrated several times before being discharged in small quantities. This maintains a high relative humidity and pollutant concentration in the circulating air, achieving the effect of large-volume circulation of cooling air and small-volume, high-concentration discharge. Furthermore, the small amount of high-concentration exhaust air is easier to handle; it can be connected to a conventional organized waste gas VOCs treatment system.

[0038] like Figure 4As shown, the vaporization phase change enhanced cooling module includes a superfine atomization pump group 2-1, the inlet of the superfine atomization pump group 2-1 is connected with a process water or industrial water source, the outlet is connected with a superfine atomization distribution pipeline 2-2, the superfine atomization distribution pipeline 2-2 is connected with a spray vaporization unit 2-3, the spray vaporization unit 2-3 is arranged inside the box body of the film cooling machine and along the circumference of the box body, which can ensure that the superfine atomization mist can uniformly cover the front and back surfaces of the film in the film cooling machine.

[0039] The medium of the vaporization phase change enhanced cooling module is filtered clean process water or industrial water. In actual application, the process water or industrial water is pressurized by the superfine atomization pump group 2-1 and atomized into superfine water mist by the spray vaporization unit 2-3, and then sprayed into the inside of the film cooling machine and wet the high-temperature film surface.

[0040] Optionally, the vaporization phase change enhanced cooling module uses superfine atomization mist as the vaporization working medium, wherein the average particle size of the superfine atomization mist is 10-50 µm, the atomized water amount = (film surface vaporization water amount + air vaporization water amount + drift water amount) * excess adjustment coefficient, the atomized water amount can uniformly cover the front and back surfaces of the film and form a beaded condensation, and the atomization method includes pressure atomization and ultrasonic atomization.

[0041] The atomization method of the spray vaporization unit 2-3 can use pressure atomization, ultrasonic atomization, etc., but it should be ensured that the atomized mist can overcome the transverse wind speed in the box body of the film cooling machine to uniformly cover the film surface and form a beaded condensation, but not form a continuous water film, and can quickly vaporize to form a phase change heat transfer under the surface wind speed provided by the cooling air. Therefore, the superfine atomization mist should not be too large or too small, and the average particle size is 10-50 µm.

[0042] The multiple groups of spray vaporization units 2-3 can be arranged at an increasing interval, a decreasing water amount, or a combination thereof, to form a multiple dry-wet alternating process of “wet-dry-wet-dry” instead of continuous wetting. Along the direction of the film cooling travel, as the film surface temperature decreases, the multiple groups of spray vaporization units 2-3 are arranged at an increasing interval or a decreasing water amount along the direction of the film travel, the vaporization interval is increased, and the vaporization water amount is reduced. The multiple groups of spray vaporization units are arranged at an increasing interval or a decreasing water amount along the direction of the film travel, the film surface is intermittently wetted, and the high flow rate vaporization carrier gas provided by the circulating cooling air forms a multiple dry-wet alternating direct contact vaporization cooling process on the film surface. Compared with the solid-liquid heat transfer cooling between the spray liquid film and the film, the heat transfer efficiency is increased by more than 50%, and compared with the air cooling, the heat transfer efficiency is increased by more than 100%. The vaporization water amount should meet the heat balance and water balance requirements. Too little water amount affects the vaporization cooling effect, and too much water amount causes the film surface to be difficult to dry. The relative humidity of the circulating air is maintained at 40-70% by the control of the circulating air, so that the vaporization water amount meets the heat balance and water balance requirements.

[0043] As shown in Figure 5 The isolation air curtain flexible sealing module includes a high-pressure isolation air fan 3-1, the high-pressure isolation air fan 3-1 is communicated with a plurality of isolation air curtains 3-3 through an isolation air supply duct 3-2, and the isolation air curtains 3-3 are located in the box body of the film cooling machine and used for sealing the air inlet and outlet sides of the cooling unit.

[0044] The isolation air curtains 3-3 can be divided into inlet isolation air curtains, intermediate reversing isolation air curtains and outlet isolation air curtains according to the setting positions. The inlet isolation air curtains are connected with the film inlet side of the box body of the film cooling machine, the outlet isolation air curtains are connected with the film outlet side of the box body of the film cooling machine, and the intermediate reversing isolation air curtains are arranged at the intermediate cooling air reversing position of the cooling section of the film cooling system on the same side of the air inlet and outlet. The outlet isolation air curtains also have the function of quickly blowing and drying the residual liquid drops on the film surface.

[0045] In one specific embodiment of the present application, the control logic of the film cooling system is as follows:

[0046] Based on the film surface temperature and the dry-wet condition, the spray point and the spray flow of the vaporization phase change enhanced cooling module are controlled. When the film surface temperature is higher than the pre-set design temperature, the spray flow is increased, and vice versa.

[0047] Based on the exhaust air relative humidity, the circulating concentration ratio of the cooling air circulating concentration reduction and exhaust module is controlled. When the exhaust air relative humidity is higher than the pre-set design humidity, the exhaust air flow and the fresh air make-up air flow are increased, and vice versa.

[0048] The total circulating air flow is adjusted based on the temperature of the cooled film at the outlet of the film cooler. When the temperature is higher than the preset design temperature, the total circulating air flow is increased, and vice versa.

[0049] The application also discloses a film cooling method with cooling air concentration and reduction function, comprising the following steps.

[0050] Step one: the film surface is wetted by the superfine atomization distribution pipeline 2-2 and the spray vaporization unit 2-3, and the wetted film is obtained.

[0051] Step two: the cooling air is provided by the cooling air circulating concentration and reduction exhaust module, the wetted film is blown dry at high speed, the vaporization phase change heat transfer cooling is realized, and the hot air after contacting the film is generated.

[0052] Step three: most of the hot air after contacting the film is circulated to the air inlet side of the film cooler through the cooling air outlet pipeline 1-6, the circulating air pipeline 1-1, the cooling air inlet pipeline 1-2 and the circulating air fan 1-3. A small part of the hot air after contacting the film is reduced and exhausted through the cooling air outlet pipeline 1-6, the exhaust air pipeline 1-7 and the exhaust air fan 1-8, and at the same time, an equal amount of fresh air is supplemented through the fresh air supplement pipeline 1-4 and the fresh air supplement fan 1-5.

[0053] Step four: the end part of the cooling and cooling section of the film cooler is sealed by the isolation air curtain 3-3 to prevent the cooling air from leaking, and the residual moisture on the film surface is blown away.

[0054] Step five: based on the real-time monitoring of the film surface temperature, the exhaust air relative humidity and the temperature of the cooled film at the outlet of the film cooler, the spray amount, the circulating air amount, the exhaust air amount and the fresh air supplement amount are dynamically adjusted.

[0055] Example 3

[0056] The film cooling system in Example 2 is applied specifically and practically. In this embodiment, the original 26 million m³ / h cooling air volume of the film cooler is reformed, the current one-way air inlet and outlet is reformed into circulating air, i.e. the air after contacting and heat exchanging with the film returns to the cooling air inlet again, the example adopts the same side arrangement mode of the air inlet and return, the positive pressure air blowing section air volume is 80 million m³ / h, the negative pressure cooling section air volume is 60 million m³ / h, the total positive and negative pressure circulating cooling air volume is 140 million m³ / h, and the difference of 20 million m³ / h air volume is used for exhaust and supplement of equal amount of fresh air, the exhaust air volume is reduced to 25% of the original film cooling system exhaust air volume, and the unorganized air volume in the workshop is reduced by 180 million m³ / h. Table 1 is a film cooling system design selection parameter table.

[0057] First, a plurality of spray vaporization units 2-3 are arranged in the interior of the glue cooling machine, the surface of the glue sheet is wetted in sections, and after wetting, the glue sheet surface droplets are blown dry in sections by circulating cooling air to realize direct contact vaporization cooling. After realizing direct contact vaporization cooling, the cooling efficiency of the glue sheet cooling system is improved by more than 50%, and the necessary cooling air volume is reduced by more than 45%, and the cooling air volume is reduced to 140,000 m³ / h.

[0058] The total cooling air volume of 140,000 m³ / h is designed by circulating air. According to the one-time cooling air volume of 80,000 m³ / h and the circulating air volume of 60,000 m³ / h, the difference of 20,000 m³ / h is used for external exhaust, and an equal amount of fresh air is supplemented to maintain the stability of the circulating air water vapor partial pressure and the evaporation rate, control the relative humidity of the exhaust air, and avoid poor cooling effect due to insufficient evaporation water and water balance damage due to excessive water. At the same time, the end, top plate and other parts of the cooling section of the glue sheet cooling machine are physically sealed or treated by high-pressure isolation air curtain to reduce the air leakage rate of the system.

[0059] The experiment introduced in this embodiment can achieve the following effects:

[0060] (1) The air cooling is optimized to direct contact vaporization phase change heat transfer cooling with higher heat transfer efficiency. The vaporization water carries heat of 2454 kJ / kg, which is 100 times that of air. The comprehensive heat transfer coefficient is 500-1000 W / (m²·℃), which is 50 times that of air cooling. It is shown that the direct contact vaporization cooling effect provided by the embodiment is better than the existing air cooling technology. In addition, after realizing direct contact vaporization cooling, the air volume of the glue sheet cooling system is mainly used to provide the surface air speed for forced vaporization. The cooling principle is optimized from air cooling to phase change cooling. The total air volume of the glue cooling machine can be reduced by about 40-50%.

[0061] (2) The present single-way in-out air is transformed into circulating air, that is, the air after heat exchange with the glue sheet returns to the cooling air inlet again. The positive pressure air volume is 80,000 m³ / h, the negative pressure cooling air volume is 60,000 m³ / h, and the total circulating cooling air volume is 140,000 m³ / h. The difference of 20,000 m³ / h is used for external exhaust and supplemented with an equal amount of fresh air. The exhaust air volume is reduced to 25% of the original system exhaust air volume, and the unorganized air volume in the workshop is reduced by 180,000 m³ / h.

[0062] (3) The end is sealed and isolated by a high-pressure isolation air curtain, effectively avoiding air leakage and short circuit of the circulating air. The end sealing and isolation air also serves as drying and blowing air, which can ensure that the surface of the glue sheet is dry and free of water.

[0063] (4) A feedforward control system based on the air temperature field, moisture content, glue sheet surface temperature and humidity in the interior of the glue cooling machine, and the start-stop and running speed of the glue sheet machine is adopted to realize high-efficiency and energy-saving operation of the glue sheet cooling system. Compared with the traditional glue sheet cooling machine, the operation energy consumption is reduced by more than 40%.

[0064] Table 1 film cooling system design selection parameter table

[0065]

[0066] The application plays a combined effect by the three modules of the isolation air curtain flexible sealing module, the vaporization phase change enhanced cooling module and the cooling air circulation and exhaust module. Since the cooling function is mainly based on the vaporization phase change enhanced cooling, under the premise of not reducing the cooling performance of the film cooling machine, the large air volume cooling air and the exhaust air are reduced, the pollutants in the exhaust air are concentrated, and the economic air volume and the pollutant concentration that can be treated by the end treatment facility are reached.

[0067] The above is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the application, several improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A film cooling system with cooling air concentration and volume reduction function, characterized in that: The film cooling machine comprises a box, which is divided into one or several sealed cooling units by a flexible sealing module along the advancing direction of the film through an isolation air curtain, and is in communication with a vaporization phase change enhanced cooling module and a cooling air circulation exhaust module, wherein the vaporization phase change enhanced cooling module blows the film surface droplets to evaporate and achieve cooling after wetting the film surface with the cooling air provided by the cooling air circulation exhaust module.

2. The film cooling system having a cooling air concentration reduction function according to claim 1, characterized in that: The cooling air circulation exhaust module comprises a circulating air pipeline (1-1), which is in communication with a cooling air inlet pipeline (1-2) and one end of a cooling air outlet pipeline (1-6) respectively, the other end of the cooling air inlet pipeline (1-2) and the other end of the cooling air outlet pipeline (1-6) are in communication with the air inlet and air outlet of the cooling unit respectively, a circulating air fan (1-3) is arranged on the cooling air inlet pipeline (1-2) to provide circulating air power, the air outlet end of the cooling air outlet pipeline (1-6) is in communication with the exhaust air pipeline (1-7) between the exhaust fan (1-8), and the air inlet end of the cooling air inlet pipeline (1-2) is in communication with the fresh air supplement pipeline (1-4) between the fresh air supplement fan (1-5).

3. The film cooling system having a cooling air concentration reduction function according to claim 2, characterized in that: The relative humidity of the exhaust air of the exhaust air pipeline (1-7) is controlled to be between 40% and 70%, and the ratio of the circulating air volume of the circulating air pipeline (1-1) to the exhaust air volume of the exhaust air pipeline (1-7) ranges from 2 to 4.

4. The film cooling system having a cooling air concentration reduction function according to claim 2, characterized in that: The arrangement mode of the cooling air inlet pipeline (1-2) and the cooling air outlet pipeline (1-6) on the film cooling machine comprises same side arrangement and different side arrangement.

5. The film cooling system having a cooling air concentration reduction function according to claim 2, wherein: The average wind speed of the cooling air inlet pipeline (1-2) acting on the film surface is greater than 3 m / s.

6. The film cooling system having a cooling air concentration reduction function according to claim 1, wherein: The vaporization phase change enhanced cooling module comprises an ultra-fine atomization pump group (2-1), the inlet of the ultra-fine atomization pump group (2-1) is connected with a process water or industrial water source, the outlet is connected with an ultra-fine atomization distribution pipeline (2-2), the ultra-fine atomization distribution pipeline (2-2) is connected with a spray vaporization unit (2-3) in sections, and the spray vaporization unit (2-3) is arranged inside the box of the film cooling machine and arranged along the circumference of the box.

7. The film cooling system having a cooling air concentration reduction function according to claim 6, wherein: The vaporization phase change enhanced cooling module uses ultra-fine atomization mist droplets as the vaporization working medium, and the atomization mode comprises pressure atomization and ultrasonic atomization.

8. The film cooling system having a cooling air concentration reduction function according to claim 6, wherein: A plurality of spray vaporization units (2-3) are arranged along the advancing direction of the film, and the spray vaporization units are arranged with increasing spacing or decreasing water volume.

9. The film cooling system having a cooling air concentration reduction function according to claim 1, wherein: The isolation air curtain flexible sealing module comprises a high-pressure isolation air fan (3-1), which is in communication with a plurality of isolation air curtains (3-3) through an isolation air supply pipeline (3-2), and the isolation air curtain (3-3) is located in the box of the film cooling machine and used for sealing the air inlet and outlet sides of the cooling unit.

10. A film cooling method with a cooling air concentration reduction function, the film cooling system with a cooling air concentration reduction function according to any one of claims 1 to 9, characterized by: The method comprises the following steps: The film advances in the film cooling machine and first enters the cooling unit divided by the isolation air curtain flexible sealing module; The vaporization phase change reinforced cooling module wets the surface of the film, the film continues to advance, the cooling air circulation exhaust module blows the surface liquid drops of the film to dry and evaporate to cool, and a single wet and dry alternating process is realized; After completing the cooling process of a cooling unit, the film continues to advance to the next cooling unit, and the wet and dry alternating process is repeated. After passing through all the cooling units, the cooled film comes out of the film cooling machine.

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