Intelligent wind reduction and energy saving and centralized control method for unorganized VOCs emissions

Abstract

The application discloses a kind of intelligent wind reduction energy-saving and unorganized VOCs emission centralized management method, by being carried out main exhaust control, ground exhaust control and fresh air control, main exhaust, ground exhaust and fresh air are handled, so that hot air circulation system utilizes unorganized VOCs emission as fresh air, realizes wind reduction energy-saving.The application realizes the quantitative control of hot air circulation system air volume and the effective management of unorganized VOCs emission.

Description

Technical Field

[0001] The present invention belongs to the technical field of printing machinery and equipment, and relates to an intelligent wind reduction and energy saving method and a centralized control method for unorganized VOCs emissions. Background Art

[0002] For traditional printing equipment, the current hot air circulation system lacks quantitative control of air volume, the secondary heat energy utilization technology is crude, the secondary return air is used sparingly, and the exhaust volume is large, resulting in heat energy waste. The high secondary return air utilization reduces the exhaust volume, but it also reduces the equipment's drying performance and poses a safety hazard. Currently, there is no centralized control plan for unorganized VOCs (volatile organic compounds) emissions, the ink tanks are not tightly sealed, and the floor exhaust control and treatment are unscientific. The general floor exhaust treatment uses a "zeolite rotor" to concentrate the air before entering the RTO (regenerative thermal incinerator) system. This has high operating and maintenance costs, and the equipment collects fresh air from the hot air circulation system and floor exhaust from indoor sources, increasing the workshop's air conditioning load. Summary of the Invention

[0003] The purpose of the present invention is to provide an intelligent method for reducing wind speed and energy saving and centralized control of unorganized VOCs emissions, which realizes the quantitative control of the air volume of the hot air circulation system and the effective control of unorganized VOCs emissions.

[0004] The technical solution adopted by the present invention is an intelligent method for reducing wind speed and energy saving and centralized control of unorganized VOCs emissions. By performing main exhaust control, ground exhaust control and fresh air control, the main exhaust air, ground exhaust air and fresh air are processed, so that the hot air circulation system uses unorganized VOCs emissions as fresh air to achieve wind reduction and energy saving.

[0005] The present invention is also characterized in that:

[0006] The specific steps include:

[0007] Step 1: seal the ink tanks of each color group, and set the total number of color groups to N;

[0008] Step 2: Set up main exhaust control, floor exhaust control, fresh air control and hot air circulation system on the printing pipelines of N color groups. During workshop production:

[0009] The hot air circulation system adopts automatic wind pressure balancing technology and LEL automatic control technology to achieve automatic tracking of supply and exhaust pressures; the floor exhaust control collects unorganized VOCs emissions and supplies them to the fresh air control, which supplies fresh air to the hot air circulation system. The main exhaust control discharges the waste gas of the hot air circulation system at a safe exhaust volume to the RTO system for treatment;

[0010] When the workshop stops production: the floor exhaust control will discharge the floor exhaust air to the outdoors through the main exhaust control, so that the workshop air does not need to be replaced by the workshop air conditioner.

[0011] In step 2, the main exhaust control includes a main exhaust main pipe, which is connected to N color group exhaust ducts in parallel. Each color group exhaust duct, that is, the color group i exhaust duct, is equipped with a color group i electric damper, where i is any color group number between 1 and N. The main exhaust main pipe supplies air through the main exhaust supply air duct. The main exhaust main pipe is sequentially equipped with a wind pressure sensor A, a wind speed measuring instrument A and a main exhaust fan. The main exhaust control matches different motor frequencies of the main exhaust fan according to the collected wind pressure and air volume data; a T-type valve A is provided on the main exhaust supply air duct, and the T-type valve A changes the flow direction of the main exhaust supply air duct. When the workshop is stopped, the air flows to the outdoors, and when the workshop is in production, the air flows to the RTO system.

[0012] In step 2, the floor exhaust control includes a floor exhaust main pipe, which is respectively connected to N color group floor exhaust pipes in parallel. Each color group floor exhaust pipe, that is, the color group i floor exhaust pipe, is provided with a color group i pneumatic damper. The floor exhaust main pipe supplies air through the floor exhaust air supply pipe. The floor exhaust main pipe is sequentially provided with a wind speed measuring instrument B and a floor exhaust fan. The floor exhaust control matches the different motor frequencies of the floor exhaust fan according to the collected air volume data; a T-type valve B is provided on the floor exhaust air supply pipe, and the T-type valve B converts the flow direction of the floor exhaust air supply pipe. When the workshop is stopped, the air flows to the main exhaust air supply pipe and is discharged to the outside, or flows to the fresh air control when the workshop is in production, supplying fresh air to the hot air circulation system.

[0013] In step 2, the fresh air control includes a fresh air main pipe, on which N color group fresh air ducts are connected in parallel. Each color group fresh air duct, i.e., the color group i fresh air duct, is provided with a color group i gravity damper, which acts as a balancing counterweight according to the wind speed of the color group i fresh air duct. A wind pressure sensor B is provided on the fresh air main pipe, which distributes the fresh air to the N color groups respectively. Each color group duct is provided with an electric damper, which is set to different gears. When the local exhaust volume cannot meet the fresh air demand of the hot air circulation system, the collected wind pressure data will show a slightly negative pressure state of the fresh air main pipe. The electric damper matches the gear opening and closing according to the wind pressure data to supplement the fresh air volume of the fresh air main pipe from the room.

[0014] In step 2, when the workshop stops production, the pneumatic damper and electric damper of the color group i of the floor exhaust control are opened; the T-type valve A of the main exhaust control switches the main exhaust air supply pipe to flow to the outside, and the total floor exhaust volume = ∑ floor exhaust volume 色组i , the floor exhaust fan is turned on, and the total floor exhaust volume matches different motor frequencies according to the number of color groups i; the floor exhaust air is discharged to the outdoors through the main exhaust air supply pipe controlled by the main exhaust.

[0015] In step 2, during workshop production, the specific steps are as follows:

[0016] 1) Determine the wind speed and air intake of the color group oven nozzle according to the different printing layouts; 2) Adjust the size of the wind shield at the inlet and outlet of the color group oven to determine the negative pressure air intake of the oven outlet;

[0017] 3) The electric damper of color group i under the main exhaust control is set to different gears. According to the exhaust sampling concentration detection data collected by the LEL system, the gear opening and closing are automatically matched to control the safe exhaust volume of color group i; 4) The secondary return air section of the curing hot air circulation system is automatically matched with the secondary return air volume through the safe exhaust volume of color group i to determine the fresh air volume required by color group i; 5) Intake air volume 色组i : Secondary return air volume 色组i +Fresh air volume 色组i ;6) Exhaust volume 色组i : Air intake 色组i +Negative pressure air inlet volume of oven material port 色组i - Secondary return air volume 色组i ;7) Main exhaust volume: ∑ exhaust volume 色组i 8) The T-type valve B of the floor exhaust control switches the floor exhaust air supply pipe to fresh air control, and the pneumatic damper of color group i is opened for production color group i; 9) Total floor exhaust volume: ∑ floor exhaust volume 色组i ; 10) Total fresh air volume: total floor exhaust volume + electric damper supply air volume; 11) T-type valve A of the main exhaust control switches the main exhaust air supply pipe to the RTO system; 12) The main exhaust fan, floor exhaust fan and the corresponding production color group i hot air circulation fan are turned on. According to the number of color groups i and the printing layout, the total main exhaust volume, the total floor exhaust volume and the air intake volume are adjusted. 色组i Match different motor frequencies to maintain the oven's micro-negative pressure state and automatic balance of duct wind pressure; 13) The floor exhaust control supplies the floor exhaust air to the fresh air control as fresh air, and the fresh air control supplies the fresh air to the hot air circulation system. The main exhaust control discharges the waste gas of the hot air circulation system's safe exhaust volume to the RTO system for treatment.

[0018] The beneficial effect of the present invention is that it centrally manages intelligent airflow reduction and energy conservation, and fugitive VOCs emissions, comprehensively considering factors such as airflow reduction and concentration increase. Based on a universal hot air circulation system, LEL system, and RTO system, the main exhaust, ground exhaust, and fresh air are scientifically processed through main exhaust control, ground exhaust control, and fresh air control, enabling the hot air circulation system to utilize fugitive VOCs emissions as fresh air, meeting the needs of airflow reduction and energy conservation. This not only meets the needs of airflow reduction and energy conservation, but also achieves safe air volume control, while also taking into account the environmental protection goal of reducing exhaust emissions, and reducing the operating costs of the RTO system and the workshop air conditioning load. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart of the intelligent wind reduction and energy saving and centralized control method for unorganized VOCs emissions of the present invention.

[0020] In the figure, 2. wind pressure sensor A, 3. wind speed measuring instrument A, 4. main exhaust fan, 5. T-type valve A, 6. T-type valve B, 7. floor exhaust fan, 8. wind speed measuring instrument B, 9. color group N pneumatic valve, 10. hot air circulation fan, 11. color group N gravity damper, 12. electric damper, 13. color group N electric damper, 14. wind pressure sensor B, 16. color group 1 gravity damper, 18. color group 1 pneumatic damper, 19. color group 1 electric damper. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] The intelligent wind reduction and energy saving and unorganized VOCs emission centralized control method of the present invention has the following process: Figure 1 As shown ( Figure 1 The central main exhaust control, hot air circulation system, floor exhaust control and fresh air control are distinguished by different line shapes). The specific steps are as follows:

[0024] Step 1: Seal the ink tank of the color group tightly to reduce the emission of unorganized VOCs from ink solvents;

[0025] Step 2: Set up floor exhaust control, fresh air control, hot air circulation system, main exhaust control, LEL system, and RTO system;

[0026] Step 3: The floor exhaust fan 7 and the hot air circulation fan 10 are all controlled by variable frequency motors. The floor exhaust control, fresh air control, hot air circulation system, and main exhaust control will match different motor frequencies according to the wind flow data (wind pressure and air volume);

[0027] Step 4: The main exhaust control is equipped with the color group i electric damper (since i is any value from 1 to N, the color group i electric damper represents the electric damper of any color group between the color group 1 electric damper 19 and the color group N electric damper 13), the color group i exhaust duct (the color group i exhaust duct represents any color group exhaust duct from the color group 1 exhaust duct to the color group N exhaust duct), the main exhaust main pipe, the main exhaust fan 4, and the main exhaust air supply pipe; the main exhaust main pipe is equipped with a wind pressure sensor A2 and an anemometer A3 The main exhaust control matches the different motor frequencies of the main exhaust fan 4 according to the collected wind pressure and air volume data; a T-type valve A5 is provided on the main exhaust air supply duct, and the T-type valve A5 changes the flow direction of the main exhaust air supply duct, and the air flows to the outdoors when the workshop is shut down, or flows to the RTO system when the workshop is in production; (color group i is the i-th color group, i is an integer from 1 to N, N is the number of color groups of the equipment, such as 9-color machine, then N is equal to 9, and the following steps are repeated similarly. Any pipeline between color group 1 to color group N is set in parallel).

[0028] Step 5: The floor exhaust control system includes the floor exhaust pipe of color group i (the floor exhaust pipe of color group i refers to any floor exhaust pipe of color group 1 to any floor exhaust pipe of color group N), the pneumatic damper of color group i (the pneumatic damper of color group i refers to any pneumatic damper of color group 1 18 to any pneumatic damper of color group N 9), the floor exhaust main pipe, the floor exhaust fan 7, and the floor exhaust air supply pipe;

[0029] The main floor exhaust pipe is equipped with an anemometer B8, and the floor exhaust control matches the different motor frequencies of the floor exhaust fan 7 according to the collected air volume data; the floor exhaust air supply pipe is equipped with a T-type valve B6, which changes the flow direction of the floor exhaust air supply pipe. When the workshop is shut down, the air flows to the main exhaust air supply pipe to be discharged outdoors, or when the workshop is in production, it flows to the fresh air control to supply fresh air to the hot air circulation system.

[0030] Step 6: The fresh air control is equipped with a fresh air main pipe, a color group i fresh air pipe (the color group i fresh air pipe refers to any color group fresh air pipe between the color group 1 fresh air pipe and the color group N fresh air pipe), and a color group i gravity damper (the color group i gravity damper refers to any color group gravity damper between the color group 1 gravity damper 16 and the color group N gravity damper 11); the fresh air main pipe is equipped with a wind pressure sensor B14 and an electric damper 12. The electric damper 12 is set to different gears. The local exhaust volume cannot meet the use of the hot air circulation system. When fresh air is needed, the collected wind pressure data will show a slight negative pressure state in the fresh air main. The electric damper 12 will open and close according to the wind pressure data to replenish the fresh air volume from the indoor fresh air main. The gravity damper of color group i acts as a balancing weight based on the wind speed of 12m / s in the fresh air duct of color group i. The damper opens when the wind speed is greater than 12m / s and closes when it is less than 12m / s (the hot air circulation fan 10 of color group i (any color group between color groups 1 to color groups N is equipped with a hot air circulation fan 10)) when the machine is turned on and closes when it is turned off).

[0031] Step 7: When the workshop stops production, based on steps 1 to 5, the floor exhaust control system will exhaust the floor exhaust air to the outside through the main exhaust control system, without replacing the workshop air through the workshop air conditioner. The specific process is as follows:

[0032] The pneumatic damper and electric damper 12 of the color group i of the floor exhaust control are opened; the T-type valve A5 of the main exhaust control switches the main exhaust air supply pipe to flow outdoors; the total floor exhaust volume = ∑ floor exhaust volume 色组i ; The floor exhaust fan 7 is turned on, and the total floor exhaust volume matches different motor frequencies according to the number of color groups i; the floor exhaust air is discharged to the outside through the main exhaust air supply pipe controlled by the main exhaust.

[0033] Step 8. During production in the workshop, based on steps 1 to 6, the hot air circulation system adopts automatic wind pressure balancing technology and LEL automatic control technology to achieve automatic follow-up of the supply and exhaust pressures, and stabilize the oven at the set micro-negative pressure state, which not only meets the energy-saving needs, but also achieves safe air volume control, while taking into account the reduction of the total exhaust volume; the floor exhaust control collects the unorganized VOCs emissions and supplies them to the fresh air control, which supplies the fresh air to the hot air circulation system, and the main exhaust control discharges the waste gas of the hot air circulation system's safe exhaust volume to the RTO system for treatment;

[0034] Step 9: Based on steps 7 and 8, the intelligent wind reduction and energy saving and centralized control of unorganized VOCs emissions are completed.

[0035] Example 2

[0036] Based on Example 1, the specific process of step 8 is as follows:

[0037] 1) Determine the wind speed and air intake of the color group oven nozzle according to the different printing layouts; 2) Adjust the size of the wind shield at the inlet and outlet of the color group oven to determine the negative pressure air intake of the oven outlet;

[0038] 3) The electric damper of color group i under the main exhaust control is set to different gears. According to the exhaust sampling concentration detection data collected by the LEL system, the gear opening and closing are automatically matched to control the safe exhaust volume of color group i; 4) The mixing box structure of the hot air circulation system is optimized, the secondary return air section is solidified, and the secondary return air volume is automatically matched with the safe exhaust volume of color group i to determine the fresh air volume required by color group i; 5) Intake air volume 色组i : Secondary return air volume 色组i +Fresh air volume 色组i ;6) Exhaust volume 色组i : Air intake 色组i +Negative pressure air inlet volume of oven material port 色组i - Secondary return air volume 色组i ;7) Main exhaust volume: ∑ exhaust volume 色组i 8) The T-type valve B (6) of the floor exhaust control switches the floor exhaust air supply pipe to the fresh air control, and opens the pneumatic damper of color group i corresponding to the production color group i; 9) Total floor exhaust volume: ∑ floor exhaust volume 色组i ; 10) Total fresh air volume: total floor exhaust volume + electric damper supply air volume; 11) T-type valve A (5) of main exhaust control switches the main exhaust air supply pipe to the RTO system; 12) Main exhaust fan 4, floor exhaust fan 7 and corresponding production color group i hot air circulation fan 10 are turned on, and the total main exhaust volume, floor exhaust volume and air intake volume are adjusted according to the number of color groups i and the printing layout. 色组iMatch different motor frequencies to maintain the oven's micro-negative pressure state and automatic balance of duct wind pressure; 13) The floor exhaust control supplies the floor exhaust air to the fresh air control as fresh air, and the fresh air control supplies the fresh air to the hot air circulation system. The main exhaust control discharges the waste gas of the hot air circulation system's safe exhaust volume to the RTO system for treatment.

[0039] Example 3

[0040] The economic performance of the intelligent wind reduction and energy-saving system and the fugitive emission system provided in Examples 1 and 2 was analyzed. The application case of the Beiren 10-color Zhirui 4.0 printing press is shown in Table 1 below, with a maximum printing speed of 400 m / min:

[0041] Table 1

[0042]

[0043] The data in Table 1 are the actual results of applying the control method provided by the present invention in actual production: the total exhaust volume of a 10-color printing press during printing is 15000m 3 / h, to achieve dynamic balance, the oven needs to be supplemented with 10400m3 of fresh air 3 / h, all from floor exhaust.

[0044] Under the same printing conditions, the economic efficiency of the control scheme provided by the present invention is compared with that of the traditional scheme:

[0045] Traditional solution: The equipment takes air in indoor, and the independent fan exhausts the air outdoors and introduces it into the "rotary adsorption device", and then discharges it into the RTO after concentration.

[0046] Equipment operation process: fresh air intake from the workshop 10400m 3 / h, the oven is kept in a slightly negative pressure state, and the oven inlet and outlet are taken from the workshop at 4600m 3 / h, the total air intake of the equipment from the workshop is 15000m 3 / h, independent floor exhaust extracts air volume from the workshop 10400m 3 To maintain a slightly negative pressure in the workshop, the air conditioning system needs to supply air to the workshop: 15000 + 10400 = 25400m 3 / h;

[0047] The present invention's solution: Equipment indoor air is drawn in, while floor exhaust air is extracted by an independent fan. The total amount is controlled to match the equipment's fresh air demand, and fresh air is introduced into the equipment for digestion. Equipment exhaust air is directly connected to the RTO, eliminating the need for rotor adsorption and concentration of the floor exhaust (low-concentration air).

[0048] Economic analysis:

[0049] 1. The present invention reduces the air supply volume of the air conditioning system in the printing workshop by 10400m 3 / h (ground exhaust volume), the installed load of the air conditioning system is reduced, and both the direct investment cost and the later operation electricity cost are reduced;

[0050] 2. In the scheme, the ground exhaust is directly digested by the new air of the equipment, and the rotary adsorption device is not needed, and the direct investment cost and the later operation and maintenance cost and energy consumption cost are not generated.

[0051] According to the measurement, the direct equipment investment cost of the air conditioning system and the rotary adsorption device of the customer workshop is reduced by 300,000, and the later operation and maintenance cost is saved by more than 30,000 per year on average.

Claims

1. Intelligent wind reduction and energy saving and centralized control method for fugitive VOCs emissions, characterized by: By controlling the main exhaust, ground exhaust, and fresh air, the main exhaust, ground exhaust, and fresh air are processed, so that the hot air circulation system uses unorganized VOCs emissions as fresh air, achieving air reduction and energy saving. The specific steps include: Step 1: seal the ink tanks of each color group, and set the total number of color groups to N; Step 2: Set up main exhaust control, floor exhaust control, fresh air control and hot air circulation system on the printing pipelines of N color groups. During workshop production: The hot air circulation system adopts automatic wind pressure balancing technology and LEL automatic control technology to achieve automatic tracking of supply and exhaust pressures; the floor exhaust control collects unorganized VOCs emissions and supplies them to the fresh air control, which supplies fresh air to the hot air circulation system. The main exhaust control discharges the waste gas of the hot air circulation system at a safe exhaust volume to the RTO system for treatment; When the workshop stops production: the floor exhaust control system will discharge the floor exhaust air to the outside through the main exhaust control system, so that the workshop air will not be replaced by the workshop air conditioner; In step 2, the main exhaust control includes a main exhaust main pipe, N color group exhaust pipes are connected in parallel to the main exhaust main pipe, each color group exhaust pipe, i.e., the color group i exhaust pipe, is provided with a color group i electric damper, wherein i is any color group number between 1 and N, the main exhaust main pipe supplies air through the main exhaust air supply pipe, the main exhaust main pipe is provided with a wind pressure sensor A (2), a wind speed measuring instrument A (3) and a main exhaust fan (4) in sequence, the main exhaust control matches different motor frequencies of the main exhaust fan (4) according to the collected wind pressure and air volume data; the main exhaust air supply pipe is provided with a T-type valve A (5), the T-type valve A (5) switches the flow direction of the main exhaust air supply pipe, the air flows to the outdoors when the workshop is stopped, and flows to the RTO system when the workshop is in production; In step 2, the floor exhaust control includes a floor exhaust main pipe, which is respectively connected to N color group floor exhaust pipes in parallel, each color group floor exhaust pipe, i.e., the color group i floor exhaust pipe, is provided with a color group i pneumatic damper, and the floor exhaust main pipe supplies air through the floor exhaust air supply pipe. The floor exhaust main pipe is sequentially provided with an anemometer B (8) and a floor exhaust fan (7), and the floor exhaust control matches different motor frequencies of the floor exhaust fan (7) according to the collected air volume data; a T-type valve B (6) is provided on the floor exhaust air supply pipe, and the T-type valve B (6) converts the flow direction of the floor exhaust air supply pipe, and when the workshop is stopped, the air flows to the main exhaust air supply pipe to be discharged outdoors, or when the workshop is in production, the air flows to the fresh air control to supply fresh air to the hot air circulation system; In step 2, the fresh air control includes a fresh air main pipe, N color group fresh air pipes are connected in parallel to the fresh air main pipe, each color group fresh air pipe, i.e., the color group i fresh air pipe is provided with a color group i gravity damper, and the color group i gravity damper acts as a balancing weight according to the wind speed of the color group i fresh air pipe; a wind pressure sensor B (14) is provided on the fresh air main pipe, and the fresh air main pipe distributes the fresh air to the N color groups respectively, and each color group pipe is provided with an electric damper (12), and the electric damper (12) is set to different gears. When the local exhaust volume cannot meet the fresh air demand of the hot air circulation system, the collected wind pressure data will show a slight negative pressure state of the fresh air main pipe, and the electric damper (12) matches the gear opening and closing according to the wind pressure data to supplement the fresh air volume of the fresh air main pipe from the room; In step 2, when the workshop stops production, the pneumatic damper and electric damper (12) of the color group i controlled by the floor exhaust are opened; the T-type valve A (5) controlled by the main exhaust switches the main exhaust air supply pipe to flow outdoors, and the total floor exhaust volume = ∑ floor exhaust volume 色组i , the floor exhaust fan (7) is turned on, and the total floor exhaust volume is matched with different motor frequencies according to the number of color groups i; the floor exhaust air is discharged to the outside through the main exhaust air supply pipe controlled by the main exhaust.

2. The intelligent wind reduction and energy saving and centralized control method for fugitive VOCs emissions according to claim 1 is characterized by: In the step 2, During workshop production, the specific operating steps are as follows: 1) Determine the wind speed and oven air intake of the color group oven nozzle according to the different printing layouts; 2) Adjust the size of the wind shield at the inlet and outlet of the color group oven to determine the negative pressure air intake of the oven outlet; 3) Set the electric damper of the color group i controlled by the main exhaust to different gears, and automatically match the gear opening and closing according to the exhaust sampling concentration detection data collected by the LEL system to control the safe exhaust volume of color group i; 4) The secondary return air section of the curing hot air circulation system is automatically matched with the secondary return air volume through the safe exhaust volume of color group i to determine the fresh air volume required by color group i; 5) Intake air volume 色组i : Secondary return air volume 色组i +Fresh air volume 色组i 6) Exhaust volume 色组i : Air intake 色组i +Negative pressure air inlet volume of oven material port 色组i - Secondary return air volume 色组i ;7) Main exhaust volume: ∑ exhaust volume 色组i ;8) T-type valve B (6) of floor exhaust control switches the floor exhaust air supply pipe to fresh air control, and opens the pneumatic damper of color group i corresponding to production color group i;9) Total floor exhaust volume: ∑ floor exhaust volume 色组i ; 10) Total fresh air volume: total floor exhaust volume + electric damper supply air volume; 11) T-type valve A (5) of main exhaust control switches the main exhaust air supply pipe to the RTO system; 12) Main exhaust fan (4), floor exhaust fan (7) and corresponding production color group i hot air circulation fan (10) are turned on. According to the number of color groups i and the printing layout, the total main exhaust volume, total floor exhaust volume and air intake volume are 色组i Match different motor frequencies to maintain the oven's micro-negative pressure state and automatic balance of duct wind pressure; 13) The floor exhaust control supplies the floor exhaust air to the fresh air control as fresh air, and the fresh air control supplies the fresh air to the hot air circulation system. The main exhaust control discharges the waste gas of the hot air circulation system's safe exhaust volume to the RTO system for treatment.

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