A mixed waste gas treatment device and its treatment method in synthetic leather production

Abstract

The present invention relates to a mixed waste gas treatment device and a treatment method in synthetic leather production, including an absorption tower and an inlet waste gas pipe. A first fan is connected in series on the inlet waste gas pipe. A concentration sensor for real-time detecting the concentration of DMF organic solvent substances in the waste gas is arranged at the inlet end of the inlet waste gas pipe. The concentration sensor is electrically connected to a main control board for receiving the electrical signal of the concentration of DMF organic solvent substances in the waste gas and controlling the rotation speed of the first fan based on this concentration. The main control board is electrically connected to the first fan. A rotation speed monitoring and calibration component for real-time correcting and adjusting the actual rotation speed to reach the rotation speed controlled by the main control board is electrically connected to the first fan. On the basis of realizing the control of the waste gas flow rate, the rotation speed of the first fan is adjusted according to the concentration of DMF organic solvent substances in the waste gas, so that the product of the waste gas flow rate and the concentration of DMF organic solvent substances in the waste gas reaches the maximum total amount of DMF treatment in the absorption tower per unit time.

Description

Technical Field

[0001] The present invention relates to the field of synthetic leather waste gas treatment, and particularly to a mixed waste gas treatment device and a treatment method thereof in synthetic leather production. Background Art

[0002] Synthetic leather is a plastic product that simulates the composition and structure of natural leather and can be used as its substitute material. It is usually made with an impregnated non-woven fabric as the mesh layer and a microporous polyurethane layer as the grain surface layer. Its front and back sides are very similar to leather, and it has a certain breathability, being closer to natural leather than ordinary artificial leather. It is widely used in making shoes, boots, luggage, balls, etc. During the production process of synthetic leather, a large amount of waste gas is generated, and usually, a waste gas treatment device is used for recovery treatment. For example, the Chinese utility model patent with the patent number 201521040474.5 discloses a closed DMF organic solvent waste gas recovery device, which includes a first fan. The first fan is connected to an absorption tower. An adsorption layer capable of adsorbing fine particles is provided at the connection between the first fan and the absorption tower. Inside the absorption tower, several breathable spray layers are spaced from low to high. The bottom of the spray layer is equipped with spray heads, and the spray heads are connected to a water pipe outside the absorption tower. A waste liquid recovery tank is provided at the bottom of the absorption tower, and the waste liquid recovery tank is connected to a waste liquid collection box through a pump. The waste gas recovery device with the above structure uses the sprayed water mist to capture the DMF organic solvent substances in the waste gas and then collects and processes them, improving the waste gas recovery rate, and the recycled spray water is environmentally friendly and reliable. However, in the above waste gas recovery device, the upper limit total amount of the DMF organic solvent substances in the waste gas that can be processed per unit time by the spray layer inside the absorption tower is constant, while the concentration of the DMF organic solvent substances contained in the waste gas is in a changing state. The first fan at the air inlet intakes air at a fixed rotational speed, and the total flow rate of the waste gas intake per unit time is constant, resulting in the treatment efficiency of the DMF organic solvent substances in the waste gas not reaching the maximum, seriously reducing the waste gas treatment efficiency, increasing the corresponding energy consumption, and being inconvenient for observing and calibrating the waste gas treatment in real time, and unable to control the precise intake of waste gas for waste gas treatment. Therefore, improvements are needed. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a mixed waste gas treatment device and a treatment method thereof in synthetic leather production that are convenient for precisely controlling and matching the waste gas flow rate with the change amount of DMF, have high waste gas treatment efficiency, and significantly reduce energy consumption.

[0004] The technical solution of the present invention is realized as follows: A mixed waste gas treatment device in synthetic leather production includes an absorption tower and an exhaust gas inlet pipe connected to the side wall of the absorption tower. A first fan is connected in series on the exhaust gas inlet pipe. The top of the absorption tower is connected to a drying box through a first connecting pipe. One side of the drying box away from the first connecting pipe is connected to a chimney through a second connecting pipe. A second fan is connected in series on the second connecting pipe. Inside the absorption tower, there are several layers of breathable spray layers spaced from low to high. Spray heads are installed at the bottom of the spray layers. The spray heads are connected to a water pipe, and a water pump is connected in series on the water pipe. A waste liquid recovery tank is provided at the bottom of the absorption tower. The waste liquid recovery tank is connected to a waste liquid recovery box through a recovery pipe, and a recovery pump is connected in series on the recovery pipe. It is characterized in that: A concentration sensor for real-time detection of the concentration of DMF organic solvent substances in the waste gas is provided at the inlet end of the exhaust gas inlet pipe. The concentration sensor is electrically connected to a main control board for receiving the electrical signal of the concentration of DMF organic solvent substances in the waste gas and controlling the rotation speed of the first fan based on this concentration. The main control board is electrically connected to a display for digital display. The main control board is electrically connected to the first fan, and a rotation speed monitoring and calibration component for real-time correction and adjustment to make its actual rotation speed reach the rotation speed controlled by the main control board is electrically connected to the first fan.

[0005] By adopting the above technical solution, since the maximum total amount of DMF in the waste gas processed per unit time inside the absorption tower remains unchanged, in order to maximize the processing efficiency of the waste gas per unit time, a concentration sensor is provided at the inlet end of the waste gas inlet pipe. After the concentration sensor detects and senses the concentration of the DMF organic solvent substance in the waste gas in real time, it transmits an electrical signal to the main control board electrically connected to it. After receiving this electrical signal, the main control board issues a corresponding first fan operating speed command to the first fan according to the concentration of the DMF organic solvent substance in the waste gas and the value of the maximum total amount of DMF in the waste gas that can be processed per unit time inside the absorption tower. The first fan operates and adjusts its speed in real time according to the concentration of the DMF organic solvent substance in the waste gas entering the waste gas inlet pipe, achieving the real-time adjustment and control effect of controlling the waste gas flow. The size of the waste gas flow decreases as the concentration of the DMF organic solvent substance in the waste gas increases, and increases as the concentration of the DMF organic solvent substance in the waste gas decreases. The inverse change ratio between the two is recorded in the main control board, and based on receiving the electrical signal from the concentration sensor, a corresponding speed size command is issued to the first fan. The first fan operates and pumps waste gas with a corresponding flow rate into the absorption tower for treatment. In order to adjust the actual operating speed of the first fan in real time and improve the precise control of the waste gas flow per unit time, a speed detection and calibration component is electrically connected to the first fan, which is used to correct and adjust the actual speed of the first fan to reach the speed controlled on the main control board, avoiding errors in the actual operating speed of the first fan caused by losses in the circuit, which affects the precise control of the waste gas flow entering per unit time. In order to facilitate the user to observe the waste gas flow and the corresponding concentration of the DMF organic solvent substance in the waste gas in real time, the main control board is electrically connected to a display for digital display, which is used to display the corresponding values in real time through the display, so that the user can understand the state of waste gas treatment. Compared with the prior art, on the basis of realizing the control of the waste gas flow, the speed of the first fan is adjusted according to the concentration of the DMF organic solvent substance in the waste gas, so that the product of the waste gas flow and the concentration of the DMF organic solvent substance in the waste gas reaches the maximum total amount of DMF in the waste gas processed per unit time inside the absorption tower, thereby improving the overall waste gas treatment efficiency of the waste gas treatment device and reducing the energy consumption and treatment cost.

[0006] The present invention is further set as follows: The speed detection and calibration component includes a current energy consumption feedback module provided on the first fan for detecting and feedbacking the current energy consumption of the first fan in real time. A comparison module is provided on the main control board for determining and sending an electrical signal to the first fan to adjust the speed by comparing the actual energy consumption feedbacked by the current energy consumption feedback module with the set energy consumption of the speed controlled on the main control board.

[0007] By adopting the above technical solution, after the current energy consumption feedback module arranged on the first fan detects the current energy consumption of the first fan in real time, the actual energy consumption on the first fan is fed back to the comparison module on the main control board. On the comparison module, the actual energy consumption of the first fan is compared with the set energy consumption for controlling the rotation speed of the first fan issued by the main control board. When the actual energy consumption is equal to the set energy consumption, the main control board sends an electrical signal to the current energy consumption feedback module, and the current energy consumption feedback module continues to continuously monitor and feedback the actual energy consumption of the first fan; when there is a difference between the actual energy consumption and the set energy consumption, the main control board generates a corresponding adjustment value and transmits it to the first fan for calibration of the rotation speed. After calibration, the current energy consumption feedback module continues to continuously monitor and feedback the actual energy consumption of the first fan. Through the above energy consumption detection, feedback and calibration of the first fan, the accurate control of the waste gas flow rate per unit time is ensured, so as to ensure that the incoming waste gas volume can be processed in the absorption tower, and at the same time reach the maximum value that the absorption tower can process per unit time, improving the treatment efficiency of the waste gas.

[0008] The present invention is further configured as: a flow sensor for detecting the actual flow rate of the waste gas introduced into the absorption tower per unit time and feeding it back to the main control board is arranged on the inner pipe wall of the waste gas inlet pipe and between the first fan and the absorption tower. The flow sensor is electrically connected to the main control board, and the main control board transmits an electrical signal to the water pump to lower the operating power of the water pump based on the actual waste gas flow rate fed back by the flow sensor.

[0009] By adopting the above technical solution, a flow sensor is arranged on the inner pipe wall of the waste gas inlet pipe and between the first fan and the absorption tower. After the first fan operates and the water pump operates at the maximum power, the flow sensor is used to detect the actual flow rate of the waste gas introduced into the absorption tower per unit time in the waste gas inlet pipe and feed back this value to the main control board. Based on the actual waste gas flow rate value fed back on the main control board, it is compared with the required waste gas flow rate value obtained by comparing the DMF organic solvent substance concentration in the waste gas with the maximum total amount of DMF that the absorption tower can process per unit time of the waste gas. An electrical signal is sent to the water pump to lower the operating power of the water pump, so as to reduce the amount of water introduced by the water pump per unit time, thereby lowering the total amount value of DMF in the actual waste gas processed inside the absorption tower, which corresponds to the product of the actual waste gas flow rate value and the DMF organic solvent substance concentration in the waste gas. On the one hand, the energy consumption of the water pump is reduced, and on the other hand, the unnecessary consumption of water volume is reduced.

[0010] The present invention is further configured as: a power monitoring and calibration component for real-time correction and adjustment to make its actual power reach the control output power of the main control board is electrically connected to the water pump.

[0011] By adopting the above technical solution, in order to further ensure that the actual power of the water pump meets the requirement of reducing the operating power of the water pump controlled by the electrical signal sent by the main control board, thereby avoiding unnecessary energy consumption and cost loss, and at the same time ensuring the treatment effect of waste gas, a power monitoring and calibration component is electrically connected to the water pump for real-time calibration to adjust its actual power to reach the output power controlled by the main control board.

[0012] The present invention is further configured as: the power monitoring and calibration component includes an energy consumption power feedback module provided on the water pump for real-time detection and feedback of the current energy consumption of the water pump, and a comparison power module is provided on the main control board for receiving the difference obtained by comparing the actual energy consumption feedback by the energy consumption power feedback module with the output energy consumption controlled on the main control board to determine the electrical signal sent to the water pump to adjust the output power of the water pump.

[0013] By adopting the above technical solution, after the energy consumption power feedback module provided on the water pump detects the current energy consumption of the water pump in real time, the actual energy consumption on the water pump is fed back to the comparison power module on the main control board. The comparison power module compares the actual energy consumption of the water pump with the set energy consumption for controlling the water pumping volume of the water pump issued by the main control board. When the actual energy consumption is equal to the set energy consumption, the main control board sends an electrical signal to the comparison power module, and the comparison power module continues to continuously monitor and feedback the actual energy consumption of the water pump; when there is a difference between the actual energy consumption and the set energy consumption, the main control board generates a corresponding adjustment value and transmits it to the water pump for speed calibration. After calibration, the comparison power module continues to continuously monitor and feedback the actual energy consumption of the water pump. Through the above water pump energy consumption detection, feedback and calibration, it is ensured that the actual power of the water pump meets the requirement of reducing the operating power of the water pump controlled by the electrical signal sent by the main control board, avoiding unnecessary energy consumption and cost loss, and ensuring the treatment effect of waste gas.

[0014] The present invention also discloses a treatment method for a mixed waste gas treatment device in synthetic leather production with high waste gas treatment efficiency and convenient for accurately controlling the waste gas flow rate, which is characterized by including the following steps:

[0015] 1). Waste gas flow control: After the concentration sensor detects and senses the concentration of DMF organic solvent substances in the waste gas at the inlet end of the waste gas inlet pipe in real time, it transmits an electrical signal to the main control board electrically connected to it. After receiving the electrical signal, the main control board determines the corresponding first fan operating speed instruction to the first fan according to the concentration of DMF organic solvent substances in the waste gas and the maximum total amount of DMF that can be treated in the absorption tower per unit time. The first fan works based on the received operating speed instruction to pump the waste gas into the absorption tower;

[0016] 2) Exhaust gas flow calibration: After the current energy consumption feedback module detects the current energy consumption of the first fan in real time, it feeds back the actual energy consumption on the first fan to the comparison module on the main control board. The comparison module compares the actual energy consumption of the first fan with the set energy consumption for controlling the rotation speed of the first fan issued by the main control board. When there is a difference between the actual energy consumption and the set energy consumption, the main control board generates a corresponding adjustment value and transmits it to the first fan for rotation speed calibration. After calibration, the current energy consumption feedback module continues to continuously monitor and feedback the actual energy consumption of the first fan. When the actual energy consumption is equal to the set energy consumption, the main control board sends an electrical signal to the current energy consumption feedback module, and the current energy consumption feedback module continues to continuously monitor and feedback the actual energy consumption of the first fan;

[0017] 3) Spray water volume control: After the first fan runs, the water pump runs at the maximum power. The flow sensor detects the actual flow rate of the exhaust gas introduced into the absorption tower per unit time inside the inlet exhaust pipe and feeds back this value to the main control board. Based on the actual exhaust gas flow rate value fed back on the main control board, it is compared with the required exhaust gas flow rate value obtained by comparing the DMF organic solvent substance concentration in the exhaust gas with the maximum total amount of DMF that can be processed per unit time inside the absorption tower. An electrical signal is sent to the water pump to lower the operating power of the water pump, so as to reduce the amount of water introduced to the spray head per unit time by the water pump, corresponding to the product of the actual exhaust gas flow rate value and the DMF organic solvent substance concentration in the exhaust gas;

[0018] 4) Exhaust gas treatment: After the exhaust gas enters the absorption tower, it passes through the spray of the spray layer from bottom to top, is led out from the top of the absorption tower, and then passes through the drying box and the recovery box for treatment, and is then discharged through the chimney.

[0019] The present invention is further configured as follows: In step (3), after the energy consumption power feedback module provided on the water pump detects the current energy consumption of the water pump in real time, it feeds back the actual energy consumption on the water pump to the comparison power module on the main control board. The comparison power module compares the actual energy consumption of the water pump with the set energy consumption for controlling the water pumping volume of the water pump issued by the main control board. When there is a difference between the actual energy consumption and the set energy consumption, the main control board generates a corresponding adjustment value and transmits it to the water pump for rotation speed calibration. After calibration, the comparison power module continues to continuously monitor and feedback the actual energy consumption of the water pump. When the actual energy consumption is equal to the set energy consumption, the main control board sends an electrical signal to the comparison power module, and the comparison power module continues to continuously monitor and feedback the actual energy consumption of the water pump.

[0020] By adopting the above technical solution, compared with the prior art, on the basis of realizing the control of the waste gas flow rate, the rotation speed of the first fan is adjusted according to the concentration of DMF organic solvent substances in the waste gas, so that the product of the waste gas flow rate and the concentration of DMF organic solvent substances in the waste gas reaches the maximum total amount of DMF treatment per unit time inside the absorption tower, thereby improving the overall waste gas treatment efficiency of the waste gas treatment device, reducing energy consumption and treatment cost; through the above-mentioned energy consumption detection and feedback calibration of the first fan, accurate control of the waste gas flow rate per unit time is ensured, so as to ensure that the incoming waste gas volume can be treated in the absorption tower and at the same time reach the maximum value that can be treated by the absorption tower per unit time, improving the waste gas treatment efficiency; according to the actual waste gas flow rate, the actual total amount of DMF in the waste gas treated inside the absorption tower is adjusted downward, corresponding to the product of the actual waste gas flow rate value and the concentration of DMF organic solvent substances in the waste gas. On the one hand, the energy consumption of the water pump is reduced, and on the other hand, unnecessary consumption of water volume is reduced; the power monitoring and calibration component is used to adjust its actual power in real time to reach the control output power of the main control board, further ensuring that the actual power of the water pump meets the requirement of the electrical signal sent by the main control board to control and reduce the operating power of the water pump, thereby avoiding unnecessary energy consumption and cost loss, and at the same time ensuring the waste gas treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the specific embodiment of the present invention.

[0023] Figure 2 It is a flow chart of the rotation speed control of the first fan in the specific embodiment of the present invention.

[0024] Figure 3 It is a flow chart of the water pumping control of the water pump in the specific embodiment of the present invention.

[0025] In the figure: The dotted line indicates electrical connection, and the solid line indicates material connection. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] As Figures 1 - 3 shown, the present invention discloses a mixed waste gas treatment device in synthetic leather production, which includes an absorption tower 1 and an exhaust gas inlet pipe 2 connected to the side wall of the absorption tower 1. A first fan 3 is connected in series on the exhaust gas inlet pipe 2. The top of the absorption tower 1 is connected to a drying box 5 through a first connecting pipe 4. One side of the drying box 5 away from the first connecting pipe 4 is connected to a chimney 7 through a second connecting pipe 6. A second fan 8 is connected in series on the second connecting pipe 6. A plurality of layers of breathable spraying layers are arranged in the absorption tower 1 at intervals from low to high. The bottom of the spraying layer is provided with a spray head 9, and the spray head 9 is connected to a water pipe 10. A water pump 11 is connected in series on the water pipe 10. A waste liquid recovery tank 12 is arranged at the bottom of the absorption tower 1. The waste liquid recovery tank 12 is connected to a waste liquid recovery box 14 through a recovery pipe 13. A recovery pump 15 is connected in series on the recovery pipe 13. It is characterized in that: a concentration sensor 21 for real-time detection of the concentration of DMF organic solvent substances in the waste gas is arranged at the inlet end of the exhaust gas inlet pipe 2. The concentration sensor 21 is electrically connected to a main control board 22 for receiving the electrical signal of the concentration of DMF organic solvent substances in the waste gas and controlling the rotation speed of the first fan 3 based on this concentration. The main control board 22 is electrically connected to a display 23 for digital display. The main control board 22 and the first fan 3 are electrically connected. A rotation speed monitoring and calibration component for real-time correction and adjustment to make its actual rotation speed reach the rotation speed controlled by the main control board 22 is electrically connected to the first fan 3.

[0028] By adopting the above technical solution, since the maximum total amount of DMF treatment in the absorption tower 1 per unit time for the waste gas remains unchanged, in order to maximize the treatment efficiency of the waste gas per unit time, a concentration sensor 21 is provided at the inlet end of the waste gas inlet pipe 2. After the concentration sensor 21 detects and senses the concentration of DMF organic solvent substances in the waste gas in real time, it transmits an electrical signal to the main control board 22 electrically connected thereto. After receiving the electrical signal, the main control board 22 issues a corresponding operating speed command for the first fan 3 to the first fan 3 according to the concentration of DMF organic solvent substances in the waste gas and the maximum total amount value of DMF that can be treated in the absorption tower 1 per unit time. The first fan 3 operates and adjusts its speed in real time according to the concentration of DMF organic solvent substances in the waste gas entering the waste gas inlet pipe 2, achieving the real-time adjustment and control effect of controlling the waste gas flow rate. The size of the waste gas flow rate decreases as the concentration of DMF organic solvent substances in the waste gas increases, and increases as the concentration of DMF organic solvent substances in the waste gas decreases. The inverse change ratio between the two is recorded in the main control board 22, and a corresponding speed size command is issued to the first fan 3 based on the electrical signal received from the concentration sensor 21. The first fan 3 operates and pumps waste gas with a corresponding flow rate into the absorption tower 1 for treatment. In order to adjust the actual operating speed of the first fan 3 in real time and improve the precise control of the waste gas flow rate per unit time, a speed detection and calibration component is electrically connected to the first fan 3, which is used to correct and adjust the actual speed of the first fan 3 to reach the speed controlled on the main control board 22, avoiding errors in the actual operating speed of the first fan 3 caused by losses in the circuit, which may affect the precise control of the waste gas flow rate entering per unit time. In order to facilitate the user to observe the waste gas flow rate and the corresponding concentration of DMF organic solvent substances in the waste gas in real time, the main control board 22 is electrically connected to a display 23 for digital display, which is used to display the corresponding values in real time through the display 23, so that the user can understand the state of waste gas treatment. Compared with the prior art, on the basis of realizing the control of the waste gas flow rate, the speed of the first fan 3 is adjusted according to the concentration of DMF organic solvent substances in the waste gas, so that the product of the waste gas flow rate and the concentration of DMF organic solvent substances in the waste gas reaches the maximum total amount of DMF treatment in the absorption tower 1 per unit time for the waste gas, thereby improving the overall waste gas treatment efficiency of the waste gas treatment device and reducing the energy consumption and treatment cost.

[0029] The present invention is further configured as follows: the speed detection and calibration component includes a current energy consumption feedback module 24 provided on the first fan 3 for detecting and feedbacking the current energy consumption of the first fan 3 in real time, and a comparison module 25 is provided on the main control board 22 for receiving the difference obtained by comparing the actual energy consumption feedbacked by the current energy consumption feedback module 24 with the set energy consumption of the speed controlled on the main control board 22 to determine and send an electrical signal to the first fan 3 to adjust the speed.

[0030] By adopting the above technical solution, after the current energy consumption feedback module 24 provided on the first fan 3 detects the current energy consumption of the first fan 3 in real time, the actual energy consumption on the first fan 3 is fed back to the comparison module 25 on the main control board 22. The comparison module 25 compares the actual energy consumption of the first fan 3 with the set energy consumption for controlling the rotation speed of the first fan 3 issued by the main control board 22. When the actual energy consumption is equal to the set energy consumption, the main control board 22 sends an electrical signal to the current energy consumption feedback module 24, and the current energy consumption feedback module 24 continues to continuously monitor and feedback the actual energy consumption of the first fan 3; when there is a difference between the actual energy consumption and the set energy consumption, the main control board 22 generates a corresponding adjustment value and transmits it to the first fan 3 for calibration of the rotation speed. After calibration, the current energy consumption feedback module 24 continues to continuously monitor and feedback the actual energy consumption of the first fan 3. Through the above energy consumption detection, feedback and calibration of the first fan 3, it is ensured that the exhaust gas flow rate per unit time is accurately controlled, so as to ensure that the incoming exhaust gas volume can be processed in the absorption tower 1, and at the same time reach the maximum value that the absorption tower 1 can process per unit time, improving the treatment efficiency of the exhaust gas.

[0031] The present invention is further arranged as follows: a flow sensor 26 for detecting the actual flow rate of the exhaust gas introduced into the absorption tower 1 per unit time and feeding it back to the main control board 22 is provided on the inner pipe wall of the waste gas inlet pipe 2 and between the first fan 3 and the absorption tower 1. The flow sensor 26 is electrically connected to the main control board 22, and the main control board 22 transmits an electrical signal to the water pump 11 to lower the operating power of the water pump 11 based on the actual exhaust gas flow rate fed back by the flow sensor 26.

[0032] By adopting the above technical solution, a flow sensor 26 is provided on the inner pipe wall of the waste gas inlet pipe 2 and between the first fan 3 and the absorption tower 1. After the first fan 3 operates, the water pump 11 operates at the maximum power. The flow sensor 26 is used to detect the actual flow rate of the exhaust gas introduced into the absorption tower 1 per unit time inside the waste gas inlet pipe 2 and feed back this value to the main control board 22. Based on the actual exhaust gas flow rate value fed back on the main control board 22, it is compared with the required exhaust gas flow rate value obtained by comparing the DMF organic solvent substance concentration in the exhaust gas with the maximum total amount of DMF that can be processed per unit time inside the absorption tower 1. An electrical signal is sent to the water pump 11 to lower the operating power of the water pump 11, so as to reduce the amount of water introduced per unit time by the water pump 11, thereby lowering the total amount value of DMF in the actually treated exhaust gas inside the absorption tower 1, corresponding to the product of the actual exhaust gas flow rate value and the DMF organic solvent substance concentration in the exhaust gas. On the one hand, the energy consumption of the water pump 11 is reduced, and on the other hand, the unnecessary consumption of water volume is reduced.

[0033] The present invention is further arranged as follows: a power monitoring and calibration component for real-time correction and adjustment of its actual power to reach the control output power of the main control board 22 is electrically connected to the water pump 11.

[0034] By adopting the above technical solution, in order to further ensure that the actual power of the water pump 11 meets the requirement of reducing the operating power of the water pump 11 controlled by the electrical signal issued by the main control board 22, thereby avoiding unnecessary energy consumption and cost loss, and at the same time ensuring the treatment effect of the waste gas, a power monitoring and calibration component for electrically connecting to the water pump 11 to real-time correct and adjust its actual power to reach the control output power of the main control board 22 is provided.

[0035] The present invention is further configured as: the power monitoring and calibration component includes an energy consumption power feedback module 27 provided on the water pump 11 for real-time detecting and feedbacking the current energy consumption of the water pump 11, and a comparison power module 28 is provided on the main control board 22 for receiving the difference obtained by comparing the actual energy consumption feedbacked by the energy consumption power feedback module 27 with the output energy consumption controlled on the main control board 22 to determine sending an electrical signal to the water pump 11 to adjust the output power of the water pump.

[0036] By adopting the above technical solution, after the energy consumption power feedback module 27 provided on the water pump 11 real-time detects the current energy consumption of the water pump 11, it feedbacks the actual energy consumption on the water pump 11 to the comparison power module 28 on the main control board 22. The comparison power module 28 compares the actual energy consumption of the water pump 11 with the set energy consumption for controlling the water pumping volume of the water pump 11 issued by the main control board 22. When the actual energy consumption is equal to the set energy consumption, the main control board 22 sends an electrical signal to the comparison power module 28, and the comparison power module 28 continues to continuously monitor and feedback the actual energy consumption of the water pump 11; when there is a difference between the actual energy consumption and the set energy consumption, the main control board 22 generates a corresponding adjustment value and transmits it to the water pump 11 for speed calibration. After calibration, the comparison power module 28 continues to continuously monitor and feedback the actual energy consumption of the water pump 11. Through the above energy consumption detection, feedback and calibration of the water pump 11, it is ensured that the actual power of the water pump 11 meets the requirement of reducing the operating power of the water pump 11 controlled by the electrical signal issued by the main control board 22, avoiding unnecessary energy consumption and cost loss, and ensuring the treatment effect of the waste gas.

[0037] The present invention also discloses a treatment method for a mixed waste gas treatment device in synthetic leather production with high waste gas treatment efficiency and convenient for accurately controlling the waste gas flow rate, which is characterized by including the following steps:

[0038] 1) Waste gas flow control: After the concentration sensor 21 real-time detects and senses the concentration of DMF organic solvent substances in the waste gas at the inlet end of the waste gas inlet pipe 2, it transmits an electrical signal to the main control board 22 electrically connected thereto. After receiving the electrical signal, the main control board 22 determines to issue a corresponding operating speed instruction for the first fan 3 to the first fan 3 according to the concentration of DMF organic solvent substances in the waste gas and the maximum total amount of DMF that can be treated in the absorption tower 1 per unit time. The first fan 3 operates based on the received operating speed instruction to pump the waste gas into the absorption tower 1.

[0039] 2) Exhaust gas flow calibration: After the current energy consumption feedback module 24 detects the current energy consumption of the first fan 3 in real time, it feeds back the actual energy consumption on the first fan 3 to the comparison module 25 on the main control board 22. The comparison module 25 compares the actual energy consumption of the first fan 3 with the set energy consumption for controlling the rotation speed of the first fan 3 issued by the main control board 22. When there is a difference between the actual energy consumption and the set energy consumption, the main control board 22 generates a corresponding adjustment value and transmits it to the first fan 3 for rotation speed calibration. After calibration, the current energy consumption feedback module 24 continues to continuously monitor and feedback the actual energy consumption of the first fan 3. When the actual energy consumption is equal to the set energy consumption, the main control board 22 sends an electrical signal to the current energy consumption feedback module 24, and the current energy consumption feedback module 24 continues to continuously monitor and feedback the actual energy consumption of the first fan 3;

[0040] 3) Spray water volume control: After the first fan 3 runs, the water pump 11 operates at maximum power. The flow sensor 26 detects the actual flow rate of the exhaust gas introduced into the absorption tower 1 per unit time into the waste gas inlet pipe 2 and feeds back this value to the main control board 22. Based on the actual exhaust gas flow rate value fed back on the main control board 22, it is compared with the required exhaust gas flow rate value obtained by comparing the DMF organic solvent substance concentration in the exhaust gas with the maximum total amount of DMF that can be processed per unit time inside the absorption tower 1. An electrical signal is sent to the water pump 11 to lower the operating power of the water pump 11, so as to reduce the amount of water introduced into the spray head 9 per unit time by the water pump 11, corresponding to the product of the actual exhaust gas flow rate value and the DMF organic solvent substance concentration in the exhaust gas;

[0041] 4) Exhaust gas treatment: After the exhaust gas enters the absorption tower 1, it passes through the spray of the spray layer from bottom to top, is led out from the top of the absorption tower 1, and then passes through the drying box 5 and the recovery box 16 for treatment, and is then discharged through the chimney 7.

[0042] The present invention is further arranged as follows: In step (3), after the energy consumption power feedback module 27 provided on the water pump 11 detects the current energy consumption of the water pump 11 in real time, it feeds back the actual energy consumption on the water pump 11 to the comparison power module 28 on the main control board 22. The comparison power module 28 compares the actual energy consumption of the water pump 11 with the set energy consumption for controlling the water pumping volume of the water pump 11 issued by the main control board 22. When there is a difference between the actual energy consumption and the set energy consumption, the main control board 22 generates a corresponding adjustment value and transmits it to the water pump 11 for rotation speed calibration. After calibration, the comparison power module 28 continues to continuously monitor and feedback the actual energy consumption of the water pump 11. When the actual energy consumption is equal to the set energy consumption, the main control board 22 sends an electrical signal to the comparison power module 28, and the comparison power module 28 continues to continuously monitor and feedback the actual energy consumption of the water pump 11.

[0043] By adopting the above technical solution, compared with the prior art, on the basis of realizing the control of the exhaust gas flow rate, the rotation speed of the first fan 3 is adjusted according to the concentration of DMF organic solvent substances in the exhaust gas, so that the product of the exhaust gas flow rate and the concentration of DMF organic solvent substances in the exhaust gas reaches the maximum total amount of DMF treatment per unit time inside the absorption tower 1 for the exhaust gas, thereby improving the overall treatment efficiency of the exhaust gas treatment device, reducing the energy consumption and treatment cost; through the above energy consumption detection and feedback calibration of the first fan 3, the exhaust gas flow rate per unit time can be accurately controlled to ensure that the incoming exhaust gas volume can be treated in the absorption tower 1 and reach the maximum value that can be treated by the absorption tower 1 per unit time, improving the treatment efficiency of the exhaust gas; according to the actual exhaust gas flow rate, the actual total amount of DMF in the exhaust gas treated inside the absorption tower 1 is reduced, corresponding to the product of the actual exhaust gas flow rate value and the concentration of DMF organic solvent substances in the exhaust gas. On the one hand, the energy consumption of the water pump 11 is reduced, and on the other hand, the unnecessary consumption of water volume is reduced; the power monitoring and calibration component is used to correct and adjust its actual power in real time to reach the control output power of the main control board 22, further ensuring that the actual power of the water pump 11 meets the requirement of the electric signal issued by the main control board 22 to control and reduce the operating power of the water pump 11, thereby avoiding unnecessary energy consumption and cost loss, and at the same time ensuring the treatment effect of the exhaust gas.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An apparatus for treating mixed waste gas in synthetic leather production, comprising an absorption tower (1) and an exhaust gas inlet pipe (2) connected to the side wall of the absorption tower (1). A first fan (3) is connected in series on the exhaust gas inlet pipe (2). The top of the absorption tower (1) is connected to a drying box (5) through a first connecting pipe (4). One side of the drying box (5) away from the first connecting pipe (4) is connected to a recovery box (16) through a second connecting pipe (6). One side of the recovery box (16) away from the second connecting pipe (6) is connected to a chimney (7) through a third connecting pipe (17). A second fan (8) is connected in series on the third connecting pipe (17). A number of breathable spray layers are spaced from low to high in the absorption tower (1). Spray heads (9) are installed at the bottoms of the spray layers. The spray heads (9) are connected to a water pipe (10). A water pump (11) is connected in series on the water pipe (10). A waste liquid recovery tank (12) is provided at the bottom of the absorption tower (1). The waste liquid recovery tank (12) is connected to a waste liquid recovery box (14) through a recovery pipe (13). It is characterized in that: A concentration sensor (21) for real-time detection of the concentration of DMF organic solvent substances in the waste gas is provided at the inlet end of the intake and exhaust pipe (2). The concentration sensor (21) is electrically connected to a main control board (22) for receiving the electrical signal of the concentration of DMF organic solvent substances in the waste gas and controlling the rotation speed of the first fan (3) based on this concentration. The main control board (22) is electrically connected to a display (23) for digital display. The main control board (22) is electrically connected to the first fan (3). A rotation speed detection and calibration component is electrically connected to the first fan (3) for real-time correction and adjustment to make its actual rotation speed reach the rotation speed controlled by the main control board (22); The rotation speed detection and calibration component includes a current energy consumption feedback module (24) provided on the first fan (3) for real-time detection and feedback of the current energy consumption of the first fan (3). A comparison module (25) is provided on the main control board (22) for receiving the difference obtained by comparing the actual energy consumption fed back by the current energy consumption feedback module (24) with the set energy consumption of the rotation speed controlled on the main control board (22) to determine and send an electrical signal to the first fan (3) to adjust the rotation speed; A flow sensor (26) for detecting the actual flow rate of the waste gas introduced into the absorption tower (1) per unit time and feeding it back to the main control board (22) is provided on the inner wall of the intake and exhaust pipe (2) between the first fan (3) and the absorption tower (1). The flow sensor (26) is electrically connected to the main control board (22). The main control board (22) transmits an electrical signal to the water pump (11) based on the actual waste gas flow rate fed back by the flow sensor (26) to reduce the operating power of the water pump (11); A power monitoring and calibration component is electrically connected to the water pump (11) for real-time correction and adjustment to make its actual power reach the output power controlled by the main control board (22); The power monitoring and calibration component includes an energy consumption power feedback module (27) provided on the water pump (11) for real-time detection and feedback of the current energy consumption of the water pump (11). A comparison power module (28) is provided on the main control board (22) for receiving the difference obtained by comparing the actual energy consumption fed back by the energy consumption power feedback module (27) with the output energy consumption controlled on the main control board (22) to determine and send an electrical signal to the water pump (11) to adjust the output power of the water pump; 2. A treatment method suitable for the treatment device of mixed waste gas in the production of synthetic leather described in the above-mentioned claim 1, characterized in that, It includes the following steps: 1). Waste gas flow control: After the concentration sensor (21) real-time detects and senses the concentration of DMF organic solvent substances in the waste gas at the inlet end of the intake and exhaust pipe (2), it transmits an electrical signal to the main control board (22) electrically connected to it. After receiving the electrical signal, the main control board (22) determines and issues a corresponding rotation speed command for the first fan (3) to the first fan (3) according to the concentration of DMF organic solvent substances in the waste gas and the maximum total amount of DMF that can be processed in the absorption tower (1) per unit time. The first fan (3) works based on the received rotation speed command to pump the waste gas into the absorption tower (1); 2) Exhaust gas flow calibration: After the current energy consumption feedback module (24) detects the current energy consumption of the first fan (3) in real time, it feeds back the actual energy consumption on the first fan (3) to the comparison module (25) on the main control board (22). The comparison module (25) compares the actual energy consumption of the first fan (3) with the set energy consumption for controlling the rotation speed of the first fan (3) issued by the main control board (22). When there is a difference between the actual energy consumption and the set energy consumption, the main control board (22) generates a corresponding adjustment value and transmits it to the first fan (3) for rotation speed calibration. After calibration, the current energy consumption feedback module (24) continues to continuously monitor and feedback the actual energy consumption of the first fan (3). When the actual energy consumption is equal to the set energy consumption, the main control board (22) sends an electrical signal to the current energy consumption feedback module (24), and the current energy consumption feedback module (24) continues to continuously monitor and feedback the actual energy consumption of the first fan (3). 3) Spray water volume control: After the first fan (3) runs, the water pump (11) operates at maximum power. The flow sensor (26) detects the actual flow rate of the exhaust gas entering the waste gas inlet pipe (2) per unit time into the absorption tower (1) and feeds back this value to the main control board (22). Based on the actual exhaust gas flow rate value fed back on the main control board (22), it is compared with the required exhaust gas flow rate value obtained by comparing the maximum total amount of DMF that can be processed per unit time inside the absorption tower (1) with the DMF organic solvent substance concentration in the exhaust gas. An electrical signal is sent to the water pump (11) to lower the operating power of the water pump (11), so as to reduce the amount of water flowing into the spray head (9) per unit time by the water pump (11), corresponding to the product of the actual exhaust gas flow rate value and the DMF organic solvent substance concentration in the exhaust gas. 4) Exhaust gas treatment: After the exhaust gas enters the absorption tower (1), it passes through the spray of the spray layer from bottom to top, is led out from the top of the absorption tower (1), and then passes through the drying box (5) and the recovery box (16) for treatment, and is then discharged through the chimney (7).

3. The treatment method of the mixed waste gas treatment device in synthetic leather production according to claim 2, characterized in that: In step (3), after the energy consumption power feedback module (27) set on the water pump (11) detects the current energy consumption of the water pump (11) in real time, it feeds back the actual energy consumption on the water pump (11) to the comparison power module (28) on the main control board (22). The comparison power module (28) compares the actual energy consumption of the water pump (11) with the set energy consumption for controlling the water pumping volume of the water pump (11) issued by the main control board (22). When there is a difference between the actual energy consumption and the set energy consumption, the main control board (22) generates a corresponding adjustment value and transmits it to the water pump (11) for rotation speed calibration. After calibration, the comparison power module (28) continues to continuously monitor and feedback the actual energy consumption of the water pump (11). When the actual energy consumption is equal to the set energy consumption, the main control board (22) sends an electrical signal to the comparison power module (28), and the comparison power module (28) continues to continuously monitor and feedback the actual energy consumption of the water pump (11).

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