PLC-based flue gas treatment energy-saving system

Abstract

The utility model provides a flue gas treatment energy-saving system based on a PLC (Programmable Logic Controller), which solves the problems of high energy consumption and resource waste when the existing flue gas treatment energy-saving system is shared by a plurality of vulcanizing machines. Comprising a main induced draft fan and a flue gas pipeline used for conveying flue gas, the main induced draft fan is connected with the flue gas pipeline, and the main induced draft fan comprises a main induced draft fan frequency converter; the system further comprises a vulcanizing machine electric control cabinet and a PLC, the vulcanizing machine electric control cabinet is electrically connected with the input end of the PLC, and the output end of the PLC is electrically connected with the main induced draft fan frequency converter. The input end of the PLC is further electrically connected with a negative feedback adjusting module used for comparing data of the PLC. The device is widely applied to the technical field of flue gas treatment in the tire industry.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas treatment in the tire industry, and more specifically, to a flue gas treatment energy-saving system based on PLC. Background Art

[0002] Tire vulcanization is a key process in tire production, which usually refers to the vulcanization of the tire embryo in the mold under high temperature and high pressure by the vulcanizer. The vulcanizer causes the rubber to undergo a chemical reaction by heating and pressurizing to form a characteristic cross-linked structure. This process produces a large amount of VOCS-containing vulcanization fume, which is discharged at the mold opening stage at the end of vulcanization. The chemical composition of the vulcanization fume is relatively complex, including benzene series, lipids, organic solvents and a small amount of hydrogen sulfide. Direct discharge will cause serious environmental pollution, so the vulcanization fume needs to be recovered and treated.

[0003] In actual production, each vulcanization ditch includes 30-40 vulcanizers. Multiple vulcanizers share a flue gas treatment system. The flue gas generated by each vulcanizer is collected by a flue gas collection hood and aggregated to the flue gas main line. The main induced draft fan provides negative pressure to the flue gas main line and transports the vulcanization flue gas to the flue gas treatment equipment for purification and discharge.

[0004] At present, in order to ensure the collection effect of vulcanizing fume, the main induced draft fan has been running at full load. However, after multiple vulcanizers are operated in batches, the operation time of each vulcanizer is inconsistent and the start time of each vulcanizer is different. When the number of vulcanizers turned on is small, the main induced draft fan cannot realize automatic frequency conversion operation and still maintains full load operation, resulting in large power consumption and serious energy waste. Therefore, under the premise of ensuring the exhaust demand of the vulcanizer and the fume collection effect, it is urgent to solve the problem of high energy consumption of the fume treatment system. Utility Model Content

[0005] In order to solve the above existing problems, the technical solution adopted by the utility model is: to provide a flue gas treatment energy-saving system based on PLC, to realize automatic frequency conversion of the main induced draft fan through the PLC control module, to solve the problem of high energy consumption of the existing flue gas treatment system, including a main induced draft fan and a flue gas duct for conveying flue gas, the main induced draft fan is connected to the flue gas duct, and the main induced draft fan includes a main induced draft fan frequency converter;

[0006] It also includes a vulcanizing machine electrical control cabinet and a PLC controller. The vulcanizing machine electrical control cabinet is electrically connected to the input end of the PLC controller, and the output end of the PLC controller is electrically connected to the main induced draft fan frequency converter; the input end of the PLC controller is also electrically connected to a negative feedback adjustment module for comparing PLC controller data.

[0007] Preferably, the negative feedback regulation module comprises a terminal pipeline negative pressure gauge arranged on the flue gas duct, and the terminal pipeline negative pressure gauge is electrically connected to the input end of the PLC controller.

[0008] Preferably, the output end of the PLC controller is electrically connected to a control air valve for starting the main induced draft fan.

[0009] Preferably, the start time of the PLC controller output to the control air valve is set to 40 seconds before the vulcanization mold is opened.

[0010] Preferably, the operating time output by the PLC controller to control the air valve is set to 200-400s.

[0011] Preferably, there are multiple electrical control cabinets for the vulcanizer, and all of the electrical control cabinets for the vulcanizer are electrically connected to the input end of the PLC controller for collecting the mold opening signal of the vulcanizer.

[0012] Preferably, the input end of the flue gas duct is connected to a flue gas collection hood, and the output end is connected to a flue gas treatment device for purifying the flue gas.

[0013] Preferably, the PLC controller is arranged on a main control cabinet, and the main control cabinet is also provided with a human-machine operation interface electrically connected to the PLC controller, and the human-machine operation interface is used to display data of the PLC controller.

[0014] The beneficial effects of the utility model are as follows: the vulcanizer electrical control cabinet is electrically connected to the input end of the PLC controller, and the mold opening signal of the vulcanizer electrical control cabinet is output to the PLC controller. The PLC controller calculates the corresponding main induced draft fan operating frequency according to the mold opening signal, and outputs the operating frequency data to the main induced draft fan inverter for adjustment, thereby ensuring that the operating frequency of the main induced draft fan always corresponds to the number of mold openings of the vulcanizer electrical control cabinet, and automatically adjusts the operating frequency of the main induced draft fan according to the number of mold openings of the vulcanizer electrical control cabinet, thereby reducing the power consumption of the main induced draft fan operation, reducing unnecessary energy waste, and reducing the cost of flue gas treatment, and is suitable for multiple vulcanizers to share a flue gas treatment system. At the same time, the negative feedback adjustment module ensures that the actual operating frequency of the main induced draft fan is always slightly greater than the set data, and forms a closed loop with the vulcanizer electrical control cabinet and the PLC controller, thereby ensuring the stability of the actual operating frequency of the main induced draft fan and improving the efficiency of flue gas collection. The entire system equipment is simple, convenient, and has a high degree of automation and safety, reducing labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Explanation of symbols in the figure: 1. Main induced draft fan inverter; 2. Vulcanizer electrical control cabinet; 3. PLC controller; 4. Terminal pipeline negative pressure gauge. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0020] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] A PLC-based flue gas treatment energy-saving system provided in an embodiment of the present application is now described.

[0022] See also Figure 1 , which is a structural schematic diagram of the utility model, a PLC-based flue gas treatment energy-saving system, includes a main induced draft fan and a flue gas duct for conveying flue gas, the main induced draft fan is connected to the flue gas duct, and the main induced draft fan is operated to allow the flue gas exhausted by the vulcanizer to enter the flue gas duct.

[0023] The flue gas treatment energy-saving system also includes a vulcanizer electrical control cabinet 2 and a PLC controller 3. The number of vulcanizer electrical control cabinets 2 can be multiple. The vulcanizer electrical control cabinet 2 is electrically connected to the input end of the PLC controller 3 for collecting the mold opening signal of the vulcanizer; the main induced draft fan includes a main induced draft fan frequency converter 1, and the output end of the PLC controller 3 is electrically connected to the main induced draft fan frequency converter 1; when the vulcanization process is completed, the main induced draft fan is operated, and the flue gas enters the flue gas duct. The vulcanizer electrical control cabinet 2 outputs the mold opening signal to the input end of the PLC controller 3. According to the number of mold openings of the vulcanizer, the calculation module of the PLC controller 3 calculates the corresponding main induced draft fan operating frequency, and outputs the operating frequency data to the main induced draft fan frequency converter 1. The main induced draft fan frequency converter 1 is adjusted to the frequency corresponding to the set data, which not only ensures the flue gas collection effect on the mold opening vulcanizer, but also avoids the main induced draft fan from continuously running at full load, thereby reducing power consumption.

[0024] The input end of the PLC controller 3 is also electrically connected to a negative feedback regulation module for comparing the data of the PLC controller 3. The negative feedback regulation module collects actual data of the main induced draft fan operation and compares it with the set data calculated by the PLC controller 3, and further adjusts the main induced draft fan inverter 1 so that the operating frequency of the main induced draft fan inverter 1 is always slightly greater than the set data, so as to improve the smoke collection efficiency and ensure the stability of the actual operating frequency of the main induced draft fan.

[0025] Furthermore, the negative feedback regulation module includes a terminal pipeline negative pressure meter 4 arranged on the flue gas duct, which can display the negative pressure value of the flue gas duct in real time, and is electrically connected to the input end of the PLC controller 3. The main induced draft fan inverter 1 provides negative pressure to the flue gas duct, and the terminal pipeline negative pressure meter 4 outputs the negative pressure signal to the PLC controller 3, and compares the actual data of the main induced draft fan operation with the set data calculated by the PLC controller 3: if the actual data is less than the set data, the PLC controller 3 increases the frequency of the main induced draft fan inverter 1 so that the actual data is greater than the set data; if the actual data is greater than the set data, it operates normally, and the PLC controller 3, the main induced draft fan inverter 1, and the negative feedback regulation module form a closed loop.

[0026] In one embodiment, the output end of the PLC controller 3 is electrically connected to the control air valve used to start the main induced draft fan, so as to realize the automatic control of the start and delay of the main induced draft fan. Furthermore, the start time of the PLC controller 3 output to the control air valve is set to 40s before the vulcanization mold opening, and the running time of the PLC controller 3 output to the control air valve is set to 200-400s to ensure the effect of smoke collection. When the vulcanization process is completed, the vulcanizer electrical control cabinet 2 outputs the mold opening signal to the input end of the PLC controller 3, and the PLC controller 3 outputs the mold opening signal to the control air valve, starts the control air valve 40s before the vulcanization mold opening, ensures that the control air valve starts normally, and delays 200-400s after the control air valve starts to ensure that the vulcanization smoke is fully collected, thereby improving the smoke collection effect; at the same time, according to the number of mold openings of the vulcanizer, the calculation module of the PLC controller 3 calculates the corresponding main induced draft fan operating frequency, and outputs the operating frequency data to the main induced draft fan inverter 1 for adjustment. It realizes automatic start-up and control of the air valve without the need for staff operation, has a high degree of automation, reduces power consumption, improves the flue gas recovery efficiency, and reduces the flue gas recovery cost.

[0027] In one embodiment, the input end of the flue gas pipeline is connected to a flue gas collection hood, and the output end is connected to a flue gas treatment device for purifying the flue gas. Under the action of the main induced draft fan, the sulfide flue gas enters the flue gas pipeline through the flue gas collection hood, is transported to the flue gas treatment device for purification, and then discharged.

[0028] In one embodiment, the PLC controller 3 is disposed on a main control cabinet, and a human-machine operation interface electrically connected to the PLC controller 3 is also disposed on the main control cabinet, and the human-machine operation interface is used to display data of the PLC controller 3 .

[0029] Furthermore, an operating program is provided in the PLC controller 3, and the human-machine operating interface can also be used to set the data of the PLC controller 3. When the calculation module of the PLC controller 3 fails and cannot calculate the data, the staff can directly set the operating frequency data of the main induced draft fan inverter 1 through the human-machine operating interface.

[0030] The working process of the utility model is as follows: the vulcanizer electric control cabinet 2 collects the mold opening signal of the vulcanizer and outputs it to the PLC controller 3, the PLC controller 3 starts the control valve, and the main induced draft fan runs; at the same time, the PLC controller 3 calculates the corresponding main induced draft fan operating frequency according to the number of mold opening signals, and outputs the operating frequency data to the main induced draft fan frequency converter 1 for adjustment; the terminal pipeline negative pressure meter 4 outputs the negative pressure signal to the PLC controller 3, and compares the actual data of the main induced draft fan operation with the set data calculated by the PLC controller 3. If the actual data is less than the set data, the PLC controller 3 increases the frequency of the main induced draft fan frequency converter 1 to make the actual data always greater than the set data.

[0031] In the present utility model, the vulcanizer electrical control cabinet 2 is electrically connected to the input end of the PLC controller 3, and the mold opening signal of the vulcanizer electrical control cabinet 2 is output to the PLC controller 3. The PLC controller 3 calculates the corresponding main induced draft fan operating frequency according to the mold opening signal, and outputs the operating frequency data to the main induced draft fan inverter 1 for adjustment, thereby ensuring that the operating frequency of the main induced draft fan always corresponds to the number of mold openings of the vulcanizer electrical control cabinet 2, and automatically adjusts the operating frequency of the main induced draft fan according to the number of mold openings of the vulcanizer electrical control cabinet 2, thereby reducing the power consumption of the main induced draft fan operation, reducing unnecessary energy waste, and reducing the cost of flue gas treatment, and is suitable for multiple vulcanizers to share a flue gas treatment system. At the same time, the negative feedback adjustment module ensures that the actual operating frequency of the main induced draft fan is always slightly greater than the set data, and forms a closed loop with the vulcanizer electrical control cabinet 2 and the PLC controller 3, thereby ensuring the stability of the actual operating frequency of the main induced draft fan and improving the efficiency of flue gas collection. The entire system equipment is simple, convenient, and has a high degree of automation and safety, reducing labor costs.

[0032] The above-mentioned specific implementation methods do not cover the entire protection scope of the utility model. Modifications or equivalent replacements of the utility model should all fall within the patent coverage requirements of the utility model. In the utility model, the above-mentioned embodiments are only used to illustrate the technical solution of the present application, rather than to limit it; although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above-mentioned embodiments, or replace some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A PLC-based flue gas treatment energy-saving system, comprising a main induced draft fan and a flue gas duct for conveying flue gas, wherein the main induced draft fan is connected to the flue gas duct, and the main induced draft fan comprises a main induced draft fan frequency converter (1); characterized in that: It also comprises a vulcanizing machine electrical control cabinet (2) and a PLC controller (3), wherein the vulcanizing machine electrical control cabinet (2) is electrically connected to an input end of the PLC controller (3), and an output end of the PLC controller (3) is electrically connected to the main induced draft fan frequency converter (1); the input end of the PLC controller (3) is also electrically connected to a negative feedback regulation module for comparing data of the PLC controller (3).

2. A PLC-based flue gas treatment energy-saving system according to claim 1, characterized in that: The negative feedback regulation module comprises a terminal pipeline negative pressure gauge (4) arranged on the flue gas duct, and the terminal pipeline negative pressure gauge (4) is electrically connected to the input end of the PLC controller (3).

3. A PLC-based flue gas treatment energy-saving system according to claim 1, characterized in that: The output end of the PLC controller (3) is electrically connected to a control air valve used to start the main induced draft fan.

4. A PLC-based flue gas treatment energy-saving system as claimed in claim 3, characterized in that: The start time output by the PLC controller (3) to the control air valve is set to 40 seconds before the vulcanization mold is opened.

5. A PLC-based flue gas treatment energy-saving system according to claim 4, characterized in that: The operating time output by the PLC controller (3) to the control air valve is set to 200-400 seconds.

6. A PLC-based flue gas treatment energy-saving system according to claim 1, characterized in that: There are a plurality of vulcanizing machine electrical control cabinets (2), and each of the vulcanizing machine electrical control cabinets (2) is electrically connected to an input end of the PLC controller (3) for collecting a mold opening signal of the vulcanizing machine.

7. A PLC-based flue gas treatment energy-saving system according to claim 1, characterized in that: The input end of the flue gas pipeline is connected to a flue gas collecting hood, and the output end is connected to a flue gas treatment device for purifying the flue gas.

8. The PLC-based flue gas treatment energy-saving system according to claim 1, characterized in that: The PLC controller (3) is arranged on a main control cabinet, and the main control cabinet is also provided with a human-machine operation interface electrically connected to the PLC controller (3), wherein the human-machine operation interface is used to display data of the PLC controller (3).

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