Box-type furnace waste gas ignition device and box-type furnace

Abstract

The utility model belongs to the technical field of box-type furnaces, and provides a box-type furnace waste gas ignition device and a box-type furnace. The ignition device comprises a waste gas sensor, a burner sensor, a high-voltage ignition bag and a PLC (Programmable Logic Controller) which are matched with one another; the waste gas sensor, the burner sensor and the high-pressure ignition bag are all arranged on the peripheral side of a waste gas discharge port; wherein the waste gas sensor is used for monitoring whether waste gas is discharged from the waste gas discharge port or not, and the burner sensor is used for monitoring whether flames exist in the waste gas discharge port or not; the PLC controller comprises a signal input end and a signal output end; wherein the signal input end is respectively in communication connection with the waste gas sensor and the burner sensor, and the signal output end is in communication connection with the high-voltage ignition package. The box-type furnace comprises the ignition device. The waste gas treatment device has the advantage of energy conservation in the waste gas treatment process.

Description

Technical Field

[0001] The utility model relates to the technical field of box-type furnaces, and in particular to a box-type furnace exhaust gas ignition device and a box-type furnace. Background Art

[0002] Box-type furnaces are widely used in heat treatments such as sintering, annealing, and quenching of various materials due to their compact structure, high heating efficiency, and ease of use. Among them, since waste gas is generated during heat treatment in box-type furnaces, it pollutes the environment or creates corresponding safety hazards; therefore, waste gas generated during heat treatment should also be treated accordingly.

[0003] A common method of treating waste gas in existing box-type furnaces is combustion treatment, that is, an ignition device including an igniter and an external fuel is set at the waste gas discharge port of the box-type furnace. Specifically, the igniter ignites the external fuel to burn, and then ignites the discharged waste gas to burn together; thereby converting harmful waste gas into relatively safe components through oxidation-reduction reactions. In the actual process, it can be found that there are flames in two directions at the waste gas discharge port, one is a flame burning vertically upward, and the other is a flame burning sideways. Specifically, the flame burning vertically upward is the flame generated by the combustion of waste gas, and the flame burning sideways is the flame generated by the combustion of external fuel.

[0004] However, the inventors found that in the existing waste gas combustion treatment method, the ignition device is in a continuous ignition state, but there is often a situation where only the flame burns sideways, that is, sometimes there is no waste gas discharge, but the ignition device is still working continuously; thus causing a large amount of waste of external fuel. Specifically, the external fuel is often liquefied gas. The inventors found that in a full year, when a box-type furnace processes more than 9 million products, the corresponding consumption of liquefied gas costs as high as nearly 400,000 yuan. Utility Model Content

[0005] The utility model aims to provide a box-type furnace exhaust gas ignition device and a box-type furnace, so as to improve the technical problem that in the current box-type furnace exhaust gas treatment process, the operation mode of the ignition device causes a large amount of waste of external fuel such as liquefied gas.

[0006] In order to achieve the above purpose, the utility model proposes the following technical solutions:

[0007] In the first aspect, the technical solution provides a box-type furnace exhaust gas ignition device, including an exhaust gas sensor, a burner sensor, a high-voltage ignition package and a PLC controller that cooperate with each other;

[0008] The exhaust gas sensor, the burner sensor and the high-voltage ignition package are all arranged around the exhaust gas discharge port; wherein the exhaust gas sensor is used to monitor whether there is exhaust gas discharged from the exhaust gas discharge port, and the burner sensor is used to monitor whether there is a flame at the exhaust gas discharge port;

[0009] The PLC controller includes a signal input terminal and a signal output terminal; wherein the signal input terminal is respectively connected to the exhaust gas sensor and the burner sensor for communication, and the signal output terminal is connected to the high-voltage ignition package for communication; wherein, when the exhaust gas sensor detects exhaust gas discharge and the burner sensor detects no flame, and the signals detected by them are simultaneously written into the signal input terminal, the PLC controller transmits the ignition signal to the high-voltage ignition package; when the burner sensor detects the presence of flame and rewrites the signal detected by it into the signal input terminal, the PLC controller transmits the ignition shutdown signal to the high-voltage ignition package.

[0010] Furthermore, the burner sensor is arranged adjacent to the high-voltage ignition package.

[0011] Furthermore, the model of the PLC controller is: FX1S-10MR.

[0012] Furthermore, the Y0 pin of the PLC controller is the ignition control position of the high-voltage ignition package, the Y1 pin is the solenoid valve control position of the liquefied gas, and the Y2 pin is the flame monitoring position.

[0013] Furthermore, the model of the exhaust gas sensor is IFW 15-T.

[0014] Furthermore, pin 1 of the exhaust gas sensor is a power input position, pin 2 is a neutral line position, pin 3 is an exhaust gas signal input position, and pins 6 and 7 are exhaust gas signal output positions.

[0015] Furthermore, the model of the burner sensor is: IFW 15-T.

[0016] Furthermore, pin 1 of the burner sensor is the power input position, pin 2 is the neutral line position, pin 3 is the flame signal input position, 4 is the ground position, and pins 6 and 7 are the flame signal output positions.

[0017] Furthermore, it includes an alarm; the alarm is communicatively connected with the PLC controller.

[0018] In a second aspect, the technical solution provides a box-type furnace, comprising the ignition device described above.

[0019] Beneficial effects:

[0020] The technical solution improves the waste gas ignition device of the existing box-type furnace to solve the technical defect of energy waste in the current waste gas combustion treatment.

[0021] In order to achieve the above technical purpose, the ignition device is provided to include an exhaust gas sensor, a burner sensor, a high-voltage ignition package and a PLC controller that cooperate with each other. Specifically, the exhaust gas sensor, the burner sensor and the high-voltage ignition package are all arranged around the exhaust gas discharge port; wherein the exhaust gas sensor is used to monitor whether there is exhaust gas discharged from the exhaust gas discharge port, and the burner sensor is used to monitor whether there is a flame at the exhaust gas discharge port. The PLC controller includes a signal input terminal and a signal output terminal; wherein the signal input terminal is respectively connected to the exhaust gas sensor and the burner sensor for communication, and the signal output terminal is connected to the high-voltage ignition package for communication.

[0022] Specifically, when the exhaust gas sensor detects exhaust gas discharge and the burner sensor detects the absence of flame, and the signals detected by them are simultaneously written into the signal input end, the PLC controller transmits the ignition signal to the high-voltage ignition package; when the burner sensor detects the presence of flame and rewrites the signal detected by it into the signal input end, the PLC controller transmits the ignition shutdown signal to the high-voltage ignition package.

[0023] At this time, based on the mutual communication and interaction among the PLC controller, the exhaust gas sensor and the burner sensor, the high-voltage ignition package ignites only when there is exhaust gas but no flame, and the continuous operation of the ignition device is changed to intermittent operation when the actual situation requires, thereby greatly saving the consumption of corresponding external fuel.

[0024] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0025] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the teachings of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings, in which:

[0027] Figure 1 This is a circuit diagram of the box-type furnace exhaust gas ignition device described in this embodiment. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with general skills in the field to which the utility model belongs.

[0029] The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and other similar words do not indicate a quantity limitation, but indicate the existence of at least one. "Include" or "comprise" and other similar words mean that the elements or objects appearing before "include" or "comprise" include the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In order to process the exhaust gas discharged from the box-type furnace to avoid unnecessary safety hazards to the environment or people in its working area, it is often necessary to install an ignition device at the exhaust gas discharge port, so that the exhaust gas can be ignited by the combustion of external fuels such as liquefied gas and methane in the igniter for complete combustion, and the harmful gas can be converted into relatively safe components. However, in the existing waste gas treatment process of this type, since the ignition device is in a continuous ignition state, it often happens that there is no exhaust gas discharged from the exhaust gas discharge port of the box-type furnace, but the ignition device is still in a continuous working state; thus causing a large amount of external fuel waste. Based on this, the present embodiment aims to provide a box-type furnace exhaust gas ignition device, which changes the working mode of the existing ignition device, and thus has important value in saving ignition fuels such as external fuels.

[0031] The box-type furnace exhaust gas ignition device disclosed in the utility model is further specifically introduced below in conjunction with the embodiments shown in the accompanying drawings.

[0032] like Figure 1 As shown, the ignition device includes an exhaust gas sensor, a burner sensor, a high-voltage ignition package and a PLC controller that cooperate with each other.

[0033] In terms of specific functions, the exhaust gas sensor is used to monitor whether there is exhaust gas discharged from the exhaust gas outlet, and the burner sensor is used to monitor whether there is a flame at the exhaust gas outlet. Based on this, the exhaust gas sensor and the burner sensor are both arranged around the exhaust gas outlet; at this time, the exhaust gas discharged and whether there is a flame can be effectively monitored.

[0034] The high-pressure ignition package is used to burn external fuel to ignite the exhaust gas, so it is also arranged to be located on the peripheral side of the exhaust gas discharge port to improve the exhaust gas combustion efficiency.

[0035] As a preferred structural setting, since the burner sensor and the high-voltage ignition package are both devices related to flame, and flame is related to the exhaust gas being effectively burned to avoid the generation of corresponding safety hazards, in order to improve the accuracy of the monitoring between the two, as well as the subsequent feedback, ignition and other related operations, the burner sensor is set adjacent to the high-voltage ignition package.

[0036] The PLC controller includes a signal input terminal and a signal output terminal; wherein the signal input terminal is respectively connected to the exhaust gas sensor and the burner sensor for communication, and the signal output terminal is connected to the high-voltage ignition package for communication.

[0037] In a specific implementation, when the exhaust gas sensor detects exhaust gas discharge and the burner sensor detects the absence of flame, and the signals detected by them are simultaneously written into the signal input end, the PLC controller transmits the ignition signal to the high-voltage ignition package; when the burner sensor detects the presence of flame and rewrites the signal detected by it into the signal input end, the PLC controller transmits the ignition shutdown signal to the high-voltage ignition package.

[0038] Based on this, this embodiment uses the exhaust gas sensor and the burner sensor to monitor the relevant status of the exhaust gas discharge port in real time, and uses the basic feedback control mechanism of the PLC controller to achieve intermittent ignition of the high-voltage ignition package only when there is exhaust gas but no flame. At this time, after the exhaust gas is ignited, the exhaust gas that is already in a burning state will continue to ignite the subsequent overflowing exhaust gas. In this way, in the process of realizing the material conversion by exhaust gas combustion, the use of external fuel is greatly reduced.

[0039] As an abnormality monitoring mechanism to improve the completeness of the ignition device and ensure the reliability of its working process, the ignition device is also provided with an alarm, and the alarm is communicatively connected with the PLC controller. At this time, when an abnormality occurs in the feedback control process of the ignition device, the alarm will give an abnormal alarm, thereby improving the response efficiency and maintenance efficiency of the operation and maintenance personnel. In this embodiment, the alarm can be a signal tower or a buzzer. And different abnormality levels are set for the signal tower or buzzer according to different abnormality levels. At this time, the operation and maintenance personnel can also carry out targeted processing according to the abnormality level to avoid the inability to identify the maintenance priority when the ignition devices of multiple box furnaces are abnormal at the same time, thereby causing greater safety hazards.

[0040] In this embodiment, the model of the PLC controller used is: FX1S-10MR, the model of the exhaust gas sensor is: IFW 15-T, and the model of the burner sensor is: IFW 15-T.

[0041] Based on the model selection of the above-mentioned PLC controller, exhaust gas sensor and burner sensor, the specific electrical connection or electrical communication relationship of the ignition device is as follows: in the exhaust gas sensor, pin 1 is the power input position, and pin 2 is the neutral line position, which are electrically connected to the corresponding circuit of 220V AC respectively. Pin 3 is the exhaust gas signal input position, which is used to obtain the exhaust gas signal of the exhaust gas discharge port. Pins 6 and 7 are exhaust gas signal output positions, which are connected to the X2 pin of the PLC controller.

[0042] In the burner sensor, pin 1 is the power input position, and pin 2 is the neutral line position, which are electrically connected to the corresponding circuit of 220V AC respectively. Pin 3 is the flame signal input position, which is used to obtain the flame signal of the exhaust gas discharge port. Pin 4 is the grounding position, which is the common position with the high-voltage ignition package. Pins 6 and 7 are flame signal output positions, which are connected to the X1 pin of the PLC controller. Pins 8 and 9 are flame monitoring direct control relay 386K6 output to identify the flame state.

[0043] The L pin and the N pin in the PLC controller are electrically connected to the corresponding circuit of 220V AC respectively. The Y0 pin is the ignition control position of the high-voltage ignition package, the Y1 pin is the solenoid valve control position of the liquefied gas, the Y2 pin is the flame monitoring position, and the Y3 pin is the alarm signal output position of the alarm.

[0044] The control mode of the ignition device is divided into manual control mode and automatic control mode. In the manual control process, the solenoid valve of the liquefied gas is opened by the manual switch, and the ignition button is manually pressed to control the high-voltage ignition package to realize the ignition function. In the automatic control process, switches K1, K2, K3 and K4 are closed, the PLC controller power is turned on, and information is exchanged with each component through the corresponding pins, thereby realizing automatic control of the high-voltage ignition package, solenoid valve, burner sensor, etc.

[0045] This embodiment also provides a box-type furnace, which includes the ignition device. In the specific implementation, after the material consumption statistics are generated, it is found that: when the external fuel is liquefied gas, for a box-type furnace using a traditional ignition device, in a full year, when the number of products processed by a box-type furnace is 9.54 million, the corresponding cost of liquefied gas consumed is 390,000 yuan. For a box-type furnace using the ignition device described in this embodiment, in a full year, when the number of products processed by a box-type furnace is 9.38 million, the corresponding cost of liquefied gas consumed is 150,000 yuan. It can be seen that the box-type furnace improved based on the ignition device described in this embodiment can save about 70% of liquefied gas each year, that is, it greatly saves the consumption of external fuels such as liquefied gas.

[0046] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A box-type furnace exhaust gas ignition device, characterized in that: Including exhaust gas sensor, burner sensor, high voltage ignition package and PLC controller that cooperate with each other; The exhaust gas sensor, the burner sensor and the high-voltage ignition package are all arranged around the exhaust gas discharge port; wherein the exhaust gas sensor is used to monitor whether there is exhaust gas discharged from the exhaust gas discharge port, and the burner sensor is used to monitor whether there is a flame at the exhaust gas discharge port; The PLC controller includes a signal input terminal and a signal output terminal; wherein the signal input terminal is respectively connected to the exhaust gas sensor and the burner sensor for communication, and the signal output terminal is connected to the high-voltage ignition package for communication; Among them, the model of the PLC controller is: FX1S-10MR, the model of the exhaust gas sensor is: IFW 15-T, and the model of the burner sensor is: IFW 15-T; in the exhaust gas sensor, pin 3 is the exhaust gas signal input position, which is used to obtain the exhaust gas signal of the exhaust gas discharge port; pins 6 and 7 are exhaust gas signal output positions, which are communicatively connected with the X2 pin of the PLC controller; in the burner sensor, pin 3 is the flame signal input position, which is used to obtain the flame signal of the exhaust gas discharge port; pins 6 and 7 are flame signal output positions, which are communicatively connected with the X1 pin of the PLC controller.

2. The box-type furnace exhaust gas ignition device according to claim 1, characterized in that: The burner inductor is arranged adjacent to the high-voltage ignition package.

3. The box-type furnace exhaust gas ignition device according to claim 1, characterized in that: The Y0 pin of the PLC controller is the ignition control position of the high-voltage ignition package, the Y1 pin is the solenoid valve control position of the liquefied gas, and the Y2 pin is the flame monitoring position.

4. The box-type furnace exhaust gas ignition device according to claim 1, characterized in that: Pin 1 of the exhaust gas sensor is the power input pin, and pin 2 is the neutral line pin.

5. The box-type furnace exhaust gas ignition device according to claim 1, characterized in that: Pin 1 of the burner sensor is the power input pin, pin 2 is the neutral line pin, and pin 4 is the ground pin.

6. The box-type furnace exhaust gas ignition device according to claim 1, characterized in that: It includes an alarm; the alarm is communicatively connected with the PLC controller.

7. A box-type furnace, characterized in that: Comprising the ignition device according to any one of claims 1-6.

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