CN111998669A - Roller kiln safety in production protection system - Google Patents
Roller kiln safety in production protection system Download PDFInfo
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- CN111998669A CN111998669A CN202010877479.2A CN202010877479A CN111998669A CN 111998669 A CN111998669 A CN 111998669A CN 202010877479 A CN202010877479 A CN 202010877479A CN 111998669 A CN111998669 A CN 111998669A
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- 239000002912 waste gas Substances 0.000 claims abstract description 56
- 238000005485 electric heating Methods 0.000 claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 230000032683 aging Effects 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 98
- 238000001514 detection method Methods 0.000 claims description 78
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
- F27B9/045—Furnaces with controlled atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
- F27B9/062—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a roller kiln safety production protection system, which comprises the following subsystems: the electric heating protection subsystem is used for detecting and transmitting the temperature of the thermocouple and the current and the voltage of the heating element so as to drive the central controller to judge the aging degree of the heating element and output an alarm after receiving an alarm instruction; the water supply operation protection subsystem is used for detecting and transmitting the instantaneous water supply flow and the water supply pressure value and outputting an alarm after receiving the alarm instruction; the waste gas treatment furnace protection subsystem is used for controlling the temperature control actuator through the waste gas temperature controller, detecting and transmitting the temperature of the waste gas thermocouple to drive the central controller to carry out comparison processing, and outputting an alarm after receiving an alarm instruction; and the furnace pressure control protection subsystem is used for controlling the variable frequency fan through the furnace pressure temperature controller, detecting and transmitting the temperature detected by the furnace pressure thermocouple, driving the central controller to compare, and outputting an alarm after receiving an alarm instruction. The invention can improve the safety and stability of roller kiln equipment.
Description
Technical Field
The invention relates to a production equipment protection technology, in particular to a roller kiln safety production protection system.
Background
Roller kilns are thermal devices that use electricity or natural gas to calcine, calcine or dry granular and powdery materials. The requirement of the market on the safe use of the roller kiln is higher and higher, but a set of safe production protection system is lacked at present, so that the safety and the stability of equipment in the using process can be improved, the rejection rate of the fired materials is reduced, the safety of operation, maintenance and use personnel is protected, and clean production is realized.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a roller kiln safety production protection system, which can improve the safety and stability of roller kiln equipment, reduce the rejection rate of fired materials and realize clean production.
In order to solve the technical problem, the invention provides a roller kiln safety production protection system which comprises an electric heating protection subsystem, a water supply operation protection subsystem, a waste gas treatment furnace protection subsystem, a furnace pressure control protection subsystem, a central controller and a touch screen, wherein the central controller is electrically connected with the touch screen; the electric heating protection subsystem is used for controlling the electric heating controllable silicon through the electric heating temperature controller, detecting and transmitting the temperature of the electric heating thermocouple and the current and the voltage of the heating element to the central controller, driving the central controller to calculate the running resistance value of the heating element according to the temperature of the electric heating thermocouple and the current and the voltage of the heating element, judging the aging degree of the heating element through the running resistance value, and outputting an alarm after receiving an alarm instruction of the central controller; the water supply operation protection subsystem is used for detecting and transmitting the instantaneous water supply flow and the water supply pressure value to the central controller so as to drive the central controller to compare the transmitted instantaneous water supply flow and the water supply pressure value with a preset water supply alarm value and output an alarm after receiving an alarm instruction of the central controller; the waste gas treatment furnace protection subsystem is used for controlling an output signal of the temperature control actuator through the waste gas temperature controller, detecting and transmitting the temperature of the waste gas thermocouple to the central controller so as to drive the central controller to compare the temperature of the waste gas thermocouple with a preset waste gas alarm value, and outputting an alarm after an alarm instruction of the central controller; the furnace pressure control protection subsystem is used for controlling the output frequency of the variable frequency fan through the furnace pressure temperature controller, detecting and transmitting the temperature detected by the furnace pressure thermocouple to the central controller so as to drive the central controller to compare the temperature detected by the furnace pressure thermocouple with a preset furnace pressure temperature alarm value, and outputting an alarm after receiving an alarm instruction of the central controller.
As an improvement of the scheme, the electric heating protection subsystem comprises an electric heating temperature controller, an electric heating controllable silicon, an electric heating thermocouple and an electric heating acousto-optic alarm, wherein the electric heating temperature controller is respectively and electrically connected with the electric heating controllable silicon and the electric heating thermocouple, the electric heating controllable silicon is respectively and electrically connected with the heating element and the central controller, and the central controller is electrically connected with the electric heating acousto-optic alarm.
As an improvement of the scheme, the water supply operation protection subsystem comprises a water supply temperature controller, a water supply thermocouple, a water supply flowmeter, a water supply pressure gauge and a water supply acousto-optic alarm, wherein the central controller is electrically connected with the water supply temperature controller, the water supply flowmeter, the water supply pressure gauge and the water supply acousto-optic alarm respectively, and the water supply temperature controller is electrically connected with the water supply thermocouple.
As an improvement of the scheme, the waste gas treatment furnace protection subsystem comprises a waste gas sound-light alarm, a waste gas temperature controller, a waste gas thermocouple, a temperature control actuator, a gas electromagnetic valve, an overpressure pressure switch, a low-pressure switch, a combustion-supporting pressure switch, an ignition controller, a burner, a combustion-supporting fan and a gas main valve, wherein the waste gas sound-light alarm, the waste gas temperature controller, the gas electromagnetic valve, the ignition controller, the combustion-supporting fan, the gas main valve, the overpressure pressure switch, the low-pressure switch and the combustion-supporting pressure switch are respectively and electrically connected with a central controller, the waste gas thermocouple, the temperature control actuator and the waste gas temperature controller are sequentially and electrically.
As an improvement of the scheme, the furnace pressure control protection subsystem comprises a frequency conversion fan pressure switch, a frequency conversion fan, a furnace pressure temperature controller, a furnace pressure thermocouple and a furnace pressure acousto-optic alarm, wherein the frequency conversion fan pressure switch, the frequency conversion fan and the furnace pressure thermocouple are respectively and electrically connected with the furnace pressure temperature controller, the furnace pressure temperature controller is electrically connected with a central controller, and the central controller is electrically connected with the furnace pressure acousto-optic alarm.
As an improvement of the scheme, the system further comprises a power-off protection subsystem, wherein the power-off protection subsystem is used for providing a backup power supply when the power supply is controlled to be powered off; the power-off protection subsystem comprises a UPS (uninterrupted power supply), and the UPS is electrically connected with the control power supply and the central controller respectively.
As an improvement of the above scheme, the system further comprises a hazardous gas detection and protection subsystem, wherein the hazardous gas detection and protection subsystem is used for detecting the concentration of the hazardous gas so as to drive the central controller to compare the concentration of the hazardous gas with a preset hazardous gas alarm value, and cutting off the hazardous gas electromagnetic valve and outputting an alarm after receiving an alarm instruction of the central controller; the hazardous gas detection protection subsystem comprises a hazardous gas detection probe, a hazardous gas electromagnetic valve and a hazardous gas acousto-optic alarm, and the central controller is electrically connected with the hazardous gas detection probe, the hazardous gas electromagnetic valve and the hazardous gas acousto-optic alarm respectively.
As an improvement of the scheme, the device also comprises a roller operation protection subsystem, wherein the roller operation protection subsystem comprises a broken rod detection protection module, a motor detection protection module and a broken rod acousto-optic alarm; the broken rod detection protection module is used for detecting the rotation state of the roller rod through the detection device, transmitting a detection signal of the detection device to the central controller and outputting an alarm after receiving an instruction of the central controller; the broken rod detection protection module comprises a clamping spring piece and a detection device, the clamping spring piece is installed at the driven end of the roller rod, the detection device is installed on a supporting mechanism on one side of the driven end of the roller rod, and the clamping spring piece is contacted with the detection device once along with the rotation of the roller rod every circle so as to be electrically connected; the motor detection and protection module is used for detecting the rotation state of the motor through the proximity sensor and transmitting a detection signal to the central controller; the motor detection and protection module comprises a proximity sensor which is arranged at the side of the rotating part of the roller driving motor so as to detect the running state of the rotating part; the detection device, the proximity sensor and the broken rod acousto-optic alarm are respectively and electrically connected with the central controller.
As an improvement of the scheme, the system further comprises a replacement room alarm protection subsystem, wherein the replacement room alarm protection subsystem is used for detecting a position signal of the sagger, transmitting the position signal of the sagger to the central controller, and driving the replacement room door to ascend or descend and outputting an alarm after receiving an instruction of the central controller; the replacement chamber alarm protection subsystem comprises a replacement chamber acousto-optic alarm, a correlation switch and a pneumatic replacement chamber door, wherein the correlation switch is installed below the pneumatic replacement chamber door, and the correlation switch, the replacement chamber acousto-optic alarm and the pneumatic replacement chamber door are respectively and electrically connected with the central controller.
The system comprises a central controller, a gas mode instruction of the central controller, a gas inlet and outlet replacement door, a gas outlet and inlet and outlet replacement door, a gas outlet and inlet replacement door, a gas inlet and outlet replacement door, a gas inlet and; the furnace atmosphere protection alarm subsystem comprises an oxygen content analyzer, a pneumatic inlet/outlet replacement door and a replacement lifting door acousto-optic alarm, wherein the oxygen content analyzer, the pneumatic inlet/outlet replacement door and the replacement lifting door acousto-optic alarm are respectively and electrically connected with the central controller.
The beneficial effects of the implementation of the invention are as follows:
the roller kiln safety production protection system can improve the safety and stability of roller kiln equipment, reduce the rejection rate of fired materials and realize clean production. The following effects are achieved particularly for each subsystem:
the electric heating protection subsystem is used for detecting and transmitting the temperature of the electric heating thermocouple and the current and the voltage of the heating element to the central controller, so that the central controller is driven to calculate the running resistance value of the heating element according to the temperature of the electric heating thermocouple and the current and the voltage of the heating element, the ageing degree of the heating element is judged according to the running resistance value, and an alarm is output after an alarm instruction of the central controller is received, so that the safety and the stability of the heating element are effectively monitored.
The water supply operation protection subsystem is used for detecting and transmitting the instantaneous water supply flow and the water supply pressure value to the central controller so as to drive the central controller to compare the instantaneous water supply flow and the water supply pressure value with a preset water supply alarm value and output an alarm after receiving an alarm instruction of the central controller, thereby ensuring the safety and the stability of water supply.
The waste gas treatment furnace protection subsystem is used for controlling the output signal of the temperature control actuator through the waste gas temperature controller so as to control the stability of the temperature in the incineration treatment furnace, the temperature of the waste gas thermocouple is detected and transmitted to the central controller so as to drive the central controller to compare the temperature of the waste gas thermocouple with a preset waste gas alarm value, an alarm is output after an alarm instruction of the central controller, and the safe operation of the incineration treatment furnace is further ensured.
The furnace pressure control protection subsystem is used for controlling the output frequency of the variable frequency fan through the furnace pressure temperature controller, detecting and transmitting the temperature detected by the furnace pressure thermocouple to the central controller, and driving the central controller to output an alarm according to the temperature detected by the furnace pressure thermocouple, so that the furnace pressure is stabilized, and the temperature of waste gas is not too high.
Drawings
FIG. 1 is a schematic diagram of the general structure of the roller kiln safety production protection system of the invention;
FIG. 2 is a schematic structural view of an electric heating protection subsystem of the roller kiln safety production protection system of the invention;
FIG. 3 is a schematic structural diagram of a water supply operation protection subsystem of the roller kiln safety production protection system of the invention;
FIG. 4 is a schematic structural diagram of a protection subsystem of the waste gas treatment furnace of the roller kiln safety production protection system of the invention;
FIG. 5 is a schematic view of the installation position of the waste gas treatment furnace protection subsystem of the roller kiln safety production protection system of the invention;
FIG. 6 is a schematic structural diagram of a furnace pressure control protection subsystem of the roller kiln safety production protection system of the invention;
FIG. 7 is a schematic diagram of the UPS power supply of the roller kiln safety production protection system according to the present invention;
FIG. 8 is a schematic structural diagram of a hazardous gas detection protection subsystem of the roller kiln safety production protection system of the invention;
FIG. 9 is a schematic structural diagram of a roller operation protection subsystem of the roller kiln safety production protection system of the present invention;
FIG. 10 is a schematic structural diagram of a replacement room alarm protection subsystem of the roller kiln safety production protection system of the present invention;
FIG. 11 is a schematic structural diagram of an in-furnace atmosphere protection alarm subsystem of the roller kiln safety production protection system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the invention is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the invention.
Fig. 1 is a schematic diagram of an overall structure of an embodiment 100 of the roller kiln safety production protection system of the present invention. The roller kiln safety production protection system comprises an electric heating protection subsystem 1, a water supply operation protection subsystem 2, a waste gas treatment furnace protection subsystem 3, a furnace pressure control protection subsystem 4, a central controller 5 and a touch screen 6, wherein the central controller 5 is electrically connected with the touch screen 6.
FIG. 2 is a schematic structural diagram of an electric heating protection subsystem of the roller kiln safety production protection system. The electric heating protection subsystem is used for controlling the electric heating controllable silicon through the electric heating temperature controller, detecting and transmitting the temperature of the electric heating thermocouple and the current and the voltage of the heating element to the central controller, driving the central controller to calculate the running resistance value of the heating element according to the temperature of the electric heating thermocouple and the current and the voltage of the heating element, judging the aging degree of the heating element through the running resistance value, and outputting an alarm after receiving an alarm instruction of the central controller.
Specifically, the electrical heating protection subsystem 1 comprises an electrical heating temperature controller 11, an electrical heating controllable silicon 12, an electrical heating thermocouple 13 and an electrical heating acousto-optic alarm 14, wherein the electrical heating temperature controller 11 is electrically connected with the electrical heating controllable silicon 12 and the electrical heating thermocouple 13 respectively, the electrical heating controllable silicon 12 is electrically connected with a heating element 15 and a central controller 5 respectively, and the central controller 5 is electrically connected with the electrical heating acousto-optic alarm 14.
For an electric heating system, after the roller kiln is produced for a period of time, the resistance is increased or broken due to the aging of a heating element, so that the heating efficiency is lowered, and the firing temperature cannot reach the set temperature, thereby influencing the production. Heating element breakage may also connect to the furnace wall, resulting in electrical leakage. In addition, if the electric heating thermocouple is damaged and corroded and cannot be replaced in time, the temperature zone cannot be heated and controlled, and the possibility of scrapping of fired materials is caused.
Aiming at the situation, the electric heating temperature controller controls the output signal of the electric heating controllable silicon in a PID mode by detecting the temperature of the electric heating thermocouple. The electric heating silicon controlled rectifier detects the current and the voltage of the heating element and uploads the detection data to the central controller. The central controller can calculate the running resistance value of the heating element, judge the aging degree of the heating element through the running resistance value and the output signal of the silicon controlled rectifier, and output an alarm notice through the electric heating acousto-optic alarm, thereby effectively monitoring the safety and the stability of the heating element and reducing the possibility of scrapping of the fired materials.
A Silicon Controlled Rectifier (SCR) is a high-power electrical component, also called a thyristor. It has the advantages of small volume, high efficiency, long service life, etc. In an automatic control system, the device can be used as a high-power driving device to realize the control of high-power equipment by using a low-power control. It is widely applied to speed regulating systems, power regulating systems and follow-up systems of alternating current and direct current motors.
In addition, the central controller is connected to the electrically heated thyristor point via a contactor 16. The contactor is a device capable of quickly cutting off alternating current and direct current main loops and frequently switching on and off a large-current control circuit, can be used for controlling electric loads such as motors, factory equipment, electric heaters, working machines and various power units, and not only can switch on and off the circuit, but also has a low-voltage release protection effect.
Further, the electrical heating protection subsystem further comprises an electrical leakage detection device 17, and the electrical leakage detection device 17 is electrically connected with the central controller 5.
The electric leakage detection device takes the current of the electric heating thermocouple and the output percentage of the temperature control module as an electric leakage evaluation index. For example, when the percentage value of the corresponding output of the heating element is small, the current of the heating element is extremely large, and the electric leakage detection device of the main loop detects large electric leakage current, the central controller can judge that the electric leakage condition of the heating loop occurs, so that the loop is automatically cut off for heating, and an electric heating sound-light alarm outputs an alarm.
FIG. 3 is a schematic structural diagram of a water supply operation protection subsystem of the roller kiln safety production protection system. The water supply operation protection subsystem is used for detecting and transmitting the water supply instantaneous flow and the water supply pressure value to the central controller so as to drive the central controller to compare the transmitted water supply instantaneous flow and the water supply pressure value with a preset water supply alarm value and output an alarm after receiving an alarm instruction of the central controller.
Specifically, the water supply operation protection subsystem 2 comprises a water supply temperature controller 21, a water supply thermocouple 22, a water supply flowmeter 23, a water supply pressure gauge 24 and a water supply acousto-optic alarm 25, the central controller 5 is electrically connected with the water supply temperature controller 21, the water supply flowmeter 23, the water supply pressure gauge 24 and the water supply acousto-optic alarm 25 respectively, and the water supply temperature controller 21 is electrically connected with the water supply thermocouple 22.
In the normal production process of the roller kiln, when the water supply pressure or the water supply flow of the cooling circulating water is insufficient, the discharging temperature of the burnt material is too high, the danger of scalding personnel is caused, and the influence on the lower-section equipment is possibly caused.
Aiming at the situation, the central controller can read the instantaneous flow of the water supply flowmeter of the water inlet pipeline and the pressure value of the water supply pressure gauge, compare the instantaneous flow with the preset water supply alarm value, and output an alarm through the water supply acousto-optic alarm if the instantaneous flow is not within the preset water supply alarm value setting range.
Specifically, the water supply thermocouple comprises a water inlet thermocouple and a water return thermocouple, the water inlet thermocouple is installed and inserted into the water inlet pipe, and the water return thermocouple is installed and inserted into the water return pipe.
The central controller ensures that the water inlet temperature is in an allowable range by monitoring the temperature values of the water supply thermocouples arranged outside the water inlet pipe and the water return pipe so as to ensure the normal operation of cooling circulating water, and the system outputs alarm through the water supply sound-light alarm when the water temperature exceeds a preset water supply temperature warning value or when the flow and the water pressure are insufficient, so that the safety and the stability of water supply are ensured.
FIG. 4 is a schematic structural diagram of a protection subsystem of the waste gas treatment furnace of the roller kiln safety production protection system. The waste gas treatment furnace protection subsystem is used for controlling an output signal of the temperature control actuator through the waste gas temperature controller, detecting and transmitting the temperature of the waste gas thermocouple to the central controller so as to drive the central controller to compare the temperature of the waste gas thermocouple with a preset waste gas alarm value, and outputting an alarm after an alarm instruction of the central controller.
Specifically, the exhaust gas treatment furnace protection subsystem 3 includes an exhaust gas acousto-optic alarm 31, an exhaust gas temperature controller 32, an exhaust gas thermocouple 33, a temperature control actuator 34, a gas electromagnetic valve 35, an overpressure pressure switch 36, a low pressure switch 37, a combustion-supporting pressure switch 38, an ignition controller 39, a burner 310, a combustion-supporting fan 311 and a gas main valve 312, the exhaust gas acousto-optic alarm 31, the exhaust gas temperature controller 32, the gas electromagnetic valve 35, the ignition controller 39, the combustion-supporting fan 311, the gas main valve 312, the overpressure pressure switch 36, the low pressure switch 37 and the combustion-supporting pressure switch 38 are respectively electrically connected with the central controller 5, the exhaust gas thermocouple 33, the temperature control actuator 34 and the exhaust gas temperature controller 32 are sequentially electrically connected, and the gas electromagnetic valve 35.
In the normal production process of the roller kiln, waste gas generated in the kiln contains toxic combustible components and needs to be treated by an incineration treatment furnace. In the burning process, the problem of the overtemperature of the burning furnace may occur, for example, the burning furnace is damaged when the overtemperature exceeds the highest temperature resistance of the heat insulation material in the burning furnace, and the problem of under-temperature or flameout may also occur, for example, the temperature does not reach the temperature of waste gas treatment, so that waste gas cannot be treated. In addition, the normal supply of fuel gas and combustion-supporting air is also required to be ensured so as to ensure the normal operation of the incineration treatment furnace.
In view of the above situation, the exhaust gas temperature controller detects the temperature of the exhaust gas thermocouple and controls the output signal of the temperature control actuator through the PID mode, thereby controlling the stability of the temperature in the incineration furnace. Meanwhile, when the temperature is over-temperature or under-temperature and the gas is over-pressure or under-pressure, corresponding alarms can be sent out. In addition, when the central controller does not ignite after executing the automatic ignition, the burner does not ignite any more and gives an alarm to ensure the safe operation of the incineration treatment furnace. And finally, the central controller controls the gas electromagnetic valve to be switched on only in the ignition or ignition state of the burner, so that the safety is ensured.
FIG. 5 is a schematic view of the installation position of the waste gas treatment furnace protection subsystem of the roller kiln safety production protection system of the invention. A low-pressure switch 37 is installed at an inlet of a gas pipeline of the gas station 313, when the pressure of a gas source is too low, an alarm message that 'primary gas pressure is too low' is triggered, the pressure of the gas source is reduced through a pressure reducer 314 and an overpressure pressure switch 36 is installed at the pipeline behind a gas main valve 312, and when the reduced gas pressure is too high, an alarm message that 'secondary gas pressure is too high' is triggered. The combustion-supporting air of the incineration furnace is supplied by a combustion-supporting fan 311, a combustion-supporting pressure switch 38 is arranged on a combustion-supporting air pipeline, and when the air pressure is too low, an alarm signal that the combustion-supporting air pressure is too low is triggered, so that field personnel are informed to check in time, the normal supply of fuel gas and the combustion-supporting air is maintained, and the normal operation of the incineration furnace is ensured.
FIG. 6 is a schematic structural diagram of a furnace pressure control protection subsystem of the roller kiln safety production protection system of the present invention. And the furnace pressure control protection subsystem is used for controlling the output frequency of the variable frequency fan through the furnace pressure temperature controller, detecting and transmitting the temperature detected by the furnace pressure thermocouple to the central controller, and driving the central controller to adjust the opening of the cold air port pumping brake according to the temperature detected by the furnace pressure thermocouple.
Specifically, the furnace pressure control protection subsystem 4 includes a frequency conversion fan pressure switch 41, a frequency conversion fan 42, a furnace pressure temperature controller 43, a furnace pressure thermocouple 44 and a furnace pressure acousto-optic alarm 45, wherein the frequency conversion fan pressure switch 41, the frequency conversion fan 42 and the furnace pressure thermocouple 44 are respectively electrically connected with the furnace pressure temperature controller 43, the furnace pressure temperature controller 43 is electrically connected with the central controller 5, and the central controller 5 is electrically connected with the furnace pressure acousto-optic alarm 45.
During the normal production process of the roller kiln, a large amount of waste gas is generated during material sintering, so that the pressure in the kiln is increased. When equipment such as an exhaust fan fails and cannot operate, waste gas in the kiln cannot be discharged. The kiln has too high pressure, and the waste gas may enter into the heating equipment and the transmission equipment, thereby causing damage or pollution to the internal parts. In addition, if the temperature of the waste gas is too high, the damage of the variable frequency fan can be caused.
Aiming at the above situation, the furnace pressure temperature controller controls the output frequency of the variable frequency fan according to the pressure value detected by the pressure switch of the variable frequency fan, thereby stabilizing the furnace pressure. The central controller compares the temperature detected by the furnace pressure thermocouple with a preset furnace pressure temperature alarm value, and if the temperature detected by the furnace pressure thermocouple exceeds the preset furnace pressure temperature alarm value, an alarm is given out through a furnace pressure sound-light alarm. In addition, furnace pressure control protection subsystem 4 still includes cold wind mouth and takes out floodgate, and it is installed on the cold wind mouth of frequency conversion fan place pipeline, and after the maintenance personal obtained the police dispatch newspaper, the aperture size that can manual regulation cold wind mouth took out the floodgate for waste gas temperature can not be too high.
The central Controller may be a Programmable Logic Controller (PLC), which includes a large number of logic control circuits and can perform logic operations on various detection signals. Preferably, the central controller may employ a PLC of a type including, but not limited to, Siemens S7-1200/1500.
Preferably, the furnace pressure temperature controller may adopt a model including, but not limited to, a model NX-D15/25/35 regulator module, and the model may further obtain a furnace pressure input value in addition to a temperature signal of the thermocouple, compare the furnace pressure input value with a set furnace pressure value, and then output a control signal to control the frequency of the frequency converter fan through an internal PID control mode.
Other structures of the roller kiln safety production protection system of the invention are further explained below.
FIG. 7 is an electrical connection diagram of a UPS of the roller kiln safety production protection system of the invention. The roller kiln safety production protection system also comprises a power-off protection subsystem, wherein the power-off protection subsystem is used for providing a backup power supply when the power supply is controlled to be powered off.
Specifically, the power-off protection subsystem comprises a UPS (uninterrupted power supply) 7, and the UPS is electrically connected with the control power supply and the central controller respectively.
The UPS power supply is used for starting to serve as a backup power supply when the control power supply is powered off.
An Uninterruptible Power Supply (UPS) is an Uninterruptible Power Supply (UPS) that includes an energy storage device. The UPS power supply functions as a voltage regulator during normal power supply while charging the internal battery. When the control power supply is powered off, the UPS immediately supplies the electric energy in the internal battery to the control power supply for use.
In addition, the central controller switches the operation mode of the relevant device to the power-off safe operation mode under the condition, and specifically includes: 1. the transmission roller rod can circularly operate in the actions of positive rotation, stopping, reverse rotation and stopping, so that the materials are guaranteed to stay in the furnace and the roller rod rotates, the roller rod is prevented from stopping for a long time, a sagger filled with the materials above the roller rod is enabled to return to press the roller rod for a long time, and finally the roller rod is enabled to be bent and deformed or even broken. 2. The heating circuit will be switched off and no further heating will be performed. 3. The incineration furnace and the variable frequency fan continue to operate to ensure that residual waste gas can be effectively treated and discharged. 4. The protective gas such as nitrogen is continuously injected into the furnace to protect the materials and the saggar in the furnace.
FIG. 8 is a schematic structural diagram of a hazardous gas detection protection subsystem of the roller kiln safety production protection system of the invention. The roller kiln safety production protection system also comprises a hazardous gas detection protection subsystem. The hazardous gas detection protection subsystem is used for detecting the concentration of the hazardous gas, so as to drive the central controller to compare the concentration of the hazardous gas with a preset hazardous gas alarm value, and cut off the hazardous gas electromagnetic valve and output an alarm after receiving an alarm instruction of the central controller.
Specifically, the hazardous gas detection protection subsystem comprises a hazardous gas detection probe 81, a hazardous gas solenoid valve 82 and a hazardous gas acousto-optic alarm 83, and the central controller 5 is electrically connected with the hazardous gas detection probe 81, the hazardous gas solenoid valve 82 and the hazardous gas acousto-optic alarm 83 respectively.
During the normal production process of the roller kiln, one or more dangerous gases, such as acetylene, can be injected due to process requirements, or combustible gases, such as liquefied petroleum gas and liquefied natural gas, need to be injected due to an incineration treatment furnace. When these dangerous gases leak, they may cause injury to personnel.
In order to solve the problems, a dangerous gas detection probe is installed in a gas station area, and when the dangerous gas detection probe detects that dangerous gas leaks and reaches a certain concentration, the central controller can automatically cut off a dangerous gas electromagnetic valve and send out an alarm through a dangerous gas sound-light alarm. In addition, no matter the roller kiln is normally used, overhauled or under other conditions, as long as equipment such as the dangerous gas detection probe, the dangerous gas electromagnetic valve, the dangerous gas acousto-optic alarm and the like are in operation all the time under the power-on condition, and the safety is ensured.
FIG. 9 is a schematic structural diagram of a roller operation protection subsystem of the roller kiln safety production protection system of the present invention. The roller kiln safety production protection system also comprises a roller operation protection subsystem, wherein the roller operation protection subsystem comprises a broken rod detection protection module, a motor detection protection module and a broken rod acousto-optic alarm.
The broken rod detection protection module is used for detecting the rotation state of the roller rod through the detection device, transmitting a detection signal of the detection device to the central controller and outputting an alarm after receiving an instruction of the central controller.
Specifically, the broken rod detection protection module comprises a clamping spring piece 911 and a detection device 912, wherein the clamping spring piece 911 is installed at the driven end of the roller rod, the detection device 912 is installed on a supporting mechanism on one side of the driven end of the roller rod, and the clamping spring piece 911 is contacted with the detection device 912 once along with the rotation of the roller rod every circle so as to be electrically connected.
The motor detection protection module is used for detecting the rotation state of the motor through the proximity sensor and transmitting a detection signal to the central controller.
Specifically, the motor detection protection module includes a proximity sensor 921 installed at a side of a rotation part of the roll bar driving motor to detect an operation state of the rotation part; the detection device 912, the proximity sensor 921 and the rod breakage audible and visual alarm 93 are electrically connected to the central controller 5.
In the normal production process of the roller kiln, the transmission roller rod needs to be ensured to rotate at a set rotating speed. If the roller rod is in a stop state, the saggar presses the roller rod for a long time, and the roller rod can be bent, deformed and even broken. If the roller bar does not rotate at the set rotating speed, the retention and firing time of the materials in the inner container is possibly insufficient, and the materials are scrapped. In addition, if two adjacent roller rods are broken, saggars can fall off, and the condition of kiln blockage is caused.
Aiming at the situation, a clamp spring piece is arranged at the driven end of each roller rod, and a detection device is arranged above each roller rod or on a supporting mechanism at one side of the driven end of each roller rod. When the roller rod rotates, the clamping reed contacts the detection device, so that the detection device is conducted to generate an electric signal, and when the clamping reed is separated from the detection device, the detection device is disconnected and does not generate the electric signal. The electric signal is transmitted to the central controller, the central controller can judge whether the roller rod rotates and breaks through the method, and if the roller rod breaks, the roller rod breaks through the rod breaking acousto-optic alarm 93 to give an alarm.
The roller driving device is a frequency converter driving motor, and specifically, the frequency converter driving motor is connected with a driven shaft in a chain wheel and chain manner, and the driven shaft is provided with an oblique gear to drive the roller. When the variable frequency driving motor rotates, the rotating part of the variable frequency driving motor is close to the proximity sensor, the proximity sensor outputs signals to the central controller, and when the rotating part of the variable frequency driving motor is far away from the proximity sensor, the rotating part does not output signals. The central controller can judge whether the frequency converter driving motor is in a rotating state or not through the mode, and if the frequency converter driving motor is not in the rotating state, alarm information is output on the touch screen.
In addition, the central controller can also judge whether the frequency converter driving motor normally rotates according to the running state of the rotating part of the frequency converter driving motor detected by the proximity sensor, for example, the output of the proximity sensor is counted. For example, the number of the markers such as gears on the rotating part is set to be a, the central controller calculates the time required for the rotating part to rotate for one circle after acquiring the output signals of the a proximity sensors, and then the theoretical rotating speed of each roller rod is calculated. The central controller compares whether the error between the calculated actual rotating speed of the roller and the theoretical rotating speed of the roller is within a preset allowable error range, and if not, the central controller outputs alarm information on the touch screen. In addition, if the frequency converter driving motor fails, the frequency converter can also output an alarm signal.
Furthermore, the detection device comprises two fixed connecting pieces and an input/output module, wherein the fixed connecting pieces are electrically connected with the input/output module, and the input/output module is electrically connected with the central controller.
When the clamping spring piece rotates along with the roller rod and is in contact with the two fixed contact pieces, the two fixed contact pieces are conducted to generate an electric signal, and when the clamping spring piece is not in contact with the two fixed contact pieces, the two fixed contact pieces are disconnected to generate no electric signal. Specifically, the card spring sheet and the two fixed connection sheets can be made of metal sheets, and the input/output module can be a 40-channel digital input module with the model number of Waring brand SRND-CM
Specifically, the rotating part is a sprocket on a sprocket of the roller driving motor.
The rotating speed of the sprocket is in direct proportion to the driving motor of the frequency converter, and the sprocket can be used as a detection object of the proximity sensor without adding other markers. Of course, other markers can be arranged on the frequency converter driving motor and the transmission mechanism thereof as required to be used as detection objects of the proximity sensor, for example, iron sheets can be arranged on chain wheel teeth of a chain wheel of the roller rod driving motor, so that the identification degree of the detection objects is higher, and the detection of the proximity sensor is facilitated.
Fig. 10 is a schematic structural diagram of a replacement room alarm protection subsystem of the roller kiln safety production protection system. The roller kiln safety production protection system also comprises a replacement room alarm protection subsystem.
And the replacement room alarm protection subsystem is used for detecting a position signal of the saggar, transmitting the position signal of the saggar to the central controller, driving the replacement room door to ascend or descend and outputting an alarm after receiving an instruction of the central controller.
Specifically, the replacement chamber alarm protection subsystem comprises a replacement chamber acousto-optic alarm 101, a correlation switch 102 and a pneumatic replacement chamber door 103, wherein the correlation switch 102 is installed below the pneumatic replacement chamber door 103, and the correlation switch 102, the replacement chamber acousto-optic alarm 101 and the pneumatic replacement chamber door 103 are respectively and electrically connected with the central controller 5.
Roller kilns are in normal business turn over saggar in-process, when the saggar is irregular, and just in time in pneumatic replacement room door below, if pneumatic replacement room door descends this moment, can lead to the saggar to be crushed the condition.
Aiming at the situation, a correlation switch is arranged below a pneumatic replacement chamber door, and in an automatic operation state, when the correlation switch below the pneumatic replacement chamber door detects that a sagger exists, a central controller controls the replacement chamber door not to be allowed to descend and outputs an alarm through a sound-light alarm of the replacement chamber. When the pneumatic replacement chamber door descends, and the correlation switch simultaneously detects a saggar, the central controller immediately cuts off a descending signal of the pneumatic replacement chamber door and outputs an ascending signal, the pneumatic replacement chamber door is controlled to ascend, and alarm information is output through the sound-light alarm of the replacement chamber.
FIG. 11 is a schematic structural diagram of an in-furnace atmosphere protection alarm subsystem of the roller kiln safety production protection system of the present invention. The roller kiln safety production protection system also comprises a furnace atmosphere protection alarm subsystem.
The furnace atmosphere protection alarm subsystem is used for detecting the oxygen content in the furnace and transmitting the oxygen content in the furnace to the central controller, keeping the pneumatic inlet and outlet replacement door to be in an ascending state after receiving an air mode instruction of the central controller so as to ensure air circulation, or keeping one pneumatic inlet and outlet replacement door to be closed after receiving an atmosphere mode instruction of the central controller so as to perform protective gas replacement when materials enter the replacement chamber, or outputting an alarm after receiving an alarm instruction of the central controller.
Specifically, the furnace atmosphere protection alarm subsystem includes an oxygen content analyzer 111, a pneumatic entrance/exit replacement door 112 and a replacement lift door acousto-optic alarm 113, wherein the oxygen content analyzer 111, the pneumatic entrance/exit replacement door 112 and the replacement lift door acousto-optic alarm 113 are respectively electrically connected with the central controller 5.
In the normal production process of the roller kiln, the firing quality of the materials can be ensured only by ensuring that the oxygen content in the furnace atmosphere meets the process requirements, and the loss caused by scrapping of the fired materials due to the fact that the oxygen content does not meet the standard can be caused.
For the above case, the central controller has two modes, an air mode and an atmosphere mode. In the air mode: the pneumatic inlet and outlet replacement door keeps an ascending state and cannot descend, so that air circulation is ensured. This mode is typically determined by the use or material firing process when the kiln is dried or air fired. Under the atmosphere mode, when the access & exit replacement room was in business turn over the saggar, kept a pneumatic import & export replacement door closed state throughout, in the material gets into the replacement room, can carry out the protective gas replacement, will replace indoor air and discharge through the mode of beating into protective gas, guarantee inside air can not get into the kiln. The central controller reads the oxygen content of the furnace atmosphere detected by the oxygen content analyzer, and outputs oxygen content alarm information when the oxygen content in the furnace does not reach the standard, and the sound-light alarm 113 of the replacement lifting door outputs the oxygen content alarm information.
Finally, it should be noted that unnecessary equipment loss and personnel injury caused by misoperation of other people may occur in the maintenance process of the roller kiln. In view of the above situation, the management system of the central controller can set user permissions, and distinguish permissions of different users, such as permissions of "operation", "maintenance", "process", "management", and the like. When a user with the authority of 'overhaul' logs in a management system of a central controller through a touch screen, the system can be set to be in a maintenance state, an operation interface of the touch screen is in a locked state in the state, users with other authorities can only monitor, only the user with the authority of 'overhaul' can operate, and words of 'the equipment is overhauled and non-maintenance personnel forbid operation' are displayed on the operation interface of the touch screen to prompt personnel.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A roller kiln safety production protection system is characterized by comprising an electric heating protection subsystem, a water supply operation protection subsystem, a waste gas treatment furnace protection subsystem, a furnace pressure control protection subsystem, a central controller and a touch screen, wherein the central controller is electrically connected with the touch screen;
the electric heating protection subsystem is used for controlling the electric heating controllable silicon through the electric heating temperature controller, detecting and transmitting the temperature of the electric heating thermocouple and the current and the voltage of the heating element to the central controller, driving the central controller to calculate the running resistance value of the heating element according to the temperature of the electric heating thermocouple and the current and the voltage of the heating element, judging the aging degree of the heating element through the running resistance value, and outputting an alarm after receiving an alarm instruction of the central controller;
the water supply operation protection subsystem is used for detecting and transmitting the instantaneous water supply flow and the water supply pressure value to the central controller so as to drive the central controller to compare the transmitted instantaneous water supply flow and the water supply pressure value with a preset water supply alarm value and output an alarm after receiving an alarm instruction of the central controller;
the waste gas treatment furnace protection subsystem is used for controlling an output signal of the temperature control actuator through the waste gas temperature controller, detecting and transmitting the temperature of the waste gas thermocouple to the central controller so as to drive the central controller to compare the temperature of the waste gas thermocouple with a preset waste gas alarm value, and outputting an alarm after an alarm instruction of the central controller;
the furnace pressure control protection subsystem is used for controlling the output frequency of the variable frequency fan through the furnace pressure temperature controller, detecting and transmitting the temperature detected by the furnace pressure thermocouple to the central controller so as to drive the central controller to compare the temperature detected by the furnace pressure thermocouple with a preset furnace pressure temperature alarm value, and outputting an alarm after receiving an alarm instruction of the central controller.
2. The roller kiln safety production protection system according to claim 1, wherein the electric heating protection subsystem comprises an electric heating temperature controller, an electric heating controllable silicon, an electric heating thermocouple and an electric heating acousto-optic alarm, the electric heating temperature controller is electrically connected with the electric heating controllable silicon and the electric heating thermocouple respectively, the electric heating controllable silicon is electrically connected with a heating element and the central controller respectively, and the central controller is electrically connected with the electric heating acousto-optic alarm.
3. The roller kiln safety production protection system according to claim 1, wherein the water supply operation protection subsystem comprises a water supply temperature controller, a water supply thermocouple, a water supply flowmeter, a water supply pressure gauge and a water supply acousto-optic alarm, the central controller is electrically connected with the water supply temperature controller, the water supply flowmeter, the water supply pressure gauge and the water supply acousto-optic alarm respectively, and the water supply temperature controller is electrically connected with the water supply thermocouple.
4. The roller kiln safety production protection system according to claim 1, wherein the waste gas treatment furnace protection subsystem comprises a waste gas sound-light alarm, a waste gas temperature controller, a waste gas thermocouple, a temperature control actuator, a gas electromagnetic valve, an overpressure pressure switch, a low pressure switch, a combustion-supporting pressure switch, an ignition controller, a burner, a combustion-supporting fan and a gas main valve, wherein the waste gas sound-light alarm, the waste gas temperature controller, the gas electromagnetic valve, the ignition controller, the combustion-supporting fan, the gas main valve, the overpressure pressure switch, the low pressure switch and the combustion-supporting pressure switch are respectively electrically connected with the central controller, the waste gas thermocouple, the temperature control actuator and the waste gas temperature controller are sequentially and electrically connected, and the gas electromagnetic valve is electrically connected with the burner.
5. The roller kiln safety production protection system according to claim 1, wherein the furnace pressure control protection subsystem comprises a variable frequency fan pressure switch, a variable frequency fan, a furnace pressure temperature controller, a furnace pressure thermocouple and a furnace pressure acousto-optic alarm, the variable frequency fan pressure switch, the variable frequency fan and the furnace pressure thermocouple are respectively electrically connected with the furnace pressure temperature controller, the furnace pressure temperature controller is electrically connected with the central controller, and the central controller is electrically connected with the furnace pressure acousto-optic alarm.
6. The roller kiln safety production protection system of claim 1, further comprising a power-off protection subsystem for providing backup power when the control power is off;
the power-off protection subsystem comprises a UPS (uninterrupted power supply), and the UPS is electrically connected with the control power supply and the central controller respectively.
7. The roller kiln safety production protection system according to claim 1, further comprising a hazardous gas detection protection subsystem, wherein the hazardous gas detection protection subsystem is used for detecting the concentration of the hazardous gas, so as to drive the central controller to compare the concentration of the hazardous gas with a preset hazardous gas alarm value, and after receiving an alarm instruction from the central controller, the hazardous gas electromagnetic valve is switched off and an alarm is output;
the hazardous gas detection protection subsystem comprises a hazardous gas detection probe, a hazardous gas electromagnetic valve and a hazardous gas acousto-optic alarm, and the central controller is electrically connected with the hazardous gas detection probe, the hazardous gas electromagnetic valve and the hazardous gas acousto-optic alarm respectively.
8. The roller kiln safety production protection system of claim 1, further comprising a roller operation protection subsystem, wherein the roller operation protection subsystem comprises a broken rod detection protection module, a motor detection protection module and a broken rod acousto-optic alarm;
the broken rod detection protection module is used for detecting the rotation state of the roller rod through a detection device, transmitting a detection signal of the detection device to the central controller and outputting an alarm after receiving an instruction of the central controller;
the broken rod detection protection module comprises a clamp spring piece and a detection device, the clamp spring piece is installed at the driven end of the roller rod, the detection device is installed on a supporting mechanism on one side of the driven end of the roller rod, and the clamp spring piece is contacted with the detection device once along with the rotation of the roller rod every circle so as to be electrically connected;
the motor detection and protection module is used for detecting the rotation state of the motor through the proximity sensor and transmitting a detection signal to the central controller;
the motor detection and protection module comprises a proximity sensor which is arranged beside a rotating part of the roller driving motor so as to detect the running state of the rotating part;
the detection device, the proximity sensor and the broken rod acousto-optic alarm are respectively and electrically connected with the central controller.
9. The roller kiln safety production protection system as claimed in claim 1, further comprising a replacement room alarm protection subsystem, wherein the replacement room alarm protection subsystem is used for detecting a sagger position signal, transmitting the sagger position signal to the central controller, and driving the replacement room door to ascend or descend and outputting an alarm after receiving an instruction from the central controller;
the displacement chamber alarm protection subsystem comprises a displacement chamber acousto-optic alarm, a correlation switch and a pneumatic displacement chamber door, wherein the correlation switch is installed below the pneumatic displacement chamber door, and the correlation switch, the displacement chamber acousto-optic alarm and the pneumatic displacement chamber door are respectively and electrically connected with the central controller.
10. The system for protecting the safe production of a roller kiln according to claim 1, further comprising a furnace atmosphere protection alarm subsystem for detecting the oxygen content in the furnace and transmitting the oxygen content in the furnace to the central controller, wherein the pneumatic inlet/outlet replacement door is kept in an ascending state to ensure air circulation when receiving an air mode command from the central controller, or one pneumatic inlet/outlet replacement door is kept closed to perform protective gas replacement when the material enters the replacement chamber after receiving the atmosphere mode command from the central controller, or an alarm is output after receiving an alarm command from the central controller;
the furnace atmosphere protection alarm subsystem comprises an oxygen content analyzer, a pneumatic inlet and outlet replacement door and a replacement lifting door acousto-optic alarm, wherein the oxygen content analyzer, the pneumatic inlet and outlet replacement door and the replacement lifting door acousto-optic alarm are electrically connected with the central controller respectively.
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Cited By (1)
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| CN116294578A (en) * | 2023-05-22 | 2023-06-23 | 天津巴莫科技有限责任公司 | Roller kiln and gas control device thereof |
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|---|---|---|---|---|
| CN116294578A (en) * | 2023-05-22 | 2023-06-23 | 天津巴莫科技有限责任公司 | Roller kiln and gas control device thereof |
| CN116294578B (en) * | 2023-05-22 | 2023-08-08 | 天津巴莫科技有限责任公司 | Roller kiln and gas control device thereof |
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