CN112180822A - Mining heating system based on graphene carbon fiber electrothermal film - Google Patents

Mining heating system based on graphene carbon fiber electrothermal film Download PDF

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Publication number
CN112180822A
CN112180822A CN202011020245.2A CN202011020245A CN112180822A CN 112180822 A CN112180822 A CN 112180822A CN 202011020245 A CN202011020245 A CN 202011020245A CN 112180822 A CN112180822 A CN 112180822A
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electrothermal film
circuit
temperature
plc
protecting device
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CN202011020245.2A
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Inventor
冯驰
刘振雄
云磊
刘岳
尉志武
胡瀚超
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Datong Coal Mine Group Co Ltd
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Datong Coal Mine Group Co Ltd
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Priority to CN202011020245.2A priority Critical patent/CN112180822A/en
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/056—Programming the PLC
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/13—Plc programming
    • G05B2219/13004—Programming the plc

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Temperature (AREA)

Abstract

The invention discloses a mine heating system based on a graphene carbon fiber electrothermal film, and relates to the field of mine temperature control. The system comprises an electric control system, a monitoring system and an electrothermal film fixing and protecting device; the electric control system is a dual temperature control system and comprises a power supply circuit, a load circuit, a dual control circuit, a PLC control circuit and a K-type temperature controller circuit; the monitoring system comprises configuration monitoring and video monitoring, a temperature sensor and a video monitoring camera are used for respectively acquiring temperature values and video information, and alarm conditions are set for control; the electrothermal film fixing and protecting device comprises an electrothermal film fixing and protecting device fixed on the gate and an electrothermal film fixing and protecting device fixed on the residual load, and both the electrothermal film fixing and protecting device and the electrothermal film fixing and protecting device comprise an electrothermal film and an aluminum silicate heat-insulating cotton layer, so that heat is only conducted to a place needing to be heated. The invention effectively solves the problem of environmental pollution, saves a large amount of consumption of manpower, material resources and financial resources, and ensures the safety of heating or warming.

Description

Mining heating system based on graphene carbon fiber electrothermal film
Technical Field
The invention relates to the field of mining temperature control, in particular to a mining heating system based on a graphene carbon fiber electrothermal film.
Background
On the ground of some coal mines, a coal storage bin with large storage capacity is generally built for loading of trains, and a coal leaking nozzle and a gate are arranged at the lower part of the coal storage bin. In winter, effective anti-freezing measures are required to be taken, so that the coal leaking nozzle and the gate are prevented from being frozen, and the train is guaranteed to be normally dispatched on time. In the past, coal-fired boilers have been used in mines to provide hot air to the bottom of coal silos for freeze protection purposes, for example, a 4000 ton silo would be fired with 2 tons of coal each year. However, the method has high energy consumption and large pollution, belongs to equipment which is eliminated by the environmental protection policy in the future, and needs to be eliminated and dismantled. Therefore, in order to solve the problem of gate freeze prevention, an electric heating system with low cost, low energy consumption, safety and reliability needs to be developed additionally to thoroughly solve the problem of gate freeze prevention.
Disclosure of Invention
The invention provides a mining heating system based on a graphene carbon fiber electrothermal film, aiming at solving the problems of low cost, low energy consumption, safety and reliability in gate freezing prevention.
The invention is realized by the following technical scheme: a mining heating system based on a graphene carbon fiber electrothermal film comprises an electric control system, a monitoring system and an electrothermal film fixing and protecting device;
the electric control system is a dual temperature control system and comprises a power supply circuit, a load circuit, a dual control circuit, a PLC control circuit and a K-type temperature controller circuit; setting the number of loads as n, wherein the number of the loads is respectively a load I and a load II … … load n;
a power supply circuit: the normally-closed contact of the total contactor KM is connected with a coil of the total contactor KM and a button switch SB2 in series to form a series circuit I, the normally-closed contact of the total contactor KM is connected with a lamp L1 in series to form a series circuit II, and the series circuit I is connected with the series circuit II in parallel and then connected to a single-phase power supply through a corresponding fuse FU;
a load circuit: the load I and the load II … … are respectively corresponding to a contactor KM1 and a contactor KM2 … … KMnThe normally open contact and the leakage protection circuit breakers QF1 and QF2 … … QFn are connected in series and then are respectively connected into one phase of a three-phase power supply, the number of loads connected into the A phase, the B phase and the C phase is n/3, and an integer is rounded off to ensure that all the loads are connected;
the PLC control circuit: the PLC comprises a PLC, wherein a plurality of input ports of the PLC are connected with contactors KM with corresponding quantity, output ports of the PLC are connected with coils of intermediate relays J with corresponding quantity, the quantity of the contactors KM and the quantity of the intermediate relays J are 1 more than that of loads, and the contactors KM are divided by contactors KM1 and KM2 … … KM corresponding to the loadsnIn addition, a contactor KM is also arrangedn+1The intermediate relay J is J1 and J2 … … J respectivelyn、Jn+1(ii) a The intermediate relay Jn+1Single-control contactor KMn+1The PLC control circuit is connected with a single-phase power supply through a transformer T, a corresponding fuse FU and a leakage protection breaker QF, and the PLC is also connected with a temperature transmitter VII;
k type temperature controller circuit: the temperature control system comprises a plurality of K-type temperature controllers, wherein the number of the K-type temperature controllers is equal to that of loads, and the K-type temperature controllers are K1 and K2 … … K respectivelyn(ii) a All power supplies of the K-type temperature controller pass through the contactor KMn+1The normally closed contact, the corresponding fuse FU and the leakage protection circuit breaker QF are connected with a single-phase power supply;
dual control circuit: all normally open contacts of the K-type temperature controller are connected with the contactor KMn+1The normally open contacts are connected in parallel, and the circuits after being connected in parallel are respectively corresponding to contactors KM1 and KM2 … … KMnThe coils of (a) are respectively connected in series, and the formed series circuits are respectively connected with corresponding intermediate relays J1 and J2 … … JnThe normally closed contacts are connected in series to form a double control circuit, and the double control circuit is connected with a single-phase power supply through a corresponding fuse FU and a leakage protection circuit breaker QF;
the monitoring system comprises a plurality of temperature sensors and a plurality of video monitoring cameras, the temperature sensors are arranged on each heating unit, the video monitoring cameras are distributed at the positions of all loads, the temperature sensors are connected with an RS485 photoelectric converter I and connected with an RS485 photoelectric converter II through a communication optical cable, the RS485 photoelectric converter II is connected with an RS 485-to-RS 232 passive converter, and the RS 485-to-RS 232 passive converter is connected with a configuration monitoring computer;
the video monitoring camera is connected with an Ethernet switch I, the Ethernet switch I is connected with an Ethernet photoelectric converter II through a communication optical cable after being connected with the Ethernet photoelectric converter I, and the Ethernet photoelectric converter II is connected with a video monitoring computer after being connected with the Ethernet switch II; the Ethernet switch I is also connected with a PLC controller; the PLC controller is connected to a configuration monitoring computer through an Ethernet switch I, an Ethernet photoelectric converter I, a communication optical cable, an Ethernet photoelectric converter II and an Ethernet switch II;
thirdly, fixing and protecting the electric heating film: the electrothermal film fixing and protecting device comprises an electrothermal film fixing and protecting device fixed on the gate and an electrothermal film fixing and protecting device fixed on the residual load:
the electric heating film fixing and protecting device is fixed on the gate and comprises a protective shell and a heating unit, wherein the heating unit is positioned in the protective shell, the shape of the protective shell is matched with that of the gate iron plate, the left edge, the right edge and the lower edge of the protective shell are welded on the gate iron plate, a filled gap is reserved between the protective shell and the gate iron plate, the upper edge of the protective shell is opened and provided with a protective shell cover, the protective shell cover is installed on the gate iron plate through a sealing rubber sheet and a bolt, and a horn mouth installation hole is formed in an iron sheet at the left edge of the protective shell; the heating unit comprises an aluminum silicate heat-insulating cotton layer, a universal glue layer, a galvanized iron sheet, an electric heating film and a temperature sensor, the electric heating film, the aluminum silicate heat-insulating cotton layer and the galvanized iron sheet are sequentially arranged from the gate iron plate to the outside, adjacent components are bonded into a whole through the universal glue layer, and the electric heating film and the temperature sensor are tightly attached to the gate iron plate; the electric wire of the electric heating film penetrates out of the aluminum silicate heat-insulating cotton layer and extends out of the horn mouth mounting hole to be connected with a circuit, and a water guide angle iron is tightly fixed on the lower side of the electric heating film fixing protection device; the electrothermal film fixing and protecting device fixed on the residual load comprises an electrothermal film and an aluminum silicate heat-insulating cotton layer, wherein the electrothermal film is attached to a heating body, the aluminum silicate heat-insulating cotton layer covers the outer side of the electrothermal film, and the inner side of the electrothermal film is also provided with a temperature sensor; the aluminum silicate heat-insulating cotton layer is also wrapped with aluminum foil.
The invention discloses a mining heating system based on a graphene carbon fiber electrothermal film, which aims to realize the anti-freezing of an upper gate of a coal mine. The invention firstly selects the graphene carbon fiber electrothermal film as a heat source with the power of 200 plus 400W/m2The electric heat conversion rate is as high as 98%, and the electric heating device has the characteristics of uniform heating, high heating efficiency, low energy consumption, acid resistance, alkali resistance, aging resistance, long service life, certain waterproofness and the like, so the electric heating device is an optimal gate or industrial equipment electric heating body, in order to avoid coal heating spontaneous combustion or insufficient heat gate freezing, a dual temperature control system is developed, and dual temperature control protection functions are realized, wherein firstly, the temperature control is realized by executing a programming command through a PLC (programmable logic controller), secondly, the temperature control is realized through a K-type temperature controller, and two sets of temperature control modes form a primary mode and a standby mode to ensure that the temperature control is effective at all times, and the schematic diagram is shown in figure 1. On the basis of the system and the device, the fact that video and temperature monitoring needs to be carried out on each gate is found, so that a temperature monitoring system is further arranged, the temperature sensors and the PLC are configured through configuration software of a monitoring computer, data of each sensor transmitted by the temperature sensors can be displayed, real-time monitoring on each heating unit is achieved, and alarm prompts such as low temperature, high temperature and faults are set. When a heating unit of the electric heating system breaks down, an alarm music can be timely sent out, an alarm information window is popped up, maintenance personnel is prompted to deal with the fault, and a schematic diagram is shown inAs shown in fig. 2. The three parts together ensure the safe and reliable operation of the heating system. The working processes are respectively as follows:
the first, electric control system: after the main leakage protection circuit breaker QF is closed, a start button SB1 is pressed, the main contactor KM is closed, the overvoltage and undervoltage protector is automatically closed, all the leakage protection circuit breakers QF are closed, all the power supplies and the control part complete basic power transmission, and the automatic control stage is started. The K-type temperature controller is started, namely K1-Kn, and is switched on or off a K1-Kn normally open contact according to a set temperature value, so that constant-temperature heating control is performed on the KM1-KMn heating group; in order to prevent the relay in the K-type temperature controller from being damaged due to long-time high-frequency use, the invention writes a temperature control program through the PLC to carry out standby control, and if the K-type temperature controller fails, the PLC controls the J-type temperature controllern+1Realization of KMn+1Action, KMn+1The normally open contact closed short circuit K-type temperature controller normally open contact, KMn+1The normally closed contact is opened to completely cut off the K-type temperature controller, and the system enters a PLC single control mode at the moment. For example, the coal bunker is heated by 30 degrees, the temperature set by K1 is 30 degrees, K1 is closed when the temperature of the heating element is below 28 degrees, and K1 is disconnected when the temperature rises to 30 degrees. If the PLC is programmed to 35 degrees, J1 acts to attract, and the J1 normally closed contact is disconnected, the KM1 is disconnected. When the temperature drops below 32 ℃, J1 is released, the J1 contact is closed, and KM1 is closed to start heating. If the K1 can not be disconnected, the J1 operates to disconnect the KM1 power supply when the temperature continuously rises to 35 ℃, the heating is finished, and the heating is started when the temperature drops to 32 ℃, so that the problem of overheating caused by the fact that the K1 can not be disconnected is solved. If K1 can not be closed, when the temperature is reduced to 25 ℃, the remote monitoring computer sends out low temperature alarm, and the monitoring personnel can suck J through remote operationn+1，KMn+1And (3) acting, disconnecting all the K-type temperature controllers, and short-circuiting K1-Kn contacts, wherein the temperature control is completely realized by using a PLC. And a maintenance worker immediately goes to the site to disconnect the QF circuit breaker, replaces the K-type temperature controller, and adopts the temperature transmitter VII to be connected with the temperature sensor to acquire temperature signals.
Secondly, a monitoring system: the monitoring system can monitor the temperature value of each gate through a remote computer room and set alarm prompts of low temperature, high temperature, failure and the like. When a heating unit of the electric heating system breaks down, alarm music can be sent out in time, an alarm information window is popped up, and maintenance personnel are prompted to deal with the fault. The temperature sensors are input into the temperature sensors according to the serial number sequence and the installation position sequence, and the temperature sensors can acquire and store temperature values in sequence. The communication mode of the temperature sensor is an RS485 bus mode, an RS485 photoelectric converter is used for transmitting an RS485 signal to a monitoring room through an optical cable, and the RS 485-to-RS 232 passive converter is used for converting the signal and then connecting the signal to a computer. The monitoring system also adopts a PLC controller with an Ethernet port, and an Ethernet communication signal of the PLC controller is accessed to a configuration monitoring computer through an Ethernet switch I, an Ethernet photoelectric converter I, a communication optical cable, an Ethernet photoelectric converter II and the Ethernet switch II. The configuration monitoring computer uses configuration software to configure the temperature sensors and the PLC, can display data of each sensor transmitted by the temperature sensors, realizes real-time monitoring of each heating unit, and achieves the purpose of automatic and intelligent use of the system. The monitoring system further comprises video monitoring, video monitoring cameras are mounted at key positions of all gates or hydraulic pump stations, when the system breaks down, maintenance personnel can observe the general situation according to the video images, and the monitoring computer is matched with prompt information to perform related operations. Because each surveillance point position is nearer, the camera adopts POE power supply mode, has practiced thrift the use of power cord, and video signal passes through POE switch and photoelectric converter and passes to the control room with the signal.
Thirdly, fixing and protecting the electric heating film: because the self heating value of the electric heating film is small, a certain heat preservation measure must be matched in the installation and use process, and the cold-proof purpose of the equipment can be achieved. When the electric heating film is installed, the electric heating film is required to be attached to the heating body and then covered by the heat preservation cotton, so that heat is only conducted to a place needing to be heated. The heat preservation cotton needs to use high-temperature-resistant aluminum silicate cotton wrapped by aluminum foil, the aluminum foil can reflect far-infrared waves generated by the electrothermal film, and the high-temperature-resistant aluminum silicate cotton can avoid fire spreading caused by the electrothermal film firing (small probability events). The electrothermal film fixing and protecting device comprises an electrothermal film fixing and protecting device fixed on the gate and an electrothermal film fixing and protecting device fixed on the residual load: the electric heating film fixed protection device fixed on the gate is fixed on the outer side of a gate iron plate, the waterproof property, the fireproof property and the external force resisting effect must be considered, the gate iron plate is arc-shaped, the electric heating film protection device comprises a protective shell and a heating unit, the heating unit is positioned inside the protective shell, the heating unit is assembled firstly and then is directly inserted into the protective shell through an opening at the upper edge of the protective shell, the shape of the protective shell is matched with that of the gate iron plate, the left edge, the right edge and the lower edge of the protective shell are both welded on the gate iron plate, a filled gap is reserved between the protective shell and the gate iron plate, the upper edge of the protective shell is opened and provided with a protective shell cover, the protective shell is arranged on the gate iron plate through a sealing rubber sheet and a bolt, a cover is opened on the protective shell, the electric heating film and, Protecting the cover from any damage and deformation; a horn mouth mounting hole is also formed in the iron sheet at the left edge of the protective shell; the heating unit comprises a temperature sensor, an electric heating film, an aluminum silicate heat-insulating cotton layer and a galvanized iron sheet in sequence from the gate iron plate to the outside, adjacent components are bonded into a whole through a universal glue layer respectively, and the electric heating film and the temperature sensor are ensured to be tightly attached to the gate iron plate; the electric heating film is used for heating a gate iron plate, the temperature sensor is used for collecting the temperature, the aluminum silicate heat-insulation cotton layer is adhered to the electric heating film, so that the heat is only conducted to a gate needing to be heated, the aluminum foil can reflect far infrared waves generated by the electric heating film, the aluminum silicate heat-insulation cotton layer is also wrapped with the aluminum foil, the high-temperature resistant aluminum silicate cotton can avoid fire spread caused by the ignition of the electric heating film, the galvanized iron sheet is adhered to the outer side of the aluminum silicate heat-insulation cotton layer through the universal adhesive layer, the temperature sensor is further arranged on the inner side of the electric heating film, and the galvanized iron sheet and; the electric wire of the electric heating film penetrates out of the aluminum silicate heat-insulating cotton layer and extends out of the horn mouth mounting hole to be connected with a circuit, and a water guide angle iron is tightly fixed on the lower side of the electric heating film fixing and protecting device and can guide water flowing down in the coal bunker away without corroding the protective shell; the electrothermal film fixed protection device fixed on the residual load adopts a universal mode because the heating body is not fixed, so that the electrothermal film is attached on the heating body, and the aluminum silicate heat-insulating cotton layer can be fixed in any mode to cover the outer side of the electrothermal film, thereby ensuring the direction of heat conduction.
Compared with the prior art, the invention has the following beneficial effects: compared with the heating of the original coal-fired boiler, the mine heating system based on the graphene carbon fiber electrothermal film provided by the invention uses the 4000 ton coal storage bin as an example when the original coal-fired boiler is used for heating, and the annual cost is calculated as follows: the average boiler consumes 3 tons of high-quality lump coal and 60 kilograms of desulfurized flake caustic soda per day, and the total value is 2400 yuan/day; the total power of devices such as a boiler induced draft fan, an air blower and the like is 55KW, electricity per degree is calculated according to 0.7 yuan, and electricity charge is 924 yuan consumed in 24 hours; heating for 150 days all year round, wherein the heating time for 24 hours is about 90 days, and the heating time for 12 hours is about 60 days; the maintenance cost of the boiler is 3 ten thousand yuan per year on average; the cost of the firemen is 5 ten thousand yuan per year; in summary, annual consumption:
Figure 13618DEST_PATH_IMAGE002
total consumption of 47.9 ten thousand yuan; after the graphene carbon fiber electric heating film mining heating system is replaced, the electric heating system consumes 2 ten thousand yuan each year, and the detail is as follows: the construction cost is about 7 ten thousand approximately, the total power of the system is 9KW, the system is stopped when the temperature is controlled and adjusted, the system works for 18 hours each day on average, and the electricity consumption of the system is 1.7 ten thousand in the heating period of 5 months each year when each degree of electricity is calculated according to 0.7 yuan; the number of parts to be repaired and replaced is less than 3000 yuan each year; the system monitoring and maintenance personnel do not need to set special posts, the work is arranged in the daily work arrangement of the electromechanical maintenance team of the coal station, and the additional expenditure of labor cost is not needed, so that the total consumption is 17000+3000=20000 yuan; compared with the original coal-fired boiler, the invention saves the consumption of manpower, material resources and financial resources, and saves about 46 ten thousand yuan of capital every year. Therefore, the mining heating system based on the graphene carbon fiber electrothermal film provided by the invention has the advantages that the carbon fiber electrothermal film is stable in operation, high in safety and good in effect, and meanwhile, the system is energy-saving and environment-friendly, and creates greater social benefits for environmental protection and social development; the graphene carbon fiber electrothermal film is directly attached to a coal storage bin gate or other heating bodies, the exterior of the graphene carbon fiber electrothermal film is covered by a heat insulation material, the heat loss is almost zero, and the good heating and anti-freezing purposes are realized. The inventionThe mine heating system effectively solves the problem of environmental pollution, not only saves a large amount of funds, but also ensures heating safety, so that the heating system has wide application field and has great popularization and application prospect.
Drawings
FIG. 1 is an electrical schematic of the electrical control system of the present invention.
Fig. 2 is a schematic structural diagram of the monitoring system of the present invention.
Fig. 3 is a front view of the fixing and protecting device of the electric heating film fixed on the gate of the present invention.
Fig. 4 is a side view of the fixing and protecting device of the electric heating film fixed on the gate of the present invention.
Fig. 5 is a schematic filling diagram of the protection shell of the fixing and protecting device for the electrothermal film fixed on the gate according to the present invention.
The figures are labeled as follows: 1-aluminum silicate heat preservation cotton layer, 2-all-purpose adhesive layer, 3-white iron sheet, 4-protective shell, 5-electric heating film, 6-temperature sensor, 7-horn mouth mounting hole, 8-water guide angle iron, 9-gate iron plate, 10-sealing rubber, 11-bolt, 401-protective shell cover, 101-video monitoring camera, 102-temperature sensor, 103-RS 485 photoelectric converter I, 104-Ethernet photoelectric converter I, 105-Ethernet switch I, 106-PLC controller, 107-communication optical cable, 108-RS 485-to-RS 232 passive converter, 109-RS 485 photoelectric converter II, 110-Ethernet photoelectric converter II, 111-Ethernet switch II, 112-video monitoring computer and 113-configuration monitoring computer.
Detailed Description
The present invention is further illustrated by the following specific examples.
A mining heating system based on graphite alkene carbon fiber electric heat membrane: as shown in fig. 1 to 5, the device comprises an electric control system, a monitoring system and an electric heating film fixing and protecting device;
the electric control system is a dual temperature control system and comprises a power supply circuit, a load circuit, a dual control circuit, a PLC control circuit and a K-type temperature controller circuit; setting the number of loads as n, wherein the number of the loads is respectively a load I and a load II … … load n;
a power supply circuit: the normally-closed contact of the total contactor KM is connected with a coil of the total contactor KM and a button switch SB2 in series to form a series circuit I, the normally-closed contact of the total contactor KM is connected with a lamp L1 in series to form a series circuit II, and the series circuit I is connected with the series circuit II in parallel and then connected to a single-phase power supply through a corresponding fuse FU;
a load circuit: the load I and the load II … … are respectively corresponding to a contactor KM1 and a contactor KM2 … … KMnThe normally open contact and the leakage protection circuit breakers QF1 and QF2 … … QFn are connected in series and then are respectively connected into one phase of a three-phase power supply, the number of loads connected into the A phase, the B phase and the C phase is n/3, and an integer is rounded off to ensure that all the loads are connected;
the PLC control circuit: the PLC comprises a PLC, wherein a plurality of input ports of the PLC are connected with contactors KM with corresponding quantity, output ports of the PLC are connected with coils of intermediate relays J with corresponding quantity, the quantity of the contactors KM and the quantity of the intermediate relays J are 1 more than that of loads, and the contactors KM are divided by contactors KM1 and KM2 … … KM corresponding to the loadsnIn addition, a contactor KM is also arrangedn+1The intermediate relay J is J1 and J2 … … J respectivelyn、Jn+1(ii) a The intermediate relay Jn+1Single-control contactor KMn+1The PLC control circuit is connected with a single-phase power supply through a transformer T, a corresponding fuse FU and a leakage protection breaker QF, and the PLC is also connected with a temperature transmitter VII;
k type temperature controller circuit: the temperature control system comprises a plurality of K-type temperature controllers, wherein the number of the K-type temperature controllers is equal to that of loads, and the K-type temperature controllers are K1 and K2 … … K respectivelyn(ii) a All power supplies of the K-type temperature controller pass through the contactor KMn+1The normally closed contact, the corresponding fuse FU and the leakage protection circuit breaker QF are connected with a single-phase power supply;
dual control circuit: all normally open contacts of the K-type temperature controller are connected with the contactor KMn+1The normally open contacts are connected in parallel, and the circuits after being connected in parallel are respectively corresponding to contactors KM1 and KM2 … … KMnThe coils of (a) are respectively connected in series, and the formed series circuits are respectively connected with corresponding intermediate relays J1 and J2 … … JnThe normally closed contacts are connected in series to form a double control circuit, and the double control circuit is connected with a single-phase power supply through a corresponding fuse FU and a leakage protection circuit breaker QF;
the monitoring system comprises a plurality of temperature sensors 102 and a plurality of video monitoring cameras 101, the temperature sensors 102 are installed on each heating unit, the video monitoring cameras 101 are distributed at positions of each load, the temperature sensors 102 are connected with an RS485 photoelectric converter I103 and connected with an RS485 photoelectric converter II 109 through a communication optical cable 107, the RS485 photoelectric converter II 109 is connected with an RS 485-to-RS 232 passive converter 108, and the RS 485-to-RS 232 passive converter 108 is connected with a configuration monitoring computer 113;
the video monitoring camera 101 is connected with an Ethernet switch I105, the Ethernet switch I105 is connected with an Ethernet photoelectric converter I104 and then connected with an Ethernet photoelectric converter II 110 through a communication optical cable 107, and the Ethernet photoelectric converter II 110 is connected with an Ethernet switch II 111 and then connected with a video monitoring computer 112; the Ethernet switch I105 is also connected with a PLC 106; the PLC controller 106 is connected to a configuration monitoring computer 113 through an Ethernet switch I105, an Ethernet photoelectric converter I104, a communication optical cable 107, an Ethernet photoelectric converter II 110 and an Ethernet switch II 111;
thirdly, fixing and protecting the electric heating film: the electrothermal film fixing and protecting device comprises an electrothermal film fixing and protecting device fixed on the gate and an electrothermal film fixing and protecting device fixed on the residual load:
the electric heating film fixing and protecting device is fixed to the outer side of a gate iron plate 9, the gate iron plate 9 is arc-shaped, the electric heating film fixing and protecting device comprises a protective shell 4 and a heating unit, the heating unit is located inside the protective shell 4, the shape of the protective shell 4 is matched with that of the gate iron plate 9, the left edge, the right edge and the lower edge of the protective shell 4 are both welded to the gate iron plate 9, a gap for filling is reserved between the protective shell 4 and the gate iron plate 9, the upper edge of the protective shell 4 is opened and provided with a protective shell cover 401, the protective shell cover 401 is installed on the gate iron plate 9 through a sealing rubber sheet 10 and a bolt 11, and a horn mouth installation hole 7 is further formed in the; the heating unit comprises an aluminum silicate heat-insulating cotton layer 1, a universal glue layer 2, a tinplate 3, an electrothermal film 5 and a temperature sensor 6, the electrothermal film 5, the aluminum silicate heat-insulating cotton layer 1 and the tinplate 3 are sequentially arranged from the gate iron plate 4 to the outside, adjacent components are bonded into a whole through the universal glue layer 2, and the electrothermal film 5 and the temperature sensor 6 are tightly attached to the gate iron plate 4; the electric wire of the electric heating film 5 penetrates out of the aluminum silicate heat-preservation cotton layer 1 and extends out of the horn mouth mounting hole 7 to be connected with a circuit, and a water guide angle iron 8 is tightly fixed on the lower side of the electric heating film fixing and protecting device; the electrothermal film fixing and protecting device fixed on the residual load comprises an electrothermal film 5 and an aluminum silicate heat-insulating cotton layer 1, wherein the electrothermal film 5 is attached to a heating body, the aluminum silicate heat-insulating cotton layer 1 covers the outer side of the electrothermal film, and a temperature sensor 6 is also arranged on the inner side of the electrothermal film 5; the aluminum silicate heat-insulating cotton layer 1 is also wrapped with aluminum foil.
In this embodiment, the number n of the loads is 6, so that the number of the contactors KM is 7, the number of the intermediate relays J is 7, the temperature sensor 6 is a DS18B20 temperature sensor, and a bus of the temperature sensor 6 is a shielded wire with a wire diameter greater than 0.75 mm; furthermore, in the present embodiment, a shielded 4-core twisted pair is adopted, wherein one pair of wires is respectively connected to a ground line and a signal line, the other pair of wires is connected to Vcc and a ground line, and the shielding layer is grounded at a single point at the source end; the protective housing 4 adopts 5mm iron plate, 5 cm's clearance is formed with gate iron plate 9 to protective housing 4.
In this embodiment, as shown in fig. 1, in the load circuit: the load I and the load II … … correspond to a KM1, a KM2 … … KM6, a QF1 and a QF2 … … QF6 respectively, the number of loads respectively connected to the phase A, the phase B and the phase C is 2, namely, every two loads are respectively connected to the phase A, the phase B and the phase C; in the dual control circuit: the fuse is FU2, and the leakage protection breaker QF is QF 7; there are 7 contactors KM, besides those connected to the load, KM 7; in the PLC control circuit, a fuse is FU3, a leakage protection breaker QF is QF8, and intermediate relays J are J1, J2 … … J6 and J7 respectively; j7 single-control KM 7; in the K-type temperature controller circuit: the fuse is FU4, the leakage protection breaker QF is QF9, and all coils of the K-type temperature controller are connected with a single-phase power supply through a contactor KM7, the fuse FU4 and the leakage protection breaker QF 9.
The operation of this embodiment is as follows:
the first, electric control system: after the main leakage protection circuit breaker QF is closed, a start button SB1 is pressed, the main contactor KM is closed, the overvoltage and undervoltage protector is automatically closed, all the leakage protection circuit breakers QF are closed, all the power supplies and the control part complete basic power transmission, and the automatic control stage is started. The K-type temperature controller is started, namely K1-K6, and is switched on and off from a K1-K6 normally open contact according to a set temperature value, so that the KM1-KM6 heating group is subjected to constant-temperature heating control; in order to prevent that the long-time high-frequency use of relay in the K type temperature controller from causing the damage, this embodiment still compiles the control by temperature change procedure through PLC simultaneously and carries out standby control, if the K type temperature controller breaks down, PLC realizes the action of KM7 through control J7, KM 7's normally open contact closed short circuit K type temperature controller normally open contact, KM 7's normally closed contact is opened with the whole outage of K type temperature controller, this moment this system gets into PLC single control mode, temperature transmitter VII gathers the temperature value this moment, play the auxiliary action, can observe whether K type temperature controller breaks down. If the coal storage bin is heated at 30 ℃, the temperature set by K1-K6 is 30 ℃, the K1-K6 attract the coal when the temperature is below 28 ℃, and the K1-K6 disconnect when the temperature rises to 30 ℃. If the PLC program is programmed to 35 degrees, J1-J6 act to attract, and the J1-J6 normally closed contacts are disconnected, and KM1-KM6 are disconnected. When the temperature is reduced to below 32 ℃, J1-J6 are released, J1-J6 contacts are closed, and KM1-KM6 are closed to start heating. If K1 (or other temperature controllers) can not be disconnected, the J1 acts to disconnect the KM1 power supply (or the intermediate relays corresponding to the other temperature controllers act to disconnect the contactor power supply) when the temperature continuously rises to 35 ℃, heating is finished, and heating is started when the temperature drops to 32 ℃, so that the problem of overheating caused by the fact that the K-type temperature controller can not be disconnected is solved. If one K-type temperature controller (such as K1) can not be closed, when the temperature is reduced to 25 ℃, the remote monitoring computer sends out low-temperature alarm, monitoring personnel pull in J7 and KM7 through remote operation to open all K-type temperature controllers and short-circuit K1-K6 contacts, and the temperature control is completely realized by using a PLC. And the maintenance personnel immediately go to the site to disconnect the QF9 circuit breaker and replace the K-type temperature controller.
Secondly, a monitoring system: each load is provided with a temperature sensor, the temperature sensor used on the monitoring system is a DS18B20 temperature sensor, a 16-bit serial number is recorded in a ROM when the sensor leaves a factory and can be regarded as an address of the DS18B20, the serial number sequence is input into the temperature sensors according to the installation position sequence, and the temperature sensors can acquire and store temperature values in sequence; and collecting a temperature value, transmitting an RS485 signal to a monitoring room by an RS485 photoelectric converter through an optical cable in an RS485 bus mode, and converting the signal by an RS 485-to-RS 232 passive converter and then accessing the converted signal to a configuration monitoring computer. The monitoring system adopts a Siemens PLC controller, S7-200SMART and is provided with an Ethernet port, an Ethernet communication signal of the PLC controller is connected into a configuration monitoring computer through an Ethernet switch I105, an Ethernet photoelectric converter I104, a communication optical cable 107, an Ethernet photoelectric converter II 110 and an Ethernet switch II 111, the configuration monitoring computer configures a temperature sensor and the PLC by using configuration software, the data of each sensor transmitted by the temperature sensor can be displayed, the real-time monitoring of each heating unit is realized, and low temperature, high temperature, fault and other alarm prompts are set. The video monitoring part is characterized in that a video monitoring camera is arranged at the key position of each load, a Siemens PLC controller and S7-200SMART are adopted for transmitting signals to a monitoring room through an optical cable by an Ethernet photoelectric converter, and the signals are accessed to a computer network port.
Thirdly, fixing and protecting the electric heating film: the fixing and protecting device is fixed on the gate, the gate iron plate 9 is arc-shaped, the shape of the protective shell 4 is matched with that of the gate iron plate 9, the left edge, the right edge and the lower edge of the protective shell 4 are welded on the gate iron plate 9, a filled gap is reserved between the protective shell 4 and the gate iron plate 9, a gap of 5cm is reserved in the embodiment, the electric heating film 5 and the aluminum silicate heat-insulating cotton layer 1 are bonded by using the universal glue layer 2, the temperature sensor 6 is bonded on the inner side of the electric heating film 5, the outer side of the aluminum silicate heat-insulating cotton layer 1 is wrapped with an aluminum foil, then the galvanized iron sheet 3 is bonded on the outer side of the aluminum silicate heat-insulating cotton layer 1 by using the universal glue layer 2, the circuit of the electric heating; then, the formed heating unit is plugged into the protective shell 4 from an opening formed in the upper part of the protective shell 4, after plugging, the protective shell cover 401 covers the upper edge of the protective shell 4 and is installed on the gate iron plate 9 through a sealing rubber 10 and a bolt 11, and the rubber plays a role in water prevention and sealing; the water guide angle iron 8 guides away water flowing down in the coal bunker; and finally, leading out the line to be connected with a circuit, and then controlling the heating of the electrothermal film through an electric control system.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.

Claims (6)

1. The utility model provides a mining heating system based on graphite alkene carbon fiber electric heat membrane which characterized in that: comprises an electric control system, a monitoring system and an electrothermal film fixing and protecting device;
the electric control system is a dual temperature control system and comprises a power supply circuit, a load circuit, a dual control circuit, a PLC control circuit and a K-type temperature controller circuit; setting the number of loads as n, wherein the number of the loads is respectively a load I and a load II … … load n;
a power supply circuit: the normally-closed contact of the total contactor KM is connected with a coil of the total contactor KM and a button switch SB2 in series to form a series circuit I, the normally-closed contact of the total contactor KM is connected with a lamp L1 in series to form a series circuit II, and the series circuit I is connected with the series circuit II in parallel and then connected to a single-phase power supply through a corresponding fuse FU;
a load circuit: the load I and the load II … … are respectively corresponding to a contactor KM1 and a contactor KM2 … … KMnThe normally open contact and the leakage protection circuit breakers QF1 and QF2 … … QFn are connected in series and then are respectively connected into one phase of a three-phase power supply, the number of loads connected into the A phase, the B phase and the C phase is n/3, and an integer is rounded off to ensure that all the loads are connected;
the PLC control circuit: the PLC comprises a PLC, wherein a plurality of input ports of the PLC are connected with contactors KM with corresponding quantity, output ports of the PLC are connected with coils of intermediate relays J with corresponding quantity, the quantity of the contactors KM and the quantity of the intermediate relays J are 1 more than that of loads, and the contactors KM are divided by contactors KM1 and KM2 … … KM corresponding to the loadsnIn addition, a contactor KM is also arrangedn+1The intermediate relay J is J1 and J2 … … J respectivelyn、Jn+1(ii) a The intermediate relay Jn+1Single-control contactor KMn+1The PLC control circuit is connected with a single-phase power supply through a transformer T, a corresponding fuse FU and a leakage protection breaker QF, and the PLC is also connected with a temperature transmitter VII;
k type temperature controller circuit: the temperature control system comprises a plurality of K-type temperature controllers, wherein the number of the K-type temperature controllers is equal to that of loads, and the K-type temperature controllers are K1 and K2 … … K respectivelyn(ii) a All power supplies of the K-type temperature controller pass through the contactor KMn+1The normally closed contact, the corresponding fuse FU and the leakage protection circuit breaker QF are connected with a single-phase power supply;
dual control circuit: all normally open contacts of the K-type temperature controller are connected with the contactor KMn+1The normally open contacts are connected in parallel, and the circuits after being connected in parallel are respectively corresponding to contactors KM1 and KM2 … … KMnThe coils of (a) are respectively connected in series, and the formed series circuits are respectively connected with corresponding intermediate relays J1 and J2 … … JnThe normally closed contacts of (1) are connected in series to form a dual control circuit which is connected with the drain through the corresponding fuse FUThe electric protection circuit breaker QF is connected with a single-phase power supply;
the monitoring system comprises a plurality of temperature sensors (102) and a plurality of video monitoring cameras (101), the temperature sensors (102) are installed on each heating unit, the video monitoring cameras (101) are distributed at positions where loads are located, the temperature sensors (102) are connected with an RS485 photoelectric converter I (103) and connected with an RS485 photoelectric converter II (109) through a communication optical cable (107), the RS485 photoelectric converter II (109) is connected with an RS 485-to-RS 232 passive converter (108), and the RS 485-to-RS 232 passive converter (108) is connected with a configuration monitoring computer (113);
the video monitoring camera (101) is connected with an Ethernet switch I (105), the Ethernet switch I (105) is connected with an Ethernet photoelectric converter I (104) and then connected with an Ethernet photoelectric converter II (110) through a communication optical cable (107), and the Ethernet photoelectric converter II (110) is connected with an Ethernet switch II (111) and then connected with a video monitoring computer (112); the Ethernet switch I (105) is also connected with a PLC (106); the PLC controller (106) is connected to a configuration monitoring computer (113) through an Ethernet switch I (105), an Ethernet photoelectric converter I (104), a communication optical cable (107), an Ethernet photoelectric converter II (110) and an Ethernet switch II (111);
thirdly, fixing and protecting the electric heating film: the electrothermal film fixing and protecting device comprises an electrothermal film fixing and protecting device fixed on the gate and an electrothermal film fixing and protecting device fixed on the residual load:
the electric heating film fixing and protecting device fixed on the gate is fixed on the outer side of a gate iron plate (9), the gate iron plate (9) is arc-shaped, the electric heating film fixing and protecting device comprises a protective shell (4) and a heating unit, the heating unit is located inside the protective shell (4), the shape of the protective shell (4) is matched with that of the gate iron plate (9), the left edge, the right edge and the lower edge of the protective shell are both welded on the gate iron plate (9), a gap for filling is reserved between the protective shell (4) and the gate iron plate (9), the upper edge of the protective shell (4) is open and provided with a protective shell cover (401), the protective shell cover (401) is installed on the gate iron plate (9) through a sealing rubber sheet (10) and a bolt (11), and a horn mouth installing hole (7) is further formed in the iron sheet; the heating unit comprises an aluminum silicate heat-insulating cotton layer (1), a universal glue layer (2), a tinplate (3), an electrothermal film (5) and a temperature sensor (6), the electrothermal film (5), the aluminum silicate heat-insulating cotton layer (1) and the tinplate (3) are sequentially arranged from the gate iron plate (4) to the outside, adjacent components are bonded into a whole through the universal glue layer (2), and the electrothermal film (5) and the temperature sensor (6) are tightly attached to the gate iron plate (4); the electric wire of the electric heating film (5) penetrates out of the aluminum silicate heat-insulating cotton layer (1) and extends out of the horn mouth mounting hole (7) to be connected with a circuit, and a water guide angle iron (8) is tightly fixed on the lower side of the electric heating film fixing protection device; the electrothermal film fixing and protecting device fixed on the residual load comprises an electrothermal film (5) and an aluminum silicate heat-insulating cotton layer (1), wherein the electrothermal film (5) is attached to a heating body, the aluminum silicate heat-insulating cotton layer (1) covers the outer side of the electrothermal film, and a temperature sensor (6) is further arranged on the inner side of the electrothermal film (5); the aluminum silicate heat-insulating cotton layer (1) is also wrapped with aluminum foil.
2. The mining heating system based on the graphene-carbon fiber electrothermal film of claim 1, characterized in that: the number n of the loads is 6.
3. The mining heating system based on the graphene-carbon fiber electrothermal film of claim 1, characterized in that: the temperature sensor (6) is a DS18B20 temperature sensor.
4. The mining heating system based on the graphene-carbon fiber electrothermal film of claim 1 or 3, wherein: the bus of the temperature sensor (6) adopts a shielding wire with the wire diameter larger than 0.75 mm.
5. The mining heating system based on the graphene-carbon fiber electrothermal film of claim 1 or 3, wherein: the temperature sensor (6) adopts a shielded 4-core twisted pair, one pair of wires is respectively connected with a ground wire and a signal wire, the other pair of wires is connected with a Vcc (voltage regulator) and a ground wire, and a shielding layer is grounded at a single point at a source end.
6. The mining heating system based on the graphene-carbon fiber electrothermal film of claim 1, characterized in that: the protective shell (4) is a 5mm iron plate, and a gap of 5cm is formed between the protective shell (4) and the gate iron plate (9).
CN202011020245.2A 2020-09-25 2020-09-25 Mining heating system based on graphene carbon fiber electrothermal film Pending CN112180822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011020245.2A CN112180822A (en) 2020-09-25 2020-09-25 Mining heating system based on graphene carbon fiber electrothermal film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011020245.2A CN112180822A (en) 2020-09-25 2020-09-25 Mining heating system based on graphene carbon fiber electrothermal film

Publications (1)

Publication Number Publication Date
CN112180822A true CN112180822A (en) 2021-01-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011020245.2A Pending CN112180822A (en) 2020-09-25 2020-09-25 Mining heating system based on graphene carbon fiber electrothermal film

Country Status (1)

Country Link
CN (1) CN112180822A (en)

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