CN115141640A - Coke oven coal charging car protection system after power failure and control method thereof - Google Patents
Coke oven coal charging car protection system after power failure and control method thereof Download PDFInfo
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- CN115141640A CN115141640A CN202110329492.9A CN202110329492A CN115141640A CN 115141640 A CN115141640 A CN 115141640A CN 202110329492 A CN202110329492 A CN 202110329492A CN 115141640 A CN115141640 A CN 115141640A
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- 239000003245 coal Substances 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 66
- 239000000571 coke Substances 0.000 title claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 55
- 238000004146 energy storage Methods 0.000 claims abstract description 52
- 239000000428 dust Substances 0.000 claims description 44
- 230000002159 abnormal effect Effects 0.000 claims description 24
- 230000005284 excitation Effects 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 14
- 230000009471 action Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B41/00—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
- C10B41/005—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke for charging coal
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Abstract
The invention relates to a protection system for a coke oven coal charging car after power failure, which comprises a hydraulic energy storage system and a control system; the control system is used for controlling the hydraulic energy storage system, and the hydraulic energy storage system is used for continuously providing hydraulic energy for the hydraulic system after the coal feeding vehicle is powered off; the technical scheme solves the problem of safety accidents caused by power failure in the coal feeding process of the top-mounted coke oven coal feeding vehicle, is used for avoiding vehicle burning accidents and environment-friendly accidents caused by overflow of furnace top crude gas after the power failure of the coal feeding vehicle, and ensures the safety of vehicles and people.
Description
Technical Field
The invention relates to a protection system, in particular to a protection system for a coke oven coal charging car after power failure, and belongs to the technical field of electrical equipment control.
Background
The top-mounted coke oven coal charging car works on the top of the coke oven, and coal is conveyed into a coke oven carbonization chamber through the top coal charging hole through the operation flows of coal receiving, running alignment, spiral coal feeding and the like of the coal tower. Each flow action in the coal charging process of the coal charging car is mainly completed by controlling a hydraulic oil cylinder by a control system, a connection structure schematic diagram of the hydraulic and control system is shown in figure 1, the control system receives position state information of each oil cylinder, and logic judgment is carried out according to the flow where the coal charging car is located, so that sequential control of various oil cylinders and electrical equipment is realized. The hydraulic system converts electric energy provided by an external power supply into hydraulic energy to perform various mechanical actions, the structural diagram is shown in fig. 2, when the oil cylinder needs to act, a hydraulic motor drives a hydraulic pump to inject high-pressure hydraulic oil into a pipeline, and the control system controls a hydraulic valve to realize the action of the oil cylinder according to the work flow of the oil cylinder.
In the process of coal feeding to the carbonization chamber after the coal feeding car is aligned in the furnace area, the dust collecting cover is opened through a hydraulic system, the dust collecting connecting pipe extends out to be connected with a ground dust removing opening, then the outer sleeve is put down, the cover uncovering machine is put down, the furnace cover electromagnet is excited, the furnace cover is sucked up, the inner sleeve is put down, and the flashboard is opened to start spiral coal feeding. The flue gas generated in the coal feeding process is sucked into the ground dust removal system through the outer sleeve, the dust removal pipeline on the vehicle and the connecting pipe. Because the energy sources such as the control system, the hydraulic system, the limiting system and the like are all from an external power supply, once a power failure accident occurs, the electrical equipment of the coal charging car and the dust removal system is shut down, the suction force of the dust removal pipeline disappears, and the coal charging car cannot perform emergency operation on the driving equipment. Especially, when power failure occurs in the coal feeding process of the coal feeding vehicle, raw coal gas discharged to a carbonization chamber in a ground dust removal pipeline through a coal feeding vehicle jacket, a dust removal pipe and a connecting pipe directly overflows around a coal feeding port, combustible and explosive raw coal gas mixed with newly added coal powder directly gathers near the coal feeding port to cause explosion and combustion, the high-pollution and high-risk field environment also forces surrounding personnel to evacuate emergently, the emergency operation of manually plugging the coal feeding port cannot be implemented, and further diffusion of smoke and serious burning loss of the coal feeding vehicle are caused. Therefore, a new solution to solve the above technical problems is urgently needed.
Disclosure of Invention
The invention provides a protection system for a coke oven coal charging car after power failure, which aims at solving the problem of safety accidents caused by power failure in the coal charging process of a top-mounted coke oven coal charging car.
In order to achieve the aim, the technical scheme of the invention is that the protection system for the coke oven coal charging car after power failure comprises a hydraulic energy storage system and a control system; the control system is used for controlling the hydraulic energy storage system, and the hydraulic energy storage system is used for continuously providing hydraulic energy for the hydraulic system after the coal feeding vehicle is powered off.
As an improvement of the invention, the hydraulic energy storage system mainly comprises an energy accumulator, a pressure sensor, an energy storage electric valve and a hydraulic electric valve, wherein the energy accumulator is used for storing hydraulic energy during normal production and providing the hydraulic energy to the hydraulic system in abnormal states such as power failure; the pressure sensor is arranged on the energy accumulator and transmits the pressure of the energy accumulator to the control system, so that the control system can control the energy accumulator; the hydraulic electric valve is arranged on an output pipeline of the hydraulic pump, is controlled by the control system, and is opened when the hydraulic system works normally and pressurizes the energy accumulator, and is closed when the hydraulic system stops abnormally and the energy accumulator works; the energy storage electric valve is installed on an output pipeline of the energy accumulator, is controlled by the control system, and is opened when the hydraulic system is stopped abnormally and the energy accumulator is pressurized, and is closed when the hydraulic system works normally. When the coal charging car normally works (the power supply system is normal), the hydraulic electric valve is opened, the energy storage electric valve is closed, and the hydraulic pump provides high-pressure hydraulic pressure for the hydraulic system. When the control system detects that the internal pressure of the energy accumulator is smaller than the set pressure, the hydraulic electric valve and the hydraulic electric valve are opened simultaneously, the hydraulic pump charges the pressure in the energy accumulator, and the energy accumulation electric valve is closed until the pressure of the energy accumulator reaches the set value to stop charging. When the power supply system of the coal charging car is abnormal, the hydraulic electric valve is closed, the energy storage electric valve is opened, and the energy accumulator provides high-pressure hydraulic pressure for the hydraulic system.
As an improvement of the invention, the control system mainly comprises an Uninterruptible Power Supply (UPS), a controller, a power failure identification circuit, a signal input end, an instruction output end and a fireproof cable, wherein the UPS supplies power to the controller, the power failure identification circuit, the signal input end and the instruction output end through the fireproof cable, so that the Uninterrupted Power Supply (UPS) can continuously provide signal input and instruction output and drive corresponding electromagnetic valves under the condition of power failure of a power supply, the power failure identification circuit is arranged near a main power supply connection position of the coal charging car, and an auxiliary contact on the UPS is connected with the signal input end to judge the abnormal state of the UPS.
As an improvement of the invention, a two-phase relay TD is connected to an incoming line power supply of the coal charging car, if the incoming line power supply is normal, a relay coil TD is electrified to be attracted so that a normally closed contact is disconnected, if the incoming line power supply is abnormal, the coil TD is electrified to be released so that the normally closed contact is in a closed state, the power supply state of the coal charging car can be fed back to a signal input end of a control system through the on-off of an auxiliary contact of the relay TD, and the signal input end is connected with the signals of limit and power failure identification circuits of various oil cylinders through fireproof cables to acquire the state signals of the coal charging car and transmit the signals to a controller. In order to ensure the reliability of logic judgment of the controller, a power supply system, a furnace cover, the upper and lower parts of a cover opening machine, the upper and lower parts of an inner sleeve, the upper and lower parts of an outer sleeve, the opening and closing of a flashboard, the front and rear limit signals of a connecting pipe, the front and rear limit signals of a dust collecting cover, an energy accumulator pressure signal and the like are sent to a signal input end of the control system, and all signal working power supplies of an input circuit are from a UPS. The instruction output end is used for receiving a control instruction sent by the controller, the emergency application relay, the flashboard closing electromagnetic valve, the inner sleeve lifting electromagnetic valve, the cover opening machine lower electromagnetic valve, the excitation relay, the cover opening machine upper electromagnetic valve, the outer sleeve lifting electromagnetic valve, the connecting pipe receiving electromagnetic valve, the dust collection cover receiving electromagnetic valve, the hydraulic valve closing electromagnetic valve and the energy storage valve opening electromagnetic valve are connected through a fireproof cable, so that functions of keeping the furnace cover sucker energized, giving an alarm when power failure occurs and giving an alarm when the cover is applied emergently, sequentially executing closing of the hydraulic valve, opening of the energy storage valve, closing of the flashboard, lifting of the inner sleeve, putting down the cover opening machine, releasing of the furnace cover, folding up the cover, lifting of the outer sleeve, folding up of the connecting pipe and the dust collection cover and the like are realized, and all signal working power supplies of an output circuit are from the UPS.
A control method of a protection system of a coke oven coal charging car after power failure comprises the following steps: the logic control method is used for identifying the abnormal situation of power failure in the coal feeding process of the coal feeding car and can immediately implement automatic safety protection according to a set logic sequence after judging the abnormal situation of power failure. In the method, in the coal feeding process of the coal feeding car during positioning, parking and coal feeding, the coal feeding car is set to enter a coal feeding process state from the time of opening the dust removal cover, the coal feeding car coal feeding process state is cancelled until the coal feeding car closes the dust removal cover to the rear limit, the controller judges whether a power supply system of the coal feeding car is abnormal according to a signal acquired by the power failure identification circuit, and whether an automatic emergency protection measure is executed or not is determined by confirming whether the coal feeding car enters the coal feeding process state or not under the condition that the power supply system is abnormal; if the coal feeding car works in a non-coal feeding process during power failure, the coal feeding car control system does not automatically execute an emergency operation process, the emergency operation process is only required to be waited for power supply to recover again, if the coal feeding car enters the coal feeding process during power failure, the coal feeding car control system automatically executes the emergency operation process, a logic judgment flow chart is adopted, the control system continuously monitors the working process of the coal feeding car, when external power supply is normal, the hydraulic system works by means of power provided by a power supply, the control system controls pressure in an energy accumulator by detecting the pressure value of the energy accumulator to ensure that hydraulic energy can be provided under emergency, and in the process of exciting a suction furnace cover, an output circuit LC of the emergency operation system and an original circuit switch are kept in a synchronous state; when external power supply is powered off and the coal charging car is in a coal charging process state, due to the fact that the UPS supplies power, the input end and the output end of the control system can still keep the original state, the output end excitation switch LC continues to attract, the furnace cover is kept not to fall off, the power-off coil TD loses power, the normally closed auxiliary contact TD is closed, and power failure alarm is sent out. The emergency application relay JJ outputs, a normally closed auxiliary contact JJ on an original output circuit is disconnected, and a normally open auxiliary contact JJ on an emergency output circuit is closed, so that an emergency application alarm is sounded; the control system closes the hydraulic valves according to a set logic control sequence, opens the energy storage valve, realizes that the energy accumulator provides high-pressure hydraulic pressure for the hydraulic system, and controls the hydraulic valves to sequentially operate the oil cylinders to carry out emergency operation.
As an improvement of the invention, the emergency operation comprises the following specific steps: a. firstly, closing the spiral coal feeding gate, wherein the output instruction maintaining time is not less than 3 seconds, the inner sleeve is lifted, and the output instruction maintaining time is not less than 3 seconds; b. after the inner sleeve upper limit reaches or the inner sleeve is lifted for more than 3 seconds, the cover uncovering machine is put down, and the output instruction maintaining time is not less than 3 seconds; c. after the lower limit of the uncovering machine reaches or the time for putting down exceeds 3 seconds, the excitation switch LC is released, and the furnace cover is covered on the coal feeding port again to avoid the open fire from emitting; d. lifting the cover lifting machine again, and outputting an instruction to maintain the time not less than 3 seconds; e. lifting the outer sleeve after the cover lifting machine reaches the upper limit and no cover signal is confirmed or the lifting time of the cover lifting machine exceeds 3 seconds, and outputting an instruction to maintain the time to be not less than 2 seconds; f. after the upper limit of the outer sleeve reaches or is lifted for more than 2 seconds, the dust collecting cover begins to retreat, and the output instruction maintaining time is not less than 10 seconds; g. when the dust collection cover reaches the rear limit or the retreating time exceeds 12 seconds, the dust removal connecting pipe retreats, and the output instruction maintaining time is not less than 10 seconds; h. after the dust removal connecting pipe reaches the rear limit or retreats for more than 12 seconds, the emergency operation process is ended, the energy storage valve is closed, and power supply recovery is waited. The process sequence ensures that the key oil cylinder action is preferentially executed under the condition that the energy storage capacity of the energy accumulator is limited, the furnace cover is firstly placed back when power is cut off, the execution of the action of each executing mechanism is ensured by maintaining specific instruction output time and time interval in consideration of the conditions of limit abnormity or cable burning loss and the like under emergency conditions, the coal-feeding vehicle is prevented from being burnt due to the power failure of a power supply system in the coal-feeding process, and the safety production of the coal-feeding vehicle is ensured.
Compared with the prior art, the technical scheme solves the problem of safety accidents caused by power failure in the coal feeding process of the top-mounted coke oven coal feeding car, avoids vehicle burning accidents and environmental protection accidents caused by overflow of furnace top crude gas after the coal feeding car has power failure, and ensures vehicle and personal safety. Has the following advantages: 1. the operation process sequence ensures that the key oil cylinder action is preferentially executed under the condition that the energy storage capacity of the energy accumulator is limited, and firstly ensures that the furnace cover is put back when power is off; 2. the method comprises the following steps of considering the situations of limit abnormity, cable burning and the like in emergency, and ensuring the execution of the actions of each execution mechanism by maintaining specific command output time and time interval; 3. the power failure state and the coal charging car state are automatically identified, the execution condition of emergency protection is automatically judged, and misoperation is avoided.
Drawings
FIG. 1 is a block diagram of a hydraulic and control system;
FIG. 2 is a schematic diagram of a hydraulic system;
FIG. 3 is a block diagram of a hydraulic energy storage system;
FIG. 4 is a circuit diagram of a signal input;
FIG. 5 is a circuit diagram of an instruction output circuit;
fig. 6 is a flow chart of emergency operation logic determination.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, a protection system for a coke oven coal charging car after power failure comprises a hydraulic energy storage system and a control system; the control system is used for controlling the hydraulic energy storage system, the hydraulic energy storage system is used for continuously providing hydraulic energy for the hydraulic system after the coal charging car is powered off, the hydraulic energy storage system mainly comprises an energy accumulator, a pressure sensor, an energy storage electric valve and a hydraulic electric valve, and the energy accumulator is used for storing the hydraulic energy during normal production and providing the hydraulic energy for the hydraulic system in abnormal states such as power failure; the pressure sensor is arranged on the energy accumulator and transmits the pressure of the energy accumulator to the control system, so that the control system can control the energy accumulator; the hydraulic electric valve is arranged on an output pipeline of the hydraulic pump, is controlled by the control system, and is opened when the hydraulic system works normally and pressurizes the energy accumulator, and is closed when the hydraulic system stops abnormally and the energy accumulator works; the energy storage electric valve is arranged on an output pipeline of the energy accumulator and is controlled by the control system to be opened when the hydraulic system is abnormally stopped and the energy accumulator is pressurized and to be closed when the hydraulic system normally works. When the coal charging car normally works (the power supply system is normal), the hydraulic electric valve is opened, the energy storage electric valve is closed, and the hydraulic pump provides high-pressure hydraulic pressure for the hydraulic system. When the control system detects that the internal pressure of the energy accumulator is smaller than the set pressure, the hydraulic electric valve and the hydraulic electric valve are opened simultaneously, the hydraulic pump charges the pressure in the energy accumulator, and the energy accumulation electric valve is closed until the pressure of the energy accumulator reaches the set value to stop charging. When a coal charging car power supply system is abnormal, the hydraulic electric valve is closed, the energy storage electric valve is opened, the energy accumulator provides high-pressure hydraulic pressure for the hydraulic system, the control system mainly comprises an Uninterruptible Power Supply (UPS), a controller, a power failure recognition circuit, a signal input end, an instruction output end and a fireproof cable, the UPS supplies power to the controller, the power failure recognition circuit, the signal input end and the instruction output end through the fireproof cable, the UPS can continuously provide signal input, instruction output and drive corresponding electromagnetic valves under the condition that power supply is cut off, the power failure recognition circuit is installed near a main power supply wiring position of the coal charging car, an auxiliary contact on the UPS is connected with the signal input end to judge the abnormal state of the power supply system, a circuit diagram is shown in figure 4, a two-phase relay TD is connected to an incoming line power supply of the coal charging car, if the incoming line power supply is normal, the relay coil TD is powered to attract a normally closed contact to be disconnected, if the incoming line power supply is abnormal, the TD is electrically released to enable the normally closed contact to be in a closed state, the power supply state of the coal charging car can be fed back to the power supply state of the control system through the relay auxiliary contact, the signal input end is connected with the oil cylinder and the oil cylinder to acquire a limit signal of the coal charging car through the fireproof cable to acquire the signal to control system. In order to ensure the reliability of logic judgment of the controller, a power supply system, a furnace cover, the upper and lower parts of a cover opening machine, the upper and lower parts of an inner sleeve, the upper and lower parts of an outer sleeve, the opening and closing of a flashboard, the front and rear limit signals of a connecting pipe, the front and rear limit signals of a dust collecting cover, an energy accumulator pressure signal and the like are sent to a signal input end of the control system, and all signal working power supplies of an input circuit are from a UPS. The instruction output end is used for receiving a control instruction sent by the controller, the emergency application relay, the flashboard closing electromagnetic valve, the inner sleeve lifting electromagnetic valve, the cover uncovering machine lower electromagnetic valve, the excitation relay, the cover uncovering machine upper electromagnetic valve, the outer sleeve lifting electromagnetic valve, the connecting pipe receiving electromagnetic valve, the dust collection cover receiving electromagnetic valve, the hydraulic valve closing electromagnetic valve and the energy storage valve opening electromagnetic valve are connected through a fireproof cable, functions of keeping the furnace cover sucker energized, alarming for power failure and alarming for emergency application, sequentially executing closing of the hydraulic valve, opening of the energy storage valve, closing of the flashboard, lifting of the inner sleeve, putting down of the cover uncovering machine, releasing of the furnace cover, folding up of the outer sleeve, folding of the connecting pipe and the dust collection cover are achieved, all signal working power sources of an output circuit are from the UPS, and a circuit diagram is shown in figure 5.
Example 2: referring to fig. 1, a control method of a protection system after a power failure of a coke oven coal charging car comprises the following steps: the logic control method is used for identifying the abnormal power failure condition in the coal feeding process of the coal feeding car, and can immediately implement automatic safety protection according to a set logic sequence after judging the abnormal power failure condition. In the method, in the coal feeding process of the coal feeding car positioning parking, the coal feeding car is set to enter a coal feeding process state from the start of opening a dust removal cover, the coal feeding car coal feeding process state is cancelled until the coal feeding car closes the dust removal cover to reach the rear limit, a controller judges whether a power supply system of the coal feeding car is abnormal according to a signal acquired by a power failure identification circuit, and whether an automatic emergency protection measure is executed or not is determined by confirming whether the coal feeding car enters the coal feeding process state or not under the condition that the power supply system is abnormal; if the coal feeding car works in the non-coal feeding process during power failure, the coal feeding car control system does not automatically execute the emergency operation process, only needs to wait for the power supply to be recovered again, and if the coal feeding car enters the coal feeding process during power failure, the coal feeding car control system automatically executes the emergency operation process, and the logic judgment flow chart is shown in fig. 6. The control system continuously monitors the working process of the coal charging car, when external power supply is normal, the hydraulic system works by means of power provided by the power supply, the control system controls the pressure in the energy accumulator by detecting the pressure value of the energy accumulator to ensure that hydraulic energy can be provided under emergency, and in the process of absorbing the furnace cover by excitation, an output circuit LC of the emergency operation system and an original circuit switch are kept in a synchronous state; when external power supply is powered off and the coal charging car is in a coal charging process state, due to the fact that the UPS supplies power, the input end and the output end of the control system can still keep the original state (see fig. 4 and 5), the excitation switch LC at the output end is continuously attracted, the furnace cover is kept not to fall off, the power-off coil TD loses power, the normally closed auxiliary contact TD is closed, and power failure alarm is sent out. The emergency application relay JJ outputs, a normally closed auxiliary contact JJ on an original output circuit is disconnected, and a normally open auxiliary contact JJ on an emergency output circuit is closed, so that an emergency application alarm is sounded; the control system closes the hydraulic valves according to a set logic control sequence, opens the energy storage valve, realizes that the energy accumulator provides high-pressure hydraulic pressure for the hydraulic system, and controls the hydraulic valves to sequentially operate the oil cylinder for emergency operation, wherein the emergency operation comprises the following specific steps: a. firstly, closing the spiral coal feeding gate, wherein the output instruction maintaining time is not less than 3 seconds, the inner sleeve is lifted, and the output instruction maintaining time is not less than 3 seconds; b. after the inner sleeve upper limit reaches or the inner sleeve is lifted for more than 3 seconds, the cover uncovering machine is put down, and the output instruction maintaining time is not less than 3 seconds; c. after the lower limit of the cover uncovering machine reaches or is put down for more than 3 seconds, the excitation switch LC is released, and the furnace cover is covered on the coal feeding port again to avoid the open fire from emerging; d. lifting the cover lifting machine again, and outputting an instruction to maintain the time not less than 3 seconds; e. lifting the outer sleeve after the cover opener reaches the upper limit and confirms that no cover signal exists or the lifting time of the cover opener exceeds 3 seconds, and outputting an instruction to maintain the time not less than 2 seconds; f. after the upper limit of the outer sleeve reaches or is lifted for more than 2 seconds, the dust collecting cover begins to retreat, and the output instruction maintaining time is not less than 10 seconds; g. when the dust collection cover reaches the rear limit or the retreating time exceeds 12 seconds, the dust removal connecting pipe retreats, and the output instruction maintaining time is not less than 10 seconds; h. and after the dust removal connecting pipe reaches the rear limit or the retreat time exceeds 12 seconds, ending the emergency operation process, closing the energy storage valve and waiting for power supply recovery. The process sequence ensures that the key oil cylinder action is preferentially executed under the condition that the energy storage capacity of the energy accumulator is limited, the furnace cover is firstly placed back when power is cut off, the execution of the action of each executing mechanism is ensured by maintaining specific instruction output time and time interval in consideration of the conditions of limit abnormity or cable burning loss and the like under emergency conditions, the coal-feeding vehicle is prevented from being burnt due to the power failure of a power supply system in the coal-feeding process, and the safety production of the coal-feeding vehicle is ensured.
The working principle is as follows: referring to fig. 1-6, a hydraulic energy storage system added to the hydraulic system of the original coal charging car is shown in fig. 3, and mainly comprises an energy accumulator, a pressure sensor, an energy storage electric valve, a hydraulic electric valve and the like. The energy storage device is used for providing hydraulic energy for the hydraulic system when in an abnormal state, the pressure sensor is installed on the energy storage device and transmits the pressure of the energy storage device to the control system, the hydraulic electric valve is installed on an output pipeline of the hydraulic pump, and the energy storage electric valve is installed on the output pipeline of the energy storage device. When the coal charging car normally works, the hydraulic electric valve is opened, the energy storage electric valve is closed, and the hydraulic pump provides high-pressure hydraulic pressure for the hydraulic system. When the control system detects that the internal pressure of the energy accumulator is less than the set pressure of 5MP, the hydraulic electric valve and the hydraulic electric valve are opened simultaneously, the hydraulic pump charges the pressure in the energy accumulator, and the energy accumulation electric valve is closed to stop charging until the pressure of the energy accumulator reaches the set value of 5 MP. When the power supply system of the coal charging car is abnormal, the hydraulic electric valve is closed, the energy storage electric valve is opened, and the energy accumulator provides high-pressure hydraulic pressure for the hydraulic system.
A circuit device for recognizing system power failure and a signal input end circuit of a control system are designed according to the design shown in figure 4, a two-phase relay TD is connected to an incoming line power supply of a coal charging car, if the incoming line power supply is normal, a relay coil TD is electrified and attracted to enable a normally closed contact to be disconnected, and if the incoming line power supply is abnormal, the relay coil TD is electrified and released to enable the normally closed contact to be in a closed state, and signals are connected to an input circuit of the control system. The signals to be collected in the embodiment comprise power failure signals, furnace cover signals, an upper limit of a cover carriage, a lower limit of the cover carriage, a flashboard opening limit, a flashboard closing limit, an upper limit of an inner sleeve, a lower limit of the inner sleeve, an upper limit of an outer sleeve, a lower limit of the inner sleeve, a front limit of a connecting pipe, a rear limit of the connecting pipe, a front limit of a dust collecting cover, a rear limit of the dust collecting cover and pressure signals of an energy accumulator. The signal can still supply power through the UPS after the system is powered off, and the feedback of the state information of the main equipment of the coal charging car to the control system is ensured.
The command output end circuit of the control system is designed as shown in fig. 5, and the commands to be output in the embodiment comprise emergency use, closing of a flashboard, lifting of an inner sleeve, downward lifting of a cover uncovering machine, excitation, upward lifting of the cover uncovering machine, lifting of an outer sleeve, collection of a connecting pipe, collection of a dust cover, closing of a hydraulic valve and opening of an energy storage valve. All signal working power supplies of the output circuit are from the UPS, so that the control state of important equipment before power failure can be kept, and the reliable input of the emergency operation function is ensured. By controlling the auxiliary relay, the functions of keeping the furnace cover sucker energized, giving an alarm when power is cut off, giving an alarm when the furnace cover sucker is in emergency, sequentially closing the hydraulic valve, opening the energy storage valve, closing the flashboard, lifting the inner sleeve, putting down the cover lifting machine, releasing the furnace cover, retracting the cover lifting machine, lifting the outer sleeve, retracting the connecting pipe and the dust collection cover and the like are realized.
According to the logic flow shown in fig. 6, an emergency operation program is written, in this example, the coal charging car is set to enter the state of the coal charging flow from the time when the dust removal cover is opened, and the state of the coal charging car is not cancelled until the coal charging car closes the dust removal cover to reach the rear limit. When the external power supply is normal, the hydraulic system works by means of power provided by the power supply, the control system controls the pressure in the energy accumulator by detecting the pressure value of the energy accumulator, the pressure is maintained to be more than 5MP, and the hydraulic energy can be provided under the emergency condition. In the process of the excitation suction furnace cover, an output circuit LC of the emergency operation system and an original circuit switch are kept in a synchronous state. When external power supply is powered off and the coal charging car is in a coal charging process state, due to the fact that the UPS supplies power, the input end and the output end of the control system can still keep the original state (see fig. 4 and 5), the excitation switch LC at the output end is continuously attracted, the furnace cover is kept not to fall off, the power-off coil TD loses power, the normally closed auxiliary contact TD is closed, and power failure alarm is sent out. And the emergency application relay JJ outputs to break a normally closed auxiliary contact JJ on the original output circuit and close a normally open auxiliary contact JJ on the emergency output circuit, so that the emergency application alarm is sounded. The control system closes the hydraulic valves according to a set logic control sequence, opens the energy storage valve, realizes that the energy accumulator provides high-pressure hydraulic pressure for the hydraulic system, and controls the hydraulic valves to sequentially operate the oil cylinders to perform the following emergency operations: 1. firstly, closing the spiral coal feeding gate, wherein the output instruction maintaining time is not less than 3 seconds, the inner sleeve is lifted, and the output instruction maintaining time is not less than 3 seconds; b. after the inner sleeve upper limit reaches or the inner sleeve is lifted for more than 3 seconds, the cover uncovering machine is put down, and the output instruction maintaining time is not less than 3 seconds; c. after the lower limit of the uncovering machine reaches or the time for putting down exceeds 3 seconds, the excitation switch LC is released, and the furnace cover is covered on the coal feeding port again to avoid the open fire from emitting; d. lifting the cover lifting machine again, and outputting an instruction for maintaining the time to be not less than 3 seconds; e. lifting the outer sleeve after the cover opener reaches the upper limit and confirms that no cover signal exists or the lifting time of the cover opener exceeds 3 seconds, and outputting an instruction to maintain the time not less than 2 seconds; f. after the upper limit of the outer sleeve reaches or is lifted for more than 2 seconds, the dust collecting cover begins to retreat, and the output instruction maintaining time is not less than 10 seconds; g. when the dust collection cover reaches the rear limit or the retreating time exceeds 12 seconds, the dust removal connecting pipe retreats, and the output instruction maintaining time is not less than 10 seconds; h. and after the dust removal connecting pipe reaches the rear limit or the retreat time exceeds 12 seconds, ending the emergency operation process, closing the energy storage valve and waiting for power supply recovery.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications or substitutions based on the above-mentioned technical solutions are included in the scope of the present invention.
Claims (6)
1. A protection system for a coke oven coal charging car after power failure is characterized by comprising a hydraulic energy storage system and a control system; the control system is used for controlling the hydraulic energy storage system, and the hydraulic energy storage system is used for continuously providing hydraulic energy for the hydraulic system after the coal charging car is powered off.
2. The coke oven coal charging car protection system after power failure as claimed in claim 1, wherein the hydraulic energy storage system mainly comprises an energy accumulator, a pressure sensor, an energy storage electric valve and a hydraulic electric valve, the energy accumulator is used for storing hydraulic energy during normal production and providing hydraulic energy for the hydraulic system in abnormal states such as power failure; the pressure sensor is arranged on the energy accumulator and transmits the pressure of the energy accumulator to the control system, so that the control system can control the energy accumulator; the hydraulic electric valve is arranged on an output pipeline of the hydraulic pump, is controlled by the control system, and is opened when the hydraulic system works normally and pressurizes the energy accumulator, and is closed when the hydraulic system stops abnormally and the energy accumulator works; the energy storage electric valve is arranged on an output pipeline of the energy accumulator and is controlled by the control system to be opened when the hydraulic system is abnormally stopped and the energy accumulator is pressurized and to be closed when the hydraulic system normally works.
3. The coke oven coal charging car protection system after power failure as claimed in claim 2, wherein the control system mainly comprises an uninterruptible power supply system (UPS), a controller, a power failure identification circuit, a signal input terminal, a command output terminal and a fireproof cable, the UPS supplies power to the controller, the power failure identification circuit, the signal input terminal and the command output terminal through the fireproof cable, so as to ensure that each system can continue to provide signal input, command output and drive corresponding electromagnetic valves under the condition of power failure, the power failure identification circuit is installed near the main power supply connection position of the coal charging car, and an auxiliary contact on the power failure identification circuit is connected to the signal input terminal to judge the abnormal state of the power supply system.
4. The coke oven coal feeding car protection system after power failure as claimed in claim 3, wherein the two-phase relay TD is connected to the incoming power supply of the coal feeding car, if the incoming power supply is normal, the relay coil TD is electrified and actuated to disconnect the normally closed contact, if the incoming power supply is abnormal, the coil TD is deenergized and released to make the normally closed contact in a closed state, the power supply state of the coal feeding car can be fed back to the signal input end of the control system by switching on and off the relay TD auxiliary contact, the signal input end is connected with the oil cylinder limit and power failure identification circuit signals through the fireproof cable to collect the state signals of the coal feeding car and transmit the signals to the controller, and the power supply system, the furnace cover, the cover opening and closing machine, the inner and closing devices, the connecting pipe front and back, the dust collecting cover front and back limit signals and the accumulator pressure signals are transmitted to the signal input end of the control system, all signal working power supplies of an input circuit come from a UPS, an instruction output end is used for receiving a control instruction sent by a controller, and all signal working power supplies of an output circuit come from the UPS.
5. The control method for the protection system of the coke oven coal charging car after power failure by adopting any one of the claims 1 to 4 is characterized by comprising the following steps:
in the coal feeding process of the coal feeding car positioning parking, the coal feeding car is set to enter a coal feeding process state from the start of opening the dust removal cover, the coal feeding car coal feeding process state is cancelled until the coal feeding car closes the dust removal cover to reach the rear limit, the controller judges whether a power supply system of the coal feeding car is abnormal according to signals collected by the power failure identification circuit, and whether an automatic emergency protection measure is executed or not is determined by confirming whether the coal feeding car enters the coal feeding process state or not under the condition that the power supply system is abnormal; if the coal feeding car works in a non-coal feeding process during power failure, the coal feeding car control system does not automatically execute an emergency operation process, the emergency operation process is only required to be executed after power supply is recovered again, if the coal feeding car enters the coal feeding process during power failure, the coal feeding car control system automatically executes the emergency operation process, the control system continuously monitors the working process of the coal feeding car, when external power supply is normal, the hydraulic system works by means of power provided by a power supply, the control system controls the pressure in the energy accumulator by detecting the pressure value of the energy accumulator, hydraulic energy is guaranteed to be provided under emergency, and in the process of exciting the suction furnace cover, an output circuit LC of the emergency operation system and an original circuit switch are kept in a synchronous state; when external power supply is powered off and the coal charging car is in a coal charging process state, due to the fact that UPS supplies power, the input end and the output end of the control system can still keep the original state, the excitation switch LC of the output end is continuously attracted, the furnace cover is kept not to fall off, the power-off coil TD loses power, the normally closed auxiliary contact TD is closed, and power failure alarm is sent out; the emergency commissioning relay JJ outputs, a normally closed auxiliary contact JJ on an original output circuit is disconnected, and a normally open auxiliary contact JJ on an emergency output circuit is closed, so that an emergency commissioning alarm is sounded; the control system closes the hydraulic valves according to a set logic control sequence, opens the energy storage valve, realizes that the energy accumulator provides high-pressure hydraulic pressure for the hydraulic system, and controls the hydraulic valves to sequentially operate the oil cylinders to carry out emergency operation.
6. The control method of the protection system of the coke oven coal charging car after the power failure as claimed in claim 5, characterized in that the specific steps of the emergency operation are as follows: a. firstly, closing the spiral coal feeding gate, wherein the output instruction maintaining time is not less than 3 seconds, the inner sleeve is lifted, and the output instruction maintaining time is not less than 3 seconds; b. after the inner sleeve upper limit reaches or the inner sleeve is lifted for more than 3 seconds, the cover uncovering machine is put down, and the output instruction maintaining time is not less than 3 seconds; c. after the lower limit of the uncovering machine reaches or the time for putting down exceeds 3 seconds, the excitation switch LC is released, and the furnace cover is covered on the coal feeding port again to avoid the open fire from emitting; d. lifting the cover lifting machine again, and outputting an instruction to maintain the time not less than 3 seconds; e. lifting the outer sleeve after the cover opener reaches the upper limit and confirms that no cover signal exists or the lifting time of the cover opener exceeds 3 seconds, and outputting an instruction to maintain the time not less than 2 seconds; f. after the upper limit of the outer sleeve reaches or is lifted for more than 2 seconds, the dust collecting cover begins to retreat, and the output instruction maintaining time is not less than 10 seconds; g. when the dust collection cover reaches the rear limit or the retreating time exceeds 12 seconds, the dust removal connecting pipe retreats, and the output instruction maintaining time is not less than 10 seconds; h. and after the dust removal connecting pipe reaches the rear limit or the retreat time exceeds 12 seconds, ending the emergency operation process, closing the energy storage valve and waiting for power supply recovery.
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| CN202110329492.9A CN115141640A (en) | 2021-03-28 | 2021-03-28 | Coke oven coal charging car protection system after power failure and control method thereof |
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| CN202110329492.9A CN115141640A (en) | 2021-03-28 | 2021-03-28 | Coke oven coal charging car protection system after power failure and control method thereof |
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