CN112251243B - Coke oven heating system and exchange heating control method thereof - Google Patents
Coke oven heating system and exchange heating control method thereof Download PDFInfo
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- CN112251243B CN112251243B CN202011106797.5A CN202011106797A CN112251243B CN 112251243 B CN112251243 B CN 112251243B CN 202011106797 A CN202011106797 A CN 202011106797A CN 112251243 B CN112251243 B CN 112251243B
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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
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/04—Heating of coke ovens with combustible gases with rich gas
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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
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
- C10B21/12—Burners
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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
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
- C10B21/16—Regulating and controlling the combustion by controlling or varying the openings between the heating flues and the regenerator flues
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Abstract
The invention discloses a coke oven heating system.A limit switch is respectively arranged at the movement limit positions at two ends of a piston rod of each hydraulic oil cylinder; two ends of the piston rod are respectively provided with a piston rod flange; when the piston rod flange moves to the limit position, the piston rod flange triggers the corresponding limit switch; the limit switch obtains the information of the actual state of the movement of the piston of the hydraulic oil cylinder and sends the information to a control unit of the coke oven heating system. The invention also discloses an exchange heating control method of the heating system. According to the invention, the hydraulic fault is analyzed and diagnosed by optimizing the safety chain and adding the oil circuit pressure detection device, so that the major potential safety hazard of the heating system when the hydraulic system is in fault in the prior art is eliminated, the hydraulic fault of the coal gas heating system can be timely identified, the safety stop is carried out, and the safety performance of the coke oven heating system is effectively improved.
Description
Technical Field
The invention belongs to the technical field of coke oven production equipment control. More particularly, the present invention relates to a coke oven heating system, and more particularly to a system programming for a control method for exchange heating of a 7.63m coke oven.
Background
The horse steel 7.63m coke oven is a super-large coke oven introduced in the first country, and the technical scheme of a heating exchange system of the coke oven is provided by a German UHDE company. The system drives the gas exchange cock through the hydraulic oil cylinder to realize the alternate reversing heating of the duplex fire paths. The coal gas exchange sequence is that coal gas is firstly closed, then air and waste gas are exchanged, and finally coal gas is opened, wherein the exchange frequency is 20 min/time.
During exchange, the residual gas in the furnace must be completely combusted, and enough air is stored in the combustion chamber, so that the gas can be immediately combusted after entering; and can effectively prevent coal gas and air from simultaneously entering the furnace, and especially prevent the coal gas and the air from meeting in the regenerator to explode when the lean coal gas is heated.
In the heating gas exchange system in the prior art, when a hydraulic system executing actions fails, a malfunction that two oil cylinders are started simultaneously or a malfunction that a backward gas hydraulic oil cylinder is started before a waste gas hydraulic oil cylinder may occur, so that gas explosion occurs at a regenerative chamber or a flue part of a coke oven.
The coke oven with the size of 7.63m is provided with 70 carbonization chambers, gas enters a combustion chamber corresponding to the odd number, and waste gas discharged from the combustion chamber corresponding to the even number is defined as red phase heating; on the contrary, the gas is fed into the combustion chamber corresponding to the even number, and the exhaust gas from the combustion chamber corresponding to the odd number is defined as green phase heating. The red phase is converted into the green phase, namely, odd number heating is converted into even number heating; the green phase is converted into the red phase, namely, the heating of an even number is converted into the heating of an odd number.
Disclosure of Invention
The invention provides a coke oven heating system, and aims to find out and effectively prevent the misoperation of a hydraulic oil cylinder of a heating exchange system in time and avoid major gas safety accidents.
In order to achieve the purpose, the invention adopts the technical scheme that:
the coke oven heating system comprises a plurality of combustion chambers, and adopts double-linkage flame paths to alternately change direction for heating, namely the combustion chambers are divided into two groups and respectively switched into two working states, namely: when the first working state is switched, the first group of combustion chambers feed gas, and the second group of combustion chambers discharge waste gas; on the contrary, when the second working state is switched, the second group of combustion chambers enters gas, and the first group of combustion chambers discharges waste gas;
the coke oven heating system comprises a hydraulic system, wherein the hydraulic system is provided with three hydraulic oil cylinders, namely a C6 hydraulic oil cylinder for controlling the first group of combustion chambers to open and close gas, a C7 hydraulic oil cylinder for controlling the second group of combustion chambers to open and close gas and a C4 hydraulic oil cylinder for controlling waste gas reversing;
limit switches are respectively arranged at the movement limit positions at the two ends of the piston rod of each hydraulic oil cylinder; piston rod flanges are respectively arranged at two ends of the piston rod; when the piston rod flange moves to the limit position, the piston rod flange triggers the corresponding limit switch; the limit switch obtains the information of the actual state of the movement of the piston of the hydraulic oil cylinder and sends the information to a control unit of the coke oven heating system.
The hydraulic system is provided with an electromagnetic directional valve;
when the electromagnetic directional valve is in the first working state conversion, a hydraulic oil pipe of an oil inlet path of the hydraulic system is communicated with a closed gas oil cavity of a C6 hydraulic oil cylinder;
then the first oil cavity of the C4 hydraulic oil cylinder is communicated with the first position valve; then is communicated with an opening gas oil cavity of a C7 hydraulic oil cylinder through a second position valve;
when a piston rod flange of the C6 hydraulic oil cylinder triggers a limit switch for closing gas, the first position valve is pressed down at the same time to conduct an oil way; after the oil is fed into the first oil cavity of the C4 hydraulic oil cylinder in place, when the piston rod flange triggers the corresponding limit switch, the second position valve is pressed down to conduct the oil circuit.
A tee joint is arranged on a hydraulic oil pipe which is communicated with a C6 hydraulic oil cylinder and used for closing a gas oil cavity of the electromagnetic directional valve, and the tee joint is connected with a pressure gauge through a pressure guiding pipe; a tee joint is arranged on a hydraulic oil pipe of the first position valve, which is communicated with a first oil cavity of the C4 hydraulic oil cylinder, and the tee joint is connected with a pressure gauge through a pressure guiding pipe; and a tee joint is arranged on a hydraulic oil pipe which opens a gas oil chamber and is communicated with the C7 hydraulic oil cylinder by the second position valve, and the tee joint is connected with a pressure gauge by a pressure guiding pipe.
When the electromagnetic directional valve is in the second working state conversion, a hydraulic oil pipe of an oil inlet path of the hydraulic system is communicated with a closed gas oil cavity of a C7 hydraulic oil cylinder;
then the oil inlet valve is communicated with a second oil cavity of the C4 hydraulic oil cylinder through a third position valve; then is communicated with an opening gas oil cavity of a C6 hydraulic oil cylinder through a fourth position valve;
when a piston rod flange of the C7 hydraulic oil cylinder triggers a limit switch for closing gas, the third position valve is pressed down at the same time to conduct an oil way; after the oil is fed into the first oil cavity of the C4 hydraulic oil cylinder in place, when the piston rod flange triggers the corresponding limit switch, the fourth position valve is pressed down simultaneously to conduct the oil circuit.
A tee joint is arranged on a hydraulic oil pipe which is communicated with a C7 hydraulic oil cylinder and used for closing a gas oil cavity of the electromagnetic directional valve, and the tee joint is connected with a pressure gauge through a pressure guiding pipe; a tee joint is arranged on a hydraulic oil pipe of the third position valve, which leads to a second oil cavity of the C4 hydraulic oil cylinder, and the tee joint is connected with a pressure gauge through a pressure guiding pipe; and a tee joint is arranged on a hydraulic oil pipe which opens a gas oil cavity and is communicated with the C6 hydraulic oil cylinder at the fourth position valve, and the tee joint is connected with a pressure gauge through a pressure guiding pipe.
In order to achieve the same purpose of the technical scheme, the invention also provides an exchange heating control method of the coke oven heating system, which comprises the following steps:
when the first working state is converted:
when the coke oven heating system judges that the heating system is switched, a coil on the left side of the electromagnetic directional valve is electrified, a hydraulic oil path is opened, hydraulic oil enters a right cavity of the C6 hydraulic oil cylinder, a piston of the C6 hydraulic oil cylinder is pushed to move leftwards, and coal gas of a first group of combustion chambers is closed;
when the C6 hydraulic oil cylinder closes the gas and is in place, the limit switch detects a C6 hydraulic oil cylinder closing in-place signal, and the coke oven heating system starts to purge and time the first group of combustion chambers after the gas is closed; meanwhile, the left coil of the electromagnetic directional valve is powered off, and the hydraulic oil way is disconnected; meanwhile, a piston rod flange of the C6 hydraulic oil cylinder presses down a collision block of the first position valve, the first position valve is in an open state, and an oil way is communicated;
after the purging time is over, the coil on the left side of the electromagnetic directional valve is electrified again, and the hydraulic oil way is opened; because the first position valve is in an open state, hydraulic oil enters a right cavity of the C4 hydraulic oil cylinder through the first position valve, and pushes a piston of the C4 hydraulic oil cylinder to move leftwards, so that waste gas of a first group of combustion chambers is reversed; at the moment, the piston of the C6 hydraulic oil cylinder is in place and cannot move; realizing the first working state conversion of coke oven gas heating;
when the limit switch detects that the piston of the C4 hydraulic oil cylinder moves to the right position leftwards, the coil on the left side of the electromagnetic directional valve is powered off, and the hydraulic oil way is disconnected; entering a pause heating time and timing; meanwhile, a piston rod flange of the C4 hydraulic oil cylinder presses down a collision block of the second position valve, the second position valve is in an open state, and an oil way is communicated;
after the heating time is suspended, the left coil of the electromagnetic directional valve is electrified again, the hydraulic oil path is opened, and as the first position valve and the second position valve are both in an open state, hydraulic oil enters the left cavity of the C7 hydraulic oil cylinder through the two position valves to push the piston of the C7 hydraulic oil cylinder to move rightwards; opening the coal gas, and heating the second group of combustion chambers; meanwhile, after the limit switch detects that the C7 hydraulic oil cylinder is opened in place, the coil on the left side of the electromagnetic directional valve is powered off, and the hydraulic oil way is closed;
ending the first working state conversion of the coke oven gas heating;
when the second working state is converted:
when the coke oven heating system judges that the heating system is switched, a coil on the right side of the electromagnetic directional valve is electrified, a hydraulic oil path is opened, hydraulic oil enters a right cavity of the C7 hydraulic oil cylinder, a piston of the C7 hydraulic oil cylinder is pushed to move leftwards, and gas in a second group of combustion chambers is closed;
when the C7 hydraulic oil cylinder is closed in place, the limit switch detects a C7 hydraulic oil cylinder closing in place signal, and the coke oven heating system starts to purge and time the second group of combustion chambers after the gas is closed; meanwhile, the coil on the right side of the electromagnetic directional valve is powered off, and the hydraulic oil way is disconnected; meanwhile, a piston rod flange of the C7 hydraulic oil cylinder presses down a collision block of the third position valve, the third position valve is in an open state, and an oil way is communicated;
after the purging time is over, the coil on the right side of the electromagnetic directional valve is electrified again, and the hydraulic oil way is opened; because the third position valve is in an open state, hydraulic oil enters a left cavity of the C4 hydraulic oil cylinder through the third position valve, and pushes a piston of the C4 hydraulic oil cylinder to move rightwards, so that waste gas of a second group of combustion chambers is reversed; at the moment, the piston of the C7 hydraulic oil cylinder is in place and cannot move; the second working state conversion of the coke oven gas heating is realized;
when the limit switch detects that the piston of the C4 hydraulic oil cylinder moves rightwards to a proper position, the coil on the right side of the electromagnetic directional valve is powered off, and the hydraulic oil way is disconnected; entering a pause heating time and timing; meanwhile, a piston rod flange of the C4 hydraulic oil cylinder presses down a collision block of the fourth position valve, the fourth position valve is in an open state, and an oil way of the fourth position valve is communicated;
after the heating time is suspended, the coil on the right side of the electromagnetic directional valve is electrified again, and the hydraulic oil way is opened; because the third position valve and the fourth position valve are both in an open state, hydraulic oil enters the left cavity of the C6 hydraulic oil cylinder through the two position valves, pushes the piston of the C6 hydraulic oil cylinder to move rightwards, opens coal gas and heats the first group of combustion chambers; meanwhile, after the limit switch detects that the C6 hydraulic oil cylinder is opened in place, the coil on the right side of the electromagnetic directional valve is powered off, and the hydraulic oil way is closed;
the second working state of the coke oven gas heating is switched to be finished;
according to the technical scheme, the hydraulic fault is analyzed and diagnosed by adopting the optimized safety chain and the added oil circuit pressure detection device, so that the major potential safety hazard of the heating system when the hydraulic system breaks down in the prior art is eliminated, the hydraulic fault of the coal gas heating system can be timely identified and safely stopped, the safety performance of the coke oven heating system is effectively improved, and the safety risk of the coke oven heating system is greatly reduced; and meanwhile, a fault code is sent out, so that a fault point can be conveniently and quickly found, the fault processing time is greatly shortened, and safety guarantee is provided for the stable operation of a coke oven of 7.63 m.
Drawings
Brief description of the figures and reference numerals in the figures:
FIG. 1 is a schematic control diagram of the red phase to green phase of gas heating according to the present invention;
FIG. 2 is a schematic control diagram of the green phase to red phase of the gas heating according to the present invention;
FIG. 3 is a logic diagram of the heat exchange of the present invention;
FIG. 4 is a diagram of the data processing and logic control of the present invention.
Labeled as:
1. the hydraulic control system comprises a piston rod flange, 2, a limit switch, 3, a hydraulic oil cylinder, 4, a limit switch, 5, a piston rod flange, 6, a first position valve, 7, a pressure gauge, 8, a pressure pipe, 9, a tee joint, 10, a limit switch, 11, a limit switch, 12, a piston rod flange, 13, a piston rod flange, 14, a second position valve, 15, a tee joint, 16, a pressure pipe, 17, a pressure gauge, 18, a hydraulic oil pipe, 19, a limit switch, 20, a limit switch, 21, a piston rod flange, 22, a piston rod flange, 23, a tee joint, 24, a pressure pipe, 25, a pressure gauge, 26, an electromagnetic reversing valve, 27, a tee joint, 28, a pressure pipe, 29, a pressure gauge, 30, a third valve, 31, a tee joint, 32, a pressure pipe, 33, a pressure gauge, 34, a hydraulic oil pipe, 35, a tee joint, 36, a pressure pipe, 37, a pressure.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The structure of the invention as shown in fig. 1 and fig. 2 is a coke oven heating system, which comprises a plurality of combustion chambers, and adopts double-linkage fire paths to alternately change direction for heating, namely the combustion chambers are divided into two groups and respectively have two working state transitions, namely: when the first working state is switched, the first group of combustion chambers feed gas, and the second group of combustion chambers discharge waste gas; on the contrary, when the second working state is switched, the second group of combustion chambers enters gas, and the first group of combustion chambers discharges waste gas;
specifically, a coke oven with 7.63m is provided with 70 carbonization chambers, gas enters a combustion chamber corresponding to the odd number, and waste gas discharged from the combustion chamber corresponding to the even number is defined as red phase heating; on the contrary, the gas is fed into the combustion chamber corresponding to the even number, and the exhaust gas from the combustion chamber corresponding to the odd number is defined as green phase heating. The conversion from red phase to green phase is that the odd number is heated and converted into the even number; the green phase is converted into the red phase, namely, the heating of an even number is converted into the heating of an odd number. Reference herein to the red and green phases is made to the above definitions.
The coke oven heating system comprises a hydraulic system, wherein the hydraulic system is provided with three hydraulic oil cylinders 3, namely a C6 hydraulic oil cylinder for controlling the first group of combustion chambers to open and close gas, a C7 hydraulic oil cylinder for controlling the second group of combustion chambers to open and close gas and a C4 hydraulic oil cylinder for controlling waste gas reversing.
In order to overcome the problems and defects of the prior art and achieve the purposes of finding and effectively preventing the misoperation of a hydraulic oil cylinder of a heating exchange system in time and completely eradicating major coal gas safety accidents, the invention adopts the technical scheme that:
as shown in figures 1 and 2, the coke oven heating system of the invention is respectively provided with limit switches at the movement limit positions at two ends of a piston rod of each hydraulic oil cylinder: respectively a limit switch 2, a limit switch 4, a limit switch 10, a limit switch 11, a limit switch 19 and a limit switch 20;
the two ends of the piston rod are respectively provided with a piston rod flange: respectively a piston rod flange 1, a piston rod flange 5, a piston rod flange 12, a piston rod flange 13, a piston rod flange 21 and a piston rod flange 22.
When the piston rod flange moves to the limit position, the piston rod flange triggers the corresponding limit switch; the limit switch obtains the information of the actual state of the movement of the piston of the hydraulic oil cylinder and sends the information to a control unit of the coke oven heating system.
The limit switch 2, the limit switch 4, the limit switch 10, the limit switch 11, the limit switch 19 and the limit switch 20 are respectively arranged at the opening and closing in-place positions of the C6 hydraulic oil cylinder, the C4 hydraulic oil cylinder and the C7 hydraulic oil cylinder so as to sense the positions of the piston rod flange 1, the piston rod flange 5, the piston rod flange 12, the piston rod flange 13, the piston rod flange 21 and the piston rod flange 22.
The invention adopts the combined signal limiting device to judge the unsafe state of the hydraulic oil cylinder, and triggers the heating stop signal in time to stop the gas heating.
The hydraulic system is provided with an electromagnetic directional valve 26, and when the electromagnetic directional valve 26 is in the first working state conversion, a hydraulic oil pipe 18 of an oil inlet path of the hydraulic system is communicated with a closed gas oil cavity of a C6 hydraulic oil cylinder; then the first position valve 6 is communicated with a first oil cavity of a C4 hydraulic oil cylinder; then is communicated with an opening gas oil cavity of a C7 hydraulic oil cylinder through a second position valve 14;
as shown in fig. 1, the electromagnetic directional valve 26 controls the on-off of the hydraulic oil pipe 18, the hydraulic oil pipe 18 supplies oil to the C6 hydraulic oil cylinder, the C4 hydraulic oil cylinder and the C7 hydraulic oil cylinder respectively, and the first position valve 6 and the second position valve 14 on the oil path are used for realizing the sequential actions of the C6 hydraulic oil cylinder, the C4 hydraulic oil cylinder and the C7 hydraulic oil cylinder, so as to form the linkage among the hydraulic oil cylinders.
When a piston rod flange of the C6 hydraulic oil cylinder triggers a limit switch for closing gas, the first position valve 6 is pressed down at the same time to conduct an oil way; after the oil is fed into the first oil cavity of the C4 hydraulic oil cylinder to the right position, when the piston rod flange triggers the corresponding limit switch, the second position valve 14 is pressed down to conduct the oil circuit.
A tee joint 15 is arranged on a hydraulic oil pipe which leads to the C6 hydraulic oil cylinder and closes a gas oil cavity of the electromagnetic directional valve 26, and is connected with a pressure gauge 17 through a pressure guiding pipe 16; a tee joint 9 is arranged on a hydraulic oil pipe of the first position valve 6, which is communicated with a first oil cavity of the C4 hydraulic oil cylinder, and is connected with a pressure gauge 7 through a pressure guiding pipe 8; and a tee joint 23 is arranged on a hydraulic oil pipe of the second position valve 14, which leads to the C7 hydraulic oil cylinder and opens a gas oil chamber, and is connected with a pressure gauge 25 through a pressure leading pipe 24.
The hydraulic oil pipe 18 is respectively provided with 3 pressure gauges:
the pressure gauge 17 is arranged on a pipeline between the electromagnetic directional valve 26 and the first position valve 6, is connected to the pressure leading pipe 16 through a tee 15 on the pipeline and then is connected with the pressure gauge 17;
the pressure gauge 7 is arranged on a pipeline between the first position valve 6 and the second position valve 14, is connected to the pressure leading pipe 8 through a tee joint 9 on the pipeline, and is connected with the pressure gauge 7;
the pressure gauge 25 is arranged on a pipeline between the second position valve 14 and the inlet of the C7 hydraulic oil cylinder, is connected to a pressure leading pipe 24 through a tee 23 on the pipeline and is connected with the pressure gauge 25.
As shown in fig. 2, the electromagnetic directional valve 26 also controls the on-off of the hydraulic oil pipe 34, the hydraulic oil pipe 34 supplies oil to the C7 hydraulic oil cylinder, the C4 hydraulic oil cylinder and the C6 hydraulic oil cylinder, and the third position valve 30 and the fourth position valve 38 on the oil passage realize the sequential actions of the C6 hydraulic oil cylinder, the C4 hydraulic oil cylinder and the C7 hydraulic oil cylinder to form the linkage among the hydraulic oil cylinders.
When the electromagnetic directional valve 26 is in the second working state conversion, the hydraulic oil pipe 34 of the oil inlet path of the hydraulic system is communicated with the gas-oil closing cavity of the C7 hydraulic oil cylinder; then is communicated with a second oil cavity of the C4 hydraulic oil cylinder through a third position valve 30; then is communicated with an opening gas oil cavity of a C6 hydraulic oil cylinder through a fourth position valve 38;
when a piston rod flange of the C7 hydraulic oil cylinder triggers a limit switch for closing gas, the third position valve 30 is pressed down at the same time to conduct the oil path; after the oil is fed into the first oil cavity of the C4 hydraulic oil cylinder to the right position, when the piston rod flange triggers the corresponding limit switch, the fourth position valve 38 is pressed down to conduct the oil circuit.
A tee joint 31 is arranged on a hydraulic oil pipe which leads to the C7 hydraulic oil cylinder and closes a gas oil cavity of the electromagnetic directional valve 26, and is connected with a pressure gauge 33 through a pressure guiding pipe 32; a tee joint 35 is arranged on a hydraulic oil pipe of the third position valve 30, which leads to a second oil cavity of the C4 hydraulic oil cylinder, and is connected with a pressure gauge 37 through a pressure guiding pipe 36; a tee joint 27 is arranged on a hydraulic oil pipe of the fourth position valve 14, which leads to the C6 hydraulic oil cylinder and opens a gas oil chamber, and is connected with a pressure gauge 29 through a pressure guiding pipe 28.
The hydraulic oil pipe 34 is also respectively provided with 3 pressure gauges:
the pressure gauge 33 is arranged on a pipeline between the electromagnetic directional valve 26 and the third position valve 30, is connected to a pressure guiding pipe 32 through a tee joint 31 on the pipeline and then is connected with the pressure gauge 33;
the pressure gauge 37 is arranged on a pipeline between the third position valve 30 and the fourth position valve 38, is connected to the pressure guiding pipe 36 through a tee 35 on the pipeline and then is connected with the pressure gauge 37;
the pressure gauge 29 is arranged on a pipeline between the fourth position valve 38 and the inlet of the C6 hydraulic oil cylinder, and is connected to the pressure guide pipe 28 through a tee joint 27 on the pipeline and then connected with the pressure gauge 40.
According to the invention, hydraulic pressure detection points are added, the actual working conditions of the elements such as a failed hydraulic cylinder or a position valve are rapidly judged according to the pressure detection results, and the failure diagnosis mode is optimized, so that the failure processing time is greatly shortened, and the heating safety performance of the coke oven gas is effectively improved.
When the hydraulic system has a fault, a judgment program for judging the simultaneous action of the two oil cylinders or the advance action of the oil cylinders is added, and the possible situations are judged according to the following situations:
1. when the first position valve 6 and the second position valve 14 cannot be effectively turned off (normally opened) at the same time or the third position valve 30 and the fourth position valve 38 cannot be effectively turned off (normally opened) at the same time and the C6 hydraulic oil cylinder and the C7 hydraulic oil cylinder are not closed simultaneously for limitation, the C6 hydraulic oil cylinder and the C7 hydraulic oil cylinder are judged to act simultaneously, a heating stopping signal is triggered, the gas hydraulic cylinder is turned off, and safety is ensured.
2. When the first position valve 6 or the fourth position valve 38 cannot be effectively turned off (normally opened), and the C6 hydraulic oil cylinder is not in the closing limit and the C4 hydraulic oil cylinder is not in the red phase limit and the green phase limit, the C6 hydraulic oil cylinder and the C4 hydraulic oil cylinder are judged to simultaneously act, a heating stop signal is triggered, the gas hydraulic cylinder is turned off, and safety is ensured.
3. When the second position valve 14 or the third position valve 30 cannot be effectively turned off (normally opened), and the C7 hydraulic oil cylinder is not at the closing limit and the C4 hydraulic oil cylinder is not at the red phase limit and the green phase limit, the C7 hydraulic oil cylinder and the C4 hydraulic oil cylinder are judged to simultaneously act, a heating stop signal is triggered, the gas hydraulic cylinder is turned off, and safety is ensured.
4. When the fourth position valve 38 cannot be effectively turned off (normally opened), and the C6 hydraulic oil cylinder is not at the closing limit and the C4 hydraulic oil cylinder is not at the red phase limit, the C6 hydraulic oil cylinder is judged to act before the C4 hydraulic oil cylinder, a heating stop signal is triggered, the gas hydraulic cylinder is turned off, and safety is ensured.
5. When the second position valve 14 cannot be effectively closed (normally opened), and the C7 hydraulic oil cylinder is not in the closing limit and the C4 hydraulic oil cylinder is not in the green phase limit, the C7 hydraulic oil cylinder is judged to act before the C4 hydraulic oil cylinder, a heating stop signal is triggered, the gas hydraulic cylinder is closed, and safety is ensured.
And comprehensively analyzing the pressure value change condition of each oil way section to judge the position valve with fault.
In order to achieve the same purpose of the technical scheme, the invention also provides an exchange heating control method of the coke oven heating system, which comprises the following steps:
1. in the first operating state transition (i.e., the gas heating red phase changes to green phase as shown in fig. 1):
when the coke oven heating system judges that the heating system is switched, a coil on the left side of the electromagnetic directional valve 26 is electrified, a hydraulic oil path is opened, hydraulic oil enters a right cavity of the C6 hydraulic oil cylinder, a piston of the C6 hydraulic oil cylinder is pushed to move leftwards, and gas in a first group of combustion chambers is closed;
when the C6 hydraulic oil cylinder closes the gas and is in place, the limit switch 2 detects a C6 hydraulic oil cylinder closing in-place signal, and the coke oven heating system starts to purge and time the first group of combustion chambers after the gas is closed; meanwhile, the coil on the left side of the electromagnetic directional valve 26 is powered off, the electromagnetic directional valve 26 is located at the middle position, and the hydraulic oil path is disconnected; meanwhile, a piston rod flange 5 of the C6 hydraulic oil cylinder presses down a collision block of the first position valve 6, the first position valve 6 is in an open state, and an oil way is communicated;
after the purging time is over, the coil on the left side of the electromagnetic directional valve 26 is electrified again, and the hydraulic oil way is opened; because the first position valve 6 is in an open state, hydraulic oil enters a right cavity of the C4 hydraulic oil cylinder through the first position valve 6, and pushes a piston of the C4 hydraulic oil cylinder to move leftwards, so that waste gas of a first group of combustion chambers is reversed; at the moment, the piston of the C6 hydraulic oil cylinder is in place and cannot move; the first working state conversion of the coke oven gas heating is realized, namely the coke oven gas heating is switched from the red phase to the green phase;
when the limit switch 4 detects that the piston of the C4 hydraulic oil cylinder moves to the right (namely reaches the green phase position) leftwards, the coil on the left side of the electromagnetic directional valve 26 is powered off, the electromagnetic directional valve 26 is located at the middle position, and the hydraulic oil way is disconnected; entering a pause heating time and timing; meanwhile, a piston rod flange 13 of the C4 hydraulic oil cylinder presses down a collision block of the second position valve 14, the second position valve 14 is in an open state, and an oil way is communicated;
after the heating time is suspended, the coil on the left side of the electromagnetic directional valve 26 is electrified again, the hydraulic oil path is opened, and as the first position valve 6 and the second position valve 14 are both in an open state, hydraulic oil enters the left cavity of the C7 hydraulic oil cylinder through the two position valves to push the piston of the C7 hydraulic oil cylinder to move rightwards; opening the coal gas, and heating the second group of combustion chambers; namely, the C6 hydraulic oil cylinder opens the red-phase gas heating; meanwhile, after the limit switch 19 detects that the C7 hydraulic oil cylinder is opened in place, the coil on the left side of the electromagnetic directional valve 26 is powered off, the electromagnetic directional valve 26 is located in the middle position, and the hydraulic oil way is closed;
at this point, the first operating state transition of the coke oven gas heating is completed (i.e., the coke oven gas heating is completed by the red phase transition to the green phase).
2. In the second operating mode (i.e. the gas-heated green phase changes to the red phase as shown in fig. 2):
when the coke oven heating system judges that the heating system is switched, a coil on the right side of the electromagnetic directional valve 26 is electrified, a hydraulic oil path is opened, hydraulic oil enters a right cavity of the C7 hydraulic oil cylinder, a piston of the C7 hydraulic oil cylinder is pushed to move leftwards, and gas of a second group of combustion chambers is closed; namely C7 turns off green-phase gas;
when the C7 hydraulic oil cylinder is closed in place, the limit switch 20 detects a C7 hydraulic oil cylinder closing in place signal, and the coke oven heating system starts to purge and time the second group of combustion chambers after the gas is closed; meanwhile, the coil on the right side of the electromagnetic directional valve 26 is powered off, the electromagnetic directional valve 26 is located in the middle position, and the hydraulic oil path is disconnected; meanwhile, the piston rod flange 22 of the C7 hydraulic cylinder presses down the touch block of the third position valve 30, the third position valve 30 is in an open state, and the oil path is conducted;
after the purging time is over, the coil on the right side of the electromagnetic directional valve 26 is electrified again, and the hydraulic oil way is opened; because the third position valve 30 is in an open state, hydraulic oil enters a left cavity of the C4 hydraulic oil cylinder through the third position valve 30, and pushes a piston of the C4 hydraulic oil cylinder to move rightwards, so that waste gas in the second group of combustion chambers is reversed; at the moment, the piston of the C7 hydraulic oil cylinder is in place and cannot move; the second working state conversion of the coke oven gas heating is realized, namely the coke oven gas heating is switched from the green phase to the red phase;
when the limit switch detects that the piston of the C4 hydraulic oil cylinder moves rightwards to a proper position (reaches a red phase position), the coil on the right side of the electromagnetic directional valve 26 is powered off, the electromagnetic directional valve 26 is located in the middle position, and a hydraulic oil way is disconnected; entering a pause heating time and timing; meanwhile, the piston rod flange 12 of the C4 hydraulic cylinder presses down the bump block of the fourth position valve 38, the fourth position valve 38 is in an open state, and the oil path is communicated;
after the heating time is suspended, the coil on the right side of the electromagnetic directional valve 26 is electrified again, and the hydraulic oil way is opened; because the third position valve 30 and the fourth position valve 38 are both in an open state, hydraulic oil enters the left cavity of the C6 hydraulic oil cylinder through the two position valves, pushes the piston of the C6 hydraulic oil cylinder to move rightwards, opens coal gas and heats the first group of combustion chambers; namely, the green-phase gas is opened by the C6 hydraulic oil cylinder; meanwhile, after the limit switch 19 detects that the C6 hydraulic oil cylinder is opened in place, the coil on the right side of the electromagnetic directional valve 26 is powered off, the electromagnetic directional valve 26 is located in the middle position, and the hydraulic oil way is closed;
at this point, the second operating state transition of the coke oven gas heating is completed (i.e., the coke oven gas heating is completed by the green phase transition to the red phase).
The specific data processing and logic control process is shown in fig. 3 and 4:
1. the PLC system is self-checked normally, and the states of all systems on the detection site are normal;
2. the system identifies that the gas heating system is in red phase heating or green phase heating, and enters a heating state; when the reversing condition of the heating system is met, the heating system starts to perform gas reversing operation; closing the gas hydraulic cylinder which is heating;
the closing process is not abnormal, the carbon removal purging operation is carried out, after the carbon removal purging operation is finished, the waste gas of the C4 hydraulic oil cylinder is reversed, and the furnace temperature is adjusted within the heating pause time if the reversing process is not abnormal; after the heating is suspended, the gas cylinder heated by the other phase is opened, and the related auxiliary system enters an automatic adjusting state; the exchange is completed;
3. when the oil cylinder is abnormal in the action process, the heating is triggered to stop, the safety oil way is opened, and all the gas oil cylinders are closed, so that the safety of the coke oven and personnel is ensured.
The process is described as follows:
each remote module of the coke oven heating system PLC acquires state information from the field sensor and transmits the state information to the main PLC. The main PLC receives the state information of the site, performs related logic processing, outputs a corresponding signal to the output module, and the output module controls the on-off of the solenoid valve coil so as to control the on-off of the oil way of the oil cylinder, thereby controlling the action of the oil cylinder. When other systems are abnormal, the gas stops heating.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (5)
1. A coke oven heating system comprises a plurality of combustion chambers, wherein double-linkage fire paths are adopted for alternately reversing and heating, namely the combustion chambers are divided into two groups and are respectively switched into two working states, namely: when the first working state is switched, the first group of combustion chambers feed gas, and the second group of combustion chambers discharge waste gas; on the contrary, when the second working state is switched, the second group of combustion chambers enters gas, and the first group of combustion chambers discharges waste gas;
the coke oven heating system comprises a hydraulic system, wherein the hydraulic system is provided with three hydraulic oil cylinders (3), namely a C6 hydraulic oil cylinder for controlling the first group of combustion chambers to open and close gas, a C7 hydraulic oil cylinder for controlling the second group of combustion chambers to open and close gas and a C4 hydraulic oil cylinder for controlling waste gas reversing;
the method is characterized in that:
limit switches (2, 4, 10, 11, 19 and 20) are respectively arranged at the movement limit positions at two ends of a piston rod of each hydraulic oil cylinder; piston rod flanges (1, 5, 12, 13, 21 and 22) are respectively arranged at two ends of the piston rod; when the piston rod flange moves to the limit position, the piston rod flange triggers the corresponding limit switch; the limit switch obtains the information of the actual state of the movement of the piston of the hydraulic oil cylinder and sends the information to a control unit of the coke oven heating system;
the hydraulic system is provided with an electromagnetic directional valve (26), and when the electromagnetic directional valve (26) is in a first working state conversion, a hydraulic oil pipe (18) of an oil inlet path of the hydraulic system is communicated with a gas-closed oil chamber of a C6 hydraulic oil cylinder;
then the first oil cavity of the C4 hydraulic oil cylinder is communicated with the first position valve (6); then is communicated with an opening gas oil cavity of a C7 hydraulic oil cylinder through a second position valve (14);
when a piston rod flange of the C6 hydraulic oil cylinder triggers a limit switch for closing gas, the first position valve (6) is pressed down at the same time to conduct an oil way; after the oil is fed into the first oil cavity of the C4 hydraulic oil cylinder to the right position, when the piston rod flange triggers the corresponding limit switch, the second position valve (14) is pressed down to conduct the oil circuit.
2. The coke oven heating system of claim 1, wherein: a tee joint (15) is arranged on a hydraulic oil pipe which is communicated with a C6 hydraulic oil cylinder and used for closing a gas oil cavity of the electromagnetic directional valve (26), and is connected with a pressure gauge (17) through a pressure guiding pipe (16); a tee joint (9) is arranged on a hydraulic oil pipe of the first position valve (6) which is communicated with a first oil cavity of the C4 hydraulic oil cylinder, and is connected with a pressure gauge (7) through a pressure guiding pipe (8); a tee joint (23) is arranged on a hydraulic oil pipe which opens a gas oil chamber and is communicated with a C7 hydraulic oil cylinder by a second position valve (14), and the tee joint is connected with a pressure gauge (25) by a pressure guiding pipe (24).
3. A coke oven heating system comprises a plurality of combustion chambers, wherein double-linkage fire paths are adopted for alternately reversing and heating, namely the combustion chambers are divided into two groups and are respectively switched into two working states, namely: when the first working state is switched, the first group of combustion chambers feed gas, and the second group of combustion chambers discharge waste gas; on the contrary, when the second working state is switched, the second group of combustion chambers enters gas, and the first group of combustion chambers discharges waste gas;
the coke oven heating system comprises a hydraulic system, wherein the hydraulic system is provided with three hydraulic oil cylinders (3), namely a C6 hydraulic oil cylinder for controlling the first group of combustion chambers to open and close gas, a C7 hydraulic oil cylinder for controlling the second group of combustion chambers to open and close gas and a C4 hydraulic oil cylinder for controlling waste gas reversing;
the method is characterized in that:
limit switches (2, 4, 10, 11, 19 and 20) are respectively arranged at the movement limit positions at two ends of a piston rod of each hydraulic oil cylinder; piston rod flanges (1, 5, 12, 13, 21 and 22) are respectively arranged at two ends of the piston rod; when the piston rod flange moves to the limit position, the piston rod flange triggers the corresponding limit switch; the limit switch obtains the information of the actual state of the movement of the piston of the hydraulic oil cylinder and sends the information to a control unit of the coke oven heating system;
the hydraulic system is provided with an electromagnetic directional valve (26), and when the electromagnetic directional valve (26) is in a second working state conversion, a hydraulic oil pipe (34) of an oil inlet path of the hydraulic system is communicated with a gas-closed oil chamber of a C7 hydraulic oil cylinder;
then the oil is communicated with a second oil cavity of the C4 hydraulic oil cylinder through a third position valve (30); then is communicated with an opening gas oil cavity of a C6 hydraulic oil cylinder through a fourth position valve (38);
when a piston rod flange of the C7 hydraulic oil cylinder triggers a limit switch for closing gas, the third position valve (30) is pressed down at the same time to conduct the oil path; after the oil is fed into the first oil cavity of the C4 hydraulic oil cylinder to the right position, when the piston rod flange triggers the corresponding limit switch, the fourth position valve (38) is pressed down simultaneously to conduct the oil circuit.
4. The coke oven heating system of claim 3, wherein: a tee joint (31) is arranged on a hydraulic oil pipe which is communicated with a C7 hydraulic oil cylinder and used for closing a gas oil cavity of the electromagnetic directional valve (26), and is connected with a pressure gauge (33) through a pressure guiding pipe (32); a tee joint (35) is arranged on a hydraulic oil pipe of the third position valve (30) which leads to a second oil cavity of the C4 hydraulic oil cylinder, and the tee joint is connected with a pressure gauge (37) through a pressure guiding pipe (36); a tee joint (27) is arranged on a hydraulic oil pipe which opens a gas oil chamber and is communicated with the C6 hydraulic oil cylinder at the fourth position valve, and the tee joint is connected with a pressure gauge (29) through a pressure guiding pipe (28).
5. The exchange heating control method of a coke oven heating system of any one of claims 1 to 4, characterized in that:
when the first working state is converted:
when the coke oven heating system judges that the heating system is switched, a coil on the left side of the electromagnetic directional valve (26) is electrified, a hydraulic oil path is opened, hydraulic oil enters a right cavity of the C6 hydraulic oil cylinder, a piston of the C6 hydraulic oil cylinder is pushed to move leftwards, and gas in a first group of combustion chambers is closed;
when the C6 hydraulic oil cylinder closes the gas to be in place, the limit switch (2) detects a C6 hydraulic oil cylinder closing in-place signal, and the coke oven heating system starts to purge and time the first group of combustion chambers after the gas is closed; meanwhile, a coil on the left side of the electromagnetic directional valve (26) is powered off, and a hydraulic oil way is disconnected; meanwhile, a piston rod flange (5) of the C6 hydraulic oil cylinder presses down a collision block of the first position valve (6), the first position valve (6) is in an open state, and an oil way is communicated;
after the purging time is over, the coil on the left side of the electromagnetic directional valve (26) is electrified again, and the hydraulic oil way is opened; because the first position valve (6) is in an open state, hydraulic oil enters a right cavity of the C4 hydraulic oil cylinder through the first position valve (6) to push a piston of the C4 hydraulic oil cylinder to move leftwards, and waste gas in a first group of combustion chambers is reversed; at the moment, the piston of the C6 hydraulic oil cylinder is in place and cannot move; realizing the first working state conversion of coke oven gas heating;
when the limit switch (4) detects that the piston of the C4 hydraulic oil cylinder moves to the right position leftwards, the coil on the left side of the electromagnetic directional valve (26) is powered off, and the hydraulic oil way is disconnected; entering a pause heating time and timing; meanwhile, a piston rod flange (13) of the C4 hydraulic oil cylinder presses down a collision block of a second position valve (14), the second position valve (14) is in an open state, and an oil way is communicated;
after the heating time is suspended, the coil on the left side of the electromagnetic directional valve (26) is electrified again, the hydraulic oil path is opened, and as the first position valve (6) and the second position valve (14) are both in an open state, hydraulic oil enters the left cavity of the C7 hydraulic oil cylinder through the two position valves to push the piston of the C7 hydraulic oil cylinder to move rightwards; opening the coal gas, and heating the second group of combustion chambers; meanwhile, after the limit switch (19) detects that the C7 hydraulic oil cylinder is opened in place, the coil on the left side of the electromagnetic directional valve (26) is powered off, and the hydraulic oil way is closed;
ending the first working state conversion of the coke oven gas heating;
when the second working state is converted:
when the coke oven heating system judges that the heating system is switched, a coil on the right side of the electromagnetic directional valve (26) is electrified, a hydraulic oil path is opened, hydraulic oil enters a right cavity of the C7 hydraulic oil cylinder, a piston of the C7 hydraulic oil cylinder is pushed to move leftwards, and gas of a second group of combustion chambers is closed;
when the C7 hydraulic oil cylinder is closed in place, the limit switch (20) detects a C7 hydraulic oil cylinder closing in place signal, and the coke oven heating system starts to purge and time the second group of combustion chambers after gas is closed; meanwhile, the coil on the right side of the electromagnetic directional valve (26) is powered off, and the hydraulic oil way is disconnected; meanwhile, a piston rod flange (22) of the C7 hydraulic oil cylinder presses down a collision block of the third position valve (30), the third position valve (30) is in an open state, and an oil way is communicated;
after the purging time is over, the coil on the right side of the electromagnetic directional valve (26) is electrified again, and the hydraulic oil way is opened; because the third position valve (30) is in an open state, hydraulic oil enters a left cavity of the C4 hydraulic oil cylinder through the third position valve (30) and pushes a piston of the C4 hydraulic oil cylinder to move rightwards, and waste gas of a second group of combustion chambers is reversed; at the moment, the piston of the C7 hydraulic oil cylinder is in place and cannot move; the second working state conversion of the coke oven gas heating is realized;
when the limit switch (10) detects that the piston of the C4 hydraulic oil cylinder moves rightwards to a proper position, the coil on the right side of the electromagnetic directional valve (26) is powered off, and the hydraulic oil way is disconnected; entering a pause heating time and timing; meanwhile, a piston rod flange (12) of the C4 hydraulic oil cylinder presses down a collision block of the fourth position valve (38), the fourth position valve (38) is in an open state, and an oil path of the fourth position valve is communicated;
after the heating time is suspended, the coil on the right side of the electromagnetic directional valve (26) is electrified again, and the hydraulic oil way is opened; because the third position valve (30) and the fourth position valve (38) are both in an open state, hydraulic oil enters a left cavity of the C6 hydraulic oil cylinder through the two position valves, a piston of the C6 hydraulic oil cylinder is pushed to move rightwards, coal gas is opened, and the first group of combustion chambers are heated; meanwhile, after the limit switch (19) detects that the C6 hydraulic oil cylinder is opened in place, the coil on the right side of the electromagnetic directional valve (26) is powered off, and the hydraulic oil way is closed;
and ending the second working state conversion of the coke oven gas heating.
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| CN202011106797.5A CN112251243B (en) | 2020-10-16 | 2020-10-16 | Coke oven heating system and exchange heating control method thereof |
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