CN114106857A - System for improving desulfurization and denitrification safety of coke oven and control method - Google Patents
System for improving desulfurization and denitrification safety of coke oven and control method Download PDFInfo
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- CN114106857A CN114106857A CN202111444316.6A CN202111444316A CN114106857A CN 114106857 A CN114106857 A CN 114106857A CN 202111444316 A CN202111444316 A CN 202111444316A CN 114106857 A CN114106857 A CN 114106857A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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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
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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
- C10B33/00—Discharging devices; Coke guides
- C10B33/003—Arrangements for pollution-free discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a system for improving desulfurization and denitrification safety of a coke oven, which comprises a coke oven heating mechanism, a desulfurization and denitrification mechanism, a flue suction detection mechanism, an underground flue and a coke oven chimney, wherein the coke oven heating mechanism is communicated with the coke oven chimney through the underground flue, one side of the desulfurization and denitrification mechanism is communicated with the underground flue through a pipeline, the other side of the desulfurization and denitrification mechanism is communicated with the coke oven chimney through a pipeline, and the flue suction detection mechanism is arranged on the underground flue. The flue suction detection mechanism is used for detecting the suction of a flue in real time, and can stop the coke oven heating system when the suction of the desulfurization and denitrification system is insufficient, automatically close the heating gas cock, cut off the gas and ensure the safety of the system. The safety protection device is used for improving the safety of a desulfurization and denitration system and a coke oven heating system, minimizing the greater safety risk of the desulfurization and denitration system and the coke oven heating system, and avoiding the occurrence of malignant accidents. The invention also discloses a control method for improving the desulfurization and denitrification safety of the coke oven.
Description
Technical Field
The invention belongs to the technical field of coal chemical industry, and particularly relates to a system for improving the desulfurization and denitrification safety of a coke oven and a control method.
Background
With the implementation of 2012 atmospheric emission standards in the coking industry, the coke oven chimney is added with a desulfurization and denitration system, and the realization of ultralow emission of coke oven flue gas becomes a necessary choice. Because the discharge of the coke oven flue gas and the desulfurization and denitrification system are closely combined into a vertical process, the original simple control of the coke oven flue gas and a chimney cannot meet the requirement of safe production. The desulfurization and denitrification system and the coke oven heating system are systematically and safely combed, various unsafe states of the desulfurization and denitrification system are arranged, and the safety of the desulfurization and denitrification system and the coke oven heating system is ensured through a reasonable control system strategy.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system and a control method for improving the desulfurization and denitrification safety of a coke oven, which are used for improving the safety of a desulfurization and denitrification system and a coke oven heating system, minimizing the greater safety risk of the desulfurization and denitrification system and the coke oven heating system and avoiding the occurrence of malignant accidents.
In order to achieve the purpose, the technical scheme of the invention is as follows: a system for improving the desulfurization and denitrification safety of a coke oven comprises a coke oven heating mechanism, a desulfurization and denitrification mechanism, a flue suction detection mechanism, an underground flue and a coke oven chimney, wherein the coke oven heating mechanism is communicated with the coke oven chimney through the underground flue, one side of the desulfurization and denitrification mechanism is communicated with the underground flue through a pipeline, the other side of the desulfurization and denitrification mechanism is communicated with the coke oven chimney through a pipeline, and the flue suction detection mechanism is installed on the underground flue.
Furthermore, flue suction detection mechanism includes pressure transmitter I, pressure transmitter II and pressure transmitter III, and pressure transmitter I, pressure transmitter II, III parallel connection of pressure transmitter are on the underground flue, and pressure transmitter I, pressure transmitter II and pressure transmitter III are connected with coke oven heating mechanism electricity through the PLC controller.
Furthermore, the coke oven heating mechanism comprises a coke oven, a coke oven heating gas cock, a cock brace and a power assembly for driving the cock brace to move, wherein the gas is communicated with the coke oven through a pipeline to supply fuel to the coke oven, the coke oven heating gas cock is arranged on a gas conveying pipeline and used for controlling the opening and closing of the coke oven heating gas, the cock brace is connected with the coke oven heating gas cock through a connecting rod, and the cock brace controls the rotation of the coke oven heating gas cock.
Furthermore, the power assembly comprises a hydraulic cylinder, an unloading valve, an energy accumulator and an oil tank, the hydraulic cylinder is used for driving the gas cock to move, the cock brace is connected with a telescopic rod of the hydraulic cylinder, the energy accumulator is communicated with the hydraulic cylinder through an oil way, the unloading valve is arranged on the oil way and is positioned between the energy accumulator and the hydraulic cylinder, and the unloading valve is electrically connected with the PLC.
Furthermore, a gravity gate valve is arranged in the coke oven chimney and comprises a winch, a gate and a DCS controller, the gate is arranged at the intersection of the underground flue and the coke oven chimney in a sliding mode, the upper end of the gate is connected with the winch through a rope and a pulley, and the positive and negative rotation of the winch drives the gate to move up and down.
Further, the gravity gate valve still includes counter weight I, counter weight II and solenoid valve, and counter weight I and counter weight II set up in the both sides of flashboard through rope and pulley symmetry, and counter weight I uses with the hoist cooperation, lies in the below of counter weight II on the solenoid valve installing support, and the solenoid valve is connected with DCS controller electricity, and when the solenoid valve got the electricity, the solenoid valve head stretched out, and the solenoid valve holds counter weight II, and when the solenoid valve lost the electricity, the solenoid valve withdrawal stretched out, and solenoid valve and II contactless of counter weight, counter weight II and counter weight I fall together and drive the flashboard and rise.
Further, SOx/NOx control mechanism includes SOx/NOx control flue gas inlet pipeline, adsorption tower, SOx/NOx control exhanst gas outlet pipeline, and the entry of adsorption tower passes through SOx/NOx control flue gas inlet pipeline and underground flue intercommunication, and the export of adsorption tower passes through SOx/NOx control exhanst gas outlet pipeline and chimney intercommunication, is equipped with the flue gas inlet valve on the SOx/NOx control flue gas inlet pipeline, is equipped with the flue gas outlet valve on the SOx/NOx control exhanst gas outlet pipeline.
Further, the system for improving the desulfurization and denitrification safety of the coke oven as claimed in claim, wherein: the entry of adsorption tower is equipped with three adsorption tower inlet valve, and three adsorption tower inlet valve parallel connection is on SOx/NOx control flue gas inlet pipe, and the export of adsorption tower is equipped with three adsorption tower outlet valve, and three adsorption tower outlet valve parallel connection still is equipped with booster fan on the SOx/NOx control flue gas outlet pipeline on SOx/NOx control flue gas outlet pipeline, and booster fan is located between adsorption tower outlet valve and the flue gas outlet valve.
Based on the system for improving the desulfurization and denitrification safety of the coke oven, the invention also relates to a control method for improving the desulfurization and denitrification safety of the coke oven, which comprises the following steps:
a. when the desulfurization and denitrification mechanism does not work, the gravity gate valve is opened, and flue gas generated by heating the coal gas in the coke oven heating system directly enters a chimney through an underground flue and is discharged into the atmosphere;
b. when the desulfurization and denitrification mechanism works, the gravity gate valve is closed to separate the flue gas in the underground flue from the chimney, and the flue gas in the underground flue enters the desulfurization and denitrification mechanism, passes through the desulfurization and denitrification mechanism, then reaches the chimney and is discharged into the atmosphere;
c. the suction of the underground flue is detected in real time to control the heating of the coke oven, when the suction of the desulfurization and denitrification system is insufficient, the heating mechanism of the coke oven can be stopped, the heating gas cock is automatically closed, and the gas is cut off to ensure the safety of the system;
d. and detecting the working conditions of the flue gas inlet valve, the adsorption tower outlet valve, the booster fan and the flue gas outlet valve in real time, and controlling the actions of the coke oven heating mechanism and the gravity gate valve.
Further, the specific operation of c is as follows: comparing the measured values of the pressure transmitter I, the pressure transmitter II and the pressure transmitter III in pairs in real time, selecting two measured values with the minimum difference, taking an absolute value of the two selected measured values, and finally selecting the minimum absolute value as an actual optimal value; or when any measuring point in the pressure transmitter I, the pressure transmitter II and the pressure transmitter III has an overrange, or any line of the pressure transmitter I, the pressure transmitter II and the pressure transmitter III has a fault, a signal is transmitted to the PLC controller, the PLC controller controls the action of the unloading valve, the coke oven heating system is interlocked, and heating is stopped;
the specific operation of d is as follows: when any one of the conditions of the stop of the booster fan, the closing of the flue gas inlet valve, the closing of two inlet valves of the adsorption tower, the closing of two outlet valves of the adsorption tower and the closing of the flue gas outlet valve occurs, or the large-area power failure of the system occurs, the electromagnetic valve in the gravity gate valve is de-energized, and the gravity gate valve is automatically opened under the action of the counterweight II and the counterweight I; meanwhile, a signal is transmitted to the PLC controller, the PLC controller controls the unloading valve to act, and the coke oven heating system is interlocked to stop heating.
The technical scheme adopted by the invention has the advantages that:
1. the invention adopts two-degree safety redundant control, the coke oven heating mechanism and the desulfurization and denitrification mechanism can achieve intrinsic safety, and the safety of the system can be reliably ensured under the extreme condition of signal failure or system power failure of a control system.
2. The invention sends equipment signals related to various unsafe states to a desulfurization and denitrification control system, carries out logic processing and outputs signals to a coke oven heating system, and the coke oven heating system receives abnormal state signals of the desulfurization and denitrification system, triggers related heating stop, cuts off heating coal gas and ensures the safety of the system; meanwhile, the coke oven heating mechanism needs to detect the smoke suction force, and when the smoke suction force is insufficient, the related heating stop is triggered, the heating coal gas is cut off, and the system safety is ensured; in order to ensure that the coke oven heating system gas cylinder closes the hydraulic oil circuit and the hydraulic energy accumulator is controlled by the electromagnetic unloading valve when the system is powered off, the pressure of the energy accumulator automatically closes the heating gas when the system is powered off, and the safety of the system is ensured.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic view of an overall system of the present invention;
FIG. 2 is a schematic view of a power assembly of a heating mechanism of the coke oven according to the present invention;
FIG. 3 is a schematic view of a gravity gate valve according to the present invention;
FIG. 4 is a schematic diagram of the control logic of the present invention.
The labels in the above figures are respectively: 1. a coke oven; 2. a coke oven heating gas cock; 3. an underground flue; 4. a coke oven chimney; 5. a gravity gate valve; 6. a desulfurization and denitrification flue gas inlet pipeline; 7. a flue gas inlet valve; 8. an adsorption column inlet valve; 9. an adsorption column outlet valve; 10. a booster fan; 11. a flue gas outlet valve; 12. a pressure transmitter I; 13. a pressure transmitter II; 14. an adsorption tower; 15. a pressure transmitter III; 16. a cock brace; 17. a desulfurization and denitrification flue gas outlet pipeline; 20. a hydraulic cylinder; 23. an unloading valve; 26. an oil tank; 28. an accumulator; 51. hoisting; 52. a shutter plate; 53. a counterweight I; 54. balancing weight II; 55. an electromagnetic valve.
Detailed Description
In the present invention, it is to be understood that the term "length"; "Width"; "Up"; "Down"; "front"; "Back"; "left"; "Right"; "vertical"; "horizontal"; "Top"; "bottom" "inner"; "outer"; "clockwise"; "counterclockwise"; "axial"; "planar direction"; "circumferential" and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a particular orientation; constructed and operative in a particular orientation and therefore should not be construed as limiting the invention. The coke oven heating mechanism is also called a coke oven heating system, and the desulfurization and denitrification mechanism is also called a desulfurization and denitrification system.
As shown in fig. 1 to 4, a system for improving desulfurization and denitrification safety of a coke oven comprises a coke oven heating mechanism, a desulfurization and denitrification mechanism, a flue suction detection mechanism, an underground flue 3 and a coke oven chimney 4, wherein the coke oven heating mechanism is communicated with the coke oven chimney 4 through the underground flue 3, one side of the desulfurization and denitrification mechanism is communicated with the underground flue 3 through a pipeline, the other side of the desulfurization and denitrification mechanism is communicated with the coke oven chimney 4 through a pipeline, and the flue suction detection mechanism is installed on the underground flue 3. The flue suction detection mechanism is used for detecting the suction of a flue in real time, and can stop the coke oven heating system when the suction of the desulfurization and denitrification system is insufficient, automatically close the heating gas cock, cut off the gas and ensure the safety of the system. The safety protection device is used for improving the safety of a desulfurization and denitration system and a coke oven heating system, minimizing the greater safety risk of the desulfurization and denitration system and the coke oven heating system, and avoiding the occurrence of malignant accidents.
A gravity gate valve 5 is arranged in the coke oven chimney 4, and when the desulfurization and denitrification system does not work; the flue gas generated by heating the coal gas in the heating system of the coke oven 1 passes through the underground flue 3 and reaches the position of the gravity gate valve 5, and the flue gas passes through the gravity gate valve 5 and enters the chimney 4 because the gravity gate valve 5 is in an open state; and is discharged to the atmosphere.
When the desulfurization and denitrification system works; flue gas generated by heating coal gas in a heating system of the coke oven 1 passes through an underground flue 3 and reaches the position of a gravity gate valve 5; the gravity gate valve 5 is in a closed state, so that the flue gas in the underground flue 3 is separated from the chimney 4, and the flue gas in the underground flue 3 enters the adsorption tower 14 through the desulfurization and denitrification inlet pipe 6, the flue gas inlet valve 7 and the adsorption tower inlet valve 8; the flue gas treated by the adsorption tower 14 is discharged to a chimney 4 through an outlet valve 9 of the adsorption tower, a booster fan 10 and a flue gas outlet valve 11, and finally discharged to the atmosphere.
The flue suction detection mechanism comprises a pressure transmitter I12, a pressure transmitter II 13 and a pressure transmitter III 15, the pressure transmitter I12, the pressure transmitter II 13 and the pressure transmitter III 15 are connected in parallel on the underground flue 3, and the pressure transmitter I12, the pressure transmitter II 13 and the pressure transmitter III 15 are electrically connected with the coke oven heating mechanism through a PLC (programmable logic controller).
The coke oven heating mechanism comprises a coke oven 1, a coke oven heating gas cock 2, a cock brace 16 and a power assembly for driving the cock brace 16 to move, wherein the gas is communicated with the coke oven 1 through a pipeline to supply fuel to the coke oven 1, the coke oven heating gas cock 2 is arranged on a gas conveying pipeline and is used for controlling the on-off of the coke oven heating gas, the cock brace 16 is connected with the coke oven heating gas cock 2 through a connecting rod, and the cock brace 16 controls the rotation of the coke oven heating gas cock 2. The power assembly comprises a hydraulic cylinder 20 for driving the gas cock to move, an unloading valve 23, an energy accumulator 28 and an oil tank 26, the cock brace 16 is connected with an expansion rod of the hydraulic cylinder 20, the energy accumulator 28 is communicated with the hydraulic cylinder 20 through an oil way, the unloading valve 23 is arranged on the oil way and is positioned between the energy accumulator 28 and the hydraulic cylinder 20, and the unloading valve 23 is electrically connected with the PLC.
Three smoke pressure detection meters, namely a pressure transmitter I12, a pressure transmitter II 13 and a pressure transmitter III 15, are arranged on the underground flue 3; detecting the suction force of the smoke in the underground flue 3 in real time; the pressure detection of the underground flue 3 is a key point of safety control. The measured values of the three pressure transmitters I12, II 13 and III 15 are compared in pairs in real time, two measured values with the minimum difference are selected from the two measured values, then an absolute value is taken from the two selected measured values, the minimum absolute value is selected as an actual optimal value to be used for being compared with a linkage value set in a PLC, the actual optimal value is the actual value of one of the three pressure transmitters, the actual optimal value is a dynamic change value, namely the actual optimal value can be the measured value of the pressure transmitter I12, can also be the measured value of the pressure transmitter II 13 and can also be the measured value of the pressure transmitter III 15, and the specific selection is judged according to the judgment principle. The interlocking value set in the PLC is-100 pa, if the actual optimal value is larger than the interlocking value-100 pa and exceeds 5s, the suction force of the flue is insufficient, the coke oven heating mechanism needs to be controlled in an interlocking manner to stop heating, at the moment, the PLC sends a command to control the action of the unloading valve (23), the unloading valve (23) is triggered to lose power, the high-pressure oil of the energy accumulator (28) enters the right rod cavity on the right side of the hydraulic cylinder (20) through the unloading valve (23), the coke oven heating gas cock (2) is closed, the gas is cut off, and the coke oven heating mechanism stops heating.
In order to further improve the reliability of the detection of the suction force of the underground flue 3, when the over-range condition occurs at any measuring point of three pressure transmitters I12, II 13 and III 15 for detecting the suction force of the flue, namely the measured value of the pressure transmitter exceeds the range of the pressure transmitter, the pressure transmitter is problematic, a signal is sent to the PLC, the PLC sends a command to control the action of the unloading valve 23, the linkage with the coke oven heating system is realized, the coke oven heating mechanism stops heating, and the safety of equipment is prevented from being endangered by error signals.
And the circuit detection of three pressure transmitters I12, II 13 and III 15 for increasing the flue suction detection is carried out, when the circuit abnormality is diagnosed, a signal is sent to the PLC, the PLC sends a command to control the action of the unloading valve 23 to carry out interlocking control, and the heating system of the coke oven 1 stops heating. The false signal that avoids interfering the production influences normal chain action, avoids appearing the pressure transmitter trouble or the pressure pipe jam etc. circumstances that detect 3 suctions of underground flue, chain malfunctioning problem.
The gas of the coke oven heating mechanism is reliably cut off, and the intrinsic safety is realized. The coke oven heating mechanism (namely a coke oven heating system) adopts a coke oven heating gas cock 2 to control the on and off of heating gas; the gas tap 2 is connected to a tap pull 16 and finally to a drive cylinder 20.
The coke oven heating mechanism drives the gas cock 2 to be opened or closed through the hydraulic cylinder 20, when the lines of the pressure transmitter I12, the pressure transmitter II 13 and the pressure transmitter III 15 are normal, the measured values of the three pressure transmitters are all within the self-measuring range, and the actual optimal value obtained after the measured values of the three pressure transmitters are compared is smaller than the interlocking value set in the PLC, the PLC sends an instruction to control the unloading valve 23 to be in an electrified state, the unloading valve 23 is communicated with the oil tank 26, the safety oil way between the energy accumulator 28 and the hydraulic cylinder 20 is disconnected, the coke oven heating gas cock 2 is in an opened state, and the coke oven heating system normally runs.
When the lines of the pressure transmitter I12, the pressure transmitter II 13 and the pressure transmitter III 15 are normal or the measured values of the three pressure transmitters are not in the range of the pressure transmitter I or the measured values of the three pressure transmitters are compared to obtain an actual optimal value which is greater than a linkage value of-100 pa and more than 5s set in the PLC, triggering a safety linkage mode of the PLC, and receiving a safety linkage signal from the PLC by the unloading valve 23; when the unloading valve 23 is triggered to lose power, the high-pressure oil in the energy accumulator 28 enters the rod cavity on the right side of the hydraulic cylinder 20 through the unloading valve 23, the coke oven heating gas cock 2 is closed, the gas is cut off, and the coke oven heating mechanism stops heating. In addition, when the external large-scale power failure and other extreme conditions occur, the unloading valve 23 is de-energized, and the hydraulic cylinder 20 is driven to close gas by the energy in the energy accumulator 28; after the unloading valve 23 is de-energized, the valve core is reset through the spring 25, so that the reliability is high without depending on external energy, and the reliable shutoff of coke oven heating gas under various extreme conditions is realized.
The gravity gate valve 5 is arranged in the coke oven chimney 4, the gravity gate valve 5 comprises a winch 51, a gate plate 52 and a DCS controller, the gate plate 52 is arranged at the intersection of the underground flue 3 and the coke oven chimney 4 in a sliding mode, the upper end of the gate plate 52 is connected with the winch 51 through a rope and a pulley, and the gate plate 52 is driven to move up and down through forward and reverse rotation of the winch 51, so that the gravity gate valve 5 is opened and closed.
The SOx/NOx control mechanism includes SOx/NOx control flue gas inlet pipe way 6, adsorption tower 14, SOx/NOx control exhanst gas outlet pipe way 17, SOx/NOx control flue gas inlet pipe way 6 and 3 intercommunications in the underground flue are passed through to the entry of adsorption tower 14, SOx/NOx control exhanst gas outlet pipe way 17 and chimney 4 intercommunication are passed through to the export of adsorption tower 14, be equipped with flue gas inlet valve 7 on the SOx/NOx control flue gas inlet pipe way 6, be equipped with flue gas outlet valve 11 on the SOx/NOx control exhanst gas outlet pipe way 17.
The entry of adsorption tower 14 is equipped with three adsorption tower inlet valve 8, and 8 parallel connection of three adsorption tower inlet valve are on SOx/NOx control flue gas inlet pipe 6, and the export of adsorption tower 14 is equipped with three adsorption tower outlet valve 9, and three adsorption tower outlet valve 9 parallel connection is on SOx/NOx control flue gas outlet pipe 17, still is equipped with booster fan 10 on the SOx/NOx control flue gas outlet pipe 17, and booster fan 10 is located between adsorption tower outlet valve 9 and the flue gas outlet valve 11. The flue gas inlet valve 7, the adsorption tower inlet valve 8, the adsorption tower outlet valve 9, the booster fan 10 and the flue gas outlet valve 11 are all electrically connected with the DCS controller, and simultaneously, the flue gas inlet valve 7, the adsorption tower inlet valve 8, the adsorption tower outlet valve 9, the booster fan 10 and the flue gas outlet valve 11 are all electrically connected with the PLC controller.
When any one of the conditions of the stop of the booster fan 10, the closing of the flue gas inlet valve 7, the closing of two of the adsorption tower inlet valves 8, the closing of two of the adsorption tower outlet valves 9 and the closing of the flue gas outlet valve 11 occurs, or when the system is in large-area power failure, a signal is sent to the DCS controller, the DCS controller receives the signal to trigger the electromagnetic valve 55 in the gravity gate valve 5 to lose power, the gravity gate valve 5 is automatically opened under the action of the counterweight II 54 and the counterweight I53, and the flue gas is directly discharged from a chimney; meanwhile, a signal is transmitted to the PLC, the PLC receives the signal to trigger the unloading valve 23 to lose power, high-pressure oil of the energy accumulator 28 enters a rod cavity on the right side of the hydraulic cylinder 20 through the unloading valve 23, the coke oven heating gas cock 2 is closed, then gas is cut off, the coke oven heating mechanism stops heating, smoke is prevented from being accumulated in a flue and mixed with the gas to explode, and the purposes of safety and reliability are achieved. Not only the coal gas is cut off, but also the smoke is discharged, and the safety of the system is further improved.
Based on the system for improving the desulfurization and denitrification safety of the coke oven, the invention also relates to a control method for improving the desulfurization and denitrification safety of the coke oven, which comprises the following steps:
a. when the desulfurization and denitrification mechanism does not work, the gravity gate valve 5 is opened, and flue gas generated by heating coal gas in a heating system of the coke oven 1 directly enters a chimney 4 through an underground flue 3 and is discharged into the atmosphere;
b. when the desulfurization and denitrification mechanism works, the gravity gate valve 5 is closed, the flue gas in the underground flue 3 is separated from the chimney 4, the flue gas in the underground flue 3 enters the desulfurization and denitrification mechanism, passes through the desulfurization and denitrification mechanism, then reaches the chimney 4, and is discharged into the atmosphere;
c. the suction of the underground flue is detected in real time to control the heating of the coke oven, when the suction of the desulfurization and denitrification system is insufficient, the heating mechanism of the coke oven can be stopped, the heating gas cock is automatically closed, and the gas is cut off to ensure the safety of the system;
comparing the measured values of the pressure transmitter I12, the pressure transmitter II 13 and the pressure transmitter III 15 of the three pressure transmitters in real time in pairs, selecting two measured values with the minimum difference from the two measured values, taking absolute values of the two selected measured values, and finally selecting the minimum absolute value as an actual optimal value for being compared with a linkage value set in a PLC (programmable logic controller), wherein if the actual optimal value is smaller than-100 pa of the linkage value and continuously exceeds 5s, the suction force of a flue is not enough, a coke oven heating mechanism needs to be controlled in a linkage manner to stop heating, at the moment, the PLC sends an instruction to control the action of an unloading valve 23, the unloading valve 23 is triggered to lose power, high-pressure oil of an energy accumulator 28 enters a right rod cavity on the right side of a hydraulic cylinder 20 through the unloading valve 23, a coke oven heating gas cock 2 is closed, the gas is cut off, and the coke oven heating mechanism stops heating;
when the over-range condition occurs at any measuring point of three pressure transmitters I12, II 13 and III 15 for detecting the suction force of the flue, namely the measured value of the pressure transmitter exceeds the range of the self-range, the pressure transmitter is problematic, a signal is transmitted to a PLC controller, the PLC controller controls an unloading valve 23 to act, and a heating system of the coke oven 1 is interlocked to stop heating;
in order to further increase the safety of the flue suction, the line detection of three pressure transmitters I12, II 13 and III 15 for detecting the flue suction is increased, and when the line is diagnosed to be abnormal, linkage is carried out, and the heating system of the coke oven 1 stops heating. The false signal that avoids interfering the production influences normal chain action, avoids appearing the pressure transmitter trouble or the pressure pipe jam etc. circumstances that detect 3 suctions of underground flue, chain malfunctioning problem.
Specifically, when the lines of the pressure transmitter I12, the pressure transmitter II 13 and the pressure transmitter III 15 are normal or the measured values of the three pressure transmitters are not in the range of the pressure transmitter I or the measured values of the three pressure transmitters are compared to obtain an actual optimal value which is greater than a linkage value of-100 pa and more than 5s set in the PLC, a safety linkage mode of the PLC is triggered, and the unloading valve 23 receives a safety linkage signal from the PLC; when the unloading valve 23 is triggered to lose power, the high-pressure oil in the energy accumulator 28 enters the right rod cavity on the right side of the hydraulic cylinder 20 through the unloading valve 23, the coke oven heating gas cock 2 is closed, the gas is cut off, and the coke oven heating mechanism stops heating. In addition, when the external large-scale power failure and other extreme conditions occur, the unloading valve 23 is de-energized, and the hydraulic cylinder 20 is driven to close gas by the energy in the energy accumulator 28; after the unloading valve 23 is de-energized, the valve core is reset through the spring 25, so that the reliability is high without depending on external energy, and the reliable shutoff of coke oven heating gas under various extreme conditions is realized.
d. Detecting the working conditions of a flue gas inlet valve 7, an adsorption tower inlet valve 8, an adsorption tower outlet valve 9, a booster fan 10 and a flue gas outlet valve 11 in real time, and controlling the actions of a coke oven heating mechanism and a gravity gate valve 5;
in order to further enhance the safety of the system, when any one of the conditions of stopping the booster fan 10, closing the flue gas inlet valve 7, closing two of the adsorption tower inlet valves 8, closing two of the adsorption tower outlet valves 9 and closing the flue gas outlet valve 11 occurs, or when the system is in large-area power failure, a signal is sent to the DCS controller, the DCS controller receives the signal to trigger the electromagnetic valve 55 in the gravity gate valve 5 to lose power, the gravity gate valve 5 is automatically opened under the action of the counterweight II 54 and the counterweight I53, and flue gas is directly discharged from a chimney; meanwhile, a signal is transmitted to the PLC, the PLC receives the signal to trigger the unloading valve 23 to lose power, high-pressure oil of the energy accumulator 28 enters a rod cavity on the right side of the hydraulic cylinder 20 through the unloading valve 23, the coke oven heating gas cock 2 is closed, then gas is cut off, the coke oven heating mechanism stops heating, smoke is prevented from being accumulated in a flue and mixed with the gas to explode, and the purposes of safety and reliability are achieved.
As shown in fig. 4, five signals of desulfurization and denitrification are sent to the DCS system for logic processing; the booster fan stop signals comprise stop signals under the conditions of frequency conversion and power frequency, a desulfurization and denitrification flue gas inlet valve closing signal, a desulfurization and denitrification flue gas outlet valve closing signal, two valve closing signals in an adsorption tower inlet valve and two valve closing signals in an adsorption tower outlet valve, and when any one of the five conditions is met, the signals are sent to a coke oven heating control system, and the coke oven heating control system receives abnormal signals sent by the desulfurization and denitrification system, carries out linkage stop heating and closes heating coal gas; meanwhile, signals are transmitted to the gravity gate valve, the electromagnetic valve of the gravity gate valve is de-energized, the gravity gate valve is automatically opened under the action of the counterweight II and the counterweight I, and smoke is directly discharged from the chimney.
Comparing the actual values of the three pressure transmitters for detecting the suction of the flue in pairs, selecting two pressure transmitters with the minimum difference value, then comparing absolute values, selecting the actual value with the minimum absolute value as an optimal value, comparing the optimal value with a linkage value of-100 pa, and triggering linkage control if the optimal value is greater than-100 pa and exceeds 5 s; in addition, whether three pressure transmitters have line faults or overrange conditions or not needs to be detected, when any one of the conditions is met, the situation that the suction force of the flue is insufficient or the pressure transmitters have faults is judged, the heating system of the coke oven stops heating in a linkage mode, and the heating coal gas is closed.
The invention adopts two-degree safety redundant control, the coke oven heating mechanism and the desulfurization and denitrification mechanism can achieve intrinsic safety, and the safety of the system can be reliably ensured under the extreme condition of signal failure or system power failure of the control system.
The invention sends equipment signals related to various unsafe states to a desulfurization and denitrification control system, carries out logic processing and outputs signals to a coke oven heating system, and the coke oven heating system receives abnormal state signals of the desulfurization and denitrification system, triggers related heating stop, cuts off heating coal gas and ensures the safety of the system; meanwhile, the coke oven heating mechanism needs to detect the smoke suction force, and when the smoke suction force is insufficient, the related heating stop is triggered, the heating coal gas is cut off, and the system safety is ensured; in order to ensure that the coke oven heating system gas cylinder closes the hydraulic oil circuit and the hydraulic energy accumulator is controlled by the electromagnetic unloading valve when the system is powered off, the pressure of the energy accumulator automatically closes the heating gas when the system is powered off, and the safety of the system is ensured.
The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the technical solution of the invention or to apply the concept and technical solution of the invention directly to other occasions without modification.
Claims (10)
1. The utility model provides a system for be used for improving coke oven SOx/NOx control security which characterized in that: the coke oven heating mechanism is communicated with the coke oven chimney (4) through the underground flue (3), one side of the desulfurization and denitrification mechanism is communicated with the underground flue (3) through a pipeline, the other side of the desulfurization and denitrification mechanism is communicated with the coke oven chimney (4) through a pipeline, and the flue suction detection mechanism is installed on the underground flue (3).
2. The system for improving the desulfurization and denitrification safety of the coke oven according to claim 1, wherein: flue suction detection mechanism includes pressure transmitter I (12), pressure transmitter II (13) and pressure transmitter III (15), and pressure transmitter I (12), pressure transmitter II (13), pressure transmitter III (15) parallel connection are on underground flue (3), and pressure transmitter I (12), pressure transmitter II (13) and pressure transmitter III (15) are connected with coke oven heating mechanism electricity through the PLC controller.
3. The system for improving the desulfurization and denitrification safety of the coke oven according to claim 2, wherein: the coke oven heating mechanism comprises a coke oven (1), a coke oven heating gas cock (2), a cock brace (16) and a power assembly for driving the cock brace (16) to move, wherein gas is communicated with the coke oven (1) through a pipeline to supply fuel to the coke oven (1), the coke oven heating gas cock (2) is arranged on the coke oven (1) to control the opening and closing of a gas conveying pipeline, the cock brace (16) is connected with the coke oven heating gas cock (2) through a connecting rod, and the cock brace (16) controls the rotation of the coke oven heating gas cock (2).
4. The system for improving the desulfurization and denitrification safety of the coke oven according to claim 3, wherein: the power assembly comprises a hydraulic cylinder (20) for driving the gas cock to move, an unloading valve (23), an energy accumulator (28) and an oil tank (26), a cock brace (16) is connected with a telescopic rod of the hydraulic cylinder (20), the energy accumulator (28) is communicated with the hydraulic cylinder (20) through an oil way, the unloading valve (23) is installed on the oil way and located between the energy accumulator (28) and the hydraulic cylinder (20), and the unloading valve (23) is electrically connected with the PLC.
5. The system for improving the desulfurization and denitrification safety of the coke oven according to claim 4, wherein: the coke oven chimney (4) is internally provided with a gravity gate valve (5), the gravity gate valve (5) comprises a winch (51), a gate (52) and a DCS (distributed control system) controller, the gate (52) is arranged at the intersection of the underground flue (3) and the coke oven chimney (4) in a sliding manner, the upper end of the gate (52) is connected with the winch (51) through a rope and a pulley, and the forward and reverse rotation of the winch (51) drives the gate (52) to move up and down.
6. The system for improving the desulfurization and denitrification safety of the coke oven according to claim 5, wherein: gravity gate valve (5) still include counter weight I (53), counter weight II (54) and solenoid valve (55), counter weight I (53) and counter weight II (54) pass through rope and pulley symmetry and set up the both sides in flashboard (52), counter weight I (53) and hoist (51) cooperation are used, be located the below of counter weight II (54) on solenoid valve (55) installing support, solenoid valve (55) are connected with the DCS controller electricity, when solenoid valve (55) were electrified, the solenoid valve head stretches out, the counter weight II (54) is held to the solenoid valve, when solenoid valve (55) loses the electricity, the solenoid valve withdrawal stretches out, solenoid valve and counter weight II (54) contactless, counter weight II (54) fall with counter weight I (53) together and drive flashboard (52) and rise.
7. The system for improving the desulfurization and denitrification safety of the coke oven according to claim 6, wherein: SOx/NOx control mechanism includes SOx/NOx control flue gas inlet pipeline (6), adsorption tower (14), SOx/NOx control exhanst gas outlet pipeline (17), the entry of adsorption tower (14) is passed through SOx/NOx control flue gas inlet pipeline (6) and is linked together with underground flue (3), the export of adsorption tower (14) is passed through SOx/NOx control exhanst gas outlet pipeline (17) and chimney (4) intercommunication, be equipped with flue gas inlet valve (7) on SOx/NOx control flue gas inlet pipeline (6), be equipped with flue gas outlet valve (11) on SOx/NOx control exhanst gas outlet pipeline (17).
8. The system for improving the desulfurization and denitrification safety of the coke oven according to claim 7, wherein: the entry of adsorption tower (14) is equipped with three adsorption tower inlet valve (8), and three adsorption tower inlet valve (8) parallel connection is on SOx/NOx control flue gas inlet pipe way (6), and the export of adsorption tower (14) is equipped with three adsorption tower outlet valve (9), and three adsorption tower outlet valve (9) parallel connection is on SOx/NOx control flue gas outlet pipe way (17), still is equipped with booster fan (10) on SOx/NOx control flue gas outlet pipe way (17), and booster fan (10) are located between adsorption tower outlet valve (9) and flue gas outlet valve (11).
9. A control method for improving the desulfurization and denitrification safety of a coke oven is characterized by comprising the following steps: the system for improving the desulfurization and denitrification safety of the coke oven according to any one of claims 1 to 8, wherein the control method comprises the following steps:
a. when the desulfurization and denitrification mechanism does not work, the gravity gate valve (5) is opened, and flue gas generated by heating coal gas in a heating system of the coke oven (1) directly enters the chimney (4) through the underground flue (3) and is discharged into the atmosphere;
b. when the desulfurization and denitrification mechanism works, the gravity gate valve (5) is closed, the flue gas in the underground flue (3) is separated from the chimney (4), the flue gas in the underground flue (3) enters the desulfurization and denitrification mechanism, passes through the desulfurization and denitrification mechanism, then reaches the chimney (4), and is discharged into the atmosphere;
c. the suction of the underground flue is detected in real time to control the heating of the coke oven, when the suction of the desulfurization and denitrification system is insufficient, the heating mechanism of the coke oven can be stopped, the heating gas cock is automatically closed, and the gas is cut off to ensure the safety of the system;
d. and the working conditions of the flue gas inlet valve (7), the adsorption tower inlet valve (8), the adsorption tower outlet valve (9), the booster fan (10) and the flue gas outlet valve (11) are detected in real time, and the flue gas inlet valve, the adsorption tower inlet valve, the booster fan and the flue gas outlet valve are used for controlling the heating mechanism of the coke oven and the gravity gate valve (5) to act.
10. The control method for improving the desulfurization and denitrification safety of the coke oven according to claim 9, characterized by comprising the following steps: the specific operation of c is as follows: comparing the measured values of the pressure transmitter I (12), the pressure transmitter II (13) and the pressure transmitter III (15) pairwise in real time, selecting two measured values with the minimum difference, taking an absolute value of the two selected measured values, and finally selecting the minimum absolute value as an actual optimal value; or when any measuring point in the pressure transmitter I (12), the pressure transmitter II (13) and the pressure transmitter III (15) has an overrange, or any line of the pressure transmitter I (12), the pressure transmitter II (13) and the pressure transmitter III (15) has a fault, a signal is transmitted to the PLC controller, the PLC controller controls the action of the unloading valve (23), and the heating system of the coke oven (1) is interlocked to stop heating;
the specific operation of d is as follows: when any one of the conditions of stopping the booster fan (10), closing the flue gas inlet valve (7), closing two of the adsorption tower inlet valves (8), closing two of the adsorption tower outlet valves (9) and closing the flue gas outlet valve (11) occurs, or when the system is in large-area power failure, the electromagnetic valve (55) in the gravity gate valve (5) is de-energized, and the gravity gate valve (5) is automatically opened under the action of the counterweight II (54) and the counterweight I (53); meanwhile, a signal is transmitted to the PLC controller, the PLC controller controls the unloading valve (23) to act, and the heating system of the coke oven (1) is interlocked to stop heating.
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