Special start-stop control method and system for coke oven heating

Abstract

The invention discloses a start-stop control method and system special for coke oven heating, and belongs to the technical field of coke oven heating, and the start-stop control method comprises the following steps: S1, acquiring coke oven heating parameters including basement gas main pipe pressure, first-class equipment state, second-class equipment state, third-class equipment state, air blower state and coke discharge state; s2, performing logic judgment on the parameters, executing S3 when any one of the following conditions is met, and otherwise, continuing heating; the first condition is that the pressure of the basement gas main pipe is lower than 500 Pa and has a continuous descending trend; the second condition is that the first equipment state is damaged; conditions III and II are that the state of the equipment fails; 4, the state of the third equipment is damaged; 5, the air blower stops running; the sixth condition is that coke cannot be discharged within the preset duration; s3, controlling the coke oven to stop heating; and S4, controlling the coke oven to recover heating. According to the invention, harm possibly caused by improper operation when the coke oven stops heating or resumes heating can be reduced, and normal operation of the coke oven is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of coke oven heating, and in particular relates to a start-stop control method and system dedicated to coke oven heating. Background Art

[0002] Modern coke ovens are composed of several key parts, including carbonization chamber, combustion chamber, heat storage chamber, furnace top area, flue area and basement. The carbonization chamber is a crucial part of the coke oven, which is responsible for heating coal to produce coke. The combustion chamber plays the role of providing the necessary temperature for the carbonization chamber. Generally, coke oven gas heating is a common heating method. However, in some special cases, the coke oven may need to stop heating. If mistakes are made during command or operation, a series of negative effects may be brought about. When the coke oven stops heating, if the flue suction is not properly controlled, the pressure at the fire hole of the vertical fire channel of the combustion chamber will gradually decrease, and eventually form a negative pressure state. In this case, it is very easy to inhale cold air, resulting in a large loss of heat. At the exhaust gas thallium, if the air intake is not properly controlled, the influx of a large amount of air will further increase the loss of heat energy and may cause cracks in the gaps of refractory bricks, which requires regular inspection and maintenance, thereby increasing maintenance costs and workload. In addition, during on-site command or coordination, if the instructions are not conveyed in place or the operation is not performed properly, personal injury may occur. If negative pressure occurs for a long time during the heating stop period, it may also cause a gas explosion. If the exchange cock and the addition and subtraction cock are not closed, the gas may leak and cause a fire or explosion.

[0003] During the process of coke oven reheating, if the temperature is not properly controlled and the high temperature is not handled in time, it may cause the carbonization chamber wall bricks to burn and deform, resulting in leakage of the coke oven wall, which will affect the coal loading and coke pushing operations in serious cases; and if the low temperature is not handled in time, it will cause coke pushing difficulties and affect the smooth production. If the parameters such as gas flow and air inlet door opening are not set properly, it may lead to incomplete or excessive combustion, produce a large amount of harmful gases, and also affect the thermal efficiency of the coke oven, and may even cause environmental accidents. Therefore, improper operation may cause serious damage to the stability, production efficiency, equipment life and environmental protection of the coke oven.

[0004] In view of the above situation, the stopping and resuming heating process of the coke oven must be carried out in strict accordance with the operating procedures in an orderly manner to avoid misoperation and ensure the safe and stable operation of the coke oven. Only in this way can the potential risks be minimized, the long-term and efficient operation of the coke oven be guaranteed, and the safety of the staff and environmental protection be ensured. Summary of the invention

[0005] The object of the present invention is to provide a start-stop control method and system dedicated to coke oven heating, which are used to reduce the hazards that may be caused by improper operation when the coke oven stops heating or resumes heating, and ensure the normal operation of the coke oven.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The first object of the present invention is to provide a start-stop control method dedicated to coke oven heating, comprising:

[0008] S1. Obtaining parameters related to coke oven heating, including basement gas main pressure, first-class equipment status, second-class equipment status, third-class equipment status, blower status, and coke output status;

[0009] S2, perform logical judgment on the parameters, and when any of the following conditions is met, execute S3, otherwise, continue heating;

[0010] Condition 1: The basement gas main pressure is lower than 500Pa and has a downward trend;

[0011] Condition 2: The status of Class I equipment is damaged;

[0012] Condition 3: The status of the Class II equipment is a failure;

[0013] Condition 4: The status of Category 3 equipment is damaged;

[0014] Condition 5: The blower stops running;

[0015] Condition 6: The image cannot be out of focus within the preset time;

[0016] S3, control the coke oven to stop heating;

[0017] S4. Control the coke oven to resume heating.

[0018] Preferably, the first type of equipment status includes whether the gas pipeline and pipe fittings are damaged; the second type of equipment status includes whether the flue system fails; and the third type of equipment status includes whether the exchange system is damaged.

[0019] Preferably, S3 includes:

[0020] During the period of stopping heating, the coke pushing operation is stopped and the coke oven production is stopped;

[0021] Close all the exchange cocks in the coke oven basement and stop after the exhaust gas is reversed;

[0022] Close all the adding and subtracting cocks in the coke oven basement;

[0023] The gas flow flap is fixed and manually operated to be in the fully open position;

[0024] When the basement gas main pressure is lower than 200Pa, steam is introduced to maintain the pressure. After the steam is introduced, the release valve of the automatic release water seal is gradually opened while monitoring the main pressure, and the main valve of the gas main is gradually closed;

[0025] When stopping heating, first cut off the gas and then reduce the suction;

[0026] When the gas is turned off, reduce the suction of the flue gas ducts on both sides of the coke machine to below 100Pa. If the suction cannot be reduced by adjusting the flaps of the flue gas ducts, adjust the flaps of the main flue gas duct;

[0027] When heating is stopped for more than half an hour and still not restored, cover the air inlet door, leaving only a gap of 5 mm to 10 mm, so that the suction force at the top of the ascending airflow heat storage chamber is 10Pa greater than normal in coordination with the reduced suction force of the flue gas distribution duct;

[0028] When an automatic reversing device is installed, place the operating selector in the stop position;

[0029] When the heating is stopped, if the switching cycle is 20 minutes, the exhaust gas is exchanged every 40 minutes;

[0030] It is forbidden to place the air cover and the exhaust gas thallium in the middle position;

[0031] When the heating is stopped, if the basement gas cock blasts or the automatic relief water seal vibrates due to excessive pressure in the gas main, open the relief valve and add water to the automatic relief water seal as appropriate, or close the valve from the gas main to the automatic relief water seal;

[0032] If an accident occurs in the exchange system, all the adding and subtracting cocks will be closed directly;

[0033] During the period of stopping heating, the pressure of the coke oven gas collecting pipe is 20Pa to 30Pa higher than normal.

[0034] Preferably, S4 includes:

[0035] If steam is used to maintain pressure, open the main gas valve first, and gradually close the steam to drive away the steam with gas;

[0036] When the steam coming out of the vent pipe is less than the threshold, take a sample for gas explosion test. If the test is qualified, close the vent valve;

[0037] When the gas main pressure is less than 3000Pa, the relief valve will be closed;

[0038] Restore the exhaust gas inlet door opening of the flue area on the machine and coke sides, and restore the suction of the flue on the machine and coke sides to normal;

[0039] Open the basement exchange cock;

[0040] Open the basement add / subtract cocks in batches according to the gas pressure to deliver gas to the combustion chamber;

[0041] When the adding and subtracting cocks have been partially opened, close the relief valve;

[0042] Check whether each heating equipment and instrument is in normal working condition;

[0043] If the heating is stopped due to the switching system inspection or accident, the switch must be tested manually and then electrically before resuming heating. Heating can only be resumed after it is normal;

[0044] It is forbidden to place the air cover and the exhaust gas thallium in the middle position;

[0045] It is prohibited to supply gas to multiple coke ovens at the same time;

[0046] If the heating stop time exceeds the threshold and the vertical fire channel temperature drops below the gas ignition point, first add ignition materials to the vertical fire channel and then supply gas; before supplying gas, sample the standard fire channel and burner temperature;

[0047] When an automatic reversing device is installed, put the operation selector in the automatic position;

[0048] Only after the above conditions return to normal can the coking operation be carried out.

[0049] The second object of the present invention is to provide a start-stop control system dedicated to coke oven heating, comprising:

[0050] A parameter acquisition module, which acquires parameters related to coke oven heating, including basement gas main pressure, first-class equipment status, second-class equipment status, third-class equipment status, blower status, and coke output status;

[0051] The parameter analysis module performs logical judgment on the parameters. When any of the following conditions is met, the start-stop control module is entered; otherwise, heating continues;

[0052] Condition 1: The basement gas main pressure is lower than 500Pa and has a downward trend;

[0053] Condition 2: The status of Class I equipment is damaged;

[0054] Condition 3: The status of the Class II equipment is a failure;

[0055] Condition 4: The status of Category 3 equipment is damaged;

[0056] Condition 5: The blower stops running;

[0057] Condition 6: The image cannot be out of focus within the preset time;

[0058] Stop the control module to control the coke oven to stop heating;

[0059] Start the control module to control the coke oven to resume heating.

[0060] Preferably, the first type of equipment status includes whether the gas pipeline and pipe fittings are damaged; the second type of equipment status includes whether the flue system fails; and the third type of equipment status includes whether the exchange system is damaged.

[0061] Preferably, the stop control module includes the following control conditions:

[0062] During the period of stopping heating, the coke pushing operation is stopped and the coke oven production is stopped;

[0063] Close all the exchange cocks in the coke oven basement and stop after the exhaust gas is reversed;

[0064] Close all the adding and subtracting cocks in the coke oven basement;

[0065] The gas flow flap is fixed and manually operated to be in the fully open position;

[0066] When the basement gas main pressure is lower than 200Pa, steam is introduced to maintain the pressure. After the steam is introduced, the release valve of the automatic release water seal is gradually opened while monitoring the main pressure, and the main valve of the gas main is gradually closed;

[0067] When stopping heating, first cut off the gas and then reduce the suction;

[0068] When the gas is turned off, reduce the suction of the flue gas ducts on both sides of the coke machine to below 100Pa. If the suction cannot be reduced by adjusting the flaps of the flue gas ducts, adjust the flaps of the main flue gas duct;

[0069] When heating is stopped for more than half an hour and still not restored, cover the air inlet door, leaving only a gap of 5 mm to 10 mm, so that the suction force at the top of the ascending airflow heat storage chamber is 10Pa greater than normal in coordination with the reduced suction force of the flue gas distribution duct;

[0070] When an automatic reversing device is installed, place the operating selector in the stop position;

[0071] When the heating is stopped, if the switching cycle is 20 minutes, the exhaust gas is exchanged every 40 minutes;

[0072] It is forbidden to place the air cover and the exhaust gas thallium in the middle position;

[0073] When the heating is stopped, if the basement gas cock blasts or the automatic relief water seal vibrates due to excessive pressure in the gas main, open the relief valve and add water to the automatic relief water seal as appropriate, or close the valve from the gas main to the automatic relief water seal;

[0074] If an accident occurs in the exchange system, all the adding and subtracting cocks will be closed directly;

[0075] During the period of stopping heating, the pressure of the coke oven gas collecting pipe is 20Pa to 30Pa higher than normal.

[0076] Preferably, the startup control module includes the following control conditions:

[0077] If steam is used to maintain pressure, open the main gas valve first, and gradually close the steam to drive away the steam with gas;

[0078] When the steam coming out of the vent pipe is less than the threshold, take a sample for gas explosion test. If the test is qualified, close the vent valve;

[0079] When the gas main pressure is less than 3000Pa, the relief valve will be closed;

[0080] Restore the exhaust gas inlet door opening of the flue area on the machine and coke sides, and restore the suction of the flue on the machine and coke sides to normal;

[0081] Open the basement exchange cock;

[0082] Open the basement add / subtract cocks in batches according to the gas pressure to deliver gas to the combustion chamber;

[0083] When the adding and subtracting cocks have been partially opened, close the relief valve;

[0084] Check whether each heating equipment and instrument is in normal working condition;

[0085] If the heating is stopped due to the switching system inspection or accident, the switch must be tested manually and then electrically before resuming heating. Heating can only be resumed after it is normal;

[0086] It is forbidden to place the air cover and the exhaust gas thallium in the middle position;

[0087] It is prohibited to supply gas to multiple coke ovens at the same time;

[0088] If the heating stop time exceeds the threshold and the vertical fire channel temperature drops below the gas ignition point, first add ignition materials to the vertical fire channel and then supply gas; before supplying gas, sample the standard fire channel and burner temperature;

[0089] When an automatic reversing device is installed, put the operation selector in the automatic position;

[0090] Only after the above conditions return to normal can the coking operation be carried out.

[0091] Compared with the prior art, the present invention has the following beneficial effects:

[0092] The present invention first collects various parameter information related to the coke oven heating process, and these parameters may include key data such as temperature, pressure, flow rate, etc. After collecting these data, the present invention uses a series of logical judgment rules to conduct in-depth analysis and judgment on these parameters. Based on the results of these analysis and judgment, the present invention can intelligently determine whether it is necessary to issue a shutdown operation instruction. Since these logical judgments are customized according to the specific parameters of the actual site, the judgment results obtained are more accurate and objective, and can effectively avoid unnecessary shutdowns caused by misjudgment.

[0093] The present invention implements strict procedural management and control over the start-up and stop-down process of the coke oven, ensuring the safety of the coke oven during the start-up and stop-down process. By implementing a series of carefully designed control measures, the present invention can effectively prevent and avoid multiple risks such as safety accidents, equipment damage, production interruption, and environmental protection problems that may be caused by improper operation during the process of stopping heating and restarting heating of the coke oven. In addition, the present invention can also ensure that the start-up and stop operations of the coke oven are completed in the shortest time, thereby quickly improving the operating efficiency of the coke oven, significantly reducing energy consumption and operating costs, and providing strong technical support for the efficient and stable operation of the coke oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] Figure 1 Flowchart of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0095] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0096] See also Figure 1 As shown,

[0097] The first embodiment is a start-stop control method dedicated to coke oven heating, comprising:

[0098] S1. Obtain parameters related to coke oven heating, wherein the parameters include basement gas main pressure, Class I equipment status, Class II equipment status, Class III equipment status, blower status, and coke output status; the Class I equipment status includes whether the gas pipeline and pipe fittings are damaged; the Class II equipment status includes whether the flue system fails; and the Class III equipment status includes whether the exchange system is damaged.

[0099] S2, perform logical judgment on the parameters, and when any of the following conditions is met, execute S3, otherwise, continue heating;

[0100] The first condition is when the basement gas main pressure drops below 500Pa and shows a trend of continuous decline;

[0101] The second condition is that if the gas pipelines, pipes and other related equipment are damaged and the gas supply needs to be suspended for maintenance;

[0102] The third condition is when the flue system equipment fails and cannot maintain the required basic suction;

[0103] The fourth condition is that if the exchange system equipment is damaged and cannot be exchanged normally, thus affecting the heating process;

[0104] The fifth condition is when the blower stops running;

[0105] The sixth condition is that due to various reasons, it is impossible to produce coke for a long time, and even if the gas main pressure is reduced to the minimum value, there is still a risk of high temperature accidents;

[0106] The seventh condition is when the heating is stopped in a planned manner;

[0107] S3, control the coke oven to stop heating;

[0108] 1. During the period of stopping heating, it is necessary to ensure that the coke pushing operation is stopped and the production activities of the coke oven are stopped at the same time.

[0109] 2. All exchange cocks in the coke oven basement should be closed electrically or manually, and ensure that the operation is stopped after the exhaust gas is reversed.

[0110] 3. Close all the adding and subtracting valves in the coke oven basement to ensure that nothing is missed.

[0111] 4. Fix the gas flow flap and manually operate it to the fully open position.

[0112] 5. When the basement gas main pressure is lower than 200Pa, steam needs to be introduced to maintain the pressure. After introducing steam, the release valve of the automatic release water seal should be gradually opened while monitoring the main pressure, and the main valve of the gas main should be gradually closed.

[0113] 6. When stopping heating, you must follow the principle of cutting off the gas first and then reducing the suction.

[0114] 7. When the gas is stopped, the suction of the flue gas ducts on both sides of the machine coke needs to be reduced to below 100 Pa. If the suction cannot be reduced by adjusting the flue gas duct flaps, the main flue gas duct flaps need to be adjusted.

[0115] 8. If the heating is stopped for more than half an hour and still not resumed, the air inlet door must be covered, leaving only a gap of 5-10 mm. In conjunction with the reduced suction of the flue gas duct, the suction at the top of the ascending airflow heat storage chamber is 10Pa greater than normal.

[0116] 9. When equipped with an automatic reversing device, the operating selector should be placed in the stop position.

[0117] 10. When the heating is stopped, the exhaust gas needs to be replaced manually or electrically every hour. If the reversing cycle is 20 minutes, the exhaust gas should be replaced every 40 minutes.

[0118] 11. At no time is the exchange stopped in the middle position allowed, that is, the air cover and the exhaust gas lead cannot be placed in the middle position.

[0119] 12. When the heating is stopped, if the basement gas cock explodes or the automatic relief water seal vibrates due to excessive pressure in the gas main, it is necessary to open the relief valve and add water to the automatic relief water seal according to the situation, or close the valve from the gas main to the automatic relief water seal.

[0120] 13. If the accident is related to the switching system and the switching valve cannot be closed using the switch, all the addition and subtraction valves can be directly closed.

[0121] 14. If the exchange valve cannot be closed by the switch, and the exhaust gas cannot be discharged (for example, the exhaust gas chain is broken, causing all the exhaust gas to fall), if it is dangerous to directly close the addition and subtraction valve, steam should be immediately introduced into the gas main pipe, and the main valve of the gas main pipe should be closed (cut off the gas source) and the dispersion valve should be opened to drive away the gas in the gas main pipe with steam. At the same time, the fire hole cover of the furnace top area and the exhaust gas of the descending airflow in the flue area should be opened as much as possible, and then all the addition and subtraction valves in the basement should be closed.

[0122] 15. When stopping heating in any accident situation, we must analyze the specific situation and grasp the key link of not allowing gas to explode in any area.

[0123] 16. During the period of stopping heating, the pressure of the coke oven gas collecting pipe should be maintained at a level 20-30Pa higher than the normal level.

[0124] S4. Control the coke oven to resume heating.

[0125] 1. If steam has been used for pressure maintenance before, you need to open the valve of the gas main first and gradually turn off the steam so that the steam in the pipeline can be completely driven away by the gas.

[0126] 2. When the steam coming out of the vent pipe has become very weak, it is necessary to take a sample for a gas explosion test. Only when the test result is qualified can the vent valve be slightly closed. However, before the explosion test, the vent valve can also be appropriately closed according to the actual situation.

[0127] 3. If the pressure of the gas main is less than 3000Pa, the relief valve must be completely closed.

[0128] 4. After restoring the opening of the exhaust gas inlet door on the machine side and the coke side flue area, the suction of the machine coke side flue needs to be adjusted to normal. In the process of resuming heating, the principle of restoring suction first and then delivering gas must be followed.

[0129] 5. The basement exchange cock needs to be opened electrically or manually.

[0130] 6. According to the specific situation of gas pressure, open the adding and subtracting valves in the basement in batches to supply gas to the combustion chamber.

[0131] 7. When the adding and subtracting valves have been partially opened, the relief valve should be closed.

[0132] 8. All heating equipment and instruments need to be carefully checked to ensure that they are in normal working condition.

[0133] 9. If the heating is stopped due to an inspection of the switching system or an accident, then before resuming heating, the switch must be tested manually and then electrically to ensure that everything is normal before resuming heating.

[0134] 10. At no time is the exchange stop allowed in the middle position, that is, the air cover and the exhaust gas thallium cannot be placed in the middle position.

[0135] 11. If there are two or more coke ovens, gas cannot be supplied to two or more coke ovens at the same time at any time.

[0136] 12. If the heating is stopped for too long, causing the temperature of the vertical fire channel to drop below the ignition point of the gas, then before supplying the gas, it is necessary to first put ignition materials into the vertical fire channel and then carry out the gas supply operation.

[0137] 13. If the heating is stopped for too long, the temperature of the standard fire channel and the burner should be sampled before supplying gas.

[0138] 14. If an automatic reversing device is installed, the operating selector should be placed in the automatic position.

[0139] 15. Only after all the above operations have returned to normal can the focus pushing operation be carried out.

[0140] The second embodiment is a start-stop control system dedicated to coke oven heating, comprising:

[0141] A parameter acquisition module is used to acquire parameters related to coke oven heating, including basement gas main pressure, Class I equipment status, Class II equipment status, Class III equipment status, blower status, and coke output status; the Class I equipment status includes whether the gas pipeline and pipe fittings are damaged; the Class II equipment status includes whether the flue system fails; and the Class III equipment status includes whether the exchange system is damaged.

[0142] The parameter analysis module performs logical judgment on the parameters. When any of the following conditions is met, the start-stop control module is entered; otherwise, heating continues;

[0143] Condition 1: When the basement gas main pressure drops below 500Pa and shows a continuous downward trend;

[0144] Condition 2: If the gas pipeline, pipe fittings and other equipment are damaged and it is necessary to stop the gas supply for repair;

[0145] Condition 3: When the flue system equipment fails and cannot maintain the required basic suction;

[0146] Condition 4: If the exchange system equipment is damaged and cannot be exchanged, thus affecting normal heating;

[0147] Condition 5: Once the blower stops running;

[0148] Condition 6: When coke cannot be produced for a long time due to various reasons, there is still a risk of high temperature accident even if the gas main pressure is reduced to the minimum value;

[0149] Condition 7: When the heating is stopped in a planned manner;

[0150] Stop the control module to control the coke oven to stop heating;

[0151] 1. During the period of stopping heating, it is necessary to ensure that the coke pushing operation is stopped and the production activities of the coke oven are stopped.

[0152] 2. All exchange cocks in the coke oven basement should be closed electrically or manually, and ensure that the operation is stopped after the exhaust gas is reversed.

[0153] 3. All the adding and subtracting valves in the coke oven basement need to be closed.

[0154] 4. Fix the gas flow flap and manually operate it to the fully open position.

[0155] 5. When the pressure of the basement gas main is lower than 200Pa, steam should be introduced to maintain the pressure. After the steam is introduced, the release valve of the automatic release water seal should be gradually opened while monitoring the main pressure, and the main valve of the gas main should be gradually closed.

[0156] 6. When stopping heating, you must follow the principle of cutting off the gas first and then reducing the suction.

[0157] 7. When the gas is stopped, the suction of the flue gas ducts on both sides of the machine coke needs to be reduced to below 100 Pa. If the suction cannot be reduced by adjusting the flue gas duct flap, the main flue gas duct flap needs to be adjusted.

[0158] 8. If heating is stopped for more than half an hour and still not resumed, the air inlet door must be covered, leaving only a gap of 5-10 mm, so that the suction at the top of the rising airflow heat storage chamber is 10Pa greater than normal in coordination with the reduced suction of the flue gas duct.

[0159] 9. When equipped with an automatic reversing device, the operating selector should be placed in the stop position.

[0160] 10. When the heating is stopped, the exhaust gas should be replaced manually or electrically every hour. If the reversing cycle is 20 minutes, the exhaust gas should be replaced every 40 minutes.

[0161] 11. At no time is the exchange stopped in the middle position allowed, that is, the air cover and the exhaust gas lead cannot be placed in the middle position.

[0162] 12. When the heating is stopped, if the basement gas cock explodes or the automatic relief water seal vibrates due to excessive pressure in the gas main, the relief valve must be opened and water must be added to the automatic relief water seal as appropriate, or the valve from the gas main to the automatic relief water seal must be closed.

[0163] 13. If the accident is related to the switching system and the switching valve cannot be closed using the switch, all the addition and subtraction valves can be directly closed.

[0164] 14. If it is impossible to close the exchange cock using the switch, and it is dangerous to directly close the addition and subtraction cock because the exhaust gas cannot be discharged (for example, the exhaust chain is broken, causing all the exhaust gas to fall), steam should be immediately introduced into the gas main, and the main valve of the gas main should be closed (cut off the gas source) and the dispersion valve should be opened to drive away the gas in the gas main with steam. At the same time, the fire hole cover in the furnace top area and the exhaust gas lead of the descending airflow in the flue area should be opened as much as possible, and then all the addition and subtraction cocks in the basement should be closed.

[0165] 15. When stopping heating under any accident circumstances, we must analyze the specific situation and grasp the key link of not allowing gas to explode in any area.

[0166] 16. During the period of stopping heating, the pressure of the coke oven gas collecting pipe should be maintained at a level 20-30Pa higher than normal.

[0167] Start the control module to control the coke oven to resume heating.

[0168] 1. After using steam to maintain pressure, you need to open the valve of the gas main first and gradually turn off the steam so that the gas can be used to expel the steam in the pipe.

[0169] 2. When the amount of steam coming out of the vent pipe has become very small, it is necessary to take a sample for a gas explosion test. After ensuring that the test results are qualified, the vent valve can be appropriately closed. Before the explosion test, the vent valve can also be appropriately closed according to the actual situation.

[0170] 3. If the pressure of the gas main is less than 3000Pa, the relief valve should be closed immediately.

[0171] 4. When restoring the opening of the exhaust gas inlet door in the machine side and coke side flue area, the suction of the machine coke side flue needs to be adjusted to normal. In the process of resuming heating, the principle of restoring suction first and then delivering gas must be followed.

[0172] 5. Electric or manual operation is required to open the exchange cock in the basement.

[0173] 6. According to the specific situation of gas pressure, open the adding and subtracting valves in the basement in batches to supply gas to the combustion chamber.

[0174] 7. If the adding and subtracting valves have been partially opened, the relief valve should be closed immediately.

[0175] 8. All heating equipment and instruments need to be carefully inspected to ensure that they are in normal working condition.

[0176] 9. If the heating is stopped due to inspection or accident of the switching system, then before resuming heating, the switch must be tested manually and then electrically to ensure that everything is normal before resuming heating.

[0177] 10. At no time is the exchange stopped in the middle position allowed, that is, the air cover and the exhaust gas lead cannot be placed in the middle position.

[0178] 11. If there are two or more coke ovens, gas cannot be supplied to two or more coke ovens at the same time at any time.

[0179] 12. If the heating is stopped for too long, causing the temperature of the vertical fire channel to drop below the ignition point of the gas, then before supplying the gas, it is necessary to first put ignition materials into the vertical fire channel and then carry out the gas supply operation.

[0180] 13. If the heating is stopped for too long, the temperature of the standard fire channel and the burner should be sampled before supplying gas.

[0181] 14. If an automatic reversing device is installed, the operating selector should be placed in the automatic position during operation.

[0182] 15. Focus pushing operation can only be carried out after all the above operations have returned to normal.

[0183] During the implementation of the present invention, strict operating procedures are always followed to ensure that each step is carried out in an orderly manner. In particular, when stopping heating, we adhere to an important principle, that is, when stopping heating, the gas supply must be cut off first, and then the suction of the flue is gradually reduced. The execution of this sequence is crucial to ensure the safety of the entire operation process.

[0184] Through such operation, the suction of the flue can achieve a smooth transition, effectively avoiding the problem of excessive negative pressure caused by improper operation. Reducing the amount of unnecessary air entering and thus reducing heat loss is of great significance to improving energy efficiency and ensuring production safety. In addition, we also emphasize the accurate transmission and strict implementation of instructions to ensure that every operator can clearly understand and strictly abide by the operating steps and instructions, so as to effectively prevent and eliminate the occurrence of gas leakage accidents. During the period of stopping heating, we also need to closely monitor the pressure in the furnace to prevent safety hazards caused by long-term negative pressure. In order to resume production quickly, when resuming heating, we must follow a basic principle, that is, to restore the suction of the flue first, and then start to deliver gas. At the same time, we also need to measure and adjust the temperature in time to prevent adverse effects on production due to excessively high or low temperatures. Through these meticulous measures, we can effectively reduce the various hazards that may be caused by improper operation when the coke oven stops heating or resumes heating, thereby ensuring the stable operation and production efficiency of the coke oven.

[0185] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a program, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A way to specify functions in one or more boxes.

[0186] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0187] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0188] In the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0189] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0190] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A start-stop control method for coke oven heating, characterized in that: include: S1. Obtaining parameters related to coke oven heating, including basement gas main pressure, first-class equipment status, second-class equipment status, third-class equipment status, blower status, and coke output status; S2, perform logical judgment on the parameters, and when any of the following conditions is met, execute S3, otherwise, continue heating; Condition 1: The basement gas main pressure is lower than 500Pa and has a downward trend; Condition 2: The status of Class I equipment is damaged; Condition 3: The status of the Class II equipment is a failure; Condition 4: The status of Category 3 equipment is damaged; Condition 5: The blower stops running; Condition 6: The image cannot be out of focus within the preset time; S3, control the coke oven to stop heating; S4. Control the coke oven to resume heating.

2. The start-stop control method for coke oven heating according to claim 1, characterized in that: The first type of equipment status includes whether the gas pipeline and pipe fittings are damaged; the second type of equipment status includes whether the flue system fails; and the third type of equipment status includes whether the exchange system is damaged.

3. The start-stop control method for coke oven heating according to claim 2, characterized in that S3 include: During the period of stopping heating, the coke pushing operation is stopped and the coke oven production is stopped; Close all the exchange cocks in the coke oven basement and stop after the exhaust gas is reversed; Close all the adding and subtracting cocks in the coke oven basement; The gas flow flap is fixed and manually operated to be in the fully open position; When the basement gas main pressure is lower than 200Pa, steam is introduced to maintain the pressure. After the steam is introduced, the release valve of the automatic release water seal is gradually opened while monitoring the main pressure, and the main valve of the gas main is gradually closed; When stopping heating, first cut off the gas and then reduce the suction; When the gas is turned off, reduce the suction of the flue gas ducts on both sides of the coke machine to below 100Pa. If the suction cannot be reduced by adjusting the flaps of the flue gas ducts, adjust the flaps of the main flue gas duct; When heating is stopped for more than half an hour and still not restored, cover the air inlet door, leaving only a gap of 5 mm to 10 mm, so that the suction force at the top of the ascending airflow heat storage chamber is 10Pa greater than normal in coordination with the reduced suction force of the flue gas distribution duct; When an automatic reversing device is installed, place the operating selector in the stop position; When the heating is stopped, if the switching cycle is 20 minutes, the exhaust gas is exchanged every 40 minutes; It is forbidden to place the air cover and the exhaust gas thallium in the middle position; When the heating is stopped, if the basement gas cock blasts or the automatic relief water seal vibrates due to excessive pressure in the gas main, open the relief valve and add water to the automatic relief water seal as appropriate, or close the valve from the gas main to the automatic relief water seal; If an accident occurs in the exchange system, all the adding and subtracting cocks will be closed directly; During the period of stopping heating, the pressure of the coke oven gas collecting pipe is 20Pa to 30Pa higher than normal.

4. The start-stop control method for coke oven heating according to claim 3, characterized in that S4 include: If steam is used to maintain pressure, open the main gas valve first, and gradually close the steam to drive away the steam with gas; When the steam coming out of the vent pipe is less than the threshold, take a sample for gas explosion test. If the test is qualified, close the vent valve; When the gas main pressure is less than 3000Pa, the relief valve will be closed; Restore the exhaust gas inlet door opening of the flue area on the machine and coke sides, and restore the suction of the flue on the machine and coke sides to normal; Open the basement exchange cock; Open the basement add / subtract cocks in batches according to the gas pressure to deliver gas to the combustion chamber; When the adding and subtracting cocks have been partially opened, close the relief valve; Check whether each heating equipment and instrument is in normal working condition; If the heating is stopped due to the switching system inspection or accident, the switch must be tested manually and then electrically before resuming heating. Heating can only be resumed after it is normal; It is forbidden to place the air cover and the exhaust gas thallium in the middle position; It is prohibited to supply gas to multiple coke ovens at the same time; If the heating stop time exceeds the threshold and the vertical fire channel temperature drops below the gas ignition point, first add ignition materials to the vertical fire channel and then supply gas; before supplying gas, sample the standard fire channel and burner temperature; When an automatic reversing device is installed, put the operation selector in the automatic position; Only after the above conditions return to normal can the coking operation be carried out.

5. A start-stop control system dedicated to coke oven heating, characterized in that: include: A parameter acquisition module, which acquires parameters related to coke oven heating, including basement gas main pressure, first-class equipment status, second-class equipment status, third-class equipment status, blower status, and coke output status; The parameter analysis module performs logical judgment on the parameters. When any of the following conditions is met, the start-stop control module is entered; otherwise, heating continues; Condition 1: The basement gas main pressure is lower than 500Pa and has a downward trend; Condition 2: The status of Class I equipment is damaged; Condition 3: The status of the Class II equipment is a failure; Condition 4: The status of Category 3 equipment is damaged; Condition 5: The blower stops running; Condition 6: The image cannot be out of focus within the preset time; Stop the control module to control the coke oven to stop heating; Start the control module to control the coke oven to resume heating.

6. The start-stop control system dedicated to coke oven heating according to claim 5, characterized in that: The first type of equipment status includes whether the gas pipeline and pipe fittings are damaged; the second type of equipment status includes whether the flue system fails; and the third type of equipment status includes whether the exchange system is damaged.

7. The start-stop control system dedicated to coke oven heating according to claim 6, characterized in that: The stop control module includes the following control conditions: During the period of stopping heating, the coke pushing operation is stopped and the coke oven production is stopped; Close all the exchange cocks in the coke oven basement and stop after the exhaust gas is reversed; Close all the adding and subtracting cocks in the coke oven basement; The gas flow flap is fixed and manually operated to be in the fully open position; When the basement gas main pressure is lower than 200Pa, steam is introduced to maintain the pressure. After the steam is introduced, the release valve of the automatic release water seal is gradually opened while monitoring the main pressure, and the main valve of the gas main is gradually closed; When stopping heating, first cut off the gas and then reduce the suction; When the gas is turned off, reduce the suction of the flue gas ducts on both sides of the coke machine to below 100Pa. If the suction cannot be reduced by adjusting the flaps of the flue gas ducts, adjust the flaps of the main flue gas duct; When heating is stopped for more than half an hour and still not restored, cover the air inlet door, leaving only a gap of 5 mm to 10 mm, so that the suction force at the top of the ascending airflow heat storage chamber is 10Pa greater than normal in coordination with the reduced suction force of the flue gas distribution duct; When an automatic reversing device is installed, place the operating selector in the stop position; When the heating is stopped, if the switching cycle is 20 minutes, the exhaust gas is exchanged every 40 minutes; It is forbidden to place the air cover and the exhaust gas thallium in the middle position; When the heating is stopped, if the basement gas cock blasts or the automatic relief water seal vibrates due to excessive pressure in the gas main, open the relief valve and add water to the automatic relief water seal as appropriate, or close the valve from the gas main to the automatic relief water seal; If an accident occurs in the exchange system, all the adding and subtracting cocks will be closed directly; During the period of stopping heating, the pressure of the coke oven gas collecting pipe is 20Pa to 30Pa higher than normal.

8. The start-stop control system dedicated to coke oven heating according to claim 1, characterized in that: The startup control module includes the following control conditions: If steam is used to maintain pressure, open the main gas valve first, and gradually close the steam to drive away the steam with gas; When the steam coming out of the vent pipe is less than the threshold, take a sample for gas explosion test. If the test is qualified, close the vent valve; When the gas main pressure is less than 3000Pa, the relief valve will be closed; Restore the exhaust gas inlet door opening of the flue area on the machine and coke sides, and restore the suction of the flue on the machine and coke sides to normal; Open the basement exchange cock; Open the basement add / subtract cocks in batches according to the gas pressure to deliver gas to the combustion chamber; When the adding and subtracting cocks have been partially opened, close the relief valve; Check whether each heating equipment and instrument is in normal working condition; If the heating is stopped due to the switching system inspection or accident, the switch must be tested manually and then electrically before resuming heating. Heating can only be resumed after it is normal; It is forbidden to place the air cover and the exhaust gas thallium in the middle position; It is prohibited to supply gas to multiple coke ovens at the same time; If the heating stop time exceeds the threshold and the vertical fire channel temperature drops below the gas ignition point, first add ignition materials to the vertical fire channel and then supply gas; before supplying gas, sample the standard fire channel and burner temperature; When an automatic reversing device is installed, put the operation selector in the automatic position; Only after the above conditions return to normal can the coking operation be carried out.

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