Red coke oven drying and production control method after annual repair of large dry quenching furnace

Abstract

The invention relates to a red coke oven drying and production control method after annual repair of a large dry quenching furnace, which comprises the following steps: a warm air drying stage: introducing steam into a steam drum to increase the temperature of the steam drum, discharging to a boiler blow-off point to increase the temperature of the boiler, and gradually increasing the inlet temperature of the dry quenching furnace through a gas circulation system; in the red coke oven drying stage, red coke is intermittently put into the dry quenching oven cooling chamber for oven drying; the material level is confirmed regularly, the control range of the material level is determined according to the temperature rise amplitude of the temperature of the pre-storage chamber, the coke feeding amount and the coke discharging amount are checked, the distribution situation of red coke in the dry quenching furnace is fed back in time, and the opening degree proportion of an inlet baffle of the dry quenching furnace is adjusted; in the red coke feeding and temperature rising period, the upper temperature of the cooling chamber, the lower temperature of the cooling chamber, the inlet temperature of the boiler, the relief valve pressure of the pre-storage chamber, the pressure of the boiler and air introduction are managed. According to the method, moisture of new and old brickwork after annual repair of the large dry quenching furnace is efficiently removed, and unsafe factors in the gas furnace baking process are effectively eradicated.

Description

Technical Field

[0001] The invention relates to the field of metallurgical coking, and in particular to a red coke baking furnace and a production control method after annual maintenance of a large-scale dry quenching furnace. Background Art

[0002] The primary task of drying the furnace is to remove moisture from the refractory materials in the dry quenching furnace body, and at the same time heat the furnace body to a temperature suitable for normal production. Before the dry quenching coke was put into production, the traditional process used warm air drying + gas drying furnace to dry the dry quenching furnace. After practice, the industry gradually explored and practiced the "warm air drying + red coke drying furnace" process for the dry quenching furnace, and achieved the effect of gas drying furnace. In view of the fact that the red coke drying furnace shortened the drying cycle and saved gas costs, this drying furnace process has been widely promoted in the industry. The red coke drying furnace eliminates unsafe factors in the gas drying process, and the steam and dry quenching coke generated by the early production of the dry quenching furnace after the annual maintenance have good economic benefits.

[0003] Document CN 107201237 B discloses a method for heating up a drying furnace for resuming production after a dry quenching furnace is repaired, including: loading cold coke into the dry quenching furnace after the dry quenching furnace is repaired; after the dry quenching furnace is inspected for air tightness, 90℃-120℃ air is introduced into the dry quenching furnace for warm air drying; when the inlet temperature of the dry quenching furnace rises to 120℃, red coke is loaded into the dry quenching furnace in a manual coke loading mode; when the temperature of the pre-storage section of the dry quenching furnace reaches 500℃, a charging bell is installed, and when the coke level in the dry quenching furnace is higher than the elevation of the chute bracket, red coke is loaded in the central automatic coke loading mode of the dry quenching furnace. The disclosed method is suitable for repairs in which the pre-storage section of the dry quenching furnace is replaced with bricks and the cooling section is not repaired. It is used to reduce the time for resuming production after a dry quenching furnace with a processing capacity of 140t / h from the conventional 17 days to 7 days, and reduce the amount of coke oven gas used for gas oven drying by about 210,000 cubic meters. However, it is unknown for the use of large dry quenching furnaces after annual repairs.

[0004] Based on this, there is room for improvement in the post-annual maintenance and baking of large CDQ furnaces. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a red coke baking and production control method for a large-scale CDQ furnace after annual maintenance, so as to solve the gas unsafe factors in the baking process of the new and old masonry of the existing CDQ furnace.

[0006] In order to achieve the above object, the technical solution provided by the present invention is: A method for controlling the production of a large-scale dry quenching furnace after annual maintenance of a red coke baking furnace, comprising: In the warm air drying stage, the drum temperature is increased by passing steam into the drum, the boiler temperature is increased by discharging the boiler blowdown point, and the CDQ furnace inlet temperature is gradually increased through the gas circulation system; During the red coke baking stage, red coke is intermittently added to the CDQ furnace cooling chamber for baking; the baking furnace material level is controlled in the cooling section, the pre-storage chamber temperature and the upper temperature of the cooling chamber are managed, and three constant temperature sections of the pre-storage chamber temperature are set; the material level is confirmed regularly, and the material level control range is determined according to the temperature increase of the pre-storage chamber temperature, and the coke input and coke discharge amounts are verified, and the distribution of red coke in the CDQ furnace is fed back in time and the opening ratio of the CDQ furnace inlet damper is adjusted; during the red coke heating period, the upper temperature of the cooling chamber, the lower temperature of the cooling chamber, the boiler inlet temperature, the pre-storage chamber relief valve pressure, the boiler pressure, and the air introduction are managed; during the red coke heating period, the pre-storage chamber temperature, the upper temperature of the cooling chamber, the lower temperature of the cooling chamber, and the boiler inlet temperature are controlled by controlling the coke input, the red coke input frequency, and the coke discharge amount; During the warm air drying stage, drainage management is carried out, including testing the drainage volume of the steel plate inner wall of the CDQ furnace protection wall, the primary dust collector, the secondary dust collector, the dust exhaust pipe and the rotary sealing valve of the coke exhaust device. When the drainage volume is close to zero, the warm air drying is completed; The expansion volume management is carried out during the CDQ furnace baking period, including measuring the expansion volume of each unit equipment in the CDQ furnace system and taking abnormal response measures when the expansion volume is abnormal.

[0007] In some embodiments, the warm air drying stage includes the following operations: heating the pipes with low-pressure steam; controlling the drum liquid level; controlling the flow rate of the boiler's forced circulation pump; preparing chemicals for boiler dosing; confirming that each valve in the boiler system is in a normal open and closed state; starting the circulating fan, adjusting the air volume of the circulating fan, and adjusting the opening of the dry quenching furnace inlet flap; and opening the low-pressure steam valve for heating operations.

[0008] In some embodiments, the operation of the heating operation in the warm air drying stage includes: when the temperature of the pre-storage chamber rises too quickly, the low-pressure steam blowing amount, the circulating fan air volume, the imported air volume, the opening of the furnace cover and their combinations can be reduced; when the temperature of the pre-storage chamber rises slowly, the low-pressure steam blowing amount, the reduced imported air volume and their combinations can be increased; when the boiler water temperature rises but the circulating gas temperature does not rise, the imported air volume can be reduced; when the pre-storage chamber temperature rises too quickly and the circulating gas temperature rises too quickly, the discharged air volume, the imported air volume and their combinations can be increased; when the temperature difference between the dry quenching furnace inlet temperature and the pre-storage chamber temperature becomes larger, if the circulating gas temperature is greater than the pre-storage chamber temperature, the air volume of the circulating fan is increased.

[0009] In some embodiments, the adjustment items and benchmarks of the warm air drying stage include: boiler heating rate, 48°C / h~52°C / h; heating rate of the dry quenching furnace inlet temperature, 10°C / h~20°C / h, and the dry quenching furnace inlet temperature is maintained at 160°C~170°C; drum liquid level, 0mm~100mm; boiler water quality, pH8.5~9.5, conductivity 590μs / cm~610μs / cm, SiO2<20ppm; pre-storage chamber pressure, 0Pa~50Pa; the amount of air introduced, gradually increases according to the temperature rise situation; the air volume of the circulating fan, gradually increases according to the temperature rise situation.

[0010] In some embodiments, the boiler heating measures include controlling the boiler liquid level through continuous discharge and fixed discharge, and adjusting the opening of the drum vent valve at any time as the boiler inlet temperature rises: when the drum pressure reaches 0.2MPa, the drum vent valve is closed; when the drum pressure reaches 0.3MPa, the primary superheater vent valve and the secondary superheater vent valve are closed, and the steam trap is slightly opened; when the drum pressure reaches 0.3MPa, the membrane water-cooled wall header, economizer and boiler drum are regularly discharged.

[0011] In some embodiments, the red coke baking stage includes confirming that the process conditions for adding red coke are met: the top vent valve of the dry quenching furnace is cut off, the flue gas is introduced into the dry quenching furnace for desulfurization and denitrification and operates normally, the air inlet valve is fully closed, and the oxygen content in the dry quenching furnace is <5%; the center of the fan outlet of the circulating gas system is opened by 46% to 54%, and the periphery is opened by 46% to 54%; the top water seal groove, the primary dust removal water seal groove, and the emergency vent valve water seal groove are all filled with water; confirm that the boiler system's boiler feed water pump, deoxygenation feed water pump, forced circulation water pump, system drain, and sewage valve are normal.

[0012] In some embodiments, the red coke feeding and heating measures in the red coke baking stage include: intermittently feeding red coke into the cooling chamber of the dry quenching furnace for baking; circulating inert gas in the circulating gas channel composed of the dry quenching furnace, the primary dust collector, the boiler, the economizer and the secondary dust collector through a circulating fan; controlling the baking furnace material level in the cooling section, managing the pre-storage chamber temperature and the upper temperature of the cooling chamber, determining the interval time for feeding red coke, and setting three constant temperature sections of the pre-storage chamber temperature; maintaining regular manual confirmation of the material level, determining the material level control range according to the temperature increase of the pre-storage chamber temperature and verifying the coke feeding and coke discharge amount; and timely feedback. The distribution of red coke fed in the CDQ furnace is checked, and the opening ratio of the damper at the CDQ furnace entrance is adjusted; during the heating period of red coke fed, the upper temperature of the cooling chamber, the lower temperature of the cooling chamber, the boiler inlet temperature, the pressure of the pre-storage chamber relief valve, the boiler pressure, and the air introduction are managed; when the boiler inlet temperature exceeds the first temperature, the boiler feed water pump is started to continuously add water, the drum liquid level is controlled by adjusting the drain or the water discharge, and the dosing water pump is enabled to add chemicals to the boiler water; when the boiler inlet temperature reaches the second temperature but the drying furnace material level has not passed the ramp area, air introduction is strictly prohibited, and air introduction can only be carried out after the drying furnace material level has passed the ramp area and stabilized.

[0013] In some embodiments, when the material level of the drying furnace is controlled in the cooling section, the temperature rise rate of the pre-storage chamber is controlled at 9°C / h to 11°C / h, the upper temperature of the cooling chamber is used to determine the interval time of adding red coke, and the pre-storage chamber temperature is set to 105°C to 115°C, 155°C to 165°C and 395°C to 405°C. During the heating period of adding red coke, management is as follows: the upper temperature of the cooling chamber is ≤450°C, the temperature rise rate of the upper temperature of the cooling chamber is ≤15°C / h, the lower temperature of the cooling chamber is ≤350°C, the temperature rise rate of the lower temperature of the cooling chamber is ≤15°C / h, the pre-storage chamber relief valve pressure is -50Pa to +50Pa, and the boiler pressure fluctuation is strictly prohibited to exceed 0.3MPa per hour. The first temperature is 300°C and the second temperature is 650°C.

[0014] In some embodiments, the operation of heating up the temperature of the red coke in the red coke oven stage includes: an initial stage, in which cold coke is added; a first temperature range stage, in which the frequency of adding red coke is determined according to the temperature rise situation; a coke discharge stage, in which the red coke is slowly discharged after a certain number of furnaces are added, and the oven material level is kept at a predetermined position in the cooling chamber according to the consistency between the amount of coke added and the amount of coke discharged; a first heat preservation stage, in which the temperature is maintained for a first time after reaching a first set temperature, and then the temperature is continued to rise; a second temperature range stage, in which the frequency of adding red coke is adjusted and the amount of red coke is verified according to the temperature rise situation, and before the oven material level reaches the lower end of the ramp, the boiler inlet temperature, the lower temperature of the cooling chamber, and the upper temperature of the cooling chamber are managed. degree; the second insulation stage, after reaching the second set temperature, maintain the second time, and then continue to heat up; in the third temperature range stage, after exceeding the third set temperature, raise the drying furnace material level to above the upper inclined road mouth, add red coke at intervals according to the temperature rise situation, and control the boiler inlet temperature by adjusting the circulating fan speed. The interval time of adding red coke can be appropriately adjusted according to the pre-storage chamber temperature of the dry quenching furnace, the lower temperature of the cooling chamber, the upper temperature of the cooling chamber and the boiler inlet temperature, and then adjust the frequency of adding red coke. When the pre-storage chamber temperature and the boiler inlet temperature both exceed the fourth set temperature, the drying furnace material level can be gradually raised to the normal production level and organized according to normal production.

[0015] In some embodiments, the first temperature range is 100℃~160℃, the first set temperature is 160℃, the first time is at least 24 hours, the second temperature range is 160℃~400℃, the second set temperature is 400℃, the second time is at least 24 hours, the third temperature range is over 650℃, the third set temperature is 650℃, and the fourth set temperature is 800℃.

[0016] The beneficial effects of the present invention are: The red coke baking and production control method of a large-scale dry quenching furnace after annual maintenance of the present invention adopts warm air drying and red coke baking to efficiently remove moisture from new and old masonry after annual maintenance of the large-scale dry quenching furnace, effectively eliminate unsafe factors in the process of gas baking, and the steam and dry quenching coke generated by early production of the large-scale dry quenching furnace after annual maintenance have good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A warm air drying gas circulation diagram of a red coke baking furnace and a production control method for a large CDQ furnace after annual maintenance provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0021] The large-scale dry quenching furnace after annual repair and the control method for putting into production of red coke baking furnace of the present invention comprises: In the warm air drying stage, the drum temperature is increased by introducing steam into the drum, the boiler temperature is increased by discharging the boiler wastewater, and the CDQ furnace inlet temperature T2 is gradually increased through the gas circulation system; During the red coke baking stage, red coke is intermittently added into the cooling chamber of the CDQ furnace for baking; the baking furnace material level is controlled in the cooling section, the pre-storage chamber temperature T5 and the upper temperature of the cooling chamber T4 are managed, and three constant temperature sections of the pre-storage chamber temperature T5 are set; the material level is confirmed regularly, and the control range of the material level is determined according to the temperature increase amplitude of the pre-storage chamber temperature T5, and the coke input and discharge amounts are verified, and the distribution of red coke in the CDQ furnace is fed back in time and the opening ratio of the CDQ furnace inlet damper is adjusted; during the heating period of red coke, the upper temperature T4 of the cooling chamber, the lower temperature T3 of the cooling chamber, the boiler inlet temperature T6, the pre-storage chamber relief valve pressure, the boiler pressure, and the air introduction are managed; during the heating period of red coke, the pre-storage chamber temperature T5, the upper temperature T4 of the cooling chamber, the lower temperature T3 of the cooling chamber, and the boiler inlet temperature T6 are controlled by controlling the coke input, the frequency of red coke input, and the discharge amount.

[0022] In some embodiments, the warm air drying stage includes the following preliminary preparations: completion of the main engineering construction, completion of the test run of the relevant systems, confirmation that the equipment system maintenance project is ready for commencement, completion of the equipment unit test run and the linkage test run and commissioning of each process, installation of the air introduction adjustment plate; loading cold coke through the oven hole on the oven platform side until the cold coke completely covers the hood of the air supply device and the lining plate on the cone bucket wall; after the cold coke is loaded, near the lower edge of the square manhole; the oven hole cover is sealed on the oven platform side. The relevant systems include hoists, coke tanks, loading devices, coke discharge systems, and boilers.

[0023] In some embodiments, the warm air drying stage includes the following operations: heating the pipes with low-pressure steam; controlling the drum liquid level; controlling the flow rate of the boiler forced circulation pump; preparing the chemicals used for boiler dosing; confirming that the valves of the boiler system are in a normal open and closed state; starting the circulation fan, adjusting the air volume of the circulation fan, and adjusting the opening of the CDQ furnace inlet flap; opening the low-pressure steam valve for heating. The CDQ furnace inlet flap includes a central air duct inlet flap and a ring air duct inlet flap.

[0024] In some embodiments, the chemicals used for boiler dosing include dimethyl ketoxime and trisodium phosphate.

[0025] In some embodiments, the air circulation during the warm air drying stage is as follows: Figure 1 As shown, low-pressure steam is introduced into the steam drum of the boiler to heat the boiler, and air enters the boiler through the emergency relief valve. The air is heated by heat exchange between the boiler and the air. The heated air undergoes secondary dust removal and then enters the heat pipe heat exchanger through the circulating fan, and then enters the dry quenching furnace for warm air drying, and finally is discharged into the atmosphere through the relief valve on the top of the furnace.

[0026] In some embodiments, the adjustment items and benchmarks of the warm air drying stage include: boiler heating rate, 48°C / h~52°C / h; heating rate of the dry quenching furnace inlet temperature T2, 10°C / h~20°C / h, and the dry quenching furnace inlet temperature T2 is maintained at 160°C~170°C; drum liquid level, 0mm~100mm; boiler water quality, pH8.5~9.5, conductivity 590μs / cm~610μs / cm, SiO2<20ppm; pre-storage chamber pressure, 0Pa~50Pa; the amount of air introduced, gradually increases according to the temperature rise situation; the air volume of the circulating fan, gradually increases according to the temperature rise situation.

[0027] In some embodiments, the management temperature of the warm air drying stage includes the dry quenching furnace inlet temperature T2 and the pre-storage chamber temperature T5. The temperature rise rate of the dry quenching furnace inlet temperature T2 is controlled to be 10°C / h to 20°C / h. When the dry quenching furnace inlet temperature T2 reaches 160°C to 170°C, it is maintained until the pre-storage chamber temperature T5 reaches 110°C, and the warm air drying stage is ended.

[0028] In some embodiments, the boiler heating measures include controlling the boiler liquid level through continuous and fixed discharge, and adjusting the opening of the drum vent valve at any time as the boiler inlet temperature T6 rises: when the drum pressure reaches 0.2MPa, close the drum vent valve; when the drum pressure reaches 0.3MPa, close the primary superheater vent valve and the secondary superheater vent valve, and slightly open the steam trap; when the drum pressure reaches 0.3MPa, the membrane water-cooled wall header, economizer and boiler drum are regularly discharged. In the warm air drying stage, the drum heating rate should be controlled below 30℃ / h, and the low-pressure steam can be closed when the drum temperature is consistent with the low-pressure steam temperature.

[0029] In some embodiments, the operation of the heating operation in the warm air drying stage includes: when the pre-storage chamber temperature T5 rises too quickly, the low-pressure steam blowing amount, the circulating fan air volume, the imported air volume, the opening of the furnace cover and their combinations can be reduced; when the pre-storage chamber temperature T5 rises slowly, the low-pressure steam blowing amount, the reduced imported air volume and their combinations can be increased; when the boiler water temperature rises but the circulating gas temperature does not rise, the imported air volume can be reduced; when the pre-storage chamber temperature T5 rises too quickly and the circulating gas temperature rises too quickly, the discharged air volume, the imported air volume and their combinations can be increased; when the temperature difference between the dry quenching furnace inlet temperature T2 and the pre-storage chamber temperature T5 becomes larger, if the circulating gas temperature is greater than the pre-storage chamber temperature T5, the air volume of the circulating fan is increased.

[0030] In some embodiments, the regulation measures for the temperature increase operation in the warm air drying stage include: the amount of low-pressure steam blown in, the amount of introduced air, the amount of circulating gas, the opening of the furnace cover, the adjustment of the system pressure and their combination.

[0031] After the CDQ system is constructed, a large amount of water is stored in the refractory bricks, castables, mortar, fiber felt and cold coke. After the warm air drying begins, the temperature of the CDQ system rises, and the water evaporates from the materials of the refractory bricks, castables, mortar, fiber felt and cold coke. At the same time, water accumulates in the steel plate inner wall of the CDQ protective wall, the primary dust collector, the secondary dust collector, the dust exhaust pipe and the rotary sealing valve of the coke discharge device. If these accumulated water are not discharged as soon as possible, the CDQ protective wall, the rotary sealing valve of the coke discharge device and the flat gate will be corroded. The water in the CDQ furnace wall will have a destructive effect on the mortar and refractory bricks, and the coke powder will solidify and block the equipment after entering the primary dust collector, the secondary dust collector, the dust exhaust pipe and other parts. The water in the refractory bricks, castables, mortar, fiber felt and cold coke needs to be discharged during the warm air drying stage.

[0032] In some embodiments, drainage management is performed during the warm air drying stage, including detecting the drainage amount of the steel plate inner wall of the dry quenching furnace protective wall, the primary dust collector, the secondary dust collector, the dust exhaust pipe, and the rotary sealing valve of the coke exhaust device. When the drainage amount is close to zero, the warm air drying ends. During the warm air drying stage, as the temperature of the warm air drying continues to rise, the drainage amount of each part will increase, and the corresponding drainage frequency will also increase. When the drainage amount gradually decreases, the drainage frequency can be appropriately reduced until the warm air drying ends.

[0033] In some embodiments, the red coke baking stage includes confirming that the process conditions for adding red coke are met: the top vent valve of the dry quenching furnace is cut off, the flue gas is introduced into the dry quenching furnace for desulfurization and denitrification and operates normally, the air inlet valve is fully closed, and the oxygen content in the dry quenching furnace is <5%; the center of the fan outlet of the circulating gas system is opened by 46% to 54%, and the periphery is opened by 46% to 54%; the top water seal groove, the primary dust removal water seal groove, and the emergency vent valve water seal groove are all filled with water; confirm that the boiler system's boiler feed water pump, deoxygenation feed water pump, forced circulation water pump, system drain, and sewage valve are normal.

[0034] In some embodiments, the red coke feeding and heating measures in the red coke baking stage include: intermittently feeding red coke into the cooling chamber of the dry quenching furnace for baking; circulating inert gas in the circulating gas channel composed of the dry quenching furnace, the primary dust collector, the boiler, the economizer and the secondary dust collector through a circulating fan; controlling the baking furnace material level in the cooling section, managing the pre-storage chamber temperature T5 and the upper temperature T4 of the cooling chamber, determining the interval time of feeding red coke, and setting three constant temperature sections of the pre-storage chamber temperature T5; maintaining a timed manual confirmation of the material level, according to The temperature rise range of the pre-storage chamber temperature T5 determines the control range of the material level and verifies the coke input and discharge amount; timely feedback on the distribution of red coke in the CDQ furnace, and adjust the opening ratio of the CDQ furnace inlet damper; during the heating period of red coke, manage the upper temperature of the cooling chamber T4, the lower temperature of the cooling chamber T3, the boiler inlet temperature T6, the pre-storage chamber relief valve pressure, the boiler pressure, and the air introduction; when the boiler inlet temperature T6 exceeds 300℃, start the boiler feed water pump to continuously add water, and control the drum liquid level by adjusting the discharge or drainage. Enable the dosing water pump of dimethyl ketoxime and trisodium phosphate to add medicine to the boiler water; when the boiler inlet temperature T6 reaches 650℃ but the drying furnace material level has not passed the ramp area, it is strictly forbidden to use air introduction. Air introduction can only be carried out after the drying furnace material level passes the ramp area and stabilizes.

[0035] In some embodiments, when the material level of the baking furnace is controlled in the cooling stage, the temperature rise rate of the pre-storage chamber temperature T5 is controlled at 9°C / h to 11°C / h, the upper temperature T4 of the cooling chamber is used to determine the interval time of adding red coke, and the pre-storage chamber temperature T5 is set to three constant temperature stages of 105°C to 115°C, 155°C to 165°C, and 395°C to 405°C. The pre-storage chamber temperature T5 is the main management temperature of the red coke baking furnace.

[0036] In some embodiments, during the heating period of red coke, management is performed such as: the upper temperature T4 of the cooling chamber ≤450°C, and the heating rate of the upper temperature T4 of the cooling chamber ≤15°C / h; the lower temperature T3 of the cooling chamber ≤350°C, and the heating rate of the lower temperature T3 of the cooling chamber ≤15°C / h; the pressure of the pre-storage chamber relief valve is -50Pa~+50Pa, and the boiler pressure fluctuation is strictly prohibited to exceed 0.3MPa per hour.

[0037] In some embodiments, the red coke feeding and heating operations in the red coke baking stage include: an initial stage, in which cold coke is fed; a first temperature range stage, in which the frequency of feeding red coke is determined according to the temperature rise situation; a coke discharge stage, in which red coke is fed into a certain number of furnaces and then the coke is slowly discharged, and the baking furnace material level is maintained at a predetermined position in the cooling chamber according to the consistency of the coke feeding amount and the coke discharge amount; a first insulation stage, in which the first set temperature is reached and maintained for a first time, and then the temperature is continued to be raised; a second temperature range stage, in which the frequency of feeding red coke is adjusted and the amount of red coke is verified according to the temperature rise situation, and before the baking furnace material level reaches the lower mouth of the ramp, the boiler inlet temperature T6, the lower temperature of the cooling chamber T3, and the upper temperature of the cooling chamber T4 are managed; a second insulation stage, in which the second set temperature is reached and maintained for a second time, and then the temperature is continued to be raised; a third temperature range stage, in which the baking furnace material level is raised to above the upper ramp mouth after exceeding the third set temperature, and red coke is fed at intervals according to the temperature rise situation, and the boiler inlet temperature T6 is controlled by adjusting the speed of the circulating fan. The interval time of adding red coke can be appropriately adjusted according to the pre-storage chamber temperature T5, the lower temperature of the cooling chamber T3, the upper temperature of the cooling chamber T4 and the boiler inlet temperature T6 of the dry quenching furnace, and then the frequency of adding red coke can be adjusted. When the pre-storage chamber temperature T5 and the boiler inlet temperature T6 both exceed the fourth set temperature, the drying furnace material level can be gradually raised to the normal production material level and organized according to normal production.

[0038] In some embodiments, the first temperature range is 100℃~160℃, the first set temperature is 160℃, the first time is at least 24 hours, the second temperature range is 160℃~400℃, the second set temperature is 400℃, the second time is at least 24 hours, the third temperature range is over 650℃, the third set temperature is 650℃, and the fourth set temperature is 800℃.

[0039] During the dry quenching furnace, as the drying process progresses, the temperature of the entire dry quenching furnace system gradually rises, and the expansion of each unit equipment in the dry quenching furnace system gradually increases. In order to prevent damage to the unit equipment caused by excessive expansion, in addition to strictly controlling the heating rate, it is necessary to regularly measure the expansion of each unit equipment. The expansion of the unit equipment in the dry quenching furnace system should be measured at least once a day.

[0040] In some embodiments, expansion management is performed during the dry quenching furnace baking period, including measuring the expansion of each unit device of the dry quenching furnace system and taking abnormal response measures when the expansion is abnormal. The expansion measurement points of the unit devices of the dry quenching furnace system include the dry quenching furnace outlet expansion joint, the boiler inlet expansion joint, the boiler outlet expansion joint, the secondary dust collector inlet, the secondary dust collector outlet, the circulating fan outlet and the feed water preheater.

[0041] In some embodiments, if there is an abnormality in the expansion measurement value, the number of measurements of the expansion measurement point of the single device corresponding to the abnormal expansion measurement value is increased, and abnormal response measures are taken to handle it. The abnormal response measures include adjusting the heating rate of the single device and inspecting and processing the installation structure of the single device.

[0042] In some embodiments, the expansion amount of the CDQ furnace unit device is measured manually using a ruler, a steel measuring tape, chalk, and other tools.

[0043] The red coke drying furnace and production control method of the large-scale dry quenching furnace after annual repair of the present invention is used after the existing large-scale dry quenching furnace is repaired. The existing large-scale dry quenching furnace refers to a dry quenching furnace with a processing capacity of more than 190t / h dry quenching coke. The annual repair mainly repairs the parts including the bracket, the cooling chamber, and the pre-storage chamber. The method of the present invention is used as follows: 1. Warm air drying 1. Preliminary preparations The main construction project is completed, and the hoist, coke tank, loading device, coke discharge system, boiler and other systems have completed the test run, confirming that the equipment system maintenance project is ready for start-up. Complete the equipment single test run, complete the linkage test run and debugging of each process. Install the air introduction adjustment plate for warm air drying, with a size of 3mm×200mm×1500mm; Load the cold coke through the oven hole on the oven platform side until the cold coke completely covers the hood of the air supply device and the lining plate on the cone bucket wall. After the cold coke is loaded, the cold coke is near the lower edge of the square manhole. This part of the cold coke can be loaded manually by using a mobile loading belt conveyor or a loading hopper with a temporary loading chute. When the cold coke covers the hood of the air supply device, the elevator is ready to load the cold coke; The oven hole cover seals the oven hole on the oven platform side; Among them, about 350 tons of cold coke are needed for the cold coke loading and cold coke discharge tests.

[0044] 2. Warm air drying stage The drum temperature is increased by passing low-pressure steam into the drum, the boiler temperature is increased by gradually heating the boiler by discharging the boiler blowdown point, and the CDQ furnace inlet temperature T2 is gradually increased through the gas circulation system. Medium-pressure steam can also be used instead of low-pressure steam.

[0045] The warm air drying stage includes the following operations: heating the pipes with low-pressure steam; controlling the drum liquid level; controlling the flow rate of the boiler forced circulation pump to 70% to 75% of the flow rate of the boiler forced circulation pump when the CDQ furnace is in normal production, where the flow rate of the boiler forced circulation pump is set to 420t / h when the CDQ furnace is in normal production; preparing the chemicals used for boiler dosing, including dimethyl ketoxime and trisodium phosphate; confirming that the valves of the boiler system are in a normal open and closed state; starting the circulation fan, and the air volume of the circulation fan is 36000m 3 / h, after the circulating fan is started, gradually fully open the inlet damper of the circulating fan, and use the speed of the circulating fan to adjust the air volume of the circulating fan. Manually adjust the opening of the CDQ furnace inlet flap to ensure uniform distribution of airflow through the coke layer in the CDQ furnace. Generally, open the central air duct inlet flap by 60%, and the annular air duct inlet flap by 50% to 60%; open the low-pressure steam valve, blow in low-pressure steam for heating operation, and gradually open the low-pressure steam valve according to the heating requirements.

[0046] The adjustment items and benchmarks of the warm air drying stage include: boiler heating rate, based on the boiler water temperature, 50℃ / h; heating rate of the dry quenching furnace inlet temperature T2, 10℃ / h~20℃ / h, and the dry quenching furnace inlet temperature T2 is maintained at 160℃; drum liquid level, 0mm~100mm; boiler water quality, pH8.5~9.5, conductivity 600μs / cm, SiO2<20ppm; pre-storage chamber pressure, 0Pa~50Pa; the amount of air introduced, gradually increased according to the heating situation; the air volume of the circulating fan, gradually increased according to the heating situation. The warm air drying stage uses the dry quenching furnace inlet temperature T2 as the main management temperature, and the heating rate of the dry quenching furnace inlet temperature T2 is controlled to 10℃ / h, and the dry quenching furnace inlet temperature T2 is maintained at 160℃ until the pre-storage chamber temperature T5 reaches 110℃, ending the warm air drying stage. The operation time of warm air drying from start to finish is 3 days.

[0047] Among them, the boiler temperature rise is related to the boiler pressure rise. The boiler temperature rise measures include controlling the boiler liquid level through continuous discharge and fixed discharge, and adjusting the opening of the drum vent valve at any time as the boiler inlet temperature T6 rises: when the drum pressure reaches 0.2MPa, close the drum vent valve; when the drum pressure reaches 0.3MPa, close the primary superheater vent valve and the secondary superheater vent valve, and slightly open the steam trap; when the drum pressure reaches 0.3MPa, the membrane water-cooled wall header, economizer and boiler drum are regularly discharged. During the warm air drying stage, the drum temperature rise rate should be controlled below 30℃ / h. When the drum temperature is consistent with the low-pressure steam temperature, the low-pressure steam can be closed. In order to ensure the smooth heating of the boiler, the operation of boiler heating must be strictly carried out according to the temperature rise and pressure rise curve.

[0048] The regulating measures for the heating operation in the warm air drying stage mainly include: the amount of low-pressure steam blown in, the amount of introduced air, the amount of circulating gas, the opening of the furnace cover, the adjustment of the system pressure and their combination.

[0049] The operation of the heating operation includes: when the pre-storage chamber temperature T5 rises too quickly, you can take measures such as reducing the amount of low-pressure steam blown in, increasing the air volume of the circulating fan, increasing the amount of introduced air, increasing the opening of the furnace cover, and a combination thereof; when the pre-storage chamber temperature T5 rises slowly, you can take measures such as increasing the amount of low-pressure steam blown in, reducing the amount of introduced air, and a combination thereof; when the boiler water temperature rises but the circulating gas temperature does not rise, you can take measures such as reducing the amount of introduced air; when the pre-storage chamber temperature T5 rises too quickly and the circulating gas temperature rises too quickly, you can take measures such as increasing the amount of discharged air, increasing the amount of introduced air, and a combination thereof; when the temperature difference between the dry quenching furnace inlet temperature T2 and the pre-storage chamber temperature T5 becomes larger, if the circulating gas temperature is greater than the pre-storage chamber temperature T5, then increase the air volume of the circulating fan.

[0050] During the warm air drying stage, the accumulated water in the steel plate inner wall of the dry quenching furnace protective wall, the primary dust collector, the secondary dust collector, the dust exhaust pipe and the rotary sealing valve of the coke discharge device is drained. As the warm air drying continues to heat up, the drainage frequency of the above-mentioned parts will be increased or decreased according to the drainage amount of the corresponding parts. When the drainage amount of each part is close to zero, the warm air drying is completed.

[0051] 2. Red coke oven Confirm that the process conditions for adding red coke are met: the top vent valve of the CDQ furnace is cut off, the flue gas is introduced into the CDQ furnace for desulfurization and denitrification and operates normally, the air inlet valve is fully closed, and the oxygen content in the CDQ furnace is <5%; the center of the circulating gas system's fan outlet is opened 50% and the periphery is opened 50%, the top water seal groove, primary dust removal water seal groove, and emergency vent valve water seal groove are all filled with water; confirm that the boiler system's boiler feed water pump, deoxygenation feed water pump, forced circulation water pump, system drain, and sewage valve are normal.

[0052] The heating measures for adding red coke include: intermittently adding red coke into the cooling chamber of the dry quenching furnace for drying; during the red coke drying stage, the inert gas with nitrogen as the main component circulates in the circulating gas channel composed of the dry quenching furnace, the primary dust collector, the boiler, the economizer and the secondary dust collector under the suction of the circulating fan; the drying furnace material level is controlled in the cooling section, and the pre-storage chamber temperature T5 is mainly managed, and the heating rate of the pre-storage chamber temperature T5 is controlled at 10℃ / h. The upper temperature T4 of the cooling chamber is assisted to be managed. The upper temperature T4 of the cooling chamber is used to determine the interval time of adding red coke. During the red coke drying stage, the pre-storage chamber temperature T5 is set at 110℃, 160℃ and 400℃. The material level is manually confirmed once every hour, and the control range of the material level is determined according to the temperature increase of the pre-storage chamber temperature T5, and the amount of coke added and the amount of coke discharged are verified to avoid affecting the heating rate of the pre-storage chamber temperature T5. If the heating rate of the pre-storage chamber temperature T5 is too high, it will affect the service life of the bracket. Provide timely feedback on the distribution of red coke in the CDQ furnace, and adjust the opening ratio of the CDQ furnace inlet damper; during the heating period of red coke, manage the upper temperature of the cooling chamber T4≤450℃, the heating rate of the upper temperature of the cooling chamber T4≤15℃ / h, manage the lower temperature of the cooling chamber T3≤350℃, the heating rate of the lower temperature of the cooling chamber T3≤15℃ / h; during the heating period of red coke, manage the pre-storage chamber relief valve pressure -50Pa~+50Pa. The boiler pressure gradually increases with the increase of temperature, and the hourly fluctuation is strictly prohibited to exceed 0.3MPa; when the boiler inlet temperature T6 exceeds 300℃, start the boiler feed pump to continuously add water, and control the drum liquid level by adjusting the drain or drain. Activate the dosing water pumps for dimethyl ketoxime and trisodium phosphate to add chemicals to the boiler water; when the boiler inlet temperature T6 reaches 650℃ but the drying furnace material level has not passed the ramp area, air introduction is strictly prohibited due to large temperature fluctuations. Air introduction can only be carried out when the boiler inlet temperature T6 exceeds 650℃, the drying furnace material level has passed the ramp area and is stable.

[0053] The heating operation of red coke includes: About 5 tons of cold coke are put into the coke tank truck, and the remaining cold coke in the coke tank is taken to the coke tank and put into the CDQ furnace as notified; cold coke refers to coke at room temperature.

[0054] At the temperature stage of 100℃~160℃, the frequency of adding red coke is determined according to the temperature rise situation. It is initially determined to add red coke once every 20 minutes. The principle of adding red coke is to add each can of red coke into the CDQ furnace 2-3 times; After the red coke is put into the 10th furnace, the coke is slowly discharged. According to the consistency between the coke input and the coke discharge, the furnace material level is kept at the predetermined position in the cooling chamber; After the temperature reaches 160°C, maintain it for 24 hours and then continue to increase the temperature; At the temperature stage of 160℃~400℃, adjust the frequency of adding red coke according to the temperature rise situation and determine the amount of red coke to be about 10 tons, initially setting it to add red coke once every 10 minutes. Before the furnace material level reaches the lower end of the chute, manage the boiler inlet temperature T6. The initial temperature of the boiler inlet temperature T6 is 160℃, and the heating rate of the boiler inlet temperature T6 is 10℃ / h~15℃ / h. Manage the lower temperature of the cooling chamber T3≤350℃, the upper temperature of the cooling chamber T4≤450℃, and the heating rates of the lower temperature T3 and the upper temperature T4 of the cooling chamber are both ≤15℃ / h; After the temperature reaches 400°C, maintain it for 24 hours and then continue to increase the temperature; When the temperature is above 650℃, raise the furnace material level to above the upper inclined entrance. Depending on the temperature rise, add red coke once every 30 minutes, add 2 / 3 cans of red coke each time and add the red coke into the dry quenching furnace in 2 to 3 times. When the boiler inlet temperature T6 rises by about 60℃ to 100℃ after adding red coke, the speed of the circulating fan can be appropriately increased to suppress the heating rate of the boiler inlet temperature T6. The speed of the circulating fan is reduced as the boiler inlet temperature T6 decreases. When the boiler inlet temperature T6 recovers to 10℃ to 20℃ higher than before the red coke is loaded, the second furnace is manually loaded with red coke. By analogy, 2 / 3 cans of red coke are added to the dry quenching furnace for each furnace, with an interval of about 30 minutes. After 5 furnaces, red coke can be automatically added through the elevator. Among them: because the temperature T5 of the pre-storage chamber after the red coke drying furnace has reached more than 400°C, before the material level rises to the ramp, the pre-storage chamber temperature T5 may gradually decrease, and the expected decrease is 20°C to 30°C, tending to be stable, and will slowly rise later. The heating rate of the boiler inlet temperature T6 is controlled at 10°C / h, and the upper temperature T4 of the cooling chamber is used as an auxiliary control temperature. When the boiler inlet temperature T6 changes from rising to falling to a heating control value close to the boiler inlet temperature T6, and the upper temperature T4 of the cooling chamber stabilizes to 25°C to 30°C higher than the temperature of the previous red coke loading, red coke is loaded again to ensure slow heating of the boiler inlet and the dry quenching furnace cooling section. The interval time of adding red coke can be appropriately adjusted according to the pre-storage chamber temperature T5 of the dry quenching furnace, the lower temperature T3 of the cooling chamber, the upper temperature T4 of the cooling chamber and the boiler inlet temperature T6, and then the frequency of adding red coke is adjusted; When the pre-storage chamber temperature T5>650℃, the heating rate of the pre-storage chamber temperature T5 is 10℃ / h, and the heating rate of the boiler inlet temperature T6 is 10℃ / h. When the pre-storage chamber temperature T5 and the boiler inlet temperature T6 both reach above 800℃, the drying furnace material level can be gradually raised to the normal production level and organized according to normal production.

[0055] As the drying process progresses, the expansion of each unit equipment in the CDQ system gradually increases. In order to prevent damage to the unit equipment due to excessive expansion, in addition to strictly controlling the heating rate, the expansion of each unit equipment needs to be manually measured once a day. The expansion measurement points include the CDQ outlet expansion joint, boiler inlet expansion joint, boiler outlet expansion joint, secondary dust collector inlet, secondary dust collector outlet, circulating fan outlet and feed water preheater, etc. If there is an abnormality in the expansion measurement value, the number of measurements of the expansion measurement point of the unit equipment corresponding to the abnormal expansion measurement value shall be appropriately increased, and abnormal response measures shall be taken to deal with it, including adjusting the heating rate of the unit equipment and inspecting and handling the installation structural parts of the unit equipment. During the entire drying process, the expansion of each unit equipment in the system is within the control range.

[0056] Red coke baking furnace and production control method after annual overhaul of large-scale dry quenching furnace The baking operation time and temperature control applied after the annual overhaul of the existing large-scale dry quenching furnace are shown in Table 1. After 9 days and 6 hours, the large-scale dry quenching furnace after the annual overhaul can be produced and operated normally, which shortens the baking cycle, eliminates the safety risks of using gas for heating in the baking process, reduces the gas consumption of the gas baking furnace, and the steam and dry quenching coke generated by the early production can be used, which has good economic benefits.

[0057] Table 1 Oven operation time

[0058] By adopting the red coke baking and production control method for a large CDQ furnace after annual maintenance of the present invention, the baking time of the large CDQ furnace is shortened from 18 days to within 10 days, saving 648,000 cubic meters of gas consumption, producing 19,000 tons more steam, and achieving significant economic benefits.

[0059] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for controlling the production of a large-scale dry quenching furnace after annual maintenance of a red coke oven, characterized in that: include: In the warm air drying stage, the drum temperature is increased by passing steam into the drum, the boiler temperature is increased by discharging the boiler blowdown point, and the CDQ furnace inlet temperature is gradually increased through the gas circulation system; In the red coke baking stage, red coke is intermittently added into the cooling chamber of the dry quenching furnace for baking; the baking furnace material level is controlled in the cooling section, the pre-storage chamber temperature and the upper temperature of the cooling chamber are managed, and three constant temperature sections of the pre-storage chamber temperature are set; Regularly confirm the material level, determine the material level control range according to the temperature rise of the pre-storage chamber temperature, and verify the coke input and discharge amount, timely feedback the distribution of red coke in the CDQ furnace and adjust the CDQ furnace inlet damper opening ratio; During the heating period of the red coke, the upper temperature of the cooling chamber, the lower temperature of the cooling chamber, the boiler inlet temperature, the pre-storage chamber relief valve pressure, the boiler pressure, and the air introduction are managed; During the heating period of adding red coke, the temperature of the pre-storage chamber, the temperature of the upper part of the cooling chamber, the temperature of the lower part of the cooling chamber, and the boiler inlet temperature are controlled by controlling the amount of coke added, the frequency of adding red coke, and the amount of coke discharge; During the warm air drying stage, drainage management is performed, including respectively detecting the drainage amount of the steel plate inner wall of the dry quenching furnace protective wall plate, the primary dust collector, the secondary dust collector, the dust exhaust pipe and the rotary sealing valve of the coke exhaust device. When the drainage amount is close to zero, the warm air drying is completed; The expansion volume management is carried out during the CDQ furnace baking period, including measuring the expansion volume of each unit equipment in the CDQ furnace system and taking abnormal response measures when the expansion volume is abnormal.

2. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 1 is characterized in that: The warm air drying stage includes the following operations: heating the pipes by low-pressure steam; controlling the drum liquid level; controlling the flow rate of the boiler forced circulation pump; Prepare chemicals for boiler dosing; Confirm that all valves in the boiler system are in a normal open and closed state; start the circulating fan, adjust the air volume of the circulating fan, and adjust the opening of the CDQ furnace inlet flap; Open the low-pressure steam valve to increase the temperature.

3. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 2 is characterized in that: The operation of the heating operation in the warm air drying stage includes: when the temperature of the pre-storage chamber rises too quickly, the low-pressure steam blowing amount, the circulating fan air volume, the introduced air volume, the opening of the furnace cover and their combinations can be reduced; when the temperature of the pre-storage chamber rises slowly, the low-pressure steam blowing amount, the reduced introduced air volume and their combinations can be increased; when the boiler water temperature rises but the circulating gas temperature does not rise, the introduced air volume can be reduced; when the pre-storage chamber temperature rises too quickly and the circulating gas temperature rises too quickly, the discharged air volume, the introduced air volume and their combinations can be increased; when the temperature difference between the dry quenching furnace inlet temperature and the pre-storage chamber temperature becomes larger, if the circulating gas temperature is greater than the pre-storage chamber temperature, the air volume of the circulating fan is increased.

4. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 1 is characterized in that: The adjustment items and benchmarks of the warm air drying stage include: boiler heating rate, 48℃ / h~52℃ / h; heating rate of the CDQ furnace inlet temperature, 10℃ / h~20℃ / h, and the CDQ furnace inlet temperature is maintained at 160℃~170℃; drum liquid level, 0mm~100mm; boiler water quality, pH8.5~9.5, conductivity 590μs / cm~610μs / cm, SiO2<20ppm; pre-storage chamber pressure, 0Pa~50Pa; the amount of air introduced, gradually increased according to the temperature rise situation; the air volume of the circulating fan, gradually increased according to the temperature rise situation.

5. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 4 is characterized in that: The measures for heating the boiler include controlling the boiler liquid level through continuous discharge and fixed discharge, and adjusting the opening of the drum vent valve at any time as the boiler inlet temperature rises: when the drum pressure reaches 0.2MPa, close the drum vent valve; when the drum pressure reaches 0.3MPa, close the primary superheater vent valve and the secondary superheater vent valve, and slightly open the steam trap; when the drum pressure reaches 0.3MPa, the membrane water-cooled wall header, economizer and boiler drum are regularly discharged.

6. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 1 is characterized in that: The red coke baking stage includes confirming that the process conditions for adding red coke are met: the top vent valve of the dry quenching furnace is cut off, the flue gas is introduced into the dry quenching furnace for desulfurization and denitrification and operates normally, the air inlet valve is fully closed, and the oxygen content in the dry quenching furnace is <5%; the center of the fan outlet of the circulating gas system is opened by 46% to 54%, and the periphery is opened by 46% to 54%; the top water seal groove, the primary dust removal water seal groove, and the emergency vent valve water seal groove are all filled with water; confirm that the boiler system's boiler feed water pump, deoxygenation feed water pump, forced circulation water pump, system drain, and sewage valve are normal.

7. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 1 is characterized in that: The red coke temperature raising measures in the red coke baking stage include: intermittently feeding red coke into the cooling chamber of the dry quenching furnace for baking; circulating inert gas in the circulating gas channel composed of the dry quenching furnace, the primary dust collector, the boiler, the economizer and the secondary dust collector through a circulating fan; controlling the baking furnace material level in the cooling section, managing the pre-storage chamber temperature and the upper temperature of the cooling chamber, determining the interval time for feeding red coke, and setting three constant temperature sections of the pre-storage chamber temperature; maintaining regular manual confirmation of the material level, determining the material level control range and verifying the coke feeding and coke discharge amount according to the temperature increase amplitude of the pre-storage chamber temperature; timely feedback of red coke The distribution of coke in the CDQ furnace is controlled, and the opening ratio of the CDQ furnace inlet damper is adjusted; during the heating period of red coke, the upper temperature of the cooling chamber, the lower temperature of the cooling chamber, the boiler inlet temperature, the pre-storage chamber relief valve pressure, the boiler pressure, and the air introduction are managed; when the boiler inlet temperature exceeds the first temperature, the boiler feed water pump is started to continuously add water, the drum liquid level is controlled by adjusting the drain or the water discharge, and the dosing water pump is enabled to add chemicals to the boiler water; when the boiler inlet temperature reaches the second temperature but the drying furnace material level has not passed the ramp area, it is strictly prohibited to use air introduction, and air introduction can only be carried out after the drying furnace material level has passed the ramp area and stabilized.

8. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 7 is characterized in that: During the period of controlling the baking furnace material level in the cooling section, the heating rate of the pre-storage chamber temperature is controlled at 9℃ / h~11℃ / h, the upper temperature of the cooling chamber is used to determine the interval time of adding red coke, and the pre-storage chamber temperature is set at three constant temperature sections of 105℃~115℃, 155℃~165℃ and 395℃~405℃; during the heating period of adding red coke, management is carried out: the upper temperature of the cooling chamber ≤450℃, the heating rate of the upper temperature of the cooling chamber ≤15℃ / h, the lower temperature of the cooling chamber ≤350℃, the heating rate of the lower temperature of the cooling chamber ≤15℃ / h, the pre-storage chamber relief valve pressure -50Pa~+50Pa, the boiler pressure fluctuation per hour is strictly prohibited from exceeding 0.3MPa, the first temperature is 300℃, and the second temperature is 650℃.

9. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 1 is characterized in that: The red coke feeding and heating operation in the red coke baking stage includes: the initial stage, feeding cold coke; the first temperature range stage, determining the frequency of feeding red coke according to the temperature rise situation; the coke discharge stage, after the red coke is fed into a certain number of furnaces, coke is slowly discharged, and the baking furnace material level is kept at a predetermined position in the cooling chamber according to the consistency of the coke feeding amount and the coke discharge amount; the first heat preservation stage, after reaching the first set temperature, maintaining the first time, and then continuing to heat up; the second temperature range stage, according to the temperature rise situation, adjusting the frequency of feeding red coke and verifying the amount of red coke, and before the baking furnace material level reaches the lower end of the ramp, managing the boiler inlet temperature, the lower temperature of the cooling chamber, and the upper temperature of the cooling chamber; the second heat preservation stage, After reaching the second set temperature, maintain the second time, and then continue to heat up; in the third temperature range stage, after exceeding the third set temperature, raise the kiln material level to above the upper ramp, add the red coke at intervals according to the temperature rise situation, and control the boiler inlet temperature by adjusting the circulating fan speed. The interval time of adding red coke can be appropriately adjusted according to the pre-storage chamber temperature of the dry quenching furnace, the lower temperature of the cooling chamber, the upper temperature of the cooling chamber and the boiler inlet temperature, and then adjust the frequency of adding red coke. When the pre-storage chamber temperature and the boiler inlet temperature both exceed the fourth set temperature, the kiln material level can be gradually raised to the normal production level and organized according to normal production.

10. The method for controlling the production of a large-scale dry quenching furnace after annual repair of a red coke oven according to claim 9, characterized in that: The first temperature range is 100℃~160℃, the first set temperature is 160℃, the first time is at least 24 hours, the second temperature range is 160℃~400℃, the second set temperature is 400℃, the second time is at least 24 hours, the third temperature range is over 650℃, the third set temperature is 650℃, and the fourth set temperature is 800℃.

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