SU897859A1

SU897859A1 - Connection pipe device for air-heater hot blasting in blast furnace

Info

Publication number: SU897859A1
Application number: SU792876566A
Authority: SU
Inventors: Александр Иванович Тихонов; Виктор Александрович Шолотов; Александр Иванович Дейко; Сергей Федорович Анищенко; Юлий Залманович Ратнер; Олег Иванович Демин
Original assignee: Ждановский Металлургический Завод "Азовсталь" Им.С.Орджоникидзе; Донецкий научно-исследовательский институт черной металлургии
Priority date: 1979-11-13
Filing date: 1979-11-13
Publication date: 1982-01-15

Description

Изобретение относится к черной металлургии, в частности к оборудованию воздухопроводной арматуры воздухонагревателей доменной печи.The invention relates to ferrous metallurgy, in particular to equipment for air duct valves of blast furnace air heaters.

В связи с интенсификацией процесса нагрева воздуха в доменных воздухона- ⁵гревателях, выполнения насадки и камеры горения из высокоразрыхляющего динаса (за счет использования в качестве топлива природного газа) снижается стойкость вспомогательных узлов оборудования, из-за чего повышаются простои доменной печи и это приводит к ограничению температуры горячего дутья. Используемые на воздухонагревателе литые шту— церы с наружной, между фланцами, камерой охлаждения не удовлетворяют современным условиям эксплуатации, так как наружная перемычка камеры охлаждения •между фланцами штуцера деформируется _мв литом корпусе, появляются трещины и течи воды. В патрубке штуцера и на внутр_еннем диаметре фланца, в местах стыка с фланцами газоотсекающих кла панов возникают трещины и течь воды через трещины. Примыкающая часть клад,ки к штуцеру из-за попадания воды обрушается в проем клапанов газоотсекающего клапана, препятствуя их нормальной работе, что приводит к дальнейшему разрушению фланца, и следовательно к снижению производства чугуна. Замена и аварийный ремонт штуцеров в период между капитальными ремонтами 3 разряда ведет к значительному перерасходу средств.Due to the intensification of the process of heating the air in blast-furnace ⁵ heaters, making the nozzle and the combustion chamber from high-loosening dinas (due to the use of natural gas as fuel), the stability of auxiliary components of the equipment decreases, due to which the downtime of the blast furnace increases and this leads to limiting the temperature of hot blast. As used in the heater alloy shtu- tsery the outer, between the flanges, the cooling chamber do not satisfy modern operating conditions, since the outer cooling chamber jumper • fitting between flanges deform _m molded case, cracks and leaks water. The pipe fitting and on the internal flange diameter _ennem in the joints with flanges gazootsekayuschih stem pans cracks occur and the water flow through the cracks. The adjoining part of the treasure, ki to the fitting, falls into the opening of the valves of the gas-cutting valve due to water ingress, interfering with their normal operation, which leads to further destruction of the flange, and consequently to a decrease in the production of cast iron. Replacement and emergency repair of fittings in the period between overhauls of the 3rd category leads to a significant cost overrun.

Наиболее близким к изобретению по технической сущности и достигаемым результатам является устройство штуцера горячего дутья воздухонагревателя доменной печи, содержащее цилиндрический патрубок, облицованный изнутри огнеупорной футеровкой,фланцы, соединенные между собой ребрами жесткости Г1] Недостатками такого устройства являются низкая эффективность охлаждения патрубка и внутренней поверхности фланца, недостаточная термостойкость кожуха камеры охлаждения, а также разностейность в охладительной камере, приводящая при высоких температурах к трещинам во фланце, тече воды, обрушению кладки, простоям воздухонагревателя.The closest to the invention in technical essence and the achieved results is the device of the hot blast fitting of the blast furnace air heater, containing a cylindrical pipe, internally lined with refractory lining, flanges interconnected by stiffeners G1] The disadvantages of this device are the low cooling efficiency of the pipe and the inner surface of the flange, insufficient heat resistance of the casing of the cooling chamber, as well as the difference in the cooling chamber, resulting at high temperatures temperatures to cracks in the flange, water leakage, collapse of masonry, downtime of the heater.

Нель изобретения — снижение срока ремонта штуцера, повышение стойкости штуцера и футеровки.Nel invention - reducing the repair time of the nozzle, increasing the durability of the nozzle and lining.

Поставленная цель достигается тем, что в устройстве штуцера горячего дутья воздухонагревателя доменной печи, содержащем цилиндрический патрубок, облицованный изнутри огнеупорной футеровкой, фланцы, соединенные между собой ребрами жесткости, патрубок снабжен холодильЗамком, выполненным в виде двух симметричных полуколец, установленных между фланцами и покрытых торкретмассой в месте сочленения патрубка и холодильника.This goal is achieved by the fact that in the device of the hot blast fitting of the blast furnace air heater containing a cylindrical pipe lined internally with refractory lining, flanges interconnected by stiffeners, the pipe is equipped with a chill Lock made in the form of two symmetrical half rings installed between the flanges and covered with gunite mass the junction of the pipe and the refrigerator.

На фиг. 1 изображены места расположения штуцеров воздухонагревателя и воздухопровода горячего дутья ; на фиг.2 — устройство штуцера, сечение по оси.In FIG. 1 shows the locations of the air heater fittings and the hot blast air duct; figure 2 - device fitting, section along the axis.

Устройство содержит цилиндр 1 и патрубок 2, облицованные изнутри по поверхности огнеупорной кладкой 3. Фланцы 4 и 5 соединены между собой ребрами жесткости 6_;. Патрубок 2 снабжен холодильником 7, расположенным по внутренней его поверхности и фланцев 4 и 5. Холодильник 7 выполнен в виде сгйимегричных в сечении полуколец 8, которые прикреплены друг к другу и соответственно к фланцам 4 и 5. Холодильник 7 расположен так, что внутренним диаметром он охватывает зауженную внешнюю поверхность огнеупорной кладки штуцераThe device comprises a cylinder 1 and a pipe 2, internally lined on the surface with refractory masonry 3. Flanges 4 and 5 are interconnected by stiffeners 6 _; . The pipe 2 is equipped with a refrigerator 7 located on its inner surface and flanges 4 and 5. The refrigerator 7 is made in the form of semimeric cross-sections 8, which are attached to each other and, respectively, to the flanges 4 and 5. The refrigerator 7 is located so that it has an inner diameter covers the tapered outer surface of the fitting refractory

9. а наружным диаметром поверхности контактирует с патрубком 2 и фланцами 4 и 5. К холодильнику подсоединены две трубы 10 снизу и сверху для подвода и отвода охладителя. Патрубок, цилиндр и холодильник изнутри покрыты торкретмассой 11. (показан сварной вариант).9. and the outer diameter of the surface is in contact with the pipe 2 and flanges 4 and 5. Two pipes 10 are connected to the refrigerator from below and from above for supply and removal of the cooler. The pipe, cylinder and refrigerator are internally coated with shotcrete 11. (welded version is shown).

Устройство работает следующим образом.The device operates as follows.

Через трубы 10 снизу вверх постоянно подается охладитель (вода, пар, азот, воздух и др.). В режиме нагрева воздухонагревателя газовая горелка зажжена и продукты горения через штуцер 9 подаются в камеру горения. Причем продукты горения с температурой 16001700°С смывают поверхность огнеупорной кладки 3. Тепло от продуктов горения сначала воспринимает огнеупорная кладка 3, слой торкретмассы 11, а затем холодильник 7. Такая конструкция холодильника 7 предотвращает перегрев огнеупорной кладки 3 й фланцев 4 и 5, патрубка 2 штуцера 9, выполнение холодильника 7 из двух полуколец и крепление их между собой и к фланцам 4 и 5 способствует рациональному симметричному распределению термодинамических нагрузок в вертикальной и горизонтальной плоскостях.Cooler (water, steam, nitrogen, air, etc.) is constantly supplied through pipes 10 from bottom to top. In the heating mode of the air heater, the gas burner is ignited and the combustion products through the nozzle 9 are fed into the combustion chamber. Moreover, the combustion products with a temperature of 16001700 ° C wash off the surface of the refractory masonry 3. Heat from the combustion products is first absorbed by the refractory masonry 3, the shotcrete layer 11, and then the refrigerator 7. This design of the refrigerator 7 prevents overheating of the refractory masonry of the 3rd flanges 4 and 5, pipe 2 fitting 9, the implementation of the refrigerator 7 of two half rings and fixing them between each other and to the flanges 4 and 5 contributes to a rational symmetric distribution of thermodynamic loads in the vertical and horizontal planes.

В режиме дутья воздухонагревателя 10 через верхний штуцер воздухонагревателя (через штуцер горячего дутья) поступает нагретый обогащенный кислородом до 35% воздух. Температура горячего дутья в этом случае достигает 1550°С. ₁₅ Воздух, смывая кладку 3, передает тепло сначала огнеупорной кладке, слою торкретмассы 11 и затем холодильникуIn the blast mode of the air heater 10, the heated air enriched with oxygen up to 35% enters through the upper nozzle of the air heater (through the nozzle of the hot blast). The temperature of the hot blast in this case reaches 1550 ° C. ₁₅ Air, washing off masonry 3, transfers heat first to refractory masonry, shotcrete layer 11 and then to the refrigerator

7. Симметричное выполнение холодильника 7, его крепление снизу к фланцам ₂₀ 4 и 5, патрубку 2 позволяет обеспечить необходимую жесткость штуцера 9, допустимую температуру нагрева фланцев 4 и 5, патрубка 2 и огнеупорной кладки 3 и значительно понижает вероятность ₂₅ возникновения трещин и деформации.7. The symmetrical design of the refrigerator 7, its mounting from the bottom to the flanges ₂₀ 4 and 5, the pipe 2 allows you to provide the necessary rigidity of the fitting 9, the permissible heating temperature of the flanges 4 and 5, the pipe 2 and the refractory masonry 3 and significantly reduces the likelihood of ₂₅ cracks and deformation.

Конструкция штуцера способствует ускорению модернизации находящихся в эксплуатации штуцеров и снижению времени простоев доменной печи при теку₃θ щем ремонте и обслуживании. Применение предлагаемого устройства позволяет предотвратить простои воздухонагревателей в год до 5000 ч, снизить объем работ по текущему ремонту огнеупорной кладки штуцеров на 40%.The design of the nozzle helps to accelerate the modernization of the fittings in operation and to reduce the downtime of the blast furnace during ₃ θ repair and maintenance. The use of the proposed device can prevent downtime of air heaters per year up to 5000 hours, reduce the amount of work on the maintenance of refractory masonry fittings by 40%.

Claims

The invention relates to ferrous metallurgy, in particular, to equipment for air conduit fittings of blast furnace air heaters. In connection with the intensification of the process of heating air in blast furnaces, making nozzles and combustion chambers from high loosening dinas (due to using natural gas as a fuel), the durability of auxiliary equipment is reduced, which increases the downtime of the blast furnace and this leads to limited temperature hot blow. The cast fittings used on the air heater with an outer between the flanges, the cooling chamber do not satisfy modern conditions of operation, because the outer chamber lintel cooling between the flanges of the fitting deforms in the molded case, cracks and water leaks appear. In the fitting nozzle and on the inside diameter of the flange, at the junction points with the flanges of the gas cutting valves, cracks and water flow through the cracks. The adjoining part of the cladding to the fitting, due to the ingress of water, collapses into the opening of the valves of the gas-isolating valve, preventing their normal operation, which leads to further destruction of the flange, and consequently to a decrease in the production of iron. Replacing and emergency repair of fittings in the period between major repairs of discharge 3 leads to a significant overspending. The closest to the invention to the technical essence and the achieved results is the device of the hot blast stove fitting for a blast furnace, containing a cylindrical nozzle, lined from the inside with a refractory lining, flanges interconnected by stiffeners ij. The disadvantages of such a device are low cooling efficiency of the nozzle and internal flange air flow, insufficient heat resistance of the cooling chamber casing, as well as difference in the cooling chamber, leading to high cracks in the flange, water leakage, collapse of the masonry, just an air heater. Zero of the invention - reducing the time of repair of the nozzle, increasing the durability of the nozzle and lining. The goal is achieved by the fact that the B device for a choke fitting is a hot blowing air blast furnace of a blast furnace containing a cross-pipe branch pipe, lined from the inside with a refractory lining, flanges interconnected with stiffeners, the branch pipe is equipped with a two-sided seam ring made in the form of two symmetrical semi-rings, between flanges and gunned masses at the junction of the pipe and the cooler. FIG. 1 shows the locations of the air heaters and the hot air duct in FIG. 2, the device 2. tutsera, the cross section along the axis. The device contains a cylinder 1 and a pipe 2, lined from the inside on the surface of the refractory masonry 3. The flanges 4 and 5 are interconnected by stiffening ribs 6 ,. Pipe 2 provided with a refrigeration 7 located along its inner surface and flanges 4 and 5 Refrigerator 7 is made in the form of ciftviMeTrAch1x in section of half-rings 8, which are attached to each other and respectively to flanges 4 and 5. The refrigerator 7 is located so that it has an internal diameter covers the narrowed outer surface of the refractory masonry of the fitting 9. And the outer diameter of the surface is in contact with the pipe 2 and the flanges 4 and 5. The pipe 10 is connected from the bottom and top to the refrigerator for supplying and discharging the cooler. The inside of the pipe, the cylinder and the fridge are covered with shotcrete 11 (a welded version is shown). The device works as follows. A cooler (water, steam, nitrogen, air, etc.) is continuously supplied through pipes 10 from bottom to top. In the heating mode of the air heater, the gas burner is ignited and the combustion products are fed through the fitting 9 into the combustion chamber. Moreover, the combustion products with a temperature of 16001700 ° C wash off the surface of the refractory masonry 3. Heat from the combustion products is first sensed by the refractory masonry 3, the gunite 11, and then the refrigerator 7. This cooling structure 7 prevents overheating of the refractory masonry 3 and the flanges 4 and 5, pipe 2 fitting 9, making refrigerator 7 of two half-rings and fixing them between themselves and to flanges 4 and 5 contributes to a rational symmetric distribution of thermodynamic loads in the vertical and horizontal planes. In the air heater blowing mode, heated air enriched with oxygen up to 35% enters through the upper air heater fitting (through the hot blow fitting). The temperature is hot for blowing in this case reaches. Air flushing masonry 3 transfers heat first to the refractory masonry, gunning mixture 11 and then to refrigerator 7. Symmetrical design of refrigerator 7, its mounting from the bottom to flanges 4 and 5, pipe 2 ensures the required rigidity of fitting 9, permissible heating temperature of flanges 4 and 5, the nozzle 2 and the refractory masonry 3 and significantly reduces the likelihood of cracking and deformation. The design of the nozzle contributes to the acceleration of the modernization of the in-use nozzles and the reduction of the downtime of the blast furnace during maintenance and servicing. The application of the proposed device allows to prevent downtime of air heaters per year up to 5000 hours, to reduce the amount of work on the current repair of refractory masonry fittings by 40%. The invention The device of a hot-blast stove blowing a blast furnace, containing a cylindrical pipe lined with a refractory lining, flanges interconnected by stiffeners, characterized in that, in order to reduce the time for repairing the choke, increase the resistance of the lining, the pipe is equipped with a fridge. in the form of two symmetrical half-rings, installed between the flanges and the coated -core-mass, at the junction of the pipes and the refrigerator. Sources of information taken into account during the examination 1. Zyuzin V, I. Mechanical material handling equipment of blast furnaces. M., 1962, p. 310-311, fig.240.