325results about "Tuyeres" patented technology

The invention discloses a layered, zoned and differentiated CO2 injection system and method for a blast furnace, and belongs to the technical field of ferrous metallurgy low carbon. The system comprises a CO2 supply and distribution system, a tuyere area injection module, a furnace body middle-lower part injection module and a furnace body upper part injection module. And according to the temperature gradient and atmosphere layering characteristics in the blast furnace, a differential CO2 distribution proportion and a collaborative thermal compensation strategy are adopted. An oxygen-CH4 synergistic injection device is arranged in a tuyere area, and rapid conversion of CO2 is promoted by using a high-temperature strong reducing atmosphere; a biomass charcoal synergistic injection device and an angle-adjustable nozzle are arranged at the middle lower part of the furnace body, so that efficient gasification reaction is realized; and low-concentration CO2 mixed injection is adopted at the upper part of the furnace body, so that indirect reduction reaction is promoted. According to the invention, the CO2 conversion rate is 65-80%, the coke ratio is reduced by 15-25%, the consumption of CO2 per ton of iron is 260-90Nm < 3 >, the carbon emission is obviously reduced, and the ironmaking efficiency is improved.

The invention relates to the technical field of blast furnace pulverized coal distribution devices, and discloses a uniform distributor for blast furnace pulverized coal injection, which comprises a shell, a feeding pipe is communicated with the lower end of the shell, a plurality of groups of distribution pipes are communicated with the upper part of the shell, and a guide mechanism for guiding and redistributing pulverized coal is arranged in the shell. A feeding amount sensing mechanism for sensing the feeding amount of pulverized coal is arranged in the shell, a feeding amount adjusting mechanism for adjusting the opening size of the feeding pipe in real time according to the feeding amount of the pulverized coal sensed by the feeding amount sensing mechanism is arranged on the inner side of the feeding pipe, and a vibration cleaning mechanism for cleaning the inner wall of the shell is arranged in the shell. According to the invention, airflow containing pulverized coal is guided and redistributed through the guide mechanism, the uniformity of the amount of pulverized coal in different distribution pipes is improved, the combustion uniformity of the blast furnace is improved, the feed quantity sensing mechanism drives the feed quantity adjusting mechanism to move to adjust the opening size of the feed pipe, the stability of the reducing atmosphere in the furnace is guaranteed, and the production efficiency is improved. The quality and yield of molten iron are improved, and stable operation of the blast furnace is guaranteed.

The invention discloses a blast furnace pulverized coal electromagnetic preheating system and process, and relates to the technical field of blast furnace ironmaking. The blast furnace pulverized coal electromagnetic preheating system comprises a pulverized coal bin, an injection tank and a mixer, a radial flow guide device is arranged at the inlet end in a rough preheating pipeline, and the radial flow guide device is used for separating materials according to the diameter and guiding the materials to move on the inner wall of the radial rough preheating pipeline; the intermediate heating device is used for forming a heating channel and heating materials moving along the middle of the coarse preheating pipeline, and a dispersing device is arranged at the outlet end of the coarse preheating pipeline and used for dispersing the materials with different particle sizes to different areas and conveying the materials into the fine preheating pipeline. According to the blast furnace pulverized coal electromagnetic preheating system and process, powder moisture is removed through coarse preheating, powder with different particle sizes is guided to be separated and move towards the inner wall of the coarse preheating pipeline, materials with different particle sizes are dispersed to different areas through fine preheating, and the powder reaches the temperature close to an ignition point.

The invention belongs to the technical field of blast furnace smelting, and particularly discloses a hydrogen-rich carbon circulating oxygen blast furnace blow-in air supply system and method.The system comprises a blast furnace, an air inlet header pipe, a smoke header pipe and a plurality of hot blast stoves, each hot blast stove communicates with a nitrogen inlet pipe and a cold air inlet pipe, and each hot blast stove is provided with an air outlet pipe; each air outlet pipe is communicated with an air outlet header pipe, the air outlet header pipe is communicated with a communicating bustle pipe, the high way is communicated with a plurality of air inlet branch pipes, the bustle pipe is communicated with the air inlet branch pipes, the air outlet header pipe is communicated with an air mixing pipe, the bottom of each hot blast stove is communicated with a smoke exhaust pipe, and each smoke exhaust pipe is communicated with a smoke header pipe. The flue gas header pipe is communicated with a flue gas branch pipe I, the flue gas branch pipe I is communicated with the blast furnace, the flue gas branch pipe I is communicated with a flue gas branch pipe II, the upper end of each hot blast stove is communicated with a flue gas inlet pipe, each flue gas inlet pipe is communicated with the flue gas branch pipe II, and the flue gas branch pipe I is provided with a circulating fan. Efficient temperature control and oxygen reduction are achieved, waste heat recycling is achieved, and safe, energy-saving and low-carbon blow-in is achieved.

A tuyere apparatus according to the present invention comprises: an outer circulation hole disposed on the outermost peripheral side inside a tuyere; and an inner circulation hole disposed on the inner peripheral side of the outer circulation hole. The inner circulation hole has two or more independent flow paths, the two or more independent flow paths being separated from the inner surface of the tuyere. A blast furnace operation method according to the present invention comprises, using the above-described blast furnace tuyere apparatus in a blast furnace: blowing a low oxygen concentration gas, a high oxygen concentration gas having an oxygen concentration higher than that of the low oxygen concentration gas, and a reduction material from the tuyere; blowing the low concentration oxygen gas from the outer circulation hole; blowing the high oxygen concentration gas and the reduction material from the inner circulation hole; and blowing the high oxygen concentration gas and the reduction material separately from the two or more independent flow paths.

The application provides a method for treating blast furnace tuyere coal gas leakage, comprising the following steps: taking the outside of the gap between a large tuyere sleeve and a second tuyere sleeve of a blast furnace tuyere as a polishing surface; polishing the polishing surface to form a rough surface and removing impurities on the rough surface; brushing several layers of epoxy resin on the rough surface, brushing the next layer of epoxy resin after the solidification of each layer of epoxy resin, and forming an adhesion layer after the solidification of each layer of epoxy resin. Compared with the prior art, the method in the scheme polishes and applies glue at the gap between the outside of the large tuyere sleeve and the second tuyere sleeve, forms multiple adhesion layers, blocks the gap, and prevents coal gas leakage.

The tuyere medium sleeve with the protection enhancing function comprises a cylindrical body, and the front end and the rear end of the body are used for being connected with a small tuyere sleeve and a large tuyere sleeve correspondingly to form a hollow sleeve body used for clamping an air supply channel; a cooling cavity is formed in the body wall of the body, and a side grouting opening penetrating through the body wall is formed in the thickness direction of the body wall. A grouting channel penetrating from the rear end to the front end is formed in the length direction of the body wall, a grouting outlet is formed towards the surface of the outer wall of the tuyere small sleeve, and the grouting channel can be repeatedly drilled and dredged so that slurry can flow through the grouting channel many times and can be repeatedly used. According to the tuyere medium sleeve, the grouting channel from the rear end to the front end is designed, so that the grouting material can form a protection layer on the outer wall of the tuyere small sleeve, the protection effect of the tuyere small sleeve is enhanced, and the wear resistance and erosion resistance are improved. The grouting channel can be dredged by drilling, multiple grouting operations are allowed, the maintainability of the structure is improved, and the service life is prolonged.

The utility model provides a device for preventing a blast furnace tuyere blowpipe from sinking. The device for preventing the blast furnace tuyere blowpipe from sinking comprises a tuyere large sleeve, a tuyere medium sleeve, a tuyere small sleeve, a supporting boss, a mounting plate and a moving assembly, the tuyere medium sleeve is arranged at the rear end of the tuyere large sleeve, the tuyere small sleeve is arranged at the rear end of the tuyere medium sleeve, the supporting boss is arranged in the tuyere small sleeve, and the mounting plate is arranged in the tuyere small sleeve. The outer diameter of the supporting boss is matched with the inner diameter of the small tuyere sleeve, and the inner diameter of the supporting boss is matched with the outer diameter of a tuyere blowpipe. According to the device for preventing the blast furnace tuyere blowpipe from sinking, the tuyere blowpipe is not easy to sink when the blast furnace is in damping down due to the arrangement of each structure, so that the maintenance and repair period of workers on the blast furnace is prolonged, and the cost of the workers is reduced.

The invention relates to a microchannel single-cavity tuyere small sleeve and a blast furnace comprising the microchannel single-cavity tuyere small sleeve, the microchannel single-cavity tuyere small sleeve comprises a small sleeve body, the small sleeve body is provided with a heat exchange cavity and a cooling cavity located on the periphery of the heat exchange cavity, and the heat exchange cavity penetrates through the small sleeve body in the length direction; the cooling cavity comprises a first cavity body and a second cavity body which are distributed in the length direction. The partition plate is arranged in the second cavity and surrounds the heat exchange cavity so as to divide the second cavity into a third cavity and a fourth cavity surrounding the radial outer side of the third cavity, and the sides, away from the first cavity, of the third cavity and the fourth cavity communicate with each other; and the at least one first cooling liquid pipe is arranged in the first cavity, the first end of the first cooling liquid pipe communicates with one of the third cavity and the fourth cavity, and the second end of the first cooling liquid pipe penetrates out of the side wall, away from the second cavity, of the first cavity. The temperature of the micro-channel single-cavity tuyere small sleeve is reduced, and damage caused by too high temperature is avoided.

The operation method of a blast furnace improves the ventilation of the lower part of the blast furnace by tuyere injection of fine ore. The operation method of the blast furnace (1) of the invention is characterized in that coal is pulverized as fine coal, and an iron ore having a pulverized ignition loss of 9 mass% or more and 12 mass% or less is pulverized as fine ore, the injection rate of the fine coal is 150 kg / tp or more, the injection rate of the fine ore is 2.5 kg / tp or more and 50.0 kg / tp or less, and the fine coal and the fine ore are injected from the tuyere (2). It is preferable that the iron ore and the coal are pulverized together.

The utility model discloses a dismounting and mounting device for quickly dismounting and mounting middle and small sleeves of a blast furnace tuyere, which comprises a traveling vehicle body, a hydraulic-pneumatic hammer, a translation hydraulic cylinder and a tilting hydraulic cylinder, the hydraulic-pneumatic hammer, the translation hydraulic cylinder and the tilting hydraulic cylinder are assembled on the vehicle body, an anchor hook is assembled at the hammerhead end of the hydraulic-pneumatic hammer, a sliding seat is arranged between the hydraulic-pneumatic hammer and the vehicle body, and one end of the hydraulic-pneumatic hammer is rotatably connected with the sliding seat. The other end of the hydraulic-pneumatic hammer is rotationally connected with the other end of the sliding seat through a tilting hydraulic cylinder so as to drive the hydraulic-pneumatic hammer to tilt up and down and adjust the extension angle of the anchor hook, and the anchor hook extends and retracts by driving the sliding seat to advance and retreat, and the hook part is driven to hook the front end of a small sleeve in a tuyere or abut against the rear end of the small sleeve in the tuyere in a matched manner; therefore, the middle sleeve and the small sleeve of the tuyere can be quickly disassembled and assembled, the damping-down time of a blast furnace is shortened, the labor intensity of workers is effectively reduced, and the production efficiency is improved. The anchor hook can be used for correspondingly pulling out or propping against the middle sleeve and the small sleeve of the tuyere and synchronously driving the hook part to hit the front end or the rear end of the middle sleeve and the small sleeve of the tuyere.

The utility model provides a blast furnace tuyere with a double-sealing structure function and a blast furnace. The blast furnace tuyere comprises a first air guide piece and a second air guide piece, the second air guide piece comprises a first flexible sealing piece, and the first flexible sealing piece is embedded between the inner wall of the first barrel and the outer wall of the second barrel in an interference mode; the third air guide piece comprises a second flexible sealing piece, and the second flexible sealing piece is embedded between the inner wall of the second barrel and the outer wall of the third barrel in an interference mode. The connecting gap of the tuyere is subjected to interference filling through the first flexible sealing piece and the second flexible sealing piece, even if the air guide piece deforms at a high temperature, the high sealing effect is achieved, and therefore the problem of blast furnace gas leakage is avoided. In addition, the replacement frequency of the elements can be greatly reduced, manpower and material resources are saved, and the operation efficiency is indirectly improved. Compared with a conventional blast furnace structure at the present stage, the blast furnace structure has the remarkable advantages of being simple in structure, low in cost, good in sealing effect, wide in application range, capable of reducing overhaul and replacement frequency and the like.

The present invention relates to an ironmaking system and method that couples solid oxide electrolysis with blast furnace waste heat utilization. The system comprises a solid oxide electrolysis system, a hot blast system, a heat exchange network, and a blast furnace body. The solid oxide electrolysis system, driven by the coupling of an external power source and blast furnace waste heat, produces hydrogen and oxygen by electrolyzing water. The hot blast system, fueled by blast furnace gas, continuously delivers high-temperature hot blast to the blast furnace. The heat exchange system uses the waste heat generated by the blast furnace to heat the fuel at the inlet of the solid oxide electrolysis cell and the hydrogen at the inlet of the blast furnace. The blast furnace body is used to reduce ore to smelt pig iron. By recycling waste heat from the blast furnace ironmaking process through the heat exchange network, heating the water at the inlet of the solid oxide electrolysis system and the hydrogen at the inlet of the blast furnace, the system effectively reduces the power consumption of the electrolytic hydrogen production process and is of great significance for the deep energy conservation and carbon reduction of blast furnace hydrogen-rich metallurgy technology.

The invention relates to the technical field of pulverized coal distributors, and discloses an intelligent uniform distribution blast furnace coal injection device which comprises a conical distribution chamber, the distribution chamber comprises a lower conical barrel and an upper conical cover detachably installed on the top of the lower conical barrel, and the bottom of the lower conical barrel fixedly communicates with a powder supply pipeline. According to the intelligent uniform distribution blast furnace coal injection device, uniform distribution and maintenance-free operation can be stably realized for a long time; by means of rotating airflow formed by the built-in flow guide element, pulverized coal is fully mixed and evenly distributed in the cavity and then shunted, the deviation of the amount of pulverized coal at the outlet of each branch pipe is extremely small, and the consistency of coal injection of all tuyeres is guaranteed. The method is crucial for stable operation of the blast furnace, fluctuation of the temperature and the reducing atmosphere in the furnace caused by uneven distribution can be reduced, the anti-blocking performance is greatly improved due to the unique design of the coarse particle settling tank, coarse particles and foreign matter are actively separated and collected and cannot enter an outlet pipeline, and the risk that an outlet pipe is blocked in the past is avoided.

The utility model discloses a fully utilized inner hole structure of a blast-furnace tuyere small sleeve, relates to the technical field of blast-furnace tuyere small sleeves, and aims to solve the problems that the existing blast-furnace tuyere small sleeve is harsh in working environment, is easy to damage under the conditions of tuyere blockage, non-uniform airflow distribution at the upper part of a blast furnace or airflow fluctuation, and is not easy to damage. Meanwhile, molten iron makes direct contact with the copper wall of a small sleeve, heat flow drastically increases within an extremely short time, small sleeve melting loss can be caused, meanwhile, a necking lining is installed in the small sleeve, the size of the lining is not appropriate, the lining cannot be flush with the front section of the small sleeve, airflow entering a furnace is disordered, blast furnace inlet airflow is disordered, and the furnace condition is worsened. According to the technical scheme, the small sleeve is characterized by comprising a small sleeve body, a small sleeve air channel is formed in the center of the interior of the small sleeve body, a front air opening is reserved in the other end, located on the outer side of the small sleeve air channel, of the interior of the small sleeve body, and a surfacing layer is arranged on the outer side of the small sleeve body. And the effects of stable work, cost reduction and efficiency improvement are achieved.

The invention discloses a blast furnace smooth quantitative regulation and control method based on an operation system, and relates to the field of blast furnace regulation and control. The method comprises the following steps: classifying blast furnace operation parameters according to a raw fuel system, a charging system, an air supply system, a heat system and a slagging system, and combining influence coefficients and system weights of the parameters on blast furnace pressure difference to construct a comprehensive influence quantity; meanwhile, the blast furnace pressure difference fluctuation quantity and the center and edge temperature difference are obtained in real time, whether early warning regulation and control are needed or not is judged based on whether the comprehensive influence quantity, the blast furnace pressure difference fluctuation quantity and the center and edge temperature difference exceed respective preset threshold values or not, if yes, the early warning grade is judged, and the dominant abnormal operation system is recognized based on the influence quantity of each system; and the corresponding parameter adjustment amount is calculated according to the influence amount of the system, and regulation and control are executed according to the adjustment range limited by the early warning level, so that early and quantitative identification of the abnormal furnace condition is realized, and passive intervention only depending on a single index or a post phenomenon is avoided.

The present invention discloses a method with which it is possible to easily control the flow rate of a reducing gas when the reducing gas is blown into the inside of a blast furnace, and with which it is also possible to stably blow the reducing gas into the blast furnace even in cases where the slag or the like flows back into a hot air tuyere. A method for blowing a reducing gas into a blast furnace according to the present disclosure comprises: blowing hot air into the inside of the blast furnace from a hot air tuyere which is provided below the lower end of the shaft of the blast furnace and above the taphole; and blowing a reducing gas into the inside of the blast furnace from a reducing gas blowing port which is provided below the lower end of the shaft of the blast furnace and above the taphole. Here, the reducing gas functions as a reducing material inside the blast furnace. The reducing gas blowing port is provided separately from the hot air tuyere, and the height position P1 of the center of the reducing gas blowing port is located above the height position P2 of the center of the hot air tuyere.

The invention relates to the field of blast furnace ironmaking, and particularly discloses electromagnetic preheating equipment for a blast furnace pulverized coal pipeline, which comprises a preheating pipe connected between a mixer and a blast furnace, the preheating pipe is made of a metal material, a plurality of channels for pulverized coal to pass through are arranged in the preheating pipe, and an electromagnetic heating coil is sleeved outside the preheating pipe. After alternating current is introduced into the electromagnetic heating coil, an alternating magnetic field is generated, the preheating pipe generates eddy current and then emits heat, heat is transferred to pulverized coal and nitrogen flowing in the pipeline, the temperature of the pulverized coal rises, and the purpose of preheating the pulverized coal is achieved. The electromagnetic heating coil generates eddy current in the metal preheating pipe to generate heat, so that non-contact heating is realized, and heat radiation loss and open fire hidden dangers of traditional resistance heating are avoided; the alternating magnetic field directly acts on the preheating pipe, and the heat efficiency is obviously higher than that of an indirect heating mode; heat is uniformly conducted to pulverized coal and nitrogen in the channel through the pipe wall, and local overheating or heating dead angles are avoided.

A method for a blast furnace includes pulverizing coal to make pulverized coal, and pulverizing iron ore to make pulverized iron ore, and injecting the pulverized coal and the pulverized iron ore from a tuyere. A loss on ignition of the iron ore is greater than or equal to 9% by mass and less than or equal to 12% by mass, an injection rate of the pulverized coal is greater than or equal to 150 kg / tp, and an injection rate of the pulverized iron ore is greater than or equal to 2.5 kg / tp and less than or equal to 50.0 kg / tp.

A method for operating a blast furnace with which, even in the case where there is an increase in the powder ratio of coke to be charged into the blast furnace, it is possible to achieve the stabilization of blast furnace operation. The method includes blowing air through a tuyere disposed in a lower part of the blast furnace, successively measuring a particle size distribution of coke transported to the blast furnace, and adjusting at least one of a blast volume and a coke ratio in accordance with an index derived from the particle size distribution.

Provided is a method for operating a blast furnace with which it is possible to reduce the reduction material ratio by using coke having an appropriate reactivity. Provided is a method for operating a blast furnace in which an iron-based starting material and coke are charged in layers from the top of the blast furnace and an oxygen-containing gas and a reducing material containing a hydrocarbon gas are blown into the interior of the blast furnace from the tuyere of the blast furnace, the method being characterized in that: when the oxygen concentration of the oxygen-containing gas is 80 vol% or more, the oxygen-containing gas is introduced into the blast furnace; coke having a reactivity index CRI of 35 or less is used as the coke to operate. The hydrocarbon gas is preferably a gas of hydrogen and / or a hydrogen-containing compound.

The invention belongs to the technical field of blast furnace cooling, and particularly relates to a cooling water supply system of a blast furnace air supply device and a cooling method. One end of a hot water recovery pool is connected with a filter pump through a pipeline, the filter pump is connected with a fiber ball filter, and the fiber ball filter is connected with the hot water recovery pool through a pipeline; the other end of the hot water recycling pool is connected with a lifting pump through a pipeline, the lifting pump is connected with a cooling tower through a pipeline, the cooling tower is connected with a cooling water pool, and one end of the cooling water pool is connected with a high-pressure water pump. The pipeline filters are connected with a tuyere small sleeve of an air supply device, the tuyere small sleeve of the air supply device is connected with a hot water recovery pool through a pipeline, and an accident emergency water supply mechanism is additionally arranged at the water inlet end of the tuyere small sleeve of the air supply device. According to the system, cooling water is provided by the accident emergency water supply mechanism during double-path high-voltage power loss and diesel engine pump idling time, and the tuyere small sleeve is prevented from being burnt out and exploded through continuous water supply.

The utility model belongs to the technical field of blast furnace cooling devices, and relates to a novel cooling system on-line monitoring device which comprises a tuyere sleeve, a water inlet pipe and a water outlet pipe are respectively connected onto the tuyere sleeve, connecting flanges are arranged at the tail ends of the water inlet pipe and the water outlet pipe, and turbine flowmeters are arranged in the water inlet pipe and the water outlet pipe. A temperature display screen is arranged on the side wall of the tuyere sleeve and comprises a temperature sensing probe, one end of the temperature sensing probe is inserted into the tuyere sleeve, a bearing is arranged at the other end of the temperature sensing probe and connected with a rotary connecting block, the rotary connecting block is connected with a fixed connecting block, and a liquid crystal screen is arranged on the fixed connecting block. The blast furnace tuyere sleeve cooling efficiency monitoring device has the dual functions of monitoring the cooling water flow and the tuyere temperature in real time, accurately detects the flow speed of a pipeline through the built-in turbine flowmeter, and realizes dynamic visual monitoring of the cooling efficiency of key parts of the blast furnace tuyere sleeve in cooperation with the rotatable digital display screen.

The utility model relates to an adjustable air supply device bend support, which comprises a nozzle, a spray pipe seat and a bend body, an auxiliary support component is arranged at the bottom of the spray pipe seat, a mounting plate is arranged at the bottom of the auxiliary support component, a connecting plate is arranged on the outer side of the bend body, and the connecting plate is connected with the spray pipe seat. Two lifting supporting assemblies are arranged between the connecting plate and the mounting plate, two mounting grooves are formed in the top of the mounting plate, parts of the two lifting supporting assemblies are mounted in the two mounting grooves correspondingly, and the auxiliary supporting assembly comprises a mounting base and a high-temperature alloy corrugated lining plate. Under the action of the alloy lifting frames on the left side and the right side of the bent pipe body, the connecting plate on the outer side of the bent pipe body can be supported, and under the action of the high-temperature alloy corrugated lining plate, the impact influence of high-pressure airflow and high-speed airflow entering the bent pipe body is reduced, and the sealing performance of the connecting portion of the bent pipe body and a spray pipe base is guaranteed.

The utility model provides a special tool suitable for blast furnace fast opening tuyere, including steel fiber, be provided with the beat tray on the outside wall of steel fiber, the outside wall of steel fiber is slidably sleeved with slide hammer, slide hammer sets up in beat tray far from steel drill tip one side, slide hammer is along the axial of steel fiber and is towards beat tray one side slide and hits beat tray, the reaction force that utilizes slide hammer hits generates drive steel fiber to the tip direction movement to open blast furnace tuyere, the utility model discloses a slide hammer along the steel fiber / steel pipe slide hits beat tray's design, replaces traditional many people cooperation mode, only needs 1-2 people to complete operation, saves manpower and time, simultaneously, slide hammer slide hits impact force stability, high frequency, and the efficiency of opening tuyere is greatly improved.

A reducing gas injection system (10) for a blast furnace having a blast furnace wall (30), comprising: a reducing gas distribution pipe (20); and one or more injection devices (40) attached to the blast furnace wall at shaft level, wherein the reducing gas distribution pipe (20) is attached to the blast furnace wall (30) or a supporting structure thereof, and the injection devices (40) include a nozzle body (42) having a peripheral wall extending along a longitudinal axis from a front end having at least one injection hole (41) to an opposite rear end having an inlet (43), the nozzle body including an internal gas channel for directing reducing gas from the inlet (43) to the injection hole (41), and the nozzle body (42) is attached through an opening in the blast furnace wall (30) so that the front end having the injection hole (41) is located inside the blast furnace (31). a nozzle body (42) including a peripheral mounting portion configured to gas-tightly connect the injection device to the opening in the blast furnace wall, the nozzle body (42) including a peripheral mounting portion configured to gas-tightly connect the injection device to the opening in the blast furnace wall, the inlet (43) being fluidly connected to a reducing gas distribution pipe (20) by an injection device support, the injection device support including a supply pipe (51) connected to the reducing gas distribution pipe (20), an elbow (52) connected to the supply pipe (51), and an injection pipe (53) connected to the elbow (52), the injection pipe (53) being gas-tightly flanged to the inlet (43) of the injection device (40) and gas-tightly attached to the injection pipe (53) and / or an outlet of the elbow including at least one Cardan compensation joint (531).

The utility model discloses a blast-furnace tuyere small sleeve leakage detection device, which comprises a plurality of water return grooves fixedly arranged on a blast-furnace tuyere platform; a first joint of the tee joint is connected with a small sleeve water outlet pipeline, a second joint is connected with a small sleeve water return ball valve, and the small sleeve water return ball valve is connected with a furnace bottom medium-pressure water return main pipe; one end of the water tank is provided with a water inlet pipe, the other end of the water tank is provided with a water outlet pipe, the water inlet pipe is used for connecting a third connector of the tee joint, and the water outlet pipe is used for connecting a recovery tank; and the detection device is used for detecting whether gas discharged from the gas detection port contains carbon monoxide. The water inlet pipe is connected with the third connector of the tee joint, the water outlet pipe is connected with the water inlet in the water return groove, the water return ball valve is closed, the carbon monoxide detector is connected into the gas detection opening, then the small sleeve water inlet ball valve is slowly controlled, and therefore leakage detection can be rapidly conducted on the tuyere small sleeve on line, and whether the tuyere small sleeve is damaged or not can be accurately judged.

The invention discloses a short-term overhaul construction method for a blast furnace body. The method comprises the following steps: lowering the charge level of the blast furnace below the center line of a tuyere; damping down the blast furnace; removing the tuyere medium sleeve, the tuyere small sleeve and the furnace top large manhole; hoisting a row rake to level the charge level in the furnace; a covering agent is sprayed to cover the material surface in the furnace, and slag removal and danger removal are conducted on a furnace body; a cooling wall operation hanging scaffold is assembled on the surface of the covering agent; the cooling wall is replaced; cleaning the upper semicircles of the tuyere combined bricks; a cooling wall operation hanging scaffold serves as a construction platform to clean the surface of the cooling wall in the area above the tuyere, and wet spraying is conducted; a furnace throat steel brick protection plate is replaced; local repairing is conducted on the gas sealing cover spraying paint; removing a covering agent and a cooling wall operation hanging scaffold; performing synchronous construction outside the furnace; reassembling furnace top and tuyere equipment; the furnace body is pressed for leakage detection; and carrying out blast furnace charging and reblowing production. According to the short-term overhaul construction method for the blast furnace body, a systematic thought is provided for short-term overhaul of the blast furnace, the construction period required by short-term overhaul of the blast furnace can be shortened, and the shutdown loss is reduced.

A method for operating a smelting furnace installation, in particular a blast furnace installation, comprises the steps of feeding coke, iron oxide-containing material, and optionally fluxing agents to the top of the smelting furnace, injecting a first reducing gas containing hydrogen at a temperature above 1600°C at the tuyere level of the smelting furnace, and injecting a second reducing gas at a lower shaft level of the smelting furnace, wherein the coke is fed at a lump coke rate of less than 220 kg / tHM, preferably less than 200 kg / tHM, more preferably less than 180 kg / tHM, and the density of the first reducing gas is less than 0.80 kg / Nm 3 Less than 0.60 kg / Nm 3 Less than 0.30 kg / Nm 3 is less than.

A method for operating a smelting furnace installation, in particular a blast furnace installation, the method comprising - feeding coke, iron oxide containing material and if required fluxing agents to the top of the smelting furnace, - injecting a first reducing gas containing hydrogen at a tuyere level of the smelting furnace at a temperature above 1600 °C, and - injecting a second reducing gas at a lower shaft level of the smelting furnace, wherein coke is fed at a lump coke rate below 220 kg / t HM, preferably below 200 kg / t HM and more preferably below 180 kg / t HM and wherein the density of the first reducing gas is below 0.80 kg / Nm3, preferably below 0.60 kg / Nm3 and most preferably below 0.30 kg / Nm3.