211results about "Heating stoves" patented technology

An energy storage system (TES) converts variable renewable electricity (VRE) to continuous heat at over 900° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. The delivered heat which may be used for processes including power generation and cogeneration. In one application, thermal energy storage systems are used to improve efficiency and reduce carbon emissions associated with processing materials or other industrial applications.

The invention relates to a method for implementing double-furnace-shell transformation when a furnace shell of a hot-blast stove is cracked, which can effectively solve the problem of cracking of the furnace shell of the existing hot-blast stove, and adopts the technical scheme that the method comprises the following steps of: 1) dismounting a hoop; 2) designing a new furnace shell; 3) manufacturing a new furnace shell; (4) a new furnace shell is installed; (5) construction of the hole opening part of the old furnace shell; (6) a new hoop is welded; (7) welding a collapsible corrugated compensator at the new and old connection part on the upper part of the double furnace shells to absorb and release the expansion and contraction asynchronous difference of the new and old furnace shells; according to the method, the new furnace shell is installed outside the original furnace shell, the pressure of the hot-blast stove and the compressive strength of the furnace shell are effectively improved, the stress of a weld joint and a heat affected zone of the furnace shell is reduced, the service life of the furnace shell of the hot-blast stove is greatly prolonged, the using effect is good, and practicability is high; the method is an innovation of the cracking modification method of the hot-blast stove shell.

The present invention belongs to the technical field of energy conservation and emission reduction in metallurgy and iron and steel, and proposes a method and system for source control of sulfur dioxide emissions from flue gas of iron-making hot blast furnaces, aiming to solve the problem of source sulfur element control in the blast furnace iron-making process, so as to achieve the purpose of standard emission of sulfur dioxide from flue gas of hot blast furnaces at all times. The system includes a data acquisition and transmission module, a memory, an analysis and calculation module, a data monitoring module, and a control terminal. The input end of the data acquisition and transmission module is respectively connected to the data monitoring module and the metering system and component detection system of the blast furnace body, and its output end is respectively connected to the analysis and calculation module and the control terminal; the data acquisition and transmission module is interactively connected to the memory, the analysis and calculation module and the control terminal. The present invention performs origin control from the source of blast furnace raw materials and operations, and has the characteristics of few control actions, short time, compact rhythm and high production efficiency.

The invention provides an intelligent temperature regulation control method for a hot blast stove system based on a prediction model and self-adaptive control. The method comprises the following steps: S1, collecting operation data of a hot blast stove; s2, establishing a prediction model; s3, designing an intelligent temperature regulation controller based on model predictive control (MPC) to realize accurate prediction and regulation of the target temperature; s4, designing an air-fuel ratio (AFR) adaptive constraint mechanism, and dynamically optimizing the combustion efficiency and the emission performance; s5, a closed-loop intelligent temperature adjustment control execution unit is constructed, and real-time adjustment of key operation parameters is achieved; and S6, system integration and online deployment are completed, and it is ensured that the hot blast stove can keep stable temperature control under different working conditions and disturbance conditions. According to the method, through combination of prediction and adaptive constraint, the response speed and the control precision of the system to the working condition change are improved, and the operation stability is improved.

The invention discloses a method for preventing a heat exchanger of a blast furnace hot blast stove from being blocked and losing efficacy. A flue gas inlet, a high-temperature section heat exchange box, a low-temperature section heat exchange box and a dirt settling box are adjacently arranged in the vertical direction; high-temperature flue gas enters from the flue gas inlet in the vertical direction, sequentially flows through the high-temperature section heat exchange box, the low-temperature section heat exchange box and the dirt settling cavity and then flows out from the flue gas outlet, and the flue gas vertically flows in the flue gas inlet from top to bottom, so that the flowing resistance of the flue gas can be reduced; the heat exchanger is provided with the dirt settling box, blockage substances generated in the circulation process of the smoke can fall into the dirt settling box due to the gravity effect, deposition of dust in the smoke and corrosion products on the heat exchange elements on the heat exchange elements is greatly reduced, meanwhile, the flushing device is arranged, the possibility that the heat exchanger is blocked is reduced, and the heat exchange efficiency of the heat exchanger is improved.

The invention discloses a hot blast stove baking control system, control method and equipment and a storage medium. The hot-blast stove baking control system comprises at least one hot-blast stove communicated with a blast furnace and providing heat energy for the blast furnace; a pressure detection module and a temperature detection module are arranged in the hot-blast stove and used for detecting pressure and temperature in the hot-blast stove; the flue header pipe is communicated with the hot blast stove, and a flue valve is arranged on the flue header pipe; when the flue valve is opened, waste gas in the hot blast stove is discharged; the input end and the output end of the waste heat recovery module are communicated through a bypass pipeline, and a bypass valve is arranged between the input end and the output end; the quick-opening valve is arranged on the flue header pipe; the input end of the flue gas induced draft fan is communicated with the output end of the waste heat recovery module, and the output end is communicated with the chimney; waste gas in the hot-blast stove is led out; the control module is used for adjusting the opening degrees of the flue valve, the bypass valve and the quick-opening valve and the frequency of the smoke induced draft fan according to the pressure and the temperature, and then the negative pressure value in the hot-blast stove is adjusted. The negative pressure adjusting effect of the hot blast stove is improved.

The invention provides a hot blast stove system energy-saving control method based on multi-parameter cooperative control. Firstly, parameters such as waste gas temperature, furnace top temperature, waste gas oxygen content and coal gas flow are collected through sensors, real-time data are input into a cooperative control module, an optimal waste gas temperature rise curve is fitted through a pre-trained deep neural network model, and an initial opening instruction of an air and coal gas regulating valve is calculated in combination with a multiple linear regression model. And then a parameter self-adaptive PID controller is used for dynamically adjusting parameters according to the real-time temperature deviation, a final control instruction is generated and executed, and effective regulation and control of waste gas and the vault temperature are achieved. The system can intelligently decide to increase or decrease the air or gas amount, optimize the combustion efficiency, reduce the gas consumption and prolong the service life of equipment. The method breaks through the limitation that control only depends on the optimal air-fuel ratio traditionally, a gas energy-saving scheme based on the waste gas temperature rise curve is provided, the method is suitable for a hot blast stove system in the metallurgical industry, and it is expected that gas consumption can be reduced by 3%-15%.

The present invention discloses a balancing device and maintenance method suitable for hot air ducts, wherein the balancing device comprises a horizontal pipe, a vertical pipe and an end pipe connecting the horizontal pipe and the vertical pipe, wherein a pipe compensator is installed between the end pipe and the horizontal pipe; a terminal pipe which is not connected to the vertical pipe is installed on the side of the vertical pipe away from the horizontal pipe, wherein the terminal pipe has a terminal compensator, and the horizontal pipe and the terminal pipe are connected by a tie rod, wherein the pipe compensator and the terminal compensator are both within the length range of the tie rod. The present application installs a pipe compensator between the end pipe and the horizontal pipe to absorb the expansion within the length range of the end pipe and the horizontal pipe, and installs a terminal compensator on the end pipe to absorb the expansion of the tie rod to ensure the balance of the hot air duct, wherein the device has a simple and compact structure, requires little investment, and is safe and reliable.

The invention discloses a hot blast stove valve hydraulic control system and method and a blast furnace air supply system. The technical problems that in the prior art, a blast furnace hydraulic control system is short in service life, and energy waste is likely to be caused are solved. The hot blast stove valve hydraulic control system comprises a main oil supply device, a high-pressure energy accumulator set device, a low-pressure energy accumulator set device and a hydraulic cylinder. The working pressure of the high-pressure energy accumulator set device is larger than that of the low-pressure energy accumulator set device. The number of the hydraulic cylinders is the same as that of valves of the hot blast stove, the telescopic end of each hydraulic cylinder is connected to the corresponding valve so that the corresponding valve can be opened or closed, and rodless cavities of the hydraulic cylinders can be communicated with at least one of the main oil supply device, the high-pressure energy accumulator set device and the low-pressure energy accumulator set device in a switchable mode. And a rod cavity of the hydraulic cylinder is communicated with the main oil supply device. And a relatively energy-saving mode can be selected according to the characteristics of the valves in the blast furnace to control the opening and closing of the related valves through the hydraulic system, so that the aim of saving energy is fulfilled.

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.

The utility model relates to the technical field of hot blast stoves, and discloses a novel hot blast stove. According to the novel hot blast stove, an inner cavity assembly is connected and installed in a shell assembly, a heat preservation shell is installed at the upper end of the inner cavity assembly, an inner cylinder is installed in the heat preservation shell, heat transfer fins are connected and installed in the inner cylinder, connecting rods are installed on the inner sides of the heat transfer fins, and rotating pieces are installed at the upper ends of the connecting rods; a timing conveying assembly is installed on the right side of the upper end of the shell assembly, a containing groove is formed in the upper end of the timing conveying assembly, a valve is installed at the lower end of the containing groove, a fixing frame is fixed to the upper end of the containing groove, a controller is installed at the upper end of the fixing frame, and a timer is installed at the lower end of the controller. The problem that the follow-up furnace temperature tends to slide down due to the fact that the hot blast stove is used during air supply of the blast furnace and the hot blast stove is stuffy for a long time during damping down and then the air temperature is lower than the normal level after reblowing is effectively solved.

According to the flue gas utilization system of the hot blast stove, the flue gas of the hot blast stove is utilized, so that the situation that pulverization and pulverized coal conveying are affected when nitrogen in a factory is insufficient is avoided. The flue gas utilization system of the hot blast stove comprises a coal injection module used for pulverizing and conveying pulverized coal and a flue gas pipeline communicated with a flue at the tail of the hot blast stove, the coal injection module comprises a flue gas collecting piece and a pressurizing assembly, and the flue gas pipeline is directly or indirectly communicated with a first sub-pipe; the other end of the first sub-pipe is communicated with the flue gas collecting piece, and the first sub-pipe is further provided with the pressurizing assembly. The mode that nitrogen is used for the coal injection system is replaced by the process of pressurizing the flue gas exhausted by the hot blast stove, the energy utilization efficiency is improved, and the situation that the coal injection system is affected when the nitrogen is insufficient can be avoided.

The utility model relates to the technical field of heating devices, and discloses an energy-saving heating device which comprises a heating furnace mechanism, a waste heat treatment mechanism is fixedly arranged at the upper end of the heating furnace mechanism, a smoke treatment mechanism is fixedly arranged on one side of the waste heat treatment mechanism through threads, and the heating furnace mechanism comprises a heating furnace body. An efficient plate heat exchanger is fixedly arranged in the heating furnace body, guide plates are fixedly arranged on one side of the inner bottom face and one side of the inner top face of the heating furnace body, and the waste heat treatment mechanism comprises a heat preservation water tank. According to the device, a tube type heat exchanger in the heating furnace is replaced by the efficient plate type heat exchanger, high energy efficiency and low smoke exhaust temperature can be achieved, energy conservation and environmental protection are facilitated, the device is further provided with the waste heat treatment mechanism, after air is heated, residual gas with waste heat enters the waste heat treatment mechanism to be subjected to secondary heat exchange treatment, and the heat exchange efficiency is improved. And the waste heat utilization rate is increased, and resources are saved conveniently.

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 utility model discloses a hot blast stove hot blast valve drain outlet water leakage inspection structure, a first branch pipe with two open ends is installed below a drain outlet, a first valve is installed on the first branch pipe, the first branch pipe is provided with a front end and a rear end, the front end is communicated with the drain outlet, the rear end is bent to form an L-shaped bending part, and the first valve is installed on the first branch pipe. The bending part is connected with a second branch pipe with openings in the two ends, the second branch pipe is obliquely arranged downwards relative to the horizontal plane, a second valve is installed on the side, close to the bending part, of the second branch pipe, and a third valve is installed on the side, away from the bending part, of the second branch pipe; a water collecting space is formed between the second valve and the third valve, and a third branch pipe with the two ends open is installed at the end, away from the bent part, of the second branch pipe. The device is simple in structure, easy to operate and high in troubleshooting efficiency.

The invention discloses a pressurizing control system of a blast furnace hot blast stove, which comprises an air compressor assembly, a gas storage assembly, a first-stage pressure regulating valve group, a second-stage pressure regulating valve group and a self-pressurizing pipeline, and is characterized in that the air compressor assembly provides independent compressed gas for the hot blast stove; the problem that cold air of a blast furnace blower is not evenly distributed in the pressurizing process is avoided, it is ensured that the amount of cold air entering other air supply hot blast stoves is stable, the stability of the blast furnace inlet air amount and pressure is maintained, the adverse effect on the blast furnace condition is reduced, a stable air source is provided for hot blast stove pressurizing through the air storage assembly, and the buffering effect is achieved in the pressurizing process; the influence of air source pressure fluctuation on the pressurizing effect of the hot blast stove is avoided, the stability of the pressurizing process is ensured, and dual control over the on-off state and the flow state of compressed air is achieved through the first-stage pressure regulating valve set and the second-stage pressure regulating valve set. The internal pressure of the hot-blast stove is more accurately matched with the pressure of the blast furnace air supply pipeline, and the interference on the stability of air flow in the blast furnace is further reduced.

The invention relates to a method for reducing combustion gas consumption of a blast furnace hot blast stove, which comprises the following steps: S1, after the hot blast stove is converted from air supply to combustion, firstly, quickly increasing the temperature of a vault according to a specified gradient, and after ignition with smaller gas and air flows, gradually increasing the gas flow and the air flow to achieve the optimal flow required by normal combustion; s2, the coal gas flow and the air flow are adjusted, the air-fuel ratio reaches 1.05, and the vault temperature continues to rise; and S3, after the temperature of the vault reaches 1370 DEG C, the air-fuel ratio is adjusted again, and in combination with the change of the temperature of the flue, when the temperature of the flue is about 360-400 DEG C, the coal gas consumption is started to be reduced, meanwhile, it is guaranteed that the temperature of the vault is maintained at 1320-1400 DEG C, and when the temperature of the flue is increased by 8-12 DEG C, the coal gas amount is continuously reduced until furnace burning is finished. Gas combustion efficiency and hot-blast stove heat efficiency can be improved, so that gas usage amount of the hot-blast stove is saved, ironmaking cost is reduced, economic benefits are improved, and environmental pollution is reduced.

This invention relates to a blast furnace hot blast stove shell assembly device, comprising a platform base, with each arc-shaped shell plate disposed on the outer edge of the platform base. Each arc-shaped shell plate has a shell locator on its inner side, and the shell locator includes several fixing devices, fixed to an upper slot fixed to the upper edge of the shell plate and a lower slot fixed to the lower edge of the shell plate. An oblique telescopic bolt is connected to the inner side of the upper slot; a horizontal telescopic screw is connected to the inner side of the lower slot; the other ends of the oblique and horizontal telescopic screws are connected to the fixing devices. The invention also provides a construction method for assembling the blast furnace hot blast stove shell using the above-mentioned blast furnace hot blast stove shell assembly device. The fixing devices are fixed to the platform base, the shell plates are placed on the platform base according to the positioning lines, the shell locators are installed, and the lengths of the horizontal and oblique telescopic screws are adjusted to support the lower and upper openings of the shell to the radius required by the drawings. This invention facilitates adjustment of the shell roundness, allows for rapid alignment of each arc-shaped shell plate, and does not damage the shell base material.

A heat preservation smelting blast furnace air supply device comprises a furnace body, a tuyere sleeve is arranged on the furnace body, an air supply mechanism is installed in an air supply outlet and comprises an air supply pipe, a telescopic piece is installed at the top end of the air supply pipe, and an inner heat preservation mechanism and an outer heat preservation mechanism are installed at the end, close to the tuyere sleeve, of the air supply pipe. The inner heat preservation mechanism and the outer heat preservation mechanism are arranged between the furnace body tuyere sleeve and the blast pipe, installation holes are formed in the two sides of the sealing baffle, positioning pins are arranged in the installation holes, and the positioning pins penetrate through the sealing baffle to be installed outside the tuyere sleeve. A sealing baffle and a fireproof layer in the outer heat preservation mechanism are fixedly installed through a positioning pin to conduct external leakage-proof sealing treatment on the tuyere sleeve, the inner heat preservation mechanism can achieve further sealing in the tuyere sleeve through cooperation of a fireproof plate and two sets of sealing blocks when an air supply pipe stretches in, it is guaranteed that the temperature in the blast furnace is not leaked, and the heat preservation effect is improved.

The utility model discloses a hot-blast stove with a preheating air return system. The hot-blast stove comprises a burner and a hot-blast stove body, the combustor is connected with a fuel gas assembly and a combustion-supporting air assembly; the combustion-supporting air assembly comprises a combustion-supporting fan, a combustion-supporting air pipeline and a preheating air return pipeline; an air inlet of the combustion fan comprises a normal-temperature air inlet and a return air inlet; one end of the preheating air return pipeline is connected with the hot-blast stove body, and the other end is connected with the air return inlet; and an air outlet of the combustion-supporting fan is connected with the combustor through a combustion-supporting air pipeline. After hot smoke returned through the preheating air return pipeline is mixed with low-temperature air, the temperature of combustion-supporting air fed into the combustor through the combustion-supporting fan is far higher than that of the low-temperature air (30-50 DEG C), combustion can be more stable through the combustion-supporting air with the higher temperature, the flameout frequency in the operation process is reduced, and the reliability of the whole system is improved.

An energy storage system (TES) converts variable renewable electricity (VRE) to continuous heat at over 900° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. The delivered heat which may be used for processes including power generation and cogeneration. In one application, thermal energy storage systems are used to improve efficiency and reduce carbon emissions associated with processing materials or other industrial applications.

The present invention relates to a columnar flow multi-vortex low-nitrogen burner, which can effectively solve the problems of uneven gas mixing, insufficient combustion, unstable air flow, low combustion intensity, spalling, fracture and displacement of the gas nozzle bricks in the prior art. The technical solution adopted is that the burner body is composed of an arc-shaped wall in the lower half of the vault and a straight wall connected below the vault. An air inlet pipe is arranged on the outer side wall of the arc-shaped wall in the lower half of the vault, and an air annular channel is arranged inside the arc-shaped wall. A gas inlet pipe is arranged on the outer side wall of the straight wall below the vault, and a gas annular channel is arranged inside the straight wall. Air distribution channels are arranged vertically and evenly along the circumferential direction on the inner side wall of the gas annular channel. The present invention can make the gas mixing uniform, the combustion sufficient, the air flow stable, and the combustion intensity high. The air and gas are arranged in a columnar flow and staggered in two annular channels, so that the air flow mixing effect is better, which is an innovation on the burner.

The invention discloses a blast furnace system and a control method thereof. The blast furnace system comprises a blast furnace; the dust removal cover covers the blast furnace, and a dust removal pipeline is connected to the dust removal cover; the water slag flushing white elimination cover is connected with the dust removal pipeline through a steam pipeline, and a steam valve is arranged on the steam pipeline; an inlet of the dust removal assembly is connected with the dust removal cover through a dust removal pipeline, an outlet of the dust removal assembly is connected with an exhaust pipeline, and a dust detection device and a dust removal fan are arranged on the exhaust pipeline; an inlet of the dust removal chimney is connected with the exhaust pipeline; the hot-blast stove is connected with the blast furnace through a hot-blast pipeline, and a combustion-supporting air port of the hot-blast stove is connected with an air outlet of the dedusting chimney through a combustion-supporting air pipeline; the combustion-supporting fan is arranged on the combustion-supporting air pipeline; and the controller is electrically connected with the dust detection device and the steam valve, and the controller is configured to control the opening degree of the steam valve according to the dust content. The heat energy utilization rate is greatly improved and the energy consumption of the whole blast furnace system is reduced.

The invention discloses a blast furnace hot blast stove changing air pressure monitoring automatic error correction method and device, and belongs to the field of automatic control. The blast furnace air supply pressure of a hot air header pipe is monitored and recorded, when the hot blast stove needs to exhaust air and relieve pressure from the air supply state to the combustion state, the normal blast furnace air pressure value 20 seconds before the air supply state to the combustion state of the hot blast stove is taken as a reference value, and the actual air pressure value in the switching process from the air supply state to the combustion state of the hot blast stove is monitored in the whole process; continuously comparing the two values; when it is found that the air supply air pressure is instantaneously and greatly reduced, the furnace changing program is automatically terminated, an exhaust valve closing instruction is sent out, air exhausting of the hot blast stove is stopped, pressure relief of the hot blast stove is terminated, and then monitoring and automatic error correction of the blast furnace hot blast stove furnace changing air pressure are achieved; during production of the blast furnace, stable air pressure switching is achieved when a fault occurs in furnace changing of the hot blast furnace, the response speed is greatly increased, and the possible problems of misjudgment and missed judgment are avoided.

The high-temperature thermocouple fixing structure comprises a hot-blast stove main pipe, a hot-blast stove pipe shell is arranged on the periphery of the hot-blast stove main pipe, an isolation space is arranged along the circumference of the hot-blast stove pipe shell in an outward protruding mode, and a mounting structure used for fixing a thermocouple is arranged inside / outside the isolation space. A first sleeve structure layer is arranged in the installation structure, a second sleeve structure layer is arranged in the vertical direction of the first sleeve structure layer in a splicing mode, the first sleeve structure layer and the second sleeve structure layer are coaxially arranged, thermocouples are arranged in the first sleeve structure layer and the second sleeve structure layer, and the thermocouples are arranged in the first sleeve structure layer and the second sleeve structure layer. The thermocouple extends into the hot-blast stove main pipe, the isolation spaces on the hot-blast stove main pipe are arranged at intervals, thermocouple temperature measuring points are arranged at the positions of the isolation spaces according to different depths, the isolation spaces are of hollow structures protruding out of the hot-blast stove main pipe, and installation structures are arranged in the isolation spaces in a fixed mode.

The invention provides a system for supplying combustion-supporting air to a hot-blast stove through an anti-surge valve of an air blower, and belongs to the field of ferrous metallurgy energy utilization. According to the system, an air supply pipeline is led out behind an anti-surge valve and in front of a blow-off valve and laid to an outlet of an air heat exchanger of a hot blast stove system, and the purpose is to secondarily utilize high-temperature oxygen-enriched air discharged in order to prevent surge of an air blower, so that the high-temperature oxygen-enriched air participates in combustion of coal gas in the hot blast stove. During daily blast furnace operation, the anti-surge valve can be regulated and controlled according to the air condition in the furnace, so that high-temperature oxygen-enriched air participates in gas combustion of the hot blast furnace. The technology effectively reduces the frequency of a combustion fan, reduces the energy consumption, improves the efficiency of the hot blast stove, reduces the emission of pollutants such as residual carbon monoxide and nitrogen oxides, optimizes the collaborative operation between the blast furnace and the hot blast stove system, improves the energy utilization rate and environmental protection benefits of the whole ferrous metallurgy production process, and improves the economic benefit. And an effective technical solution is provided for energy conservation and emission reduction in the iron and steel industry.

The present invention relates to a method for ventilating a hydrogen-enriched and carbon-circulating oxygen blast furnace during a long period of ventilating shutdown. Before ventilating shutdown, the ventilating mode is switched from a mixed gas ventilating mode of hot coal gas, cold oxygen gas, and high-stability nitrogen gas to a mixed gas ventilating mode of hot compressed air, hot oxygen gas, and hot nitrogen gas. In the mixed gas ventilating mode of hot compressed air, hot oxygen gas, and hot nitrogen gas, after at least one smelting cycle has been operated, ventilating is stopped. At the beginning of re-ventilation, half of the tuyeres are opened and the other half are closed. During the re-ventilation process, the mixed gas ventilating mode of hot compressed air, hot oxygen gas, and hot nitrogen gas is used as the ventilating mode. When the tapping rate and stock line operation are normal and the number of open tuyeres accounts for 80% or more of the total number of tuyeres, the ventilating mode is switched from a mixed gas ventilating mode of hot compressed air, hot oxygen gas, and hot nitrogen gas to a mixed gas ventilating mode of hot coal gas, cold oxygen gas, and high-stability nitrogen gas. This method solves the problems that after a long period of cessation of blowing in a hydrogen-enriched and carbon-circulating oxygen blast furnace, the dead area at the tuyere is difficult to restore, the restoration speed is slow, the restoration process is likely to be repeated, and the blower at the tuyere is likely to be burned out, which makes it easy for furnace cooling accidents to occur.

The invention discloses a double-mother-pipe blast furnace air distribution method which comprises the following steps: when a signal indicating normal operation of any unit is received, the unit is controlled to enter fan interlocking input, and the state of the unit is latched by a first register; and when receiving signals that any one electric air dispensation valve is closed in place, the pneumatic air dispensation valve is closed in place, the pressure of the two blast furnace air pipe mother pipes is greater than preset pressure and any two units are in fan interlocking input, latching a judgment result through a second register, and sending an air dispensation system trial input permission operation signal to a control end. When a certain unit breaks down or is abnormal, a standby unit can be rapidly and accurately started or other emergency measures can be taken, the air distribution logic and flow can effectively reduce misoperation or rejection of an air distribution system caused by error signals, the operation stability of the blast furnace is improved, slag filling accidents of the blast furnace are avoided, and the service life of the blast furnace is prolonged. And production interruption and safety accidents are avoided.

The invention discloses an automatic furnace changing air supply control method and system for hot blast stoves, the control method adopts a mode that four hot blast stoves carry out two-burning and two-supply complete cross parallel connection to supply air into the blast stoves, and the control method comprises the following steps: a state judgment step; an air supply control step; an air temperature adjusting step; a state switching step; wherein a heating pipe with the preset length is arranged in the hot air main pipe, the heating pipe keeps the temperature at the target air temperature in an electric heating mode, and in the air temperature adjusting step, first hot air output by the first hot air furnace and second hot air output by the second hot air furnace are mixed in the hot air main pipe; and the mixed hot air flows through the heating pipe and then is conveyed into the blast furnace. According to the scheme, the air temperature in the hot air header pipe can be adjusted in real time, and hysteresis is reduced.

An instrumented plate for monitoring a refractory section of a furnace, the instrumented plate comprising: - a support plate (310) through which a plurality of orifices (304) pass, and at least partially made of a material consisting of fibers bonded together by a ceramic matrix, called a "ceramic matrix composite," or made of a precursor of said ceramic matrix composite; - a sensor (312) carried by said support plate, a precursor of a ceramic matrix composite being a material capable of transforming into said ceramic matrix composite under the effect of heating. Abbreviated figure: 3