97results about "Heating stoves" patented technology

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 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%.

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 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 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 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 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

The application discloses a castable for hot-state repair of hot blast stove and application thereof, and the castable is composed of the following components in percentage by mass: fused mullite 50-60%, dense corundum powder 22-32%, alpha-Al2O3 micro powder 5-10%, submicron silicon micro powder 2-5%, perlite 4-7%, foaming agent 0.5-1%, and solidifying agent 0.4-1%; the mass of the above components is 100%, and 7-9% of the weight of the above components is added with silicon sol; wherein the perlite is closed perlite; and the foaming agent has a decomposition temperature of 110-160 DEG C. The castable has the advantages of high medium-high temperature strength, volume stability, effective resistance to hot blast erosion and corrosion, good heat preservation and heat insulation performance, reduced heat loss, safe and stable protection of the tube shell, and prolonged service life of the hot blast pipe network.

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 utility model relates to the technical field of energy conservation and environmental protection, in particular to an environment-friendly dust removal system for backflow damping down of a hot blast stove, which comprises a gas pipeline, a diffusing pipeline, a flow slowing device, a cooler, a flow collecting device and a dust remover. The outlet end of the cooler is communicated with the flow collecting device which is communicated with the dust remover through a pipeline, and the dust remover is connected with the diffusing pipeline through a pipeline. High-temperature raw gas generated in the backflow damping-down process of the hot-blast stove enters the cooler through the flow slowing device, the contact area of the raw gas and a cooling pipe in the cooler is increased, the flow speed is reduced, and the raw gas rapidly enters the dust remover through the flow collecting device after being cooled, is filtered by a cloth bag and rapidly enters the diffusion pipeline under the driving action of the dust removal fan; and the backflow damping-down high-temperature raw gas of the hot blast stove can be quickly discharged after being filtered and purified, and the adverse effect on the environment caused by direct discharge of the raw gas is relieved.

This utility model discloses a blast furnace hot blast stove cooling water system based on a closed-loop soft water circulation system, including a blast furnace cooling module and a hot blast stove cooling module. The blast furnace cooling module, from the cooling wall outlet to the inlet of the blast furnace body, sequentially includes a main water collection pipe, a degassing tank, an expansion tank, an air cooler, a soft water pump, and a main measuring component. The hot blast stove cooling module, along the soft water flow direction, sequentially includes a main inlet valve, an automatic interlocking pump assembly, a primary measuring component, a cooling submodule, another primary measuring component, and a main outlet valve. The main inlet valve connects the main measuring component and the cooling wall inlet of the blast furnace body, and the main outlet valve is connected to the outlet end of the main water collection pipe via a return water pipe. The cooling submodule includes multiple cooling units connected in parallel. This system effectively improves the water quality of the hot blast stove cooling water, reduces scaling and corrosion rates, and avoids the impact of equipment replacement on production.

The invention belongs to the technical field of hot air pipeline equipment, and particularly relates to a hot air pipeline pull rod device with a compensation function, which comprises a first seat ring, a second seat ring and a third seat ring, the second seat ring is fixed on the outer wall, far away from the blind end, of the hot air pipeline; the compensation mechanism is fixed to the end face, close to the blind end of the hot air pipeline, of the first seat ring. The axis direction of the pull rods is parallel to the axis direction of the hot air pipeline, the pull rods are evenly arranged outside the hot air pipeline in the circumferential direction of the hot air pipeline and sequentially penetrate through the compensation mechanism, the first seat ring and the second seat ring, and the two ends of the pull rods are correspondingly connected with the compensation mechanism and the second seat ring. The problems that an existing compensator is complex in construction technology, pipeline integrity is damaged, the engineering cost is high, and the structural complexity of a hot air pipeline system is increased are solved.

The invention discloses a blast furnace blower drying maintenance system using air source back flushing and a method thereof. The blast furnace blower drying maintenance system comprises a main fan, a standby fan, an air inlet pipe, a reversing valve I, a first air outlet pipe, a second air outlet pipe, a delivery header pipe and a reversing valve II. The reversing valve I and the reversing valve II are two-position three-way electromagnetic reversing valves, the air inlet pipe is communicated with an air inlet P of the reversing valve I, a working port A of the reversing valve I is communicated with an air inlet of the main fan, and a working port B of the reversing valve I is communicated with an air inlet of the standby fan; an air outlet of the main fan communicates with the delivery header pipe through a first air outlet pipe, and an air outlet of the standby fan communicates with the delivery header pipe through a second air outlet pipe; an air inlet P of the reversing valve II is communicated with the delivery header pipe, a working port A of the reversing valve II is communicated with an air outlet of the standby fan through a pipeline, and a working port B of the reversing valve II is communicated with an air outlet of the main fan through a pipeline. The anti-rust maintenance can be completed on the premise of not starting or switching the standby fan, and the continuity and stability of the blast furnace smelting process are guaranteed.

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 the technical field of ironmaking processes, in particular to a method for controlling the content of nitric oxide in exhaust gas of a hot blast stove. The method comprises the following steps: S1, when the hot-blast stove burns, the gas flow of a single stove is less than or equal to 150,000 / h, and the total flow is less than or equal to 600,000 / h when two stoves are simultaneously burnt; s2, adjusting the flow of combustion air and gas, and controlling the vault temperature to be less than or equal to 1350 DEG C; and S3, adjusting the frequency of an induced draft fan according to the amount of flue gas in the furnace, and stabilizing the negative pressure to be-0.2 to-0.5 kPa. According to the method, denitration equipment such as SCR (Selective Catalytic Reduction) and SNCR (Selective Non-Catalytic Reduction) does not need to be additionally arranged, fuel type nitrogen oxide is reduced by controlling the gas flow, thermal type nitrogen oxide under high temperature and high oxygen is prevented from being generated massively by controlling the vault temperature, the nitrogen oxide can be reduced from 220-260mg / N to be less than or equal to 180mg / N under the condition of meeting the high blast temperature requirement of the blast furnace, the national ultralow emission requirement is met, and the investment and operation and maintenance cost of the denitration equipment is reduced.

The invention belongs to the technical field of metallurgical equipment control, and particularly provides a heat storage control method for an internal combustion hot blast stove, which comprises the following steps: acquiring the pressure of a first header pipe in a gas delivery pipeline of the internal combustion hot blast stove; according to the first main pipe pressure, the second main pipe pressure in a combustion air conveying pipeline of the internal combustion hot blast stove is adjusted; according to the lattice brick specification of the internal combustion hot blast stove and the process parameters of the internal combustion hot blast stove, the critical flue gas flow of the internal combustion hot blast stove is determined; according to the technological parameters, the total furnace burning time of the internal combustion type hot blast stove is determined, and the total furnace burning time is divided into a turbulent flow time period and a laminar flow time period based on the periodic heat storage amount and the heat storage time of the internal combustion type hot blast stove; and controlling the flow of flue gas flowing through the checker bricks according to the time period of the internal combustion hot blast stove and the critical flue gas flow. According to the technical scheme, the heat storage efficiency of the internal combustion type hot blast stove can be improved.

The present invention relates to a method for operating a blast furnace plant (1) including a blast furnace (10), at least one material hopper (20) having an upper seal valve (21) and a lower seal valve (22) for charging raw materials into the blast furnace (10), and at least one hot stove (30) for generating hot air for the blast furnace (10), the method including at least one charging cycle including the steps of opening the upper seal valve (21), introducing raw materials into the material hopper (20), closing the upper seal valve (21), equalizing the pressure between the material hopper and the top of the blast furnace, and opening the lower seal valve (22) to discharge the raw materials into the blast furnace (10). In order to provide a cost-effective method for minimizing the risk of explosion during operation of a top charging system, the present invention allows for the transfer of off-gas from at least one hot stove (30) by a transfer system (40) to at least one material hopper (20) and for the off-gas to be injected into the material hopper (20) before the bottom seal valve (22) is opened.

The invention belongs to the technical field of metallurgy, and particularly relates to a signal interference prevention method for automatic burning of a metallurgy hot blast stove. Comprising the following steps: S1, collecting an analog quantity signal of a field instrument, and converting the analog quantity signal into an engineering value; s2, judging whether the engineering value is in a preset normal working range or not; s3, if the engineering value is within the normal working range, outputting the engineering value for control; s4, if the engineering value exceeds the normal working range, starting a multi-dimensional interference judgment process; and S5, executing a corresponding output strategy according to a multi-dimensional judgment result. According to the method, by combining two-dimensional criteria of'time window restorative monitoring 'and'fluctuation characteristic mode matching' and introducing'multi-signal cooperative verification ', instantaneous interference and real abnormity can be distinguished at extremely high precision, and the misjudgment rate is greatly reduced.

The invention discloses an ultrahigh-temperature zinc-corrosion-resistant silicon carbide-based spraying material and a thermal-state online construction process, the material is prepared by taking 60-80 wt% of silicon carbide as a matrix, adding 10-20 wt% of a zinc-corrosion-resistant modifier, 5-15 wt% of a high-temperature binder and 2-10 wt% of a nano auxiliary agent, and carrying out wet ball milling, vacuum drying and screening, and the particle size is 20-50 [mu] m. According to the construction technology, a plasma spraying technology is adopted, high-temperature pretreatment, dynamic cooling and high-temperature annealing are combined, and non-stop construction at the operating temperature of 800-1200 DEG C is achieved. The service life of the coating in a liquid zinc environment at 1400-1450 DEG C exceeds 1000 hours, the bonding strength is 20-30 MPa, and the thermal shock resistance supports 50-70 times of thermal cycles without cracks. The method is suitable for protecting high-temperature equipment such as blast furnaces, hot blast stoves and zinc liquid containers, the construction efficiency is improved by 50%, the maintenance cost is reduced by about 30%, and remarkable economic benefits and social benefits are achieved.

The invention belongs to the technical field of energy conservation in the iron and steel industry, and particularly relates to a system and method for improving heat exchange of an internal combustion hot blast stove through flue gas reuse. Comprising hot-blast stoves, smoke exhaust branch pipes, a smoke exhaust header pipe and a chimney, hot air pipelines of the hot-blast stoves are connected with blast furnaces, each hot-blast stove is connected with the smoke exhaust header pipe through the corresponding smoke exhaust branch pipe, and the smoke exhaust header pipe is connected with the chimney; a regulating valve and a check valve are arranged on the smoke exhaust branch pipe, a smoke recycling pipeline is led out between the regulating valve and the check valve, the smoke recycling pipeline is connected into the hot-blast stove, the connecting position is above the gas pipeline and the combustion-supporting air pipeline, and the smoke recycling pipeline is bent upwards to be the same as the flame direction after being connected into the hot-blast stove. The check valve is close to one side of the smoke exhaust header pipe. The problem that convective heat transfer of checker bricks of the hot blast stove is weakened due to reduction of the smoke amount in the arch crown heat preservation and heating stage of the internal combustion type hot blast stove is solved through smoke recycling, and the hot air temperature can be effectively increased by 5 DEG C or above.

The present application relates to blast furnace hot blast stove technical field, more specifically, relate to a kind of blast furnace hot blast stove change furnace control system, for solving the problem that prior art cannot realize dynamic adaptation to different working conditions, cannot adjust change furnace strategy in time, increase change furnace cost, cannot guarantee the stable operation of blast furnace;The present application utilizes reinforcement learning algorithm by change furnace optimization control module, based on smelting state and blast pressure prediction, provides intelligent decision support, realizes dynamic adaptation to different working conditions by defining state space and change furnace action, and combining reward function to comprehensively consider efficiency, cost and stability, this module improves smelting efficiency, reduces change furnace cost, guarantees the stable operation of blast furnace, optimizes strategy using historical data, responds to environmental changes in real time, adjusts change furnace strategy in time, ensures production continuity and safety.

The invention discloses an efficient disassembly and assembly method for a blast furnace baking guide pipe, and belongs to the technical field of blast furnace in-furnace baking pipeline assembly and disassembly. The method comprises the steps of material selection and component prefabrication, conduit module BIM modeling and pre-division, module prefabrication and transportation, platform module installation, gradual installation and fixation of pipe sections, sealed connection and system recheck, and conduit removal. The method has the advantages that through the modular design and the BIM technology, rapid assembly, disassembly and cyclic utilization of the pipeline are achieved. The modular pipelines are prefabricated outside the blast furnace, the vertical pipelines are annularly supported through steel bars, and the horizontal pipelines are connected with the octagonal platform through sleeves. The octagonal platform is convenient to transport and assemble due to the modular design, and a construction supporting function is provided. The welding amount is remarkably reduced through flange connection, welding points are reduced by 85%, and the dismounting and mounting efficiency is improved by 70%. All operations are controlled within 2 meters, an all-round scaffold is not needed, and the risk of high-altitude operation is reduced. The installation period is shortened from 56 hours to 30 hours, and the dismantling time is shortened from 24 hours to 16 hours.

The utility model provides a multifunctional lining die for an iron-making blast furnace air supply pipe, and belongs to the technical field of substrate pouring auxiliary devices. In the multifunctional lining mold for the blast pipe of the iron-making blast furnace, a lifting piece is arranged at one end of a demolding column, and the radial size of one end of the demolding column is larger than that of the other end of the demolding column; one end of each first mold column can be detachably connected with the other end of the demolding column, the other end of each first mold column can be detachably connected with one end of the other first mold column, and the radial sizes of the first mold columns in any position in the axial direction are the same; the radial size of one end of the second mold column is larger than that of the other end of the second mold column, and one end of the second mold column can be detachably connected with the other end of the demolding column; the radial size of one end of the third die column is equal to the radial size of the other end of the second die column and larger than the radial size of the other end of the third die column, and one end of the third die column can be detachably connected with the other end of the second die column. According to the utility model, the convenience of lining the blast pipe of the iron-making blast furnace can be effectively improved.

The invention belongs to the technical field of low-carbon ironmaking, and particularly discloses a method for treating static pressure fluctuation of a furnace body of a hydrogen-rich carbon circulating oxygen blast furnace. According to the method, specific-layout static pressure monitoring points are arranged from the position above a tuyere of the hydrogen-rich carbon circulating oxygen blast furnace to a furnace top charge level, and resistance loss differential pressure values and data deviations of different areas in the furnace are accurately detected, so that the resistance loss condition of a soft melting zone in the furnace and the distribution uniformity of coal gas flow are judged. Aiming at different monitoring results and different smelting stages (a low productivity stage, an air supply blow-in initial stage, a normal operation period and the like) of the blast furnace, the problem of static pressure fluctuation of a furnace body is effectively solved by adjusting an ore blending structure, the performance of a fuel structure, air supply parameters, various gas injection proportions and the like, and low-carbon, efficient and stable operation of the hydrogen-rich carbon circulating oxygen blast furnace is realized. Reliable technical support is provided for stable production of the hydrogen-rich carbon circulating oxygen blast furnace, and the method has remarkable industrial application value.

The invention relates to an online repair construction method for a hot blast branch pipe of a hot blast stove. The method comprises the following steps: damping down the hot blast stove connected with the hot blast branch pipe to be repaired; a hot air valve at the joint of the hot air branch pipe to be repaired and the hot air main pipe side branch pipe is removed, and a primary heat insulation blocking plate is installed on the hot air main pipe side branch pipe; a heat insulation wall is built on the to-be-repaired hot air branch pipe close to the hot air outlet of the air mixing chamber; dismantling the primary heat insulation plugging plate, and installing a simulation hot blast valve; the hot air branch pipe to be repaired is dismantled, and a new hot air branch pipe is installed; dismounting the simulation hot blast valve, and installing a secondary heat insulation plugging plate; the heat insulation wall and the secondary heat insulation plugging plate are removed, and a formal hot air valve is installed at the joint of the new hot air branch pipe and the hot air main pipe side branch pipe; by means of the arrangement, the hot air branch pipe can be repaired in a short time to meet the production condition while the high-temperature and stable state of the hot blast stove is maintained, the construction period is shortened while construction safety is ensured, and the construction efficiency of the hot blast stove is improved.

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a HyCROF blast furnace injection gas adjusting system which comprises a blast furnace and a PLC, the air inlet end of the blast furnace communicates with a tuyere small sleeve and communicates with a hot blast stove through the tuyere small sleeve, and a dust removal system and a decarburization system are connected to the blast furnace in series. A gas inlet valve, a filter, an outlet valve, a flow meter and a pressurizing machine are connected in series with an outlet of the decarburization system and the coke oven gas pipe, the pressurizing machine is communicated with the hot blast stove, and the flow meter is electrically connected with the PLC. In order to solve the problem of low reduction reaction efficiency in a furnace caused by oxygen-coal ratio imbalance due to gas composition and flow fluctuation in a traditional blast furnace ironmaking system, the method comprises the following steps: detecting the flow of decarburized gas and coke oven gas in real time, calculating the oxygen supply amount of theoretical mixed gas and adjusting the opening degree of an oxygen valve; therefore, the problems of low reduction reaction efficiency and high energy consumption in the furnace caused by deviation between the pressure, the flow and the components of the hot coal gas injected by the tuyere small sleeve and the actual demand quantity are solved.

The application discloses a kind of internal combustion hot blast stove internal refractory quick dismantling method, is set in the outside of hot blast stove body discharge pipe, discharge pipe is communicated fire well;Second through hole is opened in the hot blast stove body, first excavator is hoisted into the inside of hot blast stove body from second through hole, and make first excavator be located at the top of regenerative chamber of hot blast stove body, make first excavator from top to bottom dismantle the refractory material in the inside of hot blast stove body, the height of first excavator gradually reduces with the progress of dismantling operation, when the operating height of first excavator is reduced to flush with first through hole, third through hole is set in the bottom of hot blast stove body, vertical discharge passage is excavated on the remaining regenerative chamber, and make discharge passage with third through hole communication;Refractory material is discharged through discharge passage and third through hole.Utilize the strong advantage of excavator dismantling, high efficiency is quickly dismantled to all refractory material in the inside of hot blast stove body, compared with traditional construction manual dismantling, safety factor is high, efficiency is high, short construction period.

The present application relates to the technical field of iron-making process, and is a hot blast stove combustion heat value control device and method based on flue gas back mixing. The device is applied to a hot blast stove and comprises a flue gas back mixing system and an intelligent control system. The flue gas back mixing system controls the combustion heat value in the hot blast stove within the bearing range of the refractory material of the hot blast stove by reversely mixing the flue gas generated by combustion in the hot blast stove into the coke oven gas. The intelligent control system is used to control the flow of combustion-supporting air, coke oven gas and blast furnace gas into the hot blast stove. The present application mixes the flue gas generated by combustion in the hot blast stove into the coke oven gas for combustion in the hot blast stove, controls the heat value of the combustion in the hot blast stove within a reasonable range, matches the combustion temperature with the bearing capacity of the refractory material of the hot blast stove, improves the air temperature, reduces the emission, and balances the overall coke oven gas amount in the plant.