50results 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.

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 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 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.

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 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.

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 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 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 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 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.

The invention discloses a hot blast stove combustion control method and system and a computer readable storage medium, and relates to the technical field of hot blast stoves. The control method comprises the steps that operation parameters of the hot blast stove are obtained; wherein the operation parameters comprise the current furnace burning stage, the initial air-fuel ratio, the initial air amount, the initial waste gas oxygen content, the target waste gas oxygen content, the current vault temperature, the target vault temperature, the current waste gas temperature and the target waste gas temperature; the optimal air-fuel ratio and the air quantity set value are periodically determined according to the operation parameters; according to an air quantity set value and the optimal air-fuel ratio, the opening value of an air regulating valve and the opening value of a gas regulating valve are obtained; the opening degree of the air adjusting valve is adjusted according to the opening degree value of the air adjusting valve, the opening degree of the gas adjusting valve is adjusted according to the opening degree value of the gas adjusting valve, and therefore the burning state of the hot-blast stove is dynamically adjusted. By dynamically optimizing the combustion state of the hot blast stove, the combustion efficiency of the hot blast stove is improved, and the energy consumption is reduced.

The invention relates to the technical field of blast furnace air supply systems, and one embodiment of the invention provides a blast furnace air supply system energy recovery device which comprises a hot blast stove body, and a flue gas pipe is fixedly connected to the top of the hot blast stove body. After dust-removed flue gas enters the heat exchange box, due to the design of second heat exchange plates, when the second heat exchange plates are perpendicular to the front side and the rear side of the inner surface of the heat exchange box, the flowing path length of the high-temperature flue gas in the heat exchange box can be remarkably increased, and therefore the heat exchange area is increased; according to the technical scheme, the temperature of cold air can be increased more quickly after the cold air makes contact with the first heat exchange plate, when the cold air reaches the target preheating temperature or the flue gas parameter is low, the gas path resistance can be reduced by rotating the rotating shaft, and through the technical scheme, the technical problem that in the prior art, heat exchange parts cannot be adjusted is solved.

The application discloses an automatic air distribution device for a metallurgical blast furnace, comprising: a plurality of air blowers; a plurality of blast furnaces; a plurality of cold air mother pipes; a plurality of connecting pipes; a plurality of air distribution pipes; the air distribution pipes comprise a first air distribution pipe, a second air distribution pipe and a third air distribution pipe; one end of the first air distribution pipe is connected with a first connecting pipe, and the other end is connected with a second connecting pipe; one end of the second air distribution pipe is connected with the second connecting pipe, and the other end is connected with a third connecting pipe; one end of the third air distribution pipe is connected with the first connecting pipe, and the other end is connected with the third connecting pipe; the first air distribution pipe, the second air distribution pipe and the third air distribution pipe are arranged in a triangular shape; a PLC controller; and a control assembly connected with the PLC controller. Through the triangular structure of the air distribution pipe design, when one or more air blower groups stop working due to faults, the pneumatic regulating valve group is controlled to be opened through the PLC controller, so that the corresponding blast furnace is ensured to not cause a major accident of tuyere slag filling.

The utility model relates to the field of ironmaking equipment, concretely relates to a hot blast stove inflation device, including high pressure gas holder, air compressor, dryer, gas pipeline, control system and gas holder pressure control module, air compressor is connected with the dryer, the dryer is connected with high pressure gas holder, is provided with pressure detector in high pressure gas holder, gas holder pressure control module is connected with pressure detector and air compressor, and gas pipeline is provided with flow detection instrument, is provided with pressure regulating valve group on gas pipeline, and pressure regulating valve group is connected with control system. The utility model adopts the high pressure gas holder of external to charge pressure for hot blast stove, eliminates blast fluctuation.

The utility model discloses an anti-burnthrough monitoring device for a burning furnace gas pipeline of a hot blast stove, which comprises the burning furnace gas pipeline communicated with the hot blast stove, a gas burning valve is mounted on the burning furnace gas pipeline, and a mounting hole is formed in the pipe wall of the bottom of the burning furnace gas pipeline. The installation hole is located in the side, away from the hot blast stove, of the gas combustion valve, an installation pipe is inserted into the installation hole, and a thermocouple is inserted into the installation pipe. According to the anti-burnthrough monitoring device for the burning furnace gas pipeline of the hot blast stove, the sealing problem of the gas combustion valve and the potential burnthrough risk of the burning furnace gas pipeline can be found in time by monitoring the temperature in real time, continuous erosion of high-pressure and high-temperature hot air to the burning furnace gas pipeline is avoided, and the service life of the burning furnace gas pipeline is prolonged. The burning-through accident of the burning furnace gas pipeline is effectively prevented, and safe operation of a hot blast stove system is guaranteed.

The invention discloses a blast furnace hot blast stove temperature early warning system and method based on artificial intelligence, and belongs to the technical field of hot blast stove temperature early warning, the blast furnace hot blast stove temperature early warning system comprises a temperature early warning platform, and the temperature early warning platform is in communication connection with a temperature acquisition module, a temperature analysis module, an equipment management module and a storage module used for storing system data; the temperature acquisition module is used for acquiring temperature data of the blast furnace hot blast stove and obtaining a smoke temperature value of a monitored object; the temperature analysis module is used for analyzing the exhaust gas temperature of the blast furnace hot blast stove; and the equipment management module is used for managing and analyzing equipment of the blast furnace hot blast stove. The temperature difference coefficient is obtained by comprehensively analyzing and calculating the exhaust gas temperature values of all the hot-blast stoves in the monitoring time period, the temperature abnormal degree of the hot-blast stoves in the monitoring time period is fed back through the temperature difference coefficient, early warning is conducted in time when potential safety hazards exist in exhaust gas of the hot-blast stoves, and the operation safety of hot-blast stove equipment is improved.

To provide a blast furnace operation method for blowing hydrogen gas, capable of achieving a reduction target of carbon consumption without increasing the blowing amount of hydrogen gas even when the temperature of the hydrogen gas is within a temperature range capable of warming.SOLUTION: A blast furnace operation method comprises: a first step of determining a predetermined sensible heat quantity based on a sensible heat quantity input to a blast furnace by hydrogen gas and hot air in a hydrogen blowing base dimension of a predetermined carbon consumption, where the carbon consumption quantity is reduced from the basic operation dimension by blowing hydrogen gas; a second step of generating a hydrogen gas temperature-hot air temperature correlation based on the relation between the temperature of hydrogen gas and hot air at which the sensible heat quantity input by hydrogen gas and hot air becomes a predetermined sensible heat quantity; a third step of determining a first temperature of hydrogen gas and a second temperature of hot air based on the generated hydrogen gas temperature-hot air temperature correlation; and a fourth step of blowing hydrogen gas at the determined first temperature through a tuyere and blowing hot air at the second temperature through the tuyere.SELECTED DRAWING: Figure 2

The invention belongs to the technical field of blast furnace hot blast stove safety control, and particularly relates to a blast furnace hot blast stove safety optimization method based on multi-valve cooperation, which comprises the following steps: (1) safety optimization of a gas combustion valve: 1, double valves are closed in place for interlocking protection; 2, the temperature between the valves is monitored in real time; and 3, key valve signal interlocking upgrading. (2) safety optimization and opening in-place signal dual detection of the hot blast valve; (3) safety optimization of the cold air valve and a cold air valve opening in-place signal dual verification structure; (4) multi-valve cooperative interlocking logic upgrading; and (5) test and verification: 1, signal distortion simulation test; 2, temperature alarm test; and 3, carrying out a delay verification test. According to the method, by means of double-signal series verification, temperature threshold alarm setting, delay verification and multi-link interlocking protection, misoperation caused by signal distortion is completely eradicated, immediate response is achieved, blast furnace wind interruption and slag pouring caused by false in-place opening signals are prevented, normal production is ensured, and economic losses are avoided.

The utility model belongs to the technical field of hot-blast stove equipment in iron works, and relates to a hot-blast stove combustion optimization adjusting device which comprises a hot-blast stove, an air inlet pipe is connected to the hot-blast stove, an air inlet pipe and a coal gas inlet pipe are arranged at the tail end of the air inlet pipe, and a flow adjusting valve is arranged on the air inlet pipe. An air adjusting valve and a gas adjusting valve are arranged on the air inlet pipe and the gas inlet pipe respectively, servo motors are arranged on the flow adjusting valve, the air adjusting valve and the gas adjusting valve, rotating shafts are connected to the bottoms of the servo motors, baffles are arranged on the rotating shafts, and the servo motors are connected to a PLC through data lines. Through optimal control over the air-fuel ratio and the flow, it is ensured that the furnace burning process is always in the optimal proportion burning state, gas consumption is reduced, the air supply temperature is increased, and the purposes of low carbon, energy conservation, consumption reduction and cost reduction in the ironmaking process are achieved.

The invention relates to the technical field of combustion control of blast furnace hot blast stoves, in particular to a hot blast stove gas quantity dynamic prediction and adjustment method based on periodic heat balance calculation. The method comprises the following steps: 1, determining the average heat storage capacity increment required for completing a burning furnace through heat balance calculation based on historical data; 2, after furnace burning is started, cyclically executing in a fixed period: calculating and accumulating heat storage increment in the current period, solving a difference value between an accumulated value and a target value, inquiring a preset period-heat efficiency relationship to obtain current efficiency, reversely deducing the residual required gas amount by combining a gas heat value, and finally calculating and setting target gas flow in the next period according to the residual time; and 3, repeatedly adjusting until the furnace is burnt. By means of periodic heat balance calculation and dynamic feedback adjustment, accurate matching of coal gas supply and actual requirements of the heat accumulator is achieved, so that the coal gas utilization rate is remarkably increased, the banking time is greatly shortened, the stability of burning furnace end point control is enhanced, and the purposes of energy conservation, consumption reduction and intelligent operation are achieved.

The present application belongs to the technical field of blast furnace ironmaking, and specifically discloses a coal gas heating and carbon precipitation prevention method using low-grade heat of hot blast stove for CH4 pre-decomposition. First, the low-grade heat of the hot blast stove and the relevant parameters of the blast furnace decarburization coal gas are collected, a pre-decomposition section is added at the front end of the coal gas heating device, the low-grade heat of the hot blast stove is introduced to match the heat required for CH4 decomposition, and after the feasibility is verified by thermodynamics, CH4 in the coal gas is pre-decomposed, a carbon removal device is matched at the rear end to remove carbon, the pre-decomposed coal gas is heated in the 600-700 DEG C heating section, and the process parameters are monitored in real time. When slight carbon precipitation occurs, trace stepwise water addition is used for carbon control. In view of the problems of CH4 high-temperature cracking and carbon precipitation in the blast furnace decarburization coal gas, and the consumption of high-grade heat energy of the blast furnace, the present application realizes energy cascade utilization, saves high-grade heat energy of the blast furnace, improves the calorific value of the coal gas and the reduction efficiency of the blast furnace, reduces the coke ratio, and inhibits carbon precipitation from the root.

The utility model discloses a grate prop device for hot -blast furnace, including bottom plate, the upper surface vertical fixed connection of bottom plate has hollow pole, the surface of hollow pole is sleeved with fixed cylinder column, the top of fixed cylinder column is fixedly connected with the top plate, both ends of top plate upper surface are all detachably provided with fixed plate, the upper surface fixed connection of fixed plate has the joist seat, the utility model relates to grate prop technical field. The grate prop device for hot -blast furnace, through the staff twists first bolt, through the inner end embedding of first bolt in the inside of corresponding height's bayonet, can fix the combination height between fixed cylinder column and hollow pole, and the convenient adaptation different work demand carries out the support use, and through the joist seat can be dismantled, and according to different specifications joist seat, the convenient adaptation different specifications joist carries out the support use.

The present application relates to the technical field of blast furnace ironmaking, and particularly relates to a cold air release valve with a safe release function, comprising a butterfly valve shell and a valve plate; an outer cylinder and a release cylinder are connected to the top of the butterfly valve shell, a release port is arranged on the release cylinder, a piston is arranged in the release cylinder, the piston opens or closes the release port through up-and-down reciprocating movement; the piston is in a cylindrical structure and a support plate is fixed to the inner wall of the piston, the valve plate is connected to a connecting rod mechanism, the top of the connecting rod mechanism penetrates through the support plate and is fixed through a nut, and an elastic element is arranged between the support plate and the nut; a pressure relief groove is arranged on the inner wall of the release cylinder. When the pressure of the cold air main pipe fluctuates and exceeds the safe pressure, the piston can still move upwards by a certain distance and expose the pressure relief groove under the action of the cold air pressure, the cold air is discharged through the pressure relief groove and the release port, the pressure of the cold air main pipe is lower than the safe pressure, and the problem that the equipment and the pipeline are damaged due to overpressure of the cold air main pipe caused by fluctuation of the cold air pressure can be effectively avoided.