1261 results about "Hearth" patented technology

The invention relates to the technical field of control and regulation systems, in particular to a hearth auxiliary regulation control system which comprises a data processing module, an analysis module, a control module, a regulation and control module, an optimization module and a safety early warning module. The data processing module collects temperature data of a hearth combustor area, a water cooling wall and a tail flue in real time through a distributed temperature sensor network, and a dynamic combustion field three-dimensional model is generated through Kalman filtering denoising, redundancy cross validation and a temperature compensation algorithm in combination with combustor flame position signals and an air door opening state. And the optimization module updates the strategy weight based on the combustion efficiency improvement rate, and reinforces learning to extend the adaptive boundary of the strategy library. And the safety early warning module calculates the matching coefficient of the pipe wall temperature and the allowable stress in real time, triggers a grading intervention strategy to reduce the overtemperature risk, forms full-process closed-loop control, and improves the thermal efficiency and the operation safety of the boiler.

The invention relates to the technical field of mechanical stress and thermal deformation monitoring, in particular to a combustion fine adjustment method based on full-hearth expansion monitoring, which is characterized in that expansion sensor arrays are arranged on each layer of a main burner area of a boiler hearth, and vibration monitoring units are arranged in a layered manner from a main burner to an SOFA air area synchronously; normal deformation, three-dimensional expansion displacement data and vibration spectrum data of the four furnace walls are collected; generating a standardized monitoring data set through wavelet noise reduction and temperature compensation processing, fusing boiler operation parameters, and inputting the boiler operation parameters into the reinforcement learning model to generate a combustor adjustment instruction; water-cooled wall expansion rate change data is collected in real time to optimize model weight and update a control strategy, and a closed-loop feedback mechanism is formed. According to the method, through multi-source sensing data fusion and dynamic modeling, sub-meter analysis of thermal load distribution and quick response of the combustion state are achieved, the boiler operation efficiency is improved, and the service life of equipment is prolonged.

The invention relates to a boiler flue gas temperature dynamic compensation method based on CFD-reinforcement learning, and belongs to the technical field of boiler operation control. The method comprises the steps that boiler operation parameters and flue gas temperature data are collected in real time, a multi-scale coupling three-dimensional CFD model is constructed, a macroscopic gas-solid two-phase flow-combustion reaction-radiation heat transfer coupling algorithm and a microcosmic pulverized coal particle combustion dynamics algorithm are fused, and hearth and flue temperature distribution is simulated and output; building a CFD-reinforcement learning fusion agent based on a CFD model, taking similar working condition agent parameters as initial values, combining historical and virtual data staged training, and reinforcing the weight of a key temperature measurement point through a focusing regulation and control strategy; an echo state network-predictive control collaborative algorithm is adopted, real-time data are input to obtain an initial adjustment amount, and after security constraint optimization, a compensation execution mechanism is controlled to act. The flue gas temperature is accurately and dynamically compensated, the adaptability to complex working conditions is improved, and equipment safety and operation efficiency are both considered.

The invention provides a dynamic diversion system of a homogenizing furnace, and relates to the field of industrial heat treatment equipment. The dynamic flow guide system of the homogenizing furnace comprises an outer wall, a furnace body, a hearth, a high-heat circulating fan and a flow guide cover body, and the furnace body is arranged in the outer wall. According to the invention, temperature data of multiple areas in the hearth are collected in real time through a temperature sensor, and in combination with closed-loop control of a controller on a first positive and negative motor, dynamic adjustment of the rotation angle of a flow guide plate and mechanism design of an eccentric rotating shaft and a movable groove, rotation motion of the first positive and negative motor is converted into multi-angle swing of the flow guide plate; the dynamic deflection of the flow guide plate can respond to the change of a temperature field in real time, the airflow path limitation of fixed flow guide is broken, the stagnant airflow in the right-angle area of the hearth participates in circulation again, and the linkage control logic of the controller, the temperature sensor and the first positive and negative motor realizes the temperature-flow guide angle self-adaptive adjustment; therefore, the dynamic balance of the temperature field can be completed without manual intervention.

The invention relates to the technical field of solid waste incineration automatic control, and discloses a solid waste incineration equipment automatic control method and system.The method comprises the steps that real-time data of solid waste components in a hearth are collected, and an initial multi-dimensional parameter set is obtained through preprocessing; calculating a balance point of the heat value and the water content through fuzzy reasoning; when the balance point exceeds a threshold value, parameter interaction influence is predicted, and a multi-dimensional control vector is generated; performing data fusion and historical data matching in combination with real-time incineration process indexes to obtain an enhanced load distribution adjustment factor; carrying out weight comparison based on the adjustment factor and the balance point, judging a load balance influence index, and carrying out matching correction if the index exceeds a compatible threshold value; updating a load distribution scheme according to a correction result, and generating a final operation strategy; and a control instruction is sent through a feedback cycle mechanism and is continuously optimized, so that closed-loop control is realized. The device can adaptively treat dynamic changes of solid waste components, and the incineration efficiency and stability are improved.

The graphitized product secondary roasting charging and discharging process comprises the following steps that S1, a high-purity graphite support or a multi-layer support structure is arranged in a hearth of a graphite furnace, and a graphite product is hoisted to the graphite support or the multi-layer support through a special clamp for charging; s2, sectional heating is adopted, the heating process is divided into a low-temperature section, a medium-temperature section and a high-temperature section, and the heating rate of each stage is controlled; s3, after roasting is completed, natural cooling is conducted, and after the temperature is reduced to the preset temperature, products are discharged out of the furnace; s4, the graphite product is clamped through a special clamp to be lifted out of the furnace, and in the step S1, the graphite product is vertically arranged on the graphite support and is arranged on the multi-layer support structure in a layered mode; when the secondary roasting charging and discharging process for the graphitized product is used, the stability and roasting uniformity of the product in a hearth can be guaranteed, segmented heating roasting is carried out in the furnace, graphite product cracking or performance reduction caused by temperature fluctuation can be avoided, the product quality is guaranteed, and the secondary roasting charging and discharging process for the graphitized product is suitable for application and popularization.

The invention discloses a system for controlling a fluid space field in a hearth based on a large model, and relates to the field of fluid space field control. The distributed sensor network, the data acquisition device, the distributed storage device and the edge computing device are arranged, the small prediction model and the large correction model are deployed in the edge computing device, the small prediction model is used for prediction, and the large correction model is used for correcting the prediction result, so that the prediction precision and stability are improved, and the prediction efficiency is improved. Based on the fluid space field data measured by the limited sensors in the hearth, prediction of the fluid space field in the hearth is completed, the fluid space field in the hearth is controlled based on the prediction result, and the control precision and stability of the fluid space field in the hearth are guaranteed.

The invention relates to a soot blowing optimization method for an intelligent circulating fluidized bed boiler, belongs to the technical field of boiler equipment and intelligent control, and is suitable for efficient operation and maintenance of circulating fluidized bed (CFB) boilers in the industries of electric power, chemical engineering, metallurgy and the like. The method aims at solving the technical problems that real-time sensing of the soot deposition state is insufficient, and soot blowing strategy hysteresis is high. The method comprises the steps of multi-dimensional data real-time acquisition and fusion, dust deposition state intelligent prediction and decision making, closed-loop feedback optimization and adaptive adjustment, and system integration and intelligent operation and maintenance. A high-precision sensor network (including hearth temperature, flue gas parameters, heating surface temperature gradient and the like) is deployed in a key area of a boiler, an infrared thermal imaging or image recognition technology is combined to monitor an ash deposition state, and an ash deposition prediction model is constructed through a machine learning algorithm (such as LSTM, random forest and CNN). Based on real-time data and model analysis, the soot blowing frequency, strength and medium parameters are dynamically adjusted through fuzzy control or a self-adaptive PID algorithm, and accurate soot blowing is achieved.

The utility model discloses a circulating fluidized bed boiler system capable of realizing deep peak regulation by regulating circulating ash. The circulating fluidized bed boiler system comprises a hearth, a separator, a return feeder, an ash cooler and a tail flue, one side of the top of the hearth is provided with an outlet, the outlet is connected with a separator, the upper part of the separator is connected with a tail flue, the bottom of the separator is connected with a return feeder, the return feeder is provided with a return feeder ash discharge port, and the return feeder ash discharge port is respectively communicated with the lower part of the hearth and an ash cooler; an outlet in one side of the ash cooler is connected with the slag warehouse. According to the system, the differential pressure transmitter is used for displaying the size of the differential pressure of the hearth to feed back the circulating ash amount, and the opening degree of the ash cooler is regulated and controlled to control the circulating ash amount entering the boiler, so that the influence of inertia of materials in a circulating loop on load change is reduced, the lowest stable combustion load of the boiler is reduced, and the peak regulation capacity of the boiler is greatly improved.

The embodiment of the invention discloses a fly ash coal oxygen-enriched melting intelligent control method based on multi-mode coupling prediction, and belongs to the technical field of solid waste recycling and intelligent control crossing. The method comprises the steps that S101, multi-source data collected by a sensor is obtained; step S102, obtaining control parameters through an intelligent control algorithm according to the multi-source data; s103, according to the control parameters, controlling an oxygen-enriched spray gun, a slurry outlet and a material ratio; wherein the step S102 comprises the sub-steps of performing decoupling prediction on the temperature T, the hearth negative pressure P, the flue gas oxygen concentration CO and the molten slurry yield Qp by adopting a multivariable decoupling prediction model; carrying out fuzzy control on the hearth negative pressure P by adopting a fuzzy self-adaptive PID (Proportion Integration Differentiation) controller; and a multi-objective optimization algorithm is adopted to calculate and obtain control parameters. The control method is small in melting temperature fluctuation, high in hearth negative pressure stability, high in quartz sand utilization rate, low in energy consumption per ton of molten slurry and high in heat preservation cotton qualification rate.

The utility model provides a crystallization roller way kiln for improving crystallization warping of microcrystalline glass. The crystallization roller way kiln comprises a furnace body with a hearth, an inlet is formed in one side of the furnace body, and an outlet is formed in the other side of the furnace body; a conveying device for conveying from the inlet to the outlet is arranged in the hearth; a temperature control system and a temperature control device matched with the temperature control system are arranged in the hearth; from the inlet to the outlet, the temperature control system comprises a heating unit and a cooling unit which are connected in sequence; the temperature control device comprises a top temperature control device and a bottom temperature control device which operate independently; and the conveying device is arranged between the top temperature control device and the bottom temperature control device. According to the crystallization process of the microcrystalline glass, the crystallization roller kiln disclosed by the utility model not only solves the problem that the microcrystalline glass is warped in the crystallization process, but also can correct and repair the warped microcrystalline glass by independently regulating and controlling the temperatures of the tops and the bottoms of the heating unit and the cooling unit.

The invention relates to the technical field of boiler temperature measurement, and discloses a boiler furnace temperature field measurement system based on multi-sensor fusion. According to a temperature acquisition module of the system, a plurality of groups of infrared temperature measurement sensors and thermocouple sensors are arranged in preset space grids of a boiler hearth, and real-time temperature data of each space grid are synchronously acquired; the data fusion module performs time alignment and space registration on the acquired data to generate a space-time synchronous original temperature data set; the noise suppression module performs multi-scale decomposition on an original data set based on wavelet transform, extracts a high-frequency noise component and performs adaptive filtering, and outputs a temperature data sequence after noise reduction; the temperature field reconstruction module reconstructs a hearth three-dimensional temperature field distribution model through a radial basis function interpolation algorithm according to the denoised data sequence; and the dynamic compensation module calculates the heat conduction lag compensation amount of the temperature field distribution model according to the flowing speed of the flue gas in the hearth and the working condition parameters of the combustor, and generates a compensated dynamic temperature field model.

The invention provides a fuzzy width hearth temperature model predictive control method, which relates to the technical field of hearth temperature model predictive control, and comprises the following steps: constructing a hearth temperature predictive model; obtaining a correction output variable according to the hearth temperature prediction model; according to a gradient particle swarm optimization algorithm and the correction output variable, solving an objective function of MPC corresponding to the hearth temperature prediction model to determine an optimal manipulated variable set; determining an optimal control law of the MPC according to the optimal manipulated variable set; according to the optimal control law, a control variable to be input is input into the hearth temperature prediction model, an initial controlled variable is obtained, the control variable is the secondary air volume, and the controlled variable is the hearth temperature; and correcting and compensating the initial controlled variable according to the prediction error at the current moment to obtain a final controlled variable. According to the method, the problems of high calculation complexity and low precision of the existing MPC control facing the FT in the MSWI process are solved.

The invention discloses a coal-fired boiler combustion instability monitoring method and system based on multi-parameter fusion, and the method comprises the steps: constructing a hearth flame imaging system which comprises an image detector, a lens, a stainless steel cavity and a cooling air channel; the flame image intensity is converted into radiation intensity through blackbody furnace calibration, and the flame temperature and emissivity are calculated based on the Planck law; extracting flame characteristic parameters including average radiation intensity, temperature, emissivity and standard deviation thereof; constructing a load-flame characteristic parameter model, and predicting parameter reference values under different loads through multiple linear regression; and calculating a combustion instability index CII, carrying out weighted fusion on the normalized deviation of the real-time measured value and the predicted value, and judging that CII is equal to 1 when the flame area is 0 or the average temperature is lower than 900 DEG C. The flame radiation image and the unit operation parameters are fused, and the limitation of traditional single-parameter monitoring is solved; combustion instability dynamic quantitative evaluation is achieved through the CII index, and the method is suitable for early warning of the deep peak regulation working condition.

The invention discloses a method and system for optimizing temperature uniformity of a hearth of a temperature isostatic pressing machine, and the method comprises the steps: arranging a plurality of layers of temperature measurement planes and a temperature monitoring network in the hearth, collecting all-region temperature data in real time, calculating three-dimensional temperature field distribution and uniformity indexes, generating a heater power regulation and control instruction in combination with the indexes, and controlling the temperature uniformity of the hearth of the temperature isostatic pressing machine. And dynamically adjusting the output power of the partitioned independent controllable heater array. According to the method, the whole area of a hearth is covered through multi-layer temperature measurement, temperature uniformity is evaluated through quantitative indexes, prospective power compensation is achieved with the help of a predictive control algorithm, control parameters are optimized through a thermodynamic simulation model, the problems that a traditional temperature isostatic pressing machine is incomplete in temperature monitoring and poor in heating regulation and control pertinence are solved, and the temperature isostatic pressing efficiency is improved. And the temperature uniformity of the hearth is greatly improved, the heating consistency of workpieces is guaranteed, and the device is suitable for a warm isostatic pressing machining scene of high-precision material forming.

The invention provides an SNCR (selective non-catalytic reduction) intelligent denitration system based on a sound sensing technology, and relates to the technical field of flue gas denitration. The hearth temperature calculation module sequentially sounds and receives the multiple sound wave signal flows, multiple hearth path temperatures are obtained through calculation and uploaded to the central processing unit through the temperature field reconstruction module, and a hearth combustion temperature field graph is generated through calculation; the denitration strategy control module is used for matching and analyzing a denitration strategy according to the hearth combustion temperature field graph and determining target denitration control strategy parameters; and the feedback optimization module adopts the parameters to execute denitration control operation, and regulates and updates target denitration control strategy parameters according to the denitration effect. The technical problem that SNCR denitration control is difficult to accurately match with the optimal reaction zone due to low temperature measurement means precision and insufficient spatial resolution in the prior art is solved, the SNCR denitration efficiency is improved, and ammonia escape is reduced.

The invention discloses an analysis method and system for preventing overtemperature of a coal-fired boiler tube, and the method comprises the steps: collecting the operation parameter data of steam temperature, hearth temperature, pressure, fuel flow and feed water flow in a boiler in real time, and collecting the external environment data of environment temperature and humidity; preprocessing the operation parameter data and the external environment data; based on the historical operation data, the preprocessed operation parameter data and the external environment data, a machine learning algorithm is used for constructing a boiler temperature prediction model, and model training is carried out; and inputting the boiler pipe wall temperature value which is acquired and preprocessed in real time into the trained boiler temperature prediction model to obtain a boiler temperature value predicted in real time, and performing overtemperature risk analysis in combination with a preset boiler safety temperature threshold. The system comprises a data acquisition and collection module, a data preprocessing module, a prediction model building and training module and an overtemperature risk analysis module. According to the method, the boiler overtemperature condition is accurately predicted and effectively prevented.

The invention belongs to the technical field of metal part casting, and particularly relates to a mining flat connecting chain ring and a heat treatment method thereof.The machined flat connecting chain rings to be subjected to heat treatment are loaded into a special material tray for heat treatment, and it is guaranteed that certain gaps exist between the connecting chain rings; after the heating furnace is heated to 400 + / -30 DEG C, a special charging tray for heat treatment and provided with the flat connecting chain ring is placed in the furnace, protective atmosphere is added into the furnace, and it is guaranteed that the air pressure in a hearth is 0.2-0.5 MPa; the temperature of the heating furnace is increased to 600 + / -30 DEG C again, heat preservation is conducted for 120 min, the temperature of the heating furnace is increased to 880 + / -30 DEG C again after heat preservation is completed, heat preservation is conducted for 120 min, and after heat preservation is completed, the special material disc for heat treatment containing the flat connecting chain ring is taken out and put into a quenching tank added with quenching liquid to be quenched for 8-10 min; and after quenching is finished, tempering and shot blasting treatment are sequentially conducted on the quenched flat connecting chain ring, a finished product of the flat connecting chain ring is obtained, and the breaking performance and the fatigue performance of the flat connecting chain ring are improved.

The utility model discloses a multi-hearth circulating fluidization and activation integrated furnace device for preparing activated carbon by a physical method, and relates to the field of activated carbon preparation of an activation furnace and a waste activated carbon thermal regeneration device. The device comprises a sealed spiral conveyor, a feeding pipe, a baffling type air cap, a pneumatic conveying medium inlet, a distributing device, a discharging pipe, a discharging pipe, a material cooling machine, a top gas mixer, a cyclone separator, a material returning device, a slag discharging pipe, a gas case, a bottom gas air cap and a slag cooling machine. Through the cyclone separator, carbonaceous semi-coke particles with the particle size larger than 100 micrometers are captured, activating agent gas flow is recycled from the lower hearth to the material layer of the upper hearth through the baffling type air cap, and granular carbonaceous materials flow into the material layer of the lower hearth through the discharging pipe after being fluidized and activated from the upper hearth and are continuously fluidized and activated for product collection; the activating agent is saved, and meanwhile, the activated carbon yield of a carbonaceous raw material is increased, so that the integrated furnace device is more environment-friendly and economical.

The utility model discloses a roller kiln which comprises a kiln body, a roller bar used for conveying materials is arranged in the kiln body, a plurality of cooling air pipes communicated with an inner cavity of the kiln body are arranged at the top of the kiln body, one end of each cooling air pipe is communicated with a fan, a gas pipe is arranged on the side face of the kiln body, and the kiln body comprises an arch-top kiln body and a flat-top kiln body. Exhaust pipes are arranged on the two sides of an inner cavity of the flat-top kiln body in a penetrating mode, the exhaust pipes are connected with the flat-top kiln body through screws, the exhaust pipes on the two sides are located above and below the roller bars respectively, and the exhaust pipes are connected with the cooling air pipes through pipelines; the utility model has the advantages that tar is convenient to remove and the sintering effect is good.

The invention discloses an electric flame stove capable of eliminating ozone. The electric flame stove comprises a stove body, a magnetic energy box mounted at the upper end of the stove body and a burner mounted in the stove body, and a magnetron is arranged at the microwave emission port in the magnetic energy box. The high-frequency electromagnetic wave is adopted to excite the initial plasma, so that the temperature and efficiency of the electric flame are improved, and the high-temperature cooking requirements such as stir-frying in a kitchen are met; the reaction between active particles (oxygen ions O or oxygen atoms O) in plasma and ozone is accelerated by adopting high-frequency electromagnetic waves, and finally ozone molecules are decomposed and reduced, so that ozone overflow is inhibited; in a non-pot state, the density of the plasma in the double hearths is small, the microwave switch is switched off, the magnetron stops working, and microwave leakage is completely eradicated from the source; the cooling tank is annularly distributed on the side wall of the second hearth to form a continuous gas barrier surrounding the second hearth, so that the magnetron and the side wall of the second hearth are prevented from being influenced by ultrahigh temperature.

The invention discloses a heat pipe type premixed water cooling inter-pipe combustion steam generator boiler and an operation method, the boiler is vertically arranged and comprises a steam generator, the steam generator is connected with an upper header through a downcomer I and an ascending gas guide pipe, and the steam generator is connected with a lower header through a downcomer II; the upper header and the lower header are communicated through the left and right membrane water-cooled walls, the front wall micropore combustion membrane wall, the heat exchange light tube bundle and the finned tube bundle; an area enclosed by the left and right membrane water-cooled walls, the front wall micropore combustion membrane wall, the heat exchange light tube bundle and the finned tube bundle is a hearth; a condensed steam heat exchange pipe is arranged in the steam generator and is connected with a water inlet and a water outlet of the steam generator; the energy-saving condenser and the air pre-heater are arranged behind the hearth, the overall structure is compact, and water vapor can be fully condensed; boiler feed water is indirectly heated through the steam generator, water circulation in the steam generator is promoted, the scaling risk in a boiler body pipe is eliminated, and the operation stability of the steam generator is improved.

The energy-saving heating furnace comprises a furnace body and a heating gun arranged in front of the furnace body, the furnace body comprises an outer box and an inner container arranged in the outer box, a discharging hole and a feeding hole are formed in the front side and the rear side of the outer box respectively, and the position of an opening in the front end of the inner container is matched with the position of the discharging hole; a fire spraying opening of the heating gun is arranged backwards and is aligned to an opening in the front end of the inner container through the discharging hole, and the inner container comprises a heat insulation body and a hearth arranged in the heat insulation body; the heat energy recovery system is arranged between the air inlet of the heating gun and the inner container; the waste heat circulating mechanism is arranged between the outer box and the inner container; according to the invention, the heating time of the heating gun is effectively reduced, and the feeding speed of the metal section material is accelerated, so that the fuel consumption is greatly reduced to achieve the purposes of energy conservation and environmental protection, meanwhile, the production efficiency is effectively ensured, the potential safety hazard is eliminated, and an operator cannot be scalded even if the operator accidentally touches the smoke exhaust pipe or the outer wall of the furnace body.

The invention provides a multi-interlayer energy-saving hearth used on a gas stove. In the prior art, a single-layer gas control basin or a welded double-layer gas control basin is used for improving the detection thermal efficiency, but the thermal insulation performance is poor, more heat is lost, and the thermal efficiency is reduced. The multi-interlayer energy-saving hearth comprises an outer hearth and an inner hearth, the outer hearth is in a big-end-up round sleeve shape, the outer hearth is arranged outside a burner of the gas stove in a sleeving mode, the bottom face of the outer hearth is placed on the stove face of the gas stove to be in a closed state, an outer hearth boss is machined on the upper portion of the interior of the outer hearth, and a plurality of outer hearth air inlet holes are evenly distributed in the lower face of the outer hearth along the circumference; the appearance of the inner chamber is in a basin shape with an inner chamber hole in the center, the inner chamber is arranged in the outer chamber, the periphery of the inner chamber is placed on the outer chamber boss, the inner chamber hole is close to the burner and is flanged upwards, and a gap between the inner chamber hole and the burner is used as an outer air supplement port for secondary air; and the pot rack consists of a pot rack ring and a plurality of pot rack legs and is arranged on the upper edge of the outer chamber. Through multi-aspect improvement, the thermal insulation performance and heat recovery are improved, the thermal efficiency is higher than that of various existing gas stoves, and the gas stove is easy to detach and wash.

The invention provides a method for detecting the furnace temperature uniformity of a roller hearth type heat treatment furnace. The method is applied to a roller hearth type heat treatment furnace system comprising a furnace body, a heating device, a temperature sensor array and a medical service big data management system. The method comprises the steps that a temperature sensor array containing 14 measuring points is arranged at a specific position of a furnace body, and a furnace temperature data recording black box is fixed to the lower right corner of the furnace body; controlling the heating device to heat to a target process temperature of 920 DEG C and keeping the temperature constant for 30 minutes; the temperature data of the whole furnace area is collected every five minutes; and calculating a reference temperature and an absolute deviation value set of each measurement point through a medical service big data system, and evaluating the temperature field uniformity of the furnace body. And when the deviation exceeds a threshold value, the system generates a correction parameter group containing a heating zone power compensation coefficient and a refractory material density gradient value, and executes power redistribution or thermal insulation layer enhancement operation. High-precision detection and dynamic optimization of the temperature field uniformity of the roller hearth type heat treatment furnace can be realized, and the stability of a heat treatment process and the consistency of product quality are improved.

The embodiment of the invention discloses an efficient SNCR control method, and relates to the technical field of SNCR denitration. The efficient SNCR control method is used for the SNCR denitration system of the boiler, a hearth of the boiler is divided into a plurality of subareas in the horizontal direction, multiple layers of spray guns are arranged in each subarea in the height direction of the hearth, and the method comprises the steps that the boiler load during operation, the boiler outlet smoke water content and the smoke temperature of each subarea of the layer where a temperature measuring device is located are obtained; according to the boiler load, the boiler outlet flue gas moisture content and the flue gas temperature of each subarea of the layer where the temperature measuring device is located, the flue gas temperature of each spray gun is calculated in real time through a pre-established three-dimensional temperature field calculation model; according to the flue gas temperature of each spray gun, the spray gun in the optimal denitration reaction temperature interval is selected in each subarea; and the spray gun selected in each zone is controlled to be put into operation. According to the invention, the problem of low NOx removal efficiency or high NH3 escape in different hearth areas can be solved.

The invention relates to the technical field of Isa furnace metal smelting processes, in particular to a numerical simulation method and system for reaction of pulverized coal at the upper part of a hearth of an Isa furnace and monitoring of flue gas components at an outlet, which are based on reasonable basic assumption and in combination with field parameters, construct a simulation equation and perform parameter coupling on a control equation in the simulation process. The physical quantity field distribution in the hearth in the metal smelting process of the Isa furnace can be subjected to accurate numerical simulation, the obtained data is matched with the actual production data, the corresponding production rule can be obtained, and the method has important guiding significance for controlling the coal consumption of the Isa furnace and the flue gas components at the outlet; besides, the numerical simulation method for monitoring the pulverized coal reaction at the upper part of the hearth of the Isa furnace and the flue gas components at the outlet and the corresponding data can be used as a basic support for intelligent feeding or other related parameter management and control in the metal smelting process, so that more accurate management and control in the smelting production link of the Isa furnace can be realized; and the effects of reducing cost and increasing efficiency are achieved.

The invention discloses reflow soldering equipment and process for SMT patch production. The reflow soldering equipment comprises a furnace body base, a conveying unit, a hearth and a sealing top cover. A conveying unit is horizontally laid on the furnace body base, the hearth is installed on the upper end face of the furnace body base in a sealed mode, and the interior of the hearth is evenly divided into three independent working areas which are the preheating area, the backflow area and the cooling area in sequence from left to right. A visual inspection chamber is installed at the position, located at the feeding end of the hearth, of the upper portion of the furnace body base. A heating device is arranged in each working area of the hearth; in the heating device of the backflow area, each microplate is slidably provided with a vertically arranged hot spray pipe, and the hot spray pipes can perform hot air pulse direct blowing on large-size surface-mounted elements on a PCB, directly heat pin welding spots, realize micro-swing attachment of the elements in cooperation with surface tension of solder paste, and eliminate mechanical stress when the chip mounter is placed.

The application discloses a movable furnace hearth with an accelerated heating function and belongs to the technical field of a blast furnace hearth. The movable furnace hearth comprises a furnace hearth body, a moving base, a movable wheel with adjustable start and stop, a ventilation seat, a height-adjustable heating and cleaning integrated assembly, a multi-section hollow pipeline, a winding mechanism and a hammering, piercing and fire spraying integrated assembly. The moving base is fixedly arranged at the bottom of the furnace hearth body. The movable wheel with adjustable start and stop is fixedly installed on the outer side of the moving base in a ring array distribution mode. The ventilation seat is welded on the outer wall of one side of the bottom of the furnace hearth body. The multi-section hollow pipeline is fixedly installed at the center position of the bottom of the inner cavity of the furnace hearth body. The height-adjustable heating and cleaning integrated assembly is fixedly installed on the top of the multi-section hollow pipeline. The winding mechanism is arranged on the top of the height-adjustable heating and cleaning integrated assembly. The application has the advantages of convenience in movement, uniform heating effect, fast heating speed, convenience in internal impurity crushing and cleaning and suitability for promotion and use.

The invention relates to the field of iron and steel metallurgy blast furnace ironmaking, in particular to a method for activating a hearth through blast furnace operation, which comprises the following steps of: establishing a reasonable lower air supply system and an upper charging system, balancing edge and middle airflow distribution, stabilizing a heat system and a slagging system, implementing low-silicon smelting, improving stokehole operation and the like. The temperature of the furnace bottom and the temperature of each layer of the side wall of the hearth are stable, uniform and controllable. A blast furnace operator operates the blast furnace by implementing the technology, the effect of activating the hearth can be achieved, long-term stable and smooth operation of the furnace condition is promoted, and safe, economical, efficient and long-life production of the blast furnace with the stable upper part and the active hearth is achieved.