36 results about "Supercritical steam generator" patented technology

The invention discloses an online monitoring method for the expansion state of a supercritical boiler based on the Internet of Things. The online monitoring method comprises the steps that a boiler body is divided into a plurality of levels along the height; setting a plurality of detection points on the main hierarchy; monitoring multi-direction expansion displacement data of each detection point through a sensor group; receiving the data through a data transmission unit, and transmitting the data to a processing unit; the processing unit processes and analyzes the data transmitted by each data transmission unit after receiving the data, and transmits a result to the evaluation unit; the evaluation unit evaluates the boiler wall expansion state of each layer according to the analysis result; hierarchical division and detection point layout are optimized through boiler structure stress characteristics and thermal load distribution rules, three-dimensional expansion data are captured through a multi-direction sensor set, real-time data transmission is achieved through the Internet of Things, an evaluation model is built by fusing boiler operation multiple parameters, and accurate, comprehensive and real-time monitoring of the boiler expansion state is achieved. And safe and stable operation of the supercritical boiler unit is ensured.

The invention relates to the field of boiler control, and discloses an ultra-supercritical boiler control method and system with a dynamic overtemperature early warning function. Comprising the following steps: generating a dimensionless dynamic state description set based on boiler design parameters and real-time sensor data; and according to the three-dimensional grid division of the heating surface, when the gradient exceeds a safety threshold, generating an early warning signal carrying a space coordinate, thereby realizing early-stage accurate positioning of the risk. Generating a proportional gain parameter based on the early warning position weight and the overtemperature probability value, and offsetting the execution delay through phase lead compensation; and updating sensor data after executing the instruction, and generating a closed-loop convergence mark when the detection state change rate is lower than a threshold value, thereby realizing control stability verification. According to the invention, the traditional static threshold alarm and manual intervention mode is broken through, the conversion from passive alarm to active suppression is realized, and the pipe explosion risk under the working condition of deep peak regulation is obviously reduced.

The application discloses a device for 600MW supercritical boiler dry and wet state automatic switching, and relates to the technical field of control devices; the device comprises a dry and wet state switching module; the dry and wet state switching module is used for obtaining the air pressure value in a steam-water separator of a water storage tank, obtaining the liquid state in the water storage tank, obtaining the instruction information of dry state to liquid state when the air pressure value is in the range of 10MPa-11MPa and there is liquid in the water storage tank, and obtaining the instruction information of liquid state to dry state when the air pressure value exceeds 11MPa and there is no liquid in the water storage tank; and the device realizes the automatic switching of the dry state and the wet state of the boiler through the dry and wet state switching module and the like.

The invention provides a forging method for a water chamber end socket with a pipe nozzle of an ultra-large steam generator, and belongs to the technical field of metal material forming. In order to solve the problems that the forging profiling degree of the ultra-large steam generator water chamber end socket with the pipe nozzle is not high and operation is difficult, the forging method for the ultra-large steam generator water chamber end socket with the pipe nozzle comprises the steps that S1, a cylindrical blank is prepared; s2, primary shaping; s3, expanding a pipe nozzle; s4, secondary shaping; s5, deep forming; and S6, radial forming. Near-net forming forging of the water chamber end socket with the nozzle of the ultra-large steam generator is achieved through multiple procedures, multiple directions and multiple dies, particularly, the profiling degree of the nozzle position is high, the weight of a steel ingot is small, and the machining difficulty is small.

The application provides a high-temperature gas cooled reactor type supercritical ultra-supercritical boiler steam generator, which comprises a shell and a heat exchange device arranged in the shell, a maintenance space for people to enter is arranged between the shell and the heat exchange device, the shell is provided with a hot helium gas inlet and a cold helium gas outlet connected with a reactor, and the application further comprises a helium gas isolation valve for opening and closing the hot helium gas inlet and the cold helium gas outlet. In this way, since the helium gas isolation valve can close the hot helium gas inlet and the cold helium gas outlet, the helium gas passage with the reactor can be cut off in an accident, and the supply of high-temperature helium gas is stopped, so that the safety level of the steam generator is reduced, the steam generator is no longer limited by the nuclear power safety I level design and manufacturing specification, and the thermal power boiler design and manufacturing specification can be used. Moreover, the helium gas cannot be activated, the radiation dose inside the boiler steam generator is very low, and personnel can enter the maintenance space to check and maintain the boiler steam generator.

The invention provides a supercritical CO2 boiler hearth thermodynamic calculation method, which comprises the following steps: coupling hearth radiation heat exchange and convective heat exchange calculation, and correcting a hearth outlet flue gas temperature assumed value by adopting an iterative algorithm; the problem that the calculation deviation of the supercritical CO2 boiler is large due to the fact that convective heat transfer is ignored in a traditional steam boiler thermodynamic calculation method is effectively solved. According to the method, the heat exchange area is accurately calculated, a corrected convective heat exchange correlation formula is adopted, and the physical property change of a working medium is considered, so that the matching degree of the hearth thermodynamic calculation precision and the actual working condition is remarkably improved, and reliable data support is provided for efficient design, safe operation and optimal regulation and control of the supercritical CO2 boiler.

The embodiment of the invention provides a coal-fired supercritical CO2 boiler and a circulating power generation system. The boiler comprises a primary gas hearth and a secondary gas hearth which are independently arranged; a primary gas hearth combustor is arranged in a combustion area at the bottom of the primary gas hearth, and a primary gas high-temperature heating surface is arranged at the top of the primary gas hearth; a secondary gas hearth combustor is arranged in a combustion area at the bottom of the secondary gas hearth, and a secondary gas high-temperature heating surface is arranged at the top of the secondary gas hearth; a hearth outlet of the primary gas hearth is communicated with a hearth outlet of the secondary gas hearth through a horizontal flue, and an outlet of the horizontal flue is communicated with an inlet of a tail flue of the boiler; a low-temperature heating surface assembly, an adjusting baffle assembly, a flow dividing economizer, an SCR denitration device and an air preheater are sequentially arranged on the boiler tail flue in the direction from an inlet to an outlet of the boiler tail flue. According to the coal-fired supercritical CO2 boiler and the circulating power generation system, the boiler is high in flexibility, the climbing rate of 6% Pe / min or above can be achieved, and the temperature of primary gas and the temperature of secondary gas can be accurately controlled.

The invention discloses an online oxide skin concentration monitoring system, method, equipment and medium for a supercritical boiler, and the system comprises a data collection module which is used for obtaining various data of boiler smoke discharge and transmitting the data to a data processing module; the data processing module is used for receiving and preprocessing the data acquired by the data acquisition module; the intelligent prediction module is used for constructing a multi-parameter coupling model through an intelligent algorithm, inputting the preprocessed data into the multi-parameter coupling model and predicting the oxide skin concentration; and the early warning module is used for visually displaying the prediction result and automatically triggering an alarm mechanism when the oxide skin concentration exceeds a preset threshold value. Through multi-source sensor data fusion and intelligent algorithm modeling, real-time online monitoring of the oxide skin concentration is realized, the hysteresis problem of traditional offline detection is solved, the false alarm rate of the system is reduced, the early warning reliability is greatly improved, and an intelligent solution is provided for safe and economical operation of the supercritical boiler.

The invention discloses a supercritical boiler pipeline heat transfer strengthening device and method.The supercritical boiler pipeline heat transfer strengthening device comprises a conical part and a slip rope which are arranged in a boiler pipeline, the conical part is arranged in the flowing direction of supercritical liquid in the boiler pipeline, and the small end of the conical part faces the supercritical liquid; the slip rope is arranged in the axial direction of the boiler pipeline and penetrates through the conical part, the conical part is connected with the slip rope in a sliding mode, and the conical part can stop at the protruding position of the supercritical gas film on the inner wall of the boiler pipeline. The heat transfer strengthening device is adopted for heat transfer strengthening of the supercritical boiler pipeline. The device is simple in structure and low in cost, can reduce the thickness of a similar gas film on the wall surface of the pipeline at a fixed point and strengthen local heat transfer so as to ensure the operation safety of a heat exchange pipe of the boiler, adapts to the wide-parameter-range working condition operation of the supercritical boiler, does not cause mechanical damage to the pipeline of the boiler in the use process, and ensures the operation safety of the supercritical boiler.

The application discloses a supercritical boiler deep peak shaving dry-wet state conversion dynamic characteristic prediction control method and related equipment, and belongs to the technical field of thermal energy engineering. The method is applied to a coal-fired power generation unit control system, and comprises the following steps: obtaining dry state stable operation parameters of a boiler heating surface loop before dry-wet state conversion and changes of boundary conditions such as heating surface heat load, working medium inlet enthalpy, inlet mass flow and outlet pressure of the heating surface loop with time during the conversion process; taking the dry state parameters as initial conditions and the dynamic boundary conditions as inputs, iteratively calculating a transient hydrodynamic calculation model based on a one-dimensional homogeneous flow assumption and coupled with transient control equations of a fluid domain and transient heat conduction equations of a metal pipe wall to obtain predicted values of key parameters; and generating a load reduction rate optimization suggestion and / or an enthalpy-water level control strategy switching time suggestion according to the predicted values. The method can accurately predict dynamic changes of parameters in the dry-wet state conversion process, and provides a forward-looking adjustment signal for an automatic control system.

The invention discloses an anisotropic physical field simulation modeling method and system for a complex tube bundle structure of a boiler water-cooled wall based on heterogeneous geometric equivalence, and the method comprises the steps: geometrically mapping a hollow circular tube structure with a complex curvature into a regular rectangular entity unit, and carrying out the modeling of an anisotropic physical field of the complex tube bundle structure of the boiler water-cooled wall based on the principles of energy conservation, rigidity conservation and thermal resistance conservation. And a set of complete virtual anisotropic material constitutive model is deduced and established. The model is based on path extension and section correction theories in the tangential direction (X direction), introduces logarithmic thermal resistance equivalence and circular ring curved beam rigidity theories in the radial direction (Y direction), and adopts a bearing area scaling criterion in the axial direction (Z direction); therefore, the equivalent simplified model is highly consistent with an original physical structure in macroscopic thermal resistance, structural rigidity, thermal deformation and three-dimensional shearing behaviors. By means of the method, engineering personnel can reduce the calculation freedom degree by a plurality of orders of magnitude on the premise that the accuracy of key physical characteristics is not sacrificed, and the efficiency of thermal fatigue life evaluation and structure optimization design of the water cooling wall of the supercritical boiler is remarkably improved.

This invention relates to the field of industrial boiler equipment manufacturing technology, and discloses a multi-node, high-efficiency, energy-saving, and automated welding process for supercritical boiler supports, including the following steps: pre-detection and database construction of welding material composition: using a miniature laser-induced breakdown spectroscopy sensor to detect the elemental content of welding materials used in supercritical boiler supports, establishing a basic database of welding material composition, and calculating the deviation values ​​of each element from the standard composition; workpiece pre-treatment and fixture installation; equipment system linkage debugging; pre-adaptation of pre-welding parameters; layered and segmented collaborative welding; time-division and frequency-division four-mode collaborative quality closed-loop control; post-weld treatment and system reset. Through time-division and frequency-division four-mode collaborative quality control, dynamic compensation for welding deformation, and interpass temperature control technology, this invention effectively reduces the incidence of defects such as incomplete fusion and cracks in welds, ensures that the pass rate of weld radiographic inspection meets standards, and improves the stability of welding quality.

The application provides a monitoring and emission control optimization adjustment method for sulfur trioxide, and belongs to the technical field of optimization adjustment, and comprises the following steps: different types of sensors are used to synchronously monitor sulfur trioxide in flue gas of a supercritical boiler in real time, data preprocessing and data fusion processing are performed on the synchronous monitoring results, a correction model established in combination with parameters of the supercritical boiler is used to correct the processed data, historical monitoring data, historical operation parameters of the supercritical boiler and a historical operation state of flue gas treatment equipment are deeply mined, a sulfur trioxide control model is established, coordinated control instructions of the flue gas treatment equipment and desulfurization adjustment parameters in a desulfurization system are determined according to output results, optimization control adjustment is performed, a model is established, and output effective control results of analysis of the current monitoring results are obtained, and optimization and regulation of the equipment are intelligently realized.

The invention discloses a manufacturing method of an S31035 austenitic stainless steel seamless steel tube for an ultra-supercritical boiler, which belongs to the technical field of material processing, and specifically comprises the following steps: (1) preparing austenitic stainless steel S31035 round steel, peeling, cutting off, grinding and inspecting a tube blank, punching a through hole, carrying out hot extrusion, and carrying out acid pickling, tube cutting, grinding, inspecting and cleaning on a pierced billet obtained by hot extrusion; (2) carrying out cold rolling of a deformation process on the pierced billet obtained in the step (1), and then carrying out heat treatment to obtain a finished product specification; and (3) performing visual inspection, size inspection, cleaning, mark spraying and finishing procedures on the finished pipe obtained in the step (2), and finally packaging and warehousing. According to the manufacturing method, the process optimization is strictly limited, and products which can ensure the consistency of the pipe performance, improve the material utilization rate and reduce the production cost and the rejection rate can be stably manufactured.

The application provides a steam generator flow stability determination method and system, which comprises the following steps: establishing a conservation equation describing the convection heat transfer process in the steam generator tube; establishing a nonlinear ordinary differential equation set describing the steam generator flow stability according to the conservation equation; establishing a linear ordinary differential equation set describing the steam generator flow stability according to the nonlinear ordinary differential equation set; and establishing a dimensionless criterion describing the steam generator flow stability according to the linear ordinary differential equation set. The dimensionless criterion for describing the flow stability has strong accuracy and universality, and can be applied to predicting the stability and stability boundary of a once-through steam generator or a supercritical steam generator.

The application provides a supercritical boiler flue gas treatment facility influence analysis method for sulfur trioxide emission, belongs to the technical field of influence analysis, and comprises the following steps: setting a sampling probe at different target positions of a supercritical boiler flue, setting a sampling frequency for multi-point synchronous sampling of flue gas according to a boiler operation condition and research demand, determining the sulfur trioxide concentration of each target position, monitoring the temperature, pressure and flow rate of flue gas at the target position during the sampling process as a supplementary result, determining the best operation parameter of the flue gas treatment facility in combination with the current operation parameter of the supercritical boiler, collecting the current operation parameter of the flue gas treatment facility, determining the influence coefficient of the flue gas treatment facility on sulfur trioxide emission, and determining a control set according to the influence coefficient and in combination with the operation attenuation factor of the flue gas treatment facility. The reasonable analysis of influence and the dynamic optimization of flue gas treatment facility operation are realized.

The invention discloses a W-flame ultra-supercritical boiler for burning anthracite and an operation control method, and belongs to the technical field of design and manufacturing of power station boilers. The boiler comprises a combustion system, an air distribution system, a fuel supply system and a steam-water system, the combustion system comprises a hearth and a plurality of combustors, the air distribution system comprises staged air, over fire air, a close-to-wall air nozzle and a close-to-wall air parallel side water cooling wall, the fuel supply system comprises a primary air pipeline and an exhaust pipeline for feeding exhaust in a split mode, and the steam-water system comprises a water cooling wall and a reheater. The water cooling wall is provided with a middle mixing header, the reheater comprises a low-temperature section and a high-temperature section, an accident spray desuperheater is arranged at an inlet and an outlet of the low-temperature reheater, and a cross mixing header is arranged at an outlet. The invention is mainly used for high-efficiency clean combustion power generation of high-sulfur and low-volatile anthracite, and is used for coal-fired power generation of 660MW grade power stations.

The invention discloses a method for predicting the wall temperature of a high-temperature reheater of a supercritical boiler, relates to the technical field of intelligent monitoring of an industrial thermodynamic system, and solves the inherent bottlenecks of a single neural network model in the aspect of simultaneously capturing time sequence dependence, spatial relevance and multivariable interaction effect. And the practical demand of the power plant on accurate temperature prediction is difficult to meet. The method comprises the following steps: acquiring operation data of a supercritical boiler within a period of time, and establishing a supercritical boiler database; training the artificial intelligence model based on a preset supercritical boiler database to obtain a CNN-BiLSTM model; the method comprises the following steps: preprocessing data in a supercritical boiler database to obtain a plurality of relatively stable subsequences; according to the method, the CNN-BiLSTM model is optimized, so that an optimal CNN-BiLSTM model is obtained; and predicting the plurality of relatively stable subsequences based on the optimal CNN-BiLSTM model to obtain a final high-temperature reheater wall temperature prediction result, and solving the technical problem.

This invention discloses an energy recovery system and method suitable for low-load wet operation of an ultra-supercritical boiler, comprising: a water storage tank, an atmospheric expansion tank, a heat accumulator, a thermal oil storage tank, a feedwater heater, a steam-water separator, a feedwater pump, a deaerator, and an ultra-supercritical boiler. The ultra-supercritical boiler and the water storage tank form a loop. The water storage tank is also connected to the atmospheric expansion tank and a condensate tank in sequence via pipelines. A branch pipeline between the water storage tank and the atmospheric expansion tank is connected to the heat accumulator. The heat accumulator, the thermal oil storage tank, and the feedwater heater form a loop on their heat source sides. The inlet of the feedwater heater on its feedwater side is connected to the deaerator via the feedwater pump, and the outlet of the feedwater heater on its feedwater side is connected to the ultra-supercritical boiler via a high-pressure regenerative heater group. This energy recovery system and method can effectively recover heat from saturated condensate, improve the operating efficiency of the ultra-supercritical boiler, and improve the denitrification efficiency of the denitrification equipment under low load.

The invention discloses a high-temperature corrosion-resistant metal-based ceramic composite boiler suspender, a preparation method thereof and a special additive manufacturing system, and belongs to the field of high-end equipment manufacturing. In order to solve the problems that an existing boiler suspender is sensitive to thermal shock, rapid in creep and insufficient in microcosmic thermal management, a GH4169 nickel-based alloy is used as a matrix, a high-temperature phase change microcapsule is used as a flexible phase, rare earth oxide is used as an interface agent, and a nacre-simulated standard brick mud microstructure is constructed through a multi-channel laser directional energy deposition technology. The special system comprises a multi-channel powder feeding module, a dynamic power adjusting module and a real-time monitoring module, and cooperates with alternate oscillation / spiral scanning and hot isostatic pressing-aging composite post-treatment to achieve macroscopic uniformity and microcosmic self-adaptive thermal management cooperation of the material. The thermal shock resistance, creep resistance and corrosion resistance of the suspender are remarkably improved, the service life is prolonged by 3-5 times, and the suspender is adaptive to high-temperature working conditions such as an ultra-supercritical boiler, meets the targets of high efficiency, long service life and double carbon and has a wide application prospect.

The invention discloses a welding robot for machining nodes of a heavy bearing steel structure of a supercritical boiler, and belongs to the technical field of welding robots. The welding robot comprises a supporting seat and hydraulic rods which are fixedly mounted on a welding seat, and the hydraulic rods are symmetrically arranged relative to the supporting seat; the output end of the hydraulic rod is fixedly provided with a bracket used for supporting the steel structural part, meanwhile, the supporting seat is rotationally provided with a movable seat, and the movable seat is fixedly provided with a welding mechanical arm; a position adjusting driving assembly is installed between the supporting base and the movable base, and a first cavity, a second cavity, a third cavity and a fourth cavity are formed in the inner side of the movable base. According to the welding robot for machining the nodes of the heavy bearing steel structure of the supercritical boiler, high-temperature flue gas generated by welding can be evenly collected and filtered, automatic heat preservation and welding sealing detection can be conducted on the welded position through the filtered high-temperature flue gas, and the working efficiency is effectively guaranteed.

The invention belongs to the technical field of supercritical CFB (circulating fluid bed) boilers, and particularly relates to a supercritical CFB boiler deep peak regulation working condition smoke temperature optimization control system which comprises a sensing monitoring module, an intelligent control module and a regulation execution module. The primary air bypass air duct is introduced from a primary cold air duct of the supercritical CFB boiler and is divided into two paths which are respectively connected into a primary hot air duct and a secondary hot air duct; according to the requirements of boiler load and smoke exhaust temperature, the air volume of primary cold air passing through the primary air bypass air duct can be effectively adjusted by adjusting the electric adjusting air door, so that effective control over the volume of the primary cold air flowing into the air preheater is achieved, heat loss in smoke is reduced, and the energy consumption is reduced. Therefore, the temperature reduction amplitude when the flue gas passes through the air preheater is reduced, and the problem of bag pasting caused by too low temperature when the flue gas passes through a bag-type dust collector is avoided.

The present application relates to a kind of supercritical carbon dioxide boiler working medium impurity measuring device and method thereof, belong to boiler working medium measurement technical field.Solve is the short development time of emerging supercritical CO2 boiler technology, its quality evaluation system is blank at home and abroad problem.Including sampling valve, flowmeter, first particle filter, temperature and pressure reducing device, pressure gauge, temperature sensor, second particle filter, analyzer and end pump, sampling valve, flowmeter, first particle filter, temperature and pressure reducing device, pressure gauge, temperature sensor, second particle filter, analyzer, end pump are sequentially connected.Can measure the impurity of supercritical carbon dioxide brayton cycle system of power cycle, solve its quality system is blank at home and abroad problem.

The invention discloses a high-reliability boiler last-stage superheater and a transformation process thereof, and belongs to the field of power station boiler equipment. Each heating surface tube panel is composed of a low-temperature section and a high-temperature section which are formed by sequentially connecting tube sections made of at least two different materials in the steam flowing direction; the invention further comprises a process for transforming an existing boiler by adopting the last-stage superheater. By means of the transformation process, the defects that due to the fact that materials of a traditional supercritical / ultra-supercritical boiler last-stage superheater are oxidized and aged at high temperature, oxide skin falls off to block a pipeline, and then potential safety hazards and economic losses of over-temperature pipe explosion are caused are overcome.

The application discloses a method and system for preventing ultra-supercritical boiler cracking based on furnace wall temperature, selects a boiler cracking risk position in advance, obtains a simulated temperature of the risk position by simulating a real-time temperature field distribution of the boiler through a preset model, acquires real-time measured temperatures of part of the risk positions and corrects the real-time temperature field distribution by using the real-time measured temperatures, and prewarns and controls the operation parameters of the boiler according to a temperature boundary threshold and the corrected simulated temperature. On the basis of an existing boiler temperature monitoring platform, the risk position wall temperature measuring points are added, the simulated boiler temperature distribution is corrected, the boiler operation temperature working condition can be more accurately monitored, the temperature boundary threshold is determined according to the thermal stress of the risk position, the critical state of the boiler cracking is prewarned, the operation parameters are controlled, the structure cracking leading to the ultra-supercritical boiler "four tube" leakage unplanned shutdown event is avoided, the non-shutdown event of the unit is effectively reduced, and the safety of the boiler operation is ensured.

The present application belongs to the technical field of coal-based solid waste high-value resource, and particularly relates to a method for preparing high-purity alpha-Al2O3 by supercritical boiler fly ash aluminum sulfate salting-out method. ‑ The present application finds that, in the process of salting-out reaction, the crystallization yield of aluminum chloride hexahydrate is proportional to the concentration of Cl in the reaction solution. The present application uses the above-mentioned property of aluminum chloride hexahydrate to remove impurities in aluminum chloride, and through repeated salting-out purification, high-purity alpha-Al2O3 is obtained. The present application combines sulfuric acid method and hydrochloric acid method to extract high-purity alpha-Al2O3 from fly ash, and has low cost, low energy consumption, simple operation, good safety and high product added value.

The invention relates to the field of steel rolling processes, in particular to the field of power station boilers. The invention discloses a preparation method for solving cold deformation surface cracking of an ultra-supercritical boiler tube S31089. The preparation method comprises the following steps: (1) extrusion of a pierced billet; (2) acid pickling of the pierced billet; (3) drawing of the pierced billet, (4) degreasing and acid pickling of a drawn tube, (5) heat treatment and straightening of the drawn tube, (6) chamfering before cold rolling, (7) primary cold rolling deformation, (8) heat treatment of a semi-finished product, (9) secondary cold rolling deformation and (10) heat treatment of the semi-finished product. (11) drawing a finished product; (12) pickling the finished product; (13) carrying out heat treatment and straightening on the finished product; and (14) inspecting the finished product. The problems that the S31089 steel grade is high in alloy content, narrow in deformation temperature, poor in thermoplasticity, high in cold rolling hardness, rapid in work hardening, large in number of precipitated phases in the machining process, low in ductility and prone to cracking of the inner surface and the outer surface due to cold rolling deformation are effectively solved through the method of extruding, drawing, chamfering, two-pass cold rolling and cold drawing of a finished product, and import is successfully replaced.

The invention discloses a preparation method for improving rolling and perforating yield of round steel for an ultra-supercritical boiler tube, which comprises the following steps: step a, taking 14-inch ingot type austenitic heat-resistant steel with the trademark of TP310HCbN to obtain a product A; step b, heating the product A to 900 + / -20 DEG C, keeping the temperature for 1.5-2.5 hours, then heating to 1250 + / -10 DEG C, and keeping the temperature for 8-10 hours to obtain a product B; c, the product B is subjected to multi-pass cogging and round rolling, in the rolling process, the temperature of the product B is kept between 1000 DEG C and 1260 DEG C, and a product C is obtained; and step d, peeling, sizing, heating and perforating the product C to obtain a finished product. The method has the advantages of low energy consumption, high production efficiency, high yield and high finished product quality.

The utility model provides an ultra-supercritical boiler full-working-condition composite dry and wet state conversion system, and belongs to the technical field of coal power unit flexibility reformation. The system comprises a boiler water recycling module used for recycling wet state water separated by a separator (34); the drainage expansion module is used for carrying out expansion vaporization after the temperature and pressure of the wet water are reduced, and secondary steam is obtained; and the heat exchange deoxidization module is used for carrying out heat exchange on saturated condensed water left after the wet water is expanded and vaporized and condensed water from the low-temperature heater to obtain supercooled water, and the supercooled water enters the heat exchange deoxidization module. According to the scheme, the working medium and heat of circulating water in the coal-fired boiler starting stage and the deep peak load regulation load can be recycled.

This invention discloses an axial force balancing mechanism for a supercritical boiler feedwater pump, relating to the field of feedwater pumps. It includes a pump body, a rotor, an inlet module, and a discharge module, as well as a pressurizing section, a balancing section, and a buffer section. The pressurizing section includes multiple impellers fixedly connected to the rotor and a pressurizing channel formed within the pump body. The balancing section includes a balancing chamber formed within the discharge module, containing a balancing disc fixedly connected to the rotor. The side of the balancing chamber away from the impellers is connected to the inlet module via a balancing pipe. The buffer section includes a buffer tank located outside the pump body, connected to a control component. The control component is connected to both the buffer pipe and the balancing pipe, with the buffer pipe connected to the side of the balancing chamber closest to the impellers. This mechanism rapidly establishes a balancing force during pump startup and quickly releases pressure during shutdown, solving the problem of rotor movement and wear caused by the lag in transient balancing force during pump startup and shutdown.