48 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 discloses an integrated hydraulic turbine furnace water circulating pump and a starting and stopping method. The furnace water circulating pump is sequentially divided into a hydraulic turbine unit, a first water chamber unit, a furnace water pump unit, a second water chamber unit and an axial force balancing unit according to functions. By designing a unique main and auxiliary channel water inlet structure, the problem of water sealing of a high-temperature and high-pressure furnace in a conventional shaft seal pump is solved, the working environment of each sealing element is greatly improved, the service life is prolonged, and meanwhile, the inner core can be integrally pulled out for replacement and is convenient to overhaul. On the basis, a step-by-step pre-heating and rapid shutdown method is further designed, the reliability under frequent start and shutdown is improved, the service life is prolonged, the start and shutdown process is further deeply fused into the deep peak regulation process of the supercritical boiler, the feed water flow of the supercritical boiler can be rapidly recovered after a hydraulic turbine boiler water circulating pump exits due to an accident, and the service life of the supercritical boiler is prolonged. And the fault of water cut-off and shutdown is avoided. Meanwhile, the recycling function of a steam feed pump set can be replaced, and the reliability of a water supply system is improved.

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 invention provides a sulfur trioxide monitoring and emission control optimization adjustment method, and belongs to the technical field of optimization adjustment, and the method comprises the steps: carrying out the real-time synchronous monitoring of sulfur trioxide in supercritical boiler flue gas through different types of sensors, carrying out the data preprocessing and data fusion processing of a synchronous monitoring result, and carrying out the real-time monitoring of the sulfur trioxide in the supercritical boiler flue gas; and correcting the processed data by combining a correction model established with the parameters of the supercritical boiler, carrying out deep mining on historical monitoring data, historical operation parameters of the supercritical boiler and historical operation states of the flue gas treatment equipment, establishing a sulfur trioxide control model, and carrying out real-time monitoring on the sulfur trioxide control model. And a cooperative control instruction of the flue gas treatment equipment and desulfurization adjustment parameters in a desulfurization system are determined according to an output result, optimization control adjustment is performed, a model is established, an effective control result is output through analysis of a current monitoring result, and optimization and regulation of the equipment are intelligently realized.

The invention discloses a welding and heat treatment method for GH4070T and GH984G small-caliber dissimilar material pipes for a 650 DEG C ultra-supercritical boiler, and relates to a welding and heat treatment method for GH4070T and GH984G small-caliber dissimilar material pipes for a 650 DEG C ultra-supercritical boiler. Before welding, the groove is machined into a V shape and cleaned, and spot welding fixing is conducted; an ERNiCrCoMo-1 welding wire is selected for manual argon tungsten-arc welding, various welding parameters are controlled, and preheating is carried out according to the room temperature, and the interlayer temperature, the welding seam thickness and the like are controlled. And aging strengthening heat treatment is carried out after welding. And finally, 100% RT inspection is carried out according to the NB / T 47013 standard. The method solves the problems of easy generation of defects in welding, narrow process window, difficult compatibility of heat treatment systems and the like in the prior art, and ensures the quality of welding joints.

The invention provides a method for analyzing the influence of a supercritical boiler flue gas treatment facility on sulfur trioxide emission, and belongs to the technical field of influence analys.The method comprises the steps that sampling probes are arranged at different target positions of a supercritical boiler flue, sampling frequencies are set according to boiler operation conditions and research requirements, and multi-point synchronous sampling is conducted on flue gas; determining the concentration of sulfur trioxide at each target position, and meanwhile, monitoring the temperature, pressure and flow velocity of the flue gas at the target position in the sampling process as supplementary results; determining the optimal operation parameters of the flue gas treatment facility by combining the current operation parameters of the supercritical boiler; collecting current operation parameters of the flue gas treatment facility, and determining an influence coefficient of the flue gas treatment facility on sulfur trioxide emission; and determining a control set according to the influence coefficient in combination with an operation attenuation factor of the flue gas treatment facility. The reasonable analysis on the influence and the dynamic optimization on the operation of the flue gas treatment facility are realized.

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 present invention relates to a supercritical or ultra-supercritical boiler rapid strengthening working medium side energy supply system in the field of energy technology, comprising: a circulating water circuit matched with the boiler, which is connected with an input pipeline and an output pipeline; a steam-water separator, which is connected to the output pipeline of the circulating water circuit; a water storage tank, which is connected to the steam-water separator; a high-temperature boiler water energy storage device with a storage chamber; an openable and closable energy storage pipeline, wherein the steam chamber of the steam-water separator and the liquid chamber of the water storage tank are connected to the input side of the high-temperature boiler water energy storage device through the energy storage pipeline; an openable and closable energy release pipeline, wherein the energy release side of the high-temperature boiler water energy storage device is connected to the input pipeline of the circulating water circuit through the energy release pipeline. The ultra-supercritical boiler rapid peak regulation and variable load response capability can be strengthened from the working medium side.

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 present invention discloses a supercritical boiler flexible peak shaving system and method. The cold inlets of the steam boiler water heaters are respectively connected to the outlet of the main pipe of the economizer outlet and the lower header of the water wall. The steam pulverized coal heater is arranged on the primary air pulverized coal pipeline. The inlet and outlet of the hot steam extraction pipeline are respectively connected to the hot reheat steam header and the hot inlet of the steam boiler water heater. The hot outlet of the steam boiler water heater is connected to the hot inlet of the steam pulverized coal heater, and the hot outlet of the steam pulverized coal heater is connected with a waste steam pipeline. The present invention overcomes the problem of a relatively high wet state conversion load during the ultra-low load operation of a supercritical boiler. Under the condition that the unit is in ultra-low load operation and the boiler needs to be converted to wet state operation, the boiler water from the economizer outlet to the lower header of the water wall is heated, the ignition environment of pulverized coal is improved, and the conversion to wet state is postponed during the load reduction process; the primary air pulverized coal airflow is heated by steam, the temperature of the pulverized coal airflow is increased, the ignition heat of the pulverized coal is reduced, and the combustion stability is improved.

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 utility model discloses a structure device for an evaporation heating surface of a supercritical direct-current waste heat boiler, which comprises a heating surface arranged in a flue of the waste heat boiler, the heating surface is communicated with an inlet header and an outlet header through pipelines, the heating surface is a screen group type heating surface and comprises a screen A heating surface and a screen B heating surface, the first screen heating surface and the second screen heating surface are respectively formed by assembling and assembling mutually communicated heating pipes side by side in parallel, the heating pipes of the first screen heating surface are respectively communicated with a first screen inlet header and a first screen outlet header through pipelines, and the heating pipes of the second screen heating surface are respectively communicated with a second screen inlet header and a second screen outlet header through pipelines. According to the utility model, the screen group type heating surface is arranged in the flue of the waste heat boiler, so that the flue gas and the working medium can flow through at one time, the control requirements of the critical section of the supercritical boiler on the mass flow rate and the heat absorption capacity of the working medium are met, and the working medium can be changed into superheated steam in the outlet header from water in the inlet header.

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 relates to the technical field of CFB (Circulating Fluidized Bed) boilers, in particular to a supercritical and ultra-supercritical CFB boiler capable of quickly changing load and a regulation and control method. The outer circulation loop comprises a cyclone separator and an integrated material storing and returning device, and the integrated material storing and returning device comprises a direct material returning mechanism and a material storing and returning mechanism; the direct material returning mechanism comprises a first descending channel, a first ascending channel and a material returning channel; the material storing and returning mechanism comprises a second descending channel, a second ascending channel, a material storing structure and a material returning channel; the tail wall enclosure structure comprises a recovery flue, and a plurality of heat exchange devices are arranged in the recovery flue. By improving the structure of the boiler, the concentration of ash materials in a circulating channel of the boiler is regulated and controlled, and the load in the boiler is conveniently and timely regulated, so that the rapid load change of the CFB boiler is realized, and meanwhile, supercritical and ultra-supercritical main steam parameter regulation can be 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 provides a method for intelligently preventing blockage of an air pre-heater, which belongs to the technical field of intelligent prevention and comprises the following steps: acquiring the synergistic removal effect of a supercritical boiler flue gas treatment facility on sulfur trioxide in different operation modes; the influence effect of the parameter change of the supercritical boiler flue gas treatment facility on the removal rate of sulfur trioxide is analyzed, and an emission reduction scheme is obtained in combination with the synergistic removal effect; and the minimum ash deposition amount under different emission reduction schemes is obtained, a prevention scheme is determined in combination with the current surface blockage condition of the air pre-heater, and reliable use of the air pre-heater is guaranteed.