25 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 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 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 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 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 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 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.

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.

The present application relates to the technical field of CFB boiler, in particular to supercritical and ultra-supercritical CFB boiler capable of quick load change, regulation and control method, the boiler comprises: a hearth device, including a hearth body and an ignition combustion assembly; an external circulation loop, including a cyclone separator and an integrated storage and return device, the integrated storage and return device includes a direct return mechanism and a storage and return mechanism; the direct return mechanism includes a first descending channel, a first ascending channel and a return channel, the storage and return mechanism includes a second descending channel, a second ascending channel, a storage structure and a return channel; a tail wall structure, including a recovery flue, a plurality of heat exchange devices are arranged in the recovery flue. By improving the structure of the boiler, the concentration of ash material in the circulating channel of the boiler is regulated and controlled, the load in the furnace is adjusted in time, so that the quick load change of the CFB boiler is realized, and the supercritical and ultra-supercritical main steam parameter adjustment can be realized.

The application discloses a 700MW ultra-supercritical CFB boiler SUPER304H stainless steel thin-wall pipe and flat steel splicing and arranging submerged arc welding process, which comprises the following steps: material selection; welding gun bending modification; pretreatment; splicing and assembling; reverse half-moon type welding gun angle setting; submerged arc welding parameter control; nondestructive testing. In the application, the submerged arc welding gun is set as a reverse half-moon type angle, the end of the welding wire is inclined towards the flat steel side, the welding wire extension line is projected on the flat steel surface, the included angle between the welding gun axis and the axis normal plane of the stainless steel thin-wall pipe is 10-14 DEG, and the distance between the welding wire and the flat steel surface is 4-6 mm; the flux GXS-340 is used, CaF2 is greater than or equal to 60%, and the particle size is 10-60 meshes. The application effectively solves the problems of easy burning through, large tendency of hot crack and poor weld forming of the stainless steel thin-wall pipe welding, and the welding qualified rate is increased by 10%, and the production efficiency is increased by 20%.

The invention discloses an ultra-supercritical boiler three-stage overheating desuperheating water cooperative control system and method, and relates to the field of thermotechnical automatic control. The steam specific enthalpy of an outlet of a low-temperature superheater is controlled through first-stage desuperheating water; the second-stage desuperheating water mainly controls the steam temperature of an outlet of the platen superheater and assists in adjusting the opening range of a third-stage desuperheating water flow adjusting valve; and the third-stage desuperheating water still controls the superheated steam temperature of the boiler. In the scheme, compared with the method for controlling the steam temperature of the outlet of the low-temperature superheater through the first-stage superheated desuperheating water, the method for controlling the specific enthalpy of the steam of the outlet of the low-temperature superheater can keep high control precision during large-range variable-load operation of a unit, and the overall control effect is good. And the second-stage overheating desuperheating water is controlled through event driving, the opening degree of the third-stage overheating desuperheating water regulating valve can be kept within a reasonable range within the full-load range, and the overall control quality of the overheating steam temperature system within the full-load range is improved.

The invention discloses a supercritical boiler operation parameter control method and device based on wall temperature deviation, and relates to the technical field of supercritical boiler thermal control and safe operation. According to the main technical scheme, a wall temperature deviation analysis model is trained in advance and used for analyzing the optimal mapping between non-adjustable parameters and the wall temperature deviation and related adjustable parameters under the condition that the wall temperature deviation does not exceed the limit, and in the actual working condition of the supercritical boiler, if it is monitored that the wall temperature deviation of any wall surface water cooling wall exceeds a preset critical value, the wall surface water cooling wall is determined to be the wall surface water cooling wall. If not, the wall temperature deviation analysis model is triggered to process the non-adjustable parameters so as to predict the minimum wall temperature deviation value and the target value of the corresponding adjustable parameter under the condition that the wall temperature deviation does not exceed the limit, the minimum wall temperature deviation value and the target value serve as the upper limit standard for quantitatively adjusting the adjustable parameter, and the actual parameter value of the current adjustable parameter is automatically controlled and adjusted. The wall temperature deviation of the water-cooled wall is effectively and timely reduced, and the wall temperature deviation of the four-wall water-cooled wall is ensured to be within a safety allowable value.