769results about "Boiler control" patented technology

The invention discloses a two-phase cold plate liquid cooling ORC waste heat recovery and photovoltaic cooperative energy supply system and method, and relates to the technical field of energy management and waste heat utilization. The two-phase cold plate liquid cooling ORC waste heat recovery and photovoltaic cooperative energy supply system and method comprises the following steps that S1, thermal parameters and electric power states related to cooperative energy supply are collected, and a thermoelectric cooperative input data set is constructed and preprocessed; s2, the supply and demand difference of the high-temperature steam in the main condensation branch and the ORC branch is recognized; s3, coordinating a photovoltaic power supply structure and a cooperative energy supply sequence, and judging the matching degree of cooperative energy supply to a load; and S4, evaluating a cooling, heating and power cooperation and double-source coupling state in combination with a load matching condition and an output behavior. The problems that in an existing two-phase cold plate liquid cooling structure, high-temperature steam is not recycled, photovoltaic power generation does not participate in linkage energy supply, the power source is single, waste heat waste is serious, and energy collaboration is insufficient are solved.

The invention relates to the technical field of boiler control, and discloses a gas-fired boiler starting control method and system. The method comprises the following steps: acquiring initial operation parameters such as hearth pressure, water inlet temperature, flue gas oxygen content and fuel valve opening of the gas-fired boiler, establishing a thermodynamic state model in a starting stage according to the initial operation parameters, and dividing dynamic response thresholds of different load intervals; and calculating a theoretical fuel supply rate of the combustor based on the model, generating and dynamically updating a fuel supply correction coefficient in combination with a threshold value, synchronously marking key nodes according to abnormal distribution of hearth temperature, and adjusting a spatial air distribution strategy of the combustor. And after the correction coefficient is subjected to multi-stage buffer smoothing, a fuel control instruction is output to an executing mechanism. And switching to steady state control after the boiler reaches the preset load. The method adapts to the characteristics of a power plant unit, so that the starting process is more stable, the damage to a heated surface and pollutant emission are reduced, and rapid grid connection is assisted.

The invention provides a coal-fired boiler digital twin modeling and intelligent control method, system, equipment and medium, and belongs to the technical field of thermal equipment intelligent control. The method comprises the steps that coal element analysis data, boiler operation parameters and environment parameters of a coal-fired boiler are collected in real time and preprocessed; calculating an external heat source sum and a heat loss sum, and outputting boiler heat efficiency; a twinborn model is constructed, model parameters are calibrated through data collected in real time and calculated boiler thermal efficiency, and boiler indexes are dynamically simulated and output; taking the collected data and the analog output boiler indexes as input characteristics, predicting boiler operation parameters through an LSTM model, generating an optimization control instruction by adopting a multi-objective optimization algorithm, inputting twin model simulation, outputting prediction parameters, and executing the control instruction when the prediction parameters meet preset constraints; and updating LSTM model training data according to the operation result. Intelligent monitoring optimization of the boiler is achieved, and efficiency, safety and environmental protection performance are improved.

The invention provides an optimization method of a magnesium slag sensible heat recovery system, which comprises the following steps: acquiring particle size distribution data of magnesium slag particles, and judging whether the problem of non-uniform particle size distribution exists or not according to a preset particle size threshold value; aiming at the problem of non-uniform particle size distribution, magnesium slag particles are classified by adopting a clustering algorithm, and the distribution areas of large particles and small particles are determined; according to the distribution area of the large particles, the rotating speed of the cooling roller is dynamically adjusted, and the accumulation probability of the large particles in the roller is reduced; the temperature change trend of the inner wall of the cooling roller is monitored in real time, and if it is detected that the local temperature abnormally rises, it is judged that local hot spots exist; when a local hot spot is detected, a spraying cooling system in the roller is started, and intensified cooling is conducted on a local area; pressure and temperature data of high-pressure and high-temperature water are collected in real time through a pressure sensor and a temperature sensor, and whether fluctuation exists or not is judged.

The invention relates to a fused salt heat storage system based on heat energy grading matching. The system comprises a first-stage heat exchange unit, a second-stage heat exchange unit, a third-stage heat exchange unit and a mixing unit, and the first-stage heat exchange unit comprises a first-stage fused salt heat storage loop and a first-stage heat exchange adjusting valve and is used for absorbing and storing high-grade heat of exhaust gas of an exhaust pipeline of a boiler furnace; the second-stage heat exchange unit comprises a second-stage fused salt heat storage loop and a second-stage heat exchange regulating valve and is used for absorbing and storing high-grade heat of main steam extraction of a main steam extraction pipeline of a high-pressure cylinder of the steam turbine; the third-stage heat exchange unit comprises a third-stage fused salt heat storage loop and a third-stage heat exchange regulating valve and is used for absorbing and storing low-grade heat of air exhaust of an intermediate-pressure cylinder of an air exhaust pipeline of the intermediate-pressure cylinder of the steam turbine; the mixing unit mixes the three kinds of exhaust heat and outputs working medium fluid meeting the target temperature so as to adapt to different preset operation working conditions of the thermal power generating unit. Therefore, heat energy can be stored and released in a gradient mode through the system, wide-temperature-range efficient utilization is achieved, and the flexibility and energy efficiency of the thermal power generating unit are improved.

The invention discloses a fused salt steam generation system and a control method thereof. A high-temperature molten salt tank, a salt feeding pump, a molten salt channel of a second-stage superheater, a molten salt channel of a first-stage superheater, a molten salt channel of an evaporator, a molten salt channel of a preheater and a low-temperature molten salt tank of the system are communicated in sequence; the water supply end, the water supply pump, a steam-water channel of the preheater, the steam pocket, the pressure regulating valve, a steam-water channel of the first-stage superheater, the water spraying and temperature reducing device, a steam-water channel of the second-stage superheater and the steam removal end are sequentially communicated, and a descending pipe and an ascending pipe of the steam pocket are communicated with a steam-water channel of the evaporator. The control method aims at the system. The method has the advantages that the steam pocket pressure is actively adjusted during load rising, the liquid working medium is flashed, a load instruction can be quickly responded, steam is stably generated according to the instruction and merged into the steam turbine, and the stability and safety of the steam turbine are improved; the steam pocket of the evaporation system is used as steam storage equipment, so that an independent steam storage pocket is prevented from being arranged in the evaporation system, the cost is reduced, and the control logic is simplified.

The invention relates to the technical field of peak regulation of coal-fired power units, and discloses a self-adaptive regulation method and system for full-load peak regulation of a coal-fired power unit. The method comprises the steps of collecting unit operation parameters such as boiler temperature, turbine rotating speed and generator voltage, and power grid peak regulation instructions such as real-time load demand and predicted load fluctuation; analyzing a peak regulation state based on the collected data, and dividing the peak regulation state into three types of stable operation, transition regulation and limit peak regulation; then calculating an adjustment characteristic quantity according to the current state and the operation parameters, wherein the characteristic quantity reflects the matching relationship between the unit performance and the peak regulation requirement; generating a plurality of groups of adjustment schemes including combustion optimization, steam adjustment and power control based on the characteristic quantity and the peak regulation instruction; and selecting and executing an optimal scheme by evaluating indexes such as efficiency loss, stability influence and maintenance cost. The method can dynamically respond to the load change of the power grid, accurately adapt to the peak regulation requirement in the full load range, and enable the peak regulation of the unit to be more flexible and harmonious.

An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. The delivered heat which may be used for processes including power generation and cogeneration. In one application, the energy storage system provides higher-temperature heat to a conventional lower-temperature heat source to boost the temperature of a thermal power cycle working fluid to a turbine, thereby increasing efficiency of the power cycle.

The invention relates to the technical field of thermal power generation, in particular to a closed circulation cold end optimization method, device and system, and the method comprises the following steps: obtaining the historical operation data of a unit from a power plant monitoring information system, the data comprises circulating water flow, circulating water inlet temperature, circulating water outlet temperature, condenser backpressure water pump motor current, generator power, medium and low pressure heat supply steam flow, condenser steam-water temperature and condenser water inlet and outlet pressure; s2, performing abnormal value processing on the data obtained in the step S1, namely screening out an abnormal value, and repairing and filling the abnormal value by using an interpolation method; based on the actual condition of the power plant, the unit load and the steam admission amount of the condenser are fitted through a large amount of historical data in the step S2; the total power for starting different numbers of circulating water pumps and fans and the water flow corresponding to the circulating water pumps are determined according to the historical data in the step S2; respectively establishing a condenser model and a cooling tower model; constructing a circulating cooling system model, coupling the condenser model and the cooling tower model, carrying out iterative calculation until convergence or reaching the maximum number of iterations, and obtaining the condenser outlet water temperature, the cooling tower outlet water temperature, the condenser back pressure, the vacuum degree and the power generation power; fitting a correction coefficient curve by referring to the technical specification of a power plant and combining the historical data in the step S2 with the condenser backpressure-generated power correction coefficient graph; and calculating the generated power and the net output power according to the unit load and the auxiliary machine consumption, and outputting an auxiliary machine configuration scheme corresponding to the maximum net power.

The invention belongs to the field of boiler waste heat utilization, and particularly discloses an alcohol-hydrogen fuel mixed combustion system utilizing boiler waste heat, which comprises a methanol cracker unit, a methanol supply unit, a methanol cracked gas supply unit, an alcohol-hydrogen burner unit and a smoke exhaust steam supply unit, the methanol cracker unit comprises a methanol cracker, a methanol inlet pipe, a cracked gas outlet pipe, a smoke exhaust inlet flange, a smoke exhaust outlet flange, a methanol shell side area and a smoke exhaust pipe side area, a plurality of heat exchange pipes are uniformly distributed in the smoke exhaust pipe side area, and the methanol inlet pipe is used for connecting the methanol supply unit and the methanol shell side area; the exhaust smoke inlet flange is used for connecting the methanol cracker unit and the exhaust smoke steam supply unit, and the methanol supply unit and the methanol cracked gas supply unit are both used for connecting the methanol hydrogen burner unit and the methanol cracker unit. By means of the self-designed methanol cracker combustion loop, liquid methanol and methanol cracking gas can be combusted at the same time, and the energy utilization rate is greatly increased.

The embodiment of the invention discloses a pressure control method and system for a once-through steam generator of a nuclear reactor, and relates to the technical field of nuclear power. Determining power deviation according to the operation power and the secondary circuit load; according to the power deviation, the rated power corresponding to the nuclear reactor and the rated feed water flow corresponding to the once-through steam generator in the nuclear reactor, pressure regulation information is determined; and adjusting the pressure of the once-through steam generator according to the pressure adjusting information. According to the embodiment of the invention, a PID controller is not needed in the process of determining the pressure regulation information, but the pressure regulation information determined based on the power deviation directly acts on the feed water flow regulation valve, so that rapid and accurate OTSG pressure control can be realized.

The invention discloses a coal-fired power plant carbon emission intelligent control method and system based on machine learning, and relates to the technical field of coal-fired power plant carbon emission, and the method comprises the four steps: building a three-level sensing network to collect carbon flow data, importing various parameters to construct a carbon flow digital twinborn body, building a real-time mapping link, and obtaining twinborn body boiler data; establishing a solid waste related mapping model, and calculating and outputting a coal blending combustion proportion through an optimal solution; predicting the carbon release amount within 5 minutes in combination with boiler data and a blending combustion ratio, constructing a carbon capture agent model, and judging whether elastic adjustment is triggered or not through an improved Sarsa algorithm game; and analyzing a quota consumption rule based on prediction data, predicting a carbon price, optimizing multiple targets and analyzing a Pareto optimal strategy. According to the method, full-chain collaborative management and control are realized, the carbon emission control precision and intelligent level are improved, environmental protection standard reaching, quota management and cost control are balanced, and low-carbon and efficient operation of a power plant is assisted.

The invention discloses a waste heat boiler power generation optimization method for a gas-steam combined generator set, and the method comprises the steps: deeply cooling the exhaust gas temperature to below 75 DEG C through a multi-stage anti-corrosion heat exchange device, and carrying out the heat exchange through an intelligent control heat medium water circulation loop; the recycled heat is distributed to natural gas preheating, refrigeration, heat supply, air preheating and the like according to the priority in a cascade mode. According to the system, efficient deep recovery and comprehensive utilization of flue gas waste heat are achieved, the energy efficiency and economical efficiency of the unit are remarkably improved, and safe and reliable operation of the system is ensured through intelligent anti-corrosion control.

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 disclosure provides a coal conveying control system and method for a thermal power plant. The system includes: a model prediction module, used for building an operating load prediction model, and obtaining a boiler operating load optimal value; a load calculation module, used for drawing an operating load difference value curve, and determining a boiler coal consumption change amount; a speed control module, used for determining a coal conveying amount of a coal conveying system, and controlling operating speed of a coal conveying belt according to the coal conveying amount; a quality calculation module, used for calculating boiler operating efficiency, and determining a coal quality parameter according to the boiler operating efficiency; a fineness control module, used for determining a coal particle parameter, setting target coal particle fineness according to the coal particle parameter, and controlling a screening and crushing device according to the target coal particle fineness.

The invention provides an intelligent tracking and early warning method for a whole-flow stress state of steam boiler equipment, which relates to the field of steam boiler equipment monitoring and comprises the following steps: acquiring real-time data, calculating instantaneous operation parameters, constructing a stress state association diagram and generating a stress feature vector; determining a state equation and an observation equation, calculating stress state parameters in combination with a Kalman filter, dividing the stress state parameters into a primary stress chain and a secondary stress chain, evaluating the overall stress state, and generating early warning information when an evaluation value exceeds a safety threshold value. According to the method, the boiler stress state can be accurately tracked, the early warning accuracy is improved, and the equipment fault risk is reduced.

The invention discloses a large power station boiler inferior coal low-nitrogen combustion optimization control system and method based on machine learning and multi-objective optimization, and relates to the technical field of coal-fired power generation and clean combustion control. The control system is composed of a combustor subsystem, a detection subsystem and a control subsystem, the combustor subsystem constructs a subarea air supply structure with stable combustion at the bottom layer, low nitrogen at the middle and upper layers and burnout at the upper part through layered combustors and OFA nozzles, and the detection subsystem completes online monitoring of coal quality and online analysis of combustion state parameters; and the control subsystem comprises coal quality adaptive decision, multi-objective optimization and closed-loop feedback. According to the control method, inferior coal is recognized through machine learning, layered air distribution is activated in a self-adaptive mode, the optimal air volume and the rotational flow angle are optimized and solved online with efficiency and NOx as multiple targets, and finally precise execution and fine adjustment are conducted through closed-loop feedback. According to the invention, wide-load stable combustion, continuous low NOx level and burnout degree improvement can be realized, and the method is suitable for engineering application of combustion of inferior coal in a large-scale unit.

The embodiment of the present disclosure provides a molten salt-based gas-steam combined heat storage system and a capacity calculation method. The system comprises a gas turbine, a boiler, a gas heat exchanger, a steam heat exchanger, a high-temperature molten salt storage tank and a low-temperature molten salt storage tank. The outlet of the gas turbine is connected with the inlet of the flue of the boiler. The gas heat exchanger is connected with the flue between the gas turbine and the high-temperature reheater and the high-pressure superheater in the boiler. The steam heat exchanger is connected with the steam-water pipeline between the high-pressure superheater and the high-pressure drum and the low-pressure drum in the boiler. The low-temperature molten salt storage tank is connected with the high-temperature molten salt storage tank through a molten salt conveying pipeline. The molten salt conveying pipeline is sequentially connected with the steam heat exchanger and the gas heat exchanger. The low-temperature molten salt is heated to high-temperature molten salt when passing through the steam heat exchanger and the gas heat exchanger along the molten salt conveying pipeline. The system realizes reasonable distribution of steam flow and gas flow, significantly improves the heat exchange efficiency of the heat storage heat exchanger, improves the energy storage density per unit mass of the molten salt heat storage system, and reduces the cost.

The invention provides an anti-dry-burning control method of an evaporator and cooking equipment, and relates to the technical field of smart home, the method comprises the following steps: monitoring a temperature parameter of the evaporator through a temperature sensor in response to a starting operation for the evaporator; calculating a slope parameter corresponding to the temperature parameter; the working state of the evaporator is determined according to the temperature parameter and the slope parameter; and determining a water supplementing strategy of the evaporator based on the working state. According to the anti-dry-burning control method for the evaporator and the cooking equipment, the starting operation for the evaporator can be responded, and the temperature parameter of the evaporator is monitored through the temperature sensor; calculating a slope parameter corresponding to the temperature parameter; the working state of the evaporator is determined according to the temperature number and the slope parameter; the water supplementing strategy of the evaporator is determined on the basis of the working state, so that water can be supplemented to the evaporator in time in the corresponding working state, the phenomenon of dry burning of the evaporator is avoided, and the reliability requirement of cooking equipment such as a steaming oven for dry burning prevention is met.

The invention relates to an electric heating fused salt heat storage-heat supply system for quickly absorbing wind and light output fluctuation. The electric heating fused salt heat storage-heat supply system comprises a low-temperature fused salt tank, a high-temperature fused salt tank, a multi-stage electric heater array, a fused salt pump, a regulating valve, a switch valve, a temperature measuring point, a preheater, an evaporator, a superheater, a water supply pump, a water supply unit and a matched pipeline. The system adopts hierarchical control: a first-stage electric heater array operates at a constant flow within a set time so as to respond to power fluctuation from a second stage to a minute stage; and the second-stage electric heater array is used for coping with minute-level to hour-level power fluctuation by adjusting the flow of the molten salt and stabilizing the temperature of a molten salt outlet. In the occasion where the temperature of the high-temperature molten salt needs to be strictly controlled, the system can guarantee the temperature quality of the high-temperature molten salt by additionally arranging a molten salt loop. The heat sink effect of the molten salt in the low-temperature molten salt tank can effectively buffer temperature sudden change and stabilize a flow field. Qualified high-temperature fused salt can be continuously output under high-fluctuation electric energy input, and steam is stably supplied.

The invention provides a method, device and equipment for controlling the steam drum water level of a gas-steam combined cycle unit. The method comprises the steps that the opening degree of an inlet guide vane of a gas compressor, the turbine exhaust temperature, the feed water flow, the steam flow, a steam drum water level set value and the steam drum water level are obtained in real time; according to the opening degree of an inlet guide vane of a gas compressor and the exhaust temperature of a turbine, the gas turbine side feed-forward control quantity is determined; according to the steam drum water level set value and the steam drum water level, a first PID controller is adopted to determine an original feed water flow set value; according to the feed water flow, the steam flow, the original feed water flow set value and the gas turbine side feed-forward control quantity, a second PID controller is adopted to determine a first feed water adjusting valve opening instruction; and adjusting the opening degree of the feed water adjusting valve according to the first feed water adjusting valve opening degree instruction, and controlling the steam drum water level of the gas-steam combined cycle unit. According to the invention, reliable guarantee is provided for safe and efficient operation of the unit through a cooperative regulation mechanism of the gas turbine side feed-forward control quantity and three-impulse control.

The systems and methods of the invention pertain to analyzing steam generator tube data for the detection of wear. Further, the invention is capable of performing a comparison of current tube signal data to baseline or historic tube signal data, e.g., from previous and / or the first, in-service inspection of the steam generator. The systems and methods are automated and can generate results to show potential tube-to-tube contact wear areas as well as the progression of tube-to-tube gap reduction within a steam generator tube bundle. In certain embodiments, the invention is capable of comparing current and historical eddy current data to determine the difference that may be related to degradation or other interested phenomena, and of processing and trending historical comparison results to establish normal variance and detect abnormal variances.

The application relates to the technical field of household appliances, and particularly discloses a control method and device of a cooking equipment, a storage medium and the cooking equipment, wherein the cooking equipment comprises a combustion chamber, the combustion chamber is provided with a burner and a steam generator, the method comprises the following steps: obtaining combustion state information of the burner in an operation process and environment state information of the combustion chamber; determining a flame state of the burner according to the combustion state information and the environment state information; and controlling at least one of the burner and the steam generator according to the flame state, so as to maintain the burner in a safe and stable operation state. According to the control method, the combustion state of the burner and the environment information of the combustion chamber are obtained in real time, the flame state is determined after fusion analysis, the burner or the steam generator is intelligently controlled according to the flame state, the burner is ensured to be always in a safe and stable operation state, the reliability and the service life of detection can be improved in a high-humidity environment, and the environment change is self-adapted.

This invention provides an intelligent front-end data acquisition system for boilers, comprising: a detection module, a data acquisition module, and a monitoring module; the detection module is used to acquire unit temperature data; the data acquisition module is a YS-24D data acquisition box, which is used to acquire data from the detection module. This invention provides an intelligent front-end data acquisition system and device for boilers, wherein the data acquisition module uses the YS-24D data acquisition box to acquire data from the detection module at unit temperature measurement points. The YS-24D data acquisition box is high-performance and highly reliable, with a hardware design employing a 32-bit low-power ARM processor, high integration, few peripheral components, high reliability, fast processing speed, high resolution, and reliable and accurate data. It uses a high-performance, high-precision 24-bit A / D converter, with all 24 channels being independent fully differential input loops, providing high resolution, low drift, and high stability.

The application provides a coupling system and a control method for improving the variable load rate of a secondary reheat unit integrated with a medium-temperature energy storage, wherein the medium-temperature energy storage system is connected with the high-pressure cylinder outlet through a high-pressure cylinder outlet steam extraction valve during the energy storage process, is connected with the deaerator outlet through a pressure relief valve, is connected with the feed water pump outlet through a deaerator outlet regulating valve during the energy release process, and is connected with the boiler feed water inlet through a pipeline, so as to form a secondary reheat unit integrated with the medium-temperature energy storage; and a load splitting method is provided, which splits the whole unit load instruction into a medium-temperature energy storage system load instruction and a secondary reheat unit boiler coordination system load instruction, and the medium-temperature energy storage system load instruction is realized through high-pressure cylinder exhaust valve opening degree control and deaerator outlet regulating valve opening degree control in the load decreasing and increasing processes; through the coupling system and the load splitting method, the time-space transfer of the unit energy in the variable load process is realized, the variable load rate of the secondary reheat unit is improved, and the flexibility of the unit is enhanced.

The invention discloses a veterinary drug production steam monitoring system and method, and relates to the technical field of veterinary drug production steam monitoring, and the method comprises the steps: collecting an original data set containing real-time steam pressure, saturated steam temperature and steam dryness instantaneous values through a plurality of sensing nodes disposed in a steam pipe network; inputting the pressure and temperature data into a steam state calculation model, and generating a steam specific enthalpy value, an entropy value and a superheat degree value of each pipe section of the pipe network; starting a periodic dryness compensation process according to the comparison of the dryness instantaneous value and historical data, and generating a dryness adjustment instruction sequence based on the current working condition; and constructing a steam energy distribution diagram by using the obtained thermodynamic state parameters, performing dynamic optimization by combining a dryness adjustment instruction sequence, and finally generating steam supply strategies for different production links. According to the method, global reconstruction of the thermodynamic state of the pipe network and prospective dynamic regulation and control of the steam dryness are achieved, and the accuracy and stability of steam energy utilization in the veterinary drug production process are improved.

To provide a control method and a control device for a boiler capable of suppressing an air amount of the entire boiler even when using fuel gas of which calorie variation is large and a theoretical air amount changes.SOLUTION: A control method is for a boiler that simultaneously burns a plurality of fuel gases with calories different from each other. The control method for the boiler includes a control step of controlling an air amount to be supplied to each of the fuel gases on the basis of a measurement value of an oxygen concentration in exhaust gas of the boiler and a set value of a predetermined target oxygen concentration. The control step includes a step of increasing the air amount to be supplied to the fuel gas with low calorie when the measurement value is below the set value and reducing the air amount to be supplied to the fuel gas with high calorie when the measurement value exceeds the set value.SELECTED DRAWING: Figure 2

A system, for recirculating exhaust gas includes a combined cycle power plant including a heat recovery steam generator (HRSG), a gas turbine system, and an exhaust gas recirculation assembly downstream from the HRSG for receiving the exhaust gas. The exhaust gas recirculation assembly includes a direct contact cooler (DCC) in flow communication with the gas turbine system. The system also includes a computing device(s) in communication with the power plant. The computing device(s) is configured to control the combined cycle power plant by performing processes including measuring a characteristic of the exhaust gas downstream from the exhaust gas recirculation assembly and comparing the measured characteristic of the exhaust gas to a predefined characteristic threshold or a predefined characteristic range for the exhaust gas. The computing device(s) also performs processes including adjusting operational parameters of the exhaust gas recirculation assembly, and / or a distinct portion of the combined cycle power plant.

The application discloses a steam generator with multiple modules and a control method. The steam generator comprises a first steam generating unit and a second steam generating unit, the first steam generating unit is provided with a first steam outlet, the second steam generating unit is provided with a second steam outlet, and the first steam outlet and the second steam outlet are in time-sharing switchable communication with a steam discharge main channel; one of the first steam generating unit and the second steam generating unit is in communication with the steam discharge main channel to discharge steam, and the other is disconnected from the steam discharge main channel to generate and accumulate steam, and the states of the two are time-sharing switched; the steam generating unit in the steam discharging state is powered off, and steam output is maintained by using waste heat. The steam generator and the control method provided by the application can work with the power consumption value of a single steam generating unit, and continuous and stable high-pressure steam can be provided through asynchronous working and timely switching without increasing the total power consumption of the steam generating unit.

The invention discloses a flow and pressure detection system of a biomass boiler. The flow and pressure detection system comprises a fuel information acquisition module, a combustion data monitoring module, a dynamic analysis module, a model construction module and a central control regulation module, the fuel information acquisition module is used for acquiring static biomass fuel information and dynamic biomass fuel information; the combustion data monitoring module is used for monitoring the combustion reaction of biomass fuel in the boiler; the dynamic analysis module is used for analyzing the biomass fuel information and generating biomass fuel frequency conversion data information; the model construction module is used for constructing a biomass boiler flow-pressure parameter linkage model; and the central control adjusting module is used for carrying out real-time detection and dynamic adjustment on flow parameters and pressure parameters of the biomass boiler. By detecting and monitoring the flow and pressure of the biomass boiler, the combustion performance and stability of the biomass boiler are improved, and the use cost is saved.