702 results about "Steam temperature" patented technology

The invention discloses a boiler combustion strategy optimization method, system, equipment and medium, and relates to the technical field of combustion strategy optimization, and the method comprises the steps: employing a width-adaptive triangular convolutional neural network to establish a prediction model of boiler thermal efficiency, NOx emission and superheated steam temperature; constructing a boiler multi-target combustion optimization intelligent agent, and introducing a maximum entropy parameter to obtain all boiler combustion optimal strategies as a target, and obtaining any strategy of which the value is higher than a threshold value; and based on the combustion strategy, outputting a next state through the trained prediction model, obtaining a reward corresponding to the current state, and performing iterative optimization on the boiler multi-target combustion optimization agent according to the current state, the combustion strategy, the next state and the reward corresponding to the current state. And taking the combustion strategy until the optimal reward is obtained as the optimal boiler combustion strategy. On the premise of guaranteeing the stability of the hot steam temperature, the effects of reducing the emission concentration and guaranteeing the stability of the heat efficiency of the boiler are achieved.

The invention relates to the technical field of electric power automation control, and discloses a coordinated control system for a generator set, which adopts an intelligent DCS integrated design architecture and performs real-time data interaction with a set decentralized control system through hard wiring or a communication protocol. According to the system, through deep fusion of a model prediction control algorithm and intelligent DCS integrated design, a boiler-steam turbine dynamic coordination model is constructed, and a control instruction is generated in real time in combination with a rolling optimization strategy. By means of the design, the main steam pressure deviation is controlled within + / -0.2 MPa, and the load response rate reaches 1.5% Pe / s and is improved by more than 40% compared with a traditional system. Particularly, under the working condition of deep peak regulation, by means of decoupling control over a fuel-air supply-water supply loop through a neural network algorithm, main steam temperature fluctuation (within + / -5 DEG C) and reheater spray desuperheating water quantity sudden change (the change rate is smaller than or equal to 10 t / min) are effectively restrained, the control quality of a unit under the conditions of variable loads and variable coal quality is remarkably improved, and the control efficiency of the unit is improved. And the high-standard requirement of the power grid on the AGC performance is met.

Disclosed in the present invention are a main steam temperature control method and system for an incineration boiler of a waste incineration power plant. The method comprises: forming a cascade PID control dual-loop on the basis of a primary desuperheater, a primary superheater, a main PID controller and an auxiliary PID controller, and tuning the cascade PID control dual-loop; obtaining the current main steam flow rate, the current main steam temperature and the current boiler hearth temperature, and the main steam temperature and the boiler hearth temperature after a set delay time; obtaining the current actual waste treatment amount and the density of waste entering the incineration boiler, and calculating a predicted value of the current waste incineration heat; calculating a temperature feedforward value of the main steam temperature; and superimposing the temperature feedforward value and a temperature adjustment value output by the auxiliary PID controller in the cascade PID control dual-loop, generating a control value on the basis of the superimposed value, and controlling the water spraying amount of the primary desuperheater on the basis of the control value. In the present invention, on the basis of conventional PID cascade dual-loop control, correction value feedforward compensation is added to the control loop, thereby effectively improving the stability of the main steam temperature in waste incineration power generation.

The invention relates to the technical field of control regulation, in particular to a supercritical unit variable load rate dynamic compensation control method, which comprises the following steps: acquiring unit operation data, performing credibility restoration, and outputting a credible parameter set; a time sequence mapping table is constructed based on the credible data, and boiler heat storage lag time, steam turbine control valve delay and a steam temperature interstage coupling coefficient are quantified; correcting the boiler water supply feedforward instruction by using the heat storage lag time to generate a compensated water supply instruction; according to the time sequence mapping table and the main steam pressure change rate, a multi-genetic algorithm is adopted to optimize a control valve constraint rule, and a dynamically constrained control valve action instruction is generated; an inter-stage coupling coefficient is called to generate a swing angle compensation amount, and water spraying temperature reduction disturbance is blocked; safety locking parameters are monitored to trigger buffering intervention in a grading mode, and compensation instructions are integrated to implement cooperative correction. The problem of out-of-step response of multiple execution units under the variable load working condition is solved, and the unit adjusting rate and the control stability are remarkably optimized.

The invention discloses a thermal power generating unit main reheating steam temperature wide-load self-adaptive adjusting method and system, relates to the technical field of electric power industry automation and control, and aims at solving the problems that an existing adjusting method is large in steam temperature fluctuation, high in thermal stress and poor in main reheating collaboration under the wide-load working condition. The method comprises the steps of calculating main steam phase saturation and mapping a target value; calculating the maximum change rate based on the thermal physical parameters of the material, and generating a reference track with the limited change rate; the steam phase saturation of the main steam is used as a phase reference, and the reheated steam is controlled to respond according to a preset phase difference; a combustion system, a flue gas temperature adjusting baffle and a temperature reducing water system are cooperatively controlled; the system comprises a vapor phase saturation processing module, a dynamic boundary generation module, a phase coordination control module, an execution mechanism coordination module, a steady state detection module and a mode switching module. Accurate steam temperature adjustment under the wide load is achieved, material thermal stress is reduced, unit operation safety and economical efficiency are improved, and the variable-load operation requirement of the unit is met.

The invention discloses a main steam temperature control method for guaranteeing safe operation of a steam turbine rotor, which relates to the technical field of steam turbines, and comprises the following steps: defining a system state, a temperature control action and a reward function, taking a neural network as an intelligent agent, and interacting with a quick starting process of a steam turbine; in the interaction process, the intelligent agent receives the system state of the steam turbine and outputs a temperature control action; the steam turbine performs temperature adjustment according to the temperature control action and feeds back rewards to the intelligent agent based on a reward function; the intelligent agent evaluates whether the temperature control action is good or bad through rewards until the accumulated rewards converge; and after the accumulated rewards converge, the intelligent agent outputs an optimal temperature control action, and the temperature of main steam in the quick starting process of the steam turbine is controlled through the optimal temperature control action. The main steam temperature can be dynamically adjusted, and the starting time can be remarkably shortened on the premise that the safety of the rotor is guaranteed.

The invention provides an intelligent temperature control method for a corrugating machine, and belongs to the technical field of corrugated paper products.The intelligent temperature control method comprises the steps that a steam temperature sensor set and a linear speed detection device are installed on a corrugating machine production line, and a speed-steam temperature dynamic compensation mathematical model based on nonlinear regression analysis is established; a feedforward control system architecture is constructed to realize real-time calculation and transmission of a steam temperature compensation value, a double-layer game optimization model is established to coordinate steam energy consumption minimization and composite quality optimization targets, and a self-adaptive adjustment algorithm is started according to composite strength and appearance quality feedback signals to dynamically adjust model parameters. Steam temperature coordination control is implemented to optimize temperature distribution, a steam temperature control effect evaluation system is established for real-time evaluation, and the technical problem that in the prior art, steam temperature dynamic compensation control cannot be achieved according to the speed change of a production line in the production process of the corrugating machine is solved.

The invention relates to the technical field of hot-dip galvanized steel pipe surface treatment, and discloses a hot-dip galvanized steel pipe internal blowing steam electric heating control method and system. The method comprises the steps that the outer diameter, the wall thickness, the surface temperature and steel type information of a galvanized steel pipe are collected, a steam temperature demand value is calculated, the input number and the power duty ratio of sectional type electric heating pipes are dynamically adjusted according to the temperature rise demand, and the heating power is corrected in real time through a cascade closed-loop control system; and calculating the solidification speed of the zinc liquid according to the wall thickness, and processing the thin-walled pipe in a pulse injection mode. The technical problems that in the prior art, steam temperature control precision is insufficient, heating power distribution lacks dynamic adaptation, temperature closed-loop control response lags behind, and a zinc layer on the inner wall of the thin-walled pipe is uneven are solved.

The invention discloses a related quantitative analysis method and system based on steam turbine regulating valve opening disturbance, and belongs to the technical field of generator set optimization operation. Sequentially deducing to obtain a first differential equation and a second differential equation based on the steam temperature change when the steam turbine regulates the valve opening disturbance; the function relation between the enthalpy value of the once-through boiler outlet working medium and the temperature and the pressure is established, and a quantitative analysis equation of the steam turbine adjusting valve opening disturbance to the once-through boiler outlet steam temperature is deduced; based on the proportional relation between the first-stage front steam pressure of the steam turbine and the front steam pressure of the adjusting steam valve and the load constant condition of the once-through boiler, a quantitative analysis equation of the opening disturbance of the adjusting steam valve of the steam turbine to the first-stage front steam pressure of the steam turbine is deduced. Through a reasonable simplified formula, the quantitative influence result of the opening degree change of the steam turbine adjusting valve on the outlet steam temperature of the once-through boiler and the first-stage front steam pressure of the steam turbine can be rapidly and accurately obtained, operation personnel can be assisted in optimizing operation, and then safe and economical operation of a generator set is guaranteed.

The utility model discloses a desuperheater, and belongs to the technical field of steam temperature control. The desuperheater comprises a desuperheating pipeline, a hot steam inlet, a desuperheating water inlet, a swirler and a proper-temperature steam outlet, the swirler is provided with a plurality of swirling vanes, the swirling vanes are arranged in the circumferential direction of the desuperheating pipeline by a circle, and the proper-temperature steam outlet is formed in the circumferential direction of the desuperheating pipeline. The radial outer ends of the rotational flow blades abut against the inner wall of the temperature reduction pipeline, and seen from the axial direction of the temperature reduction pipeline, the side edge of each rotational flow blade is completely located in front of or behind the blade face of the adjacent rotational flow blade. And the parallel projection of the swirler in the axial direction of the temperature reducing pipeline is fully distributed on the cross section of the temperature reducing pipeline. Through the arrangement, the desuperheater is beneficial to full mixing of superheated steam and desuperheating water, and the purposes of rapidly cooling and shortening the desuperheating distance are achieved.

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

The invention discloses a deep peak regulation and frequency modulation heat energy storage system and method coupled with a coal-fired unit, and belongs to the technical field of coal-fired unit flexible transformation and power grid regulation. Aiming at the problems that a single fused salt / solid heat storage occupies a large area, the initial investment is high, a steam generation system is complicated, and a conventional coal-fired unit is difficult to meet the requirements that the minimum power generation output of a new generation coal-electricity pilot demonstration unit is less than or equal to 20% Pe, and deep peak regulation is realized to give consideration to primary frequency modulation performance through self or auxiliary regulation as much as possible in the specification of power generation and transformation energy (2025) 363. The system comprises a heat energy storage unit and a coal-fired unit, the heat energy storage unit comprises a demineralized water supply water tank, an electrode steam boiler, a spherical tank and a heat storage type steam temperature increasing device, and the structure of spherical tank flash evaporation steam supply and heat storage temperature increasing sensible heat supplementing is adopted to be matched with steam supplementing of a steam turbine. The combined minimum power generation output of the two can be reduced to 10% Pe, the peak increase output is at least 5.6% Pe, primary frequency modulation is assisted by increasing and decreasing the power consumption of the electrode steam boiler, and new energy consumption is assisted.

The utility model discloses a medium-pressure steam recovery system in the technical field of steam recovery, which comprises a new energy boundary area and a methanol boundary area, a medium-pressure steam pipeline is arranged between the new energy boundary area and the methanol boundary area, and the new energy boundary area comprises a first temperature and pressure reduction station. A new energy internal medium-pressure steam pipeline is arranged at the bottom of the first temperature and pressure reduction station, a first temperature and pressure reduction station medium-pressure steam outlet valve is arranged on the new energy internal medium-pressure steam pipeline, and the left side of the new energy internal medium-pressure steam pipeline is connected with a crude benzene process inlet medium-pressure steam valve through a guide pipe; the system solves the problems that in the process that steam is conveyed to the coking debenzolization process to serve as a heat source of a rich oil heater and a regenerator, due to the fact that the distance is long, the temperature of the steam can be reduced, the requirement cannot be met, and the steam can be used as a heat source of the rich oil heater and the regenerator. And waste is easily caused.

The invention discloses an oil smoke purifier and an oil discharge control method and an oil discharge structure thereof, and the oil discharge control method comprises the following steps: obtaining real-time liquid level information, when the real-time liquid level information is greater than or equal to a preset working liquid level threshold value, controlling a steam switch valve to be opened at a preset initial opening degree, and setting the duration as a preset first working duration; acquiring the real-time temperature of the oil stain and the real-time temperature of the introduced steam; adjusting the actual working opening degree of a steam switch valve based on the real-time oil stain temperature and the real-time steam temperature; and when the real-time liquid level information is smaller than or equal to the preset low liquid level threshold value, the steam switch valve is controlled to be closed by delaying the preset second working duration. According to the method disclosed by the invention, the heating time and process are accurately controlled, so that the oil discharge channel is effectively prevented from being frozen and blocked by oil stains, and unnecessary energy consumption is reduced.

The utility model discloses a hot tank assembly and water purifying equipment, the hot tank assembly comprises a hot tank body, a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged on the hot tank body and is used for detecting the water temperature in the hot tank body; the second temperature sensor is arranged on the hot tank body and used for detecting the steam temperature in the hot tank body, and the hot tank assembly is used for the water purification equipment. According to the hot tank assembly, the hot tank assembly can judge the boiling point of water at the position where the hot tank assembly is located, it is guaranteed that drinking water is boiled, meanwhile, water can be prevented from being repeatedly heated after boiling, the risk that the hot tank assembly and drinking water equipment are damaged can be reduced, and the use feeling of a user is improved.

The invention relates to the technical field of perfume extraction equipment, and discloses a plant natural perfume extracting solution evaporation device which comprises a base, an evaporation tank is arranged on the base, the top of the evaporation tank is communicated with an air outlet pipe, a buffer seat is arranged in the evaporation tank, the buffer seat is connected with a water pump through a feeding pipe, the water pump is installed on the base, and the water pump is connected with the air outlet pipe. The device comprises an evaporation tank, a protruding part is arranged in the evaporation tank, a transmission mechanism is arranged in the protruding part through a buoyancy mechanism, a driving motor is arranged at the top of the evaporation tank, and a puncturing mechanism is jointly connected between the driving motor and the transmission mechanism. By means of buoyancy and a transmission mechanism, puncturing and cleaning automation are achieved, a steam treatment link is newly added, the steam and cold air mixing proportion can be accurately adjusted, the steam temperature is optimized, the product quality is better controlled, stable and efficient operation of the device is guaranteed, and the plant natural perfume extraction effect is comprehensively improved.

This application relates to the technical field of coffee machines, and in particular to a coffee making system, including: a mother and son boiler, an extraction heating boiler, and a steam heating boiler; wherein, the mother and son boiler includes a mother boiler and a son boiler arranged in the mother boiler; the mother boiler is communicated with the extraction heating boiler, and the son boiler is communicated with the steam heating boiler. It can be seen that the mother furnace integrated heating system provided by this application changes the structure of the mother and son boiler in the prior art, that is, it no longer uses the mother boiler to pre-store a large amount of steam for milk frothing and the son boiler to pre-store extraction water, but uses the mother boiler to pre-store extraction coffee water and the son boiler to pre-store warm water for forming steam, that is, reversing the son boiler and the mother boiler, and cooperating with the extraction heating boiler and the steam heating boiler to achieve rapid, efficient and continuous cup output, and it is ready-to-use and does not require waiting. In addition, the water temperature and steam temperature are stable, ensuring the coffee quality. In addition, the overall machine size is small and more energy-saving.

The invention discloses a steam temperature control method for a tower type solar photo-thermal power station, which fuses the control of a hot molten salt delivery pump and the control of inlet hot molten salt regulating valves of a superheater and a reheater according to the control characteristics of a regulating loop so as to effectively relieve the influence of temperature lag. Compared with the prior art, the method provided by the invention is based on an independent and decoupled operation mode of a superheated steam and reheated steam temperature adjusting loop so as to efficiently respond to the requirement of power change of the steam turbine generator unit. Meanwhile, the operation state and the change trend of the superheated steam temperature adjusting loop and the reheated steam temperature adjusting loop can adjust the operation of the hot salt pump flow adjusting loop. In order to organically coordinate the mutual relation, a control method based on the valve position of a regulating valve and the deviation characteristic of a control loop is set, and the valve position relation characteristic of the regulating valve in the superheated steam and reheated steam temperature regulating loop and the deviation state and trend information of the regulating loop are introduced into a combined valve position integrator and a combined monitor; operation of the hot salt pump flow adjusting loop is adjusted in real time through monitoring and judgment of the two.

Provided in the present invention are a primary frequency regulation dynamic simulation method and apparatus based on a thermal power condensate water throttling strategy, which are used for analyzing the dynamic characteristics of a unit when a power plant executes a primary frequency regulation instruction by means of a condensate water throttling strategy after a power disturbance occurs in a power grid. The dynamic characteristics mainly comprise the characteristics of a steam turbine speed governor system, the characteristics of a variable-frequency condensate pump system, the dynamic heat exchange characteristics of a low-pressure heater and extraction steam, the flow characteristics of an extraction steam pipeline, and the output characteristics of a steam turbine body. A moving boundary method is mainly applied to a heat exchange process between condensate water (a cold fluid) and shell-side extraction steam (a hot fluid) in a low-pressure heater. The heat exchange process between the cold and hot fluids can be divided into a superheated section, a phase change section and a subcooled section on the basis of the aggregation state of the extraction steam. When the moving boundary method is applied to a steam turbine regenerative system, the dynamic variation laws of extraction steam temperature and pressure can be more accurately obtained, and the extraction steam pressure on a low-pressure heater side is a key factor in determining the extraction steam flow rate on a low-pressure cylinder side, and is also critical in determining the instantaneous power increment of a steam turbine. Moving boundary method-based frequency regulation dynamic simulation for thermal power condensate water throttling takes into account relatively comprehensive actual process factors, and only one-dimensional modeling along an axial main flow direction is taken into account, thus combining the advantages of fast and accurate simulation. A fast and accurate simulation method is a prerequisite for implementing power grid frequency security analysis. By mastering the dynamic process of power plant load response from the moment a frequency deviation exceeds a dead band to the moment same returns to the dead band, a foundation can be provided for the primary frequency regulation control of power plants and the frequency security analysis of power grids.

The embodiment of the invention relates to the technical field of boiler equipment, and provides a steam boiler real water level identification method and a related device, and the method comprises the steps: obtaining boiler steam temperature data and pressure data; determining a first boiler working state of the steam boiler according to the temperature data and the pressure data; if the first boiler working state is that a boiler burner is started or the power is changed, boiler water level image data are obtained; the real water level of the steam boiler is recognized according to the boiler water level image data, the recognition result of the real water level of the steam boiler is obtained, the working state that a boiler burner of the steam boiler is started or power changes can be recognized according to the temperature data and the pressure data in the boiler, and then the real water level of the steam boiler is recognized according to the boiler water level image data. The real water level of the steam boiler is identified, the false alarm probability of the false water level of a traditional water level gauge of the steam boiler is reduced, and the production efficiency is improved.

The utility model relates to the technical field of honey decrystallization, in particular to an energy-saving honey decrystallization device. According to the technical scheme, the energy-saving honey decrystallization device comprises a steam heating assembly, a steam circulating assembly and a steam input assembly, a steam circulating assembly is arranged at the rear end of the steam heating assembly; high-temperature steam led in from the outside is cooled once through the steam box, the situation that the quality of honey is affected due to the fact that the temperature of the steam is too high is avoided, then the steam enters the steam heating disc along with the feeding pump to be sprayed out upwards, and a honey pot placed above the steam heating disc is heated and dissolved; redundant steam enters the steam circulation bin and then is pumped into the steam circulation bin at the other end through the steam circulation pump, so that steam flow in the steam heating assembly forms stable heating flow, the steam heat utilization efficiency is improved, and energy consumption is reduced.

A steam power cycle thermoelectric decoupling system includes a molten salt heat storage system, a steam accumulator heat storage system, and a preheating system. The steam accumulator heat storage system is taken as a main heat storage component, which solves low heat storage efficiency and high heat storage costs by simply using molten salt. Saturated steam released by the steam accumulator heat storage system is heated to a superheated state by heat stored in the molten salt heat storage system, achieving supplement of the saturated steam released by the steam accumulator heat storage system to the heat supply network, and the preheating system is utilized for solving the problem that the temperature of steam output from the steam accumulator heat storage system is lower than the solidifying point temperature of the molten salt, causing the solidification of molten salt.

The embodiment of the utility model provides a cooking utensil, and belongs to the technical field of cooking, a working space is formed in the cooking container, and the working space comprises a cooking cavity, a mounting cavity, an exhaust cavity and an exhaust port, the pressure limiting valve is located in the working space, at least part of the pressure limiting valve is located in the mounting cavity, and the pressure limiting valve is used for communicating or cutting off the mounting cavity and the cooking cavity. At least part of the temperature measuring device is located in the exhaust cavity, fluid in the exhaust cavity flows to the exhaust port through the temperature measuring device, the arrangement direction of the pressure limiting valve and the temperature measuring device is a preset direction, and the exhaust cavity extends from the pressure limiting valve to the temperature measuring device in the preset direction. According to the cooking utensil, the accuracy of steam temperature measurement can be improved.

The invention discloses a GPC-PID cascade control method for a main steam temperature system of a coal-fired unit based on data driving, which is based on a data driving model and is combined with an implicit generalized predictive control algorithm fused with a stepped thought to realize better main steam temperature control. The method comprises two control processes, in the main control process, a compensation instruction of a main steam temperature set value is obtained by establishing a main steam temperature prediction model; secondly, calculating a desuperheater outlet temperature set value instruction increment according to the desuperheater outlet temperature set value at the previous moment, the main steam temperature and the compensated main steam temperature set value through an implicit generalized predictive control algorithm; in the auxiliary control process, a desuperheater control valve opening degree instruction is obtained through PID calculation according to the obtained desuperheater outlet temperature set value instruction and the desuperheater outlet temperature. According to the method, the main steam temperature control effect can be optimized for a main steam temperature control system with strong nonlinearity and uncertainty, and the method has important significance for improving the rapid load changing capacity of a coal-fired unit.

The invention provides a steam turbine quick starting system and method based on low-pressure rotor impulse rotation, belongs to the technical field of steam turbine operation control, and can at least partially solve the problem that the starting time of a steam turbine is long due to the fact that impulse rotation can only be achieved after sufficient cylinder warming during cold state starting in a starting mode adopted by an existing steam turbine set. The system comprises a steam turbine unit, a conveying pipeline assembly, a reheating temperature and pressure reduction system and a main steam temperature and pressure reduction system, and has the beneficial effects that the system adopts a low-pressure cylinder impulse rotation mode, a steam passage can be rapidly established through the reheating temperature and pressure reduction system and the main steam temperature and pressure reduction system at the initial stage of boiler ignition, and early impulse rotation is achieved; the cylinder warming waiting time is shortened, and the overall starting efficiency of the unit is improved.

The invention discloses a range-extended steam conveying system with a temperature and pressure increasing device and an installation method, and relates to the technical field of steam conveying, the range-extended steam conveying system with the temperature and pressure increasing device comprises a steam conveying pipeline and the temperature and pressure increasing device, and the temperature and pressure increasing device is used for increasing temperature and pressure of steam in the steam conveying pipeline. The steam conveying pipeline comprises an inner pipe, an inner heat preservation layer, a heat preservation interlayer, an outer heat preservation layer and a protection layer which are sequentially arranged from inside to outside, and the heat preservation interlayer is of an arc-shaped structure, located on the top of the inner heat preservation layer and used for supporting the outer heat preservation layer. When the pipe diameter of the steam conveying pipeline is selected, the diameter of the steam conveying pipeline can be reduced to the maximum extent, the investment of the steam conveying pipeline is reduced, and the pipe loss of the steam conveying pipeline under low load is reduced; the heat preservation interlayer of the arc structure is additionally arranged, heat dissipation loss of the upper portion of the steam conveying pipeline can be effectively reduced, meanwhile, the outer heat preservation layer is supported by the heat preservation interlayer, the heat preservation performance of the outer heat preservation layer can be improved, and the service life can be prolonged.

The invention discloses a boiler heating surface soot blowing optimization method based on safety and economy analysis, and belongs to the technical field of coal-fired power plant operation optimization. The method comprises the following steps: acquiring historical operation data from a DCS (Distributed Control System), pre-processing the data, establishing an initial data set, determining a real-time ash and dirt coefficient by judging the load stability of a unit and calculating ideal and actual heat exchange coefficients of a heating surface, identifying an ash and dirt growth prediction model and predicting an ash deposition trend. The optimal soot blowing frequency and duration are solved by taking soot blowing net income maximization as a target and combining engineering experience constraints, the critical soot pollution coefficient is calculated, and soot blowing operation is triggered when the actual soot pollution coefficient exceeds the critical value on the premise that safety parameters such as the main reheat steam temperature and the hearth outlet temperature meet the standard. By accurately predicting the soot deposition state and optimizing the soot blowing strategy, energy consumption is reduced while equipment safety is guaranteed, soot blowing medium waste is reduced, and the economical efficiency and safety of boiler unit operation can be remarkably improved.

The invention provides a boiler combustion optimization method. The boiler combustion optimization method comprises the steps that operation parameters of all key nodes in the combustion process are collected; determining an energy input item, an energy output item and a heat storage energy change item based on the collected operation parameters, establishing a load prediction model, and predicting a load change trend at a future preset moment; a fuel quantity optimization model based on the load change rate is established, the fuel conveying process is optimized, and the ideal fuel quantity is generated; an air quantity optimization model based on the flue gas oxygen content is established, the combustion process is optimized, and the ideal air quantity is generated; establishing a coal-water ratio optimization model based on the steam temperature, optimizing a steam generation process, and generating an ideal coal-water ratio; and controlling a corresponding execution mechanism to act according to an optimization result to realize optimization control of the combustion process of the boiler. By constructing the load prediction model and the combustion parameter optimization model, the dynamic optimization of the fuel quantity, the air quantity and the coal-water ratio is realized, the response speed of the boiler to the load change is improved, and the combustion efficiency and the steam quality are improved.

The invention discloses a closed steam Rankine cycle power system configuration optimization and variable load control method based on heat storage feed-forward, and the closed steam Rankine cycle power system configuration optimization comprises the steps: adding a water supply bypass valve and a water storage tank in a system; an inlet water temperature sensor and an outlet steam temperature sensor are arranged at an inlet and an outlet of a boiler respectively, a fuel flow meter is arranged at an outlet of a fuel regulating valve, a water flow meter is arranged at an outlet of a main water supply valve, a power sensor is arranged at a rotating shaft of a turbine, and the water supply flow regulating capacity and the dynamic stability capacity of the system are improved through system configuration optimization. A system variable load control strategy after configuration optimization is further provided, a water supply bypass valve is adopted to control the system operation load, a fuel regulating valve is adopted to control the boiler outlet steam temperature, and the deviation between the steady-state heat storage capacity and the real-time heat storage capacity of the boiler is used as a fuel regulating valve auxiliary control signal. The system effectively solves the problems of overshoot of the steam temperature of the boiler outlet and low variable load rate of the system, and improves the safety and the rapid variable load capacity.

The invention discloses a low-load flue gas recirculation system for a circulating fluidized bed boiler. The low-load flue gas recirculation system comprises a hearth, and one end of a fifth pipeline is fixedly connected to the hearth; according to the invention, a part of flue gas is led out from the opening of the outlet flue of the induced draft fan and is introduced into the fourth pipeline, primary air heated by the first fan heater and the second fan heater is mixed, then pressurized by the first primary air fan and the second primary air fan and heated by the first preheater and the second preheater, and then enters a boiler air chamber; a dynamic parameter adjusting mechanism in the self-adaptive adjusting system adopts a feedforward-feedback composite control structure, the reheating steam temperature can be increased by about 2 DEG C every time the recirculation air volume is increased by 1%, the NOx concentration fluctuation is predicted in real time by applying an LSTM neural network, PID parameters are dynamically corrected through fuzzy reasoning, fuel characteristic changes are adapted, and the reheating steam temperature is increased by about 2 DEG C; and the amount of recycled flue gas is properly adjusted according to the load change to ensure that the unit is in the deep peak regulation load interval, and the unit operates to realize stable ultralow emission of NOx.