232results about "Superheating control" patented technology

This invention discloses a supercritical carbon dioxide cycle generator set water spray desuperheating system, comprising a supercritical carbon dioxide cycle power generation system and a water spray desuperheating system; the supercritical carbon dioxide cycle power generation system includes a heater, a screen-type superheater, a final-stage superheater, and a turbine; the water spray desuperheating system includes a first desuperheating water injection point, a second desuperheating water injection point, and a liquid-water separation system; the heater outlet is sequentially connected to the turbine inlet via the first desuperheating water injection point, the screen-type superheater, the second desuperheating water injection point, and the final-stage superheater; the turbine outlet is connected to the inlet of the liquid-water separation system; the liquid outlet of the liquid-water separation system is connected to the first and second desuperheating water injection points; and the gas outlet of the liquid-water separation system is connected to the heater inlet. This system can solve various problems caused by carbon dioxide desuperheating.

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 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.

This invention belongs to the field of heat exchange technology, specifically relating to a steam comprehensive utilization all-contact desuperheater, including a desuperheater body, a water inlet pipe, a drain port, desuperheater inlet and outlet, and a desuperheating atomization unit. The desuperheater body contains a buffer impeller, a baffle plate, and a protective chamber. The desuperheating atomization unit includes a mounting frame, a recessed splash guard, a perforated plate, and a reaction ring. After being buffered by the buffer impeller, the superheated steam directly contacts the uniform water film on the surface of the reaction ring along the opening direction of the protective chamber for heat exchange, resulting in complete vaporization of the desuperheating water. The steam is discharged after water droplets are separated by the baffle plate, and the condensate is collected and discharged from the desuperheater outlet for subsequent treatment. This invention improves heat exchange efficiency through uniform water flow distribution, and the modular design of the desuperheating atomization unit facilitates maintenance.

The invention provides an integrated temperature and pressure reduction device based on pressure control and a working method, and belongs to the technical field of steam utilization. The problems that in the prior art, temperature and pressure reduction operation of steam is difficult to achieve efficiently and accurately, and the steam utilization efficiency and safety are affected are solved. The temperature and pressure reducing valve comprises a main flowing pipe, a temperature and pressure reducing cavity, an inner sealing face, an outer sealing face and a pressure control spring, a temperature and pressure reducing water inlet is formed in the upper portion of the main flowing pipe, the temperature and pressure reducing cavity is installed in the main flowing pipe, the temperature and pressure reducing water inlet is communicated with the temperature and pressure reducing cavity, and the inner sealing face is arranged on the inner wall of the main flowing pipe. An inner sealing face is arranged on the outer wall of the temperature and pressure reduction cavity, an outer sealing face is arranged on the outer wall of the temperature and pressure reduction cavity and makes contact with the inner sealing face in a matched mode, a plurality of runners are arranged at the tail end of the temperature and pressure reduction cavity, the pressure control spring is installed between the outer wall of the tail end of the temperature and pressure reduction cavity and the inner wall of the flowing main pipe, and the initial state of the pressure control spring is a compressed state. The device is mainly used for reducing temperature and pressure.

The water vapor cooling device, the compression equipment and the cooling method are used for a water vapor compressor, a water vapor exhaust pipeline is arranged at an outlet of the water vapor compressor, the water vapor cooling device comprises a cooling medium supply assembly and a cooling assembly, and the cooling medium supply assembly is used for providing a cooling medium; the cooling assembly is connected with the water vapor exhaust pipeline and comprises a liquid storage cavity, multiple spray pipes and an adjusting mechanism, the cooling medium supply assembly communicates with the liquid storage cavity, the multiple spray pipes are arranged at intervals, each spray pipe communicates with the liquid storage cavity, and each spray pipe is provided with a nozzle; the adjusting mechanism is arranged in the liquid storage cavity, and the adjusting mechanism is configured to be switched among different working positions according to the flow of the cooling medium so as to selectively communicate the liquid storage cavity with one or more of the spray pipes. The water vapor cooling device is simple in structure, the spraying amount can be adjusted only by changing the flow of cooling water, cooperation of other variables is not needed, and the response speed can be increased.

The utility model relates to the technical field of petroleum processing, in particular to a heat source utilization device for an aromatic hydrocarbon extraction process, which comprises a medium-pressure superheated steam generating device, a steam exhaust port of the diesel oil hydrogenation steam turbine is communicated with an inlet end of the desuperheater; and the outlet end of the desuperheater and the outlet end of the temperature and pressure reducer are connected in parallel and then are respectively communicated with the steam inlet of the stripping tower reboiler, the steam inlet of the recovery tower reboiler, the steam inlet of the regeneration tower reboiler, the steam inlet of the benzene tower feeding heater and the steam inlet of the toluene tower reboiler. According to the utility model, surplus low-pressure superheated steam discharged by the diesel hydrogenation steam turbine is used as a heat carrier of the stripping tower reboiler, the recovery tower reboiler, the regeneration tower reboiler, the benzene tower feeding heater and the toluene tower reboiler, so that the use amount of medium-pressure superheated steam is reduced, and the recycling of the surplus low-pressure superheated steam is realized.

The application discloses a full-hydrophobic baffle temperature-regulating subcritical low-calorific-value coal gas-fired boiler, the lower part of the water-cooled wall is a low-calorific-value coal gas combustion zone, the upper part is a variable cross-section heating surface arrangement zone, low-temperature superheaters and low-temperature reheaters are arranged in the front and rear flues of the wall respectively, and flue gas baffles are arranged at the outlets of the two to regulate the temperature. The lower part of the wall is sequentially connected with a high-temperature economizer, a denitration device and a low-temperature economizer for hierarchical arrangement. The heating surfaces such as the low-temperature superheater and the screen-type superheater are horizontally arranged. The application utilizes the baffle temperature regulation to improve the heat transfer efficiency and fuel utilization rate; the hierarchical economizers guarantee the full-load denitration of the boiler and meet the requirement of the flue gas temperature; and the horizontally arranged heating surfaces realize full hydrophobicity, effectively preventing the accumulation of oxide scales.

NUCLEAR STEAM SUPPLY SYSTEM AND METHOD This disclosure relates to a nuclear steam supply system, comprising: a nuclear power plant, a heat source circuit, a working fluid circuit, a steam consumer, and a steam heat accumulator, where the nuclear power plant is connected to the heat source circuit, the working fluid circuit is connected to the steam consumer and the steam heat accumulator, the steam heat accumulator is connected to the steam consumer, and the heat source circuit and the working fluid circuit are independent of each other. This disclosure allows for peak levelling load adjustment of the nuclear power plant and steam load adjustment of the steam consumer, while ensuring the operational safety of an electrical grid and a reactor. Summary figure: Fig. 1

This utility model discloses a brewery heating system with molten salt energy storage, including a water source heat pump module. The water source heat pump module comprises a first working fluid-water heat exchanger, an expander, a second working fluid-water heat exchanger, a compressor, a water storage tank, a second water pump, and a third water pump. The water source heat pump module is used to convert the low-quality heat from waste hot water generated in the brewery's process into high-quality heat. This utility model addresses the current situation of energy waste and steam demand in breweries by utilizing a water source heat pump module, a molten salt energy storage module, and a steam generation module. It can be designed to take advantage of the availability of off-peak electricity and renewable energy sources, and is equipped with a molten salt electric heater to fully utilize off-peak electricity or renewable energy, reducing steam costs in the industrial park. The heat pump system can recover heat from the waste hot water, improving energy efficiency.

The invention discloses a safety protection type steam temperature and pressure reduction device and an operation method thereof. The front safety buffer unit comprises a steam inlet pipeline, a storage tank connected to the steam inlet pipeline, a main path regulating valve arranged on an outlet main pipeline of the storage tank, and a first pressure sensor used for monitoring the pressure in the storage tank; the heat recovery pressure reduction unit is connected to the downstream of the front safety buffer unit; the spray final cooling unit is connected to the downstream of the heat recovery pressure reduction unit; an intelligent control unit; the invention relates to the technical field of temperature and pressure reduction devices. According to the safety protection type steam temperature and pressure reduction device and the operation method thereof, the problems that equipment is prone to damage due to the fact that a traditional device lacks front buffering capacity when facing high-pressure impact, energy waste or unstable working conditions are caused due to inaccurate control of the cooling process, and the overall energy utilization efficiency of a system is low are solved.

The utility model relates to the technical field of heat exchange and temperature reduction devices, and discloses a dry quenching steam efficient heat exchange and temperature reduction device for a methanol conversion procedure, which comprises a spray pipe, a connecting cover is welded at the top of the spray pipe, a bolt is arranged at the top of the connecting cover, and one end of the inner wall of the bolt is in threaded connection with a threaded rod. The output end of the bottom of the threaded rod extends to one end of the inner wall of the connecting cover, the bottom of the threaded rod is fixedly connected with a pressing piece, the bottom of the pressing piece is fixedly connected with a spring, the output end of the bottom of the spring is fixedly connected with a piston piece, and the outer side wall of the piston piece is in sliding fit with the inner wall of the spray pipe. The flow of the desuperheating water is accurately controlled, then the steam temperature is accurately adjusted, the unique threaded rod and piston piece linkage structure can flexibly change the flow area of the narrow channel, the nozzle is matched for atomizing the desuperheating water, the heat exchange efficiency is improved, the stable operation of the methanol conversion procedure is guaranteed, the energy consumption and the maintenance cost are reduced, and the device is more practical.

The application provides a control system and method for medium-pressure steam admission in a gas-steam combined cycle unit, comprising a medium-pressure water extraction pump, a superheater, a medium-pressure bypass regulating valve, a condenser, a medium-pressure steam regulating valve, a reheater and a steam turbine, the medium-pressure water extraction pump is connected with the superheater through a pipeline, the water outlet of the superheater is connected with the condenser and the medium-pressure cylinder of the steam turbine through pipelines, the medium-pressure bypass regulating valve is arranged on the pipeline corresponding to the condenser, the medium-pressure steam regulating valve is arranged on the pipeline corresponding to the steam turbine, and the reheater is arranged between the medium-pressure steam regulating valve and the steam turbine. The control system and method for medium-pressure steam admission in the gas-steam combined cycle unit can maintain the medium-pressure drum liquid level in a safe liquid level range through the medium-pressure feedwater regulating valve, realize automatic control during medium-pressure steam admission through the opening and closing of the medium-pressure steam regulating valve and the medium-pressure bypass regulating valve, and reduce misoperation.

The invention discloses a coal-fired power plant boiler with a temperature adjusting structure, the coal-fired power plant boiler is a T-shaped boiler, convection vertical shafts are arranged on the two sides of the T-shaped boiler respectively, the convection vertical shafts are connected with a hearth through horizontal flues, two tail flues are arranged in each convection vertical shaft in parallel, and the tail flues are connected with the T-shaped boiler. A low-temperature reheater is arranged at the position, close to the hearth, of the tail flue, a low-temperature superheater is arranged at the position, away from the hearth, of the tail flue, and an adjustable flue baffle is arranged at the tail end of each flue. The invention further discloses a temperature regulation control method and system thereof, a boiler flue digital twinborn model is constructed for training to obtain an intelligent agent, boiler real-time state parameters are collected, a reward function is set for training a strategy network, and control actions are output based on the strategy network. The problems that the T-shaped furnace is small in temperature adjustment amplitude, adjustment lags behind and the response rate is low are solved, and quick response and stability of the temperature are achieved.

The atomization desuperheater comprises a steam inlet pipeline and a venturi mixing section, the steam inlet pipeline is communicated with the inlet end of the venturi mixing section, the venturi mixing section is sequentially provided with atomization nozzles and a water drop breaking unit in the steam flowing direction, and at least two sets of atomization nozzles are arranged along the axis of the venturi mixing section. According to the atomization desuperheater, the atomization assemblies are of a multi-stage structure and are arranged in the contraction part at intervals in the steam flowing direction, when water mist is sprayed into the mixing section, the water mist sprayed out of the multi-stage atomization assemblies can prevent mixing dead angles from being generated in the desuperheater, and the uniformity of the steam temperature is improved.

A nozzle for use with a desuperheater and a desuperheater including such a nozzle. According to an example, a nozzle for a desuperheater includes a body having a first end portion, a second end portion, and a passage arranged for attachment to a flow path, extending between the first and second end portions and defining an inlet port. The passage is adapted to connect to a fluid source. The body includes an outer portion having an irregular external shape and a nozzle having an exit opening defined by the outer portion. The flow passage is coupled between the inlet port and the nozzle.

This invention pertains to a thermal standby device for a superheated steam desuperheating and depressurization system, within the technical field of superheated steam desuperheating and depressurization systems. The equipment pipeline (23) is sequentially configured from one end connected to the high-pressure main steam input pipeline (24) to the other end of the heating pipe, including a high-pressure steam inlet isolation electric valve, a high-pressure steam depressurization regulating valve (3), a high-temperature high-pressure desuperheating and depressurization device (6), a medium-pressure steam depressurization regulating valve (8), a medium-temperature medium-pressure desuperheating and depressurization device (10), a heating pipe isolation electric valve, and the heating pipe itself. The thermal standby device for a superheated steam desuperheating and depressurization system described in this invention has a simple structure, ensures it remains in thermal standby mode, reduces the time required for emergency deployment, and minimizes energy loss while maintaining thermal standby, thus meeting heating demands.

The invention discloses an overheating attemperation water control method and system with autonomous decision-making and flexible control functions, and belongs to the field of intelligent control of gas-steam combined cycle units. Comprising a first constant module, a first smaller module, a first subtraction module, a second constant module, a first larger module, a first AND module, a third constant module, a second smaller module and a first OR module. The first constant module is connected to the first smaller module; the output end of the first subtraction module and the second constant module are respectively connected to the first greater module; the first smaller module output end and the first larger module output end are respectively connected to the first AND module; the third constant module is connected to the second smaller module; the first AND module output end and the second AND module output end are respectively connected to the first OR module; and the output end of the first or module is connected to an overheat attemperation water valve forcibly-closed instruction. The requirement that the actual steam temperature is unidirectionally increased according to the preset temperature rise rate in the unit starting process is met.

The present application provides a kind of superheated water vapor generating device, make the generation of superheated water vapor large capacity, superheated water vapor generating device (100) is heated to the water vapor from the guide inlet (P1) is guided and is exported from guide outlet (P2) superheated water vapor, the superheated water vapor generating device (100) has: multiple or multiple group superheated water vapor generating part (2), water vapor is heated to generate superheated water vapor;Distribution pipe (3), the water vapor from guide inlet (P1) is distributed and imported multiple or multiple group superheated water vapor generating part (2);And convergence pipe (4), the superheated water vapor generated by multiple or multiple group superheated water vapor generating part (2) is converged and is exported from guide outlet (P2).

The invention discloses a process-oriented forward acceleration device and system controller. The device comprises a first addition link, an amplitude limiting integrator, a differentiator, a forward output controller and a second addition link, the amplitude limiting integrator comprises an integrator and an integrator amplitude limiting controller; and the integrator amplitude limiting controller is used for limiting the amplitude of the output of the integrator. The first addition link is used for adding the output signal of the integrator and the external process signal, accelerating the external process signal and outputting an acceleration signal to the differentiator. According to the method, the forward control quantity can be advanced, and the method has a good effect on restraining forward overtemperature of the overheat steam temperature control system.

Disclosed in the present invention is a steam temperature control method for a solar power tower plant. The method integrates the control of a hot molten salt transfer pump with the control of inlet hot molten salt regulating valves of a superheater and a reheater on the basis of regulating loop control characteristics, so as to effectively mitigate the effect of temperature lag. Compared with the prior art, the method provided by the present application is based on an independent decoupled operating mode for superheated steam and reheated steam temperature regulating loops, so as to effectively meet the power change requirements of turbo-generator units. In addition, the operation of a hot salt pump flow regulating loop is adjusted on the basis of the operating states and variation trends of the superheated steam and reheated steam temperature regulating loops. To organically coordinate the interrelation, a control method based on a regulating valve position and control loop deviation characteristics is provided. The characteristics of a regulating valve position relationship within the superheated steam and reheated steam temperature regulating loops, along with the deviation states and trend information of the regulating loops, are introduced into a unified valve position integrator and a unified monitor, and by means of the unified valve position integrator and the unified monitor, monitoring and determination are performed, so as to adjust the operation of the hot salt pump flow regulating loop in real time.

Presented are processes for the beneficial conversion of CO2 and other environmentally destructive compounds to their constituent parts by the application of thermal plasma containing activated species whereby the interaction of the plasma with the compounds and reactions of CO2 and H2 generate more environmentally friendly compounds comprising in part oxygen and hydrogen. The thermal plasma may be vibro-shear plasma generated by the superheating of either steam, gas or a combination of both.

The utility model discloses a waste incineration waste heat boiler desuperheating water position adjusting device, and relates to the technical field of waste incineration waste heat boiler desuperheating water position adjusting. A gate valve and a tee joint are connected into a superheater connecting pipe for connecting a low-temperature superheater I, a medium-temperature superheater I and a medium-temperature superheater II. The flow direction of steam in the pipeline is adjusted through opening and closing of the gate valve, so that the access position of the attemperation water is adjusted, and the position of the attemperation water is adjusted from the original position between the low-temperature superheater I and the medium-temperature superheater I to the position between the medium-temperature superheater I and the medium-temperature superheater II. After the steam superheat device is adopted, the steam superheat degree of the outlet of the medium-temperature superheater I is improved compared with that of the outlet of the low-temperature superheater I, and the problem that the steam superheat degree is not enough when the desuperheating water amount at the outlet position of the low-temperature superheater I is too large is effectively solved. And meanwhile, the medium-temperature superheater I is reduced behind the desuperheater, and the steam is not easy to overheat at the outlet of the medium-temperature superheater II, so that the adjusting efficiency of the boiler is improved, and the safe operation of the boiler is guaranteed.

This invention relates to the field of boiler technology and discloses an automatic adjustment system for boiler desuperheating water flow rate, used in a boiler including a superheater, a reheater, and a feedwater pump. The system includes a main desuperheating system, a secondary desuperheating system, and a control device. The main desuperheating system controls the steam temperature at the superheater outlet, and the secondary desuperheating system controls the steam temperature at the reheater outlet. The main and secondary desuperheating systems are connected in parallel to the feedwater pump. The automatic adjustment system for boiler desuperheating water flow rate disclosed in this invention can automatically adjust the boiler desuperheating water flow rate according to the steam temperature in the boiler superheater to ensure the normal operation of the boiler.

The invention relates to the technical field of automation control, in particular to a control method, device, equipment and medium of a steam regenerative coupling heat supply system.The method comprises the steps that a first target pressure value of a heat supply main pipe and a second target pressure value of a steam main pipe are obtained; the first target pressure value and a first feedback pressure value of the heat supply mother pipe are input into a first controller, and the first controller outputs a first control quantity based on a corresponding target parameter; the first control quantity, the second target pressure value and a second feedback pressure value of the steam main pipe are input into a second controller, and the second controller outputs a second control quantity based on a corresponding target parameter; and controlling the steam pressure regulating valve according to the second control quantity. According to the method, cooperative stabilization of the pressure of the steam mother pipe and the heat supply mother pipe can be achieved, mutual influence of the pressure of the steam side and the heat supply side in the steam regenerative coupling system is avoided, and safe and stable operation of the induced draft fan is guaranteed.

The present invention provides a steam flow control device, a power plant, a steam flow control method, and a steam flow control program that enable load reduction while maintaining dry operation. [Solution] The steam flow control device 50 is a steam flow control device 50 for a power plant that includes a bypass line for bypassing steam passing through the heat recovery section of a boiler and a bypass valve for adjusting the steam flow rate, and comprises an acquisition unit 51 for acquiring the required power generation amount of the power plant, a calculation unit 52 for calculating the corresponding steam flow rate and bypass valve opening degree, which is the opening degree of the bypass valve, based on the acquired required power generation amount, and an adjustment unit 53 for adjusting the opening degree of the bypass valve so that it corresponds to the calculated steam flow rate.

The invention belongs to the technical field of boilers, and provides a superheating corner tube steam boiler and an operation method thereof. The superheating corner tube steam boiler comprises a boiler body, a boiler barrel, a superheater, an air preheater, an energy saver and a condenser; a water pipe system is arranged on the heating surface of the hearth and the flue gas channel, the water pipe system comprises a slag solidification pipe set and a convection pipe set, the flue gas channel comprises a first channel, a side flow channel and a second channel which are arranged in the flue gas flowing direction, and the slag solidification pipe set, a second superheater, a first superheater and the convection pipe set are sequentially arranged in the second channel in the flue gas flowing direction; the first superheater and the second superheater form a two-way steam system working synchronously, the first superheater comprises two stages of superheating structures, a first desuperheater is arranged between the two stages of superheating structures, and a second desuperheater is arranged at an outlet of the second superheater. The device can stably operate under the condition of low-calorific-value gas calorific value fluctuation, double-path steam is synchronously output, and load change of a steel production line is flexibly adapted.

The present disclosure provides a mixed steam device based on a boiler and a molten salt heat storage and a regulation method thereof. The mixed steam device comprises a boiler system and a molten salt heat storage steam generation system. The first steam generated by the molten salt heat storage steam generation system is mixed with the second steam generated by the boiler system to output mixed steam. The regulation method comprises: obtaining a mixed steam pressure value of the mixed steam; using a gradient adjustment strategy to determine the numerical interval of the mixed steam pressure value, and regulating the molten salt heat storage steam generation system and the boiler system. The first steam flow corresponding to the first steam satisfies a first steam use load, and the mixed steam flow corresponding to the mixed steam satisfies a second steam use load. The present disclosure realizes automatic, efficient and intelligent regulation of the molten salt heat storage steam generation system and the boiler system, meets the use requirements of users, and makes the proportion of the first steam flow output by the molten salt heat storage steam generation system meet the design value.

The application provides a kind of π type boiler with low temperature heating surface arranged in furnace and flue gas recirculation, and belongs to the field of π type boiler.The outlet of horizontal flue is connected to the tail flue of the boiler, and the tail flue is divided into front tail flue and rear tail flue, low temperature superheater and economizer are arranged in the front tail flue, low temperature reheater and economizer are arranged in the rear tail flue, and flue gas temperature control baffle is installed in the front and rear flue at the outlet of the tail flue;The left and right sides of the boiler bottom hearth are connected to the flue gas recirculation fan through the connecting flue.The application adopts a variety of coupled optimization temperature control mode.Coupled optimization temperature control mode is the comprehensive use of the above several temperature control modes, two or more temperature control modes are used during the operation of the boiler, and the steam temperature is adjusted at the same time.Compared with the use of single temperature control mode, the coupled optimization mode can provide larger temperature control range and more accurate temperature control.

The application discloses a kind of overheat steam temperature control systems of no water injection post-steam temperature measurement signal, first controller carries out comprehensive operation to overheat steam temperature measurement value and overheat steam temperature set value and forms overheat temperature reducing water flow demand signal, second controller carries out comprehensive operation to overheat temperature reducing water flow demand signal and temperature reducing water flow measurement value and forms temperature reducing water regulating door opening degree instruction, and MA hand / automatic operation station is controlled temperature reducing water regulating door opening degree, realizes overheat temperature reducing water flow and overheat steam temperature closed-loop control;Using temperature reducing water flow closed-loop control, can accurately control overheat temperature reducing water flow, effectively overcome the non-linear defect of overheat temperature reducing water regulating door valve opening degree-flow, improve the comprehensive regulation quality of overheat steam temperature;And since no water injection post-steam temperature measurement signal that is difficult to accurately reflect temperature reducing water flow change is used, the regulation quality of conventional cascade overheat steam temperature control system is also avoided and the problem that overheat steam temperature automatic control is difficult to realize.