361results 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 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 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 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.

The invention discloses a Venturi type steam rotational flow atomization desuperheater and a regulation and control system, and belongs to the technical field of steam temperature and pressure reduction. The problems that in an existing desuperheater, desuperheating water makes direct contact with a high-temperature barrel, the local temperature difference of the barrel is obviously increased, and cracks or deformation is likely to be generated due to thermal stress in long-term operation are solved. A venturi structure is applied to the desuperheater, a steam inlet pipeline, an inlet conical pipe section, a venturi throat pipe section, an outlet conical pipe section and an outlet pipeline are arranged in the desuperheater, and steam sequentially passes through the structure. And a sawtooth rotational flow channel is arranged on the inner wall of the venturi throat pipe section. The conical pipe section is provided with water spraying holes, the sleeve is fixed outside the throat pipe section, and desuperheating water enters the steam flow channel through the sleeve and the water spraying holes. And the regulation and control system realizes automatic regulation of the flow of desuperheating water. The desuperheating water is uniformly atomized under the impact action of the rotational flow steam, and liquid drops rapidly absorb heat and are evaporated into low-temperature steam, so that a proper desuperheating and decompressing effect is achieved, and the direct contact between the desuperheating water and the high-temperature cylinder is effectively reduced.

The invention discloses a turbine-boiler coupling flexible heat regeneration method for deep peak regulation, and relates to the technical field of thermal power plant unit steam deep peak regulation. Comprising the steps that boiler fuel supply and combustion intensity are reduced, and a unit enters a low-load operation state; extracting part of high-temperature and high-pressure steam from a main steam pipeline in front of a steam turbine as a heat source; the pressure of the extracted high-temperature and high-pressure steam is reduced through a temperature and pressure reducing device, and water is sprayed for cooling; steam is introduced into the heat exchanger to release heat, primary air and secondary air are heated, and air needed by combustion is preheated through steam waste heat; the steam subjected to air heating exchanges heat with feed water through a first high-pressure heater; the amount of high-temperature and high-pressure steam extracted from a main steam pipeline in front of a steam turbine is adjusted, the load and the system efficiency are balanced, the steam distribution proportion and parameter setting are optimized, and deep peak regulation is achieved. Steam waste heat is comprehensively utilized to increase the air temperature, energy waste during peak regulation is reduced, and the overall efficiency of the system is improved.

The invention provides a superheated steam temperature control method and system for a secondary reheating unit, and belongs to the field of thermotechnical automation, and the method comprises the following steps: obtaining a leading zone superheated steam temperature and an inert zone superheated steam temperature of a three-stage superheater of the secondary reheating unit; the cascade control system of the secondary reheating unit comprising a main loop and an auxiliary loop is designed, a stepped predictive controller SGPC is adopted as a main loop controller of the cascade control system, the stepped predictive controller SGPC is adopted as the main loop controller of the cascade control system, control parameters of the main loop are adjusted through the main loop controller, and the control parameters of the auxiliary loop are adjusted through the auxiliary loop controller. The problems of large delay and large inertia of the system can be solved; by adopting the ADRC as the auxiliary loop controller of the cascade control system and adjusting the control parameters of the auxiliary loop, the secondary disturbance in the auxiliary loop can be inhibited, and the influence of the secondary disturbance on the control of the superheated steam temperature is reduced, so that the superheated steam temperature is controlled within a set range.

The invention relates to the technical field of energy utilization and energy storage, and discloses a steam generation system and a pressure cascade early warning regulation and control method thereof, and the system comprises a heat pump device, a water storage device, an energy storage device and a desuperheater; a water feeding pump set and a mother pipe adjusting valve set are arranged on a main water inlet pipeline connecting the energy storage device and the water storage device, and the mother pipe adjusting valve set is used for conducting PID adjustment on the flow of high-temperature water according to pressure data collected by pressure monitoring points arranged in a system pipeline so as to keep the pressure of a steam pipeline stable. A desuperheating water adjusting valve is arranged on a desuperheating water pipeline connecting the water storage device and the desuperheater, and the desuperheating water adjusting valve is used for conducting PID adjustment on the flow of desuperheating water according to temperature data collected by a temperature monitoring point arranged in a system pipeline so as to keep the steam temperature stable. According to the method, adjustment is conducted in the system generation process by combining system water supply amount adjustment and circulation pipeline design, energy is more effectively utilized, and system safety is protected.

The invention provides a peak regulation power generation system and method coupling fused salt heat storage and steam supplementing of a steam turbine, and relates to the technical field of heat energy engineering.The system comprises a fused salt heat storage and heat exchange system comprising a low-temperature fused salt tank, a fused salt heater, a high-temperature fused salt tank and a fused salt steam-water heat exchanger; comprising a gas-fired boiler, a steam turbine and a water supply system; the fused salt heater is used for receiving low-temperature fused salt fed by the low-temperature fused salt tank through the low-temperature fused salt pump in the electricity utilization trough period and heating the low-temperature fused salt through heat provided by the gas-fired boiler. The fused salt steam-water heat exchanger is used for receiving high-temperature fused salt fed by the high-temperature fused salt tank through the high-temperature fused salt pump during the peak period of electricity consumption and transferring heat energy of the high-temperature fused salt to high-pressure feed water from the water supply system to generate superheated steam; and one part of the superheated steam is fed into a main steam main pipe connected with the gas-fired boiler. The power generation efficiency of the steam turbine can be effectively improved, and efficient utilization of heat energy and flexible adjustment of power grid loads are achieved.

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 embodiment of the invention provides a wide-load multi-stage steam supply system and an operation method thereof. The wide-load multi-stage steam supply system comprises a steam turbine power generation assembly and a heat supply assembly. The steam turbine power generation assembly comprises a main steam pipeline, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder and a power generator. The heat supply assembly comprises a reheat steam pipeline, a steam supply mother pipeline, a steam supplementing pipeline, a medium-pressure cylinder steam exhaust pipeline and a heat supply network heater. The steam supply mother pipeline is connected with a reheat steam pipeline and an industrial steam supply device; a steam exhaust pipeline of the medium-pressure cylinder is respectively connected with a medium-low pressure communicating pipe and a heating network heater, and the heating network heater is connected with a resident heating device; the steam supplementing pipeline is respectively connected with the steam supply mother pipeline and the heat supply network heater; the steam supplementing pipeline conveys industrial supplied steam of the steam supplying main pipeline to the heat supply network heater for steam supplementing when the unit operates at low load. And meanwhile, the power grid peak regulation requirement and the heat consumer requirement are met, the resident heating and industrial steam supply requirements are considered while the unit peak regulation capacity is not affected in the heating season, and the thermal power unit peak regulation capacity can be released to the maximum extent.

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 present invention relates to a desuperheating water system for superheaters and reheaters of a new type of million-ton tower boiler. At present, in order to ensure the wall temperature safety of the reheater system, the desuperheating water of the reheater is often put into use, and the input of the desuperheating water of the reheater will reduce the efficiency of the boiler, thus ultimately affecting the coal consumption of the unit and increasing the operation cost of the power plant. A desuperheating water system for superheaters and reheaters of a new type of million-ton tower boiler includes: a feed water pump (1), the feed water pump is connected to a group of high-temperature heaters (2), the group of high-temperature heaters are connected in series on the pipeline of the feed water pump, the group of high-temperature heaters are connected to the boiler feed water system, a superheater desuperheating water main pipe (3) is connected between the boiler feed water system and the group of high-temperature heaters, and the superheater desuperheating water main pipe is connected to a primary desuperheating water branch (11) and a secondary desuperheating water branch (12). The present invention is applied to the field of boilers.

The utility model provides a waste heat boiler with deoxidization, dust removal and denitration functions. The waste heat boiler comprises a dust removal device, a denitration device, a boiler body, a deaerator, a connecting structure, a heat pipe heat exchanger and a water-water heat exchanger. The dust removal device is arranged at the smoke inlet end of the boiler body, and the heat pipe exchanger is detachably connected with the smoke outlet end of the boiler body through a connecting structure. A water side inlet of the heat pipe exchanger is provided with a water feeding pump, a water side outlet of the heat pipe exchanger is provided with a three-way valve, one end of the three-way valve is connected with an inlet of the water-water heat exchanger, and the other end of the three-way valve is connected with an economizer of the boiler body. According to the waste heat boiler with the oxygen removal, dust removal and denitration functions, the problems that in the related technology, a waste heat boiler only comprises a boiler body heating surface and is difficult to adapt to various industrial waste gas working conditions, so that the boiler heating surface is prone to being severely clogged, and the tail heating surface is prone to being severely corroded at low temperature are solved.

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

The present invention discloses a steam heating network operation regulation system and method based on the condensation coefficient, which belongs to the field of steam heating. The present invention calculates the corresponding steam heating network condensation coefficient η based on the historical operation data of the steam heating network, and uses the minimum value of the condensation coefficient during safe operation as the threshold value η of the steam heating network condensation coefficient. min Calculate the condensation coefficient value η under actual operating conditions and compare η with η min The difference between the two values is used to calculate the water spray cooling amount for the steam heating network, achieving primary adjustment of the cooling amount. Based on actual pipe loss feedback, the cooling water adjustment amount is compared with the corresponding pipe loss change, enabling secondary adjustment of the cooling water amount. This invention simultaneously considers the water hammer risk caused by steam condensation in the heating network and the pipe loss changes caused by water spray cooling. Based on the calculated results, the water hammer risk in the steam heating network during water spray cooling can be controlled within a safe range while maintaining a high level of overall heating economic efficiency.

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 invention relates to the technical field of automatic control, in particular to a temperature control device and method for boiler superheated steam, and the method comprises the steps that a first control device comprises a first actuator, a first controller and a temperature collection module, so that a first-stage control loop is formed; the second control device comprises a second actuator, a second controller and a feedforward controller to form a second-stage control loop, the first-stage control loop is used for collecting the actual temperature of a middle point in the boiler in real time and adjusting the actual temperature of the middle point to the preset temperature of the middle point, and the second-stage control loop is used for controlling the boiler to work based on the preset temperature of the middle point. And the actual temperature of the superheated steam in the boiler is adjusted to the preset temperature of the superheated steam. Therefore, the problems that in the related technology, the control precision is low, the execution speed is low, the flexibility and expansibility of the system are limited, and different working conditions and requirements cannot be met are solved.

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.

The present invention discloses a control method for preventing oxide scale shedding from the heating surface during peak-shaving startup and shutdown of a coal-fired unit. By controlling the rate of change of steam temperature and pressure during startup and shutdown, sudden changes in steam and wall temperatures are prevented. The method also adjusts the opening of the boiler's additional air and fuel air dampers to control the flue gas temperature at the furnace outlet and prevent overheating and dry burning of the heating surface. The method also adjusts the opening of the high-pressure bypass to control the steam flow rate on the heating surface and prevent sudden changes in superheated steam temperature. During turbine run-up and generator grid connection, the method adjusts the reheat flue gas damper to prevent a sudden rise in reheated steam temperature. During shutdown, the method controls the superheat after the desuperheater to prevent water plugging in the superheater. Thus, without upgrading or renovating the heating surface materials, and only by optimizing the operation control method, it is possible to achieve a state where oxide scale is not detected on the heating surface throttle orifices and the bottom of the U-bend within a single maintenance cycle, and tube bursts are avoided.

The invention discloses a low-heating-value gas boiler heat exchange system which comprises a horizontal flue and a vertical flue, a high-temperature reheater and a low-temperature reheater are arranged in the horizontal flue, and an upper-stage air preheater and a lower-stage air preheater are arranged in the vertical flue. A left side connecting flue and a right side connecting flue are arranged on the left side and the right side of the middle position of the upper-stage air pre-heater and the lower-stage air pre-heater, a bypass flue is connected between the left side connecting flue and the right side connecting flue and provided with a steam flue gas heat exchanger, and the bypass flue is connected with the two ends of the flue gas heat exchange side of the steam flue gas heat exchanger. The two ends of the steam heat exchange side of the steam flue gas heat exchanger communicate with a steam bypass, and the steam bypass communicates with an outlet of the low-temperature reheater and an inlet of the high-temperature reheater. The smoke temperature of the lower-stage air pre-heater is increased, the condensation possibility of ammonium hydrogen sulfate is reduced, the corrosion risk of the ammonium hydrogen sulfate to the heating surface of the lower-stage air pre-heater is reduced, and the service life of equipment is remarkably prolonged; and the overtemperature risk of the reheater is reduced, and the flexibility of reheating steam temperature adjustment is improved.

The invention discloses an adjustable spraying device for a temperature reducing device and a cooling method, the adjustable spraying device comprises a steam circulating pipe, a cooling water conveying pipe and a spraying device, the liquid outlet end of the cooling water conveying pipe extends into the steam circulating pipe, and the spraying device is connected to the liquid outlet end of the cooling water conveying pipe in a sleeving mode; the spraying device comprises an annular nozzle, a drainage cap and a stroke cylinder, the annular nozzle is fixedly arranged on the inner wall of the liquid outlet end of the cooling water conveying pipe in a sleeving mode, an annular water pressure bin is formed between the waist of the drainage cap and the inner wall of the annular nozzle, and the drainage cap is coaxially and movably matched with the spraying end of the annular nozzle; an annular spraying gap is formed between the drainage cap and the inner ring of the spraying end of the annular nozzle, one end of the stroke cylinder movably sleeves the outer side of a guide cylinder coaxially and integrally connected with the side, away from the spraying end, of the annular nozzle, and the drainage cap is synchronously connected with the stroke cylinder through a center rod. Hot steam in the steam circulating pipe can be rapidly cooled, and the jet flow of the annular nozzle can be adjusted according to the optimal temperature needed by the production working condition.