48results about "Water circulation" patented technology

The invention provides a water supply control method, system and device of a supercritical generator set and a program product. The method comprises the steps of obtaining set starting data; responding to the condition that the unit starting data meets the starting stage switching condition, and switching the current starting stage to the next starting stage; an opening degree calculation function, matched with the current starting stage, of the water supply bypass adjusting valve is obtained, and the target opening degree of the water supply bypass adjusting valve is obtained through calculation according to the opening degree calculation function and the boiler combustion rate; and the opening degree of a water supply bypass adjusting valve is controlled to be the target opening degree, and the start-stop state of a water supply main path water inlet valve is controlled according to the current start stage. By dividing the unit starting stages and establishing the dynamic coupling relation between the boiler combustion rate and the water supply bypass regulating valve opening degree, accurate matching of the fuel amount and the water supply amount is achieved, the water supply bypass regulating valve opening degree can be automatically adjusted according to the real-time operation working condition of the unit, the starting time is shortened, the starting cost is reduced, and the starting efficiency is improved. And meanwhile, the automation and intelligence level is improved.

To provide a boiler low temperature state quick flushing method.SOLUTION: A boiler flushing device includes: an activation mechanism comprising a boiler body and a power assembly provided at the boiler body; a scale removal mechanism comprising a transmission assembly provided at the power assembly and a scale scraping assembly provided at the transmission assembly; and a uniform stirring mechanism comprising a fixed column provided at the boiler body, a limiting assembly provided at the fixed column, and a motion assembly provided at the limiting assembly. The scale removal mechanism allows a scale scraping brush to perform circular motion on an inner wall of the boiler body to scrape scales on the inner wall of the boiler body. A scraping member is provided on the inner wall of the boiler body and cleans the scale scraping brush. At the same time, the uniform stirring mechanism is provided on the fixed column to avoid the scraped scales from accumulating on a bottom part of the boiler body and being discharged from the boiler body with water flow through a drain pipe and allow cleaning to be performed more thoroughly.SELECTED DRAWING: Figure 2

The invention belongs to the technical field of thermal power generation, and particularly relates to a feed pump recirculation system for preventing cavitation of a minimum flow valve of a thermal power generating unit. The feed pump recirculation system comprises a condenser, a condensate pump, a low-pressure heat regenerator set, a deaerator, a feed pump and a high-pressure heat regenerator set which are sequentially connected, each stage of extraction steam of an external steam turbine is connected with steam inlets of the high-pressure heat regenerator set, the deaerator and the low-pressure heat regenerator set, and a condensate outlet of the high-pressure heat regenerator set is connected with a condensate inlet of the deaerator. A condensed water outlet of the low-pressure heat regenerator set is connected with a condensed water inlet of the condenser, the water feeding pump sequentially passes through the minimum flow valve, the heat exchanger and the first stop valve and is connected with the deaerator, and external cooling water enters the heat exchanger through the third stop valve for heat exchange and then is discharged. The return water temperature of the feed pump recirculation system is reduced through the heat exchanger, the saturated steam pressure corresponding to the return water is reduced, the cavitation risk of the minimum flow valve is reduced, and the service condition of the minimum flow valve can be obviously improved.

The application discloses a water supply device and a mixed speed regulation control method and device thereof and a storage medium, wherein the water supply device comprises a boiler, a high-pressure heater and a first water supply device and at least one second water supply device connected in parallel, the first water supply device comprises a first water supply pump and a hydraulic coupler, the second water supply device comprises a second water supply pump and a variable frequency motor, the method comprises the following steps: adjusting the rotating speed of the first water supply pump by configuring the scoop pipe opening degree of the hydraulic coupler, and adjusting the rotating speed of the second water supply pump by configuring the operating frequency of the variable frequency motor; heating the pumped water through the high-pressure heater, and conducting convection on the hot water output by the high-pressure heater through the boiler to output superheated steam; acquiring the drum water level of the boiler; determining the target rotating speed according to the drum water level, and determining the scoop pipe opening degree instruction and the variable frequency instruction according to the target rotating speed to control the scoop pipe opening degree of the hydraulic coupler and the operating frequency of the variable frequency motor, so that the drum water level is in a preset water level interval.

The present application relates to a method for reducing the start-up time of a water-cooled wall standby furnace, which uses equipment including a gasifier water-cooled wall, a steam drum and a water-cooled wall circulating water pump. The present application makes full use of the heat of the continuous blowdown of the operating series steam drum, and realizes the maintenance of the standby series water-cooled wall temperature, and the system is simple and the control is convenient; compared with the prior art, the present application can reduce the start-up time of the standby furnace, reduce the impact of the gasifier trip on the device operation load, and reduce the economic loss caused by shutdown. According to the water baking time of 8 hours, the present application can reduce the economic loss of 8 hours caused by unplanned shutdown, and according to the gasification scale of 100,000 standard cubic meters / hour of effective gas production, the economic loss can be reduced by nearly 500,000 yuan.

The present application relates to a kind of thermal power generating unit control technical field, is a kind of thermal power generating unit condensate pump automatic control system energy-saving optimization method and device, the former includes determining by deaerator water regulating valve control condensate pump outlet header pressure, then judge deaerator water regulating valve whether full open;In response to no, reduce condensate pump outlet header pressure set value, until deaerator water regulating valve full open;In response to yes, judge current deaerator water regulating valve opening degree whether with condensate pump energy-saving operation match;In response to no, increase condensate pump outlet header pressure set value, until current deaerator water regulating valve opening degree with condensate pump energy-saving operation match.The present application is by lifting the opening degree of deaerator water regulating valve, reduce the throttling loss caused by deaerator water regulating valve opening degree low, simultaneously make the throttling loss of deaerator water regulating valve minimum and condensate pump outlet header pressure maximum, in reducing energy loss while guaranteeing the economy of condensate pump operation.

A method for retrofitting an installation of a type used for a hybrid propulsion system for LNG carriers, said method being based on the steps of retrofitting an LNG carrier boiler of the installation, retrofitting an existing exhaust gas outlet and integrating a new exhaust gas outlet, forming an opening in the combustion chamber of said LNG carrier boiler, introducing exhaust gas from a GTPG inside the formed opening and adding a second superheater inside the exhaust gas outlet between said GTPG and said LNG carrier boiler, integrating an auxiliary steam and water system and integrating an automatic changeover extraction system and connecting both systems to said hybrid propulsion installation.

The invention discloses a pump warming-up system of a natural circulation boiler, and belongs to the technical field of boiler auxiliary equipment. The pump front pipeline and the pump rear pipeline are respectively provided with a first valve and a second valve and are communicated with a downcomer and a coal economizer; the pump warming connection pipeline is provided with a third valve and is communicated with the lower part of the downcomer and an inlet of the coal economizer through a pipeline; the upstream of the second valve is communicated with the upstream of the third valve; the flow meter, the fourth valve and the adjusting valve are sequentially arranged. When the internal circulation pump is standby, the first valve is kept open, the third valve is kept closed, the fourth valve and the electric control valve are opened, the second valve is closed, and a working medium in the downcomer forms a bypass through the pump front pipeline, the internal circulation pump, the pump rear pipeline, the pump warming-up connection pipeline and the economizer recirculation pipeline and then forms a closed natural circulation loop with a boiler evaporation system. And the pump body is kept in a hot state and is consistent with the working medium in temperature during standby. The system is mainly used for keeping the internal circulation pump in a hot standby state in the natural circulation boiler and eliminating the risk of pump starting thermal shock.

The utility model relates to the technical field of boilers, and discloses a boiler with an energy-saving device, which comprises a boiler main body, an economizer, a first induced draft fan and a chimney which are sequentially connected, the output end of the economizer is connected with the first induced draft fan through the energy-saving device, a first heat exchange pipeline is arranged in the energy-saving device, and a second heat exchange pipeline is arranged in the chimney. The two ends of the first heat exchange pipeline are connected with a water tank, a first water suction pump is installed at one end of the first heat exchange pipeline, waste smoke generated by the boiler body can be sucked, the waste smoke sequentially penetrates through the economizer and the energy saver, and when the smoke passes through the energy saver, water in the water tank is sucked into the first heat exchange pipeline through the arranged first water suction pump; water in the first heat exchange pipeline absorbs heat of waste smoke in the energy saver and then is conveyed into the water tank again, heat recovery is achieved, and energy conservation and environment protection are achieved.

A water heating system having a tank and one or more heat sources for heating water is provided. The water heating system includes a water outlet for allowing egress of water from the tank and a dip tube for allowing ingress of water into the tank. The dip tube includes a first end for coupling with a water source and a second end disposed proximate a base of the tank for discharging water into the tank through an array of holes. Each of the holes is defined in a side wall of the dip tube and laterally discharges water with respect to a longitudinal axis of the second end of the dip tube.

The invention discloses a multi-loop injection feed water recycling energy recovery system and method for a nuclear power station. An outlet of a deaerator is communicated with a drainage medium inlet of a secondary ejector through an electric feed pump, an auxiliary steam input pipeline is communicated with an inlet of a primary ejector, and an outlet of the primary ejector is communicated with an inlet of the deaerator; a heat release side outlet of the high-pressure heater is divided into two paths, one path is communicated with an inlet of a second-stage ejector through an eighth valve group, the other path is communicated with an inlet of a deaerator through a drainage pump and a third valve group, an outlet of the drainage pump is communicated with the inlet of the second-stage ejector through a ninth valve group, an outlet of the second-stage ejector is communicated with the inlet of the deaerator, and an outlet of the second-stage ejector is communicated with the inlet of the deaerator. According to the system and the method, the high pressure of the recirculating fluid is used as power to eject the fluid with lower pressure, so that the pressure energy of the fluid is partially recovered, and the system and the method play an important role in energy conservation, consumption reduction and safety of the nuclear power station.

The invention relates to a system and method of controlling supply of feed water into a boiler (10). The boiler (10) comprises a feed water inlet (20) for supplying feed water into the boiler (10), a steam outlet (22) for taking steam from the boiler (10), and a liquid level sensor (14) for measuring a liquid level in the boiler (10). The steam outlet (22) comprises a steam valve (26) defining a steam valve (26) opening degree, the method comprising measuring the liquid level in the boiler (10) using the liquid level sensor (14), determining a rate of change of the steam valve (26) opening degree, and controlling the supply of feed water into the boiler (10) via the feed water inlet (20) based on the liquid level in the boiler (10), a reference liquid level for the boiler (10), and the rate of change of the steam valve (26) opening degree.

The invention relates to the technical field of starting control, in particular to a supercritical secondary reheat unit boiler-recirculation-pump-free starting control method which comprises the following steps that flow data from an economizer outlet to a water cooling wall inlet are obtained, the flow change trend is analyzed, the rotating speed of a water feeding pump and the valve position of a water feeding adjusting valve are read, and the operation state is judged; and the rotating speed execution sequence is adjusted by combining the reheater outlet steam temperature change, and linkage adjustment is conducted on the rotating speed of the water feeding pump according to the main steam pipeline outlet pressure change. According to the method, the continuous incidence relation between the flow trend, the rotating speed action, the temperature change and the pressure feedback is constructed, so that the rotating speed adjusting sequence of the water feeding pump can be dynamically adjusted along with the change of the thermal state, the water cooling wall inlet flow stability is improved, and the coordination degree of the reheat steam temperature and the main steam pressure is enhanced; the thermodynamic system in the starting stage of the unit is stable in response, the response process of the thermodynamic system in the starting stage is more coherent, and the stability and adjustment controllability of the starting process of the unit are enhanced.

The utility model discloses a boiler blow-off steam purification and recovery device, which belongs to the technical field of waste heat recovery and comprises a heat exchanger connected with a boiler, a steam condensation collector, an efficient purification component and a circulating water pump, a first one-way valve is arranged between the heat exchanger and the steam condensation collector, and a second one-way valve is arranged between the heat exchanger and the steam condensation collector. An inlet of the first one-way valve is connected with an outlet of the heat exchanger, an outlet of the first one-way valve is connected with an inlet of the steam condensation collector, the steam condensation collector is communicated with the efficient purification assembly, the efficient purification assembly is communicated with the circulating water pump, and the circulating water pump is connected with a water supplementing opening of a boiler. A pressure reducing valve is arranged between the steam condensation collector and the efficient purification assembly. By means of the structure, the problems that an existing device is difficult to utilize waste heat of water vapor in boiler blow-off and wastes water resources are solved, the energy utilization rate is increased, and green production is promoted.

This invention relates to a method, system, and storage medium for controlling the outlet valve of a low-pressure heater condensate pump. The method includes the following steps: Step S1, sending an increase opening command to the outlet valve of the low-pressure heater condensate pump; Step S2, in response to the completion of the increase opening command, acquiring the liquid level height inside the low-pressure heater; if the current liquid level height is lower than the previously acquired liquid level height, proceeding to Step S3; if the current liquid level height is higher than the previously acquired liquid level height, proceeding to Step S4; Step S3, sending a decrease operating frequency command to the low-pressure heater condensate pump; in response to the completion of the decrease operating frequency command, acquiring the liquid level height inside the low-pressure heater; if the current liquid level height reaches a preset value, proceeding to Step S1; otherwise, proceeding to Step S5. Compared with the prior art, this invention has advantages such as reducing throttling losses, improving economic efficiency, and enhancing environmental benefits.

Disclosed are a steam generating device that is exempt from inspection and an operating method thereof, wherein the steam generating device comprises: a first water pump, a condensing heat exchanger, a second water pump and a steam generating body that are connected in series in sequence; water flows through the first water pump, the condensing heat exchanger and the second water pump in sequence and enters the steam generating body; the first water pump has a water inlet end for inputting water, and the steam generating body has a steam output end for outputting steam and a smoke output end for outputting smoke; the smoke flow duct of the condensing heat exchanger is connected to the smoke output end; the lift of the first water pump is smaller than the lift of the second water pump and larger than the water resistance of the second heat exchange component.

This invention discloses a water supply device and its mixing speed control method, apparatus, and storage medium. The water supply device includes a boiler, a high-pressure heater, a deaerator, and a first water supply device and at least one second water supply device connected in parallel. The first water supply device includes a first water supply pump, a hydraulic coupler, and a first minimum flow valve. The second water supply device includes a second water supply pump, a variable frequency motor, and a second minimum flow valve. The method includes: acquiring the boiler drum water level to determine a target speed based on the boiler drum water level, and determining a scoop tube opening command and a variable frequency command based on the target speed to control the scoop tube opening of the hydraulic coupler and control the operating frequency of the variable frequency motor, thereby ensuring that the boiler drum water level is within a preset water level range; and configuring the on / off flow thresholds of the first and second minimum flow valves according to the operating frequency of the variable frequency motor, so as to accurately control the on / off flow thresholds of the minimum flow valves and thereby improve the energy efficiency of the water supply device.

The application discloses a structure for non-neutral point grounding of a full-immersion electrode boiler, which comprises an isolation room, a furnace shell, phase electrodes and zero electrodes, the furnace shell is arranged in the isolation room, the phase electrodes are arranged in the furnace shell, and the zero electrodes are arranged in the furnace shell, and the structure is characterized in that the structure further comprises a first insulating support, a second insulating support and a conductive connecting piece, the first insulating support is arranged in the furnace shell, the zero electrodes are directly or indirectly arranged on the first insulating support, the second insulating support is arranged on the furnace shell, the second insulating support is located outside the furnace shell, the second insulating support is located between the furnace shell and the ground, the zero electrodes are connected through the conductive connecting piece, the zero electrodes are connected together as a neutral point, the furnace shell is used as a zero point, insulating rings are arranged on water outlets and water inlets of the furnace shell, the insulating rings are located between an outer wall of the furnace shell and an inner wall of the isolation room, the isolation room is grounded, and the furnace shell is not grounded.

The present invention discloses an ocean thermal energy combined supply system. The system respectively sucks surface seawater and deep seawater through a water supply module. After using the surface seawater as a heat source to heat the working medium in a steam generator, the working medium vaporizes. The gaseous working medium heated by a solar collector enters an expander to do work, enabling the expander to drive a generator to generate electricity. A part of the exhausted steam of the expander is transported to an evaporator, and the evaporator absorbs heat through evaporation to achieve refrigeration and output. The remaining liquid working medium in the steam generator sequentially releases heat through a first recuperator, then mixes with the exhausted steam of the expander and releases heat after passing through a second recuperator, and then mixes with the working medium of the evaporator and releases heat after passing through a third recuperator, and then enters a condenser to condense the working medium into a saturated liquid working medium. The saturated liquid working medium then sequentially enters the third recuperator, the second recuperator, and the first recuperator to absorb heat and increase the temperature, and then re-enters the steam generator. The technical solution of the present invention can output electric energy and cooling capacity while improving the conversion efficiency of ocean thermal energy.

The invention discloses a low-load water supply three-impulse control method for a heat supply unit, which comprises the following steps of: taking a steam drum water level as a controlled variable, introducing a steam flow fitting value and water supply flow as auxiliary regulating variables, and realizing dynamic control through a PID (Proportion Integration Differentiation) regulating formula, the steam flow fitting value is calculated through a formula with a dynamic correction coefficient based on the main steam heat supply flow, the regulating stage pressure, the high bypass opening degree and the hot reheat supply flow, the problem that steam flow measurement is not accurate under the low load is solved, meanwhile, a parameter self-adaption strategy is designed according to the working conditions such as starting and stopping, and the measurement accuracy is improved. According to the method, the fluctuation amplitude of the steam drum water level under the low load can be reduced to + / -30 mm, the adjusting time is shortened to be within 30 seconds, and the stability and safety of low-load operation of a heat supply unit are remarkably improved.

A boiler blow-off, temperature reduction, noise reduction and white smoke elimination system comprises a water supplementing tank, a boiler water feeding pump and a pipe network, and is characterized in that a coil heat exchange device (2) is arranged in the water supplementing tank (1) so that heat exchange can be conducted between regularly-discharged sewage and normal-temperature water in the water supplementing tank, soft water or desalted water with a certain pressure is contained in the pipe network, and the boiler water feeding pump (3) pressurizes water in the water supplementing tank (1) and supplies heat to the water supplementing tank (1). And a sleeve type heat exchange device (5) is arranged on a steam discharge pipe (8) led to the periodic blowdown flash tank (4), so that the phenomenon that the steam discharge pipe (8) of the periodic blowdown flash tank (4) emits white smoke is reduced or eliminated, meanwhile, boiler feed water is preheated, and the temperature of the boiler feed water is increased. The boiler blow-off, temperature reduction, noise reduction and white smoke elimination system has the advantages that waste heat of blow-off water is fully utilized, the boiler feed water temperature is increased, the heat efficiency of the boiler can be indirectly improved, the temperature and flow of flash steam are reduced, the water content in the steam is effectively reduced, and energy is saved. Therefore, the phenomenon that the steam is diffused and emits white smoke is reduced, and the noise is reduced by utilizing the small-hole noise reduction principle.

The invention discloses a feed water reheating system based on boiler steam and boiler water compound circulation and an operation method, the system comprises a high-pressure heating water tank, a boiler water circulating pump and other equipment, and is obtained by additionally arranging a feed water reheating bypass on the basis of a conventional once-through boiler feed water system for improvement. And the boiler water circulating pump arranged on the supercritical once-through boiler starting system can be directly used, and no newly-added boiler water circulating pump is needed. The boiler furnace water cooling wall system outlet steam circulation is specifically used for reheating water supply, the temperature of boiler water entering a boiler furnace water cooling wall system inlet and the temperature of secondary air participating in combustion of a boiler furnace are increased, and therefore the heat exchange proportion of the boiler furnace is reduced, and the reheating steam temperature is increased. Meanwhile, the flow of the water cooling wall is increased through steam circulation, the hydrodynamic characteristic of the water cooling wall is improved, the downward adjusting range of the feed water flow is widened, and the low-load steam temperature of the boiler is increased. When the boiler is started or runs in a wet state, the boiler water separated by the boiler steam-water separator continues to be recycled to the inlet of the boiler economizer system, and the original function of the boiler water circulating pump is not affected.

The utility model relates to the technical field of water return systems of water feed pumps, in particular to a sealing water return system of a water feed pump of a thermal power plant, which provides redundancy when a water seal of the system is damaged, prolongs the operation time of workers and improves the usability of the system by arranging a labyrinth pipe and performing labyrinth sealing on the system. When the system water seal is damaged, the system is closed, the vacuum state of other parts of the system is maintained, loss is reduced, maintenance is convenient, and the maintainability of the system is improved; comprising a body; the water return device, the water seal device and the analysis deoxygenization device are all installed on the machine body, and the two labyrinth pipes and the two sets of electric control valves are all installed on the water return device.

The utility model relates to the technical field of condensate water recovery, in particular to a middle-end steam condensate water condensation recovery and steam-water separation device. Comprising a drainage condensate water pipeline, a steam condensate water recovery device, a condenser, a steam-water separator, a heat preservation water tank, a high-temperature hot water circulating pump, a softened water tank, a low-temperature hot water circulating pump, a boiler water feeding pump and connecting pipe fittings. According to the steam boiler, steam is output from the boiler, condensate water obtained after heat exchange during drying of heat using equipment is subjected to closed circulation cooling recovery, it can be guaranteed that in the steam and condensate water circulation process, steam condensate water recovery is effectively achieved, and meanwhile the heat efficiency of the steam boiler can be improved. The condensation recovery and steam-water separation technological process system for the middle-end steam condensate water is simple in structure, low in equipment manufacturing cost, convenient to maintain and safe to install and use, production loss of enterprises is reduced, production cost is reduced, and a series of problems of pollution, noise, production, safety, environment and the like are completely eradicated.

The invention relates to an ethylene glycol dealcoholization tower overhead gas waste heat recovery system and a control method thereof, and relates to the technical field of waste heat recovery, and the ethylene glycol dealcoholization tower overhead gas waste heat recovery system comprises an ethylene glycol dealcoholization tower for generating tower bottoms and overhead gas, the tower top gas waste heat boiler is used for generating low-pressure steam by utilizing tower top gas; the steam compressor is used for pressurizing the low-pressure steam; the reboiler is used for heating tower kettle liquid through the pressurized steam; the ethylene glycol dealcoholization tower is respectively communicated with the tower top gas waste heat boiler and the reboiler, after the ethylene glycol dealcoholization tower runs, tower top gas is conveyed to the tower top gas waste heat boiler, and tower bottoms are conveyed to the reboiler at the same time; the steam compressor is connected between the tower top gas waste heat boiler and the reboiler, low-pressure steam generated by the tower top gas waste heat boiler is pressurized through the steam compressor and used for heating tower bottoms in the reboiler, and part of the steam after heat exchange is condensed into steam condensate. The device has the effect of improving the utilization efficiency of the waste heat of the tower top gas.

The utility model discloses a system for reducing the steam consumption rate of a water feed pump turbine of a thermal power generating unit, which comprises a deaerator, a high-pressure heater and a water supply pipe fitting, and further comprises a return pipe fitting and an adjusting valve, and the adjusting valve comprises a quick-opening and quick-closing pneumatic ball valve, a small-flow pneumatic stop valve and a second small-flow recirculation adjusting valve. According to the utility model, the quick-opening and quick-closing pneumatic stop valve, the small-flow pneumatic stop valve and the small-flow recirculation control valve are additionally arranged. The quick-opening and quick-closing pneumatic ball valve is used for effectively avoiding the increase of energy consumption caused by inner leakage due to long-time washing of the feed pump recirculation control valve; under the condition of low flow of deep peak regulation feed water of the unit, part of feed water returns to the deaerator again through the small-flow recirculation pipe, and the problems of water temperature rise, cavitation, pressure building and the like in the pump are prevented; the problem that the steam consumption of the steam-driven feed pump is high due to the fact that the large-flow feed water recirculation control valve is protected and operates at a large opening degree is effectively solved through the small-flow recirculation pipe.

The utility model discloses a movable outdoor skid-mounted super heat source station which comprises a hoisting type movable machine room, a water purification unit, a pure water tank, a plurality of steam generators and a steam distribution cylinder, wherein the water purification unit, the pure water tank, the steam generators and the steam distribution cylinder are installed in the hoisting type movable machine room. According to the heat source station, the interior of the machine room is divided into the water supply area, the heat source generation area and the steam output area, and the water purification unit, the pure water tank, the steam generator, the steam distribution cylinder and other devices are reasonably arranged, so that the internal arrangement of the whole device is compact, the occupied area of the device is reduced, transportation is convenient, the integration degree is high, and automatic control is convenient to achieve.

This utility model discloses a warm-up system for an internal circulation pump in a natural circulation boiler, belonging to the technical field of boiler auxiliary equipment. It includes an internal circulation pump, a pre-pump pipeline and a post-pump pipeline respectively equipped with a first valve and a second valve connecting the downcomer to the economizer, a third valve connecting the lower part of the downcomer to the economizer inlet via a pipeline, a warm-up connection pipeline connecting the upstream of the second valve and the upstream of the third valve, and a flow meter, a fourth valve, and a regulating valve arranged sequentially. When the internal circulation pump is in standby mode, the first valve is kept open and the third valve closed, the fourth valve is opened, the electric regulating valve is opened, and the second valve is closed. The working fluid in the downcomer bypasses the pump through the pre-pump pipeline, the internal circulation pump, the post-pump pipeline, the warm-up connection pipeline, and the economizer recirculation pipeline, forming a closed natural circulation loop with the boiler evaporation system. This keeps the pump body hot and at the same temperature as the working fluid during standby. This system is mainly used in natural circulation boilers to maintain the internal circulation pump in a hot standby state, eliminating the risk of thermal shock during pump start-up.

The present invention relates to the technical field of condensate recovery, and discloses a high-pressure condensate pressure difference recovery structure and method, including: a condensate output pipe, the condensate output pipe extends into a condensate tank, and the lower end of the condensate output pipe is located at the lower part of the condensate tank; a steam booster pipe, the two ends of the steam booster pipe are respectively connected to a steam supply device and a condensate tank; an inlet valve, the inlet valve is arranged on a heat exchange pipe and is located between the heat exchanger and the condensate tank; a steam pressure input valve, the steam pressure input valve is arranged on the steam booster pipe. The high-pressure condensate pressure difference recovery structure disclosed in the present invention uses the steam supply device provided in the steam heating system and pressurizes the condensate tank through the steam booster pipe, and the water in the condensate tank flows into the condensate output pipe through the siphon effect, thereby providing power to transport the condensate to different places for recycling.

The present application relates to the field of energy saving and control technology of thermal power generation, in particular to a low-pressure heater drain system load control method for thermal power generating units and related equipment, real-time monitoring of the load of the thermal power generating unit, selection of a target drain control mode according to a preset load interval, wherein the first load interval corresponds to the first control mode, the second load interval corresponds to the second control mode, both have different control targets and logic, and the maximum value of the first interval is less than or equal to the minimum value of the second interval; the target mode control logic is executed to regulate the operating state of the drain system. Through load interval division and mode dynamic switching, the scheme realizes the reduction of energy consumption of the drain system, the reduction of system vibration frequency, achieves self-adaptive regulation and control of the drain system under all working conditions, and improves the operating efficiency and stability.