38results about "Water circulation" patented technology

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 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.

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 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.

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 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 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.

The invention discloses a rapid cooling method and system after leakage of a power station boiler economizer, and relates to the technical field of boiler safety control, and the method comprises the following steps: when a boiler is in a stuffy state, executing an economizer cooling preparation stage; entering a preliminary cooling stage after the preparation stage is finished, and starting a primary air fan; primary air enters a boiler flue through a pyrolyzing furnace ammonia spraying branch pipe, so that the primary air reversely flows to the cooling coal economizer from bottom to top; entering an intelligent control cooling stage after the preliminary cooling stage is completed, accurately adjusting the cooling air volume and the airflow path through an intelligent control algorithm, and starting a urea spray gun to carry out flushing water auxiliary cooling; monitoring the temperature of the leakage area in real time and automatically adjusting the cooling air volume according to the temperature of the leakage area. According to the method, when leakage of the economizer occurs, rapid cooling of the economizer area can be achieved. The coal economizer area temperature is effectively reduced, the cooling time is shortened to the maximum extent, and the boiler coal economizer overhaul progress is accelerated.

The utility model discloses a boiler preheating and heat recovery system which comprises a conduction oil boiler, a steam generator, a water storage tank and a water supply device, a water jacket is arranged on the periphery of the outer wall of the conduction oil boiler, the water jacket is connected with the water storage tank through a water inlet pipe and a water return pipe respectively, and the conduction oil boiler is connected with the steam generator through a conduction oil circulating pipeline. The water supply device comprises a water softening device, a first softened water tank and a second softened water tank, the first softened water tank is connected with a tap water pipe through the water softening device, connected with the water storage tank through a first water outlet pipe and connected with the steam generator through a second water outlet pipe, and the second softened water tank is connected with the water storage tank through a first water inlet pipe. The third water outlet pipe is connected with the steam generator. The heat of the boiler body can be recovered when the boiler enters a shutdown state, and stored hot water can be injected into the water jacket before the boiler is started next time, so that the boiler body is preheated and warmed up, the heat efficiency of the boiler in the starting stage is improved, and the boiler is energy-saving and efficient.

This invention discloses a coupled operation system and method for molten salt reactor power generation, energy storage, and heating, including a reactor primary loop, a molten salt secondary loop, a high- and low-temperature molten salt energy storage and release loop, a molten salt reactor power generation loop, and a heating loop. The reactor primary loop is connected to the molten salt secondary loop, and the molten salt secondary loop is connected to the high- and low-temperature molten salt energy storage and release loop, the molten salt reactor power generation loop, and the heating loop. This system and method can realize the coupled operation of molten salt reactor heating and power generation, achieving energy cascade utilization, while ensuring the stability of system operation.

Method of conversion of installations of the type used for the hybrid propulsion of LNG carriers wherein said method is based on modifying a LNG carrier boiler of the installation, modifying the existing exhaust outlet integrating a new exhaust gas outlet, creating an opening in a combustion chamber of said LNG carrier boiler, introducing exhaust gases from a GTPG inside the opening created and adding a second superheater inside the exhaust gas outlet between the GTPG and the LNG carrier boiler, integrating an auxiliary steam and water system and integrating an automatic switching extraction system connected both system to the hybrid propulsion installation.

The invention discloses a fuel gas, electricity and air energy coordinated coupling electrode boiler heat storage system which comprises an isolation room, a furnace shell, a phase electrode and a zero electrode, the furnace shell is arranged in the isolation room, the phase electrode is arranged in the furnace shell, and the zero electrode is arranged in the furnace shell. The device further comprises a first insulation supporting piece, a second insulation supporting piece and a conductive connecting piece, the first insulation supporting piece is arranged in the furnace shell, the zero position electrode is directly or indirectly arranged on the first insulation supporting piece, the second insulation supporting piece is arranged on the furnace shell and located outside the furnace shell, and the conductive connecting piece is arranged on the second insulation supporting piece. The second insulating supporting piece is located between the furnace shell and the ground, the zero electrodes are connected through the conductive connecting piece and serve as a neutral point, the furnace shell serves as a zero point, and insulating rings are connected to a water outlet and a water inlet of the furnace shell and located between the outer wall of the furnace shell and the inner wall of the isolation room. And the isolation room is grounded.

The invention discloses a steam turbine exhaust steam waste heat and boiler flue gas waste heat combined utilization system and method, and the system comprises a demineralized water circulation heat exchange system which comprises an exhaust steam heat exchanger, a circulating pump and a water medium air heater; the circulating pump is used for conveying the low-temperature demineralized water to the steam exhaust heat exchanger and conveying the heated medium-temperature demineralized water to the water medium air heater; the water medium air heater is used for heating boiler secondary air based on the medium-temperature demineralized water; the boiler flue gas waste heat recovery system comprises a first-stage low-temperature economizer and a second-stage low-temperature economizer. The first-stage low-temperature economizer is used for heating condensed water of a main turbine based on boiler flue gas; the second-stage low-temperature economizer is used for selectively heating medium-temperature demineralized water in the demineralized water circulating heat exchange system based on the boiler flue gas passing through the first-stage low-temperature economizer; and the condensed water heating pipeline is used for conveying condensed water of the main steam turbine to the first-stage low-temperature economizer and returning the heated condensed water of the main steam turbine to an inlet of the next-stage low-pressure heater.

This invention relates to the field of steam heat pump unit technology, and particularly to a cascade preheating energy storage steam heat pump unit and its control method. It integrates energy storage and flash evaporation, achieving high utilization, system simplicity, and space saving. The unit can seamlessly switch between energy storage operation, energy storage steam generation, and direct steam generation operation modes. After the stored hot water is used up, it can automatically switch to direct steam generation mode as needed, facilitating steam output adjustment and providing comfortable and convenient use. During long-term shutdowns, the cooled hot water in the energy storage flash tank can be directly preheated, and new water entering from the inlet can be preheated progressively through the first and second heat exchangers. The use of refrigerant liquid makeup water cooling significantly improves the refrigerant's liquid subcooling. The various systems complement each other, greatly improving the energy efficiency ratio of the heat pump system, enhancing operational reliability while saving energy.

A water heater dip tube includes an elongated body having an inlet end and an outlet end. An inner volume is arranged within the elongated body. An anti-siphon orifice is arranged along the elongated body proximate the inlet end. The anti-siphon orifice extends through a wall of the elongated body. The dip tube further includes an elastomeric membrane secured to the elongated body. The elastomeric membrane is arranged in the vicinity of the anti-siphon orifice. The elastomeric membrane is operable to block fluid flow through the anti-siphon orifice when a pressure at the inlet end is greater than a pressure at the exterior of the dip tube adjacent to the anti-siphon orifice, and to allow fluid flow through the anti-siphon orifice when a pressure at the inlet end is less than a pressure at the exterior of the dip tube adjacent to the anti-siphon orifice.