21results about "Water circulation" patented technology

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 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 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.

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 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 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.

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.

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.

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.

The present application relates to a kind of solid and molten salt heat storage system and its method for combined heat and power peak shaving, including steam turbine unit, high-temperature solid heat storage subsystem, low-temperature molten salt heat storage subsystem and water supply subsystem, high-temperature solid heat storage subsystem includes high-temperature solid heat accumulator, high-temperature fan and steam superheater, low-temperature molten salt heat storage subsystem includes low-temperature molten salt hot tank, molten salt heat-releasing steam generator, molten salt heat-releasing water supply heater, low-temperature molten salt cold tank and low-temperature molten salt heating assembly, water outlet of water supply subsystem, molten salt heat-releasing water supply heater, molten salt heat-releasing steam generator, steam superheater and steam turbine unit steam inlet are sequentially communicated to constitute steam supply circuit;Low-temperature molten salt heating assembly steam inlet and steam turbine unit reheat steam outlet are communicated for heating low-temperature molten salt;This system is by series connection setting low-temperature molten salt heat storage subsystem and high-temperature solid heat storage subsystem, realize wide temperature range heat storage and high-temperature high-quality heat energy utilization, solve the problem of traditional heat storage system operation temperature zone is narrower.

Heat conduction oil enters an oil-gas separator (4) through a heat conduction oil pump (1), a phase change heat exchanger (2) and a heat utilization unit (3), organic heat carriers separated by the oil-gas separator (4) return to the heat conduction oil pump (1), and water vapor (11) generated by a phase change boiler body (10) heats the organic heat carriers through the phase change heat exchanger (2) to supply heat to the heat utilization unit (3). Condensed water (8) generated by the phase change heat exchanger (2) returns to the phase change boiler body (10) through the circulating water pump (9), water in the buffer tank (22) passes through the micro water pump (18), the gas-water heat exchanger (19) and the external air pre-heater (14) and then returns to the buffer tank (22), and air sucked in by the air blower (13) is heated through the external air pre-heater (14) and then is fed into the combustor (16) for combustion of fuel (17).

This invention discloses a thermal power peak-shaving system and method using a steam ejector coupled to a single-tank molten salt thermal storage system, belonging to the field of thermal power peak-shaving technology. The system includes: a superheater, a reheater, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a condenser, a low-pressure heater, a deaerator, a high-pressure heater, a steam ejector, an integrated molten salt thermal storage and exchange tank, a separator, a steam booster pump, and a feedwater booster pump. During periods of low electricity or heating demand, exhaust steam from the main steam ejector turbine is mixed through the steam ejector and enters the molten salt tank, storing the heat of the steam in the high-temperature molten salt. During periods of high electricity or heating demand, the high-temperature molten salt is used to heat boiler feedwater or municipal heating return water. This method achieves both power peak-shaving and thermal-electrical decoupling. The use of a single-tank molten salt system effectively avoids the drawbacks of high investment and complex equipment in traditional dual-tank systems, while the steam ejector enables the cascaded utilization of steam energy, achieving energy conservation.

The invention provides a circulating water quality control system and method for an indirect air cooling system. The circulating water quality control system comprises a circulating water supply mother pipe and a circulating water return mother pipe which are connected between a condenser and a cooling tower; a hot side inlet of the plate heat exchanger is connected with the circulating water supply main pipe, and a side inlet is connected with boiler make-up water raw water; one end of the circulating water bypass flow treatment unit is connected with a hot side outlet of the plate heat exchanger, and the other end of the circulating water bypass flow treatment unit is connected with the circulating water return mother pipe; one end of the boiler make-up water treatment unit is connected with a cold side outlet of the plate heat exchanger, and the other end is connected with a water outlet pipeline of the condenser; the plate heat exchanger heats raw water of boiler make-up water through circulating water of the circulating water supply main pipe, the cooled circulating water returns to the circulating water return main pipe, and the heated raw water enters the boiler make-up water treatment unit. The circulating water bypass flow system is arranged in the indirect air cooling system, heat of circulating water bypass flow is used for heating boiler make-up water through the plate heat exchanger, waste heat recycling is achieved, and energy consumption is reduced.