348results about "Feed water supply" patented technology

The invention discloses a fused salt heat storage and Carnot cell combined coal-fired unit peak-load regulation operation method, device and equipment, a medium and a product, and relates to the field of unit peak-load regulation operation. Acquiring information data; based on a power regulation demand prediction model, performing peak regulation demand prediction according to the information data to obtain a prediction result; the power regulation demand prediction model is obtained by adopting a multi-objective optimization model and performing time sequence analysis on a long-short-term memory network model; determining an energy scheduling strategy based on the prediction result; the energy scheduling strategy comprises a heat storage power coordination instruction and a heat release power coordination instruction; and according to the energy scheduling strategy, operation adjustment is conducted on the coal-fired unit, the fused salt heat storage subsystem and the Carnot battery subsystem based on the control system. The invention aims to improve the peak regulation performance of the coal-fired unit.

The invention discloses a circulating fluidized bed boiler water supply optimization method and system, and belongs to the technical field of boiler energy conservation. The system mainly comprises a condensate water tank, a demineralized water tank, a slag cooler, a deoxygenization water tank, a condensate water pump, a demineralized water pump, a plate heat exchanger, a reverse osmosis membrane group, a demineralized water buffer tank and the like. The principle of'condensate water priority 'is adopted, the supply amount of condensate water is preferentially adjusted according to the liquid level of the deoxygenated water tank through the intelligent control unit, and the insufficient part is supplemented by demineralized water; the demineralized water subjected to heat exchange by the slag cooler is intelligently distributed to a demineralized water tank, a condensation water tank or a deoxygenization water tank according to the water outlet temperature; the plate heat exchanger can preheat reverse osmosis inlet water by adopting a desalting water mode or a steam mode; the demineralized water buffer tank effectively inhibits water impact. Dynamic balance and heat energy gradient utilization of steam condensate water and demineralized water are achieved, the problems of water tank overflow and energy waste are effectively solved, and the economical efficiency and stability of boiler operation are remarkably improved.

The invention discloses a double-turbine power generation device suitable for a thermal power generating unit, relates to the technical field of thermal power generation, and mainly aims to improve the power generation efficiency of the thermal power generating unit. According to the main technical scheme, a boiler system is connected with steam inlet valves of a first steam turbine power generation sub-set and a second steam turbine power generation sub-set through pipelines, and corresponding steam is conveyed to the two sub-sets by adjusting the opening degree of a valve to be matched with a load distribution target. After the two subsets do work, part of steam is fed into a steam extraction heat regeneration system to recover heat and is used for heating boiler feed water; and the residual exhaust steam enters the condenser system to be condensed into water, and the condensed water is conveyed to the steam extraction heat regeneration system to be heated to become boiler feed water, so that circulating power generation is realized.

The invention relates to the technical field of high-efficiency recovery of low-temperature exhaust gas, in particular to a high-temperature cooking waste heat recovery system for white spirit brewing. The white spirit brewing high-temperature cooking waste heat recovery system comprises a cooking barrel, a compressor, an embedded plate heat exchanger, a condensate water tank and a circulating pump, a liquid inlet of the cooking barrel is communicated with one end of a water supplementing pipe, an air inlet of the compressor is communicated with a waste gas outlet of the cooking barrel, and the compressor is used for compressing steam to obtain high-temperature and high-pressure steam. A steam inlet of the embedded plate heat exchanger is communicated with an air outlet of the compressor, and a steam outlet of the embedded plate heat exchanger is communicated with a steam inlet of the cooking barrel through a steam conveying pipe. By adopting the arrangement mode, waste heat steam is utilized twice to recover heat, high-efficiency energy utilization can be realized, energy consumption and carbon emission are reduced, and meanwhile, the cooking efficiency and the grain quality are improved.

The application provides a steam condensate waste heat recycling device, and relates to the field of heat energy recovery.The steam condensate waste heat recycling device comprises a base, a heat preservation cylinder arranged on the base, and a synchronous adjusting mechanism arranged on the heat preservation cylinder.The steam condensate waste heat recycling device can conveniently collect condensate water into a required device, and the high-temperature condensate water can not lose a large amount of heat through a pipeline and a surface of equipment during a transmission process, so that heat energy is not wasted.The synchronous adjusting mechanism drives a conveying pump to quickly transfer the condensate water in the heat preservation cylinder to a required place, so that the condensate water recovery efficiency is improved.The synchronous adjusting mechanism solves the problem of waste of condensate water waste heat in the prior art.The synchronous adjusting mechanism solves the problem of equipment damage caused by heat shock in the prior art.The synchronous adjusting mechanism solves the problem of increased thermal resistance caused by scale accumulation in the prior art.

The invention discloses a steam utilization device for steam turbine overhaul, and belongs to the technical field of steam utilization, the steam utilization device comprises an equipment base, a heat exchange box body is fixedly mounted at the top of the equipment base, the top of the heat exchange box body is fixedly connected with an evaporation boiler through a heat conduction structure, and the evaporation boiler and the heat exchange box body are in heat conduction fit; an energy conversion shell is fixedly installed at the position, close to the heat exchange box body, of the top of the equipment base, a first-stage condenser is fixedly installed at the position, close to the energy conversion shell, of the top of the equipment base, and the inlet end of the first-stage condenser communicates with the outlet end of the energy conversion shell in a sealed mode through a pipeline. High-temperature and high-pressure steam firstly enters the heat exchange rectangular pipe to release heat energy, condensate water containing impurities is evaporated and purified through the discharged high-temperature steam, thorough separation of the impurities and a water body is achieved, and the situation that steam water containing the impurities enters a steam turbine again to pollute the steam turbine is fundamentally avoided.

The application relates to a combined heat and power system, which comprises a boiler, a generator unit, a molten salt heat storage subsystem and a steam heat storage subsystem; the generator unit comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; the molten salt heat storage subsystem comprises a cold salt tank, a hot salt tank, a heat storage heat exchanger and a heat supply heat exchanger, the heat storage heat exchanger is provided with a first low-temperature medium flow channel and a first high-temperature medium flow channel, the heat supply heat exchanger is provided with a second low-temperature medium flow channel and a second high-temperature medium flow channel; the first high-temperature medium flow channel is connected with a steam extraction end of the medium-pressure cylinder; one end of the second low-temperature medium flow channel is connected with a water supply end, and the other end is connected with a heat user; the steam heat storage subsystem comprises a steam heat storage tank, an input end of the steam heat storage tank is connected with the steam extraction end of the medium-pressure cylinder, an output end is connected with a steam inlet end of the low-pressure cylinder, and the steam heat storage tank has the advantages of being able to meet different scheduling requirements and increasing the flexibility of scheduling.

The application discloses a flue gas heat energy and condensate water utilization system, which comprises a boiler, a flue gas cooling device, and a deoxygenated water tank. The flue gas generated by the boiler combustion enters the flue gas cooling device through a first flue for cooling. The flue gas exchanges heat with the water in the condensate water tank, the water in the condensate water tank is heated, the flue gas is cooled, and the cooled flue gas is discharged through a second flue. The condensate water formed in the flue gas cooling process falls into the condensate water tank. The water in the condensate water tank is deoxygenated by the deoxygenated water tank and then flows back to the boiler. The flue gas heat energy generated by the boiler combustion is utilized, the slightly acidic condensate water generated by the flue gas is mixed with the slightly alkaline softened water and the boiler water, the acidic condensate water and the alkaline softened water and the boiler water are subjected to acid-base neutralization reaction, the flue gas is used to heat the condensate water, and the like, so that the flue gas condensate water does not contain acidic gas, and thus the flue gas condensate water is slightly alkaline water suitable for the utilization of the boiler.

This invention provides a boiler system that can effectively utilize the heat contained in ammonia decomposition gas. Furthermore, it provides a boiler system that can maintain the temperature of the ammonia decomposition gas at the boiler inlet within a predetermined temperature range. [Solution] The boiler system comprises an ammonia decomposition device that decomposes ammonia to produce ammonia decomposition gas containing hydrogen and nitrogen, a boiler that burns the ammonia decomposition gas as fuel, an ammonia decomposition gas supply line that supplies the ammonia decomposition gas from the ammonia decomposition device to the boiler, a feedwater line that supplies feedwater to the boiler, and a heat exchanger that heats the feedwater by exchanging heat between the ammonia decomposition gas and the feedwater.

The utility model relates to the technical field of high-pressure sterilization, and discloses a high-pressure sterilization cooling device which comprises a barrel body, a cover plate is clamped at the top of the barrel body, a sterilization assembly is installed on the side wall of the barrel body and used for high-temperature and high-pressure sterilization, and a cooling assembly is installed at the bottom of the cover plate and used for cooling an inner cavity of the barrel body. The sterilization assembly comprises a placement plate, the placement plate is fixedly mounted on the inner wall of the barrel body, and air holes are formed in the surface of the placement plate; according to the high-pressure sterilizing and cooling device, raw materials are placed on the surface of the placing plate, the cover plate is used for sealing the barrel body, the steam generator is driven to charge steam into the inner cavity of the barrel body through the air outlet pipe, the air holes are formed in the surface of the placing plate, then the steam can flow upwards through the air holes, the raw materials are promoted to move in the process, and meanwhile a threaded column drives a rotating plate to rotate; the raw materials are stirred, so that the raw materials can be in uniform contact with steam, the raw materials are subjected to high-pressure and high-temperature sterilization, and the high-temperature sterilization time is shortened.

The embodiment of the invention provides a system, method and device for improving heat supply energy of a steam turbine, and the system comprises a heat supply steam extraction pipeline with the inlet end connected to a medium-low pressure communicating pipe and the outlet end connected to an external heat supply network; the hydraulic control butterfly valve is arranged on the medium-low pressure communicating pipe, is positioned at the downstream of the inlet of the heat supply steam extraction pipeline, and is used for cutting off or conducting steam flowing to the low-pressure cylinder; the inlet end of the cooling steam bypass is connected to the medium-low pressure communicating pipe and located on the upstream of the hydraulic control butterfly valve, and the outlet end of the cooling steam bypass is connected to a steam inlet of the low-pressure cylinder and used for introducing cooling steam into the low-pressure cylinder when the hydraulic control butterfly valve is cut off; the Roots-water ring vacuum pump set is connected to a steam exhaust port of the low-pressure cylinder and used for establishing and maintaining a high-vacuum environment of the low-pressure cylinder; and the drainage unit is connected to the low point of the heat supply and steam extraction pipeline and used for discharging condensed water in the heat supply and steam extraction pipeline. The heat supply and steam extraction capacity of the unit is remarkably improved, and meanwhile safe cooling of the low-pressure cylinder and reliable operation of the system are guaranteed.

The present application relates to water vapor application technical field, disclose a kind of water vapor flow regulating system, its technical scheme main point is including heating part, the heating part is configured as heating to be heated object, further including reflux tank, the reflux tank is configured as the water vapor and liquid separated by the heating part discharge;And heating tank part, the heating tank part is configured as obtaining the liquid in the reflux tank is heated and provides water vapor to the heating part;And the present application sets a set of steam heating pipeline system, compares according to actual heating demand, real-time control adjusts the temperature and dosage of heating part steam, and flow meter, temperature sensor, differential pressure sensor and pressure sensor on each pipe are calculated.

The utility model discloses a low-temperature coal economizer system capable of being flexibly switched. The low-temperature coal economizer system capable of being flexibly switched comprises a condensation water pipeline, a low-temperature coal economizer high-temperature section, a low-temperature coal economizer low-temperature section and an air heater. The water inlet end and the water outlet end of the condensed water pipeline are connected with a water inlet main pipe and a water return main pipe correspondingly, and inlets of the low-temperature economizer high-temperature section and the low-temperature economizer low-temperature section are connected with inlet branch pipes which are arranged in parallel and provided with the inlet ends connected with the water inlet main pipe. Outlets of the low-temperature economizer high-temperature section and the low-temperature economizer low-temperature section are connected with outlet branch pipes which are arranged in parallel, and the outlet ends of the outlet branch pipes are connected with the water return main pipe. A series pipeline is connected between the outlet end of the low-temperature section of the low-temperature economizer and the inlet end of the high-temperature section of the low-temperature economizer; outlets of the low-temperature economizer high-temperature section and the low-temperature economizer low-temperature section are connected with air heater water inlet branch pipes which are connected with a water inlet pipeline of the air heater after being connected in parallel, and an air heater water outlet pipe is connected between the water outlet end of the air heater and the water return main pipe.

The invention relates to the technical field of energy recovery and power engineering, and discloses a cantilever type saturated steam turbine and a using method thereof.The cantilever type saturated steam turbine comprises a cantilever type turbine unit, the cantilever type turbine unit comprises an installation outer shell and a turbine wheel disc assembly installed in the installation outer shell, and the turbine wheel disc assembly is connected with a rotor main shaft; the turbine wheel disc assembly comprises a turbine impeller and a turbine blade piece installed on the turbine impeller. The water catching assembly comprises a water collecting ring and a water draining cavity formed in one side of the water collecting ring, and a water collecting groove is formed in the side edge of the water collecting ring; a mounting bearing is mounted on one side of the cantilever type turbine unit, a gear box is connected to one side of the cantilever type turbine unit, and a condenser is connected to the cantilever type turbine unit; the problems that in the prior art, the structure is complex, cost is high, blade erosion is serious, efficiency improvement is limited, meanwhile, the equipment size is large, starting is complex, the response speed is low, and the waste heat recovery temperature lower limit is low are solved.

The utility model discloses an air-steam heater with a dead steam recovery device for a boiler, which comprises a heater cylinder, an air inlet and an air outlet are respectively arranged at two ends of the heater cylinder, and an input end of a heat exchange tube bundle in the heater cylinder is connected with a high-temperature and high-pressure steam input tube. A heat exchange discharge pipe at the output end of the heat exchange pipe bundle is connected with a dead steam conveying pipe and a condensate water conveying pipe, the dead steam conveying pipe is connected with a steam-water recovery device, and the steam-water recovery device comprises a condensation mechanism and a steam-water recovery device output pipe; the condensate water conveying pipe is connected to a condensate water recycling barrel, a recycling barrel condensate water output pipe is arranged on the condensate water recycling barrel, the recycling barrel condensate water output pipe is connected with a condensate water conveying pump, and the condensate water conveying pump is connected to a deaerator through a delivery pipe; an output pipe of the steam-water recycling device is connected to the condensate water recycling barrel. The waste steam and condensate water recycling device has the advantages that the waste steam and the condensate water are recycled, so that water resources can be greatly saved, and the operation cost of the boiler is effectively reduced.

The present application relates to the technical field of energy storage, and relates to an energy storage system based on thermochemical energy storage and Rankine cycle and an operation method. The energy storage system comprises a storage device, an energy storage device, an energy release device and a power generation device. The energy storage device comprises a calcium carbonate rotary calcining kiln, a first heat exchanger network and an electric heater, and the structural components are sequentially connected. The electric heater is used to convert excess electricity into heat energy, the calcium carbonate decomposition reaction is carried out in the calcium carbonate rotary calcining kiln, the heat energy is converted into chemical energy stored in calcium oxide, the energy release device is used to convert the chemical energy stored in calcium oxide into heat energy, the heat energy is converted into electricity by the power generation device, and the electricity demand of the terminal user is met. The energy storage system provided by the present application can realize the conversion, transmission and storage of different energies, has high energy conversion efficiency, can effectively reduce the coal consumption in the energy conversion process, and meets the energy saving and carbon reduction and flexibility reconstruction requirements of coal-fired power plants.

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.

The invention discloses a feed water recycling energy intelligent recovery system based on a double-input gear box, and relates to the technical field of thermal power plant energy saving. The system comprises a water supply main path, a recirculation loop, an energy recovery branch and a driving transmission system. The driving transmission system adopts a double-input gear box and is respectively connected with a driving steam turbine and a first-stage hydraulic turbine through two clutches, so that three modes of pure steam driving, pure liquid driving and hybrid driving of the booster pump are realized. The intelligent control system switches modes on line according to working conditions, and energy recovery is maximized on the premise that safety is guaranteed. The device solves the problem of mechanical coupling of hydraulic turbine energy recovery and an existing steam feed pump system, has the advantages of being high in efficiency, stable in switching, high in space adaptability, safe, reliable and the like, and is suitable for energy-saving transformation of a large thermal power generating unit.

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

The utility model discloses a waste incineration plant low-pressure heater heat exchange system which comprises a steam turbine, a low-pressure heater and a condenser, the steam turbine is connected with a steam inlet chamber of the condenser through a steam exhaust pipeline, the steam turbine is connected with a steam side inlet of the low-pressure heater through a steam extraction pipeline, and a steam side outlet of the low-pressure heater is connected with the condenser through a drainage pipeline. The condenser is connected with a water side inlet of the low-pressure heater through a first condensation water pipeline, and a condensation water pump is arranged on the first condensation water pipeline. A water side outlet of the low-pressure heater is connected with the deaerator through a second condensation water pipeline, a steam side outlet of the low-pressure heater is connected with the second condensation water pipeline through a drainage recovery pipeline, and a low-pressure heater drainage pump is arranged on the drainage recovery pipeline. The drain water can be prevented from being recycled to the condenser repeatedly, the temperature of the drain water is prevented from being reduced, the working pressure of the condenser is prevented from being influenced, and heat economy is effectively improved.

The application belongs to the technical field of combined heat and power supply, and particularly relates to a gas-steam combined cycle waste steam heat supply system, which comprises a gas turbine, a first heat exchange part connected with the gas turbine, a steam turbine connected with the first heat exchange part, a second heat exchange part and a cooling mechanism connected with the steam turbine, a user heat supply part connected with the second heat exchange part, a first valve arranged between the steam turbine and the second heat exchange part, a second valve arranged between the steam turbine and the cooling mechanism, and the cooling mechanism and the second heat exchange part being connected with the first heat exchange part. The application can realize large-area heating without extracting high-quality steam and improving the steam turbine exhaust parameter, and the second heat exchange part can bear part or all of the cooling load of the cooling mechanism, so that the power consumption of the cooling mechanism is reduced or zero, energy is saved, and the overall efficiency of the combined cycle is improved.

The invention belongs to the technical field of combined heat and power generation units, and particularly relates to a combined heat and power generation unit peak regulation system with an ultrahigh-temperature heat pump coupled with fused salt energy storage. According to the technical scheme, in the heat storage process, a combined heat and power generation unit operates under the lowest load working condition, a boiler is in the lowest stable combustion load, a certain amount of main steam is extracted to heat fused salt, sensible heat of the main steam is stored in the fused salt, and the main steam obtained after heat exchange is decompressed through a pressure reducing valve and then supplied to low-pressure steam; meanwhile, low-temperature steam serves as a low-temperature heat source in the ultra-high-temperature heat pump system with air as a circulating medium, steam flowing out of a boiler low-temperature reheater enters a low-temperature heat exchanger to heat the air, the steam obtained after heat exchange continues to enter a boiler high-temperature reheater to absorb heat to become reheated steam, and then the reheated steam enters a steam turbine intermediate-pressure cylinder to do work; meanwhile, a motor in the ultra-high-temperature heat pump system can consume the cogeneration unit to generate power, and the purpose of zero-load output is achieved. In the heat release process, heat stored by the fused salt is released into feed water to generate high-temperature and high-pressure steam and reheat steam which enter a high-pressure cylinder and an intermediate-pressure cylinder of a steam turbine to do work, and the load rising rate and the peak power generation capacity of the unit are improved; and meanwhile, part of the generated high-pressure steam and low-pressure steam are supplied externally, so that the requirement of industrial steam is met. The problems that in the peak regulation process of the cogeneration unit, the peak regulation capacity is small, and the boiler operation safety and external supply industrial steam parameters under the low load are limited are solved.

The utility model belongs to the field of chemical engineering, and particularly relates to a water inlet system of a deaerator. The water inlet system of the deaerator comprises a flash tank used for carrying out flash evaporation on first fluid to obtain second fluid, and the first fluid is high-pressure condensate, medium-pressure condensate or a mixture of the high-pressure condensate and the medium-pressure condensate; the condensate refining system is used for purifying third fluid to obtain fourth fluid, and the third fluid is low-pressure condensate, compressor turbine condensate or a mixture of the low-pressure condensate and the compressor turbine condensate; the heat exchanger is used for conducting heat exchange on the second fluid and the fourth fluid, and the second fluid and the fourth fluid are converted into fifth fluid and sixth fluid correspondingly; the liquid level adjusting valve is used for reducing the pressure of the fifth fluid to obtain seventh fluid; and the deaerator is used for deoxidizing the seventh fluid and the sixth fluid. According to the water inlet system of the deaerator, the heat exchanger is additionally arranged in front of the liquid level adjusting valve, on the premise that no extra energy is consumed, saturated high-pressure and medium-pressure condensate is converted into over-condensate, and meanwhile low-pressure condensate after heat exchange and condensation of a turbine of the compressor are still in an over-cooling state. According to the utility model, the vaporization rate of fluid throttled by the liquid level regulating valve is greatly reduced, and the problems of thinning, even perforation and failure caused by two-phase flow erosion of the water inlet pipeline of the deaerator are relieved.

The utility model provides a steam condensate water recycling system for a chemical industry park, and belongs to the technical field of steam condensate water recycling. The system comprises a drain valve, a first condensate pump, a condensate pipe network, a condensate water tank, a second condensate pump, a plate heat exchanger and a heat pump system. And through the arrangement that the plate heat exchanger is coupled with the heat pump system, the waste heat of the condensate water is further recovered, and ideal condensate water waste heat recovery is achieved. The system further comprises an iron removal device, an oil removal device and a condensate water recovery system for fine treatment, the condensate water recovery system for fine treatment is connected with the heat pump system in parallel, and the problems that waste heat utilization is not thorough and water and heat utilization requirements change along with seasons can be solved. According to the steam condensate water recycling system for the chemical industry park, the waste heat utilization efficiency is high, condensate water is utilized more thoroughly, and the requirements of users for heat and various different process water can be met.

According to the condensed water heating device, the heat pump is arranged to utilize heat in circulating cooling water after heat exchange with steam in the condenser, low-grade heat in the circulating cooling water is converted into high-grade heat, and the generated high-grade heat and condensed water output by the condenser are subjected to heat exchange in the heat exchanger; the condensed water is preheated and then input into a deaerator to be deoxygenated, and then the deoxygenated and heated condensed water is heated to the preset temperature through a heater and then introduced into a boiler to be recycled. According to the device, through the arrangement of the heat pump, heat in circulating cooling water is recycled to be used for heating steam condensation water, and the defects that in a traditional condensation water system, due to the fact that the supercooling degree of the condensation water is too large, boiler fuel consumption is too high, and the oxygen content in the condensation water is too high, and a pipeline is prone to being corroded are overcome. In addition, heat in circulating water can be utilized by arranging the heat pump, and the advantage of saving energy is achieved.

The application provides a thermal power station circulating cooling water waste heat recycling system and a working method thereof. The system uses waste heat generated by cooling of thermal power station equipment to heat raw water or desalted water, improves water production capacity of the desalted water, and reduces circulating water pollution. A coagulation sedimentation tank, a filter tank and a water storage tank are connected in sequence. A temperature detector is installed on an inlet pipe of the filter tank. The water storage tank is connected with a production water supply system, a desalted water production system and a desalted circulating water supply pipe. An outlet bypass pipe is connected with the coagulation sedimentation tank and a cooling tower. A backwater bypass pipe is connected with the coagulation sedimentation tank and a circulating water backwater main pipe. Temperature detectors and regulating valves are installed on the outlet bypass pipe and the backwater bypass pipe. A desalted circulating backwater pipe is connected with the desalted water production system and the circulating water backwater main pipe. A desalted circulating water supply pipe is connected with a circulating water supply main pipe. Isolation valves are installed on the desalted circulating water supply pipe, the desalted circulating backwater pipe, the circulating water supply main pipe and the circulating water backwater main pipe.

Provided in the present invention are a flue-gas-heat-storage-based frequency regulation method and apparatus for a thermal power unit including a low-temperature economizer. The method comprises: in response to a power-grid frequency deviation exceeding a dead zone, starting up a steam-turbine governor system, and on the basis of the steam-turbine governor system and the power-grid frequency deviation, calculating an expected power increment of a thermal power unit, an expected frequency variation of a condensate-water throttling condensate pump, and an expected fan frequency variation of a variable-frequency fan in a flu gas duct; on the basis of the expected frequency variation of the condensate-water throttling condensate pump and the expected fan frequency variation, controlling one or a combination of a flow-regulating valve in a condensate and extraction direction, a flow-regulating valve in a condensate and flue gas direction, and the fan frequency of the variable-frequency fan in the flue gas duct, so as to obtain a power control result; and when the power control result satisfies the requirement of the expected power increment of the thermal power unit, obtaining a frequency regulation result after the completion of frequency regulation. The present invention solves the problems in the prior art of the frequency regulation capability and utilization of flue-gas waste heat being insufficient.

The utility model provides a system configuration for a coal power unit to adapt to deep peak regulation flexible operation, which is characterized in that a newly-added external steam cooler is arranged at an existing final-stage high-pressure water supply outlet of a water supply pipeline, and a steam side inlet of the newly-added external steam cooler is connected with a pressurization module; steam lower than the target steam extraction pressure grade is introduced into an inlet of the pressurization module, and a steam side outlet of the newly-added external steam cooler communicates with a steam inlet of an existing final-stage high-pressure heater; the steam lower than the target steam extraction pressure grade is pressurized by the pressurization module, firstly enters the newly-added external steam cooler to heat the feed water, and then enters the existing final-stage high-pressure heater to heat the feed water, so that the temperature of the feed water entering the furnace of the unit is increased; and meanwhile, a certain feed water pressure is maintained, so that feed water at an outlet of the economizer is kept at a certain supercooling degree, dry-state operation of the boiler is maintained under the deep peak regulation working condition, the hydrodynamic stability is maintained, and the denitration system is continuously and stably put into operation.

The present invention relates to a system and a method for automatically setting a main steam condensate drain valve closing setpoint of a nuclear power plant, and, specifically, to a system and a method for automatically setting a main steam condensate drain valve closing setpoint of a nuclear power plant, which apply different setpoints to respective condensate drain valves since the pressure of main steam and a condenser of a nuclear power plant varies according to operating conditions such as turbine output, and the discharge speeds of the condensate vary according to the different installation positions of condensate drain valves.

The invention belongs to the technical field of electric power engineering. The efficient heat energy storage power generation system solves the problem that the efficiency is low due to cold source loss of a conventional steam turbine power generation system, a low-temperature water storage device supplies water to a condenser, and steam exhaust heat of a steam turbine is recycled and then stored in a high-temperature water storage device after being heated; in the off-peak electricity period, the two stages of heat pumps take heat from the high-temperature water storage device (or the auxiliary heat source), heat the fused salt and store the fused salt in the corresponding hot salt tanks; in the peak period, the hot molten salt heats feed water in the evaporator to generate steam, the steam is treated by the superheater and the reheater to drive the steam turbine to do work and generate electricity, meanwhile, heat of the condenser is recycled to the high-temperature water storage device, the system can also be matched with a molten salt electric heater to utilize valley electricity, cold source loss can be eliminated, and the peak regulation requirement of a power grid is met. Cold source loss of a conventional steam turbine power generation system is eliminated, graded storage and utilization of heat are achieved, and different temperature requirements of water vaporization and steam overheating are met.