40 results about "Feedwater heater" patented technology

The application discloses a generator set shared peak regulation system and a working method thereof. The system comprises a steam generator, a steam power generation device, a heat recovery device, a generator, an energy storage switch, a water taking shutoff valve, a backwater regulating valve, a molten salt cold tank, a cold molten salt pump, a molten salt electric heater, a hot molten salt tank, a hot molten salt pump, a feedwater heater inlet shutoff valve, a feedwater heater, a feedwater heater outlet shutoff valve, a heat network water heater inlet shutoff valve, a heat network water heater, a heat network water heater outlet regulating valve and a heat network water taking shutoff valve. The application realizes the peak regulation of two or more generators by one peak regulation system, is a shared energy storage system, uses a heat storage medium such as molten salt to realize large-capacity, long-time and high-quality energy storage, realizes the deep peak regulation of the unit, and the heat energy has diversified uses. The application can realize the flexible transformation of the whole plant through single investment, and has high equipment utilization.

A nuclear power plant comprising at least one nuclear reactor having a steam generator, a steam cycle including the steam generator, a first turbine fluidly coupled to the steam generator, a first condenser fluidly coupled to the first turbine, and a feedwater heater fluidly coupled to the first condenser and the steam generator, an intermediate thermal loop including the first condenser, and an evaporator, and an organic cycle including the evaporator, a second turbine fluidly coupled to the evaporator, a second condenser fluidly coupled to the second turbine, and a heat exchanger fluidly coupled to the second condenser and the evaporator.

The invention belongs to the field of energy storage, and particularly relates to an energy storage system and method based on a silicon-based ultrahigh-temperature phase change heat storage coupling gas turbine. The system comprises a silicon-based ultra-high-temperature heat storage device, an outlet of the silicon-based ultra-high-temperature heat storage device is connected with an ultra-high-temperature heat recovery device, an outlet of the ultra-high-temperature heat recovery device is connected with a circulating fan and a combustion chamber, and the circulating fan is connected with an inlet of the silicon-based ultra-high-temperature heat storage device; an outlet of the combustion chamber is connected with a gas turbine, the gas turbine is connected with a gas compressor, and the gas compressor is connected with an inlet of the ultra-high-temperature heat recovery device; an outlet of the gas turbine is connected with a waste heat boiler, and an outlet of the waste heat boiler is connected with a feed water heater and a steam turbine. The ultrahigh-temperature phase-change heat storage device with the silicon-based phase-change material as the heat storage medium is adopted, electric energy is converted into high-grade heat energy to be stored, and the efficient electricity-heat-electricity energy storage round-trip efficiency can be achieved and can reach 60% through an existing gas-steam combined cycle unit. If combined heat and power generation is considered, the energy storage efficiency can reach 85%.

The present invention provides a method for controlling the reactivity of a boric acid-free reactor in a secondary system of a pressurized light-water reactor, wherein: a turbine and a main water feeding system of a pressurized light-water reactor comprise a steam generator (S / G), a high-pressure turbine, a low-pressure turbine, a high-pressure feedwater heater, and a low-pressure feedwater heater; the high pressure turbine is provided with extracted steam ① and ② capable of heating feedwater, the low pressure turbine is provided with extracted steam ③ and ④ capable of heating feedwater, the high-pressure feedwater heater is provided with high pressure heaters ① and ② for receiving extracted steam from the turbines to heat feedwater, and a low-pressure feedwater heater is provided with low pressure heaters ③ and ④ for receiving extracted steam from the turbines to heat feedwater; and when operated with constant reactivity and temperature set as default values, the high-pressure heater ① receives extracted steam ② of the high-pressure turbine to heat feedwater, the high-pressure heater ② receives extracted steam ① of the high-pressure turbine to heat feedwater, the low-pressure heater ③ receives extracted steam ④ of the low-pressure turbine to heat feedwater, and the low-pressure heater ④ receives extracted steam from the low-pressure turbine ③ to heat feedwater.

The invention discloses a biomass afterburning tower-type photo-thermal power generation system and an operation method, and belongs to the technical field of photo-thermal power generation. The biomass afterburning tower-type photo-thermal power generation system comprises a molten salt loop, a water loop and an afterburning loop; the afterburning loop comprises a biomass afterburning system, a fused salt heater, a superheated steam heater, a reheated steam heater and a feed water heater; high-temperature flue gas formed in the biomass afterburning system exchanges heat with fused salt in the fused salt loop and superheated steam and reheated steam in the water loop through the fused salt heater, the superheated steam heater and the reheated steam heater to form medium-temperature flue gas. And the medium-temperature flue gas exchanges heat with feed water through a feed water heater to form low-temperature flue gas which is used for improving the quality of biomass. The system is suitable for a tower type system with high weather fluctuation sensitivity, fused salt in the fused salt loop and superheated steam and reheated steam in the water loop are heated through heat generated in the afterburning loop, and therefore the heat storage amount in the high-temperature fused salt tank is guaranteed, the efficiency of a steam turbine is improved, and energy waste and pollutant emission are reduced.

The application is suitable for supercritical technical field, and provides a primary frequency modulation control method, which comprises the following steps: designing a low-pass high filter and a high-pass low filter, decomposing a frequency signal, and obtaining low-frequency components and high-frequency components of the frequency signal respectively; sending the low-frequency components into a condensate water flow bypass valve controller, adjusting the bypass valve opening degree according to the low-frequency components; sending the low-frequency components into a low-level feedwater heater water level adjustment logic as a feedforward signal, and pre-judging and adjusting the low-level feedwater heater water level; sending the high-frequency components into a feedwater flow bypass valve controller, and adjusting the feedwater bypass valve opening degree according to the high-frequency components; and sending the high-frequency components into a high-level feedwater heater water level adjustment logic as a feedforward signal, and pre-judging and adjusting the high-level feedwater heater water level. By adjusting the water quantity on the high-level feedwater heater side, the steam side extraction quantity is changed, the temperature change is stable, and the stable operation of the unit is beneficial; the primary frequency modulation of the power grid is provided with an effective auxiliary means, and the frequency modulation precision and the frequency modulation response speed are improved.

The utility model discloses a kind of anticorrosion devices of low pressure feedwater heater drainage system under different working conditions, including automatic oxygenation system, automatic ethanolamine system, monitoring system and control system;Automatic oxygenation system includes compressed air storage tank, oxygenation electric cut-off valve and low pressure heater;Compressed air storage tank is connected with oxygenation electric cut-off valve, oxygenation electric cut-off valve is connected with low pressure heater;Automatic ethanolamine system includes ethanolamine solution tank and dosing pump electric cut-off valve;Ethanolamine solution tank is connected with dosing pump electric cut-off valve, dosing pump electric cut-off valve is connected with low pressure heater;Low pressure heater is connected with monitoring system, monitoring system is connected with control system, oxygenation electric cut-off valve and dosing pump electric cut-off valve are connected with control system.The utility model can monitor low pressure feedwater heater drainage system water vapor quality in real time.Realize AVT (O) and OT two kinds of operating condition Full coverage anticorrosion requirement, accurate, real-time feedback low pressure feedwater heater drainage water vapor quality, through ammonia oxygen collaborative device dynamic optimization oxygenation and ethanolamine addition amount Realize intelligent collaborative anticorrosion control.

The application discloses a waste heat utilization system and relates to the technical field of sewage treatment. The waste heat utilization system comprises a low-temperature multi-effect distillation device, a flue gas heat exchanger, a first flash tank, a second flash tank and a make-up water heater. The low-temperature multi-effect distillation device is provided with sewage inlets. The cold source inlet of the flue gas heat exchanger is communicated with the product water outlet of the low-temperature multi-effect distillation device. The water inlet of the first flash tank is communicated with the cold source outlet of the flue gas heat exchanger. The steam outlet of the first flash tank is communicated with the steam inlet of the first effect body. The water inlet of the second flash tank is communicated with the condensate water outlet of the first effect body. The heat source inlet of the make-up water heater is communicated with the steam outlet of the second flash tank. The cold source outlet of the make-up water heater is communicated with the make-up water inlet of at least one evaporation effect body. The waste heat utilization system realizes the step-by-step utilization of heat energy, greatly improves the overall thermal efficiency, reduces the energy consumption and cost of unit water production and solves the problem of energy consumption of high-temperature condensate water cooling.

This invention provides a thermal power generation system coupled with a supercritical carbon dioxide cycle, comprising: a thermal power unit, which includes a boiler, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a low-pressure feedwater heater group, a deaerator, and a high-pressure feedwater heater group connected in sequence to form a steam circulation loop; the extraction steam output end of the low-pressure cylinder is connected to the low-pressure feedwater heater group, and the extraction steam output ends of the intermediate-pressure cylinder and the high-pressure cylinder are respectively connected to the high-pressure feedwater heater group; a supercritical carbon dioxide subsystem, which includes a low-pressure cooler group, a first compressor, a high-pressure heater group, and a first turbine connected in series to form a working fluid circulation loop; the feedwater of the low-pressure feedwater heater group flows through the cold side of the low-pressure cooler group; the extraction steam output end of the intermediate-pressure cylinder, the hot side of the high-pressure heater group, and the hot side of the high-pressure feedwater heater group are connected in sequence, and / or, the extraction steam output end of the high-pressure cylinder, the hot side of the high-pressure heater group, and the hot side of the high-pressure feedwater heater group are connected in sequence.

The invention provides a nuclear power unit loop high-pressure water supply system and a flushing method thereof.The nuclear power unit loop high-pressure water supply system comprises a high-pressure water supply heater system, a steam generator main water supply system, a start and stop water supply system and a pipe assembly, and the pipe assembly comprises at least one first inlet and at least one first outlet; at least the outlet of the steam generator main water supply system is communicated with the first inlet, and the first outlet is used for being communicated with a conventional island waste liquid collecting system of the nuclear power unit, so that a flushing medium flowing out of the nuclear power unit loop high-pressure water supply system can flow into the conventional island waste liquid collecting system; the tube assembly is a permanent tube assembly. Impurities generated by flushing the high-pressure water supply system of the nuclear power unit loop can be discharged into a conventional island waste liquid collecting system through the pipe assembly and do not circularly flow in the high-pressure water supply system of the nuclear power unit loop, so that the probability that the impurities block a filter screen of equipment can be reduced.

The invention provides a nuclear energy steam supply system based on a heat pipe reactor, the nuclear energy steam supply system comprises a first transportation mechanism, a second transportation mechanism and a third transportation mechanism, the first transportation mechanism is provided with a reactor, an evaporator and a superheater, and the evaporator and the superheater are respectively connected with one reactor; a steam conversion system is arranged on the second conveying mechanism, and a feed water pump and a feed water heater are arranged on the third conveying mechanism; the first pipeline sequentially flows through the evaporator, the superheater, the steam conversion system, the feed water heater and the feed water pump to return to the evaporator; the second pipeline flows through the steam conversion system and is used for exchanging heat with the first pipeline to generate steam for a user side to use. Compared with a traditional reactor, the steam supply system disclosed by the invention can be moved to a user side, so that the steam transportation path is greatly shortened, and the steam quantity and the temperature loss can be greatly reduced.

The present invention discloses a steam-electric coupled molten salt heat storage and peak-shaving system for a thermal power unit and its operating method. The system includes a boiler, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a condenser, a condensing pump, a low-pressure heating unit, a feedwater pump, a high-pressure heating unit, a generator, a molten salt cold tank, a low-temperature molten salt pump, a steam cooler, a bypass regulating valve, a molten salt electric heater, a molten salt hot tank, a high-temperature molten salt pump, and a feedwater heater. The present invention reduces the amount of electricity consumed by the unit through steam extraction and electricity consumption. It can store heat in large capacity, for a long time, and at low cost, achieving deep peak-shaving of the unit. At the same time, the stored heat energy heats the boiler feedwater, reducing high-pressure steam extraction and reducing the unit's heat consumption, thus achieving good economic benefits.

The invention belongs to the technical field of energy storage systems, and particularly relates to an efficient zero-carbon gas turbine energy storage system and a using method. The system comprises a silicon-based ultrahigh-temperature heat storage device; an outlet of the silicon-based ultrahigh-temperature heat storage device is connected with a combustion chamber, and an inlet is connected with a gas compressor; an outlet of the combustion chamber is connected with a gas turbine, an outlet of the gas turbine is connected with a waste heat boiler, an outlet of the waste heat boiler is connected with a steam turbine and a feed water heater, an outlet of the steam turbine is connected with a condenser and a magnesium-based solid hydrogen storage device, and an outlet of the magnesium-based solid hydrogen storage device is connected with the combustion chamber and the steam turbine. And the other inlet of the magnesium-based solid hydrogen storage device is connected with an electrolytic hydrogen production device. The silicon-based ultrahigh-temperature heat storage device and the magnesium-based solid hydrogen storage device are combined, abandoned electricity or valley electricity is converted into high-grade heat energy and hydrogen energy, then the efficient zero-carbon energy storage function is achieved through gas-steam combined cycle thermoelectric conversion, and the electricity-electricity energy storage round-trip efficiency can reach 60%.

The invention provides a nuclear power unit loop low-pressure water supply system and a flushing method thereof.The nuclear power unit loop low-pressure water supply system comprises a condensed water extraction system, a low-pressure water supply heater system, a water supply deaerator system and a first pipe assembly, a first outlet of the first pipe assembly is used for being communicated with a conventional island waste liquid collecting system of a nuclear power unit, and at least the water supply deaerator system is communicated with the first pipe assembly through a first inlet. The first pipe assembly is used for enabling flushing media flowing out of the condensed water extraction system, the low-pressure feed water heater system and the feed water deaerator system to flow into the conventional island waste liquid collection system through the first pipe assembly; the first tube assembly is a permanent tube assembly. Impurities generated in the flushing process of the condensed water extraction system, the low-pressure feed water heater system and the feed water deaerator system can be discharged into the conventional island waste liquid collection system through the first pipe assembly, the impurities do not circularly flow in the low-pressure feed water system of the nuclear power unit loop, and the probability that the impurities block an equipment filter screen can be reduced.

This invention provides a heating system and control method for a high-temperature gas-cooled reactor (HTGR) nuclear power plant. The HTGR heating system includes: a HTGR nuclear island, a turbine generator set, a steam generator, a primary superheater, a secondary superheater, a heating mains, a user end, a feedwater preheater, a feedwater inlet, a deaerator, a feedwater heater, a feedwater pump, and a condenser. This invention fully utilizes the main steam from the HTGR nuclear island and the extracted steam from the turbine generator set as the heating steam source for the primary and secondary superheaters of the external heating system, producing externally supplied heating steam. Based on the operating status of the HTGR nuclear island, the heating system is controlled to adopt different operating modes, thereby achieving coordinated operation of power generation and heating. This provides high flexibility, high reliability, and good safety, and helps alleviate the pressure of carbon emissions from industrial heat consumption.

The present invention relates to the field of power generation technology, and specifically to a power generation system utilizing flue gas compression energy storage, comprising: a boiler, a steam turbine, a condenser, and a feedwater heater connected in sequence; the steam inlet of the feedwater heater is connected to the steam extraction end of the steam turbine; the flue gas compressor is connected to the flue gas outlet of the boiler and is electrically connected to a generator; the air inlet of a heat storage tank is connected to the flue gas compressor, the water inlet of the heat storage tank is connected to the water outlet of the condenser, and the water outlet of the heat storage tank is connected to the water inlet of the feedwater heater; a heat exchange structure and a heat storage medium are provided in the heat storage tank. The heat storage tank utilizes the flue gas compressed and transported by the flue gas compressor to heat the heat storage medium; and heats the condenser outlet water through the heat exchange structure and transports it to the water inlet of the feedwater heater; the present application utilizes flue gas compression to store heat and energy, utilizes the flue gas compressor to consume the electrical energy of the generator, and the heat storage medium absorbs and stores the heat of the flue gas compression; reduces boiler exhaust loss, improves boiler thermal efficiency, expands the load variation range, and increases the load variation rate.

The invention belongs to the cross technical field of a nuclear fusion energy technology and a heat-work conversion system, and provides a nuclear fusion Rankine cycle structure integrating divertor heat recovery, which comprises a primary side heat collection module and a secondary side heat-work conversion module, the heat-power conversion module comprises a steam generator, a first valve, a high-pressure turbine, a dehumidifier, a reheater, a low-pressure turbine, a condenser, a first water pump, a first feed water heater, a second feed water heater, a deaerator, a second water pump, a third feed water heater and a preheating heat exchanger which are sequentially connected through pipelines; the preheating heat exchanger preheats secondary side supplied water before entering the steam generator through heat of the divertor. And the outlet water temperature of the third feed water heater is matched with the temperature of the preheating heat exchanger by adjusting the inlet steam extraction flow of the third feed water heater. According to the structure, gradient utilization of nuclear fusion heat is achieved, and irreversible loss in the heat exchange process is reduced.

To provide a control system of nuclear power plant capable of precisely controlling the target water supply temperature, a control method of nuclear power plant, and a nuclear power plant.SOLUTION: The control system of a nuclear power plant controls a nuclear power plant including: a nuclear reactor; a condenser that converts steam generated in the nuclear reactor back into water: a feedwater heater that heats the water returned by the condenser; and a piping located downstream of the condenser and upstream of the feedwater heater or a drain pump that returns drain water from the feedwater heater to the equipment. The control system also includes: a feedwater temperature control unit that controls the feedwater temperature of the feedwater heater; and a target water supply temperature setting unit that outputs a water supply temperature command value. The feedwater temperature control unit controls the pump output of the drain pump based on the water supply temperature command value and the water supply temperature measurement value.SELECTED DRAWING: Figure 1

The present invention relates to a pneumatic controller with an improved calibration method and reduced influence from external temperature, the controller constantly maintaining the pressure of a reset bellows so that the balance of the pneumatic controller can be maintained despite temperature changes. The present invention provides the pneumatic controller with an improved calibration method and reduced influence from external temperature, the controller calibrating a bellows-based pneumatic controller that includes a proportional bellows and a reset bellows provided to a water level control system of a feedwater heater of a nuclear power plant, and then performing proportional control and closing with a reset valve so as to maintain the pressure of the reset bellows, and comprising: a pressure regulator capable of regulating the pressure between the reset valve and the reset bellows; a pressure indicator capable of monitoring the pressure of the pressure regulator; and a flow rate control valve for constantly maintaining the pressure of the reset bellows by regulating the rate of flow supplied from the pressure regulator.

The utility model relates to the technical field of acid-making heat energy recovery, in particular to a device for improving the high-pressure steam production rate of a sulfuric acid device. A flue gas outlet of the high-temperature absorption tower is connected with a flue gas inlet of the flue gas heater, a flue gas outlet of the flue gas heater is connected with a cold side inlet of the cold-hot heat exchanger, a hot side flue gas outlet of the cold-hot heat exchanger is connected with a flue gas inlet of the economizer, and a flue gas outlet of the economizer is connected with a flue gas inlet of the high-temperature absorption tower. A cold-side high-pressure feed water outlet of the economizer is connected with the high-pressure waste heat boiler, the high-pressure waste heat boiler generates high-pressure steam, and an acid-side inlet of the flue gas heater is connected with an acid-side outlet of the high-temperature absorption tower and / or an acid-side outlet of the low-pressure feed water heater. And an acid side outlet of the flue gas heater is connected with an acid side inlet of the low-pressure feed water heater and / or other process equipment. Compared with the prior art, the heat is transferred to the high-pressure steam system to increase the high-pressure steam yield while low-pressure steam output is guaranteed.

The utility model discloses a high-pressure feed water heater system, which relates to the technical field of high-pressure feed water of a thermal power plant, comprises a high-pressure feed water heater main body, and is characterized in that a steam inlet is arranged at the upper end of the high-pressure feed water heater main body, and a connecting pipe fitting is arranged at the upper end of the steam inlet; a steam pipeline is arranged at the end, away from the steam inlet, of the connecting pipe fitting, a deaerator is arranged at one end of the steam pipeline, one end of the deaerator is connected with a unit through a pipeline, the high-pressure feed water heater body comprises a ceramic outer shell, and an inner ceramic jacket is arranged in the ceramic outer shell. The problems that in an existing three-boiler two-machine non-standard operation scheme, the number of operation of high-pressure heaters is insufficient, water side operation of the high-pressure heaters of a shutdown unit is put into use, the feed water temperature is lowered, the economical efficiency of the unit is affected, and potential safety hazards are caused to boiler wall temperature adjustment and denitration system operation are solved.

This invention discloses an energy recovery system and method suitable for low-load wet operation of an ultra-supercritical boiler, comprising: a water storage tank, an atmospheric expansion tank, a heat accumulator, a thermal oil storage tank, a feedwater heater, a steam-water separator, a feedwater pump, a deaerator, and an ultra-supercritical boiler. The ultra-supercritical boiler and the water storage tank form a loop. The water storage tank is also connected to the atmospheric expansion tank and a condensate tank in sequence via pipelines. A branch pipeline between the water storage tank and the atmospheric expansion tank is connected to the heat accumulator. The heat accumulator, the thermal oil storage tank, and the feedwater heater form a loop on their heat source sides. The inlet of the feedwater heater on its feedwater side is connected to the deaerator via the feedwater pump, and the outlet of the feedwater heater on its feedwater side is connected to the ultra-supercritical boiler via a high-pressure regenerative heater group. This energy recovery system and method can effectively recover heat from saturated condensate, improve the operating efficiency of the ultra-supercritical boiler, and improve the denitrification efficiency of the denitrification equipment under low load.

To provide a power plant having a large synergistic effect by combining a solid polymer type water electrolysis device, a steam turbine plant, and a gas turbine cycle by hydrogen / oxygen combustion.SOLUTION: A section on a feed water pipeline of a steam turbine plant corresponding to pressure and temperature conditions of a gas turbine and a solid polymer type water electrolysis device is selected, a feed water circulation path including the solid polymer type water electrolysis device and a feed water heater is provided, and heat generated by water electrolysis of the solid polymer type water electrolysis device is absorbed by the feed water heater and used for heating boiler feed water.SELECTED DRAWING: Figure 1

The present application relates to the technical field of water heater operation performance analysis, and provides a nuclear power water heater operation performance analysis method, which calculates the tube side state according to the tube side measuring point data of the water heater, calculates the shell side and the drain outlet pipeline state of the water heater, calculates the condensation zone heat exchange performance, including the condensation zone heat transfer efficiency and the condensation heat exchange coefficient, and calculates the extraction pipeline and the upper drain pipeline state. The present application can efficiently and accurately analyze the operation performance and interface thermodynamic state of the nuclear power plant water heater.

This utility model relates to the field of coal chemical technology, and more particularly to a steam self-balancing dual isothermal converter system. In the steam self-balancing dual isothermal converter system, the mixed gas pipeline of water-gas and steam is connected to the mixed gas inlet of a medium-temperature heat exchanger; the mixed gas outlet of the medium-temperature heat exchanger is connected to the upper inlet of the first-stage isothermal converter; the lower outlet of the first-stage isothermal converter is connected to the converter gas inlet of the medium-temperature heat exchanger; the converter gas outlet of the medium-temperature heat exchanger is connected to a quencher; the converter gas outlet of the quencher is connected to a second-stage isothermal converter; the lower outlet of the second-stage isothermal converter is connected to a medium-pressure boiler feedwater heater; the converter gas outlet of the medium-pressure boiler feedwater heater is connected to a low-pressure boiler feedwater heater; and the converter gas outlet of the low-pressure boiler feedwater heater is connected to a converter gas output pipeline. This utility model can increase boiler water temperature and increase steam production without the need for external steam addition.

The invention discloses a system for increasing the high-pressure steam yield in the sulfur acid making process and a using method, and relates to the technical field of sulfur acid making. The system comprises a low-temperature heat recovery tower, a low-pressure steam generation unit, a diluter, a high-pressure boiler feed water heater, a conversion system and a steam recycling unit; the heat source is low-pressure steam by-produced by the low-pressure steam generation unit and is used for heating combustion-supporting air entering the sulfur burning furnace and flue gas entering the conversion system; and the high-pressure steam generation equipment is connected with the sulfur burning furnace and is used for receiving high-pressure boiler feed water preheated by the high-pressure boiler feed water heater and the economizer of the conversion system and generating high-pressure saturated steam. And heat energy is wasted.

The present invention discloses a steam extraction thermal storage peak-shaving system for a thermal power unit based on molten salt heat storage and its operating method. The system comprises a boiler, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a condenser, a condensing pump, a low-pressure heating unit, a deaerator, a feedwater pump, a high-pressure heating unit, a molten salt cold tank, a low-temperature molten salt pump, a steam cooler, a molten salt hot tank, a high-temperature molten salt pump, a feedwater heater, a steam condenser, and a heat network water heater. The present invention can systematically utilize molten salt to store steam heat, achieving large-capacity, high-quality heat storage. Furthermore, the system can achieve zero output of the low-pressure cylinder, significantly reducing the power output of the thermal power unit, significantly improving the unit's flexibility, and achieving deep peak-shaving of the thermal power unit, with good economic benefits.

The utility model relates to a coal power unit. Coal power unit, include: boiler, heat circulation system, back pressure machine and feedwater heater, the steam output end of boiler is connected with the steam input end of back pressure machine and the steam input end of heat circulation system respectively, the steam output end of back pressure machine is connected with the steam input end of feedwater heater, to steam output to feedwater heater, the feedwater output end of heat circulation system is connected with the feedwater input end of feedwater heater, to feedwater output to feedwater heater, the feedwater output end of feedwater heater is connected with the feedwater end of boiler, to steam heated after the feedwater output to boiler. Adopt the utility model can reduce coal power unit coal consumption.

The present application relates to waste heat recovery technical field, specifically to a kind of sulphating chemical low-temperature recovery section waste heat recovery device, including the concentrated sulfuric acid of evaporative feedwater heater for conveying the sulfuric acid one inlet pipe, and the concentrated sulfuric acid temperature is 140 ℃-190 ℃, still including phase-change heat energy recovery device, its one side is provided with sulfuric acid import and sulfuric acid one inlet pipe intercommunication for 140 ℃-190 ℃ concentrated sulfuric acid enters, and its one side is provided with the sulfuric acid outlet for the concentrated sulfuric acid of temperature 100 ℃-150 ℃ after heat exchange and discharges;Deaerated water inlet pipe, it is used to transport temperature 90 ℃-110 ℃ deaerated water to phase-change heat energy recovery device and concentrated sulfuric acid heat exchange generates 0.1-0.2MPa steam, and phase-change heat energy recovery device top is connected with the main steam discharge port for discharging steam;Desalted water heat exchanger, it is used to carry out secondary waste heat recovery to concentrated sulfuric acid after phase-change heat energy recovery device processing, and finally concentrated sulfuric acid is cooled to 40 ℃-90 ℃.This process makes full use of the waste heat of concentrated sulfuric acid, further improves the energy recovery utilization rate.

The invention discloses a steam turbine shaft seal system capable of reducing condenser load, which relates to the technical field of steam turbine shaft seal and comprises a condensed water heater, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a feed water heater, an auxiliary steam header and a water pump steam turbine, and the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder are sequentially arranged. The structure is reasonable, when the steam exhaust amount of the high-pressure cylinder and the medium-pressure cylinder exceeds the steam supply amount needed by the low-pressure cylinder in the high-load stage, the shaft seal steam supply communication door is closed at the moment, steam behind an outlet of the shaft seal steam supply communication door serves as a heat source of the feed water heater through the steam supply pipeline of the feed water heater, cooling water of the feed water heater serves as water coming from an outlet of the deaerator, and the deaerator is used for deaerating. The steam temperature of an outlet of the feed water heater is adjusted to be about 150 DEG C by adjusting the opening degree of a water supply adjusting door, and steam is supplied to a turbine low-pressure cylinder shaft seal system and a feed pump turbine shaft seal system through pipelines at the same time. Therefore, the thermal load of the condenser is effectively reduced.