294results about "Steam use" patented technology

The embodiment of the invention provides a thermal power plant waste heat gradient utilization management method and system, belongs to the field of energy and power engineering, and aims at solving the problems that in the prior art, waste heat gradient matching is unreasonable, the low-temperature waste heat recovery efficiency is low, and the system integration degree is insufficient. The method comprises the following steps: constructing a multi-physics field coupling digital twinborn model and performing real-time correction; establishing a dynamic matching matrix of the residual heat source and the heat consumption load based on balance analysis; solving a Pareto optimal operation scheme through a multi-objective optimization model; and generating and issuing a cooperative control instruction. The system comprises a panoramic data sensing module, a digital twin modeling module, a balance and optimization decision module and a cooperative control instruction generation module. Through global optimization and dynamic regulation and control, the waste heat utilization efficiency, the economical efficiency and the equipment reliability are remarkably improved.

The utility model relates to the technical field of waste heat utilization of centrifugal air compressors, in particular to a tar residue treatment system. The centrifugal air compressor is provided with N stages of compressors, N is larger than or equal to 2, and the N stages of compressors are connected with the N-1 efficient heat exchangers in series through pipelines. An outlet of the high-efficiency heat exchanger is connected with an inlet pipeline of the organic working medium-hot water heat exchanger, an outlet of the organic working medium-hot water heat exchanger is connected with an inlet pipeline of the high-efficiency heat exchanger to form a circulating water system, and the water replenishing pipeline is connected with the circulating water system; an outlet of the organic working medium-hot water heat exchanger is connected with an inlet pipeline of a working medium expansion machine, an outlet of the working medium expansion machine is connected with an inlet pipeline of a working medium condenser, and an outlet of the working medium condenser is connected with an inlet pipeline of the organic working medium-hot water heat exchanger to form an organic working medium circulating system; the working medium expander is connected with a generator pipeline. The waste heat of the centrifugal air compressor can be effectively utilized, and the current situation of insufficient power supply of a factory can be relieved.

The invention belongs to the technical field of clean energy power generation and energy storage, and particularly relates to a multi-coupling liquid metal thermoelectric conversion system. The system comprises a liquid metal reactor module, a photo-thermal system module, a liquid metal energy storage module and an energy conversion module, the liquid metal reactor module is a core base load energy source of the system; the photo-thermal system module is used as peak regulation and supplementary energy; the liquid metal energy storage module serves as a shared energy storage unit of the nuclear energy and photo-thermal system. The problems that nuclear energy peak regulation flexibility is poor, photo-thermal power generation is intermittent, and a traditional molten salt system is limited in high-temperature performance and slow in response can be solved.

The utility model discloses a power plant waste heat comprehensive utilization system, and relates to the technical field of energy conservation and environmental protection. According to the technical key points, the system comprises a warm air blower connected with an indirect air cooling system, and the warm air blower is installed on the inlet side of a first induced draft fan; an air outlet of the first induced draft fan is connected with one end of the air side of the air preheater, and the other end of the air side of the air preheater is connected with the boiler; one end of the smoke side of the air preheater is connected with a flue at the tail of the boiler, and the other end of the smoke side of the air preheater is connected with an air inlet of the low-pressure economizer; a gas outlet of the low-pressure economizer is connected with the tail gas treatment module. According to the scheme, the exhaust steam waste heat of the steam turbine and the exhaust smoke waste heat of the boiler are comprehensively utilized at the same time, so that the two parts of waste heat are utilized to the greatest extent, the coal consumption of a power plant is reduced, and meanwhile, the heat pollution to the environment can be reduced.

The present application relates to the technical field of energy utilization, and particularly to a combined heat and power generation system capable of efficiently and flexibly heating by means of dual-unit combined supply, comprising a high backpressure unit and a conventional unit, and further comprising a first-stage heating unit, a second-stage heating unit, a third-stage heating unit, and a fourth-stage heating unit. In the present application, four stages of different heating units are provided and are simultaneously communicated with a conventional backpressure unit and the high backpressure unit, and a low-pressure cylinder crossover pipe heating mode and a low-pressure cylinder zero-output heating mode are flexibly selected on the basis of the total steam consumption demand of the third-stage and fourth-stage heater in combination with the real-time electric load condition of the conventional backpressure unit, so that the heating load of the units can be adjusted more flexibly; and when an electric load is determined, the external heating loads of the conventional and high backpressure units can fluctuate between -50% and +50%, and a high thermal-electric decoupling capability is realized.

The invention provides a thermodynamic cycle system applied to a steam turbine. The thermodynamic cycle system comprises a boiler, the steam turbine and a vortex tube. The boiler generates steam with first temperature; the steam turbine discharges a first path of steam with second temperature to the vortex tube, a second path of steam with second temperature is discharged to the liquid inlet of the boiler, the vortex tube separates the first path of steam into hot steam with third temperature and cold steam with fourth temperature, and the hot steam with third temperature is recycled to the steam turbine; the steam turbine drives mechanical equipment through hot steam with the third temperature, cold steam with the fourth temperature is discharged to the liquid inlet of the boiler, the third temperature is higher than the second temperature, and the fourth temperature is lower than the second temperature; wherein the cold steam with the fourth temperature cools the second path of steam to generate cooling liquid, the cooling liquid enters the boiler from a liquid inlet of the boiler, the steam with the first temperature is generated after heating, a vacuum water ring pump and a condenser are omitted, and energy is saved.

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.

A heat utilization system includes: a heat recovery device configured to generate first steam and second steam with a lower pressure than the first steam from water by heat exchange between a heating fluid and the water; a discharge source which discharges the heating fluid; a first steam turbine driven by the first steam; a pressure reduction part configured to reduce pressure of exhaust steam which is steam that has driven the first steam turbine; a heat demand facility which utilizes heat of at least one of at least part of the exhaust steam or the second steam; an exhaust steam line connecting the first steam turbine and the heat demand facility; and a second steam line through which the second steam flows out of the heat recovery device. The second steam line is connected to the exhaust steam line at a position downstream of the pressure reduction part.

The invention relates to the technical field of intelligent management of power generation enterprises, in particular to an on-line cooperative heat supply control system and method of a cooperative network system.The cooperative network system is composed of a plurality of heat supply units and comprises a collecting part, a data processing part and a data processing part, heat supply data and environment temperature change data of each unit and power grid load change data of the collaborative network system are collected; and the control part is used for identifying the actual state of each unit based on the heat supply data, the environment temperature change data and the power grid load change data, forming an optimal combination scheme under various heat supply modes and peak regulation modes, generating an online cooperative heat supply control instruction and controlling each unit to work. Therefore, the problems that in the related technology, a peak regulation means only focuses on deep peak regulation, the unit tip peak capacity is weakened, an online cooperation scheme is lacked after multi-mode transformation, then the deep peak regulation and the high rated load output capacity need to be considered in flexible transformation of the heat supply unit, and it is difficult for a power generation enterprise to achieve economic benefit maximization through cooperation are solved.

The invention provides a method and a device for absorbing photovoltaic abandoned electricity by utilizing heat storage of a deaerator. According to the method, the photovoltaic power abandoning rate can be effectively reduced, local consumption of the photovoltaic super-generating capacity in the low-load period of the power plant is achieved, waste of clean energy is avoided, meanwhile, heat storage adjustment is achieved through transformation of an existing deaerator, the consumption cost is remarkably reduced, and the operation stability of the system is guaranteed.

The utility model relates to the technical field of steam extraction flow stabilizing equipment of steam turbines, and particularly discloses a power station industrial steam extraction small-flow adjusting device which comprises a steam extraction main pipe and an adjusting pipeline, the steam extraction main pipe is communicated with the adjusting pipeline, a sunken U-shaped pipe is arranged in the middle of the adjusting pipeline, and an automatic adjusting valve is installed on a bottom pipeline of the U-shaped pipe. A filter and a drain pipe are further installed on the U-shaped pipe, the filter is located in front of the automatic regulating valve, and the drain pipe is located behind the automatic regulating valve; the design of the U-shaped pipe is adopted, steam conveyed by a low-pressure steam pipe network is collected and climbs through the U-shaped pipe, pressure relief and drainage are conducted through timing opening of the drainage pipe, air in the pipeline is discharged, the arrangement pressure and flow in the pipeline are adjusted to be more stable, and the problems of adjustment oscillation and large pressure fluctuation are avoided; an automatic regulating valve is adopted for starting control at the bottom full pipe position, the flexible regulating capacity of an energy system is improved, the resource utilization rate is increased, and economic benefits are created for companies.

This invention discloses a rapid response system and method for coal-fired power plants based on thermochemical energy storage, applicable to the field of grid energy storage, including coal-fired power generation, carbon capture, energy storage, and power generation units. The coal-fired power generation unit includes a boiler, turbine, generator, and regenerative system; the carbon capture unit includes an absorption tower, separation tower, and reboiler; the energy storage unit includes a dry air pump, an air heater, and a thermochemical energy storage reactor. Steam extraction from the intermediate-pressure cylinder is connected to the air heater, and steam extraction from the low-pressure cylinder is connected to the reactor inlet. The reactor outlet steam is supplied to the reboiler and the organic Rankine cycle power generation unit. Waste heat recovery from the carbon capture unit cooler is used for preheating the organic working fluid, achieving cascaded energy utilization and rapid peak shaving. This invention constructs a two-way "energy storage-energy release" operation mechanism through the thermochemical energy storage unit, solving the problems of reduced output and slow response during peak shaving in carbon capture power plants, enabling more steam to be used for power generation, broadening the peak shaving range, and improving the response rate.

The invention discloses a system and method for improving the summer operation performance of a gas-steam combined cycle unit, and the system is characterized in that an expanded economizer is arranged in a waste heat boiler unit of the gas-steam combined cycle unit, and is connected with the generator side of an absorption heat pump unit through a waste heat water circulation pipeline; a waste heat water circulating pump is arranged in the waste heat water circulating pipeline; an air inlet cooling heat exchanger is arranged in an air compressor inlet pipeline of a gas turbine of the gas-steam combined cycle unit, the air inlet cooling heat exchanger is further connected with the evaporator side of the absorption heat pump unit through a chilled water circulation pipeline, and a chilled water circulation pump is arranged in the chilled water circulation pipeline. The condenser side of the absorption heat pump unit is connected with a heat supply network water pipeline, and a heat supply network water circulating pump is arranged in the heat supply network water pipeline. According to the scheme, the summer peak load capacity of the gas-steam combined cycle unit is improved, cascade efficient utilization of energy is achieved, the economical efficiency and the environmental protection property are improved, and collaborative cooling and heating are achieved.

The invention belongs to the technical field of heating, and particularly relates to a heat exchange system and method for power plant low-temperature waste heat recovery heating, and the system comprises a power plant, a lithium bromide absorption heat pump unit and a shell-and-tube steam-water heat exchanger; through the lithium bromide absorption heat pump unit, heat exchange is conducted on heating return water and power plant steam, low-temperature waste heat of a power plant is recycled, and the heating return water is heated; heating return water exchanges heat with steam of a power plant through a shell-and-tube steam-water heat exchanger, and the heating return water is heated; heating return water and power plant steam are subjected to heat exchange through the lithium bromide absorption heat pump unit, low-temperature waste heat of the power plant is recycled, the heating return water is heated, then the heating return water and the power plant steam are subjected to heat exchange through the shell-and-tube steam-water heat exchanger, and the heating return water is heated again. The heating reliability and flexibility can be effectively improved, and the utilization rate of heating equipment is increased.

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 relates to an evaporation pressure stabilizer for an organic Rankine cycle system, which comprises an evaporation cavity and a waste gas cavity, the evaporation cavity and the waste gas cavity are vertically arranged in a separated manner, the evaporation cavity is connected with a steam outlet, a pressure stabilizing system is arranged between the evaporation cavity and the steam outlet, and the evaporation cavity is filled with an organic working medium; the heat pipes are uniformly distributed in the evaporation pressure stabilizer, and each heat pipe comprises a condensation section located in the evaporation cavity and an evaporation section located in the waste gas cavity; the evaporation cavity, the waste gas cavity and the pressure stabilizing system are integrated, the structure is compact, the evaporation cavity, the waste gas cavity and the pressure stabilizing system are integrated, the evaporation cavity, the waste gas cavity and the pressure stabilizing system can be installed as a whole, the waste gas inlet is used for connecting high-temperature waste heat steam exhaust and fully utilizing waste heat, the number of the heat pipes is large, the heat pipes are evenly arranged, and heat absorption and heat release are conducted at the same time; the heat exchange efficiency is high, and the evaporation temperature can be flexibly controlled.

The invention provides an energy-saving natural gas liquefaction process system based on waste heat recovery, and belongs to the technical field of natural gas liquefaction, and the energy-saving natural gas liquefaction process system based on waste heat recovery comprises a cooling circulation system and a waste heat recovery system. And an efficient and closed-loop energy gradient utilization network is constructed. The system not only fully utilizes high-temperature waste gas discharged by the gas turbine to drive the steam turbine to generate power, but also further recovers medium-low-grade waste heat in exhaust gas of the steam turbine and heat generated in the compression process of a mixed refrigerant for pre-cooling raw material natural gas. According to the multi-stage and multi-source waste heat recovery mode, the energy consumption of a traditional pre-cooling link is remarkably reduced, the overall thermodynamic perfection degree of the system is improved, and efficient and low-carbon utilization of energy is achieved.

The invention relates to the technical field of power generation, and provides an ammonia gasification and preheating system of an ammonia-doped boiler, which comprises a liquid ammonia supply unit, an ammonia gasification unit and an ammonia preheating unit, the liquid ammonia supply unit is used for providing liquid ammonia and adjusting the pressure of the liquid ammonia; the ammonia gasification unit comprises an ammonia gasifier, an inlet of the ammonia gasifier is connected with an outlet of the liquid ammonia supply unit, and the ammonia gasifier is configured to gasify liquid ammonia into ammonia by taking dead steam of a steam turbine as a heat source and recover condensed water; the ammonia preheating unit comprises an air pre-heater and an ammonia pre-heater arranged behind the air pre-heater; the ammonia pre-heater is used for heating ammonia gas from the ammonia gasification unit by utilizing flue gas at an outlet of the air pre-heater; and the preheated ammonia gas is conveyed to a combustor of the boiler. According to the scheme, the using amount of circulating water of the condenser and water supplementing loss are reduced, the investment of the cooling tower is reduced, meanwhile, the combustion stability of ammonia entering the boiler is improved, and fuel consumption is reduced.

The application discloses a heat exchanger and boiler flue gas waste heat recycling equipment, which comprises a base plate, heat storage mechanisms and steam turbines are installed on the upper surface of the base plate, the heat storage mechanisms are connected with the steam turbines through pipelines, the heat storage mechanisms absorb the heat of flue gas to generate water vapor, the steam turbines are driven to operate by the water vapor, the base plate is provided with a reversing mechanism, the reversing mechanism is installed on the output end of the steam turbine, and the base plate is provided with crushing mechanisms and generators on the left and right sides of the upper surface. According to actual working conditions, the waste heat power generation and the waste heat driven crushing can be flexibly switched, the limitation of single function of the traditional waste heat recycling equipment is broken, the coal blocks are fully crushed into small particles, the fuel loss rate is effectively reduced, the conversion of the furnace ash and slag from solid waste to recyclable resources is realized, the land resources and disposal costs required for the storage or landfill of the furnace ash and slag are reduced, and the environmental occupation and pollution pressure of the solid waste are reduced.

The invention discloses a novel ship comprehensive energy system and method integrating organic Rankine cycle waste heat recovery, and belongs to the field of ship comprehensive energy design. The system comprises a dual-fuel engine, a dual-fuel generator set, a fuel cell, a waste heat boiler, a shaft-driven motor, a lithium battery, an electric refrigerator, a heat pump, an organic Rankine cycle, carbon capture equipment, a carbon trading mechanism, mechanical, electric, heat and cold load requirements in the ship operation process and other accessories. According to the system, by optimizing an energy structure (such as renewable energy storage) and a carbon capture means, the economical efficiency is improved, the double-control target of carbon emission is achieved, the compliance requirements of international maritime affair environmental protection laws and regulations are effectively supported, and green and sustainable development of ships is assisted.

The invention relates to the technical field of coupling of heat storage devices and thermal power generating units, and discloses a graphite-based ultrahigh-temperature cascade heat storage coupling system and a working method thereof.The coupling system comprises a water supply unit, a solid heat storage unit, a steam pocket, a modular phase change heat storage device, a steam turbine system and a power generator; the water supply unit, the solid heat storage unit, the steam pocket, the modularized phase change heat storage device and the steam turbine system are sequentially communicated through a circulating pipeline, a heat exchange medium passing through a water supply pump flows into the solid heat storage unit, and a high-parameter medium with the temperature of 560 DEG C or above flows out of a medium outlet of the modularized phase change heat storage device. By means of the modularized heat storage device structure for direct contact heat exchange, heat storage materials and heat exchange pipes of all the modules are arranged in a layered mode, flow control is conducted in a layered mode, and stable control over the gas production temperature of the device is achieved.

The utility model discloses a reheating cold section pipeline behind a high-pressure bypass valve, and relates to the technical field of thermal power plant steam pipelines. The device is characterized by comprising a first pipeline, one end of the first pipeline is connected with an outlet of a high-pressure bypass valve, the other end of the first pipeline is connected with one end of a second pipeline, an included angle is formed between the second pipeline and the first pipeline, and the other end of the second pipeline is connected with a reheater through a third pipeline; the first pipeline, the second pipeline and the third pipeline are alloy pipelines; the height of the connecting point of the second pipeline and the first pipeline in the vertical direction is larger than that of the connecting point of the second pipeline and the third pipeline in the vertical direction. According to the reheating cold section pipeline, the alloy pipeline with the higher physical and chemical performance is designed in a segmented mode, and even if the high-pressure bypass valve leaks inwards due to scouring or the slag inclusion phenomenon of the valve seat, the reheating cold section pipeline can still run for a long time in a scouring-resistant and over-temperature mode, so that safe and stable running of a unit is effectively guaranteed.

The invention discloses a coal-fired power plant quick response system and method based on thermochemical energy storage, which are applied to the field of power grid energy storage and comprise a coal-fired power generation unit, a carbon capture unit, an energy storage unit and a power generation unit. The coal-fired power generation unit comprises a boiler, a steam turbine, a power generator and a regenerative system; the carbon capture unit comprises an absorption tower, a separation tower and a reboiler; the energy storage unit comprises a dry air pump, an air heater and a thermochemical energy storage reactor. The medium-pressure cylinder is connected with the air heater through steam extraction, the low-pressure cylinder is connected with the inlet of the reactor through steam extraction, and steam at the outlet of the reactor is supplied to the reboiler and the organic Rankine cycle power generation unit. Waste heat of a cooler of the carbon capture unit is recycled and used for preheating organic working media, and energy gradient utilization and rapid peak regulation are achieved. According to the invention, an energy storage-energy release bidirectional operation mechanism is constructed through the thermochemical energy storage unit, the problems of output reduction and slow response during peak regulation of the carbon capture power plant are solved, more steam is used for power generation, the peak regulation range is widened, and the response rate is improved.

A method and apparatus for recovering cold energy from a cold energy co-production generator set, the apparatus for recovering cold energy (20) being located between: a cold energy co-production generator set (21) comprising a cryogenic liquid source (24), at least one main heat exchanger (26, 32), and at least one secondary heat exchanger (26, 32); each main heat exchanger delivers a gas of the pressurized first fluid to at least one turbine (29, 36) associated with a generator (30, 37); and a cold energy consuming unit (22, 23) using a third fluid as a heat transfer fluid; the arrangement comprises: at least one thermal energy storage tank (60, 61, 62) storing cold energy carried by a second fluid through a circuit of conduits (65, 67, 69) in a closed loop when the generator set is powered, the closed loop passing through at least one main heat exchanger (26, 32) of the generator set and comprising at least one pump (63, 64); and at least one secondary heat exchanger (70) disposed between the cold energy consuming unit and a piping circuit through which a second fluid flows, the secondary heat exchanger supplying cold energy to the cold energy consuming unit when the generator set stops supplying power and a pump (64) of the piping circuit is simultaneously drawing cold energy from at least one storage tank.

The invention provides a steam heat storage system of a coupling coal power unit and a capacity determination method, and belongs to the technical field of coupling heat storage systems of coal power units. The coal power unit in the steam heat storage system coupled with the coal power unit comprises a boiler and a steam turbine unit; the coal power unit further comprises a regenerative system. The inlet end of the regenerative system is connected with the outlet end of the turboset, and the outlet end of the regenerative system is connected with the inlet end of the boiler. A steam-water mixing heater, a low-temperature water storage tank and a high-temperature water storage tank are arranged in the steam heat storage system of the coupling coal power unit. A steam inlet of the steam-water mixing heater is connected with the turboset, a water inlet of the steam-water mixing heater is connected with an outlet of the low-temperature water storage tank, and a water outlet of the steam-water mixing heater is connected with an inlet of the high-temperature water storage tank. An inlet of the low-temperature water storage tank and an outlet of the high-temperature water storage tank are both connected with a condensed water outlet of the heat regeneration system. The problem that potential safety hazards exist due to the fact that the deep peak regulation capacity is insufficient in the prior art is solved.

The invention discloses an electricity-heat-hydrogen comprehensive energy system based on thermochemical energy storage, which is characterized in that an outlet of a thermodynamic cycle system is communicated with an inlet of a steam turbine, a steam extraction opening of the steam turbine is communicated with a shell side inlet of a thermochemical reactor, a shell side outlet of the thermochemical reactor is communicated with an inlet of a solid oxide electrolytic tank, and a shell side outlet of the solid oxide electrolytic tank is communicated with a shell side outlet of the steam turbine; a hydrogen outlet of the solid oxide electrolytic tank is communicated with an inlet of the hydrogen storage tank, an oxygen outlet of the solid oxide electrolytic tank is communicated with an inlet of the oxygen storage tank, an outlet of the hydrogen storage tank is communicated with an inlet of the combustion chamber, an outlet of the oxygen storage tank is communicated with an inlet of the combustion chamber, and an outlet of the combustion chamber is communicated with an inlet of the steam turbine. By means of the system, a unit can better absorb new energy for power generation, and stable operation of a power grid is kept.

The invention discloses a fused salt coupling heat storage and release system and method integrated to a thermal power generating unit, the thermal power generating unit comprises a boiler and a steam turbine, and the system comprises a fused salt heat storage subsystem configured to absorb and store sensible heat of main steam and reheat steam of the boiler when the unit stores heat; the water storage tank heat storage subsystem is configured to absorb and store latent heat of reheated steam when the unit stores heat; and the heat source side of the steam generation subsystem is connected to the fused salt heat storage subsystem, and the steam generation subsystem is configured to generate steam through heat stored by fused salt and convey the steam to an inlet of the steam turbine intermediate pressure cylinder when the unit releases heat so as to improve the power of the unit. The molten salt is used for storing sensible heat of main steam and hot reheat steam, the water storage tank is used for storing latent heat of reheat steam, cascade heat storage is achieved, steam-water working media circulate in the boiler and the heat storage system in the heat storage process and are prevented from entering a steam turbine condenser, cold end loss is reduced, and heat storage efficiency is improved.

The invention discloses a multi-steam-source undisturbed switching system for heat supply of a large coal power unit coupled with a small back pressure turbine, which comprises the small back pressure turbine, and further comprises a high-pressure steam source, a high-pressure steam source switching valve, a high-pressure steam source switching valve, a high-pressure steam source switching valve and a high-pressure steam source switching valve, the reheat steam source is sequentially connected with a medium-pressure steam source shut-off valve and a medium-pressure steam source check valve and then is connected to an inlet of the small back pressure turbine; according to the energy gradient utilization system, energy gradient utilization of heat supply of the large coal-fired unit coupled with steam extraction of the small back pressure turbine is achieved, the energy utilization efficiency is improved, it can be guaranteed that the small back pressure turbine operates under the full-load working condition, and therefore the operation safety of the small back pressure turbine is guaranteed.

This invention relates to the field of biomass treatment technology, and particularly to a waste resource recycling and drying system and method based on biomass combined heat and power (CHP). The waste resource recycling and drying system includes a combustion furnace, a steam generator, a pressure-stabilized air supply unit, and a biomass drying unit connected in sequence by pipes. The biomass drying unit includes a body with a high-temperature drying zone and a low-temperature drying zone arranged from top to bottom. Both the high-temperature and low-temperature drying zones are connected to the pressure-stabilized air supply unit. The high-temperature drying zone is connected to an exhaust device, and a heat exchange device is provided between the low-temperature drying zone and the exhaust device. This invention forms an integrated system of CHP and drying functions through the combustion furnace, steam generator, pressure-stabilized air supply unit, and biomass drying unit, ensuring stable and reliable drying quality of the output material. This constructs a complete closed loop from waste to energy conversion to energy feedback for waste treatment, achieving reduced energy consumption and improved energy efficiency.

The invention relates to a method and a system for increasing the water temperature of a boiler, which solve the problem that no steam source can be used for a third high-pressure heater when a third steam turbine generator unit is in low load or stops running through a steam source pipeline provided with a first connecting pipeline, ensure the continuous and stable operation of the third high-pressure heater, and improve the water temperature of the boiler. It is ensured that the water temperature of the third boiler is maintained at a design value of 150 DEG C, and the adverse effect of low-temperature water on safe and economical operation of a unit is avoided; surplus exhaust steam of the second steam turbine generator unit is fully utilized as a supplementary steam source, extra energy consumption is not needed, and the overall energy consumption of the unit is reduced; meanwhile, the heat exchange efficiency of the third high-pressure heater is guaranteed, the steam production cost of the third boiler is further reduced, the operation benefits of a thermal power plant are improved, and the economical efficiency is excellent.