43results about How to "Achieve thermoelectric decoupling" patented technology

The invention provides a thermoelectricity decoupling transformation and operation method based on heat source end and heat network comprehensive adjustment, and the thermoelectricity decoupling is realized through transformation of a high-pressure bypass and low-pressure bypass, cylinder disengaging operation of a low-pressure cylinder, additional arrangement of an electric boiler and pipe network heat storage of a heat network. In order to ensure the heat supply capacity of a unit under the low load, the cylinder disengaging operation transformation of the low-pressure cylinder is carried out on the basis of an original steam extraction and heat supply mode to increase the heat supply capacity of the unit; meanwhile, by means of joint adjustment of an initial station and a secondary station, the defect that the heat supply capacity is insufficient under the low load is overcome through the heat storage of a primary pipe network under the high load; by means of the cylinder disengaging operation of the low-pressure cylinder and the heat storage of the primary pipe network, the problem that the heat supply amount under the low load is low during the whole heat supply period can be solved basically; the electric boiler is adopted during transformation so that the electric boiler can be used as the peak adjustment of the heat load when the heat storage function fails because of an extreme weather period and a long-time pipe network operation of the unit under the low load; and meanwhile, the high-pressure bypass and the low-pressure bypass are transformed to serve as a standby means for heat supply, so that the reliability of heat supply under the low load of the unit is further improved.

The invention relates to a thermoelectric decoupling and peak shaving system. The thermoelectric decoupling and peak shaving system comprises a thermal power plant heating-extracting heat supply network heating system and a heat supply network system. The thermoelectric decoupling and peak shaving system is characterized by further comprising an electric network and electric plant peak shaving control platform and a heat supply network heat storage and release operation and management platform and further comprising at least one of a circulating water waste-heat heat pump recycling system and an electric boiler heating system; and when the electric network and electric plant peak shaving control platform of the thermoelectric decoupling and peak shaving system gives out a peak shaving command, an electric plant converts electric energy into heat energy by starting an electric boiler and the circulating water heat pump and conveys the heat energy into a heat supply pipe network, and the heat supply network heat storage and release control platform is used for controlling the whole temperature increase of a primary pipe network and a secondary pipe network so as to achieve the purpose of pipe network heat storage. The wind abandoning and light abandoning peak shaving electric quantity is absorbed through the heat pump and the electric boiler, the complete thermoelectric decoupling can be achieved for the thermal power plant, the pure condensing operation depth peak shaving of the thermal power plant becomes possible, the thermal power plant can receive the subsidy through the depth peak shaving, and the heating safety can be guaranteed through the pipe network heat storage.

The invention relates to an electric peak load regulation gas-fired cogeneration waste heat recycling device and method. The device comprises a central urban area heat supply system and an external supply area heat supply system which are arranged in a power plant, and the two systems are each composed of a high-temperature heat storage tank, a low-temperature heat storage tank, a steam-water heatexchanger, a heat pump unit, a flue gas heat exchanger and accessories such as valves. The method comprises the steps that the running mode of the device is adjusted through different valve opening and closing combinations, and then the device runs in the electrical load off-peak period and in the electrical load peak period separately. According to the electric peak load regulation gas-fired cogeneration waste heat recycling device and method, thermoelectric decoupling of the gas-fired cogeneration power plant in winter is achieved, flue gas total heat is recycled on the condition that it isguaranteed that the heat supply capacity of an original heat supply network of the central urban area is invariable, the added heat is externally supplied to a newly-added heat supply area, and meanwhile the electric peak load regulation capability of the gas-fired power plant in winter is significantly improved to reduce a wind curtailment phenomenon. The heat supply network of the central urbanarea still runs according to an original heat supply mode, only a large-temperature-difference heat exchange unit of a tail-end heating station of the external supply area needs to be transformed ornewly constructed, and therefore the transforming or newly constructing cost is reduced.

The invention provides a waste heat recovery system for a coal-fired power plant. The waste heat recovery system involves a boiler, an air preheater, a plurality of coolers, a dust remover, a desulfurizing tower, a flue gas condensation heat exchanger, a flue gas reheater and a chimney which are sequentially arranged; the plurality of coolers are sequentially connected in series, the outlet temperatures of heat exchange media of the plurality of coolers are sequentially reduced, and the plurality of coolers correspond to different heat using devices; the system involves an absorption heat pump, a thermocline heat storage tank and a heat supply network, and the hot water output end of the thermocline heat storage tank communicates with the heat supply network; and heat generated by part ofthe coolers is used for driving the absorption heat pump to recover heat released in the flue gas condensation process, part of the heat generated by the heat pump is conveyed to the flue gas reheaterto be used for reheating flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in part of coolers and stored in the thermocline heat storage tankto supply heat loads needed by the heat supply network. Gradient utilization of energy is achieved, energy conservation, water recovery and thermoelectric decoupling can be achieved simultaneously, and the unit waste heat and water recovery capacity and the power station operation flexibility are improved.

The invention relates to a whole network distributed heat storage and supply system and method and belongs to the field of heat storage and supply systems. The whole network distributed heat storage and supply system is characterized by comprising a heat supply system, a heat storage system, a control system and a management and control platform, wherein the heat supply system is connected to theheat storage system, and the control system is separately connected to the heat supply system, the heat storage system and the management and control platform; the heat storage system includes a heatstorage tank, an electric shut-off valve, an electric regulating valve and a circulating water pump, wherein a cold water end and hot water end of the heat storage tank are separately connected to theheat supply system through the electric shut-off valve, the electric regulating valve and a circulating water pump. The whole network distributed heat storage and supply system and method have the advantages that novel heating systems of heat storage devices are installed on positions such as users' houses, heat exchange stations, pipe networks, renewable energy source areas, thermal power plantsand regional boiler rooms, and through the mode of combining user sides, pipe network sides and heat source sides for heat storage, not only are the needs of heat sources for peak shaving met, but also the advantages of being narrow in adjustment range, closer to the users, higher in flexibility and the like are achieved.

A comprehensive frequency modulation and peak regulation system of a coal-fired power plant comprises a heat accumulator, a heat accumulator cold water pipeline, a heat accumulator hot water pipeline,a condensate water return pipeline, a condenser, a steam turbine, a generator connected with the steam turbine, an electric heating conversion device connected with the generator through a power transmission line, a heat storage heater with one side connected with the electric heating conversion device and the other side connected with the heat accumulator cold water pipeline and the heat accumulator hot water pipeline through a heat storage pipeline, a heating network heater connected with the heat accumulator cold water pipeline and the heat accumulator hot water pipeline through a heat release pipeline, a condensate pump, a shaft seal heater with one end connected with the condensate pump and the other end connected with a condensed water supply pipe, a low-pressure heater, a deaerator, a water supply pump and a high-pressure heater. The system not only can meet the peak regulation requirement of the coal-fired power plant, but also can meet the frequency regulation requirement ofa large power grid, simultaneously can improve the utilization rate of existing heat accumulator equipment and obviously improves the flexibility of the coal-fired power plant. The system can be widely applied to flexible transformation of the coal-fired power plant.

The invention belongs to the technical field of combined heat and power generation, and discloses a heat supplying system of a fuel gas-steam combined circulation heat power plant. The system comprises three heat exchangers, and has three heat supplying modes connected in parallel; according to the first heat supplying mode, part of steam is introduced into one of the heat exchangers; according tothe second heat supplying mode, part of steam is introduced into the three heat exchangers in sequence; and according to the third heat supplying mode, all steam is introduced into the three heat exchangers in sequence. According to the heat supplying system of the fuel gas-steam combined circulation heat power plant, by adjusting steam inflow of a steam turbine of the fuel gas-steam combined circulation heat power plant, flexible switching of three heat supplying running modes is achieved, and therefore changing of heat supplying loads is achieved; and the problem that heat and electricity loads of the fuel gas-steam combined circulation heat power plant are not matched is effectively solved, and thermoelectric decoupling is achieved.

The invention relates to a thermoelectric decoupling system for a gas turbine cogeneration unit. The thermoelectric decoupling system comprises a molten salt storage and heat release system, a waste heat boiler, a chimney, a gas turbine, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a generator and a hot user. The thermoelectric decoupling system has the beneficial effects that molten salt is heated by using high-temperature flue gas after the gas turbine generates power so as to store heat, so that high energy consumption caused by a direct combustion boileris avoided, the consumption of natural gas is reduced, and the steam cost is reduced; compared with an existing peak regulation technique of a heat accumulating type electric boiler, the problem of high energy consumption caused by the change of high-quality power into steam is solved; and according to the thermoelectric decoupling system, the gas turbine and the waste heat boiler are not rebuilt, only one molten salt storage and heat release system is additionally arranged, so that the thermoelectric decoupling of the gas turbine cogeneration unit is realized, and the problem that the directcombustion steam boiler with high energy consumption is forced to adopt due to shutdown of the gas turbine is solved.

The invention discloses a virtual power plant thermoelectric combined economic dispatching method containing heat utilization comprehensive satisfaction. The method comprises the specific steps ofS1,enabling a cogeneration unit and a wind power plant to be aggregated into a thermal-electric virtual power plant, carrying out the demand response management of a thermal load, and introducing an excitation type thermal load demand response, S2, constructing a heat utilization comprehensive satisfaction model for weighted consideration of the heat utilization mode satisfaction and the heat utilization cost satisfaction, and constraining the heat load demand response through the model, and S3, constructing a virtual power plant thermoelectric combined economic dispatching model containing heatutilization comprehensive satisfaction by taking the maximum net income of the virtual power plant as a target function, and formulating a dispatching scheme according to the model. The method is simple in implementation process, can effectively promote wind power consumption by implementing the excitation type thermal load demand response on the basis of meeting the heat utilization of a user, and meanwhile, improves the flexibility and economy of virtual power plant scheduling.

The embodiment of the invention provides a combined heat and power generation system. The combined heat and power generation system comprises a steam turbine generator unit, a heat supply network heater, a low-pressure bypass, a steam extraction pipeline, a hot water container, a heat supply and water return pipeline, and a heat supply and water supply pipeline; the first end of the low-pressure bypass communicates with a steam outlet of a reheater, and the second end of the low-pressure bypass communicates with a steam inlet of the heat supply network heater; the first end of the steam extraction pipeline communicates with a steam outlet of a medium-pressure cylinder, and the second end of the steam extraction pipeline communicates with a steam inlet of the heat supply network heater; thehot water container is provided with a hot water inlet and a hot water outlet, and the hot water inlet communicates with a hot water outlet of the heat supply network heater; the heat supply and water return pipeline communicates with a cold water inlet of the heat supply network heater; and the heat supply and water supply pipeline communicates with a hot water outlet of the heat supply networkheater and a hot water outlet of the hot water container. The combined heat and power generation system provided by the embodiment of the invention has the advantages of flexible adjustment of heat and power, large peak shaving depth, good economic benefit, stable load and the like.

The invention discloses a heat-storage power generation system, and belongs to the technical field of thermoelectricity. The heat-storage power generation system comprises a main steam boiler (101), amain steam turbine (102), a main power generator (103) and a steam tank group (104), wherein the main steam boiler is used for generating steam; the inlet of the main steam turbine communicates withthe outlet of the main steam boiler (101); the main steam turbine is used for converting steam energy into mechanical energy; the main power generator is used for converting mechanical energy into electric energy and supplying power to a power grid (200); the steam tank group is equipped with at least one high-pressure tank (104a); the inlet of the steam tank group communicates with the outlet ofthe main steam boiler (101) and/or a steam extraction port of the main steam turbine (102); and the steam tank group is used for storing steam extracted from the main steam boiler (101) and/or the main steam turbine (102), so that load-shedding peak load regulation and frequency regulation can be achieved, and the stored steam can be used for the load-increasing peak load regulation and frequencyregulation during staggered power generation and/or used for heat supply. The heat-storage power generation system disclosed by the invention has the beneficial effect that through the arrangement ofthe steam tank group, the steam generated from the main steam boiler can be extracted for being stored, the stored steam can be used for staggered power generation, and then load-shedding and load-increasing peak load regulation and frequency regulation in the heat-storage power generation system can be quickly achieved.

The invention discloses a thermoelectric decoupling type thermal energy storage heat and power combined supply system, and relates to heat and power combined supply systems. The problem that in the prior art, power source power supply or electric heating related equipment fails, and the system cannot store heat is solved. The system comprises an energy storage power station unit, a steam turbine unit and a heat supply unit; the energy storage power station unit comprises a low-temperature medium tank, a high-temperature medium tank, an electric heater and a gas heater, heat storage media are stored in the low-temperature medium tank and the high-temperature medium tank, the low-temperature medium tank is connected with a low-temperature medium output pipeline, the low-temperature medium output pipeline passes through heating ends of the electric heater and the gas heater and then enters the high-temperature medium tank, and a cooling medium pump is arranged on the low-temperature medium output pipeline and used for pumping low-temperature heat storage media. The gas heater in parallel connection with the electric heater is arranged, and when the power source power supply or electric heating related equipment fails, the gas heater can be used in a switched manner.

The embodiment of the invention discloses a heat supply system comprising a turbine unit (11), a heat pump device (12), a circulating water device (13) and a heat supply device (14); the turbine unit(11) is connected to the circulating water device (13) used for absorbing heat from the turbine unit (11); the heat pump device (12) is connected to the circulating water device (13), and used for absorbing the heat from the circulating water device (13); the heat supply device (14) is connected to the heat pump device (12) used for absorbing the heat from the circulating water device (13) and transferring the heat to the heat supply device (14) for heat supply. Through increase of the heat pump device between the turbine unit and the circulating water device, the problem that the overall turbine needs to be modified during improvement of the heating capacity of a thermal power unit is solved, and the beneficial effects of simple system structure, rational design and reliable performance are achieved.

The invention discloses a thermoelectric unit thermoelectric decoupling system and an operation method. The system comprises a hearth, a heat exchange boiler and a heating station. A water outlet of the heat exchange boiler communicates with a third pipeline and a fourth pipeline, the third pipeline communicates with a water inlet of the heating station, and a water outlet of the heating station communicates with a fifth pipeline. The fifth pipeline is used for communicating with a circulating water inlet of a heat supply network user, the fourth pipeline communicates with the fifth pipeline,the water inlet of the heating station further communicates with a seventh pipeline, the seventh pipeline is used for communicating with a circulating water outlet of the heat supply network user, a water inlet of the heat exchange boiler communicates with a sixth pipeline, the sixth pipeline communicates with the seventh pipeline, a third valve is arranged on the third pipeline, a fourth valve isarranged on the fourth pipeline, a sixth valve is arranged on the sixth pipeline, and a seventh valve is arranged on the seventh pipeline. Thermoelectric decoupling of a thermoelectric unit is realized, and flexibility of the thermoelectric unit is improved.

The invention discloses a heat supply system which comprises a condenser, a first circulating water pump, a second circulating water pump and an electric heat pump system. Condensate water heated by the condenser to first temperature serves as heat source water of the electric heat pump system and is output into evaporators of electric heat pumps of the electric heat pump system through the first circulating water pump; the heat source water of the first temperature of the evaporators is reduced to heat source water of second temperature to extract heat, and the heat extracted from the evaporators is transmitted to heating return water through condensators of the electric heat pumps, and the temperature of the heating return water is increased to fourth temperature from third temperature; and the heating return water of the fourth temperature is output to a heating water supply end by the electric heat pump system to be used for heat supply. Compared with the tradition, according to the heat supply system, the electric heat pumps are adopted as equipment for increasing the heat grade, heat in the condenser is input into the electric heat pumps, high-grade heat is obtained through conversion and used for heat supply, and therefore the influence of electric loads of a thermal power generating unit on heat supply loads in the heat supply season is solved, and thermoelectric decoupling is achieved.

The invention discloses a fuel cell combined heat and power generation microgrid day-ahead scheduling method based on dynamic planning. According to the method, an off-grid household combined heat andpower supply system structure taking a fuel cell as a main prime mover is constructed, and comprises a fuel cell, an air source heat pump, a lithium battery, a phase change heat storage tank and thelike. According to the invention, by establishing a scheduling model, a safety range and a terminal constraint of main equipment of the system, a day-ahead scheduling optimization model taking minimization of fuel cost as a target is constructed, and a dynamic programming algorithm with the terminal constraint is designed to quantitatively solve the economic model; and the thermoelectric decoupling of the off-grid fuel cell combined heat and power generation system can be realized, the thermoelectric supply and demand balance is ensured, and the energy utilization efficiency of the system andthe operation reliability of the lithium battery can be improved.