36results about How to "Improve the ability of deep peak shaving" patented technology

A dual-intelligent-optimization control method for a unit load comprises the steps of firstly establishing a supercritical unit load characteristic nerve network prediction model for condensate throttling, training and verifying the prediction model by means of historical operation data of the unit, respectively predicting and optimizing the opening degree of a deoxygenator water level regulating valve and the opening degree of a stream turbine valve in a dynamic variable-load period and a constant-load period of the unit by the prediction model, and overlapping the deviation between each optimization result and an original control instruction on a corresponding control signal for performing optimization control on the unit. The dual-intelligent-optimization control method has functions of improving the load response speed of the steam turbine in the dynamic variable-load process, ensuring the deoxygenator water level in a safe operation range of the unit, furthermore ensuring high adjustment precision for the unit load in a condensate flow recovering process of the constant-load period, greatly improving deep peak load regulation capability of the unit, and ensuring long-term safe and reliable operation of a thermal power unit.

The invention discloses a method for calculating the pitch peak range of a combined heat and power generation unit. The method includes the steps of firstly, determining the unit AGC maximum power output load line, the boiler minimum stable-combustion power output load line and the unit minimum power generation load line under the heat supply working condition through fitting with the unit heat supply and gas pumping flow as the X axis and the unit power generation load as the Y axis according to the thermal performance data and the heat supply and gas pumping flow of the combined heat and power generation unit; secondly, calculating any one of the unit AGC schedulable power generation load lower limit, the unit AGC schedulable power generation load upper limit and the unit AGC schedulablepower generation load range under the heat supply and gas pumping flow according to the unit AGC maximum power output load line, the boiler minimum stable-combustion power output load line and the unit minimum power generation load line under the heat supply working condition determined through fitting in the first step. In the method, by online calculating the schedulable minimum power generation load, the unit load lower limit is expanded as much as possible, and the aim of improving the power grid depth pitch peach capacity in the heating period is achieved.

The invention relates to a thermal power generating unit working medium shunting circulation peak shaving system. According to a steam turbine principle, a cylinder 0 is added on the basis of setting a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder on a conventional steam turbine; the system is provided with such pipelines and valve accessories as a high-pressure heater 0, a deaerator 0 and an auxiliary front heater for forming a thermal power generating unit working medium shunting circulation peak shaving flexible technology with a steam turbine unit. The unit working medium shunting realizes thermal circulation of a working medium with efficient small circulation formed by the cylinder 0 and basic large circulation formed by the conventional steam turbine consisting of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder. The obvious improvement of the thermal power generating unit deep peak shaving performance and higher heat efficiency of total peak shaving circulation are realized by fully using the advantages of the efficient small circulation and the working medium shunting flexibility of the basic large circulation. The system is suitable for a steam condensing unit or a heating unit, is used for energy conservation and peak shaving performance modification of an active-duty steam turbine generator unit, and is prominent in practical significance.

The invention relates to a high-temperature and high-pressure steam heating fused salt energy storage system of a thermal power plant. The energy storage system comprises a conventional thermal powergeneration system, a steam heating fused salt system and a fused salt heat storage system. The conventional thermal power generation system is a reheating steam unit; the steam heating fused salt system consists of five heat exchangers, and is connected with the thermal power generation system and the fused salt heat storage system to achieve a heat exchange function of high-temperature and high-pressure steam of the thermal power generation system and the fused salt heat storage system. Through the high-temperature and high-pressure steam heating fused salt energy storage system, high-grade steam of the thermal power generation system is stored, and steam in an inlet of a steam turbine can be bypassed away, so that the total thermoelectric decoupling is realized, the flexible operation and the deep peak pitching of the thermal power generation system are facilitated, and meanwhile, the operation safety of a boiler and a turbine generator set is guaranteed.

A low-load stable-combustion direct-current combustor comprises a natural gas pipeline. The natural gas pipeline extends to a central air duct to supply natural gas, a cyclone arranged at the outlet of the central air duct conveys mixed gas to a precombustion chamber for combustion, a primary air pipe providing primary pulverized coal to the precombustion chamber is arranged outside the central air duct, an internal secondary blowdryer providing internal secondary air to the precombustion chamber is arranged outside the primary air pipe, an external secondary blowdryer providing external secondary air to the precombustion chamber is arranged outside the internal secondary blowdryer, the precombustion chamber is divided into an expansion section and a horizontal section along the inlet direction of the mixed gas, an internal-secondary-air annular nozzle is arranged in the intersection of the expansion section and the horizontal section, the internal secondary air is in annular direct-current incidence from the internal-secondary-air annular nozzle, combustion supporting function is achieved, slag build-up and pulverized-coal accumulation can be avoided; the external secondary air is injected in a direct-current oblique manner to supplement air needed for subsequent combustion of pulverized coal flow, and meanwhile, formation of NOx is reduced. By the arrangement, low-load stable combustion of a pulverized-coal combustor can be realized, and deep participation in peak regulating of a coal-fired power plant is favorably improved.

The invention relates to a boiler with a thermal power flexibility regulating function and a regulating method thereof, in particular to the field of opposed firing boilers. The boiler is characterized in that upper burners are burners located on the first layer and the second layer from the top of the boiler; in the upper burners, the front wall and the back wall which are located on the same layer are both provided with the burners, and the burners located on the uppermost layer are set to be peak regulating burners; lower burners are burners located on the first layer from the bottom of the boiler; in the lower burners, any burners on the front wall and / or the back wall are peak regulating burners; the peak regulating burners are internal burning type burners, coal powder can be ignited in the peak regulating burners, and stable burning can be achieved; and the other burners are ordinary burners which are internal burning type burners or external burning type burners. The boiler with the thermal power flexibility regulating function has the beneficial effects that the thermal power operation flexibility and the fuel flexibility of the boiler can be improved, the deep peak regulating capacity of the boiler is remarkably improved, the rapid climbing capacity is achieved, and the boiler can be rapidly started or stopped.

The invention relates to a W-type combustion boiler with a thermal power flexibility adjusting function and an adjusting method of the boiler. The boiler is characterized in that combustors can be divided into front arch combustors and rear arch combustors according to installation positions and types; the front arch combustors comprise front arch common combustors and front arch peak regulation combustors, and the rear arch combustors comprise rear arch common combustors and rear arch peak regulation combustors; one or two front arch peak regulation combustors are arranged in the front arch combustors every two or three front arch common combustors; one or two rear arch peak regulation combustors are arranged in the rear arch combustors every two or three one or two rear arch common combustors; the rear arch peak regulation combustors correspond to the front arch common combustors, and the rear arch common combustors correspond to the front arch peak regulation combustors. The combustion boiler has the advantages that thermal power operation flexibility and fuel flexibility of the boiler can be improved, the deep peak regulation capacity of the boiler is obviously improved, the quick gradeability is achieved, and the boiler can be quickly started and stopped.

The invention relates to the field of peak shaving of thermal power generating units, and discloses a peak shaving method of a thermal power generating unit. The peak shaving method comprises the following steps that firstly, dynamic separators of coal mills are adjusted, so that the fineness of the pulverized coal is less than or equal to the predetermined value of the fineness of the pulverizedcoal; secondly, a condensate pump of a steam and water system is enabled to exit the automatic mode, and the outlet pressure of the condensate pump is manually adjusted to the first pressure predetermined value; thirdly, primary air systems are adjusted; fourthly, the temperature of coal mill outlets of the dynamic separators is adjusted to the first predetermined temperature; fifthly, the openingdegree of secondary windshield plates of secondary air systems is adjusted to the first predetermined range; and sixthly, the load of the thermal power generating unit is reduced to the predeterminedload according to the predetermined speed, and the predetermined speed is less than or equal to 1.5% of rated load per minute. By the adoption of the peak shaving method of the thermal power generating unit, the peak shaving capacity of the thermal power generating unit can be remarkably improved.

The invention discloses a dual fuel raw coal bunker system of a power station boiler provided with a pneumatic loosening device. The system is provided with a high quality fuel coal bunker and a low quality fuel coal bunker which stores a high quality fuel and a low quality fuel independently as well as a high quality fuel coal bunker spile door and a low quality coal bunker spile door which are independently controllable. A plurality of pneumatic loosening pipelines with 4-6 nozzles are arranged on the high quality fuel coal bunker, the low quality fuel coal bunker and a coal falling pipe, each pneumatic loosening pipeline can introduce air with 1.0 MPa pressure into the inner walls of a raw coal bunker and the coal falling pipe continuously or at interval by opening and closing a pneumatic loosening pipeline valve to give a downward action force to raw coal while damaging adhesion between the raw coal and the bunker walls and the pipe walls so as to ensure flexible and precise switching between high quality fuel and low quality fuel and smooth coal unloading in a boiler operating process. The blending combustion proportion of the low quality fuel is increased to the maximum extent while improving the deep peak load regulation capacity of the boiler can be improved, so that the fuel cost of the power plant boiler is lowered and the operating safety and economical benefit of aunit are improved.

The invention discloses a low-load operation system with one furnace and two machines. The low-load operation system comprises two unit system units. Wherein superheated steam of a boiler communicates to steam inlets of high-pressure cylinders of a first steam turbine and a second steam turbine through a main steam pipeline, and the steam flow is controlled through a regulating valve and a shut-off valve. Exhaust steam of the high-pressure cylinder of the first steam turbine enters an intermediate-pressure cylinder through reheating, and exhaust steam of the high-pressure cylinder of the second steam turbine directly enters the intermediate-pressure cylinder. The header system reheating system of the low-load unit is achieved through a simple structure, good economical efficiency and development potential are achieved, and the long-time low-load operation requirement of the thermal power unit under large development of new energy electric power can be effectively met.

A technical scheme of the invention provides a cogeneration unit deep peak regulation system based on zero output of a steam turbine. The other technical scheme of the invention provides a cogeneration unit deep peak regulation method based on zero output of the steam turbine. The basic principle of the system and the method is that most steam passes through a bypass of the steam turbine to supplyheat or steam, and only a small amount of steam is reserved and introduced into the steam turbine to cool blades and rotors of high, medium and low pressure cylinders. At the moment, the steam turbine is only maintained at 3000rpm to operate as a phase modifier, a steam turbine generator unit is in a working condition of a motor, and a generator absorbs a small amount of power from a power grid to operate as the motor. Under the working condition of zero output operation of the steam turbine, the peak regulation capacity and the heat supply capacity of the unit are maximized.

The invention discloses an air pre-heater ash deposition treatment system and method used in a flexible operation mode, and relates to the technical field of air pre-heater ash deposition treatment. The system comprises a coal-fired boiler, an SCR (Selective Catalytic Reduction) denitration system, a flue gas online monitoring system, an air preheater and a flue gas emission system which are sequentially communicated through a pipeline, the primary air pipe penetrates through the air side of the air preheater and then is connected with a coal mill; the coal mill is connected with one end of the coal-fired boiler; the secondary air pipe penetrates through the air side of the air preheater and then is connected with the other end of the coal-fired boiler; the primary air pipe and the secondary air pipe are respectively connected with an air volume adjusting device which is arranged in parallel with the air side of the air preheater; and an air preheater state online monitoring system connected with the control system is mounted on the air preheater. According to the air pre-heater ash deposition treatment method based on the system in the flexible operation mode, ash clogging of the air pre-heater is prevented, and meanwhile the heat exchange efficiency of the air pre-heater is improved to the maximum extent.

The invention discloses a heat-electrolysis coupling system of a heat-storage tank coupling compression type heat pump and an operation method. The heat-electrolysis coupling system comprises a heat storage tank, a hot water pump, a heat storage hot water valve, a first heat release hot water adjusting valve, a second heat release hot water adjusting valve, a hot net heater, a hot user, a hot netcirculating pump, a cold water pump, a heat storage cold water adjusting valve, a first heat release cold water adjusting valve, a second heat release cold water adjusting valve, an evaporator, a throttling valve, a condenser and a compressor. The invention further discloses the operation method of the heat-electrolysis coupling system. According to the heat-electrolysis coupling system, the compression type heat pump is additionally arranged in a cold water pipeline of the heat storage tank, so that the temperature of the cold water entering the heat storage tank is reduced, the temperature difference of the cold water and the hot water of the heat storage tank is expanded, and the water amount of the heat storage tank is reduced under the condition of the same heat storage capacity, so that the volume of the heat storage tank is reduced, and meanwhile, the compression type heat pump consumes part of electric energy, so that the external power supply amount is reduced, and the deep peak shaving performance of a combined heat and power generation unit is improved.

The invention discloses an online coal quality monitoring optimization operation method. A system comprises an intelligent online coal quality analyzer, a coal scraping plate action controller, a coal conveying belt, a coal scraping plate and a coal bunker; the intelligent online coal quality analyzer is installed on the coal conveying belt; the intelligent on-line coal quality analyzer is in communication connection with the coal scraping plate action controller; the coal scraping plate is arranged above the coal conveying belt; the coal scraping plate is in communication connection with the coal scraping plate action controller; and the coal bunker is arranged below the coal conveying belt, and the coal bunker is located below the coal scraping plate. Real-time analysis data of an online coal quality analyzer are fully mined based on an existing intelligent online coal quality analyzer, intelligent control is achieved for different coal qualities according to experience in actual operation, the combustion efficiency of a boiler is effectively improved, meanwhile, deep peak regulation of the boiler is improved, and preventive control over atmospheric pollutants can be effectively achieved.

The invention provides a configuration system of an electric heat-storage peak shaving device, relative safe and reliable, flexible in operation and not too many restrictions on power plant construction conditions. The electric heat-storage device configuration system comprises a peak shaving system, a potential device and a grid, multiple sets of solid heat storage devices of the peak shaving system is taken as a peak shaving body in an integral formed by an entire power plant or a single unit, one set or multiple sets of liquid electric-storage devices are arranged at the same time, the solid heat storage devices are connected with the liquid electric-storage devices through the grid. By the arrangement, intelligent smooth depth peak saving of the grid is realized, impact on the grid is reduced, and heat supply and livelihood protection and peak shaving demands on the grid can be met.

The invention discloses a coupled intelligent control system of a cold flue gas recirculation system and a construction method thereof. The system includes: a data acquisition layer for collecting the operating state data of the boiler and the operating state data of the cold flue gas recirculation system; The processing layer is used to filter the operating status data sent by the data acquisition layer, eliminate the pathological data, and extract the feature quantity; the execution module selection layer is used to perform calculations based on the data processed by the mathematical model and the data processing layer , and make real-time adjustments to the primary circulation volume and secondary circulation volume of the cold flue gas according to the operation results, so that the boiler operates in the best state during the deep peak shaving period; the result output layer is used to perform result output for the intelligent control system, important The output of operating data and abnormal alarm output to guide and remind the operator of the operation. The invention realizes the intelligent adjustment of cold flue gas recirculation, and effectively improves the deep peak-shaving capability of the boiler.

The invention discloses a coupling peak regulation system based on intermediate exhaust and low-pressure steam extraction cooling and an operation method thereof. The coupling peak regulation system comprises a first conventional unit system generator set (13) and a second conventional unit system generator set (14). The first conventional unit system generator set (13) comprises a first medium-pressure cylinder (7), a first low-pressure cylinder (8), a first condensate pump (11), a first low-pressure cylinder steam extraction pipe (19) and a first medium-pressure cylinder steam exhaust control and isolation valve group (1); and the second conventional unit system generator set (14) comprises a second medium-pressure cylinder (9), a second low-pressure cylinder (10), a second condensate pump (12), a second low-pressure cylinder steam extraction pipe (20) and a second medium-pressure cylinder steam exhaust control and isolation valve group (2). According to the operation method, flexible switching between the first conventional unit system generator set (13) and the second conventional unit system generator set (14) is achieved. The deep peak regulation capacity of the unit can be improved without technical transformation on the boiler side, and the operation flexibility of the unit is improved.

The invention provides a heat supply protection control method and device for a combined heat and power generation unit. The heat supply protection control method comprises the steps that first logic interlocking control is conducted on a heat supply high-side system, and second logic interlocking control is conducted on a newly-added heat supply low-side system. The device executes the method. According to the heat supply protection control method and device of the combined heat and power generation unit, it can be guaranteed that relevant steam turbine body and high and low bypass heat supply parameters are located in a safe operation space in the bypass heat supply state, the safety and reliability of the unit in the bypass heat supply state are improved, and the continuous response speed of the unit to heat and power load changes is increased; and the deep peak regulation capacity of the unit can be improved.

The invention discloses a calculation method for the peak-shaving range of a combined heat and power unit, which includes: Step 1. According to the thermal characteristic data of the combined heat and power unit and the flow rate of heating and extraction steam, the unit heating and extraction flow is taken as the X axis, and the The power generation load of the unit is the Y axis, and the maximum AGC output load line of the unit, the minimum stable combustion output load line of the boiler, and the minimum power generation load line of the unit under heating conditions are determined by fitting respectively; The output load line, the minimum stable combustion output load line of the boiler, and the minimum power generation load line of the unit under heating conditions, calculate the lower limit of the generating load that can be dispatched by the AGC of the unit, the upper limit of the generating load that can be dispatched by the AGC of the unit, and the AGC of the unit under any heating and extraction flow Schedulable power generation load range. The invention can dispatch the minimum power generation load through online calculation, expand the lower limit of unit load as much as possible, and achieve the purpose of improving the deep peak-shaving capability of the power grid during the heating period.

A dual-intelligent-optimization control method for a unit load comprises the steps of firstly establishing a supercritical unit load characteristic nerve network prediction model for condensate throttling, training and verifying the prediction model by means of historical operation data of the unit, respectively predicting and optimizing the opening degree of a deoxygenator water level regulating valve and the opening degree of a stream turbine valve in a dynamic variable-load period and a constant-load period of the unit by the prediction model, and overlapping the deviation between each optimization result and an original control instruction on a corresponding control signal for performing optimization control on the unit. The dual-intelligent-optimization control method has functions of improving the load response speed of the steam turbine in the dynamic variable-load process, ensuring the deoxygenator water level in a safe operation range of the unit, furthermore ensuring high adjustment precision for the unit load in a condensate flow recovering process of the constant-load period, greatly improving deep peak load regulation capability of the unit, and ensuring long-term safe and reliable operation of a thermal power unit.

The invention discloses a deep peak regulation dry and wet state switching system for a supercritical boiler, which comprises a multi-stage flow limiting device and a flash tank, after the supercritical boiler is switched to a wet state, high-temperature saturated water flows through the multi-stage flow limiting device through a pipeline for pressure reduction, and then enters the flash tank; expansion steam generated after expansion evaporation in the flash tank is divided into two paths, namely a first pipeline and a second pipeline, and the expansion steam in the first pipeline is drained to a steam inlet pipeline of a second high-pressure heater through a pipeline so as to replace part of extracted steam of the second high-pressure heater to heat feed water. The method is suitable for the supercritical boiler without a boiler water circulating pump to be converted from a dry state to a wet state for operation, and full recovery of working media and heat after the supercritical boiler is converted into the wet state for operation and continuous operation after deep peak regulation is converted into the wet state are achieved.

The invention discloses a control method and device for a pulverizing system. The method comprises the steps that the current operation mode of a coal mill is determined according to the opening number of exit doors; an allowable switching mode of the coal mill is determined according to the current operation mode and the allowable change value and the allowable minimum value of the opening number; if a switching instruction for a target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode, the coal mill is switched from the current operation mode to the target operation mode corresponding to the target switching mode; and by changing the opening number of the exit doors of the coal mill and changing the operation mode of the coal mill, the pulverized coal concentration of remaining pulverized coal pipes can be improved on the basis of closing different numbers of exit doors of the coal mill, and therefore the coal quantity control flexibility of the pulverizing system in the deep peak regulation period is improved on the basis that the safety of a unit is guaranteed.

The invention discloses a heat-electrolysis coupling system of a heat-storage tank coupling compression type heat pump and an operation method. The heat-electrolysis coupling system comprises a heat storage tank, a hot water pump, a heat storage hot water valve, a first heat release hot water adjusting valve, a second heat release hot water adjusting valve, a hot net heater, a hot user, a hot netcirculating pump, a cold water pump, a heat storage cold water adjusting valve, a first heat release cold water adjusting valve, a second heat release cold water adjusting valve, an evaporator, a throttling valve, a condenser and a compressor. The invention further discloses the operation method of the heat-electrolysis coupling system. According to the heat-electrolysis coupling system, the compression type heat pump is additionally arranged in a cold water pipeline of the heat storage tank, so that the temperature of the cold water entering the heat storage tank is reduced, the temperature difference of the cold water and the hot water of the heat storage tank is expanded, and the water amount of the heat storage tank is reduced under the condition of the same heat storage capacity, so that the volume of the heat storage tank is reduced, and meanwhile, the compression type heat pump consumes part of electric energy, so that the external power supply amount is reduced, and the deep peak shaving performance of a combined heat and power generation unit is improved.

The invention discloses a renewable energy consumption capacity improving method considering thermal power flexibility transformation cost, which comprises the following steps of: determining a unit output parameter according to an operation state and an energy consumption characteristic of a thermal power unit; drawing a thermal power generating unit consumption characteristic diagram according to the value of the unit output parameter, and establishing a thermal power generating unit peak regulation cost function; establishing an operation cost optimization model containing a high-proportionrenewable power system by combining a thermal power generating unit peak regulation cost function and considering constraint conditions and transformation cost to increase new energy consumption andreduce system operation cost; applying deep peak regulation compensation to an operation cost optimization model containing a high-proportion renewable power system; and determining the optimal peak regulation compensation coefficient of the thermal power generating unit by considering renewable energy output. The cost of the thermal power generating unit can be fully considered, the enthusiasm ofthe thermal power plant to participate in flexibility transformation is improved, and meanwhile, the deep peak regulation capacity of the thermal power generating unit is improved to improve the absorption capacity of renewable energy.

The invention discloses a power grid steam temperature and pressure reduction device, a thermoelectric peak shaving system and a pressure reduction adjusting method.The power grid steam temperature and pressure reduction device comprises a main pipeline, a plurality of source steam pipelines, a plurality of variable throttling parts, a bypass pipeline and an adjusting valve, the main pipeline is provided with a first end and a second end, and the source steam pipelines are connected with the first end; the second end is suitable for being communicated with a user side, the variable throttling elements are arranged on the main pipeline and suitable for adjusting the flow area of the main pipeline, the bypass pipeline is provided with a third end and a fourth end, the third end and the fourth end are both communicated with the main pipeline, and the adjusting valve is arranged on the bypass pipeline. According to the power grid steam temperature and pressure reduction device, the through-flow area of the throttling component can be changed according to the source steam pressure and user requirements, the pressure adjusting capacity and the adjustable pressure range are improved, the steam supply pressure of industrial users can be guaranteed under the condition that the load of a power plant unit fluctuates in a large range, and the deep peak regulation capacity of the power plant is improved.

The invention provides an electric heat storage device configuration system. The system comprises a power grid, a voltage transformation device and a peak regulation system connected with the power grid, the peak regulation system comprises a solid electric heat storage device (3) and a liquid electric heat storage device (4), and when the solid electric heat storage device (3) and / or the liquid electric heat storage device (4) are / is started, an input voltage input to the solid electric heat storage device (3) and / or the liquid electric heat storage device (4) is increased to a specified voltage in a slope mode. The intelligent smooth deep peak regulation of a power grid is realized, the impact on the power grid is reduced, and both the heat supply livelihood guarantee and the power gridpeak regulation demand are met.

The invention discloses a deep peak regulation dry and wet state switching system for a supercritical boiler, which comprises a multi-stage flow limiting device and a flash tank, after the supercritical boiler is switched to a wet state, high-temperature saturated water flows through the multi-stage flow limiting device through a pipeline for pressure reduction, and then enters the flash tank; expansion steam generated after expansion evaporation in the flash tank is divided into two paths, namely a first pipeline and a second pipeline, and the expansion steam in the first pipeline is drained to a steam inlet pipeline of a second high-pressure heater through a pipeline so as to replace part of extracted steam of the second high-pressure heater to heat feed water. The method is suitable for the supercritical boiler without a boiler water circulating pump to be converted from a dry state to a wet state for operation, and full recovery of working media and heat after the supercritical boiler is converted into the wet state for operation and continuous operation after deep peak regulation is converted into the wet state are achieved.

The invention relates to a thermal power generating unit working medium shunting circulation peak shaving system. According to a steam turbine principle, a cylinder 0 is added on the basis of setting a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder on a conventional steam turbine; the system is provided with such pipelines and valve accessories as a high-pressure heater 0, a deaerator 0 and an auxiliary front heater for forming a thermal power generating unit working medium shunting circulation peak shaving flexible technology with a steam turbine unit. The unit working medium shunting realizes thermal circulation of a working medium with efficient small circulation formed by the cylinder 0 and basic large circulation formed by the conventional steam turbine consisting of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder. The obvious improvement of the thermal power generating unit deep peak shaving performance and higher heat efficiency of total peak shaving circulation are realized by fully using the advantages of the efficient small circulation and the working medium shunting flexibility of the basic large circulation. The system is suitable for a steam condensing unit or a heating unit, is used for energy conservation and peak shaving performance modification of an active-duty steam turbine generator unit, and is prominent in practical significance.

The invention discloses a control method for improving the deep peak-shaving capability of a power plant, which belongs to the field of power system operation and control. In the present invention, a large-capacity electric heat storage device is arranged on the side of the thermal power plant to improve the deep peak-shaving capacity of the thermal power plant when the peak-shaving capability of the thermal power unit is insufficient. Increasing the output reduction range of power plants has effectively improved the ability of deep peak regulation of power plants, and at the same time increased the number of power plants with deep peak regulation capabilities. At the same time, by setting the electric heat storage device through this method, the heat supply and power supply of the combined heat and power unit are effectively separated, the flexibility of the power supply of the combined heat and power plant is improved, and the heat supply capacity is effectively improved.