Adjustment system of water supply thermal storage type thermoelectric generating set, and design method and operation method therefor

Abstract

Provided in the present invention are an adjustment system of a water supply thermal storage type thermoelectric generating set, and a design method and operation method therefor. The adjustment system comprises a high-pressure regenerative system, which is provided with a water supply outlet and a water drain outlet, wherein the water supply outlet is connected to a boiler by means of a water supply pipe; and a working medium heat storage system, which is connected to the water supply outlet or the water drain outlet by means of a water intake pipe, and is connected to the water supply pipe by means of a water output pipe. High-temperature supplied water or high-temperature drained water outputted from the high-pressure regenerative system is subjected to heat storage by means of the working medium heat storage system, and the working medium heat storage system can be decoupled or adjustably coupled between the high-pressure regenerative system and the boiler. When a load needs to be rapidly adjusted, the high-pressure regenerative system is decoupled from the boiler, the working medium heat storage system is used to supply water to the boiler so as to increase the feedwater flow and thermal load, and the feedwater flow of the working medium heat storage system is adjusted in combination with the maximum load lifting rate and the maximum load rate adjusting range of the thermoelectric generating set.

Description

A feedwater thermal storage type thermal power generator unit regulation system, design method and operation method Technical Field

[0001] The present invention belongs to the technical field of thermal power generation peak regulation, and in particular relates to a regulating system, a design method and an operating method of a feedwater thermal storage type thermal power generating set. Background Art

[0002] The "dual carbon" strategy is driving the construction of a new power system dominated by renewable energy. The large-scale grid integration of renewable energy sources, such as photovoltaic and wind power, which exhibit random fluctuations, will inevitably force coal-fired power generation units, primarily responsible for basic power generation, to fully participate in deep peak regulation. Traditional thermal power units face two major challenges in adapting to the comprehensive deep peak regulation of this new power system: limited low-load capacity and insufficient peak regulation; and low load-variability and inadequate load response.

[0003] Conventional thermal power units typically operate between 50% and 100% of rated load due to factors such as stable combustion in low-load boilers, pollutant emission control, and turbine low-pressure cylinder safety. However, the construction of new power systems aims to increase the peak load regulation range of thermal power units to 20% to 100%, or even 0% to 100% of rated load. Due to the thermal inertia of thermal power units, the peak load regulation rate of current thermal power units is generally 1% to 2% of rated load per minute, making it increasingly difficult to meet the frequency regulation requirements of new power systems in the context of large-scale renewable energy grid integration.

[0004] Therefore, the current national energy science and technology field is mobilizing the whole country to tackle the bottleneck technology of increasing the peak regulation rate of thermal power units to 3%-5% of rated load / min.

[0005] Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, the purpose of the present invention is to provide a water-feed thermal storage type thermal power generator unit regulation system, design method and operation method, which are mainly used to solve the problems of poor peak-shaving capacity and slow load change response of thermal power generator units in the existing technology.

[0007] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0008] In a first aspect, the present invention provides a water supply thermal storage type thermal power generator unit regulating system, comprising:

[0009] The high-pressure heat recovery system is provided with a water supply outlet and a drain outlet, wherein the water supply outlet is connected to the boiler through a water supply pipe;

[0010] A working medium heat storage system is connected to the water supply outlet or drain outlet via a water inlet pipe and is connected to the water supply pipe via a water outlet pipe;

[0011] The working fluid heat storage system can be decoupled or arranged between the high-pressure heat recovery system and the boiler with an adjustable coupling degree. The volume of the working fluid heat storage system is determined by the maximum load increase rate of the generator set and the water supply parameters corresponding to the maximum load rate adjustment range.

[0012] In some embodiments, the working fluid heat storage system includes a feed water heat storage device, a first control valve, a second control valve, and a third control valve;

[0013] The first control valve is provided on the water inlet pipe of the water supply heat storage device, and the water inlet pipe is connected to the water supply outlet;

[0014] The second control valve is provided on the water outlet pipe of the water supply heat storage device, and the water outlet pipe is connected to the water supply pipe;

[0015] A third control valve is provided on a bypass of a section of the water supply pipe between the water inlet pipe and the water outlet pipe.

[0016] In some embodiments, the first control valve, the second control valve, and the third control valve are respectively on-off valves or regulating valves.

[0017] In some embodiments, the working fluid heat storage system includes a water supply heat storage device and a water supply make-up pump, the water supply make-up pump is arranged on the water outlet pipe of the water supply heat storage device, and the water outlet pipe is connected to the water supply pipe.

[0018] In some embodiments, a steam drum and a high-pressure steam extraction stage are further included, and the feed water heat storage device is connected to the high-pressure steam pipeline between the steam drum and the high-pressure steam extraction stage through a steam extraction pipeline, and the steam extraction pipeline is provided with an on-off valve, a regulating valve or a check valve.

[0019] In some embodiments, the working fluid heat storage system includes a hydrophobic heat storage device and a hydrophobic pump;

[0020] The hydrophobic heat storage device is connected to the hydrophobic outlet via the water inlet pipe;

[0021] The drain pump is arranged on the water outlet pipe of the drain heat storage device, and the water outlet pipe is connected to the water supply pipe.

[0022] In some embodiments, the water supply outlet of the high-pressure heat recovery system is connected to the hydrophobic heat storage device through a drain valve.

[0023] In some embodiments, the working fluid thermal storage system is further provided with a heat preservation device, and the heat preservation device is used to keep the volume cavity for storing the working fluid in the working fluid thermal storage system warm.

[0024] In some embodiments, a condenser and a condensate pump are further included, a condensate storage device is provided between the condenser and the condensate pump, and the inlet and outlet of the condensate storage device and its bypass are respectively provided with a condensate on-off valve or a condensate regulating valve.

[0025] In some embodiments, the condensate storage device is a normal pressure device and is set at a specific height. Its condensate inlet pumps condensate into it by setting a condensate storage pump, and its condensate outlet is directly connected to the working fluid heat storage system through a second condensate on-off valve or a second condensate regulating valve.

[0026] In some embodiments, a deaerator and a water feed pump are further included, a deoxygenated water storage device is provided between the deaerator and the water feed pump, and the inlet and outlet of the deoxygenated water storage device and its bypass are respectively provided with a deoxygenated water on-off valve or a deoxygenated water regulating valve.

[0027] In some embodiments, the deoxygenated water storage device is a normal pressure device and is arranged at a specific height. Its deoxygenated water inlet pumps deoxygenated water into it by setting a deoxygenated water storage pump, and its deoxygenated water outlet is directly connected to the working fluid heat storage system through a second deoxygenated water on-off valve or a second deoxygenated water regulating valve.

[0028] In some embodiments, the volume cavity is composed of a variable-volume working fluid storage container, and the variable-volume working fluid storage container adjusts its variable-volume range according to the load increase rate of the generator set.

[0029] In a second aspect, the present invention provides a method for designing a regulation system for a feedwater thermal storage type thermal power generator set, which is applied to a regulation system for a feedwater thermal storage type thermal power generator set as described above, comprising:

[0030] Set the maximum load increase rate of the generator set to X% rated load / min and the load rate adjustment range to A% to B%;

[0031] According to the maximum load increase rate and the set load rate adjustment range, the corresponding water mass flow rate under A% load is calculated to be G1 (kg / s), and the corresponding water mass flow rate under B% load is G2 (kg / s);

[0032] Assume that the specific volume of the working fluid transported from the working fluid heat storage system through the outlet pipe to the water supply pipe is v1 (m 3 / kg), the volume of the working fluid heat storage system can be determined as 30*(BA)·(G2-G1)·v1 / X·(1±50%).

[0033] In some embodiments, the feedwater thermal storage type thermal power generator regulating system further includes a condensate storage device and / or a deoxygenated water storage device;

[0034] The outlet working fluid specific volume of the condensate storage device is v2, and the volume of the working fluid thermal storage system is 30*(BA)·(G2-G1)·v2 / X·(1±50%);

[0035] The outlet working fluid specific volume of the deoxygenated water storage device is v3, and the volume of the working fluid heat storage system is 30*(BA)·(G2-G1)·v3 / X·(1±50%).

[0036] In a third aspect, the present invention provides a method for designing a regulation system for a feedwater thermal storage type thermal power generator set, which is applied to a regulation system for a feedwater thermal storage type thermal power generator set as described above, comprising:

[0037] Set the maximum load increase rate of the generator set to X`% rated load / min and set the load rate adjustment range to A`% to B`%, and calculate the corresponding water mass flow rate under the load of A`% as G`1, the corresponding water mass flow rate under the load of B`% as G`2, and determine the minimum water mass flow rate as G`0;

[0038] The heat recovery system feed water flow rapid drop time T1 and the heat recovery system minimum feed water flow duration T2 based on the unit load increase rate and the minimum flow of the heat recovery system;

[0039] Assuming that the specific volume of the working fluid transported from the working fluid heat storage system through the water outlet pipe to the water supply pipe is v`1, the volume of the working fluid heat storage system is (T1+T2)·(2G`2-G`1-G`0)) / 4)·v`1·(1±50%).

[0040] In some embodiments, the feedwater thermal storage type thermal power generator regulating system further includes a condensate storage device and / or a deoxygenated water storage device;

[0041] The outlet working fluid specific volume of the condensate storage device is v`2, and the volume of the working fluid heat storage system is (T1+T2)·(2G`2-G`1-G`0)) / 4)·v`2·(1±50%);

[0042] The outlet working fluid specific volume of the deoxygenated water storage device is v`3, so the volume of the working fluid heat storage system is (T1+T2)·(2G`2-G`1-G`0)) / 4)·v`3·(1±50%).

[0043] In a fourth aspect, the present invention provides an operating method for a feedwater thermal storage type thermal power generator regulating system as described above, comprising:

[0044] receiving a load increase signal and utilizing a working fluid heat storage system to decouple the high-pressure heat recovery system from the boiler;

[0045] Combined with the first control information of the turbine main steam regulating valve, the second control information for adjusting the water feed amount of the working fluid heat storage system is generated to increase the boiler feed water flow without increasing the heat recovery extraction load of the turbine heat recovery system, thereby releasing the stored energy of the working fluid heat storage system.

[0046] In some embodiments, in response to the maximum load increase rate of the generator set, third control information for adjusting the water feed amount of the working fluid heat storage system and fourth control information for adjusting the water feed amount of the heat recovery system are synchronously generated. Combined with the third control information and the fourth control information, the heat recovery extraction of the turbine heat recovery system is synchronously reduced and the feed water flow of the boiler is increased to release the stored energy of the working fluid heat storage system.

[0047] In some embodiments, after receiving the load increase signal, the opening degree of the condensate pump and / or the feedwater pump is reduced, and the steam extraction of each stage of the steam turbine unit is reduced.

[0048] Compared with the prior art, the present invention has at least the following beneficial effects:

[0049] The working fluid heat storage system is used to store heat in the high-temperature feed water or high-temperature drain water output from the high-pressure heat recovery system, and is arranged between the high-pressure heat recovery system and the boiler in a decoupled or adjustable coupling manner. When the load needs to be adjusted quickly, the high-pressure heat recovery system is decoupled from the boiler, and the working fluid heat storage system is used to supply water to the boiler, thereby increasing the water feed volume and heat load. The water feed volume of the working fluid heat storage system is adjusted in combination with the maximum load increase rate and the maximum load rate adjustment range of the generator set.

[0050] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.

[0052] FIG1 is a schematic structural diagram of a feedwater thermal storage type thermal power generator regulating system according to an embodiment.

[0053] FIG2 is a schematic structural diagram of a feedwater thermal storage type thermal power generator regulating system according to another embodiment.

[0054] FIG3 is a schematic structural diagram of a feedwater thermal storage type thermal power generator regulating system according to another embodiment.

[0055] FIG4 is a schematic structural diagram of a feedwater thermal storage type thermal power generator regulating system according to another embodiment. DETAILED DESCRIPTION

[0056] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0057] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of the present invention, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be directly connected to the other device but with an intervening device.

[0059] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0060] In a first aspect, referring to FIG1 and FIG2 , the present invention provides a feedwater thermal storage type thermal power generator regulating system, comprising:

[0061] The high-pressure heat recovery system is provided with a water supply outlet and a drain outlet, wherein the water supply outlet is connected to the boiler through a water supply pipe;

[0062] Preferably, the high-pressure heat recovery system includes a deaerator, a feedwater pump, and a high-pressure heater connected in sequence by water pipes, wherein the high-pressure heater is provided with a feedwater outlet and a drain outlet, the feedwater outlet being an outlet for feedwater delivered from the feedwater pump, and the drain outlet being an outlet for drain condensed after steam is extracted from the high-pressure cylinder of the steam turbine; of course, the steam supply and feedwater supply of the high-pressure heater are both adjustable in flow rate;

[0063] A working medium heat storage system is connected to the water supply outlet or drain outlet via a water inlet pipe and is connected to the water supply pipe via a water outlet pipe;

[0064] The working fluid heat storage system can be decoupled or arranged between the high-pressure heat recovery system and the boiler with an adjustable degree of coupling. That is, by controlling the corresponding valve in the working fluid heat storage system, the regulating system can be switched from the original state in which the high-pressure heat recovery system directly supplies water to the boiler to the state in which the high-pressure heat recovery system supplies liquid to the working fluid heat storage system, and then the working fluid heat storage system supplies water to the boiler. This is equivalent to decoupling the high-pressure heat recovery system and the boiler. Moreover, regardless of whether the high-pressure heat recovery system and the boiler are in a directly connected state or in a decoupled state, the working fluid heat storage system can adjust the degree of coupling.

[0065] Specifically, when the high-pressure heat regeneration system is directly connected to the boiler, the flow rate of the working fluid heat storage system's water outlet pipe is blocked or reduced, and the flow rate of the working fluid heat storage system's water inlet pipe is opened or increased to control the flow rate and timing of the working fluid from the high-pressure heat regeneration system entering the working fluid heat storage system. This allows the working fluid to be stored in the working fluid heat storage system to achieve heat storage when peak load regulation is not required.

[0066] When the high-pressure heat recovery system and the boiler are in a decoupled state, the working fluid flow rate of the working fluid heat storage system water inlet pipe and / or outlet pipe is controlled to control the working fluid flow rate flowing from the working fluid heat storage system to the boiler, so as to achieve rapid input of high-calorie working fluid in the working fluid heat storage system to the boiler in a controllable flow state during peak load regulation;

[0067] Among them, the volume of the working fluid heat storage system is determined by the water supply parameters corresponding to the maximum load increase rate and the maximum load rate adjustment range of the generator set. In order to achieve rapid peak regulation and improve the response speed, after adding a working fluid heat storage system that can supply liquid, it is necessary to consider whether the volume of this working fluid heat storage system can meet the maximum load increase rate and the maximum load rate adjustment range of the generator set. Therefore, the water supply parameters related to the control time factor are calculated through the maximum load increase rate and the maximum load rate adjustment range of the generator set, and this water supply parameter is used to determine the volume of the working fluid heat storage system.

[0068] Preferably, the water supply parameter is related to the control time factor t, which characterizes whether the working fluid heat storage system reaches the corresponding maximum or minimum load rate at the set maximum load increase rate within the time t. Optionally, t is 0, that is, there is no lag; optionally, t is greater than 0, that is, there is lag.

[0069] Example 1:

[0070] 1 , in this embodiment 1, the working fluid heat storage system includes a feed water heat storage device, a first control valve, a second control valve, and a third control valve; the feed water heat storage device is used to store feed water output from the feed water outlet of the high-pressure heat recovery system;

[0071] The first control valve is provided on the water inlet pipe of the water supply heat storage device, and the water inlet pipe is connected to the water supply outlet;

[0072] The second control valve is provided on the water outlet pipe of the water supply heat storage device, and the water outlet pipe is connected to the water supply pipe;

[0073] A third control valve is provided on a bypass of a section of the water supply pipe between the water inlet pipe and the water outlet pipe.

[0074] Preferably, the first control valve, the second control valve and the third control valve are respectively on-off valves or regulating valves. The on-off valves are characterized by having only two states, on and off, and the regulating valves are characterized by being able to adjust the flow rate by adjusting the opening.

[0075] The first control valve can be used to control whether the water outlet of the high-pressure heat recovery system supplies water to the water supply heat storage device; the second control valve can be used to control whether the water outlet pipe of the water supply heat storage device supplies water to the boiler; the third control valve can be used to control whether the high-pressure heat recovery system and the boiler directly supply water.

[0076] As an implementation method, the working fluid heat storage system includes a water supply heat storage device and a water supply make-up pump. The water supply make-up pump is arranged on the water outlet pipe of the water supply heat storage device. The water outlet pipe is connected to the water supply pipe. The water outlet in the water supply heat storage device is supplied to the water supply pipe through the water supply make-up pump, and the power frequency of the water supply make-up pump is adjustable to control the water supply volume.

[0077] Furthermore, the generator set also includes a steam drum and a high-pressure steam extraction stage. The feed water heat storage device is connected to the high-pressure steam pipeline between the steam drum and the high-pressure steam extraction stage through a steam extraction pipeline. The steam extraction pipeline is provided with an on-off valve, a regulating valve or a check valve. The steam drum is the steam-water separation device of the supercritical unit. The steam extraction pipeline is led out from a high-pressure steam pipeline between the steam drum and the first-stage high-pressure steam extraction and connected to the feed water heat storage device to realize steam extraction heating.

[0078] Example 2:

[0079] 2 , in this embodiment 2, the working fluid heat storage system includes a drain heat storage device and a drain pump; the drain heat storage device is used to store drain condensed after the steam is extracted and output from the drain outlet of the high-pressure heat recovery system;

[0080] The hydrophobic heat storage device is connected to the hydrophobic outlet via the water inlet pipe; optionally, a fourth control valve is provided on the water inlet pipe;

[0081] The drain pump is provided on the outlet pipe of the hydrophobic thermal storage device, and the outlet pipe is connected to the water supply pipe; by adjusting the drain pump, the water supply amount of the hydrophobic thermal storage device can be controlled;

[0082] Optionally, the water supply outlet of the high-pressure heat recovery system is connected to the hydrophobic heat storage device through a drain valve; that is, the high-pressure heat recovery system can simultaneously or optionally connect the water supply outlet and the drain outlet to the hydrophobic heat storage device, so that the drain water can be stored in the hydrophobic heat storage device, or the feed water can be stored in the hydrophobic heat storage device, and then the water supply amount of the hydrophobic heat storage device is controlled by the drain pump.

[0083] The drain valve works on the principle that when the drain heat storage device is connected to the high-pressure heater drain, its pressure is relatively low (only about 5MPa for a subcritical unit), while the feed water pressure is relatively high (19-30MPa). Due to the limited drain capacity, the drain valve can be used to directly release the feed water into the drain heat storage device to quickly store heat.

[0084] As an embodiment, the working fluid thermal storage system is further provided with a heat preservation device, which is used to insulate the volume cavity for storing the working fluid in the working fluid thermal storage system. Since the working fluid stored in the working fluid thermal storage system has a high temperature and energy storage is performed at a specific time, such as at night when the ambient temperature is low, if the volume cavity for storing the working fluid in the working fluid thermal storage system is not insulated, the stored energy will easily be wasted.

[0085] Optionally, the heat-insulating device further comprises a heat-insulating component for heat-insulating the volume cavity. Preferably, the heat-insulating component is a heat-insulating material such as heat-insulating cotton.

[0086] Optionally, the heat preservation device further includes an electric heating component to heat the volume cavity.

[0087] Optionally, the heat preservation device monitors the temperature of the working fluid in the volume chamber in real time, and when the temperature of the working fluid drops, high-temperature working fluid is input again from the high-pressure heat recovery system.

[0088] 3 , as an embodiment, it further includes a condenser and a condensate pump, a condensate storage device is provided between the condenser and the condensate pump, and the inlet and outlet of the condensate storage device and its bypass are respectively provided with a condensate on-off valve or a condensate regulating valve.

[0089] The condensate storage device is a normal pressure device and is set at a specific height. Its condensate inlet pumps condensate into it by setting a condensate storage pump, and its condensate outlet is directly connected to the working fluid heat storage system through a second condensate on-off valve or a second condensate regulating valve.

[0090] In conjunction with Figure 4, as an embodiment, it also includes a deaerator and a water feed pump, a deoxygenated water storage device is provided between the deaerator and the water feed pump, and the inlet and outlet of the deoxygenated water storage device and its bypass are respectively provided with a deoxygenated water on-off valve or a deoxygenated water regulating valve.

[0091] The deoxygenated water storage device is a normal pressure device and is arranged at a specific height. Its deoxygenated water inlet is pumped with deoxygenated water by a deoxygenated water storage pump, and its deoxygenated water outlet is directly connected to the working fluid heat storage system through a second deoxygenated water on-off valve or a second deoxygenated water regulating valve.

[0092] Through the condensate pump, feed water pump, condensate storage device and deaeration water storage device, the feed water circulation volume on the low-pressure heat recovery side can be controlled to adapt to the feed water supply when achieving rapid peak regulation and maintain high energy of the feed water.

[0093] As an embodiment, the volume cavity is composed of a variable-volume working fluid storage container, and the variable-volume working fluid storage container adjusts its variable-volume range according to the load-increasing rate of the generator set. The variable-volume working fluid storage container can increase or decrease its actual volume by adjusting its internal blocking component. Moreover, when the load-increasing rate changes, the variable-volume range of the variable-volume working fluid storage container will also change. The greater the load-increasing rate, the greater the variable-volume range of the variable-volume working fluid storage container.

[0094] Optionally, the variable volume granularity of the actual volume of the variable volume working fluid storage container, that is, the change speed, is related to the load increase rate of the generator set. The greater the load increase rate of the generator set, the greater the change speed, and the smaller the load increase rate of the generator set, the smaller the change speed, so as to achieve rapid peak regulation under different demands.

[0095] In a second aspect, the present invention provides a method for designing a regulation system for a feedwater thermal storage type thermal power generator set, which is applied to a regulation system for a feedwater thermal storage type thermal power generator set as described above, comprising:

[0096] The maximum load increase rate of the generator set is set to X% rated load / min and the load rate adjustment range is set to A% to B%. The range A% to B% refers to the load range under continuous high-rate adjustment. In some possible embodiments, this load range is smaller than the maximum load rate adjustment range of the generator set; the same applies hereinafter.

[0097] According to the maximum load increase rate and the set load rate adjustment range, the corresponding water mass flow rate under A% load is calculated to be G1 (kg / s), and the corresponding water mass flow rate under B% load is G2 (kg / s);

[0098] Assume that the specific volume of the working fluid transported from the working fluid heat storage system through the outlet pipe to the water supply pipe is v1 (m 3 / kg), the volume of the working fluid heat storage system can be determined as 30*(BA)·(G2-G1)·v1 / X·(1±50%).

[0099] Example 3:

[0100] In this embodiment 3, the maximum load rate is 5% rated load / min, and the maximum load rate adjustment range is 20% to 100%. The corresponding water mass flow rate at 20% load is G1 (kg / s), and the corresponding water mass flow rate at 100% load is G2 (kg / s). The specific volume of the working fluid transported from the working fluid heat storage system through the water outlet pipe to the water feed pipe is v1 (m 3 / kg);

[0101] The volume of the working fluid heat storage system is determined by the maximum load rate of the generator set and the integrated volume of the water supply corresponding to the maximum load rate adjustment range. The volume of the working fluid heat storage system is 480(G2-G1)·v1·(1±50%)(m 3 ).

[0102] Optionally, the feedwater thermal storage type thermal power generator regulating system further includes a condensate storage device and / or a deoxygenated water storage device; the volume design of the condensate storage device and the deoxygenated water storage device may refer to the volume design of the working fluid thermal storage system in this embodiment;

[0103] The outlet working fluid specific volume of the condensate storage device is v2, and the volume of the working fluid thermal storage system is 30*(BA)·(G2-G1)·v2 / X·(1±50%);

[0104] The outlet working fluid specific volume of the deoxygenated water storage device is v3, and the volume of the working fluid heat storage system is 30*(BA)·(G2-G1)·v3 / X·(1±50%).

[0105] In a third aspect, the present invention provides a method for designing a regulation system for a feedwater thermal storage type thermal power generator set, which is applied to a regulation system for a feedwater thermal storage type thermal power generator set as described above, comprising:

[0106] Set the maximum load increase rate of the generator set to X`% rated load / min and set the load rate adjustment range to A`% to B`%, and calculate the corresponding water mass flow rate under the load of A`% as G`1, the corresponding water mass flow rate under the load of B`% as G`2, and determine the minimum water mass flow rate as G`0;

[0107] The heat recovery system feedwater flow rapid decline time T1 and the heat recovery system minimum feedwater flow duration T2 are based on the unit load increase rate and the minimum flow rate of the heat recovery system. It should be noted that the above time focuses on the time difference of the feedwater thermal storage device participating in the regulation (feedwater decoupling). In extreme cases, the feedwater flow of the heat recovery system suddenly drops to 0, and all feedwater is provided by the feedwater thermal storage device.

[0108] Assuming that the specific volume of the working fluid transported from the working fluid heat storage system through the outlet pipe to the water supply pipe is v'1, the volume of the working fluid heat storage system is (T1+T2)·(2G'2-G'1-G'0)) / 4)·v'1·(1±50%)(m 3 ).

[0109] Optionally, the feedwater thermal storage type thermal power generator regulating system further includes a condensate storage device and / or a deoxygenated water storage device; the volume design of the condensate storage device and the deoxygenated water storage device may refer to the volume design of the working fluid thermal storage system in this embodiment;

[0110] The outlet working fluid specific volume of the condensate storage device is v`2, and the volume of the working fluid heat storage system is (T1+T2)·(2G`2-G`1-G`0)) / 4)·v`2·(1±50%);

[0111] The outlet working fluid specific volume of the deoxygenated water storage device is v`3, so the volume of the working fluid heat storage system is (T1+T2)·(2G`2-G`1-G`0)) / 4)·v`3·(1±50%).

[0112] In a fourth aspect, the present invention provides an operating method for a feedwater thermal storage type thermal power generator regulating system as described above, comprising:

[0113] receiving a load increase signal and utilizing a working fluid heat storage system to decouple the high-pressure heat recovery system from the boiler; allowing feed water or drainage water from the high-pressure heat recovery system to first enter the working fluid heat storage system, and then the working fluid heat storage system to feed water to the boiler;

[0114] Combined with the first control information of the turbine main steam regulating valve, the second control information for adjusting the water feed amount of the working fluid heat storage system is generated to increase the boiler feed water flow without increasing the heat recovery extraction load of the turbine heat recovery system, thereby releasing the stored energy of the working fluid heat storage system.

[0115] Because the amount of steam required by the turbine will increase during the load increase regulation process, and the opening of the turbine main steam regulating valve directly affects the amount of steam entering the turbine, the first control information of the turbine main steam regulating valve is combined to obtain the amount of feed water that should be supplied to the boiler, and then the second control information for adjusting the feed water amount of the working fluid heat storage system is calculated to accurately control the working fluid heat storage system to increase the feed water flow rate of the boiler, improve the response speed, and make the feed water amount adapt to the high peak regulation rate.

[0116] As an implementation method, in response to the maximum load increase rate of the generator set, third control information for adjusting the water supply of the working fluid heat storage system and fourth control information for adjusting the water supply of the heat recovery system are synchronously generated. In combination with the third control information and the fourth control information, the heat recovery extraction of the turbine heat recovery system is synchronously reduced and the feed water flow of the boiler is increased to release the stored energy of the working fluid heat storage system to the maximum extent. In particular, since the load increase rate of the generator set can be adjusted according to actual needs, when the generator set reaches the maximum load increase rate, the water vapor required by the generator set will also be greater. In order to achieve rapid peak regulation, For high variable load rate, if only the second control information related to the first control information of the main steam regulating valve of the steam turbine is used to control the water feed volume of the working fluid thermal storage system, a lag will occur. Therefore, at this time, the maximum load increase rate of the generator set is read in advance, and the third control information and fourth control information for adjusting the water feed volume of the working fluid thermal storage system are calculated. Optionally, the third control information is used to control the volume change of the volume cavity in the working fluid thermal storage system, the fourth control information is used to adjust the water feed volume of the heat recovery system, and the second control information is used to control the outlet working fluid flow rate of the working fluid thermal storage system. The three control information are combined to achieve rapid peak regulation.

[0117] As an implementation method, after receiving the load increase signal, the opening of the condensate pump and / or the feed water pump is reduced, and the steam extraction of each stage of the turbine unit is reduced. Because the working fluid heat storage system has completed the feed water heat storage before the load is increased, the feed water of the working fluid heat storage system should be the dominant factor when the load is increased. The opening of the condensate pump and / or the feed water pump needs to be reduced, and at this time, the condensate storage device and the deoxygenated water storage device are stored with water and heat to coordinate and complete rapid peak regulation.

[0118] In summary, compared with the prior art, the above embodiments provide a feedwater heat storage type thermal power generator unit regulation system, design method and operation method, which utilizes the working fluid heat storage system to store heat in the high-temperature feedwater or high-temperature drain water output from the high-pressure heat recovery system, and is decoupled or adjustable in coupling degree and arranged between the high-pressure heat recovery system and the boiler. When the load needs to be adjusted quickly, the high-pressure heat recovery system is decoupled from the boiler, and the working fluid heat storage system is used to supply water to the boiler to increase the water feed and heat load. The water feed of the working fluid heat storage system is adjusted in combination with the maximum load increase rate and the maximum load rate adjustment range of the generator set.

[0119] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A water supply thermal storage type thermal power generator unit regulating system, characterized in that: include: The high-pressure heat recovery system is provided with a water supply outlet and a drain outlet, wherein the water supply outlet is connected to the boiler through a water supply pipe; A working medium heat storage system is connected to the water supply outlet or drain outlet via a water inlet pipe and is connected to the water supply pipe via a water outlet pipe; The working fluid heat storage system can be decoupled or arranged between the high-pressure heat recovery system and the boiler with an adjustable coupling degree. The volume of the working fluid heat storage system is determined by the maximum load increase rate of the generator set and the water supply parameters corresponding to the maximum load rate adjustment range.

2. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 1, characterized in that: The working fluid heat storage system comprises a feed water heat storage device, a first control valve, a second control valve and a third control valve; The first control valve is arranged on the water inlet pipe of the water supply heat storage device, and the water inlet pipe is connected to the water supply outlet; The second control valve is arranged on the water outlet pipe of the water supply heat storage device, and the water outlet pipe is connected to the water supply pipe; A third control valve is provided on a bypass of a section of the water supply pipe between the water inlet pipe and the water outlet pipe.

3. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 2, characterized in that: The first control valve, the second control valve and the third control valve are respectively on-off valves or regulating valves.

4. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 1, characterized in that: The working medium heat storage system comprises a water supply heat storage device and a water supply replenishment pump. The water supply replenishment pump is arranged on a water outlet pipe of the water supply heat storage device, and the water outlet pipe is connected to the water supply pipe.

5. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 4, characterized in that: It also includes a steam drum and a high-pressure steam extraction stage. The feedwater heat storage device is connected to the high-pressure steam pipeline between the steam drum and the high-pressure steam extraction stage through a steam extraction pipeline. The steam extraction pipeline is provided with an on-off valve, a regulating valve or a check valve.

6. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 1, characterized in that: The working fluid heat storage system includes a drain heat storage device and a drain pump; The hydrophobic heat storage device is connected to the hydrophobic outlet via the water inlet pipe; The drain pump is arranged on the water outlet pipe of the drain heat storage device, and the water outlet pipe is connected to the water supply pipe.

7. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 6, characterized in that: The water supply outlet of the high-pressure heat recovery system is connected to the hydrophobic heat storage device through a drain valve.

8. A feedwater thermal storage type thermal power generator regulating system according to any one of claims 1 to 6, characterized in that: The working fluid heat storage system is also provided with a heat preservation device, which is used to keep the volume cavity used for storing the working fluid in the working fluid heat storage system warm.

9. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 8, characterized in that: It also includes a condenser and a condensate pump, wherein a condensate storage device is provided between the condenser and the condensate pump, and the inlet and outlet of the condensate storage device and a bypass thereof are respectively provided with a condensate on-off valve or a condensate regulating valve.

10. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 9, characterized in that: The condensate storage device is a normal pressure device and is arranged at a specific height. The condensate inlet thereof is used to pump condensate into the device by means of a condensate storage pump, and the condensate outlet thereof is directly connected to the working fluid heat storage system through a second condensate on-off valve or a second condensate regulating valve.

11. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 8, characterized in that: It also includes a deaerator and a water feed pump, a deoxygenated water storage device is provided between the deaerator and the water feed pump, and the inlet and outlet of the deoxygenated water storage device and its bypass are respectively provided with a deoxygenated water on-off valve or a deoxygenated water regulating valve.

12. A feedwater thermal storage type thermal power generator regulating system as claimed in claim 11, characterized in that: The deoxygenated water storage device is a normal pressure device and is arranged at a specific height. The deoxygenated water inlet is provided with a deoxygenated water storage pump to pump deoxygenated water into the deoxygenated water storage device. Its deoxygenated water outlet is directly connected to the working medium heat storage system through a second deoxygenated water on-off valve or a second deoxygenated water regulating valve.

13. A water supply thermal storage type thermal power generator regulating system as claimed in claim 8, characterized in that: The volume chamber is composed of a variable-volume working medium storage container, and the variable-volume working medium storage container adjusts its variable-volume range according to the load increase rate of the generator set.

14. A method for designing regulation of a feedwater thermal storage type thermal power generator set, applied to a feedwater thermal storage type thermal power generator set regulation system as claimed in any one of claims 1 to 13, characterized in that: include: Set the maximum load increase rate of the generator set to X% rated load / min and set the load rate adjustment range to A% to B%; According to the maximum load increase rate and the set load rate adjustment range, the corresponding water supply mass flow rate under A% load is calculated to be G1 (kg / s), and the corresponding water supply mass flow rate under B% load is calculated to be G2 (kg / s); Assume that the specific volume of the working fluid transported from the working fluid heat storage system through the outlet pipe to the water supply pipe is v1 (m 3 / kg), the volume of the working fluid heat storage system can be determined as 30*(BA)·(G2-G1)·v1 / X·(1±50%).

15. A method for designing and regulating a feedwater thermal storage type thermal power generating set as claimed in claim 14, characterized in that: The feedwater thermal storage type thermal power generator regulating system further comprises a condensate water storage device and / or a deoxygenated water storage device; The outlet working fluid specific volume of the condensate storage device is v2, and the volume of the working fluid heat storage system is 30*(BA)·(G2-G1)·v2 / X·(1±50%); The outlet working fluid specific volume of the deoxygenated water storage device is v3, and the volume of the working fluid heat storage system is 30*(BA)·(G2-G1)·v3 / X·(1±50%).

16. A method for designing regulation of a feedwater thermal storage type thermal power generator set, applied to a feedwater thermal storage type thermal power generator set regulation system as claimed in any one of claims 1 to 13, characterized in that: include: Set the maximum load increase rate of the generator set to X`% rated load / min and set the load rate adjustment range to A`% to B`%, and calculate the corresponding water supply mass flow rate under A`% load as G`1, the corresponding water supply mass flow rate under B`% load as G`2, and determine the minimum water supply mass flow rate as G`0; The heat recovery system feed water flow rapid drop time T1 and the heat recovery system minimum feed water flow duration T2 based on the unit load increase rate and the minimum flow of the heat recovery system; Assuming that the specific volume of the working fluid transported from the working fluid heat storage system through the water outlet pipe to the water supply pipe is v`1, the volume of the working fluid heat storage system is (T1+T2)·(2G`2-G`1-G`0)) / 4)·v`1·(1±50%).

17. A method for designing and regulating a feedwater thermal storage type thermal power generating set as claimed in claim 16, characterized in that: The feedwater thermal storage type thermal power generator regulating system further comprises a condensate water storage device and / or a deoxygenated water storage device; The outlet working fluid specific volume of the condensate storage device is v`2, and the volume of the working fluid heat storage system is (T1+T2)·(2G`2-G`1-G`0)) / 4)·v`2·(1±50%); The outlet working fluid specific volume of the deoxygenated water storage device is v`3, and the volume of the working fluid heat storage system is (T1+T2)·(2G`2-G`1-G`0)) / 4)·v`3·(1±50%).

18. An operating method for a feedwater thermal storage type thermal power generator regulating system as claimed in any one of claims 1 to 13, characterized in that: include: receiving a load increase signal and utilizing a working fluid heat storage system to decouple the high pressure heat recovery system from the boiler; Combined with the first control information of the turbine main steam regulating valve, the second control information for adjusting the feed water amount of the working fluid heat storage system is generated to increase the feed water flow of the boiler and release the stored energy of the working fluid heat storage system without increasing the heat recovery extraction load of the turbine heat recovery system.

19. The operating method according to claim 18, characterized in that: In response to the maximum load increase rate of the generator set, third control information for adjusting the water feed amount of the working fluid heat storage system and fourth control information for adjusting the water feed amount of the heat recovery system are synchronously generated. Combined with the third control information and the fourth control information, the heat recovery extraction of the turbine heat recovery system is synchronously reduced and the feed water flow of the boiler is increased to maximize the release of the energy stored in the working fluid heat storage system.

20. The operating method according to claim 19, characterized in that: After receiving the load increase signal, the flow rate of the condensate pump and / or the feed water pump is reduced to reduce the steam extraction of each stage of the steam turbine unit.

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