CN113154354A - Load control system and method for supercritical heat supply unit - Google Patents

Load control system and method for supercritical heat supply unit Download PDF

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Publication number
CN113154354A
CN113154354A CN202110383980.8A CN202110383980A CN113154354A CN 113154354 A CN113154354 A CN 113154354A CN 202110383980 A CN202110383980 A CN 202110383980A CN 113154354 A CN113154354 A CN 113154354A
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steam
heat
extraction
heat supply
load
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王邦行
赵志丹
李�杰
曲广浩
张涵超
郝德峰
张瑞祥
张海龙
刘孝国
周昭亮
刘欢
文怀周
张靖
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/18—Applications of computers to steam boiler control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

The invention discloses a load control system and method for a supercritical heat supply unit. Because the requirement on steam parameters of heating and steam extraction is not high, a steam source is usually extracted from a steam exhaust position of a steam turbine intermediate pressure cylinder, the extracted steam enters a heat supply heat exchanger, exchanges heat with a cold working medium of a heat supply network user, enters a condenser through a drain pipe, and reenters thermodynamic cycle through a condensate pump. In order to ensure the steam extraction pressure, a communicating pipe pressure regulating valve is arranged on a communicating pipe from the steam extraction of the intermediate pressure cylinder to the inlet of the low pressure cylinder to regulate the steam extraction pressure. And a pressure regulating valve is arranged on the side of the heating steam extraction pipeline and used for regulating the steam flow of the hot working medium of the heat supply network heat exchanger when the demand of a hot user changes.

Description

Load control system and method for supercritical heat supply unit
Technical Field
The invention belongs to the technical field of automatic control of thermal power plants, and particularly relates to a load control system and method for a supercritical heat supply unit.
Background
In recent years, the proportion of heat supply units in installed capacity is gradually increased, and the situation that large supercritical units are adopted as heating units is increasing. The supercritical (super) unit has large capacity, high parameters and high thermal efficiency of the whole plant, and can play the roles of energy conservation, environmental protection and emission reduction compared with the conventional cogeneration unit.
Compared with an industrial steam extraction system, the heating steam extraction heat supply system has the characteristics of the heating steam extraction heat supply system. The purpose is to warm for residents and urban utilities, so the requirement on steam extraction parameters is not high, and the steam exhausted from a steam turbine intermediate pressure cylinder is usually used as a steam source. Has obvious seasonality, great annual change and small daily change.
Because the requirement on steam parameters of heating and steam extraction is not high, a steam source is usually extracted from a steam exhaust position of a steam turbine intermediate pressure cylinder, the extracted steam enters a heat supply heat exchanger, exchanges heat with a cold working medium of a heat supply network user, enters a condenser through a drain pipe, and reenters thermodynamic cycle through a condensate pump. In order to ensure the steam extraction pressure, a communicating pipe pressure regulating valve is arranged on a communicating pipe from the steam extraction of the intermediate pressure cylinder to the inlet of the low pressure cylinder to regulate the steam extraction pressure.
When the steam extraction pressure needs to be reduced, the opening degree of the pressure regulating valve of the communicating pipe is increased, so that more steam exhausted by the intermediate pressure cylinder enters the low pressure cylinder to do work. When the steam extraction pressure needs to be improved, the opening degree of the pressure regulating valve of the communicating pipe is reduced, so that more middle pressure cylinder steam exhausts enter a steam extraction system to heat a heat supply network user. Meanwhile, in order to ensure the minimum steam flow of the low-pressure cylinder, when the inlet pressure of the low-pressure cylinder is low, the adjusting door is locked and the valve is closed to be small, so that the safety of the low-pressure cylinder blade is ensured. And a pressure regulating valve is arranged on the side of the heating steam extraction pipeline and used for regulating the steam flow of the hot working medium of the heat supply network heat exchanger when the demand of a hot user changes.
Because the heating heat supply type unit extracts partial steam from the exhaust steam of the intermediate pressure cylinder for heating, the partial steam can be influenced to enter the low pressure cylinder for acting, thereby causing mismatching between the electric load and the heat load of the unit; if the unit electrical load is still used as a reference for unit coordination control at this time, energy imbalance between boiler energy and steam turbine requirements is inevitably caused, so that imbalance of important parameters such as load, temperature and pressure is caused, the safe and stable operation of the unit is further influenced, and the quick response requirement of a power grid AGC on the unit load cannot be met.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a load control system and a method for a supercritical heat supply unit.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a load control system of a supercritical heat supply unit comprises:
the exhaust steam of the boiler enters a high-medium pressure cylinder to do work, and the exhaust steam after doing work enters a low-pressure cylinder to exhaust steam;
the exhaust steam of the low-pressure cylinder returns to the boiler after sequentially passing through a condenser, a condensate pump, a low-pressure heater, a deaerator, a feed pump and a high-pressure heater;
and a heat source of the heat supply network heat exchanger is from partial exhaust steam of the high and medium pressure cylinder, and is conveyed to an inlet of the condensate pump after heat exchange.
The invention further improves the following steps:
and one part of the exhaust steam of the high and medium pressure cylinders enters the low pressure cylinder through the communicating pipe pressure regulating valve, and the other part of the exhaust steam enters the heat supply network heat exchanger through the steam extraction pressure regulating valve in sequence.
And a heat supply steam extraction check valve is arranged at the inlet of the steam extraction pressure regulating valve.
A load control method for a supercritical heat supply unit comprises the following steps:
step 1, calculating the parameter heat of extracted steam;
step 2, when the load of the unit changes or the demand of a heat supply network user changes, calculating the heating heat by using the steam parameter;
step 3, when the steam extraction flow or the drainage quantity is not accurately measured, calculating the heat quantity by using the inlet water temperature and the outlet water flow of the heat supply network user side;
step 4, converting the calculated steam extraction heat into thermal power;
step 5, converting the thermal power into electric power;
step 6, delaying for 20s when the heat supply steam extraction check valve is closed or the instruction of the steam extraction pressure regulating valve is less than 5%; when the heating and power supply load is calculated to have bad quality, the calculation load is locked;
step 7, when the calculated thermoelectric load change is smaller than a set value, keeping the current value; when the load calculation value changes to be larger than a set value, outputting a tracking actual calculation value; increasing speed limit, inertia and high-low amplitude limiting links to finally obtain the heating electric load required by coordination control;
and 8, adding the calculated heat supply electric load into coordinated control according to the calculated heat supply electric load, so that the boiler heat is matched with the requirement of the steam turbine, and the electric load of the generator is consistent with the heat load of the steam turbine.
The method of the invention is further improved in that:
in the step 1, the parameter heat of the extracted steam is calculated according to the following formula:
qr＝(Ts-T0)Cps+r+(T0-Tw)CpwQm
wherein q isrFor calculating the heat of extraction, TsIs the temperature of extraction, T0Is the saturation temperature at the extraction pressure, CpsIs the specific heat capacity of steam at constant pressure under the extraction pressure, r is the latent heat of vaporization of water vapor, TwIs the hydrophobic temperature, CpwIs the specific heat capacity of water, QmIs the extraction mass flow.
In the step 2, the steam parameters comprise heating extraction flow, pressure and temperature.
In the step 3, when the measurement of the extraction flow or the drainage quantity is inaccurate, the heat quantity is calculated according to the following formula:
qr＝(T1-T2)CpwQm
wherein q isrFor calculating the heat of extraction, T1For the side outlet temperature, T, of the heat supply network2Temperature of the side inlet water for the user of the heat supply network, CpwIs the specific heat capacity of water, QmThe water mass flow of the user side of the heat supply network.
In the step 4, the method for converting the calculated extraction heat into the thermal power is as follows:
Prl＝1000qr/3600＝0.278qr
wherein, PrlTo calculate thermal power, MW.
In step 5, the method for converting thermal power into electric power is as follows:
Pr＝K×ηLP×Prl
wherein, PrlTo calculate thermal power; prCalculating the thermoelectric power of the extracted steam; etaLPLow cylinder efficiency; k is a correction coefficient.
Compared with the prior art, the invention has the following beneficial effects:
the invention aims at a supercritical heat supply unit, takes the aspects of heating extraction steam heat quantity calculation, heating power load calculation, unit load control optimization (a boiler main control loop, a main steam pressure generation loop, a fuel correction loop) and the like into consideration, correspondingly modifies a load control loop on the premise of ensuring accurate heat supply load calculation, and meets the requirement of timely response of a unit coordination system when steam extraction changes. And according to the actual operation condition, a calculation method of the heat supply steam extraction load is reasonably selected, so that the size of the heat supply load is accurately calculated, and the stable operation of the unit coordination control is ensured.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a diagram of a heating and heating steam extraction system.
FIG. 2 is a logic diagram of a thermoelectric load generation circuit.
Fig. 3 shows a heat supply unit load control optimization logic diagram.
Wherein: 1-boiler, 2-high and medium pressure cylinder, 3-low pressure cylinder, 4-condenser, 5-condensate pump, 6-low pressure heater, 7-deaerator, 8-water supply pump, 9-high pressure heater, 10-heat network heat exchanger, 11-communicating pipe pressure regulating valve, 12-heat supply steam extraction check valve, 13-steam extraction pressure regulating valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the embodiment of the invention discloses a load control system of a supercritical heat supply unit, which comprises a high and medium pressure cylinder 2, a steam extraction pressure regulating valve 13, a heat supply network heat exchanger 10, a steam turbine low pressure cylinder 3 and a communicating pipe pressure regulating valve 11. Because the requirement on steam parameters of heating and steam extraction is not high, a steam source is usually extracted from a steam exhaust position of a steam turbine intermediate pressure cylinder, the extracted steam enters a heat supply heat exchanger, exchanges heat with a cold working medium of a heat supply network user, enters a condenser 4 through a drain pipeline, and enters thermodynamic cycle again through a condensate pump 5. In order to ensure the steam extraction pressure, a communicating pipe pressure regulating valve 11 is arranged on a communicating pipe for exhausting steam from the intermediate pressure cylinder to the inlet of the low pressure cylinder 3 to regulate the steam extraction pressure. And a pressure regulating valve is arranged on the side of the heating steam extraction pipeline and used for regulating the steam flow of the hot working medium of the heat supply network heat exchanger 10 when the demand of a heat user changes.
The invention adopts heating extraction steam parameter calculation, and a general unit is provided with a flow nozzle behind an extraction regulating valve, and the flow nozzle is used for measuring the flow, the temperature and the pressure of heating extraction steam. Therefore, the extraction heat can be calculated through the heating extraction steam parameters. When the load of the unit changes or the demand of a user of a heat supply network changes, the flow, pressure and temperature of heating extraction steam all change rapidly, heating heat calculation is carried out by using the steam parameters, the change condition of the heat load of the extraction steam can be reflected timely and accurately, timely response of the water, coal, air and other sub-circuits of the boiler 1 is ensured, and stable operation of the unit is ensured. When the measurement of the steam extraction pressure is inaccurate or no measuring point exists, the drainage quantity of the heat supply network heater can be adopted for calculation.
After the heating steam extraction heat is calculated, the heating steam extraction heat needs to be converted into an electric load unit, and corresponding judgment switching logic is added to ensure the reality and effectiveness of the heat calculation.
And adding the calculated heat supply electric load into coordinated control to ensure that the heat of the boiler 1 is matched with the requirement of a steam turbine, and the electric load of the generator is consistent with the heat load of the steam turbine.
The supercritical coal-fired unit with the heat supply and steam extraction functions has the advantages that the heat supply load changes slowly, the load control loop is correspondingly modified on the premise of ensuring the heat supply load to be calculated accurately, and the requirement of timely response of a unit coordination system when steam extraction changes can be met. According to the actual operation condition, a calculation method of the heat supply steam extraction load is reasonably selected, so that the size of the heat supply load is accurately calculated, and the key for ensuring the stable operation of the unit coordination control is realized.
The invention adopts heating extraction steam parameter calculation, and a general unit is provided with a flow nozzle behind an extraction regulating valve, and the flow nozzle is used for measuring the flow, the temperature and the pressure of heating extraction steam. Therefore, the extraction heat can be calculated through the heating extraction steam parameters. The heat formula for calculating the steam extraction parameters is as follows:
qr＝(Ts-T0)Cps+r+(T0-Tw)CpwQm
wherein q isrFor calculating the heat of extraction, TsIs the temperature of extraction, T0Is the saturation temperature at the extraction pressure, CpsIs the specific heat capacity of steam at constant pressure under the extraction pressure, r is the latent heat of vaporization of water vapor, TwIs the hydrophobic temperature, CpwIs the specific heat capacity of water, QmIs the extraction mass flow.
When the load of the unit changes or the demand of a user of a heat supply network changes, the flow, pressure and temperature of heating extraction steam all change rapidly, heating heat calculation is carried out by using the steam parameters, the change condition of the heat load of the extraction steam can be reflected timely and accurately, timely response of the water, coal, air and other sub-circuits of the boiler 1 is ensured, and stable operation of the unit is ensured. When the measurement of the steam extraction pressure is inaccurate or no measuring point exists, the drainage quantity of the heat supply network heater can be adopted for calculation. And when the heat supply network cold working medium parameter is adopted to calculate the stable state of the heat supply network system, the heat consumed by the heat supply network for steam extraction is equal to the heat absorption capacity of the user side cold working medium. Therefore, when the steam extraction flow or the drainage quantity is measured inaccurately, the temperature and the flow of the inlet water at the user side of the heat supply network can be used for heat calculation. The calculation formula is as follows:
qr＝(T1-T2)CpwQm
wherein q isrFor calculating the heat of extraction, T1For the side outlet temperature, T, of the heat supply network2Temperature of the side inlet water for the user of the heat supply network, CpwIs the specific heat capacity of water, QmThe water mass flow of the user side of the heat supply network.
The heat of extraction calculated by the above formula is an energy unit, and it needs to be converted into a power unit. The conversion formula is as follows:
Prl＝1000qr/3600＝0.278qr
wherein q isrFor calculating the heat of extraction, GJ/h; prlTo calculate thermal power, MW.
Since the heating extraction steam is extracted from the steam exhaust position of the middle pressure cylinder, the part of steam does not enter the low pressure cylinder 3 to do work, and therefore the heat power calculated in the above formula needs to be converted into electric power. The conversion formula is as follows:
Pr＝K×ηLP×Prl。
wherein, PrlTo calculate thermal power, MW; prFor calculating the extraction thermoelectric power, MW; etaLPThe efficiency of the low-pressure cylinder 3 can be obtained by the specification of a steam turbine; k is a correction coefficient and can be obtained by comparison calculation according to two working conditions of non-heat supply and heat supply of the on-site unit.
The heat supply load is calculated by measuring points such as working medium flow, temperature and pressure, the influence factors are more, and the flow fluctuation of the water side is more frequent, so that corresponding logic judgment is needed, and the heat supply load calculation is real and effective. The specific logic is shown in figure 2.
When the heating steam extraction check valve 12 is closed or the command of the steam extraction pressure regulating valve 13 is less than 5%, delaying for 20s, and considering that the heating steam extraction loop is cut off at the moment, and the heating electric load is cut to 0 from the calculated value. When the heating and power supply load is calculated to have bad quality, the calculation load is locked, and load fluctuation caused by inaccurate measuring points is avoided.
Because the control scheme aims at heating heat load, the daily change amplitude is small, the large fluctuation of the calculated electric load caused by measuring point disturbance is avoided, and the load calculation locking function is added. When the calculated thermoelectric load change is small, the current value is kept, and the system is kept stable. When the load calculation value changes greatly, a tracking actual calculation value is output, and the accuracy of a calculation result is ensured. In order to avoid the fluctuation of the calculated measuring point and the large measuring error, the links of speed limit, inertia and high and low amplitude limiting are added, and finally the heating and power load required by the coordination control is obtained.
According to the calculated heat supply electric load, the heat supply electric load is added into the coordination control, the heat of the boiler 1 is ensured to be matched with the requirement of a steam turbine, the electric load of the generator is consistent with the heat load of the steam turbine, and the specific logic is shown in figure 3.
(1) Boiler 1 main control loop. When the heat supply steam extraction electric load changes, the energy change of the boiler 1 is directly required, so the calculated load is superposed into the main control instruction feedforward of the boiler 1, and the corresponding increase and decrease of sub-circuits such as wind, coal, water and the like are ensured, thereby ensuring the timely response of the boiler 1 when the heat supply load changes.
(2) A main steam pressure generating circuit. Due to the generation of heat supply extraction steam, the steam inlet quantity of the steam turbine is increased, and deviation is generated with actual electric load. If still according to original sliding pressure curve operation this moment, can lead to the main vapour pressure to hang down excessively, the accent door aperture is too big, has reduced unit economic nature to influence safety. Therefore, the sliding pressure curve of the steam turbine with the heating and power load superposition value needs to be generated into a loop, and the main steam pressure of the unit is ensured to be normal.
(3) A fuel correction circuit (BTU). The fuel correction loop adjusts the fuel correction coefficient according to the difference between the current load design coal quantity and the actual coal quantity, thereby realizing the coordination control self-adaption function when the coal type changes. Therefore, the heating power load needs to be superposed in the design coal amount calculation loop, and the adjustment accuracy of the fuel correction loop is ensured.
The supercritical coal-fired unit with the heat supply and steam extraction functions has the advantages that the heat supply load changes slowly, the load control loop is correspondingly modified on the premise of ensuring the heat supply load to be calculated accurately, and the requirement of timely response of a unit coordination system when steam extraction changes can be met. According to the actual operation condition, a calculation method of the heat supply steam extraction load is reasonably selected, so that the size of the heat supply load is accurately calculated, and the key for ensuring the stable operation of the unit coordination control is realized.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A load control system of a supercritical heat supply unit is characterized by comprising:
the steam exhaust of the boiler (1) enters a high and medium pressure cylinder (2) to do work, and the steam exhaust after doing work enters a low pressure cylinder (3) to exhaust steam;
the low-pressure steam generator comprises a low-pressure cylinder (3), wherein exhaust steam of the low-pressure cylinder (3) returns to a boiler (1) after sequentially passing through a condenser (4), a condensate pump (5), a low-pressure heater (6), a deaerator (7), a water feed pump (8) and a high-pressure heater (9);
and a heat source of the heat supply network heat exchanger (10) is from partial exhaust steam of the high and medium pressure cylinder (2), and the heat is transferred to an inlet of the condensate pump (5).
2. The load control system of the supercritical heat supply unit according to claim 1, characterized in that a part of the exhaust steam of the high and medium pressure cylinder (2) enters the low pressure cylinder (3) through the communicating pipe pressure regulating valve (11), and the other part enters the heat network heat exchanger (10) through the steam extraction pressure regulating valve (13) in turn.
3. The load control system of a supercritical heat supply unit according to claim 2 characterized in that the inlet of the extraction pressure regulating valve (13) is provided with a heating extraction check valve (12).
4. A load control method of a supercritical heating unit using the system according to any one of claims 1 to 3, characterized by comprising the steps of:
step 1, calculating the parameter heat of extracted steam;
step 2, when the load of the unit changes or the demand of a heat supply network user changes, calculating the heating heat by using the steam parameter;
step 3, when the steam extraction flow or the drainage quantity is not accurately measured, calculating the heat quantity by using the inlet water temperature and the outlet water flow of the heat supply network user side;
step 4, converting the calculated steam extraction heat into thermal power;
step 5, converting the thermal power into electric power;
step 6, delaying for 20s when the heat supply steam extraction check valve (12) is closed or the instruction of the steam extraction pressure regulating valve (13) is less than 5%; when the heating and power supply load is calculated to have bad quality, the calculation load is locked;
step 7, when the calculated thermoelectric load change is smaller than a set value, keeping the current value; when the load calculation value changes to be larger than a set value, outputting a tracking actual calculation value; increasing speed limit, inertia and high-low amplitude limiting links to finally obtain the heating electric load required by coordination control;
and 8, adding the calculated heat supply electric load into coordinated control according to the calculated heat supply electric load, so that the heat of the boiler (1) is matched with the requirement of a steam turbine, and the electric load of the generator is consistent with the heat load of the steam turbine.
5. The load control method for the supercritical heat supply unit according to claim 4, wherein in the step 1, the parameter heat of the extracted steam is calculated according to the following formula:
qr＝(Ts-T0)Cps+r+(T0-Tw)CpwQm
wherein q isrFor calculating the heat of extraction, TsIs the temperature of extraction, T0Is the saturation temperature at the extraction pressure, CpsIs the specific heat capacity of steam at constant pressure under the extraction pressure, r is the latent heat of vaporization of water vapor, TwIs the hydrophobic temperature, CpwIs the specific heat capacity of water, QmIs the extraction mass flow.
6. The load control method for the supercritical heat supply unit according to claim 4, wherein in the step 2, the steam parameters include heating extraction flow rate, pressure and temperature.
7. The load control method for the supercritical heating unit according to claim 4, wherein in the step 3, when the measurement of the extraction steam flow or the drainage water amount is inaccurate, the heat amount is calculated according to the following formula:
qr＝(T1-T2)CpwQm
wherein q isrFor calculating the heat of extraction, T1For the side outlet temperature, T, of the heat supply network2Temperature of the side inlet water for the user of the heat supply network, CpwIs the specific heat capacity of water, QmThe water mass flow of the user side of the heat supply network.
8. The load control method for the supercritical heat supply unit according to claim 4, wherein in the step 4, the method for converting the calculated extraction steam heat into the thermal power is as follows:
Prl＝1000qr/3600＝0.278qr
wherein, PrlTo calculate thermal power, MW.
9. The load control method for the supercritical heating unit according to claim 4, wherein in step 5, the method for converting the thermal power into the electric power is as follows:
Pr＝K×ηLP×Prl
wherein, PrlTo calculate thermal power; prCalculating the thermoelectric power of the extracted steam; etaLPLow cylinder efficiency; k is a correction coefficient.
CN202110383980.8A 2021-04-09 2021-04-09 Load control system and method for supercritical heat supply unit Pending CN113154354A (en)

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Application Number Priority Date Filing Date Title
CN202110383980.8A CN113154354A (en) 2021-04-09 2021-04-09 Load control system and method for supercritical heat supply unit

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Publication Number Publication Date
CN113154354A true CN113154354A (en) 2021-07-23

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