CN116771451A - Supercritical carbon dioxide heating expansion system - Google Patents

Supercritical carbon dioxide heating expansion system Download PDF

Info

Publication number
CN116771451A
CN116771451A CN202310803018.4A CN202310803018A CN116771451A CN 116771451 A CN116771451 A CN 116771451A CN 202310803018 A CN202310803018 A CN 202310803018A CN 116771451 A CN116771451 A CN 116771451A
Authority
CN
China
Prior art keywords
carbon dioxide
supercritical carbon
turbine
regulating valve
turbine inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310803018.4A
Other languages
Chinese (zh)
Inventor
劳星胜
宋苹
林原胜
赵振兴
柯志武
柯汉兵
李献领
廖梦然
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
719th Research Institute Of China State Shipbuilding Corp
Original Assignee
719th Research Institute Of China State Shipbuilding Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 719th Research Institute Of China State Shipbuilding Corp filed Critical 719th Research Institute Of China State Shipbuilding Corp
Priority to CN202310803018.4A priority Critical patent/CN116771451A/en
Publication of CN116771451A publication Critical patent/CN116771451A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K21/00—Steam engine plants not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Control Of Turbines (AREA)

Abstract

The invention relates to the technical field of supercritical carbon dioxide power systems, and provides a supercritical carbon dioxide heating expansion system which comprises a supercritical carbon dioxide heater, a supercritical carbon dioxide turbine, a turbine inlet regulating valve, a turbine propulsion motor, a plurality of densimeters, a plurality of pressure sensors and a data processing unit. Each densimeter and each pressure sensor are inserted on the working medium channel of the supercritical carbon dioxide heater and are provided with a measuring end which is in direct contact with the supercritical carbon dioxide fluid. The data processing unit receives signals transmitted by the plurality of densimeters and the pressure sensors through the cables, accurately predicts the flow and heat transfer performance of the supercritical carbon dioxide heater according to a preset supercritical carbon dioxide physical property table, sends a rotating speed control signal to the turbine propulsion motor according to a prediction result, and sends an opening control signal to the turbine inlet regulating valve, so that the system stability and thermodynamic cycle efficiency of the supercritical carbon dioxide heating expansion system are remarkably improved.

Description

Supercritical carbon dioxide heating expansion system
Technical Field
The invention relates to the technical field of supercritical carbon dioxide power systems, in particular to a supercritical carbon dioxide heating expansion system.
Background
Supercritical carbon dioxide is very suitable for heat exchange working media of compact heaters because of the characteristic of high density viscosity ratio. However, as the thermal physical properties of the supercritical carbon dioxide under the conditions of different thermal physical parameters change rapidly, the disturbance caused by the structural mutation in the heater can cause unstable working performance of the heater, and the method has important significance for accurately grasping the thermal physical properties of working media in the heater and formulating a stable and efficient control strategy of the supercritical carbon dioxide heating expansion system.
Disclosure of Invention
First, the technical problem to be solved
The invention provides a supercritical carbon dioxide heating expansion system, which is used for solving the problem that the working performance of a heater and a turbine is unstable due to disturbance caused by abrupt structural change in the heater due to rapid change of thermal physical properties of supercritical carbon dioxide under different thermal physical parameter conditions, and achieving the purpose of improving the stability and thermodynamic cycle efficiency of the supercritical carbon dioxide heating expansion system.
(II) technical scheme
A supercritical carbon dioxide heating expansion system comprising: the system comprises a supercritical carbon dioxide heater, a supercritical carbon dioxide turbine, a turbine inlet regulating valve, a turbine propulsion motor, a flowmeter, a densimeter, a pressure sensor and a data processing unit.
The supercritical carbon dioxide heater is provided with a heat source channel and a working medium channel;
the rotating shaft of the supercritical carbon dioxide turbine is connected with the motor shaft of the turbine propulsion motor through a coupler, and the rotating speed of the supercritical carbon dioxide turbine is the same as that of the turbine propulsion motor;
the flowmeter is arranged between the working medium channel outlet of the supercritical carbon dioxide heater and the turbine inlet regulating valve, is connected with the outlet of the supercritical carbon dioxide heater and the inlet of the turbine inlet regulating valve through pipelines respectively, and is provided with a cable end for outputting measurement data;
the number of the densimeter and the pressure sensor is more than or equal to 2, each densimeter and each pressure sensor are inserted into a working medium channel of the supercritical carbon dioxide heater, and each densimeter and each pressure sensor are provided with a measuring end and a cable end;
the data processing unit is internally preset with a supercritical carbon dioxide thermophysical property table, a supercritical carbon dioxide flow heat exchange calculation program, a turbine inlet regulating valve characteristic table and a supercritical carbon dioxide turbine characteristic table, receives supercritical carbon dioxide density data transmitted by a densimeter and supercritical carbon dioxide pressure data transmitted by a pressure sensor, calculates and obtains a supercritical carbon dioxide heater working medium channel outlet thermophysical parameter, sends an opening control signal to a turbine inlet regulating valve, and sends a rotating speed control signal to a turbine propulsion motor;
the data processing unit is provided with a data acquisition end which is connected with the cable end of the densimeter and the cable end of the pressure sensor through cables, and a signal output end which is connected with the wiring terminal of the turbine inlet regulating valve and the wiring terminal of the turbine propulsion motor through cables;
the heat source channel of the supercritical carbon dioxide heater is filled with high-temperature fluid, the working medium channel is filled with supercritical carbon dioxide, and the working medium channel outlet is connected with the flowmeter inlet through a pipeline;
the measuring end of each densimeter and each pressure sensor is in direct contact with the flowing medium in the working medium channel, and the cable end is connected with the data processing unit through a cable;
the supercritical carbon dioxide thermophysical parameter of the working medium channel outlet of the supercritical carbon dioxide heater changes along with the opening degree change of the turbine inlet regulating valve;
the supercritical carbon dioxide thermophysical property table preset by the data processing unit describes the relation among parameters such as the density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and heat conductivity of the supercritical carbon dioxide fluid, and the values of all the parameters such as the density, the pressure, the temperature, the specific heat, the specific enthalpy, the dynamic viscosity and the heat conductivity can be obtained according to the values of any two parameters such as the density, the pressure, the temperature, the specific heat, the specific enthalpy, the dynamic viscosity and the heat conductivity;
the supercritical carbon dioxide flowing heat exchange calculation program preset by the data processing unit can calculate the numerical values of parameters such as the speed, the density, the pressure, the temperature, the specific heat, the dynamic viscosity, the heat conductivity and the like of the supercritical carbon dioxide fluid at the outlet of the working medium channel according to the thermal physical parameters of the high-temperature fluid and the numerical values of the thermal physical parameters of the supercritical carbon dioxide fluid at the outlet of the working medium channel such as the flow rate, the density, the pressure, the temperature, the specific heat, the dynamic viscosity, the heat conductivity and the like;
the data processing unit is used for presetting a supercritical carbon dioxide turbine characteristic table to describe the relation among the rotating speed and the efficiency of the supercritical carbon dioxide turbine, the supercritical carbon dioxide flow, the density, the pressure, the temperature, the specific heat, the specific enthalpy, the dynamic viscosity, the heat conductivity and other thermal physical parameters of a working medium channel outlet, the efficiency of the supercritical carbon dioxide turbine can be obtained according to the thermal physical parameters of the supercritical carbon dioxide at the supercritical carbon dioxide turbine inlet and the rotating speed of the supercritical carbon dioxide turbine, when the thermal physical parameters of the supercritical carbon dioxide at the supercritical carbon dioxide turbine inlet are fixed, the rotating speed of the supercritical carbon dioxide turbine corresponding to the optimal efficiency can be calculated according to the supercritical carbon dioxide turbine characteristic table, and when the rotating speed of the supercritical carbon dioxide turbine is fixed, the thermal physical parameters of the supercritical carbon dioxide at the supercritical carbon dioxide turbine inlet corresponding to the optimal efficiency can be calculated according to the supercritical carbon dioxide turbine characteristic table;
the data processing unit is used for presetting a turbine inlet regulating valve characteristic table which describes the relation between the opening of a turbine inlet regulating valve and the thermal physical parameters such as the supercritical carbon dioxide flow rate, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, heat conductivity coefficient and the like of the inlet of the turbine inlet regulating valve, obtaining the thermal physical parameters of the supercritical carbon dioxide of the outlet of the turbine inlet regulating valve according to the thermal physical parameters of the supercritical carbon dioxide of the inlet of the turbine inlet regulating valve and the opening of the turbine inlet regulating valve, and calculating the opening of the turbine inlet regulating valve corresponding to the optimal efficiency of the supercritical carbon dioxide turbine according to the turbine inlet regulating valve characteristic table when the thermal physical parameters of the supercritical carbon dioxide of the inlet of the turbine inlet regulating valve are fixed;
the opening degree of the turbine inlet regulating valve is controlled by an opening degree control signal output by a signal output end of the data processing unit, and the rotating speed of the turbine propulsion motor is controlled by a rotating speed control signal output by a signal output end of the data processing unit.
(III) technical effects
The data processing unit receives signals transmitted by the plurality of densimeters and the pressure sensors through cables, the flow and heat transfer performance of the supercritical carbon dioxide heater is accurately predicted by a supercritical carbon dioxide flow heat exchange calculation program according to a preset supercritical carbon dioxide thermophysical property table, a rotating speed control signal is sent to a turbine propulsion motor according to a prediction result, an opening control signal is sent to a turbine inlet regulating valve, the supercritical carbon dioxide turbine is enabled to operate at an optimal efficiency working point, and the system stability and thermodynamic cycle efficiency of the supercritical carbon dioxide heating expansion system are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a supercritical carbon dioxide heating expansion system provided by an embodiment of the present invention;
in the figure: 1-supercritical carbon dioxide heater, 2-supercritical carbon dioxide turbine, 3-turbine inlet regulating valve, 4-turbine propulsion motor, 5-flowmeter, 61-first densitometer, 62-second densitometer, 71-first pressure sensor, 72-second pressure sensor, 8-data processing unit, 9-coupler, 11-heat source channel, 12-working medium channel, 31-turbine inlet regulating valve wiring terminal, 42-turbine propulsion motor wiring terminal, 51-flowmeter cable end, 611-first densitometer measuring end, 612-first densitometer cable end, 621-second densitometer measuring end, 622-second densitometer cable end, 711-first pressure sensor measuring end, 712-first pressure sensor cable end, 721-second pressure sensor measuring end, 722-second pressure sensor cable end, 811-first data acquisition end, 812-second data acquisition end, 813-third data acquisition end, 814-fourth data acquisition end, 815-fifth data acquisition end.
FIG. 2 is a schematic diagram of a workflow of a data processing unit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "thermophysical properties", "pipe", "connection" are to be understood in a broad sense, for example, "connection" may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The supercritical carbon dioxide heating expansion system provided in the embodiment of the present invention is described below with reference to fig. 1, and includes: a supercritical carbon dioxide heater 1, a supercritical carbon dioxide turbine 2, a turbine inlet regulating valve 3, a turbine propulsion motor 4, a flow meter 5, a first densitometer 61, a second densitometer 62, a first pressure sensor 71, a second pressure sensor 72, a data processing unit 8.
The supercritical carbon dioxide heater 1 is provided with a heat source channel 11 and a working medium channel 12;
the inlet of the supercritical carbon dioxide turbine 2 is connected with the outlet of the turbine inlet regulating valve 3 through a pipeline;
the rotating shaft 21 of the supercritical carbon dioxide turbine 2 is connected with the motor shaft 41 of the turbine propulsion motor 4 through the coupler 9, and the rotating shaft 21 of the supercritical carbon dioxide turbine 2 and the motor shaft 41 of the turbine drive 4 have the same rotating speed;
the flowmeter 5 is arranged between the outlet of the working medium channel 12 of the supercritical carbon dioxide heater 1 and the turbine inlet regulating valve 3, and the flowmeter 5 is connected with the outlet of the working medium channel 12 of the supercritical carbon dioxide heater 1 and the inlet of the turbine inlet regulating valve 3 through pipelines;
the first densimeter 61, the second densimeter 62 and the first pressure sensor 71, the second pressure sensor 72 are all inserted on the working medium channel 12 of the supercritical carbon dioxide heater 1, the first densimeter 61 is provided with a first densimeter measuring end 611 and a first densimeter cable end 612, the second densimeter 62 is provided with a second densimeter measuring end 621 and a second densimeter cable end 622, the first pressure sensor 71 is provided with a first pressure sensor measuring end 711 and a first pressure sensor cable end 712, and the second pressure sensor 72 is provided with a second pressure sensor measuring end 721 and a second pressure sensor cable end 722;
the first data acquisition end 811 of the data processing unit 8 is connected by a cable to the cable end 612 of the densitometer 61, the second data acquisition end 812 is connected by a cable to the cable end 622 of the densitometer 62, the third data acquisition end 813 is connected by a cable to the cable end 712 of the pressure sensor 71, the fourth data acquisition end 814 is connected by a cable to the cable end 722 of the pressure sensor 72, the fifth data acquisition end 815 is connected by a cable to the flow meter cable end 51;
the first signal output terminal 821 of the data processing unit 8 is connected to the turbine inlet adjustment valve connection terminal 31 through a cable, outputs an opening degree control signal for controlling the opening degree of the turbine inlet adjustment valve 3 to the turbine inlet adjustment valve 3, and the second signal output terminal 822 is connected to the turbine propulsion motor connection terminal 42 through a cable, and outputs a rotation speed control signal for controlling the rotation speed of the turbine propulsion motor 4 to the turbine propulsion motor 4.
The data processing unit 8 is internally preset with a supercritical carbon dioxide thermophysical property table, a supercritical carbon dioxide flow heat exchange calculation program and a supercritical carbon dioxide turbine characteristic table, receives supercritical carbon dioxide density data transmitted by the first densimeter 61 and the second densimeter 62 and the first pressure sensor 71, calculates and obtains the thermophysical parameters of the outlet of the working medium channel 12 of the supercritical carbon dioxide heater 1 after the supercritical carbon dioxide pressure data transmitted by the second pressure sensor 72, sends an opening control signal to the turbine inlet regulating valve 3, and sends a rotating speed control signal to the turbine propulsion motor;
the heat source channel 11 of the supercritical carbon dioxide heater 1 is filled with high-temperature fluid, the working medium channel 12 is filled with supercritical carbon dioxide, and the outlet of the working medium channel 12 is connected with the inlet of the flowmeter 5 through a pipeline;
the first densimeter measuring end 611, the second densimeter measuring end 621, the first pressure sensor measuring end 711 and the second pressure sensor measuring end 721 are in direct contact with supercritical carbon dioxide flowing through the medium in the working medium channel 12;
the supercritical carbon dioxide thermophysical parameters of the outlet of the working medium channel 12 are changed along with the change of the opening degree of the turbine inlet regulating valve 3, the opening degree of the turbine inlet regulating valve 3 is different, the supercritical carbon dioxide thermophysical parameters of the outlet of the working medium channel 12 are also different, and the specific relation between the opening degree and the thermophysical parameters is determined by a characteristic table of the turbine inlet regulating valve 3;
with reference to fig. 2, a workflow of the data processing unit 8 is described, comprising the steps of:
step S1: the supercritical carbon dioxide density and pressure measured by densitometers 61, 62 and pressure sensors 71, 72 are received.
Specifically, the data processing unit 8 presets a table of thermal physical properties of supercritical carbon dioxide describing the relationship among parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity of the supercritical carbon dioxide fluid, and values of all parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity can be obtained according to values of any two parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity;
step S2: and substituting the received density and pressure measurement values into a preset supercritical carbon dioxide thermophysical property table to obtain the supercritical carbon dioxide thermophysical parameters in the working medium channel 12.
Step S3: the preset supercritical carbon dioxide flow heat exchange calculation program reads the supercritical carbon dioxide thermophysical parameters in the working medium channel, and calculates the supercritical carbon dioxide thermophysical parameters at the outlet of the working medium channel 12.
Specifically, a supercritical carbon dioxide flowing heat exchange calculation program preset by the data processing unit 8 calculates and obtains numerical values of parameters such as supercritical carbon dioxide fluid speed, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, heat conductivity coefficient and the like at the outlet of the working medium channel 12 according to the thermophysical parameters of the high-temperature fluid;
step S4: substituting the supercritical carbon dioxide thermophysical parameters of the outlet of the working medium channel 12 into a preset turbine inlet regulating valve characteristic table to obtain the opening degree of the turbine inlet regulating valve 3 and the supercritical carbon dioxide thermophysical parameters of the outlet of the turbine inlet regulating valve 3.
Specifically, the data processing unit 8 sets a supercritical carbon dioxide turbine characteristic table describing a relationship among a rotational speed of the supercritical carbon dioxide turbine 2, a flow rate, a density, a pressure, a temperature, a specific heat, a specific enthalpy, a dynamic viscosity, a thermal conductivity and other thermal physical parameters of the supercritical carbon dioxide turbine 2, wherein the efficiency of the supercritical carbon dioxide turbine 2 can be obtained according to the thermal physical parameters of the supercritical carbon dioxide and the rotational speed of the supercritical carbon dioxide turbine 2, when the thermal physical parameters of the supercritical carbon dioxide turbine 2 are fixed, the rotational speed of the supercritical carbon dioxide turbine 2 corresponding to the optimal efficiency can be calculated according to the characteristic table of the supercritical carbon dioxide turbine 2, when the rotational speed of the supercritical carbon dioxide turbine 2 is fixed, the thermal physical parameters of the supercritical carbon dioxide turbine 2 corresponding to the optimal efficiency can be calculated according to the characteristic table of the supercritical carbon dioxide turbine 2;
step S5: an opening control signal is sent to the turbine inlet regulating valve 3.
Step S6: substituting the supercritical carbon dioxide thermophysical parameters of the outlet of the turbine inlet regulating valve 3 into a preset supercritical carbon dioxide turbine characteristic table to obtain the rotating speed corresponding to the optimal efficiency working point of the supercritical carbon dioxide turbine 2.
Step S7: a rotational speed control signal is sent to the turbine propulsion motor 4.
Specifically, the turbine inlet regulating valve characteristic table preset by the data processing unit 8 describes the relationship between the opening of the turbine inlet regulating valve 3 and the thermal physical parameters such as the flow rate, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, heat conductivity and the like of the supercritical carbon dioxide at the inlet of the turbine inlet regulating valve 3, the thermal physical parameters of the supercritical carbon dioxide at the outlet of the turbine inlet regulating valve 3 can be obtained according to the thermal physical parameters of the supercritical carbon dioxide at the inlet of the turbine inlet regulating valve 3 and the opening of the turbine inlet regulating valve 3, and when the thermal physical parameters of the supercritical carbon dioxide at the inlet of the turbine inlet regulating valve 3 are fixed, the opening of the turbine inlet regulating valve 3 corresponding to the optimal efficiency of the supercritical carbon dioxide turbine 2 can be calculated according to the turbine inlet regulating valve characteristic table;
for example, the data processing unit 8 receives signals transmitted by two densitometers and two pressure sensors through cables, and calculates the thermal physical property parameter of the supercritical carbon dioxide at the outlet of the working medium channel according to a preset thermal physical property table of the supercritical carbon dioxide, and the thermal physical property parameter of the supercritical carbon dioxide at the outlet of the working medium channel is 513.44 ℃ and the density is 52.45kg/m according to a preset thermal physical property table of the supercritical carbon dioxide 3 The specific heat is 1.19kJ/kg, the specific enthalpy is 1000.98 kJ/kg, the dynamic viscosity is 3.51E-05 Pa.s, the heat conductivity coefficient is 0.06W/m, the flow rate is 8m/s, the signal output end 82 sends a control signal with the opening degree controlled at 30 degrees to the turbine inlet regulating valve 3 and sends a control signal with the rotating speed controlled at 25000rpm to the turbine propulsion motor 4, at the moment, the supercritical carbon dioxide turbine 2 stably operates at the optimal efficiency working point, and the operating efficiency reaches 80%.
According to the supercritical carbon dioxide heating expansion system provided by the invention, the data processing unit is arranged to receive measurement signals transmitted by the plurality of densitometers and the pressure sensors through the cables, the flow and heat transfer performance of the supercritical carbon dioxide heater is accurately predicted by the supercritical carbon dioxide flow heat exchange calculation program according to the preset supercritical carbon dioxide thermophysical property table, the rotating speed control signal is sent to the turbine propulsion motor according to the prediction result, the opening control signal is sent to the turbine inlet regulating valve, so that the supercritical carbon dioxide turbine runs at the optimal efficiency working point, and the system stability and the thermodynamic cycle efficiency of the supercritical carbon dioxide heating expansion system are improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A supercritical carbon dioxide heating expansion system comprising: the device comprises a supercritical carbon dioxide heater, a supercritical carbon dioxide turbine, a turbine inlet regulating valve, a turbine propulsion motor, a flowmeter, a densimeter, a pressure sensor and a data processing unit, and is characterized in that the supercritical carbon dioxide heater is provided with a heat source channel and a working medium channel;
the supercritical carbon dioxide turbine inlet is connected with the turbine inlet regulating valve outlet through a pipeline;
the turbine shaft of the supercritical carbon dioxide turbine is connected with the motor shaft of the turbine propulsion motor through a coupler, and the rotating speed of the supercritical carbon dioxide turbine is the same as that of the turbine propulsion motor;
the flowmeter is arranged between the outlet of the working medium channel and the turbine inlet regulating valve, is connected with the outlet of the working medium channel and the inlet of the turbine inlet regulating valve through pipelines respectively, and is provided with a cable end for outputting measurement data;
the number of the densimeter and the pressure sensor is more than or equal to 2, each densimeter and each pressure sensor are inserted into a working medium channel of the supercritical carbon dioxide heater, and each densimeter and each pressure sensor are provided with a measuring end and a cable end;
the data processing unit is internally preset with a supercritical carbon dioxide thermophysical property table, a supercritical carbon dioxide flow heat exchange calculation program, a turbine inlet regulating valve characteristic table and a supercritical carbon dioxide turbine characteristic table, receives supercritical carbon dioxide density data transmitted by the densimeter and supercritical carbon dioxide pressure data transmitted by the pressure sensor, calculates and obtains the outlet thermophysical parameter of the working medium channel of the supercritical carbon dioxide heater, sends an opening control signal to the turbine inlet regulating valve, and sends a rotating speed control signal to the turbine propulsion motor;
the data processing unit is provided with a data acquisition end which is connected with the cable end of the densimeter and the cable end of the pressure sensor through cables, and a signal output end which is connected with the wiring terminal of the turbine inlet regulating valve and the wiring terminal of the turbine propulsion motor through cables.
2. The supercritical carbon dioxide heater according to claim 1, wherein the flow medium in the heat source channel is a high temperature fluid, the flow medium in the working medium channel is supercritical carbon dioxide, and the working medium channel outlet is connected to the flowmeter inlet through a pipe.
3. The densitometer and pressure sensor of claim 1 wherein the measurement end is in direct contact with the flow medium in the working fluid channel and the cable end is connected to the data processing unit by a cable.
4. The turbine inlet regulator valve of claim 1, wherein the supercritical carbon dioxide thermophysical parameter of the working fluid passage outlet and the turbine inlet regulator valve inlet varies as the opening of the turbine inlet regulator valve varies.
5. The data processing unit according to claim 1, wherein the predetermined table of thermo-physical properties of supercritical carbon dioxide describes a relationship between parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity of the supercritical carbon dioxide fluid, and values of all parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity are obtained from values of any two of the parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity.
6. The data processing unit according to claims 1 and 5, wherein the preset supercritical carbon dioxide flow heat exchange calculation program calculates the values of parameters such as the supercritical carbon dioxide fluid velocity, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity of the working medium channel outlet according to the thermal physical parameters of the high-temperature fluid and the values of the supercritical carbon dioxide fluid flow, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity of the working medium channel outlet.
7. The data processing unit according to claims 1, 5 and 6, wherein the preset supercritical carbon dioxide turbine characteristic table describes a relationship between a rotational speed and an efficiency of the supercritical carbon dioxide turbine and a thermal physical parameter such as a supercritical carbon dioxide flow rate, a density, a pressure, a temperature, a specific heat, a specific enthalpy, a dynamic viscosity, a thermal conductivity and the like of the working medium channel outlet, the efficiency of the supercritical carbon dioxide turbine is obtained according to the thermal physical parameter of the supercritical carbon dioxide turbine inlet and the rotational speed of the supercritical carbon dioxide turbine, the thermal physical parameter of the supercritical carbon dioxide turbine inlet corresponding to the optimal efficiency is calculated according to the supercritical carbon dioxide turbine characteristic table when the rotational speed of the supercritical carbon dioxide turbine is fixed, and the rotational speed of the supercritical carbon dioxide turbine corresponding to the optimal efficiency is calculated according to the supercritical carbon dioxide turbine characteristic table when the thermal physical parameter of the supercritical carbon dioxide at the supercritical carbon dioxide turbine inlet is fixed.
8. The data processing unit according to claims 1, 5 to 7, wherein a preset turbine inlet regulating valve characteristic table describes a relationship between an opening of the turbine inlet regulating valve and a thermal physical parameter such as a flow rate, a density, a pressure, a temperature, a specific heat, a specific enthalpy, a dynamic viscosity, a thermal conductivity, etc. of supercritical carbon dioxide of an inlet of the turbine inlet regulating valve, and the thermal physical parameter of supercritical carbon dioxide of an outlet of the turbine inlet regulating valve is obtained from the thermal physical parameter of supercritical carbon dioxide of the inlet of the turbine inlet regulating valve and the opening of the turbine inlet regulating valve, and when the thermal physical parameter of supercritical carbon dioxide of the inlet of the turbine inlet regulating valve is fixed, the opening of the turbine inlet regulating valve corresponding to the optimal efficiency of the supercritical carbon dioxide turbine is calculated from the turbine inlet regulating valve characteristic table.
9. A data processing unit according to claims 1, 5 to 8, wherein the opening degree of the turbine inlet regulating valve is controlled by an opening degree control signal output from the signal output, and the rotational speed of the turbine propulsion motor is controlled by a rotational speed control signal output from the signal output.
CN202310803018.4A 2023-07-03 2023-07-03 Supercritical carbon dioxide heating expansion system Pending CN116771451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310803018.4A CN116771451A (en) 2023-07-03 2023-07-03 Supercritical carbon dioxide heating expansion system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310803018.4A CN116771451A (en) 2023-07-03 2023-07-03 Supercritical carbon dioxide heating expansion system

Publications (1)

Publication Number Publication Date
CN116771451A true CN116771451A (en) 2023-09-19

Family

ID=87994485

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310803018.4A Pending CN116771451A (en) 2023-07-03 2023-07-03 Supercritical carbon dioxide heating expansion system

Country Status (1)

Country Link
CN (1) CN116771451A (en)

Similar Documents

Publication Publication Date Title
CN210058277U (en) Multifunctional reaction kettle temperature control device
CN104966536A (en) High-temperature working medium heat exchange test system using heat conducting oil as hot fluid and test method
CN110133038B (en) Oscillatory heat pipe, static test platform and heat exchange performance evaluation method
EP1819997B1 (en) Thermally controlled process interface
CN111413126A (en) Heat accumulation experimental system and control and detection device thereof
JP5840466B2 (en) Variable flow rate control device for heat source pump
CN112228329A (en) System, device and method for automatically optimizing and adjusting running frequency of circulating water pump
CN116771451A (en) Supercritical carbon dioxide heating expansion system
JPS60134903A (en) Process variable controller for distribution medium
EP2715213B1 (en) Gas heating system for gas pressure reducing systems and method for obtaining said heating effect
US10443861B2 (en) Heat exchanger control and diagnostic apparatus
CN116771446A (en) Supercritical carbon dioxide cooling compression system
CN110641675B (en) Variable working condition low noise regulation and control device of ship cooling system and regulation and control method thereof
CN116792956A (en) Supercritical carbon dioxide compression heat regeneration system
CN104807522B (en) High-temperature gas flow measurement standard set-up and its detection method
CN107131978B (en) Calibration device and calibration method for commercial circulating heat pump water heater testing device
CN212255154U (en) Detection apparatus for low temperature ground heat sleeve pipe
CN105572168A (en) Thermal type steam dryness meter
CN110966772B (en) Multi-medium multi-temperature intelligent heating system and method
CN106525164B (en) A kind of flow-measuring method of high temperature strong corrosion flue gas
CN111505049A (en) Detection apparatus for low temperature ground heat sleeve pipe
CN113686012A (en) Temperature control method of gas water heater and gas water heater system applying same
CN114062000B (en) Device and method for testing performance of intercooler of fuel cell system
CN107144315B (en) A kind of gas flow metering device and method based on screw type expansion machine
CN216788675U (en) Operation monitoring system for steam-driven and electric feed pump

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination