CN214660394U - Supercritical carbon dioxide circulation system - Google Patents
Supercritical carbon dioxide circulation system Download PDFInfo
- Publication number
- CN214660394U CN214660394U CN202121152465.0U CN202121152465U CN214660394U CN 214660394 U CN214660394 U CN 214660394U CN 202121152465 U CN202121152465 U CN 202121152465U CN 214660394 U CN214660394 U CN 214660394U
- Authority
- CN
- China
- Prior art keywords
- turbine
- valve
- compressor
- inlet
- outlet
- 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.)
- Active
Links
Images
Landscapes
- Control Of Turbines (AREA)
Abstract
The utility model discloses a supercritical carbon dioxide circulation system, this system include compressor inverter motor, compressor, working medium storage jar, return circuit heater, return circuit cooler, turbine, generator, and various control flap. Before the compressor and the turbine are started to impact and rotate, dry gas sealing gas is adopted to pressurize the interior of the cavity; when the turbine increases the speed and increases or decreases the load, the working medium in the main loop is supplemented or discharged through the working medium storage tank, and the pressure at the inlet and the outlet of the compressor is kept stable; in the process of flushing and rotating the turbine, the working medium temperature and the turbine rotating speed are regulated through the power of a main loop heater, the running frequency of a variable frequency motor of a compressor, the opening of an anti-surge valve of the compressor, the opening of a turbine inlet regulating valve and the opening of a turbine bypass valve; the utility model discloses the system has guaranteed security and reliability that carbon dioxide circulating unit turbine dashes changes the in-process.
Description
Technical Field
The utility model relates to a supercritical carbon dioxide circulation power generation technical field, in particular to supercritical carbon dioxide circulation system.
Background
With the development of power generation technology in recent years, research shows that a generator set adopts supercritical carbon dioxide to replace steam as a circulating working medium, and has the advantages of high circulating efficiency, compact equipment structure, low capital investment and the like in a certain power range, so that the supercritical carbon dioxide circulating power generation system is a power generation mode with great technical prospect.
Disclosure of Invention
Based on the above consideration, the utility model aims to provide a supercritical carbon dioxide circulation system, through the linkage regulation to the rotational speed of major loop heater power, compressor, prevent breathing heavily valve opening, the entry regulating valve opening of turbine and turbine bypass valve opening, accomplish compressor and turbine hot start and rush to change the process.
In order to realize the purpose, the utility model discloses a technical scheme is:
a supercritical carbon dioxide circulating system comprises a compressor, an auxiliary regulating system, a turbine, an auxiliary regulating system, a high-pressure storage loop system, a low-pressure storage loop system and a heat exchange and flow control system;
the compressor and auxiliary regulating system comprises a compressor inlet valve 1, a compressor dry gas sealing flow control valve 2, a compressor variable frequency motor 3, a compressor 4, a compressor anti-surge loop cooler 5, a compressor anti-surge valve 6, a compressor outlet valve 7 and a compressor emptying valve 31; the compressor and the auxiliary adjusting system are used for compressing cold working media in the supercritical carbon dioxide circulating system and increasing pressure; the compressor variable frequency motor 3 can adjust the rotating speed of the compressor according to the frequency instruction to adjust the output of the compressor; the compressor surge prevention valve 6 automatically acts according to the position of the working condition point of the compressor to prevent surge or actively act as the output regulation of the compressor; the compressor surge-preventing loop cooler 5 is used for controlling the inlet temperature of the compressor 4 during operation; the compressor dry gas seal flow control valve 2 is used for controlling the flow of dry gas seal gas; the compressor evacuation valve 31 is used for adjusting the pressure of the internal chamber of the compressor in the processes of starting and emergency shutdown;
the turbine and auxiliary regulating system comprises a turbine inlet regulating valve 15, a turbine disc vehicle motor 16, a turbine 17, a generator 18, a turbine bypass regulating valve 19, a turbine dry gas sealing control valve 20, a turbine outlet check valve 21 and a turbine exhaust valve 30; the turbine inlet regulating valve 15 controls the output power of the turbine by regulating the flow of the working medium at the turbine inlet; the turbine barring motor 16 is used for carrying out low-speed barring on the turbine before starting and after stopping the turbine; the turbine 17 drives the generator 18 to rotate to generate electricity; the turbine bypass regulating valve 19 is used for regulating the mass flow of the thermal state working medium passing through the turbine; the turbine dry gas sealing control valve 20 is used for controlling the flow of dry gas sealing gas; the turbine outlet check valve 21 is used for preventing the turbine outlet working medium from reversely flowing into the interior of the turbine; the turbine exhaust valve 30 is used for regulating the pressure of the internal chamber of the turbine in the processes of starting and emergency shutdown;
the high-pressure storage loop system comprises a high-pressure storage loop inlet valve 9, a high-pressure storage loop cooler 10, a high-pressure working medium storage tank 11, a high-pressure storage loop heater 12 and a high-pressure storage loop outlet valve 13, wherein the high-pressure storage loop inlet valve 9 and the high-pressure storage loop outlet valve 13 are used for controlling the flow of working media flowing into or out of the high-pressure working medium storage tank 11; the high-pressure storage loop cooler 10 and the high-pressure storage loop heater 12 are used for controlling the temperature of working media flowing into or out of the high-pressure working medium storage tank 11; the high-pressure working medium storage tank 11 is used for storing high-pressure working medium at the outlet of the compressor at the shutdown or load reduction stage;
the low-pressure storage loop system comprises a low-pressure storage loop inlet valve 24, a working medium supplement inlet control valve 23, a low-pressure storage loop cooler 25, a low-pressure working medium storage tank 26, a low-pressure storage loop heater 27 and a low-pressure storage loop outlet valve 28, wherein the low-pressure storage loop inlet valve 24 and the low-pressure storage loop outlet valve 28 are used for controlling the flow of the working medium flowing into or out of the low-pressure working medium storage tank 26; the working medium supplement inlet control valve 23 is used for controlling the flow rate of the low-pressure working medium storage tank 26 during supplement of the working medium before starting the machine; the low-pressure storage loop cooler 25 and the low-pressure storage loop heater 27 are used for controlling the temperature of the working medium flowing into or flowing out of the low-pressure working medium storage tank 26; the low-pressure working medium storage tank 26 is used for storing working media before starting the compressor, and controlling the inlet pressure of the compressor 4 in the starting or load adjusting stage;
the heat exchange and flow control system comprises a main heater inlet control valve 8, a main loop heater 14, a main loop cooler 22, a main cooler outlet control valve 29 and a heat regenerator 32, wherein the main heater inlet control valve 8 and the main cooler outlet control valve 29 are used for controlling the flow of working media in a main loop, and the heat regenerator 32 is used for carrying out heat exchange on cold working media at the outlet of the compressor 4 and hot working media at the outlet of the turbine 17, heating the cold working media at the outlet of the compressor 4 and cooling the hot working media at the outlet of the turbine 17; the main loop heater 14 is used for further heating and warming the working medium at the outlet of the cold side of the heat regenerator 32; the main loop cooler 22 is used for further cooling the working medium at the outlet of the hot side of the heat regenerator 32;
the specific connection relationship of each component in the supercritical carbon dioxide circulation system is as follows:
the inlet valve 1 of the compressor is communicated with the inlet of the compressor 4 and the outlet of the compressor anti-surge loop cooler 5 respectively; the front of the compressor dry gas seal flow control valve 2 is communicated with a dry gas seal gas source, and the rear of the valve is communicated with the inner cavity of the compressor 4; the front of the compressor evacuation valve 31 is communicated with the inner cavity of the compressor 4, and the rear of the valve is communicated with the atmosphere; the compressor variable frequency motor 3 is connected with the compressor 4 by a coupler; the outlet of the compressor 4 is respectively communicated with the front of a compressor surge prevention valve 6 and the front of a compressor outlet valve 7; the back of the compressor surge-proof valve 6 is communicated with the inlet of the compressor surge-proof loop cooler 5; the rear part of the compressor outlet valve 7 is respectively communicated with the front part of a high-pressure storage loop inlet valve 9 and the front part of a main heater inlet control valve 8; the inlet valve 9 of the high-pressure storage loop is communicated with the inlet of a cooler 10 of the high-pressure storage loop; the outlet of the high-pressure storage loop cooler 10 is communicated with the inlet of the high-pressure working medium storage tank 11; an outlet of the high-pressure working medium storage tank 11 is communicated with an inlet of the high-pressure storage loop heater 12; the outlet of the high-pressure storage loop heater 12 is communicated with the front of a high-pressure storage loop outlet valve 13; the inlet control valve 8 of the main heater and the outlet valve 13 of the high-pressure storage loop are communicated with the cold side inlet of the heat regenerator 32; the cold side outlet of regenerator 32 is in communication with the inlet of primary loop heater 14; the outlet of the main loop heater 14 is respectively communicated with the valve front of the turbine inlet regulating valve 15 and the valve front of the turbine bypass regulating valve 19; the turbine inlet adjusting valve 15 is communicated with the inlet of a turbine 17; the turbine 17 is connected with the generator 18 by a coupler; the turbine barring motor 16 is connected with the turbine 17 by a clutch; the front part of a dry gas seal control valve 20 of the turbine is communicated with a dry gas seal gas source, and the rear part of the valve is communicated with an inner cavity of the turbine 17; the front of the valve of the turbine exhaust valve 30 is communicated with the inner cavity of the turbine 17, and the rear of the valve is communicated with the atmosphere; the outlet of the turbine 17 is communicated with the front part of a turbine outlet check valve 21; the back of the turbine outlet check valve 21 and the back of the turbine bypass regulating valve 19 are communicated with the hot side inlet of the heat regenerator 32; the hot side outlet of the regenerator 32 is in communication with the inlet of the primary loop cooler 22; the outlet of the main loop cooler 22 is respectively communicated with the front of a low-pressure storage loop inlet valve 24 and the front of a main cooler outlet control valve 29; the front of the working medium supplement inlet control valve 23 is communicated with a working medium storage tank, and the rear of the valve is respectively communicated with the rear of the low-pressure storage loop inlet valve 24 and the inlet of the low-pressure storage loop cooler 25; the outlet of the low-pressure storage loop cooler 25 is communicated with the inlet of a low-pressure working medium storage tank 26; the outlet of the low-pressure working medium storage tank 26 is communicated with the inlet of a low-pressure storage loop heater 27; the outlet of the low-pressure storage loop heater 27 is communicated with the front of a low-pressure storage loop outlet valve 28; the rear of the low-pressure storage loop outlet valve 28 and the rear of the main cooler outlet control valve 29 are communicated with the front of the compressor inlet valve 1;
wherein: the outlet of the compressor 4, the cold side of the regenerator 32, the main loop heater 14, the turbine 17, the hot side of the regenerator 32, the main loop cooler 22 and the inlet of the compressor 4 are connected in sequence to form a main loop.
The main loop heater 14 is a coal-fired boiler, a gas-fired boiler, an electric heater, a solar photo-thermal heater or a nuclear fusion loop heater; the primary loop cooler 22 cooling medium is plant cooling water or cooling air.
The dry gas seal gas of the compressor 4 and the turbine 17 adopts a carbon dioxide working medium, the low-pressure working medium storage tank 26 is adopted for supplying gas in the starting stage, the working medium at the outlet of the compressor 4 is adopted for supplying gas in the operating stage, and the dry gas seal gas is heated to the design temperature of 60-180 ℃ through a heater before entering the compressor and the turbine.
In the process of power generation circulation, carbon dioxide working media sequentially pass through a compressor 4 for compression and pressure increase, a heat regenerator 32 for temperature increase, a main loop heater 14 for temperature increase again, a turbine 17 for expansion work and a generator 18 for power generation, a heat regenerator 32 for temperature reduction and a main loop cooler 22 for temperature reduction again, and then return to the inlet of the compressor 4 to finish a work cycle;
before the unit is started, a working medium supplement inlet control valve 23 and a low-pressure storage loop cooler 25 are opened, sufficient carbon dioxide working medium is filled into a low-pressure working medium storage tank 26, and the pressure in the low-pressure working medium storage tank 26 is ensured to be between 5MPa and 8MPa and is higher than the designed pressure of an inlet of a compressor 4;
after the working medium is supplemented, the dry gas sealing flow control valve 2 of the compressor is opened, the dry gas sealing gas is filled into the inner cavity of the compressor, and the emptying valve 31 of the compressor is kept in a small opening stateKeeping the dry gas sealing gas flow at 50Nm3/h～300Nm3H, keeping the temperature at 60-120 ℃;
keeping dry gas seal gas continuously charged into the compressor 4, gradually closing the compressor evacuation valve 31, opening the low-pressure storage loop outlet valve 28, the compressor inlet valve 1 and the compressor anti-surge valve 6 in sequence after the internal cavity of the compressor 4 exceeds 4MPa, and opening the low-pressure storage loop heater 27 and the compressor anti-surge loop cooler 5 in sequence;
starting the compressor variable frequency motor 3, and setting the lowest running frequency to be 20 Hz; sequentially opening the compressor outlet valve 7, the main heater inlet control valve 8, the turbine bypass regulating valve 19 and the main cooler outlet control valve 29, and opening the main loop cooler 22 while keeping the compressor inlet pressure and temperature stable;
the opening of the anti-surge valve 6 of the compressor is turned down to 50% -30%, the operating frequency of the variable frequency motor 3 of the compressor is increased to 30 Hz-40 Hz, the inlet valve 1 of the compressor is kept fully opened, the mass flow of working media in a main loop is improved, and the cold state circulation of the working media is kept; simultaneously keeping the inlet pressure and temperature of the compressor stable;
opening the turbine dry gas seal control valve 20, charging dry gas seal gas into the turbine internal chamber, keeping the turbine exhaust valve 30 in a small opening state, and keeping the dry gas seal gas flow rate to be 200Nm3/h～600Nm3H, keeping the temperature at 80-150 ℃;
when the internal cavity of the turbine reaches more than 2MPa, starting a turbine turning motor 16 to drive a turbine 17 and a generator 18 to rotate at a low speed, wherein the rated rotating speed range of the turbine turning motor 16 is 5% -15% of the designed rotating speed of the turbine;
starting a main loop heater 14 and slowly increasing the heating power, and increasing the temperature of the working medium before the turbine inlet adjusting valve 15 to a first target temperature of 250-300 ℃, and simultaneously keeping the inlet pressure and temperature of the compressor stable;
the large turbine dry gas sealing control valve 20 is opened to keep the dry gas sealing gas flow of 400Nm3/h～800Nm3H; gradually closing the turbine exhaust valve 30, and increasing the pressure of the internal chamber of the turbine 17 to be higher than the pressure of the working medium before the turbine inlet regulating valve 15;
setting the first target rotation speed of the turbine 17 to 16-20% of the rated rotation speed and the relative lifting rate to 0.005-0.015Ntd/min，NtdFor the designed rotation speed of the turbine, slowly opening a turbine inlet regulating valve 15, slowly closing a turbine bypass regulating valve 19, gradually increasing the turbine 17 to a first target rotation speed, and simultaneously keeping the inlet pressure and the temperature of the compressor stable;
increasing the heating power of a main loop heater 14, slowly increasing the heating power, and increasing the temperature of the working medium before a turbine inlet adjusting valve 15 to a second target temperature of 350-400 ℃; the opening of the compressor surge prevention valve 6 is turned down to 40% -20%, the operation frequency of the compressor variable frequency motor 3 is controlled to be 30 Hz-50 Hz, the turbine inlet adjusting valve 15 is turned down slowly, the turbine bypass adjusting valve 19 is turned up slowly, the turbine 17 is kept stable at the first target rotating speed, and the pressure and the temperature of the compressor inlet are kept stable;
setting the second target rotation speed of the turbine 17 to 40-50% of the rated rotation speed and the relative lifting rate to 0.005-0.015NtdThe turbine inlet regulating valve 15 is opened slowly and the turbine bypass regulating valve 19 is closed slowly through the automatic system control system, the turbine 17 is gradually increased to a second target rotating speed, and meanwhile, the inlet pressure and the temperature of the compressor are kept stable;
increasing the heating power of a main loop heater 14, slowly increasing the heating power to increase the temperature of the working medium before the turbine inlet regulating valve 15 to a third target temperature of 450-500 ℃, controlling the operating frequency of a compressor variable frequency motor 3 to be 30-50 Hz by closing a compressor surge prevention valve 6 to 30-10%, slowly closing the turbine inlet regulating valve 15, slowly opening a turbine bypass regulating valve 19, keeping the turbine 17 to be stabilized at a second target rotating speed, and keeping the pressure and the temperature of the compressor inlet to be stable;
setting the third target rotation speed of the turbine 17 to 70-80% of the rated rotation speed and the relative lifting rate to 0.005-0.015NtdMin; but when the critical speed interval of the generator and the turbine is crossed, the relative rising rate is increased to 0.05-0.15NtdMin; slowly opening the turbine inlet regulating valve 15 and slowly closing the turbine bypass regulating valve 19 to gradually raise the turbine 17 to the third target rotation speed while maintainingKeeping the inlet pressure and temperature of the compressor stable;
increasing the heating power of a main loop heater 14, slowly increasing the heating power to increase the temperature of the working medium before the turbine inlet regulating valve 15 to a fourth target temperature of 550-600 ℃, controlling the operating frequency of the compressor variable frequency motor 3 to be 30-50 Hz by closing the compressor surge prevention valve 6-20% -5%, slowly closing the turbine inlet regulating valve 15, slowly opening the turbine bypass regulating valve 19, keeping the turbine 17 to be stabilized at a third target rotating speed, and keeping the pressure and the temperature of the compressor inlet to be stable;
setting the fourth target speed of the turbine 17 to 100% of the rated speed and the relative lifting rate to 0.005-0.015NtdThe/min, slowly opening the turbine inlet regulating valve 15, slowly closing the turbine bypass regulating valve 19, gradually increasing the turbine 17 to a fourth target rotating speed, and simultaneously keeping the inlet pressure and the temperature of the compressor stable;
after the turbine 17 reaches the rated rotation speed, gradually closing the opening of the compressor surge-proof valve 6 to 0 percent, gradually closing the opening of the turbine bypass regulating valve 19 to 0 percent, stabilizing the temperature of the working medium before the turbine inlet regulating valve 15 to 550-600 ℃, gradually opening the turbine inlet regulating valve 15 to 70-100 percent, and gradually reducing the operation frequency of the compressor variable frequency motor 3 to 30-50 Hz.
In the process of turbine flushing, the temperature and the pressure of the inlet of the compressor are constantly monitored, and the pressure of the working medium at the inlet of the compressor 4 is kept between 4MPa and 7MPa and the temperature is kept between 35 ℃ and 45 ℃ by jointly adjusting the outlet valve 28 of the low-pressure storage loop, the heater 27 of the low-pressure storage loop and the cooler 22 of the main loop.
In the process of temperature rise of the working medium and speed rise of the turbine, the temperature difference range of the inner wall and the outer wall of the cylinder body of the turbine 17 is monitored and kept to be controlled at 20-50 ℃ by controlling the opening degree and the speed rise rate of a valve, if the temperature difference exceeds the upper limit of the temperature range, the temperature rise of the working medium and the speed rise operation of the turbine are suspended until the temperature difference is reduced to a qualified range, and then the temperature rise and the speed rise operation are continued; and after the working medium temperature and the turbine rotating speed reach the new target temperature and the new target rotating speed, stably operating for 30-60 min so as to carry out the next operation.
In the turbine flushing and rotating process, the working medium temperature and the turbine rotating speed are increased in a stepped manner by setting the target temperature of 3-6 working media and the target rotating speed of the turbine; the punching and rotating process comprises the following steps: the rotating speed of the turbine is gradually increased in a mode of firstly increasing the temperature of the working medium, stabilizing for 30-60 min and then increasing the speed of the turbine, and stabilizing for 30-60 min.
The utility model has the advantages that: the utility model provides a hot starting method of supercritical carbon dioxide circulation system compressor and turbine has guaranteed security and reliability that carbon dioxide circulating unit turbine dashes the commentaries on classics in-process. The utility model has the advantages of through the joint regulation to compressor inverter motor, compressor surge-proof valve, turbine entry governing valve, turbine bypass governing valve and major loop heater, reach the effective regulation to system's start-up process, show through field practice that this system has better security and economic nature.
Drawings
Fig. 1 is a flow chart of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a supercritical carbon dioxide circulation system, the equipment number is shown in the figure 1 in the system. In the circulation process, the carbon dioxide working medium returns to the inlet of the compressor after sequentially passing through the compressor 4 for compressing and boosting, the heat regenerator 32 for heating, the main loop heater 14 for heating again, the turbine 17 for expanding and acting, the generator 18 for generating power, the heat regenerator 32 for cooling and the main loop cooler 22 for cooling again, and a complete acting cycle is completed. The system operates as follows:
1) in the power generation cycle process, the carbon dioxide working medium returns to the inlet of the compressor 4 after sequentially passing through the compressor 4 for compression and pressure increase, the heat regenerator 32 for temperature increase, the main loop heater 14 for temperature increase again, the turbine 17 for expansion work and the generator 18 for power generation, the heat regenerator 32 for temperature reduction and the main loop cooler 22 for temperature reduction again, and a work cycle is completed;
2) before the unit is started, a working medium supplement inlet control valve 23 and a low-pressure storage loop cooler 25 are opened, sufficient carbon dioxide working medium is filled into a low-pressure working medium storage tank 26, and the pressure in the low-pressure working medium storage tank 26 is ensured to be between 5MPa and 8MPa and is higher than the designed pressure of an inlet of a compressor 4;
3) after the working medium is supplemented, the dry gas seal flow control valve 2 of the compressor is opened, the dry gas seal gas is filled into the inner cavity of the compressor, the emptying valve 31 of the compressor is kept in a small opening state, and the flow of the dry gas seal gas is kept at 50Nm3/h～300Nm3H, keeping the temperature at 60-120 ℃;
4) keeping dry gas seal gas continuously charged into the compressor 4, gradually closing the compressor evacuation valve 31, opening the low-pressure storage loop outlet valve 28, the compressor inlet valve 1 and the compressor anti-surge valve 6 in sequence after the internal cavity of the compressor 4 exceeds 4MPa, and opening the low-pressure storage loop heater 27 and the compressor anti-surge loop cooler 5 in sequence;
5) starting the compressor variable frequency motor 3, and setting the lowest running frequency to be 20 Hz; sequentially opening the compressor outlet valve 7, the main heater inlet control valve 8, the turbine bypass regulating valve 19 and the main cooler outlet control valve 29, and opening the main loop cooler 22 while keeping the compressor inlet pressure and temperature stable;
6) the opening of the anti-surge valve 6 of the compressor is turned down to 50% -30%, the operating frequency of the variable frequency motor 3 of the compressor is increased to 30 Hz-40 Hz, the inlet valve 1 of the compressor is kept fully opened, the mass flow of working media in a main loop is improved, and the cold state circulation of the working media is kept; simultaneously keeping the inlet pressure and temperature of the compressor stable;
7) opening the turbine dry gas seal control valve 20, charging dry gas seal gas into the turbine internal chamber, keeping the turbine exhaust valve 30 in a small opening state, and keeping the dry gas seal gas flow rate to be 200Nm3/h～600Nm3H, keeping the temperature at 80-150 ℃;
8) when the internal cavity of the turbine reaches more than 2MPa, starting a turbine turning motor 16 to drive a turbine 17 and a generator 18 to rotate at a low speed, wherein the rated rotating speed range of the turbine turning motor 16 is 5% -15% of the designed rotating speed of the turbine;
9) starting a main loop heater 14 and slowly increasing the heating power, and increasing the temperature of the working medium before the turbine inlet adjusting valve 15 to a first target temperature of 250-300 ℃, and simultaneously keeping the inlet pressure and temperature of the compressor stable;
10) the large turbine dry gas sealing control valve 20 is opened to keep the dry gas sealing gas flow of 400Nm3/h～800Nm3H; gradually closing the turbine exhaust valve 30, and increasing the pressure of the internal chamber of the turbine 17 to be higher than the pressure of the working medium before the turbine inlet regulating valve 15;
11) setting the first target rotation speed of the turbine 17 to 16-20% of the rated rotation speed and the relative lifting rate to 0.005-0.015Ntd/min，NtdFor the designed rotation speed of the turbine, slowly opening a turbine inlet regulating valve 15, slowly closing a turbine bypass regulating valve 19, gradually increasing the turbine 17 to a first target rotation speed, and simultaneously keeping the inlet pressure and the temperature of the compressor stable;
12) increasing the heating power of a main loop heater 14, slowly increasing the heating power, and increasing the temperature of the working medium before a turbine inlet adjusting valve 15 to a second target temperature of 350-400 ℃; the opening of the compressor surge prevention valve 6 is turned down to 40% -20%, the operation frequency of the compressor variable frequency motor 3 is controlled to be 30 Hz-50 Hz, the turbine inlet adjusting valve 15 is turned down slowly, the turbine bypass adjusting valve 19 is turned up slowly, the turbine 17 is kept stable at the first target rotating speed, and the pressure and the temperature of the compressor inlet are kept stable;
13) setting the second target rotation speed of the turbine 17 to 40-50% of the rated rotation speed and the relative lifting rate to 0.005-0.015NtdThe turbine inlet regulating valve 15 is opened slowly and the turbine bypass regulating valve 19 is closed slowly through the automatic system control system, the turbine 17 is gradually increased to a second target rotating speed, and meanwhile, the inlet pressure and the temperature of the compressor are kept stable;
14) increasing the heating power of a main loop heater 14, slowly increasing the heating power to increase the temperature of the working medium before the turbine inlet regulating valve 15 to a third target temperature of 450-500 ℃, controlling the operating frequency of a compressor variable frequency motor 3 to be 30-50 Hz by closing a compressor surge prevention valve 6 to 30-10%, slowly closing the turbine inlet regulating valve 15, slowly opening a turbine bypass regulating valve 19, keeping the turbine 17 to be stabilized at a second target rotating speed, and keeping the pressure and the temperature of the compressor inlet to be stable;
15) setting a third target rotation of the turbine 17The speed is 70-80% of the rated speed, and the relative lifting rate is 0.005-0.015NtdMin; but when the critical speed interval of the generator and the turbine is crossed, the relative rising rate is increased to 0.05-0.15NtdMin; slowly opening a turbine inlet regulating valve 15 and slowly closing a turbine bypass regulating valve 19, gradually increasing the turbine 17 to a third target rotating speed, and simultaneously keeping the inlet pressure and temperature of the compressor stable;
16) increasing the heating power of a main loop heater 14, slowly increasing the heating power to increase the temperature of the working medium before the turbine inlet regulating valve 15 to a fourth target temperature of 550-600 ℃, controlling the operating frequency of the compressor variable frequency motor 3 to be 30-50 Hz by closing the compressor surge prevention valve 6-20% -5%, slowly closing the turbine inlet regulating valve 15, slowly opening the turbine bypass regulating valve 19, keeping the turbine 17 to be stabilized at a third target rotating speed, and keeping the pressure and the temperature of the compressor inlet to be stable;
17) setting the fourth target speed of the turbine 17 to 100% of the rated speed and the relative lifting rate to 0.005-0.015NtdThe/min, slowly opening the turbine inlet regulating valve 15, slowly closing the turbine bypass regulating valve 19, gradually increasing the turbine 17 to a fourth target rotating speed, and simultaneously keeping the inlet pressure and the temperature of the compressor stable;
18) after the turbine 17 reaches the rated rotation speed, gradually closing the opening of the compressor surge-proof valve 6 to 0 percent, gradually closing the opening of the turbine bypass regulating valve 19 to 0 percent, stabilizing the temperature of the working medium before the turbine inlet regulating valve 15 to 550-600 ℃, gradually opening the turbine inlet regulating valve 15 to 70-100 percent, and gradually reducing the operation frequency of the compressor variable frequency motor 3 to 30-50 Hz.
Claims (3)
1. A supercritical carbon dioxide circulating system is characterized by comprising a compressor and auxiliary regulating system, a turbine and auxiliary regulating system, a high-pressure storage loop system, a low-pressure storage loop system and a heat exchange and flow control system;
the compressor and auxiliary regulating system comprises a compressor inlet valve (1), a compressor dry gas sealing flow control valve (2), a compressor variable frequency motor (3), a compressor (4), a compressor anti-surge loop cooler (5), a compressor anti-surge valve (6), a compressor outlet valve (7) and a compressor emptying valve (31);
the turbine and auxiliary adjusting system comprises a turbine inlet adjusting valve (15), a turbine disc vehicle motor (16), a turbine (17), a generator (18), a turbine bypass adjusting valve (19), a turbine dry gas sealing control valve (20), a turbine outlet check valve (21) and a turbine emptying valve (30);
the high-pressure storage loop system comprises a high-pressure storage loop inlet valve (9), a high-pressure storage loop cooler (10), a high-pressure working medium storage tank (11), a high-pressure storage loop heater (12) and a high-pressure storage loop outlet valve (13);
the low-pressure storage loop system comprises a low-pressure storage loop inlet valve (24), a working medium supplement inlet control valve (23), a low-pressure storage loop cooler (25), a low-pressure working medium storage tank (26), a low-pressure storage loop heater (27) and a low-pressure storage loop outlet valve (28);
the heat exchange and flow control system comprises a main heater inlet control valve (8), a main loop heater (14), a main loop cooler (22), a main cooler outlet control valve (29) and a heat regenerator (32);
the specific connection relationship of each component in the supercritical carbon dioxide circulation system is as follows:
the back of the compressor inlet valve (1) is respectively communicated with the inlet of the compressor (4) and the outlet of the compressor anti-surge loop cooler (5); the front of the dry gas seal flow control valve (2) of the compressor is communicated with a dry gas seal gas source, and the rear of the valve is communicated with the inner cavity of the compressor (4); the front of the compressor exhaust valve (31) is communicated with the inner cavity of the compressor (4), and the rear of the valve is communicated with the atmosphere; the compressor variable frequency motor (3) is connected with the compressor (4) by a coupler; the outlet of the compressor (4) is respectively communicated with the front of the compressor surge prevention valve (6) and the front of the compressor outlet valve (7); the back of the compressor surge-proof valve (6) is communicated with the inlet of the compressor surge-proof loop cooler (5); the rear part of the outlet valve (7) of the compressor is respectively communicated with the front part of an inlet valve (9) of the high-pressure storage loop and the front part of an inlet control valve (8) of the main heater; the inlet valve (9) of the high-pressure storage loop is communicated with the inlet of a cooler (10) of the high-pressure storage loop; the outlet of the high-pressure storage loop cooler (10) is communicated with the inlet of a high-pressure working medium storage tank (11); an outlet of the high-pressure working medium storage tank (11) is communicated with an inlet of the high-pressure storage loop heater (12); the outlet of the high-pressure storage loop heater (12) is communicated with the front of the high-pressure storage loop outlet valve (13); the back of the inlet control valve (8) of the main heater and the back of the outlet valve (13) of the high-pressure storage loop are communicated with the cold side inlet of the heat regenerator (32); the outlet of the cold side of the heat regenerator (32) is communicated with the inlet of the main loop heater (14); the outlet of the main loop heater (14) is respectively communicated with the front of a turbine inlet regulating valve (15) and the front of a turbine bypass regulating valve (19); the rear part of the turbine inlet regulating valve (15) is communicated with the inlet of a turbine (17); the turbine (17) is connected with the generator (18) by a coupling; the turbine disc vehicle motor (16) is connected with the turbine (17) by a clutch; the front part of a dry gas seal control valve (20) of the turbine is communicated with a dry gas seal gas source, and the rear part of the valve is communicated with an inner cavity of the turbine (17); the front of the turbine exhaust valve (30) is communicated with the inner cavity of the turbine (17), and the rear of the valve is communicated with the atmosphere; the outlet of the turbine (17) is communicated with the front part of a turbine outlet check valve (21); the back of the turbine outlet check valve (21) and the back of the turbine bypass regulating valve (19) are communicated with the hot side inlet of the heat regenerator (32); the outlet of the hot side of the heat regenerator (32) is communicated with the inlet of the main loop cooler (22); the outlet of the main loop cooler (22) is respectively communicated with the front of a low-pressure storage loop inlet valve (24) and the front of a main cooler outlet control valve (29); the front of the working medium supplement inlet control valve (23) is communicated with a working medium storage tank, and the rear of the valve is respectively communicated with the rear of a low-pressure storage loop inlet valve (24) and the inlet of a low-pressure storage loop cooler (25); the outlet of the low-pressure storage loop cooler (25) is communicated with the inlet of a low-pressure working medium storage tank (26); an outlet of the low-pressure working medium storage tank (26) is communicated with an inlet of a low-pressure storage loop heater (27); the outlet of the low-pressure storage loop heater (27) is communicated with the front of a low-pressure storage loop outlet valve (28); the rear part of the low-pressure storage loop outlet valve (28) and the rear part of the main cooler outlet control valve (29) are communicated with the front part of the compressor inlet valve (1);
wherein: the outlet of the compressor (4), the cold side of the heat regenerator (32), the main loop heater (14), the turbine (17), the hot side of the heat regenerator (32), the main loop cooler (22) and the inlet of the compressor (4) are sequentially connected to form a main loop.
2. The supercritical carbon dioxide cycle system according to claim 1, wherein the main loop heater (14) is a coal-fired boiler, a gas-fired boiler, an electric heater, a solar photothermal heater or a nuclear fusion loop heater; the main loop cooler (22) cooling medium is plant cooling water or cooling air.
3. The supercritical carbon dioxide circulation system according to claim 1, wherein the dry gas seal gas of the compressor (4) and the turbine (17) adopts carbon dioxide working medium, the low-pressure working medium storage tank (26) is used for supplying gas in the starting stage, the working medium at the outlet of the compressor (4) is used for supplying gas in the operating stage, and the dry gas seal gas is heated to the design temperature of 60-180 ℃ by the heater before entering the compressor and the turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121152465.0U CN214660394U (en) | 2021-05-27 | 2021-05-27 | Supercritical carbon dioxide circulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121152465.0U CN214660394U (en) | 2021-05-27 | 2021-05-27 | Supercritical carbon dioxide circulation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214660394U true CN214660394U (en) | 2021-11-09 |
Family
ID=78486228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121152465.0U Active CN214660394U (en) | 2021-05-27 | 2021-05-27 | Supercritical carbon dioxide circulation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214660394U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137287A (en) * | 2021-05-27 | 2021-07-20 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulating system and hot-state starting method of compressor and turbine |
| CN113137287B (en) * | 2021-05-27 | 2024-10-29 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulating system, compressor and turbine thermal state starting method |
-
2021
- 2021-05-27 CN CN202121152465.0U patent/CN214660394U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137287A (en) * | 2021-05-27 | 2021-07-20 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulating system and hot-state starting method of compressor and turbine |
| CN113137287B (en) * | 2021-05-27 | 2024-10-29 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulating system, compressor and turbine thermal state starting method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113137293B (en) | Supercritical carbon dioxide circulation system and turbine adjusting and emergency shutdown method | |
| CN109322716B (en) | Gas-steam combined cycle high back pressure heat supply unit and rotor-changing non-stop combustion machine method | |
| CN113833534B (en) | Supercritical carbon dioxide turbine shaft seal air supply and air leakage recovery system and method | |
| CN214660403U (en) | Coaxial integrated equipment for supercritical carbon dioxide power generation and replaceable energy storage system | |
| CN113464230A (en) | Back pressure adjustable supercritical carbon dioxide circulating power generation system and control method | |
| CN108640082A (en) | A kind of device and method using metal hydride step recovery waste heat | |
| CN109779699B (en) | High-efficiency energy-saving quick starting system of steam turbine generator unit and operation method thereof | |
| CN113187573A (en) | Supercritical carbon dioxide power generation coaxial integrated equipment and displacement type energy storage method | |
| CN115717845A (en) | Method for improving peak regulation capacity of thermal power generating unit by fused salt energy storage | |
| CN215333025U (en) | Supercritical carbon dioxide circulation power generation system with adjustable back pressure | |
| CN115263476B (en) | Control method of supercritical carbon dioxide serial double-turbine power generation system | |
| CN114001398A (en) | Winter heat supply and power generation switching system and method under supercritical carbon dioxide power generation background | |
| CN115478909A (en) | Low-temperature starting control method for air turbine | |
| CN113638776B (en) | Steam extraction back pressure type steam turbine thermodynamic system and control method thereof | |
| CN214660394U (en) | Supercritical carbon dioxide circulation system | |
| CN110645101B (en) | Constant-temperature air inlet device and method for combustion synthesis gas turbine | |
| CN115013101B (en) | Coordinated control system of supercritical carbon dioxide generator set | |
| CN115750016B (en) | Shutdown system and method of supercritical carbon dioxide recompression circulating system | |
| CN113137287B (en) | Supercritical carbon dioxide circulating system, compressor and turbine thermal state starting method | |
| CN113137287A (en) | Supercritical carbon dioxide circulating system and hot-state starting method of compressor and turbine | |
| CN116753049A (en) | Start-stop method of supercritical carbon dioxide circulation system | |
| CN114909196B (en) | Water pumping compression isobaric release air energy storage system and method | |
| CN113983720B (en) | Gain type molten salt energy storage system | |
| CN114483214B (en) | Condensing and high back pressure switching heat supply system | |
| CN216429687U (en) | Supercritical carbon dioxide turbine shaft seal air supply and air leakage recovery system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |