CN114658679A - Supercritical carbon dioxide cycle power generation compressor control system - Google Patents
Supercritical carbon dioxide cycle power generation compressor control system Download PDFInfo
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- CN114658679A CN114658679A CN202210243275.2A CN202210243275A CN114658679A CN 114658679 A CN114658679 A CN 114658679A CN 202210243275 A CN202210243275 A CN 202210243275A CN 114658679 A CN114658679 A CN 114658679A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 36
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 36
- 238000010248 power generation Methods 0.000 title claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 53
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 15
- 230000007423 decrease Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a supercritical carbon dioxide cycle power generation compressor control system, which comprises a control system, a high-pressure cache tank, a low-pressure cache tank, a first regulating valve, a second regulating valve, a pressure stabilizing tank and a compressor, wherein the high-pressure cache tank is connected with the high-pressure cache tank; an outlet of the high-pressure cache tank is communicated with an inlet of the pressure stabilizing tank through a first regulating valve, an outlet of the high-pressure cache tank is communicated with an inlet of the compressor, and an outlet of the high-pressure cache tank is communicated with an inlet of the low-pressure cache tank through a second regulating valve; the control system is connected with the compressor, the first regulating valve and the second regulating valve, and the system can meet the requirement that the flow of the system is quickly increased or reduced according to the power generation requirement in the supercritical carbon dioxide generator set.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and relates to a supercritical carbon dioxide cycle power generation compressor control system.
Background
The conventional thermal power plant has developed a bottleneck in improving the cycle efficiency, and the efficiency problem of the turboset is solved by only depending on the initial parameters of the lifting unit, and the conventional thermal power plant is limited by high-temperature and high-pressure materials. At present, supercritical carbon dioxide power generation breaks through the theoretical research stage, a test power plant is built in China, a compressor is used as a supercritical carbon dioxide unit to provide a working medium flowing power source for a system, the compressor becomes the most important auxiliary machine of the supercritical carbon dioxide power generation unit, and how to quickly and stably control the pressure required by the power generation of the unit becomes important in the current research.
At present, the compressor has not been studied in the aspect of rapidly increasing or reducing the system flow rate according to the power generation requirement in the supercritical carbon dioxide generator power generation set.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a supercritical carbon dioxide cycle power generation compressor control system which can meet the requirement that a compressor quickly increases or decreases the flow of the system in a supercritical carbon dioxide generator power generation set according to the power generation requirement.
In order to achieve the aim, the supercritical carbon dioxide cycle power generation compressor control system comprises a control system, a high-pressure cache tank, a low-pressure cache tank, a first regulating valve, a second regulating valve, a pressure stabilizing tank and a compressor;
an outlet of the high-pressure cache tank is communicated with an inlet of the pressure stabilizing tank through a first regulating valve, an outlet of the high-pressure cache tank is communicated with an inlet of the compressor, and an outlet of the high-pressure cache tank is communicated with an inlet of the low-pressure cache tank through a second regulating valve; the control system is connected with the compressor, the first regulating valve and the second regulating valve.
The control system comprises a pressure signal input end of a pressure stabilizing tank, a system load-up signal input end, a first function module, a second function module, a first large selection block, a first small selection block, a first PID controller, a first time delay block, a first switching block, a first regulating valve instruction output end, a third function module, a fourth function module, a system load-down signal input end, a second large selection block, a second small selection block, a second PID controller, a second time delay block, a second switching block, a second regulating valve instruction output end, a preset carbon dioxide flow set value input end, a compressor PID control block, a compressor frequency signal output end and a main system flow signal input end;
the system comprises a main system flow signal input end, a main system flow signal output end, a main system flow signal output end, a main system flow signal output end, a main system flow signal output end, a main system output end and a main system output end, a main flow signal output end, a compressor PID control;
the output end of the third function module and the output end of the second small selection block are connected with the input end of the second large selection block, the output end of the fourth function module and the output end of the second large selection block are connected with the input end of the second small selection block, the pressure signal input end of the pressure stabilizing tank and the output end of the second large selection block are connected with the input end of the second PID controller, the system load reducing signal input end is connected with the input end of the second switching block through the second delay block, the output end of the second PID controller is connected with the input end of the second switching block, and the output end of the second switching block is connected with the control end of the second regulating valve through the command output end of the second regulating valve;
the preset carbon dioxide flow set value input end is connected with the input end of the compressor PID control block, and the output end of the compressor PID control block is connected with the control end of the compressor through the compressor frequency signal output end.
The outlet of the high-pressure buffer tank is communicated with the inlet of the pressure stabilizing tank through a first check valve.
The outlet of the high-pressure buffer tank is communicated with the inlet of the low-pressure buffer tank through a second check valve.
The outlet of the high-pressure buffer tank is communicated with the inlet of the compressor through the inlet door of the compressor.
The outlet of the compressor is communicated with the outlet door of the compressor and the steam exhaust pipeline.
The outlet of the compressor is communicated with the high-pressure buffer tank through the compressor anti-surge regulating valve.
The system also comprises a system air return pipeline which is communicated with the inlet of the high-pressure cache tank.
The invention has the following beneficial effects:
when the supercritical carbon dioxide cycle power generation compressor control system is in specific operation, the pressure of the pressure stabilizing tank and the frequency of the compressor are changed to be matched with each other to realize wide-range flow adjustment, namely, the frequency of the compressor is changed to realize rapid increase or decrease of the system pressure, under the condition of unchanged temperature, the system flow is in direct proportion to the system pressure, at the moment, the system flow is rapidly increased or decreased through the realization, when the pressure at the inlet of the compressor limits the increase or decrease of the frequency of the compressor, the pressure of the pressure stabilizing tank is changed through changing the states of the first regulating valve and the second regulating valve, the pressure at the inlet of the compressor is changed to realize wide-range flow adjustment, and then the requirement that the flow of the system is rapidly increased or decreased according to the power generation requirement of the compressor in a supercritical carbon dioxide generator set is met.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a control circuit diagram of the present invention.
Wherein, 1 is a high pressure buffer tank, 2 is a low pressure buffer tank, 3 is a first regulating valve, 4 is a first check valve, 5 is a second check valve, 6 is a second regulating valve, 7 is a surge tank, 8 is a compressor inlet door, 9 is a compressor, 10 is a compressor surge-proof regulating valve, 11 is a compressor outlet door, 12 is a system return air pipeline, 13 is a pressure signal input end of the surge tank, 14 is a system load-up signal input end, 15 is a first function module, 16 is a second function module, 17 is a first large selection block, 18 is a first small selection block, 19 is a first PID controller, 20 is a first delay block, 21 is a first switching block, 22 is a first regulating valve instruction output end, 23 is a third function module, 24 is a fourth function module, 25 is a system load-down signal input end, 26 is a second large selection block, 27 is a second small selection block, 28 is a second PID controller, 29 is a second delay block, 30 is a second switching block, 31 is a second regulating valve instruction output end, 32 is a preset carbon dioxide flow set value input end, 33 is a compressor PID control block, 34 is a compressor frequency signal output end, and 35 is a main system flow signal input end.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. 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.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of the various regions, layers and their relative sizes, positional relationships are shown in the drawings as examples only, and in practice deviations due to manufacturing tolerances or technical limitations are possible, and a person skilled in the art may additionally design regions/layers with different shapes, sizes, relative positions, according to the actual needs.
Referring to fig. 1, the supercritical carbon dioxide cycle power generation compressor control system according to the present invention includes a control system, a high pressure buffer tank 1, a low pressure buffer tank 2, a first regulating valve 3, a first check valve 4, a second check valve 5, a second regulating valve 6, a surge tank 7, a compressor inlet gate 8, a compressor 9, a compressor anti-surge regulating valve 10, a compressor outlet gate 11, and a system return air pipe 12;
the outlet of the high-pressure cache tank 1 is communicated with the inlet of the pressure stabilizing tank 7 through the first regulating valve 3 and the first check valve 4, the system air return pipeline 12 is communicated with the inlet of the high-pressure cache tank 1, the outlet of the high-pressure cache tank 1 is communicated with the inlet of the compressor 9 through the compressor inlet door 8, the outlet of the compressor 9 is divided into two paths, one path is communicated with the compressor outlet door 11, the other path is communicated with the high-pressure cache tank 1 through the compressor anti-surge regulating valve 10, and the outlet of the high-pressure cache tank 1 is communicated with the inlet of the low-pressure cache tank 2 through the second regulating valve 6 and the second check valve 5.
The control system comprises a pressure signal input end 13 of a pressure stabilizing tank, a system load-increasing signal input end 14, a first function module 15, a second function module 16, a first large selection block 17, a first small selection block 18, a first PID controller 19, a first delay block 20, a first switching block 21, a first regulating valve instruction output end 22, a third function module 23, a fourth function module 24, a system load-reducing signal input end 25, a second large selection block 26, a second small selection block 27, a second PID controller 28, a second delay block 29, a second switching block 30, a second regulating valve instruction output end 31, a preset carbon dioxide flow set value input end 32, a compressor PID control block 33, a compressor frequency signal output end 34 and a main system flow signal input end 35;
the main system flow signal input 35 is connected to the input of the first function module 15, the input of the second function module 16, the input of the third function module 23, the input of the fourth function module 24 and the input of the compressor PID control block 33, the output end of the first function module 15 and the output end of the first small selection block 18 are connected with the input end of the first large selection block 17, the output end of the first large selection block 17 and the output end of the second function module 16 are connected with the input end of the first small selection block 18, the output end of the first large selection block 17 and the pressure signal input end 13 of the surge tank are connected with the input end of the first PID controller 19, the system load-up signal input end 14 is connected with the input end of the first switching block 21 through the first delay block 20, and the output end of the first switching block 21 is connected with the control end of the first regulating valve 3 through the command output end 22 of the first regulating valve;
the output end of the third function module 23 and the output end of the second small block 27 are connected with the input end of the second large block 26, the output end of the fourth function module 24 and the output end of the second large block 26 are connected with the input end of the second small block 27, the surge tank pressure signal input end 13 and the output end of the second large block 26 are connected with the input end of the second PID controller 28, the system load reducing signal input end 25 is connected with the input end of the second switching block 30 through the second delay block 29, the output end of the second PID controller 28 is connected with the input end of the second switching block 30, and the output end of the second switching block 30 is connected with the control end of the second regulating valve 6 through the second regulating valve instruction output end 31.
The preset carbon dioxide flow set value input end 32 is connected with the input end of a compressor PID control block 33, and the output end of the compressor PID control block 33 is connected with the control end of the compressor 9 through a compressor frequency signal output end 34.
The specific working process of the invention is as follows:
when the system load is true, the system is switched to automatic control through a first switching block 21, wherein a hysteresis function setting module is formed by a first large selection block 17 and a first small selection block 18 of a first function module 15 and a second function module 16, and the hysteresis function enables the set pressure of the surge tank 7 to have a certain dead zone, so that the frequent change of the set value to cause the frequent change of the output of a first PID controller 19 is prevented, namely the command of a first regulating valve 3 frequently adjusts the system to cause interference; when the system load is 0, the adjustment is continued for a period of time through the first delay block 20; when the system load reduction is true, the instruction of the second regulating valve 6 is switched to automatic control through the second switching block 30, the third function module 23 and the fourth function module 24 form a hysteresis function setting module through the second large selection block 26 and the second small selection block 27, the hysteresis function enables the set pressure of the surge tank 7 to have a certain dead zone, the frequent change of the set value, which causes the frequent change of the output of the second PID controller 28, is prevented, namely the instruction of the second regulating valve 6 frequently adjusts the system to cause interference, and when the system load reduction is 0, the adjustment is continued for a period of time through the second delay block 29.
In addition, the pressure of the pressure stabilizing tank 7 is controlled to keep a certain adjustable margin for the compressor 9, and the PID control block 33 of the compressor is used for adjusting the frequency of the compressor 9 in a closed loop mode through presetting the flow set value required by the system.
It should be noted that, the first function module 15 and the second function module 16 preliminarily set that there is a deviation of 0.8MPa between the two functions, that is, there is a dead zone of 0.8MPa, the third function module 23 and the fourth function module 24 preliminarily set that there is a deviation of 0.8MPa between the two functions, that is, there is a dead zone of 0.8MPa, after the variable load is finished, the delay times of the first delay block 20 and the second delay block 29 are both set to be 60 seconds, the first check valve 4 and the second check valve 5 can ensure the flow direction of carbon dioxide in the system, and when the pressure of the low-pressure buffer tank 2 is high, the stored carbon dioxide can be delivered to the carbon dioxide processing system for reuse.
In addition, because the pressure ratio of the compressor 9 is limited by the surge curve, after the inlet pressure of the compressor 9 is changed, the frequency of the compressor 9 can be changed by changing the preset carbon dioxide flow set value, so that the carbon dioxide flow of the unit can be changed rapidly to meet the carbon dioxide flow demand of the system, and in addition, when the flow of the system is low, the compressor anti-surge regulating valve 10 is opened to prevent the compressor 9 from being damaged due to surge.
Claims (8)
1. A supercritical carbon dioxide cycle power generation compressor control system is characterized by comprising a control system, a high-pressure cache tank (1), a low-pressure cache tank (2), a first regulating valve (3), a second regulating valve (6), a pressure stabilizing tank (7) and a compressor (9);
an outlet of the high-pressure cache tank (1) is communicated with an inlet of the pressure stabilizing tank (7) through a first regulating valve (3), an outlet of the high-pressure cache tank (1) is communicated with an inlet of the compressor (9), and an outlet of the high-pressure cache tank (1) is communicated with an inlet of the low-pressure cache tank (2) through a second regulating valve (6); the control system is connected with the compressor (9), the first regulating valve (3) and the second regulating valve (6).
2. The supercritical carbon dioxide cycle power generation compressor control system according to claim 1, wherein the control system comprises a surge tank pressure signal input (13), a system load-up signal input (14), a first function module (15), a second function module (16), a first large selection block (17), a first small selection block (18), a first PID controller (19), a first delay block (20), a first switching block (21), a first regulating valve command output (22), a third function module (23), a fourth function module (24), a system load-down signal input (25), a second large selection block (26), a second small selection block (27), a second PID controller (28), a second delay block (29), a second switching block (30), a second regulating valve command output (31), a preset carbon dioxide flow set value input (32), and a preset carbon dioxide flow set value input, A compressor PID control block (33), a compressor frequency signal output end (34) and a main system flow signal input end (35);
the main system flow signal input end (35) is connected with the input end of a first function module (15), the input end of a second function module (16), the input end of a third function module (23), the input end of a fourth function module (24) and the input end of a compressor PID control block (33), the output end of the first function module (15) and the output end of a first small selection block (18) are connected with the input end of a first large selection block (17), the output end of the first large selection block (17) and the output end of the second function module (16) are connected with the input end of the first small selection block (18), the output end of the first large selection block (17) and the pressure signal input end (13) of a pressure stabilizing tank are connected with the input end of a first PID controller (19), the system load-up signal input end (14) is connected with the input end of a first switching block (21) through a first delay block (20), the output end of the first switching block (21) is connected with the control end of the first regulating valve (3) through a first regulating valve instruction output end (22);
the output end of a third function module (23) and the output end of a second small selection block (27) are connected with the input end of a second large selection block (26), the output end of a fourth function module (24) and the output end of the second large selection block (26) are connected with the input end of the second small selection block (27), the pressure signal input end (13) of a surge tank and the output end of the second large selection block (26) are connected with the input end of a second PID controller (28), the system load reduction signal input end (25) is connected with the input end of a second switching block (30) through a second delay block (29), the output end of the second PID controller (28) is connected with the input end of a second switching block (30), and the output end of the second switching block (30) is connected with the control end of a second regulating valve (6) through a second regulating valve instruction output end (31);
the preset carbon dioxide flow set value input end (32) is connected with the input end of a compressor PID control block (33), and the output end of the compressor PID control block (33) is connected with the control end of the compressor (9) through a compressor frequency signal output end (34).
3. The compressor control system for supercritical carbon dioxide cycle power generation according to claim 1, characterized in that the outlet of the high pressure buffer tank (1) is connected to the inlet of the surge tank (7) via a first check valve (4).
4. The compressor control system for supercritical carbon dioxide cycle power generation according to claim 3 is characterized in that the outlet of the high pressure buffer tank (1) is communicated with the inlet of the low pressure buffer tank (2) through a second check valve (5).
5. The compressor control system for supercritical carbon dioxide cycle power generation according to claim 1, characterized in that the outlet of the high pressure buffer tank (1) is connected to the inlet of the compressor (9) via a compressor inlet door (8).
6. The compressor control system for supercritical carbon dioxide cycle power generation according to claim 1, characterized in that the outlet of the compressor (9) and the compressor outlet door (11) are in communication with an exhaust pipe.
7. The supercritical carbon dioxide cycle power generation compressor control system according to claim 1, characterized in that the outlet of the compressor (9) is in communication with the high pressure buffer tank (1) via a compressor anti-surge regulating valve (10).
8. The supercritical carbon dioxide cycle power generation compressor control system according to claim 1 further comprising a system return gas line (12), the system return gas line (12) being in communication with an inlet of the high pressure buffer tank (1).
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| CN202210243275.2A CN114658679A (en) | 2022-03-11 | 2022-03-11 | Supercritical carbon dioxide cycle power generation compressor control system |
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| CN202210243275.2A CN114658679A (en) | 2022-03-11 | 2022-03-11 | Supercritical carbon dioxide cycle power generation compressor control system |
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2022
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