CN111677566A - Improved cylinder cutting heat supply unit flexible frequency modulation operation system and method - Google Patents
Improved cylinder cutting heat supply unit flexible frequency modulation operation system and method Download PDFInfo
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- CN111677566A CN111677566A CN202010444478.9A CN202010444478A CN111677566A CN 111677566 A CN111677566 A CN 111677566A CN 202010444478 A CN202010444478 A CN 202010444478A CN 111677566 A CN111677566 A CN 111677566A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 25
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 230000001360 synchronised effect Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000003245 coal Substances 0.000 abstract description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Classifications
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- 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
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to an improved cylinder-cutting heat supply unit flexible frequency modulation operation system and method. When the unit is used for cutting off the low-pressure cylinder by closing the isolation valve to perform backpressure heat supply operation of the high-intermediate pressure cylinder, the steam inlet control valve and the regulating valve are simultaneously controlled by the frequency modulation controller, synchronous regulation of steam inlet quantity and heat supply steam extraction quantity of the unit is realized, in a normal operation mode, the steam inlet control valve is fully opened, the regulating valve is used for performing flexible frequency modulation control, when the normal frequency modulation range is exceeded, the steam inlet control valve participates in regulation and serves as a supplementary frequency modulation mode, and in a non-heat supply season, the regulating valve is closed, and the steam inlet control valve is completely used for performing frequency modulation control, so that the flexible frequency modulation operation of. The invention can reduce the power supply coal consumption and improve the average running efficiency of the high-pressure cylinder.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a flexible frequency modulation operation system and method for an improved cylinder-cutting heat supply unit.
Background
The central heating of a large cogeneration unit is currently in a new trend of new energy consumption and deep peak regulation, the heat supply capacity can be increased by removing the heat supply modification of a low-pressure cylinder, and the deep peak regulation capacity of the unit can be increased, so that the central heating of the large cogeneration unit is popularized more in the industry in this year.
For a large-scale cogeneration unit, particularly after the low-pressure cylinder is removed for operation, the unit pumping condensing operation mode is changed into a back pressure heat supply combined power generation operation mode, the operation mode is changed greatly, the back pressure heat supply operation leads to the electricity utilization by heat, and the peak regulation of the unit is influenced to a certain extent.
Especially, the problem of new energy consumption is outstanding at present, and the requirements on deep peak regulation and frequency modulation operation of the heat supply unit are still higher. The traditional steam admission adjusting mode is adopted to carry out primary frequency modulation control, so that the frequency modulation quality can not meet the scheduling requirement easily, and the operation economy is not optimal after the frequency modulation quality is checked frequently.
For cutting off the low-pressure cylinder heat supply operation unit, a better frequency modulation control operation method needs to be researched from the aspects of energy saving regulation and frequency modulation quality.
Disclosure of Invention
The invention aims to provide an improved cylinder-cutting heat supply unit flexible frequency modulation operation system and method, wherein a flexible frequency modulation controller is arranged and a proper control algorithm is adopted, so that when cylinder-cutting heat supply is operated, a fully-opened unit steam inlet control valve is preferentially adopted, a heat supply network heater steam inlet adjusting valve is used for response adjustment, and the heat storage capacity of a heat supply steam extraction pipeline and a large-capacity heat supply network water pipeline is fully utilized to realize instantaneous power adjustment on a unit, so that the aim of primary frequency modulation is fulfilled, the steam inlet throttling loss of the unit is reduced, the frequency modulation response quality is improved, and energy-saving frequency modulation is realized.
The invention provides an improved cylinder-cutting heat supply unit flexible frequency modulation operation system, which comprises a steam turbine high-medium pressure cylinder, a low-pressure cylinder, a heat supply network heater, a frequency modulation controller, an isolation valve, a regulating valve, a steam inlet control valve and a heat supply network water pipeline, wherein the steam turbine high-medium pressure cylinder is connected with the low-pressure cylinder through the isolation valve;
the middle cylinder steam exhaust port of the high and middle pressure cylinder is connected with the inlet of the low pressure cylinder through a communicating pipeline and an isolation valve on the pipeline; the middle cylinder steam exhaust port of the high and middle pressure cylinder is connected with the steam side inlet of the heating network heater through a communicating pipeline and a regulating valve on the pipeline; the water side inlet and outlet of the heat supply network heater are connected with a heat supply network water pipeline; the steam inlet control valve is connected with a steam inlet of the high and medium pressure cylinder through a steam pipeline; the input ports of the frequency modulation controller are connected through cables and are used for receiving frequency modulation demand instructions and calculating given signals as the controller; and the output port of the frequency modulation controller is connected with the signal input port of the steam inlet control valve and the signal input port of the regulating valve through cables.
The invention also provides a frequency modulation operation method of the system, which comprises the following steps:
when the unit cuts off the low-pressure cylinder by closing the isolation valve to carry out back pressure heat supply operation of the high and medium pressure cylinders, the steam inlet control valve and the regulating valve are simultaneously controlled by the frequency modulation controller, so that the steam inlet quantity regulation and the heat supply steam extraction quantity synchronous regulation of the unit are realized;
under a normal frequency modulation operation mode, the frequency modulation controller sends a command to fully open the steam inlet control valve by 100 percent, and simultaneously sends a command to flexibly modulate the frequency of the regulating valve; when the frequency of the steam is beyond the normal frequency modulation range, the frequency modulation controller sends an instruction to enable the steam inlet control valve to participate in adjustment to serve as a supplementary frequency modulation mode; in non-heat supply seasons, the regulating valve is closed, and the frequency modulation controller only sends an instruction to the steam inlet control valve for frequency modulation control, so that the flexible frequency modulation operation of the unit under different conditions is realized.
By means of the scheme, through the improved cylinder-cutting heat supply unit flexible frequency modulation operation system and method, firstly, when the cylinder-cutting operation unit normally supplies heat and modulates frequency, the frequency modulation controller calculates and sends a frequency modulation demand instruction, and the control operation of the unit primary frequency modulation can be realized only by instantly controlling the opening of the regulating valve and keeping the steam inlet control valve fully open, so that the steam inlet throttling loss of the unit is minimum and the high-medium pressure 1 efficiency is ensured; the control valve and the regulating valve can be synchronously operated through the frequency modulation controller, the operation requirement of larger primary frequency modulation action is realized, the control quality of the primary frequency modulation of the unit is always ensured, and the scheduling and checking loss in the hot season is reduced. Compared with a conventional single steam admission throttling primary frequency modulation control mode, the steam admission throttling primary frequency modulation control method for a typical 300WM cylinder-cutting heat supply unit can reduce the power supply coal consumption rate by about 0.5g/kwh, improve the average running efficiency of a high-pressure cylinder by 1 percent and reduce the checked loss by 500 ten thousand yuan in one heat supply season.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Drawings
Fig. 1 is a schematic structural diagram of a flexible frequency modulation operation system of an improved cylinder-cutting heat supply unit.
Reference numbers in the figures:
1-high and medium pressure cylinder of steam turbine; 2-low pressure cylinder; 3-a heating network heater; 4-a frequency modulation controller; 5-an isolation valve; 6-adjusting the valve; 7-a steam inlet control valve; 8-heat supply network water pipeline; 9-frequency modulation demand instruction.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the present embodiment provides a flexible frequency modulation operating system of an improved cylinder cutting heat supply unit, including a high and medium pressure cylinder 1 of a steam turbine, a low pressure cylinder 2, a heating network heater 3, a frequency modulation controller 4, an isolation valve 5, a regulating valve 6, a steam inlet control valve 7, a heating network water pipeline 8, a frequency modulation demand instruction 9 and a connection system thereof, wherein a steam outlet of the medium cylinder of the high and medium pressure cylinder 1 enters an inlet part of the low pressure cylinder 2 through a communication pipeline and the isolation valve 5 on the pipeline; the steam outlet of the middle cylinder of the high and middle pressure cylinder 1 is connected with the steam inlet of the heating network heater 3 through a communicating pipeline and a regulating valve 6 on the pipeline; an inlet and an outlet on the water side of the heat supply network heater 3 are connected with a heat supply network water pipeline 8; the steam inlet control valve 7 is connected with a steam inlet of the high and medium pressure cylinder 1 through a steam pipeline; the input port of the frequency modulation controller 4 is connected through a cable, receives a frequency modulation demand instruction 9 and is used as a controller for calculating a given signal; the output port of the frequency modulation controller 4 is connected with the signal input port of the steam inlet control valve 7 through a cable; the output port of the frequency modulation controller 4 is connected with the signal input port of the regulating valve 6 through a cable.
The improved cylinder cutting heat supply unit flexibility frequency modulation operation method comprises the following steps:
when the unit cuts off the low pressure cylinder 2 by closing the isolation valve 5 to carry out back pressure heat supply operation of the high and medium pressure cylinder 1, in order to ensure continuous and stable heat supply and the response quality of the unit primary frequency modulation, the flexible frequency modulation controller 4 is adopted to simultaneously control the steam inlet control valve 7 and the regulating valve 6, so that the steam inlet quantity regulation and the heat supply steam extraction quantity synchronous regulation of the unit are realized.
Under a normal frequency modulation operation mode, the frequency modulation controller 4 sends a command to fully open the steam inlet control valve 7 by 100 percent, and simultaneously sends a command to flexibly modulate the frequency of the regulating valve 6; when the frequency of the steam exceeds the normal frequency modulation range, the frequency modulation controller 4 sends a command to enable the steam inlet control valve 7 to participate in regulation to serve as a supplementary frequency modulation mode; in non-heat supply seasons, the regulating valve 6 is closed, and the frequency modulation controller 4 only sends an instruction to the steam inlet control valve 7 for frequency modulation control, so that the flexible frequency modulation operation of the unit under different conditions is realized.
When the cylinder-cutting operation unit normally supplies heat and modulates frequency, the frequency modulation controller 4 calculates and sends a frequency modulation demand instruction 9, and the control operation of the primary frequency modulation of the unit can be realized only by instantly controlling the opening of the regulating valve 6 and keeping the steam inlet control valve 7 fully open, so that the steam inlet throttling loss of the unit is minimum and the efficiency of the high-medium pressure cylinder 1 is ensured.
When the frequency modulation demand is large, the control valve 7 and the regulating valve 6 can be synchronously operated through the frequency modulation controller 4, the operation requirement of larger primary frequency modulation action is realized, the control quality of the primary frequency modulation of the unit is always ensured, and the scheduling and checking loss in a heating season is reduced. Compared with a conventional single steam admission throttling primary frequency modulation control mode, the steam admission throttling primary frequency modulation control method for a typical 300WM cylinder-cutting heat supply unit can reduce the power supply coal consumption rate by about 0.5g/kwh, improve the average running efficiency of a high-pressure cylinder by 1 percent and reduce the checked loss by 500 ten thousand yuan in one heat supply season.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. An improved cylinder-cutting heat supply unit flexibility frequency modulation operation system comprises a steam turbine high and medium pressure cylinder, a low pressure cylinder, a heat supply network heater, a frequency modulation controller, an isolation valve, a regulating valve, a steam inlet control valve and a heat supply network water pipeline;
the middle cylinder steam exhaust port of the high and middle pressure cylinder is connected with the inlet of the low pressure cylinder through a communicating pipeline and an isolation valve on the pipeline; the middle cylinder steam exhaust port of the high and middle pressure cylinder is connected with the steam side inlet of the heating network heater through a communicating pipeline and a regulating valve on the pipeline; the water side inlet and outlet of the heat supply network heater are connected with a heat supply network water pipeline; the steam inlet control valve is connected with a steam inlet of the high and medium pressure cylinder through a steam pipeline; the input ports of the frequency modulation controller are connected through cables and are used for receiving frequency modulation demand instructions and calculating given signals as the controller; and the output port of the frequency modulation controller is connected with the signal input port of the steam inlet control valve and the signal input port of the regulating valve through cables.
2. A method of operation of an improved cylinder cutting heating unit flexibility fm operation system as claimed in claim 1, comprising:
when the unit cuts off the low-pressure cylinder by closing the isolation valve to carry out back pressure heat supply operation of the high and medium pressure cylinders, the steam inlet control valve and the regulating valve are simultaneously controlled by the frequency modulation controller, so that the steam inlet quantity regulation and the heat supply steam extraction quantity synchronous regulation of the unit are realized;
under a normal frequency modulation operation mode, the frequency modulation controller sends a command to fully open the steam inlet control valve by 100 percent, and simultaneously sends a command to flexibly modulate the frequency of the regulating valve; when the frequency of the steam is beyond the normal frequency modulation range, the frequency modulation controller sends an instruction to enable the steam inlet control valve to participate in adjustment to serve as a supplementary frequency modulation mode; in non-heat supply seasons, the regulating valve is closed, and the frequency modulation controller only sends an instruction to the steam inlet control valve for frequency modulation control, so that the flexible frequency modulation operation of the unit under different conditions is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010444478.9A CN111677566A (en) | 2020-05-23 | 2020-05-23 | Improved cylinder cutting heat supply unit flexible frequency modulation operation system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010444478.9A CN111677566A (en) | 2020-05-23 | 2020-05-23 | Improved cylinder cutting heat supply unit flexible frequency modulation operation system and method |
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| CN111677566A true CN111677566A (en) | 2020-09-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108035777A (en) * | 2018-01-08 | 2018-05-15 | 西安西热节能技术有限公司 | A kind of fired power generating unit mesolow cylinder combines zero output heating system and method |
| CN207688230U (en) * | 2017-11-10 | 2018-08-03 | 新疆电力建设调试所有限责任公司 | A kind of thermal power plant unit primary frequency modulation control system |
| WO2018233024A1 (en) * | 2017-06-22 | 2018-12-27 | 赫普热力发展有限公司 | Thermoelectric decoupling peak load regulating system |
| CN110531719A (en) * | 2019-08-27 | 2019-12-03 | 赫普能源环境科技有限公司 | A kind of fired power generating unit coordinated control peak-frequency regulation system, apparatus and method |
| CN212958789U (en) * | 2020-05-23 | 2021-04-13 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Jar heat supply unit flexibility frequency modulation operating system is cut to improved generation |
-
2020
- 2020-05-23 CN CN202010444478.9A patent/CN111677566A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018233024A1 (en) * | 2017-06-22 | 2018-12-27 | 赫普热力发展有限公司 | Thermoelectric decoupling peak load regulating system |
| CN207688230U (en) * | 2017-11-10 | 2018-08-03 | 新疆电力建设调试所有限责任公司 | A kind of thermal power plant unit primary frequency modulation control system |
| CN108035777A (en) * | 2018-01-08 | 2018-05-15 | 西安西热节能技术有限公司 | A kind of fired power generating unit mesolow cylinder combines zero output heating system and method |
| CN110531719A (en) * | 2019-08-27 | 2019-12-03 | 赫普能源环境科技有限公司 | A kind of fired power generating unit coordinated control peak-frequency regulation system, apparatus and method |
| CN212958789U (en) * | 2020-05-23 | 2021-04-13 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Jar heat supply unit flexibility frequency modulation operating system is cut to improved generation |
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