CN210889045U - High-flexibility peak shaving thermodynamic system of secondary reheating unit - Google Patents
High-flexibility peak shaving thermodynamic system of secondary reheating unit Download PDFInfo
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- CN210889045U CN210889045U CN201921296602.0U CN201921296602U CN210889045U CN 210889045 U CN210889045 U CN 210889045U CN 201921296602 U CN201921296602 U CN 201921296602U CN 210889045 U CN210889045 U CN 210889045U
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Abstract
The utility model relates to a high flexibility secondary reheating unit peak regulation thermodynamic system, including high pressure cylinder, low pressure cylinder, high pressure backheat heater, low pressure backheat heater, high pressure backheat heater bypass valve, low pressure backheat heater bypass valve, main steam line, benefit vapour bypass valve, water supply line, condensate pipe way, condenser bypass valve, exhaust steam line, circulating water inlet pipe way and circulating water outlet pipe way. The utility model discloses can guarantee that high parameter secondary reheat unit admission valve under any operating mode of normal operating is opened entirely and make admission throttle loss be zero, improve high pressure cylinder efficiency by a wide margin more than 92%, the peak shaving rate that can satisfy high-power secondary reheat unit simultaneously reaches more than 5%, the peak shaving means compares traditional admission moreover and adjusts a mode more various agility activation, can be better energy-conserving, the fluctuation of high efficiency system merit, more be favorable to big unit peak shaving flexibility and absorb the new forms of energy.
Description
Technical Field
The utility model belongs to the technical field of thermal power, especially, relate to a high flexibility secondary reheating unit peak shaving thermodynamic system.
Background
The twice-reheated million ultra-supercritical units are put into production in China for nearly four years, the power generation efficiency reaches over 48%, the power generation coal consumption rate creates the level of world record, and the twice-reheated million ultra-supercritical units contribute to energy conservation and emission reduction and become research hotspots.
For a high-parameter twice-reheating million turboset, due to the situation of energy revolution and energy development in China, high-efficiency and quick peak regulation capacity and flexibility are inevitably required to be provided so as to ensure the increasing new energy consumption capacity and further realize the cleanness and high efficiency of the energy utilization of the whole society.
The operation experience at home and abroad of the secondary reheating unit shows that the heat capacity of the whole unit is increased and the thermal inertia is also increased due to the addition of a set of reheating system, so that the operation regulation and the automatic control of the unit are challenged.
Particularly, the operation time of the secondary reheating unit is not long in China, the peak regulation capacity of the unit on the machine side is limited and the flexibility is insufficient except that the control of the reheating steam temperature on the furnace side is a difficult point, and the secondary reheating unit is an important problem facing at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high flexibility secondary reheating unit peak regulation thermodynamic system, through the feedwater by-pass valve that sets up high pressure backheat heater, the condensate water by-pass valve of low pressure backheat heater and the main steam supply by-pass valve of high pressure cylinder, the high flexibility peak regulation system of unit is constituteed to condenser circulating water by-pass valve, can be when the unit becomes the load, under the prerequisite that keeps high pressure cylinder main steam admission valve full open, adjust above-mentioned valve and realize unit power and adjust in the twinkling of an eye, realize the load quick response of unit with full play steam turbine and thermodynamic system's heat-retaining energy.
The utility model provides a high flexibility peak regulation thermodynamic system of a secondary reheating unit, which comprises a high-pressure cylinder, a low-pressure cylinder, a high-pressure regenerative heater, a low-pressure regenerative heater, a high-pressure regenerative heater bypass valve, a low-pressure regenerative heater bypass valve, a main steam pipeline, a steam compensation bypass valve, a water supply pipeline, a condensed water pipeline, a condenser bypass valve, a steam exhaust pipeline, a circulating water inlet pipeline and a circulating water outlet pipeline;
the exhaust port of the high-pressure cylinder is connected with the inlet port of the low-pressure cylinder through a steam pipeline; the middle steam extraction port of the high-pressure cylinder is connected with the steam inlet port at the steam side of the high-pressure regenerative heater through a pipeline; the middle steam extraction port of the low-pressure cylinder is connected with the steam inlet port at the steam side of the low-pressure regenerative heater through a pipeline;
the water supply side inlet of the high-pressure regenerative heater is connected with the inlet of the high-pressure regenerative heater bypass valve, and the water supply side outlet of the high-pressure regenerative heater is connected with the outlet of the high-pressure regenerative heater bypass valve; the condensed water side inlet of the low-pressure regenerative heater is connected with the inlet of the low-pressure regenerative heater bypass valve, and the condensed water side outlet of the low-pressure regenerative heater is connected with the outlet of the low-pressure regenerative heater bypass valve; the outlet of the high-pressure regenerative heater is connected with the water supply pipeline; the inlet of the low-pressure regenerative heater is connected with the condensed water pipeline;
the main steam pipeline is connected with the middle stage of the high-pressure cylinder through the steam supplementing bypass valve; the main steam pipeline is connected with a steam inlet of the high-pressure cylinder through a pipeline; the exhaust port of the low-pressure cylinder is connected with the exhaust pipeline through a pipeline; the steam exhaust pipeline is connected with a steam side inlet of the condenser through a pipeline;
a circulating water side inlet of the condenser is connected with an inlet of the condenser bypass valve through a pipeline, and a circulating water side outlet of the condenser is connected with an outlet of the condenser bypass valve through a pipeline;
the circulating water inlet pipeline is connected with a circulating water side inlet of the condenser through a pipeline; and the circulating water outlet pipeline is connected with a circulating water side outlet of the condenser through a pipeline.
By means of the scheme, through the peak regulation thermodynamic system of the high-flexibility secondary reheating unit, the full opening of the steam inlet valve of the high-parameter secondary reheating unit under any working condition of normal operation can be guaranteed, so that the steam inlet throttling loss is zero, the efficiency of the high-pressure cylinder is greatly improved to more than 92%, meanwhile, the peak regulation rate of the high-power secondary reheating unit can reach more than 5%, compared with the traditional steam inlet regulation mode, the peak regulation method is more diversified and flexible, better energy conservation can be achieved, the active fluctuation of the system is efficiently realized, and the peak regulation flexibility and the new energy consumption of the large unit are facilitated.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Fig. 1 is the utility model discloses a high flexibility secondary reheating unit peak shaving thermodynamic system's schematic structure.
Reference numbers in the figures:
1-high pressure cylinder; 2-a low pressure cylinder; 3-high pressure backheating heater; 4-low pressure backheating heater; 5-high pressure backheating heater bypass valve; 6-low pressure backheating heater bypass valve; 7-main steam line; 8-a steam compensation bypass valve; 9-water supply pipeline; 10-condensate line; 11-a condenser; 12-a condenser bypass valve; 13-steam exhaust pipeline; 14-a circulating water inlet pipeline; 15-circulating water outlet pipeline.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to 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 peak-shaving thermodynamic system of a high-flexibility secondary reheating unit, including a high-pressure cylinder 1, a low-pressure cylinder 2, a high-pressure regenerative heater 3, a low-pressure regenerative heater 4, a high-pressure regenerative heater bypass valve 5, a low-pressure regenerative heater bypass valve 6, a main steam pipeline 7, a steam make-up bypass valve 8, a water supply pipeline 9, a condensed water pipeline 10, a condenser 11, a condenser bypass valve 12, a steam exhaust pipeline 13, a circulating water inlet pipeline 14, and a circulating water outlet pipeline 15;
the exhaust port of the high-pressure cylinder 1 is connected with the inlet port of the low-pressure cylinder 2 through a steam pipeline; the middle steam extraction port of the high-pressure cylinder 1 is connected with the steam inlet port at the steam side of the high-pressure regenerative heater 3 through a pipeline; the middle steam extraction port of the low-pressure cylinder 2 is connected with the steam inlet port at the steam side of the low-pressure regenerative heater 4 through a pipeline;
the water supply side inlet of the high-pressure regenerative heater 3 is connected with the inlet of the high-pressure regenerative heater bypass valve 5, and the water supply side outlet of the high-pressure regenerative heater 3 is connected with the outlet of the high-pressure regenerative heater bypass valve 5; the condensed water side inlet of the low-pressure regenerative heater 4 is connected with the inlet of the low-pressure regenerative heater bypass valve 6, and the condensed water side outlet of the low-pressure regenerative heater 4 is connected with the outlet of the low-pressure regenerative heater bypass valve 6; the outlet of the high-pressure regenerative heater 3 is connected with the water supply pipeline 9; the inlet of the low-pressure regenerative heater 4 is connected with the condensed water pipeline 10;
the main steam pipeline 7 is connected with the middle stage of the high-pressure cylinder 1 through the steam-supplementing bypass valve 8 (main steam enters the middle stage of the high-pressure cylinder 1 through the steam-supplementing bypass valve 8 to start work); the main steam pipeline 7 is connected with a steam inlet of the high-pressure cylinder 1 through a pipeline; the exhaust port of the low-pressure cylinder 2 is connected with the exhaust pipeline 13 through a pipeline; the exhaust steam pipeline 13 is connected with a steam side inlet of the condenser 11 through a pipeline;
a circulating water side inlet of the condenser 11 is connected with an inlet of the condenser bypass valve 12 through a pipeline, and a circulating water side outlet of the condenser 11 is connected with an outlet of the condenser bypass valve 12 through a pipeline;
the circulating water inlet pipeline 14 is connected with a circulating water side inlet of the condenser 11 through a pipeline; and the circulating water outlet pipeline 15 is connected with a circulating water side outlet of the condenser 11 through a pipeline.
The high-flexibility peak regulation system of the unit is formed by arranging the high-pressure regenerative heater bypass valve 5 of the high-pressure regenerative heater, the low-pressure regenerative heater bypass valve 6 of the low-pressure regenerative heater, the main steam supplement bypass valve 8 of the high-pressure cylinder and the condenser bypass valve 12 on the thermodynamic system of the secondary reheating unit, so that the instantaneous regulation of the power of the unit can be realized by regulating the valves on the premise of keeping the main steam inlet valve of the high-pressure cylinder fully opened when the load of the unit is changed, and the load quick response of the unit can be realized by fully playing the heat storage energy of the steam turbine and the thermodynamic system thereof.
The method comprises the steps that when variable load demands exist, the bypass valve 6 of the low-pressure regenerative heater is adjusted, so that the flow of condensed water entering the low-pressure regenerative heater 4 of the turbine set is changed instantly, the steam quantity of regenerative steam extraction is further squeezed or increased, and the quick response change of the power of the turbine set is realized. The method for adjusting the power can eliminate about 35% of the requirement of the unit for efficient and rapid peak adjustment.
And the second method is that when the load is required to be changed, the water supply flow entering the high-pressure regenerative heater 3 of the turbine set is instantly changed by adjusting the bypass valve 5 of the high-pressure regenerative heater, so that the steam quantity of regenerative steam extraction is squeezed or increased, and the quick response change of the power of the turbine set is realized. The method for adjusting the power can eliminate about 45% of the high-efficiency and quick peak-shaving requirement of the unit.
In the third method, when variable load is required, the flow of circulating water entering a condenser of the turbine unit is instantly changed by adjusting the bypass valve 12 of the condenser, so that the back pressure of the turbine unit is directly influenced, and the quick response change of the power of the turbine unit is realized. The method for adjusting the power can eliminate about 10% of the high-efficiency and quick peak-shaving requirement of the unit.
And in the fourth method, when the variable load is required, the steam flow entering the high-pressure cylinder 1 of the steam turbine set is instantaneously changed by adjusting the opening of the steam compensation bypass valve 8, so that the main steam flow of the steam turbine set is directly influenced, and the quick response change of the power of the steam turbine set is realized. The method for adjusting the power can eliminate about 5% of the requirement of the unit for efficient and rapid peak adjustment.
The fifth method is that through the combination of the peak shaving methods, the quick peak shaving adjustment response of the unit power can be realized, and 80-100% of the high-efficiency quick peak shaving requirement of the unit can be eliminated. The remaining peak shaver requirement of about 0-20% is then completed by the organic group entering the steam-regulating valve. Under the condition that the peak regulation rate and the peak regulation power are not high, the combined method can realize the full-open operation of the steam inlet regulating valve.
This high nimble peak shaving system can guarantee that high parameter secondary reheating unit admission valve under any operating mode of normal operating is wide open and make admission throttle loss be zero, improve high pressure cylinder efficiency more than 92% by a wide margin, can satisfy the peak shaving rate of high-power secondary reheating unit simultaneously and reach more than 5%, and the peak shaving means compares traditional admission and adjusts a mode and more various flexible activation more to better energy-conservation, the fluctuation of high efficiency system merit, more be favorable to big unit peak shaving flexibility and absorb the new energy.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of 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 (1)
1. A peak regulation thermodynamic system of a high-flexibility secondary reheating unit is characterized by comprising a high-pressure cylinder, a low-pressure cylinder, a high-pressure regenerative heater, a low-pressure regenerative heater, a high-pressure regenerative heater bypass valve, a low-pressure regenerative heater bypass valve, a main steam pipeline, a steam supplementing bypass valve, a water supply pipeline, a condensed water pipeline, a condenser bypass valve, a steam exhaust pipeline, a circulating water inlet pipeline and a circulating water outlet pipeline;
the exhaust port of the high-pressure cylinder is connected with the inlet port of the low-pressure cylinder through a steam pipeline; the middle steam extraction port of the high-pressure cylinder is connected with the steam inlet port at the steam side of the high-pressure regenerative heater through a pipeline; the middle steam extraction port of the low-pressure cylinder is connected with the steam inlet port at the steam side of the low-pressure regenerative heater through a pipeline;
the water supply side inlet of the high-pressure regenerative heater is connected with the inlet of the high-pressure regenerative heater bypass valve, and the water supply side outlet of the high-pressure regenerative heater is connected with the outlet of the high-pressure regenerative heater bypass valve; the condensed water side inlet of the low-pressure regenerative heater is connected with the inlet of the low-pressure regenerative heater bypass valve, and the condensed water side outlet of the low-pressure regenerative heater is connected with the outlet of the low-pressure regenerative heater bypass valve; the outlet of the high-pressure regenerative heater is connected with the water supply pipeline; the inlet of the low-pressure regenerative heater is connected with the condensed water pipeline;
the main steam pipeline is connected with the middle stage of the high-pressure cylinder through the steam supplementing bypass valve; the main steam pipeline is connected with a steam inlet of the high-pressure cylinder through a pipeline; the exhaust port of the low-pressure cylinder is connected with the exhaust pipeline through a pipeline; the steam exhaust pipeline is connected with a steam side inlet of the condenser through a pipeline;
a circulating water side inlet of the condenser is connected with an inlet of the condenser bypass valve through a pipeline, and a circulating water side outlet of the condenser is connected with an outlet of the condenser bypass valve through a pipeline;
the circulating water inlet pipeline is connected with a circulating water side inlet of the condenser through a pipeline; and the circulating water outlet pipeline is connected with a circulating water side outlet of the condenser through a pipeline.
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| CN201921296602.0U CN210889045U8 (en) | 2019-08-08 | 2019-08-08 | High-flexibility peak shaving thermodynamic system of secondary reheating unit |
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| CN201921296602.0U CN210889045U8 (en) | 2019-08-08 | 2019-08-08 | High-flexibility peak shaving thermodynamic system of secondary reheating unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486096A (en) * | 2019-08-08 | 2019-11-22 | 大唐郓城发电有限公司 | A kind of high flexibility double reheat power generation sets peak regulation therrmodynamic system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110486096A (en) * | 2019-08-08 | 2019-11-22 | 大唐郓城发电有限公司 | A kind of high flexibility double reheat power generation sets peak regulation therrmodynamic system and method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CU01 | Correction of utility model |
Correction item: Patentee|Address|Patentee Correct: DATANG YUNCHENG POWER GENERATION Co.,Ltd.|274799 14 / F, Xinghe international office building, Dongxi Road, yuncheng county, Heze City|CHINA DATANG GROUP SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE CO., LTD. THERMAL POWER TECHNOLOGY Research Institute False: DATANG YUNCHENG POWER GENERATION Co.,Ltd.|274799 14/F, Xinghe international office building, Dongxi Road, yuncheng county, Heze City|Thermal Power Technology Research Institute of China Datang Group Science and Technology Research Institute Co.,Ltd. Number: 27-01 Page: The title page Volume: 36 Correction item: Patentee|Address|Patentee Correct: DATANG YUNCHENG POWER GENERATION Co.,Ltd.|274799 14 / F, Xinghe international office building, Dongxi Road, yuncheng county, Heze City|CHINA DATANG GROUP SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE CO., LTD. THERMAL POWER TECHNOLOGY Research Institute False: DATANG YUNCHENG POWER GENERATION Co.,Ltd.|274799 14/F, Xinghe international office building, Dongxi Road, yuncheng county, Heze City|Thermal Power Technology Research Institute of China Datang Group Science and Technology Research Institute Co.,Ltd. Number: 27-01 Volume: 36 |
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| CU01 | Correction of utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200630 Termination date: 20210808 |
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| CF01 | Termination of patent right due to non-payment of annual fee |