CN211174242U - Heating season cogeneration unit on-line electricity load adjusting system - Google Patents
Heating season cogeneration unit on-line electricity load adjusting system Download PDFInfo
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- CN211174242U CN211174242U CN201921883170.3U CN201921883170U CN211174242U CN 211174242 U CN211174242 U CN 211174242U CN 201921883170 U CN201921883170 U CN 201921883170U CN 211174242 U CN211174242 U CN 211174242U
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Abstract
The utility model discloses a combined heat and power units net surfing electric load governing system in heating season has solved how to realize the problem that the net surfing electric load of combined heat and power units was adjusted at great within range in heating season. The main steam heat exchange system and the reheating heat section steam heat exchanger are arranged to reduce the main steam inlet quantity of a high-pressure cylinder of the steam turbine generator unit and the steam inlet quantity of the regeneration heat section steam of the medium-pressure cylinder, so that the power generation load of the high-pressure cylinder and the medium-pressure cylinder of the generator unit is reduced, and the heat exchanged out is used for a heat supply system or other heat-requiring systems through the heat exchange system; in order to overcome the defect of reduced output steam pressure caused by reduced steam of the medium and high pressure cylinder, the steam pressure of the cold section of the steam turbine is improved by arranging the ejector; and injecting a part of reheated hot section steam after heat exchange to the low-pressure cylinder through the injector so as to ensure the minimum steam flow required by low-pressure safe operation and the steam amount required by a low-pressure heater for heating condensed water, and ensure the safety of the operation of the low-pressure cylinder of the unit and the deoxidizing effect of the deaerator.
Description
Technical Field
The invention relates to a cogeneration unit, in particular to a system and a method for adjusting the on-line electric load of the cogeneration unit in a large range in a heating season.
Background
Clean energy such as wind power generation, photovoltaic power generation and the like is accessed to a power grid mainly comprising a thermal power generating set, the power generation capacity of the clean energy is fully exerted in a heating season, the occupation ratio of thermal power generation is reduced, the conventional means for protecting the environment and ensuring power supply is adopted, and the adjustment range of the internet load of the thermal power generating set needs to be enlarged so as to fully exert the power generation capacity of the clean energy; the cogeneration unit generally follows the design concept of deciding power by heat, and in the heating season, the cogeneration unit has lower regulation capacity (generally called as grid power load regulation capacity) of transmitting electric energy to a power grid on the premise of ensuring heat supply, generally 60% -90%, and the reason is that: the combined heat and power generation system is characterized in that the combined heat and power generation system comprises a steam turbine, a steam extraction system, a steam turbine, a steam extraction system, a steam turbine. At present, the regulation capacity range of the on-line electricity load of the conventional cogeneration coal-fired unit is 30-90%, the regulation lower limit is higher, and the on-site requirement cannot be met; in order to increase the regulation capacity of the on-grid electric load of the cogeneration coal-fired unit, the prior art has the following modes: (1) the zero-force transformation of the low-pressure cylinder is carried out, but the zero-force transformation of the low-pressure cylinder can reduce the temperature of condensed water entering a deaerator, so that the deaerator has a deaerating effect, the water quality of boiler feed water is influenced, and the safe operation of a boiler is influenced; (2) the high-low pressure bypass is transformed by reducing the temperature of main steam and reheated steam of a unit through a water spray attemperation valve, so that energy is wasted, and meanwhile, after the bypass is transformed by only utilizing the bypass, the steam pressure of a reheated cold section is not matched with the pressure required by a boiler, so that the steam flow rate of the boiler exceeds the designed flow rate, and potential hazards are brought to the safe operation of the boiler; (3) the capacity of the electric boiler matched with the transformation is very large, generally more than 30% of the rated power generation load of a unit, and the equipment resetting rate is too high.
Disclosure of Invention
The invention provides an on-line electric load adjusting system and an on-line electric load adjusting method for a cogeneration unit in a heating season, and solves the technical problem of adjusting the on-line electric load of the cogeneration unit in a larger range in the heating season.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the main steam heat exchange system and the reheating heat section steam heat exchanger are arranged, the main steam inlet quantity of a high-pressure cylinder of the steam turbine generator unit and the regeneration heat section steam inlet quantity of the medium-pressure cylinder are reduced, so that the power generation load of the high-medium-pressure cylinder of the generator unit is reduced, the heat exchanged out is used for a heat supply system or other heat-requiring systems through the heat exchange system, and the waste of energy is avoided; in order to overcome the defect of reduced output steam pressure caused by reduced steam of a medium-high pressure cylinder, the steam pressure of the cold section of the steam turbine is improved by arranging the ejector so as to meet the requirement of a boiler end and avoid the problem of overspeed of the steam running flow speed of a heat exchange tube in a boiler; and injecting a part of reheated hot section steam after heat exchange to the low-pressure cylinder through the injector so as to ensure the minimum steam flow required by low-pressure safe operation and the steam amount required by a low-pressure heater for heating condensed water, thereby ensuring the safety of the operation of the low-pressure cylinder of the unit and the deoxidizing effect of the deaerator.
An on-line electric load adjusting system of a heating season cogeneration unit comprises a steam boiler, a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, wherein an outlet of a superheater of the steam boiler is communicated with a main steam inlet of the high-pressure cylinder through a main steam pipeline, a steam outlet of the high-pressure cylinder is communicated with a reheater steam inlet of the steam boiler through a reheat cooling section pipeline, a steam outlet of a reheater of the steam boiler is communicated with a steam inlet of the intermediate-pressure cylinder through a reheat heating section pipeline, a steam outlet of the intermediate-pressure cylinder is communicated with a steam inlet of the low-pressure cylinder through an intermediate-pressure cylinder steam outlet pipeline, a steam input pipeline of a peak-shaving main steam heat exchanger is connected to the main steam pipeline, the other end of the steam input pipeline of the peak-shaving main steam heat exchanger is connected with a heat exchange steam inlet of the peak-shaving main steam heat exchanger, and a steam output pipeline of the peak-shaving main steam heat, the other end of the steam output pipeline of the peak-shaving main steam heat exchanger is connected with a high-pressure steam inlet of the peak-shaving main steam ejector, a first shutoff valve is arranged on the steam input pipeline of the peak-shaving main steam heat exchanger, a second shutoff valve is arranged on the steam output pipeline of the peak-shaving main steam heat exchanger, a third shutoff valve is arranged on a reheating cold section pipeline, a low-pressure steam input pipeline of the peak-shaving main steam ejector is arranged on the reheating cold section pipeline between the third shutoff valve and a steam outlet of a high-pressure cylinder, the other end of the low-pressure steam input pipeline of the peak-shaving main steam ejector is connected with a low-pressure steam inlet of the peak-shaving main steam ejector, a seventh shutoff valve is arranged on the low-pressure steam input pipeline of the peak-shaving main steam ejector, a medium-pressure steam output pipeline of the peak-shaving main steam ejector is arranged on the reheating cold section pipeline between the third shutoff valve and the steam inlet of the peak-shaving main steam ejector of the steam boiler, the other end of the medium-pressure steam output pipeline of the peak-adjusting main steam ejector is communicated with a medium-pressure steam output port of the peak-adjusting main steam ejector, and an eighth shut-off valve is arranged on the medium-pressure steam output pipeline of the peak-adjusting main steam ejector.
A fourth shutoff valve is arranged on the steam exhaust pipeline of the intermediate pressure cylinder, a peak-regulating hot section ejector low-pressure steam input pipe is arranged on the steam exhaust pipeline of the intermediate pressure cylinder between the fourth shutoff valve and the steam exhaust port of the intermediate pressure cylinder, the other end of the peak-regulating hot section ejector low-pressure steam input pipe is connected with the low-pressure steam input port of the peak-regulating hot section ejector, a tenth shutoff valve is arranged on the peak-regulating hot section ejector low-pressure steam input pipe, a peak-regulating hot section heat exchanger output pipeline is connected with the high-pressure steam input port of the peak-regulating hot section ejector, the other end of the peak-regulating hot section heat exchanger output pipeline is connected with a heat exchange steam output port of the peak-regulating hot section heat exchanger, a peak-regulating hot section heat exchanger steam input port pipeline is connected with the peak-regulating hot section heat exchanger, and the other end of the peak-regulating hot section heat exchanger steam input port pipeline is connected with a reheating hot section pipeline, the peak-shaving hot-section ejector medium-pressure steam output pipeline is connected to a medium-pressure steam output port of the peak-shaving hot-section ejector, the other end of the peak-shaving hot-section ejector medium-pressure steam output pipeline is communicated with a steam inlet of the low-pressure cylinder, and the peak-shaving hot-section ejector medium-pressure steam output pipeline is provided with a ninth shut-off valve.
An adjusting method of an on-grid electricity load adjusting system of a heating season cogeneration unit is characterized by comprising the following steps: opening the first shut-off valve, the second shut-off valve, the seventh shut-off valve and the eighth shut-off valve, guiding a part of main steam in the main steam pipeline to the peak shaving main steam heat exchanger, and reducing the steam inlet amount of a high-pressure cylinder of the unit so as to reduce the generated energy of the unit; the introduced main steam enters the peak-shaving main steam ejector through a steam output pipeline of the peak-shaving main steam heat exchanger after heat exchange of the peak-shaving main steam heat exchanger and is used as a high-pressure steam source of the peak-shaving main steam ejector, exhaust steam of a steam turbine on a reheating cold section pipeline enters a low-pressure inlet of the peak-shaving main steam ejector through a low-pressure steam input pipeline of the peak-shaving main steam ejector and is used as a low-pressure steam source of the peak-shaving main steam ejector, and injected medium-pressure steam enters a reheater steam inlet of a steam boiler through a medium-pressure steam output pipeline of the peak-shaving main steam ejector, so that safe and stable operation of the boiler is guaranteed; and opening a sixth shutoff valve, a fifth shutoff valve, a ninth shutoff valve and a tenth shutoff valve, wherein part of reheated hot section steam on the reheated cold section pipeline enters the peak-shaving hot section heat exchanger through a steam inlet pipeline of the peak-shaving hot section heat exchanger, the steam after heat exchange enters a high-pressure steam outlet of the peak-shaving hot section ejector through an output pipeline of the peak-shaving hot section heat exchanger, part of steam in a steam exhaust port of the intermediate pressure cylinder enters a low-pressure steam outlet of the peak-shaving hot section ejector through a low-pressure steam input pipe of the peak-shaving hot section ejector, and the injected intermediate-pressure steam enters the low-pressure cylinder through a medium-pressure steam output pipeline of the peak-shaving hot section ejector, so that the safe and stable operation of the low-pressure cylinder of the unit is ensured.
The invention has the advantages that on the premise of ensuring the safe and stable operation of the unit, the on-line electricity load adjusting capacity of the coal-fired unit is improved, so that the adjusting capacity of a power grid is improved, the consumption of new energy sources such as wind power, photoelectricity and the like is promoted, the utilization rate of the new energy sources is improved, the pollutant emission is reduced, and the atmospheric quality is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
an on-line electric load adjusting system of a heating season cogeneration unit comprises a steam boiler 1, a high-pressure cylinder 2, an intermediate-pressure cylinder 3 and a low-pressure cylinder 4, wherein an outlet of a superheater of the steam boiler 1 is communicated with a main steam inlet of the high-pressure cylinder 2 through a main steam pipeline 5, a steam outlet of the high-pressure cylinder 2 is communicated with a steam inlet of a reheater of the steam boiler 1 through a reheated cold section pipeline 6, a steam outlet of the reheater of the steam boiler 1 is communicated with a steam inlet of the intermediate-pressure cylinder 3 through a reheated hot section pipeline 7, a steam outlet of the intermediate-pressure cylinder 3 is communicated with a steam inlet of the low-pressure cylinder 4 through an intermediate-pressure cylinder steam outlet pipeline 8, a steam input pipeline 9 of a peak-shaving main steam heat exchanger is connected to the main steam pipeline 5, the other end of the steam input pipeline 9 of the peak-shaving main steam heat exchanger is connected with a heat exchange steam, a steam output pipeline 11 of the peak shaving main steam heat exchanger is connected on a heat exchange steam output port of the peak shaving main steam heat exchanger 10, the other end of the steam output pipeline 11 of the peak shaving main steam heat exchanger is connected with a high-pressure steam inlet of a peak shaving main steam ejector 12, a first shutoff valve 13 is arranged on a steam input pipeline 9 of the peak shaving main steam heat exchanger, a second shutoff valve 14 is arranged on the steam output pipeline 11 of the peak shaving main steam heat exchanger, a third shutoff valve 15 is arranged on a reheating cold section pipeline 6, a low-pressure steam input pipeline 16 of the peak shaving main steam ejector is arranged on the reheating cold section pipeline 6 between the third shutoff valve 15 and a steam outlet of the high-pressure cylinder 2, the other end of the low-pressure steam input pipeline 16 of the peak shaving main steam ejector is connected with a low-pressure steam inlet of the peak shaving main steam ejector 12, a seventh shutoff valve 27 is arranged on the low-pressure steam input pipeline 16 of the peak shaving main steam ejector, a peak-shaving main steam ejector medium-pressure steam output pipeline 17 is arranged on the reheating cold section pipeline 6 between the third shutoff valve 15 and the reheater steam inlet of the steam boiler 1, the other end of the peak-shaving main steam ejector medium-pressure steam output pipeline 17 is communicated with a peak-shaving main steam ejector medium-pressure steam output port of the peak-shaving main steam ejector 12, and an eighth shutoff valve 28 is arranged on the peak-shaving main steam ejector medium-pressure steam output pipeline 17.
A fourth shutoff valve 23 is arranged on the middle pressure cylinder steam exhaust pipeline 8, a peak regulation thermal section ejector low-pressure steam input pipe 22 is arranged on the middle pressure cylinder steam exhaust pipeline 8 between the fourth shutoff valve 23 and the steam exhaust port of the middle pressure cylinder 3, the other end of the peak regulation thermal section ejector low-pressure steam input pipe 22 is connected with the low-pressure steam input port of the peak regulation thermal section ejector 21, a tenth shutoff valve 30 is arranged on the peak regulation thermal section ejector low-pressure steam input pipe 22, a peak regulation thermal section heat exchanger output pipeline 20 is connected with the high-pressure steam input port of the peak regulation thermal section ejector 21, the other end of the peak regulation thermal section heat exchanger output pipeline 20 is connected with the heat exchange steam output port of the peak regulation thermal section heat exchanger 19, a peak regulation thermal section heat exchanger steam pipeline 18 is connected with the heat exchange steam input port of the peak regulation thermal section heat exchanger 19, the other end of the peak regulation thermal section heat exchanger steam input port 18 is connected with the reheating thermal section pipeline 7, a fifth shutoff valve 25 is arranged on the output pipeline 20 of the peak-shaving hot-section heat exchanger, a sixth shutoff valve 26 is arranged on the steam inlet pipeline 18 of the peak-shaving hot-section heat exchanger, a medium-pressure steam output pipeline 24 of the peak-shaving hot-section ejector is connected to the medium-pressure steam output port of the peak-shaving hot-section ejector 21, the other end of the medium-pressure steam output pipeline 24 of the peak-shaving hot-section ejector is communicated with a steam inlet of the low-pressure cylinder 4, and a ninth shutoff valve 29 is arranged on the medium-pressure steam output pipeline 24 of the peak-shaving hot-section ejector.
An adjusting method of an on-grid electricity load adjusting system of a heating season cogeneration unit is characterized by comprising the following steps:
opening the first shut-off valve 13, the second shut-off valve 14, the seventh shut-off valve 27 and the eighth shut-off valve 28, guiding a part of main steam in the main steam pipeline 5 to the peak shaving main steam heat exchanger 10, and reducing the steam inlet amount of a high-pressure cylinder of the unit so as to reduce the power generation amount of the unit; the introduced main steam enters the peak-shaving main steam ejector 12 through the steam output pipeline 11 of the peak-shaving main steam heat exchanger after heat exchange of the peak-shaving main steam heat exchanger 10 and serves as a high-pressure steam source of the peak-shaving main steam ejector 12, exhaust steam of a steam turbine on the reheating cold section pipeline 6 enters a low-pressure inlet of the peak-shaving main steam ejector 12 through the low-pressure steam input pipeline 16 of the peak-shaving main steam ejector and serves as a low-pressure steam source of the peak-shaving main steam ejector 12, and injected medium-pressure steam enters a reheater steam inlet of the steam boiler 1 through the medium-pressure steam output pipeline 17 of the peak-shaving main steam ejector, so that safe and stable operation of the boiler is guaranteed;
and opening a sixth shut-off valve 26, a fifth shut-off valve 25, a ninth shut-off valve 29 and a tenth shut-off valve 30, allowing part of reheated section steam on the reheated cold section pipeline 6 to enter the peak regulation hot section heat exchanger 19 through the peak regulation hot section heat exchanger steam inlet pipeline 18, allowing the heat-exchanged steam to enter a high-pressure steam outlet of the peak regulation hot section ejector 21 through the peak regulation hot section heat exchanger output pipeline 20, allowing part of steam in a steam exhaust port of the intermediate pressure cylinder 3 to enter a low-pressure steam outlet of the peak regulation hot section ejector 21 through the peak regulation hot section ejector low-pressure steam input pipe 22, and allowing the injected intermediate-pressure steam to enter the low pressure cylinder 4 through the peak regulation hot section ejector medium-pressure steam output pipeline 24, so as to ensure safe and stable operation of the low pressure cylinder of the unit.
On the premise of ensuring the safe operation of the unit, the invention can improve the adjusting range of the unit to 15-90% and the adjusting capacity to 15%; the system improves the adjusting capability of the generator set, thereby improving the adjusting capability of the power grid and promoting the consumption of new energy such as wind power, photoelectricity and the like; the system is particularly suitable for the cogeneration unit, because the existing cogeneration unit is designed to fix power by heat, the adjustable range of the cogeneration unit in the heating season is very small, about 60-90 percent, and by the system, on the premise of ensuring heat supply, the adjustable range of the cogeneration unit in the heating season is 15-90 percent, and the adjusting capacity is improved by 15 percent; in the heating season, the peak period of wind power generation is also realized, the adjusting capacity of the thermoelectric unit is improved, and the utilization rate of wind power is improved in the heating season, so that the positive promoting effect is realized.
Claims (2)
1. An on-grid electricity load adjusting system of a heating season cogeneration unit comprises a steam boiler (1), a high-pressure cylinder (2), an intermediate pressure cylinder (3) and a low-pressure cylinder (4), wherein a superheater outlet of the steam boiler (1) is communicated with a main steam inlet of the high-pressure cylinder (2) through a main steam pipeline (5), a steam exhaust port of the high-pressure cylinder (2) is communicated with a reheater steam inlet of the steam boiler (1) through a reheated cold section pipeline (6), a steam outlet of the steam boiler (1) is communicated with a steam inlet of the intermediate pressure cylinder (3) through a reheated hot section pipeline (7), a steam exhaust port of the intermediate pressure cylinder (3) is communicated with a steam inlet of the low-pressure cylinder (4) through an intermediate pressure cylinder steam exhaust pipeline (8), and is characterized in that a peak-adjusting main steam heat exchanger steam input pipeline (9) is connected to the main steam pipeline (5), the other end of a steam input pipeline (9) of the peak-shaving main steam heat exchanger is connected with a heat exchange steam inlet of the peak-shaving main steam heat exchanger (10), a steam output pipeline (11) of the peak-shaving main steam heat exchanger is connected to a heat exchange steam output port of the peak-shaving main steam heat exchanger (10), the other end of the steam output pipeline (11) of the peak-shaving main steam heat exchanger is connected with a high-pressure steam inlet of a peak-shaving main steam ejector (12), a first shut-off valve (13) is arranged on the steam input pipeline (9) of the peak-shaving main steam heat exchanger, a second shut-off valve (14) is arranged on the steam output pipeline (11) of the peak-shaving main steam heat exchanger, a third shut-off valve (15) is arranged on a reheating cold section pipeline (6), a low-pressure steam input pipeline (16) of the peak-shaving main steam ejector is arranged on the reheating cold section pipeline (6) between the third shut-off valve (15) and a steam exhaust port of the, the other end of the low-pressure steam input pipeline (16) of the peak-shaving main steam ejector is connected with a low-pressure steam inlet of the peak-shaving main steam ejector (12), a seventh shut-off valve (27) is arranged on the low-pressure steam input pipeline (16) of the peak-shaving main steam ejector, a peak-shaving main steam ejector medium-pressure steam output pipeline (17) is arranged on a reheating cold section pipeline (6) between the third shut-off valve (15) and a reheater steam inlet of the steam boiler (1), the other end of the peak-shaving main steam ejector medium-pressure steam output pipeline (17) is communicated with a peak-shaving main steam ejector medium-pressure steam output port of the peak-shaving main steam ejector (12), and an eighth shut-off valve (28) is arranged on the peak-shaving main steam ejector medium-pressure steam output pipeline (17).
2. The grid-connected electricity load adjusting system of the heating season cogeneration unit according to claim 1, characterized in that a fourth shutoff valve (23) is arranged on the middle pressure cylinder steam exhaust pipeline (8), a peak-shaving hot section ejector low-pressure steam input pipe (22) is arranged on the middle pressure cylinder steam exhaust pipeline (8) between the fourth shutoff valve (23) and the steam exhaust port of the middle pressure cylinder (3), the other end of the peak-shaving hot section ejector low-pressure steam input pipe (22) is connected with the low-pressure steam input port of the peak-shaving hot section ejector (21), a tenth shutoff valve (30) is arranged on the peak-shaving hot section ejector low-pressure steam input pipe (22), a peak-shaving hot section heat exchanger output pipeline (20) is connected to the high-pressure steam input port of the peak-shaving hot section ejector (21), the other end of the peak-shaving hot section heat exchanger output pipeline (20) is connected with the heat exchange steam output port of the peak-shaving hot section heat exchanger (19), a steam inlet pipeline (18) of the peak-shaving hot-section heat exchanger is connected to a heat exchange steam inlet of the peak-shaving hot-section heat exchanger (19), the other end of the steam inlet pipeline (18) of the peak-shaving hot-section heat exchanger is connected with a reheating hot-section pipeline (7), a fifth shutoff valve (25) is arranged on an output pipeline (20) of the peak-shaving hot-section heat exchanger, a sixth shutoff valve (26) is arranged on the steam inlet pipeline (18) of the peak-shaving hot-section heat exchanger, a medium-pressure steam output pipeline (24) of the peak-shaving hot-section ejector is connected to a medium-pressure steam outlet of the peak-shaving hot-section ejector (21), the other end of the medium-pressure steam output pipeline (24) of the peak-shaving hot-section ejector is communicated with a steam inlet of the low-pressure cylinder (4), and a ninth shutoff valve (29) is arranged on the medium-pressure steam output pipeline (24) of the peak-.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921883170.3U CN211174242U (en) | 2019-11-04 | 2019-11-04 | Heating season cogeneration unit on-line electricity load adjusting system |
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| CN201921883170.3U CN211174242U (en) | 2019-11-04 | 2019-11-04 | Heating season cogeneration unit on-line electricity load adjusting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110700909A (en) * | 2019-11-04 | 2020-01-17 | 中国能源建设集团山西省电力勘测设计院有限公司 | Heating season cogeneration unit on-line electricity load adjusting system and adjusting method |
| CN114321880A (en) * | 2022-01-11 | 2022-04-12 | 上海敬琛电力科技中心 | Safe operation method of boiler reheater and denitration system during deep peak shaving of thermal power generating unit |
-
2019
- 2019-11-04 CN CN201921883170.3U patent/CN211174242U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110700909A (en) * | 2019-11-04 | 2020-01-17 | 中国能源建设集团山西省电力勘测设计院有限公司 | Heating season cogeneration unit on-line electricity load adjusting system and adjusting method |
| CN110700909B (en) * | 2019-11-04 | 2023-11-24 | 中国能源建设集团山西省电力勘测设计院有限公司 | Internet surfing electric load adjusting system and adjusting method for heating Ji Re cogeneration unit |
| CN114321880A (en) * | 2022-01-11 | 2022-04-12 | 上海敬琛电力科技中心 | Safe operation method of boiler reheater and denitration system during deep peak shaving of thermal power generating unit |
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