CN107178398B - Thermoelectric decoupling system for improving energy utilization quality of thermal power plant - Google Patents
Thermoelectric decoupling system for improving energy utilization quality of thermal power plant Download PDFInfo
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- CN107178398B CN107178398B CN201710488914.0A CN201710488914A CN107178398B CN 107178398 B CN107178398 B CN 107178398B CN 201710488914 A CN201710488914 A CN 201710488914A CN 107178398 B CN107178398 B CN 107178398B
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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
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/44—Use of steam for feed-water heating and another purpose
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Abstract
The invention discloses a thermoelectric decoupling system for improving the energy utilization quality of a thermoelectric power plant, which comprises a boiler, a high-pressure cylinder, a primary bypass regulating valve, a first additional high-pressure heater, an intermediate-pressure cylinder, a second additional high-pressure heater, a secondary bypass regulating valve, a heat supply network circulating water system, a low-pressure cylinder and a water supply regulating valve.
Description
Technical Field
The invention relates to a thermoelectric decoupling system, in particular to a thermoelectric decoupling system for improving the energy utilization quality of a thermal power plant.
Background
Coal-fired thermal power generation is an important component of energy systems in China at present and in the future for a long time. However, with the increasing and slowing of the electricity demand of the whole society and the large-scale development of renewable energy sources, the number of utilization hours of thermal power will be reduced year by year, so that the operation flexibility of the thermal power generating unit is improved, and the large-scale participation in the deep peak regulation of the power grid will be great. In the 'three north' area of China, the specific gravity of a cogeneration unit is large, and the problems of shortage of peak-adjustable power supplies such as water, electricity and a straight condensing unit and the like and difficult peak adjustment become the most prominent problems in the operation of a power grid. The traditional coal-fired thermoelectric generator set runs in a mode of 'fixing power by heat', the peak regulation capacity is only about 10%, and the peak regulation capacity is insufficient, so that the consumption of new energy resources such as wind power and the like is influenced. Due to the situation, the peak regulation of the power grid is difficult, the off-peak power balance of the power grid is difficult, and the safe operation risk of the power grid is increased; the power grid has serious insufficient capability of absorbing new energy such as wind power and the like, and the problem of wind abandonment is very prominent, so that the energy conservation and emission reduction of regions and the transformation and upgrading of energy structures are not facilitated; the contradiction between the peak regulation of the power grid and the heat supply of the thermal power generating unit is prominent, the heating safety of residents in winter is influenced, and the risk of causing the problems of residents exists, so that the decoupling of thermal power production and electric power production by the thermal power generating unit is imperative, a system is urgently needed to be designed, the decoupling operation of the electric power production and the thermal power production can be realized, and the peak regulation capability of the thermal power generating unit can be obviously improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a thermoelectric decoupling system for improving the energy utilization quality of a thermal power plant, the system can realize the decoupling operation of power production and thermal production, and the heat supply peak regulation capacity of a thermoelectric unit is obviously improved.
In order to achieve the purpose, the thermoelectric decoupling system for improving the energy utilization quality of the thermal power plant comprises a boiler, a high-pressure cylinder, a primary bypass regulating valve, a first additional high-pressure heater, an intermediate-pressure cylinder, a second additional high-pressure heater, a secondary bypass regulating valve, a heat supply network circulating water system, a low-pressure cylinder and a feed water regulating valve;
the main steam outlet of the boiler is communicated with the inlet of the high-pressure cylinder and the inlet of the primary bypass regulating valve, the outlet of the primary bypass regulating valve is communicated with the heat-releasing side inlet of the first additional high-pressure heater, the outlet of the high-pressure cylinder and the heat-releasing side outlet of the first additional high-pressure heater are communicated with the reheating side inlet of the boiler through pipelines and pipes, the reheating side outlet of the boiler is communicated with the inlet of the intermediate pressure cylinder and the heat-releasing side inlet of the second additional high-pressure heater, the heat-releasing side outlet of the second additional high-pressure heater is communicated with the heat-supply network circulating water system through a secondary bypass regulating valve, the outlet of the intermediate pressure cylinder is communicated with the heat-supply network circulating water system and the inlet of the low-pressure cylinder, the outlet of the low-pressure cylinder is communicated with the inlet of the feed water regulating valve, the heat-absorbing side inlet of the first additional high-pressure heater and the heat-absorbing side outlet of the second additional high-pressure heater and the outlet of the feed water regulating valve are communicated with the inlet of the boiler through pipelines and pipes.
The heat supply network circulating water system comprises a heat supply network circulating water input pipeline, a heat supply network circulating water output pipeline, a circulating water regulating valve, a circulating water inlet regulating valve, an adjustable heat supply network heater and a heat supply network heater; the heat supply network circulating water input pipeline is communicated with the inlet of the circulating water regulating valve and the inlet of the circulating water inlet regulating valve, the outlet of the circulating water regulating valve is communicated with the heat supply network circulating water output pipeline through the heat absorption side of the adjustable heat supply network heater, and the outlet of the circulating water inlet regulating valve is communicated with the heat supply network circulating water output pipeline through the heat absorption side of the heat supply network heater;
the outlet of the intermediate pressure cylinder is communicated with the heat release side of the heat supply network heater, and the secondary bypass regulating valve is communicated with the heat release side of the adjustable heat supply network heater.
The outlet of the low pressure cylinder is divided into two paths after passing through the low pressure heater, the deaerator and the high pressure heater, wherein one path is communicated with the inlet of the feed water regulating valve, and the other path is communicated with the heat absorption side inlet of the first additional high pressure heater and the heat absorption side inlet of the second additional high pressure heater.
The outlet of the intermediate pressure cylinder is divided into two paths, wherein one path is communicated with the heat release side of the heat supply network heater, and the other path is communicated with the inlet of the low pressure cylinder through a first regulating valve.
The outlet of the reheating side of the boiler is communicated with the inlet of the second regulating valve and the inlet of the intermediate pressure cylinder, and the outlet of the second regulating valve is communicated with the heat-releasing side inlet of the first additional high-pressure heater.
The invention has the following beneficial effects:
when the thermoelectric decoupling system for improving the energy utilization quality of the thermal power plant is in specific operation, when electric power is required to be reduced by power grid scheduling, the primary bypass regulating valve and the secondary bypass regulating valve are opened, main steam output by the boiler enters the second additional high-pressure heater and the high-pressure cylinder, final feed water of the boiler is heated by steam entering the second additional high-pressure heater, reheated steam output by the reheating side of the boiler enters the intermediate pressure cylinder and the first additional high-pressure heater, the final feed water of the boiler is heated by the reheated steam entering the first additional high-pressure heater, and steam output by the heat release side of the second additional high-pressure heater enters the heat network circulating water system through the secondary bypass regulating valve to heat network circulating water, so that the quality loss caused by direct temperature and pressure reduction of working media is avoided; when the electric power is required to be increased by power grid dispatching, the opening degrees of the first-stage bypass regulating valve and the second-stage bypass regulating valve are gradually reduced, the steam inlet amount of the high-pressure cylinder and the medium-pressure cylinder is increased, the electric power of the system is improved, and the steam amount between the medium-pressure cylinder and the heat supply network circulating water system is increased, so that the heat supply peak regulation capacity of the thermoelectric unit is obviously improved, and the decoupling operation of electric power production and thermal power production is realized.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is adjustable heating network heater, 2 is heating network heater, 3 is circulating water governing valve, 4 is circulating water inlet governing valve, 51 is first additional high pressure heater, 52 is second additional high pressure heater, 6 is feed water governing valve, 7 is first order bypass governing valve, 8 is second order bypass governing valve, 9 is the second governing valve, 10 is first governing valve, 11 is low pressure heater, 12 is oxygen-eliminating device, 13 is high pressure heater, 14 is the boiler.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the thermoelectric decoupling system for improving the energy utilization quality of the thermal power plant according to the present invention includes a boiler 14, a high-pressure cylinder HP, a primary bypass regulating valve 7, a first additional high-pressure heater 51, an intermediate-pressure cylinder IP, a second additional high-pressure heater 52, a secondary bypass regulating valve 8, a heat supply network circulating water system, a low-pressure cylinder LP, and a feedwater regulating valve 6; the main steam outlet of the boiler 14 is communicated with the inlet of the high-pressure cylinder HP and the inlet of the primary bypass regulating valve 7, the outlet of the primary bypass regulating valve 7 is communicated with the heat releasing side inlet of the first additional high-pressure heater 51, the outlet of the high-pressure cylinder HP and the heat releasing side outlet of the first additional high-pressure heater 51 are communicated with the reheating side inlet of the boiler 14 through pipelines and pipes, the reheating side outlet of the boiler 14 is communicated with the inlet of the intermediate pressure cylinder IP and the heat releasing side inlet of the second additional high-pressure heater 52, the heat releasing side outlet of the second additional high-pressure heater 52 is communicated with the heat supply network circulating water system through the secondary bypass regulating valve 8, the outlet of the intermediate pressure cylinder IP is communicated with the inlets of the heat supply network circulating water system and the low-pressure cylinder LP, the outlet of the low-pressure cylinder LP is communicated with the inlet of the feed water regulating valve 6, the heat absorbing side inlet of the first additional high-pressure heater 51 and the heat absorbing side inlet of the second additional high-pressure heater 52, and the heat absorbing side outlet of the feed water regulating valve 6 are communicated with the inlets of the boiler 14 through pipelines and pipes.
The heat supply network circulating water system comprises a heat supply network circulating water input pipeline, a heat supply network circulating water output pipeline, a circulating water regulating valve 3, a circulating water inlet regulating valve 4, an adjustable heat supply network heater 1 and a heat supply network heater 2; the heat supply network circulating water input pipeline is communicated with the inlet of the circulating water regulating valve 3 and the inlet of the circulating water inlet regulating valve 4, the outlet of the circulating water regulating valve 3 is communicated with the heat supply network circulating water output pipeline through the heat absorption side of the adjustable heat supply network heater 1, and the outlet of the circulating water inlet regulating valve 4 is communicated with the heat supply network circulating water output pipeline through the heat absorption side of the heat supply network heater 2; the outlet of the intermediate pressure cylinder IP is communicated with the heat release side of the heat supply network heater 2, and the secondary bypass regulating valve 8 is communicated with the heat release side of the adjustable heat supply network heater 1.
The outlet of the low pressure cylinder LP is divided into two paths after passing through the low pressure heater 11, the deaerator 12 and the high pressure heater 13, wherein one path is communicated with the inlet of the feed water regulating valve 6, and the other path is communicated with the heat absorption side inlet of the first additional high pressure heater 51 and the heat absorption side inlet of the second additional high pressure heater 52; the outlet of the intermediate pressure cylinder IP is divided into two paths, wherein one path is communicated with the heat release side of the heat supply network heater 2, and the other path is communicated with the inlet of the low pressure cylinder LP through a first regulating valve 10; the outlet of the boiler 14 on the reheat side communicates with the inlet of the second regulator valve 9 and the inlet of the intermediate pressure cylinder IP, and the outlet of the second regulator valve 9 communicates with the inlet of the first additional high pressure heater on the heat release side.
The main steam output by the boiler 14 is divided into two paths, wherein one path enters the second additional high-pressure heater 52 through the first-stage bypass regulating valve 7, the other path enters the high-pressure cylinder HP, so that the final water supply of the boiler 14 is heated through the steam entering the second additional high-pressure heater 52, the part of steam enters the reheating cold side of the boiler 14 after heat exchange, the reheating steam output by the reheating side of the boiler 14 is divided into two paths, one path enters the intermediate pressure cylinder IP, the other path enters the first additional high-pressure heater 51, the final water supply of the boiler 14 is heated through the reheating steam entering the first additional high-pressure heater 51, the steam output by the heat releasing side of the first additional high-pressure heater 51 enters the heating network circulating water in the adjustable heating network heater 1 through the second-stage bypass regulating valve 8, the quality loss caused by the direct temperature and pressure reducing process of the working medium is avoided, and the decoupling operation of power production and thermal production is further realized.
The invention breaks through the existing 'electricity fixed by heat' existing mode by matching and adjusting the primary bypass adjusting valve 7 and the secondary bypass adjusting valve 8. When the power grid dispatching system works, when the electric power is required to be reduced by power grid dispatching, the primary bypass regulating valve 7 is opened to realize the diversion of main steam, the main steam which is shunted is used for heating final feed water entering the boiler 14, and the cooled main steam enters a reheating pipeline of the boiler 14 for heat absorption; meanwhile, the reheated steam output by the boiler 14 is divided into two paths, wherein one path enters the intermediate pressure cylinder IP, and the other path enters the heating network circulating water in the adjustable heating network heater 1 after passing through the heat release side of the first additional high-pressure heater 51, so that the steam flow entering the heating network heater 2 through the steam exhaust of the intermediate pressure cylinder IP is reduced, the total heat supply load is kept unchanged, the steam inlet flow of the high pressure cylinder HP, the intermediate pressure cylinder IP and the low pressure cylinder LP is reduced, the output electric power of the unit is reduced, the heat supply load is kept unchanged, and the electric power is adjusted downwards; when the electric power required by the power grid dispatching is increased, the opening degrees of the first-stage bypass regulating valve 7 and the second-stage bypass regulating valve 8 are gradually reduced, so that the amount of steam entering the high-pressure cylinder HP and the heat supply network heater 2 can be increased, the power of the heat supply network heater 2 is increased, and meanwhile, the electric power of the system is increased. It should be noted that the steam is extracted by adjusting the first-stage bypass adjusting valve 7 and the second-stage bypass adjusting valve 8, so that the axial driving force of the high-pressure cylinder HP and the intermediate-pressure cylinder IP is kept unchanged under the condition that the steam inlet flow proportion of the intermediate-pressure cylinder IP and the high-pressure cylinder HP is unchanged; steam is extracted through the primary bypass regulating valve 7 and the secondary bypass regulating valve 8 to heat final feed water entering the boiler 14, so that the temperature of flue gas at the inlet of the SCR denitration device is increased, the denitration efficiency is improved, and the normal operation of the environment-friendly equipment in a deep peak regulation state is realized; meanwhile, steam is introduced into a heat supply network circulating water system by opening the primary bypass regulating valve 7 and the secondary bypass regulating valve 8, and compared with a reheater which is directly subjected to temperature reduction and pressure reduction, the utilization efficiency of working media is effectively improved.
Claims (3)
1. A thermoelectric decoupling system for improving the energy utilization quality of a thermal power plant is characterized by comprising a boiler (14), a high-pressure cylinder (HP), a primary bypass regulating valve (7), a first additional high-pressure heater (51), a medium-pressure cylinder (IP), a second additional high-pressure heater (52), a secondary bypass regulating valve (8), a heat supply network circulating water system, a low-pressure cylinder (LP) and a feed water regulating valve (6);
the main steam outlet of the boiler (14) is communicated with the inlet of a high-pressure cylinder (HP) and the inlet of a primary bypass regulating valve (7), the outlet of the primary bypass regulating valve (7) is communicated with the heat-releasing side inlet of a first additional high-pressure heater (51), the outlet of the high-pressure cylinder (HP) and the heat-releasing side outlet of the first additional high-pressure heater (51) are communicated with the reheating side inlet of the boiler (14) through pipelines and pipes, the reheating side outlet of the boiler (14) is communicated with the inlet of an intermediate pressure cylinder (IP) and the heat-releasing side inlet of a second additional high-pressure heater (52), the heat-releasing side outlet of the second additional high-pressure heater (52) is communicated with a heat network circulating water system through a two-stage bypass regulating valve (8), the outlet of the intermediate pressure cylinder (IP) is communicated with the heat network circulating water system and the inlet of a low-pressure cylinder (LP), the outlet of the low-pressure cylinder (LP) is communicated with the inlet of a feed water regulating valve (6), the heat-absorbing side inlet of the first additional high-pressure heater (51) and the heat-absorbing side inlet of the second additional high-pressure heater (52), and the heat-absorbing side outlet of the first additional high-pressure heater (51) are communicated with the feed water inlet of the feed water supply pipeline and the heat-absorbing side outlet of the feed water supply pipeline (14);
the heat supply network circulating water system comprises a heat supply network circulating water input pipeline, a heat supply network circulating water output pipeline, a circulating water regulating valve (3), a circulating water inlet regulating valve (4), an adjustable heat supply network heater (1) and a heat supply network heater (2); the heat supply network circulating water input pipeline is communicated with an inlet of a circulating water regulating valve (3) and an inlet of a circulating water inlet regulating valve (4), an outlet of the circulating water regulating valve (3) is communicated with the heat supply network circulating water output pipeline through a heat absorption side of an adjustable heat supply network heater (1), and an outlet of the circulating water inlet regulating valve (4) is communicated with the heat supply network circulating water output pipeline through a heat absorption side of a heat supply network heater (2);
the outlet of the intermediate pressure cylinder (IP) is communicated with the heat release side of the heat supply network heater (2), and the secondary bypass regulating valve (8) is communicated with the heat release side of the adjustable heat supply network heater (1);
the outlet of the low pressure cylinder (LP) is divided into two paths after passing through a low pressure heater (11), a deaerator (12) and a high pressure heater (13), wherein one path is communicated with the inlet of the feed water regulating valve (6), and the other path is communicated with the heat absorption side inlet of the first additional high pressure heater (51) and the heat absorption side inlet of the second additional high pressure heater (52).
2. The system according to claim 1, wherein the outlet of the intermediate pressure cylinder (IP) is divided into two paths, one path is connected to the heat releasing side of the heat network heater (2), and the other path is connected to the inlet of the low pressure cylinder (LP) via the first regulating valve (10).
3. The system according to claim 1, wherein the outlet of the boiler (14) on the reheat side is in communication with the inlet of the second regulator valve (9) and the inlet of the intermediate pressure cylinder (IP), and the outlet of the second regulator valve (9) is in communication with the inlet of the first additional high pressure heater (51) on the heat release side.
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| CN109931117B (en) * | 2017-12-19 | 2024-02-20 | 赫普能源环境科技股份有限公司 | System combining unit bypass with external peak regulation and frequency modulation equipment |
| CN108301882B (en) * | 2018-03-12 | 2024-03-05 | 西安热工研究院有限公司 | Three-stage series-parallel bypass system of generator set and adjusting method thereof |
| CN108425405B (en) * | 2018-04-02 | 2024-02-13 | 淮阴工学院 | Networked water source monitoring and graded water supply device and monitoring system thereof |
| CN109854313B (en) * | 2019-03-11 | 2020-03-24 | 西安交通大学 | Flexible coal-fired power generation system and operation method |
| CN111780198B (en) * | 2020-07-15 | 2022-02-11 | 西安热工研究院有限公司 | Thermoelectric load wide-range adjusting system for water supply and temperature reduction heat supply |
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| US8436489B2 (en) * | 2009-06-29 | 2013-05-07 | Lightsail Energy, Inc. | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange |
| US9617874B2 (en) * | 2013-06-17 | 2017-04-11 | General Electric Technology Gmbh | Steam power plant turbine and control method for operating at low load |
| CN104421925A (en) * | 2013-09-04 | 2015-03-18 | 济南海普电力节能科技有限公司 | Gradient utilization method and device of boiler flue gas waste heat |
| CN105805806B (en) * | 2016-04-19 | 2016-11-23 | 山西爱晟特环保科技有限公司 | A kind of hot pressing unit heating system based on large-scale air cooling unit and control method thereof |
| CN106090880B (en) * | 2016-07-21 | 2018-06-26 | 京能（锡林郭勒）发电有限公司 | A kind of machine stove set heat circulation afterheat recycling system |
| CN106194296A (en) * | 2016-09-05 | 2016-12-07 | 华能国际电力股份有限公司 | Thermoelectric decoupling heating system for extracting steam from power station boiler |
| CN206144613U (en) * | 2016-09-05 | 2017-05-03 | 华能国际电力股份有限公司 | Thermoelectric decoupling heating system for extracting steam from power station boiler |
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