CN112050190A - Thermoelectric peak regulation method for coal-fired unit - Google Patents
Thermoelectric peak regulation method for coal-fired unit Download PDFInfo
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- CN112050190A CN112050190A CN202010943731.5A CN202010943731A CN112050190A CN 112050190 A CN112050190 A CN 112050190A CN 202010943731 A CN202010943731 A CN 202010943731A CN 112050190 A CN112050190 A CN 112050190A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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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
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Abstract
A thermoelectric peak regulation method for a coal-fired unit is based on a high-low side double-injection system, and the steam flow at the outlet of a boiler is determined according to the total thermoelectric load; according to the magnitude of thermal load and electric load, the opening degrees of a high-pressure bypass adjusting valve and a steam inlet adjusting valve of a high-pressure cylinder of a steam turbine are changed, superheated steam is shunted and respectively enters a high-side ejector and the high-pressure cylinder of the steam turbine, and steam at an outlet of the high-side ejector and exhaust steam of the high-pressure cylinder are combined and enter a reheater; regulating the steam flow entering the throat of the high-side ejector and the low-pressure cylinder by changing the opening of a steam inlet regulating valve of the low-pressure cylinder; the opening degree of the steam inlet regulating valve of the intermediate pressure cylinder and the opening degree of the low-pressure bypass regulating valve are adjusted, so that the reheated steam is shunted to enter the intermediate pressure cylinder and the low-pressure bypass ejector of the steam turbine, and the ratio of the steam inlet flow of the intermediate pressure cylinder to the steam inlet flow of the high pressure cylinder keeps near the design ratio; the steam at the outlet of the low-side ejector flows to a heat supply steam main pipe; the method realizes maximum thermal peak regulation and deep electrical peak regulation, and obviously improves the adaptive thermal peak regulation capability and the deep electrical peak regulation capability of the unit.
Description
Technical Field
The invention relates to the electric power and heat power supply technology in the field of energy power, in particular to a thermoelectric peak regulation method for a coal-fired unit.
Background
The heat supply is a civil guarantee project, and the heat and power cogeneration centralized heat supply of the coal-fired generator set is a main heating mode in cities and towns.
Under the background of rapid development of new energy and great increase of installed proportion, the contradiction between insufficient peak regulation capacity on the power supply side of the coal-fired unit and new energy consumption is continuously deepened, particularly in the heat supply period in winter, the problem of thermoelectric coupling is serious, and the peak regulation capacity is limited by electric loads; the phenomenon of electricity abandon during heat supply is serious, and the energy loss is huge.
In order to enhance the thermoelectric peak regulation capacity, a plurality of coal-fired power plants are developed with flexible reformation, mainly comprising: the operation practice shows that the peak shaving capacity of the heat supply operation modes is limited and the safety problem exists, for example, the low-pressure cylinder zero output causes the damage of the last-stage blade of the steam turbine and the flutter of the steam turbine under the small volume flow; the starting of high-low pressure bypass heat supply peak shaving has the problems of poor operation reliability of the temperature and pressure reducer, easy damage, failure and poor economical efficiency, in order to increase heat supply output, some thermal power plants implement an electric boiler and a heat storage system, although the heat supply of the electric boiler has strong thermoelectric decoupling capacity, the heat supply path from heat → electricity → heat has no technical statement, the investment is too high, the heat supply economical efficiency is too poor, the heat storage and heat supply are only 'peak shifting and valley filling', and the problems of high investment, large occupied area and poor adaptability to long-term low load peak shaving of a power grid also exist.
At present, the heat supply peak regulation capacity of a coal-fired unit basically stops in a low-pressure cylinder zero-output operation mode, the heat supply peak load requirement under extremely cold weather cannot be met, the heat supply output can be maximized only by starting high-low bypass peak regulation heat supply in a thermal power plant, the thermoelectricity can be completely and essentially decoupled, and the high-efficiency adaptive thermoelectricity peak regulation within the full heat supply working condition range is realized.
Disclosure of Invention
Based on the prior art, the invention provides a thermoelectric peak regulation method for a coal-fired unit, which has the following specific technical scheme:
a thermoelectric peak regulation method for a coal-fired unit is characterized by comprising the following steps: the thermoelectric peak regulation method of the coal-fired unit is based on a thermoelectric peak regulation method of a high-low side double-injection system, the high-low side double-injection system is composed of a high side injector and a communication pipeline and a regulating valve thereof, a reheater, a low side injector and a communication pipeline and a regulating valve thereof, thermoelectric complete essential decoupling, heat supply maximization and deep electric peak regulation are realized, and the specific method is as follows:
(1) determining the steam flow at the outlet of the boiler according to the total load of the heat and electricity; according to the magnitude of the thermal load and the electrical load, the opening degrees of a high-pressure bypass adjusting valve and a steam inlet adjusting valve of a high-pressure cylinder of the steam turbine are changed, so that superheated steam is shunted and enters a high-pressure bypass ejector and the high-pressure cylinder of the steam turbine respectively; the steam at the outlet of the high-side ejector and the exhaust steam of the high-pressure cylinder are combined and enter a reheater;
(2) regulating the steam flow entering the throat of the high-side ejector and the low-pressure cylinder by changing the opening of a steam inlet regulating valve of the low-pressure cylinder;
(3) the opening degree of the steam inlet regulating valve of the intermediate pressure cylinder and the opening degree of the low-pressure bypass regulating valve are adjusted, so that the reheated steam is shunted to enter the intermediate pressure cylinder and the low-pressure bypass ejector of the steam turbine, and the ratio of the steam inlet flow of the intermediate pressure cylinder to the steam inlet flow of the high pressure cylinder keeps near the design ratio; and the steam at the outlet of the low-side ejector flows to a heat supply steam main pipe.
In the above technical solution, a further technical feature is that: the steam pressure at the inlet of the high-side ejector can be supercritical pressure, namely, the steam pressure can be more than 22.12 MPa; the inlet of the high-side ejector is connected with a high-pressure bypass pipeline of the steam turbine, the throat part of the high-side ejector is connected with a steam exhaust pipeline of the intermediate pressure cylinder, and the outlet of the high-side ejector is connected with a steam inlet pipeline of the reheater; the inlet of the low side ejector is connected with the outlet steam pipeline of the reheater, the throat of the low side ejector is connected with the low pressure cylinder steam exhaust pipeline, and the outlet of the low side ejector is connected with the heat supply steam pipeline.
Compared with the prior art, the technical scheme of the invention has the following advantages.
(1) The heat and electricity of the coal-fired thermal power plant are completely and essentially decoupled, the flexible adjustment of the heat load and the electric load is realized, the maximum heat peak regulation and the deep electric peak regulation can be realized, and the adaptive heat peak regulation capability and the deep electric peak regulation capability of the unit are obviously improved.
(2) The high-side ejector can stably, safely and efficiently supply heat for a long time and ensure the safe operation of the steam turbine during adaptive electric peak regulation.
(3) The low side ejector can stably, safely and efficiently supply heat for a long time.
Drawings
FIG. 1 is a schematic diagram of the thermoelectric peak shaving method of the coal-fired unit of the present invention.
Detailed Description
The following further describes the embodiments of the present invention.
As shown in the attached drawing 1, the thermoelectric peak regulation method of the coal-fired unit provided by the invention is implemented based on a thermoelectric peak regulation method of high-low side double injection, and the specific method is as follows:
(1) the high-side ejector is arranged on a high-pressure bypass of the steam turbine, an inlet of the high-side ejector is communicated with a high-pressure bypass pipeline of the steam turbine, a throat part of the high-side ejector is communicated with a steam exhaust pipeline of a medium pressure cylinder, and an outlet of the high-side ejector is communicated with a steam inlet pipeline of a reheater.
(2) The low-pressure bypass of the steam turbine is provided with a low-bypass ejector, the inlet of the low-bypass ejector is communicated with a reheater outlet steam pipeline, the throat part of the low-bypass ejector is communicated with a low-pressure cylinder steam exhaust pipeline, and the outlet of the low-bypass ejector is communicated with a heat supply steam pipeline.
(3) Determining the steam flow at the outlet of the boiler according to the total load of the heat and electricity; according to the thermal load and the electrical load, the opening degrees of the high-pressure bypass adjusting valve 1 and the steam turbine steam inlet adjusting valve 2 are adjusted, so that superheated steam is shunted and enters a high-pressure bypass ejector and a steam turbine high-pressure cylinder respectively; and the steam at the outlet of the high-side ejector and the exhaust steam of the high-pressure cylinder are combined and enter a reheater.
(4) The steam flow entering the throat part of the high-side ejector and the low-pressure cylinder is adjusted by changing the opening of the steam inlet adjusting valve 3 of the low-pressure cylinder.
(5) The opening degree of an intermediate pressure cylinder steam inlet regulating valve 4 and a low pressure bypass regulating valve 5 is adjusted, so that the reheated steam is shunted to enter an intermediate pressure cylinder and a low bypass ejector of the steam turbine, and the ratio of the steam inlet flow of the intermediate pressure cylinder to the steam inlet flow of the high pressure cylinder keeps near the design ratio; and the steam at the outlet of the low-side ejector flows to a heat supply steam main pipe.
In the above embodiment, the superheated steam at the outlet of the boiler is divided into two paths according to the thermoelectric load: one path of the steam enters a high-side ejector to eject the exhaust steam of the intermediate pressure cylinder, the other path of the steam enters the high-pressure cylinder to do work, the steam at the outlet of the high-side ejector and the exhaust steam of the high-pressure cylinder enter a reheater, part of the reheated steam enters the intermediate pressure cylinder to do work, and part of the reheated steam enters a low-side ejector to eject the exhaust steam of the low-pressure cylinder, the outlet of the low-side ejector is the heat supply steam, and a high-low-side double-ejection thermoelectric peak regulation system of a steam turbine is adopted to enable thermoelectric flexible regulation and the thermoelectric peak regulation capacity and the deep electric.
Compared with the prior art, the high-side ejector is a supercritical pressure and large pressure difference ejector, and the steam pressure at the inlet of the ejector can be more than 22.12 MPa.
The embodiment solves the problem of thermoelectric coupling of the coal-fired thermal power plant, the thermoelectric load is flexibly adjusted in winter heat supply period, the heat supply is maximized, and the heat supply output is increased by more than 60%; meanwhile, the steam inlet quantity of the steam turbine can be minimized, deep electric peak regulation is realized, the thermoelectric peak regulation capability and the operation adaptability of the coal-fired unit are obviously improved, and the safety and the economical efficiency of thermoelectric peak regulation operation of the coal-fired thermal power plant are ensured.
Claims (4)
1. A thermoelectric peak regulation method for a coal-fired unit is characterized by comprising the following steps: the thermoelectric peak regulation method of the coal-fired unit is based on a thermoelectric peak regulation method of a high-low side double-injection system, the high-low side double-injection system is composed of a high side injector and a communication pipeline and a regulating valve thereof, a reheater, a low side injector and a communication pipeline and a regulating valve thereof, thermoelectric complete essential decoupling, heat supply maximization and deep electric peak regulation are realized, and the specific method is as follows:
(1) determining the steam flow at the outlet of the boiler according to the total load of the heat and electricity; according to the magnitude of the thermal load and the electrical load, the opening degrees of a high-pressure bypass adjusting valve and a steam inlet adjusting valve of a high-pressure cylinder of the steam turbine are changed, so that superheated steam is shunted and enters a high-pressure bypass ejector and the high-pressure cylinder of the steam turbine respectively; the steam at the outlet of the high-side ejector and the exhaust steam of the high-pressure cylinder are combined and enter a reheater;
(2) regulating the steam flow entering the throat of the high-side ejector and the low-pressure cylinder by changing the opening of a steam inlet regulating valve of the low-pressure cylinder;
(3) the opening degree of the steam inlet regulating valve of the intermediate pressure cylinder and the opening degree of the low-pressure bypass regulating valve are adjusted, so that the reheated steam is shunted to enter the intermediate pressure cylinder and the low-pressure bypass ejector of the steam turbine, and the ratio of the steam inlet flow of the intermediate pressure cylinder to the steam inlet flow of the high pressure cylinder keeps near the design ratio; and the steam at the outlet of the low-side ejector flows to a heat supply steam main pipe.
2. The coal-fired unit thermoelectric peak shaving method of claim 1, characterized in that: the inlet steam pressure of the high side ejector can be supercritical pressure, namely can be more than 22.12 MPa.
3. The coal-fired unit thermoelectric peak shaving method of claim 1, characterized in that: the inlet of the high-side ejector is connected with a high-pressure bypass pipeline of the steam turbine, the throat of the high-side ejector is connected with a medium-pressure cylinder steam exhaust pipeline, and the outlet of the high-side ejector is connected with a reheater steam inlet pipeline.
4. The coal-fired unit thermoelectric peak shaving method of claim 1, characterized in that: the inlet of the low side ejector is connected with the outlet steam pipeline of the reheater, the throat of the low side ejector is connected with the low pressure cylinder steam exhaust pipeline, and the outlet of the low side ejector is connected with the heat supply steam pipeline.
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| CN202010943731.5A CN112050190A (en) | 2020-09-09 | 2020-09-09 | Thermoelectric peak regulation method for coal-fired unit |
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| CN202010943731.5A CN112050190A (en) | 2020-09-09 | 2020-09-09 | Thermoelectric peak regulation method for coal-fired unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383176A (en) * | 2021-12-09 | 2022-04-22 | 华电国际电力股份有限公司天津开发区分公司 | Supercritical reheating double-backpressure-machine double-steam-extraction industrial heating system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996191A (en) * | 2012-12-26 | 2013-03-27 | 北京国电蓝天节能科技开发有限公司 | Double-extraction adjustable heating system of thermal power generating unit |
| CN108361086A (en) * | 2018-02-08 | 2018-08-03 | 西安交通大学 | A kind of energy saving thermoelectricity decoupled system and operation method |
| CN110656991A (en) * | 2019-11-05 | 2020-01-07 | 清华大学 | Injection gas distribution thermoelectric decoupling mode based on axial thrust balance and reheating balance |
| CN110701663A (en) * | 2019-11-05 | 2020-01-17 | 清华大学 | Injection type heat pump exhaust steam recovery heat supply mode and system based on complete thermoelectric decoupling |
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2020
- 2020-09-09 CN CN202010943731.5A patent/CN112050190A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996191A (en) * | 2012-12-26 | 2013-03-27 | 北京国电蓝天节能科技开发有限公司 | Double-extraction adjustable heating system of thermal power generating unit |
| CN108361086A (en) * | 2018-02-08 | 2018-08-03 | 西安交通大学 | A kind of energy saving thermoelectricity decoupled system and operation method |
| CN110656991A (en) * | 2019-11-05 | 2020-01-07 | 清华大学 | Injection gas distribution thermoelectric decoupling mode based on axial thrust balance and reheating balance |
| CN110701663A (en) * | 2019-11-05 | 2020-01-17 | 清华大学 | Injection type heat pump exhaust steam recovery heat supply mode and system based on complete thermoelectric decoupling |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383176A (en) * | 2021-12-09 | 2022-04-22 | 华电国际电力股份有限公司天津开发区分公司 | Supercritical reheating double-backpressure-machine double-steam-extraction industrial heating system |
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