CN113074026B - Control method of steam turbine high-pressure cylinder steam inlet pipeline drainage valve - Google Patents
Control method of steam turbine high-pressure cylinder steam inlet pipeline drainage valve Download PDFInfo
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- CN113074026B CN113074026B CN202110362601.7A CN202110362601A CN113074026B CN 113074026 B CN113074026 B CN 113074026B CN 202110362601 A CN202110362601 A CN 202110362601A CN 113074026 B CN113074026 B CN 113074026B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
Abstract
The invention discloses a control method of a steam turbine high-pressure cylinder steam inlet pipeline drain valve, which comprises the following steps: setting automatic switching logic of a front pipeline drain valve of the high-pressure main steam combined valve, and if the following conditions are met simultaneously, opening the front pipeline drain valve of the high-pressure main steam combined valve: the degree of superheat of pipeline steam is less than 13.9 ℃, an FDX ignition signal is continuously on, and two optional conditions are adopted; setting automatic closing logic of a front pipeline drain valve of the high-pressure main steam combined valve, and closing the front pipeline drain valve of the high-pressure main steam combined valve if the following conditions are met simultaneously: pipeline steam superheat is >27.8 ℃, the FDX ignition signal is on continuously, and four selectable conditions. The invention fully utilizes the high-pressure steam drum pressure of the shutdown clearance of the unit, ensures the smooth thermal start of the unit and realizes the self supply of auxiliary steam; the automation level of the unit is further improved, and misoperation of operators is effectively avoided; further improving the steam inlet speed of the high-pressure cylinder of the steam turbine and effectively reducing the hot-start gas consumption of the unit.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to a control method of a drain valve of a steam inlet pipeline of a high-pressure cylinder of a steam turbine.
Background
When the 9FA gas-steam combined cycle unit normally operates, the unit load consists of a gas turbine load and a steam turbine load. After the unit is started in a hot state and connected to the grid, the unit load is the gas turbine load, the unit keeps the exhaust temperature of the gas turbine lower than a certain value (566 ℃) by controlling the gas turbine load, and high-pressure main steam is slowly heated, so that a high-pressure steam cylinder of the steam turbine meets the steam inlet condition (the pressure of the main steam is higher than 39kg/cm & lt 2 & gt, and the temperature of the main steam is higher than the temperature of the upper wall of the high-pressure steam inlet cylinder), and the steam turbine load is added. Before steam admission of the steam turbine, the working medium quantity of a reheater system is limited, and in order to prevent damage to metal components caused by dry burning of the reheater system due to overhigh exhaust temperature of fuel gas, the load of a combustion engine is controlled to be a lower value in a stage of waiting for steam admission of a high-pressure cylinder of the steam turbine, so that the waiting time of the stage is shortened, and reduction of hot start gas consumption of a unit is facilitated.
Because the measuring point of the steam inlet working medium parameter of the high-pressure cylinder of the steam turbine is positioned between the inlet of the high-pressure bypass pipeline and the high-pressure main steam combined valve, a circulation dead zone is easily formed on the section of the pipeline before the steam inlet of the high-pressure cylinder of the steam turbine, and the quality of the working medium is not qualified. Therefore on the basis of setting up the high pressure bypass and carrying out working medium quality promotion, the preceding pipeline trap before through opening high pressure main vapour combination valve in good time increases the main vapour circulation for steam turbine high pressure jar admission: after the unit is ignited, when the superheat degree of main steam is lower than 13.9 ℃, a drain valve of a main steam pipeline in front of the high-pressure main steam combination valve is automatically opened, and an operator changes the valve into a manual state; the operator changes the valve into automatic state after high pressure steam inlet, when the superheat degree of the main steam is higher than 27.8 ℃, the drain valve of the main steam pipeline in front of the high pressure main steam combination valve is automatically closed.
The original switching logic of the drain valve of the front pipeline of the high-pressure main steam combined valve has obvious effect on accelerating the steam admission of the high-pressure cylinder of the steam turbine. There are still certain disadvantages: 1. in order to further respond to the policy of energy conservation and consumption reduction, the unit completes the self-supply transformation of the hot-state starting auxiliary steam in 2019, namely, high-pressure steam drum steam and medium-pressure steam drum steam are adopted to provide the hot-state starting steam for the unit, and the use of the natural gas for starting the boiler is reduced. The existing hot-state starting is mostly carried out by adopting the mode, so that the steam trap of the main steam pipeline in front of the high-pressure main steam combination valve is started after ignition, the pressure of the high-pressure steam drum is too quickly lost, and the auxiliary steam self-supply is not favorably and smoothly completed. Under the condition that the mode is not adopted for hot starting, the valve is started after ignition, unnecessary loss of the pressure of a high-pressure steam pocket can exist, and the effect of accelerating steam admission is reduced; 2. the automatic and manual modes of the valve need to be manually switched and adjusted to control the opening and closing of the valve, so that the possibility of improper operation exists, and the concept of high automation of a digital power plant is contradicted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control method of a steam inlet pipeline drainage valve of a high-pressure cylinder of a steam turbine.
The purpose of the invention is realized by the following technical scheme:
a control method for a steam trap valve of a steam inlet pipeline of a high-pressure cylinder of a steam turbine comprises the following steps:
setting automatic switching logic of a front pipeline drain valve of the high-pressure main steam combined valve, and if the following conditions are met simultaneously, opening the front pipeline drain valve of the high-pressure main steam combined valve:
the degree of superheat of pipeline steam is less than 13.9 ℃, an FDX ignition signal is continuously generated, and two optional conditions are provided;
setting automatic closing logic of a front pipeline drain valve of the high-pressure main steam combined valve, and closing the front pipeline drain valve of the high-pressure main steam combined valve if the following conditions are met simultaneously:
the tube steam superheat was >27.8 ℃, the FDX ignition signal persisted, and four selectable conditions.
The two selectable conditions are logical or relations, and specifically include: the first is the unit rotating speed >2000rpm, and the second is the continuous existence of the L94X shutdown signal.
The four selectable conditions are logical or relations, which specifically include: the method comprises the steps that firstly, a unit hot-state starting mode signal is continuous, the CV opening degree of a control valve in a high-pressure main steam combined valve is larger than 5%, secondly, an L94X shutdown signal is continuous, thirdly, a unit cold-state starting mode signal is continuous, and fourthly, a unit warm-state starting mode signal is continuous.
The high-pressure main steam combined valve is sequentially a control valve and a stop valve.
And the pipeline steam superheat measuring point is positioned between the inlet of the high-pressure bypass pipeline and the high-pressure main steam combined valve.
The invention has the beneficial effects that:
the invention fully utilizes the high-pressure steam drum pressure of the shutdown clearance of the unit, ensures the smooth thermal start of the unit and realizes the self supply of auxiliary steam; the automation level of the unit is further improved, and misoperation of operators is effectively avoided; the steam inlet speed of the high-pressure cylinder of the steam turbine is further increased, and the hot-state starting gas consumption of the unit is effectively reduced.
Drawings
FIG. 1 is a diagram illustrating the automatic valve opening logic of the present invention;
FIG. 2 is a schematic diagram of the automatic valve shut-off logic of the present invention;
fig. 3 is an explanatory view of the layout of the apparatus of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
In this embodiment, as shown in fig. 1 and 2, a control method for a drain valve of a steam inlet pipe of a high-pressure cylinder of a steam turbine includes the following steps:
setting automatic switching logic of a front pipeline drain valve of the high-pressure main steam combined valve, and if the following conditions are met simultaneously, opening the front pipeline drain valve of the high-pressure main steam combined valve:
the degree of superheat of pipeline steam is less than 13.9 ℃, an FDX ignition signal is continuously on, and two optional conditions are adopted;
setting automatic closing logic of a front pipeline drain valve of the high-pressure main steam combined valve, and closing the front pipeline drain valve of the high-pressure main steam combined valve if the following conditions are met simultaneously:
pipeline steam superheat is >27.8 ℃, the FDX ignition signal is on continuously, and four selectable conditions.
The two selectable conditions are logical or relations, and specifically include: the first is the unit rotating speed >2000rpm, and the second is the continuous existence of the L94X shutdown signal.
The four selectable conditions are logical or relations, which specifically include: the method comprises the steps that firstly, a unit hot-state starting mode signal is continuous, the CV opening degree of a control valve in a high-pressure main steam combined valve is larger than 5%, secondly, an L94X shutdown signal is continuous, thirdly, a unit cold-state starting mode signal is continuous, and fourthly, a unit warm-state starting mode signal is continuous.
As shown in fig. 3, the high-pressure main steam combination valve is a control valve and a stop valve in sequence; and the pipeline steam superheat measuring point is positioned between the inlet of the high-pressure bypass pipeline and the high-pressure main steam combined valve.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A control method for a steam trap valve of a steam inlet pipeline of a high-pressure cylinder of a steam turbine is characterized by comprising the following steps:
setting automatic switching logic of a front pipeline drain valve of the high-pressure main steam combined valve, and if the following conditions are met simultaneously, opening the front pipeline drain valve of the high-pressure main steam combined valve:
the degree of superheat of pipeline steam is less than 13.9 ℃, an FDX ignition signal is continuously generated, and two optional conditions are provided; the two selectable conditions are logical or relations, and specifically include: the first is that the rotating speed of the unit is more than 2000rpm, and the second is that the L94X stop signal continuously exists;
setting automatic closing logic of a front pipeline drain valve of the high-pressure main steam combined valve, and closing the front pipeline drain valve of the high-pressure main steam combined valve if the following conditions are met simultaneously:
the degree of superheat of pipeline steam is greater than 27.8 ℃, an FDX ignition signal is continuously on, and four optional conditions are met; the four selectable conditions are logical or relations, which specifically include: the control valve CV opening degree in the high-pressure main steam combined valve is larger than 5% when the unit hot-state starting mode signal is continuous, the L94X stop signal is continuous, the unit cold-state starting mode signal is continuous, and the unit warm-state starting mode signal is continuous.
2. The method for controlling the steam trap valve of the steam turbine high pressure cylinder steam inlet pipeline according to claim 1, wherein the high pressure main steam combination valve is a control valve and a stop valve in sequence.
3. The method for controlling the steam trap valve of the steam inlet pipeline of the high-pressure cylinder of the steam turbine as claimed in claim 1, wherein the pipeline steam superheat measuring point is located between the inlet of the high-pressure bypass pipeline and the high-pressure main steam combination valve.
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| CN202110362601.7A CN113074026B (en) | 2021-04-02 | 2021-04-02 | Control method of steam turbine high-pressure cylinder steam inlet pipeline drainage valve |
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| CN202110362601.7A CN113074026B (en) | 2021-04-02 | 2021-04-02 | Control method of steam turbine high-pressure cylinder steam inlet pipeline drainage valve |
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| CN113074026B true CN113074026B (en) | 2023-02-21 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1410320A (en) * | 1973-06-12 | 1975-10-15 | Westinghouse Electric Corp | Arrangement for controlling the loading of a turbine system |
| JPS5937208A (en) * | 1982-04-16 | 1984-02-29 | Hitachi Ltd | Protection for steam turbine |
| CN103573303A (en) * | 2013-11-12 | 2014-02-12 | 中国电力工程顾问集团西南电力设计院 | Thermal power plant generator set adopting superheat to control drain valve on main steam pipeline |
| CN103573304A (en) * | 2013-11-12 | 2014-02-12 | 中国电力工程顾问集团西南电力设计院 | Thermal power plant generator set adopting superheat to control drain valve on reheat steam pipeline |
| JP2016070554A (en) * | 2014-09-29 | 2016-05-09 | 三浦工業株式会社 | Steam superheating system |
| CN105781629A (en) * | 2016-03-30 | 2016-07-20 | 国核电力规划设计研究院 | Control method of steam turbine steam pipeline drain valve of power station |
| CN108678814A (en) * | 2018-05-14 | 2018-10-19 | 哈尔滨汽轮机厂有限责任公司 | Steam turbine sequence starts method |
| CN110159365A (en) * | 2019-06-12 | 2019-08-23 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of sequence starting method of the small steam turbine of two-shipper backheat |
-
2021
- 2021-04-02 CN CN202110362601.7A patent/CN113074026B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1410320A (en) * | 1973-06-12 | 1975-10-15 | Westinghouse Electric Corp | Arrangement for controlling the loading of a turbine system |
| JPS5937208A (en) * | 1982-04-16 | 1984-02-29 | Hitachi Ltd | Protection for steam turbine |
| CN103573303A (en) * | 2013-11-12 | 2014-02-12 | 中国电力工程顾问集团西南电力设计院 | Thermal power plant generator set adopting superheat to control drain valve on main steam pipeline |
| CN103573304A (en) * | 2013-11-12 | 2014-02-12 | 中国电力工程顾问集团西南电力设计院 | Thermal power plant generator set adopting superheat to control drain valve on reheat steam pipeline |
| JP2016070554A (en) * | 2014-09-29 | 2016-05-09 | 三浦工業株式会社 | Steam superheating system |
| CN105781629A (en) * | 2016-03-30 | 2016-07-20 | 国核电力规划设计研究院 | Control method of steam turbine steam pipeline drain valve of power station |
| CN108678814A (en) * | 2018-05-14 | 2018-10-19 | 哈尔滨汽轮机厂有限责任公司 | Steam turbine sequence starts method |
| CN110159365A (en) * | 2019-06-12 | 2019-08-23 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of sequence starting method of the small steam turbine of two-shipper backheat |
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