CN116658258A - Double-load steam turbine suitable for deep peak shaving and control method - Google Patents
Double-load steam turbine suitable for deep peak shaving and control method Download PDFInfo
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- CN116658258A CN116658258A CN202310836003.8A CN202310836003A CN116658258A CN 116658258 A CN116658258 A CN 116658258A CN 202310836003 A CN202310836003 A CN 202310836003A CN 116658258 A CN116658258 A CN 116658258A
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- 230000007246 mechanism Effects 0.000 claims abstract description 45
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 230000009977 dual effect Effects 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
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- 239000003245 coal Substances 0.000 abstract description 5
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- 230000003044 adaptive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a double-load steam turbine suitable for deep peak shaving and a control method, wherein the double-load steam turbine comprises a cylinder (7), a rotor (8) arranged in the cylinder and a through-flow part arranged in the cylinder (7), and the double-load steam turbine is characterized in that the through-flow part comprises a first through-flow part (3) and a second through-flow part (6) which are arranged in series and are arranged in the same rotor (8), an air inlet mechanism of the first through-flow part (3) comprises a first through-flow steam inlet valve (1) and a first through-flow steam inlet cavity (2), an air inlet mechanism of the second through-flow part (6) comprises a second through-flow steam inlet valve (4) and a second through-flow steam inlet cavity (5), and the corresponding through-flow area and the size of the air inlet mechanism of the second through-flow part (6) are larger than those of the first through-flow part (3). The steam turbine has two optimal power points, and the actual operation efficiency of the steam turbine can deviate from the optimal design point to be minimum, so that the heat consumption and the coal consumption of the unit partial load are reduced.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a coal-to-electricity turbine suitable for deep peak shaving. The invention also relates to a control method for controlling the steam turbine.
Background
The steam distribution mode of the steam turbine is generally divided into nozzle adjustment and throttle adjustment.
The nozzle regulating turbine is provided with a plurality of groups of nozzle chambers, the turbine steam inlet regulating valves are respectively connected with the groups of nozzles, and when the turbine unit operates, the turbine adopts partial steam inlet to regulate the power generation load by controlling the turbine steam inlet regulating valves. The nozzle-adjusting steam turbine can be operated at constant pressure or in a composite sliding pressure mode, the steam turbine inlet pressure is higher than the throttle adjustment, the circulation efficiency is higher, but the efficiency of the high-pressure cylinder of the steam turbine is lower because of partial inlet steam.
The throttle regulating unit is not provided with a regulating stage, the steam inlet regulating valve of the steam turbine is directly connected with the first pressure stage, the steam inlet quantity is controlled through the regulating valve during operation, the steam inlet pressure changes along with the load, and the sliding pressure operates.
The high-medium pressure flow area of a steam turbine is usually designed for rated or maximum load. For the nozzle regulating unit, the flow area is designed according to the maximum evaporation capacity of the boiler, and the design power of the fully-opened working condition of the valve is far greater than the rated load due to the factors such as working condition in summer, aging of the unit and the like, when the unit is operated under partial load, the inlet steam pressure and the flow are regulated and controlled through the nozzle, the main steam pressure can be controlled at the rated value or a higher value, but the cylinder efficiency is lower, and the efficiency of the partial load cylinder is reduced greatly. For a throttling regulation turbine, the flow area is not adjustable, so that the full-working-condition sliding pressure operation is realized, and the efficiency change amplitude of the turbine cylinder is small, but the circulation efficiency is reduced due to the reduction of the main steam pressure.
At present, the coal consumption of the thermal power generating unit in a peak regulation state is generally increased greatly, and according to statistics, the coal consumption of 30% of load is increased by about 25%.
This situation is not very economically viable for turbines operating with substantial loads, but it is unacceptable for peak shaving units to have significantly reduced economic efficiency.
Disclosure of Invention
The invention aims to provide a double-load steam turbine suitable for deep peak shaving so as to solve the technical problems.
Another object of the present invention is to provide a method for regulating the double-load steam turbine.
In order to achieve the above purpose, the invention provides a dual-load steam turbine suitable for deep peak shaving, which comprises a cylinder, a rotor arranged in the cylinder, and a through-flow part arranged in the cylinder, wherein the through-flow part comprises a first through-flow part and a second through-flow part which are arranged in series and are arranged in the same rotor, an air inlet mechanism of the first through-flow part comprises a first through-flow steam inlet valve and a first through-flow steam inlet cavity, an air inlet mechanism of the second through-flow part comprises a second through-flow steam inlet valve and a second through-flow steam inlet cavity, and the corresponding through-flow area and the corresponding air inlet mechanism size of the second through-flow part are larger than those of the first through-flow part.
Optionally, the first through-flow part is a low-load through-flow part, and the flow area of the first through-flow part is adapted to the partial load of the steam turbine.
Optionally, the second through-flow part is a full-load through-flow part, and the flow area of the second through-flow part is adapted to the rated power or the maximum power of the steam turbine.
Optionally, the steam distributing mechanism of the first through-flow part is a nozzle-adjusting steam distributing mechanism.
Optionally, the steam distributing mechanism of the first through-flow part is a throttle adjusting steam distributing mechanism.
Optionally, the steam distributing mechanism of the second through-flow part is a nozzle-adjusting steam distributing mechanism.
Optionally, the steam distributing mechanism of the second through-flow part is a throttle adjusting type steam distributing mechanism.
Optionally, the air inlet mechanisms of the first through-flow part and the second through-flow part are connected with the same air inlet source.
Optionally, an external heat supply steam extraction flow path is arranged at the upstream of the first through flow steam inlet valve.
In order to achieve the above another object, the present invention further provides a control method of a dual load steam turbine, for controlling the dual load steam turbine suitable for deep peak shaving according to any one of the above technical solutions, including:
starting a steam inlet mechanism of the first through-flow part, gradually fully opening a first through-flow steam inlet valve along with the continuous increase of the power of the steam turbine, and enabling the steam turbine to enter a sliding pressure operation mode until the steam parameters reach rated values and the power of the steam turbine reaches a first optimal design point;
when the power of the steam turbine exceeds the optimal design point of the flow area of the first through flow part, the second through flow steam inlet valve is opened, the opening of the first through flow steam inlet valve is kept unchanged, and the opening of the second through flow steam inlet valve is gradually increased, so that the steam turbine reaches a required load value;
when the turbine reaches the required load value but not reaching the rated or maximum load value, under the premise of keeping the load value unchanged and the condition of keeping the first through-flow steam inlet valve at the maximum opening, the turbine enters a sliding pressure operation mode under the control of the second through-flow steam inlet valve by adjusting the steam pressure, and a certain pre-throttling amount is reserved for the second through-flow steam inlet valve;
when the turbine reaches the rated load value, the steam parameters reach the rated value at the same time.
The double-load steam turbine provided by the invention has the advantages that the first through-flow part and the second through-flow part are arranged in a serial manner on the same rotor in the cylinder, and the corresponding through-flow area and the size of the air inlet mechanism of the second through-flow part are larger than those of the first through-flow part. The through-flow structure can expand the operation range of the high-efficiency load of the steam turbine, so that the steam turbine has two optimal power points, the first through-flow part with small area and the steam inlet mechanism thereof are used for controlling the power when in low-load operation, the steam turbine is positioned at the first optimal power point, the second through-flow part with large area and the steam inlet mechanism thereof are used for controlling the power when in high-load operation, and the steam turbine is positioned at the second optimal power point, thereby the actual operation efficiency of the steam turbine deviates from the optimal design point to the minimum, the steam inlet pressure of the partial-load steam turbine can be improved, the circulation efficiency can be improved, the heat consumption and the coal consumption of the partial load of a unit can be reduced, and the deep peak shaving of the generating unit is suitable.
Drawings
FIG. 1 is a schematic diagram of a dual load turbine adapted for deep peak shaving according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method of a dual load turbine according to an embodiment of the present invention.
In the figure:
1. the first through-flow steam inlet valve 2, the first through-flow steam inlet cavity 3, the first through-flow part 4, the second through-flow steam inlet valve 5, the second through-flow steam inlet cavity 6, the second through-flow part 7, the cylinder 8 and the rotor
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
In the present specification, the terms "upper, lower, inner, outer" and the like are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may be changed according to the drawings, so that the terms are not to be construed as absolute limitation of the protection scope; moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a dual-load steam turbine suitable for deep peak shaving according to an embodiment of the present invention.
As shown in the figure, in a specific embodiment, the dual-load steam turbine suitable for deep peak shaving provided by the invention can be used for carrying out flow area switching along with the change of the power of the steam turbine, that is, can be used for carrying out flow area conversion along with the change of the load.
Structurally, the steam turbine mainly comprises a cylinder 7, a rotor 8 arranged in the cylinder 7, a through-flow part positioned in the cylinder 8 and the like, wherein the through-flow part is divided into two parts, namely a first through-flow part 3 and a second through-flow part 6, the first through-flow part 3 and the second through-flow part 6 are positioned in the same cylinder 7 and are arranged on the same rotor 8, torque is transmitted through the same rotor 8, and the first through-flow part 3 and the second through-flow part 6 are communicated and are arranged in series in the axial direction, and the first through-flow part 3 is positioned at the upstream of the second through-flow part 6.
The air inlet mechanism of the first through-flow part 3 is provided with a first through-flow steam inlet valve 1 and a first through-flow steam inlet cavity 2, the air inlet mechanism of the second through-flow part 6 is provided with a second through-flow steam inlet valve 4 and a second through-flow steam inlet cavity 5, and the flow area and the air inlet mechanism size of the second through-flow part 6 are larger than those of the first through-flow part 3.
Specifically, the first through-flow part 3 is a low-load through-flow part, the through-flow area of the first through-flow part is adapted to the partial load of the steam turbine, the area design is carried out according to the partial power requirement of the steam turbine, and the corresponding through-flow area and the size of the steam inlet mechanism are smaller.
The second through-flow part 6 is a full-load through-flow part, the through-flow area of the second through-flow part is adaptive to the rated power or the maximum power of the steam turbine, the through-flow area is designed according to the rated power or the maximum load requirement, and the corresponding through-flow area and the size of the steam inlet mechanism are larger.
To accommodate this configuration, the outer diameter of the cylinder 7 corresponding to the first through-flow portion 3 is small, the outer diameter of the cylinder 7 corresponding to the second through-flow portion 6 is large, and the two radial dimensions are relaxed.
According to the operation mode and the operation flexibility requirement of the steam turbine, the steam distribution mode of the first through-flow part 3 can adopt a nozzle adjusting mode or a throttling adjusting mode, and the steam distribution mode of the second through-flow part 6 can adopt a throttling adjusting mode or a nozzle adjusting mode.
The air inlet mechanisms of the first through-flow part 3 and the second through-flow part 6 are connected with the same air inlet source, and the first through-flow part 3 and the air inlet mechanism thereof have smaller size, so the air inlet mechanism is suitable for externally supplying heat and extracting steam before the first through-flow air inlet valve 1.
The through-flow structure can expand the range of high-efficiency load of the steam turbine, so that the steam turbine has two optimal power points, the first through-flow part 3 with small area and the steam inlet mechanism thereof are used for controlling the power when in low-load operation, the steam turbine is positioned at the first optimal power point, the second through-flow part 6 with large area and the steam inlet mechanism thereof are used for controlling the power when in high-load operation, and the steam turbine is positioned at the second optimal power point, thereby the actual operation efficiency of the steam turbine deviates from the optimal design point to the minimum, the steam inlet pressure of the partial-load steam turbine can be improved, the circulation efficiency can be improved, the heat consumption and the coal consumption of the partial load of a unit can be reduced, and the deep peak shaving of the generating unit is suitable.
The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of these, specific adjustments may be made according to actual needs, thereby obtaining different embodiments. For example, the number of through-flow stages and the through-flow pitch of the first through-flow section 3 and the second through-flow section 6 may be equal or unequal, and the like. This is not illustrated here, as there are many possible implementations.
Referring to fig. 2, fig. 2 is a flowchart of a control method of a dual load turbine according to an embodiment of the invention.
In addition to the dual load turbine suitable for deep peaking as described above, the present invention also provides a dual load turbine control method for controlling the dual load turbine suitable for deep peaking as described above.
The method specifically comprises the following steps:
s10: when the steam turbine operates, firstly, a steam inlet mechanism of the first through-flow part 3 is started, steam enters the first through-flow part 3 through the first through-flow steam inlet valve 1 and the first through-flow steam inlet cavity 2, enters the second through-flow part 6 with a larger area after flowing through the first through-flow part 3 with a smaller area, continuously works, and is discharged from a steam outlet of the cylinder 7, and the steam flow is shown as a dotted line in the figure.
The specific volume becomes larger gradually after the steam does work, which is consistent with the design characteristic that the area of the second through-flow part 6 is larger than that of the first through-flow part 3. When the power of the steam turbine continues to be increased, the first through flow steam inlet valve 1 is gradually fully opened, and the steam turbine enters a sliding pressure operation mode until the steam parameters reach the rated values and the power of the steam turbine reaches a first optimal design point.
S20: when the power of the steam turbine exceeds the optimal design point of the area of the first through-flow part 3, the steam inlet mechanism of the second through-flow part 6 is gradually opened. At this time, the opening of the first through-flow steam inlet valve 1 is kept unchanged, and the opening of the second through-flow steam inlet valve 4 is gradually increased, so that the steam turbine reaches a required load value.
In this process, since the steam flow in the second through-flow portion 6 gradually increases, the steam pressure of each stage in the through-flow gradually increases, resulting in an automatic gradual decrease in the steam flow in the first through-flow portion 3. At this time, new steam flows into both the first through-flow portion 3 and the second through-flow portion 6, and the steam flow is shown by the broken line and the solid line in the figure.
S30: when the turbine reaches the required load value but not the rated or maximum load value, the turbine enters a sliding pressure operation mode under the control of the second through-flow steam inlet valve 4 by adjusting the steam pressure under the condition that the load value is unchanged and the first through-flow steam inlet valve 1 is kept at the maximum opening, and finally, the second through-flow steam inlet valve 4 is kept at a certain pre-throttling amount.
By reserving the pre-throttling quantity for the second through-flow steam inlet valve 4, the requirement of grid frequency modulation can be met in the actual use process, the electric energy quality is improved through frequency modulation, the system frequency is kept stable, and the safe and reliable operation of the system is ensured.
In addition, as the second through-flow steam inlet valve 4 keeps a certain pre-throttling capacity, the pressure in the second through-flow steam inlet cavity 5 is lower than that in the first through-flow steam inlet cavity 2, and the pressure difference can ensure that a small amount of steam flows in the first through-flow part 3, so that the cooling through-flow effect is realized.
S40: when the turbine reaches the rated load value, the steam parameters reach the rated value at the same time.
The double-load steam turbine suitable for deep peak shaving and the control method provided by the invention are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. Be suitable for dual load steam turbine of degree of depth peak shaving, include cylinder (7), locate rotor (8) of cylinder and be located the inside through-flow portion of cylinder (7), its characterized in that, through-flow portion is including locating first through-flow portion (3) and second through-flow portion (6) of same rotor (8) and series arrangement, the air inlet mechanism of first through-flow portion (3) includes first through-flow steam inlet valve (1) and first through-flow steam inlet chamber (2), the air inlet mechanism of second through-flow portion (6) includes second through-flow steam inlet valve (4) and second through-flow steam inlet chamber (5), the through-flow area and the air inlet mechanism size that second through-flow portion (6) corresponds are greater than the through-flow area and the air inlet mechanism size of first through-flow portion (3).
2. Double-load steam turbine suitable for deep peaking according to claim 1, characterized in that the first through-flow part (3) is a low-load through-flow part, the flow area of which is adapted to the part load of the steam turbine.
3. Double-load steam turbine suitable for deep peaking according to claim 1, characterized in that the second through-flow part (6) is a full-load through-flow part, the flow area of which is adapted to the rated or maximum power of the steam turbine.
4. Double-load steam turbine suitable for deep peaking according to claim 2, characterized in that the steam distribution mechanism of the first through-flow part (3) is a nozzle-regulated steam distribution mechanism.
5. Double-load steam turbine suitable for deep peaking according to claim 2, characterized in that the steam distributing mechanism of the first through-flow part (3) is a throttle-regulated steam distributing mechanism.
6. A double-load steam turbine adapted for deep peaking according to claim 3, characterized in that the steam distribution mechanism of the second through-flow part (6) is a nozzle-regulated steam distribution mechanism.
7. A double-load steam turbine suitable for deep peaking according to claim 3, characterized in that the steam distribution mechanism of the second through-flow part (6) is a throttle-regulated steam distribution mechanism.
8. Double-load steam turbine suitable for deep peaking according to any one of claims 1 to 7, characterized in that the air inlet mechanisms of the first through-flow part (3) and the second through-flow part (6) are connected to the same air inlet source.
9. The double-load steam turbine suitable for deep peak shaving according to claim 8, wherein an external heat supply steam extraction flow path is arranged upstream of the first through-flow steam inlet valve (1).
10. A dual load turbine control method for controlling the dual load turbine adapted for deep peaking according to any one of claims 1 to 9, comprising:
starting a steam inlet mechanism of the first through-flow part (3), gradually fully opening a first through-flow steam inlet valve (1) along with the continuous increase of the power of the steam turbine, and enabling the steam turbine to enter a sliding pressure operation mode until the steam parameters reach a rated value and the power of the steam turbine reaches a first optimal design point;
when the power of the steam turbine exceeds the optimal design point of the flow area of the first through-flow part (3), opening the second through-flow steam inlet valve (4), keeping the opening degree of the first through-flow steam inlet valve (1) unchanged, and gradually increasing the opening degree of the second through-flow steam inlet valve (4) to enable the steam turbine to reach a required load value;
when the turbine reaches the required load value but not reaching the rated or maximum load value, on the premise of keeping the load value unchanged and under the condition of keeping the first through-flow steam inlet valve (1) at the maximum opening, the turbine enters a sliding pressure operation mode under the control of the second through-flow steam inlet valve (4) by adjusting the steam pressure, and a certain pre-throttling amount is reserved for the second through-flow steam inlet valve (4);
when the turbine reaches the rated load value, the steam parameters reach the rated value at the same time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310836003.8A CN116658258A (en) | 2023-07-07 | 2023-07-07 | Double-load steam turbine suitable for deep peak shaving and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310836003.8A CN116658258A (en) | 2023-07-07 | 2023-07-07 | Double-load steam turbine suitable for deep peak shaving and control method |
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| CN108252752A (en) * | 2017-12-22 | 2018-07-06 | 东方电气集团东方汽轮机有限公司 | A kind of steam turbine is into vapour adjusting method |
| CN114856725A (en) * | 2022-06-24 | 2022-08-05 | 上海电气电站设备有限公司 | Air inlet pressure adjusting system of turbo expander and turbo expander |
| CN115333165A (en) * | 2022-08-29 | 2022-11-11 | 上海明华电力科技有限公司 | Method for improving steam extraction heat supply and primary frequency modulation capacity under deep peak regulation working condition |
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2023
- 2023-07-07 CN CN202310836003.8A patent/CN116658258A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102278148A (en) * | 2010-06-12 | 2011-12-14 | 中国电力工程顾问集团华东电力设计院 | Full-period steam inlet steam turbine generator unit and primary frequency adjusting method thereof |
| CN101886556A (en) * | 2010-06-28 | 2010-11-17 | 青岛捷能汽轮机集团股份有限公司 | Steam compensating turbine |
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