CN111042880A - Wide-load high-efficiency steam turbine set with high-pressure cylinders coaxially arranged in separate cylinders - Google Patents
Wide-load high-efficiency steam turbine set with high-pressure cylinders coaxially arranged in separate cylinders Download PDFInfo
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- CN111042880A CN111042880A CN201811189661.8A CN201811189661A CN111042880A CN 111042880 A CN111042880 A CN 111042880A CN 201811189661 A CN201811189661 A CN 201811189661A CN 111042880 A CN111042880 A CN 111042880A
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- 238000010438 heat treatment Methods 0.000 claims description 7
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- 238000011084 recovery Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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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
- F01K13/02—Controlling, e.g. stopping or starting
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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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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Abstract
The invention relates to a wide-load high-efficiency steam turbine set with coaxially arranged high-pressure cylinders, which is respectively connected with a boiler, a heater and a condenser, and comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are sequentially connected, wherein the high-pressure cylinder is respectively connected with a main steam pipeline of the boiler, a cold and reheat steam pipeline of the boiler and the heater, the high-pressure cylinder is divided into two cylinders, and the two cylinders are respectively a cut high-pressure cylinder and a reserved high-pressure cylinder which are coaxially arranged; when the load is higher than a set threshold value, the two high-pressure cylinders simultaneously perform steam inlet work, and when the load is lower than the set threshold value, the cut-off high-pressure cylinder is cut off, but the cut-off high-pressure cylinder still maintains the rated rotating speed. Compared with the prior art, the invention has the advantages of greatly improving the operating economy of the generator set under the low load, further promoting energy conservation and emission reduction, and the like.
Description
Technical Field
The invention relates to the field of thermal power generation, in particular to a wide-load high-efficiency steam turbine unit with coaxially arranged high-pressure cylinders and distributed cylinders.
Background
Steam distribution modes of a steam turbine unit of a thermal power plant are mainly divided into two main types: the method is characterized in that the method is adopted in a newly-built supercritical (super) critical unit because the high-pressure cylinder efficiency is relatively high because the full-cycle steam inlet unit has no regulation stage. For the units, the high-pressure regulating valve is most economical in full-open sliding pressure operation, but at the middle-low load, the main steam pressure is reduced more after the sliding pressure operation, the units often operate in a subcritical region, and the characteristics of cleanness and high efficiency of the supercritical (supercritical) units are not fully exerted. The high pressure regulating valve is closed, although the main steam pressure can be improved, the main steam pressure is not compensated for the reasons of increasing throttling loss of the regulating valve and the like. The reduction of the primary parameter of the main steam pressure under medium and low load leads to the remarkable reduction of the cycle efficiency and the more increase of the power supply coal consumption rate.
On the other hand, due to the characteristics of energy structures in China, the thermal power generating unit exists for a long time as a basic power generation mode, participates in peak shaving or deep peak shaving of a power grid, and often operates at a middle-low load position. Especially, under the background that a large amount of new energy such as wind power, photovoltaic and the like are accessed at present and large-scale western and east power transmission of an extra-high voltage power grid is carried out, higher requirements are provided for flexibility control and peak shaving operation of thermal power.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a wide-load high-efficiency steam turbine set with high-pressure cylinders coaxially arranged in a split-cylinder manner.
The purpose of the invention can be realized by the following technical scheme:
a high-efficiency wide-load steam turbine set with coaxially arranged high-pressure cylinders is connected with a boiler, a heater and a condenser respectively, and comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are connected in sequence, wherein the high-pressure cylinder is connected with a main steam pipeline of the boiler, a cold and reheat steam pipeline of the boiler and the heater respectively, and the high-pressure cylinder is divided into two parts which are a cut high-pressure cylinder and a reserved high-pressure cylinder which are coaxially arranged;
when the load is higher than a set threshold value, the two high-pressure cylinders simultaneously perform steam inlet work, and when the load is lower than the set threshold value, the cut-off high-pressure cylinder is cut off, but the cut-off high-pressure cylinder still maintains the rated rotating speed.
Preferably, main steam pipelines of the boiler are respectively connected with the cut high-pressure cylinder and the reserved high-pressure cylinder through respective valves, when the load is higher than a set threshold value, main steam respectively enters the two high-pressure cylinders to do work simultaneously, and after the exhaust steam is collected, the main steam enters the boiler to be reheated.
Preferably, the cut high-pressure cylinder and the reserved high-pressure cylinder are coaxially arranged in opposite directions and used for balancing axial thrust.
Preferably, both the cut high-pressure cylinder and the reserved high-pressure cylinder have one path of steam extraction, and the steam extraction enters the heater after being gathered.
Preferably, a path of hot reheat steam pipeline is added to the boiler, and the hot reheat steam pipeline is connected with the cut high-pressure cylinder and used for heating the cut high-pressure cylinder so as to be convenient for quick recovery and use.
Preferably, the high-pressure cutting cylinder is connected with the condenser through a high-exhaust vent valve and used for exhausting steam and blast friction heat in the high-pressure cutting cylinder to the condenser through vacuum suction.
Preferably, the cut high-pressure cylinder maintains a rated rotating speed of 3000rpm, a high-exhaust ventilation valve is opened to take away blast friction heating, and in addition, heat is introduced in an appropriate amount according to the change condition of the cylinder temperature and then steam is heated to maintain a certain cylinder temperature, so that rapid steam admission and load carrying are facilitated.
Compared with the prior art, the invention has the following advantages:
1. the high-pressure cylinders are arranged in a cylinder-divided manner, one high-pressure cylinder is cut off under medium and low loads, and the main steam pressure is improved on the premise of not sacrificing the efficiency of the high-pressure cylinders, so that the running economy of the generator set is greatly improved, and the energy conservation and emission reduction are further promoted;
2. through the coaxial arrangement of the high-pressure cylinders, the high-pressure cylinders maintain the extremely hot rated rotating speed after being cut off, can quickly enter steam to recover acting, and is convenient for peak regulation, load changing and flexibility control.
Drawings
FIG. 1 is a schematic thermodynamic system diagram of a wide load high efficiency steam turbine of the present invention;
FIG. 2 is a graph showing the relationship between the assumed heat rate and the load after the cylinder arrangement according to the embodiment of the present invention.
Wherein 1 is the excision high pressure cylinder, 2 is the reservation high pressure cylinder, 3 is the intermediate pressure cylinder, 4 is the low pressure cylinder, 5 is the boiler, 51 is main steam conduit, 52 is hot reheat steam conduit, 53 is cold reheat steam conduit, 6 is high pressure heater, 7 is the condenser, 8 is the feed pump, 9 is the high vent valve that arranges.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
For the full-cycle steam-admission throttling regulation steam turbine unit, the operation of a high-pressure regulating valve and full-opening sliding pressure is the most economical, but the cycle efficiency is reduced due to the fact that the main steam pressure is greatly reduced under medium and low loads, and the factor is the main reason that the economical efficiency of the thermal power generating unit is poor under the medium and low loads. If the high-pressure regulating valve is simply closed, although the main steam pressure can be increased, the throttling loss of the regulating valve is increased, the efficiency of the high-pressure cylinder is reduced, and the reverse effect is obtained. If a method can be found, the operation economy under the medium-low load can be greatly improved by improving the main steam pressure on the premise of not reducing the efficiency of the high-pressure cylinder.
As shown in figure 1, a high-efficiency wide-load steam turbine set with high-pressure cylinders coaxially arranged in cylinders is connected with a boiler 5, a high-pressure heater 6 and a condenser 7 respectively, the steam turbine set comprises a high pressure cylinder, an intermediate pressure cylinder 3 and a low pressure cylinder 4 which are connected in sequence, the high pressure cylinder is respectively connected with a main steam pipeline 51 of a boiler 5, a cold reheating steam pipeline 53 of the boiler and a high pressure heater 6, the high-pressure cylinder is divided into two parts, namely a cutting high-pressure cylinder 1 and a reserving high-pressure cylinder 2 which are coaxially arranged, simultaneously performing steam admission work on 2 high-pressure cylinders in a high-load area, cutting off 1 of the high-pressure cylinders under medium and low loads, so as to reduce the total through-flow capacity of the high-pressure cylinder, thereby greatly improving the main steam pressure, meanwhile, the high-pressure cylinder which continuously operates can also have higher cylinder efficiency, so that the high-pressure cylinder becomes a novel wide-load high-efficiency power generation steam turbine set;
one path of the hot reheat steam pipeline 52 is newly added and connected with the cut high-pressure cylinder 1, and the hot reheat steam pipeline is used for heating the cut high-pressure cylinder so as to be convenient for quick recovery and use. The cutting high-pressure cylinder 1 is connected with a condenser through a high-exhaust vent valve 9 and used for exhausting steam and blast friction heat in the cutting high-pressure cylinder to the condenser 7 through vacuum suction.
In fig. 1 the high pressure cylinder is divided into two cylinders, arranged coaxially opposite to each other, to balance the axial thrust. When the load is high, the main steam respectively enters the two high-pressure cylinders to do work simultaneously, and the exhaust steam is converged and then enters the boiler to be reheated. All 2 high-pressure cylinders have one path of steam extraction and enter a high-pressure heater after being gathered.
After the arrangement scheme is adopted, the steam inlet mode of the high-pressure cylinder is changed, so that the efficiency of the high-pressure cylinder and the main steam pressure are changed, and the circulation efficiency can be improved from two aspects of the efficiency and the initial parameter of the high-pressure cylinder. This solution has little effect on the intermediate and low pressure cylinders and little effect on boiler efficiency. Under the medium and low load, the power consumption of the water feeding pump is increased due to the increase of the main steam pressure, the small steam consumption is increased, the cycle efficiency is greatly improved due to the increase of initial parameters, and in addition, the water feeding temperature is increased under the medium and low load, so that the heat regeneration effect is improved, and the heat consumption rate is obviously reduced on the whole.
In consideration of the peak regulation requirement of the unit, the high-pressure cylinders can be put into use and cut off for several times in one day, two high-pressure cylinders are coaxially arranged for avoiding frequent flushing, the high-pressure cylinders still maintain the rated rotating speed of 3000rpm after cutting off, the high-exhaust ventilation valve needs to be opened to take away blast friction heating, in addition, heat is introduced in an appropriate amount according to the change condition of the cylinder temperature and then steam is heated, so that a certain cylinder temperature is maintained, and the high-pressure cylinder is convenient to rapidly enter steam and carry load.
Adopt high-pressure cylinder to divide behind the jar design for the blade of two high-pressure cylinders shortens, increases the tip loss, may influence high-pressure cylinder efficiency, can be close as far as possible to adopt the efficiency value when individual high-pressure cylinder through optimal design.
The scheme of the high-pressure cylinder split cylinder arrangement is also completely suitable for a supercritical (super) critical secondary reheating unit, the ultrahigh-pressure cylinders are divided into 2 cylinders at the time, and other changes are similar.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Taking an ultra (supercritical) 1000MW single reheating unit as an example, a steam turbine adopts a throttling steam distribution mode, a high-pressure regulating valve is operated in a full-opening sliding pressure mode, and the main steam pressure is lower under medium and low loads, so that the economic efficiency of the unit is influenced. The high-pressure cylinders of the original 1000MW unit are divided into 2 high-pressure cylinders which are respectively corresponding to the original 660MW unit and the original 350MW unit, and the work and the current capacity of the 2 high-pressure cylinders are basically set according to the relation of 2:1 in consideration of the setting series of the high-pressure cylinder building blocks and the peak load regulation requirement of the unit. Adopt the mode that 2 high-pressure cylinders entered simultaneously above 660MW load like this, the little high-pressure cylinder of excision below 660MW load only remains 1 big high-pressure cylinder operation to realize improving main steam pressure under the prerequisite that does not reduce high-pressure cylinder efficiency, thereby improve circulation efficiency. In this way, the typical profile of the heat rate of the turbine is as follows
FIG. 2 shows "virtual heat rate". Preliminary analysis shows that the heat consumption rate is reduced by about 3.8% at a 50% load, so that the power supply coal consumption rate of a unit is reduced by about 10g/kW.h, and the energy-saving effect is very obvious.
After the high-pressure cylinder adopts a coaxial cylinder arrangement mode, the loaded and peak-shaving operation process is as follows:
1. the machine set adopts a high and medium pressure cylinder combined starting mode to realize impact rotation and loaded operation till rated load;
2. after the unit has the peak regulation capacity, two high-pressure cylinders are kept to operate simultaneously in a region above 660MW load;
3. when the load is lower than 660MW and the low-load area is operated for a long time, the cutting operation is started, the steam inlet regulating valve of the small high-pressure cylinder is slowly closed, and the steam inlet quantity of the high-pressure cylinder is gradually transferred until the small high-pressure cylinder is completely cut off;
4. after cutting off the small high-pressure cylinder, maintaining the rated rotating speed, and opening the high-exhaust ventilation valve to take away blast friction heat;
5. when the small high-pressure cylinder operates in a region below 660MW load, the small high-pressure cylinder is always in a cut-off state, and proper amount of reheat steam is introduced for heating the cylinder according to the temperature change condition of the cylinder so as to maintain the proper temperature of the cut-off high-pressure cylinder and facilitate quick steam admission with load;
6. when the load is ready to rise to exceed 660MW, gradually opening an air inlet regulating valve of the small high-pressure cylinder to enable the small high-pressure cylinder to enter a working state again, and then synchronously participating in variable load regulation;
by means of the cylinder-separating design and the operation control, the steam turbine set can run economically in a wide load area.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A high-efficiency wide-load steam turbine set with coaxially arranged high-pressure cylinders is connected with a boiler, a heater and a condenser respectively, and comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are connected in sequence, wherein the high-pressure cylinder is connected with a main steam pipeline of the boiler, a cold and reheat steam pipeline of the boiler and the heater respectively;
when the load is higher than a set threshold value, the two high-pressure cylinders simultaneously perform steam inlet work, and when the load is lower than the set threshold value, the cut-off high-pressure cylinder is cut off, but the cut-off high-pressure cylinder still maintains the rated rotating speed.
2. The wide-load high-efficiency steam turbine set with high-pressure cylinders coaxially arranged in a cylinder division manner according to claim 1, wherein a main steam pipeline of the boiler is respectively connected with a cut-off high-pressure cylinder and a reserved high-pressure cylinder through respective valves, when the load is higher than a set threshold value, main steam respectively enters the two high-pressure cylinders to do work simultaneously, and after being collected, the main steam enters the boiler to be reheated.
3. The wide-load high-efficiency steam turbine unit with the high-pressure cylinders coaxially arranged in the cylinder division manner according to claim 1, wherein the cut-off high-pressure cylinder and the reserved high-pressure cylinder are coaxially arranged in opposite directions and are used for balancing axial thrust.
4. The wide-load high-efficiency steam turbine unit with the high-pressure cylinders coaxially arranged in the split cylinder mode according to claim 1, wherein one of the cut high-pressure cylinder and the reserved high-pressure cylinder has a steam extraction path, and the steam extraction paths are collected and then enter a heater.
5. The wide-load high-efficiency steam turbine set with the high-pressure cylinders coaxially arranged in the cylinder division manner according to claim 1, wherein a hot reheat steam pipeline is added to the boiler, and the hot reheat steam pipeline is connected with the cut high-pressure cylinders and used for heating the cut high-pressure cylinders so as to be used for rapid recovery.
6. The wide-load high-efficiency steam turbine unit with the high-pressure cylinders arranged coaxially in the cylinder division manner according to claim 1, wherein the high-pressure cutting cylinder is connected with a condenser through a high-exhaust ventilation valve and used for exhausting steam and blast friction heat in the high-pressure cutting cylinder to the condenser through vacuum suction.
7. The wide-load high-efficiency steam turbine unit with the high-pressure cylinders coaxially arranged in the cylinder division manner according to claim 6, wherein the high-pressure cylinders after being cut off are maintained at a rated rotating speed of 3000rpm, a high-exhaust ventilation valve is opened to take away blast friction heating, and in addition, heat is introduced in an appropriate amount according to the change condition of the cylinder temperature and then steam is heated to maintain a certain cylinder temperature, so that rapid steam inlet and load carrying are facilitated.
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| CN201811189661.8A CN111042880B (en) | 2018-10-12 | 2018-10-12 | Wide-load efficient turbine unit with high-pressure cylinders coaxially distributed in separate cylinders |
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| CN201811189661.8A CN111042880B (en) | 2018-10-12 | 2018-10-12 | Wide-load efficient turbine unit with high-pressure cylinders coaxially distributed in separate cylinders |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1268753A1 (en) * | 1985-06-17 | 1986-11-07 | Воронежский Политехнический Институт | Thermal power plant |
| CN105673101A (en) * | 2016-01-07 | 2016-06-15 | 山西漳泽电力股份有限公司电力技术研究中心 | Turbine with deep peak regulation function and thermodynamic system |
| CN107246286A (en) * | 2017-07-03 | 2017-10-13 | 上海汽轮机厂有限公司 | A kind of single reheat steam turbine of parallel high voltage cylinder |
| CN107339128A (en) * | 2017-07-03 | 2017-11-10 | 上海汽轮机厂有限公司 | A kind of Double reheat steam turbine of ultra-high pressure cylinder in parallel |
-
2018
- 2018-10-12 CN CN201811189661.8A patent/CN111042880B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1268753A1 (en) * | 1985-06-17 | 1986-11-07 | Воронежский Политехнический Институт | Thermal power plant |
| CN105673101A (en) * | 2016-01-07 | 2016-06-15 | 山西漳泽电力股份有限公司电力技术研究中心 | Turbine with deep peak regulation function and thermodynamic system |
| CN107246286A (en) * | 2017-07-03 | 2017-10-13 | 上海汽轮机厂有限公司 | A kind of single reheat steam turbine of parallel high voltage cylinder |
| CN107339128A (en) * | 2017-07-03 | 2017-11-10 | 上海汽轮机厂有限公司 | A kind of Double reheat steam turbine of ultra-high pressure cylinder in parallel |
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