CN112228164A - Steam turbine generator system - Google Patents
Steam turbine generator system Download PDFInfo
- Publication number
- CN112228164A CN112228164A CN202010914032.8A CN202010914032A CN112228164A CN 112228164 A CN112228164 A CN 112228164A CN 202010914032 A CN202010914032 A CN 202010914032A CN 112228164 A CN112228164 A CN 112228164A
- Authority
- CN
- China
- Prior art keywords
- pressure cylinder
- steam
- load
- generator
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
Abstract
The embodiment of the specification discloses a steam turbine generator system of a thermal power generating unit, which comprises a high-pressure cylinder, at least one first intermediate-pressure cylinder, at least one second intermediate-pressure cylinder, at least one first low-pressure cylinder, at least one second low-pressure cylinder, a first generator and a second generator, wherein the high-pressure cylinder, the at least one first intermediate-pressure cylinder, the first low-pressure cylinder and the first generator are sequentially arranged on a first shaft to form a first shaft system; the high-pressure cylinder receives the steam output by the boiler and is divided into two paths to be input into the first intermediate pressure cylinder and the second intermediate pressure cylinder respectively so as to divide the steam into first steam and second steam; the first intermediate pressure cylinder inputs the received first steam to the first low pressure cylinder, and the second intermediate pressure cylinder inputs the received second steam to the second low pressure cylinder; the first generator and the second generator provide loads according to the preset load proportion corresponding to the shafting and the steam. The embodiment of the specification can improve the deep peak regulation capacity and the operation economy of the thermal power generating unit.
Description
Technical Field
The present description relates to the field of thermal power generation, and in particular, to a steam turbine generator system.
Background
With the Chinese economy stepping into a new normal state, the total energy consumption and the intensity are controlled, the energy consumption enters a low-speed increasing period, meanwhile, the energy supply faces the development trend of long-term low-carbon cleanness, the energy structure is continuously optimized, the consumption proportion of clean energy is gradually improved, thermal power is extruded, and the utilization hours of a thermal power unit are kept at a low level for a long time.
In addition, the thermal power generating units, particularly the million units, participate in peak shaving and long-term low-load operation and become a normal state in the future. At present, the deep peak regulation capacity of a thermal power generating unit is weak, and the lowest operable load capacity of the unit is limited. And the coal consumption of the thermal power generating unit is obviously increased due to long-term low-load operation of the thermal power generating unit, and compared with a newly-built 1000MW unit, the coal consumption of power supply under 50% of load is increased by about 20g/kWh compared with 100% of load, namely the maximum operable load on the design of the thermal power generating unit. Therefore, when the thermal power generating unit operates under low load for a long time, the operating cost of the thermal power generating unit is greatly influenced, and the operating economy of the thermal power generating unit under low load is reduced.
Therefore, how to improve the deep peak regulation capability of the thermal power unit and improve the low-load operation efficiency of the thermal power unit becomes a serious problem facing thermal power enterprises at present.
Disclosure of Invention
The embodiment of the specification provides a steam turbine generator system to solve the problems of low deep peak regulation capacity and low-load operation economy of the existing thermal power unit.
In order to solve the above technical problem, the present specification is implemented as follows:
in a first aspect, the embodiments of the present specification provide a steam turbine generator system of a thermal power generating unit, including a high-pressure cylinder, at least one first intermediate-pressure cylinder, at least one second intermediate-pressure cylinder, at least one first low-pressure cylinder, at least one second low-pressure cylinder, a first generator, and a second generator,
the high-pressure cylinder, the at least one first intermediate-pressure cylinder, the at least one first low-pressure cylinder and the first generator are sequentially arranged on a first shaft to form a first shaft system;
the at least one second intermediate pressure cylinder, the at least one second low pressure cylinder and the second generator are sequentially mounted on a second shaft to form a second shaft system, wherein,
the high-pressure cylinder receives steam output by a boiler, and the steam is divided into two paths which are respectively input to the first intermediate pressure cylinder and the second intermediate pressure cylinder so as to divide the steam into first steam and second steam;
the first intermediate pressure cylinder inputs the received first steam to the first low pressure cylinder, and the second intermediate pressure cylinder inputs the received second steam to the second low pressure cylinder;
the first generator provides load according to a first preset load proportion corresponding to the first shaft system and the first steam, and the second generator provides load according to a second preset load proportion corresponding to the second shaft system and the second steam.
Optionally, the first load proportion and the second load proportion are determined according to load proportions of a high pressure cylinder, an intermediate pressure cylinder and a low pressure cylinder included in the turbine generator system.
Optionally, the first shaft system shares the total load of the thermal power generating unit according to the first preset load proportion and the second shaft system shares the total load of the thermal power generating unit according to the second preset load proportion.
Optionally, when the total load of the thermal power unit during operation is reduced and the ratio of the total load of the operation to the maximum operation load of the thermal power unit is smaller than the first preset load proportion, the first shaft system is used for bearing the total load of the thermal power unit during operation according to the first preset load proportion.
Optionally, under the condition that the thermal power generating unit operates at a low load, the first preset load proportion is smaller than the second preset load proportion; and/or
And when the thermal power generating unit operates at a high load, the first preset load proportion is larger than the second preset load proportion.
Optionally, the system further comprises:
at least one third intermediate pressure cylinder, at least one third low pressure cylinder and a third generator,
the at least one third intermediate pressure cylinder, the at least one third low pressure cylinder and the third generator are sequentially mounted on a third shaft to form a third shaft system, wherein,
the high-pressure cylinder divides the steam output by the boiler into three paths, and the three paths of steam are respectively input into the first intermediate pressure cylinder, the second intermediate pressure cylinder and the third intermediate pressure cylinder so as to divide the steam into first steam, second steam and third steam;
the first intermediate pressure cylinder inputs the received first steam to the first low pressure cylinder, the second intermediate pressure cylinder inputs the received second steam to the second low pressure cylinder, and the third intermediate pressure cylinder inputs the received third steam to the third low pressure cylinder;
the first generator provides load according to a first preset load proportion corresponding to the first axis and the first steam, the second generator provides load according to a second preset load proportion corresponding to the second axis and the second steam, and the third generator provides load according to a third preset load proportion corresponding to the third axis and the third steam.
Optionally, a shunt valve is arranged on a pipeline for transmitting the steam between the high-pressure cylinder and the first and second intermediate-pressure cylinders, so as to divide the steam into two paths.
Optionally, the intermediate pressure cylinder includes a single split intermediate pressure cylinder or a double split intermediate pressure cylinder; and/or the low pressure cylinder comprises a single-split low pressure cylinder or a double-split low pressure cylinder.
In a second aspect, the present specification provides a steam turbine generator system of a thermal power generating unit, including a high pressure cylinder, an intermediate pressure cylinder, at least one first low pressure cylinder, at least one second low pressure cylinder, a first generator and a second generator,
the high pressure cylinder, the intermediate pressure cylinder, the at least one first low pressure cylinder and the first generator are sequentially arranged on a first shaft to form a first shaft system;
the at least one second low pressure cylinder and the second generator are sequentially mounted on a second shaft to form a second shaft system, wherein,
the high-pressure cylinder receives steam output by a boiler and inputs the steam to the intermediate pressure cylinder;
the intermediate pressure cylinder receives the steam output by the high pressure cylinder, and the steam is divided into two paths to be input to the first low pressure cylinder and the second low pressure cylinder respectively so as to divide the steam into first steam and second steam, wherein the first steam is input to the first low pressure cylinder, and the second steam is input to the second low pressure cylinder;
the first generator provides load according to a first preset load proportion corresponding to the first shaft system and the first steam, and the second generator provides load according to a second preset load proportion corresponding to the second shaft system and the second steam.
Optionally, the system further comprises:
at least one third low pressure cylinder and a third generator,
said at least one third low pressure cylinder and said third generator being mounted in sequence on a third shaft, constituting a third shaft system, wherein,
the intermediate pressure cylinder divides the steam output by the high pressure cylinder into three paths, and the three paths of steam are respectively input into the first low pressure cylinder, the second low pressure cylinder and the third low pressure cylinder;
the first generator provides load according to a first load proportion corresponding to the first shaft system and the first steam, the second generator provides load according to a second load proportion corresponding to the second shaft system and the second steam, and the third generator provides load according to a third load proportion corresponding to the third shaft system and the third steam.
The embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects: the high-pressure cylinder, the middle-pressure cylinder and the low-pressure cylinder form two corresponding shafting, and the loads required by the thermal power generating unit are provided together according to the corresponding preset load proportion of each shafting. When the branch steam turbine units of the 2 shafting which are connected in parallel exist in the steam turbine generator system, the low-load operation can be realized by opening all the branch steam turbines of the first shafting and the second shafting or closing the operation mode of the branch steam turbines of the second shafting instead of reducing the whole steam discharge of the unit, so that the improvement of the operation efficiency of the thermal power unit under the low load can be realized, and the minimum operation load of the thermal power unit is reduced.
Therefore, the turbonator system has great advantages in the aspects of the peak shaving depth of the unit and the unit economy under low load compared with the traditional unit, and can remarkably improve the deep peak shaving capacity of the thermal power unit and the low-load operation efficiency of the thermal power unit.
Drawings
The accompanying drawings, which are included to provide a further understanding of the specification and are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description serve to explain the specification and not to limit the specification in a non-limiting sense. In the drawings:
fig. 1 is a schematic structural diagram of a steam turbine generator system of a thermal power generating unit according to a first embodiment of the present specification.
Fig. 2 is a schematic structural diagram of a steam turbine generator system of a thermal power generating unit according to a second embodiment of the present specification.
Fig. 3 is a schematic structural diagram of a steam turbine generator system of a thermal power generating unit according to a third embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of a steam turbine generator system of a thermal power generating unit according to a fourth embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more clear, the technical solutions of the present disclosure will be clearly and completely described below with reference to the specific embodiments of the present disclosure and the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification without any creative effort belong to the protection scope of the present specification.
The technical solutions provided by the embodiments of the present description are described in detail below with reference to the accompanying drawings.
In order to solve the problems existing in the prior art, the embodiment of the specification provides a steam turbine generator system of a thermal power generating unit. The turbine generator system of the thermal power generating unit comprises a high-pressure cylinder, at least one first intermediate-pressure cylinder, at least one second intermediate-pressure cylinder, at least one first low-pressure cylinder, at least one second low-pressure cylinder, a first generator and a second generator, wherein the high-pressure cylinder, the at least one first intermediate-pressure cylinder, the at least one first low-pressure cylinder and the first generator are sequentially arranged on a first shaft to form a first shaft system; the at least one second intermediate pressure cylinder, the at least one second low pressure cylinder and the second generator are sequentially arranged on the second shaft to form a second shaft system.
The number of the intermediate pressure cylinder and the low pressure cylinder may be at least one, and the intermediate pressure cylinder includes a single split intermediate pressure cylinder or a double split intermediate pressure cylinder. The low pressure cylinder comprises a single-split low pressure cylinder or a double-split low pressure cylinder. Two double split flow intermediate pressure jar can constitute two double split flow form intermediate pressure jar, and two double split flow low pressure jar can constitute two double split flow form low pressure jar.
The high-pressure cylinder receives steam output by the boiler, and divides the exhaust steam of the steam into two paths which are respectively input into the first intermediate pressure cylinder and the second intermediate pressure cylinder so as to divide the steam into first steam and second steam. The first intermediate pressure cylinder receives the first steam, the exhaust steam of the first steam is input to the first low pressure cylinder, the second intermediate pressure cylinder receives the second steam, and the exhaust steam of the second steam is input to the second low pressure cylinder.
Optionally, a shunt valve is arranged on a pipeline for transmitting the steam between the high-pressure cylinder and the first and second intermediate-pressure cylinders, so as to divide the steam into two paths. One path of steam can be closed by closing the valve, so that the steam cannot enter the corresponding middle-pressure cylinder and the corresponding low-pressure cylinder to do work, and load is generated and provided for the thermal power generating unit.
The first generator provides load according to a first preset load proportion corresponding to the first axis and the first steam, and the second generator provides load according to a second preset load proportion corresponding to the second axis and the second steam. According to the load condition required by the thermal power generating unit, the shafting comprising the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder cannot be closed, the shafting comprising no high-pressure cylinder and only the intermediate-pressure cylinder and the low-pressure cylinder can be used for closing the shunt valve, so that steam output by the high-pressure cylinder cannot enter the closed shafting, and therefore the shafting cannot generate corresponding load in a preset proportion.
The first load proportion and the second load proportion may be determined according to load proportions of a high pressure cylinder, an intermediate pressure cylinder and a low pressure cylinder included in the turbine generator system, and the intermediate pressure cylinder is generally relatively large in load, but the present specification is not limited thereto. In the embodiment of the present specification, the high-pressure cylinder occupies a load proportion in the turbonator system, but does not participate in load adjustment of each shafting. The power distribution proportion of the first shaft system and the second shaft system can be adjusted by adjusting the through-flow sizes of the medium pressure cylinder and the low pressure cylinder which are included by the corresponding shaft system according to design requirements.
Taking the same through-flow size of the intermediate pressure cylinder and the low pressure cylinder as an example, if the ratio of the high, intermediate and low pressure rigid loads is 3:4:3, and if the turbonator system comprises two shafting consisting of the intermediate and low pressure cylinders, the ratio of the intermediate and low pressure rigid loads is divided into 2 parts, one shafting bears the load of (3+2+1.5)/10, namely 65%, of the thermal power generating unit, and the other shafting bears the load of (2+1.5)/10, namely 35%. Namely, each shafting shares the total load of the thermal power generating unit according to the preset load proportion.
The steam turbine generator system may include two or more shafting systems, and as described above, a shafting system that does not include high pressure cylinders may stop providing load to the live power train by closing the diverter valve. Optionally, when the total operating load of the thermal power generating unit is reduced and the ratio of the total operating load to the maximum operating load of the thermal power generating unit is smaller than a first preset load proportion corresponding to a first axis system including the high-pressure cylinder, the first axis system all bears the total operating load of the thermal power generating unit according to the first preset load proportion.
The method comprises the following steps that a steam turbine generator system is divided into two working modes according to the load of a thermal power unit, when the load required by the thermal power unit is higher, for example, the load is larger than a first preset load proportion corresponding to a first shaft system, and the first shaft system is used for bearing the total load of the thermal power unit in operation according to the first preset load proportion. When the load of the thermal power generating unit is reduced, for example, the long-term operation is smaller than a first preset load proportion corresponding to the first shaft system, the steam shunt valve entering the second shaft system is closed, and the first shaft system only bears the total load of the thermal power generating unit in operation according to the first preset load proportion. At the moment, under the condition that the load output generated by the thermal power generating unit according to the first preset load proportion is maintained, the coal consumption level of the thermal power generating unit is consistent with the maximum operation load of the thermal power generating unit, namely the coal consumption level of the load output generated according to the 100% load proportion.
For example, when the maximum designed load capacity of the thermal power generating unit is 100 ten thousand kilowatts, and the first shaft system bears 65% of the load, and the second shaft system bears 35% of the load, if the thermal power generating unit runs at full load, the first shaft system provides 65 ten thousand kilowatts, and the second shaft system provides 35 ten thousand kilowatts. If the thermal power generating unit needs to operate at 65% of load, namely 65 ten thousand kilowatts, the second shaft system is closed, the first shaft system provides load, at the moment, according to the load proportion, the full-load operation of the first shaft system can provide 65 ten thousand kilowatts to the maximum extent, so that the first shaft system can still operate at full load when the thermal power generating unit needs 65% of low load, the working condition of the first shaft system cannot be changed, the main steam quantity of the boiler caused by low load reduction can all enter the first shaft system, the through flow quantity of the first shaft system is not changed, the corresponding required coal consumption level of the thermal power generating unit is close to 100% of load, and the power supply economy under low load of the thermal power generating unit is greatly improved.
Likewise, in the case where the turbonator system includes 3 shafting, the load proportion of the corresponding medium and low pressure cylinders needs to be divided into 3 parts. And 3 shafting provide the load to the live-wire generator group according to corresponding preset load proportion.
The following description will discuss a turbine generator system structure of a thermal power generating unit according to an embodiment.
Referring to fig. 1, which is a schematic structural diagram of a steam turbine generator system of a thermal power generating unit according to a first embodiment of this specification, as shown in fig. 1, in this embodiment, the steam turbine generator system of the thermal power generating unit includes one high-pressure cylinder (TH), two intermediate-pressure cylinders (TM1, TM2), four low-pressure cylinders (TL1, TL2, TL3, TL4), and an extraction heating system, where the extraction heating system includes a low-pressure heater 102, a feed water pump 104, and a high-pressure heater 106.
As shown in the figure, the shaft system of the turbonator system is divided into two, namely a shaft system 1 connected with a generator 1 and a shaft system 2 connected with a generator 2. The shafting 1 comprises a high pressure cylinder, a middle pressure cylinder and two low pressure cylinders (TH, TM1, TL1 and TL 2); the shafting 2 includes a middle pressure cylinder and two low pressure cylinders (TM2, TL3, TL4), and the black bold lines in the figure indicate the shafts on which the high, middle and low pressure cylinders are mounted, for example, rigid shafts. The intermediate pressure cylinder can adopt a single-split or double-split mode, and the low pressure cylinder can also adopt a single-split or double-split mode. In the embodiment shown in fig. 1, each shafting includes one single-split intermediate pressure cylinder and two double-split low pressure cylinders.
The power distribution proportion of the shafting 1 and 2 can be adjusted by adjusting the TM1, TL1, TL2, TM2, TL3 and TL4 through-flow sizes according to design requirements, the TM1, the TM2, the TL1, the TL2, the TL3 and the TL4 are the same as each other, the shafting 1 bears 65% of load of the unit and the shafting 2 bears 35% of load of the unit according to the estimation of the ratio of high, medium and low pressure rigid load of 3:4: 3.
For example, when the load of the train is high and greater than 65% of the load, the main steam output from the boiler 108 enters the reheater 112 to be heated after entering the high pressure cylinder TH to do work. The heated steam is divided into two paths, wherein one path enters the medium pressure cylinder TM1, then enters the low pressure cylinders TL1 and TL2 to do work, and then enters the condenser 132; the other path enters an intermediate pressure cylinder TM2 through a shunt valve 114, then enters low pressure cylinders TL3 and TL4 to do work, and then enters a condenser 134.
For example, when the load of the train is reduced and the long-term operation is less than 65% of the load, the steam shunt valve 114 entering the intermediate pressure cylinder TM2 can be closed, and the high-temperature steam at the outlet of the reheater 112 enters only the intermediate and low pressure cylinders in the shafting 1 to do work. At the moment, under the condition of maintaining 65% load output of the thermal power generating unit, the coal consumption level of the unit is consistent with 100% load.
In order to solve the problems in the prior art, an embodiment of the present specification further provides a steam turbine generator system of a thermal power generating unit, as shown in fig. 2. Fig. 2 is a schematic structural diagram of a steam turbine generator system of a thermal power generating unit according to a second embodiment of the present specification.
The difference between the steam turbine generator system of the thermal power generating unit in the embodiment of fig. 1 is that in this embodiment, each shafting of the steam turbine generator system comprises two double split flow intermediate pressure cylinders (TM1-1, TM1-2), (TM2-1, TM 2-2).
In order to more accurately and effectively adjust the output load of the steam turbine generator system according to the load requirement of the thermal power system, optionally, the steam turbine generator system of the thermal power unit may further include at least one third intermediate pressure cylinder, at least one third low pressure cylinder, and a third generator, where the at least one third intermediate pressure cylinder, the at least one third low pressure cylinder, and the third generator are sequentially mounted on a third shaft to form a third shaft system, where the high pressure cylinder divides steam output by a boiler into three paths, and inputs exhaust steam of the steam into the first intermediate pressure cylinder, the second intermediate pressure cylinder, and the third intermediate pressure cylinder, respectively, so as to divide the steam into first steam, second steam, and third steam; the first intermediate pressure cylinder receives first steam, exhaust steam of the first steam is input into the first low pressure cylinder, the second intermediate pressure cylinder receives second steam, exhaust steam of the second steam is input into the second low pressure cylinder, the third intermediate pressure cylinder receives third steam, and exhaust steam of the third steam is input into the third low pressure cylinder; the first generator provides load according to a first preset load proportion corresponding to the first axis and the first steam, the second generator provides load according to a second preset load proportion corresponding to the second axis and the second steam, and the third generator provides load according to a third preset load proportion corresponding to the third axis and the third steam.
That is to say, the turbonator system includes three shaftings, can close according to the actual load requirement of thermal power unit, and the second shafting and/or the third shafting that get into except first shafting. For example, when the load requirement is high, the three shafting all provide the load according to the corresponding preset load proportion; when the load requirement is medium, closing a shafting which is not the first shafting; when the load requirement is relatively low, two shafting which are not the first shafting are closed, and the load required by the thermal power generating unit is provided only by the first shafting according to a first preset load proportion.
In addition, the embodiment of the present specification further provides a steam turbine generator system of a thermal power generating unit, as shown in fig. 3. Fig. 3 is a schematic structural diagram of a steam turbine generator system of a thermal power generating unit according to a third embodiment of the present disclosure.
The difference from the steam turbine generator system of the thermal power generating unit in the embodiment of fig. 1 is that in this embodiment, the steam turbine generator system includes three shafting, in addition to shafting 1 and shafting 2, shafting 3 connected with the generator 3, where the shafting 3 includes two double split flow intermediate pressure cylinders (TM3-1 and TM3-2) and two double split flow low pressure cylinders (TL5 and TL 6).
The steam coming out of the reheater 112 is divided into three paths through the shunt valves 114 and 114', wherein one path enters the intermediate pressure cylinders TM1-1 and TM1-2, then enters the low pressure cylinders TL1 and TL2 to do work, and then enters the condenser 132; the other path of the power is fed into medium pressure cylinders TM2-1 and TM2-2 after passing through a shunt valve 114, then fed into low pressure cylinders TL3 and TL4 to do work, and then fed into a condenser 134; the third path enters the medium pressure cylinders TM3-1 and TM3-2 after passing through the shunt valve 114', then enters the low pressure cylinders TL5 and TL6 for doing work, and then enters the condenser 146.
According to the requirement of the load of the thermal power generating unit, the shunt valves 114 and 114 ' can be fully opened, full load is provided by three shafting, or the shunt valves 114 and 114 ' are closed, low load is provided by the shafting 1 only, or the shunt valves 114 or 114 ' are closed, and accordingly preset load is provided by the shafting 1 and the shafting 3 or the shafting 1 and the shafting 2.
In order to solve the problems in the prior art, an embodiment of the present specification further provides a steam turbine generator system of a thermal power generating unit, and in this embodiment, load adjustment of the thermal power generating unit is mainly achieved by shaft system steam splitting formed by low-pressure cylinders.
Optionally, the steam turbine generator system of the thermal power generating unit includes a high-pressure cylinder, an intermediate-pressure cylinder, at least one first low-pressure cylinder, at least one second low-pressure cylinder, a first generator, and a second generator, where the high-pressure cylinder, the intermediate-pressure cylinder, the at least one first low-pressure cylinder, and the first generator are sequentially mounted on a first shaft to form a first shaft system; the at least one second low-pressure cylinder and the second generator are sequentially arranged on a second shaft to form a second shaft system, wherein the high-pressure cylinder receives steam output by the boiler and inputs the steam to the intermediate-pressure cylinder;
the intermediate pressure cylinder receives the steam output by the high pressure cylinder, and divides the exhaust steam of the steam into two paths which are respectively input to the first low pressure cylinder and the second low pressure cylinder so as to divide the steam into first steam and second steam, wherein the first steam is input to the first low pressure cylinder, and the second steam is input to the second low pressure cylinder;
the first generator provides load according to a first preset load proportion corresponding to the first shaft system and the first steam, and the second generator provides load according to a second preset load proportion corresponding to the second shaft system and the second steam.
The specific working principle can refer to the embodiment of fig. 4, and fig. 4 is a schematic structural diagram of a steam turbine generator system of a thermal power generating unit according to a fourth embodiment of this specification.
Compared to the steam turbine generator system of the embodiment of fig. 1, in this embodiment, the bypass valve 114 ″ included in the steam turbine generator system is disposed between the intermediate pressure cylinder (TM1-1, TM1-2) and the low pressure cylinder (TL1, TL2), and the load provided by the steam turbine generator system is adjusted by opening and closing the steam bypass valve into the low pressure cylinder.
The steam from the reheater 112 firstly enters the intermediate pressure cylinders TM1-1 and TM1-2, then is divided into two paths, wherein one path enters the low pressure cylinders TL1 and TL2 to do work, and then enters the condenser 132; the other path of the flow passes through a shunt valve 114' and then enters low-pressure cylinders TL3 and TL4 to do work, and then enters a condenser 134.
Optionally, the steam turbine generator system in the embodiment of fig. 4 may also be divided into three shafting systems, and further includes: at least one third low pressure cylinder (not shown in the figure) and a third generator (not shown in the figure), wherein the at least one third low pressure cylinder and the third generator are sequentially mounted on a third shaft to form a third shaft system, and the intermediate pressure cylinder divides the steam output by the high pressure cylinder into three paths and inputs the three paths of steam into the first low pressure cylinder, the second low pressure cylinder and the third low pressure cylinder respectively; the first generator provides load according to a first load proportion corresponding to the first shaft system and the first steam, the second generator provides load according to a second load proportion corresponding to the second shaft system and the second steam, and the third generator provides load according to a third load proportion corresponding to the third shaft system and the third steam.
The turbogenerator system disclosed in the embodiment of the specification is mainly characterized in that a main turbine of a steam turbine has a branch turboset with 2 shafting, 3 shafting or more shafting connected in parallel, and low-load operation is realized by closing the operation mode of the branch steam turbine instead of reducing the whole steam discharge of the turboset, so that the operation efficiency of the thermal power unit under low load can be improved, and meanwhile, the minimum operation load of the thermal power unit is reduced.
Therefore, the turbonator system has great advantages in the aspects of the peak shaving depth of the unit and the unit economy under low load compared with the traditional unit, and can remarkably improve the deep peak shaving capacity of the thermal power unit and the low-load operation efficiency of the thermal power unit.
In the following, a turbine generator system includes a first shaft system and a second shaft system, and the first shaft system bears the load of the thermal power generating unit according to a proportion of 65%, and the second shaft system bears the load of the thermal power generating unit according to a proportion of 35%, for example, the following description is made:
(1) the thermal power generating unit has 65% load and the following units with high operation efficiency
When the unit operates at 65% load, the coal consumption level of the unit is similar to 100% load;
when the unit operates at 50% load, the coal consumption level of the unit is similar to 79% load;
when the unit operates at 40% load, the coal consumption level of the unit is similar to 61% load.
(2) Strengthening of low load operation capability of unit
Compared with the lowest operation load of 40% of the traditional million units, the steam turbine generator system provided by the embodiment can reduce the lowest operation load to 26%.
For the condition that the turbo generator system comprising the three shaftings comprises the first shafting and the second shafting, the first shafting bears the unit load according to the first preset proportion, the second shafting bears the unit load according to the second preset proportion, and the third shafting bears the unit load according to the third preset proportion, the turbo generator system has greater advantages in the unit economy under the unit peak shaving depth and the low load compared with the traditional unit, and the details are omitted here.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present specification, and is not intended to limit the present specification. Various modifications and alterations to this description will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present specification should be included in the scope of the claims of the present specification.
Claims (10)
1. A turbonator system of a thermal power generating unit is characterized by comprising a high-pressure cylinder, at least one first intermediate-pressure cylinder, at least one second intermediate-pressure cylinder, at least one first low-pressure cylinder, at least one second low-pressure cylinder, a first generator and a second generator,
the high-pressure cylinder, the at least one first intermediate-pressure cylinder, the at least one first low-pressure cylinder and the first generator are sequentially arranged on a first shaft to form a first shaft system;
the at least one second intermediate pressure cylinder, the at least one second low pressure cylinder and the second generator are sequentially mounted on a second shaft to form a second shaft system, wherein,
the high-pressure cylinder receives steam output by a boiler, and the steam is divided into two paths which are respectively input to the first intermediate pressure cylinder and the second intermediate pressure cylinder so as to divide the steam into first steam and second steam;
the first intermediate pressure cylinder inputs the received first steam to the first low pressure cylinder, and the second intermediate pressure cylinder inputs the received second steam to the second low pressure cylinder;
the first generator provides load according to a first preset load proportion corresponding to the first shaft system and the first steam, and the second generator provides load according to a second preset load proportion corresponding to the second shaft system and the second steam.
2. The system of claim 1, wherein the first load proportion and the second load proportion are determined according to load proportions of a high pressure cylinder, an intermediate pressure cylinder, and a low pressure cylinder included in the turbonator system.
3. The method according to claim 1, wherein the first shaft system shares the total load of the thermal power unit according to the first preset load proportion and the second shaft system shares the total load of the thermal power unit according to the second preset load proportion.
4. The system of claim 3,
and under the condition that the total load of the thermal power unit in operation is reduced and the ratio of the total load of the operation to the maximum operation load of the thermal power unit is smaller than the first preset load proportion, the first shaft system is used for bearing the total load of the thermal power unit in operation according to the first preset load proportion.
5. The system of claim 1,
when the thermal power generating unit operates under a low load condition, the first preset load proportion is smaller than the second preset load proportion; and/or
And when the thermal power generating unit operates at a high load, the first preset load proportion is larger than the second preset load proportion.
6. The system of claim 1, further comprising:
at least one third intermediate pressure cylinder, at least one third low pressure cylinder and a third generator,
the at least one third intermediate pressure cylinder, the at least one third low pressure cylinder and the third generator are sequentially mounted on a third shaft to form a third shaft system, wherein,
the high-pressure cylinder divides the steam output by the boiler into three paths, and the three paths of steam are respectively input into the first intermediate pressure cylinder, the second intermediate pressure cylinder and the third intermediate pressure cylinder so as to divide the steam into first steam, second steam and third steam;
the first intermediate pressure cylinder inputs the received first steam to the first low pressure cylinder, the second intermediate pressure cylinder inputs the received second steam to the second low pressure cylinder, and the third intermediate pressure cylinder inputs the received third steam to the third low pressure cylinder;
the first generator provides load according to a first preset load proportion corresponding to the first axis and the first steam, the second generator provides load according to a second preset load proportion corresponding to the second axis and the second steam, and the third generator provides load according to a third preset load proportion corresponding to the third axis and the third steam.
7. The system of claim 1, wherein a bypass valve is disposed on a conduit for transferring the steam between the high pressure cylinder and the first and second intermediate pressure cylinders to divide the steam into two paths.
8. The system of any one of claims 1-7, wherein the intermediate pressure cylinder comprises a single split intermediate pressure cylinder or a dual split intermediate pressure cylinder; and/or the low pressure cylinder comprises a single-split low pressure cylinder or a double-split low pressure cylinder.
9. A turbonator system of a thermal power generating unit is characterized by comprising a high-pressure cylinder, a middle-pressure cylinder, at least one first low-pressure cylinder, at least one second low-pressure cylinder, a first generator and a second generator,
the high pressure cylinder, the intermediate pressure cylinder, the at least one first low pressure cylinder and the first generator are sequentially arranged on a first shaft to form a first shaft system;
the at least one second low pressure cylinder and the second generator are sequentially mounted on a second shaft to form a second shaft system, wherein,
the high-pressure cylinder receives steam output by a boiler and inputs the steam to the intermediate pressure cylinder;
the intermediate pressure cylinder receives the steam output by the high pressure cylinder, and the steam is divided into two paths to be input to the first low pressure cylinder and the second low pressure cylinder respectively so as to divide the steam into first steam and second steam, wherein the first steam is input to the first low pressure cylinder, and the second steam is input to the second low pressure cylinder;
the first generator provides load according to a first preset load proportion corresponding to the first shaft system and the first steam, and the second generator provides load according to a second preset load proportion corresponding to the second shaft system and the second steam.
10. The system of claim 9, further comprising:
at least one third low pressure cylinder and a third generator,
said at least one third low pressure cylinder and said third generator being mounted in sequence on a third shaft, constituting a third shaft system, wherein,
the intermediate pressure cylinder divides the steam output by the high pressure cylinder into three paths, and the three paths of steam are respectively input into the first low pressure cylinder, the second low pressure cylinder and the third low pressure cylinder;
the first generator provides load according to a first load proportion corresponding to the first shaft system and the first steam, the second generator provides load according to a second load proportion corresponding to the second shaft system and the second steam, and the third generator provides load according to a third load proportion corresponding to the third shaft system and the third steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010914032.8A CN112228164A (en) | 2020-09-03 | 2020-09-03 | Steam turbine generator system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010914032.8A CN112228164A (en) | 2020-09-03 | 2020-09-03 | Steam turbine generator system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112228164A true CN112228164A (en) | 2021-01-15 |
Family
ID=74115840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010914032.8A Pending CN112228164A (en) | 2020-09-03 | 2020-09-03 | Steam turbine generator system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112228164A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060106A (en) * | 2021-12-23 | 2022-02-18 | 中电华创电力技术研究有限公司 | Double-shaft steam turbine system for deep flexible peak shaving |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH351980A (en) * | 1956-02-17 | 1961-02-15 | Vickers Electrical Co Ltd | Steam turbine plant |
| US4007597A (en) * | 1975-09-30 | 1977-02-15 | Westinghouse Electric Corporation | Power plant and system for accelerating a cross compound turbine in such plant, especially one having an HTGR steam supply |
| US5649416A (en) * | 1995-10-10 | 1997-07-22 | General Electric Company | Combined cycle power plant |
| JPH10266811A (en) * | 1997-03-27 | 1998-10-06 | Toshiba Corp | Cross compound type steam turbine generation plant |
| JP2000274209A (en) * | 1999-03-25 | 2000-10-03 | Mitsubishi Heavy Ind Ltd | Cross compound type twin shaft steam turbine |
| US20100213714A1 (en) * | 2007-04-27 | 2010-08-26 | Weizhong Feng | New System Turbine Generation Set |
| CN105697075A (en) * | 2016-03-09 | 2016-06-22 | 华北电力大学 | Extraction condensing heat supply system additionally provided with non-reheat medium-pressure steam turbine |
| CN205477780U (en) * | 2016-03-30 | 2016-08-17 | 西安交通大学 | A low pressure bypass turbine system for high load condition of large -scale steam turbine |
| 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 |
| CN109630221A (en) * | 2018-11-30 | 2019-04-16 | 东方电气集团东方汽轮机有限公司 | A kind of double reheat power generation sets system and method suitable for depth peak regulation |
| CN110159372A (en) * | 2019-06-26 | 2019-08-23 | 西安西热节能技术有限公司 | A kind of system and method for realizing vapour pneumoelectric trilogy supply |
| CN111042881A (en) * | 2018-10-12 | 2020-04-21 | 上海明华电力技术工程有限公司 | Wide-load high-efficiency steam turbine generator unit with part of cylinders capable of being cut off |
-
2020
- 2020-09-03 CN CN202010914032.8A patent/CN112228164A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH351980A (en) * | 1956-02-17 | 1961-02-15 | Vickers Electrical Co Ltd | Steam turbine plant |
| US4007597A (en) * | 1975-09-30 | 1977-02-15 | Westinghouse Electric Corporation | Power plant and system for accelerating a cross compound turbine in such plant, especially one having an HTGR steam supply |
| US5649416A (en) * | 1995-10-10 | 1997-07-22 | General Electric Company | Combined cycle power plant |
| JPH10266811A (en) * | 1997-03-27 | 1998-10-06 | Toshiba Corp | Cross compound type steam turbine generation plant |
| JP2000274209A (en) * | 1999-03-25 | 2000-10-03 | Mitsubishi Heavy Ind Ltd | Cross compound type twin shaft steam turbine |
| US20100213714A1 (en) * | 2007-04-27 | 2010-08-26 | Weizhong Feng | New System Turbine Generation Set |
| CN105697075A (en) * | 2016-03-09 | 2016-06-22 | 华北电力大学 | Extraction condensing heat supply system additionally provided with non-reheat medium-pressure steam turbine |
| CN205477780U (en) * | 2016-03-30 | 2016-08-17 | 西安交通大学 | A low pressure bypass turbine system for high load condition of large -scale steam turbine |
| 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 |
| CN111042881A (en) * | 2018-10-12 | 2020-04-21 | 上海明华电力技术工程有限公司 | Wide-load high-efficiency steam turbine generator unit with part of cylinders capable of being cut off |
| CN109630221A (en) * | 2018-11-30 | 2019-04-16 | 东方电气集团东方汽轮机有限公司 | A kind of double reheat power generation sets system and method suitable for depth peak regulation |
| CN110159372A (en) * | 2019-06-26 | 2019-08-23 | 西安西热节能技术有限公司 | A kind of system and method for realizing vapour pneumoelectric trilogy supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060106A (en) * | 2021-12-23 | 2022-02-18 | 中电华创电力技术研究有限公司 | Double-shaft steam turbine system for deep flexible peak shaving |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108757066B (en) | Thermal power generating unit regenerative heat storage system for load response and operation method | |
| CN108005741B (en) | Cogeneration system for improving heat supply safety of back condensation and back extraction and adjustment method | |
| CN109855147B (en) | Combined cycle device based on heat supply and power peak regulation coupling and operation method thereof | |
| CN113175362B (en) | Bus pipe connection system for realizing zero output of low-pressure cylinder and operation method | |
| CN109945268B (en) | Heating system of gas-steam combined cycle thermal power plant | |
| CN114233416B (en) | Dynamically-reconstructed steam turbine generator unit and operation method | |
| CN107559056B (en) | Steam turbine increasing system with AGC function and adjusting method | |
| CN109854315B (en) | Heating system for gas-steam combined cycle unit steam extraction integration and operation method thereof | |
| CN109854316B (en) | Combined cycle heat supply and power peak regulation coupling system based on energy cascade utilization and operation method thereof | |
| CN113669117A (en) | Steam turbine bypass coupling low-pressure cylinder zero-output heat supply system and method for improving operation flexibility of heat supply unit | |
| CN109869784B (en) | Combined cycle device for steam extraction integration and heat accumulation peak shaving coupling and operation method thereof | |
| CN210509309U (en) | Steam complementary energy utilization coupling steam extraction heat supply system for thermoelectric unit electric power peak regulation | |
| CN113175367B (en) | Master control system for improving peak regulation capacity and flexibility of unit and operation method | |
| CN114046186A (en) | High-flexibility high-thermoelectric-ratio composite thermal mass bypass heating system | |
| CN112228164A (en) | Steam turbine generator system | |
| CN113958942A (en) | Steam turbine heat regenerative system capable of realizing machine-furnace decoupling | |
| CN113175360A (en) | Bus pipe connection system for improving deep peak shaving low-pressure cylinder efficiency and operation method | |
| CN210179723U (en) | Combined cycle device based on heat supply and electric power peak regulation coupling | |
| CN210088955U (en) | Combined cycle device for steam extraction integration and heat storage peak regulation coupling | |
| CN213775467U (en) | Thermoelectric decoupling system with multiple hydraulic regulator valves | |
| CN109763869B (en) | Heat accumulation coupling steam extraction integrated system for cascade utilization of combined cycle energy and operation method thereof | |
| CN203907579U (en) | System for whole-course automatic control of drum water level of waste heat boiler of gas turbine | |
| CN111042879A (en) | Wide-load high-efficiency steam turbine set with high and medium pressure cylinders capable of being cut off in separate mode | |
| CN113638807B (en) | Heating system and method for bypass auxiliary cylinder cutting of gas-steam combined cycle unit | |
| CN113494321B (en) | High-pressure cylinder zero-output-force-based bus pipe connection system and operation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210115 |