CN114810225A - Multistage-section tandem type steam turbine system and using method thereof - Google Patents

Multistage-section tandem type steam turbine system and using method thereof Download PDF

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Publication number
CN114810225A
CN114810225A CN202210604672.8A CN202210604672A CN114810225A CN 114810225 A CN114810225 A CN 114810225A CN 202210604672 A CN202210604672 A CN 202210604672A CN 114810225 A CN114810225 A CN 114810225A
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steam
turbine
stage
multistage
exhaust
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Chinese (zh)
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高增珣
徐克鹏
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Full Dimension Power Technology Co ltd
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Full Dimension Power Technology Co ltd
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Priority to CN202210604672.8A priority Critical patent/CN114810225A/en
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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
    • 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
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • 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
    • 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
    • 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
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type

Abstract

The invention provides a multistage-section tandem type steam turbine system which comprises a steam inlet hot end, a multistage-section tandem type steam turbine, a steam exhaust cold end and a power output end. The steam inlet hot end provides high-parameter steam for the multistage-section tandem steam turbine, the multistage-section tandem steam turbine converts the high-parameter steam into low-parameter steam, and the steam exhaust cold end receives the low-parameter steam. The power output end is connected with the multistage-section serial-type steam turbine. The multistage-section serial-connection type steam turbine comprises a rotor and a plurality of turbine stages, the turbine stages are sequentially connected in series on the rotor, and each turbine stage is provided with a steam inlet and a steam outlet. The steam outlet of the preceding turbine stage is connected to the steam inlet of the following turbine stage in the steam expansion direction, so that the steam between the turbine stages flows through each other. The invention can make the enthalpy drop of each turbine stage meet the requirement of optimal speed ratio, and the multi-stage series steam turbine has higher working efficiency when the load changes.

Description

Multistage-section tandem type steam turbine system and using method thereof
Technical Field
The invention relates to the technical field of steam turbines, in particular to a multistage section tandem type steam turbine system capable of adjusting enthalpy drop distribution of each stage section according to unit load and a using method thereof.
Background
With the increasing year by year of the installed ratio of new energy power generation, more and more thermal power turbine units have to reduce the load operation, and the power grid is required to bear the peak shaving function, so that the unit load changes frequently. The steam turbine for power generation generally operates at a constant rotating speed, and when the load changes, the enthalpy drop of the steam turbine regulating stage steam increases and decreases along with the change of the load, so that the stage speed ratio deviates from an optimal value, and the efficiency of the steam turbine is reduced. Especially under the low-load working condition of large enthalpy drop value of the adjusting level, the economical efficiency of the steam turbine set is deteriorated.
When the unit reduces the load, an external multi-stage steam turbine can be considered to replace an adjusting stage to bear huge steam enthalpy drop, because the enthalpy drop distributed by each stage can be reduced by increasing the stage number, the stage speed ratio can reach the optimal value, and the high-efficiency operation under the low-load working condition is realized. However, when the load of the unit is increased, the total enthalpy drop of the outboard turbine is greatly reduced, and the multiple stages thereof cause the speed ratio to deviate from the optimal value, resulting in reduced efficiency. Therefore, solving the problem of matching the load with the blade stage number is a key issue for realizing high efficiency of the outboard steam turbine in a wider load range.
Disclosure of Invention
In view of the above problems, the present invention provides a multi-stage cascaded steam turbine system and a method for using the same, wherein when the load of the multi-stage cascaded steam turbine changes, the flow regulating devices corresponding to a plurality of turbine stages are regulated to adjust the number of stages of blades through which steam flows, and the number of stages of blades through which steam flows can change the enthalpy drop distribution of the multi-stage cascaded steam turbine, so that the enthalpy drop of each turbine stage meets the requirement of an optimal speed ratio, thereby ensuring that the multi-stage cascaded steam turbine has high efficiency when the load changes.
To achieve the above object, according to one aspect of the present invention, there is provided a multistage section tandem steam turbine system comprising: the steam turbine comprises a steam inlet hot end, a multistage section tandem steam turbine, a steam exhaust cold end and a power output end, wherein the steam inlet hot end provides high-parameter steam for the multistage section tandem steam turbine, the multistage section tandem steam turbine converts the high-parameter steam into low-parameter steam, and the steam exhaust cold end receives the low-parameter steam. The power output end is connected with the multistage section series connection type steam turbine to output power to do work. The multistage-section serial-connection type steam turbine comprises a rotor and a plurality of turbine stages, the turbine stages are sequentially connected on the rotor in series, and each turbine stage is provided with a steam inlet and a steam outlet. The steam outlet of the preceding turbine stage is connected to the steam inlet of the following turbine stage in the steam expansion direction, so that the steam between the turbine stages flows through each other.
Optionally, the steam at the steam inlet hot end enters the multistage-section tandem type steam turbine sequentially through the steam inlet pipeline and the steam inlet valve, wherein the steam inlet valve is used for controlling the flow of the inlet steam at the steam inlet hot end.
Optionally, each turbine stage is provided with at least one vane stage for performing work by steam expansion.
Optionally, the steam outlet of each turbine stage is further connected with a steam exhaust branch pipeline, and each steam exhaust branch pipeline is further provided with a flow regulating device for regulating the steam flow of the steam exhaust branch pipeline.
Optionally, each exhaust branch pipeline passes through the flow regulating device and then converges into one exhaust main pipeline, and the exhaust main pipeline is connected with the exhaust cold end and used for receiving the exhaust of the multistage-section tandem steam turbine.
Optionally, the steam intake hot end comprises a boiler or a steam header.
Optionally, the exhaust gas cold end comprises a condenser or a steam header.
Optionally, the power output is connected to the rotor of the multi-stage series turbine via a coupling or a gearbox.
Optionally, the power output comprises a generator, a pump, a fan or a compressor.
In another aspect, the present invention provides a method for using a multi-stage serial steam turbine system according to the above embodiment, in a load condition where the total enthalpy drop of the multi-stage serial steam turbine is minimum, adjusting a flow adjusting device on an exhaust branch pipeline corresponding to a first turbine stage to be in a large opening state, adjusting a flow adjusting device on an exhaust branch pipeline corresponding to a last turbine stage to be in a small opening state, adjusting flow adjusting devices on exhaust branch pipelines corresponding to the remaining turbine stages to be in a closed state, expanding steam of the multi-stage serial steam turbine through the first turbine stage to do work, where the enthalpy drop of the first turbine stage meets an optimal speed ratio requirement, and taking away heat generated by air blast through a small amount of steam in the remaining turbine stages to be discharged into an exhaust cold end. When the total enthalpy drop of the multi-stage serial turbine is increased due to load change, closing the flow regulating device on the steam exhaust branch pipeline corresponding to the first turbine stage, opening the flow regulating device on the steam exhaust branch pipeline corresponding to the next turbine stage, regulating the flow regulating device on the steam exhaust branch pipeline corresponding to the last turbine stage and keeping a small opening state, wherein the flow regulating devices corresponding to the rest of the turbine stages are in a closed state, steam of the multi-stage serial turbine sequentially passes through the first turbine stage and the next turbine stage to expand and work, the enthalpy drop of the first turbine stage and the next turbine stage meets the requirement of an optimal speed ratio, and the rest of the turbine stages take away heat generated by blast through a small amount of steam and discharge the heat into a steam exhaust cold end. Under the load working condition that the total enthalpy drop of the multistage-section tandem steam turbine is maximum, the flow regulating devices on the steam exhaust branch pipelines corresponding to the last turbine stage are regulated to be in a fully-opened state, the flow regulating devices on the steam exhaust branch pipelines corresponding to the other turbine stages are in a closed state, steam of each turbine stage of the multistage-section tandem steam turbine expands to work, and the enthalpy drop of each turbine stage meets the requirement of the optimal speed ratio.
Based on the technical scheme, compared with the prior art, the multistage-section series-connection type steam turbine system and the using method thereof have the following beneficial effects that:
(1) the enthalpy drop distribution of the turbine stages under different loads is changed by adjusting the number of the blade stages through which steam flows, so that the speed ratio of the turbine stages doing work through expansion is always close to an optimal value, and the multi-stage series connection type steam turbine is ensured to have higher efficiency when the load is changed.
(2) The adaptability of the multistage-section tandem steam turbine to load change is realized by the tandem connection or the disassembly of the downstream turbine stage, and the multistage-section tandem steam turbine operates at a constant pressure according to higher steam parameters, so that the realization of higher circulating heat efficiency is facilitated.
(3) When the total enthalpy drop of the multistage-section tandem steam turbine is reduced, the downstream turbine stage exits from the steam expansion process, the heat generated by blast air is taken away only through a small amount of steam, the downstream section is a low-temperature area, the occupied enthalpy drop is small, the temperature of the turbine stage can be prevented from exceeding a safety value, and the influence on the total efficiency of the multistage-section tandem steam turbine is small.
(4) Under various load conditions, steam expansion passes through the first turbine stage, the enthalpy drop of the stage always meets the requirement of the optimal speed ratio, and the temperature change of the stage is controlled in a smaller range, so that the change amplitude of the transient thermal stress of the rotor is reduced, and the change rate of the load of the multistage-stage tandem steam turbine is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a multi-stage section tandem steam turbine system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of using a multi-stage cascade steam turbine system according to another embodiment of the present invention.
[ description of reference ]
1-steam inlet hot end; 2-multistage section tandem type steam turbine; 3-steam exhaust cold end; 4-a power output; 5-a steam inlet pipeline; 6-an air inlet valve; 7-the first turbine stage; 8-a second turbine stage; 9-a third turbine stage; 10-a first exhaust branch line; 11-a second exhaust branch line; 12-a third exhaust branch line; 13-a first flow regulating device; 14-a second flow regulating device; 15-third flow regulating means; 16-a steam exhaust main pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a multi-stage series steam turbine system, including: the system comprises a steam inlet hot end 1, a multistage section tandem type steam turbine 2, a steam exhaust cold end 3 and a power output end 4. The steam inlet hot end 1 provides high-parameter steam for the multistage-section tandem steam turbine 2, and the multistage-section tandem steam turbine 2 converts the high-parameter steam into low-parameter steam. The exhaust cold end 3 receives low parameter steam. The power output end 4 is connected with the multistage-section serial-type turbine 2 and outputs power to do work.
The multistage tandem steam turbine 2 includes a rotor and a plurality of turbine stages, which are connected in series in sequence and connected to the same rotor. Each turbine stage is provided with a steam inlet and a steam outlet, and the steam outlet of the previous turbine stage is connected with the steam inlet of the next turbine stage along the steam expansion direction, so that steam at the steam inlet hot end 1 passes through the steam inlet and the steam outlet of each turbine stage and flows in sequence.
In the embodiment of the invention, steam at the steam inlet hot end 1 sequentially passes through the steam inlet pipeline 5 and the steam inlet valve 6 to enter the multistage-section tandem steam turbine 2, and the steam inlet valve 6 is used for controlling the steam flow entering the multistage-section tandem steam turbine 2.
In the embodiment of the present invention, the number of the plurality of turbine stages may be set according to practical applications, and the number is not particularly limited in the present invention. Illustratively, as shown in fig. 1, for convenience of description, the multi-stage cascade steam turbine 2 may specifically include, but is not limited to, 3 turbine stages.
As shown in fig. 1, when the number of the plurality of turbine stages is 3, the multistage tandem steam turbine 2 sequentially includes a first turbine stage 7, a second turbine stage 8, and a third turbine stage 9, the three turbine stages are connected in series and connected to the same rotor, each turbine stage is provided with a steam inlet and a steam outlet, the steam outlet of the first turbine stage 7 is connected to the steam inlet of the second turbine stage 8, and the steam outlet of the second turbine stage 8 is connected to the steam inlet of the third turbine stage 9, so that steam between the three turbine stages flows through each other. And moreover, the change of the flow area of each turbine stage meets the steam expansion rule.
Specifically, each turbine stage comprises at least one blade stage, the number of the blade stages can adjust the enthalpy drop of the turbine stage, and the enthalpy drop distribution of each turbine stage under different loads is changed by adjusting the number of the blade stages through which steam expands to flow, so that the speed ratio of the steam expanded turbine stage is always close to an optimal value.
In an embodiment of the present invention, a steam outlet of each stage corresponding to the first turbine stage 7, the second turbine stage 8, and the third turbine stage 9 is connected to a first steam exhaust branch pipeline 10, a second steam exhaust branch pipeline 11, and a third steam exhaust branch pipeline 12, respectively, and the first steam exhaust branch pipeline 10, the second steam exhaust branch pipeline 11, and the third steam exhaust branch pipeline 12 may further be provided with a first flow rate adjusting device 13, a second flow rate adjusting device 14, and a third flow rate adjusting device 15, respectively, so as to adjust a steam flow rate of each steam exhaust branch pipeline.
In an embodiment of the present invention, the multi-stage series steam turbine system may further include a main exhaust steam pipeline 16, the steam in the first, second, and third branch exhaust steam pipelines 10, 11, and 12 is collectively merged into the main exhaust steam pipeline 16 through the first, second, and third flow adjusting devices 13, 14, and 15, and the steam in the main exhaust steam pipeline 16 enters the exhaust cold end 3 to receive the exhaust steam of the multi-stage series steam turbine 2.
In one embodiment of the present invention, the hot end 1 of the steam inlet may comprise a boiler, a steam header or other heat source that can provide working steam for the present invention.
In one embodiment of the present invention, the exhaust cold end 3 may comprise a condenser, a steam header or other cold source for receiving the steam of the present invention.
In one embodiment of the invention, the power output can be connected to the rotor of the multi-stage series turbine via a coupling or a gearbox.
In one embodiment of the present invention, the power output 4 may include a generator, a pump, a fan, or a compressor, among other power consuming devices.
As shown in FIG. 2, another embodiment of the present invention provides a method for using a multi-stage cascade steam turbine system according to the above, comprising the following steps S1-S3.
S1, under the load condition that the total enthalpy drop of the multi-stage series turbine 2 is minimum, adjusting a first flow adjusting device 13 on a first exhaust branch pipeline 10 of a first turbine stage 7 to be in a large opening degree state, adjusting a third flow adjusting device 15 on a third exhaust branch pipeline 12 of a third turbine stage 9 to be in a small opening degree state, adjusting a second flow adjusting device 14 on a second exhaust branch pipeline 11 of a second turbine stage 8 to be in a closed state, expanding and working the steam of the multi-stage series turbine 2 through the first turbine stage 7, enabling the enthalpy drop of the first turbine stage 7 to meet the requirement of an optimal speed ratio, taking away the heat generated by blast through a small amount of steam in the second turbine stage 8 and the third turbine stage 9, discharging the steam into a steam exhaust cold end 3, defining the second turbine stage 8 and the third turbine stage 9 as downstream turbine stages, and enabling the downstream turbine stages to be in a low-temperature steam expansion area, the enthalpy drop is small, and the temperature of each turbine stage is prevented from exceeding a safety value.
S2, when the total enthalpy drop of the multi-stage series turbine 2 is increased due to load change, closing the first flow regulating device 13 on the first exhaust branch pipeline 10 of the first turbine stage 7, wherein the first flow regulating device 13 corresponding to the first turbine stage 7 can be defined as an upstream turbine stage, opening the second flow regulating device 14 on the second exhaust branch pipeline 11 corresponding to the second turbine stage 8, adjusting the third flow regulating device 15 on the third exhaust branch pipeline 12 corresponding to the third turbine stage 9 and keeping a small opening state, allowing the steam of the multi-stage series turbine 2 to sequentially expand through the first turbine stage 7 and the second turbine stage 8 to carry away, allowing the enthalpy drops of the first turbine stage 7 and the second turbine stage 8 to meet the requirement of optimal speed ratio, allowing the third turbine stage 9 to blow the generated heat through a small amount of steam, to the exhaust cold end 3 to avoid the temperature of each turbine stage exceeding safe values.
S3, under the load condition that the total enthalpy drop of the multi-stage series steam turbine 2 is maximum, the third flow regulating device 15 on the third exhaust branch pipeline 12 of the third turbine stage 9 is regulated to be in a full-open state, the first flow regulating device 13 and the second flow regulating device 14 on the first exhaust branch pipeline 10 and the second exhaust branch pipeline 11 corresponding to the first turbine stage 7 and the second turbine stage 8 are in a closed state, steam of each turbine stage of the multi-stage series steam turbine 2 expands to work, and the enthalpy drop of each turbine stage meets the requirement of an optimal speed ratio to achieve high efficiency.
Specifically, under different load conditions, each turbine stage of the multistage-stage tandem steam turbine 2 is connected to the same rotor, and steam flows through the first turbine stage 7, so that enthalpy drop of the first turbine stage 7 always meets the requirement of the optimal speed ratio, and temperature change of the first turbine stage 7 is small, thereby reducing change of transient thermal stress of the rotor, improving change rate of the multistage-stage tandem steam turbine 2, and ensuring that the multistage-stage tandem steam turbine 2 has high efficiency.
In summary, the embodiment of the present invention provides a multistage section tandem steam turbine system and a method for using the same, where the system includes a steam inlet hot end 1, a multistage section tandem steam turbine 2, a steam exhaust cold end 3, and a power output end 4. The flow of steam is controlled by connecting a plurality of turbine stages in series, so that the steam of the corresponding turbine stage expands, the quantity of the steam flowing through the blade stages is adjusted, the enthalpy drop distribution of each stage under different loads is changed by adjusting the quantity of the blade stages, the speed ratio of each main working stage is always close to the optimal value, and the multi-stage-series steam turbine has higher efficiency when the load is changed.
It should be understood that the specific order or hierarchy of steps in the inventive process is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present invention. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy.
Similarly, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. Reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A multi-stage cascaded steam turbine system, comprising: admission hot end (1), multistage section series connection steam turbine (2), steam extraction cold end (3) and power take off (4), wherein:
the steam inlet hot end (1) provides high-parameter steam for the multistage series-connected steam turbine (2);
the multistage serial turbine (2) converts the high-parameter steam into low-parameter steam;
the exhaust cold end (3) receives the low-parameter steam;
the power output end (4) is connected with the multistage serial turbine (2) to output power to do work;
the multistage serial steam turbine (2) comprises a rotor and a plurality of turbine stages, the plurality of turbine stages are sequentially connected in series on the rotor, and each turbine stage is provided with a steam inlet and a steam outlet;
and in the steam expansion direction, the steam outlet of the front turbine stage is connected with the steam inlet of the rear turbine stage, so that the steam among the plurality of turbine stages can be mutually circulated.
2. The multi-stage section tandem steam turbine system according to claim 1,
steam of the steam inlet hot end (1) sequentially passes through a steam inlet pipeline (5) and a steam inlet valve (6) to enter the multistage serial steam turbine (2), wherein the steam inlet valve (6) is used for controlling the flow of the steam entering the steam inlet hot end (1).
3. The multi-stage series steam turbine system according to claim 1, wherein each of said turbine stages is provided with at least one blade stage for performing work by steam expansion.
4. The multi-stage series steam turbine system according to claim 1, wherein a steam outlet of each of the turbine stages is further connected to a branch steam exhaust line, and each branch steam exhaust line is further provided with a flow rate adjusting device for adjusting a steam flow rate of the branch steam exhaust line.
5. The multi-stage series steam turbine system according to claim 4, wherein each of the branch exhaust lines jointly opens into a main exhaust line (16) after passing through the flow control device, and the main exhaust line (16) is connected to the cold exhaust end (3) and is configured to receive the exhaust steam of the multi-stage series steam turbine (2).
6. The multi-stage section tandem steam turbine system according to claim 1, wherein the steam inlet hot end (1) comprises a boiler or a steam header.
7. The multi-stage series steam turbine system according to claim 1, wherein the exhaust cold end (3) comprises a condenser or a steam header.
8. The multi-stage section tandem steam turbine system according to claim 1, wherein the power output (4) is connected to the rotor of the multi-stage section tandem steam turbine (2) via a coupling or a gearbox.
9. The multi-stage section series steam turbine system according to claim 1, wherein the power output (4) comprises a generator, a pump, a fan or a compressor.
10. A method of using a multi-stage series steam turbine system according to any one of claims 1 to 9, comprising the steps of:
under the load working condition that the total enthalpy drop of the multistage-section tandem steam turbine (2) is minimum, a flow adjusting device on a steam exhaust branch pipeline corresponding to a first turbine stage is adjusted to be in a large opening state, a flow adjusting device on a steam exhaust branch pipeline corresponding to a last turbine stage is adjusted to be in a small opening state, flow adjusting devices on steam exhaust branch pipelines corresponding to other turbine stages are in a closed state, steam of the multistage-section tandem steam turbine (2) expands through the first turbine stage to do work, enthalpy drop of the first turbine stage meets the requirement of an optimal speed ratio, and heat generated by blast air is taken away by the other turbine stages through a small amount of steam and is exhausted to a steam exhaust cold end (3);
when the total enthalpy drop of the multi-stage serial steam turbine (2) is increased due to load change, closing a flow regulating device on a steam exhaust branch pipeline corresponding to a first turbine stage, opening a flow regulating device on a steam exhaust branch pipeline corresponding to a next turbine stage, regulating the flow regulating device on the steam exhaust branch pipeline corresponding to the last turbine stage and keeping a small opening state, wherein the flow regulating devices corresponding to the rest of the turbine stages are in a closed state, steam of the multi-stage serial steam turbine (2) sequentially passes through the first turbine stage and the next turbine stage to expand and work, enthalpy drops of the first turbine stage and the next turbine stage meet the requirement of an optimal speed ratio, and heat generated by air blowing is taken away by the rest of the turbine stages through a small amount of steam and is discharged into a steam exhaust cold end (3);
under the load working condition that the total enthalpy drop of the multistage-section tandem steam turbine (2) is maximum, the flow adjusting devices on the steam exhaust branch pipelines corresponding to the last turbine stage are adjusted to be in a fully-opened state, the flow adjusting devices on the steam exhaust branch pipelines corresponding to the other turbine stages are all in a closed state, steam of each turbine stage of the multistage-section tandem steam turbine (2) expands to work, and the enthalpy drop of each turbine stage meets the requirement of the optimal speed ratio.
CN202210604672.8A 2022-05-30 2022-05-30 Multistage-section tandem type steam turbine system and using method thereof Pending CN114810225A (en)

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