CN109915222B - Opposite conveying device and method for medium-temperature and medium-pressure steam in cascade utilization power plant - Google Patents
Opposite conveying device and method for medium-temperature and medium-pressure steam in cascade utilization power plant Download PDFInfo
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Abstract
The invention discloses a device and a method for oppositely conveying medium-temperature and medium-pressure steam in a cascade utilization power plant, which improve the operation efficiency of a power generation steam turbine unit, improve the steam quality of a unit at the tail end of a medium-temperature and medium-pressure steam main pipe and reduce the heat loss of the steam. The device comprises a plurality of boilers, a high-temperature high-pressure steam main pipe and a medium-temperature medium-pressure steam main pipe; each boiler is respectively connected with a high-temperature high-pressure steam main pipe through an air outlet pipe of the boiler, and a first back pressure type power generation steam turbine is connected between the head end of the high-temperature high-pressure steam main pipe and the head end of the medium-temperature medium-pressure steam main pipe; a second back pressure type power generation steam turbine is connected between the tail end of the high-temperature high-pressure steam main pipe and the tail end of the medium-temperature medium-pressure steam main pipe; a temperature and pressure reducing device is connected between the high-temperature high-pressure steam main pipe and the medium-temperature medium-pressure steam main pipe; a plurality of condensing power generation turbine units are connected between the front end and the tail end of the medium-temperature and medium-pressure steam main pipe; and the tail end of the medium-temperature and medium-pressure steam main pipe is connected with a pure condensing type power generation turbine unit.
Description
Technical Field
The disclosure relates to the technical field of cascade utilization power plant production, in particular to a device and a method for oppositely conveying medium-temperature and medium-pressure steam in a cascade utilization power plant.
Background
The cascade utilization power plant produces high-pressure steam through a boiler in production, drives a steam turbine to work through the steam, and then drives a power generation steam turbine rotor to rotate so as to drive a magnetic field to rotate and cut a stator coil, thereby generating electric energy. The steam turbine requires different steam pressures and temperatures depending on the type of turbine.
The existing steam turbine is composed of three types of back pressure type, extraction condensing type and pure condensing type, wherein steam inlet of the back pressure type steam turbine is high-temperature high-pressure steam and discharges medium-temperature medium-pressure steam after completion, the extraction condensing type and pure condensing type steam turbines are medium-temperature medium-pressure steam inlet, and a required medium-temperature medium-pressure steam source is mainly composed of steam after temperature and pressure of the high-temperature high-pressure steam are reduced by temperature and pressure reduction and steam discharged from a back pressure type power generation steam turbine set.
At present, steam is generated by a boiler, and respectively enters a backpressure power generation steam turbine through a high-pressure steam main pipe, then the exhaust steam of the backpressure power generation steam turbine jointly enters a medium-temperature medium-pressure steam main pipe, and then is respectively conveyed to each extraction condensing type and pure condensing type power generation steam turbine set through the medium-temperature medium-pressure steam main pipe. The inventor finds that the steam inlet conditions of the steam turbine at the tail end of the medium-temperature and medium-pressure steam main pipe are insufficient due to the fact that the steam turbine units of the extraction condensing type and the pure condensing type power generation turbine units are large in number, the length of the medium-temperature and medium-pressure steam pipeline is long, and the steam heat and pressure loss at the tail end of the medium-temperature and medium-pressure steam main pipe are serious, namely, the pressure and the temperature are reduced, so that the steam turbine units cannot completely output power.
Disclosure of Invention
In order to overcome the defects of the prior art, the disclosure provides a device and a method for oppositely conveying medium-temperature and medium-pressure steam in a power plant in a gradient manner, so that the operation efficiency of a power generation steam turbine unit is improved, the steam quality of a unit at the tail end of a medium-temperature and medium-pressure steam main pipe is improved, and the heat loss of the steam is reduced.
The technical scheme adopted by the disclosure is as follows:
a middle-temperature and middle-pressure steam opposite-direction conveying device for a cascade utilization power plant comprises a plurality of boilers, a high-temperature and high-pressure steam main pipe and a middle-temperature and middle-pressure steam main pipe;
each boiler is respectively connected with a high-temperature high-pressure steam main pipe through an air outlet pipe of the boiler, and a first back pressure type power generation steam turbine is connected between the head end of the high-temperature high-pressure steam main pipe and the head end of the medium-temperature medium-pressure steam main pipe; a second back pressure type power generation steam turbine is connected between the tail end of the high-temperature high-pressure steam main pipe and the tail end of the medium-temperature medium-pressure steam main pipe;
and after the high-temperature high-pressure steam in the high-temperature high-pressure steam main pipe passes through the first back-pressure power generation steam turbine and the second back-pressure power generation steam turbine, the first back-pressure power generation steam turbine and the second back-pressure power generation steam turbine oppositely input the medium-temperature medium-pressure steam from two ends of the medium-temperature medium-pressure steam main pipe.
Furthermore, a temperature and pressure reducing device is connected between the high-temperature high-pressure steam main pipe and the medium-temperature medium-pressure steam main pipe.
Furthermore, the first back pressure type power generation steam turbine and the second back pressure type power generation steam turbine are connected with pressure gauges.
Furthermore, a plurality of extraction condensing type power generation turbine units are connected between the front end and the tail end of the medium-temperature and medium-pressure steam main pipe.
Furthermore, the tail end of the medium-temperature and medium-pressure steam main pipe is connected with a pure condensing type power generation turbine set.
Furthermore, each extraction condensing type power generation turbine unit and each straight condensing type power generation turbine unit are respectively connected with a pressure gauge.
A working method of a medium-temperature and medium-pressure steam opposite conveying device in a cascade utilization power plant comprises the following steps:
high-temperature high-pressure steam is generated by a plurality of boilers and is respectively conveyed into high-temperature high-pressure steam main pipes;
after high-temperature high-pressure steam in the high-temperature high-pressure steam main pipe sequentially passes through the first back-pressure power generation steam turbine, the temperature and pressure reduction device and the second back-pressure power generation steam turbine, middle-temperature middle-pressure steam is oppositely input from two ends of the middle-temperature middle-pressure steam main pipe, and the middle-temperature middle-pressure steam moves towards the center of the middle-temperature middle-pressure steam main pipe together;
the medium-temperature and medium-pressure steam in the medium-temperature and medium-pressure steam main pipe sequentially enters a plurality of extraction condensing type power generation steam turbine units and a straight condensing type power generation steam turbine unit.
Through above-mentioned technical scheme, this disclosed beneficial effect is:
the high-temperature high-pressure steam is generated by a plurality of boilers and is respectively conveyed to a high-temperature high-pressure steam main pipe, then the medium-temperature medium-pressure steam is conveyed to a medium-temperature medium-pressure steam main pipe through a first back-pressure power generation steam turbine, a temperature reduction and pressure reduction device and a second back-pressure power generation steam turbine respectively, the original single-end input of the medium-temperature medium-pressure steam main pipe is changed into two-end opposite input, the medium-temperature medium-pressure steam moves towards the center of the medium-temperature medium-pressure steam main pipe together, and then the medium-temperature medium-pressure steam sequentially enters a plurality of extraction condensing power generation steam turbine units and a plurality of straight condensing power generation steam turbine units, so that the quality of the steam in the medium-temperature medium-pressure steam main pipe is guaranteed, the heat loss is reduced, the efficiency of the power generation steam turbine units is improved, and the condition that the tail-end steam parameters and the quality of the medium-temperature medium-pressure steam main pipe are reduced and the requirements of the units cannot be met is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the application and not to limit the disclosure.
FIG. 1 is a block diagram of a medium temperature and pressure steam counter-direction conveying device in a cascade utilization power plant according to one or more embodiments;
the system comprises a boiler 1, a boiler 2, a high-temperature high-pressure steam main pipe 3, a first back-pressure power generation steam turbine 4, a temperature and pressure reduction device 5, a second back-pressure power generation steam turbine 6, a medium-temperature medium-pressure steam main pipe 7, a condensing extraction type power generation steam turbine set and a condensing pure power generation steam turbine set 8.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
One or more embodiments provide a device for oppositely conveying medium-temperature and medium-pressure steam in a cascade utilization power plant, which supplies air into a main pipe from two ends of the main pipe respectively by changing the trend of the high-temperature and high-pressure steam and the trend of the medium-temperature and medium-pressure steam respectively, so that the temperature and pressure loss of the steam in the main pipe is reduced, the steam quality of a unit at the tail end of the medium-temperature and medium-pressure steam main pipe is improved, each unit can achieve the maximum output, and the resource waste is avoided.
Referring to fig. 1, the opposite direction conveying device for medium-temperature and medium-pressure steam in a cascade utilization power plant comprises a plurality of boilers 1, a high-temperature and high-pressure steam main pipe 2, a first back-pressure power generation steam turbine 3, a temperature and pressure reduction device 4, a second back-pressure power generation steam turbine 5, a medium-temperature and medium-pressure steam main pipe 6, a straight condensing power generation steam turbine unit 8 and a plurality of condensing power generation steam turbine units 7.
Specifically, each boiler 1 is connected with a high-temperature high-pressure steam main pipe 2 through an air outlet pipe of the boiler, and is used for conveying the generated high-temperature high-pressure steam to the high-temperature high-pressure steam main pipe; the front end of the high-temperature high-pressure steam main pipe 2 is connected with a first back-pressure power generation turbine 3 through a unit gas supply pipeline, and the tail end of the high-temperature high-pressure steam main pipe 2 is connected with a second back-pressure power generation turbine 4 through a unit gas supply pipeline and used for respectively conveying high-temperature high-pressure steam to the first back-pressure power generation turbine 3 and the second back-pressure power generation turbine 4; the first back-pressure power generation steam turbine 3 is connected with the front end of the medium-temperature and medium-pressure steam main pipe 6 through an air outlet pipe of the first back-pressure power generation steam turbine 3 and is used for conveying medium-temperature and medium-pressure steam from the front end of the medium-temperature and medium-pressure steam main pipe 6 to the center of the medium-temperature and medium-pressure steam main pipe 6; the second back-pressure power generation steam turbine 4 is connected with the tail end of the medium-temperature and medium-pressure steam main pipe 6 through an air outlet pipe of the second back-pressure power generation steam turbine and is used for conveying medium-temperature and medium-pressure steam to the center of the medium-temperature and medium-pressure steam main pipe 6 from the tail end of the medium-temperature and medium-pressure steam main pipe 6; a temperature and pressure reducing device 4 is connected between the high-temperature high-pressure steam main pipe 2 and the medium-temperature medium-pressure steam main pipe 6, and the high-temperature high-pressure steam output by the high-temperature high-pressure steam main pipe 2 is conveyed to the medium-temperature medium-pressure steam main pipe 6 after passing through the temperature and pressure reducing device 4; the steam turbine generator set comprises a medium-temperature and medium-pressure steam main pipe 6, and is characterized in that a plurality of extraction condensing type power generation steam turbine sets 7 are connected between the front end and the tail end of the medium-temperature and medium-pressure steam main pipe 6, the tail end of the medium-temperature and medium-pressure steam main pipe 6 is connected with a straight condensing type power generation steam turbine set 8, medium-temperature and medium-pressure steam entering the medium-temperature and medium-pressure steam main pipe 6 moves towards the center of the medium-temperature and medium-pressure steam main pipe 6 and then sequentially enters the extraction condensing type power generation steam turbine sets 7 and the straight condensing type power generation steam turbine set 8, so that the quality of steam in the medium-temperature and medium-pressure steam main pipe is guaranteed, heat loss is reduced, and the efficiency of the power generation steam turbine sets is improved.
In this embodiment, the temperature and pressure reduction device 4 adopts a prior art structure, and is not described in detail in this application.
In this embodiment, pressure gauges are connected to the first back pressure power turbine and the second back pressure power turbine.
In this embodiment, each of the extraction condensing type power generation turbine set and the straight condensing type power generation turbine set is connected with a pressure gauge.
The opposite conveying device for medium-temperature and medium-pressure steam in a power plant is utilized in the cascade manner, high-temperature and high-pressure steam is generated by a plurality of boilers 1 and is respectively conveyed to a high-temperature and high-pressure steam main pipe 2, then respectively conveying medium-temperature medium-pressure steam to a medium-temperature medium-pressure steam main pipe 6 through a first back-pressure power generation steam turbine 3, a temperature and pressure reduction device 4 and a second back-pressure power generation steam turbine 5, changing the original single-end input of the medium-temperature medium-pressure steam main pipe into two-end opposite input, enabling the medium-temperature medium-pressure steam to move towards the center of the medium-temperature medium-pressure steam main pipe 6 together, and then sequentially entering a plurality of extraction condensing power generation steam turbine units 7 and a straight condensing power generation steam turbine unit 8, thereby ensuring the quality of the steam in the medium-temperature and medium-pressure steam main pipe, reducing the heat loss, improving the efficiency of the power generation steam turbine set, thereby solving the problem that the steam parameters and quality at the tail end of the medium-temperature and medium-pressure steam main pipe are reduced and the requirement of the unit cannot be met.
One or more embodiments provide a method for working a medium temperature and pressure steam opposite direction conveying device in a cascade utilization power plant, which comprises the following steps:
and S101, generating high-temperature high-pressure steam by a plurality of boilers, and respectively conveying the generated high-temperature high-pressure steam to a high-temperature high-pressure steam main pipe.
S102, conveying high-temperature and high-pressure steam in the high-temperature and high-pressure steam main pipe to a first back-pressure power generation steam turbine from the head end of the high-temperature and high-pressure steam main pipe; and the steam is conveyed to a second back pressure type power generation steam turbine from the tail end of the high-temperature high-pressure steam main pipe.
S103, transmitting the medium-temperature and medium-pressure steam discharged by the first back-pressure power generation steam turbine from the front end of the medium-temperature and medium-pressure steam main pipe to the center of the medium-temperature and medium-pressure steam main pipe; and the medium-temperature and medium-pressure steam discharged by the second back-pressure power generation steam turbine is transmitted to the center of the medium-temperature and medium-pressure steam main pipe from the tail end of the medium-temperature and medium-pressure steam main pipe.
And S104, sequentially conveying the medium-temperature and medium-pressure steam in the medium-temperature and medium-pressure steam main pipe to a plurality of extraction condensing type power generation steam turbine units and a straight condensing type power generation steam turbine unit.
In this embodiment, the method for operating the intermediate temperature and pressure steam counter-direction conveying device in the cascade utilization power plant further includes:
the high-temperature high-pressure steam in the high-temperature high-pressure steam main pipe is also conveyed to the temperature and pressure reduction device; and conveying the steam into the medium-temperature medium-pressure steam main pipe after passing through the temperature and pressure reduction device, and conveying the steam to the center of the medium-temperature medium-pressure steam main pipe.
The embodiment provides a working method for a cascade utilization medium-temperature and medium-pressure steam opposite conveying device in a power plant, high-temperature high-pressure steam is generated by a plurality of boilers and is respectively conveyed to a high-temperature high-pressure steam main pipe, then respectively conveying medium-temperature medium-pressure steam to a medium-temperature medium-pressure steam main pipe through a first back-pressure power generation steam turbine, a temperature and pressure reduction device and a second back-pressure power generation steam turbine, changing the original single-end input of the medium-temperature medium-pressure steam main pipe into two-end opposite input, enabling the medium-temperature medium-pressure steam to jointly move towards the center of the medium-temperature medium-pressure steam main pipe, and then sequentially entering a plurality of extraction condensing power generation steam turbine units and a straight condensing power generation steam turbine unit, thereby ensuring the quality of the steam in the medium-temperature and medium-pressure steam main pipe, reducing the heat loss, improving the efficiency of the power generation steam turbine set, thereby solving the problem that the steam parameters and quality at the tail end of the medium-temperature and medium-pressure steam main pipe are reduced and the requirement of the unit cannot be met.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (5)
1. A middle-temperature and middle-pressure steam opposite-direction conveying device for a cascade utilization power plant is characterized by comprising a plurality of boilers, a high-temperature and high-pressure steam main pipe and a middle-temperature and middle-pressure steam main pipe;
each boiler is respectively connected with a high-temperature high-pressure steam main pipe through an air outlet pipe of the boiler, and a first back pressure type power generation steam turbine is connected between the head end of the high-temperature high-pressure steam main pipe and the head end of the medium-temperature medium-pressure steam main pipe; a second back pressure type power generation steam turbine is connected between the tail end of the high-temperature high-pressure steam main pipe and the tail end of the medium-temperature medium-pressure steam main pipe;
each boiler transmits the generated high-temperature high-pressure steam to a high-temperature high-pressure steam main pipe, after the high-temperature high-pressure steam in the high-temperature high-pressure steam main pipe passes through a first back pressure type power generation steam turbine and a second back pressure type power generation steam turbine, the first back pressure type power generation steam turbine and the second back pressure type power generation steam turbine oppositely input medium-temperature medium-pressure steam from two ends of the medium-temperature medium-pressure steam main pipe;
a temperature and pressure reducing device is connected between the high-temperature high-pressure steam main pipe and the medium-temperature medium-pressure steam main pipe;
and a plurality of condensing power generation turbine units are connected between the front end and the tail end of the medium-temperature medium-pressure steam main pipe.
2. The opposite direction conveying device for medium-temperature and medium-pressure steam in a cascade utilization power plant as claimed in claim 1, wherein pressure gauges are connected to the first back-pressure power generation turbine and the second back-pressure power generation turbine.
3. The opposite direction conveying device for medium-temperature and medium-pressure steam in a cascade utilization power plant as claimed in claim 1, wherein the tail end of the medium-temperature and medium-pressure steam main pipe is connected with a pure condensing type power generation turbine unit.
4. The opposite direction conveying device for medium-temperature and medium-pressure steam in a cascade utilization power plant as claimed in claim 1 or 3, wherein each of the extraction condensing type power generation turbine unit and the straight condensing type power generation turbine unit is connected with a pressure gauge respectively.
5. A method for operating a medium-temperature and medium-pressure steam counter-conveying device in a cascade utilization power plant according to any one of claims 1 to 4, characterized by comprising the following steps:
high-temperature high-pressure steam is generated by a plurality of boilers and is respectively conveyed into high-temperature high-pressure steam main pipes;
after high-temperature high-pressure steam in the high-temperature high-pressure steam main pipe sequentially passes through the first back-pressure power generation steam turbine, the temperature and pressure reduction device and the second back-pressure power generation steam turbine, middle-temperature middle-pressure steam is oppositely input from two ends of the middle-temperature middle-pressure steam main pipe, and the middle-temperature middle-pressure steam moves towards the center of the middle-temperature middle-pressure steam main pipe together;
the medium-temperature and medium-pressure steam in the medium-temperature and medium-pressure steam main pipe sequentially enters a plurality of extraction condensing type power generation steam turbine units and a straight condensing type power generation steam turbine unit.
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