CN212105985U - Thermodynamic system capable of recycling redundant heat in starting process of unit - Google Patents
Thermodynamic system capable of recycling redundant heat in starting process of unit Download PDFInfo
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- CN212105985U CN212105985U CN202020471545.1U CN202020471545U CN212105985U CN 212105985 U CN212105985 U CN 212105985U CN 202020471545 U CN202020471545 U CN 202020471545U CN 212105985 U CN212105985 U CN 212105985U
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Abstract
The utility model discloses a can retrieve unit start-up process surplus thermal thermodynamic system, its technical scheme is: the system comprises a condenser, a steam turbine, a boiler reheater and a heating heat exchanger, wherein an input pipeline connected with the condenser is provided with an electric butterfly valve I and a low-pressure bypass valve, and the electric butterfly valve I and the low-pressure bypass valve are connected with a heating pipeline main pipe through a connecting pipe; the connecting pipe is provided with an electric butterfly valve II and a check valve I. The utility model discloses when the unit starts, boiler outlet main steam gets into the boiler reheater through high-pressure bypass valve, and boiler reheater export hot section steam gets into the contact pipe through low pressure bypass valve, electric butterfly valve and check valve, and the unnecessary steam of unit gets into the heating heat exchanger heat supply can realize that the heat supply unit is as early as possible to outer heat supply, retrieve the unnecessary heat of unit start-up process simultaneously.
Description
Technical Field
The utility model relates to a thermal power technical field especially relates to a can retrieve thermal power system of unit start-up process surplus heat.
Background
The bypass system is a steam temperature and pressure reducing system connected with the steam turbine in parallel, and the steam generated by the boiler is directly introduced into a reheater or a condenser through a pipeline, a valve and a control mechanism without passing through the steam turbine. The bypass system is used for coordinating the steam flow of the boiler when the unit is started, accelerating the starting speed and improving the starting condition.
The unit starting process consists of a plurality of stages: (1) in the process from the steam production of the boiler to the steam admission and flushing of the steam turbine, the steam produced by the boiler mainly preheats the whole system, all the steam enters the condenser through the high-low pressure bypass, and the heat is taken away by circulating water; (2) when the main steam parameters meet the steam inlet requirement of the steam turbine, the steam turbine enters steam to rush, the steam inlet quantity of the steam turbine is less than the steam production quantity of the boiler under the limitation of the rotating speed increasing rate and the temperature change rate in the rush process, the steam production quantity increasing rate of the boiler is greater than the steam inlet quantity increasing rate of the steam turbine, and redundant steam of a unit enters a condenser through a bypass system, so that the energy loss problem exists. This is the "boiler steam imbalance" during the unit start-up.
The northern unit generally bears part of the heating load of residents in the heating season, the resident heating belongs to civil engineering, the dragging area is wide, the influence is large, and the heating is guaranteed to be an important work of a power plant. In the starting process of the heating unit, the heating unit is expected to have the capacity of supplying heat to the outside as early as possible so as to meet the requirement of residents on heating load. However, on one hand, the starting process of the unit is long in time consumption, in the starting process of the unit, the normal steam extraction (generally five-stage steam extraction) of the steam turbine cannot supply steam to the outside, and the heat exchanger at the heat supply primary station cannot supply heating load to the outside because no heating steam is available; on the other hand, the steam of the boiler is unbalanced, redundant steam generated by the boiler can go everywhere, and part or all of the redundant steam enters the condenser through a bypass to recover working media, so that the problem of energy loss exists.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can retrieve the unnecessary thermal thermodynamic system of unit start-up process, can realize that the heat supply unit is as early as possible to external heat supply, retrieve the unnecessary heat of unit start-up process simultaneously.
In order to achieve the above purpose, the present invention is realized by the following technical solution:
the embodiment of the utility model provides a can retrieve thermal system of unit start-up process surplus heat, including condenser, steam turbine, boiler reheater and heating heat exchanger, the input pipeline that links to each other with the condenser installs electric butterfly valve I and low pressure bypass valve, link to each other with the heating pipeline main pipe through the tie pipe between electric butterfly valve I and the low pressure bypass valve; the communication pipe is provided with an electric butterfly valve I I and a check valve I.
As a further implementation mode, a tee joint is arranged between the electric butterfly valve I and the low-pressure bypass valve, and a tee joint branch pipe is connected with the connecting pipe.
As a further implementation mode, one end, far away from the electric butterfly valve I, of the low-pressure bypass valve is connected with an outlet hot section of a boiler reheater, and a medium-pressure combined valve is arranged between the outlet hot section of the boiler reheater and a medium-pressure cylinder of the steam turbine. The high pressure cylinder of the steam turbine is connected with the cold section of the boiler reheater, and the check valve I I is installed on the cold section of the boiler reheater.
As a further implementation, the outlet of the boiler reheater is connected to the high pressure cylinder through a main steam line, and the main steam line is provided with a high pressure combined valve. The main steam pipeline is connected with the cold section of the boiler reheater through a high-pressure bypass pipeline, and the high-pressure bypass pipeline is provided with a high-pressure bypass valve. The high pressure bypass line is connected to a port on the side of check valve I I remote from the turbine.
As a further implementation mode, the heating pipeline main pipe is provided with an electric butterfly valve II and a check valve II.
Above-mentioned the utility model discloses an embodiment's beneficial effect as follows:
(1) the electric butterfly valve is additionally arranged on the pipeline before the condenser is fed in one or more embodiments of the utility model, a tee joint is arranged between the electric butterfly valve and the low-pressure bypass valve, the tee branch pipe is newly connected with a connecting pipe all the way to be connected with a heating pipeline main pipe, and the connecting pipe is provided with the electric butterfly valve and a check valve to prevent heating steam from flowing back into the low-pressure bypass pipeline in normal operation;
(2) the utility model discloses a when one or more embodiment mode was started at the unit, boiler outlet main steam got into the boiler reheater through high-pressure bypass valve, and boiler reheater export hot section steam got into newly-increased contact pipe through low pressure bypass valve, electric butterfly valve and check valve, and the unnecessary steam of unit gets into the heating heat exchanger heat supply, can realize retrieving the unnecessary heat of unit start-up process in the time of external heat supply as early as possible.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic structural diagram of the present invention according to one or more embodiments:
the system comprises a high-pressure combined valve 1, a check valve I I, a check valve 3, a high-pressure bypass valve 4, a medium-pressure combined valve 5, a low-pressure bypass valve 6, an electric butterfly valve II, an electric butterfly valve I, an electric butterfly valve 9, an electric butterfly valve I I, an electric butterfly valve 10, a check valve I, an electric butterfly valve 11, a high-pressure cylinder 12, an intermediate-pressure cylinder 13, a low-pressure cylinder 14, a boiler 15, a heating heat exchanger 16, a condenser 17, a tee joint I, a tee joint 18, a tee joint I I, a tee joint II, a tee joint 20, a connecting pipe 21, a heating pipeline main pipe 22, a hot section 23, a main steam pipeline 24, a high-pressure bypass pipeline 25 and a cold.
Detailed Description
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 application 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/or "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;
the terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two elements may be connected directly or indirectly through an intermediate medium, or the two elements may be connected internally or in an interaction relationship, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.
The first embodiment is as follows:
the present invention will be described in detail with reference to the accompanying fig. 1, specifically, the structure is as follows:
the embodiment of the utility model provides a thermodynamic system capable of recovering the redundant heat in the starting process of a unit, which comprises a condenser 16, a steam turbine, a boiler 14 and a heating heat exchanger 15, wherein the condenser 16 is provided with a plurality of condensers; a high-pressure cylinder 11, an intermediate-pressure cylinder 12 and a low-pressure cylinder 13 are arranged in the steam turbine; the boiler is internally provided with a plurality of heating surfaces such as a superheater and a reheater.
An electric butterfly valve I8 is additionally arranged on a pipeline in front of the condenser 16, and a tee joint I17 is arranged on one side of the electric butterfly valve I8. The tee joint I17 branch pipe is connected with the heating pipeline main pipe 21 through the connecting pipe 20, and an electric butterfly valve I I9 and a check valve I10 are installed on the connecting pipe 20 to prevent heating steam from flowing back into a low-pressure bypass pipeline in normal operation.
The heating heat exchanger 15 is connected to the heating pipeline female pipe 21, and electric butterfly valves II 6 and I7 are installed on the heating pipeline female pipe 21. The other side of the main pipe of the three-way I17 is connected to the outlet hot section 22 of the boiler reheater 14, and the outlet hot section 22 of the boiler reheater 14 is provided with a three-way I I18 and a low-pressure bypass valve 5; wherein the low pressure bypass valve 5 is located between the tee junction I17 and the tee junction I I18. The tee joint I I18 is connected with the intermediate pressure cylinder 12 of the steam turbine through a pipeline, and the intermediate pressure joint valve 4 is installed on the pipeline.
The high pressure cylinder 11 of the steam turbine is connected to the cold leg 25 of the boiler reheater 14, and the cold leg 25 of the boiler reheater 14 is fitted with a check valve I I2. The outlet of the boiler reheater 14 is connected to the high pressure cylinder 11 through a main steam line 23, and the main steam line 23 is provided with the high pressure combined valve 1. The main steam pipeline 23 is connected with a cold section 25 of the boiler reheater 14 through a high-pressure bypass pipeline 24, and the high-pressure bypass pipeline 24 is provided with a high-pressure bypass valve 3. The high-pressure bypass line 24 is connected to a port of the check valve I I2 on the side away from the high-pressure cylinder 11.
The working principle of the embodiment is as follows:
in normal operation, main steam at the outlet of the boiler enters a high-pressure cylinder 11 of the steam turbine through a high-pressure joint steam valve 1, and the exhausted steam of the high-pressure cylinder 11 returns to a boiler reheater 14 through a check valve 2 of a cold section 25 to be reheated. Steam at an outlet hot section 22 of the boiler reheater 14 enters the intermediate pressure cylinder 12 through the intermediate pressure joint steam valve 4, sequentially passes through the intermediate pressure cylinder 12 and the low pressure cylinder 13, is cooled by circulating water in the condenser 16, and the working medium is recovered.
When the unit is started, main steam at the outlet of the boiler returns to the boiler reheater 14 through the high-pressure bypass valve 3, steam at the outlet hot section 22 of the boiler reheater 14 enters the connecting pipe 20 through the low-pressure bypass valve 5, the electric butterfly valve 9 and the check valve 10, and redundant steam of the unit enters the heating heat exchanger 15 for heating.
This embodiment utilizes bypass system to retrieve the unit start-up process unnecessary heat, can realize the heat supply unit to external heat supply as early as possible simultaneously.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A thermodynamic system capable of recovering redundant heat in a unit starting process comprises a condenser, a steam turbine, a boiler and a heating heat exchanger, and is characterized in that an input pipeline connected with the condenser is provided with an electric butterfly valve I and a low-pressure bypass valve, and the electric butterfly valve I and the low-pressure bypass valve are connected with a heating pipeline main pipe through a connecting pipe; the connecting pipe is provided with an electric butterfly valve II and a check valve I.
2. The thermodynamic system capable of recovering the excess heat generated during the starting process of the unit as claimed in claim 1, wherein a tee is provided between the electric butterfly valve I and the low-pressure bypass valve, and the tee branch is connected with the connecting pipe.
3. The thermodynamic system capable of recovering the excess heat generated during the unit starting process according to claim 1 or 2, wherein one end of the low-pressure bypass valve, which is far away from the electric butterfly valve I, is connected with an outlet hot section of a boiler reheater, and an intermediate-pressure combined valve is arranged between the outlet hot section of the boiler reheater and an intermediate-pressure cylinder of the steam turbine.
4. The thermodynamic system capable of recovering excess heat generated during the startup process of a unit according to claim 3, wherein the high-pressure cylinder of the steam turbine is connected to the cold section of the boiler reheater, and the cold section of the boiler reheater is provided with a check valve II.
5. A thermodynamic system capable of recovering excess heat from a plant start-up process, according to claim 4, wherein the outlet of the boiler reheater is connected to the high pressure cylinder by a main steam line, and the main steam line is provided with a high pressure combined valve.
6. A thermodynamic system capable of recovering excess heat from a train start-up process, according to claim 5, wherein the main steam line is connected to the boiler reheater cold section by a high pressure bypass line, and the high pressure bypass line is provided with a high pressure bypass valve.
7. A thermodynamic system capable of recovering excess heat from a unit start-up process as claimed in claim 6, wherein the high pressure bypass line is connected to a port on the side of the check valve II remote from the turbine.
8. The thermodynamic system capable of recovering the excess heat generated during the unit starting process as claimed in claim 1, wherein the heating pipeline main pipe is provided with an electric butterfly valve III and a check valve III.
9. A thermodynamic system capable of recovering excess heat from a unit start-up process according to claim 1, wherein the condenser is single or multiple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020471545.1U CN212105985U (en) | 2020-04-02 | 2020-04-02 | Thermodynamic system capable of recycling redundant heat in starting process of unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020471545.1U CN212105985U (en) | 2020-04-02 | 2020-04-02 | Thermodynamic system capable of recycling redundant heat in starting process of unit |
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| Publication Number | Publication Date |
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| CN212105985U true CN212105985U (en) | 2020-12-08 |
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| CN202020471545.1U Active CN212105985U (en) | 2020-04-02 | 2020-04-02 | Thermodynamic system capable of recycling redundant heat in starting process of unit |
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2020
- 2020-04-02 CN CN202020471545.1U patent/CN212105985U/en active Active
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