CN212618236U - Drainage system and supporting structure of low-pressure heater of generator set - Google Patents
Drainage system and supporting structure of low-pressure heater of generator set Download PDFInfo
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- CN212618236U CN212618236U CN202021053021.7U CN202021053021U CN212618236U CN 212618236 U CN212618236 U CN 212618236U CN 202021053021 U CN202021053021 U CN 202021053021U CN 212618236 U CN212618236 U CN 212618236U
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Abstract
The invention discloses a drainage system of a low-pressure heater of a generator set, which comprises a steam turbine, a condensation water tank and a multi-stage low-pressure heater, wherein at least one drainage outlet of a last-stage low-pressure heater, a drainage outlet of a penultimate-stage low-pressure heater or a drainage outlet of a last-stage low-pressure heater of the penultimate-stage low-pressure heater is connected with an inlet of the condensation water tank through a pipeline. Hydrophobic through with low pressure feed water heater flows to the condensate tank in by oneself step, avoids using low hydrophobic pump that adds, has reduced the energy consumption that low hydrophobic pump brought, and hydrophobic as the heat source of low quality can replace the deoxidization of most steam completion condensate water in the condensate tank in addition, and the economic nature is more excellent.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a drainage system of a low-pressure heater of a generator set.
Background
For a steam turbine and a unit with a high-level low-pressure heater at the last stage, drainage of the last-stage low-pressure heater at the penultimate stage or penultimate stage cannot realize step-by-step self-flow, and a condensation water tank cannot meet the oxygen removal requirement of the unit. Generally, a low pressure and high pressure drainage pump is adopted to pump drainage back to a final-stage low pressure heater, and an external heat source (such as external steam like auxiliary steam) is led to a condensation water tank to meet the oxygen removal requirement of condensation water in each working condition. However, the low-pressure-plus-drainage pump has high energy consumption, cavitation is easy to occur, the equipment pipeline is easy to vibrate, the maintenance amount is large, and the quality of steam used as a deoxidizing heat source of the condensed water tank is high, so that the economic efficiency of the unit is influenced.
Disclosure of Invention
The invention provides a drainage system of a low-pressure heater of a generator set aiming at the problems in the prior art, and solves the technical problems that in the drainage system of the low-pressure heater in the prior art, due to the use of a low-pressure drainage pump, the system is high in energy consumption, cavitation is easy to occur, and oxygen is removed by introducing an external heat source, so that the economic benefit is low.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a genset low pressure heater drain system comprises:
the steam turbine, the condensate tank and the multistage low pressure heater, the hydrophobic outlet of last low pressure heater among the multistage low pressure heater, the hydrophobic outlet of time last low pressure heater or the hydrophobic outlet of last low pressure heater of time last low pressure heater at least one hydrophobic outlet of water tank's entry linkage with the condensate tank through the pipeline.
According to the invention, the drain water in the low-pressure heater is discharged into the condensed water tank in a self-flowing manner through the pipeline between the drain water outlet of the last-stage low-pressure heater, the penultimate-stage low-pressure heater or the last-stage low-pressure heater of the penultimate-stage low-pressure heater and the inlet of the condensed water tank, so that a low-pressure drain pump is avoided, the energy consumption caused by the low-pressure drain pump is reduced, the drain water serving as a low-quality heat source can replace most steam to complete the deoxidization of the condensed water in the condensed water tank, the energy consumption of a generator set is reduced, and the economy.
Further, the drainage outlet of each low-pressure heater in the plurality of low-pressure heaters is connected with the inlet of the condensation water tank through a pipeline.
Each stage of the low pressure heater described herein refers to all low pressure heaters included in the system.
Furthermore, the water drainage outlet of at least one stage of low-pressure heater in the multi-stage low-pressure heater is also connected with the water drainage inlet of the next stage of low-pressure heater of the at least one stage of low-pressure heater through other pipelines.
In the present invention, "the upper stage low-pressure heater" and "the lower stage low-pressure heater" refer to that in the drainage system, the first stage low-pressure heater located closer to the condenser than the certain stage low-pressure heater is referred to as "the lower stage low-pressure heater", and the first stage low-pressure heater located farther from the condenser is referred to as "the upper stage low-pressure heater", in the flow direction of the condensed water. "last stage low pressure heater" refers to the last stage low pressure heater located closest to the condenser. "Secondary low pressure heater" refers to the last low pressure heater of the last stage low pressure heater.
Further, the condensation water tank is arranged separately from the steam exhaust device of the generator set. The condensation water tank is a device for storing condensation water, can be used as a component of a steam exhaust device of the generator set, and can also be separated from the steam exhaust device of the generator set for independent use. On the premise that a steam turbine of the generator set is arranged in a high position, the arrangement mode of the condensation water tank is preferably that the condensation water tank is separated from a steam exhaust device of the generator set and is arranged independently.
Further, the system comprises a condenser, and the steam turbine, the condenser and the condensate tank are connected in sequence through pipelines. The condenser is preferably an air-cooled condenser.
In the invention, the exhaust steam of the steam turbine is cooled by the condenser to form condensed water, and the condensed water is discharged into the condensed water tank through a pipeline between the condenser and the condensed water tank.
Further, the final stage low pressure heater is arranged separately from the steam exhaust of the generator set. In the invention, the last-stage low-pressure heater is separated from the steam exhaust device of the generator set and is independently arranged, so that the last-stage low-pressure heater and the steam exhaust device are not jointly arranged at a high position, and therefore, the last-stage low-pressure heater is connected with other low-pressure heaters through a pipeline in a drainage gradual self-flowing mode, namely, a drainage outlet of a previous-stage low-pressure heater is connected with a drainage inlet of a next-stage low-pressure heater through a pipeline, drainage flows into the last-stage low-pressure heater in a self-flowing mode step by step, and drainage is discharged into a condensation water tank through a pipeline between the drainage outlet and an. The condensed water tank is filled with other heat sources (hydrophobic or other steam of other equipment, etc.) to supplement oxygen removal. The pipeline connecting structure for draining water between the multistage low-pressure heaters to flow automatically gradually does not use a low-pressure drainage pump, and reduces the energy consumption of the system.
Further, a shutoff valve or a regulating valve is arranged on the pipeline.
In a second aspect, the invention provides a support structure comprising a drainage system of a low-pressure heater of a generator set, wherein the support structure comprises a plurality of support structure layers, and the support structure layer where a condensation water tank is located below the support structure layer where a steam turbine is located.
The support structure comprises a main power house support structure of the generator set.
Further, the support structure layer where the final-stage low-pressure heater is located below the support structure layer where the steam turbine is located.
Furthermore, the support structure layer where the condensation water tank is located below the support structure layer where the final-stage low-pressure heater is located.
Further, the last-stage low-pressure heater and other low-pressure heaters are located on the same support structure layer or located below the support structure layer where the other low-pressure heaters are located.
Furthermore, a hydrophobic pipeline connection structure capable of flowing automatically step by step is adopted between the final-stage low-pressure heater and other low-pressure heaters.
Further, the support structure comprises a concrete frame structure or a steel frame structure.
A schematic view of the support structure of the present invention is shown in fig. 4 of the present invention. The supporting structure 10 comprises a plurality of supporting structure layers, and the supporting structure layers comprise a layer 10-3 where a condensation water tank is located, a layer 10-2 where a final-stage low-pressure heater is located, and a layer 10-1 where a steam turbine is located from bottom to top.
Compared with the prior art, the invention has the following beneficial effects:
according to the system, the hydrophobic water of the low-pressure heater automatically flows into the condensate water tank step by step, a low-pressure hydrophobic pump is avoided, energy consumption caused by the low-pressure hydrophobic pump is reduced, the hydrophobic water can be used as a low-quality heat source to replace most of steam to remove oxygen of the condensate water in the condensate water tank, and the economical efficiency is excellent.
Drawings
The accompanying drawings, which 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 and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a system according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a system according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of a system according to embodiment 3 of the present invention.
Fig. 4 is a schematic view of a support structure provided by the present invention.
Wherein, in the figures, the respective reference numerals:
1-final stage low pressure heater; 2-penultimate low pressure heater; 3-last low-pressure heater of inferior final stage; 4-low pressure cylinder of steam turbine; 5-a condensation water tank; 6-a condensate pump; 7-1 to 7-3 are regulating valves; 8-1 is a shut-off valve; 9-air cooling condenser; 10-a support structure; 1A-a drain outlet of a final stage low-pressure heater; 2A-a hydrophobic outlet of a penultimate low-pressure heater; 2B-penultimate low pressure heater drain inlet; 3A-the drainage outlet of the last low-pressure heater of the penultimate low-pressure heater; 5A-inlet of condensation water tank; 10-1 is a supporting structure layer where the steam turbine is located; 10-2 support structure layers where the final-stage low-pressure heaters are located; 10-3 is a supporting structure layer where the condensed water tank is positioned
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiment is described with reference to the drawings in which only 3 low pressure heaters are shown, but those skilled in the art will appreciate that the number of low pressure heaters is not limited to 3, and that a specific number of low pressure heaters may be provided as needed.
Fig. 1 is a schematic structural diagram of a drainage system of a low-pressure heater of a power generating unit according to embodiment 1 of the present invention, and the drainage system includes a final-stage low-pressure heater 1, a penultimate-stage low-pressure heater 2, a last-stage low-pressure heater 3 of the penultimate-stage low-pressure heater 2, a turbine low-pressure cylinder 4, an air-cooled condenser 9, a condensate water tank 5, and a condensate water pump 6 disposed on a condensate water pipeline. The exhaust steam of the low pressure cylinder 4 of the steam turbine is cooled by the air-cooled condenser 9 to form condensed water, and the condensed water is discharged into the condensed water tank 5 through a pipeline between the air-cooled condenser 9 and the condensed water tank. And a water drainage outlet 1A of the last-stage low-pressure heater 1 and a water drainage outlet 2A of the next-to-last-stage low-pressure heater 2 are respectively connected with an inlet of a condensation water tank 5 through pipelines. The hydrophobic outlet 3A of the low-pressure heater 3 is connected with the hydrophobic inlet 2B of the penultimate low-pressure heater through a pipeline. The pipelines of the system are respectively provided with regulating valves 7-1, 7-2 and 7-3. the system of the embodiment leads the hydrophobic water in the low-pressure heater into the condensation water tank 5 by the pipeline between the hydrophobic outlet of the penultimate low-pressure heater 2 and the inlet of the condensation water tank, avoids using a low-pressure hydrophobic pump, reduces the energy consumption, solves the technical problem of insufficient stepwise hydrophobic pressure, and utilizes the hydrophobic heat to supplement and remove oxygen.
Fig. 2 is a schematic structural diagram of a drainage system of a low-pressure heater of a power generating unit according to embodiment 2 of the present invention, and the drainage system includes a final-stage low-pressure heater 1, a penultimate-stage low-pressure heater 2, a last-stage low-pressure heater 3 of the penultimate-stage low-pressure heater 2, a turbine low-pressure cylinder 4, a condensate tank 5, an air-cooled condenser 9, and a condensate pump 6 disposed on a condensate line.
The exhaust steam of the low pressure cylinder 4 of the steam turbine is cooled by the air-cooled condenser 9 to form condensed water, and the condensed water is discharged into the condensed water tank 5 through a pipeline between the air-cooled condenser 9 and the condensed water tank.
The drain outlet 1A of the last stage low-pressure heater 1, the drain outlet 2A of the next-to-last stage low-pressure heater 2 and the drain outlet 3A of the low-pressure heater 3 are respectively connected with the inlet 5A of the condensation water tank 5 through pipelines. The pipelines are respectively provided with regulating valves 7-1, 7-2 and 7-3. In addition, the drainage outlet 3A of the low-pressure heater 3 is connected with the drainage inlet 2B of the next-final-stage low-pressure heater through other pipelines, and a shut-off valve 8-1 is arranged on the pipeline. When the valve 8-1 is closed, the drain water of the low pressure heater 3 is all drained to the condensate tank 5.
Fig. 3 is a schematic structural diagram of a drainage system of a low-pressure heater of a power generating unit according to embodiment 3 of the present invention, and the drainage system includes a final-stage low-pressure heater 1, a penultimate-stage low-pressure heater 2, a last-stage low-pressure heater 3 of the penultimate-stage low-pressure heater 2, a turbine low-pressure cylinder 4, an air-cooled condenser 9, a condensate water tank 5, and a condensate water pump 6 disposed on a condensate water pipeline. The exhaust steam of the low pressure cylinder 4 of the steam turbine is cooled by an air-cooled condenser 9 to form condensed water, and the condensed water is discharged into a condensed water tank 5 through a pipeline between the air-cooled island and the condensed water tank.
Wherein, the last low-pressure heater 1 is in the same layer with other low-pressure heaters, the low-pressure heater 3, the penultimate low-pressure heater 2 and the last low-pressure heater 1 are connected by a pipeline in a step-by-step drainage mode, namely, a drainage outlet 3A of the low-pressure heater 3 is connected with a drainage inlet 2B of the penultimate low-pressure heater through a pipeline, a drainage outlet 2A of the penultimate low-pressure heater 2 is connected with a drainage inlet 1B of the last low-pressure heater 1 through a pipeline, and a drainage outlet 1A of the last low-pressure heater 1 is connected with an inlet 5A of a condensation water tank 5 through a pipeline.
It should be noted that, unless expressly stated or limited otherwise, the terms "communicate" and "connect" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the present invention, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A steam trap system for a low pressure heater of a power generating unit, comprising:
the steam turbine, the condensate tank and the multistage low pressure heater, the hydrophobic outlet of last low pressure heater among the multistage low pressure heater, the hydrophobic outlet of time last low pressure heater or the hydrophobic outlet of last low pressure heater of time last low pressure heater at least one hydrophobic outlet of water tank's entry linkage with the condensate tank through the pipeline.
2. The system of claim 1, wherein the drain outlet of each of the plurality of stages of low pressure heaters is connected by a conduit to the inlet of the condensate tank.
3. The system of any one of claims 1 to 2, wherein the hydrophobic outlet of at least one of the plurality of low pressure heaters is further connected to the hydrophobic inlet of a next low pressure heater of the at least one low pressure heater by another conduit.
4. The system of claim 1, wherein the condensate tank is separately disposed from a steam exhaust of the power generating unit.
5. The system of claim 1, wherein the final stage low pressure heater is arranged separately from a steam exhaust device of the generator set, and a hydrophobic pipeline connection structure with stage-by-stage self-flow is adopted between the multi-stage low pressure heaters.
6. A support structure comprising a hydrophobic system for a low pressure heater of a genset as claimed in any one of claims 1 to 5 wherein: the steam turbine comprises a plurality of supporting structure layers, wherein the supporting structure layer where the condensation water tank is located below the supporting structure layer where the steam turbine is located.
7. The support structure of claim 6, wherein the final stage low pressure heater is located in a support structure layer below the steam turbine.
8. The support structure of claim 7, wherein the structural layer of condensate tank is below the structural layer of final low pressure heater.
9. The support structure of claim 8, wherein the last stage low pressure heater is located on the same support structure layer as the other low pressure heaters or below the support structure layer on which the other low pressure heaters are located.
10. The support structure of claim 9, wherein a hydrophobic gravity-fed piping connection is provided between the last stage of the low pressure heater and the other low pressure heaters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021053021.7U CN212618236U (en) | 2020-06-10 | 2020-06-10 | Drainage system and supporting structure of low-pressure heater of generator set |
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| CN202021053021.7U CN212618236U (en) | 2020-06-10 | 2020-06-10 | Drainage system and supporting structure of low-pressure heater of generator set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153472A (en) * | 2021-04-19 | 2021-07-23 | 西安交通大学 | Hydrophobic recovery device and method of mixed working medium circulation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153472A (en) * | 2021-04-19 | 2021-07-23 | 西安交通大学 | Hydrophobic recovery device and method of mixed working medium circulation system |
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