CN217109637U - Structure for preventing cavitation of air preheater condensed water pipeline - Google Patents
Structure for preventing cavitation of air preheater condensed water pipeline Download PDFInfo
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- CN217109637U CN217109637U CN202220867357.XU CN202220867357U CN217109637U CN 217109637 U CN217109637 U CN 217109637U CN 202220867357 U CN202220867357 U CN 202220867357U CN 217109637 U CN217109637 U CN 217109637U
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Abstract
The utility model discloses a prevent structure of air preheater condensate pipe cavitation, have: a primary air preheater of the boiler; the high-pressure steam inlet and the low-pressure steam inlet are respectively connected to a primary air preheater of the boiler; the high-pressure steam inlet passes through the primary air preheater of the boiler to form a high-pressure drain pipe; the low-pressure steam inlet passes through the primary air preheater of the boiler to form a low-pressure drain pipe; the high-pressure drain pipe is communicated with the drainage flash tank; the pressure-reducing drain pipe is arranged on the drain flash tank; the deaerator, decompression drain pipe and low pressure drain pipe and deaerator intercommunication reduce high-pressure section condensation water pressure, prevent to produce the cavitation phenomenon from drainage flash vessel to deaerator pipeline.
Description
Technical Field
The utility model belongs to the technical field of the boiler, especially, relate to a prevent structure of air preheater condensate pipe cavitation.
Background
In the process of implementing the present invention, the inventor finds that the prior art has at least the following problems:
the water pressure of the primary air preheater high-pressure section condensed water of the boiler in the garbage power plant is about 6.4MPaG, the pressure is higher, the working pressure of the thermal deaerator is 0.17MPaG, if the air preheater high-pressure section condensed water is directly connected to the deaerator, the pressure difference between the condensed water outlet of the air preheater high-pressure section and the deaerator is larger, the flow speed in a condensed water pipeline is too fast, and the cavitation phenomenon is easily generated in the pipeline. Meanwhile, because the pressure is too high, the deaerator can generate the phenomena of vibration, water seepage and the like, and the stable operation of the unit is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a reduce high-pressure section condensate water pressure prevents to produce the cavitation's of cavitation prevention ware condensate water piping cavitation's structure from hydrophobic flash vessel to oxygen-eliminating device pipeline.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a structure for preventing cavitation of a condensed water pipe of an air preheater comprises:
a primary air preheater of the boiler;
the high-pressure steam inlet and the low-pressure steam inlet are respectively connected to the primary air preheater of the boiler;
the high-pressure steam inlet passes through the primary air preheater of the boiler to form a high-pressure drain pipe;
the low-pressure steam inlet passes through the primary air preheater of the boiler to form a low-pressure drain pipe;
the high-pressure drain pipe is communicated with the drain flash tank;
the pressure reduction drain pipe is arranged on the drain flash tank;
and the pressure reduction drain pipe and the low-pressure drain pipe are communicated with the deaerator.
And the drain flash tank is also provided with a steam return pipe, and the steam return pipe is communicated with the low-pressure steam inlet.
The working pressure of the deaerator is 0.17 MPaG.
And the high-pressure drain pipe, the low-pressure drain pipe and the pressure-reducing drain pipe are all provided with valve bodies.
One of the technical schemes has the advantages or beneficial effects that the pressure of the condensed water at the high-pressure section is reduced, and the cavitation phenomenon generated from the drainage flash tank to the deaerator pipeline is prevented.
Drawings
Fig. 1 is a schematic diagram illustrating the result of the structure for preventing cavitation of the condensed water pipeline of the air preheater provided in the embodiment of the present invention;
the labels in the above figures are: 1. boiler primary air preheater, 2, high-pressure steam entry, 3, low pressure steam entry, 4, high-pressure drain pipe, 5, hydrophobic flash vessel, 6, decompression drain pipe, 7, steam return pipe, 8, low pressure drain pipe, 9, oxygen-eliminating device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the structure for preventing cavitation of the condensed water pipe of the air preheater includes: a primary air preheater of the boiler; the high-pressure steam inlet and the low-pressure steam inlet are respectively connected to a primary air preheater of the boiler; high pressure steam and low pressure steam enter the boiler through a high pressure steam inlet and a low pressure steam inlet, respectively. The high-pressure steam inlet passes through the primary air preheater of the boiler to form a high-pressure drain pipe; the low-pressure steam inlet passes through the primary air preheater of the boiler to form a low-pressure drain pipe; the pressure of the condensed water at the high-pressure section of the primary air preheater of the boiler is about 6.4MPaG, and the pressure is higher.
The high-pressure drain pipe is communicated with the drainage flash tank; the pressure-reducing drain pipe is arranged on the drain flash tank; the working pressure of the drainage flash tank is the same as that of the low-pressure section (1.5MPaG), so that the condensed water pressure of the high-pressure section is reduced, and the cavitation phenomenon of a pipeline from the drainage flash tank to the deaerator is prevented.
The deaerator, the pressure-reducing drain pipe and the low-pressure drain pipe are communicated with the deaerator. The deaerator working pressure was 0.17 MPaG.
The drain flash tank is also provided with a steam return pipe which is communicated with the low-pressure steam inlet. Meanwhile, the steam generated by the drainage flash tank is connected back to the steam inlet of the low-pressure section of the air preheater for recycling, so that the steam extraction amount of the steam turbine set is reduced.
The high-pressure drain pipe, the low-pressure drain pipe and the pressure-reducing drain pipe are all provided with valve bodies for controlling the on-off of pipelines.
In order to prevent cavitation erosion of the condensate pipeline of the air preheater, a drain flash tank (shown in figure 1) is added at the outlet of the condensate pipeline of the high-pressure section of the air preheater, and the working pressure is the same as that of the low-pressure section (1.5MPaG), so that the condensate water pressure of the high-pressure section is reduced, and the cavitation erosion phenomenon of the pipeline from the drain flash tank to the deaerator is prevented. Meanwhile, the steam generated by the drainage flash tank is connected back to the steam inlet of the low-pressure section of the air preheater for recycling, so that the steam extraction amount of the steam turbine set is reduced.
After adopting foretell structure, reduce high-pressure section condensation water pressure, prevent to produce the cavitation phenomenon from hydrophobic flash vessel to oxygen-eliminating device pipeline.
In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A structure for preventing cavitation of a condensed water pipeline of an air preheater is characterized by comprising:
a primary air preheater of the boiler;
the high-pressure steam inlet and the low-pressure steam inlet are respectively connected to the primary air preheater of the boiler;
the high-pressure steam inlet passes through the primary air preheater of the boiler to form a high-pressure drain pipe;
the low-pressure steam inlet passes through the primary air preheater of the boiler to form a low-pressure drain pipe;
the high-pressure drain pipe is communicated with the drain flash tank;
the pressure reduction drain pipe is arranged on the drain flash tank;
and the pressure-reducing drain pipe and the low-pressure drain pipe are communicated with the deaerator.
2. The structure for preventing cavitation of a condensed water pipe of an air preheater as claimed in claim 1, wherein a steam return pipe is further provided on the drain flash tank, and the steam return pipe is communicated with the low-pressure steam inlet.
3. The structure for preventing cavitation of a condensed water pipe of an air preheater as recited in claim 2, wherein the deaerator has an operating pressure of 0.17 MPaG.
4. The structure for preventing cavitation erosion of a condensed water pipe of an air preheater as recited in claim 3, wherein the high-pressure drain pipe, the low-pressure drain pipe and the pressure-reducing drain pipe are provided with valve bodies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220867357.XU CN217109637U (en) | 2022-04-14 | 2022-04-14 | Structure for preventing cavitation of air preheater condensed water pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220867357.XU CN217109637U (en) | 2022-04-14 | 2022-04-14 | Structure for preventing cavitation of air preheater condensed water pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217109637U true CN217109637U (en) | 2022-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220867357.XU Active CN217109637U (en) | 2022-04-14 | 2022-04-14 | Structure for preventing cavitation of air preheater condensed water pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217109637U (en) |
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2022
- 2022-04-14 CN CN202220867357.XU patent/CN217109637U/en active Active
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