CN111122111A - Improved structure of corrugated plate type steam-water separator and performance test method thereof - Google Patents
Improved structure of corrugated plate type steam-water separator and performance test method thereof Download PDFInfo
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- CN111122111A CN111122111A CN201911338298.6A CN201911338298A CN111122111A CN 111122111 A CN111122111 A CN 111122111A CN 201911338298 A CN201911338298 A CN 201911338298A CN 111122111 A CN111122111 A CN 111122111A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims description 11
- 238000011056 performance test Methods 0.000 title claims description 5
- 238000000926 separation method Methods 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/26—Steam-separating arrangements
- F22B37/268—Steam-separating arrangements specially adapted for steam generators of nuclear power plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/38—Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/006—Details of nuclear power plant primary side of steam generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- High Energy & Nuclear Physics (AREA)
- General Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Fluid Mechanics (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
The embodiment of the invention discloses an improved structure of a corrugated plate type steam-water separator and a performance testing method thereof, and relates to the field of nuclear energy equipment. The steam-water separator improves the structure and includes: the corrugated plates are arranged in parallel, an airflow channel is formed between every two corrugated plates, the corrugated plates are provided with staggered wave troughs and wave crests, the improved structure of the steam-water separator comprises a double-hook corrugated plate type steam-water separator, and the double-hook corrugated plate type steam-water separator only has two straight hooks. The embodiment of the invention has the steam-water separation function of high separation efficiency and low flow pressure drop.
Description
Technical Field
The embodiment of the invention relates to the field of nuclear energy equipment, in particular to an improved structure of a corrugated plate type steam-water separator and a performance testing method thereof.
Background
The steam generator is connected with the first loop and the second loop of the pressurized water reactor nuclear power equipment and has the function of transferring the heat of the first loop to the second loop to vaporize water into saturated steam, and then the saturated steam is used for pushing the steam turbine to do work, so that the power output of the nuclear power equipment is realized. The steam-water separation equipment is used as a key device of the steam generator, and plays a role in drying saturated steam and protecting a steam turbine from being impacted by liquid drops. Among them, the corrugated plate type steam-water separation apparatus is often used as a re-drying process of water vapor. In addition, the corrugated plate type steam-water separator is also commonly used for steam-liquid drying in heat energy, chemical engineering and petroleum and natural gas engineering.
Traditional buckled plate formula catch water, the inside crotch adopts the crotch structure of turning back to the separation efficiency of reinforcing separator is expected. The setting of crotch can promote the separation efficiency of separator to a certain extent, but increases the pressure drop of separator by a wide margin simultaneously, causes steam generator's circulation multiplying power to descend, and then endangers nuclear power equipment's safety.
Disclosure of Invention
The embodiment of the invention aims to provide an improved structure of a corrugated plate type steam-water separator and a performance testing method thereof, which are used for solving the problems that the circulation multiplying power of a steam generator is reduced and the overall safety of a pressurized water reactor type nuclear power station is damaged due to high flowing pressure drop of the conventional corrugated plate type steam-water separator.
In order to achieve the above object, the embodiments of the present invention mainly provide the following technical solutions:
in a first aspect, the embodiment of the invention provides an improved structure of a corrugated plate type steam-water separator,
the steam-water separator improves the structure and includes: the corrugated plates are arranged in parallel, an airflow channel is formed between every two corrugated plates, the corrugated plates are provided with staggered wave troughs and wave crests, the improved structure of the steam-water separator comprises a double-hook corrugated plate type steam-water separator, and the double-hook corrugated plate type steam-water separator only has two straight hooks.
Further, two straight hooks are located at positions close to the air inlet of the steam-water separator and are respectively located at second wave troughs of upper corrugated plates of the double-hook corrugated plate type steam-water separator and first wave crests of lower corrugated plates.
Further, the improved structure of the steam-water separator further comprises a lower straight hook type corrugated plate type steam-water separator, the wave troughs and the wave crests of the upper corrugated plate of the lower straight hook type corrugated plate type steam-water separator are both bent hooks, and the wave troughs and the wave crests of the lower corrugated plate of the lower straight hook type corrugated plate type steam-water separator are both straight hooks.
Further, the improved structure of the steam-water separator further comprises an upper straight hook type corrugated plate type steam-water separator, the wave troughs and the wave crests of the upper corrugated plate of the upper straight hook type corrugated plate type steam-water separator are straight hooks, and the wave troughs and the wave crests of the lower corrugated plate of the upper straight hook type corrugated plate type steam-water separator are hooks.
Further, the improved structure of the steam-water separator further comprises a mixed hook type corrugated plate type steam-water separator, and the mixed hook type corrugated plate type steam-water separator comprises two straight hooks and a plurality of hooks.
Further, two straight hooks of the mixed hook type corrugated plate type steam-water separator are respectively positioned at the second wave trough of the upper corrugated plate and the first wave trough of the lower corrugated plate.
Further, the straight hook is a corrugated plate branch portion extending only in one direction.
In a second aspect, the embodiment of the invention further provides a performance test method for the improved structure of the corrugated plate type steam-water separator,
the performance testing method comprises the steps of respectively constructing mathematical physical models of an eating corrugated plate type steam-water separator, a lower corrugated plate type steam-water separator, an upper corrugated plate type steam-water separator, a mixed hook corrugated plate type steam-water separator and the existing corrugated plate type steam-water separator with hooks by adopting a computational fluid mechanics method, and analyzing the separation efficiency and the flow pressure drop of the steam-water separators with five structures under different inlet liquid drop volume fractions.
The technical scheme provided by the embodiment of the invention at least has the following advantages:
the improved structure of the corrugated plate type steam-water separator provided by the embodiment of the invention has the characteristics of simple structure, low cost, high separation efficiency, low pressure drop and flow resistance, and has huge market demand in the field of practical nuclear power.
Drawings
Fig. 1 is a schematic structural diagram of a double hook type corrugated plate steam-water separator according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a steam-water separator with a hook-type corrugated plate in the prior art.
Fig. 3 is a graph for testing the separation efficiency of a corrugated plate type steam-water separator with hooks on droplets with different diameters in the prior art.
Fig. 4 is a schematic structural diagram of a lower straight hook type corrugated plate steam-water separator according to an embodiment of the present invention.
FIG. 5 is a schematic structural view of an upper straight hook type corrugated plate type steam-water separator according to an embodiment of the present invention
Fig. 6 is a schematic structural diagram of a hybrid hook-type corrugated plate steam-water separator according to an embodiment of the present invention.
FIG. 7 shows a volume fraction 10 of liquid droplets at the inlet provided by an embodiment of the present invention-3The separation efficiency test chart of the corrugated plates from the I type to the V type is shown below.
FIG. 8 shows a 5X 10 inlet drop volume fraction provided by an embodiment of the present invention-3The separation efficiency test chart of the corrugated plates from the I type to the V type is shown below.
FIG. 9 shows a volume fraction 10 of liquid droplets at the inlet provided by an embodiment of the present invention-2The separation efficiency test chart of the corrugated plates from the I type to the V type is shown below.
FIG. 10 shows a 5X 10 inlet drop volume fraction provided by an embodiment of the present invention-2The separation efficiency test chart of the corrugated plates from the I type to the V type is shown below.
Fig. 11 is a graph illustrating the separation efficiency of the V-shaped corrugated plate according to the embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, interfaces, techniques, etc. in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Before describing the embodiments of the present invention, a brief introduction will first be made to the technical background of the present invention:
referring to fig. 2, fig. 2 is a structural characteristic of a secondary steam-water separation device, namely, a corrugated plate type steam-water separator with hooks, which is adopted by an existing AP1000 nuclear power station, and is hereinafter referred to as an I-type corrugated plate, a mathematical physical model is constructed on the secondary steam-water separation device by using a computational fluid dynamics method, and separation efficiency and flow pressure drop of the device are analyzed, and the specific measures are as follows:
assuming that the diameter of the liquid drops at the inlet of the separator is in the range of 5 μm to 90 μm, the positions of the liquid drops are uniformly distributed at the inlet of the corrugated plate, and the volume fraction of the liquid drops at the inlet is 10-3，5×10-3、10-2And 5X 10-2With reference to fig. 3, the separation efficiency of the corrugated sheet for liquid droplets of different diameters can be obtained. The test results in fig. 3 can find that: the overall separation efficiency of the I-corrugated plate for the droplets becomes greater as the inlet droplet volume fraction increases. However, for droplets with a diameter of more than 60 μm, the inlet volume fraction is 10-2The separation efficiency is less than 5 x 10 of the inlet volume fraction-3The value of time. On the other hand, as the droplet diameter becomes larger, the separation efficiency increases as a whole. But at an inlet volume fraction of 10-2When the diameter of the liquid droplet is larger than 60 μm, the separation efficiency is rather decreased as the diameter is increased. According to the test results of the positions of the liquid drops in the corrugated plate and the humidity distribution, the bent hooks of the corrugated plate can block the liquid drops, the two bent hooks close to the air inlet play the main role of the liquid drops of the separator, and the single-side bent hook positioned in the middle has a partial separation effect on the liquid drops.
Based on the above conclusion, the embodiment of the present invention provides an improved structure of a corrugated plate type steam-water separator, where the improved structure of the steam-water separator includes: a plurality of corrugated plates arranged in parallel, an airflow channel being formed between every two corrugated plates, said corrugated plates having alternating troughs and crests. The improved structure comprises a lower straight hook type corrugated plate type steam-water separator, an upper straight hook type corrugated plate type steam-water separator, a mixed hook type corrugated plate type steam-water separator and a double hook type corrugated plate type steam-water separator. For convenience of differential description hereinafter, the corrugated plate of the lower straight hook type corrugated plate type steam-water separator is referred to as a type II corrugated plate, the corrugated plate of the upper straight hook type corrugated plate type steam-water separator is referred to as a type III corrugated plate, the corrugated plate of the hybrid hook type corrugated plate type steam-water separator is referred to as a type IV corrugated plate, and the corrugated plate of the dual hook type corrugated plate type steam-water separator is referred to as a type V corrugated plate, respectively. The V-shaped corrugated plate is an improved structure which is preferred in the embodiment of the invention, has the effects of high separation efficiency and low flowing pressure drop, has huge market demands in the field of practical nuclear power, is simple in structure, can simplify the structure of the separator equipment, and can reduce the manufacturing cost in principle.
Specifically, referring to fig. 4, the wave troughs and the wave crests of the upper corrugated plate of the lower straight hook type corrugated plate type steam-water separator are both bent hooks, and the wave troughs and the wave crests of the lower corrugated plate of the lower straight hook type corrugated plate type steam-water separator are both straight hooks.
Referring to fig. 5, the wave troughs and the wave crests of the upper straight hook type corrugated plate type steam-water separator are both straight hooks, and the wave troughs and the wave crests of the lower corrugated plate of the upper straight hook type corrugated plate type steam-water separator are both bent hooks.
Referring to fig. 6, the hybrid hook type corrugated plate type steam-water separator includes two straight hooks and a plurality of bent hooks. Two straight hooks of the mixed hook type corrugated plate type steam-water separator are respectively positioned at the second wave trough of the upper corrugated plate and the first wave trough of the lower corrugated plate.
Referring to fig. 1, the double hook type corrugated plate type steam-water separator has only two straight hooks, and the two straight hooks are located at a position close to an air inlet of the steam-water separator and are respectively located at second wave troughs of upper corrugated plates and first wave crests of lower corrugated plates of the double hook type corrugated plate type steam-water separator.
The straight hook is a corrugated plate branch part extending only in one direction, so that the separation efficiency of the separator is improved, and the pressure drop of the separator is reduced.
Corresponding to the improved structure of the corrugated plate type steam-water separator, the performance test method for the improved structure of the corrugated plate type steam-water separator is provided, and comprises the following steps: a computational fluid mechanics method is adopted to respectively construct mathematical physical models of a double-hook corrugated plate type steam-water separator, a lower straight-hook corrugated plate type steam-water separator, an upper straight-hook corrugated plate type steam-water separator, a mixed hook corrugated plate type steam-water separator and the existing corrugated plate type steam-water separator with hooks, and the separation efficiency and the flow pressure drop of the steam-water separator with five structures are analyzed under different inlet liquid drop volume fractions.
Specifically, the separation efficiency of corrugated sheets of type I to V was measured for droplets of different diameters at different inlet droplet volume fractions, and the results of the measurements are shown in fig. 7, 8, 9 and 10. As can be seen from the figure: the separation efficiency of corrugated sheets of type II to V is almost 100% for droplets having a diameter larger than 30 μm, while the maximum separation efficiency of corrugated sheets of type I is less than 20% for such droplets. For droplets less than 30 μm in diameter, the separation performance is best for type II and type III corrugated sheets, followed by type IV and V corrugated sheets. As can be seen from fig. 7 and 8, the separation efficiency of the corrugated sheets of type II to V for liquid droplets having a diameter of more than 10 μm is almost 100%, while the maximum separation efficiency of the corrugated sheets of type I for such liquid droplets is less than 20%. The separation efficiency of the type II and type III corrugated sheets is approximately 100% for droplets with a diameter of less than 10 μm, while the separation efficiency of the type IV and type V corrugated sheets is also above 85%. As can be seen from the attached FIGS. 9 and 10, the separation efficiency of the corrugated plates from the II type to the V type can approach or reach 100% for liquid drops in the whole diameter range; whereas the type I corrugated sheet increases the separation efficiency from 45% to 80% only for droplets in this range.
See table 1 for total pressure drop at the inlet and outlet of corrugated sheets type I to V:
TABLE 1
As can be seen from table 1: wherein the pressure drop of the II type corrugated plate and the III type corrugated plate is highest and reaches 3300 Pa; the pressure drop of the corrugated plates of the I type and the V type is the lowest, and the magnitude of the pressure drop is less than 1350 Pa. From the results of fig. 7, fig. 8, fig. 9, fig. 10 and table 1, it can be seen that although the separation efficiency of the type II and III corrugated plates is high, their pressure drop is also high; the performance of IV type buckled plate is middle, and the separation efficiency of V type buckled plate is not as good as II type and III type buckled plate, but the separation efficiency is far greater than I type buckled plate, and the pressure drop of V type buckled plate is lower, and its size is only about one-third of II type and III type buckled plate.
Referring again to fig. 11, it can be seen that the V-corrugated plate has good separation efficiency at various inlet liquid drop volume fractions, and therefore, the double hook corrugated plate steam-water separator composed of the V-corrugated plate and the V-corrugated plate is the preferred structure of the present embodiment, but the II-corrugated plate, the III-corrugated plate and the IV-corrugated plate are all within the protection scope of the present application. Compared with the traditional corrugated plate type steam-water separator with hooks, the double-hook corrugated plate type steam-water separator has the advantages of simple structure, high separation efficiency, low pressure drop and flow resistance.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a buckled plate formula steam-water separator improves structure which characterized in that, steam-water separator improves the structure and includes: the corrugated plates are arranged in parallel, an airflow channel is formed between every two corrugated plates, the corrugated plates are provided with staggered wave troughs and wave crests, the improved structure of the steam-water separator comprises a double-hook corrugated plate type steam-water separator, and the double-hook corrugated plate type steam-water separator only has two straight hooks.
2. The improved corrugated plate steam-water separator structure of claim 1, wherein the two straight hooks are located near the air inlet of the steam-water separator and are respectively located at the second wave troughs of the upper corrugated plate and the first wave crests of the lower corrugated plate of the double-hook corrugated plate steam-water separator.
3. The improved corrugated plate type steam-water separator structure of claim 1, further comprising a lower straight hook type corrugated plate type steam-water separator, wherein the wave troughs and wave crests of the upper corrugated plate of the lower straight hook type corrugated plate type steam-water separator are both bent hooks, and the wave troughs and wave crests of the lower corrugated plate of the lower straight hook type corrugated plate type steam-water separator are both straight hooks.
4. The improved corrugated plate type steam-water separator structure of claim 1, further comprising an upper straight hook type corrugated plate type steam-water separator, wherein the wave troughs and wave crests of the upper corrugated plate of the upper straight hook type corrugated plate type steam-water separator are straight hooks, and the wave troughs and wave crests of the lower corrugated plate of the upper straight hook type corrugated plate type steam-water separator are bent hooks.
5. The improved corrugated plate steam-water separator structure of claim 1, further comprising a hybrid hook-type corrugated plate steam-water separator, wherein the hybrid hook-type corrugated plate steam-water separator comprises two straight hooks and a plurality of curved hooks.
6. The improved corrugated plate steam-water separator structure of claim 5, wherein the two straight hooks of the mixed hook corrugated plate steam-water separator are respectively positioned at the second wave troughs of the upper corrugated plate and the first wave troughs of the lower corrugated plate.
7. The improved corrugated plate steam-water separator structure of claim 1, wherein said straight hook is a corrugated plate branch extending in only one direction.
8. A performance test method for an improved structure of a corrugated plate type steam-water separator is characterized by comprising the steps of respectively constructing a double-hook corrugated plate type steam-water separator, a lower straight-hook corrugated plate type steam-water separator, an upper straight-hook corrugated plate type steam-water separator, a mixed-hook corrugated plate type steam-water separator and a mathematical physical model of the conventional corrugated plate type steam-water separator by adopting a computational fluid dynamics method, and analyzing the separation efficiency and the flow pressure drop of the five structures of steam-water separators under different inlet liquid drop volume fractions.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551388A (en) * | 2020-06-01 | 2020-08-18 | 上海交通大学 | Test system for testing separation performance of corrugated plate assembly of moisture separator reheater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111551388A (en) * | 2020-06-01 | 2020-08-18 | 上海交通大学 | Test system for testing separation performance of corrugated plate assembly of moisture separator reheater |
| CN111551388B (en) * | 2020-06-01 | 2024-05-14 | 上海交通大学 | Test system for testing separation performance of wave plate assembly of steam-water separation reheater |
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Application publication date: 20200508 |