CN212131708U - Drainage near T-shaped pipe of three-section type heat regenerative system - Google Patents
Drainage near T-shaped pipe of three-section type heat regenerative system Download PDFInfo
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- CN212131708U CN212131708U CN202020622866.7U CN202020622866U CN212131708U CN 212131708 U CN212131708 U CN 212131708U CN 202020622866 U CN202020622866 U CN 202020622866U CN 212131708 U CN212131708 U CN 212131708U
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Abstract
The utility model discloses a hydrophobic nearly T type pipe of syllogic backheating system, the utility model discloses adopt first section for entry straight tube section structure in the hydrophobic return bend department of thermodynamic system, connect the little loudspeaker type gradual expansion pipe section structure of second section behind the entry straight tube section structure, the structural third section hyperbolic type outlet pipe structure that is provided with of entry straight tube section, the end of the little loudspeaker type gradual expansion pipe section structure is provided with the hemisphere bowl type retaining head that can dismantle, this structure replaces traditional carbon steel return bend structure, can effectively reduce the discrete erosion momentum of dripping the return bend in the vapour liquid two-phase flow, the life of reinforcing pipeline, promote the safety and stability nature of unit operation.
Description
Technical Field
The utility model belongs to large-scale thermal generator set thermodynamic system transmission field that flows, concretely relates to hydrophobic nearly T type pipe of syllogic backheating system.
Background
The regenerative cycle is widely adopted in the design of the current large-scale thermal power plant system, and is realized by configuring a water supply heater. Feedwater heaters are important devices to improve the economics of thermal power plants. The extracted steam of the steam turbine is heated by the heater tube bundle to feed water and condensed water and then condensed to form hydrophobic water. Drainage of each level of heater sequentially flows and converges into lower level heating step by step due to different working pressures, and finally converges into a condenser. In the drainage gravity flow pipeline of the heater, a drainage regulating valve is usually arranged to ensure the balance relation of the water levels of the heaters.
In the current engineering design, due to factors such as the model selection design, installation and manufacturing of the drain control valve, the drain control valve can be gasified due to the rapid pressure drop in the process of flowing in the next high-level process, and the phenomenon that two phases of gas and liquid flow simultaneously is formed. At present, under the influence of factors such as power peak regulation and the like, when the generator set runs under low partial load, the pressure difference between extraction steam of each stage is reduced, the motive power of the heater in a drainage and self-flow mode is weakened, and the flow characteristic of steam-liquid two-phase flow is more easily generated.
When the drain thermodynamic system pipeline behind the drain regulating valve is provided with the elbow structure, the flow direction of the discrete high-speed phase in the two-phase flow cannot be changed due to inertia, and the discrete high-speed phase directly impacts the inner wall surface of the elbow, so that obvious erosion impact is caused on the bend of the downstream pipeline. As the steam trap usually adopts a carbon steel structure with low cost and pressure-resistant grade, under the impact of two-phase flow discrete drops, the steam trap of the thermodynamic system is frequently abraded and even cracked, thus endangering the safety of the unit.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned not enough, provide a hydrophobic nearly T type pipe of syllogic backheat system, can show improvement unit heating power hydrophobic system stability, guarantee heating power system soda circulation quality has reduced and has taken place the phase transition because of in the pipeline and cause the hydrophobic structure life-span to shorten, and then endangers unit operation safety, is of value to promoting unit operation security.
In order to achieve the purpose, the utility model discloses an entry straight tube section structure is connected with loudspeaker type divergent pipe section structure a little behind the entry straight tube section structure, and the entry straight tube section structure is provided with hyperbolic type outlet pipe structure, and the entry orientation of hyperbolic type outlet pipe structure loudspeaker type divergent pipe section structure a little is provided with triangle-shaped micro-vortex generator on the interior pipe wall of mouth straight tube section structure, and the end of loudspeaker type divergent pipe section structure a little is provided with the hemisphere bowl type retaining head that can dismantle.
The triangular micro-vortex generator is axially parallel to the flow direction of the pipeline.
The triangular micro-vortex generators are a plurality of micro-vortex generators with triangular structures, and all the micro-vortex generators are arranged on the inner pipe wall of the inlet of the straight pipe section structure at equal angles.
The hemispherical bowl type water storage end socket is arranged at the tail end of the micro-horn type gradually-expanding pipe section structure through a flange.
The structure of the micro-trumpet-shaped gradually-expanding pipe section is a trumpet-shaped gradually-expanding structure.
The lower part of the hyperbolic outlet pipe structure and the inlet straight pipe section structure are in a hyperbolic shape in a penetrating interval, and the upper pipe section of the hyperbolic outlet pipe structure is formed by hyperbolic tangent lines.
The diameter of the hemispherical bowl type water storage end socket is larger than that of the tail end of the micro-trumpet type gradually-expanded pipe section structure.
The transition section at the tail end of the structures of the ball bowl type water storage end socket and the micro-trumpet type gradually-expanding pipe section is in a step form.
Compared with the prior art, the utility model discloses adopt first section entry straight tube section structure in the hydrophobic return bend department of thermodynamic system, connect the little loudspeaker type gradual expansion pipe section structure of second section behind the entry straight tube section structure, the structural third section hyperbolic type outlet pipe structure that is provided with of entry straight tube section, the end of the little loudspeaker type gradual expansion pipe section structure is provided with the hemisphere bowl type retaining head that can dismantle, replace traditional carbon steel elbow structure, effectively reduced in the vapour-liquid two-phase flow discrete the erosion momentum of dripping to the return bend, the life of pipeline has been strengthened, the safety and stability of unit operation has been promoted.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the present invention;
fig. 3 is a top view of the present invention;
fig. 4 is a left side view of the present invention;
fig. 5 is a cross-sectional view of the present invention;
FIG. 6 is a schematic view of the bowl-shaped water storage head of the present invention;
FIG. 7 is a schematic diagram of a medium triangular micro-vortex generator according to the present invention;
wherein, 1, an inlet straight pipe section structure; 2. a micro-horn type gradually-expanded pipe section structure; 3. a hyperbolic outlet pipe structure; 4. a triangular micro-vortex generator; 5. hemispherical bowl type water storage end socket.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1 to 5, the utility model discloses an entry straight tube section structure 1 is connected with a little loudspeaker type divergent pipe structure 2 behind the entry straight tube section structure 1, a little loudspeaker type divergent pipe structure 2 is trumpet-shaped divergent type structure, be provided with hyperbolic type outlet pipe structure 3 on the entry straight tube section structure 1, the entry orientation of hyperbolic type outlet pipe structure 3 is a little loudspeaker type divergent pipe structure 2, be provided with the little vortex generator 4 of triangle-shaped on the interior pipe wall of mouth straight tube section structure 1, the end of a little loudspeaker type divergent pipe structure 2 is provided with hemisphere bowl type retaining head 5 that can dismantle. The lower part of the hyperbolic outlet pipe structure 3 and the inlet straight pipe section structure 1 are in a hyperbolic intersecting section, and the upper pipe section of the hyperbolic outlet pipe structure 3 is formed by hyperbolic tangent lines.
Referring to fig. 6, the hemispherical bowl type water storage end enclosure 5 is installed at the end of the micro-trumpet type divergent pipe section structure 2 through a flange. The diameter of the hemispherical bowl type water storage end socket 5 is larger than that of the tail end of the micro-trumpet type gradually-expanded pipe section structure 2. The transition section between the ball bowl type water storage end socket 5 and the tail end of the micro-trumpet type gradually-expanding pipe section structure 2 is in a step form.
Referring to fig. 7, the triangular micro-vortex generators 4 are axially parallel to the direction of the pipe flow. The triangular micro-vortex generators 4 are a plurality of micro-vortex generators with triangular structures, and all the micro-vortex generators are arranged on the inner pipe wall of the inlet of the straight pipe section structure 1 at equal angles.
The utility model discloses a set up triangle-shaped micro-vortex generator 4 at traditional entry straight tube section structure 1's internal face, great discrete structure striking of dripping is stretched behind micro-vortex generator, broken, separation formation little secondary liquid drop and slug-wave form flow, cyclic annular-diffuse flow class backward flow vortex, directly weakens the initial impact momentum of dispersion phase. The rear of an inlet straight pipe section structure 1 is connected with a micro-trumpet-shaped gradually-expanded pipe section structure 2, and after steam and water flow through the gradually-expanded pipe section, continuous phase expansion and discrete phase deceleration are carried out, so that the kinetic energy of incident liquid drops at the bent pipe is further weakened. Meanwhile, the detachable stainless steel hemispherical bowl type water storage end socket 5 is additionally arranged at the tail end of the pipeline, so that on one hand, the impact force of incident liquid drops is matched by only improving the performance of a local hemispherical bowl type sealing end plug material, and the cost increase caused by integrally replacing a lifting bent pipe material is avoided; on the other hand, the hemispherical bowl type water storage seal head 5 is arranged to be of a flange mounting detachable structure, so that the flexibility of mounting and maintenance can be still met for the whole pipeline even if the seal head is corroded to lose efficacy under extremely severe working conditions. In addition, the diameter of the hemispherical bowl type water storage end socket 5 is larger than the terminal of the micro-trumpet type gradually-expanded pipe section, and the end socket is also of an expansion structure, so that the impact energy of two-phase fluid can be continuously reduced. Finally, the outlet pipeline is optimized through flow field analysis and calculation, an inclined countercurrent three-way structure is formed in a hyperbolic mode, discrete droplets in inlet incoming flow cannot directly impact the outlet pipeline to form an erosion area, and meanwhile the discrete droplets in a vortex backflow area after impacting and sealing the plug are enabled to enter a downstream pipeline in a downstream mode, so that the impact momentum of the discrete droplets is further reduced, the erosion of the two-phase flow discrete droplets to the pipeline is finally reduced, and the purpose of guaranteeing the operation safety of a thermodynamic system is achieved.
The inlet straight pipe section is provided with a triangular micro-vortex generator, the axial direction of the vortex generator is parallel to the flow direction of the pipeline, and the inlet is periodically arranged along the circumferential surface of the pipeline. The number range of the cycles of the triangular micro-vortex generators is 4-8, the windward angle range of the triangle is 30-60 degrees, and the triangular micro-vortex generators are selected according to numerical simulation optimization.
The extension section behind the inlet pipeline, namely the second section of pipeline, is processed into a micro-trumpet-shaped gradually-expanded pipe section structure 2. And the area scaling ratio of the inlet and the outlet of the divergent channel, the convergent line scaling angle and the initial divergent position of the divergent line are determined by numerical simulation optimization according to the minimum flow loss as an optimization target, and the micro loudspeaker divergent line adopts a cubic Bessel curve.
B(t)＝P0(1-t)3+3P1t(1-t)2+3P2t2(1-t)+P3t3,t∈[0,1] (1)
The hemispherical bowl type sealing plug 5 is arranged at the tail end of the micro-horn type gradually-expanded pipe section structure 2 and is connected with the micro-horn type gradually-expanded pipe section structure 2 through a flange, and the diameter of the hemispherical bowl type water storage plug 5 is larger than that of the tail end of the micro-horn type gradually-expanded pipe section structure 2.
REnd socket＝RGradually-expanding terminal+ΔR (2)
Wherein: Δ R ranges from 5-25 mm;
the outlet pipe section and the inlet pipe section form an inclined countercurrent three-way structure, the intersecting section of the lower part of the hyperbolic outlet pipe structure 3 and the inlet straight pipe section structure 1 is hyperbolic, the upper pipe section of the hyperbolic outlet pipe structure 3 is formed by hyperbolic tangent lines, the hyperbolic curve is generated by an equation (3), and the numerical value of the axial starting position of the hyperbolic section is determined after optimization through simulation.
x2/a2-y2/b2＝1 (3)
The drainage near T-shaped pipe structure of the three-section type regenerative system can effectively improve the erosion abrasion of liquid drops of two-phase flow of a drainage pipeline to the pipeline, improve the stability of a thermodynamic drainage system of a unit, ensure the steam-water circulation quality of the thermodynamic system, and further improve the safety of the unit.
Claims (8)
1. The utility model provides a three-section type backheating system drainage nearly T type pipe, its characterized in that, including entry straight tube section structure (1), be connected with behind entry straight tube section structure (1) little loudspeaker type divergent pipe section structure (2), be provided with hyperbolic type outlet pipe structure (3) on entry straight tube section structure (1), the entry of hyperbolic type outlet pipe structure (3) is towards little loudspeaker type divergent pipe section structure (2), be provided with little vortex generator (4) of triangle-shaped on the inner tube wall of mouth straight tube section structure (1), the end of little loudspeaker type divergent pipe section structure (2) is provided with hemisphere bowl type retaining head (5) that can dismantle.
2. The hydrophobic near-T-shaped pipe of the three-stage regenerative system according to claim 1, wherein the triangular micro-vortex generator (4) is axially parallel to the flow direction of the pipeline.
3. The hydrophobic near-T-shaped pipe of the three-section type regenerative system according to claim 1, wherein the triangular micro-vortex generators (4) are a plurality of micro-vortex generators with triangular structures, and all the micro-vortex generators are arranged on the inner pipe wall of the inlet of the straight pipe section structure (1) at equal angles.
4. The drainage near T-shaped pipe of the three-section type heat recovery system according to claim 1, wherein the hemispherical bowl type water storage end socket (5) is installed at the tail end of the trumpet type divergent pipe section structure (2) through a flange.
5. The drainage near T-shaped pipe of the three-stage regenerative system according to claim 1, wherein the micro-trumpet-shaped divergent pipe section structure (2) is a trumpet-shaped divergent structure.
6. The drainage near-T-shaped pipe of the three-section type regenerative system according to claim 1, wherein a penetration section between a lower portion of the hyperbolic outlet pipe structure (3) and the inlet straight pipe structure (1) is hyperbolic, and an upper pipe section of the hyperbolic outlet pipe structure (3) is formed by hyperbolic tangent lines.
7. The drainage near-T-shaped pipe of the three-section type regenerative system according to claim 1, wherein the diameter of the hemispherical bowl-shaped water storage end socket (5) is larger than the diameter of the tail end of the micro-trumpet-shaped gradually-expanded pipe section structure (2).
8. The drainage near-T-shaped pipe of the three-section type heat recovery system according to claim 1, wherein a transition section between the ball-bowl-shaped water storage end socket (5) and the tail end of the micro-horn-shaped gradually-expanded pipe section structure (2) is in a step form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020622866.7U CN212131708U (en) | 2020-04-22 | 2020-04-22 | Drainage near T-shaped pipe of three-section type heat regenerative system |
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| CN202020622866.7U CN212131708U (en) | 2020-04-22 | 2020-04-22 | Drainage near T-shaped pipe of three-section type heat regenerative system |
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| CN212131708U true CN212131708U (en) | 2020-12-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027554A (en) * | 2021-03-15 | 2021-06-25 | 西安西热节能技术有限公司 | Inlet structure of drainage cooling section of dual-channel heater and design method |
| CN113431974A (en) * | 2021-07-30 | 2021-09-24 | 西安热工研究院有限公司 | Pipeline structure capable of preventing scouring and accelerated corrosion due to flowing and changing flow direction of fluid |
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2020
- 2020-04-22 CN CN202020622866.7U patent/CN212131708U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027554A (en) * | 2021-03-15 | 2021-06-25 | 西安西热节能技术有限公司 | Inlet structure of drainage cooling section of dual-channel heater and design method |
| CN113431974A (en) * | 2021-07-30 | 2021-09-24 | 西安热工研究院有限公司 | Pipeline structure capable of preventing scouring and accelerated corrosion due to flowing and changing flow direction of fluid |
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