CN111412339A - Drainage near T-shaped pipe of three-section type regenerative system and design method - Google Patents

Drainage near T-shaped pipe of three-section type regenerative system and design method Download PDF

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Publication number
CN111412339A
CN111412339A CN202010322978.5A CN202010322978A CN111412339A CN 111412339 A CN111412339 A CN 111412339A CN 202010322978 A CN202010322978 A CN 202010322978A CN 111412339 A CN111412339 A CN 111412339A
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China
Prior art keywords
pipe
micro
section structure
type
pipe section
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CN202010322978.5A
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Chinese (zh)
Inventor
高庆
屈杰
居文平
朱蓬勃
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Thermal Power Research Institute
Xian Xire Energy Saving Technology Co Ltd
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Application filed by Thermal Power Research Institute, Xian Xire Energy Saving Technology Co Ltd filed Critical Thermal Power Research Institute
Priority to CN202010322978.5A priority Critical patent/CN111412339A/en
Publication of CN111412339A publication Critical patent/CN111412339A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/027—Throttle passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L43/00—Bends; Siphons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines

Abstract

The invention discloses a three-section type regenerative system drainage near T-shaped pipe, which is adopted at a thermal system drainage elbow, wherein a first section is an inlet straight pipe section structure, a second section of micro-horn type divergent pipe section structure is connected behind the inlet straight pipe section structure, a third section of double-curved outlet pipe structure is arranged on the inlet straight pipe section structure, and a detachable hemispherical bowl type water storage end socket is arranged at the tail end of the micro-horn type divergent pipe section structure.

Description

Drainage near T-shaped pipe of three-section type regenerative system and design method
Technical Field
The invention belongs to the field of flow transmission of a thermodynamic system of a large thermal generator set, and particularly relates to a three-section type regenerative system drainage near T-shaped pipe and a design method.
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
The invention aims to overcome the defects and provides a drainage near T-shaped pipe of a three-section type regenerative system and a design method, which can obviously improve the stability of a thermal drainage system of a unit, ensure the steam-water circulation quality of the thermal system, reduce the service life shortening of the drainage structure caused by the phase change of working media in a pipeline, further endanger the operation safety of the unit and are beneficial to improving the operation safety of the unit.
In order to achieve the purpose, the drain near T-shaped pipe of the three-section type heat recovery system comprises an inlet straight pipe section structure, a micro-horn type gradually-expanded pipe section structure is connected behind the inlet straight pipe section structure, a double-curved outlet pipe structure is arranged on the inlet straight pipe section structure, the inlet of the double-curved outlet pipe structure faces towards the micro-horn type gradually-expanded pipe section structure, a triangular micro-vortex generator is arranged on the inner pipe wall of the outlet straight pipe section structure, and a hemispherical bowl type water storage sealing head capable of being detached is arranged at the tail end of the micro-horn type gradually-expanded pipe section structure.
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.
A design method of a drain near T-shaped pipe of a three-section type regenerative system is characterized in that a triangular micro-vortex generator is arranged on the inner pipe wall of an inlet straight pipe section structure;
designing an inlet-outlet area scaling ratio, a reducing line scaling angle and a gradually-expanding line initial expansion position of a micro-horn-shaped gradually-expanding pipe section structure according to the size and the requirement of an inlet straight pipe section structure, and designing a hemispherical bowl-shaped water storage end socket at the end part of the micro-horn-shaped gradually-expanding pipe section structure to enable the diameter of the hemispherical bowl-shaped water storage end socket to be larger than the diameter of the tail end of the micro-horn-shaped gradually-expanding pipe section structure;
the hyperbolic outlet pipe structure is designed on the axial surface of the inlet straight pipe section structure, the intersecting section of the lower part of the hyperbolic outlet pipe structure and the inlet straight pipe section structure is hyperbolic, and the upper pipe section of the hyperbolic outlet pipe structure is formed by hyperbolic tangent lines.
4-8 micro-vortex generators in the triangular micro-vortex generators, wherein the wind angle range of the micro-vortex generators is 30-60 degrees;
the divergent line of the structure of the micro-trumpet-shaped divergent pipe section adopts a cubic Bessel curve;
the hyperbola of the hyperbolic outlet duct structure is generated by a hyperbolic equation.
Compared with the prior art, the first section of the drain elbow of the thermodynamic system is an inlet straight pipe section structure, the second section of the micro-horn type gradually-expanding pipe section structure is connected behind the inlet straight pipe section structure, the third section of the hyperbolic outlet pipe structure is arranged on the inlet straight pipe section structure, and the tail end of the micro-horn type gradually-expanding pipe section structure is provided with the detachable hemispherical bowl type water storage end socket instead of the traditional carbon steel elbow structure, so that the erosion momentum of discrete drops in a gas-liquid two-phase flow to the elbow is effectively reduced, the service life of a pipeline is prolonged, and the safety and stability of unit operation are improved.
The method can independently design the inlet straight pipe section structure, the micro-trumpet-shaped gradually-expanded pipe section structure and the hyperbolic outlet pipe structure, so that the three-section type heat-regenerative system drain near T-shaped pipe is formed.
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 a bowl-shaped water storage head according to the present invention;
FIG. 7 is a schematic diagram of a 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 invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 5, the invention comprises an inlet straight pipe section structure 1, a micro-trumpet-shaped gradually-expanding pipe section structure 2 is connected behind the inlet straight pipe section structure 1, the micro-trumpet-shaped gradually-expanding pipe section structure 2 is a trumpet-shaped gradually-expanding structure, a hyperbolic outlet pipe structure 3 is arranged on the inlet straight pipe section structure 1, the inlet of the hyperbolic outlet pipe structure 3 faces the micro-trumpet-shaped gradually-expanding pipe section structure 2, a triangular micro-vortex generator 4 is arranged on the inner pipe wall of the inlet straight pipe section structure 1, and a detachable hemispherical bowl-shaped water storage end enclosure 5 is arranged at the tail end of the micro-trumpet-shaped gradually-expanding pipe section structure 2. 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.
According to the invention, the triangular micro-vortex generator 4 is arranged on the inner wall surface of the traditional inlet straight pipe section structure 1, and a larger discrete droplet structure is stretched, crushed and separated after impacting the micro-vortex generator to form small secondary droplets and backflow vortexes such as slug-wave flow, annular-wave flow and annular-dispersed flow, so that the initial impact momentum of a discrete phase is directly weakened. 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 (10)

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 triangle-shaped little vortex generator (4) on the inner tube wall of entry 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.
9. A design method of a three-stage regenerative system drainage near T-shaped pipe according to claim 1, characterized in that a triangular micro-vortex generator (4) is arranged on the inner pipe wall of the inlet straight pipe section structure (1);
according to the size and the requirement of the inlet straight pipe section structure (1), designing the inlet-outlet area scaling ratio, the reducing line scaling angle and the gradual expansion line initial expansion position of the micro-horn type gradual expansion pipe section structure (2), and designing a hemispherical bowl type water storage end socket (5) at the end part of the micro-horn type gradual expansion pipe section structure (2) to ensure that the diameter of the hemispherical bowl type water storage end socket (5) is larger than the diameter of the tail end of the micro-horn type gradual expansion pipe section structure (2);
a hyperbolic outlet pipe structure (3) is designed on the axial surface of the inlet straight pipe section structure (1), the intersecting section of the lower part of the hyperbolic outlet pipe structure (3) and the inlet straight pipe section structure (1) is hyperbolic, and the upper pipe section of the hyperbolic outlet pipe structure (3) is formed by hyperbolic tangent lines.
10. The design method of the three-stage regenerative system drainage near T-shaped pipe according to claim 9, wherein 4-8 micro-vortex generators are arranged in the triangular micro-vortex generator (4), and the wind angle range of the micro-vortex generators is 30-60 degrees;
the divergent line of the micro-trumpet-shaped divergent pipe section structure (2) adopts a cubic Bezier curve;
the hyperbola of the hyperbolic outlet duct structure (3) is generated by a hyperbolic equation.
CN202010322978.5A 2020-04-22 2020-04-22 Drainage near T-shaped pipe of three-section type regenerative system and design method Pending CN111412339A (en)

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Application Number Priority Date Filing Date Title
CN202010322978.5A CN111412339A (en) 2020-04-22 2020-04-22 Drainage near T-shaped pipe of three-section type regenerative system and design method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010322978.5A CN111412339A (en) 2020-04-22 2020-04-22 Drainage near T-shaped pipe of three-section type regenerative system and design method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113027547A (en) * 2021-04-08 2021-06-25 西安西热节能技术有限公司 Inlet structure of drainage cooling section of flow guide type heater and design method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113027547A (en) * 2021-04-08 2021-06-25 西安西热节能技术有限公司 Inlet structure of drainage cooling section of flow guide type heater and design method

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