CN113154152A - Maintenance-free high-pressure-difference gas-phase medium valve system - Google Patents

Maintenance-free high-pressure-difference gas-phase medium valve system Download PDF

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Publication number
CN113154152A
CN113154152A CN202110419113.5A CN202110419113A CN113154152A CN 113154152 A CN113154152 A CN 113154152A CN 202110419113 A CN202110419113 A CN 202110419113A CN 113154152 A CN113154152 A CN 113154152A
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CN
China
Prior art keywords
pressure
valve
laval
tube
difference
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Pending
Application number
CN202110419113.5A
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Chinese (zh)
Inventor
黄霄霖洁
田杰
董玉泉
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Dominant King Technology Chengdu Co ltd
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Dominant King Technology Chengdu Co ltd
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Priority to CN202110419113.5A priority Critical patent/CN113154152A/en
Publication of CN113154152A publication Critical patent/CN113154152A/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
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)

Abstract

The invention discloses a maintenance-free high-pressure-difference gas-phase medium valve system which comprises a high-pressure-difference valve, a Laval tube and a contraction tube and is characterized in that one end of the high-pressure-difference valve is fixedly provided with the Laval tube, one end of the Laval tube, far away from the high-pressure-difference valve, is fixedly provided with the contraction tube, the high-pressure-difference valve is a hydrophobic emptying valve for a gas-phase medium, the high-pressure-difference valve is a gas-phase medium valve, the gas-phase medium valve is a high-pressure-difference valve with a hydrophobic emptying function, the Laval tube comprises a Laval inlet section, a Laval contraction section, a Laval balance section, a Laval diffusion section and a Laval outlet section, and the contraction tube comprises a contraction tube inlet section, a contraction tube contraction section and a contraction tube outlet section. The maintenance-free high-pressure-difference gas-phase medium valve system is simple and practical, shortens the maintenance period, reduces the cost and ensures the stable operation of a power plant.

Description

Maintenance-free high-pressure-difference gas-phase medium valve system
Technical Field
The invention mainly aims at the related technical field of high-temperature and high-pressure steam valves of thermal power plants, and particularly relates to a maintenance-free high-pressure-difference gas-phase medium valve system.
Background
In a thermal power plant unit, a plurality of high-temperature high-pressure valves are used, for example, an emergency drainage evacuation valve, because the valve outlet is in opposite air discharge, the front-back pressure difference of the valve is very large, and high-pressure steam flows to a low-pressure area after the valve is started, so that the medium flow velocity is very large at the moment of opening the valve, a sealing surface bears huge impact, and high-speed fluid quickly damages the sealing surface and even the valve body, thereby causing the leakage of the valve or the scrapping of the valve. The leaked high-temperature and high-pressure medium threatens field personnel and equipment, brings great potential safety hazard to the operation of a unit, has high valve maintenance cost and long construction period, and brings direct economic loss to a power plant.
The existing method for solving the valve impact of the power plant mainly comprises the following steps: the effect is not obvious when the valve is replaced and the diameter of the pipeline is increased. The main body is as follows: the cost of replacing the valve and the pipeline is high, the time is long, the leakage phenomenon can occur after the valve is started and stopped for a plurality of times, and the fundamental problem can not be solved by repeatedly and frequently replacing the valve.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a maintenance-free high-pressure-difference gas-phase medium valve system to solve the problem that flowing media scours valves and pipelines in the starting and stopping processes of the valves and avoid damage to the valves and pipe walls and steam leakage.
In order to solve the above problems, the present invention provides a new solution:
the maintenance-free high-pressure-difference gas-phase medium valve system comprises a high-pressure-difference valve, a Laval tube and a contraction tube, and is characterized in that one end of the high-pressure-difference valve is fixedly installed on the Laval tube, and one end, far away from the high-pressure-difference valve, of the Laval tube is fixedly installed on the contraction tube.
As a further technical scheme of the invention: the high pressure difference valve is a hydrophobic emptying valve for gas-phase medium.
As a further technical scheme of the invention: the high-pressure-difference valve is a gas-phase medium valve, and the gas-phase medium valve is a high-pressure-difference valve with a draining and emptying function.
As a further technical scheme of the invention: the laval tube is composed of a laval inlet section, a laval contraction section, a laval balance section, a laval diffusion section and a laval outlet section.
As a further technical scheme of the invention: the shrinkage pipe is composed of a shrinkage pipe inlet section, a shrinkage pipe shrinkage section and a shrinkage pipe outlet section.
Compared with the prior art, the invention has the beneficial effects that:
the Laval pipe is added behind the high-pressure-difference valve, so that the front-back pressure difference of the valve can be reduced, the flow velocity of a medium is reduced, and the valve is prevented from being washed; the contraction pipe can reduce the flow velocity of the medium in the outlet pipeline, so that the outlet pipeline is prevented from being washed, and the valve and the pipeline are protected at the same time. The Laval pipe and the contraction pipe are connected by flanges, so that the pipe is easy to detach, convenient to replace and low in cost. The valve system is simple and practical, shortens the maintenance period, reduces the cost and ensures the stable operation of a power plant.
Drawings
FIG. 1 is a schematic view of a maintenance-free high differential pressure vapor phase media valve system assembly.
FIG. 2 is a schematic view of a Laval tube in a maintenance-free high differential pressure vapor phase media valve system.
FIG. 3 is a schematic view of a shrink tube in a maintenance-free high differential pressure vapor medium valve system.
Wherein, 1 is a high pressure difference valve, 2 is a Laval tube, and 3 is a contraction tube; the three-way pipe comprises a straight pipe at the inlet of the Laval pipe, a contraction section of the Laval pipe, a balance section of the Laval pipe, a diffusion section at the outlet of the Laval pipe, an outlet section of the Laval pipe, an inlet section of the contraction pipe, a contraction section of the contraction pipe and an outlet section of the contraction pipe.
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 a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 3, a maintenance-free high-pressure-difference gas-phase medium valve system includes a high-pressure-difference valve 1, a laval tube 2 and a contraction tube 3, and is characterized in that one end of the high-pressure-difference valve is fixedly mounted on the laval tube 2, and one end of the laval tube 2, which is far away from the high-pressure-difference valve 1, is fixedly mounted on the contraction tube 3, wherein the high-pressure-difference valve 1, the laval tube 2 and the contraction tube 3 are connected by flanges.
As can be seen from FIG. 2, the Laval tube 2 is composed of a contraction section, a Laval tube balance section, a Laval tube diffusion section and a Laval tube outlet section, and the inlet diameter D of the Laval tube is determined by calculation1Length L of the inlet section1Diameter of throat D0Diameter of outlet D2Angle of contraction theta1Angle of divergence theta2Length L of the balance tube0And a laval outlet section length L2。
As can be seen from FIG. 3, the shrink tube 3 is formed by a shrink tube inlet section, a shrink tube shrink section and a shrink tube outlet section, the shrink section inlet diameter D being determined by calculation3Length L of inlet section of contraction tube3Diameter of outlet D4Angle of contraction theta3And length L of outlet section of shrink tube4
As shown above, considering that the front and back pressure difference of the valve is large, when the valve is opened instantly, high-pressure gas flows from the high-pressure area to the low-pressure area, the gas flow rate is increased due to the large pressure difference, destructive washing is caused to the valve, and the sealing surface of the valve is damaged in a short time, so that the valve is leaked. To solve the above problem, it is necessary to increase the post-valve pressure to decrease the post-valve speed. Due to the particularity of the high temperature and pressure gas, coupled with the design of the rocket inflator (i.e., the laval tube), the velocity of the gas continues to increase in the diffuser tube at supersonic conditions. Therefore, a Laval tube is added behind the valve, the flow velocity of a gas medium in the Laval tube is rapidly increased, the kinetic energy is increased, the Bernoulli equation in fluid mechanics can know that the gas pressure energy behind the valve is converted into the kinetic energy in the Laval tube, the kinetic energy in the Laval tube is larger, the pressure energy behind the valve is larger, and therefore the Laval tube behind the valve can increase the pressure behind the valve, reduce the pressure difference between the front and the back of the valve, reduce the speed of the medium behind the valve, avoid the valve from being washed away, and prolong the service life of the valve. Since the laval tube outlet velocity is high, to avoid the outlet conduit from being flushed, a shrink tube is connected behind the laval tube to reduce the fluid velocity.
The system effectively improves the pressure behind the valve, reduces the speed of the medium behind the valve and prolongs the service life of the valve; the three parts are connected through flanges, so that the mounting and dismounting are cheap, the laval pipe and the shrinkage pipe are convenient to replace and low in cost, the shutdown hidden danger of a power plant caused by valve damage is reduced, and the operation cost is saved.
Example 2, based on the above example 1, the size of each part of the design can be adjusted, so that the valve is suitable for high-temperature high-pressure difference gas-phase medium valves under different conditions of most industrial production units.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (4)

1. The maintenance-free high-pressure-difference gas-phase medium valve system comprises a high-pressure-difference valve (1), a Laval tube (2) and a contraction tube (3), and is characterized in that one end of the high-pressure-difference valve is fixedly installed on the Laval tube (2), and one end, far away from the high-pressure-difference valve (1), of the Laval tube (2) is fixedly installed on the contraction tube (3).
2. The maintenance-free high-pressure-difference gas-phase medium valve system as claimed in claim 1, wherein the high-pressure-difference valve (1) is a gas-phase medium valve, and the gas-phase medium valve is a high-pressure-difference valve with a hydrophobic evacuation function.
3. The maintenance-free high-pressure-difference gas-phase medium valve system as claimed in claim 1, wherein the laval pipe (2) is composed of a laval inlet section, a laval contraction section, a laval balance section, a laval diffusion section and a laval outlet section.
4. The maintenance-free high-pressure-difference gas-phase medium valve system as claimed in claim 1, wherein the shrink tube (3) is composed of a shrink tube inlet section, a shrink tube shrink section and a shrink tube outlet section.
CN202110419113.5A 2021-04-19 2021-04-19 Maintenance-free high-pressure-difference gas-phase medium valve system Pending CN113154152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110419113.5A CN113154152A (en) 2021-04-19 2021-04-19 Maintenance-free high-pressure-difference gas-phase medium valve system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110419113.5A CN113154152A (en) 2021-04-19 2021-04-19 Maintenance-free high-pressure-difference gas-phase medium valve system

Publications (1)

Publication Number Publication Date
CN113154152A true CN113154152A (en) 2021-07-23

Family

ID=76868857

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110419113.5A Pending CN113154152A (en) 2021-04-19 2021-04-19 Maintenance-free high-pressure-difference gas-phase medium valve system

Country Status (1)

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CN (1) CN113154152A (en)

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