CN210424458U

CN210424458U - Low-level safety door drainage device for steam pipeline

Info

Publication number: CN210424458U
Application number: CN201920953684.5U
Authority: CN
Inventors: 葛伟峰; 王建涛; 王同聚; 贾宗治; 宋跃辉; 陈兴伟; 赵冀平; 张涛; 马晓茹
Original assignee: Datang Luoyang Co Generation Power Co ltd
Current assignee: Datang Luoyang Co Generation Power Co ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-04-28
Anticipated expiration: 2029-06-24

Abstract

A low-level safety door drainage device for a steam pipeline comprises a safety valve header, wherein the safety valve header is communicated with one section of steam pipeline positioned above the safety valve header, a safety valve is arranged on the safety valve header and is used for opening to discharge steam when the pressure in the safety valve header exceeds a safety value, so that the phenomenon that the pressure in the steam pipeline communicated with the safety valve header is overlarge is avoided, a drainage pipeline is connected to the bottom of the safety valve header and is communicated with the other section of steam pipeline positioned below the safety valve header, through the pressure difference generated by continuous flow of the steam at the position communicated with a port of the drainage pipeline in the steam pipeline positioned below, the steam in the safety valve header continuously flows into the steam pipeline positioned below the safety valve header through the drainage pipeline, so that the steam in the safety valve header is prevented from being cooled and accumulated, and the phenomenon that the existing low-level safety door has overlarge impact force during air discharge due to accumulated water is avoided, the potential safety hazard of high-temperature steam leakage is eliminated.

Description

Low-level safety door drainage device for steam pipeline

Technical Field

The utility model relates to a steam conduit low level emergency exit field especially relates to a low level emergency exit hydrophobic means for steam conduit.

Background

In steam piping systems, safety gates are a medium discharge device that prevents piping overpressure and are widely used in industrial production. The safety valve is a medium discharge device for preventing the overpressure of the steam pipeline, only the steam pipeline can be opened for discharging the gas when the overpressure occurs, and when the steam pipeline is in a normal pressure range, the safety valve does not act and does not discharge the medium.

Due to the characteristic that the safety valve exhausts only when the pipeline is in overpressure, steam stored in the safety valve header is in a state that the steam hardly flows and can be considered to be static for a long time under the normal condition that the safety valve is closed, and the steam is cooled gradually for a long time, so that part of the steam in the safety valve header is condensed into water. In the high-level safety door, condensed water flows in a steam pipeline below a safety valve header under the action of self gravity and meets high-temperature steam in the steam pipeline to be heated and converted into steam for conveying in time, but in the low-level safety door, the condensed water has no discharge way and can generate accumulated water in the safety valve header of the low-level safety door, at the moment, if the safety valve is opened under overpressure of the steam pipeline and is exhausted and depressurized, the steam and the accumulated water in the safety valve header can be discharged under the action of high pressure, so that the high-pressure steam and the high-pressure accumulated water generate violent two-phase flow, huge impact force can be generated on the safety valve and the safety valve header, the low-level safety door and a discharge medium pipeline connected with the low-level safety door can easily generate violent vibration and even pipe explosion damage, and high-temperature steam leakage is caused, therefore, the low-level safety door of the existing steam pipeline is easy to accumulate water due to lack of, leading to potential safety hazard in long-term use.

SUMMERY OF THE UTILITY MODEL

Because the low level emergency exit for solving current steam conduit is lack hydrophobic means and easy ponding, lead to the problem that has the potential safety hazard in long-time the use, the utility model provides a low level emergency exit hydrophobic means for steam conduit.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be: the utility model provides a low level emergency exit hydrophobic means for steam conduit, the low level emergency exit include a relief valve header, relief valve header and one section steam conduit UNICOM that is located its top, install the relief valve on the relief valve header, be used for opening when the air pressure surpasss the safe value in the relief valve header and make steam discharge, thereby avoid the steam conduit of the intercommunication each other with the relief valve header in atmospheric pressure too big, the bottom of relief valve header is connected with a drain pipe, drain pipe and another section steam conduit UNICOM that is located relief valve header below, steam through the steam conduit that is located the below and drain pipe port UNICOM of putting through the steam continuously flows produced pressure differential, steam in the messenger relief valve header continues to flow in the steam conduit that is located its below through the drain pipe, thereby avoid the steam cooling ponding in the relief valve header.

Preferably, the drain pipe is connected with a control valve for controlling the on-off of the drain pipe.

Preferably, the drain pipeline adopts DN25 pipeline which is made of the same material as the steam pipeline.

According to the technical scheme, the beneficial effects of the utility model are that:

the utility model provides a low level emergency exit hydrophobic means for steam conduit, be connected with a drain pipe in the bottom of relief valve header, and with drain pipe and another section steam conduit looks UNICOM that is located the relief valve header below, and steam has the steam to flow in the steam conduit certainly, can know according to Bernoulli's equation, the port of drain pipe and the steam conduit looks UNICOM of below, because the gas in the steam conduit flows continuously, must make the atmospheric pressure in the steam conduit be less than the atmospheric pressure of drain pipe port, thereby make and produce pressure differential between steam conduit and the drain pipe of below, just can make the steam in the relief valve header flow to the steam conduit that is located its below through the drain pipe through pressure differential, steam in the relief valve header has been avoided the quiescent condition storage time overlength and the cooling condenses, thereby avoid the steam cooling ponding in the relief valve header, compared with the existing low-level safety door, the safety door can avoid the situation that accumulated water in the safety valve header flows with steam to generate high-pressure two-phase flow when the safety valve exhausts and reduces pressure, reduces the impact force on the safety valve and the safety valve header when exhausting, prevents the low-level safety door and a discharge medium pipeline connected with the low-level safety door from generating strong vibration and even the problem of pipe explosion damage, and eliminates the potential safety hazard of high-temperature steam leakage.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The labels in the figure are: 1. safety valve header, 2, steam conduit, 3, safety valve, 4, drain pipe, 5, control valve.

Detailed Description

Referring to the drawings, the specific embodiments are as follows:

the utility model provides a low level emergency exit hydrophobic means for steam conduit, the low level emergency exit include a relief valve header 1, relief valve header 1 and one section steam conduit 2 UNICOM that is located its top install relief valve 3 on the relief valve header 1 for open when the pressure exceeds the safe value in relief valve header 1 and make steam discharge, thereby avoid the steam conduit 2 with the mutual UNICOM of relief valve header 1 air pressure too big.

The bottom of relief valve header 1 is connected with a drain pipe 4, and drain pipe 4 and another section are located the steam conduit 2 UNICOM of relief valve header 1 below, and in this embodiment, drain pipe 4 adopts the DN25 pipeline of the same material with steam conduit 2 to be connected with control valve 5 on drain pipe 4, be used for controlling the break-make of drain pipe 4.

During the use of the steam pipe system, steam must flow continuously in the steam pipe 2 below the safety valve header 1, according to the bernoulli equation:

it can be known that, at the connection part of the port of the drain pipe 4 and the steam pipe 2 below the safety valve header 1, because the gas in the steam pipe 2 continuously flows, the flow speed difference is generated in the steam pipe 2 and the drain pipe 4, the air pressure in the steam pipe 2 is inevitably lower than the air pressure at the port of the drain pipe 4, so that the pressure difference is generated between the drain pipe 4 and the steam pipe 2 below the safety valve header 1, the steam in the safety valve header 1 can continuously flow into the steam pipe 2 below the safety valve header through the drain pipe 4 through the pressure difference, the phenomenon that the steam in the safety valve header 1 is cooled and condensed due to overlong storage time in a static state is avoided, the steam in the safety valve header 1 is prevented from cooling accumulated water, the phenomenon that the impact force is overlarge during air exhaust due to the accumulated water is avoided, and the potential safety hazard of high-temperature steam leakage is eliminated.

Claims

1. The utility model provides a low level emergency exit hydrophobic means for steam conduit, the low level emergency exit include a relief valve header (1), relief valve header (1) and one section steam conduit (2) UNICOM that are located its top, install relief valve (3) on relief valve header (1) for open when the air pressure surpasss the safe value in relief valve header (1) and make steam escape, thereby avoid too big its characterized in that with steam conduit (2) of relief valve header (1) interconnect: the bottom of relief valve header (1) is connected with a drain pipe (4), drain pipe (4) and another section are located steam conduit (2) looks UNICOM of relief valve header (1) below, steam through being located in the steam conduit (2) of below and drain pipe (4) port looks switch-on department lasts the produced pressure differential that flows, steam in messenger's relief valve header (1) passes through drain pipe (4) and lasts the flow in steam conduit (2) to being located its below, thereby avoid the steam cooling ponding in relief valve header (1).

2. The low level safety door drainage device for steam pipelines according to claim 1, wherein: the drain pipe (4) is connected with a control valve (5) for controlling the on-off of the drain pipe (4).

3. The low level safety door drainage device for steam pipelines according to claim 1, wherein: the drain pipe (4) adopts a DN25 pipeline which is made of the same material as the steam pipeline (2).