CN216976516U

CN216976516U - Device for reducing counter-channeling risk of combustible gas

Info

Publication number: CN216976516U
Application number: CN202220360877.1U
Authority: CN
Inventors: 周召方; 刘畅; 易波
Original assignee: Sinopec Sk Wuhan Petrochemical Co ltd; China Petroleum and Chemical Corp
Current assignee: Sinopec Sk Wuhan Petrochemical Co ltd; China Petroleum and Chemical Corp
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-07-15
Anticipated expiration: 2032-02-22

Abstract

An apparatus for reducing the risk of back-channeling of combustible gas, comprising: a flushing liquid flowing pipeline 1, wherein one end of the flushing liquid flowing pipeline 1 is a flushing liquid inlet, and the other end of the flushing liquid flowing pipeline 1 is a flushing liquid outlet; the washing fluid circulation pipeline is characterized in that an expanding pipe 2 and a U-shaped pipe 4 are sequentially connected in series on the washing fluid circulation pipeline 1, and a pressure gauge 3 is arranged on the expanding pipe 2; the U-shaped pipe 4 is of a sinking type, namely the bottom of the U-shaped pipe is positioned below the flushing fluid circulation pipeline 1. The utility model has simple and practical structure and simple manufacture; flushing fluid circulation pipeline, expanding tube, manometer, all adopt airtight connection between the U type pipe, when containing gas in the liquid phase component, can come out with partly gas flash evaporation on the one hand, pressure can change, and operating personnel can take corresponding measure after discovering pressure change, is full of the liquid phase component in the U type pipe on the other hand, and the short time can prevent that gas from scurrying into follow-up system, can be used for improving surrounding environment and production safety.

Description

Device for reducing counter-channeling risk of combustible gas

Technical Field

The utility model relates to the technical field of petrochemical industry, and further provides a device for reducing the risk of back-fleeing of combustible gas, which belongs to the technical field of improving the surrounding environment and production safety by reducing the risk of back-fleeing of combustible gas.

Background

With the development of petrochemical technology, the variety of oil products, olefin and the like is more and more widely applied, during the 2021 year of 2017-reservoir oil, the peak period of large-scale ethylene and oil refining construction is brought forward in China, ethylene and oil refineries belong to high-risk industries, and if high pressure channeling and low pressure channeling occur, especially gas channeling to low pressure or normal pressure equipment, the consequence is unimaginable. Among the accidents of domestic large-scale ethylene and oil refineries, 90 percent of the accidents occur in the maintenance process which involves steam boiling or water washing of equipment, after the above procedure is completed, the condensed water condensed from the steam or the water with solvent after washing is often discharged into a sewage tank, and once the residual combustible gas exists in the boiling or washing equipment, the combustible gas can quickly flow into low-pressure equipment, particularly normal-pressure equipment through a pipeline, when a certain pressure is reached, a pressure relief valve of the protection equipment can be automatically opened, combustible gas can volatilize to the atmosphere, and ordinary pressure equipment releases a large amount of gas in the twinkling of an eye, and the energy that forms is huge, damages equipment, and combustible gas forms explosive mixture with the air when serious, leads to the emergence of fire explosion, not only leads to the damage of equipment, and harm personal safety and environmental pollution moreover.

In the petrochemical production process, there are often immiscible or slightly soluble gas-liquid two-phase, when carrying liquid, these combustible gas can be reversed flee to the liquid pipeline in, in the equipment that flow direction pressure is low through the pipeline, the gas accumulation in the equipment to the certain degree, pressure sharply risees, for protective apparatus, urgent relief valve can be add to the equipment in the design process, when pressure surpassed the set pressure of relief valve, the relief valve can be opened automatically, in case equipment and atmosphere intercommunication, the internal pressure of jar releases in the twinkling of an eye, the energy of release not only damages equipment, can explode when serious, seriously influence personal safety and surrounding environment.

A butadiene device of a petrochemical company starts a centrifugal pump to send condensate in a sodium nitrite aqueous solution storage tank to a first extraction tower reflux tank, a second extraction system is prepared to be washed, a washing pipeline is connected with an atmospheric tank, a breather valve is arranged at the top of the tank, hydrocarbon-containing aqueous solution in the tank reversely flows to the atmospheric tank through a minimum reflux line because the pressure of the first extraction tower reflux tank is 0.3MPa, hydrocarbon meets hot water in the tank and is quickly gasified in the atmospheric tank to cause overpressure and leakage of equipment, partial carbon-tetracarbon volatilizes into the air in the event processing process to cause local environmental pollution, and the bottom of the atmospheric tank is damaged and deformed. Therefore, a solution is needed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a device for reducing the risk of combustible gas channeling, and aims to solve the technical problem that the combustible gas can possibly flow backwards into a liquid pipeline and flow to equipment with low pressure through the pipeline to cause fire explosion.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an apparatus for reducing the risk of back-channeling of combustible gas, comprising: a flushing liquid flowing pipeline 1, wherein one end of the flushing liquid flowing pipeline 1 is a flushing liquid inlet, and the other end of the flushing liquid flowing pipeline 1 is a flushing liquid outlet; the washing fluid circulation pipeline is characterized in that an expanding pipe 2 and a U-shaped pipe 4 are sequentially connected in series on the washing fluid circulation pipeline 1, and a pressure gauge 3 is arranged on the expanding pipe 2; the U-shaped pipe 4 is of a sinking type, namely the bottom of the U-shaped pipe is positioned below the flushing fluid circulation pipeline 1.

The expanding pipe 2 is of an arch, spherical or cylindrical cavity structure, two ends of the expanding pipe are in smooth transition connection with the flushing fluid circulation pipeline, the expanding pipe 2 outwards expands and becomes thick by taking the pipe diameter of the flushing fluid circulation pipeline as a reference, and the flushing fluid circulation pipeline is connected with the expanding pipe in a welding mode.

The depth of the U-shaped pipe is 400 mm-600 mm, namely the height between the center line of the pipeline at the bottom of the U-shaped pipe and the center line of the flushing fluid circulation pipeline is 400 mm-600 mm; the diameter of the pipeline is the same as that of the flushing liquid flowing pipeline.

The U-shaped pipe and the expanding pipe are connected by welding.

The flushing liquid flow pipeline 1 is a pipeline for conveying a flushing liquid fluid medium, and the pipe diameter and the pressure grade are determined by the properties and the flow of the conveyed flushing liquid medium; the expanding pipe 2 is in an arch, spherical or cylindrical cavity structure and has the functions that when fluid passes through the expanding pipe, the flow velocity is reduced, the dynamic pressure is reduced, the static pressure is increased, and gas phase components dissolved in a liquid phase are instantly gasified to cause pressure change at the top of the expanding pipe, so that whether gas components are mixed in the liquid phase components or not can be judged through the pressure gauge 3; the pressure gauge 3 is arranged at the top of the expanding tube, is connected with a remote transmitter and is used for observing the pressure change condition of the pipeline; the U-tube 4 is filled with a flushing liquid, typically fresh water, forming a liquid seal, reducing gas blow-by into downstream systems. The flushing fluid circulation pipeline is connected with the expanding pipe in a welding mode. The expanding pipe is in an arch shape, a circular shape, a cylindrical shape and an optimized arch shape. The pressure gauge is provided with a pressure transmitter and has a remote transmission function. The U-shaped pipe and the expanding pipe are connected in a welding mode, the depth is 400 mm-600 mm, namely the height between the center line of the pipeline at the bottom of the U-shaped pipe and the center line of the circulating pipe is preferably 500mm, and the diameter of the U-shaped pipe is consistent with that of the circulating pipe.

The utility model has the beneficial effects that: the structure is simple and practical, and the manufacture is simple; flushing fluid circulation pipeline, expanding tube, manometer, all adopt airtight connection between the U type pipe, when containing gas in the liquid phase component, can come out with partly gas flash evaporation on the one hand, pressure can change, and operating personnel can take corresponding measure after discovering pressure change, is full of the liquid phase component in the U type pipe on the other hand, and the short time can prevent that gas from scurrying into follow-up system, can be used for improving surrounding environment and production safety.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Wherein: 1 is a flushing fluid circulation pipeline, 2 is an expanding pipe, 3 is a pressure gauge and 4 is a U-shaped pipe.

Detailed Description

The following detailed description of the embodiments of the present invention is provided, but the present invention is not limited to the following description.

Referring to fig. 1, an apparatus for reducing the risk of back-fleeing of combustible gas according to the present invention comprises: a flushing liquid flowing pipeline 1, wherein one end of the flushing liquid flowing pipeline 1 is a flushing liquid inlet, and the other end of the flushing liquid flowing pipeline 1 is a flushing liquid outlet; the flushing fluid circulation pipeline is characterized in that an expanding pipe 2 and a U-shaped pipe 4 are sequentially connected in series on the flushing fluid circulation pipeline 1, and a pressure gauge 3 is arranged on the expanding pipe 2; the U-shaped pipe 4 is of a sinking type, namely the bottom of the U-shaped pipe is positioned below the flushing fluid circulation pipeline 1.

The expanding pipe 2 is of an arch, spherical or cylindrical cavity structure, two ends of the expanding pipe are in smooth transition connection with the flushing fluid circulation pipeline, the expanding pipe 2 is expanded outwards to be thick by taking the pipe diameter of the flushing fluid circulation pipeline as a reference, and the flushing fluid circulation pipeline is connected with the expanding pipe in a welding mode.

The U-shaped pipe and the expanding pipe are connected by welding.

Preferably, the depth of the U-shaped pipe is 500mm, and the diameter of the U-shaped pipe is consistent with that of the flushing liquid flowing pipeline.

The working principle of the utility model is as follows:

the utility model mainly mixes the flammable gas which is not soluble or slightly soluble with the liquid phase component, when passing through the expanding tube 2 through the flushing fluid circulation pipeline 1, the flow velocity is reduced, the gas can be flashed, the pressure can be changed, the pressure gauge with the remote transmission function fluctuates, when the operator finds the phenomenon, the operator immediately takes the isolation measure to avoid the gas phase component from entering the liquid phase component, when the operator is not in time to process, the following U-shaped tube has the liquid sealing function, which can prevent most of the gas from entering the subsequent system, prevent the gas from entering the low pressure system, damage the equipment and ensure the production and personal safety.

The installation method comprises the following steps:

(1) manufacturing a flushing fluid circulation pipeline: the pipe is made of common carbon steel, the pipe diameter is 100mm, one end of the pipe is connected by a flange, and the other end of the pipe is welded with an expanding pipe;

(2) manufacturing an expanded pipe: the steel plate is made of common carbon steel, and is arched, the maximum diameter is 150mm, and the minimum diameter is 100 mm;

(3) manufacturing a pressure gauge: the pressure gauge is provided with a pressure transmitter and has a remote transmission function, and the measuring range is 0.3-0.5 MPa;

(4) manufacturing a U-shaped pipe: the carbon steel is made of common carbon steel, the preferred depth is 500mm, namely the height between the central line of the pipeline at the bottom of the U-shaped pipe and the central line of the circulating pipe, and the diameter is 100 mm.

The utility model is illustrated below with reference to specific examples:

example 1:

the utility model discloses application of a device for reducing the counter-fleeing risk of combustible gas in a butadiene extraction device, which comprises the following implementation steps:

in the first overhaul process, a solvent system needs to be washed by water to remove the solvent out of the system, the device is installed and used in the water withdrawal process, as the residual four components of combustible carbon are mixed into the pipeline and then pass through the flushing fluid circulation pipeline 1 and the expanding pipe 2, the flow rate is reduced, the gas can be flashed, the pressure can be changed, and the numerical value of a pressure gauge with a remote transmission function fluctuates. Wherein the content of the first and second substances,

(2) manufacturing an expanding tube: the steel plate is made of common carbon steel, and is arched, the maximum diameter is 150mm, and the minimum diameter is 100 mm;

(4) manufacturing a U-shaped pipe: the depth of the U-shaped pipe is 500mm, namely the height between the central line of the pipeline at the bottom of the U-shaped pipe and the central line of the circulating pipe, and the diameter of the U-shaped pipe is 100 mm.

After the scheme is implemented, the butadiene extraction device has no combustible gas back-flowing event in the operation and maintenance process.

Comparative example 1: the traditional way of transporting liquid is to transport liquid from a high pressure system to a low pressure system by using a pressure difference as power through a pipeline.

In the first overhaul process, the solvent system needs to be washed by water to remove the solvent out of the system, and in the water-removing process, because the residual flammable carbon four components are mixed into the pipeline, the flammable carbon four components enter the normal-pressure tank along with the washing water, so that flash explosion occurs, equipment is damaged, and environmental pollution accidents occur.

From the above results, it can be seen that: the traditional liquid conveying mode can cause hydrocarbon substances to overflow, so that not only is the equipment damaged, but also the environment is polluted.

The above examples are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. An apparatus for reducing the risk of back-channeling of combustible gas, comprising: a flushing liquid circulation pipeline (1), wherein one end of the flushing liquid circulation pipeline (1) is a flushing liquid inlet, and the other end of the flushing liquid circulation pipeline is a flushing liquid outlet; the washing fluid circulation pipeline is characterized in that an expanding pipe (2) and a U-shaped pipe (4) are sequentially connected in series on the washing fluid circulation pipeline (1), and a pressure gauge (3) is arranged on the expanding pipe (2); the U-shaped pipe (4) is of a sinking type, namely the bottom of the U-shaped pipe is positioned below the flushing fluid circulation pipeline (1).

2. The device for reducing the risk of back-flow of combustible gas according to claim 1, wherein the expanding tube (2) has an arch, sphere or cylindrical cavity structure, and both ends of the expanding tube are smoothly and transitionally connected with the flushing fluid flow pipeline, the expanding tube (2) expands outwards and becomes thicker based on the diameter of the flushing fluid flow pipeline, and the flushing fluid flow pipeline and the expanding tube are connected by welding.

3. The device for reducing the risk of back-flow of combustible gas as claimed in claim 2, wherein the depth of the U-shaped pipe is 400mm to 600mm, that is, the height between the center line of the pipeline at the bottom of the U-shaped pipe and the center line of the flushing liquid circulation pipeline is 400mm to 600 mm; the diameter of the pipeline is the same as that of the flushing liquid flowing pipeline.

4. A device for reducing the risk of reverse flow of combustible gas as set forth in claim 3, wherein said U-shaped tube is welded to said expanded diameter tube.