JP2005152783A - System for eliminating scale adhering on equipment by cavitation through oil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a system for eliminating scale adhering on equipment by cavitation through oil which eliminates the scale owing to effective destruction of deposits such as the scale and the like adhering and accumulated on the inside of the equipment in a short time without damaging the adhering surface of the equipment. <P>SOLUTION: In petroleum refinery and petrochemical equipment placed with at least a circulating pump 1, a heat exchanger 2, containers 5 storing a desired volume of a light oil along circulating pipe lines P<SB>1</SB>, P<SB>2</SB>, P<SB>3</SB>, a light oil circulating means supplying the light oil to the containers 5 from the heat exchanger 2 by heating by the circulating pump 1 through the pipeline P<SB>1</SB>, P<SB>2</SB>, P<SB>3</SB>, and a high pressure cavitation generating means generating high pressure cavitation by a high pressure pump 7 arranged through a branched pipe line branched from the circulation pipe line of the upstream side of the circulating pump 1 are provided, and the high pressure cavitation is generated through at least one of the circulation light oil passing through the heat exchanger 2 and the containers 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an equipment adhesion scale removal system by cavitation in oil that can remove scales and other deposits adhering to the inside of equipment of petroleum and petrochemical equipment in a non-open manner without disassembling the equipment. Is.

  When removing scales and other deposits and deposits adhering to containers and heat exchangers constituting conventional oil refining equipment, it is necessary to disassemble the equipment of the equipment in advance, and the necessary removal work After you finish, you must assemble them. And during the disassembly and assembly work, the operation of the oil refining apparatus was inevitably stopped. In other words, in the equipment industry such as petroleum refining and petrochemical, one of the most important issues for manufacturers is how to maintain productivity of production facilities or reduce energy loss.

  Therefore, conventionally, as shown in Japanese Patent Laid-Open No. 10-273695, a method of stopping operation for periodic inspection, chemically decomposing and cleaning deposits adhering to the inside of the equipment, and discharging it outside is disclosed. As shown in JP-A-5-172494, JP-A-10-217123, JP-A-2002-263600, etc., the deposit deposited and adhering to the inside of the apparatus after being disassembled and opened is physically applied by a high-pressure jet method or the like. The method of crushing and removing by the method is widely performed. In this case, in this chemical cleaning method, a chemical cleaning agent, which has been specially developed while heating and circulating the cleaning liquid, is added.

  However, when there is a large amount of deposits, it takes a long time for infiltration, and even if the infiltration progresses, it may not be able to be crushed and outflowed only by the infiltration ability and flow force of the cleaning liquid. As a result, when confirmed after the chemical cleaning, a large amount of deposits may remain without being removed.

On the other hand, oil refining and petrochemical equipment is generally referred to as co-oil cleaning, in which light oil is heated and circulated to clean the inside of the equipment before stopping production operations and disassembling required equipment. In this cleaning method, it is inevitable that a large amount of dirt remains and accumulates in this cleaning method as in the above-described chemical cleaning method.
JP-A-10-273695 JP-A-5-172494 JP 10-217123 A JP 2002-263600 A

  In the present invention, deposits such as scales adhering to and staying inside the equipment are damaged by disposing a predetermined additional means on the co-oil cleaning means that is easy to perform post-cleaning after cleaning, and damage the attached surface of the equipment. Therefore, it is an object of the present invention to obtain an equipment adhesion scale removal system by cavitation in oil that can be effectively destroyed and removed in a short period of time.

  The present invention has been made in view of the above viewpoints, and its main configuration is that a circulation pump, a heat exchanger, and containers for storing a required amount of light oil are arranged along the circulation pipeline. A light oil circulation means heated by the circulation pump and fed from the heat exchanger to the containers through a circulation pipeline, and circulation upstream of the circulation pump. A high-pressure cavitation generating means for generating high-pressure cavitation by a high-pressure pump arranged via a branch pipeline branched from the pipeline, and in at least one of the circulating light oil flowing in the heat exchanger and containers Provides a scale removal system for equipment adhesion by cavitation in oil that generates the high-pressure cavitation jet. It is Utosuru thing.

  As is apparent from the above description, the system for removing equipment adhesion scale by cavitation in oil according to the present invention includes at least a circulation pump, a heat exchanger, and containers for storing a required amount of light oil along the circulation pipeline. A light oil circulation means heated by the circulation pump and fed from the heat exchanger to the containers through a circulation pipeline in an apparatus for petroleum refining and petrochemistry, and an upstream side of the circulation pump High-pressure cavitation generating means for generating high-pressure cavitation by a high-pressure pump arranged via a branch pipeline branched from the circulation pipeline, and at least one of the circulating light oil flowing in the heat exchanger and containers The high-pressure cavitation jet is generated in oil. Thereby, deposits or deposits such as scales that adhere to and stay inside equipment such as heat exchangers and containers simply by providing additional means in the co-oil cleaning means that can be easily post-treated after cleaning, Without damaging the adhesion surface of the device, it can be effectively and uniformly destroyed and removed in a short time.

Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a conceptual diagram of a piping configuration showing a comprehensive embodiment showing the principle of the present invention. The circulation pump 1 heats light oil and stops the pipe P ₁ constituting a part of the circulation pipeline before the production operation is stopped and inspection is started in an apparatus related to oil refining and petrochemical. It is made to flow in the inlet 3 of the outer side piping of the heat exchanger 2 arrange | positioned through.

  The heat exchanger 2 performs temperature substitution on the inner and outer surfaces of the tube by flowing two different fluids having a temperature difference between the inner and outer surfaces of the tube provided therein, and the light oil is supplied to the inlet 3 of the outer pipe. In the process of flowing in and flowing out from the tube outer surface side to the outlet 4, temperature replacement is performed with another fluid having a temperature difference passing through the tube inner surface side.

Wherein the outlet 4 containers 5 for storing the light oil of the required capacity via the pipe P ₂ constituting a part of the circulation pipeline is Yuiro.

Light oil stored in the containers 5, the refluxed through a pipe P ₃ constituting a part of the circulation pipeline to the circulation pump 1, and, between the containers 5 and the circulation pump 1 strainer or filter 6 is interposed in the pipe P _3.

  The strainer or filter 6 is for periodically removing foreign matters such as dirt and scale in the system connected by the circulation line, and a mesh-structure bucket is provided in the inside thereof in a detachable manner. In the case where foreign matter such as dirt or scale accumulates in the bucket, the bucket can be cleaned at any time.

Branch pipe P ₃ between the containers 5 and the circulation pump 1, the said branch pipe P ₄ disposed cavitation generating high-pressure pump 7 of light oil circulation. In this case, when the branch position of the branch pipe P ₄ is upstream of the strainer or filter 6, the strainer or filter 8 is interposed upstream of the input side of the high-pressure pump 7. The capacity of the high-pressure pump 7 is preferably 1 Mpa or more.

The output side of the high-pressure pump 7 is branched by branch pipes P ₅ and P ₆ to the inlet 9 of the inner pipe of the heat exchanger 2 and the receptacle 10 of the containers 5, and the branch pipe P ₅ , the distal end portion of the P _6, cavitation nozzle 11, 12 is mounted a high-pressure nozzles used for descaling are cleaned object.

  If the cavitation nozzles 11 and 12 use a bell-shaped enlarged cavity type (jet diameter: φ1.2, φ1.5) as shown in FIG. 2, the cavitation jet from the nozzle provided with the enlarged cavity is Apparently, the volume of cavitation is large and the effective cleaning area is wide.

  In addition, in the cavitation jet impact pressure distribution of an example showing the correlation between the distance from the nozzle outlet and the power of the cavitation jet as shown in FIG. 3, if the second peak region is used, the cleaning effect is large. Conceivable.

Next, the configuration and operation of the above embodiment will be described.
In an operation mode for removing deposits and deposits such as scales, the high-pressure pump 7 for generating cavitation is operated together with the circulation pump 1. The circulation pump 1 causes light oil to flow along the circulation pipeline into the heat exchanger 2 and the containers 5 for cleaning. In addition, the high-speed oil-in-jet jet injected by the operation of the high-pressure pump 7 is a cavitation jet containing cavitation bubbles because the central part of the vortex generated at the interface between the jet flow and the surrounding fluid is low. It becomes.

  The size of the cavitation jet generated in the heat exchanger 2 and the containers 5 is determined by the correlation between the pressure / flow rate of the high-pressure pump 7 and the diameters of the cavitation nozzles 11 and 12. For example, a cavitation jet jet is generated at a pump pressure of 5 Mpa or more and a flow rate of 20 (l / min) or more.

  Therefore, since the cavitation jet jet synergizes with the light oil circulating by providing a circulation pipeline together with the cavitation jet jet, the effect of the jet is also transmitted to the downstream side in the flow direction, thereby the heat exchanger. 2 and the range of removal of objects to be cleaned such as scales accumulated in the containers 5 are expanded. In that case, the flow rate of the cleaning oil (light oil) is equivalent to the circulation flow rate of 0.2 m / s to 0.5 m / s in the apparatus, and the cavitation injection time is performed within 24 hours.

It is a conceptual diagram of the piping configuration showing a comprehensive example showing the principle of the present invention. It is sectional drawing of the cavitation nozzle which shows an example of the bell-shaped expansion cavity type used for the structure of one Example of this invention. It is a cavitation jet impact-pressure distribution map of an example which shows the correlation with the distance from the exit of a cavitation nozzle, and the power of a cavitation jet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circulation pump 2 Heat exchanger 3 Inlet of outer piping of heat exchanger 4 Outlet of outer piping of heat exchanger 5 Containers 6 Strainer or filter 7 High pressure pump for cavitation generation 8 Strainer or filter 9 Inlet of inner piping of heat exchanger Inlet 10 Receptacle for container 11 Cavitation nozzle 12 Cavitation nozzle P ₁ pipe P ₂ pipe P ₃ pipe P ₄ branch pipe P ₅ branch pipe P ₆ branch pipe

Claims (6)

In an oil refining and petrochemical-related apparatus comprising at least a circulation pump 1, a heat exchanger 2, and containers 5 for storing a required amount of light oil along the circulation pipelines P ₁ , P ₂ and P ₃ . ,
A light oil circulation means heated by the circulation pump 1 and fed from the heat exchanger 2 to the containers 5 through circulation pipelines P ₁ , P ₂ , P ₃ ;
High-pressure cavitation generating means for generating high-pressure cavitation by a high-pressure pump 7 disposed via a branch pipeline branched from a circulation pipeline upstream of the circulation pump 1;
The equipment adhesion scale removal system by cavitation in oil, wherein the high-pressure cavitation is generated in at least one of the circulating light oils flowing in the heat exchanger 2 and the containers 5.   The equipment adhesion scale removal system by cavitation in oil according to claim 1, wherein cavitation nozzles 11 and 12 are attached to the high-pressure cavitation generating means, and a cavitation jet is ejected from the tip thereof.   The apparatus adhesion scale removal system by cavitation in oil according to claim 1 or 2, wherein a strainer or a filter (6) is interposed upstream of the input side of the circulation pump (1).   The apparatus adhesion scale removal system by cavitation in oil according to any one of claims 1 to 3, wherein a strainer or a filter 8 is interposed upstream of the input side of the high-pressure pump 7.   5. The equipment adhesion scale removal system by cavitation in oil according to claim 4, wherein the high-pressure pump 7 has a capacity of 1 Mpa or more.   A mesh-structure bucket is detachably provided inside the strainer or filter 6 or 8, and when foreign matter such as dirt or scale is accumulated in the bucket, the bucket can be cleaned at any time. Item 3 or 4 equipment adhesion scale removal system by cavitation in oil.

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