CN109023393B - Cleaning agent and integral disassembly-free cleaning method for oil side of heat exchange equipment - Google Patents

Cleaning agent and integral disassembly-free cleaning method for oil side of heat exchange equipment Download PDF

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Publication number
CN109023393B
CN109023393B CN201810686325.8A CN201810686325A CN109023393B CN 109023393 B CN109023393 B CN 109023393B CN 201810686325 A CN201810686325 A CN 201810686325A CN 109023393 B CN109023393 B CN 109023393B
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cleaning
agent
water
heat exchange
cleaning agent
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CN109023393A (en
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全无畏
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Guangzhou Renhe Cleaning Co ltd
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Guangzhou Renhe Cleaning Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/16—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions using inhibitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2209/00—Details of machines or methods for cleaning hollow articles
    • B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
    • B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2209/00—Details of machines or methods for cleaning hollow articles
    • B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
    • B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
    • B08B2209/032—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces by the mechanical action of a moving fluid

Abstract

The invention discloses a cleaning agent, which comprises water, a composite corrosion inhibitor, a composite alkali liquor, a surfactant, a suspending agent and a swelling agent; the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100 (2.5-3.5): (7-9): (1-3): (1-3): 0.5-2). The invention also discloses an integral disassembly-free cleaning method for the oil side of the heat exchange equipment. The cleaning agent disclosed by the invention has the characteristics of good cleaning effect and low corrosivity. The cleaning method has the advantages of in-situ integral disassembly-free, full-dissolution cleaning, convenient operation and short cleaning time, and fundamentally solves the technical problem that a repair factory needs to be cleaned.

Description

Cleaning agent and integral disassembly-free cleaning method for oil side of heat exchange equipment
Technical Field
The invention relates to a cleaning agent and a cleaning method, in particular to an integral disassembly-free cleaning method for an oil side of a cleaning agent and a heat exchange device.
Background
Various heat exchange devices (such as a main fresh water cooler and an auxiliary fresh water cooler, a main lubricating oil cooler and an auxiliary lubricating oil cooler) are one of essential important devices of a ship, and under the state of long-time operation, each medium side of each heat exchange device can generate corresponding dirt, and the heat exchange efficiency is directly influenced by the generation of the dirt, so that the operation efficiency of the system is reduced or the system stops operating. In the prior art, the method for removing various scales basically depends on manual disassembly to a repair plant for alkali boiling or acid washing, and has the defects of long cleaning time, poor scale removal effect and high corrosion to equipment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a cleaning agent which has the characteristics of good cleaning effect and low corrosivity.
The invention also aims to provide an integral disassembly-free cleaning method for the oil side of the heat exchange equipment, which has the advantages of in-situ integral disassembly-free, full-dissolution cleaning, convenient operation and short cleaning time, and fundamentally solves the technical problem that a repair factory needs to carry out cleaning.
One of the purposes of the invention is realized by adopting the following technical scheme:
the cleaning agent is characterized by comprising water, a composite corrosion inhibitor, a composite alkali liquor, a surfactant, a suspending agent and a swelling agent; the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100 (2.5-3.5): (7-9): (1-3): (1-3): 0.5-2).
Further, the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100:3:8:2:2: 1.
Further, the composite corrosion inhibitor comprises sodium hydrogen sulfide, urotropine and thiourea, wherein the weight ratio of the sodium hydrogen sulfide to the urotropine to the thiourea is 1:1: 1.
further, the composite alkali liquor comprises sodium carbonate, sodium tripolyphosphate and water glass, and the weight ratio of the sodium carbonate to the sodium tripolyphosphate to the water glass is 55: 35: 10.
further, the surfactant is disodium lauroamphodiacetate.
Further, the suspending agent is a suspending agent SF-1.
Further, the swelling agent is an imidazoline cationic asphalt emulsifier.
The second purpose of the invention is realized by adopting the following technical scheme:
the integral disassembly-free cleaning method for the oil side of the heat exchange equipment is characterized by comprising the following steps of:
the preparation method of the cleaning agent comprises the following steps: adding water with the formula amount into a liquid preparation tank, heating the water to 80-90 ℃, adding the compound corrosion inhibitor, the compound alkali liquor, the surfactant, the suspending agent and the swelling agent with the formula amount, and uniformly stirring to obtain the cleaning agent;
a pipeline connecting step: connecting the oil side of the heat exchange equipment with a liquid distribution tank and a circulating pump to form a circulating system;
washing with a cleaning agent: starting a circulating pump to inject a cleaning agent into the circulating system, and cleaning in a circulating flushing mode; in the circulating flushing process, keeping the temperature of the cleaning agent between 80 and 90 ℃, stopping cleaning after cleaning for 6 to 12 hours, and simultaneously discharging the cleaning waste liquid in the circulating system to a specified position;
a fresh water flushing step: and after the step of flushing the cleaning agent is completed, filling fresh water into the liquid preparation tank, starting the circulating pump to inject the fresh water into the circulating system, and cleaning in a circulating flushing mode, wherein when the pH value of the water outlet end and the pH value of the water inlet end are detected to be equal, the whole cleaning process is completed.
Further, in the cleaning agent washing step, after cleaning for 8 hours, the cleaning agent is recovered to the liquid preparation tank, the cleaning effect is observed, if the cleaning rate reaches the standard, the cleaning is regarded as the end, and if the cleaning rate does not reach the standard, the cleaning agent is continuously injected for cleaning until the cleaning rate reaches the standard.
Furthermore, in the cleaning agent washing step, a method of injecting the cleaning agent at a low position and recycling the cleaning agent at a high position for circular cleaning is adopted.
The invention has the beneficial effects that:
1. the cleaning agent comprises water, a composite corrosion inhibitor, a composite alkali liquor, a surfactant, a suspending agent and a swelling agent, and has the characteristics of good cleaning effect and low corrosivity.
2. The cleaning method comprises a cleaning agent preparation step, a pipeline connection step, a cleaning agent flushing step and a fresh water flushing step, has the advantages of in-situ integral non-dismantling, full-dissolution cleaning, convenient operation and short cleaning time, and fundamentally solves the technical problem that a repair factory needs to carry out cleaning. The cleaning method is suitable for chemical cleaning and descaling of the oil side of various heat exchange devices of various materials, such as plate type, fin type, shell and tube type, sleeve type, jacketed type, floating valve type, sieve plate type, bubble type and the like. The cleaning method fundamentally changes the lagging condition that the traditional cleaning method needs to largely disassemble the equipment and even return the equipment to the factory for treatment, the process can carry out soaking and circular cleaning on the heat exchange equipment at normal temperature and controlled temperature without disassembling in situ, has high cleaning rate and high cleaning speed, and is basically suitable for the in situ disassembly-free cleaning corrosion rate of 0.67g/m of heat exchange equipment made of various materials2H corrosion rate is far lower than GB/T25146, and cleaning rate is more than 98%.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
A cleaning agent comprises water, a composite corrosion inhibitor, a composite alkali liquor, a surfactant, a suspending agent and a swelling agent; the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100 (2.5-3.5): (7-9): (1-3): (1-3): 0.5-2).
As a further embodiment, the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100:3:8:2:2: 1.
As a further embodiment, the composite corrosion inhibitor comprises sodium hydrogen sulfide, urotropin and thiourea, wherein the weight ratio of the sodium hydrogen sulfide to the urotropin to the thiourea is 1:1: 1.
as a further embodiment, the composite alkali liquor comprises sodium carbonate, sodium tripolyphosphate and water glass, and the weight ratio of the sodium carbonate to the sodium tripolyphosphate to the water glass is 55: 35: 10.
as a further embodiment, the surfactant is disodium lauroamphodiacetate.
As a further embodiment, the suspending agent is the suspending agent SF-1.
As a further embodiment, the swelling agent is an imidazoline based cationic asphalt emulsifier.
The integral disassembly-free cleaning method for the oil side of the heat exchange equipment is characterized by comprising the following steps of:
the preparation method of the cleaning agent comprises the following steps: adding water with the formula amount into a liquid preparation tank, heating the water to 80-90 ℃, adding the compound corrosion inhibitor, the compound alkali liquor, the surfactant, the suspending agent and the swelling agent with the formula amount, and uniformly stirring to obtain the cleaning agent;
a pipeline connecting step: connecting the oil side of the heat exchange equipment with a liquid distribution tank and a circulating pump to form a circulating system;
washing with a cleaning agent: starting a circulating pump to inject a cleaning agent into the circulating system, and cleaning in a circulating flushing mode; in the circulating flushing process, keeping the temperature of the cleaning agent between 80 and 90 ℃, stopping cleaning after cleaning for 6 to 12 hours, and simultaneously discharging the cleaning waste liquid in the circulating system to a specified position;
a fresh water flushing step: and after the step of flushing the cleaning agent is completed, filling fresh water into the liquid preparation tank, starting the circulating pump to inject the fresh water into the circulating system, and cleaning in a circulating flushing mode, wherein when the pH value of the water outlet end and the pH value of the water inlet end are detected to be equal, the whole cleaning process is completed.
In a further implementation mode, in the cleaning agent washing step, after cleaning for 8 hours, the cleaning agent is recovered to the liquid preparation box, the cleaning effect is observed, if the cleaning rate reaches the standard, namely the cleaning is considered to be finished, and if the cleaning rate does not reach the standard, the cleaning agent is continuously injected for cleaning until the cleaning rate reaches the standard.
In a further embodiment, the cleaning agent flushing step is a method of injecting the cleaning agent at a low level and recovering the cleaning agent at a high level for cyclic cleaning.
In the following, specific examples of the present invention are described, and raw materials, equipment and the like used in the following examples can be obtained by purchasing them unless otherwise specified.
Example 1
A cleaning agent comprises water, a composite corrosion inhibitor, a composite alkali liquor, a dispersing agent, a wetting agent and a swelling agent; the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100:3:8:2:2: 1.
The composite corrosion inhibitor comprises sodium hydrogen sulfide, urotropine and thiourea, wherein the weight ratio of the sodium hydrogen sulfide to the urotropine to the thiourea is 1:1: 1. the composite alkali liquor comprises sodium carbonate, sodium tripolyphosphate and water glass, wherein the weight ratio of the sodium carbonate to the sodium tripolyphosphate to the water glass is 55: 35: 10.
firstly, the chemical cleaning and scale removal of the oil side of the heat exchange equipment needs to prepare the following equipment and tools:
1. 200L of self-heating functional liquid distribution box;
2. the flow rate is 6-10T, and the pressure is 3-7 kg.f/cm2One clean water pump is reserved;
3. the pressure resistance is 7MPa, and the pressure of the high-pressure air pipe is 20 meters;
4. 2 electric heaters (1 for standby);
5. a filter screen;
6. a plurality of high-pressure air pipes and 1' short steel pipe connectors;
7. distribution boxes, tool boxes;
8. the measuring range is 0-100 ℃ glass thermometer.
Second, inspection of heat exchange equipment
1. And carefully checking the structural type, the material and the integrity of the heat exchange equipment, checking the thickness of the oil dirt on the heated surface and the non-heated surface, and knowing the service life of the heat exchange equipment, the heat exchange working condition before outage, the heat exchange equipment and the checking result record to the first party when the oil dirt covers the ratio, and communicating and confirming the heat exchange equipment with a manager of the first party.
2. And (4) the corrosion condition of the oil side of the heat exchange equipment is communicated and confirmed with an equipment manager on the first side.
Third, chemical cleaning technical requirements
1. The cleaning rate is not less than 95%.
2. The corrosion rate should be in accordance with the industrial equipment chemical cleaning quality acceptance criterion GB/T25146-2010, 5.3.1 to carbon steel is less than or equal to 2g/m2.h, and the corrosion rate to stainless steel, red copper, copper alloy, aluminum and aluminum alloy is less than or equal to 1g/m2.h。
Fourth, brief description of preparation before cleaning
1. And (4) isolating heat exchange equipment (the work is finished by matching with the first party).
2. Opening the heat exchange medium inlet and outlet flanges, and checking the scaling and corrosion conditions.
3. Connecting the process pipeline, injecting the cleaning agent at a low position, and recycling the cleaning agent at a high position for circular cleaning.
4. Connected with a power supply, a heater and a water pump.
5. And a distribution box (non-explosion-proof) is connected, and the power system is 220V/380V.
6. The cleaning circulating pump is connected.
7. And (4) confirming a fresh water source, wherein the consumption of the fresh water is about 4-5 times of the water volume of the heat exchange equipment.
Fifthly, an integral disassembly-free cleaning method for an oil side of heat exchange equipment comprises the following steps:
the integral disassembly-free cleaning method for the oil side of the heat exchange equipment is characterized by comprising the following steps of:
the preparation method of the cleaning agent comprises the following steps: adding water with the formula amount into a liquid preparation tank, heating the water to 80-90 ℃, adding the compound corrosion inhibitor, the compound alkali liquor, the surfactant, the suspending agent and the swelling agent with the formula amount, and uniformly stirring to obtain the cleaning agent;
a pipeline connecting step: connecting the oil side of the heat exchange equipment with a liquid distribution tank and a circulating pump to form a circulating system;
washing with a cleaning agent: starting a circulating pump to inject a cleaning agent into the circulating system, and cleaning in a circulating flushing mode; in the circulating flushing process, keeping the temperature of the cleaning agent between 80 and 90 ℃, after cleaning for 8 hours, recovering the cleaning agent to the liquid preparation box, observing the cleaning effect, if the cleaning rate reaches the standard, namely, the cleaning is finished, and if the cleaning rate does not reach the standard, continuing injecting the cleaning agent for cleaning until the cleaning rate reaches the standard; simultaneously discharging the cleaning waste liquid in the circulating system to a specified position;
a fresh water flushing step: and after the step of flushing the cleaning agent is completed, filling fresh water into the liquid preparation tank, starting the circulating pump to inject the fresh water into the circulating system, and cleaning in a circulating flushing mode, wherein when the pH value of the water outlet end and the pH value of the water inlet end are detected to be equal, the whole cleaning process is completed.
In a further embodiment, the cleaning agent flushing step is a method of injecting the cleaning agent at a low level and recovering the cleaning agent at a high level for cyclic cleaning.
Sixth, acceptance method
1. The acceptance method comprises the following steps: visual inspection is performed on the visible part, and industrial endoscopy can be selected for the invisible part.
2. And (4) acceptance standard: the cleaning rate is more than 95 percent, and GB/T25146 'chemical cleaning quality acceptance criteria for industrial equipment' is implemented.
The cleaning efficiency of this example was found to be 99.2%. The corrosion rate is only 0.67g/m2.h。
Example 2
A cleaning agent comprises water, a composite corrosion inhibitor, a composite alkali liquor, a surfactant, a suspending agent and a swelling agent; the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100:2.5:7:1:1: 0.5.
The preparation method and the whole disassembly-free cleaning method of the cleaning agent in the present example were the same as those in example 1.
The cleaning efficiency of this example was found to be 98.5%. The corrosion rate is only 0.72g/m2.h。
Example 3
A cleaning agent comprises water, a composite corrosion inhibitor, a composite alkali liquor, a surfactant, a suspending agent and a swelling agent; the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100:3:7:1:3: 1.
The preparation method and the whole disassembly-free cleaning method of the cleaning agent in the present example were the same as those in example 1.
The cleaning efficiency of this example was found to be 98.9%. The corrosion rate is only 0.68g/m2.h。
Example 4
A cleaning agent comprises water, a composite corrosion inhibitor, a composite alkali liquor, a surfactant, a suspending agent and a swelling agent; the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100:3.5:9:3:3: 2.
The preparation method and the whole disassembly-free cleaning method of the cleaning agent in the present example were the same as those in example 1.
The cleaning efficiency of this example was found to be 91.6%. The corrosion rate is only 0.75g/m2.h。
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (5)

1. The cleaning agent for the disassembly-free cleaning of the whole oil side of the heat exchange equipment is characterized by being prepared from the following raw materials: water, a composite corrosion inhibitor, a composite alkali liquor, a surfactant, a suspending agent and a swelling agent; the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100 (2.5-3.5): (7-9): (1-3): 0.5-2);
the composite corrosion inhibitor is sodium thiocyanate, urotropine and thiourea, and the weight ratio of the sodium thiocyanate to the urotropine to the thiourea is 1:1: 1;
the composite alkali liquor is composed of sodium carbonate, sodium tripolyphosphate and water glass, and the weight ratio of the sodium carbonate to the sodium tripolyphosphate to the water glass is 55: 35: 10;
the surfactant is disodium lauroyl amphodiacetate, and the suspending agent is a suspending agent SF-1; the swelling agent is an imidazoline cationic asphalt emulsifier.
2. The cleaning agent for the integral disassembly-free cleaning of the oil side of the heat exchange equipment as claimed in claim 1, wherein the volume ratio of the water, the composite corrosion inhibitor, the composite alkali liquor, the surfactant, the suspending agent and the swelling agent is 100:3:8:2:2: 1.
3. The integral disassembly-free cleaning method for the oil side of the heat exchange equipment is characterized by comprising the following steps of:
the process for producing the cleaning agent according to any one of claims 1 to 2, comprising: adding water with the formula amount into a liquid preparation tank, heating the water to 80-90 ℃, adding the compound corrosion inhibitor, the compound alkali liquor, the surfactant, the suspending agent and the swelling agent with the formula amount, and uniformly stirring to obtain the cleaning agent;
a pipeline connecting step: connecting the oil side of the heat exchange equipment with a liquid distribution tank and a circulating pump to form a circulating system;
washing with a cleaning agent: starting a circulating pump to inject a cleaning agent into the circulating system, and cleaning in a circulating flushing mode; in the circulating flushing process, keeping the temperature of the cleaning agent between 80 and 90 ℃, stopping cleaning after cleaning for 6 to 12 hours, and simultaneously discharging the cleaning waste liquid in the circulating system to a specified position;
a fresh water flushing step: and after the step of flushing the cleaning agent is completed, filling fresh water into the liquid preparation tank, starting the circulating pump to inject the fresh water into the circulating system, and cleaning in a circulating flushing mode, wherein when the pH value of the water outlet end is detected to be consistent with that of the water inlet end, the whole cleaning process is completed.
4. The method for integrally cleaning the oil side of the heat exchange equipment as claimed in claim 3, wherein in the cleaning step, after 8 hours of cleaning, the cleaning agent is recovered to the liquid distribution tank, the cleaning effect is observed, if the cleaning rate reaches the standard, namely the cleaning is considered to be finished, and if the cleaning rate does not reach the standard, the cleaning agent is continuously injected for cleaning until the cleaning rate reaches the standard.
5. The integral disassembly-free cleaning method for the oil side of the heat exchange equipment as claimed in claim 3, wherein in the cleaning agent washing step, a method of injecting the cleaning agent at a low position and recycling the cleaning agent at a high position is adopted for circular cleaning.
CN201810686325.8A 2018-06-28 2018-06-28 Cleaning agent and integral disassembly-free cleaning method for oil side of heat exchange equipment Active CN109023393B (en)

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CN109023393B true CN109023393B (en) 2021-05-04

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1075164A (en) * 1993-03-04 1993-08-11 朱几 Efficient and multi-purpose liquid detergent
CN103060128A (en) * 2011-10-21 2013-04-24 汤治强 Fragrant cleaning agent

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1075164A (en) * 1993-03-04 1993-08-11 朱几 Efficient and multi-purpose liquid detergent
CN103060128A (en) * 2011-10-21 2013-04-24 汤治强 Fragrant cleaning agent

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