CN111282904A - Environment-friendly cleaning process based on micro-nano bubbles - Google Patents
Environment-friendly cleaning process based on micro-nano bubbles Download PDFInfo
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- CN111282904A CN111282904A CN202010232548.4A CN202010232548A CN111282904A CN 111282904 A CN111282904 A CN 111282904A CN 202010232548 A CN202010232548 A CN 202010232548A CN 111282904 A CN111282904 A CN 111282904A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention relates to a green cleaning process based on micro-nano bubbles. The method comprises the following steps of (1) injecting water into the industrial equipment to be cleaned and carrying out temporary system leakage detection; (2) injecting a weakly acidic cleaning agent into the industrial equipment to be cleaned, wherein the injection amount is determined by calculation according to the total scale amount or the cleaning area; (3) filling water into the industrial equipment to be cleaned; (4) connecting the industrial equipment to be cleaned with a circulating cleaning device; (5) starting a cleaning device, and injecting micro-nano bubbles into the cleaning liquid while the cleaning water pump is running; (6) changing forward circulation cleaning into reverse circulation cleaning after a certain time and continuing for a certain time; (7) the cleaning process is ended. According to the invention, the micro-nano bubbles are injected into the cleaning solution in the circulating cleaning process, so that the cleaning efficiency is improved, the time required by cleaning is shortened, and the cleaning effect is improved. The cleaning process has low energy consumption and does not cause environmental protection problem.
Description
Technical Field
The invention belongs to the technical field of industrial equipment cleaning, and particularly relates to a micro-nano bubble-based green cleaning process.
Background
Chemical cleaning is required to be carried out on various industrial equipment at regular intervals, and dirt and corrosion problems generally exist in the industrial equipment, particularly various heat exchange equipment after a period of time, due to the influence of heat transfer and water quality. After the problems occur, various problems such as resistance increase, heat exchange efficiency reduction, even performance failure and the like can be caused, and the safe and economic operation of the system can be influenced in severe cases.
At present, the cleaning method commonly used in engineering mainly comprises two technologies of physical cleaning and chemical cleaning. Physical cleaning techniques are generally methods that use mechanical or hydraulic forces to remove dirt from the surface of the air preheater. Chemical cleaning is a cleaning method in which dirt on the surface of an object is dissolved and dispersed in a liquid by a chemical agent or an aqueous solution thereof chemically reacting with the dirt.
Physical cleaning has no corrosion effect on equipment, but the physical cleaning has the defect that only the part which has a simple structure and can be reached by the acting force can be cleaned. When the interior of equipment with a complex structure needs to be cleaned, the equipment needs to be disassembled or disintegrated. The cleaning time is also longer. The chemical cleaning removes dirt mainly by the reaction capability of the cleaning agent, the chemical cleaning can be generally cleaned by adopting circular flow, and even if the equipment has a complex structure, the equipment does not need to be disassembled or disintegrated.
The specification of chinese utility model patent with publication number CN208579674U discloses a water heat exchanger cleaning device, this cleaning device including be provided with the liquid reserve tank of acid solution in, first end with the first pipeline of the first end intercommunication of liquid reserve tank intercommunication, second end and the heat transfer pipeline of heat exchanger is provided with the water pump on first pipeline, still include first end and the heat transfer pipeline's of heat exchanger second end intercommunication, second end and liquid reserve tank intercommunication second pipeline. The cleaning device has the following principle: the weak acidic solution is conveyed into a heat exchange pipeline of the heat exchanger under the action of a water pump to clean the hard dirt of the heat exchange element, so that the weak acidic solution is fully contacted with the hard dirt attached to the heat exchange element of the heat exchanger and performs chemical reaction, and the hard dirt is ensured to be dispersed and dissolved.
The cleaning process disclosed in the patent only adopts a working mode that an acid solution flows through the industrial equipment to be cleaned, and because dirt in a stroke is usually compact, the dirt is difficult to be quickly dissolved and peeled off due to the action of acid liquor reaction and flowing scouring, so that the cleaning efficiency of the industrial equipment is reduced, and the cleaning effect is poor. Therefore, the cleaning process needs to be researched and developed, a new process design scheme is provided, and the problems existing in the existing cleaning process are solved.
Disclosure of Invention
The invention provides a micro-nano bubble-based green cleaning process which is used for improving the cleaning efficiency and the cleaning effect, is low in energy consumption and does not generate the environmental protection problem in order to solve the technical problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a green cleaning process based on micro-nano bubbles comprises the following steps of (1) injecting water into industrial equipment to be cleaned and carrying out temporary system leakage detection; (2) injecting a weakly acidic cleaning agent into the industrial equipment to be cleaned, wherein the injection amount is determined by calculation according to the total scale amount or the cleaning area; (3) filling water into the industrial equipment to be cleaned; (4) connecting the industrial equipment to be cleaned with a circulating cleaning device; (5) starting a cleaning device, and injecting micro-nano bubbles into the cleaning liquid while the cleaning water pump is running; (6) changing forward circulation cleaning into reverse circulation cleaning after a certain time and continuing for a certain time; (7) the cleaning process is ended.
The invention has the advantages and positive effects that: compared with the existing cleaning process, the micro-nano bubble injection cleaning liquid has the advantages that the micro-nano bubble injection cleaning liquid is injected into the cleaning liquid in the circulating cleaning process, the micro-nano bubble rising speed in the cleaning liquid is low, the micro-nano bubble can enter the micro-pores of dirt under the combined action of water pressure and a medicament, and the scale is loosened through the tension of the micro-nano bubble, so that the cleaning efficiency is improved, the cleaning time is shortened, the dirt is removed more thoroughly through the micro-nano bubble, and the cleaning effect is improved. The cleaning process reduces the damage of the cleaning link to the metal surface of the industrial equipment, and has low corrosion rate; due to the introduction of the micro-nano bubbles, the cleaning process reduces the use of cleaning agents, and saves cleaning agents compared with the conventional circulating cleaning process; the cleaning process does not need to adopt a large-flow cleaning water pump, and reduces the consumption of electric energy. The cleaning process uses less cleaning agents, can fully utilize the complexing ability of weak acid cleaning agents (such as organic acid and the like) to remove scale and can be degraded, so the cleaning solution is environment-friendly and cannot cause the problem of environmental protection.
Preferably: the amount of water injected into the industrial equipment to be cleaned in the step (1) is 30% of the volume of the industrial equipment, and the step is carried out at normal temperature.
Preferably: and (3) filling water into the industrial equipment to be cleaned until the air release pipe at the top of the equipment is exposed to water, and keeping an air valve on the air release pipe in a normally open state.
Preferably: and (5) injecting micro-nano bubbles by using a dissolved air pump.
Preferably: in the step (5), the micro-nano bubbles in the cleaning solution account for 10-15% of the total circulating amount of the cleaning solution by volume.
Preferably: in the step (6), the forward circulation cleaning lasts for 6-8h, and the reverse circulation cleaning lasts for 6-8 h.
Preferably: and (4) in the forward circulating cleaning process and the reverse circulating cleaning process in the step (6), monitoring the pH value of the cleaning solution and adjusting the pH value of the cleaning solution according to the pH value.
Preferably: the operation of pH value monitoring is carried out once per hour, if the pH value is more than or equal to 4.0, sewage is discharged through a separator of the cleaning device, cleaning agents are supplemented after sewage discharge, water is filled again, and the pH value of the cleaning agent is ensured to be less than 4.0.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are described in detail.
The invention discloses a micro-nano bubble-based green cleaning process, which comprises the following steps,
(1) and injecting water into the industrial equipment to be cleaned, and performing temporary system leakage detection, wherein in the step, the water injection amount into the industrial equipment to be cleaned is 30% of the volume of the industrial equipment, and the step is performed at normal temperature.
(2) Injecting a weakly acidic cleaning agent into the industrial equipment to be cleaned, wherein the injection amount is determined by calculation according to the total scale amount or the cleaning area; estimating the total scale amount in the industrial equipment to be cleaned or measuring the total cleaning area, calculating the dosage of the weakly acidic cleaning agent to be added by combining empirical data, weighing and measuring the dosage, and injecting the dosage into the industrial equipment to be cleaned at one time.
(3) Filling water into the industrial equipment to be cleaned; in the step, water is filled into the industrial equipment to be cleaned until the blow-off pipe at the top of the equipment is full of water (the blow-off pipe indicates that the inner cavity is full of water), and an air valve on the blow-off pipe is kept in a normally open state, so that gas generated in the cleaning process can be discharged out of the industrial equipment through the blow-off pipe and the blow-off valve, and the pressure rise caused by gas accumulation inside the industrial equipment is avoided.
(4) Connecting the industrial equipment to be cleaned with a circulating cleaning device; the cleaning equipment during circulation comprises a cleaning water pump, a separator, necessary pipelines and valves, wherein the cleaning water pump is used for providing flowing power for the cleaning liquid, the separator is used for separating solid particles (formed by peeling and separating dirt in industrial equipment) in the cleaning liquid to keep the cleaning liquid in a relatively clean state, and the pipelines and the valves are used for guiding the cleaning liquid and controlling on and off.
(5) Starting a cleaning device, and injecting micro-nano bubbles into the cleaning liquid while the cleaning water pump is running; under the action of a cleaning water pump, cleaning liquid circularly flows between the industrial equipment to be cleaned and the separator, the cleaning liquid is in a state of being rich in micro-nano bubbles after the micro-nano bubbles are injected into the cleaning liquid, and dirt in the industrial equipment is cleaned by utilizing the characteristics of the micro-nano bubbles and matching with cleaning agents.
In this step, a dissolved air pump can be used to inject micro-nano bubbles. Because belt cleaning device has set up the washing water pump, consequently dissolved air pump can establish ties with the washing water pump and set up, and the washing liquid that washs water pump transport promptly gets into dissolved air pump after, pours into the washing liquid into behind the micro-nano bubble of air formation by dissolved air pump. The dissolved air pump is also one of the liquid delivery pumps, so the cleaning water pump of the cleaning device can be replaced by the dissolved air pump.
The dissolved air pump is used for providing power for the flowing of the cleaning liquid and simultaneously sucking air to form micro-nano bubbles, a suction inlet of the dissolved air pump can suck external air by utilizing the negative pressure effect, and the liquid and the air are mixed and stirred by the pump impeller rotating at a high speed, so that a stirrer and a mixer are not needed, and the gas and the liquid are fully dissolved due to the pressurization and mixing in the pump.
The dissolved air pump mixes air into the cleaning liquid to form rich micro-nano bubbles in the working process, the micro-nano bubbles refer to micro bubbles existing in the cleaning liquid, when the diameters of the bubbles are smaller than 100 micrometers, the bubbles with the diameters smaller than 100nm are called as nano bubbles, the micro-nano bubbles refer to bubbles with the diameters ranging from tens of micrometers to hundreds of nanometers when the bubbles occur, the bubbles are between the micro bubbles and the nano bubbles, and the dissolved air pump has physical and chemical characteristics which are not possessed by conventional bubbles.
The micro-nano bubble possesses: a. the specific surface area is large; b. the rising speed is slow; c. pressurizing and dissolving; d. surface charging; e. a large number of free radicals are generated; f. the green cleaning process fully utilizes the characteristics of high gas dissolution rate to clean the dirt in the industrial equipment.
In the step, the micro-nano bubbles in the cleaning solution account for 10-15% of the total circulation amount of the cleaning solution, namely the volume of the micro-nano bubbles accounts for 10-15% of the total volume in unit volume flow.
(6) Changing forward circulation cleaning into reverse circulation cleaning after a certain time and continuing for a certain time; in the step, the forward circulating cleaning lasts for 6-8h, the reverse circulating cleaning lasts for 6-8h, and the forward circulating cleaning mode and the reverse circulating cleaning mode can enable the softened and peeled dirt to be washed by cleaning liquids in different flow directions, so that the peeling and separation of the dirt can be accelerated.
In the cleaning process, the content of the effective cleaning agent in the cleaning liquid is gradually reduced along with the reaction with dirt, and the index is that the pH value of the cleaning liquid is increased. In the initial state, the whole cleaning solution is acidic, namely the pH value is less than 4.0, and the pH value is increased along with the progress of the cleaning process, so that the cleaning capacity is correspondingly reduced. Therefore, in the cleaning process, a step of monitoring the pH value of the cleaning solution and adjusting the pH value of the cleaning solution according to the pH value should be further included, and this step is performed along with the forward circulation cleaning and the reverse circulation cleaning in step (6).
In this embodiment, the operation of pH monitoring is performed once per hour, and the operation of pH monitoring may be performed by manual sampling, or an online pH monitor may be provided on the circulation path of the cleaning apparatus.
The specific cleaning solution pH value adjusting method comprises the following steps: if the pH value is more than or equal to 4.0, sewage is discharged through a sewage discharge outlet of a separator of the cleaning device (a certain amount of cleaning liquid can be discharged while separated particulate matter impurities are discharged, so that the total amount of the cleaning agent is further reduced), a cleaning agent is supplemented after sewage discharge, water is refilled, and the pH value of the cleaning agent is ensured to be less than 4.0.
(7) The cleaning process is ended.
Description of cleaning principle:
1. fouling in industrial equipment tends to become a result of the formation of particulates such as algae and dust, which are not very dense.
2. The weakly acidic organic cleaning agent is adopted, the characteristic of non-compactness is fully utilized, scale is peeled and decomposed through the functions of permeation, dispersion, chelation and the like, and the corrosion rate to metal is low.
3. The micro-nano bubbles rise slowly in water and can enter the micropores of the dirt under the action of water pressure and a medicament, and the dirt is loosened by the tension of the micro-nano bubbles.
4. When the pH value of the cleaning solution is low, a large amount of free radicals can be excited to be generated. The free radicals have super strong oxidation effect and can accelerate the chemical reaction of the cleaning agent and the scale.
Description of cleaning method:
since industrial equipment is generally difficult to disassemble and move as a whole, the cleaning process can be performed in an on-line cleaning manner. Namely, the splitting of the original industrial equipment is isolated, the industrial equipment to be cleaned is disconnected from other pipelines, and the cleaning device is arranged near the industrial equipment to be cleaned and connected with the cleaning pipelines. And then starting the cleaning equipment to clean, removing the connection between the temporary cleaning device and the industrial equipment after cleaning is finished, and restoring the connection between the cleaned industrial equipment and the pipeline of the original system, namely restoring the previous system.
The cleaning process is called as a green cleaning process because compared with the prior cleaning process: (1) less cleaning agent is used; (2) the complexing ability of weak acidic cleaning agents (such as organic acid and the like) is fully utilized for descaling, the cleaning agent is degradable, and the problem of environmental protection is not caused by the cleaning liquid.
The green cleaning process reduces the damage of the cleaning link to the metal surface of the industrial equipment, and the corrosion rate is less than 50 percent of the national cleaning standard; the green cleaning process reduces the use of cleaning agents, and saves more than 30 percent of the cleaning agents compared with the conventional circulating cleaning process; the cleaning liquid of the green cleaning process can remove the scale by depending on the complexing ability of the organic acid, is degradable and does not cause the environmental protection problem; according to the green cleaning process, the micro-tension effect of the micro-nano bubbles improves the descaling efficiency and shortens the cleaning time; the green cleaning process does not need to clean the water pump at a large flow, and reduces the consumption of electric energy.
Claims (8)
1. A green cleaning process based on micro-nano bubbles is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) injecting water into the industrial equipment to be cleaned and carrying out temporary system leakage detection;
(2) injecting a weakly acidic cleaning agent into the industrial equipment to be cleaned, wherein the injection amount is determined by calculation according to the total scale amount or the cleaning area;
(3) filling water into the industrial equipment to be cleaned;
(4) connecting the industrial equipment to be cleaned with a circulating cleaning device;
(5) starting a cleaning device, and injecting micro-nano bubbles into the cleaning liquid while the cleaning water pump is running;
(6) changing forward circulation cleaning into reverse circulation cleaning after a certain time and continuing for a certain time;
(7) the cleaning process is ended.
2. The micro-nano bubble based green cleaning process as claimed in claim 1, which is characterized in that: the amount of water injected into the industrial equipment to be cleaned in the step (1) is 30% of the volume of the industrial equipment, and the step is carried out at normal temperature.
3. The micro-nano bubble based green cleaning process as claimed in claim 2, which is characterized in that: and (3) filling water into the industrial equipment to be cleaned until the air release pipe at the top of the equipment is exposed to water, and keeping an air valve on the air release pipe in a normally open state.
4. The micro-nano bubble based green cleaning process as claimed in claim 3, which is characterized in that: and (5) injecting micro-nano bubbles by using a dissolved air pump.
5. The micro-nano bubble based green cleaning process as claimed in claim 4, which is characterized in that: in the step (5), the micro-nano bubbles in the cleaning solution account for 10-15% of the total circulating amount of the cleaning solution by volume.
6. The micro-nano bubble based green cleaning process as claimed in claim 5, which is characterized in that: in the step (6), the forward circulation cleaning lasts for 6-8h, and the reverse circulation cleaning lasts for 6-8 h.
7. The micro-nano bubble based green cleaning process as claimed in claim 6, which is characterized in that: and (4) in the forward circulating cleaning process and the reverse circulating cleaning process in the step (6), monitoring the pH value of the cleaning solution and adjusting the pH value of the cleaning solution according to the pH value.
8. The micro-nano bubble based green cleaning process according to claim 7, which is characterized in that: the operation of pH value monitoring is carried out once per hour, if the pH value is more than or equal to 4.0, sewage is discharged through a separator of the cleaning device, cleaning agents are supplemented after sewage discharge, water is filled again, and the pH value of the cleaning agent is ensured to be less than 4.0.
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| CN202010232548.4A CN111282904A (en) | 2020-03-28 | 2020-03-28 | Environment-friendly cleaning process based on micro-nano bubbles |
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| CN202010232548.4A CN111282904A (en) | 2020-03-28 | 2020-03-28 | Environment-friendly cleaning process based on micro-nano bubbles |
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| JP2003262494A (en) * | 2002-03-07 | 2003-09-19 | Ebara Shinwa Ltd | Scale dissolving and removing method in cooling tower and its device |
| CN104048556A (en) * | 2014-06-24 | 2014-09-17 | 郑州赛为机电设备有限公司 | Pulse circulation cleaning device for heat exchanger and using method thereof |
| CN106140714A (en) * | 2016-06-23 | 2016-11-23 | 中国科学院上海高等研究院 | The circulating micro-nano air-bubble of kinetic pump washes out the method and device of hydrology thing |
| CN206113759U (en) * | 2016-08-18 | 2017-04-19 | 华能新华发电有限责任公司 | Online cleaning system of condenser |
| CN208579674U (en) * | 2018-06-20 | 2019-03-05 | 北京首钢股份有限公司 | A kind of shell-and-tube heat exchanger cleaning device |
| CN110465215A (en) * | 2018-05-12 | 2019-11-19 | 浙江优普生精密电子有限公司 | A kind of micro-nano bubble generator |
-
2020
- 2020-03-28 CN CN202010232548.4A patent/CN111282904A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003262494A (en) * | 2002-03-07 | 2003-09-19 | Ebara Shinwa Ltd | Scale dissolving and removing method in cooling tower and its device |
| CN104048556A (en) * | 2014-06-24 | 2014-09-17 | 郑州赛为机电设备有限公司 | Pulse circulation cleaning device for heat exchanger and using method thereof |
| CN106140714A (en) * | 2016-06-23 | 2016-11-23 | 中国科学院上海高等研究院 | The circulating micro-nano air-bubble of kinetic pump washes out the method and device of hydrology thing |
| CN206113759U (en) * | 2016-08-18 | 2017-04-19 | 华能新华发电有限责任公司 | Online cleaning system of condenser |
| CN110465215A (en) * | 2018-05-12 | 2019-11-19 | 浙江优普生精密电子有限公司 | A kind of micro-nano bubble generator |
| CN208579674U (en) * | 2018-06-20 | 2019-03-05 | 北京首钢股份有限公司 | A kind of shell-and-tube heat exchanger cleaning device |
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Application publication date: 20200616 |