CN103512421A - Method for cleaning scales of heat exchanger - Google Patents
Method for cleaning scales of heat exchanger Download PDFInfo
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- CN103512421A CN103512421A CN201310461456.3A CN201310461456A CN103512421A CN 103512421 A CN103512421 A CN 103512421A CN 201310461456 A CN201310461456 A CN 201310461456A CN 103512421 A CN103512421 A CN 103512421A
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Abstract
The invention discloses a method for cleaning scales of a heat exchanger, and relates to a heat exchange device in the production process of aluminum oxide, in particular to a cleaning method for a heat exchange device of which a cold source uses water as a cooling medium in the production process of aluminum oxide. The method is characterized in that in the cleaning process, after the scaled heat exchanger is boiled in alkali liquor in a heated mode, the steps of water cleaning, acid pickling and water cleaning are carried out. For phase compositions of the scales, difficult to dissolve, on the cold source side, the method for cleaning the scales of the heat exchanger integrates alkali boiling, acid pickling and water cleaning, integrates static circulation and dynamic circulation, can achieve an ideal cleaning effect, and greatly overcomes the defects that a traditional cleaning scheme device is serious in corrosion and not good in cleaning effect; after the heat exchanger is cleaned according to the new method, operation period is prolonged obviously, and the number of yearly cleaning times is decreased obviously.
Description
Technical field
A cleaning method for fouling of heat exchangers, relates in a kind of heat transmission equipment, particularly aluminum oxide production process of aluminum oxide production process low-temperature receiver and take the cleaning method of water as cooling media for heat exchange equipment.
Background technology
Heat transmission equipment is that in aluminum oxide production process, requisite equipment, particularly low-temperature receiver be take water as cooling media heat exchanger, and in seminal fluid cooling system Ji Zhongfen decomposition region, application is very extensive.Particularly, for decomposing system, cooling system has a significant impact the quality of the technical-economic index of seed decomposable process and product, in order to ensure compared with high de-agglomeration rate in the situation that, obtains the good product of quality, and the operating condition of cooling heat transmission equipment must guarantee.
The fouling of thermal source material side has ripe cleaning system always, and the scale problems of low-temperature receiver water side is the main cause that affects heat transfer effect always, and while particularly leaking within heat transmission equipment occurs, low-temperature receiver side forms indissoluble fouling.The salpeter solution of traditional cleaning method 7%～10% cleans 12～15 hours, when concentration is high, also cause pump bowl flange leakage, mechanical seal leakage, bearing heating, impeller corrosion etc., when concentration is low, do not reach the cleaning performance of expection, when serious, cause low-temperature receiver side to occur clogging, when reducing heat transfer effect, have a strong impact on the cycle of operation.
Summary of the invention
Object of the present invention is exactly the deficiency existing for above-mentioned prior art, provides a kind of and can effectively improve cleaning performance, reduces cleaning frequency, extends the cleaning method of the fouling of heat exchangers of the heat transmission equipment cycle of operation.
The object of the invention is to be achieved through the following technical solutions.
A cleaning method for fouling of heat exchangers, is characterized in that its cleaning process is fouling heat exchanger to be carried out in alkali lye after heat boils, then wash, pickling, water-washing step.
The cleaning method of a kind of fouling of heat exchangers of the present invention, is characterized in that described carry out heat to boil the alkali lye of process being sodium hydroxide solution, and its concentration is 250～320g/l, and it is 80～100 ℃ that heat is boiled temperature, and the time is 8～12 hours; After soda boiling completes, salkali waste is drained to water purification punching to going out water ph value for neutral.
The cleaning method of a kind of fouling of heat exchangers of the present invention, is characterized in that carrying out acid cleaning process, is the salpeter solution that is 3%～4% by concentration, first static immersing 2 hours, and then dynamic circulation is 3～4 hours.
The cleaning method of a kind of fouling of heat exchangers of the present invention, is characterized in that washing after pickling, until drain acid solution and residue in heat exchanger.
The cleaning method of a kind of fouling of heat exchangers of the present invention, phase for low-temperature receiver side complicated difficult cementing dirt forms, propose a kind ofly to propose soda boiling and add the cleaning method that acid washing and water washing, static state add dynamic circulation, can reach desirable cleaning performance, there is very big improvement overcoming conventional clean system equipment corrosion drawback serious and that cleaning performance is bad, after adopting new method to clean, the cycle of operation obviously extends, and year wash number is obviously by low.
The specific embodiment
A cleaning method for fouling of heat exchangers, its cleaning process is fouling heat exchanger to be carried out in alkali lye after heat boils, then wash, pickling, water-washing step.
A cleaning method for fouling of heat exchangers, be by low-temperature receiver side indissoluble fouling carry out material phase analysis, find that calcium except conventional impurity, the excessive formation of the water hardness scabs, also have because leaking the harder fouling of quality that brings aluminium oxide to form in equipment.By adopting soda boiling to add the novel technique for cleaning that acid washing and water washing, static state add dynamic circulation: first carry out soda boiling while cleaning, low-temperature receiver is 250～320g/l for side, the alkali lye that temperature is 80～100 ℃ carries out the soda boiling of 8～12 hours, in alkali lye, makes fouling loose alumina dissolution in fouling.After soda boiling completes, salkali waste is drained to water purification punching to after going out water ph value and being neutrality, emptied of water; Carry out pickling again, with the salpeter solution of concentration 3～4%, replace 7%～10% salpeter solution before, the method that adopts static immersing and dynamic circulation to combine is carried out pickling, and pickling time is first static immersing 2 hours, and then dynamic circulation is 3～4 hours.In acid cleaning process, strengthen monitoring, frequent sample examination pickling concentration, when adjacent twice chemical examination concentration difference is lower than 0.2% time, can think that pickling reaction finishes.After pickling finishes, comprehensive utilization after pickle heat extraction electrochemistry workshop is processed; Finally utilize the mode heat exchanger of dynamic circulation to wash, until drain acid solution and residue in wide-runner plate heat exchanger.
Embodiment 1
By the wide-runner plate heat exchanger of aluminum oxide production process, low-temperature receiver side 250g/l, the sodium hydroxide solution that temperature is 100 ℃ carries out the soda boiling of 8 hours, in alkali lye, makes fouling loose alumina dissolution in fouling.After soda boiling completes, salkali waste is drained to water purification punching to after going out water ph value and being neutrality, emptied of water; Carry out pickling, the salpeter solution by concentration 4%, carries out pickling again, and pickling time is first static immersing 2 hours, and then dynamic circulation is 3 hours.In acid cleaning process, strengthen monitoring, frequent sample examination pickling concentration, when adjacent twice chemical examination concentration difference is lower than 0.2% time, can think that pickling reaction finishes.After pickling finishes, comprehensive utilization after pickle heat extraction electrochemistry workshop is processed; Finally utilize the mode heat exchanger of dynamic circulation to wash, until drain acid solution and residue in wide-runner plate heat exchanger.
After adopting former descaling method to clean, most of fouling is not removed, and after adopting said method to clean, fouling has obtained thorough removing.New technology clean after low-temperature receiver side inflow be 1.3 times of inflow after conventional clean, effectively guaranteed the operational effect of heat transmission equipment after cleaning, heat transfer effect obviously improves.
Embodiment 2
By the wide-runner plate heat exchanger of aluminum oxide production process, low-temperature receiver side 320g/l, the sodium hydroxide solution that temperature is 80 ℃ carries out the soda boiling of 12 hours, in alkali lye, makes fouling loose alumina dissolution in fouling.After soda boiling completes, salkali waste is drained to water purification punching to after going out water ph value and being neutrality, emptied of water; Carry out pickling, the salpeter solution by concentration 3～4%, carries out pickling again, and pickling time is first static immersing 2 hours, and then dynamic circulation is 4 hours.In acid cleaning process, strengthen monitoring, frequent sample examination pickling concentration, when adjacent twice chemical examination concentration difference is lower than 0.2% time, can think that pickling reaction finishes.After pickling finishes, comprehensive utilization after pickle heat extraction electrochemistry workshop is processed; Finally utilize the mode heat exchanger of dynamic circulation to wash, until drain acid solution and residue in wide-runner plate heat exchanger.
After adopting former descaling method to clean, most of fouling is not removed, and after adopting said method to clean, fouling has obtained thorough removing.New technology clean after low-temperature receiver side inflow be 1.6 times of inflow after conventional clean, effectively guaranteed the operational effect of heat transmission equipment after cleaning, heat transfer effect obviously improves.
Embodiment 3
By the wide-runner plate heat exchanger of aluminum oxide production process, low-temperature receiver side 300g/l, the sodium hydroxide solution that temperature is 90 ℃ carries out the soda boiling of 10 hours, in alkali lye, makes fouling loose alumina dissolution in fouling.After soda boiling completes, salkali waste is drained to water purification punching to after going out water ph value and being neutrality, emptied of water; Carry out pickling, the salpeter solution by concentration 3.5%, carries out pickling again, and pickling time is first static immersing 2 hours, and then dynamic circulation is 3.5 hours.In acid cleaning process, strengthen monitoring, frequent sample examination pickling concentration, when adjacent twice chemical examination concentration difference is lower than 0.2% time, can think that pickling reaction finishes.After pickling finishes, comprehensive utilization after pickle heat extraction electrochemistry workshop is processed; Finally utilize the mode heat exchanger of dynamic circulation to wash, until drain acid solution and residue in wide-runner plate heat exchanger.
After adopting former descaling method to clean, most of fouling is not removed, and after adopting said method to clean, fouling has obtained thorough removing.New technology clean after low-temperature receiver side inflow be 1.5 times of inflow after conventional clean, effectively guaranteed the operational effect of heat transmission equipment after cleaning, heat transfer effect obviously improves.
Claims (4)
1. a cleaning method for fouling of heat exchangers, is characterized in that its cleaning process is fouling heat exchanger to be carried out in alkali lye after heat boils, then wash, pickling, water-washing step.
2. the cleaning method of a kind of fouling of heat exchangers according to claim 1, is characterized in that described carry out heat to boil the alkali lye of process being sodium hydroxide solution, and its concentration is 250～320g/l, and it is 80～100 ℃ that heat is boiled temperature, and the time is 8～12 hours; After soda boiling completes, salkali waste is drained to water purification punching to going out water ph value for neutral.
3. the cleaning method of a kind of fouling of heat exchangers according to claim 1, is characterized in that carrying out acid cleaning process, is the salpeter solution that is 3%～4% by concentration, first static immersing 2 hours, and then dynamic circulation is 3～4 hours.
4. the cleaning method of a kind of fouling of heat exchangers according to claim 1, is characterized in that washing after pickling, until drain acid solution and residue in heat exchanger.
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| CN201310461456.3A CN103512421A (en) | 2013-10-08 | 2013-10-08 | Method for cleaning scales of heat exchanger |
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| CN201310461456.3A CN103512421A (en) | 2013-10-08 | 2013-10-08 | Method for cleaning scales of heat exchanger |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104668256A (en) * | 2015-03-07 | 2015-06-03 | 安徽方兴科技股份有限公司 | Descaling method for etching machine |
| CN104807369A (en) * | 2015-04-21 | 2015-07-29 | 梧州市海邦科技有限公司 | Method for cleaning contaminants at inner wall of boiler |
| CN108050882A (en) * | 2017-12-08 | 2018-05-18 | 攀枝花钢企欣宇化工有限公司 | A kind of on-line cleaning method of titanium plate heat exchanger |
| CN108179075A (en) * | 2017-12-26 | 2018-06-19 | 大连广泰源环保科技有限公司 | A kind of cleaning agent, preparation method and the usage suitable for garbage leachate evaporator |
| CN110746989A (en) * | 2019-10-30 | 2020-02-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Coke oven gas cooler and cleaning method |
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| JP2001099596A (en) * | 1999-09-29 | 2001-04-13 | Hisaya Matsuo | Method for cleaning plate of plate type heat exchanger |
| CN102052880A (en) * | 2009-11-05 | 2011-05-11 | 中国铝业股份有限公司 | Method for cleaning scales on plate type heat exchanger |
| CN102114484A (en) * | 2010-01-04 | 2011-07-06 | 上海佳田药用包装有限公司 | Cleaning method of aluminium hard tube |
| CN102519302A (en) * | 2011-12-14 | 2012-06-27 | 无锡中彩科技有限公司 | Cleaning method for heat exchanger |
| CN102899952A (en) * | 2011-07-24 | 2013-01-30 | 陈明林 | Descaling method for plate-type falling-film evaporator |
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2013
- 2013-10-08 CN CN201310461456.3A patent/CN103512421A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001099596A (en) * | 1999-09-29 | 2001-04-13 | Hisaya Matsuo | Method for cleaning plate of plate type heat exchanger |
| CN102052880A (en) * | 2009-11-05 | 2011-05-11 | 中国铝业股份有限公司 | Method for cleaning scales on plate type heat exchanger |
| CN102114484A (en) * | 2010-01-04 | 2011-07-06 | 上海佳田药用包装有限公司 | Cleaning method of aluminium hard tube |
| CN102899952A (en) * | 2011-07-24 | 2013-01-30 | 陈明林 | Descaling method for plate-type falling-film evaporator |
| CN102519302A (en) * | 2011-12-14 | 2012-06-27 | 无锡中彩科技有限公司 | Cleaning method for heat exchanger |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104668256A (en) * | 2015-03-07 | 2015-06-03 | 安徽方兴科技股份有限公司 | Descaling method for etching machine |
| CN104807369A (en) * | 2015-04-21 | 2015-07-29 | 梧州市海邦科技有限公司 | Method for cleaning contaminants at inner wall of boiler |
| CN108050882A (en) * | 2017-12-08 | 2018-05-18 | 攀枝花钢企欣宇化工有限公司 | A kind of on-line cleaning method of titanium plate heat exchanger |
| CN108179075A (en) * | 2017-12-26 | 2018-06-19 | 大连广泰源环保科技有限公司 | A kind of cleaning agent, preparation method and the usage suitable for garbage leachate evaporator |
| CN110746989A (en) * | 2019-10-30 | 2020-02-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Coke oven gas cooler and cleaning method |
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Application publication date: 20140115 |