CN104406452B - The cleaning method of nickel heat exchanger incrustation scale - Google Patents
The cleaning method of nickel heat exchanger incrustation scale Download PDFInfo
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- CN104406452B CN104406452B CN201410648512.9A CN201410648512A CN104406452B CN 104406452 B CN104406452 B CN 104406452B CN 201410648512 A CN201410648512 A CN 201410648512A CN 104406452 B CN104406452 B CN 104406452B
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Abstract
The invention belongs to industrial equipment and clean field, be specifically related to a kind of cleaning method of nickel heat exchanger incrustation scale. Technical problem to be solved by this invention is to provide a kind of cleaning method of simple to operate, the nickel heat exchanger incrustation scale that do not need disassembly, cleaning. The technical solution adopted in the present invention is for first by pickling after heat exchanger alkali cleaning, pickle is in mass fraction, the aqueous solution of phosphoric acid 5%～10%, sulfamic acid 5%～10%, surfactant 0.1%～0.3%, restrainer 0.25%～0.3%, then rinsing, Passivation Treatment. Adopt technical solution of the present invention can effectively clean nickel heat exchanger recirculated water dirt, the inconvenience that simultaneously having avoided stopping production dismounting brings and manpower, the consumption of materials. Meanwhile, technical solution of the present invention is simple, and cost is low, is suitable for promoting.
Description
Technical field
The invention belongs to industrial equipment and clean field, be specifically related to a kind of cleaning method of nickel heat exchanger incrustation scale.
Technical background
In ionic membrane method alkali-making process, high temperature alkaline solution cooling system is selected the plate type heat exchanger of commercial nickel material conventionally, owing to being followedRing water quality and the impact of operation process under hot conditions for a long time, nickel heat exchanger in use for some time, can be tied in recirculated water sideDirt. Because the thermal conductivity factor of dirt is less, be generally only 1% of carbon steel, according to related data statistics, in the time that schmutzband reaches 1mm, changeThe thermal efficiency reduces by 8%, thereby makes reduction of heat exchange efficiency, does not reach controlling of production process parameter, when serious, can be forced to stop production.
The cleaning method of nickel heat exchanger incrustation scale is mainly that artificial unloading cleans at present, as for plate type heat exchanger, need take board-like changing apartEach piece plate of hot device, adopts and manually each piece heat exchanger fin is carried out to cleaning and descaling, then re-assemblies. The shortcoming of this method isDevice needs the dismounting that stops production, and in when dismounting, sealing joint strip is fragile, also fragile heat exchange plate in the time cleaning, and renewal cost is high,The manual cleaning length that expends time in, labour intensity is large. And frequent dismounting to corrective maintenance, safeguard unfavorablely, greatly shortened equipmentService life. Taking 50,000 tons of ion film caustic soda factories of Panzhihua as example, electrowinning process goes out groove alkali lye heat exchanger, and plate material is technical pureNickel, this plate type heat exchanger often carries out artificial unloading's cleaning, while cleaning, must be equipped with at every turn pad and plate when removing damaged moreChange. When fouling is serious, more than 10 people clean need at least 1 time all day, at least needs to change several plates and 10 multiple pads.
For solving frequent manual cleaning problem, those skilled in the art need a kind of method of Chemical cleaning nickel heat exchanger. Due to nickelBe subject to the corrosion of strong oxidizing property inorganic acid, chemical cleaning method is less at present, has no up to now Patents and report.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of cleaning of simple to operate, the nickel heat exchanger incrustation scale that do not need disassembly, cleaningMethod.
For solving the problems of the technologies described above, the technical solution adopted in the present invention comprises the following steps:
A, alkali cleaning: add alkali wash water alkali cleaning, every 20min～60min measures phosphate concentration in alkali wash water, and alkali cleaning is to alkali wash waterMiddle phosphate concentration change≤0.1% or alkali wash water import and export phosphate concentration poor≤0.1%;
B, pickling: drain alkali wash water, add pickle pickling, every 20min～60min measures hydrogen ion concentration in pickle,Pickling to hydrogen ion concentration in pickle change≤0.1% or pickle import and export hydrogen ion concentration poor≤0.1%;
C, rinsing: drain pickle, add rinsing liquid rinsing;
D, passivation: drain rinsing liquid, add passivating solution passivation;
Wherein:
Described alkali wash water, in mass fraction, contains Na3PO40.5％～1％、Na2HPO40.1%～0.2% the aqueous solution;
Described pickle is in mass fraction, phosphoric acid 5%～10%, and sulfamic acid 8%～10%, surfactant 0.1%～0.3%, the aqueous solution of restrainer 0.25%～0.3%;
Described rinsing liquid, in mass fraction, containing citric acid 3%～5%, regulates the aqueous solution of pH value to 3～4 with ammoniacal liquor;
Described passivating solution, in mass fraction, contains NaNO20.25％～0.5％、Na3PO40.25％～0.5％、Na2CO30.5%～1% the aqueous solution.
Surfactant in described pickle can be selected sodium alkyl benzene sulfonate.
The Lan-826 multi-purpose type restrainer that described restrainer can select blue star group company to produce.
In technique scheme, for checking that heat exchanger has or not leakage, remove the dirt of surface porosity, reduce alkali wash water and pickleConsumption, can before alkali cleaning, first wash, be washed to without sewage and discharge. For accelerating washing speed, guarantee to wash effect,When washing, water flow velocity should control >=10m/s.
Alkali cleaning can be removed organic substance, loose hydrophobic substance and the sulfate of dirt layer outer surface that can make restrainer poison deactivationDirt, so that pickle can be had an effect with dirt layer, improves descale effect. Alkali cleaning can be carried out at normal temperatures, but the alkali cleaning timeLong, for accelerating alkali cleaning speed, save the alkali cleaning time, alkali cleaning temperature control is 70 DEG C～90 DEG C.
In above-mentioned arbitrary technical scheme, before pickling, can first wash to remove residual alkali wash water to save pickle consumption. ForAccelerate washing speed, when washing, water flow velocity should control >=10m/s.
Pickling can be carried out at normal temperatures, but pickling time is longer, and for saving pickling time, it is 40 DEG C～60 DEG C that pickling temperature should be controlled,Excess Temperature, the organic substance in restrainer, surfactant is easily destroyed, causes pickling Efficiency Decreasing.
In above-mentioned arbitrary technical scheme, before rinsing, can first wash to remove residual pickle to save rinsing liquid consumption. ForAccelerate washing speed, when washing, water flow velocity should control >=10m/s.
Rinsing can be carried out at normal temperatures, and for accelerating rinsing speed, it is 70 DEG C～90 DEG C that rinsing temperature should be controlled.
Rinsing time control is that 0.5h～1.5h can reach technological requirement, and concrete rinsing time is depending on rinsing temperature.
In rinsing liquid, regulate pH value ammonia concn used without particular/special requirement, adopt commercially available ammoniacal liquor.
In above-mentioned arbitrary technical scheme, in rinsing liquid, can add di-o-tolyl-thiourea 0.5%～1% as corrosion inhibiter.
Passivation can be carried out at normal temperatures, for guaranteeing passivation effect, saves passivation time, and it is 60 DEG C～90 DEG C that passivation temperature should be controlled.
Passivation time control is that 1h～6h can reach passivation effect, and concrete passivation time is depending on passivation temperature and passivation effect.
For guaranteeing cleaning performance, save and clean cost, pickle in technique scheme, alkali wash water, rinsing liquid, passivating solution,Water is all sent into from heat exchanger bottom, discharges from heat exchanger top; If wash, water is also sent into from heat exchanger bottom, from changingDischarge at hot device top.
For cost-saving, reduce wastewater discharge, pickle, alkali wash water, rinsing liquid, the passivating solution that discharge at heat exchanger top canRecycle; If wash, water also can be recycled.
Beneficial effect of the present invention is as follows:
Adopt technical solution of the present invention can effectively clean nickel heat exchanger recirculated water dirt, having avoided stopping production dismounting to bring simultaneouslyInconvenience and manpower, the consumption of materials. Meanwhile, technical solution of the present invention is simple, and cost is low, is suitable for promoting.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but not it should be understood that protection scope of the present invention is limitBe formed in this embodiment.
Taking 50,000 tons of scale ion film caustic soda factories of Panzhihua as example, it is nickel plate type heat exchanger that electrowinning process goes out groove alkali lye heat exchanger, plateSheet material is industrial pure ni, and fouling after use a period of time, cleans it.
Before cleaning, prepare: stop the use of this heat exchanger, close circulating water pipework and import and export main valve, open blowoff valve, by heat exchangeIn device, residual water drains; The sewage draining exit of importing and exporting in heat exchanger recirculated water side is connected to circulation cleaning device with flexible pipe;
Washing: toward topped up with water in circulation cleaning device, start circulation, will fill water in circulation cleaning device, observation wash cyclesIn device, liquid level has or not obvious reduction, checks and confirms to have the pipeline of cleaning to have or not interior leakage situation; Non-internal leakage drains sewage in circulating slot,Again till the circulation flushing that adds water is limpid to water;
Alkali cleaning: will be in mass fraction, containing Na3PO40.5％、Na2HPO40.15% the aqueous solution is sent into wash cycles, alkali cleaningTemperature is 70 DEG C～90 DEG C; Every 30 minutes monitoring phosphate concentration, until twice of front and back phosphate concentration measured value≤0.1% or alkali cleaningLiquid import and export phosphate concentration poor≤0.1%;
Washing: after alkali cleaning, water rinses and removes residual alkali lye, washing 0.5h;
Pickling: empty circulating slot, add the pickle preparing, start wash cycles, pickling temperature is 40 DEG C～60 DEG C; AcidWhile washing, every 30min measures hydrogen ion concentration, iron concentration, temperature and a pH value, to guarantee cleaning performance; When front and back twoInferior hydrogen ion determination value change≤0.1% or import and export hydrogen ion concentration poor≤0.1%, be considered as reaching clean endpoint; Wherein,Pickle is in mass fraction, phosphoric acid 8%, and sulfamic acid 10%, sodium alkyl benzene sulfonate 0.1, blue star group company producesThe aqueous solution of Lan-826 multi-purpose type restrainer 0.25%;
Washing: washing 0.5h removes pickle;
Rinsing: preparation rinsing liquid, rinsing liquid is in mass fraction, containing citric acid 3%, with adding after commercially available ammoniacal liquor adjusting pH value 3～4Enter di-o-tolyl-thiourea 0.5%. After adding rinsing liquid, open the circulation of nickel exchanger heat side alkali lye, indirect is warming up to rinsing liquid70 DEG C～90 DEG C, start circulating pump and carry out rinsing, rinsing time 1h;
Passivation; Drain rinsing liquid, add passivating solution, passivating solution, in mass fraction, contains NaNO20.25％、Na3PO40.25％、Na2CO31% the aqueous solution. Making passivation temperature by nickel exchanger heat side alkali lye indirect is 60 DEG C～90 DEG C, passivation time4h, completes cleaning.
After testing, the heat exchanger carbonate-type dirt descaling rate after cleaning all reaches more than 80%, silicate-type dirt and sulfateType dirt descaling rate all reaches more than 60%, and descale effect is obvious, has reached cleaning object. Metal lacing film corrosion rate averageValue≤10gm-2·h-1, scale removal post-passivation effect is good, has avoided manually unpicking and washing expending a large amount of human and material resources.
Claims (11)
1. the cleaning method of nickel heat exchanger incrustation scale, is characterized in that, comprises the following steps:
A, alkali cleaning: add alkali wash water alkali cleaning, every 20min～60min measures phosphate concentration in alkali wash water, and alkali cleaning is to alkali wash waterMiddle phosphate concentration change≤0.1% or alkali wash water import and export phosphate concentration poor≤0.1%;
B, pickling: drain alkali wash water, add pickle pickling, every 20min～60min measures hydrogen ion concentration in pickle,Pickling to hydrogen ion concentration in pickle change≤0.1% or pickle import and export hydrogen ion concentration poor≤0.1%;
C, rinsing: drain pickle, add rinsing liquid rinsing;
D, passivation: drain rinsing liquid, add passivating solution passivation;
Wherein:
Described alkali wash water, in mass fraction, contains Na3PO40.5％～1％、Na2HPO40.1%～0.2% the aqueous solution;
Described pickle is in mass fraction, phosphoric acid 5%～10%, and sulfamic acid 8%～10%, surfactant 0.1%～0.3%, the aqueous solution of restrainer 0.25%～0.3%;
Described rinsing liquid, in mass fraction, containing citric acid 3%～5%, regulates the aqueous solution of pH value to 3～4 with ammoniacal liquor;
Described passivating solution, in mass fraction, contains NaNO20.25％～0.5％、Na3PO40.25％～0.5％、Na2CO30.5%～1% the aqueous solution.
2. the cleaning method of nickel heat exchanger incrustation scale according to claim 1, is characterized in that: the surface in described pickleActivating agent is sodium alkyl benzene sulfonate.
3. the cleaning method of nickel heat exchanger incrustation scale according to claim 1, is characterized in that: described restrainer is for blueThe Lan-826 multi-purpose type restrainer that star group company produces.
4. the cleaning method of nickel heat exchanger incrustation scale according to claim 1, is characterized in that: in described rinsing liquid, contain two neighboursToluene thiocarbamide 0.5%～1%.
5. the cleaning method of nickel heat exchanger incrustation scale according to claim 1, is characterized in that, meets following at least one:
Alkali cleaning temperature is 70 DEG C～90 DEG C;
Pickling temperature is 40 DEG C～60 DEG C;
Rinsing temperature is 70 DEG C～90 DEG C;
Passivation temperature is 60 DEG C～90 DEG C.
6. the cleaning method of nickel heat exchanger incrustation scale according to claim 1, is characterized in that, meets following at least one:
Rinsing time 0.5h～1.5h;
Passivation time 1h～6h.
7. the cleaning method of nickel heat exchanger incrustation scale according to claim 5, is characterized in that, also meets following at least one:
Rinsing time 0.5h～1.5h;
Passivation time 1h～6h.
8. the cleaning method of nickel heat exchanger incrustation scale according to claim 1, is characterized in that, meets following at least one:
Before alkali cleaning, wash;
Before pickling, wash;
Before rinsing, wash.
9. the cleaning method of nickel heat exchanger incrustation scale according to claim 8, is characterized in that, meets following at least one:
Water flow velocity >=10m/s while washing before alkali cleaning;
Water flow velocity >=10m/s while washing before pickling;
Water flow velocity >=10m/s while washing before rinsing.
10. according to the cleaning method of the nickel heat exchanger incrustation scale described in claim 1～9 any one, it is characterized in that: pickle,Alkali wash water, rinsing liquid, passivating solution are all sent into from heat exchanger bottom, discharge from heat exchanger top; If wash, water is from changingHot device bottom is sent into, and discharges from heat exchanger top.
The cleaning method of 11. nickel heat exchanger incrustation scales according to claim 10, is characterized in that: discharge at heat exchanger topPickle, alkali wash water, rinsing liquid, passivating solution recycle; If wash, water circulation is used.
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| CN106032966A (en) * | 2015-03-18 | 2016-10-19 | 东莞新科技术研究开发有限公司 | Method for cleaning heat exchangers |
| CN106197139A (en) * | 2016-06-30 | 2016-12-07 | 华电能源股份有限公司佳木斯热电厂 | A kind of cleaning method for Thermal Corp's heat exchanger |
| CN105973061B (en) * | 2016-07-04 | 2018-08-14 | 大唐淮北发电厂 | A kind of descaling method of condenser of power plant |
| JP7042030B2 (en) * | 2017-03-14 | 2022-03-25 | アクアス株式会社 | How to clean the heat exchanger |
| CN108955344B (en) * | 2018-07-17 | 2020-09-25 | 江苏安泰安全技术有限公司 | Cleaning method of chemical tubular heat exchanger |
| CN109579608A (en) * | 2018-12-28 | 2019-04-05 | 杭州简弈科技有限公司 | A kind of the Fouling Cleaning equipment and its control method of tubular heat exchanger |
| RU2704169C1 (en) * | 2019-05-27 | 2019-10-24 | Общество с ограниченной ответственностью "Башкирская генерирующая компания" (ООО "БГК") | Method of cleaning and passivation of inner surface of pipes with successive action of chemical reagent and steam-oxygen mixture |
| CN110160392B (en) * | 2019-05-29 | 2021-04-02 | 佛山市海天（江苏）调味食品有限公司 | Online cleaning method for plate heat exchanger |
| RU2724063C1 (en) * | 2019-10-16 | 2020-06-19 | Общество с ограниченной ответственностью "Газпром добыча Ноябрьск" | Method of cleaning boiler equipment inner surfaces from deposits |
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| JPS6475894A (en) * | 1987-09-16 | 1989-03-22 | Koryu Kogyo Kk | Method of cleaning heat exchanger |
| CN101498004A (en) * | 2008-11-21 | 2009-08-05 | 宁夏电力科技教育工程院 | Chemical scrubbing method for boiler |
| CN101608882B (en) * | 2009-07-22 | 2010-12-01 | 瓮福（集团）有限责任公司 | Method for cleaning copper tubes of condenser |
| CN101614502B (en) * | 2009-07-22 | 2010-10-27 | 首钢京唐钢铁联合有限责任公司 | Cleaning method of low-temperature multiple-effect seawater desalination evaporator |
| CN102400167B (en) * | 2011-11-21 | 2013-04-17 | 河南中原黄金冶炼厂有限责任公司 | Chemical cleaning method for scales on tube of evaporator for producing ammonium sulfate |
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Effective date of registration: 20210806 Address after: 617063 Sichuan Panzhihua Panxi Bluestar Chemical Cleaning Co., Ltd Patentee after: Panzhihua Panxi Bluestar Chemical Cleaning Co.,Ltd. Address before: 617064 Panzhihua Steel Enterprise Xinyu Chemical Co., Ltd., Jinjiang vanadium and Titanium Industrial Park, Renhe District, Panzhihua City, Sichuan Province Patentee before: PANZHIHUA STEEL ENTERPRISES XINYU CHEMICAL Co.,Ltd. |
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