CN101871745A - Sulphuric acid plant liquid and liquid heat exchanger on-line cleaning method - Google Patents
Sulphuric acid plant liquid and liquid heat exchanger on-line cleaning method Download PDFInfo
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- CN101871745A CN101871745A CN 201010208281 CN201010208281A CN101871745A CN 101871745 A CN101871745 A CN 101871745A CN 201010208281 CN201010208281 CN 201010208281 CN 201010208281 A CN201010208281 A CN 201010208281A CN 101871745 A CN101871745 A CN 101871745A
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- heat exchanger
- descaling
- scale removal
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
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Abstract
The invention discloses a sulphuric acid plant liquid and liquid heat exchanger on-line cleaning method, which relates to the sulphuric acid production. The invention is characterized in that sulfamic acid, surface active agents and corrosion and scale inhibitors are selected as cleaning scale removing liquid according to ingredients of water side scale of a heat exchanger. A concrete recipe comprises 5 to 10 percent of sulfamic acid, 0.1 to 0.3 percent of surface active agents, 0.1 to 0.4 percent of corrosion inhibitors Lan-826 and the balance water. The method comprises the following steps: filling clean water in a scale removal preparation tank; placing the reagents into water to be prepared into scale removal cleaning liquid with the pH between 1.5 and 2.5; then, circularly injecting the scale removal liquid into the water side of the exchanger by a cleaning pump under the condition without a stop; and controlling the pH value of the cleaning scale removal liquid until a structure is cleanly cleaned. The sulfamic acid in the cleaning scale removal liquid is a high-grade product with the mass percent higher than or equal to 99.8 percent, the surface active agents are sodium n-alkylbenzenesulfonate, and the corrosion inhibitors (Lan-826) have major ingredients of organic nitrogenous compounds. The method of the invention has the advantages of easy acquisition of raw materials, simple and convenient operation and high scale removal efficiency, and is applicable to sulphuric acid production enterprises.
Description
Technical field
The present invention relates to sulfuric acid, furthermore relate to sulfuric acid production plant, specifically, relate to liquid, liquid heat exchanger in the sulfuric acid apparatus.
Background technology
Sulphuric acid process produces a large amount of reaction heat, need utilize heat exchanger to remove.Heat exchanger its water side in use for some time will fouling, thereby makes heat exchange efficiency reduce, and device capbility reduces, and device is forced to stop production when serious.The cleaning of sulfuric acid heat exchanger at present has following two kinds of methods:
(1) giant douche
For shell-and-tube heat exchanger, need take shell-and-tube heat exchanger water side apart, with giant each root heat exchanger tube is washed scale removal.The shortcoming of this method is that the device energy consumption that need stop production is big, and cleaning process water consumption is big, and cleans not thorough; For plate type heat exchanger, need take each piece plate of plate type heat exchanger apart, with giant each piece heat exchanger fin is washed scale removal.The shortcoming of this method is that the device energy consumption that need stop production is big, dismantles board-like heat exchanger type, and sealing joint strip is fragile, the renewal cost height, and cleaning process water consumption is big.
(2) mechanical removal method
For plate type heat exchanger, need take each piece plate of plate type heat exchanger apart, adopt and manually each piece heat exchanger fin is carried out cleaning and descaling.The shortcoming of this method is that the device energy consumption that need stop production is big, and sealing joint strip is fragile during dismounting, and the renewal cost height cleans fragile heat exchange plate.
The patent that relates to the scale removal of sulfuric acid apparatus heat exchanger at present only has 1, be ZL02113704 number " a kind of concentrating and impurity removing production method of dilute sulfuric acid ", this method dilute sulfuric acid direct with hot-air and through spray atomization carries out the counter current contacting heating evaporation and concentration in dry concentration tower, impurity in the acid of separating out in cooling, the separation concentrated vitriol and precipitating solves existing evaporation concentration equipment and has fouling of heat exchangers and the blockage problem that causes because of the impurity in the diluted acid.Up to now, still there is not the patent that relates to sulfuric acid apparatus heat exchanger descaling method.
Summary of the invention
The object of the present invention is to provide the method for a kind of sulfuric acid apparatus liquid, liquid heat exchanger on-line cleaning, to overcome the defective of prior art.
The inventor considers that original technology all belongs to the method for mechanical removal fouling, and this just might cause the damage of some part such as sealing strip, and the reset procedure effort is time-consuming, also must stop production, and is unfavorable for the long-term operation of process units.Therefore adopt chemical method to clean a kind of selection of can yet be regarded as.Under the situation that device does not stop production, select rational chemical agent for use, the incrustation scale on the heat exchanger is disposed, can reach desirable effect.
The method of the sulfuric acid apparatus liquid that the inventor provides, liquid heat exchanger on-line cleaning, it is composition according to the heat exchanger water side deposition, select for use sulfamic acid, surfactant, corrosion inhibiting and descaling agent as cleaning and descaling liquid, concrete prescription is: sulfamic acid 5%～10%, surfactant 0.1%～0.3%, corrosion inhibiter Lan-8260.1%～0.4%, Yu Weishui; Fill with clear water in the scale removal preparation vessel, above-mentioned medicament is put into water, be made into cleaning solution for descaling, pH is 1.5～2.5; Then, under the situation of not stopping, with scavenging pump heat exchanger water side is injected in the cleaning mixture circulation, the pH value of control cleaning and descaling liquid is till cleaning up structure.
Sulfamic acid (H in the above-mentioned cleaning and descaling formula of liquid
2NSO
2OH) product specification is the high-class product of mass fraction 〉=99.8%; Surfactant is sodium n-alkylbenzenesulfonate (LAS), is the commercial goods; Restrainer (Lan-826) is the commercial goods of nitrogen-containing organic compound for principal component.
PH value＜3.5 of above-mentioned cleaning and descaling hydraulic control system, control method are when cleaning mixture pH＞3.5, because cleaning mixture pH can progressively rise in cleaning, need to replenish that to add pH be 1.5～2.5 cleaning mixture.
The method of sulfuric acid apparatus liquid of the present invention, liquid heat exchanger on-line cleaning, have raw material be easy to get, easy and simple to handle, the advantage that scale removal efficient is high.Be applicable to gas washing in SA production enterprise.
The specific embodiment
2 * 400,000 tons of/year pyrite-based sulfuric acid production devices of sulfuric acid subsidiary factory of phosphate fertilizer plant of Co., Ltd of urn good fortune group use this law scale removal.Classify example as with monosystem:
Composition according to the heat exchanger water side deposition is: CaO 9.6%, MgO 2.8%, Fe
2O
32.7%, Al
2O
30.6%, phosphoric anhydride 3.5%, acid non-soluble substance 32.3%, burning decrement 48.5%; Select for use sulfamic acid, surfactant, corrosion inhibiting and descaling agent as cleaning and descaling liquid, concrete prescription is: the sulfamic acid 8% of mass fraction 〉=99.8%, sodium n-alkylbenzenesulfonate 0.2%, corrosion inhibiter Lan-826 0.3%, surplus is clear water.
Fill with clear water in the scale removal preparation vessel, above-mentioned medicament is put into water, be made into cleaning solution for descaling, its pH is 1.5～2.5.
Then, under the situation of not stopping, with scavenging pump heat exchanger water side is injected in cleaning mixture circulation, pH value＜3.5 of control cleaning and descaling liquid when cleaning mixture pH＞3.5, replenish adding pH and are 1.5～2.5 cleaning mixture, till structure is cleaned up.
Claims (3)
1. the method for a sulfuric acid apparatus liquid, liquid heat exchanger on-line cleaning, it is characterized in that it is a composition according to the heat exchanger water side deposition, select for use sulfamic acid, surfactant, corrosion inhibiting and descaling agent as cleaning and descaling liquid, concrete prescription is: sulfamic acid 5%～10%, surfactant 0.1%～0.3%, corrosion inhibiter Lan-826 0.1%～0.4%, Yu Weishui; Fill with clear water in the scale removal preparation vessel, above-mentioned medicament is put into water, be made into cleaning solution for descaling, pH is 1.5～2.5; Then, under the situation of not stopping, with scavenging pump heat exchanger water side is injected in the cleaning mixture circulation, the pH value of control cleaning and descaling liquid is till cleaning up structure.
2. the method for claim 1 is characterized in that the sulfamic acid (H in the described cleaning and descaling formula of liquid
2NSO
2OH) product specification is the high-class product of mass fraction 〉=99.8%; Surfactant is sodium n-alkylbenzenesulfonate (LAS), is the commercial goods; Restrainer (Lan-826) is the commercial goods of nitrogen-containing organic compound for principal component.
3. the method for claim 1 is characterized in that pH value＜3.5 of described cleaning and descaling hydraulic control system, control method are to replenish when cleaning mixture pH＞3.5 that to add pH be 1.5～2.5 cleaning mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102082811A CN101871745B (en) | 2010-06-24 | 2010-06-24 | Sulphuric acid plant liquid and liquid heat exchanger on-line cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102082811A CN101871745B (en) | 2010-06-24 | 2010-06-24 | Sulphuric acid plant liquid and liquid heat exchanger on-line cleaning method |
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| CN101871745A true CN101871745A (en) | 2010-10-27 |
| CN101871745B CN101871745B (en) | 2012-03-28 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353300A (en) * | 2011-08-18 | 2012-02-15 | 中国铝业股份有限公司 | Method for cleaning plate-type heat exchanger |
| CN102519301A (en) * | 2011-12-09 | 2012-06-27 | 贵州开磷（集团）有限责任公司 | Method for washing scales formed on tube of graphite heat exchanger |
| CN104089523A (en) * | 2014-06-26 | 2014-10-08 | 安徽淮化股份有限公司 | Method for cleaning surface scale on heat exchanger tube bundles online |
| CN104386836A (en) * | 2014-11-25 | 2015-03-04 | 苏州佑君环境科技有限公司 | Anti-scale agent applied to treatment of electroplating wastewater and preparation method of anti-scale agent |
| CN104860403A (en) * | 2015-04-28 | 2015-08-26 | 陕西凯利清洗有限公司 | Liquid medicine for online cleaning of air separation workshop appliances and application method thereof |
| CN108485828A (en) * | 2018-03-19 | 2018-09-04 | 仝建乐 | A kind of heat exchanger cleaning agent and preparation method thereof |
| CN110487108A (en) * | 2019-09-10 | 2019-11-22 | 南通能达水务有限公司 | A kind of compound cleaning method of tubular heat exchanger |
| CN110591829A (en) * | 2019-09-24 | 2019-12-20 | 华润电力（宜昌）有限公司 | Plate heat exchanger cleaning agent and preparation method thereof |
| CN111322904A (en) * | 2019-12-30 | 2020-06-23 | 甘肃银光化学工业集团有限公司 | Optimization method for heat exchanger pickling process |
| CN115228126A (en) * | 2022-07-19 | 2022-10-25 | 湖南余雄科技有限公司 | Continuous high-temperature crystallization process for sulfate |
| CN115488112A (en) * | 2022-08-03 | 2022-12-20 | 华能山东发电有限公司白杨河发电厂 | Online flushing method for water-hydrogen generator cooler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353300A (en) * | 2011-08-18 | 2012-02-15 | 中国铝业股份有限公司 | Method for cleaning plate-type heat exchanger |
| CN102519301A (en) * | 2011-12-09 | 2012-06-27 | 贵州开磷（集团）有限责任公司 | Method for washing scales formed on tube of graphite heat exchanger |
| CN104089523A (en) * | 2014-06-26 | 2014-10-08 | 安徽淮化股份有限公司 | Method for cleaning surface scale on heat exchanger tube bundles online |
| CN104386836A (en) * | 2014-11-25 | 2015-03-04 | 苏州佑君环境科技有限公司 | Anti-scale agent applied to treatment of electroplating wastewater and preparation method of anti-scale agent |
| CN104386836B (en) * | 2014-11-25 | 2016-04-13 | 刘昌华 | A kind of scale inhibitor for electroplating wastewater processing and preparation method thereof |
| CN104860403A (en) * | 2015-04-28 | 2015-08-26 | 陕西凯利清洗有限公司 | Liquid medicine for online cleaning of air separation workshop appliances and application method thereof |
| CN108485828A (en) * | 2018-03-19 | 2018-09-04 | 仝建乐 | A kind of heat exchanger cleaning agent and preparation method thereof |
| CN110487108A (en) * | 2019-09-10 | 2019-11-22 | 南通能达水务有限公司 | A kind of compound cleaning method of tubular heat exchanger |
| CN110591829A (en) * | 2019-09-24 | 2019-12-20 | 华润电力（宜昌）有限公司 | Plate heat exchanger cleaning agent and preparation method thereof |
| CN111322904A (en) * | 2019-12-30 | 2020-06-23 | 甘肃银光化学工业集团有限公司 | Optimization method for heat exchanger pickling process |
| CN115228126A (en) * | 2022-07-19 | 2022-10-25 | 湖南余雄科技有限公司 | Continuous high-temperature crystallization process for sulfate |
| CN115228126B (en) * | 2022-07-19 | 2024-03-19 | 湖南余雄科技有限公司 | Continuous high-temperature crystallization process for sulfate |
| CN115488112A (en) * | 2022-08-03 | 2022-12-20 | 华能山东发电有限公司白杨河发电厂 | Online flushing method for water-hydrogen generator cooler |
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Address after: 550500 Guizhou Province, Qiannan Buyei and Miao Autonomous Prefecture Fuquan Racecourse town Yingbin Road No. 1 Wengfu group Patentee after: WENGFU GROUP Co.,Ltd. Address before: 23, 550002 floor, urn Fuk international, No. 57, South City Road, Guizhou, Guiyang Patentee before: WENGFU GROUP Co.,Ltd. |
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