TWI593829B - Cleaning composition for water circulation system and method of cleaning surface using the same - Google Patents

Description

Cleaning composition of circulating water system and its use for cleaning Surface method

The present invention relates to a cleaning composition for a circulating water system and a method thereof for cleaning a surface, and more particularly to a cleaning composition for a circulating water system having a pH ranging from weakly acidic to weakly alkaline and used for the same The method of cleaning the surface.

The circulating water system includes a circulation line through which the circulating water can be continuously flowed and distributed in the circulating water system. In today's industries in various fields, circulating water systems are used for purposes such as cooling, heat exchange, water treatment or energy conversion.

In the case of a heat exchanger as a circulating water system, since the treated water obtained by removing the minerals or other impurities in the water by physical or chemical methods usually has a high temperature, it needs to be used before use. Treat the water to cool down. One of the commonly used means of cooling is to use the circulation line of the heat exchanger and the cooling water in the circulation line to cool the treated water. However, common heat exchangers (eg heat exchangers (such as Baltimore cold) However, the metal inner surface of the circulation line of the cooling tower of the system company) often has problems such as corrosion, scale formation and microbial growth. When the water quality of the cooling water contains ions that easily form scale, if the amount of the agent to prevent the formation of the scale is insufficient, the formation of the scale easily blocks the circulation line, the nozzle, etc. of the heat exchanger, and indirectly affects the amount of cooling water. The cooling efficiency of the heat exchanger is lowered. In addition, the open circulation pipeline is often exposed to sunlight, and the equipment easily grows moss, algae and microorganisms, and adheres to the fine suspended solids in the water, thereby forming a large amount of agglomerated biological slime and soft scale, plus the accumulation of scales. The effect further affects the cooling efficiency of the heat exchanger. Therefore, if the heat exchanger is overloaded and a large amount of cooling water is used, the above problems and unstable water quality may cause an unwarranted shutdown and economic loss.

The scale usually comprises calcium carbonate, magnesium carbonate, iron oxide, magnesium citrate, aluminum citrate (Al ₂ O ₃ /SiO ₂ ), triiron phosphate, ferrous sulfate, tricalcium phosphate and other insoluble materials, among which It is difficult to remove magnesium citrate, aluminum citrate and acid insoluble matter. Conventional fouling cleaning methods are performed by off-line manual cleaning, that is, the heat exchanger forming the scale is moved to a wide outdoor place, and is isolated and cleaned. The cleaning method is divided into the following types: (1) cleaning with a high-pressure water jet, but the cleaning effect is not good, and it takes time and labor; (2) Or, first use the high-pressure water jet to the metal inner surface of the heat exchanger The scale is removed, and then the cleaning agent (usually containing water, penetrant, stripper, accelerator, catalyst, ethylenediaminetetraacetic acid, surfactant and acid) is used for the second stage. Washing, wherein the above acidic substance can be, for example, hydrochloric acid, sulfuric acid, sulfamic acid or citric acid or the like. However, direct spraying of the cleaning agent still cannot effectively remove the scale inside the heat exchanger, so that the heat exchange efficiency after treatment is limited; (3) another method is to soak the heat exchanger to be cleaned with the inorganic acid ( For example: hydrochloric acid) and a cleaning inhibitor cleaning composition, and cleaning at a high temperature of about 50 ° C.

Further, all of the above methods require the heat exchanger to be shut down and then cleaned, so that the production line has to be stopped. In addition, although the above-mentioned inorganic acid-containing cleaning composition can easily dissolve and remove the scale containing calcium carbonate, the acidity (pH value is much less than 1.0) and corrosiveness of the inorganic acid (for example, hydrochloric acid) are strong. Local corrosion is likely to occur during cleaning, which increases the risk of pipe breaking in the circulating water system. In the event of a pipe break, the cooling water contaminates the treated water. In addition, since the inorganic acid has a strong reaction force, the fouling substance in the circulating pipe just contacted can be quickly removed when the cleaning composition is just added, but the corrosion efficiency of the inorganic acid is weakened with time. It will cause the scale exposed to the rear to be difficult to be removed, so there is a problem of uneven descaling. Furthermore, after the heat exchanger is washed with the hydrochloric acid solution, a large amount of washing water must be added for washing and neutralization, which not only wastes water resources but also has a large amount of sewage.

In addition, after cleaning with hydrochloric acid solution, since the material activity of the inner surface of the metal of the heat exchanger is very high, in order to avoid oxidation, a large amount of phosphate solution must be added immediately to form a film on the inner surface of the cleaned metal to prevent The inner surface of the metal is oxidized, but the phosphate agent used is expensive to handle. Another disadvantage is that the above-mentioned corrosion inhibitor added to protect the circulation line from being corroded by the inorganic acid increases the viscosity of the cleaning composition, making it difficult to take the cleaning composition, and adding the cooling of the cleaning composition described above. The viscosity of the water will also increase, which is not conducive to the flow of cooling water. In addition, during the cleaning with hydrochloric acid solution, the field operator is prone to inhalation problems, which will lead to Sore throat, cough and difficulty in breathing, as well as skin contact, causing severe irritation, causing redness and pain, corrosive injury and scarring. Once contact with the eyes, it may cause burns and even blindness. It has serious doubts about work safety and needs improvement. However, if the pH of the cleaning composition is increased to overcome the above problem of using hydrochloric acid, the cleaning effect is not good.

Therefore, it is urgent to propose a cleaning composition that can be used in the operation of a circulating water system (such as a heat exchanger). The pH of the cleaning composition is from weak acid to weak base to avoid corrosion of the circulating pipeline of the circulating water system or The tube is broken and the cleaning composition can have a lower viscosity for ease of access. In addition, the cleaning composition should have a good cleaning effect to further improve the processing efficiency of the circulating water system.

Accordingly, it is an aspect of the present invention to provide a cleaning composition having a weakly acidic to a weakly basic and a specific viscosity, and in the case of continuous operation of a circulating water system, in a circulation line of a circulating water system, The metal inner surface of the circulation line is cleaned.

Another aspect of the present invention provides a surface cleaning method which is mainly provided by a cleaning composition having a specific pH range and viscosity, and can be added to a circulation line of a circulating water system without external force to circulate The metal inner surface of the pipe is cleaned.

According to the above aspect, a cleaning composition is proposed. In one embodiment, the cleaning composition may comprise water (A), an organic acid salt of a fatty alcohol polyoxyethylene ether (B), an organic acid salt of an acrylate polymer (C), and a corrosion inhibitor. (D). The corrosion inhibitor (D) may be composed of an alkoxydecane compound and a phosphorus-containing benzotriazole compound. The organic acid salt (B) of the fatty alcohol polyoxyethylene ether may be used in an amount of 5 parts by weight to 20 parts by weight based on the water (A), and the organic acid salt of the acrylate polymer (C) The amount of the corrosion inhibitor (D) may be from 5 parts by weight to 15 parts by weight, and the cleaning composition may have a pH of from 6.5 to 8.5 and a viscosity of from 300 cps to 400 cps. .

According to an embodiment of the present invention, the fatty alcohol of the fatty acid polyoxyethylene ether organic acid salt (B) has a carbon number of at least 7, and the weight average molecular weight of the fatty acid polyoxyethylene ether organic acid salt (B) is It is 200 to 500.

According to an embodiment of the present invention, the organic acid salt (C) of the acrylate polymer may have a weight average molecular weight of 3,000 to 5,000.

According to an embodiment of the present invention, the weight ratio of the alkoxydecane to the phosphorus-containing benzotriazole may be from 1.0 to 1.2.

According to an embodiment of the present invention, the organic acid salt (B) of the fatty alcohol polyoxyethylene ether may be used in an amount of 5 parts by weight to 15 parts by weight based on 100 parts by weight of the water (A), and the acrylate is polymerized. The organic acid salt (C) may be used in an amount of from 90 parts by weight to 110 parts by weight, and the corrosion inhibitor (D) may be used in an amount of from 8 parts by weight to 15 parts by weight.

According to an embodiment of the present invention, the organic acid salt (B) of the fatty alcohol polyoxyethylene ether may be used in an amount of 10 parts by weight to 15 parts by weight based on 100 parts by weight of the water (A), and the acrylate is polymerized. The organic acid salt (C) may be used in an amount of from 100 parts by weight to 110 parts by weight, and the corrosion inhibitor (D) may be used in an amount of from 8 parts by weight to 10 parts by weight.

According to the above aspect of the invention, a surface cleaning method is proposed. In an embodiment, a circulating water system is first provided. The circulating water system includes a circulation line, a first valve, and a second valve. The circulation line is provided with a circulating water inlet, a circulating water outlet and a pumping pump, and the circulation line has a metal inner surface. The first valve is disposed on the circulating water inlet and the second valve is disposed on the circulating water outlet. The circulating water system circulates in the circulation line and contacts the inner surface of the metal, or enters and exits the circulating water system via the circulating water inlet and the circulating water outlet. Next, a cleaning composition is provided, wherein the cleaning composition may comprise water (A), an organic acid salt of a fatty alcohol polyoxyethylene ether (B), an organic acid salt of an acrylate polymer (C), and a corrosion inhibitor (D). ). The corrosion inhibitor (D) may be composed of an alkoxydecane compound and a phosphorus-containing benzotriazole compound. The organic acid salt (B) of the fatty alcohol polyoxyethylene ether may be used in an amount of 5 parts by weight to 20 parts by weight based on the water (A), and the organic acid salt of the acrylate polymer (C) The amount may be from 85 parts by weight to 120 parts by weight, the corrosion inhibitor (D) may be used in an amount of from 5 parts by weight to 15 parts by weight, and the cleaning composition has a pH of from 6.5 to 8.5 and a viscosity of from 300 cps to 400 cps. Next, the cleaning composition was added to the circulating water of the circulating water system at an addition rate of 7 liters/day to 10 liters/day.

According to an embodiment of the present invention, the fatty alcohol of the fatty acid polyoxyethylene ether organic acid salt (B) has a carbon number of at least 7, and the weight average molecular weight of the fatty acid polyoxyethylene ether organic acid salt (B) is It is 200 to 500.

According to an embodiment of the present invention, the organic acid salt (C) of the acrylate polymer may have a weight average molecular weight of 3,000 to 5,000.

According to one embodiment of the invention, alkoxy decane and phosphorus The weight ratio of benzotriazole may range from 1.0 to 1.2.

By using the cleaning composition of the present invention and the method of using the same, the scale can be simultaneously removed during operation of the circulating water system. In addition, the pH of the cleaning composition of the present invention is between 6.5 and 8.5, so that the scale can be effectively removed without damaging the circulation line of the circulating water system, thereby improving the treatment efficiency of the circulating water system. Furthermore, the cleaning composition of the present invention has a specific viscosity, so that it can be added to the circulating water of the circulating water system by means of gravity addition, without additionally adding a motor for extracting the cleaning composition, and adding circulating water after cleaning the composition. It can still maintain the viscosity close to water, which is conducive to the flow of circulating water in the circulating water system, so it can also achieve energy saving effect.

100‧‧‧ heat exchanger

110‧‧‧Dosing bucket

111‧‧‧ cleaning composition

120‧‧‧Cooling trough

121‧‧‧Cooling water

123‧‧‧Cooling water inlet

125‧‧‧Cooling water outlet

130‧‧‧ pumping pump

140‧‧‧Cooling water pipes

141‧‧‧Watering system

150‧‧‧ wave board

160‧‧‧Processing sink

161‧‧‧Processing water inlet

163‧‧‧Processing water outlet

170‧‧‧ cooling fan

180‧‧‧First valve

190‧‧‧Second valve

200‧‧‧Floating device

210‧‧‧Hydration system

211‧‧‧Connected pipe

213‧‧‧Hydration pump

Arrow ‧ ‧ water flow direction

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Fig. 1 is a schematic view showing a heat exchanger used in a method of using a cleaning composition according to an embodiment of the present invention.

Cleaning composition

It is an object of the present invention to provide a cleaning composition for a circulating water system and a surface cleaning method. The cleaning composition comprises water (A), an organic acid salt (B) of a fatty alcohol polyoxyethylene ether, an organic acid salt (C) of an acrylate polymer, and a corrosion inhibitor (D) having a weakly acidic to weak base. Sex and viscosity from 300 cps to 400 cps. Therefore, the cleaning composition can be When added to the circulating water, the scale formed on the inner surface of the metal of the circulation line can be uniformly washed without damaging the circulation line under the condition that the circulating water system is continuously operated. Further, the cleaning composition of the present invention can overcome the disadvantages of conventionally causing the circulating water to be broken due to pickling, and polluting the circulating water to treat the water. Furthermore, the cleaning composition of the present invention has a specific viscosity and can be added to the circulating water of the circulating water system by means of non-external force intervention, and the circulating water is kept close to the viscosity of the water, which facilitates the flow of the circulating water in the circulating water system. Therefore, energy saving effects can be achieved. The respective components in the cleaning composition of the present invention will be separately described below.

The present invention is referred to herein as weakly acidic to weakly basic, and generally refers to pH 6.5 to pH 8.5. If the pH of the cleaning composition is below 6.5, the metal inner surface of the circulation line is corroded by the acid cleaning composition. If the pH of the cleaning composition is more than 8.5, the cleaning effect on the scale formed on the inner surface of the metal of the circulation line is not good.

The viscosity of the present invention referred to herein as water generally means 4 cps to 6 cps at normal temperature (for example, at 25 ° C). If the viscosity of the above cleaning composition is greater than 400 cps, the cleaning composition cannot be added to the circulating water by means of non-external force intervention, and the viscosity of the circulating water in the circulating water system is increased (greater than 6 cps), which is not conducive to circulating water circulation. The flow in the water system, in turn, increases the cost of additional equipment for the extraction of the cleaning composition.

The method of non-external force intervention referred to in the present invention may be, for example, a method of adding gravity, that is, using a difference in position, the cleaning composition is added to the circulating water in the direction of gravity.

The organic acid salts referred to herein as including, but not limited to, carboxylates (-COOH), sulfonates (-SO ₃ H), sulfinates (-SO ₂ HR), sulfur carboxylates (-COSH) )Wait.

The circulating water system referred to herein as the present invention may include any device known in the art to circulate water in a pipeline to achieve a particular effect. In one example, the circulating water system described above can be, for example, a heat exchanger.

The term "circulating line" as used herein refers to the various components through which circulating water flows, and the inner surface of the metal refers to the surface of the various components in contact with the circulating water.

Water (A)

The cleaning composition of the present invention contains water (A), and the water herein is not particularly limited, and for example, pure water, deionized water, tap water, distilled water, electrolyzed water or reverse osmosis water or the like can be used. Preferably, to avoid the use of the cleaning composition, ions in the water provide a source of scale formation, and the water (A) used herein to clean the composition may, for example, be deionized water.

The water (A) is mainly formed by uniformly dispersing an organic acid salt (B) of a fatty alcohol polyoxyethylene ether described later, an organic acid salt (C) of an acrylate polymer, and a corrosion inhibitor (D) to form a uniform The cleaning composition of the present invention.

Fatty alcohol polyoxyethylene ether organic acid salt (B)

The cleaning composition of the present invention comprises an organic acid salt (B) of a fatty alcohol polyoxyethylene ether. In one embodiment, the fatty acid polyoxyethylene ether organic acid salt (B) may have a weight average molecular weight of 200 to 500. In one example, the fatty alcohol in the fatty acid polyoxyethylene ether organic acid salt (B) has a carbon number of at least 7.

The organic acid salt (B) of the above fatty alcohol polyoxyethylene ether can be exemplified Such as isomeric tridecanol polyoxyethylene ether sulfonate sodium salt, isomeric tridecanol polyoxyethylene ether-3 carboxylate sodium, isomeric tridecanol polyoxyethylene ether-4 carboxylate, isomeric thirteen Alcohol polyoxyethylene ether-7 carboxylate, isomeric tridecyl polyoxyethylene ether-8 carboxylate, isomeric tridecyl polyoxyethylene ether-12 carboxylate, fatty alcohol polyoxyethylene ether sulfoaluminum Acid disodium salt, isomeric undecyl alcohol polyoxyethylene ether sulfonate sodium salt, isomeric deca alcohol polyoxyethylene ether sulfonate sodium salt, isomeric heptaol polyoxyethylene ether sulfonate sodium salt, lauryl alcohol polyoxyethylene a mixture of one or more of the sodium ether sulfates. Specifically, as the organic acid salt (B) of the fatty alcohol polyoxyethylene ether, a product of the model E-TJ51 manufactured by Zhongyu Environmental Engineering Co., Ltd. can be used.

The organic acid salt (B) of the fatty alcohol polyoxyethylene ether is used in an amount of 5 parts by weight to 20 parts by weight, preferably 5 parts by weight to 15 parts by weight, based on 100 parts by weight of the water (A). It is more preferably from 10 parts by weight to 15 parts by weight.

The organic acid salt (B) of the fatty alcohol polyoxyethylene ether referred to in the present invention is used as a penetrating agent, and its main function is to soften the scale in the circulation pipeline and increase the porosity of the scale to facilitate the later description. The organic acid salt (C) of the acrylate polymer further disperses the scale to achieve the cleaning effect. In particular, the present invention replaces the conventionally used inorganic acid with an organic acid salt (B) of a fatty alcohol polyoxyethylene ether, which can effectively alleviate the disadvantage of corroding the circulation line by using a mineral acid. Therefore, the present invention is Exclude the use of inorganic acids.

If the molecular weight of the organic acid salt (B) of the above fatty alcohol polyoxyethylene ether is more than 500 or the amount thereof is more than 20 parts by weight, the molecule of the fatty acid polyoxyethylene ether organic acid salt (B) is easily wound and aggregated. Therefore, it is not conducive to softening the scale. If the above fatty alcohol polyoxyethylene ether (B) has a molecular weight of less than 200 or its use amount of less than 5 parts by weight, the effect of softening the scale is not good, thereby affecting the efficiency of cleaning.

Organic acid salt of acrylate polymer (C)

The cleaning composition of the present invention comprises an organic acid salt (C) of an acrylate polymer. In one embodiment, the organic acid salt (C) of the acrylate polymer may have a weight average molecular weight of 3,000 to 5,000.

The organic acid salt (C) of the above acrylate polymer may, for example, be a polystyrene sulfonate acrylate copolymer, a sulfonic acid polymethacrylate copolymer, a tetradecyl carboxylate-sulfonate-acrylate ternary Copolymer, acrylic acid-acrylate-sulfonate terpolymer. Specifically, the organic acid salt (C) of the acrylate polymer can be a product of the model E-TJ52 manufactured by Zhongyu Environmental Engineering Co., Ltd.

The organic acid salt (C) of the acrylate polymer is used in an amount of from 85 parts by weight to 120 parts by weight, preferably from 90 parts by weight to 110 parts by weight, based on 100 parts by weight of the water (A). More preferably, from 100 parts by weight to 110 parts by weight.

The organic acid salt (C) of the acrylate polymer referred to herein is used as a dispersing agent, and its main function is after softening the scale of the organic acid salt (B) of the fatty alcohol polyoxyethylene ether as described above. The gap between the scales is inserted, and the scale is dispersed to achieve the cleaning effect. Therefore, if the above weight average molecular weight is more than 5,000, the organic acid salt (C) of the acrylate polymer may be difficult to achieve the effect of dispersing the scale because the volume is larger than the void. Further, if the weight average molecular weight of the organic acid salt (C) of the acrylate polymer is less than 3,000, the dispersion effect on the scale is inferior.

Corrosion inhibitor (D)

The cleaning composition of the present invention includes a corrosion inhibitor (D). The corrosion inhibitor (D) is composed of an alkoxydecane compound and a phosphorus-containing benzotriazole compound.

In one embodiment, the alkoxydecane compound can be, for example, methyltrimethoxydecane, methyltriethoxydecane, ethyltrimethoxydecane, ethyltriethoxydecane, isopropyltrimethoxy. Decane, isopropyltriethoxydecane, n-butyltrimethoxydecane, isobutyltrimethoxydecane, phenyltrimethoxydecane,phenyltriethoxydecane, n-phenylaminopropyltrimethoxy Baseline, 3-(meth)acryloxypropyltriethoxydecane, 3-aminopropyltriethoxydecane, 3-mercaptopropyltrimethoxydecane, polydiethoxydecane, and fluorine Propyltriethoxydecane polydimethylsiloxane. Specifically, as the alkoxydecane compound, a product of the model E-TJ53 manufactured by Zhongyu Environmental Engineering Co., Ltd. can be used.

In another embodiment, the phosphorus-containing benzotriazole compound can be, for example, benzotriazole-N,N,N',N'-tetramethyluronium hexafluorophosphate, 1H-benzotriazole- 1-yloxytripyrrolidinyl hexafluorophosphate, azabenzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate, 6-chlorobenzotriazole-1,1 , 3,3-tetramethylurea hexafluorophosphate or any combination of the above. Specifically, the phosphorus-containing benzotriazole compound may be a product of the model E-TJ54 manufactured by Zhongyu Environmental Engineering Co., Ltd.

The corrosion inhibitor (D) is used in an amount of 5 parts by weight to 15 parts by weight, preferably 8 parts by weight to 15 parts by weight, based on 100 parts by weight of the above water (A), and 8 parts by weight to 10 parts by weight. The parts by weight are more preferred. Corrosion inhibitor In (D), the weight ratio of the alkoxydecane compound to the phosphorus-containing benzotriazole compound is from 1.0 to 1.2. If the weight ratio of the above two is low, it means that the anti-corrosion effect is not good, and the circulating pipe after cleaning has the disadvantage of obvious corrosion.

The corrosion inhibitor (D) referred to herein as the invention can reduce the corrosion of the cleaning composition on the circulation pipeline, and form a film on the inner surface of the metal of the circulation pipeline while removing the scale, thereby blocking the circulation. The metal inner surface of the pipeline is in contact with the cleaning composition, thereby effectively preventing the continuous corrosion of the cleaning composition to the circulation pipeline. Further, the phosphorus-containing benzotriazole compound in the corrosion inhibitor (D) forms a protective film of iron phosphate with iron on the inner surface of the metal of the circulation line. That is to say, the cleaning composition of the present invention does not require additional addition of phosphate after the cleaning for film protection, so that the disadvantage that the large amount of the phosphate solution produced by the conventional cleaning method is not easy to handle can be improved.

If the amount of the corrosion inhibitor (D) used is less than 5 parts by weight, the corrosion of the circulation line cannot be effectively alleviated. If the amount of the corrosion inhibitor (D) is more than 15 parts by weight, the viscosity of the cleaning composition is increased, and it cannot be added to the circulating water of the circulating water system by means of non-external force in the subsequent surface cleaning method, thereby increasing The power consumption of the extraction motor is installed.

Method for manufacturing cleaning composition

The cleaning composition of the present invention is such as the above-mentioned parts by weight of water (A), an organic acid salt of a fatty alcohol polyoxyethylene ether (B), an organic acid salt (C) of an acrylate polymer, and a corrosion inhibitor (D). After thoroughly mixing, the amount of water (A) used in the cleaning composition is 100 parts by weight, the organic acid salt of the fatty alcohol polyoxyethylene ether (B), the organic acid salt of the acrylate polymer The total amount of use of (C) and the corrosion inhibitor (D) is preferably from 119 parts by weight to 152 parts by weight.

Surface cleaning method

The cleaning composition of the present invention can be applied to the inner surface of the metal of the circulation line of the cleaning circulating water system. When the cleaning composition of the present invention is added to the circulating water of the circulating water system, the washing step can be performed during the operation of the circulating water system. In one example, the circulating water system described above is a heat exchanger, and the circulating water is also referred to as cooling water. Hereinafter, a method of cleaning the surface of the present invention will be described by taking the heat exchanger 100 shown in Fig. 1 as an example. However, the heat exchangers shown are only schematic diagrams, so only the basic components required for the surface cleaning method are shown. Those skilled in the art should be able to understand the actual components of the actual heat exchanger and the components. The connection method and its function.

As shown in FIG. 1 , the heat exchanger 100 includes a medicating bucket 110 , a cooling water tank 120 , a pumping pump 130 , a cooling water pipe 140 , a wave board 150 , a processing water tank 160 , a cooling fan 170 , a first valve 180 , a second valve 190 , and Floating debris removal device 200. The circulation line referred to throughout the present invention includes various components through which circulating water flows (e.g., cooling water tank 120, cooling water pipe 140, wave plate 150, etc.), and scale is easily formed in the above-mentioned circulation line.

The cleaning composition 111 is placed in the medicated tub 110. The cooling water 121 is housed in the cooling water tank 120. The cooling water pipe 140 further includes a water spray system 141 that sprays cooling water onto the treatment water tank 160 via a nozzle (not shown). The wave plate 150 and the cooling fan 170 are used to help the heat exchanger 100 dissipate heat. The treatment tank 160 is for accommodating the treated water to be cooled, and the treated water The tank 160 further includes a treated water inlet 161 to be cooled, and a water outlet 163 for outputting the cooled treated water (the arrow is the direction of the water flow of the treated water). The first valve 180 is disposed on the cooling water inlet 123 of the cooling water tank 120, and the cooling water inlet 123 is used to add the cooling water 121 to the cooling water tank 120. The second valve 190 is disposed on the cooling water outlet 125 of the cooling water tank 120, and the cooling water outlet 125 is configured to discharge the cooling water 121 from the cooling water tank 120. The cooling water inlet 123 and the cooling water outlet 125 are preferably disposed on opposite sides of the cooling water tank 120. The float removal device 200 is used to remove droplets or suspended matter produced during the cooling or cleaning steps.

In one embodiment, the surface cleaning method of the present invention first comprises providing a cleaning composition as described above. The details, composition, properties and usage of the cleaning composition are clearly described in the foregoing, and therefore will not be further described herein. As shown in FIG. 1, the dosing tank 110 is placed above the cooling water tank 120 of the heat exchanger 100, and the cleaning composition 111 is added to the cooling water tank 120 by means of gravity addition.

Next, the cleaning composition 111 is added to the cooling water tank 120 of the heat exchanger 100 at an addition rate of 7 liters/day to 10 liters/day, and mixed with the cooling water 121 in the cooling water tank 120. The above-mentioned addition method is performed by means of non-external force intervention, for example, gravity addition. That is, the cleaning composition 111 accommodated in the above-described dosing tank 110 can flow into the cooling water tank 120 of the heat exchanger 100 by gravity, so that the heat exchanger 100 can omit the means for extracting the cleaning composition 111.

It should be particularly noted that the cleaning composition of the present invention can be added by means of gravity addition, because of the cleaning composition of the present invention. 111 controls its pH to be between 6.5 and 8.5, and has a specific viscosity, so that the cleaning composition 111 can be added to the cooling water 121 only by gravity without additional extraction force during operation of the circulating water system. Further, the circulating water to which the cleaning composition of the present invention is added can maintain a viscosity close to that of water, thereby facilitating the flow of circulating water in the circulating water system.

Thereafter, the cooling water 121 containing the cleaning composition 111 is extracted by the pumping pump 130, so that the cooling water 121 and the cleaning composition 111 flow in the circulation line, and contact the metal inner surface of the circulation line where the scale is formed. To perform simultaneous heat exchange and washing steps.

In this example, the cleaning composition of the present invention is used to clean the circulation line when the heat exchanger 100 is in operation, so that the operating temperature of the cleaning composition of the present invention can be regarded as the cooling water with the circulation line in the heat exchanger 100. The temperature is the same. In one example, the cleaning composition can be applied at a temperature of from 25 °C to 30 °C. Furthermore, the cleaning composition of the present invention is continuously added, and the cooling water is circulated in the circulation line, so that the scale in the circulation line can be uniformly removed.

In detail, the cleaning composition 111 is extracted by the pumping pump 130, flows through the cooling water pipe 140, and then sprayed through the water spraying system 141, and then returned to the cooling water tank 120 through the wave plate 150 for heat dissipation, so that the cleaning composition 111 can flow through The circulation line of the heat exchanger 100 (including the cooling water tank 120, the cooling water pipe 140, the wave plate 150, and the floating material removing device 200) and contacts the inner surface of the metal to remove the scale formed on the inner surface of the metal of the circulation line .

In an exemplary embodiment, the pumping pump 130 may further include an overflow hole that prevents the pumping pump 130 from drawing air during operation (not drawn) Show), or make the level of the cooling water higher than the pumping pump 130 up to 10 cm to 20 cm, can also prevent the pump from pumping air. The setting of the overflow hole should be easily understood by those having ordinary knowledge in the art, and therefore will not be further described herein.

In an exemplary embodiment, the heat exchanger 100 further includes a water supply system 210 including a communication pipe 211 and a water supply pump 213 disposed on the communication pipe 211. The two ends of the communication pipe 211 are respectively connected to the cooling water inlet 123. The water source (not shown) is connected to extract new cooling water using the hydrating pump 213, and passes through the cooling water inlet 123 to the cooling water tank 120. The above surface cleaning method may further comprise the step of adding the cleaning composition and the step of pumping the cooling water containing the cleaning composition, supplementing the evaporation water or the cooling water lost by other means (opening the first valve 180) ), or the cooling water used for a period of time (opening the first valve 180 and the second valve 190) may be replaced to increase the efficiency of the cleaning composition.

In general, the time required for cleaning is based on the scale formation of the heat exchanger. In one example, the time required for cleaning is approximately four weeks. As described above, the cooling water 121 in the heat exchanger 100 can be replaced during the cleaning according to the use of the site to maintain the cleaning performance of the cleaning composition. For example, the cooling water can be replaced once a week to two weeks.

Next, the cleaning compositions of the present invention and the manner of use thereof will be described in conjunction with a number of examples. However, while the following examples are cleaned with a particular composition and amount of cleaning composition, with a particular rate of addition and amount of water, it will be appreciated by those of ordinary skill in the art that the values presented are merely to simplify the invention. It is intended to be illustrative, and not to limit the scope of the invention. Therefore, it can be simply retouched or replaced without departing from the spirit and scope of the present invention. To a similar effect.

Example 1

Example 1 is an evaluation of the cleaning efficacy of the cleaning composition in the heat exchanger 100 of Figure 1 above. 10 parts by weight of an organic acid salt (B-1) of a fatty alcohol polyoxyethylene ether, 100 parts by weight of an organic acid salt (C-1) of an acrylate polymer, and 9 parts by weight of a corrosion inhibitor (alkoxy group) The weight ratio of decane (D-1-1) to phosphorus-containing benzotriazole (D-2-1) is 1) mixed into 100 parts by weight of deionized water to form the cleaning composition of Example 1, which The viscosity is 350 cps. The above cleaning composition was placed in a medicated bucket and added to a cooling water tank of a heat exchanger at a rate of addition of 7.14 liters/day, and the viscosity of the cooling water containing the cleaning composition was 4 cps to 6 cps. The cooling water in the cooling water tank and the cleaning composition are pumped by the pumping pump and continuously cycled for four weeks to complete the cleaning. During the cleaning, the steps of replacing the cooling water are performed at the beginning of the second and fourth weeks, respectively. The pump used handles 200 tons of water per hour and has a horsepower of 4.5 HP. The amount of cooling water used after four weeks of circulation was 328 tons, and 10 cubic meters of water was retained in the cooling water tank, and the total amount of cleaning composition added was 200 kg. Among them, the composition of the scale of the heat exchanger was analyzed by an X-ray fluorescence analyzer (X-Ray Fluorescence; XRF; Brooke; S8 Tiger), which is shown in Table 2 below. The evaluation methods and results of Example 1 are detailed in Table 1.

Examples 2 to 3

Examples 2 to 3 were prepared in the same manner as in Example 1, except that Examples 2 to 3 changed the components of the cleaning composition. The types and/or usages are detailed in Table 1 below and will not be described here. Further, Examples 2 to 3 were respectively added to heat exchangers different from those of the heat exchanger of Example 1, wherein the composition of the scale of each heat exchanger is as shown in Table 2 below, and is not described here. The evaluation methods and results of Examples 2 to 3 are detailed in Table 1.

Evaluation method

1. The scale thickness of the circulating pipeline

The scale of the scale of the circulation line referred to in the present invention means after four weeks of cleaning (that is, the cleaning composition of the present invention is circulated in the heat exchanger for four weeks), and is carried out with a micro ruler. The thickness of the scale is measured, and the difference in thickness between before and after cleaning is compared. The greater the difference in thickness, the better the cleaning effect.

2. Wave suction speed

The wave suction speed referred to herein as the present invention represents the operating efficiency of the wave board. Comparing the cleaning speed of the wave before cleaning with the cleaning, if the suction speed is faster, the operating efficiency of the wave plate is higher, which means that the cleaning effect is better.

3. Treat the temperature difference between the water inlet and the water outlet

The temperature difference between the water inlet and the water outlet of the treated water referred to herein as the present invention can be used to evaluate the merits of the cleaning effect. The original factory-set temperature difference of the heat exchanger should be 10 ° C, but with the formation of fouling, the temperature difference is gradually reduced. If the temperature difference is less than 4 ° C, the cooling efficiency of the heat exchanger is not good. because Therefore, if the temperature difference between the cleaning and the cleaning before the increase is increased, the cleaning effect is good.

4. Operating current of the cooling fan

The operating current of the cooling fan referred to herein as the present invention can also be used to evaluate the advantages and disadvantages of the cleaning effect. When the cleaning effect is good, since the heat dissipation effect of the heat exchanger is increased, the operating current of the heat dissipation fan can be made small. Therefore, if the operating current after washing is less than that before washing, the cleaning effect is good.

In addition, in Table 1, there are "efficiency" fields under the above four evaluation results, and the efficiency is calculated according to the calculation method of the following formula (I), which represents the ratio of the improved performance before and after the cleaning.

Efficiency = | (value before cleaning) - (value after cleaning) | / (value before cleaning) * 100% (I)

5. Calcium content of cooling water

The calcium content of the cooling water referred to herein is a measure of the amount of calcium ions contained in the cooling water before and after washing. Since the scale contains calcium ions, if the calcium ion content of the cooling water after washing is greater than the calcium ion content of the cooling water before washing, the cleaning effect of the cleaning composition can be regarded as good. In particular, the calcium content of the cooling water referred to herein is sampled and detected during the first week, the second week, and the fourth week during the four weeks of cleaning. The detailed data and results are detailed. Listed in Table 3, wherein the data of Table 3 is the detection target according to Example 3 of the present invention.

6. Corrosion rate

The corrosion rate referred to herein is based on a standard carbon steel material (containing 99.18 to 99.62 wt.% of iron, 0.08 to 0.13 wt.% of carbon, and 0.3 to 0.6 wt.% of manganese) in a cooling water tank of a heat exchanger. a test piece of less than 0.05 wt.% of sulfur and less than 0.04 wt.% of phosphorus, the corrosion of the test piece is calculated after the test piece is immersed in the cooling water containing the cleaning composition of the present invention for a predetermined period of time during the cleaning. To the extent that the general gauge corrosion rate is less than 5 mils per year (mpy). The degree of corrosion of the test piece is calculated according to the formula of the following formula (II): corrosion rate = [K × (weight loss (g))] / metal density × surface area of the test piece × cleaning time (days)] (II)

Wherein, in the embodiment of the present invention, K is a coefficient of unit conversion and is 5.34×10 ⁵ , and the weight loss is the weight of the unimmersed test piece (the initial weight) minus the weight of the test piece after the immersion (the final weight), and the metal density is 7.86 g / cm ^ 3, the test piece surface area is 3.38 square feet. Table 4 is a detailed description of the values required for calculating the corrosion rate in the third embodiment of the present invention, and the calculation methods of the embodiments 1 to 2 are as in the third embodiment, so the present invention will not be further described.

First, please refer to Table 2, which details the composition of the scale in each of the heat exchangers of Examples 1 to 3. According to Table 2, the main components of the scales of Examples 1 and 2 were calcium carbonate, magnesium citrate, iron oxide, and magnesium carbonate. On the other hand, the main components of the scale of the embodiment 3 are calcium carbonate, magnesium niobate, aluminum niobate, triiron phosphate, ferrous sulfate, tricalcium phosphate and other acid insolubles, among which other acid insolubles are composed. The ratio was higher than 30% by weight, indicating that the scale of Example 3 was more difficult to remove than the scales of Examples 1 and 2.

According to Table 1, Examples 1 to 3 using the cleaning composition of the present invention can reduce the thickness of the scale by at least 81%, increase the suction speed of the waveboard by at least 63%, and increase the inlet and outlet of at least 36%. The temperature difference can increase the running current of the cooling fan by at least 4.7%, and the corrosion rate can be controlled to be less than 5 mpy, so the cleaning compositions have good cleaning effects. In particular, according to the results of Example 3, the cleaning composition of the present invention has a good cleaning effect on magnesium silicate, aluminum silicate and acid insoluble which are difficult to remove. Further, the cleaning composition of the present invention is less corrosive to the cooling water system, so that the cleaning can be simultaneously performed during the operation of the heat exchanger, and the corrosion-free tube causes the treated water to be contaminated.

Next, please refer to Table 3, which details the change in the calcium content of the cooling water after the cleaning composition of Example 3 of the present invention is used. The measurements were made on the first, second and fourth weeks of the cleaning, respectively. It is known from the calcium ion content that the cleaning composition of the present invention can be effectively cleaned (the calcium ion content after washing is higher than before washing). In particular, the second week is not completely replaced with cooling water as new cooling water, so the measured calcium ion content before washing is higher, however, from the results of the second week, the present invention is also known. The cleaning composition still has the ability to clean the scale after one week of use.

In summary, by applying the cleaning composition of the present invention and the method of using the same, the scale generated on the inner surface of the metal of the circulation line can be simultaneously removed during operation of the circulating water system. Further, the cleaning composition of the present invention has a pH of from 6.5 to 8.5, so that the circulation line is not damaged. Furthermore, the cleaning composition of the present invention has a specific viscosity, so that it can be added to the circulating water of the circulating water system by means of gravity addition, and no additional motor for extracting the cleaning composition is required. Moreover, the circulating water added with the cleaning composition can maintain the viscosity close to the water, which is beneficial to the flow of the circulating water in the circulating water system, thereby achieving the energy saving effect.

While the invention has been described above in terms of several embodiments, it is not intended to limit the scope of the invention, and the invention may be practiced in various embodiments without departing from the spirit and scope of the invention. The scope of protection of the present invention is defined by the scope of the appended claims.

100‧‧‧ heat exchanger

110‧‧‧Dosing bucket

111‧‧‧ cleaning composition

120‧‧‧Cooling trough

121‧‧‧Cooling water

123‧‧‧Cooling water inlet

125‧‧‧Cooling water outlet

130‧‧‧ pumping pump

140‧‧‧Cooling water pipes

141‧‧‧Watering system

150‧‧‧ wave board

160‧‧‧Processing sink

161‧‧‧Processing water inlet

163‧‧‧Processing water outlet

170‧‧‧ cooling fan

180‧‧‧First valve

190‧‧‧Second valve

200‧‧‧Floating device

210‧‧‧Hydration system

211‧‧‧Connected pipe

213‧‧‧Hydration pump

Arrow ‧ ‧ water flow direction

Claims (10)

A cleaning composition comprising: water (A); an organic acid salt of a fatty alcohol polyoxyethylene ether (B); an organic acid salt of an acrylate polymer (C); and a corrosion inhibitor (D), wherein the corrosion inhibition The agent (D) is composed of an alkoxydecane compound and a phosphorus-containing benzotriazole compound, wherein the organic acid salt of the fatty alcohol polyoxyethylene ether is used based on 100 parts by weight of the water (A). B) is used in an amount of 5 parts by weight to 20 parts by weight, the organic acid salt (C) of the acrylate polymer is used in an amount of from 85 parts by weight to 120 parts by weight, and the corrosion inhibitor (D) is used in an amount of 5 parts by weight. Parts by weight to 15 parts by weight, and the cleaning composition has a pH of from 6.5 to 8.5 and a viscosity of from 300 cps to 400 cps. The cleaning composition according to claim 1, wherein the fatty alcohol of the fatty acid polyoxyethylene ether (B) has a carbon number of at least 7, and the organic acid of the fatty alcohol polyoxyethylene ether One of the salts (B) has a weight average molecular weight of 200 to 500. The cleaning composition according to claim 1, wherein the organic acid salt (C) of the acrylate polymer has a weight average molecular weight of from 3,000 to 5,000. The cleaning composition according to claim 1, wherein the alkoxydecane compound and the phosphorus-containing benzotriazole compound One of the weight ratios is 1.0 to 1.2. The cleaning composition according to claim 1, wherein the amount of the organic acid salt (B) of the fatty alcohol polyoxyethylene ether is 5 parts by weight based on 100 parts by weight of the water (A). The organic acid salt (C) of the acrylate polymer is used in an amount of from 90 parts by weight to 110 parts by weight to 15 parts by weight, and the corrosion inhibitor (D) is used in an amount of from 8 parts by weight to 15 parts by weight. The cleaning composition according to claim 1, wherein the fatty acid polyoxyethylene ether organic acid salt (B) is used in an amount of 10 parts by weight based on 100 parts by weight of the water (A). The organic acid salt (C) of the acrylate polymer is used in an amount of from 100 parts by weight to 110 parts by weight to 15 parts by weight, and the corrosion inhibitor (D) is used in an amount of from 8 parts by weight to 10 parts by weight. A surface cleaning method comprising: providing a circulating water system, wherein the circulating water system comprises: a circulating pipeline, wherein the circulating pipeline is provided with a circulating water inlet, a circulating water outlet, and a pumping pump, and the circulating pipe The road has a metal inner surface; a first valve is disposed on the circulating water inlet; and a second valve is disposed on the circulating water outlet, wherein a circulating water system circulates in the circulating pipeline and contacts the metal Surface, or in and out via the circulating water inlet and the circulating water outlet a circulating water system providing a cleaning composition, wherein the cleaning composition comprises: water (A); an organic acid salt of a fatty alcohol polyoxyethylene ether (B); an organic acid salt of an acrylate polymer (C); and corrosion Inhibitor (D), wherein the corrosion inhibitor (D) comprises an alkoxydecane compound and a phosphorus-containing benzotriazole compound, wherein the fatty alcohol is polyoxylated based on the water (A) used in an amount of 100 parts by weight. The vinyl ether organic acid salt (B) is used in an amount of 5 parts by weight to 20 parts by weight, and the organic acid salt (C) of the acrylate polymer is used in an amount of 85 parts by weight to 120 parts by weight, the corrosion inhibitor ( D) is used in an amount of 5 parts by weight to 15 parts by weight, and the cleaning composition has a pH of 6.5 to 8.5 and a viscosity of 300 cps to 400 cps; and the cleaning composition is 7 liters/day to 10 liters/ One of the days of addition speed is added to the circulating water of the circulating water system. The surface cleaning method according to claim 7, wherein the fatty alcohol of the fatty alcohol polyoxyethylene ether (B) has a carbon number of at least 7, and the fatty acid polyoxyethylene ether organic acid salt (B) One of the weight average molecular weights is from 200 to 500. The surface cleaning method according to claim 7, wherein the organic acid salt (C) of the acrylate polymer has a weight average molecular weight of 3,000 to 5,000. The surface cleaning method according to claim 7, wherein a weight ratio of the alkoxydecane to the phosphorus-containing benzotriazole is 1.0 to 1.2.