二氧化氯發(fā)生器在循環(huán)冷卻水與冷凍水處理工藝中的使用情況介紹
ClO2二氧化氯是一種強氧化劑，也是高效、廣譜、安全的殺菌劑。自20世紀70年代中期以來，國外已將二氧化氯用于循環(huán)冷卻水系統(tǒng)的微生物控制。二氧化氯在改善循環(huán)冷卻水系統(tǒng)污泥沉降、控制腐蝕、控制細菌和藻類等方面具有重要作用。20世紀90年代以來，二氧化氯產(chǎn)品在我國循環(huán)冷卻水處理中得到了廣泛的應(yīng)用，并取得了良好的效果。1、 根據(jù)二氧化氯的殺滅特性，控制冷卻水系統(tǒng)微生物生長的方法是添加殺菌劑。常用的殺菌劑有液氯、次氯酸鈉、二氧化氯等氧化性殺菌劑和季銨鹽、氯酚、有機胺等非氧化性殺菌劑。氯氣應(yīng)用廣泛，但堿性環(huán)境會使氯氣的殺菌效果嚴重下降，水中的氯和有機物會產(chǎn)生致癌物，加氯設(shè)備存在潛在的腐蝕和泄漏，促使人們尋求更好的替代產(chǎn)品。
二氧化氯作為一種替代產(chǎn)品，具有以下特點：
1、二氧化氯具有廣譜高效殺菌能力，其有效氯是氯的2.63倍，殺菌效果是氯的5倍。
2、ClO2不受pH值的影響，在堿性條件下，ClO2更有優(yōu)勢。此外，二氧化氯不與氨和氨基化合物發(fā)生反應(yīng)，因此可以保持殺滅能力。這一特性使二氧化氯非常適合于氨廠和煉油廠的冷卻水處理。3、二氧化氯不僅能殺滅微生物，還能分解殘留的細胞結(jié)構(gòu)，有效控制細菌、藻類和黏液，具有泥剝效果，提高傳熱效率。
4、二氧化氯的殺菌作用持續(xù)時間長，長期使用不會對微生物產(chǎn)生耐藥性。同時，二氧化氯的殺菌能力隨著溫度的升高而增強。
二氧化氯在工業(yè)循環(huán)冷卻水中的應(yīng)用：
1、石化總廠腈綸裝置循環(huán)水系統(tǒng)2套，循環(huán)水量5500t/h，截留水量2600t，濃縮倍數(shù)3.0，采用穩(wěn)態(tài)二氧化氯代替氯氣工業(yè)試驗，一次性沖擊加藥2%穩(wěn)態(tài)二氧化氯250kg，有效二氧化氯濃度為0.3mg/l，給藥后24小時異養(yǎng)菌總數(shù)為1.13×102/ml，給藥后48小時異養(yǎng)菌總數(shù)為3.73×102/ml。2某煉油廠循環(huán)水系統(tǒng)采用2%穩(wěn)態(tài)二氧化氯，投加量為20ppm，每三天投加一次，歷時半年以上。
異養(yǎng)菌總數(shù)一般控制在103個/ml，生物泥為1ml/m3，濁度小于10mg/L，清洗汽提時加2%穩(wěn)態(tài)二氧化氯2100mg/L，循環(huán)24小時后水質(zhì)變化效果明顯。濁度從4mg/L逐漸上升到47mg/L，總鐵從04mg/L上升到38mg/L。3、二氧化氯在工業(yè)循環(huán)冷卻水處理中應(yīng)用多年的發(fā)展趨勢證明，二氧化氯具有良好的殺藻殺菌和控制生物泥的作用，對漏氨、漏油的堿處理方案和循環(huán)系統(tǒng)更有效。因此，操作成本低、操作簡單、安全的二氧化氯產(chǎn)品將更容易被用戶接受�；瘜W(xué)二氧化氯發(fā)生器：是一種成熟的產(chǎn)品，常用規(guī)格為30g/H~20000g/H，二氧化氯發(fā)生器由二氧化氯發(fā)生系統(tǒng)、計量控制系統(tǒng)、加藥泵系統(tǒng)等組成，設(shè)備類型為負壓吸入式。反應(yīng)過程為氯酸鈉+鹽酸。該設(shè)備結(jié)構(gòu)合理，設(shè)計精巧，操作方便，安全可靠，使用壽命長，可連續(xù)加藥或間歇沖擊加藥，并可配置在線檢測和自動控制系統(tǒng)，實現(xiàn)無人值守操作。化學(xué)二氧化氯發(fā)生器特別適用于大型循環(huán)水系統(tǒng)。在相同投加量下，沃特桑尼二氧化氯發(fā)生器的成本比穩(wěn)態(tài)二氧化氯發(fā)生器低93%，其標準配置中采用VAREM加藥計量泵與ALIWATER控制系統(tǒng)。一般來說，二氧化氯發(fā)生器在一年內(nèi)的運行成本會降低。以上是沃特桑尼二氧化氯發(fā)生器在工業(yè)循環(huán)冷卻水處理中的應(yīng)用。二氧化氯消毒劑的殺菌效果如何？二氧化氯是一種廣譜高效殺菌劑。國外許多研究結(jié)果表明，二氧化氯在極低濃度（0.1ppm）下能殺滅大腸桿菌、金黃色葡萄球菌等多種致病菌。即使在有機物的干擾下，當(dāng)濃度為幾十ppm時，細菌繁殖體、肝炎病毒、噬菌體和細菌孢子等sy微生物也能被完全殺滅。
Application of chlorine dioxide generator in treatment process of circulating cooling water and chilled water
ClO2 chlorine dioxide is a kind of strong oxidant, and it is also an efficient, broad-spectrum and safe bactericide. Since the mid-1970s, chlorine dioxide has been used in the microbial control of circulating cooling water system abroad. Chlorine dioxide plays an important role in improving sludge sedimentation, controlling corrosion, controlling bacteria and algae in circulating cooling water system. Since the 1990s, chlorine dioxide products have been widely used in the treatment of circulating cooling water in China, and achieved good results. 1. According to the killing characteristics of chlorine dioxide, the way to control the growth of microorganisms in cooling water system is to add fungicides. The commonly used bactericides are oxidizing bactericides such as liquid chlorine, sodium hypochlorite and chlorine dioxide, and non oxidizing bactericides such as quaternary ammonium salt, Chlorophenol and organic amine. Chlorine is widely used, but its germicidal efficacy will be seriously reduced in alkaline environment. Chlorine and organic matter in water will produce carcinogens. There is potential corrosion and leakage in chlorination equipment, which urges people to seek better alternative products.
As an alternative product, chlorine dioxide has the following characteristics: 1. Chlorine dioxide has a broad-spectrum and efficient bactericidal ability. Its effective chlorine is 2.63 times of chlorine and its bactericidal effect is 5 times of chlorine. 2clo2 is not affected by pH value, and ClO2 is more advantageous in alkaline condition. In addition, chlorine dioxide does not react with ammonia and amino compounds, so it can maintain its killing ability. This characteristic makes chlorine dioxide very suitable for ammonia plant and refinery cooling water treatment. Three. Chlorine dioxide can not only kill microorganisms, but also decompose the residual cell structure, effectively control bacteria, algae and mucus, with mud stripping effect and improve heat transfer efficiency. The bactericidal effect of chlorine dioxide lasts for a long time, and long-term use will not produce drug resistance to microorganisms. At the same time, the bactericidal ability of chlorine dioxide increased with the increase of temperature. 2. Application of chlorine dioxide in industrial circulating cooling water 1. There are 2 sets of circulating water system in acrylic fiber plant of general petrochemical plant, with circulating water 5500t / h, intercepted water 2600t and concentration multiple of 3.0. Steady state chlorine dioxide is used to replace chlorine gas in industrial test. 2% steady state Chlorine Dioxide 250kg is added at one time. The effective chlorine dioxide concentration is 0.3mg/l. The total number of heterotrophic bacteria is 1.13 × 102 / ml 24 hours after administration and 3.73 × 102 / ml 48 hours after administration. 2. The circulating water system of a refinery adopts 2% stable chlorine dioxide with a dosage of 20ppm, which is added every three days for more than half a year.
The total number of heterotrophic bacteria is generally controlled at 103 / ml, the biological sludge is 1ml / m3, the turbidity is less than 10mg / L, and 2% stable chlorine dioxide 2100mg / L is added during cleaning stripping. The effect of water quality change is obvious after 24 hours of circulation. Turbidity increased from 4mg / L to 47mg / L, and total iron increased from 04mg / L to 38mg / L. 3. The development trend of chlorine dioxide used in industrial circulating cooling water treatment for many years has proved that chlorine dioxide has a good function of killing algae and controlling biological sludge, and is more effective for alkali treatment scheme and circulating system with ammonia leakage and oil leakage. Therefore, chlorine dioxide products with low operation cost, simple operation and safety will be more easily accepted by users. Chemical chlorine dioxide generator: it is a mature product, with the common specification of 30g / H ~ 20000g / h. It is composed of chlorine dioxide generation system, metering control system, dosing system, etc., and the equipment type is negative pressure suction type. The reaction process is sodium chlorate + hydrochloric acid. The equipment has reasonable structure, exquisite design, convenient operation, safe and reliable, long service life, continuous dosing or intermittent impact dosing, and can be equipped with online detection and automatic control system to realize unattended operation. Chemical chlorine dioxide generator is especially suitable for large circulating water system. At the same dosage, the cost of watersunny chlorine dioxide generator is 93% lower than that of steady-state chlorine dioxide generator. In its standard configuration, Varem dosing metering pump and alwater control system are used. Generally speaking, the operation cost of chlorine dioxide generator will be reduced within one year. The above is the application of watersunny chlorine dioxide generator in industrial circulating cooling water treatment. What is the germicidal efficacy of chlorine dioxide disinfectant? Chlorine dioxide is a broad-spectrum and efficient bactericide. Many studies abroad have shown that chlorine dioxide can kill many pathogenic bacteria such as Escherichia coli and Staphylococcus aureus at very low concentration (0.1ppm). Even under the interference of organic matter, sy microorganisms such as bacterial propagules, hepatitis virus, bacteriophages and bacterial spores can be completely killed when the concentration is tens of ppm.