1、燃氣集中供暖鍋爐內部防腐濕法堿液法
1. Wet alkali solution method for internal anticorrosion of gas fired central heating boiler
將燃氣集中供暖鍋爐內充滿一定濃度的堿液，並保持pH值在10以上。具體作法如下：水垢和沉渣，保證各閥門嚴密，與運行係統連接的管路加裝盲板。燃氣集中供暖鍋爐位置可安裝—個小型堿液箱，以保證堿液損失時堿液的補充。
The gas-fired central heating boiler is filled with a certain concentration of lye and the pH value is kept above 10. The specific methods are as follows: remove scale and sediment, ensure that the valves are tight, and install blind plates on the pipeline connected with the operation system. A small lye tank can be installed at the highest position of Gas-fired central heating boiler to ensure the supplement of alkali liquor in case of alkali liquor loss.
所用的堿劑為碳酸鈉、氫氧化鈉、磷酸三鈉或其混合劑。配製應使用軟水，不得使用生水。藥劑用量為：碳酸鈉按每噸鍋水加20kg；NaOH按每噸鍋水加5-6kg；Na3PO4按每噸鍋水加10-12kg。通過專用泵將堿液送入鍋內，直水從空氣閥冒出，並保證鍋內水壓大於大氣壓力。保護初期應加強係統嚴密性檢查，正常後應每月監測一次堿液濃度。當堿液濃度低於注入濃度5％時，應補堿。
The alkali agents used are sodium carbonate, sodium hydroxide, trisodium phosphate or their mixture. Soft water shall be used for preparation, and raw water shall not be used. The dosage of sodium carbonate is 20kg per ton of boiler water, 5-6kg of NaOH and 10-12kg of Na3PO4 per ton of boiler water. The lye is sent into the boiler through a special pump until the water comes out from the air valve, and the water pressure in the pot is greater than the atmospheric pressure. The system tightness inspection should be strengthened at the initial stage of protection, and the alkali liquor concentration should be monitored once a month after normal operation. When the concentration of alkali solution is lower than 5% of injected concentration, alkali should be added.
2、燃氣集中供暖鍋爐內部防腐濕法聯氨法
2. Wet hydrazine method for internal anticorrosion of gas fired central heating boiler
此法是在燃氣集中供暖鍋爐內充滿聯氨H2N2和氨NH3的混合液。防腐原理是利用聯氨具有的強還性去除水中氧，即N2H4 O2→N2 2H2O，使陰極極化。同時又利用氨在水溶液中呈堿性，提高pH值，使金屬表麵鈍化，造成陽極極化，以達到防腐目的。因聯氨具有毒性，使用受到限製。
This method is to fill the gas-fired central heating boiler with the mixture of hydrazine H2N2 and ammonia NH3. The anti-corrosion principle is to use the strong reducibility of hydrazine to remove oxygen in water, that is, n2h4o2 → n22h2o, so as to polarize the cathode. At the same time, the use of ammonia in aqueous solution is alkaline, increase the pH value, make the metal surface passivation, resulting in anodic polarization, in order to achieve the purpose of anti-corrosion. The use of hydrazine is limited because of its toxicity.
3、燃氣集中供暖鍋爐內部防腐濕法有機緩蝕阻劑法
3. Wet organic corrosion inhibitor method for internal anticorrosion of gas fired central heating boiler
有機緩蝕阻垢劑是集防腐、防垢、除垢等多種功能的水處理藥劑。其主要成分為聚磷酸鹽、有機磷酸鹽、BTA銅緩蝕劑以及無機堿組成。藥劑為棕紅色液體藥劑，pH≥13，防腐機理為：藥劑溶於水後能水解出帶負電的聚磷根陰離子和帶正電的陽離子，聚磷酸根陰離子在金屬腐蝕電池陽極區與失去電子的Fe2 相結合，生成極難溶於水的聚磷酸鐵，並覆蓋在陽極區的金屬表麵形成陽極極化，被水解的藥劑陽離子在金屬的陰極區奪取電子，變成與金屬親合力很強的原子並被吸附在陰極區的金屬表麵；形成陰極極化。
Organic corrosion and scale inhibitor is a water treatment agent with functions of anti-corrosion, scale prevention and scale removal. The main components are polyphosphate, organic phosphate, BTA copper corrosion inhibitor and inorganic base. The preservative mechanism is that the agent can hydrolyze the negative charged polyphosphate anion and positive cation after dissolving in water, and the polyphosphate anion is in the anode area of metal corrosion cell and Fe2 which loses electron In combination, the iron polyphosphate, which is very difficult to dissolve in water, is formed on the metal surface of the anode area to form anodic polarization. The hydrolyzed reagent cations capture electrons in the cathode area of the metal, and become atoms with strong affinity to the metal and are adsorbed on the metal surface of the cathode area, forming cathodic polarization.
由於上述因素金屬腐蝕被扼止，起到了防腐作用。有機緩蝕阻垢劑pH≥13，按1L藥劑處理4—5噸水，水溶液可保證pH≥10，能有效防止CO2氣體造成的酸腐蝕，同樣起到了防腐作用。有機緩蝕阻垢劑作為停用保養劑使用時，藥劑中有機磷成分還能對鍋爐及汽水係統的水垢、鐵垢中的某些成分起溶解作用，使堅硬的水垢變成結構疏鬆的多孔物。同時能使藥劑滲透到垢下形成保護藥膜，破壞了金屬表層與水垢的結合，使水垢脫落
As a result of the above factors, metal corrosion was stopped, which played a role in corrosion prevention. The pH value of organic corrosion and scale inhibitor is more than or equal to 13. When the water is treated with 1L agent, the pH value of the water solution can be guaranteed to be more than 10, which can effectively prevent the acid corrosion caused by CO2 gas, and it also plays an anti-corrosion role. When the organic corrosion and scale inhibitor is used as the maintenance agent, the organic phosphorus in the agent can also dissolve some components in the scale and iron scale of the boiler and steam water system, making the hard scale become porous with loose structure. At the same time, it can make the agent penetrate under the scale to form a protective film, which destroys the combination of the metal surface layer and the scale, and causes the scale to fall off
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