1、燃气集中供暖锅炉内部防腐湿法碱液法
1. Wet alkali solution method for internal anticorrosion of gas fired central heating boiler
将燃气集中供暖锅炉内充满一定浓度的碱液，并保持pH值在10以上。具体作法如下：水垢和沉渣，保证各阀门严密，与运行系统连接的管路加装盲板。燃气集中供暖锅炉位置可安装—个小型碱液箱，以保证碱液损失时碱液的补充。
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.
所用的碱剂为碳酸钠、氢氧化钠、磷酸三钠或其混合剂。配制应使用软水，不得使用生水。药剂用量为：碳酸钠按每吨锅水加20kg；NaOH按每吨锅水加5-6kg；Na3PO4按每吨锅水加10-12kg。通过专用泵将碱液送入锅内，直水从空气阀冒出，并保证锅内水压大于大气压力。保护初期应加强系统严密性检查，正常后应每月监测一次碱液浓度。当碱液浓度低于注入浓度5％时，应补碱。
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、燃气集中供暖锅炉内部防腐湿法联氨法
2. Wet hydrazine method for internal anticorrosion of gas fired central heating boiler
此法是在燃气集中供暖锅炉内充满联氨H2N2和氨NH3的混合液。防腐原理是利用联氨具有的强还性去除水中氧，即N2H4 O2→N2 2H2O，使阴极极化。同时又利用氨在水溶液中呈碱性，提高pH值，使金属表面钝化，造成阳极极化，以达到防腐目的。因联氨具有毒性，使用受到限制。
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、燃气集中供暖锅炉内部防腐湿法有机缓蚀阻剂法
3. Wet organic corrosion inhibitor method for internal anticorrosion of gas fired central heating boiler
有机缓蚀阻垢剂是集防腐、防垢、除垢等多种功能的水处理药剂。其主要成分为聚磷酸盐、有机磷酸盐、BTA铜缓蚀剂以及无机碱组成。药剂为棕红色液体药剂，pH≥13，防腐机理为：药剂溶于水后能水解出带负电的聚磷根阴离子和带正电的阳离子，聚磷酸根阴离子在金属腐蚀电池阳极区与失去电子的Fe2 相结合，生成极难溶于水的聚磷酸铁，并覆盖在阳极区的金属表面形成阳极极化，被水解的药剂阳离子在金属的阴极区夺取电子，变成与金属亲合力很强的原子并被吸附在阴极区的金属表面；形成阴极极化。
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.
由于上述因素金属腐蚀被扼止，起到了防腐作用。有机缓蚀阻垢剂pH≥13，按1L药剂处理4—5吨水，水溶液可保证pH≥10，能有效防止CO2气体造成的酸腐蚀，同样起到了防腐作用。有机缓蚀阻垢剂作为停用保养剂使用时，药剂中有机磷成分还能对锅炉及汽水系统的水垢、铁垢中的某些成分起溶解作用，使坚硬的水垢变成结构疏松的多孔物。同时能使药剂渗透到垢下形成保护药膜，破坏了金属表层与水垢的结合，使水垢脱落
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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