CN105987372A - Boiler cleaning method - Google Patents
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- CN105987372A CN105987372A CN201510084574.6A CN201510084574A CN105987372A CN 105987372 A CN105987372 A CN 105987372A CN 201510084574 A CN201510084574 A CN 201510084574A CN 105987372 A CN105987372 A CN 105987372A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005554 pickling Methods 0.000 claims abstract description 26
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 20
- 238000002161 passivation Methods 0.000 claims abstract description 18
- 230000007797 corrosion Effects 0.000 claims abstract description 12
- 238000005260 corrosion Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 239000003112 inhibitor Substances 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 6
- PXAJQJMDEXJWFB-UHFFFAOYSA-N acetone oxime Chemical compound CC(C)=NO PXAJQJMDEXJWFB-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- -1 glycolic acid compound Chemical class 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000013530 defoamer Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000000243 solution Substances 0.000 description 6
- 150000007524 organic acids Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000009965 odorless effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
技术领域technical field
本发明涉及锅炉清洗领域，尤其涉及一种高效的锅炉清洗方法。The invention relates to the field of boiler cleaning, in particular to an efficient boiler cleaning method.
背景技术Background technique
工业锅炉的清洗一直是清洗行业中探讨的问题，随着锅炉用水在使用时不断循环和浓酸，水中的矿物质含量也会不断增加，从而引起炉体壁结垢、氧腐蚀。由于锅炉的构造复杂，因而发生积垢现象后的清洗工序比较困难，采用传统的物理清洗和机械疏通方法都难得清洗干净。而现有的化学清洗方法也比较单一，通常采用盐酸进行清洗，但清洗效果依然不理想，特别在死区位置会有污垢的残留和清洗剂的残留。长此以往，无疑会影响锅炉系统的运行，甚至给锅炉的安全运行带来隐患。The cleaning of industrial boilers has always been a problem discussed in the cleaning industry. With the continuous circulation of boiler water and concentrated acid during use, the mineral content in the water will continue to increase, which will cause scaling and oxygen corrosion on the furnace wall. Due to the complex structure of the boiler, the cleaning process after fouling occurs is relatively difficult, and it is difficult to clean it by traditional physical cleaning and mechanical dredging methods. And the existing chemical cleaning method is also relatively simple, usually adopts hydrochloric acid to clean, but the cleaning effect is still unsatisfactory, especially there will be dirt residue and cleaning agent residue in the dead zone. If things go on like this, it will undoubtedly affect the operation of the boiler system, and even bring hidden dangers to the safe operation of the boiler.
故此，亟需一种改进的锅炉清洗方法，以克服以上的缺陷。Therefore, there is an urgent need for an improved boiler cleaning method to overcome the above defects.
发明内容Contents of the invention
本发明的目的在于提供一种锅炉清洗方法，其能有效清洗锅炉的死区位置，而且延缓活性金属表面结垢，从而保证锅炉的安全运行，适于工业推广应用。The purpose of the present invention is to provide a boiler cleaning method, which can effectively clean the dead zone of the boiler, and delay the fouling on the surface of the active metal, thereby ensuring the safe operation of the boiler, which is suitable for industrial promotion and application.
为实现上述目的，本发明的锅炉清洗方法，包括以下步骤：To achieve the above object, the boiler cleaning method of the present invention comprises the following steps:
酸洗步骤：加入质量分数为3％～6％的羟基乙酸复合酸及质量分数为0.3％～0.5％的缓蚀剂在80～95度下循环清洗预定时长；以及Pickling step: add glycolic acid compound acid with a mass fraction of 3% to 6% and a corrosion inhibitor with a mass fraction of 0.3% to 0.5%, and cycle cleaning at 80 to 95 degrees for a predetermined time; and
钝化步骤：排放酸洗废液后加入质量分数为0.15％～0.25％的二甲基酮肟复合钝化剂在70～80度下进行钝化。Passivation step: after discharging the pickling waste liquid, add dimethyl ketoxime composite passivator with a mass fraction of 0.15% to 0.25% to passivate at 70 to 80 degrees.
与现有技术相比，本发明的锅炉清洗方法采用采用羟基乙酸复合酸进行酸洗，并采用二甲基酮肟复合钝化剂进行钝化，能有效清洗锅炉的死区位置，且延缓活性金属表面结垢，适于工业推广应用。Compared with the prior art, the boiler cleaning method of the present invention adopts glycolic acid compound acid for pickling and dimethyl ketoxime compound passivator for passivation, which can effectively clean the dead zone of the boiler and delay the activity Scaling on the metal surface is suitable for industrial promotion and application.
作为一个优选实施例，所述酸洗步骤还包括加入质量分数为0.3％～0.5％的除铜剂，和/或消泡剂，和/或还原剂。As a preferred embodiment, the pickling step further includes adding copper removing agent, and/or defoaming agent, and/or reducing agent with a mass fraction of 0.3%-0.5%.
较佳地，所述酸洗步骤具体包括：当温度上升到50～60度时加入所述缓蚀剂并循环运行1～1.5小时，继而依次加入所述羟基乙酸复合酸、所述除铜剂、和/或所述消泡剂，和/或所述还原剂。Preferably, the pickling step specifically includes: when the temperature rises to 50-60 degrees, adding the corrosion inhibitor and circulating it for 1-1.5 hours, and then sequentially adding the glycolic acid complex acid and the copper removing agent , and/or the defoamer, and/or the reducing agent.
较佳地，还包括定时检测洗液中铁离子总量及酸质量分数。Preferably, it also includes regularly detecting the total amount of iron ions and the mass fraction of acid in the washing solution.
较佳地，所述酸洗步骤的循环清洗的预定时长为8～10小时。Preferably, the predetermined duration of the cycle cleaning in the pickling step is 8-10 hours.
作为另一实施例，在所述酸洗步骤后还包括加入除盐水将酸洗废液顶排出，直至铁离子总量小于100mg/L。As another embodiment, after the pickling step, it also includes adding demineralized water to discharge the pickling waste liquid until the total amount of iron ions is less than 100 mg/L.
较佳地，所述钝化步骤的时长为4～5小时。Preferably, the duration of the passivation step is 4-5 hours.
较佳地，所述钝化步骤之后还包括排放钝化液并对锅炉进行干燥。Preferably, after the passivation step, it also includes discharging the passivation solution and drying the boiler.
较佳地，在所述酸洗步骤之前还包括灌注除盐水，流量为300～350吨/小时。Preferably, before the pickling step, it also includes pouring desalted water, with a flow rate of 300-350 tons/hour.
附图说明Description of drawings
图1为本发明的锅炉清洗方法的一个实施例的流程图。Fig. 1 is a flowchart of an embodiment of the boiler cleaning method of the present invention.
图2为本发明的锅炉清洗方法的另一实施例的流程图。Fig. 2 is a flowchart of another embodiment of the boiler cleaning method of the present invention.
具体实施方式detailed description
下面结合实施例对本发明的锅炉清洗方法作进一步说明，但不因此限制本发明。The boiler cleaning method of the present invention will be further described below in conjunction with the examples, but the present invention will not be limited thereby.
本发明的锅炉清洗方法利用羟基乙酸复合酸在循环系统中进行清洗。图1所示，本发明的第一个实施例包括以下步骤：The boiler cleaning method of the present invention utilizes glycolic acid complex acid to clean in a circulation system. Shown in Fig. 1, first embodiment of the present invention comprises the following steps:
101，酸洗步骤：加入质量分数为3％～6％的羟基乙酸复合酸及质量分数为0.3％～0.5％的缓蚀剂在80～95度下循环清洗预定时长；以及101. Pickling step: add glycolic acid compound acid with a mass fraction of 3% to 6% and a corrosion inhibitor with a mass fraction of 0.3% to 0.5%, and cycle cleaning at 80 to 95 degrees for a predetermined time; and
102，钝化步骤：排放酸洗废液后加入质量分数为0.15％～0.25％的二甲基酮肟复合钝化剂在70～80度下进行钝化。102. Passivation step: after discharging the pickling waste liquid, add a dimethyl ketoxime composite passivator with a mass fraction of 0.15%-0.25% to passivate at 70-80°C.
本发明的酸洗步骤采用羟基乙酸复合酸，羟基乙酸复合酸为有机酸，其具有腐蚀性低、不易燃、无臭、生物分解性强、水溶性好等特点，除垢能力强，对于氧化铁锈、铁垢、硅垢有很好的溶解能力。而且在清洗时不会有有机酸铁沉淀，溶液处理清洗废液。再且，羟基乙酸复合酸的分子结构中没有诱发金属材料应力腐蚀的敏感离子，对于金属的腐蚀性小，特别适用于锅炉等发热装置的清洗。The pickling step of the present invention adopts glycolic acid compound acid, which is an organic acid, which has the characteristics of low corrosion, non-flammable, odorless, strong biodegradability, good water solubility, etc. Rust, iron scale, silicon scale has a good dissolving ability. Moreover, there will be no precipitation of organic acid iron during cleaning, and the solution will treat the cleaning waste liquid. Moreover, the molecular structure of the glycolic acid complex acid has no sensitive ions that induce stress corrosion of metal materials, and is less corrosive to metals, and is especially suitable for cleaning heating devices such as boilers.
具体地，作为一个优选实施例，图2展示了本发明的进一步改良的锅炉清洗方法。Specifically, as a preferred embodiment, Fig. 2 shows a further improved boiler cleaning method of the present invention.
201，酸洗步骤。具体地，酸洗步骤在灌注除盐水的循环系统中进行，除盐水的注入流量在300～350吨/小时，建立循环回路，并使循环系统升温。当除盐水的温度到达50～60度左右时，向清洗箱中均匀加入质量分数为0.3％～0.5％的缓蚀剂，并循环1～1.5小时，继而，加入质量分数为3％～6％的羟基乙酸复合酸。可选地，可根据锅炉中的镀铜情况加入适量的除铜剂；并根据泡沫大小加入适量的消泡剂；并根据测定的铁离子含量大小加入还原剂，从而控制Fe3+的含量小于300mg/L。需注意的是，上述的除铜剂、消泡剂、还原剂可采用传统的药剂并依据实际情况加入，并不受限制。在加药完成后，保持循环系统的水温为80～95度，循环时间为8～10小时。201, pickling step. Specifically, the pickling step is carried out in a circulation system filled with desalinated water, and the injection flow rate of desalinated water is 300-350 tons/hour to establish a circulation loop and raise the temperature of the circulation system. When the temperature of the desalinated water reaches about 50-60 degrees, evenly add a corrosion inhibitor with a mass fraction of 0.3%-0.5% into the cleaning tank, and circulate for 1-1.5 hours, and then add a mass fraction of 3%-6% glycolic acid complex acid. Alternatively, an appropriate amount of copper remover can be added according to the copper plating situation in the boiler; and an appropriate amount of defoamer can be added according to the size of the foam; 300mg/L. It should be noted that the above-mentioned copper remover, defoamer, and reducing agent can be added according to actual conditions without limitation. After the dosing is completed, keep the water temperature of the circulation system at 80-95 degrees, and the cycle time is 8-10 hours.
较佳地，为更好掌握清洗效果，在清洗过程中可定时检测洗液中全铁离子总量以及酸质量分数。具体地，每隔一小时化验一次，待出口全铁离子总量在2～3次的取样化验结果基本不变，出口酸的质量分数在2～3次取样化验的结果基本不变，说明监视管段清洗干净，结束酸洗。Preferably, in order to better grasp the cleaning effect, the total amount of all iron ions and the mass fraction of acid in the washing solution can be regularly detected during the cleaning process. Specifically, test once every hour, the results of the sampling test for the total amount of total iron ions at the outlet are basically unchanged for 2 to 3 times, and the results of the sampling test for the mass fraction of the acid at the outlet are basically unchanged, indicating that the monitoring Clean the pipe section and end the pickling.
步骤202，冲洗顶排。在酸洗步骤结束后,用除盐水对系统进行顶酸冲洗，冲洗至出口水质目测澄清，且出口处全铁离子总量小于100mg/L，说明锅炉内铁锈已被有效清除。Step 202, flush the top row. After the pickling step, rinse the system with demineralized water until the water quality at the outlet is visually clarified, and the total amount of total iron ions at the outlet is less than 100mg/L, indicating that the rust in the boiler has been effectively removed.
步骤203，钝化步骤。具体地，在冲洗结束后，建立除盐水系统循环回路，继续对系统加热，当回液温度60度时加入质量分数0.15％～0.25％二甲基酮肟复合钝化剂，并控制温度70～80度，在此温度下循环4～5小时后排放。经过此钝化步骤后，锅炉金属内壁上形成致密的钝化保护膜，从而防止清洗干净的活性金属再次被氧化。Step 203, a passivation step. Specifically, after the flushing is completed, establish a desalinated water system circulation loop, continue to heat the system, add a mass fraction of 0.15% to 0.25% dimethyl ketoxime composite passivator when the return liquid temperature is 60 degrees, and control the temperature to 70 to 80 degrees, and discharge at this temperature for 4 to 5 hours. After this passivation step, a dense passivation protective film is formed on the inner wall of the boiler metal, thereby preventing the cleaned active metal from being oxidized again.
步骤204，干燥处理。钝化结束后迅速排放钝化液，并将锅炉内所有的阀门打开,将水份排出从而干燥。至此，整个清洗过程完成。Step 204, drying process. After the passivation is completed, quickly discharge the passivation solution, and open all the valves in the boiler to drain the water and dry it. So far, the whole cleaning process is completed.
综上所述，本发明的酸洗步骤采用羟基乙酸复合酸，羟基乙酸复合酸为有机酸，其具有腐蚀性低、不易燃、无臭、生物分解性强、水溶性好等特点，除垢能力强，对于氧化铁锈、铁垢、硅垢有很好的溶解能力。而且在清洗时不会有有机酸铁沉淀，溶液处理清洗废液。再且，羟基乙酸复合酸的分子结构中没有诱发金属材料应力腐蚀的敏感离子，对于金属的腐蚀性小，特别适用于锅炉等发热装置的清洗。本发明的钝化步骤使得锅炉金属内壁上形成致密的钝化保护膜，从而防止清洗干净的活性金属再次被氧化并延缓活性金属表面结垢，适于工业推广应用。In summary, the pickling step of the present invention adopts glycolic acid compound acid, which is an organic acid, which has the characteristics of low corrosion, non-flammable, odorless, strong biodegradability, good water solubility, etc. Strong ability, good dissolving ability for oxidized rust, iron scale and silicon scale. Moreover, there will be no precipitation of organic acid iron during cleaning, and the solution will treat the cleaning waste liquid. Moreover, the molecular structure of the glycolic acid complex acid has no sensitive ions that induce stress corrosion of metal materials, and is less corrosive to metals, and is especially suitable for cleaning heating devices such as boilers. The passivation step of the invention forms a dense passivation protective film on the metal inner wall of the boiler, thereby preventing the cleaned active metal from being oxidized again and delaying the fouling on the surface of the active metal, which is suitable for industrial popularization and application.
以上所揭露的仅为本发明的较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明申请专利范围所作的等同变化，仍属本发明所涵盖的范围。The above disclosures are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the patent scope of the present invention still fall within the scope of the present invention.
Claims (9)
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Application publication date: 20161005 |
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