1 lye method Fill the pot with a certain concentration of lye and keep the pH above 10. The specific practices are as follows: remove scale and sediment, ensure that the valves are tight, and add blind plates to the pipes connected to the operating system. Boiler Zui high position can be installed - a small alkaline tank to ensure
The lye is supplemented when the lye is lost. The alkaline agent used is Na2CO4, NaOH, Na3PO4 or a mixture thereof. Soft water should be used during preparation, and raw water should not be used. The dosage of the agent is: Na2CO4 is added 20kg per pot of water; NaOH is added 5~6kg per pot of water; Na3PO4 is added 10~ per pot of water
12kg. The lye is sent to the pot through a special pump until the water emerges from the air valve and the water pressure in the pot is greater than atmospheric pressure. In the initial stage of protection, the system should be strengthened for rigorous inspection. After normal, the concentration of lye should be monitored once a month. When the concentration of the lye is lower than 5% of the original injection concentration, the alkali should be supplemented.
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2 hydrazine method The boiler is filled with hydrazine (a mixture of H2N2 and ammonia (NH3)). The principle of corrosion protection is to remove the oxygen in the water by the strong reducibility of hydrazine to polarize the cathode. At the same time, ammonia is alkaline in aqueous solution, which can increase the pH value and passivate the metal surface, resulting in an anode pole.
To achieve anti-corrosion purposes. Because hydrazine is toxic, its use is limited.
3 organic corrosion and scale inhibitor method Organic corrosion and scale inhibitor is a collection of anti-corrosion, anti-scaling, descaling and other functions in one of the water treatment agents. Its main components are polyphosphates, organic phosphates, BTA copper corrosion inhibitors and inorganic bases. The drug is brown red liquid, pH ≥13, antiseptic
The mechanism is: after the agent is dissolved in water, it can hydrolyze the negatively charged polyphosphate anion and the positively charged cation. The polyphosphate anion combines with Fe2+ in the anode region of the metal corrosion cell to form iron polyphosphate which is extremely insoluble in water. And covering the metal surface of the anode region to form an anode pole
The hydrolyzed agent cation captures electrons in the cathode region of the metal, becomes an atom having a strong affinity with the metal, and is adsorbed on the metal surface of the cathode region to form a cathodic polarization. Therefore, the corrosion of the metal is stopped and the antiseptic effect is exerted. Organic corrosion and scale inhibitor pH ≥ 13,
Treating 4~5t water according to 1L agent, the aqueous solution can ensure the pH value ≥10, which can effectively prevent the acid corrosion caused by CO2 gas, and also plays an antiseptic effect. When the organic corrosion and scale inhibitor is used as a decommissioning maintenance agent, the organic phosphorus component in the medicament can also be used for scale and iron in boilers and soda systems.
Some of the components in the scale act to dissolve, making the hard scale a loose porous structure. At the same time, the agent can penetrate into the scale to form a protective film, which destroys the combination of the surface layer and the scale, and causes the scale to fall off.
4 Biomass boiler dry method Maintenance method is to stop the water after the boiler is deactivated and keep the metal surface dry, or fill a certain gas to prevent the intrusion of air, thus achieving the purpose of decommissioning maintenance.
The aeration method generally uses nitrogen or ammonia gas in the cylinder to charge from the high point of the boiler and maintain a pressure of 0.05 to 0.1 MPa, forcing the dense air to be discharged from the lower part of the boiler, so that the metal is not in contact with oxygen. This method has good maintenance effect, but the conditions are strict and the operation process is complex.
Miscellaneous, limited use.
Desiccant method This method utilizes the characteristics of hygroscopic moisture absorption to make the metal surface in the pot sufficiently dry, thereby achieving the purpose of antiseptic.
The operation method is as follows: all the pot water is discharged, the scale, the sludge and the rust are removed, the pipes are blocked by the blind plate, the manhole and the hand hole are opened, and the furnace is dried. Then, the desiccant is placed in the drum and the header according to the predetermined arrangement position, and the drum and the header are closed, and the valves are closed.
The door keeps the inside of the pot from the outside and keeps the surface of the boiler dry for a long time. Quicklime or anhydrous calcium chloride should be placed in the iron pan and the silica gel can be placed in the bag. The amount of desiccant placed is generally: quicklime is 2 to 3 kg per m3 of boiler volume; anhydrous calcium chloride is per m3 of boiler volume 1
~2kg; silica gel is 1~2kg per m3 boiler volume (drying at 120~140°C before use of silica gel). At the same time, the desiccant should be checked regularly, the interval is: * 7 to 10d; the second and second months; Check it once a month later. If silicone is used, it should be taken out and dried and put back.
Replace regularly.
5 Biogas boiler gas phase maintenance Traditional water system maintenance is more complicated in practice, and the medium and small boiler room is not fully equipped, so the actual anti-corrosion effect is not satisfactory. Gas phase corrosion inhibitor is a new type of agent applied to boiler anticorrosion in recent years, mainly inorganic ammonium salts and
Organic amines such as ammonium carbonate, ammonium hydrogencarbonate, urea, cyclohexylamine carbonate, and the like. These agents are highly volatile and condense on the surface of the metal to provide full protection. The anti-corrosion mechanism is that the inorganic ammonium salt is hydrolyzed into ammonia gas, which inhibits the metal, and the organic amine dissociation substance
Combined with the metal by a coordination bond, adsorption on the surface of the metal forms an anodic polarization, thereby reducing the reactivity of the metal.
At present, the widely used TH2901 semi-dry protective agent belongs to the gas phase corrosion inhibitor protective agent. Compared with traditional dry and wet methods, TH2901 vapor phase corrosion inhibitor maintenance method is only 1/7 of dry maintenance, 1/105 of wet maintenance, and comprehensive protection.
Protects the metal in the gas phase and protects the metal in a wet state; not only protects the non-scaling metal, but also protects the metal under the scale. The drug has achieved good anti-corrosion effect during the maintenance period of the steam boiler or the hot water boiler. The boiler steel plate has been tested and tested.
The corrosion rate is only 0.036mg / a, which is superior to the traditional maintenance method. The method of use is as follows: first emptying the pot water, removing the dirt in the pot, adding the medicine in the header box and the boiler, and the medicine is placed in the tray, and the protective agent can also be sprinkled into the pot. The dosage is 1~2kg per m3 water capacity of the boiler, and the header and the drum are cast.
The dose is calculated as 1:6 or 1:7. The medicine is harmless to the boiler. When the boiler is restarted, it is not necessary to remove the medicine, and only the container can be taken out. It should be noted that when there is too much water in the pot after draining, the amount of medicine can be increased by 0.5 to 1 times. This method is simpler to operate than traditional maintenance.
There is no need to add medicine, no need for personnel supervision, labor saving, time saving, and good effect. Even if there is residual water in the pot or the seal is not strict, it will not affect the anti-corrosion effect.
Principles for selection of biomass boiler maintenance methods
According to the deactivation time, the following methods can be selected: lye method is selected for 1 to 3 months; desiccant method, organic corrosion and scale inhibitor method, vapor phase corrosion inhibitor method (TH2901), coating method are selected for more than 3 months.
According to the maintenance object, you can refer to the following methods: long-term maintenance of steam boiler can choose desiccant method, gas phase corrosion inhibitor method (TH2901), lye method, organic corrosion and scale inhibitor method; hot water boiler and water circulation system can choose alkali Liquid method and organic corrosion inhibitor method, water bath
The desiccant method should not be used in the furnace.
Biomass boiler maintenance requirements
In principle, after the furnace is shut down, the ash and descaling should be immediately removed, and the inspection time should be submitted to the technical supervision department in time for early inspection, early maintenance and early maintenance. Under the premise of the conditions, the boiler should be maintained immediately after it is deactivated. The advantage is: the water resources in the system can be utilized and perfected.
The operation facilities save manpower and material resources; good water quality and perfect operation system can make maintenance measures fall into practice, achieving the purpose of small dosage, uniform chemicals, wide coverage, no dead angle, easy monitoring and adjustment; maintenance effect Guaranteed, no water is put in place to prevent the air from entering
Incorporation and addition of chemicals enhance the metal's ability to resist corrosion. In addition, maintenance inspections should be strengthened, especially during the rainy season.
When there is dirt inside the biomass boiler, the heating surface in the boiler can not effectively transfer the heat, and the transmission effect is reduced. When the boiler is exhausting, the internal heat is completely discharged along with the smoke, and the heat energy is reduced.
When the internal pipeline is dirty, the flow area of ​​the pipeline will become smaller, the circulation of water will be blocked, and normal circulation will not be possible. When the dirt falls off, the pipeline may be blocked. In the long run, some pressure equipment will expand. Hazardous situation such as deformation
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The appearance of dirt will lead to a reduction in the heating efficiency of biomass boilers, a shortened working life of the equipment, and an increase in boiler maintenance funds. Let's take a closer look at how the Green Detective HVAC expert explains how to solve the dirt inside the boiler.
1. Try to use water with low fouling rate or salt reduction for existing water quality.
2. Adding a treatment agent to the water circulation system in the biomass boiler to treat the water slag which is easy to form dirt, so that the precipitation does not scale, and then discharge the water slag regularly.
3. Use special descaling agent to regularly remove the dirt on the inner wall of the boiler and the inner wall of the pipeline. After cleaning, rinse with clean water until the water is discharged into the pipeline.
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