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Boilers are operated under high temperature and pressure conditions, and their safety requirements are quite strict. As the smoke, fire, ash, water vapor, and scale under certain conditions cause corrosion and damage to the boiler components, resulting in the corresponding stress changes, fatigue damage of the pressure components, heat transfer obstacles, it may cause damage after heating in the high temperature area. , bulging, cracking or even exploding.
Second, the cause of scale When the water is heated to a certain temperature in the boiler, it continuously evaporates so that the concentration of calcium and magnesium ions and salt in the water in the boiler becomes higher and higher. When the concentration exceeds the solubility, the salts precipitate out of the water, and most of the adherence occurs. In the pot wall and pipes, affect heat transfer and cause serious safety hazards. The formed scale forms a potential difference between the pot water and the boiler body, which can cause electrochemical corrosion and cause hydrogen embrittlement.
Third, the hazard of scale 1, the thermal conductivity of scale is poor, lower than the thermal conductivity of carbon steel 30 to 50 times, so that the boiler heat absorption of water to reduce the evaporation to reduce waste of fuel, reduce the amount of gas. According to the test, generating 1 mm of scale consumes 5 to 8 percent more energy, and boiler efficiency decreases by 1 to 2 percent.
2, easy to cause accidents, the formation of interrupted operation. After scaling on the heated surface, the temperature of the heated surface increases, stress fatigue is compromised, and the strength decreases. In severe cases, the metal is thermally deformed and explosion accidents are likely to occur.
3, cause scale corrosion, shorten the boiler life. Due to the long-term presence of scale, there is a potential difference in the furnace water, which leads to corrosion under the scale of the furnace body and reduces the service life of the boiler.
Fourth, countermeasures 1, chemical cleaning, must be implemented by the corresponding professional qualifications units, so as to ensure the safety performance of the boiler.
2, keep the furnace clean. If the production task is busy, the steam production will be significantly reduced and the pressure will not be able to be achieved. Taking into account the potential safety hazards, non-stop furnace cleaning can be used to remove all scale, and the passivation is completed in a weak alkaline condition once, for the boiler machinery. No adverse effects on performance and service life, no impact on production, non-toxic harmless, no pollution, no impact on steam quality, no waste liquid discharge. The descaling cycle takes 30 to 40 days. After cleaning, the boiler operation saves energy up to 30%.
3, run the drug, according to a certain amount of boiler anti-fouling agent in the use of the boiler to reduce the concentration of calcium and magnesium ions in the water to prevent boiler fouling.
4. When the boiler is deactivated, use the boiler maintenance agent to prevent the boiler from corrosion.
V. Economic Benefit Analysis Case 1: A 4T/H boiler of a company in Rui'an is operated 24 hours before cleaning. It consumes more than 11 tons of coal, and it consumes more than 8 tons of coal after 24 hours of cleaning. Day coal is up to 3 tons. Coal is calculated at a market price of 650 yuan/ton, and 650 yuan/ton*3 tons=1950 yuan, which can save 58,500 yuan a month.
Case 2: Longwan a company 4T/H, scale thickness 1.5mm, scale 24 hours of operation, coal consumption of about 10.5 tons, after cleaning the company's anti-scale and scale remover: no scale 24 hours operation, coal consumption 9.5 Ton, saving 1 ton of coal a day, according to the market price of 650 yuan, can save 20,000 yuan in January.
Case 3: An enterprise in Rui'an collapsed due to the water wall and stopped the maintenance.
Cost: 30,000 yuan for maintenance; 10,000 yuan for transformer modification; 20,000 yuan for worker's wages due to factory shutdown; total cost is more than 80,000 yuan, which does not include profits from the shutdown of factories and Other indirect losses.
Six, overview:
Two steam boilers with an evaporation capacity of 6 tons/hour.
Seventh, specific plan:
(1) Cleaning Process Cleaning Process: Inspecting → Hydrostatic Testing → Establishing a Circulatory System → Water Rinsing → Hanging Test Pieces → Pickling → Taking a Test Piece → Water Washing (Adding Lime Treatment Waste Liquid) → Rinsing → Neutralization → Passivation → Water rinse (add acid treatment waste liquid) → Sealed or used (b) Wash step 1. Hydrostatic test: time 3 to 4 hours, check whether the system has leaked.
2, alkali conversion: time 36 to 48 hours.
2, pickling: time 8 to 10 hours.
3, water rinse: time 3 to 4 hours.
4, rinse: time 3 hours.
5, in and: time 3 to 4 hours.
6, passivation: time 8 hours. A temperature of 80 to 90°C produces a protective film in the system. Coal, steam, gas, 2 ton boiler cleaning program
Coal, steam, gas, 2 ton boiler cleaning program
Coal-fired, steam-fired, gas-fired, 2-ton boiler-cleaning scheme Boiler-cleaning scheme for coal-fired, steam-fired, gas-fired, 2-ton boiler-cleaning schemes I. Overview Boilers use water or other thermal energy to release heat from water or other heat to heat water or other media. Equipment that obtains specified parameters (temperature, pressure) and quality steam, hot water, or other media.
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