Vacuum boiler vacuum is an important indicator of stable operation of the boiler, often affecting the vacuum of the four main elements:
1) the boiler body and valves, instrumentation, there is no point of leakage, including the import of valves and instrumentation can not be guaranteed that the leakage will not be presented within three years.
2) the control of local failure, boiler controller and negative pressure, pressure controller will also be in operation in the onset of the problem is unavoidable, such as domestic controllers on the problem rate is even higher
3) vacuum pumps, three-way solenoid valves can work properly, due to vacuum pumps, three-way solenoid valves are not often run, the original imported are also prone to jamming and operation of the onset of the problem.
4) the load can not have a sudden change in the boiler load change on the boiler is very normal, ordinary boilers can meet the 30% -100% load regulation.
Above the onset of the problem will form a boiler vacuum changes, at this time should check the boiler's airtightness, the control of the local can be normal, the vacuum pump, three-way solenoid valve can be normal, check the load changes in the situation, if they are normal should be checked for negative pressure and the pressure controller settings, everything is normal vacuum restored the boiler can be used normally, or else the furnace should be shut down for maintenance and a full inspection. Vacuum boiler operation in practice, the repair rate is higher than the pressurized steam boiler, control requirements are higher than the steam boiler.
2, atmospheric boiler
Only with the boiler's fundamental time, temperature, water level control, hot water boiler controller selection of original imports, the failure rate is relatively low. Do not have to adhere to the vacuum degree of control equipment, no complex control equipment, personnel operating requirements compared to the vacuum boiler is simple, the chances of downtime maintenance is less, the practice of running up the hot water boiler to be more stable.
Second, the comparison of boiler safety
1, vacuum boiler
If the formation of the above four elements of the boiler vacuum can not be guaranteed, it is possible to form a boiler pressure rises rapidly, the boiler body is a closed structure, the operator, if the numbness is negligent, or the risk of becoming a pressurized steam boiler, vacuum boiler operating under negative pressure is set up in the boiler. Vacuum absolutely can not present problems under the premise.
2, atmospheric boiler
Atmospheric hot water boiler straight through the atmosphere, as simple as boiling water, any problems will not form a boiler pressure, the boiler is more secure and reliable, truly without any risk.
Three, the comparison of boiler thermal efficiency
1, vacuum boiler
Water volume is small, the primary water does not participate in the system cycle, the operation of the quencher to start the number of times more than the atmospheric boiler, the quencher quenching thermal efficiency is low, under the premise of the vacuum degree of comparative stability, the vacuum boiler thermal efficiency of the boiler can reach 91%, boiler attached to the operation of the equipment is unstable formation of the vacuum degree of change will also reduce thermal efficiency. Reduce the thermal efficiency. Running costs can not be stabilized, with the vacuum equipment and control components to reduce the use of years, the increase in the failure rate, the thermal efficiency is reduced.
2, atmospheric boiler
hot water volume than the vacuum boiler, a water is not involved in the system cycle, the quencher start less often, the quencher quenched thermal efficiency is high, the hot water boiler thermal efficiency is also 91%, and the operation of the hot water boiler thermal efficiency is stable, there is not so much as the impact of the equipment failure rate, the construction is simple and durable.
Four, built-in heat exchanger construction method of comparison
1, vacuum boiler
Steam through the thermal exchange to stop, preheating time is short. Boiler with stainless steel "U" tube heat exchanger, one end of the flange can be opened to clean, the other end can not be opened to clean the heat exchanger can not be complete and thorough.
2, atmospheric boiler
Through the water - water to stop the heat transfer, preheating time is longer than the vacuum boiler. Boiler comes with the use of purple copper inline tube heat exchanger, both ends have flanges, cleaning more thoroughly.
Fifth, the boiler body life comparison
1, vacuum boiler
Because of the vacuum boiler negative pressure work, primary water replenishment to reduce the boiler body scaling, oxygen corrosion and other issues, due to the boiler body closed, the primary water can not be annually dosing maintenance, atmospheric boiler has also taken the international advanced anti-scaling, anti-oxygen corrosion measures, the practice of boiler life and atmospheric boiler comparable to Even if the life of the body a little longer, boiler control components, extinguishers, the use of life is not likely to be higher than the atmospheric boiler.
2, atmospheric boiler
Hot water boiler with water softening equipment can restrain the boiler scaling problems, its own indirect hot water boiler make-up water is also very little, the use of sacrificial anode international general maintenance to reduce oxygen corrosion, the boiler can be dosed annually to slow down the oxygen corrosion of the steel plate and the boiler steel plate external heat preservation to take the **** the same way with the two-component heat preservation with water, acid, alkali resistance, Oil-resistant and other functions, due to insulation materials plus glue in the boiler body, to eradicate the boiler steel plate and the air of oxygen corrosion, vacuum boiler using glass wool insulation, can not eradicate the steel plate and the air of oxygen corrosion, so the hot-water boiler service life is not lower than the vacuum boiler, the life expectancy of 2 times the difference is not based on any basis.
Sixth, the world's two boiler consumption comparison
1, vacuum boiler
At present, the world as long as Japan, South Korea, China and a few other countries in a few boiler factory consumption of vacuum boilers, Chinese vacuum boilers in the past few years to simulate the Japan, South Korea began to consume, and are some of the boiler factory was just established. China has the strength of the famous brand boiler factory due to the vacuum boiler in the practical operation of the technical limitations, are not consuming vacuum boilers. China's manufacturing vacuum HVAC equipment Changsha Yuanda, Jiangsu Shuangliang (with a boiler plant) and other famous companies are also not consuming vacuum boilers. World-famous boiler manufacturers in Europe and the United States (such as Germany Raus, Butrus, Fischmann, Spain Lorca, Italy Rialto, Smith, the United States Weimar, AB, etc.) do not consume vacuum boilers, Europe and the United States are simply not used.
2, atmospheric boilers
At present, all countries around the world have the use of hot water boilers, China and all of Europe and the United States, Japan, South Korea and other countries all boiler plants are consuming hot water boilers, there are nearly 100 years of history of use. China has thousands of boiler manufacturers are consuming hot water boilers, the consumption of vacuum boiler manufacturers do not exceed ten, and are just established new boiler plant, the user is even less, as long as a small number of cities use.