4 tons of gas commercial steam boiler 20t ukraine blowdown should pay attention to what matters should be ① the sewage at low load, high water level. Close attention should sewage water level in the furnace, each sewage water level in the boiler to reduce the 25 to 50 mm is appropriate. ② if not through to the sewage outfall end of the tank or sewage well, and no protective equipment must be available in the sewage do know that no one is near the outfall place to avoid accidents when sewage. ③ particular sewage operation is as follows: two with each boiler blowdown valve, the first (the one away from the boiler) when only the second full discharge, then only slightly open first drain valve (latest one from boiler) to preheat the pipe until the pipe gradually turn up after preheating only a first drain valve, the sewage must be completed first gradually turn down the drain valve, shut off and then only the second drain valve, the purpose of doing so is to use only the first discharge, when leakage to keep only the first, only the second control emissions can still be used. When sewage if there is impact noise in the sewage, that is only the first drain valve should be closed until the small impact sound disappears, then slowly turn up the sewage should not be carried out continuously, so as not to affect the water cycle. ④ After the completion of the sewage close the drain valve, the drain valve is tight check, check is: closing the first drain valve only after some time, the second test only touch on the drain valve conduit hand, if the cooling blowdown there must be leaking valve.
When the salt content of boiler water is increased to a certain extent, both of these two factors will make the effect of steam separation worse, and a large amount of steam carries water, resulting in a sharp increase of steam salt content.
Air scaling coefficient α (not on predetermined criteria)? A: According to GB / T16157-1996 "emissions from stationary sources of particulate matter and gaseous pollutants measured sampling methods", SO2 emission concentration of boiler should be converted into the measured excess air coefficient α = 1.8 at a concentration of emission.
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