When the gas-fired hot water boiler is running, the water in the boiler can easily cause the boiler water to vaporize if it is not paid attention to during the abnormal operation and stop of the circulating pump. It may cause "air blockage" in the hot water circulation network, or it may cause burning or pipe explosion of the boiler heating surface, and in serious cases, it may cause malignant boiler explosion accidents. Therefore, vaporization of hot water boilers must be prevented.
The local vaporization in the gas-fired hot water boiler is mainly guaranteed from the structural design to ensure the reliable water circulation of the boiler. When the hot water boiler is pressurized and vaporized due to sudden pump shutdown, power failure or problems in the whole hot water circulation system, the generated steam can not affect the circulation of the hot water system and discharge the steam in time. Usually, the steam collecting tank is set at the top of the boiler, the upper header of the economizer and the high point of the hot water pipeline.
When the pump is suddenly stopped and the power is cut off, the boiler blows and the induced draft fan stops working. At this time, the furnace door should be opened immediately to reduce the combustion and reduce the furnace temperature. At the same time, the valve should be closed, and then the exhaust valve on the gas collector can be opened slowly, and cold water can be introduced into the boiler. In this way, whoever will be discharged through the hot water boiler and gas collector to avoid boiler water vaporization.
During normal operation, if it is found that the outlet water temperature of the boiler is higher than the normal temperature or the pressure increases, the boiler water may vaporize and the hot water circulation system may be blocked. At this time, it is also necessary to exhaust through the gas collector.