The convection pipe is the convection heating surface of the gas boiler, which is used to absorb the heat of the high temperature flue gas and increase the heating area of the boiler. The performance effect of the convection tube bundle - endothermic, is related to the flue flow rate, the arrangement of the tubes, the way the flue gas is flushed, and is one of the most important components of the gas boiler.
The water wall tube is laid on the inner wall surface of the furnace, and is mainly used for absorbing the flame in the furnace and the radiant heat emitted by the high temperature flue gas, and has the function of cooling and protecting the furnace wall.
First, the cause of blasting water wall tube blasting
1. The material is unqualified and the installation does not meet the requirements of the specification. If the pipe wall is stratified, the weld quality does not meet the grade requirements, and there are remnants in the pipe. Causes the tube wall to be partially overheated and burned out.
2. The quality of the feed water does not meet the standard requirements, causing fouling of the pipe wall structure and affecting heat transfer. Causes the tube wall temperature to overheat and blast.
3. The fly ash is seriously worn, and the thickness of the pipe wall is reduced.
4. The fire rises too fast or the furnace is stopped too fast, and the tube is unevenly heated and the weld is broken.
5. Boiler explosion may occur due to excessive boiler load, uneven combustion and serious coking outside the pipe.
Second, prevent explosion control measures
l. Before the installation, the pipe should be strictly re-examined, and the welding must have a welding procedure guide, and the welding quality meets the design requirements. After the pipeline is installed, pass the ball through the ball to ensure that the pass rate reaches 100%.
2. Strengthen water quality management, soften water once per shift and meet water quality standards, regularly check scale content and eliminate it, and regularly discharge pollutants.
3. The water wall tube and the convection tube should be inspected regularly. It is found that the tube with deformation or thinning should be replaced in time. At the same time, attention should be paid to the quality of the inspection, which must meet the requirements of the specification.
4. The boiler should not be overloaded (specified limit), pay attention to the combustion process in the furnace, and ensure that the combustion is uniform and stable.
5, pay attention to the pipe coking situation, to achieve timely focus and pay attention to leakage.
