In recent years, Hebei Province People's Government to respond positively to Blue Sky Battle action plan promulgated by the state, and all of 35t / h coal-fired boiler and below in the Hebei province out of the transformation process. First Hospital of Baoding respond positively to the call of the provincial government, eliminate serious pollution of the original coal-fired boiler hospital, citing energy saving hot sell industrial steam boiler to natural gas as raw material. After a series of market research, WNS Series Split hospital condensing gas boiler boiler other fast soft spot.
Seen in this light, the 2020 coal-fired boilers would be no grant funds, and for the enterprise, environmental protection boiler as soon as possible to switch to Fuji's rapid and healthy development of enterprises is selected. So, still waiting to see friends, to step up the action.
The method of prolonging the life of electric hot water boiler hearthCast iron cooling stave is the first choice for prolonging the life of electric hot water boiler hearth. In recent years, copper cooling stave has an increasing trend, but practice shows that cast iron cooling stave and copper cooling wall are adopted when the thickness of refractory material is sufficient. The temperature change of the hot surface of the refractory material is not obvious. At present, 20 years or more service life of blast furnace at home and abroad, electric hot water boiler hearth is realized by cast iron cooling stave. This shows that the cast iron cooling stave can meet the service life requirement of 20 years or more. It can be seen that the copper cooling stave has little benefit, but the cost is greatly increased. Therefore, the electric boiler recommends the furnace hearth to choose the cast iron cooling stave. 2, cooling The water pipe should be set under the bottom of the furnace: the bottom of the electric hot water boiler is not suitable for excessive cooling, and the excessive cooling is not conducive to the formation of the bottom erosion of the pot, which will aggravate the tendency of the hearth's elephant foot erosion. The practice shows that if the cooling pipe is placed on the bottom of the furnace, there will be more obvious elephant foot erosion on the bottom of the furnace, but it is better to set the cooling pipe under the bottom of the furnace. Only by adopting appropriate cooling intensity on the bottom of the furnace to promote the formation of reasonable bottom-like erosion of the boiler can the corrosion tendency of the hearth's elephant feet be alleviated and the life of the hearth can be prolonged. 3, deepen the depth of the dead iron layer: the United Kingdom, Japan, Germany and other countries, according to their blast furnace use, all proposed to add the dead iron layer Deep to more than 25%, it is beneficial to improve the life of electric hot water boiler hearth. Increasing the dead iron layer has more effect on delaying the circulation erosion of the furnace hearth of the electric hot water boiler than the penetration erosion of hot metal. Therefore, deepening the dead iron layer will increase the erosion area of the hearth, but the weakening of the circulation will delay the erosion speed in the direction of the thickness of the furnace wall. It's good for a long life. 4, thinner hearth refractory configuration: electric hot water boiler hearth refractory configuration must be aimed at forming stable slag-iron solidifying layer, blast furnace hearth longevity has been proved by practice. No matter how high-quality carbon bricks and thickness of furnace walls are used, it is impossible to match the mechanical and chemical properties of hearth slag iron. When erosion is counterbalanced, it will be quickly eroded. Only by forming a stable slag-iron solidifying layer can the hearth achieve a long life. In the design, the hot surface temperature of the carbon brick should be lowered by the effective heat transfer system of the furnace wall, so that the hot surface of the carbon brick can form a stable slag-iron solidifying layer, and the slag-iron solidifying layer should be used to resist the erosion of hot metal in the hearth and various kinds of machinery so as to realize the longevity of the hearth. In the hearth heat transfer system, the thermal resistance of the carbon brick is the largest, reaching 48%. The heat transfer capacity of the carbon brick wall is very important to the formation of the slag skin of the hearth. From this point of view, the hearth material is too thick, especially the brick lining in the iron section is thickened to 1.9 meters, and the section of the hearth is changed from circular to circular. As a square, this thickening method is harmful. The calculation of cooling heat transfer shows that the thickness of carbon brick lining should not be more than 1 meter. It is very beneficial to apply the thin hearth refractory configuration, to bake the protective carbon brick before opening, and to spray the protective layer with good performance within 1 layer of 100mm in the hearth.
The change of boiler water level can make steam pressure unstable, even full water or lack of water accident. Therefore, in order to keep the water level fluctuating slightly near the normal water level, the boiler should supply water evenly and continuously as far as possible in order to keep the water level fluctuating slightly near the normal water level. If low water level appears, the combustion should be controlled immediately. All kinds of boilers with different structures have prescribed the minimum safe water level, which must be maintained above the minimum water level limit in the operation of the boiler. The above is manual regulation, small-sized fuel-fired gas-fired boilers are generally automatic regulation.
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