Fangkuai price 20t boiler uzbekistan for you to sort out 30 boiler operation common problems and solutions, after learning, do not forget to share with your friends oh. 1, why chemical cleaning of newly installed and overhauled boilers? In the process of manufacture, transportation, installation and maintenance of boiler, it is inevitable that some impurities such as dirt, iron chips, welding slag, iron oxide and so on will be produced and glued to the pressure parts of the steam and water system in the process of manufacture, transportation, installation and maintenance. As soon as these impurities enter the steam-water system in operation, they will do great harm to the boilers and steam turbines. Therefore, the boilers before they are installed and overhauled must be chemically cleaned to remove them. 2. What are the rules for the time and temperature of water supply before boiler start-up? Why? The inlet speed of boiler before start-up should not be too fast, usually no less than 4 hours in winter, 2-3 hours in other seasons, especially in the initial stage of water intake. The inlet water temperature of a cold boiler is generally at 50 ℃ 90 ℃, so that the difference between the feed water temperature entering the drum and the wall temperature of the drum is less than 40 ℃. The inlet water temperature of the uncooled boiler can be compared with the drum wall temperature, and the general difference should be controlled within 40 ℃, otherwise the inlet water speed should be slowed down. The main reasons are as follows: (1) because the drum wall is thicker and the expansion is slow, the tube wall connected to the drum wall is thinner and the expansion is faster. If the inlet temperature is too high or the inlet speed is too fast, it will cause unevenness of expansion, crack of welding joint and damage of equipment. (2) when the feed water enters the drum, it always contacts the lower wall of the drum first. If the difference between the feed water temperature and the drum wall temperature is too large, the speed of entering water is fast, the upper and lower walls of the drum and the inner and outer walls will produce a larger expansion difference. Cause large additional stress to steam drum, cause steam drum deformation, produce crack 3 when serious, how does the low temperature corrosion of tail heated surface produce? Formation of SO2,SO2 from sulfur Combustion in fuel combined with oxygen in flue Gas to form SO3, when the temperature of the heating surface is lower than the dew point of the flue gas The steam in flue gas is combined with SO3 to form sulphuric acid steam, which condenses on the heated surface and results in low temperature corrosion of the heated surface. The cold end of air preheater is prone to low temperature corrosion. 4, when the emergency shutdown? (1) when the drum water level exceeds the limit. (2) when all water level gauges of the boiler are damaged. (3) explosion of superheated steam pipeline, reheated steam pipeline and main water supply pipeline. (4) when reburning occurs at the end of the boiler. (5) all suction, fan and air preheater stop operation. (6) when reheating steam is interrupted. (7) Boiler pressure rises to safe door operating pressure, and all When the safety door refuses to move. (8) when an explosion occurs in the furnace or in the flue causing serious damage to the equipment. (9) when a boiler extinguishes a fire. (10) when a fire breaks out in the boiler room, it will directly affect the safe operation of the boiler. (11) when the furnace tube blasting cannot maintain the normal water level of the drum. (12) when all operator stations are blackscreen or crash at the same time and the main parameters are out of control. 5, how do I flush the drum water level meter? There are three processes for flushing the water level gauge: water side flushing: opening the drain gate, closing the steam side door, opening the water side door; steam side flushing: opening the discharge door, closing the water side door, opening the steam side door; Open the discharge door, open the steam side door, open the water side door. Rinse and close the drain door.
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Hot water price 20t boiler uzbekistan does not use softened water What are the hazards? In hot water boiler, if not need to have softened, then what would be the tail number, this furnace in terms of this? Or need to bring this problem, the reason is very simple, because the bottom will be for this problem to carry out the actual discussion, easy and everybody can clearly figure out, do not leave all doubts. Hot water boiler, which does not use softened water was then damage to the furnace, resulting in adverse effects in other words, the key is following this, it actually is: a hurt: if fuel savings, hot water boilers do not use softened water was then prone to fouling its internal situation, thereby promoting the thermal conductivity of the furnace heating surface is reduced, calories can not carry out the transfer immediately, only to be brought smoke. Thus, the willingness to ensure the heat is worth, then, is bound to fuel more investment material. Thus, leading to savings in fuel. Damage to two: furnace heating surface damage, even if is destroyed, the furnace soot and hot water boilers, then rises in temperature, it will make the temperature difference between both sides of the heating surface increases, which for the heating surface, it is a is not good. If, there is pressure within the furnace was then, the wall thickness is from the package there will be even split. Thus, the heating causes surface damage. Damage to three: reduce the furnace output in hot water boiler, because there is no application of demineralized water, it will cause fouling problems, and saving on fuel. This is for the furnace output, is a very bad influence, it will be due to the decrease. Therefore, this is one must pay attention to the region. Injury four: If priming, the water in the heating furnace with more sodium chloride, sodium phosphate, lubricating oils and silicide, or the water is an organic compound and a base to produce the saponification reaction to give, then, when the furnace water to a boil volatile, its level will appear at the end of the bubble, thereby creating a priming this situation problem. Hurt five: the destruction of the water cycle for the furnace water heating furnace, in which the amount through the bad, must be balanced. If you have a furnace fouling situation was, then make the water vapor pressure to expand. Further, no problem of damaging any water through the bad, and causes the alloy wall temperature. What's more, prone to burst pipes condition, immediately to the Security Council threaten the operation of the furnace.
In the price 20t boiler uzbekistan, the exhaust temperature is between 160 ℃ and 250 ℃, and the steam in the flue gas is still in the overheated state. It is impossible to condense into liquid water and give out the latent heat of vaporization. It is well known that the boiler thermal efficiency is calculated by the fuel low calorific value without considering the heat loss of vaporization latent heat in the fuel high calorific value. As a result, the thermal efficiency of conventional boilers can only reach 87% / 91%. The condensing waste heat recovery boiler reduces the exhaust temperature to 50 ℃ and 70 ℃, which fully reclaims the sensible heat in flue gas and the latent heat of condensation of water vapor. Recovery of steam volume in boiler flue gas by condensing waste heat using natural gas as fuel At 15%-19%, the steam content in the flue gas of the oil-fired boiler is 10%-12%, which is much higher than that in the flue gas of the coal-fired boiler, which is less than 6%. At present, the boiler thermal efficiency is calculated by low-level heat generation. Although nominal thermal efficiency is high, because of the high natural gas, the difference of low-level heat-generating value is about 10%, the actual energy utilization rate still needs to be improved. In order to make full use of energy, reduce the exhaust temperature and recover the physical heat energy of flue gas, when the wall temperature of the heat exchanger is lower than the dew point temperature of the flue gas, the steam in the flue gas will be condensed and the latent heat will be released. 10% of the high and low calorific difference can be used effectively.