Above or from the energy saving electric boiler above are superior from an environmental ordinary boiler is a boiler capable of utilizing coal, oil, gas, electricity can be transmitted to the chemical medium, the pressure vessel is converted to thermal energy or mechanical energy, and the heating powered has a wide range of applications, electric boilers for industrial production is the common type. Electric boiler fuel can be utilized to heat the water to a certain temperature, or for heating domestic hot water. Since the fuel gas and the like require 13 5 mw fired hot water boiler fuel and the fuel would have a certain amount of combustion exhaust gas, while improving the thermal efficiency of the boiler, the boiler to reduce pollution is an important issue. Condensing hot water boiler as a new hot water boiler, whether in the use of heat, or in the above exhaust emissions which are due to the performance of the conventional type boiler. Then condensing boiler and hot water boiler ordinary What is the difference? Analysis of the higher exhaust gas temperatures up ordinary boiler, generally up to 150 deg.] C, while the flue gas emissions, can take away a lot of heat from the heat utilization. Natural gas fuel used in the gas boiler containing a large amount of hydrogen element, after burning will produce large amounts of water vapor, the water vapor discharged with the flue gas while the outward, it is possible to take a lot of latent heat of vaporization. Condensing hot water boiler flue gas temperature below 40 ℃, not only the sensible heat of flue gas can be absorbed, but also at low temperature, the water gas generated by the combustion will be present in liquid form, which absorbs the latent heat in the flue gas. Up from the ordinary exhaust emission analysis using atmospheric gas hot water boiler combustion mode, which will result in excess air ratio in the mixed gas is too large, the flame temperature will produce thousands of degrees the boiler during operation, nitrogen at high temperature It will react with oxygen to generate nitrogen oxides, and nitrogen oxide emissions is an important cause of air pollution. Condensing boiler water premix burner, it will fuel and air mix before ignition combustion, which reduces the amount of excess air in the mixed gas, thereby reducing the generation of nitrogen oxides, the boiler improves environmental performance. In summary, condensing hot water boiler either from above or from the energy-saving and environmental protection above all better than ordinary boilers.
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Gas 13 5 mw fired hot water boiler promote people's quality of life requirements in the real situation in China's development prospects now to improve people's living standards, family services and demand for energy is increasing. For more a lack of crude oil resources, it should be based on the gas main. In the next 10 years to 20 years, the diversification of gas hot water boiler market in China will be a great development. Next Xiaobian analyze the development prospects of gas hot water boiler in China. First, the Chinese gas market forecast. Gas hot water boiler in China's future gas market will dominate. First, China has a very rich natural gas resources; China's natural gas reserves are expected to more abundant. In the next few years of development, it estimated proved reserves of natural gas per year 1,000,000,000,000,000 m3 or more. China expects natural gas reserves of natural gas is expected to account for about 10 percent of global reserves. Second, China has three CBM resource thirty trillion m3 of fifteen trillion m3. Third, the actual consumption in China in 1997 to more than ten million tons of liquefied gas, domestic enterprises and the actual market sales of more than five million tons, the difference made up by the imports. For this purpose proposed "speed up the development and utilization of domestic resources and accelerate the use of international resources," development strategy of China. Second, the reason may be the future development of gas-fired boilers in China. (1) the development of tall buildings: since the 1980s, China's top civil cities have a larger development; In the 1990s, the increase of tall buildings faster and height are increasing. Emergence of so many high-rise buildings, its impact on the surrounding environment, the degree of automation and high reliability requirements and so to promote the use of gas hot water boiler. (2) the construction of high-tech Economic and Technological Development: Due to high standards of construction of high-tech economic and technological development, thus promoting the development of gas hot water boiler. The above is the development prospects of the most professional gas hot water boiler in China. Gas hot water boiler appeared to break the shackles of the traditional career development of boilers, boiler ushered in the cause of China in the spring. This is not only conducive to the development of gas boiler manufacturers of big events is a big influence human development, I believe the gas hot water boiler will be better in the future.
The heat loss of exhaust smoke is the largest of all kinds of heat loss in boiler. Generally, the heat loss of exhaust smoke is 6% of the heat fed into the furnace, and the heat loss of exhaust gas increases 0.5% when the temperature of exhaust gas increases by 12 ℃ and 15 ℃. So the exhaust temperature is one of the most important indicators of boiler operation. The following are several possible causes of increased flue gas temperature in the furnace: (1) slagging and ash accumulation on the heated surface. No matter it is the slag accumulation in the water-cooled wall of the furnace, or the ash deposition in the superheater, convection tube bundle, economizer and preheater, the thermal resistance of the flue gas measurement will increase, the cooling effect of the flue gas will become worse due to the deterioration of the heat transfer, and the exhaust temperature will rise. (2) excess air coefficient Big. Under normal conditions, the exhaust temperature increases with the increase of excess air coefficient at furnace outlet. After the increase of excess air coefficient, although the amount of smoke increased, the rate of smoke increased, and the convection heat increased, the increase of heat transfer was not as much as that of the increase of flue gas. It can be understood that after the increase of smoke speed, the flue gas leaves the heating surface without time to transfer heat to the working fluid. (3) the air leakage coefficient is too large. The flue gas leakage in the furnace and rear shaft of a negative pressure boiler is inevitable and the leakage coefficient allowed by a certain heating surface is specified. When the air leakage coefficient increases, the effect on the exhaust temperature is similar to that of the superheated air coefficient. And the air leaks away. The closer the furnace is, the greater the influence on the rise in exhaust temperature. (4) Water supply temperature. When the steam turbine load is too low or the high pressure heater is out of line, the feed water temperature of the boiler will be lowered. Generally speaking, if the fuel quantity is kept constant, the heat transfer temperature difference of the economizer decreases and the heat absorption of the economizer decreases when the feed water temperature is increased, which makes the exhaust temperature increase. (5) moisture in the fuel. The increase of moisture in the fuel increases the amount of smoke, thus increasing the exhaust temperature. (6) Boiler load. Although the boiler load increases proportionally, the amount of smoke, the amount of steam, the amount of water supplied, and the volume of air increase proportionally, however, the flue gas temperature at the furnace outlet increases proportionally. Increase, so that the exhaust temperature increased. After increasing the load, the outlet temperature of the furnace increases, the heat transfer temperature difference of the convection heating surface increases and the heat absorption increases. Therefore, the more the convection heating surface is, the less the influence of the boiler load on the exhaust gas temperature is. (7) fuel varieties. When the low calorific value gas is fired, the radiative heat transfer in the furnace decreases due to the decrease of furnace temperature, and the non-combustible components in low calorific value gas, mainly N _ 2, CO _ 2 and H _ 2O, increase the amount of flue gas, so the exhaust temperature increases. Although the excess air coefficient of furnace outlet is lower than that of coal burning, the ash content in the fuel oil is very low after the pulverized coal furnace is changed to burn oil, although the excess air coefficient at the furnace outlet is lower when burning oil. There is no larger ash particle in flue gas, and there is no cleaning effect of larger ash particle on the heating surface, and the convection heating surface is polluted more seriously. Therefore, combustion is not good, often smoke-emitting boiler smoke temperature rise. When there is a steel ball dust removal device at the tail, the exhaust temperature is slightly lower than that of burning coal because the tail is cleaner. (8) the operation mode of pulverizing system. For a closed pulverizing system with a silo, when the pulverizing system is in operation, as a part of the water in the fuel enters the furnace, the furnace temperature decreases and the flue gas increases, and the cold air leaking into the pulverizing system enters the furnace as a primary air during the operation of the pulverizing system. Reduction of air flow through air preheater To raise the exhaust temperature. On the contrary, when the pulverizing system is shut down, the exhaust temperature decreases.
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