Definition of Boiler Efficiency is “The percentage of the total absorption heating value of outlet steam in the total supply heating value.” In other word, it is a rate how the boiler runs efficiently. The thermal efficiency of our coal-fired boilers is 84~92%, the efficiency of fuel and gas boilers is 96~99%, and the efficiency of biomass boilers is 86-93%. The higher the efficiency of the boiler, the better the heat transfer performance. Increasing boiler thermal efficiency can reduce boiler fuel consumption and reduce boiler operating costs. Increasing the thermal efficiency of the boiler is to increase the effective use of heat and reduce the heat loss of the boiler. The key point is to reduce the heat loss of the boiler exhaust gas and the loss of mechanical incomplete combustion.
Industrial boiler market share rise, to the current trend of energy-saving industry, industrial boilers are mainly used in metallurgy, chemicals, coke, cement, paper, shipbuilding and other industries, mainly through heating boiler, steam production unit each to provide the required or hot water. Different transformation and power industry, industrial boilers since often small cell capacity, installed at the rear end of expensive desulphurization and denitrification apparatus is very uneconomical, so the transformation of coal will be the main alternative route, the coal gas, biomass fuels, cleaning three coal technology route, clean coal will assume the main task. By the end of 2011, the total industrial boilers reach 58.5-60 million units, of which the boiler, the capacity accounted for more than 80% of coal-fired boilers, boiler capacity is less than the number of 35 tons / hour of 96% of the total, while 10 accounting tons / hour up to 80%. Meanwhile, the average thermal efficiency of industrial boilers only 60%, 20-25% lower than in other countries. The country's industrial kilns more than 160,000, concentrated in building materials, metallurgy, chemicals and ceramics and other industries, the annual coal consumption of 300 million tons. The average heating furnace thermal efficiency of only 40%, 10-30% lower than in other countries. A wide range of large industrial boilers in China, the average capacity of small and dominated by coal. Although China's coal-fired industrial boiler design productivity gap compared with foreign small, but the actual operating efficiency of only 65%, 10% -15% lower than the advanced level. Industrial boilers with maximum downstream chemical materials and chemical products manufacturing market size, non-ferrous metal smelting and rolling processing industry, petrochemical industry market size is large, in addition, the market size paper and shipbuilding industries is relatively small, moderate growth in the cement manufacturing industry . Overall, the future of Chinese boiler market demand is still the main metallurgy, chemical and petrochemical three coking industry, and paper, cement and other industries demand is relatively weak, shipbuilding recession has not slowed. Industrial boilers, especially coal-fired industrial boilers for energy saving is important for achieving the overall goal of energy conservation.
The need for paper industry paper industry conversion of coal-fired boilers to gas boiler is a boiler equipment industry needs is more important, because a lot of links to the papermaking process requires a lot of steam drying, stereotypes and so on. However, along with the national policy of environmental protection departments to ban coal-fired boilers, and now more and more manufacturers have to use coal-fired boilers to coal-fired boilers upgrading or purchasing a new low - NOx emissions. Paper mill boilers from coal to gas fired boiler is an important direction of current reform, is one more type of enterprise transformation, especially in the area more natural gas, coal into gas boiler is the main way. 1, in order to transform mechanization layered fired boiler gas boiler, you should first remove the front arch and a rear arch, while increasing the bottom heating surface, instead grate, grate to prevent overheating, combustion; 2, through the furnace heat transfer calculation methods determining the size of the boiler, furnace flame center position, and then pouring furnace work. In order to avoid the center position after arch boiler tubes, based on the original slope of the original arch made pipe. 3, the furnace in order to prevent an explosion, when the coal-fired boiler furnace gas is substituted, or when fuel not atomized combustion gases in the furnace incomplete combustion or heating surface of the end of the furnace, a fire or explosion occurs, should be mounting the appropriate parts of the boiler explosion vent, and to increase the ignition and flame failure protection program control to automatic control means, to ensure safe operation of the boiler. 4, is closely related to the selection and arrangement of the burner and furnace, the filling degree of the flame in the furnace should preferably not to form a dead air. Gas burner arrangement considered reasonable and piping layout, easy operation, maintenance and inspection.
Two of the country this year, the NLD Central Democratic National Construction Association Central and made a number of proposals, to speed up the clean and efficient use of coal mine environmental governance has become a hot topic.
NLD central in the proposal pointed out that China's energy structure adjustment should take Duocuobingju way, multi-pronged approach in phasing suppress excessive coal consumption, promote clean and efficient use of coal, etc., it is necessary to focus on environmental protection, but also to resolve the coal system pressure generated by the financial industry, but also pay attention to the industry employment situation of people's livelihood and social stability.
National Bureau of Statistics recently revealed that total energy consumption in 2018, 4.64 billion tons of standard coal, up 3.3 percent over the previous year, of which coal consumption increased by 1.0%. According to statistics, China's coal demand had reached 4.24 billion tons high point in 2013. From 2014 to 2016, coal consumption declined for three consecutive years, from 2017 to 2018 and began to grow, demand for electricity is the most important factor in the growth of coal consumption in our country return to growth.
NLD central in the proposal put forward, to change the traditional extensive coal utilization, promote clean and efficient use is an inevitable choice to realize energy structure adjustment "soft landing". As most of the early years of huge capital investment in the coal industry to achieve through bank credit, the current coal production capacity is still excess capacity, low coal prices, in this case, it should gradually promote the adjustment of energy structure through technology, etc., should not too quickly, leading to financial system pressure increases, the pressure to raise employment and livelihood.
Proposals suggest that the development of coal-based regional energy center, to achieve energy efficiency an "electricity, gas, cold, heat, water" comprehensive energy plan overall, a substantial increase in thermoelectric projects. Forced to upgrade enterprise technology through carbon taxes and sewage charges, increase the proportion of clean energy use. Regional Center for Alternative Energy Development dispersed small boilers. Accelerate the development of clean coal conversion industry, the direct liquefaction of coal, industrialization indirect coal liquefaction, coal gas, coal, ethylene glycol and other technologies to increase support development efforts.
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