The energy-saving effect of pulverized coal industrial boiler is remarkable
The present situation of coal-fired industrial boilers in China is not optimistic. First, the pollution is very serious. The data show that in 20 10, China's industrial boilers discharged about 100000 tons of sulfur dioxide, about 2 million tons of nitrogen oxides, about100000 tons of dust and about 90 million tons of waste residue, making it the second largest dust pollution source in China after coal-fired power generation. However, more than 85% of the total number and capacity of industrial boilers in China are coal-fired industrial boilers. Secondly, the operation efficiency is low. The design efficiency of coal-fired industrial boilers in China is generally 72%~80%, and the actual operation efficiency is mostly 60%~65%, which is lower than the international level 15~20 percentage points.
The "Twelfth Five-Year Plan" energy saving and emission reduction target points out that by 20 15, the energy consumption per 10,000 yuan of GDP will be reduced to 0.869 tons of standard coal (calculated at 2005 prices), compared with 20 10/0.034 tons of standard coal and1.273 tons in 2005. If the overall thermal efficiency of industrial boilers is increased from 65% to 80%, more than 65438+300 million tons of coal can be saved every year. Han, director of the Energy Research Institute of the National Development and Reform Commission, told China United Business Daily that industrial boilers have great energy-saving potential. Under this background, the energy-saving problem of new pulverized coal industrial boiler is highlighted. Du Minghua, an expert in the field of advanced energy technology in the 863 Program of the Ministry of Science and Technology, said that pulverized coal particles are uniform and suspended in the air. Compared with stratified combustion, the combustion-supporting air ratio is low, the burnout rate is high, and the heat loss of flue gas emission is small; The pulverized coal industrial boiler adopts fully enclosed powder feeding, air supply and ash discharge technology, which has good thermal insulation performance, greatly reduces the heat loss caused by hot air and flue gas leakage, and is conducive to improving the thermal efficiency of the boiler; Traditional industrial boilers (such as chain boilers) use slow burning and slow stewing under intermittent load, resulting in fuel waste. The pulverized coal industrial boiler can be started and stopped immediately, reducing the fuel loss during standing. According to preliminary calculation, if all the existing coal-fired industrial boilers are upgraded with pulverized coal boiler technology, about 200 million tons of coal can be saved every year, and at the same time, about 3 million tons of sulfur dioxide, 300,000 tons of dust, 30 million tons of waste residue and 500 million tons of carbon dioxide can be reduced every year, which is expected to greatly improve urban air quality.
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Since the effect of energy saving and emission reduction of pulverized coal industrial boilers is so remarkable, does this technology have investment value and market promotion prospects? Sun, assistant director of the Energy Conservation Service Industry Committee of China Energy Conservation Association, calculated an account: if it runs 200 days a year and 20 hours a day, the operating cost of the new pulverized coal industrial boiler is about 6.5438+0.7 million yuan less than that of the chain boiler, of which about 89% is the fuel cost reduction value. The longer the running days and the daily running time, the greater the difference in running costs. Sun said that the construction cost of a new 7MW pulverized coal industrial boiler is about100 ~1500,000 yuan higher than that of a traditional chain industrial boiler, but the difference can be recovered after running for about one year. It takes about 3-3.5 million yuan to transform a layer-fired boiler into a new type of pulverized coal industrial boiler with 7MW, and it takes about two years to recover the transformation cost. In addition, in order to effectively reduce the pollution emissions of coal-fired industrial boilers, improve the operating efficiency of boilers, and guide the healthy and orderly development of coal-fired industrial boilers, the state has also issued a series of plans and policies, all of which put forward requirements for improving the energy efficiency and pollutant control of industrial boilers, such as the Outline of the National Medium-and Long-Term Science and Technology Development Plan (2006-2020), the Medium-and Long-Term Special Plan for Energy Conservation, and the Regional Improvement on Promoting Joint Prevention and Control of Air Pollution. The new technology of high-efficiency pulverized coal industrial boiler has produced and installed10.2 million tons of steaming equipment in Shanxi, Xinjiang, Ningxia, Inner Mongolia, Yunnan and other places, and more than 8,000 tons of steaming equipment have been put into operation. It mainly involves two categories: building heating and steam for industrial production.
High-efficiency pulverized coal industrial boiler system is a high-tech product with independent intellectual property rights after several years of independent research and development with the support of National Science and Technology Research Institute, National Science and Technology Support Plan, 863 Plan, Beijing Science and Technology Plan and Science and Technology Innovation Fund of Coal Research Institute. This product conforms to the urgent situation of energy saving and emission reduction and the policy orientation of the country. It is an upgraded product of traditional coal-fired industrial boilers and an ideal substitute for oil-fired and gas-fired boilers. Its birth has injected new vitality into traditional coal-fired industrial boilers and provided new development opportunities.
This technology has five characteristics: remarkable energy-saving effect, high level of pollutant emission control, friendly working environment, simple operation and low operating cost, which truly realizes energy saving and emission reduction of industrial boilers. The new high-efficiency pulverized coal industrial boiler technology can make the combustion rate of coal reach above 98%, the thermal efficiency of the boiler exceed 90%, and save coal by more than 30% compared with the traditional coal-fired boiler. Compared with ordinary coal-fired boiler technology, the new high-efficiency pulverized coal industrial boiler technology can save more than 20% of fuel costs every year, and compared with oil-fired boiler technology, it can save more than 70% of fuel costs. The emission of TSP from the new high-efficiency pulverized coal industrial boiler is less than 20 mg/Nm3 (national standard is 100 mg/Nm3), and the emission of SO2 is less than 500 mg/Nm3 (national standard is 900 mg/Nm3). After identification, all technical indicators have reached the international advanced level. Recently, the Ministry of Science and Technology has regarded this technology as one of the key technologies for energy conservation and emission reduction, and included it in the key projects of the national "Eleventh Five-Year" science and technology support plan. It is planned to further demonstrate in some cities in China during the Eleventh Five-Year Plan period, expand the scope of demonstration, develop serialized products and carry out standardized operations.
According to industry insiders, high-efficiency pulverized coal boiler technology is a high-efficiency energy-saving and emission-reduction boiler technology successfully developed in China in recent years, with independent intellectual property rights and reaching the international leading level. At present, the technology is mature, economical and easy to operate. Popularizing pulverized coal boilers is the best policy to improve the level of energy saving and emission reduction during the Twelfth Five-Year Plan period.