Gas-solid dual-fired boiler technology into the industry efficient desulfurization, denitrification

Coal-fired boiler raw material supply conditions are available, but the desulfurization and denitrification coal combustion is difficult, high emissions; gas-fired boiler pollution is small, but the price is high, and our energy distribution in most places "coal to gas" becomes unrealistic, How to choose between coal and gas? At the beginning of the year, the smog that lasted for many days aroused public alarm. When many provinces and autonomous regions determined to operate "coal-fired" boilers, they still could not evade this environmental and cost-based problem.

When gas-solid dual-fuel technology enters the industrialized production stage, this dilemma is expected to obtain new solutions. Gas-solid dual-fuel boilers can adapt to gas, solid and gas-solid mixture of three different fuels, burners allow burner burn rate of 98% or more, energy-saving emission reduction effect is significant. Produced by Shanxi Lantian Environmental Protection Co., Ltd., the thermal efficiency of gas-solid dual-fired furnaces operating in Weifang, Shandong reached over 90% and the emission targets were fully qualified. Gas-solid dual-combustion technology for its industrialization in the country a wider range of preparation for the promotion of conditions.

A wide range of gas to replace coal is unrealistic

Coal is considered the number one source of pollution that affects our air quality. Last year, China totally burned 4 billion tons of coal and used 200 million tons of fuel for transportation. The sulfur content of coal is about 1% to 2%, and the sulfur content of Euro â…¢ standard oil is 150ppm (0.015%).

The report jointly released by China Center for Disease Control and Prevention and International Environmental Protection Organization also pointed out that the pollution caused by coal burning accounts for 70% of China's soot emissions, 85% of sulfur dioxide emissions, 67% of nitrogen oxide emissions and 80% of carbon dioxide emissions. At the same time, the spread of coal-fired pollutants can reach thousands of kilometers, equivalent to Beijing to Shanghai, and even Beijing to Guangzhou.

Coal-fired boilers have inherent illnesses, then not burn coal? Boiler combustion natural gas thermal efficiency is higher, and the pollutant emission concentration is lower. In order to alleviate the air pollution caused by coal-fired emissions, large-scale cities represented by Beijing have been accelerating the city's "coal to gas" project in recent years and gradually realizing the "no coalification" in urban areas.

But the problem followed. Most of the fuel used in gas-fired boilers is natural gas, and the distribution of natural gas in our country is uneven. Where the distribution of natural gas is small, the cost of gas-fired boilers is high, and the promotion of heating in enterprises and communities is not good, and the dependence on gas sources is strong. Explosion, gas pressure instability, higher operating costs and other issues.

At the same time, China's consumption of natural gas is also gradually increasing. It is understood that in 2012, China's apparent consumption of natural gas reached 147.5 billion cubic meters, an increase of 12.9%. China's total natural gas reserves are not rich, if we continue to increase the total amount of natural gas imports, will fall into the over-import of energy security crisis.

Based on China's energy status quo, it is unrealistic to replace all coal-fired boilers with gas boilers.

Gas-solid dual-fuel boilers with economy, adaptability, a wide range of popular soon

When the boiler reform encountered the choice of coal and gas difficult, gas-solid dual-fired boiler to meet the actual needs. At present, China's coal-fired industrial boiler in the traditional chain furnace accounted for more than 85%. Chained furnace because of broken coal combustion, uneven particle size, high air excess coefficient, large coal combustion is not complete, not only low thermal efficiency of the boiler, and exhaust emissions difficult to achieve the standard. Gas-solid dual-fuel technology includes the removal of multi-stage pollutants such as "coal quality control and pollutant removal", "desulfurization in low-nitrogen combustion and combustion," "dust remover and desulfurization," and "integrated tail pollutant removal device" Technology, to a greater extent to meet the dust, sulfur dioxide, nitrogen oxides, mercury and other pollutants removal.

Gas-solid dual-fuel boiler fuel can either gas, solid fuel alone do fuel, but also gas, solid fuel by a certain percentage of mixed combustion. In the absence of gas, gas-solid dual-fuel boilers can pulverized coal fuel, compared with the traditional boiler, saving more than 30%, the pollutant emission reduction effect close to the gas; and when the gas supply conditions or need to meet the higher environmental standards Gas-solid dual-fuel boilers can use gas as fuel. When the gas-solid fuel is mixed according to a certain proportion, it still has good energy-saving and emission reduction effects.

In Shanxi, a coal-fired province, the technology of gas-solid twin-fuel boilers is maturing and the promotion of industrialization is imminent. Lang Feng'e, chairman of Shanxi Blue Sky Environmental Protection Group, said in an interview with reporters: "At present, the gas-solid dual-fuel boilers have started to popularize and applied in Xinjiang and Liaoning provinces and achieved good energy-saving and emission-reduction benefits." Next, Boilers will strive to promote a wider range in the country. "

From the application of practice, in 2012, Shandong Weifang Yixing Chemical newly built 100,000 tons of sec-butyl acetate project, the choice of the Blue Sky Environmental Group 35t / h and 75t / h gas-solid dual-fired boiler. The boiler system with low olefin - high octane liquefied petroleum gas (sec-butyl acetate by-product) and pulverized coal as a fuel, according to the production of gas-solid fuel to achieve different proportions of mixed combustion. At the end of last year, tested by relevant departments, the boiler thermal efficiency of 92% when the boiler room is operating normally can control the concentration of sulfur dioxide in the flue gas below 100 mg / m3. In the case of no tail denitration device, nitrogen oxide The discharge concentration of the substance is controlled below 200 mg / m3, the removal rate of PM2.5 can reach over 99%, and the dust emission can be controlled below 30 mg / m3, effectively controlling the pollutant discharge and fully complying with the national and local requirements Energy-saving environmental standards.

Local governments are turning to "coal-burning" and their determination to control smog is on the rise. Recently, Zhengzhou, Henan Province, said to the outside that by the end of next year, all 263 urban coal-fired boilers completed the demolition and transformation. At the same time, Xi'an announced the implementation plan of "pollution control and haze reduction" and plans to complete 450 coal-fired boiler reconstruction tasks this year. Some of the units still in need of boilers will switch to high combustion efficiency and better emission reduction New boiler.

In many places set off a wave of governance when the haze, gas-solid dual-fired boilers to meet national and local environmental standards at the time, because of its high economy and more general adaptability, significant economic and environmental benefits for the country Governance haze to explore the system solutions.

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