Online low-nitrogen oxygen-rich combined combustion energy-saving system

Abstract

The invention discloses an online low-nitrogen oxygen-rich combined combustion energy-saving system. The system comprises a pretreatment comprehensive coal hopper which is mounted on a chain-type coal firing boiler, feeds the raw coal in layers and in rows into a chain-type coal firing boiler grate and sorting powdery coal on line; a drying / preheating heat exchanger for drying and delivering the powdery coal which is sorted by the pretreatment comprehensive coal hopper and preheating the air; a coal powder fine-sorting device connected with the drying / preheating heat exchanger and used for finely sorting the powdery coal which is dried by the drying / preheating heat exchanger; and a low-nitrogen oxygen-rich coal powder combustor used for feeding the high-quality coal powder which is finelysorted by the coal powder fine-sorting device into the chain-type coal firing boiler grate. The online low-nitrogen oxygen-rich combined combustion energy-saving system has the advantages of simple structure, reasonable design and good use effect; can treat inferior coal on line to obtain the energy-saving modification technique with the optimum use effect while minimizing the minimum cost, can increase the utilization efficiency of inferior coal, reduce the waste of energy and reduce the use cost.

Description

technical field [0001] The invention relates to an energy-saving combustion system, in particular to an on-line low-nitrogen and oxygen-enriched composite combustion energy-saving system. Background technique [0002] Raw coal is one of the main energy sources in China. At present, China consumes about 3.3 billion tons of raw coal annually, and it still maintains an annual growth rate of 1%. Such a large use of raw coal has reduced the amount of raw coal (steam coal) suitable for direct combustion year by year. According to statistics, steam coal accounts for about 1 / 3 of China's total coal reserves, and low-quality coal (including coal gangue) accounts for about 2 / 3. For this reason, in order to maintain the continuous use of coal resources and ensure the sustainable development of the national economy, it is necessary to have a good low-quality coal combustion system. [0003] In recent years, clean coal technology has been mainly advocated, but clean coal technology has ...

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Problems solved by technology

However, the existing composite combustion technology cannot achieve online sorting of raw coal, online preheating, drying and grinding treatment, and online pulverization and transportation of pulverized coal combustion, which increases fuel costs and operating costs, and cannot solve energy conservation, environmental protection, and overall costs. the contradiction between

[0006] In addition, at present, the state also strongly supports the development of pithead power stations that can use coal gangue as a fluidized bed coal-fired boiler to deal with this situation. However, a large number of industrial boilers and power boilers around cities in active service cannot be completely replaced in the short term The cycle takes at least 20 years

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