Combustion system and method for burning biomass black granular fuel

Abstract

The invention discloses a combustion system and method for burning biomass black granular fuel. The combustion system comprises a raw material bin, a coal feeder and a coal mill, an outlet of denitration equipment is connected with a flue gas inlet of an air preheater, a flue gas outlet of the air preheater is sequentially connected with a dust remover and an induced draft fan, and a cold air inlet of the air preheater is connected with an air feeder and an outlet of a primary fan. A hot air outlet of the air preheater is communicated with the boiler body and the coal mill; the outlet of the primary fan is also communicated with the coal mill; and an outlet of the induced draft fan is connected with a chimney and a coal mill. Low-temperature circulating flue gas is fed into a hot air pipe to be mixed and then fed into a coal mill, unheated primary air generated by a primary air fan is also fed into the hot air pipe to be mixed, and three media of cold air, cold flue gas and hot air are mixed and fed into the coal mill to be pulverized. The temperature and oxygen concentration of the outlet of the hearth can be adjusted, the combustion condition of black particle fuel is adjusted, and the adaptability of the boiler to black particle combustion is higher.

Description

technical field [0001] The invention relates to a combustion system for burning biomass black particle fuel, which belongs to the technical field of biomass black particle fuel combustion. Background technique [0002] Coal-fired units for CO 2 Emission reduction is facing enormous pressure, and it is CO 2 One of the most effective ways. Europe is at the forefront of the world in terms of clean energy utilization and low-carbon emission reduction. As early as more than ten years ago, it began research and experiments on coal-fired coupled biomass power generation. At present, many large-scale coal-fired power plants have been converted to full-burn Or a biomass power station that burns biomass solid particle fuel. [0003] Biomass black particle fuel is an extremely high volatile content, high calorific value, ultra-low ash, ultra-low total moisture, ultra-low sulfur, low softening temperature ash, difficult to grind, easy to explode, and severe slagging fuel. The igniti...

AI Technical Summary

Problems solved by technology

In the past, in the transformation process of most boilers, biomass pellet fuel was directly used instead of conventional coal fuel, and the corresponding evaluation and transformation of the boiler and various systems were not carried out, resulting in unstable operation, insufficient combustion, serious coking, and heating surface of the boiler. problems such as corrosion

Images