A kind of suspension catalytic oxidation flameless combustion method of wet biomass fuel

Abstract

A suspension catalytic oxidation flameless combustion method of a wet biomass containing fuel comprises the following steps: (1) modification treatment: grinding the wet biomass containing fuel, spraying a liquid catalysis combustion-supporting agent during the grinding process or after grinding, and carrying out homogenization to obtain a modified wet biomass containing fuel; and (2) suspension catalytic oxidation flameless combustion: delivering the modified wet biomass containing fuel obtained in the step (1) into a decomposing furnace of a conventional dry method cement production line system, and increasing the blowing rate of the high temperature fan of the dry method cement production line system until the blowing rate is above the system balance blowing rate. The air blowing of the system and the support temperature field (840-1200 DEG C) in the decomposing furnace are utilized to realize suspension catalytic oxidation flameless combustion of the wet biomass containing fuel, and the generated thermal energy is directly supplied to the decomposition of calcium carbonate in the decomposing furnace. The low cost wet biomass containing fuel can be used as a substitute fuel for cement production, does not influence the working conditions of the kiln system, and will not affect the clinker output.

Description

technical field [0001] The invention relates to a combustion method of wet biomass fuel, in particular to a suspension catalytic oxidation combustion method of wet biomass fuel. Background technique [0002] Biomass fuel is the fourth largest energy after coal, oil, and natural gas. It occupies an important position in the entire energy system. The use of renewable biomass fuel can effectively protect the environment. However, there are a large number of crop fruit branches and straws in my country every year. Such as wet plant fiber fuel is discarded in the field, the resulting harm is shocking, especially during the annual summer harvest and autumn harvest, due to the open burning of straw, smoke billows from south to north in my country, and the air environment deteriorates sharply. Highways are closed, canals are suspended, planes are forced to land elsewhere, and vicious incidents of fires caused by straw burning, loss of property, injury and death occur every year. [0...

AI Technical Summary

Problems solved by technology

The project has achieved good emission reduction effect by replacing part of the coal-fired coal with shaped straw fuel. Every 1.5 tons of shaped straw fuel can replace 1 ton of coal-fired coal. The use of straw fuel requires a lot of land for storage, regardless of its use or dehydration, and its seasonality, land occupation, dehydration, and fire prevention have become problems that cannot be ignored; the second is the shaping of processing The equipment wears quickly and the power consumption is high; the third is that the mixed combustion speed of the molded straw fuel and coal powder in the special fluidized bed calciner is poorly matched, which makes the operation of the system more difficult; the fourth is that factors such as high potassium and chlorine content have a negative impact on the kiln system. The stability of working conditions has been affected, which objectively caused the loss of clinker output

However, the drying of this mixture requires high energy consumption, and the CO produced by the energy required for drying into biomass fuel 2 CO emissions reduction with this biomass fuel 2 equivalent

[0010] Furthermore, due to the lack of new biomass combustion technology and methods, in the current national policies and environmental protection standards, direct combustion of biomass is a highly polluting fuel, which is only allowed to be used in large stoves in rural areas, not in cities