Vertical biomass hot blast heater

Abstract

The invention discloses a vertical biomass hot blast heater. A furnace cavity consists of a separated main combustion chamber for primary combustion, a secondary combustion chamber for secondary combustion, and a settling chamber for settling biomass ash; the upper part of the main combustion chamber is communicated with the upper part of the secondary combustion chamber; the lower part of the secondary combustion chamber is communicated with the lower part of the settling chamber; and high-temperature flue gas generated through the combustion of the main combustion chamber circuitously flows in the furnace cavity. The vertical biomass hot blast heater is designed to be a layer combustion structure with a three-layer combustion chamber structure, a combustion area is divided into the primary combustion chamber and the secondary combustion chamber, the gasification stage and the oxidation stage are separated, and primary air is prevented from being mixed too early. The combustion efficiency of the hot blast heater is improved obviously, the consumption level of fuel can be saved by about 10 percent compared with that of the conventional hot blast heater, and the vertical biomass hot blast heater is suitable for biomass with high moisture content, large dimensional change and high ash content.

Description

technical field [0001] The invention belongs to the field of combustion equipment, and in particular relates to a hot blast stove for generating biomass high-temperature flue gas after burning biomass raw materials for use in other equipment. Background technique [0002] A technical key of biomass briquette fuel processing is to reduce the moisture content of its raw materials to 8% to 12%. The most widely used drying method is: using a vertical biomass hot stove to directly heat biomass raw materials, such as bark, Waste wood, sawdust, straw, etc. Biomass generally has the characteristics of high moisture content, large fuel size change and high ash content. In addition, the uneven air distribution of the layer combustion furnace, the incomplete combustion of the fuel, and the reduction of the thermal efficiency of the hot blast furnace have caused serious pollution to the environment. Therefore, an effective way to improve the efficiency of hot blast stoves and reduce t...

AI Technical Summary

Problems solved by technology

The traditional hot blast stove adopts the natural ventilation at the bottom of the grate. The ventilation has no substantial effect on increasing the combustion rate, and the feeding port is flush with the grate surface. Adequate, low thermal efficiency, large amount of smoke and dust

Images