Small biomass briquette circulating fluidized bed hot water boiler

Abstract

The invention discloses a small biomass briquette circulating fluidized bed hot water boiler, belongs to the technical field of boiler combustion, and provides the small biomass briquette circulating fluidized bed hot water boiler which is low in steel consumption, low in buried pipe abrasion and low in NOX emission. The small biomass briquette circulating fluidized bed hot water boiler is characterized in that a water jacket is arranged on the side wall of a hearth; a plurality of buried pipes are arranged at the lower part inside the hearth; the plurality of buried pipes are distributed in the circumferential direction of an inner cavity of the hearth; the upper ends of the plurality of buried pipes communicate with the water jacket; the lower ends of the plurality of buried pipes communicate with an annular buried pipe collection box; the annular buried pipe collection box is mounted at the lower part of the outer side wall of the hearth; a high-speed bed air chamber is arranged at the central part of the bottom inside the hearth; a low-speed bed air chamber is arranged outside the high-speed bed air chamber; and an air smoke system communicates with a tail flue. According to the invention, the biomass briquette circulating fluidized bed hot water boiler is miniaturized, the rated thermal power is 7 MW or below, the floor space is small, the steel consumption is low, the utilization of refractory and heat insulating materials is greatly reduced, and generated NOX can be effectively decreased.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion, and in particular relates to a circulating fluidized bed hot water boiler burning biomass molding fuel. Background technique [0002] In recent years, the environmental problems caused by coal utilization have become increasingly prominent. According to the "Action Plan for Air Pollution Prevention and Control" issued by the State Council, coal-fired boilers with a capacity of 10t / h (7MW) and below will be phased out. Biomass is a renewable and clean energy with low content of sulfur, nitrogen and ash, and has CO 2 With the reputation of "zero" emission, it is an ideal substitute for coal in the field of thermal power. At present, there are two main types of boilers burning biomass, one is a layer fired boiler and the other is a circulating fluidized bed boiler. The combustion method of the layer-fired boiler is simple, but it is difficult to control the temperature in the furnace. Wh...

AI Technical Summary

Problems solved by technology

However, conventional small circulating fluidized bed boilers have the following problems: heavy-duty furnace walls are used, which occupy a large area and are expensive;

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