Feeding system of biomass boiler

Abstract

The invention discloses a feeding system of a biomass boiler. The feeding system comprises a large storage hopper, a longitudinal kick-off device, a small storage hopper, a spiral conveyer, an articulated chute, a flame arrester, a transition pipe, an expansion joint and a transition blanking tube. The feeding system is characterized by also comprising a transverse kick-off device and an air hose; the air hose is tipsily inserted and welded into the articulated chute; the lower part of the articulated chute is directly connected with the flame arrester; the lower part of the flame arrester is directly connected with the transition pipe in a matching manner, and the transition pipe is connected with a feeding pipe of the boiler through the expansion joint. The feeding system has the beneficial effects that the fuel bridging problem in the storage hopper is improved; material kicking and controlling are even; the problem that the fuel at the end part of the spiral conveyer is rolled and overstocked is solved; and the problem that the fuel is easily accumulated at the bottom of the articulated chute is also solved. Meanwhile, the backfire problem when a hearth explodes or abnormally generates positive pressure suddenly can be effectively prevented by the flame arrester structure, and safe and continuous running period of the biomass boiler of a circulating fluidized bed is also prolonged.

Description

Technical field: [0001] The invention relates to a feeding system of a biomass fluidized bed boiler. Background technique: [0002] The circulating fluidized bed biomass boiler has many advantages such as high combustion efficiency, wide adaptability of fuel types, and good pollutant emission indicators. Therefore, circulating fluidized bed biomass boilers have developed rapidly in recent years, but there are still some problems in the blanking device of circulating fluidized bed biomass boilers during operation; for example, the density of biomass fuel is small, and it is easy to The loose accumulation at the drop pipe is often easy to form bridges and other phenomena. The fuel loosely accumulated in the drop pipe cannot quickly fall into the boiler only by its own weight, which seriously affects the continuous and uniform feeding requirements of the boiler feed system; the actual biomass fuel There is a lot of dust, which is rich in combustibles released by a large amount...

AI Technical Summary

Problems solved by technology

Therefore, circulating fluidized bed biomass boilers have developed rapidly in recent years, but there are still some problems in the blanking device of circulating fluidized bed biomass boilers during operation; for example, the density of biomass fuel is small, and it is easy to The loose accumulation at the drop pipe is often easy to form bridges and other phenomena. The fuel loosely accumulated in the drop pipe cannot quickly fall into the boiler only by its own weight, which seriously affects the continuous and uniform feeding requirements of the boiler feed system; the actual biomass fuel There is a lot of dust, which is rich in combustibles released by a large amount of biomass fuel - volatile matter, so the design of the front silo needs to be fireproof, and the space where the blanking port enters the furnace requires negative pressure combustion, but in the actual boiler During operation, deflagration or abnormal sudden positive pressure will occur in the furnace, so that the open flame will flow back into the silo through the feeding pipe, and then detonate the combustible dust in the silo, causing production safety accidents; When fuel is bridged and accumulated at the pipe, the workers on duty usually use steel drills to smash the accumulated fuel downward through the inspection door. Because a large amount of fuel suddenly enters the furnace, the open flame in the boiler furnace will quickly reverse and burn the workers who are operating. , and then cause the combustion of the entire silo, seriously damage the fuel delivery system, the boiler unit is forced to shut down, and the economic and property losses are huge

Images