Low-boiling-point fuel staged combustion device and system

Abstract

The invention discloses a low-boiling-point fuel staged combustion system which comprises a fuel storage tank, a fuel pump, an evaporator, a graded combustion device and a fan. The fuel pump lifts low-boiling-point fuel in the fuel storage tank into the evaporator to be heated to form steam-state fuel; the steam-state fuel passes through a steam-state fuel injection pipe to enter the staged combustion device; primary air passes through a fan to enter a primary air cavity of the graded combustion device, makes contact with the steam-state fuel at the tail end of the steam-state fuel injection pipe to enter a premixing chamber, the front end of the premixing chamber is in a bottle neck shape, and a swirl plate is arranged on the front portion of the premixing chamber and located behind the front end in the bottle neck shape; after the primary air and the steam-state fuel are premixed under stirring of the swirl plate, the mixture enters a divergent chamber connected with the premixing chamber to be ignited by an igniter arranged at the front end of the divergent chamber for combustion; secondary air enters the middle rear portion of the divergent chamber from a secondary air pipe, and stable combustion of the steam-stage fuel is kept. The low-boiling-point fuel staged combustion system has the advantages that the air combustion mixing effect is good, and staged air distribution achieves low-nitrogen combustion.

Description

technical field [0001] The invention relates to a low-boiling point fuel staged combustion device and its system, in particular to a device system for low-nitrogen combustion after the low-boiling point fuel is vaporized. Background technique [0002] As the public pays more attention to atmospheric pollution, the pollution of coal-fired industrial boilers and small boilers is facing more severe pressure to control or shut down. Therefore, clean coal utilization technology has received more and more attention. At the same time, looking for clean alternative energy is also a solution, such as renewable energy such as biomass, or natural gas, alcohol-based fuels, etc. [0003] Alcohol-based fuels are generally low-boiling fuels, which are relatively easy to completely decompose and burn, and are a relatively clean alternative energy source. However, the relatively mature ignition and combustion devices are oil or gas burners, which are not completely suitable for alcohol-base...

AI Technical Summary

Problems solved by technology

Current alcohol-based fuel gasification combustion devices have problems such as poor gasification effect and easy blockage of gasification devices, while liquid combustion devices are often relatively complex in structure and not stable in effect

In addition, the way of ignition and gasification in the burner is often difficult to effectively control the air excess coefficient to ensure low-nitrogen combustion

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