Biomass gas steam generator

Abstract

The invention discloses a biomass gas steam generator. The generator comprises a pre-combustion chamber, a mixing chamber, a lean combustion chamber, a smoke tube, a smoke returning chamber, an axialblade combustor and an ejector; lithium bromide dilute solution or water is introduced through an introduction opening, the lithium bromide dilute solution or water is heated through the lean combustion chamber, a second return smoke pipe, a third return smoke pipe, a lower middle smoke returning chamber, an upper middle smoke returning chamber and a pipe plate to form saturated steam; lithium bromide concentrated solution is introduced into a low-pressure generator from a outlet opening through a liquid bag; the saturated steam is led out from the outlet opening, secondary air is introduced from a secondary air inlet opening, hot air formed by heating is mixed with the weak reducing flue gas at an outlet of the pre-combustion chamber in the mixing chamber through the ejector to form high-temperature high-speed lean air, then the high-temperature high-speed lean air is sprayed into the lean combustion chamber, and is mixed with secondary biomass gas to realize lean combustion. The biomass gas steam generator has the advantages of rich combustion and lean combustion, the energy consumption of a fan is low, the radiant heat flux is high, the temperature field uniformity is good, thecombustion is stable, the Nox generation amount is low, the greenhouse gas emission is low, and the structure is compact.

Description

technical field [0001] The invention relates to the technical field of combustion equipment, in particular to a biomass gas lean combustion device, to the field of direct-fired absorption lithium bromide heat pump or gas boiler, and to the field of renewable energy utilization. Background technique [0002] In the lean combustion (also called flameless combustion) mode, the turbulent pulsation velocity in the combustion chamber is much greater than the laminar flame propagation velocity. In practice, lean combustion is achieved by increasing the inlet jet velocity or reducing the laminar flame propagation velocity. Generally speaking, the realization of lean combustion mainly faces the following problems: first, the high jet inlet velocity leads to high energy consumption of the fan; second, the strong turbulent shear makes it difficult to ignite the fuel. These problems are the key reasons for the difficulties in the application of lean burn technology. So far, lean combus...

AI Technical Summary

Problems solved by technology

Generally speaking, the realization of lean combustion mainly faces the following problems: first, the high jet inlet velocity makes the fan consume more energy; second, the strong turbulent shear makes it difficult to ignite the fuel

However, increasing the distance between the nozzles will inevitably lead to a rapid increase in the cross-sectional area of ​​the furnace, which is very unfavorable for its miniaturized application in the fields of high-pressure generators of direct-fired absorption lithium bromide units or shell-type fuel-fired gas boilers.

Images