Composite grate combustion equipment

Abstract

The invention discloses composite grate combustion equipment and relates to the technical field of biomass fuel boilers. Bilateral sides of a grate of the composite grate combustion equipment are respectively provided with water cooling headers; the grate is formed by a reciprocating grate at the front section and a catenary chain tensioning type chain grate at the rear section; the reciprocating grate which is inclined downward along the movement direction of fuel is higher than the catenary chain tensioning type chain grate. The fuel is fed into the inclined type reciprocating grate through a feeder to be preheated and dried and then is driven by the reciprocating grate to move in a downward roll mode step by step and a rolling falling effect through the height difference at a stair position of the two grates is achieved, the time for staying in the air of the fuel is prolonged, the fuel permeability is increased, and the fuel and the combustion-supporting oxygen are fully mixed. The inclined reciprocating grate plays a role in preheating and drying and the catenary chain tensioning type chain grate plays a role in discharging and burning out. According to the composite grate combustion equipment, when various biomass fuel and high-moisture fuel are combusted, the height difference between the two grates are utilized, fuel combustion is facilitated, the combustion is full, the burn-off rate of the fuel is greatly improved, and the combustion efficiency of the equipment is improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of biomass fuel boilers, in particular to a biomass fuel boiler with a composite fire grate. Background technique [0003] As a clean and renewable energy source, the utilization of biomass energy has become the consensus of the whole world. Replacing fossil fuels with biomass is a way to reduce CO 2 emissions, an ideal way to reduce greenhouse gas emissions. Out of consideration for the environment and energy structure, the state has given policy support and promotion in the use of biomass energy, restricted the construction of small coal-fired units, and approved many biomass fuel power plants, which makes biomass boilers have big market. At present, boilers in biomass power plants adopt single vibrating grate with imported technology, or adopt domestic conventional chain grate. This combustion mode is aimed at directional fuel and has certain restrictions on the moisture content of fuel. Boil...

AI Technical Summary

Problems solved by technology

At the same time, the operation of the conventional chain grate is unstable, the sealing performance is poor, the air leakage is serious, and the efficiency is low; while the domestic fuel purchase market is often high-moisture fuel, or even a mixture of various fuels, which makes it found that the fuel does not burn well during actual operation. Fully, the unburned fuel will be discharged from the slag outlet, and the combustion of the fuel on the single vibrating grate is unstable and disturbance occurs

Some biomass fuels will also produce slagging during the combustion process, which is easy to block the grate, resulting in no ventilation and inability to replenish oxygen in time, which not only affects normal combustion, low heat utilization rate, but also causes blackening of the boiler during use smoke phenomenon

Images