Overview of rotary kiln burner

Rotary kiln burner is mainly composed of pipeline, nozzle, metal corrugated compensator, butterfly valve, pressure measuring instrument and protective layer, etc.

Pipeline

From outside to inside, there are axial flow wind, swirl wind Channel, fuel channel and central wind Channel respectively.

Nozzle

Processed by heat-resistant steel, the cross-sectional area of the outlet of axial flow wind and swirl wind can be adjusted to adjust the spraying speed of each channel wind. The whole set of nozzles is the key component to ensure the flame shape.

Axial wind (swirling wind) corrugated compensator

It is the main component of connecting shaft (rotary) flowing air internal and external pipelines,sealing and adjusting flame shape.

Butterfly valve

Used to adjust the air volume.

Pressure measuring instrument

Indirectly display the speed of the air outlet in the burner.

The combustion is sprayed out by the fuel channel according to a certain diffusion angle, and is transmitted to a fairly high momentum and momentum moment by the neighboring combustion-supporting wind. The swirling wind inside and the sprayed fuel are mixed in a high speed and spiral forward, meeting the axial wind beam emitted at a high speed.

The insertion of axial flow wind beam further enhances the mixing of fuel and wind, and can adjust the divergence degree of flame. It can adjust the length and thickness of flame as needed to reach the desired flame shape. The function of the central wind is to promote the combustion of a small amount of fuel and CO in the central part, so as to make the combustion more sufficient and stabilize the flow. Due to this Combustion mechanism and the high speed of swirling wind and axial wind, combustion is very rapid and complete.

Second,

Procedure

First start the exhaust fan at the end of the kiln, adjust the frequency to about 30HZ for more than 10 minutes, and then reduce the frequency to 5~10HZ before ignition to ensure slight negative pressure in the kiln. Special attention should be paid to the operating procedures of igniting first and sending gas later when the gas fuel is ignited, so as to prevent the wrong operation of sending gas first and then igniting.

Third,

Maintenance

1.The spout end of each pipeline is a nozzle made of heat resistant steel. The nozzle is in a high temperature state for a long time, especially if the kiln stops and the Air stops suddenly during combustion, the front end face of the burner will directly bear the heat radiation of the high temperature and scorching materials in the kiln, and will be oxidized and damaged over time. In order to prolong the service life of the nozzle, the following points should be paid attention:

(1) when the combustion is stopped, the combustion should be stopped and the wind should be stopped once. Only when the temperature in the kiln drops to 300℃ can the wind be stopped once;

(2) the integrity of the castable on the head is the premise to ensure the normal operation of the burner, and timely measures should be taken when the castable falls off;

(3) when the kiln is stopped, enter the kiln to check the abrasion, deformation and coking of the burner, and handle it in time and replace it if necessary.

2.Attention should be paid to the sealing of each interface during use. If there is air leakage, it should be handled.

3.After the ignition is successful, the ignition line should be pulled out 1 meter away from the head to prevent burning loss.

4.When replacing the burner, ensure the concentricity between the nozzles, otherwise it is difficult for axial scaling between the layers.

5.The correct pouring and maintenance of the castable is especially important for the normal operation and service life of the burner: firstly, the castable must use the special castable of the burner, and secondly, check the condition of the castable every time when the kiln is shut down for major repair and minor repair. If there are cracks and gaps, it must be poured again.