Boiler combustion system with material returning function

Abstract

The boiler combustion system with the material returning function comprises a boiler body, smoke outlets are formed in the two sides of the top of the boiler body, one end of each smoke outlet is connected with a high-temperature separator, a smoke outlet pipe is connected to the top of the high-temperature separator, the lower end of the high-temperature separator extends to one side of the bottom of the boiler body and is provided with a material returning device, and an ash discharging pipe is arranged at the bottom of the material returning device; one side of the material returning device is connected with the furnace body through a material returning pipe, a material returning fan is arranged on the other side of the material returning device, the smoke outlet pipe comprises a blocking part, an air inducing part and a discharging part which are sequentially connected from bottom to top, an intercepting face is arranged on the side, away from the smoke outlet, of the blocking part, and the bottom of the intercepting face is lower than the bottom face of the smoke outlet. An arc-shaped opening is formed in the side, close to the smoke outlet, of the blocking part, the upper end of the arc-shaped opening extends to the position above the top face of the smoke outlet, and an annular heat insulation layer is arranged on the inner wall of the smoke outlet pipe. The service life of the smoke outlet pipe can be effectively prolonged, and the material returning effect of the boiler is improved.

Description

technical field [0001] The invention relates to a coal-fired boiler, in particular to a boiler combustion system with the function of returning material. Background technique [0002] Since a large amount of unburned particulate matter will be discharged with the flue gas during the use of the fluidized bed coal-fired boiler, the particulate matter will not only increase the processing burden and processing cost of the flue gas, but also cause a waste of resources; Most manufacturers generally install a return device on the outside of the coal-fired boiler, and use the return device to intercept this part of the particulate matter and re-send it into the boiler for secondary combustion, so as to fully utilize the dye and reduce the amount of pollutants in the flue gas. impurity content. [0003] The existing method for returning materials used in coal-fired boilers is described in the patent 202023121873.8 "A Recycled Coal-Fired Boiler". A smoke outlet pipe is arranged outs...

AI Technical Summary

Problems solved by technology

[0004] One is because the temperature of the flue gas is high when it is discharged, and the exit direction is perpendicular to the side wall of the flue pipe, so that when the flue gas is intercepted by the flue gas, it will be continuously impacted by the high-temperature flue gas from the front, resulting in Holes and breakage of the metal on the surface of the smoke outlet pipe

In response to this problem, although manufacturers can wrap the outer wall of the smoke outlet pipe with materials such as heat-insulating cotton and heat-insulating coating, this method can only achieve a limited protective effect, and the surface protective layer will still appear after long-term use damaged

However, because the exhaust pipe needs to be fixed inside the boiler, it cannot be taken out and replaced after the boiler is put into use, and cannot be protected stably for a long time, resulting in defects in the stability of the exhaust pipe.

[0005] The second is that when the flue gas discharged from the boiler flows towards the flue pipe, the heavier particles will break away from the airflow and fall naturally, but some lighter and smaller particles will still flow in with the flue gas. In the smoke outlet pipe, the existing return device cannot separate it, and the return effect is not ideal

[0006] Therefore, the existing coal-fired boilers have the problems that the smoke outlet pipe is easily damaged and the return effect is poor.

Images