Pulverized coal concentrator, pulverized coal burner and pulverized coal boiler

Abstract

The invention discloses a pulverized coal concentrator, a pulverized coal burner comprising the pulverized coal concentrator and a pulverized coal boiler comprising the pulverized coal burner. The disclosed pulverized coal concentrator comprises an elbow, an outer cylinder and an inner cylinder arranged in the outer cylinder, the front end of the outer cylinder is connected with the back end of the elbow, and the back end of the outer cylinder stretches out backwards, the inner cylinder comprises a conical cylinder segment, the through-flow section of a front end of the conical cylinder segment is smaller than that of a rear end of the conical cylinder segment, the rear end of the conical cylinder segment stretches out backwards, the front end of the conical cylinder segment is communicated with the part at the back end of the elbow, which is deflected to an outer arc. The pulverized coal concentrator in the invention can separate concentrated phase pulverized coal airflow and light phase pulverized coal airflow by utilizing the inner cylinder, the situation of mixing the concentrated phase pulverized coal airflow and the light phase pulverized coal airflow in advance is reduced, and the separating effect of the concentrated phase pulverized coal airflow and the light phase pulverized coal airflow of the pulverized coal concentrator is increased, the disclosed pulverized coal burner and the disclosed pulverized coal boiler has the corresponding technical effect.

Description

technical field [0001] The invention relates to a pulverized coal combustion technology, in particular to a pulverized coal concentrator, and also to a pulverized coal burner including the pulverized coal concentrator and a pulverized coal boiler including the pulverized coal burner. Background technique [0002] In the field of pulverized coal combustion, the concentration separation technology of pulverized coal is a key technology that is widely used; through the concentration separation technology, the pulverized coal airflow can be separated into a dense phase pulverized coal airflow and a light phase pulverized coal airflow. The effects of this are: ① improve the low-load stable combustion capability of the boiler; ② enable the boiler to obtain good anti-slagging performance; ③ reduce the NOx generation of the boiler; ④ improve the ignition performance of the burner. [0003] The more typical burners using this technology include louver-type horizontal thick-lean pulve...

AI Technical Summary

Problems solved by technology

[0005] In short, the performance of the pulverized coal concentrator will directly affect the concentration separation effect of the pulverized coal airflow, and then affect the overall performance of the pulverized coal burner

[0006] The above-mentioned louver pulverized coal concentrator is provided with multiple cascades on the pulverized coal airflow channel, which uses the impact of the airflow and the inertial difference between the gas and solid phases to generate density separation; At a certain angle, there will be two adverse effects: one is that the resistance of the burner is greatly increased; the other is that the cascade is easily worn by the impact of coal powder

As for the elbow concentrator, although the density separation caused by the inertia difference between the gas and solid phases when the pulverized coal flow passes through the elbow is used, the resistance added by the burner is less while concentrating the pulverized coal; No follow-up mandatory isolation measures are taken. After a certain distance, the dense phase of pulverized coal airflow and the light phase of pulverized coal airflow will be mixed, so that the concentration of pulverized coal will be restored quickly; therefore, it cannot be achieved in practical applications To the ideal concentration effect, and then affect the overall performance of the pulverized coal burner

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