Pulverized coal concentrator, design method thereof and pulverized coal combustion system

The embodiment of the invention provides a pulverized coal concentrator, a design method thereof and a pulverized coal combustion system. The pulverized coal concentrator provided by the embodiment of the invention comprises a right-angle bent pipe, a thick pulverized coal pipe and a thin pulverized coal pipe, the inner wall face of the right-angle bent pipe comprises a concentration face and a bent pipe face which are arranged on the peripheral side of the inner wall face of the right-angle bent pipe, and a pulverized coal channel is defined by the concentration face and the bent pipe face. The pulverized coal channel is provided with a pulverized coal air inlet and a pulverized coal air outlet which are oppositely arranged in the pulverized coal conveying direction, and the pulverized coal air outlet comprises a thick pulverized coal outlet and a thin pulverized coal outlet; an inlet of the thick pulverized coal pipe is connected with the thick pulverized coal outlet; and an outlet of the thin pulverized co