Ultralow-load self-stable-combustion direct-current combustion device

The utility model discloses an ultralow-load self-stable combustion direct-current combustion device, relates to the technical field of combustion devices, and solves the problem that low nitrogen oxide emission is difficult to guarantee when an existing rich-lean combustor combusts sub-bituminous coal and meagre coal. The device comprises a device shell, a separator, an upper baffle, a lower baffle and two light phase guide plates, the upper baffle and the lower baffle are arranged in the device shell in the axial direction, and the distance between the upper baffle and the lower baffle is reduced from an inlet of the device shell to a nozzle; the separator is arranged at an inlet of the device shell and has a trapezoidal cross section; and the two light phase guide plates are respectively arranged above the upper baffle plate and below the lower baffle plate. According to the utility model, the concentration of high-concentration pulverized coal is realized through the concentration structure, and the low-l