Filter for pulverized coal as fired of pyrolysis furnace

The invention discloses a filter for pulverized coal as fired of a pyrolysis furnace. The filter comprises a shell, an outer top cover, an inner top cover, a metal fiber filter net, an exhaust air feeding through pipe, a dust funnel, an inner exhaust air discharge through pipe and an outer exhaust air discharge through pipe, wherein the exhaust air feeding through pipe is arranged at the circumferential side of the shell from bottom to top, and the dust funnel is arranged inside the shell; the inner exhaust air discharge through pipe is arranged on the inner top cover, and positioned above the dust funnel, and an inlet of the inner exhaust discharge through pipe is lower than an inlet of the exhaust air feeding through pipe; and the outer exhaust air discharge through pipe is arranged on the outer top cover, and the metal fiber filter net is arranged between the inner top cover and the outer top cover. The pulverized coal in the air can be effectively filtered through the metal fiber filter net when the heated air naturally rises by the thermal buoyancy without additional air pumps, fans and other energy-consuming devices, the structure is simple, and the cost is saved.