A device for separating solid particles from a gas stream, comprising an entry tube having: - an inlet port for receiving an incoming gas flow, - a vortex section having a diameter decreasing in the flow direction, the vortex section comprising at least one internal spiral wall forming at least one helical channel; an annular exit port section having at least one peripheral exit opening, and an outlet tube arranged coaxially with the entry tube, wherein the exit port section connects the entry tube to the outlet tube, wherein the entry tube additionally comprises a separation section having a constant diameter and a length at least five times the width of helical channel of the vortex section arranged between the vortex section and the annular exit port section, the width of the helical channel being defined as the distance between the internal spiral walls forming the at least one helical channel; and wherein the vortex section comprises a core body extending along the central axis; the core body having a first end widening in the flow direction; an intermediate section having a constant diameter; and a second end narrowing in the flow direction and extending into the separation section. - an inlet port for receiving an incoming gas flow, - a vortex section having a diameter decreasing in the flow direction, the vortex section comprising at least one internal spiral wall forming at least one helical channel; an annular exit port section having at least one peripheral exit opening, and an outlet tube arranged coaxially with the entry tube, wherein the exit port section connects the entry tube to the outlet tube, wherein the entry tube additionally comprises a separation section having a constant diameter and a length at least five times the width of helical channel of the vortex section arranged between the vortex section and the annular exit port section, the width of the helical channel being defined as the distance between the internal spiral walls forming the at least one helical channel; and wherein the vortex section comprises a core body extending along the central axis; the core body having a first end widening in the flow direction; an intermediate section having a constant diameter; and a second end narrowing in the flow direction and extending into the separation section. an annular exit port section having at least one peripheral exit opening, and an outlet tube arranged coaxially with the entry tube, wherein the exit port section connects the entry tube to the outlet tube, wherein the entry tube additionally comprises a separation section having a constant diameter and a length at least five times the width of helical channel of the vortex section arranged between the vortex section and the annular exit port section, the width of the helical channel being defined as the distance between the internal spiral walls forming the at least one helical channel; and wherein the vortex section comprises a core body extending along the central axis; the core body having a first end widening in the flow direction; an intermediate section having a constant diameter; and a second end narrowing in the flow direction and extending into the separation section.