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 . <EOS>