초록 ▼

The evaporating tubes of an acid concentrating system are positioned within a double-walled tube unit which directs heating gases over the tube and are supported at their lower ends on a spherical bearing surface which permits relative movement of the components without inducing unacceptable stress

The evaporating tubes of an acid concentrating system are positioned within a double-walled tube unit which directs heating gases over the tube and are supported at their lower ends on a spherical bearing surface which permits relative movement of the components without inducing unacceptable stress levels.

대표청구항 ▼

Apparatus for supporting an elongated evaporating tube in a system for purifying mineral acids, said apparatus comprising: a double-walled tube unit having an outer flow channel for heating gases between its inner and outer walls, said evaporating tube being arranged within said tube unit and spaced

Apparatus for supporting an elongated evaporating tube in a system for purifying mineral acids, said apparatus comprising: a double-walled tube unit having an outer flow channel for heating gases between its inner and outer walls, said evaporating tube being arranged within said tube unit and spaced therefrom to define an inner flow channel for heating gases between said evaporating tube and said inner wall; means connecting said inner and outer flow channels in flow through relationship at the lower portion of said tube unit whereby flow of heating gases in said inner channel is opposite in direction to flow in said outer channel; shoulder means extending from the lower end of said evaporating tube and having a spherical exterior contact surface; seal means situated about said evaporating tube, against which said spherical contact surface seals; a reduced diameter portion formed in the lower end of said evaporating tube below said spherical contact surface said portion extending through said seal means; a collection vessel into which said reduced diameter portion extends; and means for supporting said evaporating tube against radial movement near its upper end.