Apparatus for injecting substances into liquids

Apparatus for installation in the wall of a liquid containment vessel for injecting substances into a liquid therein, including a refractory block which is pierced by an injection passage, has an injectant delivery pipe therein and has a passage blocking element temporarily located at or in a delivery end of the passage to prevent liquid entering the passage before injection is commenced, the pipe being movable forcibly in the passage at the said element to break or dislodge said element to open the passage for injection, wherein the delivery pipe is part of a lance assembly and wherein positioning means including a detent arrangement acting between the said assembly and a fixed part of the apparatus define a stop for locating the lance assembly at a ready position prior to injection.

Apparatus for installation in the wall of a liquid containment vessel for injecting substances into a liquid therein, including a refractory block which is pierced by an injection passage, has an injectant delivery pipe therein and has a passage blocking element temporarily located at or in a delivery end of the passage to prevent liquid entering the passage before injection is commenced, the pipe being movable forcibly in the passage at the said element to break or dislodge said element to open the passage for injection, wherein the delivery pipe is part of a lance assembly and wherein positioning means including a detent arrangement acting between the said assembly and a fixed part of the apparatus define a stop for locating the lance assembly at a ready position prior to injection, said detent arrangement comprising a spring-loaded element which coacts with an abutment, said abutment having two inclined faces or ramps with which the spring-loaded element coacts to define two stops, the first stop enabling the lance assembly to be held at said ready position and the second stop preventing withdrawal of the lance assembly from an advanced, injection position.

Apparatus according to claim 13, wherein the lance assembly has an inlet head comprising conjoined outer and inner members having aligned bores providing a through passage for conveying injection substance(s) into the delivery pipe, the outer member being pivoted to the inner member and displaceable relative thereto for misaligning the bores to terminate supply of said substance(s) into the pipe when an injection run is to be stopped, an hydraulic ram being provided for displacing the outer member relative to the inner member, and wherein the hydraulic ram is mounted on the said advancing means.

Apparatus for installation in the wall of a liquid containment vessel for injecting substances into a liquid therein, including a refractory block which is pierced by an injection passage, has an injectant delivery pipe therein and has a passage blocking element temporarily located at or in a delivery end of the passage to prevent liquid entering the passage before injection is commenced, the pipe being movable forcibly in the passage at the said element to break or dislodge said element to open the passage for injection, wherein the delivery pipe is part of a lance assembly and wherein positioning means acting between the said assembly and a fixed part of the apparatus define a stop for locating the lance assembly at a ready position prior to injection, said positioning means comprising coacting abutments on the fixed parts and the lance assembly, one of the abutments being a shear pin which is fast with the lance assembly.

Apparatus for injecting substances into a liquid through a wall of a liquid containment vessel, including a refractory block which is pierced by an injection passage, has an injectant delivery pipe therein and has a passage blocking element temporarily located at or in a delivery end of the passage to prevent liquid entering the passage before injection is commenced, the pipe being movable forcibly in the passage at the said element to break or dislodge same to open the passage for injection, wherein the delivery pipe is part of a lance assembly and wherein a stop means is provided to prevent withdrawal or ejection of the lance assembly after an injection has been completed, the stop means comprising respective abutments on the lance assembly and a fixed part of the apparatus.