Patent Number: 
Section: claims

1. An insulated solution injector comprising:an outer tube having a first outer surface and a first inner surface;an inner tube extending into the outer tube, the inner tube having a second outer surface and a second inner surface, the first inner surface of the outer tube and the second outer surface of the inner tube defining an annular space, the second inner surface of the inner tube defining a solution space;an injection tip connected to distal ends of the outer tube and the inner tube, the injection tip including a base portion and a shield portion projecting from the base portion, the base portion having a hole extending therethrough, the hole being in communication with the solution space; andan insulating liner within the inner tube and the hole of the injection tip, the insulating liner defining an internal passage and including a body section, a neck section, and a lip section, the body section being within the distal end of the inner tube, the neck section extending through the hole in the base portion of the injection tip, the lip section being on an opposite side of the base portion from the body section, the lip section having a larger diameter than the neck section, a rim of the hole in the base portion being gripped by an undersurface of the lip section, the internal passage at an upstream end of the insulating liner being larger than the internal passage at a downstream end of the insulating liner. 2. The insulated solution injector of claim 1, wherein the outer tube is shorter than the inner tube. 3. The insulated solution injector of claim 1, wherein a proximal end of the outer tube is connected to the second outer surface of the inner tube. 4. The insulated solution injector of claim 1, wherein the inner tube extends coaxially into the outer tube. 5. The insulated solution injector of claim 1, wherein the inner tube is inserted into a recess in the base portion of the injection tip, the recess surrounding the hole and being on an opposite side of the base portion from the shield portion. 6. The insulated solution injector of claim 1, wherein the annular space is isolated from the solution space. 7. The insulated solution injector of claim 1, wherein the shield portion extends along a periphery of the base portion of the injection tip. 8. The insulated solution injector of claim 1, wherein the base portion and the shield portion are in a form of a monolithic structure. 9. The insulated solution injector of claim 1, wherein the shield portion has an angled distal surface. 10. The insulated solution injector of claim 1, wherein the insulating liner is formed of a material that has a melting point of at least 260 degrees Celsius. 11. The insulated solution injector of claim 10, wherein the material is a fluoropolymer. 12. The insulated solution injector of claim 11, wherein the fluoropolymer is polytetrafluoroethylene. 13. The insulated solution injector of claim 12, wherein the polytetrafluoroethylene is filled with at least one of glass fibers, carbon, and graphite. 14. The insulated solution injector of claim 13, wherein the glass fibers are present in an amount ranging from 5% to 40% by weight. 15. The insulated solution injector of claim 13, wherein the carbon is present in an amount ranging from 10% to 35% by weight. 16. The insulated solution injector of claim 13, wherein the graphite is present in an amount ranging from 5% to 15% by weight. 17. An injection system comprising:a pipe having an exterior surface and an interior surface, the interior surface defining a flow space; andan insulated solution injector penetrating the pipe, the insulated solution injector includingan outer tube having a first outer surface and a first inner surface;an inner tube extending into the outer tube, the inner tube having a second outer surface and a second inner surface, the first inner surface of the outer tube and the second outer surface of the inner tube defining an annular space, the second inner surface of the inner tube defining a solution space;an injection tip connected to distal ends of the outer tube and the inner tube, the injection tip being within the flow space of the pipe, the injection tip including a base portion and a shield portion projecting from the base portion, the base portion having a hole extending therethrough, the flow space being in communication with the solution space via the hole; andan insulating liner within the inner tube and the hole of the injection tip, a segment of the inner tube extending into the pipe, the insulating liner being at least as long as the segment of the inner tube that extends beyond the interior surface of the pipe, the insulating liner defining an internal passage and including a body section, a neck section, and a lip section, the body section being within the distal end of the inner tube, the neck section extending through the hole in the base portion of the injection tip, the lip section being on an opposite side of the base portion from the body section, the lip section having a larger diameter than the neck section, the internal passage at an upstream end of the insulating liner being larger than the internal passage at a downstream end of the insulating liner. 18. A method of injecting a solution into a high temperature liquid stream, the method comprising:inserting an injector into a pipe configured to carry a flow of the high temperature liquid stream, the injector configured to deliver the solution into the high temperature liquid stream, the injector including an outer tube, an inner tube extending into the outer tube, and an injection tip connected to distal ends of the outer tube and the inner tube, the outer tube and the inner tube defining an annular space therebetween, the inner tube defining a solution space therein, the injection tip including a base portion having a hole extending therethrough, the hole being in communication with the solution space;insulating the solution from the high temperature liquid stream with a liner within the inner tube and the hole of the injection tip, the liner defining an internal passage and including a body section, a neck section, and a lip section, the body section being within the distal end of the inner tube, the neck section extending through the hole in the base portion of the injection tip, the lip section being on an opposite side of the base portion from the body section, the lip section having a larger diameter than the neck section, a rim of the hole in the base portion being gripped by an undersurface of the lip section, the internal passage at an upstream end of the liner being larger than the internal passage at a downstream end of the liner;injecting the solution into the high temperature liquid stream; andshielding the solution from a full velocity of the flow during the injecting.