Liquid cryogen delivery and injection control apparatus

A method for supplying liquid cryogen to a chilling application, the chilling application using the liquid cryogen and producing an exhaust gas, the method comprising:

• supplying liquid cryogen from a feed tank to a liquid cryogen conduit in fluid communication between the feed tank and the chilling application;
• conditioning the liquid cryogen in a vessel which is in fluid communication with the liquid cryogen conduit between the feed tank and the chilling application;
• providing feedback about a weight of the liquid cryogen available to be delivered to the chilling application through the liquid cryogen conduit;
• controlling a speed of delivery of the liquid cryogen only from the vessel to the chilling application by a flow controller, the flow controller interposed between the feed tank and the vessel upstream of and in fluid communication with the vessel for providing gaseous cryogen to the vessel;
• measuring a temperature of the exhaust gas at the chilling application with a device in operative communication with the flow controller;
• and
• varying a pressure in the vessel with the gaseous cryogen from the flow controller for the controlling of the speed of delivery of the liquid cryogen only from the vessel to the liquid cryogen conduit in response to the temperature of the exhaust gas.

A delivery apparatus for delivering liquid nitrogen to a bottom injection mixer, comprising:

• a feed tank containing liquid nitrogen under low pressure;
• a liquid nitrogen conduit in fluid communication between the feed tank and the bottom injection mixer, wherein the liquid nitrogen conduit feeds the liquid nitrogen to a plurality of injectors mounted to the bottom injection mixer and communicating with an interior of the bottom injection mixer;
• wherein the feed tank is in fluid communication with a vessel, the vessel being in fluid communication with the liquid nitrogen conduit between the feed tank and the bottom injection mixer;
• a weight measurement device to provide feedback about a weight of the liquid nitrogen to be delivered to the bottom injection mixer via the plurality of injectors through the liquid nitrogen conduit;
• a flow controller interposed between the feed tank and the vessel upstream of and in fluid communication with the vessel, the flow controller configured to vary a pressure in the vessel with gaseous nitrogen for controlling a speed of delivery of the liquid nitrogen only from the vessel to the liquid nitrogen conduit and into the bottom injection mixer via the plurality of injectors;
• wherein the bottom injection mixer uses the liquid nitrogen and produces an exhaust gas;
• a device for measuring a temperature of the exhaust gas, the device in operative communication with the flow controller;
• wherein the flow controller is configured to vary the speed of delivery of the liquid nitrogen only from the vessel to the liquid nitrogen conduit in response to the temperature of the exhaust gas.