Method and systems for a multistage exhaust gas cooler
AssigneeTransportation IP Holdings, LLC
InventorsHafiz Hassan Eisa, Pradheepram Ottikkutti, Paul Lloyd Flynn
Life of this patent
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Abstract
Various methods and systems are provided for an exhaust gas cooler. In one example, a method includes controlling a flow of coolant to at least a first stage of a plurality of stages of an exhaust gas cooler relative to a second stage of the plurality of stages to maintain at least one of: a controlled amount of heat removal from the first stage relative to the second stage, an about equal coolant temperature increase across the first stage relative to the second stage; an about equal gas temperature decrease across the first stage relative to the second stage; and an about equal gas heat removal across the first stage relative to the second stage.
Claims20
A method, comprising:
- individually adjusting an amount or flow rate of coolant entering a coolant inlet of at least a first stage of a plurality of stages of an exhaust gas cooler relative to a second stage of the plurality of stages with a controller and at least one valve,
- the one or more individual adjustments based on inputs to the controller from temperature sensors at each stage and, the one or more individual adjustments maintaining at least one of:
- a controlled amount of heat removal from the first stage relative to the second stage;
- an about equal coolant temperature increase across the first stage relative to the second stage;
- an about equal gas temperature decrease across the first stage relative to the second stage;
- or an about equal gas heat removal across the first stage relative to the second stage.
A system for an exhaust gas cooler, comprising:
- an exhaust gas inlet and an exhaust gas outlet;
- a plurality of serially arranged stages positioned between the exhaust gas inlet and the exhaust gas outlet, each stage of the plurality of serially arranged stages including a plurality of cooling tubes coupled between a coolant inlet and a coolant outlet;
- and
- a controller with computer readable instructions stored in memory for:
- individually adjusting an amount or flow rate of coolant to the coolant inlet of each stage of the plurality of serially arranged stages with valves, the individual adjustments based on inputs of temperature sensors positioned at each exhaust gas outlet and/or coolant outlet in order to maintain at least one of an about equal coolant temperature increase across each stage, an about equal gas temperature decrease across each stage, and an about equal gas heat removal across each stage.
A method, comprising:
- selectively directing exhaust gas to two or more exhaust coolers;
- receiving signals at a controller from temperature sensors of each stage positioned at each coolant outlet and/or exhaust gas outlet;
- and
- sending signals with the controller to individually adjust a flow rate or amount of coolant through each stage of a plurality of stages of at least one of the two or more exhaust coolers to maintain one of a relatively equal coolant temperature increase across each stage, a relatively equal gas temperature decrease across each stage, or a relatively equal gas heat removal across each stage.
Dependencies are inferred from the claim text.