# US 12,215,614 B2 · Exhaust gas system for a hydrogen combustion engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,614 B2 - Document ID: US12215614B2 - Status: Granted - Kind: B2 - Application number: 18/448,557 - Filed: 2023-08-11 - Published: 2024-02-15 - Granted: 2025-02-04 - Earliest claimed: 2022-08-11 - Assignees: Purem GmbH - Applicants: Purem GmbH - Inventors: Gerd Gaiser - Web page: https://patentgrep.com/patent/US12215614B2 ## CPC - F01N 3/0205: {using heat exchangers} - F01N 3/005: {for draining or otherwise eliminating condensates or moisture accumulating in the apparatus (F01N3/02 takes precedence)} - F01N 3/043: {without contact between liquid and exhaust gases} - F01N 3/2013: {using electric or magnetic heating means} - F01N 5/00: Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy (using kinetic or wave energy of exhaust gases in exhaust systems for charging F02B) - F01N 2240/02: a heat exchanger - F01N 2240/22: a condensation chamber - Y02T 10/12: Improving ICE efficiencies - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust gas system for a hydrogen combustion engine including for a vehicle, the exhaust gas system including: a first engine exhaust gas cooler accommodating a flow of engine exhaust gas therethrough for dissipating heat from the engine exhaust gas; a separator being configured to separate condensate contained in the engine exhaust gas in a region of the first engine exhaust gas cooler and/or downstream of the first engine exhaust gas cooler; and, an engine exhaust gas heater being configured to warm the engine exhaust gas in a region of the separator and/or downstream of the separator. ## Claims ### Claim 1 An exhaust gas system for a hydrogen combustion engine including for a vehicle, the exhaust gas system comprising: a first engine exhaust gas cooler accommodating a flow of engine exhaust gas therethrough for dissipating heat from the engine exhaust gas, said first engine exhaust gas cooler including a first heat exchanger for transferring heat from the engine exhaust gas to a cooling medium including a cooling liquid or cooling gas; a separator being configured to separate condensate contained in the engine exhaust gas in a region of said first engine exhaust gas cooler and/or downstream of said first engine exhaust gas cooler; and, an engine exhaust gas heater being configured to warm the engine exhaust gas in a region of said separator and/or downstream of said separator, said engine exhaust gas heater including a second heat exchanger for transferring heat from a heating medium including a heating liquid or heating gas, to the engine exhaust gas; wherein a heat transfer medium flows through said first heat exchanger and said second heat exchanger to provide said cooling medium and said heating medium. ### Claim 2 (depends on 1) The exhaust gas system of claim 1, wherein the engine exhaust gas heater includes at least one electrically excitable heater. ### Claim 3 (depends on 1) The exhaust gas system of claim 1, further comprising an engine exhaust gas line leading to said first engine exhaust gas cooler. ### Claim 4 (depends on 1) The exhaust gas system of claim 1, further comprising an engine exhaust gas outlet line leading away from said engine exhaust gas heater. ### Claim 5 (depends on 4) The exhaust gas system of claim 4, further comprising at least one of: i) at least one oxidizer; and, ii) at least one catalytic converter being arranged in said engine exhaust gas outlet line. ### Claim 6 (depends on 5) The exhaust gas system of claim 5, further comprising at least one reactant dispensing arrangement for dispensing reactant into the engine exhaust gas. ### Claim 7 (depends on 6) The exhaust gas system of claim 6, wherein at least one reactant dispensing arrangement is arranged upstream of at least one catalytic converter. ### Claim 8 (depends on 4) The exhaust gas system of claim 4, further comprising: at least one muffler arranged in said engine exhaust gas outlet line leading away from said engine exhaust gas heater. ### Claim 9 (depends on 1) The exhaust gas system of claim 1, further comprising at least one of: i) an oxidizer including an oxidation catalytic converter; ii) a burner for oxidizing hydrogen contained in the engine exhaust gas; and, iii) at least one catalytic converter including an SCR catalytic converter for decreasing nitrogen oxide proportions contained in the engine exhaust gas. ### Claim 10 A drive system for a vehicle, the drive system comprising: a hydrogen combustion engine; and, an exhaust gas system for said hydrogen combustion engine, said exhaust gas system including: a first engine exhaust gas cooler accommodating a flow of engine exhaust gas therethrough for dissipating heat from the engine exhaust gas, said first engine exhaust gas cooler including a first heat exchanger for transferring heat from the engine exhaust gas to a cooling medium including a cooling liquid or cooling gas; a separator being configured to separate condensate contained in the engine exhaust gas in a region of said first engine exhaust gas cooler and/or downstream of said first engine exhaust gas cooler; and, an engine exhaust gas heater being configured to warm the engine exhaust gas in a region of said separator and/or downstream of said separator, said engine exhaust gas heater including a second heat exchanger for transferring heat from a heating medium including a heating liquid or heating gas, to the engine exhaust gas; wherein a heat transfer medium flows through said first heat exchanger and said second heat exchanger to provide said cooling medium and said heating medium. ### Claim 11 A method for operating a drive system including a hydrogen combustion engine for a vehicle, the drive system including a first engine exhaust gas cooler accommodating a flow of engine exhaust gas therethrough for dissipating heat from the engine exhaust gas, said first engine exhaust gas cooler including a first heat exchanger for transferring heat from the engine exhaust gas to a cooling medium including a cooling liquid or cooling gas; a separator being configured to separate condensate contained in the engine exhaust gas in a region of said first engine exhaust gas cooler and/or downstream of said first engine exhaust gas cooler; and, an engine exhaust gas heater being configured to warm the engine exhaust gas in a region of said separator and/or downstream of said separator, said engine exhaust gas heater including a second heat exchanger for transferring heat from a heating medium including a heating liquid or heating gas, to the engine exhaust gas, wherein a heat transfer medium flows through said first heat exchanger and said second heat exchanger to provide said cooling medium and said heating medium, the method comprising: cooling the engine exhaust gas outputted by said hydrogen combustion engine to condense water by the heat transfer medium flowing through the first heat exchanger; removing water vapor from the engine exhaust gas; and, heating the engine exhaust gas from which water vapor was removed. ### Claim 12 An exhaust gas system for a hydrogen combustion engine including for a vehicle, the exhaust gas system comprising: a first engine exhaust gas cooler accommodating a flow of engine exhaust gas therethrough for dissipating heat from the engine exhaust gas, said first engine exhaust gas cooler including a first heat exchanger for transferring heat from the engine exhaust gas to a cooling medium including a cooling liquid or cooling gas; a separator being configured to separate condensate contained in the engine exhaust gas downstream of said first engine exhaust gas cooler; and, an engine exhaust gas heater being configured to warm the engine exhaust gas in a region of said separator and/or downstream of said separator, said engine exhaust gas heater including a second heat exchanger for transferring heat from a heating medium including a heating liquid or heating gas, to the engine exhaust gas; wherein a composite heat exchanger provides said first heat exchanger and said second heat exchanger; said composite heat exchanger including an upstream heat exchanger region accommodating the flow of the engine exhaust gas therethrough and a downstream heat exchanger region downstream of said upstream heat exchanger region; and, said downstream heat exchanger region lying in heat transfer interaction with said upstream heat exchanger region. ### Claim 13 (depends on 12) The exhaust gas system of claim 12, wherein said separator is arranged downstream of said upstream heat exchanger region and upstream of said downstream heat exchanger region. ### Claim 14 (depends on 12) The exhaust gas system of claim 12, further comprising a second engine exhaust gas cooler for dissipating heat from the engine exhaust gas and said second engine exhaust gas cooler is arranged in accordance with at least one of: i) downstream of said upstream heat exchanger region; ii) at a downstream end of said upstream heat exchanger region and upstream of said downstream heat exchanger region; and, iii) at an upstream end of said downstream heat exchanger region. ### Claim 15 (depends on 14) The exhaust gas system of claim 14, wherein said second engine exhaust gas cooler includes a third heat exchanger for transferring heat from the engine exhaust gas to a cooling medium including a cooling liquid or cooling gas. ### Claim 16 (depends on 15) The exhaust gas system of claim 15, wherein said composite heat exchanger includes a heat exchanger housing; said upstream heat exchanger region and said downstream heat exchanger region are arranged in said heat exchanger housing; and, wherein at least one of the following applies: i) said third heat exchanger is arranged in said heat exchanger housing; and, ii) said heat exchanger housing is arranged in a surrounding manner on an outer side. ### Claim 17 (depends on 12) The exhaust gas system of claim 12, wherein said composite heat exchanger includes a countercurrent heat exchanger or a cross-flow heat exchanger.