# US 11,027,950 B2 · System having a secondary current generating assembly for the secondary conversion into electricity of exhaust gas heat from a primary current generating assembly

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- Number: US 11,027,950 B2
- Document ID: US11027950B2
- Status: Granted
- Kind: B2
- Application number: 16/346,007
- Filed: 2017-10-25
- Published: 2020-02-20
- Granted: 2021-06-08
- Earliest claimed: 2016-10-31
- Assignees: Konecranes Global Corporation
- Applicants: Konecranes Global Corporation
- Inventors: Reinhard Bauer
- Web page: https://patentgrep.com/patent/US11027950B2

## CPC

- B66C 19/007: {for containers}
- B60L 50/15: with additional electric power supply (with capacitors charged by engine-driven generators B60L50/40; with batteries charged by engine-driven generators B60L50/61)
- B66C 13/18: Control systems or devices (exclusively for rope, cable, or chain winding mechanisms B66D1/40)
- B66C 13/22: for electric drives (transmitting control pulses B66C13/40; systems or devices of general application H02P)
- F01N 5/04: the devices using kinetic energy
- F02C 6/006: {Open cycle gas-turbine in which the working fluid is expanded to a pressure below the atmospheric pressure and then compressed to atmospheric pressure}
- F02G 5/02: Profiting from waste heat of exhaust gases
- B60L 50/50: using propulsion power supplied by batteries or fuel cells
- B60L 2200/42: Fork lift trucks
- B60L 2220/42: with use of more than one motor
- F17C 2221/033: Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
- F17C 2223/0161: cryogenic, e.g. LNG, GNL, PLNG
- Y02E 20/14: Combined heat and power generation [CHP]
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- B66C: CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES ({specially adapted for lifting invalids A61G7/10;} rope, cable, or chain winding mechanisms, braking or detent devices therefor B66D; specially adapted for nuclear reactors G21)
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- 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)
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F02G: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A system having a primary current generating assembly includes a primary thermal engine and a secondary current generating assembly, in particular an electric turbo compound installation, for the secondary conversion into electricity of exhaust gas heat from the primary current generating assembly. The secondary current generating assembly includes an exhaust gas turbine arranged in an exhaust gas stream of the primary thermal engine, and the exhaust gas turbine drives an electric secondary generator. In order to improve efficiency, and in particular to reduce fuel consumption, it is proposed that an exhaust gas cooler followed by a compressor are arranged in the exhaust gas stream downstream of the exhaust gas turbine, the compressor being driven by an electric motor and the rotational speeds of the compressor and the exhaust gas turbine are controlled by a process control system. The disclosed invention also relates to a vehicle equipped therewith.

## Claims

### Claim 1

A vehicle for handling freight containers having a system having a primary current generating assembly, comprising a primary thermal engine, and having a secondary current generating assembly, in the form of an electric turbo compound installation, for secondary conversion into electricity of exhaust gas heat of the primary current generating assembly, wherein the secondary current generating assembly comprises an exhaust gas turbine, disposed in an exhaust gas stream of the primary thermal engine, and the exhaust gas turbine drives a secondary electric generator, wherein, in the exhaust gas stream, an exhaust gas cooler followed by a compressor is disposed behind the exhaust gas turbine, the compressor is driven by an electric motor and the rotational speeds for the compressor and exhaust gas turbine are controlled by a process regulating system, wherein a secondary inverter is allocated to the secondary generator, a frequency converter is allocated to the electric motor of the compressor, and the secondary inverter and the frequency converter are communicatively connected via a field bus to an electronic central controller, wherein the electronic central controller permits control of the energy flows of the primary current generating assembly and of the secondary current generating assembly, and the primary current generating assembly and the secondary current generating assembly supply at least one travel drive and at least one lifting drive with energy, wherein the rotational speeds for the compressor and exhaust gas turbine are controlled by the process regulating system in such a way that ambient pressure prevails in the exhaust gas stream at the input of the exhaust gas turbine.

### Claim 2 (depends on 1)

The vehicle as claimed in claim 1, wherein the rotational speeds for the compressor and exhaust gas turbine are controlled by the process regulating system in such a way that negative pressure prevails in the exhaust gas stream at the output of the exhaust gas turbine.

### Claim 3 (depends on 1)

The vehicle as claimed in claim 1, wherein the secondary current generating assembly operates according to the inverted Brayton cycle (IBC).

### Claim 4 (depends on 1)

The vehicle as claimed in claim 1, wherein the rotational speed of the secondary generator can be adjusted by the process regulating system.

### Claim 5 (depends on 1)

The vehicle as claimed in claim 1, wherein the rotational speed of the compressor can be adjusted by the electric motor and the process regulating system.

### Claim 6 (depends on 1)

The vehicle as claimed in claim 1, wherein the primary thermal engine is designed as a piston engine or turbine.

### Claim 7 (depends on 6)

The vehicle as claimed in claim 6, wherein the primary thermal engine uses cryogenic liquefied natural gas (LNG) as fuel.

### Claim 8 (depends on 1)

The vehicle as claimed in claim 1, wherein the vehicle is a harbor crane, a mobile harbor crane, a rubber tire-borne gantry crane or a gantry lift stacker.

### Claim 9 (depends on 1)

The vehicle as claimed in claim 1, wherein the rotational speeds for the compressor and exhaust gas turbine are controlled by the process regulating system in such a way that negative pressure prevails in the exhaust gas stream at the output of the exhaust gas turbine.

### Claim 10 (depends on 9)

The vehicle as claimed in claim 9, wherein the secondary current generating assembly operates according to the inverted Brayton cycle (IBC).

### Claim 11 (depends on 10)

The vehicle as claimed in claim 10, wherein the rotational speed of the secondary generator can be adjusted by the process regulating system.

### Claim 12 (depends on 11)

The vehicle as claimed in claim 11, wherein the rotational speed of the compressor can be adjusted by the electric motor and the process regulating system.

### Claim 13 (depends on 12)

The vehicle as claimed in claim 12, wherein the primary thermal engine is designed as a piston engine or turbine.

### Claim 14 (depends on 13)

The vehicle as claimed in claim 13, wherein the primary thermal engine uses cryogenic liquefied natural gas (LNG) as fuel.

### Claim 15 (depends on 14)

The vehicle as claimed in claim 14, wherein the vehicle is a harbor crane, a mobile harbor crane, a rubber tire-borne gantry crane or a gantry lift stacker.