Heat integration

A system for heat integration between (i) a partner plant which generates steam or another working fluid as part of a power cycle and (ii) an emissions to liquid (ETL) plant which produces heat from an exothermic reaction, wherein:

• a bleed stream taken from a turbine associated with the power cycle of the partner plant is fed into a heat exchanger of the ETL plant for heating a bottoms condensate fraction from a distillation column in a reboiler associated with said distillation column of the ETL plant, the heat exchanger returning a cold stream to a water pre-heater of the partner plant, wherein the reboiler is configured to obtain heat, directly or indirectly, from the exothermic reaction conducted within a reactor of the ETL plant;
• a pump associated with the partner plant which supplies a condensed cold stream from the turbine associated with the power cycle of the partner plant to a heat exchanger associated with the partner plant, the heat exchanger being configured to receive heat from the exothermic reaction of the ETL plant and exchange the heat from the exothermic reaction of the ETL plant as a hot stream to the cold stream from the turbine associated with the partner plant to heat said cold stream, and return a preheated stream to a water pre-heater associated with the partner plant for final heating of a steam or other working fluid in a steam or other working fluid generator associated with the power cycle of the partner plant.

An ETL (emissions to liquid) plant comprising:

• two feed streams,
• wherein the first feed stream contains water from which hydrogen is produced in an electrolysis unit, and the second feed stream comprises CO2;
• an electrolysis unit, which is configured to receive water from the first feed stream and generate hydrogen gas from the water;
• a CO2 capture unit, which is configured to receive CO2 from the second feed stream;
• at least one compressor, wherein the at least one compressor is configured to compress at least one of the hydrogen gas, the CO2, and/or a mixture of the two gases;
• a plurality of heat exchangers, at least one heat exchanger being configured to receive a mixture of the hydrogen gas and the CO2 from the at least one compressor;
• a reactor, which is configured to receive a heated mixture of the hydrogen gas and the CO2 from the heat exchanger and within which an exothermic reaction is conducted;
• a catch pot, which is configured to receive a bypass portion of the heated mixture of the hydrogen gas and the CO2 that is not fed into the reactor;
• a catch pot top fraction, which is configured to be recycled back into the at least one compressor that is configured to compress at least one of the hydrogen gas, the CO2, and/or a mixture of the two gases;
• a distillation column, which is configured to receive a bottom fraction from the catch pot;
• a condenser, which is configured to receive a top fraction from the distillation column:
• a reflux stream, which is a portion of the top fraction from the distillation column that is configured to be recycled back into the distillation column after leaving the condenser;
• a distillate stream sent to storage, which comprises a high purity liquid chemical, isolated from the distillation column;
• a reboiler, which is configured to receive a bottom fraction from the distillation column, to return a heated bottom fraction from the distillation column to the distillation column, and wherein the reboiler obtains heat, directly or indirectly, from the exothermic reaction conducted in the reactor;
• and a source of steam or other heating medium generated electrically, which is configured to provide heat to the reboiler in order to complete heating a fluid used to re-boil the bottom fraction from the distillation column in the reboiler when the heat obtained by the reboiler from the exothermic reaction conducted in the reactor is not sufficient.

A system for internal heat integration within a plant comprising:

• a reactor within which an exothermic reaction is conducted;
• a reboiler for reheating a bottoms condensate fraction from a distillation column;
• a pump configured to receive a cold stream from the reboiler and to increase the pressure of the cold stream from the reboiler;
• first and second heat exchangers;
• wherein the first heat exchanger is connected to an outlet of the reactor and is configured to receive from the pump the cold stream from the reboiler;
• and
• wherein the second heat exchanger is configured to receive an outlet stream from the first heat exchanger which has been heated to an increased temperature relative to the cold stream and to further heat the outlet stream to a desired temperature before feeding the heated outlet stream to the reboiler.