Energy storage method and device for biomass cascade pyrolysis coupled with new energy power generation

Patent metadata

Field	Value
Publication number	US-12276236-B2
Application number	US-202418957936-A
Country	US
Kind code	B2
Filing date	Nov 25, 2024
Priority date	May 26, 2022
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

The provided is energy storage method and device for biomass cascade pyrolysis coupled with new energy power generation. The key point of the technical solution is that, with inexpensive, clean and safe biomass as energy storage medium, the redundant unstable electric energy is converted by a cascade pyrolysis energy storage system into an easy-to-store liquid and solid chemical energy in biomass pyrolytic products, and based on use requirements, can be further converted into clean fuels for power generation or exported renewable chemicals, so as to realize continuous stable output of the new energy power generation systems. Furthermore, the cascade pyrolysis energy storage system can, based on the principle of “energy level matching”, fully recover and utilize the electric energy, high-temperature heat energy and low-temperature heat energy generated in pyrolysis processes, thereby maximizing the energy utilization efficiency of the system.

First claim

What is claimed is:

1. An energy storage device for biomass cascade pyrolysis coupled with new energy power generation, comprising a feeding system, a cascade pyrolysis system, a post-treatment system and an output system, wherein
the feeding system comprises a biomass feedstock bin, a feedstock-conveying device, a first gas locker and a second gas locker sequentially connected;
the cascade pyrolysis system comprises a low-temperature pyrolysis device and a high-temperature pyrolysis device; the low-temperature pyrolysis device is connected with a heat transfer oil storage box, wherein a circulating heat transfer oil is introduced into the heat transfer oil storage box to provide heat required for low-temperature pyrolysis; wherein a heat source of the heat transfer oil storage box comes from an electric energy of a new energy power generation system, an exhaust heat energy of a power generation system and a high-temperature heat energy recovered from a condensation system and a high-temperature storage bin, comprising 1): the new energy power generation system heats the heat transfer oil storage box by electric heating; 2) an exhaust discharged by a power generator in the power generation system goes through the heat transfer oil storage box, and a heat energy in the high-temperature exhaust is recovered and transferred to the heat transfer oil in the heat transfer oil storage box; 3) a liquid side of a first gas-liquid heat exchanger in the condensation system is connected with the heat transfer oil storage box, and an inlet of a gas side is connected with a high-temperature pyrolytic gas to recover a heat in the high-temperature pyrolytic gas for the heat transfer oil storage box of the low-temperature pyrolysis device; 4) the high-temperature storage bin is configured to store bio-char delivered by the high-temperature pyrolysis device and with a circulating nitrogen introduced as a heat exchange medium inside, to recover and convey a high-temperature heat energy in the high-temperature bio-char to the heat transfer oil in the heat transfer oil storage box;
the post-treatment system comprises a condensation system, a power generation system, and an exhaust treatment device, and the power generation system comprises a booster fan, an internal combustion engine and a power generator;
the output system comprises a high-temperature storage bin and a low-temperature storage bin, and the high-temperature storage bin is configured to store the bio-char delivered by the high-temperature pyrolysis device and the pre-cooled bio-char is discharged by the high-temperature storage bin into the low-temperature storage bin; wherein an electric energy required by the high-temperature pyrolysis device is supplied by the new energy power generation system;
the electric energy required by various systems of the energy storage device for the biomass cascade pyrolysis is supplied by the new energy power generation system and comprises a mechanical energy, a heat energy and an electric energy required by various systems;
when the new energy power generation system aims to realize stable electric energy output, the energy storage device for the biomass cascade pyrolysis further comprises a mixing device, the condensation system comprises a first gas-liquid heat exchanger, a spray tower heat exchanger and a gas storage tank sequentially connected, a high-temperature pyrolytic gas outlet of the high-temperature pyrolysis device is connected with an inlet of the first gas-liquid heat exchanger, an outlet of the first gas-liquid heat exchanger and a low-temperature pyrolytic gas outlet of the low-temperature pyrolysis device are both connected with an inlet of the spray tower heat exchanger, and the mixing device mixes a bio-oil captured by the condensation system with the bio-char from the low-temperature storage bin to prepare a slurry fuel;
when the new energy power generation system aims to consume redundant electric energy, the energy storage device for the biomass cascade pyrolysis further comprises a hydrogen making device, the condensation system comprises a first gas-liquid heat exchanger, a second gas-liquid heat exchanger, a spray tower heat exchanger and a gas storage tank sequentially connected, the high-temperature pyrolytic gas outlet of the high-temperature pyrolysis device is connected with the inlet of the first gas-liquid heat exchanger, the low-temperature pyrolytic gas outlet of the low-temperature pyrolysis device is connected with an inlet of the second gas-liquid heat exchanger, an outlet of the second gas-liquid heat exchanger is connected with the inlet of the spray tower heat exchanger, the high-temperature pyrolytic gas of the high-temperature pyrolysis device sequentially runs through the first gas-liquid heat exchanger, the second gas-liquid heat exchanger, and the spray tower heat exchanger to produce low-temperature, medium-temperature and high-temperature bio-oils by three-stages condensation mode, the low-temperature pyrolytic gas of the low-temperature pyrolysis device is connected to the condensation system through the second gas-liquid heat exchanger to produce the medium-temperature and high-temperature bio-oils sequentially by condensation, the medium-temperature and low-temperature bio-oils produce corresponding products by hydrogen added by the hydrogen making device, and the high-temperature bio-oil is configured to subsequently prepare an electrochemical high-quality activated carbon;
a bottom liquid outlet of the spray tower heat exchanger is configured to output a condensed bio-oil, and a top gas outlet is connected with the gas storage tank; an outlet of the gas storage tank is connected with an inlet of the booster fan; an outlet of the booster fan is connected with the internal combustion engine; the internal combustion engine is connected with the power generator; the power generator supplies power to the high-temperature pyrolysis device;
an exhaust of the internal combustion engine sequentially flows through the low-temperature pyrolysis device and the biomass feedstock bin for recovery of heat energy in the exhaust and is discharged after being treated by the exhaust treatment device;
wherein a heat exchange amount of the first gas-liquid heat exchanger in the condensation system is configured to heat the heat transfer oil for use by the low-temperature pyrolysis device, and heat exchange amounts of the second gas-liquid heat exchanger and the spray tower heat exchanger are configured to dry and preheat a raw biomass in the biomass feedstock bin.

2. The energy storage device for the biomass cascade pyrolysis according to claim 1 , wherein the feeding system is configured to convey the raw biomass to the low-temperature pyrolysis device, and the second gas locker is connected with an inlet of the low-temperature pyrolysis device.

3. The energy storage device for the biomass cascade pyrolysis according to claim 1 , wherein the low-temperature pyrolysis device has a housing with a jacket layer, and a low-temperature feed screw is disposed along a central axis; an inlet end of the housing is connected with the second gas locker, an outlet end of the housing has an upper outlet and a lower outlet, the upper outlet is a low-temperature pyrolytic gas outlet and connected with an inlet of the condensation system; the lower outlet is a low-temperature bio-char outlet and connected with an inlet of the high-temperature pyrolysis device; the low-temperature feed screw and the jacket layer are both hollow structures, and both ends of the low-temperature feed screw and the jacket layer are respectively connected to inlet and outlet of the heat transfer oil storage box to introduce the circulating heat transfer oil.

4. The energy storage device for the biomass cascade pyrolysis according to claim 1 , wherein the high-temperature pyrolysi

Assignees

• Univ Southeast

Inventors

• Zhang Huiyan
• Su yinhai
• Peng Bo
• Chu Sheng
• Tao Yujie
• Cao Qi
• Xiao Rui

Classifications

• Y02E50/10

  Biofuels, e.g. bio-diesel · CPC title

• F02B63/04

  for electric generators · CPC title

• C10G1/002

  in combination with oil conversion- or refining processes · CPC title

• C10G1/00

  Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal (mechanical winning of oil from oil-shales, oil-sand, or the like B03B) · CPC title

• C10B47/44

  with conveyor-screws · CPC title