Control method for a system having reduced nitrogen oxide emissions and for use in a carbon negative emission method

Patent metadata

Field	Value
Publication number	US-12305121-B2
Application number	US-202418611273-A
Country	US
Kind code	B2
Filing date	Mar 20, 2024
Priority date	Dec 7, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

Carbon negative emission methods, a nitrogen oxide ultra-low emission system, an air supply device and a flow control module. The system for use in carbon negative emission methods enables biomass to produce inorganic carbon and pyrolysis gas/gasification gas to realize negative emission of carbon. The nitrogen oxide ultra-low emission system enables fuel to be in mixed combustion with the pyrolysis gas/gasification gas to remove nitrogen oxides, which realizes ultra-low emission of the nitrogen oxides. The air supply device is in communication with a biomass pyrolysis coupling partial gasification and is in communication with the system for use in carbon negative emission methods and the nitrogen oxide ultra-low emission system. The pyrolysis gas/gasification gas enters the nitrogen oxide ultra-low emission system. The flow control module controls a flow ratio of a pyrolysis agent/gasification agent entering the system for use in carbon negative emission methods and flow of the pyrolysis gas/gasification gas and air entering the nitrogen oxide ultra-low emission system.

First claim

What is claimed is:

1. A control method for a system having reduced nitrogen oxide emissions and for use in a carbon negative emission method, the control method comprising:
providing the system having reduced nitrogen oxide emissions and for use in a carbon negative emission method, the system having reduced nitrogen oxide emissions and for use in a carbon negative emission method comprising a plurality of flow monitoring meters and a plurality of electric butterfly valves, wherein the plurality of flow monitoring meters are respectively disposed on an outlet pipeline of an air blower, an outlet pipeline of a water vapor generator, a first outlet pipeline, and an outlet of a second pipeline, and wherein the plurality of electric butterfly valves comprise:
a first electric butterfly valve disposed on the outlet pipeline of the air blower;
a second electric butterfly valve disposed on the outlet pipeline of the water vapor generator;
a third electric butterfly valve disposed on a fourth pipeline; and
a fourth electric butterfly valve disposed on the outlet of the second pipeline;

subjecting a biomass in the system having reduced nitrogen oxide emissions and for use in a carbon negative emission method to at least one of a pure pyrolysis reaction and a pyrolysis coupling partial gasification reaction,
wherein when the system having reduced nitrogen oxide emissions and for use in a carbon negative emission method is used to subject the biomass to a pure pyrolysis reaction, closing the second electric butterfly valve and the third electric butterfly valve; opening the first electric butterfly valve and introducing nitrogen, and opening the fourth electric butterfly valve;
wherein when the system having reduced nitrogen oxide emissions and for use in a carbon negative emission method is used to subject the biomass to a pyrolysis coupling partial gasification reaction, opening the first electric butterfly valve, the second electric butterfly valve, the third electric butterfly valve and the fourth electric butterfly valve, supplying air using the air blower;
adjusting a flow of water vapor entering the system having reduced nitrogen oxide emissions and for use in a carbon negative emission method, air and fuel gas generated in a combustion chamber of the system having reduced nitrogen oxide emissions and for use in a carbon negative emission method together with water vapor precipitated when drying the biomass fuel, by controlling opening degrees of the first electric butterfly valve, the second electric butterfly valve and the third electric butterfly valve, thereby adjusting a component ratio of pyrolysis gas/gasification gas, a yield of the pyrolysis gas/gasification gas and a yield of inorganic carbon.

2. The control method of the nitrogen oxide ultra-low emission and carbon negative emission system according to claim 1 , wherein the system having reduced nitrogen oxide emissions and for use in a carbon negative emission method further comprises a boiler and the method further comprising: controlling temperature of the boiler, an excess air coefficient of a combustion zone of pyrolysis gas/gasification gas in the boiler, a total excess air coefficient in the boiler, and a distribution ratio of air supply volumes of a first air supply mechanism and a second air supply mechanism to realize reduced nitrogen oxide emissions.

Assignees

• Univ Zhejiang

Inventors

• Luo Zhongyang
• Wang Qinhui
• Yu Chunjiang
• Zhou Jinsong
• Fang Mengxiang
• Wang Yinchen

Classifications

• C10B57/10

  Drying · CPC title

• C10B41/00

  Safety devices, e.g. signalling or controlling devices for use in the discharge of coke · CPC title

• B01D45/16

  generated by the winding course of the gas stream {, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes} · CPC title

• B01D2251/208

  Hydrocarbons · CPC title

• B01D2251/204

  Carbon monoxide · CPC title