System and method for gasification treatment of waste cathode carbon blocks of aluminum electrolysis cell in cooperation with oxygen-enriched combustion of coal, and application of system

The invention relates to a technology for waste and cathode carbon blocks of aluminum electrolysis cells, which is applied in the directions of combustion method, combustion using block fuel and gaseous fuel, chemical instruments and methods, etc., and can solve the problems such as the limitation of the addition amount of waste cathode carbon blocks of aluminum electrolysis cells, etc. To achieve the effect of easy promotion, simple method and improved economy

Inactive Publication Date: 2020-11-10
山东魏桥铝电有限公司
View PDF9 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventor found that it is not the best choice to directly mix the waste cathode carbon block of aluminum electrolytic cell with coal for oxygen-enriched combustion in a pulverized coal furnace, because the amount of waste cathode carbon block of aluminum electrolytic cell is limited.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • System and method for gasification treatment of waste cathode carbon blocks of aluminum electrolysis cell in cooperation with oxygen-enriched combustion of coal, and application of system
  • System and method for gasification treatment of waste cathode carbon blocks of aluminum electrolysis cell in cooperation with oxygen-enriched combustion of coal, and application of system
  • System and method for gasification treatment of waste cathode carbon blocks of aluminum electrolysis cell in cooperation with oxygen-enriched combustion of coal, and application of system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as figure 1 As shown, the system mainly includes the following equipment: pulverized coal furnace 1, denitrification / dust removal / desulfurization treatment device 2 for pulverized coal furnace oxygen-enriched combustion flue gas, circulating fluidized bed gasifier 3 and circulating fluidized bed secondary fluorine fixation Reactor 4. The pulverized coal A first enters the pulverized coal furnace 1, and is combusted with the purified gasification gas C from the circulating fluidized bed secondary fluorine fixation reactor 4 under the combustion support of oxygen B to form a 2 , a small amount of water vapor flue gas, after the flue gas denitrification / dust removal / desulfurization treatment device 2 becomes high concentration CO 2 Flue gas E(CO 2 The volume concentration is greater than 95%), which can be stored or resourced after being condensed and liquefied. In order to reduce the temperature of coal in oxygen-enriched combustion, part of the flue gas E is extr...

Embodiment 2

[0058] The gasification characteristics and hydrogen fluoride removal characteristics of waste cathode carbon blocks and oxygen-enriched combustion flue gas of aluminum electrolytic cell were studied experimentally in a bubbling fluidized bed reactor. The fluorine content of the waste cathode carbon block of the aluminum electrolytic cell is about 12.55%, the carbon content is about 47.62%, and the ash content is about 46.33%. The inner diameter of the bubbling fluidized bed reactor is 32 mm, the height is 900 mm, and the length of the constant temperature zone is 200 mm. In simulated flue gas (CO 2 +H 2 The effect of the molar ratio of O) to carbon in the waste cathode carbon block of the electrolyzer on the gasification conversion rate of the waste cathode carbon block. The reaction conditions are as follows: simulated CO in flue gas 2 The volume fraction is 90%, the water vapor is 10%, the total flow of flue gas into the fluidized bed is 2L / min, the reaction time is 20mi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention relates to a system and a method for gasification treatment of waste cathode carbon blocks of an aluminum electrolysis cell in cooperation with oxygen-enriched combustion of coal, and application of the system. The method comprises the following steps: feeding part of high-temperature flue gas generated by oxygen-enriched combustion of a pulverized coal furnace into a circulating fluidized bed gasification furnace, and performing a gasification reaction on waste cathode carbon blocks of an aluminum electrolysis cell and the high-temperature flue gas in the gasification furnace togenerate gasified gas; adding a calcium-based absorbent into the gasification furnace, wherein hydrogen fluoride is removed, calcium fluoride is generated, and primary fluorine fixing is achieved; feeding the gasified gas containing a small amount of hydrogen fluoride into a circulating fluidized bed secondary fluorine-fixing reactor, adding aluminum oxide particles into the reactor to remove hydrogen fluoride in the gasified gas so as to generate aluminum fluoride, wherein secondary fluorine fixing is achieved; and making the purified gasified gas enter the pulverized coal furnace to be subjected to oxygen-enriched combustion together with pulverized coal to form flue gas containing high-concentration CO2, so that the flue gas can be sealed or recycled. According to the method, waste cathode carbon blocks of an aluminum electrolysis cell are converted into combustible gas, CO2 capture and synergistic removal of various pollutants such as hydrogen fluoride are achieved, coal consumption is reduced, and the method has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental pollutant prevention and clean combustion, and specifically relates to a system and method for gasification treatment of waste cathode carbon blocks of an aluminum electrolytic cell in conjunction with coal oxygen-enriched combustion. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] my country is a big country in the production of electrolytic aluminum. The waste cathode carbon block of aluminum electrolytic cell is the main waste in the production process of electrolytic aluminum, and its original composition is anthracite and pitch binder. In the electrolysis process, aluminum fluoride, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/00C10J3/56C10J3/66F23C5/08F23L7/00B01D53/00
CPCB01D53/002C10J3/00C10J3/56C10J3/66C10J2300/0953F23C5/08F23L7/00Y02E20/34Y02P20/151
Inventor 王景坤刘维红李英杰张继刚牛钰赵立刚
Owner 山东魏桥铝电有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap