Coal pyrolysis, pyrolysis gas heating and schreyerite reduction coupled system and method

A technology of coal pyrolysis and pyrolysis gas, which is applied in the direction of furnace types, furnaces, shaft furnaces, etc., can solve the problems of increasing compressor investment, energy consumption waste, and affecting furnace conditions, etc., to reduce water and electricity consumption, reduce water consumption, Effect of reducing equipment investment amount

Pending Publication Date: 2017-10-20
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the excessively high temperature of this method causes the pellets to stick together, which affects the smooth operation of the furnace, and the obtained hot reducing gas must be cooled and then pressurized, which not only increases the investment in the compressor, but also causes energy consumption and waste.

Method used

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  • Coal pyrolysis, pyrolysis gas heating and schreyerite reduction coupled system and method
  • Coal pyrolysis, pyrolysis gas heating and schreyerite reduction coupled system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The raw coal is crushed to -5mm and dried at 200°C. The heat of drying coal powder comes from the flue gas of the coal pyrolysis furnace. The dried coal is transported to the top bin of the coal pyrolysis furnace for use. The formed vanadium-titanium oxide pellets are transported to the top silo of the shaft furnace for use. The main components and contents of vanadium-titanium magnetite and vanadium-titanium oxide pellets are shown in Table 1 and Table 2. The gas heating furnace is heated by a ceramic radiant tube.

[0085] Table 1 Main components and content% of vanadium-titanium magnetite

[0086] Element

TF

FeO

Fe 2 o 3

V 2 o 5

TiO 2

content

54.12

23.09

51.08

0.65

15.77

[0087] Table 2 Main components and content% of vanadium-titanium oxide pellets

[0088] Element

TF

Fe 2 o 3

FeO

V 2 o 5

TiO 2

content

52.16

74.02

0.50

0.63

15.19

[00...

Embodiment 2

[0098] The raw coal is crushed to -5mm, dried at 150°C, and then transported to the top silo of the coal pyrolysis furnace for use. The heat of drying coal powder comes from the flue gas of the coal pyrolysis furnace, and the vanadium titanium made of vanadium titanium magnetite The oxidized pellets are transported to the silo at the top of the shaft furnace for use. The main components and contents of vanadium-titanium magnetite and vanadium-titanium oxidized pellets are shown in Table 1 and Table 2. The gas heating furnace is heated by a ceramic radiant tube.

[0099] First, the raw coal is continuously fed from the top of the coal pyrolysis furnace through the feeding screw, and the pulverized coal stays in the furnace for 1.5s, and is pyrolyzed during the downward process of pulverized coal in the pyrolysis device to generate solid semi-coke and pyrolysis gas. The components of coke and pyrolysis gas are shown in Table 6 and Table 7 respectively. The pressure in the furnace...

Embodiment 3

[0108] The raw coal is crushed to -5mm, dried at 150°C, and then transported to the top silo of the coal pyrolysis furnace for use. The heat of drying coal powder comes from the flue gas of the coal pyrolysis furnace, and the vanadium titanium made of vanadium titanium magnetite The oxidized pellets are transported to the silo at the top of the shaft furnace for use. The main components and contents of vanadium-titanium magnetite and vanadium-titanium oxidized pellets are shown in Table 1 and Table 2. The gas heating furnace is heated by a ceramic radiant tube.

[0109] First, the raw coal is continuously fed from the top of the coal pyrolysis furnace through the feeding screw, and the pulverized coal stays in the furnace for 1.5s, and is pyrolyzed during the downward process of pulverized coal in the pyrolysis device to generate solid semi-coke and pyrolysis gas. The components of coke and pyrolysis gas are shown in Table 9 and Table 10 respectively. The pressure in the furnac...

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Abstract

The invention relates to a system and method for coupling coal pyrolysis, ceramic radiant tube heating and vanadium-titanium ore reduction process. The system includes a coal pyrolysis furnace, a heating furnace and a shaft furnace; the coal pyrolysis furnace includes a coal pyrolysis charge bin and coal pyrolysis gas outlet; the heating furnace is a ceramic radiant tube gas heating device, which includes a coal pyrolysis gas inlet and a reducing gas outlet, and the coal pyrolysis gas inlet and the coal pyrolysis gas outlet pass through pyrolysis The gas pipeline is connected; the shaft furnace includes a gas injection port, a shaft furnace bunker and a shaft furnace discharge port, the shaft furnace bin is arranged on the top of the shaft furnace, and the gas injection port is arranged in the middle of the shaft furnace and connected to the shaft furnace The reducing gas outlet is connected. By organically combining coal chemical industry with metallurgical production, the present invention improves resource utilization, reduces production equipment, reduces the production cost and energy consumption of reducing gas semi-coke produced by vanadium-titanium DRI, low-quality coal, and medium-low rank coal, and improves production competitiveness.

Description

technical field [0001] The invention relates to the technical field of chemical metallurgy, in particular to a system and method for coupling coal pyrolysis, ceramic radiant tube heating and vanadium-titanium ore reduction process. Background technique [0002] When the traditional blast furnace process or non-blast furnace coal-based direct reduction process is used to smelt vanadium-titanium ore, since only iron and vanadium are recovered, the titanium grade in the slag is too low to have an economically reasonable recovery value, resulting in a large loss of titanium resources. [0003] Because the gas-based direct reduction method has the characteristics of high efficiency, low pollution, and no dependence on coking coal, it has become a new technology that gradually replaces the traditional blast furnace ironmaking technology and has been widely used worldwide. The current direct reduction process mainly uses natural gas as the reducing agent, and the reducing agent cra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCC21B13/02C21B13/006C21B13/0073
Inventor 邓君曹志成冯鲁兴范志辉韩志彪唐敬坤吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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