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Device and method for producing gas base shaft furnace reducing gas by adopting pyrolysis

A gas-based shaft furnace and pyrolysis furnace technology, which is applied to shaft furnaces, catalytic treatment of combustible gases, furnaces, etc., can solve the problems of complicated procedures for the separation and purification system of pyrolysis waste gas, high cost of coal tar capture and further utilization, and high cost. The problem of unutilized sensible heat of pyrolysis waste gas can improve the utilization value, reduce the tar treatment and dust treatment procedures, and achieve the effect of small investment.

Pending Publication Date: 2018-05-11
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0008] 2. Pyrolysis raw coal gas contains a certain amount of organic matter such as tar, which may have adverse effects on the normal operation of the shaft furnace if it is directly passed into the shaft furnace as reducing gas
[0009] 3. The sensible heat of pyrolysis raw coal gas at 700-900°C is not utilized
[0010] 4. The pyrolysis waste gas separation and purification system has complicated procedures and large investment, and the cost of coal tar capture and further utilization is high

Method used

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  • Device and method for producing gas base shaft furnace reducing gas by adopting pyrolysis

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Embodiment 1

[0026] This embodiment provides a device for producing reducing gas from a gas-based shaft furnace.

[0027] Please combine figure 1 As shown, the device includes a pyrolysis furnace 1, a heating furnace 2, and a gas-based shaft furnace 3.

[0028] The pyrolysis furnace 1 is provided with two mutually independent cavities and raw coal gas exporting device 1-2, and the two cavities are divided into a first cavity and a second cavity; The middle of the cavity is isolated by setting a partition wall 1-1. There is a radiant tube 1-7 in the first cavity; the top of the first cavity has a first feed port 1-3 and the bottom has a first discharge port 1-5. The second cavity has a second feed port 1-4 at the top and a second discharge port 1-6 at the bottom. The raw coal gas exporting device 1-2 sends the gas in the first cavity into the second cavity. A net pyrolysis gas outlet 1-8 is provided above the second cavity, and the net pyrolysis gas outlet 1-8 is connected to the heatin...

Embodiment 2

[0034] This embodiment provides a method for producing a gas-based shaft furnace reducing gas using the above-mentioned device.

[0035] Please combine figure 1 .

[0036] Long-flame coal with a particle size of less than 3mm is fed into the first chamber of pyrolysis furnace 1 through the first feed port 1-3, and the upgraded coal and pyrolysis raw coal gas formed by pyrolysis at 950°C are respectively fed from the first discharge port 1-3 5 and the pyrolysis raw gas exporting device 1-2 is discharged. Pyrolysis crude gas exporting device 1-2, the interface connected to the first cavity is at an angle of 0° to the vertical direction, and the air inlet at the bottom of the air inlet pipe 121 is 1.0m away from the top of the upgraded coal accumulation at the bottom, and has a bell mouth; The middle section 122 is at an angle of 50° to the horizontal. The radiant tubes 1-7 supply heat to the first cavity of the pyrolysis furnace by burning gaseous fuel. 15-25mm coal-based la...

Embodiment 3

[0038] This embodiment provides a method for producing a gas-based shaft furnace reducing gas using the above-mentioned device.

[0039] Lignite with a particle size of less than 3mm is fed into the first chamber of the pyrolysis furnace 1 through the first feed port 1-3, and the upgraded coal and pyrolysis raw coal gas formed by pyrolysis at 900°C are respectively fed from the first discharge port 1-5 and The pyrolysis raw gas exporting device 1-2 is discharged. Pyrolysis raw gas exporting device 1-2, the interface connected with the first cavity is at an angle of 10° from the vertical direction, the distance between the interface and the top of the upgraded coal accumulation at the bottom is 2.0m, and it is in the shape of a bell mouth; the interface connected with the second cavity The angle between the interface and the vertical direction is 0°, and the angle between the middle section 122 and the horizontal direction is 70°. The radiant tubes 1-7 supply heat to the first...

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Abstract

The invention discloses a device and method for producing gas base shaft furnace reducing gas by adopting pyrolysis. The device comprises a pyrolysis furnace, a heating furnace and a gas base shaft furnace, wherein the pyrolysis furnace is internally provided with a first cavity and a second cavity; after pyrolyzed crude gas is treated through the second cavity of the pyrolysis furnace, the pyrolyzed crude gas is heated through the heating furnace and can be introduced into a shaft furnace to reduce iron ore; a reforming furnace filled with a lot of expensive catalysts does not need to be constructed so that a system is simplified and the maintenance cost is low. All sensible heat of the pyrolyzed crude gas with the temperature of 700 to 900 DEG C is directly and sufficiently utilized andthe energy source utilization efficiency is remarkably improved; a pyrolyzed crude gas separation and purification system is not arranged and the reforming furnace filled with the catalysts does not need to be constructed, so that the system is simple and the investment is small; meanwhile, the utilization value of sponge iron is also improved, the subsequent melting cost of the sponge iron is reduced and coke tar treatment and dust treatment procedures are also reduced.

Description

technical field [0001] The invention relates to the field of chemical metallurgy, and relates to a device for producing reducing gas in a gas-based shaft furnace. [0002] It also relates to a method for producing reducing gas in a gas-based shaft furnace. Background technique [0003] Low-rank coals such as lignite and long-flame coal have the characteristics of high volatile content and strong activity. Because of their high moisture and oxygen content and low calorific value, direct combustion or gasification utilization efficiency is low, and their economic value is far inferior to high-rank coal. Therefore, large-scale development of low-rank coal must be processed and upgraded before it can be better utilized. Pyrolysis treatment is one of the most scientific and effective methods to deal with low-rank coal. Pyrolysis is often said to refer to a series of physical changes and chemical reactions that occur when coal is continuously heated to a higher temperature in is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B47/24C10K3/02C21B13/00C21B13/02
CPCC10B53/04C10B47/24C10K3/02C21B13/0073C21B13/02
Inventor 范志辉郭新颖季爱兵刘安治雷华
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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