Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for producing gas-based directly reduced iron by utilizing non-catalytic conversion of coke-oven gas, and system thereof

A coke oven gas, non-catalytic technology, applied in the direction of furnaces, shaft furnaces, furnace types, etc., can solve the problems of high energy consumption, low unsafe utilization of methane, high sulfur content of reduced iron, etc., and achieve high effective gas content, Good energy saving and high iron reduction rate and reduction speed effect

Active Publication Date: 2014-01-22
CHINA UNIV OF PETROLEUM (BEIJING) +1
View PDF11 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent application CN102605132A discloses a method of using coke oven gas to produce direct reduced iron. In this method, the coke oven gas does not have fine desulfurization and a dedicated catalytic conversion process. The coke oven gas enters the reduction furnace after heating, and the reduced iron contains sulfur. The amount of methane in coke oven gas is high, and the utilization rate of methane in coke oven gas is low due to unsafe conversion
[0007] Chinese patent application CN101392192B discloses a coke oven gas carbon dioxide conversion and gas-based shaft furnace direct reduction iron production method. In this application, after the coke oven gas is deeply purified and desulfurized, oxygen, carbon dioxide and water vapor are added as gas conversion agents. Too much water vapor is added to the gas, after the conversion, it needs to be cooled to 40°C for dehydration treatment, and then the temperature is raised into the base shaft furnace. This process leads to high energy consumption due to the cooling and heating process of high-temperature syngas

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
  • Method for producing gas-based directly reduced iron by utilizing non-catalytic conversion of coke-oven gas, and system thereof
  • Method for producing gas-based directly reduced iron by utilizing non-catalytic conversion of coke-oven gas, and system thereof
  • Method for producing gas-based directly reduced iron by utilizing non-catalytic conversion of coke-oven gas, and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This example provides a system for producing gas-based direct reduced iron by non-catalytic conversion of coke oven gas, the structure of which is as follows figure 1 shown. The system includes a purifier 1, a first fine desulfurization tower 2, a reformer 3, a gas mixer 4, a shaft furnace 5, a scrubber 6, a second fine desulfurization tower 7, a decarburization tower 8, and a heater 9, wherein:

[0055] The purifier 1 is provided with a coke oven gas input port, and its outlet is connected with the first fine desulfurization tower 2;

[0056] The first fine desulfurization tower 2 is equipped with CO 2 / H 2 O inlet, its outlet is connected with reforming furnace 3, and other gas input pipelines are provided on the connecting pipeline of the two;

[0057] The gas mixer 4 is respectively provided with an oxygen-containing gas inlet and a CO 2 / H 2 O inlet, its outlet is connected with reforming furnace 3;

[0058] The outlet of reforming furnace 3 is connected with...

Embodiment 2

[0068] This embodiment provides a method for producing gas-based direct reduced iron by non-catalytic conversion of coke oven gas, which includes the following steps, and its process is as follows figure 2 As shown, you can use figure 1 The system shown:

[0069] The flow rate of raw coke oven gas is 22500Nm 3 / h, wherein, by volume ratio, the methane content is about 20%, the hydrogen content is about 60%, and the rest is a small amount of CO 2 , CO, N 2 and C 2 + components, the total sulfur content is less than 300ppm;

[0070]The raw coke oven gas enters the purifier 1 and undergoes dedusting, deoiling and compression, then heats up to 200°C, and enters the first fine desulfurization tower 2 under a pressure of 1.2MPa, which is the fine desulfurization reactor for hydrogen adsorption desulfurization. There are two reactors in total, one can be opened and the other can be regenerated, and it can also be used in series and parallel. The fine desulfurizer contains 15wt...

Embodiment 3

[0077] This embodiment provides a method for producing gas-based direct reduced iron by non-catalytic conversion of coke oven gas, which includes the following steps, and its process is as follows image 3 Shown:

[0078] The flow rate of raw coke oven gas is 26000Nm 3 / h, wherein, in terms of volume ratio, the content of methane is about 25%, the content of hydrogen is about 56%, and a small amount of CO 2 , CO, N 2 and C 2 + components, the total sulfur content is less than 350ppm;

[0079] After dust removal, deoiling and compression, the raw coke oven gas is heated up to 300°C by heat exchange, and enters the hydrogen adsorption fine desulfurization reactor under a pressure of 1.0 MPa. Two reactors are used, one can be opened and the other can be regenerated, or Used in series and parallel, each equipped with hydrogen adsorption fine desulfurizer 56m 3 (The hydrogen adsorption fine desulfurizer is CUPB-XTS series hydrogen adsorption desulfurizer, produced by Dongying...

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

No PUM Login to View More

Abstract

The invention relates to a method for producing gas-based directly reduced iron by utilizing the non-catalytic conversion of a coke-oven gas, and a system thereof. The method comprises the following steps: mixing the coke-oven gas obtained after routine purification and fine desulfurization treatment with a mixed gas comprising one or above two of a converter gas, a blast furnace gas and a purified tail gas to form a raw material gas mixture, and partially combusting the raw material gas mixture and an oxygen-containing gas at a converter burner outlet at a controlled flame temperature of 1100-2300DEG C for the conversion of hydrocarbons in the coke-oven gas and carbon dioxide or water vapor to generate a synthetic gas containing H2 and CO; and allowing the synthetic gas containing H2 and CO to enter a shaft furnace and reduce iron oxide in order to produce reduced iron, and cooling, washing, decarburizing, desulphurizing and purifying a reduced tail gas discharged from a shaft furnace to obtain a purified tail gas. The invention also provides a system for producing the gas-based directly reduced iron by utilizing the non-catalytic conversion of the coke-oven gas.

Description

technical field [0001] The invention relates to a method and system for producing gas-based direct reduced iron by non-catalytic conversion of coke oven gas, belonging to the technical field of direct reduced iron production. Background technique [0002] Direct reduced iron (DRI), also known as sponge iron, is a kind of metallic iron obtained without blast furnace smelting. The process of producing DRI is called non-blast furnace ironmaking process. The production process of DRI is divided into two types: coal-based and gas-based. At present, the gas-based method accounts for 90% of the output of DRI. The typical processes are tank method (HYL method) and shaft furnace method (Midrex method). The shaft furnace method uses a vertical moving bed reduction reactor, which is mainly divided into two parts: Reduction zone, where reducing gas circulates at high temperature, hydrogen and carbon monoxide above 800°C reduce iron oxide to generate DRI, hydrogen and carbon monoxide ge...

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): C21B13/02C21B13/14
CPCY02P10/20
Inventor 周红军余长春李然家周广林吴全贵
Owner CHINA UNIV OF PETROLEUM (BEIJING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products