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A method and device for producing reduced iron using gas-to-synthesis gas

A gas and synthesis gas technology, applied in the direction of reducing gas emissions, furnace types, furnaces, etc., can solve problems such as technical reports of unseen production processes and processes, and achieve improved utilization value and efficiency, improved economic benefits, and reduced Effect of nitrogen content

Active Publication Date: 2016-02-17
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] After investigation, there is no technical report on the technology and process of using gas in the production of reduced iron

Method used

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  • A method and device for producing reduced iron using gas-to-synthesis gas
  • A method and device for producing reduced iron using gas-to-synthesis gas
  • A method and device for producing reduced iron using gas-to-synthesis gas

Examples

Experimental program
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Effect test

Embodiment 1

[0048] See figure 1 As shown, this embodiment provides a device for producing reduced iron by using gas-to-synthesis gas, which mainly includes a gas dust collector 1, a first desulfurization tower 2, and a reformer 3 connected in series through pipelines and gas-based shaft furnace 4 and other equipment, and also include a first gas mixer 5 arranged on the pipeline between the gas dust collector 1 and the first desulfurization tower 2 and / or arranged between the first desulfurization tower 2 and the reformer 3 The second gas mixer 6 on the intermediate pipeline. in:

[0049] The gas dust collector 1 is provided with a gas inlet and a gas outlet after dedusting; the gas deduster is used to perform dedusting and other purification treatments on the gas to obtain dedusted gas;

[0050] The first gas mixer 5 is provided with a dust-removed gas inlet, a natural gas inlet and a gas outlet; the first gas mixer is used to mix the dust-removed gas with natural gas to obtain a gas mi...

Embodiment 2

[0067] See figure 2 shown, with figure 1 Compared with the shown device, the device of the present invention for producing reduced iron by using gas-to-synthesis gas can further include a top gas purification system 8 of a gas-based shaft furnace (see figure 2 The part indicated by the dotted line in the middle), the top gas purification system 8 includes a washing tower 81, a second desulfurization tower 82, and a pressure swing adsorption tower 83 connected in series through pipelines; wherein:

[0068] The scrubber 81 is provided with a top gas inlet and a washed tail gas outlet, and the top gas inlet is connected to the top gas outlet of the gas-based shaft furnace 4; the scrubber is used to clean the top gas from the gas-based shaft furnace Perform washing (mainly dust removal) to obtain exhaust gas after washing;

[0069] The second desulfurization tower 82 is provided with a washed tail gas inlet and a desulfurized tail gas outlet, and the washed tail gas inlet is c...

Embodiment 3

[0076] This example provides a medium-nitrogen gas supplemented with natural gas with a methane content of about 50% and non-catalytic partial oxidation of steam to produce synthesis gas combined with reducing tail gas pressure swing adsorption separation N 2 and CO 2 For the process of producing DRI, see image 3 shown.

[0077] Raw material coal mine gas 10000Nm 3 / h, of which methane is about 50%, oxygen is about 10%, nitrogen is about 37%, and a small amount of CO 2 etc., the total sulfur content is less than 150mg / Nm 3 ;Raw materials are mixed with 5000Nm after dedusting 3 / h natural gas, heat up to 350°C, pressure 0.7MPa, enter the medium temperature zinc oxide fine desulfurization reactor, using two reactors,

[0078] Medium-temperature zinc oxide refined desulfurizer (manufactured by Dongying Keerte New Material Co., Ltd.) 20m 3 , one opening and one regeneration; the total sulfur of the mixed gas passing through the fine desulfurization reactor is less than 0.1p...

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Abstract

The invention provides a method and a device for producing reduced iron by using synthesis gas prepared from gas. The method comprises the following steps: (1) purifying the gas, mixing the purified gas with steam and / or natural gas so as to form a gas mixture which deviates from an explosion limit; (2) converting the gas mixture and oxygen-containing gas or CO2 in a converter so as to generate the synthesis gas containing H2, CO and N2, specifically, the conversion of the gas mixture and the oxygen-containing gas in the converter refers to the partial burning of the gas mixture and the oxygen-containing gas at a nozzle outlet of the converter, and controlling flame temperature to 900-1700 DEG C during burning; and controlling the temperature of the synthesis gas at an outlet of the converter to 850 DEG C-1300 DEG C and the pressure of the synthesis gas to 0.1-0.5Mpa; and (3) enabling the synthesis gas containing H2, CO and N2 serving as all or partial reducing gas to enter a gas-base shaft furnace so as to reduce ferric oxide, so that the reduced ion is generated. The method and the device have the advantages that the utilization value of the gas is increased, and the utilization efficiency of the gas is improved.

Description

technical field [0001] The invention relates to a method and device for producing reduced iron by utilizing gas gas to synthesize gas. 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. Among them, the gas-based method currently accounts for 90% of the output of DRI. The typical processes are the tank method (HYL method) and the 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 generate water and carbon dioxide; and a cold zone located at the lower par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/02
CPCY02P10/143
Inventor 周红军余长春李然家周广林吴全贵
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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