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Method and device for producing reduced iron through synthetic gas prepared from high-nitrogen content retort gas

A technology for dry distillation of gas and high nitrogen content, which is applied in the direction of catalytic treatment of combustible gas, gas dust removal, combustible gas purification, etc. The effect of avoiding loss

Active Publication Date: 2014-05-21
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] After investigation, there is no technical report on the technology and process of using dry distillation gas for the production of reduced iron

Method used

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  • Method and device for producing reduced iron through synthetic gas prepared from high-nitrogen content retort gas
  • Method and device for producing reduced iron through synthetic gas prepared from high-nitrogen content retort gas
  • Method and device for producing reduced iron through synthetic gas prepared from high-nitrogen content retort gas

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Embodiment 1

[0058] See figure 1 As shown, in this embodiment, a device for producing reduced iron by using carbonized coal gas with high nitrogen content to produce syngas is provided. The device mainly includes a dry distillation gas purifier 1, a first desulfurization tower 2, The first heat exchanger 3, the reforming converter (reforming conversion reactor) 4 and the gas-based shaft furnace 5, wherein:

[0059] The retort gas purifier 1 is provided with a retort gas inlet and a purified gas outlet; the retort gas purifier is used to purify the retort gas to remove dust and remove heavy hydrocarbons to obtain purified gas;

[0060] The first desulfurization tower 2 is provided with a purified gas inlet and a desulfurized gas outlet, and the purified gas inlet is connected to the purified gas outlet of the dry distillation gas purifier; Sulfur content below 10ppm;

[0061] The first heat exchanger 3 is provided with a desulfurization gas inlet and a heating gas outlet, and the desulfur...

Embodiment 2

[0070] See figure 2 shown, with figure 1 Compared with the shown device, the device of the present invention for producing reduced iron by utilizing carbonized coal gas with high nitrogen content to produce reduced iron can further include a top gas purification system 7 of a gas-based shaft furnace (see figure 2 The part indicated by the dotted line in the middle), the top gas purification system 7 includes a scrubber 71, a second desulfurization tower 72, and a pressure swing adsorption tower 73 connected in series through pipelines; wherein:

[0071] The scrubber 71 is provided with a top gas inlet and a washed tail gas outlet, and the top gas inlet is connected with the top gas outlet of the gas-based shaft furnace 5; 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;

[0072] The second desulfurization tower 72 is provided with a tail gas inlet after washing and an outle...

Embodiment 3

[0078] This embodiment provides a kind of nitrogen-containing about 39% semi-coke dry distillation gas supplemented with steam catalytic conversion combined with reduction tail gas pressure swing adsorption separation N 2 and CO 2 The method of producing DRI reduced iron, the reference of the equipment used figure 2 Shown, the process flow see image 3 shown.

[0079] Raw material blue carbon dry distillation gas 160000Nm 3 / h, of which hydrogen is about 31%, methane is about 8%, carbon monoxide is 10%, carbon dioxide is about 10%, nitrogen is about 39%, and a small amount of C 2 +, oxygen and saturated water components. The total sulfur content is less than 50mg / Nm 3 ; After the raw material is dedusted and de-heavy hydrocarbons, 70 tons of iron oxide at room temperature (produced by Shandong Dongying Kerte New Material Co., Ltd.) is used for desulfurization and purification, and the total sulfur content is reduced to about 1ppm. The gas is heated up to 550°C by heat ...

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Abstract

The invention provides a method and device for producing reduced iron through synthetic gas prepared from high-nitrogen content retort gas. The method comprises the steps of purifying and desulfurizing the high-nitrogen content retort gas until the sulfur content thereof is smaller than or equal to 10ppm; heating the desulfurized retort gas to the temperature of 300 DEG C to 650 DEG C as to-be-transformed gas, or adding part of superheated steam into the retort gas according to the constitution of the retort gas as the to-be-transformed gas; leading the to-be-transformed gas into a reforming furnace which contains a catalyst to transform the to-be-transformed gas on the catalyst so as to obtain the synthetic gas containing H2, CO and N2; taking the synthetic gas formed after the transformation as completely or partially-reduced gas, and directly sending the synthetic gas into a gas-based shaft furnace to reduce iron oxide so as to produce the reduced iron. After the N2, CO2 and sulfide are removed, the tail gas at the furnace top can be returned to the shaft furnace to be recycled as reducing gas. The method and the device disclosed by the invention are used for improving the use values and efficiency of the retort gas and realizing an effect and an aim of producing the reduced iron by taking the natural gas as a raw material.

Description

technical field [0001] The invention relates to a method and a device for producing reduced iron by using dry distillation coal gas with high nitrogen content to produce synthetic 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...

Claims

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Application Information

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IPC IPC(8): C21B13/02C10K1/00C10K1/02C10K3/02
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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