Process for preparation of metallurgical reduction gas and co-production of liquefied natural gas through coke gas
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A technology for liquefied natural gas and coke oven gas, which is applied in refrigeration and liquefaction, liquefaction, carbon monoxide, etc., to achieve stable operation, expand the industrial chain, and high heat utilization
Active Publication Date: 2016-02-03
SOUTHWEST RES & DESIGN INST OF CHEM IND
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[0007] The purpose of the present invention is to propose a process for producing metallurgical reducing gas and co-producing liquefied natu
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Embodiment 1
[0038] A kind of technology that utilizes coke oven gas to produce metallurgical reduction gas to co-produce LNG, the concrete steps of described technology are as follows:
[0039] (1) Pre-purification
[0040] Coke oven gas flow rate is 32000Nm 3 / h, where, in terms of volume percentage, H 2 content of 57.2%, CO content of 6.8%, CH 4 The content is 24%, CO 2 The content is 2.6%, N 2 content of 5%, polycarbonate content of 3.6%, O 2 The content is 0.8%. Impurity content: benzene, toluene content about 3500mg / Nm 3 , the naphthalene content is about 200mg / Nm 3 , tar and dust content about 100mg / Nm 3 , the ammonia content is about 45mg / Nm 3 , H 2 S content about 200mg / Nm 3 , the organic sulfur content is about 250mg / Nm 3 , the ratio of the total volume percentage is 100%. The raw coke oven gas of this composition enters the pre-purification device at a temperature of 40°C and a pressure of 7kPa, and uses the adsorption of coke to reduce the tar content to 4mg / Nm 3 ...
Embodiment 2
[0056] A kind of technology that utilizes coke oven gas to produce metallurgical reduction gas co-production LNG, same as embodiment 1, wherein:
[0057] In step (1), the coke oven gas flow rate is 42000Nm 3 / h, where, in terms of volume percentage, H 2 content of 57.1%, CO content of 7%, CH 4 The content is 24%, CO 2 The content is 2.5%, N 2 content of 5%, polycarbonate content of 3.9%, O 2 The content is 0.5%. Impurity content: benzene, toluene content about 4000mg / Nm 3 , the naphthalene content is about 200mg / Nm 3 , tar and dust content about 120mg / Nm 3 , the ammonia content is about 48mg / Nm 3 , H 2 S content about 200mg / Nm 3 , the organic sulfur content is about 300mg / Nm 3 , the ratio of the total volume percentage is 100%. The raw coke oven gas of this composition has a temperature of 40°C and a pressure of 7kPa, and enters the pre-purification device, and uses the adsorption of coke to reduce the tar content to 4mg / Nm 3 Below, naphthalene content is reduced ...
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Abstract
The invention belongs to the technical field of preparation of metallurgical reduction gas, and relates to a method for preparing high methane gas through industrial exhaust gas containing carbon and hydrogen, in particular to a process for preparation of metallurgical reduction gas and co-production of liquefied natural gas through coke gas. According to the process, coke gas serving as a raw material is subjected to pre-purification to roughly remove impurities such as tar and naphthalene, then the processed coke gas is introduced into a gas tank for buffering, the buffered coke gas is introduced into a compressor for pressurizing, deep purification is conducted on the pressurized coke gas to remove tar and naphthalene, benzene and ammonia in the processed coke gas are removed via a TSA procedure, CO2, H2S and water are removed through liquefied pre-purification, then high H2 is obtained through membrane separation, residual gas enters a liquefaction unit, and separation is carried out to obtain carbon monoxide gas and byproduct liquid methane. Through the process, coke oven gas resources are fully utilized, and byproduct liquefied natural gas (LNG) is obtained while the metallurgical reduction gas is obtained, so that the economic benefits are obvious.
Description
Technical field [0001] The present invention is the field of metallurgical reduction gas production technology. It involves the method of qi -made gas -made gas -made gas -made gas -based gas -made gas -based gas -based gas -based gas -based gas -based gas. It is a process that uses coking furnace gas to restore metallurgy. Background technique [0002] Metallurgical reducing gas refers to a gas that can directly restore the metal compound (mainly contains CO and H 2 To.Metallurgical reduction gas can soften the temperature of the iron ore, restore the oxidized iron to obtain metal iron, and achieve non -coking ironmaking, and low carbon consumption, CO 2 Without emissions, the use of metallurgy to restore air -purifying iron is of great significance to reduce disposable mineral energy consumption and protect the environment. [0003] At present, the main source of metallurgy restoring gas is the reorganization of natural gas (the more representative of Midrex's natural gas-car...
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