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Separating technique and apparatus for preparing liquefied natural gas from coke oven gas

A technology for liquefied natural gas and coke oven gas, applied in refrigeration and liquefaction, lighting and heating equipment, liquefaction, etc., to achieve the effect of process operation, simple structure and easy process flow

Inactive Publication Date: 2009-06-24
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no liquefaction separation process and equipment for producing liquefied natural gas from coke oven gas (tail gas) or concentrated coke oven gas (such as tail gas after hydrogen extraction)

Method used

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  • Separating technique and apparatus for preparing liquefied natural gas from coke oven gas
  • Separating technique and apparatus for preparing liquefied natural gas from coke oven gas
  • Separating technique and apparatus for preparing liquefied natural gas from coke oven gas

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1 is a schematic diagram of a process flow for liquefaction and separation of coke oven gas (tail gas) using a gas expansion refrigeration cycle. Such as figure 1 As shown, the set of equipment mainly includes raw material gas compression equipment, refrigeration equipment and liquefaction separation equipment, wherein the refrigeration equipment is gas expansion refrigeration equipment, and the liquefaction separation equipment includes heat exchanger groups in which heat exchangers 5, 6, and 7 are connected in sequence and fractionation The tower 9, the raw material gas compression equipment and the liquefaction separation equipment are connected through pipelines, and the raw material gas heat exchanger is connected with the refrigeration equipment through refrigeration pipelines. The heat exchanger group in the present invention is provided with 3 heat exchangers, and a suitable number of heat exchangers is selected according to actual needs in the projec...

Embodiment 2

[0031] Embodiment 2 is a flow chart of the liquefaction and separation of coke oven gas (tail gas) using a mixed working medium refrigeration cycle. The difference between the liquefaction separation equipment and the first embodiment is that the refrigeration equipment is a mixed working fluid refrigeration equipment. Wherein, the process of compression, liquefaction and separation of coke oven gas (tail gas) is the same as that of Embodiment 1. Only in the selection of the top condenser 23 of the fractionating tower, whether to choose or not depends on the user's requirements for methane content in the tail gas after the coke oven gas (tail gas) is separated; and the position of the coke oven gas (tail gas) expander 11 depends on the system It depends on the requirement of heat balance calculation.

[0032] Since the refrigeration cycle adopts a mixed working medium refrigeration cycle with low energy consumption, the mixed working medium enters the gas-liquid separator 26 af...

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Abstract

The invention relates to a separation process of coke gas prepared liquid natural gas and equipment thereof. The separation process mainly comprises the following steps: compression and cooling of coke gas feed gas, heat exchange in a heat exchanger set, liquid natural gas obtainment through fractionating in a fractioning tower and the like. The invention also provides the separation equipment of the coke gas prepared liquid natural gas, and comprises feed gas compression equipment, refrigeration equipment and liquefying separation equipment, wherein, the liquefying separation equipment comprises a heat exchanger and the fractionating tower which are connected in sequence; the feed gas compression equipment is connected with the liquefying separation equipment; and a refrigerating pipeline of a feed gas heat exchanger is connected with the refrigeration equipment. The invention provides the method of low-temperature fractionation liquefaction according to the status quo of coke gas utilization in China, which separates methane from the coke gas to prepare the liquid natural gas, so that the added value of the coke gas is greatly increased, while an LNG product can be conveniently transported and utilized, and the whole liquefying separation process has the advantages of easy operation and simple equipment.

Description

technical field [0001] The invention relates to a gas liquefaction separation process and equipment, in particular to a separation process and equipment for producing liquefied natural gas by using coke oven gas. Background technique [0002] my country is the world's largest producer, consumer and exporter of coke. In 2004, the coke output was 224 million tons, accounting for 56% of the global output. At the same time, more than 70 billion cubic meters of coke oven gas (tail gas) were produced. Half of the coke oven gas is used to return to the furnace to support combustion, and the other half needs to be recovered by a special device. Since my country's coking industry only focuses on coke production and ignores the recovery of chemical products, a large amount of coke oven gas (tail gas), the main by-product of coking production, is directly burned and released-commonly known as "lighting sky lanterns". The resulting economic losses amounted to tens of billions of dollar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10K3/00F25J1/00
CPCF25J3/0219F25J3/0233F25J3/0252F25J2200/70F25J2210/14F25J2215/04F25J2230/30F25J2270/04F25J2270/14F25J2270/16F25J2270/18F25J2270/42F25J2270/66F25J2290/34
Inventor 张武任小坤王文川陆文军高元景孙郁王晓烨
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI