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Process for removing oil and water from gas and recycling oil by adopting low-temperature methanol

A low-temperature methanol and methanol-water separation tower technology is applied in the purification of liquid scrubbing gas, the purification of condensed non-gaseous material gas, and energy input. , The effect of high gas purification and increasing added value

Inactive Publication Date: 2017-01-11
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production of large coal chemical plants and coking plants, it is often necessary to dehydrate and deoil process gases such as water gas, crude gas, and coke oven gas. The electric tar capture process can handle small amounts of coke oven gas. Dehydration cannot be taken into account, and the equipment investment is too large and the operation is cumbersome
At this time, the general deoiling method and dehydration measures become difficult to implement

Method used

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  • Process for removing oil and water from gas and recycling oil by adopting low-temperature methanol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment 1, the crude gas flow rate is 122000Nm 3 / h (111900kg / h), temperature: 25°C, pressure: 30bar, oil content: 0.079wt%, water 0.02wt%.

[0038] The crude gas is sprayed into 400kg / h of methanol first to prevent the water in the feed gas from freezing at low temperature, and then enters the feed cooler 1, and then the crude gas is cooled to -30°C and enters the oil removal tower 2. The temperature of the 3600kg / h methanol sprayed on the top of the tower is -30℃. After deoiling treatment under the pressure of 30bar, the deoiled gas exits the device from the top of the tower, and the low-temperature oily methanol is filtered from the bottom of the deoiling tower 2 through methanol The dirty methanol after dust removal by filter 3 enters the secondary flash washing tower 4.

[0039] In the secondary flash scrubber 4, the operating pressure of the medium-pressure flash section is 9 bar, and the operating temperature is -30°C. The flash liquid is heated to -5...

Embodiment 2

[0042] In this embodiment 2, the crude gas flow rate is 440000Nm 3 / h (420000kg / h), temperature: 25°C, pressure: 45bar, oil content: 0.050wt%, water 0.016wt%

[0043] This embodiment is identical with embodiment 1 step, and concrete operation parameter changes as follows

[0044] Before the crude gas enters the desulfurized gas and enters the feed cooler 1, 1600kg / h of methanol at -27°C is sprayed into the deoiling tower 2, and 11400kg / h of methanol is sprayed at the top of the tower.

[0045] In the secondary flash tower 4, after the first-stage flash, the pressure is reduced to 10 bar, and the temperature is reduced to -25°C. After being heated to -5°C by the flash heater 5, the decompression flash is continued, and the pressure is controlled in the second stage. is 2bar, at this time the flash temperature reaches -20°C,

[0046] The operating temperature of the oil-water extractor 6 is 35° C., and the pressure is maintained at 2 bar.

[0047] The oil separation tower hea...

Embodiment 3

[0052] In this embodiment 3, the crude gas flow rate is 515000Nm 3 / h(495000kg / h), temperature: 20°C, pressure: 60bar, oil content: 0.39wt%, water content: 0.018wt%

[0053] This embodiment is identical with embodiment 1 step, and concrete operation parameter changes as follows

[0054] Before the crude gas enters the desulfurized gas into the feed cooler 1, it is sprayed with 2000kg / h of methanol

[0055] Enter the deoiling tower 2, spray 15000kg / h of methanol at the top of the tower to remove oil.

[0056] In the secondary flash tower 4, after the first stage of flash evaporation, the pressure is reduced to 11bar, and the temperature is reduced to -20°C. After being heated to 0°C by the flash heater 5, the decompression flash is continued. In the second stage, the pressure is controlled to be 3bar, at this time the flash temperature reaches -5°C,

[0057] The operating temperature of the oil-water extractor 6 is 30° C., and the pressure is maintained at 3 bar.

[0058] T...

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Abstract

The invention discloses a process for removing oil and water from a gas and recycling oil by adopting low-temperature methanol. According to the process, an oil-containing and water-containing feed gas enters an oil removal tower to remove the oil from the oil-containing and water-containing feed gas through the low-temperature methanol; low-temperature oil-containing methanol from the oil removal tower enters a secondary flash evaporation washing tower and is subjected to intermediate pressure flash evaporation and low-pressure flash evaporation; a liquid phase which is subjected to the flash evaporation enters an oil and water extractor for extracting; an oil phase serves as a product; after the water into which a small amount of the oil is dissolved is treated through an oil separating tower, a non-condensable gas at the top of the tower enters the a secondary flash evaporation tower; the oil at the upper part of the tower enters the oil and water extractor; water-containing methanol is obtained at the bottom of the tower and enters a methanol separating tower for separating; the methanol returns to the oil removal tower; part of the water at the bottom of the tower is recycled as an extracting agent, and the other part of the water is delivered outside as superfluous water. The process has the advantages that washing gas water is not produced, coal gas waste heat energy can be recycled and utilized in grades, and meanwhile, different grades of steam can be generated.

Description

technical field [0001] The invention belongs to an oil-removing process of oil-containing gas, in particular to a method for using low-temperature methanol to remove oil and water from gas and recover oil. Background technique [0002] In the production of large coal chemical plants and coking plants, it is often necessary to dehydrate and deoil process gases such as water gas, crude gas, and coke oven gas. The electric tar capture process can handle small amounts of coke oven gas. Dehydration cannot be taken into account, and the device investment is too large and the operation is cumbersome. At this time, the general deoiling method and dehydration measures become difficult to implement. The invention is a process for deoiling and dehydrating the above-mentioned process gas, which can deoil the oil-containing gas and realize the purpose of oil recovery. Contents of the invention [0003] The purpose of the present invention is to provide a gas deoiling and dehydration ...

Claims

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Application Information

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IPC IPC(8): C10K1/04C10K1/08
CPCC10K1/04C10K1/08Y02P20/129
Inventor 王乔毅李晓张琦宇周恩利李刚王贵关杰张凤娟尚淑娟刁秀辉吴湘楠
Owner SEDIN ENG
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