CN215138328U - Tail gas recovery device of methyl ethyl ketone rectifying device - Google Patents
Tail gas recovery device of methyl ethyl ketone rectifying device Download PDFInfo
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- CN215138328U CN215138328U CN202121030167.4U CN202121030167U CN215138328U CN 215138328 U CN215138328 U CN 215138328U CN 202121030167 U CN202121030167 U CN 202121030167U CN 215138328 U CN215138328 U CN 215138328U
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Abstract
The utility model belongs to the technical field of VOCS exhaust-gas treatment, mainly relate to methyl ethyl ketone rectifier unit tail gas recovery unit. The device comprises a centralized cooling part, a sedimentation gas-liquid layering part and a compression part, wherein the centralized cooling part comprises a cooler, the sedimentation gas-liquid layering part comprises an oil-gas separator, and the compression part comprises a first compressor and a second compressor. The comprehensive technology of cooling, settling gas-liquid layering, pressurizing compression, full combustion and VOCS detection emptying is adopted to recycle the waste gas, so that the problems of safety and environmental protection are solved, energy waste is avoided, and natural gas is saved.
Description
Technical Field
The utility model belongs to the technical field of VOCS exhaust-gas treatment, mainly relate to methyl ethyl ketone rectifier unit tail gas recovery unit.
Background
The methyl ethyl ketone device utilizes refinery ether rear carbon four as a raw material, 1-butylene and 2-butylene are extracted through methanol recovery and carbon four separation in sequence, sec-butyl alcohol is generated through a direct hydration method of butylene, the sec-butyl alcohol is separated and purified, and finally methyl ethyl ketone is prepared through sec-butyl alcohol gas phase dehydrogenation separation and purification. However, the raw material is carbon four, and the atmospheric tower is designed to release much carbon four, so carbon-containing organic matters are generated in the production process of each unit and are directly discharged to the atmosphere at the top of the atmospheric rectifying tower, thereby causing resource waste and environmental pollution.
The low-pressure emptying of the process mainly comprises six parts, the components mainly comprise carbon-four liquefied gas, and a small amount of organic matters and water are mixed in the carbon-four liquefied gas; the prior art has dominated direct atmospheric and high point emissions. The risk of the C-IV liquefied gas belongs to the class A, and the C-IV liquefied gas is directly discharged on site, and causes great accident potential to production operation in thunderstorm seasons; meanwhile, the combustion value of the carbon-four liquefied gas is about 1.5 times of that of natural gas, and the direct discharge causes atmospheric pollution and energy waste.
At present, VOCS waste gas treatment technologies are many, and six methods are mainstream: the thermal combustion method discharges organic matters in waste gas into a torch for combustion, so that the method causes resource waste, is suitable for causing insufficient combustion, and is not easy to control the content of discharged nitric oxide exceeding the standard; the catalytic combustion method oxidizes the waste into harmless substances under the action of an oxidation catalyst, but the cost of the catalyst is high; the adsorption method, which transfers the waste gas from gas phase to solid phase by using the adsorption function of the adsorbent, has high purification efficiency, but the adsorbent has high cost, limited adsorption capacity and high regeneration difficulty; the low-temperature plasma technology is characterized in that in the dielectric barrier discharge process, particles with extremely high chemical activity are generated in plasma, and waste gas reacts with active groups with higher energy to be converted into CO2And H2O, the purification purpose is achieved, but the equipment investment cost is high, and the technology is not mature enough; the condensation method adopts low temperature and liquefaction recovery, and the technology has high purity required for components and low recovery rate.
SUMMERY OF THE UTILITY MODEL
To the not enough of prior art, the utility model provides a methyl ethyl ketone rectification plant tail gas recovery unit.
In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:
the utility model provides a tail gas recovery device of a methyl ethyl ketone rectification device, which comprises a centralized cooling part, a settling gas-liquid layering part and a compression part; the centralized cooling part comprises a cooler, and a feed line of the cooler is respectively communicated with a circulating process water azeotropic tower, an acetonitrile recovery tower feed buffer tank, an SBE tower reflux tank, a flushing water storage tank unit, an azeotropic tower top cooler and a waste gas outlet of a TBA tower top cooler; the sedimentation gas-liquid layering part comprises an oil-gas separator, an outlet of the cooler is communicated with an inlet of the oil-gas separator through a pipeline, the oil-gas separator is communicated with the compression part through a gas phase extraction line of the oil-gas separator, the bottom of the oil-gas separator is provided with an oil removal package, and an oil phase outlet of the oil removal package is connected with an oil phase extraction line; the compression part comprises a first compressor and a second compressor, the first compressor and the second compressor are respectively communicated with the oil-gas separator through an oil-gas separator gas phase extraction line, the first compressor and the second compressor are respectively communicated with the heating medium furnace process through compressor outlet lines, and the natural gas line and the liquefied petroleum gas line are respectively communicated with the compressor outlet lines.
Further, a compressor crossover line is arranged between the gas phase extraction line of the oil-gas separator and the outlet line of the compressor.
Further, the first compressor and the second compressor form a one-on-one-standby continuous operation system.
Furthermore, a VOCS (volatile organic Compounds) online monitoring system is arranged in the heat medium furnace process.
Adopt above-mentioned technical scheme, the beneficial effects of the utility model are that:
the utility model discloses according to the emission and the principal ingredients of waste gas, combine the prior art of methyl ethyl ketone, finally adopt the cooling-subside gas-liquid layering-pressure boost compression-abundant burning-VOCS detect the comprehensive technique of emptying and recycle waste gas, retrieved partial organic product, improve product output, solved safety ring and protection problem, avoided the energy waste simultaneously, practice thrift the natural gas.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic configuration diagram of a tail gas recovery apparatus of a methyl ethyl ketone rectification apparatus according to embodiment 1;
the respective symbols in the figure are as follows: (1) circulating the process water azeotropic tower; (2) circulating the process water azeotropic tower; (3) an acetonitrile recovery tower; (4) feeding a buffer tank of the acetonitrile recovery tower; (5) an SBE tower reflux drum and wash water storage tank unit; (6) an azeotropic tower top cooler; (7) a TBA tower top cooler; (8) a cooler; (9) an oil-gas separator; (10) removing oil; (11) a deoiling packet production line; (12) a gas phase extraction line of the oil-gas separator; (13) a first compressor; (14) a second compressor; (15) a compressor crossover; (16) a compressor outlet line; (17) a natural gas line; (18) a liquefied petroleum gas line; (19) and (5) a heat medium furnace process.
Detailed Description
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
The present invention will be further explained with reference to the accompanying drawings.
As shown in FIG. 1, the present example provides a tail gas recovery device of a methyl ethyl ketone rectification device, which comprises a concentrated cooling part, a settling gas-liquid separation part and a compression part.
The centralized cooling part comprises a cooler 8, and the feed lines of the cooler are respectively communicated with the waste gas outlets of a circulating process water azeotropic tower 1, a circulating process water azeotropic tower 2, an acetonitrile recovery tower 3, an acetonitrile recovery tower feed buffer tank 4, an SBE tower reflux tank, a flushing water storage tank unit 5, an azeotropic tower top cooler 6 and a TBA tower top cooler 7.
The sedimentation gas-liquid layering part comprises an oil-gas separator 9, an outlet of the cooler is communicated with an inlet of the oil-gas separator through a pipeline, the oil-gas separator is communicated with the compression part through a gas phase extraction line 12 of the oil-gas separator, a deoiling package 10 is arranged at the bottom of the oil-gas separator, and an oil phase outlet of the deoiling package is connected with an oil phase extraction line 11.
The compression part comprises a first compressor 13 and a second compressor 14, and the first compressor and the second compressor are respectively communicated with the oil-gas separator through a gas phase extraction line of the oil-gas separator. The first compressor and the second compressor belong to ZW-1.2/0.1-0.54 oil-free lubrication tail gas compressors, and adopt a reciprocating piston compressor, wherein the volume flow (air inlet state) is as follows: 1.2m3Min, displacement: 72Nm3H, rated power: 4 kW. The first and second compressors are in communication with a heat medium furnace process 19 via compressor outlet lines 16, respectively, and the natural gas line 17 and the liquefied petroleum gas line 18 are in communication with the compressor outlet lines, respectively.
And a compressor crossover line 15 is arranged between the gas phase extraction line of the oil-gas separator and the outlet line of the compressor.
The cooler was cooled with 5 ℃ chilled brine using a semi-closed low temperature screw ice machine.
The standard heat load of the heat medium furnace is 600 ten thousand Kcal/hr, low nitrogen oxygen combustion is adopted, the VOCS system is used for on-line monitoring, the NO content of the flue gas discharged by the furnace body is 200-280mg/m3。
The concentration of waste gas in the circulating process water azeotropic tower top product is 4.76 percent, and the tower top amount is 2000 kg/h; the concentration of waste gas in the circulating process water azeotropic tower top product is 3.14 percent, and the tower top amount is 2000 kg/h; the concentration of waste gas in the acetonitrile recovery tower top product is 0.35 percent, and the tower top amount is 6500 kg/h; the concentration of waste gas in the product at the top of the feeding buffer tank of the acetonitrile recovery tower is 0.21 percent, and the amount at the top of the tower is 27000 kg/h; the concentration of waste gas in the top products of a SBE tower reflux tank and a washing water storage tank unit is 2.07 percent, and the tower top amount is 16000 kg/h; the concentration of waste gas in the top product of the cooler at the top of the azeotropic tower is 0.59 percent, and the tower top amount is 3000 kg/h; the concentration of waste gas in the top product of the cooler at the top of the TBA tower is 1.92 percent, and the tower top amount is 2000 kg/h.
The main component of the waste gas of the device is carbon four, and the daily emission is 650m3VOCS system on-line monitoring after recovery combustionThe NO content of the flue gas discharged by the body is 200-280mg/m3. The heat value of the natural gas is 8000-8500kcal/m3The heat value of carbon four is 10000-10800kcal/m3(ii) a The daily consumption of the natural gas is 9000m3The daily consumption of the natural gas is 8100m3Daily natural gas saving of 900m3And a large amount of natural gas energy is saved.
Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.
Claims (4)
1. A tail gas recovery device of a methyl ethyl ketone rectification device is characterized by comprising a centralized cooling part, a settling gas-liquid layering part and a compression part; the centralized cooling part comprises a cooler (8), and feed lines of the cooler (8) are respectively communicated with waste gas outlets of a circulating process water azeotropic tower (1), a circulating process water azeotropic tower (2), an acetonitrile recovery tower (3), an acetonitrile recovery tower feed buffer tank (4), an SBE tower reflux tank, a flushing water storage tank unit (5), an azeotropic tower top cooler (6) and a TBA tower top cooler (7); the sedimentation gas-liquid layering part comprises an oil-gas separator (9), an outlet of the cooler (8) is communicated with an inlet of the oil-gas separator (9) through a pipeline, the oil-gas separator (9) is communicated with the compression part through a gas phase extraction line (12) of the oil-gas separator, an oil removal bag (10) is arranged at the bottom of the oil-gas separator (9), and an oil phase outlet of the oil removal bag (10) is connected with an oil phase extraction line (11); the compression part comprises a first compressor (13) and a second compressor (14), the first compressor (13) and the second compressor (14) are respectively communicated with the oil-gas separator (9) through an oil-gas separator gas-phase extraction line (12), the first compressor (13) and the second compressor (14) are respectively communicated with a heat medium furnace process (19) through a compressor outlet line (16), and a natural gas line (17) and a liquefied petroleum gas line (18) are respectively communicated with the compressor outlet line (16).
2. A methyl ethyl ketone rectification plant tail gas recovery device according to claim 1, characterized in that a compressor crossover (15) is arranged between the gas phase extraction line (12) of the oil-gas separator and the compressor outlet line (16).
3. A methyl ethyl ketone rectification plant tail gas recovery device according to claim 1, characterized in that the first compressor (13) and the second compressor (14) form a one-on-one-standby continuous operation system.
4. A tail gas recovery device of a methyl ethyl ketone rectification device according to claim 1, characterized in that the heating medium furnace process (19) is provided with a VOCS on-line monitoring system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115414741A (en) * | 2022-07-27 | 2022-12-02 | 中材锂膜(宁乡)有限公司 | Waste gas recovery system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115414741A (en) * | 2022-07-27 | 2022-12-02 | 中材锂膜(宁乡)有限公司 | Waste gas recovery system and method |
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