CN104448068B - One utilizes cryogenic pump for ethylene polymerization step-up method - Google Patents
One utilizes cryogenic pump for ethylene polymerization step-up method Download PDFInfo
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- CN104448068B CN104448068B CN201410678686.XA CN201410678686A CN104448068B CN 104448068 B CN104448068 B CN 104448068B CN 201410678686 A CN201410678686 A CN 201410678686A CN 104448068 B CN104448068 B CN 104448068B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The present invention relates to one utilizes cryogenic pump to comprise the following steps for ethylene polymerization step-up method, the method: is (1) directly boosted by cryogenic pump by the liquid ethylene of the 0.6MPa being stored in low temperature spherical tank, 40 DEG C, obtains 1.5MPa, the liquid ethylene of 40 DEG C；The most described 1.5MPa, the liquid ethylene of 40 DEG C pass through gasifier gasification, obtain 1.5MPa, the gaseous ethylene of 40 DEG C；Described in a portion, 1.5MPa, the gaseous ethylene of 40 DEG C return in described low temperature spherical tank, and described in remainder, 1.5MPa, the gaseous ethylene of 40 DEG C are then sent in superheater；(3) water-coal-slurry is sent into described superheater, and carried out thermal response with the gaseous ethylene of the described 1.5MPa in described superheater, 40 DEG C, respectively obtain 1.5MPa, the gaseous ethylene of 20 DEG C and cooling water backwater；Described cooling water backwater is discharged through described superheater discharge outlet；The most described 1.5MPa, the gaseous ethylene of 20 DEG C enter polymerized unit after being discharged by surge tank.Present invention process process simplification, simple to operate and energy consumption is low.
Description
Technical field
The present invention relates to the technical field of polyethylene device liquid ethylene boosting gasification, particularly relate to one and utilize cryogenic pump for ethylene polymerization step-up method.
Background technology
In existing polyethylene commercial plant, be stored in low temperature spherical tank liquid ethylene gasification boost process use method be: 0.6MPa, the liquid ethylene of-40 DEG C first pass through gasifier gasification become same equal pressure, at a temperature of gaseous ethylene, recycling superheater is superheated to 0.6MPa, the gaseous ethylene of 20 DEG C, finally utilize two stages of compression unit the gaseous ethylene of 0.6MPa, 20 DEG C is boosted to 1.5MPa, 40 DEG C, enter polymerized unit.The topmost weak point of the method is to use two stages of compression unit energy consumption high, mainly power consumption, and minimum unit rated power needs megawatt at about 200kW, large-sized unit rated power.
Summary of the invention
The technical problem to be solved be to provide a kind of energy consumption low, simple to operate utilize cryogenic pump for ethylene polymerization step-up method.
For solving the problems referred to above, one of the present invention utilizes cryogenic pump for ethylene polymerization step-up method, comprises the following steps:
(1) the liquid ethylene of the 0.6MPa being stored in low temperature spherical tank ,-40 DEG C is directly boosted by cryogenic pump, obtain 1.5MPa, the liquid ethylene of-40 DEG C；
The most described 1.5MPa, the liquid ethylene of-40 DEG C pass through gasifier gasification, obtain 1.5MPa, the gaseous ethylene of-40 DEG C；Described in a portion, 1.5MPa, the gaseous ethylene of-40 DEG C return in described low temperature spherical tank, and described in remainder, 1.5MPa, the gaseous ethylene of-40 DEG C are then sent in superheater；
(3) water-coal-slurry (CWS) is sent into described superheater, and carried out thermal response with the gaseous ethylene of the described 1.5MPa in described superheater ,-40 DEG C, respectively obtain 1.5MPa, the gaseous ethylene of 20 DEG C and cooling water backwater (CWR)；Described cooling water backwater (CWR) is discharged through described superheater discharge outlet；
The most described 1.5MPa, the gaseous ethylene of 20 DEG C enter polymerized unit after being discharged by surge tank.
Described step (1) in cryogenic pump be electromagnetic shielding type pump.
Described step (2) in gasifier and described superheater be finned tube exchanger or shell-and-tube heat exchanger, it adds thermal medium is any one in air, saturated vapor, superheated steam, high-temperature-hot-water, conduction oil.
The present invention compared with prior art has the advantage that
1, energy consumption reduces.
Present invention liquid ethylene cryogenic pump boost process replaces gaseous ethylene two stages of compression unit boost process in prior art, under equal operating condition, two stages of compression unit power and cryogenic pump power are 10 times of relations, such as 10,000 tons/year of polyethylene devices, when using cryogenic pump, power is 37kW, when using two stages of compression unit, power is 200kW, therefore uses liquid ethylene cryogenic pump boost process, can be substantially reduced power consumption.
2, technological process simplify, simple to operate.
In the present invention, cryogenic pump is single device, and form is electromagnetic shielding type pump, simple in construction, without auxiliary device and other annex, controls simple；And two stages of compression unit structure is complicated in prior art, needs the auxiliary devices such as front surge tank, rear surge tank, circulating air heat exchanger, control process the most complicated simultaneously.Therefore, by arranging cryogenic pump, shorten technological process, make simple to operate.
3, liquid-gas phase transition process of the present invention occurs in high pressure low temperature district, and boost process is that liquid phase is directly boosted, and volume is little, and consumed work is few；And liquid-gas phase transition process occurs in low-pressure low-temperature district in prior art, after phase transformation, gaseous phase volume increase is boosted again, and consumed work is many.
4, volume-diminished, saving space.
In the present invention, cryogenic pump volume is little, and floor space is few, saves space；And two stages of compression unit is bulky in prior art, need bigger installation site.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
Fig. 1 is the process chart of the present invention.
In figure: 1 low temperature spherical tank 2 cryogenic pump 3 gasifier 4 superheater 5 surge tank.
Detailed description of the invention
As it is shown in figure 1, one utilizes cryogenic pump for ethylene polymerization step-up method, comprise the following steps:
(1) the liquid ethylene of the 0.6MPa being stored in low temperature spherical tank 1 ,-40 DEG C is directly boosted by cryogenic pump 2, obtain 1.5MPa, the liquid ethylene of-40 DEG C.
Wherein: cryogenic pump 2 is electromagnetic shielding type pump.
(2) 1.5MPa, the liquid ethylene of-40 DEG C are gasified by gasifier 3, obtain 1.5MPa, the gaseous ethylene of-40 DEG C；A portion 1.5MPa, the gaseous ethylene of-40 DEG C return in low temperature spherical tank 1, and remainder 1.5MPa, the gaseous ethylene of-40 DEG C are then sent in superheater 4.
Wherein: gasifier 3 and superheater 4 are finned tube exchanger or shell-and-tube heat exchanger, it adds thermal medium is any one in air, saturated vapor, superheated steam, high-temperature-hot-water, conduction oil.
(3) water-coal-slurry (CWS) is sent into superheater 4, and carried out thermal response with the gaseous ethylene of the 1.5MPa in superheater 4 ,-40 DEG C, respectively obtain 1.5MPa, the gaseous ethylene of 20 DEG C and cooling water backwater (CWR)；Cooling water backwater (CWR) is discharged through superheater 4 discharge outlet.
(4) 1.5MPa, the gaseous ethylene of 20 DEG C enter polymerized unit after being discharged by surge tank 5.
Claims (2)
1. utilize cryogenic pump for an ethylene polymerization step-up method, comprise the following steps:
(1) the liquid ethylene of the 0.6MPa being stored in low temperature spherical tank (1) ,-40 DEG C is directly boosted by cryogenic pump (2), obtain 1.5MPa, the liquid ethylene of-40 DEG C；Described cryogenic pump (2) is electromagnetic shielding type pump；
The most described 1.5MPa, the liquid ethylene of-40 DEG C are gasified by gasifier (3), obtain 1.5MPa, the gaseous ethylene of-40 DEG C；Described in a portion, 1.5MPa, the gaseous ethylene of-40 DEG C return in described low temperature spherical tank (1), and described in remainder, 1.5MPa, the gaseous ethylene of-40 DEG C are then sent in superheater (4)；
(3) water-coal-slurry is sent into described superheater (4), and carried out thermal response with the gaseous ethylene of the described 1.5MPa in described superheater (4) ,-40 DEG C, respectively obtain 1.5MPa, the gaseous ethylene of 20 DEG C and cooling water backwater；Described cooling water backwater is discharged through described superheater (4) discharge outlet；
The most described 1.5MPa, the gaseous ethylene of 20 DEG C enter polymerized unit after being discharged by surge tank (5).
2. one as claimed in claim 1 utilizes cryogenic pump for ethylene polymerization step-up method, it is characterized in that: described step (2) in gasifier (3) and described superheater (4) be finned tube exchanger or shell-and-tube heat exchanger, it adds thermal medium is any one in air, saturated vapor, superheated steam, high-temperature-hot-water, conduction oil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410678686.XA CN104448068B (en) | 2014-11-24 | 2014-11-24 | One utilizes cryogenic pump for ethylene polymerization step-up method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410678686.XA CN104448068B (en) | 2014-11-24 | 2014-11-24 | One utilizes cryogenic pump for ethylene polymerization step-up method |
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| CN104448068A CN104448068A (en) | 2015-03-25 |
| CN104448068B true CN104448068B (en) | 2016-09-07 |
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| CN105179934B (en) * | 2015-09-16 | 2018-05-25 | 神华集团有限责任公司 | The real gas method of replacing and device of Propylene Spherical Tanks |
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| CN1869079A (en) * | 2005-05-27 | 2006-11-29 | 中国石油天然气股份有限公司 | Preparation method of linea low density polyethylene |
| CN103032861B (en) * | 2012-12-26 | 2014-07-16 | 天津乐金渤海化学有限公司 | Method for heating low-temperature liquid ethylene with water |
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