CN103994325B - Gas-liquid shunts the energy-saving low-temperature liquid ethylene gasifying process system of recovery mutually - Google Patents
Gas-liquid shunts the energy-saving low-temperature liquid ethylene gasifying process system of recovery mutually Download PDFInfo
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- CN103994325B CN103994325B CN201410186491.3A CN201410186491A CN103994325B CN 103994325 B CN103994325 B CN 103994325B CN 201410186491 A CN201410186491 A CN 201410186491A CN 103994325 B CN103994325 B CN 103994325B
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Abstract
The present invention discloses the energy-saving low-temperature liquid ethylene gasifying process system that a kind of gas-liquid shunts recovery mutually, pipeline of unloading a ship is connected to low temperature liquid ethene and unloads a ship between one end of arm and low temperature ethylene storage tank, the unload a ship the other end of arm of low temperature liquid ethene is connected with ethene transport-ship, and low temperature liquid ethene is transported in low temperature liquid ethene storage tank; Low temperature ethylene pump is arranged in low temperature liquid ethene storage tank, and economizer is connected with low temperature liquid ethene storage tank, and low temperature ethylene positive delivery is to economizer; Between the top that BOG compressor unit is connected to low temperature liquid ethene storage tank and economizer, pressure loading valve is connected with economizer, BOG in low temperature liquid ethene storage tank is condensed into ethene after compression in economizer, the ethene that this strand is condensed into enters pressure loading valve and is divided into gas, liquid two-phase, liquid phase is back to low temperature liquid ethene storage tank, and gas phase is back to the front end of BOG compressor unit; Ethene topping-up pump is connected between ethene vaporizer and economizer, gasifies and carry after being pressurized to the pressure of downstream user needs.
Description
Technical field
The present invention relates to Sweet natural gas field, specifically, it relates to a kind of gas-liquid shunts the energy-saving low-temperature liquid ethylene gasifying process system of recovery mutually.
Background technology
Ethene is one of the most important basic material of petrochemical industry. From the fifties in last century, the country of some petrochemical industry advanced technology develops hydrocarbon cracking technology in succession, and this facilitates the development of synthetic material industry greatly. At present, the general plastics such as polyethylene that hydrocarbons produces, polypropylene, vinylbenzene are utilized to spread all over the every nook and cranny of daily life. Along with the sustainable development of China's Petrochemical and national economy, the demand of ethene being continued to increase, domestic ethylene turnout can not satisfy the demands, thus needs a large amount of import.
The import of ethene adopts the mode of atmospheric low-temperature groove ship usually, liquid ethylene shipping is come back home. The volume of-104 DEG C of liquid ethylenes of the inferior weight of normal pressure is about under normal pressure the 1/490 of gaseous ethylene, the much smaller of the gaseous ethylene of the volume ratio equivalent weight of liquid ethylene under visible equipressure, thus accumulating liquid ethylene also just has more advantages than accumulating gaseous ethylene. After liquid ethylene shipping is come back home, need to be stored in liquid ethylene storage tank, when the demand obtaining downstream user indicates, by be arranged on that storage tank is outer and the liquid ethylene transferpump that is connected with storage tank to the liquid ethylene positive delivery in storage tank to gasifier, through the gasification of gasifier, the gaseous ethylene obtaining high pressure is carried and is used to downstream user.
The liquid ethylene temperature of low temperature very low (about-104 DEG C), the very big temperature difference (about 130 DEG C) is there is with envrionment temperature, therefore unloading a ship, pump pressurizes, Cemented filling, storage tank is deposited etc. in technological process, the heat of absorbing environmental can produce a large amount of boil-off gas (BOG, BoilOffGas), the composition of BOG is still ethene, if do not recycled, directly discharge, cause waste on the one hand, also the problem of environmental pollution can be brought in addition, especially at present day by day serious haze weather, ethene discharge needs strict limitation, therefore the key that BOG is the process system design of ethene receiving station how is rationally reclaimed.
The pressure that prior art generally adopts BOG compressor that the BOG of low temperature ethylene receiving station is directly compressed to downstream user needs carries out the outer defeated utilization of pipeline, it is called the outer defeated technique of directly compression, but owing to the pressure of BOG is very low, close to barometric point, therefore when outer defeated pressure is higher, the power consumption of compressor is very high, and equipment and the facility investment such as subsidiary pipeline, pipe fitting also will improve, and be not suitable for selecting. Therefore prior art exists when outer defeated pressure is higher, the technological deficiency that energy consumption is high.
Summary of the invention
The present invention provides the energy-saving low-temperature liquid ethylene gasifying process system that a kind of gas-liquid shunts recovery mutually, in order to overcome in prior art at least one problem existed.
For achieving the above object, the present invention provides the energy-saving low-temperature liquid ethylene gasifying process system that a kind of gas-liquid shunts recovery mutually, comprise: low temperature liquid ethene is unloaded a ship arm, pipeline of unloading a ship, low temperature liquid ethene storage tank, BOG compressor unit, economizer, pressure loading valve, ethene vaporizer, low temperature ethylene pump and ethene topping-up pump, wherein:
Described pipeline of unloading a ship is connected to described low temperature liquid ethene and unloads a ship between one end of arm and described low temperature ethylene storage tank, the unload a ship the other end of arm of described low temperature liquid ethene is connected with ethene transport-ship, by the pressurization of the topping-up pump that is arranged on Liquefied Ethylene Carriers, by the low temperature liquid ethene on Liquefied Ethylene Carriers by described low temperature liquid ethene unload a ship arm, described in pipeline of unloading a ship be transported in described low temperature liquid ethene storage tank;
Described low temperature ethylene pump is arranged in described low temperature liquid ethene storage tank, and described economizer is connected with described low temperature liquid ethene storage tank, and described low temperature ethylene pump is by the extremely described economizer of the low temperature ethylene positive delivery in described low temperature liquid ethene storage tank;
Between the top that described BOG compressor unit is connected to described low temperature liquid ethene storage tank and described economizer, described pressure loading valve is connected with described economizer, BOG in described low temperature liquid ethene storage tank is condensed into ethene after described BOG compressor unit is compressed in described economizer, the ethene that this strand is condensed into enters described pressure loading valve and is divided into gas, liquid two-phase through expenditure and pressure, wherein liquid phase is back to described low temperature liquid ethene storage tank via pipeline, and gas phase is back to described BOG compressor unit two grades of source lines via pipeline;
Described ethene topping-up pump is connected between described ethene vaporizer and described economizer, the liquid ethylene come by described low temperature liquid ethene storage tank is through described economizer, the pressure of downstream user needs it is pressurized to again through described ethene topping-up pump, then through the gasification of described ethene vaporizer, and used to downstream user by the Cemented filling being connected with described ethene vaporizer.
Further, described BOG compressor unit comprises multi-stage compressor, and when the temperature of pressurized gas exceedes set temperature value, between each stage compressor, also it is provided with interstage cooler, and the gaseous ethene that described pressure loading valve exports is sent to two grades of entrances of described BOG compressor unit.
The present invention, by adopting economizer, utilizes the cold of liquid ethylene by BOG condensation, so by expenditure and pressure be divided into gas, liquid two-phase and reclaim respectively, calculate after deliberation and show, can obviously reduce the gasify power consumption of output system and cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the energy-saving low-temperature liquid ethylene gasifying process system schematic that the gas-liquid of one embodiment of the invention shunts recovery mutually.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not paying other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the energy-saving low-temperature liquid ethylene gasifying process system schematic that the gas-liquid of one embodiment of the invention shunts recovery mutually. As shown in Figure 1, this energy-saving low-temperature liquid ethylene gasifying process system comprises: low temperature liquid ethene is unloaded a ship arm, pipeline of unloading a ship, low temperature liquid ethene storage tank, BOG compressor unit, economizer, pressure loading valve, ethene vaporizer, low temperature ethylene pump and ethene topping-up pump, wherein:
Described pipeline of unloading a ship is connected to described low temperature liquid ethene and unloads a ship between one end of arm and described low temperature ethylene storage tank, the unload a ship the other end of arm of described low temperature liquid ethene is connected with ethene transport-ship, by the pressurization of the topping-up pump that is arranged on Liquefied Ethylene Carriers, by the low temperature liquid ethene on Liquefied Ethylene Carriers by described low temperature liquid ethene unload a ship arm, described in pipeline of unloading a ship be transported in described low temperature liquid ethene storage tank;
Described low temperature ethylene pump is arranged in described low temperature liquid ethene storage tank, and described economizer is connected with described low temperature liquid ethene storage tank, and described low temperature ethylene pump is by the extremely described economizer of the low temperature ethylene positive delivery in described low temperature liquid ethene storage tank;
Between the top that described BOG compressor unit is connected to described low temperature liquid ethene storage tank and described economizer, described pressure loading valve is connected with described economizer, BOG in described low temperature liquid ethene storage tank is condensed into ethene after described BOG compressor unit is compressed in described economizer, the ethene that this strand is condensed into enters described pressure loading valve and is divided into gas, liquid two-phase through expenditure and pressure, wherein liquid phase is back to described low temperature liquid ethene storage tank via pipeline, and gas phase is back to described BOG compressor unit two grades of ingress via pipeline;
Described ethene topping-up pump is connected between described ethene vaporizer and described economizer, the liquid ethylene come by described low temperature liquid ethene storage tank is pressurized to the pressure of downstream user needs through described ethene topping-up pump, then through the gasification of described ethene vaporizer, and used to downstream user by the Cemented filling being connected with described ethene vaporizer.
Further, described BOG compressor unit comprises multi-stage compressor, and when the temperature of pressurized gas exceedes set temperature value, between each stage compressor, also it is provided with interstage cooler, and the gaseous ethene that described pressure loading valve exports is sent to two grades of entrances of described BOG compressor unit.
Defeated vapor pressure 50barg, the outer throughput rate 25t/h of ethene, output temperature 20 DEG C are example in addition, under this condition, BOG compressor delivery pressure and low temperature ethylene pump outlet pressure are all 7barg, and economizer also completes the heat exchange of BOG and low temperature liquid ethene at this pressure. Calculating according to research, BOG compressor unit power consumption is 189kW, the power consumption of two ethene pumps and be 92kW, total power consumption of whole system be both sum, i.e. 281kW. Under same initial conditions, directly the BOG compressor delivery pressure needs in the outer defeated method of compression are brought up to identical with outer defeated pressure, i.e. 50barg. According to calculation result, now BOG compressor unit power consumption is 446kW, the compressor power consumption being much higher than in economizer absorption method. The key parameter synopsis of two kinds of BOG treatment processs when table 1 is outer defeated pressure 50barg, as shown in Table 1, economizer absorption method defeated method outer than directly compression saves total power consumption of nearly 50%.
Table 1
In the above embodiment of the present invention, add an economizer and an ethene Send out pump. Assume newly added equipment cost by 2,000,000 yuan, factory working time in year by 8000 hours, the electricity charge by 0.6 yuan/degree, according to calculating, 1.7 years i.e. recoverable cost, this technique is completely feasible. And under the outer defeated pressure of height, directly the BOG compressor in the outer defeated method of compression also needs to increase the progression of compressor, causes BOG compressor apparatus cost value to increase.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, module or flow process in accompanying drawing might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in device in embodiment can describe according to embodiment and be distributed in the device of embodiment, it is also possible to carries out respective change and is arranged in the one or more devices being different from the present embodiment. The module of above-described embodiment can merge into a module, it is also possible to splits into multiple submodule block further.
Last it is noted that above embodiment is only in order to illustrate the technical scheme of the present invention, it is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, it will be understood by those within the art that: the technical scheme described in previous embodiment still can be modified by it, or wherein part technology feature is carried out equivalent replacement; And these amendments or replacement, do not make the spirit and scope of the essence disengaging embodiment of the present invention technical scheme of appropriate technical solution.
Claims (2)
1. a gas-liquid shunts the energy-saving low-temperature liquid ethylene gasifying process system of recovery mutually, it is characterized in that, comprise: low temperature liquid ethene is unloaded a ship arm, pipeline of unloading a ship, low temperature liquid ethene storage tank, BOG compressor unit, economizer, pressure loading valve, ethene vaporizer, low temperature ethylene pump and ethene topping-up pump, wherein:
Described pipeline of unloading a ship is connected to described low temperature liquid ethene and unloads a ship between one end of arm and described low temperature ethylene storage tank, the unload a ship the other end of arm of described low temperature liquid ethene is connected with ethene transport-ship, by the pressurization of the topping-up pump that is arranged on Liquefied Ethylene Carriers, by the low temperature liquid ethene on Liquefied Ethylene Carriers by described low temperature liquid ethene unload a ship arm, described in pipeline of unloading a ship be transported in described low temperature liquid ethene storage tank;
Described low temperature ethylene pump is arranged in described low temperature liquid ethene storage tank, and described economizer is connected with described low temperature liquid ethene storage tank, and described low temperature ethylene pump is by the extremely described economizer of the low temperature ethylene positive delivery in described low temperature liquid ethene storage tank;
Between the top that described BOG compressor unit is connected to described low temperature liquid ethene storage tank and described economizer, described pressure loading valve is connected with described economizer, BOG in described low temperature liquid ethene storage tank is condensed into ethene after described BOG compressor unit is compressed in described economizer, the ethene that this strand is condensed into enters described pressure loading valve and is divided into gas, liquid two-phase through expenditure and pressure, wherein liquid phase is back to described low temperature liquid ethene storage tank via pipeline, and gas phase is back to described BOG compressor unit two grades of source lines via pipeline;
Described ethene topping-up pump is connected between described ethene vaporizer and described economizer, the liquid ethylene come by described low temperature liquid ethene storage tank is through described economizer, the pressure of downstream user needs it is pressurized to again through described ethene topping-up pump, then through the gasification of described ethene vaporizer, and used to downstream user by the Cemented filling being connected with described ethene vaporizer.
2. energy-saving low-temperature liquid ethylene gasifying process system according to claim 1, it is characterized in that, described BOG compressor unit comprises multi-stage compressor, and when the temperature of pressurized gas exceedes set temperature value, interstage cooler also it is provided with, and the gaseous ethene that described pressure loading valve exports is sent to two grades of entrances of described BOG compressor unit between each stage compressor.
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| FR3049331B1 (en) * | 2016-03-22 | 2018-09-14 | Gaztransport Et Technigaz | FUEL GAS SUPPLY INSTALLATION OF A GAS CONSUMER ORGAN AND LIQUEFACTION OF SUCH FUEL GAS |
| CN105715949A (en) * | 2016-04-12 | 2016-06-29 | 浙江新锐空分设备有限公司 | Low-temperature ethylene prestressed concrete full-container storage gasifying external transportation system |
| CN108613477B (en) * | 2018-04-04 | 2023-10-31 | 中国寰球工程有限公司 | Ethane refrigerant storage system suitable for FLNG and operation method |
| CN109058758B (en) * | 2018-08-27 | 2023-08-04 | 中国寰球工程有限公司 | Ethylene comprehensive conveying system and method |
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Address after: Two road 100012 Beijing city Chaoyang District high tech Industrial Park, No. 1. Patentee after: China Global Engineering Co. Ltd. Address before: Two road 100012 Beijing city Chaoyang District high tech Industrial Park, No. 1. Patentee before: China Huanqiu Engineering Co. |
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Effective date of registration: 20201202 Address after: 100120 Beijing Xicheng District six laying Kang Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA HUANQIU CONTRACTING & ENGINEERING Co.,Ltd. Address before: Two road 100012 Beijing city Chaoyang District high tech Industrial Park, No. 1. Patentee before: CHINA HUANQIU CONTRACTING & ENGINEERING Co.,Ltd. |
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