CN103994326A - Energy-saving type low-temperature ethylene gasification process system adopting economizer and recondenser - Google Patents
Energy-saving type low-temperature ethylene gasification process system adopting economizer and recondenser Download PDFInfo
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Abstract
The invention discloses an energy-saving type low-temperature ethylene gasification process system adopting an economizer and a recondenser. In the system, a ship unloading pipeline is connected between one end of a low-temperature liquid ethylene ship unloading arm and a low-temperature ethylene storage tank, the other end of the low-temperature liquid ethylene ship unloading arm is connected with an ethylene transport ship, pressurization is carried out through a booster pump arranged on the ethylene ship, and low-temperature liquid ethylene in the ethylene ship is transported to the low-temperature liquid ethylene storage tank through the low-temperature liquid ethylene ship unloading arm and the ship unloading pipeline; a low-temperature ethylene pump is arranged in the low-temperature liquid ethylene storage tank, the economizer is connected with the low-temperature liquid ethylene storage tank, and the low-temperature ethylene pump pressurizes and transports the low-temperature ethylene in the low-temperature liquid ethylene storage tank to the economizer; a BOG compressor set is connected between the top of the low-temperature liquid ethylene storage tank and the economizer, and BOG in the low-temperature liquid ethylene storage tank is compressed by the BOG compressor set and then is condensed into ethylene in the economizer; the ethylene booster pump is connected between an ethylene evaporator and an outlet of the economizer.
Description
Technical field
The present invention relates to ethene accumulating field, in particular to a kind of energy-saving low-temperature ethylene gas metallization processes system that adopts economizer/after-condenser.
Background technique
Ethene is one of 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 has promoted the development of synthetic material industry greatly.At present, utilize the general plastics such as polyethylene that hydrocarbons produces, polypropylene, vinyl benzene 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 is being continued to increase, domestic ethylene yielding capacity can not satisfy the demands, thereby needs a large amount of imports.
The import of ethene adopts the mode of atmospheric low-temperature groove ship conventionally, and liquid ethylene shipping is come back home.The volume of-104 ℃ of liquid ethylenes of the inferior weight of normal pressure is about 1/490 of gaseous ethylene under normal pressure, it is much smaller that visible grade is depressed the volume of gaseous ethylene of volume ratio equivalent weight of liquid ethylene, thereby 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 obtaining the demand indication of downstream user, by be arranged on the outer and liquid ethylene transfer pump that is connected with storage tank of storage tank to the liquid ethylene pressurized delivered in storage tank to vaporizer, through the gasification of vaporizer, the gaseous ethylene that obtains high pressure flows to downstream user and uses.
The liquid ethylene temperature very low (approximately-104 ℃) of low temperature, there is the very large temperature difference (approximately 130 ℃) with ambient temperature, therefore unloading a ship, pump pressurization, pipeline is carried, storage tank is deposited etc. in manufacturing process, the heat of absorbing environmental can produce a large amount of boil-off gas (BOG, Boil Off Gas), the composition of BOG is still ethene, if do not recycled, directly discharge, cause on the one hand waste, also can bring in addition the problem of environmental pollution, especially current day by day serious haze weather, ethene discharge needs strict restriction, therefore how rationally to reclaim the key of BOGShi ethene receiving station process system design.
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, be called the outer defeated technique of direct compression, but because the pressure of BOG is very low, approach atmospheric pressure, therefore when outer defeated pressure is higher, the power consumption of compressor is very high, and the facility investments such as equipment and 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 higher, cost is higher.
Summary of the invention
The invention provides a kind of energy-saving low-temperature ethylene gas metallization processes system that adopts economizer/after-condenser, at least one problem existing in order to overcome prior art.
For achieving the above object, the invention provides a kind of energy-saving low-temperature ethylene gas metallization processes system that adopts economizer, comprise: low-temperature liquid ethylene unload a ship arm, the pipeline of unloading a ship, low-temperature liquid ethylene storage tank, BOG compressor bank, economizer, ethene vaporizer, low temperature ethylene pump and ethene suction booster, wherein:
The described pipeline of unloading a ship is connected to described low-temperature liquid ethylene and unloads a ship between one end and described low temperature ethylene storage tank of arm, the unload a ship the other end of arm of described low-temperature liquid ethylene is connected with ethene cargo ship, by the suction booster being arranged on Liquefied Ethylene Carriers, pressurize, by the low-temperature liquid ethylene on Liquefied Ethylene Carriers by described low-temperature liquid ethylene unload a ship arm, described in the pipeline of unloading a ship be transported in described low-temperature liquid ethylene storage tank;
Described low temperature ethylene pump is arranged in described low-temperature liquid ethylene storage tank, and described economizer is connected with described low-temperature liquid ethylene storage tank, described low temperature ethylene pump by the low temperature ethylene pressurized delivered in described low-temperature liquid ethylene storage tank to described economizer;
Described BOG compressor bank is connected between the top and described economizer of described low-temperature liquid ethylene storage tank, BOG in described low-temperature liquid ethylene storage tank is condensed into ethene after described BOG compressor bank compression in described economizer, and the ethene that this strand is condensed into converges with the liquid ethylene from described low-temperature liquid ethylene storage tank in the outlet of described economizer;
Described ethene suction booster is connected between described ethene vaporizer and the outlet of described economizer, liquid ethylene after converging is pressurized to the pressure of downstream user needs through described ethene suction booster, then through the gasification of described ethene vaporizer, and by the pipeline being connected with described ethene vaporizer, be delivered to downstream user and use.
Further, described BOG compressor bank can comprise multistage compressor, and when the temperature of pressurized gas surpasses set temperature value, is also provided with interstage cooler between each stage compressor.
For achieving the above object, the present invention also provides a kind of energy-saving low-temperature ethylene gas metallization processes system that adopts after-condenser, comprise: low-temperature liquid ethylene unload a ship arm, the pipeline of unloading a ship, low-temperature liquid ethylene storage tank, BOG compressor bank, after-condenser, ethene vaporizer, low temperature ethylene pump and ethene suction booster, wherein:
The described pipeline of unloading a ship is connected to described low-temperature liquid ethylene and unloads a ship between one end and described low temperature ethylene storage tank of arm, the unload a ship the other end of arm of described low-temperature liquid ethylene is connected with ethene cargo ship, by the suction booster being arranged on Liquefied Ethylene Carriers, pressurize, by the low-temperature liquid ethylene on Liquefied Ethylene Carriers by described low-temperature liquid ethylene unload a ship arm, described in the pipeline of unloading a ship be transported in described low-temperature liquid ethylene storage tank;
Described low temperature ethylene pump is arranged in described low-temperature liquid ethylene storage tank, and described after-condenser is connected with described low-temperature liquid ethylene storage tank, described low temperature ethylene pump by the low temperature ethylene pressurized delivered in described low-temperature liquid ethylene storage tank to described after-condenser;
Described BOG compressor bank is connected between the top and described after-condenser of described low-temperature liquid ethylene storage tank, and the BOG in described low-temperature liquid ethylene storage tank mixes with liquid ethylene from described low-temperature liquid ethylene storage tank and is condensed into liquid ethylene after the compression of described BOG compressor bank in described after-condenser;
Described ethene suction booster is connected between described ethene vaporizer and the outlet of described after-condenser, liquid ethylene after converging is pressurized to the pressure of downstream user needs through described ethene suction booster, then through the gasification of described ethene vaporizer, and by the pipeline being connected with described ethene vaporizer, be delivered to downstream user and use.
Further, described BOG compressor bank can comprise multistage compressor, and when the temperature of pressurized gas surpasses set temperature value, is also provided with interstage cooler between each stage compressor.
The present invention is by adopting economizer or after-condenser, utilize the cold of the liquid ethylene in storage tank that BOG has been condensed into liquid phase, and defeated outside supercharging gasification together with after mixing with liquid ethylene, calculate and show after deliberation, can obviously reduce power consumption and the cost of gasification output system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the energy-saving low-temperature ethylene gas metallization processes system schematic of the employing economizer of one embodiment of the invention;
Fig. 2 is the energy-saving low-temperature ethylene gas metallization processes system schematic of the employing after-condenser of another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Embodiment based in the present invention, those of ordinary skills, not paying the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
Following examples have two kinds of technological process forms, all can reach identical technique effect.The nucleus equipment of these two kinds of technological processes is respectively economizer and after-condenser, therefore can be referred to as the outer defeated method of economizer and the outer defeated method of after-condenser.
Fig. 1 embodiment is the outer defeated method of economizer, as shown in Figure 1, this energy-saving low-temperature liquid ethylene gasifying process system comprises: low-temperature liquid ethylene unload a ship arm, the pipeline of unloading a ship, low-temperature liquid ethylene storage tank, BOG compressor bank, economizer, ethene vaporizer, low temperature ethylene pump and ethene suction booster, wherein:
The pipeline of unloading a ship is connected to low-temperature liquid ethylene and unloads a ship between one end and low temperature ethylene storage tank of arm, the unload a ship the other end of arm of low-temperature liquid ethylene is connected with ethene cargo ship, by the suction booster being arranged on Liquefied Ethylene Carriers, pressurize, the low-temperature liquid ethylene on Liquefied Ethylene Carriers is transported in low-temperature liquid ethylene storage tank by unload a ship arm, the pipeline of unloading a ship of low-temperature liquid ethylene;
Low temperature ethylene pump is arranged in low-temperature liquid ethylene storage tank, and economizer is connected with low-temperature liquid ethylene storage tank, low temperature ethylene pump by the low-temperature liquid ethylene pressurized delivered in low-temperature liquid ethylene storage tank to economizer;
BOG compressor bank is connected between the top and economizer of low-temperature liquid ethylene storage tank, BOG in low-temperature liquid ethylene storage tank is condensed into ethene after the compression of BOG compressor bank in economizer, and the ethene that this strand is condensed into converges with the liquid ethylene from low-temperature liquid ethylene storage tank in the outlet of economizer;
Ethene suction booster is connected between ethene vaporizer and the outlet of economizer, liquid ethylene after converging is pressurized to the pressure of downstream user needs through ethene suction booster, then through ethene vaporizer gasification, and by the pipeline being connected with ethene vaporizer, be delivered to downstream user and use.
Further, BOG compressor bank can comprise multistage compressor, and when the temperature of pressurized gas surpasses set temperature value, is also provided with interstage cooler between each stage compressor.As in one embodiment of the invention, BOG compressor bank comprises first order compressor, compressor inter-stage cooler and second and third stage compressor being connected successively.
Outside economizer in defeated method, the low-temperature liquid ethylene arm of unloading a ship ships and connects with Liquefied Ethylene Carriers, by the pump on ship, pressurize, by the low-temperature liquid ethylene on ship by the arm of unloading a ship, the pipeline of unloading a ship is transported in low-temperature liquid ethylene storage tank, low temperature ethylene pump is arranged in storage tank, pump by the low temperature ethylene pressurized delivered in storage tank to economizer, in economizer, carry out heat exchange with the BOG after BOG compressor compresses, and BOG is condensed into liquid ethylene, this strand of liquid ethylene is sent to economizer outlet, after converging with liquid ethylene from storage tank, enter together ethene suction booster and be pressurized to the pressure that downstream user needs, then enter the gasification of ethene vaporizer outer defeated, by pipeline, send downstream user to use.
Fig. 2 embodiment is the outer defeated method of economizer, as shown in Figure 2, this energy-saving low-temperature liquid ethylene gasifying process system comprises: low-temperature liquid ethylene unload a ship arm, the pipeline of unloading a ship, low-temperature liquid ethylene storage tank, BOG compressor bank, after-condenser, ethene vaporizer, low temperature ethylene pump and ethene suction booster, wherein:
The pipeline of unloading a ship is connected to low-temperature liquid ethylene and unloads a ship between one end and low temperature ethylene storage tank of arm, the unload a ship the other end of arm of low-temperature liquid ethylene is connected with ethene cargo ship, by the suction booster being arranged on Liquefied Ethylene Carriers, pressurize, the low-temperature liquid ethylene on Liquefied Ethylene Carriers is transported in low-temperature liquid ethylene storage tank by unload a ship arm, the pipeline of unloading a ship of low-temperature liquid ethylene;
Low temperature ethylene pump is arranged in low-temperature liquid ethylene storage tank, and after-condenser is connected with low-temperature liquid ethylene storage tank, low temperature ethylene pump by the low temperature ethylene pressurized delivered in low-temperature liquid ethylene storage tank to after-condenser;
BOG compressor bank is connected between the top and after-condenser of low-temperature liquid ethylene storage tank, and the BOG in low-temperature liquid ethylene storage tank mixes with liquid ethylene from low-temperature liquid ethylene storage tank and is condensed into liquid ethylene after BOG compressor bank compression in after-condenser;
Ethene suction booster is connected between ethene vaporizer and the outlet of after-condenser, liquid ethylene after converging is pressurized to the pressure of downstream user needs through ethene suction booster, then through ethene vaporizer gasification, and by the pipeline being connected with ethene vaporizer, be delivered to downstream user and use.
Further, BOG compressor bank can comprise multistage compressor, and when the temperature of pressurized gas surpasses set temperature value, is also provided with interstage cooler between each stage compressor.As in one embodiment of the invention, BOG compressor bank comprises first order compressor, compressor inter-stage cooler and second and third stage compressor being connected successively.
Outside after-condenser in defeated method, after-condenser has replaced economizer, BOG can follow the liquid ethylene direct contact heat transfer in after-condenser from storage tank, after mixing, form one new liquid ethylene again by suction booster and ethene vaporizer meet the requirements of carry out after pressure, temperature outer defeated.The technological process of two kinds of methods is slightly different, but according to result of study, its system power dissipation is identical.
With 20 ℃ of ethylene gas outer defeated pressure 50barg, ethene output quantity 25t/h, output temperatures, adopting the outer defeated method of economizer is example.With this understanding, BOG compressor delivery pressure and low temperature ethylene delivery side of pump pressure are all 7barg, and economizer also completes the heat exchange of BOG and low-temperature liquid ethylene under this pressure.According to research, calculate, BOG compressor bank power consumption is 187kW, the power consumption of two ethene pumps and be 91kW, and the total power consumption of whole system is both sums, i.e. 278kW.Under same initial conditions, the BOG compressor delivery pressure outside directly compressing in defeated method need to be brought up to identical with outer defeated pressure, i.e. 50barg.According to result of calculation, now BOG compressor bank power consumption is 446kW, has been much higher than the compressor power consumption in the outer defeated method of economizer.The key parameter table of comparisons of three kinds of BOG processing methods when table 1 is outer defeated pressure 50barg, as shown in Table 1, the outer defeated method of economizer has been saved nearly 50% total power consumption than defeated method outside directly compressing.
Table 1
Outside economizer, in defeated method, an economizer and an ethene rear pump have been increased.Suppose 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 is recoverable cost, therefore the outer defeated feasible process of economizer.And under defeated pressure, directly the BOG compressor in the outer defeated method of compression also needs to increase the progression of compressor, causes BOG compressor apparatus cost price to increase outside height.
Consistent in the outer defeated method principle of the outer defeated law and economy device of after-condenser, be all to have utilized the cold of the liquid ethylene in storage tank that BOG has been condensed into liquid phase, and defeated outside supercharging gasification together with after mixing with liquid ethylene.This flow process power consumption is found in table 1, and its numerical value is identical with the outer defeated method of economizer.Therefore two methods can be equal to a kind of technology, but can select different technological processes according to different demands in practical engineering project.
One of ordinary skill in the art will appreciate that: accompanying drawing is an embodiment's schematic diagram, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device in embodiment can be described and be distributed in embodiment's device according to embodiment, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
Finally it should be noted that: above embodiment only, in order to technological scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technological scheme that still can record previous embodiment is modified, or part technical characteristics is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technological scheme.
Claims (4)
1. an energy-saving low-temperature ethylene gas metallization processes system that adopts economizer, it is characterized in that, comprise: low-temperature liquid ethylene unload a ship arm, the pipeline of unloading a ship, low-temperature liquid ethylene storage tank, BOG compressor bank, economizer, ethene vaporizer, low temperature ethylene pump and ethene suction booster, wherein:
The described pipeline of unloading a ship is connected to described low-temperature liquid ethylene and unloads a ship between one end and described low temperature ethylene storage tank of arm, the unload a ship the other end of arm of described low-temperature liquid ethylene is connected with ethene cargo ship, by the suction booster being arranged on Liquefied Ethylene Carriers, pressurize, by the low-temperature liquid ethylene on Liquefied Ethylene Carriers by described low-temperature liquid ethylene unload a ship arm, described in the pipeline of unloading a ship be transported in described low-temperature liquid ethylene storage tank;
Described low temperature ethylene pump is arranged in described low-temperature liquid ethylene storage tank, and described economizer is connected with described low-temperature liquid ethylene storage tank, described low temperature ethylene pump by the low temperature ethylene pressurized delivered in described low-temperature liquid ethylene storage tank to described economizer;
Described BOG compressor bank is connected between the top and described economizer of described low-temperature liquid ethylene storage tank, BOG in described low-temperature liquid ethylene storage tank is condensed into ethene after described BOG compressor bank compression in described economizer, and the ethene that this strand is condensed into converges with the liquid ethylene from described low-temperature liquid ethylene storage tank in the outlet of described economizer;
Described ethene suction booster is connected between described ethene vaporizer and the outlet of described economizer, liquid ethylene after converging is pressurized to the pressure of downstream user needs through described ethene suction booster, then through the gasification of described ethene vaporizer, and by the pipeline being connected with described ethene vaporizer, be delivered to downstream user and use.
2. energy-saving low-temperature ethylene gas metallization processes system according to claim 1, it is characterized in that, described BOG compressor bank comprises multistage compressor, and when the temperature of pressurized gas surpasses set temperature value, is also provided with interstage cooler between each stage compressor.
3. an energy-saving low-temperature ethylene gas metallization processes system that adopts after-condenser, it is characterized in that, comprise: low-temperature liquid ethylene unload a ship arm, the pipeline of unloading a ship, low-temperature liquid ethylene storage tank, BOG compressor bank, after-condenser, ethene vaporizer, low temperature ethylene pump and ethene suction booster, wherein:
The described pipeline of unloading a ship is connected to described low-temperature liquid ethylene and unloads a ship between one end and described low temperature ethylene storage tank of arm, the unload a ship the other end of arm of described low-temperature liquid ethylene is connected with ethene cargo ship, by the suction booster being arranged on Liquefied Ethylene Carriers, pressurize, by the low-temperature liquid ethylene on Liquefied Ethylene Carriers by described low-temperature liquid ethylene unload a ship arm, described in the pipeline of unloading a ship be transported in described low-temperature liquid ethylene storage tank;
Described low temperature ethylene pump is arranged in described low-temperature liquid ethylene storage tank, and described after-condenser is connected with described low-temperature liquid ethylene storage tank, described low temperature ethylene pump by the low temperature ethylene pressurized delivered in described low-temperature liquid ethylene storage tank to described after-condenser;
Described BOG compressor bank is connected between the top and described after-condenser of described low-temperature liquid ethylene storage tank, and the BOG in described low-temperature liquid ethylene storage tank mixes with liquid ethylene from described low-temperature liquid ethylene storage tank and is condensed into liquid ethylene after the compression of described BOG compressor bank in described after-condenser;
Described ethene suction booster is connected between described ethene vaporizer and the outlet of described after-condenser, liquid ethylene after converging is pressurized to the pressure of downstream user needs through described ethene suction booster, then through the gasification of described ethene vaporizer, and by the pipeline being connected with described ethene vaporizer, be delivered to downstream user and use.
4. energy-saving low-temperature ethylene gas metallization processes system according to claim 3, it is characterized in that, described BOG compressor bank comprises multistage compressor, and when the temperature of pressurized gas surpasses set temperature value, is also provided with interstage cooler between each stage compressor.
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