CN208751137U - A kind of space division system using cold energy of liquefied natural gas - Google Patents
A kind of space division system using cold energy of liquefied natural gas Download PDFInfo
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- CN208751137U CN208751137U CN201821373558.4U CN201821373558U CN208751137U CN 208751137 U CN208751137 U CN 208751137U CN 201821373558 U CN201821373558 U CN 201821373558U CN 208751137 U CN208751137 U CN 208751137U
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Abstract
The utility model discloses a kind of space division systems and air separating method using cold energy of liquefied natural gas.It includes air gas separation unit, LNG cold energy use unit and ethylene glycol solution circulating cooling unit；The production energy consumption of LNG cold energy space division system is greatly reduced in the new technological process organizational form that low-temperature circulating nitrogen compressor is replaced by using circulating liquid nitrogen pump, and oxygen, Argon recovery rate are high, and for product nitrogen gas liquefied fraction up to 100%, surcharge is high；Cold mode can be also mended by liquid nitrogen reflux and matches the variation of LNG cooling capacity, and few to LNG receiving station technical requirements, versatility is stronger；The utility model, which is realized, reduces by 40% or more than existing LNG cold energy spatial division technology comprehensive energy consumption, and specific energy consumption reduces by 60% or more beneficial effect, and extreme underproduction operating condition specific energy consumption is still below the prior art, and cost advantage is fairly obvious.
Description
Technical field
The utility model relates to a kind of air-separating plant, in particular to a kind of air using cold energy of liquefied natural gas point
From device.
Background technique
Natural gas is as one of chemical energy source, because of its huge reserves and low pollution, be incrementally raised for and coal, stone
Main energy sources pillar after oil, has broad application prospects.The trade form of natural gas mainly has pipeline and LNG
(liquefied natural gas) transport, LNG need to gasify from liquefaction to room temperature, gasify before entering natural gas user pipe network
Journey will discharge huge cooling capacity.Air-separating plant can be significantly reduced power consumption, increase by making full use of the gasification cold energy of LNG
The output of liquid feeding body, improves competitiveness of the product in market sale, and economic benefit is fairly obvious.But since space division system is
Oxygen concentration area, natural gas are extremely sensitive harmful substances as hydrocarbon.Therefore, usually to the utilization of LNG cold energy
Cold energy is transmitted using intermediate medium, LNG is avoided to contact with the direct of space division system.Domestic and international LNG cold energy air separation unit is made a general survey of, it is general
Store-through is excessively complicated in its process organization, and energy consumption is higher, implements to be not easy, and operation control is inconvenient or security reliability is not good enough existing
As.For example multiple compressors, more expanding machines, knockout drums etc. are used, heat exchanger channel is more, and especially LNG is high pressure, heat exchange
Device channel is more, and cost is caused to sharply increase.Furthermore process organization is complicated, and the more region of the electrical components such as valve, measurement point needs
It is explosion-proof, hidden danger is brought for the safety of device.
Chinese patent application specification CN 101571340A discloses a kind of space division system using cold energy of liquefied natural gas
System, the patent use the circulation nitrogen compressor of three sections of low temperature air inlets, and using glycol-cooled system, but the acquisition of liquid oxygen product is main
It is to throttle to exchange heat with it to low pressure with the high pressure overfreezing liquid nitrogen in LNG- nitrogen heat exchanger by low oxygen, and recycle high-pressure liquid nitrogen
One of the cold source of supercooling be the low pressure liquid nitrogen of throttling, i.e., one section of inlet flow rate is larger in circulation low temperature nitrogen compressor, causes
Low temperature nitrogen compressor shaft power is higher.
Chinese patent application specification CN 101532768A discloses a kind of space division for efficiently utilizing cold energy of liquefied natural gas
System, the patent a part of the embodiment use liquid expander and replace throttle valve, expand high-pressure liquid nitrogen, but cooling capacity transfer medium
Circulating nitrogen gas drives by low-temperature circulating nitrogen compressor, circulating nitrogen gas is compressed to supercritical pressure, energy consumption ratio is pumped using liquid
Contracting liquid nitrogen is higher by decades of times.And there are a large amount of high pure nitrogens to diffuse because that can not liquefy, cause the synthesis specific energy consumption of system into one
Step increases.
For this reason, it may be necessary to develop the space division system using cold energy of liquefied natural gas for providing and can eliminating drawbacks described above.
Summary of the invention
The purpose of the utility model is to overcome the deficiencies in the prior art, provide it is a kind of versatile, it is natural using liquefaction
The space division system of air cooling energy, the system are organically combined the cryogenic cold energy for being pressurized to authorized pressure LNG with air gas separation unit
Get up, takes full advantage of the cold energy of LNG.
To achieve the above object the technical scheme adopted by the utility model is
A kind of space division system using cold energy of liquefied natural gas, it is characterised in that: including air gas separation unit, LNG cold energy
Utilize unit and ethylene glycol solution circulating cooling unit；
The ethylene glycol solution circulating cooling unit includes LNG- ethylene glycol heat exchanger 12 and ethylene glycol solution circulating pump 15；
The LNG cold energy use unit includes circulating liquid nitrogen pump 9, LNG- nitrogen heat exchanger 11, gas-liquid separator 10, liquid increasing
Compression swelling machine 13 and the second vent muffler 17；
The air gas separation unit includes self-cleaning air filter 1, air compressor 2, molecular sieve 3, regeneration gas heating
Device 14, main heat exchanger 4, liquefaction heat exchanger 5, rectifying column and the first vent muffler 16, rectifying column include lower tower 6, main condenser steaming
Send out device 7 and 8 three parts of upper tower.
In above-mentioned air gas separation unit, the outlet of self-cleaning air filter 1 and 2 entrance phase of air compressor
Even；3 entrance of molecular sieve is exported with air compressor 2 and the first vent muffler 16 is respectively connected with；Molecular sieve 3 outlet respectively with master
Heat exchanger 4 is connected with regeneration hot-air heater 14；
4 hot end of main heat exchanger and cold end have three strands, hot end respectively with the outlet of molecular sieve 3, LNG- nitrogen heat exchanger
11 hot ends are connected with regeneration hot-air heater 14；Cold end respectively with a hot end of liquefaction heat exchanger 5 and cold end, a circulating liquid nitrogen
The outlet of pump 9 is connected；
5 hot end of liquefaction heat exchanger and cold end have six strands；Cold end respectively with 4 one cold ends of main heat exchanger, upper tower 8
Top is connected with top, 6 top of lower tower, 10 top of gas-liquid separator with top；Hot end respectively with lower 6 bottom and top of tower, master
One cold end of heat exchanger 4, a hot end of LNG- nitrogen heat exchanger 11 are connected with the pressurization end entrance of liquid booster expansion machine 13；
The top of the lower tower 6 be equipped with two groups of outlets and entrance, wherein one group respectively with the hot end of main condenser evaporator 7 and
Cold end is connected, and another group is connected with the hot end of liquefaction heat exchanger 5 and cold end respectively；Bottom inlet and 5 hot end phase of liquefaction heat exchanger
Even, outlet at bottom is connected through throttle valve with upper 8 top of tower；
Be connected at the top of 7 entrance of main condenser evaporator and lower tower 6, outlet is divided into three strands, respectively with 6 top of lower tower,
Product liquid oxygen storage tank and through being connected at the top of throttle valve and upper tower 8；
The outlet of upper tower 8 is divided into three strands, is that top first outlet is connected with nitrogen products storage tank respectively, top second
Outlet and upper outlet are connected with two bursts of cold ends of liquefaction heat exchanger 5 respectively；Top and top two entrances respectively with main condenser
Evaporator 7 is connected with lower 6 bottom of tower.
For continuous uninterrupted use, it is two that the molecular sieve 3, which is divided to, is used alternatingly, one regeneration of a purifying.Purifying
The entrance at end is connected with the outlet of air compressor 2, and the outlet for purifying end is connected with 4 hot end of main heat exchanger；The entrance caused trouble again with
It regenerates the outlet of hot-air heater 14 to be connected, then the outlet caused trouble is connected with the first vent muffler 16.
In the ethylene glycol solution circulating cooling unit, 12 hot end of LNG- ethylene glycol heat exchanger and cold end have two
Stock, two stocks of cold end are not connected with cryogenic natural gas pipeline and 2 interstage cooler of air compressor and aftercooler entrance,
Hot end is connected with natural gas line and the outlet of ethylene glycol solution circulating pump 15 respectively；
15 entrance of ethylene glycol solution circulating pump and 2 interstage cooler of air compressor and aftercooler export phase
Even, outlet is connected with 12 hot end of LNG- ethylene glycol heat exchanger；By the two of reduction air compressor 2, three-level inlet temperature and divide
Son sieve intake air temperature, achievees the effect that reduce air compressor machine energy consumption and molecular sieve absorption resistance.
In the LNG cold energy use unit, the circulating liquid nitrogen pumps 9 entrances and is connected with 10 bottom of gas-liquid separator, exports
It is connected with 4 cold end of main heat exchanger；The mode that compressed gas is replaced by using compressed liquid uses liquid nitrogen pump generation that is, in equipment
For low temperature nitrogen compressor, achieve the effect that energy consumption is greatly reduced.
10 top exit of gas-liquid separator is connected with 5 two bursts of cold ends of liquefaction heat exchanger respectively with upper entrance, top
Another entrance is connected with liquid nitrogen product storage tank, and outlet at bottom pumps 9 entrances, nitrogen products storage tank and LNG- with circulating liquid nitrogen respectively
Nitrogen heat exchanger 11 is connected；Centre entrance is connected with the outlet of 13 expanding end of liquid booster expansion machine；
In order to improve Nitrogen Headspace rate, the release waste of space division nitrogen product is reduced, the liquid booster expansion machine of liquid nitrogen is used
Instead of liquid nitrogen throttle valve, the ability for making system have liquefaction all over products nitrogen.The liquid booster expansion machine 13 divides for pressurization
End and expanding end, the pressurization end entrance are connected with 5 two hot ends of liquefaction heat exchanger, outlet and 11 hot end phase of LNG- nitrogen heat exchanger
Even；The expansion end entrance is connected with 11 cold end of LNG- nitrogen heat exchanger, and outlet is connected with gas-liquid separator 10；
11 cold end of LNG- nitrogen heat exchanger have five strands, hot end have four strands, cold end respectively with LNG pipeline, liquefaction heat exchanger 5
Hot end, liquid booster expansion machine 13 expand end entrance, LNG- ethylene glycol heat exchanger (12) is connected with 10 bottom of gas-liquid separator；Heat
End respectively with natural gas line, the outlet of 13 pressurized end of liquid booster expansion machine, 4 hot end of main heat exchanger and the second vent muffler 17
It is connected.
It is described in order to improve the adaptability for utilizing cold energy of liquefied natural gas space division system to change cold source LNG cooling capacity
One heat exchanger channels is arranged in LNG- nitrogen heat exchanger 11, and both ends are connected with gas-liquid separator 10 and the second vent muffler 17 respectively,
It is used to be opened in LNG cold energy deficiency；Heat exchange gas channel middle extract out one 604, with adjust input LNG- ethylene glycol
The cooling capacity of heat exchanger 12.
In order to facilitate starting whole system, one pipeline being connected with nitrogen products tank is arranged in the gas-liquid separator 10
216, it is used in space division system starting.
Multiple logistics phase transformations influence heat exchange efficiency, the main heat exchanger 4, liquefaction heat exchanger 5, the heat exchange of LNG- nitrogen in order to prevent
What device 11 was formed by individual one or by multiple points of heat exchangers, it avoids that Temperature cross-over occurs in heat exchanger.
The method for carrying out air separation using the space division system of above-mentioned cold energy of liquefied natural gas, comprising the following steps:
A) raw air compresses after self-cleaning strainer 1 removes most of solid impurity into air compressor 2, leads to
Over-molecular sieve system 3 obtains pure air 103 after removing the impurity such as water removal, hydrocarbon；
B) pure air 103 is in main heat exchanger 4 by extracting out and providing in liquefaction heat exchanger 5 cold with upper 8 top of tower
It measures and the dirty nitrogen 402 of preliminary re-heat and cycle of higher pressure liquid nitrogen 501 exchanges heat and be cooled and liquefy；It is completely multiple in main heat exchanger
The dirty nitrogen 403 of heat connects purification system 3 and does regeneration gas and cold blowing gas；
C) air 104 after liquefying provides cooling capacity in liquefaction heat exchanger 5 for liquefaction pressure nitrogen 205 and 208, and multiple
Heat enters in rectifying tower system for gas-liquid mixed air 105 is separated into discharge logistics, and the discharge logistics includes from upper 7 top of tower
The dirty nitrogen 401 that obtained pure nitrogen gas 202 and liquid nitrogen product 218,7 top Cong Shangta obtain, the liquid oxygen obtained from upper tower bottom
301；
D) raw air 105 obtains oxygen-enriched liquid air 106 in lower 6 bottom of tower, in lower tower 6 in lower tower 6 after initial gross separation
Top obtains medium pressure nitrogen gas, and medium pressure nitrogen gas enters main condenser evaporator 7, is condensed into liquid nitrogen by the liquid oxygen of upper 8 bottom of tower, the liquid nitrogen
A part send lower tower 6 back to maintain the rectifying operating condition of lower tower 6, the throttling of another part liquid nitrogen 201 is sent at the top of upper tower 8 and participates in essence
It evaporates；In addition it extracts one pressure nitrogen gas 208 out and enters liquefaction heat exchanger 5, lower tower 6 is returned after being liquefied and does phegma；Oxygen-enriched liquid air
It is sent into after 106 throttlings in the middle part of upper tower 8 and participates in the rectifying of upper tower 8；
E) liquid nitrogen 201, oxygen-enriched liquid air 106 and the gas oxygen progress of the evaporation of main condenser evaporator 7 for being sent into upper tower are smart again
It evaporates, low-pressure nitrogen 202 and liquid nitrogen 218 is obtained at the top of Cong Shangta 8,8 top Cong Shangta obtains dirty nitrogen 401, main condenser evaporator 7
Top be connected to upper 8 bottom of tower, obtain liquid oxygen in upper 8 bottom of tower, extract unvaporized liquid oxygen out from main condenser evaporator 7
301, it sends out and is used as product liquid oxygen；The re-heat in liquefaction heat exchanger 5 and main heat exchanger 4 of dirty nitrogen 401 obtained from upper 8 top of tower
It heats up out and is divided into two-way after air gas separation unit, dirty nitrogen is regenerated hot-air heater 16 type air purifier 3 is gone to be used as to regenerate all the way
Gas goes vent muffler to be vented as the dirty nitrogen of emptying all the way；If space division has ar system, Argon fraction is obtained in the middle part of upper tower,
Argon fraction is sent into argon producing system and produces product liquid argon, which no longer tired out herein known to industry technical staff
It states；
F) a part of liquid nitrogen 213 obtained in gas-liquid separator 10 is pressurised into supercritical pressure into circulating liquid nitrogen pump 9
Liquid nitrogen 501 simultaneously enters after 4 re-heat of main heat exchanger is room temperature, is cooled into LNG- nitrogen heat exchanger 11 by high pressure LNG602 overcritical
Liquid nitrogen 503 obtains LNG cold energy；Enter 13 expanding end of liquid booster expansion machine after liquefaction and is expanded to low-pressure gas-liquid mixing nitrogen
210, nitrogen 211 and liquid nitrogen are separated into gas-liquid separator 10.The pure nitrogen gas 202 and nitrogen 211 extracted out at the top of upper tower 8 enter
Liquefaction heat exchanger 5 provides cooling capacity, and nitrogen 203 is mixed into after re-heat and enters 13 pressurized end boil down to low pressure of liquid booster expansion machine
Nitrogen 204, into LNG- nitrogen heat exchanger 11 it is cooled after to enter back into liquefaction heat exchanger 5 further cooling and liquefy as liquid nitrogen 206,
Enter gas-liquid separator 10 after throttling, is mixed into liquid nitrogen 212 with the liquid nitrogen separated after expansion；
G) tri- tunnel 212 Fen Wei of liquid nitrogen in gas-liquid separator 10, circulating liquid nitrogen 213, nitrogen products 217 and the cold liquid nitrogen of benefit
214；213 flow of circulating liquid nitrogen immobilizes, and when LNG601 meets requirement of system design, mending cold 214 flow of liquid nitrogen is 0, when
When LNG601 flow is higher than design temperature or two kinds of situations while occurring lower than design discharge or temperature, reduced by actual conditions
217 flow of nitrogen products increases and mends cold 214 flow of liquid nitrogen, to maintain system stable operation；Under extreme case, storage also can be used
Liquid nitrogen in tank is mended cold；
H) LNG601 gasifies after exchanging heat to go out the natural gas 604 and 605 of LNG- nitrogen heat exchanger 11, middle pumping natural gas 604
Temperature is still below 0 degree, exchanges heat in ethylene glycol heat exchanger 12 after mixing LNG603 with glycol water 701, obtains LNG603
It is situated between with the glycol water 703 of 604 cold energy of natural gas as 2 interstage cooler of air compressor and the cooling of aftercooler
Matter, the glycol water 702 after heat exchange pressurize through ethylene glycol solution circulating pump 15, return ethylene glycol heat exchanger 12 and carry out circulating picture-changing
Heat, LNG603 and natural gas 604 are warming up to normal-temperature natural-gas 606 and mix feeding gas distributing system 607 with natural gas 605.
Natural gas leakage enters air gas separation unit threat production safety, above-mentioned supercritical steam cycle nitrogen 502 in order to prevent
Pressure is higher than LNG601, and it is smaller to the leakage of nitrogen 502 possibility that LNG601 occurs；Report is provided on 205 pipeline of nitrogen
Alert chain hydrocarbon detector.In case of pollution, can emergency cut-off liquid nitrogen 217, prevent liquid nitrogen in pollution storage tank.
The utility model has the beneficial effects that
In the utility model, it is pumped contracting liquid nitrogen using circulating liquid nitrogen, as driving air gas separation unit and LNG cold energy
Utilize the method for cooling capacity transfer medium between unit, compared with low-temperature circulating nitrogen compressor in the prior art, the energy of liquid nitrogen pump
Consumption and equipment investment can reduce by 90% or more；In addition, low-temperature circulating nitrogen compressor damage more irreversible than the acting that circulating liquid nitrogen pumps
Mistake is more, can also substantially raise the dosage of LNG；Meanwhile low-temperature circulating nitrogen compressor belongs to Special Compressor, operation difficulty and guarantor
It supports costly；The utility model replaces the new technological process tissue shape of low-temperature circulating nitrogen compressor by using circulating liquid nitrogen pump
Formula solves equipment energy consumption height, big, complicated for operation, maintenance valuableness of investment for driving circulating nitrogen gas etc. one in the prior art
Series of problems, it is practical.
In the utility model, expanded using liquid expander by LNG supercritical pressure liquid nitrogen after cooling, while to pressurization
Not liquefied nitrogen provides condition for further cooling throttling liquefaction in the output work compressibility of end, and liquid booster expansion machine exists
While making full use of high-pressure liquid nitrogen pressure energy, the liquefied fraction of product nitrogen gas greatly improved；Compared with liquid throttle valve, although
Liquid booster expansion machine has the disadvantages such as equipment investment is high, takes up a large area, but is intended to reach identical liquid production under the same conditions
Amount is also needed to increase a low temperature nitrogen compressor using liquid throttle valve, also will increase system energy consumption while increasing investment
About 14%；The utility model replaces liquid throttle valve by using liquid booster expansion machine, solves superelevation hydraulic fluid in the prior art
The problem of nitrogen bulbs of pressure can waste, further reduced production energy consumption.
In the utility model, it is provided with one heat exchanger channels, so that nitrogen products is flowed through the release of LNG- nitrogen heat exchanger cold
The resistance that system fluctuates LNG cooling capacity greatly improved to substitute part LNG cold source in amount.The general wave of displacement outside LNG receiving station
Move larger, and flowed fluctuation also will affect LNG temperature, and LNG stream amount and temperature change can seriously affect cold energy space division just
Normal operation；The utility model production cost is low, when LNG cold source is undesirable, can use with nitrogen products instead of LNG's
Method, it is ensured that space division system stable operation；The liquid nitrogen product that the utility model LNG cold energy use unit extracts all flows through LNG-
Under the operating condition of nitrogen heat exchanger gasification, the average production cost of liquid product is still lower than the production cost of the prior art, has very strong
Competitiveness.The utility model solves in the prior art by using the mode of nitrogen products reflux LNG cold energy use unit
The cold energy space division problem high to LNG cold energy quality dependency degree defeated outside LNG receiving station, it is more adaptable, it produces more stable.
The utility model above-mentioned technical proposal for details see attached table with domestic LNG cold energy space division main performance can from subordinate list
This reality utility model performance is better than advanced international level out, and energy-saving effect is very significant.
Technical indicator comparative analysis:
Note: standard condition is that 214 pipelines mend the operating condition that cold liquid nitrogen flow is zero；
Minimum operating condition is the operating condition that 217 duct products liquid nitrogen flows are zero；
It needs to mend cold operating condition using liquid nitrogen in storage tank, is extreme case, does not list here.
Detailed description of the invention
Fig. 1 is the working principle diagram of the utility model.
In figure: 1- self-cleaning air filter, 2- air compressor, 3- molecular sieve, 4- main heat exchanger, 5- liquefaction heat exchange
Device, tower under 6-, 7- main condenser evaporator, the upper tower of 8-, 9- circulating liquid nitrogen pump, 10- gas-liquid separator, 11-LNG- nitrogen heat exchanger,
12-LNG- ethylene glycol heat exchanger, 13- liquid booster expansion machine, 14- regenerate hot-air heater, 15- ethylene glycol solution circulating pump, 16-
First vent muffler, the second vent muffler of 17-.
101- primary filtration air, 102- compressed air, the pure compressed air of 103-, 104- liquid compressed air, 105-
Gas-liquid mixed compressed air, 106- oxygen-enriched liquid air, the cold liquid nitrogen of 201- master, 202/203- nitrogen, 204/205- medium pressure nitrogen gas, 206-
Middle hydraulic fluid nitrogen, 207- liquid nitrogen, tower nitrogen under 208-, the auxiliary cold liquid nitrogen of 209-, 210- gas-liquid mixed nitrogen, 211- nitrogen, 212/
213- liquid nitrogen, the cold liquid nitrogen of 214- benefit, 215- liquid nitrogen, 216- starting liquid nitrogen, 217/218- nitrogen products, 301- product liquid oxygen,
Dirt nitrogen, 403- room temperature dirt nitrogen, the overcritical liquid nitrogen of 501-, the overcritical nitrogen at room of 502-, the overcritical liquid of 503-
Nitrogen, 601/602/603-LNG, 604- low temperature NG, 605/606/607- room temperature NG, 701/702- high temperature glycol aqueous solution,
703- low-temperature glycol aqueous solution.
Specific embodiment
In order to clarify the technical characteristics of the invention, below by specific embodiment, and in conjunction with attached drawing, it is practical to this
It is novel to be described further.
A kind of space division system using cold energy of liquefied natural gas, including air gas separation unit, LNG cold energy use unit and second
Glycol solution circulating cooling unit；
The ethylene glycol solution circulating cooling unit includes LNG- ethylene glycol heat exchanger 12 and ethylene glycol solution circulating pump 15；
The LNG cold energy use unit includes circulating liquid nitrogen pump 9, LNG- nitrogen heat exchanger 11, gas-liquid separator 10, liquid increasing
Compression swelling machine 13 and the second vent muffler 17；
The air gas separation unit includes self-cleaning air filter 1, air compressor 2, molecular sieve 3, regeneration gas heating
Device 14, main heat exchanger 4, liquefaction heat exchanger 5, rectifying column and the first vent muffler 16, rectifying column include lower tower 6, main condenser steaming
Send out device 7 and 8 three parts of upper tower.
In the air gas separation unit:
The outlet of self-cleaning air filter 1 is connected with 2 entrance of air compressor；3 entrance of molecular sieve and air pressure
The outlet of contracting machine 2 is connected with the first vent muffler 16；The outlet of molecular sieve 3 is connected with main heat exchanger 4 and regeneration hot-air heater 14；
4 hot end of main heat exchanger and cold end have three strands, hot end respectively with the outlet of molecular sieve 3, LNG- nitrogen heat exchanger
11 hot ends are connected with regeneration hot-air heater 14；Cold end respectively with a hot end of liquefaction heat exchanger 5 and cold end, a circulating liquid nitrogen
The outlet of pump 9 is connected；
5 hot end of liquefaction heat exchanger and cold end have six strands；Cold end respectively with 4 one cold ends of main heat exchanger, upper tower 8
Top is connected with top, 6 top of lower tower, 10 top of gas-liquid separator with top；Hot end respectively with lower 6 bottom and top of tower, master
One cold end of heat exchanger 4, a hot end of LNG- nitrogen heat exchanger 11 are connected with the pressurization end entrance of liquid booster expansion machine 13；
The top of the lower tower 6 be equipped with two groups of outlets and entrance, wherein one group respectively with the hot end of main condenser evaporator 7 and
Cold end is connected, and another group is connected with the hot end of liquefaction heat exchanger 5 and cold end respectively；Bottom inlet and 5 hot end phase of liquefaction heat exchanger
Even, outlet at bottom is connected through throttle valve with upper 8 top of tower；
Be connected at the top of 7 entrance of main condenser evaporator and lower tower 6, outlet is divided into three strands, respectively with 6 top of lower tower,
Product liquid oxygen storage tank and through being connected at the top of throttle valve and upper tower 8；
The outlet of upper tower 8 is divided into three strands, is that top first outlet is connected with nitrogen products storage tank respectively, top second
Outlet and upper outlet are connected with two bursts of cold ends of liquefaction heat exchanger 5 respectively；Top and top two entrances respectively with main condenser
Evaporator 7 is connected with lower 6 bottom of tower.
It is two that the molecular sieve 3, which is divided to, is used alternatingly, one regeneration of a purifying；The entrance and air for purifying end compress
The outlet of machine 2 is connected, and the outlet for purifying end is connected with the hot end of main heat exchanger 4；The entrance caused trouble again goes out with regeneration hot-air heater 14
Mouth is connected, then the outlet caused trouble is connected with the first vent muffler 16.
In the ethylene glycol solution circulating cooling unit:
12 hot end of LNG- ethylene glycol heat exchanger and cold end have two strands, two stocks of cold end not with cryogenic natural gas pipe
Road is connected with two interstage coolers of air compressor 2 with aftercooler entrance, and two stocks in hot end are not and natural gas tube
Road is connected with the outlet of ethylene glycol solution circulating pump 15；
15 entrance of ethylene glycol solution circulating pump exports phase with 2 interstage cooler of air compressor and aftercooler
Even, outlet is connected with 12 hot end of LNG- ethylene glycol heat exchanger.
In the LNG cold energy use unit:
The circulating liquid nitrogen pumps 9 entrances and is connected with 10 bottom of gas-liquid separator, and outlet is connected with 4 cold end of main heat exchanger；
10 top exit of gas-liquid separator is connected with 5 two bursts of cold ends of liquefaction heat exchanger respectively with upper entrance, top
Another entrance is connected with liquid nitrogen product storage tank, and outlet at bottom pumps 9 entrances, nitrogen products storage tank and LNG- with circulating liquid nitrogen respectively
Nitrogen heat exchanger 11 is connected；Centre entrance is connected with the outlet of 13 expanding end of liquid booster expansion machine；
The liquid booster expansion machine 13 divides for pressurized end and expanding end, the pressurization end entrance with 5 liang of liquefaction heat exchanger
A hot end is connected, and outlet is connected with 11 hot end of LNG- nitrogen heat exchanger；The expansion end entrance and 11 cold end phase of LNG- nitrogen heat exchanger
Even, outlet is connected with gas-liquid separator 10；
11 cold end of LNG- nitrogen heat exchanger have five strands, hot end have four strands, cold end respectively with LNG pipeline, liquefaction heat exchanger 5
Hot end, liquid booster expansion machine 13 expand end entrance, LNG- ethylene glycol heat exchanger 12 is connected with 10 bottom of gas-liquid separator；Hot end
It is exported respectively with natural gas line, 13 pressurized end of liquid booster expansion machine, 17 phase of 4 hot end of main heat exchanger and the second vent muffler
Even.
One heat exchanger channels is arranged in the LNG- nitrogen heat exchanger 11, and both ends disappear with gas-liquid separator 10 and the second emptying respectively
Sound device 17 is connected, and uses to open in LNG cold energy deficiency；Heat exchange gas channel middle extract out one 604, with adjust input
The cooling capacity of LNG- ethylene glycol heat exchanger 12.
One pipeline 216 being connected with nitrogen products tank is arranged in the gas-liquid separator 10, makes in space division system starting
With liquid nitrogen enters the space division system of cold energy of liquefied natural gas in extraction liquid nitrogen storage tank, facilitates and opens key equipment circulating liquid nitrogen pump
9。
The main heat exchanger 4, liquefaction heat exchanger 5, LNG- nitrogen heat exchanger 11 are plate heat exchangers, and are by individual one
It is a or be made of multiple points of heat exchangers, avoid Temperature cross-over in heat exchanger.
Air separating method is carried out using the space division system of above-described embodiment cold energy of liquefied natural gas, comprising the following steps:
A) raw air compresses after self-cleaning strainer 1 removes most of solid impurity into air compressor 2, leads to
Over-molecular sieve system 3 obtains pure air 103 after removing the impurity such as water removal, hydrocarbon；
B) pure air 103 is in main heat exchanger 4 by extracting out and providing in liquefaction heat exchanger 5 cold with upper 8 top of tower
It measures and the dirty nitrogen 402 of preliminary re-heat and cycle of higher pressure liquid nitrogen 501 exchanges heat and be cooled and liquefy.It is completely multiple in main heat exchanger
The dirty nitrogen 403 of heat connects purification system 3 and does regeneration gas and cold blowing gas；
C) air 104 after liquefying provides cooling capacity in liquefaction heat exchanger 5 for liquefaction pressure nitrogen 205 and 208, and multiple
Heat enters in rectifying tower system for gas-liquid mixed air 105 is separated into discharge logistics, and the discharge logistics includes from upper 7 top of tower
The dirty nitrogen 401 that obtained pure nitrogen gas 202 and liquid nitrogen product 218,7 top Cong Shangta obtain, the liquid oxygen obtained from upper tower bottom
301；
D) raw air 105 obtains oxygen-enriched liquid air 106 in lower 6 bottom of tower, in lower tower 6 in lower tower 6 after initial gross separation
Top obtains medium pressure nitrogen gas, and medium pressure nitrogen gas enters main condenser evaporator 7, is condensed into liquid nitrogen by the liquid oxygen of upper 8 bottom of tower, the liquid nitrogen
A part send lower tower 6 back to maintain the rectifying operating condition of lower tower 6, the throttling of another part liquid nitrogen 201 is sent at the top of upper tower 8 and participates in essence
It evaporates；In addition it extracts one pressure nitrogen gas 208 out and enters liquefaction heat exchanger 5, lower tower 6 is returned after being liquefied and does phegma；Oxygen-enriched liquid air
It is sent into after 106 throttlings in the middle part of upper tower 8 and participates in the rectifying of upper tower 8；
E) liquid nitrogen 201, oxygen-enriched liquid air 106 and the gas oxygen progress of the evaporation of main condenser evaporator 7 for being sent into upper tower are smart again
It evaporates, low-pressure nitrogen 202 and liquid nitrogen 218 is obtained at the top of Cong Shangta 8,8 top Cong Shangta obtains dirty nitrogen 401, main condenser evaporator 7
Top be connected to upper 8 bottom of tower, obtain liquid oxygen in upper 8 bottom of tower, from main condenser evaporator 7 extraction for gasification liquid oxygen
301, it sends out and is used as product liquid oxygen；The re-heat in liquefaction heat exchanger 5 and main heat exchanger 4 of dirty nitrogen 401 obtained from upper 8 top of tower
It heats up out and is divided into two-way after air gas separation unit, dirty nitrogen is regenerated hot-air heater 16 type air purifier 3 is gone to be used as to regenerate all the way
Gas goes vent muffler to be vented as the dirty nitrogen of emptying all the way；If space division has ar system, Argon fraction is obtained in the middle part of upper tower,
Argon fraction is sent into full distillation non hydrogen argon producing system and produces product liquid argon, which is known to industry technical staff,
It is not repeated herein；
F) a part of liquid nitrogen 213 obtained in gas-liquid separator 10 is pressurised into supercritical pressure into circulating liquid nitrogen pump 9
Liquid nitrogen 501 simultaneously enters after 4 re-heat of main heat exchanger is room temperature, is cooled into LNG- nitrogen heat exchanger 11 by high pressure LNG602 overcritical
Liquid nitrogen 503 obtains LNG cold energy；Enter 13 expanding end of liquid booster expansion machine after liquefaction and is expanded to low-pressure gas-liquid mixing nitrogen
210, nitrogen 211 and liquid nitrogen are separated into gas-liquid separator 10；The pure nitrogen gas 202 and nitrogen 211 extracted out at the top of upper tower 8 enter
Liquefaction heat exchanger 5 provides cooling capacity, and nitrogen 203 is mixed into after re-heat and enters 13 pressurized end boil down to low pressure of liquid booster expansion machine
Nitrogen 204, into LNG- nitrogen heat exchanger 11 it is cooled after to enter back into liquefaction heat exchanger 5 further cooling and liquefy as liquid nitrogen 206,
Enter gas-liquid separator 10 after throttling, is mixed into liquid nitrogen 212 with the liquid nitrogen separated after expansion；
G) tri- tunnel 212 Fen Wei of liquid nitrogen in gas-liquid separator 10, circulating liquid nitrogen 213, nitrogen products 217 and the cold liquid nitrogen of benefit
214；213 flow of circulating liquid nitrogen immobilizes, and when LNG601 meets requirement of system design, mending cold 214 flow of liquid nitrogen is 0, when
When LNG601 flow is higher than design temperature or two kinds of situations while occurring lower than design discharge or temperature, reduced by actual conditions
217 flow of nitrogen products increases and mends cold 214 flow of liquid nitrogen, to maintain system stable operation；It, can also be by opening under extreme case
The pipeline of hydrodynamic nitrogen 216 is mended cold using liquid nitrogen in storage tank；
H) LNG601 gasifies after exchanging heat to go out the natural gas 604 and 605 of LNG- nitrogen heat exchanger 11, middle pumping natural gas 604
Temperature is still below 0 degree, exchanges heat in ethylene glycol heat exchanger 12 after mixing LNG603 with glycol water 701, obtains LNG603
It is situated between with the glycol water 703 of 604 cold energy of natural gas as 2 interstage cooler of air compressor and the cooling of aftercooler
Matter, the glycol water 702 after heat exchange pressurize through ethylene glycol solution circulating pump 15, return ethylene glycol heat exchanger 12 and carry out circulating picture-changing
Heat, LNG603 and natural gas 604 are warming up to normal-temperature natural-gas 606 and mix feeding gas distributing system 607 with natural gas 605.
Although the embodiments of the present invention are described above in conjunction with attached drawing, the utility model does not limit to
In above-mentioned specific embodiment, the above mentioned embodiment is only schematical, be not it is restrictive, this field
Those of ordinary skill is not departing from the utility model aims and scope of the claimed protection under the enlightenment of the utility model
In the case of, many forms can also be made, these are belonged within the protection scope of the utility model.
Claims (8)
1. a kind of space division system using cold energy of liquefied natural gas, it is characterised in that: including air gas separation unit, LNG cold energy benefit
With unit and ethylene glycol solution circulating cooling unit；
The ethylene glycol solution circulating cooling unit includes LNG- ethylene glycol heat exchanger (12) and ethylene glycol solution circulating pump (15)；
The LNG cold energy use unit includes that circulating liquid nitrogen pumps (9), LNG- nitrogen heat exchanger (11), gas-liquid separator (10), liquid
Booster expansion machine (13) and the second vent muffler (17)；
The air gas separation unit adds comprising self-cleaning air filter (1), air compressor (2), molecular sieve (3), regeneration gas
Hot device (14), main heat exchanger (4), liquefaction heat exchanger (5), rectifying column and the first vent muffler (16), rectifying column include lower tower
(6), main condenser evaporator (7) He Shangta (8) three parts.
2. a kind of space division system using cold energy of liquefied natural gas according to claim 1, which is characterized in that the air
In separative unit:
Self-cleaning air filter (1) outlet is connected with air compressor (2) entrance；Molecular sieve (3) entrance and air
Compressor (2) outlet is connected with the first vent muffler (16)；It is heated with main heat exchanger (4) and regeneration gas molecular sieve (3) outlet
Device (14) is connected；
Main heat exchanger (4) hot end and cold end have three strands, hot end respectively with molecular sieve (3) outlet, LNG- nitrogen heat exchanger
(11) hot end is connected with regeneration hot-air heater (14)；Cold end respectively with a hot end of liquefaction heat exchanger (5) and a cold end, follow
The outlet of ring liquid nitrogen pump (9) is connected；
Liquefaction heat exchanger (5) hot end and cold end have six strands；Cold end respectively with main heat exchanger (4) cold ends, a upper towers
(8) top is connected with top, lower tower (6) top, gas-liquid separator (10) top with top；Hot end respectively with lower tower (6) bottom
With top, a cold end of main heat exchanger (4), a hot end of LNG- nitrogen heat exchanger (11) and liquid booster expansion machine (13)
End entrance is pressurized to be connected；
The top of the lower tower (6) be equipped with two groups of outlets and entrance, wherein one group respectively with the hot end of main condenser evaporator (7) and
Cold end is connected, and another group is connected with the hot end of liquefaction heat exchanger (5) and cold end respectively；Bottom inlet and liquefaction heat exchanger (5) heat
End is connected, and outlet at bottom is connected through throttle valve with upper tower (8) top；
It is connected at the top of main condenser evaporator (7) entrance and lower tower (6), outlet is divided into three strands, pushes up respectively with lower tower (6)
Portion, product liquid oxygen storage tank and through being connected at the top of throttle valve and upper tower (8)；
Upper tower (8) outlet is divided into three strands, is that top first outlet is connected with nitrogen products storage tank respectively, top second goes out
Mouth and upper outlet are connected with two bursts of cold ends of liquefaction heat exchanger (5) respectively；Top and top two entrances respectively with main condenser
Evaporator (7) (6) bottom He Xiata is connected.
3. a kind of space division system using cold energy of liquefied natural gas according to claim 2, it is characterised in that: the molecule
Sieve (3) is divided into two, is used alternatingly, one regeneration of a purifying；The entrance for purifying end is connected with air compressor (2) outlet,
The outlet at purifying end is connected with the hot end of main heat exchanger (4)；The entrance caused trouble again is connected with regeneration hot-air heater (14) outlet, then
The outlet caused trouble is connected with the first vent muffler (16).
4. a kind of space division system using cold energy of liquefied natural gas according to claim 1, which is characterized in that the second two
In alcoholic solution circulating cooling unit:
The LNG- ethylene glycol heat exchanger (12) hot end and cold end have two strands, two stocks of cold end not with cryogenic natural gas pipeline
Be connected with air compressor (2) interstage cooler with aftercooler entrance, two stocks in hot end not with natural gas line and second
Glycol solution circulating pump (15) outlet is connected；
Ethylene glycol solution circulating pump (15) entrance exports phase with air compressor (2) interstage cooler and aftercooler
Even, outlet is connected with LNG- ethylene glycol heat exchanger (12) hot end.
5. a kind of space division system using cold energy of liquefied natural gas according to claim 1, which is characterized in that the LNG
In cold energy use unit:
Circulating liquid nitrogen pump (9) entrance is connected with gas-liquid separator (10) bottom, and outlet is connected with main heat exchanger (4) cold end；
Gas-liquid separator (10) top exit is connected with (5) two bursts of cold ends of liquefaction heat exchanger respectively with one, top entrance,
Another entrance of top is connected with liquid nitrogen product storage tank, and outlet at bottom pumps (9) entrance, nitrogen products storage tank with circulating liquid nitrogen respectively
It is connected with LNG- nitrogen heat exchanger (11)；Centre entrance is connected with the outlet of liquid booster expansion machine (13) expanding end；
The liquid booster expansion machine (13) is divided into pressurized end and expanding end, the pressurization end entrance and liquefaction heat exchanger (5) two
A hot end is connected, and outlet is connected with LNG- nitrogen heat exchanger (11) hot end；The expansion end entrance and LNG- nitrogen heat exchanger (11) are cold
End is connected, and outlet is connected with gas-liquid separator (10)；
LNG- nitrogen heat exchanger (11) cold end have five strands, hot end have four strands, cold end respectively with LNG pipeline, liquefaction heat exchanger (5)
Hot end, liquid booster expansion machine (13) expansion end entrance, LNG- ethylene glycol heat exchanger (12) and gas-liquid separator (10) bottom phase
Even；It is put respectively with natural gas line, the outlet of liquid booster expansion machine (13) pressurized end, main heat exchanger (4) hot end and second in hot end
Empty muffler (17) is connected.
6. a kind of space division system using cold energy of liquefied natural gas according to claim 5, it is characterised in that: the LNG-
Nitrogen heat exchanger (11) is arranged one heat exchanger channels, both ends respectively with gas-liquid separator (10) and the second vent muffler (17) phase
Even, it opens and uses in LNG cold energy deficiency；Heat exchange gas channel middle extracts one natural gas (604) out, to adjust input
The cooling capacity of LNG- ethylene glycol heat exchanger (12).
7. a kind of space division system using cold energy of liquefied natural gas according to claim 5, it is characterised in that: the gas-liquid
One pipeline (216) being connected with nitrogen products tank is arranged in separator (10), uses in space division system starting.
8. a kind of space division system using cold energy of liquefied natural gas according to claim 2 or 5, it is characterised in that: described
Main heat exchanger (4), liquefaction heat exchanger (5), LNG- nitrogen heat exchanger (11) are by individual one or by multiple points of heat exchangers
Composition, avoid Temperature cross-over in heat exchanger.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529208A (en) * | 2019-07-24 | 2019-12-03 | 西安交通大学 | A kind of LNG cold energy cascade utilization control system and control method |
| CN111306891A (en) * | 2020-02-20 | 2020-06-19 | 济南诚信气体有限公司 | Preparation process of oxygen |
| WO2022047878A1 (en) * | 2020-09-01 | 2022-03-10 | 刘传林 | Liquid gas industrialized application system |
| CN115959683A (en) * | 2021-10-09 | 2023-04-14 | 四川大学 | Cold-heat-kinetic energy complementary process and system for refining liquid hydrogen and liquid nitrogen and coproducing synthetic ammonia |
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2018
- 2018-08-24 CN CN201821373558.4U patent/CN208751137U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529208A (en) * | 2019-07-24 | 2019-12-03 | 西安交通大学 | A kind of LNG cold energy cascade utilization control system and control method |
| CN110529208B (en) * | 2019-07-24 | 2020-11-10 | 西安交通大学 | LNG cold energy cascade utilization control system and control method |
| CN111306891A (en) * | 2020-02-20 | 2020-06-19 | 济南诚信气体有限公司 | Preparation process of oxygen |
| WO2022047878A1 (en) * | 2020-09-01 | 2022-03-10 | 刘传林 | Liquid gas industrialized application system |
| CN115959683A (en) * | 2021-10-09 | 2023-04-14 | 四川大学 | Cold-heat-kinetic energy complementary process and system for refining liquid hydrogen and liquid nitrogen and coproducing synthetic ammonia |
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