CN106839648A - A kind of ethylene unit flare gas recovery technique - Google Patents
A kind of ethylene unit flare gas recovery technique Download PDFInfo
- Publication number
- CN106839648A CN106839648A CN201710102053.8A CN201710102053A CN106839648A CN 106839648 A CN106839648 A CN 106839648A CN 201710102053 A CN201710102053 A CN 201710102053A CN 106839648 A CN106839648 A CN 106839648A
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- CN
- China
- Prior art keywords
- gas
- temperature
- nitrogen
- lighter hydrocarbons
- torch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
- F25J1/007—Primary atmospheric gases, mixtures thereof
- F25J1/0072—Nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The present invention relates to a kind of ethylene unit flare gas recovery technique, original accident condition is put into the gas containing light hydrocarbon of torch, feeding forecooler is with vaporization nitrogen heat exchange without being re-fed into torch, liquefaction tower is sent into after the reduction of lighter hydrocarbons temperature, lighter hydrocarbons temperature is reduced to more than the following solidification temperature of condensing temperature, make lighter hydrocarbons that special storage tank is sent into after liquefying, fixed gas storage tank of the feeding equipped with adsorbent, unadsorbed gas is put into torch；Lighter hydrocarbons liquefaction tower uses liquid nitrogen as liquefaction low-temperature receiver, and forecooler is sent into after liquid nitrogen vaporization, and heated nitrogen is directly vented, and thus reclaims the light hydrocarbon gas of accident condition emptying；Liquefied light hydrocarbon reclaims cold during ethylene unit is sent in evaporation back to.
Description
Technical field
It is a kind of effectively reduction ethylene production accident gas burning emptying the present invention relates to chemical industry, energy-saving and environmental protection field
Method.
Background technology
For the process with lighter hydrocarbons as raw materials for ethylene production, the processing method for light hydrocarbon accident gas typically uses two
The method of kind.
A kind of method is to be put into gas holder, after accident terminates, sends accident gas pressurized back to original production device.The method safety
And environmental protection, but because equipment investment is too big, it is impossible to recoup the investment, and then, only environmental protection few using the enterprise of the method
It is required that and its it is strict, enterprise can just make process accident gas in this way.
A kind of method is to be sent directly into torch burning.The method safety but environmental hazard is larger, due to equipment investment seldom, enters
And use the enterprise of the method extremely many.
The content of the invention
Liquefaction nitrogen is easily stored, and cheap and easy to get, safeguards keep the cost of liquefaction nitrogen very low for a long time.Safeguard liquid
Change nitrogen procedure and have part liquid nitrogen vaporization, collect the nitrogen system that vaporization nitrogen send ethylene unit, it is possible to reduce nitrogen outsourcing
Amount, reduces liquid nitrogen maintenance cost.Nitrogen is nontoxic, and directly emptying is not also injured to environment.
Liquefaction nitrogen is preserved for a long time, the emergent low-temperature receiver as process accident gas, the low-temperature receiver of liquid nitrogen fast vaporizing is used
By former torch gas liquefaction, former torch gas can be eliminated with the low input of low cost.
The method of the present invention, is actually replaced with the cold of liquefaction nitrogen and gives light hydrocarbon gas, makes hydrocarbon gas quick
Liquefaction is stored, and the equipment of liquid nitrogen only has the 31 percent of gas holder plus hydro carbons volume of equipment, and occupation of land is small, and investment is far below
Gas holder.
The present invention is a kind of ethylene unit flare gas recovery technique, it is characterised in that original accident condition is put into torch
Light hydrocarbon gas, feeding forecooler, without being re-fed into torch, sends into liquefaction tower with the heat exchange of vaporization nitrogen after the reduction of lighter hydrocarbons temperature, will be light
Hydrocarbon temperature is reduced to below condensing temperature but higher than solidification temperature, lighter hydrocarbons is sent into special hydro carbons storage tank after liquefying, and realizes hydro carbons
Reclaim.
If in order to reduce investment, for fixed gas, can directly send torch burning.
More environmentally friendly method is that, by fixed gas storage tank of the feeding equipped with adsorbent, adsorbing separation hydro carbons uses up hydrocarbon gas
The many recovery of amount, unadsorbed gas is put into torch.
Hydro carbons liquefaction tower uses the liquid nitrogen of long-term storage as fast liquefying low-temperature receiver, and liquid nitrogen fast vaporizing quickly obtains liquid
Change hydro carbons.Vaporization nitrogen feeding forecooler, heated nitrogen is directly vented, and thus reclaims ethylene unit accident hydrocarbon gas.
Liquefied light hydrocarbon can reclaim cold during ethylene unit is sent in pressurization evaporation back to.
Specific embodiment
Embodiment 1：The light hydrocarbon gas gross of accident of certain 300,000 tons of ethylene unit release is 200 tons, release it is normal
Pressure hydrocarbon gas total measurement (volume) is 140000 mark sides.
600 cubes of design liquid nitrogen storage equipment, stores 480 cubes of liquid nitrogen throughout the year.Regular maintenance discharges nitrogen 100 per hour
Mark cube, is put into ethylene unit nitrogen system.
Before accident occurs, a small amount of liquid nitrogen is used to safeguard liquefaction tower and forecooler temperature that accident to occur simultaneously, liquid nitrogen immediately by
A large amount of to be rapidly injected liquefaction tower, liquid nitrogen vaporization, vaporization nitrogen feeding precooling tower, the hydrocarbon gas of quick release are cooled down by forecooler
Cooling, cooling hydrocarbon gas feeding liquefaction tower fast liquefying, liquefaction hydro carbons out sends into special Liquefied Hydrocarbon hold-up vessel, storage
Vessel volume is established as 400 cubes, and heated nitrogen can directly be vented or recycle.Most of hydro carbons is able to reclaim profit
With.Not liquefied gas introduces adsorption tower, and 200 side's adsorption towers receive hydro carbons to enter in adsorbent, so reclaimed close whole
Hydrocarbon gas.Gas feeding torch burning not to be adsorbed.
Liquid nitrogen price is 1/5th with liquid light hydrocarbon price ratio.Liquid nitrogen is only gas holder system with the maintenance cost of liquefaction system
The 21 percent of system, this method economically feasible, obvious environment benefit.
Accident terminates, and liquefied light hydrocarbon feeding evaporator vaporization, vaporescence can obtain cold, and cold can be used for air fluid
Change, generate electricity etc..
Embodiment 2：The hydrocarbon gas total amount of accident release of certain 600,000 tons of ethylene unit is 400 tons, the normal pressure of release
Hydrocarbon gas total measurement (volume) is 280000 mark sides.
1000 cubes of design liquid nitrogen storage equipment, stores 800 cubes of liquid nitrogen throughout the year.Regular maintenance discharges nitrogen per hour
200 marks cube, are put into ethylene unit nitrogen system.
Before accident occurs, a small amount of liquid nitrogen is used to safeguard liquefaction tower and forecooler temperature that accident to occur simultaneously, liquid nitrogen immediately by
A large amount of to be rapidly injected liquefaction tower, liquid nitrogen vaporization, vaporization nitrogen feeding precooling tower, the hydrocarbon gas of quick release are cooled down by forecooler
Cooling, cooling hydrocarbon gas feeding liquefaction tower fast liquefying, liquefaction hydro carbons out sends into special Liquefied Hydrocarbon hold-up vessel, storage
Vessel volume is established as 800 cubes, and heated nitrogen can directly be vented or recycle.Most of hydro carbons is able to reclaim profit
With.Not liquefied gas introduces adsorption tower, and 400 side's adsorption towers receive hydro carbons to enter in adsorbent, so reclaimed close whole
Hydrocarbon gas.Gas feeding torch burning not to be adsorbed.
Accident terminates, and liquefied light hydrocarbon pressurization feeding evaporator vaporization, vaporescence can obtain cold, and cold can be used for sky
Gas liquefaction, generating etc..
Embodiment 3：The light hydrocarbon gas gross of accident of certain 900,000 tons of ethylene unit release is 600 tons, release it is normal
Body total measurement (volume) of calming the anger is 420000 mark sides.
1500 cubes of design liquid nitrogen storage equipment, stores 1200 cubes of liquid nitrogen throughout the year.Regular maintenance discharges nitrogen per hour
300 marks cube, are put into ethylene unit nitrogen system.
Before accident occurs, a small amount of liquid nitrogen is used to safeguard liquefaction tower and forecooler temperature that accident to occur simultaneously, liquid nitrogen immediately by
A large amount of to be rapidly injected liquefaction tower, liquid nitrogen vaporization, vaporization nitrogen feeding precooling tower, the hydrocarbon gas of quick release are cooled down by forecooler
Cooling, cooling hydrocarbon gas feeding liquefaction tower fast liquefying, liquefaction hydro carbons out sends into special Liquefied Hydrocarbon hold-up vessel, storage
Vessel volume is established as 1200 cubes, and heated nitrogen can directly be vented or recycle.Most of hydro carbons is reclaimed
Utilize.Not liquefied gas introduces adsorption tower, and 600 side's adsorption towers receive hydro carbons to enter in adsorbent, have so reclaimed close to entirely
Portion's hydrocarbon gas.Gas feeding torch burning not to be adsorbed.Liquid nitrogen price is a quarter with liquid light hydrocarbon price ratio.
Accident terminates, and liquefied light hydrocarbon feeding evaporator vaporization, vaporescence can obtain cold, and cold can be used for air fluid
Change, generate electricity etc..
Claims (1)
1. a kind of ethylene unit flare gas recovery technique, it is characterised in that：By original accident condition be put into torch containing light hydrocarbon
Gas, feeding forecooler, without being re-fed into torch, sends into liquefaction tower, by lighter hydrocarbons temperature with the heat exchange of vaporization nitrogen after the reduction of lighter hydrocarbons temperature
Degree is reduced to more than the following solidification temperature of condensing temperature, makes lighter hydrocarbons that special storage tank is sent into after liquefying, and fixed gas feeding is equipped with absorption
The storage tank of agent, unadsorbed gas is put into torch；Lighter hydrocarbons liquefaction tower uses liquid nitrogen as liquefaction low-temperature receiver, and precooling is sent into after liquid nitrogen vaporization
Device, heated nitrogen is directly vented, and thus reclaims the light hydrocarbon gas of accident condition emptying；Liquefied light hydrocarbon sends ethene back in evaporation
Cold is reclaimed during device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710102053.8A CN106839648A (en) | 2017-02-24 | 2017-02-24 | A kind of ethylene unit flare gas recovery technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710102053.8A CN106839648A (en) | 2017-02-24 | 2017-02-24 | A kind of ethylene unit flare gas recovery technique |
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| Publication Number | Publication Date |
|---|---|
| CN106839648A true CN106839648A (en) | 2017-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710102053.8A Pending CN106839648A (en) | 2017-02-24 | 2017-02-24 | A kind of ethylene unit flare gas recovery technique |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858683A (en) * | 2010-04-30 | 2010-10-13 | 浙江大学 | System for producing liquefied natural gas by utilizing liquid nitrogen cold energy |
| CN201628446U (en) * | 2010-04-13 | 2010-11-10 | 济南鲍德气体有限公司 | Recovery system for cold energy released in vaporization of cryogenic liquid |
| CN202501708U (en) * | 2011-12-30 | 2012-10-24 | 宇星科技发展(深圳)有限公司 | Natural gas processing system |
| CN104877724A (en) * | 2015-05-11 | 2015-09-02 | 四川捷贝通能源科技有限公司 | Treatment method for recovering vent natural gas |
| CN105102913A (en) * | 2013-11-07 | 2015-11-25 | 俄罗斯天然气工业公开股份公司 | Natural gas liquefaction method and unit |
| CN105999997A (en) * | 2016-06-29 | 2016-10-12 | 上海立得催化剂有限公司 | Treating method for discontinuous small-flow light-dydrocarbon-containing tail gas at low light dydrocarbon concentration |
-
2017
- 2017-02-24 CN CN201710102053.8A patent/CN106839648A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201628446U (en) * | 2010-04-13 | 2010-11-10 | 济南鲍德气体有限公司 | Recovery system for cold energy released in vaporization of cryogenic liquid |
| CN101858683A (en) * | 2010-04-30 | 2010-10-13 | 浙江大学 | System for producing liquefied natural gas by utilizing liquid nitrogen cold energy |
| CN202501708U (en) * | 2011-12-30 | 2012-10-24 | 宇星科技发展(深圳)有限公司 | Natural gas processing system |
| CN105102913A (en) * | 2013-11-07 | 2015-11-25 | 俄罗斯天然气工业公开股份公司 | Natural gas liquefaction method and unit |
| CN104877724A (en) * | 2015-05-11 | 2015-09-02 | 四川捷贝通能源科技有限公司 | Treatment method for recovering vent natural gas |
| CN105999997A (en) * | 2016-06-29 | 2016-10-12 | 上海立得催化剂有限公司 | Treating method for discontinuous small-flow light-dydrocarbon-containing tail gas at low light dydrocarbon concentration |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170613 |
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| RJ01 | Rejection of invention patent application after publication |