CN109405413A - A kind of coalbed methane containing oxygen low temperature distillation system that avoiding explosion limit and method - Google Patents
A kind of coalbed methane containing oxygen low temperature distillation system that avoiding explosion limit and method Download PDFInfo
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- CN109405413A CN109405413A CN201811370337.6A CN201811370337A CN109405413A CN 109405413 A CN109405413 A CN 109405413A CN 201811370337 A CN201811370337 A CN 201811370337A CN 109405413 A CN109405413 A CN 109405413A
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- methane
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- methane content
- gas
- intake line
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 358
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000001301 oxygen Substances 0.000 title claims abstract description 27
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 27
- 238000004880 explosion Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005292 vacuum distillation Methods 0.000 title claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 56
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 29
- 239000003245 coal Substances 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 5
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 239000003949 liquefied natural gas Substances 0.000 description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
- F25J3/0223—H2/CO mixtures, i.e. synthesis gas; Water gas or shifted synthesis gas
-
- 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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
- F25J3/0209—Natural gas or substitute natural gas
-
- 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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
-
- 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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0257—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of nitrogen
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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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0295—Start-up or control of the process; Details of the apparatus used, e.g. sieve plates, packings
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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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/02—Processes or apparatus using separation by rectification in a single pressure main column system
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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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/40—Features relating to the provision of boil-up in the bottom of a column
-
- 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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
-
- 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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/40—Air or oxygen enriched air, i.e. generally less than 30mol% of O2
-
- 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
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/04—Recovery of liquid products
-
- 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
- F25J2280/00—Control of the process or apparatus
- F25J2280/02—Control in general, load changes, different modes ("runs"), measurements
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (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 discloses the low temperature distillation system and method for a kind of coalbed methane containing oxygen for avoiding explosion limit, which includes rectifying column, reboiler, coal bed gas intake line, liquid nitrogen intake line, circulation methane pipeline, gas exhaust piping and liquid methane output pipe.Coalbed methane containing oxygen enters in the middle part of rectifying column, gas part is used as the stripping of rectifying section upwards, mass-and heat-transfer is carried out with liquid on column plate to exchange, liquid nitrogen sprays at the top of rectifying column, phegma as rectifying column, by the way that online methane content detector is arranged, monitor the methane content of the gas-phase space between the methane content and second block of column plate and first block of column plate of the gas-phase space between at the top of first block of column plate and tower body in real time, ensure that the methane content of the gas-phase space between at the top of first block of column plate and tower body is always maintained at less than 5%, the methane content of gas-phase space between second block of column plate and first block of column plate is greater than 15% or less than 5%, explosion limit is avoided to realize.
Description
Technical field
The present invention relates to coal bed gas processing techniques, in particular, it is low to be related to a kind of coalbed methane containing oxygen for avoiding explosion limit
Warm distillation system and method.
Background technique
Low concentration coal-bed gas not only contains 20% ~ 50% methane, but also the air containing a large amount of nitrogen, oxygen gas component,
It is the adverse factor in coal production, it not only pollutes air, but also when coal bed gas content is 5%~16% in air, meets fire
It can set off an explosion, cause safety accident.
The fixed gases such as oxygen, nitrogen in coalbed methane containing oxygen are isolated using the method for low-temperature fractionating tower, rectifier bottoms
High-purity methane is obtained, preparing liquefied natural gas is used to, tower top discharge goes out the fixed gases such as oxygen, nitrogen.Inside rectifying column from it is lower to
On stripping component in methane volumetric score by 98% be reduced to 2%, there is the risk for passing through explosion limit 5% ~ 15%, it is serious to reduce
The safety of rectifying column, therefore, it is necessary to design a kind of coalbed methane containing oxygen low temperature distillation system for avoiding explosion limit.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide it is a kind of it is reasonable in design,
It handles the low temperature distillation system of coalbed methane containing oxygen with capable of avoiding explosion limit, and provides specific method step.
Technical solution used by the present invention solves the above problems is: a kind of coalbed methane containing oxygen for avoiding explosion limit is low
Warm distillation system, including rectifying column, it is characterised in that: further include reboiler, coal bed gas intake line, liquid nitrogen intake line, follow
Ring methane pipeline, gas exhaust piping and liquid methane output pipe；The rectifying column be plate column, including tower body and be located at the tower
Body bottom and it is used to collect the tower seat cavity of liquid, is provided with several column plates, column plate end peace inside the tower body from top to bottom
Equipped with overflow pipe；The methane for detecting the gas-phase space between at the top of first block of column plate and tower body is provided on the tower body to contain
The online methane content detector of the No.1 of amount, the methane for detecting the gas-phase space between second block of column plate and first block of column plate
The online methane content detector of No. two of content and No. three online methane content detectors for tower body bottom methane content；
The reboiler is mounted in tower seat cavity；The circulation methane pipeline passes through tower seat cavity and connect with reboiler, for again
It boils device and heat source is provided；The Level meter for detecting liquid level in tower seat cavity is provided on the tower seat cavity；The liquid
One end of methane output pipe is connect with tower seat cavity bottom, and the other end is connect with external LNG storage tank, liquid methane output pipe
On be provided with Liquid level adjusting valve, the Level meter and Liquid level adjusting valve communicate to connect；The one of the coal bed gas intake line
End is led in the middle part of tower body, and tower body top is led in one end of the liquid nitrogen intake line, connect at the top of the tower body with gas exhaust piping；
It is provided with No. four online methane content detectors on the coal bed gas intake line, No. five are provided on the gas exhaust piping online
Methane content detector, is provided with No.1 flow control valve on the liquid nitrogen intake line, No. four online methane content detectors,
No. five online methane content detectors are communicated to connect with No.1 flow control valve.
Preferably, pressure detecting instrument and pressure-control valve, pressure detecting instrument are additionally provided on gas exhaust piping of the present invention
It is communicated to connect with pressure-control valve.
Preferably, circulation methane pipeline of the present invention includes the circulation methane being sent into reboiler for that will recycle methane
It is intake line, defeated for circulation methane output pipe that methane is exported from reboiler and the connection circulation methane will to be recycled
Enter pipeline and recycle the adjusting bypass of methane output pipe, adjusts and is provided with No. two flow control valves in bypass, circulation methane is defeated
Enter to be provided with No. six online methane content detectors, No. six online methane content detectors and No. three online methane contents on pipeline
Detector is communicated to connect with No. two flow control valves.
In order to solve the above technical problems, the present invention also provides another technical solutions: a kind of oxygen-containing coal for avoiding explosion limit
Layer gas cryogenic rectification method, comprising the following steps:
Step 1: liquid nitrogen sprays into tower body top by liquid nitrogen intake line, as the phegma of rectifying column, by control certain low
Coalbed methane containing oxygen under temperature state is input into the middle part of tower body by coal bed gas intake line, and coalbed methane containing oxygen gas phase portion is past upper
It is dynamic, carry out heat and mass transport exchange with the liquid nitrogen on column plate and contact, the methane in uprising gas be condensed flow downward until into
Enter and is collected in tower seat cavity；The on-condensible gases such as nitrogen and oxygen realize enrichment in uprising gas, continue up and flow into
In gas exhaust piping, methane content in No. four online methane content detector test coalbed methane containing oxygens, No. five online methane content inspections
Survey methane content in instrument detection gas exhaust piping；
Step 2: it is passed through methane into reboiler by recycling methane intake line, as the heat source of reboiler, produces reboiler
Raw upward stripping；
Step 3: one is adjusted according to the detection numerical value of No. four online methane content detectors and No. five online methane content detectors
The aperture of number flow control valve, so that the methane content for controlling the online methane content detector test of No.1 is always maintained at and is less than
5%, the methane content of No. two online methane content detector tests of control is greater than 15% or less than 5%；Contained according to No. six online methane
The detection numerical value for measuring detector and No. three online methane content detectors adjusts No. two flow control valves, and control enters reboiler
The flow of methane is recycled, the stripping amount of rectifier bottoms temperature and rising is further controlled；According to the testing number of pressure detecting instrument
Value, adjusts the aperture of pressure-control valve, to control the operating pressure of rectifying column；By the detection numerical value of Level meter, adjust
The aperture for saving Liquid level adjusting valve, so that the liquid methane collected in tower seat cavity is output in external LNG storage tank in time.
Compared with prior art, the present invention having the following advantages that and effect:
1, entire distillation system perfect in shape and function, is able to achieve and handles coalbed methane containing oxygen with avoiding explosion limit, by the way that online first is arranged
Alkane content detection instrument monitors the methane content and second piece of tower of the gas-phase space between at the top of first block of column plate and tower body in real time
The methane content of gas-phase space between plate and first block of column plate, it is ensured that the gas-phase space between at the top of first block of column plate and tower body
Methane content be always maintained at the methane content less than the gas-phase space between 5%, second block of column plate and first block of column plate and be greater than
15% or less than 5%, explosion limit is avoided to realize；
2, heat source of the circulation methane as rectifying column tower bottom reboiler, the methane content of reboiler is entered by adjusting Bypass Control,
The further stripping amount that control rises, with methane concentration in this control tower bottom liquefied natural gas；
3, liquid nitrogen sprays at the top of rectifying column, as the phegma of rectifying column, the methane in uprising gas is condensed, liquid nitrogen is by gas
Formation gas, condensate liquid constantly flow downward, and the methane concentration in condensate liquid is continuously improved, the liquid come out from rectifier bottoms
It is the methane of high concentration, draws and store as liquefied natural gas product.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Description of symbols: coal bed gas intake line 1, liquid methane output pipe 2, gas exhaust piping 3, liquid nitrogen intake line
4, it recycles methane intake line 5, adjust bypass 7, circulation methane output pipe 8, rectifying column 11, tower body 12, column plate 13, overflow pipe
14, the online methane content detector of tower seat cavity 15, reboiler 16, No.1 37, two online methane contents detector 38, three
Online online methane content detector 34, five of methane content detector 35, four online methane content detector 32, six exists
Line methane content detector 36, Level meter 31, pressure detecting instrument 33, Liquid level adjusting valve 51, pressure-control valve 53, No.1 stream
52, No. two flow control valves 54 of adjustable valve.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1.
The present embodiment is a kind of coalbed methane containing oxygen low temperature distillation system for avoiding explosion limit, including rectifying column 11, is boiled again
Device 16, coal bed gas intake line 1, liquid nitrogen intake line 4, circulation methane pipeline, gas exhaust piping 3 and liquid methane output pipe 2.
In the present embodiment, rectifying column 11 be plate column, including tower body 12 and positioned at 12 bottom of tower body and be used to collect liquid
Tower seat cavity 15, be provided with several column plates 13 from top to bottom inside tower body 12, uppermost is first block of column plate, other column plates
It successively sorts from top to bottom, 13 end of column plate is equipped with overflow pipe 14.Be provided on tower body 12 for detect first block of column plate with
The online methane content detector 37 of No.1 of the methane content of gas-phase space between at the top of tower body is used to detect second block of column plate
The online methane content detector 38 of No. two of the methane content of gas-phase space between first block of column plate and be used for tower body bottom
The online methane content detector 35 of No. three of portion's methane content.
In the present embodiment, reboiler 16 is mounted in tower seat cavity 15；Circulation methane pipeline is across tower seat cavity 15 and again
It boils device 16 to connect, for providing heat source to reboiler 16.It is provided on tower seat cavity 15 for detecting liquid level in tower seat cavity 15
Level meter 31.One end of liquid methane output pipe 2 is connect with 15 bottom of tower seat cavity, and the other end and outside LNG are stored up
Tank connects, and Liquid level adjusting valve 51, Level meter 31 and 51 communication link of Liquid level adjusting valve are provided on liquid methane output pipe 2
It connects.
In the present embodiment, 12 middle part of tower body is led in one end of coal bed gas intake line 1, and one end of liquid nitrogen intake line 4 is logical
To 12 top of tower body, 12 top of tower body is connect with gas exhaust piping 3.No. four online methane are provided on coal bed gas intake line 1 to contain
Detector 34 is measured, is provided with No. five online methane content detectors 32, pressure detecting instrument 33 and pressure-control valve on gas exhaust piping 3
53, No.1 flow control valve 52, No. four online 34, No. five online first of methane content detector are provided on liquid nitrogen intake line 4
Alkane content detection instrument 32 is communicated to connect with No.1 flow control valve 52,53 communication link of pressure detecting instrument 33 and pressure-control valve
It connects.
In the present embodiment, circulation methane pipeline includes the circulation methane input being sent into reboiler 16 for that will recycle methane
Pipeline 5, for circulation methane output pipe 8 that methane is exported from reboiler 16 and connection circulation methane input pipe will to be recycled
The adjusting bypass 7 on road 5 and circulation methane output pipe 8, adjusts and is provided with No. two flow control valves 54 in bypass 7, recycle methane
Be provided with No. six online methane content detectors 36 on intake line 5, No. six online methane content detectors 36 and No. three it is online
Methane content detector 35 is communicated to connect with No. two flow control valves 54.
In the present embodiment, the coalbed methane containing oxygen cryogenic rectification method of explosion limit is avoided, comprising the following steps:
Step 1: liquid nitrogen sprays into 12 top of tower body by liquid nitrogen intake line 4, and as the phegma of rectifying column 11, control is existed
Coalbed methane containing oxygen under certain low-temperature condition is input into 12 middle part of tower body, coalbed methane containing oxygen gas phase portion by coal bed gas intake line 1
Divide and up flow, carries out heat and mass transport exchange with the liquid nitrogen on column plate 13 and contact, the methane in uprising gas is condensed downwards
Flowing is collected until entering in tower seat cavity 15；The on-condensible gases such as nitrogen and oxygen realize enrichment in uprising gas, continue
It flows up into gas exhaust piping 3, methane content in No. four online detection of methane content detectors 34 coalbed methane containing oxygens, No. five
Online methane content detector 32 detects methane content in gas exhaust piping 3；
Step 2: it is passed through methane into reboiler 16 by recycling methane intake line 5, as the heat source of reboiler 16, is made again
Boiling device 16 generates upward stripping；
Step 3: according to the detection numerical value tune of No. four online methane content detectors 34 and No. five online methane content detectors 32
The aperture of No.1 flow control valve 52 is saved, is protected always to control the methane content that the online methane content detector 37 of No.1 detects
It holds less than 5%, the methane content that the online methane content detector 38 of control two detects is greater than 15% or less than 5%；According to No. six
The detection numerical value of line methane content detector 36 and No. three online methane content detectors 35 adjusts No. two flow control valves 54, control
System enters the flow of the circulation methane of reboiler 16, further controls the stripping amount of 11 bottom temp of rectifying column and rising；According to
The detection numerical value of pressure detecting instrument 33 adjusts the aperture of pressure-control valve 53, to control the operating pressure of rectifying column 11；Pass through
The detection numerical value of Level meter 31 adjusts the aperture of Liquid level adjusting valve 51, thus the liquid that will be collected in tower seat cavity 15 in time
Body methane is output in external LNG storage tank.
It is any ripe although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff for knowing this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this
The protection scope of invention.
Claims (4)
1. a kind of coalbed methane containing oxygen low temperature distillation system for avoiding explosion limit, including rectifying column (11), it is characterised in that: also wrap
Include reboiler (16), coal bed gas intake line (1), liquid nitrogen intake line (4), circulation methane pipeline, gas exhaust piping (3) and liquid
Methane output pipe (2)；The rectifying column (11) be plate column, including tower body (12) and be located at the tower body (12) bottom and use
It collects the tower seat cavity (15) of liquid, is provided with from top to bottom several column plates (13) inside the tower body (12), column plate (13)
End is equipped with overflow pipe (14)；It is provided on the tower body (12) for detecting the gas between at the top of first block of column plate and tower body
The online methane content detector (37) of the No.1 of the methane content of phase space, for detect second block of column plate and first block of column plate it
Between gas-phase space methane content No. two online methane content detectors (38) and for tower body bottom methane content
No. three online methane content detectors (35)；The reboiler (16) is mounted in tower seat cavity (15)；The circulation methane pipe
Road passes through tower seat cavity (15) and connect with reboiler (16), for providing heat source to reboiler (16)；The tower seat cavity (15)
On be provided with Level meter (31) for detecting tower seat cavity (15) interior liquid level；The liquid methane output pipe (2)
One end is connect with tower seat cavity (15) bottom, and the other end is connect with external LNG storage tank, and liquid methane output pipe is arranged on (2)
Have Liquid level adjusting valve (51), the Level meter (31) and Liquid level adjusting valve (51) communicate to connect；The coal bed gas input pipe
The one end on road (1) is led in the middle part of tower body (12), and tower body (12) top, the tower are led in one end of the liquid nitrogen intake line (4)
It is connect at the top of body (12) with gas exhaust piping (3)；No. four online methane content detections are provided on the coal bed gas intake line (1)
Instrument (34) is provided with No. five online methane content detectors (32), the liquid nitrogen intake line (4) on the gas exhaust piping (3)
On be provided with No.1 flow control valve (52), No. four online methane content detectors (34), No. five online methane content detectors
(32) it is communicated to connect with No.1 flow control valve (52).
2. the coalbed methane containing oxygen low temperature distillation system according to claim 1 for avoiding explosion limit, it is characterised in that: described
Pressure detecting instrument (33) and pressure-control valve (53), pressure detecting instrument (33) and pressure control are additionally provided on gas exhaust piping (3)
Valve (53) communication connection.
3. the coalbed methane containing oxygen low temperature distillation system according to claim 1 for avoiding explosion limit, it is characterised in that: described
Circulation methane pipeline includes for will recycle the circulation methane intake line (5) in methane feeding reboiler (16), for that will follow
The circulation methane output pipe (8) and the connection circulation methane intake line (5) that ring methane is exported from reboiler (16)
Adjusting with circulation methane output pipe (8) bypasses (7), adjusts and is provided with No. two flow control valves (54) in bypass (7), recycles
No. six online methane content detectors (36), No. six online methane content detectors (36) are provided on methane intake line (5)
It is communicated to connect with No. two flow control valves (54) with No. three online methane content detectors (35).
4. it is a kind of using system described in claim 1-3 any claim to the method for coalbed methane containing oxygen cryogenic rectification,
It is characterized in that: the following steps are included:
Step 1: liquid nitrogen sprays into tower body (12) top by liquid nitrogen intake line (4), will as the phegma of rectifying column (11)
The coalbed methane containing oxygen controlled under certain low-temperature condition is input into the middle part of tower body (12) by coal bed gas intake line (1), oxygen-containing coal
Layer gas gas phase portion up flows, and carries out heat and mass transport exchange with the liquid nitrogen on column plate (13) and contacts, the first in uprising gas
Alkane is condensed to flow downward and be collected until entering in tower seat cavity (15)；The on-condensible gases such as nitrogen and oxygen in uprising gas
It realizes enrichment, continues up and flow into gas exhaust piping (3), No. four online methane content detectors (34) detect oxygen-containing coal seam
Methane content in gas, No. five online methane content detectors (32) detect methane content in gas exhaust piping (3)；
Step 2: methane is passed through into reboiler (16) by circulation methane intake line (5), the heat as reboiler (16)
Source makes reboiler (16) to generate upward stripping；
Step 3: according to the testing number of No. four online methane content detectors (34) and No. five online methane content detectors (32)
Value adjusts the aperture of No.1 flow control valve (52), so that the methane for controlling online methane content detector (37) detection of No.1 contains
Amount is always maintained at less than 5%, and the methane content of online methane content detector (38) detection of control two is greater than 15% or less than 5%；
No. two are adjusted according to the detection numerical value of No. six online methane content detectors (36) and No. three online methane content detectors (35)
Flow control valve (54), control enter the flow of the circulation methane of reboiler (16), further control rectifying column (11) bottom temperature
Degree and the stripping amount risen；According to the detection numerical value of pressure detecting instrument (33), the aperture of pressure-control valve (53) is adjusted, to control
The operating pressure of rectifying column (11) processed；By the detection numerical value of Level meter (31), the aperture of Liquid level adjusting valve (51) is adjusted,
To which the liquid methane collected in tower seat cavity (15) is output in external LNG storage tank in time.
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| CN116333771A (en) * | 2023-05-10 | 2023-06-27 | 中国矿业大学 | Device and method for improving light oil yield of oil shale |
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