CN109289443A - A kind of filling tail gas recycling and treating device of methanol - Google Patents
A kind of filling tail gas recycling and treating device of methanol Download PDFInfo
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- CN109289443A CN109289443A CN201811470107.7A CN201811470107A CN109289443A CN 109289443 A CN109289443 A CN 109289443A CN 201811470107 A CN201811470107 A CN 201811470107A CN 109289443 A CN109289443 A CN 109289443A
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- methanol
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- wash column
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- methanol wash
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
A kind of filling tail gas recycling and treating device of methanol, including methanol feed channel and carbon dioxide gas, the tower bottom of Methanol Wash Column I is connected to after two pipeline mixing, it send after the water circulating pump boosting that liquid phase inside Methanol Wash Column I passes through I tower to tower top and recycles, it is provided between the filler that desalted water and methanol come into full contact in I tower of Methanol Wash Column, and it is provided with wire mesh demister, to reduce liquid phase loss.Gas phase inside Methanol Wash Column I goes out to carry out washing absorption with desalted water again into II tower bottom of Methanol Wash Column from tower top, I tower of Methanol Wash Column is also interior to be provided between the filler that desalted water and methanol come into full contact with, and it is provided with wire mesh demister, to reduce liquid phase loss.The liquid phase of the Methanol Wash Column II is pumped to tower top by recirculated water and is recycled, gas phase from tower top pipe go out by air-introduced machine be sent into exhaust chimney after qualified discharge.The present invention improves use ratio of methanol, reduces methanol waste, it is therefore prevented that environmental pollution.
Description
Technical field
The present invention relates to the filling tail gas recycle technical field of methanol, in particular to a kind of filling tail gas recycle processing dress of methanol
It sets.
Background technique
Currently, most domestic ammonia from coal enterprise generation methanol-fueled exhaust all not filling to methanol recycles, but draw
Lofty perch emptying, not only causes methanol to waste, but also cause atmosphere pollution in this way.The methanol-fueled exhaust of the filling generation of methanol, which belongs to, to be waved
Hair property organic matter, according to the related request that country administers volatile organic compounds recovery, the national filling tail of iterative method methanol
Gas is recycled work, and the tail gas discharged after recovery processing is monitored on-line, and exhaust emissions index is not reached
Target enterprise will be punished, accountability.The filling tail gas recycle processing of a kind of methanol efficiently, stable, mature in such a case
The birth of device just seems abnormal important.
Summary of the invention
In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide at a kind of filling tail gas recycle of methanol
Device is managed, the methanol-fueled exhaust of the filling generation of methanol is collected by absorbing trunk mainly and washes workshop section's dioxy with from low-temp methanol
Methanol-fueled exhaust water scrubber I, the progress water absorption of water scrubber II are sent by air-introduced machine after change carbon tail gas mixed diluting, in water scrubber
Interior methanol-fueled exhaust and desalted water carry out Physical Absorption, and the methanol solution after absorption is sent to purification low-temp methanol workshop section washing tail-gas scrubbing tower
It recycles.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of filling tail gas recycling and treating device of methanol, including methanol feed channel and carbon dioxide gas, described two
The tower bottom of Methanol Wash Column I 1 is connected to after pipeline mixing, the liquid phase inside the Methanol Wash Column I 1 passes through the circulation of I tower
Water pump 17 send to tower top after boosting and recycles, and the filler that desalted water and methanol come into full contact with is provided in I 1 tower of Methanol Wash Column
Between, and it is provided with wire mesh demister, to reduce liquid phase loss.Gas phase inside Methanol Wash Column I 1 goes out to enter methanol from tower top
II 2 tower bottom of scrubbing tower carries out washing absorption with desalted water again, I 2 tower of Methanol Wash Column also in be provided with desalted water and filled with methanol
Between the filler for tapping touching, and it is provided with wire mesh demister, to reduce liquid phase loss.The liquid phase of the Methanol Wash Column II 2 is logical
It crosses water circulating pump 4 and send to tower top and be recycled, gas phase is gone out after air-introduced machine 5 is sent into exhaust chimney 3 from tower top pipe
Qualified discharge.
The recirculated water of I tower is respectively arranged with extremely on the circulating line of the Methanol Wash Column I 1 and Methanol Wash Column II 2
Header tank sends valve 19 outside and II tower recirculated water to header tank sends valve 23 outside, sends 19 He of valve outside by recirculated water to the header tank of I tower
II tower recirculated water to header tank is sent valve 23 outside and is connected on header tank 6.
I tower desalted water water compensating valve 20 and II tower desalted water water compensating valve 24 are connected with by pipeline on the circulating line, I
Tower desalted water water compensating valve 20 and II tower desalted water water compensating valve 24 are respectively that Methanol Wash Column I 1 and Methanol Wash Column II 2 are mended
Water is provided with desalination water inlet valve 12 on the circulating line total pipeline.
It is provided with waste liquid on the header tank 6 and sends pump 7 and subsidiary pipeline outside, valve 15 is sent outside by dense methanol-water and is sent to net
Tail gas washing tower recycling is set in makeup.
Header tank exhaust valve 25 is provided at the top of the header tank 6, bottom is provided with header tank bottom blow-down valve 8.
Flowmeter is provided on two mixed supervisors of pipeline.
The methanol feed channel mixed with two pipelines of carbon dioxide gas after in total pipeline, total pipeline be provided with into
Mouth main valve 11.
It is divided into two tunnels after the total pipeline import main valve 11, a-road-through piping is directly entered I 1 bottom of Methanol Wash Column
Portion, another way is by I 1 bypass valve of Methanol Wash Column, this two-way converges after I 1 top outlet valve 14 of Methanol Wash Column, after bout
Bis- tunnel Zai Fen, all the way by entering II 2 bottom of Methanol Wash Column after II 2 inlet valve 21 of Methanol Wash Column；Another way passes through methanol
II 2 bypass valve 16 of scrubbing tower accesses it after the outlet valve 14 of Methanol Wash Column II 2 and converges.Methanol Wash Column I 1 and methanol washing
The purpose that tower II 2 is provided with bypass valve is can to adjust Methanol Wash Column I 1 and Methanol Wash Column II 2 according to device tolerance size
It is series, parallel, is also single use.
Carbon dioxide inlet valve 9 is provided on the carbon dioxide gas inlet pipeline.
The water circulating pump of I tower is respectively arranged on the circulating line of the Methanol Wash Column I 1 and Methanol Wash Column II 2
Outlet valve 18 and II tower water circulating pump outlet valve 22.
The inlet gas, tails assay cabin 10 are set near device, sample point be located at gaseous mixture general pipeline and
On tail gas funnel.
The control and regulation of affiliated device can use PLC panel and control or be passed to data on the DCS of big system
It is controlled.
Beneficial effects of the present invention:
1, the methanol gas generated in methanol pouring process methanol dope after absorptive unit absorption processing is sent to purification device
Tail gas washing tower recycles, and improves use ratio of methanol, reduces methanol waste, it is therefore prevented that environmental pollution.
2, in order to guarantee equipment safety, the methanol-fueled exhaust of the canned generation of methanol and air is avoided to form explosive gas,
The present apparatus uses the injection carbon dioxide gas into methanol tail gas collection general pipeline be diluted, be datonation-inhibition, with carbon dioxide gas
The upper explosion limit of the promotion of concentration, methanol gas sharply declines, and upper explosion limit slowly rises, when carbon dioxide reaches 35% (body
Fraction) methanol gas upper explosion limit and lower explosion limit meet at a bit, methanol gas exits explosion gas, becomes safe gas.For
Guarantee equipment safety, the concentration index of carbon dioxide gas is determined as >=40% (volume fraction) by the present apparatus.Dilution
The purification low-temp methanol that carbon dioxide comes washes workshop section's hydrogen sulphide concentration tower emission.
The present apparatus can also use nitrogen as dilution, datonation-inhibition gas, with the promotion of nitrogen gas concentration, methanol gas it is quick-fried
The fried upper limit sharply declines, and upper explosion limit slowly rises, when carbon dioxide reaches the upper explosion limit of 45% (volume fraction) methanol gas
It is met at a bit with lower explosion limit, methanol gas exits explosion gas, becomes safe gas.
3, the emission after absorbing can reach its discharge standard≤50PPm.
4, to guarantee that the filling methanol-fueled exhaust of methanol can be recycled all, the present apparatus is controlled by frequency converting induced draft fan to be absorbed
General pipeline terminal pressure is -50Pa, and the pressure and frequency converting induced draft fan serials control guarantee absorbing trunk negative regulation, realizes automatic control
System improves manipulation convenience and timeliness.
5, present apparatus electrical equipment, facility are all made of anti-explosion, and use TN--S protective device.It is poly- to avoid electrostatic
Collect initiation accident, device is bridged using antistatic and capital equipment is connected in grounded screen.For anti-lightning strike accident, in device highest point
Equipment lightning rod.
6, it to guarantee that tail gas methanol in-line analyzer is arranged in equipment safety operation and tail gas qualified discharge, device, absorbs total
Pipe oxygen, carbon dioxide, methanol analytical table provide data for device adjusting and support in order to timely control device operating condition.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
1 is Methanol Wash Column I；2 be Methanol Wash Column II；3 be blowdown stack；4 be the water circulating pump of I tower, and 17 be II tower
Water circulating pump；5 be air-introduced machine；6 be header tank；7 be dense methanol water pump；8 be header tank bottom blow-down valve；9 be carbon dioxide
Inlet valve；10 be inlet gas, tails assay cabin；11 be combi inlet port valve；12 be desalination water inlet valve；13 wash for methanol
The bypass valve of tower II, 16 be the bypass valve of Methanol Wash Column I, and 14 be I outlet valve of Methanol Wash Column, and 21 be Methanol Wash Column II
Inlet valve.15 send valve outside for dense methanol-water；18 be the outlet valve of the water circulating pump of I tower, and 22 be the outlet of the water circulating pump of II tower
Valve；19 send valve outside for recirculated water to the header tank of I tower, and 23 send valve outside for II tower recirculated water to header tank；20 mend for I tower desalted water
Water valve, 24 be II tower desalted water water compensating valve；25 be the exhaust valve of header tank 6.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
According to the principle that methanol and water can be dissolved each other with arbitrary proportion, the methanol steam that methanol is generated when filling is in scrubbing tower
The shower water that interior and tower top gets off carries out counter current contacting absorption between filler.Methanol is dissolved in water and enters outlet after liquid phase systems circulation
To purification section, gas phase not soluble in water is entered after chimney by tower top discharges on the spot.
Since the gas of recycling is the mixed gas of methanol and air, to ensure to make safely methanol concentration in gaseous mixture not exist
Within the scope of explosion limit, draw partial CO 2 gas to recycling general pipeline from purification section, mixed gas with methanol and air
Enter carrying out washing treatment tower after mixing again.
13,14,21,16 valves are provided on the pipeline, with guarantee Methanol Wash Column I 1 and Methanol Wash Column II 2 it
Between series and parallel control.
The working principle of the invention:
The methanol gas that methanol pouring process generates as shown in Figure 1: is under the action of blower, the dioxy that comes with purification section
It is washed by inlet valve 11 from methanol after changing carbon gas (flowmeter can be installed additional, on supervisor convenient for flow operation control) mixing
I 1 bottom of tower enters in tower, and the desalted water to get off with tower top carries out counter current contacting between filler and absorbs methanol steam.Liquid phase passes through I
The water circulating pump 17 of tower send to tower top after boosting and recycles；Gas phase from tower top go out to enter Methanol Wash Column II 2 again with it is de-
Salt water carries out washing absorption, and liquid phase is pumped to tower top by the recirculated water of I tower in tower reactor and is recycled.Gas phase is gone out from tower
The qualified discharge after air-introduced machine 5 is sent into chimney 3.
It is excessively high when recycling washing water methanol concentration in Methanol Wash Column I 1 and Methanol Wash Column II 2, it influences to methanol gas
When assimilation effect, recirculated water to the header tank for opening Methanol Wash Column I 1 and II 2 tower of Methanol Wash Column, I tower sends valve 19, tower II outside
Tower recirculated water to header tank sends valve 23 outside and is sent to header tank 6, opens simultaneously Methanol Wash Column I 1 and Methanol Wash Column II 2
I tower desalted water water compensating valve and II moisturizing into Methanol Wash Column I 1 and Methanol Wash Column II 2 of tower desalted water water compensating valve 24 guarantee tower
Washing absorption effect and liquid level it is normal.When 6 liquid level of header tank reaches discharge value, starts dense methanol water pump 7 and send outside to purification
Workshop section.
According to the actual conditions of methanol entrucking, when the loading of freight waggon is big, the methanol of generation is large-minded, can close methanol washing
The bypass valve 13 of the Methanol Wash Column II of tower II 2, the bypass valve 16 of the Methanol Wash Column I of Methanol Wash Column I 1 make Methanol Wash Column
I 1 and Methanol Wash Column II 2 be used in series, to guarantee assimilation effect, make be vented qualified discharge；When the loading of freight waggon is small, the first of generation
Alcohol is narrow-minded, can close bypass valve 13, I 1 Methanol Wash Column of Methanol Wash Column of the Methanol Wash Column II of Methanol Wash Column II 2
I outlet valve 14 cuts out Methanol Wash Column I 1, and the methanol for making Methanol Wash Column II 2 independently use or close Methanol Wash Column I 1 is washed
The inlet valve 21 of the bypass valve 16, Methanol Wash Column II 2 of washing tower I cuts out Methanol Wash Column II 2, keeps Methanol Wash Column I 1 independent
It uses, reaches energy-saving purpose.
To guarantee that the filling methanol-fueled exhaust of methanol can be recycled all, the present apparatus passes through 5 rotational speed regulation of frequency converting induced draft fan
It is -50~-100Pa to control absorbing trunk terminal pressure, the pressure and frequency converting induced draft fan serials control guarantee that absorbing trunk is negative
Pressure is stablized, and realizes and automatically controls, and improves manipulation convenience and timeliness.
To prevent under microthermal climate circulation washing water freezing, bursting by freezing pipeline and equipment, influence device operation, the present apparatus for
Waterpipe uses steam tracing or electric tracing.
Claims (10)
1. a kind of filling tail gas recycling and treating device of methanol, which is characterized in that including methanol feed channel and carbon dioxide gas, institute
The tower bottom of Methanol Wash Column I (1) is connected to after the two pipelines mixing stated, the internal liquid phase of the Methanol Wash Column I (1) is logical
It send to tower top and recycles after crossing water circulating pump (17) boosting of I tower, Methanol Wash Column I (1) tower top is provided with desalted water and is filling out
Between material, the internal gas phase of Methanol Wash Column I (1) goes out to be washed with desalted water again into Methanol Wash Column II (2) from tower top
Absorption is washed, the liquid phase of the Methanol Wash Column II (2), which is sent by the water circulating pump (4) of II tower to tower top, to be recycled,
Gas phase from tower top pipe go out by air-introduced machine (5) be sent into exhaust chimney (3) after qualified discharge.
2. the filling tail gas recycling and treating device of a kind of methanol according to claim 1, which is characterized in that the methanol is washed
It washs and is respectively arranged with recirculated water to the header tank of I tower on the circulating line of tower I (1) and Methanol Wash Column II (2) and sends valve (19) outside
Valve (23) are sent outside with II tower recirculated water to header tank, and valve (19) and II tower recirculated water are sent outside by recirculated water to the header tank of I tower
Valve (23) is sent outside to header tank to be connected on header tank (6).
3. the filling tail gas recycling and treating device of a kind of methanol according to claim 2, which is characterized in that the circulation pipe
I tower desalted water water compensating valve (20) and II tower desalted water water compensating valve (24), I tower desalted water water compensating valve are connected with by pipeline on road
(20) and II tower desalted water water compensating valve (24) is respectively that Methanol Wash Column I (1) and Methanol Wash Column II (2) carry out moisturizing, described
Circulating line total pipeline on be provided with desalination water inlet valve (12).
Be provided with waste liquid on header tank (6) described in 4. and send pump 7 and subsidiary pipeline outside, by dense methanol-water send outside valve (15) send to
Purification device tail gas washing tower recycles.Header tank exhaust valve (25) are provided at the top of header tank (6), bottom is provided with header tank
Bottom blow-down valve 8.
5. the filling tail gas recycling and treating device of a kind of methanol according to claim 2, which is characterized in that the header tank
(6) top is provided with header tank exhaust valve (25), and bottom is provided with header tank bottom blow-down valve (8).
6. the filling tail gas recycling and treating device of a kind of methanol according to claim 1, which is characterized in that two pipes
Flowmeter is provided on the mixed supervisor in road.
7. the filling tail gas recycling and treating device of a kind of methanol according to claim 1, which is characterized in that two pipes
Methanol Wash Column I (1) connecting place is provided with inlet valve (11) after road mixing.
8. the filling tail gas recycling and treating device of a kind of methanol according to claim 1, which is characterized in that the methanol is washed
It washs tower I (1) to be connected on Methanol Wash Column II (2) by total pipeline, the output end of Methanol Wash Column I (1) passes through total pipeline point
It for two-way, connects on the downside of Methanol Wash Column II (2) all the way, all the way connection gas phase tower top outlet pipeline, in the lower side conduit
It is provided with the inlet valve (21) of Methanol Wash Column II, the bypass valve of Methanol Wash Column II is provided on gas phase tower top outlet pipeline
(13), it is provided with I outlet valve of Methanol Wash Column (14) on total pipeline, two of the methanol feed channel and carbon dioxide gas
Separately draw pipeline all the way after pipeline mixing to be connected with total pipeline, the bypass valve (16) of Methanol Wash Column I is provided on pipeline.
9. the filling tail gas recycling and treating device of a kind of methanol according to claim 1, which is characterized in that the titanium dioxide
Carbon dioxide inlet valve (9) are provided on carbon gas inlet duct.
10. the filling tail gas recycling and treating device of a kind of methanol according to claim 1, which is characterized in that the methanol
Be respectively arranged on the circulating line of scrubbing tower I (1) and Methanol Wash Column II (2) outlet valve (18) of the water circulating pump of I tower with
The outlet valve (22) of the water circulating pump of II tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470107.7A CN109289443A (en) | 2018-11-28 | 2018-11-28 | A kind of filling tail gas recycling and treating device of methanol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470107.7A CN109289443A (en) | 2018-11-28 | 2018-11-28 | A kind of filling tail gas recycling and treating device of methanol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109289443A true CN109289443A (en) | 2019-02-01 |
Family
ID=65141434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811470107.7A Pending CN109289443A (en) | 2018-11-28 | 2018-11-28 | A kind of filling tail gas recycling and treating device of methanol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109289443A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111346480A (en) * | 2020-03-20 | 2020-06-30 | 陕西陕焦化工有限公司 | Treatment device and treatment method for methanol waste gas |
| CN115501736A (en) * | 2022-09-06 | 2022-12-23 | 灵谷化工集团有限公司 | CO for improving methanol recovery effect 2 Tail gas washing tower |
-
2018
- 2018-11-28 CN CN201811470107.7A patent/CN109289443A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111346480A (en) * | 2020-03-20 | 2020-06-30 | 陕西陕焦化工有限公司 | Treatment device and treatment method for methanol waste gas |
| CN115501736A (en) * | 2022-09-06 | 2022-12-23 | 灵谷化工集团有限公司 | CO for improving methanol recovery effect 2 Tail gas washing tower |
| CN115501736B (en) * | 2022-09-06 | 2023-10-17 | 灵谷化工集团有限公司 | CO for improving methanol recovery effect 2 Tail gas washing tower |
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