CN100464820C - Gas-purifying combined absorbing tower and application thereof - Google Patents
Gas-purifying combined absorbing tower and application thereof Download PDFInfo
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- CN100464820C CN100464820C CNB2006100498008A CN200610049800A CN100464820C CN 100464820 C CN100464820 C CN 100464820C CN B2006100498008 A CNB2006100498008 A CN B2006100498008A CN 200610049800 A CN200610049800 A CN 200610049800A CN 100464820 C CN100464820 C CN 100464820C
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Abstract
The invention relates to a gas purify assembled adsorption tower and relative application. Wherein, said adsorption tower comprises: a case and a tower chamber, while the tower chamber has a tower plate at the upper part and a stuff part at the lower part. Said stuff part has a gas-liquid separation chamber, a liquid distributor, a stuff layer, a gas distributor, and a storage groove arranged from up to down, while the lower part of said gas distributor has a gas inlet; the upper part of liquid distributor has a inlet of adsorption liquid; the tower plate has at least one layer of bubble tower plate, whose upper part has a inlet of adsorption liquid; said bubble plate, gas-liquid separation chamber, liquid distributor, stuff layer, gas distributor, and storage groove are connected. The invention replaces the film-decrease tower, screen tower and washing tower with assembled tower, to simplify the device and process, and reduce the area and cost. The invention especially applies the recycle of hydrogen chloride of vinyl chloride composite gas or the gas for adsorbing the water of chlorine.
Description
(1) technical field
The present invention relates to a kind of gas-purifying combined absorbing tower and application thereof, especially for the gas-purifying combined absorbing tower of hydrogen chloride in the recovery vinyl chloride synthesis gas or the moisture in the absorption chlorine.
(2) background technology
During the chemical industry forming gas, often be accompanied by the excessive of the generation of manufacture gas or certain unstripped gas,, will have a strong impact on the quality of object gas if this class gas is not removed; Reclaiming foreign gas in addition effectively also is very important for reducing environmental pollution, controlling production cost.
Such as: in the carbide synthesizing chloroethylene technology, be to generate vinyl chloride by acetylene and hcl reaction, for improving the conversion ratio of acetylene, hydrogen chloride must be excessive, the molecular proportion of hydrogen chloride and acetylene is controlled in 1.05～1.1 scopes usually, and water, alkali cleaning method reclaim excessive hydrogen chloride, purify synthesis gas subsequently.Traditional technical process is that thick vinyl chloride is come out by converter, enter removal of mercury device and feed syngas cooler after with the active carbon adsorption mercuryvapour, after cooling, enter the falling film absorption system, the diluted acid that flows into sieve-plate tower absorbs excessive hydrogen chloride in the synthesis gas, makes 25～28% by-product hydrochloric acid.Synthesis gas after the relieving haperacidity successively enters sieve-plate tower, water scrubber and caustic wash tower and purifies, absorbs assorted gas such as remaining hydrogen chloride, carbon dioxide, use for polymerization with the vinyl chloride that obtains to make with extra care, washing, caustic wash tower will keep certain liquid circulation amount, purify needs to satisfy, fresh water is from the water scrubber continuous supplementation, waste liquid is continuous blow-down also, and small part enters the relieving haperacidity of falling film absorption system after flowing into sieve-plate tower; Alkali lye is then regularly changed, must be more after wherein concentration of sodium carbonate exceeds standard with certain density sodium hydroxide solution as absorption liquid.The weak point of this technology: a. water scrubber is continuous blow-down waste water (diluted acid) outwards, also is dissolved with vinyl chloride in the waste water, not only causes considerable loss, and contaminated environment, formation potential safety hazard, increases the pollution treatment input; B. hydrogen chloride can't loop back fully and fold into vinyl chloride, the low-concentration hcl that can only by-product be difficult to direct marketing; C. technological process is long, and equipment is many, and the sieve-plate tower operating flexibility is little, height falls in pressure, and process operation control is difficult; D. start-up has a large amount of hydrogen chloride to enter system, very easily causes process overtemperature, damage equipment; E. the discontinuous operation of caustic wash tower needs periodic replacement alkali lye, and this has certain influence to the vinyl chloride refining quality.China's polyvinyl chloride industry has develop rapidly over nearly 10 years, according to scholarly forecast, can reach 1000t/a～1100t/a to annual production in 2008, occupies first place in the world, and wherein mainly is the development carbide.Technical process also there is improvement, Han Tongan in 1998 etc. have adopted " washing bidirectional adverse current part circularly purifying technology ", improvements are to add a cooler in the water scrubber circulation, with 0 ℃ of chilled water cooling circulating water, reduce its temperature, improve the hydrogen chloride absorption rate, improve the recovery concentration of hydrochloric acid through this and reach 27%～28%, water scrubber recirculated water concentration is brought up to about 1.5%, has saved water total amount, has reduced the water scrubber discharge capacity; Thanked to refined proposition in 2000 and reclaim the concentrated hydrochloric acid new technology with sieve-plate tower, but the hydrochloric acid of by-product higher concentration, its way also is to adopt the sieve-plate tower absorbing hydrogen chloride that has intercooler, absorption portion does not directly enter the caustic wash tower processing.This method has been cancelled water scrubber, has realized zero-emission outwardly, is to sponge at caustic wash tower but considerable part hydrogen chloride is arranged, and must strengthen alkali charge and spent lye discharge capacity; The technical reform scheme of Chen Zhong ripple in 2002 and roughly the same last it is said that synthesis gas contains the chlorination hydrogen concentration behind water scrubber and drops to 0.002%, by-product acid concentration only 24%～28%.
The purification of other synthesis gas also exists similar problem, and how absorbing foreign gas effectively and recycling is the ubiquitous difficult problem of chemical industry.
(3) summary of the invention
The object of the invention is to provide a kind of easy and simple to handle, waste gas rate of recovery height, realizes the gas-purifying combined absorbing tower of zero-emission substantially, is particularly useful for reclaiming the hydrogen chloride in the vinyl chloride synthesis gas or absorbs moisture in the chlorine.
Gas-purifying combined absorbing tower of the present invention comprises tower shell, and the tower chamber comprises superposed column plate section and the packing section that is positioned at the bottom in the described tower chamber,
Described packing section is provided with gas-liquid separation chamber, liquid distribution trough, packing layer, gas distributor, storagetank from top to bottom successively, and described gas distributor bottom is provided with the gas access, and described liquid distribution trough top is provided with the absorption liquid inlet;
Described column plate section is provided with one deck bubble cap plate at least, and bubble cap plate top is provided with the absorption liquid inlet; Described bubble cap plate, gas-liquid separation chamber, liquid distribution trough, packing layer, gas distributor, storagetank are connected.
Described gas distributor can adopt and well known to a person skilled in the art distributor, generally can obtain from the commercial channel.Simultaneously, the inventor also designed a kind of simple in structure, do not account for the useful space in the tower, no pressure drop, distributor that distribution of gas efficient is high, described structure of distributor is as follows: the baffle plate that gas distributor is fixed on the barrier support by being arranged in parallel constitutes, usually select for use by 10～15 baffle plates and constitute, leave spacing between the described baffle plate, recommend to leave not equidistant spacing between the baffle plate, its spacing increases along air current flow direction block-by-block; Described barrier support is fixedlyed connected with the tower cavity wall, the plane that described baffle plate longitudinal centre line is constituted becomes 9～15 ° of inclination angles with horizontal plane, described baffle plate is circular-arc, described circular arc opening is towards the higher side of barrier support and tower cavity wall junction, the level inclination of described baffle plate lateral cross section circular arc string is 45～75 °, and described gas access is located at the relative side of baffle plate circular arc opening and is positioned on the tower cavity wall of described barrier support below.The air-flow that gas distributor of the present invention has improved section at the bottom of the packing layer distributes, and has improved absorptivity, and air inlet section air-flow becomes in order from disorder and flows, and has also reduced flow pressure drop.
Further, described barrier support by two on same plane and become the horn-like stripe board that is fixed on the tower cavity wall to constitute from top to bottom, the angle of described two stripe board is 10～30 °.
Further again, described gas access be positioned at barrier support and tower cavity wall junction under, described two stripe board at the diameter of the air line distance of tower cavity wall gas access end and gas access about equally.Here to be two stripe board be slightly larger than or equal the diameter of gas access in the air line distance of tower cavity wall gas access end to connotation about equally, can make the operating efficiency of gas distributor higher like this.
Described liquid distribution trough can adopt and well known to a person skilled in the art distributor, generally can obtain from the commercial channel.Simultaneously, the inventor has also designed the high distributor of a kind of liquid distribution efficient, and described structure of distributor is as follows: liquid distribution trough comprises liquid distributing trough and several liquid distributing grooves, recommends to be provided with 1～2 liquid distributing trough; Distributing trough places the distributing slot top, selects distributing trough to put with distributing slot usually and is in quadrature arrangement, and described liquid distributing trough is provided with the liquid outlet with the liquid distributing groove conducting, and described liquid distributing groove cell wall is provided with liquid flowing outlet; Have curb on the groove outer wall of described liquid flowing outlet below, described liquid distributing groove outer wall is provided with the flow-stopping plate that cooperates with liquid flowing outlet.
Further, described liquid distributing groove cell body both sides are evenly distributed with some liquid flowing outlets respectively, are respectively equipped with flow-stopping plate on the outer wall of described liquid distributing groove both sides.
Liquid distribution trough of the present invention has guaranteed that liquid spraying density is at 10m
3/ m
2H～50m
3/ m
2Can obtain stable liquid initial in the h scope evenly distributes.
Preferably, described column plate section is provided with bar shaped bubble cap plate and circular bubble cap tray from top to down, and the top of described bar shaped bubble cap plate and circular bubble cap tray is respectively equipped with the absorption liquid inlet.Described bar shaped bubble cap plate and circular bubble cap tray are conventionally known to one of skill in the art.The inventor has also designed a kind of bar shaped bubble cap plate of special construction, make absorption efficiency higher, its technical scheme that adopts is: the length-width ratio of bar shaped bubble-cap is 10～80:1 in the bar shaped bubble cap plate, and the bar shaped bubble-cap is parallel arrangement radially, leaves the gap between every row's bar shaped bubble-cap; A row is one whole bar shaped bubble-cap in every two adjacent row's bubble-caps, all leaves the gap between described whole bar shaped bubble-cap two ends and inner wall of tower, and this gap constitutes fluid passage; Two bar shaped bubble-caps that another row arranges for same column constitute, the adjacent end of described two bar shaped bubble-caps leaves the gap that constitutes fluid passage, the other end all and between the tower cavity wall seals by liquid barrier, and the gap between described bar shaped bubble-cap is interconnected, and constitutes fluid passage.After adopting bar shaped bubble cap plate of the present invention, gas flow paths is identical with common bubble cap plate, promptly passes liquid layer from lower floor's column plate behind riser, bubble-cap and flows out; Flow path is more special, from the outlet outflow of inlet weir, and circuitous flowing around every bubble-cap after the outlet on the exit weir flows out, its flow process is very long, flow velocity is little, so the time of staying of enough length is arranged onboard, only can absorb foreign gas in the air-flow with small amount of liquid.
Further again, described column plate pars infrasegmentalis is provided with several layers of circular bubble cap tray, is typically provided with 1～3 layer, and top is provided with several layers of bar shaped bubble cap plate, generally is provided with 1～3 layer.
Gas-purifying combined absorbing tower of the present invention is applicable to the foreign gas in absorption and the recycling mist.Be specially adapted to reclaim the hydrogen chloride in the vinyl chloride synthesis gas, can certainly be applicable to other occasion, as absorbing the moisture in the chlorine, the carbon dioxide in the vinyl chloride etc.
When absorption tower of the present invention is used for reclaiming the hydrogen chloride of vinyl chloride synthesis gas, compared with prior art have following beneficial effect:
A. replaced former falling-film tower, sieve-plate tower and water scrubber with combined column, simplified equipment and flow process, reduced floor space and reduced equipment investment.
B. process need not to add excessive water, has realized zero-emission.Not only hydrogen chloride reclaims entirely, and does not have vinyl chloride to run off, and all is better than former process from environmental protection, economy, security standpoint.
But c. the finished product hydrochloric acid of production high concentration or recycling hydrogen chloride have been realized the recycling economy of this process.
D. the control of process and operation are convenient than original system, and especially start-up enters system because of a large amount of hydrogen chloride are arranged, and very easily causes process overtemperature, damage equipment, use the combined column technology can avoid fully.
E. realize the continued operation of caustic wash tower, improved the vinyl chloride refining quality.
When absorption tower of the present invention is used to reclaim other gas, can obtain beneficial effect same as described above or similar equally.
(4) description of drawings
Fig. 1 is the structural representation of described combined absorbing tower.
Fig. 2 is the scheme of installation of described gas distributor.
Fig. 3 is the side view of described gas distributor.
Fig. 4 is the structural representation of described liquid distribution trough flow passage unit.
Fig. 5 is the structural representation of described bar shaped bubble cap plate.
(5) specific embodiment
The invention will be further described below in conjunction with embodiment, but protection scope of the present invention is not limited to this.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, a kind of gas-purifying combined absorbing tower, comprise tower shell 1, the tower chamber, comprise superposed column plate section and the packing section that is positioned at the bottom in the tower chamber, packing section is provided with gas-liquid separation chamber 2, liquid distribution trough 3, packing layer 4, gas distributor 5, storagetank 6 from top to bottom successively, and the gas distributor bottom is provided with gas access 7, and liquid distribution trough top is provided with absorption liquid inlet 8.
The baffle plate 14 that gas distributor 5 is fixed on by being arranged in parallel on the barrier support 13 constitutes, leave not equidistant spacing between the baffle plate 14, its spacing increases along air current flow direction block-by-block, barrier support 13 is fixedlyed connected with the tower cavity wall, the plane that the baffle plate longitudinal centre line is constituted becomes 12 ° of inclination angles with horizontal plane, baffle plate 14 is circular-arc, and the circular arc opening is towards the higher side of barrier support and tower cavity wall junction, and the level inclination of baffle plate lateral cross section circular arc string is 60 °.Barrier support 13 by two on same plane and become the horn-like straight-bar that is fixed on the tower cavity wall to constitute from top to bottom, the angle of two stripe board is 20 °.Gas access 7 is positioned under barrier support 13 and the tower cavity wall junction, two stripe board in the air line distance of tower cavity wall gas access end and the equal diameters of gas access.
Liquid distribution trough 3 comprises 1 liquid distributing trough and several liquid distributing grooves 15, distributing trough places the distributing slot top, distributing trough is put with distributing slot and is in quadrature arrangement, the liquid distributing trough is provided with the liquid outlet with liquid distributing groove 15 conductings, and liquid distributing groove cell body 15 both sides are evenly distributed with some liquid flowing outlets 16 respectively; Have curb 17 on the groove outer wall of liquid flowing outlet 16 belows, be respectively equipped with flow-stopping plate 18 on the liquid distributing groove 15 both sides outer walls.
The column plate section is provided with 2 layers of bar shaped bubble cap plate 10 and 3 layers of circular bubble cap tray 9 from top to down, and the top of bar shaped bubble cap plate and circular bubble cap tray is respectively equipped with absorption liquid inlet 12,11.The length-width ratio of bar shaped bubble-cap 19 is 50:1 in the bar shaped bubble cap plate 10, and bar shaped bubble-cap 19 is parallel arrangement radially, leaves the gap between every row's bar shaped bubble-cap; A row is one whole bar shaped bubble-cap in every two adjacent row's bubble-caps, leaves the gap between whole bar shaped bubble-cap two ends and inner wall of tower, and this gap constitutes fluid passage; Two bar shaped bubble-caps that another row arranges for same column constitute, and the adjacent end of described two bar shaped bubble-caps leaves the gap that constitutes fluid passage, and the other end all and between inner wall of tower seals by liquid barrier 20, the formation fluid passage that is interconnected of the gap between the bar shaped bubble-cap.
Bar shaped bubble cap plate 10, circular bubble cap tray 9, gas-liquid separation chamber 2, liquid distribution trough 3, packing layer 4, gas distributor 5, storagetank 6 are communicated with successively.
When the combinations thereof absorption tower is used for reclaiming hydrogen chloride in the vinyl chloride synthesis gas, contain HCl 4～10% in the vinyl chloride synthesis gas, other gas trace, synthesis gas feeds the absorption tower by gas access 7, absorption liquid inlet 8 adds 30～35% concentrated hydrochloric acid, absorption liquid inlet 11 adds 10～22% watery hydrochloric acid, and absorption liquid inlet 12 adds clear water.Air inlet enters packing layer 4 and the liquid contact mass transfer that descends through liquid distribution trough 3 after gas distributor 5 distributes.The air-flow that rises is entrained with a little liquid end, obtains separating in flow separation space 2.Air-flow enters circular bubble cap tray 9, bar shaped bubble cap plate 10 and the absorption liquid contact mass transfer that descends again successively.Cat head obtains pure vinyl chloride, and the hydrogen chloride absorption rate is near 100%.Storagetank at the bottom of the tower obtains 30～35% by-product hydrochloric acid, can circulate as absorption liquid or directly uses as technical hydrochloric acid.
Claims (9)
1, a kind of gas-purifying combined absorbing tower comprises tower shell, and the tower chamber is characterized in that: comprise superposed column plate section and the packing section that is positioned at the bottom in the described tower chamber,
Described packing section is provided with gas-liquid separation chamber, liquid distribution trough, packing layer, gas distributor, storagetank from top to bottom successively, and described gas distributor bottom is provided with the gas access, and described liquid distribution trough top is provided with the absorption liquid inlet;
Described column plate section is provided with one deck bubble cap plate at least, and bubble cap plate top is provided with the absorption liquid inlet; Described bubble cap plate, gas-liquid separation chamber, liquid distribution trough, packing layer, gas distributor, storagetank are connected;
The baffle plate that described gas distributor is fixed on the barrier support by being arranged in parallel constitutes, leave spacing between the described baffle plate, described barrier support is fixedlyed connected with the tower cavity wall, the plane that described baffle plate longitudinal centre line is constituted becomes 9～15 ° of inclination angles with horizontal plane, described baffle plate is circular-arc, described circular arc opening is towards the higher side of barrier support and tower cavity wall junction, the level inclination of described baffle plate lateral cross section circular arc string is 45～75 °, and described gas access is located at the relative side of baffle plate circular arc opening and is positioned on the tower cavity wall of described barrier support below.
2, gas-purifying combined absorbing tower as claimed in claim 1 is characterized in that: described barrier support by two on same plane and become the horn-like stripe board that is fixed on the tower cavity wall to constitute from top to bottom, the angle of two stripe board is 10～30 °.
3, gas-purifying combined absorbing tower as claimed in claim 2, it is characterized in that: described gas access be positioned at barrier support and tower cavity wall junction under, described two stripe board at the diameter of the spacing of tower cavity wall gas access end and gas access about equally.
4, gas-purifying combined absorbing tower as claimed in claim 1, it is characterized in that: described liquid distribution trough comprises liquid distributing trough and several liquid distributing grooves, described liquid distributing trough places the top of liquid distributing groove, described liquid distributing trough is provided with the liquid outlet with the liquid distributing groove conducting, and described liquid distributing groove cell wall is provided with liquid flowing outlet; Have curb on the groove outer wall of described liquid flowing outlet below, described liquid distributing groove outer wall is provided with the flow-stopping plate that cooperates with liquid flowing outlet.
5, gas-purifying combined absorbing tower as claimed in claim 4 is characterized in that: described liquid distributing groove cell body both sides are evenly distributed with some liquid flowing outlets respectively, are respectively equipped with flow-stopping plate on the outer wall of described liquid distributing groove both sides.
6, as the described gas-purifying combined absorbing tower of one of claim 1～5, it is characterized in that: described column plate section is provided with bar shaped bubble cap plate and circular bubble cap tray from top to down, and the top of described bar shaped bubble cap plate and circular bubble cap tray is respectively equipped with the absorption liquid inlet.
7, gas-purifying combined absorbing tower as claimed in claim 6 is characterized in that: the length-width ratio of bar shaped bubble-cap is 10～80:1 in the described bar shaped bubble cap plate, and the bar shaped bubble-cap is parallel arrangement radially, leaves the gap between every row's bar shaped bubble-cap; In every two adjacent row's bar shaped bubble-caps a row being arranged is one whole bar shaped bubble-cap, and described whole bar shaped bubble-cap two ends and tower cavity wall all leave the gap, and described gap constitutes fluid passage; Two bar shaped bubble-caps that another row arranges for same column constitute, and the adjacent end of described two bar shaped bubble-caps leaves the gap that constitutes fluid passage, and the other end all is connected by the liquid barrier sealing with the tower cavity wall.
8, gas-purifying combined absorbing tower as claimed in claim 6 is characterized in that: described column plate pars infrasegmentalis is provided with 1～3 layer of circular bubble cap tray, and top is provided with 1～3 layer of bar shaped bubble cap plate.
9, the purposes of the described gas-purifying combined absorbing tower of claim 1 is characterized in that described purposes is to be used for reclaiming the hydrogen chloride of vinyl chloride synthesis gas or the moisture in the absorption chlorine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100498008A CN100464820C (en) | 2006-03-13 | 2006-03-13 | Gas-purifying combined absorbing tower and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100498008A CN100464820C (en) | 2006-03-13 | 2006-03-13 | Gas-purifying combined absorbing tower and application thereof |
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| CN1843569A CN1843569A (en) | 2006-10-11 |
| CN100464820C true CN100464820C (en) | 2009-03-04 |
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| CNB2006100498008A Active CN100464820C (en) | 2006-03-13 | 2006-03-13 | Gas-purifying combined absorbing tower and application thereof |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hangzhou Zhonghao Tech Co., Ltd. Assignor: Dong Yiren Contract fulfillment period: 2009.6.4 to 2016.3.13 contract change Contract record no.: 2009330001435 Denomination of invention: Gas-purifying combined absorbing tower and application thereof Granted publication date: 20090304 License type: Exclusive license Record date: 2009.6.17 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.6.4 TO 2016.3.13; CHANGE OF CONTRACT Name of requester: HANGZHOU ZHONGHAO SCIENCE AND TECHNOLOGY CO., LTD. Effective date: 20090617 |
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Effective date of registration: 20180214 Address after: 311112 Hongda Road, Canal Street, Yuhang District, Hangzhou, Zhejiang Province, No. 22 Patentee after: Hangzhou Zhonghao Tech Co., Ltd. Address before: Hangzhou City, Zhejiang province 310014 City Zhaohui modern Nga Court 21 Unit Three Building Room 601 Patentee before: Dong Yiren |
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