CN2760031Y

CN2760031Y - Composite type methanol evaporator

Info

Publication number: CN2760031Y
Application number: CN 200420120709
Authority: CN
Inventors: 田宝峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-22
Filing date: 2004-12-22
Publication date: 2006-02-22
Anticipated expiration: 2014-12-22

Abstract

The utility model relates to a composite methanol evaporator for formaldehyde production, which is composed of an evaporation section, a superheat filter section, an upper cover and a residual liquid concentrator. Due to the adoption of a connected structure of the evaporation section, the superheat filter section, the upper cover and the residual liquid concentrator, the utility model relieves frequent liquid drainage operations for a superheater and a filter in a traditional method and also relieves injury on a catalyst of belt liquid. When methanol temperature achieves an index, an air inlet is switched over, binary gas replaces the methanol and is ignited, so no methanol condensing liquid damages the catalyst and waste of much methanol can be avoided. The utility model has the advantages of small ground occupation, simple and compact structure, low cost, low resistance, well purified gas mixture and convenient operation and can be used for largely reducing electricity consumption rate and methanol consumption rate in formaldehyde production and prolonging the service life of the catalyst.

Description

The combined type methanol evaporator

Technical field:

The utility model relates to a kind of specific equipment that is used for Formaldehyde Production, particularly a kind of combined type methanol evaporator.

Background technology:

Methanol evaporator is one of major equipment of silver-colored Division A League Matches of French Football aldehyde production equipment, and its effect is to produce methyl alcohol and Air mixing gas.Traditional methanol evaporator is an evaporator with central downcomer, its shortcoming is: 1, air need be at the base of evaporator bubbling to produce methyl alcohol and Air mixing gas, air-distributor, tubulation bundle, methyl alcohol liquid layer are very big to the resistance of air, generally account for the 40-70% of systemic resistance, by system's total-resistance is 50KPa, the vaporizer resistance is generally 20-35KPa, has greatly wasted the blower fan electric energy; To and regulate evaporator temperature with methyl alcohol, air two vigour pre-heating systems when 2, driving, not only waste methyl alcohol, the more important thing is easily like this to make silver-colored catalyst knot carbon thereby make in the later production process methyl alcohol unit consumption higher.3, the evaporator themself structure expends steel with regard to more complicated, and two vigour of generation also will add batching steam on outlet line, again could the dereaction device by superheater, strainer, and huge, the complex structure of equipment, steel consumption are big generally.

Technical scheme:

The purpose of this utility model is to provide a kind of combined type methanol evaporator, it possesses low resistance, low cost of manufacture and has overheatedly, filtering function, needn't and regulate the novel carbinol vaporizer of evaporator temperature with methyl alcohol, air two vigour pre-heating systems.

The utility model is to realize like this.Form by evaporator section, overheated fillter section, loam cake, raffinate thickener four parts; Evaporator section is by cylindrical shell (1), lower cover (2), recycle methanol downstream end (3), dilute methanol inlet connection (4), raffinate thickener liquid phase is taken over (5), gas phase is taken over (6), liquid level meter (7), gas inlet is taken over (8), journal stirrup (9), screen (10), filler (11), recycle methanol sparger (12), column plate (13), refined methanol inlet connection (14), thermometer boss (15), pressure gauge connection (16), scum dredger (17), batching steam distributor (18), flange (19) is formed; Overheated fillter section is made up of flanged (FLGD) lower tubesheet (20), upper shell (21), tubulation (22), upper tubesheet (23), flange (19); Loam cake is made up of flange (19), annular plate (24), standpipe (25), bursting diaphragm assembly (26), mixed gas outlet adapter (27), filter basket (28); The raffinate thickener is by little cylindrical shell (29), flanged (FLGD) lower tubesheet (20), upper tubesheet (23), and tubulation (22), plug-in unit (30), end socket (31), residual liquid discharge are taken over (32), upper cover (33), gaseous phase outlet (34), liquid phase import (35) composition; Its structure, assembled relation are as follows: a lower cover (2) is welded in the cylindrical shell of evaporator section (1) bottom, lower cover (2) foot opening and weld cycle methyl alcohol downstream end (3); The bottom of cylindrical shell (1) is welded with dilute methanol inlet connection (4), raffinate thickener liquid phase is taken over (5), gas phase is taken over (6), liquid level meter (7), gas inlet is taken over (8), methyl alcohol inlet connection (4) wherein, raffinate thickener liquid phase is taken over (5) bottom near liquid level meter (7), gas phase is taken over (6), gas inlet is taken over (8) near liquid level meter (7) top, take on (8) overhead cylinder (1) internal surface contour at gas inlet, weld a plurality of journal stirrups (9) in uniform way, place screen (10) above the journal stirrup (9) successively, filler (11), pass barrel welded and installed recycle methanol sparger (12) in filler (11) top, column plate (13) is installed in the top again, welding refined methanol inlet connection (14) on the barrel of the adjacent column plate in column plate (13) top, the upper space of filler (11) is equipped with scum dredger (17), be welded with thermometer boss (15) and pressure gauge connection (16) on the cylindrical shell (1) between scum dredger (17) and the column plate (13), pass cylindrical shell (1) welded and installed batching steam distributor (18) in scum dredger (17) top, on the cylindrical shell (1) of batching steam distributor (18) top, be welded with a flange (19); The bottom of the upper shell of overheated fillter section (21) is welded with a flanged (FLGD) lower tubesheet (20) and is connected with bolt with evaporator section flange (19).Be welded with upper tubesheet (23) on the cylinder inboard wall of the left and right sides, middle part of upper shell (21), be welded with a large amount of tubulations (22) between lower tubesheet (20) and the upper tubesheet (23), the top of upper shell (21) is welded with flange (19); The upper cover part major parts is the annular plate (24) that some taperings are slightly upwards arranged in the middle of, annular plate (24) outside is welded in flange (19) inboard, annular plate (24) inner edge is welded with standpipe (25), standpipe (25) top is bursting diaphragm assembly (26), side in standpipe (25) is welded with mixed gas outlet and takes over (27); Below annular plate (24), be welded with filter basket (28) and be connected with annular plate (24), filter basket (28) has one or more concentric tubes; The raffinate thickener is a vertical tubular heat exchange, little cylindrical shell (29) two ends are welded with flanged (FLGD) lower tubesheet (23), (20) of going up, be welded with many tubulations (22) between last lower tubesheet, plug-in unit (30) is arranged in the tubulation (22), plug-in unit (30) is than tubulation (22) rod more carefully or the pipe of closed at both ends, or fried dough twist iron; Lower cover (31) foot is welded with a residual liquid discharge and takes over (32), and upper cover (33) top is welded with gaseous phase outlet (34) and links to each other with the gas phase adapter (6) of evaporator section; Upper cover (33) bottom is welded with liquid phase import (35), takes over (5) with the liquid phase of evaporator section and links to each other.

During work, the lower methyl alcohol of the temperature of base of evaporator is membranaceous decline on the filler below the recycle methanol sparger sprays and at filling surface again through recycle methanol downstream end, methanol loop pump, interchanger; Air is taken over from gas inlet and is entered, passing filler contacts with methyl alcohol is reverse, reduce the methyl alcohol dividing potential drop and make it vaporization formation binary gas mixture, the binary gas mixture washs (if column plate is arranged), scum dredger foam removal to reduce the impurity in the gas mixture through refined methanol, add batching steam afterwards again and enter in the tubulation water steam-heated cal(l)andria between tubulation.Mixed gas after overheated is basket filtration after filtration again, takes over from mixed gas outlet and leaves the combined type methanol evaporator.For the purifying methanol raffinate, go into to contain the dilute methanol of formaldehyde to vaporizer more, to the vaporizer additional heat, vaporizer can be matched the raffinate thickener, and the raffinate thickener is preferably shell and tube, also can use plate-type heat exchanger, but work-ing life is low.For the ratio that makes methyl alcohol and air reaches certain requirement, the evaporator section temperature should be regulated according to methanol concentration, evaporator section upper pressure.Owing to saved the heating zone at evaporation position, and because of the heating zone actual internal area of filler actual internal area much larger than conventional evaporator, the diameter of the utility model methanol evaporator can dwindle, so it is 1/6 of the methanol evaporator weight that the utility model methyl alcohol evaporator section under weight is traditional, thereby cheap; The resistance of conventional evaporator is generally 27KPa during full production, and the utility model methyl alcohol evaporator section hollow flow of QI being obstructed is crossed the very big air-distributor of resistance, tubulation bundle, percolation methyl alcohol liquid layer not, only by the very little one deck filler of resistance, thereby the evaporator section resistance is very little, and the resistance of evaporator section is generally less than 1KPa during full production; Set up the raffinate thickener, can concentrate and get rid of the impurity in the vaporizer raffinate, reduce the methanol consumption in the Formaldehyde Production, prolong the work-ing life of catalyzer, the more important thing is because it can improve steam output, so we can increase the aldehyde dilute methanol amount that contains that is entered vaporizer by formaldehyde absorbing tower, that is to say, improved the unreacted methanol rate of recovery in the production, reduced the methyl alcohol unit consumption, simultaneously, owing to from the absorption tower, lead away the dilute methanol formalin, the concentration of formaldehyde products is improved, and maximum concentration can reach 55%.When the dilute methanol formalin entered vaporizer, the concentrated solution of raffinate vaporizer mainly was a formalin, can enter in the formaldehyde products.Refined methanol washing that increases and employing are than the much higher scum dredgers such as silk screen of deflector type scum dredger foam removal efficient in the conventional evaporator, and the impurity that gas mixture is carried secretly is lower, helps keeping the activity of silver catalyst.The utility model integrates evaporation, overheated, filtering function, has reduced occupation area of equipment and steel usage quantity.

The utility model has been owing to adopted syndeton by evaporator section, overheated fillter section, loam cake, raffinate thickener, and having removed from often needs in the traditional method discharge opeing operation of superheater, strainer has also been removed from the injury of band liquid to catalyzer; The igniting interior methyl alcohol outer circulation of preceding vaporizer on the one hand also is heated, temperature progressively raises, on the other hand, little air adds from the batching steam-in, to system and catalyzer heating, when touching the mark, methanol temperature switches gas inlet by superheat section heating back, with the displacement of two vigour, igniting, so both do not had methanol condensed liquid damage catalyzer, needn't waste a large amount of methyl alcohol again.The utility model floor space is little, and is simple and compact for structure, cheap, and resistance is extremely low, and gas mixture purifies, and is convenient to operation, utilizes it can reduce electric unit consumption in the Formaldehyde Production and methyl alcohol unit consumption significantly, prolongs catalyzer work-ing life, is suitable for and applies.

Description of drawings:

Accompanying drawing is an overall structure synoptic diagram of the present utility model.

Embodiment:

Below in conjunction with accompanying drawing enforcement of the present utility model is illustrated.

As shown in the figure, the combined type methanol evaporator is made up of evaporator section, overheated fillter section, loam cake, raffinate thickener four parts; Evaporator section is made up of cylindrical shell 1, lower cover 2, recycle methanol downstream end 3, dilute methanol inlet connection 4, raffinate thickener liquid phase adapter 5, gas phase adapter 6, liquid level meter 7, gas inlet adapter 8, journal stirrup 9, screen 10, filler 11, recycle methanol sparger 12, column plate 13, refined methanol inlet connection 14, thermometer boss 15, pressure gauge connection 16, scum dredger 17, batching steam distributor 18, flange 19; Overheated fillter section is made up of flanged (FLGD) lower tubesheet 20, upper shell 21, tubulation 22, upper tubesheet 23, flange 19; Loam cake is made up of flange 19, annular plate 24, standpipe 25, bursting diaphragm assembly 26, mixed gas outlet adapter 27, filter basket 28; The raffinate thickener is by little cylindrical shell 29, flanged (FLGD) lower tubesheet 20, upper tubesheet 23, and tubulation 22, plug-in unit 30, end socket 31, residual liquid discharge adapter 32, upper cover 33, gaseous phase outlet 34, liquid phase import 35 are formed.Its structure, assembled relation are as follows: a lower cover 2 is welded in cylindrical shell 1 bottom of evaporator section, lower cover 2 foot openings and weld cycle methyl alcohol downstream end 3; The bottom of cylindrical shell 1 is welded with dilute methanol inlet connection 4, raffinate thickener liquid phase takes over 5, gas phase takes over 6, liquid level meter 7, gas inlet takes over 8, wherein the dilute methanol inlet connection 4, raffinate thickener liquid phase is taken over 5 bottoms near liquid level meter 7, gas phase takes over 6, gas inlet is taken over 8 tops near liquid level meter 7, take on 8 overhead cylinder, 1 internal surface contour at gas inlet, weld a plurality of journal stirrups 9 in uniform way, place screen 10 above the journal stirrup 9 successively, filler 11, above filler 11, pass barrel welded and installed recycle methanol sparger 12, column plate 13 is installed in the top again, welding refined methanol inlet connection 14 on the barrel of adjacent column plate above the column plate 13, the upper space of filler 11 is equipped with scum dredger 17, be welded with thermometer boss 15 and pressure gauge connection 16 on the cylindrical shell 1 between scum dredger 17 and the column plate 13, above scum dredger 17, pass cylindrical shell 1 welded and installed batching steam distributor 18, on the cylindrical shell 1 above the batching steam distributor 18, be welded with a flange 19; The bottom of the upper shell 21 of overheated fillter section is welded with a flanged (FLGD) lower tubesheet 20 and is connected with evaporator section flange 19 usefulness bolts; Be welded with upper tubesheet 23 on the cylinder inboard wall of the left and right sides, middle part of upper shell 21, be welded with a large amount of tubulations 22 between lower tubesheet 20 and the upper tubesheet 23, the top of upper shell 21 is welded with flange 19; The upper cover part major parts is the annular plate 24 that some taperings are slightly upwards arranged in the middle of, annular plate 24 outsides are welded in flange 19 inboards, and annular plate 24 inner edges are welded with standpipe 25, and standpipe 25 tops are bursting diaphragm assemblies 26, in the side of standpipe 25, be welded with mixed gas outlet and take over 27; Below annular plate 24, be welded with filter basket 28 and be connected with annular plate 24, filter basket 28 has one or more concentric tubes; The raffinate thickener is a vertical tubular heat exchange, little cylindrical shell 29 two ends are welded with flanged (FLGD)

lower tubesheet

23,20 of going up, and are welded with many tubulations 22 between last lower tubesheet, and plug-in unit 30 is arranged in the tubulation 22, plug-in unit 30 be than tubulation 22 thinner rod or the pipe of closed at both ends, or fried dough twist iron; Lower cover 31 foots are welded with a residual liquid discharge and take over 32, and end socket 33 tops are welded with gaseous phase outlet 34 and link to each other with the gas phase adapter 6 of evaporator section; End socket 33 bottoms are welded with liquid phase import 35, take over 5 with the liquid phase of evaporator section and link to each other.

Claims

1, a kind of combined type methanol evaporator that is used for Formaldehyde Production is made up of evaporator section, overheated fillter section, loam cake, raffinate thickener four parts; Evaporator section is by cylindrical shell (1), lower cover (2), recycle methanol downstream end (3), dilute methanol inlet connection (4), raffinate thickener liquid phase is taken over (5), gas phase is taken over (6), liquid level meter (7), gas inlet is taken over (8), journal stirrup (9), screen (10), filler (11), recycle methanol sparger (12), column plate (13), refined methanol inlet connection (14), thermometer boss (15), pressure gauge connection (16), scum dredger (17), batching steam distributor (18), flange (19) is formed; Overheated fillter section is made up of flanged (FLGD) lower tubesheet (20), upper shell (21), tubulation (22), upper tubesheet (23), flange (19); Loam cake is made up of flange (19), annular plate (24), standpipe (25), bursting diaphragm assembly (26), mixed gas outlet adapter (27), filter basket (28); The raffinate thickener is by little cylindrical shell (29), flanged (FLGD) lower tubesheet (20), upper tubesheet (23), and tubulation (22), plug-in unit (30), end socket (31), residual liquid discharge are taken over (32), end socket (33) gaseous phase outlet (34), liquid phase import (35) is formed; It is characterized in that: a lower cover (2) is welded in the cylindrical shell of evaporator section (1) bottom, lower cover (2) foot opening and weld cycle methyl alcohol downstream end (3); The bottom of cylindrical shell (1) is welded with dilute methanol inlet connection (4), raffinate thickener liquid phase is taken over (5), gas phase is taken over (6), liquid level meter (7), gas inlet is taken over (8), methyl alcohol inlet connection (4) wherein, raffinate thickener liquid phase is taken over (5) bottom near liquid level meter (7), gas phase is taken over (6), gas inlet is taken over (8) near liquid level meter (7) top, take on (8) overhead cylinder (1) internal surface contour at gas inlet, weld a plurality of journal stirrups (9) in uniform way, place screen (10) above the journal stirrup (9) successively, filler (11), pass barrel welded and installed recycle methanol sparger (12) in filler (11) top, column plate (13) is installed in the top again, welding refined methanol inlet connection (14) on the barrel of the adjacent column plate in column plate (13) top, the upper space of filler (11) is equipped with scum dredger (17), be welded with thermometer boss (15) on the cylindrical shell (1) between scum dredger (17) and the column plate (13) and tensimeter connects (16), pass cylindrical shell (1) welded and installed batching steam distributor (18) in scum dredger (17) top, on the cylindrical shell (1) of batching steam distributor (18) top, be welded with person's saying orchid (19); The bottom of the upper shell of overheated fillter section (21) is welded with a flanged (FLGD) lower tubesheet (20) and is connected with bolt with evaporator section flange (19).Be welded with upper tubesheet (23) on the cylinder inboard wall of the left and right sides, middle part of upper shell (21), be welded with a large amount of tubulations (22) between lower tubesheet (20) and the upper tubesheet (23), the top of upper shell (21) is welded with flange (19); The upper cover part major parts is the annular plate (24) that some taperings are slightly upwards arranged in the middle of, annular plate (24) outside is welded in flange (19) inboard, annular plate (24) inner edge is welded with standpipe (25), standpipe (25) top is bursting diaphragm assembly (26), side in standpipe (25) is welded with mixed gas outlet and takes over (27); Below annular plate (24), be welded with filter basket (28) and be connected with annular plate (24), filter basket (28) has one or more concentric tubes; The raffinate thickener is a vertical tubular heat exchange, little cylindrical shell (29) two ends are welded with flanged (FLGD) lower tubesheet (23), (20) of going up, be welded with many tubulations (22) between last lower tubesheet, plug-in unit (30) is arranged in the tubulation (22), plug-in unit (30) is than tubulation (22) rod more carefully or the pipe of closed at both ends, or fried dough twist iron; Lower cover (31) foot is welded with a residual liquid discharge and takes over (32), and end socket (33) top is welded with gaseous phase outlet (34) and links to each other with the gas phase adapter (6) of evaporator section; End socket (33) bottom is welded with liquid phase import (35), takes over (5) with the liquid phase of evaporator section and links to each other.