CN110665242B

CN110665242B - Combined type methanol evaporator

Info

Publication number: CN110665242B
Application number: CN201910994609.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Linyi Jinlang Chemical Co ltd
Current assignee: Linyi Jinlang Chemical Co ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2022-07-01
Anticipated expiration: 2039-10-18
Also published as: CN110665242A

Abstract

The invention belongs to the technical field of evaporators, and particularly relates to a composite methanol evaporator which comprises a closed box, a shell, a supporting rod, a liquid outlet pipe, a first valve, a mouth pipe, a gooseneck pipe, a hose, a heat preservation layer, a filtering air inlet structure, a filter screen, a fixing frame, a fan, a fixing cover, a short pipe, a first one-way valve, a circulating water pump, a first connecting pipe, a heat preservation sleeve, a constant-temperature heating sheet, a second connecting pipe, a first hollow plate, a glass observation window, a liquid return pipe, a straight pipe, a second valve, a heating pipe, heat dissipation holes, a connector, a bottom block, an arc-shaped plate, an arc-shaped block, a first fine seam, a second fine seam, a booster water pump, a second hollow plate, a second one-way valve, a liquid inlet pipe, a bent pipe, a third hollow plate, a round pipe, a spray nozzle and a sealing cap. According to the invention, the heating evaporation structure can be used for heating and evaporating the contacted methanol, the arc-shaped plate and the arc-shaped block provide a bearing installation space for the heating pipe, and the arc-shaped plate, the arc-shaped block and the heating pipe are matched, so that the contact area during heating and evaporation is increased.

Description

Combined type methanol evaporator

Technical Field

The invention relates to a methanol evaporator, in particular to a composite methanol evaporator, and belongs to the technical field of evaporators.

Background

Methanol is a colorless transparent liquid and has pungent odor; methanol is one of the main raw materials for producing formaldehyde, and in a formaldehyde production system, methanol is evaporated from liquid into gas, and then is used as one of gases for preparing formaldehyde, and other mixed gases are added to finally prepare the formaldehyde.

When the methanol evaporator is used for evaporation, the contact area and the flow path area of methanol are small, and the evaporation efficiency and the evaporation effect of the methanol are possibly low; the methanol evaporator is provided with an air inlet structure which is lack of a filtering structure, and external dust is easy to enter, so that methanol vapor can be polluted, and the quality of the methanol vapor can be influenced; the top of a common methanol evaporator is provided with air, an air outlet is generally fixed, and manual adjustment and fixation are inconvenient, so that inconvenience is brought to use of the methanol evaporator. Therefore, a composite methanol evaporator is proposed to solve the above problems.

Disclosure of Invention

The present invention is directed to a compound methanol evaporator to solve the above problems.

The invention realizes the purpose by the following technical scheme, and the composite methanol evaporator comprises a closed box, a shell, an adjustable air outlet pipe and a liquid dispersion spraying structure, wherein the top of the closed box is fixedly connected with the bottom of the shell through a support rod, the center of the bottom of the shell is fixedly provided with the liquid outlet pipe, the bottom end of the liquid outlet pipe is fixedly provided with a first valve, the bottom end of the first valve is connected with a mouthpiece, the mouthpiece is communicated with the top of the closed box, one end of the adjustable air outlet pipe is communicated with the top of the shell, and the other end of the adjustable air outlet pipe is fixedly provided with a connector;

the heating and evaporating device is characterized in that a heating and evaporating structure is arranged in the shell, a plurality of filtering air inlet structures are arranged on two sides of the shell, the filtering air inlet structures are located on the upper portion of the heating and evaporating structure, the heating and evaporating structure comprises two cambered blocks and an arc-shaped plate arranged at the bottoms of the cambered blocks, an arc-shaped gap is formed between the top of the arc-shaped plate and the bottoms of the cambered blocks, a first slit is formed between the two cambered blocks, second slits are formed between two sides of the arc-shaped plate and inner walls of two sides of the shell, the arc-shaped plate and the cambered blocks are fixedly installed in the shell, a plurality of heating pipes are fixedly embedded in the top of the arc-shaped plate and the tops of the cambered blocks, and two ends of each heating pipe are connected with a hot water supply structure;

the liquid dispersion spraying structure comprises a booster water pump and a round pipe arranged at the top of the heating evaporation structure, a liquid outlet of the booster water pump is communicated with a third hollow plate through a bent pipe, one side of the third hollow plate is communicated with one end of the round pipe, and a plurality of spray heads are fixedly arranged on the surface of the round pipe;

the fixed intercommunication of inlet of pressure boost suction pump has the hollow board of second, the fixed intercommunication in bottom of the hollow board of second has feed liquor pipe and straight tube, the straight tube is provided with the second check valve with the hollow junction of board of second, the straight tube is connected with back the liquid pipe through the second valve, return the fixed intercommunication in liquid bottom of the pipe and one side of seal box.

Preferably, the adjustable air outlet pipe is composed of a gooseneck pipe, a hose and an insulating layer, the gooseneck pipe is sleeved with the hose, and the insulating layer is filled between the gooseneck pipe and the hose.

Preferably, it comprises filter screen, mount, fan, fixed cover, nozzle stub and first check valve to filter the inlet structure, the fixed gomphosis of filter screen is installed in one side of fixed cover, the fixed intercommunication of the opposite side of fixed cover has the nozzle stub, and the terminal fixed mounting of nozzle stub has first check valve, the outer wall of fixed cover and the lateral wall rigid coupling of casing, nozzle stub and the inside intercommunication of casing, fixed cover is inside to be installed the fan through the mount.

Preferably, the hot water supply structure includes two first hollow core slabs and circulating water pump, two first hollow core slabs respectively with the both ends fixed intercommunication of heating pipe, and two first hollow core slabs respectively fixed mounting at the front and the back of casing, circulating water pump's water inlet and delivery port communicate first connecting pipe and second connecting pipe respectively, two one side of first hollow core slab respectively with the terminal intercommunication of first connecting pipe and second connecting pipe, insulation support pipe has been cup jointed on second connecting pipe surface, be provided with the even constant temperature heating piece that sets up of a plurality of between insulation support pipe and the second connecting pipe, circulating water pump and insulation support pipe all with one side rigid coupling of casing.

Preferably, the top both sides of drain pipe all are provided with the bottom block, and the bottom block top is provided with the slope, the bottom block is with the bottom inner wall rigid coupling of casing.

Preferably, the first hollow plate, the second hollow plate and the third hollow plate are all provided with hollow cavity structures, and the first hollow plate, the second hollow plate and the third hollow plate are all rectangular structures.

Preferably, the bottom of the front face of the shell is fixedly embedded with a glass observation window, and the glass observation window is of a rectangular structure.

Preferably, the number of the supporting rods is four, and the four supporting rods are distributed at four corners of the top of the closed box in a rectangular array.

Preferably, the tail end of the circular tube is fixedly sleeved with a sealing cap, and the sealing cap is fixedly connected with the inner side wall of the shell.

Preferably, a plurality of heat dissipation holes are uniformly formed in the surface of the heating pipe, and the heat dissipation holes are of a round hole type structure.

The beneficial effects of the invention are:

(1) the combined type methanol evaporator can heat contacted methanol through the heating evaporation structure to evaporate the methanol, a bearing installation space is provided for the heating pipe through the arc-shaped plate and the arc-shaped blocks, the contact area during heating evaporation is increased through the matching effect of the arc-shaped plate, the arc-shaped blocks and the heating pipe, the evaporation effect is improved, and therefore the evaporation efficiency is improved;

(2) the composite methanol evaporator can spray methanol on the top of the heating evaporation structure through the liquid dispersion spraying structure, so that the methanol is dispersed and is conveniently and fully contacted with the heating pipe, the sprayed methanol flows out of the liquid outlet pipe and enters the closed box, and the methanol can flow back again to enter the liquid dispersion spraying structure through the matching action of the liquid return pipe, the straight pipe and the second one-way valve and is sprayed out again;

(3) the combined type methanol evaporator can filter air entering the shell through the filtering air inlet structure, reduces the entering of dust in the air, avoids influencing the quality of methanol gas, improves the air inlet efficiency of the shell through the filtering air inlet structure, and provides power for the outflow of the methanol gas;

(4) this kind of combined type methyl alcohol evaporimeter can adjust the position of giving vent to anger through adjustable outlet duct, is applicable to the different demands of giving vent to anger, simultaneously through the setting of heat preservation, can provide the heat preservation effect for the gas that passes through, reduces thermal scattering and disappearing, avoids causing the waste to and in the transportation process, the liquefaction of methyl alcohol.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the housing according to the present invention;

FIG. 3 is a schematic structural view of a filtered air intake structure according to the present invention;

FIG. 4 is a schematic view of a first hollow plate and a heating tube according to the present invention;

FIG. 5 is a schematic view of the interior of the gooseneck tube of the present invention;

FIG. 6 is a schematic view of the top structure of the housing of the present invention;

FIG. 7 is a schematic view of the structure of the heating tube and the heat dissipation hole of the present invention.

In the figure: 1. a closed box, 2, a shell, 3, a support rod, 4, a liquid outlet pipe, 5, a first valve, 501, a mouthpiece, 6, a gooseneck pipe, 601, a hose, 602, a heat preservation layer, 7, a filtering air inlet structure, 701, a filter screen, 702, a fixing frame, 703, a fan, 704, a fixing cover, 705, a short pipe, 706, a first one-way valve, 8, a circulating water pump, 9, a first connecting pipe, 10, a heat preservation sleeve, 11, a thermostatic heating sheet, 12, a second connecting pipe, 13, a first hollow plate, 14, a glass observation window, 15, a liquid return pipe, 16, a straight pipe, 17, a second valve, 18, a heating pipe, 1801, a heat dissipation hole, 19, a joint, 20, a bottom block, 21, an arc-shaped plate, 22, an arc-shaped block, 23, a first slit, 24, a second slit, 25, a booster pump, 26, a second hollow plate, 27, a second one-way valve, 28, a liquid inlet pipe, 29, a bent pipe, 30, a third hollow plate, 31. a round tube 32, a spray head 33 and a sealing cap.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Referring to fig. 1-7, a composite methanol evaporator comprises a closed box 1, a shell 2, an adjustable air outlet pipe and a liquid dispersion spraying structure, wherein the top of the closed box 1 is fixedly connected with the bottom of the shell 2 through a support rod 3, a liquid outlet pipe 4 is fixedly installed at the center of the bottom of the shell 2, a first valve 5 is fixedly installed at the bottom end of the liquid outlet pipe 4, the bottom end of the first valve 5 is connected with an interface pipe 501, the interface pipe 501 is communicated with the top of the closed box 1, one end of the adjustable air outlet pipe is communicated with the top of the shell 2, the other end of the adjustable air outlet pipe is fixedly provided with a connector 19, and the connector 19 is used for being connected with external pipelines and devices;

the heating evaporation structure is arranged in the shell 2, the two sides of the shell 2 are respectively provided with a plurality of filtering air inlet structures 7, the filtering air inlet structures 7 are positioned on the upper portion of the heating evaporation structure, the heating evaporation structure comprises two arc-shaped blocks 22 and an arc-shaped plate 21 arranged at the bottom of the arc-shaped blocks 22, an arc-shaped gap is formed between the top of the arc-shaped plate 21 and the bottom of the arc-shaped blocks 22, a first thin seam 23 is formed between the two arc-shaped blocks 22, second thin seams 24 are formed between the two sides of the arc-shaped plate 21 and the inner walls of the two sides of the shell 2, the arc-shaped plate 21 and the arc-shaped blocks 22 are fixedly arranged in the shell 2, a plurality of heating pipes 18 are fixedly embedded at the top of the arc-shaped plate 21 and the top of the arc-shaped blocks 22, the two ends of the heating pipes 18 are connected with a hot water supply structure, the heating evaporation structure and the hot water supply structure can be arranged in parallel and are arranged in the shell 2, further improving the efficiency of heating and evaporation;

the liquid dispersion spraying structure comprises a booster water pump 25 and a round pipe 31 arranged at the top of the heating evaporation structure, a liquid outlet of the booster water pump 25 is communicated with a third hollow plate 30 through a bent pipe 29, one side of the third hollow plate 30 is communicated with one end of the round pipe 31, a plurality of spray heads 32 are fixedly arranged on the surface of the round pipe 31, and the spray heads 32 are used for spraying methanol;

the fixed intercommunication of inlet of pressure boost suction pump 25 has the hollow board 26 of second, the fixed intercommunication of the bottom of the hollow board 26 of second has feed liquor pipe 28 and straight tube 16, the junction of the hollow board 26 of straight tube 16 and second is provided with second check valve 27, straight tube 16 is connected with back liquid pipe 15 through second valve 17, return liquid pipe 15 bottom and the fixed intercommunication in one side of seal box 1, seal box 1 is used for the methyl alcohol of splendid attire outflow.

The adjustable air outlet pipe is composed of a gooseneck pipe 6, a hose 601 and an insulating layer 602, the gooseneck pipe 6 is sleeved with the hose 601, the insulating layer 602 is filled between the gooseneck pipe 6 and the hose 601, the gooseneck pipe 6 can be limited after adjustment, the adjustment of the tail end position of the adjustable air outlet pipe is realized, and the insulating layer 602 is made of asbestos materials; the air inlet filtering structure 7 is composed of a filter screen 701, a fixing frame 702, a fan 703, a fixing cover 704, a short pipe 705 and a first one-way valve 706, the filter screen 701 is fixedly embedded and installed on one side of the fixing cover 704, the other side of the fixing cover 704 is fixedly communicated with the short pipe 705, the tail end of the short pipe 705 is fixedly installed with the first one-way valve 706, the outer wall of the fixing cover 704 is fixedly connected with the outer side wall of the shell 2, the short pipe 705 is communicated with the inside of the shell 2, the fan 703 is installed inside the fixing cover 704 through the fixing frame 702, the filter screen 701 provides filtering for passing air, and the first one-way valve 706 prevents gas in the shell 2 from entering the short pipe 705; the hot water supply structure comprises two first hollow plates 13 and a circulating water pump 8, wherein the two first hollow plates 13 are respectively and fixedly communicated with two ends of a heating pipe 18, the two first hollow plates 13 are respectively and fixedly installed on the front surface and the back surface of a shell 2, a water inlet and a water outlet of the circulating water pump 8 are respectively communicated with a first connecting pipe 9 and a second connecting pipe 12, one side of each of the two first hollow plates 13 is respectively communicated with the tail ends of the first connecting pipe 9 and the second connecting pipe 12, a heat insulation sleeve 10 is sleeved on the surface of the second connecting pipe 12, a plurality of uniformly arranged constant temperature heating sheets 11 are arranged between the heat insulation sleeve 10 and the second connecting pipe 12, the circulating water pump 8 and the heat insulation sleeve 10 are fixedly connected with one side of the shell 2, and the second connecting pipe 12 is made of metal copper, so that heat can be conveniently transferred; bottom blocks 20 are arranged on two sides of the top of the liquid outlet pipe 4, a slope is arranged on the top of each bottom block 20, and the bottom blocks 20 are fixedly connected with the inner wall of the bottom of the shell 2, so that methanol can conveniently enter the liquid outlet pipe 4; the first hollow plate 13, the second hollow plate 26 and the third hollow plate 30 are all provided with a cavity structure, the first hollow plate 13, the second hollow plate 26 and the third hollow plate 30 are all in a rectangular structure, and methanol can enter the first hollow plate 13, the second hollow plate 26 and the third hollow plate 30 to realize the communication of all pipelines; the bottom of the front face of the shell 2 is fixedly embedded with a glass observation window 14, the glass observation window 14 is of a rectangular structure, and the glass observation window 14 is used for observation in the shell 2, so that the methanol can be conveniently discharged; the number of the support rods 3 is four, the four support rods 3 are distributed at four corners of the top of the closed box 1 in a rectangular array, and the support rods 3 are used for fixing and supporting the shell 2; the tail end of the circular tube 31 is fixedly sleeved with a sealing cap 33, the sealing cap 33 is fixedly connected with the inner side wall of the shell 2, and the sealing cap 33 is used for sealing the tail end of the circular tube 31 for plugging; the surface of the heating pipe 18 is uniformly provided with a plurality of heat dissipation holes 1801, the heat dissipation holes 1801 are of a round hole type structure, the heating pipe 18 is made of metal copper, heat transfer is facilitated, the heat dissipation holes 1801 improve the contact area of methanol, and the heat transfer effect is improved.

When the methanol heating device is used, electrical components appearing in the methanol heating device are externally connected with a power supply and a control switch when the methanol heating device is used, a liquid inlet pipe 28 is connected with an external methanol supply structure, methanol enters a second hollow plate 26 from the liquid inlet pipe 28, then enters a boosting water pump 25, the boosting water pump 25 is started to boost the entering methanol, then enters a round pipe 31 through a bent pipe 29 and a third hollow plate 30 in sequence, is sprayed out of a spray head 32, is sprayed on the top of an arc-shaped block 22, then flows to the surface of the arc-shaped plate 21 from a first slit 23, and flows out of a second slit 24, and in the process, the entering methanol heating device is in contact with the surface of a heating pipe 18 to realize heating evaporation, the evaporated and remained methanol is gathered at the bottom of a shell 2, and enters a closed box 1 through a liquid outlet pipe 4 and a connector pipe 501 by opening a first valve 5, the methanol in the closed box 1 sequentially passes through a liquid return pipe 15, a second valve 17 and a straight pipe 16, A second check valve 27 and a second hollow plate 26, which flow back into the booster water pump 25;

the circulating water pump 8 sucks water in one first hollow plate 13 through the first connecting pipe 9, enters the other second hollow plate 26 through the second connecting pipe 12, then enters the heating pipe 18, returns to the first hollow plate 13 through the heating pipe 18 to form a cycle, and heats water through the constant temperature heating plate 11 in the cycle process to maintain the temperature and provide heat;

the gaseous methanol of evaporation is discharged through adjustable outlet duct, and adjustable outlet duct links to each other with outside convulsions structure through connecting 19, carries out gaseous taking out of methanol, can make the air admission casing 2 through filtering inlet structure 7 in, the air filters the back through filter screen 701, gets into casing 2 through nozzle stub 705 and first check valve 706, avoids the entering of dust, and the motor drives the flabellum and rotates, forms the air current, has improved casing 2's the efficiency and the effect of admitting air.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A combined type methanol evaporator is characterized in that: the device comprises a closed box (1), a shell (2), an adjustable air outlet pipe and a scattered liquid spraying structure, wherein the top of the closed box (1) is fixedly connected with the bottom of the shell (2) through a support rod (3), a liquid outlet pipe (4) is fixedly arranged at the center of the bottom of the shell (2), a first valve (5) is fixedly arranged at the bottom end of the liquid outlet pipe (4), the bottom end of the first valve (5) is connected with an interface pipe (501), the interface pipe (501) is communicated with the top of the closed box (1), one end of the adjustable air outlet pipe is communicated with the top of the shell (2), and a joint (19) is fixedly arranged at the other end of the adjustable air outlet pipe;

the heating evaporation structure is arranged in the shell (2), a plurality of filtering air inlet structures (7) are arranged on two sides of the shell (2), the filtering air inlet structures (7) are located on the upper portion of the heating evaporation structure, each heating evaporation structure comprises two arc-shaped blocks (22) and an arc-shaped plate (21) arranged at the bottom of each arc-shaped block (22), an arc-shaped gap is formed between the top of each arc-shaped plate (21) and the bottom of each arc-shaped block (22), a first thin slit (23) is formed between each two arc-shaped blocks (22), second thin slits (24) are formed between two sides of each arc-shaped plate (21) and the inner walls of two sides of the shell (2), the arc-shaped plates (21) and the arc-shaped blocks (22) are fixedly installed in the shell (2), and a plurality of heating pipes (18) are fixedly embedded in the tops of the heating pipes and the arc-shaped blocks (22), two ends of the heating pipe (18) are connected with a hot water supply structure;

the liquid dispersion spraying structure comprises a booster water pump (25) and a round pipe (31) arranged at the top of the heating evaporation structure, a liquid outlet of the booster water pump (25) is communicated with a third hollow plate (30) through a bent pipe (29), one side of the third hollow plate (30) is communicated with one end of the round pipe (31), and a plurality of spray heads (32) are fixedly arranged on the surface of the round pipe (31);

a liquid inlet of the booster water pump (25) is fixedly communicated with a second hollow plate (26), the bottom of the second hollow plate (26) is fixedly communicated with a liquid inlet pipe (28) and a straight pipe (16), a second one-way valve (27) is arranged at the joint of the straight pipe (16) and the second hollow plate (26), the straight pipe (16) is connected with a liquid return pipe (15) through a second valve (17), and the bottom end of the liquid return pipe (15) is fixedly communicated with one side of the closed box (1);

the hot water supply structure comprises two first hollow plates (13) and a circulating water pump (8), the two first hollow plates (13) are respectively and fixedly communicated with two ends of a heating pipe (18), and the two first hollow plates (13) are respectively and fixedly arranged on the front surface and the back surface of the shell (2), a water inlet and a water outlet of the circulating water pump (8) are respectively communicated with a first connecting pipe (9) and a second connecting pipe (12), one side of each of the two first hollow plates (13) is respectively communicated with the tail ends of the first connecting pipe (9) and the second connecting pipe (12), the surface of the second connecting pipe (12) is sleeved with a heat-insulating sleeve (10), a plurality of uniformly arranged constant-temperature heating sheets (11) are arranged between the heat-insulating sleeve (10) and the second connecting pipe (12), the circulating water pump (8) and the heat-insulating sleeve (10) are fixedly connected with one side of the shell (2).

2. The composite methanol evaporator as set forth in claim 1, wherein: filter inlet structure (7) and constitute by filter screen (701), mount (702), fan (703), fixed cover (704), nozzle stub (705) and first check valve (706), the fixed gomphosis of filter screen (701) is installed in one side of fixed cover (704), the fixed intercommunication of the opposite side of fixed cover (704) has nozzle stub (705), and nozzle stub (705) end fixed mounting has first check valve (706), the outer wall of fixed cover (704) and the lateral wall rigid coupling of casing (2), nozzle stub (705) and casing (2) inside intercommunication, fan (703) are installed through mount (702) to fixed cover (704) inside.

3. The composite methanol evaporator as set forth in claim 1, wherein: the top both sides of drain pipe (4) all are provided with bottom block (20), and bottom block (20) top is provided with the slope, bottom block (20) and the bottom inner wall rigid coupling of casing (2)

4. The composite methanol evaporator as set forth in claim 1, wherein: the adjustable air outlet pipe is composed of a gooseneck (6), a hose (601) and an insulating layer (602), the gooseneck (6) is sleeved with the hose (601), and the insulating layer (602) is filled between the gooseneck (6) and the hose (601).

5. The composite methanol evaporator as set forth in claim 1, wherein: the hollow structure is opened to first hollow core slab (13), second hollow core slab (26) and third hollow core slab (30) inside all, and just first hollow core slab (13), second hollow core slab (26) and third hollow core slab (30) are the rectangle structure.

6. The composite methanol evaporator as set forth in claim 1, wherein: the glass observation window (14) is fixedly embedded at the bottom of the front surface of the shell (2), and the glass observation window (14) is of a rectangular structure.

7. The composite methanol evaporator as set forth in claim 1, wherein: the number of the supporting rods (3) is four, and the four supporting rods (3) are distributed at four corners of the top of the closed box (1) in a rectangular array mode.

8. The composite methanol evaporator as set forth in claim 1, wherein: the tail end of the round tube (31) is fixedly sleeved with a sealing cap (33), and the sealing cap (33) is fixedly connected with the inner side wall of the shell (2).

9. The composite methanol evaporator as set forth in claim 1, wherein: a plurality of heat dissipation holes (1801) are uniformly formed in the surface of the heating pipe (18), and the heat dissipation holes (1801) are of a round hole type structure.