CN110773030A

CN110773030A - Mixer heating device

Info

Publication number: CN110773030A
Application number: CN201911210421.6A
Authority: CN
Inventors: 孔德利; 宋国天; 唐印; 莫玉馨
Original assignee: Sichuan Golden Elephant Sincerity Chemical Co Ltd; Beijing Edgein Technology Co Ltd
Current assignee: Sichuan Golden Elephant Sincerity Chemical Co Ltd; Beijing Edgein Technology Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-02-11

Abstract

The invention provides a heating device of a mixer, relates to the technical field of mixing and heating, and aims to solve the technical problem that in the prior art, the mixing effect is not ideal due to the fact that the heating device in the mixer is single in arrangement and heating materials are not uniform enough. The mixer heating device comprises a shell and a stirring device, wherein the shell is provided with a material containing cavity, and a stirring blade of the stirring device is arranged in the material containing cavity; a first heating device and a second heating device are sequentially arranged between the shell and the outer peripheral side of the stirring area of the stirring blade, and a third heating device capable of heating the side wall of the shell is arranged outside the shell; gaps are arranged between the shell and the inner wall of the first heating device, between the first heating device and the second heating device, and between the second heating device and the stirring blade.

Description

Mixer heating device

Technical Field

The invention relates to the technical field of mixing heating, in particular to a heating device of a mixer.

Background

In actual manufacturing, a mixer heating device is needed in many occasions. Take NPK fertilizer as an example. The NPK fertilizer refers to a fertilizer containing nitrogen, phosphorus and potassium elements, and is usually used for representing the nutrient proportion in a compound fertilizer, wherein the proportion is represented by the percentage content, such as: 15-15-15, which means that the nitrogen, phosphorus and potassium nutrients contained in the fertilizer respectively account for 15 percent of the total weight.

In the actual production process of the fertilizer, a material containing the above elements, such as: monoammonium phosphate, potassium sulfate, ammonium nitrate and the like are mixed and heated to prepare a melt, and then granulation is carried out to obtain a final finished product. In order to ensure the granulation quality of the compound fertilizer, the retention time, the temperature control, the uniform mixing and the like of the mixed substances in the mixer have higher requirements.

The blender in the prior art comprises a heating device, but the arrangement form of the heating device is single, so that the mixing effect of the heating device on materials is not ideal enough.

Disclosure of Invention

The invention aims to provide a heating device of a mixer, which aims to solve the technical problem that the mixing effect is not ideal due to the fact that the heating device in the mixer is single in arrangement and heating materials are not uniform enough in the prior art.

An embodiment of the present invention provides a heating device for a mixer, including: a housing and a stirring device; the shell is provided with a material containing cavity, and a stirring blade of the stirring device is arranged in the material containing cavity; a first heating device and a second heating device are sequentially arranged between the shell and the outer periphery side of the stirring area of the stirring blade, and a third heating device capable of heating the side wall of the shell is arranged outside the shell.

Gaps are reserved between the shell and the inner wall of the first heating device, between the first heating device and the second heating device, and between the second heating device and the stirring blade.

In an alternative embodiment, the first heating means comprises a plurality of groups of heat exchange tube sets arranged circumferentially with respect to the stirring blade.

The second heating device comprises a plurality of second heat exchange tubes which are arranged in a cylindrical shape.

In an alternative embodiment, each of the heat exchange tube sets includes a plurality of first heat exchange tubes, and each of the first heat exchange tubes is arranged in a plurality of S-shaped structures in a vertical direction; a plurality of first heat exchange tubes are arranged in parallel in the vertical direction, and are arranged in a trapezoidal mode on the same horizontal plane.

In an alternative embodiment, the S-shaped structure comprises a straight tube section and an arcuate section connecting two of the straight tube sections;

the vertical distance between the two straight pipe sections is 20 mm-100 mm.

And/or the length of each first heat exchange tube is not more than 10 m.

And/or the distance between the two first heat exchange tubes is 20 mm-100 mm.

In an alternative embodiment, the second heating means includes a plurality of second heat exchange tubes arranged side by side and formed in a cylindrical shape in a spiral form in a vertical direction.

In an alternative embodiment, the housing is circular in cross-section; the inner diameter of a cylinder formed by the second heat exchange tubes is 0.4-0.8 times of the diameter of the shell.

In an alternative embodiment, two adjacent sets of heat exchange tube banks share a first inlet manifold and a first outlet manifold.

The inlet ends of the second heat exchange tubes are communicated with the adjacent first inlet manifold, and the outlet ends of the second heat exchange tubes are communicated with the corresponding first outlet manifold.

In an alternative embodiment, the third heating device comprises a heating tube.

The heating pipe is one, and the heating pipe is spirally wound on the shell along the axial direction of the shell.

Or the heating pipes are multiple, each heating pipe is wound on the shell for a circle, the inlet end of each heating pipe is communicated with the second inlet header pipe, and the outlet end of each heating pipe is communicated with the second outlet header pipe.

In an alternative embodiment, the inlet end of the heating tube is at a higher level than the outlet end of the heating tube.

In an alternative embodiment, the stirring device comprises a stirring shaft pivoted on the shell and a power assembly in transmission connection with the stirring shaft.

The stirring blade is connected with the stirring shaft; the cross section of the shell is circular, and the diameter of the stirring blade is 0.3-0.8 times of the diameter of the shell.

Has the advantages that:

in the mixer heating device provided by the invention, the first heating device and the second heating device are both positioned in the material containing cavity and can directly heat the material in the material containing cavity, the third heating device is arranged outside the shell and can heat the side wall of the shell, moreover, the first heating device and the second heating device are arranged between the shell and the outer peripheral side of the stirring area of the stirring blade, and a gap is arranged between the shell and the inner wall of the first heating device, and gaps are respectively arranged between the first heating device and the second heating device and between the second heating device and the stirring blade, therefore, under the action of the stirring device, the material can be simultaneously heated by the first heating device and the third heating device when flowing between the shell and the inner wall of the first heating device, and the material can be simultaneously heated by the first heating device and the second heating device when flowing in the gap between the first heating device and the second heating device, correspondingly, when the material flows in the gap between the second heating device and the stirring blade, the material can be heated by the second heating device, so that the material can be uniformly heated in the material containing cavity; moreover, first heating device and second heating device can play the effect that separates the fender, can make the material get into another clearance by a clearance in holding the material cavity, form multiple circulation, and simultaneously under stirring vane's stirring effect, it is faster to move heat for heat transfer efficiency is higher, prepares for making the material homogeneous mixing.

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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a front view of a heating device of a mixer, showing an internal structure, according to an embodiment of the present invention, wherein a first heating device is a simplified diagram, which is simplified to a rectangular frame;

FIG. 2 is a view of a mixer heating apparatus provided in an embodiment of the present invention, taken at a position and projected downward;

FIG. 3 is a schematic view showing the arrangement of a first heat exchange tube in the vertical direction;

FIG. 4 is a schematic view of four second heat exchange tubes formed in a cylindrical shape in a spiral form;

fig. 5 is a schematic view of an arrangement structure of a third heating device outside a housing in a heating device of a mixer according to an embodiment of the present invention.

Icon:

100-a housing;

210-a first heating device; 220-second heating means; 230-a third heating device; 240-a first inlet manifold; 250-a first outlet manifold;

211-heat exchange tube set; 221-a second heat exchange tube; 231-a heating tube; 232-a second inlet manifold; 233-a second outlet manifold;

2111-a first heat exchange tube; 2321-media inlet; 2331-media outlet;

300-a stirring device; 310-a stirring shaft; 320-stirring blades; 330-motor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The present embodiment provides a mixer heating apparatus, as shown in fig. 1, including: a housing 100 and a stirring device 300; the casing 100 has a material accommodating cavity, and the stirring blade 320 of the stirring device 300 is arranged in the material accommodating cavity; a first heating device 210 and a second heating device 220 are sequentially arranged from the shell 100 to the outer periphery of a stirring area of the stirring blade 320, and a third heating device 230 capable of heating the side wall of the shell 100 is arranged outside the shell 100; gaps are formed between the casing 100 and the inner wall of the first heating device 210, between the first heating device 210 and the second heating device 220, and between the second heating device and the stirring blade 320.

In the heating device of the mixer provided in this embodiment, the first heating device 210 and the second heating device 220 are both located in the material containing cavity, and can directly heat the material in the material containing cavity, the third heating device 230 is disposed outside the casing 100 and can heat the sidewall of the casing 100, further, the first heating device 210 and the second heating device 220 are disposed between the casing 100 and the outer periphery of the stirring region of the stirring blade 320, and between the casing 100 and the inner wall of the first heating device 210, and between the first heating device 210 and the second heating device 220, and between the second heating device 220 and the stirring blade 320, and therefore, when the material flows between the casing 100 and the inner wall of the first heating device 210 under the action of the stirring device 300, the material can be simultaneously heated by the first heating device 210 and the third heating device 230, and when the material flows in the gap between the first heating device 210 and the second heating device 220, can be heated by the first heating means 210 and the second heating means 220 simultaneously, and accordingly, the material can be heated by the second heating means 220 while flowing in the gap between the second heating means 220 and the stirring blade 320, thereby enabling the material to be uniformly heated in the material accommodating chamber; moreover, the first heating device 210 and the second heating device 220 can play a role of blocking, so that the material can enter the other gap from one gap in the material accommodating cavity to form multiple circulation, and meanwhile, under the stirring action of the stirring blades 320, the heat is transferred more quickly, so that the heat transfer efficiency is higher, and the preparation is prepared for uniformly mixing the material.

Particularly, the mixing effect of the materials can be improved while the materials are uniformly heated. By using the mixer heating device, the solid materials in the material containing cavity can be better melted into liquid materials through the first heating device 210, the second heating device 220 and the third heating device 230, and the liquid materials are fully mixed through the stirring device in the material containing cavity, so that relatively uniform mixed liquid materials are obtained, a good mixing effect can be ensured, and preparation work is prepared for the next process (such as granulation).

In addition, the third heating device 230 can also perform a certain heat preservation function on the casing 100 to reduce the dissipation of heat in the casing 100.

It should be noted that, in addition to the first heating device 210, the second heating device 220, and the third heating device 230, other structural forms of heating devices may be added, and of course, the heating device in this embodiment can achieve uniform heating of the material, and ensure a better heating effect.

In this embodiment, as shown in fig. 2, the first heating device 210 includes a plurality of sets of heat exchange tube sets 211, and the plurality of sets of heat exchange tube sets 211 are arranged circumferentially with respect to the stirring blade 320.

In one embodiment, as shown in fig. 3, each heat exchange tube set 211 comprises a plurality of first heat exchange tubes 2111, each first heat exchange tube 2111 is arranged in a plurality of S-shaped structures in the vertical direction, the plurality of first heat exchange tubes 2111 are arranged in parallel in the vertical direction, and the plurality of first heat exchange tubes 2111 are arranged in a trapezoid shape in the same horizontal plane.

As shown in fig. 2, one specific embodiment is: the number of the first heat exchange tubes 2111 in each heat exchange tube set 211 is six, the six first heat exchange tubes 2111 are arranged in a trapezoidal shape on the same horizontal plane as shown in fig. 2, and each first heat exchange tube 2111 is arranged in a plurality of S-shaped structures in the vertical direction as shown in fig. 3.

It should be noted that, since the six first heat exchange tubes 2111 are arranged in a trapezoid shape on the same horizontal plane, the length of each first heat exchange tube 2111 may be different, and the width w of the S-shaped structure in each first heat exchange tube 2111 on the horizontal plane is different.

It should be noted that the cross section of the housing 100 in this embodiment may be square, polygonal, circular, or the like. In order to improve the heating effect of the material, the first heating device 210 and the second heating device 220 may be adapted to the cross-sectional shape of the casing 100.

In this embodiment, as shown in fig. 1, the S-shaped structure comprises a straight pipe section and an arc section connecting the two straight pipe sections; the vertical distance d between the two straight pipe sections is 20 mm-100 mm, preferably 45 mm-55 mm, and the distance between the two first heat exchange pipes 2111 is 20 mm-100 mm; the advantage of this setting is, can make the arrangement density of first heat exchange tube 2111 appropriate, reduces the flow resistance of liquid material in corresponding pipeline, practices thrift the energy consumption when the stirring (between many first heat exchange tubes 2111, all leave the clearance on a plurality of directions, can reduce agitating unit's stirring resistance, reduce the energy consumption relatively), plays the effect of intensive mixing, and the difficult scale deposit of inner wall of corresponding pipeline.

The length of each first heat exchange tube 2111 is not more than 10m, preferably not more than 6m, so that the area of the first heat exchange tube 2111 can be fully utilized, the temperature of the first heat exchange tube 2111 is more uniform, and the efficiency is higher.

As shown in fig. 1, the first inlet header 240 and the first outlet header 250 are both horizontally disposed, and the first inlet header 240 is located above the first outlet header 250, so as to ensure that the heat exchange medium can enter different first heat exchange tubes 2111 through the first inlet header 240, flow downwards along the spiral extension direction of the first heat exchange tubes 2111 to the first outlet header 250 at the lower end, and finally be discharged through the first outlet header 250, and the above cycle is repeated after a while to realize the circulation operation of the heat exchange medium.

With continued reference to fig. 1, the inlet end of the first inlet manifold 240 and the outlet end of the first outlet manifold 250 both extend outside the housing 100 to facilitate connection of tubes for circulating the heat exchange medium outside the housing 100.

In this embodiment, the second heating means 220 includes a plurality of second heat exchanging pipes 221, and the plurality of second heat exchanging pipes 221 are cylindrically arranged with respect to the agitating blade 320.

In this embodiment, the cross-section of the housing 100 is circular; the inner diameter of the cylinder formed by the plurality of second heat exchange tubes 221 is 0.4 to 0.8 times of the diameter of the shell 100. The cylindrical second heating device 220 can function as a guide cylinder, and under the action of the stirring device 300, media inside and outside the guide cylinder of the material in the shell 100 can form internal circulation inside and outside the guide cylinder (i.e., between the second heating device 220 and the stirring blade 320) (i.e., between the second heating device 220 and the first heating device 210), so as to play a role in enhancing mixing; in addition, the second heat exchange tube 221 is used as a guide cylinder, so that the equipment space is fully utilized, the heat exchange area is increased, and the heat transfer is enhanced.

As shown in fig. 1 and 2, two adjacent sets 211 of heat exchange tube banks share a first inlet manifold 240 and a first outlet manifold 250; the inlet ends of the second plurality of heat exchange tubes 221 communicate with their adjacent first inlet manifolds 240 and the outlet ends of the second plurality of heat exchange tubes 221 communicate with their respective first outlet manifolds 250.

In this configuration, the heat exchange medium can enter the different first heat exchange tubes 2111 through the first inlet header 240 and the second heat exchange tubes 221 communicating therewith, a part of the heat exchange medium flows down in the direction of the spiral extension of the first heat exchange tubes 2111 to the first outlet header 250 at the lower end, and another part of the heat exchange medium flows in the second heat exchange tubes 221 to the first outlet header 250 at the lower end and is finally discharged through the first outlet header 250.

Among them, the form in which the first heat exchange pipe 2111 and the second heat exchange pipe 221 share the first inlet header 240 and the first outlet header 250 enables the number of pipes in the apparatus to be relatively reduced, making the overall structure simpler.

Specifically, in one embodiment, the heat exchange tube banks 211 are eight banks, wherein two adjacent banks 211 share one first inlet manifold 240 and one first outlet manifold 250, i.e., each of the first inlet manifold 240 and the first outlet manifold 250 is four.

As shown in fig. 2, the included angle between two adjacent first inlet manifolds 240 is 90 °; the angle between two adjacent first outlet manifolds 250 is also 90 °.

It should be noted that the number of the heat exchange tube sets 211 is not limited to eight, and may be four, six, etc., and when the number of the heat exchange tube sets 211 is changed, the number of the first inlet manifold 240 and the first outlet manifold 250 also needs to be adjusted accordingly.

In one embodiment, a plurality of second heat exchange tubes 221 are arranged side by side and formed in a cylindrical shape in a spiral form in a vertical direction; the inlet ends of the plurality of second heat exchange tubes 221 are spaced apart, and the outlet ends of the plurality of second heat exchange tubes 221 are spaced apart.

Wherein, in conjunction with fig. 2 and 4, the second heat exchange tubes 221 are four, and the four second heat exchange tubes 221 are arranged side by side in the vertical direction without a gap therebetween (wherein, fig. 4 is a schematic view in which the four second heat exchange tubes 221 are formed in a cylindrical shape in a spiral form, and actually, the four second heat exchange tubes 221 are formed in a cylindrical shape in a spiral form without a gap therebetween) and are formed in a cylindrical shape in a spiral form in the vertical direction. In this embodiment, the third heating device 230 includes a heating pipe 231, and the heating pipe 231 is disposed around the housing 100. The third heating device 230 has good pressure resistance, when the temperature in the casing 100 reaches 120-200 ℃, the pressure in the heating pipe 231 is 0.5-10 Mpa, and the temperature in the casing 100 changes greatly along with the different proportions of the mixed materials, so the heating mode of the third heating device 230 is more suitable for occasions with high temperature and large temperature change.

In one embodiment, the heating pipe 231 is a single pipe (not shown in the drawings), and the heating pipe 231 is spirally wound around the casing 100 along the axial direction of the casing 100.

In another embodiment, as shown in fig. 5, the heating pipes 231 are multiple, each heating pipe 231 is wound on the casing 100 for one turn (this arrangement has the advantage that the temperature of the heat exchange medium is not reduced too much, and when the temperature in the casing 100 reaches 160 ℃, the pressure of the heat exchange medium is correspondingly 1.6 Mpa), and the inlet end of each heating pipe 231 is communicated with the second inlet manifold 232, and the outlet end of each heating pipe 231 is communicated with the second outlet manifold 233.

Each heating pipe 231 can be welded to the casing 100 by welding; of course, it may be connected to the housing 100 by a connector.

With continued reference to fig. 5, the inlet end of the heating tube 231 is at a higher elevation than the outlet end of the heating tube 231. The upper end of the second inlet manifold 232 is a medium inlet 2321, and the lower end of the second outlet manifold 233 is a medium outlet 2331, when the heat exchanger works, the heat exchange medium enters different heating pipes 231 from the medium inlet 2321 of the second inlet manifold 232, and the heat exchange medium autonomously flows under the action of gravity, and respectively flows into the second outlet manifold 233, and finally is discharged through the medium outlet 2331 at the lower end of the second outlet manifold 233.

It should be noted that the heat exchange medium mentioned above may be steam, heat transfer oil or molten salt.

In this embodiment, the stirring device 300 may be a push type stirring device, and the stirring device 300, together with the first heating device, the second heating device 220, and the third heating device 230, can form an internal circulation of the material in the casing 100, so as to enhance the mixing.

In one embodiment of the stirring device 300, as shown in fig. 1, the stirring device 300 includes a stirring shaft 310 pivoted to the casing 100 and a power assembly drivingly connected to the stirring shaft 310; the stirring blade 320 is connected to the stirring shaft 310; the cross section of the shell 100 is circular, and the diameter of the stirring blade 320 is 0.3-0.8 times of the diameter of the shell 100. The stirring blade 320 can cooperate with the second heating device 220, so that the liquid material forms an internal and external circulation between the second heating device 220 and the first heating device 210, and between the second heating device 220 and the stirring shaft 310, and further plays a role in enhancing mixing.

Wherein, the power assembly comprises a motor 330 and a speed reducer in transmission connection with the motor 330; wherein, the output end of the speed reducer is in transmission connection with the stirring shaft 310.

When the stirring machine works, the motor 330 works to drive the speed reducer to work, so that the stirring shaft 310 rotates, and further the stirring blades 320 are driven to rotate, and the purpose of stirring is achieved.

In one embodiment, the stirring speed is high speed stirring, and the rotation speed is preferably 100-400 rpm, such as: the rotation speed was 200 rpm.

The mixer heating device can be used in the occasion where a plurality of materials need to be heated and uniformly mixed, and is not limited to be used in the preparation process of chemical fertilizers, particularly NPK fertilizers.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mixer heating apparatus, comprising: a housing (100) and a stirring device (300);

the shell (100) is provided with a material containing cavity, and a stirring blade (320) of the stirring device (300) is arranged in the material containing cavity;

a first heating device (210) and a second heating device (220) are sequentially arranged from the shell (100) to the outer periphery of a stirring area of the stirring blade (320), and a third heating device (230) capable of heating the side wall of the shell (100) is arranged outside the shell (100);

gaps are reserved between the shell (100) and the inner wall of the first heating device (210), between the first heating device (210) and the second heating device (220), and between the second heating device and the stirring blade (320).

2. The mixer heating arrangement according to claim 1, wherein the first heating arrangement (210) comprises a plurality of sets of heat exchange tube sets (211), the sets of heat exchange tube sets (211) being arranged circumferentially with respect to the stirring blade (320).

3. A mixer heating arrangement according to claim 2, wherein each group of heat exchange tube sets (211) comprises a plurality of first heat exchange tubes (2111), each of the first heat exchange tubes (2111) being arranged in a plurality of S-shaped configurations in the vertical direction;

the plurality of first heat exchange tubes (2111) are arranged in parallel in the vertical direction, and the plurality of first heat exchange tubes (2111) are arranged in a trapezoid shape on the same horizontal plane.

4. The mixer heating apparatus according to claim 3 wherein the S-shaped structure comprises a straight tube section and an arcuate section connecting two of the straight tube sections;

the vertical distance between the two straight pipe sections is 20 mm-100 mm; and/or the length of each first heat exchange tube (2111) is not more than 10 m; and/or the distance between the two first heat exchange tubes (2111) is 20-100 mm.

5. A mixer heating apparatus according to any one of claims 2-4, wherein the second heating means (220) comprises a plurality of second heat exchanging pipes (221), the plurality of second heat exchanging pipes (221) being arranged side by side and formed in a cylindrical shape in a spiral form in a vertical direction.

6. The mixer heating device according to claim 5, wherein the cross-section of the housing (100) is circular;

the inner diameter of a cylinder formed by the second heat exchange tubes (221) is 0.4-0.8 times of the diameter of the shell (100).

7. A mixer heating device according to claim 5, characterized in that two adjacent groups (211) of heat exchange tubes share a first inlet manifold (240) and a first outlet manifold (250);

the inlet ends of a plurality of said second heat exchange tubes (221) communicate with their adjacent said first inlet manifolds (240), and the outlet ends of a plurality of said second heat exchange tubes (221) communicate with their respective said first outlet manifolds (250).

8. The mixer heating device according to claim 1, wherein the third heating device (230) comprises a heating pipe (231);

the heating pipe (231) is one, and the heating pipe (231) is spirally wound on the shell (100) along the axial direction of the shell (100);

or, the number of the heating pipes (231) is multiple, each heating pipe (231) is wound on the shell (100) for one circle, the inlet end of each heating pipe (231) is communicated with the second inlet manifold (232), and the outlet end of each heating pipe (231) is communicated with the second outlet manifold (233).

9. The mixer heating device according to claim 8, wherein the inlet end of the heating tube (231) is at a higher level than the outlet end of the heating tube (231).

10. The heating device of any one of claims 1-4 and 8-9, wherein the stirring device (300) comprises a stirring shaft (310) pivoted to the housing (100) and a power assembly drivingly connected to the stirring shaft (310);

the stirring blade (320) is connected to the stirring shaft (310);

the cross section of the shell (100) is circular, and the diameter of the stirring blade (320) is 0.3-0.8 times of the diameter of the shell (100).