CN114370772B - Oxidation furnace heat exchange assembly - Google Patents

Abstract

The embodiment of the invention provides a heat exchange assembly of an oxidation furnace, the oxidation furnace comprises a shell, and the heat exchange assembly comprises: at least two coil assemblies and a waterwall tube set; the coil pipe assembly comprises a plurality of coil pipes which are arranged along the axial direction of the coil pipe assembly; in the horizontal plane of the coil pipe, the coil pipe is coiled from the first inlet lead pipe end to the inside in an equidistant spiral mode according to a first direction to form a plurality of first coil pipe coils with different coil diameters, and the inside of the coil pipe is bent into an S shape; then the coil pipe is coiled from inside to outside in an equidistant spiral mode according to a second direction to form a plurality of second coil pipe coils with different coil diameters; the second coil pipe ring is positioned between two adjacent first coil pipe rings; wherein the first direction is opposite to the second direction. The heat exchange assembly in the embodiment of the invention enables the high-temperature gas to be distributed uniformly in sequence and pass downwards in sequence, and is discharged after heat exchange is carried out from top to bottom and enters a post-process, so that heat energy can be recovered effectively, and the influence of high temperature on the safety and reliability of the ammoxidation furnace can be reduced.

Description

An oxidation furnace heat exchange component

Technical field

The invention relates to the technical field of nitric acid production equipment, and in particular to an oxidation furnace heat exchange component.

Background technique

The oxidation furnace is a key equipment in the production of nitric acid. During the reaction, the oxidation furnace needs an appropriate temperature to maintain the continuous operation of the reaction, and it must also effectively control the furnace wall temperature. Excessive temperature will first shorten the life of the equipment or even damage the equipment.

In the prior art, in order to realize the utilization of heat in the oxidation furnace, a heat recovery device is set up in the oxidation furnace; in order to prevent excessive temperature damage to the equipment, a water-cooling wall assembly is set up; the coil assembly is a heat recovery device composed of multi-layer coils Composed, each layer is a horizontal coiled pipe made of seamless pipes coiled in a spiral manner at equal intervals. The number of coiling turns and coiling method of each layer of coiled pipes are the same, and every two layers of coiled pipes have a first inlet guide pipe. And a first inlet lead pipe, depending on the installation position of each layer of coil in the ammonia oxidation furnace, the high temperature it is subjected to is also different, and the heat absorbed is also different. For example, CN201857267U proposes a coiled pipe assembly. Each layer is a horizontal coiled pipe made of seamless pipes spirally coiled at equal intervals. Different numbers of inlet and first outlet guide pipes are drawn out from each layer of coiled pipes. , although the heat exchange efficiency is improved to a certain extent, the coils of each layer in the coil assembly are arranged in a messy manner, which is difficult to repair and the manufacturing process is difficult, which not only increases the cost of heat exchange but also makes heat exchange management inconvenient. At the same time, with the use of ammonia oxidation furnaces, the temperatures of coils in different layers are different, and the horizontal coils on the same layer cannot always be coiled at equal intervals, resulting in uneven heat exchange and reduced heat exchange efficiency.

Therefore, how to provide an oxidation furnace heat exchange component for efficiently recovering the heat generated by the combustion reaction of the ammonia oxidation furnace and reducing the impact of high temperature on the safety and reliability of the ammonia oxidation furnace is a technical obstacle that those skilled in the art urgently need to solve.

Summary of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. It proposes an oxidation furnace heat exchange assembly so that high-temperature gases can be evenly distributed and pass downwards in sequence; the high-temperature gases can exchange heat from top to bottom. After being discharged and entering the subsequent process, the heat exchange assembly in the embodiment of the present invention can recover heat energy and reduce the impact of high temperature on the safety and reliability of the ammonia oxidation furnace.

In view of this, embodiments of the present invention provide an oxidation furnace heat exchange assembly. The oxidation furnace includes a shell. The heat exchange assembly includes: at least two coil assemblies and a water-cooled wall tube group; two The coil components are arranged at different heights in the housing along the axial direction of the housing; and the two coil components are connected in parallel between the inlet header and the outlet header;

The coiled tube assembly includes a plurality of coiled tubes arranged along the axial direction of the coiled tube assembly; both ends of the coiled tube are respectively connected to a first inlet guide pipe and a first outlet guide pipe; the upper part of the coiled tube is The first outlet guide pipe corresponds to the first inlet guide pipe of the lower coil in the axial direction of the coil assembly; the first inlet guide pipe is connected to the inlet header, and the first outlet guide pipe is connected to the inlet header. The pipe is connected to the outlet header;

In the horizontal plane of the coiled tube, the coiled tube is wound from the first inlet lead pipe end in an equidistant spiral manner from outside to inside in a first direction to form a plurality of first coiled tube circles with different diameters, and The coiled tube is bent into an "S" shape internally and then coiled in an equidistant spiral manner from the inside to the outside in a second direction to form a plurality of second coiled tube rings with different diameters; the second coiled tube tubes are located in opposite directions. between two adjacent first coil rings; wherein the first direction is opposite to the second direction;

The water-cooled wall tube group is circumferentially arranged inside the shell and close to the oxidation furnace shell; and the water-cooled wall tube group is located at the outer circumference of the coil assembly.

In some embodiments, the coil assembly includes a plurality of fixing components, one of the fixing components is provided on each coil; the fixing assembly includes a plurality of tying parts; the plurality of tying parts are respectively It is arranged in a radial annular shape in the plane of the coil and is wrapped around the outside of the coil to secure the coil.

In some embodiments, the fixing component includes a positioning component, and the positioning component includes:

A plurality of first positioning components; a plurality of first positioning components are respectively arranged radially in the plane of the coil; the first positioning component includes a plurality of first positioning members arranged radially in the same direction ; The first positioning piece is clamped in the distance between the first coil ring and the second coil ring; the first positioning piece includes two first positioning blocks arranged back to back; two first positioning blocks; The first positioning blocks respectively align the first coil ring and the second coil ring; and

A plurality of second positioning assemblies; a plurality of second positioning assemblies are respectively arranged radially in the circumferential plane of the coil; the second positioning assemblies include a plurality of second positioning assemblies arranged radially along the same orientation Positioning piece; the second positioning piece is clamped in the distance between the first coil ring and the second coil ring; the second positioning piece includes two second positioning blocks arranged back to back ; The two second positioning blocks are respectively semi-enclosed and clamped on the first coil ring and the second coil ring;

The first position adjustment component and the second position adjustment component are respectively located on both sides of the tie member in the horizontal plane of the coiled pipe.

In some embodiments, the first positioning member and the second positioning member are spaced apart within a distance between the first coil ring and the second coil ring, and the first positioning member and the second positioning member are spaced apart from each other. The second positioning members are alternately arranged within the spacing formed by the first coil ring and the second coil ring.

In some embodiments, the coil assembly includes a plurality of air flow dispersing members, one of which is disposed above each coil; the air flow dispersing members correspond to each other in the axial direction of the coil assembly. In the "S"-shaped structure, the airflow dispersing member blocks the "S"-shaped structure.

In some embodiments, the inlet header is provided with at least two orifice joints; the two orifice joints are respectively connected to two coil assemblies.

In some embodiments, the water-cooled wall tube group includes a plurality of water-cooled wall tubes, an outlet header and an inlet header; wherein a plurality of the water-cooled wall tubes are arranged side by side along the shell. The body is spirally coiled with equal pitch in the axial direction of the body; a second inlet guide pipe and a second outlet guide pipe are respectively provided at both ends of each water-cooled wall tube; the second outlet guide pipes on each of the water-cooled wall tubes are connected respectively The outlet manifold; the second inlet guide pipe on each water-cooled wall tube is connected to the inlet manifold respectively.

In some embodiments, the highest points of the plurality of water-cooled wall tubes in the axial direction of the housing are on the same plane.

In some embodiments, the heat exchange assembly includes a casing; the casing is disposed on the outer circumference of the coil assembly, and the casing is located between the coil assembly and the water wall tube group between.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

Figure 1 is a schematic structural diagram of a heat exchange component of an oxidation furnace according to an embodiment of the present invention.

Figure 2 is a top view of a coil assembly provided by an embodiment of the present invention.

Figure 3 is a schematic structural diagram of a water-cooling wall group provided by an embodiment of the present invention.

Figure 4 is a schematic diagram of the expanded structure of the water-cooled wall tube provided by one embodiment of the present invention.

Figure 5 is a schematic structural diagram of a coil provided by an embodiment of the present invention.

Figure 6 is a schematic structural diagram of another coil provided at the lower level of the coil in Figure 5.

Figure 7 is a schematic cross-sectional structural diagram of a coil provided by an embodiment of the present invention.

FIG. 8 is a top view of FIG. 7 .

Reference signs

Heat exchange component 100; housing 200

Coil assembly 1;

Coil 11;

The first coiled pipe ring 111; the second coiled pipe ring 112; the first inlet guide pipe 113; the first outlet guide pipe 114;

Fixed components 12;

Ties 121;

Position adjustment component 122; first position adjustment component 1221; first positioning component 12211; first positioning block 122111; second positioning component 1222; second positioning component 12221; second positioning block 122211;

Airflow dispersion piece 13;

Import header 2;

Export header 3;

Water wall tube group 4;

Water wall pipe 41; second inlet guide pipe 411; second outlet guide pipe 412;

Exit manifold 42;

Import manifold 43;

Guard 45.

Detailed ways

The present invention is based on the inventor's discovery and understanding of the following facts and problems:

In related art, an oxidation furnace includes a shell, wherein the coil assembly includes at least two groups, and the two coil assemblies are arranged in the axial direction of the shell, wherein the axial direction of the coil assembly coincides with the axial direction of the shell. The two coil components are the coil component of the evaporation section and the coil component of the superheating section. The coil assembly includes a plurality of horizontal coils arranged side by side in the axial direction of the housing, wherein the horizontal coils are made by coiling the coils in a plane in an equidistant spiral manner.

For ease of understanding, the axial direction of the housing in this embodiment is consistent with the up and down direction, and the radial direction is consistent with the left and right directions, as shown in Figure 1 .

In the related art, different numbers of first inlet guide pipes and first outlet guide pipes are drawn out from each layer of horizontal coils. Although the heat exchange efficiency is improved to a certain extent, the ordering of each layer of coils in the coil assembly is It is messy, difficult to maintain and difficult to manufacture, which not only increases the cost of heat exchange but also makes heat exchange management inconvenient. At the same time, with the use of ammonia oxidation furnaces, the temperatures of each layer of disks with different distribution positions are different. The horizontal coils of the same layer cannot always be coiled at equal intervals, resulting in uneven heat exchange and reduced heat exchange efficiency. Therefore, how to provide a compact and regular oxidation furnace heat exchange component for efficient recovery of the heat generated by the combustion reaction of the ammonia oxidation furnace to save energy consumption and reduce the impact of high temperature on the safety and reliability of the ammonia oxidation furnace is an issue. Technical problems that technicians in the field urgently need to solve.

In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. Limitations of Examples.

Example 1

As shown in Figures 1 to 8, an embodiment of the present invention provides an oxidation furnace heat exchange assembly 100. The oxidation furnace includes a shell 200. The heat exchange assembly 100 includes: at least two coil assemblies 1 and a water wall tube group 4 ; wherein the two coil components 1 are arranged at different heights in the casing 200 along the axial direction of the coil component 1, and the two coil components 1 are connected in parallel between the inlet header 2 and the outlet header 3;

The coil assembly 1 includes a plurality of coils 11 arranged along the axial direction of the coil assembly 1; both ends of the coil 11 are respectively connected to the first inlet guide pipe 113 and the first outlet guide pipe 114; the first outlet of the upper coil pipe 11 The guide pipe 114 corresponds to the first inlet guide pipe 113 of the lower coil pipe 11 in the axial direction of the coil assembly 1; the first inlet guide pipe 113 is connected to the inlet header 2, and the first outlet guide pipe 114 is connected to the outlet header 3 connect;

In the horizontal plane of the coiled tube 11, the coiled tube 11 is wound from the first inlet guide pipe 113 end in an equidistant spiral manner from outside to inside to form a plurality of first coiled tube circles 111 with different diameters, and the coiled tube 11 is bent into an "S" shape internally and then coiled in an equidistant spiral manner from the inside to the outside in the second direction to form a plurality of second coils 112 with different diameters; wherein the second coils 112 are located in adjacent Between the two first coil rings 111; where the first direction is opposite to the second direction;

The water-cooling wall tube group 4 is circumferentially disposed inside the shell 200 and close to the oxidation furnace shell 200; and the water-cooling wall tube group 4 is located on the outer circumference of the coil assembly 1.

For ease of understanding, the axial direction of the housing 200 in this embodiment coincides with the axial direction of the coil assembly 1, specifically the up-down direction, and the radial direction in the horizontal plane of the coil 11 coincides with the left-right direction, as shown in Figure 1 shown.

Specifically, as shown in Figure 1, the heat exchange assembly 100 is disposed inside the shell 200 of the oxidation furnace. The heat exchange assembly 100 includes at least two coil assemblies 1 and a water-cooling wall tube group 4. The water-cooling wall tube group 4 is circumferentially It is arranged inside the casing 200 and located at the outer circumference of the coil assembly 1; at least two coil assemblies 1 are arranged side by side inside the casing 200 in the up and down direction.

The coil assembly 1 of the evaporation section and the coil assembly 1 of the superheating section each include a plurality of coils 11 arranged side by side in the up and down direction, as shown in Figures 1-2 and 5-6. The two ends of the coiled pipe 11 are respectively provided with a first inlet guide pipe 113 and a first outlet guide pipe 114, that is, the inlet end of the coiled pipe 11 is connected to the first inlet guide pipe 113, and the inlet and outlet ends of the coiled pipe 11 are connected to the first outlet guide pipe. tube114. The coiled tube 11 is wound from the inlet end in a first direction (clockwise or counterclockwise) in an equidistant spiral from outside to inside to form a plurality of first coiled tube circles 111 with different diameters; the coiled tube 11 is bent into an "S" shape internally. ” shape, and then wind in an equidistant spiral manner in the second direction from the inside to the outside to form a plurality of second coil rings 112 with different diameters. The second coil rings 112 are located between the two adjacent first coil rings 111 between them, as shown in Figure 5.

It can be understood that when the first direction is clockwise coiling, the second direction is counterclockwise coiling; when the first direction is counterclockwise coiling, the second direction is clockwise coiling. And the first coiled pipe ring 111 is arranged in the horizontal plane of the coiled pipe 11, from outside to inside, with the same spacing, but the diameter of the coil changes from large to small; similarly, the second coiled pipe ring 112 is located in the horizontal plane of the coiled pipe 11, from They are arranged in sequence from the inside to the outside with the same spacing, but the circle diameter changes from small to large. The second coiled tube ring 112 is located between two adjacent first coiled tube turns 111 , and is at the same distance from the left and right adjacent first coiled tube turns 111 . It can be understood that the first inlet guide pipe 113 is located on the outermost ring of the first coiled tube ring 111 and the first outlet guide tube 114 is located on the outermost ring of the second coiled tube ring 112 .

It should be noted that during the actual manufacturing process, the coiled pipe 11 in this embodiment can be spirally wound with equal pitch in the same plane, or can be spliced and assembled from multiple arc lines or semicircular lines. . It can be understood that if the coils 11 of each layer are installed at different heights, they will be exposed to different high temperatures and absorb different amounts of heat. Therefore, the pitch of the spirals of the coils 11 of different layers may be different.

It can be understood that, as shown in Figures 5 and 6, the first outlet guide pipe 114 of the upper coil 11 corresponds to the first inlet guide 113 of the lower coil 11 in the up and down direction, which facilitates the connection between the upper coil 11 and the lower coil. Pipe 11 is assembled and connected.

Advantageously, in order to further cope with the different installation heights of the coils 11 of each layer and the different high temperatures they are exposed to, the coils 11 can be combined. For example, in order to improve the heat exchange efficiency and increase the service life of the coil assembly 1, in some coils 11 that are subject to higher temperatures in the coil assembly 1, each layer of coils 11 uses the first inlet guide pipe 113. The inlet connecting pipe is connected to the inlet header 2, and the first outlet guide pipe 114 is connected to the outlet header 3 through the outlet connecting pipe to realize one liquid inlet end and one liquid outlet end of the one-layer coil 11; In some coils 11 subject to lower temperatures, two layers of coils 11 can be used as a group. Specifically, Figure 5 shows the upper coil 11, and Figure 6 shows the lower coil. The first inlet guide pipe 113 of the upper coil 11 passes through The inlet connecting pipe is connected to the inlet header 2; the first outlet guide pipe 114 of the upper coil 11 is connected to the first inlet guide 113 of the lower coil 11; the first outlet guide 114 of the lower coil 11 passes through the outlet connecting pipe Connect the outlet header 3 to realize one liquid inlet end and one liquid outlet end of the second-layer disk. In the same way, it can be seen that when some coils 11 in the coil assembly 1 are subjected to very low temperatures, three or even multiple layers are set up as mentioned above. The coil 11 has a liquid inlet end and a liquid outlet end. The above settings are exemplary but non-limiting descriptions, and those skilled in the art can flexibly combine the specific settings of the coil 11 according to actual needs.

It should be noted that when the two layers of coiled tubes 11 form a group, the upper coiled tube 11 is wound clockwise from the inlet end in an equidistant spiral manner from outside to inside to form a plurality of first coiled tube rings 111 with different diameters; And the upper coil 11 is bent into an "S" shape inside and then coiled counterclockwise in an equidistant spiral from inside to outside to form a plurality of second coil circles 112 with different diameters. between two adjacent first coil rings 111. The first outlet guide pipe 114 of the upper coil 11 corresponds to the first inlet guide 113 of the lower coil 11 in the up and down direction, and the upper coil 11 and the lower coil 11 are assembled and connected; the lower coil 11 follows the inverse direction from the inlet end. A plurality of first coil tube rings 111 with different diameters are formed by winding in an equidistant spiral manner in the clockwise direction from outside to inside, and the lower coil tube 11 is bent into an "S" shape internally, and then is wound in an equidistant spiral manner in a clockwise direction. A plurality of second coil rings 112 with different diameters are formed by winding from inside to outside, and the second coil rings 112 are located between two adjacent first coil rings 111 . That is, when the upper and lower coils 11 are to be connected, the lower coil 11 uses the opposite winding direction to the upper coil 11 .

Specifically, the inlet header 2 is provided with at least two orifice joints; one of the orifice joints is connected to the coil assembly of the evaporation section; the other orifice joint is connected to the coil assembly 1 of the superheating section. Two of the orifice joints can make the amount of water in the coil assembly 1 of the evaporation section and the coil assembly 1 of the superheating section different.

In some embodiments, the coiled tube assembly 1 includes a plurality of fixing components 12, one fixing component 12 is provided on each coiled tube 11; the fixed component 12 includes a plurality of tying members 121; the plurality of tying members 121 are respectively mounted on the coiled tube. 11 is arranged in a radial annular shape in the horizontal plane and is wrapped around the outside of the coil 11 to solidify the coil 11 .

Specifically, as shown in FIGS. 6 to 8 , the tie member 121 can be understood as a flat steel bar. The flat steel bar is arranged radially and annularly in the plane of the coil 11 to cover the outside of the coil 11 . Those skilled in the art can set up multiple flat steel bars according to the actual situation. For example, when 4 flat steel bars are set, the intervals between the flat steel bars are 90°; those skilled in the art can also set up 6 flat steel bars or 8 flat steel bars. Flat steel bars, etc. The binding member 121 is annularly wrapped around the outside of the coil 11, and binds the middle and edge of the coil 11 to fix the innermost coil 11 and the outermost coil 11 of the coil 11 to prevent random movement. As the production time increases, the coil 11 deforms, that is, the distance between the innermost coil 11 and the outermost coil 11 of the coil 11 becomes larger, resulting in uneven heat exchange and reduced heat exchange efficiency. situation.

Further, the fixing component 12 includes a position adjustment component 122. The position adjustment component 122 includes a plurality of first position adjustment components 1221 and a plurality of second position adjustment components 1222: the plurality of first position adjustment components 1221 are respectively located around the coil pipe 11. Evenly distributed in the plane; the first positioning component 1221 includes a plurality of first positioning parts 12211 arranged radially in the same direction; the first positioning parts 12211 are clamped between the first coil ring 111 and the second coil ring 112 within the spacing between them; the first positioning member 12211 includes two first positioning blocks 122111 arranged back to each other; the first positioning blocks 122111 respectively semi-enclose the first coil ring 111 and the second coil ring 112; a plurality of The second positioning components 1222 are evenly arranged in the circumferential plane of the coil 11; the second positioning components 1222 include a plurality of second positioning members 12221 arranged radially in the same direction; the second positioning members 12221 are clamped on the second positioning member 12221. within the distance between a coiled tube ring 111 and a second coiled tube ring 112; the second positioning member 12221 includes two second positioning blocks 122211 arranged back to each other; the second positioning blocks 122211 respectively align the first coiled tube ring 111 and The second coil ring 112 is semi-encircled and clamped;

The first position adjustment component 1221 and the second position adjustment component 1222 are respectively located on both sides of the binding member 121 in the horizontal plane of the coil pipe 11 .

As specifically shown in Figures 7 and 8, the first position adjustment component 1221 and the second position adjustment component 1222 are evenly arranged on the circumferential plane of the coil 11. It can be understood that the first position adjustment component 1221 and the second position adjustment component 1222 are all evenly arranged in the circumferential direction.

The first positioning component 1221 includes a plurality of first positioning parts 12211 arranged radially in the same direction; the first positioning parts 12211 are clamped in the distance between the first coil ring 111 and the second coil ring 112; The first positioning member 12211 includes two first positioning blocks 122111 arranged back to each other; the two first positioning blocks 122111 respectively semi-encircle the first coil ring 111 and the second coil ring 112. It can be understood that there are multiple The first positioning member 12211 is arranged radially along the same direction, and is clamped in the distance between the first coil ring 111 and the second coil ring 112. The first positioning member 12211 includes two first positioning members 12211. Positioning block 122111. The first positioning block 122111 is similar to a "[" shape. The two first positioning blocks 122111 are arranged back to back. One of the first positioning blocks 122111 is half-encircled and clamped on the first coil ring 111. The other first positioning block 122111 is The block 122111 is half-encircled and clamped on the second coil ring 112. When the first coil ring 111 undergoes thermal expansion and contraction, the first positioning member 12211 can adjust the position between the first coil ring 111 and the second coil ring 112. The spacing between them is fixed. The same principle applies to the second positioning member 12221, which will not be described again here.

Optionally, the first positioning member 12211 and the second positioning member 12221 are spaced apart within the distance between the first coil ring 111 and the second coil ring 112, and the first positioning member 12211 and the second positioning member 12221 Adjacent settings. It can be understood that the first positioning member 12211 and the second positioning member 12221 are arranged side by side in the radial direction of the coil 11 , for example, within multiple intervals between the first coil ring 111 and the second coil ring 112 , the first positioning member 12211, the second positioning member 12221, the first positioning member 12211, and the second positioning member 12221 are arranged in sequence.

Advantageously, as shown in Figure 8, the first positioning component 1221 and the second positioning component 1222 are respectively located on both sides of the binding member 121 in the horizontal plane of the coil 11, specifically the first positioning member 12211 and the second positioning member. 12221 is close to the side of the tie member 121. The first positioning block 122111 and the second positioning block 122211 are both spot welded to the tie member 121, which is further conducive to keeping the spacing between the coils 11 fixed.

It is understandable that those skilled in the art can flexibly fix the pitch of the coil tubes 11 according to production needs and the selection of the material of the coil tubes 11. Inspired by the fact that this embodiment first proposes to fix the pitch of the coil tubes 11, any The means for fixing the distance between the coil tubes 11 are all within the limited scope of this embodiment, and other technical means will not be described in detail in this embodiment.

In some embodiments, the coil assembly 1 includes a plurality of air flow dispersing members 13 , one air flow dispersing member 13 is disposed above each coil 11 ; the air flow dispersing members 13 correspond to an "S" shape in the axial direction of the coil assembly 1 Structure, covering the "S" shaped structure.

Specifically, as shown in FIG. 5 , the airflow dispersion member 13 can be understood as any form of baffle. The advantageous airflow dispersion member 13 is connected to a plurality of tie-down members 121 respectively, which can be specifically understood as welding. The airflow dispersing member 13 corresponds to the "S"-shaped structure in the middle of each layer of coil 11 in the coil assembly 1 in the up-and-down direction, blocking the "S"-shaped structure to prevent hot airflow from being transmitted downward from the "S"-shaped structure. Creates a short circuit to the airflow for maximum heat recovery. The arrangement of the air flow dispersing member 13 allows the hot air flow to be dispersed as evenly as possible on each layer of coils 11, and the heat is exchanged sequentially from the upper coil 11 to the lower coil 11, while preventing the "S" shaped structure cavity from gathering hot air flow. role.

In some embodiments, the water-cooled wall tube set 4 includes a plurality of water-cooled wall tubes 41 , an outlet header 42 and an inlet header 43 ; wherein the plurality of water-cooled wall tubes 41 are arranged side by side along the casing 200 The axial direction is spirally coiled with equal pitch; each water wall tube 41 is provided with a second inlet guide pipe 411 and a second outlet guide pipe 412 at both ends; a plurality of second outlet guide pipes 412 are connected to the outlet manifold 42; a plurality of second outlet guide pipes 412 are connected to the outlet manifold 42; The inlet guide pipe 411 is connected to the inlet manifold 43 .

Specifically, as shown in Figures 3 and 4, a plurality of water-cooled wall tubes 41 are arranged side by side in the up and down direction. The end of the second inlet guide tube 411 is coiled inside the casing 200 in a spiral manner with equal pitch and is located in the coil assembly. 1’s outer circumference. The liquid inlet end of each water-cooled wall tube 41 is connected to the second inlet guide pipe 411, and the liquid outlet is connected to the second outlet guide pipe 412; a plurality of second outlet guide pipes 412 are respectively connected to the outlet manifold 42; a plurality of second inlets The guide pipes 411 are respectively connected to the inlet manifolds 43. The water-cooled wall tube group 4 can not only reduce the wall temperature of the shell 200°C, but also recover heat and produce a certain amount of saturated steam, and the water-cooled wall tubes 41 are all made of carbon steel or low alloy steel seamless steel tubes, which is a very good Energy-saving and consumption-reducing components are also a good way to save energy.

Advantageously, as shown in Figure 4, the highest points of the multiple water-cooled wall tubes 41 in the axial direction of the housing 200 are on the same plane. It can be understood that no matter how many water-cooled wall tubes 41 there are, try to ensure that the highest point of the water-cooled wall tubes 41 is A uniform reduction in wall temperature of the housing 200 is achieved in the same plane. Exemplarily, the water-cooled wall tube group 4 includes three water-cooled wall tubes 41, which are the first water-cooled wall tube, the second water-cooled wall tube and the third water-cooled wall tube from bottom to top; wherein the first water-cooled wall tube, the second water-cooled wall tube The water-cooled wall tube and the third water-cooled wall tube are simultaneously coiled inside the casing 200 in an equidistant spiral manner until they reach the top. In order to make the first water-cooled wall tube, the second water-cooled wall tube and the third water-cooled wall tube The highest point is on the same plane, and the third water-cooled wall tube first ends coiling and extends downward to connect with the outlet header 42; then the second water-cooled wall tube ends coiling and extends downward to connect with the outlet header 42, and finally the third water-cooled wall tube ends coiling and extends downward to connect with the outlet header 42. The wall tube ends coiling and extends downward to connect with the outlet header 42 . That is, the points where the first water-cooled wall tube, the second water-cooled wall tube, and the third water-cooled wall tube extend downward on the same plane at the highest points of the multiple water-cooled wall tubes are close to evenly distributed in the circumferential direction, which can effectively reduce the pressure of the shell in the same plane. The temperature difference on the body 200 thereby equalizes the wall temperature of the housing 200 and increases the service life of the housing 200. The above arrangement is an exemplary but non-limiting description.

In some embodiments, the heat exchange assembly 100 includes a casing 45; the casing 45 is disposed on the outer circumference of the coil assembly 1 and between the coil assembly 1 and the water wall tube set 4.

Specifically, as shown in Figure 1, a casing 45 is provided on the entire outer circumference of the coil assembly 1. The function of the casing 45 is to ensure that the hot air flow passes through each layer of coils 11 of the coil assembly 1. Pass from top to bottom in order to prevent air flow from short circuiting and allow the air flow to flow to the cylinder wall as little as possible, so as to maximize heat recovery and protect the cylinder wall.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations of the invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "examples," "embodiments," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials or features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present invention. The embodiments are subject to changes, modifications, substitutions and variations.

Claims (9)

1. An oxidation oven heat exchange assembly, the oxidation oven comprising a housing, wherein the heat exchange assembly comprises:

at least two coil assemblies, the two coil assemblies being disposed at different heights within the housing along an axial direction of the housing; and two coil assemblies are connected in parallel between the inlet header and the outlet header;

the coil assembly comprises a plurality of coils arranged along the axial direction of the coil assembly; two ends of the coil pipe are respectively connected with a first inlet guide pipe and a first outlet guide pipe; the first outlet leg of the upper layer of the coil corresponds to the first inlet leg of the lower layer of the coil in the axial direction of the coil assembly; the first inlet guide pipe is connected with the inlet header, and the first outlet guide pipe is connected with the outlet header;

in the horizontal plane of the coil pipe, the coil pipe is coiled from the first inlet leading pipe end to the inside in an equidistant spiral mode according to a first direction to form a plurality of first coil pipe coils with different coil diameters, and the coil pipe is bent into an S shape inside and then coiled from the inside to the outside in an equidistant spiral mode according to a second direction to form a plurality of second coil pipe coils with different coil diameters; the second coil pipe ring is positioned between two adjacent first coil pipe rings; wherein the first direction is opposite to the second direction; and

a water wall tube set; the water wall pipe group is circumferentially arranged in the shell and is clung to the oxidation furnace shell; and the water wall tube set is located at the outer circumference of the coil assembly.

2. The heat exchange assembly of claim 1 wherein said coil assembly includes a plurality of securing assemblies, one of said securing assemblies being disposed on each of said coils; the securing assembly includes a plurality of binders; the plurality of binding pieces are respectively arranged in the plane of the coil in a radial annular mode and are coated outside the coil to bind the coil.

3. The heat exchange assembly of claim 2, wherein the securing assembly comprises a positioning assembly comprising:

a plurality of first positioning assemblies; the plurality of first positioning components are respectively and radially distributed in the plane of the coil; the first positioning component comprises a plurality of first positioning elements which are radially distributed along the same direction; the first positioning piece is clamped in the interval between the first coil pipe ring and the second coil pipe ring; the first positioning piece comprises two first positioning blocks which are arranged in a back-to-back mode; the two first positioning blocks are respectively arranged on the first coil ring and the second coil ring in a semi-surrounding and clamping manner; and

a plurality of second positioning assemblies; the plurality of second positioning components are respectively and radially distributed in the plane of the coil; the second positioning component comprises a plurality of second positioning pieces which are radially distributed along the same direction; the second positioning piece is clamped in the interval between the first coil pipe ring and the second coil pipe ring; the second positioning piece comprises two second positioning blocks which are arranged in a back way; the two second positioning blocks are respectively arranged on the first coil ring and the second coil ring in a semi-surrounding and clamping manner;

the first positioning component and the second positioning component are respectively positioned at two sides of the binding piece in the horizontal plane of the coil pipe.

4. A heat exchange assembly according to claim 3 wherein the first and second locating members are each spaced apart within the space between the first and second coil loops and the first and second locating members are alternately disposed within the space formed by the first and second coil loops.

5. A heat exchange assembly according to any one of claims 1 to 3, wherein the coil assembly comprises a plurality of air flow splitters, one above each of the coils; the airflow dispersion member corresponds to the S-shaped structure in the axial direction of the coil assembly, and the airflow dispersion member shields the S-shaped structure.

6. A heat exchange assembly according to any one of claims 1 to 3 wherein the inlet header is provided with at least two orifice fittings; the two orifice joints are respectively connected with the two coil pipe assemblies.

7. A heat exchange assembly according to any one of claims 1 to 3 wherein the waterwall tube set comprises;

a plurality of waterwall tubes; the water wall pipes are arranged side by side and spirally wound along the axial direction of the shell at equal pitch; two ends of each water wall pipe are respectively provided with a second inlet guide pipe and a second outlet guide pipe;

an outlet header, said second outlet leg on each of said waterwall tubes being connected to said outlet header, respectively; and

and the second inlet guide pipes on each water wall pipe are respectively connected with the inlet collecting pipes.

8. The heat exchange assembly of claim 7 wherein the highest points of a plurality of said waterwall tubes in the axial direction of said housing are in the same plane.

9. The heat exchange assembly of claim 1 wherein the heat exchange assembly comprises a shroud; the protective cylinder is arranged on the outer circumference of the coil pipe assembly, and the protective cylinder is positioned between the coil pipe assembly and the water wall pipe group.