CN114370772B - Oxidation furnace heat exchange assembly - Google Patents
Oxidation furnace heat exchange assembly Download PDFInfo
- Publication number
- CN114370772B CN114370772B CN202111564430.2A CN202111564430A CN114370772B CN 114370772 B CN114370772 B CN 114370772B CN 202111564430 A CN202111564430 A CN 202111564430A CN 114370772 B CN114370772 B CN 114370772B
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- positioning
- assembly
- heat exchange
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- 230000003647 oxidation Effects 0.000 title claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 25
- 230000000712 assembly Effects 0.000 claims abstract description 30
- 238000000429 assembly Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- 239000011230 binding agent Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000011295 pitch Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
- C01B21/28—Apparatus
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/38—Nitric acid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
- F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/0018—Cooling of furnaces the cooling medium passing through a pattern of tubes
- F27D2009/0021—Cooling of furnaces the cooling medium passing through a pattern of tubes with the parallel tube parts close to each other, e.g. a serpentine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
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
Technical Field
The invention relates to the technical field of nitric acid production equipment, in particular to a heat exchange component of an oxidation furnace.
Background
The oxidation furnace is a key device in nitric acid production, and proper temperature is needed in the oxidation furnace to maintain continuous operation of the reaction, and meanwhile, the temperature of a furnace wall must be effectively controlled, so that the service life of the device is shortened and even the device is damaged at an excessive temperature.
In the prior art, in order to realize the utilization of heat in an oxidation furnace, a heat recovery device is arranged in the oxidation furnace; providing a water wall assembly for preventing the equipment from being damaged by excessive temperature; the coil pipe assembly is a horizontal coil pipe formed by coiling seamless pipes in an equidistant spiral mode, the coiling number and the coiling method of each layer of coil pipe are the same, each two layers of coil pipes are provided with a first inlet guide pipe and a first inlet guide pipe, and the absorbed heat is different according to the installation position of each layer of coil pipe in an ammoxidation furnace and the different high temperature temperatures of each layer of coil pipe. For example, CN201857267U proposes a coil assembly, each layer is a horizontal coil formed by winding seamless tubes in an equidistant spiral manner, and different numbers of inlet guide tubes and first outlet guide tubes are respectively drawn out from each layer of coil, so that the heat exchange efficiency is improved to a certain extent, but the coils of each layer in the coil assembly are ordered in disorder, difficult to overhaul and difficult to manufacture, so that the heat exchange cost is increased and the heat exchange management is inconvenient. Meanwhile, as the ammoxidation furnace is used, the temperature of coils at different layers of distribution positions is different, the horizontal coils at the same layer cannot always keep equidistant coiling, so that uneven heat exchange is caused, and the heat exchange efficiency is reduced.
It is therefore a technical hurdle to be solved by those skilled in the art how to provide an oxidation furnace heat exchange assembly for efficiently recovering heat generated by the combustion reaction of an ammoxidation furnace and reducing the impact of high temperatures on the safety and reliability of the ammoxidation furnace.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the related art to a certain extent, and provides a heat exchange component of an oxidation furnace, which ensures that high-temperature gas is uniformly distributed in sequence and passes downwards in sequence; the high-temperature gas is discharged after heat exchange from top to bottom and enters a post-process, and the heat exchange component in the embodiment of the invention can recover heat energy and reduce the influence of high temperature on the safety and reliability of the ammonia oxidation furnace.
In view of the foregoing, embodiments of the present invention provide an oxidation oven heat exchange assembly, the oxidation oven including a housing, the heat exchange assembly comprising: at least two coil assemblies and a waterwall tube set; the two coil pipe assemblies are arranged at different heights in the shell along the axial direction of the shell; 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;
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.
In some embodiments, the coil assembly includes a plurality of securing assemblies, one for each of the 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.
In some embodiments, the securing assembly includes 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 opposite to the first coil and the second coil; and
a plurality of second positioning assemblies; the second positioning assemblies are radially distributed in the circumferential plane of the coil pipe respectively; 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.
In some embodiments, the first and second positioning members are each disposed at intervals within a space between the first coil and the second coil, and the first and second positioning members are alternately disposed within the space formed by the first coil and the second coil.
In some embodiments, the coil assembly includes 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.
In some embodiments, the inlet header has at least two orifice fittings disposed thereon; the two orifice joints are respectively connected with the two coil pipe assemblies.
In some embodiments, the waterwall tube set comprises a plurality of waterwall tubes, an outlet header and an inlet header; the water wall pipes are arranged side by side, and the water wall pipes are spirally wound along the axial direction of the shell at equal pitches; two ends of each water wall pipe are respectively provided with a second inlet guide pipe and a second outlet guide pipe; the second outlet guide pipe on each water wall pipe is respectively connected with the outlet collecting pipe; the second inlet guide pipe on each water wall pipe is respectively connected with the inlet collecting pipe.
In some embodiments, the highest points of the plurality of water wall tubes in the axial direction of the housing are on the same plane.
In some embodiments, 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.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a heat exchange assembly of an oxidation oven according to an embodiment of the present invention.
Fig. 2 is a top view of a coil assembly according to one embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a water wall set according to an embodiment of the present invention.
FIG. 4 is a schematic view of an expanded structure of a water wall tube according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a coil pipe according to an embodiment of the present invention.
Fig. 6 is a schematic view of another coil disposed below the coil of fig. 5.
Fig. 7 is a schematic cross-sectional view of a coil according to an embodiment of the present invention.
Fig. 8 is a top view of fig. 7.
Reference numerals
A heat exchange assembly 100; housing 200
A coil assembly 1;
a coil 11;
a first coil 111; a second coil 112; a first inlet lead 113; a first outlet lead 114;
a securing assembly 12;
a binder 121;
a positioning assembly 122; a first positioning component 1221; a first positioning member 12211; a first positioning block 122111; a second positioning assembly 1222; a second positioning member 12221; a second positioning block 122211;
an airflow dispersing member 13;
an inlet header 2;
an outlet header 3;
a water wall tube group 4;
a waterwall tube 41; a second inlet lead 411; a second outlet lead 412;
an outlet header 42;
an inlet header 43;
and a casing 45.
Detailed Description
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
in the related art, the oxidation furnace includes a housing, wherein the coil pipe assembly includes at least two groups, and two coil pipe assemblies are disposed in an axial direction of the housing, wherein the axial direction of the coil pipe assembly coincides with the axial direction of the housing. The two coil assemblies are respectively a coil assembly of the evaporation section and a coil assembly of the superheating section. The coil pipe assembly comprises a plurality of horizontal coil pipes which are arranged in parallel in the axial direction of the shell, wherein the horizontal coil pipes are coiled and manufactured in a plane in an equidistant spiral mode.
For ease of understanding, the axial direction of the housing in this embodiment coincides with the up-down direction, and the radial direction coincides with the left-right direction, as particularly shown in fig. 1.
In the related art, the first inlet guide pipes and the first outlet guide pipes with different numbers are respectively extracted from each layer of horizontal coil pipes, and the heat exchange efficiency is improved to a certain extent, but the coil pipes in each layer of the coil pipe assembly are ordered in disorder, so that the overhaul and the manufacturing process are difficult, the heat exchange cost is increased, and the heat exchange management is inconvenient. Meanwhile, as the ammoxidation furnace is used, the temperature of each layer of discs with different distribution positions is different, the horizontal coil pipes of the same layer cannot always keep equidistant coiling, so that uneven heat exchange is caused, and the heat exchange efficiency is reduced. Therefore, how to provide a compact and regular heat exchange assembly of an oxidation furnace for efficiently recovering heat generated by a combustion reaction of an ammoxidation furnace, so as to save energy consumption and reduce the influence of high temperature on the safety and reliability of the ammoxidation furnace is a technical problem to be solved by those skilled in the art.
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
Example 1
As shown in fig. 1 to 8, an embodiment of the present invention provides a heat exchange assembly 100 for an oxidation oven, the oxidation oven including a housing 200, the heat exchange assembly 100 including: at least two coil assemblies 1 and a waterwall tube set 4; wherein the two coil assemblies 1 are arranged at different heights in the housing 200 along the axial direction of the coil assemblies 1, and the two coil assemblies 1 are connected in parallel between the inlet header 2 and the outlet header 3;
the coil assembly 1 comprises a plurality of coils 11 arranged in the axial direction of the coil assembly 1; the two ends of the coil pipe 11 are respectively connected with a first inlet guide pipe 113 and a first outlet guide pipe 114; the first outlet lead 114 of the upper coil 11 corresponds to the first inlet lead 113 of the lower coil 11 in the axial direction of the coil assembly 1; the first inlet lead 113 is connected with the inlet header 2, and the first outlet lead 114 is connected with the outlet header 3;
in the horizontal plane of the coil pipe 11, the coil pipe 11 is coiled from outside to inside in an equidistant spiral manner from the end of the first inlet guide pipe 113 according to a first direction to form a plurality of first coil pipes 111 with different diameters, and the coil pipe 11 is bent into an S shape inside and then coiled from inside to outside in an equidistant spiral manner according to a second direction to form a plurality of second coil pipes 112 with different diameters; wherein the second coil 112 is located between two adjacent first coils 111; wherein the first direction is opposite to the second direction;
the water wall pipe group 4 is circumferentially arranged inside the shell 200 and is tightly attached to the oxidation furnace shell 200; and the water wall tube set 4 is located at 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 with the up-down direction, and the horizontal plane inner radial direction of the coil 11 coincides with the left-right direction, specifically as shown in fig. 1.
As shown in fig. 1, the heat exchange assembly 100 is disposed inside a shell 200 of the oxidation furnace, wherein the heat exchange assembly 100 comprises at least two coil assemblies 1 and a water wall tube set 4, and the water wall tube set 4 is circumferentially disposed inside the shell 200 and is located at the outer circumference of the coil assemblies 1; at least two coil units 1 are juxtaposed in the up-down direction inside the housing 200.
Wherein the coil assembly 1 of the evaporator section and the coil assembly 1 of the superheater section each include a plurality of coils 11 juxtaposed in the up-down direction as shown in fig. 1-2 and 5-6. Wherein, the two ends of the coil 11 are respectively provided with a first inlet guide pipe 113 and a first outlet guide pipe 114, i.e. the inlet end of the coil 11 is connected with the first inlet guide pipe 113, and the inlet end and the outlet end of the coil 11 are connected with the first outlet guide pipe 114. The coil 11 is coiled from the inlet end in a first direction (clockwise or anticlockwise) in an equidistant helical manner from the outside to the inside to form a plurality of first coil turns 111 with different diameters; the coil 11 is internally bent into an S shape and then coiled from inside to outside in an equidistant spiral manner according to a second direction to form a plurality of second coil turns 112 with different coil diameters, and the second coil turns 112 are positioned between two adjacent first coil turns 111, as shown in fig. 5.
It is understood that when the first direction is clockwise, the second direction is counterclockwise; when the first direction is anticlockwise coiling, the second direction is clockwise coiling. The first coil rings 111 are sequentially arranged from outside to inside in the horizontal plane of the coil 11 with the same interval, but the diameter of the coils is reduced from large to small; similarly, the second coil turns 112 are arranged in sequence from inside to outside in the horizontal plane of the coil 11 at the same interval, but the diameters of the turns are increased from small. The second coil 112 is located between two adjacent first coils 111 at the same distance as the left and right adjacent first coils 111. It will be appreciated that the first inlet lead 113 is located at the outermost periphery of the first coil 111 and the first outlet lead 114 is located at the outermost periphery of the second coil 112.
It should be noted that, in the actual manufacturing process, the coil 11 in this embodiment may be formed by spirally winding at equal pitches in the same plane, or may be formed by splicing and assembling a plurality of circular arcs or semicircular lines. It will be appreciated that the temperature to which each layer of coil 11 is subjected will vary with the height of the installation and the amount of heat absorbed, and that the pitch of the spirals of the coils 11 of different layers may vary.
It will be appreciated that the first outlet lead 114 of the upper coil 11 corresponds to the first inlet lead 113 of the lower coil 11 in the up-down direction, as shown in fig. 5 and 6, to facilitate the assembled connection of the upper coil 11 to the lower coil 11.
It is advantageous to combine the coils 11 to further cope with the different mounting heights of the layers of coils 11 and the different temperatures to which they are subjected. Illustratively, to improve heat exchange efficiency and increase the service life of the coil assembly 1, in some coils 11 subjected to higher temperatures in the coil assembly 1, each layer of coils 11 is connected to the inlet header 2 by an inlet connection pipe using a first inlet lead 113, and the first outlet lead 114 is connected to the outlet header 3 by an outlet connection pipe, so as to realize one liquid inlet end and one liquid outlet end of one layer of coils 11; of the coils 11 of the coil assembly 1 which are subjected to lower temperature, two layers of coils 11 can be used as a group, and in particular, fig. 5 is an upper layer of coils 11, fig. 6 is a lower layer of coils, and a first inlet guide tube 113 of the upper layer of coils 11 is connected with an inlet header 2 through an inlet connecting tube; the first outlet lead 114 of the upper coil 11 is connected with the first inlet lead 113 of the lower coil 11; the first outlet lead 114 of the lower coil 11 is connected to the outlet header 3 by an outlet connection pipe, so as to realize one liquid inlet end and one liquid outlet end of the two-layer coil, and similarly, it can be known that when the coil assembly 1 is subjected to a very low temperature, one liquid inlet end and one liquid outlet end of the three-layer or even multi-layer coil 11 are referred to above. The above arrangements are illustrative and not limiting, and the arrangement of the particular coil 11 can be flexibly combined by those skilled in the art according to actual needs.
When two layers of coils 11 are formed into a group, the upper layer of coils 11 are wound from the outside to the inside in an equidistant spiral manner clockwise from the inlet end to form a plurality of first coils 111 with different diameters; and the upper layer coil 11 is bent into an S shape inside and then coiled from inside to outside in an equidistant spiral mode anticlockwise to form a plurality of second coil rings 112 with different diameters, and the second coil rings 112 are positioned between two adjacent first coil rings 111. The first outlet guide pipe 114 of the upper coil 11 corresponds to the first inlet guide pipe 113 of the lower coil 11 in the up-down direction, and the upper coil 11 and the lower coil 11 are assembled and connected; the lower layer coil 11 is coiled from outside to inside in an equidistant spiral manner from the inlet end to form a plurality of first coil rings 111 with different diameters, and the lower layer coil 11 is bent into an S shape inside and then coiled from inside to outside in an equidistant spiral manner clockwise to form a plurality of second coil rings 112 with different diameters, wherein the second coil rings 112 are positioned between two adjacent first coil rings 111. I.e. when the upper and lower coils 11 are to be connected, the lower coil 11 is wound in the opposite direction to the upper coil 11.
Wherein, the inlet header 2 is provided with at least two orifice joints; one orifice joint is connected with a coil pipe component of the evaporation section; the other orifice fitting connects the coil assembly 1 of the superheater section. Wherein two orifice fittings enable the coil assembly 1 of the evaporator end to be different from the amount of water in the coil assembly 1 of the superheater end.
In some embodiments, the coil assembly 1 includes a plurality of securing assemblies 12, one securing assembly 12 being provided on each coil 11; the securing assembly 12 includes a plurality of binders 121; the plurality of binding members 121 are respectively arranged radially and annularly in the horizontal plane of the coil 11, and are wrapped outside the coil 11 to bind the coil 11.
In particular, as shown in fig. 6-8, the binder 121 is understood to be a flat bar that is radially disposed annularly about the outside of the coil 11 in the plane of the coil 11. A person skilled in the art can arrange a plurality of flat steel bars according to practical situations, for example, when 4 flat steel bars are arranged, the interval between the flat steel bars is 90 degrees; the person skilled in the art can also arrange 6 or 8 flat bars, etc. The binding piece 121 is annularly coated outside the coil 11, binds the middle part and the edge of the coil 11, fixes the innermost coil 11 and the outermost coil 11 of the coil 11, and prevents the coil 11 from being deformed along with the extension of production time, namely, the distance between the innermost coil 11 and the outermost coil 11 of the coil 11 in the same plane is increased, so that uneven heat exchange is caused, and the heat exchange efficiency is reduced.
Further, the fixed assembly 12 includes a positioning assembly 122, and the positioning assembly 122 includes a plurality of first positioning assemblies 1221 and a plurality of second positioning assemblies 1222: the plurality of first positioning assemblies 1221 are uniformly distributed in the circumferential plane of the coil 11, respectively; the first positioning assembly 1221 includes a plurality of first positioning members 12211 radially disposed in the same orientation; the first positioning piece 12211 is clamped in the interval between the first coil 111 and the second coil 112; the first positioning member 12211 includes two first positioning blocks 122111 disposed opposite; the first positioning block 122111 is arranged to semi-surround and clamp the first coil 111 and the second coil 112 respectively; the plurality of second positioning assemblies 1222 are uniformly distributed in the circumferential plane of the coil 11, respectively; the second positioning assembly 1222 includes a plurality of second positioning members 12221 radially disposed in the same orientation; the second positioning piece 12221 is clamped in the interval between the first coil 111 and the second coil 112; the second positioning piece 12221 includes two second positioning pieces 122211 disposed opposite to each other; the second positioning block 122211 is respectively arranged to semi-surround and clamp the first coil 111 and the second coil 112;
the first positioning assembly 1221 and the second positioning assembly 1222 are positioned on opposite sides of the binder 121 in the horizontal plane of the coil 11.
As shown in fig. 7 and 8, the first positioning assembly 1221 and the second positioning assembly 1222 are uniformly disposed on a circumferential plane of the coil 11, and it is understood that the first positioning assembly 1221 and the second positioning assembly 1222 are uniformly disposed circumferentially.
Wherein the first positioning assembly 1221 includes a plurality of first positioning members 12211 radially disposed in the same orientation; the first positioning piece 12211 is clamped in the interval between the first coil 111 and the second coil 112; the first positioning member 12211 includes two first positioning blocks 122111 disposed opposite; the two first positioning blocks 122111 are respectively and semi-surrounding and clamping the first coil 111 and the second coil 112, a plurality of understandable first positioning pieces 12211 are radially arranged along the same direction, the first positioning pieces 12211 are clamped in the space between the first coil 111 and the second coil 112, the first positioning pieces 12211 comprise two first positioning blocks 122111, the first positioning blocks 122111 are similar to a shape of a '[', the two first positioning blocks 122111 are arranged back to back, one first positioning block 122111 is semi-surrounding and clamping on the first coil 111, the other first positioning block 122111 is semi-surrounding and clamping on the second coil 112, and when the first coil 111 is subjected to thermal expansion and cold shrinkage, the first positioning pieces 12211 can fix the space between the first coil 111 and the second coil 112. Similarly, the second positioning member 12221 may be omitted herein.
Alternatively, the first positioning member 12211 and the second positioning member 12221 are each disposed at an interval within a space between the first coil 111 and the second coil 112, and the first positioning member 12211 and the second positioning member 12221 are disposed adjacently. It will be appreciated that the first positioning member 12211 and the second positioning member 12221 are disposed side by side in sequence in the radial direction of the coil 11, for example, the first positioning member 12211, the second positioning member 12221, the first positioning member 12211, and the second positioning member 12221 are disposed in sequence in a plurality of intervals between the first coil 111 and the second coil 112.
Advantageously, as shown in fig. 8, the first positioning component 1221 and the second positioning component 1222 are respectively located at two sides of the binding member 121 in the horizontal plane of the coil 11, and the first positioning member 12211 and the second positioning member 12221 are specifically located at one side of the binding member 121, where the first positioning block 122111 and the second positioning block 122211 are both spot-welded with the binding member 121, which is further beneficial to keeping the space between the coils 11 fixed.
It will be appreciated that those skilled in the art can flexibly fix the spacing of the coils 11 according to the production requirements and the choice of materials for the coils 11, and any means for fixing the spacing of the coils 11 is within the scope of the present embodiment, and other technical means will not be described in detail in this embodiment, under the first teaching of the present embodiment to fix the pitch of the coils 11.
In some embodiments, the coil assembly 1 includes a plurality of airflow splitters 13, one airflow splitter 13 being disposed above each coil 11; the airflow dispersing member 13 corresponds to the "S" shaped structure in the axial direction of the coil assembly 1, and shields the "S" shaped structure.
As shown in particular in fig. 5, the air flow distributing member 13 may be understood as any form of baffle, and the air flow distributing member 13 may advantageously be connected to a plurality of binding members 121, respectively, and may be understood as welding in particular. The airflow dispersing piece 13 corresponds to the S-shaped structure in the middle of each layer of coil 11 in the coil assembly 1 in the up-down direction, shields the S-shaped structure, and prevents the hot airflow from being conveyed downwards from the S-shaped structure to form an airflow short circuit so as to recover heat to the maximum extent. The airflow dispersing members 13 are arranged to uniformly disperse the airflow on each layer of coil 11 as much as possible, and exchange heat sequentially from the upper layer of coil 11 to the lower layer of coil 11, and prevent the cavity of the S-shaped structure from gathering the airflow.
In some embodiments, waterwall tube set 4 includes a plurality of waterwall tubes 41, an outlet header 42, and an inlet header 43; wherein a plurality of water wall tubes 41, in which the plurality of water wall tubes 41 are arranged side by side, are spirally wound with a uniform pitch along the axial direction of the housing 200; a second inlet guide pipe 411 and a second outlet guide pipe 412 are respectively arranged at two ends of each water wall pipe 41; a plurality of second outlet legs 412 connect to the outlet header 42; a plurality of second inlet legs 411 are connected to inlet header 43.
As shown in fig. 3 to 4, a plurality of water wall tubes 41 are arranged side by side in the up-down direction, and are wound inside the housing 200 in a spiral rising manner with a uniform pitch by the second inlet lead 411 end and are located at the outer circumference of the coil assembly 1. Wherein the liquid inlet end of each water wall tube 41 is connected with a second inlet guide tube 411, and the liquid outlet end is connected with a second outlet guide tube 412; a plurality of second outlet legs 412 are each connected to the outlet header 42; the plurality of second inlet legs 411 are connected to the inlet header 43, respectively. The water wall pipe set 4 can reduce the wall temperature of the shell 200 and recover heat to produce a certain amount of saturated steam, and the water wall pipes 41 are all made of carbon steel or low alloy steel seamless steel pipes, so that the water wall pipe set is a good energy-saving and consumption-reducing component and a good energy-saving method.
Advantageously, the highest points of the plurality of waterwall tubes 41 in the axial direction of the housing 200 are on the same plane as shown in fig. 4, and it is understood that the highest points of the waterwall tubes 41 are ensured to uniformly reduce the wall temperature of the housing 200 in the same plane as much as possible regardless of the number of the waterwall tubes 41. Illustratively, the waterwall tube set 4 includes three waterwall tubes 41, a first waterwall tube, a second waterwall tube, and a third waterwall tube in that order from bottom to top; wherein the first water wall pipe, the second water wall pipe and the third water wall pipe are simultaneously coiled inside the shell 200 in an equidistant spiral rising manner until reaching the uppermost, and the third water wall pipe is coiled at first and extends downwards to be connected with the outlet header 42 so that the highest points of the first water wall pipe, the second water wall pipe and the third water wall pipe are on the same plane; the second water wall tube then ends up coiled and extends downwardly for connection to the outlet header 42, and finally the third water wall tube ends up coiled and extends downwardly for connection to the outlet header 42. That is, the points of the first water wall pipe, the second water wall pipe and the third water wall pipe extending downwards on the same plane of the highest points of the water wall pipes are distributed evenly close to the circumferential direction, so that the temperature difference on the shell 200 in the same plane can be effectively reduced, the wall temperature of the shell 200 is uniform, and the service life of the shell 200 is prolonged. The above arrangement is illustrative but not limiting.
In some embodiments, heat exchange assembly 100 includes a shroud 45; a casing 45 is provided on the outer circumference of the coil assembly 1 between the coil assembly 1 and the waterwall tube set 4.
Specifically, as shown in fig. 1, a protective cylinder 45 is disposed on the entire outer circumference of the coil assembly 1, and the protective cylinder 45 is used for ensuring that the hot air flows through the coils 11 of each layer of the coil assembly 1 to the greatest extent from top to bottom, preventing the short circuit of the air flow and enabling the air flow to the cylinder wall as little as possible, so as to recover the heat to the greatest extent and protect the cylinder wall.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "embodiments," or "some examples" and the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, one skilled in the art can combine and combine the different embodiments or examples described in this specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111564430.2A CN114370772B (en) | 2021-12-20 | 2021-12-20 | Oxidation furnace heat exchange assembly |
| PCT/CN2022/140168 WO2023116648A1 (en) | 2021-12-20 | 2022-12-19 | Ammoxidation reactor and method for producing nitric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111564430.2A CN114370772B (en) | 2021-12-20 | 2021-12-20 | Oxidation furnace heat exchange assembly |
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| CN114370772A CN114370772A (en) | 2022-04-19 |
| CN114370772B true CN114370772B (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111564430.2A Active CN114370772B (en) | 2021-12-20 | 2021-12-20 | Oxidation furnace heat exchange assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023116648A1 (en) * | 2021-12-20 | 2023-06-29 | 赛鼎工程有限公司 | Ammoxidation reactor and method for producing nitric acid |
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| CN213505991U (en) * | 2020-08-04 | 2021-06-22 | 四川久源机械制造有限公司 | Water-cooled wall tube group of ammonia oxidation furnace for nitric acid production |
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2021
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|---|---|---|---|---|
| CN2564974Y (en) * | 2002-08-09 | 2003-08-06 | 黄钟平 | Coil pipe combined structure of heat storage ice storage tank |
| CN201857267U (en) * | 2010-09-27 | 2011-06-08 | 四川久源机械制造有限公司 | Coil pipe group for oxidation furnace annually producing three hundred thousand tons of nitric acid |
| CN102424370A (en) * | 2011-09-26 | 2012-04-25 | 四川久源机械制造有限公司 | Oxidation furnace used for production of nitric acid by using dual-pressure process and capable of outputting 360,000 tons of nitric acid annually |
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| CN114370772A (en) | 2022-04-19 |
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