CN212227004U - Steam superheater - Google Patents
Steam superheater Download PDFInfo
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- CN212227004U CN212227004U CN202020425027.6U CN202020425027U CN212227004U CN 212227004 U CN212227004 U CN 212227004U CN 202020425027 U CN202020425027 U CN 202020425027U CN 212227004 U CN212227004 U CN 212227004U
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a steam superheater includes from bottom to top in proper order: the device comprises a radiation chamber, a convection chamber, an air preheater and a chimney, wherein an upper layer of furnace tubes and a lower layer of furnace tubes are arranged in the convection chamber, the lower layer of furnace tubes are arranged below the upper layer of furnace tubes, each furnace tube is a coiled tube, the upper layer of furnace tubes comprise 3-5 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned below; the lower furnace tube comprises 3-5 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned in the furnace body and is arranged downwards; the number of the furnace tubes in the convection chamber is equal to that of the furnace tubes in the lower layer, the furnace tubes are annularly arranged and are attached to the inner wall of the convection chamber, one end of each furnace tube in the convection chamber is connected with the outlet of each furnace tube in the lower layer, and the other end of each furnace tube penetrates through the side wall of the convection chamber and extends out of the convection chamber.
Description
Technical Field
The utility model belongs to the steam heating field, concretely relates to steam superheater.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
The steam superheater is one of key devices of styrene devices in plastic plants, and the conventional steam superheater is generally a double-pass furnace tube and provides a heat source for subsequent reactions after low-pressure steam is heated in two stages by a convection chamber and a radiation chamber. The treatment capacity of the existing steam superheater is 4 times of the original treatment capacity, two materials are difficult to heat simultaneously, if a double-pass furnace tube is continuously used for heating, the pipe diameter of the furnace tube is expanded to be twice of the original diameter, the wall thickness of the furnace tube is expanded to be about twice of the original wall thickness, so that the weight of the furnace tube is changed to be about 14 times of the original weight, and because the furnace tube system is overweight, the strength of a furnace tube hanger at the high temperature of 1000 ℃ cannot meet the requirement; meanwhile, the pipe diameter of the furnace pipe is changed to 4 times of the original pipe diameter, and the pipe spacing is correspondingly changed to 2 times of the original pipe spacing, so that the diameter of the furnace body is enlarged to two times of the original pipe diameter, and the project investment and the occupied area are greatly increased.
Disclosure of Invention
In order to solve the technical problems existing in the prior art, the utility model aims to provide a steam superheater.
In order to realize the purpose of the utility model, one or more embodiments of the utility model disclose the following technical solutions:
a steam superheater comprises the following components in sequence from bottom to top: a radiant chamber, a convection chamber, an air preheater, and a chimney, wherein,
an upper layer of furnace tubes and a lower layer of furnace tubes are arranged in the convection chamber, the lower layer of furnace tubes are arranged below the upper layer of furnace tubes, each furnace tube is a coiled tube, the upper layer of furnace tubes comprises 3-5 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned below; the lower furnace tube comprises 3-5 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned in the furnace body and is arranged downwards;
the number of the furnace tubes in the radiation chamber is equal to that of the furnace tubes in the lower layer, the furnace tubes are arranged in an annular shape and are attached to the inner wall of the radiation chamber, one end of each furnace tube in the radiation chamber is connected with the outlet of each furnace tube in the lower layer, and the other end of each furnace tube penetrates through the side wall of the radiation chamber and extends out of the radiation chamber.
Compared with the prior art, the utility model discloses an above one or more technical scheme have gained following beneficial effect:
the double tube passes in the steam superheater are replaced by the multiple tube passes, so that the steam treatment capacity of the steam superheater can be remarkably improved, and the problems that the diameter and the wall thickness of the furnace tube are too large and the hoisting strength of the furnace tube hanger cannot be met at high temperature due to the fact that the diameter of the furnace tube is expanded only by expanding the furnace tube are solved.
The plurality of the serpentine tubes in the upper and lower layers of the furnace tubes in the convection chamber are vertically arranged side by side, so that the volume of the furnace tubes can be obviously reduced, the utilization rate of space is improved, the installation of the multi-tube-pass furnace tubes can be realized on the premise of not increasing too many furnace body diameters, and the cost can be effectively reduced.
An upper layer furnace tube and a lower layer furnace tube are filled in the convection chamber, and the upper layer furnace tube is used for introducing clean materials, so that the clean materials can be heated to reach the temperature to be reacted, and the reaction efficiency of subsequent reaction is improved.
And low-temperature steam is introduced into the lower furnace tube, the convection chamber can be utilized to preheat the part of the low-temperature steam, the preheated steam enters the furnace tube in the radiation chamber and is further heated in the radiation chamber to form superheated steam.
Through setting up two-layer boiler tube about in convection chamber, can heat two kinds of materials simultaneously, further saved the space, improved the space of steam superheater and the utilization ratio of energy.
An air preheater is provided above the convection chamber to preheat the burner air to about 300 ℃, which reduces both the flue gas temperature and fuel consumption.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of a radiant chamber furnace tube system according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a convection chamber furnace tube system according to an embodiment of the present invention;
fig. 4 is a structural schematic diagram of the convection chamber and the convection chamber furnace tube system of the embodiment of the present invention.
The furnace comprises a furnace outer wall 1, a furnace outer wall 2, a lining 3, a steam furnace pipe system 4, a clean gas furnace pipe system 5, a burner 6, a chimney 7, an air preheater 8, a convection chamber 9, a radiation chamber 10, a radiation chamber furnace pipe inlet 11, a radiation chamber furnace pipe outlet 12, an upper layer furnace pipe 13 and a lower layer furnace pipe.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A steam superheater comprises the following components in sequence from bottom to top: a radiant chamber, a convection chamber, an air preheater, and a chimney, wherein,
an upper layer of furnace tubes and a lower layer of furnace tubes are arranged in the convection chamber, the lower layer of furnace tubes are arranged below the upper layer of furnace tubes, each furnace tube is a coiled tube, the upper layer of furnace tubes comprises 3-5 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned below; the lower furnace tube comprises 3-5 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned in the furnace body and is arranged downwards;
the number of the furnace tubes in the convection chamber is equal to that of the furnace tubes in the lower layer, the furnace tubes are annularly arranged and are attached to the inner wall of the convection chamber, one end of each furnace tube in the convection chamber is connected with the outlet of each furnace tube in the lower layer, and the other end of each furnace tube penetrates through the side wall of the convection chamber and extends out of the convection chamber.
Each furnace tube in the convection chamber and the radiation chamber is a coiled tube, which can effectively improve the length of the heating path of the fluid to realize the sufficient heating of the fluid.
The import of upper furnace tube and lower floor's boiler tube all is located the top, and the export is located the below because the below from steam superheater reduces to the upper temperature gradually, and when fluid inlet was located the top, can guarantee that the temperature that flows out after the heating is the highest, effectively improves heating efficiency.
The annular arrangement of boiler tube in the radiation chamber, and paste in the inner wall setting of radiation chamber, both can avoid the interference to the flame in the radiation chamber, can reduce boiler tube and flame direct contact again, play certain guard action to the boiler tube, simultaneously, the annular arrangement of boiler tube utilizes the radiant energy of flame to heat steam, can also guarantee the heating homogeneity of steam to guarantee steam temperature's homogeneity.
In some embodiments, the number of furnace tubes in the lower layer and the convection chamber are 4.
In some embodiments, a burner is provided at the bottom of the convection chamber, the burner being connected to a fuel source.
In some embodiments, the air preheater comprises a middle cavity, a fin assembly and a shell, wherein two ends of the middle cavity are respectively connected with the convection chamber and the chimney, the fin assembly is arranged around the cavity, the shell is arranged around the fin assembly and forms a closed space with the fin assembly, and an inlet and an outlet are arranged on the shell.
The flue gas temperature through convection current room is higher, carries more heat, when this part flue gas flows through air heater, lets in the air in to the space of shell, and the heat in the flue gas passes through the fin and transmits to the air in, retrieves the heat in the flue gas, preheats the air.
In some embodiments, the body of the steam superheater is comprised of an outer furnace wall and an inner liner.
Further, the material of the furnace outer wall is carbon steel, low alloy steel or stainless steel, preferably carbon steel or low alloy steel.
Furthermore, a reinforcing structure is arranged on the outer side of the outer furnace wall.
Furthermore, the lining is made of ceramic fibers, casting materials or refractory bricks.
Furthermore, the lining of the radiation section is made of ceramic fiber.
Furthermore, the inner linings of the convection section, the air preheater and the chimney are made of casting materials.
Example 1
As shown in fig. 1, 2, 3 and 4, a four-tube pass steam superheater sequentially comprises from bottom to top: a radiant chamber 9, a convection chamber 8, an air preheater 7 and a stack 6, wherein,
an upper layer furnace tube 12 and a lower layer furnace tube 13 are arranged in the convection chamber 8, the lower layer furnace tube 13 is arranged below the upper layer furnace tube 12, each furnace tube is a coiled tube, the upper layer furnace tube 12 comprises 4 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned below; the lower furnace tube comprises 4 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned in the furnace body and is arranged downwards;
the number of the furnace tubes in the radiation chamber 9 is equal to that of the furnace tubes in the lower layer 13, each furnace tube is annularly arranged and attached to the inner wall of the convection chamber 8, one end (namely, a furnace tube inlet 10 of the radiation chamber) of each furnace tube in the radiation chamber 9 is respectively connected with an outlet of each furnace tube in the lower layer 13, and the other end (namely, a furnace tube outlet 11 of the radiation chamber) penetrates through the side wall of the radiation chamber 9 and extends out of the radiation chamber 9.
The four-pass clean gas enters the furnace body at the upper part of the convection chamber 8 and is heated to the reaction temperature in the middle of the convection chamber 8 and then is discharged from the furnace body. The four-pass steam enters the furnace body in the middle of the convection chamber, is heated for the first time, enters the radiation chamber through the rearrangement of the four-pass furnace tubes in the lower part of the convection chamber, is continuously heated to the reaction temperature, and then is discharged from the furnace body. The two materials are sent to a pi-shaped reactor for mixed reaction after being discharged from the heating furnace.
The furnace body consists of an outer furnace wall 1 and an inner lining 2.
The material of the furnace outer wall 1 can be carbon steel, low alloy steel or various weldable materials such as stainless steel, and carbon steel or low alloy steel is preferably used. The outer wall of the furnace needs to be reinforced by a steel structure.
The lining can be made of ceramic fibers, castable, refractory bricks and the like, wherein the radiation section is preferably made of ceramic fiber modules, and the convection section, the air preheater and the chimney are preferably made of castable. The heat preservation thickness of each part needs to be calculated so as to ensure that the temperature of the outer wall of the furnace is less than or equal to 80 ℃.
The furnace tube system consists of a clean gas furnace tube system and a steam furnace tube system.
The clean gas furnace tube system is positioned in the convection section, and the four-pass furnace tubes are respectively wound for 12 times through 180-degree elbows and then heated to the reaction temperature and then discharged out of the furnace body.
The clean gas furnace tube system can be made of high temperature resistant furnace tubes such as S31008, Inconel600, etc., preferably S31008, and the wall thickness of the furnace tubes needs to be checked.
The steam furnace pipe system is positioned in the convection section and the radiation section, the four-pass furnace pipes are respectively wound for 6 times through 180-degree elbows in the convection chamber, and then are rearranged at the lower part of the convection chamber for entering the radiation chamber through the four-pass furnace pipes, are wound for 10 times through the 180-degree elbows, and are heated to the reaction temperature and then are discharged out of the furnace body.
The material of the steam furnace pipe system can be Inconel600, 2848W5 and other high temperature resistant furnace pipes, preferably 2848W5, and the wall thickness of the furnace pipes needs to be checked.
The combustor uses a low NOx combustor produced by a professional combustor manufacturer, and the combusted flue gas can be directly discharged to the atmosphere through a chimney. The burner is arranged on the bottom of the furnace.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A steam superheater is characterized in that: comprises the following components from bottom to top in sequence: a radiant chamber, a convection chamber, an air preheater, and a chimney, wherein,
an upper layer of furnace tubes and a lower layer of furnace tubes are arranged in the convection chamber, the lower layer of furnace tubes are arranged below the upper layer of furnace tubes, each furnace tube is a coiled tube, the upper layer of furnace tubes comprises 3-5 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned below; the lower furnace tube comprises 3-5 coiled tubes which are vertically arranged side by side, the inlet of each coiled tube is positioned above, and the outlet of each coiled tube is positioned in the furnace body and is arranged downwards;
the number of the furnace tubes in the radiation chamber is equal to that of the furnace tubes in the lower layer, the furnace tubes are arranged in an annular shape and are attached to the inner wall of the radiation chamber, one end of each furnace tube in the radiation chamber is connected with the outlet of each furnace tube in the lower layer, and the other end of each furnace tube penetrates through the side wall of the radiation chamber and extends out of the radiation chamber.
2. The steam superheater according to claim 1, wherein: the number of the furnace tubes in the lower layer and the convection chamber is 4.
3. The steam superheater according to claim 1, wherein: the bottom of the convection chamber is provided with a burner which is connected with a fuel source.
4. The steam superheater according to claim 1, wherein: the air preheater comprises a cavity in the middle, a fin assembly and a shell, wherein two ends of the cavity in the middle are respectively connected with the convection chamber and the chimney, the fin assembly is arranged around the cavity, the shell is arranged around the fin assembly and forms a closed space with the fin assembly, and an inlet and an outlet are formed in the shell.
5. The steam superheater according to claim 1, wherein: the furnace body of the steam superheater consists of an outer wall and an inner lining.
6. The steam superheater according to claim 5, wherein: the material of the outer wall of the furnace is carbon steel, low alloy steel or stainless steel.
7. The steam superheater according to claim 6, wherein: the material of the outer wall of the furnace is carbon steel or low alloy steel.
8. The steam superheater according to claim 6, wherein: the outer side of the furnace outer wall is provided with a reinforcing structure.
9. The steam superheater according to claim 5, wherein: the lining is made of ceramic fiber, casting material or refractory bricks.
10. A steam superheater as claimed in claim 9, wherein: the lining of the radiation section is made of ceramic fiber.
11. A steam superheater as claimed in claim 9, wherein: the inner linings of the convection section, the air preheater and the chimney are made of casting materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020425027.6U CN212227004U (en) | 2020-03-27 | 2020-03-27 | Steam superheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020425027.6U CN212227004U (en) | 2020-03-27 | 2020-03-27 | Steam superheater |
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| Publication Number | Publication Date |
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| CN212227004U true CN212227004U (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020425027.6U Active CN212227004U (en) | 2020-03-27 | 2020-03-27 | Steam superheater |
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| CN (1) | CN212227004U (en) |
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- 2020-03-27 CN CN202020425027.6U patent/CN212227004U/en active Active
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