CN213505991U

CN213505991U - Water-cooled wall tube group of ammonia oxidation furnace for nitric acid production

Info

Publication number: CN213505991U
Application number: CN202021595171.0U
Authority: CN
Inventors: 桂州; 谢强
Original assignee: Sichuan Jiuyuan Machinery Manufacturing Co ltd
Current assignee: Sichuan Jiuyuan Machinery Manufacturing Co ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-06-22
Anticipated expiration: 2030-08-04

Abstract

The utility model relates to a water-cooling wall nest of tubes of ammoxidation furnace is used in nitric acid production includes wall nest of tubes body (1) at least, the shape of wall nest of tubes body (1) can be injectd by the inner wall of hypomere casing (3) that have the ammoxidation furnace of setting for the volume, just wall nest of tubes body (1) is according to hugging closely the ammoxidation furnace the mode setting of hypomere casing (3) inner wall is in on casing (3) inner wall, wherein, wall nest of tubes body (1) adopts and has the cover of laminating of open-ended annular wall pipe ground hypomere casing (3) inner wall for the cooling water that gets into wall nest of tubes body (1) flows out after can flowing through whole internal face. The wall temperature of the shell of the ammonia oxidation furnace can be effectively reduced by arranging the water-cooled wall tube group covering the shell of the ammonia oxidation furnace, the service life of the shell is prolonged, heat energy can be converted to produce saturated steam, and the coil is made of carbon steel, so that the production cost is low, and the ammonia oxidation furnace is a good energy-saving and consumption-reducing component.

Description

Water-cooled wall tube group of ammonia oxidation furnace for nitric acid production

Technical Field

The utility model relates to the field of chemical nitric acid production equipment, in particular to a water-cooled wall tube group of an ammonia oxidation furnace for nitric acid production.

Background

In order to reduce the temperature of the inner wall of the shell in the production process of the ammonia oxidation furnace for producing nitric acid by the existing normal pressure method, a heat insulation layer is usually arranged on the inner wall of the shell, the heat insulation layer is a heat insulation material of a lining, so that the cooling effect is not obvious, and the heat absorbed by the heat insulation material cannot be utilized, thereby causing waste.

Chinese patent CN207307840U discloses chemical industry equipment for nitrate production, including heating preheating case and agitator tank, preheating case upper end is equipped with the feed inlet, and preheating case right side is connected with the heating chamber through the connecting pipe, and preheating case lower extreme is equipped with the connecting pipe, and the connecting pipe lower extreme is connected with logical medical kit, the inside stirring frame that is equipped with of agitator tank is equipped with the insulating layer on the agitator tank inner wall, and the insulating layer left and right sides is equipped with left side blast pipe and right side blast pipe, and left side blast pipe lower extreme is connected with left side heating plywood, and left side heating plywood lower extreme is connected with left side heating device through the connecting pipe, and right side blast pipe lower extreme is connected with right side heating plywood, and right side heating device left side is equipped with the heating cabinet, and the. Although this patent has higher production efficiency, its box is inside to be in under a higher temperature condition, can not carry out effectual cooling according to the demand, has the ultra-temperature to lead to the structure to take place the erosion and loss easily, greatly reduced the life of device.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor studied a lot of documents and patents when making the present invention, but the space did not list all details and contents in detail, however, this is by no means the present invention does not possess these prior art features, but on the contrary the present invention has possessed all features of the prior art, and the applicant reserves the right to increase the related prior art in the background art.

SUMMERY OF THE UTILITY MODEL

To the deficiency of the prior art, the utility model provides a water-cooling wall nest of tubes of ammoxidation stove is used in nitric acid production includes the wall nest of tubes body at least, the shape of wall nest of tubes body can be injectd by the inner wall of the hypomere casing that has the ammoxidation stove of setting for the volume, the wall nest of tubes body is embedded into according to the mode of hugging closely the hypomere shells inner wall of ammoxidation stove in the casing, wherein, the wall nest of tubes body covers according to the laminating hypomere shells inner wall's mode makes the wall nest of tubes body can shelter from the lateral wall of the hypomere casing of ammoxidation stove.

According to a preferred embodiment, the wall tube group main body is formed by a plurality of sets of parallel-arranged coils that are arranged in such a manner as to be aligned with the inner wall of the ammonia oxidation furnace and to be wound around, wherein the coils are arranged in an S-turn manner on the lower casing, and the wall tube group main body formed by the plurality of sets of coils can completely cover the side wall of the lower casing.

According to a preferred embodiment, the coil pipe is further connected with an inlet guide pipe and an outlet guide pipe, wherein a plurality of sets of inlet guide pipes penetrate through the lower section shell in a mutually parallel manner and on the cross section of the same lower section shell, and the inlet guide pipes are further detachably connected with inlet headers arranged outside the wall pipe set body.

According to a preferred embodiment, a plurality of sets of outlet leads extend through the lower shell in parallel and on the same cross-section of the lower shell, and the outlet leads are also detachably connected to outlet headers arranged outside the body of the wall tube set.

According to a preferred embodiment, the inlet manifold comprises a first L-shaped elbow and a water inlet connector, which are communicated with each other, and one end of the first L-shaped elbow, which is far away from the water inlet connector, is detachably connected with the inlet guide pipe; it is same the connector of intaking can be connected with a plurality ofly simultaneously first L type return bend.

According to a preferred embodiment, the outlet header is internally provided with a second L-shaped bent pipe and a water outlet connector which are communicated with each other, and one end of the second L-shaped bent pipe, which is far away from the water outlet connector, is detachably connected with the outlet guide pipe; it is same the water connector can be connected with a plurality ofly simultaneously second L type return bend.

According to a preferred embodiment, first L type return bend is connected the one end of water inlet connector is buckled to the direction that is close to ammonia oxidation furnace bottom, second L type return bend is connected the one end of water outlet connector is buckled to the direction of keeping away from ammonia oxidation furnace bottom, realizes the import collector with the export collector extends towards different directions.

According to a preferred embodiment, the coils arranged in parallel at least comprise a first coil, a second coil, a third coil, a fourth coil and a fifth coil, and the coil ports are bent to make multiple groups of the coil ports on the same horizontal plane, wherein the water inlet port connected with the inlet leading pipe is bent on the axis of the first coil close to the bottom of the ammonia oxidation furnace, and the water outlet port connected with the outlet leading pipe is bent on the axis of the fifth coil far away from the bottom of the ammonia oxidation furnace.

According to a preferred embodiment, the coil is confined by the internal space of the ammoxidation furnace, and the coil is wound in a non-closed loop in a rotary manner to form a cylindrical wall structure.

According to a preferred embodiment, under the condition that the body of the wall tube group adopts the cross section positions of the inlet guide tube and the outlet guide tube as boundary marks, the coil tube close to one end of the inlet guide tube adopts flat steel to weld the gaps between the tubes; and the coil pipe close to one end of the outlet guide pipe is welded between pipes by adopting round steel.

The utility model has the advantages of: the water-cooling wall pipe group that can cover the lower extreme shells inner wall of ammoxidation stove through the setting can effectual absorption ammoxidation stove during operation heat, and simultaneously, the high-temperature gas that produces in the casing passes through the water-cooling wall pipe group back temperature and descends, the casing wall temperature of effectual reduction ammoxidation stove, make casing wall temperature control within the operating temperature that shell material allowwed, extension casing life, can convert heat energy again and produce saturated steam, supply other equipment to use, and the coil pipe is the carbon steel and makes, and the production cost is not high, be a fine energy saving and consumption reduction part, and has very high practicality.

Drawings

FIG. 1 is a schematic structural view of a preferred embodiment of a water-cooled wall tube bank of an ammoxidation furnace for producing nitric acid according to the present invention;

FIG. 2 is a schematic view of a preferred partial structure of a water-cooled wall tube group of an ammoxidation furnace for producing nitric acid according to the present invention in the view angle A;

FIG. 3 is a schematic view of a preferred partial structure of a water-cooled wall tube group of an ammoxidation furnace for producing nitric acid according to the present invention in the B view direction;

FIG. 4 is a schematic sectional view showing the preferred C-C position of the water wall tube group of the ammonia oxidation furnace for producing nitric acid according to the present invention.

List of reference numerals

1: wall tube group body 2: coil pipe 3: lower shell

4: inlet header 5: outlet header 6: flat steel

7; round steel 21, inlet guide pipe 22 and outlet guide pipe

23: a first coil 24: a second coil 25: a third coil

26: a fourth coil pipe 27: a fifth coil pipe 41: a first L-shaped bent pipe

42: water inlet connector 51: second L-bend 52: water outlet connector

Detailed Description

The following detailed description is made with reference to fig. 1 to 4.

Example 1

Fig. 1 shows a water-cooled wall tube bank of an ammoxidation furnace for producing nitric acid, the apparatus comprising a wall tube bank body 1, an inlet header 4 and an outlet header 5.

According to a particular embodiment, the wall group body 1 is made up of five groups of coils 2. The water inlet ports of the five groups of coil pipes 2 are detachably connected with the same inlet header 4. The water outlet ports of the five groups of coil pipes 2 are also detachably connected with an outlet header pipe 5. After cooling water flowing in from an inlet header 4 can flow through the coil pipe 2 which completely covers the side wall of the lower shell 3 of the whole ammonia oxidation furnace, the temperature of the cooling water can reach about 250 ℃, and the cooling water is sent to a steam drum to be flashed into saturated steam under the high-temperature state. The wall temperature of the lower shell 3 of the ammonia oxidation furnace can be reduced by arranging the water-cooled wall tube group, the service life of the lower shell is prolonged, and saturated steam can be produced by converting heat energy and used by subsequent process equipment.

Preferably, the shape of the wall tube block body 1 can be defined by the inner wall of the lower shell 3 of the ammoxidation furnace having a set volume. The wall tube block body 1 is arranged on the side wall of the lower shell 3 in a manner of being tightly attached to the side wall of the lower shell 1 of the ammonia oxidation furnace. The wall tube group body 1 adopts an annular wall tube with an opening to be attached and cover the side wall of the lower section shell 3, so that the wall tube group body 1 can shield the whole side wall of the lower section shell 1 of the ammonia oxidation furnace. The wall tube group body 1 is formed by a plurality of groups of coil tubes 2 which are arranged in parallel in a spiral mode around the inner wall of the ammonia oxidation furnace. The coil pipe 2 is arranged on the lower shell 3 in an S-shaped bending and rotating way. The coil pipe 2 is bent according to the limit of the ammonia oxidation furnace, when the seamless steel pipe forming the coil pipe 2 is bent into a closed loop, only the steel pipe is bent back, so that the bending direction of the steel pipe is changed, the steel pipe is bent anticlockwise from the beginning, the bending direction of the steel pipe is changed when the circular ring-shaped annular pipe is to be realized continuously, and a cylindrical pipe coil pipe structure with a smooth steel pipe flowing surface is formed. The coil pipes are arranged in a spiral mode, so that the wall pipe group body 1 consisting of a plurality of groups of coil pipes 2 can completely cover the side wall of the lower section shell 3. The coil pipe 2 which can be bent and arranged in an S shape is adopted to form the wall pipe group body 2, so that the coil pipe 2 can cover the whole lower section shell 3 which is in a hollow cylinder wall shape according to a surrounding and overlapping mode. Specifically, the coil pipe 2 is bent from an initial position to be close to the inner wall, and when the coil pipe 2 is bent in an arc shape to reach a shell wall position just opposite to the initial position along the central axis of the lower section shell 3. The opposite wall position can be extended as a parallel line parallel to the axis of the lower housing 3 so that the coil 2 does not form a helical closed loop but a hollow cylindrical wall structure with an opening dividing the entire side wall during the continuous folding and stacking process. So that the wall pipe can better cover the whole side wall of the lower shell 3. Preferably, the outer diameter of the wall tube block body 1 having a hollow cylindrical shape is phi 3530 mm. Preferably, the wall tube block body 1 is placed and supported by a ring plate arranged on the inner wall of the lower shell 3 of the ammoxidation furnace.

Preferably, an inlet lead 21 and an outlet lead 22 are also connected to the coil 2. The 5 groups of inlet guide pipes 21 correspond to the five groups of coil pipes 2 and penetrate through the lower shell 3 in a manner of being parallel to each other and being positioned on the cross section of the same lower shell 3. The inlet lead-in 21 is also detachably connected to the inlet header 4 arranged outside the wall tube block body 1. The 5 sets of outlet leads 22 extend through the lower housing 3 in parallel and on the same cross-section of the lower housing 3. The outlet lead-through 22 is also detachably connected to an outlet header 5 arranged outside the wall tube block body 1.

Preferably, the inlet header 4 includes a first L-bend 41 and a water inlet connection 42 that are in internal communication with each other. The end of the first L-bend 41 remote from the water inlet connection 42 is detachably connected to the inlet lead 21. The water inlet connector 42 is provided with 5 connectors uniformly distributed on the same surface, and the same water inlet connector 42 is simultaneously connected with a plurality of first L-shaped bent pipes 41 through the 5 connectors. A second L-shaped elbow 51 and a water outlet connector 52 which are communicated with each other inside the outlet header 5. The end of the second L-bend 51 remote from the outlet connection 52 is detachably connected to the outlet lead 22. A plurality of second L-bends 51 can be connected to the same outlet connector 52. The end of the first L-shaped bent pipe 41 connected with the water inlet connector 42 is bent towards the direction close to the bottom of the ammonia oxidation furnace, the end of the second L-shaped bent pipe 51 connected with the water outlet connector 52 is bent towards the direction far away from the bottom of the ammonia oxidation furnace, and the end parts, far away from the coil 2, of the inlet manifold 4 and the outlet manifold 5 extend towards different directions. Through setting up L type return bend for the opening of import header 4 and the opening of export header 5 are located opposite direction just, and the differentiation of discerning when being favorable to the use is also conveniently carried out erection joint input water source and output storage device simultaneously.

Preferably, the coils 2 arranged in parallel to each other further comprise a first coil 23, a second coil 24, a third coil 25, a fourth coil 26 and a fifth coil 27. The ports of the coil pipes 2 are bent in a way that the ports of a plurality of groups of coil pipes 2 are on the same horizontal plane. The water inlet ports of the second coil 24, the third coil 25, the fourth coil 26 and the fifth coil 27 connected with the inlet guide pipe 21 are bent towards the axis of the first coil 2 close to the bottom of the ammonia oxidation furnace. Through the arrangement mode, the water inlet ports of the 5 groups of the coil pipes 2 are positioned on the same central axis of the coil pipes. The water outlet ports of the first coil 23, the second coil 24, the third coil 25 and the fourth coil 26 connected with the outlet guide pipe 22 are bent towards the axis of the fifth coil 2 far away from the bottom of the ammonia oxidation furnace. Preferably, the coil 2 is formed by bending a seamless steel pipe.

Preferably, the wall tube block body 1 uses the opening position of the inlet guide tube 21 and the outlet guide tube 22 connecting the coil 2 as the boundary position of the whole wall tube block body 1. Namely, the area position of five rows of annular coil pipes formed by the water inlets and the water outlets of the five groups of coil pipes 2 is used as a boundary position. When the wall pipe group is put into the ammonia oxidation furnace, the coil pipe 2 which is close to the bottom of the ammonia oxidation furnace and is close to one end of the first coil pipe 23 connected with the inlet guide pipe 21 adopts flat steel 3 to weld the gaps between the pipes; the coil 2 which is far away from the bottom of the ammonia oxidation furnace and is close to one end of the fifth coil 27 connected with the outlet guide pipe 22 adopts round steel 7 to weld the pipes.

For the convenience of understanding, the working principle and the using method of the water wall tube group of the ammonia oxidation furnace for producing nitric acid of the invention are discussed.

The application relates to a water-cooled wall tube bank of an ammoxidation furnace for nitric acid production. The inlet header is first connected to a source of cooling water while the outlet header is connected to the saturated steam demand equipment. At the start of production, the flow of cooling water in the water wall tube group provided inside the shell starts as the temperature in the ammonia oxidation furnace rises. As the cooling water is injected and flows, the bank of waterwalls begins to absorb the thermal energy inside the shell. When high-temperature gas generated by reaction in the ammonia oxidation furnace passes through the water-cooled wall tube group, the high-temperature gas and cooling water in the water-cooled wall tube group are subjected to heat transfer, so that the water temperature in the coil tube reaches about 250 ℃, ammonia oxidation furnace equipment is led out, and the high-temperature cooling water conveyed out of the water-cooled wall tube group can be conveyed into a steam drum to be flashed into saturated steam for use by subsequent process equipment. The wall temperature of the lower shell 3 of the ammonia oxidation furnace can be reduced by arranging the water-cooled wall tube group, the service life of the lower shell is prolonged, and saturated steam can be produced by converting heat energy and used by subsequent process equipment.

It should be noted that the above-mentioned embodiments are exemplary, and those skilled in the art can devise various solutions in light of the present disclosure, which are also within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present specification and drawings are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. A water wall tube bank of an ammonia oxidation furnace for producing nitric acid, at least comprising a wall tube bank body (1), wherein the shape of the wall tube bank body (1) can be limited by the inner wall of a lower shell (3) of the ammonia oxidation furnace with a set volume, and the method is characterized in that the wall tube bank body (1) is embedded into the lower shell (3) of the ammonia oxidation furnace in a manner of being tightly attached to the inner wall of the lower shell (3), wherein the wall tube bank body (1) can shield the side wall of the lower shell (3) of the ammonia oxidation furnace in a manner of being tightly attached to cover the inner wall of the lower shell (3),

under the condition that the cross section positions of an inlet guide pipe (21) and an outlet guide pipe (22) are adopted as boundary marks in the wall pipe group body (1), a coil pipe (2) close to one end of the inlet guide pipe (21) is welded with a gap between pipes by adopting flat steel (6); the coil pipe (2) close to one end of the outlet guide pipe (22) adopts round steel (7) to weld the pipes,

one end of the first L-shaped bent pipe (41) connected with the water inlet connector (42) is bent towards the direction close to the bottom of the ammonia oxidation furnace, one end of the second L-shaped bent pipe (51) connected with the water outlet connector (52) is bent towards the direction far away from the bottom of the ammonia oxidation furnace, and the inlet manifold (4) and the outlet manifold (5) extend towards different directions.

2. The water-cooled wall tube bank of an ammoxidation furnace for producing nitric acid according to claim 1, wherein said wall tube bank body (1) is formed by a plurality of coils (2) arranged in parallel so as to be wound in conformity with the inner wall of the ammoxidation furnace, wherein said coils (2) are arranged in said lower shell (3) in such a manner as to be wound in an S-turn, whereby said wall tube bank body (1) formed by said plurality of coils (2) can completely cover the side wall of the lower shell (3).

3. A waterwall tube bank of an ammoxidation furnace for producing nitric acid in accordance with claim 2 wherein said coil (2) is further connected with an inlet lead (21) and an outlet lead (22), wherein a plurality of sets of said inlet leads (21) are passed through said lower shell (3) in parallel and on the same cross section of said lower shell (3), said inlet leads (21) being further detachably connected with an inlet header (4) provided outside said wall bank body (1).

4. A waterwall tube bank of an ammoxidation furnace for producing nitric acid in accordance with claim 3, wherein a plurality of said outlet leads (22) are passed through said lower shell (3) in parallel with each other and on the same cross section of said lower shell (3), said outlet leads (22) being further detachably connected to outlet headers (5) provided outside said wall bank body (1).

5. The water-cooled wall tube bank of an ammoxidation furnace for producing nitric acid in accordance with claim 4, wherein said inlet header (4) comprises a first L-shaped elbow (41) and a water inlet connector (42) which are connected to each other inside, and wherein an end of said first L-shaped elbow (41) remote from said water inlet connector (42) is detachably connected to said inlet lead (21); the same water inlet connector (42) can be simultaneously connected with a plurality of first L-shaped bent pipes (41).

6. The water-cooled wall tube bank of an ammoxidation furnace for producing nitric acid in accordance with claim 5, wherein said outlet header (5) has a second L-shaped elbow (51) and a water outlet connection head (52) communicating with each other inside thereof, and wherein an end of said second L-shaped elbow (51) remote from said water outlet connection head (52) is detachably connected to said outlet lead tube (22); the same water outlet connector (52) can be simultaneously connected with a plurality of second L-shaped bent pipes (51).

7. A bank of waterwall tubes of an ammoxidation furnace for producing nitric acid according to claim 6 wherein said coils (2) disposed in parallel to each other comprise at least a first coil (23), a second coil (24), a third coil (25), a fourth coil (26) and a fifth coil (27), the ports of the coil pipes (2) are bent to ensure that the ports of a plurality of groups of the coil pipes (2) are positioned on the same horizontal plane, wherein the water inlet ports of the second coil pipe (24), the third coil pipe (25), the fourth coil pipe (26) and the fifth coil pipe (27) which are connected with the inlet guide pipe (21) are bent towards the axis of the first coil pipe (23) close to the bottom of the ammonia oxidation furnace, and the water outlet ports of the first coil pipe (23), the second coil pipe (24), the third coil pipe (25) and the fourth coil pipe (26) which are connected with the outlet guide pipe (22) are bent towards the axis of the fifth coil pipe (27) far away from the bottom of the ammonia oxidation furnace.

8. The water-cooled wall tube bank of an ammoxidation furnace for producing nitric acid according to claim 7, wherein said coil (2) is formed into a cylindrical wall structure by being wound in a non-closed loop manner while being rotated in such a manner that said coil (2) is confined by the inner space of the ammoxidation furnace.