Ammonia gas catalytic converter

Abstract

The utility model discloses an ammonia gas catalytic converter, which comprises an outer pipe, an inner pipe and an inner pipe, wherein the outer pipe is arranged inside an outer shell; the heating piece is arranged on the outer wall of the outer pipe; an air inlet cavity and an air outlet cavity are formed in the sealing end cover, and the outer end of the outer pipe is in threaded connection with the air outlet cavity; the two ends of the inner pipe are open, the outer end of the inner pipe is in threaded connection with the air inlet cavity, the inner pipe extends into the outer pipe, an air guide gap used for containing a catalyst is formed between the outer wall of the inner pipe and the inner wall of the outer pipe, and the air guide gap is communicated with the air outlet cavity; the air outlet pipe is formed on the surface of the sealing end cover and is communicated with the air outlet cavity; the air inlet pipe is formed on the side face of the sealing end cover and communicated with the air inlet cavity. According to the scheme, the catalyst arranged on the outer wall of the inner pipe can be conveniently replaced, and the replacement operation is simple and convenient; in the replacement process, the inner pipe and the outer pipe are coaxially arranged, local compression of the catalyst is avoided, uniform distribution of the catalyst is guaranteed, full contact of gas and the catalyst is guaranteed, and the catalytic conversion effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to atmospheric ammonia content measurement technical field, concretely relates to a kind of ammonia gas catalytic reformer. BACKGROUND

[0002] Chemiluminescence technology measures atmospheric ammonia content, mainly NH3(ammonia) in air is converted into NO by catalytic conversion, then the converted gas is introduced into nitrogen oxides analyzer based on the principle of chemiluminescence spectroscopy, and the NH3 concentration is obtained by difference method. The measurement system uses a double-channel gas alternation type into the nitrogen oxides analyzer. Since the same set of ozone generator, gas reaction chamber and PMT detector and other devices are used, the system structure is simplified, and the comparability and reliability of the measurement data are improved.

[0003] NH3 is catalytically converted into NO by ammonia gas catalytic reformer. After long-term use of ammonia gas catalytic reformer, the internal catalyst needs to be replaced. However, the current ammonia gas catalytic reformer is not convenient for catalyst replacement, and during catalyst replacement, the catalyst is easily locally compressed, affecting the uniformity of catalyst distribution and thus affecting the catalytic conversion effect. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of ammonia gas catalytic reformer, by the thread connection of outer tube and outlet cavity, remove the connection of sealing end cover and outer tube and extract inner tube from outer tube, it is convenient to replace the catalyst arranged on the outer wall of inner tube, and replacement operation is simple and convenient;And during replacement process, inner tube and outer tube are coaxially arranged, which will not cause local compression of catalyst, can ensure uniform distribution of catalyst, ensure the contact effect of gas and catalyst, so as to ensure catalytic conversion effect.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] The utility model provides a kind of ammonia gas catalytic reformer, comprising:

[0007] The outer tube is arranged in the outer shell, the sealing end of the outer tube is located in the outer shell, and the open end of the outer tube is located outside the outer shell.

[0008] The heating element is arranged on the outer wall of the outer tube, and the heating element is located in the outer shell.

[0009] The sealing end cover is provided with an inlet cavity and an outlet cavity inside, the inlet cavity and the outlet cavity are coaxial and connected, the inner diameter of the outlet cavity is greater than that of the inlet cavity, the outlet cavity port penetrates the side surface of the sealing end cover, and the outer end of the outer tube is threadedly connected with the outlet cavity.

[0010] An inner tube, the inner tube is open at both ends, the outer end of the inner tube is screwed with the air inlet cavity, the inner tube extends into the inner part of the outer tube, and the outer wall of the inner tube and the inner wall of the outer tube form an air guide gap for accommodating the catalyst, the air guide gap is communicated with the air outlet cavity;

[0011] An air outlet pipe formed on the surface of the sealing end cover, the air outlet pipe is communicated with the air outlet cavity;

[0012] An air inlet pipe formed on the side of the sealing end cover, the air inlet pipe is communicated with the air inlet cavity.

[0013] Optionally, the ammonia gas catalytic converter further comprises:

[0014] A heat preservation sleeve is sleeved on the outside of the outer tube and the heating element, and the heat preservation sleeve is located in the inside of the outer shell.

[0015] Optionally, the outer shell comprises:

[0016] A lower shell and an upper shell are butt-jointed to form a complete outer shell;

[0017] The same side of the lower shell and the upper shell is respectively provided with a first half hole and a second half hole, and the first half hole and the second half hole are butt-jointed to form a circular hole for accommodating and fixing the outer tube;

[0018] The outer side of the lower shell and the upper shell is respectively provided with a first connecting block and a second connecting block, and the first connecting block and the second connecting block are connected through a threaded nut.

[0019] Optionally, the inner wall of the lower shell and the upper shell is respectively provided with a first arc-shaped plate and a second arc-shaped plate, and the first arc-shaped plate and the second arc-shaped plate are butt-jointed to form a positioning sleeve pipe, and the sealing end of the outer tube is inserted and matched with the positioning sleeve pipe.

[0020] Optionally, the outer wall of the outer tube is provided with a limiting block, and the limiting block is provided with two limiting blocks, and the two limiting blocks are respectively abutted with the inner wall of the lower shell provided with the first half hole and the inner wall of the upper shell provided with the second half hole.

[0021] Optionally, the inner wall of the first half hole and the inner wall of the second half hole are respectively provided with a limiting groove corresponding to the limiting block, and the two limiting blocks are respectively inserted into the corresponding limiting grooves.

[0022] Optionally, the inner wall of the lower shell away from the first half hole is provided with a wire slot.

[0023] Optionally, the sealing end of the outer tube is provided with a connecting cavity;

[0024] A cover is screwed in the connecting cavity.

[0025] The inner wall of the cover is provided with a positioning cone which is inserted into the inner tube, and the taper surface of the positioning cone is in abutment with the inner wall of the inner tube;

[0026] The taper surface of the positioning cone is provided with a gas guide groove which is in communication with the inner cavity of the inner tube and the gas guide gap;

[0027] The gas guide groove is provided with a plurality of gas guide grooves which are uniformly distributed in the circumference based on the axis of the positioning cone.

[0028] Optionally, the outer end of the outer tube is formed with a first threaded pipe, a first limiting surface is formed between the first threaded pipe and the outer end of the outer tube, the first threaded pipe is threadedly connected with the gas outlet cavity, and the first limiting surface is in abutment with the side surface of the sealing end cover.

[0029] Optionally, the outer end of the inner tube is formed with a second threaded pipe, a second limiting surface is formed between the second threaded pipe and the outer end of the inner tube, the second threaded pipe is threadedly connected with the gas inlet cavity, and the second limiting surface is in abutment with the inner wall between the gas inlet cavity and the gas outlet cavity.

[0030] The above scheme of the utility model has at least the following beneficial effects:

[0031] The above scheme of the utility model has at least the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the three-dimensional structure of the ammonia gas catalytic conversion furnace provided by the embodiment of the utility model;

[0033] Figure 2 is a front view of the ammonia gas catalytic conversion furnace provided by the embodiment of the utility model;

[0034] Figure 3 is a schematic diagram of the connection structure of the sealing end cover, the outer tube and the inner tube in the ammonia gas catalytic conversion furnace provided by the embodiment of the utility model;

[0035] Figure 4 is Figure 2 the A part of the enlarged schematic diagram;

[0036] Figure 5 is Figure 2 the B part of the enlarged schematic diagram.

[0037] Reference signs are explained as follows:

[0038] 1, outer shell; 11, lower shell; 111, first arc-shaped plate; 12, upper shell; 121, second arc-shaped plate; 13, first connecting block; 14, second connecting block; 15, first half hole; 16, second half hole; 17, limiting groove; 18, threading groove; 2, outer pipe; 21, first threaded pipe; 22, first limiting surface; 23, limiting block; 24, connecting cavity; 25, cover body; 26, positioning cone; 27, air guiding gap; 3, sealing end cover; 31, air inlet cavity; 32, air outlet cavity; 4, air inlet pipe; 5, air outlet pipe; 6, inner pipe; 61, second threaded pipe; 62, second limiting surface; 7, heating element; 8, air guiding gap; 9, heat preservation and insulation sleeve. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0040] As Figures 1-5 shown, the utility model provides a kind of ammonia catalytic reformer, comprising:

[0041] Outer pipe 2 is arranged in the outer shell 1, and the sealing end of the outer pipe 2 is located in the outer shell 1, and the open end of the outer pipe 2 is located outside the outer shell 1;

[0042] Heating element 7 is arranged on the outer wall of the outer pipe 2, and the heating element 7 is located in the outer shell 1;

[0043] Sealing end cover 3, sealing end cover 3 is provided with air inlet cavity 31 and air outlet cavity 32 in the inside, air inlet cavity 31 is coaxial with air outlet cavity 32 and is communicated, the inner diameter of air outlet cavity 32 is greater than the inner diameter of air inlet cavity 31, the port of air outlet cavity 32 penetrates the side of sealing end cover 3, and the outer end of outer pipe 2 is connected with air outlet cavity 32 by screw thread;

[0044] Inner pipe 6, the both ends of inner pipe 6 are open, the outer end of inner pipe 6 is connected with air inlet cavity 31 by screw thread, inner pipe 6 extends into the inside of outer pipe 2, and the outer wall of inner pipe 6 and the inner wall of outer pipe 2 form air guiding gap 8 for accommodating catalyst between them, and air guiding gap 8 is communicated with air outlet cavity 32;

[0045] Air outlet pipe 5 is formed on the surface of sealing end cover 3, and air outlet pipe 5 is communicated with air outlet cavity 32;

[0046] Air inlet pipe 4 is formed on the side of sealing end cover 3, and air inlet pipe 4 is communicated with air inlet cavity 31.

[0047] In this embodiment, when catalytic conversion is carried out, the gas to be converted is injected through the gas inlet pipe 4, and the gas to be converted enters the gas guide gap 8 through the inner cavity of the inner pipe 6, and the gas to be converted is in full contact with the catalyst in the gas guide gap 8, and under the heating action of the heating element 7, NH3 in the gas to be converted is converted into NO, and NO is finally discharged from the gas outlet pipe 5; the gas to be converted can be in full contact with the catalyst, and the catalytic conversion effect is ensured;

[0048] When the catalyst needs to be replaced, the sealing end cover 3 is screwed, the connection between the gas outlet cavity 32 in the sealing end cover 3 and the outer pipe 2 is removed, the inner pipe 6 is pulled out from the outer cavity of the outer pipe 2 through the sealing end cover 3, the catalyst on the outer wall of the outer pipe 2 is removed, the new catalyst is wrapped and fixed on the outer wall of the inner pipe 6, the sealing end cover 3 is held by hand, the inner pipe 6 is inserted into the inner pipe 2, until the outer pipe 2 contacts with the gas outlet cavity 32, the sealing end cover 3 is screwed, the threaded connection between the outer pipe 2 and the gas outlet cavity 32 is realized, and the replacement of the catalyst is completed. The whole replacement operation is simple and convenient; during the replacement process, the inner pipe 6 and the outer pipe 2 are coaxially arranged, so that the catalyst will not be locally pressed, the uniform distribution of the catalyst can be ensured, the contact effect of the gas and the catalyst can be ensured, and the catalytic conversion effect is ensured;

[0049] In this embodiment, the outer pipe 2 and the inner pipe 6 can be quartz pipes. Since ammonia has adhesion, the outer pipe 2 and the inner pipe 6 are quartz pipes, which can reduce the adhesion rate of ammonia on the outer pipe 2 and the inner pipe 6, and help to improve the subsequent detection accuracy;

[0050] The gap between the inner wall of the outer pipe 2 and the outer wall of the inner pipe 6 is less than 1.5mm, which can make the ammonia fully contact with the catalyst and ensure the catalytic conversion effect;

[0051] The heating element 7 can be a heating belt, and a thermocouple can also be arranged on the outer wall of the outer pipe 2 to ensure the heating temperature.

[0052] As shown in Figure 2 In an optional embodiment of the utility model, the ammonia catalytic conversion furnace further comprises:

[0053] The heat preservation and insulation sleeve 9 is sleeved outside the outer pipe 2 and the heating element 7, and the heat preservation and insulation sleeve 9 is located inside the outer shell 1.

[0054] In this embodiment, the heat preservation and insulation sleeve 9 can reduce heat loss, ensure heating effect, and save energy;

[0055] The heat preservation and insulation sleeve 9 can be made of mullite.

[0056] As shown in Figure 1 , Figure 2 and Figure 4As shown in the optional embodiment of the utility model, the outer shell body 1 includes:

[0057] The lower shell 11 and the upper shell 12 are connected to form the complete outer shell body 1.

[0058] The same side of the lower shell 11 and the upper shell 12 is respectively provided with a first half hole 15 and a second half hole 16, and the first half hole 15 and the second half hole 16 are connected to form a circular hole for accommodating the fixed outer pipe 2.

[0059] The outer side of the lower shell 11 and the upper shell 12 is respectively provided with a first connecting block 13 and a second connecting block 14, and the first connecting block 13 and the second connecting block 14 are connected through a threaded nut.

[0060] In this embodiment, the first connecting block 13 and the second connecting block 14 are connected through the threaded nut, which facilitates the disassembly and assembly of the lower shell 11 and the upper shell 12, thereby facilitating the detection and maintenance of the components inside the outer shell body 1.

[0061] As shown in the optional embodiment of the utility model, Figure 2 and Figure 5 As shown in the optional embodiment of the utility model, the inner wall of the lower shell 11 and the upper shell 12 is respectively provided with a first arc-shaped plate 111 and a second arc-shaped plate 121, and the first arc-shaped plate 111 and the second arc-shaped plate 121 are connected to form a positioning sleeve, and the sealing end of the outer pipe 2 is inserted and matched with the positioning sleeve.

[0062] In this embodiment, the positioning sleeve formed by the abutment of the first arc-shaped plate 111 and the second arc-shaped plate 121 limits and supports the sealing end of the outer pipe 2, which can improve the stability of the outer pipe 2, thereby helping to ensure that the outer pipe 2 and the inner pipe 6 are in a coaxial state, ensuring that the catalyst is uniformly and fully distributed in the gas guiding gap 8, so that the to-be-converted gas can fully contact with the catalyst, and the catalytic conversion effect is ensured.

[0063] As shown in the optional embodiment of the utility model, Figure 4 As shown in the optional embodiment of the utility model, the outer wall of the outer pipe 2 is provided with a limiting block 23, and the limiting block 23 is provided with two blocks, and the two limiting blocks 23 respectively abut with the inner wall of the lower shell 11 provided with the first half hole 15 and the inner wall of the upper shell 12 provided with the second half hole 16.

[0064] In this embodiment, the limiting block 23 can be provided to position the outer pipe 2 in the axial direction, avoid the outer pipe 2 from moving along the axial direction, ensure the stability of the outer pipe 2, thereby ensuring the stability of the heating element 7, ensuring normal heating, and ultimately ensuring the catalytic conversion effect.

[0065] As shown in the optional embodiment of the utility model, Figure 4As shown, in an optional embodiment of the present invention, the inner walls of the first half-hole 15 and the second half-hole 16 are provided with limiting grooves 17, the limiting grooves 17 correspond to the limiting blocks 23, and the two limiting blocks 23 are respectively inserted into the corresponding limiting grooves 17.

[0066] In this embodiment, the limiting block 23 and the limiting groove 17 can be used to position the outer tube 2 in the circumferential direction, prevent the outer tube 2 from rotating and moving, ensure the stability of the outer tube 2, thereby ensuring the stability of the heating element 7, ensuring that heating proceeds normally, and ultimately ensuring the catalytic conversion effect.

[0067] like Figure 2 As shown, in an optional embodiment of the present invention, a wire groove 18 is provided through the inner wall of the lower shell 11 away from the first half hole 15.

[0068] In this embodiment, by providing the wire groove 18, it is easy to realize the electrical connection of the heating element 7 and ensure that the heating element 7 heats normally.

[0069] like Figure 5 As shown, in an optional embodiment of the present invention, the sealing end of the outer tube 2 is provided with a connecting cavity 24;

[0070] The connecting cavity 24 is internally threaded with a cover 25;

[0071] The inner wall of the cover 25 is provided with a positioning cone 26, which is inserted into the interior of the inner tube 6, and the cone surface of the positioning cone 26 abuts against the inner wall of the inner tube 6.

[0072] The cone surface of the positioning cone 26 is provided with an air guide groove 27, which connects the inner cavity of the inner tube 6 and the air guide gap 8.

[0073] Multiple air guide grooves 27 are provided, and the multiple air guide grooves 27 are evenly distributed around the axis of the positioning cone 26.

[0074] In this embodiment, the positioning cone 26 can provide auxiliary positioning support for the inner end of the inner tube 6, thereby ensuring that the inner tube 6 and the outer tube 2 are accurately in a coaxial state, and ensuring that the catalyst is evenly and fully distributed in the gas guide gap 8, so that the gas to be converted can fully contact the catalyst and ensure the catalytic conversion effect.

[0075] By setting a gas guide groove 27 on the conical surface of the positioning cone 26, the gas to be converted can enter the gas guide gap 8 through the gas guide groove 27; by having multiple gas guide grooves 27 evenly distributed around the axis of the positioning cone 26, the gas to be converted can enter the gas guide gap 8 evenly, ensuring that the gas to be converted is in full and accurate contact with the catalyst, thus ensuring the catalytic conversion effect.

[0076] like Figure 3As shown, in an optional embodiment of the present invention, the outer end of the outer tube 2 is formed with a first threaded tube 21, and a first limiting surface 22 is formed between the first threaded tube 21 and the outer end of the outer tube 2. The first threaded tube 21 is threadedly connected to the air outlet 32, and the first limiting surface 22 abuts against the side of the sealing end cap 3.

[0077] In this embodiment, the outer tube 2 and the air outlet chamber 32 are threaded together by the first threaded tube 21. The connection between the outer tube 2 and the air outlet chamber 3 is sealed by the first limiting surface 22 abutting against the side of the sealing end cap 3. To further enhance the sealing performance, a sealing ring is fitted on the outside of the first threaded tube 21. After the first threaded tube 21 and the air outlet chamber 32 are threaded together, the sealing ring is tightly located between the first limiting surface 22 and the side of the sealing end cap 3.

[0078] like Figure 3 As shown, in an optional embodiment of the present invention, a second threaded tube 61 is formed at the outer end of the inner tube 6, a second limiting surface 62 is formed between the second threaded tube 61 and the outer end of the inner tube 6, the second threaded tube 61 is threadedly connected to the air inlet chamber 31, and the second limiting surface 62 abuts against the inner wall between the air inlet chamber 31 and the air outlet chamber 32.

[0079] In this embodiment, the inner tube 6 is threadedly connected to the air intake chamber 31 through the second threaded tube 61. The second limiting surface 62 abuts against the inner wall between the air intake chamber 31 and the air outlet chamber 32, which can ensure the sealing of the connection between the inner tube 6 and the air intake chamber 31. To further increase the sealing, a sealing ring is fitted on the outside of the second threaded tube 61. After the second threaded tube 61 is connected to the air intake chamber 31, the sealing ring is tightly located between the second limiting surface 62 and the inner wall between the air intake chamber 31 and the air outlet chamber 32.

[0080] The ammonia gas catalytic converter provided by the above embodiment of the utility model, through the threaded connection of the outer pipe 2 and the gas outlet cavity 32 and the threaded connection of the inner pipe 6 and the gas inlet cavity 31, the inner pipe 6 and the outer pipe 2 are in the coaxial state through the sealing end cover 3 and the outer shell 1, so as to form the gas guide gap 8, and the catalyst is uniformly distributed inside the gas guide gap 8, which can make the to-be-converted gas fully and accurately contact with the catalyst and improve the conversion effect; the connection between the gas outlet cavity 32 and the outer pipe 2 can be removed through the screwing mode, so that the inner pipe 6 is pulled out through the sealing end cover 3, the catalyst on the outer wall of the inner pipe 6 is replaced, the inner pipe 6 is inserted into the outer pipe 2, and the connection between the gas outlet cavity 32 and the outer pipe 2 is realized through screwing; during the whole catalyst replacement operation process, the inner pipe 6 and the outer pipe 2 can be kept in the coaxial state, so that the local catalyst is prevented from being pressed during the replacement process and the catalyst is uniformly distributed, the contact effect of the gas and the catalyst is ensured, and the catalytic conversion effect is ensured; the sealing end of the outer pipe 2 is limited and supported by the positioning sleeve formed by the butt joint of the first arc-shaped plate 111 and the second arc-shaped plate 121, the stability of the outer pipe 2 can be improved, so that the outer pipe 2 and the inner pipe 6 are stably kept in the coaxial state, the catalyst is uniformly and fully distributed inside the gas guide gap 8, the to-be-converted gas fully contacts with the catalyst, and the catalytic conversion effect is ensured; the inner end of the inner pipe 6 is assisted and positioned by the positioning cone 26, so that the inner pipe 6 and the outer pipe 2 are accurately kept in the coaxial state, the catalyst is uniformly and fully distributed inside the gas guide gap 8, the to-be-converted gas fully contacts with the catalyst, and the catalytic conversion effect is ensured; the to-be-converted gas is uniformly distributed into the gas guide gap 8 through the plurality of gas guide grooves 27 which are uniformly distributed in the circumferential direction of the axis of the positioning cone 26, the to-be-converted gas fully and accurately contacts with the catalyst, and the catalytic conversion effect is ensured.

[0081] The above is the preferred embodiment of the utility model, and it should be noted that, for those skilled in the art, without departing from the principle of the utility model, some improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the utility model.

Claims

1. An ammonia catalytic converter characterized by: The utility model relates to a catalytic converter, which comprises: an outer tube (2) arranged inside an outer shell (1), the sealed end of the outer tube (2) being located inside the outer shell (1), and the open end of the outer tube (2) being located outside the outer shell (1); a heating element (7) arranged on the outer wall of the outer tube (2), the heating element (7) being located inside the outer shell (1); a sealed end cover (3) provided with an air inlet cavity (31) and an air outlet cavity (32) inside, the air inlet cavity (31) being coaxial with and communicating with the air outlet cavity (32), the inner diameter of the air outlet cavity (32) being larger than that of the air inlet cavity (31), the air outlet cavity (32) having a port penetrating through the side surface of the sealed end cover (3), and the outer end of the outer tube (2) being threadedly connected with the air outlet cavity (32); an inner tube (6) having two open ends, the outer end of the inner tube (6) being threadedly connected with the air inlet cavity (31), the inner tube (6) extending into the inner part of the outer tube (2), and a gas guiding gap (8) for accommodating a catalyst being formed between the outer wall of the inner tube (6) and the inner wall of the outer tube (2), the gas guiding gap (8) being in communication with the air outlet cavity (32); an air outlet tube (5) formed on the surface of the sealed end cover (3), the air outlet tube (5) being in communication with the air outlet cavity (32); an air inlet tube (4) formed on the side surface of the sealed end cover (3), the air inlet tube (4) being in communication with the air inlet cavity (31).

2. The ammonia catalytic converter of claim 1, wherein, Further comprising: a heat insulation sleeve (9) sleeved outside the outer tube (2) and the heating element (7), the heat insulation sleeve (9) being located inside the outer shell (1).

3. The ammonia catalytic converter of claim 1, wherein, The outer shell (1) comprises: a lower shell (11) and an upper shell (12) which are butted to form a complete outer shell (1); the same side surfaces of the lower shell (11) and the upper shell (12) are respectively provided with a first half hole (15) and a second half hole (16), the first half hole (15) and the second half hole (16) being butted to form a circular hole for accommodating and fixing the outer tube (2); the outer sides of the lower shell (11) and the upper shell (12) are respectively provided with a first connecting block (13) and a second connecting block (14), the first connecting block (13) and the second connecting block (14) being connected by a threaded nut.

4. The ammonia catalytic converter of claim 3, wherein, the inner walls of the lower shell (11) and the upper shell (12) are respectively provided with a first arc-shaped plate (111) and a second arc-shaped plate (121), the first arc-shaped plate (111) and the second arc-shaped plate (121) being butted to form a positioning sleeve, and the sealed end of the outer tube (2) is inserted and matched with the positioning sleeve.

5. The ammonia catalytic converter of claim 3, wherein, the outer wall of the outer tube (2) is provided with a limiting block (23), the limiting block (23) is provided with two limiting blocks (23), and the two limiting blocks (23) respectively abut against the inner wall of the lower shell (11) provided with the first half hole (15) and the inner wall of the upper shell (12) provided with the second half hole (16).

6. The ammonia catalytic converter of claim 5, wherein, The inner wall of the first half hole (15) and the inner wall of the second half hole (16) are provided with limiting grooves (17) corresponding to the limiting blocks (23), and the two limiting blocks (23) are respectively inserted into the corresponding limiting grooves (17).

7. The ammonia catalytic converter of claim 3, wherein, The lower shell (11) is provided with a threading groove (18) penetrating through the inner wall of the first half hole (15).

8. The ammonia catalytic converter of claim 1, wherein, The sealing end of the outer tube (2) is provided with a connecting cavity (24); The connecting cavity (24) is internally threadedly connected with a cover body (25); The inner wall of the cover body (25) is provided with a positioning cone (26) inserted into the inner tube (6), and the taper surface of the positioning cone (26) abuts against the inner wall of the inner tube (6); The taper surface of the positioning cone (26) is provided with a gas guide groove (27) communicating the inner cavity of the inner tube (6) and the gas guide gap (8); The gas guide groove (27) is provided with a plurality of gas guide grooves (27) uniformly distributed around the axis of the positioning cone (26).

9. The ammonia catalytic converter of claim 1, wherein, The outer end of the outer tube (2) is formed with a first threaded tube (21), a first limiting surface (22) is formed between the first threaded tube (21) and the outer end of the outer tube (2), the first threaded tube (21) is threadedly connected with the air outlet cavity (32), and the first limiting surface (22) abuts against the side surface of the sealing end cover (3).

10. The ammonia catalytic converter of claim 1, wherein, The outer end of the inner tube (6) is formed with a second threaded tube (61), a second limiting surface (62) is formed between the second threaded tube (61) and the outer end of the inner tube (6), the second threaded tube (61) is threadedly connected with the air inlet cavity (31), and the second limiting surface (62) abuts against the inner wall between the air inlet cavity (31) and the air outlet cavity (32).

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