Nozzle for primary air distributor in methanol to olefins plant regenerator

Abstract

The present invention provides a nozzle for the main air distributor in the regenerator of a methanol-to-olefins plant. The nozzle comprises a metal outer shell, a metal end shell, and a ceramic inner core. The metal end shells are assembled to form a hollow structure, and the ceramic inner core is installed within the hollow structure formed by the metal outer shell and the two metal end shells. A circular opening is provided at the center of the metal end shell. A flow channel based on a Tesla valve is provided in the ceramic inner core along the direction of gas flow, and the flow channel is arranged corresponding to the circular opening. This nozzle can reduce catalyst backflow and reduce wear and tear in the main air distributor and the nozzle. This nozzle can reduce catalyst backflow and reduce wear and tear in the main air distributor and the nozzle.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of methanol to olefins, and particularly relates to a nozzle for a main air distributor in a methanol to olefins device regenerator. BACKGROUND

[0002] In a methanol to olefins device, a regenerator burns the carbon-containing catalyst from a reactor, and in order to have enough oxygen in the regenerator to burn the carbon on the catalyst and to maintain a stable circulating fluidization of the circulating fluidized bed, a large amount of air (main air) is required to enter the regenerator through a main air distributor in the regenerator. During maintenance, it was found that the nozzle of the main air distributor in the regenerator was severely worn, and although a large amount of wear-resistant material was used, it was still unable to avoid the catalyst from backflowing into the main air distributor due to operation adjustment or fluctuation of working conditions, and the part of the catalyst backflowing into the main air distributor was the main factor causing the wear of the main air nozzle, and at the same time of preventing the catalyst from backflowing into the main air nozzle, it was unable to ensure that the nozzle had enough flux and did not change the jet direction. SUMMARY

[0003] A first object of the present application is to provide a nozzle for a main air distributor in a methanol to olefins device regenerator, which can reduce catalyst backflow and reduce wear in the main air distributor and in the nozzle.

[0004] A second object of the present application is to provide a main air distributor having the aforementioned nozzle.

[0005] To achieve the first object of the present application, the following technical solutions are adopted:

[0006] A nozzle for a main air distributor in a methanol to olefins device regenerator, the nozzle comprising a metal shell, metal end shells, and a ceramic inner core, the metal end shells being two in number, the metal shell and the two metal end shells being assembled to form a hollow structure, and the ceramic inner core being installed in the hollow structure formed by the metal shell and the two metal end shells; a circular opening is provided at the center of the metal end shell for gas flow.

[0007] A flow channel based on a Tesla valve is provided in the ceramic inner core along the direction of gas flow, and the flow channel corresponds to the circular opening.

[0008] Preferably, the flow channel comprises a main flow channel along the direction of gas flow, and first and second branch flow channels located on opposite sides of the main flow channel; the main flow channel is provided corresponding to the circular opening, and the first and second branch flow channels are alternately provided on opposite sides of the main flow channel along the direction of gas flow.

[0009] Preferably, the first branch flow channel and the second branch flow channel are curved flow channels, and the tangential direction of the gas inlet end thereof and the direction opposite to the main flow channel are α1 and α2, respectively, and the tangential direction of the gas outlet end thereof and the direction opposite to the main flow channel are β1 and β2, respectively, wherein,

[0010] 42°≤α1≤60°, and / or 25°≤β1≤42°; and / or

[0011] 42°≤α2≤60°, and / or 25°≤β2≤42°.

[0012] Preferably, the first branch flow channel is at least one; and / or

[0013] the second branch flow channel is at least one.

[0014] Preferably, the first branch flow channel is located on the upper side of the main flow channel, and there are 1-2; the second branch flow channel is located on the lower side of the main flow channel, and there is one.

[0015] Preferably, the length of the main flow channel is c, the projection length of the first branch flow channel and the second branch flow channel on the main flow channel is a1 and a2, respectively, and the projection length of the first branch flow channel and the second branch flow channel on the plane of the cross section of the main flow channel is b1 and b2, respectively, wherein,

[0016] a1≤0.45c, and / or b1≤0.25a1; and / or

[0017] a2≤0.45c, and / or b2≤0.25a2.

[0018] Preferably, the inner diameter ratio of the first branch flow channel and / or the second branch flow channel to the main flow channel is less than 1.

[0019] Preferably, the inner diameter ratio of the first branch flow channel and / or the second branch flow channel to the main flow channel is inversely proportional to the gas flow rate.

[0020] Preferably, the metal shell is a cylindrical shell composed of two arched shells, the corresponding central angles of the arched shells are 180°, and the two arched shells are relatively buckled to form the metal shell; and / or

[0021] The metal end shell is an annular shell composed of two semi-annular shells, and the two semi-annular shells are relatively buckled to form the metal end shell; and / or

[0022] The ceramic inner core is a cylindrical core composed of two semi-cylindrical cores, and the semi-cylindrical cores are provided with corresponding flow channel grooves corresponding to the flow channels, and the two semi-cylindrical cores are relatively buckled to form the ceramic inner core.

[0023] Preferably, the outer surface roughness of the metal shell and the metal end shell is Ra50-Ra100.

[0024] To achieve the second object of the present application, a main air distributor with the aforementioned nozzle is also provided.

[0025] The present application has the following advantages:

[0026] The nozzle for the main air distributor in the methanol-to-olefins device regenerator of the present application has the following advantages:

[0027] 1. By providing a flow channel based on Tesla valve in the ceramic inner core, the structure based on Tesla valve is innovatively combined into the flow channel structure of the nozzle, so that on the one hand, the gas passing through the nozzle can only flow in one direction, thereby reducing the backflow of the gas, preventing the catalyst powder flowing with the gas from backflowing into the nozzle, the main air distributor and the main air distribution pipe thereof, causing wear to the inside of the main air distribution pipe and the nozzle, and prolonging the service life of the nozzle and the main air distributor; on the other hand, the main air can be sprayed to a farther distance, which is beneficial to the circulating fluidization of the catalyst in the regenerator.

[0028] 2. The outer surface of the metal shell and / or the metal end shell is provided as a rough surface, so that it is easier to hang the lining material when lining construction is performed on the main air distribution pipe body of the regenerator main air distributor, and the lining material is as much as possible avoided from falling off, the wear resistance of the outer surface of the nozzle is increased, and the wear of the catalyst powder to the outer surface of the nozzle is reduced.

[0029] 3. In addition to the main flow channel, the ceramic inner core is also provided with a first branch flow channel and a second branch flow channel, so that the overall diameter of the ceramic inner core is larger, and the inner core is thicker than the inner core without the first branch flow channel and the second branch flow channel, thereby improving the overall wear resistance thereof.

[0030] 4. The ceramic inner core is provided in the form of two half-cylindrical cores assembled and spliced, which facilitates the firing of the flow channel inside the ceramic inner core. The metal shell and the metal end shell are provided in the form of two halves assembled, which facilitates the manufacturing of the assembly. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a disassembled structure schematic diagram of the nozzle for the main air distributor in the methanol-to-olefins device regenerator of the present application in an embodiment;

[0032] Figure 2 is Figure 1 an assembled structure schematic diagram of the nozzle shown in FIG. 1;

[0033] Figure 3 is Figure 1 an assembled structure schematic diagram of the arched shell and the two half-cylindrical shells in the nozzle shown in FIG. 1;

[0034] Figure 4 is Figure 1 is a structural diagram of a half-cylindrical core in the nozzle shown in the figure;

[0035] Figure 5 is Figure 1 is a structural diagram of an inner flow channel in the ceramic inner core in the nozzle shown in the figure;

[0036] Figure 6 is Figure 1 is a related angle diagram of the inner flow channel in the ceramic inner core in the nozzle shown in the figure;

[0037] Figure 7 is Figure 1 is a related length diagram of the inner flow channel in the ceramic inner core in the nozzle shown in the figure. DETAILED DESCRIPTION

[0038] The technical solutions of the present application and its effects are further described below in combination with specific embodiments / examples. The following embodiments / examples are only used to illustrate the content of the present application, and the present application is not limited to the following embodiments or examples. Simple changes to the present application using the concept of the present application are within the scope of the present application.

[0039] A nozzle for a main air distributor in a methanol-to-olefin device regenerator, as shown in the figure, comprises a metal shell 1, two metal end shells 2, and a ceramic inner core 3. The metal end shells 2 are assembled with the metal shell 1 and the two metal end shells 2 to form a hollow structure, and the ceramic inner core 3 is installed in the hollow structure formed by the metal shell 1 and the two metal end shells 2. The center of the metal end shell 2 is provided with a circular opening for gas flow. Figures 1-7

[0040] The ceramic inner core 3 is provided with a flow channel 4 based on a Tesla valve in the direction of gas flow, and the flow channel 4 corresponds to the circular opening.

[0041] As understood by those skilled in the art, a Tesla valve is a one-way conduction valve for gas flow, without any moving parts, and without the need for input energy to achieve one-way conduction of gas flow. Its forward flow and reverse flow are very different, and it does not need to be mechanically operated internally. It uses spatial structure to push gas flow and accelerates gas through physical structure, reducing energy loss of gas in transportation.

[0042] ​The skilled in the art can combine the structure based on Tesla valve into the flow channel structure of the nozzle by setting the flow channel 4 based on Tesla valve in the ceramic inner core 3, so that the gas passing through the nozzle can only flow in one direction, thereby reducing the gas backflow, preventing the catalyst powder flowing with the gas from flowing back into the nozzle, the main air distributor and the main air distribution pipe, causing wear to the inside of the main air distribution pipe and the nozzle, prolonging the service life of the nozzle and the main air distributor; on the other hand, the main air can be sprayed farther, which is beneficial to the circulating fluidization of the catalyst in the regenerator.

[0043] The skilled in the art understands that the ceramic inner core 3 is made of wear-resistant ceramic, and the metal shell 1 and the metal end shell 2 are made of wear-resistant metal, such as stainless steel, titanium steel, etc.

[0044] In an embodiment, the outer surface roughness of the metal shell 1 and / or the metal end shell 2 is Ra50-Ra100, so that it is easier to hang the lining material when lining the main air distribution pipe body of the regenerator main air distributor, and to avoid its falling off as much as possible, increase the wear resistance of the outer surface of the nozzle, and reduce the wear of the outer surface of the nozzle by the catalyst powder.

[0045] In an embodiment, the flow channel 4 includes a main flow channel 41 in the direction of gas flow, and a first branch flow channel 42 and a second branch flow channel 43 located on opposite sides of the main flow channel 41; the main flow channel 41 is provided corresponding to the circular opening, and the first branch flow channel 42 and the second branch flow channel 43 are alternately provided on opposite sides of the main flow channel 41 in the direction of gas flow.

[0046] In addition to the main flow channel 41, the ceramic inner core 3 also has the first branch flow channel 42 and the second branch flow channel 43, so the overall diameter of the ceramic inner core 3 is larger than that of the inner core without the first branch flow channel 42 and the second branch flow channel 43, thereby improving the overall wear resistance.

[0047] In an embodiment, the first branch flow channel 42 and the second branch flow channel 43 are both curved flow channels, and the included angle between the tangential direction of the gas inlet end and the opposite direction of the main flow channel 41 is α1 and α2 respectively, and the included angle between the tangential direction of the gas outlet end and the opposite direction of the main flow channel 41 is β1 and β2 respectively, wherein,

[0048] 42° < a2 < 60°, such as 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58° and 59°; and / or 25° < b2 < 42°, such as 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40° and 41°.

[0049] 42° < a2 < 60°, such as 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58° and 59°; and / or 25° < b2 < 42°, such as 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40° and 41°.

[0050] The limitation of the angles is advantageous for further preventing gas backflow and avoiding abrasion of the catalyst powder with gas backflow to the inside of the nozzle and the primary air distributor.

[0051] In an embodiment, the first branch flow channel 42 is at least one; and / or

[0052] The second branch flow channel 43 is at least one.

[0053] In an embodiment, the first branch flow channel 42 is 1-2 at the upper side of the main flow channel 41; and the second branch flow channel 43 is one at the lower side of the main flow channel 41.

[0054] The skilled person understands that "upper side" and "lower side" are relative to the orientation in the Figure 4 and are for the convenience of presentation.

[0055] In order to further prevent gas backflow and avoid abrasion of the catalyst powder with gas backflow to the inside of the nozzle and the primary air distributor, in an embodiment, the length of the main flow channel 41 is c, the projection length of the first branch flow channel 42 and the second branch flow channel 43 on the main flow channel 41 is a1 and a2 respectively, and the projection length of the first branch flow channel 42 and the second branch flow channel 43 on the plane of the cross section of the main flow channel 41 is b1 and b2 respectively, wherein,

[0056] a1 < 0.45c, such as 0.44c, 0.43c, 0.42c, 0.41c, 0.4c, 0.39c, 0.38c, 0.37c,

[0057] 0.36c, 0.35c, 0.34c, 0.33c, 0.32c, 0.31c, 0.3c, 0.29c, 0.28c, 0.27c, 0.26c, 0.25c, 0.24c, 0.23c, 0.22c, 0.21c, 0.2c, 0.15c, 0.1c and 0.05c; and / or b1 < 0.25a1, such as 0.24a1, 0.23a1, 0.22a1, 0.21a1, 0.2a1, 0.19a1, 0.18a1, 0.17a1, 0.16a1, 0.15a1, 0.14a1, 0.13a1, 0.12a1, 0.11a1, 0.1a1 and 0.05a1; and / or

[0058] a2 < 0.45c, such as 0.44c, 0.43c, 0.42c, 0.41c, 0.4c, 0.39c, 0.38c, 0.37c,

[0059] 0.36c, 0.35c, 0.34c, 0.33c, 0.32c, 0.31c, 0.3c, 0.29c, 0.28c, 0.27c, 0.26c, 0.25c, 0.24c, 0.23c, 0.22c, 0.21c, 0.2c, 0.15c, 0.1c and 0.05c; and / or b2 < 0.25a2, such as 0.24a2, 0.23a2, 0.22a2, 0.21a2, 0.2a2, 0.19a2, 0.18a2, 0.17a2, 0.16a2, 0.15a2, 0.14a2, 0.13a2, 0.12a2, 0.11a2, 0.1a2 and 0.05a2.

[0060] In one embodiment, the inner diameter ratio of the first branch flow channel 42 and / or the second branch flow channel 43 to the main flow channel 41 is less than 1. That is, the inner diameter of the first branch flow channel 42 and / or the second branch flow channel 43 is less than the inner diameter of the main flow channel 41.

[0061] In one embodiment, the inner diameter ratio of the first branch flow channel 42 and / or the second branch flow channel 43 to the main flow channel 41 is inversely proportional to the gas flow rate. That is, when the gas flow rate is large, the inner diameter ratio of the first branch flow channel 42 and / or the second branch flow channel 43 to the main flow channel 41 is small; conversely, when the gas flow rate is small, the inner diameter ratio of the first branch flow channel 42 and / or the second branch flow channel 43 to the main flow channel 41 is large.

[0062] In one embodiment, the metal shell 1 is a cylindrical shell, which is composed of two arched shells 11, the corresponding central angles of the arched shells 11 are 180°, and the two arched shells 11 are oppositely buckled to form the metal shell 1; and / or

[0063] The metal end shell 2 is an annular shell, which is composed of two half annular shells 21, and the two half annular shells 21 are oppositely buckled to form the metal end shell 2; and / or

[0064] The ceramic inner core 3 is a cylindrical core, which is composed of two half cylindrical cores 31, and the half cylindrical cores 31 are provided with corresponding flow channel grooves corresponding to the flow channels 4, and the two half cylindrical cores 31 are oppositely buckled to form the ceramic inner core 3.

[0065] In the present application, the ceramic inner core 3 is provided in the form of two half cylindrical cores 31 assembled and spliced, which facilitates the firing of the flow channels 4 inside the ceramic inner core 3. The metal outer shell 1 and the metal end shell 2 are provided in the form of two halves assembled, which facilitates the manufacturing of the components.

[0066] Those skilled in the art understand that in the metal outer shell 1, the two arched shells 11 can be fixed by the fixing method commonly used in the art, such as by welding; and / or

[0067] In the metal end shell 2, the two half annular shells 21 can be fixed by the fixing method commonly used in the art, such as by welding; and / or

[0068] In the ceramic inner core 3, the two half cylindrical cores 31 can be fixed by the fixing method commonly used in the art, such as by high-temperature-resistant adhesive; and / or

[0069] The metal outer shell 1 and the metal end shell 2 can be fixed by the fixing method commonly used in the art, such as by welding; and / or

[0070] The metal outer shell 1 and / or the metal end shell 2 and the ceramic inner core 3 can be fixed by the fixing method commonly used in the art, such as by high-temperature-resistant adhesive.

[0071] Those skilled in the art understand that the high-temperature-resistant adhesive is the high-temperature-resistant adhesive commonly used in the art, such as ZS-1071 inorganic adhesive.

[0072] The nozzle of the present application, when in use, is installed on the main air distribution pipe of the main air distributor of the methanol to olefins device regenerator, and the gas flow and the catalyst running with the gas flow are input into the flow channel 4 from the inlet end (i.e., the left end) of the nozzle, and are output from the outlet end (i.e., the right end) of the nozzle through the main flow channel 41, the first branch flow channel 42 and the second branch flow channel 43 in the forward direction; if the gas flow is in the reverse direction, the gas flow is output from the outlet end (i.e., the right end) of the nozzle through the first branch flow channel 42 and the second branch flow channel 43 in the reverse direction. Figures 1-7 Figures 1-7 Figures 1-7 ​​An opposite force (i.e. Figures 1-7 to the right) is generated, thereby preventing the gas flow and the catalyst flowing with the gas from flowing reversely into the nozzle and the main air distribution pipe.

[0073] The application also provides a main air distributor with the aforementioned nozzle.

[0074] The application also provides a regenerator with the aforementioned main air distributor.

[0075] The application also provides a methanol-to-olefin device with the aforementioned regenerator.

[0076] The nozzle of the application can make the gas flowing through it only in one direction, thereby reducing the gas backflow, preventing the catalyst powder flowing with the gas from backflowing into the nozzle, the main air distributor and the main air distribution pipe, causing abrasion to the inside of the main air distribution pipe and the nozzle, prolonging the service life of the nozzle and the main air distributor; on the other hand, the nozzle can make the main air jet further, which is beneficial to the circulation fluidization of the catalyst in the regenerator.

[0077] The main air distributor, the regenerator and the methanol-to-olefin device with the aforementioned nozzle can also avoid the abrasion caused by the gas backflow, thereby prolonging the service life.

[0078] The application will be further illustrated by specific examples and comparative examples.

[0079] Example 1 (S1)

[0080] The nozzle shown in Figures 1-7 was installed on the main air distributor of the regenerator of a methanol-to-olefin device, and then the methanol-to-olefin process was carried out. Among them,

[0081] α1= 50°, β1= 30°;

[0082] α2= 50°, β2= 30°;

[0083] a1= 0.45c, b1= 0.25a1;

[0084] a2= 0.45c, b2= 0.25a2;

[0085] The outer surface roughness of the metal shell 1 and the metal end shell 2 is Ra100.

[0086] According to the methanol-to-olefin process, the feed treatment capacity of the gasified methanol is 250t / h, and the following results are obtained: the internal abrasion period T1 of the nozzle is about 13500h, and the outer lining of the nozzle is not easy to fall off.

[0087] Example 2 (S2)

[0088] The difference from Example 1 is only that:

[0089] a1 = 42°, b1 = 25°;

[0090] a2 = 42°, b2 = 25°.

[0091] According to the methanol-to-olefins process, the feeding treatment amount of the gasified methanol is 250 t / h, and the following results are obtained: the internal wear period T1 of the nozzle is about 13800 h, and the external lining of the nozzle is not easy to fall off.

[0092] Example 3 (S3)

[0093] The difference from Example 1 is only that:

[0094] a1 = 60°, b1 = 42°;

[0095] a2 = 60°, b2 = 42°.

[0096] According to the methanol-to-olefins process, the feeding treatment amount of the gasified methanol is 250 t / h, and the following results are obtained: the internal wear period T1 of the nozzle is about 13000 h, and the external lining of the nozzle is not easy to fall off.

[0097] Example 4 (S4)

[0098] The difference from Example 1 is only that:

[0099] a1 = 0.3c, b1 = 0.2a1;

[0100] a2 = 0.3c, b2 = 0.2a2.

[0101] According to the methanol-to-olefins process, the feeding treatment amount of the gasified methanol is 250 t / h, and the following results are obtained: the internal wear period T1 of the nozzle is about 13200 h, and the external lining of the nozzle is not easy to fall off.

[0102] Example 5 (S5)

[0103] The difference from Example 1 is only that:

[0104] a1 = 0.4c, b1 = 0.15a1;

[0105] a2 = 0.4c, b2 = 0.15a2.

[0106] According to the methanol-to-olefin process, the feed processing capacity of the gasified methanol is 250 t / h, and the following results are obtained: the internal wear period T1 of the nozzle is about 13400 h, and the external lining of the nozzle is not easy to fall off.

[0107] Example 6 (S6)

[0108] The only difference from Example 1 is that:

[0109] The outer surface roughness of the metal shell 1 and the metal end shell 2 is Ra50.

[0110] According to the methanol-to-olefin process, the feed processing capacity of the gasified methanol is 250 t / h, and the following results are obtained: the internal wear period T1 of the nozzle is about 13500 h, and the external lining of the nozzle is not easy to fall off.

[0111] Comparative Example 1 (D1)

[0112] The only difference from Example 1 is that:

[0113] The outer surface roughness of the metal shell 1 and the metal end shell 2 is Ra25.

[0114] According to the methanol-to-olefin process, the feed processing capacity of the gasified methanol is 250 t / h, and the following results are obtained: the internal wear period T1 of the nozzle is about 13500 h, and the external lining of the nozzle is not easy to fall off.

[0115] Comparative Example 2 (D2)

[0116] The only difference from Example 1 is that:

[0117] It is composed of a metal pipe and a ceramic inner core, and the flow channel in the ceramic inner core is a straight flow channel;

[0118] The outer surface roughness of the metal pipe is Ra6.3 (the outer surface is smooth when the outer surface roughness is Ra6.3);

[0119] According to the methanol-to-olefin process, the feed processing capacity of the gasified methanol is 250 t / h, and the following results are obtained: the internal wear period T1 of the nozzle is about 13500 h, and the external lining of the nozzle is not easy to fall off.

Claims

1. A nozzle for a main air distributor in a regenerator of a methanol to olefins plant, characterized in that: The nozzle comprises a metal shell (1), a metal end shell (2) and a ceramic inner core (3), wherein there are two metal end shells (2), the metal shell (1) and the two metal end shells (2) are assembled to form a hollow structure, and the ceramic inner core (3) is installed in the hollow structure formed by the metal shell (1) and the two metal end shells (2); a circular opening is provided in the center of the metal end shell (2) for gas circulation; A flow channel (4) based on a Tesla valve is provided in the ceramic inner core (3) along the gas flow direction, and the flow channel (4) is provided corresponding to the circular opening; The flow channel (4) comprises a main flow channel (41) along the gas flow direction, and a first branch flow channel (42) and a second branch flow channel (43) located on opposite sides of the main flow channel (41); the main flow channel (41) is arranged corresponding to the circular opening, and the first branch flow channel (42) and the second branch flow channel (43) are alternately arranged on opposite sides of the main flow channel (41) along the gas flow direction; The first branch flow channel (42) and the second branch flow channel (43) are curved flow channels, and the angles between the tangential directions of the air inlet ends and the direction opposite to the main flow channel (41) are α1 and α2, respectively, and the angles between the tangential directions of the air outlet ends and the direction opposite to the main flow channel (41) are β1 and β2, respectively, wherein: 42 °≤α1≤60 °，25 °≤β1≤42 °； 42 °≤α2≤60 °，25 °≤β2≤42 °； The length of the main channel (41) is c, the projected lengths of the first branch channel (42) and the second branch channel (43) on the main channel (41) are a1 and a2, respectively, and the projected lengths of the first branch channel (42) and the second branch channel (43) on the plane where the cross section of the main channel (41) is located are b1 and b2, respectively, wherein: a1≤0.45c, b1≤0.25a1; a2≤0.45c, b2≤0.25a2.

2. The nozzle according to claim 1, characterized in that There is at least one first branch flow channel (42); and / or There is at least one second branch flow channel (43).

3. The nozzle according to claim 2, characterized in that The first branch flow channels (42) are located on the upper side of the main flow channel (41), and there are 1-2 of them; the second branch flow channel (43) is located on the lower side of the main flow channel (41), and there is 1 of them.

4. The nozzle according to any one of claims 1 to 3, characterized in that The inner diameter ratio of the first branch flow channel (42) and / or the second branch flow channel (43) to the main flow channel (41) is less than 1.

5. The nozzle according to claim 4, characterized in that The inner diameter ratio of the first branch flow channel (42) and / or the second branch flow channel (43) to the main flow channel (41) is inversely proportional to the gas flow rate.

6. The nozzle according to any one of claims 1 to 3 and 5, characterized in that The metal shell (1) is a cylindrical shell, which is composed of two arched shells (11), the corresponding central angle of the arched shells (11) is 180 degrees, and the two arched shells (11) are relatively buckled to form the metal shell (1); and / or The metal end shell (2) is an annular shell, consisting of two semi-annular shells (21), and the two semi-annular shells (21) are relatively buckled to form the metal end shell (2); and / or The ceramic inner core (3) is a cylindrical core body, which is composed of two semi-cylindrical core bodies (31). The semi-cylindrical core bodies (31) are provided with corresponding flow channel grooves corresponding to the flow channels (4). The two semi-cylindrical core bodies (31) are relatively buckled to form the ceramic inner core (3).

7. The nozzle according to claim 6, characterized in that The outer surface roughness of the metal shell (1) and / or the metal end shell (2) is Ra50-Ra100.

8. A primary air distributor comprising the nozzle according to any one of claims 1 to 7.

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