Combustor and cracking furnace

Abstract

The utility model belongs to the technical field of combustors, and discloses a combustor and a cracking furnace, the combustor comprises a burner block, the burner block is configured to be arranged in a hearth of the cracking furnace, the burner block comprises two oppositely arranged first brick bodies and two oppositely arranged second brick bodies, the two first brick bodies and the two second brick bodies define an air flow channel, the first brick bodies are in a flat plate shape, the second brick bodies are in an arc shape, the axes of the two second brick bodies are located in the air flow channel, one of the two first brick bodies is an adjacent brick body, the other one is a fixed brick body, and a furnace tube is arranged in the hearth. According to the combustor, the distance between flames and the furnace tube can be increased, the probability that the flames impact the furnace tube is reduced, then the probability that the local high temperature occurs to the furnace tube can be reduced, and the service life of the furnace tube is prolonged. The effect of prolonging the operation period of the furnace tube and the cracking furnace is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to burner technical field especially relates to a burner and cracking furnace. BACKGROUND

[0002] The burner is the device that fuel gas and air are mixed combustion in a certain way, wherein, the burner brick and fuel gas spray head are all arranged in the hearth of the cracking furnace, the burner brick is equipped with the combustion air flow channel, the fuel gas spray head is arranged at the outer periphery of the burner brick, the fuel gas sprayed by the fuel gas spray head mixes with the combustion air in the top area of the burner brick and burns to form the flame.

[0003] At present, the cross section of the common burner brick is roughly circular, and in the radial direction of the burner brick, one side outer wall of the burner brick is tightly attached to the inner side wall of the hearth, and the other side outer wall of the burner brick is spaced apart from the furnace tube in the hearth, which makes the center line of the combustion air flow channel and the spacing between the furnace tube smaller, that is, the spacing between the flame and the furnace tube is smaller, and the problem of flame impacting the furnace tube is prone to occur, which can cause the local temperature of the furnace tube to be too high, thereby shortening the operation cycle of the furnace tube and the operation cycle of the cracking furnace.

[0004] Therefore, it is urgent to provide a burner and a cracking furnace to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The first purpose of the utility model is to provide a burner, which can increase the spacing between the flame and the furnace tube.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] The burner comprises

[0008] The burner brick is configured to be arranged in the hearth of the cracking furnace, the burner brick comprises two oppositely arranged first brick bodies and two oppositely arranged second brick bodies, the two first brick bodies and the two second brick bodies enclose to form an air flow channel, the first brick body is in the form of a flat plate, the second brick body is in the form of a circular arc, and the axes of the two second brick bodies are located in the air flow channel, one of the two first brick bodies is a proximal brick body, and the other is a fixed brick body, the hearth is provided with a furnace tube, and the side of the proximal brick body away from the air flow channel is configured to be spaced apart from the furnace tube, and the side of the fixed brick body away from the air flow channel is used to be attached to the inner side wall of the hearth.

[0009] Optionally, the burner further comprises a first spray head and a second spray head, the first spray head is located at the side of the proximal brick body away from the air flow channel, the first spray head is provided with a first spray hole, the second spray head is located at the side of the second brick body away from the air flow channel, the second spray head is provided with a second spray hole, and the first fuel gas sprayed by the first spray hole and the second fuel gas sprayed by the second spray hole can be mixed with the combustion air flowing out of the air flow channel to form a flame.

[0010] Optionally, along the direction in which the first fuel gas is ejected from the first nozzle, the axis of the first nozzle is inclined toward the direction of the airflow channel.

[0011] Optionally, the combustion air can flow in the air channel along the first direction, and both the first reference line and the second reference line are parallel to the first direction, and the positive directions of the first reference line and the second reference line are the same as the direction of the first direction.

[0012] The first reference line intersects the axis of the first nozzle, and the angle between the axis of the first nozzle and the positive direction of the first reference line along the direction in which the first fuel gas is ejected from the first nozzle is α.

[0013] The second reference line intersects the axis of the second nozzle. Along the direction in which the second fuel gas is ejected from the second nozzle, the axis of the second nozzle is inclined toward the direction of the air flow channel, and the angle between the axis of the second nozzle and the positive direction of the second reference line is β, where α is greater than β.

[0014] Optionally, there are multiple first nozzles, at least one of which is a first ejector nozzle. The second brick is provided with a first ejector channel. One end of the first ejector channel is connected to the air flow channel, and the other end is used to connect to the furnace. The first ejector nozzle is provided with a first ejector nozzle on the side facing the first ejector channel. The first ejector nozzle is coaxial with the first ejector channel.

[0015] There are multiple second nozzles, at least one of which is a second ejector nozzle. A second ejector channel is provided on the second brick. One end of the second ejector channel is connected to the air flow channel, and the other end is used to connect to the furnace. A second ejector nozzle is provided on the side of the second ejector nozzle facing the second ejector channel. The second ejector nozzle is coaxial with the second ejector channel.

[0016] Optionally, the end of the first ejector channel facing the airflow channel points to the side of the second brick facing the airflow channel, and the end of the second ejector channel facing the airflow channel points to the side of the second brick facing the airflow channel.

[0017] Optionally, the inner wall of the first ejector channel at one end facing the airflow channel is tangent to the surface of the second brick on the side facing the airflow channel, and the inner wall of the second ejector channel at one end facing the airflow channel is tangent to the surface of the second brick on the side facing the airflow channel.

[0018] Optionally, the first nozzle is further provided with a third nozzle that can spray the first fuel gas to the root of the flame, and the second nozzle is further provided with a fourth nozzle that can spray the second fuel gas to the root of the flame.

[0019] Optionally, the side of the adjacent brick body away from the air flow channel is provided with a first flame stabilizing groove, the first flame stabilizing groove extends to the end face of the end of the adjacent brick body facing the flame, and the partial moving track of the first fuel gas sprayed by the third spray hole is located in the first flame stabilizing groove;

[0020] The side of the second brick body away from the air flow channel is provided with a second flame stabilizing groove, the second flame stabilizing groove extends to the end face of the end of the second brick body facing the flame, and the partial moving track of the second fuel gas sprayed by the fourth spray hole is located in the second flame stabilizing groove.

[0021] The second purpose of the utility model lies in providing a cracking furnace, the furnace tube of the cracking furnace has a lower probability of being impacted by the flame.

[0022] In order to achieve the purpose, the utility model adopts the following technical scheme:

[0023] The cracking furnace comprises a furnace tube, a hearth and the above-mentioned burner, the furnace tube and the burner brick are arranged in the hearth, the furnace tube is located at the side of the adjacent brick body away from the air flow channel and is arranged in a spaced manner with the adjacent brick body, and the side of the fixed brick body away from the air flow channel is attached to the inner side wall of the hearth.

[0024] The utility model has the advantages of:

[0025] The burner provided by the utility model is located in the hearth of the cracking furnace, the burner brick comprises two oppositely arranged first brick bodies and two oppositely arranged second brick bodies, the two first brick bodies and the two second brick bodies enclose to form an air flow channel, the first brick body is in a flat plate shape, the second brick body is in a circular arc shape, the axis of the two second brick bodies is located in the air flow channel, one of the two first brick bodies is an adjacent brick body, and the other is a fixed brick body, the side of the adjacent brick body away from the air flow channel is arranged in a spaced manner with the furnace tube in the hearth, the side of the fixed brick body away from the air flow channel is attached to the inner side wall of the hearth, and the special shape design of the first brick body and the second brick body makes the burner brick and the air flow channel form a runway shape structure. Compared with the burner brick and the air flow channel in a circular shape, under the condition that the position of the inner side wall of the hearth, the position of the furnace tube and the cross-sectional area of the air flow channel are all the same, the distance between the center line of the runway shape air flow channel and the furnace tube is larger, that is to say, the runway shape air flow channel can increase the distance between the flame and the furnace tube, thereby reducing the probability of the flame impacting the furnace tube and reducing the probability of the local high temperature problem of the furnace tube, thereby prolonging the operation cycle of the furnace tube and the cracking furnace. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the front view of the burner provided by the utility model;

[0027] Figure 2 is the top view of the cracking furnace provided by the utility model;

[0028] Figure 3 is a top view of the burner provided by the utility model;

[0029] Figure 4 is a structural schematic view of the first injection head provided by the utility model;

[0030] Figure 5 is Figure 4 the A-A direction section view in figure;

[0031] Figure 6 is Figure 4 the B-B direction section view in figure;

[0032] Figure 7 is a structural schematic view of the second injection head provided by the utility model;

[0033] Figure 8 is Figure 7 the C-C direction section view in figure;

[0034] Figure 9 is Figure 7 the D-D direction section view in figure.

[0035] in the figure:

[0036] D1, first direction; D2, second direction; D3, third direction; D4, fourth direction;

[0037] 111, first fuel supply pipe; 112, second fuel supply pipe; 12, first injection head; 121, first injection hole; 122, first injection head; 1221, first injection hole; 123, third injection hole; 13, second injection head; 131, second injection hole; 132, second injection head; 1321, second injection hole; 133, fourth injection hole; 134, fifth injection hole; 21, first brick body; 211, adjacent brick body; 2111, first flame stabilizing groove; 2112, first sub-adjacent brick body; 2113, second sub-adjacent brick body; 212, fixed brick body; 22, second brick body; 221, first injection channel; 222, second injection channel; 223, second flame stabilizing groove; 2241, first sub-arc-shaped brick body; 2242, second sub-arc-shaped brick body; 23, air flow channel; 3, flame; 43, furnace chamber; 431, inner side wall; 5, first reference line; 6, permanent light; 7, furnace tube. DETAILED DESCRIPTION

[0038] The utility model will be further explained in detail in connection with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0039] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate media, can be two elements inside the communication or two element's mutual action relation.For the ordinary skilled in the art, can understand the specific meaning of the above-mentioned terms in the utility model according to specific circumstances.

[0040] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features is not direct contact but is through the contact between other features between them.And, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0041] In the description of the embodiment, the term "on", "under", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the term "first", "second" is only used to distinguish in the description, and has no special meaning.

[0042] The embodiment provides a kind of burner, which can increase the spacing of flame and furnace tube, and then reduce the probability of flame impacting furnace tube.

[0043] Specifically, as Figures 1 to 3As shown, the burner comprises a burner brick configured to be arranged in the furnace chamber 43 of the cracking furnace, the burner brick comprises two oppositely arranged first brick bodies 21 and two oppositely arranged second brick bodies 22, two sides of each first brick body 21 are connected with a corresponding second brick body 22 respectively, the two first brick bodies 21 and the two second brick bodies 22 enclose an air flow channel 23, combustion air can flow in the air flow channel 23 along a first direction D1, the first brick body 21 is in a flat plate shape, the second brick body 22 is in a circular arc shape, and the axes of the two second brick bodies 22 are located in the air flow channel 23, one of the two first brick bodies 21 is a proximal brick body 211, and the other is a fixed brick body 212, the furnace chamber 43 is provided with a furnace tube 7, and the side of the proximal brick body 211 away from the air flow channel 23 is configured to be arranged in a spaced manner with the furnace tube 7, and the side of the fixed brick body 212 away from the air flow channel 23 is used to be attached to the inner side wall 431 of the furnace chamber 43.

[0044] When the burner is in operation, the flame 3 is located substantially downstream of the combustion air flow and opposite the air flow channel 23, and in this embodiment, the flame 3 is located directly above the air flow channel 23. The special shape design of the first brick body 21 and the second brick body 22 of the burner makes the burner brick and the air flow channel 23 form a runway-shaped structure. Compared with the burner brick and the air flow channel in a circular structure, when the inner side wall 431 position of the furnace chamber 43, the furnace tube 7 position and the air flow channel 23 cross-sectional area are the same, the center line of the runway-shaped air flow channel 23 is farther away from the furnace tube 7, that is, the runway-shaped air flow channel 23 can increase the distance between the flame 3 and the furnace tube 7 (i.e. the distance between the flame 3 and the furnace tube 7 in the second direction D2), thereby reducing the probability of the flame 3 impacting the furnace tube 7 and reducing the probability of the furnace tube 7 appearing local high temperature, thereby prolonging the operation cycle of the furnace tube 7 and the cracking furnace. It should be pointed out that the above-mentioned cross section refers to the cross section obtained by cutting in a plane perpendicular to the axis of the flame 3.

[0045] In this embodiment, the first direction D1 refers to a vertically upward direction, that is, the combustion air in the air flow channel 23 flows vertically upward. Of course, in other embodiments, the first direction D1 can also refer to a horizontal direction or other directions, and this embodiment is described by taking the first direction D1 as a vertically upward direction.

[0046] Furthermore, the thickness of the fixed brick 212 is less than the thickness of the adjacent brick 211. For example, in this embodiment, the side of the fixed brick 212 away from the airflow channel 23 is thinned so that the thickness of the fixed brick 212 is less than the thickness of the adjacent brick 211. This allows the centerline of the airflow channel 23 to be closer to the inner wall 431 of the furnace 43 and farther away from the furnace tube 7. In other words, it allows the flame 3 to be closer to the inner wall 431 of the furnace 43 and farther away from the furnace tube 7, thereby further increasing the distance between the flame 3 and the furnace tube 7 in the second direction D2. Of course, in other embodiments, the side of the fixed brick 212 facing the airflow channel 23 can also be thinned so that the thickness of the fixed brick 212 is less than the thickness of the adjacent brick 211. The specific method depends on the actual situation.

[0047] Optionally, such as Figures 1 to 7 As shown, the burner also includes a first nozzle 12 and a second nozzle 13, both located within the furnace 43. The first nozzle 12 is connected to a first fuel supply pipe 111, and the second nozzle 13 is connected to a second fuel supply pipe 112. The first fuel supply pipe 111 delivers first fuel gas to the first nozzle 12, and the second fuel supply pipe 112 delivers second fuel gas to the second nozzle 13. The first nozzle 12 is located adjacent to the brick 211 and away from the airflow channel 2. On one side of the second brick 22, the furnace tube 7 is located on the side of the first nozzle 12 away from the adjacent brick 211 and spaced apart from the first nozzle 12. The first nozzle 12 is provided with a first nozzle hole 121. The second nozzle 13 is located on the side of the second brick 22 away from the air flow channel 23. The second nozzle 13 is provided with a second nozzle hole 131. The first fuel gas ejected from the first nozzle hole 121 and the second fuel gas ejected from the second nozzle hole 131 can both mix with the combustion air flowing out of the air flow channel 23 to form flame 3. It should be noted that the first fuel gas and the second fuel gas can be the same type of fuel gas or different types of fuel gas, depending on the actual application requirements. In other embodiments, the first nozzle 12 and the second nozzle 13 can both be connected to the same fuel supply pipe, in which case the first fuel gas and the second fuel gas are the same type of fuel gas.

[0048] Furthermore, along the direction in which the first fuel gas is ejected from the first nozzle 121, the axis of the first nozzle 121 is inclined toward the direction of the air flow channel 23. That is, along the direction in which the first fuel gas is ejected from the first nozzle 121, the axis of the first nozzle 121 is inclined toward the direction of the fixed brick 212, so that the first fuel gas ejected from the first nozzle 121 is sprayed toward the flame 3 in a direction away from the furnace tube 7, thereby achieving the effect of further increasing the distance between the flame 3 and the furnace tube 7 in the second direction D2.

[0049] Further, the combustion air flows in the first direction D1 in the air flow channel 23, and the first direction D1 is a direction from the root of the flame 3 to the top of the flame 3, the first reference line 5 and the second reference line (not shown in the figure) are parallel to the first direction D1, and the positive direction of the first reference line 5 and the positive direction of the second reference line are the same as the direction of the first direction D1; the first reference line 5 intersects the axis of the first injection hole 121, and the angle between the axis of the first injection hole 121 and the positive direction of the first reference line 5 is α; the second reference line intersects the axis of the second injection hole 131, and the angle between the axis of the second injection hole 131 and the positive direction of the second reference line is β, and α is greater than β, which can make the first fuel gas sprayed from the first injection hole 121 closer to the root of the flame 3 in the first direction D1, and make the second fuel gas sprayed from the second injection hole 131 farther away from the root of the flame 3 in the first direction D1, so that the air mixture that has not been completely combusted at the root of the flame 3 can be mixed and combusted with the second fuel gas sprayed from the second injection hole 131, to achieve staged combustion and reduce the emission of nitrogen oxides.

[0050] Further, the third reference line (not shown in the figure) is parallel to the first direction D1, and the positive direction of the third reference line is the same as the direction of the first direction D1, and the fifth injection hole 134 is further provided on the second injection head 13, the axis of the fifth injection hole 134 intersects the third reference line, and the angle between the axis of the fifth injection hole 134 and the positive direction of the third reference line is γ, and β is greater than γ, and β is greater than γ on the basis of α being greater than β, and further, in the flame 3 area, the positions reached by the first fuel gas sprayed from the first injection hole 121, the second fuel gas sprayed from the second injection hole 131, and the second fuel gas sprayed from the fifth injection hole 134 are distributed along the first direction D1, so that three-stage combustion can be achieved, the length of the flame 3 is lengthened, the combustion uniformity is improved, and the emission of nitrogen oxides is further reduced.

[0051] In this embodiment, the adjacent brick 211 comprises a first sub-adjacent brick 2112 and a second sub-adjacent brick 2113, the top of the first sub-adjacent brick 2112 is connected with the bottom of the second sub-adjacent brick 2113, the side of the second sub-adjacent brick 2113 facing the first sub-adjacent brick 2112 is directed to the side of the second sub-adjacent brick 2113 away from the first sub-adjacent brick 2112, the second sub-adjacent brick 2113 is inclined to the direction of the air flow channel 23, and the side of the second sub-adjacent brick 2113 away from the air flow channel 23 is spaced apart from the furnace tube 7. The fixed brick 212 comprises a first sub-fixed brick 212 and a second sub-fixed brick 212 (neither of which is shown in the figure), the top of the first sub-fixed brick 212 is connected with the bottom of the second sub-fixed brick 212, the side of the second sub-fixed brick 212 facing the first sub-fixed brick 212 is directed to the side of the second sub-fixed brick 212 away from the first sub-fixed brick 212, the second sub-fixed brick 212 is inclined to the direction of the air flow channel 23, and the side of the first sub-fixed brick 212 away from the air flow channel 23 is attached to the inner side wall 431 of the hearth 43. The second brick 22 comprises a first sub-arc-shaped brick 2241 and a second sub-arc-shaped brick 2242, the top of the first sub-arc-shaped brick 2241 is connected with the bottom of the second sub-arc-shaped brick 2242, the side of the second sub-arc-shaped brick 2242 facing the first sub-arc-shaped brick 2241 is directed to the side of the second sub-arc-shaped brick 2242 away from the first sub-arc-shaped brick 2241, and the second sub-arc-shaped brick 2242 is inclined to the direction of the air flow channel 23. Thus, the end of the air flow channel 23 in the first direction D1 is a closed structure, which stabilizes the shape of the flame 3.

[0052] Optionally, as shown in Figure 3 The burner further comprises a permanent light 6 located in the air flow channel 23, so that the burner can maintain a stable small fire source before starting or after extinguishing, ensuring the continuity and stability of the combustion system.

[0053] Further, the distance between the permanent light 6 and the fixed brick 212 is smaller than the distance between the permanent light 6 and the adjacent brick 211, i.e. the permanent light 6 is located on the side of the air flow channel 23 facing the fixed brick 212, so as to ensure that the small fire source is away from the adjacent brick 211 and the furnace tube 7, avoiding the impact of the small fire source on the furnace tube 7.

[0054] Optionally, as shown in Figures 1 to 9As shown, the number of the first nozzles 12 is multiple, at least one of the multiple first nozzles 12 is a first injection nozzle 122, the second brick 22 is provided with a first injection channel 221, one end of the first injection channel 221 is communicated with the air flow channel 23, the other end is used for being communicated with the hearth 43, the first injection nozzle 122 is provided with a first injection orifice 1221 on the side facing the first injection channel 221, the first injection orifice 1221 is coaxial with the first injection channel 221, the first injection orifice 1221 sprays the first fuel gas into the first injection channel 221 at high speed, a negative pressure field is formed in the first injection channel 221, the flue gas in the hearth 43 close to the first injection channel 221 is sucked into the first injection channel 221 under the action of the negative pressure field, and then enters the air flow channel 23 from the first injection channel 221, in the air flow channel 23, the part of the flue gas is mixed with the first fuel gas and the combustion air and burns at the flame 3; the number of the second nozzles 13 is multiple, at least one of the multiple second nozzles 13 is a second injection nozzle 132, the second brick 22 is provided with a second injection channel 222, one end of the second injection channel 222 is communicated with the air flow channel 23, the other end is used for being communicated with the hearth 43, the second injection nozzle 132 is provided with a second injection orifice 1321 on the side facing the second injection channel 222, the second injection orifice 1321 is coaxial with the second injection channel 222, the second injection orifice 1321 sprays the second fuel gas into the second injection channel 222 at high speed, a negative pressure field is formed in the second injection channel 222, the flue gas in the hearth 43 close to the second injection channel 222 is sucked into the second injection channel 222 under the action of the negative pressure field, and then enters the air flow channel 23 from the second injection channel 222, in the air flow channel 23, the part of the flue gas is mixed with the second fuel gas and the combustion air and burns at the flame 3. The structure design makes part of the flue gas in the hearth 43 enter the air flow channel 23 and burn, realizes internal flue gas recirculation, achieves the effect of reducing oxygen partial pressure, and finally achieves the effect of reducing the amount of nitrogen oxides emission.

[0055] Further, the end of the first injection channel 221 facing the air flow channel 23 points to the side of the second brick 22 facing the air flow channel 23 (hereinafter referred to as the inner surface of the second brick 22), since the second brick 22 is in the shape of a circular arc, the inner surface of the second brick 22 is an arc surface, after the mixed gas (the mixed gas of the flue gas and the first fuel gas) emitted from the first injection channel 221 reaches the inner surface of the second brick 22, it flows along the arc inner surface of the second brick 22 to form a rotational flow state, thereby achieving the effect of rotational flow mixing of the flue gas, the first fuel gas and the combustion air in the air flow channel 23, compared with straight flow mixing, rotational flow mixing can make the flue gas, the first fuel gas and the combustion air mix more uniformly, which is beneficial to improve the combustion efficiency, improve the combustion stability and reduce the amount of nitrogen oxides emission.

[0056] Similarly, the second injection channel 222 points to the side of the second brick 22 facing the one end of the air flow channel 23 (i.e. the arc-shaped inner surface of the second brick 22) at the one end of the air flow channel 23, and the mixed gas (the mixture of the flue gas and the second fuel gas) ejected from the second injection channel 222 flows along the arc-shaped inner surface of the second brick 22 to form a swirling state, thereby achieving the swirling mixing effect of the flue gas, the first fuel gas and the combustion air in the air flow channel 23. Compared with the straight mixing, the swirling mixing can make the flue gas, the second fuel gas and the combustion air mix more uniformly, which is conducive to improving the combustion efficiency, improving the combustion stability and reducing the nitrogen oxide emission.

[0057] The burner does not need to be provided with a swirling mixing channel specially used for swirling mixing, nor does it need to be provided with a gas mixer. By designing the second brick 22 as a circular arc, the first injection channel 221 points to the side of the second brick 22 facing the one end of the air flow channel 23 at the one end of the air flow channel 23, and the second injection channel 222 points to the side of the second brick 22 facing the one end of the air flow channel 23 at the one end of the air flow channel 23, so that the flue gas, the first fuel gas and the combustion air are swirling mixed in the air flow channel 23, and the flue gas, the second fuel gas and the combustion air are swirling mixed in the air flow channel 23. The burner has the effects of simplifying the structure of the burner brick and reducing the parts of the burner, and is suitable for being widely used.

[0058] Further, the inner wall of the one end of the first injection channel 221 is tangent to the surface of the side of the second brick 22 facing the one end of the air flow channel 23, thereby improving the uniformity of the swirling mixing of the flue gas, the first fuel gas and the combustion air, and the inner wall of the one end of the second injection channel 222 is tangent to the surface of the side of the second brick 22 facing the one end of the air flow channel 23, thereby improving the uniformity of the swirling mixing of the flue gas, the second fuel gas and the combustion air.

[0059] It should be noted that the first injection nozzle 122 is located on the side of the brick 211 away from the air flow channel 23, and the first injection channel 221 corresponding to the first injection nozzle 122 is formed in the second brick 22, so that the inner diameter of the first injection channel 221 needs to be considered when the first injection channel 221 is prepared. When the inner diameter of the first injection channel 221 is large, a small part of the first injection channel 221 extends to the brick 211 in the radial direction of the first injection channel 221. When the inner diameter of the first injection channel 221 is small, the above-mentioned situation does not occur, i.e. when the inner diameter of the first injection channel 221 is small, the entire first injection channel 221 is located on the second brick 22.

[0060] Further, the end of the first injection channel 221 pointing towards the air flow channel 23 is directed towards the end of the first injection channel 221 pointing towards the furnace 43, and the axis of the first injection channel 221 is inclined towards the first direction D1, so that the mixed gas (the mixture of flue gas and first fuel gas) injected by the first injection channel 221 can flow along the first direction D1 while being swirled with the combustion air, i.e. the flue gas, the first fuel gas and the combustion air are swirled and rise in the air flow channel 23, achieving the effect of reducing flow resistance. The end of the second injection channel 222 pointing towards the air flow channel 23 is directed towards the end of the second injection channel 222 pointing towards the furnace 43, and the axis of the second injection channel 222 is inclined towards the first direction D1, so that the mixed gas (the mixture of flue gas and second fuel gas) injected by the second injection channel 222 can flow along the first direction D1 while being swirled with the combustion air, i.e. the flue gas, the second fuel gas and the combustion air are swirled and rise in the air flow channel 23, achieving the effect of reducing flow resistance.

[0061] In the present embodiment, as shown in Figure 3As shown, the number of the first nozzles 12 is three, two of the three first nozzles 12 are the first ejecting nozzles 122, and the remaining one first nozzle 12 is located between the two first ejecting nozzles 122. The number of the second nozzles 13 is four, two of the four second nozzles 13 are the second ejecting nozzles 132, and the remaining two second nozzles 13 correspond to the two second bricks 22 respectively, two of the second ejecting nozzles 132 correspond to the two second bricks 22 respectively, specifically, one of the two second bricks 22 is located on one side of the adjacent brick 211 in the third direction D3, the other of the two second bricks 22 is located on one side of the adjacent brick 211 in the fourth direction D4, the third direction D3 is parallel to the fourth direction D4 and the directions are opposite, the side of the second brick 22 away from the air flow channel 23 on one side of the adjacent brick 211 in the third direction D3 is provided with one second ejecting nozzle 132 and one second nozzle 13 (the second nozzle 13 is not provided with a second ejecting nozzle hole 1321), and the second ejecting nozzle 132 is located on the side of the second brick 22 away from the inner side wall 431, the side of the second brick 22 away from the air flow channel 23 on one side of the adjacent brick 211 in the fourth direction D4 is provided with one second ejecting nozzle 132 and one second nozzle 13 (the second nozzle 13 is not provided with a second ejecting nozzle hole 1321), and the second ejecting nozzle 132 is located on the side of the second brick 22 away from the inner side wall 431, and the two second ejecting nozzles 132 located at the two second bricks 22 are symmetrically arranged, and the two second nozzles 13 (the second nozzle 13 is not provided with a second ejecting nozzle hole 1321) located at the two second bricks 22 are symmetrically arranged. Each second brick 22 is provided with one first ejecting channel 221 and one second ejecting channel 222, that is, the number of the first ejecting channel 221 and the second ejecting channel 222 is two, and in this embodiment, the two first ejecting channels 221 are symmetrically arranged, and the two second ejecting channels 222 are symmetrically arranged.

[0062] Of course, in other embodiments, the number of the first nozzles 12 can also be two, four or five, etc., and some of the plurality of first nozzles 12 can be the first ejecting nozzles 122, or all of the first nozzles 12 can be the first ejecting nozzles 122, the number of the first ejecting channels 221 is determined according to the number of the first ejecting nozzles 122, which will not be repeated here. In other embodiments, the number of the second nozzles 13 can also be two, three or five, etc., and some of the plurality of second nozzles 13 can be the second ejecting nozzles 132, or all of the second nozzles 13 can be the second ejecting nozzles 132, the number of the second ejecting channels 222 is determined according to the number of the second ejecting nozzles 132, which will not be repeated here.

[0063] In this embodiment, as shown in FIG. 1, the first nozzles 12 are arranged on the first brick 21, and the second nozzles 13 are arranged on the second brick 22. Figure 3As shown, the number of the second bricks 22 is two, and each of the second bricks 22 is provided with a first ejector channel 221 and a second ejector channel 222. The first ejector channel 221 is tangent to the inner surface of the second brick 22 where the first ejector channel 221 is located, i.e. the surface of the second brick 22 facing the air flow channel 23, towards the inner wall of one end of the air flow channel 23, shortening the flow path of the mixed gas from the first ejector channel 221 to the position where the mixed gas starts to swirl and mix, so as to improve the mixing effect. The second ejector channel 222 is tangent to the inner surface of the second brick 22 where the second ejector channel 222 is located, towards the inner wall of one end of the air flow channel 23, shortening the flow path of the mixed gas from the second ejector channel 222 to the position where the mixed gas starts to swirl and mix, so as to improve the mixing effect. Of course, in other embodiments, the number of the second bricks 22 can also be two, and each of the second bricks 22 is provided with a first ejector channel 221 and a second ejector channel 222. The first ejector channel 221 is tangent to the inner surface of the second brick 22 where the first ejector channel 221 is not located, towards the inner wall of one end of the air flow channel 23. The second ejector channel 222 is tangent to the inner surface of the second brick 22 where the second ejector channel 222 is not located, towards the inner wall of one end of the air flow channel 23.

[0064] Optionally, the first spray head 12 is further provided with a third spray hole 123, which can spray the first fuel gas to the root of the flame 3, increase the delivery amount of the first fuel gas to the root of the flame 3, and achieve the effect of stabilizing the root of the flame 3. The second spray head 13 is further provided with a fourth spray hole 133, which can spray the second fuel gas to the root of the flame 3, increase the delivery amount of the second fuel gas to the root of the flame 3, and achieve the effect of stabilizing the root of the flame 3.

[0065] Further, the side of the adjacent brick body 211 away from the air flow channel 23 is provided with a first flame stabilizing groove 2111 extending to the end face of the end of the adjacent brick body 211 facing the flame 3, and the partial moving track of the first fuel gas sprayed from the third spray hole 123 is located in the first flame stabilizing groove 2111, that is, the first fuel gas sprayed from the third spray hole 123 first enters the first flame stabilizing groove 2111, then penetrates out of the first flame stabilizing groove 2111, and finally reaches the root of the flame 3, which can make the first flame stabilizing groove 2111 play a certain guiding role for the first fuel gas sprayed from the third spray hole 123, ensure that the first fuel gas sprayed from the third spray hole 123 can reach the root of the flame 3, and improve the reliability of the effect of stabilizing the root of the flame 3. The side of the second brick body 22 away from the air flow channel 23 is provided with a second flame stabilizing groove 223 extending to the end face of the end of the second brick body 22 facing the flame 3, and the partial moving track of the second fuel gas sprayed from the fourth spray hole 133 is located in the second flame stabilizing groove 223, that is, the second fuel gas sprayed from the fourth spray hole 133 first enters the second flame stabilizing groove 223, then penetrates out of the second flame stabilizing groove 223, and finally reaches the root of the flame 3, which can make the second flame stabilizing groove 223 play a certain guiding role for the second fuel gas sprayed from the fourth spray hole 133, ensure that the second fuel gas sprayed from the fourth spray hole 133 can reach the root of the flame 3, and improve the reliability of the effect of stabilizing the root of the flame 3.

[0066] The embodiment also provides a cracking furnace, and the furnace tube 7 of the cracking furnace has a low probability of being impacted by a flame.

[0067] Specifically, the cracking furnace comprises a furnace body (not shown in the figure), the furnace tube 7 and the burner described above, wherein the furnace body is provided with a furnace chamber 43, the furnace tube 7 and the burner brick are arranged in the furnace chamber 43, the furnace tube 7 is arranged on the side of the adjacent brick body 211 away from the air flow channel 23 and is spaced apart from the adjacent brick body 211, and the side of the fixed brick body 212 away from the air flow channel 23 is attached to the inner side wall 431 of the furnace chamber 43. The cracking furnace adopts the burner described above, and the special shape design of the first brick body 21 and the second brick body 22 makes the burner brick and the air flow channel 23 form a runway-shaped structure. Compared with the burner brick and the air flow channel in a circular structure, under the condition that the position of the inner side wall 431 of the furnace chamber 43, the position of the furnace tube 7 and the cross-sectional area of the air flow channel 23 are all the same, the runway-shaped air flow channel 23 can increase the distance between the flame 3 and the furnace tube 7, thereby reducing the probability of the flame 3 impacting the furnace tube 7 and reducing the probability of the furnace tube 7 having a local high temperature, thereby prolonging the operation cycle of the furnace tube 7 and the cracking furnace.

[0068] Further, the top of the furnace body is provided with an observation hole (not shown in the figure), and the direction from the top of the flame 3 to the observation hole is the first direction D1, so that whether the first burner 12 and the second burner 13 are blocked can be observed through the observation hole. Specifically, during the operation of the burner, the temperature of the burner brick is high, at this time the color of the burner brick is red, and the fuel gas commonly used by the burner is black gas fuel, that is, the first fuel gas and the second fuel gas are both black, and under the contrast of the red burner brick, the black first fuel gas and the black second fuel gas can be easily distinguished. Therefore, through the observation hole, whether there is a "first black line" (the "first black line" is the first fuel gas) in the area from the first burner 12 to the first flame stabilizing groove 2111 (or in the first flame stabilizing groove 2111) is observed, if there is a "first black line", it indicates that the first fuel gas is sprayed from the third spray hole 123, that is, the first burner 12 is not blocked; if there is no "first black line", it indicates that there is no first fuel gas sprayed from the third spray hole 123, that is, the first burner 12 is blocked. Through the observation hole, whether there is a "second black line" (the "second black line" is the second fuel gas) in the area from the second burner 13 to the second flame stabilizing groove 223 (or in the second flame stabilizing groove 223) is observed, if there is a "second black line", it indicates that the second fuel gas is sprayed from the fourth spray hole 133, that is, the second burner 13 is not blocked; if there is no "second black line", it indicates that there is no second fuel gas sprayed from the fourth spray hole 133, that is, the second burner 13 is blocked.

[0069] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A burner, characterized in that, The furnace includes burner bricks configured to be disposed within the furnace chamber (43) of a pyrolysis furnace. Each burner brick comprises two opposing first brick bodies (21) and two opposing second brick bodies (22), which together form an airflow channel (23). The first brick bodies (21) are flat, and the second brick bodies (22) are arc-shaped. The axes of both second brick bodies (22) are located within the airflow channel (23). Inside the airflow channel (23), one of the two first bricks (21) is an adjacent brick (211) and the other is a fixed brick (212). The furnace chamber (43) is provided with a furnace tube (7). The side of the adjacent brick (211) facing away from the airflow channel (23) is configured to be spaced apart from the furnace tube (7). The side of the fixed brick (212) facing away from the airflow channel (23) is used to fit against the inner wall (431) of the furnace chamber (43).

2. The burner according to claim 1, characterized in that, The burner also includes a first nozzle (12) and a second nozzle (13). The first nozzle (12) is located on the side of the adjacent brick (211) away from the air channel (23) and has a first nozzle (121). The second nozzle (13) is located on the side of the second brick (22) away from the air channel (23) and has a second nozzle (131). The first fuel gas ejected from the first nozzle (121) and the second fuel gas ejected from the second nozzle (131) can both mix with the combustion air flowing out of the air channel (23) to form a flame (3).

3. The burner according to claim 2, characterized in that, The first fuel gas is ejected along the direction of the first nozzle (121), and the axis of the first nozzle (121) is inclined toward the direction of the air flow channel (23).

4. The burner according to claim 3, characterized in that, The combustion air can flow in the air channel (23) along the first direction (D1), the first reference line (5) and the second reference line are both parallel to the first direction (D1), and the positive direction of the first reference line (5) and the positive direction of the second reference line are the same as the direction of the first direction (D1). The first reference line (5) intersects the axis of the first nozzle (121), and the first fuel gas is ejected along the direction of the first nozzle (121). The angle between the axis of the first nozzle (121) and the positive direction of the first reference line (5) is α. The second reference line intersects the axis of the second nozzle (131). Along the direction in which the second fuel gas is ejected from the second nozzle (131), the axis of the second nozzle (131) is inclined toward the direction of the air flow channel (23), and the angle between the axis of the second nozzle (131) and the positive direction of the second reference line is β, where α is greater than β.

5. The burner according to claim 2, characterized in that, The number of the first nozzles (12) is multiple, and at least one of the multiple first nozzles (12) is a first ejector nozzle (122). The second brick (22) is provided with a first ejector channel (221). One end of the first ejector channel (221) is connected to the air flow channel (23), and the other end is used to connect to the furnace (43). The first ejector nozzle (122) is provided with a first ejector nozzle (1221) on the side facing the first ejector channel (221). The first ejector nozzle (1221) is coaxial with the first ejector channel (221). There are multiple second nozzles (13), at least one of which is a second ejector nozzle (132). The second brick (22) is provided with a second ejector channel (222). One end of the second ejector channel (222) is connected to the air flow channel (23), and the other end is used to connect to the furnace (43). The second ejector nozzle (132) is provided with a second ejector nozzle (1321) on the side facing the second ejector channel (222). The second ejector nozzle (1321) is coaxial with the second ejector channel (222).

6. The burner according to claim 5, characterized in that, The first ejector channel (221) has one end facing the air channel (23) pointing to the side of the second brick (22) facing the air channel (23), and the second ejector channel (222) has one end facing the air channel (23) pointing to the side of the second brick (22) facing the air channel (23).

7. The burner according to claim 6, characterized in that, The inner wall of the first ejector channel (221) facing the air channel (23) is tangent to the surface of the second brick (22) facing the air channel (23), and the inner wall of the second ejector channel (222) facing the air channel (23) is tangent to the surface of the second brick (22) facing the air channel (23).

8. The burner according to claim 2, characterized in that, The first nozzle (12) is also provided with a third nozzle (123), which can spray the first fuel gas to the root of the flame (3). The second nozzle (13) is also provided with a fourth nozzle (133), which can spray the second fuel gas to the root of the flame (3).

9. The burner according to claim 8, characterized in that, The adjacent brick (211) is provided with a first flame stabilizing groove (2111) on the side away from the air flow channel (23). The first flame stabilizing groove (2111) extends to the end face of the adjacent brick (211) facing the flame (3). Part of the movement trajectory of the first fuel gas ejected from the third nozzle (123) is located in the first flame stabilizing groove (2111). The second brick (22) is provided with a second flame stabilizing groove (223) on the side away from the air flow channel (23). The second flame stabilizing groove (223) extends to the end face of the second brick (22) facing the flame (3). Part of the movement trajectory of the second fuel gas ejected from the fourth nozzle (133) is located in the second flame stabilizing groove (223).

10. A pyrolysis furnace, characterized in that, The furnace includes a furnace tube (7), a furnace chamber (43), and a burner as described in any one of claims 1-9. The furnace tube (7) and the burner brick are both disposed in the furnace chamber (43). The furnace tube (7) is located on the side of the adjacent brick (211) away from the air flow channel (23) and is spaced apart from the adjacent brick (211). The side of the fixed brick (212) away from the air flow channel (23) is in contact with the inner wall (431) of the furnace chamber (43).

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