A gas burner

Abstract

This invention belongs to the field of burner technology and discloses a gas burner. The gas burner includes a burner brick, a primary burner, and a secondary burner. The burner brick is fixed to the side wall of the reactor body and has a receiving hole and a protective groove. The receiving hole communicates with the interior of the reactor chamber, and the protective groove is located inside the furnace chamber. The primary nozzle of the primary burner is set in the receiving hole to protect the primary nozzle, and the secondary nozzle of the secondary burner is set in the protective groove to protect the secondary nozzle. This reduces the failure rate of the primary and secondary nozzles and provides a strong guarantee for the normal operation of the gas burner.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and more particularly to a gas burner. Background Technology

[0002] The cracking furnace is the most energy-consuming equipment in an ethylene plant, and the burner is a crucial component of it. The burner mixes fuel gas with air for combustion, where oxygen in the air reacts with hydrocarbons in the fuel gas, releasing a large amount of heat. During combustion under high temperature and excess oxygen conditions, nitrogen in the air reacts with oxygen to produce NOx, a harmful substance to the environment. NOx emissions are generally considered to be related to ozone depletion and other environmental problems.

[0003] To reduce NOx emissions from burners, existing technology discloses a burner comprising burner bricks, a primary diffusion burner, and a secondary diffusion burner. The burner bricks are fixed to the side wall of the pyrolysis furnace and have L-shaped channels. The horizontal section of the L-shaped channel is connected to the bellows, and the vertical section of the L-shaped channel is connected to the interior of the furnace. Combustion air is delivered from the bellows into the L-shaped channel and then into the interior of the furnace. The primary diffusion burner passes through the burner bricks, and its primary nozzle is located in the vertical section of the L-shaped channel. The secondary diffusion burner passes through the burner bricks, and its secondary nozzle is located inside the furnace, thereby forming staged combustion to reduce NOx emissions.

[0004] However, in practical applications, it has been found that the failure rate of the secondary nozzle is relatively high. This is because the secondary nozzle is exposed to the furnace for a long time, and the high-temperature flue gas in the furnace washes over the secondary nozzle for a long time. To address this problem, there is an urgent need to propose a gas burner. Summary of the Invention

[0005] The purpose of this invention is to provide a gas burner that can reduce the failure rate of the first-stage and second-stage nozzles.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A gas burner is provided for providing heat to a reactor. The gas burner includes a burner brick, a primary burner, and a secondary burner. The burner brick can be fixed to the side wall of the reactor body and has a receiving hole and a protective groove. The receiving hole communicates with the interior of the reactor chamber, and the protective groove is located inside the furnace chamber. The primary burner includes a primary nozzle, and the secondary burner includes a secondary nozzle. Both the primary nozzle and the secondary nozzle can inject flames into the interior of the furnace chamber. The primary nozzle is located in the receiving hole, and the secondary nozzle is located in the protective groove.

[0008] Optionally, the first-stage burner also includes a first-stage intake pipe and an ejector. One end of the first-stage intake pipe is connected to the first-stage nozzle, and the other end of the first-stage intake pipe is connected to the fuel gas source and the ejector, respectively. Combustion air enters the first-stage intake pipe through the ejector and mixes with the fuel gas in the first-stage intake pipe to form a mixed gas. The mixed gas is ejected from the first-stage nozzle and combusted to form a flame.

[0009] Optionally, the secondary burner is a diffusion burner, and the burner brick is also provided with a flow hole. The flow hole has a first end and a second end. The first end is connected to the air source, and the second end is connected to the inside of the furnace. The flow hole is used to supply combustion air to the secondary burner.

[0010] Optionally, the second end is disposed adjacent to the receiving hole.

[0011] Optionally, the port at the second end is positioned facing the receiving hole.

[0012] Optionally, the protective groove is formed on the side wall of the burner brick, and the height of the side wall of the protective groove closer to the inside of the furnace is lower than the height of the side wall of the other side.

[0013] Optionally, the number of secondary burners may be multiple.

[0014] Optionally, multiple secondary nozzles are spaced apart, and the gas burner also includes a baffle, which is disposed between two adjacent secondary nozzles and can block the flames ejected by the two adjacent secondary nozzles.

[0015] Optionally, the partition extends from one edge of the protective groove to the other edge of the protective groove.

[0016] Optionally, the burner brick is also provided with flame stabilizing holes, which are arranged adjacent to the protective groove and / or receiving hole.

[0017] Beneficial effects:

[0018] The gas burner provided by this invention has a receiving hole and a protective groove on the burner brick. The receiving hole is connected to the inside of the furnace of the reactor, and the protective groove is located inside the furnace. The first-stage nozzle of the first-stage burner is placed in the receiving hole, and the second-stage nozzle of the second-stage burner is placed in the protective groove. This allows the first-stage and second-stage nozzles to spray flames into the furnace, while the receiving hole and protective groove protect the first-stage and second-stage nozzles respectively. This reduces the probability of the high-temperature flue gas in the furnace scouring the first-stage and second-stage nozzles, thereby reducing the failure rate of the first-stage and second-stage nozzles and providing a strong guarantee for the normal operation of the gas burner. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the gas burner provided in this embodiment;

[0020] Figure 2 yes Figure 1 Sectional view in the middle AA direction Figure 1 ;

[0021] Figure 3 yes Figure 1 Sectional view in the middle AA direction Figure 2 .

[0022] In the picture:

[0023] 10. Furnace body sidewall; 100. Burner brick; 110. Receiving hole; 120. Protective groove; 130. Flow hole; 131. First end; 132. Second end; 140. Flame stabilizing hole; 141. First flame stabilizing hole; 142. Second flame stabilizing hole; 210. Primary nozzle; 220. Primary air inlet pipe; 230. Ejector; 310. Secondary nozzle; 320. Secondary air inlet pipe; 400. Baffle. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0025] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0028] This embodiment provides a gas burner for providing heat to a reactor, and the failure rate of the primary and secondary nozzles of the gas burner is low.

[0029] Specifically, such as Figure 1 and Figure 2 As shown, the gas burner includes a burner brick 100, a primary burner, and a secondary burner. The burner brick 100 can be fixed to the side wall 10 of the reactor body, and the burner brick 100 is provided with a receiving hole 110 and a protective groove 120. The receiving hole 110 communicates with the interior of the reactor chamber, and the protective groove 120 is located inside the furnace chamber. The primary burner includes a primary nozzle 210, and the secondary burner includes a secondary nozzle 310. Both the primary nozzle 210 and the secondary nozzle 310 can spray flames into the interior of the furnace chamber. The primary nozzle 210 is disposed in the receiving hole 110, and the secondary nozzle 310 is placed in the protective groove 120.

[0030] This gas burner places the primary burner nozzle 210 in the receiving hole 110 and the secondary burner nozzle 310 in the protective groove 120. This allows the primary burner nozzle 210 and the secondary burner nozzle 310 to spray flames into the furnace, while the receiving hole 110 and the protective groove 120 protect the primary burner nozzle 210 and the secondary burner nozzle 310 respectively. This reduces the probability of the high-temperature flue gas in the furnace scouring the primary burner nozzle 210 and the secondary burner nozzle 310, thereby reducing the failure rate of the primary burner nozzle 210 and the secondary burner nozzle 310 and providing a strong guarantee for the normal operation of the gas burner.

[0031] Optionally, such as Figure 1 and Figure 2As shown, the secondary burner is a diffusion burner. Specifically, the secondary burner also includes a secondary air inlet pipe 320. One end of the secondary air inlet pipe 320 is connected to the fuel gas source, and the other end is connected to the secondary nozzle 310. The burner brick 100 is also provided with a flow hole 130, which has a first end 131 and a second end 132. The first end 131 is connected to the air source, and the second end 132 is connected to the interior of the furnace. The combustion air output from the air source enters the interior of the furnace through the flow hole 130. Then, the combustion air mixes and burns with the fuel gas sprayed from the secondary nozzle 310 to form a flame. The diffusion burner can spray a longer flame, making the gas burner more suitable for the use of large-scale, long-flame applications. Furthermore, the NOx emission of the diffusion burner is lower, which can reduce the overall NOx emission of the gas burner. It should be noted that the specific structure of the diffusion burner is a common structure in this technical field and will not be described in detail here.

[0032] Optionally, in the technical solution provided in this embodiment, the primary burner is a premixed burner, specifically, as shown in... Figure 1 and Figure 2As shown, the first-stage burner also includes a first-stage intake pipe 220 and an ejector 230. One end of the first-stage intake pipe 220 is connected to the first-stage nozzle 210, and the other end of the first-stage intake pipe 220 is connected to the fuel gas source and the ejector 230 respectively. The fuel gas source introduces fuel gas into the first-stage intake pipe 220, and the combustion air enters the first-stage intake pipe 220 through the ejector 230. In the first-stage intake pipe 220, the fuel gas and the combustion air mix to form a mixed gas, which is then ejected from the first-stage nozzle 210 and burned to form a flame. In existing technologies, primary burners typically employ diffusion burners, where the nozzles only inject fuel gas. After injection, the fuel gas mixes with the surrounding combustion air and burns simultaneously. At this point, the combustion air concentration at the flame root (near the nozzle) is low, creating a lean-fuel combustion zone. Consequently, the flame stability at the flame root is low, affecting the overall flame stability. This phenomenon is particularly pronounced when the primary burner operates at low load, severely reducing the heat supplied to the reactor by the gas burner. To address this problem, the technical solution provided in this embodiment employs a premixed burner. The fuel gas and combustion air mix within the primary inlet pipe 220 to form a mixed gas before being injected and burned by the primary nozzle 210. This solves the problem of low combustion air concentration at the flame root (near the primary nozzle 210), improving the stability of the flame root injected by the primary nozzle 210, and thus enhancing the overall flame stability. Even when the primary burner operates at low load, the flame in this area maintains high stability. In the technical solution provided in this embodiment, the primary burner adopts a premixed burner, and the secondary burner adopts a diffusion burner. This enables the gas burner to achieve both long flame combustion and improved flame stability during low-load operation, effectively enhancing the overall performance of the gas burner. It should be noted that the specific structure of the premixed burner is a common structure in this technical field and will not be described in detail here.

[0033] Preferably, such as Figure 1 and Figure 2As shown, the second end 132 of the flow hole 130 is arranged adjacent to the receiving hole 110. Combustion air enters the flow hole 130 from the first end 131 and exits from the flow hole 130 from the second end 132. By positioning the second end 132 adjacent to the receiving hole 110, the combustion air exiting from the second end 132 can not only mix and burn with the fuel gas ejected by the secondary nozzle 310, but also cool the environment around the primary nozzle 210 in the receiving hole 110, thereby reducing the ambient temperature around the flame ejected by the primary nozzle 210, thus reducing the NOx emissions of the primary burner and the overall NOx emissions of the gas burner. On the other hand, in this embodiment, by positioning the second end 132 of the flow hole 130 adjacent to the receiving hole 110, the ambient temperature around the primary nozzle 210 can be reduced, eliminating the need for a cooling device, thereby simplifying the overall structure of the gas burner and reducing the installation space of the gas burner.

[0034] Preferably, the port of the second end 132 is positioned facing the receiving hole 110 to further improve the cooling capacity of the combustion air discharged from the second end 132, thereby further reducing NOx emissions from the first-stage burner. Further, as... Figure 3 As shown, the angle α between the axis of the second end 132 and the axis of the receiving hole 110 is in the range of 3°-10°. For example, the angle α can be 3°, 5° or 10°, so that the combustion air discharged from the second end 132 can cool the environment around the first-stage nozzle 210 without affecting the flame ejected by the first-stage nozzle 210.

[0035] Optionally, such as Figure 1 and Figure 2 As shown, the protective groove 120 is formed on the side wall of the burner brick 100, and the height of the side wall of the protective groove 120 closer to the inside of the furnace is lower than the height of the side wall of the other side, so that the secondary nozzle 310 can spray flame into the furnace.

[0036] Furthermore, such as Figure 1 and Figure 2 As shown, the receiving hole 110 is opened on the top of the burner brick 100 to separate the primary nozzle 210 and the secondary nozzle 310, so as to avoid the flames ejected by the two nozzles from interfering with each other and improve the stability of the flames ejected by the primary nozzle 210 and the flames ejected by the secondary nozzle 310.

[0037] Optionally, such as Figure 1 and Figure 2 As shown, there are multiple secondary burners to increase the heat supplied by the gas burners to the reactor.

[0038] Furthermore, such as Figure 1 and Figure 2As shown, multiple secondary nozzles 310 are spaced apart. The gas burner also includes a baffle 400, which is disposed between two adjacent secondary nozzles 310. The baffle 400 can block the flames ejected by two adjacent secondary nozzles 310 to avoid mutual interference between the flames ejected by the two adjacent secondary nozzles 310, thereby improving the stability of the flames ejected by multiple secondary nozzles 310.

[0039] Preferably, such as Figure 1 and Figure 2 As shown, the baffle 400 extends from one side edge of the protective groove 120 to the other side edge of the protective groove 120, thereby forming a baffle structure. This not only blocks the flames ejected by the two adjacent secondary nozzles 310, but also improves the structural strength of the two side walls of the protective groove 120, especially the side wall with the lower height. This improves the reliability of the protective groove 120 in protecting the secondary nozzles 310 and further reduces the failure rate of the secondary nozzles 310.

[0040] Optionally, the number of primary burners is multiple to increase the heat supplied by the gas burners to the reactor. Furthermore, the multiple primary burners are spaced apart to avoid interference between the flames ejected by adjacent primary nozzles 210, thereby improving the stability of the flames ejected by the multiple primary nozzles 210.

[0041] Optionally, such as Figure 1 and Figure 2 As shown, in the technical solution provided in this embodiment, the burner brick 100 is also provided with a flame stabilizing hole 140, which is arranged adjacent to the protective groove 120. This expands the contact area between the burner brick 100 and the flame ejected by the secondary nozzle 310 in the protective groove 120, thereby increasing the ambient temperature around the secondary nozzle 310 and improving the root stability of the flame ejected by the secondary nozzle 310. In this embodiment, the flame stabilizing hole 140 is only opened at the position adjacent to the protective groove 120, and not at the position adjacent to the receiving hole 110. The purpose is to ensure the cooling effect of the combustion air discharged from the second end 132 on the environment around the primary nozzle 210. Of course, in other embodiments, the flame stabilizing hole 140 can also be set near the receiving hole 110, that is, to increase the contact area between the burner brick 100 and the flame sprayed by the first-stage nozzle 210; or, the flame stabilizing hole 140 can be opened at the positions adjacent to the receiving hole 110 and the protective groove 120, thereby increasing the contact area between the burner brick 100 and the flame sprayed by the first-stage nozzle 210 and the flame sprayed by the second-stage nozzle 310, depending on the actual needs.

[0042] Preferably, such as Figure 1 and Figure 2As shown, the flame stabilizing hole 140 includes a first flame stabilizing hole 141 and a second flame stabilizing hole 142. The first flame stabilizing hole 141 and the protective groove 120 are located on the same side of the burner brick 100. The second flame stabilizing hole 142 is located on the top of the burner brick 100 and close to the first flame stabilizing hole 141. It expands the contact area between the burner brick 100 and the flame ejected by the secondary nozzle 310 in two directions, further increasing the ambient temperature around the secondary nozzle 310, so as to further improve the stability of the root of the flame ejected by the secondary nozzle 310.

[0043] Furthermore, such as Figure 1 and Figure 2 As shown, the first flame stabilizing hole 141 is a stepped hole, and the large-diameter end of the stepped hole is far away from the interior of the furnace. The diameter of the first flame stabilizing hole 141 is increased at the position far away from the interior of the furnace to expand the contact area between the hole wall of the first flame stabilizing hole 141 (i.e., the burner brick 100) and the flame sprayed by the secondary nozzle 310 at this position, thereby further increasing the ambient temperature around the secondary nozzle 310 and further improving the stability of the root of the flame sprayed by the secondary nozzle 310.

[0044] The gas burner provided in this embodiment employs a premixed burner in its primary stage. Fuel gas and combustion air are mixed in the primary inlet pipe 220 to form a mixed gas, which is then ejected and burned by the primary nozzle 210. This creates a stable flame combustion zone at the primary nozzle 210, improving the stability of the flame ejected by the primary nozzle 210. A flame stabilizing hole 140 is formed on the burner brick 100, positioned adjacent to the protective groove 120. This expands the contact area between the burner brick 100 and the flame ejected by the secondary nozzle 310 within the protective groove 120, thereby improving the root stability of the flame ejected by the secondary nozzle 310. A partition 400 is provided between two adjacent secondary nozzles 310 to prevent interference between their flames, further enhancing the stability of the flame ejected by the secondary nozzle 310. Therefore, the overall flame stability of the gas burner is high, thus improving the stability of the gas burner's heat supply to the reactor. Secondly, by positioning the second end 132 of the flow hole 130 adjacent to the receiving hole 110, the combustion-supporting gas discharged from the second end 132 cools the environment around the primary nozzle 210 within the receiving hole 110, reducing NOx emissions from the primary burner and consequently reducing overall NOx emissions from the gas burner. Thirdly, in this embodiment, the primary nozzle 210 of the primary burner is positioned within the receiving hole 110, and the secondary nozzle 310 of the secondary burner is positioned within the protective groove 120. This achieves protection for both the primary and secondary nozzles 210, reducing the likelihood of high-temperature flue gas scouring them and thus lowering their failure rate, providing strong assurance for the normal operation of the gas burner.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A gas burner for providing heat to a reactor, characterized in that, The gas burner includes a burner brick (100), a primary burner, and a secondary burner. The burner brick (100) can be fixed to the side wall (10) of the reactor body. The burner brick (100) is provided with a receiving hole (110) and a protective groove (120). The receiving hole (110) communicates with the interior of the furnace chamber of the reactor. The protective groove (120) is located inside the furnace chamber. The primary burner includes a primary nozzle (210), and the secondary burner includes a secondary nozzle (310). Both the primary nozzle (210) and the secondary nozzle (310) can spray flames into the interior of the furnace chamber. The primary nozzle (210) is disposed in the receiving hole (110), and the secondary nozzle (310) is placed in the protective groove (120). The primary burner also includes a primary intake pipe (220) and an ejector (230). One end of the primary intake pipe (220) is connected to the primary nozzle (210), and the other end of the primary intake pipe (220) is connected to the fuel gas source and the ejector (230) respectively. Combustion air enters the primary intake pipe (220) through the ejector (230) and mixes with the fuel gas in the primary intake pipe (220) to form a mixed gas. The mixed gas is ejected from the primary nozzle (210) and combusts to form the flame. The secondary burner is a diffusion burner, and the burner brick (100) is also provided with a flow hole (130). The flow hole (130) has a first end (131) and a second end (132). The first end (131) is connected to the air source, and the second end (132) is connected to the interior of the furnace. The flow hole (130) is used to supply the combustion air to the secondary burner. The second end (132) is disposed adjacent to the receiving hole (110), and the included angle α between the axis of the second end (132) and the axis of the receiving hole (110) is in the range of 3°-10°.

2. The gas burner according to claim 1, characterized in that, The port of the second end (132) is positioned facing the receiving hole (110).

3. The gas burner according to any one of claims 1-2, characterized in that, The protective groove (120) is formed on the side wall of the burner brick (100), and the height of the side wall of the protective groove (120) closer to the inside of the furnace is lower than the height of the side wall on the other side.

4. The gas burner according to claim 3, characterized in that, The number of secondary burners is multiple.

5. The gas burner according to claim 4, characterized in that, The gas burner further includes a baffle (400) spaced apart from each other, and the baffle (400) is disposed between two adjacent secondary nozzles (310). The baffle (400) is capable of blocking the flames ejected by the two adjacent secondary nozzles (310).

6. The gas burner according to claim 5, characterized in that, The partition (400) extends from one side edge of the protective groove (120) to the other side edge of the protective groove (120).

7. The gas burner according to any one of claims 1-2, characterized in that, The burner brick (100) is also provided with a flame stabilizing hole (140), which is arranged adjacent to the protective groove (120) and / or the receiving hole (110).

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