Low NOx combustion in a cracking furnace x Combustor and method for treating flue gas

Abstract

The application belongs to the technical field of chemical energy and environmental protection, and discloses a low-NO X The application discloses a burner and a treatment method of char gas. The burner comprises a burner brick, a char gas inlet pipe and a fuel gas inlet pipe. The burner brick is provided with a gas flow channel which is communicated with a furnace chamber of a cracking furnace. The burner brick is fixed on a furnace body of the cracking furnace. Combustion-supporting gas enters the furnace chamber through the gas flow channel. Two ends of the char gas inlet pipe are respectively communicated with a char gas source and the gas flow channel. Two ends of the fuel gas inlet pipe are respectively communicated with a fuel gas source and the furnace chamber. The char gas, the combustion-supporting gas and the fuel gas are mixed and combusted in the furnace chamber, so that combustible particulate matters in the char gas are combusted, and the effect of reducing particulate matters in the char gas is achieved.

Description

Technical Field

[0001] This invention relates to the field of chemical energy and environmental protection technology, and in particular to a low-NOx material for pyrolysis furnaces. X Burner and coke gas treatment methods. Background Technology

[0002] The cracking furnace is the core device for ethylene production. In actual operation, as the operating time of the cracking furnace increases, coke will form inside the furnace tubes. If this coke is not treated in time, it will increase the energy consumption and raw material consumption of the cracking furnace, shorten the service life and operating cycle of the cracking furnace. Therefore, it is necessary to perform coke burning treatment.

[0003] Coking treatment typically involves introducing steam or a mixture of steam and air into the furnace tubes of a pyrolysis furnace. At a certain temperature, the coke scale is decomposed and removed from the furnace tubes. During this process, the pyrolysis furnace generates a large amount of coking gas, which mainly contains steam, particulate matter (coke powder, rust, etc.), and pollutants such as CO2. Directly releasing the coking gas into the atmosphere is very detrimental to environmental protection. Furthermore, the coking gas (approximately 100℃-400℃) contains a large amount of waste heat, which cannot be utilized if it is directly released into the atmosphere.

[0004] In existing technologies, coking gas is usually introduced into a coking canister to separate particulate matter from the coking gas. The coking gas is then discharged into the atmosphere or introduced into the furnace of a pyrolysis furnace, thereby achieving the treatment of particulate matter in the coking gas and the utilization of waste heat.

[0005] However, coking tanks often cannot completely separate particulate matter from the coking gas, and some particulate matter remains incompletely burned in the furnace of the pyrolysis furnace. The remaining particulate matter discharged from the furnace into the atmosphere still poses an environmental pollution problem, and the remaining particulate matter is prone to causing ash accumulation in the furnace of the pyrolysis furnace.

[0006] Therefore, how to reduce particulate matter in coking gas is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] One object of the present invention is to provide a low NO content in a pyrolysis furnace. X The burner can burn the combustible particulate matter in the coke gas, thereby reducing the particulate matter in the coke gas.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] A low NO content in a pyrolysis furnace X The burner, pyrolysis furnace includes a furnace body, the furnace body is provided with a furnace chamber, and a low NO content is present in the pyrolysis furnace. X The burner includes:

[0010] Burner bricks can be fixed on the furnace body. The burner bricks are equipped with gas channels that can communicate with the furnace chamber, allowing combustion gases to enter the furnace chamber through the gas channels.

[0011] The coke gas inlet pipe has one end connected to the coke gas source and the other end connected to the gas flow channel.

[0012] The fuel inlet pipe has one end connected to the fuel gas source and the other end connected to the furnace.

[0013] Optionally, a coking gas nozzle is provided at the other end of the coking gas inlet pipe.

[0014] Optionally, the gas flow channel has an inlet end and an outlet end. The combustion gas enters the gas flow channel through the inlet end, and the coking gas nozzle is placed at the inlet end or between the inlet end and the outlet end. The outlet end is placed inside the furnace.

[0015] Optionally, a fuel nozzle is provided at the other end of the fuel inlet pipe, and the fuel nozzle is located inside the furnace.

[0016] Optionally, there are multiple fuel nozzles, and the fuel gas ejected from the multiple fuel nozzles burns to form a combustion flame.

[0017] Optionally, multiple fuel nozzles are arranged around the coke gas nozzle, and the coke gas ejected from the coke gas nozzle can enter the high-temperature combustion zone of the combustion flame.

[0018] Optionally, the burner also includes a bellows, which is connected to a gas flow channel and is used to introduce combustion-supporting gas into the gas flow channel.

[0019] Optionally, the coking gas inlet pipe is installed through the bellows.

[0020] Another objective of this invention is to provide a method for treating coke gas that can burn combustible particulate matter in the coke gas, thereby reducing the amount of combustible particulate matter in the coke gas.

[0021] To achieve this objective, the present invention adopts the following technical solution:

[0022] The method for treating coke gas involves using a burner to burn the combustible particles in the coke gas inside the furnace of a pyrolysis furnace, and then allowing the coke gas to be discharged from the furnace along with the flue gas from the pyrolysis furnace.

[0023] Optionally, coking gas can be introduced into the high-temperature combustion zone of the burner flame.

[0024] Beneficial effects:

[0025] The present invention provides a low NO content in the pyrolysis furnace. XThe burner includes burner bricks that can be fixed to the pyrolysis furnace body. Gas channels are opened on the burner bricks, through which the combustion-supporting gas can enter the furnace chamber of the pyrolysis furnace. One end of the coke gas inlet pipe is connected to the coke gas source, and the other end of the coke gas inlet pipe is connected to the gas channels, so that the coke gas can enter the furnace chamber of the pyrolysis furnace in sequence through the coke gas inlet pipe and the gas channels. In the gas channels, the combustion-supporting gas and the coke gas are mixed. In the furnace chamber of the pyrolysis furnace, the combustion-supporting gas mixed with the coke gas is mixed with the fuel gas and burned, so that the combustible particulate matter in the coke gas is burned, thereby achieving the effect of reducing the combustible particulate matter in the coke gas.

[0026] The coking gas treatment method provided by the present invention uses a burner to burn the combustible particulate matter in the coking gas in the furnace of a pyrolysis furnace, thereby reducing the combustible particulate matter in the coking gas. The coking gas is then discharged from the furnace along with the flue gas from the pyrolysis furnace, which is conducive to environmental protection. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the burner structure provided by the present invention. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the burner structure provided by the present invention. Figure 2 .

[0029] In the picture:

[0030] 100. Furnace body; 110. Furnace chamber; 200. Burner brick; 210. Gas flow channel; 211. Gas inlet end; 212. Gas outlet end; 300. Coke gas inlet pipe; 310. Coke gas nozzle; 400. Fuel inlet pipe; 410. Fuel nozzle; 500. Bellows; 600. Air regulator. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] This embodiment provides a low-NOx content in a pyrolysis furnace. X The burner can burn combustible particulate matter in the coke oven gas, thereby reducing the particulate matter in the coke oven gas and lowering the NO content of the burner. X The emissions contribute to environmental protection.

[0036] Specifically, such as Figure 1 and Figure 2 As shown, the above-mentioned pyrolysis furnace includes a furnace body 100, and the furnace body 100 is provided with a furnace chamber 110. A low-NOx content is introduced into the pyrolysis furnace. X The burner includes a burner brick 200, a coke gas inlet pipe 300, and a fuel inlet pipe 400. The burner brick 200 can be fixed on the furnace body 100. The burner brick 200 is provided with a gas flow channel 210, which can be connected to the furnace 110. The combustion gas can enter the furnace 110 through the gas flow channel 210. One end of the coke gas inlet pipe 300 is used to connect to the coke gas source, and the other end of the coke gas inlet pipe 300 is connected to the gas flow channel 210. One end of the fuel inlet pipe 400 is used to connect to the fuel gas source, and the other end of the fuel inlet pipe 400 can be connected to the furnace 110.

[0037] A low-NOx content in the pyrolysis furnace XThe burner is equipped with a coke gas inlet pipe 300 connected to a coke gas source, and a gas flow channel 210 is formed on the burner brick 200 to allow combustion-supporting gas to be introduced into the furnace 110. One end of the coke gas inlet pipe 300 is connected to the coke gas source, and the other end is connected to the gas flow channel 210. Within the gas flow channel 210, the combustion-supporting gas and coke gas mix. Within the furnace 110, the combustion-supporting gas and fuel gas mix and burn, causing the combustible particulate matter in the coke gas to burn, thereby reducing the amount of combustible particulate matter in the coke gas. Simultaneously, introducing the coke gas into the furnace 110 of the pyrolysis furnace also achieves the effect of recovering and utilizing the waste heat of the coke gas itself, thus realizing full utilization of energy. It should be noted that the aforementioned coke gas source can be a coke burner, i.e., the furnace tubes of the pyrolysis furnace are connected to the coke burner, and the coke burner is connected to the coke gas inlet pipe 300; the aforementioned coke gas source can also be other coke gas treatment units.

[0038] Optionally, such as Figure 1 and Figure 2 As shown, the other end of the coking gas inlet pipe 300 is provided with a coking gas nozzle 310. The coking gas is injected into the gas flow channel 210 through the coking gas nozzle 310, so that the combustible particles in the coking gas can diffuse into the gas flow channel 210.

[0039] Furthermore, such as Figure 1 and Figure 2 As shown, the gas flow channel 210 has an inlet end 211 and an outlet end 212. The combustion-supporting gas enters the gas flow channel 210 through the inlet end 211. The coking gas nozzle 310 is positioned at the inlet end 211 or between the inlet end 211 and the outlet end 212. The outlet end 212 is located inside the furnace 110. This extends the flow path of the coking gas within the gas flow channel 210, improving the uniformity of mixing between the coking gas and the combustion-supporting gas within the gas flow channel 210. Consequently, the combustible particles in the coking gas entering the furnace 110 can burn more evenly and completely, enhancing the burner's ability to handle combustible particles in the coking gas and further reducing the amount of combustible particles in the coking gas. Of course, in other embodiments, the coking gas nozzle 310 can also be positioned at the outlet end 212, depending on the actual application.

[0040] Optionally, such as Figure 1 and Figure 2 As shown, the other end of the fuel inlet pipe 400 is provided with a fuel nozzle 410, which is located inside the furnace 110. Fuel gas is injected into the furnace 110 through the fuel nozzle 410.

[0041] Furthermore, such as Figure 1 and Figure 2 As shown, there are multiple fuel nozzles 410, and the fuel gas ejected from the multiple fuel nozzles 410 burns to form a combustion flame.

[0042] Preferably, such as Figure 1 and Figure 2 As shown, multiple fuel nozzles 410 are arranged around the coke gas nozzle 310, so that the coke gas ejected from the coke gas nozzle 310 is located in the middle of the multiple fuel nozzles 410, and the injection direction of the fuel nozzles 410 matches the injection direction of the coke gas nozzle 310. As a result, the coke gas ejected from the coke gas nozzle 310 can enter the high-temperature combustion zone of the combustion flame, which is conducive to the complete combustion of combustible particles in the coke gas and also helps to cool down the high-temperature combustion zone, thereby reducing the nitrogen oxide emissions of the burner and benefiting the environment. It should be noted that the matching of the injection direction of the fuel nozzle 410 and the coke gas nozzle 310 means that the injection directions of the fuel nozzle 410 and the coke gas nozzle 310 are set at an acute angle, so that the coke gas ejected from the coke gas nozzle 310 can be injected into the high-temperature combustion zone of the combustion flame. Specifically, the angle between the injection directions of the fuel nozzle 410 and the coke gas nozzle 310 can be determined by computational fluid dynamics (CFD) simulation. It should also be noted that in this embodiment, the injection direction of the coke gas nozzle 310 is parallel to the axis of the gas flow channel 210. In other embodiments, if the injection direction of the coke gas nozzle 310 is not parallel to the axis of the gas flow channel 210, the coke gas nozzle 310 can be placed at the outlet end 212 of the gas flow channel 210.

[0043] Furthermore, such as Figure 1 and Figure 2 As shown, there are multiple coking gas nozzles 310 to increase the amount of coking gas introduced into the high-temperature combustion zone, improve the efficiency of treating combustible particulate matter in the coking gas, and further reduce the temperature of the high-temperature combustion zone, thereby further reducing the nitrogen oxide emissions of the burner.

[0044] Optionally, such as Figure 1 and Figure 2 As shown, the burner also includes a wind box 500, which is connected to the gas flow channel 210. The wind box 500 is used to introduce combustion-supporting gas into the gas flow channel 210. Furthermore, the burner also includes an air regulator 600, which is connected to the wind box 500 and is used to introduce combustion-supporting gas into the wind box 500.

[0045] Optionally, such as Figure 1 and Figure 2 As shown, the coke gas inlet pipe 300 is installed in the air box 500, which reduces the overall space occupied by the burner and eliminates the need to install the coke gas inlet pipe 300 on the burner brick 200. This simplifies the burner's production process and helps improve the burner's production efficiency.

[0046] It should be noted that the arrangement and injection direction of the fuel nozzle 410, the arrangement and injection direction of the coking gas nozzle 310, and the design of the gas flow channel 210 can be determined by computational fluid dynamics (CFD) simulation.

[0047] This embodiment also provides a method for treating coke gas, which can burn the combustible particulate matter in the coke gas, thereby reducing the particulate matter in the coke gas.

[0048] Specifically, the method for treating the coke gas includes: burning the combustible particulate matter in the coke gas in the furnace of a pyrolysis furnace using a burner, and then discharging the coke gas from the furnace along with the flue gas from the pyrolysis furnace, thereby reducing the combustible particulate matter in the coke gas and improving environmental protection. Furthermore, burning the coke gas in the furnace allows the pyrolysis furnace to recover and utilize the waste heat carried by the coke gas itself, improving energy efficiency. It is understood that, since the burner provided in this embodiment is equipped with a coke gas inlet pipe 300, the above treatment method preferably employs a low-NOx gas treatment process from the pyrolysis furnace provided in this embodiment. X Burner.

[0049] Preferably, coke gas is introduced into the high-temperature combustion zone of the burner flame. The high-temperature combustion zone is conducive to the complete combustion of combustible particles in the coke gas, thereby improving the treatment efficiency of combustible particles in the coke gas. Furthermore, the temperature of the coke gas is usually 100℃-400℃, while the temperature of the high-temperature combustion zone of the burner is much higher than that of the coke gas. Introducing coke gas into the high-temperature combustion zone of the burner is beneficial to cooling the high-temperature combustion zone, thereby reducing the nitrogen oxide emissions of the burner.

[0050] 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 low-NOx content in a pyrolysis furnace X The burner, the pyrolysis furnace including a furnace body (100), the furnace body (100) being provided with a furnace chamber (110), is characterized in that, The pyrolysis furnace contains a low NO X The burner includes: Burner brick (200), the burner brick (200) can be fixed on the furnace body (100), the burner brick (200) is provided with a gas flow channel (210), the gas flow channel (210) can communicate with the furnace chamber (110), and the combustion gas can enter the furnace chamber (110) through the gas flow channel (210); A coke gas inlet pipe (300) is provided, one end of which is connected to a coke gas source, and the other end of which is connected to the gas flow channel (210). A fuel inlet pipe (400) is provided, one end of which is connected to a fuel gas source, and the other end of which is connected to the furnace (110). The other end of the coking gas inlet pipe (300) is provided with a coking gas nozzle (310); The other end of the fuel inlet pipe (400) is provided with a fuel nozzle (410), which is located inside the furnace (110); The number of fuel nozzles (410) is multiple, and the fuel gas ejected from the multiple fuel nozzles (410) is burned to form a combustion flame; Multiple fuel nozzles (410) are arranged around the coking gas nozzle (310), and the coking gas ejected from the coking gas nozzle (310) can enter the high-temperature combustion zone of the combustion flame and cool the high-temperature combustion zone.

2. A low-NOx content in the pyrolysis furnace according to claim 1 X The burner is characterized in that, The gas flow channel (210) has an inlet end (211) and an outlet end (212). The combustion gas enters the gas flow channel (210) through the inlet end (211). The coking gas nozzle (310) is located at the inlet end (211) or between the inlet end (211) and the outlet end (212). The outlet end (212) is located inside the furnace (110).

3. A low-NOx content in the pyrolysis furnace according to any one of claims 1-2 X The burner is characterized in that, The burner also includes a bellows (500) which is connected to the gas flow channel (210) and is used to introduce the combustion-supporting gas into the gas flow channel (210).

4. A low-NOx content in the pyrolysis furnace according to claim 3 X The burner is characterized in that, The coke gas inlet pipe (300) is inserted through the bellows (500).

5. A method for treating coke gas, applied in a low-NOx environment in the pyrolysis furnace described in claim 1. X The burner is characterized in that, The combustible particulate matter in the coke gas is burned in the furnace of the pyrolysis furnace using the burner, and then the coke gas is discharged from the furnace along with the flue gas from the pyrolysis furnace.

6. The method for treating coke gas according to claim 5, characterized in that, The coking gas is introduced into the high-temperature combustion zone of the burner flame.

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