Combustor and heating furnace heat supply system for high-concentration organic waste gas pyrolysis at high temperature

Abstract

The application discloses a combustor and heating furnace heat supply system for high-concentration organic waste gas high-temperature pyrolysis, wherein the combustor for high-concentration organic waste gas high-temperature pyrolysis comprises a combustor main body, one end of the combustor main body is a combustion end, at least three air passage channels are formed in the combustion end, the three air passage channels comprise a first air passage channel, a second air passage channel and a third air passage channel which are sequentially arranged along the radial direction from inside to outside, the first air passage channel is used for connecting waste gas, the second air passage channel is used for connecting combustion-supporting air, and the third air passage channel is used for connecting fuel gas. In the technical scheme, the pressure difference and pressure fluctuation of the fuel gas and the waste gas do not affect each other, the combustor for high-concentration organic waste gas high-temperature pyrolysis ensures that the waste gas can be fully combusted in a limited space, and the high-concentration organic waste gas can be fully decomposed.

Description

Technical Field

[0001] The present invention relates to the technical field of heating furnace heating, and in particular to a burner for high-temperature pyrolysis of high-concentration organic waste gas and a heating furnace heating system. Background Art

[0002] Coking and tar processing plants typically treat high and low concentration organic waste gases by introducing them into a scrubber, where they are washed with wash oil before being discharged. This method can adsorb some of the organic matter in the waste gas into the wash oil, but the waste gas discharged from the scrubber still contains organic matter, making the scrubbing process incomplete and still polluting the environment. In recent years, coking and tar processing plants have begun considering high-temperature thermal oxidation to treat this organic waste gas. This involves utilizing existing heating furnaces, which generate flames by burning fuel gas to provide heat to the process medium. The furnaces incinerate the organic waste gas using the high temperature and heat of the flame, converting it into CO2 and H2O for discharge, while also recovering the chemical energy stored in the waste gas. The device that provides gas combustion to generate flame for the heating furnace is called a burner. The burner configured in the traditional heating furnace does not take into account the function of burning organic waste gas. Due to its own characteristics, organic waste gas cannot directly replace the original fuel gas, otherwise it will affect the main function of the heating furnace to provide heat source. Therefore, the burner of the existing heating furnace needs to be replaced so that it can not only burn the fuel gas to provide the heat required by the heating furnace, but also use the high temperature of the flame to completely decompose the organic waste gas.

[0003] The primary function of a burner is to release the chemical energy of the fuel, providing the required heat for the furnace. The pressure and flow of fuel gas are typically relatively stable, providing a steady heat source for the furnace. Fuel gas (such as coke oven gas) operates at a pressure of 4-15 kPa. The composition, pressure, and flow of organic waste gas vary with fluctuations in the process system, and the pressure can be lower, typically between 2-6 kPa. When organic waste gas is incinerated in a burner, mixing it with fuel gas before feeding it into the burner can lead to problems with mixing due to high gas pressure and low waste gas pressure. Furthermore, the introduction of waste gas into the fuel gas can affect the stability of the fuel gas, thereby impacting the furnace's production stability. Therefore, waste gas should not be directly mixed with coal gas; a burner must be capable of simultaneously burning both waste gas and fuel gas. Furthermore, due to its unstable composition and the presence of large organic molecules such as tar, its combustion performance is inferior to that of fuel gas. Incinerating it as ordinary fuel gas can result in incomplete combustion, resulting in the emission of black or yellow smoke, which also poses environmental risks. Summary of the Invention

[0004] The main purpose of the present invention is to provide a burner for high-temperature pyrolysis of high-concentration organic waste gas, aiming to solve the problem that waste gas and fuel gas cannot be directly mixed and the waste gas will not be burned fully when burned alone.

[0005] To achieve the above-mentioned purpose, the burner for high-temperature pyrolysis of high-concentration organic waste gas proposed in the present invention includes a burner body, one end of the burner body is a combustion end, and at least three ventilation channels are formed in the combustion end. The three ventilation channels include a first ventilation channel, a second ventilation channel and a third ventilation channel which are arranged in a radial direction from the inside to the outside. The first ventilation channel is used to connect the waste gas, the second ventilation channel is used to connect the combustion-supporting air, and the third ventilation channel is used to connect the fuel gas.

[0006] Optionally, a central ventilation channel is provided in the first ventilation channel, and the central ventilation channel is used to receive combustion-supporting air.

[0007] Optionally, a fourth ventilation channel is provided around the outer side of the third ventilation channel, and the fourth ventilation channel is used to receive combustion-supporting air.

[0008] Optionally, the air inlet ends of the second ventilation channel and the fourth ventilation channel are connected to each other, and are used to be connected to the same combustion-supporting air input pipeline to receive the combustion-supporting air.

[0009] Optionally, a first flame stabilizing disk is provided at the gas outlet end of the first ventilation channel, and the first flame stabilizing disk is provided with a plurality of first straight flow nozzles and a plurality of first mixed flow nozzles, and the plurality of first straight flow nozzles and the plurality of first mixed flow nozzles are alternately distributed along the circumference of the first flame stabilizing disk;

[0010] The plurality of first mixed flow nozzles are gradually inclined radially outward along the gas outlet direction.

[0011] Optionally, a swirl blade is provided at the air outlet end of the second air passage, so as to allow the combustion air in the second air passage to be blown toward the air outlet end of the first air passage so as to fully contact with the exhaust gas.

[0012] Optionally, a second flame stabilizing disk is provided at the air outlet end of the third ventilation channel, and the second flame stabilizing disk is provided with a plurality of second direct current nozzles arranged along the circumferential direction.

[0013] Optionally, the second flame stabilizing disk is further provided with a plurality of second mixed flow nozzles, and the plurality of second mixed flow nozzles and the plurality of second straight flow nozzles are alternately distributed along the circumference of the second flame stabilizing disk;

[0014] The plurality of second mixed flow nozzles are arranged to be gradually inclined radially inward along the gas outlet direction.

[0015] The present invention also proposes a heating furnace heating system, which includes a heating furnace and the burner for high-temperature pyrolysis of high-concentration organic waste gas as described above, a combustion chamber is formed inside the heating furnace, the burner for high-temperature pyrolysis of high-concentration organic waste gas is installed in the heating furnace, and the combustion end of the burner for high-temperature pyrolysis of high-concentration organic waste gas is formed in the combustion chamber.

[0016] Optionally, the heating furnace is equipped with a plurality of burners for high-temperature pyrolysis of the high-concentration organic waste gas.

[0017] In the technical solution of the present invention, the first ventilation channel, the second ventilation channel and the third ventilation channel are arranged in a circular pattern from the inside to the outside along the radial direction. Since the first ventilation channel and the third ventilation channel are independently arranged, after the burner for high-temperature pyrolysis of high-concentration organic waste gas is connected to the gas, the fuel gas and the exhaust gas are not mixed, and each flows along the two ventilation channels. The pressure difference and pressure fluctuation between the fuel gas and the exhaust gas will not affect each other. Since the second ventilation channel is arranged between the first ventilation channel and the third ventilation channel, the fuel gas and the exhaust gas flow out at the combustion end and contact with the combustion-supporting air respectively for mixed combustion. The macromolecules in the exhaust gas are preliminarily decomposed in the first combustion and are not completely burned. The unburned substances produced by the decomposition exist in the mixed flue gas after combustion. Since the combustion flame of the fuel gas surrounds and wraps around the outside of the exhaust gas combustion flame, the mixed flue gas after exhaust gas combustion enters the combustion flame of the fuel gas. Since the combustion flame of the fuel gas has a high temperature, high heat intensity, and a large high-temperature area, the unburned substances in the mixed flue gas can undergo secondary combustion and decomposition, and are completely converted into CO2 and H2O. The high-temperature pyrolysis burner for high-concentration organic waste gas ensures that the exhaust gas can be fully burned in a limited space, ensuring that the high-concentration organic waste gas can be fully decomposed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of an embodiment of a burner for high-temperature pyrolysis of high-concentration organic waste gas according to the present invention;

[0020] Figure 2 for Figure 1 A top view of the first flame stabilizing disk;

[0021] Figure 3 for Figure 2A cross-sectional view of the first flame stabilizing disk at a first direct current nozzle;

[0022] Figure 4 for Figure 2 A cross-sectional view of the first flame stabilizing disk at a first mixed flow nozzle;

[0023] Figure 5 for Figure 1 A top view of the second flame stabilizing disk;

[0024] Figure 6 for Figure 5 A cross-sectional view of a second flame stabilizing disk at a second direct current nozzle;

[0025] Figure 7 for Figure 5 A cross-sectional view of the second flame stabilizing disk at a second mixed flow nozzle;

[0026] Figure 8 This is a structural diagram of an embodiment of a heating furnace heating system of the present invention.

[0027] Description of Figure Numbers:

[0028]

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The primary function of a burner is to release the chemical energy of the fuel, providing the required heat for the furnace. The pressure and flow of fuel gas are typically relatively stable, providing a steady heat source for the furnace. Fuel gas (such as coke oven gas) operates at a pressure of 4-15 kPa. The composition, pressure, and flow of organic waste gas vary with fluctuations in the process system, and the pressure can be lower, typically between 2-6 kPa. When organic waste gas is incinerated in a burner, mixing it with fuel gas before feeding it into the burner can lead to problems with mixing due to high gas pressure and low waste gas pressure. Furthermore, the introduction of waste gas into the fuel gas can affect the stability of the fuel gas, thereby impacting the furnace's production stability. Therefore, waste gas should not be directly mixed with coal gas; a burner must be capable of simultaneously burning both waste gas and fuel gas. Furthermore, due to its unstable composition and the presence of large organic molecules such as tar, its combustion performance is inferior to that of fuel gas. Incinerating it as ordinary fuel gas can result in incomplete combustion, resulting in the emission of black or yellow smoke, which also poses environmental risks.

[0034] In view of this, the present invention proposes a burner 100 for high-temperature pyrolysis of high-concentration organic waste gas. Figure 1 This is an embodiment of a burner 100 for high-temperature pyrolysis of high-concentration organic waste gas provided by the present invention. In the present invention, the pressure difference and pressure fluctuation between the fuel gas and the waste gas will not affect each other, and the waste gas can be fully burned in a limited space, ensuring that the high-concentration organic waste gas can be fully decomposed. The burner 100 for high-temperature pyrolysis of high-concentration organic waste gas will be described below in conjunction with specific drawings.

[0035] Reference Figure 1 The burner 100 for high-temperature pyrolysis of high-concentration organic waste gas includes a burner body 1, one end of the burner body 1 is a combustion end, and at least three ventilation channels are formed in the combustion end. The three ventilation channels include a first ventilation channel 11, a second ventilation channel 12 and a third ventilation channel 13 which are arranged in a radial direction from the inside to the outside. The first ventilation channel 11 is used to connect the waste gas, the second ventilation channel 12 is used to connect the combustion-supporting air, and the third ventilation channel 13 is used to connect the fuel gas.

[0036] In the technical solution of the present invention, the first ventilation channel 11, the second ventilation channel 12 and the third ventilation channel 13 are arranged in a circular pattern from the inside to the outside along the radial direction. Since the first ventilation channel 11 and the third ventilation channel 13 are independently arranged, after the burner 100 for high-temperature pyrolysis of high-concentration organic waste gas is connected to the gas, the fuel gas and the exhaust gas are not mixed, and each flows along the two ventilation channels. The pressure difference and pressure fluctuation between the fuel gas and the exhaust gas will not affect each other. Since the second ventilation channel 12 is arranged between the first ventilation channel 11 and the third ventilation channel 13, the fuel gas and the exhaust gas flow out at the combustion end and contact with the combustion-supporting air for mixed combustion. The macromolecules in the exhaust gas are preliminarily decomposed during the first combustion and are not completely burned. The unburned substances produced by the decomposition exist in the mixed flue gas after combustion. Since the combustion flame of the fuel gas surrounds and wraps around the outside of the exhaust gas combustion flame, the mixed flue gas after exhaust gas combustion enters the combustion flame of the fuel gas. Since the combustion flame of the fuel gas has a high temperature, high heat intensity, and a large high-temperature area, the unburned substances in the mixed flue gas can undergo secondary combustion and decomposition, and be completely converted into CO2 and H2O. The high-temperature pyrolysis burner 100 for high-concentration organic waste gas ensures that the exhaust gas can be fully burned in a limited space, ensuring that the high-concentration organic waste gas can be fully decomposed.

[0037] In order to promote the combustion of exhaust gas, a central ventilation channel 15 is provided in the first ventilation channel 11. The central ventilation channel 15 is used to connect the combustion-supporting air. The combustion-supporting air forms a central wind through the central ventilation channel 15 to expand the contact area between the exhaust gas and the combustion-supporting air, improve the mixing disturbance effect of the exhaust gas and the combustion-supporting air, and contribute to sufficient combustion.

[0038] Furthermore, in order to promote the complete combustion of the fuel gas, a fourth ventilation channel 14 is provided around the outer side of the third ventilation channel 13. The fourth ventilation channel 14 is used to connect the combustion-supporting air, expand the contact area between the fuel gas and the combustion-supporting air, and provide sufficient oxygen for the combustion of the fuel gas, so that the fuel gas can be fully burned.

[0039] Since the second ventilation channel 12 and the fourth ventilation channel 14 are both used to connect to combustion-supporting air, in order to facilitate the connection of combustion-supporting air and reduce the number of equipment, in this embodiment, the air inlet ends of the second ventilation channel 12 and the fourth ventilation channel 14 are connected to each other, and are used to connect to the same combustion-supporting air input pipe to connect to combustion-supporting air. There is no need to connect multiple combustion-supporting air input pipes, thereby achieving the effect of diverting the input of combustion-supporting air, reducing the number of pipes, and simplifying the equipment.

[0040] There are many ways to realize multiple ventilation channels, and there is no specific limitation. In this embodiment, the burner body 1 includes at least five combustion tubes arranged in sequence along the radial direction. The five combustion tubes together form a central ventilation channel 15, the first ventilation channel 11, the second ventilation channel 12, the third ventilation channel 13 and the fourth ventilation channel 14, which are arranged in sequence from the inside to the outside. The air inlet ends of the two combustion tubes forming the second ventilation channel 12 and the fourth ventilation channel 14 are connected.

[0041] To increase combustion efficiency and improve combustion results, see Figure 2 In this embodiment, a first flame stabilizing disk 111 is provided at the outlet end of the first ventilation channel 11. The first flame stabilizing disk 111 is provided with a plurality of first direct current nozzles 111a and a plurality of first mixed flow nozzles 111b, which divide the exhaust gas from the first ventilation channel 11 into direct current and swirling current. The plurality of first direct current nozzles 111a cause the exhaust gas to be ejected axially, while the plurality of first mixed flow nozzles 111b are gradually inclined radially outward along the outlet direction, changing the ejection direction of part of the exhaust gas and ejecting it toward the second ventilation channel 12 to mix with the combustion-supporting air, thereby improving the mixing disturbance effect of the exhaust gas and the combustion-supporting gas and facilitating the complete combustion of the exhaust gas. The plurality of first direct current nozzles 111a and the plurality of first mixed flow nozzles 111b are alternately distributed circumferentially along the first flame stabilizing disk 111 to ensure uniform mixing of the exhaust gas and the combustion-supporting gas, as well as flame uniformity.

[0042] Similarly, in order to ensure that the exhaust gas from the first ventilation channel 11 obtains sufficient oxygen and improves combustion efficiency, a swirl blade 121 is provided at the outlet end of the second ventilation channel 12 to allow the combustion air in the second ventilation channel 12 to be blown toward the outlet end of the first ventilation channel 11 so as to fully contact the exhaust gas. The combustion air passing through the swirl blade 121 forms a strong mixture with the exhaust gas from the first ventilation channel 11, thereby promoting the combustion of the exhaust gas.

[0043] To ensure that the fuel gas and exhaust gas flow and are ejected into the flame in parallel, without affecting each other due to pressure differences and fluctuations, a second flame stabilizing disk 131 is provided at the outlet end of the third ventilation channel 13. This second flame stabilizing disk 131 is circumferentially provided with a plurality of second direct current nozzles 131a. These second direct current nozzles 131a cause the fuel gas to be ejected axially. To prevent the exhaust gas from having a low calorific value, resulting in a low temperature mixed flue gas produced by combustion and limited initial decomposition of macromolecular organic matter, which would affect the thoroughness of secondary incineration, the second flame stabilizing disk 131 is further provided with a plurality of second mixed flow nozzles 131b. These second mixed flow nozzles 131b are gradually tilted radially inward along the outlet direction to redirect the ejection direction of some fuel gas, directing some of the fuel gas into the exhaust flame. This significantly increases the temperature of the mixed flue gas, decomposes as much macromolecular organic matter as possible, and ensures a successful secondary incineration. Among them, the multiple second mixed flow nozzles 131b and the multiple second straight flow nozzles 131a are alternately distributed along the circumference of the second flame stabilizing disk 131 to ensure that the fuel gas is evenly introduced into the exhaust gas flame along the circumference, ensure the temperature uniformity of the mixed flue gas, and do not affect the uniform combustion of the fuel gas.

[0044] The present invention also provides a heating furnace heating system 1000. Figure 8 This is an embodiment of a heating furnace heating system 1000 provided by the present invention. The heating furnace heating system 1000 includes a heating furnace 200 and a burner 100 for high-concentration organic waste gas pyrolysis. The heating furnace 200 has a combustion chamber 200a formed therein. The burner 100 for high-concentration organic waste gas pyrolysis is installed in the heating furnace 200, and the combustion end of the burner 100 for high-concentration organic waste gas pyrolysis is formed in the combustion chamber 200a. The specific structure of the burner 100 for high-concentration organic waste gas pyrolysis is similar to the above embodiments. Since the heating furnace heating system 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments. No further details will be given here.

[0045] It should be noted that, in the present invention, the specific structure of the heating furnace heating system 1000 is not limited, and the heating furnace 200 can be horizontal or vertical. The burner 100 for high-concentration organic waste gas high-temperature pyrolysis can be installed horizontally in the heating furnace 200 or vertically in the heating furnace 200, without specific limitation. The number of the burners 100 for high-concentration organic waste gas high-temperature pyrolysis installed in the heating furnace 200 is also not limited. In this embodiment, the heating furnace 200 is equipped with one burner 100 for high-concentration organic waste gas high-temperature pyrolysis; in another embodiment, the heating furnace 200 is equipped with multiple burners 100 for high-concentration organic waste gas high-temperature pyrolysis. According to the working conditions, multiple burners 100 for high-concentration organic waste gas high-temperature pyrolysis can be selectively set to meet the heating needs.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A burner for high-temperature pyrolysis of high-concentration organic waste gas, characterized in that: The burner comprises a burner body, one end of which is a combustion end, and at least three ventilation channels are formed in the combustion end, wherein the three ventilation channels include a first ventilation channel, a second ventilation channel, and a third ventilation channel which are arranged in a circular manner from the inside to the outside in a radial direction, wherein the first ventilation channel is used to receive exhaust gas, the second ventilation channel is used to receive combustion-supporting air, and the third ventilation channel is used to receive fuel gas; A central ventilation channel is provided in the first ventilation channel, and the central ventilation channel is used to receive combustion air; A fourth ventilation channel is provided around the outer side of the third ventilation channel, and the fourth ventilation channel is used to receive combustion air; A second flame stabilizing disk is provided at the gas outlet end of the third ventilation channel, and a plurality of second direct current nozzles are arranged along the circumference of the second flame stabilizing disk; The second flame stabilizing disk is further provided with a plurality of second mixed flow nozzles, and the plurality of second mixed flow nozzles and the plurality of second straight flow nozzles are alternately distributed along the circumference of the second flame stabilizing disk; The plurality of second mixed flow nozzles are arranged to be gradually inclined radially inward along the gas outlet direction.

2. The burner for high-temperature pyrolysis of high-concentration organic waste gas according to claim 1, characterized in that: The air inlet ends of the second ventilation channel and the fourth ventilation channel are connected to each other and are used to be connected to the same combustion-supporting air input pipeline to receive the combustion-supporting air.

3. The burner for high-temperature pyrolysis of high-concentration organic waste gas according to claim 1, characterized in that: A first flame stabilizing disk is provided at the gas outlet end of the first ventilation channel. The first flame stabilizing disk is provided with a plurality of first straight flow nozzles and a plurality of first mixed flow nozzles. The plurality of first straight flow nozzles and the plurality of first mixed flow nozzles are alternately distributed along the circumference of the first flame stabilizing disk. The plurality of first mixed flow nozzles are gradually inclined radially outward along the gas outlet direction.

4. The burner for high-temperature pyrolysis of high-concentration organic waste gas according to claim 1, characterized in that: The outlet end of the second ventilation channel is provided with a swirl blade, which is used to blow the combustion-supporting air in the second ventilation channel toward the outlet end of the first ventilation channel so as to fully contact with the exhaust gas.

5. A heating furnace heating system, characterized in that: It comprises a heating furnace and a burner for high-temperature pyrolysis of high-concentration organic waste gas as described in any one of claims 1 to 4, a combustion chamber is formed inside the heating furnace, the burner for high-temperature pyrolysis of high-concentration organic waste gas is installed in the heating furnace, and the combustion end of the burner for high-temperature pyrolysis of high-concentration organic waste gas is formed in the combustion chamber.

6. The heating furnace heating system according to claim 5, characterized in that: The heating furnace is equipped with a plurality of burners for high-temperature pyrolysis of the high-concentration organic waste gas.

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