Multi-nozzle gasifier

Abstract

The present invention discloses a multi-nozzle gasifier, which comprises a shell and an inner container arranged inside the shell. The inner container includes an upper inner container, a middle inner container and a lower inner container which are arranged in sequence from top to bottom. The middle inner container is surrounded by a plurality of arc-shaped water-cooled components with the same structure. A flared nozzle shroud is arranged between adjacent arc-shaped water-cooled components. A side spray nozzle extending into the inner container is arranged in each nozzle shroud. The multi-nozzle gasifier further includes a nozzle angle adjustment device connected to the side spray nozzle, which is used to adjust the spraying angle of the side spray nozzle in real time according to the data in the furnace. The multi-nozzle gasifier of the present invention improves the applicability of the gasifier to coal types and the coal conversion efficiency. In addition, through the nozzle shroud and various protection measures such as protective gas, targeted protection is carried out on the inner wall area of the middle inner container with high heat load and high temperature in the gasifier, reducing the risk of burnout, prolonging the operation cycle of the gasifier and improving the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of coal gasification equipment, and particularly to a multi-nozzle gasifier. Background Art

[0002] A gasifier is the main equipment used in coal gasification technology. It reacts coal, coke, semi-coke and other fuels with a gasifying agent under high temperature and normal pressure or pressurized conditions to convert them into gas products and a small amount of residue. At present, the existing single-nozzle and multi-nozzle top-mounted gasifiers are restricted to a certain extent in terms of large-scale due to the limitation of high top temperature. For a gasifier with side-mounted nozzles, at the nozzle arrangement position, due to the large heat load and high temperature, the gasifier is prone to burning damage; the coal type at the gasification site changes from time to time. When the gasification coal type changes, it is easy to cause an unreasonable flow field distribution, resulting in low coal conversion efficiency. Therefore, the above problems all need to be solved urgently. Summary of the Invention

[0003] In view of the above problems existing in the prior art, the present invention provides a multi-nozzle gasifier, and its technical solution is as follows:

[0004] A multi-nozzle gasifier includes a housing and an inner tank disposed inside the housing. The inner tank includes an upper inner tank, a middle inner tank and a lower inner tank which are arranged in sequence from top to bottom. The middle inner tank is surrounded by a plurality of arc-shaped water-cooled components with the same structure. A flared nozzle shroud is disposed between adjacent arc-shaped water-cooled components. A side spray nozzle extending into the inner tank is disposed through each nozzle shroud. The multi-nozzle gasifier further includes a nozzle angle adjustment device connected to the side spray nozzle, which is used to adjust the spraying angle of the side spray nozzle in real time according to the data inside the furnace.

[0005] Preferably, a housing inlet is disposed at the top of the housing; an upper inner tank inlet corresponding to the housing inlet is disposed at the top of the upper inner tank; the multi-nozzle gasifier further includes a top spray nozzle extending into the inner tank through the housing inlet and the upper inner tank inlet.

[0006] Preferably, the nozzle angle adjustment device includes:

[0007] A fixture, which is connected to the side spray nozzle;

[0008] A first gear, whose end face is connected to the fixture to drive the side spray nozzle to rotate;

[0009] A second gear, which meshes with the first gear to drive the first gear to rotate; and

[0010] A motor, which is connected to the second gear to drive the second gear to rotate.

[0011] Preferably, the nozzle angle adjustment device adjusts the angle between the axis of the nozzle shroud and the axis of the side spray nozzle, so that the axis of the side spray nozzle is always tangent to the edge of a virtual circle on a plane perpendicular to the vertical axis of the middle inner cylinder, thereby forming a reasonable tangential flow field of the side spray nozzle in the inner cylinder.

[0012] Preferably, the upper inner cylinder is a tubular water wall or a coil water wall; the upper inner cylinder is composed of an upper straight section of the upper inner cylinder, an upper conical section of the upper inner cylinder, a lower straight section of the upper inner cylinder, and a lower conical section of the upper inner cylinder which are coaxially arranged from top to bottom; the lower inner cylinder is a tubular water wall or a coil water wall; the lower inner cylinder is composed of an upper conical section of the lower inner cylinder, an upper straight section of the lower inner cylinder, a lower conical section of the lower inner cylinder, and a lower straight section of the lower inner cylinder which are coaxially arranged from top to bottom.

[0013] Preferably, a metal hose is sleeved outside the pipe wall of the side spray nozzle, and both ends of the metal hose are connected to the side spray nozzle and the nozzle shroud respectively through flanges. An annular gap is formed between the metal hose and the pipe wall of the side spray nozzle, and a protective gas with a pressure 0.01 MPa - 0.3 MPa higher than the furnace pressure is introduced into the annular gap.

[0014] Preferably, the material added through the top spray nozzle is a carbon-containing substance, and the carbon-containing substance includes one or more of waste liquid, oil sludge, filter cake, coarse coal cinder, fine coal cinder, fly ash, petroleum coke, solid waste, gas waste, pulverized coal, water coal slurry, and biomass.

[0015] Preferably, a flow field regulating gas is sprayed into the flow field through the top spray nozzle, and the flow field regulating gas includes one or more of water, water vapor, oxygen, air, nitrogen, argon, and carbon dioxide.

[0016] Preferably, the top spray nozzle can be an ignition nozzle and a startup nozzle.

[0017] Preferably, a manhole, a maintenance hole, and a monitoring hole are arranged at the top of the multi-nozzle gasifier.

[0018] Compared with the prior art, in the multi-nozzle gasifier of the present invention, by setting a nozzle angle adjustment device, the spraying angle of the side spray nozzle can be adjusted in real time, improving the applicability of the gasifier to coal types, and at the same time, the coal conversion efficiency can be improved by adjusting the spraying angle of the side spray nozzle; in addition, through various protection measures such as nozzle shrouds and protective gases, the inner wall area of the middle inner cylinder with a large heat load and high temperature in the gasifier is protected specifically, reducing the risk of burnout, extending the operation cycle of the gasifier, and improving the service life; in addition, the middle inner cylinder is composed of multiple arc-shaped water-cooled components, which is convenient for replacement. Description of the Drawings

[0019] Figure 1Front structure schematic diagram of an embodiment of the present invention;

[0020] Figure 2 Top-down sectional structure schematic diagram of an embodiment of the present invention;

[0021] Figure 3 Connection structure schematic diagram of the side spray nozzle and the gasifier of an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the nozzle angle adjustment device of an embodiment of the present invention.

[0023] Explanation of reference numerals:

[0024] 1 - Outer shell 11 - Outer shell inlet 2 - Inner tank 21 - Upper inner tank 211 - Upper straight section of the upper inner tank 212 - Upper conical section of the upper inner tank 213 - Lower straight section of the upper inner tank 214 - Lower conical section of the upper inner tank 22 - Middle inner tank 221 - Arc-shaped water-cooling component 222 - Vertical axis of the middle inner tank 223 - Water inlet 224 - Water outlet 225 - Bellows 226 - Air inlet hole 23 - Lower inner tank 231 - Upper conical section of the lower inner tank 232 - Upper straight section of the lower inner tank 233 - Lower conical section of the lower inner tank 234 - Lower straight section of the lower inner tank 24 - Upper inner tank inlet 3 - Nozzle guard 31 - Cooling water inlet 32 - Cooling water outlet 33 - Protection gas inlet 4 - Top spray nozzle 5 - Side spray nozzle 61 - Axis of the side spray nozzle 62 - Axis of the nozzle guard 7 - Nozzle angle adjustment device 71 - Clamp 72 - First gear 73 - Second gear 74 - Motor 8 - Metal hose 81 - Annular gap. Detailed implementation manners

[0025] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0027] Secondly, the present invention will be described in detail in conjunction with the schematic diagrams. When detailing the embodiments of the present invention, for the convenience of description, the cross-sectional views showing the device structure will be enlarged locally not in accordance with the general scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0028] Refer to Figures 1 to 2As shown in the figure, this embodiment provides a multi-nozzle gasifier, which includes a housing 1 and an inner tank 2 arranged inside the housing 1. The inner tank 2 is coaxial with the housing 1. The inner tank 2 includes an upper inner tank 21, a middle inner tank 22, and a lower inner tank 23 arranged in sequence from top to bottom. The middle inner tank 22 is surrounded by a plurality of arc-shaped water-cooled components 221 with the same structure. A bell-mouth-shaped nozzle shroud 3 is arranged between adjacent arc-shaped water-cooled components 221. A side spray nozzle 5 extending into the inner tank 2 is arranged in each nozzle shroud 3. The multi-nozzle gasifier further includes a nozzle angle adjustment device 7 connected to the side spray nozzle 5, which is used to adjust the spraying angle of the side spray nozzle 5 in real time according to the data in the furnace.

[0029] In this embodiment, the middle inner tank 22 is surrounded by four arc-shaped water-cooled components 221 of a quarter circle. A nozzle shroud 3 is arranged between adjacent arc-shaped water-cooled components 221, and a total of four nozzle shrouds 3 are arranged. A side spray nozzle 5 extending into the inner tank 2 is arranged in each nozzle shroud 3. In other embodiments, a structure with three side spray nozzles 5 or more than four side spray nozzles 5 can also be arranged. The specific structure only differs from the structure with four side spray nozzles 5 in the arc shape and quantity of the arc-shaped water-cooled components 221, as well as the quantity of the nozzle shrouds 3 and the side spray nozzles 5. Therefore, it will not be elaborated here one by one. Specifically, the arc-shaped water-cooled component 221 is one of a serpentine water-cooled wall, a tubular water-cooled wall, and a water-cooled jacket.

[0030] In this embodiment, the middle inner tank 22 is arranged to be surrounded by a plurality of arc-shaped water-cooled components 221, which is convenient for the removal and installation of the middle inner tank 22. For example, when a certain arc-shaped water-cooled component 221 is damaged, the arc-shaped water-cooled component 221 can be directly removed from the furnace body without removing the upper inner tank 21, which is convenient for replacement and maintenance. In addition, since the inner wall of the middle inner tank 22 has a large heat load and high temperature and is prone to burning, the nozzle shroud 3 adopts a nozzle shroud 3 with a strengthened heat transfer design, thereby protecting the side spray nozzle 5 and the middle inner tank 22 and extending the service life of the gasifier.

[0031] Specifically, an inlet 11 of the housing is arranged at the top of the housing 1; an inlet 24 of the upper inner tank corresponding to the inlet 11 of the housing is arranged at the top of the upper inner tank 21; the multi-nozzle gasifier further includes a top spray nozzle 4 extending into the inner tank 2 through the inlet 11 of the housing and the inlet 24 of the upper inner tank, and the top spray nozzle 4 sprays into the inner tank from the top of the gasifier.

[0032] Furthermore, the upper inner tank 21 is a tubular water-cooled wall or a coiled tube water-cooled wall; the upper inner tank 21 includes an upper straight section 211, an upper tapered section 212, a lower straight section 213, and a lower tapered section 214 of the upper inner tank arranged coaxially from top to bottom in sequence; the lower inner tank 23 is a tubular water-cooled wall or a coiled tube water-cooled wall; the lower inner tank 23 is composed of an upper tapered section 231, an upper straight section 232, a lower tapered section 233, and a lower straight section 234 of the lower inner tank arranged coaxially from top to bottom in sequence.

[0033] With such a structure, the upper inner liner 21, the middle inner liner 22 and the lower inner liner 23 jointly define a gasification chamber for performing coal gasification operation on the materials entering the gasification chamber.

[0034] Further, referring to Figure 4 , the nozzle angle adjustment device 7 includes a fixture 71, a first gear 72, a second gear 73 and a motor 74. Among them, the fixture 71 is connected to the side spray nozzle 5, specifically by clamping. The end face of the first gear 72 is connected to the fixture 71 to drive the side spray nozzle 5 to rotate. The second gear 73 meshes with the first gear 72 to drive the first gear 72 to rotate; the motor 74 is connected to the second gear 73 to drive the second gear 73 to rotate. Specifically, referring to Figure 4 , in this embodiment, the fixture 71 is fixed to one side end face of the first gear 72. The first gear 72 is a large-sized gear with a large number of teeth, and the second gear 73 is a small-sized gear with a small number of teeth. Specifically, the second gear 73 is sleeved on the output shaft of the motor 74. With such a structure, the motor 74 can be used to drive the second gear 73 to rotate, thereby driving the fixture 71 fixed on the first gear 72 and driving the side spray nozzle 5 to rotate, so as to adjust the spraying angle of the side spray nozzle 5. Specifically, when different coal types are used in the gasifier, different spraying angles are required. Therefore, by adjusting the spraying angle of the side spray nozzle 5, a suitable flow field can be formed, thereby improving the gasification efficiency and realizing long-term operation; for example, for coal types with low ash content and poor reactivity, the spraying angle can be adjusted to a larger value, preferably 4.5° to 20°, to form a strong swirling flow field, realize ash slag wall hanging to protect the inner liner 2 and increase the residence time of the materials, and improve the carbon conversion efficiency; for the same gasifier, if the coal type needs to be changed to a coal type with high ash content and good reactivity during the operation of the gasifier, the spraying angle can be adjusted to a small value, preferably 0-10°, so that the materials tend to concentrate in the center of the gasification chamber, the temperature near the wall of the inner liner 2 is relatively low, and the impact wear of the ash slag on the inner liner 2 of the gasification chamber is reduced, and the service life is improved.

[0035] Specifically, when the nozzle angle adjustment device 7 adjusts the spraying angle of the side spray nozzle 5, the minimum adjustment angle is 0.5°. At the same time, sensors for monitoring various data in the gasifier are arranged in the gasifier. The specific real-time monitored data includes coal quantity (t / h), oxygen quantity (Nm 3 / h), steam quantity (t / h), effective gas production (Nm 3 / h), CO%, H2%, CO2%, CH4 ppm, etc. In addition, samples of the coal fed into the furnace are taken and their components are measured offline. The specific measured data include the moisture content of the coal fed into the furnace Mwt%, the ash content of the coal fed into the furnace Awt%, the carbon content of the coal fed into the furnace Cwt%, the hydrogen content of the coal fed into the furnace Hwt%, the oxygen content of the coal fed into the furnace Owt%, the sulfur content of the coal fed into the furnace Swt%, the nitrogen content of the coal fed into the furnace Nwt%, etc. Specifically, when adjusting the injection angle of the side injection nozzle 5 through the nozzle angle adjustment device 7, first inject at a certain angle. After the furnace environment stabilizes, measure and calculate the carbon conversion rate and the effective gas content (CO% + H2%). Taking the carbon conversion rate greater than 98% and the effective gas content greater than 90% as the adjustment target, further adjust the injection angle of the side injection nozzle 5, and re-measure the furnace data after the adjustment angle. Finally, achieve the required adjustment target. See Table 1 for details.

[0036] Table 1: Gasification Parameter Table

[0037] Parameter Calculation / Monitoring Only top spray Only side spray Top spray + side spray Coal A 3° Coal B 3° Coal B 5° Moisture content of coal charged into furnace Mwt% Offline measurement 2 2 2 2 2 2 Ash content of coal charged into furnace Awt% Offline measurement 14 14 14 14 10 10 Carbon content of coal charged into furnace Cwt% Offline measurement 69 69 69 69 75 75 Hydrogen content of coal charged into furnace Hwt% Offline measurement 3.6 3.6 3.6 3.6 3.5 3.5 Oxygen content of coal charged into furnace Owt% Offline measurement 9.3 9.3 9.3 9.3 8.5 8.5 Sulfur content of coal charged into furnace Swt% Offline measurement 0.5 0.5 0.5 0.5 1 1 Nitrogen content of coal charged into furnace Nwt% Offline measurement 1.6 1.6 1.6 1.6 1 1 Coal quantity t / h Real-time measurement 89 89 89 89 84 84 Oxygen quantity Nm3 / h Real-time measurement 47500 47500 47500 47500 49300 49300 Steam quantity t / h Real-time measurement 6.5 6.5 6.5 6.5 6.2 6.2 Effective gas production Nm3 / h Real-time measurement 153600 151500 156000 156000 150500 157000 CO% Real-time measurement 65.1 64.5 66.1 66.1 64.8 69 H2％ Real-time measurement 26.1 26.3 25.9 25.9 24 24.1 CO2% Real-time measurement 8.0 8.7 7.4 7.4 8.2 6.3 CH4 ppm Real-time measurement 350 400 300 300 400 300 Residual carbon in filter cake% Offline measurement 13.6 18 6.5 6.5 30 9.5 Residual carbon in coarse slag% Offline measurement 3 5 0.7 0.7 6 1 Carbon conversion rate% Calculated 97.7 96.9 99.1 99.1 96.2 99

[0038] Referring to Table 1, when gasifying coal by only top injection, the carbon conversion rate can reach 97.7%, and the effective gas content (CO% + H2%) can reach 91.2%; when gasifying coal by only side injection, the carbon conversion rate can reach 96.6%, and the effective gas content (CO% + H2%) can reach 90.8%; when gasifying coal by top injection plus side injection, the carbon conversion rate can reach 99.1%, and the effective gas content (CO% + H2%) can reach 92%. Due to reasons such as the supply of raw coal and fluctuations in coal prices at the gasification site, it is often necessary to change the coal type. However, in order not to affect production and reduce equipment replacement costs, generally, the method of shutting down the furnace to replace the gasification equipment to adapt to the gasification performance of the new coal type is not adopted. This requires the gasification equipment to have the adjustment ability to adapt to coal type changes. The nozzle angle adjustment device can well solve this problem. For example, when gasifying coal A with a side injection nozzle 5 injection angle of 3°, the carbon conversion rate is 99.1%, and the effective gas content is 92%; due to changes in the supply of raw coal at the site, it is necessary to change to coal type B. When gasifying coal B with the same 3° injection angle, the effective gas content drops to 88.8%, and the carbon conversion rate drops to 96.2%; after multiple adjustments, finally, with a side injection nozzle 5 injection angle of 5°, the carbon conversion rate rises to 99%, and the effective gas content rises to 93.1%. When using coal B, the injection angle is adjusted from 3° to 5°, and other conditions remain unchanged. The effective gas production increases from 150500 to 157000 Nm 3 / h, producing 6500 Nm more effective gas per hour 3 , calculated at 1.2 yuan / Nm3 of effective gas, the monthly income increase is 5.616 million yuan.

[0039] Specifically, referring to Figure 2 , the nozzle angle adjustment device 7 adjusts the angle between the nozzle shroud axis 62 of the nozzle shroud 3 and the side spray nozzle axis 61 of the side spray nozzle 5, so that the side spray nozzle axis 61 of the side spray nozzle 5 is always tangent to the edge of a virtual circle on a plane perpendicular to the vertical axis 222 of the middle inner tank, Figure 2 The virtual circle is shown in. Thus, a reasonable tangential flow field is formed by the side spray nozzle 5 in the inner tank 2. Specifically, in this embodiment, the size of the virtual circle is as Figure 2 shown. The position of the virtual circle is at the geometric center of the middle inner tank 22 and is located in a plane perpendicular to the vertical axis 222 of the middle inner tank. In other embodiments, the position of the virtual circle may not be at the geometric center of the middle inner tank 22, for example, slightly above or slightly below.

[0040] Further, referring to Figure 3 , it is a schematic diagram of the connection structure between the side spray nozzle and the gasifier according to an embodiment of the present invention. Specifically, the side spray nozzle 5, the metal hose 8, and the nozzle shroud 3 are connected by flanges; see Figure 3 on the right side in. A metal hose 8 is sleeved outside the pipe wall of the side spray nozzle 5. Both ends of the metal hose 8 are connected to the side spray nozzle 5 and the nozzle shroud 3 respectively by flanges. An annular gap 81 is formed between the metal hose 8 and the pipe wall of the side spray nozzle 5. A protective gas with a pressure 0.01 MPa - 0.3 MPa higher than the furnace pressure is introduced into the annular gap 81. Specifically, the protective gas is introduced into the annular gap 81 through a protective gas inlet 33 provided on the flange; through such a setting, the side spray nozzle 5 can be protected from damage during the gasification operation, and the service life of the side spray nozzle 5 can be improved; at the same time, since the metal hose 8 is flexible, it is more convenient for the nozzle angle adjustment device 7 to adjust the angle of the side spray nozzle 5. Continuing to refer to Figure 3 , the flared end of the nozzle shroud 3 extends into the inner tank of the gasifier. The other end of the nozzle shroud 3 is located outside the gasifier and is provided with a cooling water inlet 31 and a cooling water outlet 32, thereby forming a water cooling cycle for the nozzle shroud 3 to prevent the nozzle shroud 3 from being burned out at high temperature. Continuing to refer to Figure 3 , the water inlet 223 and the water outlet 224 of the water-cooled component of the middle inner tank in this embodiment are both connected by flanges and installed on the installation holes provided on the outer shell 1, so as to supply water to the middle inner tank 22 from outside the gasifier. Continuing to refer to Figure 3 , in order to prevent high-temperature gas from flowing into the space between the middle inner tank 22 and the furnace shell 1, the upper end of the middle inner tank 22 and the lower cone section 214 of the upper inner tank are hermetically connected by welding I, and the lower end of the middle inner tank 22 and the upper cone section 231 of the lower inner tank are hermetically connected by welding II. Since the middle inner tank 22 will expand to a certain extent when heated, a bellows 225 is provided on the pipe wall of the middle inner tank 22 to absorb the pressure generated by the thermal expansion of the middle inner tank 22. Continuing to refer to Figure 3, the inner liner 22 and the nozzle guard 3 are not in direct contact. There is also a certain annular gap between them, and a protective gas with a certain pressure can be introduced into this annular gap to prevent the gas flow from entering during coal gasification treatment. Specifically, the protective gas is introduced through the air inlet holes provided on the flange in contact with this annular gap. In this embodiment, the air inlet holes are air inlet holes 226.

[0041] Furthermore, the material added through the top injection nozzle 4 is a carbon-containing substance, which may selectively include a gasifying agent; the carbon-containing substance may be one or more of the following materials, specifically including waste liquid, oily sludge, filter cake, coarse coal cinder, fine coal cinder, fly ash, petroleum coke, solid waste, gas waste, pulverized coal, water coal slurry, biomass, etc. Among them, injecting waste through the top injection nozzle 4 can, on the one hand, economically and environmentally treat the waste, and on the other hand, change the flow field to prevent overheating at the top of the gasifier.

[0042] Furthermore, a flow field regulating gas is injected through the top injection nozzle 4, and the flow field regulating gas may be one or more of the following substances, specifically including water, steam, oxygen, air, nitrogen, argon, carbon dioxide, synthesis gas, etc.

[0043] With such a structure, by combining the top injection nozzle 4 and the side injection nozzle 5, the types and proportions of the materials of the top injection nozzle 4 are used to further regulate the flow field, form a reasonable temperature field, strengthen the mixing of materials, and improve the coal conversion efficiency and the adaptability of coal types in the gasifier.

[0044] Furthermore, the top injection nozzle 4 may be an ignition nozzle and a start-up nozzle.

[0045] Furthermore, manholes, maintenance holes, and monitoring holes are arranged at the top of the multi-nozzle gasifier.

[0046] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A multi-nozzle gasifier, characterized in that, It includes a shell and an inner tank arranged inside the shell. The inner tank includes an upper inner tank, a middle inner tank, and a lower inner tank arranged in sequence from top to bottom. The middle inner tank is surrounded by a plurality of arc-shaped water-cooling components with the same structure. A flared nozzle shroud is arranged between adjacent arc-shaped water-cooling components. A side spray nozzle extending into the inner tank is inserted through each nozzle shroud. The multi-nozzle gasifier further includes a nozzle angle adjustment device connected to the side spray nozzle, which is used to adjust the spraying angle of the side spray nozzle in real time according to the data in the furnace.

2. The multi-nozzle gasifier according to claim 1, wherein, An inlet of the shell is arranged at the top of the shell; an inlet of the upper inner tank corresponding to the inlet of the shell is arranged at the top of the upper inner tank; the multi-nozzle gasifier further includes a top spray nozzle extending into the inner tank through the inlet of the shell and the inlet of the upper inner tank.

3. The multi-nozzle gasifier according to claim 1, characterized in that, The nozzle angle adjustment device includes: A fixture, which is connected to the side spray nozzle; A first gear, the end face of which is connected to the fixture to drive the side spray nozzle to rotate; A second gear, which meshes with the first gear to drive the first gear to rotate; and A motor, which is connected to the second gear to drive the second gear to rotate.

4. The multi-nozzle gasifier according to claim 1, wherein The nozzle angle adjustment device adjusts the included angle between the axis of the nozzle shroud and the axis of the side spray nozzle, so that the axis of the side spray nozzle is always tangent to the edge of a virtual circle on a plane perpendicular to the vertical axis of the middle inner tank, thereby forming a reasonable tangential flow field of the side spray nozzle in the inner tank.

5. The multi-nozzle gasifier according to claim 1, characterized in that The upper inner tank is a tubular water-cooled wall or a coil water-cooled wall; the upper inner tank is composed of an upper straight section of the upper inner tank, an upper conical section of the upper inner tank, a lower straight section of the upper inner tank, and a lower conical section of the upper inner tank arranged coaxially from top to bottom in sequence; the lower inner tank is a tubular water-cooled wall or a coil water-cooled wall; the lower inner tank is composed of an upper conical section of the lower inner tank, an upper straight section of the lower inner tank, a lower conical section of the lower inner tank, and a lower straight section of the lower inner tank arranged coaxially from top to bottom in sequence.

6. The multi-nozzle gasifier according to claim 1, characterized in that A metal hose is sleeved outside the pipe wall of the side spray nozzle. The two ends of the metal hose are respectively connected to the side spray nozzle and the nozzle shroud through flanges. An annular gap is formed between the metal hose and the pipe wall of the side spray nozzle. A protective gas with a pressure 0.01 MPa - 0.3 MPa higher than the pressure in the furnace is introduced into the annular gap.

7. The multi-nozzle gasifier according to claim 2, wherein, The material added through the top spray nozzle is a carbon-containing substance, and the carbon-containing substance includes one or more of waste liquid, petroleum coke, solid waste, gas waste, pulverized coal, water coal slurry, biomass; the solid waste at least includes oil sludge, coarse coal cinder, fine coal cinder or fly ash.

8. The multi-nozzle gasifier according to claim 2, wherein: A flow field regulating gas is sprayed into the flow field through the top spray nozzle, and the flow field regulating gas includes one or more of water, steam, oxygen, air, nitrogen, argon, carbon dioxide.

9. The multi-nozzle gasifier according to claim 2, wherein: The top spray nozzle includes an ignition nozzle and a startup nozzle.

10. The multi-nozzle gasifier according to claim 1, characterized in that: A manhole, a maintenance hole and a monitoring hole are arranged at the top of the multi-nozzle gasifier.

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