Feed pipe, nozzle and gasification furnace

Abstract

The present application relates to gasification furnace technical field, provide a kind of feed pipe, nozzle and gasification furnace, the feed pipe includes main pipe (1) and sleeve pipe (2), the main pipe (1) has spirally extended first channel, for transporting first fuel, the sleeve pipe (2) is sleeved in the outer of the main pipe (1), and the inner side wall of at least part of the sleeve pipe (2) is spaced apart from the corresponding outer side wall of the main pipe (1) to be formed into spirally extended second channel, for transporting second fuel, so that the feed pipe can provide the rotational flow mixture formed by the first fuel and the second fuel.The present application solves the problem of poor reaction efficiency caused by the three nozzles of the corlins furnace in the prior art.

Description

Technical Field

[0001] This invention relates to the field of gasification furnace technology, and more specifically to a feed pipe, a nozzle, and a gasification furnace. Background Technology

[0002] The gasification technology of fluidized bed coal gasification is carried out under high temperature and high pressure, and the dynamic control is basically transformed into mass transfer control. Therefore, when designing a coal gasification unit, how to improve the mass transfer mixing efficiency is one of the key factors. The gasifier in the multi-nozzle mode will significantly improve the micro-mixing efficiency due to the increase in mass transfer area and the shortening of mass transfer distance, thereby improving the gasification efficiency.

[0003] For example, the Colin gasifier is a top-mounted three-nozzle gasifier. Its advantages include a wide range of coal adaptability, and the three-nozzle design provides greater load adjustment flexibility compared to a single-nozzle design, making it more suitable for large-scale gasifier development. However, the three nozzles of the Colin gasifier are relatively close together, and each burner unit is a vertically downward coaxial jet, resulting in a longer flame jet, which does not contribute to improving mass transfer and reaction efficiency. Summary of the Invention

[0004] In view of this, the present invention provides a feed pipe, nozzle and gasifier to solve the problem of poor reaction efficiency caused by the three nozzles adopting a coaxial jet form in the prior art Colin furnace.

[0005] To achieve the above objectives, the present invention provides a feeding pipe;

[0006] The feed pipe includes a main pipe and a sleeve. The main pipe has a spirally extending first channel for conveying a first fuel. The sleeve is fitted over the main pipe, and at least a portion of the inner sidewall of the sleeve is spaced apart from the corresponding outer sidewall of the main pipe to jointly form a spirally extending second channel for conveying a second fuel, thereby enabling the feed pipe to provide a swirling mixture of the first fuel and the second fuel.

[0007] Through the above technical solution, the feed pipe is provided with a main pipe and a sleeve. The main pipe uses a spiral first channel to transport the first fuel, so that the main pipe can spray the first fuel in a swirling form. The feed pipe uses a spiral second channel to transport the second fuel, so that the second fuel can be sprayed in a swirling form through the second channel formed by the sleeve and the main pipe. In this way, the feed pipe can provide a swirling mixture of the first fuel and the second fuel, which is conducive to a more uniform mixing of the first fuel and the second fuel. Taking the feed pipe used on the nozzle of the gasifier as an example, the feed pipe with the above structure can also increase the mass transfer area of ​​the first fuel and the second fuel, shorten the mass transfer distance of the first fuel and the second fuel, significantly improve the micro-mixing efficiency of the first fuel and the second fuel, and thus improve the gasification efficiency.

[0008] Preferably, the entire inner wall of the sleeve is spaced apart from the outer wall of the main tube, and the cross-section of the second channel is annular.

[0009] Preferably, a swirling section is provided in the second channel, the swirling section is configured to extend in a spiral direction along the second channel, and the swirling section is provided on the inner side wall of the sleeve and / or the outer side wall of the main tube.

[0010] Preferably, the second channel includes a plurality of swirling sections spaced apart.

[0011] Preferably, the inlet side of the sleeve can be sealed to the outside of the main pipe by a clamping assembly, and the clamping assembly has a feed port for the second fuel to flow into the second channel.

[0012] A second aspect of the present invention provides a nozzle;

[0013] The nozzle includes an igniter and a feed tube as described above, the feed tube extending spirally around the outer periphery of the igniter and capable of supplying the swirling mixture to the igniter, the igniter being configured to perform an ignition operation to ignite the swirling mixture.

[0014] Preferably, the nozzle comprises a plurality of feed tubes spaced apart.

[0015] Preferably, the nozzle includes a distributor comprising an upward-opening feed trough for receiving the first fuel, the distributor including a plurality of feed channels arranged to extend downwardly from the bottom wall of the feed trough, and the bottom openings of the plurality of feed channels respectively communicating with the inlets of the plurality of main pipes; and / or

[0016] The nozzle includes a distributor, which includes a ring pipe and a plurality of branch pipes. The ring pipe includes an inlet for the second fuel to flow in and an outlet for the second fuel to discharge. The inlets of the plurality of branch pipes are respectively connected to the outlets of the plurality of ring pipes, and the outlets of the plurality of branch pipes are respectively connected to the inlet of the sleeve.

[0017] Preferably, the nozzle includes a cooler configured to cool the feed pipe.

[0018] Preferably, the cooler is a heat exchange type structure.

[0019] A third aspect of the present invention provides a gasifier;

[0020] The gasifier includes any of the nozzles described above. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the application structure of an embodiment of the feed tube provided by the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of an embodiment of the feed pipe;

[0023] Figure 3 yes Figure 1 A schematic diagram of the connection structure of an embodiment of the feed pipe;

[0024] Figure 4 yes Figure 1 A schematic diagram of the side cross-sectional structure;

[0025] Figure 5 yes Figure 1 A schematic diagram of the transverse cross-sectional structure.

[0026] Explanation of reference numerals in the attached figures

[0027] 1. Main pipe; 2. Sleeve; 3. Swirl section; 4. Clamping assembly; 5. Igniter; 6. Outer shell; 7. Oxidizer pipe; 8. Combustion pipe; 9. Fuel distributor; 10. Ring pipe; 11. Branch pipe; 12. Distributor; 13. Feed trough; 14. Distributor channel; 15. Cooler; 16. Inlet; 17. Outlet. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] like Figures 1 to 5 As shown, the present invention provides a feed pipe comprising a main pipe 1 and a sleeve 2. The main pipe 1 has a spirally extending first channel for conveying a first fuel. The sleeve 2 is sleeved outside the main pipe 1, and at least a portion of the inner sidewall of the sleeve 2 is spaced apart from the corresponding outer sidewall of the main pipe 1 to jointly form a spirally extending second channel for conveying a second fuel, thereby enabling the feed pipe to provide a swirling mixture of the first fuel and the second fuel.

[0030] Through the above technical solution, the feed pipe is provided with a main pipe and a sleeve. The main pipe uses a spiral first channel to transport the first fuel, so that the main pipe can spray the first fuel in a swirling form. The feed pipe uses a spiral second channel to transport the second fuel, so that the second fuel can be sprayed in a swirling form through the second channel formed by the sleeve and the main pipe. In this way, the feed pipe can provide a swirling mixture of the first fuel and the second fuel, which is conducive to a more uniform mixing of the first fuel and the second fuel. Taking the feed pipe used on the nozzle of the gasifier as an example, the feed pipe with the above structure can also increase the mass transfer area of ​​the first fuel and the second fuel, shorten the mass transfer distance of the first fuel and the second fuel, significantly improve the micro-mixing efficiency of the first fuel and the second fuel, and thus improve the gasification efficiency.

[0031] In an optional embodiment of the present invention, the igniter 5 is centrally located at the center of the feed pipe to facilitate the ignition of the mixture of the first and second fuels. The main pipe 1 and the sleeve 2 can be connected to the combustion pipe 8 through which the first or second fuel is introduced, respectively. When oxygen surrounds pulverized coal for production, the main pipe 1 is connected to the combustion pipe 8 through which pulverized coal is introduced, and the sleeve 2 is connected to the combustion pipe 8 through which oxygen is introduced. When pulverized coal surrounds oxygen for production, the main pipe 1 is connected to the combustion pipe 8 through which oxygen is introduced, and the sleeve 2 is connected to the combustion pipe 8 through which pulverized coal is introduced. To facilitate the mixing and ignition of the first and second fuels, in a preferred embodiment of the present invention, an oxidant pipe 7 for filling with oxidant for preheating can be provided at the fuel mixing chamber of the first and second fuels. Preferably, the oxidant pipe 7 and the combustion pipe 8 are concentrated at the center of the space formed by the main pipe 1 and the sleeve 2.

[0032] In an optional embodiment of the present invention, the entire inner wall of the sleeve 2 is spaced apart from the outer wall of the main pipe 1, and the cross-section of the second channel is an annular structure to facilitate the delivery of the second fuel and ensure that it is finally ejected in a rotating form, thereby enabling the feed pipe to better provide the swirling mixture formed by the first fuel and the second fuel.

[0033] In an optional embodiment of the invention, a swirling section 3 is provided within the second channel. This swirling section 3 extends along the spiral direction of the second channel and is located on the inner wall of the sleeve 2 and / or the outer wall of the main pipe 1. The swirling section 3 can be a protrusion / groove extending radially from the main pipe 1 to the sleeve 2. In a further optional embodiment of the invention, the second channel includes a plurality of swirling sections 3. The plurality of swirling sections 3 work together on the second fuel in the second channel, creating a velocity difference between the second fuel and the first fuel, thereby facilitating a more uniform and rapid formation of a swirling mixture when the first and second fuels come into contact.

[0034] Specifically, the swirling section 3 can be a groove extending along the inner wall of the sleeve 2 and / or the outer wall of the main pipe 1. The groove forms an oriented cavity that can guide the first fuel, thereby causing the first fuel to swirl. At the same time, a velocity difference is generated between the first fuel and the second fuel in the radial direction of their conveying pipes (main pipe and sleeve), thereby increasing the mass transfer area of ​​the first fuel and the second fuel, and thus increasing the mixing efficiency of the first fuel and the second fuel.

[0035] In an optional embodiment of the present invention, the inlet side of the sleeve 2 can be sealed to the outside of the main pipe 1 via the clamp kit 4, and the clamp kit 4 has a feed port for the second fuel to flow into the second channel. The clamp kit 4 improves the stability of the overall structure of the feed pipe, facilitates the control of fuel supply to the main pipe 1 and the sleeve 2 respectively, and allows for adaptive adjustment of the feed pipe to meet different supply requirements of the first and second fuels during application. In a further optional embodiment of the present invention, the clamp kit 4 is provided with a pipe connecting to the combustion pipe 8, and / or, the clamp kit 4 is provided with a slot or through-hole structure for fixing the position of the combustion pipe 8. This makes the overall structure more compact, thereby reducing the volume occupied by the application while effectively avoiding exposed wiring.

[0036] This invention provides a nozzle;

[0037] The nozzle includes an igniter and a feed tube as described above. The feed tube extends spirally around the outer periphery of the igniter and is capable of providing a swirling mixture to the igniter. The igniter is configured to perform an ignition operation to ignite the swirling mixture. In an optional embodiment of the invention, the nozzle includes a plurality of feed tubes spaced apart. The igniter may be a high-temperature electric kettle ignition device. In a further optional embodiment of the invention, a fuel distributor 9 is included for connecting a combustion pipe 8 that supplies a first fuel or a second fuel to different feed tubes. The fuel distributor 9 connects the first fuel or the second fuel to the fuel pipe 8 that is connected to the main pipe 1 or the sleeve 2, ensuring that the fuel received by the multiple feed tubes is the same, facilitating control of production operations.

[0038] In an optional embodiment of the invention, the nozzle includes a distributor 12, which includes an upward-opening feed trough 13 for receiving the first fuel. The distributor 12 includes a plurality of distribution channels 14, which are arranged to extend downwardly from the bottom wall of the feed trough 13, and the bottom openings of the plurality of distribution channels 14 are respectively connected to the inlets of a plurality of main pipes 1. In other embodiments of the invention, the nozzle includes a distributor 12, which includes a ring pipe 10 and a plurality of branch pipes 11. The ring pipe 10 includes an inlet for the inflow of the second fuel and an outlet for the discharge of the second fuel, and the inlets of the plurality of branch pipes 11 are respectively connected to the outlets of the plurality of ring pipes 10, and the outlets of the plurality of branch pipes 11 are respectively connected to the inlets of the sleeve 2. When the above structure is applied in a gasifier structure, the first fuel can be pulverized coal, and the second fuel can be oxygen.

[0039] The aforementioned structure allows for a multi-unit burner arrangement at the top of the gasifier. Each burner is coaxial and swirling, improving the mixing speed and reaction efficiency between materials. This ensures that pulverized coal and oxygen can burn completely and complete the gasification reaction in a shorter residence time, effectively reducing the gasifier's design size and solving the problem of large size and high cost in current industrial gasifiers. Simultaneously, the flat-flame burner uses a distributor to divide a single coal line into several coal channels entering the gasifier, ensuring uniform pulverized coal flow in each channel. This reduces the number of coal lines, simplifies the control system of the entire pulverized coal conveying system, and further lowers investment costs.

[0040] In an optional embodiment of the present invention, the nozzle includes a cooler 15, which is configured to cool the feed pipe. This avoids the situation where the nozzle center temperature is high due to the low nozzle spacing and overly concentrated nozzles, thus reducing the nozzle's service life. In a further optional embodiment of the present invention, the cooler 15 is a heat exchanger structure.

[0041] In a further optional embodiment of the invention, the cooler 15 includes a housing 6 and an inlet 16 and an outlet 17 disposed on radially opposite sides of the housing 6. Liquid (which may be water or other liquids used for cooling) enters through the inlet 16 and flows out through the outlet 17 to absorb the temperature of the housing 6 and its inner and outer peripheries, thereby cooling the entire nozzle as the liquid flows out.

[0042] The present invention also provides a gasifier comprising the nozzle described in any of the above descriptions.

[0043] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A nozzle, characterized in that, The nozzle includes an igniter and a feed tube, the feed tube extending spirally around the outer periphery of the igniter and capable of supplying swirling mixture to the igniter, the igniter being configured to perform an ignition operation to ignite the swirling mixture. The feed pipe includes a main pipe (1) and a sleeve (2). The main pipe (1) has a spirally extending first channel for conveying a first fuel. The sleeve (2) is sleeved outside the main pipe (1), and at least a portion of the inner wall of the sleeve (2) is spaced apart from the corresponding outer wall of the main pipe (1) to jointly form a spirally extending second channel for conveying a second fuel, thereby enabling the feed pipe to provide a swirling mixture of the first fuel and the second fuel.

2. The nozzle according to claim 1, characterized in that, The entire inner wall of the sleeve (2) is spaced apart from the outer wall of the main tube (1), and the cross-section of the second channel is an annular structure.

3. The nozzle according to claim 2, characterized in that, The second channel is provided with a swirling section (3), which is configured to extend along the spiral direction of the second channel, and the swirling section (3) is provided on the inner side wall of the sleeve (2) and / or the outer side wall of the main tube (1).

4. The nozzle according to claim 3, characterized in that, The second channel includes a plurality of swirling sections (3) spaced apart.

5. The nozzle according to any one of claims 1-4, characterized in that, The inlet side of the sleeve (2) can be sealed to the outside of the main pipe (1) by means of a clamp (4), and the clamp (4) has a feed port for the second fuel to flow into the second channel.

6. The nozzle according to claim 1, characterized in that, The nozzle includes a plurality of feed tubes spaced apart.

7. The nozzle according to claim 6, characterized in that, The nozzle includes a distributor (12) comprising an upward-opening feed trough (13) for receiving the first fuel, the distributor (12) comprising a plurality of feed channels (14) configured to extend downwardly from the bottom wall of the feed trough (13), and the bottom openings of the plurality of feed channels (14) respectively communicating with the inlets of the plurality of main pipes (1); and / or The nozzle includes a distributor (12), which includes a ring pipe (10) and a plurality of branch pipes (11). The ring pipe (10) includes an inlet for the second fuel to flow in and an outlet for the second fuel to discharge. The inlets of the plurality of branch pipes (11) are respectively connected to the outlets of the plurality of ring pipes (10), and the outlets of the plurality of branch pipes (11) are respectively connected to the inlet of the sleeve (2).

8. The nozzle according to claim 1, characterized in that, The nozzle includes a cooler (15) configured to cool the feed pipe.

9. The nozzle according to claim 8, characterized in that, The cooler (15) is a heat exchanger.

10. A gasifier, characterized in that, The gasifier includes the nozzle as described in any one of claims 1-9.

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