CN115725339A

CN115725339A - Feed pipe, nozzle and gasification furnace

Info

Publication number: CN115725339A
Application number: CN202111002611.6A
Authority: CN
Inventors: 冯子洋; 李烨; 刘臻; 方薪晖; 安海泉; 彭宝仔; 孙凯蒂
Original assignee: China Energy Investment Corp Ltd; National Institute of Clean and Low Carbon Energy
Current assignee: China Energy Investment Corp Ltd; National Institute of Clean and Low Carbon Energy
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2023-03-03

Abstract

The invention relates to the technical field of gasification furnaces, and provides a feed pipe, a nozzle and a gasification furnace, wherein the feed pipe comprises a main pipe (1) and a sleeve (2), the main pipe (1) is provided with a first channel extending spirally for conveying a first fuel, the sleeve (2) is sleeved outside the main pipe (1), at least part of inner side wall of the sleeve (2) and the corresponding outer side wall of the main pipe (1) are arranged at intervals to form a second channel extending spirally together for conveying a second fuel, so that the feed pipe can provide a rotational flow mixing material formed by the first fuel and the second fuel. The invention is described. The invention solves the problem of poor reaction efficiency of the Coriolis furnace in the prior art due to the fact that three nozzles are in a coaxial jet flow mode.

Description

Feed pipe, nozzle and gasification furnace

Technical Field

The invention relates to the technical field of gasification furnaces, in particular to a feeding pipe, a nozzle and a gasification furnace.

Background

The coal gasification technology of the entrained flow bed is carried out at high temperature and high pressure, and the kinetic control is basically converted into mass transfer control, so that when a coal gasification device is designed, how to improve the mass transfer mixing efficiency is one of key factors, and the micro mixing efficiency of the gasification furnace in a multi-nozzle mode can be obviously improved due to the increase of the mass transfer area and the reduction of the mass transfer distance, so that the gasification efficiency is improved.

For example, the gasifier Lin Lu is an overhead three-nozzle gasifier, and is characterized in that the gasifier has wide coal type adaptability, and the three-nozzle scheme has a larger load adjustment margin than the single-nozzle scheme, thereby being more beneficial to the large-scale development of the gasifier. However, the three nozzles of the Coriolis furnace are close in distance, each burner unit is in a vertical downward coaxial jet form, flame jet is long, and mass transfer and reaction efficiency cannot be improved.

Disclosure of Invention

In view of this, the present invention provides a feeding pipe, a nozzle and a gasification furnace, so as to solve the problem of poor reaction efficiency of the coriolis furnace in the prior art due to the coaxial jet form of the three nozzles.

In order to achieve the above object, an aspect of the present invention provides a supply pipe;

the feed pipe comprises a main pipe and a sleeve pipe, the main pipe is provided with a first channel extending in a spiral mode and used for conveying a first fuel, the sleeve pipe is sleeved outside the main pipe, at least part of inner side wall of the sleeve pipe and corresponding outer side wall of the main pipe are arranged at intervals to form a second channel extending in a spiral mode together, and the second channel is used for conveying a second fuel, so that the feed pipe can provide a rotational flow mixing material formed by the first fuel and the second fuel.

Through the technical scheme, the main pipe is provided with the main pipe and the sleeve pipe, the main pipe adopts the spiral first channel to convey the first fuel, so that the main pipe can spray the first fuel in a rotational flow mode, the feed pipe adopts the spiral second channel to convey the second fuel, so that the second fuel can be sprayed in a rotational flow mode through the second channel formed by the sleeve pipe and the main pipe, and further the feed pipe can provide rotational flow mixing materials formed by the first fuel and the second fuel, and the mixing of the first fuel and the second fuel is more uniform; taking the feeding pipe used on the nozzle of the gasification furnace as an example, the feeding pipe with the 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, obviously improve the micro-mixing efficiency of the first fuel and the second fuel, and further improve the gasification efficiency.

Preferably, all of the inner side wall of the sleeve is spaced from the outer side wall of the main pipe, and the cross section of the second passage is an annular structure.

Preferably, a swirling portion is provided in the second passage, the swirling portion being provided to extend in a spiral direction of the second passage, and the swirling portion being provided on an inner sidewall of the sleeve and/or an outer sidewall of the main pipe.

Preferably, the second passage includes a plurality of the swirling portions arranged at intervals.

Preferably, the inlet side of the thimble is sealingly mountable to the exterior of the main tube by a cartridge assembly, and the cartridge assembly has a feed inlet for the flow of the second fuel into the second passage.

A second aspect of the invention provides a nozzle;

the nozzle includes an igniter and a feed tube of any of the above that extends helically around an outer periphery of the igniter and is capable of providing the swirl composition to the igniter, the igniter configured to be capable of an ignition operation to ignite the swirl composition.

Preferably, the nozzle comprises a plurality of the supply pipes arranged at intervals.

Preferably, the nozzle comprises a distributor including a trough with an upward opening for accommodating the first fuel, the distributor including a plurality of distribution channels provided to extend obliquely downward from a bottom wall of the trough, and bottom end openings of the plurality of distribution channels respectively communicating with inlets of the plurality of main pipes; and/or

The nozzle comprises a distributor, the distributor comprises an annular pipe and a plurality of branch pipes, the annular pipe comprises a feed inlet for the second fuel to flow in and a discharge outlet for the second fuel to discharge, inlets of the branch pipes are respectively communicated with the discharge outlets of the annular pipe, and outlets of the branch pipes are respectively communicated with the inlets of the sleeve pipes.

Preferably, the nozzle comprises a cooler arranged to enable a desuperheating treatment of the supply pipe.

Preferably, the cooler is of a heat exchange type structure.

A third aspect of the invention provides a gasification furnace;

the gasification furnace comprises the nozzle.

Drawings

FIG. 1 is a schematic diagram of an application structure of an embodiment of a supply pipe provided by the present invention;

FIG. 2 is a schematic structural view of an embodiment of the feed tube of FIG. 1;

FIG. 3 is a schematic view of a connection structure of an embodiment of the supply pipe of FIG. 1;

FIG. 4 is a schematic side sectional view of the structure of FIG. 1;

fig. 5 is a schematic view of the lateral cross-sectional structure of fig. 1.

Description of the reference numerals

1. A main tube; 2. a sleeve; 3. a swirling portion; 4. a clip member; 5. an igniter; 6. a housing; 7. an oxidant conduit; 8. a combustion conduit; 9. a fuel dispenser; 10. a loop pipe; 11. pipe distribution; 12. a distributor; 13. a trough; 14. a material distributing channel; 15. a cooler; 16. a water inlet; 17. and (7) a water outlet.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

As shown in fig. 1 to 5, the present invention provides a feed pipe, which comprises a main pipe 1 and a sleeve 2, wherein the main pipe 1 is provided with a first channel extending spirally for conveying a first fuel, the sleeve 2 is sleeved outside the main pipe 1, and at least part of the inner side wall of the sleeve 2 is arranged at a distance from the corresponding outer side wall of the main pipe 1 to form a second channel extending spirally together for conveying a second fuel, so that the feed pipe can provide a rotational flow mixture formed by the first fuel and the second fuel.

In an alternative embodiment of the invention, an igniter 5 is centrally located in the feed pipe to facilitate ignition of the mixed fuel of the first and second fuels. Be responsible for 1 and sleeve pipe 2 can communicate with the combustion duct 8 that lets in first fuel or second fuel respectively, when adopting oxygen to encircle the buggy and produce and make, be responsible for 1 and the combustion duct 8 intercommunication that lets in the buggy, sleeve pipe 2 and the combustion duct 8 intercommunication that lets in oxygen, when adopting buggy to encircle oxygen and produce and make, be responsible for 1 and the combustion duct 8 intercommunication that lets in oxygen, sleeve pipe 2 and the combustion duct 8 intercommunication that lets in the buggy. In order to facilitate the operation of mixing and igniting the first fuel and the second fuel, in the preferred embodiment of the present invention, an oxidant conduit 7 for filling the oxidant for the preheating operation may be provided at the position of the fuel mixing cavity of the first fuel and the second fuel, and preferably, the oxidant conduit 7 and the combustion conduit 8 are concentrically provided at the central position of the space surrounded by the main pipe 1 and the sleeve 2.

In an alternative embodiment of the present invention, the entire inner side wall of the casing 2 is spaced from the outer side wall of the main pipe 1, and the cross section of the second channel is in an annular structure, so as to facilitate the delivery of the second fuel and ensure the final ejection in a rotating manner, thereby enabling the feed pipe to better provide the swirling mixing material formed by the first fuel and the second fuel.

In an alternative embodiment of the invention, a swirl portion 3 is provided in the second passage, the swirl portion 3 being arranged to extend in a helical direction of the second passage, and the swirl portion 3 being provided on an inner sidewall of the sleeve 2 and/or an outer sidewall of the main pipe 1. The swirling portion 3 may be a projection/groove extending in the radial direction of the main pipe 1 to the casing 2. In a further alternative embodiment of the invention, the second passage comprises a plurality of swirl portions 3 of the price setting. The plurality of swirling portions 3 act on the second fuel in the second passage together, so that a flowing speed difference is generated between the second fuel and the first fuel, and swirling mixed materials can be formed more uniformly and rapidly when the first fuel and the second fuel are in contact conveniently.

The swirling portion 3 may be specifically a groove extending along the inner side wall of the sleeve 2 and/or the outer side wall of the main pipe 1, and the groove is configured to form a directional cavity, so that the first fuel can be guided to generate swirling flow, and simultaneously, a flow speed difference is generated between the first fuel and the second fuel in the radial direction of the conveying pipe body (the main pipe and the sleeve) of the first fuel and the second fuel, so that the mass transfer area of the first fuel and the second fuel is increased, and the mixing efficiency of the first fuel and the second fuel can be increased.

In an alternative embodiment of the present invention, the inlet side of the thimble 2 can be provided with a sealing means for sealing the main pipe 1 by means of a clamping member 4, and the clamping member 4 is provided with a feed inlet for the second fuel to flow into the second passage, the arrangement of the clamping member 4 improves the stability of the overall structure of the feed pipe, facilitates the control of the fuel feed to the main pipe 1 and the thimble 2 separately, and facilitates the adaptation of the feed pipe to the different feed requirements of the first fuel and the second fuel during the application process. In a further alternative embodiment of the present invention, the clamping member 4 is provided with a pipeline for communicating the combustion pipe 8, and/or the clamping member 4 is provided with a slot or a through hole structure for fixing the position of the combustion pipe 8. So that the whole structure is more compact, thereby effectively avoiding the circuit exposure while reducing the occupied volume.

The present invention provides a nozzle;

the nozzle includes an igniter and a feed tube as described in any of the above, the feed tube extending helically around the circumference of the igniter and capable of providing a swirl composition to the chamber igniter, the igniter configured to be capable of an ignition operation to ignite the swirl composition. In an alternative embodiment of the invention, the nozzle comprises a plurality of supply pipes arranged at intervals. The igniter may be a high temperature electric kettle striking device. In a further alternative embodiment of the invention, a fuel distributor 9 is included for connecting the combustion conduit 8 connected to deliver the first or second fuel to different feed pipes, the fuel distributor 9 connecting the first or second fuel to the fuel conduit 8 connected to the main pipe 1 or the quill 2 to ensure that there are a plurality of feed pipes receiving the same fuel for control of the production operation.

In an alternative embodiment of the invention, the nozzle comprises a dispenser 12, which dispenser 12 comprises a trough 13 opening upwards for receiving the first fuel; the distributor 12 comprises a plurality of distributing channels 14, the distributing channels 14 are arranged to extend from the bottom wall of the feed chute 13 in a downward inclined manner, and the bottom end openings of the distributing channels 14 are respectively communicated with the inlets of the main pipes 1. In other embodiments of the present invention, the injector comprises a distributor 12, the distributor 12 comprises a circular pipe 10 and a plurality of branch pipes 11, the circular pipe 10 comprises a feeding port for feeding the second fuel and a discharging port for discharging the second fuel, and the inlets of the plurality of branch pipes 11 are respectively communicated with the discharging ports of the circular pipe 10, and the outlets of the plurality of branch pipes 11 are respectively communicated with the inlets of the casing 2. The above structure is applied to a gasifier structure, the first fuel can be coal powder, and the second fuel can be oxygen.

Through the setting of above-mentioned structure, can realize that the many unit nozzles in gasifier top arrange, every unit nozzle is coaxial whirl form, has improved the mixing velocity and the reaction efficiency between the material, guarantees that fine coal and oxygen can burn out and accomplish gasification reaction in shorter dwell time, consequently can effectively reduce the design size of gasifier, has solved present industrial gasification stove design size great, the higher problem of cost. Meanwhile, the flat flame type burner divides a coal line into a plurality of coal channels by using the distributor to enter the gasification furnace, and ensures uniform flow of pulverized coal in each coal channel, so that the number of the coal lines can be reduced, a control system of the whole pulverized coal conveying system is reduced, and the investment cost is further reduced.

In an alternative embodiment of the invention, the nozzle comprises a cooler 15, the cooler 15 being arranged to cool the supply conduit. The phenomenon that the service life of the nozzle is reduced due to the fact that the central temperature of jet flow is high due to the excessively concentrated nozzles due to the fact that the distance between the nozzles is low is avoided. In a further alternative embodiment of the invention, the cooler 15 is of a heat exchange type construction.

In a further alternative embodiment of the invention, the cooler 15 comprises a housing 6 and a water inlet 16 and a water outlet 17 arranged on diametrically opposite sides of the housing 6, and liquid (which may be water or other liquid for cooling) enters at the water inlet 16 and flows out from the water outlet 17 to absorb the temperature of the housing 6 and the inner periphery thereof, thereby cooling the nozzle as a whole as the liquid flows out.

The invention also provides a gasification furnace, which comprises any one of the nozzles.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, various simple modifications can be made to the technical solution of the invention, and in order to avoid unnecessary repetition, various possible combinations of the invention will not be further described. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims

1. A feed pipe, characterized in that the feed pipe comprises a main pipe (1) and a sleeve pipe (2), the main pipe (1) is provided with a first channel which extends spirally for conveying a first fuel, the sleeve pipe (2) is sleeved outside the main pipe (1), and at least part of the inner side wall of the sleeve pipe (2) and the corresponding outer side wall of the main pipe (1) are arranged at intervals to form a second channel which extends spirally together for conveying a second fuel, so that the feed pipe can provide the rotational flow mixing formed by the first fuel and the second fuel.

2. The supply pipe according to claim 1, characterized in that all the internal side walls of the sleeve (2) are spaced from the external side walls of the main pipe (1) and in that the cross section of the second channel is of annular configuration.

3. The supply pipe according to claim 2, characterized in that a swirl portion (3) is provided in the second channel, the swirl portion (3) being arranged to extend in the helical direction of the second channel, and the swirl portion (3) being arranged at the inner side wall of the sleeve (2) and/or the outer side wall of the main pipe (1).

4. The supply pipe according to claim 3, characterized in that said second channel comprises a plurality of said cyclone portions (3) arranged at intervals.

5. The supply pipe according to any one of claims 1 to 4, characterized in that the inlet side of the casing (2) can be sealingly fitted out of the main pipe (1) by means of a cartridge (4), and that the cartridge (4) has an inlet opening for the second fuel to flow into the second channel.

6. A nozzle comprising an igniter and a feed tube according to any one of claims 1 to 5, the feed tube extending helically around the periphery of the igniter and being capable of providing the swirl composition to the igniter, the igniter being arranged to be capable of an ignition operation to ignite the swirl composition.

7. The nozzle of claim 6, wherein the nozzle comprises a plurality of the supply tubes arranged at intervals.

8. The nozzle according to claim 7, characterized in that the nozzle comprises a distributor (12), the distributor (12) comprises a trough (13) with an upward opening for containing the first fuel, the distributor (12) comprises a plurality of distribution channels (14), the distribution channels (14) are arranged to extend from the bottom wall of the trough (13) in a downward inclination, and the bottom end openings of the distribution channels (14) are respectively communicated with the inlets of the main pipes (1); and/or

The nozzle comprises a distributor (12), the distributor (12) comprises an annular pipe (10) and a plurality of branch pipes (11), the annular pipe (10) comprises a feeding hole for the second fuel to flow in and a discharging hole for the second fuel to discharge, the inlets of the branch pipes (11) are respectively communicated with the discharging holes of the annular pipe (10), and the outlets of the branch pipes (11) are respectively communicated with the inlets of the sleeve pipes (2).

9. Nozzle according to any of claims 6-8, characterized in that the nozzle comprises a cooler (15), which cooler (15) is arranged to cool the supply pipe.

10. Nozzle according to claim 9, characterized in that the cooler (15) is of heat-exchange type construction.

11. A gasification furnace, characterized in that it comprises a nozzle according to any one of claims 6 to 10.