Coal-water slurry process burner device

Abstract

The present invention discloses a coal-water slurry process burner device, including a central oxygen channel provided with a spherical central oxygen nozzle, a middle ring oxygen channel and an outer ring coal-water slurry channel which surround the central oxygen channel from the inside to the outside in sequence, wherein the middle ring oxygen channel is closed at the end close to the central oxygen nozzle and is connected to the outer ring coal-water slurry channel through a middle ring dispersion hole; the end of the outer ring coal-water slurry channel has a spherical coal-water slurry nozzle; the coal-water slurry nozzle surrounds the central oxygen nozzle from the outside and maintains a predetermined distance, and the two are respectively provided with a radially penetrating central oxygen dispersion hole and an outer ring coal-water slurry dispersion hole. In this way, by setting up a double oxygen channel, the central oxygen is dispersed once and the middle ring oxygen is dispersed by secondary injection, thereby improving the atomization effect of the coal-water slurry; through the spherical nozzle, the two-stage dispersion design, and the further dispersion hole angle and size design, the wear of the coal-water slurry on the nozzle is reduced, and the service life of the coal-water slurry burner is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal chemical industry, and in particular to a water-coal slurry process burner device. Background Art

[0002] Coal gasification is the leading technology in coal chemical industry. It is divided into lump coal, water-coal slurry and pulverized coal gasification according to the type of raw materials. There are many factors that affect the stable operation of water-coal slurry gasification equipment. Among them, the life of water-coal slurry gasification nozzle has become an important factor affecting the long-term stable operation of the gasification equipment.

[0003] The water-coal slurry gasification devices currently in operation include Texaco gasification technology, multi-nozzle water-coal slurry gasification technology, and Tsinghua furnace water-coal slurry gasification device. All of them have improved the gasification nozzle to enhance its atomization effect, improve gasification performance, and extend the service life of the burner. Among them, Texaco gasification technology uses a three-channel premixed process burner, and the distance between the end face of the central oxygen channel and the outer oxygen channel is about tens of millimeters. Since the central oxygen channel and the coal slurry channel are in an internal mixing form, the central oxygen and the coal slurry are mixed in the chamber, and the coal slurry is accelerated, resulting in severe metal abrasion. After a production cycle, the burner wall is worn very thin and the service life is significantly shortened.

[0004] The multi-nozzle opposed water-coal slurry gasification technology adopts a three-channel pre-filming and external mixed airflow atomizing nozzle. The lower end faces of the three channels are basically on the same horizontal plane. The distance between the central oxygen channel and the end face of the outer oxygen channel is only a few millimeters. Due to the formation of a controllable coal slurry film thickness, it has better atomization performance than the pre-mixing type. At the same time, the pre-filming burner has made corresponding adjustments to the jet angle of the oxygen channel, and the atomization effect has been improved.

[0005] However, in general, the service life of the water-coal slurry gasification nozzle is 3-5 months. The reason for its short life is the long-term wear of the water-coal slurry nozzle, the increase of the coal slurry annular gap, the deterioration of the atomization effect, and the impact on the carbon conversion rate; the wear of the burner causes biased flow, which also affects the service life of the refractory bricks. Summary of the invention

[0006] The object of the present invention is to provide a coal-water slurry process burner device, which has a longer service life and a better atomization effect.

[0007] To achieve the above object, the present invention provides a coal-water slurry process burner device, comprising:

[0008] A central oxygen channel extending in the axial direction, wherein a spherical central oxygen nozzle is arranged at the end of the central oxygen channel;

[0009] A middle ring oxygen channel and an outer ring water-coal slurry channel, which surround the central oxygen channel in sequence from the inside to the outside;

[0010] The middle ring oxygen channel is closed at the end close to the central oxygen nozzle, and is connected to the outer ring water-coal slurry channel through the middle ring dispersion hole;

[0011] The end of the outer ring water-coal slurry channel is provided with a spherical water-coal slurry nozzle; the water-coal slurry nozzle surrounds the central oxygen nozzle from the outside and maintains a predetermined distance, and both are respectively provided with a radially penetrating central oxygen dispersion hole and an outer ring water-coal slurry dispersion hole.

[0012] Preferably, the water-coal slurry nozzle and the central oxygen nozzle are concentrically arranged.

[0013] Preferably, the end of the middle ring oxygen channel close to the central oxygen nozzle is welded and closed to the central oxygen channel.

[0014] Preferably, the angles between the middle ring dispersion hole, the central oxygen dispersion hole and the outer ring water-coal slurry dispersion hole and the axis are all less than 45 degrees.

[0015] Preferably, the middle ring dispersion holes, the central oxygen dispersion holes and the outer ring water-coal slurry dispersion holes are evenly distributed.

[0016] Preferably, the diameter of the middle ring dispersion holes ranges from 1 mm to 8 mm.

[0017] Preferably, the diameter of the central oxygen dispersion hole is in the range of 1 mm to 8 mm.

[0018] Preferably, the diameter of the outer ring water-coal slurry dispersion holes ranges from 2 mm to 10 mm.

[0019] The water-coal slurry process burner device provided by the present invention comprises a central oxygen channel with a spherical central oxygen nozzle at the end, a middle ring oxygen channel and an outer ring water-coal slurry channel which surround the central oxygen channel from the inside to the outside in sequence, the middle ring oxygen channel is closed at the end close to the central oxygen nozzle, and is connected to the outer ring water-coal slurry channel through the middle ring dispersion hole; the end of the outer ring water-coal slurry channel has a spherical water-coal slurry nozzle; the water-coal slurry nozzle surrounds the central oxygen nozzle from the outside and maintains a predetermined distance, and the two are respectively provided with a radially penetrating central oxygen dispersion hole and an outer ring water-coal slurry dispersion hole. In this way, by setting up a double oxygen channel, the central oxygen is dispersed once and the middle ring oxygen is dispersed by secondary injection, thereby improving the atomization effect of the water-coal slurry; through the spherical nozzle, the two-stage dispersion design, and the further dispersion hole angle and size design, the wear of the water-coal slurry on the nozzle is reduced, and the service life of the water-coal slurry burner is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a water-coal slurry process burner device provided by the present invention in a specific implementation manner.

[0022] Figure 1 The reference numerals in the figures are as follows:

[0023] 1-central oxygen channel; 2-middle ring oxygen channel; 3-outer ring water-coal slurry channel; 4-central oxygen nozzle; 5-water-coal slurry nozzle; 6-middle ring dispersion hole; 7-central oxygen dispersion hole; 8-outer ring water-coal slurry dispersion hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The core of the present invention is to provide a water-coal slurry process burner device, which has a longer service life and better atomization effect.

[0026] Please refer to Figure 1 , Figure 1 It is a structural schematic diagram of a water-coal slurry process burner device provided by the present invention in a specific implementation manner.

[0027] In a first specific embodiment, the water-coal slurry process burner device provided by the present invention includes two oxygen channels, namely a central oxygen channel 1 and a middle ring oxygen channel 2 .

[0028] The central oxygen channel 1 extends along the axial direction (vertical direction in the figure) of the burner device and is located at the innermost center of the device. The end (bottom end in the figure) of the central oxygen channel 1 is provided with a central oxygen nozzle 4. The central oxygen nozzle 4 is generally spherical and has a generally spherical inner cavity. The central oxygen nozzle 4 is also provided with a plurality of central oxygen dispersion holes 7, which penetrate the central oxygen nozzle 4 in the radial direction (i.e., the thickness direction), thereby connecting the inner and outer cavities.

[0029] The middle ring oxygen channel 2 is arranged around the central oxygen channel 1 and also extends in the axial direction; the two can be coaxial, so from the cross section, the central oxygen channel 1 is circular and the middle ring oxygen channel 2 is a ring shape surrounding it.

[0030] The bottom end of the middle ring oxygen channel 2 is closed near the central oxygen nozzle 4, for example, the two can be welded together, so that the oxygen therein cannot flow out through the bottom of the annular channel.

[0031] However, a plurality of middle ring dispersion holes 6 are provided on the side wall of the middle ring oxygen channel 2 , so the oxygen in the middle ring oxygen channel 2 can transversely pass through the middle ring dispersion holes 6 into the space outside thereof, namely, the outer ring water-coal slurry channel 3 .

[0032] Similarly, the outer ring water-coal slurry channel 3 is arranged around the middle ring oxygen channel 2 and also extends in the axial direction.

[0033] The outer ring water-coal slurry channel 3 is located at the outermost position of the device, and a water-coal slurry nozzle 5 is arranged at its end. The outer ring water-coal slurry channel 3 is arranged at the outermost layer to cool and protect the burner. In addition, in practical applications, an outer cooling water jacket can be provided according to the cooling effect to protect the burner head and prevent the local drying of the water-coal slurry from clogging the nozzle due to the heat radiation in the furnace.

[0034] The water-coal slurry nozzle 5 is also substantially spherical, and has a substantially spherical inner cavity therein, so that the central oxygen nozzle 4 can be wrapped therein. The water-coal slurry nozzle 5 and the central oxygen nozzle 4 can be concentrically arranged, and of course, an appropriate predetermined distance should be maintained between the two.

[0035] The coal-water slurry nozzle 5 is also provided with a plurality of outer ring coal-water slurry dispersion holes 8, which penetrate the coal-water slurry nozzle 5 in the radial direction (ie, thickness direction), thereby connecting the inner and outer cavities thereof.

[0036] In addition, the water-coal slurry process burner device provided by the present invention can be further improved.

[0037] For example, the angles between the middle ring dispersion hole 6, the central oxygen dispersion hole 7 and the outer ring water-coal slurry dispersion hole 8 and the axis (i.e., the center line of the central oxygen channel 1) can all be set to be less than 45 degrees, for example, 25 degrees.

[0038] In addition, the middle ring dispersion holes 6, the central oxygen dispersion holes 7 and the outer ring water-coal slurry dispersion holes 8 can each be evenly distributed in the area where they are located.

[0039] The diameter ranges of the above three can also be specifically set as follows: the diameter range of the middle ring dispersion hole 6 is 1mm-8mm, the diameter range of the central oxygen dispersion hole 7 is 1mm-8mm, and the diameter range of the outer ring water-coal slurry dispersion hole 8 is 2mm-10mm.

[0040] The water-coal slurry process burner device provided by the present invention comprises a central oxygen channel with a spherical central oxygen nozzle at the end, a middle ring oxygen channel and an outer ring water-coal slurry channel which surround the central oxygen channel from the inside to the outside in sequence, the middle ring oxygen channel is closed at the end close to the central oxygen nozzle, and is connected to the outer ring water-coal slurry channel through the middle ring dispersion hole; the end of the outer ring water-coal slurry channel has a spherical water-coal slurry nozzle; the water-coal slurry nozzle surrounds the central oxygen nozzle from the outside and maintains a predetermined distance, and the two are respectively provided with a radially penetrating central oxygen dispersion hole and an outer ring water-coal slurry dispersion hole. In this way, by setting up a double oxygen channel, the central oxygen is dispersed once and the middle ring oxygen is dispersed by secondary injection, thereby improving the atomization effect of the water-coal slurry; through the spherical nozzle, the two-stage dispersion design, and the further dispersion hole angle and size design, the wear of the water-coal slurry on the nozzle is reduced, and the service life of the water-coal slurry burner is improved.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] The water-coal slurry process burner device provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A coal-water slurry process burner device, characterized in that: include: A central oxygen channel (1) extending in the axial direction, wherein a spherical central oxygen nozzle (4) is provided at the end of the central oxygen channel (1), and the central oxygen nozzle (4) has a spherical inner cavity; A middle ring oxygen channel (2) and an outer ring water-coal slurry channel (3), both of which surround the central oxygen channel (1) from the inside to the outside in sequence, the middle ring oxygen channel (2) extends in the axial direction and is coaxial with the central oxygen channel (1), the central oxygen channel (1) is circular, the middle ring oxygen channel (2) is in the shape of a ring surrounding the central oxygen channel, and the outer ring water-coal slurry channel (3) is arranged around the middle ring oxygen channel (2) and also extends in the axial direction; The middle ring oxygen channel (2) is closed at the end close to the central oxygen nozzle (4), and is connected to the outer ring water-coal slurry channel (3) through the middle ring dispersion hole (6); The end of the outer ring water-coal slurry channel (3) is provided with a spherical water-coal slurry nozzle (5), and the inside of the water-coal slurry nozzle (5) has a spherical inner cavity; the water-coal slurry nozzle (5) surrounds the central oxygen nozzle (4) from the outside and maintains a predetermined distance, and the two are respectively provided with a radially penetrating central oxygen dispersion hole (7) and an outer ring water-coal slurry dispersion hole (8); The included angles between the middle ring dispersion hole (6), the central oxygen dispersion hole (7) and the outer ring water-coal slurry dispersion hole (8) and the axis are all less than 45 degrees; The water-coal slurry nozzle (5) and the central oxygen nozzle (4) are arranged concentrically; The end of the middle ring oxygen channel (2) close to the central oxygen nozzle (4) is welded and sealed to the central oxygen channel (1); The middle ring dispersion holes (6), the central oxygen dispersion holes (7) and the outer ring water-coal slurry dispersion holes (8) are evenly distributed; The diameter of the middle ring dispersion hole (6) ranges from 1 mm to 8 mm; The diameter of the central oxygen dispersion hole (7) ranges from 1 mm to 8 mm; The diameter of the outer ring water-coal slurry dispersion hole (8) ranges from 2 mm to 10 mm.

Images