Gasification furnace burner for dry feed pulverized coal gasification process and gasification furnace

Abstract

The utility model provides a gasification furnace burner and a gasification furnace for the gasification process of dry feed pulverized coal, and the gasification furnace burner comprises a first central pipeline, a second central pipeline, a gas inlet pipe and a gas outlet pipe, a first annular conduit concentrically surrounding the first central conduit, the first annular conduit comprising a plurality of first outlets at a head end of the gasifier burner; a second annular conduit concentrically surrounding the first annular conduit, the second annular conduit including a plurality of second outlets at a head end of the gasifier burner; the third annular pipeline concentrically surrounds the second annular pipeline to form the outer side wall of the gasifier burner, and the head end of the first central pipeline is in fluid communication with the head end of the third annular pipeline through a connecting channel; the nozzle is characterized in that the first central pipeline is used for allowing cooling water to enter, and the third annular pipeline is used for allowing the cooling water to leave, so that the cooling water flows along the inner sides of the head end wall and the outer side wall of the nozzle of the gasification furnace.

Description

Technical Field

[0001] The utility model relates to a gasifier burner and a gasifier used in a dry-feed coal powder gasification process. Background Art

[0002] Coal gasification technology is to convert solid coal into gaseous hydrocarbons, CO, H 2 The purpose of the technology is to obtain clean energy and chemical raw materials. The principle is to make coal, coal coke or petroleum coke react with gasifying agents (air, oxygen, water vapor, hydrogen, etc.) at a certain temperature and pressure to convert the organic matter in coal, coal coke or petroleum coke into coal gas. The entrained-bed coal gasification process can be divided into water-coal slurry gasification and pulverized coal gasification. Compared with water-coal slurry gasification, pulverized coal gasification has the characteristics of high gasification efficiency, good performance indicators, and a wide range of coal applications, and has higher technical, economic and environmental advantages.

[0003] In the pulverized coal gasification process, the pulverized coal burner is the core equipment of the gasifier. It is expensive, and the maintenance and replacement costs are high, which has a great impact on the economic efficiency of the gasifier operation. Since the burner is placed in the gasifier, the working environment is harsh and its life is generally short. Therefore, the service life of the pulverized coal burner has become the key to the long-term operation of the gasifier. The part of the pulverized coal burner that is most prone to ablation is the fire-facing surface of the burner. The main cause of ablation comes from the high-temperature radiation in the gasifier or direct flame burning. Although the prior art has conducted a lot of research on gasifier burners, there are still many problems to be solved.

[0004] In addition, the food processing industry, papermaking industry and coal chemical downstream will produce a large amount of organic waste liquid, which may contain toxic and harmful substances such as benzene, phenol, phenanthrene, naphthalene, anthracene, quinone, etc., and may also contain organic substances such as carbohydrates, proteins, oils, lignin, etc. Organic waste liquid can easily cause eutrophication of water quality, which is quite harmful and requires complex process methods to treat, such as physical method, extraction method, adsorption method, concentration method, biodegradation method, etc. The complex composition of organic waste liquid is the key factor that makes it difficult to treat or degrade. The increasingly high environmental protection requirements have caused chemical companies to invest a lot of costs to treat the waste liquid generated in production.

[0005] Therefore, it is necessary to develop a burner that can realize the function of ignition and start-up and the addition of waste liquid after ignition, while ensuring the cooling of the burner, increasing the service life of the burner, shortening the maintenance cycle, increasing production capacity and reducing costs. Utility Model Content

[0006] Aspects and advantages of the present invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the present invention.

[0007] The utility model provides a gasifier burner for a dry-feed coal powder gasification process, comprising: a first central pipe having a central axis; a first annular pipe concentrically surrounding the first central pipe, the first annular pipe comprising a plurality of first outlets at the head end of the gasifier burner; a second annular pipe concentrically surrounding the first annular pipe, the second annular pipe comprising a plurality of second outlets at the head end of the gasifier burner; and a third annular pipe concentrically surrounding the second annular pipe to form an outer side wall of the gasifier burner, the head end of the first central pipe being fluidly connected to the head end of the third annular pipe through a connecting channel; it is characterized in that the first central pipe is used for the entry of cooling water, and the third annular pipe is used for the exit of the cooling water, so that the cooling water flows along the head end wall and the inner side of the outer side wall of the gasifier burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] A complete and enabling disclosure of the present invention, including the best mode thereof, for one of ordinary skill in the art is set forth in the specification with reference to the accompanying drawings, in which:

[0009] Figure 1 A longitudinal cross-sectional view showing a gasifier burner for a dry feed pulverized coal gasification process according to an embodiment;

[0010] Figure 2 A longitudinal sectional view showing a gasifier burner for a dry feed pulverized coal gasification process according to another embodiment;

[0011] Figure 3 A longitudinal sectional view showing a gasifier burner for a dry feed pulverized coal gasification process according to another embodiment; and

[0012] Figure 4 An end view of a gasifier burner for a dry feed pulverized coal gasification process is shown according to another embodiment. DETAILED DESCRIPTION

[0013] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are shown in the accompanying drawings. Each example is provided by way of explanation of the present invention rather than by way of limitation. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope of the present invention. For example, a feature shown or described as part of one embodiment may be used together with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover such modifications and variations as fall within the scope of the appended claims and their equivalents.

[0014] Figure 1A longitudinal cross-sectional view of a gasifier burner for a dry feed pulverized coal gasification process according to an embodiment is shown. The gasifier burner may be made of a co-annular duct, which includes a first central duct 10 having a central axis; a first annular duct 20, which concentrically surrounds the first central duct 10, and the first annular duct 20 includes a plurality of (e.g., 8, 10, 12, 16) first outlets 25 at the head end of the gasifier burner; a second annular duct 30, which concentrically surrounds the first annular duct 20, and the second annular duct 30 includes a plurality of (e.g., 8, 10, 12, 16) second outlets 35 at the head end of the gasifier burner; and a third annular duct 40, which concentrically surrounds the second annular duct 30 to form an outer side wall of the gasifier burner. The head end of the first central duct 10 may be fluidically connected to the head end of the third annular duct 40 through a connecting channel 45.

[0015] The burner is used to supply organic waste liquid to the dry feed gasifier and to carry out in the dry feed vaporizer. To this end, the burner will provide a flow of organic waste liquid and oxygen with jacket cooling.

[0016] In one embodiment, the first central pipe 10 can be used for the entry of cooling water 13, and the third annular pipe 40 can be used for the exit of cooling water 13, so that the cooling water 13 flows along the head end wall and the inner side of the outer side wall of the gasifier burner. In one embodiment, the first annular pipe 20 can be used for supplying fuel 23, and the fuel 23 exits from a plurality of first outlets 25, and the second annular pipe 30 can be used for supplying oxygen 33, and the oxygen 33 exits from a plurality of second outlets 35, so that the fuel 23 is atomized. In one embodiment, the fuel 23 may include organic waste liquid or diesel.

[0017] In one embodiment, the connecting channel 45 for the return flow of the cooling water 13 may form a part of the head end of the gasifier burner, so that the gasifier burner has a flat head end wall. The cooling water 13 may flow along the inner side of the head end wall of the gasifier burner.

[0018] In one embodiment, the head end of the first central pipe 10 may be retracted relative to the head end of the third annular pipe 40, thereby forming a truncated cone portion between the head end of the first central pipe 10 and the head end of the third annular pipe 40. The cooling water 13 may flow along the side wall of the truncated cone portion to cool the truncated cone portion. The plurality of first outlets 25 and the plurality of second outlets 35 may be located on the side wall of the truncated cone portion. Preferably, the co-annular nozzle may be perpendicular to the side wall of the truncated cone portion.

[0019] In one embodiment, each of the plurality of first outlets 25 may concentrically surround each of the plurality of second outlets 35 to form a co-annular nozzle. The organic waste liquid / diesel will be atomized through the nozzle, and the oxygen 33 provided through the plurality of second outlets 35 can further help ensure the atomization performance.

[0020] The annular nozzle formed by the plurality of first outlets 25 and the plurality of second outlets 35 may be arranged symmetrically around the central axis to improve the uniformity of heating, such as Figure 4 As shown. The focus P of the co-annular nozzle is on the central axis. In one embodiment, the frustoconical portion has a side angle α in the range of 30 to 120 degrees, preferably equal to 60 degrees.

[0021] The above-mentioned co-annular nozzle may have the following features:

[0022] a. Liquid fuel velocity is in the range of 5m / s to 20m / s;

[0023] b. The oxygen velocity is in the range of 50m / s to 100m / s;

[0024] c. The droplet size produced by atomization is in the range of 0 to 500 μm, preferably in the range of 0 to 250 μm;

[0025] d. The nozzle should ensure that the ratio of length to diameter is in the range of 3 to 20, preferably in the range of 5 to 20.

[0026] Figure 2 A longitudinal cross-sectional view of a gasifier burner for dry feed pulverized coal gasification process according to another embodiment is shown. Figure 1 The gasifier burner shown is similar, but incorporates a start-up burner function. In this embodiment, the gasifier burner may also include a second central conduit 50, which is concentrically surrounded by the first central conduit 10, and the second central conduit 50 has a third outlet at the head end of the gasifier burner.

[0027] In one embodiment, the gasifier burner may further include a high pressure (HV) igniter 60, which is positioned in the second central duct 50 at the third outlet. The high pressure igniter 60 is aimed at the focal point P of the co-annular nozzle. The nitrogen purge (N 2 )53 can be supplied through the second central conduit 50 and exit from the third outlet.

[0028] During the startup phase, the burner functions as a startup burner, diesel is supplied through the first annular conduit 20, and oxygen 33 is supplied through the second annular conduit 30. The diesel / oxygen mixture will be ignited by the high-pressure igniter 60 at the focal point P, and the flame will stabilize in the truncated cone region and toward the reaction zone of the gasifier. Once burner ignition is confirmed, the high-pressure igniter 60 will be turned off.

[0029] During normal operation, the diesel will switch to the organic waste liquid and oxygen 33 will be supplied through the second annular pipe 30. The mixture of organic waste liquid droplets and oxygen will be supplied to the reaction zone of the gasifier and participate in the gasification reaction.

[0030] Cooling water flow along the inside of the frusto-conical portion of the burner and the flat head end wall will provide sufficient cooling to protect the nozzle and burner from overheating.

[0031] Figure 3 A longitudinal cross-sectional view of a gasifier burner for dry feed pulverized coal gasification process according to another embodiment is shown. Figure 2 The gasifier burner shown is similar. This gasifier burner is not used for startup and only uses organic waste liquid. In this embodiment, the gasifier burner can be changed to include an infrared thermal imager 70, which is positioned in the second central pipe 50 at the third outlet. The infrared thermal imager 70 can detect the overall temperature field of the combustion zone of the reaction furnace and can also determine the local temperature. Purge nitrogen 53 can be supplied through the second central pipe 50 and leave from the third outlet to protect the infrared thermal imager 70.

[0032] This written description uses examples to disclose the present invention, including the best mode, and also enables any person skilled in the art to practice the present invention, including making and using any device or system and performing any incorporated method. The patentable scope of the present invention is defined by the claims and may include other examples that occur to a person skilled in the art. If these other examples include structural elements that are not different from the literal language of the claims, or if they include equivalent structural elements that have insubstantial differences from the literal language of the claims, these other examples are intended to be within the scope of the claims.

Claims

1. A gasifier burner for dry-feed pulverized coal gasification process, comprising: a first central conduit having a central axis; a first annular conduit concentrically surrounding the first central conduit, the first annular conduit comprising a plurality of first outlets at a head end of the gasifier burner; a second annular conduit concentrically surrounding the first annular conduit, the second annular conduit comprising a plurality of second outlets at a head end of the gasifier burner; as well as a third annular pipe, which concentrically surrounds the second annular pipe to form an outer side wall of the gasifier burner, and a head end of the first central pipe is fluidically connected to the head end of the third annular pipe through a connecting channel; It is characterized in that the first central pipe is used for the entry of cooling water, and the third annular pipe is used for the exit of the cooling water, so that the cooling water flows along the inner side of the head end wall and the outer side wall of the gasifier burner.

2. The gasifier burner according to claim 1, characterized in that: The first annular conduit is used to supply fuel, and the fuel exits from the plurality of first outlets. The second annular conduit is used to supply oxygen, and the oxygen exits from the plurality of second outlets, so that the fuel is atomized.

3. The gasifier burner according to claim 2, characterized in that: a. The velocity of the fuel is in the range of 5m / s to 20m / s; b. The velocity of oxygen is in the range of 50m / s to 100m / s; and c. The droplet size produced by atomization is in the range of 0 to 500 μm.

4. The gasifier burner according to claim 3, characterized in that: The droplet size produced by atomization is in the range of 0 to 250 μm.

5. The gasifier burner according to claim 2, characterized in that: The fuel includes organic waste liquid or diesel.

6. The gasifier burner according to claim 1, characterized in that: The connecting passage forms a part of the head end of the gasifier burner, so that the gasifier burner has a flat head end wall.

7. The gasifier burner according to any one of claims 1 to 6, characterized in that: The head end of the first central pipe is retracted relative to the head end of the third annular pipe, thereby forming a truncated cone portion between the head ends of the first central pipe and the third annular pipe, and the multiple first outlets and the multiple second outlets are located on the side wall of the truncated cone portion, perpendicular to the side wall of the truncated cone portion.

8. The gasifier burner according to claim 7, characterized in that: Each of the first plurality of outlets concentrically surrounds each of the second plurality of outlets to form a co-annular nozzle.

9. The gasifier burner according to claim 8, characterized in that: The co-annular nozzle has a length to diameter ratio in the range of 3 to 20.

10. The gasifier burner according to claim 9, characterized in that: The co-annular nozzle has a length to diameter ratio in the range of 5 to 20.

11. The gasifier burner according to claim 8, characterized in that: A co-annular nozzle formed by the plurality of first outlets and the plurality of second outlets is symmetrically arranged around the central axis.

12. The gasifier burner according to claim 7, characterized in that: The frustoconical portion has a side angle in the range of 30 degrees to 120 degrees.

13. The gasifier burner according to claim 12, characterized in that: The frustoconical portion has a side angle equal to 60 degrees.

14. The gasifier burner according to claim 11, characterized in that: Also included is a second central conduit, the second central conduit being concentrically surrounded by the first central conduit, the second central conduit having a third outlet at a head end of the gasifier burner.

15. The gasifier burner according to claim 14, characterized in that: Also included is a high-voltage igniter or an infrared thermal imager, which is positioned in the second central pipe at the third outlet.

16. The gasifier burner according to claim 15, characterized in that: Purge nitrogen is supplied through the second central conduit and exits from the third outlet.

17. A gasifier comprising the gasifier burner according to any one of claims 1 to 16.

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