CN118048175A - Jacket burner assembly for coal water slurry gasifier and water-cooled wall gasifier - Google Patents

Abstract

The application discloses a jacket burner assembly for a coal water slurry gasifier and a water-cooled wall gasifier. A jacket burner assembly for a coal water slurry gasifier comprising: the fuel channel comprises an internal oxygen channel, a coal water slurry channel annularly arranged at the outer side of the internal oxygen channel and an external oxygen channel annularly arranged at the outer side of the coal water slurry channel; the outer wall of the coal water slurry channel is provided with a coal water slurry inlet, the position, facing the coal water slurry inlet, of the inner wall of the coal water slurry channel is provided with a diversion protrusion, and the diversion protrusion protrudes out of the inner wall of the coal water slurry channel; the liquid cooling jacket is arranged on the outer side of the external oxygen channel, a partition plate and a labyrinth channel are arranged in the liquid cooling jacket, the partition plate divides the liquid cooling jacket into an inner side channel and an outer side channel which are relatively independent, the labyrinth channel is arranged on the outer side of an outlet of the external oxygen channel in a surrounding mode, a cooling liquid inlet is formed in the inner side channel, a cooling liquid outlet is formed in the outer side channel, a liquid inlet of the labyrinth channel is communicated with the inner side channel, and a liquid outlet of the labyrinth channel is communicated with the outer side channel. The application effectively cools the burner, reduces the production cost, slows down the scouring of the wall surface of the coal water slurry channel, and prolongs the service life of the burner.

Description

Jacket burner assembly for coal water slurry gasifier and water-cooled wall gasifier

Technical Field

The application relates to the technical field of energy and chemical industry, in particular to a jacket burner assembly for a coal water slurry gasifier and a water-cooled wall gasifier.

Background

The clean and efficient utilization of coal is an important technical topic in the field of energy and environmental protection at present, and is one of key technologies for the sustainable development of national economy in China.

Coal gasification techniques can be classified into the following two types according to the high temperature syngas cooling regime: one is a pulverized coal feeding process represented by the netherlands Shell company, and the other is a coal water slurry feeding process represented by the american GE (orthotexaco) company. In recent years, the domestic coal chemical industry has been developed, and coal gasification technologies of a batch of coal water slurry feeding process routes, such as a four-nozzle furnace, a sublimating furnace and the like, are also emerging.

The burner is used as a key gasification device and usually works under the high-temperature and high-pressure environment, and in order to prolong the service life of the burner, certain cooling measures are needed to be adopted for prolonging the service life of the burner. The traditional coal water slurry burner is mostly in a coil cooling mode, such as a GE coal water slurry process burner and a Huadong university gasification process burner. The coil cooling mode is widely applied at present, but the protection of the coil cooling on the burner is limited, the head of the burner cannot be completely wrapped and protected, meanwhile, the welding position of the cooling water coil and the outer nozzle is easily affected by thermal stress, and the damage in the form of cracks is easily generated in the using process. Due to the above drawbacks of cooling coils, jacket cooling schemes have begun to evolve. The existing water-cooling jacket has the following defects: firstly, the phase-change cooling jacket is provided with a phase-change water cooling jacket, so that a complex control circuit is needed, and the production cost is increased; secondly, the wall surface of the coal water slurry channel is directly flushed after the coal water slurry enters from the inlet, so that the service life of the process burner is shortened.

Disclosure of Invention

The application aims to provide a jacket burner assembly for a coal water slurry gasifier and a water-cooled wall gasifier, which are used for effectively cooling a burner, reducing the production cost, slowing down the scouring of the wall surface of a coal water slurry channel and prolonging the service life of the burner.

The application provides a jacket burner assembly for a coal water slurry gasifier, which comprises the following components: the fuel channel comprises an internal oxygen channel, a coal water slurry channel annularly arranged at the outer side of the internal oxygen channel and an external oxygen channel annularly arranged at the outer side of the coal water slurry channel; the outer wall of the coal water slurry channel is provided with a coal water slurry inlet, the inner wall of the coal water slurry channel is provided with a diversion protrusion towards the position of the coal water slurry inlet, and the diversion protrusion protrudes out of the inner wall of the coal water slurry channel; the liquid cooling jacket is arranged at the outer side of the outer oxygen channel, a partition plate and a labyrinth channel are arranged in the liquid cooling jacket, the partition plate divides the liquid cooling jacket into an inner channel and an outer channel which are relatively independent, the labyrinth channel is arranged at the outer side of an outlet of the outer oxygen channel in a surrounding mode, a cooling liquid inlet is formed in the inner channel, a cooling liquid outlet is formed in the outer channel, a liquid inlet of the labyrinth channel is communicated with the inner channel, and a liquid outlet of the labyrinth channel is communicated with the outer channel.

Optionally, at least three layers of annular spaces are arranged in the labyrinth channel, in any adjacent annular spaces, the annular space on the outer side is annularly arranged outside the annular space on the inner side and is communicated with the annular space on the inner side, the annular space ring on the innermost side is directly annularly arranged on the outer side of the outlet of the outer oxygen channel, the liquid inlet is formed in the annular space on the innermost side, and the liquid outlet is formed in the annular space on the outermost side.

Optionally, a conical injection hole is arranged at the outlet of the external oxygen channel, and the partition plate is cylindrical.

Optionally, the inner wall of the injection hole is provided with the injection hole along the circumferential direction.

Optionally, the partition is directly connected to a top wall of the annular space located at the outermost layer in the labyrinth passage.

Optionally, a guide member extending along an axial spiral is arranged in the outer channel.

Optionally, an oxygen cyclone is arranged in the internal oxygen channel.

Optionally, a coal slurry cyclone is arranged in the coal water slurry channel.

Optionally, the surface of the diversion protrusion facing the coal water slurry inlet comprises a conical drainage surface, and the vertex of the drainage surface is positioned on the central axis of the coal water slurry inlet and extends towards the direction approaching the coal water slurry inlet.

The application also provides a water-cooled wall gasifier, which comprises a furnace body and the jacket burner assembly for the water-coal-slurry gasifier, wherein the furnace body comprises a water-cooled wall, a containing cavity is arranged on the water-cooled wall, at least part of the liquid-cooled jacket is arranged in the containing cavity, and the pressure in the liquid-cooled jacket is larger than the pressure in the furnace body.

By adopting the technical scheme, the method has the following beneficial effects:

The jacket burner assembly for the coal water slurry gasifier and the water-cooled wall gasifier provided by the application comprise an inner side channel, a labyrinth channel and an outer side channel three-stage channel, wherein the cooling liquid flows from the inner side channel to the inner layer of the labyrinth channel, enters the outer side channel from the outer side of the labyrinth channel after passing through the labyrinth channel and flows out from a cooling liquid outlet, and in the process, the cooling liquid flows in the liquid-cooled jacket fully through the inner side channel, the labyrinth channel and the outer side channel three-stage circulating structure, so that the effective cooling of a fuel channel is realized, and the cooling efficiency is improved. The diversion protrusions are used for guiding the coal water slurry so as to slow down the impact of the coal water slurry on the coal water slurry channel, and meanwhile, the distribution of the coal water slurry in the coal water slurry channel is more uniform, so that subsequent efficient reaction is facilitated, and meanwhile, the diversion protrusions are more wear-resistant, and the service life of the burner is prolonged.

Drawings

FIG. 1 is a schematic view of a jacket burner assembly for a coal water slurry gasifier according to an embodiment of the application;

FIG. 2 is a longitudinal cross-sectional view of a labyrinth passage in an embodiment of the present application;

FIG. 3 is an axial cross-sectional view of a diverter protrusion according to one embodiment of the present application;

FIG. 4 is a radial cross-sectional view of a diverter protrusion in one embodiment of the application;

FIG. 5 is an axial cross-sectional view of an injection hole in an embodiment of the present application;

FIG. 6 is a longitudinal cross-sectional view of an injection hole in an embodiment of the present application;

FIG. 7 is a schematic view of a liquid cooling jacket installed in a water wall according to an embodiment of the present application.

Reference numerals and signs

1-Fuel channel, 10-internal oxygen channel, 100-oxygen cyclone, 101-internal oxygen inlet, 11-coal water slurry channel, 110-coal water slurry inlet, 111-split protrusion, 112-coal slurry cyclone, 12-external oxygen channel, 120-jet hole, 121-external oxygen inlet;

2-liquid cooling jackets, 20-partition plates, 21-labyrinth passages, 210-annular space, 211-communication ports, 22-inner passages, 23-outer passages, 24-cooling liquid inlets and 25-cooling liquid outlets;

3-water cooling walls.

Detailed Description

Specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

It is to be readily understood that, according to the technical solutions of the present invention, those skilled in the art may replace various structural modes and implementation modes with each other without changing the true spirit of the present invention. Accordingly, the following detailed description and drawings are merely illustrative of the invention and are not intended to be exhaustive or to limit the invention to the precise form disclosed.

Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms.

The application provides a jacket burner assembly for a coal water slurry gasifier, which comprises the following components: a fuel passage 1 and a liquid cooling jacket 2.

Referring to fig. 1, the fuel channel 1 includes an inner oxygen channel 10, a coal water slurry channel 11 surrounding the inner oxygen channel 10, and an outer oxygen channel 12 surrounding the coal water slurry channel 11. In the embodiment of the application, the inner oxygen channel 10, the coal water slurry channel 11 and the outer oxygen channel 12 are coaxially arranged, the inner oxygen channel 10 is used for conveying oxygen, the inner oxygen inlet 101 of the inner oxygen channel 10 is arranged at the top of the inner oxygen channel 10, the coal water slurry channel 11 is used for conveying coal water slurry, the outer oxygen channel 12 is used for conveying oxygen, the outer oxygen inlet 121 is arranged on the side wall of the outer oxygen channel 12, and the outlet of the inner oxygen channel 10 and the outlet of the coal water slurry channel 11 adopt the same inclination angle to incline to define the burner head of the conical shrinkage, as shown in fig. 1.

In the coal water slurry feeding process route, coal water slurry and oxygen are used as main raw material media, and are conveyed into a fuel channel 1 arranged on a gasification furnace through a process pipeline, mixed in a burner and subjected to combustion reaction in a burner head area in the gasification furnace to generate crude synthesis gas.

The outer wall of the coal water slurry channel 11 is provided with a coal water slurry inlet 110, the inner wall of the coal water slurry channel 11 faces the coal water slurry inlet 110, and a diversion protrusion 111 is arranged on the inner wall of the coal water slurry channel 11 and protrudes out of the inner wall of the coal water slurry channel 11. The central axis of the coal water slurry inlet 110 is perpendicular to the central axis of the coal water slurry channel 11, as shown in fig. 1,3 to 4.

The liquid cooling jacket 2 is annularly arranged on the outer side of the outer oxygen channel 12, a partition plate 20 and a labyrinth channel 21 are arranged in the liquid cooling jacket 2, the partition plate 20 divides the liquid cooling jacket 2 into an inner channel 22 and an outer channel 23 which are relatively independent, the labyrinth channel 21 is annularly arranged on the outer side of an outlet of the outer oxygen channel 12, a cooling liquid inlet 24 is formed in the inner channel 22, a cooling liquid outlet 25 is formed in the outer channel 23, a liquid inlet of the labyrinth channel 21 is communicated with the inner channel 22, and a liquid outlet of the labyrinth channel 21 is communicated with the outer channel 23.

The liquid cooling jacket 2 is located at the outermost side of the fuel channel 1 and is used for introducing cooling liquid (water) to protect the burner, the outer wall of the liquid cooling jacket 2 is cylindrical, a labyrinth channel 21 is arranged at the part, located at the outer side of the outer oxygen channel 12, of the liquid cooling jacket 2, and the labyrinth channel 21 is used for fully circulating and flowing the cooling liquid.

According to the jacket burner assembly for the coal water slurry gasification furnace, the liquid cooling jacket 2 comprises the inner side channel 22, the labyrinth channel 21 and the outer side channel 23, cooling liquid flows from the inner side channel 22 to the inner layer of the labyrinth channel 21, passes through the labyrinth channel 21, enters the outer side channel 23 from the outer side of the labyrinth channel 21 and flows out through the cooling liquid outlet 25, and in the process, the cooling liquid passes through the three-stage circulation structures of the inner side channel 22, the labyrinth channel 21 and the outer side channel 23 so as to fully flow in the liquid cooling jacket 2, thereby realizing effective cooling of the fuel channel 1 and improving cooling efficiency. The diversion protrusion 111 is used for guiding the water-coal-slurry so as to slow down the impact of the water-coal-slurry on the water-coal-slurry channel 11, and meanwhile, the water-coal-slurry is distributed more uniformly in the water-coal-slurry channel 11 so as to facilitate subsequent efficient reaction, and meanwhile, the diversion protrusion 111 is more wear-resistant, thereby being beneficial to prolonging the service life of the burner.

As an alternative embodiment, at least three layers of annular spaces 210 are disposed in the labyrinth passage 21, among any adjacent annular spaces 210 in the labyrinth, an outer annular space 210 is disposed around an inner annular space 210 and is in communication with the inner annular space 210, an innermost annular space 210 is disposed around an outer side of an outlet of the outer oxygen passage 12 directly, the liquid inlet is disposed on the innermost annular space 210, and the liquid outlet is disposed on the outermost annular space 210. As shown in fig. 2, the embodiment of the present application can make the cooling liquid diffuse from the innermost annular space 210 to the outermost annular space 210 sequentially until the cooling liquid flows into the outer channel 23 after diffusing into the outermost annular space 210, the labyrinth channel 21 prolongs the movement path of the cooling liquid in the labyrinth channel 21, and the cooling liquid exchanges heat fully in the labyrinth channel 21, so as to increase the cooling effect at the outlet of the external oxygen channel 12. The communication ports 211 between the annular spaces 210 are staggered along the circumferential direction, as shown in fig. 2, so as to further prolong the movement path of the cooling liquid and improve the cooling effect of the cooling liquid.

As an alternative embodiment, the outlet of the external oxygen passage 12 is provided with a conical injection hole 120, and the partition 20 is cylindrical. As shown in fig. 1, 5 to 6, the inner wall and the outer wall of the liquid cooling jacket 2 are both cylindrical, and a cylindrical partition 20 is provided between the inner wall and the outer wall of the liquid cooling jacket 2 to define an annular outer channel 23 and an annular inner channel 22. The cylindrical partition 20 and the conical spray hole 120 define a larger cooling fluid flowing space therebetween, so that the spray hole 120 can be effectively cooled, the rising amount of hot gas is reduced, and the burner is better protected. The conical spray hole 120 in the embodiment of the application can further increase the injection speed of oxygen, and the inclination angle of the spray hole 120 can be consistent with that of the burner nozzle so as to maintain the space consistency between the spray hole 120 and the burner nozzle.

As an alternative embodiment, the inner wall of the injection hole 120 is provided with injection holes along the circumferential direction. The jet holes arranged in the embodiment of the application are used for accelerating oxygen, so that the oxygen speed reaches 80-90 m/s, and the gasification efficiency is improved. As a preferable mode of setting the spray holes, 30 holes with the diameter of 6mm are formed on the inner wall of the spray hole 120, and the outer ring oxygen can be accelerated to 90m/s.

As an alternative embodiment, the partition 20 is directly connected to the top wall of the outermost annular space 210 in the labyrinth passage 21. Embodiments of the present application provide a larger space for the coolant to circulate through the inner side channel 22 to increase the cooling effect on the inner side of the outer oxygen channel 12.

As an alternative embodiment, a guide member extending spirally in the axial direction is provided in the outer channel 23. The helically extending baffle may direct the cooling fluid to flow helically within the outer channel 23 to extend the flow path of the cooling fluid within the outer channel 23 to achieve a sufficient flow of cooling fluid. The flow guide in the embodiment of the present application may be a spiral plate defining an axially extending spiral channel within the outer channel 23.

As an alternative embodiment, an oxygen cyclone 100 is disposed in the internal oxygen passage 10. The oxygen cyclone 100 is used for premixing the delivered oxygen and delivering the oxygen downwards to the burner head in a high-speed spiral flow mode for combustion. Preferably, the oxygen swirler 100 is positioned close to the burner head to better achieve the turbulent effect of oxygen at the burner head. The oxygen swirler 100 includes a plurality of spiral vanes uniformly distributed along the circumference of the inner oxygen passage 10 to accelerate the axially output oxygen to the burner head in a spiral flow.

As an alternative embodiment, the coal water slurry channel 11 is provided with a coal slurry cyclone 112. The coal slurry cyclone 112 forms a spiral channel in the coal water slurry channel 11 for accelerating and dispersing the coal water slurry. The coal slurry cyclone 112 comprises a plurality of spiral vanes uniformly distributed along the ring shape of the coal water slurry channel 11 so as to accelerate the axially output coal water slurry to the burner head in a spiral flow mode.

As an alternative embodiment, the surface of the diverting protrusion 111 facing the coal water slurry inlet 110 includes a tapered drainage surface, and the apex of the drainage surface is located on the central axis of the coal water slurry inlet 110 and extends in a direction approaching the coal water slurry inlet 110. The drainage surface in the embodiment of the application is conical, so that the drainage surface can further drain the coal water slurry entering the coal water slurry channel 11, and meanwhile, the impact on the inner wall of the coal water slurry channel 11 is reduced, and the coal water slurry channel 11 is protected.

The application also provides a water-cooled wall gasifier, which comprises a furnace body and the jacket burner assembly for the water-coal-slurry gasifier, wherein the furnace body comprises a water-cooled wall 3, a containing cavity is arranged on the water-cooled wall 3, at least part of the liquid-cooled jacket 2 is arranged in the containing cavity, and the pressure in the liquid-cooled jacket 2 is larger than the pressure in the furnace body.

As shown in fig. 1 and 7, in the embodiment of the application, the water-cooling wall 3 is arranged at the outer side of the liquid-cooling jacket 2, a water-cooling channel is arranged in the water-cooling wall 3or a water-cooling coil is arranged on the wall surface of the water-cooling wall 3, the temperature of the water-cooling wall 3 is controlled to be about 300 ℃ ± 50 ℃ through water-cooling heat exchange, the leakage of synthesis gas caused by the connection of a water-cooling wall gasification furnace and the liquid-cooling jacket 2 or the occurrence of cracks at the liquid-cooling jacket 2 due to the over-high temperature of the connection position is avoided, and the stable and relatively low working environment is favorable for prolonging the service life and reliability of the burner.

In the embodiment of the application, the internal pressure of the water-cooled wall gasifier is controlled within the range of 6.5MPa-8MPa, the pressure in the liquid-cooled jacket 2 is set within the range of 7.5MPa-10MPa, and the pressure in the liquid-cooled jacket 2 is kept to be larger than the pressure in the fuel channel 1 when the pressure is selected. The pressure in the liquid cooling jacket 2 is larger than the pressure in the water cooling wall gasifier, so that the synthesis gas in the water cooling wall gasifier does not overflow when the liquid cooling jacket 2 leaks.

The liquid cooling jacket 2 in the embodiment of the application is connected with the water cooling wall 3 through a flange, and the structure such as a sealing gasket is arranged at the connecting part to realize effective sealing.

By adopting the water-cooled wall gasification furnace provided by the embodiment of the application, 2000t of daily-treated water-coal-slurry is treated, the pressure in the water-cooled wall gasification furnace is 7.5MPa during stable gasification, the pressure in the liquid cooling jacket 2 is 9MPa, the reliability of the water-cooled wall gasification furnace is ensured by the pressure difference of the two, and once the liquid cooling jacket 2 leaks, the synthesis gas in the furnace cannot leak outwards.

The above technical schemes can be combined according to the need to achieve the best technical effect.

The foregoing is only illustrative of the principles and preferred embodiments of the present invention. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the invention and should also be considered as the scope of protection of the present invention.

Claims (10)

1. A jacket burner assembly for a coal water slurry gasifier, comprising:

The fuel channel comprises an internal oxygen channel, a coal water slurry channel annularly arranged at the outer side of the internal oxygen channel and an external oxygen channel annularly arranged at the outer side of the coal water slurry channel;

the outer wall of the coal water slurry channel is provided with a coal water slurry inlet, the inner wall of the coal water slurry channel is provided with a diversion protrusion towards the position of the coal water slurry inlet, and the diversion protrusion protrudes out of the inner wall of the coal water slurry channel;

The liquid cooling jacket is arranged at the outer side of the outer oxygen channel, a partition plate and a labyrinth channel are arranged in the liquid cooling jacket, the partition plate divides the liquid cooling jacket into an inner channel and an outer channel which are relatively independent, the labyrinth channel is arranged at the outer side of an outlet of the outer oxygen channel in a surrounding mode, a cooling liquid inlet is formed in the inner channel, a cooling liquid outlet is formed in the outer channel, a liquid inlet of the labyrinth channel is communicated with the inner channel, and a liquid outlet of the labyrinth channel is communicated with the outer channel.

2. The jacket burner assembly for a coal water slurry gasifier according to claim 1, wherein at least three layers of annular spaces are arranged in the labyrinth passage, and in any adjacent annular spaces, an outer annular space is annularly arranged outside an inner annular space and is communicated with the inner annular space, an innermost annular space is directly annularly arranged outside an outlet of the outer oxygen passage, the liquid inlet is formed in the innermost annular space, and the liquid outlet is formed in the outermost annular space.

3. The jacket burner assembly for a coal water slurry gasifier according to claim 2, wherein a conical spray hole is provided at an outlet of the external oxygen channel, and the partition plate is cylindrical.

4. The jacket burner assembly for a coal water slurry gasifier according to claim 3, wherein the inner wall of the injection hole is provided with injection holes along the circumferential direction.

5. The jacketed burner assembly for a coal water slurry gasifier as set forth in claim 4, wherein the partition is directly connected to a top wall of the annular space located at the outermost layer in the labyrinth passage.

6. The jacket burner assembly for a coal water slurry gasifier according to any of claims 1 to 5, wherein a guide member extending spirally in an axial direction is provided in the outer passage.

7. The jacket burner assembly for a coal water slurry gasifier according to any of claims 1 to 5, wherein an oxygen cyclone is provided in the inner oxygen passage.

8. The jacket burner assembly for a coal water slurry gasifier according to any one of claims 1 to 5, wherein a coal slurry cyclone is provided in the coal water slurry channel.

9. The jacket burner assembly for a coal water slurry gasification furnace according to any one of claims 1 to 5, wherein a surface of the diverting protrusion facing the coal water slurry inlet comprises a tapered drainage surface, and an apex of the drainage surface is located on a central axis of the coal water slurry inlet and extends in a direction approaching the coal water slurry inlet.

10. A water-cooled wall gasifier, characterized by comprising a furnace body and the jacket burner assembly for the water-coal-slurry gasifier according to any one of claims 1-9, wherein the furnace body comprises a water-cooled wall, a containing cavity is arranged on the water-cooled wall, at least part of the liquid-cooled jacket is arranged in the containing cavity, and the pressure in the liquid-cooled jacket is larger than the pressure in the furnace body.