JPH0742356U - Adjustable tip clearance burner for coal gasifier - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a variable tip clearance burner for a coal gasification furnace, which does not use a rapidly deteriorating packing and prevents the coal slurry and the outside gas from leaking for a long period of time. An inner gas supply pipe (2) having a conical taper (3) at its tip and displaced in the axial direction, and a coal slurry which surrounds the outer side of the inner gas supply pipe (2) and has a conical taper (6) at its tip and is displaced in the axial direction A supply pipe 5, an outer gas supply pipe 8 that surrounds the outside of the coal slurry supply pipe 5 and has a conical taper 9 at the tip, an outer periphery of the inner gas supply pipe 2 and a base end of the coal slurry supply pipe 5. Expansion joint 1 to seal the space
6 and an expansion joint 25 that seals between the outer periphery of the coal slurry supply pipe 5 and the base end of the outer gas supply pipe 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a variable tip clearance burner for a coal gasification furnace, which blows coal slurry and gas into a coal gasification furnace that gasifies coal.

[0002]

[Prior art]

 As an example of a conventionally used tip clearance variable burner for a coal gasification furnace, a burner disclosed in JP-A-58-213089 is known.

This variable tip clearance burner for a coal gasification furnace is provided with an inner gas supply pipe for supplying oxygen or air and a coal surrounding the outer side of the inner gas supply pipe for supplying coal slurry. It is provided with a slurry supply pipe and an outer gas supply pipe surrounding the outside of the coal slurry supply pipe for supplying oxygen or air for temperature control.

The tips of these three supply pipes all have a conical taper so that the inner gas, the coal slurry, and the outer gas are blown into the coal gasification furnace. The amount of coal slurry blown from the coal slurry supply pipe into the coal gasification furnace must be adjusted to suit the load of power generation, etc., and the outside gas must be adjusted according to changes in the amount of coal slurry blown. It is necessary to control the temperature by adjusting the amount of air blown into.

Therefore, the inner gas supply pipe and the coal slurry supply pipe are displaced in the axial direction so that the gap between the conical taper at the tip of the inner gas supply pipe and the tip of the coal slurry supply pipe, and the coal slurry supply pipe and the outer gas The gap between the conical taper at the tip of the supply pipe can be adjusted so that the burner can be turned down.

In order to prevent the coal slurry and the outer gas from leaking from between the respective supply pipes even when the inner gas supply pipe and the coal slurry supply pipe are displaced in the axial direction as described above, the outer periphery of the inner gas supply pipe is And a base end of the coal slurry supply pipe, and between the outer periphery of the coal slurry supply pipe and the base end of the outer gas supply pipe, packing is interposed and a gas purge structure is further provided.

[0007]

[Problems to be solved by the device]

 The coal slurry supplied to the variable tip clearance burner for the coal gasification furnace has a high pressure, and the heat of the coal gasification furnace is transmitted to the burner and the temperature of each supply pipe becomes high. There was a risk of leakage of coal slurry and outside gas.

An object of the present invention is to provide a variable tip clearance burner for a coal gasifier, which does not use a rapidly deteriorating packing and prevents the coal slurry and the outside gas from leaking over a long period of time. is there.

[0009]

[Means for Solving the Problems]

 The tip clearance variable burner for a coal gasification furnace of the present invention has an inner gas supply pipe which has a conical taper at the tip and is displaced in the axial direction, an outer side of the inner gas supply pipe, and a conical taper at the tip. A coal slurry supply pipe that has an axial displacement, an outer gas supply pipe that surrounds the outside of the coal slurry supply pipe and has a conical taper at the tip, an outer periphery of the inner gas supply pipe and a base of the coal slurry supply pipe. An expansion joint that seals between the ends and an expansion joint that seals between the outer periphery of the coal slurry supply pipe and the base end of the outer gas supply pipe are provided.

[0010]

[Action]

 Expansion joints are resistant to pressure and high temperature, so coal slurry and outside gas do not leak for a long period of time.

[0011]

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1. 1 is a coal gasification furnace, 2 is an inner gas supply pipe, and the tip of the inner gas supply pipe 2 has a conical taper 3. It is a nozzle, and a connecting pipe 4 is attached near the base end of the inner gas supply pipe 2 so that an inner gas such as oxygen or air passes through the connecting pipe 4 and the inner gas supply pipe 2 to produce coal gas. It is designed to be blown into the furnace 1.

A coal slurry supply pipe 5 that concentrically surrounds the outside of the inner gas supply pipe 2 is provided, and the tip of the coal slurry supply pipe 5 is a nozzle having a conical taper 6. A connecting pipe 7 is attached near the base end of the coal gasifier, and the coal slurry passes from the connecting pipe 7 between the outside of the inner gas supply pipe 2 and the coal slurry supply pipe 5 into the coal gasification furnace 1. It is blown in and is gasified by combustion.

An outer gas supply pipe 8 that concentrically surrounds the outside of the coal slurry supply pipe 5 is further provided, and the tip of the outer gas supply pipe 8 is a nozzle having a conical taper 9. A connection pipe 10 is attached near the base end of the supply pipe 8, and an outside gas for temperature control such as oxygen or air is supplied from the connection pipe 10 to the outside of the coal slurry supply pipe 5 and the outside gas supply pipe 8. It is designed to be blown into the coal gasification furnace 1 through the space. Inside the coal gasification furnace 1, there is provided a cooling pipe 11 that surrounds the outer gas supply pipe 8, and this cooling pipe 11 is connected to a cooling passage 12 in a conical taper 9 of the outer gas supply pipe 8. ing. A coolant such as water or steam passes through the cooling pipe 11 and the cooling passage 12.

A flange 13 is tightly fixed to the outer circumference of the inner gas supply pipe 2 slightly below the connecting pipe 4. Further, a flange 14 is also tightly fixed to the outer periphery of the base end of the coal slurry supply pipe 5, and another flange 15 is tightly fixed to the upper surface of this flange 14, and the center of the flange 15 is attached to the inner gas supply pipe. 2 slidably penetrates through. Between the lower surface of the flange 13 and the upper surface of the flange 15, a bellows-shaped expansion joint 16 surrounding the outer circumference of the inner gas supply pipe 2 is tightly attached, and the expansion joint 16 allows the inner gas supply pipe The outer periphery of 2 and the base end of the coal slurry supply pipe 5 are hermetically sealed. An upper end of a guide rod 17 is fixed to the flange 13, and a lower portion of the guide rod 17 slidably penetrates the flanges 15 and 14.

A tooth-shaped member 19 meshing with the worm 18 is fixed to the upper surface of the flange 13, and the worm 18 is rotated by a motor 20. When the motor 20 is driven by the control of the controller 21 and the worm 18 is rotated, the tooth profile member 19 moves up and down along the worm 18, and the inner gas supply pipe 2 is axially displaced via the flange 13. At this time, the inner gas supply pipe 2 slides with respect to the flange 15 and the guide rod 17 slides with respect to the flanges 15 and 14, and the bellows-shaped expansion joint 16 forms the outer periphery of the inner gas supply pipe 2 and the coal. The slurry supply pipe 5 expands and contracts while maintaining a tight seal with the base end. When the inner gas supply pipe 2 is displaced in the axial direction, the tip clearance between the conical tapers 3 and 6 changes, and the amount of coal slurry injected into the coal gasifier 1 is adjusted.

Similarly, a flange 22 is closely fixed to the outer circumference of the coal slurry supply pipe 5 slightly below the connecting pipe 7, and a flange 23 is also tightly fixed to the outer circumference of the base end of the outer gas supply pipe 8. Another flange 24 is closely fixed to the upper surface of the flange 23, and the coal slurry supply pipe 5 slidably penetrates through the center of the flange 24. A bellows-shaped expansion joint 25 surrounding the outer periphery of the coal slurry supply pipe 5 is tightly attached between the lower surface of the flange 22 and the upper surface of the flange 24. A seal is provided between the outer periphery and the base end of the outer gas supply pipe 8. An upper end of a guide rod 26 is fixed to the flange 22, and a lower portion of the guide rod 26 slidably penetrates the flanges 24 and 23.

A toothed member 28 meshing with the worm 27 is fixed to the upper surface of the flange 22, and the worm 27 is rotated by a motor 29. When the motor 29 is driven by the control of the controller 21 and the worm 27 is rotated, the tooth profile member 28 moves up and down along the worm 27, and the coal slurry supply pipe 5 is axially displaced via the flange 22. At this time, the coal slurry supply pipe 5 slides with respect to the flange 24, the guide rod 26 slides with respect to the flanges 24 and 23, and the bellows-shaped expansion joint 25 is connected to the outer periphery of the coal slurry supply pipe 5 and the outside. It expands and contracts while maintaining a tight seal with the base end of the side gas supply pipe 8. When the coal slurry supply pipe 5 is displaced in the axial direction, the tip clearance between the conical tapers 6 and 9 changes, and the amount of outer gas blown into the coal gasifier 1 is adjusted.

Spacers 30 and 31 are attached to the outer peripheries of the inner gas supply pipe 2 and the coal slurry supply pipe 5 near the tips to prevent the inner gas supply pipe 2 and the coal slurry supply pipe 5 from being offset at the front end side. ing. In addition, minimum stoppers 32 and 33 are attached to the inner surfaces near the tips of the coal slurry supply pipe 5 and the outer gas supply pipe 8 and the spacers 30 and 31 are brought into contact with each other, so that the inner gas supply pipe 2 and the coal slurry supply pipe 5 are lowered. Is regulated so that the tip clearance between the conical tapers 3, 6 and 9 is not completely closed.

[0019]

[Effect of device]

 The present invention relates to a chip clearance variable burner for a coal gasification furnace, in which the outer circumference of the inner gas supply pipe and the base end of the coal slurry supply pipe are connected to each other, and Since each is sealed with expansion joints, there is no leakage of coal slurry and outside gas as in the case of using conventional packing, and it can be safely used for a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

[Explanation of symbols]

 1 coal gasifier 2 inner gas supply pipe 3 conical taper 5 coal slurry supply pipe 6 conical taper 8 outer gas supply pipe 9 conical taper 16,25 expansion joint

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Seitaro Tsujimoto 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toyosu General Office

Claims (1)

[Scope of utility model registration request] 1. An inner gas supply pipe which has a conical taper at its tip and is displaced in the axial direction, and a coal slurry supply pipe which surrounds the outside of the inner gas supply pipe and has a conical taper at its tip and is displaced in the axial direction. An outer gas supply pipe that surrounds the outside of the coal slurry supply pipe and has a conical taper at the tip, and an expansion joint that seals between the outer periphery of the inner gas supply pipe and the base end of the coal slurry supply pipe, A variable tip clearance burner for a coal gasification furnace, comprising: an expansion joint that seals between an outer periphery of the coal slurry supply pipe and a base end of the outer gas supply pipe.