JP5974362B2 - Gas sampling probe - Google Patents

Description

  The present invention relates to a gas sampling probe, and more particularly to a gas sampling probe suitable for sampling gas inside a fluidized bed.

  In recent years, a fluidized bed gasifier using a fluidized bed has been developed as a device that can effectively produce fuel gas for power generation from solid raw materials such as coal and biomass.

  The fluidized bed gasifier produces a product gas by heating the solid raw material with fluidized sand and supplying a gasifying agent such as water vapor to produce the generated gas. Understanding the behavior of changing gas composition, concentration, etc. is important not only for evaluating the performance of fluidized bed gasifiers, but also for knowing the impact on the environment and the materials constituting equipment. is important.

  For this reason, a gas sampling probe that is inserted into the fluidized bed to sample the gas in the fluidized bed has been proposed (see, for example, Patent Documents 1 and 2).

  The gas sampling probe of patent document 1 is comprised with the double pipe | tube which has an opening part, and has comprised the cooling structure which used the double pipe | tube as the water cooling pipe | tube.

  In the gas sampling probe of Patent Document 2, a ceramic double tubular filter and a stainless steel double tubular probe nozzle are fixed together via a screw portion.

JP 2003-106960 A JP 2001-235404 A

  However, the gas sampling probe disclosed in Patent Document 1 is not suitable for gas sampling in a fluidized bed because fluid sand is also taken in simultaneously from the opening. In addition, since the cooling structure is a water-cooled tube, the tar in the fluidized bed is condensed inside the double tube, which may cause the gas sampling probe to be blocked.

  Further, in the gas sampling probe of Patent Document 2, since the ceramic filter and the stainless steel probe nozzle are fixed by the screw portion, stress is generated in the screw portion due to a difference in thermal deformation due to a difference in material. For this reason, there is a possibility that sufficient strength cannot be maintained for sampling the gas in the flowing fluid sand. In addition, since the ceramic filter is not protected by the casing, there is a possibility that the solid matter contained in the jet spouted by the fluidized bed collides with the filter and damages the filter.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a gas sampling probe that can maintain high strength and can effectively sample the gas in the fluidized bed.

The present invention is a gas sampling probe that is inserted into a fluidized bed and performs gas sampling,
A casing one end to the distal end outer surface of the sampling nozzle to have a bottom which is closed at the other end is fixed, forming an elongated shape in the longitudinal direction of the casing so that the fluidized sand can fall penetrate against the peripheral wall of the casing A communicating hole, a ceramic filter housed in the casing and having an opening that is in contact with the abutting portion of one end of the casing to communicate with the sampling port of the sampling nozzle, and between the bottom of the casing and the ceramic filter And a spring means for pressing the opening portion of the ceramic filter against the abutting portion of the casing and biasing it so as to communicate with the sampling port.

  In the gas sampling probe, it is preferable that the contact portion has a taper portion that aligns the ceramic filter by contacting the opening portion of the ceramic filter.

  In the gas sampling probe, it is preferable that the bottom portion of the casing is configured to be detachable from the peripheral wall portion with a screw.

  According to the present invention, since the ceramic filter provided in the casing is pressed against and supported by the contact portion by the spring means, there is no problem that stress is generated in the ceramic filter, and the ceramic filter is covered by the casing. Therefore, it is possible to obtain an excellent effect that the problem that the jet flow spouted by the fluidized bed collides with the ceramic filter can be prevented.

(A) is a vertical side view showing an embodiment of the gas sampling probe of the present invention, and (b) is a side view showing the appearance of the gas sampling probe of (a). It is a schematic side view of the fluidized-bed gasification apparatus which shows the state which performs the gas sampling inside a fluidized bed with the gas sampling probe of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIGS. 1A and 1B show an embodiment of a gas sampling probe of the present invention. This gas sampling probe 100 is formed of a stainless steel material on the outer surface of the tip of a metal sampling nozzle 1 such as a stainless steel material. One end 2 </ b> A of the casing 2 having a predetermined strength held by a metal such as is fixed by a fixing portion 3. The casing 2 has a larger cross-sectional area than the sampling nozzle 1. The sampling nozzle 1 and the fixing portion 3 of the casing 2 may be fixed by a screw 3a as shown in FIG. 1A, or may be fixed integrally by welding.

  The other end 2 </ b> B of the casing 2 is provided with a closed bottom portion 4, and a communication hole 6 is formed in the peripheral wall portion 5 of the casing 2.

  A ceramic filter 7 is accommodated in the casing 2. The ceramic filter 7 has a cylindrical container shape having a bottom surface 7 a, a peripheral surface 7 b, and an opening 8 at one end and having a diameter smaller than the inner diameter of the casing 2. The ceramic filter 7 makes the opening 8 communicate with the sampling port 1a of the sampling nozzle 1 by bringing the opening 8 into contact with a contact portion 9 provided inside the one end 2A of the casing 2. It has become. Since the ceramic filter 7 has a sintered structure, it has fine holes and can be ventilated.

  Between the bottom 4 of the casing 2 and the ceramic filter 7, the opening 8 of the ceramic filter 7 is pressed against the contact portion 9 of the casing 2 so that the opening 8 communicates with the sampling port 1 a. Spring means 10 for biasing is provided. The spring means 10 is preferably a ceramic spring or a metal spring. In the fluidized bed gasifier 15 of FIG. 2, since gasification is performed in a high temperature atmosphere of about 800 to 900 ° C., a ceramic spring or a metal spring that can withstand this temperature and maintain a pressing force is used for the spring means 10. .

  At this time, the bottom portion 4 is detachably attached to the peripheral wall portion 5 with screws 11, and the bottom portion 4 is formed with a recess 12 for positioning and installing the spring means 10. The bottom 4 is preferably made of the same stainless steel as the peripheral wall 5.

  As shown in FIG. 1A, the communication hole 6 corresponds to a range above the bottom surface 7 a of the ceramic filter 7 pressed against the contact portion 9 by the spring means 10 and below the opening 8. Is formed on the peripheral wall 5. As shown in FIG. 1B, the communication hole 6 may be formed in a plurality of elongated shapes in the longitudinal direction of the casing 2 in the circumferential direction. At this time, one end 2A and the other end 2B of the casing 2 are connected to each other. As long as the strength of the connecting portion 13 that is connected maintains a predetermined strength or more, the shape of the communication hole 6 is arbitrary, and it is preferable that the communication hole 6 has a large opening ratio, and in the circumferential direction. It is preferable to form it uniformly.

  The abutting portion 9 of the one end 2A of the casing 2 has a conical shape from the fixed portion 3 side to the peripheral wall portion 5 side so that the ceramic filter 7 can be aligned by the abutting of the opening 8 of the ceramic filter 7. The taper part 14 whose diameter is expanded is formed.

  FIG. 2 is a schematic side view of a fluidized bed gasification apparatus showing a state where gas sampling inside the fluidized bed is performed by the gas sampling probe 100 of the present invention. In FIG. 2, reference numeral 15 denotes a fluidized bed gasifier, and a fluidized sand supply port 17 for supplying heated fluidized sand 16 and a solid such as coal or biomass at the upper and lower intermediate portions on one side of the fluidized bed gasifier 15. A raw material supply port 19 for supplying the raw material 18 is provided, and a fluidized bed 21 formed by fluidizing a gasifying agent 20 such as water vapor is formed below the fluidized bed gasifier 15. The solid material 18 is gasified by heating the fluidized bed 21 with the fluidized sand 16 and the action of the gasifying agent 20, and the generated product gas 22 is taken out from the upper outlet 23. The fluidized sand 16 whose temperature has been lowered by heating the solid raw material 18 is taken out from the overflow pipe 24 provided on the other side of the fluidized bed gasifier 15 and led to the heater, and is heated again. ing.

  As shown in FIG. 2, the gas sampling probe 100 is configured to sample the gas inside the fluidized bed 21 by being inserted into the fluidized bed 21 from above the fluidized bed gasifier 15.

  Next, the operation of the above embodiment will be described.

  As shown in FIG. 1A, the casing 2 having one end 2A fixed to the tip of the sampling nozzle 1 via the fixing portion 3 is detachably attached to the bottom 4 of the other end 2B with a screw 11. By removing the bottom portion 4, the inside of the other end 2 </ b> B of the casing 2 can be opened. Therefore, the bottom part 4 in which the ceramic filter 7 is inserted inside the peripheral wall part 5 of the casing 2 so that the opening part 8 faces the contact part 9 and the spring means 10 is fitted in the concave part 12 is inserted through the screw 11. Then, the ceramic filter 7 is pushed by the spring means 10 and is held in a state where the opening 8 is pressed against the contact portion 9. At this time, since the tapered portion 14 is formed in the contact portion 9, the cylindrical container-shaped ceramic filter 7 is aligned and held at the axial center of the casing 2. Further, the circular opening portion 8 of the ceramic filter 7 receives a force that is contracted inward by the taper portion 14. However, since the circular shape has high strength against a load contracting inward, the ceramic filter 7 is stressed. Does not occur, and is supported by the casing 2 while maintaining good strength.

  The gas sampling probe 100 performs gas sampling inside the fluidized bed 21 by being inserted into the fluidized bed 21 of the fluidized bed gasifier 15 shown in FIG. At this time, the gas sampling probe 100 performs gas sampling by changing the insertion position in the horizontal direction of the fluidized bed gasifier 15 and arbitrarily changing the insertion depth at each insertion position.

  When the gas sampling probe 100 is inserted into the fluidized bed 21, the gas in the fluidized bed 21 is taken into the casing 2 from the communication hole 6 provided in the peripheral wall portion 5 of the casing 2, and then the fine filter of the ceramic filter 7. It is taken into the ceramic filter 7 through the hole and guided to the sampling port 1 a of the sampling nozzle 1. At this time, although the fluid sand 16 enters the casing 2 through the communication hole 6, the fluid sand 16 that has entered immediately falls, and the fluid sand 16 does not accumulate in the casing 2.

  In the fluidized bed 21, a jet V in which the fluidized sand 16 is spouted by the blowing of the gasifying agent 20 is formed, so that the jet V collides with the bottom of the gas sampling probe 100 inserted in the fluidized bed 21. However, since the casing 2 is covered by the bottom portion 4, even if the jet V contains solid matter, it only collides with the bottom portion 4, and the solid matter collides with the ceramic filter 7. The ceramic filter 7 can be safely protected.

  In addition, since the sampling nozzle 1, the casing 2, and the bottom 4 are made of metal, even if the sampling nozzle 1, the casing 2, and the bottom 4 are fixed by screws 3a, 11 and the like, stress is generated in the fixing portion due to the difference in material. There is no problem, and thus the strength of the casing 2 can be kept high.

  The gas sampling probe of the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Sampling nozzle 1a Sampling port 2 Casing 2A One end 2B Other end 4 Bottom part 5 Perimeter wall part 6 Communication hole 7 Ceramic filter 8 Opening part 9 Contact part 10 Spring means 14 Taper part 100 Gas sampling probe

Claims (3)

A gas sampling probe that is inserted into a fluidized bed and performs gas sampling,
A casing one end to the distal end outer surface of the sampling nozzle to have a bottom which is closed at the other end is fixed, forming an elongated shape in the longitudinal direction of the casing so that the fluidized sand can fall penetrate against the peripheral wall of the casing A communicating hole, a ceramic filter housed in the casing and having an opening that is in contact with the abutting portion of one end of the casing to communicate with the sampling port of the sampling nozzle, and between the bottom of the casing and the ceramic filter And a spring means for pressing the opening portion of the ceramic filter against the abutting portion of the casing to urge it so as to communicate with the sampling port.   2. The gas sampling probe according to claim 1, wherein the abutting portion has a tapered portion that aligns the ceramic filter by abutting the opening of the ceramic filter.   The gas sampling probe according to claim 1 or 2, wherein the bottom portion of the casing is configured to be detachable from the peripheral wall portion with a screw.

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