JP2013006964A - Gasified gas generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent condensation of steam within an extraction pipe for extracting a flowing medium from a gasification furnace to reduce the clogging of the flowing medium in the extraction pipe by designing the installation position of the extraction pipe.SOLUTION: The gasified gas generating device 100 includes: a gasification furnace 130 for generating gasified gas by gasifying a gasifying raw material with the heat of the flowing medium made into fluid bed; a steam storage portion 150 disposed vertically below the gasification furnace to store steam; a plurality of communicating portions 160 allowing the gasification furnace to communicate with the steam storage portion to introduce the steam stored in the steam storage portion into the gasification furnace; and the extraction pipe 170 having a bellows structure in at least part of the side surface thereof, the extraction pipe being extended from the gasification furnace vertically downward through the steam storage portion to circulate the flowing medium in the gasification furnace.

Description

  The present invention relates to a gasification gas generation apparatus provided with a gasification furnace using a fluidized medium.

  2. Description of the Related Art In recent years, a technology has been developed that gasifies solid raw materials such as coal, biomass, and tire chips to generate gasified gas instead of petroleum. The gasified gas generated in this way can be used for efficient power generation systems such as Integrated Coal Gasification Combined Cycle (IGCC), hydrogen production, synthetic fuel (synthetic petroleum) production, chemical fertilizer ( (Urea) and other chemical products. Among solid raw materials used as raw materials for gasification gas, coal, in particular, has a recoverable period of about 150 years, more than three times the recoverable period of oil, and reserves are unevenly distributed compared to oil. Therefore, it is expected as a natural resource that can be stably supplied over a long period of time.

  Conventionally, the gasification process of coal has been performed by partial oxidation using oxygen or air. However, since it is necessary to perform partial oxidation at a high temperature of 2000 ° C., there is a disadvantage that the cost of the gasification furnace increases. Had.

  Then, the technique (steam gasification) which gasifies coal at about 700 to 900 degreeC using water vapor | steam in the gasification furnace in which the fluidized medium forms the fluidized bed is developed (for example, Patent Document 1). In this steam gasification technology, it is possible to reduce the plant and operating costs by setting the temperature low.

Patent No. 3933105

  In the technology for performing steam gasification in a fluidized bed as described above, when performing maintenance in the gasification furnace, it is necessary to extract the fluidized medium from the gasification furnace. In such an operation, the fluidized medium is extracted from the gasification furnace through an extraction pipe provided in the gasification furnace. Conventionally, an extraction pipe for extracting a fluid medium from a gasification furnace is formed to extend in the horizontal direction from the side surface of the gasification furnace toward the outside of the gasification furnace. That is, the extraction tube was arranged at room temperature (for example, about 25 ° C.).

  Therefore, during the operation of the gasifier, although the temperature in the gasifier is as high as about 700 ° C. to 900 ° C., the temperature of the extraction pipe is normal, so that the water vapor introduced into the gasifier is extracted. When led into the outlet pipe, the water vapor is condensed into water in the outlet pipe. If it does so, a fluid medium will adhere in an extraction pipe with this condensed water, and will block an extraction pipe.

  Also, even when the operation of the gasification furnace is stopped to maintain the inside of the gasification furnace, since the condensed water remains in the extraction pipe during operation, the fluid medium adheres in the extraction pipe, The extraction tube remains obstructed.

  If the extraction tube is blocked in this way, the fluid medium cannot be extracted smoothly from the extraction tube. For this reason, during operation and maintenance, workers need to perform maintenance work such as hammering the extraction pipe or scraping out the fluid medium from the extraction pipe using a separate device. It was supposed to force complicated work.

  A configuration is also possible in which a heater or the like is wound around the extraction pipe to evaporate the water in the extraction pipe. However, a separate heater must be prepared, which consumes the power consumption of the heater or installs the heater itself. It was costly because of it.

  Therefore, the present invention can prevent condensation of water vapor in the extraction pipe by devising the installation position of the extraction pipe for extracting the fluid medium from the gasification furnace, and block the fluid medium in the extraction pipe. It aims at providing the gasification gas production | generation apparatus which can be suppressed.

  In order to solve the above problems, a gasification gas generator of the present invention includes a gasification furnace that generates gasification gas by gasifying a gasification raw material with heat of a fluidized fluidized medium, and a gasification furnace A plurality of communicating portions that are disposed vertically below, communicate with the water vapor storage portion that stores water vapor, the gasification furnace and the water vapor storage portion, and introduce the water vapor stored in the water vapor storage portion into the gasification furnace; A pipe having a bellows structure in at least a part of the pipe, and an extraction pipe that extends vertically downward from the gasification furnace, penetrates the water vapor storage section, and allows the fluid medium in the gasification furnace to circulate. , Provided.

  You may provide the water vapor injection part which injects water vapor | steam toward a water vapor | steam storage part while injecting water vapor | steam toward the outer peripheral surface of an extraction pipe.

  You may provide the fin standingly arranged on the outer peripheral surface of an extraction pipe, and conducting external heat to the inside of an extraction pipe.

  According to the present invention, it is possible to prevent condensation of water vapor in the extraction pipe by devising the installation position of the extraction pipe for extracting the fluid medium from the gasification furnace, and blockage of the fluid medium in the extraction pipe Can be suppressed.

It is explanatory drawing for demonstrating the specific structure of the gasification gas production | generation apparatus concerning embodiment. It is explanatory drawing for demonstrating the specific structure of the vicinity of a gasification furnace and a water vapor storage part. It is the III-III sectional view taken on the line in FIG. It is explanatory drawing for demonstrating the structure which provided the screw feeder in the extraction pipe | tube.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Gasified gas generator 100)
FIG. 1 is an explanatory diagram for explaining a specific configuration of a gasification gas generation apparatus 100 according to the present embodiment. Here, a two-column fluidized bed gasification furnace will be described as the gasification gas generator 100. The gasified gas generation apparatus 100 gasifies a solid material such as coal using water vapor in a gasification furnace 130 in which a fluidized bed is formed by a fluidized medium, and generates a gasified gas.

  An object of the present embodiment is to provide a gasified gas generation apparatus 100 that can easily extract a fluid medium from the gasification furnace 130. Here, in order to grasp the purpose of the mechanism for extracting the fluidized medium from the gasifier 130, the overall configuration for generating the gasified gas will be described, and then the mechanism for extracting the fluidized medium from the gasifier 130 will be described. The detailed configuration will be described in detail.

  As shown in FIG. 1, the gasified gas generator 100 includes a combustion furnace 110, a medium separator 120, a gasifier 130, a heat retaining unit 140, a water vapor storage unit 150, a communication unit 160, and an extraction pipe. 170 and the water vapor injection part 180 are comprised.

  In the gasification gas generator 100, as a whole, a fluid medium composed of sand such as dredged sand (silica sand) having a particle size of about 300 μm is circulated as a heat medium. Focusing on the flow of the fluidized medium, first, the high-temperature fluidized medium heated to about 1000 ° C. in the combustion furnace 110 is introduced into the medium separator 120 together with the combustion exhaust gas. Separated into exhaust gas. The combustion exhaust gas separated by the medium separator 120 is heat recovered by a boiler (not shown) or the like. Further, the high-temperature fluid medium separated by the medium separator 120 is introduced into the gasification furnace 130, and in the gasification furnace 130, a fluidized bed is formed by steam introduced from a steam storage unit 150 described later.

  The gasification furnace 130 generates gasification gas by gasifying the gasification raw material with the heat of the fluidized medium fluidized by the steam introduced from the steam reservoir 150. More specifically, in the gasification furnace 130, gasified raw materials such as coal such as lignite, petroleum coke (petro coke), biomass, and tire chips are supplied to a fluidized bed formed of a fluidized medium. However, it is gasified at about 700 ° C. to 900 ° C. by the steam and the heat of the fluidized medium to generate gasified gas. Then, the fluid medium that has functioned as a fluidized bed finally returns to the combustion furnace 110. The heat retaining unit 140 suppresses heat radiation from the gasification furnace 130 to the outside.

  The water vapor storage unit 150 is disposed vertically below the gasification furnace 130 and temporarily stores water vapor of about 200 ° C. to 500 ° C. supplied from the water vapor supply source 200. Water vapor is supplied from the water supply source 200 to the water vapor storage unit 150 through a water vapor injection unit 180 described later.

  The communication unit 160 communicates the gasification furnace 130 and the water vapor storage unit 150 and introduces the water vapor stored in the water vapor storage unit 150 into the gasification furnace 130.

  FIG. 2 is an explanatory diagram for explaining a specific configuration in the vicinity of the gasification furnace 130 and the water vapor storage unit 150. As shown in FIG. 2, a plurality of communication parts 160 are provided, and the bottom part of the gasification furnace 130 and the top part of the water vapor storage part 150 communicate with each other. Here, the bottom portion includes not only the bottom surface 130a of the gasification furnace 130 but also a surface 130b erected on the bottom surface 130a and a surface 130c orthogonal to the surface 130b. It includes not only the top surface 150a but also a surface 150b erected on the top surface 150a and a surface 150c orthogonal to the surface 150b. As shown in FIG. 2, in this embodiment, the communication unit 160 communicates a surface 150 b that forms the top of the water vapor storage unit 150 and a surface 130 b that forms the bottom of the gasification furnace 130.

  More specifically, the communication part 160 is inclined vertically downward from the surface 150b constituting the top of the water vapor storage part 150 to the surface 130b constituting the bottom of the gasification furnace 130, and is connected to the surface 150b and the surface. Communicate with 130b. Accordingly, it is possible to efficiently form a fluidized bed of the fluidized medium in the gasification furnace 130 and to suppress the fluidized medium from dropping from the gasification furnace 130 to the water vapor storage unit 150. In addition, the diameter of the communication part 160 is about 3 mm, for example.

  In this way, the fluidized medium is fluidized in the gasification furnace 130, and the gasified raw material is gasified by the heat of the fluidized fluidized medium and the water vapor introduced from the water vapor reservoir 150.

(Mechanism for extracting fluid medium)
Next, an extraction pipe 170 that can easily extract the fluid medium from the gasification furnace 130 during maintenance or operation will be described. In the present embodiment, it is possible to prevent a situation where water vapor is condensed in the extraction pipe 170 by devising the installation position of the extraction pipe 170.

(Extraction pipe 170)
Referring to FIG. 2, the extraction pipe 170 is configured by a pipe that extends vertically downward from the gasification furnace 130 (Y-axis direction in FIG. 2) and penetrates the water vapor storage unit 150. It is formed to be able to distribute the fluid medium inside. Here, the extraction pipe 170 may be extended substantially vertically downward from the gasification furnace 130, and may be extended at a certain angle from the vertical downward direction. For example, when attempting to extract the fluid medium from the gasification furnace 130 to the outside, the valve 172 provided in the extraction pipe 170 is shifted from the closed state to the open state. Then, the fluid medium passes through the extraction pipe 170 from the gasification furnace 130 and is discharged to the outside.

  Here, during the operation of the gasification gas generator 100, the temperature of the water vapor in the water vapor storage unit 150 in which the extraction pipe 170 is installed is about 200 ° C to 500 ° C. That is, by installing the extraction pipe 170 in the water vapor storage section 150, the extraction pipe 170 is continuously heated by the water vapor in the water vapor storage section 150, and the temperature inside the extraction pipe 170 is reduced. It can be maintained above the condensation point of water (dew point or 100 ° C.). Therefore, condensation of water vapor inside the extraction pipe 170 can be suppressed during operation of the gasified gas generation apparatus 100.

  Note that when the entire gasified gas generation apparatus 100 is stopped during maintenance or the like, since the supply of water vapor from the water vapor supply source 200 is also stopped, water vapor does not enter the extraction pipe 170. Therefore, even if the gasification gas production | generation apparatus 100 stops and the temperature in the water vapor storage part 150 falls, water vapor | steam does not condense inside the extraction pipe | tube 170. FIG.

  That is, according to the gasified gas generation apparatus 100 according to the present embodiment, the condensation of water vapor inside the extraction pipe 170 is performed regardless of whether the gasification gas generation apparatus 100 is in operation or is stopped. Therefore, it is possible to avoid a situation in which the fluid medium adheres in the extraction pipe 170 and closes the extraction pipe 170.

  Further, the extraction pipe 170 has a bellows structure 170a on a part of its side surface. As described above, the water vapor storage unit 150 in which the extraction pipe 170 is disposed is at a high temperature of about 200 ° C. to 500 ° C. during the operation of the gasification gas generator 100, so that the extraction pipe 170 is heated by this heat. There is a risk of expanding and extending in the vertical direction (Y-axis direction in FIG. 2) (hot extension occurs).

  On the other hand, when the gasified gas generation device 100 is stopped, the supply of water vapor from the water vapor supply source 200 to the water vapor storage unit 150 is stopped, and thus the temperature in the water vapor storage unit 150 is lowered. At this time, as the temperature in the water vapor storage unit 150 decreases, the extraction pipe 170 that has become high temperature is cooled. If it does so, there exists a possibility that the extraction pipe 170 may shrink | contract in the perpendicular direction (Y-axis direction in FIG. 2).

  If hot extension occurs in the extraction pipe 170 or the extraction pipe 170 contracts, pressure is applied to the bottom of the gasification furnace 130, the top of the steam storage section 150, or the bottom section 150d of the steam storage section 150. There is also a possibility that the gasification furnace 130 and the water vapor storage unit 150 may be bent or damaged.

  Therefore, the structure in which the extraction pipe 170 has the bellows structure 170a on at least a part of the side surface thereof allows the bellows structure 170a to absorb the thermal extension and contraction of the extraction pipe 170 in the vertical direction. It is possible to suppress the pressure on the bottom of the water vapor, the top of the water vapor storage unit 150, or the bottom surface part 150d of the water vapor storage unit 150. Therefore, it is possible to avoid a situation in which the gasification furnace 130 or the water vapor storage unit 150 is bent or damaged.

  3 is a cross-sectional view taken along line III-III in FIG. As shown in FIG. 3, five extraction pipes 170 are provided in the gasified gas generation apparatus 100.

  The water vapor injection unit 180 injects water vapor supplied from the water vapor supply source 200 toward the outer peripheral surface of the extraction pipe 170 and introduces water vapor into the water vapor storage unit 150. Thus, with the configuration including the water vapor injection unit 180, the high temperature water vapor supplied from the water vapor supply source 200 can be directly collided with the outer peripheral surface of the extraction pipe 170. Therefore, the heat of the water vapor supplied from the water vapor supply source 200 can be directly conducted to the inside of the extraction pipe 170.

  However, since it is difficult to cause all the water vapor ejected by the water vapor injection unit 180 to collide with the extraction pipe 170, it cannot be said that the heat conduction efficiency to the extraction pipe 170 is sufficient. Therefore, in this embodiment, as shown in FIG. 3, fins 190 are provided on the outer peripheral surface of the extraction pipe 170 so as to stand on the outer peripheral surface of the extraction pipe 170.

  By providing the fins 190 on the outer peripheral surface of the extraction pipe 170, the contact area with the water vapor injected by the water vapor injection unit 180 can be increased, and the heat of the water vapor can be efficiently conducted to the inside of the extraction pipe 170. Is possible. Thereby, it is possible to further suppress the water vapor from condensing inside the extraction pipe 170 during the operation of the gasified gas generation apparatus 100.

  Further, as indicated by broken line arrows in FIG. 3, the water vapor injected from the water vapor injection unit 180 collides with the outer peripheral surface of the extraction pipe 170 and the fins 190 and is introduced into the gasifier 130.

  Therefore, the water vapor injected from the water vapor injection unit 180 is convected in the water vapor storage unit 150, the water vapor in the water vapor storage unit 150 is evenly mixed, and the temperature of the water vapor in the water vapor storage unit 150 is made uniform. Can do. Thereby, water vapor having a uniform temperature can be introduced into the gasification furnace 130, and the gasification reaction in the gasification furnace 130 can be stably performed.

  As described above, according to the gasified gas generation device 100 according to the present embodiment, the extraction pipe 170 that extracts the fluid medium from the gasification furnace 130 is installed in the water vapor storage unit 150 to extract the fluid. Condensation of water vapor in the pipe 170 can be suppressed, and blockage of the fluid medium in the extraction pipe 170 can be prevented. As a result, it is possible to smoothly extract the fluid medium from the gasification furnace 130 without forcing the operator to perform complicated work even when the gasification furnace 130 is stopped or in operation.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, in the above-described embodiment, the gasified gas generation apparatus 100 has been described with a configuration including a plurality (five) of the extraction pipes 170. However, the gas storage unit 150 is extended vertically downward from the gasification furnace 130. As long as it is possible to penetrate and flow the fluid medium in the gasification furnace 130, there may be one or more. Moreover, the installation position in the horizontal surface (XZ plane in FIG. 3) of the extraction pipe 170 is not limited.

  Furthermore, in the above-described embodiment, the extraction pipe 170 extending vertically downward from the gasification furnace 130 and penetrating the water vapor storage unit 150 has been described. Therefore, the fluid medium in the gasification furnace 130 is extracted by its own weight. The pipe 170 will be distributed. However, as shown in FIGS. 4A and 4B, when there is a portion extending from the gasification furnace 130 in the horizontal direction (X-axis direction in FIG. 4) in the extraction pipe 170, the extraction pipe 170. A screw feeder 250 that moves the fluid medium in the gasification furnace 130 to the outside by rotating the spiral blade 250a may be provided. Thereby, it is possible to surely scrape out the fluid medium in the extraction pipe 170. In addition, as shown in FIG.4 (c), the screw feeder 250 can also be provided in the extraction pipe | tube 170 extended | stretched perpendicularly downward from the gasification furnace 130 mentioned above and penetrated the water vapor | steam storage part 150. FIG.

  The present invention relates to a gasification gas generation apparatus provided with a gasification furnace using a fluidized medium.

DESCRIPTION OF SYMBOLS 100 ... Gasification gas production | generation apparatus 130 ... Gasification furnace 150 ... Steam storage part 160 ... Communication part 170 ... Extraction pipe 170a ... Bellows structure 180 ... Steam injection part 190 ... Fin

Claims (3)

A gasification furnace for generating a gasification gas by gasifying a gasification raw material with heat of the fluidized fluidized medium;
A water vapor storage part that is arranged vertically below the gasification furnace and stores water vapor;
A plurality of communication portions for communicating the gasification furnace and the water vapor storage section, and introducing the water vapor stored in the water vapor storage section into the gasification furnace;
A pipe having a bellows structure on at least a part of a side surface, which extends vertically downward from the gasification furnace, penetrates the water vapor storage section, and can flow the fluid medium in the gasification furnace Extraction tube,
A gasified gas generating apparatus comprising:   The gasified gas generation device according to claim 1, further comprising a water vapor injection unit that injects water vapor toward the outer peripheral surface of the extraction pipe and introduces water vapor into the water vapor storage unit.   The gasified gas generator according to claim 1 or 2, further comprising a fin that stands on the outer peripheral surface of the extraction pipe and conducts external heat to the inside of the extraction pipe.

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