JP2012148209A - Oil-water separator, and apparatus for refining gasified gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the temperature of an oil-water separator itself higher than the melting point of heavy tar even if not using a different heating device.SOLUTION: The oil-water separator 250 includes a reservoir 252 to hold oil-mixed water, a feed pipe 258 which feeds the oil-mixed water to the reservoir through a feed port 258a arranged in the middle of the top of the reservoir, a treated water recovery port 266 which is arranged at the upper edge of the reservoir and through which the treated water separated from the oil-mixed water runs, a sedimented oil recovery port 268 which is arranged at the bottom of the reservoir and below the feed pipe and through which the oil separated from the oil-mixed water and sedimented at the bottom of the reservoir runs, and a reservoir outer circumference 270 surrounding the reservoir and the outer circumference of the reservoir from its top to bottom, and provided with a treated water passage 272 through which the treated water passed through the treated water recovery port runs.

Description

  The present invention relates to an oil-water separation device and a gasification gas purification device for purifying water used for removing particles such as tar contained in a gasification gas.

  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. In order to solve this problem, a technology for gasifying coal at about 700 ° C. to 900 ° C. using water vapor has been developed. In this technique, it is possible to reduce the cost by setting the temperature low, but the generated gasification gas is compared with a gasification gas generated by partial oxidation at a high temperature of 2000 ° C. A lot of tar will be included. At this time, if the temperature of the gasification gas decreases in the process using the gasification gas, the tar contained in the gasification gas condenses, causing problems such as blockage of piping, failure of equipment used in the process, poisoning of the catalyst, etc. Will occur.

  Then, the technique of removing particles, such as tar contained in gasification gas, by spraying liquids, such as water, to gasification gas produced | generated with the gasification furnace is disclosed (for example, patent document 1). And the tar mixed water (oil mixed water) obtained by spraying water on gasification gas is stored in the oil-water separator (for example, patent document 2) which isolate | separates a substance by the difference in specific gravity (density), and oil water Waste water is purified by separating water and tar in a separation device.

JP 2009-40862 A Japanese Patent Laid-Open No. 10-235105

  In the oil-water separator as described in Patent Document 2 described above, tar having a specific gravity greater than that of water (hereinafter referred to as heavy tar) moves to the lower part of the oil-water separator and settles below the oil-water separator. It is recovered from the oil recovery port.

  However, since heavy tar has a high melting point, it tends to coagulate, and there is a possibility that the precipitated oil recovery port may be blocked. Therefore, a heating device such as a steam trace and a heater is prepared separately, and the oil / water separator itself that becomes the sedimentation path of the heavy tar is heated from the outside so that the temperature in the oil / water separator is higher than the melting point of the heavy tar. It was necessary to keep.

  In view of such problems, the present invention provides an oil / water separator for purifying water used for removing particles such as tar contained in a gasification gas without using a separate heating device. An object of the present invention is to provide an oil-water separation device and a gasification gas purification device capable of maintaining the temperature of itself higher than the melting point of heavy tar.

  In order to solve the above-described problems, an oil / water separator according to the present invention is an oil / water separator that separates substances according to a difference in specific gravity, and is provided in the center of a reservoir that stores oil-mixed water and an upper portion of the reservoir. A supply pipe for supplying the oil-mixed water to the reservoir through the supply port, a treated-water recovery port provided at the upper edge of the reservoir, through which treated water separated from the oil-mixed water passes, and a lower portion of the reservoir And a settling oil recovery port provided below the supply pipe and through which the oil separated from the oil-mixed water and settled at the bottom of the storage section passes, a storage section, and a storage outer peripheral section that surrounds the outer periphery from the upper end to the lower end of the storage section And a treated water passage for distributing treated water that has passed through the treated water recovery port.

  The horizontal cross-sectional area of the reservoir may be gradually reduced from the upper end to the lower end of the reservoir.

  In order to solve the above problems, the gasification gas purification apparatus of the present invention is a gasification gas purification apparatus that purifies an unpurified gas by removing at least oil, and a storage unit that stores oil-mixed water; A supply pipe that supplies oil-mixed water to the reservoir through a supply port provided in the center of the upper portion of the reservoir, and a treatment that is provided at the upper edge of the reservoir and through which treated water separated from the oil-mixed water passes From the water recovery port, the lower part of the reservoir and below the supply pipe, the sedimented oil recovery port through which the oil separated from the oil-mixed water and settled in the lower part of the reservoir passes, the reservoir, and the upper end of the reservoir An oil / water separator having a treated water passage for circulating treated water that has passed through the treated water recovery port, and a treated water that has passed through the treated water passage of the oil / water separator. Spray unrefined gas on refined gas and oil Characterized in that it comprises a spray tower to produce a slip water.

  In the present invention, the temperature of the oil / water separator itself can be maintained at a temperature higher than the melting point of the heavy tar without using a separate heating device.

It is explanatory drawing for demonstrating a gasification gas purification system. It is explanatory drawing for demonstrating the specific structure of a gasification gas refinement | purification apparatus. It is explanatory drawing for demonstrating the specific structure of an oil-water separator. It is explanatory drawing for demonstrating the external appearance of an oil-water separator. It is explanatory drawing for demonstrating the flow of the treated water in an oil-water separator.

  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.

(Gasification gas purification system 100)
FIG. 1 is an explanatory diagram for explaining a gasification gas purification system 100 according to the present embodiment. As shown in FIG. 1, the gasification gas purification system 100 includes a gasification gas generation device 110 and a gasification gas purification device 200.

  The gasification gas generator 110 is, for example, a two-column fluidized bed gasification furnace, and circulates a fluid medium composed of sand such as dredged sand (silica sand) as a heat medium. As shown in FIG. 1, the gasification gas generator 110 includes a combustion furnace 112, a medium separator 114, a gasification furnace 116, and a reforming furnace (oxidation reforming furnace) 118. Gasification is performed to generate gasified gas.

  Focusing on the flow of sand as a fluidized medium, the high-temperature sand heated to about 1000 ° C. in the combustion furnace 112 is introduced into the medium separation device 114 together with the combustion exhaust gas, and in the medium separation device 114, the high-temperature sand and the combustion exhaust gas are introduced. Separated. The hot sand separated by the medium separator 114 is introduced into the gasification furnace 116 and finally returns to the combustion furnace 112. Further, the combustion exhaust gas separated by the medium separator 114 is heat recovered by a boiler or the like.

  The gasification furnace 116 gasifies a solid raw material such as coal such as lignite, petroleum coke (Petro coke), biomass, tire chips, or a liquid raw material such as black liquor at 700 ° C to 900 ° C for gasification. Generate gas. In the present embodiment, by supplying water vapor to the gasification furnace 116, the gasification raw material is gasified to generate gasified gas (water vapor gasification).

  Here, a circulating fluidized bed type gasification furnace 116 will be described as an example. However, if the gasification raw material is a gasification furnace that gasifies a gasification raw material, a simple fluidized bed type gasification furnace, or sand is used as its own weight. It may be a moving bed type gasification furnace that forms a moving bed by flowing down vertically.

  The reforming furnace 118 adds oxygen or air to the gasification gas generated in the gasification furnace 116 to be about 900 to 1500 ° C., and reforms (oxidation reforming) the tar contained in the gasification gas. Since the gasification gas reformed in the reforming furnace 118 contains tar (oil), solid particles other than tar (sludge), water vapor, and the like, the gasification gas is sent to the downstream gasification gas purification apparatus 200. Purified.

(Gasification gas purification device 200)
FIG. 2 is an explanatory diagram for explaining a specific configuration of the gasification gas purification apparatus 200. As shown in FIG. 2, the gasification gas purification apparatus 200 includes a heat exchanger 210, a spray tower 212, a mist separator 214, an oil / water separator (tar decanter) 250, a buffer tank 216, and a first tar tank 218. The second tar tank 220, the first pump 230a, the second pump 230b, the third pump 230c, and the fourth pump 230d are configured.

  The heat exchanger 210 performs heat exchange between the gasified gas (unrefined gas) X1 introduced from the gasified gas generator 110 and the water vapor, that is, recovers the sensible heat of the gasified gas X1 with water vapor. The outlet temperature of the conversion gas X1 is set to 300 ° C to 600 ° C.

  The spray tower 212 cools the gasification gas X1 which has become 300 to 600 ° C. to about 70 ° C. by spraying the cooling water Y 1 of about 40 ° C. onto the gasification gas X 1 to be processed. Thereby, tar and sludge contained in the gasification gas X1 are condensed and removed from the gasification gas X1, and purified gas X2 and oil mixed water Z1 are generated. Then, the spray tower 212 supplies the purified gas X2 to the downstream mist separator 214 and sends the oil mixed water Z1 (about 70 ° C.) composed of water, tar and sludge to the oil / water separator 250.

  The mist separator 214 sprays the purified water X2 with cooling water Y2 (about 40 ° C.) that is finer water droplets than the cooling water Y1. Thereby, in the spray tower 212, the mist-like tar, sludge, etc. contained in the purified gas X2 that could not be sufficiently separated and removed are condensed and removed from the purified gas X2, and the purified gas X3 (purified gasification gas) Oil mixed water Z2 is produced. The mist separator 214 supplies the purified gas X3 to a downstream booster (not shown), and sends oil mixed water Z2 (about 70 ° C.) composed of water, tar, and sludge to the oil / water separator 250. .

  The oil / water separation device 250 separates tar and sludge contained in the oil mixed water Z1 sent from the spray tower 212 and the oil mixed water Z2 sent from the mist separator 214 from the water based on the difference in specific gravity. In the present embodiment, the oil / water separator 250 is a heavy tar T1 having a specific gravity greater than that of water, for example, a tricyclic aromatic compound such as anthracene or phenanthrene, an anthracene oil containing a tricyclic aromatic compound, a carborub oil, a washing oil, or a pitch. Is settled at the bottom of the oil / water separator 250. The oil / water separator 250 also separates light tar T2 such as benzene, toluene, xylene, cresol, and other aromatics, bicyclic aromatics such as naphthalene, and naphthalene oils containing these aromatics. Float on top of device 250. Then, the oil / water separator 250 sends treated water Y3, which is water from which the heavy tar T1 and the light tar T2 are separated and removed, from the oil / water separator 250 to the buffer tank 216.

  The buffer tank 216 stores the treated water Y3 separated from the oil mixed water Z1 and Z2 in the oil / water separator 250. The buffer tank 216 supplies the cooling water Y1 to the spray tower 212 through the first pump 230a, and supplies the cooling water Y2 to the mist separator 214 through the second pump 230b. The cooling waters Y1 and Y2 are sequentially supplied from the buffer tank 216 to the spray tower 212 and the mist separator 214, but the capacity of the cooling waters Y1 and Y2 is smaller than the treated water Y3 supplied from the oil / water separator 250. In the buffer tank 216, the treated water Y3 is surplus. Therefore, the surplus treated water Y3 is discharged from the buffer tank 216 to a device that performs anaerobic treatment, aerobic treatment, aeration treatment, and the like, and drainage treatment is performed.

  The first tar tank 218 stores the heavy tar T1 supplied from the lower part of the oil / water separator 250 through the third pump 230c.

  The second tar tank 220 stores the light tar T2 supplied from the upper part of the oil / water separator 250 through the fourth pump 230d.

  The first pump 230a is provided in the middle of a pipe connecting the spray tank 212 for spraying the cooling water Y1 and the buffer tank 216 in the spray tower 212, pumps the treated water Y3 from the buffer tank 216, and cools the treated water Y3. Water Y1 is supplied to the spray section of the spray tower 212.

  The second pump 230b is provided in the middle of the pipe connecting the spray tank for spraying the cooling water Y2 in the mist separator 214 and the buffer tank 216, pumps the treated water Y3 from the buffer tank 216, and cools the treated water Y3. Water Y2 is supplied to the spray section of the mist separator 214.

  The third pump 230 c is provided in the middle of a pipe connecting the lower part of the oil / water separator 250 and the first tar tank 218, and pumps out the heavy tar T 1 that has settled in the lower part of the oil / water separator 250, so that the first tar tank 218. To supply.

  The fourth pump 230d pumps the light tar T2 that has floated above the oil-water separator 250 and supplies it to the second tar tank 220.

  Thus, according to the gasification gas purification apparatus 200 concerning this embodiment, the oil mixed water Z1 and Z2 produced | generated with the spray tower 212 and the mist separator 214 are heavy tar T1 and light tar with the oil-water separator 250. Separated into T2 and treated water Y3. Hereinafter, the oil-water separator 250 according to the present embodiment will be described.

(Oil-water separator 250)
FIG. 3 is an explanatory diagram for explaining a specific configuration of the oil / water separator 250, and FIG. 4 is an explanatory diagram for explaining an appearance of the oil / water separator 250. As shown in FIG. 3, the oil / water separator 250 includes a reservoir 252, a supply pipe 258, a center well 260, a recovery baffle 262, a floating oil recovery port 264, a treated water recovery port 266, and a precipitated oil recovery A mouth 268, a storage outer peripheral portion 270, and a treated water passage 272 are included. As described above, the oil / water separator 250 separates the heavy tar T1 and the light tar T2 from the oil mixed water Z1 and Z2 depending on the specific gravity, and supplies the obtained treated water Y3 to the buffer tank 216.

  The storage unit 252 includes an upper storage unit 254 and a lower storage unit 256, and stores oil mixed water Z1 and Z2.

  As shown in FIG. 4, the upper reservoir 254 has a cylindrical shape extending in the vertical direction. In the installed state of the oil / water separator 250, the upper end is open, and the lower reservoir 256 is connected to the lower end. Yes. In the present embodiment, the draft surface (indicated by the alternate long and short dash line in FIG. 3) in the oil / water separator 250 is the upper end of the upper reservoir 254.

  As shown in FIG. 4, the lower reservoir 256 has a substantially conical shape, and in the installed state of the oil / water separator 250, the horizontal cross-sectional area gradually decreases from the upper end to the lower end of the lower reservoir 256. Is formed. In the lower reservoir 256, heavy tar T1 and sludge having a specific gravity greater than that of water separated in a region R described later accumulates. A pipe for supplying the heavy tar T <b> 1 to the first tar tank 218 is connected to the lower end of the lower reservoir 256. In addition, the angle of repose θ of the lower reservoir 256 is set to, for example, 45 ° so that the heavy tar T1 and sludge are easily discharged.

  The supply pipe 258 supplies oil mixed water Z1 and Z2 (about 70 ° C.) to the storage unit 252 through a supply port 258a provided at the center (or near the center) of the upper storage unit 254. The supply port 258a may be provided at any position in the upper reservoir 254 as long as the oil mixed water Z1 and Z2 can be supplied to the reservoir 252.

  The center well 260 has a cylindrical shape extending in the vertical direction concentric with the upper reservoir 254 and the supply pipe 258, and the diameter of the horizontal cross section of the center well 260 is shorter than the diameter of the horizontal cross section of the upper reservoir 254. It is formed longer than the diameter of the horizontal cross section of the tube 258. As shown in FIG. 3, the lower end of the center well 260 is formed longer than the supply port 258a by a predetermined length vertically downward.

  The recovery baffle 262 has a cylindrical shape that extends concentrically with the upper reservoir 254, the supply pipe 258, and the center well 260, and the horizontal cross-section diameter of the recovery baffle 262 is the diameter of the horizontal cross-section of the upper reservoir 254. It is shorter and longer than the diameter of the horizontal cross section of the center well 260. As shown in FIG. 3, the lower end of the collection baffle 262 is formed shorter than the lower end of the center well 260 by a predetermined length in the vertically upward direction.

  A disc-shaped region R below the center well 260 and having an outer periphery directly below the lower end of the collection baffle 262 collects tar and sludge contained in the oil mixed water Z1 and Z2 by changing the flow from the vertical direction to the horizontal direction. It is an area that is separated based on the specific gravity of each substance while reaching just below the baffle 262.

  The floating oil recovery port 264 is formed between the outer peripheral portion of the center well 260 and the inner peripheral portion of the recovery baffle 262, and the light tar T2 having a specific gravity smaller than the water separated in the region R passes therethrough. A piping for supplying light tar T2 to the second tar tank 220 is connected to the floating oil recovery port 264. The light tar T2 that has passed through the floating oil recovery port 264 is pumped up by the fourth pump 230d and stored in the second tar tank 220.

  The treated water recovery port 266 is formed between the upper edge of the upper reservoir 254 and the outer periphery of the recovered baffle 262, through which the treated water Y3 separated from the oil mixed water Z1 and Z2 passes. That is, the treated water Y3 separated in the region R of the reservoir 252 overflows from the upper edge (upper end) of the upper reservoir 254, passes through the treated water recovery port 266, and flows into the treated water passage 272 described later. To do.

  The settled oil recovery port 268 is provided below the lower reservoir 256 and below the supply pipe 258, and is separated from the oil mixed water Z1 and Z2, and oil (heavy tar T1) that has settled below the lower reservoir 256 pass. A pipe for supplying the heavy tar T <b> 1 to the first tar tank 218 is connected to the precipitated oil recovery port 268. The heavy tar T1 that has passed through the precipitated oil recovery port 268 is pumped out by the third pump 230c and stored in the first tar tank 218.

  The storage outer peripheral portion 270 is a member that surrounds the outer periphery from the upper end to the lower end of the storage portion 252. In addition, the upper end of the storage outer peripheral portion 270 is formed longer than the upper end of the upper storage portion 254 by a predetermined length in the vertically upward direction.

  The treated water passage 272 is formed by the outer peripheral portion of the storage portion 252 and the inner peripheral portion of the stored outer peripheral portion 270, and distributes the treated water Y3 that has passed through the treated water recovery port 266. A pipe for supplying the treated water Y3 to the buffer tank 216 is connected to the treated water passage 272. The treated water Y3 that has passed through the treated water passage 272 is stored in the buffer tank 216 and supplied to the spray tower 212 and the mist separator 214.

  FIG. 5 is an explanatory diagram for explaining the flow of the treated water Y3 in the oil / water separator 250. As shown in FIG. 5, the oil mixed water Z1 and Z2 supplied from the supply pipe 258 is divided into a heavy tar T1, a light tar T2, and a treated water Y3 in the region R. The treated water Y3 passes through the treated water collection port 266, overflows the upper edge of the upper reservoir 254, and flows into the treated water passage 272. Then, the treated water Y3 flows through the treated water passage 272 from the upper end of the outer periphery of the upper reservoir 254 to the lower end of the outer periphery of the lower reservoir 256.

  Conventionally, since the storage outer peripheral portion 270 does not exist in the oil / water separator, the heat of the oil-mixed water is radiated from the outer peripheral portion of the storage portion to the outside. Therefore, in the separation process in which the oil-mixed water is stored in the storage part and separated into heavy tar, light tar, and treated water, the temperature of the storage part gradually decreases, and the heavy tar is removed from the oil-water separator. While sinking to the bottom, the temperature was lower than the melting point of the heavy tar. As a result, the heavy tar coagulates, and there is a possibility that the precipitated oil recovery port is blocked.

  Therefore, as shown in FIG. 5, the oil / water separation device 250 according to the present embodiment uses the oil mixture water Z1 and Z2 supplied from the supply pipe 258 to the heavy tar T1 and the light light depending on the difference in specific gravity in the storage unit 252. The treated water Y3 is divided into tar T2 and treated water Y3, and the separated treated water Y3 is passed through the treated water passage 272 provided between the storage outer peripheral part 270 and the storage part 252 via the treated water recovery port 266. Then, the treated water Y3 at about 70 ° C. flows evenly around the outer periphery of the storage unit 252, and thus heat can be input from the treated water Y3 to the storage unit 252.

  Thereby, the whole storage part 252 can be kept warm with the treated water Y3, and the temperature of the heavy tar T1 settled in the lower part of the storage part 252 can be maintained higher than the melting point. Accordingly, an increase in the viscosity of the heavy tar T1 caused by a decrease in the temperature of the heavy tar T1 can be suppressed, and the precipitated oil recovery port 268 is blocked without providing a separate heating device. It becomes possible to avoid the situation.

  Further, as described above, the lower storage portion 256 in the present embodiment is formed so that the horizontal cross-sectional area gradually decreases from the upper end to the lower end of the lower storage portion 256 itself. Accordingly, the flow rate of the treated water passing through the treated water passage 272 can be increased from the upper part to the lower part of the oil / water separator 250, and the high-temperature treated water Y3 immediately after passing through the treated water recovery port 266 is immediately removed. It becomes possible to reach the lower part of the oil-water separator 250 (that is, the outer periphery of the lower part of the lower reservoir 256). Therefore, the heavy tar T1 deposited in the lower part of the storage part 252 (the lower part of the lower storage part 256) can be heated with a high rate.

  Furthermore, with the configuration including the treated water passage 272, the treated water Y3 flows directly through the outer periphery of the storage unit 252, and the heat of the treated water Y3 is directly transmitted to the storage unit 252. Therefore, the temperature of the treated water Y3 immediately after passing the treated water passage 272 is reduced to about 50 ° C. Then, the temperature of the treated water Y3 that passes through the treated water passage 272 and is stored in the buffer tank 216 is further reduced to about 40 ° C.

  The treated water Y3 stored in the buffer tank 216 becomes the cooling water Y1 and Y2 supplied to the spray tower 212 and the mist separator 214, but the oil / water separator does not have a storage outer peripheral portion 270. The treated water separated from the mixed water was stored in the buffer tank as it was, and the temperature of the treated water stored in the buffer tank was as high as about 60 ° C. Therefore, the treated water stored in the buffer tank cannot be used as cooling water as it is, and it is necessary to provide a cooling device such as a heat exchanger at the subsequent stage of the buffer tank.

  As described above, according to the oil / water separator 250 in the present embodiment, the temperature of the treated water Y3 that has passed through the treated water passage 272 is reduced to about 50 ° C. For this reason, the temperature of the treated water Y3 is cooled to about 40 ° C. when stored in the buffer tank 216. Therefore, by employing the oil / water separator 250 according to the present embodiment, it is not necessary to install a separate cooling device after the buffer tank 216 in the gasification gas purification device 200, or a cooling device is provided. However, the load can be reduced.

  As described above, according to the oil / water separator 250 according to the present embodiment, heat treatment between the high-temperature treated water Y3 and the heavy tar T1 in the reservoir 252 does not use a separate heating device. In both cases, the temperature of the storage unit 252 itself can be maintained at a temperature higher than the melting point of the heavy tar T1, and the temperature of the treated water Y3 can be set to the spray tower 212 or the mist separator 214 without using a separate cooling device. The cooling water can be lowered to a temperature that can be used as the cooling water Y1 and Y2.

  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 embodiment described above, the floating oil recovery port 264 is provided in the oil / water separator 250 and the light tar T2 is stored in the second tar tank 220, but the recovery baffle 262 and the floating oil recovery port 264 are not provided. The light tar T2 may be circulated through the treated water passage 272 together with the treated water Y3.

  INDUSTRIAL APPLICATION This invention can be utilized for the oil-water separation apparatus and gasification gas refinement | purification apparatus which refine | purify the water used in order to remove particles, such as tar contained in gasification gas.

200 ... Gasification gas purification device 212 ... Spray tower 214 ... Mist separator 250 ... Oil / water separator 252 ... Storage unit 254 ... Upper storage unit 256 ... Lower storage unit 258 ... Supply pipe 258a ... Supply port 266 ... Treated water recovery port 268 ... Precipitated oil recovery port 270 ... Storage outer peripheral part 272 ... Treated water passage

Claims (3)

An oil-water separator that separates substances according to the difference in specific gravity,
A reservoir for storing oil-mixed water;
A supply pipe for supplying oil-mixed water to the reservoir through a supply port provided in the center of the upper portion of the reservoir;
A treated water recovery port provided at the upper edge of the reservoir and through which treated water separated from the oil-mixed water passes;
A settling oil recovery port provided below the reservoir and below the supply pipe, through which oil separated from the oil-mixed water and settled at the bottom of the reservoir passes;
A treated water passage that is formed by the reservoir and a reservoir outer periphery that surrounds the outer periphery from the upper end to the lower end of the reservoir, and circulates the treated water that has passed through the treated water recovery port,
The oil-water separator characterized by comprising.   2. The oil-water separator according to claim 1, wherein the horizontal cross-sectional area of the storage section gradually decreases from the upper end to the lower end of the storage section. A gasification gas refining device for refining unpurified gas by removing at least oil,
A reservoir for storing the oil-mixed water; a supply pipe for supplying the oil-mixed water to the reservoir through a supply port provided at the upper center of the reservoir; and an upper edge of the reservoir. A treated water recovery port through which treated water separated from the oil mixed water passes, and oil provided below the reservoir and below the supply pipe, separated from the oil mixed water and settled below the reservoir Is formed by a sedimented oil recovery port through which the water passes, a storage portion, and a storage outer peripheral portion that surrounds the outer periphery from the upper end to the lower end of the storage portion, and the treated water passage for circulating the treated water that has passed through the treated water recovery port An oil-water separator having a path;
A spray tower that sprays treated water that has passed through the treated water passage of the oil / water separator onto unpurified gas, and generates purified gas and oil mixed water;
A gasification gas purification apparatus comprising:

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