JP2014024937A - System and method for generating gasified gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost required for disposing of used activated sludge.SOLUTION: A system 100 for generating gasified gas includes: a gasification furnace 116; a cleaning and refining section (spray tower 214, mist separator 216, and second heat exchanger 218) for forming a refined gasified gas by cleaning and refining the gasified gas X1 by using water; an activated sludge tank 314 which accommodates waste water Y3, Y4 formed in the cleaning and refining section and activated sludge, and brings the activated sludge into contact with the waste water to incorporate tar contained in the waste water into the activated sludge and to remove the tar from the waste water; a moisture adjusting section 316 for removing water from a mixture Y7 composed of the waste water 9 which is formed in the activated sludge tank 314 and from which the tar is removed and the activated sludge containing the incorporated tar; and a second delivery section 318 for delivering the activated sludge containing the incorporated tar from which the waste water Y9 is removed in the moisture adjusting section 316 to the gasification furnace 116.

Description

  The present invention relates to a gasification gas generation system and a gasification gas generation method for generating a gasification gas by gasifying a gasification raw material.

  In recent years, a technology for generating gasification gas by gasifying gasification raw materials such as coal, biomass, and tire chips instead of petroleum has been developed. The gasified gas thus generated is used for power generation systems, hydrogen production, synthetic fuel (synthetic petroleum) production, chemical fertilizer (urea) and other chemical products. Among gasification raw materials used as raw materials for gasification gas, coal, in particular, has a recoverable period of about 150 years, which is more than three times the extractable period of oil, and reserves are unevenly distributed compared to oil. Therefore, it is expected as a natural resource that can be supplied stably 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 was 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). Further, in the technology of Patent Document 1, wastewater generated by purifying gasification gas is supplied to an activated sludge tank in which activated sludge is accommodated, and tar is incorporated into the activated sludge so that the tar is discharged from the wastewater. A technique for removing the is disclosed.

JP 2011-99071 A

  However, since activated sludge has a large growth rate, the concentration of activated sludge in the activated sludge tank cannot be kept optimal unless the activated sludge is periodically discarded from the activated sludge tank.

  Therefore, it is conceivable that used activated sludge (activated sludge incorporating tar) is dried and then landfilled or incinerated used activated sludge.

  However, in order to dry or incinerate used activated sludge, heat energy is required, and the cost for heat energy increases. It is also necessary to secure a landfill for landfill.

  In view of such a problem, the present invention provides a gasification gas generation system capable of reducing the cost for disposal of used activated sludge by effectively using the used activated sludge, and gasification The object is to provide a gas generation method.

  In order to solve the above problems, a gasification gas generation system of the present invention is a gasification furnace that gasifies a gasification raw material to generate a gasification gas, and the generated gasification gas is cleaned using water, Purifying and producing purified gasification gas, and containing wastewater generated in the cleaning and purification section and activated sludge, and bringing the wastewater and activated sludge into contact with each other, so that the gasification raw material in the wastewater Activated sludge tank that incorporates derived material into activated sludge and removes gasified raw material derived material from wastewater, wastewater from which gasified raw material derived material is removed, and gasified raw material derived material generated in activated sludge tank A moisture adjusting unit that removes water from a mixture that includes activated sludge that has taken in water, and activated sludge that has taken in the material derived from the gasification raw material, from which water has been removed by the moisture adjusting unit, is sent to the gasifier A delivery unit, and And wherein the door.

  The activated sludge tank is equipped with an activated carbon introduction part that introduces activated carbon into the activated sludge tank.In the activated sludge tank, the activated carbon adsorbs the material derived from the gasification raw material in the waste water. Activated charcoal that adsorbs the gasified raw material-derived material is taken in, and the delivery section has activated sludge that has absorbed the gasified raw material-derived material, activated sludge coal that has absorbed the activated carbon adsorbed the gasified raw material-derived material, and the gasified raw material-derived material Activated carbon adsorbed with may be sent to the gasification furnace.

  In the gasification furnace, the fluidized medium forms a fluidized bed, and further includes a combustion furnace that heats the fluidized medium, and the delivery unit takes in the material derived from the gasification raw material into the combustion furnace in addition to the gasification furnace. One or more selected from the group of activated sludge, activated sludge charcoal incorporating activated carbon adsorbed with gasified raw material-derived material, and activated carbon adsorbed with gasified raw material-derived material may be sent out.

  The wastewater is further provided with a sedimentation separation unit that separates the supernatant into a supernatant and sediment according to the difference in specific gravity, the activated sludge tank removes the gasification raw material-derived material from the supernatant, and the delivery unit removes the sediment. It may be delivered to either or both of the gasification furnace and the combustion furnace.

  In order to solve the above-mentioned problems, another gasification gas generation system of the present invention is a gasification furnace in which a fluidized medium forms a fluidized bed, and a gasification raw material is gasified by the fluidized medium to generate a gasified gas. A combustion furnace that heats the fluidized medium, and cleaning and purifying the generated gasification gas using water to produce a purified gasification gas; wastewater generated in the cleaning and purification section; An activated sludge tank that accommodates activated sludge, brings waste gas and activated sludge into contact with each other, incorporates the gasified raw material-derived material in the waste water into the activated sludge, and removes the gasified raw material-derived material from the waste water; A moisture adjustment unit that removes water from a mixture that is generated in the activated sludge tank and that includes the wastewater from which the gasification raw material-derived material has been removed and the activated sludge that has taken in the gasification raw material-derived material, and moisture adjustment. Water is removed by the , Characterized by comprising a sending unit for sending the activated sludge incorporating gasification raw substances derived from the combustion furnace, the.

  The wastewater is further provided with a sedimentation separation unit that separates the supernatant into a supernatant and sediment according to the difference in specific gravity, the activated sludge tank removes the gasification raw material-derived material from the supernatant, and the delivery unit removes the sediment. It may be delivered to either or both of the gasification furnace and the combustion furnace.

  In order to solve the above problems, a gasification gas generation method of the present invention is a gasification gas generation method using a gasification furnace that gasifies a gasification raw material to generate a gasification gas, and uses water. The generated gasified gas is washed and purified to produce purified gasified gas, and the wastewater generated in the process of generating purified gasified gas is brought into contact with activated sludge, so that The gasified raw material-derived material generated in the process of removing the gasified raw material-derived material from the wastewater and the step of removing the gasified raw material-derived material from the wastewater is removed by incorporating the gasified raw material-derived material into the activated sludge. The process of removing water from the mixture comprising the wastewater and the activated sludge incorporating the gasified raw material-derived material, and the activated sludge incorporating the gasified raw material-derived material from which the water has been removed into the gasifier A sending process; Characterized in that it has.

  In order to solve the above-described problems, another gasification gas generation method of the present invention is a gasification furnace in which a fluidized medium forms a fluidized bed, and a gasification raw material is gasified by the fluidized medium to generate a gasified gas. And a combustion furnace that heats the fluidized medium, and a process for generating purified gasification gas by cleaning and purifying the generated gasification gas using water. By contacting the wastewater generated in the process of generating purified gasification gas with activated sludge, the gasified raw material-derived material in the wastewater is taken into the activated sludge and the gasified raw material-derived material is removed from the wastewater. From a mixture comprising a step, waste water from which gasified raw material-derived material is removed, and activated sludge incorporating the gasified raw material-derived material, which is generated in the step of removing the gasified raw material-derived material from the waste water The process of removing water Characterized by having a step of delivering the activated sludge incorporating water gasification raw-derived material removed in the combustion furnace, the.

  In this invention, it becomes possible to aim at reduction of the cost concerning disposal of a used activated sludge by utilizing a used activated sludge effectively.

It is explanatory drawing for demonstrating a gasification gas production | generation system. It is explanatory drawing for demonstrating a gasification gas refinement | purification apparatus and a waste water treatment system. It is a flowchart for demonstrating the flow of a process of the 1st gasification gas production | generation method. It is a flowchart for demonstrating the flow of a process of the 2nd gasification gas production | generation method.

  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 generation system 100)
FIG. 1 is an explanatory diagram for explaining a gasification gas generation system 100. As shown in FIG. 1, the gasification gas generation system 100 includes a gasification gas generation device 110, a gasification gas purification device 200, and a wastewater treatment system 300. In FIG. 1, the flow of gas is indicated by solid arrows, the flow of sand is indicated by dashed-dotted arrows, and the flows of gasification raw materials, solids such as water and oil, and liquids are indicated by broken arrows.

  The gasification gas generation system 100 is a technology that generates gasification gas by gasifying solid raw materials such as coal, biomass, tire chips, etc. instead of oil. In the gasification gas generation system 100, a solid material is gasified at about 700 ° C. to 900 ° C. using water vapor in a gasification furnace in which a fluid medium forms a fluidized bed (steam gasification).

  In this system, it is possible to reduce the cost for temperature rise by setting the temperature low, but the generated gasification gas includes a gasification gas generated by partial oxidation at a high temperature of 2000 ° C. In comparison, a large amount of tar is contained. Therefore, in order to purify the generated gasification gas, the gasification gas purification apparatus 200 is used. Hereinafter, a specific configuration of the gasification gas generation system 100 will be described.

(Gasified gas generator 110)
As shown in FIG. 1, the gasified gas generator 110 includes a combustion furnace 112, a medium separator (cyclone) 114, and a gasifier 116.

  In the gasification gas generator 110, as a whole, a fluid medium composed of sand such as silica sand having a particle size of about 300 μm is circulated as a heat medium. Specifically, the fluid medium is first heated to about 1000 ° C. in the combustion furnace 112 and introduced into the medium separator 114 together with the combustion exhaust gas. In the medium separator 114, the high-temperature fluid medium and the combustion exhaust gas are separated, and the separated high-temperature fluid medium is introduced into the gasification furnace 116. Then, the fluidized medium introduced into the gasification furnace 116 is fluidized into layers by a gasifying agent (steam, nitrogen, air, oxygen, inert gas, etc.) introduced from the bottom of the gasification furnace 116, and then finally Thus, it is returned 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 is, for example, a bubbling fluidized bed (bubbling fluidized bed) gasification furnace, which is a solid material such as coal such as lignite, petroleum coke, biomass, tire chips, or a liquid material such as black liquor. The gasification raw material is gasified at 700 ° C. to 900 ° C. to generate a gasification 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). Since the gasification gas X1 generated in the gasification furnace 116 contains tar (gasification raw material-derived substance), water vapor, and the like, it is sent to the downstream gasification gas purification device 200 and purified.

  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.

(Gasification gas purification device 200)
FIG. 2 is an explanatory diagram for explaining the gasification gas purification device 200 and the waste water treatment system 300. As shown in FIG. 2, the gasification gas purification apparatus 200 includes a reforming furnace (oxidation reforming furnace) 210, a first heat exchanger 212, a spray tower 214, a mist separator 216, and a second heat exchanger 218. And a sedimentation separation unit 220 and a first delivery unit 222. In FIG. 2, the flow of gas is indicated by solid arrows, and the flow of solids and liquids such as gasification raw materials, water, and oil is indicated by broken arrows.

  The reforming furnace 210 adds oxygen or air to the gasification gas X1 generated in the gasification furnace 116 to be about 900 to 1500 ° C. and reforms (oxidation reforming) the tar contained in the gasification gas X1. . The first heat exchanger 212 performs heat exchange between the gasified gas X2 reformed in the reforming furnace 210 and water vapor, that is, recovers the sensible heat of the gasified gas X2 with water vapor, The outlet temperature is set to 300 ° C to 600 ° C.

  The spray tower (cleaning and purification unit) 214 cools the gasification gas X2 that has become 300 ° C to 600 ° C to about 70 ° C by spraying cooling water of about 40 ° C onto the gasification gas X2 to be processed. To do. Thereby, the tar contained in the gasification gas X2 is condensed and removed from the gasification gas X2, and purified gas X3 and oil mixed water Y1 are generated. Then, the spray tower 214 supplies the purified gas X3 to the downstream mist separator 216, and sends the oil mixed water Y1 composed of water and tar to the sedimentation separator 220.

  The mist separator (cleaning and purifying unit) 216 sprays the cooling gas (water temperature of about 40 ° C.) on the purified gas X3 as water droplets smaller than the particle diameter in the spray tower 214. As a result, the spray tower 214 condenses mist-like tar or the like contained in the purified gas X3 that could not be sufficiently separated and removed, and is removed from the purified gas X3, thereby generating the purified gas X4 and the oil mixed water Y2. . The mist separator 216 then supplies the purified gas X4 to the downstream second heat exchanger 218, and sends the oil mixed water Y2 composed of water and tar to the sedimentation separator 220.

  The second heat exchanger 218 (washing and purification unit) further cools the purified gas X4 to 30 ° C. or lower using seawater, brine, or the like. Thereby, the remaining tar is further condensed and removed from the purified gas X4, and purified gas X5 (purified gasification gas) is generated. The waste water Y3 used in the second heat exchanger 218 is sent to the waste water treatment system 300 described later.

  The sedimentation separation unit 220 is configured so that the oil mixture water Y1 (drainage) sent from the spray tower 214 and the oil mixture water Y2 (drainage) sent from the mist separator 216 are separated from the supernatant Y4 and the sediment by the difference in specific gravity. Separated with Y5. The supernatant Y4 separated by the sedimentation separator 220 is sent to the wastewater treatment system 300.

  The first delivery unit 222 is configured by a pump or the like, and delivers the sediment Y5 sedimented and separated by the sedimentation separation unit 220 to the combustion furnace 112 of the gasified gas generation device 110.

  Since the sediment Y5 contains a large amount of tar, the first delivery part 222 sends the sediment Y5 to the combustion furnace 112, so that the tar derived from the gasification raw material is used as fuel to burn in the combustion furnace 112. Can be made. Therefore, the sediment Y5 sedimented and separated in the sedimentation separation unit 220 can be effectively used without being discarded, and the cost required for disposal can be reduced. Further, since the amount of fuel used in the combustion furnace 112 can be reduced, the cost required for the fuel can also be reduced.

  The waste water Y3 used in the second heat exchanger 218 of the gasification gas purification apparatus 200 and the supernatant Y4 separated by the sedimentation separation unit 220 contain a large amount of organic matter and ammoniacal nitrogen. Therefore, in order to discharge the wastewater Y3 and the supernatant Y4 to public water such as rivers and sewers, it is necessary to reduce organic matter and ammonia nitrogen to the discharge standard value. Therefore, the wastewater treatment system 300 is used to reduce organic matter and ammonia nitrogen to the discharge standard value from the wastewater Y3 and the supernatant Y4.

(Wastewater treatment system 300)
As shown in FIG. 2, the waste water treatment system 300 includes an ammonia removal unit 310, an activated carbon introduction unit 312, an activated sludge tank 314, a moisture adjustment unit 316, and a second delivery unit 318. .

  The ammonia removing unit 310 is composed of an ammonia stripping device (ammonia diffusion tower), and removes ammonia from the waste water Y3 and the supernatant Y4 by bringing water vapor into countercurrent contact. The waste water Y6 generated in the ammonia removing unit 310 is sent to the activated sludge tank 314.

  The activated carbon introduction unit 312 introduces the activated carbon C into the activated sludge tank 314. By introducing the activated carbon C into the activated sludge tank 314, the tar contained in the waste water Y6 accommodated in the activated sludge tank 314 can be adsorbed on the activated carbon C. Since the activated carbon C is excellent in adsorption capacity, tar can be efficiently removed from the waste water Y6.

  The activated sludge tank 314 accommodates the waste water Y6 and the activated sludge, and brings the tar in the waste water Y6 into the activated sludge by bringing the waste water Y6 and the activated sludge into contact with each other (treating the tar with the activated sludge). The tar is removed from the waste water Y6. Here, that activated sludge takes in tar indicates that cells of microorganisms (fungi, protozoa, metazoans) constituting activated sludge absorb tar. Further, as described above, in the activated sludge tank 314, the activated carbon C adsorbs the tar in the waste water Y6. And the activated sludge of the activated sludge tank 314 takes in the activated carbon C which adsorb | sucked the tar in addition to the tar simple substance.

  Thus, activated carbon introduction part 312 introduces activated carbon C into activated sludge tank 314, and activated sludge can take in not only tar simple substance but activated carbon C which adsorbed tar, and uptake of tar by activated sludge. Efficiency can be improved.

  The moisture adjusting unit 316 is composed of a centrifugal concentrator, a filter, and the like, and is generated in the activated sludge tank 314. The waste water from which tar is removed and the activated sludge that has taken in tar (activated carbon in which activated carbon C that has absorbed tar is taken in) Water Y9 is removed from a mixture Y7 containing sludge, the same applies hereinafter) and activated carbon C adsorbed with tar. If it does so, the mixture Y8 of the activated sludge which took in the tar and the activated carbon C which adsorb | sucked the tar will be produced | generated. The water Y9 removed by the moisture adjusting unit 316 is discharged or discarded.

  The second delivery unit 318 is configured by a pump or the like, and delivers the mixture Y8 to the gasification furnace 116.

  Since the mixture Y8 contains tar, the second delivery unit 318 sends the mixture Y8 to the gasification furnace 116, thereby gasifying the tar derived from the gasification raw material and activated carbon C as the gasification raw material. It can be gasified in the furnace 116. Therefore, it is possible to reduce the cost for discarding the mixture Y8 separated in the moisture adjusting unit 316 and the cost for landfilling the mixture Y8.

  In addition, 99% of the mixture Y7 introduced into the moisture adjusting unit 316 is water, and the amount of activated sludge and activated carbon incorporating the tar is only 1%. Therefore, when the second delivery unit 318 delivers the mixture Y7 generated in the activated sludge tank 314 as it is to the gasification furnace 116, the temperature of the gasification furnace 116 is lowered, and the gasification efficiency is lowered.

  Therefore, the water adjustment unit 316 can remove water from the mixture Y7 to reduce the water in the mixture Y8 to about 75% (concentrate 25 times). Therefore, the second delivery unit 318 sends the mixture Y7 (that is, the mixture Y8) after the water adjustment unit 316 removes water to the gasification furnace 116, thereby reducing the temperature drop of the gasification furnace 116, Tar can be reintroduced into the gasification furnace 116 while suppressing a decrease in gasification efficiency.

(First gasification gas generation method)
Next, a first gasification gas generation method using the gasification gas generation system 100 will be described. FIG. 3 is a flowchart for explaining the process flow of the first gasification gas generation method, and shows the process of sending the sediment Y5 separated by the sedimentation separation unit 220.

  As shown in FIG. 3, the first gasification gas generation method according to the present embodiment includes a gasification gas generation step S410, a cleaning / purification step S420, and a delivery step S430. Hereinafter, each process is explained in full detail.

(Gasified gas generation step S410)
The gasification furnace 116 generates the gasification gas X1 by supplying the gasification raw material. When the gasification gas generation step S410 is performed for the first time, the gasification raw materials are only solid raw materials such as coal such as lignite, petroleum coke (petro coke), biomass and tire chips, and liquid raw materials such as black liquor. However, when the second gasification gas generation method to be described later is performed, the gasification furnace 116 has solid materials such as coal such as brown coal, petroleum coke, biomass and tire chips as gasification materials. In addition to or instead of the liquid raw material such as black liquor, the mixture Y8 is introduced.

(Washing purification step S420)
The gasification gas X1 produced | generated in gasification gas production | generation process S410 is wash | cleaned and refine | purified using water, and the refinement | purification gasification gas X5 is produced | generated.

  More specifically, the gasification gas X1 is introduced into the gasification gas purification apparatus 200, and first, the tar contained in the gasification gas X1 is reformed in the reforming furnace 210.

  Subsequently, in the first heat exchanger 212, the gasified gas X2 reformed in the reforming furnace 210 is cooled and sent to the spray tower 214. In the spray tower 214, water is sprayed on the gasification gas X2, and tar is removed from the gasification gas X2. Thus, purified gas X3 and oil mixed water Y1 are generated. In the mist separator 216, water is sprayed on the purified gas X3, and tar is further removed from the purified gas X3. Thus, purified gas X4 and oil mixed water Y2 are generated.

  The purified gas X4 is sent to the second heat exchanger 218 and cooled, and tar is further removed from the purified gas X4. In this way, purified gas X5 and waste water Y3 are generated. The purified gas X5 is used in a subsequent process.

  The oil mixed water Y1 and the oil mixed water Y2 generated by the spray tower 214 and the mist separator 216 are sent to the sedimentation separation unit 220, and the sedimentation separation unit 220 settles and separates into a supernatant Y4 and a sediment Y5. .

  And sediment Y5 separated in sedimentation separation part 220 is processed by sending out process S430 mentioned below.

  On the other hand, the supernatant Y4 is treated in the waste water treatment step S450 of the second gasification gas production method described later together with the waste water Y3 produced in the second heat exchanger 218.

(Sending process S430)
The first delivery unit 222 sends the sediment Y5 generated in the cleaning / purification step S420 to the combustion furnace 112.

  Thereby, the tar in the sediment Y5 can be burned in the combustion furnace 112 using the fuel.

(Second gasification gas generation method)
Next, a second gasification gas generation method using the gasification gas generation system 100 will be described. FIG. 4 is a flowchart for explaining the process flow of the second gasification gas generation method, and shows the process of sending the mixture Y8 separated by the moisture adjusting unit 316.

  As shown in FIG. 4, the second gasification gas generation method according to the present embodiment includes a gasification gas generation step S410, a cleaning and purification step S420, a wastewater treatment step S450, a moisture adjustment step S460, and a delivery step. S470. Hereinafter, each process is explained in full detail. Note that the gasification gas generation step S410 and the cleaning purification step S420 already described in the first gasification gas generation method described above are substantially the same in processing, and therefore redundant description is omitted. Here, the processing is different. The waste water treatment step S450, the moisture adjustment step S460, and the delivery step S470 will be mainly described.

  In the second gasification gas generation method, activated sludge is previously stored in the activated sludge tank 314.

(Wastewater treatment process S450)
By contacting the wastewater Y3 and supernatant Y4 generated in the washing and purification step S420 with activated sludge, the tar in the wastewater Y3 and supernatant Y4 is taken into the activated sludge, and the wastewater Y3 and supernatant Y4. To remove tar.

  Specifically, the waste water Y3 and the supernatant Y4 are introduced into the waste water treatment system 300, and ammonia is first removed in the ammonia removal unit 310.

  Subsequently, the wastewater Y6 from which ammonia has been removed is introduced into the activated sludge tank 314. In addition, activated carbon C is introduced into the activated sludge tank 314 together with the waste water Y6 by the activated carbon introduction unit 312. If it does so, the activated sludge accommodated in the activated sludge tank 314 will take in the activated carbon C which adsorb | sucked the tar single-piece | unit and tar.

  And the mixture Y7 comprised including the waste_water | drain from which the tar was removed, the activated sludge which took in the tar, the activated sludge which took in the activated carbon C which adsorbed the tar, and the activated carbon C which adsorbed the tar is produced | generated, It is processed in the moisture adjustment step S460.

(Moisture adjustment step S460)
The moisture adjustment unit 316 removes water from the mixture Y7. By performing the moisture adjustment step S460, a mixture Y8 and water Y9 are generated. Then, the mixture Y8 is processed in the delivery step S470, and the water Y9 is discharged or discarded.

(Sending process S470)
The second delivery unit 318 sends the mixture Y8 generated in the moisture adjustment step S460 to the gasifier 116.

  The tar and activated carbon C in the mixture Y8 can be gasified in the gasification furnace 116 as a gasification raw material. That is, in the next gasification gas generation step S410, in addition to or in place of solid raw materials such as coal such as lignite, petroleum coke, biomass, tire chips, and liquid raw materials such as black liquor. The mixture Y8 can be used as a gasification raw material.

  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 case where the second delivery unit 318 delivers the mixture Y8 to the gasification furnace 116 has been described as an example. However, the second delivery unit 318 may deliver the mixture Y8 to the combustion furnace 112. By sending the mixture Y8 to the combustion furnace 112 by the second delivery unit 318, tar and activated carbon C derived from the gasification raw material can be burned in the combustion furnace 112 as fuel.

  In the above-described embodiment, the first delivery unit 222 has been described by taking as an example the case where the sediment Y5 is delivered to the combustion furnace 112, but the first delivery unit 222 gasifies the sediment Y5. It may be delivered to the furnace 116. By sending the sediment Y5 to the gasification furnace 116 by the first delivery unit 222, tar derived from the gasification raw material can be gasified in the gasification furnace 116 as a gasification raw material.

  In the above-described embodiment, the gasified gas generation system 100 has been described as having a configuration including two delivery units (a first delivery unit 222 and a second delivery unit 318). You may provide the one transmission part which integrated the function and the function of the 2nd transmission part 318. FIG.

  Further, in the above-described embodiment, the first sending unit 222 has been described with an example in which the sediment Y5 is sent to the combustion furnace 112 as it is. However, it may be sent to the combustion furnace 112 after removing water from the sediment Y5 using a centrifugal concentrator, a filter, or the like.

  In addition, each process of the gasification gas production | generation method of this specification does not necessarily need to process in time series along the order described as a flowchart.

  The present invention can be used for a gasification gas generation system and a gasification gas generation method for generating a gasification gas by gasifying a gasification raw material.

DESCRIPTION OF SYMBOLS 100 ... Gasification gas production system 112 ... Combustion furnace 116 ... Gasification furnace 214 ... Spray tower (cleaning refinement | purification part)
216 ... Mist separator (cleaning and purification section)
218 ... 2nd heat exchanger (cleaning and purification section)
220 ... Sediment separation part 312 ... Activated carbon introduction part 314 ... Activated sludge tank 316 ... Moisture adjustment part 318 ... Second sending part (sending part)

Claims (8)

A gasification furnace that gasifies the gasification raw material to generate gasification gas;
A cleaning and purifying unit that generates purified gasified gas by cleaning and purifying the generated gasified gas using water,
The wastewater generated in the washing and purification unit and activated sludge are accommodated, and the wastewater and the activated sludge are brought into contact with each other so that the gasification raw material-derived substance in the wastewater is taken into the activated sludge, An activated sludge tank for removing the gasification raw material-derived material from the waste water;
A moisture adjusting unit that removes water from a mixture that is generated in the activated sludge tank and that includes the wastewater from which the gasification raw material-derived material has been removed and the activated sludge that has incorporated the gasification raw material-derived material; ,
A delivery unit that sends out the activated sludge in which the material derived from the gasification raw material has been removed, the water being removed by the moisture adjustment unit, to the gasification furnace;
A gasified gas generation system comprising: An activated carbon introduction part for introducing activated carbon into the activated sludge tank;
In the activated sludge tank, the activated carbon adsorbs a gasification raw material-derived substance in the waste water,
The activated sludge in the activated sludge tank takes in activated carbon adsorbing the gasified raw material-derived material in addition to the gasified raw material-derived material,
The delivery unit includes the activated sludge incorporating the gasified raw material-derived material, the activated sludge charcoal incorporating the activated carbon adsorbing the gasified raw material-derived material, and the activated carbon adsorbing the gasified raw material-derived material as the gas. The gasification gas generation system according to claim 1, wherein the gasification gas generation system is sent to a gasification furnace. In the gasifier, the fluidized medium forms a fluidized bed,
A combustion furnace for heating the fluidized medium;
In addition to the gasification furnace, the delivery unit includes, in the combustion furnace, activated sludge incorporating the gasification raw material-derived material, activated sludge charcoal incorporating activated carbon adsorbing the gasification raw material-derived material, the gasification The gasification gas generation system according to claim 2, wherein one or more selected from the group of activated carbons adsorbing the raw material-derived substance are delivered. Further comprising a sedimentation separation unit for separating the wastewater into a supernatant and a sediment by the difference in specific gravity,
The activated sludge tank removes the gasification raw material-derived material from the supernatant,
The gasification gas generation system according to claim 3, wherein the delivery unit delivers the sediment to one or both of the gasification furnace and the combustion furnace. A gasification furnace in which a fluidized medium forms a fluidized bed, and gasified raw material is gasified by the fluidized medium to generate a gasified gas;
A combustion furnace for heating the fluidized medium;
A cleaning and purifying unit that generates purified gasified gas by cleaning and purifying the generated gasified gas using water,
The wastewater generated in the washing and purification unit and activated sludge are accommodated, and the wastewater and the activated sludge are brought into contact with each other so that the gasification raw material-derived substance in the wastewater is taken into the activated sludge, An activated sludge tank for removing the gasification raw material-derived material from the waste water;
A moisture adjusting unit that removes water from a mixture that is generated in the activated sludge tank and that includes the wastewater from which the gasification raw material-derived material has been removed and the activated sludge that has incorporated the gasification raw material-derived material; ,
A delivery unit for sending activated sludge that has taken in the gasification raw material-derived material from which water has been removed by the moisture adjustment unit to the combustion furnace;
A gasified gas generation system comprising: Further comprising a sedimentation separation unit for separating the wastewater into a supernatant and a sediment by the difference in specific gravity,
The activated sludge tank removes the gasification raw material-derived material from the supernatant,
The gasification gas generation system according to claim 5, wherein the sending unit sends the sediment to one or both of the gasification furnace and the combustion furnace. A gasification gas generation method using a gasification furnace that gasifies a gasification raw material to generate gasification gas,
Cleaning and purifying the produced gasification gas with water to produce a purified gasification gas; and
By contacting the wastewater generated in the step of generating the purified gasification gas and activated sludge, the material derived from the gasification raw material in the wastewater is taken into the activated sludge and derived from the gasification raw material from the wastewater. Removing the material;
A mixture that is formed in the step of removing the gasification raw material-derived substance from the waste water, and includes waste water from which the gasification raw material-derived substance has been removed, and activated sludge that has taken in the gasification raw material-derived substance. Removing water from the
Sending the activated sludge that has taken in the gasification raw material-derived material from which water has been removed to the gasification furnace;
A gasified gas generation method comprising: Gasified gas generation using a gasification furnace in which a fluidized medium forms a fluidized bed and gasified raw material is gasified by the fluidized medium to generate gasified gas, and a combustion furnace that heats the fluidized medium A method,
Cleaning and purifying the produced gasification gas with water to produce a purified gasification gas; and
By contacting the wastewater generated in the step of generating the purified gasification gas and activated sludge, the material derived from the gasification raw material in the wastewater is taken into the activated sludge and derived from the gasification raw material from the wastewater. Removing the material;
A mixture that is formed in the step of removing the gasification raw material-derived substance from the waste water, and includes waste water from which the gasification raw material-derived substance has been removed, and activated sludge that has taken in the gasification raw material-derived substance. Removing water from the
Sending the activated sludge that has taken in the gasified raw material-derived material from which water has been removed to the combustion furnace;
A gasified gas generation method comprising:

Images