JP4612648B2 - Gasification gas purification method - Google Patents

Description

  The present invention relates to a purification method for gasification gas obtained by thermally decomposing organic waste such as waste plastic and biomass or solid organic matter such as coal, and more particularly to a purification method for gasification gas using an activated carbon packed tower. .

  In recent years, effective use of energy has been attracting attention as part of global environmental conservation, especially prevention of global warming. Organic waste is a method for effectively using energy of organic waste such as waste plastic and biomass. So-called gasification, which obtains a combustible gas by pyrolyzing the gas, is attracting attention.

  However, combustible gas obtained by gasification, that is, gasification gas contains dioxin due to chlorine contained in organic waste, so it is necessary to remove dioxin when using gasification gas It is. In addition to dioxins, organic waste gasification gases include high-boiling hydrocarbon compounds that are liquid or solid at normal temperature and pressure, such as tar and light oil (in the present specification, simply “high-boiling hydrocarbon compounds”). Here, the boiling point of the “high-boiling hydrocarbon compound” is approximately 60 ° C. or higher). These high boiling hydrocarbon compounds have a high vapor pressure even at temperatures below the boiling point and are difficult to remove by cooling, etc., and the high boiling hydrocarbon compounds remaining in the gas condense when the temperature of the gasification gas decreases. In addition, it may cause equipment trouble by adhering to the gas piping and its ancillary equipment. Therefore, it is necessary to remove from gasification gas with dioxin.

  Conventionally, as a technique for removing dioxins in a gas, Patent Document 1 discloses a technique in which dioxins are decomposed by a catalyst layer and the remaining dioxins are adsorbed by an activated carbon layer. However, the technique of this patent document 1 is mainly intended for treating the combustion exhaust gas after burning a combustible substance, and when the technique of patent document 1 is applied to the treatment of gasification gas of organic waste. In the catalyst layer, hydrocarbon gases other than dioxins are also decomposed and soot is generated. Moreover, in the activated carbon layer, the above-described high boiling point hydrocarbon compound is adsorbed in addition to dioxin, and the activity of the activated carbon cannot be maintained. In order to sustain it, it is necessary to always use new activated carbon, which increases operating costs.

  In Patent Document 2, a dust collector such as a bag filter is provided, and powdered activated carbon is blown upstream thereof to form an activated carbon layer on the filter cloth surface of the bag filter, and dioxins are adsorbed on the activated carbon. This technique is disclosed. However, even in the technique of this Patent Document 2, when this is applied to the treatment of gasification gas of organic waste, troubles such as clogging occur due to the above-mentioned high boiling point hydrocarbon compound contained in the gasification gas, Stable operation cannot be continued.

  On the other hand, Patent Document 3 and Patent Document 4 disclose a purification technique using activated carbon to remove hydrocarbons such as solvents and light oil in exhaust gas. However, when the light oil contained in the gasification gas of organic waste is removed by activated carbon, it is difficult to control gas purification because the raw material of the gas is waste and the properties of the raw material are not stable. Since the gasified gas contains not only light oil but also tar, if the gas containing tar is purified by activated carbon, the tar is not easily separated from the activated carbon, and the life of the activated carbon is shortened.

  Patent Documents 5 and 6 disclose a technique for purifying biomass gas (gasification gas) obtained by pyrolyzing biomass using activated carbon. However, with this technology, it is possible to adsorb and remove tar components having a high gas treatment temperature and a high molecular weight and a high boiling point, but they have a low molecular weight, a relatively low boiling point, a high volatility, and a normal temperature. It is impossible to adsorb and remove liquid hydrocarbon compounds, so-called light oil components, under pressure. Light oil is cooled in the piping and drained when using gas. Since this drain is a highly volatile flammable oil, it is difficult to handle.

  In addition, in the case of gasification gas using raw materials other than biomass with uniform properties, the generation amount and properties of tar may change, the activated carbon adsorption layer may be clogged, and light oil may flow to the gas utilization facility, causing problems. There is sex. In particular, when fossil fuels such as waste plastics and coal, or solid organic substances made from fossil fuels are gasified, the amount of tar and light oil is large, and the above-mentioned technique cannot perform sufficient purification. .

  As described above, various techniques for purifying gas using activated carbon have been proposed in the past. However, when purifying gasification gas containing a high boiling point hydrocarbon compound, particularly tar and light oil, the above-mentioned problems are required. However, gasification gas purification technology using activated carbon has not been established.

  On the other hand, a gasification gas purification technique that does not use activated carbon has also been proposed. For example, Patent Document 7 discloses a technology for reducing tar content and light oil content in gasified gas by gasification of organic waste, reaction with oxygen and water vapor, and reforming reaction at a high temperature of about 1100 ° C. Proposed. However, gas purification technology using such a reforming reaction requires partial combustion of the gasified gas in order to obtain a heat source required for the reforming reaction. There is a problem of lowering. In addition, the production of oxygen used for the reforming reaction requires a lot of energy, and the total energy required for waste treatment becomes too large.

  As another gas cleaning technology, as seen in coke oven gas purification technology, there is a technology in which gas is cleaned with oil at a low temperature to remove tar content and light oil content in the gas. However, with this technique, energy is required to obtain a cold heat source for cleaning at low temperatures. Moreover, advanced treatment is required for the waste water after washing, and further, a step of regenerating oil and the like is required, and facilities such as treatment of gas generated at the time of regeneration tend to be complicated. Further, dioxins cannot be removed by gas cleaning.

  Thus, in order to purify the gas by simultaneously removing high-boiling hydrocarbon compounds such as dioxin, tar, and light oil in the gas, it is useful and simple to dry-process using activated carbon. Establishing gasification gas purification technology using methane is desired.

  On the other hand, when an organic substance is thermally decomposed to obtain a combustible gasification gas, it is desirable to keep hydrocarbon gas such as methane and keep gas calorie high when using the gasification gas. In this case, however, tar and light oil are by-produced and hinder gas utilization. Therefore, also from this point, establishment of a purification technique for removing tar and light oil in gasified gas is desired.

In order to stably remove high-boiling hydrocarbon compounds mainly composed of tar and light oil in gasification gas using activated carbon, high-boiling hydrocarbon compounds are periodically removed from activated carbon adsorbed with high-boiling hydrocarbon compounds. It is necessary to recover the adsorptive capacity of activated carbon by removing the. Therefore, it is necessary to recover and treat the high-boiling hydrocarbon compound released from the activated carbon. However, from the viewpoint of effective use of energy, the recovered high-boiling hydrocarbon compound is not simply disposed of but effective as a fuel. It is desirable to make it available.
Japanese Patent Laid-Open No. 2003-112012 JP-A-11-230529 JP-A-9-215908 JP 2005-66503 A JP 2006-16469 A JP 2006-16470 A JP 2004-238535 A

  The problem to be solved by the present invention is generally to establish a purification technology for gasification gas using activated carbon.

  Specifically, purification of gasification gas that enables effective utilization of high-boiling point hydrocarbon compounds released from activated carbon in order to restore the adsorption ability of activated carbon that has adsorbed high-boiling point hydrocarbon compounds in gasification gas It is to provide a method.

In the first aspect of the present invention , the gasification gas obtained by pyrolyzing organic waste or solid organic matter such as coal is passed through an activated carbon adsorption device comprising an activated carbon adsorption tower, and the activated carbon in the gasification gas is passed through. adsorbing the high boiling hydrocarbon compound with dioxins and normal temperature and pressure are liquid or solid, in the purification method of the gasification gas of high boiling hydrocarbon compounds adsorbed on the activated carbon adsorption tower is recovered by withdrawal from activated carbon, modified The reforming reaction in the quality furnace decomposes the tar content in the gasification gas, reduces the tar content, and the temperature of the gasification gas introduced into the activated carbon adsorption device exceeds 20 ° C and 100 ° C. The recovered high-boiling hydrocarbon compounds are separated from the light oil in the light oil recovery process of the coke oven gas refining equipment at the steelworks, after the light oil is separated in the distillation tower, or the light oil separated in the distillation tower. Min and mixed, characterized in that utilized. In the second embodiment of the present invention, the activated carbon type adsorption apparatus is installed in two stages in series in the gasification gas flow direction, and the tar-based high-boiling hydrocarbon compound separated and recovered by the first stage activated carbon type adsorption apparatus is In the light oil recovery process of the coke oven gas refining equipment at the steelworks, the light oil in the coke oven gas is mixed with the cleaning oil recovered in the coke oven gas at the absorption tower and used, separated and recovered by the second-stage activated carbon adsorption device. Oil-based high-boiling hydrocarbon compounds are used after being mixed with washing oil or light oil separated in the distillation tower after separation of light oil in the distillation tower in the light oil recovery process of the coke oven gas refining equipment at the steelworks It is characterized by doing. According to a third aspect of the present invention, in the above second aspect, the tar content in the gasification gas is decomposed by a reforming reaction in a reforming furnace in the preceding stage of the activated carbon adsorption device, and the content of the tar content is reduced. In addition, the temperature of the gasification gas introduced into the activated carbon adsorption device is over 20 ° C and below 100 ° C.

  In the present invention, waste plastic is typically gasified as organic waste, or coal is gasified as solid organic matter.

  The organic waste or solid organic gasification gas contains dioxin and a high-boiling hydrocarbon compound. High boiling point hydrocarbon compounds include tar components such as naphthalene and anthracene (polymer hydrocarbon compounds having 10 or more carbon atoms) and light oil components such as benzene, toluene and xylene (low carbon number of less than 10). Molecular hydrocarbon compounds). These dioxins and high boiling point hydrocarbon compounds need to be removed for effective use of the gasification gas, but in the present invention, as described above, the activated carbon-type adsorption device comprising the activated carbon adsorption tower allows organic waste or Dioxins and high-boiling hydrocarbon compounds contained in combustible gas in the gasification gas of solid organic matter are removed.

  That is, the activated carbon packed in the activated carbon adsorption tower has innumerable pores on the surface, and dioxin and polymer hydrocarbon compound molecules enter the pores to be adsorbed and removed from the gasification gas. .

  On the other hand, when the polymer hydrocarbon compound is adsorbed on the activated carbon, the pores of the activated carbon are blocked and the adsorption capacity is lowered. Therefore, it is necessary to periodically remove the high boiling point hydrocarbon compound from the activated carbon to restore the adsorption capacity of the activated carbon. is there. The adsorption ability of the activated carbon is recovered, for example, by passing steam through an activated carbon adsorption tower and vaporizing and separating the high boiling point hydrocarbon compound adsorbed on the pores of the activated carbon. Alternatively, the high-boiling point hydrocarbon compound adsorbed on the pores of the activated carbon can be vaporized and released by lowering the pressure in the activated carbon adsorption tower and passing the carrier gas.

  In the present invention, the high-boiling point hydrocarbon compound separated from the activated carbon is recovered, and the recovered high-boiling point hydrocarbon compound is a by-product obtained in the light oil recovery step of the coke oven gas refining facility of the ironworks or the light oil. Used by mixing with oil used in the recovery process. As described above, the high-boiling point hydrocarbon compound contained in the gasification gas contains a large amount of tar such as light oil mainly composed of benzene, toluene and xylene, and naphthalene. Therefore, by mixing this high-boiling hydrocarbon compound with the by-product obtained in the light oil recovery process of the coke oven gas refining equipment of the steelworks or the oil used in the light oil recovery process, there is no need to install new processing equipment. It can be effectively used as a fuel, a chemical raw material or the like.

  That is, in the light oil recovery process of the coke oven gas refining equipment at the steelworks, by washing the coke oven gas with cleaning oil, the light oil in the coke oven gas is dissolved in the cleaning oil, and this cleaning oil is distilled. Light oil is collected and the distilled cleaning oil is recycled for coke oven gas cleaning. The light oil obtained in the light oil recovery process of this coke oven gas refining equipment or the cleaning oil used in the same process By mixing the high boiling point hydrocarbon compound with the above, it can be effectively used as a fuel, a chemical raw material or the like without newly installing a treatment facility.

  According to the present invention, in a gasification gas purification method using activated carbon, the high boiling point hydrocarbon compound separated from the activated carbon in order to recover the adsorption ability of the activated carbon that has adsorbed the high boiling point hydrocarbon compound in the gasification gas. Can be effectively used as fuel, chemical raw material, etc. without being newly installed.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 is a configuration diagram of equipment for carrying out the gasification gas purification method of the present invention.

  In FIG. 1, the activated carbon adsorption device 1 is composed of two activated carbon adsorption towers 1a and 1b. The gasification gas obtained in the gasification furnace 2 that gasifies organic waste passes through the gasification gas supply main 3, passes through the reforming furnace 4, and then gasifies to the activated carbon adsorption towers 1a and 1b, respectively. The gas passes through the gas supply branch pipes 3a and 3b and is introduced into the activated carbon adsorption towers 1a and 1b from below.

  When the gasification gas is introduced into the activated carbon adsorption towers 1a and 1b, dioxins and high-boiling hydrocarbon compounds in the gasification gas are adsorbed by the activated carbon in the activated carbon adsorption towers 1a and 1b, and then the gasification gas is activated carbon. The gas is discharged from the gasification gas discharge branch pipes 5 a and 5 b connected to the upper portions of the adsorption towers 1 a and 1 b, joins the gasification gas discharge main pipe 5, and is conveyed to the gas utilization facility 6. Specific uses of gasified gas include fuel for industrial furnaces such as heating furnaces and coke ovens, fuel for gas engines and gas turbines, boiler fuel, fuel for hot stove furnaces, and the like.

  The gasification gas supply branch pipes 3a and 3b and the gasification gas discharge branch pipes 5a and 5b are provided with on-off valves 3c and 3d and on-off valves 5c and 5d, respectively. Further, each of the activated carbon adsorption towers 1a, 1b is connected to steam supply branch pipes 7a, 7b branched from the steam supply main pipe 7 at the upper part and connected to waste steam discharge branch pipes 8a, 8b at the lower part. The steam supply branch pipes 7a and 7b and the waste steam discharge branch pipes 8a and 8b are provided with on-off valves 7c and 7d and on-off valves 8c and 8d, respectively.

  In addition, as the gasification furnace 2, various furnaces, such as a shaft furnace, a rotary kiln furnace, a fluidized bed furnace, a fixed bed furnace, a jet-flow furnace, can be used. Further, the heating method of the gasification furnace 2 may be either a partial combustion method in which the generated gasification gas is partially burned and used as a heat source, or an external heat method using an external heat source.

  Further, the reforming furnace 4 removes excess tar and light oil in the gasification gas by a reforming reaction in which the gasification gas obtained in the gasification furnace 2 is reacted with oxygen and water vapor at about 800 to 1100 ° C. Although it is reduced, it can be omitted when there is no need for reforming.

  In addition, as operation conditions, it is preferable that the gas temperature of the gasification gas introduce | transduced into activated carbon adsorption tower 1a, 1b shall be 100 degrees C or less. If the gas temperature exceeds 100 ° C., the vapor pressure of the high-boiling hydrocarbon compound in the gasification gas becomes high, the volatility becomes higher than the adsorption power by the activated carbon, and sufficient adsorption capacity cannot be secured. The gas temperature is preferably 60 ° C. or lower. However, if the gas temperature is set to 20 ° C. or lower, for example, the temperature of the cooling water necessary for cooling the gasification gas cannot be obtained by general equipment such as a cooling tower, and a refrigerator is required. Use of a refrigerator is not preferable because it imposes a heavy burden on equipment costs and running costs. Moreover, the temperature of the vapor | steam introduce | transduced for the adsorption capacity recovery | restoration of an activated carbon adsorption tower shall be 80-300 degreeC.

  In the above configuration, at the start of operation, gasification gas is passed through both activated carbon adsorption towers 1a and 1b, and if the adsorption capacity of one of the activated carbon adsorption towers decreases thereafter, or the gasification gas is passed through the gas passage. When the time elapses, the gasification gas flow to one of the activated carbon adsorption towers whose adsorption capacity is reduced is shut off.

  For example, when shutting off gas flow to the activated carbon adsorption tower 1a, the on-off valve 3c of the gasification gas supply branch 3a and the on-off valve 5c of the gasification gas discharge branch 5a are closed. Then, the open / close valve 7c of the steam supply branch pipe 7a and the open / close valve 8c of the waste steam discharge branch pipe 8a are opened, and steam is passed through the activated carbon adsorption tower 1a to restore the adsorption capacity. When the adsorption capacity is restored, the on-off valve 7c of the steam supply branch 7a and the on-off valve 8c of the waste steam discharge branch 8a are closed, and the on-off valve 3c of the gasification gas supply branch 3a and the on-off valve of the gasified gas discharge branch 5a 5c is opened and gasification gas passage is resumed.

  After that, when the adsorption capacity of the other activated carbon adsorption tower 1b is reduced, the gasification gas is shut off and then the adsorption capacity is recovered through steam, as in the case of the activated carbon adsorption tower 1a. Restart the gas flow. In this embodiment, by repeating such an operation, it is possible to continuously purify the gasification gas while maintaining the adsorption capacity.

  When the adsorption capacity of the activated carbon adsorption tower is restored, the high-boiling hydrocarbon compound adsorbed on the activated carbon by vapor passing is vaporized and recovered as waste steam. The waste steam containing the high-boiling hydrocarbon compound or the waste drain condensed with the waste steam is once put into the separator 9 through the waste steam discharge main pipe 8, and the waste steam is condensed by cooling or the like. Hydrogen compounds are separated from moisture. The high-boiling point hydrocarbon compound separated and recovered by the separator 9 is mixed with the by-product obtained in the light oil recovery process of the coke oven gas refining facility of the steelworks or the oil used in the same process as described later. Is done.

  In the light oil recovery process of the coke oven gas refining equipment shown in the lower part of FIG. In the absorption tower 10, cleaning oil is sprayed from above, and the light oil in the coke oven gas is dissolved in the cleaning oil, and separated and recovered from the coke oven gas. The cleaning oil in which the light oil in the coke oven gas is dissolved is introduced into the distillation column 11, and the light oil in the cleaning oil is separated by distillation and recovered. On the other hand, the cleaning oil after distillation is circulated and used for cleaning the coke oven gas in the absorption tower 10.

  Thus, in the light oil recovery process of the coke oven gas refining equipment, light oil is obtained as a by-product, and cleaning oil is used. In this embodiment, these oils are separated and recovered by the above-described separator 9. High boiling point hydrocarbon compounds are mixed and used.

  For example, if the light oil in the coke oven gas is mixed in the absorption tower 10 with the recovered cleaning oil as shown by the piping system 13a in FIG. 1, the separated high-boiling hydrocarbon compound is recovered in the distillation tower 11 together with the cleaning oil. The light oil contained in the high-boiling hydrocarbon compound introduced and separated and recovered is separated and recovered together with the light oil in the cleaning oil, and can be used as fuel for the steel mill after being liquefied by the condenser. Further, since the separated high-boiling hydrocarbon compound contains a large amount of naphthalene as a tar component, it is also possible to separate and recover naphthalene in the distillation column 11, and use this naphthalene as a chemical raw material or the like. Can do.

  Further, as shown by the piping system 13b in FIG. 1, the high boiling point hydrocarbon compound separated and recovered by the separation device 9 may be mixed with the cleaning oil after the light oil component is separated by the distillation column 11, FIG. As shown by the piping system 13c, it may be mixed with the light oil separated in the distillation column 11. However, in these cases, it is preferable to lower the content of tar such as naphthalene in the separated high-boiling hydrocarbon compound. In order to lower the tar content, the tar content in the gasification gas may be decomposed by the reforming reaction in the reforming furnace 4 described above.

  Although three piping systems 13a to 13c are shown at the same time in FIG. 1, in reality, these three systems are not used at the same time. Either one system is provided or any one of the three systems is used. Select the system selectively.

  In addition, if the activated carbon type adsorption device 1 as shown in FIG. 1 is installed in two stages in series in the gasification gas flow direction, the tar content is mainly adsorbed by the first stage activated carbon type adsorption device, and the second stage Since the remaining light oil is adsorbed by the activated carbon adsorber, in this case, the high boiling point hydrocarbon compound mainly composed of tar separated and recovered by the first-stage activated carbon adsorber is absorbed in the coke oven gas by the absorption tower 10. The high-boiling hydrocarbon compounds mainly composed of light oil separated by the second stage activated carbon adsorption device are mixed with the washing oil recovered from the light oil in the second stage. What is necessary is just to mix with the light oil component isolate | separated in the tower | column 11.

  In the above embodiment, steam was used to recover the adsorption capacity of the activated carbon in the activated carbon adsorption tower, but the method for restoring the adsorption capacity of the activated carbon is not limited to this, for example, a decrease in the adsorption capacity The activated carbon adsorption tower may be configured to shut off the gasification gas, reduce the pressure in the activated carbon adsorption tower, and discharge the high-boiling hydrocarbon compound adsorbed by passing the carrier gas to the carrier gas side. . In this case, the high boiling point hydrocarbon compound discharged to the carrier gas side is recovered and used by mixing with the by-product obtained in the light oil recovery process of the coke oven gas refining equipment at the steelworks or the oil used in the same process. .

It is a block diagram of the equipment which implements the purification method of the gasification gas of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Activated carbon type adsorption apparatus 1a, 1b Activated carbon adsorption tower 2 Gasification furnace 3 Gasification gas supply main 3a, 3b Gasification gas supply branch 3c, 3d On-off valve 4 Reforming furnace 5 Gasification gas discharge main 5a, 5b Gas Gasified gas discharge branch 5c, 5d On-off valve 6 Gas utilization equipment 7 Steam supply main pipe 7a, 7b Steam supply branch pipe 7c, 7d On-off valve 8 Waste steam discharge main pipe 8a, 8b Waste steam discharge branch pipe 8c, 8d On-off valve 9 Separation device DESCRIPTION OF SYMBOLS 10 Absorption tower 11 Distillation tower 12 Capacitor 13a-13c Piping system

Claims (3)

Gasified gas obtained by pyrolyzing organic waste or solid organic matter such as coal is passed through an activated carbon type adsorption device consisting of an activated carbon adsorption tower, and the activated carbon is dioxin in the gasified gas and liquid or solid at normal temperature and pressure in it was adsorbed high-boiling hydrocarbon compounds, the method of purifying the gasification gas of high boiling hydrocarbon compounds adsorbed on the activated carbon adsorption tower is recovered by withdrawal from the activated carbon,
The tar content in the gasification gas is decomposed by the reforming reaction in the reforming furnace, the tar content is reduced, and the temperature of the gasification gas to be introduced into the activated carbon adsorption device exceeds 20 ° C. and 100 ℃ or less,
The recovered high-boiling hydrocarbon compounds are used after being mixed with the washing oil or the light oil separated by the distillation tower after the light oil is separated by the distillation tower in the light oil recovery process of the coke oven gas refining equipment at the ironworks. A method for purifying gasified gas, characterized in that: Gasified gas obtained by pyrolyzing organic waste or solid organic matter such as coal is passed through an activated carbon type adsorption device consisting of an activated carbon adsorption tower, and the activated carbon is dioxin in the gasified gas and liquid or solid at normal temperature and pressure In the purification method of gasification gas which adsorbs the high-boiling point hydrocarbon compound which is, and separates and recovers the high-boiling point hydrocarbon compound adsorbed on the activated carbon of the activated carbon adsorption tower from the activated carbon,
Two stages of activated carbon adsorption devices are installed in series in the gasification gas flow direction.
The high-boiling point hydrocarbon compound mainly composed of tar collected and recovered by the first-stage activated carbon adsorption device recovered light oil in the coke oven gas at the absorption tower in the light oil recovery process of the coke oven gas refining equipment at the ironworks. Use it mixed with cleaning oil,
The high-boiling hydrocarbon compound mainly composed of light oil separated and recovered by the second-stage activated carbon-type adsorber is either washed oil after separation of light oil by the distillation tower in the light oil recovery process of the coke oven gas refining equipment at the ironworks. A method for purifying gasification gas, which is used by mixing with the light oil separated in the distillation column . Gasified gas obtained by pyrolyzing organic waste or solid organic matter such as coal is passed through an activated carbon type adsorption device consisting of an activated carbon adsorption tower, and the activated carbon is dioxin in the gasified gas and liquid or solid at normal temperature and pressure In the purification method of gasification gas which adsorbs the high-boiling point hydrocarbon compound which is, and separates and recovers the high-boiling point hydrocarbon compound adsorbed on the activated carbon of the activated carbon adsorption tower from the activated carbon,
The tar content in the gasification gas is decomposed by the reforming reaction in the reforming furnace, the tar content is reduced, and the temperature of the gasification gas to be introduced into the activated carbon adsorption device exceeds 20 ° C. and 100 ℃ or less,
Furthermore, two stages of activated carbon adsorption devices are installed in series in the gasification gas flow direction.
The high-boiling point hydrocarbon compound mainly composed of tar collected and recovered by the first-stage activated carbon adsorption device recovered light oil in the coke oven gas at the absorption tower in the light oil recovery process of the coke oven gas refining equipment at the ironworks. Use it mixed with cleaning oil,
The high-boiling hydrocarbon compound mainly composed of light oil separated and recovered by the second-stage activated carbon-type adsorber is either washed oil after separation of light oil by the distillation tower in the light oil recovery process of the coke oven gas refining equipment at the ironworks. A method for purifying gasification gas, which is used by mixing with the light oil separated in the distillation column .

Images