Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B7/00—Hydraulic cements
  • C04B7/36—Manufacture of hydraulic cements in general
  • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
  • C04B7/44—Burning; Melting
  • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F11/00—Treatment of sludge; Devices therefor
  • C02F11/06—Treatment of sludge; Devices therefor by oxidation
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F11/00—Treatment of sludge; Devices therefor
  • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
  • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
  • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
  • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
  • F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B23/00—Heating arrangements
  • F26B23/001—Heating arrangements using waste heat
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B23/00—Heating arrangements
  • F26B23/02—Heating arrangements using combustion heating
  • F26B23/028—Heating arrangements using combustion heating using solid fuel; burning the dried product
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
  • F26B25/005—Treatment of dryer exhaust gases
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2290/00—Organisational aspects of production methods, equipment or plants
  • C04B2290/20—Integrated combined plants or devices, e.g. combined foundry and concrete plant
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
  • F23G2206/00—Waste heat recuperation
  • F23G2206/20—Waste heat recuperation using the heat in association with another installation
  • F23G2206/201—Waste heat recuperation using the heat in association with another installation with an industrial furnace
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
  • F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E20/00—Combustion technologies with mitigation potential
  • Y02E20/30—Technologies for a more efficient combustion or heat usage
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P40/00—Technologies relating to the processing of minerals
  • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
  • Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing

Definitions

• the present invention relates to a processing method and a processing apparatus for high water content organic waste, and more specifically, by drying the high water content organic waste using a cement firing facility. Waste can be effectively used as a fuel for cement firing facilities, but despite the use of gas extracted from the cement firing facility, there is no risk of adverse effects on the operation of the cement firing facility.
• the present invention relates to a processing method and a processing apparatus for high water content organic waste capable of improving the operation efficiency of a firing facility.
• organic hydrated (dehydrated) sludge such as sewage sludge can be cited as an example.
• This hydrated sludge is not subjected to pretreatment such as drying or additive addition.
• a sludge treatment method that is introduced into a furnace and incinerated has been proposed! (Patent Document 1).
• Patent Document 2 In order to reduce the impact of such high water content organic wastes on the operation of cement firing equipment, using the extraction gas from the clean power cooler of the cement firing equipment directly, In addition to processing to dry waste, effective use of dried organic waste as fuel is also being promoted! (Patent Document 2).
• FIG. 3 is a schematic diagram showing a cement production facility equipped with a conventional high moisture content organic waste drying treatment equipment, which uses exhaust gas from a cement firing facility. It is an example of the apparatus which dries.
• 1 is a rotary kiln
• 2 is a suspension preheater
• 2a to 2d are suspension preheaters
• 3 is a calcining furnace
• 4 is a clean power cooler
• 5 is an electric dust collector
• 6 is a suction fan.
• 7 is an exhaust chimney
• 8a to 8c are cooling air fans for the clean power cooler 4
• 9 is a suction fan (IDF) for sucking exhaust gas from the suspension preheater 2
• 10 is a secondary air duct for the calciner 3
• 11 is a clean air
• 12 is an exhaust duct of the suspension preheater
• 13 is a raw material supply line to the suspension preheater 2.
• 14 is a drying treatment apparatus, and an extraction duct 15 for extracting a part of the exhaust gas discharged from the clean power cooler 4 and a high water content organic waste are dried using the extracted exhaust gas.
• a dust collector 17 that collects dust from the exhaust gas containing the dried organic waste, and an exhaust duct for reusing the exhaust gas after the dust collection as cooling air for the clean power cooler 4 18 and an exhaust introduction fan 19.
• the dried organic waste obtained by the drying treatment apparatus 14 is effectively used as a fuel for cement burning equipment.
• the exhaust gas after drying contains a large amount of odor components, etc.
• the odor components, etc. are introduced into the clean power cooler of the cement firing equipment as high temperature clean power cooling air,
• the exhaust gas after cooling as secondary air for fuel combustion in a rotary kiln or calciner, it is completely burned and decomposed.
• This high water content organic waste drying device adjusts the water content by mixing and stirring the sludge cake made of high water content organic waste and mixing and stirring the circulating dry powder of sludge dried by airflow. After crushing with a crusher in the dryer, the product is dried in a drying duct and then collected with a cyclone to obtain a dry powder. A certain amount of the obtained dry powder is rotary on the cement firing equipment. It is blown into the kiln and used as part of the fuel for cement clean power firing.
• the heat medium for drying is exhaust gas (water vapor) generated by drying the sludge cake
• the high-temperature part of the cement baking equipment is the exhaust gas heating part for indirectly heating the exhaust gas.
• Introducing the above exhaust gas to heat 'deodorize circulate a part of this heated' deodorized exhaust gas to the above crusher, bleed the increased exhaust gas out of the system, and heat and deodorize exhaust gas
• a heat exchanger is used for heat exchange between the remaining portion of the gas and the exhaust gas from the cyclone of the dryer, and the exhaust gas from the cyclone is preheated.
• Patent Document 4 A method for producing cement has been proposed.
• the halogen-containing waste is thermally decomposed by indirect heating using high-temperature gas extracted from the suspension pre-heater of the cement firing equipment, and the generated halogen compounds are removed, while the combustible materials from which the halogen compounds have been removed are removed. Gas and residue are effectively used as fuel for cement burning equipment.
• a high-temperature gas extracted from a suspension preheater is used as a heat source.
• high-temperature gas in cement firing equipment includes high-temperature air extracted from the clean power cooler and high-temperature gas extracted from the bottom of the kiln of the rotary kiln.
• high-temperature gas extracted from the suspension preheater it is possible to effectively use the heat source of the cement firing facility, which has a relatively small effect on the operation of the cement firing facility.
• Patent Document 1 Japanese Patent Laid-Open No. 8-276199
• Patent Document 2 Japanese Patent Laid-Open No. 63-151650
• Patent Document 3 Japanese Patent Laid-Open No. 2002-273492
• Patent Document 4 Japanese Unexamined Patent Publication No. 2006-206386
• This increase in gas unit consumption may adversely affect the operation of cement burning equipment, such as a decrease in the amount of cement cleansing fire and an increase in the calorific value for calcining (heat intensity unit).
• the high-temperature part of the cement baking equipment body is used as a heating part (heat exchange part) for heating a heat medium used for drying, it can be used as a heating part.
• the high temperature portion is limited to the lower region of the suspension preheater and the high temperature region of the upstream portion of the cleansing cooler. If selected, the heat medium will take away a large amount of sensible heat from the gas inside the cement firing equipment and the heating raw material. Therefore, there has been a problem that the unit of calorific power of the clinching power firing of the cement firing equipment may be deteriorated and the strength and the clinching power firing ability may be lowered.
• the decrease in the amount of cement cleansing power and the increase in the calorific value of the cement firing facility are the reduction in the amount of cleansing of the clean power compared to the case where it is directly input to the kiln bottom of the rotary kiln.
• the rate is limited to ⁇ 50%, the increase in the calorific value becomes 80%.
• most of the drying heat source is obtained by depriving the cement calcining facility of useful heat, so that compared to the method using exhaust gas etc. of other cement calcining facilities, The problem is that if the heat consumption in the facility is greatly deteriorated, the required cement production cannot be obtained! There was a point.
• the temperature of the exhaust gas after heat exchange which is not sufficient for heat transfer, is returned to the suspension preheater while maintaining a high temperature.
• the exhaust gas in the high temperature state is joined to the exhaust duct of the suspension preheater.
• the temperature of the exhaust gas from the suspension preheater may increase, leading to a reduction in the gas processing capacity of the suction fan (IDF) and, in turn, a reduction in the production capacity of the cement firing equipment.
• IDF suction fan
• the present invention has been made in order to solve the above-described problems, and the high water content organic waste such as sewage sludge is dried by using a cement firing facility. High water content that can effectively use organic waste as a fuel for cement firing equipment, and there is no risk of affecting the operation of cement firing equipment. To provide organic waste treatment methods and treatment equipment.
• the present inventors have dried a high water content organic waste using a heat medium exchanging heat with a high-temperature gas collected from a cement firing facility. This dry organic waste is then recycled, and the dried heating medium is heat-exchanged with high-temperature gas again and recycled for drying high-water content organic waste. Or, if it is supplied to the combustion device and burned, this dry organic waste can be used effectively as a fuel for cement burning equipment, and the residue after combustion can be used as a raw material for cement clinker. As a result, the present inventors have found that there is no risk of adversely affecting the operation of cement firing equipment and cement quality.
• the high water content organic waste treatment method of the present invention is a treatment method for fueling and burning high water content organic waste using a cement firing facility,
• the high water content organic waste is dried to a dry organic waste by using a heat medium exchanging heat with the high temperature gas collected from the firing facility, and the dried heat medium is again used as the high temperature gas.
• the high water content organic waste is dried using a heat medium exchanging heat with a high temperature gas collected from a cement firing facility, and dried organic waste. Therefore, the exhaust gas generated by this drying is only water vapor. Therefore, even when this exhaust gas is processed by the cement firing equipment, there is no risk of affecting the operation of the cement firing equipment.
• Organic waste is a fuel for cement burning equipment. It is used effectively.
• the dried heat medium is again heat-exchanged with a high-temperature gas and recycled for drying high-water-content organic waste, the heat medium is reused efficiently and effectively, and there is no waste.
• the dry organic waste in the combustion step, is disposed at one or more of a rotary kiln, a calciner, and a suspension preheater of the cement firing facility. It is a process of supplying and burning.
• dry organic waste is supplied to one or more of the rotary kiln, calciner and suspension preheater of the cement firing facility and burned. Waste can be effectively used as a fuel for cement clean power firing, and since it is dry, there will be no impact on the operation of cement firing facilities.
• the high temperature gas is obtained by extracting from one or more of the cyclone gas outlets of each stage of the suspension preheater of the cement burning equipment.
• the heating medium after drying is superheated steam generated by drying the high water content organic waste.
• the high temperature gas collected from the cement firing facility is extracted from one or more of the cyclone gas outlets of the suspension preheater of the cement firing facility.
• the amount of gas passing through the cement firing device is increased, and the cement crimping power firing ability of the cement firing device can be improved.
• the heating medium after drying is superheated steam generated by drying organic waste with a high water content, so that the heating medium used directly in the drying process can be minimized and the cement firing equipment No impact on operations.
• the high-temperature gas is exhaust gas discharged from a suspension preheater of the cement burning equipment, or extracted gas extracted from a clinker cooler of the cement firing equipment. Any one of the above, 1 type or 2 types, and the heating medium after drying is superheated steam generated by drying the high water content organic waste.
• the high-temperature gas collected from the cement firing facility is extracted from the exhaust gas that also discharges the suspension preheater force of the cement firing facility, and the cleansing cooler of the cement firing facility.
• the high water content organic waste processing method of the present invention is characterized in that a part of the superheated steam is extracted and deodorized, and then introduced into the cement firing facility.
• the high water content organic waste processing apparatus of the present invention is a processing apparatus for fuelizing and burning high water content organic waste using a cement firing facility, wherein the cement Heat exchange means for exchanging heat between the high-temperature gas collected from the firing facility and the heat medium, and drying the high water content organic waste using the heat exchanged heat medium and the dried organic waste Drying treatment means, a circulation line for circulating the dried heat medium between the heat exchanging means and the drying treatment means, and the dried organic waste as the cement baking equipment. And a supply line for supplying to the combustion device.
• this high water content organic waste treatment apparatus heat exchange is performed between the high-temperature gas separated from the cement firing facility and the heat medium by the heat exchange means, and this heat treatment is performed by the drying treatment means.
• the high-moisture content organic waste is dried to dry organic waste using the exchanged heat medium, and this dry organic waste is supplied to a cement firing facility or a combustion device through a supply line to perform combustion treatment. .
• the dry organic waste obtained by effectively using the sensible heat of the exhaust gas that is also discharged by the cement baking equipment is effectively used as a fuel for cement burning equipment.
• the heat medium can be reused efficiently and effectively by exchanging heat with the high-temperature gas again and recycling it to dry organic waste with a high water content.
• the high moisture content organic waste processing apparatus of the present invention comprises a deodorizing means for extracting a part of the superheated steam generated by the drying means and subjecting the extracted superheated steam to a deodorizing process. It is characterized by becoming.
• the high moisture content organic waste processing apparatus of the present invention extracts a part of the superheated steam generated by the drying means, and the extracted superheated steam is heated to 800 ° C or more of the cement firing facility. It is characterized by having a deodorization treatment line that is directly introduced into the place and performs deodorization treatment.
• a part of the superheated steam generated by the drying means is extracted by the deodorization treatment line, and then directly introduced into the cement firing facility at a temperature of 800 ° C or higher.
• deodorizing treatment of steam it can also be used for simple deodorizing treatment of superheated steam. Regardless, it is possible to efficiently treat high water content organic waste.
• the high moisture content organic waste processing apparatus of the present invention is the above-described one of the power of the cyclone gas outlet of each suspension preheater of the cement baking equipment, and the extraction gas separated from one or more locations as a high temperature gas.
• This high water content organic waste treatment device is characterized by comprising a line to be introduced into the heat exchange means, and the suspension preheater in each stage of the suspension preheater of the cement firing equipment is provided by a line to be introduced into the heat exchange means for the high temperature gas.
• the ability to ventilate cement firing equipment can be improved by separating hot gas from one or more locations at the gas outlet, and this is due to the operation of this high moisture content organic waste treatment system. There is no risk of deterioration of the cement cleansing ability, and organic waste with high water content can be treated efficiently.
• the high water content organic waste treatment apparatus of the present invention includes a line for introducing the exhaust gas from the suspension preheater of the cement firing equipment into the heat exchange means as a high-temperature gas, and a crimping power cooler of the cement firing equipment.
• a line for introducing the extracted gas extracted into the heat exchanging means as a high-temperature gas are provided.
• the exhaust gas collected from the suspension preheater is introduced into the heat exchange means as a high-temperature gas, and the extraction gas extracted from the clean power cooler is used as the high-temperature gas for heat exchange.
• the exhaust gas separated from the suspension preheater or the extraction gas extracted from the clinker cooler is used as a high-temperature gas, and also to exchange heat.
• the high water content organic waste is dried and dried using a heat medium exchanging heat with a high-temperature gas collected from a cement firing facility. Because it is a mechanical waste, it is possible to effectively use the dry organic waste obtained without fear of affecting the operation of the cement firing equipment as the fuel for the cement firing equipment. In addition, since the dried heat medium is again heat-exchanged with a high-temperature gas and recycled for drying high water content organic waste, the heat medium can be reused efficiently and effectively.
• heat exchange means for exchanging heat between the high-temperature gas collected from the cement firing facility and the heat medium, and the heat-exchanged heat
• a drying process means that dries the high water content organic waste using a medium to form a dry organic waste, and the dried heat medium is circulated between the heat exchange means and the drying treatment means.
• the heat medium since the dried heat medium is again heat-exchanged with a high-temperature gas and recycled for drying high water content organic waste, the heat medium can be reused efficiently and effectively.
• FIG. 1 is a schematic diagram showing a cement burning facility provided with an organic sludge treatment apparatus according to a first embodiment of the present invention.
• FIG. 2 is a schematic view showing a cement burning facility provided with an organic sludge treatment apparatus according to a second embodiment of the present invention.
• FIG. 3 is a schematic diagram showing a cement production facility equipped with a conventional high water content organic waste drying treatment apparatus.
• FIG. 1 is a schematic diagram showing a cement firing facility equipped with a high water content organic waste treatment apparatus according to the first embodiment of the present invention, in which organic sludge is used as a high water content organic waste.
• This is an example of a treatment apparatus that dries this organic sludge using exhaust gas from a cement firing facility or extracted high temperature gas into fuel, and burns the resulting dried organic sludge using a cement firing facility.
• 21 is an organic sludge treatment device, which is a heat exchanger that exchanges heat between exhaust gas (high-temperature gas) and steam (heat medium) collected from the suspension preheater 2 of the cement firing equipment ( (Heat exchange means) 22, a dryer (drying means) 23 that dries organic sludge using this heat-exchanged superheated steam (heat medium) to dry organic sludge, and a deodorizer that deodorizes the superheated steam (Deodorizing means) 24, hopper 25 for storing dried organic sludge, hot gas extraction duct (line) 26, exhaust duct (line) 27, superheated steam line (circulation line) 28, superheated steam Line (bleeding line) 29, organic sludge supply line 30 for supplying organic sludge to dryer 23, and supply line 31 for supplying dry organic sludge to calciner 3.
• the high-temperature gas and superheated steam line 28 separated from the gas outlet of the second-stage cyclone 2b of the suspension preheater 2 are circulated.
• Steam (heat medium) is introduced into the heat exchanger 22, and the steam is heated by this high-temperature gas to form superheated steam (heat medium).
• the superheated steam is introduced into the dryer 23 via the superheated steam line 28, and the organic sludge introduced by the organic sludge supply line 30 is dried in the dryer 23 to obtain dried organic sludge.
• the dried organic sludge is temporarily stored in the hopper 25, and then supplied as fuel to the calciner 3 through the supply line 31, and is combusted.
• This organic sludge treatment apparatus 21 uses a high-temperature gas extracted from the outlet gas of the second-stage cyclone 2b from the uppermost-stage cyclone 2a of the suspension preheater 2 to dry the steam by heat exchange.
• a drying method based on the superheated steam circulation method effective utilization of the high-temperature gas in the cement firing facility and efficiency improvement of the cement firing facility are being attempted.
• the exhaust gas temperature of the suspension preheater 2 is decreased by extracting rather than the effective utilization of the exhaust gas at the outlet of the cyclone 2b is low. Compensates for heat loss due to exhaust gas, There is no increase in the basic unit.
• the temperature of the extracted exhaust gas is lowered due to heat exchange in the dryer 23, and the ventilation capacity of the suction fan (IDF) 9 that sucks the gas combined with the exhaust gas from the suspension preheater 2 is increased.
• IDF suction fan
• the clinching power firing ability of the cement firing equipment is increased.
• the calorific intensity can be improved by the improvement of the clinching ability.
• the improvement effect of the clean power firing capacity is the force S that increases as the extraction position of the exhaust gas becomes the lower cyclone, and in the lower cyclone, the amount of heat loss due to the extraction gas increases, which has an effect on the heat intensity.
• the rate of increase in the capacity for clinching of cement firing facilities will decrease. Therefore, the cyclone to be extracted is most preferably the second-stage cyclone 2b, and the third-stage cyclone 2c is the second most preferred.
• the temperature of the hot gas extracted from the gas outlet force of the second-stage cyclone 2b is usually in the range of 550 to 650 ° C.
• This high-temperature gas is obtained by extracting from a position where the powder raw material input by the raw material supply line 13 for cement powder raw material is not mixed.
• the amount of high-temperature gas to be extracted is sufficient for the amount of heat required to evaporate the moisture contained in the organic sludge and make it into superheated steam, since the moisture content of the organic sludge to be dried is about 80% by weight. A sufficient amount is needed. In other words, it is necessary to extract a gas amount of usually 4 to 8 Nm 3 per kg of organic sludge.
• the hot gas extraction duct 2 6 It is preferable to attach a dust collector such as a cyclone.
• a dust collector such as a cyclone is attached to the outside 27 of the exhaust duct, and the dust in the exhaust gas after being cooled by this heat exchanger 22 is collected by the dust collector, so that it can be collected in the subsequent suction fan (IDF) 9 etc. You may prevent that a volatile component adheres.
• the high-temperature gas extracted from the suspension preheater 2 is further heated by the heat exchanger 22 to the superheated steam having a temperature of 130 to 200 ° C discharged from the dryer 23, which is the drying heat medium circulating. 400. Caro heats up to C.
• the temperature of the hot gas is lowered to 300 to 350 ° C. by this heat exchange, and merges with the exhaust gas from the suspension preheater 2 through the exhaust duct 12.
• the heat transfer area of the heat exchanger 22 may be increased.
• the structure of the heat exchanger 22 is preferably a multi-tube heat exchanger, a plate heat exchanger, or the like.
• the high-temperature gas whose temperature has decreased due to heat exchange in the heat exchanger 22 is introduced into the exhaust duct 12 of the suspension preheater 2 and merges with the exhaust gas from the suspension preheater 2.
• the exhaust gas temperature after heat exchange that is sufficient for heat exchange in the heat exchanger 22 is higher by 150 ° C or more than the exhaust gas temperature of the suspension preheater 2, the exhaust gas temperature rises after the merge.
• the suction gas temperature of the suction fan (IDF) 9 increases, there is no room for improvement in the firing capacity of the cement clinker 1 of the cement firing equipment. There is a risk that the sensible heat loss of the extracted hot gas will increase, and the calorific value will deteriorate.
• the temperature of the high-temperature gas extracted from the gas outlet of the second-stage cyclone 2b (550 to 6500 ° C) force heat exchange is a maximum of 100 from the exhaust gas temperature of the suspension preheater 2 (about 350 ° C). If the temperature drops to below 150 ° C (upper limit 450-500 ° C), the gas temperature after merging will be lower than before extraction. Further, by extracting the high-temperature gas, the pressure loss due to the gas passing through the uppermost cyclone 2a is also reduced. Therefore, the suction force of the suction fan (IDF) 9 is further increased, and the cement cleansing ability is increased. It can be improved.
• IDF suction force of the suction fan
• the high water content organic sludge supplied to the dryer 23 by the organic sludge supply line 30 has a boiling point of water or its boiling point by superheated steam circulating between the dryer 23 and the superheated steam line 28. It becomes a dry organic sludge which is heated to the vicinity and has a reduced moisture content.
• the temperature of the organic sludge during heating is 100 ° C.
• Dried organic sludge with a moisture content of 5 to 10% can be easily obtained in a constant-rate dry state while maintaining a temperature of about C, so that it is excessively high as a heating medium for the drying unit, and superheated steam at a temperature is required Dena,
• the dry sludge burned in the cement burning equipment can fulfill its performance as a fuel even at a moisture content of 5 to 10%.
• the feature of this embodiment is that the temperature of the hot gas after heat exchange in the heat exchanger 22 that does not require the temperature of the heat medium of the drying device to be excessively high can be reduced. It is in the point. In other words, it is easy to lower the temperature of the hot gas below the exhaust gas temperature of the suspension preheater 2, and the temperature after the exhaust gas of the suspension preheater 2 and this gas are combined decreases, and the suction fan (IDF) 9 It is possible to increase the gas flow rate.
• IDF suction fan
• an air dryer As the dryer 23, an air dryer, a fluidized bed dryer, or the like can be used. It is possible to control the drying degree relatively easily with less dust contained in the exhaust gas after drying. A material transfer type hot air type multi-stage dryer is preferred.
• the dried organic sludge obtained without fear of affecting the operation of the cement firing facility is used as the calcining furnace of the cement firing facility. It can be used effectively as a third fuel.
• the superheated steam after drying is again heat-exchanged with exhaust gas and recycled for drying organic sludge, the superheated steam can be reused efficiently and effectively.
• the sensible heat of the high-temperature gas extracted from the suspension preheater 2 of the cement firing facility can be effectively used for the operation of the cement firing facility. It can improve the burning capacity of cement cleansing power of cement burning equipment that has no risk of influence.
• the superheated steam after drying is exchanged with high-temperature exhaust gas again and recycled for drying organic sludge, the superheated steam can be reused efficiently and effectively.
• the location where the temperature is 800 ° C or higher in the cement firing equipment differs depending on the form of the cement firing equipment, and the upper limit temperature is not particularly limited, but it is usually 1600 ° C in the hottest part. It has become. Therefore, the superheated steam may be introduced directly into the cement burning facility at a temperature range of 800 to 1600 ° C.
• the superheated steam may be recovered as moisture by cooling it with a condenser or the like, and the recovered moisture is included. It can be used as wastewater treatment to decompose odor components, etc., and again to be used in cement production facilities.
• FIG. 2 is a schematic view showing a cement burning facility provided with an organic sludge treatment apparatus according to the second embodiment of the present invention.
• This organic sludge treatment apparatus 41 is used to treat organic sludge according to the first embodiment.
• the difference from the device 21 is that the hot gas bleed duct 26 and the exhaust duct 27 are replaced with the hot gas bleed line 42 and the hot gas exhaust line 43, and the hot gas used for drying of the dryer 23 is the suction fan of the suspension preheater 2.
• (IDF) 9 This is the point where the exhaust duct 12 force downstream of 9 and the hot exhaust gas branched off.
• high-temperature exhaust gas serving as a heat source for drying is branched from the exhaust duct 12 of the suspension preheater 2 and sent to the heat exchanger 22 through the high-temperature gas extraction line 42.
• This exhaust gas contains almost no chlorine gas, SO and other volatile components volatilized in the high-temperature part of the cement firing equipment, and the dust content is relatively low, so it is sent to the heat exchanger 22. It is not necessary to remove these components before they are used.
• the exhaust gas from the suspension preheater 2 is introduced into the heat exchanger 22 at a temperature of about 350 to 400 ° C, cooled to about 200 ° C after heat exchange with the superheated steam, and then deodorized by the deodorizer 24. As with some of the superheated steam that has been decomposed and removed, it is recombined with the exhaust gas from the suspension preheater 2 in the exhaust duct 12 of the suspension preheater 2.
• the high-temperature gas used for drying of the dryer 23 is suspended. Since it is a high-temperature exhaust gas branched from the exhaust duct 12 downstream of the suction fan (IDF) 9 of the pension preheater 2, it can be introduced at the same position after heat exchange and temperature drop. Also, since the superheated steam generated by drying organic sludge is deodorized and then introduced into the exhaust duct 12, the cement firing facility has no effect on gas ventilation in the cement firing facility. The power S can be used to treat organic sludge without affecting operations.
• IDF suction fan

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• Engineering & Computer Science (AREA)
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• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Organic Chemistry (AREA)
• Ceramic Engineering (AREA)
• Sustainable Development (AREA)
• Hydrology & Water Resources (AREA)
• Environmental & Geological Engineering (AREA)
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• 2006
  • 2006-11-06 JP JP2006300605A patent/JP4987428B2/ja active Active
• 2007
  • 2007-11-06 US US12/513,417 patent/US20100058963A1/en not_active Abandoned
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  • 2007-11-06 CN CN2007800401039A patent/CN101528614B/zh active Active
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