JP2010116672A - Asphalt plant utilizing heat generated in biomass power generation facilities and aggregate heating and drying method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an asphalt plant capable of effectively utilizing high quantity of heat held by high-temperature combustion gas generated when generating power in biomass power generation facilities and of reducing the amount of exhaust CO<SB>2</SB>in the asphalt plant. <P>SOLUTION: The biomass power generation facilities 1 for generating power by utilizing the combustion gas generated by burning flammable gas generated by thermally decomposing biomass in a gasification furnace and having high temperature and the asphalt plant 28 provided with an aggregate heating preliminary facilities 27 for heating aggregate preliminarily and supplying it to manufacture an asphalt mixture are installed together. While the asphalt plant 28 operates, the combustion gas generated in the biomass power generation facilities 1 and having high temperature and clean air exchange heat between them to heat the clean air, the clean air having high temperature is supplied into a dryer 47 in the aggregate heating preliminary facilities 27 in the asphalt plant to heat and dry aggregate preliminarily. The clean air having high temperature can be also supplied into a burner 33 of a dryer 29 in the asphalt plant 28. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an asphalt plant that uses heat generated in a biomass power generation facility in the biomass power generation field and the asphalt plant field, and an aggregate heating drying method.

  Recently, woody biomass such as waste wood and thinned wood is crushed and pulverized to an appropriate size, and then thermally decomposed in an oxygen-free or low-oxygen state in an indirect heating gasifier. It generates flammable gas and carbide containing methane and methane, burns the generated flammable gas, and supplies the high-temperature combustion gas generated at that time to the power generation boiler to drive the steam turbine to generate power Such a biomass power generation facility is being put into practical use, and it has been proposed to effectively use energy generated in the biomass power generation facility as disclosed in JP-A-2004-339360.

Also in asphalt plant, CO ₂ emissions of the asphalt plant when estimated from intensity of the asphalt mixture production, about 25 kg-CO ₂ / ton fuel, about 5 kg-CO ₂ / ton power, the fuel CO ₂ emissions account for the majority, and suppression of CO ₂ emissions to prevent global warming is a proposition.

Therefore, the present inventors use the high-temperature combustion gas generated from the biomass power generation facility as disclosed in Japanese Patent Application Laid-Open No. 2007-321520 to heat the combustion air of the burner of the asphalt plant, thereby reducing the fuel consumption of the burner. It proposes a method of using heat generated in a biomass power generation facility that reduces CO ₂ emissions.
JP 2004-339360 A JP 2007-321520 A

However, it has been a challenge to further effectively utilize the high amount of heat possessed by the high-temperature combustion gas generated when generating power at the biomass power generation facility, and to reduce CO ₂ emissions in the asphalt plant.

  In order to solve the above-described problems, the present invention provides an asphalt plant using heat generated in a biomass power generation facility according to claim 1, wherein thermal biomass generated in the biomass power generation facility is Biomass power generation facility that generates power using high-temperature combustion gas generated by burning combustible gas generated by pyrolysis in a gasification furnace, and aggregate heating preliminary facility that preheats and dries aggregate An asphalt plant that produces the asphalt mixture provided is also installed, heat is exchanged between the high-temperature combustion gas generated at the biomass power generation facility and clean air to heat the clean air, and the high-temperature clean air is supplied to the asphalt plant. It is characterized in that the aggregate is preliminarily heated and dried by being supplied to the dryer of the aggregate heating preliminary equipment.

  Moreover, the asphalt plant using the heat generated in the biomass power generation facility according to claim 2 heats the clean air by exchanging heat between the high-temperature combustion gas generated in the biomass power generation facility and clean air. The clean air thus obtained is connected by piping so as to be supplied to the burner of the dryer of the asphalt plant as combustion air.

  Moreover, the aggregate heating drying method of the asphalt plant using the heat which generate | occur | produces in the biomass power generation facility of Claim 3 is produced by burning the combustible gas produced | generated by thermally decomposing biomass in a gasification furnace. A biomass power generation facility that generates electricity using high-temperature combustion gas and an asphalt plant that produces an asphalt mixture equipped with an aggregate heating preparatory facility that preheats and dry aggregates are generated at the biomass power generation facility. Heat is exchanged between the high-temperature combustion gas and clean air to heat the clean air, and the high-temperature clean air is supplied to the aggregate heating preparatory dryer of the asphalt plant to preheat and dry the aggregate The product is then supplied to the dryer of the asphalt plant.

  Furthermore, the aggregate heating and drying method of the asphalt plant using the heat generated in the biomass power generation facility according to claim 4, the carbide generated in the gasification furnace is burned during the operation of the asphalt plant, Combustion gas is generated, and this combustion gas is combined with the combustion gas generated by combustion of the combustible gas generated in the gasification furnace to increase the amount of heat held by the combustion gas, and heat exchange of this combustion gas with clean air The aggregate is preliminarily heated and dried using high temperature clean air.

The asphalt plant using the heat generated in the biomass power generation facility according to claim 1 of the present invention is a combustible gas generated by pyrolyzing the thermal biomass generated in the biomass power generation facility in a gasifier. A biomass power generation facility that generates power using high-temperature combustion gas generated by combustion, and an asphalt plant that manufactures an asphalt mixture with aggregate heating preliminary equipment that preheats and supplies aggregate, Heat is exchanged between the high-temperature combustion gas generated in the biomass power generation facility and the clean air to heat the clean air, and the high-temperature clean air is supplied to the aggregate heating spare equipment dryer in the asphalt plant. Of the asphalt plant using the high-temperature combustion gas generated in the biomass power generation facility. The aggregate can be preliminarily heated and dried at wood heating spare equipment dryer, it is possible to reduce the CO ₂ by reduce the fuel consumption of the aggregate heat.

Moreover, the asphalt plant using the heat generated in the biomass power generation facility according to claim 2 heats the clean air by exchanging heat between the high-temperature combustion gas generated in the biomass power generation facility and clean air. Preliminary heating and drying of the aggregate in the dryer of the aggregate heating preparatory equipment of the asphalt plant by connecting the pipe so that the clean air thus obtained is also supplied to the burner of the asphalt plant dryer as combustion air In addition, by supplying combustion air at a high temperature to the burner of the asphalt plant dryer, the amount of fuel used in the burner can be reduced, and CO ₂ can be reduced. During operation of the asphalt plant, either high temperature clean air is used as burner combustion air, or it is used as preliminary heat drying of the aggregate in the dryer of the aggregate heating preparatory equipment. It is also possible to select either. Furthermore, since the burner does not operate when the asphalt plant is shut down, the high-temperature clean air is supplied only to the dryer for the aggregate heating spare equipment to preheat and dry the aggregate, and this heated aggregate is stored in the aggregate. Once stored in a silo and used during the next operation of the asphalt plant, the retained heat of the high-temperature combustion gas generated at the biomass power generation facility can be effectively utilized even when the asphalt plant is stopped.

Moreover, the aggregate heating drying method of the asphalt plant using the heat generated in the biomass power generation facility according to claim 3 was generated by pyrolyzing the thermal biomass generated in the biomass power generation facility in a gasification furnace. An asphalt plant that produces an asphalt mixture with a biomass power generation facility that generates power using high-temperature combustion gas generated by burning combustible gas and an aggregate heating reserve facility that preheats and supplies aggregate And heat the hot air generated in the biomass power generation facility and clean air to heat the clean air, and supply the hot clean air to the aggregate heating spare equipment dryer of the asphalt plant Then, the aggregate is preheated and dried, and then supplied to the asphalt plant dryer. Utilizing the gas can be pre-heated drying aggregate at aggregate heating spare equipment dryer asphalt plant, it is possible to reduce the CO ₂ by reduce the fuel consumption of the aggregate heat. In addition, even when the asphalt plant is shut down, the aggregate is preliminarily heated and dried and stored in an aggregate storage silo, so that the high-temperature combustion gas generated in the biomass power generation facility can be stored even when the asphalt plant is shut down. Can effectively use the retained heat.

Furthermore, the aggregate heating drying method of the asphalt plant using the heat generated in the biomass power generation facility according to claim 4 generates a high-temperature combustion gas by burning the carbide generated in the gasification furnace. The combustion gas is combined with the combustion gas generated by the combustion of the combustible gas generated in the gasification furnace to increase the amount of heat retained in the combustion gas, and the combustion gas is heat exchanged with clean air, resulting in a high temperature. By preliminarily heating and drying the aggregate using clean air, the aggregate can be heated stably with a margin without lowering the power generation efficiency in the biomass power generation facility. It is possible to reduce CO ₂ by reducing the amount of fuel used for heating.

  The asphalt plant using the heat generated in the biomass power generation facility and the aggregate heating and drying method of the present invention burn the combustible gas generated by pyrolyzing the thermal biomass generated in the biomass power generation facility in a gasifier. The biomass power generation facility is equipped with a biomass power generation facility that generates electricity using the high-temperature combustion gas that is generated and an asphalt plant that produces an asphalt mixture with an aggregate heating preparatory facility that preheats the aggregate. The high-temperature combustion gas generated and the clean air are heat-exchanged to heat the clean air, and the high-temperature clean air is supplied to the aggregate heating spare equipment dryer of the asphalt plant to preliminarily It is characterized by heat drying.

  As shown in FIG. 1, a biomass power generation facility 1 that generates power using biomass, for example, a biomass storage hopper 2 for collecting and temporarily storing woody biomass such as waste wood and thinned wood. , A crusher 3 for crushing the biomass into chips that are easy to handle is disposed downstream of the biomass storage hopper 2, and the biomass crushed into chips at the downstream of the crusher 3 is oxygen-free or A gasification furnace 4 is provided that generates a combustible gas and a carbide by pyrolysis in a low oxygen state. The gasification furnace 4 has an indirect heating kiln structure, and includes an outer cylinder 5 and a cylindrical inner cylinder 6 penetrated into the outer cylinder 5. The outer cylinder 5 is fixed to a base 7, and the inner cylinder 6 is rotatably supported on the base 7 so as to be rotated at a predetermined speed by a driving device (not shown).

  High temperature hot air of about 1100 ° C. generated in a gas combustion chamber 10 to be described later is fed into the outer cylinder 5, discharged from the crusher 3, and sequentially into the inner cylinder 6 via the screw conveyor 8. The biomass to be input is indirectly heated in an oxygen-free or low-oxygen state and thermally decomposed to produce a combustible gas and a carbide rich in hydrogen, methane, carbon monoxide, and the like.

  Dust contained in the combustible gas generated in the gasification furnace 4 is dust-removed by the cyclone 9, and the combustible gas subjected to the dust-removing treatment is burned downstream of the cyclone 9 to generate high-temperature combustion gas of about 1100 ° C. A gas combustion chamber 10 to be generated is disposed. The carbide generated in the gasification furnace 4 is pulverized by a pulverizer 11, and a carbide storage hopper 12 for storing the pulverized carbide is provided downstream of the pulverizer 11, and the downstream of the carbide storage hopper 12 is disposed. A carbide combustion chamber 13 for generating a high-temperature combustion gas of about 1100 ° C., which is the same as the case where the particulate carbide discharged and supplied from the carbide storage hopper 12 is combusted and the combustible gas is combusted, is disposed. is doing.

  Then, as shown in FIG. 1, the high-temperature combustion gas generated in the gas combustion chamber 10 and the carbide combustion chamber 13 is once combined through the combustion gas supply duct 15 and then supplied to the power generation boiler 14. Is provided with a steam turbine 16 that generates high-temperature steam by using the retained heat and generates electric power by being driven by the high-temperature steam.

  The exhaust gas discharged from the power generation boiler 14 is led out by an exhaust duct 17, and in the middle, a temperature reducing tower 18 for reducing the exhaust gas temperature, a bag filter 19 for removing dust in the exhaust gas, and the exhaust gas. Various types such as a smoke washing tower 20 for removing dust such as ash and tar in exhaust gas by spraying water, and a denitration reaction tower 21 for removing nitrogen oxides in exhaust gas by spraying ammonia on the exhaust gas. An exhaust gas treatment device is interposed, exhaust gas is sucked by an exhaust fan 22 provided on the end side of the exhaust duct 17, cleaned through the various exhaust gas treatment devices, and then discharged from the chimney 23 to the atmosphere. Yes.

  Further, in the middle of the combustion gas supply duct 15 for supplying the combustion gas to the power generation boiler 14, a part of the combustion gas flowing down in the combustion gas supply duct 15 is shunted as shown in FIG. A combustion gas circulation duct 24 for supplying the combustion gas exhausted from the outer cylinder 5 as a heat source to the gas combustion chamber 10 and circulating it again to the gas combustion chamber 10 is connected by piping so as to generate high-temperature combustion gas for power generation. Is used as a heat source for thermal decomposition of biomass in the gasification furnace 4 without waste.

  Further, a combustion gas branch duct 25 is connected in the middle of the combustion gas supply duct 15, and high-temperature combustion gas flowing into the combustion gas branch duct 25 side in the middle of the combustion gas branch duct 25 and clean air (outside air) at normal temperature. And the other end of the combustion gas branch duct 25 is connected to an exhaust duct 17 on the downstream side of the power generation boiler 14. In addition, the combustion gas whose temperature has decreased due to heat exchange is combined with the exhaust gas discharged from the power generation boiler 14 for processing.

  In the vicinity of the biomass power generation facility 1, an asphalt plant 28 for producing an asphalt mixture equipped with an aggregate heating preliminary facility 27 is provided. The asphalt plant 28 is provided with a dryer 29 for heating the supplied aggregate, and a cylindrical drum 30 having a large number of scraping blades (not shown) around the inner periphery is rotated on a base 31. The drum 30 is freely tilted and rotated at a predetermined speed by a driving device (not shown), and hot air is fed into the drum 30 from a burner 33 disposed on the hot hopper 32 at one end of the drum 30, while the other end The exhaust gas is sucked by an exhaust fan disposed at the end of an exhaust flue (not shown) connected to the cold hopper 34 of the section to maintain a high-temperature gas flow passing through the drum 30 and cleaned through a dust collector The exhaust gas is discharged from the chimney into the atmosphere.

  Then, a predetermined amount of aggregate is discharged from the aggregate hopper group 35 storing the aggregate according to particle size, the discharged aggregate is fed into the drum 30 via the belt conveyor 36, and the drum is being scraped up with a scraping blade. The gas is brought into contact with a high-temperature gas flow while being tumbled down in the interior 30, heated to a desired temperature, and discharged from a discharge portion disposed in the hot hopper 32.

  The heated aggregate discharged from the drum 30 is lifted up to the upper part of the plant main body 38 by a bucket elevator 37 which is a vertical conveying device, slides down the discharge chute and flows into the vibration sieve 39, and is classified according to the particle size and aggregated in the aggregate storage bin 40. Stored in each compartment. The aggregate storage bin 40 is provided with a discharge gate for discharging aggregate at the lower end of each compartment, and an aggregate measuring tank 41 supported by a weight detector is disposed below the aggregate gate, and a stone powder storage bin 42 is provided. A stone powder metering tank 44 for metering stone powder supplied by the screw feeder 43 and an asphalt metering tank 45 for metering asphalt are arranged, and a mixer 46 is arranged at a lower level, and a predetermined amount of each material is added to the above. It measures in each measuring tank, mixes and adjusts with the mixer 46, manufactures a desired asphalt mixture, and it is made to convey with a truck | truck etc.

  On the other hand, the aggregate heating preliminary equipment 27 is installed near the aggregate 29 of the dryer 29 for heating the aggregate of the asphalt plant 28 and preheated and dried as shown in FIG. Equipment such as an aggregate storage silo 48 is provided. The preheating and drying dryer 47 has substantially the same structure as that of the above-described dryer 29, and is rotatably supported by a tilt and rotated at a predetermined speed by a driving device (not shown). While supplying high-temperature clean air, which will be described later, from one end side, the aggregate stored in the aggregate hopper 51 is supplied into the drum 52 via the belt conveyor 50 installed on the other end side of the preheating dryer 47, The aggregate is heated and dried while passing through the drum 52 and preliminarily heated to an appropriate temperature. In the aggregate hopper 51, sand having a relatively high moisture content in the aggregate is stored, and it is efficient to preheat and dry the sand with a dryer 47, and the heated sand is asphalted. When the dryer 29 of the plant 28 is mixed with other aggregates and heated to a predetermined temperature of around 160 ° C., the aggregate is heated to a target temperature accurately and stably by preheating the sand. This is preferable.

  The aggregate heated by the preheating and drying dryer 47 is lifted by the bucket elevator 53 and temporarily stored in the aggregate storage silo 48. The aggregate storage silo 48 has a heat insulation structure as necessary. The aggregate discharged from the aggregate storage silo 48 is supplied to the dryer 29 of the asphalt plant 28 in an arbitrary amount by a conveying device 54 such as a conveyor.

  In this way, the high temperature disposed in the heat exchanger 26 of the biomass power generation facility 1 as shown in FIG. 1 in the dryers 47 of the aggregate heating preliminary equipment 27 and the dryer 29 of the asphalt plant 28 adjacent to the biomass power generation facility 1. The end of the air supply duct 55 is branched into a bifurcated shape, and the hot air duct 56 for preheating and the hot air duct 57 for the burner 29 of the asphalt plant 28 are connected by piping, and the temperature becomes high via the heat exchanger 26. The clean air is supplied, and the aggregate is preliminarily heated and dried by the dryer 47 of the aggregate heating preparatory equipment 27, or used as the combustion air of the burner 33 of the dryer 29 of the asphalt plant 28. In the high-temperature air supply duct 55, a normal temperature clean air (outside air) taken in from the outside by an air supply fan 58 and a high-temperature combustion gas of about 1100 ° C. flowing down in the combustion gas branch duct 25 are heat exchangers. 26, heat is exchanged, and clean air is heated to about 500 to 600 ° C. and supplied.

  As shown in FIG. 1, dampers 59 and 60 and blowers 61 and 62 are provided in the preheating hot air duct 56 and the burner hot air duct 57, respectively, and the damper 59 is opened as appropriate. High temperature clean air is supplied only to the dryer 47 of the aggregate heating preparatory equipment 27, only the damper 60 is opened as appropriate, and supplied only to the burner 33 of the dryer 29 of the asphalt plant 28, or the dampers 59, 60 Both of these can be opened as appropriate and supplied to both the aggregate heating preliminary equipment 27 and the burner 33 of the dryer 29 of the asphalt plant 28. The temperature sensors 63 and 64 are arranged to measure the temperature of the hot clean air, and the opening amounts of the dampers 59 and 60 are adjusted so that the burner 33 of the dryer 47 of the aggregate heating preparatory equipment 27 and the dryer 29 of the asphalt plant 28. It is also possible to control the temperature of the hot clean air that leads to

  In the burner 33 of the dryer 29 of the asphalt plant 28, the high-temperature clean air supplied is used as combustion air, so that combustion can be performed in a state where the amount of fuel used is suppressed compared to the normal time. At this time, the burner 33 performs combustion by raising the air ratio slightly higher than normal, for example, by raising the air ratio, which is normally about 1.3, to about 1.7 to 1.8 (more preferably 1.77). By controlling in this manner, the amount of heat retained by the high-temperature combustion air can be used effectively, and the amount of fuel used by the burner 33 can be further suppressed.

  Further, the hot air duct 57 for the burner is provided with an open / close opening 65 for allowing outside air to be introduced into the duct so that it can be opened and closed, for example, when the biomass power generation facility 1 side is opened when the operation is stopped or immediately after the start of operation. For example, when a sufficient amount of combustion air cannot be sent, outside air is appropriately introduced into the duct from the outside air introduction port 65, and the amount of combustion air supplied to the burner 32 of the asphalt plant 27 can be secured stably. Is dealt with.

  Reference numeral 66 denotes an emergency discharge port for urgently discharging the combustion air flowing down in the hot air duct 57 for the burner to the outside. For example, when the operation of the asphalt plant 28 is stopped during combustion air supply and the combustion of the burner 33 is stopped while the combustion air is being supplied, the combustion air pressure is lost due to the loss of the place of combustion. Since a load may be applied to the power generation boiler 14, the shut-off damper 67 is opened in such a case so that the combustion air in the duct can be discharged urgently.

In this way, high-temperature combustion gas generated by burning the combustible gas generated by pyrolyzing the thermal biomass generated in the biomass power generation facility 1 by the gasification furnace 4 and the clean air are heat-exchanged to obtain clean air. The fuel is used to heat the aggregate by supplying the heated clean air to the dryer 47 of the aggregate heating preliminary equipment 27 of the asphalt plant 28 and preliminarily heating and drying the aggregate. The amount can be reduced to reduce CO ₂ .

Further, the high-temperature combustion gas generated in the biomass power generation facility 1 and the clean air are heat-exchanged to heat the clean air, and the high-temperature clean air is also supplied to the burner 33 of the dryer 29 of the asphalt plant 28 for combustion. As a result, not only the preliminary heating and drying of the aggregate of the dryer 47 of the aggregate heating preparatory equipment 27 but also the combustion air of the burner 33 can be used to reduce the amount of fuel used for heating the aggregate. Further reduction can be achieved to reduce CO ₂ .

  FIG. 1 shows an embodiment of the present invention. As described above, the biomass power generation facility 1 that generates power using biomass has a crusher that arranges a woody biomass storage hopper 2 such as waste wood and thinned wood and crushes it downstream as shown in FIG. 3 is provided, and an indirect heating kiln-structured gasification furnace 4 is disposed in which the biomass crushed into chips is pyrolyzed in an oxygen-free or low-oxygen state to generate combustible gas and carbide. In order to produce the combustible gas and carbide containing abundant hydrogen, methane, carbon monoxide, etc., by indirectly heating the biomass that is sequentially added in an oxygen-free or low-oxygen state and thermally decomposing it. Yes.

  Dust contained in the combustible gas generated in the gasification furnace 4 is dust-removed by the cyclone 9, and the combustible gas dust-removed downstream of the cyclone 9 is combusted in the gas combustion chamber 10 to about 1100 ° C. A high-temperature combustion gas is generated, and a carbide storage hopper 12 is provided for storing carbide generated in the gasification furnace 4 in a pulverizer 9 and storing the pulverized carbide downstream of the pulverizer 11. In the downstream of the carbide storage hopper 12, the high-temperature combustion gas of about 1100 ° C., which is the same as the case where the particulate carbide discharged and supplied from the carbide storage hopper 12 is combusted and the combustible gas is combusted. Is generated in the carbide combustion chamber 13.

  Further, as shown in FIG. 1, the high-temperature combustion gas generated in the gas combustion chamber 10 and the carbide combustion chamber 13 is once combined with the power generation boiler 14 through the combustion gas supply duct 15 and then supplied to the power generation boiler 14. In the middle of the combustion gas supply duct 15 for generating a high-temperature steam using the retained heat, driving the steam turbine 16 with this high-temperature steam to generate power, and supplying the combustion gas to the power generation boiler 14 As shown in FIG. 1, a part of the combustion gas flowing down in the combustion gas supply duct 15 is divided and supplied as a heat source into the outer cylinder 5 of the gasification furnace 4 and exhausted from the outer cylinder 5. Is connected to the gas combustion chamber 10 for circulation, and a part of the high-temperature combustion gas for power generation is used as a heat source for thermal decomposition of biomass in the gasification furnace 4 without waste. It is.

  A combustion gas branch duct 25 is connected in the middle of the combustion gas supply duct 15, and high-temperature combustion gas flowing into the combustion gas branch duct 25 side in the middle of the combustion gas branch duct 25 and clean air at normal temperature (outside air) The heat exchanger 26 that exchanges heat with the heat exchanger 26 is disposed to heat and raise the temperature of the clean air, and the end of the high-temperature air supply duct 55 disposed in the heat exchanger 26 as shown in FIG. The preheating hot air duct 56 and the burner hot air duct 57 are connected by piping, and the dryer 47 and the asphalt plant 28 of the aggregate heating preparatory equipment 27 are connected via the preheating hot air duct 56 and the burner hot air duct 57. The dryer 29 is supplied with high-temperature clean air to the burner 33, the aggregate is heated by the dryer 47 of the aggregate heating preliminary equipment 27, and the dryer 29 of the asphalt plant 28 is heated. It is used as combustion air at 33.

In the high-temperature air supply duct 55, a normal temperature clean air (outside air) taken in from the outside by an air supply fan 58 and a high-temperature combustion gas of about 1100 ° C. flowing down in the combustion gas branch duct 25 are heat exchangers. The heat is exchanged by H. 26, and the temperature of the clean air is raised to about 500 to 600 ° C., and then supplied to the hot air duct 56 for preliminary drying and the hot air duct 57 for burner. In the burner 33, the high-temperature clean air supplied is used as combustion air, so that combustion can be performed in a state where the amount of fuel used is suppressed compared to the normal time. At this time, the burner 33 performs combustion by raising the air ratio slightly higher than normal, for example, by raising the air ratio, which is normally about 1.3, to about 1.7 to 1.8 (more preferably 1.77). By controlling in this way, the amount of heat retained by the high-temperature combustion air can be used effectively, and the amount of fuel used by the burner 33 can be further suppressed.

  Therefore, when the asphalt plant 28 is not in operation, the biomass in the gasification furnace 4 of the biomass power generation facility 1 is thermally decomposed by indirect heating in an oxygen-free or low-oxygen state to enrich hydrogen, methane, and the like. The combustible gas and carbide contained therein are generated, and the generated combustible gas is combusted in the gas combustion chamber 10, and all the high-temperature combustion gas generated at that time is supplied to the power generation boiler 14, and the generated high-temperature steam is generated. The steam turbine 16 is driven to generate electric power, and the generated carbide is sequentially pulverized by the pulverizer 11 and then stored in the carbide storage hopper 12 without being combusted.

  Then, when the asphalt plant 28 is in an operating state, the carbides stored in the carbide storage hopper 12 until then are quantitatively supplied to the carbide combustion chamber 13 for combustion, and the high-temperature combustion gas generated at that time is combusted with combustible gas. By combining with the generated combustion gas, the total amount of combustion gas is increased to sufficiently increase the amount of heat held by the combustion gas, and the amount of combustion gas corresponding to the amount of combustion gas generated by combustion of combustible gas among the increased amount of gas The amount of combustion gas required for power generation is supplied to the power generation boiler 14 and stably used for power generation, while the amount corresponding to the amount of combustion gas generated by combustion of carbides, that is, excess combustion gas for power generation The quantity is led to the combustion gas branch duct 25 side, and this high-temperature combustion gas and normal-temperature clean air (outside air) are heat-exchanged by the heat exchanger 26 to heat and raise the temperature of the clean air. High temperature clean air is supplied to the dryer 47 of the aggregate heating preparatory equipment 27 via the high temperature air supply duct 55 and the preheating hot air duct 56 (the damper 61 is open and the damper 60 is closed). Preheat. After the heated aggregate is temporarily stored in the aggregate storage silo 48, an arbitrary amount is supplied to the dryer 29 of the asphalt plant 28 by the transport device 54, and at the same time, the aggregate shortage is appropriately amounted from the aggregate hopper group 35. It is discharged and supplied to the dryer 29 via the belt conveyor 36, and is heated to a predetermined temperature of about 160 ° C. including the preheated aggregate.

Further, if necessary, the heat generated in the biomass power generation facility 1 is heated to clean air, and the heated clean air is heated to the burner 33 of the dryer 29 of the asphalt plant 28 through the hot air duct 57 for the burner by opening the damper 60. Also supplied as combustion air. As a result, not only the preliminary heating and drying of the aggregate of the dryer 47 of the aggregate heating preparatory equipment 27 but also the combustion air of the burner 33 of the dryer 29 of the asphalt plant 28 is used. Can be reduced to reduce CO ₂ .

  Even when the asphalt plant 28 is not in operation, high temperature clean air is supplied to the dryer 47 of the aggregate heating preparatory equipment 27 to preheat and dry the aggregate and temporarily store it in the aggregate storage silo 48. The aggregate can be discharged from the aggregate storage silo 48 and supplied to the dryer 29 of the asphalt plant 28 during the next operation of the asphalt plant 28.

The aggregate of the asphalt plant 28 using the high-temperature combustion gas generated by burning the combustible gas generated by pyrolyzing the thermal biomass generated in the biomass power generation facility 1 in the gasification furnace 4 in this way. The aggregate can be preliminarily heated and dried by supplying it to the dryer 47 of the heating preparatory facility 27, and the amount of fuel used for heating the aggregate can be reduced to reduce CO ₂ .

  In the embodiment, high-temperature clean air is supplied to both the dryer 47 of the aggregate heating preliminary equipment 27 and the burner 33 of the dryer 29 of the asphalt plant 28 via the hot air duct 56 for preheating and the hot air duct 57 for burner. Although it is configured so that it can be supplied, the hot air duct 57 for the burner is not provided, only the hot air duct 56 for preheating is provided, and high temperature clean air is supplied only to the dryer 47 of the aggregate heating preparatory equipment 27. Of course you can.

It is a general | schematic explanatory drawing which shows one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Biomass power generation facility 4 ... Gasification furnace 10 ... Gas combustion chamber 26 ... Heat exchanger 27 ... Aggregate heating preliminary equipment 28 ... Asphalt plant 29 ... Dryer 33 ... Burner 55 ... High temperature air supply duct 56 ... Hot air duct for preheating 57 ... Hot air duct for burner

Claims (4)

Biomass power generation facility that generates power using high-temperature combustion gas generated by burning flammable gas generated by pyrolyzing biomass in a gasification furnace, and aggregate that supplies aggregate by preheating An asphalt plant that produces asphalt mixture with heating preparatory equipment is installed,
Heat is exchanged between the high-temperature combustion gas generated in the biomass power generation facility and the clean air to heat the clean air, and the high-temperature clean air is supplied to the aggregate heating spare equipment dryer in the asphalt plant. An asphalt plant using heat generated in a biomass power generation facility, characterized in that it is preliminarily heated and dried.   Heat is exchanged between the high-temperature combustion gas generated at the biomass power generation facility and clean air to heat the clean air, and the high-temperature clean air is supplied to the burner of the asphalt plant dryer as combustion air. The asphalt plant using heat generated in the biomass power generation facility according to claim 1, wherein piping is connected. Biomass power generation facility that generates electricity using high-temperature combustion gas generated by burning combustible gas generated by pyrolyzing biomass in a gasification furnace, and aggregate heating reserve that preheats and drys the aggregate An asphalt plant that produces asphalt mixture with equipment is installed,
Heat is exchanged between the high-temperature combustion gas generated in the biomass power generation facility and the clean air to heat the clean air, and the high-temperature clean air is supplied to the aggregate heating spare equipment dryer in the asphalt plant. A method for heating and drying an aggregate of an asphalt plant using heat generated in a biomass power generation facility, which is preliminarily heated and dried and supplied to an asphalt plant dryer.   Carbide generated in the gasification furnace is burned to generate high-temperature combustion gas, and this combustion gas is combined with the combustion gas generated by the combustion of the combustible gas generated in the gasification furnace to hold the combustion gas. 4. The biomass according to claim 3, wherein the amount of heat is increased, heat is exchanged between the combustion gas and clean air, and the aggregate is preliminarily heated and dried using high temperature clean air. Aggregate heating drying method of asphalt plant using heat generated in power generation facilities.

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