JP6558687B2 - Combustion device for log fuel, boiler system for log fuel, combustion gas supply method using log fuel, and in-region power supply system using log fuel - Google Patents

Description

  The present invention relates to a combustion apparatus for log fuel, a boiler system for log fuel, a method for supplying combustion gas using log fuel, and an in-region power supply system using log fuel.

  In order to make effective use of forest resources, a system that uses wood biomass fuel such as wood pellets and wood chips, burns them in a dedicated furnace, supplies combustion gas, and generates power has been proposed (patent) Reference 1 etc.). The woody biomass fuel is obtained by drying, pulverizing, etc. the raw tree after cutting.

JP2013-210123A

  In the above-described conventional system, secondary processing for drying, pulverizing, and the like is necessary to obtain a woody biomass fuel to be burned in the furnace. Therefore, in order to obtain a woody biomass fuel, a processing dedicated machine and additional energy are required. In addition, it takes time to dry the raw trees after cutting. As a result, the procurement cost of woody biomass fuel is high.

  Moreover, the above-described conventional system is a system in which woody biomass fuel in the form of pellets or chips is supplied into a dedicated furnace and burned in the furnace. Therefore, a large furnace is required to burn a large amount of woody biomass fuel, and the initial investment becomes high.

  For these reasons, the conventional system described above has not been introduced, and it has been difficult to effectively use forest resources.

An object of the present invention is to provide, reduce the procurement cost of fuel, while reducing the cost of capital investment, Ru near possible to obtain a stable energy by utilizing the forest resources.

  In order to solve the above problems, a combustion apparatus for log fuel according to one aspect of the present invention includes a combustion furnace, a carry-in mechanism for carrying log fuel into the combustion furnace, and a combustion gas generated in the combustion furnace. And an air supply path to be supplied to the outside. The log fuel is a fuel composed of wood that has not been dried. The carry-in mechanism is a mechanism for carrying in the log fuel intermittently.

  In order to solve the above problems, a boiler system using a log fuel according to an aspect of the present invention uses the above-described combustion apparatus for log fuel and the combustion gas supplied through the supply passage. And a boiler for generating steam or hot water.

  In order to solve the above problem, a method for supplying combustion gas using a log fuel according to an aspect of the present invention is a method for supplying combustion gas using the above-described combustion apparatus for log fuel, While maintaining the atmospheric temperature in the combustion furnace at 700 ° C. to 1100 ° C., using the loading mechanism, the log fuel is intermittently carried into the combustion furnace at a predetermined interval, whereby the combustion In the furnace, the log fuel is continuously burned until complete combustion.

  In order to solve the above problem, a method for supplying combustion gas using a log fuel according to an aspect of the present invention is a method for supplying combustion gas using the above-described combustion apparatus for log fuel, Prior to the start of combustion, the first log fuel is carried into the combustion furnace, the first log fuel is ignited with kerosene, and then the atmospheric temperature in the combustion furnace is maintained at 700 ° C. to 1100 ° C. However, by intermittently carrying the log fuel into the combustion furnace, the combustion of the log fuel is continued at 24 hours / day in the combustion furnace.

  In order to solve the above problems, an in-region power supply system using log fuel according to an aspect of the present invention includes a boiler system for log fuel, and the steam or hot water generated by the boiler system. A supply path of steam or hot water supplied to at least one of the peripheral facilities in the area where the boiler system is installed, a power generation apparatus that generates power with the steam or hot water generated by the boiler system, and the power generation apparatus A power supply path for supplying the electricity generated in step 1 to at least one of the surrounding facilities.

  In order to solve the above problems, an in-region power supply system using log fuel according to one aspect of the present invention includes a boiler system for log fuel, and the steam or hot water generated by the boiler system. A power generation device that generates power, a power supply path that supplies electricity generated by the power generation device to at least one of the surrounding facilities in the area where the boiler system is installed, and waste heat generated by the power generation device, A heat supply path for supplying to at least one of the surrounding facilities.

The present invention suppresses the replacement cost of the fuel, and, at a lower cost of capital investment, an effect that as possible out to obtain a stable energy utilizing forest resources.

It is a partially broken side view showing the boiler system of one embodiment of the present invention. It is a principal part enlarged view of FIG. It is the sectional view on the AA line of FIG. It is the top view which looked at the principal part of Drawing 1 from the upper part. FIG. 5A to FIG. 5D are schematic side views sequentially showing how the log fuel is dropped. It is a top view which shows the modification of a carrying-in mechanism. It is a schematic diagram which shows the local energy supply system of one Embodiment of this invention.

  1 to 5 show a log fuel combustion apparatus according to an embodiment and a log fuel boiler system equipped with the combustion apparatus.

  The combustion apparatus of the present embodiment is an apparatus that efficiently supplies combustion gas using the log fuel L, and the boiler system of the present embodiment uses the combustion gas supplied from the combustion apparatus to supply steam or hot water. It is a supply system.

  The log fuel L is a fuel composed of timber that has not been dried. Specifically, raw wood that has been cut from forests (raw trees), timber that has been thinned for forest management, and logging This is wood left behind (forest residual material), residual material after use as architecture or general wood.

  The log fuel L may have a diameter of 5 to 50 cm and a length of 1 to 5 m, and the weight and moisture content are not particularly limited. The log fuel L may have a moisture content exceeding 50%.

  In other words, in the case of general wood biomass fuels such as wood pellets and wood chips, the wood is refined using a dedicated processing machine in the secondary processing and dried over time until the moisture content reaches 25% or less. In the case of the log fuel L, there is no need for processing.

  The combustion apparatus of this embodiment includes a combustion furnace 1 designed exclusively for burning log fuel L having a high water content, a loading mechanism 2 used for loading log fuel L into the combustion furnace 1, and a combustion furnace 1. An air supply path 3 for supplying the generated combustion gas and a control panel 6 for controlling the carry-in mechanism 2 and the like are provided.

  In addition to the combustion apparatus of the present embodiment, the boiler system of the present embodiment includes a boiler 4 to which combustion gas is supplied through the air supply path 3, and a heat exchanger that reuses the combustion gas discharged from the boiler 4. 5 and an air pollution prevention device 7 that removes pollutants in the combustion gas and discharges them into the atmosphere.

  Hereinafter, each structure with which the boiler system of this embodiment is provided is further demonstrated.

  First, the combustion apparatus of this embodiment is demonstrated based on FIG.2, FIG.3 etc. FIG.

  The combustion furnace 1 provided in the combustion apparatus of the present embodiment is a furnace designed exclusively for burning the log fuel L completely in the furnace. The combustion furnace 1 is formed in a square shape or an arch shape using refractory bricks or iron.

  The combustion furnace 1 includes a carry-in port 11 through which log fuel L can be carried into the furnace, and an exhaust port 12 through which combustion gas generated in the furnace can be discharged out of the furnace. In the combustion furnace 1, a net-like floor 13 is provided to partition the furnace up and down.

  The upper space partitioned by the floor 13 is the combustion chamber 101, and the lower space partitioned by the floor 13 is the incineration ash chamber 102. The combustion furnace 1 includes a discharge port 15 through which ash can be taken out from the incineration ash chamber 102. The carry-in port 11 is located above the floor 13 and communicates with the combustion chamber 101. The discharge port 15 is located below the floor 13 and communicates with the incineration ash chamber 102.

  The combustion furnace 1 further includes a loading opening / closing mechanism 16 that opens and closes the loading port 11 and a discharging opening / closing mechanism 17 that opens and closes the discharge port 15.

  The loading opening / closing mechanism 16 includes a heat-resistant door 161 that can close the carry-in port 11 and a cylinder 162 that moves the door 161 up and down, and seals the carry-in port 11 when the door 161 is in the lower position. Stop and open the entrance 11 when the door 161 is in the upper position.

  The discharge opening / closing mechanism 17 includes a heat-resistant door 171 that can close the discharge port 15 and a cylinder 172 that moves the door 171 in the horizontal direction. When the door 171 is in a predetermined position on the horizontal plane, The outlet 15 is sealed, and the outlet 15 is opened when the door 171 is at the second position on the horizontal plane.

  The combustion furnace 1 further includes a fan 18 for supplying air from the outside, and a supply path 19 (see FIG. 3) for supplying the air sent by the fan 18 into the furnace. The supply path 19 includes a space 191 formed between the refractory brick layer 141 and the iron outer layer 142 constituting the combustion furnace 1, and a large number of air holes 192 formed in the refractory brick layer 141. A large number of air holes 192 are formed on all wall surfaces of the refractory brick layer 141 except the ceiling in a substantially uniform arrangement with a predetermined interval. The predetermined interval is preferably within a range of 5 cm to 10 cm. Each air hole 192 is a fine hole having an opening width of about several mm.

  The refractory brick layer 141 is formed with a thickness of 40 cm or more using a large amount of refractory bricks. The combustion chamber 101 and the incineration ash chamber 102 are spaces surrounded by the refractory brick layer 141. The outer layer 142 is an iron layer formed so as to cover the refractory brick layer 141. Air is sent into the space 191 between the refractory brick layer 141 and the outer shell layer 142 from the outside by the fan 18.

  Each air hole 192 communicates with the space 191. The air sent into the space 191 is supplied into the combustion furnace 1 through a large number of air holes 192 distributed over the entire inner wall surface excluding the ceiling of the combustion furnace 1.

  Next, the carry-in mechanism 2 included in the combustion apparatus of the present embodiment will be described based on FIG. 2, FIG. 4, FIG.

  The carry-in mechanism 2 is a mechanism configured to carry the log fuel L intermittently (for example, several times per hour) while maintaining the temperature in the combustion chamber 101 of the combustion furnace 1.

  The carry-in mechanism 2 is a mechanism provided adjacent to the carry-in port 11 of the combustion furnace 1, and includes a work floor 24 on which an operator can move, and a groove portion 25 having a shape in which a part of the work floor 24 is recessed. The mounting table 21 provided on the bottom surface of the groove 25 so as to reciprocate in one direction (hereinafter referred to as “front-rear direction”), and the pressing body provided on the mounting table 21 so as to reciprocate in the front-rear direction. 231.

  As shown in FIG. 4, the groove 25 has a rectangular outer shape that is long in the front-rear direction in plan view. When the door 161 is opened, the front end of the groove 25 communicates with the carry-in port 11, and when the door 161 is closed, the groove 25 and the carry-in port 11 are blocked.

  On the work floor 24, a plurality of (two in this embodiment) rails 26 are installed at positions adjacent to the groove 25 in the left-right direction. The plurality of rails 26 are positioned in parallel at a distance in the front-rear direction, and a large number of log fuels L can be stacked on the plurality of rails 26.

  As shown in FIG. 2 and the like, the mounting table 21 includes a plurality of wheels 211 that can roll on the floor surface of the groove 25 and a connecting piece 212 that is connected to a drive mechanism 22 described later.

  The mounting table 21 is reciprocated in the front-rear direction by the drive mechanism 22. The drive mechanism 22 includes a cylinder 221 that can expand and contract in the front-rear direction, and the tip of the cylinder 221 is connected to the connection piece 212 of the mounting table 21.

  The pressing body 231 is reciprocated in the front-rear direction independently of the mounting table 21 by a drive mechanism 232 including a cylinder 2321 that is extendable in the front-rear direction. The pressing body 231 is a plate material having a thickness in the front-rear direction, and the log fuel L is pressed against the front surface of the pressing body 231.

  An extension 2311 extends rearward from the lower end edge of the pressing body 231. The extension portion 2311 is provided with a plurality of wheels 2312 that can roll on the mounting table 21.

  5A to 5D schematically show that the log fuel L is regularly dropped onto the floor 13 as the mounting table 21 and the pressing body 231 move back and forth in time.

  First, as shown in FIG. 5A, the log fuel L is set in the groove 25. The log fuel L is set in the groove 25 so that its longitudinal direction is substantially parallel to the front-rear direction. Although one or a plurality of log fuels L may be set in the groove portion 25, FIGS. 5A to 5D show only one log fuel L for the sake of simplicity.

  Next, as shown in FIG. 5B, after raising the door 161 (see arrow a1), both the mounting table 21 and the pressing body 231 are advanced toward the combustion chamber 101 of the combustion furnace 1 (see arrow a2). . When the log fuel L reaches the vicinity of the center of the combustion chamber 101, the mounting table 21 stops moving forward, and the pressing body 231 further moves forward to push the log fuel L forward (see arrow a3). The pressing body 231 stops moving forward at a position about half the front-rear direction of the mounting table 21.

  Next, as shown in FIG. 5C, the mounting table 21 is moved backward while the pressing body 231 is stopped (see arrow a4). As a result, the front end of the log fuel L is dropped to a target location on the floor 13 (see arrow a5). In the stage shown in FIG. 5C, the rear end of the log fuel L is still on the mounting table 21.

  When the mounting table 21 is further retracted from here (see arrow a6), as shown in FIG. 5D, the rear end of the log fuel L can be dropped to a target position on the floor 13 (see arrow a7). . By passing through the above-mentioned steps, the log fuel L can be regularly arranged in a predetermined posture at a central portion on the floor 13.

  When the log fuel L is completely loaded, the loading table 21 and the pressing body 231 are moved back to their original positions, and the door 161 is lowered to close the loading port 11.

  As described above, in the present embodiment, when the mounting table 21 moves backward, the pressing body 231 is pressed against the log fuel L to restrict the backward movement of the log fuel L (so as not to move). Are regularly dropped into the central portion of the floor 13. In this embodiment, the movement restricting mechanism 23 that temporarily restricts the movement of the log fuel L in the combustion furnace 1 is configured by the pressing body 231 and the drive mechanism 232 that changes the front-rear position of the pressing body 231. Yes.

  The vertical movement of the door 161, the back and forth movement of the mounting table 21, the back and forth movement of the pressing body 231 and the like are controlled by operating the control panel 6 adjacent to the combustion furnace 1, respectively. That is, when the operator operates the control panel 6, the log fuel L set in the groove 25 can be safely and regularly dropped into a target location in the combustion furnace 1.

  The air supply path 3 is a path that allows the combustion furnace 1 and the boiler 4 to communicate with each other. One end of the air supply path 3 communicates with the exhaust port 12 of the combustion furnace 1, and the other end of the air supply path 3 communicates with the boiler 4.

  Next, other configurations included in the boiler system of the present embodiment will be described in order based on FIGS.

  The boiler 4 is a device that generates steam or hot water using the combustion gas supplied through the air supply path 3. As the boiler 4, various types such as a furnace tube type, a water tube type, and the like are applicable, and those that meet the implementation conditions are carefully selected from commercially available equipment.

  The heat exchanger 5 is a device for efficiently using the high-temperature combustion gas that has passed through the boiler 4, and one that meets the implementation conditions is carefully selected from commercially available devices.

  The air pollution prevention device 7 is a device that removes pollutants contained in the combustion gas and discharges them into the atmosphere, and includes a first device 71, a second device 72, and a chimney device 73. The first device 71 removes contaminants in the combustion gas that has passed through the heat exchanger 5. The second device 72 removes contaminants that could not be removed by the first device 71. The chimney device 73 releases the gas after the contaminants are removed by the first and second devices 71 and 72 to the atmosphere. Each of the devices 71, 72, 73 is selected from commercially available devices that meet the implementation conditions.

  Next, a method for supplying steam or hot water using the boiler system having the above configuration will be described.

  First, in the stage before starting combustion in the combustion furnace 1, the first log fuel L is carried into the combustion furnace 1. Specifically, an appropriate one is selected from a number of log fuels L stacked on the rail 26, and the selected log fuel L is dropped into the groove 25 while the operator slides on the rail 26. set.

  Each rail 26 is gently inclined downward toward the groove portion 25, and the operator can hook the log fuel L using an appropriate tool such as a sharp iron rod and slide it on the rail 26.

  As in the modification shown in FIG. 6, it is also preferable to install a robot hand 27 at a location adjacent to the groove 25 and set the log fuel L in the groove 25 using the robot hand 27. In this case, the robot hand 27 is operated by the operator operating the control panel 6.

  A plurality of (for example, five) log fuels L are set in the groove 25. Hereinafter, the first log fuel L is referred to as “ignition log fuel L1”.

  When an operator operates a lever, button, or the like provided on the control panel 6, a plurality of ignition log fuels L1 are regularly dropped into the combustion furnace 1 in the steps described above with reference to FIGS. 5A to 5D. Can do. That is, by operating a predetermined lever provided on the control panel 6, the door 161 of the combustion furnace 1 is lifted to open the carry-in port 11, and the log fuel L <b> 1 for ignition together with the mounting table 21 is carried into the combustion furnace 1. When the mounting table 21 is returned to the outside of the furnace, the ignition log fuel L1 is prevented from returning by hitting the pressing body 231. Thereby, the ignition log fuel L1 can be regularly dropped into the combustion furnace 1. it can.

  After confirming that the mounting table 21 and the pressing body 231 have moved back to the outside of the furnace, the door 161 is lowered to seal the carry-in port 11.

  Thereafter, the operator operates the control panel 6, applies kerosene to the ignition log fuel L1 in the combustion furnace 1, and operates the burner for about 10 minutes to ignite the ignition log fuel L1.

  By burning the log fuel L1 for ignition in the combustion furnace 1 for a predetermined time, the atmospheric temperature in the combustion furnace 1 reaches 700 ° C. to 1100 ° C., and thereafter, while maintaining the atmospheric temperature in the combustion furnace 1 The log fuel L is intermittently carried into the combustion furnace 1.

  That is, while maintaining the atmospheric temperature in the combustion furnace 1 at 700 ° C. to 1100 ° C., the door 161 of the combustion furnace 1 is intermittently lifted to carry in the next log fuel L, and the log fuel L is regulated in the same process. The log fuel L is continuously combusted in the combustion furnace 1 by dropping it. More preferably, the atmospheric temperature in the combustion furnace 1 is maintained at 900 to 1100 ° C or at 1000 to 1100 ° C. The newly loaded log fuel L is superimposed on the burning log fuel L and burns naturally in a high-temperature atmosphere in the combustion furnace 1.

  Thereby, in the combustion furnace 1 of this embodiment, each log fuel L carried in intermittently can be burned in the combustion furnace 1 until it reaches complete combustion. The ash after complete combustion is taken out of the furnace periodically by opening the door 171.

  In the boiler system of this embodiment, the log fuel L is burned continuously in the combustion furnace 1 for 24 hours, and the combustion gas is continuously supplied to the boiler 4 for 24 hours. Therefore, the boiler 4 continues for 24 hours. Steam or hot water can be generated and supplied.

  The amount of log fuel L required to supply a predetermined amount of steam using the boiler system of the present embodiment is, for example, as shown in Table 1 below. The amount of log fuel L required varies depending on the required steam quality conditions, but in Table 1 below, it is matched to the quality of steam used in a general manufacturing plant.

  When the combustion in the combustion furnace 1 is temporarily interrupted, the supply of air into the combustion furnace 1 may be stopped. Thereby, combustion of the carbonized log fuel L is interrupted. When the combustion in the combustion furnace 1 is resumed, the supply of air into the combustion furnace 1 may be resumed.

  By the way, in the boiler system of this embodiment, as Table 1 shows, the result that steam (or warm water) can be generated with the boiler 4 with the efficiency more than the case where the dried wood biomass fuel is used is obtained. Has been obtained.

  This result is presumed to be caused by the continuous generation of a large amount of superheated steam in the combustion furnace 1 in the boiler system of the present embodiment (that is, the combustion device included therein).

  That is, the boiler system of the present embodiment does not use a low water content fuel (for example, 25% or less) like conventional woody biomass fuel, but a log fuel L having a water content of 40% to 50% or more. Is a system in which a large amount of superheated steam is generated in the combustion furnace 1 by controlling the combustion so that the temperature in the combustion furnace 1 is maintained at 700 ° C. or higher. is there.

  Superheated steam has a property of extremely high heat transfer compared to hot air at the same temperature. Therefore, by continuously supplying a combustion gas containing a large amount of superheated steam from the combustion furnace 1 to the boiler 4, the boiler is heated. It is surmised that the efficiency of No. 4 has improved and a large amount of steam has been generated from the boiler 4.

  In the boiler system of the present embodiment, air is uniformly supplied into the combustion furnace 1 and the temperature in the combustion furnace 1 is maintained at 700 ° C. or higher (preferably 900 ° C. or higher). The log fuel L is completely burned while generating a large amount of superheated steam using moisture.

  As described above, the air sent by the air supply fan 18 is once sent to the space 191 between the refractory brick layer 141 and the iron outer layer 142, and is heated in this space 191. The air heated to a high temperature in the space 191 is uniformly supplied into the combustion furnace 1 through a large number of fine air holes 192 arranged in a distributed manner. For this reason, it is possible to supply air (oxygen) throughout the furnace without suppressing the temperature drop in the furnace (while maintaining the inside of the furnace at 700 ° C. or higher).

  In addition, in the boiler system of the present embodiment, the temperature in the combustion furnace 1 is optimized by controlling the air amount described below.

  In the boiler system of the present embodiment, a large amount of air is not introduced into the combustion furnace 1 at once, but the amount of air (combustion gas) pulled from the combustion furnace 1 toward the boiler 4 is supplied to the combustion furnace 1 through the supply path 19. Control is performed so as to be within the range of 100% to 110% of the amount of air supplied to the air. Thereby, it is possible to stably burn the log fuel L until complete combustion and to generate a large amount of superheated steam while suppressing a temperature drop in the furnace.

  That is, in the boiler system of the present embodiment, the combustion furnace 1 is provided with a unique supply path 19, and the temperature in the combustion furnace 1 is set to 700 ° C. by controlling the above-described delicate air amount through the supply path 19. While maintaining the above, air is thoroughly fed into the combustion furnace 1 and the log fuel L having a high water content is continuously burned until complete combustion. Thereby, the combustion gas containing a large amount of superheated steam is supplied to the boiler 4 from the combustion furnace 1, and the efficiency improvement of the boiler 4 is implement | achieved.

  In addition, when the temperature in the combustion furnace 1 is about 500 ° C., for example, when a large amount of log fuel L having a moisture content of about 50% is introduced, thermal fluctuation and temperature decrease occur in the furnace due to the latent heat of moisture, The log fuel L tends to burn incompletely. On the other hand, if the temperature in the combustion furnace 1 is maintained at 700 ° C. or higher, even if a large amount of log fuel L having a water content of about 50% is introduced, thermal fluctuations and temperature reductions are unlikely to occur in the furnace. It is possible to completely burn the log fuel L while generating a large amount of superheated steam.

  Next, an in-region power supply system that supplies energy to an area using the boiler system of the present embodiment will be described with reference to FIG.

  The in-region power supply system of the present embodiment includes a supply path 81 for supplying steam or hot water to supply at least one of the peripheral facilities 9 with steam or hot water generated by the boiler system.

  The peripheral facility 9 is a generic name for various facilities in the area where the boiler system is installed, and specifically, a factory, an agricultural facility, a public facility, and the like. In this embodiment, steam or hot water is supplied through a supply path 81 to a factory 91, an agricultural facility 92, a public facility 93, and the like, which are examples of the peripheral facility 9.

  Furthermore, the in-region power supply system of the present embodiment supplies a power generation device 82 that generates power with steam or hot water generated by a boiler system, and supplies electricity generated by the power generation device 82 to at least one of the peripheral facilities 9. And a heat supply path 84 that supplies waste heat generated in the power generation device 82 to at least one of the peripheral facilities 9.

  In the present embodiment, electricity is supplied through a power supply path 83 to a factory 94 different from the factory 91 among the peripheral facilities 9. In addition, waste heat is supplied through a heat supply path 84 to an agricultural facility 95 other than the agricultural facility 92 in the peripheral facilities 9. The agricultural facility 95 is, for example, an agricultural house.

  Furthermore, the in-area power supply system of the present embodiment includes an odor supply path 85 that supplies odor generated in at least one of the peripheral facilities 9 into the combustion furnace 1 of the boiler system. In this embodiment, as an example, the odor generated in the factory 94 is supplied into the incinerator 1 through the odor supply path 85, and the odor is processed in the incinerator 1.

  Therefore, according to the intra-regional power supply system of the present embodiment, local forest associations and the like cut down timber without special selection from the forest, and supply log fuel L that does not require secondary processing at low cost, Steam or hot water generated by the boiler system based on this log fuel L (that is, a large amount of superheated steam generated from the log fuel L having a high water content is supplied to the boiler 4 so that it can be efficiently generated by the boiler 4. Steam or hot water) can be supplied to the surrounding facility 9. Furthermore, electricity generated by the power generation device 82 based on steam or hot water can be supplied to the peripheral facility 9, and waste heat of the power generation device 82 can also be supplied to the peripheral facility 9.

  Therefore, it is possible to supply energy to the surrounding facilities 9 like local production for local consumption based on forest resources in regions such as mountain villages existing in various parts of Japan. If about 3% of forest trees are cut and planted annually, trees will be replaced every 30 years, and energy can be supplied permanently while contributing to forest management.

  In addition, the combustion apparatus of this embodiment can be used also for uses other than a boiler system.

  That is, if the combustion apparatus of this embodiment is used, as described above, combustion gas containing a large amount of superheated steam can be supplied, and the log fuel L is low-cost and permanent from the forest in the region. Therefore, even when this combustion gas is supplied to another system such as a hot-air drying type garbage disposal system, it can greatly contribute to forest management.

  As described above with reference to the accompanying drawings, the combustion apparatus for log fuel of the present embodiment is generated in the combustion furnace 1, the carry-in mechanism 2 for carrying the log fuel L into the combustion furnace 1, and the combustion furnace 1. And an air supply path 3 for supplying combustion gas to the outside of the furnace. The log fuel L is a fuel made of wood that has not been dried. The carry-in mechanism 2 is a mechanism for carrying the log fuel L intermittently.

Therefore, according to the combustion apparatus for log fuel of the present embodiment, raw timber cut from the forest (raw tree), timber thinned for forest management, timber left after cutting (forest remaining material) The remaining material after use as a building or general wood can be used as the log fuel L without performing a drying process or the like, and the procurement cost of the fuel can be suppressed. In addition, the dedicated combustion furnace 1 for burning the log fuel L can be provided in a smaller size as compared with the furnace for burning the woody biomass fuel, and the boiler 4 and the like can be commercially available, so initial investment can be made. Can be suppressed. Therefore, as possible out to obtain energy in a stable manner and at low cost by utilizing forest resources. And according to the combustion apparatus for log fuel of this embodiment, it becomes possible to supply combustion gas with high heat conductivity containing a large amount of superheated steam using a large amount of water contained in the log fuel L. .

  Furthermore, in the combustion apparatus for log fuel of this embodiment, the combustion furnace 1 burns the log fuel L intermittently carried in using the carry-in mechanism 2 at an atmospheric temperature maintained at 700 ° C. to 1100 ° C., respectively. Is configured to do.

  Therefore, according to the combustion apparatus for log fuel of the present embodiment, a furnace maintained at an ambient temperature of 700 ° C. to 1100 ° C. while carrying log fuel L containing a large amount of moisture intermittently and continuously. In particular, it is possible to efficiently generate combustion gas with high heat transfer containing a large amount of superheated steam.

  Furthermore, in the combustion apparatus for log fuel of the present embodiment, the carry-in mechanism 2 includes a mounting table 21 on which the log fuel L is mounted, a drive mechanism 22 that reciprocates the mounting table 21 in and out of the combustion furnace 1, and a mounting table 21. And a movement restricting mechanism 23 for temporarily restricting the movement of the log fuel L placed on the inside of the combustion furnace 1. The log fuel L is moved into the combustion furnace 1 together with the mounting table 21, and the log 21 is moved outside the combustion furnace 1 while restricting the movement of the log fuel L by the movement restriction mechanism 23. L is configured to drop into the combustion furnace 1.

  Therefore, according to the combustion apparatus for log fuel of the present embodiment, the mounting table 21 and the movement restriction mechanism 23 operate in time in the combustion furnace 1 so that the log fuel L is aimed at the combustion furnace 1. It is possible to arrange a plurality of log fuels L efficiently in the combustion furnace 1 by arranging them regularly in a predetermined posture at the locations. In addition, when the log fuel L is carried in, the log fuel L is also prevented from hitting the surrounding refractory bricks constituting the combustion furnace 1 and damaging the combustion furnace 1.

  Further, in the log fuel combustion apparatus of the present embodiment, the movement restriction mechanism 23 includes a pressing body 231 that can be applied to an end portion of the log fuel L placed on the mounting table 21, and the mounting table 21 is used as the combustion furnace 1. When moving from the inside toward the outside of the combustion furnace 1, the log fuel L is dropped into the combustion furnace 1 from the mounting table 21 while being applied to the pressing body 231.

  Therefore, in the combustion apparatus for log fuel of the present embodiment, the log fuel L is aimed at the inside of the combustion furnace 1 with a simple mechanism that presses the pressing body 231 against the log fuel L when the mounting table 21 returns to the outside of the furnace. It is possible to arrange them regularly at predetermined positions in a predetermined posture.

  Furthermore, the log fuel combustion apparatus of the present embodiment includes an odor supply path 85 for supplying an external odor into the combustion furnace 1.

  Therefore, according to the log fuel combustion apparatus of this embodiment, odor can be supplied into the combustion furnace 1 and decomposed in an atmosphere maintained at a high temperature. Since not only energy such as steam is supplied to an external factory, but also the odor generated in the factory can be decomposed, a very useful system is constructed.

  In addition, the log fuel boiler system of this embodiment includes a boiler 4 that generates steam or hot water using the combustion gas supplied through the air supply path 3 in addition to the log fuel combustion apparatus of this embodiment. Is provided.

  Therefore, according to the boiler system for log fuel of this embodiment, raw timber harvested from the forest (raw tree), timber thinned for forest management, timber left after logging (forest residue) The remaining material after use as a building or general wood can be used as the log fuel L without performing a drying process or the like, and the procurement cost of the fuel can be suppressed. In addition, the dedicated combustion furnace 1 for burning the log fuel L can be provided in a smaller size as compared with the furnace for burning the woody biomass fuel, and the boiler 4 and the like can be commercially available, so initial investment can be made. Can be suppressed. For this reason, it is possible to obtain energy stably and at low cost by using forest resources. As a result, forest resources can be effectively used as alternative energy for fossil fuels, contributing to regional industrial development and permanent forest management. It becomes possible. In addition, according to the boiler system of the present embodiment, a large amount of moisture contained in the log fuel L is used to supply combustion gas containing a large amount of superheated steam to the boiler 4, and steam or hot water is efficiently produced by the boiler 4. Can be generated.

  Moreover, the method of supplying combustion gas using the log fuel combustion apparatus of the present embodiment uses the carry-in mechanism 2 to maintain log fuel while maintaining the atmospheric temperature in the combustion furnace 1 at 700 ° C. to 1100 ° C. By transferring L into the combustion furnace 1 intermittently at a predetermined interval, the log fuel L is continuously burned in the combustion furnace 1 until complete combustion is achieved.

  Therefore, the log fuel L after being carried into the combustion furnace 1 is continuously burned in an atmosphere of 700 ° C. to 1100 ° C., and even the log fuel L having a high water content is completely burned in the furnace. It becomes possible.

  Further, in the method of supplying combustion gas using the combustion apparatus for log fuel of the present embodiment, the first log fuel L is carried into the combustion furnace 1 before the start of combustion, and kerosene is supplied to the first log fuel L. Then, the log fuel L is intermittently carried into the combustion furnace 1 while maintaining the atmospheric temperature in the combustion furnace 1 at 700 ° C. to 1100 ° C. The combustion of the fuel L is continued.

  Therefore, by using the log fuel L consistently from the time of ignition and intermittently carrying in the log fuel L, the combustion gas can be continuously supplied for 24 hours.

  The regional power supply system using the log fuel of the present embodiment includes the log fuel boiler system of the present embodiment and the steam or hot water generated by the boiler system in the area where the boiler system is installed. A supply path 81 for supplying steam or hot water to at least one of the peripheral facilities 9, a power generation device 82 for generating power with the steam or hot water generated by the boiler system, and electricity generated by the power generation device 82 A power supply path 83 that supplies at least one of the facilities 9.

  Therefore, according to the local power supply system of this embodiment, the log fuel L cut from the forest is used to supply steam or hot water to the surrounding facility 9 of the forest, As a substitute for fossil fuels, forest resources can be effectively used to contribute to local industrial development and permanent forest management.

  In addition, the local power supply system using the log fuel according to the present embodiment includes a boiler system for the log fuel according to the present embodiment, a power generation device 82 that generates power with steam or hot water generated by the boiler system, and a power generation device. The electricity generated in 82 is supplied to at least one of the peripheral facilities 9 in the area where the boiler system is installed, and the waste heat generated in the power generation device 82 is supplied to at least one of the peripheral facilities 9. And a heat supply path 84 for supplying the heat.

  Therefore, according to the local power supply system of this embodiment, the log fuel L cut from the forest is used to supply steam or hot water to the surrounding facility 9 of the forest, Can be supplied, and waste heat can be supplied to the surrounding facilities 9. Forest resources can be used effectively as alternative energy for fossil fuels, contributing to local industrial development and permanent forest management. .

  As mentioned above, although embodiment was described, this invention is not limited to each above-described embodiment. Within the range intended by the present invention, appropriate design changes can be made.

DESCRIPTION OF SYMBOLS 1 Combustion furnace 2 Carry-in mechanism 21 Mounting base 22 Drive mechanism 23 Movement control mechanism 231 Press body 3 Air supply path 4 Boiler 81 Steam or hot water supply path 82 Power generation apparatus 83 Power supply path 84 Heat supply path 85 Odor supply path 9 Peripheral facility L Log fuel

Claims (9)

A combustion furnace;
A loading mechanism for intermittently loading log fuel into the combustion furnace;
An air supply path for supplying combustion gas generated in the combustion furnace to the outside of the furnace,
The log fuel is a fuel composed of wood that has not been dried,
The carry-in mechanism is
A mounting table on which the log fuel is placed;
A drive mechanism for reciprocating the mounting table in and out of the combustion furnace;
A movement restricting mechanism for temporarily restricting the movement of the log fuel placed on the mounting table in the combustion furnace,
The log fuel is moved into the combustion furnace together with the mounting table, and the log fuel is moved by moving the mounting table toward the outside of the combustion furnace while restricting the movement of the log fuel by the movement restriction mechanism. A combustion apparatus for log fuel, wherein the combustion apparatus is configured to drop into the combustion furnace . The movement restriction mechanism is
A pressing body that can be applied to an end of the log fuel placed on the mounting table,
When moving the mounting table from the inside of the combustion furnace toward the outside of the combustion furnace, the log fuel is dropped from the mounting table into the combustion furnace while being applied to the pressing body, The combustion apparatus for log fuel according to claim 1. The combustion furnace is
The said log fuel carried in intermittently using the said carrying-in mechanism is comprised so that it may combust at the atmospheric temperature maintained at 700 to 1100 degreeC, respectively, It is characterized by the above-mentioned. A combustion apparatus for log fuel as described. The combustion apparatus for log fuel according to any one of claims 1 to 3, further comprising an odor supply path for supplying an external odor into the combustion furnace. A combustion apparatus for log fuel according to any one of claims 1 to 4,
A boiler system for log fuel, comprising: a boiler that generates steam or hot water using the combustion gas supplied through the air supply path. A method for supplying combustion gas using the log fuel combustion device according to any one of claims 1 to 4,
While maintaining the atmospheric temperature in the combustion furnace at 700 ° C. to 1100 ° C.,
By using the carry-in mechanism, the log fuel is carried into the combustion furnace intermittently at a predetermined interval,
A method for supplying combustion gas using log fuel, wherein the log fuel is continuously burned in the combustion furnace until each of the log fuels reaches complete combustion. A method for supplying combustion gas using the log fuel combustion device according to any one of claims 1 to 4,
Before starting combustion, carry the first log fuel into the combustion furnace,
Ignite the first log fuel with kerosene,
Thereafter, the log fuel is intermittently carried into the combustion furnace while maintaining the atmospheric temperature in the combustion furnace at 700 ° C. to 1100 ° C., whereby the log fuel is burned in the combustion furnace. A method for supplying combustion gas using log fuel, which is characterized by being continued. A boiler system for log fuel according to claim 5;
A steam or hot water supply path for supplying the steam or hot water generated by the boiler system to at least one of the surrounding facilities in the area where the boiler system is installed;
A power generator for generating power with the steam or hot water generated by the boiler system;
An in-region power supply system using log fuel, comprising: a power supply path for supplying electricity generated by the power generation device to at least one of the surrounding facilities. A boiler system for log fuel according to claim 5;
A power generator for generating power with the steam or hot water generated by the boiler system;
A power supply path for supplying electricity generated by the power generation device to at least one of the surrounding facilities in the area where the boiler system is installed;
An in-region power supply system using log fuel, comprising: a heat supply path for supplying waste heat generated in the power generation device to at least one of the surrounding facilities.

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