JP2019082327A - Combustion device for log fuel, boiler system for log fuel, supply method of combustion gas using log fuel, and in-district power supply system using log fuel - Google Patents

Abstract

To stably obtain energy by utilizing forest resource while suppressing acquisition cost of a fuel and suppressing cost of equipment investment.SOLUTION: A combustion device includes a combustion furnace 1 exclusively used for burning log fuel, and a carrying-in mechanism 2 for carrying the log fuel into the combustion furnace 1, and a combustion gas generated in the combustion furnace 1 is supplied to a boiler 4 and the like. The log fuel is a fuel composed of timber on which drying treatment is not performed. The carrying-in mechanism 2 is a mechanism for intermittently carrying in the log fuel at prescribed intervals. The combustion furnace 1 includes a carrying-in port 11 for carrying the log fuel into the furnace, and an opening/closing mechanism for opening and closing the carrying-in port 11. The carrying-in port 11 is closed after completion of the carrying-in of the log fuel, and the log fuel is burned in the furnace under an atmosphere temperature kept at 700°C-1100°C.SELECTED DRAWING: Figure 1

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-area power feeding system using log fuel.

  In order to make effective use of forest resources, a system has been proposed in which wood biomass fuel such as wood pellets and wood chips is used to burn these in a dedicated furnace to supply combustion gas and generate electric power etc. (patented) Reference 1 etc.). The woody biomass fuel is obtained by drying, crushing, etc. the raw wood after harvesting.

JP, 2013-210123, A

  In the above-described conventional system, secondary processing is required to dry, grind, etc. the raw wood after felling in order to obtain a woody biomass fuel to be burned in the furnace. Therefore, in order to obtain woody biomass fuel, processing machines and additional energy are required. In addition, it takes time to dry the raw wood after harvesting. As a result, the procurement cost of woody biomass fuel is high.

  Further, the above-described conventional system is a system in which a pelletized or chipped wood biomass fuel 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, which increases the initial investment.

  For these reasons, the above-mentioned conventional systems have not been introduced at present, and effective utilization of forest resources has been difficult.

  The problem to be solved by the present invention is to obtain stable energy using forest resources while keeping the cost of fuel procurement low and the cost of equipment investment low.

  In order to solve the above-mentioned subject, a combustion device for log fuel concerning one mode of the present invention has a combustion furnace, a carrying-in mechanism which carries in log fuel to the above-mentioned combustion furnace, A combustion gas which arose in the above-mentioned combustion furnace And an air supply path for supplying the outside. The log fuel is a fuel composed of wood which has not been subjected to drying treatment. The loading mechanism is a mechanism for intermittently loading the log fuel. The combustion furnace includes a loading port capable of loading the log fuel into the furnace, and an opening / closing mechanism for opening and closing the loading port. When the loading of the log fuel is completed, the loading port is closed and loaded. The log fuel is configured to burn at an ambient temperature maintained at 700 ° C. to 1100 ° C. in the furnace.

  Further, 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 air supply passage. And a boiler for generating steam or hot water.

  Further, in order to solve the above problems, the 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 burner for a log fuel, The combustion is performed by intermittently loading the log fuel into the combustion furnace at a predetermined interval using the loading mechanism while maintaining the ambient temperature in the combustion furnace at 700 ° C. to 1100 ° C. In the furnace, the log fuel is continuously burned until it is completely burned.

  Further, in order to solve the above problems, the 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 burner for a log fuel, Before the start of combustion, the first log fuel is carried into the combustion furnace, kerosene is added to the first log fuel to ignite, and thereafter, the ambient temperature in the combustion furnace is maintained at 700 ° C. to 1100 ° C. Meanwhile, 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.

  Further, in order to solve the above problems, the regional feed system using a log fuel according to one aspect of the present invention includes the above-described boiler system for the 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 peripheral facilities in an area where the boiler system is installed, a power generation apparatus for generating electric power with the steam or hot water generated by the boiler system, the power generation apparatus And a feed path for supplying the electricity generated in step (1) to at least one of the peripheral facilities.

  Moreover, in order to solve the said subject, the area electric power feeding system using the log fuel which concerns on one aspect of this invention is the boiler system for log fuels mentioned above, and the said steam or warm water generated with the said boiler system. A power generation device for generating power, a feed path for supplying the power generated by the power generation device to at least one of peripheral facilities in the area where the boiler system is installed, and waste heat generated by the power generation device; And a heat supply path for supplying at least one of the peripheral facilities.

  The present invention is effective in that energy can be stably obtained using forest resources while suppressing the cost of fuel procurement and suppressing the cost of facility investment.

It is a partially broken side view showing a 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 the principal part of FIG. 1 from upper direction. FIG. 5A to FIG. 5D are schematic side views showing the state of dropping log fuel in order. It is a top view which shows the modification of a carrying-in mechanism. It is a schematic diagram which shows the area energy supply system of one Embodiment of this invention.

  1 to 5 show a combustion apparatus for log fuel according to one embodiment and a boiler system for log fuel provided with the combustion apparatus.

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

  Log fuel L is a fuel composed of undried wood, specifically, raw wood (raw wood) harvested from the forest, lumber thinned for forest management, logging It is wood left after being left behind (forest remnants), and leftovers after being used as construction 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 the moisture content are not particularly limited. The log fuel L may have a water content exceeding 50%.

  That is, in the case of general woody biomass fuel such as wood pellets and wood chips, the wood is refined by using a dedicated processing machine in secondary processing, and it takes time until the water content reaches 25% or less, and it is dried In the case of log fuel L, it is not necessary to process it.

  The combustion apparatus according to the present embodiment includes a combustion furnace 1 specially designed to burn log fuel L having a high moisture content, a loading mechanism 2 used to load log fuel L into combustion furnace 1, and combustion furnace 1. It has an air supply path 3 for supplying the generated combustion gas, and a control panel 6 for controlling the loading mechanism 2 and the like.

  And, in addition to the combustion apparatus of the present embodiment, the boiler system of the present embodiment includes the boiler 4 to which the combustion gas is supplied through the air supply passage 3 and a heat exchanger that reuses the combustion gas discharged from the boiler 4 And an air pollution control device 7 for removing pollutants in the combustion gas and discharging the air to the atmosphere.

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

  First, the combustion apparatus of the present embodiment will be described based on FIG. 2, FIG. 3, and the like.

  The combustion furnace 1 provided in the combustion apparatus of the present embodiment is a furnace specially designed to burn 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 loading port 11 capable of carrying the log fuel L into the furnace, and an exhaust port 12 capable of discharging the combustion gas generated in the furnace to the outside of the furnace. In the combustion furnace 1, a mesh-like floor 13 is provided which divides the inside of the furnace into upper and lower parts.

  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 is provided with a discharge port 15 capable of taking out the ash from the incineration ash chamber 102. The inlet 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.

  Furthermore, the combustion furnace 1 includes an opening and closing mechanism 16 for opening and closing the inlet 11 and an opening and closing mechanism 17 for discharging and opening the outlet 15.

  The opening and closing mechanism 16 for loading includes a heat resistant door 161 capable of closing the loading port 11 and a cylinder 162 for moving the door 161 up and down, and seals the loading port 11 when the door 161 is at the lower position. Stop and open the inlet 11 when the door 161 is in the upper position.

  The discharge opening / closing mechanism 17 includes a heat-resistant door 171 capable of closing the discharge port 15 and a cylinder 172 for moving the door 171 in the horizontal direction, and the discharge is performed when the door 171 is at a predetermined position on a horizontal surface. The outlet 15 is sealed and the outlet 15 is opened when the door 171 is in 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 fed 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 shell layer 142 constituting the combustion furnace 1, and a number of air holes 192 formed in the refractory brick layer 141. The large number of air holes 192 are formed on the wall surfaces of the refractory brick layer 141 except for the ceiling in a substantially even arrangement at a predetermined interval. The predetermined distance preferably falls within a range of 5 cm to 10 cm. Each air hole 192 is a fine hole having an opening width of about several millimeters.

  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 shell layer 142 is an iron layer formed to cover the refractory brick layer 141. Air is supplied from the outside by the fan 18 to the space 191 between the refractory brick layer 141 and the outer shell layer 142.

  Each air hole 192 communicates with the space 191. The air fed 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 except the ceiling of the combustion furnace 1.

  Next, the loading mechanism 2 provided in the combustion apparatus of the present embodiment will be described based on FIG. 2, FIG. 4, FIG. 5, and the like.

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

  The loading mechanism 2 is a mechanism provided adjacent to the loading port 11 of the combustion furnace 1 and includes a work floor 24 on which a worker can move and a groove 25 having a shape in which a part of the work floor 24 is recessed. A mounting base 21 provided on the bottom of the groove 25 in a reciprocating manner in one direction (hereinafter, this direction is referred to as "longitudinal direction"), and a pressing body provided on the mounting base 21 to be capable of reciprocating in the front-rear direction And 231.

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

  A plurality of (two in the present embodiment) rails 26 are installed on the work floor 24 at positions adjacent to the groove 25 in the left-right direction. The plurality of rails 26 are parallel to each other with 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 capable of rolling on the floor surface of the groove 25 and a connection piece 212 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 which can be extended and contracted 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 provided with a cylinder 2321 which can extend and contract in the front-rear direction. The pressing body 231 is a plate having a thickness in the front-rear direction, and the log fuel L presses 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 2311 is provided with a plurality of wheels 2312 that can roll on the mounting table 21.

  FIGS. 5A to 5D schematically show that the log fuel L is regularly dropped onto the floor 13 by moving the mounting table 21 and the pressing body 231 back and forth at the same timing.

  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, only one log fuel L is shown in FIGS. 5A to 5D for simplicity.

  Next, as shown in FIG. 5B, after lifting the door 161 (see arrow a1), both the mounting table 21 and the pressing body 231 are advanced toward the inside of the combustion chamber 101 of the combustion furnace 1 (see arrow a2) . At the stage where the log fuel L reaches near 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 advancing at a position about half of the mounting table 21 in the front-rear direction.

  Next, as shown in FIG. 5C, the mounting table 21 is retracted 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). At 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 (refer to arrow a6), as shown in FIG. 5D, the rear end of the log fuel L can be dropped to a target location on the floor 13 (refer to arrow a7) . Through the above steps, the log fuel L can be regularly arranged at a predetermined position on the floor 13 at a central portion.

  When loading of the log fuel L is completed, the loading table 21 and the pressing body 231 may be retracted to the original positions, and then the door 161 may be lowered to close the loading port 11.

  As described above, in the present embodiment, the log fuel L is pressed by pressing the pressing body 231 against the log fuel L at the timing when the mounting table 21 retracts, thereby restricting (preventing movement of) the log fuel L. Are regularly dropped into the central portion of the floor 13. In the present embodiment, the movement restricting mechanism 23 for temporarily restricting the movement of the log fuel L in the combustion furnace 1 is configured by the pressing body 231 and the drive mechanism 232 for changing the longitudinal position of the pressing body 231. There is.

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

  The air supply passage 3 is a passage that brings the combustion furnace 1 and the boiler 4 into communication with each other. One end of the air supply passage 3 communicates with the exhaust port 12 of the combustion furnace 1, and the other end of the air supply passage 3 communicates with the boiler 4.

  Next, other configurations provided in the boiler system of the present embodiment will be described in order based on FIG. 1, FIG. 2 and the like.

  The boiler 4 is a device that generates steam or hot water using the combustion gas supplied through the air supply passage 3. As the boiler 4, various types such as a furnace-type smoke pipe type and a water pipe type can be applied, and ones suitable for the implementation conditions are selected carefully from commercially available devices and used.

  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 selected and used from commercially available devices.

  The air pollution control device 7 is a device for removing pollutants contained in the combustion gas and releasing it to 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 removing the contaminants in the first and second devices 71 and 72 to the atmosphere. As each of the devices 71, 72, 73, a device which meets the implementation conditions is selected and used from commercially available devices.

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

  First, the first log fuel L is carried into the combustion furnace 1 at a stage prior to the start of the combustion in the combustion furnace 1. Specifically, an appropriate one is selected from a large number of log fuels L stacked on the rail 26, and the operator drops the selected log fuel L into the groove 25 while sliding it on the rail 26. set.

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

  As in the modification shown in FIG. 6, it is also preferable to set the robot hand 27 at a position adjacent to the groove 25 and to 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 board 6.

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

  When the operator operates the lever, button or the like provided on the control panel 6, regularly dropping a plurality of ignition log fuels L1 into the combustion furnace 1 in the steps described above with reference to FIGS. 5A to 5D. Can. That is, by operating the predetermined lever provided on the control board 6, the door 161 of the combustion furnace 1 is lifted to open the loading port 11, and the mounting log 21 and the ignition log fuel L1 are carried into the combustion furnace 1. When the mounting table 21 is returned to the outside of the furnace, the pressing log 231 is not applied to the ignition log fuel L1 so that it does not return, whereby the ignition log fuel L1 is regularly dropped into the combustion furnace 1 it can.

  After confirming that the mounting table 21 and the pressing body 231 have receded to the outside of the furnace, the door 161 is lowered to seal the loading port 11.

  After that, 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.

  The combustion log fuel L1 is burned for a predetermined time in the combustion furnace 1 to bring the atmosphere temperature in the combustion furnace 1 to 700 ° C. to 1100 ° C., and thereafter, the atmosphere temperature in the combustion furnace 1 is maintained. The log fuel L is intermittently carried into the combustion furnace 1.

  That is, while maintaining the ambient 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 combustion of the log fuel L is continued in the combustion furnace 1 by dropping it in a controlled manner. It is further preferable to maintain the ambient temperature in the combustion furnace 1 at 900-1100 ° C. or 1000-1100 ° C. The newly introduced log fuel L is superimposed on the burning log fuel L, and naturally burns in the 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 until it reaches complete combustion in the combustion furnace 1. Ashes after complete combustion open the door 171 regularly and take them out of the furnace.

  In the boiler system of the present embodiment, since the log fuel L is continuously burned for 24 hours in the combustion furnace 1 and the combustion gas is continuously supplied to the boiler 4 for 24 hours, the boiler 4 is continued for 24 hours. Steam or hot water can be produced 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, the combustion of the carbonized log fuel L is interrupted. In order to restart the combustion in the combustion furnace 1, the supply of air into the combustion furnace 1 may be restarted.

  By the way, in the boiler system of the present embodiment, as shown also in Table 1, the result that steam (or hot water) can be generated in the boiler 4 with the efficiency equal to or higher than the case of using dried wood biomass fuel It is obtained.

  It is inferred that this result is attributable to 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 apparatus included therein).

  That is, the boiler system of the present embodiment does not use a low water content (for example, 25% or less) fuel such as conventional woody biomass fuel, but uses a log fuel L with a water content of 40% to 50% or more In the system which generates a large amount of superheated steam in the combustion furnace 1 by intermittently charging the combustion furnace 1 and controlling the combustion so as to maintain the temperature in the combustion furnace 1 at 700.degree. C. or higher. is there.

  Superheated steam has the property that heat conductivity is very high as compared to hot air at the same temperature, so a boiler can be continuously supplied with combustion gas containing a large amount of superheated steam from the combustion furnace 1 to the boiler 4 It is inferred that the efficiency of 4 has been improved and a large amount of steam has been generated from the boiler 4.

  In the boiler system of the present embodiment, the 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). It is realized that the log fuel L is completely burned while generating a large amount of superheated steam using water.

  As described above, the air fed by the air supply fan 18 is once fed into the space 191 between the refractory brick layer 141 and the iron shell layer 142 and 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 the many fine air holes 192 distributed. Therefore, it is possible to supply air (oxygen) to the inside of the furnace while suppressing the temperature decrease 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 amount of air described below.

  In the boiler system of the present embodiment, the amount of air (combustion gas) to be pulled from the combustion furnace 1 to the boiler 4 side is not introduced into the combustion furnace 1 through the supply path 19 instead of introducing a large amount of air into the combustion furnace 1 at a stretch. Control is performed so as to be within the range of 100% to 110% of the amount of air supplied to the. As a result, it is possible to stably burn the log fuel L up to complete combustion while generating a large amount of superheated steam while suppressing the temperature decrease in the furnace.

  That is, in the boiler system of the present embodiment, the combustion furnace 1 is provided with its own supply passage 19, and the temperature of the combustion furnace 1 is set to 700 ° C. by controlling the above-mentioned delicate air amount through the supply passage 19. While maintaining the above, it is possible to feed air into the combustion furnace 1 without difficulty, and to continuously burn the log fuel L having a high moisture content until complete combustion. As a result, the combustion gas containing a large amount of superheated steam is supplied from the combustion furnace 1 to the boiler 4 to realize the efficiency improvement of the boiler 4.

  When the temperature in the combustion furnace 1 is, for example, about 500 ° C., when a large amount of log fuel L having a water content of about 50% is introduced, the latent heat of water causes thermal fluctuation and temperature decrease in the furnace, Log fuel L tends to be incompletely burned. On the other hand, when 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 supplied, thermal fluctuation and temperature decrease hardly occur in the furnace, It is possible to burn the log fuel L completely while generating a large amount of superheated steam.

  Next, the in-area power feeding system for supplying energy to the area using the boiler system of the present embodiment will be described based on FIG. 7 and the like.

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

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

  Furthermore, the intra-area power feeding system according to the present embodiment supplies at least one of the peripheral facilities 9 with the power generation device 82 that generates power from steam or hot water generated by the boiler system and the power generated by the power generation device 82. Power supply path 83, and a heat supply path 84 for supplying waste heat generated by the power generation device 82 to at least one of the peripheral facilities 9.

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

  Furthermore, the intra-area power supply system of the present embodiment includes an odor supply path 85 for supplying the odor generated in at least one of the peripheral facilities 9 into the combustion furnace 1 of the boiler system. In the present 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 in-area power feeding system of the present embodiment, the local forest association etc. cuts down the wood without special sorting from the forest, and supplies the log fuel L which does not require secondary processing at low cost. Steam or hot water generated by the boiler system based on the log fuel L (that is, a large amount of superheated steam generated from the log fuel L having a high moisture content is supplied to the boiler 4, thereby efficiently generated by the boiler 4 Steam or hot water) can be supplied to the surrounding facilities 9. Furthermore, electricity generated by the power generation device 82 can be supplied to the peripheral facility 9 based on steam or hot water, 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 peripheral facilities 9 like local production for local consumption based on forest resources in areas such as mountain villages that exist in various places in Japan. If approximately 3% of the trees in the forest are harvested and replanted, it will be possible to replace the trees on a cycle of about 30 years and provide energy 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, with the combustion apparatus of this embodiment, as described above, it is possible to supply combustion gas containing a large amount of superheated steam, and the log fuel L is low cost and durable from the forest in the area. When the combustion gas is supplied to another system such as a hot air drying type garbage disposal system, it can also contribute significantly to forest management.

  As described above with reference to the attached drawings, the combustion apparatus for log fuel according to the present embodiment is generated by the combustion furnace 1, the loading mechanism 2 for carrying the log fuel L into the combustion furnace 1, and the combustion furnace 1. And an air supply passage 3 for supplying the combustion gas to the outside of the furnace. The log fuel L is a fuel composed of wood which has not been subjected to the drying process. The loading mechanism 2 is a mechanism for intermittently loading the log fuel L.

  Therefore, according to the burning device for log fuel of the present embodiment, raw wood harvested from the forest (live wood), lumber thinned for forest management, lumber left after harvesting (forest remnant) The remaining material and the like after being used as construction or general wood can be used as the log fuel L without being subjected to the drying process and the like, and the procurement cost of the fuel can be suppressed. Also, since the dedicated combustion furnace 1 for burning the log fuel L can be provided in a smaller size than the furnace for burning woody biomass fuel, and since the boiler 4 and the like can use commercially available ones, initial investment It can be suppressed. Therefore, energy can be obtained stably and at low cost using forest resources. And according to the combustion apparatus for log fuel of this embodiment, it becomes possible to supply highly thermally conductive combustion gas containing a large amount of superheated steam by using a large amount of water contained in the log fuel L. .

  Furthermore, in the combustion apparatus for log fuel according to the present embodiment, the combustion furnace 1 burns the log fuel L intermittently carried in using the carry-in mechanism 2 at an ambient temperature maintained at 700 ° C. to 1100 ° C. It is configured to

  Therefore, according to the combustion apparatus for log fuel of the present embodiment, the furnace maintained at an ambient temperature of 700 ° C. to 1100 ° C. while intermittently and continuously carrying in the log fuel L containing a large amount of water. It is possible to efficiently generate a highly thermally conductive combustion gas containing a large amount of superheated steam.

  Furthermore, in the combustion apparatus for log fuel according to the present embodiment, the loading mechanism 2 includes a mounting table 21 on which the log fuel L is placed, a drive mechanism 22 that reciprocates the mounting table 21 to the inside and outside of the combustion furnace 1, and the mounting table 21. And a movement restriction mechanism 23 for temporarily restricting movement of the log fuel L placed on the inside of the combustion furnace 1. Then, the log fuel L is moved together with the mounting table 21 into the combustion furnace 1, and the movement restriction mechanism 23 restricts the movement of the log fuel L while moving the mounting table 21 toward the outside of the combustion furnace 1, whereby the log fuel L is configured to be dropped 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 at the same timing in the combustion furnace 1 to aim the log fuel L in the combustion furnace 1. The plurality of log fuels L can be efficiently burned in the combustion furnace 1 by arranging them regularly in a predetermined posture. In addition, when the log fuel L is carried in, the log fuel L is also prevented from being hit by firebricks and the like in the periphery of the combustion furnace 1 and damaging the combustion furnace 1.

  Furthermore, in the combustion apparatus for log fuel according to 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. When moving from the inside toward the outside of the combustion furnace 1, the log fuel L is dropped from the mounting table 21 into the combustion furnace 1 while being applied to the pressing body 231.

  Therefore, in the combustion apparatus for log fuel of this embodiment, the aim of the log fuel L is set in the combustion furnace 1 by a simple mechanism that presses the pressing body 231 against the log fuel L at the timing when the mounting table 21 returns to the outside of the furnace. It becomes possible to arrange regularly in a predetermined posture at the place of.

  Furthermore, in the combustion apparatus for log fuel of the present embodiment, the combustion furnace 1 is provided with an odor supply path 85 for supplying an external odor.

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

  Further, the boiler system for log fuel of the present embodiment is a boiler 4 that generates steam or hot water using combustion gas supplied through the air supply passage 3 in addition to the combustion device for log fuel of the present embodiment. Equipped with

  Therefore, according to the boiler system for log fuel of this embodiment, raw wood harvested from the forest (live wood), lumber thinned for forest management, lumber left after harvesting (forest remnant) The remaining material and the like after being used as construction or general wood can be used as the log fuel L without being subjected to the drying process and the like, and the procurement cost of the fuel can be suppressed. Also, since the dedicated combustion furnace 1 for burning the log fuel L can be provided in a smaller size than the furnace for burning woody biomass fuel, and since the boiler 4 and the like can use commercially available ones, initial investment It can be suppressed. Therefore, it is possible to obtain energy stably and at low cost using forest resources, and effectively utilize forest resources as alternative energy for fossil fuels, and contribute to regional industrial development and permanent forest management It becomes possible. In addition, according to the boiler system of the present embodiment, combustion gas containing a large amount of superheated steam is supplied to the boiler 4 by using a large amount of water contained in the log fuel L, and the boiler 4 efficiently generates steam or hot water. It is possible to generate

  Moreover, the method of supplying combustion gas using the combustion apparatus for log fuels of this embodiment maintains the atmosphere temperature in the combustion furnace 1 at 700 ° C. to 1100 ° C., while using the carry-in mechanism 2, the log fuel By intermittently loading L into the combustion furnace 1 at predetermined intervals, the log fuel L is continuously burned in the combustion furnace 1 until complete combustion.

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

  In the method of supplying combustion gas using the combustion apparatus for log fuel according to the present embodiment, the first log fuel L is carried into the combustion furnace 1 before the start of combustion, and kerosene is added to the first log fuel L. After that, the log fuel L is intermittently carried into the combustion furnace 1 while maintaining the ambient temperature in the combustion furnace 1 at 700 ° C. to 1100 ° C. The combustion of the fuel L is continued.

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

  Further, the regional feed system using the log fuel of the present embodiment includes the boiler system for the log fuel of the present embodiment and the steam or hot water generated by the boiler system in the area where the boiler system is installed. There is provided a steam or hot water supply path 81 to be supplied to at least one of the peripheral facilities 9, a power generation apparatus 82 for generating power with the steam or hot water generated by the boiler system, and electricity generated by the power generation apparatus 82 And a feed path 83 for supplying to at least one of the facilities 9.

  Therefore, according to the in-area power feeding system of the present embodiment, using the log fuel L harvested from the forest, supplying steam or hot water to the peripheral facility 9 of the forest, or supplying electricity to the peripheral facility 9 It is possible to supply forest resources effectively as alternative energy for fossil fuels, and contribute to regional industrial development and permanent forest management.

  Further, the regional power feeding 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 configured to generate power with steam or hot water generated by the boiler system, A feed path 83 for supplying the electricity generated at 82 to at least one of the peripheral facilities 9 located in the area where the boiler system is installed, and waste heat generated at the power generation apparatus 82 at least one of the And a heat supply path 84 for supplying

  Therefore, according to the in-area power feeding system of the present embodiment, using the log fuel L harvested from the forest, supplying steam or hot water to the peripheral facility 9 of the forest, or supplying electricity to the peripheral facility 9 Can supply waste heat to peripheral facilities 9, effectively utilizing forest resources as alternative energy for fossil fuels, and contributing to regional industrial development and permanent forest management .

  As mentioned above, although embodiment was described, this invention is not limited to each above-mentioned embodiment. Appropriate design changes can be made within the intended scope of the present invention.

DESCRIPTION OF SYMBOLS 1 combustion furnace 2 carrying-in mechanism 21 mounting base 22 drive mechanism 23 movement control mechanism 231 pressing body 3 air supply path 4 boiler 81 supply path of steam or hot water 82 power generator 83 electric 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 loading log fuel into the combustion furnace;
And an air supply path for supplying the combustion gas generated in the combustion furnace to the outside of the furnace,
The log fuel is a fuel composed of undried wood,
The loading mechanism is a mechanism for intermittently loading the log fuel,
The combustion furnace is
A loading port through which the log fuel can be loaded into the furnace;
An opening and closing mechanism for opening and closing the loading port;
When loading of the log fuel is completed, the loading port is closed, and the loaded log fuel is configured to burn at an ambient temperature maintained at 700 ° C. to 1100 ° C. in the furnace. A combustion device for log fuel. The loading mechanism is
A mounting table on which the log fuel is placed;
A drive mechanism for reciprocating the mounting table into and out of the combustion furnace;
A movement restriction mechanism for temporarily restricting movement of the log fuel placed on the mounting table in the combustion furnace,
The log fuel is moved together with the mounting table into the combustion furnace, and the movement restriction mechanism restricts the movement of the log fuel while moving the mounting table toward the outside of the combustion furnace to move the log fuel. The combustion apparatus for log fuel according to claim 1, wherein the combustion apparatus is configured to be dropped into the combustion furnace. The movement restriction mechanism
A pressing body capable of being 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. A combustion apparatus for log fuel according to claim 2.   The combustion apparatus for a 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 a 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 passage. It is a method of supplying combustion gas using the combustion apparatus for log fuel as described in any one of Claims 1-4,
While maintaining the ambient temperature in the combustion furnace at 700 ° C. to 1100 ° C.,
By intermittently loading the log fuel into the combustion furnace at predetermined intervals using the loading mechanism,
A method of supplying combustion gas using log fuel, wherein the log fuel is continuously burned until complete combustion in the combustion furnace. It is a method of supplying combustion gas using the combustion apparatus for log fuel as described in any one of Claims 1-4,
Before the start of combustion, the first log fuel is carried into the combustion furnace,
Kerosene is added to the first log fuel to ignite,
Thereafter, while the atmospheric temperature in the combustion furnace is maintained at 700 ° C. to 1100 ° C., the log fuel is intermittently carried into the combustion furnace to burn the log fuel in the combustion furnace. The supply method of the combustion gas using log fuel characterized by continuing. 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 peripheral facilities in an area where the boiler system is installed;
A power generation device that generates power using the steam or hot water generated by the boiler system;
An intra-area feed system using a log fuel, comprising: a feed path for feeding the electricity generated by the power generator to at least one of the peripheral facilities. A boiler system for log fuel according to claim 5;
A power generation device that generates power using the steam or hot water generated by the boiler system;
A feed path for supplying the electricity generated by the power generation device to at least one of peripheral facilities in an area where the boiler system is installed;
An area feed system using a log fuel, comprising: a heat supply path for supplying waste heat generated by the power generator to at least one of the peripheral facilities.

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