JP2011241053A - Coal storage facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coal storage facility where the reverse flow of outside air to a coal conveying passage is prevented.SOLUTION: The coal storage facility includes the conveying passage for 161 carrying the coal, a conveying-passage cover 164 with an opening 165 on its periphery for covering the conveying passage 161, and a ventilating unit 170 attached in the opening 165. The ventilating unit 170 includes: a lower cylinder member 171 and an upper cylinder member 172 extending upward from the opening 165; a fan 182 arranged inside the cylinder members and rotated by driving force of a driving part 181; a ceiling hood 173 which has a ceiling 173a arranged above the cylinder member, and a side extending to cover the upper part of the periphery of the cylinder member continuing from the periphery of the ceiling 173a; and a side hood 190 which has a bottom facing an exhaust port and arranged below the exhaust port, and a slide wall extending toward the side of the ceiling hood 173 continuing from the bottom.

Description

  The present invention relates to a coal storage facility for storing coal until it is used in a thermal power plant or the like.

  Thermal power plants obtain electric energy using coal, oil, natural gas or the like as fuel. Of these fuels, coal is stored in a coal storage tank in the coal storage facility until it is combusted in a boiler after being transported. The stored coal is suitably discharged from the coal storage tank and placed on the transfer path, transferred to the boiler, or air-cooled and transferred again to the coal storage tank (see, for example, Patent Document 1).

  This conveyance path is partly provided outside the building of the coal storage tank, and the external part is covered with a conveyance path cover so as not to be affected by the weather. The transport path cover is provided with a ventilation unit for discharging internal air to the outside at a plurality of locations.

JP 2007-45564 A

  However, air may flow backward from the exhaust port of the ventilation unit, such as when there is strong wind outside the outer portion of the transport path, and the air inside the transport path cover may not be exhausted well.

  The subject of this invention is providing the coal storage equipment by which the backflow of the external air to the conveyance path of coal was prevented.

  The present invention solves the above problems by the following means.

(1) The coal storage facility of the present invention includes a conveyance path that conveys coal, a conveyance path cover that covers the conveyance path and has an opening on a peripheral surface, and a ventilation unit that is attached to the opening. The ventilation unit includes a cylindrical member extending upward from the opening, a fan disposed inside the cylindrical member and rotated by the driving force of the driving unit, and disposed above the cylindrical member. And a side portion extending so as to cover the upper portion of the outer peripheral surface of the cylindrical member continuously from the periphery of the ceiling portion, and exhausting between the side portion and the outer peripheral surface of the cylindrical member A cap-shaped member in which a mouth is formed, a bottom provided opposite to the exhaust port, and a side wall extending below the exhaust port and extending continuously from the bottom to the side portion of the cap-shaped member A windbreak portion having a portion.

  The coal transported through the transport path may have an increased temperature or may generate CO. For this reason, the ventilation path cover which covers a conveyance path is provided with the ventilation unit, and exhausts the air in a conveyance path cover outside. This ventilation unit ventilates the air inside the conveyance path, promotes a decrease in coal temperature, and reduces the CO concentration in the conveyance path cover. Here, when the transport path cover is not provided, or when the outside of the transport path cover is a strong wind, etc., the wind flows backward through the ventilation unit and the air flows into the transport path cover, and the air in the transport path cover It may not be exhausted well. However, according to the present invention, since the exhaust port of the ventilation unit is covered with the wind shield, the reverse flow of the wind entering the ventilation unit through the exhaust port is prevented. As a result, the exhaust of the air in the transport path cover is performed well.

(2) In the coal storage facility, the bottom portion extends horizontally outward from the outer peripheral surface of the cylindrical member, and the side wall portion is inclined upward from the outer edge portion of the bottom portion with respect to the vertical direction. It may extend in a direction away from the cylindrical member.

  When the wind blowing along the transport path cover collides with the cylindrical member of the ventilation unit, the wind blows up from the bottom along the outer peripheral surface of the cylindrical member. At this time, when the side wall portion of the windbreak portion is inclined with respect to the vertical direction and extends upward in a direction away from the cylindrical member, the wind blown up from below is guided in a direction away from the cylindrical member. .

(3) The transport path is inclined with respect to the horizontal direction, a part of the side wall portion faces the lower side of the transport path, and the other part of the side wall portion faces the upper side of the transport path. The length of the part of the side wall portion that extends upward may be longer than the length of the part of the side wall portion that extends upward.

  If the transport path is inclined with respect to the horizontal direction, the wind will easily blow from the bottom along the transport path cover, and the wind will collide with the side of the ventilation unit facing the lower side of the transport path. To do. Increasing the length of the side wall portion that extends above the portion facing the lower side of the conveyance path can effectively prevent the wind blown from below from flowing into the exhaust port.

  ADVANTAGE OF THE INVENTION According to this invention, the coal storage facility by which the backflow of the external air to the coal conveyance path was prevented can be provided.

It is a figure which shows the relationship between the coal silo in a thermal power plant, a boiler, a turbine, and a generator. It is a figure which shows the coal storage equipment containing a coal silo and the surrounding coal conveyance apparatus. It is a figure explaining the hopper for coal carrying out provided in the lower part of the coal silo, a discharging machine, and a hopper lower conveyor. It is an enlarged view of the part arrange | positioned outside the building in a secondary delivery conveyor. (A) is a side view of a ventilation unit, (b) is a sectional side view of a ventilation unit. It is a block diagram of the conveyance control system of a coal storage facility. It is a flowchart which shows the external supply control of a conveyance control apparatus. It is a flowchart which shows the overall control including the coal transshipment control of coal. It is a flowchart which shows coal transshipment control.

  Hereinafter, a coal storage facility for a thermal power plant according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a relationship among a coal silo 4, a boiler 7, turbines 10, 11, 12 and generators 13, 14 in a thermal power plant. In addition, other equipment in the thermal power plant is omitted for easy understanding of the figure. The coal transported to the thermal power plant by the coal ship 1 is landed on the silo line conveyor 4A from the coal ship 1 by the continuous type coal unloader (unloader) 2 and is transported to the coal silo 4 until it is actually used. Temporarily stored.

  After storage in the coal silo 4, the coal is conveyed to the bunker 5 by the bunker row conveyor 4B. The coal transported to the bunker 5 is made into powder (pulverized coal) by the high-performance pulverized coal machine 6 and put into the boiler 7. The pulverized coal is combusted in the boiler 7 to convert the feed water 8 into steam 9 having high-temperature (for example, about 600 degrees) thermal energy. The steam 9 is converted into mechanical energy by the high-pressure turbine 10 and the intermediate-pressure turbine 11 to rotate them, and the generator 13 connected thereto is driven to generate electrical energy. Further, the residual heat is guided to the low-pressure turbine 12, and the generator 14 connected thereto is also driven.

  FIG. 2 is a diagram illustrating an example of the coal storage facility 100 including the coal silo 4 and the surrounding coal conveyance device. The coal silo 4 is surrounded by an outer wall 101.

  As shown in FIG. 2, the coal storage area of the coal silo 4 is divided into three rows of A, B, and C in the horizontal direction (Y direction in FIG. 2) (the symbols A, B, and C are on the roof of the outer wall 101). Each row is further divided into four parts a, b, c, and d in the vertical direction (X direction in FIG. 2) (the symbols of a, b, c, and d are shown in the lower part of the side surface of the outer wall 101). A total of 12 coal storage tanks 102 are provided. In addition, the number of the coal storage tanks 102 is not limited to this, It may be more or less.

  The partition walls forming each coal storage tank 102 include a main pillar 104 extending in the vertical direction (Z direction), and a plurality of intermediate pillars 105 that are narrower than the main pillar 104 extending in the vertical direction (Z direction) between adjacent main pillars 104 and horizontal. Directional ring beam 106.

  The coal storage facility 100 includes a receiving conveyor (coal receiving unit) 20 (20A, 20B, 20C) that receives the coal carried by the silo row conveyor 4A and transports the coal to the coal storage tank 102. The receiving conveyor 20A conveys coal to the A row coal storage tank 102, the receiving conveyor 20B conveys the coal to the B row coal storage tank 102, and the receiving conveyor 20C conveys the coal to the C row coal storage tank 102. Moreover, the receiving conveyor 20 is connected with the loading machine (coal carrying-in apparatus) 108 (108A, 108B, 108C) provided in the upper part of the coal storage tank 102, respectively. The loading machine 108A is connected to the receiving conveyor 20A, the loading machine 108B is connected to the receiving conveyor 20B, and the loading machine 108C is connected to the receiving conveyor 20C. The loader 108 can move in the vertical direction (X direction in the figure) on each coal storage tank 102, and can drop coal into one of the coal storage tanks 102.

  FIG. 3 is a diagram for explaining a coal carrying-out hopper 110, a dispensing machine 130 (dispensing device), and a hopper lower conveyor (coal conveying path) 140 provided in the lower part of the coal storage tank 102. A hopper generally means a funnel for flowing coal or the like, that is, a funnel-like device. In this embodiment, the hopper 110 is installed in the lower part of each coal storage tank 102. The hopper 110 includes a hopper wall configured in a lattice shape. Of the hopper walls 111, 112, 113, 114... Extending in the vertical direction (X direction in the figure), the odd-numbered hopper walls 111, 113,. And the lower part of the coal storage tank 102 has the space of the inverted trapezoid shape into which coal is poured into the bottom part by adjacent odd-numbered hoppers. In this space, even-numbered hopper walls 112, 114... Are disposed, and a gap 133 is formed between the lower-numbered hopper wall and the bottom of the hopper, and the hopper wall 112 is formed in the gap 133. , 114... Are provided. Further, the hopper walls 121, 122, 123... Extend in the lateral direction, and the strength of the vertical hopper walls 111, 112, 113, 114... Is secured and positioned by these lateral hopper walls 121, 122, 123. ing.

  The dispenser 130 includes a rotating member 131 having six claw members each having an arc shape and extending radially. As described above, the rotating member 131 is movable along the hopper walls 112, 114, and so on so that the claw members are disposed in the gaps 133 in the gaps 133 of the even-numbered hopper walls 112, 114, and so on. Is provided. Further, a slit 132 is provided at the bottom of the even-numbered hopper walls 112, 114... In the hopper 110 along the moving direction of the dispenser 130.

  Below the slit 132, a lower hopper conveyor 140 is installed. The dispenser 130 moves along the even-numbered hopper walls 112, 114... Inside the coal stored in the hopper while rotating the rotating member 131. As a result, the coal is discharged from the gap 133, passes through the slit 132, and is discharged to the lower hopper conveyor 140.

  A primary payout conveyor (coal carry-out path) 160 is arranged in the horizontal direction (Y direction in FIG. 2) below the conveyance end point of the lower hopper conveyor 140, and the coal discharged to the lower hopper conveyor 140 is the primary payout conveyor. It is passed to 160. A secondary delivery conveyor (coal delivery path) 161 provided perpendicular to the primary delivery conveyor 160 is disposed at the conveyance end point of the primary delivery conveyor 160. The coal carried out by the primary delivery conveyor 160 is converted by 90 degrees in the moving direction by the secondary delivery conveyor 161, and is conveyed in the X minus direction in FIG.

  The secondary payout conveyor 161 is inclined at a predetermined angle with respect to the horizontal from the middle of the path. A portion of the secondary payout conveyor 161 inclined at a predetermined angle is arranged outside the building of the coal storage tank 102 in the coal storage facility 100 and is covered with a transport path cover 164 so as not to be affected by external weather. It has been broken.

  FIG. 4 is an enlarged view of a portion of the secondary delivery conveyor 161 arranged outside the building. Two openings 165 are provided in the upper part (the portion on the Z plus side) of the transport path cover 164 of the secondary delivery conveyor 161, and ventilation units 170 are arranged in the openings 165, respectively.

  FIG. 5A is a side view of the ventilation unit 170, and FIG. 5B is a side sectional view of the ventilation unit 170. The ventilation unit 170 includes a lower cylinder member 171 having a horizontal (along the XY plane) cross-sectional rectangle, and an upper cylinder member having a horizontal (along the XY plane) circular section provided continuously from the upper end of the lower cylinder member 171. 172. The diameter of the upper cylinder member 172 is reduced upward from a continuous portion with the upper end of the lower cylinder member 171.

  A ceiling hood (shade-shaped member) 173 is disposed above the upper tube member 172 so as to cover the upper opening of the upper tube member 172. The ceiling hood 173 has a ceiling part 173a disposed above the upper cylinder member 172, and a side part 173b extending from the periphery of the ceiling part 173a so as to cover the upper part of the outer peripheral surface of the upper cylinder member 172. The ceiling hood 173 is supported by the upper cylinder member 172, but the air rising inside the upper cylinder member 172 changes direction along the inner surface of the ceiling hood 173 as indicated by an arrow A in FIG. The upper cylinder member so that it can flow downward (Z minus direction) through the exhaust port 174 formed between the inner surface of the side portion 173b of the ceiling hood 173 and the outer peripheral surface of the upper cylinder member 172. It is attached in a state in which an air flow path is secured between it and 172.

  A motor mounting plate 180 is provided substantially horizontally (along the XY plane) inside the lower cylinder member 171, and a drive motor 181 is disposed at the center of the motor mounting plate 180. The drive motor 181 is connected to a power supply unit (not shown). In the present embodiment, a fan 182 having three blades is attached to the rotation shaft of the drive motor 181.

  Further, a side hood (wind shield) 190 is attached to a boundary portion between the lower cylinder member 171 and the upper cylinder member 172. The side hood 190 has a rectangular bottom portion 191 that extends horizontally (along the XY plane) from the boundary portion, and four edge portions of the bottom portion 191 that are inclined upward with respect to the vertical direction. And four side wall portions extending in a direction away from the upper cylindrical member 172. The bottom portion 191 is supported by a support portion 175 extending from the lower cylinder member 171.

  A side wall portion of the side hood 190 has a front side wall portion 192 facing the lower side of the inclined secondary payout conveyor 161 and a rear side wall portion 193 facing the front side wall portion 192 and facing the upper side of the secondary payout conveyor 161. And two side wall portions 194 that connect the front side wall portion 192 and the rear side wall portion 193. The length H extending above the front side wall portion 192 is longer than the length h extending above the rear side wall portion 193.

  Returning to FIG. 2, a transport path switching unit 162 is provided at the transport end point of the secondary payout conveyor 161. The conveyance path switching unit 162 sends a coal transported from the secondary delivery conveyor 161 to the bunker 5 to be burned outside the coal storage facility 100, that is, in the boiler 7, in accordance with an instruction from the control device described later. (Coal supply path) 4B is switched over or switched to the recirculation conveyor 163 (coal return path) for storage in the coal storage tank 102 again.

  The recirculation conveyor 163 extends from the transfer path switching unit 162 and is connected to the receiving conveyor 20 so as to reload coal into the coal storage tank 102.

  Next, the conveyance control system 200 of the coal storage facility 100 will be described. FIG. 6 is a block diagram showing the transport control system 200. The conveyance control system 200 includes a monitoring device 210 that monitors the state of coal, a coal conveyance device 220 that moves coal, and a control device 230 that controls the monitoring device 210 and the coal conveyance device 220.

  The monitoring device 210 includes a timer 211 and a storage unit 212 that is connected to the timer 211 and stores the date and time when coal is carried in. When the coal in each coal storage tank 102 is carried in (including transshipment), time measurement by the timer 211 is started, and carry-in date / time data is sent to the storage unit 212. The storage unit 212 sends the storage date / time data to the control device 230.

  The monitoring device 210 includes a temperature sensor 213 that detects the temperature of the stored coal, and a temperature monitoring unit 214 that is connected to the temperature sensor 213 and monitors the temperature of the stored coal. The temperature sensor 213 is installed for each coal storage tank 102. The temperature data detected by the temperature sensor 213 is transmitted to the temperature monitoring unit 214. The temperature monitoring unit 214 sends this temperature data to the control device 230 together with data indicating which temperature sensor 213 of which coal storage tank 102.

  Furthermore, the monitoring device 210 includes a gas sensor 215 installed in each coal storage tank 102 and a gas concentration monitoring unit 216 that is connected to the gas sensor 215 and monitors the gas concentration. The gas sensor 215 can measure the CO concentration and is installed for each coal storage tank 102 (none is shown).

  The CO gas concentration data detected by the gas sensor 215 is transmitted to the gas concentration monitoring unit 216. The gas concentration monitoring unit 216 sends the CO gas concentration data to the control device 230 together with data indicating which gas sensor 215 of which coal storage tank 102.

  Based on the storage date / time data from the storage unit 212, the temperature data from the temperature monitoring unit 214, and the gas concentration data from the gas concentration monitoring unit 216, the control device 230 sends out coal or transfers (recycles) coal. Control what to do.

  The control device 230 may be a normal computer, and includes at least a CPU having a calculation function, a ROM in which a computer program for executing recirculation control is stored, a RAM as a work area, a storage unit 212, and a temperature monitoring unit 214. , An input / output control device connected to the gas concentration monitoring unit 216 and the coal conveyance device 220, and a monitor (none of which are shown).

  The coal conveyance device 220 is a device that sends coal to the outside or recirculates the coal based on the control of the control device 230 described above. The coal conveying device 220 includes the above-described dispensing machine 130, the lower hopper conveyor 140, the primary dispensing conveyor 160, the secondary dispensing conveyor 161, the ventilation unit 170, the conveyance path switching unit 162, the bunker row conveyor 4B, the recirculation conveyor 163, and the receiving conveyor. 20, the entire transport unit including the loader 108.

  Next, the operation | movement performed with the coal storage equipment 100 of this embodiment is demonstrated.

(First-in first-out)
First, a first-in first-out operation that is a basic operation in the above-described coal storage facility 100 will be described. In order to shorten the average storage period of coal in the coal storage tank 102 as much as possible, in principle, the coal is transferred into and out of the storage tank 102 by “first-in first-out”.

  The new coal carried by the silo row conveyor 4 </ b> A is guided to the coal storage tank 102 of the coal silo 4 by the receiving conveyor 20, dropped into the tank by the loader 108, and stored in the coal storage tank 102.

  When storage is started in the coal storage tank 102, the storage date of the coal that has been stored is managed by the storage unit 212 based on the time of the timer 211.

FIG. 7 is a flowchart showing external supply control of the control device 230.
In step 101 (hereinafter, step is represented by S), the control device 230 operates the dispenser 130 installed below the hopper 110 in the coal storage tank 102 having a long storage period described above. As a result, the rotating member 131 of the dispenser 130 rotates, and the coal is dispensed to the lower hopper conveyor 140 from the slit 132 formed under each coal storage tank 102 (see FIG. 3).

  In S <b> 102, the lower hopper conveyor 140 is operated to transport the coal that has fallen onto the lower hopper conveyor 140. In S103, the primary delivery conveyor 160, the secondary delivery conveyor 161, and the ventilation unit 170 are operated. The coal conveyed by the lower hopper conveyor 140 is transferred to the primary payout conveyor 160 and then transferred to the secondary payout conveyor 161.

  In the secondary delivery conveyor 161, the drive motor 181 of the ventilation unit 170 is driven, and the fan 182 rotates. When the fan 182 rotates, the air inside the transport path cover 164 rises inside the lower cylinder member 171 and the upper cylinder member 172 as shown in FIG. Then, the air rising inside the upper cylinder member 172 collides with the inner surface of the ceiling hood 173, along the side surface of the ceiling hood 173, between the inner surface of the ceiling hood 173 and the outer surface 172 a of the upper cylinder member 172. It flows downward through the exhaust port 174 and flows out through between the side hood 190 and the edge of the ceiling hood 173.

  For example, when the outside is a strong wind, a wind flow along the wall portion of the building tends to occur, and the wind may blow from below along the conveyance path cover 164. At this time, the wind blowing along the transport path cover 164 collides with the side surface of the lower cylinder member 171 of the ventilation unit 170 and flows upward along the side surface. Then, it flows along the side surface of the side hood 190 and flows away from the ventilation unit 170 as shown by an arrow B in FIG. By flowing in this way, external air does not flow from the exhaust port 174 between the inner surface of the ceiling hood 173 and the outer surface of the upper cylindrical member 172, and therefore does not flow into the transport path cover 164 and is transported. Sufficient ventilation of the air inside the road cover 164 is ensured.

  Returning to FIG. 7, in S <b> 104, the control device 230 connects the secondary payout conveyor 161 and the bunker row conveyor 4 </ b> B in the transport path switching unit 162, and operates the bunker row conveyor 4 </ b> B in S <b> 105. Thereby, the coal carried by the secondary delivery conveyor 161 is carried out to the outside, that is, carried on the bunker row conveyor 4 </ b> B, carried to the bunker 5, and burned in the boiler 7.

  Thus, according to the first-in first-out method of this embodiment, it is carried out from the coal storage tank 102 with a long storage period, and also from the coal stored previously also in the same coal storage tank 102 outside.

(Transshipment)
Next, the coal transshipment operation will be described. FIG. 8 is a flowchart showing the overall control including the coal transshipment control of coal. FIG. 9 is a flowchart showing the coal transshipment (recirculation) control.

  First, the coal is transported by the receiving conveyor 20 and dropped into the coal storage tank 102 by the loading machine 108 and stored. When the storage is started in the coal storage tank 102, the timer 211 starts counting. The storage date of the coal is stored in the storage unit 212 based on the time measured by the timer 211. The above is the same as in the first-in first-out case.

  As shown in FIG. 8, the control device 230 first reads storage date / time data from the storage unit 212 after the coal is loaded in S201.

  In S202, it is determined whether or not the storage period exceeds the first period (1.5 months in the present embodiment). If not exceeded (S202, No), the process proceeds to S203. If it exceeds (S202, Yes), it will progress to S210 mentioned later, and the control apparatus 230 will perform the transshipment control shown in FIG. 9 so that the coal storage facility 100 may transship coal.

  In the transshipment control of FIG. 9, the dispenser 130 installed in the lower part of the hopper 25 in the coal storage tank 102 is operated in S301, similarly to the external supply control of the control device 230. As a result, the rotating member 131 of the dispenser 130 rotates, and the coal is delivered to the lower hopper conveyor 140 from the slit 132 formed under each coal storage tank 102. In S302, the lower hopper conveyor 140 is operated to transport the coal on the lower hopper conveyor 140.

  In S303, the primary delivery conveyor 160, the secondary delivery conveyor 161, and the ventilation unit 170 are operated. The coal is transported by the lower hopper conveyor 140, and the coal is transferred to the primary payout conveyor 160 and then transferred by the secondary payout conveyor 161.

  As in the first-in first-out case, in the secondary payout conveyor 161, the drive motor 181 of the ventilation unit 170 is driven and the fan 182 rotates. When the fan 182 rotates, the air inside the transport path cover 164 rises inside the lower cylinder member 171 and the upper cylinder member 172 as shown in FIG. Then, the air rising inside the upper cylinder member 172 collides with the inner surface of the ceiling hood 173, along the side surface of the ceiling hood 173, between the inner surface of the ceiling hood 173 and the outer surface 172 a of the upper cylinder member 172. It flows downward through the exhaust port 174 and flows out through between the side hood 190 and the edge of the ceiling hood 173.

  For example, there is a case where the outside is a strong wind and the wind is blowing from below along the conveyance path cover 164. At this time, the wind blowing along the transport path cover 164 collides with the side surface of the lower cylinder member 171 of the ventilation unit 170 and flows upward along the side surface. Then, it flows along the side surface of the side hood 190 and flows away from the ventilation unit 170 as shown by an arrow B in FIG. By flowing in this way, external air does not flow from the exhaust port 174 between the inner surface of the ceiling hood 173 and the outer surface 172a of the upper cylinder member 172, and therefore does not flow into the conveyance path cover 164, Sufficient ventilation of the air inside the conveyance path cover 164 is ensured.

  In S <b> 304, the control device 230 connects the secondary delivery conveyor 161 and the recirculation conveyor 163 in the transport path switching unit 162. Thereby, coal is conveyed by the recirculation conveyor 163, and is conveyed to the receiving conveyor 20. FIG.

  In S <b> 305, the control device 230 operates the recirculation conveyor 163 and the receiving conveyor 20. The coal carried by the recirculation conveyor 163 is also carried to the loader 108 and returned to the original coal storage tank 102 in the same manner as the newly loaded coal carried by the silo line conveyor 4A. In addition, when returning to the original coal storage tank 102, there exists an advantage that the efficiency of management of the stored coal can be aimed at. However, it is not limited to this, and can be returned to another coal storage tank 102.

  Even if the “first-in first-out” order does not occur, when the storage period exceeds a certain period, the transshipment of coal is performed for the following reason.

  In the present embodiment, in principle, the above-mentioned “first-in first-out” is adopted in the use of coal, and the old coal in the coal storage tank 102 is put out first to shorten the average coal storage period. However, when the amount of coal stored increases, the storage period becomes longer, and when stored for a long time, the temperature of coal may increase. For this reason, when storing beyond the first period (for example, 1.5 months), which is a certain period after coal is brought in, it is once transported on the conveyor even if the order of use has not yet come. This is because it is preferable to air-cool.

  Thus, the temperature of coal can be lowered | hung by moving the storage coal whose temperature rose by the belt conveyor. Coal does not generate heat in the absence of air at all, so it does not generate heat, but it is most likely to generate heat with a slight flow of air. However, if it is transported using a conveyor or the like and brought into contact with a large amount of air, the amount of heat dissipated becomes larger than the amount of heat generated by coal, and the temperature of coal decreases. Therefore, the coal which has been stored in the silo and once heated is discharged outside the silo using a conveyor and is recirculated back into the silo for air cooling.

  In addition, the 1.5 months adopted as the first period in the present embodiment are the coal heating temperature actual value of the applicant's Ishikawa Thermal Power, the coal with a high heating rate at the Misumi power station (for example, Blair sole charcoal) ) Is the value obtained from the actual temperature rise value.

  Returning to FIG. 8, if the storage period does not exceed 1.5 months in S202, the process proceeds to S203. In S <b> 203, the control device 230 reads temperature data from the temperature monitoring unit 214 together with data indicating which temperature sensor 213 of which coal storage tank 102.

  In S204, it is determined whether or not the hopper top temperature th exceeds a first temperature (for example, 45 degrees). If so, the process proceeds to S210. If not, the process proceeds to S205. In S205, it is determined whether or not the silo internal temperature ts exceeds a second temperature (for example, 55 degrees). If so, the process proceeds to S210. If not, the process proceeds to S206.

  Thus, the hopper top temperature th and the silo internal temperature ts are measured for the following reason.

  As described above, when stored for a long period of time, the temperature of the coal may increase. In S202, it is determined whether or not the first period has been exceeded. However, even if it does not exceed the first period, the coal temperature may increase. For this reason, the hopper top temperature th is monitored, and when the temperature reaches 45 degrees (Celsius, the same applies hereinafter), the process proceeds to S210 to perform transshipment. Further, even if the hopper top temperature th does not become 45 degrees, when the silo internal temperature ts becomes 55 degrees, the process proceeds to S210, and transshipment is performed.

  The reason why the first temperature at the hopper top temperature th is 45 degrees and the second temperature at the silo internal temperature ts is 55 degrees is as follows.

  As the properties of the stored coal, when it reaches the oxidation start temperature (about 60 degrees), it enters the low temperature oxidation zone and gradually begins to heat up, and when it reaches the evaporation start temperature (about 70 degrees), the low temperature oxidation zone ends and the coal moisture gradually increases. Evaporation begins, and when it reaches a red hot start temperature (about 85 ° C.), the coal moisture evaporates, and when it is left standing, it quickly becomes red hot.

  The hopper top temperature th is a temperature measured by temperature sensors 213 (for example, six points) installed at a plurality of locations on the top. The hopper top temperature in the coal stored in the coal storage tank 102 is generally lower than the internal temperature of the coal storage tank 102. For this reason, the hopper top temperature th is set to 45 degrees as a warning temperature before the internal temperature of the coal storage tank 102 reaches the red heat start temperature, the evaporation start temperature, and the red heat start temperature.

  The silo internal temperature ts is a temperature obtained by measuring the coal temperature with a plurality of (for example, five points) wire thermometers suspended inside the coal inside the silo tank. 55 degree | times which is 2nd temperature is the temperature calculated | required from the temperature rise of coal in the time required for transshipment (recirculation) with respect to the red hot start temperature of coal, and the transshipment time.

  Returning to FIG. 8, if the silo internal temperature ts does not exceed 55 degrees in S205, the process proceeds to S206. In S206, the CO gas concentration data is read from the gas concentration monitoring unit 216 together with the data indicating which gas sensor of which coal storage tank 102.

  In S207, it is determined whether or not the CO gas concentration exceeds a first concentration (5 ppm in this embodiment) indicating the start of oxidation. If it exceeds, the process proceeds to S208, the monitoring is strengthened, and the process further proceeds to S209. If not, the process proceeds directly to S209.

  In S208, monitoring for coal heat generation is strengthened. Surveillance is silo monitoring and uses 12 ITV (Industrial Television) (not shown) at a fixed date every day to check the 12 tanks in sequence, and then monitor once a day. The patrol. In S209, the confirmation work in the tank by the ITV and the patrol frequency of the monitoring staff are performed more frequently.

  In S209, it is determined whether or not the CO gas concentration exceeds the second concentration (20 ppm in this embodiment) that requires immediate transshipment. If exceeded, the process proceeds to S2101. If not exceeded, the process returns to S201.

  The first concentration of 5 ppm is a detection limit concentration of the gas sensor 215, and is a concentration that indicates that the oxidation of coal has begun to a slight extent. If 5 ppm is detected, the monitoring reinforcement system is entered here. The second CO concentration of 20 ppm is a CO concentration indicating that oxidation of coal is taking place in earnest from past performance data. When 20 ppm is detected, coal reloading is started immediately.

  Coal temperature rise initially occurs locally rather than uniformly in stored coal, and then the temperature rise gradually spreads. Therefore, it may not be possible to reliably detect an increase in the temperature of coal by simply measuring ten thousand tons of coal per tank using a thermometer for temperature monitoring.

  However, coal always generates carbon monoxide (CO) as the temperature rises. Since CO is lighter than air, it collects at the top of the coal silo. Therefore, by installing the gas sensor 215 on the upper part of the coal storage tank 102 and monitoring the CO concentration, local heat generation of coal can be detected at an early stage.

  The gas sensor 215 for measuring the CO concentration is installed in advance in the coal silo 4 in response to a request from the Industrial Safety Law for ensuring safety to the human body, and uses this.

  In S211, it is determined whether or not the coal transshipment has been completed. If not completed, the process returns to S210, and the coal transshipment operation is continued. If completed, the process returns to S201.

  As described above, the coal storage facility 100 according to the present embodiment covers the secondary delivery conveyor 161 that transports coal, the transport path cover 164 that covers the secondary delivery conveyor 161, and has an opening 165 on the circumferential surface, and an opening. A ventilation unit 170 attached to the portion 165. The ventilation unit 170 is disposed inside the cylindrical members 171 and 172 and the cylindrical members 171 and 172 extending upward from the opening 165 and is driven by the drive unit. The fan 182 rotated by force, the ceiling part 173a disposed above the cylindrical members 171 and 172, and the upper part of the outer peripheral surface of the cylindrical members 171 and 172 continuously extend from the periphery of the ceiling part 173a. A ceiling hood 173 having a side portion 173b and having an exhaust port 174 formed between the side portion 173b and the outer peripheral surfaces of the cylindrical members 171 and 172; 4, a side hood 190 having a bottom 191 disposed below the exhaust port 174 and a front side wall 192 extending continuously from the bottom 191 toward the side 173b of the ceiling hood 173, Is provided.

  The coal transported on the secondary payout conveyor 161 may have an increased temperature or generate CO. For this reason, the ventilation path 170 is provided in the conveyance path cover 164 which covers the secondary delivery conveyor 161, and the air in the conveyance path cover 164 is exhausted outside. The ventilation unit 170 ventilates the air inside the secondary delivery conveyor 161, promotes a decrease in the coal temperature, and reduces the CO concentration in the transport path cover 164. Here, when the conveyance path cover 164 is not provided, or when the outside of the conveyance path cover 164 is a strong wind or the like, the wind flows back through the ventilation unit 170 and the air flows into the conveyance path cover 164, and the conveyance path cover The air in 164 may not be exhausted well. However, according to the present invention, since the exhaust port 174 of the ventilation unit 170 is covered with the side hood 190, the backflow of the wind entering the ventilation unit 170 through the exhaust port 174 is prevented. Thereby, the exhaust of the air of the conveyance path cover 164 is favorably performed.

  Further, in the coal storage facility 100 of the present embodiment, the bottom 191 extends horizontally outward from the outer peripheral surface of the cylindrical members 171 and 172, and the side wall 192 is inclined with respect to the vertical direction from the outer edge of the bottom 191. In this state, it extends in the direction away from the cylindrical members 171 and 172 upward.

  When the wind blowing along the transport path cover 164 collides with the cylindrical members 171 and 172 of the ventilation unit 170, the wind blows up from below along the outer peripheral surface of the cylindrical members 171 and 172. At this time, when the side wall 192 of the side hood 190 is inclined with respect to the vertical direction and extends upward in a direction away from the cylindrical members 171, 172, the wind blown up from the bottom is the cylindrical member. 171 and 172 are guided away.

  Further, in the present embodiment, the secondary delivery conveyor 161 is disposed to be inclined with respect to the horizontal direction, a part of the side wall part 192 faces the lower side of the secondary delivery conveyor 161, and the other part of the side wall part 192 is a second part. The length that faces the upper side of the next delivery conveyor 161 and extends above a part of the side wall part 192 is longer than the length that extends above the other part of the side wall part 192.

  When the secondary delivery conveyor 161 is arranged to be inclined with respect to the horizontal direction, the wind easily blows from the bottom along the transport path cover 164 and faces the lower side of the secondary delivery conveyor 161 in the ventilation unit 170. The wind collides with the other side. Increasing the length of the side wall portion 192 that extends upward from the portion facing the lower side of the secondary payout conveyor 161 can effectively prevent the wind blown from below from flowing into the exhaust port 174.

  As described above, various modifications and changes are possible without being limited to the embodiments described above, and these are also within the scope of the present invention.

  4: Coal silo, 100: Coal storage facility, 102: Coal storage tank, 160: Primary delivery conveyor, 161: Secondary delivery conveyor (conveyance path), 164: Conveyance path cover, 165: Opening, 170: Ventilation unit, 171 : Lower cylinder member, 172: Upper cylinder member, 173: Ceiling hood, 173a: Ceiling part, 173b: Side part, 174: Exhaust port, 181: Drive motor, 182: Fan, 190: Side part hood, 191: Bottom part 192: Front side wall part, 193: Rear side wall part, 194: Side wall part, 230: Control device

Claims (3)

A transport path for transporting coal;
A transport path cover that covers the transport path and is provided with an opening on the peripheral surface;
A ventilation unit attached to the opening,
The ventilation unit is
A cylindrical member extending upward from the opening;
A fan disposed inside the cylindrical member and rotated by the driving force of the driving unit;
A ceiling portion disposed above the tubular member; and a side portion extending continuously from the periphery of the ceiling portion so as to cover an upper portion of the outer peripheral surface of the tubular member, and the side portion and the tubular member A cap-shaped member in which an exhaust port is formed between the outer peripheral surface, and
A coal provided with a bottom portion disposed opposite to the exhaust port and disposed on the lower side of the exhaust port, and a windbreak portion having a side wall portion extending continuously from the bottom portion toward the side portion of the cap member. Storage facilities. The bottom portion extends horizontally outward from the outer peripheral surface of the tubular member,
The side wall portion extends in a direction away from the cylindrical member upward in a state inclined with respect to the vertical direction from the outer edge portion of the bottom portion.
The coal storage facility according to claim 1. The conveyance path is disposed to be inclined with respect to the horizontal direction,
One of the side walls faces the lower side of the conveyance path,
The other side of the side wall faces the upper side of the conveyance path, and the length of the portion of the side wall facing the lower side extends upward. The length of the portion of the side wall facing the upper side extends upward. Longer than
The coal storage facility according to claim 1 or 2.

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