JP2013178037A - Solid fuel grinding device and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent large quantities of impalpable powder fuel from being supplied to a burner part by collectively grinding large quantities of solid fuel accumulated at a center part of a rotary table when the solid fuel containing much water is ground.SOLUTION: A control part 50 of a solid fuel grinding device 1 controls to pause supply of the solid fuel by a fuel supply part 36 without pausing ventilation of primary oxidative gas to a roller by a primary oxidative gas fan 90 when a start of grinding of the solid fuel is not detected even if a given time elapses from a start of supply of the solid fuel by the fuel supply part 36, and to resume the supply of the solid fuel by the fuel supply part 36 in response to a fact that the start of grinding of the solid fuel is detected.

Description

  The present invention relates to a solid fuel pulverizer and a control method for the solid fuel pulverizer.

Conventionally, a burner that pulverizes solid fuel such as coal supplied to a rotary table with a roller, classifies the pulverized solid fuel into pulverized fuel smaller than a predetermined particle size, and burns the classified pulverized fuel into the pulverized fuel. There is known a solid fuel pulverizer for supplying to a section (see, for example, Patent Document 1).
The solid fuel pulverizer supplies an oxidizing gas such as air containing an oxidant to the pulverizing unit to raise and classify the pulverized solid fuel and supply an oxidizing gas mixed with the finely divided fuel. It supplies to a burner part through a flow path.
In the solid fuel crusher, the fuel supply unit supplies solid fuel to the central part of the rotary table, and the solid fuel is moved from the central part to the outer peripheral part by utilizing the centrifugal force when the rotary table rotates, and rotates. The solid fuel is pulverized using a plurality of rollers arranged so as to press the outer periphery of the table.

JP 2001-29835 A

When the fuel supply unit supplies solid fuel such as coal containing a lot of moisture to the center of the turntable, the solid fuel accumulates in the center of the turntable, and the centrifugal force generated when the turntable rotates is applied to the solid fuel. Even if it adds, the problem that it becomes difficult to move a solid fuel to the outer peripheral part of a rotary table generate | occur | produces.
This problem is particularly noticeable at the time of starting up the boiler. When the primary oxidizing gas supplied to the solid fuel pulverization unit is preheated using the heat of the exhaust gas from the boiler provided with the burner unit, the boiler is not sufficiently warmed when the boiler is started. This is because the preheating of the oxidizing gas is insufficient. In a turntable to which a primary oxidizing gas that has not been sufficiently preheated is supplied, a solid fuel containing a large amount of water tends to accumulate at the center of the turntable.
Then, when solid fuel is further supplied from the fuel supply unit in a state where the solid fuel is accumulated at the center of the rotary table, and then a large amount of solid fuel moves from the center of the rotary table to the outer periphery, a large amount of fine powder There is a problem that fuel is supplied to the burner section, and the steam temperature and steam pressure of the boiler rapidly increase.

  The present invention has been made in view of such circumstances, and when pulverizing solid fuel such as coal containing a large amount of water, a large amount of solid fuel accumulated in the center of the rotary table is pulverized together. An object of the present invention is to provide a solid fuel pulverization apparatus capable of preventing a large amount of pulverized fuel from being supplied to a burner section and a control method thereof.

In order to achieve the above object, the present invention employs the following means.
The solid fuel pulverization apparatus according to the present invention is pressed by a rotary table that rotates by a driving force from a driving source, a fuel supply unit that supplies solid fuel to a central part of the rotary table, and an outer peripheral part of the rotary table, A roller for pulverizing the solid fuel that moves from the central portion to the outer peripheral portion as the rotary table rotates, and a fine powder that is provided above the rotary table and that is pulverized by the roller with a particle size smaller than a predetermined particle size. A classification unit for classifying into fuel, a primary blowing unit for blowing a primary oxidizing gas for supplying the solid fuel crushed by the roller to the classification unit, and a solid fuel in which the roller is supplied by the fuel supply unit A detector that detects whether or not pulverization has started, supply of the solid fuel by the fuel supply unit, and the primary oxidizing gas to the roller by the primary air blowing unit A control unit that controls the blowing of air, and the control unit, based on the elapsed time from the start of supply of the solid fuel by the fuel supply unit and detection information of the start of pulverization of the solid fuel by the detection unit, It is characterized in that a state of blowing the primary oxidizing gas to the roller by a primary blowing unit and a supply state of the solid fuel by the fuel supply unit are controlled.

According to the solid fuel pulverization apparatus according to the present invention, the primary oxidization property to the roller by the primary air blowing unit based on the elapsed time from the start of the supply of the solid fuel by the fuel supply unit and the detection information of the solid fuel pulverization start by the detection unit. The gas blowing state and the solid fuel supply state by the fuel supply unit are controlled.
By doing so, even if solid fuel such as coal containing a lot of water is accumulated in a large amount in the central portion of the rotary table, the blowing state of the primary oxidizing gas to the roller and the supply of the solid fuel The state can be appropriately controlled, and a large amount of pulverized fuel can be prevented from being supplied to the burner unit.

  In the solid fuel pulverization apparatus according to the first aspect of the present invention, the control unit starts the pulverization of the solid fuel even if a predetermined time has elapsed since the control unit started the supply of the solid fuel by the fuel supply unit. Is not detected, the supply of the solid fuel by the fuel supply unit is stopped without stopping the blowing of the primary oxidizing gas to the roller by the primary blowing unit, and the detection unit pulverizes the solid fuel The control is performed so that the supply of the solid fuel by the fuel supply unit is resumed in response to the detection of the start of fuel.

  According to the solid fuel pulverization apparatus of the first aspect of the present invention, when the start of pulverization of the solid fuel is not detected even after a predetermined time has elapsed since the supply of the solid fuel by the fuel supply unit is started, the primary air blowing unit The supply of the solid fuel by the fuel supply unit is stopped without stopping the blowing of the primary oxidizing gas to the roller. Further, the supply of the solid fuel by the fuel supply unit is resumed in response to the detection of the start of pulverization of the solid fuel thereafter.

  By doing in this way, it prevents solid fuel, such as coal containing much water, from accumulating in the center part of a turntable, and restarts supply of the solid fuel by a fuel supply part at an appropriate timing. be able to. Therefore, when pulverizing a solid fuel containing a lot of moisture, it is possible to prevent a large amount of solid fuel accumulated in the center of the rotary table from being pulverized together and supplying a large amount of pulverized fuel to the burner unit. it can.

  The solid fuel pulverization apparatus according to the second aspect of the present invention includes a receiving unit that receives an instruction to resume the supply of the solid fuel by an operator, and the control unit stops the supply of the solid fuel by the fuel supply unit. When the detection unit detects the start of pulverization of the solid fuel and the reception unit receives the supply restart instruction, control is performed to restart the supply of the solid fuel by the fuel supply unit. And

  According to the solid fuel pulverization apparatus of the second aspect of the present invention, when solid fuel pulverization is detected after the supply of solid fuel by the fuel supply unit is stopped, and further an instruction to resume the supply of solid fuel is received from the operator Then, the supply of the solid fuel by the fuel supply unit is resumed. By doing so, it is possible to prevent the fuel supply unit from restarting the supply of solid fuel until the operator confirms the state of solid fuel pulverization by visual observation or the like and the operator instructs the supply restart. it can.

  In the solid fuel pulverization apparatus according to the third aspect of the present invention, the control unit detects the start of pulverization of the solid fuel after the control unit stops the supply of the solid fuel by the fuel supply unit, and Control is performed so that the supply of the solid fuel by the fuel supply unit is resumed when a predetermined standby time has elapsed. In this way, even when the detection unit detects the start of pulverization of the solid fuel after stopping the supply of the solid fuel, a predetermined waiting time until the operation of the boiler or the like is stabilized elapses. Until then, the supply of the solid fuel by the fuel supply unit can be prevented from being resumed.

  In the solid fuel pulverization apparatus according to the fourth aspect of the present invention, the drive source is an electric motor, and the detection unit detects the roller when a current value of a current supplied to the electric motor exceeds a predetermined value. It is detected that pulverization of the solid fuel supplied by the fuel supply unit is started. In this way, it is possible to detect the start of pulverization of the solid fuel based on the current value of the current supplied to the electric motor that rotates the rotary table.

  In the solid fuel pulverization apparatus according to the fifth aspect of the present invention, the detection unit pulverizes the solid fuel supplied by the fuel supply unit when the roller is separated from the rotary table by a predetermined distance or more. It is detected that it has started. In this way, it is possible to detect the start of pulverization of the solid fuel based on the position of the roller with respect to the rotary table.

  A control method of a solid fuel crusher according to the present invention includes a rotary table that is rotated by a driving force from a drive source, a fuel supply unit that supplies solid fuel to a central portion of the rotary table, and A roller that crushes the solid fuel that is pressed and moves from the central portion to the outer peripheral portion as the turntable rotates, and a solid fuel that is provided above the turntable and crushed by the roller has a predetermined particle size. A control method for a solid fuel pulverizing apparatus, comprising: a classification unit for classifying into smaller pulverized fuel; and a primary blowing unit for blowing a primary oxidizing gas for supplying the solid fuel crushed by the roller to the classification unit. A supply start step for starting the supply of the solid fuel by the fuel supply unit, and a predetermined time after the supply of the solid fuel by the supply start step is started. A first detection step for detecting whether or not the roller has started to pulverize the solid fuel supplied by the fuel supply unit until the first detection step, and the first detection step detects the start of pulverization of the solid fuel. A supply stop step of stopping the supply of the solid fuel by the fuel supply unit without stopping the blowing of the primary oxidizing gas to the roller by the primary blower unit, and the solid by the supply stop step A second detection step for detecting whether or not the roller starts pulverization of the solid fuel supplied by the fuel supply unit after the supply of fuel is stopped; and the second detection step is for pulverization of the solid fuel. A supply restarting step for controlling to restart the supply of the solid fuel by the fuel supply unit in response to the detection of the start.

  According to the control method of the solid fuel pulverization apparatus according to the present invention, when the start of solid fuel pulverization is not detected even after a predetermined time has elapsed since the supply of solid fuel by the fuel supply unit is started, The supply of the solid fuel by the fuel supply unit is stopped without stopping the blowing of the primary oxidizing gas to the roller. Further, the supply of the solid fuel by the fuel supply unit is restarted in response to the detection of the start of the pulverization of the solid fuel thereafter.

  By doing in this way, it prevents solid fuel, such as coal containing much water, from accumulating in the center part of a turntable, and restarts supply of the solid fuel by a fuel supply part at an appropriate timing. be able to. Therefore, when pulverizing solid fuel such as coal containing a lot of moisture, a large amount of solid fuel accumulated in the center of the rotary table is crushed together to prevent a large amount of fine fuel from being supplied to the burner section. can do.

  According to the present invention, when solid fuel such as coal containing a lot of water is pulverized, a large amount of solid fuel accumulated in the center of the rotary table is pulverized together, and a large amount of pulverized fuel is supplied to the burner portion. Therefore, it is possible to provide a solid fuel pulverization apparatus and a control method thereof.

It is a lineblock diagram showing the solid fuel crusher of a 1st embodiment. It is sectional drawing which shows the solid fuel grinding | pulverization part of 1st Embodiment. It is sectional drawing which shows the roller and roller support part of 1st Embodiment. It is a flowchart which shows the process of the control part of 1st Embodiment. It is a flowchart which shows the process of the control part of 1st Embodiment. It is a flowchart which shows the process of the control part of 2nd Embodiment. It is a flowchart which shows the process of the control part of 2nd Embodiment. It is a figure which shows the driving | operation result of the solid fuel crushing apparatus of 1st Embodiment, (a) shows the air volume of a primary oxidizing gas fan, (b) shows the exit temperature of a solid fuel crushing part, (c) is The fuel supply amount from the fuel supply unit is shown, and (d) shows the steam temperature. It is a figure which shows the driving | operation result of the solid fuel grinding | pulverization apparatus of the comparative example of 1st Embodiment, (a) shows the air volume of a primary oxidizing gas fan, (b) shows the exit temperature of a solid fuel grinding | pulverization part, c) shows the amount of fuel supplied from the fuel supply unit, and (d) shows the vapor temperature.

[First Embodiment]
Hereinafter, the solid fuel crusher of 1st Embodiment is demonstrated using FIG. FIG. 1 is a configuration diagram illustrating a solid fuel crusher according to a first embodiment.
The solid fuel pulverization apparatus 1 according to the first embodiment includes a fuel pulverization unit 10, a fuel supply unit 36 that supplies solid fuel to the fuel pulverization unit 10, and an oxidation that preheats a primary oxidizing gas blown to the fuel pulverization unit 10. And a primary oxidizing gas fan 90 that blows the oxidizing gas preheated by the oxidizing gas preheater 40 to the fuel pulverization unit 10 as a primary oxidizing gas. The solid fuel pulverizing apparatus 1 includes a pulverized fuel boiler 60 including a burner unit 110 that combusts the pulverized fuel supplied from the fuel pulverizing unit 10. The solid fuel pulverization apparatus 1 includes a control unit 50 that controls each part of the solid fuel pulverization apparatus 1 such as the fuel pulverization unit 10, the fuel supply unit 36, the pushing fan 80, and the primary oxidizing gas fan 90.

Next, the flow of the oxidizing gas in the solid fuel crusher 1 will be described.
The oxidizing gas outside the solid fuel crusher 1 flows from the flow path 100 by the pushing fan 80. A part of the oxidizing gas flowing in from the flow path 100 by the pushing fan 80 is preheated from the flow path 101 via the oxidizing gas preheater 40, and the preheated oxidizing gas passes through the flow path 109 to the burner section. 110. The oxidizing gas supplied to the burner unit 110 via the flow path 109 is used as the secondary oxidizing gas for the combustion of the pulverized fuel in the burner unit 110.

  Another part of the oxidizing gas that has flowed from the flow path 100 by the pushing fan 80 flows into the primary oxidizing gas fan 90 and is blown to the flow path 102 a by the primary oxidizing gas fan 90. Part of the oxidizing gas blown to the channel 102 a is preheated by the oxidizing gas preheater 40, and the preheated oxidizing gas joins the channel 102 b through the channel 103. Another part of the oxidizing gas blown to the flow path 102a is blown to the flow path 102b without passing through the oxidizing gas preheater 40. At the position where the flow path 102a and the flow path 103 merge, the oxidizing gas preheated by the oxidizing gas preheater 40 and the oxidizing gas not preheated by the oxidizing gas preheater 40 are mixed, and the flow path 102b. Then, the air is blown to the fuel crushing unit 10.

  The oxidizing gas passing through the flow path 102a and the oxidizing gas passing through the flow path 103 are mixed at the joining position and then flow into the fuel pulverization unit 10. The oxidizing gas (primary oxidizing gas) that has flowed into the fuel pulverization unit 10 is mixed with the pulverized fuel in the fuel pulverization unit 10 and supplied to the burner unit 110 through the supply flow path 105 as will be described later. In the burner unit 110, the mixed oxidizing gas of the fine fuel supplied from the fuel pulverizing unit 10 is used as the primary oxidizing gas, and the oxidizing gas supplied from the oxidizing gas preheater 40 is used as the secondary oxidizing gas. Is burned.

  In the boiler 60, heat exchange is performed by giving heat generated by the combustion of the finely pulverized fuel in the burner unit 110 to steam flowing through a steam pipe (not shown). The steam having a high temperature is used as power for rotating a steam turbine (not shown). From the boiler 60, high-temperature combustion gas is supplied to the oxidizing gas preheater 40 via the flow path 112 and then discharged to the outside of the solid fuel crusher 1 via the flow path 111. The reason why the high-temperature combustion gas is supplied to the oxidizing gas preheater 40 via the flow path 112 is that the high-temperature combustion gas is used as a heat source for preheating the oxidizing gas.

Next, the fuel pulverization unit 10 will be described in detail with reference to FIG. FIG. 2 is a cross-sectional view showing the solid fuel pulverizing portion of the first embodiment.
The fuel crushing unit 10 includes a hollow housing 11 having a substantially cylindrical shape, a rotary table 12 that is disposed in a lower portion of the housing 11 and that is rotatably attached to an axis extending in the vertical direction, and an outer periphery of the rotary table 12. A roller (crushing unit) 13 that crushes solid fuel in cooperation with the rotary table 12, a drive unit 14 that rotates the rotary table 12, and a power supply device 200 are provided. The drive unit 14 includes an electric motor and a speed reducer, and a speed reducer that reduces the rotational speed of the electric motor is connected to the central portion 12 a of the rotary table 12 via a rotary shaft 15. The drive unit 14 is supplied with electric power from the power supply device 200 via the power supply cable 200b, and the electric motor is operated by the supplied electric power. The power supply apparatus 200 includes a detection unit (current detection sensor) 200a that detects a current value of a current supplied to the drive unit 14 (current flowing through the electric motor). When the control unit 50 instructs the power supply device 200 to detect current, the power supply device 200 notifies the control unit 50 of the current value detected by the detection unit 200a.

  The fuel pulverization unit 10 supplies a classification unit 16 disposed in the upper part of the housing 11 and a solid fuel that is attached so as to penetrate the upper end of the housing 11 and is supplied from the upper part to the central part 12 a of the rotary table 12. And a solid fuel input unit 17. The lower end portion of the housing 11 communicates with the flow path 102b, and the primary oxidizing gas flows into the lower end portion of the housing 11 from the flow path 102b. The housing 11 is fixed to the upper surface of a pair of rectangular parallelepiped concrete blocks 19 installed on the floor 18.

  In FIG. 2, only one roller 13 is shown, but a plurality of rollers 13 are arranged at regular intervals in the outer circumferential direction so as to press the outer circumferential portion 12 b of the rotary table 12. For example, three rollers 13 are arranged on the outer peripheral portion 12b with an angular interval of 120 °. In this case, the portions where the three rollers 13 are in contact with the outer peripheral portion 12 b of the rotary table 12 (the portions to be pressed) are equidistant from the central portion 12 a of the rotary table 12.

  At a plurality of locations outside the turntable 12, there are provided oxidizing gas outlets 32 through which the primary oxidizing gas flowing from the flow path 102b flows out into the space above the turntable 12 in the housing 11. A vane 33 is installed above the oxidizing gas outlet 32, and the vane 33 gives a turning force to the primary oxidizing gas blown out from the oxidizing gas outlet 32. The primary oxidizing gas to which the turning force is given by the vane 33 becomes an air current as shown by an arrow in FIG. 2 and guides the solid fuel crushed on the rotary table 12 to the classifying unit 16 above the housing 11. Of the pulverized solid fuel mixed with the primary oxidizing gas, the pulverized product with a large particle size falls without reaching the classification unit 16 and is returned to the turntable 12 again.

  The classifying unit 16 includes a blade that rotates about the cylindrical axis of the substantially cylindrical housing 11. The pulverized product of the solid fuel that has reached the classification unit 16 flows only fine fuel having a particle size smaller than a predetermined particle size into the blade due to the relative balance between the centrifugal force and centripetal force generated by the flow of the rotating blade and the primary oxidizing gas. And flows out from the outlet 34. The outlet 34 communicates with the supply channel 105.

  Next, the structure of the roller 13 and the roller support part 20 is demonstrated using FIG. The roller 13 is supported on the housing 11 by a roller support portion 20. The roller support portion 20 includes a support shaft 21 to which the roller 13 is attached, a main body 22 that holds the support shaft 21, a rotary shaft 23 that is fixedly attached to a side portion of the main body 22, and an upper surface that extends upward. The arm 24 is attached so as to be present, and the protrusion 25 is provided on the lower surface of the main body 22 so as to protrude downward.

A hollow hub 26 having a substantially cylindrical shape is attached to the center of the roller 13. The roller 13 is attached to the tip end portion of the support shaft 21 via the hub 26. Therefore, the roller 13 is rotatable in the circumferential direction around the support shaft 21.
The rotary shaft 23 is arranged so that the axis is substantially horizontal and extends in the tangential direction of the circular shape of the rotary table 12. The roller support portion 20 is rotatable about the rotation shaft 23, and the distance of the roller 13 relative to the outer peripheral portion 12 b of the rotary table 12 changes by rotating about the rotation shaft 23.

  A load applying portion 27 that presses the upper end portion of the arm 24 is attached to the housing 11. The load adding portion 27 includes an intermediate piston 28 attached to the housing 11 so as to be movable in the longitudinal direction, and a hydraulic load portion 29 attached to the outer periphery of the housing 11 and pressing the outer end portion of the intermediate piston 28. The inner end portion of the intermediate piston 28 is connected to the outer peripheral side of the upper end portion of the arm 24. The load adding portion 27 causes the roller support portion 20 to swing around the rotation shaft 23 by moving the intermediate piston 28 in the longitudinal direction by the hydraulic load portion 29.

  The protrusion 25 abuts against the stopper 30 when the roller support 20 swings to a certain position around the rotation shaft 23. The stopper 30 functions as a limiting member that limits the amount of movement of the roller 13 in the direction in which the rotary table 12 is pressed. The stopper 30 is a screw member in which a male screw is carved on the outer peripheral surface, and is screwed with a female screw carved on the inner circumference of the holding portion 31 attached so as to penetrate the housing 11. The stopper 30 can be rotated manually with a dedicated special tool. Thereby, the relative position of the roller 13 with respect to the rotary table 12 when it is closest to the rotary table 12 can be adjusted.

Next, the operation of the solid fuel crusher 1 will be described with reference to FIGS. 4 and 5. 4 and 5 are flowcharts showing processing of the control unit 50 of the solid fuel crusher 1. FIG. The control unit 50 executes each process shown in the flowcharts of FIGS. 4 and 5 by executing a program stored in a storage unit included in the control unit 50.
In step S401, the control unit 50 starts warming of the solid fuel crusher 1. Here, the warming refers to a process of warming the inside of the housing 11 of the fuel pulverization unit 10 by flowing a primary oxidizing gas into the fuel pulverization unit 10. The control unit 50 operates the pushing fan 80 and the primary oxidizing gas fan 90 to cause the primary oxidizing gas preheated by the oxidizing gas preheater 40 to flow into the fuel crushing unit 10.

  In the warming in step S401, the boiler 60 generates combustion gas by burning fuel using a liquid fuel burner (not shown) using light oil, heavy oil, or the like as fuel. And the oxidizing gas preheater 40 preheats by giving heat to oxidizing gas using the combustion gas discharged | emitted from the boiler 60 in warming.

In step S402, the control unit 50 detects the output of a temperature sensor provided in the vicinity of the outlet of the fuel crushing unit 10, and determines whether the detected temperature is equal to or higher than a predetermined temperature (for example, 70 ° C.). When it is determined that the temperature has become equal to or higher than the predetermined temperature, the control unit 50 advances the process to step S403.
In step S403, the control unit 50 instructs the fuel supply unit 36 to start the supply of solid fuel. The fuel supply unit 36 that has received an instruction from the control unit 50 starts supplying solid fuel to the solid fuel input unit 17 of the fuel crushing unit 10.

In step S404, the control unit 50 determines whether or not the roller 13 has started pulverization of the solid fuel input from the fuel supply unit 36 to the solid fuel input unit 17, and determines that the start of pulverization of the solid fuel has been detected. If so, the process proceeds to step S405. If the start of pulverization of the solid fuel is not detected, the process proceeds to step S410.
In step S404, the control unit 50 instructs the drive unit 14 to notify the output value of the detection unit (current detection sensor) 200a that detects the current value of the current flowing through the electric motor, and the notified current value. Based on the above, it is determined whether or not the pulverization of the solid fuel has been started. The roller 13 is pressed against the outer peripheral portion 12 b of the rotary table 12. When solid fuel enters between the roller 13 and the rotary table 12 and pulverization starts, the pressing force of the rotary table 12 and the roller 13 increases, and accordingly, the driving force required to rotate the rotary table 12 increases. And in order to supplement the drive force required to rotate the turntable 12, the drive part 14 raises the electric current value of the electric current supplied to an electric motor. The control unit 50 determines that the pulverization of the solid fuel has started when the current flowing through the electric motor exceeds a predetermined current value. Therefore, the information indicating whether or not the pulverization of the solid fuel determined based on the current value of the current flowing through the electric motor is the pulverization start detection information.

  In step S <b> 405, the control unit 50 controls the fuel supply unit 36 to decrease the amount of solid fuel supplied from the fuel supply unit 36. The fuel supply unit 36 that has received an instruction to reduce the fuel supply amount from the control unit 50 reduces the amount of solid fuel to be input to the solid fuel input unit 17. The reason why the fuel supply amount is decreased in step S405 is to reduce the fuel supply amount and operate the pulverized fuel boiler 60 with a small load until a predetermined time elapses after the pulverization of the solid fuel is started. .

In step S406, the control unit 50 determines whether or not a predetermined time has elapsed since the start of pulverization of the solid fuel. If it is determined that the predetermined time has elapsed, the fuel supply unit 36 increases the fuel supply amount. Is controlled (step S407).
In step S408, the control unit 50 determines whether or not to end the operation of the solid fuel crusher 1. If it is determined to end the operation, the control unit 50 stops the fuel supply by the fuel supply unit 36 (step S409). 4 is terminated.

  The above steps S405 to S409 are processes executed when solid fuel pulverization is started normally. The characteristic processing in the first embodiment is executed from Step S410 to Step S410 that are executed when solid fuel such as coal containing a lot of moisture accumulates on the central portion 12a of the turntable 12 and the start of pulverization of the solid fuel is not detected. This is the process of S413. Hereinafter, the processing from step S410 to step S413 will be described.

  If the start of pulverization of the solid fuel is not detected in step S404, in step S410, the control unit 50 determines whether a predetermined time (for example, 10 minutes) has elapsed since the start of fuel supply. When it is determined that the predetermined time has elapsed, the control unit 50 advances the process to step S411, and when it is not determined that the predetermined time has elapsed, the control unit 50 performs the determination in step S404 again.

  In step S411, since the pulverization of the solid fuel is not started even if a predetermined time has elapsed after the fuel supply is started, the fuel supply unit 36 is controlled to stop the fuel supply by the fuel supply unit 36. When it determines with YES in step S410, it is estimated that solid fuel, such as coal containing much water, has accumulated in the center part 12a of the turntable 12. FIG. Accordingly, the fuel supply by the fuel supply unit 36 is stopped so that a problem that a large amount of solid fuel moves from the central portion 12a to the outer peripheral portion 12b and a large amount of pulverized fuel is supplied to the burner portion 110 does not occur. Let

  In step S411, the control unit 50 stops the fuel supply by the fuel supply unit 36, but does not stop the blowing by the primary oxidizing gas fan 90 and the pushing fan 80. Therefore, the blowing of the primary oxidizing gas to the roller 13 by the primary oxidizing gas fan 90 is maintained. By doing in this way, the air flow by primary oxidizing gas is formed in the housing 11 of the fuel pulverization part 10, and water | moisture content will gradually evaporate from the high moisture solid fuel deposited in the center part 12a. .

In step S412, the control unit 50 detects whether or not the solid fuel accumulated in the central portion 12a has moved to the outer peripheral portion 12b due to the centrifugal force of the rotary table 12 and the pulverization of the solid fuel has been started. Note that a specific detection method is the same as that in step S404, and thus description thereof is omitted.
When it is determined that the solid fuel pulverization start is detected in step S412, the control unit 50 proceeds to step S413.

  In step S413, the control unit 50 determines whether a fuel supply resumption instruction has been received from the operator of the solid fuel crusher 1, and if it is determined that a fuel supply resumption instruction has been received from the operator, the process proceeds to step S403. To proceed. Whether or not a fuel supply restart instruction has been accepted is determined by the control unit 50 detecting whether or not the operator has pressed a fuel supply restart instruction button (not shown). In addition, after the start of solid fuel pulverization is detected in step S412, the fuel supply restart instruction by the operator is accepted without immediately starting the fuel supply. This is to restart the operation of the solid fuel crusher 1 after confirming the above.

If it is determined in step S413 that a fuel supply restart instruction has been issued (YES in step S413), the processes in and after step S403 are executed. Details of the processing after step S403 are as described above.
According to the processing of FIG. 4 described above, when the warming of the solid fuel pulverization apparatus 1 is completed and the start of pulverization of the solid fuel is not detected even after a predetermined time has elapsed after the fuel supply is started, the fuel supply is stopped. The primary oxidizing gas fan 90 continues to blow the primary oxidizing gas, and the fuel supply can be resumed until the solid fuel in the housing 11 starts to be crushed.

Next, the operation results of the solid fuel crusher of the first embodiment and the operation results of the solid fuel crusher of the comparative example of the first embodiment will be described using FIG. 8 and FIG.
FIG. 8 is a diagram showing the operation result of the solid fuel pulverization apparatus of the first embodiment, (a) shows the air volume of the primary oxidizing gas fan, (b) shows the outlet temperature of the solid fuel pulverization section, (C) shows the amount of fuel supplied from the fuel supply unit, and (d) shows the vapor temperature.
Moreover, FIG. 9 is a figure which shows the operation result of the solid fuel grinding | pulverization apparatus of the comparative example of 1st Embodiment, (a) shows the air volume of a primary oxidizing gas fan, (b) is a solid fuel grinding | pulverization part. The outlet temperature is shown, (c) shows the amount of fuel supplied from the fuel supply unit, and (d) shows the steam temperature.
8 and 9 both indicate time, and T0 to T6 indicate time. Further, the outlet temperature indicates a temperature detected by a temperature sensor (not shown) provided in the vicinity of the outlet 34 and the outlet 35 of the fuel pulverization unit 10. The steam temperature indicates the temperature of steam flowing through a steam pipe (not shown) in the pulverized fuel boiler 60.

  As shown in FIG. 8, at the time T0, the air volume increases and the outlet temperature starts to rise. Time T0 corresponds to step S401 (warming start) in the flowchart of FIG. At time T1, the air volume further increases and fuel supply by the fuel supply unit 36 is started. Time T1 corresponds to the timing at which the outlet temperature is determined to be equal to or higher than the predetermined temperature (YES in step S402) and fuel supply start (step S403) is executed.

  As shown in FIG. 8, fuel supply by the fuel supply unit 36 is stopped at time T2. At time T2, the start of pulverization of solid fuel is not detected even when a predetermined time (for example, 10 minutes) has elapsed from the start of fuel supply in step S410 in FIG. 5, and the fuel supply stop (step S411) is executed. It corresponds. At time T2, the fuel supply by the fuel supply unit 36 is stopped, but the blowing by the primary oxidizing gas fan 90 is maintained. However, the amount of air blown by the primary oxidizing gas fan 90 decreases at the timing when time T2 is reached.

  At time T3, the control unit 50 detects that the current value of the current flowing through the electric motor exceeds a predetermined value, and determines that solid fuel pulverization has started (YES in step S412). At time T4, the control unit 50 determines that a fuel supply restart instruction from the operator of the solid fuel crusher 1 has been received (YES in step S413), and the fuel supply of the solid fuel by the fuel supply unit 36 is restarted (YES in step S413). Step S403).

  The control unit 50 detects the start of pulverization of the solid fuel at time T5 (YES in step S404), decreases the fuel supply amount (step S405), and increases the fuel supply amount when a predetermined time has elapsed from the start of pulverization. (Step S407). In addition, the control part 50 also increases the air volume which the primary oxidizing gas fan 90 ventilates with the increase in the fuel supply amount.

Next, the operation result of the solid fuel crusher of the comparative example of 1st Embodiment is demonstrated using FIG.
As shown in FIG. 9, at the time T0, the air volume increases and the outlet temperature starts to rise. At time T1, the air volume further increases and fuel supply by the fuel supply unit 36 is started. The operation results so far are the same as the operation results of the solid fuel crusher of the first embodiment shown in FIG.

  In the comparative example shown in FIG. 9, fuel supply by the fuel supply unit 36 is started at time T1, but the fuel supply is continuously performed without pulverization of the solid fuel until time T6. The elapsed time from time T1 to time T6 in FIG. 9 is sufficiently longer than the elapsed time from time T1 to time T2 in FIG. That is, in the comparative example of FIG. 9, the solid fuel that has been supplied from time T1 continues to accumulate on the central portion 12a of the turntable 12, and the solid fuel moves from the central portion 12a to the outer peripheral portion 12b until time T6. do not do. Therefore, the amount of solid fuel deposited on the central portion 12a at time T6 in FIG. 9 is much larger than the amount of solid fuel deposited on the central portion 12a at time T5 in FIG.

  In the comparative example shown in FIG. 9, the pulverization of the solid fuel is started from the time T6 and the primary oxidizing gas containing the finely divided fuel is supplied to the burner unit 110. At time T6, a large amount of solid fuel moves from the central portion 12a to the outer peripheral portion 12b of the turntable 12, that is, the portion where the roller 13 and the turntable 12 pulverize the solid fuel. Accordingly, the amount of solid fuel pulverized at the time T6 of the comparative example in FIG. 9 is markedly larger than that at the time T5 in the first embodiment of FIG. Accordingly, as shown in FIG. 9D, in the comparative example, the steam temperature temporarily rises after time T6. On the other hand, as shown in FIG. 8D, in the first embodiment, the steam temperature is kept constant.

  As described above, according to the operation result of the solid fuel crusher of the first embodiment shown in FIG. 8, even if a predetermined time (for example, 10 minutes) elapses after the fuel supply by the fuel supply unit 36 starts. When the pulverization of fuel is not started, the fuel supply is temporarily stopped. Therefore, in the operation result of the solid fuel crusher of the first embodiment, compared with the comparative example in which the fuel supply is not stopped even after a predetermined time (for example, 10 minutes) has passed since the fuel supply unit 36 started the fuel supply. It has been shown that it is possible to suppress the problem that the steam temperature rapidly rises after the pulverization of the solid fuel is started.

  As described above, according to the solid fuel pulverization apparatus 1 of the first embodiment, the start of pulverization of the solid fuel is not detected even after a predetermined time has elapsed since the supply of the solid fuel by the fuel supply unit 36 is started. In addition, the supply of the solid fuel by the fuel supply unit 36 is stopped without stopping the blowing of the primary oxidizing gas to the roller 13 by the primary oxidizing gas fan 90. Further, the supply of the solid fuel by the fuel supply unit 36 is resumed in response to the detection of the start of pulverization of the solid fuel thereafter.

  In this way, it is possible to prevent the solid fuel containing a large amount of moisture from accumulating in a large amount on the central portion 12a of the turntable 12, and to restart the supply of the solid fuel by the fuel supply unit 36 at an appropriate timing. be able to. Therefore, when pulverizing a solid fuel containing a large amount of moisture, a large amount of solid fuel deposited on the central portion 12a of the turntable 12 is pulverized all together to prevent a large amount of pulverized fuel from being supplied to the burner unit 110. can do.

  Further, in the solid fuel pulverization apparatus 1 according to the first embodiment, the solid fuel pulverization is detected after the supply of the solid fuel by the fuel supply unit 36 is stopped, and further an instruction to resume the supply of the solid fuel is received from the operator. Then, the supply of the solid fuel by the fuel supply unit 36 is resumed. By doing so, the supply of the solid fuel by the fuel supply unit 36 is not resumed until the operator visually confirms the state of pulverization of the solid fuel and the operator gives an instruction to resume the supply. Can do.

  Further, in the solid fuel crusher 1 of the first embodiment, the drive unit 14 includes an electric motor, and the roller 13 is moved by the fuel supply unit 36 when the current value of the current supplied to the electric motor exceeds a predetermined value. It is detected that the pulverization of the supplied solid fuel has started. In this way, it is possible to detect the start of pulverization of the solid fuel based on the current value of the current supplied to the electric motor that rotates the turntable 12.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The second embodiment is a modification of the first embodiment, and the processing in the case where the fuel supply by the fuel supply unit 36 is resumed after the fuel supply by the fuel supply unit 36 is stopped is different from the first embodiment. .
In the first embodiment, the fuel supply by the fuel supply unit 36 is stopped (step S411), the start of solid fuel crushing is detected (YES in step S412), and then the fuel supply resumed by the operator of the solid fuel crusher 1 When the instruction is accepted (YES in step S413), the fuel supply by the fuel supply unit 36 is resumed.
On the other hand, in the second embodiment, the fuel supply by the fuel supply unit 36 is stopped (step S611), the start of pulverization of the solid fuel is detected (YES in step S612), and the standby time has elapsed thereafter (step S612). The fuel supply by the fuel supply unit 36 is restarted.

6 and 7 are flowcharts showing processing of the control unit 50 of the solid fuel crusher 1. The control unit 50 executes each process shown in the flowcharts of FIGS. 6 and 7 by executing a program stored in a storage unit included in the control unit 50.
The processes from step S601 to step S612 in the flowcharts of FIGS. 6 and 7 are the same as the processes from step S401 to step S412 in the flowcharts of FIGS.

  In step S613 of FIG. 7, the control unit 50 determines whether or not a standby time (for example, 2 minutes) has elapsed since the start of solid fuel pulverization was detected in step S612. When it is determined that the standby time has elapsed, the control unit 50 advances the process to step S603. In addition, after the start of solid fuel pulverization is detected in step S612, waiting for the elapse of the standby time without immediately starting the fuel supply waits until the operation of the boiler or the like is stabilized. Up to this point, the supply of solid fuel by the fuel supply unit 36 is not restarted.

  As described above, in the solid fuel pulverization apparatus 1 according to the second embodiment, the control unit 50 detects the start of pulverization of the solid fuel after the supply of the solid fuel by the fuel supply unit 36 is stopped, and waits. When the time has elapsed, control is performed so that the supply of solid fuel by the fuel supply unit 36 is resumed. By doing in this way, even if it is a case where the start of pulverization of the solid fuel is detected after the supply of the solid fuel is stopped, until the standby time until the operation of the pulverized fuel boiler 60 and the like becomes stable elapses. The solid fuel supply by the fuel supply unit 36 can be prevented from being resumed.

[Other Embodiments]
In the first embodiment, whether or not the pulverization of the solid fuel has been started is determined based on the output value of the detection unit (current detection sensor) 200a that detects the current value of the current flowing through the electric motor. Other embodiments may be used.
For example, it is detected whether or not the roller 13 is separated from the outer peripheral portion 12b of the rotary table 12 by a predetermined distance or more, and when it is detected that the roller 13 is separated by a predetermined distance or more, it is detected that the pulverization of the solid fuel is started. Anyway.

  In this case, whether or not the roller 13 is separated by a predetermined distance or more from the outer peripheral portion 12b of the rotary table 12 is determined by providing a movement amount detection sensor for detecting the movement amount of the intermediate piston 28 in the vicinity of the intermediate piston 28, for example. The determination may be made based on the output value of the quantity detection sensor.

  As described above, in the solid fuel pulverization apparatus according to another embodiment of the present invention, the solid fuel supplied by the fuel supply unit 36 when the roller 13 is separated from the rotary table 12 by a predetermined distance or more. It is detected that the crushing of the material has started. In this way, it is possible to detect the start of pulverization of the solid fuel based on the position of the roller 13 with respect to the rotary table 12.

DESCRIPTION OF SYMBOLS 1 Solid fuel crusher 10 Fuel crushing part 12 Rotary table 13 Roller 14 Drive part 16 Classification part 36 Fuel supply part 80 Pushing fan 90 Primary oxidizing gas fan 110 Burner part 200 Power supply apparatus 200a Detection part (current detection sensor)

Claims (7)

A rotary table that is rotated by a driving force from a driving unit;
A fuel supply unit for supplying a solid fuel to the center of the rotary table;
A roller that is pressed by the outer peripheral portion of the rotary table and crushes the solid fuel that moves from the central portion to the outer peripheral portion with the rotation of the rotary table;
A classification unit that is provided above the rotary table and classifies the solid fuel crushed by the roller into a finely divided fuel smaller than a predetermined particle size;
A primary air blowing unit for blowing a primary oxidizing gas for supplying the solid fuel crushed by the roller to the classification unit;
A detection unit for detecting whether the roller has started pulverization of the solid fuel supplied by the fuel supply unit;
A controller for controlling the supply of the solid fuel by the fuel supply unit and the blowing of the primary oxidizing gas to the roller by the primary blowing unit;
The control unit is configured to detect the primary oxidizability of the primary blower to the roller based on an elapsed time from the start of supply of the solid fuel by the fuel supply unit and detection information on the start of pulverization of the solid fuel by the detection unit. A solid fuel pulverization apparatus that controls a blowing state of gas and a supply state of the solid fuel by the fuel supply unit.   The controller controls the roller by the primary air blower when the detection unit does not detect the start of pulverization of the solid fuel even after a predetermined time has elapsed after the supply of the solid fuel by the fuel supply unit is started. The fuel supply unit stops the supply of the solid fuel by the fuel supply unit without stopping the blowing of the primary oxidizing gas to the fuel supply unit, and the detection unit detects the start of pulverization of the solid fuel. 2. The solid fuel pulverization apparatus according to claim 1, wherein the solid fuel pulverization apparatus is controlled to restart the supply of the solid fuel. Receiving means for receiving an instruction to resume the supply of the solid fuel by an operator;
When the control unit detects the start of pulverization of the solid fuel after stopping the supply of the solid fuel by the fuel supply unit, and the receiving unit receives the supply restart instruction The solid fuel pulverization apparatus according to claim 1, wherein the solid fuel pulverization apparatus is controlled to resume the supply of the solid fuel by the fuel supply unit.   The control unit detects the start of pulverization of the solid fuel after stopping the supply of the solid fuel by the fuel supply unit, and the fuel supply is performed when a predetermined standby time has elapsed. 3. The solid fuel pulverization apparatus according to claim 1, wherein control is performed so that the supply of the solid fuel by the unit is resumed. 4. The drive unit includes an electric motor,
The detection unit detects that the roller starts pulverization of the solid fuel supplied by the fuel supply unit when the current value of the current supplied to the electric motor exceeds a predetermined value. The solid fuel pulverization apparatus according to any one of claims 1 to 4.   The said detection part detects that the said roller started the grinding | pulverization of the solid fuel supplied by the said fuel supply part, when the said roller left | separated more than predetermined distance with respect to the said rotary table. The solid fuel crusher according to any one of claims 1 to 4. A rotary table that is rotated by a driving force from a drive unit; a fuel supply unit that supplies solid fuel to a central portion of the rotary table; and a central portion that is pressed by an outer peripheral portion of the rotary table and rotates with the rotary table. A roller for pulverizing the solid fuel moving from the portion to the outer peripheral portion, a classification unit provided above the rotary table, for classifying the solid fuel pulverized by the roller into finely pulverized fuel having a predetermined particle diameter, and the roller A method for controlling a solid fuel pulverizing apparatus, comprising: a primary air blowing unit that blows a primary oxidizing gas for supplying the solid fuel pulverized by the classifying unit,
A supply start step of starting supply of the solid fuel by the fuel supply unit;
A first detection step of detecting whether or not the roller has started pulverization of the solid fuel supplied by the fuel supply unit until a predetermined time has elapsed since the supply of the solid fuel in the supply start step was started. When,
In the case where the first detection step does not detect the start of pulverization of the solid fuel, the solid supply of the solid fuel by the fuel supply unit without stopping the blowing of the primary oxidizing gas to the roller by the primary blowing unit. A supply stop process for stopping supply;
A second detection step of detecting whether or not the roller starts pulverization of the solid fuel supplied by the fuel supply unit after the supply of the solid fuel is stopped by the supply stop step;
A supply restarting step for controlling to restart the supply of the solid fuel by the fuel supply unit in response to the second detection step detecting the start of pulverization of the solid fuel;
A control method for a solid fuel pulverizing apparatus, comprising:

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