JP6432536B2 - Waste incinerator apparatus and waste incineration method - Google Patents

Description

  The present invention relates to a waste incinerator apparatus and a waste incineration method, and more particularly to a grate-type waste incinerator apparatus and a waste incineration method using the grate-type waste incinerator apparatus.

  As this kind of waste incinerator apparatus, a grate (stalker) incinerator shown in Non-Patent Document 1 is known.

  The grate-type incinerator in Non-Patent Document 1 includes a furnace main body that forms a combustion chamber in the furnace, an input cylinder for dropping waste into the furnace main body, and a floor that is located at the lower end of the input cylinder And a pusher for pushing waste into the furnace. The pusher repeats reciprocating movement at a constant cycle between the extrusion start point (retraction position) and the extrusion end point (advance position), and waste is moved when moving forward (advance) from the extrusion start point to the extrusion end point. Is pushed into the furnace. In this specification, in the direction of transporting waste in the incinerator or the combustion chamber, the transfer start point side is referred to as “upstream part”, “upstream side” or “rearward”, and the transfer end point side is referred to as “downstream side” or “ Say “forward”.

  A grate is provided in the lower part of the combustion chamber, and combustion air is supplied from below. Waste on the receiving floor pushed forward by the pusher falls onto a grate upstream of the combustion chamber. The grate has a movable grate that sends waste in the combustion chamber forward (downstream) and a fixed grate, and the movable grate and the fixed grate alternate in the front-rear direction. It is arranged and configured. The movable grate repeats reciprocation at a constant cycle between the conveyance start point (retreat position) and the conveyance end point (advance position). When moving from the conveyance start point to the conveyance end point, Transport waste forward. Waste on the grate is incinerated by being dried, burned and post-burned while being sent forward by the movement of the movable grate.

  The pusher supplies a substantially constant volume of waste material onto the grate by one forward movement (advance). Further, the movable grate conveys a substantially constant volume of waste forward by a single forward movement (advance), so the volume of waste on the grate in the combustion chamber is uniform in the front-rear direction. Therefore, if the bulk density of the waste that is dropped onto the upstream grate in the combustion chamber (the value obtained by dividing the waste weight by the waste volume) is constant, the waste is fixed by the movable grate. Since the weight of the waste on the grate becomes uniform in the front-rear direction by being conveyed forward by the volume, the waste is burned stably.

  However, when the type and properties of the waste supplied to the incinerator change and the bulk density of the waste supplied on the upstream grate fluctuates, it moves forward by a fixed volume by the movable grate. Even if transported, the weight of the waste on the grate varies in the front-rear direction, and the combustion state of the waste becomes unstable. In order to cope with such a situation, as will be described later with reference to FIG. 3, by adjusting the operation of the pusher according to the change in the bulk density of the waste supplied on the upstream grate, the above-mentioned It has been conventionally known that variation in the front-rear direction of the weight of waste on the grate is reduced.

  FIG. 3 is a graph showing temporal changes in the weight of waste and the bulk density of waste on the grate at the upstream portion in the combustion chamber when the operation of the pusher in the conventional waste incinerator is controlled. , (A) is the position of the pusher and the movable grate over time, (B) is the time-dependent variation of the waste weight on the grate, and (C) is the time-dependent variation of the bulk density of the waste on the grate. Is shown. Here, (B) is present on the grate when the waste pushed out by the pusher falls on the grate upstream of the combustion chamber and is conveyed forward by the movable grate. It shows the variation over time of the weight of the waste.

  As indicated by the broken line in FIG. 3 (A), the movable grate is A1 seconds from the transfer start point to the transfer end point as a normal operation (for example, time T0 to T1 in FIG. 3 (A)). And moves backward from the conveyance end point to the conveyance start point in A2 seconds (for example, time T1 to T2 in FIG. 3A). That is, the movable grate always reciprocates once with a period of A seconds (A1 seconds + A2 seconds).

  On the other hand, when the weight of the waste existing on the grate upstream of the combustion chamber is equal to or less than a predetermined value C (see times T0 to T10 in FIG. 3B), the pusher Behaves like As shown by the solid line in FIG. 3A, the normally operating pusher moves forward from the extrusion start point to the extrusion end point in B1 seconds (for example, time T0 to T5 in FIG. 3A). Then, the actuator moves backward from the extrusion end point to the extrusion start point in B2 seconds (for example, time T5 to T7 in FIG. 3A). That is, the pusher reciprocates once with a period of B seconds (B1 seconds + B2 seconds). When the pusher period B seconds is set to, for example, three times the movable grate period A seconds (B = 3 × A), the pusher reciprocates once in a time period in which the movable grate repeats reciprocation three times. To do. Further, the pusher's forward movement starts simultaneously with the start of the movement of the movable grate (for example, at time T0 in FIG. 3A), and after the pusher's forward movement starts, the movable grate moves for the third time. At the same time when the backward movement is finished, the backward movement of the pusher is finished (for example, time T7 in FIG. 3A).

In this way, the weight of the waste present on the upstream grate in the combustion chamber is not more than the predetermined value C (kg), and during the normal operation of the pusher, The bulk density of the waste is maintained at a predetermined value D (t / m ³ ) and does not vary. Therefore, the weight of the waste on the grate extending in the front-rear direction of the combustion chamber is uniform, and the combustion state of the waste is stable.

  Here, a waste having a bulk density twice as high as that of the waste supplied by the first forward movement of the pusher is supplied at the second forward movement of the pusher, and the waste is reciprocated by the movable grate. It is detected that the waste weight on the grate upstream of the combustion chamber has exceeded a predetermined value C (kg) at time T11 in the second forward movement process of the pusher. (See FIG. 3B). This means that the bulk density of the waste on the upstream grate has greatly increased (see time T11 in FIG. 3C). At this time, the pusher was moving forward at time T11, but immediately started moving backward and pushed out at time T13 earlier than time T15 when the sixth reciprocation of the movable grate ended. Controlled to return to the starting point. In FIG. 3, the time next to time T11 is shown as time T13 for convenience of comparison with the description in FIG. 2 described later.

Moreover, since the movable grate reciprocates as usual regardless of the operation of the pusher, waste is supplied by the pusher at times T11 to T13, that is, while the pusher is moving back. In the meantime, part of the waste on the upstream grate is conveyed forward by the movable grate, so that the weight of the waste starts to decrease from time T11, and then the predetermined value C is (See times T11 to T13 in FIG. 3B). Further, a part of the waste on the upstream grate is conveyed forward by the movable grate, so that the bulk density of the waste on the grate is reduced, and a predetermined value D (t / m ³ ) (See time T11 to T13 in FIG. 3C).

  In this way, when the weight of the waste on the grate in the upstream part exceeds a predetermined value, the pusher is moved back to reduce the bulk density of the waste, thereby reducing the waste density on the grate. The fluctuation of the bulk density is suppressed, and as a result, the bulk density of the waste on the grate in the longitudinal direction of the combustion chamber is maintained as uniform as possible.

JFE Engineering Catalog CA3006 Waste Incinerator Hyper Grate Incinerator March 2003 <http://www.jfe-eng.co.jp/products/environment/pdf/CA3006.pdf>

  In the pusher operation control method described above, as shown in FIG. 3A, the pusher that has returned to the extrusion start point at time T13 immediately starts the third forward movement and resumes normal operation. At this time T13, the sixth reciprocation of the movable grate has not ended, and the movable grate returns to the conveyance start point at time T15 after time T13, and immediately the seventh forward movement. To start. That is, there is a difference of E seconds (time T13 to T15) between the forward movement start time of the pusher and the forward movement start time of the movable grate. Then, after time T13, as long as the pusher continues normal operation, the pusher and the movable grate will reciprocate with the E-second gap remaining.

If the deviation remains, for example, as seen at times T14 to T15 in FIG. 3A, the pusher moves forward (third forward movement), while the movable grate moves backward (sixth time). Period will occur regularly. Thus, during such a period, the pusher supplies waste on the upstream grate while the movable grate does not carry the upstream waste forward. As a result, the weight of the waste on the grate increases due to the supply by the pusher (see time T14 to T15 in FIG. 3B), and the movable grate does not carry the waste, so that the upstream grate The bulk density of the upper waste increases and becomes larger than a predetermined value D (t / m ³ ) (see time T14 to T15 in FIG. 3C). That is, even if the pusher is moved backward at time T11 to reduce the bulk density of the waste present on the upstream grate, the bulk density will increase again.

As described above, when the pusher and the movable grate are reciprocated while being displaced at the start of the forward movement, the pusher and the movable grate are present on the upstream grate as seen at times T11 to T17 in FIG. The bulk density of the waste to be produced is not maintained at the predetermined value D (t / m ³ ), and fluctuations in the bulk density cannot be suppressed. As a result, even if the movable grate repeatedly transports a certain volume of waste, the bulk density of the waste on the grate and thus the weight of the waste fluctuates over time, and the grate in the front-rear direction of the combustion chamber Since the weight of the upper waste is not uniform, it becomes difficult to maintain a stable combustion state of the waste.

  In view of such circumstances, the present invention provides a waste incinerator apparatus and a waste incineration method capable of quickly suppressing fluctuations in the bulk density of waste on a grate and maintaining a stable combustion state of the waste. The task is to do.

  According to the present invention, the above-described problems are solved by the following first invention with respect to the waste incinerator apparatus and the second invention with respect to the waste incineration method.

<First invention>
A waste incinerator apparatus according to a first invention is a waste incinerator apparatus for incinerating waste in a combustion chamber, and is provided at a lower portion of the combustion chamber, and is reciprocated at a constant cycle between a transfer start point and a transfer end point. A grate having a movable grate that conveys the waste toward the downstream side during forward movement, and a position on the upstream side of the combustion chamber, and the period of the reciprocating movement of the movable grate The reciprocating motion between the extrusion start point and the extrusion end point is repeated at a cycle of an integer multiple, and the waste is pushed out toward the combustion chamber at the time of forward movement and supplied to the upstream grate in the combustion chamber. A waste layer thickness index value derived by measuring or calculating a waste layer thickness index value indicating the thickness of the waste layer existing on the grate at the upstream portion in the combustion chamber And the reciprocating motion of the pusher based on the derived waste layer thickness index value. And a control unit for controlling the reciprocating movement of the movable grate.

  In such a grate-type waste incinerator apparatus, in the first invention, the control device, when the waste layer thickness index value is a predetermined value or less, every predetermined number of reciprocations of the movable grate. The pusher and the movable grate are controlled so that the reciprocating motion in which the pusher and the movable grate simultaneously start the reciprocating movement without interruption is performed, and the waste layer thickness index value is controlled. Exceeds the predetermined value, the pusher returns to the extrusion start point even before reaching the extrusion end point, and returns to the transfer start point even before the movable grate reaches the transfer end point. The pusher and the movable grate are configured to control the pusher and the movable grate so that the next forward movement is started simultaneously and the normal operation is resumed.

  In the first invention, as described above, the waste layer derived by measuring or calculating the waste layer thickness index value indicating the thickness of the waste layer existing on the grate upstream in the combustion chamber When the thickness index value exceeds the predetermined value, the pusher returns to the extrusion start point even before reaching the extrusion end point, and the transfer start point even before the movable grate reaches the transfer end point. Then, the pusher and the movable grate simultaneously start the next forward movement and resume their normal operations. When the pusher and the movable grate resume normal operation in this way, one reciprocating motion of the pusher and the predetermined number of reciprocating motions of the movable grate are started at the same time and finished simultaneously. Thus, there is no difference between the start time and the end time of the reciprocating motion as in the prior art. As a result, even after resuming normal operation of the pusher, fluctuations in the weight of the waste on the upstream grate and hence the bulk density can be suppressed more quickly than before, so that The weight of the waste on the direction grate can be made closer to the uniform, and the stable combustion state of the waste can be more reliably maintained.

<Second invention>
A waste incineration method according to the second invention is a waste incineration method for incinerating waste in a combustion chamber, wherein a movable grate of a grate provided at a lower portion of the combustion chamber is disposed between a conveyance start point and a conveyance end point. By repeating the reciprocating motion at a constant period, the waste is transported toward the downstream side during the forward movement, and the pusher provided at the upstream side of the combustion chamber is moved by the reciprocating motion of the movable grate. By reciprocating between the extrusion start point and the extrusion end point at a cycle that is an integral multiple of the cycle, waste is pushed out toward the combustion chamber during the forward movement, and the waste is pushed onto the upstream grate in the combustion chamber. The waste layer derived from the waste layer by supplying or measuring the waste layer thickness index value indicating the thickness of the waste layer present on the grate upstream of the combustion chamber. Based on the thickness index value, the reciprocating motion of the pusher and the movable grate To control the backward movement.

  In this waste incineration method, in the second invention, when the waste layer thickness index value is equal to or less than a predetermined value, the pusher and the movable grate are transferred every predetermined number of reciprocations of the movable grate. The pusher and the movable grate are controlled so as to perform a normal operation that repeats reciprocating motions that simultaneously start movement without interruption, and when the waste layer thickness index value exceeds the predetermined value, Even before the pusher reaches the extrusion end point, the pusher returns to the extrusion start point, and even before the movable grate reaches the transfer end point, the pusher and the movable grate return to the next point. The pusher and the movable grate are controlled so as to simultaneously start the forward movement and restart the normal operation.

  As described above, according to the present invention, when the waste layer thickness index value indicating the thickness of the waste layer existing on the grate upstream in the combustion chamber exceeds a predetermined value, the pusher is Even before reaching the end point of extrusion, it returns to the extrusion start point, and even before the movable grate reaches the transfer end point, it returns to the transfer start point, and the pusher and the movable grate move forward next time. Since the normal operation is resumed at the same time, the start time and the end time of the reciprocation of the pusher and the reciprocation of the movable grate a predetermined number of times are not caused after the resumption of the normal operation. . Therefore, after resuming the normal operation of the pusher and the movable grate, the fluctuation of the weight and the bulk density of the waste on the upstream grate can be suppressed more quickly than in the prior art. The weight of the waste on the grate in the front-rear direction can be made nearly uniform, and the stable combustion state of the waste can be more reliably maintained.

It is a longitudinal cross-sectional view which shows schematic structure of the one Embodiment apparatus of this invention. FIG. 3 is a graph showing temporal changes in the weight of waste and the bulk density of waste existing on the grate upstream in the combustion chamber when the operation of the pusher and the movable grate in the apparatus of FIG. 1 is controlled. Yes, (A) is the fluctuation of the position of the pusher and the movable grate, (B) is the fluctuation of the waste weight on the grate with time, (C) is the fluctuation of the bulk density of the waste on the grate with time. Is shown. It is the graph which showed the time-dependent fluctuation | variation of the waste weight and waste bulk density which exist on the grate in the upstream part in a combustion chamber when controlling the operation | movement of the pusher in the conventional waste incinerator apparatus, A) shows the change in the position of the pusher and the movable grate, (B) shows the change in the weight of the waste on the grate over time, and (C) shows the change in the bulk density of the waste on the grate over time. Yes.

  Hereinafter, the configuration of an apparatus according to an embodiment of the present invention will be described with reference to FIG. 1 of the accompanying drawings.

  FIG. 1 shows a waste incinerator apparatus 10 according to this embodiment. The waste incinerator apparatus 10 is connected to a main combustion chamber 12 and a combustion gas discharge unit of the main combustion chamber 12 in the furnace. A furnace main body 11 that forms a chamber 13, an input cylinder 14 for dropping waste W into the furnace main body 11, and a combustion chamber that is provided downstream of the secondary combustion chamber 13 and burns waste in the furnace. It has an exhaust part (not shown) for exhausting generated exhaust gas, and an ash content discharge part 16 for discharging unburned and non-combustible materials remaining after combustion of waste as ash, and is further positioned at the lower end of the input cylinder 14 A rod-shaped pusher 18 that reciprocates in the front-rear direction (left-right direction in FIG. 1) immediately above the receiving floor 17 (see the arrow in FIG. 1) is provided.

  The pusher 18 repeats the reciprocating motion between the extrusion start point and the extrusion end point, pushes out the waste W during the forward movement (advance toward the main combustion chamber 12), and the upstream portion (in FIG. 1). The waste W is supplied by dropping at a substantially constant volume onto the grate on the left end side portion).

  A grate 19 is provided below the main combustion chamber 12. The grate 19 has a movable grate 19A for sending waste W on the grate 19 forward (downstream), and a fixed grate 19B fixed at the bottom of the main combustion chamber 12, The movable grate 19A and the fixed grate 19B are alternately arranged in the front-rear direction. The movable grate 19A repeats reciprocation at a constant cycle between the conveyance start point (retreat position) and the conveyance end point (advance position) (see the arrow in FIG. 1), and is conveyed from the conveyance start point. When moving forward to the end point, the waste W on the grate 19 is sent forward.

  In the present embodiment, a measured value of the weight of the waste existing on the grate 19 is used as an index value of the thickness of the waste layer on the grate (waste layer thickness index value). In addition, the waste incinerator 10 measures the weight of the waste W existing on the grate 19 below the grate 19 located in the upstream portion in the main combustion chamber 12, for example, a load cell And a control device 21 for controlling the reciprocation of the pusher 18 and the movable grate 19A based on the measured value of the weight of the waste W present on the grate 19. I have. Control of the pusher 18 and the movable grate 19A by the control device 21 will be described later with reference to FIG. Further, the weight measuring unit is not limited to a unit that directly measures the weight of the waste W like the above-described load cell, and may be a unit that indirectly measures the weight of the waste W.

  The grate 19 is supplied with primary combustion air fed into the furnace by an air feed pipe 23 connected to wind boxes 22A, 22B, and 22C provided in order in the front-rear direction at the lower position. It has become. The primary combustion air is fed into the furnace by a pressure feed blower (not shown). The waste W on the grate 19 is incinerated by being dried, burned, and post-burned while being sent forward by the operation of the movable grate 19 </ b> A, and ash is discharged from the ash discharge unit 16.

  Further, the exhaust gas generated by the incineration of the waste W in the main combustion chamber 12 is exhausted (not shown) after the unburned gas contained in the exhaust gas is secondarily burned in the secondary combustion chamber 13. Discharged from.

  Next, control of the pusher 18 and the movable grate 19A by the control device 21 will be described based on FIG. FIG. 2 shows the weight and bulk of the waste W on the grate 19 in the upstream portion of the main combustion chamber 12 when the operations of the pusher 18 and the movable grate 19A in the waste incinerator apparatus 10 of FIG. 1 are controlled. It is the graph which showed the change of density over time. Specifically, FIG. 2A shows the change in position of the pusher 18 and the movable grate 19A over time by a solid line for the pusher 18 and a broken line for the movable grate 19A, and FIG. FIG. 2C shows the change over time in the bulk density of the waste W on the grate 19.

  As shown in FIG. 2A, in this embodiment, the pusher 18 and the movable grate 19A during normal operation are the same as the conventional pusher and movable grate described above as normal operation based on FIG. Reciprocates at the same timing. That is, when the measured value of the weight of the waste W present on the grate measured by the weight measuring means is equal to or less than the predetermined value C (kg) (normal time), the control device 21 conveys the movable grate 19A. The pusher 18 is controlled so that the pusher 18 reciprocates once between the extrusion start point and the extrusion end point during a period of reciprocation between the start point and the conveyance end point (A second × 3) (for example, time T0). ~ T7). The pusher 18 starts the forward movement simultaneously with the start of the forward movement of the movable grate 19A (for example, time T0), and ends the backward movement simultaneously with the end of the third backward movement of the movable grate 19A (for example, the time T7). .

Under the normal operation of the pusher 18 and the movable grate 19A at the times T0 to T7, as shown in FIG. 2B, the waste W present on the grate measured by the weight measuring means is measured. The measured value of the weight is suppressed to a predetermined value C (kg) or less, and as shown in FIG. 2C, the bulk density of the waste W present on the upstream grate is constant. D (t / m ³ ). As a result, the weight of the waste W on the grate 19 in the front-rear direction of the main combustion chamber 12 becomes uniform, and a stable combustion state of the waste W is maintained.

  In this embodiment, for example, as in the conventional case described above with reference to FIGS. 3A to 3C, the waste supplied onto the upstream grate 19 by the first forward movement of the pusher 18. When waste W having a bulk density twice as high as that of the object W is supplied during the second forward movement of the pusher 18, the waste W is conveyed on the grate 19 by the reciprocating movement of the movable grate 19A. 2B, at the time T11 of the second forward movement of the pusher, the measured value of the weight of the waste W present on the grate measured by the weight measuring means is a predetermined value C. (Kg) is detected. This means that the bulk density of the waste waste existing on the upstream grate has greatly increased (see time T11 in FIG. 2C).

  When the measured value exceeds the predetermined value C (kg) (time T11), as described below, the control device 21 pushes the pusher 18 so that the pusher 18 and the movable grate 19A interrupt and resume their normal operations. And the operation of the movable grate 19A.

  First, when the measured value exceeds a predetermined value C (kg) (time T11), the pusher 18 stops immediately and interrupts the forward movement, and even before the pusher 18 reaches the extrusion end point, the pusher 18 Return to the starting point (time T13). On the other hand, the movable grate 19A does not stop immediately, but moves forward toward the conveyance end point until time T12, stops and interrupts the forward movement, and before the movable grate 19A reaches the conveyance end point. However, the process returns to the conveyance start point (time T13). In the present embodiment, as described above, the movable grate 19A moves forward until time T12. As a result, when the pusher 18 returns to the extrusion start point, the movable grate 19A returns to the conveyance start point. At the same time (time T13).

Further, while the pusher 18 interrupts the normal operation and returns to the extrusion start point, and while the waste is not supplied by the pusher, a part of the waste on the upstream grate is moved forward by the movable grate 19A. , The weight of the waste on the grate begins to decrease from time T11 and then falls below the predetermined value C (see time T11 to T12 in FIG. 2B). Further, the bulk density of the waste W present on the upstream grate also decreases to a predetermined value D (t / m ³ ) (see time T11 to T12 in FIG. 2C).

  Next, the pusher 18 that has returned to the extrusion start point and the movable grate 19A that has returned to the transfer start point immediately resume normal operation (time T13). That is, the normal operations of the pusher 18 and the movable grate 19A are simultaneously resumed at time T13, and the period in which the movable grate 19A reciprocates three times (A second) as in the normal operation performed at times T0 to T7. In x3), the pusher 18 reciprocates once. Therefore, after time T13, the forward movement start time and backward movement end time of the pusher 18 and the forward movement start time and backward movement end time of the movable grate 19A are simultaneous. That is, after the pusher 18 and the movable grate 19A resume normal operation, there is no difference in the forward movement start time and the backward movement end time between the pusher 18 and the movable grate 19A. As a result, as seen at times T13 to T19 in FIG. 2C, after the normal operation is resumed, the waste W is compared with the conventional case shown at times T13 to T19 in FIG. The period during which the bulk density fluctuates is short, and the bulk density is stably maintained.

Further, in this embodiment, when the measured value of the weight of the waste W present on the grate exceeds a predetermined value C (kg), both the pusher 18 and the movable grate 19A are set as the extrusion start point and the conveyance start point. Since the operation is resumed at the same time (time T13), the normal operation of the pusher 18 and the movable grate 19A can be quickly and simultaneously resumed without waiting for one of the pusher 18 and the movable grate 19A. Therefore, when the weight of the waste on the grate exceeds the predetermined value C, the weight can be quickly reduced. As a result, as seen at times T13 to T19 in FIG. 2 (C), it is present on the upstream grate compared to the conventional case shown at times T13 to T19 in FIG. 3 (C). The bulk density of the waste W to be reduced can be reduced to a predetermined value D (t / m ³ ) or so in a short period of time.

  In addition, it is not essential that both the pusher 18 and the movable grate 19A return to the extrusion start point and the conveyance start point at the same time, and there may be a time difference. That is, when the measured value exceeds the predetermined value C (kg), it is only necessary that both the pusher 18 and the movable grate 19A return to the extrusion start point and the conveyance start point. In this case, one of the pusher 18 and the movable grate 19A that has been returned first waits until the other is returned. Even in such an operation, the normal operation of both can be resumed earlier compared to the case where only the pusher returns when the measured value exceeds the predetermined value C (kg) as in the conventional case. As a result, the fluctuation of the bulk density and the bulk density can be quickly suppressed.

  As described above, according to the present embodiment, even after the normal operation of the pusher 18 and the movable grate 19A is resumed, the weight of the waste W on the upstream grate 19A and the fluctuation of the bulk density are conventionally changed. Compared to the main combustion chamber 12, the weight and bulk density of the waste W on the grate 19 are maintained to be uniform, and the stable combustion state of the waste W is more reliably ensured. Can be maintained.

  In the above embodiment, the measured value of the weight of the waste present on the grate was used as an index value of the thickness of the waste layer on the grate, but instead of or in addition to this, Calculate the combustion parameter values from the measured values of the combustion state of the waste on the grate, such as the pressure of the primary air supplied from below the grate, the air flow rate, the pressure loss of the temporary air sent from the grate, the pressure in the furnace Then, the calculated combustion parameter value may be used as an index value of the thickness of the waste layer on the grate.

DESCRIPTION OF SYMBOLS 10 Waste incinerator 11 Main combustion chamber 18 Pusher 19 Grate 19A Movable grate 21 Control device W Waste

Claims (2)

A waste incinerator for incinerating waste in a combustion chamber,
A grate having a movable grate provided at a lower part of the combustion chamber, repeating a reciprocating movement at a constant cycle between a conveyance start point and a conveyance end point, and conveying waste toward the downstream side during forward movement;
It is provided at a position upstream of the combustion chamber and repeats reciprocation between the extrusion start point and the extrusion end point at a cycle that is an integral multiple of the reciprocation cycle of the movable grate. A pusher for pushing the waste toward the upstream grate in the combustion chamber and supplying the waste
Waste layer thickness index value deriving means for measuring or calculating a waste layer thickness index value indicating the thickness of the waste layer existing on the grate upstream in the combustion chamber;
In a grate-type waste incinerator apparatus comprising a controller for controlling reciprocation of the pusher and reciprocation of the movable grate based on the derived waste layer thickness index value,
When the waste layer thickness index value is equal to or less than a predetermined value, the control device is configured such that the pusher and the movable grate simultaneously start a forward movement every predetermined number of reciprocations of the movable grate. The pusher and the movable grate are controlled so that a normal operation that repeats reciprocation without interruption is performed, and the pusher reaches the extrusion end point when the waste layer thickness index value exceeds the predetermined value. Even before the return to the extrusion start point, the return to the transfer start point even before the movable grate reaches the transfer end point, and the pusher and the movable grate start the next forward movement at the same time. The waste incinerator apparatus, wherein the pusher and the movable grate are controlled so as to resume the normal operation. A waste incineration method for incinerating waste in a combustion chamber,
By transporting the movable grate of the grate provided in the lower part of the combustion chamber between a transfer start point and a transfer end point with a fixed period of reciprocating motion, the waste is transferred toward the downstream side during forward movement,
The pusher provided at a position upstream of the combustion chamber is moved forward and backward by repeating reciprocation between the extrusion start point and the extrusion end point at a cycle that is an integral multiple of the reciprocation cycle of the movable grate. Sometimes pushing the waste toward the combustion chamber to supply the waste on the grate upstream of the combustion chamber;
Measuring or calculating a waste layer thickness index value indicating the thickness of the waste layer present on the grate in the upstream portion of the combustion chamber,
In the waste incineration method for controlling the reciprocating motion of the pusher and the reciprocating motion of the movable grate based on the derived waste layer thickness index value,
When the waste layer thickness index value is less than or equal to a predetermined value, the reciprocating motion in which the pusher and the movable grate simultaneously start the forward and backward movement every predetermined number of reciprocating motions of the movable grate without interruption. The pusher and the movable grate are controlled so that repeated normal operations are performed, and when the waste layer thickness index value exceeds the predetermined value, the pusher is before reaching the extrusion end point. Return to the extrusion start point and return to the transfer start point even before the movable grate reaches the transfer end point, and the pusher and the movable grate simultaneously start the next forward movement to perform the normal operation. A waste incineration method, wherein the pusher and the movable grate are controlled to resume.

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