JP6918293B1 - Combustion completion device and combustion completion method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion completion device capable of maintaining an appropriate accumulated thickness of an incineration residue while preventing burning of a tip grate. SOLUTION: In the combustion completion device of the present invention, the incinerator discharged from the incinerator can be deposited, the combustion completion air supplied from below can flow through, and the incinerator is discharged to the lower layer side at a predetermined frequency. The incinerator residue discharge mechanism discharged from the incinerator, the incinerator residue discharge chamber located below the incinerator residue discharge mechanism, the incinerator air supply means for supplying the incinerator residue discharge mechanism with the incinerator residue discharge mechanism, and the incinerator. It is a combustion completion device provided with a control means for controlling the discharge frequency of the residue discharge mechanism, and is provided with a deposit thickness detecting means for detecting the deposit thickness of the incinerator residue deposited on the incinerator discharge mechanism, and the control means is the deposit thickness detection. The discharge frequency and / or transfer rate of the stoker is controlled by the incinerator residue discharge mechanism so that the deposit thickness detected by the means falls within a predetermined range. [Selection diagram] Fig. 2

Description

The present invention relates to a technique for completely burning unburned components while preventing grate burnout in a waste incinerator in a combustion completion device that burns and discharges unburned components contained in the incineration residue.

Conventionally, a so-called stoker-type incinerator has been used to treat general waste and industrial waste. The stoker-type incinerator is an incinerator of the type in which garbage is gradually dried and burned while moving forward as a result of the reciprocating movement of a grate called a stoker, which is arranged in the front-rear and left-right directions. Although it has a simple structure, it can treat a large amount of waste regardless of the amount of water and evaporation of the input waste, so it is used in many incinerators.

In a stoker-type incinerator, the entire grate is usually composed of a three-stage stoker, a dry stoker, a combustion stoker, and a post-combustion stoker, or a two-stage stoker, a dry stoker and a combustion / post-combustion stoker. A combustion completion device may be installed after the stoker to ensure that the waste is burned without remaining unburned. FIG. 6 shows a schematic view of a conventional stoker-type incinerator 9 composed of a drying stoker 91, a combustion stoker 92, a post-combustion stoker 93, and a combustion completion device 94. In the prior art shown in FIG. 6, the incineration residue discharged from the post-combustion stoker 93 is deposited on the combustion completion device 94, and the combustion completion device air is supplied from below the combustion completion device to bring the incineration residue to a sufficient temperature. It is allowed to stay in the region for a sufficient time to completely burn the unburned components in the residue.

The incineration residue deposited on the combustion completion device 94 is intermittently discharged to the cooling water tank 95 from the lower layer side, but depending on the amount of the incineration residue supplied from the post-combustion stoker 93 and the frequency of discharge from the combustion completion device. The thickness of the incineration residue deposited on the combustion completion device 93 varies. If the amount of deposition is small, air for completing combustion may be blown through, which may adversely affect the combustion of unburned components. Further, when the amount of deposition is small, the position of the upper surface of the sedimentary layer is lowered, so that the incineration residue on the post-combustion stoker 93 may flow down and the tip grate of the post-combustion stoker 93 may be exposed and burned. On the other hand, if the amount of deposit is large, the deposit thickness becomes higher than that of the post-combustion stoker, and the waste on the stokers 91, 92, and 93 is not stably sent, and there is a problem that combustion becomes unstable.

As a technique for dealing with the problem caused by such fluctuation of the deposit thickness, the method shown in Patent Document 1 has been developed (Patent Document 1).

Japanese Unexamined Patent Publication No. 63-14808

According to the technique disclosed in Patent Document 1, the timing of ash discharge from the combustion completion device is determined according to the temperature of the ash deposited on the combustion completion device and the elapsed time from the immediately preceding ash discharge.

According to such a method, the amount of unburned content contained in the incineration residue is determined by measuring the temperature of the incineration ash deposited on the combustion completion device using a temperature detector, and the combustion completion device is used. There is an effect that the residence time of the incineration residue in the above can be controlled and the incineration residue can be completely burned.

By the way, in such a control, when it is determined that the temperature of the incinerator residue is sufficiently lowered, the incinerator residue is discharged in the minimum time within a predetermined time range, and the incinerator residue is discharged one after another. As a result, the height of the sedimentary layer in the combustion completion device may decrease, and the tip grate, which is the final stage of the post-combustion stoker, may be exposed. Further, if it is determined that the temperature of the incinerator residue does not decrease, the time interval for discharging the incinerator residue becomes long, the height of the sedimentary layer rises, and the incinerator residue may be discharged without complete combustion. Since the amount of incineration residue generated differs depending on the quality of the waste charged, it is difficult to control the time interval of incineration residue discharge only by the elapsed time from the incineration residue discharge and the incineration residue temperature in the combustion completion device.

The present invention has been made in view of such a problem, and it is an object of the present invention to provide a combustion completion device capable of maintaining the accumulated thickness of incineration residue in an appropriate state while preventing burning of the tip grate. The purpose.

The present invention provides the following solutions.

In the invention according to the first feature, the incinerator discharged from the incinerator can be deposited, the combustion completion air supplied from below can flow through, and the incinerator is discharged from the lower layer side at predetermined time intervals. An incinerator residue discharge mechanism, an incinerator residue discharge chamber located below the incinerator residue discharge mechanism, a combustion completion air supply means for supplying combustion completion air from the incinerator residue discharge chamber to the incinerator residue discharge mechanism, and an incinerator residue discharge mechanism. It is a combustion completion device provided with a control means for controlling the time interval of discharge by the mechanism, and is provided with a deposit thickness detecting means for detecting the deposit thickness of the incinerator residue deposited in the incinerator residue discharge mechanism, and the control means is the deposit thickness detection. Provided is a combustion completion device that controls the time interval of discharge and / or the transfer rate of the stoker by the incinerator residue discharge mechanism so that the deposit thickness detected by the means falls within a predetermined range.

According to the invention according to the first feature, the incinerator residue is deposited by controlling the discharge time interval and / or the transfer rate of the stoker so that the deposit thickness of the incinerator residue deposited in the combustion completion device is within a predetermined range. A sufficient thickness can be obtained, and the unburned portion in the incinerator residue can be completely burned. Then, to solve the problem of air blow-by to complete combustion due to insufficient deposition thickness, the problem of burning of the grate at the tip of the post-combustion stoker, and the problem of instability of combustion due to the incineration residue becoming too thick. Can be done.

The invention according to the second feature is an invention according to the first feature, which includes a pressure detector for detecting the pressure in the incineration residue discharge chamber as a deposit thickness detecting means, and the control means detects with the pressure detector. The time interval of discharge and / or the transfer speed of the stoker is controlled by the incineration residue discharge mechanism so that the pressure applied is within a predetermined range.

According to the invention according to the second feature, a pressure detector for detecting the pressure in the incinerator residue discharge chamber is used as the deposit thickness detecting means. Since the pressure in the incineration residue discharge chamber depends on the accumulation thickness of the incineration residue deposited on the incineration residue discharge mechanism, the discharge time interval and / or the transfer rate of the stoker is controlled so that the accumulation thickness of the incineration residue is within a predetermined range. By doing so, the accumulated thickness of the incineration residue can be sufficiently taken, and the unburned portion in the incineration residue can be completely burned. Then, to solve the problem of air blow-by to complete combustion due to insufficient deposition thickness, the problem of burning of the grate at the tip of the post-combustion stoker, and the problem of instability of combustion due to the incineration residue becoming too thick. Can be done.

The invention according to the third feature is the invention according to the first feature, which includes, as a deposit thickness detecting means, a first level meter for detecting the height position of the incinerator residue deposited in the incinerator residue discharge mechanism. The control means controls the time interval of discharge and / or the transfer speed of the stoker by the incinerator residue discharge mechanism so that the height of the incinerator residue detected by the first level meter falls within a predetermined range.

According to the invention according to the third feature, as the deposit thickness detecting means, a first level meter for detecting the height position of the incineration residue deposited in the incinerator residue discharge mechanism is used. Since the deposit height detected by the first level meter has a one-to-one relationship with the deposit thickness, the discharge time interval and / or the transfer rate of the stoker is based on the height of the incinerator residue deposited in the incinerator residue discharge mechanism. By controlling the above, the thickness of the incinerator residue can be sufficiently taken, and the unburned component in the incinerator residue can be completely burned. Then, to solve the problem of air blow-by to complete combustion due to insufficient deposition thickness, the problem of burning of the grate at the tip of the post-combustion stoker, and the problem of instability of combustion due to the incineration residue becoming too thick. Can be done.

The invention according to the fourth feature is an invention according to any one of the first to third features, and is a second level meter that detects the height position of the upper end of the incineration residue on the tip grate in the incinerator of the stoker type. Further, the control means controls the transfer speed of the stoker so that the incinerator residue thickness calculated from the accumulated height of the incinerator residue on the tip grate detected by the second level meter does not become 200 mm or less.

According to the invention according to the fourth feature, the incinerator residue on the grate having a certain thickness or more is maintained by keeping the deposit thickness on the tip grate calculated from the height detected by the second level meter at a predetermined value or more. It can be covered with, and it is possible to prevent the grate from being burned by the radiant heat from the incinerator. Then, by performing the control to keep the accumulated thickness of the incineration residue accumulated on the combustion completion device within a predetermined range, the supply rate of the incineration residue to the incineration residue discharge mechanism by the post-combustion stoker and the incineration residue discharge mechanism It is possible to properly link with the discharge frequency of the incineration residue from the combustion, prevent the grate of the post-combustion stoker from burning, prevent the air for completing combustion from blowing through, and burn the waste on the stoker due to poor feeding. Unstableness can be prevented and unburned components contained in the incineration residue can be completely burned.

According to the present invention, it is possible to provide a combustion completion device capable of maintaining the accumulated thickness of the incineration residue in an appropriate state while preventing the tip grate from burning.

FIG. 1 is a schematic view showing a stoker-type incinerator including a combustion completion device according to the present embodiment. FIG. 2 is a schematic view showing a combustion completion device according to the present embodiment. FIG. 3 is a flow chart showing a combustion completion method according to the first embodiment. FIG. 4 is a flow chart showing a combustion completion method according to the second embodiment. FIG. 5 is a flow chart showing a combustion adjusting method according to the third embodiment. FIG. 6 is a schematic view showing a stoker-type incinerator according to the prior art.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that this is only an example, and the technical scope of the present invention is not limited to this.

[Overall configuration of stoker-type incinerator]
The overall configuration of the stoker-type incinerator including the combustion completion device according to the present embodiment will be described with reference to FIG.

As shown in FIG. 1, the stoker-type incinerator of the present embodiment incinerates atypical general waste and waste such as industrial waste, and is upstream of the flow of input waste. A combustion chamber 10 including a drying stoker 11, a combustion stoker 12, and a post-combustion stoker 13, a supply device 20 for supplying waste to the combustion chamber 10, a combustion completion device 30, and a cooling water tank 40 are provided in this order.

The supply device 20 is composed of a supply means such as a hopper and a pusher for temporarily storing waste, and intermittently stores the waste supplied to the supply device 20 by a waste crane from a waste pit (not shown). It can be charged into the combustion chamber 10.

The waste supplied to the combustion chamber 10 by the supply device 20 is treated by the air supplied from below the grate on the grate provided by the drying stoker 11, the combustion stoker 12, and the post-combustion stoker 13. The plurality of grate provided by the dry stoker 11, the combustion stoker 12, and the post-combustion stoker 13 each slide back and forth at a predetermined transfer speed, and the waste supplied to the combustion chamber 10 slides on the grate. Alternatively, it proceeds to the downstream side of the combustion chamber 10, that is, the combustion completion device 30 side while drying or burning along with the shaking. Air is supplied to each grate from below by an air supply means (not shown), and the waste on the grate is dried, burned, and post-combusted by the air according to each stage. That is, dry air is supplied to the dry grate 11 from below, and the waste on the dry stoker 11 is dried by evaporating the moisture by the dry air and supplied to the combustion stoker 12. Combustion air is supplied to the combustion stoker 12 from below, and the waste on the combustion stoker 12 is burned by the combustion air and supplied to the post-combustion stoker 13. Post-combustion air is supplied to the post-combustion stoker 13 from below, and the waste on the post-combustion stoker 13 is post-combusted by the post-combustion air. The waste post-combusted by the post-combustion stoker 13 is sent to the combustion completion device 30. The incinerator residue sent to the combustion completion device 30 is completely burned by the combustion completion device 30, and is discharged to the cooling water tank 40 provided below.

[Combustion completion device configuration]
The combustion completion device 30 according to the present embodiment will be described with reference to FIG.

The combustion completion device 30 is provided to completely burn the unburned portion contained in the incineration residue generated by burning the waste in the combustion chamber 10 of the incinerator of the stoker type, and temporarily burns the incineration residue. The incinerator residue discharge mechanism 31 that can be deposited in the incinerator and is discharged downward at a predetermined frequency, the incinerator residue discharge chamber 32 that can be sealed from the outside and is located below the incinerator residue discharge mechanism 31, and the incinerator residue. It is composed of a combustion completion air supply means 33 that supplies combustion completion air via a discharge chamber 32. Below the incinerator residue discharge chamber 32, a cooling water tank 40 for water-cooling the incinerator residue discharged through the incinerator residue discharge chamber 32 is provided. The cooling water tank 40 is provided with a well-known ash discharge means (not shown) for discharging ash from the cooling water tank. In the present embodiment, the incinerator residue discharge chamber 32 is sealed to the outside by communicating the lower end of the incinerator residue discharge chamber 32 with the cooling water tank 40.

In the present embodiment, the incinerator residue discharge mechanism 31 is inverted so that the incinerator residue discharged from the combustion chamber 10 of the incinerator can be deposited and the deposited incineration residue can be discharged from the lower layer at a predetermined frequency. A reversing rostrum is used that opens and closes. In FIG. 2, the solid line indicates the state in which the incineration residue can be deposited, and the two-dot chain line indicates the state in which the incineration residue is discharged. Further, the incinerator residue discharge mechanism 31 is configured to be able to pass through the combustion completion air supplied from below. The incinerator residue discharge mechanism 31 also uses a gate-type rostrum or the like that can be opened and closed as long as the incinerator residue can be deposited, the lower layer side can be discharged at predetermined intervals, and air can flow through. It does not have to be an inverted rostrum.

Further, above the incineration residue discharge mechanism 31, a first level total 51 for detecting the accumulated height of the incineration residue deposited on the incineration residue discharge mechanism 31 is provided. Further, above the incinerator residue discharge mechanism 31, a second level total 52 for detecting the accumulated height of the incinerator residue deposited on the tip grate 13e, which is the final stage of the post-combustion stoker 13, is provided. The first level meter 51 functions as an embodiment of the deposit thickness detecting means in the present invention. Further, the first level total 51 and the second level total 52 are installed above the incineration residue discharge mechanism 31 and on the ceiling portion of the stoker type incinerator, but if the deposit height can be detected, they can be detected. The installation location is not limited to this.

The incineration residue discharge chamber 32 is a substantially vertically arranged path through which the incineration residue discharged from the incineration residue discharge mechanism 31 passes and the combustion completion air supplied from the combustion completion air supply means 33 passes. Is. The lower end of the incinerator residue discharge chamber 32 communicates with the cooling water tank 40 provided below, and the incinerator residue discharge chamber 32 is sealed from the outside.

Further, the incinerator residue discharge chamber 32 is provided with a pressure detector 53, and the pressure detector 53 detects the pressure in the incinerator residue discharge chamber 32 as the pressure below the incinerator residue discharge mechanism 31. The pressure detector 53 functions as an embodiment of the deposit thickness detecting means in the present invention.

The combustion completion air supply means 33 supplies the combustion completion air to the incineration residue accumulated in the incineration residue discharge mechanism 31 through the incineration residue discharge chamber 32, and is not shown in a blower or an air heater. , Dampers, etc.

The control means 60 controls the discharge frequency of the incinerator residue discharge mechanism 31 and the transfer speed of the post-combustion stoker 13 based on the detection results of the first level meter 51, the second level meter 52, and the pressure detector 53.

[Combustion completion flow]
Next, with reference to FIGS. 3 and 4, the flow of completion of combustion of the incineration residue using the combustion completion device according to the first and second embodiments will be described. The situation in which the incinerator residue is already accumulated on the incinerator residue discharge mechanism 31 during the normal combustion operation will be described.

<Embodiment 1>
First, the combustion completion operation according to the first embodiment will be described with reference to FIG. In the first embodiment, the pressure detector 53 arranged in the incinerator residue discharge chamber 32 is used as the deposit thickness detecting means.

[Step S100: Pressure detection]
First, the pressure detector 53 detects the pressure in the incinerator residue discharge chamber 32 as the pressure below the incinerator residue discharge mechanism 31 (step S100).

[Step S110: Determination of pressure detection result]
When the pressure detection is started in step S100, the control means 60 executes a process of determining whether or not the pressure detection result falls within a predetermined range (step S110).

[Step S120: Adjustment of discharge frequency and / or transfer speed]
When it is determined in step S110 that the pressure detection result does not fall within the predetermined range (Y in step S110), the control means 60 incinerates by the incinerator residue discharge mechanism 31 so that the pressure detection result falls within the predetermined range. Adjust the discharge frequency of the residue and / or the transfer rate of the stokers 11, 12, and 13 (step S120). Then, step S110 and step S120 are repeated until the pressure detection result falls within a predetermined range.

In this way, the desired deposit thickness can be maintained by adjusting the discharge frequency of the incinerator residue based on the detection result by the pressure detector 53. This will be described below.

When the incineration residue is deposited above the incineration residue discharge mechanism 31, the incinerator residue discharge chamber 32 to which air for completing combustion is supplied and the incinerator residue discharge mechanism 31 communicating with the combustion chamber 10 of the incinerator type incinerator There is a pressure difference between the upper part and the upper part. As the accumulated thickness of the incineration residue deposited on the incineration residue discharge mechanism 31 increases, the pressure difference between the upper side and the lower side increases. Therefore, the accumulated thickness can be estimated by detecting the pressure difference. In particular, since the combustion chamber 10 is controlled to maintain a predetermined negative pressure with respect to the atmospheric pressure, the incinerator residue discharge mechanism 31 is measured by measuring the pressure of the incinerator residue discharge chamber 32 below the incinerator residue discharge mechanism 31. The pressure difference between the upper and lower sides can be detected, and as a result, the accumulated thickness of the incinerator residue deposited on the incinerator residue discharge mechanism 31 can be estimated. In this way, the pressure detector 53 functions as a deposit thickness detecting means.

If the deposit thickness is insufficient, the incinerator residue discharge mechanism 31 will blow through the combustion completion air, and complete combustion will not be possible. In addition, the grate of the post-combustion stoker 13 may be exposed in the furnace and burned. However, according to the present embodiment, when the pressure detected by the pressure detector 53 falls below a predetermined lower limit value, it is determined that the deposit thickness is insufficient, and the discharge frequency by the incinerator residue discharge mechanism 31 is determined. That is, by adjusting the control means 60 so as to lengthen the time interval of discharge, it is possible to secure a sufficient deposit thickness so that the air for completing combustion does not blow through. Then, by adjusting the discharge frequency so that the pressure detected by the pressure detector 53 does not fall below a predetermined lower limit value, the unburned portion contained in the incinerator residue can be completely burned.

Further, if the deposit thickness above the incinerator residue discharge mechanism 31 becomes too thick, the feed of waste on the stokers 11, 12, and 13 becomes unstable, so that combustion on the stokers 11, 12, and 13 is not possible. It becomes stable, and there is a risk that the temperature will drop and carbon monoxide will be generated. However, according to the present embodiment, when the pressure detected by the pressure detector 53 exceeds a predetermined upper limit value, it is determined that the deposit thickness is excessive, and the discharge frequency by the incinerator residue discharge mechanism 31 is determined. That is, by adjusting the control means 60 so as to shorten the discharge time interval, the deposit thickness in the incinerator residue can be suppressed to such an extent that the temperature does not decrease. Then, by adjusting the discharge frequency and / or the transfer speed of the stoker so that the pressure detected by the pressure detector 53 does not exceed a predetermined upper limit value, the unburned portion contained in the incinerator residue is completely burned. Can be discharged.

Here, when the deposit thickness above the incinerator residue discharge mechanism 31 becomes too thick, the combustion state is adjusted appropriately by controlling not only the discharge frequency of the incinerator residue discharge mechanism 31 but also the transfer speed of the stokers 11, 12, and 13. The incineration residue can be completely burned. This will be described below.

If the deposit thickness above the incinerator residue discharge mechanism 31 becomes too thick, the feed of waste on the stokers 11, 12, and 13 becomes unstable, and the flow of waste may be blocked on the stokers 11, 12, and 13. be. Therefore, when the pressure detected by the pressure detector 53 exceeds a predetermined upper limit value set in advance, the transfer speed of the stalker 11, 12, 13 is adjusted to increase the transfer speed of the stalker 11, 12, 13 on the stalker 11, 12, 13. By promptly supplying the waste that may be stagnant to the downstream side and maintaining the proper flow of the waste, it is possible to prevent the temperature drop and the generation of carbon monoxide due to unstable combustion. By performing such control alone or in combination with the control of the discharge frequency of the incinerator residue discharge mechanism 31, combustion on the stokers 11, 12, and 13 can be maintained properly, and the unburned residue contained in the incinerator residue can be maintained. The minutes can be completely burned before being discharged.

In this way, the discharge frequency of the incinerator residual discharge mechanism 31 and / or the transfer speed of the stokers 11, 12, and 13 are adjusted so that the pressure detected by the pressure detector 53 falls between the predetermined upper limit value and the lower limit value. By doing so, incomplete combustion due to the atrium of the air for completing combustion, burning of the grate, and instability of combustion due to instability of waste feed are suppressed, and the unburned content contained in the incinerator residue is completely eliminated. It can be burned and then discharged.

<Embodiment 2>
Next, the flow of the combustion completion operation in the second embodiment will be described with reference to FIG. In the second embodiment, the first level total 51 arranged above the incinerator residue discharge mechanism 31 is used as the deposit thickness detecting means.

In the first embodiment, the deposit thickness on the incinerator residue discharge mechanism 31 was estimated from the pressure measurement result below the incinerator residue discharge mechanism 31, but in the second embodiment, the first arrangement above the incinerator residue discharge mechanism 31. Using the level meter 51, the deposit height of the incinerator residue deposited on the incinerator residue discharge mechanism 31 is directly detected, and the deposit thickness is calculated from the deposit height.

[Step S200: Detection of deposit height]
First, the first level meter 51 detects the height of the incineration residue deposited above the incinerator residue discharge mechanism 31 (step S200).

[Step S210: Determining the deposit height detection result]
When the detection of the accumulated height of the incineration residue is started in step S200, the control means 60 executes a process of determining whether or not the detection result of the accumulated height falls within a predetermined range (step S210).

[Step S220: Adjustment of discharge frequency and / or transfer speed]
If it is determined in step S210 that the deposit height detection result does not fall within the predetermined range (Y in step S210), the control means 60 discharges the incinerator residue so that the deposit height detection result falls within the predetermined range. The discharge frequency of the incinerator residue by the mechanism 31 and / or the transfer rate of the stokers 11, 12, and 13 are adjusted (step S220). Then, step S210 and step S220 are repeated until the detection result of the deposit height falls within a predetermined range.

Here, since the distance from the first level meter 51 to the incinerator residue discharge mechanism 31 is constant regardless of the deposit thickness, there is a one-to-one relationship between the deposit height and the deposit thickness detected by the first level meter 51. be. Therefore, the first level meter 51 functions as a deposit thickness detecting means. In this way, by adjusting the discharge frequency of the incinerator residue and / or the transfer rate of the stoker based on the detection result by the first level meter 51, the desired deposition thickness is maintained and the unburned residue contained in the incinerator residue is contained. Minutes can be completely burned.

If the deposit thickness is insufficient, the incinerator residue discharge mechanism 31 will blow through the combustion completion air, and complete combustion will not be possible. In addition, the grate of the post-combustion stoker 13 may be exposed in the furnace and burned. However, according to the present embodiment, when the deposit height detected by the first level total 51 is less than a predetermined lower limit value, it is determined that the deposit thickness is insufficient, and the incinerator residue discharge mechanism 31 By adjusting the discharge frequency, that is, the time interval of discharge, by adjusting the control means 60, it is possible to secure a sufficient deposit thickness so that the air for completing combustion does not blow through. Then, by adjusting the discharge frequency so that the deposit height detected by the first level total 51 does not fall below a predetermined lower limit value, the unburned portion contained in the incinerator residue can be completely burned.

Further, if the deposit thickness above the incinerator residue discharge mechanism 31 becomes too thick, the feed of waste on the stokers 11, 12, and 13 becomes unstable, so that the combustion on the stokers 11, 12, and 13 becomes unstable. There is a risk that the temperature will drop and carbon monoxide will be generated. However, according to the present embodiment, when the deposit height detected by the first level total 51 exceeds a predetermined upper limit value, it is determined that the deposit thickness is excessive, and the incinerator residue discharge mechanism 31 determines. By adjusting the discharge frequency, that is, the time interval of discharge, by adjusting the control means 60, the deposit thickness in the incinerator residue can be suppressed to such an extent that the temperature does not decrease. Then, by adjusting the discharge frequency and / or the transfer rate of the stoker so that the deposition height detected by the first level total 51 does not exceed a predetermined upper limit value, the unburned portion contained in the incinerator residue is completely burned. It can be discharged after being allowed to.

Here, when the deposit thickness above the incinerator residue discharge mechanism 31 becomes too thick, not only the discharge frequency of the incinerator residue discharge mechanism 31 but also the transfer speed of the stokers 11, 12, and 13 can be controlled independently or the discharge frequency. It is the same as that of the first embodiment in that the combustion state can be maintained properly by performing the control in combination with the above.

In this way, the discharge frequency of the incinerator residual discharge mechanism 31 and / or the transfer of the stokers 11, 12, and 13 so that the deposit height detected by the first level total 51 falls between the predetermined upper limit value and the lower limit value. By adjusting the speed, incomplete combustion due to the atrium of the air for completing combustion, burning of the grate, and instability of combustion due to instability of waste feed are suppressed, and unburned content contained in the incinerator residue is suppressed. The minutes can be completely burned before being discharged.

<Embodiment 3>
Next, the combustion adjustment flow in the third embodiment will be described with reference to FIG. In the first and second embodiments, the deposition frequency and / or the transfer speed of the stoker was adjusted by estimating the deposit thickness above the incinerator residue discharge mechanism 31, but in the third embodiment, the final stage of the post-combustion stoker 13 Using the second level meter 52 arranged above the tip grate 13e, which corresponds to the tip grate 13e, the height of the incineration residue deposited above the tip grate 13e is directly detected to adjust the combustion.

[Step S300: Detection of deposit height]
First, the second level meter 52 detects the height of the incineration residue deposited above the tip grate 13e, which is the final stage of the post-combustion stoker 13 (step S300).

[Step S310: Determining the deposit height detection result]
When the detection of the accumulated height of the incineration residue is started in step S300, the control means 60 calculates the accumulated thickness on the tip grate 13e from the detected accumulated height, and the accumulated thickness is within a predetermined range, that is, 200 mm. A process of determining whether or not to exceed is executed (step S310).

[Step S320: Adjustment of transfer speed]
If it is determined in step S310 that the deposit thickness remains 200 mm or less (Y in step S310), the control means 60 adjusts the transfer rate of the post-combustion stoker 13 so that the deposit thickness exceeds 200 mm (step S320). Then, step S310 and step S320 are repeated until the deposit thickness exceeds 200 mm.

In this way, by adjusting the transfer rate of the post-combustion stoker 13 based on the detection result by the second level meter 52, the desired deposition thickness is maintained and the grate is prevented from being burnt by the radiant heat from the incinerator. be able to.

If the accumulated thickness of the incineration residue on the post-combustion stoker 13 is insufficient, the grate of the post-combustion stoker 13 may be exposed in the furnace and burned by receiving radiant heat from the incinerator. However, according to the present embodiment, when the incineration residue thickness calculated from the deposit height detected by the second level total 52 is less than the lower limit of 200 mm, it is determined that the deposit thickness is insufficient and the post-combustion stoker is used. By adjusting the transfer speed of 13 by the control means 60, it is possible to secure a sufficient deposit thickness so that the grate is not exposed. Then, by adjusting the transfer speed of the post-combustion stoker 13 so that the deposit thickness calculated from the deposit height detected by the second level meter 52 does not fall below the lower limit of 200 mm, the burnout of the grate is prevented. be able to.

In this way, by adjusting the transfer rate of the post-combustion stoker 13 so that the deposit thickness calculated from the deposit height detected by the second level total 52 does not fall below a predetermined lower limit value, the deposit thickness is insufficient. It is possible to prevent burning due to exposure of the grate.

Then, the transfer speed of the post-combustion stoker 13 is controlled based on the detection result of the second level meter 52, and the discharge frequency of the incineration residue discharge mechanism 31 is controlled based on the detection result of the pressure detector 53. Alternatively, by combining the control of the discharge frequency of the incineration residue discharge mechanism 31 based on the detection result of the first level meter 51, the supply rate of the incineration residue to the incineration residue discharge mechanism 31 by the post-combustion stoker 13 and the incineration The frequency of discharge of incineration residue from the residue discharge mechanism 31 can be appropriately linked, and while preventing the grate of the post-combustion stoker 13 from burning, it is possible to prevent the air for completing combustion from blowing through and to lower the temperature of the incineration residue. It is possible to prevent the occurrence of incomplete combustion that accompanies it, and to completely burn the unburned components contained in the incineration residue.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments described above. In addition, the effects described in the embodiments of the present invention merely list the most preferable effects arising from the present invention, and the effects according to the present invention are limited to those described in the embodiments of the present invention. is not it.

Further, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations.

The combustion completion device of the present invention can be applied to a waste incineration facility that incinerates various wastes such as household waste, industrial waste, medical waste, and sewage sludge. Further, the technique of the present invention can be applied not only to a waste incineration facility that incinerates waste, but also to a combustion device that deposits and burns various solid fuels including biomass in the lower part of a combustion chamber.

1 Stoker type incinerator 10 Combustion chamber 11 Drying stoker 12 Combustion stoker 13 Post-combustion stoker 13e Tip grate 20 Supply device 30 Combustion completion device 31 Incineration residue discharge mechanism 32 Incineration residue discharge chamber 33 Air supply means for combustion completion 40 Cooling water tank 51 First level meter 52 Second level meter 53 Pressure detector 60 Control means

Claims (5)

The incinerator discharge mechanism that can deposit the incinerator discharged from the incinerator, allows the air for completion of combustion supplied from below to flow through, and discharges the incinerator from the lower layer side at predetermined time intervals, and the above. An incinerator residue discharge chamber located below the incinerator residue discharge mechanism, a combustion completion air supply means for supplying combustion completion air from the incinerator residue discharge chamber to the incinerator residue discharge mechanism, and discharge by the incinerator residue discharge mechanism. An incinerator complete device including a control means for controlling a time interval.
A deposit thickness detecting means for detecting the deposit thickness of the incinerator residue deposited on the incinerator residue discharge mechanism is provided.
The control means controls the time interval of discharge and / or the transfer rate of the stoker by the incineration residue discharge mechanism so that the deposit thickness detected by the deposit thickness detecting means falls within a predetermined range. Complete device. As the deposit thickness detecting means, a pressure detector for detecting the pressure in the incinerator residue discharge chamber is provided.
The control means is characterized in that the time interval of discharge by the incinerator residue discharge mechanism and / or the transfer speed of the stoker is controlled so that the pressure detected by the pressure detector falls within a predetermined range. The combustion completion device according to 1. As the deposit thickness detecting means, a first level meter for detecting the height position of the incineration residue deposited on the incineration residue discharge mechanism is provided.
The control means controls the discharge time interval and / or the transfer speed of the stoker by the incinerator residue discharge mechanism so that the height of the incinerator residue detected by the first level meter falls within a predetermined range. The combustion completion device described in. Further equipped with a second level meter for detecting the height position of the upper end of the incineration residue on the tip grate in the stoker type incinerator.
The control means controls the transfer rate of the stoker so that the incineration residue thickness calculated from the deposition height of the incinerator residue on the tip grate detected by the second level meter does not become 200 mm or less. The combustion complete device according to any one of 1 to 3. The incinerator discharge mechanism that can deposit the incinerator discharged from the incinerator, allows the air for completing combustion from below to flow through, and discharges the incinerator at predetermined time intervals , and the incinerator discharge mechanism. The incinerator residue discharge chamber located below, the combustion completion air supply means for supplying combustion completion air from the incinerator residue discharge chamber to the incinerator residue discharge mechanism, and the time interval of discharge by the incinerator residue discharge mechanism are controlled. It is a combustion completion method in a combustion completion device including a control means.
Step of detecting the accumulated thickness of the incineration residue deposited above the incineration residue discharge mechanism,
Combustion completion method comprising the steps, deposition thickness detected in step of controlling the transport speed of the time interval and / or stoker emissions by the incineration residue渣排out mechanism to fit within a predetermined range for detecting the deposition thickness.

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