JPH04174210A - Detecting method for combustion control indication for incinerator - Google Patents

Abstract

PURPOSE:To obtain an appropriate combustion control guidance free from human operation error by feeding the difference in value between the actual incineration rate and preset incineration rate obtained from specific formulas into PID circuit as input value. CONSTITUTION:A difference between the actual incineration rate PV obtained from the formula I (wherein Wt is the amount of rubbish to be admitted at time t and tg is an average time that the rubbish is thrown in) and a preset inclination rate SV obtained from the formula II (Wd is rated amount of rubbish burned per day by an incinerator and h is time) is computed. The resulting value is fed into PID circuit 15 and the rubbish conveying amount control indication MV thus obtained is set as the guide line for each of control factors for the incinerator 1. Therefore, the larger (smaller) the value of the actual incineration rate PV becomes relative to the value of the preset inclination rate SV, the smaller (larger) the value of the rubbish conveying amount control indication MV becomes. Even if the rubbish held in a bucket 4 by the operator is of an uneven volume, since the value of the actual incineration rate PV is not affected, the rubbish conveying amount control indication MV always becomes an appropriate combustion control guidance free from human operation error.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for detecting a combustion control index for an incinerator for incinerating garbage or the like.

BACKGROUND OF THE INVENTION Conventionally, the bulk specific gravity of garbage (waste quality) has been used as an index for controlling the combustion behavior of an incinerator. In an incinerator, waste is placed into a hopper of the incinerator by a packet operated by an operator, and is placed into the interior of the incinerator by a pusher from the bottom of the hopper.

At this time, the bulk specific gravity 2Ks is determined by the following formula.

Here, tk: Moving average of bulk specific gravity, Wt: Amount (weight) of garbage thrown in by packet at time t, ■c: Packet capacity, Ng: tk waiting time Number of times of throwing in.

Problems to be Solved by the Invention However, as mentioned above, bulk specific gravity is calculated from the amount of garbage thrown into the packet and the packet capacity, but it is difficult for the operator who operates the packet to always grasp the average amount of garbage. Therefore, there was a problem that errors occurred.

The present invention solves the above problems and provides a combustion control index detection method that can detect appropriate indexes for operating each combustion control element such as the amount of combustion air in an incinerator and the stoker speed. The purpose is to

Means for Solving the Problems In order to solve the above problems, the combustion control index detection method of the present invention is calculated using the following formula 2, where Wt is the amount of garbage input at time t, and tg is the moving average time of the amount of garbage input. Pv: Calculate the difference between the actual incineration rate and the rated incineration amount of the incinerator on Wd knee day, h: time, and SV: Set incineration rate calculated using the following formula %, and input the calculated difference value. The configuration is such that the Mv (garbage conveyance amount control index), which is input as a value to the PID circuit and output from the PID circuit, is used as an index for each control element of the incinerator.

Effect With the above-mentioned configuration, the larger the PV value is relative to the Sv value, that is, the heavier the waste quality, the smaller the MV value becomes. The lighter the weight, the larger the MV value.

Furthermore, even if the garbage that the operator picks up in the packet when putting garbage into the incinerator hopper has an uneven volume, the value of Pv is not affected, so MV is always free from human operational errors. It serves as an appropriate combustion control index.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In Figures 2 to 2, an incinerator 1 is provided with a hopper 3 as a mouth for charging the waste 2, and above the hopper 3 there is a bulk bucket 4 for charging the waste 2 into the hopper 3.
A crane with a Also, hopper 3
A pusher 5 for cutting out the waste 2 inside the incinerator 1 is arranged at the bottom of the incinerator 1.

A drying zone 6 and a plurality of combustion zones 7 are formed inside the incinerator 1, and each zone 6.degree. 7 is provided with a stoker 8 for sequentially feeding the waste 2. Further, an air supply duct 9 for supplying dry air and combustion air is arranged below each zone 6, 7, and a damper 10 is arranged in the air supply duct 9 corresponding to each zone 6, 7. has been done.

The pusher 5, stoker 8, and damper lO are control elements for controlling the combustion state of the incinerator 1, and in order to control each control element, a pusher control circuit 11, a damper control circuit 12, and a stoker control circuit are used. 13 are provided. Further, a combustion control index detection circuit 14 for indicating a control index is connected to each control circuit. This combustion control index detection circuit 14 is formed of a PID circuit (proportional+differential in integral) 15.

Hereinafter, the effects of the above configuration will be explained.

Garbage 2 is placed into the hopper 4 by an operator using a packet 4, and the amount (1) of garbage thrown in each time is measured using a scale installed in the bulk bucket 4, and the measured amount of garbage thrown in is used as a combustion control index. The signal is input to the detection circuit 14. Also, hopper 4
7 Garbage 2 thrown into the incinerator 1 is sent by pusher 5
The raw material is cut out into a drying zone 6, and thereafter sent to each combustion zone 7 sequentially by a stoker 8. During this time, each band 6, 7
Dry air and combustion air are supplied from below to the air supply duct 9.
supplied through.

Then, in the combustion control index detection circuit 14, Wt:
PV: Actual incineration rate and rated incineration amount (t) of the incinerator on day Wd, h : Calculate the difference value between Sv and the set incineration rate calculated as time using the following formula % formula %, input the calculated difference value as an input value to the PID circuit 15, and
MV output from the D circuit 15: Calculate the garbage transport amount control index. This MV becomes smaller as the value of Pv becomes larger with respect to Sv, that is, as the quality of waste becomes heavier, and as the value of PV becomes smaller with respect to the value of Sv, that is, as the quality of waste becomes lighter, its value decreases. becomes larger.

Then, the calculated MV is calculated for each control circuit 11, 12 . H is input as a combustion control index, and the operation amount (number of times) of the busher 5, the feed speed of the soot car 8-, and the opening degree of the damper 10 are controlled according to the waste quality.

Therefore, even if the garbage 2 that the operator grabs with the packet 4 when charging it into the hopper 3 of the incinerator 1 has an uneven capacity, the value of Pv is not affected, so the MV
is always an appropriate combustion control index without human error.

Effects of the Invention As described above, according to the present invention, the Pv value is not affected even if the garbage that the operator picks up in the packet in the hopper of the incinerator has an uneven volume when throwing the garbage into the hopper of the incinerator. , MV can always be used as an appropriate combustion control index without human operation errors.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an incinerator showing an embodiment of the present invention;
FIG. 2 is a block diagram of the control circuit in the same embodiment. 1...Incinerator, 2...Garbage, 3...Hopper, 4
... Packet, 5... Pusher, 8... Stalker-110... Damper, 14... Combustion control index detection circuit.

Claims (1)

[Claims] 1. Wt: amount of garbage input at time t, tg: moving average time of amount of garbage input, PV: Actual incineration rate calculated by the following formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ PV: Actual incineration rate, Wd: Calculate the difference between the rated incineration amount of the incinerator per day, h: time, and the SV: set incineration rate determined by the following formula: SV=Wd/24h, and input the calculated difference value as an input value to the PID circuit. , a method for detecting a combustion control index for an incinerator, characterized in that the MV: garbage transport amount control index output from a PID circuit is used as an index for each control element of the incinerator.