JPH0682021A - Combustion controller for garbage incinerator - Google Patents

Abstract

PURPOSE:To provide a combustion controller of a garbage incinerator which enables efficient burning at a burning zone by judging the presence of the generation of unburned garbage in a post burning zone accurately. CONSTITUTION:A drying zone A is arranged to dry matters to be burned, a burning zone B to burn the matters to be burned dried and a post burning zone C to turn the matters to be burned to ashes sequentially. A combustion controller thus obtained is for a stoker type garbage incinerator which is provided with an air supply means 8 to supply air for burning from below. A temperature detection means T is provided to detect a radiation temperature of the matters to be burned on the post burning zone C, a judging means 10a which supplies air for detecting temperature to the post burning zone C by the air supply means 8 to judge burning condition from temperature changes of the matters to be burned detected by the temperature detection means T during the supply of the air and a combustion control means 10 to perform a combustion control based on the results of the judgment of the judging means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying zone for drying an incineration object and a combustion zone for burning a dried incineration object.
The present invention relates to a combustion control device for a stoker-type refuse incinerator, which is provided with air supply means for sequentially arranging post-combustion zones for incineration of incineration materials and supplying combustion air from below.

[0002]

2. Description of the Related Art In order to promote the combustion of the incineration material itself in the post combustion zone (hereinafter referred to as solid combustion) and prevent the generation of unburned dust, gasification combustion (flame) in the combustion zone is used. Combustion control is performed so that the end position is detected using an optical detection sensor or temperature sensor, and the end position is located upstream of the set position, that is, the amount of the incineration object or the transfer of the incineration object by the stoker. The speed or the air supply amount was adjusted.

[0003]

According to the above-mentioned prior art, the presence or absence of unburned dust that is not sufficiently ashed in the post combustion zone is not directly detected, but the end of gasification combustion (flame) is terminated. It was determined that the position was a position where solid combustion was activated, and the end position of gasification combustion (flame) was adjusted so that a certain period of time from that point to the subsequent ashing could be secured. To be more specific, since the solid combustion time varies depending on the type of incineration object, assuming that the smoldering time is the longest, such as wood, ensure a sufficient time as the fixed time. Thus, the end position of gasification combustion (flame) was adjusted. Therefore, even if the incineration object can be incinerated in a relatively short time, as a result of adjusting the end position of gasification combustion (flame) so as to secure the above-mentioned fixed time, the combustion zone is effectively used. However, there is a drawback in that the incineration efficiency cannot be improved beyond a certain level because it cannot be burnt. An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

[0004]

In order to achieve this object, a characteristic configuration of a combustion control device for a refuse incinerator according to the present invention is as follows.
Temperature detection means for detecting the radiation temperature of the incineration object on the post combustion zone and temperature detection air are supplied to the post combustion zone by the air supply means, and at this time, the temperature detection means detects the temperature. It is characterized in that it is provided with a discriminating means for discriminating the combustion state from the temperature change of the incineration object, and a combustion control means for performing combustion control based on the discrimination result of the discriminating means.

[0005]

When the temperature detecting air is supplied to the post-combustion zone by the air supply means, solid combustion is promoted to raise the temperature unless the incinerated material is ashed, and the incinerated material is sufficiently or almost ashed. If the radiant temperature of the non-incineration product is detected by the temperature detecting means, the degree of ashing is appropriate from the state of change in the detected temperature, paying attention to the fact that the temperature decreases or the increasing tendency weakens if the temperature changes. Therefore, it is possible to perform combustion control effectively utilizing the combustion zone according to the result. For example, when the detected temperature tends to rise, the conveying speed in the post combustion zone is decreased, or the supply amount of combustion air is increased to promote solid combustion, while the detected temperature does not change or decreases. If there is a tendency, the transportation speed is increased or the amount of new dust supplied is increased to expand the gasification and combustion region on the combustion zone to efficiently combust.

[0006]

According to the present invention, the state of ashing in the post-combustion zone can be changed to the type of dust, as compared with the case where the end position of gasification combustion (flame) is detected and the position is adjusted. It is possible to provide a combustion control device for a refuse incinerator, which can effectively grasp a large area of a combustion zone for combustion of dust and can achieve further improvement of incineration efficiency because it can be properly grasped regardless of the situation.

[0007]

EXAMPLES Examples will be described below. As shown in FIG. 2, the incinerator for municipal waste conveys the materials to be incinerated (such as municipal waste) thrown into the hopper 3 to the combustion chamber 1 by the reciprocating drive of the pusher 2 provided below the incinerator. The ash burned in 1 is collected in the ash pit 4.

The combustion chamber 1 has a drying zone A for drying the incineration object and heating it to a temperature near the ignition point, a combustion zone B for burning the dried incineration object, and a post-combustion zone C for ashing the incineration object. Are arranged stepwise from the upper side to the lower side, and air supply means 8 for supplying combustion air from the lower side is provided. In the dry zone A, the combustion zone B, and the post-combustion zone C, fixed grate and movable grate are alternately arranged in the arrangement direction, and the relative movement of the grate in the arrangement direction stirs and conveys the dust. It is composed of a stoker type conveying means 5.

A waste heat boiler 12 is provided above the combustion chamber 1, and the combustion heat energy contained in the exhaust gas generated in the combustion chamber 1 is taken out in the form of steam and used for the energy of the generator 13. Dust and harmful gas are removed from the exhaust gas by the exhaust gas treatment facility 14 such as an electric dust collector, and the exhaust gas is exhausted from the chimney 15.

Next, the combustion control will be described. Although not described in detail, the combustion control means 10 incinerates a preset amount of refuse incinerated for one day, and further, in order to stably generate steam to be supplied to the generator 13, the pusher 2 and the transfer means 5 are provided.
The transport speed of the incineration object, the amount of air supplied from the air supply unit 8, and the like are adjusted. On the upper wall surface of the post-combustion zone C, a temperature detecting means T using a thermopile for adjusting the field of view from the middle stream of the post-combustion zone C to the downstream side and detecting the radiation temperature of the incineration object located in that range is provided. There is. As shown in FIG. 1, temperature detection air is supplied to the post-combustion zone C by the air supply means 8 separately from the combustion air supply by the above combustion control, and at that time, the temperature detection means T detects the temperature. Determination means 10 for determining the combustion state from the temperature change of the incinerated object
a is provided. More specifically, the determination unit 10a derives the time at which the dust in the visual field is not detected after the temperature detection by the temperature detection unit T is switched based on the transport speed of the transport unit 5, and the temperature detection air is generated at the time interval. The temperature is detected while controlling the air supply means 8 so as to supply. When the detected temperature rises due to the supply of the temperature detecting air, it is determined that the dust is in an unburned state, and the conveying speed is reduced while supplying the temperature detecting air until the temperature decreases. If the detected temperature does not drop or change due to the supply of temperature detection air, it is determined that the dust has completely burned and is in the ash state, the temperature detection air supply is stopped, and new dust is supplied. The combustion in the combustion zone B is promoted by increasing the amount and increasing the conveying speed.

Another embodiment will be described below. The supply time of the temperature detection air, that is, the ashing state detection time is not particularly limited and can be set appropriately.

In the above embodiment, the thermopile is used as the temperature detecting means, but the invention is not limited to this, and a pyroelectric element or other infrared detecting element can be used.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 Timing chart for temperature detection

[Fig. 2] Schematic configuration diagram of the incinerator

[Explanation of symbols]

 8 Air Supply Means 10 Combustion Control Means 10a Discriminating Means A Dry Zone B Combustion Zone C Post Combustion Zone T Temperature Detection Means

Claims (1)

[Claims] 1. A drying zone (A) for drying an incineration object,
An air supply means (8) for sequentially arranging a combustion zone (B) for burning the dried incineration object and a post-combustion zone (C) for ashing the incineration object, and supplying combustion air from below. A stoker-type refuse incinerator combustion control device comprising: a temperature detection means (T) for detecting a radiation temperature of an incineration object on the post-combustion zone (C); and an air supply means (8). By means of which temperature detection air is supplied to the post-combustion zone (C) by means of which the combustion state is discriminated from the temperature change of the incineration object detected by the temperature detection means (T).
And a combustion control means (10) for performing combustion control based on the discrimination result of the discrimination means, the combustion control device for a refuse incinerator.