JPH05141640A - Combustion control device for incinerator - Google Patents

Abstract

PURPOSE:To accurately detect a burn out position by discriminating whether or not any of temperature detection devices laid out along the carrier direction of incinerated articles in a grate switch over to solid combustion from gaseous combustion. CONSTITUTION:A fire grate G which forms the floor of a combustion zone 7 is incorporated with thermocouples T, which serves as temperature detection devices, in a total of twelve locations which includes three locations in the lateral direction and four locations in the carrier direction. A part of combustion control means 18 serves as a discrimination means 18a which discriminates a layout position of a thermocouple which shows a peak temperature along the carrier direction from a detection temperature by the thermocouples T from a burn out position which switches over to solid combustion from gaseous combustion. The thermocouples T and the discrimination means 18a constitute a position detection means D. This construction makes it possible to detect constantly a burn out position with high accuracy.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion zone provided with a conveying means for conveying a burning incineration object by a relative movement of front and rear grate in a front and rear direction, and an incineration object in the combustion zone. A burn-out position detecting means for detecting the end position of the gas combustion, and a combustion control means for increasing or decreasing the carrying speed of the carrying means so that the burn-off position detected by the burn-out position detecting means falls within a set range. The present invention relates to a combustion control device for an incinerator, which is configured to include.

[0001]

2. Description of the Related Art Conventionally, the burn-out position detecting means has been installed so as to overlook a plurality of light amount detecting elements arranged in a furnace along the conveying direction of an incinerated object and a downstream side to an upstream side in the conveying direction. There are industrial TV cameras, which judge the size of the flame, which indicates the degree of gas combustion, based on the amount of light and the level of brightness, and burn out the positions above and below a certain threshold. It was the position.

[0002]

However, in the case of using the above-described light amount detecting element, since the total light amount in the visual field within a certain range along the carrying direction is detected, it is expensive and expensive along the carrying direction. Unless the light amount detection element is placed, detailed position information within that range cannot be obtained, and in the case of using an industrial TV camera, dust that winds up in the furnace or dust that adheres to the camera lens becomes noise, and Accurate detection is not always possible. as a result,
The combustion state of the incineration object in the combustion zone is not maintained properly, the burnout position shifts to the downstream side and the incineration object is conveyed unburned to the post combustion zone, or the burnout position shifts to the upstream side. There was a drawback that the incineration efficiency decreased. Furthermore, in both cases, when it is judged that the burnout position is shifted to the upstream side, the cause is that the burnout position is really shifted to the upstream side due to the reduction of the incineration object, or There is also a drawback that it is not possible to judge whether the product is being conveyed as unburned due to the increase in. In view of the above-mentioned conventional drawbacks, an object of the present invention is to realize burn-out position detecting means capable of always detecting the burn-out position accurately and with high accuracy, and to maintain an appropriate combustion state.

[0003]

To achieve this object, the combustion control device for an incinerator according to the present invention is characterized in that the burn-out position detecting means is arranged in the grate along the conveying direction of the incineration object. This is because it is composed of a plurality of temperature detecting elements and a discriminating means for discriminating the position where the temperature detected by these temperature detecting elements is the highest as the burn-out position.

[0004]

[Operation] The incineration material thrown into the furnace is
First, gas combustion occurs in which the volatile components contained in the incineration material burn, then the solid combustion proceeds in which the incineration material itself burns, and finally ashing. By the way, the temperature detected by the temperature detecting element arranged in the grate is mainly the temperature of the incineration object itself deposited on the grate, and is detected by the temperature detecting element constituting the burnout position detecting means. If the temperature transitions from a low state to a high state, it can be determined that the transition time point is the transition point from gas combustion to solid combustion. Then, if it is determined which of the plurality of temperature detecting elements arranged along the conveying direction of the incineration object in the rustle is moving from the gas combustion to the solid combustion, which position in the combustion zone is the burnout position. It is possible to determine whether or not there is the arrangement interval of the temperature detection elements as the limit accuracy.

[0005]

According to the present invention, the burn-out position detecting means capable of always detecting the burn-out position accurately and accurately is realized, and the proper combustion is always maintained by adjusting and maintaining the burn-out position at the set burn-out position. It has become possible to provide a combustion control device for an incinerator that is brought into a state.

[0006]

EXAMPLES Examples will be described below. In an incinerator for municipal waste, as shown in FIG. 3, an incineration object accommodated in a hopper 3 is put into a combustion chamber 2 by a pusher 5 provided at a lower end portion of the incinerator, and the incineration in the combustion chamber 2 is completed. Extruder for ash 1
It is configured to collect in the ash pit 4 by 0. The combustion chamber 2 has a drying zone 6 for drying the dust put in by the pusher 5 and heating it near the ignition point, a combustion zone 7 for burning the dry dust, and ashing the dust burned in the combustion zone 7. Combustion zones 8 are arranged in a stepwise manner from the upper side to the lower side. Combustion including a blower 16 for supplying high-temperature combustion air to the bottom of each and a flow passage 17 and a damper provided in the flow passage 17. It is configured by providing a supply air supply means.

The pusher 5 pushes dust into the combustion chamber 2 by reciprocal driving by a hydraulic cylinder (not shown). The floors of the drying zone 6, the combustion zone 7, and the post-combustion zone 8 are provided with a transporting means S for stirring and transporting the incineration objects loaded thereon toward the downstream ash pit 4.
More specifically, as shown in FIG. 2, the transporting means S includes a frame body composed of a fixed frame 20 and a movable frame 21 slidable forward and backward with respect to the fixed frame 20, and a grate G alternated in the front-back direction. And the movable frame 21 is slid by the hydraulic cylinder C2 to relatively move the front and rear grate G diagonally in the vertical direction, and the incineration object thereon is stirred and conveyed. The combustion zone 7 includes a front combustion zone 7A and a rear combustion zone 7B.
The combustion control means 18, which will be described later, mainly burns dust in a gas in the front combustion zone 7A and completely solid-combusts it in the middle portion of the rear combustion zone 7B. The supply amount by the supply unit and the transfer speed by the transfer unit S are controlled.

As shown in FIG. 1, the grate G forming the floor of the combustion zone 7 has a total of 12 locations, three locations in the width direction and four locations in the transport direction, for thermocouples as temperature detecting elements. T is embedded in the combustion control means 18, which will be described later, and a part of the combustion control means 18 to be described later is moved from gas combustion to solid combustion at the position where the thermocouple showing the peak temperature from the temperature detected by the thermocouple T along the carrying direction. A discriminating means 18a for discriminating the burn-out position is provided, and the thermocouple T and the discriminating means 18a constitute a burn-out position detecting means D.

The combustion gas generated in the combustion chamber 2 is extracted as heat energy in the form of steam by the exhaust heat boiler 12 so as to be used as the energy of the power generator 13, and is supplied to the outside of the site. Dust and harmful gas are removed by 14 and exhausted. In the combustion chamber 2, a temperature for monitoring the combustion state, such as a furnace outlet temperature detecting means 15 composed of a thermocouple for detecting the temperature of the combustion zone 7, a pressure detecting means (not shown) for detecting the amount of combustion air, etc. A sensor, a gas sensor, etc. are provided. In order to properly adjust and maintain the combustion state of the combustion chamber 2 on the basis of the detection values of these various sensors, the feeding speed of the dust by the pusher 5 and the conveying means S
Combustion control means 18 is provided which is equipped with a microcomputer that adjusts and maintains the proper combustion state by adjusting the dust conveyance speed and the combustion air supply amount. More specifically, the combustion control means 18 includes the furnace outlet temperature detection means 15
The speed of the pusher 5, the conveying speed of the conveying means S, the combustion, Adjust the air supply, etc. For example, if the burnout position is on the upstream side of the rear combustion zone 7B, the transport speed is increased while the furnace outlet temperature is maintained at a predetermined temperature, and the amount of new dust is increased to increase the incineration efficiency, If the burnout position is on the downstream side of the rear combustion zone 7B, the conveying speed is reduced while the furnace outlet temperature is maintained at a predetermined temperature, and the combustion air supply amount is increased so that solid combustion can be sufficiently performed.

Another embodiment will be described below. In the previous embodiment, an example using a thermocouple as the temperature detecting element was shown,
The temperature detecting element is not limited to this, and a thermistor or other element can be used. Further, the installation location and the number of the temperature detection elements are not limited to those in the above embodiment, and can be set appropriately.

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 configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a main part.

FIG. 2 is a perspective view of a main part.

[Fig. 3] Overall configuration of the incinerator

[Explanation of symbols]

 7 Combustion zone 18 Combustion control means 18a Discrimination means D Burnout position detection means G Grate S Transport means T Temperature detection element

Claims (1)

[Claims] 1. A combustion zone (7) provided with a conveying means (S) for conveying the incineration object during combustion by the relative movement of the grate (G) arranged in the front and rear direction, and the combustion zone (7). 7) the burn-off position detecting means (D) for detecting the end position of the gas combustion of the incineration object, and the transfer so that the burn-off position detected by the burn-off position detecting means (D) falls within the set range. A combustion control device for an incinerator, comprising: a combustion control means (18) for increasing or decreasing the conveyance speed of the means (S), wherein the burnout position detection means (D) is the grate ( G)
A plurality of temperature detecting elements (T) arranged along the conveying direction of the incineration object, and a discriminating means (18a) for discriminating the position where the temperature detected by the temperature detecting elements (T) is the highest as the burnout position. Combustion control device for incinerator.