JPH02110209A - Method for controlling combustion in incinerator - Google Patents

Abstract

PURPOSE:To make trash combustible with efficiency even when the trash is not readily combustible and prevent damages of grates by fire by controlling the temperature of air for combustion in inverse proportion to the average temperature of the grates so as to maintain the average temperature of the grates within a certain range. CONSTITUTION:When trash 3 is burning, the average temperature Tr deg.C of the grates between two fore-and-aft points A, B in a first combustion zone 7 is measured. When the trash 3 is burning smoothly and the average temperature Tr of the grates is showing an upward tendency, the temperature of air for combustion Ta deg.C is lowered by decreasing the supply of steam 12 so that the combustion of the trash 3 is impede and the increase of the average temperature Tr of the grates is prevented. Contrarily, when the combustion of the trash 3 is not smooth and the average temperature Tr of the grates is showing a downward tendency, the temperature of air for combustion Ta is raised by increasing the supply of steam 12 so that the combustion of the trash 3 is promoted and the decrease of the average temperature Tr of the grates is prevented. Thus the combustion of trash 3 is always stabilized and the average temperature Tr of the grates is maintained within a range of 200 to 400 deg.C. As a result, even such trash 3 as is not readily combustible undergoes efficient combustion and it is not possible for the grates 5 to be damaged by fire.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion control method for a waste incinerator.

Conventional technology Traditionally, when incinerators for municipal waste and other waste are burned on the rostre, preheated combustion air is supplied from below the rostol to improve the combustibility inside the furnace and the economic efficiency of the furnace. It is normal to aim for this. In this case, if the garbage is difficult to burn, it is effective to raise the combustion air temperature, but it is not always easy to detect whether the garbage is combustible or not, so the combustion air is preheated to a certain set value. Often.

Problems to be Solved by the Invention However, according to the above-mentioned conventional combustion method, the combustion temperature in the furnace fluctuates significantly depending on the quality of the waste, resulting in poor combustion in the furnace and burnout of the rostrum. There were other problems.

The present invention is an attempt to solve these conventional problems, and focuses on the fact that the rostre temperature well expresses the quality of dirt being burned in the furnace, and aims to appropriately control the combustion air temperature. With the goal.

Means for Solving the Problems In order to achieve the above object, the combustion control method for a waste incinerator according to the present invention provides a waste incinerator that supplies preheated combustion air from below the rostle when burning waste on the rostle. The combustion air temperature is controlled in inverse proportion to the average roost temperature to maintain the average roost temperature within a certain range.

Effects In the above configuration of the present invention, when the combustibility of the garbage being burned on the roostle is good, the average roostle temperature tends to rise, and conversely, when the combustibility is poor, the average roostle temperature tends to decrease. Therefore, by controlling the combustion air temperature in inverse proportion to the average roostle temperature, the combustion state is stabilized regardless of the quality of the combustibility of the waste, and the average roostle temperature can be maintained within a certain range. As a result, even garbage with poor combustibility can be efficiently combusted, and burnout of the roaster can be prevented.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a garbage incinerator for municipal waste, etc.

This waste incinerator 1 sends waste 3 put into a hopper 2 onto a rooster 5 in the furnace by a pusher 4. The roistle 5 is a multi-stage roistor having a drying zone 6, a first combustion zone 7, a second combustion zone 8 and an after-combustion zone 9. The garbage 3 fed onto the rostol 5 is dried on the drying zone 6,
It is then burned on each combustion zone 7.8.9 and the ash is taken out of the furnace. During the drying and combustion mentioned above, air preheater 1
Combustion air 11 preheated by 0 is supplied from below the roistle 5 to the drying zone 6 and each combustion zone 7, 8.9. The air preheater 10 has a temperature of 180 ℃ supplied from a waste gas boiler (not shown) attached to the waste incinerator 1, for example.
The combustion air 11 is preheated by the steam 12 at ~200°C, and is formed so that the atmospheric air as the combustion air 11 can be preheated to a temperature range of 30 to 100°C by adjusting the flow rate of the steam 12. ing.

By the way, the flammability of the garbage 3 burning on the rostle 5 is not necessarily constant; when the flammability is good, the rostle temperature tends to rise, and when the flammability is poor, the rostle temperature tends to fall. This tendency appears most prominently in the first combustion zone 7 in the case of a multi-stage combustion engine like the Rooster 5. Therefore, in this embodiment, during the combustion of the garbage 3, the average rostre temperature Tr ("C) between the two points A and B before and after in the first combustion zone 7 is measured. is good and the average lost gas temperature Tr is on the rise, the supply of steam 12 is reduced and the combustion air temperature Ta ("
By lowering C), the combustion of the waste 3 is suppressed and the average roost temperature Tr is prevented from rising. By increasing the supply of 12 and raising the combustion air temperature Ta, the combustion of the waste 3 is promoted and the average roost temperature Tr is prevented from falling, thereby constantly stabilizing the combustion state of the waste 3 and increasing the average roost temperature Tr. 200-400
It is maintained within the range of ℃. As a result, even the garbage 3 with poor combustibility can be burned efficiently, and there is no fear that the roaster 5 will be burnt out.

Effects of the Invention As explained above, the present invention focuses on the fact that the rostre temperature well expresses the combustibility of waste, and has a configuration in which the combustion air temperature is controlled in inverse proportion to the average rostre temperature. Regardless of the quality of the combustibility of the waste, the combustion state of the waste is always stabilized, and the average roost temperature is maintained within a certain range. Therefore, it has the advantage that even hard-to-burn garbage can be efficiently combusted, and burnout of the roaster can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a garbage incinerator for explaining one embodiment of the present invention. 1... Garbage incinerator, 3... Garbage, 5... Losttle, 11... Combustion air. Agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. When burning garbage on the rostle, the average rostle temperature is controlled within a certain range by controlling the combustion air temperature in inverse proportion to the average rostle temperature in the waste incinerator that supplies preheated combustion air from below the rostle. A combustion control method for a garbage incinerator characterized by maintaining the combustion within