JPS58140514A - Method of controlling incinerator - Google Patents

Abstract

PURPOSE:To protect the furnace wall and carry out smooth air supply by carrying out blow-off of air from the side wall and decreasing the air-blown off quantity from the furnace bed when the combustion exceeds a predetermined temperature, and further increasing the air blow-off quantity from the side wall when the temperature within the furnace exceeds the upper limit. CONSTITUTION:At the time of starting the combustion, only blow-off of air from the furnace bed 1 through a blast pipe 5 is carried out to obtain a stable rise-up in the combustion state. When the side wall 2 rises up from a predetermined temperature, a switching valve 8 is opened by a controller 9, a fan 11 is driven, and air is blown off from the side wall 2, and the side wall 2 is maintained at a temperature less than an optimum temperature. On the other hand, a controller 10 adjusts the opening degree of the switching valve 7, and the air blow- off quantity from the furnace bed 1 to make the total supply air quantity within the furnace (A) optimum. When the temperature within the furnace exceeds the upper limit temperature, the quantity of air from the side wall 2 is increased regardless of the side wall temperature to cool the interior of the furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an incinerator in which the inner wall of the incinerator is made of a cast steel plate, and an air outlet is formed in the side wall to protect the side wall and control the temperature inside the incinerator.

In recent years, incinerators have been devised that employ a secondary combustion air supply system that blows air not only from the hearth but also from the inner wall of the furnace for combustion. The side walls of such furnaces are usually made of cast iron plates, but from the viewpoint of heat resistance etc., it is necessary to maintain the cast iron plates at a temperature lower than the normal combustion temperature in the furnace, so air is blown out from the side walls. The side walls are also cooled.

By the way, if air is blown out from the side wall when the temperature inside the furnace is low, such as at the start of combustion, the amount of air will cause the temperature inside the furnace to drop further, making Goyaki Rikimon unstable. Measures have been taken to measure the temperature and adjust the amount of air blown from the side wall based on the measured value.

However, if the side wall temperature is proportional to the furnace temperature, there is no interstitial layer, but when the side wall temperature does not rise proportionally to the furnace temperature, such as when high-temperature combustion occurs near the side wall, However, since only the amount of air blown out is based on the temperature inside the furnace, there are problems such as the side wall becoming hot and burning out.

The present invention aims to solve the above problems by adding side wall temperature to the control criteria.

This invention provides an incinerator in which the inner wall of the furnace is constructed of a cast steel plate and an air outlet is formed in the side wall to protect the side wall and control the temperature inside the furnace. The air blowing from the side wall is stopped, and then, when the temperature becomes higher than the predetermined temperature, air is blown from the side wall to the optimum temperature of the side wall during combustion, and the hearth is heated by the amount of air blown. In addition, if the temperature inside the furnace exceeds the upper limit, the amount of air blown from the side wall is increased regardless of the amount of air blown from the hearth to lower the temperature inside the furnace. It is something.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, in the furnace A, air can be blown out from the hearth 1 and the furnace inner wall 2. It is a so-called stoker that sends the sardines forward, and this stoker is made of heat-resistant cast steel strip-shaped rosdols, and air is blown out from the gaps between the rosdols.

In addition, the part of the side wall 2 that comes into direct contact with the flame is composed of a plate made of heat-resistant cast steel, and this plate is mounted by hooking the hook on the back side to the foundation, and has an air outlet formed on the end surface. The supplied air cools the side wall 2 and becomes heated secondary combustion air. Note that this air flow serves to force the flame into the center of the furnace.

Furthermore, this furnace A is equipped with an in-furnace temperature sensor 3 and a side wall plate temperature sensor 4. This detector is composed of, for example, a thermocouple or the like, and the detection location is appropriately selected. On the other hand, the blast pipes 5 and 6 to the hearth 1 and the side wall 2 are provided with electromagnetic on-off valves 7 and 8, respectively, and an air flow rate controller 9.
10.

The detection signals from both of the detectors 34 are input to one air flow controller 9, which opens and closes the on-off valve 8 and controls the motor 12 of the plate cooling fan 11. The rotational speed signal of the motor 12 is input to the other air flow controller 10, and based on this signal, the on-off valve 7 is operated so as to reduce the amount of air blown to the hearth by the amount of air blown by the fan 11.
control.

The fan 11 is not provided, and sufficient air is always sent into the blower pipe 6 before the on-off valve 8, and the controller 9 controls the on-off valve 8.
The amount of air blown out may be adjusted by adjusting the degree of opening. In addition, the controller 10 is omitted, and the on-off valve 7 is directly controlled by the controller 9.
You can also adjust the degree of opening.

Note that the amount of air blown from the hearth 1 is appropriately adjusted depending on the amount and properties of the incinerated material, and the temperature inside the furnace is usually maintained at around 900°C.

Next, the effect will be explained.

First, as shown in FIG. 2, at the start of combustion, the on-off valve 8 is closed to stop blowing air from the side wall 2 until the side wall 2 reaches a predetermined temperature, for example, 800°C, and only air is blown from the hearth 1. As a result, a stable combustion state is achieved. When the temperature of the side wall 2 rises above a predetermined temperature, the controller 9 opens the on-off valve 8 and drives the fan 11 to blow out air corresponding to the side wall temperature to maintain the side wall 2 at an optimum temperature, for example, 450° C. or lower. On the other hand, the controller 10 adjusts the degree of opening of the on-off valve 7 in accordance with the amount of air blown from the side wall 2,
By reducing the amount of air blown from the hearth 1 by the amount of air blown from the side wall 2, the total amount of air supplied in the furnace A is always controlled to be the optimum amount for the combustion state, resulting in stable and high efficiency. Combustion takes place.

When the temperature inside the furnace exceeds the upper limit temperature, for example, 950°C, the temperature inside the furnace is increased by increasing the amount of air from the side wall 2 to cool the inside of the furnace. When the temperature inside the furnace falls, the above-mentioned normal air blowing control is performed.

As described above, according to the incinerator control method of the seventh invention, at the start of incineration, the air blowing from the side wall is stopped until the temperature of the side wall reaches a predetermined temperature, and then when the temperature becomes higher than the predetermined temperature, The system blows air from the side wall to reach the optimum temperature of the side wall during combustion, and also reduces the amount of air blown from the hearth by the amount of air blown, and if the temperature inside the furnace exceeds the upper limit, the hearth The temperature inside the furnace is lowered by increasing the amount of air blown from the side wall (related to the amount of air blown from the side wall), so that stable combustion can be achieved even at the start of combustion, and the properties of the incinerated material can be improved. Incineration can be carried out smoothly and with high combustion efficiency even in the face of changes.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the control method of the present invention, and FIG.
The figure is a diagram showing the relationship between the furnace temperature and the like with respect to the passage of time in FIG. 1. A... Furnace, 1... Hearth, 2... Side wall, 3.4...
・Temperature detector, 7.8...Solenoid shut-off valve, 9.10...
・Air flow rate controller, 11...Fan. Patent applicant Kubota Iron Works Co., Ltd.

Claims (1)

[Claims] In an incinerator in which the inner wall of the furnace is constructed of a cast steel plate and an air outlet is formed in the side wall to protect the side wall and control the temperature inside the furnace, the side wall reaches a predetermined temperature at the start of combustion. At home, the air blowing from the side wall is stopped, and then when the temperature rises above the predetermined temperature, air is blown from the side wall to reach the optimum temperature of the side wall during combustion, and the furnace is heated by the amount of air blown. Reduce the amount of air blown from the floor, and if the temperature inside the furnace exceeds the upper limit, reduce the amount of air blown from the hearth (increase the amount of air blown from the side walls to lower the temperature inside the furnace) A method for controlling an incinerator, characterized in that: