JPH0519045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a combustion and melting control device for an ash melting furnace for melting incinerated ash of municipal waste and the like.

[Prior Art] An ash melting furnace that heats and melts incinerated ash is conventionally known as a device for melting incinerated ash of municipal waste (garbage discharged from cities) to form slag. .

However, in this type of ash melting furnace, the running cost of the ash melting furnace increases due to the use of oil or electricity as a source for melting the incinerated ash, making it uneconomical.

Therefore, in recent years, a passage has been formed in the furnace body below the incinerator outlet to transport the incinerated ash dropped from the outlet to the downstream, and a passage is opened upstream of the incinerator to transport the incinerated ash. The residual carbon in the incinerated ash (relative to the weight of the incinerated ash) is
An air supply means is provided to mix 10 to 15%) with air to produce a combustion exothermic reaction, and this reaction burns residual carbon and releases the reaction heat (heat of incineration).
An ash melting furnace has been developed that uses this as heat for melting incinerated ash.

[Problems to be Solved by the Invention] However, when the incinerated ash in the melting furnace becomes high in temperature due to the combustion exothermic reaction and exceeds the melting temperature, the open end of the air supply means is blocked by the molten metal. or occur. Blocking the open end thus makes it impossible to re-incinerate the incinerated ash. On the other hand, if the temperature is too low, the molten metal will solidify and solidify, causing blockage in the furnace and rendering it inoperable, which is a problem that needs to be solved.

[Means for Solving the Problems] The present invention aims to solve the above problems by exciting a combustion exothermic reaction in the residual carbon in the incinerated ash thrown into the ash melting furnace from the main combustion furnace, In an incineration and melting control device for an ash melting furnace, which is provided with an air supply means having an opening for supplying air to the incinerated ash in the upstream part of the ash melting furnace, in order to melt the incinerated ash using the combustion generated heat as a melting heat source. A pusher for transporting the incinerated ash downstream is removably provided in the upstream part of the ash melting furnace, and a temperature detection means for continuously detecting the atmospheric temperature or the molten exhaust gas temperature in the upstream or downstream part is provided, and the temperature A controller is provided that operates the pusher to transfer the incinerated ash to the downstream side when the initial melting temperature of the incinerated ash is detected by the detection means for a predetermined period of time.

[Function] The incinerated ash dropped from the main incinerator causes residual carbon in the incinerated ash to undergo a combustion exothermic reaction by air from the air supply means opened in the upstream section. This melts the incineration ash. On the other hand, the temperature detection means continuously detects the atmospheric temperature in the upstream or downstream part of the ash melting furnace, and inputs the detected temperature to the controller. When the initial melting temperature of the incinerated ash is detected by the temperature detection means for a predetermined period of time, the controller operates the pusher to transfer the incinerated ash to the downstream side, thereby transferring the incinerated ash in the upstream part to the downstream part. As a result, stable melting operation can be performed without clogging the open end of the air supply means with the molten metal and without clogging the furnace due to solidification of the molten metal upon cooling.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a system diagram of an ash melting furnace.

A downwardly inclined passage 7 is connected to the furnace body 1 below the discharge port 6, and the tip of this passage 7 is further bent in the direction of gravity and connected to a slag generation chamber (not shown). The furnace body 1 below the main fuel chamber 5 is provided with a door 8 that can be opened and closed to partition the main fuel chamber 5 side and the passage 7 side, and in this embodiment, the door 8 is oriented horizontally. It is configured so that it can be opened and closed by sliding it.

On the other hand, in the passage 7, an opening/closing door 8 is provided at the upstream part 7a.
A pusher 9 is provided to move a certain amount of incinerated ash dropped from the main combustion chamber when the main combustion chamber is opened from the upstream section 7a to the downstream section 7b. In the embodiment, the pusher 9 is a hydraulic or pneumatic fluid cylinder, and its tip 9a is inclined diagonally downward to facilitate the transfer of the incinerated ash. Hearth 7c of passage 7
Inside, heaters 10 for heating the hearth 7c and the inside of the passage 7 are sequentially arranged along the passage direction, and the heater 10 in the upstream part 7a heats up to about 800°C, and the heater 10 in the downstream part 7b heats up to about 1300°C. heated. That is, the upstream part 7a
The temperature of the heater 10 is adjusted to the incineration temperature of the incinerated material, and the temperature of the downstream section 7b is adjusted to the melting temperature of the incinerated material. In addition, the upstream portion 7a of the passage 7 has a
Air supply means 11 which is opened in the passage 7 of a and blows air into the passage 7 is disposed, and a plurality of air supply means 11 are provided at sequential intervals in the passage direction. A heating means 12 such as a flame burner is disposed in the downstream portion 7b, facing the hearth 7c of the downstream portion 7b.

On the other hand, in the furnace body 1 below the opening/closing door 8 and above the hearth 7c of the upstream section 7a, a temperature detection means 13 for continuously measuring the atmospheric temperature in the upstream section is disposed. The means 13 are connected to a controller 14 . For example, as shown in FIG. 2, the controller 14 operates when the detected temperature, that is, the combustion gas temperature (atmosphere temperature in the upstream section) reaches the initial melting temperature of the incinerated ash for a predetermined period of time (for example, from 950°C to
1100℃), output to the pusher 9 and send it to the upstream section 7.
It is configured to transport the incinerated ash of a to the downstream part 7b. Specifically, the controller 14 includes a CPU,
PID etc. are adopted.

Next, the action will be explained.

The incinerated ash dropped into the upstream section 7a of the passage 7 is heated in this upstream section 7a, and air is supplied from the air supply means 11 to cause a combustion exothermic reaction, whereby residual carbon in the incinerated ash is incinerated. At the same time, the combustion heat generated at this time promotes the melting of the incinerated ash after combustion in the downstream section 7b. When the fuel gas heat in the upstream section 7a measured by the temperature detection means 13 reaches the initial melting temperature of the incinerated ash for a predetermined period of time, the controller 1
4 operates the pusher 9 to transfer the incinerated ash from the upstream section 7a to the downstream section 7b. The transferred incineration ash is melted in the downstream section 7b. Here, the incineration ash melted downstream falls and solidifies in the slag generation chamber.
That is, a pollution-free and reduced volume slag can be obtained.

[Effects of the Invention] As is clear from the above explanation, the present invention exhibits the following excellent effects.

(1) This prevents clogging of the opening of the fluid supply means that opens into the passage and blows out air, and prevents the passage from being blocked due to the generation of fixed slag (clinker), and prevents the combustion of incinerated ash in the upstream part of the passage and the downstream part of the passage. The incineration ash is reliably melted, greatly improving reliability.

(2) Furnace running costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a preferred embodiment of the present invention, and FIG. 2 is a diagram showing an example of a control pattern. In the figure, 1 is a furnace body, 4 is a door, 5 is a main combustion chamber, 6 is an exhaust port, 7 is a passage, 8 is an opening/closing door, 9 is a pusher, 10 is a heater, 11 is an air supply means, and 12 is a heating means , 13 is a temperature detection means, and 14 is a controller.

Claims (1)

[Claims] 1 Excite a combustion exothermic reaction in the residual carbon in the incinerated ash thrown into the ash melting furnace from the main combustion furnace, and incinerate it in the upstream part of the ash melting furnace in order to melt the incinerated ash using the generated heat of combustion as a melting heat source. In the incineration and melting control device for an ash melting furnace, which is provided with an air supply means having an opening for supplying air to the ash, a pusher for transferring the incinerated ash to the downstream is provided in the upstream part of the ash melting furnace so that it can appear and disappear at will. At the same time, a temperature detection means for continuously detecting the atmospheric temperature or molten exhaust gas temperature at the upstream or downstream part is provided, and when the initial melting temperature of the incinerated ash is detected by the detection means for a predetermined period of time, the incinerated ash is An apparatus for controlling incineration and melting of an ash melting furnace, characterized in that a controller is provided to operate the pusher to transfer the ash to the downstream side.