JPH0141883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sludge supply device for an incinerator provided to incinerate sludge such as dewatered sewage and human waste.

Generally, sludge such as sewage and human waste that has been dehydrated by a dewatering means is incinerated in a fluidized bed incinerator or the like, either alone or mixed with incineration materials such as municipal waste.

As a simple method for supplying this dehydrated sludge into an incinerator, a sludge supply device that supplies the sludge under pressure using a pump has been considered. This sludge supply device mainly consists of the above-mentioned pump and a pressure-feeding pipe that is connected to this pump and supplies sludge into the incinerator. An on-off valve is provided to prevent heat transfer, and a supply port at the tip thereof faces into the incinerator to form a nozzle portion.

In this way, the dehydrated sludge is supplied into the incinerator through the nozzle section and is incinerated either alone or mixed with incineration materials such as municipal waste, and can be incinerated as needed by closing the on-off valve. It is configured so that the supply can be stopped.

However, with the configuration in which the nozzle portion is simply exposed to the inside of the furnace as described above, there is a problem in that failures are likely to occur when restarting the slurry supply after once stopping it. That is, if the on-off valve is closed to stop the sludge supply, sludge will remain in the nozzle.
This remaining sludge is exposed to the high temperature atmosphere in the furnace to promote thermal decomposition, and this thermal decomposition produces tar, chir, etc. Since the nozzle part is overheated, this tar, char, etc. dry, stick, and sinter, narrowing the supply port of the nozzle part and reducing its cross-sectional area. The wear resistance coefficient increases. As a result, the pipe resistance increases significantly, and in order to restart the pump, it becomes necessary to install a pump with a discharge pressure higher than necessary, and in the worst case, it may become impossible to start the pump. .

The present invention has been devised in view of the above problems and to improve them as much as possible.

An object of the present invention is to provide an incineration method that can prevent clogging and sintering of the nozzle tip by introducing combustion air into the nozzle when sludge supply is stopped and actively incinerating the sludge remaining there. The purpose is to provide a slurry supply device to the furnace.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, 1 is an incinerator, and a sludge supply device 2 is provided in the incinerator 1 to supply sludge such as sewage and human waste that has been dehydrated by a dehydrating means (not shown) and incinerate it. ing.

This sludge supply device 2 is provided to continuously and quantitatively supply the sludge transferred from the dewatering means to the incinerator.

The sludge supply device 2 includes a funnel-shaped hopper 3 provided to temporarily store the sludge transferred from the dewatering means and continuously and quantitatively send it out, and a funnel-shaped hopper 3 provided at the bottom of the hopper 3 to send out the sludge from the hopper 3. The sludge pump 4 is mainly composed of a sludge pump 4 that pumps sludge, and a sludge pump 5 that connects the pump 4 and the incinerator 1 to supply the sludge into the incinerator 1.

The tip of the pressure-feeding pipe 5 faces into the incinerator 1, and a nozzle portion 6 is formed therein. Further, an on-off valve 8 is provided in the middle of the pressure-feeding pipe 5 at a position close to the incinerator 1 side for closing the pipe line 7 and stopping the supply of sludge.

Furthermore, this pressure feeding pipe 5 has the above-mentioned on-off valve 8.
An air introduction pipe 10 is connected to the more downstream side 9. This air introduction pipe 10 is connected to a blower 11 or the like in order to actively incinerate the sludge remaining in the nozzle part 6 of the pressure-feeding pipe 5 in the nozzle part 6 by utilizing the high heat in the furnace when the supply of sludge is stopped. An on-off valve 1 is provided to supply combustion air from an air source and operates in synchronization with the opening and closing of the on-off valve 8 of the pressure feed pipe 5.
5 is provided.

Incidentally, an electric motor 12 for driving the pressure pump 4 is connected to the pressure pump 4. Further, the air source may be opened to the atmosphere without using the blower 11 or the like.

Next, the operation of the present invention configured as described above will be described.

Sludge such as sewage and human waste that has been dewatered by the dewatering means is fed into the hopper 3 and temporarily stored there. The stored sludge is continuously and quantitatively sent to the pressure pump 4, and is forced through the sludge pressure feed pipe 5 and supplied into the incinerator 1 to be incinerated.

In addition, when stopping the mud supply, the pressure feeding pipe 5
At the same time, the on-off valve 15 of the air introduction pipe 10 is opened and the operation of the pressure pump 4 is stopped. Combustion air is fed into the nozzle portion 6 from an air source such as a blower 11 through an air introduction pipe 10.

Therefore, by utilizing the high heat inside the incinerator 1 by this combustion air, the sludge 14 adhering to the inner circumferential wall 13 of the nozzle part 6 can be actively burned and incinerated here as shown in FIG. This prevents the sludge remaining at the tip of the nozzle portion 6 from clogging. Therefore, most of the sludge 14 adhering to the nozzle part 6 is ashed and shrunk, and most of it falls off, and tar, chir, etc. generated by thermal decomposition are sintered and the sludge 14 attached to the nozzle part 6 is ashed and shrunk, and most of it falls off.
It is possible to prevent the cross-sectional area from being reduced.

Therefore, even when sludge is supplied into the incinerator 1 again, it is possible to prevent obstacles such as an increase in pipe resistance that adversely affect the restart of the pressure pump 4, and reduce the required discharge pressure of the pump 4. can be done.

Further, as shown in FIG. 3, an air introduction pipe 10 is formed by providing a tapered through hole 17 from the outside to the inside in the pipe wall 16 of the nozzle part 6 facing into the incinerator 1. However, the object of the present invention can be sufficiently achieved even if an additional configuration is added to supply the high-temperature in-furnace atmosphere that convects in the incinerator 1 as combustion air into the nozzle section 6.

As is clear from the above description, the present invention provides the following excellent effects.

1. When the sludge supply is stopped, the sludge remaining in the nozzle is actively incinerated and ashed and shrunk, thereby preventing clogging and sintering of the tip of the nozzle.

2. Since clogging and sintering of the nozzle tip can be prevented, pipe resistance does not increase, and problems that occur when restarting the pressure pump can be prevented.

3. The required discharge pressure of the pressure pump can be reduced because no more load than necessary is applied when restarting the pressure pump.

4. It has a simple structure and can be provided at a low price, and
It is highly useful as it is easy to implement.

[Brief explanation of drawings]

Fig. 1 is a schematic side sectional view showing the configuration of a preferred embodiment of the present invention, Fig. 2 is a partial sectional view showing the nozzle section of Fig. 1, and Fig. 3 is a modified embodiment of the air introduction pipe and nozzle section. FIG. In the figure, 1 is an incinerator, 2 is a slurry supply device, 5 is a pressure pipe, 6 is a nozzle part, 8 is an on-off valve, 9 is a downstream side, 1
0 is an air introduction pipe.

Claims (1)

[Claims] 1. In a sludge supply device installed to supply sludge such as sewage and human waste that has been dehydrated by a dewatering means into an incinerator for incineration treatment, the sludge transferred from the dewatering means is continuously and quantitatively treated as described above. A sludge pressure-feeding pipe provided to supply the incinerator and having a nozzle portion facing into the incinerator, an on-off valve provided on the forced-feeding pipe to stop the supply of sludge, and a sludge provided on the downstream side of the on-off valve. 1. A sludge supply device for an incinerator, comprising: an air introduction pipe for introducing combustion air in order to combust the sludge remaining in the nozzle part using the heat inside the incinerator when the supply of sludge is stopped.