JP2963638B2 - Fluidized bed sludge incinerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized bed type sludge incinerator used for incinerating a large amount of dewatered cake of sludge generated from sewage, night soil and other wastewater treatment facilities.

[0002]

2. Description of the Related Art Generally, sludge generated from wastewater treatment equipment is dewatered in advance to form a dewatered cake, and then incinerated in a fluidized bed sludge incinerator or the like. The sludge that has become such a dewatered cake is put into a fluidized bed sludge incinerator,
It has been carried out by a rotary sludge diffusion and injection device using a centrifugal force called a spreader (Japanese Patent Laid-Open No. 2-122108), a screw feeder, or a pipe directly connected to a furnace. However, while the spreader with a screw feeder and the screw feeder alone can easily control the amount of sludge input, there is a problem in that the layout is restricted due to the large size and the complete sealing of the odor of the sludge is structurally difficult.

The sludge supply pipe system using a pipe directly connected to the furnace has a disadvantage that it is compact and has a high degree of freedom in layout, and it is easy to completely seal off the odor of sludge, but it is difficult to control the amount of sludge introduced. In particular, conventional furnace-directed piping often has a plurality of sludge supply ports connected to one sludge supply device, but the control of the input amount at each sludge supply port is not possible even if the input amount of the entire furnace can be controlled. Was. As a result, the sludge input amount varies between the center of the hearth and the periphery of the hearth, and the combustion state of each part is biased, resulting in lack of uniformity and stability, and excessive air and fuel consumption required for incineration. A trend was seen. In addition, partial over-exposure generates temporary reducing combustible gas and requires measures to prevent deflagration in equipment after the furnace. In addition, unburned components burn on the freeboard, and the freeboard becomes hot, causing problems such as damage to the furnace wall and the waste gas treatment facility. These trends became more pronounced as the incinerator hearth area increased.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional sludge supply pipe system, makes the combustion state of the entire hearth uniform, reduces fuel consumption and suppresses the generation of reducible combustible gas. The purpose of the present invention is to provide a fluidized bed type sludge incinerator that can improve the safety of the entire plant and can also suppress the increase in the temperature of the freeboard due to the combustion of unburned components.

[0005]

SUMMARY OF THE INVENTION A fluidized bed type sludge incinerator according to the present invention, which has been made to solve the above-mentioned problems, is controlled in accordance with a signal from combustion temperature detecting means on an upper part of a furnace body. A plurality of sludge supply ports each having a sludge supply amount control means are provided.

[0006]

In the fluidized bed type sludge incinerator of the present invention, the combustion temperature in the furnace is monitored by the combustion temperature detecting means, and the sludge supply amount from a plurality of sludge supply ports provided in the upper part of the furnace body accordingly. Can be individually controlled. As a result, it is possible to eliminate the local rise in temperature of the fluidized bed and the local combustion failure, to make the combustion state of the entire hearth uniform, and to generate the reducing combustible gas and the unburned portion. There is an advantage that the high temperature of the free board can be suppressed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 denotes a furnace body of a fluidized bed sludge incinerator, 2 denotes a fluidized bed thereof, 3 denotes a plurality of fluidized dispersion pipes for fluidizing the fluidized bed 2, and 4 denotes a fluidized dispersion pipe. Source of flowing air. Reference numeral 18 denotes an oil gun, and 19 denotes a pump for supplying fuel to the oil gun 18 and a high-pressure air source.

A combustion temperature detecting means 5 is provided on the side of the furnace body 1.
Is installed to monitor the combustion state in the furnace. It is preferable that the combustion temperature detecting means 5 be installed at three or more locations on the freeboard, inside the hearth, and the lower part of the hearth in the height direction, and at two or more locations symmetrically in the radial direction. Due to the increase in the number of measurement points and the temperature measurement in the center of the hearth,
A long temperature sensor can be selected as the combustion temperature detecting means 5. Furthermore, if a radiation type temperature camera is used in order to know the temperature distribution of the entire fluidized-bed 2, it is possible to more accurately detect variations in the combustion state in the furnace.

[0009] In addition to the exhaust gas outlet 6, a plurality of sludge supply ports 7 are provided in the upper part (top part) of the furnace body 1. The plurality of sludge supply ports 7 are symmetrically dispersed in the horizontal direction as shown in FIG. Further, as shown in FIG. 3, the plurality of sludge supply ports 7 are arranged obliquely or perpendicular to the horizontal plane. This angle is determined by the sludge supply amount and the furnace height, but is preferably set to 45 degrees or less.

It is preferable that the sludge supply port 7 has a plurality of slits 8 as shown in FIG.
Sludge is dispersed and supplied into the furnace by the slits 8. The number and size of the slits 8 are determined in accordance with the amount of sludge supplied, but it is preferable to make the slits 8 as fine as not to increase the sludge supply pressure loss. It is preferable that the inner surface of the sludge supply port 7 is smooth and has a low resistance.

As shown in FIG. 1, each sludge supply port 7 is provided with a sludge supply amount control means. The sludge supply amount control means comprises a shutoff valve 9, a sludge amount detection means 10 and a flow rate regulating valve 11, and each sludge supply port 7 is connected to a sludge supply pipe 12 through the sludge supply amount control means. Have been. Shut-off valve 9
Is for shutting off the supply of sludge to each sludge supply port 7. The sludge amount detecting means 10 is for detecting the amount of sludge passing through each sludge supply port 7, and here an electromagnetic flow meter is used. The flow control valve 11 is a throttle valve having a function of continuously adjusting the amount of sludge. For example, a flow control valve having a structure in which an elastic sleeve 14 is inserted into a body 13 as shown in FIG. it can. The flow rate adjusting valve 11 having this structure can control the flow rate without applying a pressurized fluid between the body 13 and the elastic body sleeve 14 to deform the elastic body sleeve 14 and clog sludge. The throttle of the valve is adjusted by the amount of deformation of the elastic sleeve caused by the pressure of the pressurized fluid.

The sludge supply pipe 12 has two or more sludge supply ports 7.
And a header structure for averaging the amount of sludge supplied to each sludge supply port 7. One end of the sludge supply pipe 12 is connected to a sludge supply device 16 via a sludge supply cutoff valve 15. The sludge is stored in a hopper 17 and supplied to a sludge supply pipe 12 by a sludge supply device 16 such as a screw pump.

In the fluidized bed type sludge incinerator of the present invention thus constructed, the sludge is supplied to the sludge supply pipe 12 by the sludge supply device 16 and further supplied from the respective sludge supply ports 7 into the furnace. At this time, the combustion temperature detecting means 5 monitors the combustion temperature distribution in the furnace, and the sludge supply amount from each sludge supply port 7 is controlled by the sludge supply amount control means accordingly. Therefore, according to the present invention, the combustion state of the entire hearth can be made uniform, and stable combustion can be performed, so that the air amount and the fuel consumption can be kept sufficiently and sufficiently. In addition, since the generation of unburned components and reducing combustible gas can be suppressed, the freeboard can be prevented from becoming hot due to the burning of unburned components in the freeboard, preventing damage to the freeboard and exhaust gas treatment equipment. can do.

[0014]

As described above, the fluidized-bed type sludge incinerator of the present invention can make the combustion state of the entire hearth uniform, reduce fuel consumption, generate reducible combustible gas and generate unburned fuel. It has the advantage that the temperature of the freeboard can be suppressed even by the combustion of minute fuel, and is particularly suitable for application to a fluidized bed sludge incinerator with a large hearth area.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fluidized bed type sludge incinerator according to an embodiment.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an enlarged sectional view of a furnace top.

FIG. 4 is an enlarged view of a sludge supply port, (A) is a longitudinal sectional view,
(B) is the YY arrow view.

FIG. 5 is a longitudinal sectional view of a flow control valve.

[Explanation of symbols]

1 Furnace body, 2 Fluidized hearth, 3 Fluid dispersion pipe, 4
Flowing air source, 5 combustion temperature detecting means, 6 exhaust gas outlet,
7 Sludge supply port, 8 slit, 9 shut-off valve, 10 means for detecting sludge amount, 11 flow control valve, 12 sludge supply pipe, 13
Body, 14 elastic sleeve, 15 sludge supply shutoff valve, 16
Sludge feeder, 17 hopper, 18 oil gun, 19 fuel pump and high pressure air source

Claims (7)

(57) [Claims] 1. A fluidized bed provided with a plurality of sludge supply ports each provided with a sludge supply amount control means, which is controlled in accordance with a signal from a combustion temperature detection means, in an upper part of a furnace main body. Type sludge incinerator. 2. The fluidized bed sludge incinerator according to claim 1, wherein the sludge supply port has a slit for finely dispersing the sludge. 3. The fluidized bed sludge incinerator according to claim 1, wherein the sludge supply port is provided obliquely or vertically at a symmetric position of the furnace main body. 4. The fluidized bed sludge incinerator according to claim 1, wherein the sludge supply port has an inner surface which is smooth and has low resistance. 5. The fluidized bed type sludge incinerator according to claim 1, wherein the sludge supply amount control means includes means for detecting the amount of sludge passing through each sludge supply port. 6. The fluidized bed type sludge incinerator according to claim 1, wherein the sludge supply amount control means includes a flow control valve capable of continuously adjusting the amount of sludge and a shutoff valve capable of shutting off sludge. 7. The fluidized bed sludge incinerator according to claim 1, further comprising a header for averaging the amount of sludge supplied to each sludge supply port.