KR19980019273A - ENERGY SAVING-TYPE INCINERATION SYSTEM FOR FLUIDIZED BED SLUDGE - Google Patents

Abstract

In the present invention, after drying the sludge with high moisture, it is incinerated using a fluidized bed incinerator, and waste heat generated during incineration is recovered and recycled in a dryer. It is about. In the energy-saving fluidized bed sludge incineration system of the present invention, a sludge dryer 22 for drying the dewatered sludge 12 discharged through the belt press 2 and a sludge from the sludge dryer 22 are sprayed (28). A fluidized-bed incinerator 30 which is incinerated by moving inwardly by using; An indentation blower 52 is connected to one side thereof, connected to the fluidized bed incinerator 30, and connected to an air preheater 50 and an air preheater 50 to supply a predetermined amount of air to the fluidized bed incinerator 30. And a reactor 79 and a back filter connected to a waste heat recovery boiler 70 and a waste heat recovery boiler 70 configured to send steam from the inside to the sludge dryer 22, and using a neutralizer 74 of powder. 80 and the stack 90 which connects the inlet blower 84 to the back filter 80, and is connected. The energy-saving fluidized bed sludge incineration system configured as described above is easier to incinerate because wet sludge is first dried and then incinerated using a sludge drier, and it is discharged after completely removing dust and air pollution from the components of the gas burned. There is an advantage to protect.

Description

Energy Saving Fluidized Bed Sludge Incineration System

The present invention relates to an energy-saving fluidized bed sludge incineration system, and in particular, after drying the sludge, it is incinerated using a fluidized bed incinerator and waste heat generated during incineration is recovered and recycled in a dryer, and hazardous gases can be treated using a reactor and a back filter. Energy-saving fluidized bed sludge incineration systems.

Conventionally, the fluidized bed sludge incineration system uses a direct incineration method, and incinerates sludge having a high moisture content by injecting auxiliary fuel. In the conventional fluidized bed sludge incineration system as shown in FIG. 1, the dewatered sludge 12 is directly injected into the incinerator 10 to be incinerated. In addition, the gas discharged from the incinerator 10 passes through the air preheater 5. In addition, a press-fit blower 2 is installed at one side of the air preheater 5.

The air preheater 5 is connected to the forced cooler 3, and the forced cooler 3 is connected to the cyclone 6. The cyclone (6) is sequentially connected to the electrostatic precipitator (7) and the venturi scrubber (15), the gas passing through the venturi scrubber (15) by the inlet blower (8a) to the outside (9) It is discharged through.

However, since the conventional fluidized bed sludge incineration system configured as described above is incinerated directly without drying the dehydrated high water content sludge, it consumes a lot of auxiliary fuel and excessively consumes the operating cost, and occurs when incinerated due to high moisture content. As the amount of gas is increased, the investment cost is increased by increasing the capacity of the facility, and the number of processes increases due to a separate treatment step.

In addition, the configuration of the incinerator is a combustion method in which the burner directly heats the fluid, resulting in a nonuniform temperature in the fluidized bed so that the sludge cannot be completely incinerated. In addition, wastes having good general incineration can be incinerated to some extent, but wastes containing a large amount of moisture cannot be incinerated by themselves, which causes disadvantages in that auxiliary fuel is introduced.

Accordingly, an object of the present invention is to provide an energy-saving fluidized bed sludge incineration system which can dry the wet sludge first and then incinerate with a sludge dryer, and also remove the dust and air pollution from the components of the gas burned. Is in point.

Another object of the present invention is to provide an energy-saving incineration system that indirectly completely incinerates sludge and receives energy required from a sludge dryer from a waste heat recovery boiler to save energy.

Energy-saving fluidized bed sludge incineration system of the present invention for achieving the above object, the sludge dryer to dry the dewatered sludge discharged through the belt press, and the sludge from the sludge dryer by moving the inside to the incinerator to burn incineration It is connected to the fluidized bed incinerator, a pressurized blower is connected to one side, the air preheater is connected to the fluidized bed incinerator to supply a predetermined amount of air to the fluidized bed incinerator, connected to the air preheater, the steam from the inside A waste heat recovery boiler configured to send the sludge dryer to the waste heat recovery boiler, a reactor and a back filter connected to the waste heat recovery boiler and using a neutralizer of powder; It is composed of a stack formed so that the gas from the back filter can be discharged to the outside by a manned blower.

1 is a perspective view showing a conventional incineration system.

Figure 2 is an overall process diagram of the energy-saving fluidized bed sludge incineration system according to an embodiment of the present invention.

3 is a view showing a sludge dryer which is a main part of the present invention.

4 is a sectional view of a fluidized-bed incinerator, which is a main part of the present invention.

5A is a view showing a connection relationship between a pipe and a nozzle of the induction incinerator of FIG. 4.

FIG. 5B is a sectional view taken along the line A-A of FIG. 5A; FIG.

* Explanation of symbols on the main parts of the drawings

12: sludge 22: sludge dryer

24: steam supply line 26: sludge supply pump

30: incinerator 42: condenser

44: exhaust fan 50: air preheater

52: press-fit blower 70: waste heat recovery boiler

74: neutralizer 80: back filter

90: stack

Hereinafter, an energy-saving fluidized bed sludge incineration system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a process flow diagram of an energy saving fluidized bed sludge incineration system according to an embodiment of the present invention. The energy-saving fluidized bed sludge incineration system uses a sludge dryer 22 for drying the dewatered sludge 12 from the belt press 2 and a sludge spray 28 from the sludge dryer 22. The fluidized-bed incinerator 30 is moved to the inside and incinerated, and a press-fit blower 52 is connected to one side thereof, and the fluidized-bed incinerator 30 is connected to the fluidized-bed incinerator 30 to supply a predetermined amount of air. An air preheater 50 to be supplied to the air heater; A waste heat recovery boiler 70 connected to the air preheater 50 and configured to send steam from the inside to the sludge dryer 22, and a waste neutralizer 74 of the powder. The reactor 79 and the back filter 80 using the, and the stack 90 is formed to discharge the gas from the back filter 80 to the outside by the inlet blower (84).

As shown in FIG. 3, the sludge dryer 22 of the present invention transfers the wet sludge by the operation of the sludge supply pump 26 to flow into the inlet 19 of the sludge dryer 22. A plurality of shafts 23 are installed inside the sludge dryer 22, and paddles 24a are provided at predetermined intervals on the shaft 23. In addition, the shaft 23 has a hollow shape, and the shaft 23 is provided with steam from the steam supply line 24. The shaft 23 is provided with a plurality of pulleys 41 spaced from each other, the pulleys 41 are interconnected by a belt 43, they are connected to the drive source 40. Here, the drive source 40 is to use a commonly used motor.

In addition, a sludge supply pump 26 is installed at one side of the sludge dryer 22 at predetermined intervals, and the wet sludge is moved by the operation of the sludge supply pump 26 to move the inlet port of the sludge dryer 22. 19).

The other side of the sludge dryer 22 is connected to the condenser 42 at predetermined intervals, the discharge fan 44 in the upper predetermined portion of the condenser 42 to discharge the heat from the condenser 42 to the outside ) Is installed.

On the other hand, the dried sludge discharged from the sludge drier 22 is moved to the fluidized bed incinerator 30 to be incinerated.

As shown in FIG. 4, the fluidized-bed incinerator 30 has a sludge inlet 31 formed at one side thereof, and the sludge introduced therein is disposed at a position for easy incineration by injecting sludge into a predetermined direction. Spreaders 28 are provided.

The fluidized-bed incinerator 30 is a sludge inlet 31 for sludge injecting on one side thereof, as shown in FIGS. 4, 5A, and 5B, and is installed on the other side of the sludge to be introduced and stored therein. Burner 34 for incineration, and is installed on one side of the upper portion, a combustion gas discharge portion 39 for discharging combustion gas, and is installed on one side of the lower portion, the non-combustible discharge portion 38 for discharging the incombustibles And a plurality of pipes 32 installed therein, and nozzles 33 provided at predetermined intervals on the outer circumference of the pipe 32. The pipe 32 is connected to the air manifold 35 via a coupling 37.

The nozzle 33 is made of a special steel having heat resistance and abrasion resistance so as to prevent maintenance from occurring later. In addition, the pipe 32 is made of stainless steel having high reliability against thermal expansion. When stainless steel is heated for a long time in the temperature range of 540 to 940 ° C, brittleness is formed by forming σ phase, and SUS304 is formed at 594 ° C, SUS316 is 758 ° C, and SUS310 is formed at 815 ° C. Strongly designed

On the other hand, the combustion gas from the combustion gas discharge portion 39 of the fluidized bed incinerator 30 flows into the air preheater 50, and the air preheated in the air preheater 50 flows into the fluidized bed incinerator 30. Will be. The air preheater 50 is connected to a press blower 52 for press-fitting air at predetermined intervals.

In addition, the air preheater 50 is connected to the waste heat recovery boiler 70, the steam generated in the waste heat recovery boiler 70 is provided to the sludge dryer 22. In addition, the harmful gas from the waste heat recovery boiler 70 is absorbed by the neutralization material 74 of the powder, the waste heat recovery boiler 70 is connected to the back filter 80 at a predetermined interval. The neutralizing material 74 is treated by absorbing gases such as SOx, HCL, HF, and dioxins.

The purified gas from the back filter 80 is discharged to the outside through the stack 90 by the inlet blower 84.

Referring to the operation relationship of the energy-saving fluidized bed sludge incineration system of the present invention configured as described above are as follows.

First, some of the sludge dewatered is transferred in a pipe (not shown) by the operation of the sludge supply pump 26 to be introduced into the inlet port 19 of the sludge dryer 22. Since the sludge is moved into the pipe, it is possible to prevent the smell from leaking to the outside.

The sludge introduced into the sludge dryer 22 is dried by steam coming out through the paddles 24a of the plurality of shafts 23 formed in the sludge dryer 22. At this time, the shaft 23 is rotated by the rotation of the pulley 41 connected to the belt 43 by the operation of the drive source 40.

In addition, the condenser 42 installed on the other side of the sludge dryer 22 discharges heat generated therein to the outside, and the discharged heat is discharged to the outside by driving the discharge fan 44.

The sludge dried from the sludge dryer 22 is introduced into the fluidized bed incinerator 30. The sludge introduced into the sludge inlet 31 of the fluidized bed incinerator 30 is distributed by the spreader 28 into the combustion chamber. Since the spreader 28 is used, the sludge can be evenly distributed, and the occurrence of local unburning of the sludge can be prevented. In addition, the spreader 28 has an advantage that the installation space can be smaller than the conventional screw conveyor.

A plurality of nozzles 33 are provided in the plurality of pipes 32 installed below the fluidized bed incinerator 30, and air is distributed through the nozzles 33. The nozzle 33 is formed as shown in FIG. 5B so that the fluidized bed of sludge is formed well.

On the other hand, the sludge incombustibles are discharged to the lower center of the fluidized bed incinerator 30, and combustion gas is discharged to the upper center through the combustion gas discharge unit 39. The discharged combustion gas is introduced into the air preheater 50, and the air preheated in the air preheater 50 is returned to the fluidized bed incinerator 30 again. Then, air is introduced into the air preheater 50 by the press-fit blower 52.

Since the waste heat recovery boiler 70 of the present invention can send steam to the sludge dryer 22 without inputting auxiliary fuel, it is possible to recycle predetermined steam to save waste of fuel.

On the other hand, the harmful gas from the waste heat recovery boiler 70 is absorbed and processed through the reactor 79 by the neutralizing material (74). Here, SOx, HCL, HF, dioxin and the like are treated. In particular, dioxins are treated at 0.1 ng / Nm ² or less. In addition, the treatment efficiency is about 80 to 95%, and by-products FLT ASH (fly ash) is discharged, which does not require a separate treatment facility. In addition, the gas filtered by the neutralizing material 74 passes through the back filter 80 again and is discharged to the outside via the flue 90 by the inlet blower 84 again.

As such, the energy-saving fluidized bed sludge incineration system of the present invention has the advantage of simplifying the whole process, saving investment costs, reducing auxiliary fuel costs, and simplifying maintenance and repair. The energy-saving fluidized bed sludge incineration system of the present invention may be implemented with many modifications without being limited to the above embodiments without departing from the spirit and scope of the present invention, but it will be appreciated that this will fall within the scope of the present invention.

The energy-saving fluidized bed sludge incineration system of the present invention configured as described above is easy to incinerate because wet sludge is first dried and then incinerated using a sludge drier, and also completely removes dust and air pollution from the components of the gas burned. There is an advantage to protect the environment because of the emission. In addition, since the sludge is dried and incinerated, a separate device for the treatment of the sludge is not required, so that the entire configuration can be simplified and the steam of the waste heat recovery boiler can be recycled, thereby saving energy. There is an advantage.

Claims (6)

A sludge dryer for drying the dewatered sludge from the belt press, a fluidized bed incinerator for incineration by moving the sludge from the sludge dryer to the inside using a spreader, and a press-in blower connected to one side thereof, An air preheater connected to the fluidized bed incinerator for supplying a predetermined amount of air to the fluidized bed incinerator, a waste heat recovery boiler connected to the air preheater and configured to send steam from the inside to the sludge dryer, and the waste heat recovery An energy-saving fluidized bed sludge incineration system, comprising: a reactor connected to a boiler, a back filter using a neutralizing agent of powder, and a stack to discharge gas from the back filter to the outside by a manned blower. 2. The sludge dryer of claim 1, wherein the sludge dryer includes at least one shaft provided with steam therein, a plurality of paddles provided at predetermined intervals on the shaft, a driving source for rotating the shaft, and Energy-saving fluidized bed sludge, comprising a plurality of pulleys installed at predetermined intervals, a belt connected between the pulleys, and an inlet and an outlet for inflow and outflow of predetermined sludge, respectively, on upper and lower portions thereof. Incineration system. The energy-saving fluidized bed sludge incineration system according to claim 2, wherein the sludge dryer is provided with a sludge supply pump for supplying wet sludge at a predetermined interval on one side thereof. According to claim 2, The sludge dryer is characterized in that the condenser for condensing the water supplied to the predetermined portion at a predetermined interval and the discharge fan for discharging the heat discharged from the condenser to the outside, characterized in that Energy-saving fluidized bed sludge incineration system. According to claim 1, wherein the fluidized bed incinerator is a sludge inlet for sludge input to one side, a burner for incineration of sludge that is installed on the other side, is introduced into and stored therein, and installed on the upper side And a combustion gas discharge part for discharging the combustion gas, a lower portion of the combustion gas discharge part, a non-flammable discharge part for discharging the non-combustibles, a plurality of pipes installed therein, and a predetermined interval at an outer circumference of the pipe. Energy-saving fluidized bed sludge incineration system, characterized in that it comprises a nozzle that is installed. The energy-saving fluidized bed sludge incineration system according to claim 5, wherein the sludge inlet is provided with a sprayer for moving the sludge in a predetermined direction.