KR101314825B1 - Deodorization boiler and sludge treating apparatus including the same - Google Patents

Abstract

Present a deodorizing boiler. Deodorizing boiler according to one embodiment, the water cooling wall having an inlet for introducing the odor gas and the outlet for discharging the burned gas, the insulating member provided on the outside of the water cooling wall, is installed near the inlet It includes a burner for burning odor gas, and a fireproof member which is installed inside the water cooling wall and surrounds the burner and includes refractory.

Description

Deodorizing boiler and sludge treatment apparatus including same {DEODORIZATION BOILER AND SLUDGE TREATING APPARATUS INCLUDING THE SAME}

The present invention relates to a deodorizing boiler and a sludge treatment apparatus including the same.

In general, sludge-type high water wastes containing large amounts of water are generated during sewage and wastewater treatment. These wastes are the main contaminants of water and soil, and their effective management is very important.

Such sludge type wastes are typically dried and recycled using a sludge dryer. In such a sludge dryer, odorous gas is generated while the sludge is dried, and in order to remove the odor component, a odor gas generated in the sludge dryer is burned using a burner.

However, when the burner stops unexpectedly for reasons such as a power failure, the temperature of the odor gas combustion chamber drops sharply, and thus the odor gas is often discharged to the outside without being burned.

One embodiment of the present invention is to reduce the outflow of odor gas by smoothing the slope of the temperature change that occurs when the burner suddenly stops operating.

According to an aspect of the present invention, a water cooling wall having an inlet for introducing an odor gas and an outlet for discharging combusted gas, a heat insulating member installed outside the water cooling wall, and installed in the inlet And a deodorizing boiler including a burner for burning the malodorous gas inside the water cooling wall, and a fireproof member disposed inside the water cooling wall and surrounding the burner.

The refractory may include aluminum oxide (Al ₂ O ₃ ) and silicon dioxide (SiO 2).

Specific gravity of the refractory is 2,000 ~ 2,200 kg / m ³ , specific heat is 0.25 ~ 0.35, heat transfer rate may be 9 ~ 11 kcal / hm ² ℃.

The boiler further includes a partition partitioning an internal space defined by the water cooling wall into a combustion chamber including the burner inside and a heat exchange chamber located outside the burner, wherein the fireproof member may be located inside the combustion chamber.

The boiler may further include a plurality of heat transfer tubes located in the heat exchange chamber and contacting the gas combusted in the combustion chamber to evaporate water.

The boiler is connected to a first drum connected to a first end of the heat transfer pipe, a first pipe connected between the first drum and the outside and flowing with water introduced from the outside, and connected to a second end of the heat transfer pipe. The water vapor generated in the second drum is collected, and may be further connected between the second drum and the outside and a second pipe for discharging the water vapor of the second drum to the outside.

The first pipe may be descending while traveling toward the first drum.

The heat exchange chamber may include a heat transfer tube group in which the heat transfer tubes are collected, and a flow path positioned between the heat transfer tube group and the partition.

The boiler may further include a temperature sensor for sensing the temperature of the internal space defined by the water cooling wall.

The minimum deodorizing temperature of the combustion chamber may be 800 ° C. and the normal operating temperature may be 1,000 ° C.

The water cooling wall may include a plurality of heat transfer tubes, and a blocking membrane connected between adjacent heat transfer tubes to separate the internal space from the outside.

The sludge treatment apparatus according to an embodiment of the present invention, a sludge dryer for drying the sludge at the same time to generate a malodor gas containing malodorous components contained in the sludge by heating the sludge, and the odor discharged from the sludge dryer It includes a deodorizing boiler for burning gas, the deodorizing boiler is the same as one described above.

The sludge treatment apparatus may include a centrifugal dust collector which removes dust of odor gas discharged from the sludge dryer by centrifugal force, a washing tower that sprays and removes dust of odor gas discharged from the sludge dryer, in the deodorization boiler. It may further include a filter dust collector for filtering the discharged combustion gas to remove dust and harmful components, and a chimney for discharging the gas discharged from the filter dust collector to the atmosphere.

When the boiler burns the malodorous gas, water is boiled into steam to supply the sludge dryer, and the sludge dryer may be heated by indirectly contacting the steam with the sludge.

According to one embodiment of the present invention, when the burner stops abruptly, the temperature is gradually lowered, so that time for taking necessary measures can be obtained, thereby suppressing the emission of odor gas.

1 is a vertical cross-sectional view of a deodorizing boiler according to an embodiment of the present invention.
Figure 2 is a horizontal cross-sectional view of the deodorizing boiler according to an embodiment of the present invention.
3 is a vertical sectional view of the insulating member in the deodorizing boiler according to the present embodiment.
4 is a horizontal cross-sectional view of the insulating member in the deodorizing boiler according to the present embodiment.
5 is an enlarged cross-sectional view of the water cooling wall according to the present embodiment.
6 is a graph showing the temperature change in the combustion chamber as a function of time after the burner is shut down in an experimental example of the present invention.
7 is a process chart of the sludge treatment apparatus according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: FIG. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 to 5 will be described in detail with respect to the deodorizing boiler according to an embodiment of the present invention.

1 and 2 are vertical and horizontal cross-sectional views of the deodorizing boiler according to an embodiment of the present invention, respectively, and FIGS. 3 and 4 are vertical and horizontal cross-sectional views of the insulating member in the deodorizing boiler according to the present embodiment, respectively. 5 is an enlarged cross-sectional view of the water cooling wall according to the present embodiment.

Boiler according to an embodiment of the present invention by removing the odor gas discharged from the sludge dryer (not shown), and at the same time to boil and steam the water with heat generated during combustion and use it as a heat source. Hereinafter, for convenience of description, six directions of up, down, left, and right are set based on the drawing shown in FIG. 1.

1 and 2, the boiler according to the present embodiment is surrounded by a lid 10 made of tin, etc., and the water cooling defines an inner space 20 in which the odor gas is burned and cooled. The wall 42 is provided, and between the cover 10 and the water cooling wall 42, a heat insulating member 30 for keeping the internal heat is provided.

Referring to FIG. 3, when viewed from the front, the inner surface 31 of the insulating member 30, that is, the boundary surface of the inner space 20 is approximately trapezoidal and protrudes outwardly in a circular arc near both right corners. Looking at the outer surface of the insulating member 30, the upper surface 32 is almost horizontally different from the contour of the inner surface 31 going from left to right, and protrudes upward in an arc shape along the contour of the inner surface 31. Unlike the upper surface 32, the lower surface 33 is an inclined surface gradually descending from left to right along the contour of the inner surface 31, and then protrudes downward in an arc shape. The left side 34 and the right side 35 of the outer surface of the insulating member 30 stand in a substantially vertical direction and are substantially parallel to each other. Referring to FIG. 4, the front surface 36 and the rear surface 37 of the outer surface of the insulating member 30 are substantially parallel to each other and are substantially perpendicular to the left surface 34 and the right surface 35. The front and rear surfaces of the inner surface 31 of the insulating member 30 also have almost the same shape as the outer surface.

The cover 10 has a shape substantially the same as the outer surface of the insulating member 30, and the water cooling wall 42 has a shape similar to the inner surface of the insulating member 30.

Referring to FIG. 5, the water cooling wall 42 includes a membrane 49 connected between the plurality of heat pipes 48 extending in the vertical direction and the adjacent heat pipes 48. The heat pipe 48 is a coolant flow to cool the heat of the gas flowing in the inner space 20, the blocking film 49 blocks the space between the heat pipe 48 so as not to leak out to the gas.

Referring back to FIGS. 1 and 2, the inner space 20 is divided into a combustion chamber 22 and a heat exchange chamber 24 by plate partitions 44 arranged perpendicular to the central portion of the inner space 20.

At this time, referring to Figure 1, the partition 44 is formed so that the upper end is in contact with the upper side of the inner space 20 and the lower end is in contact with the lower side of the inner space (20).

And, referring to Figure 2, the rear end of the partition 44 is formed to contact the rear surface of the inner space 20, the front end is extended to the front side in the inner space 20 but spaced apart from the front surface by a predetermined interval It is formed to be.

As a result, the combustion chamber 22 and the heat exchange chamber 24 partitioned in the internal space communicate with each other at the front side of the partition 44.

On the other hand, the partition 44, like the water cooling wall 42 includes a heat transfer pipe and a blocking film therebetween.

The combustion chamber 22 may be in the form of a trapezoidal column rotated approximately 90 degrees, and extends long in the front-rear direction. At the rear of the combustion chamber 22, an inlet 38 through which an odor gas is introduced by an external blower (not shown) is formed, and at least one burner for burning the introduced odor gas together with the fuel gas. (60) is installed. Here, combustion gas and oxygen for igniting burner 60 may be further supplied through inlet 38. In addition, it will be apparent to those skilled in the art in view of the technical spirit of the present invention that the burner 60 may be installed near the inlet 38 or the inlet 38 of the water cooling wall 38.

In order to sufficiently burn and decompose the malodorous gas, the inside of the combustion chamber 22 must be maintained at a temperature higher than or equal to the deodorizing temperature. For example, the minimum temperature of the deodorizing temperature is about 800 ° C. Temperature) can be, for example, about 1,000 ° C. When the temperature of the combustion chamber 22 falls below 800 ° C., the decomposition rate of the malodorous gas may drop, and thus, the function of deodorization may not be performed properly.

Referring to FIG. 1, the combustion chamber 22 is mostly surrounded by the fire resistant member 50 on the rear surface, the upper surface, the lower surface, and the left and right sides on which the burner 60 is attached, but the front surface does not have the fire resistant member 50. Referring to FIG. 2, the fire resistant members 50 on the top, bottom, left, and right sides of the combustion chamber 22 extend forward from the rear side to about half of the entire length of the boiler. However, the length of the fire resistant member 50 may be different from this.

The refractory member 50 must withstand the high temperature inside the combustion chamber 22, so that it may be made of, for example, a refractory that can withstand the normal operating temperature. The refractory may include, for example, aluminum oxide (Al ₂ O ₃ ) and silicon dioxide (SiO 2) and may be castable. The specific gravity of the refractory can be for example 2,000 to 2,200 kg / m ³ , in particular about 2,100 kg / m ³ , and the specific heat can be for example 0.25 to 0.35 and especially about 0.3. The annual transfer rate of the refractory may for example be 9-11 kcal / hm ² ° C (h is time), in particular 10 kcal / hm ² ° C. The volume and surface area of the fire resistant member 50 may be determined such that the time from the burner 60 unintentionally shut down to reach the lowest deodorizable temperature is the time required for taking the necessary measures, for example, 10 minutes or more. This is described in detail later.

The thickness of the fire resistant member 50 may be about 1/2 of the thickness of the insulating member 30.

A discharge port 39 through which the burned gas is discharged is formed near the right front end of the heat exchange chamber 24.

Semi-cylindrical grooves are formed in the lower and upper heat insulating members 30 of the heat exchange chamber 24, and the lower drum 71 and the upper drum 72 are provided in the grooves. The lower drum 71 starts from the left side of the insulating member 30, extends to the right along the lower outer surface of the insulating member 30, and is connected to the lower pipe 73 passing through the insulating member 30. 72 is buried in the upper part of the heat insulating member 30, and is connected with the upper piping 74 extended to the left and right. The upper pipe 74 may be substantially parallel to the bottom, and the lower pipe 73 may follow a path descending toward the lower drum 71 along the inclination of the lower outer surface of the insulating member 30.

The lower drum 71 and the upper drum 72 are connected to each other by a plurality of heat transfer tubes 75 and 76 having very small diameters, and a heat transfer tube connecting the lower pipe 73 and the upper pipe 74 (not shown). May be added. Since the lower drum 71 and the upper drum 72 are biased to the right side of the heat exchange chamber 24, the heat transfer tubes 75 and 76 may be concentrated on the right side of the heat exchange chamber 24 to form the heat transfer tube cluster 26. As a result, a slight flow path 28 may be formed between the partition 44 and the heat pipe assembly 26. The heat transfer tubes 75 and 76 do not exist in the vicinity of the heat insulating member 30 at the rear thereof, and a blocking film 77 is provided between the heat transfer tubes 76 in contact with the flow path 28 to form a partition 46. Thus, instead of the gas coming forward from the combustion chamber 22 across the partition 44 directly exiting the outlet 39, it moves backward along the flow path 28 defined by the two partitions 44 and 46, In contact with the heat transfer tubes (75, 76) is directed toward the outlet 39 in front.

The lower drum 71 is filled with water introduced through the lower pipe 73, and the water comes into contact with the hot gas in the inner space 20 in the heat transfer tubes 75 and 76 to become water vapor to become the upper drum 72. After gathering to the outside through the upper pipe 74 may be used as a heat source for other devices such as heating. Since the lower pipe 73 goes down toward the lower drum 71, water introduced into the lower pipe 73 may naturally flow toward the lower drum 71 by gravity.

On the other hand, the boiler according to the present embodiment further includes a plurality of temperature sensor 80 for measuring the temperature of the internal space (20). Referring to FIG. 2, for example, three temperature sensors 80 may be disposed, one each above the fireproof member 50 of the left side of the insulating member 30 and near the flow path 28 of the rear portion and the front portion of the insulating member 30. Can be installed.

Next, an experimental example of the present invention will be described in detail with reference to FIG. 6.

6 is a graph showing the temperature change in the combustion chamber as a function of time after the burner is shut down in an experimental example of the present invention.

The specific gravity, specific heat, and heat transfer rate of the refractory member 50 in this experimental example are 2100 kg / m ³ , 0.3, and 10 kcal / hm ² ° C., respectively, and the normal operating temperature is 1,000 ° C., the lowest deodorizable temperature is 800 ° C., and always During operation, the surface temperature of the fireproof member 50 was 80 ° C., and the gas discharged to the outlet 39 was designed at 5,278 kg / h per hour, and the volume of the fireproof member 50 was 2.135 m ³ and the surface area was 30.5 m ² . decided.

The amount of heat of the refractory member 50 from the normal operating temperature to the minimum deodorizing temperature is equal to the weight (= volume × specific gravity) × specific heat × (always operating temperature-the minimum temperature for deodorization), and the normal temperature at the surface temperature during normal operation. The amount of heat of dissipation emitted by the fireproof member 50 up to is equal to the surface area x heat transfer rate x (surface temperature at normal operation-room temperature). Therefore, the time it takes for the temperature in the combustion chamber 22 to reach the minimum deodorizable temperature from the normal operating temperature is theoretically used to raise the air at room temperature by the amount of (free heat calorie-dissipated heat) / (discharge gas) to the minimum deodorizable temperature. Calories required).

If the room temperature is 20 ℃ and the above values are calculated and calculated, the amount of heat is 269,010 kcal, dissipation heat is 18,300 kcal, 5,278 kg / h, the heat required to raise the temperature of 20 ℃ gas to 800 ℃ is 1,029,210 kcal / h. Therefore, the time taken for the temperature of the combustion chamber 22 to reach the minimum temperature which can be deodorized from the normal operation temperature is theoretically about 14.62 minutes, and exceeds 10 minutes.

However, as a result of actual experiments, the temperature from the normal operating temperature (1,000 ° C.) to the minimum deodorizing temperature (800 ° C.) was about 28 minutes, almost twice the theoretical value as shown in FIG. 6.

On the other hand, in the absence of the fireproof member 50, the amount of heat dissipated by the thermal insulation member 30 is calculated from the surface temperature to room temperature during normal operation, and the temperature of the air at room temperature as much as the exhaust gas is raised to the lowest deodorizing temperature. It can be divided by the amount of heat required, and assuming that the surface area and heat transfer rate of the insulating member 30 are the same as that of the refractory member 50, the time from the normal operating temperature to the lowest deodorizing temperature is theoretically about 1.07 minutes. It was remarkably short compared with the case with the member 50.

As described above, according to the present embodiment, when the burner 60 suddenly stops operating, the temperature is gradually lowered down to the lowest possible deodorizing temperature, so that necessary measures can be taken during the time to suppress the emission of the malodorous gas. .

Then, the sludge treatment apparatus including the deodorizing boiler will be described in detail with reference to FIG. 7.

7 is a process chart of the sludge treatment apparatus according to an embodiment of the present invention.

The dewatered sludge stored in the dewatered sludge storage tank 100 is heated and dried in the sludge dryer 200, stored in the storage silo 300, loaded on the vehicle 310, moved to another place, and then landfilled, burned, or recycled. In the process of moving the dry sludge from the storage silo 300 to the vehicle 310, scattering dust is generated, and a carrier gas containing the scattering dust is introduced into the sludge dryer 200 and reprocessed together with the sludge. .

In the sludge dryer 200, the sludge is heated, and the moisture contained therein is converted into steam containing odor components. At this time, the scattering dust introduced into the sludge dryer 200 from the storage silo 300 may be mostly removed while being heated together with the sludge. However, some of the scattering dust may not be removed, and dust may be newly generated in the sludge dryer 200. These vapors and dust are discharged from the sludge dryer 200 in the carrier gas. Dust carried in the carrier gas is removed from the centrifugal dust collector 410 and the cleaning tower 400. The centrifugal dust collector 410 collects and removes dust using a centrifugal force, and the washing tower 400 sprays water on the gas to remove dust from the gas. Eventually, the gas discharged from the cleaning tower 400 is introduced into the boiler 500 by the blower 510, and this gas corresponds to the odor gas described above. Malodorous gases include vapors and carrier gases comprising malodorous components.

The malodorous gas is burned together with the fuel gas in the boiler 500 as shown in FIGS. 1 to 4, where the malodorous components contained in the malodorous gas are decomposed and removed. Combustion gas combusted in the boiler 500 enters the air preheater 550 and is used to heat the air introduced from the atmosphere, and the air warmed in the air preheater 550 enters the boiler 500 in the scrubber tower 400. It is burned together with the exhausted gas. The combustion gas passing through the air preheater 550 flows into the filter dust collector 600, which filters the combustion gas to remove solid and dust components and harmful components included in the combustion gas. The gas discharged from the filter dust collector 600 is introduced into the chimney 800 by the auxiliary blower 810 and discharged to the atmosphere.

On the other hand, the boiler 500 heats the water supplied from the feed water pump 530 to make water vapor, and then supplies it to the sludge dryer 200, the sludge dryer 200 is heated indirectly in contact with the sludge. . The water vapor exiting the sludge dryer 200 is cooled and stored in the condensate tank 520 and supplied to the boiler 500 again by the feed pump 530.

As described above, the deodorizing boiler according to the present embodiment may be applied to the sludge treatment apparatus to provide steam used in the sludge dryer 200 and to remove odor gas from the sludge dryer 200.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

10: Cover
20: interior space
22: combustion chamber
24: heat exchange chamber
26: tube assembly
28: Euro
30: wall
31: Inside of the wall
32: Top of wall exterior
33: the outer surface of the wall
34: Left side of wall exterior
35: right side of wall exterior
36: Front of the wall exterior
37: Rear of wall exterior
38: inlet
39: outlet
42: water cooling wall
44, 46: partition
48, 75, 76: heat pipe
49, 77: barrier
50: fireproof member
60: burner
71: lower drum
72: upper drum
73: bottom piping
74: upper pipe
100: dewatered sludge reservoir
200: sludge dryer
300: storage silo
310: vehicle
320: discharge fan
400: washing tower
410: centrifugal dust collector
500: boiler
510 blower
520: condensate tank
530: feed pump
550: air preheater
600: filtration dust collector
800: chimney
810: auxiliary blower

Claims (13)

A water cooling wall defining an internal space and having an inlet for introducing malodorous gas and an outlet for discharging burned gas,
A thermal insulation member provided outside the water cooling wall;
A burner installed at the inlet and combusting the malodorous gas inside the water cooling wall, and
A fireproof member disposed inside the water cooling wall and surrounding the burner,
Further comprising a partition that divides the internal space defined by the water cooling wall into a combustion chamber and a heat exchange chamber,
The burner and the fireproof member are located inside the combustion chamber,
The refractory member includes aluminum oxide (Al ₂ O ₃ ) and silicon dioxide (SiO 2),
Specific gravity of the refractory member is 2,000 ~ 2,200 kg / m ³ , specific heat is 0.25 ~ 0.35, heat transfer rate is 9 ~ 11 kcal / hm ² ℃ deodorizing boiler. delete delete delete In claim 1,
Located in the heat exchange chamber and the deodorizing boiler further comprises a plurality of heat pipes in which water is evaporated in contact with the gas burned in the combustion chamber. The method of claim 5,
An upper drum connected to one end of the heat transfer pipe,
An upper pipe connected between the upper drum and the outside and flowing water from the outside;
A lower drum connected to the other end of the heat pipe and collecting water vapor generated from the heat pipe;
A lower pipe connected between the lower drum and the outside and discharging water vapor of the lower drum to the outside;
Deodorizing boiler further comprising. The method of claim 6,
The heat exchange chamber,
A heat pipe assembly in which the heat pipes are gathered, and
A flow path located between the heat pipe assembly and the partition
Containing
Deodorizing boiler. The method of claim 6,
Deodorizing boiler further comprising a temperature sensor for sensing the temperature of the interior space defined by the water cooling wall. In claim 1,
Deodorizing boiler of the combustion chamber is the minimum temperature of 800 ℃ and the normal operating temperature of 1,000 ℃. In claim 1,
The water cooling wall,
A plurality of heat pipes, and
Blocking membrane connected between adjacent heat pipes to separate the internal space from the outside
Containing
Deodorizing boiler. A sludge dryer for heating the sludge to produce a malodorous gas containing malodorous components contained in the sludge and drying the sludge at the same time, and
The deodorizing boiler according to claim 1, which burns the malodorous gas discharged from the sludge dryer.
Sludge treatment apparatus comprising a. 12. The method of claim 11,
A centrifugal dust collector for removing dust of the malodorous gas discharged from the sludge dryer by using a centrifugal force,
Washing tower to remove the dust of the odor gas discharged from the sludge dryer by spraying water,
Filter dust collector to remove the dust and harmful components by filtering the combustion gas discharged from the deodorizing boiler, And
Chimney for discharging the gas discharged from the filter dust collector to the atmosphere
Sludge treatment apparatus further comprising. The method of claim 12,
The boiler boils water when burning the malodorous gas into water vapor and supplies it to the sludge dryer,
The sludge dryer heats the steam by indirect contact with the sludge.
Sludge treatment unit.

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