JPH08318300A - Sludge drying apparatus - Google Patents

Abstract

PURPOSE: To reduce the quantity of dried sludge issued by sludge treatment and to accelerate the reutilization of dried sludge by deodorizing drying exhaust gas while reducing the energy consumption of the whole of a sludge drying apparatus to a large extent and reducing the water content of dried sludge. CONSTITUTION: Drying exhaust gas 7 is taken out of an centrifugal membrane dryer 8 and air taken in from the outside is heated by the heat of the drying exhaust gas 7 in a heat exchanger 13 and the heated air is supplied to a conveyor 11 to remove moisture from the dried sludge 6 on the conveyor 11 to discharge the same to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge drying device for producing sludge by drying sludge water generated in a sewage treatment plant or the like.

[0002]

2. Description of the Related Art Indirect heating type sludge drying devices and centrifugal thin film drying type sludge drying devices have been known as sludge drying devices of this type.

The indirect heating type sludge drying device is a device for drying sludge water by using steam to make dried sludge, and is widely used in small-scale sewage treatment plants because of its simple structure. .

The sludge dryer of the centrifugal thin film drying system is shown in FIG.
As shown in FIG. 5, the sludge water 10 supplied with the separation cylinder 103 which is heated by the steam 101 supplied from the boiler equipment and is rotationally driven by the motor 102 is supplied.
A centrifugal thin film dryer 107 for separating 4 into a dry sludge 105 and a dry exhaust gas 106; and a trap 109 for temporarily storing a steam drain 108 discharged from the centrifugal thin film dryer 107 and then returning it to a boiler facility or the like, The conveyor 110 that receives the dried sludge 105 discharged from the lower part of the centrifugal thin film dryer 107 and carries it out to the outside, and the dry exhaust gas 106 discharged from the upper part of the centrifugal thin film dryer 107 are taken in and supplied cooling water 111. The scrubber 113 that cools the dry exhaust gas 106 to discharge the cooled dry exhaust gas 106 and discharges the waste water 112 generated by the cooling operation, and the scrubber 113 from the scrubber 113.
6, a blower 114 for sucking out 6, a heater 115 for heating the dry exhaust gas 106 sucked by the blower 114 to a predetermined temperature, a heat exchanger 116, and a catalytic reactor 117.
And a catalytic combustor 118 that deodorizes the dry exhaust gas heated by the heater 115 and guides it to the outside.

In the centrifugal thin film drying type sludge drying apparatus, the motor 102 of the centrifugal thin film dryer 107 is used.
While the separation cylinder 103 is rotated by, the separation cylinder 103 is heated by the steam 101 supplied from the boiler equipment. The steam used for heating is returned to the boiler equipment via the trap 109, while the sludge water 104 to be treated is separated into the dried sludge 105 and the dried exhaust gas 106, and the dried sludge 105 thus obtained is conveyed by the conveyor 110. It is carried out to the outside.

In parallel with this operation, the blower 114
The negative pressure obtained by driving the centrifugal thin film dryer 1
The dry exhaust gas 106 is taken out from the scrubber 113.
And is heated by the heater 115 while being cooled to remove excess water and impurities. The heated dry exhaust gas 106 is decomposed and deodorized in the catalytic reactor 117 of the catalytic combustor 118, and then discharged to the outside.

As described above, the centrifugal thin film drying type sludge drying device 100 shown in FIG. 4 converts the sludge water 104 into the dried sludge 105 with higher heat transfer efficiency than the above-mentioned indirect heating type sludge drying device. It has been widely used in recent years.

[0008]

However, the above-mentioned indirect heating type sludge drying device and centrifugal thin film drying type sludge drying device 100 have the following problems.

That is, in the indirect heating type sludge drying device, as is apparent from the basic principle, there is a problem that a large-scale sludge treatment cannot be performed because the heat transfer efficiency cannot be increased.

A centrifugal thin film drying type sludge drying apparatus 1
As is clear from the basic structure of No. 00, the heat transfer efficiency can be increased, and thus large-scale sludge treatment can be performed, but on the other hand, in order to decompose the dry exhaust gas 106 by the catalytic combustor 118, the heater 115 is used. Since it is necessary to raise the temperature of the dry exhaust gas 106 by using, there is a problem that power consumption increases.

Further, in such a centrifugal thin film drying type sludge drying apparatus 100, since the water content of the dried sludge 105 obtained by the sludge treatment is high, the dried sludge 1 produced by the sludge treatment 1
Not only is it difficult to reduce the amount of 05, but it is also difficult to reuse the dried sludge 105.

The present invention has been made in view of the above circumstances, and an object thereof is to deodorize dry exhaust gas while significantly reducing the energy consumption of the entire apparatus, and to further reduce the water content of dry sludge. Can be reduced to reduce the amount of dry sludge discharged from sludge treatment.
An object of the present invention is to provide a sludge drying device that can promote reuse of dried sludge.

[0013]

In order to achieve the above object, the sludge drying device according to the present invention is, in claim 1, heating sludge water to be treated by a heat fluid supplied from the outside, A centrifugal thin film dryer that dehydrates by a centrifugal thin film system, a heat exchanger that heats drying air with a dry exhaust gas discharged from this centrifugal thin film dryer or a heat fluid discharged from the centrifugal thin film dryer, and this heat exchange A re-dryer for further drying the dried sludge discharged from the centrifugal thin film dryer by the drying air heated by a dryer, and a dry exhaust gas discharged from the centrifugal thin film dryer provided in the latter stage of the heat exchanger. A moisture / impurity remover that cools and removes excess moisture and water-soluble impurities, and a heater that heats the dry exhaust gas discharged from this moisture / impurity remover,
The catalyst combustor decomposes the dry exhaust gas heated by the heater to deodorize by the action of the catalyst.

Further, in claim 2, a sludge water to be treated is heated by a hot fluid supplied from the outside and is dehydrated by a centrifugal thin film system, and the sludge water is discharged from the centrifugal thin film dryer. A water / impurity remover that cools dry exhaust gas to remove excess water and water-soluble impurities
A heat exchanger for heating the dry exhaust gas discharged from the moisture / impurity remover by the dry exhaust gas discharged from the centrifugal thin film dryer or the heat fluid discharged from the centrifugal thin film dryer, and discharged from this heat exchanger A heater for heating the dried exhaust gas and a catalytic combustor for decomposing and deodorizing the dry exhaust gas heated by the heater by the action of the catalyst are provided.

[0015]

In the above construction, in the sludge drying device of claim 1, while heating the sludge water to be treated with the hot fluid supplied from the outside by the centrifugal thin film drier, the sludge water is dehydrated by the centrifugal thin film system and The drying air is heated by the dry exhaust gas discharged from the centrifugal thin film dryer by the exchanger or the thermal fluid discharged from the centrifugal thin film dryer, and the drying air heated by the heat exchanger by the re-dryer is changed. Use it to further dry the dry sludge discharged from the centrifugal thin film dryer, and cool excess water and water-soluble impurities by cooling the dry exhaust gas discharged from the centrifugal thin film dryer with a moisture / impurity remover. After that, the heater heats the dry exhaust gas discharged from the moisture / impurity remover, and the catalytic effect of the catalytic combustor heats the dry exhaust gas heated by the heater. By deodorization by decomposing the vinegar,
The water content of the dried sludge is reduced to reduce the amount of dried sludge produced during sludge treatment and promote reuse of the dried sludge.

Further, in the sludge drying device according to the second aspect, the sludge water to be treated is heated by a centrifugal thin film dryer to heat the sludge water to be treated and dehydrated by the centrifugal thin film method to remove water and impurities. The exhaust gas discharged from the centrifugal thin film dryer by a heat exchanger to remove excess water and water-soluble impurities, and the exhaust gas discharged from the centrifugal thin film dryer by a heat exchanger or the centrifugal thin film dryer. After heating the dry exhaust gas discharged from the water / impurity remover with the hot fluid discharged from the heater, the heater heats the dry exhaust gas discharged from the heat exchanger, and the heater is heated by the catalytic action of the catalytic combustor. By decomposing and deodorizing the dry exhaust gas heated by
Greatly reduces the power consumption of the heater,
While significantly reducing the energy consumption of the entire device,
Deodorize dry exhaust gas.

[0017]

【Example】

<< Description of First Embodiment >> FIG. 1 is a configuration diagram showing a first embodiment of a sludge drying device according to the present invention.

The sludge drying apparatus 1 shown in this figure is provided with a separation cylinder 4 which is heated by steam (for example, a steam pressure of 0.78 MPa) 2 supplied from a boiler facility and is rotationally driven by a motor 3. Sludge water 5
A centrifugal thin film dryer 8 for separating the sludge into a dry sludge 6 and a dry exhaust gas 7, a trap 10 for temporarily accumulating a steam drain 9 discharged from the centrifugal thin film dryer 8 and then returning it to a boiler facility, and a centrifuge. A conveyor 11 that receives the dried sludge 6 discharged from the lower part of the thin film dryer 8 and carries it out to the outside.
And the dry exhaust gas (this dry exhaust gas is usually at a temperature of 90 ° C. to 100 ° C.) 7 discharged from the upper part of the centrifugal thin film dryer 8, and the dry exhaust gas 7
The air taken in from the outside via the filter 12 is heated by the filter 12 and supplied to the conveyer 11.
The heat exchanger 13 for further drying the dried sludge 6 carried by 1 and the dry exhaust gas 7 discharged from the heat exchanger 13 are taken in, and the supplied cooling water 14 cools the dry exhaust gas 7 to remove excess heat. A scrubber 16 that removes water, impurities, and the like and discharges the cooled dry exhaust gas 7, and also discharges the waste water 15 generated by the cooling operation, and a blower 17 that sucks the dry exhaust gas 7 from the scrubber 16.
It has a heater 18 for heating the dry exhaust gas 7 sucked by the blower 17 to a predetermined temperature, a heat exchanger 19 and a catalytic reactor 20, and deodorizes the dry exhaust gas 7 heated by the heater 18 to the outside. And a catalytic combustor 21 for guiding.

In this sludge drying device 1,
First, while rotating the separation cylinder 4 by the motor 3 of the centrifugal thin film dryer 8, the separation cylinder 4 is heated by the steam 2 supplied from the boiler equipment. The steam drain 9 generated by this is returned to the boiler equipment via the trap 10, while the sludge water 5 to be treated is separated into the dry sludge 6 and the dry exhaust gas 7.

In parallel with this operation, the dry exhaust gas 7 is taken out from the centrifugal thin film dryer 8 by the negative pressure obtained by driving the blower 17. In the heat exchanger 13, the heat of the dry exhaust gas 7 heats the air taken in from the outside. The heated air is supplied to the conveyor 11.
Then, by supplying this heated air, moisture is removed from the dried sludge 6 discharged from the centrifugal thin film dryer 8 and placed on the conveyor 11, and then the dried sludge is carried out to the outside.

Further, in parallel with this operation, the blower 17
Dry exhaust gas 7 extracted from centrifugal thin film dryer 8 by
Is cooled by the scrubber 16 to remove excess water and impurities, and is heated by the heater 18 to be decomposed and deodorized in the catalytic reactor 20 of the catalytic combustor 21 and then discharged to the outside.

As described above, in the first embodiment, the dry exhaust gas 7 is taken out from the centrifugal thin film dryer 8 and the heat exchanger 1
The air taken in from the outside is heated by the heat of the dry exhaust gas 7 by 3 and the heated air is supplied to the conveyer 11, and the moisture is removed from the dry sludge 6 on the conveyer 11 to the outside. I am doing so
The water content of the dried sludge 6 can be reduced to reduce the amount of the dried sludge 6 discharged in the sludge treatment, and the reuse of the dried sludge 6 can be promoted, for example, processing such as brick or feed. .

<< Explanation of Second Embodiment >> FIG. 2 is a block diagram showing a second embodiment of the sludge drying apparatus according to the present invention. In addition,
In this figure, the same parts as those in FIG. 1 are designated by the same reference numerals.

The sludge drying apparatus 1a shown in the figure is provided with a separation cylinder 4 which is heated by steam (for example, a steam pressure of 0.78 MPa) 2 supplied from a boiler equipment and is rotationally driven by a motor 3. A centrifugal thin film dryer 8 for separating the sludge water 5 thus separated into a dry sludge 6 and a dry exhaust gas 7, and a steam drain 9 discharged from the centrifugal thin film dryer 8 are temporarily stored and then returned to a boiler facility or the like. A trap 10 and a conveyor 11 for receiving the dried sludge 6 discharged from the lower part of the centrifugal thin film dryer 8 and carrying it out to the outside.
And the dry exhaust gas 7 discharged from the upper part of the centrifugal thin film dryer 8 is taken in, and the dry exhaust gas 7 is cooled by the supplied cooling water 14 to remove excess water, impurities, etc. And a blower 17 that sucks the dry exhaust gas 7 from the scrubber 16 that discharges the wastewater 15 generated by the cooling operation.
And the heat exchanger 25 that heats the dry exhaust gas 7 sucked by the blower 17 to raise the temperature of the dry exhaust gas 7 by the heat of the steam drain 9 returned from the trap 10 to the boiler facility, and the heat exchanger 25. A catalyst combustor having a heater 18 for heating the dry exhaust gas 7 heated to a predetermined temperature, a heat exchanger 19 and a catalyst reactor 20, and deodorizing the dry exhaust gas 7 heated by the heater 18 to guide it to the outside. 21 and 21.

In the sludge drying device 1a, first, the separation cylinder 4 is heated by the steam 2 supplied from the boiler equipment while the separation cylinder 4 is rotated by the motor 3 of the centrifugal thin film dryer 8. The steam drain 9 generated by this is supplied to the heat exchanger 25 via the trap 10 and then returned to the boiler equipment, while the sludge water 5 to be treated is separated into the dry sludge 6 and the dry exhaust gas 7. .
The dried sludge 6 thus obtained is carried out by the conveyor 11.

In parallel with this operation, the negative pressure obtained by driving the blower 17 extracts the dry exhaust gas 7 from the centrifugal thin film dryer 8 and cools it by the scrubber 16 to remove excess water and impurities. After being removed, it is heated by the heat exchanger 25. The dried exhaust gas 7 after heating is further heated by the heater 18, decomposed and deodorized by the catalytic reactor 20 of the catalytic combustor 21, and then discharged to the outside.

As described above, in this second embodiment, the vapor drain 9 of the vapor 2 used for heating the centrifugal thin film dryer 8 is supplied to the heat exchanger 25, and the heat exchange action by the heat exchanger 25 is carried out. After that, the dry exhaust gas 7 discharged from the centrifugal thin film dryer 8 and having excess water and impurities removed by the scrubber 16 is heated, and the heated dry exhaust gas 7 is further heated by the heater 18 to reach a predetermined temperature. Since the catalyst combustor 21 of the catalytic combustor 21 decomposes and deodorizes it and discharges it outside, the heater 18
It is possible to deodorize the dry exhaust gas 7 while significantly reducing the power consumption of the electric power used in the above and significantly reducing the energy consumption of the entire apparatus.

<< Explanation of Third Embodiment >> FIG. 3 is a block diagram showing a third embodiment of the sludge drying apparatus according to the present invention. In addition,
In this figure, the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals.

The sludge dryer 1b shown in this figure differs from the sludge dryer 1 shown in FIG. 1 in that the heat exchanger 2 shown in FIG.
5 is added so that the effects of the first embodiment and the effects of the second embodiment described above can be obtained at the same time.

The sludge drying device 1b shown in FIG.
Then, while the separation cylinder 4 is rotated by the motor 3 of the centrifugal thin film dryer 8, the separation cylinder 4 is heated by the steam 2 supplied from the boiler equipment, and the steam drain 9 generated thereby is heat-exchanged via the trap 10. After being supplied to the vessel 25, it is returned to the boiler equipment. Sludge water 5 to be treated is separated into dry sludge 6 and dry exhaust gas 7.

In parallel with this operation, the negative pressure obtained by driving the blower 17 extracts the dried exhaust gas 7 from the centrifugal thin film dryer 8, and the heat of the dried exhaust gas 7 in the heat exchanger 13 The air taken in from the outside is heated. The heated air is supplied to the conveyor 11. Then, by supplying this heated air, moisture is removed from the dried sludge 6 discharged from the centrifugal thin film dryer 8 and placed on the conveyor 11, and then the dried sludge is carried out to the outside.

The dried exhaust gas 7 taken out from the centrifugal thin film dryer 8 and heat-exchanged by the heat exchanger 13 is cooled by the scrubber 16 to remove excess water and impurities, and then by the heat exchanger 25. Be heated. The dried exhaust gas 7 after heating is further heated by the heater 18,
After decomposing and deodorizing in the catalytic reactor 20 of the catalytic combustor 21,
It is discharged to the outside.

As described above, in the third embodiment,
The dried exhaust gas 7 is taken out from the centrifugal thin film dryer 8, and the heat taken in by the heat exchanger 13 heats the air taken in from the outside by the heat of the dried exhaust gas 7 to convey the heated air to the conveyor 11.
Of the steam 2 used to heat the centrifugal thin film dryer 8 while removing the water from the dried sludge 6 on the conveyor 11 and the steam drain 9 of the steam 2 used to heat the centrifugal thin film dryer 8 to the heat exchanger. 25, and this heat exchanger 2
The heat exchange action of 5 heats the dry exhaust gas 7 discharged from the centrifugal thin film dryer 7 and after the excess water and impurities are removed by the scrubber 16, and the heated dry exhaust gas 7 is further heated by the heater 18. After heating to a predetermined temperature, the catalytic reactor 20 of the catalytic combustor 21 decomposes and deodorizes it, and then discharges it to the outside. Therefore, while significantly reducing the energy consumption of the entire apparatus, drying is performed. The exhaust gas 7 can be deodorized, the water content of the dry sludge 6 can be reduced, the amount of the dry sludge 6 discharged in the sludge treatment can be reduced, and the reuse of the dry sludge 6 can be promoted. .

<< Description of Other Embodiments >> Also, the above-mentioned first embodiment
In the third embodiment, the dry exhaust gas 7 discharged from the centrifugal thin film dryer 8 is cooled by the scrubber 16 to remove excess water, impurities, etc., but instead of such a scrubber 16. Alternatively, a condenser may be used.

Even in this case, the same effects as those of the above-mentioned first to third embodiments can be obtained.

Although the sludge water 5 is treated in the above-mentioned first to third embodiments, in addition to such sludge water 5, it is necessary to separate solid matter and water. You may make it process a certain process target object, for example, a general waste liquid.

In the first and third embodiments described above, the dry exhaust gas 7 discharged from the centrifugal thin film dryer 8 is introduced into the heat exchanger 13 to heat the air introduced from the outside.
Although the heated air is guided to the conveyor 11 to remove water from the dried sludge 6 placed on the conveyor 11, heat other than the dry exhaust gas 7 discharged from the centrifugal thin film dryer 8 is used. A fluid, for example, a vapor drain 9 discharged from the centrifugal thin film dryer 8 is guided to a heat exchanger 13 to heat the air introduced from the outside, and the heated air is guided to a conveyor 11 to be mounted on the conveyor 11. Moisture may be removed from the placed dry sludge 6.

Even in this case, as in the first and third embodiments described above, the water content of the dried sludge 6 can be reduced to reduce the amount of the dried sludge 6 discharged in the sludge treatment. It is possible to promote the reuse of the dried sludge 6, for example, processing such as brick or feed.

In the second and third embodiments described above, the steam drain 9 discharged from the centrifugal thin film dryer 8 is guided to the heat exchanger 25 to heat the dry exhaust gas 7 discharged from the blower 17. However, the heat fluid other than the vapor drain 9 discharged from the centrifugal thin film dryer 8, for example, the dried exhaust gas 7 discharged from the centrifugal thin film dryer 8 is guided to the heat exchanger 25 and then to the scrubber 16. In this way, the dry exhaust gas 7 discharged from the blower 17 may be heated.

Even in this case, as in the second and third embodiments described above, the amount of power consumed by the heater 18 is greatly reduced, and the energy consumption of the entire device is significantly reduced. Meanwhile, the dry exhaust gas 7 can be deodorized.

[0041]

As described above, according to the invention of claim 1, the water content of the dried sludge can be reduced to reduce the amount of the dried sludge produced in the sludge treatment, and the reuse of the dried sludge can be promoted. can do.

Further, according to the second aspect of the invention, it is possible to deodorize the dry exhaust gas while significantly reducing the power consumption of the electric power used by the heater and significantly reducing the energy consumption of the entire apparatus.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a sludge drying device according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the sludge drying device according to the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the sludge drying device according to the present invention.

FIG. 4 is a configuration diagram showing an example of a conventionally known centrifugal thin film drying type sludge drying device.

[Explanation of symbols]

 1, 1a, 1b Sludge dryer 2 Steam (thermal fluid) 3 Motor 4 Separation cylinder 5 Sludge water 6 Dry sludge 7 Dry exhaust gas (thermal fluid) 8 Centrifugal thin film dryer 9 Vapor drain (thermal fluid) 10 Trap 11 Conveyor (re) Dryer) 12 Filter 13 Heat exchanger 14 Cooling water 15 Waste water 16 Scrubber (water / impurity remover) 17 Blower 18 Heater 19 Heat exchanger 20 Catalytic reactor 21 Catalytic combustor 25 Heat exchanger

Claims (2)

[Claims] 1. A centrifugal thin film dryer that dehydrates by a centrifugal thin film method while heating sludge water to be treated by a hot fluid supplied from the outside, and dry exhaust gas discharged from this centrifugal thin film dryer or the centrifugal A heat exchanger that heats the drying air by the hot fluid discharged from the thin film dryer, and re-drying that further dries the dried sludge discharged from the centrifugal thin film dryer by the drying air heated by this heat exchanger. And a water / impurity remover provided in the latter stage of the heat exchanger to cool the dry exhaust gas discharged from the centrifugal thin film dryer to remove excess water and water-soluble impurities, and this water / impurity remover A heater for heating the dry exhaust gas discharged from the catalyst, and a catalytic combustor for decomposing the dry exhaust gas heated by the heater by the action of the catalyst to deodorize the dry exhaust gas. A sludge drying device characterized in that 2. A centrifugal thin film dryer that dehydrates by a centrifugal thin film method while heating sludge water to be treated by a hot fluid supplied from the outside, and cools dry exhaust gas discharged from this centrifugal thin film dryer. Water / impurity remover for removing excess water and water-soluble impurities, and exhausted from the water / impurity remover by dry exhaust gas discharged from the centrifugal thin film dryer or hot fluid discharged from the centrifugal thin film dryer. A heat exchanger for heating the dry exhaust gas, a heater for heating the dry exhaust gas discharged from the heat exchanger, and a catalytic combustor for deodorizing the dry exhaust gas heated by the heater by the action of the catalyst And a sludge drying device.