TWM617023U - Sludge dryer capable of dehumidifying circulating air in stages - Google Patents

Abstract

A sludge dryer capable of dehumidifying circulating air in stages comprises a sludge drying box, a heater, a rear-stage condensation dehumidifier and an ice water machine. The sludge drying box stores the water-containing sludge to be dried. The heater and the sludge drying box are connected by an air inlet pipe. The rear-stage condensation dehumidifier and the sludge drying box are connected by an exhaust pipe, and the rear-stage condensation dehumidifier and the heater are connected by a cold air pipe. The cold air pipe, the air inlet pipe and the exhaust pipe form a closed air circulation loop. The ice water produced by the ice water machine will flow into the rear-stage condensation dehumidifier to exchange heat with moist air entering the rear-stage condensation dehumidifier. It is characterized in that a front-stage condensation dehumidifier is arranged on the exhaust pipe and located between the rear-stage condensation dehumidifier and the sludge drying box, and the front-stage condensation dehumidifier is connected to a normal temperature cold water source. The moist air discharged from the sludge drying box will exchange heat with the cold water of the normal temperature cold water source before entering the rear-stage condensation dehumidifier to achieve the effect of staged condensation and dehumidification.

Description

Sludge dryer with circulating air segmented dehumidification

This creation is about a sludge dryer, especially a sludge dryer with circulating air segmented dehumidification and/or segmented heating.

The wastewater treatment plant of the factory usually uses a sludge dryer to further dry the sludge produced by the dewatering machine to achieve the purpose of sludge reduction and recycling or stabilization. Where there is waste heat in the factory, if the waste heat is used to heat the air of the drying medium and then ice water is used to condense and dehumidify the moisture from the drying medium through the sludge drying bed, the purpose of sludge drying with closed air circulation can be achieved. The creation patent I458926 discloses a closed air circulation sludge dryer, which includes a sludge drying box, a condenser, a heat exchange device, a closed air circulation circuit, a waste heat source and an ice water machine, the closed air circulation The circuit connects the sludge drying box, the condenser and the heat exchange device, the waste heat source supplies heat energy to the heat exchange device, and the ice water machine is used to remove the heat energy generated by the condenser. The closed air circulation sludge dryer can use low-level waste heat in the factory as a heat source for heating air, and has the effects of saving energy and cooling waste heat. However, the ice water machine requires a lot of energy in the process of making ice water. Therefore, the closed-air circulation sludge dryer uses ice water below 17°C as the only source of condensed water for circulating air, which will have another deficiency that consumes a lot of energy. . In addition, in the use of waste heat in the closed-air circulation sludge dryer, the use of a single heat exchanger to heat the circulating air will also limit the selection of waste heat sources, especially the selection of low-level waste heat sources.

For this reason, the main purpose of this creation is to provide a sludge dryer with segmented dehumidification of circulating air. The sludge dryer allows segmented dehumidification and/or segmented heating of circulating air in a closed air circulation loop for more efficient The use of recycled cold water and/or waste heat sources to achieve energy-saving effects.

The sludge dryer for dehumidifying the circulating air in sections of this creation includes a sludge drying box, a heater, a post-condensation dehumidifier, and an ice water machine. The sludge drying box provides storage of the water-containing sludge to be dried, and the sludge will generate humid air after being heated. The heater and the sludge drying box are connected by an air inlet pipe. The rear-stage condensing dehumidifier and the sludge drying box are connected by an exhaust pipe, the rear-stage condensing dehumidifier and the heater are connected by a cold air pipe, the cold air pipe and the air inlet pipe are connected with The exhaust pipe constitutes a closed air circulation circuit. The humid air generated by the sludge will be discharged from the exhaust pipe and flow in the air circulation circuit and sequentially pass through the downstream condensing dehumidifier to cool down and dehumidify. The heater heats up. The ice water machine is connected to the rear-stage condensation dehumidifier, and the ice water produced by the ice-water machine flows into the rear-stage condensation dehumidifier and exchanges heat with the moist air entering the rear-stage condensation dehumidifier, so that the humid air is condensed and dehumidified . It is characterized in that a front-stage condensation dehumidifier is arranged on the exhaust pipe and is located between the rear-stage condensation dehumidifier and the sludge drying box, and the front-stage condensation dehumidifier is connected to a normal temperature cold water source, which generates The temperature of the cold water is greater than that of the chiller. The moist air discharged from the sludge drying box will flow through the front condensing dehumidifier before entering the back condensing dehumidifier, and exchange heat with cold water at room temperature to achieve the effect of segmented condensation and dehumidification in a closed air circulation loop.

In one embodiment, the ice water temperature of the ice water machine is between 5-17 degrees Celsius, and the cold water temperature of the normal temperature cold water source is between 17-35 degrees Celsius.

In one embodiment, a fan is provided on the air circulation circuit to provide power for circulating air to flow in the air circulation circuit.

In one embodiment, a pre-heater is provided on the cold air pipeline and is located between the rear condensing dehumidifier and the heater, so that the air flowing out of the rear condensing dehumidifier will flow through before entering the heater The pre-heater heats up.

In one embodiment, the heat energy of the heater is supplied by a first waste heat source, the heat energy of the pre-heater is supplied by a second waste heat source, and the temperature of the second waste heat source is lower than the temperature of the first waste heat source .

In one embodiment, the second waste heat source recovers the waste heat of the first waste heat source.

The other objectives, advantages and features of this creation can be understood from the detailed description of the following preferred embodiments with reference to the accompanying drawings.

The specific embodiments are only examples but not for limitation, and the preferred structure content of the creation is described as follows with reference to the accompanying drawings:

Referring to Figures 1 and 2, there is shown a sludge dryer 10 for dehumidifying circulating air in stages according to an embodiment of the invention. The sludge dryer 10 includes a sludge drying box 12, a heater 14, and a post-condensation dehumidification器16, and an ice water machine 18. The sludge drying box 12 provides storage of the water-containing sludge 20 to be dried. The heater 14 and the sludge drying box 12 are connected by an air inlet pipe 22, so that the high-temperature dry air heated by the heater 14 will enter the sludge drying box 12 through the air inlet pipe 22. Take away the moisture of the sludge 20. In this embodiment, the heat energy of the heater 14 is supplied by a waste heat source 24. The waste heat source 24 can be, for example, compressed air discharged from an air compressor or waste heat gas such as high temperature water vapor, but it can also be other waste heat. energy.

The downstream condensing dehumidifier 16 and the sludge drying box 12 are connected by an exhaust pipe 26. When the water-containing sludge 20 in the sludge drying box 12 is heated, the high-temperature humid air is discharged through the exhaust pipe 26 and enters the rear condensing dehumidifier 16 to be condensed. In this embodiment, one end of the exhaust pipe 26 is connected to the top of the sludge drying box 12, and one end of the air intake pipe 22 is connected to the bottom of the sludge drying box 12. Furthermore, the rear-stage condensation dehumidifier 16 and the heater 14 are connected by a cold air pipe 28, so that the low-temperature dry air after being cooled and dehumidified by the rear-stage condensation dehumidifier 16 will enter the heater 14 through the cold air pipe 28 Heat up in the middle. The cold air pipe 28, the air inlet pipe 22 and the exhaust pipe 26 form a closed air circulation circuit 30, so that the humid air generated by the sludge 20 can flow in the air circulation circuit 30 and pass through The downstream condensing dehumidifier 16 cools and dehumidifies and the heater 14 heats up. In addition, a fan 32 is provided in the air circulation circuit 30 to provide power for air to flow and circulate in the air circulation circuit 30. In this embodiment, the fan 32 is arranged on the exhaust pipe 26.

The ice water machine 18 is connected to the rear-stage condensing dehumidifier 16 to provide condensing water for the latter-stage condensing dehumidifier 16. In a specific embodiment, the ice water machine 18 can produce ice water at 5-17 degrees Celsius. The ice water will flow through the rear-stage condensation dehumidifier 16 and interact with the moist air entering the rear-stage condensation dehumidifier 16 Heat exchange makes the humid air cool and dehumidify into dry low-temperature air.

According to a main feature of this creation, the sludge dryer 10 further includes a front-stage condensing dehumidifier 34. The front-stage condensing dehumidifier 34 is provided on the exhaust pipe 26 and is located between the rear-stage condensing dehumidifier 16 and the Between the sludge drying tanks 12 and the front-stage condensing dehumidifier 34 is connected to a normal temperature cold water source 36 to provide condensing water for the front-stage condensing dehumidifier 34. In a specific embodiment, the normal temperature cold water source 36 is, for example, recycled water or discharged water from a general factory or an institution. The temperature of the normal temperature cold water provided by the normal temperature cold water source 36 changes with the seasons, and is generally between 17-35 degrees Celsius. The cold water at room temperature will flow through the front-stage condensation dehumidifier 34 and exchange heat with the moist air entering the front-stage condensation dehumidifier 34, so that the humid air is cooled and dehumidified. Accordingly, when the humid air discharged from the sludge drying box 12 flows through the front-stage condensation dehumidifier 34 and the rear-stage condensation dehumidifier 16 in sequence, the room temperature cold water from the room temperature cold water source 36 will remove the dew point temperature of the front stage. High circulating air moisture, and the ice water of the ice water machine 18 can remove the moisture of the circulating air with a lower dew point temperature in the later stage, further reducing the absolute humidity of the circulating air, achieving the effect of segmented condensation and dehumidification to save energy. .

In the implementation of the sludge dryer 10 of the first embodiment of the invention, as shown by the arrow in Figure 2, the waste heat source 24 is used to provide thermal energy to the heater 14, and the circulating air flowing through the heater 14 will be heated to become The high-temperature dry air with low water content will enter the sludge drying box 12 through the air inlet pipe 22 to take away the moisture of the sludge 20, and become medium-temperature humid air and be discharged from the air inlet pipe 22. ; Next, the medium-temperature humid air will flow into the front condensing dehumidifier 34 to exchange heat with the normal temperature cold water of the normal temperature cold water source 36 to be condensed and dehumidified and part of the humid air will condense to form water droplets; then, from the front condensing dehumidifier 34 The outflowing air will flow into the rear-stage condensation dehumidifier 16 to exchange heat with the ice water of the ice water machine 18 and be condensed and dehumidified into low-temperature dry air; then, the low-temperature dry air flowing out of the rear-stage condensation dehumidifier 16 will pass through The cold air duct 28 flows into the heater 14 to heat it into high-temperature dry air, and then is sent into the sludge drying box 12 for recycling.

The sludge dryer 10 according to this creation is designed in the closed air circulation circuit 30 with a front-stage condensing dehumidifier 34 using a normal temperature cold water source 36 as condensate water, which can effectively save the traditional use of ice water machines in the closed air circulation circuit As a single condensate energy source. Specifically, according to the actual test of the sludge dryer 10 of the present invention, in an embodiment where the condensed water of the water-containing sludge 20 is 200 kg, the water condensed through the front-stage condensation dehumidifier 34 is about 92 kg. The condensed water through the rear-stage condensing dehumidifier 16 is about 108 kg. Since the room temperature cold water of the room temperature cold water source 36 does not require energy consumption, the sludge dryer 10 of the present invention can save about half of the energy used for condensation and dehumidification compared with a traditional sludge dryer that uses an ice water machine as a single condensate water.

Figures 3 and 4 show a sludge dryer 10 for dehumidifying circulating air in a second embodiment of the invention. In this embodiment, the sludge dryer 10 further includes a pre-heater 38, which is provided with The cold air pipeline 28 is located between the rear condensing dehumidifier 16 and the heater 14, so that the air flowing from the rear condensing dehumidifier 16 will flow through the pre-heater 38 to heat up before entering the heater 14. The heat energy of the pre-heater 38 is supplied by a waste heat source 40, which can be low-level waste heat with a lower temperature. In one embodiment, the temperature of the waste heat source of the heater 14 is set between 50 and 99 degrees Celsius, and the temperature of the waste heat source of the pre-heater 38 is set between 30 and 95 degrees Celsius. Furthermore, in a feasible embodiment, the waste heat source 40 of the pre-heater 38 can recover the waste heat of the waste heat source 24 of the heater 14 again. According to this embodiment, the sludge dryer 10 can use one or more waste heat sources, of which a waste heat source with a lower temperature is used as the heat energy of the preheater 38 to preheat the circulating air, and a waste heat source with a higher temperature is used as The heat energy of the heater 14 is used for reheating the circulating air, achieving the effect of making full use of the low-level waste heat of the factory.

The above are the detailed descriptions and drawings of the preferred embodiments of the creation, and are not intended to limit the creation. All the scope of the creation should be subject to the following patent scope, where the spirit of the patent scope and similar modified embodiments And similar structures should be included in this creation.

10: Sludge dryer

12: Sludge drying box

14: heater

16: Rear condensing dehumidifier

18: Ice water machine

20: Sludge

22: intake pipe

24: Waste heat source

26: Exhaust line

28: Cold air pipeline

30: Air circulation circuit

32: Fan

34: Front condensing dehumidifier

36: Cold water source at room temperature

38: Pre-heater

40: Waste heat source

Fig. 1 is a block diagram of a sludge dryer for dehumidifying circulating air in stages according to the first embodiment of the invention.

Figure 2 shows a schematic diagram of the sludge dryer of Figure 1.

Fig. 3 is a block diagram of a sludge dryer for dehumidifying circulating air in stages according to the second embodiment of the invention.

Figure 4 shows a schematic diagram of the sludge dryer of Figure 3.

10: Sludge dryer

12: Sludge drying box

14: heater

16: Rear condensing dehumidifier

18: Ice water machine

22: intake pipe

24: Waste heat source

26: Exhaust line

28: Cold air pipeline

30: Air circulation circuit

32: Fan

34: Front condensing dehumidifier

36: Cold water source at room temperature

38: Pre-heater

Claims (7)

A sludge dryer capable of dehumidifying circulating air in sections, including: A sludge drying box, which provides the storage of water-containing sludge to be dried, and the sludge will generate moist air when heated; A heater, which is connected to the sludge drying box by an air inlet pipe; A rear-stage condensing dehumidifier is connected with the sludge drying box by an exhaust pipe, the rear-stage condensing dehumidifier and the heater are connected by a cold air pipe, the cold air pipe and the air inlet pipe The air circuit and the exhaust pipe form a closed air circulation circuit, in which the humid air generated by the sludge will be discharged from the exhaust pipe and flow in the air circulation circuit, and the temperature will be lowered through the back-stage condensation dehumidifier in sequence Dehumidification and heating by the heater; An ice water machine, which is connected with the rear-stage condensation dehumidifier, the ice water produced by the ice-water machine flows into the rear-stage condensation dehumidifier and exchanges heat with the moist air entering the rear-stage condensation dehumidifier, so that the moist air is condensed Dehumidification It is characterized in that a front-stage condensation dehumidifier is arranged on the exhaust pipe and is located between the rear-stage condensation dehumidifier and the sludge drying box, and the front-stage condensation dehumidifier is connected to a normal temperature cold water source, and the normal temperature cold water source generates The cold water temperature is greater than the ice water temperature of the ice water machine, and the humid air discharged from the sludge drying box will flow through the front condensing dehumidifier before entering the rear condensing dehumidifier, and it is different from the normal temperature of the normal temperature cold water source. The cold water exchanges heat to achieve the effect of staged condensation and dehumidification in the closed air circulation loop. According to the sludge dryer of item 1 of the scope of patent application, the ice water temperature of the ice water machine is between 5-17 degrees Celsius, and the cold water temperature of the normal temperature cold water source is between 17-35 degrees Celsius. According to the sludge dryer according to the first item of the scope of patent application, a fan is provided on the air circulation circuit to provide the power for air to flow and circulate in the air circulation circuit. For the sludge dryer described in any one of items 1 to 3 in the scope of the patent application, a pre-heater is arranged on the cold air pipeline and is located between the downstream condensing dehumidifier and the heater, so that from the downstream The air flowing out of the condensing dehumidifier will flow through the pre-heater to heat up before entering the heater. The sludge dryer described in item 4 of the scope of patent application, wherein the heat energy of the heater is supplied by a first waste heat source, the heat energy of the pre-heater is supplied by a second waste heat source, and the second waste heat source The temperature of is less than the temperature of the first waste heat source. The sludge dryer described in item 5 of the scope of patent application, wherein the second waste heat source is to recycle the waste heat of the first waste heat source. The sludge dryer described in item 4 of the scope of patent application, wherein the waste heat source temperature of the heater is set between 50 and 99 degrees Celsius, and the waste heat source temperature of the pre-heater is set between 30 and 95 degrees Celsius .

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