TWI458926B - Closed air cycle sludge dryer - Google Patents

Closed air cycle sludge dryer Download PDF

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Publication number
TWI458926B
TWI458926B TW101111364A TW101111364A TWI458926B TW I458926 B TWI458926 B TW I458926B TW 101111364 A TW101111364 A TW 101111364A TW 101111364 A TW101111364 A TW 101111364A TW I458926 B TWI458926 B TW I458926B
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TW
Taiwan
Prior art keywords
air
sludge
sludge drying
condenser
heat exchange
Prior art date
Application number
TW101111364A
Other languages
Chinese (zh)
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TW201317529A (en
Inventor
Wenhung Chien
Chunjung Chen
Taijui Chiang
Chihhsi Liang
Jenkang Tiao
Original Assignee
Au Optronics Corp
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Publication date
Priority to CN201110334970 priority Critical
Application filed by Au Optronics Corp filed Critical Au Optronics Corp
Publication of TW201317529A publication Critical patent/TW201317529A/en
Application granted granted Critical
Publication of TWI458926B publication Critical patent/TWI458926B/en

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Description

Closed air circulation sludge dryer

This invention relates to a sludge dryer, and more particularly to a closed air circulating sludge dryer.

A plant with a sewage treatment plant usually needs a sludge dryer to dewater the sludge and then dry it, so as to reduce the water content of the sludge, thereby achieving the purpose of sludge reduction and stabilization, and reducing the transportation of sludge disposal. The cost of the final treatment. In order to achieve sludge reduction and reduce sludge transportation costs, there are many different types of sludge drying equipment on the market. Many of the existing sludge drying equipments use a refrigerant to cool down to achieve the function of dehumidification, and use a heating device to provide a heat source required for heating the air. These devices are costly, complex, and use a lot of power when they are working, which consumes a lot of energy.

In view of this, how to design a sludge drying equipment to save energy and reduce equipment cost is an urgent problem for the technicians in the industry.

It is an object of the present invention to provide a closed air circulating sludge dryer using waste heat to save energy and reduce equipment costs.

According to an embodiment of the invention, a closed air circulating sludge dryer comprising a sludge drying tank, a condenser, a heat exchange device, a closed air circulation circuit, a waste heat source and a chiller is provided. The closed air circulation circuit is connected to the sludge drying tank, the condenser and the heat exchange device. The waste heat source is used to supply thermal energy to the heat exchange device. The chiller is used to remove the heat generated by the condenser. The sludge drying box generates air containing water, and the air containing water is heated by the condenser to cool and dehumidify and heat the heat exchange device, and then enters the sludge drying box to take away the moisture in the sludge drying box, and then generates moisture containing air. recycle. Further, the air used in the closed air circulation sludge dryer belongs to a state of circulating air, especially in the air of the closed air circulation circuit, which does not perform any exchange process with the outside.

The closed air circulation sludge dryer further comprises a fan disposed between the heat exchange device and the sludge drying tank to drive the heated air into the sludge drying box. The enclosed air circulation circuit contains a cold air intake line connecting the condenser to the heat exchange unit. The enclosed air circulation circuit includes a hot air intake line connecting the heat exchange unit and the sludge drying tank. The exhaust port of the hot air intake pipe is connected to the lower half of the sludge drying tank. The enclosed air circulation circuit includes a hot air exhaust line connecting the sludge drying tank and the condenser. The waste heat source contains a compressed air. The heat exchange device may include a cavity and a partitioning mechanism. The partitioning mechanism divides the cavity into a first flow channel and a second flow channel, and the air and compressed air after cooling and dehumidification enter the first flow channel and the second flow channel respectively. The separation mechanism performs heat exchange. Alternatively, the heat exchange device can include a chamber, a first exchanger, a second heat exchanger, and a liquid recycle loop. The cavity is located between the condenser and the sludge drying oven. The first heat exchanger is for heat exchange with the waste heat source. The second heat exchanger is disposed in the cavity for heat exchange with the air after cooling and dehumidification. The liquid circulation circuit connects the first heat exchanger and the second heat exchanger. The temperature of the waste heat source is less than or equal to 130 degrees Celsius.

Since the air passing through the sludge drying box is closed and used, it is not easy to have odor leakage and affect the environment. In addition, by using the low-order waste heat in the factory as the heat source for heating the air, in addition to the energy-saving effect, the waste heat can be cooled, and the effect of energy saving and carbon reduction can be achieved.

The spirit and scope of the present invention will be apparent from the following description of the preferred embodiments of the invention. The spirit and scope of the invention are not departed.

Referring to Fig. 1, there is shown a block diagram of an embodiment of a closed air circulating sludge dryer of the present invention. The closed air circulating sludge dryer 100 includes a sludge drying tank 110, a condenser 120, a heat exchange device 130, a closed air circulation circuit 140, a waste heat source 150, and a chiller 160. The closed air circulation circuit 140 is connected to the sludge drying tank 110, the condenser 120 and the heat exchange device 130. The waste heat source 150 is used to supply thermal energy to the heat exchange device 130, and the chiller 160 is used to remove the heat energy generated by the condenser 120. The closed air circulating sludge dryer 100 further includes a fan 170 disposed between the heat exchange device 130 and the sludge drying tank 110.

After the air is heated by the heat exchange device 130, it becomes a high-temperature dry air having a low water content. The heated high-temperature dry air is driven by the blower 170, enters the sludge drying tank 110 from the closed air circulation circuit 140, and takes away the sludge. After the water vapor in the drying box 110 is turned into medium-temperature humid air, the medium-temperature humid air containing moisture is sent to the condenser 120 via the closed air circulation circuit 140, and after being cooled and dehumidified by the condenser 120 to become dry low-temperature air, After being sent to the heat exchange device 130 by the closed air circulation circuit 140 to be heated to a high temperature dry air, it is recycled again.

The so-called waste heat source 150 mainly refers to low-order waste heat in the factory, more specifically, it can be compressed air discharged from an air compressor or waste heat such as high-temperature steam, and the temperature of the waste heat source is less than or equal to 130 degrees Celsius. Since the closed air circulating sludge dryer 100 of the present invention provides the thermal energy preheating device 130 by using the waste heat source 150, the energy required for the conventional use of electric heating air can be saved, and the need for cooling the waste heat in the past can be saved. energy.

The heat exchange between the heat exchange unit 130 of the present invention and the waste heat source 150 can be carried out by means of a heat exchange form of the gas to the liquid or a heat exchange form of the gas to the gas, which will be specifically described below by way of examples.

Referring to Figure 2, there is shown a schematic view of another embodiment of a closed air circulating sludge dryer of the present invention. The closed air circulating sludge dryer 200 includes a sludge drying tank 210, a condenser 220, a heat exchange device 230, a closed air circulation circuit 240, a waste heat source 250, a chiller 260, and a blower 270. The sludge 212 is stored in the sludge drying tank 210. The enclosed air circulation circuit 240 communicates with the sludge drying tank 210, the condenser 220, and the heat exchange device 230. The waste heat source 250 is used to supply thermal energy to the heat exchange device 230, and the chiller 260 is used to remove the heat energy generated by the condenser 220. The fan 270 is disposed between the heat exchange device 230 and the sludge drying tank 210 to drive the heated air from the heat exchange device 230 into the sludge drying tank 210.

The enclosed air circulation circuit 240 includes a cold air intake line 242 that connects the condenser 220 and the heat exchange device 230 such that the low temperature dry air cooled and dehumidified via the condenser 220 enters the heat exchange device 230 via the cold air intake line 242. Heat up. Specifically, the closed air circulation sludge dryer 200 includes a first cavity 222, the condenser 220 is located in the first cavity 222, and the cold air intake pipe 242 is connected to the first cavity 222 and the heat exchange device 230.

The enclosed air circulation circuit 240 includes a hot air intake line 244 that connects the heat exchange unit 230 to the sludge drying tank 210. The fan 270 is disposed in the hot air intake pipe, so that the high-temperature dry air heated by the heat exchange device 230 enters the sludge drying tank 210 via the hot air intake pipe 244 by the driving of the fan 270, and takes away the moisture of the sludge 212. . In order to increase the contact time of the high temperature dry air with the sludge 212 to improve the drying effect of the sludge drying tank 210, the exhaust port 245 of the hot air intake line 244 is preferably connected to the lower half of the sludge drying tank 210. The high-temperature dry air is brought into full contact with the sludge 212 during the ascending process to take away the moisture contained in the sludge 212 and become the medium-temperature humid air.

The enclosed air circulation circuit 240 includes a hot air exhaust line 246 that connects the sludge drying tank 210 with the condenser 220, and more specifically, the hot air exhaust line 246 connects the sludge drying tank 210 with the first chamber 222. The air inlet 247 of the hot air exhaust line 246 is preferably located in the upper half of the sludge drying tank 210 to facilitate collection of moderate temperature humid air. The medium-temperature humid air containing moisture enters the first cavity 222 via the hot air exhaust line 246, and is cooled and dehumidified by the condenser 220. The closed air circulating sludge dryer 200 further includes a water collecting tray 224 disposed in the first cavity 222 and located below the condenser 220 to collect the condensed moisture.

The chiller 260 is coupled to the condenser 220 to remove heat generated by the condenser 220 for cooling. The chiller 260 can be a standalone host or shared with other implements in the plant to save space and equipment costs.

The heat exchange device 230 in this embodiment is a heat exchange form of a gas to a liquid. The heat exchange device 230 includes a second chamber 232, a first heat exchanger 234, a second heat exchanger 236, and a liquid recycle circuit 238. The second cavity 232 is disposed between the condenser 220 and the sludge drying tank 210, and the second cavity 232 is connected to the cold air intake pipe 242 and the hot air intake pipe 244, respectively. The first heat exchanger 234 is disposed in the second cavity 232. The second heat exchanger 234 is disposed adjacent to the waste heat source 250. The liquid circulation circuit 238 connects the first heat exchanger 234 and the second heat exchanger 236. After the second heat exchanger 236 exchanges heat with the hot gas of the waste heat source 250, the high temperature fluid therein, such as water or cold coal, enters the first heat exchanger 234 via the liquid circulation circuit 238 to make the first heat The exchanger 234 exchanges heat with the low temperature dry air cooled by the condenser 220 by the high temperature fluid, and then the cooled fluid in the first heat exchanger 234 is sent to the second heat exchanger 236 via the liquid circulation circuit 238 again. The waste heat source 250 is subjected to heat exchange for recycling.

Since the closed air circulating sludge dryer 200 is the heat energy required to provide the heat exchange device 230 by using the waste heat source 250, the energy required for the conventional use of electric heating air can be saved, and the energy required to cool the waste heat in the past can be saved. Reach environmental protection. In addition, the heat exchange form of the gas to the liquid is suitable for higher-order waste heat, such as waste heat of 130 degrees Celsius or a place farther from the transfer line. First, the heat source is converted into a liquid type and then transported to the far end, which is more economical for installation cost and space.

Referring to Figure 3, there is shown a schematic view of yet another embodiment of a closed air circulating sludge dryer of the present invention. The closed air circulating sludge dryer 200 includes a sludge drying tank 210, a condenser 220, a heat exchange unit 230', a closed air circulation circuit 240, a waste heat source 250, a chiller 260, and a blower 270. The sludge 212 is stored in the sludge drying tank 210. The enclosed air circulation circuit 240 communicates with the sludge drying tank 210, the condenser 220, and the heat exchange unit 230'. The waste heat source 250 is used to supply thermal energy to the heat exchange unit 230', and the chiller 260 is used to remove the heat energy generated by the condenser 220. The fan 270 is disposed between the heat exchange unit 230' and the sludge drying tank 210 to drive the heated air from the heat exchange unit 230' to the sludge drying tank 210.

The difference between this embodiment and the previous embodiment is that the heat exchange device 230' in this embodiment is in a gaseous to gaseous heat exchange form. The following description is only for the components related to the heat exchange device 230'. For the structure and function of the remaining components, refer to the previous embodiment, and details are not described herein again.

The heat exchange device 230' includes a second cavity 232 and a partitioning mechanism 231. The partitioning mechanism 231 divides the second cavity 232 into first and second flow paths 233, 235, which are isolated from each other. The first flow passage 233 connects the cold air intake line 242 and the hot air intake line 244. The air cooled and dehumidified by the condenser 220 flows into the first flow path 233. The waste heat source 250, such as low-order waste heat steam of about 100 degrees Celsius, enters the second flow channel 235, the relatively low temperature air in the first flow channel 233 and the relatively high temperature air in the second flow channel 235, by the partition mechanism 231 performs heat exchange to heat the low-temperature dry air to dry air at a high temperature. Since the closed air circulation sludge dryer 200 is the heat energy required to supply the heat exchange device 230' by using the waste heat source 250, the energy required for the conventional use of electric heating air can be saved, and in addition, the low-order waste heat is recovered to directly serve as a heat exchange device. The 230 heat source can also reduce the energy required to cool down or heat the waste heat at other temperatures to achieve environmental protection. This gaseous to gaseous heat exchange form is suitable for lower order, such as gas waste heat at a temperature of about 100 degrees Celsius, or a device with a short transmission distance, and has good heat exchange efficiency.

It will be apparent from the above-described preferred embodiments of the present invention that the application of the present invention has the following advantages. Since the air passing through the sludge drying box is closed and used, it is not easy to have odor leakage and affect the environment. In addition, by using the low-order waste heat in the factory as the heat source for heating the air, in addition to the energy-saving effect, the waste heat can be cooled, and the effect of energy saving and carbon reduction can be achieved.

Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and it is obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100. . . Closed air circulation sludge dryer

110, 210. . . Sludge drying oven

120, 220. . . Condenser

130, 230, 230’. . . Heat exchange device

140, 240. . . Closed air circulation circuit

150, 250. . . Waste heat source

160, 260. . . Ice water machine

170, 270. . . Fan

212. . . sludge

222. . . First cavity

224. . . Water tray

231. . . Separation mechanism

232. . . Second cavity

233. . . First runner

234. . . First heat exchanger

235. . . Second flow path

236. . . Second heat exchanger

238. . . Liquid circulation circuit

242. . . Cold air intake pipe

244. . . Hot air intake pipe

245. . . exhaust vent

246. . . Hot air exhaust pipe

247. . . Air inlet

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Fig. 1 is a block diagram showing an embodiment of a closed air circulating sludge dryer of the present invention.

Fig. 2 is a schematic view showing another embodiment of the closed air circulating sludge dryer of the present invention.

Fig. 3 is a schematic view showing still another embodiment of the closed air circulating sludge dryer of the present invention.

100. . . Closed air circulation sludge dryer

110. . . Sludge drying oven

120. . . Condenser

130. . . Heat exchange device

140. . . Closed air circulation circuit

150. . . Waste heat source

160. . . Ice water machine

170. . . Fan

Claims (8)

  1. A closed air circulating sludge dryer comprises: a sludge drying tank; a condenser; a waste heat source; a heat exchange device comprising: a cavity between the condenser and the sludge drying tank; a first heat exchanger for exchanging heat with the waste heat source; a second heat exchanger disposed in the cavity; and a liquid circulation circuit connecting the first heat exchanger and the second heat exchanger a closed air circulation loop connecting the sludge drying tank, the condenser and the heat exchange device, and a chiller to remove heat energy generated by the condenser, wherein the sludge drying tank generates a moisture content Air, the moisture-containing air is cooled and dehumidified by the condenser and heated by the second heat exchanger, and then enters the sludge drying box to take away the moisture in the sludge drying box, and then the moisture-containing air is generated. recycle.
  2. A closed air circulating sludge dryer comprising: a sludge drying tank; a condenser; a waste heat source comprising compressed air; a heat exchange device comprising a cavity and a partitioning mechanism, the partitioning mechanism dividing the cavity into a first flow path and a second flow path; and an ice water machine And removing the heat energy generated by the condenser, wherein the sludge drying box generates a moisture-containing air, and the moisture-containing air is cooled and dehumidified via the condenser, and the cooled and dehumidified air and the compressed air respectively enter the first The first-class road and the second flow path are heat-exchanged by the partitioning mechanism, and then the air enters the sludge drying box to take away the moisture in the sludge drying box, and then the moisture-containing air is generated and recycled.
  3. The closed air circulating sludge dryer according to claim 1 or 2, further comprising a fan disposed between the heat exchange device and the sludge drying tank to drive the heated air into the sludge Drying box.
  4. A closed air circulating sludge dryer according to claim 1 or 2, wherein the closed air circulation circuit comprises a cold air intake line connecting the condenser and the heat exchange device.
  5. The closed air circulating sludge dryer according to claim 1 or 2, wherein the closed air circulation circuit comprises a hot air inlet pipe connected to the heat exchange device and the sludge drying tank.
  6. The closed air circulating sludge dryer according to claim 4, wherein an exhaust port of the hot air intake pipe is connected to a lower half of the sludge drying tank.
  7. The closed air circulating sludge dryer according to claim 1 or 2, wherein the closed air circulation circuit comprises a hot air exhaust line connecting the sludge drying tank and the condenser.
  8. The closed air circulating sludge dryer according to claim 1 or 2, wherein the waste heat source has a temperature of less than or equal to 130 degrees Celsius.
TW101111364A 2011-10-26 2012-03-30 Closed air cycle sludge dryer TWI458926B (en)

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Application Number Priority Date Filing Date Title
CN201110334970 2011-10-26

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TWI458926B true TWI458926B (en) 2014-11-01

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KR101338369B1 (en) * 2013-11-08 2013-12-06 배희동 Equipment and method for renewable energy production process by continuous air circulation drying process without emission
CN104154723A (en) * 2014-08-14 2014-11-19 长沙开元仪器股份有限公司 Coal sample drying device and method
TWI588099B (en) * 2014-12-19 2017-06-21 鑏詳科技有限公司 Apparatus and method for slurry dewatering
CN105776811A (en) * 2016-05-05 2016-07-20 深圳市怡泰水处理有限公司 Sludge dewatering method and device
CN106382805A (en) * 2016-11-16 2017-02-08 长沙开元仪器股份有限公司 Drying equipment
CN107101493A (en) * 2017-06-09 2017-08-29 枞阳县程鹏水产养殖有限责任公司 A kind of fish meal processes special dendrobium candidum hot air circular drying machine
NO343915B1 (en) * 2018-01-16 2019-07-08 Waister As System and method of drying solid materials and liquid-solid mixtures

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CN1180205C (en) * 2001-05-16 2004-12-15 株式会社荏原制作所 Dehumidifier
CN100392335C (en) * 2005-07-26 2008-06-04 北京科技大学 Internal combustion engine driving heat pump fluidized bed drying device capable of recovering used heat

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CN1180205C (en) * 2001-05-16 2004-12-15 株式会社荏原制作所 Dehumidifier
CN100392335C (en) * 2005-07-26 2008-06-04 北京科技大学 Internal combustion engine driving heat pump fluidized bed drying device capable of recovering used heat

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Publication number Publication date
CN102603150A (en) 2012-07-25
TW201317529A (en) 2013-05-01

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