KR20030072873A - An organic waste drying system - Google Patents

Abstract

PURPOSE: An organic waste drying system is provided to dry other waste step by step using evaporation steam generated during drying of a certain amount of organic waste and continuously dry the first dried waste using waste heat of incinerator as pulverizing the first dried waste so that organic waste is promptly and uniformly dried. CONSTITUTION: The organic waste drying system comprises first drying unit(100) comprising two drying chambers connected to each other through valve so that the two drying chambers have different pressure to heat organic waste injected by supplying a heating medium of high temperature and pressure into high pressure drying chamber and heat the organic waste in low pressure drying chamber using evaporation steam discharged from the high pressure drying chamber at the same time; a low pressure evaporation steam circulation unit(200) for removing moisture contained in the evaporation steam and supplying the moisture removed evaporation steam into the low pressure drying chamber again as circulating the evaporation steam discharged from the low pressure drying chamber of the first drying unit; second drying unit(600) having a sealed space into which the waste discharged from the first drying unit is dropped and simultaneously crushing the waste to size smaller than size of the waste during dropping in the sealed space by impacting the dropping waste and supplying hot air into the sealed space; a hot air deodorizing unit(700) for exhausting the deodorized waste hot air by deodorizing waste hot air discharged from the sealed space of the second drying unit; and a waste transfer unit(500) for transferring and dropping the waste discharged from the first drying unit into the sealed space of the second drying unit.

Description

Organic waste drying system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the drying of organic wastes such as sludge or food waste, and more particularly, to the latent heat of evaporated steam generated from drying wastes in order to incinerate or recycle dehydrated organic wastes. ) By drying the waste step by step and continuously drying the waste dried by steam using the waste heat generated from the waste incinerator to obtain high drying efficiency with low energy consumption, as well as odor of organic waste. The present invention relates to an organic waste drying system in which no effluent is released to the outside.

Recently, the treatment of various industrial wastes generated in large quantities according to the development of the industrial society has emerged as a serious social problem, and among them, many of them are suffering from the disposal of organic wastes such as food waste, sludge or sludge.

In other words, food waste and sludge are organic wastes that contain a lot of water, and if they are landfilled, they will not only cause serious environmental pollution such as soil pollution and groundwater pollution by leachate, but also require vast landfill sites. The seriousness of the treatment is very high.

As a result, organic waste recycling plans have been taken in various ways, and food waste has been actively promoted for feed and composting.In the case of sludge, for example, construction materials such as sidewalk blocks, cement materials, or fertilization by biological treatment, etc. This is actively examined.

However, sludge is a so-called industrial waste generated at various industrial sites such as large-scale operations, dyeing factories, leather, cardboard production plants, or sewage and wastewater treatment plants. Follow. Therefore, the sludge may be partially recycled as building materials, but most of the sludge is generally incinerated and then disposed of by landfilling the incineration residue.

On the other hand, since the sludge is a state in which fine particles and water are precipitated by the flocculant, the water content of the sludge cake reaches about 80% even if it is dehydrated in a sewage treatment plant. Therefore, in any case, whether to recycle or incinerate building materials, the minimization of the water content needs to be prioritized, which is particularly important for incineration.

To this end, various sludge drying techniques have been proposed. These techniques generally require a lot of energy, which imposes enormous energy costs for the treatment. Accordingly, a drying technology for energy saving is provided, and examples thereof include Korean Utility Model Publication No. 20-0204855 and Patent Registration No. 10-0298293.

Utility Model Registration No.0204855 configures a drying furnace in which sludge is fed and transported into the inside of the dryer body in a zigzag-shaped layer by a plurality of heat transfer plates, and installs a sludge transfer plate on each layer, and externally the bottom of each heat transfer plate. By installing the heat transfer duct for supplying the waste gas discharged from the incinerator, the sludge is transported in multiple stages and dried by incineration heat.

However, in the case of such a sludge dryer, it is necessary to form a drying furnace in which the sludge is conveyed in order to completely dry the sludge, so that the apparatus is excessively large. In addition, it is difficult to uniformly dry the inside of the sludge because the sludge is simply moved on the moving plate while the sludge is placed on the moving plate.

In addition, the waste gas of the incinerator, which has an exhaust temperature of several hundred degrees, is used as a heat source, so that the adhesive material in the sludge is easily adhered to the drying furnace, and in particular, since the evaporated vapor generated during drying is discharged to the outside, severe odor To pollute the atmosphere.

On the other hand, Patent No. 0298293, evaporation generated during drying by forming a condensation chamber having a heat exchanger so as to communicate with a drying chamber having a mixing mechanism, and having a feeding fan between the drying chamber and the condensing chamber to circulate the internal air. By removing the moisture in the steam and reheating the condensed air by the preheating mechanism installed in the internal air circulation path to supply to the drying chamber to remove the odor from the evaporated steam generated during drying and to improve the drying efficiency.

By the way, such organic waste fermentation and drying apparatus can bring about odor removal and some improvement in drying efficiency, but it was difficult to expect a great effect on overall energy saving.

That is, since the evaporated steam generated in the drying chamber is cooled while passing through the heat exchanger through which the refrigerant is circulated, the latent heat of evaporation (about 500 to 600 kW / kg) during drying is removed, and the specific heat of the heated air by the heater (about 24 Only ㎉ / ㎏) is circulated to the drying chamber can not be expected to greatly improve the drying efficiency, and because the cooling water corresponding to the amount of water evaporation is required will not contribute much to the overall energy savings.

The present invention was devised to solve the above-mentioned conventional problems, and incinerates the waste first dried by steam while gradually drying the waste using latent heat of evaporative steam generated during drying of organic waste. The purpose is to provide an organic waste drying system that can continuously improve the drying efficiency and drying rate while minimizing energy consumption by continuously drying the waste heat discharged from.

Another object of the present invention is to provide an organic waste drying system capable of reliably removing odors generated during drying while achieving high drying efficiency due to low energy consumption.

It is still another object of the present invention to provide an organic waste drying system which can reliably and simply dry waste by a continuous operation method while minimizing the size of the apparatus.

1 is a schematic view showing an organic waste drying system according to the present invention;

2 is a schematic view showing a primary drying unit of an organic waste drying system according to the present invention;

3 is a cross-sectional view schematically showing a dryer of the primary drying unit according to the present invention;

4 is a cross-sectional view taken along the line IV-IV of FIG. 3;

5 is a side view schematically showing a secondary drying unit of the organic waste drying system according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: first drying unit 110: high pressure dryer

112: high pressure drying chamber 113: heating jacket

115: stirrer 116: shaft

118: tube 125: scraper

130: low pressure dryer 150: waste transfer pipe

160: high-pressure evaporative steam transfer means 170: second high pressure dryer

190: second high-pressure evaporative steam transfer means 200: low-pressure evaporative steam circulation unit

210: low pressure steam circulating flow path 240: low pressure steam condenser

250: low-pressure evaporator heater 300: high-pressure evaporator circulation unit

400: second high-pressure evaporative steam circulation unit 500: waste transfer unit

600: second drying unit 610: chamber

620, 630: waste grinding means 640: hot air supply means

650: waste discharge means 700: hot air deodorization unit

In order to achieve the above objects, the organic waste drying system according to the present invention has two drying chambers connected through valves to have different pressures, and heats organic waste introduced by supplying a high-temperature and high-pressure heating medium to the high-pressure drying chamber. At the same time the first drying unit for heating the waste of the low pressure drying chamber with the evaporated steam discharged from the high pressure drying chamber; A low-pressure evaporative steam circulation unit which circulates the evaporated steam discharged from the low-pressure drying chamber of the first drying unit, removes water contained therein, and resupply the low-pressure drying chamber; A second drying unit having a sealed space in which the waste discharged from the first drying unit is dropped, pulverizing the waste falling from the sealed space into a smaller size than the dropping, and supplying hot air to the sealed space; A hot air deodorization unit which removes and exhausts the odor of the waste hot air discharged from the closed space of the second drying unit; And a waste transfer unit for transferring the waste discharged from the first drying unit to a closed space of the second drying unit.

According to one preferred feature of the present invention, the first drying unit includes a drying chamber in which waste to be dried is put and maintained at a predetermined pressure, a heating jacket installed on a wall of the drying chamber and supplied with a heating medium; A high pressure dryer having a stirrer installed inside the drying chamber and rotating by the driving means to crush and transport the waste to an appropriate size; Waste to be dried and maintained at a lower pressure than the drying chamber of the high-pressure dryer, a heating jacket installed on the wall of the drying chamber and supplied with a heating medium, and installed inside the drying chamber to be rotated by a driving means to optimize waste A low pressure dryer having a stirrer for crushing and conveying to a size; A waste conveying pipe having a valve which is opened and closed at a predetermined cycle and connecting a waste outlet of one of the dryers to a waste inlet of the other dryer; Heating medium supply means for supplying a heating medium having a predetermined pressure and temperature to a heating jacket of the high pressure dryer; It consists of a high-pressure evaporative steam transfer means for supplying the evaporated steam discharged from the waste in the high-pressure drying chamber to the heating jacket of the low-pressure dryer.

According to another preferred feature of the invention, the second drying unit comprises: a chamber (chamber) to which the waste discharged from the first drying unit is dropped; It consists of a rotating shaft rotatably supported in the chamber, a plurality of blades arranged at an appropriate angle on the outer periphery of the rotating shaft, and a motor for driving the rotating shaft and a motor for driving the rotating shaft. At least two waste crushing means disposed and disposed; Hot air supply means for supplying hot air generated from an external heat source into the chamber to evaporate moisture of the waste that is crushed and dropped by the waste crushing means; It consists of waste discharge means for discharging the waste crushed by the waste crushing means to the outside.

According to still another preferred feature of the present invention, a stirrer of each dryer includes a hollow shaft having both ends rotatably supported by a rotary joint through a drying chamber, and a constant length along the longitudinal direction of the shaft. Comprised of a plurality of tube-like supports arranged in the radial direction to be disposed at intervals to form a mutually proper angle, and a plurality of tubes having a shape corresponding to the spiral curve and fixed to the support at regular intervals along the longitudinal direction It consists of at least one set of wing bodies, and a heating medium is supplied therein.

Accordingly, the present invention can dry the same amount of other wastes step by step using evaporated steam generated when drying the amount of organic wastes, thereby drying the organic wastes corresponding to twice that amount with the heating medium. At the same time, the first dried waste is finely crushed and can be continuously dried using waste heat such as an incinerator, and thus organic waste can be dried very quickly and uniformly.

In addition, the stirrer of the dryer is configured in the form of a tube to supply a heating medium therein as well as to continuously dry the waste in multiple stages, thereby maximizing the drying efficiency of the organic waste and minimizing the apparatus.

In addition, after removing the moisture by condensing evaporated steam generated during the drying of the organic waste, the dry air can be re-supplied to the drying chamber to reliably block the emission of odor generated during drying to the outside, so the efficiency of drying organic waste It is also effective in improving reliability and saving energy.

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

In FIG. 1, the organic waste drying system according to the present invention has two drying chambers 112 connected through a valve 151 to have different pressures, and heats the low pressure drying chamber with the evaporated steam discharged from the high pressure drying chamber 112. Dropping the waste discharged from the first drying unit 100, the low-pressure steam circulating unit 200 for circulating the evaporated steam discharged from the low-pressure drying chamber of the first drying unit 100, and the first drying unit 100 While the second drying unit 600 and the crushing by applying a shock to the hot air at the same time, the hot air deodorization unit 700 and the first drying unit to remove the odor of the waste hot air discharged from the second drying unit 600 ( It is composed of a waste transfer unit 500 for transporting and dropping the waste discharged from the 100 to the second drying unit (600).

The first drying unit 100 comprises a set of high pressure and low pressure dryers 110 and 130, and a drying chamber 112 and a low pressure dryer 130 of the high pressure dryer 110 having different internal pressures. Discharge from the organic waste in the high-pressure drying chamber 112 and the heating medium supply means for supplying a heating medium of a predetermined pressure and temperature to the waste transport pipe 150 and the heating pipe 113 of the high-pressure dryer 110 to be partitionably connected. It consists of a high-pressure evaporative steam transfer means 160 for supplying the evaporated steam to the heating jacket of the low-pressure dryer (130).

The high pressure dryer 110 includes a main body 111 having a drying chamber 112 therein, a heating jacket 113 installed on the wall 112a of the drying chamber 112 and supplied with steam as a heating medium, and a main body ( It is composed of a stirrer 115 rotatably installed in the drying chamber 112 of the 111 and the cover 119 for closing the top opening of the main body 111 and conveyed while crushing the organic waste introduced into the appropriate size.

The main body 111 preferably has an approximately U-shaped cross section whose lower portion is formed in an arc shape. The main body 111 is formed by filling the heat insulating material 111a to minimize heat loss, and has a waste outlet 111b for discharging waste on one side of the lower surface thereof.

The heating jacket 113 is formed in a plate shape of an arcuate cross section so as to correspond to the lower part of the main body 111 and is embedded inside the wall 112a to surround the bottom portion of the drying chamber 112.

Here, the heating jacket 113 may be configured to be U-shaped so as to correspond to the cross-sectional shape of the main body 111 may be installed to surround the entire drying chamber 112, as shown in the pipe side on the side wall of the main body 111 The auxiliary heating jacket 114 may be provided together. In this case, the heating jacket 113 and the auxiliary heating jacket 114 is installed to communicate with each other.

Then, one side of the heating jacket 113 is provided with a heating steam inlet (113a) for supplying the heating steam, the other side is provided with a heating steam outlet (113b) for discharging the heating steam.

The stirrer 115 penetrates the drying chamber 112 and supports the shaft 116 supported at both ends of the main body 111, a plurality of supports 117 fixed to the shaft 116 in the radial direction, and each support 117. It consists of a spiral wing body 118 is fixed to.

The shaft 116 is hollow so that heated steam can be supplied therein, and both ends thereof are rotatably supported by the main body 111 by rotary joints 120 and 121 and a mechanical seal 122. . Each rotary joint 120 and 121 has a heated steam inlet 120a and an outlet 121a through which heated steam flows in or out.

The shaft 116 has a belt pulley or a sprocket wheel 123 or the like at one end thereof and is electrically connected to the motor 124.

The support 117 is disposed at regular intervals along the longitudinal direction of the shaft 116 to be installed at a predetermined angle to each other, which is also configured in the form of a tube so that the heating steam can be supplied therein to communicate with the shaft 116. do.

The wing body 118 is composed of three tubes 118a, 118b and 118c fixed to the support 117 at regular intervals along its longitudinal direction and supplied with heated steam therein, and each tube 118a ( 118b and 118c have a shape corresponding to the spiral curve. Preferably, the wing body 118 is provided with a plurality of sets to form a predetermined angle with each other.

In addition, a scraper 125 is attached to a tube 118c located at the outermost part of each wing body 118 to scrape and remove the waste stuck to the bottom of the drying chamber 112. For example, the scraper 125 may be configured in the form of a tab having a proper size as shown, and may be attached at appropriate intervals.

A waste inlet 119a is provided on one side of the lid 119, for example, on the opposite side of the waste outlet 111b of the main body 111, and an evaporative vapor outlet 119b through which evaporative steam generated during drying of organic waste is discharged. ) Is provided.

Since the low pressure dryer 130 has the same configuration as the high pressure dryer 110, detailed illustrations and descriptions are omitted for convenience, and only the portions shown in the drawings will be described with reference to the high pressure dryer 110. The low pressure dryer 130 is connected to a vacuum pump (not shown) to maintain an appropriate pressure relatively lower than the pressure of the high pressure dryer 110.

The waste transfer pipe 150 is connected to both ends of the waste outlet 111b of the high pressure dryer 110 and the waste inlet 139a of the low pressure dryer 130. Accordingly, the waste conveying pipe 150 has a valve 151 to partition the high pressure and low pressure dryers 110 and 130 to maintain the set pressure and to transfer the waste, such a valve 151 is For example, it may be composed of a rotary valve (rotary valve) is opened at a predetermined period.

The heating medium supply means is composed of, for example, a boiler and is connected to the heating steam inlet 113a and the outlet 113b of the high pressure dryer 110 and the heating jacket 113 through a conduit so that the heating steam can be circulated. Configure.

The high-pressure evaporation steam transport means 160 includes a high-pressure evaporation steam induction pipe 161 for inducing the evaporation steam discharged from the drying chamber 112 of the high-pressure dryer 110 to the heating jacket and the stirrer of the low-pressure dryer 130, and It is installed in the high-pressure evaporation steam induction pipe 161 and consists of a dust collector 162 such as a cyclone to remove foreign substances and a pressure feeding fan 163 for forcibly transferring evaporated steam.

One end of the high pressure steam induction pipe 161 is connected to the evaporative steam outlet (119b) of the high pressure dryer 110, the other end is connected to the heating steam inlet (139a) (140a) of the low pressure dryer (130), respectively.

The low pressure steam evaporator circulating unit 200 is a low pressure steam evaporator circulating flow path 210 connected to both ends of the evaporation steam outlet 139b of the low pressure dryer 130 and a drying chamber, and the evaporated steam generated from the low pressure dryer 130. It consists of a low-pressure evaporation steam conveying fan 220 for circulating through the low-pressure evaporation circulation passage (210).

A dust collector 230 is installed upstream of the low pressure steam evaporator circulating flow path 210, and a low pressure evaporator for condensing and removing moisture contained in the low pressure evaporator by circulating coolant therein in the downstream of the low pressure steam evaporator 230. A steam condenser 240 is installed, and a low pressure dry air heater 250 is installed downstream of the low pressure steam evaporator circulating flow path 210 to heat the low pressure dry air from which water is removed from the low pressure steam evaporator 240 to an appropriate temperature. do.

At this time, although not shown, the low-pressure steam condenser 240 is connected to a drain line for draining the condensate to the outside.

On the other hand, preferably, the high-pressure dryer 110 is also provided with a high-pressure evaporation steam circulation unit 300 for removing the water while circulating the evaporated steam through a predetermined path, and re-supply to the drying chamber (112).

The high-pressure evaporation steam circulation unit 300 also has a high-pressure evaporation steam circulation passage 310 connected to both ends of the evaporation steam outlet 119b of the high-pressure dryer 110 and the drying chamber 112, similarly to the low-pressure evaporation steam circulation unit 200. And, the high-pressure evaporation steam circulation path 310 is provided with a high-pressure evaporation steam transfer fan 320 for circulating the high-pressure evaporation steam.

In addition, the high-pressure evaporation steam circulation passage 310 is provided with a high-pressure evaporator dust collector 330, a high-pressure evaporator condenser 340 and a high-pressure dry air heater 350 in sequence.

Accordingly, the high-pressure evaporation steam induction pipe 161 of the high-pressure evaporation steam transporting means 160 is connected between the dust collector 330 and the high-pressure evaporation condenser 340 on the high-pressure evaporation steam circulation passage 310.

At this time, upstream of the high-pressure evaporation steam circulation passage 310 and the high-pressure evaporation steam induction pipe 161 branched from the high-pressure evaporation steam, as necessary, some or all of the high-pressure evaporation steam is the circulation passage 310 or the induction pipe 161. Flow path switching valves 360 and 370 may be installed to switch to be transferred to.

More preferably, a second high pressure dryer 170 is further provided at the rear of the high pressure dryer 110 to directly supply the heating steam to the heating jacket and the stirrer from the heating medium supply means.

The second high pressure dryer 170 is connected to the sludge inlet 179a by the waste outlet 111b of the high pressure dryer 110 and the second waste transfer pipe 190, and the second waste transfer pipe 190. Since the two high pressure dryers 110 and 170 are set to the same pressure, there is no separate valve unlike the waste conveying pipe 150.

In addition, the second high pressure evaporator 170 also removes water while circulating the evaporated steam generated in the drying chamber in a predetermined path, and then the second high-pressure evaporative steam circulation unit 400 for resupplying to the corresponding drying chamber is provided. It is provided.

The second high-pressure evaporative steam circulation unit 400 also has a second high-pressure evaporative steam circulation passage 410 having both ends connected to one end of the evaporative steam outlet 179b of the second high-pressure dryer 170 and the drying chamber, and the second high-pressure evaporation. The steam conveying fan 420 is configured. In addition, the second high-pressure evaporator dust collector 430, the second high-pressure evaporator condenser 440, and the second high-pressure dry air heater 450 are sequentially installed in the second high-pressure evaporative steam circulation passage 410.

The waste conveying unit 500 includes a first screw conveyor (510) for conveying the first dry organic waste discharged from the second high pressure dryer (170) waste outlet (171b) of the first drying unit (100), The second screw conveyor 520 for transferring the waste conveyed along the first screw conveyor 510 to the upper portion of the second drying unit 600 and the second waste conveyed by the second screw conveyor 520 will be described later. The waste feeder 530 is transported into the chamber (610) of the drying unit 600 to drop.

The first screw conveyor 510 and the waste feeder 530 are horizontally arranged to be installed side by side at a vertical interval, and the second screw conveyor 520 is disposed to be inclined therebetween so as to lift the waste.

For example, the waste feeder 530 may also be configured as a screw conveyor, and the waste feeder 530 and the guides of the first and second screw conveyors 510 and 520 have a cylindrical shape having inlets and outlets at both ends thereof. It is desirable to be.

The second drying unit 600 is a chamber 610 to which the organic waste transported from the first drying unit 100 is dropped, and the waste installed in the chamber 610 by impacting the falling waste is smaller than when Waste crushing means 620 and 630 for crushing, hot air supply means 640 for supplying hot air generated from an external heat source into the chamber 610 to evaporate moisture of the waste falling, and crushed and dried waste The waste discharge means for discharging to the outside 650 is configured.

The chamber 610 is preferably cylindrical and installed vertically by the frame 611 and has waste inlets (not shown) and outlets (not shown) at the top and bottom.

For example, two waste grinding means 620 and 630 are provided at the upper and lower portions of the chamber 610, respectively.

Each waste crushing means 620 and 630 are disposed in a rotating shaft (not shown) rotatably supported inside the chamber 610 and disposed in a state in which the waste is dropped at an appropriate angle to the outer circumference of the rotating shaft. And a plurality of blades (not shown) to strike and motors 621 and 631 for driving the rotating shaft.

The driving force transmission from the motors 621 and 631 can be achieved by, for example, fixing the pulleys to the shaft and the rotating shaft of the motor, respectively, and then winding the belts to connect the two pulleys.

Here, although the waste crushing means 620 and 630 have been described as being provided only at the upper and lower portions of the chamber 610, preferably, at least one of the two is further provided therebetween, so that the waste may be pulverized to a nearly particulate state. In this case, the water content of the waste can be dried to almost zero.

The hot air supply means 640 includes an external heat source, a hot air heater 641 that generates heat at a predetermined temperature, a blower (not shown) and a hot air heater (not shown) for supplying heat generated in the hot air heater 641 into the chamber 610. The hot air inlet duct 642 connecting the discharge port of the 641 and the lower portion of the chamber 610.

The hot air heater 641 may include, for example, a large-scale electric heater that generates heat at a predetermined temperature, but preferably, waste gas discharged from a waste incinerator, such as an incinerator for incineration of waste, may be used as a heat source. The chamber 610 is connected directly to the duct.

The upper part of the chamber 610 is provided with a hot air discharge duct 643 through which hot air used for drying the waste is discharged.

The waste discharging means 650 may basically be constituted by a screw conveyor 651 which is installed after the waste outlet of the chamber 610, and preferably discharged at an appropriate length to maintain the waste at a predetermined temperature as shown. By discharging through the furnace can be configured to be discharged while drying more during the discharge.

That is, a housing 652 having a cylinder-shaped guide 653 on one side of the upper surface of the screw conveyor 651 which is connected to the waste discharge port of the chamber 610 on one side of the upper surface is provided in an airtight structure. By installing the belt conveyor 654 horizontally moving the waste inside the housing 652 and supplying the hot air into the housing 652 through the branch duct 656 branched from the hot air inlet duct 642. The final dried waste is finally dried.

Accordingly, the other side of the upper surface of the housing 652 is connected to the hot air discharge duct (643). Then, a screw conveyor 655 is provided on the other lower surface of the housing 652 to discharge waste into a collecting container (not shown).

On the other hand, the hot air discharge duct 643 is connected to the subsequent hot air deodorization means 700, the hot air discharged to the chamber 610 and the housing 652 of the waste discharge means 650 in the middle of the hot air deodorization means 700 Has an exhaust blower (644) for forced conveyance.

Here, the hot air circulation duct 645 may be provided between the wake of the exhaust blower 644 and the hot air heater 641 to guide a part of the hot air exhausted to the hot air heater 641.

Hot air deodorization unit 700 has a lower end portion is connected to the hot air discharge duct (643) of the second drying unit 600, the main body 710 is introduced into the waste hot air used for drying the waste, and the ventilation slot 721 A baffle 720 provided in the main body 710, a filter 730 installed on the upper part of the baffle 720, and an external water supply source are collected for the baffle 720 and the filter 730. A collecting water nozzle 740 for injecting water and wastewater discharge means for discharging the sewage collected in the foreign matter in the waste hot air to the outside.

The main body 710 has a cylindrical shape and has an exhaust port 711 at the top thereof. The main body 710 is preferably connected to the hot air discharge duct 643 of the second drying unit 600 via a dust collector 712 such as a cyclone.

The baffle 720 has a conical roof 722 on the upper side of the ventilation slot 721, for example, two are arranged at intervals vertically.

Collector nozzles 740 are located at the top of each baffle 720 and the filter 730, connected to the water supply through the pipeline to inject the catch water to the roof 722 and the filter 730 of the baffle 720 Done.

And, the wastewater discharge means may be composed of a pipe connected to the lower portion of the main body 710, and a valve for installing the sewage in the main body 710 to the outside through the pipeline.

Next, the operation of the organic waste drying system according to the present invention configured as described above will be described.

First, in the low pressure dryer 130 drying chamber of the first drying unit 100, for example, dehydrated cake-like sludge is introduced and the apparatus is operated. Then, the sludge is conveyed while being crushed to an appropriate size by the stirrer and is discharged through the sludge discharge port 131b of the main body 131, and accordingly the sludge by the valve 151 of the waste conveying pipe 150 opened at a predetermined cycle. Is transferred to the drying chamber 112 of the high pressure dryer 110 by a predetermined amount.

Of course, at this time, the sludge of the initial input amount conveyed to the high pressure dryer 110 is in the initial input state because the heating medium is not supplied to the low pressure dryer 130.

Subsequently, when the sludge flows into the drying chamber 112 of the high pressure dryer 110, the sludge is properly crushed again by the rotating stirrer 115 and transferred to the waste outlet 111b while being supplied from the heating medium supply means. It is heated by high pressure heating steam and the moisture contained therein evaporates to dryness.

In this case, the heating steam is supplied together with the heating jacket 113 and the auxiliary heating jacket 114 installed in the wall 112a of the drying chamber 112 as well as the inside of the stirrer 115 having a tube shape. Therefore, the sludge is not only uniformly dried as a whole, but also reliably and quickly by the large heat transfer area.

That is, the stirrer 115 of the present invention is composed of a plurality of sets of wing bodies 118 composed of a plurality of spiral tubes 118a, 118b, and 118c, and is supplied with heating steam therein. Compared with the conventional jacket dependent, the heat transfer area in direct contact with the sludge is greatly increased, and since each wing body 118 properly crushes the sludge cake, heat transfer is reliably performed to the inside of the sludge so that the sludge can be dried uniformly and quickly. It can be.

In addition, a portion of the sludge being dried may be fixed to the bottom of the drying chamber 112 by the adhesive material contained therein, the present invention is a scraper in contact with the bottom of the drying chamber 112 on the wing body 118 of the stirrer 115. It is provided with 125 so that the bottom of the drying chamber 112 can be scraped from time to time during operation, so that the sludge is securely prevented.

Accordingly, the heat transfer surface of the heating jacket 113 is always kept clean and the heat transfer coefficient is ensured to the maximum, thereby minimizing heat loss due to sludge sticking, thereby improving drying efficiency.

On the other hand, after the evaporation vapor generated from the sludge during drying in the high-pressure dryer 110 is filtered foreign matter in the dust collector 162, some of the low-pressure dryer 130 as a heating medium through the high-pressure evaporation steam induction pipe 161. ), And part is re-supplied to the drying chamber 112 of the high-pressure dryer 110 through the high-pressure evaporation steam circulation passage (310).

The evaporation vapor of the high pressure dryer 110 pumped into the drying chamber and the stirrer of the low pressure dryer 130 is lower than the initial heating steam but maintains the high temperature and high pressure in which no latent heat of evaporation is removed, while the low pressure dryer 130 Since the drying chamber of the) maintains a lower pressure than the high pressure dryer 110, active heating is performed even in the low pressure dryer 130 according to the boiling temperature difference of the moisture according to the pressure.

Accordingly, the water of the sludge introduced into the drying chamber of the low pressure dryer 130 is evaporated as in the high pressure dryer 110 so that the sludge is dried.

That is, the low-pressure dryer 130 as it is without removing the evaporative latent heat (containing about 500 ~ 600㎉ per 1kg of water evaporation) contained in the evaporated steam generated during the sludge drying in the drying chamber 112 of the high-pressure dryer 110 By supplying to the drying chamber of the e), the sludge introduced into each drying chamber 112 is evaporated and dried by using the difference in boiling temperature of the heating medium (steam) according to the pressure difference between the high pressure drying chamber 112 and the low pressure drying chamber.

In more detail, for example, 1 kg of sludge in the high pressure drying chamber 112 in a state in which the pressure in the high pressure drying chamber 112 is set to 1.5 kg / cm 3 and the pressure in the low pressure drying chamber is set to 0.8 kg / cm 3. The cake is introduced and 1 kg of heated steam at a pressure of 3 kg / cm 3 and a temperature of 143 ° C. is fed from the boiler. Then, the water of the sludge cake introduced into the high pressure drying chamber 112 is evaporated at approximately 123 ° C. to generate 1 kg of evaporated steam having a pressure of 1.5 kg / cm 3 and a temperature of 123 ° C.

Subsequently, the high pressure evaporation steam generated in the high pressure drying chamber 112 is supplied to the low pressure drying chamber. At this time, since the low pressure drying chamber maintains a pressure of 0.8 kg / cm 3, the water of the injected sludge cake is evaporated at about 90 ° C. and the pressure is 0.8 kg / cm 3. 1 kg of evaporated steam at a temperature of 90 ° C is generated.

At this time, the difference between the heating temperature and the evaporation temperature of the high pressure drying chamber 112 is 20 ℃, the difference between the heating temperature and the evaporation temperature of the low pressure drying chamber (R2) is 33 ℃ bar evaporated steam generated in the high pressure drying chamber 112 is a low pressure drying chamber. It has a sufficient amount of heat and temperature as a heating medium for heating and drying the sludge cake added to the.

Accordingly, after preheating and drying in the low pressure dryer 130 except for the sludge of the initial input amount, the drying is transferred to the high pressure dryer 110 through the waste transport pipe 150 and dried again.

Meanwhile, the evaporated steam of the high pressure dryer 110 introduced into the high pressure evaporation steam circulation passage 310 is condensed and heated while being moved by the high pressure steam transfer fan 320 to the drying chamber 112 of the high pressure dryer 110. The resupply improves the drying efficiency in the high pressure dryer 110 and prevents odors.

That is, the high-pressure evaporator discharged from the high-pressure dryer 110 is cooled by heat exchange with the cooling water while passing through the high-pressure evaporator condenser 330, so that the moisture contained therein is removed as condensed water, and thus, the purified dry air has a high pressure. It is heated to an appropriate temperature while passing through the drying air heater 340 and supplied to the drying chamber 112 of the high pressure dryer 110 to block the external emission of the odor and to improve the drying speed and efficiency in the high pressure dryer 110. Is to come.

In addition, the evaporated steam generated in the low pressure dryer 130 is also not discharged to the outside, and is moved along the low pressure steam evaporation circulation passage 210 by the low pressure evaporation steam conveying fan 220, the condenser 240 and the heater 250. By condensation and heating by the re-supplied to the drying chamber of the low pressure dryer 130 to improve the drying efficiency in the low pressure dryer 130 and to prevent the occurrence of odor.

At this time, the condensed water removed from the high pressure and low pressure evaporation steam condenser 330, 240 and the evaporation steam of the high pressure dryer 100 used as a heating medium in the low pressure dryer 200 is drained to the outside through a drain line (not shown). .

Then, the sludge discharged after being dried again in the high pressure dryer 110 is transferred to the second high pressure dryer 170 through the second waste transfer pipe 190. The sludge transferred to the second high pressure dryer 170 is re-dried by the operation as described above by the high temperature and high pressure heating steam supplied from the heating medium supply means, and the evaporated steam of the second high pressure dryer 170 generated at this time. Also, it is condensed and heated as it is moved along the second high-pressure evaporative steam circulation passage 410 without being discharged to the outside and is supplied to the drying chamber again.

As such, the sludge continuously dried in multiple stages while passing through the first drying unit 100 is along the first and second screw conveyors 510 and 520 of the waste transporting unit 500, and the chamber of the second drying unit 600. 610 is transferred to the top. The sludge transferred to the second drying unit 600 is dropped into the chamber 610 by the waste feeder 530 of the waste transfer unit 500.

Then, the dropped sludge falls into the chamber 610 to be crushed to a smaller size by continuously hitting a plurality of blades provided on the rotating shaft of the upper waste crushing means 620 that rotates at high speed.

At the same time, the hot air supply means 640 is brought into contact with the hot hot air supplied to the lower portion of the chamber 610 to be heated, whereby the remaining moisture is evaporated and re-dried. At this time, the sludge is not only pulverized to a considerably small size by the upper waste crushing means 620, but also drastically dried while passing through the first drying unit 100, and thus easily dried when contacted with hot air.

Thereafter, the sludge is continuously dropped to the lower portion of the chamber 610 and again hits the blades provided on the rotary shaft of the lower waste crushing means 630 to be crushed to a smaller size, for example, almost in a particulate state and at the same time contacted with hot air, thereby further drying. The moisture content is almost zero.

At this time, since the sludge is almost dried in the lower waste crushing means 630, the sludge is further crushed, and the drying effect is also increased. This is because the temperature of the hot air at the time of first flowing into the chamber 610 is the highest because this point is close to the point where the lower waste crushing means 630 is located.

The sludge crushed by the lower waste crushing means 630 is disposed on the belt conveyor 654 in the housing 652 by a screw conveyor 651 of the waste discharging means 650 installed at the waste discharge port under the chamber 610. Is discharged.

Accordingly, after being finally dried by hot air supplied into the housing 652 through the branch duct 656 while moving on the belt conveyor 654, the outside is driven by the screw conveyor 655 installed at the outlet of the housing 652. To be discharged.

On the other hand, the waste hot air supplied from the hot air heater 641 to dry the sludge falling in the chamber 610 is forcibly discharged along the hot air discharge duct (643) by the exhaust blower (644), the hot air deodorization unit 700 It is introduced into the lower portion of the main body 710 via the dust collector 712 of the).

The waste hot air introduced into the main body 710 of the hot air deodorization unit 700 is moved to an upper portion thereof through the air vent slot 721 of the baffle 720, and passes through the filter 730 to the exhaust port 711 of the main body 710. Through the exhaust.

At this time, the collecting water is injected from the collecting water nozzle 740 to the roof 722 and the filter 730 of the baffle 720, whereby particulates such as odor particles contained in the waste hot air are removed by the collecting water and purified. Only air is released into the atmosphere.

As such, the present invention, the organic waste such as sludge or food waste dewatered in the sewage terminal treatment plant and the like drying through a plurality of drying steps in sequence to minimize the unit device, such as dryers to minimize the installation area It is possible to dry organic waste uniformly and reliably.

In particular, the device can be operated continuously as well as intermittent operation, not only can greatly improve the operation efficiency, but also makes it possible to dry organic waste very simply and quickly.

In addition, while using the evaporated steam generated in the high-pressure dryer 110 as a heating medium of the low-pressure dryer 130, it is possible to dry the waste corresponding to twice as the same amount of heating medium, while the cooling water is 50 Since only% is needed, the overall energy consumption is greatly reduced.

As described above, according to the organic waste drying system according to the present invention, the same amount of other wastes can be dried stepwise by using evaporated steam generated during drying of a certain amount of organic wastes. In addition to drying wastes corresponding to ships, the primary dried wastes can be crushed more finely and continuously dried using waste heat such as incinerators, so that organic wastes can be dried very quickly and uniformly. do.

In addition, the stirrer of the dryer is configured in the form of a tube, so that the heating medium is supplied to the inside thereof, and the waste is continuously dried in multiple stages, thereby maximizing the drying efficiency of organic waste and minimizing the size of the device. do.

In addition, after removing the moisture by condensing the evaporated steam generated during the drying of the organic waste, the dry air can be supplied back to the drying chamber to reliably block the odor generated during drying to be discharged to the outside.

Therefore, the present invention can greatly improve the efficiency, speed, and reliability of organic waste drying, and has a very excellent effect such as greatly reducing the overall energy consumption.

Claims (10)

It has two drying chambers connected by valves to have different pressures, and supplies the high-temperature and high-pressure heating medium to the high-pressure drying chamber to heat the organic wastes introduced, and simultaneously removes organic wastes from the low-pressure drying chamber with the evaporated steam discharged from the high-pressure drying chamber. A first drying unit for heating; A low pressure evaporative steam circulation unit which circulates the evaporated steam discharged from the low pressure dry chamber of the first drying unit and removes the water contained therein and resupply the low pressure dry chamber; A second drying unit having a sealed space in which the waste discharged from the first drying unit is dropped, pulverizing the waste falling from the sealed space to a smaller size than the dropping, and supplying hot air to the sealed space; A hot air deodorization unit for removing and discharging the odor of the waste hot air discharged from the closed space of the second drying unit; And a waste transfer unit transferring the waste discharged from the first drying unit to a closed space of the second drying unit. The method of claim 1, wherein the first drying unit, The organic waste to be dried is put into a drying chamber maintained at a predetermined pressure, a heating jacket installed on the wall of the drying chamber and supplied with a heating medium, and installed inside the drying chamber to be rotated by a driving means, thereby crushing waste to an appropriate size. A high pressure dryer having a stirrer to transfer; The organic waste to be dried is introduced and the drying chamber is maintained at a lower pressure than the drying chamber of the high pressure dryer, a heating jacket installed on the wall of the drying chamber and supplied with a heating medium, and installed inside the drying chamber to be rotated by a driving means. A low pressure dryer having a stirrer for crushing and conveying to an appropriate size; A waste conveying pipe having a valve which is opened and closed at a predetermined cycle and connecting a waste outlet of one of the dryers to a waste inlet of the other dryer; Heating medium supply means for supplying a heating medium having a predetermined pressure and temperature to a heating jacket of the high pressure dryer; Organic waste drying system, characterized in that consisting of a high-pressure evaporative steam transfer means for supplying the evaporated steam discharged from the organic waste in the high pressure drying chamber to the heating jacket of the low pressure dryer. According to claim 1 or 2, wherein the low-pressure evaporation unit circulation unit, Condensing moisture by cooling the low-pressure evaporation circulation flow path connected to different locations of the low-pressure drying chamber, the low-pressure evaporation steam transfer fan for moving the low-pressure evaporator along the low-pressure evaporation circulation flow path, and the moving low-pressure evaporator An organic waste drying system comprising a low pressure evaporator condenser and a low pressure dry air heater for heating the dried air from which water is removed to an appropriate temperature. The method of claim 1, wherein the second drying unit, A chamber in which organic waste discharged from the first drying unit is dropped; It consists of a rotating shaft rotatably supported in the chamber, a plurality of blades that are disposed at an appropriate angle on the outer periphery of the rotating shaft to hit the falling waste and the motor for driving the rotating shaft, spaced vertically in the chamber At least two waste crushing means disposed; Hot air supply means for supplying hot air generated from an external heat source into the chamber to evaporate moisture of the waste that is crushed and dropped by the waste crushing means; Organic waste drying system comprising a waste discharge means for discharging the waste crushed by the waste crushing means to the outside. According to claim 1, wherein the hot air deodorization unit, At least one baffle installed in the main body with a cylindrical main body having a lower end connected to a hot air outlet of the second drying unit chamber through a duct and having an exhaust port at an upper end thereof, and having a ventilation slot and a conical roof at the upper part of the ventilation slot; A filter installed on the upper part of the baffle, a collecting water nozzle which is connected to an external water supply source and sprays the collecting water to the roof and the filter of the baffle, and collects the foreign matter in the waste hot air to collect the sewage dropped to the lower part of the main body Organic waste drying system, characterized in that consisting of waste water discharge means for discharging to the outside. According to claim 1, The waste transfer unit, A first screw conveyor for transporting the organic waste discharged from the first drying unit, a second screw conveyor for transporting the organic waste discharged from the first screw conveyor to the upper part of the second drying unit chamber, and the second screw Organic waste drying system comprising a waste feeder for dropping the waste discharged from the conveyor into the interior of the chamber. The stirrer of claim 2, wherein each stirrer is A hollow shaft having both ends rotatably supported by a rotary joint through the drying chamber, and a plurality of tubular supports disposed radially to form a proper angle to each other at regular intervals along the longitudinal direction; Organic waste drying system, characterized in that it consists of at least one set of wing bodies having a shape corresponding to a spiral curve and consisting of a plurality of tubes fixed to a predetermined interval along the longitudinal direction to the supports, wherein a heating medium is supplied therein. . 8. The organic waste drying system according to claim 7, wherein a scraper for scraping the inner surface of the chamber is attached to the outermost tube of the wing of the stirrer. The method of claim 2, wherein both ends of the high-pressure evaporation steam circulation passage connected to the high-pressure dryer drying chamber, the high-pressure evaporation steam transfer fan for moving the high-pressure evaporation steam along the high-pressure evaporation steam circulation channel, It is further provided with a high-pressure evaporation steam circulation unit consisting of a high-pressure evaporator condenser for condensing water and a high-pressure dry air heater for heating the dry air from which water is removed to an appropriate temperature. And the high-pressure evaporative steam transport means is connected to the high-pressure evaporative steam circulation passage. The method of claim 4, wherein the waste discharge means, A screw conveyor installed to communicate with the lower end of the chamber, a belt conveyor installed under the screw conveyor for carrying waste, a housing having a waste inlet and an outlet for housing the belt conveyor, and a part of the hot air supplied to the chamber. Organic waste drying system, characterized in that consisting of hot air branch duct leading to the housing.