KR100967719B1 - Apparatus of steam type heat exchanging and method of heat exchanging sludge using the same and sludge treatment apparatus using the same - Google Patents

Abstract

The present invention relates to a steam heat exchange unit, a steam heat exchange method, and a sludge hydrolysis apparatus using the same, which cools high temperature sludge and heats low temperature sludge by using physical properties of water that is changed into gas and liquid according to temperature and pressure. .

To this end, the present invention is a high-temperature heat exchange vessel in which hot steam is generated by the difference in the vapor pressure due to the change in the state of the fluid changes into gas and liquid according to the temperature and pressure of the hot sludge, and the high temperature sludge is cooled, and The present invention provides a steam heat exchange unit and a steam heat exchange method including a low temperature heat exchanger container configured to raise a temperature by condensation of the high temperature water vapor while a sludge is introduced therein, and a sludge hydrolysis apparatus using the same.

Sludge, heat exchange, hydrolysis

Description

Steam heat exchange unit and steam heat exchange method using same and sludge hydrolysis apparatus using the same {Apparatus of steam type heat exchanging and method of heat exchanging sludge using the same and sludge treatment apparatus using the same}

The present invention relates to a steam heat exchange unit, a steam heat exchange method, and a sludge hydrolysis apparatus using the same in the hydrolysis technology of organic sludge, and more particularly, in the process of heating the sludge to hydrolyze the sludge, temperature and pressure Steam heat exchange unit, steam heat exchange method for cooling high temperature sludge and heating low temperature sludge by using the physical properties of water, which is converted into gas and liquid and transfers energy through water vapor during vaporization or liquefaction. It is related with the used sludge hydrolysis apparatus.

In general, when organic sludge (herein referred to as sludge) such as sewage sludge and food waste and livestock waste water is discharged as waste, it may cause environmental pollution such as leachate, odor and pest generation. On the other hand, the sludge contains more than 3000 kcal of energy per kg after drying, it would be very economically useful if the energy can be recovered during the treatment of the sludge, but the water content of the sludge is high to 80% so far, the sludge The energy involved is not being used economically.

In other words, the sludge can recover energy by removing more than 80% of the water contained or decomposing it into microorganisms, and many technologies have been developed for this purpose. Or there is a problem such as odor occurrence. Therefore, up to now, most of the sludge has been treated by ocean dumping or compost utilization.

On the other hand, the sludge is composed of nutrient organic substances such as carbohydrates, proteins, lipids, and the like, which are high molecular compounds in which glucose, amino acids, and fatty acids are combined. This phenomenon is called hydrolysis.

Although various methods for treating sludge have been devised using the hydrolysis principle, it is difficult to construct a device that can continuously operate while enduring high vapor pressure of water accompanying high temperature as well as a lot of thermal energy in the process of heating to a high temperature. The sludge hydrolysis device has not been put to practical use yet.

In particular, the conventional hydrolysis device has a problem that excessive heat energy required for temperature rise is required because the sludge at room temperature must be directly heated to 200 ° C. or higher in order to hydrolyze the sludge.

In addition, because of the large amount of heat energy used in the heating and cooling process in the repeated hydrolysis process and the energy used is discarded as it is, the heat loss is large and the efficiency of the device is low because it requires the installation and operation of a separate cooling device. There was a problem.

As described above, the hydrolysis device according to the prior art has a low energy efficiency because the amount of solids and the like recovered is less than that of the input thermal energy, so the method of treating waste sludge was not economical.

Therefore, a heat exchanger for heat exchange is required such that energy used for separate heating can be reused in the hydrolysis device, and a hydrolysis device to which a device capable of improving recovery energy efficiency compared to the supply energy is applied. This is required.

It is easy to understand that heat exchange of hot hydrolyzed sludge and cold sludge to be hydrolyzed is a good way to save energy, and the hydrolysis technology mentions the necessity of heat exchange, but the fluidity of dehydrated sludge is not good because of the poor heat transfer. The specific method of constituting a device for heat-exchanging low-temperature sludge has not been developed yet, so the total temperature is heated and cooled again in sludge hydrolysis.

On the other hand, water changes its state from liquid to gas according to temperature and pressure, and the temperature pressure curve of water from liquid to gas is called the vapor pressure curve of water. At a certain temperature, water is present as a liquid if the external pressure is higher than the vapor pressure curve pressure and as a gas when the external pressure is low.

When water changes its state to water vapor, it absorbs 540 kW / kg of energy at 1 atm, and the volume expands approximately 1700 times. When water changes from water vapor to water, it releases and condenses the same energy. The pressure and temperature relationship in the vapor pressure curve of the water is shown in Table 1. When the temperature increases, the vapor pressure of the water increases very rapidly, reaching 19.2 atm at 210 ° C where hydrolysis is good.

Temperature
(℃) pressure
(atmospheric pressure) Temperature
(℃) pressure
(atmospheric pressure) Temperature
(℃) pressure
(atmospheric pressure) Temperature
(℃) pressure
(atmospheric pressure) 100 1.0 140 3.6 180 10.0 220 23.3 110 1.4 150 4.7 190 12.6 230 28.2 120 2.0 160 6.2 200 15.6 240 33.8 130 2.7 170 7.9 210 19.2 250 40.1

In order to solve the above problems, the technical problem to be achieved by the present invention is to develop a specific technology and apparatus for reusing the energy used for heating the sludge during hydrolysis through heat exchange to heat exchange device that can increase the energy efficiency in hydrolysis To develop.

To this end, a container with a high vapor pressure environment of 20 atmospheres generated at 210 ° C., which is fluidized to apply heat to a sludge which is difficult to form a heat exchanger due to extremely poor fluidity and heat transfer, or is hydrolyzed effectively. Sludge is injected into the sludge, and a sludge pressurized injection device capable of discharging the sludge heated in the heat exchanger from the container is developed.

In addition, the present invention is to develop a technique for continuously hydrolyzing, and to develop a technique for reusing energy used for heating through heat exchange to reduce the energy required for heating as well as to cool the hydrolyzed hot sludge It is to develop a heat exchange unit that is not necessary.

For this purpose, since the vapor pressure of water is higher than atmospheric pressure to generate water vapor at a temperature of 100 ° C. or higher, in order to heat-exchange and heat using steam, when the high temperature sludge is low in pressure, water vapor is rapidly cooled and steam is cooled in the low temperature sludge. It is an object of the present invention to develop a steam heat exchange method for heat exchange of hot sludge and low temperature sludge by steam generation and condensation by using these properties.

In addition, the present invention is to cool the high temperature sludge by injecting, moving, and discharge the high temperature sludge in the hot sludge in the high temperature side heat exchange vessel to cool the high temperature sludge, by moving the water vapor generated in the high temperature side heat exchange vessel to the low temperature side heat exchange vessel By heating the cold sludge in contact with the sludge, a steam heat exchange unit that can exchange heat by moving steam between the cold sludge and the hot sludge is developed.

In addition, another object of the present invention is to arrange a plurality of steam heat exchanger units in series to repeat the heat exchange to reuse the energy several times to significantly reduce the heat energy required for hydrolysis and to continuously hydrolyze the sludge, sludge hydrolysis Is in developing the device.

In order to achieve the above-mentioned problem, the present invention is to the injection means and the sludge so that the suction pressure is not generated in the sludge of low temperature that is dehydrated as much as possible with high viscous resistance extremely poor fluidity is not sucked by the general pump By using the sludge injection device composed of a pressurizing means for applying a high pressure to make the sludge fluidized at a high pressure of 20 atm or more, it is configured to move the low temperature sludge to the device and the sealed path necessary for heat exchange heating.

In addition, the present invention is vaporized vapor condensation movement inside the vessel for the external heat transfer of the vessel in the heat pipe in which heat transfer is rapidly progressed from the high temperature portion to the low temperature portion by vaporization and condensation of the liquid in a closed vessel filled with only one liquid vapor In order to have the same effect as the method, when supplying the sludge of high temperature and low temperature to the sealed container, steam is generated, moved and condensed by the difference of vapor pressure, thereby utilizing the steam heat exchange method in which heat transfer is carried out from the hot sludge to the low temperature sludge inside the container. In addition, the steam heat exchange method is configured to heat exchange in the temperature range of 100 ℃ or more in which the steam pressure higher than the atmospheric pressure is applied.

Specifically, the steam heat exchange unit of the present invention comprises a hot heat exchanger container in which hot sludge is cooled and discharged while generating steam due to a pressure difference due to a high pressure of the sludge before injection and a low pressure inside the container into which the sludge is injected; A low temperature heat exchange container which is in contact with the water vapor while the injected low temperature sludge is moved and is heated up and discharged by condensation of the water vapor; And, the water vapor comprises a communication unit for providing a passage for moving from the high temperature heat exchange vessel to the low temperature heat exchange vessel.

Here, the high temperature sludge injection apparatus is installed in the injection portion of the high temperature heat exchanger container, and injects high pressure hot sludge into the high temperature heat exchanger container in a low pressure state; And,

It is preferable that the high temperature heat exchange vessel is provided in the discharge portion, and further comprises a high temperature sludge discharge device for discharging the hot sludge separated from the water vapor.

In addition, the pressure sensor is installed in the high temperature heat exchanger container for measuring the internal pressure of the high temperature heat exchanger container; And, it may be made of a high-temperature heat exchanger container further comprises a water level sensor for measuring the sludge level in the high temperature heat exchanger container.

Further, the hot sludge injection apparatus is controlled to maintain a constant pressure in the hot heat exchange vessel based on the measured value of the pressure sensor, and the sludge level in the hot heat exchange vessel is increased based on the measured value of the water level sensor. It is preferable to further comprise a control device for controlling the hot sludge discharge device to be kept constant.

The apparatus may further include a low temperature sludge conveying apparatus for transferring the low temperature sludge injected into the inlet of the low temperature heat exchanger to the outlet of the low temperature heat exchanger.

In this case, the low temperature sludge transport apparatus includes one end of the conveyor belt is installed at a position corresponding to the inlet of the low temperature heat exchange container, the other end is installed at a position corresponding to the discharge of the low temperature heat exchange container.

In addition, the cold sludge conveying apparatus includes a first rotating body for conveying the cold sludge downward while pushing the cold sludge toward the inner wall of the cold heat exchange vessel; A second rotating body transferring the low temperature sludge downward while drawing the low temperature sludge toward the center of the low temperature heat exchange vessel; And, it comprises a rotating shaft for rotating the first rotating body and the second rotating body.

On the other hand, it is installed in the injection unit of the low temperature heat exchange container, it may further comprise a distribution device for distributing and supplying the injected low temperature sludge to the upper portion of the low temperature sludge transport apparatus.

Here, the distribution device is installed to penetrate the upper portion of the low temperature heat exchange vessel and the fixed injection tube is injected with low-temperature sludge; An injection tank communicating with the fixed injection pipe and rotating; A connection device for connecting the fixed injection pipe and the injection tank; Preferably, the nozzle comprises a nozzle spaced apart from the central axis of the injection tank and installed at a position corresponding to an upper portion of the cold sludge conveying apparatus.

The apparatus may further include a pressure injection device which is installed at both sides or one side of the low temperature heat exchanger container and has injection means for preventing suction pressure from occurring in the low temperature sludge, and a pressurizing means for pressurizing the low temperature sludge via the injection means. It can be done by.

In this case, the injection means is a case having an inlet for allowing the cold sludge to flow into the lower portion by its own load, and a discharge port 111a through which the cold sludge is discharged; It is installed inside the case, the gear is coupled to each other and includes a pair of rotating body for pushing the cold sludge introduced from the inlet in the direction of the discharge port (111a).

In addition, the hot sludge injection apparatus includes a rotating part formed by passing a plurality of storage holes in the longitudinal direction; An upper cover installed at an upper portion of the rotating part and having a first through hole corresponding to any one of the storage holes; The lower cover may include a lower cover installed below the rotating part and having a second through hole corresponding to any one of the other storage holes except for the storage hole corresponding to the first through hole.

The hot sludge injection device and the hot sludge discharge device include a valve through which hot sludge is injected and discharged, and an adjusting unit for controlling the opening and closing degree of the valve.

On the other hand, the sludge hydrolysis apparatus using the steam heat exchange unit according to the present invention is a low temperature sludge hydrolyzed at high temperature by the supplied steam is heated unit discharged to the high temperature sludge; The low temperature sludge is supplied to the low temperature heat exchange vessel and the high temperature sludge is supplied to the high temperature heat exchange vessel, and the low temperature heat exchange vessel and the high temperature heat exchange vessel are formed in communication so that the steam generated in the high temperature heat exchange vessel after steam blasting and the low temperature heat exchange vessel Steam heat exchange unit for the low temperature sludge of the mutual heat exchange; And a contact heat exchange unit contacting the outer surface of the high temperature sludge tube through which the high temperature sludge discharged from the steam heat exchange unit moves to exchange heat with each other.

In addition, the steam heat exchange method using the steam heat exchange unit according to the present invention comprises the steps of introducing a high pressure hot sludge into the high temperature heat exchange vessel of a low pressure state; Introducing a low temperature sludge into the low temperature heat exchange vessel; Steam is generated due to the pressure change of the hot sludge to cool the hot sludge; In addition, the steam is condensed in contact with the low temperature sludge, wherein the low temperature sludge is heated.

The steam-type heat exchange unit and the sludge heat exchange method using the same according to the present invention described above and the effect of the sludge treatment apparatus using the same are as follows.

First, the sludge that is difficult to heat exchange due to poor fluidity is heat-exchanged with a steam heat exchange unit, thereby greatly reducing the heating energy required for sludge hydrolysis.

Secondly, by repeatedly configuring the steam heat exchanger, more energy is saved. By repeatedly configuring the steam heat exchanger, the heating energy required for heating to about 105 ° C. can be freely obtained by heat exchange, thereby reducing a lot of thermal energy costs.

Third, there is no need for a separate process and apparatus for cooling the hydrolyzed hot sludge discharged at high temperatures.

Fourth, in the continuous hydrolysis device configuration by providing a technique for heat-exchanging heat-heating in the temperature range of 100 ℃ or more to improve the energy efficiency of the overall hydrolysis device.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the steam heat exchange unit, a sludge heat exchange method using the same and a sludge treatment apparatus using the same according to the present invention.

1 to 4, in the steam heat exchange unit according to the present invention, steam is smoothly transferred from the low temperature heat exchange vessel 100, the high temperature heat exchange vessel 300, and the low temperature heat exchange vessel 300 to the low temperature heat exchange vessel 100. It includes a communication unit 200 to be connected to move and the inside is filled with water vapor to maintain the temperature and pressure of the steam pressure curve.

The high temperature heat exchange vessel 300 is connected to the water vapor generated in the low temperature heat exchange vessel 100 through the communication unit 200 to be able to move smoothly, high temperature sludge injection device 310, the container body 330, And it comprises a high temperature sludge discharge device (350).

Here, the hot sludge injection device 310 is provided at one side of the second injection hole 301 to adjust the injection amount of the hot sludge having a low viscosity injected through the second injection hole 301.

In detail, the high temperature sludge injection apparatus 310 may adjust the pressure inside the high temperature heat exchange vessel 300 by adjusting the opening and closing degree of the valve.

Accordingly, the high temperature sludge is explosively generated due to the difference between the high temperature steam pressure of the high temperature sludge injected by the high temperature sludge injection device 310 and the pressure in the high temperature heat exchange vessel 300. In this case, the hot sludge is injected into a vessel having a lower pressure than the vapor pressure of the steam, and the steam is exploded in the hot sludge and the sludge is cooled.

As described above, the high temperature water vapor generated in the high temperature heat exchange vessel 300 is moved to the low temperature heat exchange vessel 100 through the communication unit 200 connected to the high temperature heat exchange vessel 300 to the low temperature heat exchange vessel 100. The condensed water is rapidly converted into water after contact with the low temperature sludge transported from the high temperature vessel.

On the other hand, the hot sludge injection device 310 as described above is preferably made of a first ball valve for adjusting the injection cross-sectional area of the second injection port (301).

In addition, the high temperature sludge injection device 310, that is, the first ball valve worm gear 311 rotates by the driving force transmitted from the driving force transmission device (not shown), the worm wheel gear 313 interlocking with the worm gear 311 And a ball 315 connected to one side of the worm wheel gear 313 to adjust and seal the injection cross-sectional area of the second injection hole 301.

At this time, the ball 315 is provided in a spherical shape, the through hole 317 is formed in the center, it is connected by the worm wheel gear 313 and the connecting rod 314.

In addition, the ball 315 may be formed in one end and the other end of the through hole 317 has a diameter larger than the through hole 317 is recessed by a predetermined length toward the center of the ball 315 by a predetermined length. have.

On the other hand, the hot sludge discharge device 350 is the transport space 331 of the container body 330 is hot sludge injected through the hot sludge injection device 310 is separated from the water vapor and freely transported by its own weight After passing through, it is discharged to the second discharge port (111a) (309) side.

Here, the hot sludge discharge device 350 is preferably made of a second ball valve having the same structure as the hot sludge injection device 310 as described above.

The hot sludge discharge device 350 controls the discharge of hot sludge through the second outlets 111a and 309.

In addition, the high temperature heat exchange container 300 is preferably provided with a control device (not shown) for controlling the hot sludge injection device 310 and the hot sludge discharge device 350 on one side.

Here, the control device (not shown) is a pressure sensor (not shown) for detecting the water vapor pressure in the high temperature heat exchange vessel 300, a water level sensor (not shown) for detecting the level of the injected hot sludge, and the pressure It comprises a microcomputer (not shown) for controlling the hot sludge injection device 310 and the hot sludge discharge device 350 according to the value sensed by the sensor and the water level sensor.

The control device (not shown) as described above allows the hot sludge discharge device 350 to be controlled by the microcomputer according to the detected water level from the water level sensor to adjust the discharge amount, and adjust the pressure detected by the pressure sensor. In order to control the high temperature sludge injection apparatus 310 to maintain a constant water vapor pressure in the transport space 331 of the container body 330.

In detail, the opening and closing degree of the high temperature sludge injection device 310 is controlled by the control device (not shown) to adjust the amount of steam supplied to the inside of the high temperature heat exchange container 300, and according to the detected water level from the water level sensor. The opening and closing degree of the high temperature sludge discharge device 350 is adjusted to control the discharge amount.

As described above, the pressure (high pressure) of the hot sludge injected into the high temperature heat exchange vessel 300 and the pressure inside the high temperature heat exchange vessel 300, that is, the pressure in the transfer space 331 are kept constant. Hot sludge injected according to the pressure difference of the pressure (low pressure) of the transfer space 331 in the high temperature heat exchange vessel 300 may be vapor-blasted.

Therefore, the water vapor generated after the steam explosion by the pressure difference from the hot sludge is transferred by the low temperature sludge conveying apparatus 130 through the distribution vessel 122 of the low temperature heat exchange vessel 100 through the communication unit 200. In contact with the cold sludge, the water vapor rapidly condenses and turns into water, so that the pressure of the water vapor in the high temperature heat exchange vessel is kept constant.

On the other hand, the low temperature heat exchange container 100 is preferably made of a pressurized injection device 110, a low temperature sludge transport device 130, and a discharge device 150.

The pressure injection device 110 includes injection means for preventing the suction pressure is generated in the sludge, and the pressure means 113 for pressing the sludge via the injection means.

Referring to FIG. 5, the injection means includes a case 111 having an inlet 111b for allowing the sludge to flow downward by its own load and an outlet 111a for discharging the sludge, and inside the case 111. It is installed in, and coupled to each other and rotates to include a pair of rotating body 112 for pushing the sludge introduced from the inlet in the direction of the outlet (111a).

Here, since the inlet 111b is wide, even the low-temperature sludge having poor fluidity, the sludge has a greater force than the sludge's own resistance. As a result, even low temperature sludge having poor fluidity is moved downward by the self load of the sludge.

The rotating body 112 may be provided to form a pair in the horizontal direction, it is preferable that each of the rotating body 112 is geared to each other so as to rotate in the inner center direction of the case (111). To this end, the rotating body 112 may be a gear that meshes with each other. The rotating body 112 may be made of a rubber material having a high elastic force so that the low temperature sludge can move more smoothly.

Preferably, the pressing means 113 is provided below the injection means, and the pressing means 113 may be a rotary gear pump capable of fluidizing sludge at a high pressure of 20 atm or more. The rotary gear pump may receive power by the first driving motor 115, and the driving shaft of the rotating body 112 is connected to the driving shaft of the rotary gear pump by a power transmission member such as a chain or a belt. The rotating body 112 can also be rotated.

Here, the upper portion of the pressing means 113 is preferably connected to the lower side of the outlet (111a), one side of the pressing means 113 may be provided with a pressurized discharge portion (113a). Accordingly, the sludge discharged from the organic sludge reservoir may be supplied to the inside of the low temperature heat exchange container 100 by the pressure injection device 110.

As a result, the suction pressure is not generated in the process of injecting low-temperature sludge having poor fluidity by the injection means, so that the low-temperature sludge can be smoothly and easily injected in one direction by the pressing means 113. do.

On the other hand, the low temperature sludge conveying apparatus 130 to transport the sludge in one direction so that the low temperature sludge injected through the pressure injection device 110 can be mixed with the high temperature water vapor, the pressure injection device 110 It is preferred that the distribution device 120 is interposed between the low temperature sludge conveying apparatus 130 and.

Here, the dispensing device 120 is the first inlet to be distributed to the cold sludge transport apparatus 130 in order to transport the cold sludge injected through the pressure injection device 110 to be mixed with the water vapor well ( The communication tube 121 formed in communication with the 101 and the low temperature sludge introduced through the communication tube 121 may include a distribution container 122 corresponding to an internal space of the low temperature heat exchange container 100.

At this time, the distribution container 122 is preferably provided in a cylindrical shape, the distribution hole 123 is circumferentially on the bottom surface so that the cold sludge can be distributed with a constant amount and speed toward the low temperature sludge conveying apparatus 130 It is preferable that a plurality is provided along the direction.

In addition, the dispensing device 120 is engaged with the worm wheel gear 124 and the worm wheel gear 124 in close contact with the outer circumferential surface of the communication tube 121 so that the dispensing container 122 can be rotated in the circumferential direction. It comprises a worm gear 125 and a drive motor 127 for transmitting a driving force to the worm gear 125.

As described above, the cold sludge injected through the first injection hole 101 by the pressure injection device 110 is uniformly dispersed in the internal space of the low temperature heat exchange container 100 through the distribution container 122, It can be smoothly distributed to the cold sludge transport apparatus 130 side.

On the other hand, the low temperature sludge conveying apparatus 130 is a rotary shaft 131 for stirring the low temperature sludge transported to heat the low temperature sludge by condensation heat while condensing by contact with the surface of the low temperature sludge injected into the low temperature heat exchange container 100 ), The first rotating body 132, and the second rotating body 136 are preferably included.

Here, the first rotating body 132 is fixed to the inner surface of the low temperature heat exchange container 100, the first pedestal 134b having a first discharge port 134a is formed in the center and the upper surface of the first pedestal 134b It is installed to be rotatable in the first discharge port 134a to include a first rotary blade 133 formed in the clockwise direction to draw the cold sludge toward the side.

In addition, the second rotating body 136 is fixed to the inner surface of the low temperature heat exchange container 100 and the second pedestal 138b having a second discharge port 138a formed on the outer portion of the second pedestal 138b. It is installed to be rotatable on the upper surface and comprises a second rotary blade 137 is formed in the wing direction counterclockwise to push the low temperature sludge to the second discharge port (138a).

In this case, when the first rotary blade 133 and the second rotary blade 137 are rotated together with the rotary shaft 131 connected to the lower portion of the distribution container 122, the first rotation placed on the first pedestal 134b. The blade 133 draws sludge and drops it into the second pedestal 138b underlying through the first discharge port 134a, and the second rotary blade 137 passes it through the second discharge port 138a. The first rotating body 132 may be dropped onto another first pedestal 134b below and the cold sludge may be smoothly brought into contact with water vapor while being transported downward by gravity while being heated downward. ) And the second rotating body 136 are alternately provided in the longitudinal direction of the rotating shaft 131 is provided with a plurality.

At this time, the lower end of the rotary shaft 131 is bearing-coupled to the support rib 139 formed in the lower inner space of the low temperature heat exchange container 100 to be rotatable.

In addition, the rotation shaft 131 is rotated by the drive motor 127 of the distribution device 120.

As described above, the first rotating body 132 and the second rotating body 136 are each of the plurality of first rotary blades 133 and the first so that the low-temperature sludge to be transported in smooth contact with the water vapor and agitated. It has two rotary blades (137).

Therefore, the low temperature sludge distributed through the distribution apparatus 120 through the low temperature sludge conveying apparatus 130 contacts with the water vapor generated by steam blasting of the high temperature sludge of the high temperature heat exchange vessel 300 and heated by condensation of water vapor. At the same time, it can be agitated in one direction and smoothly transferred.

At this time, the water vapor condensed in contact with the low temperature sludge is supplied to the water vapor generated by evaporation from the high temperature sludge injected into the high temperature heat exchange vessel 300, and is balanced with each other to maintain a constant water vapor pressure so that the high temperature sludge is cooled and the low temperature sludge The steam heat exchange which is heated continues.

On the other hand, the discharge device 150 is connected to the lower portion of the low temperature sludge transport apparatus 130, the suction pressure is not generated in the sludge so that the low temperature sludge with a high vapor pressure is elevated to the first discharge port 109 side smoothly discharged And a rotary gear pump 155 for discharging the sludge injected through the rotary body 151 to the first outlet 109 by applying a high pressure to the rotary body 151 for feeding in one direction.

In this case, the first outlet 109 is preferably formed of a pipe having a predetermined length connected to the outlet of the rotary gear pump 155.

In addition, the discharge device 150 preferably comprises a drive motor 157 for transmitting a driving force to the rotating body 151 and the rotary gear pump 155, the drive motor 157 is the rotary gear A drive shaft may be connected to the impeller of the pump 155, and the drive shaft of the rotary gear pump 155 and the drive shaft of the rotating body 151 may be connected in a chain, belt, or the like configuration.

Therefore, the rotary gear pump 155 and the rotating body 151 may be driven by one drive motor 157.

In addition, the rotating body 151 is preferably provided with a pair of gears engaged with each other, wherein each gear has a plurality of gears in the circumferential direction, such as the rotating body 111 of the pressure injection device 110. It is preferably provided with a gear.

In addition, the rotating body 151 is provided with a gear having a plurality of teeth in the circumferential direction, it may be provided with a pair of interlocking gear having a gear having three smooth curves when viewed from the front.

Looking at the flow of cold sludge in the low temperature heat exchange vessel 100 as described above, the cold sludge is injected through the first inlet 101 by the pressure injection device 110, after the cold sludge is the distribution device It is distributed through the 120 and is stirred and conveyed through the low temperature sludge conveying apparatus 130, is heated by contact with water vapor condensation is discharged to the first outlet 109 through the discharge device 150.

In conclusion, the high temperature sludge is cooled and the low temperature sludge is heated by a high temperature sludge injected into the high temperature heat exchange vessel 300 and a low temperature sludge injected into the low temperature heat exchange vessel 100 as a heat transfer medium.

On the other hand, the steam heat exchange unit 400 according to the present invention as described above can be used to be arranged so that a plurality of heat exchange units are connected in series to increase the thermal efficiency by making the heat exchange temperature in several stages in the sludge treatment apparatus.

Of course, the steam heat exchange unit 400 is disposed so that a plurality in series in the sludge treatment apparatus, it can be used in a variety of spatial directions, such as horizontal direction and vertical direction.

Here, a plurality of steam heat exchange unit 400 is disposed on a predetermined mounting table, it is preferable that the low temperature heat exchange container 100 of each steam heat exchange unit 400 is connected through a predetermined pipe.

Of course, the high temperature heat exchanger container 100 of each of the steam heat exchange unit 400 is also preferably interconnected through a predetermined pipe.

In addition, the low temperature sludge heated by heat exchange with steam of the hot sludge through the plurality of steam heat exchange unit 400 is finally heated and hydrolyzed through the heating unit (550 of FIG. 6).

As described above, by arranging a plurality of steam heat exchange unit 400 in series, the heat exchange of the hot sludge and the cold sludge can be repeated, thus heating unit for heating and hydrolyzing the cold sludge (550 of FIG. 6). ), It is possible to significantly reduce the supply of thermal energy required for hydrolysis of the cold sludge supplied from the steam heat exchange unit.

Figure 6 is a block diagram showing the overall configuration of the sludge hydrolysis apparatus using a steam heat exchange unit according to the present invention.

The sludge hydrolysis apparatus includes a sludge heating unit 550, a steam heat exchange unit 400, and a contact heat exchange unit 530. Here, it is preferable that heat exchange is performed between the low temperature sludge and the hydrolyzed high temperature sludge in the steam heat exchange unit 400 and the heat exchanger below 100 ° C. in the contact type heat exchange unit 530. .

The heating unit 550 hydrolyzes and discharges the low temperature sludge injected from the low temperature heat exchange vessel 100 of the steam type heat exchange unit 400 by the steam supplied from the boiler 560 to discharge the high temperature sludge.

In addition, the steam heat exchange unit 400 includes a low temperature heat exchange vessel 100 and a high temperature heat exchange vessel 300. At this time, the hot sludge discharged from the heating unit 550 is injected into the high temperature heat exchange vessel 300.

Thereafter, hot steam is generated in the hot sludge by the pressure difference in the vessel and the vapor pressure of the injected hot sludge. At this time, since the steam is generated in the hot sludge, the hot sludge is cooled due to the heat of vaporization of the steam.

The water vapor is condensed by contacting the cold sludge injected into the low temperature heat exchange vessel 100 after moving from the high temperature heat exchange vessel 300 toward the low temperature heat exchange vessel 100, and is generated due to the condensation of the water vapor. The low temperature sludge is heated by the heat of condensation. At this time, the low temperature sludge injected into the low temperature heat exchange vessel is supplied from the contact type heat exchange unit 530. Since the low temperature sludge has poor fluidity, the low temperature sludge is pressurized by the second pressure injection device 110 and injected into the low temperature heat exchange container 100.

On the other hand, the contact heat exchange unit 530 is a low temperature sludge is injected from the organic sludge tank 510, and the injected low temperature sludge primarily performs contact heat exchange with the hot sludge injected from the high temperature heat exchange vessel 300. . Specifically, the contact heat exchange unit 530 is to exchange heat between the low temperature sludge and the high temperature sludge by contacting the low temperature sludge to the outer surface of the high temperature sludge pipe 531 to move the high temperature sludge. Even at this time, since the low temperature sludge has poor fluidity, the low temperature sludge is supplied to the contact heat exchange unit by the first press injection device 520.

The low temperature sludge heated through the contact heat exchanger is injected into the low temperature heat exchange vessel 100 of the steam heat exchange unit 400, and then exchanges heat with the high temperature sludge injected into the high temperature heat exchange vessel 300. Thereafter, the cold sludge heated up through the steam heat exchanger is injected into the sludge heating unit 550 to be heated and hydrolyzed. At this time, similarly, the heated low temperature sludge is supplied to the heating unit 550 by the third pressure injection device 540.

As described above, the steam heat exchange unit 400 is provided between the sludge heating unit 550 and the contact heat exchange unit 530, and a plurality of steam heat exchange units 400 may be connected in series to increase the heat exchange efficiency between the low temperature sludge and the high temperature sludge. Can be. Similarly, a plurality of the contact heat exchange unit 530 may be connected in series.

Since each heat exchange unit is arranged in series, the heat exchange between the hot sludge and the cold sludge may be repeated several times to maximize the reuse of thermal energy, thereby efficiently increasing the temperature of the cold sludge.

Meanwhile, the sludge passed through the high temperature heat exchange vessel 300 and the contact heat exchange unit 530 from the sludge heating unit 550 is moved to the solid-liquid separator 570 to be separated into a solid and an aqueous solution.

In addition, the solid precipitated through the solid-liquid separator 570 is moved to the dehydrator 580, the aqueous solution is discharged. At this time, the dehydrator 580 dehydrates the introduced solids, the dehydrated solids are moved to the solid fuel storage tank 590, and the dewatered aqueous solution is discharged.

Meanwhile, a method of mutual heat exchange between low temperature sludge and high temperature sludge in the steam heat exchange unit described with reference to FIGS. 1 to 5 will be described below, and reference numerals of the components will be described with reference to FIGS. 1 to 5.

Sludge heat exchange method using the steam heat exchange unit 400 according to a preferred embodiment of the present invention, first, in the control of the high temperature sludge injection apparatus 310 in the high temperature heat exchange vessel 300 in communication with the low temperature heat exchange vessel 100. Hot sludge is injected by this.

As described above, the injected hot sludge is cooled while generating hot steam by a difference in vapor pressure in an equilibrium state on a vapor pressure curve of water, which changes into gas and liquid according to temperature and pressure.

In detail, when the hot sludge is injected through the control of the hot sludge injecting apparatus 310, high temperature water vapor is generated by the difference between the pressure in the high temperature heat exchange container 300 and the vapor pressure of the injected high temperature sludge, and the high temperature sludge is generated steam. Vaporized heat energy corresponding to the cooling is lost and the water vapor generated in the high temperature heat exchange vessel 300 is supplied to the low temperature heat exchange vessel 100 communicated through the communication unit 200.

Low temperature sludge is injected through the pressure injection device 110 in the low temperature heat exchanger ware 100, and the low temperature sludge is transported in one direction while stirring by the low temperature sludge transport apparatus 130.

At this time, the low temperature sludge conveying apparatus 130 transfers in one direction to pass through the steam while stirring the low temperature sludge evenly distributed in the circumferential direction through the distribution device 120 via the pressure injection device (110).

At this time, when the high temperature water vapor generated in the high temperature heat exchange vessel and placed in pressure equilibrium with the temperature of the vapor pressure curve contacts the low temperature sludge, it rapidly condenses and transfers liquefied thermal energy to raise the low temperature sludge.

By using the steam heat exchange unit 400 as described above, the hot sludge injected into the high temperature heat exchange vessel 300 and the low temperature sludge injected into the low temperature heat exchange vessel 100 by a heat exchange method through the movement of steam. The hot sludge is cooled in the liver, and the low temperature sludge may be heated smoothly.

Figure 7 is a cross-sectional view showing another embodiment of the steam heat exchange unit according to the present invention, Figure 8 is an exploded perspective view showing the hot sludge injection means provided in the high temperature side heat exchange vessel of the steam heat exchange unit of FIG.

9 is a cross-sectional view showing that the hot sludge injection means of FIG. 8 is installed in the steam heat exchange unit, and FIG. 10 is an exploded perspective view showing the cold sludge moving means provided in the low temperature side heat exchange vessel of the steam heat exchange unit of FIG. 7.

As shown in FIG. 7, the steam heat exchange unit 30 injects a predetermined amount of hot sludge into the sealed space while maintaining a high pressure state of the heat exchange container 31a having a sealed space therein and the high temperature organic sludge. Injection means 40 and moving means 45 for heating while moving the low temperature sludge in the heat exchange vessel 31a.

The inside of the heat exchange vessel 31a forms a sealed space filled with water vapor. The heat exchange vessel 31a includes a first injection portion 32a into which high temperature organic sludge is injected, a first discharge portion 33a from which high temperature organic sludge is discharged, and a second injection portion into which low temperature organic sludge is injected. 34a and the 2nd discharge part 35a through which low temperature organic sludge is discharged | emitted.

The first injection part 32a is connected to the sludge discharge pipe of the heating unit or to the first discharge part (not shown) of one of the heat exchange vessels of the steam heat exchange unit having a plurality of other arrangements. The injection means 40 is installed in the first injection part 31a, and the injection means 40 injects a high temperature organic sludge into the heat exchange container 31a at predetermined time intervals while maintaining a pressure difference. .

Therefore, the high temperature sludge injected through the injection means 40 is injected into the closed space and cooled by steam blasting at a pressure difference to generate water vapor. The sludge cooled by steam blasting is freely dropped to free the first discharge part 33a. Is moved to).

The injection means 40 maintains the high pressure of the hydrolyzed organic sludge and a predetermined amount of hydrolyzed organic sludge at predetermined time intervals inside the heat exchange vessel 31a while maintaining the pressure inside the heat exchange vessel 31a. The injection causes the injected hydrolyzed organic sludge to be blasted by volume expansion due to rapid pressure change.

As shown in Figure 7 and 8, the injection means 40 is a cylindrical case 41, a rotating portion 42 rotatably installed in the cylindrical case 41, the upper portion covering the upper surface of the rotating portion 42 A cover 43 and a lower cover 44 covering the lower surface of the rotating part 42 are included.

The rotating part 42 is formed by passing a plurality of storage holes 42a in the longitudinal direction. The rotating part 42 is rotated by the rotation motor 42b to predetermined R.P.M.

The upper cover 43 is installed on the cylindrical case 41 to cover the upper surface of the rotating part 42. The upper cover 43 is formed with a first through hole 43a corresponding to any one of the storage holes 42a. Preferably, the first through hole 43a is bent to have the same curvature as the outer circumference of the rotating part 42 and is formed long. This is to allow sufficient time for the hydrolyzed hot sludge to flow into the storage hole 42a.

The lower cover 44 is installed in the cylindrical case 41 to cover the lower surface of the rotating part 42. The lower cover 44 has a second through hole 44a corresponding to any one of the remaining storage holes 42a except for the storage hole 42a corresponding to the first through hole 43a. Preferably, the second through hole 44a is bent to have the same curvature as the outer circumference of the rotating part 42 and is formed long. This is to allow sufficient time for the hydrolyzed hot sludge stored in the storage hole 42a to be discharged into the sealed space.

When the rotating part 42 rotates so that the storage hole 42a and the first through hole 43a communicate with each other, hydrolyzed high temperature organic sludge having good fluidity flows into the storage hole 42a, and the storage hole 42a is provided. Hydrolyzed organic sludge introduced into the discharged water is discharged into the closed space when the storage hole 42a and the second through hole 44a communicate with each other.

Since the closed space has a relatively low temperature and pressure compared to the heating container (not shown) and the sludge discharge pipe (not shown), the organic sludge hydrolyzed by the pressure difference explodes to generate water vapor. The water vapor generated when the hydrolyzed organic sludge is exploded fills the inside of the heat exchange vessel 31a, that is, the sealed space. The steam heats the low temperature organic sludge injected through the second injection portion 34a. That is, since the low temperature organic sludge has a lower temperature than the sealed space, the surrounding water vapor condenses on the low temperature organic sludge, and the low temperature organic sludge is heated by the heat of condensation generated in the condensation process.

At this time, when the same amount of hot sludge and low temperature sludge are injected at the same rate to each other at the same rate, the vaporization and condensation of water vapor occurs constantly at the intermediate temperature between the high temperature and the low temperature, and the thermal equilibrium state in which the steam pressure is maintained at a constant heat exchange temperature. Becomes On the other hand, the equilibrium temperature may be changed by spraying the cooling water or injecting the steam by installing a spray for cooling water or a steam injection member in the heat exchange vessel 31a.

The first discharge part 33a discharges the steam-blasted hot sludge to another heat exchanger container 31a or a contact heat exchanger unit (not shown). Accordingly, the first discharge part 33a is connected to a first injection part (not shown) of another heat exchanger container (not shown) or to a discharge pump (not shown). The first discharge part 33a is preferably installed below the first injection part 32a so as to freely drop and discharge the hydrolyzed high temperature and high pressure sludge having good flow-exploded fluidity.

The second injection portion 34a is connected to a contact heat exchange unit (not shown) or to a second discharge portion (not shown) of another heat exchange vessel (not shown). Low temperature sludge is injected into the heat exchange vessel 31a, that is, into the sealed space through the second injection portion 34a. The cold sludge injected into the closed space is transferred to the second discharge part 35a by the moving means 45.

Since the low temperature sludge injected into the sealed space is lower than the sealed space, the surrounding water vapor condenses during the movement process, and is heated by the heat of condensation generated in the condensation process.

The heated low temperature sludge is discharged through the second discharge part 35a. The second discharge part 35a discharges the sludge conveyed by the moving means 45 to a heating container (not shown) or to a second injection part (not shown) of another heat exchanger container (not shown).

The moving means 45 has a first discharge part 33a in a state where the high temperature organic sludge injected through the first injection part 32a and the low temperature organic sludge injected through the second injection part 34a are not mixed with each other. ) And the low temperature organic sludge is heated while being moved to the second discharge part 35a.

10 is an exploded perspective view showing a moving means provided in the steam heat exchange unit of FIG.

Referring to FIG. 10, preferably, the moving unit 45 is formed by alternately repeatedly stacking the first and second rotating bodies 46 and 48 so that low temperature organic sludge can be easily mixed with water vapor. .

The moving means 45 has a sufficient free space to be mixed with the low temperature organic sludge and water vapor, and the organic sludge is well stirred in the process of moving the low temperature organic sludge and mixed with the high temperature water vapor so as to vapor on the surface of the low temperature organic sludge. Is contacted and condensed to heat the organic sludge.

The first rotating body 46 is rotatably installed on the upper surface of the first pedestal 46b and the first pedestal 46b having the first discharge port 46a formed outward from the center of the first discharge port 46a. It includes a first rotary blade portion 46c formed to push the organic sludge of.

The second rotating body 48 is installed so as to be rotatable on the upper surface of the second pedestal 48b and the second pedestal 48b having the second discharge port 48a formed therein from the center thereof, so that the second discharge hole 48a is low temperature. And a second rotary blade portion 48c formed to attract organic sludge.

The first rotary blade portion 46c and the second rotary blade portion 48c are rotated by the shaft 49 and the rotary motor 47 for rotating the shaft 49.

The low temperature organic sludge dropped on the first pedestal 46b through the second injection portion 34a is moved to the first discharge port 46a by the first rotary blade 46c and then the second pedestal 48b below. The low temperature organic sludge falling on the second pedestal 48b is moved to the second discharge port 48a by the second rotary blade 48c and then falls to the first pedestal 46b below. Repeating this process, the low temperature organic sludge is stirred and mixed with the water vapor so as to be in good contact with the water vapor. The low temperature organic sludge mixed in this way is heated by the heat of condensation of steam produced by steam blasting.

The low temperature organic sludge stirred and heated while passing through the moving means 45 is discharged through the second discharge part 35a.

In addition, the present invention is not limited to the above-described embodiment, wherein the low temperature sludge transport apparatus has one end installed at a position corresponding to the inlet of the low temperature heat exchanger container, and the other end is discharged from the low temperature heat exchanger container. It may include a conveyor belt installed at a corresponding position.

As the cold sludge is transported on the conveyor belt, it comes into contact with the water vapor generated from the hot sludge. At this time, the water vapor in contact with the cold sludge is condensed, the temperature of the cold sludge is increased due to the condensation of the water vapor. As a result, the hot sludge is deprived of heat of vaporization due to the generation of water vapor and cooled, and the cold sludge is heated by the heat of condensation of steam.

Although specific embodiments of the present invention have been described in detail above, the present invention is not limited thereto, and the present invention includes various modifications without departing from the technical spirit of the above-described embodiments.

1 is a perspective view showing a steam heat exchange unit according to the present invention.

Figure 2 is a cross-sectional view showing the internal structure of the steam heat exchange unit according to the present invention.

Figure 3 is an exploded perspective view showing the first and second rotating body of the main portion of the transfer apparatus in the low temperature heat exchange vessel of the steam heat exchange unit according to the present invention.

Figure 4 is a partial cutaway perspective view showing a hot sludge injection device that is the main portion of the high temperature heat exchange vessel in the steam heat exchange unit according to the present invention.

5 is a partial cutaway perspective view showing a pressure injection device that is a main portion of a low temperature heat exchanger container in the steam heat exchange unit according to the present invention.

Figure 6 is a block diagram showing the overall configuration of the sludge treatment apparatus using a steam heat exchange unit according to the present invention.

7 is a cross-sectional view showing another embodiment of the steam heat exchange unit according to the present invention.

8 is an exploded perspective view showing the injection means provided in the steam heat exchange unit of FIG.

9 is a sectional view showing that the injection means of Figure 8 is installed in the steam heat exchange unit.

10 is an exploded perspective view showing a moving means provided in the steam heat exchange unit of FIG.

<Description of Symbols for Main Parts of Drawing>

100, 521: low temperature heat exchange vessel 110: injection device

120: distribution device 130: transfer device

150: discharge apparatus 300, 523: high temperature heat exchange vessel

310: hot sludge injection device 330: hot sludge discharge device

400, 520: steam heat exchange unit

Claims (18)

In the hot sludge injected from the sludge heating unit, the hot sludge is cooled and discharged while generating steam due to the difference between the internal pressure of the high temperature heat exchange vessel and the pressure of the high temperature sludge having an internal pressure lower than that of the high temperature sludge. High temperature heat exchanger; A low temperature heat exchange container contacting the water vapor while the low temperature sludge injected from the outside or the previous step is moved, and being heated by the condensation of the water vapor and discharged; And, And a communication unit providing a passage through which the steam can move from the high temperature heat exchange vessel to the low temperature heat exchange vessel. The method of claim 1, A high temperature sludge injector installed in the inlet of the high temperature heat exchanger container to inject hot sludge into the high temperature heat exchanger container; And, And a hot sludge discharge device installed at a discharge portion of the hot heat exchange vessel and discharging hot sludge separated from the steam. The method of claim 2, A pressure sensor installed in the high temperature heat exchange vessel to measure an internal pressure of the high temperature heat exchange vessel; And, And a water level sensor installed in the high temperature heat exchange vessel and measuring a level of sludge in the high temperature heat exchange vessel. The method of claim 3, The hot sludge injecting apparatus is controlled to maintain a constant pressure in the high temperature heat exchange vessel based on the measured value of the pressure sensor, and the sludge level inside the high temperature heat exchange vessel is constant based on the measured value of the water level sensor. And a control device for controlling the hot sludge discharge device to be maintained. The method of claim 1, And a low temperature sludge conveying apparatus for transferring the low temperature sludge injected into the inlet of the low temperature heat exchange vessel to the discharge portion of the low temperature heat exchange vessel. The method of claim 5, The low temperature sludge transport apparatus One end is installed at a position corresponding to the inlet of the low temperature heat exchange container, the other end comprises a conveyor belt is installed at a position corresponding to the discharge portion of the low temperature heat exchange container. The method of claim 5, The low temperature sludge transport apparatus A first rotating body for transferring the low temperature sludge downward while pushing the low temperature sludge in an inner wall direction of the low temperature heat exchange container; A second rotating body transferring the low temperature sludge downward while drawing the low temperature sludge toward the center of the low temperature heat exchange vessel; And, A steam heat exchange unit comprising a rotating shaft for rotating the first rotating body and the second rotating body. The method of claim 7, wherein And a distribution device installed in the inlet of the low temperature heat exchanger container to distribute and supply the injected low temperature sludge to the upper portion of the low temperature sludge conveying apparatus. The method of claim 8, The distribution device A fixed injection tube installed through an upper portion of the low temperature heat exchanger container and into which low temperature sludge is injected;  An injection tank communicating with the fixed injection pipe and rotating; A connection device for connecting the fixed injection pipe and the injection tank; And a nozzle spaced apart from a central axis of the injection tank and installed at a position corresponding to an upper portion of the cold sludge conveying apparatus. The method of claim 1, Further comprising a pressurized injection device which is installed on both sides or one side of the low temperature heat exchanger container and the injection means for preventing the suction pressure generated in the cold sludge, and the pressurizing means for pressurizing the cold sludge via the injection means. Type heat exchange unit. The method of claim 10, The injection means A case having an inlet through which the cold sludge flows downward by its own load and an outlet 111a through which the cold sludge is discharged; The steam heat exchange unit is installed in the case, and includes a pair of rotors that are coupled to each other and rotates to push the cold sludge introduced from the inlet in the direction of the outlet (111a). The method of claim 2, The high temperature sludge injection device A rotating part formed by passing a plurality of storage holes in the longitudinal direction; An upper cover installed at an upper portion of the rotating part and having a first through hole corresponding to any one of the storage holes; And, A steam heat exchange unit is installed below the rotating part and includes a lower cover having a second through hole corresponding to any one of the other storage holes except for the storage hole corresponding to the first through hole.        The method of claim 2, The hot sludge injection device and the hot sludge discharge device include a valve for adjusting the cross-sectional area of the passage for adjusting the pressure and flow rate of the injected and discharged hot sludge, and a steam exchanger including an adjustment part for controlling the opening and closing of the valve. Unit. The steam heat exchange unit according to any one of claims 1 to 13, wherein the steam heat exchange unit is two or more. The method of claim 14, Steam heat exchange unit in which the pressure and temperature of the internal steam of each steam heat exchange unit are gradually adjusted down A heating unit in which the cold sludge is hydrolyzed at high temperature by the supplied steam to be discharged as hot sludge; Steam heat exchange unit according to any one of claims 1 to 13; And And a contact heat exchange unit contacting the outer surface of the high temperature sludge tube through which the high temperature sludge discharged from the steam heat exchange unit moves to exchange heat with each other. A heating unit in which the cold sludge is hydrolyzed at high temperature by the supplied steam to be discharged as hot sludge; A steam heat exchange unit in which the pressure and temperature of the internal steam of each steam heat exchange unit according to claim 14 are gradually adjusted downward; And And a contact heat exchange unit contacting the outer surface of the high temperature sludge tube through which the high temperature sludge discharged from the steam heat exchange unit moves to exchange heat with each other. Hot sludge is introduced into a high temperature heat exchange vessel having an internal pressure lower than that of the hot sludge; Introducing a low temperature sludge into the low temperature heat exchange vessel; Steam is generated due to the pressure change of the hot sludge to cool the hot sludge; And, And steaming the low temperature sludge while condensing the water vapor with the low temperature sludge.

Images