JP2007181759A - Method and device for thermally decomposing water-containing sludge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for thermally decomposing water-containing sludge which is simple in structure, can significantly reduce a running cost, and enables thermal decomposition and sterilization of the water-containing sludge simultaneously; and a device. <P>SOLUTION: The device comprises a thermal decomposition furnace 1 having a sludge accommodation chamber 2 for accommodating the water-containing sludge inside and providing a heating passage 3 for passing a heating medium on the outer periphery of the sludge accommodation chamber 2, an agitation means installed in the sludge accommodation chamber 2 and having a blade 14 for agitating the water-containing sludge, a compressor 16 for compressing steam generated in the sludge accommodation chamber 2 to increase temperature and feeding it in the heating passage 3 of the thermal decomposition furnace 1 as the heating medium, a heating means 22 for feeding the heating medium heated by a heat source other than a heat source generated by the compressor 16, into the heating passage 3 and a controller for controlling the whole device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for thermally decomposing hydrous sludge, which comprises heat-drying and sterilizing hydrous sludge generated in an agricultural processing factory.

  In recent years, awareness of environmental issues has improved, and the need for sludge recycling has increased. As a method for recycling sludge, microorganisms are put in the sludge, and organic substances are decomposed by the microorganisms to convert them into compost, which is used as a plant fertilizer. As has been described, a method has been developed in which sludge is thermally decomposed and used as fuel.

  However, the method of treating mainly microbial treatment has a problem of generating a foul odor when deposited because the free soil of root vegetables contains organic matter. Moreover, since it contains a pathogenic virus, it cannot be returned to the field, and subsequent disposal is a problem.

In the sewage sludge treatment system described in Patent Document 1, first, water-containing sludge is dehydrated by a centrifugal dryer, and then put into a thermal decomposition furnace, thermally decomposed, and dried sludge is used as a boiler as fuel. The heat generated by the combustion is used as a heat source for the thermal cracking furnace, and this heat source is used to produce electricity and cold / hot water. In this treatment method, no malodor is generated, and the pathogenic virus can be killed and sterilized at the time of heating.
Japanese Patent Laid-Open No. 11-5100

  However, the thermal decomposition method described in Patent Document 1 uses a boiler as a heat source, and uses a method of returning the heat-dried sludge to the boiler again as fuel, so the structure is complicated and the price of the apparatus The cost is high and maintenance is troublesome. For this reason, initial and running costs are expensive, and the current situation is that they are not widely used. Accordingly, there is a need for a hydrolytic sludge thermal decomposition apparatus that is easy to handle and has low running costs and the like.

  The present invention has been made to solve the conventional problems as described above, has a simple structure, can greatly reduce the running cost, and can thermally decompose and sterilize hydrous sludge. An object of the present invention is to provide a method and an apparatus for thermal decomposition treatment of hydrous sludge that can be performed simultaneously.

According to the present invention, the above problem is solved as follows.
(1) In the thermal decomposition treatment method of hydrous sludge, the water vapor generated by heating the hydrous sludge is compressed and heated by a compressor and used as a heat source for heating the hydrous sludge.

(2) By heating the water-containing sludge, water is separated and removed, and in the water-containing sludge pyrolysis treatment apparatus that generates dry sludge, the steam generated from the water-containing sludge is heated by the compressor. The water-containing sludge is compressed and heated to be used as a heat source for heating.

(3) A hydrous sludge thermal decomposition apparatus that separates and removes moisture by heating hydrous sludge to produce dry sludge, and has a sludge storage chamber for containing hydrous sludge inside, and A pyrolysis furnace having a heating passage through which a heating medium for heating the entire sludge storage chamber and heating the water-containing sludge in the sludge storage chamber is provided on the outer periphery of the sludge storage chamber, and rotating in the sludge storage chamber. , A stirring means having a blade for stirring the water-containing sludge contained in the sludge storage chamber, and steam generated from the water-containing sludge in the sludge storage chamber is compressed and heated to heat the heating cracking furnace as a heating medium A compressor to be sent into the passage, and a heating means for sending a heating medium heated by a heat source different from the heat source generated by the compressor into the heating passage when the temperature in the sludge storage chamber is lower than a predetermined temperature, Control over the entire device It shall comprise a device.

(4) A hydrous sludge thermal decomposition apparatus that separates and removes moisture by heating hydrous sludge to produce dry sludge, and has a sludge storage chamber for containing hydrous sludge inside, and A pyrolysis furnace having a heating passage through which a heating medium for heating the entire sludge storage chamber and warming the water-containing sludge in the sludge storage chamber is provided on the outer periphery of the sludge storage chamber, and rotating in the sludge storage chamber. A stirring means having a blade for stirring the hydrous sludge accommodated in the sludge containing chamber, a heating means for sending a heating medium heated by a heat source into the heating passage, and water vapor generated from the hydrous sludge in the sludge containing chamber, The compressor that generates compressed steam by compressing and raising the temperature, and heat exchange of the compressed steam generated by the compressor with the heating medium in the heating means or the medium before being heated is performed. , The heating medium , Or a heat exchanger so as to transmit before the medium to be heated, it is assumed that a control device for controlling the entire apparatus.

(5) In the above item (4), the compressed steam discharged from the heat exchanger is supplied as a heating medium to a preheating device that preheats the hydrous sludge before being stored in the sludge storage chamber.

(6) In any of the above items (3) to (5), after heating the sludge storage chamber, the heating medium discharged from the thermal decomposition furnace is preheated with the hydrous sludge before being stored in the sludge storage chamber. The preheating device is fed as a heating medium.

(7) In any one of the above items (3) to (6), the heat decomposition furnace is provided with a discharge pump for discharging the fluid in the heating passage.

(8) In any one of the above items (2) to (7), the compressor is provided with intake air amount adjusting means for adjusting the amount of water vapor taken into the compressor.

According to the present invention, the following effects can be achieved.
According to the first and second aspects of the present invention, the steam generated from the water-containing sludge is compressed and heated by a compressor and used as a heat source for heating the water-containing sludge. Energy can be used effectively, and the running cost and fuel cost can be greatly reduced.
In addition, when heat-containing sludge is thermally decomposed, pathogenic virus can be sterilized simultaneously.

According to the third aspect of the present invention, at the start of operation, when the heating means is operated and the heating medium heated thereby is supplied into the heating passage in the thermal decomposition furnace, the water-containing sludge in the sludge containing chamber is warmed, At high temperatures, water vapor is generated from the hydrous sludge. The generated steam is compressed by the compressor and becomes a compressed steam, and the temperature rises at the same time. When the temperature reaches a temperature suitable for heating in the pyrolysis furnace, the compressed steam is used as a heating medium. When supplied into the heating passage in the thermal cracking furnace together with the heating medium from the heating means or by switching alone, the energy of water vapor generated from the water-containing sludge can be used effectively, and the running cost is greatly reduced. In addition, the fuel cost can be reduced.
In addition, when heat-containing sludge is thermally decomposed, pathogenic virus can be sterilized at the same time.

According to the fourth aspect of the present invention, the water vapor generated from the hydrous sludge is compressed by the compressor and not directly supplied into the heating passage in the thermal decomposition furnace, but supplied into the heating passage, or heating. Since heat is exchanged with the medium before being heated, only the energy of the water vapor is converted into a heating medium and supplied into the heating passage, so that the water-containing sludge is the same as in the first aspect of the invention. Thus, it is possible to effectively use the energy of the water vapor generated from the water, and the same effects as in the first aspect of the invention can be achieved.
Moreover, according to the third aspect of the present invention, even if corrosive gas that corrodes the inside of the heating passage and other harmful components are contained in the water vapor generated from the hydrous sludge, they are directly supplied to the heating passage. Therefore, the life of the thermal decomposition furnace can be extended.

  According to the fifth aspect of the present invention, the remaining energy of the compressed steam discharged from the heat exchanger is further used to preheat the water-containing sludge before being put into the sludge containing chamber, so that the running cost is reduced. Further, it can be reduced and the processing time can be shortened.

  According to the invention described in claim 6, after the heating of the sludge storage chamber, the remaining energy of the heating medium discharged from the pyrolysis furnace is further used to preheat the water-containing sludge before being charged into the sludge storage chamber. Thus, the running cost can be further reduced and the processing time can be shortened.

According to the seventh aspect of the present invention, when the pyrolysis furnace is started, the discharge pump is operated to discharge the fluid in the heating passage, thereby depressurizing the sludge storage chamber communicating with the pyrolysis furnace via the compressor. Accordingly, the generation of water vapor from the water-containing sludge accommodated in the sludge accommodation chamber can be promoted, the treatment efficiency can be increased, and the treatment time can be shortened.
In addition, since the heating medium in the heating passage after the heating to the sludge storage chamber can be forcibly discharged out of the heating passage using the discharge pump, the circulation of the heating medium in the heating passage is actively performed, and the sludge storage chamber is Can be heated rapidly.

  According to the eighth aspect of the present invention, the amount of water vapor sucked by the compressor can be adjusted by the intake air amount adjusting means, and the amount of condensed water discharged from the compressor can be controlled and optimized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a first embodiment of a hydrolytic sludge pyrolysis apparatus according to the present invention.

  In FIG. 1, the pyrolysis furnace (1) has a sludge storage chamber (2) inside, and has a double wall structure in which the outer periphery of the sludge storage chamber (2) is covered with a heating passage (3). It is formed as a horizontally long tank. The heating passage (3) is supplied with a heating medium, which will be described later as compressed steam heated to a high temperature, and the heating medium heats the entire outer peripheral surface of the sludge storage chamber (2). (2) The water-containing sludge in the structure is heated. Therefore, the heating passage (3) may be a simple hollow chamber or a pipe shape as long as the heating medium flows. In this example, ribs and warping plates (not shown) facing the axial direction or the circumferential direction are provided in a simple hollow chamber.

  An upward sludge inlet (4) leading to the upper part of the sludge storage chamber (2) is provided at the upper part of one end side (the left end side and the inlet side in FIG. 1) of the pyrolysis furnace (1). A heating medium discharge pipe (5) provided with a discharge pump (6) for discharging the heating medium in the heating passage (3) to the outside is connected to the inner part. The sludge inlet (4) is closed by a lid (4a) except when the hydrous sludge is stored in the sludge storage chamber (2).

In the lower part of the other end side (the right end side and the discharge side in FIG. 1) of the pyrolysis furnace (1), a downward treatment soil discharge port (7) leading to the lower part in the sludge storage chamber (2) is provided. Yes. One end of a water vapor outlet pipe (9) for connecting the inside of the sludge storage chamber (2) and the heating device (8) constituting the heat recovery heat pump is connected to the upper part. The treated soil discharge port (7) is blocked by a lid (7a) except when removing the sludge that has been decomposed in the sludge storage chamber (2).
A drain valve (10) for discharging the condensed water accumulated in the heating passage (3) in a timely manner is provided at the lower center of the pyrolysis furnace (1).

  One end of a heating medium introduction pipe (11) that connects between the heating device (8) and the heating passage (3) is connected to a lower portion on one end side of the pyrolysis furnace (1). In addition, in the upper part of the pyrolysis furnace (1), when the pressure in the heating passage (3) exceeds a predetermined pressure, excessive pressure in the heating passage (3) is automatically released. A safety valve (12) is provided.

  A rotary shaft (13) is rotatably attached to the pyrolysis furnace (1) so as to penetrate the center. A plurality of stirring blades (14) are attached to the rotary shaft (13) located in the sludge storage chamber (2), and at the input end of the thermal cracking furnace (1). Is equipped with a stirring motor (15) for rotating the rotating shaft (13). When the agitation motor (15) is operated, the rotating shaft (13) is rotated together with the agitation blade (14), and the agitation blade (14) causes the sludge contained in the sludge storage chamber (2). It can be stirred.

The heating device (8) has a compressor (16) connected to the other end of the water vapor outlet pipe (9). An intake air amount adjusting means (17) for adjusting the amount of water vapor taken into the compressor (16) is provided at the end of the compressor (16) on the water vapor outlet pipe (9) side. The compressor (16) compresses and heats the steam having a large specific volume, which is generated in the sludge storage chamber (2) and sent through the steam outlet pipe (9), to generate high-temperature compressed steam. Can be supplied to the heating medium introduction pipe (11) as a heating medium.
The intake air amount adjusting means (17) can control the amount of heat generated by the compressor (16) by adjusting the amount by which the compressor (16) sucks water vapor from the sludge storage chamber (2).

  The compressed steam supplied as a heating medium from the compressor (16) into the heating medium introduction pipe (11) flows through the heating passage (3) surrounding the outer periphery of the sludge containing chamber (2), and the sludge containing chamber (2 ) Is then heated and then sent to the preheating device (18) through the heating medium discharge pipe (5) by the operation of the discharge pump (6).

The preheating device (18) has a storage tank (19) for temporarily storing water-containing sludge before being introduced into the sludge storage chamber (2), and the outer periphery of the storage tank (19) is It is covered with a preheating pipe (20) connected to the heating medium discharge pipe (5). Therefore, the water-containing sludge stored in the storage tank (19) is preheated by the heating medium passing through the preheating pipe (20).
The heating medium that has passed through the preheating pipe (20) is collected in the drain tank (21).

  In the heating device (8), the temperature in the sludge storage chamber (2) is insufficient when the device is started, and the sludge storage chamber (2) can be obtained only by the heat of the compressed steam generated by the compressor (16). There is provided a heating means (22) for feeding a heating medium to the heating passage (3) in an auxiliary manner when the water-containing sludge cannot be sufficiently heated. This heating means (22) is a boiler in this example, and heats water by combustion of fuel or an electric heater to generate steam, which is the same as the compressed steam generated by the compressor (16). The pressure can be adjusted to a certain level and supplied to the heating medium introduction pipe (11).

  In addition, a switching valve is provided at a branch portion between the compressor (16) side and the heating means (22) side in the heating medium introduction pipe (11), or the branch portion and the compressor (16) or / and heating means ( 22), a pressure accumulating tank (not shown) may be provided.

  FIG. 2 is a block diagram illustrating a configuration example of a control device in the thermal decomposition processing apparatus illustrated in FIG. 1. This control device has a control unit (23) constituted by a computer. The controller (23) includes a stirring motor drive control circuit (24) for controlling the driving of the stirring motor (15), and a compressor for controlling the driving of the compressor (16) and the intake air amount adjusting means (17). A drive control circuit (25), a discharge pump drive control circuit (26) for controlling the drive of the discharge pump (6), and a heating means control circuit (27) for controlling the drive of the heating means (22) are connected. Yes. And a control part (23) controls the whole apparatus according to the process sequence by the program incorporated previously.

Next, together with the operation and handling of this apparatus, the procedure for carrying out the thermal decomposition treatment method for hydrous sludge according to the present invention will be described.
First, the lid (4a) of the sludge storage chamber (2) is opened, and a predetermined amount of water-containing sludge is introduced into the inside through the sludge inlet (4). It is preferable to use the water-containing sludge that has been preheated at another position. Further, depending on the situation, it is preferable to drive the agitation motor (15) and add the hydrated sludge while agitating the introduced hydrated sludge with the agitation blade (14). After the addition of the hydrous sludge, the lid (4a) is closed and the thermal decomposition process is started.

After closing the lid (4a), the discharge pump (6) is operated to exhaust the air in the heating passage (3), so that the heating medium introduction pipe (11), the compressor (16), the steam outlet pipe The inside of the sludge storage chamber (2) communicated with the heating passage (3) can be vacuum-sucked through (9) or the like, and the reduced pressure state can be maintained.
Thus, by reducing the pressure in the sludge storage chamber (2) at the time of start-up, the generation of water vapor from the water-containing sludge stored in the sludge storage chamber (2) can be promoted, and the processing efficiency can be improved. And the processing time can be shortened.

Next, when the stirring motor (15) is actuated, the stirring blade (14) is rotated, and the water-containing sludge in the sludge storage chamber (2) is stirred.
When the heating means (22) is operated in this state, the compressed steam generated by the heating means (22) passes through the heating medium introduction pipe (11), and the heating passage (3) in the heating cracking furnace (1). And circulates in the heating passage (3) and is then discharged from the heating medium outlet (5). Meanwhile, the inside of the sludge storage chamber (2) is heated from the outside by the heating medium.

  When the entire interior of the sludge storage chamber (2) is warmed, the water-containing sludge stored therein is also heated, and moisture is generated from the water-containing sludge as water vapor. This water vapor is taken into the compressor (16) through the water vapor outlet pipe (9). The compressor (16) compresses and raises the temperature of the taken water vapor to generate high-temperature compressed steam, and supplies this compressed steam as a heating medium into the heating medium introduction pipe (11).

When the amount of compressed steam supplied from the compressor (16) reaches a sufficient value, the operation of the heating means (22) is stopped.
In this state, by simply supplying the operating energy of the compressor (16) from the outside, the energy of water vapor generated from the water-containing sludge is used to heat the water-containing sludge and promote the generation of water vapor from the water-containing sludge. A heat recovery type energy circulation system is formed.

When the temperature in the sludge storage chamber (2) decreases or the water content of the water-containing sludge decreases and the amount of water vapor generated from the sludge storage chamber (2) decreases, the heating means (22) is turned on again. Then, the compressed steam generated from the heating means (22) and the compressed steam generated from the compressor (16) are mixed and supplied to the heating medium introduction pipe (11). Thereby, it is possible to compensate for a decrease in the amount of heat necessary for heating the sludge storage chamber (2).
After the amount of heat necessary for heating the sludge storage chamber (2) is recovered, the operation of the heating means (22) is stopped again.

  This series of operations is repeated several times as necessary, and when the water content of the water-containing sludge in the sludge storage chamber (2) is almost completely separated and removed, and the water-containing sludge is dried, the compressor (16) and the heating means After stopping the operation of (22), the lid (7a) is opened and the dried sludge is discharged from the sludge storage chamber (2). This discharged sludge can be returned to the field as sterile soil or reused as horticultural soil.

Further, when the water-containing sludge to be treated next is stored in the storage tank (19) of the preheating device (18), the water-containing sludge flows from the heating medium discharge pipe (5) to the preheating pipe (20). Preheated by the coming heating medium, the processing time of the next thermal decomposition treatment can be shortened, and the remaining energy of the used heating medium can be effectively used.
The heating medium that has passed through the preheating pipe (20) is collected in the drain tank (21).

With the configuration of the first embodiment, the following effects can be obtained.
(I) The water vapor of the hydrous sludge generated in the sludge storage chamber (2) is compressed and heated by the compressor (16) and converted into high-temperature compressed steam. It is sent into the heating passage (3) of 1) and used for heating the sludge storage chamber (2). Therefore, it is possible to greatly reduce the fuel cost and the running cost.
In addition, when hydrous sludge is pyrolyzed, pathogenic viruses can be sterilized by heat.

(Ii) Since the intake air amount adjusting means (17) for adjusting the amount of water vapor taken into the compressor (16) is provided, the amount of compressed steam generated by the compressor (16) can be easily adjusted. it can.

(Iii) When the pyrolysis furnace (1) is started, the exhaust pump (6) is operated to exhaust the gas in the heating passage (3), so that the pyrolysis furnace ( 1) The sludge storage chamber (2) communicating with 1) can be depressurized, whereby the generation of water vapor from the water-containing sludge stored in the sludge storage chamber (2) can be promoted. Efficiency can be increased and processing time can be shortened.
Further, the heating medium in the heating passage (3) after the heat treatment can be forcibly discharged to the outside of the heating passage (3) by the discharge pump (6). The flow of the heating medium is good, and the sludge storage chamber (2) can be efficiently heated.

(Iv) Not only at the start-up, but also when the temperature in the sludge storage chamber (2) decreases, or when the moisture content of the water-containing sludge decreases and the amount of water vapor generated from the sludge storage chamber (2) decreases. By operating the heating means (22), it is possible to compensate for a reduction in the amount of heat necessary for heating the sludge storage chamber (2).

(V) After the heating of the sludge storage chamber (2), the remaining energy of the heating medium discharged from the pyrolysis furnace (1) is further used to put the water-containing sludge before being put into the sludge storage chamber (2). Is preheated, the running cost can be further reduced and the processing time can be shortened.

  Next, 2nd Example of the thermal decomposition treatment apparatus of the water-containing sludge which concerns on this invention is described with reference to FIG.3 and FIG.4. The structure of the thermal sludge pyrolysis apparatus shown in FIGS. 3 and 4 is obtained by changing a part of the heating device (8) shown in FIGS. Except that the preheating device (18) in the first embodiment is omitted, it is the same as that shown in FIG. 1 and FIG. To do.

As shown in FIG. 3, the heating device (28) includes a compressor (16), a heat exchanger (29), a fan (30), a heating means (31), and the like.
In this heating device (28), the compressed steam that has been compressed and heated by the compressor (16) and heated to a high temperature is sent to the heat exchanger (29), where it is used for combustion by the fan (30). The compressed steam that is heat-exchanged with the combustion air fed to the air supply pipe (32), preheats the combustion air, and is cooled in the heat exchanger (29) passes through the discharge pipe (33). , And sent to the preheating device (34).

The preheating device (34) has a storage tank (35) for temporarily storing hydrous sludge before being put into the sludge storage chamber (2), and the outer periphery of the storage tank (35) is It is covered by a preheating pipe (36) connected to the discharge pipe (33). Accordingly, the water-containing sludge stored in the storage tank (35) is preheated by the compressed steam passing through the preheating pipe (36).
The compressed steam that has passed through the preheating pipe (36) is collected in the drain tank (37).

  In this example, the heating means (31) includes a burner (38) configured to supply combustion gas, which is a heating medium, to the heating medium introduction pipe (11).

  A combustion air supply pipe (32) is connected to the burner (38), through which the combustion air preheated by the heat exchanger (29) is supplied to the burner (38). ing.

  Therefore, in this example, the energy of water vapor generated from the water-containing sludge in the sludge storage chamber (2) is not used directly as a heating medium, but preheats the combustion air supplied to the burner (38). As a result, it is used for heating the combustion gas of the burner (38) as a heating medium.

  FIG. 4 is a block diagram illustrating a configuration example of a control device in the thermal decomposition processing apparatus illustrated in FIG. 3. This control device is almost the same as the configuration shown in FIG. 2, and only the configuration shown in FIG. 2 is that a fan drive control circuit (39) for driving the fan (30) is connected to the control unit (23). Is different.

  Regarding the action, the heating medium supplied to the heating passage (3) is only the combustion gas from the burner (38), and the energy of water vapor generated from the water-containing sludge in the sludge storage chamber (2) is the burner (38). The first implementation except for preheating the combustion air supplied to the tank and preheating the water-containing sludge before being put into the sludge storage chamber (2) in the preheating device (34). Same as example.

  Moreover, regarding the effect, the energy of water vapor generated from the water-containing sludge in the sludge storage chamber (2) can be used for heating the sludge storage chamber (2), greatly reducing running costs and reducing fuel costs. The same effect as in the first embodiment can be achieved in that the reduction can be achieved, and the pathogenic virus can be sterilized at the same time when the hydrous sludge is thermally decomposed.

  In addition, in the second embodiment, even if corrosive gas that corrodes the inside of the heating passage (3) and other harmful components are contained in the water vapor generated from the hydrous sludge, these are directly heated in the heating passage ( Since it is not supplied to 3), it is possible to obtain a specific effect that the life of the thermal cracking furnace (1) can be extended.

  In the second embodiment, the combustion air supplied to the burner (38) is preheated by the energy of water vapor generated from the water-containing sludge in the sludge storage chamber (2), but the fan (30) In the heat exchanger (29), the air fed by the compressor (16) is heated by exchanging heat with the compressed steam that has been compressed and heated by the compressor (16) and heated to a high temperature. The heating medium (3) may be supplied directly or mixed with the combustion gas from the burner (38) or switched.

It is a schematic block diagram which shows 1st Example of the thermal decomposition processing apparatus which concerns on this invention. Similarly, it is a circuit block diagram which shows an example of the control apparatus in 1st Example. It is a schematic block diagram which shows the 2nd Example of the thermal decomposition processing apparatus which concerns on this invention. Similarly, it is a circuit block diagram showing an example of a control system in the second embodiment apparatus.

Explanation of symbols

(1) Thermal decomposition furnace
(2) Sludge storage room
(3) Heating passage
(4) Sludge inlet
(4a) Lid
(5) Heating medium outlet
(6) Discharge pump
(7) Treated soil outlet
(7a) Lid
(8) Heating device
(9) Steam outlet pipe
(10) Drain valve
(11) Heating medium introduction pipe
(12) Safety valve
(13) Rotating shaft
(14) Stirring blade
(15) Stirring motor
(16) Compressor
(17) Intake air volume adjustment means
(18) Preheating device
(19) Reservoir
(20) Preheating tube
(21) Drain tank
(22) Heating means
(23) Control unit (computer)
(24) Stirring motor drive control circuit
(25) Compressor drive control circuit
(26) Discharge pump drive control circuit
(27) Heating means control circuit
(28) Heating device
(29) Heat exchanger
(30) Fan
(31) Heating means
(32) Combustion air supply pipe
(33) Discharge pipe
(34) Preheating device
(35) Reservoir
(36) Preheating tube
(37) Drain tank
(38) Burner
(39) Fan drive control circuit

Claims (8)

  A method for thermally decomposing hydrous sludge, characterized in that the hydrous sludge is used as a heat source for heating the hydrous sludge by compressing and raising the temperature of the generated water vapor by heating the hydrous sludge.   By heating the hydrous sludge, water is separated and removed, and in the hydrolyzed sludge pyrolysis treatment equipment that generates dry sludge, the water vapor generated from the hydrous sludge is compressed and elevated by the compressor. An apparatus for thermal decomposition treatment of hydrous sludge characterized by being heated and used as a heat source for heating the hydrous sludge. In the thermal decomposition treatment equipment of hydrous sludge that separates and removes water by heating the hydrous sludge and generates dry sludge,
Heating that has a sludge storage chamber for storing hydrated sludge inside, and that heats the entire sludge storage chamber on the outer periphery of the sludge storage chamber and passes a heating medium for heating the sewage sludge in the sludge storage chamber A pyrolysis furnace provided with a passage;
A stirring means having a blade that rotates in the sludge storage chamber and stirs the water-containing sludge stored in the sludge storage chamber;
A compressor that compresses and raises the temperature of water vapor generated from the water-containing sludge in the sludge containing chamber, and sends it as a heating medium into the heating passage of the thermal decomposition furnace;
Heating means for sending a heating medium heated by a heat source different from the heat source generated by the compressor into the heating passage when the temperature in the sludge containing chamber is lower than a predetermined temperature;
A hydrolytic sludge pyrolysis apparatus comprising a control device for controlling the entire apparatus. In the thermal decomposition treatment equipment of hydrous sludge that separates and removes water by heating the hydrous sludge and generates dry sludge,
Heating that has a sludge storage chamber for storing hydrated sludge inside, and that heats the entire sludge storage chamber on the outer periphery of the sludge storage chamber and passes a heating medium for heating the sewage sludge in the sludge storage chamber A pyrolysis furnace provided with a passage;
A stirring means having a blade that rotates in the sludge storage chamber and stirs the water-containing sludge stored in the sludge storage chamber;
Heating means for sending a heating medium heated by a heat source into the heating passage;
A compressor that compresses and raises the temperature of water vapor generated from the water-containing sludge in the sludge storage chamber, and generates compressed steam;
Heat exchange of the compressed steam generated by the compressor with the heating medium in the heating means or the medium before being heated to transfer the heat of the compressed steam to the heating medium or the medium before being heated. A heat exchanger
A hydrolytic sludge pyrolysis apparatus comprising a control device for controlling the entire apparatus.   The hydrous sludge according to claim 4, wherein the compressed steam discharged from the heat exchanger is supplied as a heating medium to a preheating device for preheating the hydrous sludge before being accommodated in the sludge containing chamber. Pyrolysis treatment equipment.   After heating the sludge storage chamber, the heating medium discharged from the pyrolysis furnace is supplied as a heating medium to a preheating device that preheats the water-containing sludge before being stored in the sludge storage chamber. The thermal decomposition treatment apparatus for hydrous sludge according to any one of claims 3 to 5.   The apparatus for thermal decomposition treatment of hydrous sludge according to any one of claims 3 to 6, wherein a discharge pump for discharging the fluid in the heating passage is provided in the heat decomposition furnace. The apparatus for thermal decomposition treatment of hydrous sludge according to any one of claims 2 to 7, wherein an intake air amount adjusting means for adjusting the amount of water vapor taken into the compressor is provided in the compressor.

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