JP2006218383A - High water content organic waste treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high water content organic waste treatment system which can perform self-sustaining operation without requiring external energy in processes from drying to burning/exhausting treatment. <P>SOLUTION: The high water content organic waste treatment system comprises: a latent heat recovering vacuum dryer 10 which dries dehydrated cakes 2, which are high water content organic waste, and has a steam compressor 13 for using latent heat of steam generated by drying for heating; an incinerator 21 for burning the dried cakes 3 formed in the latent heat recovering vacuum dryer 10; and a waste heat recovering device 30 comprising a waste heat boiler 31 for generating high-temperature steam by using waste heat from the incinerator 21, and a steam turbine 32 driven by the high-temperature steam from the waste heat boiler 31. The steam compressor 13 is driven by the energy recovered in the waste heat recovering device 30. The latent heat recovering vacuum dryer 10 is further heated by waste heat recovered by a heat exchanger 41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a system for treating high water content organic waste obtained by dewatering organic waste water containing organic sludge, sewage sludge, etc. Specifically, external energy is used to dry high water content organic waste. The present invention relates to a high water content organic waste treatment system that is not required.

  Organic waste obtained by dehydrating organic wastewater containing organic sludge, sewage sludge, etc. is treated by incineration for the purpose of volume reduction, weight reduction, stabilization and detoxification. However, when the organic waste has a high water content (hereinafter, also simply referred to as “high water organic waste”), it cannot be incinerated as it is, so that fossil fuels such as heavy oil and city gas are put into the incinerator. It is necessary to add as auxiliary fuel as appropriate. For this reason, the cost which an incineration process requires becomes large.

  Therefore, for the purpose of reducing the water content of the organic waste to be incinerated and facilitating incineration, preferably the organic waste is self-combusted in an incinerator and becomes a new energy source. Many techniques have been developed to efficiently remove moisture from organic wastewater. Examples of such means for removing moisture (hereinafter also simply referred to as “dehydrating means”) include a filter press type and a screw press type which are mechanical dehydrating means. However, actually, even if dehydration is performed by the dehydration means, the water content of the organic component-containing wastewater cannot be sufficiently reduced, and it is limited to about 80 wt%. Accordingly, organic content-containing wastewater that has been dehydrated and whose water content has been reduced to about 80 wt% (hereinafter, also simply referred to as “dehydrated cake”. In particular, it is also referred to as “high water content organic waste” because of its high water content). I can't even burn.

  Thus, as a known technique for further reducing the moisture content by further drying the dehydrated cake, for example, an incineration system that uses the heat of exhaust gas from an incinerator for drying organic waste (Patent Document 1). Another example is a vapor recompression-type vacuum concentration drying apparatus (Patent Document 2) that utilizes the latent heat of water vapor using a water vapor condenser and is used for drying organic waste.

  Patent Document 1 discloses a waste incineration system that does not require fossil fuel-based auxiliary fuels such as heavy oil and city gas when incinerating high water content organic waste by drying high water content organic waste. The waste incineration system includes a dryer that forms a dried cake by drying a dehydrated cake, an incinerator that incinerates the dried cake, and a heat exchanger that transmits thermal energy generated from the incinerator to the dryer. And an exhaust gas treatment tower for removing acidic components in the exhaust gas, and a heat pump for heating the heat of the waste water from the exhaust gas treatment tower and transmitting it to the dryer.

  Accordingly, the heat energy of the exhaust gas from the incinerator is used in the dryer with the heat exchanger, and the dryer using the heat pump driven by external electric power and the waste water from the exhaust gas treatment tower. To sufficiently dry the dehydrated cake. Therefore, incineration of organic waste does not require an auxiliary fuel such as fossil fuel, and can be self-combusted.

  On the other hand, Patent Document 2 discloses a drying apparatus for high water content waste. The drying device has a tank that contains waste containing high water content, a function of lowering the atmospheric pressure in the tank by discharging air from the tank, and a function of compressing water vapor discharged from the tank under reduced pressure. A compressor, and a steam condenser that is provided in the tank and is thermally coupled to the tank and that condenses the high-temperature and high-pressure steam discharged from the steam compressor to heat the tank. Yes.

  As a result, the atmospheric pressure in the tank is lowered by the water vapor compressor, thereby lowering the boiling point of the water, whereby the water vapor evaporated from the waste becomes a high pressure in the water vapor compressor and is provided in the tank. It flows into the steam condenser. In the water vapor condenser, the water vapor that has flowed in is condensed, that is, condensation heat generated by a gas-liquid phase change is transferred to the waste in the tank, and the waste is heated. Thus, the said drying apparatus is supposed to provide a drying means with high energy efficiency.

JP 2004-93018 A Japanese Patent No. 3147142

  However, in the configuration of Patent Document 1, not only a heat exchanger but also a heat pump is required in order to sufficiently dry a high water content waste, and it is necessary to distribute electric power from the outside in order to operate the heat pump. Further, this configuration does not have a mechanism for recovering latent heat or sensible heat of waste water, and efficient energy recovery is not performed.

  On the other hand, in the configuration of Patent Document 2, it is considered that energy efficiency is high because a large amount of heat of evaporation can be given to moisture in waste with a small amount of compression work performed by a steam compressor. However, in order to drive the steam compressor, it is necessary to supply energy from the outside, and it cannot be operated independently.

  Therefore, the present invention drives a high water content organic waste treatment system capable of independent operation, that is, a drier for sufficiently drying a dehydrated cake obtained by dewatering organic content-containing wastewater by a dewatering means. It is an object of the present invention to provide a processing system that does not depend on the outside for energy such as electric power required for this.

Means and effects for solving the problems

  In order to solve the above-mentioned problems, the first invention is a latent heat recovery type vacuum drying system comprising a compressor for drying a highly water-containing organic waste under reduced pressure and using the latent heat of steam generated by drying for heating. And a first furnace for incinerating the dried cake obtained by drying the high water content organic waste by the latent heat recovery type vacuum dryer, and generating high-temperature steam using the exhaust heat from the first furnace A waste heat recovery device comprising a boiler to be driven and a turbine driven by steam from the boiler, and the compressor of the latent heat recovery type vacuum dryer is powered by electric power or power generated by the waste heat recovery device. Drive.

According to the above configuration, the high water content organic waste is dried to such an extent that it can be self-combusted. Therefore, it is not necessary to supply auxiliary fuel such as fossil fuel to the first furnace for incinerating the high water content organic waste. Thereby, processing costs can be reduced.
In addition, the energy for driving the compressor of the latent heat recovery type vacuum dryer is not dependent on the outside, and is provided by the power or power obtained by the waste heat recovery device. Can be operated independently.

A second invention is a high water content organic waste treatment system according to the first invention,
The first furnace is an incinerator that oxidizes and incinerates the dried cake.

  With the above configuration, the energy of the high water content organic waste can be extracted as thermal energy.

A third invention is a high water content organic waste treatment system according to the first invention,
The first furnace is a gasification furnace in which the dried cake is subjected to dry distillation and gasification, and the generated combustible gas is combusted.

  With the above configuration, the energy of the high water content organic waste can be extracted as thermal energy.

  A fourth invention comprises a latent heat recovery type vacuum dryer provided with a compressor for drying a high water content organic waste under reduced pressure and using the latent heat of steam generated by drying for heating, and the latent heat recovery type vacuum drying A gasification furnace for producing a combustible gas by dry distillation and gasification of a dry cake obtained by drying the high water content organic waste in a machine, and a gas engine or a gas turbine driven by the combustible gas, And the compressor of the latent heat recovery type vacuum dryer is driven by electric power or power generated by the gas engine or the gas turbine.

With the above configuration, the high water content organic waste is sufficiently dried, so that the dry cake of the high water content organic waste can be dry-distilled and gasified in the gasification furnace without additional input of auxiliary fuel. Can do.
In addition, the energy for driving the compressor of the latent heat recovery type vacuum dryer is not dependent on the outside and is covered by the power or power obtained from the gas engine or the gas turbine. The processing system can be operated independently.

  5th invention is a processing system of the high water content organic waste in any one of 1st-3rd invention, Comprising: The heat exchanger which collect | recovers the waste heat from said 1st furnace or said waste heat recovery apparatus The high water content organic waste is heated by a heat medium heated by the heat exchanger.

  With the above configuration, since the heat energy recovered by the heat exchanger is used to heat the high water content organic waste, even in a system configuration with a high boiler outlet temperature, the turbine outlet Even in a system configuration with high steam temperature (back pressure turbine), the high water content organic waste having a water content of about 85 wt% can be dried to such an extent that it can be self-combusted in the first furnace.

A sixth invention is a treatment system for high water content organic waste according to the fourth invention,
A heat exchanger for recovering waste heat from at least one of the combustible gas, the gas engine or the gas turbine, or the exhaust gas discharged from the gas engine or the gas turbine, and the heat exchange The high water content organic waste is heated by a heating medium heated by a vessel.

  With the above configuration, since the heat energy recovered by the heat exchanger is used to heat the high water content organic waste, the high water content organic waste to the extent that it can be self-combusted in the first furnace. Can be dried. Therefore, it is possible to operate the high water content organic waste treatment system independently.

  Hereinafter, based on FIG. 1, one Embodiment of the processing system of the high water content organic waste which concerns on this invention is described.

  Here, although the processing system of the high water content organic waste which concerns on this invention demonstrates regarding the example provided with an incinerator, a waste heat boiler, and a steam turbine as main structures, of course, it is not limited to this.

  FIG. 1 is a processing flow diagram of a high water content organic waste processing system according to an embodiment of the present invention.

The high water content organic waste treatment system 100 is roughly configured as follows.
That is, the latent heat recovery type vacuum dryer 10 that dries the dehydrated cake 2 that is the organic component-containing wastewater 1 that has been dehydrated by the mechanical dehydrator 50 to form the dried cake 3, and the dried cake 3. The incineration unit 20 for incineration, the waste heat recovery device 30 for recovering the thermal energy generated in the incineration unit 20, the thermal energy of the exhaust gas discharged from the waste heat recovery device 30 is recovered, and the exhaust gas is disposed of with high water content And a post-processing device 40 that discharges from the product processing system 100.

The latent heat recovery type vacuum dryer 10 is configured as follows.
That is, the decompression tank 11 for storing the dehydrated cake 2, the hopper 12 connected to the mechanical dehydration processor 50 for supplying the dehydrated cake 2 to the decompression tank 11, the inside of the decompression tank 11 is decompressed, and thereby A steam compressor 13 that sucks and compresses water vapor or the like evaporated from the dewatered cake 2 stored in the decompression tank 11, is provided in the decompression tank 11, is connected to the steam compressor 13, and is compressed by flowing from the steam compressor 13. The water vapor condenser 14 that heats the dehydrated cake 2 by condensing the water vapor and the like, the relief valve 15 that discharges the noncondensable gas contained in the water vapor and the like into the atmosphere, and the water vapor condenser 14 are condensed. And a steam trap 16 for discharging condensed water. However, the heat exchanger 41a shown in FIG. 1 will be described later.

  The decompression tank 11 stores the dehydrated cake 2 in a substantially sealed state. The decompression tank 11 has a batch structure, and the dehydrated cake 2 is dried for a predetermined time. Moreover, the dry cake discharge port 11a which discharges the produced | generated dry cake 3 is provided. The decompression tank 11 is strong enough to withstand the inside of the decompression tank 11 and preferably the decompression tank 11 is insulated from the outside.

  The mechanical dehydrator 50 is provided outside the high water content organic waste processing system 100 and dehydrates the organic component-containing waste water 1. Examples thereof include a filter press type dehydrator and a screw press type dehydrator. The moisture content of the dehydrated cake 2 dehydrated by the mechanical dehydrator 50 reaches 75 to 85 wt%. The mechanical dehydration processor 50 supplies the dehydrated cake 2 to the hopper 12 of the latent heat recovery type vacuum dryer 10.

  Here, the organic component-containing wastewater 1 refers to organic waste containing organic sludge, sewage sludge, and the like and having a moisture content close to 100%.

The steam compressor 13 decompresses the inside of the decompression tank 11, and sucks and compresses the steam and the like evaporated from the dehydrated cake 2 stored in the decompression tank 11. It is connected to the decompression tank 11 and the water vapor condenser 14 and is driven by a water vapor compressor drive motor 13m. The steam compressor drive motor 13m is driven by electric power (or may be power), and the drive source is supplied from the outside of the latent heat recovery type vacuum dryer 10, which will be described in detail later.
Examples of the operation method of the water vapor compressor 13 include a swing type, a reciprocating type, a screw type, a root type, and a rotary type.

  The steam condenser 14 is provided in the decompression tank 11. The dehydrated cake 2 is heated with a small amount of compression work by condensing the compressed water vapor boiled under reduced pressure and flowing from the reduced pressure tank 11 via the water vapor compressor 13 at a higher temperature. One of the steam condensers 14 is connected to the steam compressor 13, and the other is connected to the relief valve 15 and the steam trap 16. The steam condenser 14 is provided in contact with the dehydrated cake 2 in the decompression tank 11 in order to exchange heat with the dehydrated cake 2 in the decompression tank 11. Examples of the shape of the water vapor condenser 14 include a coiled one, and one having the decompression tank 11 as a double wall. The compressed water vapor or the like flowing from the water vapor compressor 13 is condensed in the water vapor condenser 14 to heat the dehydrated cake 2 via the water vapor condenser 14.

  The relief valve 15 discharges the noncondensable gas contained in the water vapor or the like into the atmosphere. The relief valve 15 is connected to the outlet of the water vapor condenser 14. The non-condensable gas is, for example, air. The relief valve 15 can spontaneously discharge the noncondensable gas without using an extraction pump or a vacuum pump.

  The steam trap 16 discharges the condensed water condensed by the water vapor condenser 14. Similar to the relief valve 15, it is connected to the outlet of the water vapor condenser 14.

The incinerator 20 is configured as follows.
That is, an incinerator 21 for storing and incinerating the dry cake 3, a hopper 22 for supplying the dry cake 3 discharged from the latent heat recovery type vacuum dryer 10 to the incinerator 21, and incombustibility of incombustibles and the like. And an incombustible discharge port 23 for discharging the waste 4. A waste heat boiler 31 is connected to the incinerator 21.

  The incinerator 21 is for storing and incinerating the dry cake 3. The dried cake 3 is supplied by a hopper 22 described later. The incineration method of the incinerator 21 is a rotary kiln furnace, but is not limited to this, and may be, for example, a stoker furnace or a fluidized bed furnace.

  The hopper 22 stores the dried cake 3 discharged from the normal batch type latent heat recovery type vacuum dryer 10. The dried cake 3 stored in the hopper 22 is quantitatively distributed to the incinerator 21.

  The incombustible discharge port 23 is used for discharging incombustible waste 4 such as incombustible material that is not incinerated in the incinerator 21. The incombustible waste 4 discharged from the incombustible discharge port 23 is appropriately pulverized and then, for example, landfilled.

  The waste heat boiler 31 connected to the upper part of the incinerator 21 will be described later.

The waste heat recovery apparatus 30 is configured as follows.
That is, a waste heat boiler 31 that generates steam using thermal energy generated in the incinerator 21, a steam turbine 32 that converts steam generated in the waste heat boiler 31 into power, and power generated in the steam turbine 32. And a condenser 34 that condenses the steam discharged from the steam turbine 32.

  Here, the generator 33 converts power generated in the steam turbine 32 into electric power. Since the steam compressor drive motor 13m can be driven by the electric power generated by the generator 33, a self-sustaining operation can be performed. Moreover, if there is not only this but surplus electric power, it will be utilized also for other facilities.

The post-processing device 40 is configured as follows.
That is, the heat exchanger 41 that heats the heat medium using the exhaust gas discharged from the incinerator 21 or the waste heat boiler 31, and the exhaust gas that removes / detoxifies harmful substances contained in the exhaust gas using a chemical reaction or a catalyst. The processing unit 42, an induction fan 43 that sucks out the exhaust gas processed by the exhaust gas processing unit 42, and a chimney 44 that discharges the exhaust gas sucked out by the induction fan 43 into the atmosphere.

  The heat exchanger 41 heats the heat medium using the exhaust gas discharged from the incinerator 21 or the waste heat boiler 31. The heated heat medium heats the dehydrated cake 2 through a heat exchanger 41 a provided in the decompression tank 11. The heat exchanger 41 and the heat exchanger 41a are connected via a flow path 41b. Examples of the heat medium include oil and air.

  Here, the heat exchanger 41 and the heat exchanger 41a can also be used for preheating the dehydrated cake 2 when the apparatus is activated. Moreover, it is required in the case of a system configuration in which the boiler outlet temperature is high (boiler efficiency is low). On the other hand, if the boiler outlet temperature is low (boiler efficiency is high) and the moisture content of the dehydrated cake 2 is 85 wt% or less, only by the drying capability of the latent heat recovery type vacuum dryer 10, The dehydrated cake 2 can be dried to such an extent that it can self-combust.

  Next, the operation of the high water content organic waste treatment system 100 according to the present embodiment will be described. However, a mechanical dehydration process, which is a pretreatment for the high water content organic waste treatment system 100, is also described.

  Hereinafter, the operation of the latent heat recovery type vacuum dryer 10 will be described.

(Mechanical dehydration process)
The organic component-containing wastewater 1 to be carried in is first supplied to the mechanical dehydrator 50 and subjected to dehydration. Thereby, the dewatering cake 2 is formed. Examples of the dehydration method of the mechanical dehydrator 50 include a filter press type and a screw press type.
It is desirable that the moisture content of the dehydrated cake 2 is lower. However, when dewatering 80 wt% or more of organic waste water 1, around 80 wt% is the limit in the prior art.

(Supply process)
The dehydrated cake 2 formed by the mechanical dehydrator 50 is supplied to the vacuum tank 11 at predetermined time intervals by a hopper 12 connected to the vacuum tank 11. The predetermined time interval is mainly the time required for the dehydrated cake 2 to be sufficiently dried in the latent heat recovery type vacuum dryer 10, and the moisture content / component / amount of the dehydrated cake 2 and the latent heat recovery type. It varies depending on conditions such as the drying capacity of the vacuum dryer 10.
When a predetermined amount of dehydrated cake 2 is stored in the decompression tank 11, the supply from the hopper 12 is stopped, and the decompression tank 11 is in a sealed state.

(Decompression start process)
After the decompression tank 11 is sealed, preheating is started by the heat exchanger 41a, and then the steam compressor 13 is operated, and the air in the decompression tank 11 is excluded. As a result, the pressure in the decompression tank 11 is reduced, and the dehydrated cake 2 is heated via the steam condenser 14 when the air heated in the steam compressor 13 passes through the steam condenser 14. Thereby, for example, when the temperature of the dehydrated cake 2 becomes about 50 ° C. and the atmospheric pressure in the decompression tank 11 becomes about 12 kPa, boiling of moisture in the dehydrated cake 2 is promoted.

(Condensation start process)
The water vapor generated by the evaporation of the water in the dehydrated cake 2 is compressed by the water vapor compressor 13, heated up, and condensed to release heat when passing through the water vapor condenser 14 connected to the water vapor compressor 13. To do. Thereby, the dewatering cake 2 in the decompression tank 11 is heated.
When the pressure in the steam condenser 14 becomes a certain pressure (for example, 2.0 atmospheres) or more, the relief valve 15 is opened, and air containing non-condensable gas is spontaneously discharged into the atmosphere. Further, the condensed water generated in the condensation process is spontaneously discharged from the steam trap 16.

(Steady operation)
As described above, the step of supplying the dehydrated cake 2 by the hopper 12, the step of evaporating the moisture of the dehydrated cake 2 in the decompression tank 11, the step of compressing the water vapor generated thereby, and the step of condensing the compressed water vapor By continuing the heating process for heating the dehydrated cake 2 in the condensation process and the discharging process for non-condensable gas and condensed water, the temperature in the decompression tank 11 gradually increases and reaches the rated operation state. . The rated operating state refers to, for example, that the inside of the decompression tank 11 is 90 ° C./70 kPa and the inside of the steam condenser 14 in a saturated state is 110 ° C./143 kPa, for example.

(Effect of latent heat recovery type vacuum dryer 10)
As described above, since the latent heat recovery type vacuum dryer 10 is operated in a steady state, the following effects can be obtained.
First, the steam generated in the decompression tank 11 is compressed and then condensed in the steam condenser 14 provided in the decompression tank 11, so that the latent heat energy of the steam is regenerated with a small amount of compression work (electric power). There is an effect that can be.
Secondly, the energy required to operate the latent heat recovery type vacuum dryer 10 is mainly electric power for driving the steam compressor drive motor 13m. The electric power for driving the steam compressor drive motor 13m is about 1/7 of the work required for drying. On the other hand, electric power for driving the steam compressor drive motor 13m is supplied from the generator 33 of the waste heat recovery apparatus 30. Therefore, for example, even if the moisture content of the dehydrated cake 2 put into the dryer is around 80 wt%, the dehydrated cake 2 can be dried until the moisture content reaches 60 wt% so that it can be self-combusted in the incinerator 20. There is an effect that the high water content organic waste treatment system 100 can be operated independently.
Thirdly, the decompression tank 11 for storing and drying the dehydrated cake 2 is in a decompressed state. Thereby, the water | moisture content which the spin-drying | dehydration cake 2 has can be evaporated at lower temperature. In other words, there is an effect that the evaporation of moisture can be promoted at a low temperature (low quality energy).
Fourth, since the dehydrated cake 2 is heated not only by the steam condenser 14 but also by the heat exchanger 41a described later, the latent heat recovery type vacuum dryer 10 can be quickly started up. There is an effect.

  Next, the operation of the incinerator 20 will be described below.

(Supply process)
The dried cake 3 formed by drying in the latent heat recovery type vacuum dryer 10 for a predetermined time is appropriately supplied to the incinerator 21 of the incinerator 20 through the hopper 22.

(Incineration process)
The dried cake 3 stored in the incinerator 21 is burned in the incinerator 21. Here, the high water content organic waste treatment system 100 according to the present embodiment includes the latent heat recovery type vacuum dryer 10 so that the dehydrated cake 2 is dried to such an extent that it can self-combust. There is no need to supply auxiliary fuel such as fossil fuels.

  In addition, a waste heat boiler 31 is provided in the incinerator 21 in order to recover the thermal energy generated in the incineration process.

(Incombustible discharge process)
The dehydrated cake 2 contains incombustible waste 4 that does not burn or evaporate. An incombustible discharge port 23 for discharging such incombustible waste 4 is provided in the incinerator 21. On the other hand, the incombustible waste 4 is sufficiently pulverized after being discharged from the incombustible discharge port 23, for example, landfilled.

  Next, the operation in the waste heat recovery apparatus 30 will be described.

(Boiler process)
The waste heat boiler 31 is operated by the thermal energy generated in the incinerator 21 and high-temperature steam is generated.

(Turbine process)
The steam turbine 32 connected to the waste heat boiler 31 is operated by the steam generated in the waste heat boiler 31.

(Power generation process)
Electric power is generated by a generator 33 connected to the steam turbine 32. The generated electric power is distributed to the steam compressor drive motor 13m, so that the latent heat recovery type vacuum dryer 10 is driven by the energy of the dehydrated cake 2.
In addition, if surplus occurs in the generated power, in addition to the latent heat recovery type vacuum dryer 10, for example, power distribution to each facility of the high water content organic waste treatment system 100 and surrounding areas, power trading transactions, etc. Used. Further, the mechanical dehydration processor 50 may be used.

(Condensation process)
The steam exhausted from the steam turbine 32 is condensed in the condenser 34 by water cooling or air cooling.

(Effect of the waste heat recovery device)
As described above, the following effects can be achieved by continuing the boiler process, the turbine process, the power generation process, and the condensate process.
That is, the electric power source for driving the steam compressor drive motor 13m of the latent heat recovery type vacuum dryer 10 uses heat energy generated in the process of incinerating the dehydrated cake 2 to be dried by the latent heat recovery type vacuum dryer 10. Since it is the converted electric power energy, there exists an effect that the high water content organic waste processing system 100 which concerns on this embodiment can operate | move independently on the electric power from the outside.

  Furthermore, the operation | movement in the post-processing process 40 is demonstrated.

(Heat exchange process)
Most of the heat energy generated in the incinerator 21 is recovered by the waste heat boiler 31, but is also recovered by the heat exchanger 41. The waste heat discharged from the incinerator 21 or the waste heat boiler 31 heats the heat medium such as oil flowing through the flow path 41b via the heat exchanger 41. The heated heat medium flows into the heat exchanger 41a in the latent heat recovery type vacuum dryer 10, whereby the dehydrated cake 2 is heated.
Therefore, even in a system configuration with a high boiler outlet temperature or a system configuration with a high turbine outlet steam temperature (back pressure turbine), the dewatered cake 2 having a water content of about 85 wt% is self-sustained in the incinerator 21. It can be dried to the extent possible.

(Exhaust gas treatment process)
Exhaust gas that has passed through the heat exchanger 41 is a technology for removing harmful substances using a chemical reaction in an exhaust gas treatment device 42, a technique for incinerating exhaust gas to make it harmless, a technique for removing harmful substances using a catalyst, It is purified by.

(Exhaust gas emission process)
The exhaust gas purified by the exhaust gas treatment device 42 is released into the atmosphere by the induction fan 43 through the chimney 44.

(Effects of the post-processing process)
As described above, by continuously performing the heat exchange process by the heat exchanger 41, the exhaust gas treatment process by the exhaust gas processor 42, and the exhaust gas discharge process by the induction fan 43 and the chimney 44, the following There is an effect.
That is, since the heat energy recovered by the heat exchanger 41 is used to heat the dehydrated cake 2 stored in the vacuum tank 11 of the latent heat recovery type vacuum dryer 10, the system having a high boiler outlet temperature. Even if it is a structure or a system structure (back pressure turbine) with a high turbine outlet steam temperature, it is possible to dry the dehydrated cake 2 having a water content of about 85 wt% to such an extent that it can be self-combusted in the incinerator 21. it can.

  In the high water content organic waste treatment system 100 according to the present embodiment, the kinetic energy obtained by the steam turbine 32 is converted into electric energy and used for driving the steam compressor drive motor 13m. However, the present invention can be freely designed without departing from the technical idea of the present invention.

  For example, the steam turbine 32 and the steam compressor 13 may be connected by mechanical means using a power transmission device such as a gear device, a crankshaft, a camshaft, or a transmission belt. Thereby, the energy loss accompanying the energy conversion can be eliminated.

  Furthermore, as shown in FIG. 2, a low-pressure steam reservoir 34a, a heat exchanger 34b, and a condensate tank 34c may be provided instead of the condenser 34. Thereby, the thermal energy of the steam exhausted from the steam turbine 32 can be used for heating the dehydrated cake 2.

  In this embodiment, an incinerator is used as a means for generating thermal energy from the dried cake in order to drive the boiler / turbine and obtain electric power, etc. A gasification furnace that generates combustible gas may be used.

  Furthermore, you may drive a gas engine or a gas turbine using the combustible gas produced | generated by the gasification furnace. In this case, the steam compressor of the latent heat recovery type vacuum dryer is driven by energy (for example, electric power or power) recovered by a gas engine or a gas turbine.

  In addition, the latent heat recovery type vacuum dryer uses at least one of the generated combustible gas, the gas engine or the gas turbine, or the exhaust gas discharged from the gas engine or the gas turbine. The dehydrated cake 2 in 10 may be heated. In this case, the waste heat is recovered by an appropriate heat exchanger, and the heated heat medium heats the dehydrated cake 2 via an appropriate heat exchanger provided in the latent heat recovery type vacuum dryer 10. Thereby, the time required for drying the dewatering cake 2 can be shortened.

  Note that the gas engine or the gas turbine and the latent heat recovery type vacuum dryer may be mechanically connected using a power transmission device such as a gear device, a crankshaft, a camshaft, or a transmission belt. Thereby, the energy loss accompanying the energy conversion can be eliminated.

  With the above configuration, the high water content organic waste treatment system 100 according to the present embodiment has the following effects.

Latent heat recovery type vacuum dryer 10 equipped with a compressor (steam compressor 13) for drying high-moisture organic waste (dehydrated cake 2) under reduced pressure and using the latent heat of steam generated by drying for heating; A first furnace (incinerator 21) that incinerates the dried cake 3 obtained by drying the dehydrated cake 2 with the latent heat recovery type vacuum dryer 10 and high-temperature steam is generated using the exhaust heat from the incinerator 21. A waste heat recovery device 30 comprising a boiler (waste heat boiler 31) and a turbine (steam turbine 32) driven by steam from the waste heat boiler 31, and power or power generated by the waste heat recovery device 30 Thus, the steam compressor 13 of the latent heat recovery type vacuum dryer 10 is driven. As a result, the dehydrated cake 2 is dried to such an extent that it can self-combust, so that it is not necessary to supply auxiliary fuel such as fossil fuel to the incinerator 21 that incinerates the dehydrated cake 2. Thereby, processing costs can be reduced.
Further, the energy for driving the steam compressor 13 of the latent heat recovery type vacuum dryer 10 is not dependent on the outside, and is provided by the electric power or power obtained by the waste heat recovery device 30, so that the high water content organic waste treatment system 100 can be provided. It can be operated independently.

  The first furnace may be an incinerator 21 that oxidizes and incinerates the dried cake 3. With the above configuration, the energy of the dehydrated cake 2 can be extracted as thermal energy.

  The first furnace may be a gasification furnace in which the dry cake is subjected to dry distillation and gasification, and the generated combustible gas is combusted. With the above configuration, the energy of the high water content organic waste can be extracted as thermal energy.

The dehydrated cake 2 is dried under reduced pressure, and the latent heat of the steam generated by the drying is used for heating. The latent heat recovery type vacuum dryer 10 having the steam compressor 13 and the latent heat recovery type vacuum dryer 10 are used to dehydrate the cake 2. The dry cake 3 obtained by drying is gasified and gasified to produce a combustible gas, and a gas engine or a gas turbine driven by the combustible gas, the gas engine or the The steam compressor 13 of the latent heat recovery type vacuum dryer 10 is driven by electric power or power generated by the gas turbine.
With the above configuration, the dehydrated cake 2 is sufficiently dried, so that the dry cake 3 obtained by drying the dehydrated cake 2 is dry-distilled and gasified in the gasification furnace without additionally supplying auxiliary fuel. be able to.
In addition, the energy for driving the steam compressor 13 of the latent heat recovery type vacuum dryer 10 does not depend on the outside, and is supplied by the power or power obtained from the gas engine or the gas turbine. The system 100 can be operated independently.

A heat exchanger 41 for recovering waste heat from the incinerator 21 or the waste heat recovery device 30;
The dehydrated cake 2 may be heated by the heat medium heated by the heat exchanger 41.
With the above configuration, since the heat energy recovered by the heat exchanger 41 is used to heat the dewatering cake 2, even in a system configuration with a high boiler outlet temperature, the turbine outlet steam temperature Even with a high system configuration (back pressure turbine), the high water content organic waste having a water content of about 85 wt% can be dried to the extent that it can be self-combusted in the first furnace (combustion furnace 21).

A heat exchanger for recovering waste heat from at least one of the combustible gas, the gas engine or the gas turbine, or the exhaust gas discharged from the gas engine or the gas turbine, and the heat exchange The dehydrated cake 2 may be heated by a heat medium heated by a vessel.
With the above configuration, since the thermal energy recovered by the heat exchanger is used to heat the dewatering cake 2, even in a system configuration with a high boiler outlet temperature, the turbine outlet steam temperature Even with a high system configuration (back pressure turbine), the high water content organic waste having a water content of about 85 wt% can be dried to the extent that it can be self-combusted in the first furnace.

The processing flow figure of the processing system 100 of the high water content organic waste which concerns on one Embodiment of this invention. The processing flow figure of the modification of the processing system 100 of the high water content organic waste which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Latent heat recovery type vacuum dryer 13 Steam compressor 14 Steam condenser 21 Incinerator 30 Waste heat recovery device 31 Waste heat boiler 32 Steam turbine 33 Generator 40 Post-processing process 41 Heat exchanger

Claims (6)

Latent heat recovery type vacuum dryer equipped with a compressor for drying high water content organic waste under reduced pressure and using the latent heat of steam generated by drying for heating;
A first furnace for incinerating a dry cake obtained by drying the high water content organic waste in the latent heat recovery type vacuum dryer;
A waste heat recovery device comprising a boiler that generates high-temperature steam using exhaust heat from the first furnace, and a turbine that is driven by the steam from the boiler;
With
A processing system for high water content organic waste, wherein the compressor of the latent heat recovery type vacuum dryer is driven by electric power or power generated by the waste heat recovery device. A high water content organic waste treatment system according to claim 1,
The high water content organic waste processing system, wherein the first furnace is an incinerator for oxidizing and burning the dried cake. A high water content organic waste treatment system according to claim 1,
The high water content organic waste treatment system, wherein the first furnace is a gasification furnace for carbonizing and gasifying the dry cake and combusting the generated combustible gas. Latent heat recovery type vacuum dryer equipped with a compressor for drying high water content organic waste under reduced pressure and using the latent heat of steam generated by drying for heating;
A gasification furnace for producing a combustible gas by dry distillation and gasification of a dry cake obtained by drying the high water content organic waste with the latent heat recovery type vacuum dryer;
A gas engine or gas turbine driven by the combustible gas;
With
A processing system for high water content organic waste, wherein the compressor of the latent heat recovery type vacuum dryer is driven by electric power or power generated by the gas engine or the gas turbine. A high water content organic waste treatment system according to any one of claims 1 to 3,
A heat exchanger for recovering waste heat from the first furnace or the waste heat recovery device;
The high water content organic waste processing system, wherein the high water content organic waste is heated by a heat medium heated by the heat exchanger. A high water content organic waste treatment system according to claim 4,
A heat exchanger for recovering waste heat from at least one of the combustible gas, the gas engine or the gas turbine, or the exhaust gas discharged from the gas engine or the gas turbine;
The high water content organic waste processing system, wherein the high water content organic waste is heated by a heat medium heated by the heat exchanger.

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