JP4996416B2 - Sludge fuel plant - Google Patents

Description

  The present invention relates to a fueling device for sludge generated from a sewage treatment plant or the like.

In recent years, various methods have been proposed for applying predetermined processing to wastes such as plastics discharged in large quantities and using them as resources. In particular, from the viewpoint of reducing CO ₂ emissions, carbon neutral biomass has attracted attention as an alternative energy for fossil fuels. As an example of this, organic materials such as biomass (wood, sludge, livestock manure, garbage, etc.) and waste plastics are pyrolyzed to produce pyrolysis gas and pyrolysis residue, and the pyrolysis gas is condensed. Therefore, a system has been considered in which it is recovered as pyrolysis oil and the residue is used as a carbide by performing a predetermined treatment. Among these, when waste plastic is used as the organic material treatment material, pyrolysis oil can be recovered with high efficiency, and many proposals have been made and put into practical use with respect to an apparatus for pyrolyzing oil into such waste plastic ( For example, see Patent Documents 1, 2, and 3).

On the other hand, sludge generated in large quantities from a sewage treatment plant is one of biomass. Most of the sludge is landfilled or incinerated, and the actual situation is that energy is not effectively used. Therefore, in order to suppress CO ₂ emissions, that is, to suppress the use of fossil fuels, a system for converting sewage sludge, which can be stably collected, into a solid fuel by carbonization, and using it as a fuel for coal-fired power generation It is considered.

  When sludge is incinerated, the amount of heat generated from sludge can be used for incineration heat, so the amount of auxiliary fuel used is small. However, when carbonizing sludge, the amount of auxiliary fuel used for carbonization to increase the amount of heat in the carbide increases. For this reason, it has been proposed to use woody biomass for the purpose of suppressing the use of fossil fuel as auxiliary fuel (see, for example, Patent Document 4).

  According to the technique described in Patent Document 4, it is possible to suppress the use of fossil fuel as auxiliary fuel. In addition, pyrolysis gas generated from woody biomass is added to pyrolysis gas generated from sludge during carbonization in a carbonization furnace, so that the combustion engine is operated using pyrolysis gas as fuel to carbonize sludge. Necessary energy can be obtained. However, woody biomass contains a lot of thinned wood, pruned wood, branches, leaves, etc. with low calorific value, and the calorific value is not stable, so it is difficult to perform constant temperature control of the carbonization furnace. In addition, a large amount of woody biomass must be used as an auxiliary fuel because it is necessary to stabilize the thermal decomposition treatment operation in the carbonization furnace.

  As a countermeasure, in addition to powdered sludge after drying with a dryer, the woody biomass was crushed to stabilize the properties of woody biomass such as waste wood, thinned wood, pruned wood, branches and leaves. It is conceivable to mix woody biomass with a non-constant shape and size into a carbonization furnace. This measure not only makes it difficult to stably charge the carbonization furnace, but also makes it easier for air to enter the input material. In addition, if air is accompanied with the material in the pyrolysis apparatus, the pyrolysis apparatus is in a high temperature atmosphere, which may cause a serious trouble such as burning the input material inside and causing a fire or explosion.

  In the above method, not only sludge but also woody biomass such as waste wood, thinned wood, pruned wood, branches, leaves, etc. will be input into the carbonization furnace, and the moisture content in the input material will fluctuate. Resulting in. For this reason, it is difficult to control the temperature of the combustion furnace to a constant temperature, particularly when a large amount of woody biomass is introduced. At the same time, material sticking, coking, and the like occur on the inner surface of the carbonization furnace, not only lowering the heat passage rate (heat flow rate) of the carbonization furnace, but also causing a serious problem that the treatment becomes impossible in a short time.

  As a means to solve such problems, it is conceivable that the woody biomass input material is crushed, pulverized, or granulated and mixed with sludge while checking the moisture content in a state where the bulk density is increased. . However, the power of the crusher and granulator for crushing and granulating woody biomass is increased, resulting in increased power consumption, labor time, running costs, and installation of processing equipment. There is a big problem that the area becomes large.

  In view of the above-mentioned problems, in the carbonization process for converting sludge into fuel, not only the amount of fossil fuel used is greatly reduced, but also the sludge, which is the main process, is stably converted to carbonized fuel with a small amount of auxiliary fuel. In addition, when sludge and auxiliary fuel are continuously charged into the carbonization furnace, it can be stably charged and carbonized without mixing air, and it is simple and reduces power consumption, greatly reducing running costs. Patent proposals have already been made to provide sludge fueling methods and devices.

However, in any case, sludge itself, woody biomass material as auxiliary fuel,
Waste plastic, or because in the fossil fuel contains many nitrogen (N) content, by combustion in the combustion furnace burner, NO _X will be more likely to occur. The release of NO _X to the atmosphere must be avoided by all means.

As a method for avoiding NO _X release, Patent Document 5 and the like propose to install a non-catalytic denitration device in the duct of the final exhaust gas.
Japanese Patent No. 3340412 Japanese Patent No. 3399764 Japanese Patent No. 3435399 Japanese Patent No. 3861093 JP 2006-112299 A

  However, installing a non-catalytic denitration device in the duct of the final exhaust gas leads to an increase in the size of the sludge fueling device. In addition, such a non-catalytic denitration apparatus is difficult to maintain. There is also a problem that the cost increases.

  The present invention has been made in consideration of such circumstances, and in carbonization treatment for converting sludge into fuel, pyrolysis gas of sludge itself, wood-based biomass material as auxiliary fuel, pyrolysis gas from waste plastic, etc., Alternatively, even if fossil fuels are burned in a combustion furnace, NOx emission can be avoided, no need for an increase in size, and the sludge fueling device can be simple, suppresses power consumption, and reduces running costs. The purpose is to provide.

The sludge fueling apparatus of the present invention is a combustion having a pyrolysis carbonization furnace that generates pyrolysis gas and carbide by pyrolytic carbonization of sludge, and a combustion burner that burns the pyrolysis gas generated in the pyrolysis carbonization furnace The combustion exhaust gas generated in the combustion furnace is used as a heat source of the pyrolysis carbonization furnace, and a spray nozzle that blows water vapor at the front end of the combustion flame of the combustion furnace is installed to generate from the combustion furnace A temperature measuring device for measuring the temperature of the combustion exhaust gas is provided in the combustion exhaust gas discharge part of the combustion furnace so that NOx can be reduced. It is possible to control based on the measured value of the temperature measuring device .

The sludge fueling apparatus of the present invention is a combustion having a pyrolysis carbonization furnace that generates pyrolysis gas and carbide by pyrolytic carbonization of sludge, and a combustion burner that burns the pyrolysis gas generated in the pyrolysis carbonization furnace The combustion exhaust gas generated in the combustion furnace is used as a heat source for the pyrolysis carbonization furnace, and a spray nozzle for injecting urea water into the combustion flame tip of the combustion furnace is installed and generated from the combustion furnace. A temperature measuring device for measuring the temperature of the combustion exhaust gas is provided in the combustion exhaust gas discharge part of the combustion furnace, and the flow rate of urea water sprayed on the front end of the combustion flame is determined by the combustion furnace. The control is based on the measured value of the exhaust gas temperature measuring device .

  According to the above invention, in the carbonization treatment for converting sludge into fuel, even if the sludge itself, woody biomass material, waste plastic, or fossil fuel as auxiliary fuel is burned in the combustion furnace, NOx is released. In addition, it is possible to provide a sludge fuelizing apparatus that can avoid the above-described problem and that does not require an increase in size and that is simple, suppresses power consumption, and reduces running costs.

Hereinafter, the sludge fueling apparatus of the present invention will be described in more detail.
(1) As described above, the sludge fueling apparatus of the present invention has a combustion furnace having a pyrolysis carbonization furnace and a combustion burner, and uses combustion exhaust gas generated in the combustion furnace as a heat source of the pyrolysis carbonization furnace. At the same time, a spray nozzle for blowing water vapor is installed at the front end of the combustion flame of the combustion furnace so that NOx generated from the combustion furnace can be reduced. According to such a configuration, in the carbonization treatment for converting sludge into fuel, pyrolysis gas of the sludge itself, wood biomass material as a supplementary fuel, pyrolysis gas from waste plastics, or fossil fuel is used as a combustion furnace. Even if it is burned, NOx release can be avoided, there is no need for an increase in size, and the power consumption can be reduced simply and the running cost can be reduced.
(2) In the invention of (1), the water vapor generated from the combustion exhaust gas at the heat source of the combustion flame of the combustion furnace includes water vapor generated from the combustion exhaust gas as the heat source.

(3) In the invention of the above (1) or (2), it is preferable that the flow rate of water vapor sprayed on the front end of the combustion flame of the combustion furnace can be controlled based on the NOx measurement value of the combustion furnace exhaust gas. According to such a configuration, since the spraying flow rate of water vapor is controlled by the NOx measurement value, it is possible to always spray an optimal amount of water vapor.
(4) In the above inventions (1) to (3), the combustion exhaust gas discharge part of the combustion furnace is provided with a temperature measuring device for measuring the temperature of the combustion exhaust gas. It is preferable that the flow rate can be controlled based on the measured value of the temperature measuring device for the combustion furnace exhaust gas. According to such a configuration, since the spraying flow rate of water vapor is controlled by the measurement value of the temperature measuring device, it is possible to always spray an optimal amount of water vapor.

  (5) As described above, the sludge fueling apparatus of the present invention has a pyrolysis carbonization furnace and a combustion furnace having a combustion burner, and combustion exhaust gas generated in the combustion furnace is used as a heat source of the pyrolysis carbonization furnace. While being used, the spray nozzle which blows urea water in the combustion flame front-end | tip part of a combustion furnace is installed, and it can reduce NOx generate | occur | produced from a combustion furnace. According to such a structure, it has the same effect as the invention of (1) above.

(6) In the invention of the above (5), it is preferable that the flow rate of the urea water sprayed on the front end of the combustion flame of the combustion furnace can be controlled based on the NOx measurement value of the combustion furnace exhaust gas. According to such a configuration, the urea water spraying flow rate is controlled by the NOx measurement value, so that the optimal urea water can always be sprayed.
(7) In the invention of the above (5) or (6), the combustion exhaust gas discharge part of the combustion furnace is provided with a temperature measuring device for measuring the temperature of the combustion exhaust gas, and the urea water sprayed on the front end of the combustion flame It is preferable that the flow rate can be controlled based on the measured value of the temperature measuring device for the combustion furnace exhaust gas. According to such a configuration, the same effect as the above (6) can be obtained.
(8) In the inventions of the above (1) to (7), it is preferable that the combustion furnace burns a pyrolysis gas generated from the pyrolysis carbonization furnace at a high temperature of 850 ° C. or higher.

Next, an embodiment of the sludge fueling apparatus of the present invention will be described with reference to the drawings. Note that the present embodiment is not limited to the following description.
(First embodiment)
FIG. 1 is a conceptual flow diagram of a sludge fueling apparatus according to a first embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of the combustion furnace of the sludge fueling apparatus.
As shown in FIG. 1, the sludge fueling apparatus indirectly uses a sludge feeder (input feeder) 2 into which sewage sludge 1 is input and sewage sludge that is quantitatively input from the input feeder 2 with water vapor. A drying furnace 3 for drying by heating, a drying sludge charging hopper 4 for charging dried dewatered sludge, a drying sludge charging machine 5 connected to the drying sludge charging hopper 4, and an outside for carbonizing the dried sewage sludge Thermal rotary kiln type pyrolysis carbonization furnace 6, ceramic combustion furnace 7 for burning pyrolysis gas generated in the pyrolysis carbonization furnace 6, and combustion exhaust gas (hot air) generated in the combustion furnace 7 as a heat source The exhaust heat recovery boiler 8 is mainly configured.

  A carbide discharge duct 9 is installed on the outlet side of the pyrolysis carbonization furnace 6, and the carbide 10 is discharged from the duct 9. Carbide 10 is stored in carbide storage hopper 12 through carbide cooler 11. The product carbide that has been cooled and accumulated in the carbide storage hopper 12 is controlled so that the level or weight in the hopper is measured and monitored, and is periodically transported according to the state quantity. Shipped and transported according to

  The inner cylinder side of the pyrolysis carbonization furnace 6 and the combustion furnace 7 are connected by a line 13 that is a pipe of pyrolysis gas generated in the pyrolysis carbonization furnace 6. The pyrolysis gas is sucked through a line 13 into a combustion burner (not shown) in the combustion furnace 6. The combustion furnace 7 and the outer jacket portion 6 a of the pyrolysis carbonization furnace 6 are connected by a first combustion exhaust gas line (hot air line) 14 a that sends combustion exhaust gas from the combustion furnace 7 to the pyrolysis carbonization furnace 6. The pyrolysis carbonization furnace 6 and the exhaust heat recovery boiler 8 are connected by a second combustion exhaust gas line 14 b that sends combustion exhaust gas from the pyrolysis carbonization furnace 6 to the exhaust heat recovery boiler 8. The third combustion exhaust gas line 14c from the exhaust heat recovery boiler 8 is joined to the first combustion exhaust gas line 14a. Here, the first to third combustion exhaust gas lines 14a, 14b, and 14c constitute a hot air circulation line, whereby the exhaust gas hot air circulation air volume for heating in the pyrolysis carbonization furnace 6 can be increased.

  In FIG. 1, reference numeral 15 indicates a line for sending the dry exhaust gas from the drying furnace 3 to the dust collector 16. The dried exhaust gas is used as combustion air in the combustion furnace 7 through the dust collector 16. In FIG. 1, numeral 17 is a hot air circulation blower for sucking hot air exhaust gas from the exhaust heat recovery boiler 8, numeral 18 is a cleaning device for cleaning hot air exhaust gas, numeral 19 is an exhaust tower, Reference numeral 20 denotes an air preheater, and reference numeral 23 denotes a hot air suction blower.

Next, the configuration of the sludge fueling device will be described in more detail.
In FIG. 1, steam generated in the exhaust heat recovery boiler 8 is used as a heat source for the drying furnace 3 so that the temperature in the drying furnace 3 becomes high and no pyrolysis gas is generated from the processing material. However, the method is not particularly limited as long as the hot air temperature is lowered and the hot air is brought into direct contact or the dehydrated sludge can be dried without burning.

  The dewatered sludge discharged from the drying furnace 3 is transported to the dry sludge charging hopper 4 via the dry sludge transport line 21, and in the middle of the hopper 4, a conveyor and an air transporter that can transport the dried sludge ( Etc.) are arranged. It is preferable to make an optimum design as appropriate according to the processing scale, layout, and the like.

  In FIG. 1, the pyrolysis carbonization furnace 6 is an external heating type rotary kiln type. In the inner cylinder of the pyrolysis carbonization furnace 6, dry sludge is continuously charged from the dry sludge charging machine 5 in a state where oxygen is not mixed, and combustion exhaust gas as a heating source is caused to flow to the outer jacket portion 6a of the internal kiln that rotates while being held. ing. Moreover, it is set as the structure which discharge | releases the production | generation carbide | carbonized_material 10 and pyrolysis gas from the inner cylinder of the other side which heats an internal kiln from the outside.

  In the combustion furnace 7, the pyrolysis gas is completely burned and detoxified at 850 ° C. or more and a residence time of 2 seconds or more, and then the generated hot air passes through the first combustion exhaust gas line 14 a to the outside of the pyrolysis carbonization furnace 6. It blows to the jacket part 6a. The dried exhaust gas from the drying furnace 3 is used as combustion air in the combustion furnace 7 via the line 15 and the dust collector 16.

The combustion exhaust gas discharged from the outer jacket portion 6a of the pyrolysis carbonization furnace 6 is introduced into the exhaust heat recovery boiler 8 through the second combustion exhaust gas line 14b. The combustion exhaust gas discharged from the exhaust heat recovery boiler 8 is sucked into the hot air circulation blower 17 and circulated to the outer jacket portion 6a side of the pyrolysis carbonization furnace 6 through the third combustion exhaust gas line 14c, and a part thereof is a hot air suction blower. 23 and is discharged from the exhaust tower 19 via the exhaust line 22 to the outside of the system.
When the load of the exhaust heat recovery boiler 8 is low, the remaining portion of the combustion exhaust gas can be discharged from the exhaust tower 19 to the outside of the system, or if there is another heating source, the exhaust gas can be supplied to them. is there.

  In the exhaust heat recovery boiler 8, steam is generated using hot air heated in the pyrolysis carbonization furnace 6, and the drying furnace 2 is heated using this steam as a heat source. The hot air exhaust gas discharged from the exhaust heat recovery boiler 8 is sucked by the hot air suction blower 17, and dust is removed from the exhaust gas by the cleaning device 18, and then exhausted from the exhaust tower 19.

  In FIG. 1, a hot air exhaust gas sucked by the hot air suction blower 17 is cleaned by a cleaning device 18, and a cleaning device 18 using the exhaust gas discharged from the hot air suction blower 17 as a heating source is installed to prevent white smoke from the exhaust gas. The air is heated and mixed with the gas exhausted from the exhaust tower 19. However, if the hot air exhaust gas contains almost no dust, it may be exhausted as it is without installing the cleaning device 18 or the white smoke prevention device.

  A pyrolysis gas generated in the pyrolysis carbonization furnace 6 is added to the combustion furnace 7 through a line 13, and dry exhaust gas from the drying furnace 3 is introduced as combustion air through a line 14 and a dust collector 15. . And it burns at the temperature of about 850 degreeC as mentioned above. The combustion exhaust gas generated by this combustion is introduced into the outer jacket portion 6a of the pyrolysis carbonization furnace 6 through the first combustion exhaust gas line 14a and used as a heat source for the pyrolysis carbonization treatment. Thereby, sufficient energy required for the pyrolytic carbonization treatment can be obtained, so that the amount of fossil fuel used can be greatly reduced. However, in the operation at the initial start-up, it is inevitable that a small amount of fossil fuel (kerosene, LPG gas, etc.) is supplied to the combustion furnace 7 as auxiliary fuel.

Next, the combustion furnace 7 will be described with reference to FIG.
A main burner 32 and an auxiliary burner 33 for burning the pyrolysis gas sent from the pyrolysis gas line 13 are provided at the upper part of the combustion furnace 7. Here, the auxiliary burner 33 is used at the time of starting or when the amount of heat of the pyrolysis gas is insufficient. Further, an upper part of the combustion furnace 7 is provided with an inlet 34 for introducing diluted air (dry exhaust gas) and a spray nozzle 36 for introducing water vapor into the flame front end of the combustion furnace through a water vapor supply line 35. A discharge part 37 for discharging the final exhaust gas is provided at the lower part of the combustion furnace 7, and a NOx measuring device 38 is provided in the discharge part 37. The flow rate of water vapor injected can be controlled by the measured value of the NOx measuring device 38. In the figure, reference numeral 39 indicates flame, and reference numeral 40 indicates combustion exhaust gas (hot air).

Next, the operation of the sludge fueling apparatus having the above-described configuration will be described with reference to FIGS.
First, the sewage sludge 1 dehydrated until the water content becomes about 80% is quantitatively sent to the dryer 3 by the sludge feeder 2. The sludge targeted in the present invention is not limited to sewage sludge as long as it is an organic sludge that can be solidified by carbonization. For example, food sludge, papermaking sludge, billpit sludge, digested sludge, activated sludge It can also be applied to sludge.

  In the dryer 3, the sludge is dried until the moisture of the sludge becomes about 40%. The dried sludge is quantitatively dropped from the dewatered sludge storage hopper 4 to the dry sludge charging machine 5 via the line 21, and is introduced into the pyrolysis carbonization furnace 6 through the dry sludge charging machine 5.

  In the pyrolysis carbonization furnace 6, sludge is heated to about 300 to 600 ° C. in an oxygen-free state to perform pyrolysis carbonization to produce pyrolysis gas and carbide 10 as a solid fuel. Since the required properties of the carbide 10 vary depending on the use application of the generated carbide, the combustion exhaust gas temperature of the heating source is adjusted according to the situation. The pyrolysis gas is introduced into the combustion furnace 7 via the line 13. The carbide 10 is stored in the carbide storage hopper 12.

  Also, by adjusting the combustion exhaust gas temperature of the heating source of the exhaust heat recovery boiler 8 and appropriately controlling the amount of steam and the steam temperature generated in the exhaust heat recovery boiler 8, it is possible to safely prevent the sewage sludge from being overheated. It can be dried under constant temperature conditions.

  On the other hand, the pyrolysis gas is burned in the main burner 32 of the combustion furnace 7 to generate combustion exhaust gas. The combustion exhaust gas is sent as a heat source for the pyrolysis carbonization furnace 6 and the exhaust heat recovery boiler 8 and is released into the atmosphere after circulating hot air. It should be noted that combustion is performed in the auxiliary burner 33 of the combustion furnace 7 when starting up or when the amount of heat of the pyrolysis gas is insufficient.

  In the combustion furnace 7, the main burner 32 burns at a high temperature of 850 ° C. or more for 2 seconds or more. At this time, water vapor is blown from the water vapor blowing spray nozzle 36 to a position near the tip of the burner flame.

  Water vapor suppresses the amount of NOx in the exhaust gas in the combustion furnace. The suppression principle is described in detail in pages 134 to 137 of the Japan Society of Mechanical Engineers "Technical data: Mechanism of generation of environmental pollutants associated with combustion and its suppression method" (issued on December 20, 1980). ing. Thereby, the NOx amount of the combustion exhaust gas can be suppressed.

  The amount of water vapor sprayed in this embodiment is controlled by the measured value of the NOx measuring device 38 provided in the discharge part. When the measured value of NOx is high, the amount of water vapor sprayed is increased. For this reason, an optimal amount of water vapor can always be sprayed.

  It is efficient to generate steam by using surplus heat in the sludge fueling apparatus as a heat source and supply the steam to the steam supply line 35.

As described above, according to the first embodiment, since water vapor suppresses the generation of NOx during combustion in the combustion furnace, the release of NOx can be effectively avoided. Further, since the amount of water vapor sprayed is controlled by the measured value of the NOx measuring device 38, an appropriate amount of water vapor can always be sprayed. Furthermore, the sludge fueling device is advantageous in terms of cost without increasing its size.
1 and 2, the combustion furnace 7 is installed in the vertical direction, but may be installed in the horizontal direction.

(Second Embodiment)
FIG. 3 is a schematic view showing a configuration of a combustion furnace which is one configuration of the sludge fueling apparatus according to the second embodiment of the present invention. However, the same members as those in FIGS.
A reference numeral 41 in FIG. 3 indicates a urea water blowing spray nozzle that blows urea water along the urea injection line 42 into the combustion flame tip of the combustion furnace 7.

In the combustion furnace having such a configuration, the combustion process is performed in the combustion furnace 7 by the burner flame of the combustion burner 32 at a high temperature of 850 ° C. or more for 2 seconds or more. At this time, urea water is sprayed from the urea water spray nozzle 41 to a position near the tip of the burner flame.
Furthermore, the combustion furnace 7 of the present embodiment has a discharge unit 37 that discharges the final exhaust gas. The discharge unit 37 includes urea water according to the measured value of the NOx measuring device 38 that measures the NOx release amount of the final exhaust gas. The blowing flow rate is controlled.

The urea water reacts as follows in the combustion furnace to first generate ammonia gas.
CO (NH ₂ ) ₂ + H ₂ O → 2NH ₃ + CO ₂
And this ammonia gas reduces NOx in exhaust gas by reaction as follows.
4NO + 4NH ₃ + O ₂ → 4N ₂ + 6H ₂ O
Thereby, the NOx amount of the combustion exhaust gas can be suppressed.

  In the second embodiment, the spray flow rate of urea water is controlled by the measured value of the NOx measuring device 38 provided in the discharge unit. When the measured value of NOx is high, the urea water spray flow rate is increased. For this reason, it is possible to always spray an optimal amount of urea water.

  In addition, it is efficient to generate urea water using surplus heat in the sludge fueling apparatus as a heat source and supply it to the urea water blowing nozzle 41. This is because the urea water also becomes low temperature and the urea water easily crystallizes at low temperatures such as in winter, and the urea water injection line 42 may be blocked.

As described above, according to the second embodiment, during combustion of the pyrolysis gas, urea contained in the urea water reacts with NOx to reduce NOx to N ₂ , so that the reduction reaction is smoothly and reliably performed. Easy to progress. Moreover, since the spraying flow rate of urea water is controlled by the measured value of the NOx measuring device 38 provided in the discharge part, it is possible to always spray the optimal amount of urea water. Furthermore, it is efficient to heat the urea water using surplus heat in the sludge fueling apparatus as a heat source and supply it to the urea water blowing nozzle 41. Furthermore, the sludge fueling apparatus is advantageous in terms of cost without increasing the size.

(Third embodiment)
FIG. 4 is a schematic view showing a configuration of a combustion furnace which is one configuration of the sludge fueling apparatus in the third embodiment of the present invention. However, the same members as those in FIGS.
As shown in FIG. 4, the sludge fueling apparatus of the present embodiment is provided with a temperature measuring device 43 for measuring the temperature of the combustion exhaust gas discharge unit 37 instead of the NOx measuring device in the combustion exhaust gas discharge unit 37. FIG. 2 and FIG. 3 show the same configuration as the sludge fueling apparatus of the embodiment.

  In the present embodiment, when the temperature of the combustion exhaust gas discharge unit 37 is high, the remaining amount of NOx is utilized. When the temperature of the combustion exhaust gas discharge unit 37 is high, the steam blowing spray nozzle 36 Increase spraying flow rate.

  According to the third embodiment, the steam spraying flow rate can be controlled to an appropriate amount by using the measured value of the temperature measuring device 43 of the combustion exhaust gas discharge unit 37. Thus, since the spraying flow rate of water vapor is controlled by the temperature measurement value of the temperature measuring device 43 of the combustion exhaust gas discharge unit 37, it is possible to always spray an optimal amount of water vapor. Further, the temperature measuring device 43 has an advantage that it can be installed at a lower cost than the NOx measuring device. Furthermore, the sludge fueling device is advantageous in terms of cost without increasing its size.

  In addition, in 3rd Embodiment, although the case where the spraying flow rate of water vapor | steam was controlled to appropriate quantity was described, when it applies to the combustion furnace of FIG. 3 not only in this, the spraying flow rate of urea water is controlled to appropriate quantity. be able to.

Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] A pyrolysis carbonization furnace that generates pyrolysis gas and carbide by pyrolytic carbonization of sludge, and a combustion furnace having a combustion burner that burns the pyrolysis gas generated in the pyrolysis carbonization furnace, Combustion exhaust gas generated in a combustion furnace is used as a heat source for the pyrolysis carbonization furnace, and a spray nozzle for injecting water vapor is installed at the front end of the combustion flame of the combustion furnace so that NOx generated from the combustion furnace can be reduced. A sludge fueling device characterized by:
[2] The sludge fuelizer as set forth in [1], wherein the steam generated from the combustion exhaust gas at the front end of the combustion flame of the combustion furnace is the steam generated from the combustion exhaust gas as the heat source.
[3] The sludge fuel as set forth in [1] or [2], wherein the flow rate of water vapor sprayed to the front end of the combustion flame of the combustion furnace can be controlled based on the NOx measurement value of the combustion furnace exhaust gas. Device.
[4] The combustion exhaust gas discharge part of the combustion furnace is provided with a temperature measuring device for measuring the temperature of the combustion exhaust gas, and the flow rate of water vapor sprayed to the front end of the combustion flame is measured by the temperature measurement device for the combustion furnace exhaust gas. The sludge fueling apparatus according to any one of [1] to [3], wherein control is possible based on a value.
[5] A pyrolysis carbonization furnace that generates pyrolysis gas and carbide by pyrolytic carbonization of sludge, and a combustion furnace having a combustion burner that burns the pyrolysis gas generated in the pyrolysis carbonization furnace, Combustion exhaust gas generated in a combustion furnace is used as a heat source for the pyrolysis carbonization furnace, and a spray nozzle for injecting urea water at the front end of the combustion flame of the combustion furnace is installed to reduce NOx generated from the combustion furnace. A sludge fueling device characterized by that.
[6] The sludge fueling apparatus according to [5], wherein the flow rate of urea water sprayed on the combustion flame front end of the combustion furnace can be controlled based on the NOx measurement value of the combustion furnace exhaust gas.
[7] The combustion exhaust gas discharge section of the combustion furnace is provided with a temperature measuring device for measuring the temperature of the combustion exhaust gas, and the flow rate of urea water sprayed on the front end of the combustion flame is determined by the temperature measurement device for the combustion furnace exhaust gas. The sludge fuel conversion apparatus according to [5] or [6], wherein control is possible based on a measured value.
[8] The sludge fueling apparatus according to any one of [1] to [7], wherein the combustion furnace burns pyrolysis gas generated from the pyrolysis carbonization furnace at a high temperature of 850 ° C. or higher. .

FIG. 1 is a conceptual flow diagram of a sludge fueling apparatus according to a first embodiment of the present invention. FIG. 2 is a conceptual diagram of a combustion furnace that is one configuration of the sludge fueling apparatus according to the second embodiment of the present invention. FIG. 3 is a schematic configuration diagram of a combustion furnace which is one configuration of the sludge fueling apparatus according to the third embodiment of the present invention. FIG. 4 is a schematic configuration diagram of a combustion furnace which is one configuration of the sludge fueling apparatus according to the fourth embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sewage sludge, 2 ... Sludge input machine (input feeder), 3 ... Drying furnace (dryer), 4 ... Dry sludge input hopper, 5 ... Dry sludge input machine, 6 ... Pyrolysis carbonization furnace, 7 ... Combustion furnace, 8 ... Exhaust heat recovery boiler, 9 ... Carbide discharge duct, 11 ... Carbide cooler, 12 ... Carbide storage hopper, 14a ... First combustion exhaust gas line, 14b ... Second combustion exhaust gas line, 14c ... Combustion exhaust gas line, 17 DESCRIPTION OF SYMBOLS ... Hot-air circulation blower, 18 ... Cleaning apparatus, 19 ... Exhaust tower, 22 ... Exhaust line, 23 ... Hot-air suction blower, 32 ... Main burner, 33 ... Auxiliary burner, 36 ... Steam injection nozzle, 37 ... Combustion exhaust gas discharge part, 38 ... NOx measuring device, 41 ... urea water spray nozzle, 43 ... temperature measuring device.

Claims (6)

A pyrolysis carbonization furnace that generates pyrolysis gas and carbide by pyrolytic carbonization of sludge, and a combustion furnace having a combustion burner that burns the pyrolysis gas generated in the pyrolysis carbonization furnace, the combustion furnace The combustion exhaust gas generated in this way is used as a heat source for the pyrolysis carbonization furnace, and a spray nozzle for injecting water vapor into the combustion flame tip of the combustion furnace is installed, so that NOx generated from the combustion furnace can be reduced ,
The combustion exhaust gas discharge part of the combustion furnace is provided with a temperature measuring device for measuring the temperature of the combustion exhaust gas, and the flow rate of water vapor sprayed to the front end of the combustion flame is determined based on the measurement value of the temperature measurement device for the combustion furnace exhaust gas. A sludge fueling device characterized in that it can be controlled . The sludge fueling apparatus according to claim 1, wherein the water vapor sprayed on the front end of the combustion flame of the combustion furnace is water vapor generated from combustion exhaust gas as a heat source.   The sludge fueling apparatus according to claim 1 or 2, wherein the flow rate of water vapor sprayed to a combustion flame front end of the combustion furnace can be controlled based on a NOx measurement value of the combustion furnace exhaust gas. A pyrolysis carbonization furnace that generates pyrolysis gas and carbide by pyrolytic carbonization of sludge, and a combustion furnace having a combustion burner that burns the pyrolysis gas generated in the pyrolysis carbonization furnace, the combustion furnace The combustion exhaust gas generated in this way is used as a heat source for the pyrolysis carbonization furnace, and a spray nozzle for injecting urea water into the combustion flame tip of the combustion furnace is installed so that NOx generated from the combustion furnace can be reduced ,
The combustion exhaust gas exhaust section of the combustion furnace is provided with a temperature measuring device for measuring the temperature of the combustion exhaust gas, and the flow rate of urea water sprayed on the front end of the combustion flame is set to the measured value of the combustion furnace exhaust gas temperature measuring device. A sludge fueling device characterized in that it can be controlled based on the control . The sludge fueling apparatus according to claim 4 , wherein the flow rate of urea water sprayed on the front end of the combustion flame of the combustion furnace can be controlled based on the NOx measurement value of the combustion furnace exhaust gas. The sludge fueling apparatus according to any one of claims 1 to 5 , wherein the combustion furnace burns pyrolysis gas generated from the pyrolysis carbonization furnace at a high temperature of 850 ° C or higher.

Images