JP4839371B2 - Particle dryer and wet sludge incineration method and apparatus using particle dryer - Google Patents

Description

  The present invention relates to a dryer, a waste incineration apparatus, and a processing method, and more particularly to a wet sludge incineration processing apparatus and method using a particle dryer and a particle dryer.

  Sludge is a solid residue after sewage treatment, and the amount of sludge occupies about 3% to 5% (with a water content of 97%) of the sewage treatment amount. The amount of industrial and domestic sewage treatment in Japan is increasing rapidly, and a lot of sludge will be generated as sewage treatment plants are constantly built. The components of the sludge are very complex and contain not only a large amount of moisture, but also components such as ordinary organic matter, persistent organic matter, multiple trace elements, pathogenic microorganisms, parasitic eggs, and heavy metals. .

  The sludge treatment method that uses incineration as the core technology can satisfy the requirements of reduction, stabilization, and detoxification to the maximum. However, most of the conventional sludge incineration methods are pre-treated such as drying sludge using specialized equipment in advance and then incinerated, and drying and incineration are completed in two facilities. This complicates the system. The energy consumption of the drying equipment is large, the operation cost is high, and the demand for safety is high. If the dried sludge is easily incinerated, NOx is likely to be generated. Therefore, a denitrification device must be installed after the incinerator, and since the sludge contains sulfur, a desulfurization device must also be installed after the incinerator. I must. Thus, the sludge incineration system becomes complicated, and the detoxification processing cost increases.

  If wet sludge that has not been dried is directly added to the incinerator and incinerated, unit processes such as sludge drying, incineration, and smoke detoxification can be collected and performed simultaneously in a single device. Although the incineration process is simplified and the processing cost is reduced, the moisture contained in the wet sludge is discharged from the incineration chamber along with the high-temperature fumes generated by the incineration, and a large amount of heat is lost. In addition, it will be necessary to achieve energy balance.

  In the present invention, both the heat carrier and the wet sludge can be added, and the wet sludge and the heat carrier are directly mixed in the particle dryer, heat exchange is performed, and the wet sludge is heated to evaporate the water vapor therein. Provide a particle dryer that realizes drying, puts wet sludge into a fluidized state in the drying process, discharges evaporated water from the dryer along with flowing gas, and discharges the dried sludge and heat carrier together The purpose is to do.

  The present invention further combines sludge drying and incineration organically, collecting them in a single circulating fluidized bed apparatus, and the heat required to dry wet sludge is the combustion of sludge and auxiliary fuel. An object of the present invention is to provide a circulating fluidized bed wet sludge drying and incineration treatment method equipped with a particle dryer in which the sludge that is directly supplied from and dried and sent to a furnace is incinerated.

  Furthermore, the present invention is an integrated device that organically combines sludge drying and incineration, and heat that is required to dry wet sludge is released during the combustion of sludge and auxiliary fuel. An object of the present invention is to provide a circulating fluidized bed wet sludge drying and incineration treatment apparatus equipped with a particle dryer for incinerating dried and dried sludge directly in a furnace.

  The technical solution of the present invention is as follows.

  The structure of the particle dryer according to the present invention includes a chamber 600, a wet sludge addition port 609, an exhaust port 610, and a dry sludge outlet 611 are provided in the chamber 600, and a gas dispersion pipe 630 is provided in the lower portion of the chamber 600. Is installed horizontally, or a gas dispersion plate 620 provided with a nozzle 621 is attached, and a thermal ash inlet 613 is further provided in the chamber 600, and the thermal ash inlet 613 is located on the bottom wall or side wall of the chamber 600. .

  The dry sludge outlet 611 is provided in the middle of the outer wall facing the hot ash inlet 613 of the chamber 600. A vertical outlet partition wall 607 fixed on the bottom wall and both side walls of the chamber 600 is provided at the lower part of the chamber 600, and the outlet partition wall 607 includes the outlet chamber 604 and the thermal ash inlet 613. The dry sludge outlet 611 is provided at the bottom of the outlet chamber 604. The wet sludge addition port 609 is located on the side of the ceiling lid of the chamber 600 that is biased toward the thermal ash inlet 613. The exhaust port 610 is located on the side of the ceiling lid of the chamber 600 that is biased toward the dry sludge outlet 611. The chamber 600 is a bubbling fluidized bed having a flow rate of 0.3 to 0.8 m / s.

  The operation principle is as follows.

  The wet sludge is added from the wet sludge addition port 609 of the ceiling lid of the chamber 600 of the dryer, and the high-temperature hot ash entering from the hot ash inlet 613 supplies heat to the dryer, and the wet sludge flows in the falling process. Directly mixed with some hot ash, wet sludge is dried and granulated. Both the dried wet sludge and the cooled thermal ash are discharged from the dry sludge outlet 611, and the water evaporated from the wet sludge is discharged from the exhaust port 610 along with the flowing gas, and the exhaust is dedusted and dehumidified. After being performed, it is recycled as a flowing gas.

  The wet sludge drying and incineration processing method according to the present invention is a method of drying and incinerating wet sludge having a water content of 60 to 90% in a circulating fluidized bed incinerator or a circulating fluidized bed boiler, to form a circulating fluidized bed high-temperature circulating ash circuit. The high-temperature circulating ash separated from the centrifugal separator is partly returned directly to the furnace, the remaining part enters the particle dryer, and the wet sludge is mixed with the high-temperature circulating ash in the particle dryer. After being mixed directly, heated and dried to become a dried sludge having a moisture content of 5 to 20%, it is returned to the furnace together with the circulating ash and incinerated.

  The particle dryer is of a bubbling fluidized bed type and allows a flowing gas to pass through its bottom. The amount of high-temperature circulating ash entering the particle dryer is adjusted by a thermal ash distribution valve, and the exhaust temperature of the particle dryer is controlled to 80 to 150 ° C. In order to increase the total amount of circulating ash, an inert fluid medium is added to the circulation circuit, so that the adjusting ability of the thermal ash distribution valve with respect to the exhaust temperature of the particle dryer can be improved. The exhaust gas from the particle dryer is subjected to dust removal and dehumidification, and then sent to the particle dryer and circulated as a flowing gas, or sent to a furnace and incinerated.

  In the method of the present invention, a bubble fluidized bed type particle dryer is provided in a high-temperature circulating ash circulation circuit of a circulating fluidized bed incinerator or a circulating fluidized bed boiler, and centrifugal separation is performed by a mechanical or pneumatically controlled thermal ash distribution valve. Part of the high-temperature circulating ash separated from the machine is returned to the furnace through the return machine, and the remaining part is transferred to the particle dryer. The wet sludge having a moisture content of 60 to 90% is dispersed by a dispersing device and then added from a wet sludge addition port provided in the particle dryer. Adjusting the amount of high-temperature circulating ash of the particle dryer with a thermal ash distribution valve, controlling the exhaust temperature of the particle dryer to 80-150 ° C, ensuring that the wet sludge is not thermally decomposed and vaporized, and generating CO Suppresses explosions. In the particle dryer, the wet sludge is mixed directly with the circulating ash, heated, the contained moisture is evaporated, and the wet sludge is dried to a dried sludge having a moisture content of 5 to 20%. It is returned to the furnace with circulating ash by pneumatic method and incinerated. When wet sludge is dried and incinerated using a circulating fluidized bed incinerator with an insulated furnace, when the moisture content of the added wet sludge is lower than about 72% (specific values are determined by the properties of the wet sludge), It is not necessary to add auxiliary fuel, and simply incinerating the wet sludge can maintain a high temperature of 800-950 ° C. at which the furnace can completely burn the sludge. When the moisture content of wet sludge is higher than about 72% (specific values are determined by the properties of wet sludge), it is generally necessary to add auxiliary fuel such as coal, oil, gas, etc. A high temperature of 950 ° C. can be maintained. Since the dried sludge having a low water content is sent to the furnace and incinerated, only a small amount of water vapor is contained in the flue gas generated by the incineration, greatly reducing the heat exhausted from the furnace. Most of the water contained in the wet sludge is evaporated in the particle dryer and is drawn out of the ceiling lid with the flowing gas of the particle dryer. In the particle dryer exhaust, fine powder and dust are separated through a fine powder separator, condensed water is condensed by a cooler, pressurized by a blower, and sent to the particle dryer as a flowing gas of the particle dryer. It is recycled or sent to a furnace and incinerated. Fine powder and dust separated from the fine powder separator are sent to a furnace by a mechanical transport system or pneumatic system and incinerated, and condensed water condensed by a cooler is sent to a sewage treatment plant for processing.

  The method according to the present invention is also used for the mixed combustion of wet sludge in a normal circulating fluidized bed coal-fired boiler. In the circulating fluidized bed boiler, a particle dryer is added and the return machine is replaced with a hot ash distribution valve. A part of the hot ash is divided from the boiler high-temperature circulation circuit by the distribution valve and sent to the particle dryer. The wet sludge is added from the particle dryer and mixed directly with the wet sludge to dry the wet sludge. And circulating ash are both sent to the furnace and incinerated. The exhaust gas extracted from the particle dryer is dedusted and dehumidified, and is sent to a circulating use or furnace and incinerated.

  A wet sludge incineration treatment apparatus with a particle dryer according to the present invention comprises a circulating fluidized bed incinerator furnace 1, a high-temperature gas-solid separator 2, a terminal end flue 3, and a hot ash distribution, the upper part of which is sequentially communicated. A return valve 4, a sludge dispersion device 5, a particle dryer 6, and a dryer exhaust treatment system 7 including a fine powder separator 71, a cooler 72, a steam / water separator 73, and a blower 74 communicated with each other. Prepare.

  The hot ash distribution / return valve 4 is positioned below the high-temperature gas-solid separator 2, the inlet communicates with the separator foot 21, and the outlet communicates with the incinerator furnace 1 and the particle dryer 6, respectively. The structure is as follows.

  An upright flow dividing plate 402 is provided directly below the separator foot 21, and both sides of the upright flow dividing plate 402 are installed so that the upper portions thereof communicate with each other, and the bottom surface of the heat ash distribution return valve of the same horizontal altitude. The upright flow dividing plate 402 located in the first supply chamber 403 and the second supply chamber 405 divides the projections on the bottom surfaces of the first supply chamber 403 and the second supply chamber 405 of the separator foot 21 into two parts. In addition, a first shipping chamber 404 and a second shipping chamber 406 are provided, and a first overflow port 407 and a second overflow port 408 are provided above the first shipping chamber 404 and the second shipping chamber 406, respectively. The bottoms of the first overflow port 407 and the second overflow port 408 are located at the same horizontal height.

  The bottoms of the first supply chamber 403 and the first shipping chamber 404 are communicated with each other via a first horizontal hole 409, and the upper portion of the first shipping chamber 404 is communicated with the incinerator furnace 1 via a first overflow port 407. To do. The bottoms of the second supply chamber 405 and the second shipping chamber 406 communicate with each other through the second horizontal hole 410. The first horizontal hole 409 and the second horizontal hole 410 are located at the same horizontal height at the top end. The top end of the upright flow dividing plate 402 is not lower than the top end of the first horizontal hole 409 and is not higher than the bottom end of the first overflow port 407. Each of the first shipping chamber 404, the first supply chamber 403, the second supply chamber 405, and the second shipping chamber 406 is provided with a gas distribution plate with a nozzle on the bottom surface, and the first shipping chamber is located below the gas distribution plate. Corresponding air boxes are provided in the chamber 404, the first supply chamber 403, the second supply chamber 405, and the second shipping chamber 406, respectively, and flow air with adjustable flow rate is passed through the air box. A balanced wind tube 401 is communicated between the first shipping chamber 404 and the second shipping chamber 406.

  The particle dryer 6 is communicated with the hot ash distribution return valve 4 through the second overflow port 408, and its specific structure is as follows.

  An upright inlet partition wall 605 is provided at a location near the second overflow port 408 of the thermal ash distribution return valve 4 in the particle dryer 6, and an inlet chamber 601 through which the bottom portion communicates with the interior of the particle dryer 6. And the heat exchange chamber 602. The upper part of the inlet chamber 601 and the second overflow port 408 communicate with each other. Each of the inlet chamber 601 and the heat exchange chamber 602 is provided with a gas dispersion plate with a nozzle on the bottom surface, and a wind box corresponding to each of the inlet chamber 601 and the heat exchange chamber is provided below the gas dispersion plate. Pass the flow gas whose flow rate is adjustable. The flowing gas in the heat exchange chamber 602 is an inert gas or incinerator flue gas that has been cooled, and its flow rate is 0.4 to 1.5 m / s. A wet sludge addition port 609 is provided at a location near the top inlet chamber 601 of the heat exchange chamber 602, and an exhaust port 610 is provided at a location away from the top entrance chamber 601.

  The sludge disperser 5 is a mechanical or pneumatic sludge disperser and communicates with the particle dryer 6 through a wet sludge addition port 609.

A dry sludge outlet 611 is provided on the side away from the second overflow port 408 of the particle dryer 6, and the dry sludge outlet 611 is connected to the incinerator furnace 1 via the dry sludge return machine 612 or the first spiral feeder 614. Communicated with. The exhaust port 610 of the particle dryer 6 and the dryer exhaust processing system 7 are communicated with each other.

  The fine powder outlet of the fine powder separator 71 of the dryer exhaust treatment system 7 is connected to the incinerator furnace 1 via the fine powder return machine 711 or the second spiral feeder 712, and is separated from the dryer exhaust. The powder is sent to the incinerator furnace 1.

  The dry sludge outlet 611 is provided on the side wall away from the second overflow port 408 of the heat exchange chamber 602 of the particle dryer 6, and the heights of the bottom end and the bottom end of the second overflow port 408 are equal. The dry sludge outlet 611 communicates with the incinerator furnace 1 via the dry sludge return machine 612, and both the dried sludge and the cooled circulating ash are sent to the incinerator furnace 1 via the dry sludge return machine 612.

An outlet partition wall 607 parallel to the inlet partition wall 605 is provided on the heat exchange chamber 602 side away from the second overflow port 408 in the particle dryer 6, and the outlet chamber 604 is separated from the heat exchange chamber 602. A gas dispersion plate with a nozzle is provided on the bottom surface of the outlet chamber 604, a wind box corresponding to the outlet chamber 604 is provided below the gas dispersion plate, and a flowing gas whose flow rate is adjustable is passed through the wind box. The heat exchange chamber 602 and the outlet chamber 604 separated by the outlet partition wall 607 communicate with each other at the top. The heights of the top end of the outlet partition wall 607 and the bottom end of the second overflow port 408 are equal. The dry sludge outlet 611 is provided on the bottom surface of the outlet chamber 604, communicates with the incinerator furnace 1 via the first spiral feeder 614 , and both the dried sludge and the cooled circulating ash are supplied to the first spiral. It is sent to the incinerator furnace 1 via the machine 614 .

  The upright flow dividing plate 402 divides the projection on the bottom surfaces of the first supply chamber 403 and the second supply chamber 405 of the separator foot 21 into two parts, and the ratio of the area of these two parts is 0.25-4. 0.

  The outlet of the blower 74 of the dryer exhaust treatment system 7 is communicated with a wind box on the bottom surface of the heat exchange chamber 602 of the particle dryer 6 through a flowing gas pipe 741.

  A branch pipe 742 is provided at the outlet of the blower 74 of the dryer exhaust treatment system 7 and communicates with the incinerator furnace 1 through the branch pipe 742. An inert fluid medium addition port 713 is provided at the inlet of the fine powder return machine 711 or the second spiral feeder 712 of the dryer exhaust treatment system 7.

  The principle of the wet sludge incineration apparatus with a particle dryer of the present invention is as follows.

  The high-temperature circulating ash separated by the centrifugal separator of the circulating fluidized bed incinerator is distributed by the hot ash distribution return valve, a part is returned directly to the furnace, and the other part enters the particle dryer. The wet sludge having a moisture content of 60 to 90% is dispersed by a dispersing device and then added from a wet sludge addition port provided in the particle dryer. The particle dryer is a bubble fluidized bed type. Fluid gas is passed through the bottom, hot circulating ash and wet sludge separated into the particle dryer are directly mixed by the hot ash distribution return valve, and the wet sludge is heated and dried. Is done.

  By adjusting the flow velocity of the first supply chamber, second supply chamber, second shipping chamber, and second shipping chamber of the thermal ash distribution and return valve, the circulating ash returns directly to the furnace and enters the particle dryer. The amount of high-temperature circulating ash entering the particle dryer is controlled, the exhaust temperature of the particle dryer is controlled to 80 to 150 ° C., and sufficient heat is provided to provide wet sludge with a moisture content of 5 to 20%. It is dried until it becomes, and sent to the furnace with circulating ash by a return machine for incineration.

  When the altitudes of the direct return of the thermal ash and the dry sludge return are not equal, the gas pressures of the first overflow port and the second overflow port are not equal, and the circulating ash returns directly to the furnace at the position of the diverting plate Balance the flow resistance between the two paths of entering the particle dryer. When the hot ash direct return port is higher than the dry sludge return port, the pressure of the first overflow port is low, and the shunt plate has two projections on the bottom of the first supply chamber and the second supply chamber of the separator foot. In other words, the area ratio of the two parts should be less than 1, otherwise it is more than 1.

  Most of the water contained in the wet sludge is evaporated in the particle dryer and is drawn from the top of the particle dryer with the dryer flowing gas. In the particle dryer exhaust, fine powder and dust are separated by a fine powder separator, condensed water is condensed by a cooler, pressurized by a blower, and sent to the particle dryer as a flowing gas of the particle dryer. It is recycled and part is sent to the furnace and incinerated. The fine powder and dust separated by the fine powder separator are sent to the furnace for incineration by the mechanical transport method or pneumatic method, and the condensed water condensed by the cooler is sent to the sewage treatment plant for processing. .

  The wet sludge drying process is carried out in a particle dryer, and the wet sludge is dried by the sludge produced by the high-temperature circulating ash and the heat generated by the combustion of the auxiliary fuel. The wet sludge has a moisture content of 5 to 20%. It is dried to particulate dry sludge, returned to the furnace with circulating ash and incinerated, and only a small amount of water vapor is contained in the high-temperature exhaust gas generated by the incineration. Most of the moisture in the wet sludge is discharged in the form of water vapor from the outlet of the particle dryer, and the water vapor is condensed into water in the cooler and sent to the sewage treatment plant where it can be treated for dust removal and dehumidification. The exhaust gas from the particle dryer can be used in a closed circulation, can be sent to a furnace for incineration, and the gas with a strange odor generated in the sludge drying can be prevented from being discharged to the outside. .

  The particle dryer according to the present invention has the following advantages.

  Wet sludge is directly exchanged with hot ash in a fluidized state in a particle dryer, and the wet sludge is heated by fully utilizing the heat of the hot ash, and the moisture in the wet sludge is evaporated and dried. The water achieved and evaporated is discharged from the dryer with the flowing gas in the form of water vapor. Thus, wet sludge having a high water content is quickly dried to a water content of 20% or less, and both the dried sludge and the hot ash can be discharged from the particle dryer and immediately sent to an incinerator for incineration. .

  The circulating fluidized bed wet sludge drying incineration processing method and apparatus with a particle dryer according to the present invention have the following advantages. Regardless of the mode in which the two processes are performed independently after drying in advance, the drying and incineration of sludge is organically combined and performed in a single device to perform the drying and incineration process of wet sludge. Simplify greatly and simplify the drying incinerator. The heat required to dry the wet sludge is supplied directly from the combustion of the sludge and auxiliary fuel, bringing the hot particles and the wet sludge into direct contact in the particle dryer and mixing them well to enhance heat conduction. Let the wet sludge be heated and dried quickly. The incinerator adopts a circulating fluidized combustion method, and has a function of suppressing NOx generation and desulfurization. Most of the moisture contained in the wet sludge is not discharged with the high temperature flue gas generated by combustion, but is concentrated in the low temperature gas discharged from the particle dryer, reducing the heat loss of the system and incinerator The amount of auxiliary fuel consumed was reduced, or the upper limit of wet sludge moisture content, which was dried and incinerated without adding auxiliary fuel, was improved. The gas generated in the drying of the wet sludge is recycled after use or sent to a furnace or incinerated to prevent the discharge of gas with a strange odor during the treatment process.

  The particle dryer and wet sludge incineration apparatus with particle dryer according to the present invention can be used for drying waste with high water content such as sludge, for example, sewage sludge, papermaking sludge, petrochemical industry sludge, etc. It can also be used to dry concentrated permeate in a landfill.

Example 1
The particle dryer of Example 1 includes the following structure.

  The rectangular parallelepiped chamber 600 has a gas dispersion pipe 630 attached horizontally to the lower portion of the chamber, and a vertical outlet partition wall 607 provided in the lower portion of the chamber. The outlet partition wall 607 serves as a heat exchange chamber. It is divided into 602 and an exit chamber 604. The heat exchange chamber 602 is provided with a thermal ash inlet 613 and a wet sludge addition port 609. An exhaust port 610 is provided in the ceiling lid of the outlet chamber 604, and a dry sludge outlet 611 is provided at the bottom. The thermal ash inlet 613 is located at one end away from the outlet partition wall 607 of the bottom plate of the heat exchange chamber 602, and the number is two. The wet sludge addition port 609 is positioned on one side of the heat exchange chamber 602 that is biased toward the thermal ash inlet 613 of the ceiling lid. The exhaust port 610 is located on one side of the outlet cover 604 that is biased toward the dry sludge outlet 32 of the ceiling lid. The flow rate of the heat exchange chamber 602 is 0.5 m / s, the flow rate of the outlet chamber 604 is 0.4 m / s, and both are bubble fluidized beds. The wet sludge is added from the wet sludge addition port 609, and the dry sludge is discharged from the dry sludge outlet 611 along with the cooled thermal ash.

Example 2
The particle dryer of Example 2 includes the following structure.

  A columnar chamber 600 having an oval cross section has a gas dispersion plate 620 attached horizontally to a lower portion of the chamber, and a nozzle 621 is provided on the gas dispersion plate 620. The chamber below the gas dispersion plate 620 is a fluidized air box 622, and the chamber 600 is a bubble fluidized bed. The chamber 600 is provided with a wet sludge addition port 609, an exhaust port 610, a thermal ash inlet 613, and a dry sludge outlet 611. The thermal ash inlet 613 is located on the side wall of the chamber 600, and the dry sludge outlet 611 is located in the middle of the side wall facing the thermal ash inlet 613. The wet sludge addition port 609 is located on one side of the ceiling 600 of the chamber 600 that is biased toward the thermal ash inlet 11. The exhaust port 610 is located on one side of the ceiling cover of the chamber 600 that is biased toward the dry sludge outlet 611. The flow rate of the chamber 600 is 0.8 m / s. The permeate in the landfill is added from the wet sludge addition port 609, and the residual residue of the dried permeate is discharged from the dry sludge outlet 611 together with the cooled hot ash.

Example 3
FIG. 5 is a schematic diagram of the third embodiment. According to the figure, the wet sludge incineration treatment method with a particle dryer of Example 3 is a dry sludge incineration of wet sludge A having a moisture content of 60% in a circulating fluidized bed incinerator. It adds from the wet sludge addition port 609 provided in the particle | grain dryer 6, and when adding, it disperse | distributes with the dispersion apparatus 5 provided in the addition port 609. The particle dryer 6 is provided in the circulating ash circulation circuit of the circulating fluidized bed incinerator, and the high-temperature circulating ash separated by the centrifugal separator 2 passes through the mechanical thermal ash distribution valve 41, and a part thereof is a return machine 42. Enter and return directly to the furnace 1, the other part enters the particle dryer 6. The particle dryer 6 is a bubbling fluidized bed type and passes a flowing gas through the bottom. An inert fluid medium is added from the lower part of the furnace 1, the total circulation amount is increased, the amount of high-temperature circulating ash entering the particle dryer 6 is adjusted by the thermal ash distribution valve 41, and the temperature of the particle dryer exhaust C is about 80 ° C. To control. The wet sludge A is directly mixed with the circulating ash in the particle dryer 6, heated, and the contained water is evaporated, and the wet sludge A is dried to the dried sludge B having a moisture content of 20%. Then, it is returned to the furnace 1 by a pneumatic method together with circulating ash and incinerated. The particle dryer exhaust C is drawn from the top, the dust D is separated by the fine powder separator 71, the condensed water E is condensed by the cooler 72, and then pressurized by the blower 74, and the flow of the particle dryer It is sent to the particle dryer 6 as gas and used in circulation. The fine powder D separated by the fine powder separator 71 is sent to the furnace 1 and incinerated, and the condensed water E condensed by the cooler 72 is sent to the sewage treatment plant for processing.

Example 4
FIG. 6 is a schematic diagram of the fourth embodiment. According to the figure, the wet sludge incineration treatment method with a particle dryer of Example 4 adds coal as an auxiliary fuel to a circulating fluidized bed incinerator and dry-incinerates wet sludge A having a moisture content of 90%. Then, the wet sludge A is added from the wet sludge addition port 609 provided in the particle dryer 6, and is dispersed by the dispersing device 5 provided in the addition port 609 when added. The particle dryer 6 is provided in the circulating ash circulation circuit of the circulating fluidized bed incinerator, and the high-temperature circulating ash separated by the centrifugal separator 2 is partly passed through the thermal ash distribution valve 41 by an air pressure control type. , Enters the return machine 42 and returns directly to the furnace 1, and the other part enters the particle dryer 6. The particle dryer 6 is a bubbling fluidized bed type and passes a flowing gas through the bottom. The amount of high-temperature circulating ash entering the particle dryer 6 is adjusted by the thermal ash distribution valve 41, and the temperature of the particle dryer exhaust C is controlled to about 120 ° C. The wet sludge A is directly mixed with the circulating ash in the particle dryer 6 and heated, and the contained moisture is evaporated, and the wet sludge A is dried to the dried sludge B having a moisture content of 15%. Then, it is returned to the furnace 1 by the mechanical transport system together with the circulating ash and incinerated. The particle dryer exhaust C is drawn out from the top, the dust D is separated by the fine powder separator 71, the condensed water E is condensed by the cooler 72, and then pressurized by the blower 74 and sent to the furnace 1. Incinerated. The fine powder D separated by the fine powder separator 71 is sent to the furnace 1 and incinerated, and the condensed water E condensed by the cooler 72 is sent to the sewage treatment plant for processing.

Example 5
7 and 8 are schematic structural diagrams of Example 5. FIG. According to the figure, the wet sludge incinerator with particle dryer of Example 5 is a circulating fluidized bed incinerator furnace 1, a high-temperature gas-solid separator 2, a terminal flue 3, a hot ash distribution valve 4, a sludge dispersion. A device 5, a particle dryer 6, and a dryer exhaust treatment system 7 (including a fine powder separator 71, a cooler 72, a steam / water separator 73 and a blower 74) are provided.

  The thermal ash distribution valve 4 is located below the separator 2, the inlet and the separator foot 21 are connected, the outlet is connected to the incinerator furnace 1 and the particle dryer 6, respectively. It is the following.

  An upright flow dividing plate 402 is provided directly below the separator foot 21, and both sides thereof are a first supply chamber 403 and a second supply chamber 405 of a thermal ash distribution valve, both of which communicate with each other at the top. Are the same horizontal altitude, and the flow dividing plate 402 divides the projections on both bottom surfaces of the separator foot 21 into two parts. The first supply chamber 403 and the first shipping chamber 404 communicate with each other at the bottom via the first horizontal hole 409, and the upper portion of the first shipping chamber 404 communicates with the incinerator furnace via the first overflow port 407. The The bottoms of the second supply chamber 405 and the second shipping chamber 406 communicate with each other via the second horizontal hole 410, and a second overflow port 408 is provided in the upper portion of the second shipping chamber 406. The first overflow port 407 and the second overflow port 408 are located at the same horizontal height at the bottom end. The first horizontal hole 409 and the second horizontal hole 410 are located at the same horizontal height at the top end. The first shipping chamber 404, the first supply chamber 403, the second supply chamber 405, and the second shipping chamber 406 are all gas distribution plates with nozzles on the bottom surface, and the lower portions thereof correspond to the air boxes, respectively, Pass adjustable fluid gas. The first shipping chamber 404 and the second shipping chamber 406 are connected by a balanced wind tube 401.

  The top end of the flow dividing plate 402 and the first overflow port 407 have the same height at the bottom end. The flow dividing plate 402 divides the projection on the bottom surfaces of the first supply chamber 403 and the second supply chamber 405 of the separator foot 21 into two parts, and the ratio of the areas of these two parts is 0.25.

  The second overflow port 408 of the thermal ash distribution valve 4 and the particle dryer 6 communicate with each other, and the specific structure of the particle dryer 6 is as follows.

  An upright inlet partition wall 605 is provided at a location near the second overflow port 408 of the thermal ash distribution valve 4 in the particle dryer 6 and divides the interior of the particle dryer 6 into an inlet chamber 601 and a heat exchange chamber 602. The second overflow port 408 and the inlet chamber 601 communicate with each other at the top, the inlet chamber 601 and the heat exchange chamber 602 are separated by the inlet partition wall 605, and the bottoms communicate with each other. The bottom surfaces of the inlet chamber 601 and the heat exchange chamber 602 are both gas-dispersed plates with nozzles, and the lower portions of the inlet chamber 601 and the heat exchange chamber 602 respectively correspond to the wind boxes and allow flowable gas to flow through. The flowing gas in the heat exchange chamber 602 is an inert gas, and the flow rate is 0.4 m / s. A wet sludge addition port 609 is provided at a location near the entrance chamber 601 at the top of the heat exchange chamber 602, and an exhaust port 610 is provided at a location away from the entrance chamber 601.

  A mechanical sludge dispersing device 5 is provided above the wet sludge addition port 609 of the particle dryer 6, and the sludge after being dispersed falls directly into the particle dryer 6.

  A dry sludge outlet 611 is provided on the side wall of the particle dryer 6 away from the inlet chamber 601 of the heat exchange chamber 602, and the bottom end of the dry sludge outlet 611 and the bottom end of the second overflow port 408 have the same altitude. The dry sludge outlet 611 is connected to the incinerator furnace 1 via the dry sludge return machine 612, and both the dried sludge and the cooled circulating ash are sent to the incinerator furnace 1 via the dry sludge return machine 612. .

  The exhaust port 610 of the particle dryer 6 is connected to the dryer exhaust processing system 7, and the outlet of the blower 74 of the dryer exhaust processing system 7 is connected to the heat exchange chamber 602 of the particle dryer 6 via the flowing gas pipe 741. It is connected to the bottom wind box and connected to the incinerator furnace 1 via the branch pipe 742.

  The fine powder outlet of the fine powder separator 71 communicates with the incinerator furnace 1 through the second spiral feeder 712 and sends the sludge fine powder separated from the dryer exhaust to the incinerator furnace 1. An inert fluid medium addition port 713 is provided at the inlet of the second spiral feeder 712, and an inert fluid medium such as sand is added during operation to improve the transport property and fluid property of the sludge fine powder.

Example 6
9 and 10 are structural schematic diagrams of Example 6. FIG. According to the figure, the wet sludge incineration apparatus with particle dryer of Example 6 is a circulating fluidized bed incinerator furnace 1, a high-temperature gas-solid separator 2, a terminal flue 3, a thermal ash distribution valve 4, a sludge dispersion. A device 5, a particle dryer 6, and a dryer exhaust treatment system 7 (including a fine powder separator 71, a cooler 72, a steam / water separator 73 and a blower 74) are provided.

  The thermal ash distribution valve 4 is located below the separator 2, the inlet is connected to the separator foot 21, and the outlets are connected to the incinerator furnace 1 and the particle dryer 6, respectively. It is the following.

  An upright flow dividing plate 402 is provided directly below the separator foot 21, and both sides thereof are a first supply chamber 403 and a second supply chamber 405 of a thermal ash distribution valve, both of which communicate with each other at the top. Are the same horizontal altitude, and the flow dividing plate 402 divides the projections on both bottom surfaces of the separator foot 21 into two parts. The first supply chamber 403 and the first shipping chamber 404 communicate with each other at the bottom via the first horizontal hole 409, and the upper portion of the first shipping chamber 404 communicates with the incinerator furnace via the first overflow port 407. The The bottoms of the second supply chamber 405 and the second shipping chamber 406 communicate with each other via the second horizontal hole 410, and a second overflow port 408 is provided in the upper portion of the second shipping chamber 406. The first overflow port 407 and the second overflow port 408 are located at the same horizontal height at the bottom end. The first horizontal hole 409 and the second horizontal hole 410 are located at the same horizontal height at the top end. The first shipping chamber 404, the first supply chamber 403, the second supply chamber 405, and the second shipping chamber 406 are all gas distribution plates with nozzles on the bottom surface, and the lower portions thereof correspond to the air boxes, respectively, Pass adjustable fluid gas. The first shipping chamber 404 and the second shipping chamber 406 are connected by a balanced wind tube 401. The top end of the flow dividing plate 402 is not lower than the top end of the first horizontal hole 409 and is not higher than the bottom end of the first overflow port 407. The flow dividing plate 402 bisects the projected area on the bottom surfaces of the first supply chamber 403 and the second supply chamber 405 of the separator foot.

  The second overflow port 408 of the thermal ash distribution valve 4 and the particle dryer 6 communicate with each other, and the specific structure of the particle dryer 6 is as follows.

  An upright inlet partition wall 605 is provided at a location near the second overflow port 408 of the thermal ash distribution valve 4 in the particle dryer 6 and divides the interior of the particle dryer 6 into an inlet chamber 601 and a heat exchange chamber 602. The second overflow port 408 and the inlet chamber 601 communicate with each other at the top, the inlet chamber 601 and the heat exchange chamber 602 are separated by the inlet partition wall 605, and the bottoms communicate with each other. The bottom surfaces of the inlet chamber 601 and the heat exchange chamber 602 are both gas-dispersed plates with nozzles, and the lower portions of the inlet chamber 601 and the heat exchange chamber 602 respectively correspond to the wind boxes and allow flowable gas to flow through. The flowing gas in the heat exchange chamber 602 is an inert gas, and the flow rate is 1.5 m / s. A wet sludge addition port 609 is provided at a location near the entrance chamber 601 at the top of the heat exchange chamber 602, and an exhaust port 610 is provided at a location away from the entrance chamber 601.

  The pneumatic sludge dispersion device 5 is provided above the wet sludge addition port 609 of the particle dryer 6, and the dispersed sludge falls directly into the particle dryer 6.

An outlet partition wall 607 parallel to the inlet partition wall 605 is provided on one side away from the second overflow port 408 of the particle dryer 6, and the outlet chamber 604 is partitioned, and the bottom surface is a gas dispersion plate with a nozzle. Yes, the lower part corresponds to the wind box and allows the flow gas to be adjusted. The heat exchange chamber 602 and the outlet chamber 604 are separated by an outlet partition wall 607, and the upper portions of both are communicated. The top end of the outlet partition wall 607 and the bottom end of the second overflow port 408 have the same altitude. Dry sludge outlet 611 provided on the bottom surface of the outlet chamber 604 is connected to the incinerator furnace 1 through the first spiral feeder 614, it is cooled and dried sludge circulation ash, both first spiral feeder 614 And then sent to the incinerator furnace 1.

  The exhaust port 610 of the particle dryer 6 is connected to the dryer exhaust processing system 7, and the outlet of the blower 74 of the dryer exhaust processing system 7 is connected to the heat exchange chamber 602 of the particle dryer 6 via the flowing gas pipe 741. Connected to the bottom wind box.

  The fine powder outlet of the fine powder separator 71 communicates with the incinerator furnace 1 through the fine powder return machine 711 and sends the sludge fine powder separated from the dryer exhaust to the incinerator furnace 1.

It is a schematic diagram of the particle | grain dryer of Example 1 of this invention. It is AA sectional drawing of the particle | grain dryer of Example 1 of this invention. It is a schematic diagram of the particle | grain dryer of Example 2 of this invention. It is BB sectional drawing of the particle | grain dryer of Example 2 of this invention. It is a schematic diagram of the wet sludge incineration processing method with a particle dryer of Example 3 of this invention. It is a schematic diagram of the wet sludge incineration processing method with a particle dryer of Example 4 of this invention. It is a schematic diagram of the wet sludge incineration processing apparatus with a particle dryer of Example 5 of this invention. It is a schematic diagram of the thermal ash distribution valve | bulb and particle | grain dryer of the wet sludge incineration processing apparatus with a particle dryer of Example 5 of this invention. It is a schematic diagram of the wet sludge incineration processing apparatus with a particle dryer of Example 6 of this invention. It is a schematic diagram of the thermal ash distribution valve | bulb and particle | grain dryer of the wet sludge incineration processing apparatus with a particle dryer of Example 6 of this invention.

Claims (29)

A chamber (600) for directly mixing wet sludge and fluidized hot ash;
A wet sludge addition port (609) for putting wet sludge into the chamber (600);
A thermal ash inlet (613) for placing thermal ash into the chamber (600);
An exhaust port (610) for exhausting the gas in the chamber (600);
A dry sludge outlet (611) for discharging dried sludge and cooled thermal ash from the chamber (600) ;
An upright entrance partition wall (605) is provided in the chamber (600), and the entrance partition wall (605) is connected to the interior of the chamber (600) with an entrance chamber (601) whose bottoms communicate with each other. The particle dryer which divides | segments into a heat exchange chamber (602) for mixing wet sludge and the thermal ash which is a fluid state directly .   The chamber (600) is a bubble fluidized bed having a flow rate of 0.3 to 0.8 m / s or 0.4 to 1.5 m / s, and the bottom of the chamber is a gas dispersion pipe (630) or a nozzle. The particle dryer according to claim 1, wherein gas dispersion is performed by a gas dispersion plate (620) with (621).   The particle dryer according to claim 1, wherein the thermal ash inlet (613) is located on a bottom wall or a side wall of the chamber (600).   The particle dryer according to claim 1, wherein the wet sludge addition port (609) is located on a side of the ceiling lid of the chamber (600) that is biased toward the thermal ash inlet (613).   The particle dryer according to claim 3, wherein the dry sludge outlet (611) is located in the middle of the side wall facing the hot ash inlet (613) of the chamber (600).   At the lower part of the chamber (600), an upright outlet partition wall (607) fixed on the bottom wall and both side walls of the chamber (600) is provided, and the outlet partition wall (607) is connected to the chamber (600). The upper part is divided into an outlet chamber (604) and a heat exchange chamber (602) with a thermal ash inlet (613), and the dry sludge outlet (611) is provided at the bottom of the outlet chamber (604), A gas dispersion plate with a nozzle is provided on the bottom surface of the outlet chamber (604), and an air box corresponding to the outlet chamber (604) is provided below the gas dispersion plate, and the flow rate can be adjusted in the air box. The particle dryer according to claim 1, wherein a flowing gas is passed through.   The particle dryer according to claim 5 or 6, wherein the exhaust port (610) is located on a side of the ceiling lid of the chamber (600) that is biased toward the dry sludge outlet (611). Entering-port chamber (601), a gas distribution plate with nozzles provided on the bottom surface, below the gas distribution plate, windbox corresponding to the inlet chamber (601) is provided, the windbox, the flow rate can be adjusted The particle dryer according to claim 1, wherein a flowing gas is passed through. A method for drying and incinerating wet sludge, wherein the wet sludge is dried and incinerated in a circulating fluidized bed incinerator or a circulating fluidized bed boiler,
A circulating fluidized bed high-temperature circulating ash circuit is provided with the particle dryer according to any one of claims 1 to 8,
The high-temperature circulating ash separated from the centrifuge is partly returned directly to the furnace and the remaining part enters the particle dryer,
Wet sludge is sent to a particle dryer, mixed directly with the high-temperature circulating ash, heated and dried, then returned to the furnace together with the circulating ash, and incinerated. .   The wet sludge has a moisture content of 60 to 90%, and the wet sludge is dried to a dried sludge having a moisture content of 5 to 20% in a particle dryer, and then returned to the furnace together with circulating ash. The method for drying and incinerating wet sludge according to claim 9, wherein the method is incinerated. Adjusting the amount of high-temperature circulating ash entering the particle dryer with a thermal ash distribution valve, controlling the exhaust temperature of the particle dryer to 80-150 ° C , ensuring that no thermal decomposition or vaporization occurs in the wet sludge, The method for drying and incinerating wet sludge according to claim 9, wherein generation is suppressed and explosion is prevented . 10. The adjusting power of the thermal ash distribution valve with respect to the exhaust temperature of the particle dryer is improved by adding an inert fluidized medium from the bottom of the furnace to increase the total circulating ash amount. A method for drying and incinerating wet sludge. A circulating fluidized-bed incinerator furnace (1), a high-temperature gas-solid separator (2), and an end flue (3) communicated at the top;
A particle dryer (6) according to claims 1-8;
Located below the high-temperature gas-solid separator (2), the inlet communicates with a communication pipe (21) provided at the lower part of the high-temperature gas-solid separator (2), and the outlet is the heat of the particle dryer (6). A thermal ash distribution return valve (4) communicated with the ash inlet (613),
A wet sludge incineration apparatus characterized in that a dry sludge outlet (611) of the particle dryer (6) communicates with a furnace (1).   14. The wet sludge incineration apparatus according to claim 13, wherein the thermal ash distribution return valve (4) further comprises an outlet communicating with the furnace (1) of the incinerator.   The wet sludge incineration processing apparatus further includes a dryer exhaust treatment system (7), and the exhaust port (610) of the particle dryer (6) is connected to the exhaust treatment system (7) of the dryer. The wet sludge incineration processing apparatus according to claim 13. The dryer exhaust treatment system (7) includes a fine powder separator (71), a cooler (72), a steam / water separator (73), and a blower (74) communicated sequentially.
The fine powder outlet of the fine powder separator (71) communicated with the incinerator furnace (1) via the fine powder return machine (711) or the second spiral feeder (712) and was separated from the dryer exhaust. The wet sludge incineration apparatus according to claim 15, wherein the sludge fine powder is sent to an incinerator furnace (1).   The wet sludge incineration processing apparatus further includes a sludge dispersion device (5), and the sludge dispersion device (5) communicates with the particle dryer (6) through a wet sludge addition port (609). The wet sludge incineration processing apparatus according to claim 13. In the thermal ash distribution / return valve (4), an upright flow dividing plate (402) is provided immediately below the communication pipe (21), and the upright flow dividing plate (402) is a hot ash whose upper part communicates with both sides. A first supply chamber (403) and a second supply chamber (405) for the distribution return valve are provided, and a first shipping chamber (404) and a second shipping chamber (406) are provided in the thermal ash distribution return valve (4). In addition, a first overflow port (407) and a second overflow port (408) are provided above the first shipping chamber (404) and the second shipping chamber (406), respectively. The bottom of the chamber (403) and the first shipping chamber (404) communicate with each other through the first horizontal hole (409), and the bottom of the second supply chamber (405) and the second shipping chamber (406) Two horizontal holes (410) communicate with each other, and the first shipping chamber (404) is connected to the first overflow port (4 7) is communicated with the incinerator furnace (1) through the second overflow port (408) is communicated with the hot ash inlet (613) of the particle dryer (6), and the upright flow dividing plate (402) Divides the projection on the bottom surface of the first supply chamber (403) and the second supply chamber (405) of the communication pipe (21) into two parts, and the ratio of the area of the two parts is 0.25-4. The first shipping chamber (404), the first supply chamber (403), the second supply chamber (405), and the second shipping chamber (406) are all provided with a gas distribution plate with a nozzle on the bottom surface. A wind box corresponding to each of the first shipping chamber (404), the first supply chamber (403), the second supply chamber (405), and the second shipping chamber (406) is provided below the gas dispersion plate. 15. The wet sludge incineration process according to claim 14, wherein fluidized air whose flow rate is adjustable is passed through the wind box. Science device.   In the thermal ash distribution return valve (4), the bottom surfaces of the first supply chamber (403) and the second supply chamber (405) are located at the same horizontal altitude, and the first overflow port (407) and the first supply chamber (405) The bottom ends of the two overflow ports (408) are located at the same horizontal height, and the top ends of the first horizontal hole (409) and the second horizontal hole (410) are located at the same horizontal height. The wet sludge incineration processing apparatus according to claim 18.   In the thermal ash distribution return valve (4), the top end of the upright flow dividing plate (402) is not lower than the top end of the first horizontal hole (409) and is not higher than the bottom end of the first overflow port (407). The wet sludge incineration processing apparatus according to claim 18. The particle drier (6), upstanding inlet partition wall (605) is provided, the inlet partition wall (605) is closer to the second overflow outlet of the heat ash distribution return valve (4) (408) The inlet chamber (601) is separated from the interior of the particle dryer (6), and the inlet chamber (601) and the heat exchange chamber (602) are separated by an inlet partition wall (605), both of which are at the bottom And a gas dispersion plate with a nozzle is provided on the bottom surface of the inlet chamber (601), and a wind box corresponding to the inlet chamber (601) is provided below the gas dispersion plate. The wet sludge incineration processing apparatus according to claim 18, wherein an adjustable flowing gas is passed.   The dry sludge outlet (611) is provided on the side wall away from the hot ash inlet (613) of the particle dryer (6), and the bottom end of the dry sludge outlet (611) and the bottom end of the second overflow outlet (408) are equal in height. By connecting the dry sludge return machine (612) and the incinerator furnace (1), both the dried sludge and the cooled circulating ash pass through the dry sludge return machine (612) and the incinerator furnace (1). The wet sludge incineration processing apparatus according to claim 19, wherein the wet sludge incineration processing apparatus is sent to the incinerator and incinerated.   The dry sludge outlet (611) is provided at one end away from the thermal ash inlet (613) on the bottom surface of the heat exchange chamber (602) of the particle dryer (6), and is connected to the first spiral feeder (613) and the incinerator. By connecting the furnace (1), the dried sludge and the cooled circulating ash are both sent to the incinerator furnace (1) via the first spiral feeder (613). 13. The wet sludge incineration processing apparatus according to 13. A heat exchange chamber (602) of the particle drier (6), an inlet partition wall (60 5) provided with parallel outlet partition wall (607), the outlet chamber (604) is separated, said outlet partition The outlet chamber (604) partitioned by the wall (607) and the upper part of the heat exchange chamber (602) communicate with each other, and a gas distribution plate with a nozzle is provided on the bottom surface of the outlet chamber (604). A wind box corresponding to the outlet chamber (604) is provided below, and a flowing gas whose flow rate is adjustable is passed through the wind box, and the dry sludge outlet (611) is formed on the bottom surface of the outlet chamber (604). The dry sludge outlet (611) is connected to the incinerator furnace (1) via the first spiral feeder (613), and the dried sludge and the cooled circulating ash are both in the first spiral feeder. Sent to incinerator (1) via (613) Wet sludge incinerator according to claim 21, wherein the Rukoto.   The wet sludge incineration apparatus according to claim 24, wherein the height of the top end of the outlet partition wall (607) and the bottom end of the second overflow port (408) is equal.   The outlet of the blower (74) of the dryer exhaust system (7) is communicated with the wind box at the bottom of the heat exchange chamber (602) of the particle dryer (6) via the flowing gas pipe (741). The wet sludge incineration processing apparatus according to claim 16,   17. The wet sludge incinerator according to claim 16, wherein the outlet of the blower (74) of the dryer exhaust treatment system (7) communicates with the incinerator furnace (1) by a branch pipe (742). .   The inert fluid medium addition port (713) is provided at the inlet of the fine powder return machine (711) or the second spiral feeder (712) of the dryer exhaust treatment system (7). The wet sludge incineration processing apparatus described in 1.   The wet sludge incineration apparatus according to claim 13, wherein the fluid gas in the heat exchange chamber (602) is an inert gas or a cooled incinerator flue gas.

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