WO2006136105A1

WO2006136105A1 - A combined dryer and a method and an equipment for incinerating the wet sludge with the combined dryer

Info

Publication number: WO2006136105A1
Application number: PCT/CN2006/001415
Authority: WO
Inventors: Qinggang Lv; Yongjie Na; Ming Gao; Weihong Jiao; Shaolin Bao; Xiaoyin Yun; Yunkai Sun; Jun He; Renxiong Ma; Dongyu Wang; Yumei Yong
Original assignee: Institute Of Engineering Thermophysics, Chinese Academy Of Sciences
Priority date: 2005-06-21
Filing date: 2006-06-21
Publication date: 2006-12-28
Also published as: JP2008543547A; JP4755250B2

Abstract

The present invention provides a combined dryer and a method and an equipment for incinerating wet sludge with the combined dryer. The reactor chamber of the dryer is divided into two chambers, and two kinds of heat carriers heat the wet sludge. In the dryer, the wet sludge exchanges heat with the first eat carrier directly and with the second one indirectly. During the drying, the wet sludge in fluidized (state is heated sufficiently by the two heat carriers and the water vapor evaporated from the wet sludge pis discharged from the combined dryer with the fluidized gas. The dried sludge discharged from the ombined dryer with the first heat carrier is sent to a incinerating chamber of a circulating fluidized ed. Thus, the wet sludge with the water content at 60-90% is dried and incinerated in the circulating uidized bed incinerator or the circulating fluidized bed boiler and the drying and incinerating of the wet sludge can be finished in one single equipment. The wet sludge is returned to the incinerator chamber with the circulation ash after it is dried in the combined dryer. A great deal of water contained in the wet sludge does not go into the rear gas flue with the high temperature gas, it comes out with the fluidized gas in the dryer instead, thus the loss of the heat is reduced. The combined dryer is provided with heat discharging tubes that are connected to the tubular heat exchanger in the rear gas flue. The flue gas from the incinerator chamber and the high temperature ashes provide heat energy to dry the wet sludge, thus the waste heat of the incinerator is used sufficiently.

Description

Composite dryer and wet sludge incineration treatment method and device with composite dryer

The present invention relates to a waste treatment device and a treatment method, and more particularly to a wet sludge treatment device and a treatment method. technical background

Sludge is a solid residue after sewage treatment, and the amount of sludge accounts for about 3% of the sewage treatment. ~5%. (in terms of water content of 97%). The amount of industrial and domestic sewage treatment in China is increasing rapidly. With the continuous construction of sewage treatment plants, more sludge will be produced. The composition of the sludge is very complicated. In addition to containing a large amount of water, it also contains common organic matter, refractory organic matter, various trace elements, pathogenic microorganisms, parasite eggs, heavy metals and other components.

The sludge treatment method with incineration as the core process can meet the requirements of reduction, stabilization and harmlessness to the greatest extent. However, most of the existing sludge incineration methods require special equipment to dry the sludge and then incinerate it. The drying and incineration are completed in two sets of equipment, and the system is complicated; the drying equipment consumes a large amount of energy. , high running cost and high safety requirements; and simple incineration of dry sludge, easy to produce NOx, need to be equipped with denitrification device after the incinerator; meanwhile, due to sulfur in the sludge, it is necessary to equip the incinerator with a desulfurization device. . This makes the sludge incineration system complex and harmless.

Adding un-dried wet sludge directly to the incinerator for incineration, the unit processes such as drying, incineration and even harmless treatment of the sludge can be concentrated in a single unit at the same time, simplifying the sludge incineration treatment process , to reduce the cost of treatment; but the moisture contained in the wet sludge will be discharged along with the high-temperature flue gas generated by the incineration, taking away a lot of heat, so a large amount of auxiliary fuel needs to be added to achieve energy balance. Summary of the invention

The object of the present invention is to provide a composite dryer which heats wet sludge by two kinds of heat carriers, and the wet sludge directly exchanges heat with a heat carrier in the composite dryer, and at the same time The heat carrier carries out indirect heat exchange, and the wet sludge is in a fluidized state during the drying process, so that the heat of the two heat carriers can be fully utilized to efficiently and flexibly heat the wet sludge, so that the moisture of the wet sludge is evaporated to achieve drying. The evaporated water is discharged into the dryer as a fluidized gas in the form of water vapor, and the dried sludge is discharged to the composite dryer together with the heat carrier directly transferring heat. Another object of the present invention is to provide a circulating fluidized bed wet sludge drying incineration treatment method using a composite dryer, which combines drying and incineration of sludge, and concentrates on an integrated device, wet The heat required for sludge drying is directly derived from the heat released by the combustion of the sludge and the auxiliary fuel, and the residual heat of the incinerator preferably recovered from the flue gas, and the dried sludge is incinerated in the furnace.

A third object of the present invention is to provide a circulating fluidized bed wet sludge drying incineration treatment device using a composite dryer, which organically combines sludge drying and incineration, and concentrates on an integrated device. The heat required for the drying of the wet sludge is directly derived from the heat released by the combustion of the sludge and the auxiliary fuel, and the residual heat of the incinerator preferably recovered from the flue gas, and the dried sludge is incinerated in the furnace.

The technical solution of the present invention is as follows:

The composite dryer provided by the present invention comprises: a rectangular cavity 600, a wind deflector 620 is horizontally mounted on the lower portion of the inner cavity, and a wind cap 621 is disposed on the air distribution wrench 620; The chamber is a fluidizing plenum 622;

The lower portion of the inner cavity of the cavity 600 is provided with a longitudinal baffle partition wall 606 fixed on the bottom cavity wall of the cavity 600 and the cavity walls on both sides; the baffle partition wall 606 divides the lower part of the cavity into drums in the length direction. a bubble fluidized bed type direct heat exchange chamber 602 and a bubbling fluidized bed type indirect heat exchange chamber 603; the indirect heat exchange chamber 603 is internally provided with a heat release coil 608 filled with a heat exchange medium, and the direct heat exchange chamber The top cover of the 602 is provided with a wet sludge inlet 609, and the lower end wall or the outer side wall is provided with a hot ash inlet 630; the top cover and the outer side wall of the indirect heat exchange chamber 603 are respectively provided with an exhaust port 610 and dry sludge Exit 611.

The fluidizing plenum 622 is divided into two parts, left and right, and corresponds to the direct heat exchange chamber 602 and the indirect heat exchange chamber 603, respectively. The upper end of the baffle partition 606 is slightly higher than the upper end of the heat release coil 608. The hot ash inlet 630 is located at the lower end wall or the outer side wall of the direct heat exchange chamber 602. The shape of the inlet is circular, rectangular or square, and the number is 1~3, and the sum of the diameter or the width is the width of the direct heat exchange chamber 602. The ratio is 0.1 to 1. The wet sludge inlet port 609 is located on the side of the direct heat exchange chamber 602 that is biased toward the hot ash inlet 630. The exhaust port 610 is located on a side of the indirect heat exchange chamber 603 that is biased toward the dry sludge outlet 611. The dry sludge outlet 611 is located in the middle of the outer side wall of the indirect heat exchange chamber 603, and is at the same height as the top of the heat release coil 608, and the ratio of the width to the width of the indirect heat exchange chamber 603 is 0.5 to 1. The heat release coil 608 is arranged along the length direction of the cavity (i.e., the hot ash flow direction), and the heat exchange medium introduced therein is heat transfer oil or steam. The direct heat exchange chamber 602 and the indirect heat exchange chamber 603 have a fluidization velocity of 0.3 to 0.8 m/s.

The invention provides a circulating fluidized bed wet sludge drying incineration treatment method with a composite dryer, which is characterized in that a wet sludge with a water content of 60 to 90% is incinerated in a circulating fluidized bed incinerator. : A composite dryer is arranged in the circulating fluidized bed high-temperature circulating ash circuit, and the temperature circulating ash separated from the cyclone separator of the circulating fluidized bed incinerator is passed through the hot ash distribution valve, and a part is directly returned to the furnace through the returning device, and the other part Entering the composite dryer; the wet sludge dispersed by the dispersing device is sent to the composite dryer, and the heat is directly mixed with the high-temperature circulating ash in the composite dryer, and is arranged in the heat-dissipating coil disposed in the composite dryer. The heat exchange medium is indirectly heat exchanged, heated and dried to become a dried sludge having a water content of 5 to 20%, and then returned to the furnace together with the circulating ash for incineration. The composite dryer is a bubbling fluidized bed type, and a fluidizing gas is introduced into the bottom, and an exothermic coil is disposed therein. The exothermic coil is connected to a tubular heat exchanger at the tail of the incinerator, and a heat exchange medium is introduced into the heat release coil, and the heat exchange medium absorbs heat of the hot flue gas in the tubular heat exchanger, in the heat release tray The tube is heated to heat the wet sludge. The heat exchange medium is heat transfer oil or steam. The temperature change of the heat exchange medium heating and exothermic is controlled in the range of 100 to 260 °C. The high-temperature circulating ash entering the composite dryer is regulated by a hot ash distribution valve, and the exhaust temperature of the composite dryer is controlled at 80 to 150 °C. The adjustment of the exhaust gas temperature of the composite dryer can be enhanced by adding an inert bed material (such as sand) to the circulation loop to increase the total circulating ash amount. After the exhaust of the composite dryer is dedusted and dehumidified, it is sent back to the composite dryer for circulation as a fluidized gas, or sent to the furnace for incineration.

The invention provides a composite dryer in a high-temperature circulating ash circulation loop of a circulating fluidized bed incinerator, and the high-temperature circulating ash separated by the cyclone separator is distributed through a hot ash distribution valve, and a part enters the returning device and directly returns to the furnace, and the other part enters the composite a drier; a wet sludge having a water content of between 60 and 90% is dispersed by a dispersing device and then added from a wet sludge inlet provided on the composite dryer; the composite dryer is a bubbling fluidized bed type, bottom Introducing a fluidizing gas; wherein the heat releasing coil is arranged, the heat exchange medium absorbs the heat of the hot flue gas in the tubular heat exchanger, releases heat in the heat releasing coil, and heats the wet sludge; the heat exchange medium is heat conducting oil or steam. The heat of the flue gas brought in by the heat exchange medium in the heat-dissipating coil is used to heat and dry the wet sludge, but this part of the heat is insufficient to dry the wet sludge to a moisture content of 5 to 20%, so that the high-temperature circulating ash is passed. Make up.

The high-temperature circulating ash entering the composite dryer is regulated by a hot ash distribution valve, and the combined dryer exhaust temperature is controlled at 80 to 150 ° C, and sufficient heat is supplied to dry the wet sludge to a moisture content of 5 to 20%. Hot ash dispensing valves can be mechanical or pneumatically controlled. In addition, by adding inert bed material (such as sand) to the circulation loop to increase the total circulating ash amount, the adjustment range of the hot ash distribution valve is increased, and the adjustment ability of the composite dryer exhaust temperature is enhanced; The mud is directly mixed with the circulating ash in the composite dryer, indirectly exchanges heat with the exothermic coil, is heated, the water content is evaporated, and dried to a dry sludge having a water content of 5 to 20%, which is passed along with the circulating ash. The mechanical conveying method or the pneumatic method is returned to the furnace for incineration.

Most of the moisture content of the wet sludge is evaporated in the composite dryer, and the fluidized gas of the composite dryer is taken out from the top of the composite dryer; the exhaust of the composite dryer is separated by fine powder separator to separate fine powder and dust, and the cooler Condensate After condensed water, it is pressurized by a fan, sent back to the composite dryer as a composite dryer fluidized gas, or sent to the furnace for incineration; the fine powder and dust separated by the fine powder separator are sent by mechanical conveying or pneumatic means. After the furnace is incinerated, the condensed water condensed by the cooler is sent back to the sewage treatment plant for treatment.

The wet sludge incineration treatment device with a composite dryer provided by the invention comprises: a circulating fluidized bed incinerator furnace 1, a high temperature gas-solid separator 2 and a tail flue 3, and a hot ash distribution return valve 4, sewage The mud dispersing device 5, the compound drier 6 and the dryer exhaust gas treatment system 7 composed of the connected fine powder separator 71, the cooler 72, the steam separator 73 and the blower 74 are characterized by:

The hot ash distribution return valve 4 is located below the high temperature gas-solid separator 2, the inlet thereof communicates with the high temperature gas-solid separator material leg 21, and the outlet thereof communicates with the incinerator furnace 1 and the composite dryer 6, respectively. The specific structure is: a vertical splitter plate 402 is disposed directly below the material leg 21 of the high temperature gas-solid separator, and the upper part of the vertical splitter plate 402 is respectively provided with a hot ash distribution return valve at the same horizontal temperature. a feed chamber 403 and a second feed chamber 405, the vertical splitter plate 402 splits the projection of the separator feed leg 21 on the bottom surfaces of the first feed chamber 403 and the second feed chamber 405 into two portions ;

A first discharge chamber 404 and a second discharge chamber 406 are further disposed, and the first discharge chamber 404 and the second discharge chamber 406 are respectively provided with a first overflow port 407 and a second overflow port 408, The first overflow port 407 and the bottom end of the second overflow port 408 are at the same level;

The first feed chamber 403 is in communication with the bottom of the first discharge chamber 404 through a first horizontal hole 409, and the upper portion of the first discharge chamber 404 is connected to the incinerator furnace 1 through a first overflow port 407; The second feed chamber 405 and the bottom of the second discharge chamber 406 are communicated through the second horizontal hole 410; the first horizontal hole 409 and the second horizontal hole 410 are at the same level; the top of the vertical splitter 402 Not lower than the top of the first horizontal hole 409 and not higher than the bottom end of the first overflow port 407; the first discharge chamber 404, the first feed chamber 403, the second feed chamber 405 and the second discharge The bottom surface of the chamber 406 is provided with a hood with a hood, and the lower portion of the air distribution plate is respectively disposed with the first discharge chamber 404, the first feeding chamber 403, the second feeding chamber 405 and the second discharging chamber 406. Corresponding plenums, the plenums are connected to a fluid flow with adjustable flow rate; the first discharge chamber 404 is connected to the second discharge chamber 406 by a balance duct 401;

The composite dryer 6 is connected to the hot ash distribution return valve 4 through a second overflow port 408, and the specific structure thereof is:

A vertical inlet partition wall 605 and a baffle partition wall 606 which are parallel to each other are disposed in the composite dryer 6; the inlet partition wall 605 is located in the composite dryer 6 near the second overflow port of the hot ash distribution return valve 4. At 408, the baffle partition wall 606 is located in the middle of the composite dryer 6, and the two are divided into the inlet chamber 601 and directly exchanged inside the composite dryer 6. a heat chamber 602, an indirect heat exchange chamber 603; an upper portion of the inlet chamber 601 is in communication with the second overflow port 408, and the inlet chamber 601 and the direct heat exchange chamber 602 are separated by an inlet partition 605, and the bottom portions thereof are communicated; The direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are separated by a baffle partition wall 606, and the upper portions thereof are communicated with each other; and the bottom surfaces of the inlet chamber 601, the direct heat exchange chamber 602, and the indirect heat exchange chamber 603 are provided with hoods. The air distribution plate, the air chamber corresponding to the inlet chamber 601, the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are respectively disposed under the air distribution plate, and the air chamber is provided with a fluid gas with adjustable flow rate; The fluidizing gas in the heat exchange chamber 602 and the indirect heat exchange chamber 603 is an inert gas or a cooled incinerator flue gas, and the fluidization speed is 0.4~1.5 m/s _;

a wet sludge inlet 609 is disposed at a top of the direct heat exchange chamber 602 near the inlet chamber 601, and an exhaust port 610 is disposed at a top of the indirect heat exchange chamber 603 away from the inlet chamber 601. The indirect heat exchange chamber 603 is disposed. An exothermic coil 608 is disposed, the upper end of the baffle partition 606 is slightly higher than the upper end of the heat release coil 608 to avoid wear of the heat release coil 608; the heat release coil 608 and the tubular tube in the tail flue 3 The heat exchanger 31 is in communication, and the heat release coil 608 and the tubular heat exchanger 31 are filled with a heat exchange medium; the sludge dispersing device 5 is a mechanical or pneumatic sludge dispersing device, which passes through the wet sludge. The inlet port 609 is in communication with the composite dryer 6;

The side of the composite dryer 6 remote from the second overflow port 408 is provided with a thousand sludge outlet 611 and an exhaust port 610; the dry sludge outlet 611 passes through the dry sludge returner 612 or the first spiral feedstock The machine 613 is in communication with the incinerator furnace 1;

The dryer exhaust treatment system 7 communicates with the composite dryer 6 through the exhaust port 610 of the composite dryer 6; the fine powder outlet of the fine powder separator 71 of the dryer exhaust treatment system 7 passes through the fine powder return The hopper 711 or the second screw feeder 712 is in communication with the incinerator furnace 1 to return the sludge fine powder separated from the dryer exhaust to the incinerator furnace 1.

The dry sludge outlet 611 is disposed on the side wall of the composite dryer 6 away from the second overflow port 408, and the bottom end thereof is equal to the bottom end of the second overflow port 408, and passes through the dry sludge returner 612 and The incinerator furnace 1 is connected to each other, and the dried sludge and the cooled circulating ash are sent back to the incinerator furnace 1 through the dry sludge returner 612.

The dry sludge outlet 611 is disposed at one end of the bottom surface of the composite drying 6 indirect heat exchange chamber 603 away from the inlet chamber 601, and is connected to the incinerator furnace 1 through the first screw feeder 613, and the dried sludge and the dried sludge are The cooled circulating ash is sent back to the incinerator furnace 1 via the first screw feeder 613.

An outlet partition wall 607 parallel to the inlet partition wall 605 is disposed in the indirect heat exchange chamber 603 of the composite dryer 6, and the outlet chamber 604 is partitioned. The bottom surface of the outlet chamber 604 is provided with an air distribution plate with a hood. A plenum corresponding to the outlet chamber 604 is disposed below the wind plate, and a flow-regulated fluidizing gas is introduced into the wind chamber; the indirect heat exchange chamber 603 separated by the outlet partition 607 communicates with the bottom of the outlet chamber 604; The dry sludge outlet 611 is set at The bottom end of the outlet chamber 604 has a bottom end that is equal to the bottom end of the second overflow opening 408 and is in communication with the incinerator furnace 1 .

The ratio of the area of the two portions of the vertical splitter 402 that divides the projection of the separator legs 21 on the bottom surfaces of the first feed chamber 403 and the second feed chamber 405 is 0.25 to 4.0.

The fan 74 outlet of the dryer exhaust treatment system 7 communicates with the direct heat exchange chamber 602 of the composite dryer 6 and the bottom plenum of the indirect heat exchange chamber 603 through the pilot gas line 741.

The fan 74 outlet of the dryer exhaust treatment system 7 is in communication with the incinerator furnace 1 via a branch line 742. The inlet of the fine powder returner 711 is provided with a sanding port 713. The inlet of the second screw feeder 712 is provided with a sanding port 713.

The principle of the invention is:

The composite dryer of the present invention adds the dispersed wet sludge from the top of the direct heat exchange chamber, directly mixes with the heat carrier (hot ash) in the fluidization state in the direct heat exchange chamber during the falling process, is dried and Granulation. The hot ash entering from the bottom and the hot ash in the direct heat exchange chamber are mixed in a fluidized state to provide heat to the direct heat exchange chamber. Then the hot ash and the sludge pass through the partition wall under the action of the fluidizing gas, enter the indirect heat exchange chamber, and indirectly exchange heat with the heat exchange medium in the heat release tube bundle in the indirect heat exchange chamber, continue to granulate and dry, and dry The sludge is discharged from the dry sludge outlet together with the cooled hot ash, and the water evaporated from the wet sludge is discharged from the exhaust port with the fluidizing gas.

The drying process of the wet sludge is carried out in a composite dryer, using the heat generated by the high-temperature circulating ash and the heat generated by the combustion of the auxiliary fuel, and also recovering the residual heat of the flue gas from the flue gas, drying the wet sewage The mud and wet sludge are dried into granular dry sludge with a water content of 5 to 20%, and then returned to the furnace with the circulating ash for incineration. The flue gas generated by the incineration contains only a small amount of water vapor, and the heat of the furnace is discharged. Significantly reduced; most of the moisture in the wet sludge is discharged in the form of water vapor with the lower temperature composite dryer exhaust, the water vapor is condensed into water in the cooler, can be sent back to the sewage treatment plant for treatment, after dedusting and dehumidification The compound dryer exhaust can be recycled in a closed cycle or sent to the furnace for incineration, which can prevent the odorous gas generated during sludge drying from being discharged into the environment.

The high-temperature circulating ash separated in the circulating fluidized bed incinerator cyclone separator is distributed by the hot ash distribution return valve, part of which is directly returned to the furnace, and the other part enters the composite dryer; wet sludge with water content between 60 and 90% After being dispersed by the dispersing device, it is added from the wet sludge inlet port provided on the composite dryer; the composite dryer is a bubbling fluidized bed type, and the bottom is filled with a fluidizing gas, wherein the heat releasing coil is arranged, and the heat exchange medium is The tubular heat exchanger in the tail flue absorbs the heat of the hot flue gas, and then releases heat in the exothermic coil to heat the wet sludge; the heat exchange medium may be heat transfer oil or steam. The heat of the flue gas brought in by the heat exchange medium in the heat release coil is used to heat and dry the wet sludge, but this part of the heat is insufficient to dry the wet sludge to a moisture content of 5 to 20%, and the insufficient portion is distributed by hot ash. The return valve is diverted to the composite dry The high temperature circulation of the dryer is ash-filled.

By adjusting the fluidized wind speed of the first feed chamber, the second feed chamber, and the first discharge chamber and the second discharge chamber of the hot ash distribution return valve, the circulating ash can be directly returned to the furnace and into the composite dryer. Distribute between them to control the amount of enthalpy circulating ash entering the composite dryer, control the exhaust temperature of the composite dryer to 80~150 °C, and provide enough heat to dry the wet sludge to a moisture content of 5~20%. . The adjustment range of the hot ash distribution return valve can be increased by adding an inert bed material (such as sand) to the circulation loop to increase the total circulation ash amount, and the adjustment ability of the composite dryer exhaust temperature can be enhanced; The mud is directly mixed with the circulating ash in the composite dryer, indirectly exchanges heat with the exothermic coil, is heated, the water content is evaporated, and dried to a dry sludge having a water content of 5 to 20%, which is passed along with the circulating ash. The feeder is returned to the furnace for incineration.

When the height of the hot ash direct return port and the dry sludge return port are not equal, the pressure of the first overflow port and the second overflow port are not equal, and the position of the splitter plate can be used to balance the circulating ash directly to the furnace and the inflow. The flow resistance of the composite dryer two ways. When the hot ash direct return port is higher than the dry sludge return port, the first overflow port pressure is lower, and the splitter plate divides the splitter material legs on the first feed chamber and the second feed chamber bottom surface. The ratio of the area of the two parts should be less than 1; otherwise it should be greater than 1.

Most of the moisture content of the wet sludge is evaporated in the composite dryer, and the fluidized gas from the composite dryer is taken out from the top of the composite dryer; the composite dryer is separated by fine powder separator to separate fine powder and dust, and cooled. After condensing the condensed water, it is pressurized by the fan, sent back to the composite dryer as a composite dryer fluidized gas, and partially sent to the furnace for incineration; the fine powder and dust separated by the fine powder separator are mechanically transported or The pneumatic method is sent back to the furnace for incineration, and the condensed water condensed by the cooler is sent back to the sewage treatment plant for treatment.

The drying process of the wet sludge is carried out in a composite dryer, using the sludge from the tempering circulating ash and the heat generated by the combustion of the auxiliary fuel, and also recovering the residual heat of the flue gas from the flue gas, drying and dampening The sludge and wet sludge are dried to 5~20% of granular dry sludge, and then returned to the furnace with the circulating ash for incineration. The high-temperature flue gas generated by incineration contains only a small amount of water vapor; Part of the water is discharged in the form of water vapor with the lower temperature composite dryer exhaust. The water vapor is condensed into water in the cooler and can be sent back to the sewage treatment plant for treatment. The composite dryer exhaust after dedusting and dehumidification can be in a closed loop. It can be recycled in the furnace and can be sent to the furnace for incineration. It can prevent the odorous gas generated during sludge drying from being discharged into the environment.

The composite dryer of the invention can be used for drying the waste water having a moisture content such as sludge, such as urban sewage sludge, paper sludge, sludge of the petrochemical industry, etc., and can also be used for drying the leachate concentrated in landfills. Chemical.

The circulating fluidized bed wet sludge composite dry incineration treatment method and treatment device provided by the invention have the following advantages: Breaking through the mode of re-incineration and re-incineration, the two processes are independently carried out, and the sludge is dried and incinerated organically. Together, it is concentrated in an integrated device, which saves heat loss and power consumption caused by material cooling and transportation, greatly simplifies the drying and incineration process of wet sludge, and simplifies the drying and incineration equipment; The heat required for the drying of the mud comes from the heat released by the combustion of the sludge and the auxiliary fuel and the residual heat of the hot flue gas of the incinerator: the hot particles and the wet sludge are in direct contact with the composite dryer, fully blended, and the heat transfer is enhanced. The wet sludge is quickly heated and dried; at the same time, the wet sludge also exchanges heat with the heat release coil to absorb the heat recovered from the hot flue gas brought by the heat exchange medium, thereby fully utilizing the waste heat of the flue gas of the incinerator .

For the pure combustion of wet sludge, the method and apparatus of the present invention can increase the moisture content of the wet sludge capable of pure combustion by 2 to 3 percentage points, and the wet sludge having a water content of 73 to 75% and below. The auxiliary fuel incineration can be omitted; for the incineration of the high water content wet sludge requiring the addition of the auxiliary fuel, the method and the device of the invention can reduce the auxiliary fuel addition amount and save the running cost; the circulating fluidized bed incinerator adopts the circulation The fluidized combustion mode has the function of suppressing NOx generation and desulfurization; most of the moisture contained in the wet sludge is no longer discharged with the high-temperature flue gas generated by the incineration, but is concentrated in the low-temperature gas discharged from the composite dryer, which is reduced. The heat loss of the system reduces the consumption of auxiliary fuel in the incinerator or increases the upper limit of the moisture content of the wet sludge without the need to add auxiliary fuel for incineration; the gas generated in the sludge drying is recycled or fed after being treated. The furnace is incinerated so that no odorous gas is emitted during the treatment. DRAWINGS

Figure 1 is a front elevational view of a composite dryer in accordance with an embodiment of the present invention;

Figure 2 is a cross-sectional view showing a composite dryer of Embodiment 1 of the present invention;

Figure 3 is a front elevational view of a composite dryer of Embodiment 2 of the present invention;

Figure 4 is a cross-sectional view showing a composite dryer of Embodiment 2 of the present invention;

Figure 5 is a schematic view showing a circulating fluidized bed wet sludge drying incineration treatment method with a composite dryer according to Embodiment 3 of the present invention; - Figure 6 is a circulating fluidized bed wet sewage with a composite dryer according to Embodiment 4 of the present invention; Schematic diagram of a mud drying incineration treatment method;

Figure 7 is a schematic view showing a circulating fluidized bed wet sludge drying incineration treatment apparatus with a composite dryer according to a fifth embodiment of the present invention.

Figure 8 is a schematic view of a hot ash dispensing return valve and a composite dryer of Embodiment 5 of the present invention.

Figure 9 is a schematic view showing a circulating fluidized bed wet sludge drying incineration treatment apparatus with a composite dryer according to a sixth embodiment of the present invention. Figure 10 is a schematic view of a hot ash dispensing return valve and a composite dryer of Embodiment 6 of the present invention.

Figure 11 is a schematic view showing a circulating fluidized bed wet sludge drying incineration treatment apparatus with a composite dryer according to a seventh embodiment of the present invention.

Figure 12 is a schematic view showing a hot ash distribution return valve and a composite dryer of Embodiment 7 of the present invention. detailed description

Example 1

The composite dryer of this embodiment has a structure comprising:

The rectangular cavity 600 has a wind deflecting plate 620 laterally disposed on the lower portion of the inner cavity, and a wind cap 621 on the air distributing plate 620. The chamber below the air distribution plate 620 is a fluidizing air chamber 622; The flow dividing wall 606 divides the cavity into a direct heat exchange chamber 602 and an indirect heat exchange chamber 603 in the longitudinal direction, both chambers are bubbling fluidized beds; the direct heat exchange chamber 602 is provided with a hot ash inlet 630 and wet sludge. The inlet port 609 is disposed inside the indirect heat exchange chamber 603, and an exhaust port 610 and a dry sludge outlet 611 are disposed. The fluidizing plenum 622 is divided into two parts corresponding to the direct heat exchange chamber 602 and the indirect heat exchange chamber 603, respectively. The baffle partition 606 is slightly higher than the heat release coil 608. The hot ash inlet 630 is located at one end of the bottom surface of the direct heat exchange chamber 602 away from the baffle partition 606. The inlet is rectangular in shape and is as wide as the direct heat exchange chamber 602. The wet sludge inlet port 609 is located on the side of the direct heat exchange chamber 602 that is biased toward the hot ash inlet 630 (either between the centerline of the direct heat exchange chamber 602 and the outer sidewall). The exhaust port 610 is located on the side of the indirect heat exchange chamber 603 which is biased toward the dry sludge outlet 611. The dry sludge outlet 611 is located in the middle of the side opposite the indirect heat exchange chamber 603 and the baffle partition 606, and is at the same height as the top of the heat release tube bundle, and the ratio of the width to the width of the indirect heat exchange chamber is 0.5. The heat release coil 608 is arranged along the length direction, and heat transfer oil is introduced therein. The direct heat exchange chamber 602 has a fluidization velocity of 0.5 m/s, and the intermediate heat exchange chamber 603 has a fluidization velocity of 0.4 m/s. The wet sludge is fed from the wet sludge addition port 609, and the dry sludge is discharged from the dry sludge outlet 611 with the cooled circulating ash. Example 2

The composite dryer of this embodiment has a structure comprising:

The rectangular body cavity 600 has a wind deflecting plate 620 laterally disposed on the lower portion of the inner cavity, and a wind cap 621 disposed on the air distributing plate 620; the chamber below the air distribution plate 620 is a fluidizing air chamber 622; The flow dividing wall 606 divides the cavity into a direct heat exchange chamber 602 and an indirect heat exchange chamber 603 in the longitudinal direction, both chambers are bubbling fluidized beds; the direct heat exchange chamber 602 is provided with a hot ash inlet 630 and wet sludge. The inlet 609 is disposed inside the indirect heat exchange chamber 603, and an exhaust port 610 and a dry sludge outlet 611 are disposed. The fluidizing plenum 622 is divided into two parts, respectively, and the direct heat exchange chamber 602 It corresponds to the indirect heat exchange chamber 603. The baffle partition 606 is slightly taller than the heat release coil 608. The hot ash inlet 630 is located at the bottom of the side of the direct heat exchange chamber 602. The inlet shape is circular, the number is two, and the ratio of the sum of the diameters to the width of the direct heat exchange chamber 602 is 0.4. The wet sludge addition port 609 is located on the side of the direct heat exchange chamber 602 that is biased toward the hot ash inlet 630. The exhaust port 610 is located on the side of the indirect heat exchange chamber 603 that is biased toward the dry sludge outlet 611. The dry sludge outlet 611 is located at the middle of the side opposite to the indirect heat exchange chamber 603 and the baffle partition wall 606, and is at the same height as the top of the heat release tube bundle, and the ratio of the width to the width of the indirect heat exchange chamber is 1. The heat release coils 608 are arranged in the longitudinal direction, and steam is introduced therein. The direct heat exchange chamber 602 has a fluidization velocity of 0.3 m/s, and the indirect heat exchange chamber 603 has a fluidization velocity of 0.8 m/s. The landfill leachate is added from the wet sludge inlet 609, and the dried leachate residue is discharged from the dry sludge outlet 611 with the cooled circulating ash. Example 3

The wet sludge A having a moisture content of 60% is separately dried in a circulating fluidized bed incinerator, and the wet sludge A is added from the wet sludge addition port 609 provided in the composite dryer 6, and is added at the time of addition. The sludge dispersing device 5 on the wet sludge adding port 609 is broken up; the compound drier 6 is disposed in the circulating ash circulating circuit of the circulating fluidized bed incinerator, and the high temperature circulating ash separated by the cyclone 2 is mechanically heated. The ash distribution valve 41, a part of which enters the returning device 42 directly returns to the furnace 1 and another part enters the composite dryer 6; the composite dryer 6 is of a bubbling fluidized bed type, and a fluidizing gas is introduced into the bottom, in which a heat releasing coil 608 is disposed. The heat release coil 608 is connected to the tubular heat exchanger 31 in the flue tail 3 of the incinerator, and the heat exchange medium G (steam) absorbs the heat generated by the combustion of the flue gas in the tubular heat exchanger 31, After heating to 150 Torr, heat is released in the heat release coil 608, the wet sludge is heated, and the steam is cooled to 100 ° C; sand is added from the lower portion of the furnace 1 to increase the total circulation amount, and is adjusted into the composite drying through the hot ash distribution valve 41. The high temperature circulating ash of the device 6, The temperature of the composite dryer exhaust C is controlled to about 80 ;; the wet sludge A is directly mixed with the circulating ash in the composite dryer 6, and is heated, the moisture is evaporated, and the wet sludge A is dried to a moisture content of 20 % of the dried sludge B is returned to the furnace 1 by pneumatic means together with the circulating ash; the composite dryer exhaust C is taken out from the top thereof, the dust D is separated by the fine powder separator 71, and the cooler 72 condenses the condensed water E After that, it is pressurized by the fan 74, and is returned to the composite dryer 6 as a composite dryer fluidized gas for recycling; the dust D separated by the fine powder separator 71 is sent back to the furnace for incineration, and the condensed water E condensed by the cooler 72 is sent. Return to the sewage treatment plant for treatment. Example 4

Adding coal as a supplementary fuel in a circulating fluidized bed incinerator to incinerate wet sludge A having a water content of 90%, and adding wet sludge A from the wet sludge addition port 609 provided in the composite dryer 6, and adding When installed in wet sludge plus The sludge dispersing device 5 on the inlet 609 is broken up; the composite drier 6 is disposed in the circulating fluidized bed incinerator circulating ash circulating circuit, and the high temperature circulating ash separated by the cyclone 2 is pneumatically controlled by the hot ash distributing valve 41 a part of the returning feeder 42 is directly returned to the furnace 1 and the other part is entered into the composite dryer 6; the composite dryer 6 is a bubbling fluidized bed type, and a fluidizing gas is introduced into the bottom, in which a heat releasing coil 608 is disposed; The coil 608 is connected to the tubular heat exchanger 31 in the flue tail 3 of the incinerator, and the heat exchange medium G (heat transfer oil) absorbs heat generated by the combustion of the flue gas in the tubular heat exchanger 31, and is heated to At 260 ° C, heat is released in the heat release coil 608 to heat the wet sludge, and the heat conducting sleeve is cooled to 220 ° C _; the high temperature circulating ash entering the composite dryer 6 is adjusted by the hot ash distribution valve 41 to dry the composite. The temperature of the exhaust gas C is controlled at about 150 ° C; the wet sludge A is directly mixed with the circulating ash in the composite dryer 6 and heated, the water content is evaporated, and the wet sludge A is dried to a moisture content of 15%. Dry sludge B, returned by mechanical transport together with circulating ash膛1 incineration; the composite dryer exhaust c is taken from the top thereof, the dust D is separated by the fine powder separator 71, and the condensed water E is condensed by the cooler 72, and then pressurized by the blower 74, and sent to the furnace 1 for incineration; The dust D separated by the fine powder separator 71 is sent back to the furnace 1 for incineration, and the condensed water E condensed by the cooler 72 is sent back to the sewage treatment plant for treatment. Example 5

7 and 8 are schematic views of the structure of the present embodiment. It can be seen from the figure that the wet sludge incineration treatment apparatus with the composite dryer of the embodiment is composed of a circulating fluidized bed incinerator furnace 1 and a high temperature gas-solid separator 2 , the tail flue 3, the hot ash distribution return valve 4, the sludge dispersing device 5, the compound drier 6, the dryer exhaust treatment system 7 (including the fine powder separator 71, the cooler 72, the steam separator 73 and Fan 74, etc.).

The hot ash distribution return valve 4 is located below the separator 2, and the inlet is connected to the separator leg 21, and the outlet is connected to the incinerator furnace 1 and the composite dryer 6, respectively, and the specific structure is:

A vertical splitter plate 402 is disposed directly below the separator leg 21, and a hot ash distribution return valve first feed chamber 403 and a second feed chamber 405 are respectively disposed on both sides thereof. The upper portions of the two chambers communicate with each other, and the bottom surface is in the same The horizontal height, the vertical diverter plate 402 divides the projection of the separator material leg 21 on the bottom surface of the two chambers into two parts; further comprising a first discharge chamber 404 and a second discharge chamber 406, the first discharge chamber 404 And the upper portion of the second discharge chamber 406 is respectively provided with a first overflow port 407 and a second overflow port 408;

The first feed chamber 403 communicates with the bottom of the first discharge chamber 404 through the first horizontal hole 409, and the upper portion of the first discharge chamber 404 communicates with the incinerator furnace through the first overflow port 407; the second feed chamber 405 The second discharge port 406 is communicated with the bottom of the second discharge chamber 406 through the second horizontal hole 410, and the second discharge chamber 406 is provided with a second overflow port 408. The first overflow port 407 and the second overflow port 408 are at the same level. Height; the first horizontal hole 409 and the second horizontal hole 410 are at the top end The same level; the first discharge chamber 404, the first feed chamber 403, the second feed chamber 405 and the second discharge chamber 406 are provided with a hood with a hood, and the underside of the air distribution plate is respectively provided The first discharge chamber 404, the first feed chamber 403, the second feed chamber 405 and the second discharge chamber 406 correspond to a plenum, and the air chamber is provided with a flow-regulated fluidizing wind. A balance duct 401 is connected between the first discharge chamber 404 and the second discharge chamber 406.

The top of the vertical diverter plate 402 is equal to the bottom end of the first overflow port 407; the vertical diverter plate 402 will separate the legs of the separator

The ratio of the areas of the two portions divided by the projections on the bottom surfaces of the first feed chamber 403 and the second feed chamber 405 is 0, 25.

The second overflow port 408 of the hot ash distribution return valve 4 is in communication with the composite dryer 6, and the specific structure of the composite dryer 6 is:

The composite dryer 6 has a vertical inlet partition 605 and a baffle partition 606, which are parallel; the entrance partition

605 is located in the composite dryer 6 near the second overflow 408 of the hot ash distribution return valve 4, and the baffle partition 606 is located in the middle of the composite dryer 6, which divides the interior of the composite dryer 6 into an inlet chamber 601, The direct heat exchange chamber 602, the indirect heat exchange chamber 603; the second overflow port 408 is in communication with the upper portion of the inlet chamber 601, and the inlet chamber 601 and the direct heat exchange chamber 602 are separated by the inlet partition wall 605, and the bottom portions thereof communicate; the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are separated by a baffle partition wall 606, and the upper portions thereof are communicated; the bottom surface of the inlet chamber 601, the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are provided with a hood with a hood, below the air distribution plate A plenum corresponding to the inlet chamber 601, the direct heat exchange chamber 602, and the indirect heat exchange chamber 603 is disposed, and a fluidizing gas whose flow rate can be adjusted is introduced into the wind chamber. The fluidizing gas of the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 is an inert gas, and the fluidization speed is 0.4 m/s. The top of the direct heat exchange chamber 602 is adjacent to the inlet chamber 601 with a wet sludge inlet 609, and the top of the indirect heat exchange chamber 603 is provided with an exhaust port 610 away from the inlet chamber 601. The indirect heat exchange chamber 603 is internally provided with a heat release coil 608, and the upper end of the baffle partition wall 606 is slightly higher than the upper end of the heat release coil 608. The exothermic coil 608 is in communication with the tubular heat exchanger 31 in the tail flue 3, and the exothermic coil 608 and the tubular heat exchanger 31 are filled with a heat exchange medium.

Composite dryer 6 Wet sludge inlet port There is a mechanical sludge dispersing device above 609. The dispersed sludge falls directly into the composite dryer.

The side wall of the composite dryer 6 away from the second overflow port 408 is provided with a dry sludge outlet 611, the bottom end of the dry sludge outlet 611 is equal to the bottom end of the second overflow port 408; the dry sludge outlet 611 is dried. The mud returner 612 is connected to the incinerator furnace 1 and the dried sludge and the cooled circulating ash are sent back to the incinerator furnace 1 via the dry sludge returner 612.

The exhaust port 610 of the composite dryer is connected to the dryer exhaust treatment system 7, and the outlet of the fan 74 of the dryer exhaust treatment system 7 passes through the fluidized gas line 741 and the composite dryer 6 directly exchanges the chamber 602 and indirectly Hot room The bottom plenum of the 603 is connected, and the branch line 742 is connected to the furnace 1 of the incinerator.

The fine powder outlet of the fine powder separator 71 is connected to the incinerator furnace 1 through the fine powder returner 711, and the fine sludge separated from the dryer exhaust gas is sent back to the incinerator furnace 1; the fine powder returner 711 The inlet is provided with a Gaza port 713 for adding sand during operation to improve the transport properties and fluidization characteristics of the sludge fines. Example 6

9 and FIG. 10 are schematic structural views of the present embodiment. It can be seen from the figure that the wet sludge incineration treatment apparatus with the composite dryer of the embodiment is composed of a circulating fluidized bed incinerator furnace 1 and a high temperature gas-solid separator 2 , tail flue 3, hot ash distribution return valve 4, sludge dispersing device 5, composite dryer 6, dryer exhaust treatment system 7 (including fine powder separator 71, cooler 72, steam separator 73 and Fan 74, etc.).

A vertical splitter plate 402 is disposed directly below the separator leg 21, and a hot ash distribution return valve first feed chamber 403 and a second feed chamber 405 are respectively disposed on both sides thereof, and the upper portions of the two chambers communicate with each other, and the bottom surface is at the same level. The height, vertical splitter 402 divides the projection of the separator legs 21 on the bottom surfaces of the two chambers into two portions; further comprising a first discharge chamber 404 and a second discharge chamber 406, the first discharge chamber 404 and The upper portion of the second discharge chamber 406 is respectively provided with a first overflow port 407 and a second overflow port 408;

The first feeding chamber 403 communicates with the bottom of the first discharging chamber 404 through the first horizontal hole 409, the upper portion of the first discharging chamber 404 communicates with the incinerator furnace through the first overflow opening 407; the second feeding chamber 405 The bottom of the second discharge chamber 406 is communicated with the second horizontal hole 410, and the second discharge chamber 406 is provided with a second overflow port 408. The first overflow port 407 and the second overflow port 408 are at the same level. The first horizontal hole 409 and the second horizontal hole 410 are at the same level; the first discharging chamber 404, the first feeding chamber 403, the second feeding chamber 405 and the second discharging chamber 406 are disposed on the bottom surface. a hood with a hood, and a plenum corresponding to the first discharge chamber 404, the first feed chamber 403, the second feed chamber 405, and the second discharge chamber 406 respectively disposed under the air distribution panel, the wind The indoor flow rate is adjustable to the fluidized wind. A balance duct 401 is connected between the first discharge chamber 404 and the second discharge chamber 406. The top end of the flow dividing plate 402 is not lower than the top end of the first horizontal hole 409 and not higher than the bottom end of the first overflow opening 407; the splitter plate 402 has the separator material leg 21 in the first feeding chamber 403 and the second feeding chamber 405 The projected area on the bottom surface is equally divided.

The composite dryer 6 is provided with a vertical inlet partition 605 and a baffle partition 606, which are parallel; the entrance partition wall 605 is located in the composite dryer 6 near the second overflow 408 of the hot ash dispensing return valve 4, and the 'baffle partition 606 is located in the middle of the composite dryer 6, which divides the interior of the composite dryer 6 into an inlet chamber 601. The direct heat exchange chamber 602 and the indirect heat exchange chamber 603; the second overflow port 408 is in communication with the upper portion of the inlet chamber 601, and the inlet chamber 601 and the direct heat exchange chamber 602 are separated by the inlet partition wall 605, and the bottom portions thereof are connected; The chamber 602 and the indirect heat exchange chamber 603 are separated by a baffle partition wall 606, and the upper portion thereof communicates with each other; the bottom surface of the inlet chamber 601, the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are provided with a hood with a hood, and an air distribution plate A plenum corresponding to the inlet chamber 601, the direct heat exchange chamber 602, and the indirect heat exchange chamber 603 is disposed below, and a fluidizing gas whose flow rate can be adjusted is introduced into the air chamber. The fluidizing gas of the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 is an inert gas, and the fluidization speed is 0.8 m/s. A wet sludge inlet 609 is disposed at the top of the direct heat exchange chamber 602 near the inlet chamber 601, and an exhaust port 610 is disposed at the top of the indirect heat exchange chamber 603 away from the inlet chamber 601. The heat release coil 608 is disposed inside the indirect heat exchange chamber 603, and the upper end of the baffle partition wall 606 is slightly higher than the upper end of the heat release coil 608. The heat release coil 608 is in communication with the tubular heat exchanger 31 in the tail flue 3, and the heat release coil 608 and the tubular heat exchanger 31 are filled with a heat exchange medium.

Composite dryer 6 Wet sludge inlet port 609 is provided with a pneumatic sludge dispersing device 5, and the dispersed sludge falls directly into the composite dryer 6.

The composite dryer 6 is provided with a dry sludge outlet 611 at the bottom of the indirect heat exchange chamber 603 away from the inlet chamber 601, and is connected to the incinerator furnace 1 through the first screw feeder 613, and the milled sludge and the cooled The circulating ash is sent back to the incinerator furnace 1 via the first screw feeder 613.

The exhaust port 610 of the composite dryer is connected to the dryer exhaust treatment system 7, and the outlet of the fan 74 of the dryer exhaust treatment system 7 passes through the fluidization gas line 741 and the composite dryer 6 directly to the heat exchange chamber 602 and indirect heat exchange. The bottom chamber of chamber 603 is connected.

The fine powder outlet of the fine powder separator 71 is connected to the incinerator furnace 1 through the fine powder returner 711, and the sludge fine powder separated from the dryer exhaust gas is returned to the incinerator furnace. Example 7

Figure 11 and Figure 12 are schematic views of the structure of the present embodiment. It can be seen from the figure that the wet sludge incineration treatment device with a composite dryer provided by the present invention is separated from the circulating fluidized bed incinerator furnace by high temperature gas-solids. 2, tail flue 3, hot ash distribution return valve 4, sludge dispersing device 5, composite dryer 6, dryer exhaust treatment system 7 (including fine powder separator 71, cooler 72, steam separator 73 and fan 74, etc.).

The hot ash distribution return valve 4 is located below the separator 2, the inlet is connected to the separator material leg 21, and the outlet is connected to the incinerator furnace 1 and the composite dryer 6, respectively, and the specific structure is: A vertical splitter plate 402 is disposed directly below the separator leg 21, and the two sides of the hot ash distribution return valve are respectively a first feed chamber 403 and a second feed chamber 405. The upper portions of the two chambers communicate with each other, and the bottom surface is at the same level. The height, vertical splitter 402 divides the projection of the separator legs 21 on the bottom surfaces of the two chambers into two portions; further comprising a first discharge chamber 404 and a second discharge chamber 406, the first discharge chamber 404 and The upper portion of the second discharge chamber 406 is respectively provided with a first overflow port 407 and a second overflow port 408;

The first feed chamber 403 communicates with the bottom of the first discharge chamber 404 through the first horizontal hole 409, the upper portion of the first discharge chamber 404 communicates with the incinerator furnace through the first overflow port 407; the second feed chamber 405 and the The bottom of the second discharge chamber 406 is communicated through the second horizontal hole 410, and the second discharge chamber 406 is provided with a second overflow opening 408; the first overflow opening 407 and the bottom end of the second overflow opening 408 are at the same level; The first horizontal hole 409 and the second horizontal hole 410 are at the same level; the first discharge chamber 404, the first feed chamber 403, the second feed chamber 405 and the second discharge chamber 406 are provided with a hood An air distribution plate is disposed below the air distribution plate, and the air chamber corresponding to the first discharge chamber 404, the first feed chamber 403, the second feed chamber 405, and the second discharge chamber 406 are respectively disposed in the air chamber. Flow-regulated fluidized wind. A balance duct 401 is connected between the first discharge chamber 404 and the second discharge chamber 406. The top end of the splitter plate 402 is not lower than the top end of the first horizontal hole 409 and not higher than the bottom end of the first overflow port 407; the splitter plate 402 has the separator material leg 21 in the first feed chamber 403 and the second feed chamber 405 The projected area on the bottom surface is equally divided.

The composite dryer 6 is provided with a vertical inlet partition 605 and a baffle partition 606 which are parallel; the inlet partition 605 is located in the composite dryer 6 adjacent to the second overflow 408 of the hot ash dispensing return valve 4. Wherein, the baffle partition wall 606 is located in the middle of the composite dryer 6, and the inside of the composite dryer 6 is divided into an inlet chamber 601, a direct heat exchange chamber 602, an indirect heat exchange chamber 603; a second overflow port 408 and an inlet chamber 601. The upper chamber is connected, the inlet chamber 601 and the direct heat exchange chamber 602 are separated by an inlet partition 605, and the bottom portions thereof communicate with each other; the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are separated by a baffle partition 606, and the upper portions thereof are communicated; 601. The bottom surface of the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are provided with a hood with a hood, and the lower portion of the air distribution plate is respectively disposed corresponding to the inlet chamber 601, the direct heat exchange chamber 602, and the indirect heat exchange chamber 603. In the wind chamber, the fluid chamber is regulated by a flow of gas that can be adjusted. The fluidizing gas of the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 is a cooled incinerator flue gas having a fluidization speed of 1.5 m/s. A wet sludge inlet 609 is disposed at the top of the direct heat exchange chamber 602 near the inlet chamber 601, and an exhaust port 610 is disposed at the top of the indirect heat exchange chamber 603 away from the inlet chamber 601. The heat release coil 608 is disposed inside the indirect heat exchange chamber 603, and the upper end of the baffle partition wall 606 is slightly higher than the upper end of the heat release coil 608. The heat release coil 608 is in communication with the tubular heat exchanger 31 in the tail flue 3, and the heat release coil 608 and the tubular heat exchanger 31 are filled with a heat exchange medium. A mechanical sludge dispersing device 5 is disposed above the wet sludge inlet port 609 of the composite dryer 6, and the dispersed sludge directly falls into the composite dryer 6.

The other side of the composite dryer 6 opposite to the inlet chamber 601 is provided with an outlet partition wall 607 parallel to the inlet partition wall 605, which separates the outlet chamber 604, the bottom surface of which is a hood with a hood, and the lower part corresponds to the wind chamber. The fluidizing gas with adjustable flow rate is introduced; the indirect heat exchange chamber 603 and the outlet chamber 604 are separated by an outlet partition 607, and the bottom portions thereof communicate; the side of the outlet chamber 604 is provided with a dry sludge outlet 611 and a dry sludge outlet 611 bottom. The end is equidistant with the bottom end of the second overflow port 408; the dry sludge outlet 611 is connected to the incinerator hearth 1.

The exhaust port 610 of the composite dryer is connected to the dryer exhaust treatment system 7, and the outlet of the fan 74 of the dryer exhaust treatment system 7 passes through the fluidization gas line 741 and the composite dryer 6 directly to the heat exchange chamber 602 and indirect heat exchange. The bottom chamber of the chamber 603 is connected, and a branch line 742 is connected to the incinerator furnace 1.

The fine powder outlet of the fine powder separator 71 is connected to the incinerator furnace 1 through the second screw feeder 712, and the sludge fine powder separated from the dryer exhaust gas is sent back to the incinerator furnace 1; The inlet of the material machine 712 is provided with a sanding port 713 for adding sand during operation to improve the transport characteristics and fluidization characteristics of the sludge fine powder.

Claims

Rights request

A composite dryer characterized in that it comprises:

Cavity (600);

The lower portion of the inner cavity of the cavity (600) is provided with a longitudinal baffle partition wall (606) fixed on the bottom cavity wall of the cavity (600) and the cavity walls on both sides; the longitudinal baffle partition wall (606) will cavity The lower part of the body is divided into a bubbling fluidized bed type direct heat exchange chamber (602) and a bubbling fluidized bed type indirect heat exchange chamber (603); the indirect heat exchange chamber (603) is internally arranged with a heat exchange medium Hot coil (608); direct heat exchange chamber (602> side with wet sludge inlet (609> and hot ash inlet (630); indirect heat exchange chamber (603) with dry sludge outlet (611) And exhaust port (610).

2. A composite dryer according to claim 1 wherein said cavity (600) is cuboid and said longitudinal baffle partition (606) has a lower portion of said cavity in said cavity (600) The length direction is partitioned into the direct heat exchange chamber (602) and the indirect heat exchange chamber (603).

3. A composite dryer according to claim 1 wherein said baffle partition (606) has an upper end that is slightly above the upper end of the heat release coil (608).

4. A composite dryer according to claim 1 wherein said hot ash inlet (630) is located at the bottom of the bottom or outer side wall of the direct heat exchange chamber (602).

The composite dryer according to claim 2, wherein the number of hot ash inlets (630) is 1 to 3, and the ratio of the sum of the diameters or widths to the width of the direct heat exchange chamber (602) It is 0.1~1.

The composite dryer according to claim 1, wherein said wet sludge inlet (609) is located in a direct heat exchange chamber (602), and a top cover is away from said indirect heat exchange chamber (603). side.

The compound dryer according to claim 1, wherein said exhaust port (610) is located on a side of the indirect heat exchange chamber (603) from which the top cover is away from said direct heat exchange chamber (602).

A compound dryer according to claim 1, wherein said dry sludge outlet (611) is located on an outer side wall or a bottom wall of the indirect heat exchange chamber (603).

The composite dryer according to claim 2, wherein said dry sludge outlet (611) is located in the middle of the outer side wall of the indirect heat exchange chamber (603), and is the same as the top of the heat release coil (608). High, the ratio of the width to the width of the indirect heat exchange chamber (603) is 0.5 to 1.

10. The composite dryer according to claim 1, wherein said heat releasing coil (608) is arranged along a longitudinal direction of the cavity, that is, a flow direction of hot ash, and a heat exchange medium is introduced therein. For heat transfer oil or steam. The composite dryer according to claim 1, wherein said direct heat exchange chamber (602) and indirect heat exchange chamber (603) have a fluidization velocity of 0.3 to 0.8 m/s or 0.4 to 1.5 m. /s.

12. The composite dryer of claim 1 wherein said direct heat exchange chamber (602) is provided with an inlet partition (605) spaced from the outer sidewall, at the inlet partition (605) and outside. An inlet chamber (601) is formed between the walls, an inlet chamber (601) is in communication with the bottom of the direct heat exchange chamber (602), and a hot ash inlet (630) is disposed at the inlet chamber (601).

13. The composite dryer according to claim 1, wherein said indirect heat exchange chamber (603) is provided with an outlet partition wall (607) spaced apart from the outer side wall, at the outlet partition wall (607) and outside. An exit chamber is formed between the walls

(604), the outlet chamber communicates with the indirect heat exchange chamber (603) at the bottom, and the dry sludge outlet (611) is disposed at the outlet chamber (604).

14. A circulating fluidized bed wet sludge drying incineration treatment method, wherein the incineration wet sludge is dried in a circulating fluidized bed incinerator or a circulating fluidized bed boiler, and is arranged in a circulating fluidized bed high temperature circulation ash circuit. A composite dryer of a bubbling fluidized bed type direct heat exchange chamber and a bubbling fluidized bed type indirect heat exchange chamber, a high temperature circulating ash separated from a cyclone separator of a circulating fluidized bed incinerator, and a hot ash distribution valve Distribution, part of which is returned to the furnace, and another part enters the composite dryer; wet sludge is sent to the composite dryer, directly mixed with the high-temperature circulating ash in the composite dryer, and exchanged in the heat-dissipating coil arranged in the composite dryer The indirect heat exchange of the heat medium is heated and dried, and then returned to the furnace together with the circulating ash for incineration.

15. The circulating fluidized bed wet sludge drying incineration treatment method according to claim 14, wherein the wet sludge has a moisture content of between 60 and 90%, and the wet sludge is dried in a composite dryer. After the dried sludge having a water content of 5 to 20%, it is returned to the furnace together with the circulating ash for incineration.

The circulating fluidized bed wet sludge drying incineration treatment method according to claim 14, wherein the heat release coil is connected to a tubular heat exchanger in the flue of the incinerator tail, and the heat release tray The tube and the tube heat exchanger are filled with a heat exchange medium, and the heat exchange medium absorbs the heat of the flue gas in the tube heat exchanger, releases heat in the heat release coil, and heats the wet sludge.

The circulating fluidized bed wet sludge drying incineration treatment method according to claim 14 or 16, wherein the temperature change of the heat exchange medium heating and exothermic is controlled within a range of 100 to 260 ° C .

18. The circulating fluidized bed wet sludge drying incineration treatment method according to claim 14, wherein the high temperature circulating ash amount entering the composite dryer is adjusted by a hot ash distribution valve, and the composite dryer exhaust temperature is controlled. At 80~150 °C.

19. The circulating fluidized bed wet sludge thousand incineration treatment method according to claim 14, wherein After the dust of the composite dryer is dedusted and dehumidified, it is sent back to the composite dryer for circulation as a fluidized gas, or sent to the furnace for incineration.

20. A wet sludge incineration treatment apparatus comprising:

a circulating fluidized bed incinerator furnace (1) and a high temperature gas-solid separator (2) connected to the upper portion thereof;

The composite dryer (6) according to claim 1;

The hot ash distribution return valve (4), the hot ash distribution return valve (4) is located below the high temperature gas-solid separator (2), and the inlet thereof communicates with the high temperature gas-solid separator material leg (21), and the outlet thereof Connected to the hot ash inlet (630) of the composite dryer (6);

The dry sludge outlet (611) of the composite dryer (6) is in communication with the incinerator furnace (1). A wet sludge incineration treatment apparatus according to claim 20, wherein said hot ash distribution return valve (4) further comprises an outlet communicating with the incinerator furnace (1).

A wet sludge incineration treatment apparatus according to claim 20, wherein said wet sludge incineration treatment apparatus further comprises a tail flue having an upper portion communicating with an upper portion of said high temperature gas-solid separator (2) (3) The exothermic coil (608) of the composite dryer (6) is in communication with the tubular heat exchanger (31) in the tail flue (3).

A wet sludge incineration treatment apparatus according to claim 20, wherein said wet sludge incineration treatment apparatus further comprises a dryer exhaust treatment system (7), said discharge of said composite dryer (6) A port (610) is coupled to the dryer exhaust treatment system (7).

24. The wet sludge incineration treatment apparatus according to claim 23, wherein said dryer exhaust treatment system (7) comprises: a fine powder separator (71), a cooler (72), a steam separator (73) and a fan (74), wherein the fine powder outlet of the fine powder separator (71) passes through a fine powder returner (711) or a second screw feeder (712) and an incinerator furnace ( 1) Connected, the sludge fine powder separated from the dryer exhaust is sent back to the incinerator furnace (1).

The wet sludge incineration treatment apparatus according to claim 20, wherein the wet sludge incineration treatment device further comprises a sludge dispersing device (5), and the sludge dispersing device (5) passes through the wet The sludge addition port (609) is in communication with the composite dryer (6).

A wet sludge incineration treatment apparatus according to claim 21, wherein in said hot ash distribution return valve (4), vertical is disposed directly below the high temperature gas-solid separator material leg (21) a splitter plate (402), on each side of the vertical splitter plate (402), respectively, a first feed chamber (403) and a second feed chamber (405) communicating with each other; and a hot ash distribution return valve (4) A first discharge chamber (404) and a second discharge chamber (406) are disposed, and the first discharge chamber (404) and the second discharge chamber (406) are respectively provided with a first overflow opening (407) ) and the second overflow (408); the first feed chamber (403) communicates with the bottom of the first discharge chamber (404) through the first horizontal hole (409); the second feed chamber (405) and the second discharge chamber (406) The bottom communicates through the second horizontal hole (410).

The wet sludge incineration treatment apparatus according to claim 26, wherein in said hot ash distribution return valve (4), an upper portion of said first discharge chamber (404) passes through said first overflow Mouth (407) with incinerator furnace

(1) In communication, the second overflow port (408) is in communication with the hot ash inlet (630) of the composite dryer (6).

28. The wet sludge incineration treatment apparatus according to claim 26, wherein in said hot ash distribution return valve (4), a first feed chamber (403) and a second feed chamber (405) ) The bottom surface is at the same level.

The wet sludge incineration treatment apparatus according to claim 26, wherein in said hot ash distribution return valve (4), said first overflow port (407) and said second overflow port (408) The bottom 3⁄4 is at the same level.

The wet sludge incineration treatment apparatus according to claim 26, wherein in said hot ash distribution return valve (4), said first horizontal hole (409) and said second horizontal hole (410) The top is at the same level.

The wet sludge incineration treatment apparatus according to claim 26, wherein in the hot ash distribution return valve (4), the top end of the vertical splitter (402) is not lower than the first level The top of the hole (409) is not at the bottom of the first overflow port (407).

The wet sludge incineration treatment apparatus according to claim 26, wherein in said hot ash distribution return valve (4), said first discharge chamber (404), said first feed chamber (403), the second feeding chamber (405) and the second discharging chamber (406) are respectively provided with a hood with a hood, and the lower portion of the air distribution plate is respectively disposed with the first discharging chamber (404) The first feed chamber (403), the second feed chamber (405) and the second discharge chamber (406) correspond to a plenum, and the flow chamber is provided with a flow-regulated fluidized wind.

33. The wet sludge incineration treatment apparatus according to claim 26, wherein in said hot ash distribution return valve (4), said first discharge chamber (404) and said second discharge chamber There is a balance duct (401) connected between (406).

34. The wet sludge incineration treatment apparatus according to claim 26, wherein in said hot ash distribution return valve (4), said vertical splitter (402) separates the material legs (21) The projection on the bottom surfaces of the first feed chamber (403) and the second feed chamber (405) is divided into two portions, the ratio of the area of the two portions being 0.25 to 4.0.

35. The wet sludge incineration treatment apparatus according to claim 26, wherein said composite dryer (6) is provided with a vertical inlet partition wall parallel to the baffle partition (606) ( 605), located near the hot ash distribution At the second overflow port (408) of the return valve (4), the interior of the composite dryer (6) is separated from the inlet chamber (601); the inlet chamber (601) is separated from the direct heat exchange chamber (602) through the inlet The wall (605) is separated, and the bottom of the two are connected; the bottom of the inlet chamber (601) is provided with a hood with a hood, and a wind chamber corresponding to the inlet chamber (601) is disposed below the air distribution plate, and the flow rate in the air chamber is adjustable. Fluidizing gas.

36. The wet sludge incineration treatment apparatus according to claim 26, wherein said dry sludge outlet

(611) is disposed on the side wall of the composite dryer (6) away from the hot ash inlet (630), the bottom end of which is equal to the bottom end of the second overflow port (408), and passes through the dry sludge returner (612) Connected to the incinerator furnace (1), the dried sludge and the cooled circulating ash are sent back to the incinerator furnace (1) via the dry sludge returner (612).

37. The wet sludge incineration treatment apparatus according to claim 20, wherein the dry sludge outlet (611) is disposed on a bottom surface of the composite dryer (6) indirect heat exchange chamber (603) away from the hot ash inlet ( One end of 630) is connected to the incinerator furnace (1) through the first screw feeder (613), and the dried sludge and the cooled circulating ash are passed through the first screw feeder (613). Return to the incinerator furnace (1).

38. The wet sludge incineration treatment apparatus according to claim 26, wherein an outlet parallel to the baffle partition (606) is disposed in the indirect heat exchange chamber (603) of the composite dryer (6) a partition wall (607) partitioning the outlet chamber (604), the bottom surface of the outlet chamber (604) is provided with a hood with a hood, and a plenum corresponding to the outlet chamber (604) is disposed below the air distribution panel a flow-adjustable fluidizing gas is introduced into the wind chamber; the outlet chamber (604) separated by the outlet partition wall (607) communicates with the bottom of the indirect heat exchange chamber (603); and the dry sludge outlet (611) is set On the side wall of the outlet chamber (604), the bottom end of the dry sludge outlet (611) is equidistant from the bottom end of the second overflow port (408) and is in communication with the incinerator furnace (1).

39. The wet sludge incineration treatment apparatus according to claim 24, wherein the outlet of the fan (74) of the dryer exhaust treatment system (7) passes through a fluidized gas line (741) and a composite dryer. The direct heat exchange chamber (602) of (6) is connected to the bottom heat chamber of the indirect heat exchange chamber (603).

40. The wet sludge incineration treatment apparatus according to claim 24, wherein the outlet of the blower (74) of the dryer exhaust treatment system (7) passes through a branch line (742) and an incinerator furnace (1) ) Connected.

A wet sludge incineration treatment apparatus with a composite dryer according to claim 24, wherein the inlet of the fine powder returner (711) is provided with a sanding port (713).

The wet sludge incineration treatment apparatus according to claim 24, wherein the inlet of the second screw feeder (712) is provided with a sanding port (713).

The wet sludge incineration treatment apparatus according to claim 20, wherein the fluidizing gas of the direct heat exchange chamber (602) and the indirect heat exchange chamber (603) is an inert gas or a cooled incinerator Smoke.