CN111453968B - Sludge drying and incineration coupling treatment system - Google Patents
Sludge drying and incineration coupling treatment system Download PDFInfo
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- CN111453968B CN111453968B CN202010268118.8A CN202010268118A CN111453968B CN 111453968 B CN111453968 B CN 111453968B CN 202010268118 A CN202010268118 A CN 202010268118A CN 111453968 B CN111453968 B CN 111453968B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
Abstract
The invention provides a sludge drying and incinerating coupling treatment system which comprises at least one high-temperature sludge oven and a low-temperature sludge oven, wherein a first steam pipe is arranged at the top end of the high-temperature sludge oven in a communicating mode and is branched into a first steam branch pipe and a second steam branch pipe, the first steam branch pipe penetrates through a heat exchanger and is communicated with a fluidized bed incinerator, the second steam branch pipe penetrates through a reheater and then is led into and communicated with the high-temperature sludge oven, a first air pipe is arranged at the top end of the low-temperature sludge oven in a communicating mode and penetrates through a water cooler and the heat exchanger in sequence and then is led into and communicated with the bottom end of the low-temperature sludge oven, and a flue gas pipe of the fluidized bed incinerator exchanges heat with the second steam branch pipe. The invention adopts a treatment mode of combining two-stage drying and incineration of sludge, realizes the final treatment of sludge, effectively improves the utilization rate of heat energy, and can completely meet the municipal sludge treatment requirement with generally low heat value.
Description
Technical Field
The invention relates to the technical field of sludge reduction in sludge industry, in particular to a sludge drying and incinerating coupled treatment system
Background
With the continuous development of domestic economy and urbanization, the sewage treatment capacity is continuously improved, the sludge amount of the final product of sewage treatment is also continuously increased, and the yield (the water content is 80%) of only municipal sludge in 2020 is estimated to reach 6000-9000 ten thousand tons. Sludge is an extremely complex heterogeneous body consisting of organic residues, inorganic particles, bacterial cells, colloids and the like, and the sludge needs to be subjected to deep dehydration and stabilization treatment in order to avoid secondary pollution. The domestic population density is large, the land resources are short, the traditional extensive treatment methods such as landfill and the like are difficult to continue, and therefore, the harmless treatment and disposal of the sludge are the key difficult problems in the environmental protection field. The sludge incineration technology is the most thorough treatment method recognized at home and abroad and is a main way for reducing and detoxifying municipal sludge.
The main sludge incineration technology at present has power plant mixing burning, domestic waste mixing burning, cement kiln cooperation burning and the like, and all faces the problems that the original incinerator is seriously corroded, the mixing burning capacity is limited, the influence of national policies is more, and the like, and independent sludge burning is the trend of future sludge burning disposal. Because domestic people's standard of living, sewage collection mode and pipe network silt are mixed into the scheduling problem, domestic municipal sludge calorific value is generally lower (the mud absolute dry heating value is about 2000 kcal/kg), need to heat auxiliary fuel when directly burning, increases sludge incineration operating cost, has greatly hindered the popularization and application of burning technology, needs a mummification burning technique that can be applicable to low calorific value mud urgently to realize sludge reduction, stabilization, innoxious, resourceful processing's processing.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a drying incineration treatment system suitable for low-heat-value sludge, so that the reduction, stabilization, harmless and recycling treatment of the sludge can be realized.
In order to achieve the aim, the invention provides a sludge drying and incinerating coupling treatment system which comprises at least one high-temperature sludge drying oven and a low-temperature sludge drying oven, wherein a wet sludge feeding hole and a dry sludge discharging hole are formed in the high-temperature sludge drying oven and the low-temperature sludge drying oven;
the top end of the high-temperature sludge drying oven is communicated with a first steam pipe, the first steam pipe is branched into two paths of a first steam branch pipe and a second steam branch pipe, the first steam branch pipe penetrates through a heat exchanger and is communicated with a fluidized bed incinerator, and the second steam branch pipe penetrates through a reheater and then is reintroduced into and communicated with the bottom end of the high-temperature sludge drying oven;
the top end of the low-temperature sludge oven is communicated with a first air pipe, and the first air pipe passes through a water cooler and the heat exchanger in sequence and then is led into and communicated with the bottom end of the low-temperature sludge oven again;
the fluidized bed incinerator is provided with a device for incinerating sludge, the fluidized bed incinerator is provided with a sludge feeding port and a smoke outlet, the sludge feeding port is communicated with two dry sludge discharging ports, the smoke outlet is communicated with a first smoke pipe, the other end of the first smoke pipe is communicated with a cyclone dust collector, the cyclone dust collector is communicated with a smoke treatment device through a second smoke pipe, and the second smoke pipe is communicated with a second steam branch pipe for heat exchange.
Furthermore, a plurality of layers of transmission mesh belts are arranged in the high-temperature sludge oven and the low-temperature sludge oven, a gas collecting device and a dust removing device are arranged at the top ends of the high-temperature sludge oven and the low-temperature sludge oven, and a centrifugal fan is arranged on the first steam pipe and the first air pipe.
Furthermore, a first condensate pipe is further arranged on the heat exchanger and communicated with a first steam branch pipe in the heat exchanger.
Further, the treatment system further comprises a preheater, the first air pipe and the first condensate pipe penetrate through the preheater, and the preheater is located between the water cooler and the heat exchanger.
Furthermore, the water cooler is communicated with a water cooling system, the water cooling system comprises a cooling tower, the cooling tower is connected with the water cooler through a cooling water pipe and a cooling water return pipe to form a cooling water circulation loop, a cooling water pump is arranged on the cooling water pipe, a cooling water supplement port is arranged on the cooling tower, a second condensation water pipe is further arranged on the water cooler, and the second condensation water pipe is communicated with a first air pipe in the water cooler.
Furthermore, the second flue gas pipe penetrates through a reheater, a steam circulation pipe for circulating steam is arranged between the reheater and the reheater, the steam circulation pipe in the reheater is close to the second flue gas pipe, and the steam circulation pipe in the reheater and the second steam branch pipe are close to each other
Furthermore, the fluidized bed incinerator is also provided with a fuel feeding port, an air inlet and a slag discharge port, and the sludge incineration device comprises an air conveying device arranged at the air inlet, an air distribution device arranged at the bottom end inside the fluidized bed incinerator and a slag storage bin communicated with the slag discharge port; the air inlet with the cinder discharging port is arranged on the bottom side wall of the fluidized bed incinerator, the air conveying device comprises an air blower and an air preheater communicated with the air blower through a ventilation pipe, the air preheater is arranged on the air inlet, the air distribution device is located on the upper layer of the plane where the air inlet in the fluidized bed incinerator is located, and the cinder storage bin is communicated with the cinder discharging port through a cinder discharging pipe.
Further, the bottom end of the cyclone dust collector is communicated with the sludge feeding hole through a slag material return pipe.
Further, flue gas processing apparatus includes the flue gas absorption tower, cyclone with the flue gas absorption tower passes through the second flue gas pipe intercommunication, the flue gas absorption tower passes through the third flue gas pipe intercommunication with a chimney, be provided with an draught fan on the third flue gas pipe.
Further, the top end of the flue gas absorption tower is also provided with a spraying device, the spraying device is communicated with the bottom end of the flue gas absorption tower through a feed liquid circulating pipe, and the feed liquid circulating pipe is provided with a feed liquid circulating pump.
The scheme of the invention has the following beneficial effects:
the sludge drying and incinerating coupled treatment system adopts a treatment mode of combining two-stage drying and incinerating of sludge, heat can be recycled between the two-stage drying treatment systems, for example, a heat exchanger, a reheater and the like are arranged, so that high-temperature steam can exchange heat with low-temperature air, waste heat generated after incineration can be further utilized, for example, high-temperature flue gas and high-temperature steam exchange heat, only a small amount of exogenous fuel is needed when the treatment system is started, the final treatment of sludge is realized, the utilization rate of heat energy is effectively improved, and the municipal sludge treatment requirement with generally low heat value can be completely met.
Drawings
Fig. 1 is a schematic view of the overall structure and connection of the present invention.
[ description of reference ]
1-high temperature sludge oven; 2-low temperature sludge oven; 3-a wet mud feeding port; 4-discharging the dry mud; 5-a first steam pipe; 5 a-a first steam branch pipe; 5 b-a second steam branch pipe; 6-a heat exchanger; 7-fluidized bed incinerator; 8-a reheater; 9-a first air tube; 10-a water cooler; 11-sludge feed inlet; 12-a flue gas outlet; 13-a first flue gas duct; 14-a cyclone dust collector; 15-a second flue gas pipe; 16-dry sludge conveying pipe; 17-a transmission mesh belt; 18-a gas collection device; 19-a dust removal device; 20-a centrifugal fan; 21-a first condensate pipe; 22-a preheater; 23-a cooling tower; 24-a cooling water pipe; 25-a cooling water return pipe; 26-a cooling water replenishing port; 27-a cooling water pump; 28-a second condensate pipe; 29-a heat regenerator; 30-steam circulation pipe; 31-a fuel feeding port; 32-air inlet; 33-a slag discharge port; 34-an air distribution device; 35-a slag storage bin; 36-a blower; 37-a vent tube; 38-air preheater; 39-a slag discharge pipe; 40-slag charge reflux pipe; 41-a flue gas absorption tower; 42-a chimney; 43-a third flue gas pipe; 44-a draught fan; 45-a spraying device; 46-feed liquid circulating pipe; 47-feed liquid circulating pump.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, an embodiment of the present invention provides a sludge drying and incinerating coupled treatment system, which includes at least one high temperature sludge oven 1 and one low temperature sludge oven 2, in this embodiment, the high temperature sludge oven 1 and the low temperature sludge oven 2 are provided to form a two-stage drying system, a wet sludge feeding port 3 and a dry sludge discharging port 4 are provided on each of the high temperature sludge oven 1 and the low temperature sludge oven 2, the wet sludge feeding port 3 is communicated with a sludge forming machine, formed sludge is guided into the sludge oven, the dry sludge discharging port 4 is communicated with a shaftless screw conveyor or scraper lifter, and a sealing heat preservation treatment is performed at the dry sludge discharging port 4, and dried sludge is guided out by the shaftless screw conveyor or scraper lifter.
The top end of the high-temperature sludge oven 1 is communicated with a first steam pipe 5, the other end of the first steam pipe 5 is branched into two paths of a first steam branch pipe 5a and a second steam branch pipe 5b, wherein the first steam branch pipe 5a penetrates through a heat exchanger 6 and is communicated with a fluidized bed incinerator 7, and the second steam branch pipe 5b penetrates through a reheater 8 and then is reintroduced into and communicated with the bottom end of the high-temperature sludge oven 1. The top end of the low-temperature sludge oven 2 is communicated with a first air pipe 9, and the first air pipe 9 passes through a water cooler 10 and a heat exchanger 6 in sequence and then is led into and communicated with the bottom end of the low-temperature sludge oven 2 again.
Be provided with the device of burning mud in the fluidized bed incinerator 7, be provided with mud feed inlet 11 and exhanst gas outlet 12 on the fluidized bed incinerator 7, mud feed inlet 11 and two dry mud discharge gates 4 intercommunication, exhanst gas outlet 12 intercommunication is provided with first flue gas pipe 13, the other end intercommunication a cyclone 14 of first flue gas pipe 13, cyclone 14 and a flue gas processing apparatus pass through second flue gas pipe 15 intercommunication, second flue gas pipe 15 divides pipe 5b with the second steam and takes place the heat transfer.
Specifically, the drying temperature in the high-temperature sludge oven 1 is controlled to be about 100 ℃, steam is used for drying sludge in the high-temperature sludge oven 1, absorbing moisture and releasing heat to generate saturated steam at about 100 ℃, the first path of saturated steam enters the first steam branch pipe 5a, is cooled after heat release through the heat exchanger 6 to generate condensed water and uncondensed steam, and the residual uncondensed steam is continuously guided into the fluidized bed incinerator 7 through the first steam branch pipe 5a to be incinerated. And a second path of saturated steam with the temperature of 100 ℃ enters the second steam branch pipe 5b, passes through the reheater 8, is reheated to generate superheated steam with the temperature of about 150 ℃, and is reintroduced into the bottom end of the high-temperature sludge drying oven 1 along the second steam branch pipe 5b to continuously dry and dehumidify sludge.
The drying temperature in the low-temperature sludge oven 2 is controlled to be about 55 ℃, dry hot air at about 90 ℃ is guided into the low-temperature sludge oven 2 from the bottom end by the first air pipe 9, wet cold air at about 55 ℃ is generated after drying sludge and absorbing moisture and releasing heat, the wet cold air passes through the water cooler 10 provided with the fin heat exchange device along the first air pipe 9 at the top end, and is cooled to about 34 ℃, so that cooling and dehumidification are completed, and condensed water is generated. And then the residual air continuously passes through the heat exchanger 6 with the same fin heat exchange device along the first air pipe 9 to exchange heat with the saturated steam in the first steam branch pipe 5a, so that air with the temperature of about 90 ℃ is generated again, and the air is guided into the bottom end of the low-temperature sludge oven 2 along the first air pipe 9 to continuously dry and dehumidify the sludge.
The sludge dried by the high-temperature sludge oven 1 and the low-temperature sludge oven 2 is guided into the fluidized bed incinerator 7 from the sludge feeding port 11 through the dry sludge conveying pipe 16 for further incineration treatment, the flue gas at about 900 ℃ generated after incineration is guided into the cyclone dust collector 14 along with the first flue gas pipe 13, the cyclone dust collector 14 separates solid particles in the flue gas, the residual flue gas is guided into the second flue gas pipe 15, exchanges heat with 100 ℃ saturated steam in the second steam branch pipe 5b, heats the steam, and is finally guided into the flue gas treatment device for treatment and then is discharged.
Therefore, the sludge treatment system adopts a treatment mode of combining two-stage drying and incineration of the sludge, heat can be recycled between the two-stage drying treatment system, waste heat generated after incineration can be further utilized, only a small amount of exogenous fuel is needed when the sludge treatment system is started, the final treatment of the sludge is realized, the utilization rate of heat energy is effectively improved, and the municipal sludge treatment requirement with a generally low heat value can be completely met.
Further, a plurality of layers of transmission mesh belts 17 are arranged in the high-temperature sludge drying oven 1 and the low-temperature sludge drying oven 2, the transmission mesh belts 17 can be arranged in three to four layers, and the movement directions between the adjacent transmission mesh belts 17 are opposite, so that the flowing distance of the dry hot air in the two sludge drying ovens and the contact area of the dry hot air and the sludge are larger, and the drying effect is better. In addition, the top ends of the high-temperature sludge oven 1 and the low-temperature sludge oven 2 are both provided with a gas collecting device 18 and a dust removing device 19, the gas collecting device 18 collects wet air absorbing moisture at the top end of the sludge oven, and fine sludge particles in the wet air are removed by the dust removing device 19 such as a plate type dust remover or a bag-type dust remover, so that the wet air is prevented from entering the first steam pipe 5 or the first air pipe 9. The first steam pipe 5 and the first air pipe 9 are both provided with a centrifugal fan 20, and steam or air is sucked out from the top end of the sludge oven and conveyed to the other end of the pipeline under the action of the centrifugal fan 20.
Furthermore, a first condensate pipe 21 is further arranged on the heat exchanger 6, and the first condensate pipe 21 is communicated with a first steam branch pipe 5a positioned in the heat exchanger 6, so that condensate water generated after the first steam branch pipe 5a releases heat through the heat exchanger 6 can be discharged outwards.
Further, the treatment system according to this embodiment further includes a preheater 22, the first air pipe 9 and the first condensed water pipe 21 are disposed through the preheater 22, and the temperature of the condensed water in the first condensed water pipe 21 is still high, so that the recovered heat can be reused to heat the air in the first air pipe 9 to preheat the air before entering the heat exchanger 6.
Further, the water cooler 10 is connected to a water cooling system. In this embodiment, the water cooling system includes a cooling tower 23, the cooling tower 23 is connected with the water cooler 10 through a cooling water pipe 24 and a cooling water return pipe 25 to form a cooling water circulation loop, a cooling water supplement port 26 is provided on the cooling tower 23, the cooling water is driven by a cooling water pump 27 to flow into the water cooler 10, and the cooling water exchanges heat with the wet air in the first air pipe 9 and then flows back to the cooling tower 23 through the circulation loop, so as to transfer and release the absorbed heat. In addition, the water cooler 10 is further provided with a second condensate pipe 28 which is communicated with the first air pipe 9 positioned in the water cooler 10, so that condensate water generated after the first air pipe 9 releases heat through the water cooler 10 can be discharged to the outside.
Further, the second flue gas pipe 15 is arranged to pass through a heat regenerator 29, and the flue gas with the temperature of 900 ℃ after dust removal in the second flue gas pipe 15 is introduced into the heat regenerator 29. Meanwhile, a steam circulation pipe 30 is arranged between the heat regenerator 29 and the reheater 8, and the high-temperature flue gas heats the saturated steam at 100 ℃ through the heat carried by the steam circulating in the steam circulation pipe, so that the superheated steam at 150 ℃ is regenerated. Wherein, the steam circulation pipe 30 in the heat regenerator 29 is coiled with the second flue gas pipe 15, and the steam circulation pipe 30 in the reheater 8 is coiled with the second steam branch pipe 5b, so as to increase the heat exchange area.
Furthermore, the fluidized bed incinerator 7 is also provided with a fuel feeding port 31, an air inlet 32 and a slag discharge port 33, and fuel is directly fed into the incinerator from the fuel feeding port 31 through a fuel feeding device. The device for incinerating sludge comprises an air conveying device arranged at an air inlet 32, an air distribution device 34 arranged at the bottom end inside the fluidized bed incinerator 7 and a slag storage bin 35 communicated with a slag discharge port 33. The air inlet 32 and the slag discharge port 33 are both arranged on the side wall of the bottom end of the fluidized bed incinerator 7, the air conveying device comprises an air blower 36 and an air preheater 38 communicated with the air blower 36 through a vent pipe 37, the air preheater 38 is arranged on the air inlet 32, the air blower 36 guides air into the air preheater 38, the preheated air flows into the fluidized bed incinerator 7, the air is uniformly guided upwards to support combustion through an air distribution device 34 arranged on the upper layer of the plane where the air inlet 32 is located, and the slag storage bin 35 is communicated with the slag discharge port 33 through a slag discharge pipe 39, so that the burned slag flows into the slag storage bin 35 to be recycled.
Further, the bottom end of the cyclone dust collector 14 is communicated with the sludge feeding hole 11 through a slag material return pipe 40, so that after the cyclone dust collector 14 removes and retains the sludge solid particles in the flue gas, the sludge solid particles can flow back to the fluidized bed incinerator 7 through the slag material return pipe 40 again for incineration treatment, and the sludge incineration treatment degree is improved.
Further, the flue gas treatment device comprises a flue gas absorption tower 41, the cyclone dust collector 14 is communicated with the flue gas absorption tower 41 through a second flue gas pipe 15, the flue gas absorption tower 41 is communicated with a chimney 42 through a third flue gas pipe 43, and an induced draft fan 44 is arranged on the third flue gas pipe 43 and guides the flue gas treated in the flue gas absorption tower 41 into the chimney 42 for discharge. Wherein, the top of flue gas absorption tower 41 is provided with a spray set 45, spray set 45 and the bottom of flue gas absorption tower 41 are through a feed liquid circulating pipe 46 intercommunication, spray set 45 will handle the feed liquid of flue gas and spray from the top of flue gas absorption tower 41 downwards, through feed liquid circulating pump 47, make the area of contact of feed liquid and flue gas bigger, can absorb the harmful substance in the flue gas more thoroughly.
For example, the absolute dry heat value is 2000Kcal/kg, wet sludge with the water content of 80% (low-grade heat value-32 Kcal/kg) is dried to the water content of 30% (low-grade heat value 1238Kcal/kg) and enters the fluidized bed incinerator 7 to be incinerated, and the incineration flue gas waste heat is recycled as a drying heat source. 1 ton of dried residual sludge with the water content of 80 percent is 0.286 ton, and the dehydration amount is 0.714 ton; the energy consumption of the two-stage drying system is calculated to be 0.6 ton of steam/ton of water (6bar saturated steam pressure), and the steam quantity required by drying 1 ton of sludge is 0.428 ton (6bar saturated steam pressure); 0.286 ton of flue gas waste heat (the waste heat recovery rate is calculated according to 80%) with the water content of 30% after incineration is converted into 0.43 ton of steam, the heat recovered by incineration of dried sludge can meet the drying requirement, and the sludge with low heat value is realized
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A sludge drying and incinerating coupling treatment system is characterized by comprising at least one high-temperature sludge drying oven and a low-temperature sludge drying oven, wherein a wet sludge feeding hole and a dry sludge discharging hole are formed in the high-temperature sludge drying oven and the low-temperature sludge drying oven;
the top end of the high-temperature sludge drying oven is communicated with a first steam pipe, the first steam pipe is branched into two paths of a first steam branch pipe and a second steam branch pipe, the first steam branch pipe penetrates through a heat exchanger and is communicated with a fluidized bed incinerator, and the second steam branch pipe penetrates through a reheater and then is reintroduced into and communicated with the bottom end of the high-temperature sludge drying oven;
the top end of the low-temperature sludge oven is communicated with a first air pipe, and the first air pipe passes through a water cooler and the heat exchanger in sequence and then is led into and communicated with the bottom end of the low-temperature sludge oven again;
a device for incinerating sludge is arranged in the fluidized bed incinerator, a sludge feeding hole and a smoke outlet are arranged on the fluidized bed incinerator, the sludge feeding hole is communicated with the two dry sludge discharging holes, the smoke outlet is communicated with a first smoke pipe, the other end of the first smoke pipe is communicated with a cyclone dust collector, the cyclone dust collector is communicated with a smoke treatment device through a second smoke pipe, and the second smoke pipe exchanges heat with the second steam branch pipe;
the heat exchanger is also provided with a first condensate pipe, and the first condensate pipe is communicated with a first steam branch pipe positioned in the heat exchanger;
the first air pipe and the first condensate pipe both penetrate through the preheater, and the preheater is positioned between the water cooler and the heat exchanger;
the water cooler is communicated with a water cooling system, the water cooling system comprises a cooling tower, the cooling tower and the water cooler are connected through a cooling water pipe and a cooling water return pipe to form a cooling water circulation loop, a cooling water pump is arranged on the cooling water pipe, a cooling water supplement port is arranged on the cooling tower, a second condensate pipe is further arranged on the water cooler, and the second condensate pipe is communicated with a first air pipe in the water cooler;
the second flue gas pipe penetrates through a reheater, a steam circulating pipe for circulating steam is arranged between the reheater and the reheater, the steam circulating pipe in the reheater is close to the second flue gas pipe, and the steam circulating pipe in the reheater is close to the second steam branch pipe.
2. The sludge drying and incinerating coupled treatment system according to claim 1, wherein a plurality of layers of transmission mesh belts are arranged in the high-temperature sludge drying oven and the low-temperature sludge drying oven, a gas collecting device and a dust removing device are arranged at the top ends of the high-temperature sludge drying oven and the low-temperature sludge drying oven, and a centrifugal fan is arranged on each of the first steam pipe and the first air pipe.
3. The sludge drying and incinerating coupled treatment system according to claim 1, wherein the fluidized bed incinerator is further provided with a fuel feeding port, an air inlet and a slag discharge port, and the sludge incineration device comprises an air conveying device arranged at the air inlet, an air distribution device arranged at the bottom end inside the fluidized bed incinerator, and a slag storage bin communicated with the slag discharge port; the air inlet with the cinder discharging port is arranged on the bottom side wall of the fluidized bed incinerator, the air conveying device comprises an air blower and an air preheater communicated with the air blower through a ventilation pipe, the air preheater is arranged on the air inlet, the air distribution device is located on the upper layer of the plane where the air inlet in the fluidized bed incinerator is located, and the cinder storage bin is communicated with the cinder discharging port through a cinder discharging pipe.
4. The sludge drying and incinerating coupled treatment system as claimed in claim 1, wherein the bottom end of the cyclone dust collector is communicated with the sludge feed port through a slag return pipe.
5. The sludge drying incineration coupling treatment system according to claim 1, wherein the flue gas treatment device comprises a flue gas absorption tower, the cyclone dust collector is communicated with the flue gas absorption tower through the second flue gas pipe, the flue gas absorption tower is communicated with a chimney through a third flue gas pipe, and a draught fan is arranged on the third flue gas pipe.
6. The sludge drying and incinerating coupled treatment system according to claim 5, wherein a spray device is further disposed at the top end of the flue gas absorption tower, the spray device is communicated with the bottom end of the flue gas absorption tower through a feed liquid circulating pipe, and a feed liquid circulating pump is disposed on the feed liquid circulating pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010268118.8A CN111453968B (en) | 2020-04-08 | 2020-04-08 | Sludge drying and incineration coupling treatment system |
Applications Claiming Priority (1)
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| CN115947521B (en) * | 2022-12-27 | 2023-08-15 | 湖南清源华建环境科技有限公司 | Heat pump sludge drier system |
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| CN102353061A (en) * | 2011-08-19 | 2012-02-15 | 宁波互联聚能环保技术有限公司 | System and method for comprehensively utilizing sludge drying and burning waste heats stepwise |
| KR20140028407A (en) * | 2012-08-29 | 2014-03-10 | 박준호 | Sludge carbonizing system, and byproduct fuel extraction method |
| CN104033911A (en) * | 2014-06-30 | 2014-09-10 | 南京德邦金属装备工程股份有限公司 | Sludge drying and incinerating system |
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| CN110255856A (en) * | 2019-07-29 | 2019-09-20 | 湖南清源智造设备有限公司 | Steam heat pump sludge drying system |
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| CN102353061A (en) * | 2011-08-19 | 2012-02-15 | 宁波互联聚能环保技术有限公司 | System and method for comprehensively utilizing sludge drying and burning waste heats stepwise |
| KR20140028407A (en) * | 2012-08-29 | 2014-03-10 | 박준호 | Sludge carbonizing system, and byproduct fuel extraction method |
| CN104033911A (en) * | 2014-06-30 | 2014-09-10 | 南京德邦金属装备工程股份有限公司 | Sludge drying and incinerating system |
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