CN110776238A - Steam heat source sludge drying system and sludge drying method thereof - Google Patents

Steam heat source sludge drying system and sludge drying method thereof Download PDF

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Publication number
CN110776238A
CN110776238A CN201810754477.7A CN201810754477A CN110776238A CN 110776238 A CN110776238 A CN 110776238A CN 201810754477 A CN201810754477 A CN 201810754477A CN 110776238 A CN110776238 A CN 110776238A
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Prior art keywords
steam
sludge
water
drying
heat
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李洪荣
雷海森
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Qingdao Furong Huaxin Environmental Protection Energy Science And Technology Ltd Co
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Qingdao Furong Huaxin Environmental Protection Energy Science And Technology Ltd Co
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Priority to CN201810754477.7A priority Critical patent/CN110776238A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1487—Removing organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/52—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/02—Odour removal or prevention of malodour
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/10—Energy recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The invention belongs to the technical field of deep dehydration of sludge, and particularly relates to a steam heat source sludge drying system and a sludge drying method thereof. The system consists of a drying device, a cyclone dust removal device, a waste heat recovery device, a waste gas treatment device and a conveying device. In order to overcome the defects of the existing sludge steam drying technology, the invention can recycle the heat energy stored in the steam to the maximum extent, greatly save the consumption of the steam and greatly save the operating cost. The problem of the sludge moisture content after the prior art dehydration is high is solved to further improve sludge dewatering efficiency. The invention has the beneficial effects that: the occupied area of the equipment is small, and the civil engineering investment is extremely low; the energy consumption is extremely low; the steam application range is wide; the heat exchange efficiency is high; the equipment is safe and stable in operation, and the failure rate is extremely low; the environmental protection advantage is obvious; the whole investment cost is low, the production cost is reduced, and the economic benefit of enterprises is increased.

Description

Steam heat source sludge drying system and sludge drying method thereof
Technical Field
The invention belongs to the technical field of deep dehydration of sludge, and particularly relates to a steam heat source sludge drying system and a sludge drying method thereof.
Background
The sewage sludge is the main waste of sewage treatment plants, and the treatment problem becomes a great problem of the sewage treatment plants. The current sewage sludge treatment process is as follows: the method comprises the following steps of firstly concentrating the residual sludge in a gravity concentration tank until the water content is about 98-97%, tempering the concentrated sludge by using a cationic polyacrylamide solution, then mechanically dehydrating, and transporting and disposing the dehydrated sludge from a sewage treatment plant.
A sewage treatment plant needs to generate a large amount of sludge during sewage treatment, a belt filter is generally adopted for dehydration in the sewage treatment plant, and the water content of the dehydrated sludge is generally about 80%. The final disposal of these sludges generally has several routes: (1) burying; (2) burning; (3) compost, and the like. Regardless of the final disposal route, the 80% water cut is too high. Under the common conditions, the water content of the sludge is an important control index in the drying process of the sludge, and if the water content of the sludge is too low, too much dust is generated and explosion danger is easy to occur; when the water content is too high, the purpose of deep dehydration can not be achieved, and the difficulty of final treatment of the sludge is increased.
In the existing sludge deep dehydration technology, two types are most commonly adopted at present: (1) a high-pressure plate frame; (2) and (5) drying by steam. Among them, high-pressure plate frames are the mainstream at present. The greatest advantage of the high-pressure plate frame over steam drying is that the operating costs are relatively inexpensive, and the direct cost of treating wet sludge per ton is between about 60 and 90 yuan per ton. However, the disadvantages of high pressure plate frames are also apparent: (1) the dewatering effect is far inferior to that of a steam drying technology, and the water content of the sludge can be greatly reduced and even can be reduced to zero by the steam drying technology. But the high-pressure plate frame has certain difficulty in reducing the water content to below 50 percent; (2) too large dosage, high labor intensity and large occupied area. Compared with a high-pressure plate frame, the steam drying technology has the defect of high operation cost (the direct cost for drying wet sludge per ton is about 400-600 yuan/ton), but has the advantages of good sludge dewatering effect (the drying degree can be manually controlled, even the moisture content can be reduced to nearly 40%), no addition of any medicament and the like.
From the above, the only factor restricting the large-scale application of the sludge steam drying technology is the high operation cost. The largest part of the sludge drying cost is the steam cost, which is nearly 90%. In fact, considerable waste exists in the sludge drying technology, water originally stored in sludge is changed into water vapor after being dried, and the water vapor contains a large amount of enthalpy and white loss, so that the water vapor cannot be effectively utilized.
Disclosure of Invention
In order to overcome the defects of the existing sludge steam drying technology, the invention provides a steam heat source sludge drying system and a sludge drying method thereof, which can recycle the heat energy stored in steam to the maximum extent, greatly save the consumption of raw steam and greatly save the operating cost. The invention aims to solve the problem of high water content of the dewatered sludge, and provides a steam heat source sludge drying system which is suitable for treating excess sludge and concentrated sludge generated in a sewage treatment plant so as to further improve the sludge dewatering efficiency.
The invention is realized by the following modes:
a steam heat source sludge drying system is composed of a drying device, a cyclone dust removal device, a waste heat recovery device, a waste gas treatment device and a conveying device.
Further, in the above steam heat source sludge drying system, the drying device is a reverse blade paddle dryer. The main equipment of the process system adopts a reverse tooth returning technology and a dividing wall heat transfer technology, the heat exchange efficiency reaches more than 95%, the overall heat efficiency exceeds 86%, sludge with the water content of about 80% can be dried to the water content of less than 25%, and meanwhile, the steam condensate water can return to a deaerator to recover the condensate water and heat by the excellent dividing wall heat transfer technology without being polluted.
Further, in the steam heat source sludge drying system, the cyclone dust removal device comprises a cyclone dust collector, the inlet end of the cyclone dust collector is connected with the induced draft fan, and the outlet end of the cyclone dust collector is connected with the waste gas treatment device; after the cyclone dust collector settles the large particles in the waste gas introduced by the draught fan from the drying device, the large particles enter the waste gas treatment device to treat the micro-dust particles and the VOC gas.
Furthermore, according to the steam heat source sludge drying system, the waste heat recovery device comprises the front heat exchanger and the deep heat recoverer which are connected into a pyramid structure for heat recovery, in the recovery process, water vapor in tail gas is condensed into water, the condensed water is rinsed to remove oil and then sent into the desulfurizing tower to be used as high-quality water supplement, and the residual air (containing trace organic volatile gas) is sent into the desulfurizing tower to be diluted and then is exhausted to the atmosphere.
Further, according to the steam heat source sludge drying system, the waste gas treatment device adopts a high-temperature comprehensive treatment tower for spray washing, most of steam in the tail gas is sent to the waste heat recovery device for utilization after being washed, only a few of steam is condensed into water to form discharged waste water, and therefore the discharge amount of the waste water is controlled within 2 t/h. The comprehensive treatment tower is provided with a settling tank, a dosing system and the like, and harmful substances such as hydrogen sulfide and the like in the water vapor are neutralized and removed in a mode of adding medicaments and the like; the generation of odor is avoided; tail gas evaporated from the blade-reversing paddle dryer is dedusted and deodorized by the comprehensive treatment tower, cooled by the deep heat recoverer, and subjected to harmful substance removal, and then directly deodorized and discharged or sent to a boiler to be used as secondary air.
Furthermore, according to the steam heat source sludge drying system, the preheating conveying system is connected with the drying device, the drying device is connected with the cyclone dust removal device, and the cyclone dust removal device is externally connected with the spiral steam pipeline.
The method for drying the sludge of the steam heat source sludge drying system comprises the following steps:
(1) the wet sludge of the project is conveyed into a sealed wet sludge warehouse for temporary storage after being transported into a factory by an automobile, then the sludge with the water content of less than 65 percent is conveyed into a reverse blade paddle type dryer for heating and drying in a sealing way by a sludge pump through a special sludge warehouse bottom discharger and a buried scraper conveyor, and the heating steam is directly cooled into condensed water in the reverse blade paddle type dryer and is discharged through a conversion joint.
(2) And waste gas generated in the sludge drying process is discharged by a draught fan, and the micro-negative pressure operation of the reverse-blade paddle type dryer, auxiliary equipment and system pipelines is maintained.
(3) The extracted waste gas (gas such as steam and air mixture, voc and the like) is pretreated by a cyclone dust collector and then continuously enters a high-temperature comprehensive treatment tower for spraying and washing, most of steam in tail gas is washed and then sent into a heat recovery device for recycling, only a few of steam is condensed into water to form discharged wastewater, so that the discharge amount of the wastewater is controlled within 2t/h, the comprehensive treatment tower is provided with a settling tank, a dosing system and the like, and harmful substances such as hydrogen sulfide and the like in the steam are neutralized and removed in a mode of adding medicaments and the like; the generation of odor is avoided; tail gas evaporated from the blade-reversing paddle dryer is dedusted and deodorized by the comprehensive treatment tower, cooled by the deep heat recoverer, and subjected to harmful substance removal, and then directly deodorized and discharged or sent to a boiler to be used as secondary air.
(4) The spraying liquid utilized by the comprehensive treatment tower enters a circulating water tank, on one hand, the sprayed water is subjected to precipitation treatment, on the other hand, the spraying water is recycled, and the generation amount of waste water is reduced. And conveying the precipitate in the wastewater to a wet sludge bin in a closed manner through a scraper conveyor.
(5) The gas treated by spraying enters a front heat exchanger to carry out first waste heat utilization, the temperature of the treated gas (water vapor) is above 80 ℃ through a draught fan, and one part of the treated gas enters a deep heat recoverer and the other part of the treated gas returns to a steam pipeline to be used as a drying steam supplementary heat source.
(6) After being treated by the comprehensive tower, the tail gas continuously enters the deep heat recoverer for waste heat utilization, and the mixed water of the steam condensate water and the desalted water conveyed from the inside of the reverse-blade paddle type dryer is heated and then sent into a thermodynamic system of a power plant for continuous cyclic utilization.
(7) And in the deep heat recovery process, water vapor in the tail gas is condensed into water, the condensed water is rinsed and deoiled and then is sent into a cooling tower to be used as water supplement, and air is sent into a boiler to be incinerated.
(8) The dried sludge is conveyed to a dry sludge storage area through a pipe chain type annular conveyor special for dry sludge, the dried sludge is mixed with coal in proportion and then is used as fuel for incineration treatment, and steam generated in the incineration process is recycled and continuously used as a heat source for sludge drying, so that cyclic utilization is realized.
The invention has the beneficial effects that:
1. the occupied area is small, and the civil engineering investment is extremely low:
the whole floor area (including a host, an auxiliary machine, a wet sludge bin and the like) of 200 tons of sludge drying scale (200 tons per day) is 550 square meters, and the whole investment of civil engineering parts is less than 120 ten thousand yuan.
2. The energy consumption is extremely low:
heat power consumed per ton of water evaporated: 813 kWh/ton (index of dryer)
Reducing 80% moisture to 30% moisture, and steam consumption: 0.88t steam/wet ton
Reducing the water content of 70 percent to 20 percent, and reducing the steam consumption: 0.73t steam/wet ton
Steam consumption after heat recovery of drying waste gas: 0.15t steam/wet ton
Power consumption: < 10 kWh/wet ton (full set of configuration power < 120kW)
3. The steam application range is wide:
the steam is used and covers saturated steam and superheated steam. The maximum inlet temperature can reach 300 ℃, the inlet pressure can reach 0.9MPa, the matching of a power station boiler is facilitated, the facility is simplified, and a desuperheater is not required to be arranged, so that the overall investment cost is low.
4. The heat exchange efficiency is high:
the heating steam is directly cooled into condensed water in the dryer, and an external steam cooler is not needed, so that the drying steam consumption is reduced, and the overall investment cost is also reduced.
5. The equipment operation is safe and stable, and the failure rate is extremely low:
because reasonable in design has simplified most auxiliary engine relative to other drying equipment, therefore the fault rate is extremely low, is less than other drying equipment far away. Meanwhile, the reduction of the gas carrying amount greatly reduces the oxygen content of the gas in the drying process, and reduces the risk of explosion of the drying equipment in normal operation to zero.
6. The environmental protection advantage is obvious:
the drying system adopts a waste gas treatment mode combining a high-temperature waste gas treatment system and a deep heat recovery system, so that the waste water production amount is only within 1t/h in the drying process and is less than one twentieth of that of other drying systems. The exhaust gas treatment capacity is not half of that of other treatment systems.
7. The overall investment cost is low:
due to the special structural design of the dryer and the integral optimization of the system, the total investment (including civil engineering) of the drying system is 400 ten thousand yuan/one million ton lower than that of domestic similar products and is 1000 ten thousand yuan/one million ton lower than that of foreign similar products.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a flow chart of a sludge drying process performed by the sludge drying system of the present invention.
In the figure: 1. storing the sealed wet sludge; 2. a sludge pump; 3. a dry sludge storage area; 4. a disc-type annular dry sludge conveyor; 5. a counter-blade paddle dryer; 6. a cyclone dust collector; 7. an induced draft fan; 8. a scraper conveyor; 9. a comprehensive treatment tower; 10. a circulating water tank; 11. a water mixing tank; 12. a front heat exchanger; 13. a deep heat recovery unit; 14. and (4) floating the pond.
The specific implementation mode is as follows:
the invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings.
As shown in figure 1, the steam heat source sludge drying system is composed of a drying device, a cyclone dust removal device, a waste heat recovery device, a waste gas treatment device and a conveying device.
Further, in the above steam heat source sludge drying system, the drying device is a reverse blade paddle dryer 5. The main equipment of the process system adopts a reverse tooth returning technology and a dividing wall heat transfer technology, the heat exchange efficiency reaches more than 95%, the overall heat efficiency exceeds 86%, sludge with the water content of about 80% can be dried to the water content of less than 25%, and meanwhile, the steam condensate water can return to a deaerator to recover the condensate water and heat by the excellent dividing wall heat transfer technology without being polluted.
Further, in the steam heat source sludge drying system, the cyclone dust removal device comprises a cyclone dust collector 6, the inlet end of the cyclone dust collector 6 is connected with the induced draft fan 7, and the outlet end of the cyclone dust collector 6 is connected with the waste gas treatment device; cyclone 6 subsides the back with draught fan 7 from the big granule in the waste gas that drying device introduced, gets into exhaust treatment device and handles micronic dust particulate matter and VOC gas.
Further, according to the steam heat source sludge drying system, the waste heat recovery device comprises the front heat exchanger 12 and the deep heat recoverer 13 which are connected into a pyramid structure for heat recovery, in the recovery process, water vapor in tail gas is condensed into water, the condensed water is rinsed to remove oil and then is sent into the desulfurizing tower to be used as high-quality water supplement, and the rest air (containing trace organic volatile gas) is sent into the desulfurizing tower to be diluted and then is exhausted to the atmosphere.
Further, according to the steam heat source sludge drying system, the waste gas treatment device adopts the high-temperature comprehensive treatment tower 9 for spray washing, most of steam in the tail gas is sent to the waste heat recovery device for utilization after being washed, only a few of steam is condensed into water to form discharged waste water, and therefore the discharge amount of the waste water is controlled within 2 t/h. The comprehensive treatment tower 9 is provided with a sedimentation tank, a dosing system and the like, and harmful substances such as hydrogen sulfide and the like in the water vapor are neutralized and removed in a mode of adding medicaments and the like; the generation of odor is avoided; the tail gas evaporated from the reverse blade paddle type dryer 5 is dedusted and deodorized by the comprehensive treatment tower 9, is cooled by the deep heat recoverer 13, is deodorized directly after harmful substances are removed, and is discharged or is sent to a boiler as secondary air.
Furthermore, according to the steam heat source sludge drying system, the preheating conveying system is connected with the drying device, the drying device is connected with the cyclone dust removal device, and the cyclone dust removal device is externally connected with the spiral steam pipeline.
The method for drying the sludge of the steam heat source sludge drying system comprises the following steps:
(1) the wet sludge of the project is conveyed into a sealed wet sludge warehouse 1 for temporary storage after being transported into a factory by an automobile, then the sludge with the water content of less than 65 percent is conveyed into a reverse blade paddle type dryer 5 in a sealing way by a sludge pump 2 through a special sludge warehouse bottom discharger and an embedded scraper conveyor 8 for heating and drying, and the heating steam is directly cooled into condensed water in the reverse blade paddle type dryer 5 and is discharged through a conversion joint.
(2) And the waste gas generated in the sludge drying process is discharged through a draught fan 7, and the micro-negative pressure operation of the reverse-blade paddle type dryer 5, auxiliary equipment and system pipelines is maintained.
(3) The extracted waste gas (gas such as steam and air mixture, voc and the like) is pretreated by a cyclone dust collector 6 and then continuously enters a high-temperature comprehensive treatment tower 9 for spraying and washing, most of steam in tail gas is washed and then sent to a heat recoverer for recycling, only a few of steam is condensed into water to form discharged wastewater, so that the discharge amount of the wastewater is controlled within 2t/h, the comprehensive treatment tower 9 is provided with a settling tank, a dosing system and the like, and harmful substances such as hydrogen sulfide and the like in the steam are neutralized and removed in a mode of adding medicaments and the like; the generation of odor is avoided; the tail gas evaporated from the reverse blade paddle type dryer 5 is dedusted and deodorized by the comprehensive treatment tower 9, is cooled by the deep heat recoverer 13, is deodorized directly after harmful substances are removed, and is discharged or is sent to a boiler as secondary air.
(4) The spray liquid utilized by the comprehensive treatment tower 9 enters a circulating water tank 10, on one hand, the sprayed water is subjected to precipitation treatment, on the other hand, the spray water is recycled, and the generation amount of waste water is reduced. The sediment in the wastewater is hermetically conveyed to a wet sludge bin through a scraper conveyor 8.
(5) The gas treated by spraying enters a front heat exchanger 12 for first waste heat utilization, the temperature of the treated gas (water vapor) is above 80 ℃ through an induced draft fan 7, one part of the treated gas enters a deep heat recoverer 13, and the other part of the treated gas returns to a steam pipeline and is used as a drying steam supplementary heat source.
(6) After being treated by the comprehensive tower, the tail gas continuously enters the deep heat recoverer 13 for waste heat utilization, and the mixed water of the steam condensate water and the desalted water conveyed from the inside of the reverse-blade paddle type dryer 5 is heated and then sent to a thermodynamic system of the power plant for continuous cyclic utilization.
(7) And in the deep heat recovery process, water vapor in the tail gas is condensed into water, the condensed water is rinsed and deoiled and then is sent into a cooling tower to be used as water supplement, and air is sent into a boiler to be incinerated.
(8) The dried sludge is conveyed to a dry sludge storage area 3 through a pipe chain type annular conveyor special for dry sludge, the dried sludge is mixed with coal in proportion and then is used as fuel for incineration treatment, and steam generated in the incineration process is recycled and continuously used as a heat source for sludge drying, so that cyclic utilization is realized.
It is to be emphasized that: the above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.

Claims (7)

1. The steam heat source sludge drying system is characterized by comprising a drying device, a cyclone dust removal device, a waste heat recovery device, a waste gas treatment device and a conveying device.
2. The steam heat source sludge drying system as claimed in claim 1, wherein the drying device is a reverse blade paddle dryer (5), main equipment of the process system uses a reverse tooth return technology and a partition wall heat transfer technology, the heat exchange efficiency reaches more than 95%, the overall heat efficiency exceeds 86%, sludge with the water content of about 80% can be dried to the water content of less than 25%, and meanwhile, the steam condensate water can be returned to the deaerator to recover the condensate water and heat through the excellent partition wall heat transfer technology without being polluted.
3. The steam heat source sludge drying system as claimed in claim 1, wherein the cyclone dust removal device comprises a cyclone dust collector (6), the inlet end of the cyclone dust collector (6) is connected with an induced draft fan (7), and the outlet end of the cyclone dust collector (6) is connected with an exhaust gas treatment device; cyclone (6) subsides the back with draught fan (7) from the big granule in the waste gas that drying device introduced, gets into exhaust treatment device and handles micronic dust particulate matter and VOC gas.
4. The system as claimed in claim 1, wherein the waste heat recovery device comprises a front heat exchanger (12) and a deep heat recovery device (13), which are connected to form a pyramid structure for heat recovery, during the recovery process, water vapor in the tail gas is condensed into water, the condensed water is rinsed to remove oil and then sent to the desulfurization tower as a high-quality supplemented water, and the residual air (containing a very small amount of organic volatile gas) is sent to the desulfurization tower to be diluted and then exhausted to the atmosphere.
5. The steam heat source sludge drying system as claimed in claim 1, wherein the waste gas treatment device adopts a high temperature comprehensive treatment tower (9) for spray washing, most of steam in the tail gas is sent to a waste heat recovery device for utilization after being washed, only a few of steam is condensed into water to form discharged wastewater, so that the discharge amount of the wastewater is controlled within 2t/h, the comprehensive treatment tower (9) is provided with a settling tank, a dosing system and the like, and harmful substances such as hydrogen sulfide and the like in the steam are neutralized and removed in a manner of adding a medicament and the like; the generation of odor is avoided; tail gas evaporated from the reverse blade paddle type dryer (5) is subjected to dust removal and odor removal by a comprehensive treatment tower (9), is cooled by a deep heat recoverer (13), is subjected to harmful substance removal, and is directly subjected to deodorization and then discharged or is sent to a boiler to be used as secondary air.
6. The steam heat source sludge drying system as claimed in claim 1, wherein the preheating conveying system is connected with the drying device, the drying device is connected with the cyclone dust removing device, and the cyclone dust removing device is externally connected with a spiral steam pipeline.
7. A method for drying sludge of a steam heat source sludge drying system is characterized by comprising the following steps:
(1) the wet sludge of the project is conveyed into a sealed wet sludge warehouse (1) for temporary storage after being transported into a factory by an automobile, then the sludge with the water content of less than 65 percent is conveyed into a reverse-blade paddle type dryer (5) for heating and drying by a special sludge warehouse bottom discharger through a buried scraper conveyor (8) in a sealed way, and the heating steam is directly cooled into condensed water in the reverse-blade paddle type dryer (5) and is discharged through a conversion joint.
(2) Waste gas generated in the sludge drying process is discharged through a draught fan (7), and the micro-negative pressure operation of the reverse-blade paddle type dryer (5), auxiliary equipment and system pipelines is maintained.
(3) The extracted waste gas (gas such as steam and air mixture, voc and the like) is pretreated by a cyclone dust collector (6) and then continuously enters a high-temperature comprehensive treatment tower (9) for spraying and washing, most of steam in tail gas is sent into a heat recoverer for recycling after being washed, only a small amount of steam is condensed into water to form discharged wastewater, so that the discharge amount of the wastewater is controlled within 2t/h, the comprehensive treatment tower (9) is provided with a settling tank, a dosing system and the like, and harmful substances such as hydrogen sulfide and the like in the steam are neutralized and removed in a mode of adding medicaments and the like; the generation of odor is avoided; tail gas evaporated from the reverse blade paddle type dryer (5) is subjected to dust removal and odor removal by a comprehensive treatment tower (9), is cooled by a deep heat recoverer (13), is subjected to harmful substance removal, and is directly subjected to deodorization and then discharged or is sent to a boiler to be used as secondary air.
(4) The spraying liquid utilized by the comprehensive treatment tower (9) enters a circulating water tank (10), on one hand, the sprayed water is subjected to precipitation treatment, on the other hand, the spraying water is recycled, the generation amount of the waste water is reduced, and the precipitate in the waste water is hermetically conveyed to a wet sludge bin through a scraper conveyor (8).
(5) The gas treated by spraying enters a front heat exchanger (12) for primary waste heat utilization, the temperature of the treated gas (water vapor) is above 80 ℃ through an induced draft fan (7), one part of the treated gas enters a deep heat recoverer (13), and the other part of the treated gas returns to a steam pipeline and is used as a drying steam supplementary heat source.
(6) After being treated by the comprehensive tower, the tail gas continuously enters a deep heat recoverer (13) for waste heat utilization, and the mixed water of the steam condensate water and the desalted water conveyed from the inside of the reverse-blade paddle type dryer (5) is heated and then sent to a thermodynamic system of a power plant for continuous cyclic utilization.
(7) And in the deep heat recovery process, water vapor in the tail gas is condensed into water, the condensed water is rinsed and deoiled and then is sent into a cooling tower to be used as water supplement, and air is sent into a boiler to be incinerated.
(8) The dried sludge is conveyed to a dry sludge storage area (3) through a pipe chain type annular conveyor special for dry sludge, the dried sludge is mixed with coal in proportion and then is used as fuel for incineration treatment, and steam generated in the incineration process is recycled and continuously used as a heat source for sludge drying, so that cyclic utilization is realized.
CN201810754477.7A 2018-07-11 2018-07-11 Steam heat source sludge drying system and sludge drying method thereof Pending CN110776238A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111792816A (en) * 2020-05-28 2020-10-20 华能国际电力股份有限公司 Desulfurizing tower water-saving device and method for recovering sludge drying condensation water
CN113024056A (en) * 2021-03-16 2021-06-25 山东驰盛新能源设备有限公司 Rotational flow heat vibration drying machine and rotational flow heat vibration drying system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111792816A (en) * 2020-05-28 2020-10-20 华能国际电力股份有限公司 Desulfurizing tower water-saving device and method for recovering sludge drying condensation water
CN113024056A (en) * 2021-03-16 2021-06-25 山东驰盛新能源设备有限公司 Rotational flow heat vibration drying machine and rotational flow heat vibration drying system

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Application publication date: 20200211