CN114992645A - Sludge disposal system with deep drying and incineration coupled - Google Patents
Sludge disposal system with deep drying and incineration coupled Download PDFInfo
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- CN114992645A CN114992645A CN202210687545.9A CN202210687545A CN114992645A CN 114992645 A CN114992645 A CN 114992645A CN 202210687545 A CN202210687545 A CN 202210687545A CN 114992645 A CN114992645 A CN 114992645A
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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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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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
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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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The deep drying and incineration coupled sludge treatment system provided by the scheme is characterized in that a high-pressure plate-and-frame filter press deeply dehydrates sludge and then sends the sludge to a rotary dryer for desiccation, dry sludge enters a sludge storage bin and is sent to a fluidized bed incinerator for combustion after being mixed with wet sludge by a sludge conveying and feeding device, high-temperature flue gas generated by combustion recovers part of heat through a flue gas air preheater and an evaporator, the flue gas enters the rotary dryer to directly exchange heat with the deeply dehydrated sludge and is deeply dried, and the dry sludge and the wet sludge are mixed by the sludge conveying and feeding device and then are sent to the incinerator for combustion to form circulation. The boiler tail flue gas and the sludge are adopted for direct heat exchange, the heat transfer efficiency and the drying efficiency are high, and the treatment effect is good. The tail flue gas is fully combusted, the oxygen content in the flue gas is low, the temperature of the flue gas is low, and the operation safety of the rotary dryer is improved. The drying equipment is simple and easy to operate, and special water vapor condensation equipment is not required, so that the energy consumption of a sludge disposal system and the equipment investment cost can be reduced.
Description
Technical Field
The invention belongs to the technical field of incineration treatment, and particularly relates to a sludge disposal system with deep drying and incineration coupled.
Background
Sludge incineration is a mainstream treatment process for sludge treatment at present, and can realize harmless treatment, reduction and recycling of sludge.
The conventional sludge treatment process comprises sludge dewatering, sludge drying, fluidized bed incineration, waste heat utilization and flue gas treatment. The method comprises the steps of dewatering the sludge by a conventional machine to reach 80% of water content, then drying the sludge in a drying system, generally drying part of the sludge to reach about 30-40% by adopting a paddle or disc drying mode, mixing the sludge with the water content of 80%, and finally obtaining the sludge with the water content of about 60% in a furnace. The paddle and the disc drier are both dried by adopting saturated steam, the drying equipment is easy to wear, the drying process is a process of net energy expenditure, the proportion of energy consumption expense in the system operation cost is more than 80%, the overall investment and energy consumption cost of the system is high, and the operation condition is unstable.
The existing drying system is too complex, the heat transfer medium is steam, more equipment is needed, a special water vapor condensing device and the like are needed, and the equipment investment cost is high; in addition, the paddle dryer and the disc dryer both have the abrasion problem, the loss is large in the heat transfer process, the steam and the wet sludge are subjected to indirect heat exchange, and the heat exchange efficiency is low.
Therefore, how to simplify the system, improve the stability of the equipment operation, and reduce the energy consumption of the sludge disposal system is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a sludge disposal system with deep drying and incineration coupled, which can effectively simplify the system, improve the running stability of equipment and reduce the energy consumption of the sludge disposal system.
In order to solve the technical problem, the invention provides a sludge disposal system with deep drying and incineration coupled, which comprises a fluidized bed incinerator, a flue gas air preheater, an evaporator, an electric regulating valve, a rotary dryer, a high-pressure plate-and-frame filter press, a dry sludge storage bin and a sludge conveying and feeding device, wherein the fluidized bed incinerator is provided with a gas inlet and a gas outlet;
the high-pressure plate-and-frame filter press is used for deeply dewatering sludge;
the feed inlet of the rotary dryer is communicated with the outlet of the high-pressure plate-and-frame filter press, the discharge outlet of the rotary dryer is communicated with the sludge feed inlet of the dry sludge storage bin, the sludge discharge outlet of the dry sludge storage bin is communicated with the feed inlet of the sludge conveying and feeding device, the feed inlet of the sludge conveying and feeding device is also used for introducing wet sludge dehydrated by conventional machinery, the discharge outlet of the sludge conveying and feeding device is communicated with the sludge inlet of the fluidized bed incinerator, the flue gas outlet of the fluidized bed incinerator is communicated with the flue gas inlet of the flue gas air preheater, the air inlet of the flue gas air preheater is used for introducing external air, the air outlet of the flue gas air preheater is communicated with the air distribution pipe of the fluidized bed incinerator, and the flue gas outlet of the flue gas air preheater is communicated with the flue gas inlet of the evaporator, the smoke outlet of the evaporator is communicated with the air inlet of the rotary dryer;
the electric regulating valve is connected in series on a flue gas pipeline between the fluidized bed incinerator and the rotary dryer.
Optionally, in the above deep drying and incineration coupled sludge treatment system, the electric control valve is disposed between a flue gas outlet of the evaporator and an air inlet of the rotary dryer.
Optionally, in the sludge disposal system with deep drying and incineration coupled, a cyclone separator is further included, an air outlet of the rotary dryer is communicated with an inlet of the cyclone separator, a smoke outlet of the cyclone separator is communicated with a smoke inlet of the dry sludge storage bin, and a smoke outlet of the cyclone separator is used for discharging smoke.
Optionally, in the sludge treatment system with deep drying and incineration coupled, a flue gas purification system is further included, and a flue gas outlet of the cyclone separator is communicated with the flue gas purification system.
Optionally, in the sludge treatment system with deep drying and incineration coupled, a fan is arranged between the flue gas outlet of the cyclone separator and the flue gas purification system.
Optionally, in the sludge treatment system with deep drying and incineration coupled, a flue gas outlet of the evaporator is provided with a three-way valve, wherein one way is communicated with a gas inlet of the rotary dryer, and the other way is communicated with a flue gas inlet of the economizer.
Optionally, in the sludge treatment system with deep drying and incineration coupled, a cylinder of the rotary dryer is provided with a lifting plate, and an axis of the cylinder is provided with a stirring device.
Optionally, in the sludge treatment system with deep drying and incineration coupled, a feed inlet of the rotary dryer is higher than a discharge outlet, and the cylinder is arranged in an inclined manner.
Optionally, in the sludge treatment system with deep drying and incineration coupled, the fan is configured to control a cylinder of the rotary dryer to be in a micro negative pressure state.
Optionally, in the sludge disposal system with deep drying and incineration coupled, the high-pressure plate-and-frame filter press is used for deeply dewatering sludge to a water content of 60 ± 5%, the rotary dryer is used for drying sludge to a water content of 30% ± 5%, and a wet sludge inlet of the fluidized bed incinerator is used for introducing wet sludge with a water content of 80 ± 5% after conventional mechanical dewatering.
The deep drying and incineration coupled sludge disposal system provided by the invention has the following beneficial effects:
the boiler tail smoke and the sludge are adopted for direct heat exchange, and the method has the characteristics of high heat transfer efficiency and drying efficiency, good treatment effect and the like; the tail flue gas is fully combusted, the oxygen content in the flue gas is low, the temperature of the flue gas is low, and the operation safety of the rotary dryer is improved. The tail waste heat is effectively utilized, the heat value of the sludge entering the furnace is improved, the stable operation of the fluidized bed incinerator is ensured, the using amount of auxiliary fuel is reduced, and the operation economy is improved; the drying equipment is simple and easy to operate, and special water vapor condensation equipment is not required, so that the energy consumption of a sludge treatment system and the equipment investment cost can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sludge disposal system with deep drying and incineration coupled according to an embodiment of the present invention.
In the upper drawing:
1-fluidized bed incinerator;
2-flue gas air preheater; 201-air inlet; 202-air outlet;
3-an evaporator;
4-electric regulating valve;
5-a rotary dryer; 501-a feed inlet; 502-air inlet; 503-discharge hole; 504-air outlet;
6-a cyclone separator;
7-dry sludge storage;
8-sludge conveying and feeding device;
9-a coal economizer;
10-a flue gas purification system;
11-a fan.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings only for the convenience of description of the present invention and simplification of the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is more than two, if there are first and second described for the purpose of distinguishing technical features, but not for indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The core of the invention is to provide a sludge disposal system with deep drying and incineration coupled, which can effectively simplify the system, improve the stability of equipment operation and reduce the energy consumption of the sludge disposal system.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Specific concepts of terminology referred to below include:
sludge drying: the process of removing most of water in the sludge through the functions of percolation or evaporation and the like.
Sludge incineration: a process for treating sludge includes such steps as heating and drying the dewatered sludge in incinerator, and oxidizing the organic substances in sludge at high temp to obtain less ash.
Sludge water content: the percentage of the weight of water contained in the sludge to the total weight of the sludge.
Fluidized bed incinerator: a main device for incinerating sludge or other fuels is characterized in that quartz sand with a certain thickness and a certain particle size range is paved in a furnace, air with a certain pressure is blown in through a bottom air distribution device, the sand and the fuels are blown up, overturned and floated, the furnace is in a suspension fluidization state, and drying, ignition and combustion of the fuels are realized.
Flue gas air preheater: the tail flue gas heat is used for heating air required by fuel combustion.
An evaporator: the tail flue gas heat is utilized to change water into saturated steam.
A coal economizer: the boiler water supply equipment is heated by utilizing the heat of tail flue gas.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a sludge disposal system with deep drying and incineration coupled according to an embodiment of the present invention.
The invention provides a sludge disposal system with deep drying and incineration coupled, which comprises a fluidized bed incinerator 1, a flue gas air preheater 2, an evaporator 3, an electric regulating valve 4, a rotary dryer 5, a high-pressure plate-and-frame filter press, a dry sludge storage bin 7 and a sludge conveying and feeding device 8.
Wherein, the high-pressure plate-and-frame filter press is used for deeply dehydrating the sludge. The sludge dewatering process mainly adopts mechanical dewatering, the conventional mechanical pressure sludge dewatering machine can only dewater sludge to about 80 percent of water content, and the high-pressure plate-and-frame filter press can deeply dewater sludge to about 60 +/-5 percent.
It should be noted that the sludge from the high-pressure plate-and-frame filter press directly enters the feed inlet 501 of the rotary dryer 5. The high-pressure plate-and-frame filter press can dry wet sludge with the water content of about 80% to the water content of about 60%, and the method is more energy-saving than the traditional paddle drying method, but the sludge from the high-pressure plate-and-frame filter press cannot be self-sustained and combusted, so that the self-sustained combustion can be realized only by adopting a rotary dryer 5 for further drying.
The inlet 501 of the rotary dryer 5 is communicated with the outlet of the high-pressure plate-and-frame filter press, the outlet 503 of the rotary dryer 5 is communicated with the sludge inlet of the dry sludge storage bin 7, the sludge outlet of the dry sludge storage bin 7 is communicated with the inlet of the sludge conveying and feeding device 8, the inlet of the sludge conveying and feeding device 8 is also used for introducing wet sludge dehydrated by conventional machinery, the outlet of the sludge conveying and feeding device 8 is communicated with the sludge inlet of the fluidized bed incinerator 1, the flue gas outlet of the fluidized bed incinerator 1 is communicated with the flue gas inlet of the flue gas air preheater 2, the air inlet 201 of the flue gas air preheater 2 is used for introducing external air, the air outlet 202 of the flue gas air preheater 2 is communicated with the air distribution pipe of the fluidized bed incinerator 1, the flue gas outlet of the flue gas air preheater 2 is communicated with the flue gas inlet of the evaporator 3, and the flue gas outlet of the evaporator 3 is communicated with the air inlet 502 of the rotary dryer 5. Specifically, the flue gas direction in the rotary dryer 5 can be a counter-flow type or a concurrent type relative to the sludge, and can be adaptively selected according to actual conditions. Cold air is introduced into an air inlet 201 of the flue gas air preheater 2, exchanges heat with the flue gas in the pipeline, and enters an air distribution pipe at the lower part of the incinerator through an air outlet 202 of the flue gas air preheater 2 after being heated to the temperature required by fluidized air of the incinerator, and is distributed by the air distribution pipe to enter a hearth.
It should be noted that the wet sludge introduced into the feed inlet of the sludge conveying and feeding device 8 is sludge with a water content of about 80% after being dehydrated by a conventional machine, and the dry sludge and the wet sludge are mixed or respectively fed into the fluidized bed incinerator 1, and the main purpose of the wet sludge is to adjust the combustion temperature in the fluidized bed incinerator 1, not only to ensure stable combustion, but also to ensure no over-temperature, and the main purpose of the wet sludge is to adjust and control the furnace temperature to avoid over-temperature coking.
The electric regulating valve 4 is connected in series on a flue gas pipeline between the fluidized bed incinerator 1 and the rotary dryer 5. The electric regulating valve 4 is used for regulating the amount of flue gas entering the rotary dryer 5, thereby controlling the sludge drying degree.
The working principle is as follows: the high-pressure plate-and-frame filter press deeply dehydrates sludge and then sends the dehydrated sludge to the rotary dryer 5 for desiccation, dry sludge enters a sludge storage bin, the sludge is sent to the fluidized bed incinerator 1 for combustion through the sludge conveying and feeding device 8, after part of heat is recovered by high-temperature flue gas generated by combustion through the flue gas air preheater 2 and the evaporator 3, part of the flue gas enters the rotary dryer 5 for direct heat exchange with the deeply dehydrated sludge of the high-pressure plate-and-frame filter press, the sludge is deeply desiccated, the dry sludge and wet sludge are mixed through the sludge conveying and feeding device 8 and then sent to the fluidized bed incinerator 1 for combustion, and after part of high-temperature flue gas waste heat generated by combustion is recovered, the sludge is continuously dehydrated, so that circulation is formed.
According to the sludge treatment system with the deep drying and incineration coupled, the flue gas at the tail of the boiler is directly subjected to heat exchange with the sludge, and the sludge treatment system has the characteristics of high heat transfer efficiency and drying efficiency, good treatment effect and the like; the tail flue gas is fully combusted, the oxygen content in the flue gas is low, the temperature of the flue gas is low, and the operation safety of the rotary dryer 5 is improved. The tail waste heat is effectively utilized, the heat value of the sludge entering the furnace is improved, the stable operation of the fluidized bed incinerator 1 is ensured, the consumption of auxiliary fuel is reduced, and the operation economy is improved; the drying equipment is simple and easy to operate, and special water vapor condensation equipment is not required, so that the energy consumption of a sludge disposal system and the equipment investment cost can be reduced.
In the specific embodiment, the electric control valve 4 is disposed between the flue gas outlet of the evaporator 3 and the air inlet 502 of the rotary dryer 5.
The device also comprises a cyclone separator 6 for separating the smoke dust carried in the smoke. An air outlet 504 of the rotary dryer 5 is communicated with an inlet of the cyclone separator 6, a smoke outlet of the cyclone separator 6 is communicated with a smoke inlet of the dry sludge storage bin 7, and a smoke outlet of the cyclone separator 6 is used for discharging smoke.
On the basis of the above specific embodiment, the present application further includes a flue gas purification system 10, and the flue gas outlet of the cyclone separator 6 is communicated with the flue gas purification system 10.
In order to improve the gas circulation effect, a fan 11 is arranged between the flue gas outlet of the cyclone separator 6 and the flue gas purification system 10.
In addition, the system comprises a coal economizer 9 except that the flue gas air preheater 2 and the evaporator 3 are used as waste heat recovery devices, a flue gas outlet of the evaporator 3 is provided with a three-way valve, one path of the flue gas outlet is communicated with an air inlet 502 of the rotary dryer 5, the other path of the flue gas outlet is communicated with a flue gas inlet of the coal economizer 9, and the flue gas can enter the flue gas purification system 10 after heat exchange through the coal economizer 9. Specifically, the flue gas discharged from the rotary dryer 5 is separated from dust carried in the flue gas by the cyclone separator 6, and then mixed with the flue gas at the outlet of the economizer 9 to enter the flue gas purification system 10.
The cylinder of the rotary dryer 5 is provided with a lifting plate, and the axis of the cylinder is provided with a stirring device. The equipment is simple and reliable to operate, good in dustproof sealing performance and convenient to maintain.
The feed inlet 501 of the rotary dryer 5 is higher than the discharge outlet 503, and the barrel is arranged obliquely.
Specifically, the flue gas enters the flue gas purification system 10 from the gas outlet 504 of the rotary dryer 5 for subsequent flue gas treatment, and the rotary dryer 5 is maintained in a micro-negative pressure state by adjusting the frequency of the rear fan 11 of the rotary dryer 5 and the size of the air door, so that the problems of odor and environmental protection reaching standards can be effectively solved.
From the view of process parameters, the high-pressure plate-and-frame filter press adopted by the invention is used for deeply dehydrating the sludge to the water content of 60 +/-5%, compared with the prior art, the paddle drier dries the sludge to about 30-40%, the water content of the sludge in the scheme is reduced to about 60% from about 80% after conventional mechanical dehydration, and the energy consumption is obviously reduced through high-pressure dehydration. Meanwhile, the rotary dryer 5 has low requirements on the water content/viscosity of the sludge and can be directly fed. The rotary dryer 5 is used for drying the sludge until the water content is 30 +/-5%, and the internal sludge is directly contacted with the flue gas for drying. The wet sludge inlet of the fluidized bed incinerator 1 is used for introducing wet sludge with the water content of 80 +/-5% after conventional mechanical dehydration.
By adopting the devices, the problem that the low-heat-value sludge cannot be stably combusted can be effectively solved, the sludge is deeply dried by effectively utilizing the waste heat of the tail flue gas, and the self-sustaining combustion of the sludge is realized.
In one embodiment, the sludge can be deeply dewatered to about 60 +/-5% by using a high-pressure plate-and-frame filter press. Sludge after the degree of depth dehydration is delivered to and is dried in rotary dryer 5, can be with sludge drying to moisture content 30% +/-5% about, dry sludge gets into sludge storage storehouse, carry and feed device 8 by sludge and send into fluidized bed incinerator 1 and burn, the high temperature flue gas that the burning produced gets into flue gas air preheater 2, heat the cold air to the required temperature of incinerator fluidization wind, the lower part cloth tuber pipe that gets into incinerator after, get into furnace by the distribution of cloth tuber pipe distribution. The high-temperature flue gas after heat exchange by the flue gas air preheater 2 enters the evaporator 3 again, and water in the steam generator is heated to saturated steam which can be used for supplying heat to the outside. About 350 +/-20% of flue gas from the evaporator 3 passes through a three-way valve, and one way of flue gas enters the economizer 9 for heat exchange to heat boiler feed water; the other path is sent to a rotary dryer 5 through an electric regulating valve 4. The rotary dryer 5 can be roughly divided into a feed inlet 501, an air inlet 502, a discharge outlet 503 and an air outlet 504, in order to facilitate the discharge of sludge, the feed inlet 501 is higher than the discharge outlet 503, and the cylinder is generally provided with an inclination angle of 3-5 degrees. Set up the lift plate on rotary dryer 5 barrel, barrel axle center department sets up agitating unit, can effectively prevent mud caking in rotary dryer 5. The flue gas enters the rotary dryer 5 from the air inlet to directly exchange heat with the sludge, and the heat energy is transferred to the wet sludge surface in direct contact with the flue gas in a convection mode through the hot flue gas and then transferred to the inside through the sludge surface, so that the sludge is dried, the moisture of the sludge is taken away, and the sludge is discharged from the air outlet. The electric regulating valve 4 can regulate the amount of flue gas entering the rotary dryer 5, thereby controlling the sludge drying degree. The flue gas direction can be a counter-current type or a concurrent type relative to the sludge. The dried sludge dried by the rotary dryer 5 is sent into a sludge storage bin, the exhausted flue gas (150-200 ℃) is subjected to dust separation by a cyclone separator 6 and then sent into the sludge storage bin, then the flue gas enters a flue gas purification system 10 through a fan 11 for final treatment, and the treated flue gas is discharged through a chimney. The rotary dryer 5 is maintained in a micro-negative pressure state by adjusting the frequency of the fan 11 and the size of the damper, thereby preventing leakage of odor.
In conclusion, the invention has the following beneficial effects:
1) the water content of the sludge entering the furnace is reduced, the heat value of the sludge is improved, and the self-sustaining combustion of the sludge is realized.
2) The heat source of the rotary dryer adopts the tail flue gas of a waste heat boiler, the tail flue gas enters the rotary dryer for direct heat exchange, and the energy consumption of the method is lower than that of a steam type or other indirect heaters.
3) The rotary dryer has the advantages of simple operation and control, high treatment capacity, strong applicability and high heat exchange efficiency.
4) In order to avoid the caking of the sludge in the rotary dryer, a lifting plate and a stirring device are arranged in the rotary dryer.
5) The flue gas volume entering the rotary dryer can be adjusted through the electric adjusting valve, so that the sludge drying degree is controlled.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A sludge disposal system with deep drying and incineration coupled is characterized by comprising a fluidized bed incinerator, a flue gas air preheater, an evaporator, an electric regulating valve, a rotary dryer, a high-pressure plate-and-frame filter press, a dry sludge storage bin and a sludge conveying and feeding device;
the high-pressure plate-and-frame filter press is used for deeply dewatering sludge;
the feed inlet of the rotary dryer is communicated with the outlet of the high-pressure plate-and-frame filter press, the discharge outlet of the rotary dryer is communicated with the sludge feed inlet of the dry sludge storage bin, the sludge discharge outlet of the dry sludge storage bin is communicated with the feed inlet of the sludge conveying and feeding device, the feed inlet of the sludge conveying and feeding device is also used for introducing wet sludge dehydrated by conventional machinery, the discharge outlet of the sludge conveying and feeding device is communicated with the sludge inlet of the fluidized bed incinerator, the flue gas outlet of the fluidized bed incinerator is communicated with the flue gas inlet of the flue gas air preheater, the air inlet of the flue gas air preheater is used for introducing external air, the air outlet of the flue gas air preheater is communicated with the air distribution pipe of the fluidized bed incinerator, and the flue gas outlet of the flue gas air preheater is communicated with the flue gas inlet of the evaporator, the smoke outlet of the evaporator is communicated with the air inlet of the rotary dryer;
the electric regulating valve is connected in series on a flue gas pipeline between the fluidized bed incinerator and the rotary dryer.
2. The deep drying and incineration coupled sludge handling system of claim 1, wherein the electrically adjustable valve is disposed between a flue gas outlet of the evaporator and an air inlet of the rotary dryer.
3. The deep drying and incineration coupled sludge treatment system according to claim 1, further comprising a cyclone separator, wherein an air outlet of the rotary dryer is communicated with an inlet of the cyclone separator, a smoke outlet of the cyclone separator is communicated with a smoke inlet of the dry sludge storage bin, and a smoke outlet of the cyclone separator is used for discharging smoke.
4. The deep drying and incineration coupled sludge handling system of claim 3, further comprising a flue gas purification system, wherein the flue gas outlet of the cyclone is in communication with the flue gas purification system.
5. The deep drying and incineration coupled sludge disposal system according to claim 4, wherein a fan is disposed between the flue gas outlet of the cyclone separator and the flue gas purification system.
6. The deep drying and incineration coupled sludge treatment system according to claim 1, wherein a flue gas outlet of the evaporator is provided with a three-way valve, one path of the three-way valve is communicated with a gas inlet of the rotary dryer, and the other path of the three-way valve is communicated with a flue gas inlet of an economizer.
7. The deep drying and incineration coupled sludge disposal system according to claim 1, wherein a lifting plate is disposed on a cylinder of the rotary dryer, and a stirring device is disposed at an axial center of the cylinder.
8. The deep drying and incineration coupled sludge disposal system according to claim 7, wherein a feed inlet of the rotary dryer is higher than a discharge outlet, and the cylinder is disposed in an inclined manner.
9. The deep drying and incineration coupled sludge disposal system according to claim 1, wherein the fan is configured to control a barrel of the rotary dryer to be in a micro-negative pressure state.
10. The deep drying and incineration coupled sludge disposal system according to any one of claims 1 to 9, wherein the high-pressure plate-and-frame filter press is used for deep dewatering of sludge to a water content of 60 ± 5%, the rotary dryer is used for drying sludge to a water content of 30% ± 5%, and the wet sludge inlet of the fluidized bed incinerator is used for introducing wet sludge with a water content of 80 ± 5% after conventional mechanical dewatering.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115784556A (en) * | 2022-12-28 | 2023-03-14 | 广东广业投资集团有限公司 | Sludge drying method, sludge drying system and tunnel kiln production system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115784556A (en) * | 2022-12-28 | 2023-03-14 | 广东广业投资集团有限公司 | Sludge drying method, sludge drying system and tunnel kiln production system |
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