CN111473341A - Mechanical rotary sludge incineration system and working method - Google Patents
Mechanical rotary sludge incineration system and working method Download PDFInfo
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- CN111473341A CN111473341A CN202010441735.3A CN202010441735A CN111473341A CN 111473341 A CN111473341 A CN 111473341A CN 202010441735 A CN202010441735 A CN 202010441735A CN 111473341 A CN111473341 A CN 111473341A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- 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
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- 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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
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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
- F23G5/44—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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/10—Drying by heat
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/12—Sludge, slurries or mixtures of liquids
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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
- F23J2217/00—Intercepting solids
- F23J2217/40—Intercepting solids by cyclones
Abstract
The invention belongs to the technical field of sludge treatment, and particularly relates to a mechanical rotary sludge incineration system and a working method thereof. The system comprises: a drier, an incinerator and a heat exchange device; the drier is suitable for drying wet sludge; the incinerator is suitable for incinerating dried sludge; the heat exchange device is suitable for respectively exchanging heat of the incineration flue gas with water, the dried tail gas and air. The working method comprises the following steps: sending the wet sludge to a drier for drying, and burning the dried sludge in an incinerator; sending the incineration flue gas into a heat exchange device to be respectively subjected to heat exchange with water, the dried tail gas and air, sending the steam to a drying machine, and sending the dried tail gas and the air after temperature rise to an incinerator. The mechanical rotary sludge incineration system and the working method thereof couple the sludge drying and incineration processes, the heat generated by sludge incineration is sent to the heat exchange device for waste heat utilization, and the steam is used for sludge drying, so that the heat exchange link is greatly simplified, the heat exchange efficiency is improved, the operation cost is reduced, and the mechanical rotary sludge incineration system is suitable for treatment of municipal sewage sludge and industrial sludge.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a mechanical rotary sludge incineration system and a working method thereof.
Background
Sludge treatment is an important component of urban sewage treatment systems. The sludge treatment and disposal shall follow the principle of source reduction and whole-process control, the source control of toxic and harmful substances is enhanced, the whole-process management of the sludge treatment and disposal is implemented, and the comprehensive standard reaching of water, gas and slag must be achieved simultaneously when the sewage plant is constructed according to the national technical policy of sludge treatment and disposal and pollution prevention of urban sewage treatment plants. Ten items of water issued by the nation in 2015 and special action schemes of two reduction, six treatment and three promotion issued by national government of Jiangsu province in 2016 require that the sludge treatment standard-reaching transformation of the existing urban sewage treatment plant is completed comprehensively, the regional market is built to cover the sludge treatment facility of the urban sewage treatment plant, and the harmless treatment rate reaches 100%.
In the existing sludge disposal system, sludge is dried and then put into an incinerator for incineration, and generated flue gas is directly purified by a flue gas treatment device and then discharged; a large amount of heat energy contained in the flue gas is not fully utilized, so that resource waste is caused, and the treatment cost of the flue gas treatment device is increased.
Disclosure of Invention
The invention aims to provide a mechanical rotary sludge incineration system and a working method thereof, and aims to solve the technical problem of low resource utilization rate of the sludge incineration system.
In order to solve the above technical problems, the present invention provides a mechanical rotary sludge incineration system, comprising:
a drier, an incinerator and a heat exchange device; wherein
The drying machine is suitable for drying wet sludge and conveying dried tail gas to the heat exchange device;
the incinerator is suitable for incinerating dried sludge;
the heat exchange device is suitable for respectively carrying out heat exchange on incineration flue gas with water, drying tail gas and air, conveying the steam subjected to heat exchange to the drying machine, and conveying the drying tail gas subjected to heat exchange and temperature rise and the air to the incinerator.
Further, the heat exchange device comprises a waste heat boiler and a waste heat recovery heat exchanger, and the waste heat boiler and the waste heat recovery heat exchanger are communicated through a lower-layer flue;
a liquid conveying channel is arranged in the waste heat boiler in a penetrating mode, the waste heat boiler is suitable for carrying out primary heat exchange on water in the liquid conveying channel and incineration flue gas in the boiler, and steam generated in the liquid conveying channel is conveyed to the drying machine;
and a tail gas channel and an air channel are arranged in the waste heat recovery heat exchanger in a penetrating manner, the waste heat recovery heat exchanger is suitable for carrying out secondary heat exchange on the dried tail gas in the tail gas channel and the air in the air channel and the flue gas subjected to primary heat exchange respectively, and conveying the dried tail gas and the air subjected to heat exchange and temperature rise to the incinerator.
Furthermore, the drier is an indirect drier and is suitable for drying wet sludge through steam heat conduction, and blades of the indirect drier are suitable for cutting and stirring the wet sludge so as to continuously update the drying surface of the wet sludge.
Further, a flue gas outlet of the waste heat recovery heat exchanger is communicated with a flue gas treatment device, and the flue gas treatment device is suitable for purifying and discharging flue gas output by the waste heat recovery heat exchanger;
the flue gas treatment device comprises a CFB desulfurization tower, a bag type dust collector and a chimney; wherein
The CFB desulfurizing tower is suitable for removing acid gas in the flue gas after the second heat exchange;
the bag type dust collector is suitable for removing dust from deacidified incineration flue gas and conveying the incineration flue gas to a chimney for emission.
Further, a cyclone dust collector and a condenser are arranged between the drier and the waste heat recovery heat exchanger; wherein
The cyclone dust collector is suitable for removing dust from the dried tail gas and conveying the generated ash to the incinerator;
the condenser is suitable for condensing the tail gas after dust removal, and conveying the uncondensed tail gas to a tail gas channel in the waste heat recovery heat exchanger.
Further, the mechanical rotary type sludge incineration system also comprises a sludge bin and a drier feeding device; wherein
The sludge bin is internally provided with an arch breaking device which is suitable for breaking bridges for wet sludge stored in the sludge bin and conveying the wet sludge to a drier feeding device; and
the drier feeding device is suitable for conveying wet sludge to the drier.
Further, the mechanical rotary sludge incineration system also comprises a slag bin and an ash bin; wherein
The slag bin is suitable for storing slag discharged by the incinerator, the waste heat boiler and the waste heat recovery heat exchanger;
the ash bin is suitable for storing fly ash discharged by the CFB desulfurization tower and the bag type dust collector.
In another aspect, the present invention further provides a working method of a mechanical rotary sludge incineration system, including:
conveying the wet sludge to a drier for drying, and burning the dried sludge in an incinerator;
and (3) feeding the incineration flue gas into a heat exchange device to respectively exchange heat with water, the drying tail gas and air, conveying the steam after heat exchange to a drying machine, and conveying the drying tail gas and the air after heat exchange and temperature rise to an incinerator.
Further, the heat exchange device comprises a waste heat boiler and a waste heat recovery heat exchanger communicated with the waste heat boiler;
feeding the incineration flue gas into a waste heat boiler to perform primary heat exchange with water, and conveying the exchanged steam to a drier;
and (3) sending the flue gas subjected to the first heat exchange into a waste heat recovery heat exchanger to perform second heat exchange with the dried tail gas and the air respectively, and conveying the dried tail gas and the air subjected to the exchange and temperature rise to the incinerator.
And further, conveying the flue gas subjected to the second exchange to a CFB (circulating fluid bed) desulfurization tower to remove acid gas, conveying the flue gas subjected to deacidification to a bag type dust collector to remove dust, and conveying the flue gas subjected to dust removal to a chimney to be discharged.
The mechanical rotary sludge incineration system and the working method have the beneficial effects that the sludge drying and incineration process is coupled, the heat generated by sludge incineration is sent to the heat exchange device for waste heat utilization, the generated steam is used for sludge drying, the heat exchange link is greatly simplified, the heat exchange efficiency is improved, the operation cost is reduced, the mechanical rotary sludge incineration system and the working method are suitable for treatment and disposal of municipal sewage sludge or part of industrial sludge with the water content of 60-80%, the mechanical rotary sludge incineration system and the working method are suitable for treatment and disposal of sludge with a single source and sludge with various sources, the sludge reduction degree is reduced to the maximum extent, the sludge reduction degree reaches 90%, the final disposal is facilitated, and the problems that the sludge is buried to occupy land and causes secondary pollution are solved; wet air and odor carried by the indirectly dried tail gas are finally deodorized by burning, so that the problem of odor pollution is thoroughly solved; the CFB desulfurizing tower and the bag type dust collector effectively reduce the acid gas and dust content in the flue gas, realize the clean emission of the flue gas, and are superior to the national standard.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of a preferred embodiment of the mechanical rotary sludge incineration system of the present invention.
In the figure:
the system comprises a sludge bin 1, an arch breaking device 2, a drier feeding device 3, a drier 4, a dry sludge discharging machine 5, a dry sludge bin 6, a dry sludge conveyer 7, an incinerator 8, a waste heat boiler 9, a waste heat recovery heat exchanger 10, a CFB (circulating fluid bed) desulfurizing tower 11, a bag type dust collector 12, a No. 3 fan 13, a chimney 14, a cyclone dust collector 15, a condenser 16, a No. 1 fan 17, a liquid conveying channel 18, a tail gas channel 19, an air channel 20, a lower layer flue 21, an air blower 22, a slag bin 23, a back mixing device 24, an ash bin 25, an air heater 26, an ammonia water tank 27, an ammonia water pump 28, a No. 2 fan 29, a combustor 30 and a slag discharging machine 31.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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.
Example 1
As shown in fig. 1, the mechanical rotary sludge incineration system of the present embodiment includes a drying machine 4, an incinerator 8 and a heat exchange device; the drier 4 is suitable for drying wet sludge and conveying the dried tail gas to the heat exchange device, and the incinerator 8 is suitable for incinerating the dried sludge; the heat exchange device is suitable for respectively exchanging heat of incineration flue gas with water, drying tail gas and air, conveying the steam after heat exchange to the drier 4, and conveying the drying tail gas after heat exchange and temperature rise and the air to the incinerator 8. The system couples the sludge drying and incineration processes, the heat generated by sludge incineration is sent to the heat exchange device for waste heat utilization, the heat exchange link is greatly simplified, the heat exchange efficiency is improved, the operation cost is reduced, the sludge incineration fully utilizes the incinerated waste heat as a drying heat source, the use of clean energy is reduced, the generated steam is used for sludge drying, slag and fly ash are generated after sludge incineration, the transportation cost is greatly reduced, and the slag can also be used for road construction or building material utilization and the like; the sludge is stabilized, reduced and innoxious to the maximum extent by adopting an independent drying and incinerating means; the method is suitable for treating municipal sewage sludge or partial industrial sludge with the water content of 60-80%, is suitable for treating sludge from a single source and sludge from various sources, realizes sludge reduction to the maximum extent, achieves the sludge reduction degree of 90%, is convenient for final treatment, and solves the problems of land occupation and secondary pollution caused by sludge landfill.
As shown in fig. 1, the heat exchange device includes a waste heat boiler 9 and a waste heat recovery heat exchanger 10, and the waste heat boiler 9 and the waste heat recovery heat exchanger 10 are communicated through a lower flue 21; a liquid conveying channel 18 is arranged in the waste heat boiler 9 in a penetrating way, and in the embodiment, soft water is adopted as water entering the liquid conveying channel 18; the waste heat boiler 9 is suitable for carrying out primary heat exchange on the soft water in the liquid conveying channel 18 and the incineration flue gas in the boiler, the temperature of the flue gas is reduced to about 150 ℃, and steam generated in the liquid conveying channel 18 is conveyed to the drier 4; a tail gas channel 19 and an air channel 20 are arranged in the waste heat recovery heat exchanger 10 in a penetrating manner, the waste heat recovery heat exchanger 10 is suitable for respectively carrying out secondary heat exchange on the dried tail gas in the tail gas channel 19 and the air in the air channel 20 and the flue gas after primary heat exchange, and conveying the dried tail gas and the air after heat exchange and temperature rise to the incinerator 8; the preferred matching mode of the heat exchange device in the embodiment adopts a set of waste heat boiler 9 and a set of waste heat recovery heat exchanger 10; the waste heat boiler 9 utilizes the waste heat of the flue gas to produce steam for drying sludge, thereby realizing economic operation; the waste heat recovery heat exchanger 10 increases the temperature of the dried tail gas to be used as primary air of the incinerator 8, so that the heat efficiency of the whole system is improved, and resources are reasonably utilized.
As shown in the figure 1, the mechanical rotary sludge incineration system further comprises a sludge bin 1 and a dryer feeding device 3, wherein an arch breaking device 2 is arranged in the sludge bin 1 and is suitable for breaking and bridging wet sludge stored in the sludge bin 1 and conveying the wet sludge to the dryer feeding device 3, the dryer feeding device 3 is suitable for conveying the wet sludge to a dryer 4, the wet sludge (with a general water content of 80%) is conveyed to the sludge bin 1 in a vehicle-mounted transportation mode, the arch breaking device 2 is matched with the sludge bin 1 and is used for preventing sludge from being accumulated and bridged, the arch breaking device 2 can adopt a slide frame type or a plurality of groups of spiral structures, the sludge is conveyed to the dryer feeding device 3 through the arch breaking device 2, the dryer feeding device 3 is preferably in a spiral form and conveys the wet sludge to the dryer 4, the dryer 4 is an indirect dryer and is suitable for indirectly contacting with heat transfer of steam heat transfer, the wet sludge through steam heat transfer, and drying, and the blade of the indirect dryer is suitable for cutting and stirring the wet sludge incinerator to update the drying surface of the wet sludge, the drying surface, the sludge can be quickly reduced to 20% below 20%, the sludge is more quickly, the sludge is suitable for drying incinerator, the sludge is more quickly reduced by replacing the drying surface of the sludge drying system, the sludge incinerator by a drying system, the sludge drying system, the drying incinerator, the drying system, the drying incinerator is more preferably, the drying system is more preferably, the drying system is more preferably, the drying system is more preferably, the drying system is more preferably, the drying system is more preferably, the drying system is more preferably, the drying system is more preferably, the drying system is more preferably, the.
As shown in fig. 1, a cyclone dust collector 15 and a condenser 16 are arranged between the drying machine 4 and the waste heat recovery heat exchanger 10; wherein the cyclone dust collector 15 is adapted to remove dust from the dried tail gas and to convey the generated ash to the incinerator 8; the condenser 16 is adapted to condense the dedusted tail gas and convey the uncondensed tail gas to a tail gas channel 19 in the waste heat recovery heat exchanger 10 for heat exchange. A part of steam generated by the waste heat boiler 9 is subjected to indirect heat exchange with air through an air heater 26, the heated air enters the drier 4, drying tail gas is brought into the cyclone dust collector 15 for dust removal, and ash enters the dry sludge discharging machine 5 to be mixed with dry sludge discharged by the drier 4; the dried tail gas is condensed by a condenser 16, industrial water is preferably used as a cooling water source of the condenser 16, condensed water enters a wastewater treatment system for disposal, uncondensed tail gas is sent into a tail gas channel 19 of the waste heat recovery heat exchanger 10 through a No. 1 fan 17 to perform secondary heat exchange with the flue gas after the primary heat exchange of the waste heat recovery heat exchanger 10, and the heated dried tail gas enters the incinerator 8 again to realize flue gas deodorization; because the drier 4 is a low-speed stirring type indirect drier with conduction heating, a jacket is arranged on a drier cylinder, a hollow blade is arranged on a hollow shaft, the other part of steam generated by the waste heat boiler 9 enters a shell and a stirring shaft of the drier 4 and indirectly contacts with sludge to heat the sludge, and the sludge is stirred by the hollow blade to fully exchange heat with the cylinder and the hot surface of the blade so as to achieve the purpose of drying the sludge. The indirect dryer is a conduction type drying machine with more applications, is used for sludge drying treatment, and has the advantages of large heat exchange area, low investment, simple process, low net heat consumption and the like; the indirect dryer has the advantages of compact structure, large heat transfer area, small occupied area, small air consumption during drying, less dust, self-cleaning function due to interaction of the blades, long sludge retention time and high filling coefficient.
As shown in fig. 1, a flue gas outlet of the waste heat recovery heat exchanger 10 is communicated with a flue gas treatment device, and is adapted to purify and discharge flue gas output by the waste heat recovery heat exchanger 10; specifically, the flue gas treatment device comprises a CFB desulfurization tower 11, a bag type dust collector 12 and a chimney 14, wherein the CFB desulfurization tower 11 is suitable for removing acid gas in flue gas after the second heat exchange, the bag type dust collector 12 is suitable for removing dust from deacidified incineration flue gas, and the flue gas treated by the bag type dust collector 12 is sent to the chimney 14 through a # 3 fan 13 for emission. An activated carbon feeding system is arranged on a flue gas pipeline between the waste heat recovery heat exchanger 10 and the CFB desulfurizing tower 11, so that pollutants in the flue gas are effectively removed; the CFB desulfurizing tower 11 is provided with a slaked lime feeding system which is suitable for inputting slaked lime and water into the CFB desulfurizing tower 11, so that the emission of acid gas is effectively reduced; the flue gas desulfurized by the CFB desulfurizing tower 11 enters a bag type dust collector 12 for dust removal treatment, and fly ash generated by the bag type dust collector 12 and the CFB desulfurizing tower 11 finally enters an ash bin 25 for storage or disposal; the bag type dust collector 12 returns the ash to the CFB desulfurization tower 11 through the back mixing device 24, so that the utilization rate of the slaked lime is improved, and unnecessary waste is avoided; the flue gas enters a circulating fluidized bed body after being accelerated by a Venturi tube at the bottom of a CFB (circulating fluid bed) desulfurizing tower 11, the gas-solid phase is in violent turbulence and mixing with solid matters such as slaked lime, activated carbon and the like under the action of airflow, and is fully contacted, floccule is continuously formed and returns downwards in the rising process, and the floccule is continuously disintegrated again in the violent turbulence and is lifted by the airflow again, so that the slip speed between the gas and the solid is as high as tens of the slip speed of single particles; the top structure of the CFB desulfurizing tower 11 strengthens the returning of floccules, improves the bed density of particles in the tower, enables the Ca/S ratio in the bed to reach more than 50, greatly strengthens the mass transfer and heat transfer between gas and solid by the gas-solid two-phase flow mechanism in the circulating fluidized bed, provides fundamental guarantee for realizing high pollutant removal rate, enables the desulfurizing efficiency of the CFB desulfurizing tower 11 to reach 80-95%, realizes clean emission of flue gas, and is superior to national standards.
Example 2
As shown in fig. 1, on the basis of example 1, this example 2 provides an operating method of a mechanical rotary sludge incineration system, which is implemented by using the mechanical rotary sludge incineration system in the above example.
Conveying the wet sludge to a drier 4 for drying, and burning the dried sludge in a incinerator 8; and (3) feeding the incineration flue gas into a heat exchange device to respectively exchange heat with water, the drying tail gas and air, conveying the steam after heat exchange to a drying machine 4, and conveying the drying tail gas and the air after heat exchange and temperature rise to an incinerator 8.
Specifically, the incineration flue gas is sent to a waste heat boiler 9 to carry out primary heat exchange with water, and the exchanged steam is sent to a drier 4; and (3) sending the flue gas subjected to the first heat exchange into a waste heat recovery heat exchanger 10 to perform second heat exchange with the drying tail gas and the air respectively, and conveying the drying tail gas and the air subjected to the exchange and temperature rise to an incinerator 8.
And conveying the flue gas subjected to the second exchange to a CFB (circulating fluid bed) desulfurization tower 11 to remove acid gas, conveying the flue gas subjected to deacidification to a bag type dust collector 12 for dust removal, and conveying the flue gas subjected to dust removal to a chimney 14 for discharge.
In conclusion, the mechanical rotary sludge incineration system and the working method thereof couple the sludge drying and incineration processes, the heat generated by sludge incineration is sent to the heat exchange device for waste heat utilization, the generated steam is used for sludge drying, the heat exchange link is greatly simplified, the heat exchange efficiency is improved, the operation cost is reduced, the mechanical rotary sludge incineration system is suitable for treatment and disposal of municipal sewage sludge or part of industrial sludge with the water content of 60% -80%, the mechanical rotary sludge incineration system is suitable for treatment of sludge from a single source and sludge from various sources, the sludge reduction degree is reduced to the maximum extent, the sludge reduction degree reaches 90%, the final disposal is facilitated, and the problems that the sludge is buried to occupy land and cause secondary pollution are solved; wet air and odor carried by the indirectly dried tail gas are finally deodorized by burning, so that the problem of odor pollution is thoroughly solved; the CFB desulfurizing tower and the bag type dust collector effectively reduce the acid gas and dust content in the flue gas, realize the clean emission of the flue gas, and are superior to the national standard.
The components selected for use in the present application (components not illustrated for specific structures) are all common standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experimentation.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides a mechanical rotation sludge incineration system which characterized in that includes:
a drier, an incinerator and a heat exchange device; wherein
The drying machine is suitable for drying wet sludge and conveying dried tail gas to the heat exchange device;
the incinerator is suitable for incinerating dried sludge;
the heat exchange device is suitable for respectively carrying out heat exchange on incineration flue gas with water, drying tail gas and air, conveying the steam subjected to heat exchange to the drying machine, and conveying the drying tail gas subjected to heat exchange and temperature rise and the air to the incinerator.
2. The mechanical rotary sludge incineration system of claim 1,
the heat exchange device comprises a waste heat boiler and a waste heat recovery heat exchanger, and the waste heat boiler and the waste heat recovery heat exchanger are communicated through a lower-layer flue;
a liquid conveying channel is arranged in the waste heat boiler in a penetrating mode, the waste heat boiler is suitable for carrying out primary heat exchange on water in the liquid conveying channel and incineration flue gas in the boiler, and steam generated in the liquid conveying channel is conveyed to the drying machine;
and a tail gas channel and an air channel are arranged in the waste heat recovery heat exchanger in a penetrating manner, the waste heat recovery heat exchanger is suitable for carrying out secondary heat exchange on the dried tail gas in the tail gas channel and the air in the air channel and the flue gas subjected to primary heat exchange respectively, and conveying the dried tail gas and the air subjected to heat exchange and temperature rise to the incinerator.
3. The mechanical rotary sludge incineration system of claim 1,
the drier is an indirect drier and is suitable for drying wet sludge through steam heat conduction, and blades of the indirect drier are suitable for cutting and stirring the wet sludge so as to continuously update the drying surface of the wet sludge.
4. The mechanical rotary sludge incineration system of claim 2,
the flue gas outlet of the waste heat recovery heat exchanger is communicated with a flue gas treatment device and is suitable for purifying and discharging the flue gas output by the waste heat recovery heat exchanger;
the flue gas treatment device comprises a CFB desulfurization tower, a bag type dust collector and a chimney; wherein
The CFB desulfurizing tower is suitable for removing acid gas in the flue gas after the second heat exchange;
the bag type dust collector is suitable for removing dust from deacidified incineration flue gas and conveying the incineration flue gas to a chimney for emission.
5. The mechanical rotary sludge incineration system of claim 2,
a cyclone dust collector and a condenser are arranged between the drier and the waste heat recovery heat exchanger; wherein
The cyclone dust collector is suitable for removing dust from the dried tail gas and conveying the generated ash to the incinerator;
the condenser is suitable for condensing the tail gas after dust removal, and conveying the uncondensed tail gas to a tail gas channel in the waste heat recovery heat exchanger.
6. The mechanical rotary sludge incineration system of claim 1,
the mechanical rotary sludge incineration system also comprises a sludge bin and a drier feeding device; wherein
The sludge bin is internally provided with an arch breaking device which is suitable for breaking bridges for wet sludge stored in the sludge bin and conveying the wet sludge to a drier feeding device; and
the drier feeding device is suitable for conveying wet sludge to the drier.
7. The mechanical rotary sludge incineration system of claim 2,
the mechanical rotary sludge incineration system also comprises a slag bin and an ash bin; wherein
The slag bin is suitable for storing slag discharged by the incinerator, the waste heat boiler and the waste heat recovery heat exchanger;
the ash bin is suitable for storing fly ash discharged by the CFB desulfurization tower and the bag type dust collector.
8. The working method of the mechanical rotary sludge incineration system is characterized by comprising the following steps:
conveying the wet sludge to a drier for drying, and burning the dried sludge in an incinerator;
and (3) feeding the incineration flue gas into a heat exchange device to respectively exchange heat with water, the drying tail gas and air, conveying the steam after heat exchange to a drying machine, and conveying the drying tail gas and the air after heat exchange and temperature rise to an incinerator.
9. The method of claim 8, wherein the mechanical rotary sludge incineration system comprises,
the heat exchange device comprises a waste heat boiler and a waste heat recovery heat exchanger communicated with the waste heat boiler;
feeding the incineration flue gas into a waste heat boiler to perform primary heat exchange with water, and conveying the exchanged steam to a drier;
and (3) sending the flue gas subjected to the first heat exchange into a waste heat recovery heat exchanger to perform second heat exchange with the dried tail gas and the air respectively, and conveying the dried tail gas and the air subjected to the exchange and temperature rise to the incinerator.
10. The method of claim 9, wherein the mechanical rotary sludge incineration system comprises,
and conveying the flue gas subjected to the second exchange to a CFB (circulating fluid bed) desulfurization tower to remove acid gas, conveying the flue gas subjected to deacidification to a bag type dust collector for dust removal, and conveying the flue gas subjected to dust removal to a chimney for discharge.
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| CN202010441735.3A CN111473341A (en) | 2020-05-22 | 2020-05-22 | Mechanical rotary sludge incineration system and working method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112551854A (en) * | 2020-11-20 | 2021-03-26 | 核工业西南勘察设计研究院有限公司 | Municipal sludge drying treatment system |
| CN113587117A (en) * | 2021-07-20 | 2021-11-02 | 无锡雪浪环境科技股份有限公司 | System and method for harmlessly treating sludge |
-
2020
- 2020-05-22 CN CN202010441735.3A patent/CN111473341A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112551854A (en) * | 2020-11-20 | 2021-03-26 | 核工业西南勘察设计研究院有限公司 | Municipal sludge drying treatment system |
| CN113587117A (en) * | 2021-07-20 | 2021-11-02 | 无锡雪浪环境科技股份有限公司 | System and method for harmlessly treating sludge |
| CN113587117B (en) * | 2021-07-20 | 2024-03-19 | 无锡雪浪环境科技股份有限公司 | System and method for innocent treatment of sludge |
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