CN110631020A - Dry sludge dewatering incinerator system and dry sludge dewatering incineration method thereof - Google Patents

Dry sludge dewatering incinerator system and dry sludge dewatering incineration method thereof Download PDF

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Publication number
CN110631020A
CN110631020A CN201910753881.7A CN201910753881A CN110631020A CN 110631020 A CN110631020 A CN 110631020A CN 201910753881 A CN201910753881 A CN 201910753881A CN 110631020 A CN110631020 A CN 110631020A
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China
Prior art keywords
incinerator
dehydrated dry
coal
dry sludge
slag
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CN201910753881.7A
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Chinese (zh)
Inventor
陈柏校
何小瑜
王成
夏玉坤
洪根惠
陈鑫波
李林
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Hangzhou Guotai Environmental Protection Technology Co Ltd
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Hangzhou Guotai Environmental Protection Technology Co Ltd
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Priority to CN201910753881.7A priority Critical patent/CN110631020A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44Details; Accessories
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50Control or safety arrangements

Abstract

The invention relates to a dehydrated dry sludge incinerator system and a dehydrated dry sludge incineration method thereof, and provides a technical scheme for solving the problems of poor sludge incineration effect and easy environmental pollution in the prior art: a dehydrated dry sludge incinerator system and a dehydrated dry sludge incineration method thereof; the system comprises a dehydrated dry mud incinerator system, a coal-fired feeding device, an incinerator, an air introducing device and a slag discharging device, wherein the upper part of the incinerator is provided with a limestone nozzle, a flue gas pipeline and an ammonia water spraying device for atomizing and spraying ammonia water, the inner wall of the incinerator is provided with a membrane water-cooled wall, and the lower part of the incinerator is respectively communicated with the dehydrated dry mud feeding device and the coal-fired feeding device; the air introducing device comprises a primary air introducing device and a secondary air introducing device. The method for incinerating the dehydrated dry sludge comprises the steps of material conveying, in-furnace incineration, desulfurization and denitrification, and flue gas and slag treatment. The invention can effectively improve the combustion efficiency, and the desulfurization and denitration treatment in the furnace can also reduce the burden of subsequent flue gas treatment.

Description

Dry sludge dewatering incinerator system and dry sludge dewatering incineration method thereof
Technical Field
The invention relates to a dehydrated dry sludge incinerator system and a dehydrated dry sludge incineration method thereof, which are mainly used for incinerating and disposing dehydrated dry sludge.
Background
Because the sludge contains a large amount of pathogens, heavy metals, persistent organic matters and other toxic and harmful substances, the sludge which is not properly treated can directly bring secondary pollution to water and atmosphere after entering the environment, thereby not only reducing the effective treatment capacity of a sewage treatment system, but also forming serious threats to the ecological environment and human activities. The existing main sludge treatment and disposal processes comprise landfill, digestion, composting, drying, incineration, wet oxidation, a freezing and melting method, a high-temperature sintering method and the like. As one of the methods for treating sludge, incineration has become the main direction of sludge treatment at present due to its remarkable advantages of high speed, small floor space, no need of long-term storage, etc.
For example, chinese patent publication No. CN102563666A, publication No. 7/11/2012, discloses a sludge incineration method and sludge incineration apparatus, in which air required for sludge combustion is introduced only by primary air intake, the combustion effect is poor, and pollutants in sludge are not treated, which may pollute the environment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a dehydrated dry sludge incinerator system and a dehydrated dry sludge incineration method thereof, wherein the system is reasonable in structural design, good in combustion stability, high in combustion efficiency, low in pollutant discharge and low in operation cost.
The technical scheme adopted by the invention for solving the problems is as follows: a dehydrated dry sludge incinerator system comprises a dehydrated dry sludge feeding device, a coal-fired feeding device, a slag discharging device, an incinerator and an air introducing device; the upper part of the incinerator is provided with a limestone nozzle and a flue gas pipeline; the lower part of the incinerator is provided with a coal-fired feed inlet connected with a coal-fired feed device and a dehydrated dry sludge feed inlet connected with a dehydrated dry sludge feed device; the air introducing device comprises a primary air introducing device and a secondary air introducing device; the primary air introducing device comprises a primary air pipe, a primary air chamber and a primary fan; the primary air chamber is fixed at the bottom of the incinerator; one end of the primary air pipe is fixed on the primary air chamber, and the other end of the primary air pipe is fixed on the primary fan; a plurality of primary air preheaters are arranged on the primary air pipes, and primary air adjusting valves are also arranged on the primary air pipes; the secondary air introducing device comprises a secondary air pipe, a secondary air chamber and a secondary fan; the secondary air chamber is fixed at the bottom of the incinerator; one end of the secondary air pipe is fixed on the secondary air chamber, and the other end of the secondary air pipe is fixed on the secondary fan; and a plurality of secondary air preheaters are arranged on the secondary air pipes, and secondary air adjusting valves are also arranged on the secondary air pipes. The dehydrated dry sludge incinerator system can enable dehydrated dry sludge and fuel to be mixed and fully combusted by adjusting primary air and secondary air, wherein the primary air is mainly used for fluidizing materials and mixing and combusting the materials, and the secondary air is mainly used for supplementing oxygen required by combustion and assisting the primary air to mix the materials, so that the design of the air introducing device can effectively improve the combustion efficiency.
Preferably, the dehydrated dry mud feeding device comprises a belt conveyor, a dehydrated dry mud hopper and a weighing type dehydrated dry mud feeder; the belt conveyor is connected with the dehydration dry mud hopper; the dewatering dry mud bucket is fixed on the weighing type dewatering dry mud feeder; the weighing type dehydrated dry mud feeder is connected with the dehydrated dry mud feeding port; the coal-fired feeding device comprises a coal conveying belt, a coal hopper and a weighing type coal feeder; the coal conveying belt is connected with the coal hopper; the coal hopper is fixed on the weighing type coal feeder; and the weighing type coal feeder is connected with the coal-fired feeding port. The design improves the automation degree of material feeding, so that the material can be continuously, efficiently and automatically fed, the labor intensity is effectively reduced, the labor force is saved, and the operation cost is reduced, and meanwhile, the labor efficiency is greatly improved.
Preferably, the slag discharging device comprises a slag discharging pipe, a slag cooler, a cold slag conveying pipe, a cold slag warehouse and a cold slag screw conveyor; one end of the furnace slag discharge pipe is fixed at the bottom of the incinerator, and the other end of the furnace slag discharge pipe is fixed on the slag cooler; a cooling water circulating pipe is arranged in the slag cooler; one end of the cold slag conveying pipe is communicated with the cold slag device, and the other end of the cold slag conveying pipe is communicated with the cold slag warehouse; and the cold slag storage is connected with the cold slag screw conveyor. The design improves the automation degree of slag discharging, and the slag can be continuously, efficiently and automatically discharged.
Preferably, the top of the incinerator is also provided with an ammonia water spraying device for atomizing and spraying ammonia water; the inner wall of the incinerator is provided with a membrane water-cooling wall, and the membrane water-cooling wall comprises a plurality of water-cooling pipelines and flat steel for connecting the water-cooling pipelines; the flat steel is welded on the water cooling pipeline. The invention adopts the membrane type water-cooled wall, and the furnace wall only needs heat insulation materials instead of refractory materials, so that the thickness and the weight of the furnace wall are greatly reduced, the structure of the furnace wall is simplified, and the total weight of the incinerator is reduced; the air tightness is good, the requirements of positive pressure combustion on the incinerator can be met, slag bonding is not easy to occur, air leakage is less, the heat loss of smoke exhaust is reduced, and the heat efficiency of the incinerator is improved; the installation is quick and convenient; easy maintenance is succinct, burns burning furnace's life can great improvement.
Preferably, the incinerator wall of the incinerator is provided with an inner flame retardant coating, a hollow layer and an outer heat insulation layer in sequence from inside to outside; the hollow layer is also communicated with a vacuum pump; the pressure in the hollow layer is between-0.005 MPa and-0.05 MPa; a temperature sensor is arranged in the incinerator, and a temperature sensor is arranged in the slag cooler. The vacuum pump can reduce the air in the hollow layer, so that the hollow layer becomes a micro-vacuum state, the heat transfer is reduced, the heat loss is avoided, and the heat insulation effect is achieved. The arrangement of the temperature sensor in the incinerator is beneficial to realizing the monitoring and control of the incinerator temperature, ensuring the reaction temperature to be uniform and stable in the material combustion process, and being beneficial to improving the thermal efficiency of the incinerator and improving the combustion efficiency of sludge; the temperature sensor in the slag cooler is beneficial to monitoring and controlling the temperature of the slag, ensures the uniform and stable temperature in the slag conveying process, can prevent the influence on the conveying stability caused by the overheating deformation of the slag conveying pipe due to the temperature of the slag, and can also prevent the occurrence of phenomena such as slag caking, conveying pipe blockage and the like in the conveying process caused by the supercooling of the temperature of the slag.
A dehydrated dry sludge incineration method of a dehydrated dry sludge incinerator system comprises the following steps;
s1: the dehydrated dry mud is conveyed to a dehydrated dry mud hopper through a belt conveyor and then is conveyed into an incinerator of the incinerator through a weighing type dehydrated dry mud feeder; meanwhile, the fire coal is conveyed to a coal hopper by a coal conveying belt, and is metered by a weighing type coal feeder and then is sent into an incinerator of the incinerator;
s2: the dewatered dry mud and the fire coal move from bottom to top under the action of primary air and are sent to a dense-phase region in the middle of the incinerator together with the original high-temperature materials in the incinerator for circular combustion; the secondary air is matched with the primary air to stir the materials and provide air required by combustion;
s3: at the high temperature of 890 ℃, air, dehydrated dry mud and coal are fully mixed and combusted in a dense-phase area in the middle of the incinerator, and a part of materials are carried by flue gas and enter a dilute-phase area in the upper part of the incinerator for further combustion; meanwhile, limestone powder is sprayed to the materials in the incinerator through a limestone nozzle on the upper part of the incinerator, and the limestone powder and the dehydrated dry mud are fully mixed at high temperature for desulfurization treatment;
s4: the smoke generated by combustion continuously rises and is fully mixed with the atomized ammonia water sprayed by the ammonia water spraying device from the upper part to remove NO in the smokex
S5: the flue gas leaves the incinerator through a flue gas pipeline, and then the flue gas is dedusted through a flue gas treatment device; then, the air passes through a primary air preheater and a secondary air preheater and exchanges heat with the air in the primary air preheater and the secondary air preheater; finally, the smoke reaching the emission standard is discharged into the atmosphere through a chimney;
s6: and the slag generated by incineration is discharged from a slag discharge pipe at the bottom of the incinerator in a mechanical slag removal mode, and is collected to a slag warehouse for temporary storage after being cooled by a slag cooler.
Preferably, in the present invention, before the dehydrated dry sludge is fed in S1, recovered ammonium sulfate is further added to the dehydrated dry sludge, and the recovered ammonium sulfate is prepared from an ammonium sulfate waste liquid. The design can save the using amount of the ammonia water, can solve the technical problem that a large amount of heat energy is consumed due to the fact that water in the ammonia water needs to be evaporated in the technical process, saves energy consumption in the technical process, solves the problem that the recycling of the ammonium sulfate is limited by the recycling of the ammonium sulfate, achieves the purposes of treating waste by waste and achieves the comprehensive recycling of waste.
Preferably, in the invention, the primary air and the secondary air in the step S2 are both high-temperature air flows; the secondary air is the waste gas in the bin sucked by a secondary fan from the sludge bin for storing the dehydrated dry sludge, and the waste gas in the bin is preheated by a secondary air preheater and then is sent into the incinerator through a secondary air chamber in the middle of the incinerator. The primary air and the secondary air are high-temperature air flows, so that the fluctuation of reaction temperature caused by low air temperature can be prevented, the stability of the temperature in the incinerator is ensured, the heat efficiency of the incinerator is favorably improved, and the combustion efficiency of sludge is improved; the secondary air is the waste gas in the mud bin pumped by the suction device, so that the waste gas in the mud bin can be incinerated, and the secondary pollution of the waste gas in the mud bin to the environment is effectively avoided; meanwhile, waste gas disposal facilities and compressed air supply facilities can be omitted, and equipment investment and operation and maintenance cost are greatly saved.
Preferably, in the invention, when the material is combusted in S2, the air volume and the air pressure of the primary air and the secondary air are adjusted by the primary air adjusting valve and the secondary air adjusting valve according to the combustion condition of the material. The design can effectively improve the incineration efficiency of the dehydrated dry mud and reduce harmful substances generated due to insufficient combustion. The design can make the temperature in the furnace uniform and stable, is favorable for improving the thermal efficiency of the incinerator and improving the combustion efficiency of the sludge.
Preferably, in the present invention, the limestone powder sprayed from the limestone nozzle in S3 is calcined at a high temperature to generate carbon dioxide and calcium oxide, and the calcium oxide reacts with sulfur dioxide generated in the combustion process to generate calcium sulfate. The design can remove sulfur dioxide in the flue gas. The design has good desulfurization effect and low operation cost, and can reduce the burden of subsequent flue gas treatment.
Compared with the prior art, the invention has the following advantages and effects:
1. the sludge combustion stability is good, the combustion effect is good: under the blowing of primary air and secondary air, the sludge is in a boiling state, and is continuously dried, crushed and combusted, so that the stability of the combustion process is good, and volatile components and carbon components in the sludge can be completely combusted, so that the sludge combustion effect is good;
2. the sludge combustion efficiency is high: the reaction temperature in the combustion process is uniform and stable, the thermal efficiency of the incinerator is high, and the high-efficiency combustion of the sludge is ensured;
3. low pollutant discharge, incineration temperature 850 ~ 950 ℃ and N2Generally, the large amount of NO is generated at a temperature higher than 1300 DEG Cx(ii) a Moreover, the incinerator system also adopts the step air supply combustion-supporting control, so that the concentration of oxygen required by combustion is reasonably distributed in the incinerator, and the pollutant NO is greatly reducedxGenerating CO;
4. because the incinerator temperature is higher than 850 deg.C and the furnace temperature is uniform, the mud is in the boiling form, the gas-solid is mixed fully and intensively, the intensity of combustion turbulence is large and the combustion is stable, make the mud fully burn out, the furnace smoke stays 3 ~ 4s at the high temperature in the stove at the same time, has inhibited the generating of dioxin effectively, make the discharge amount of the dioxin very little, far superior to the international discharge standard;
5. the operation cost is low: based on this incinerator system to sludge incineration process stability, high efficiency, effectively reduced the running cost of sludge incineration process.
Drawings
FIG. 1 is a schematic structural diagram of a dehydrated dry sludge incinerator system in an embodiment of the invention.
FIG. 2 is a flow chart of a method for dewatering dry sludge in a dewatering dry sludge incinerator system according to an embodiment of the present invention.
FIG. 3 is an enlarged view of the structure of part A in FIG. 1
In the figure: the system comprises a dehydrated dry mud feeding device 1, a coal-fired feeding device 2, an incinerator 3, an air introducing device 4, a slag discharging device 5, a flue gas treatment device 6, a belt conveyor 11, a dehydrated dry mud hopper 12, a weighing type dehydrated dry mud feeder 13, a coal conveying belt 21, a coal hopper 22, a weighing type coal feeder 23, a limestone nozzle 31, a flue gas pipeline 32, an ammonia water spraying device 33, a dehydrated dry mud feeding hole 34, a coal-fired feeding hole 35, a primary fan 411, a primary air pipe 412, a primary air preheater 413, a primary air chamber 414, a primary air regulating valve 415, a secondary fan 421, a secondary air pipe 422, a secondary air preheater 423, a secondary air chamber 424 and a secondary air regulating valve 425.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
The dewatered dry sludge incinerator system in the embodiment comprises a dewatered dry sludge feeding device 1, a coal-fired feeding device 2, an incinerator 3, an air introducing device 4 and a slag discharging device 5; the dehydrated dry mud feeding device 1 comprises a belt conveyor 11, a dehydrated dry mud hopper 12 and a weighing type dehydrated dry mud feeder 13; the belt conveyor 11 is connected with a dewatering dry mud hopper 12; the dehydrated dry mud hopper 12 is fixed on the weighing type dehydrated dry mud feeder 13; the weighing type dehydrated dry mud feeder 13 is connected with a dehydrated dry mud feeding port 34; the coal-fired feeding device 2 comprises a coal conveying belt 21, a coal hopper 22 and a weighing type coal feeder 23; the coal conveying belt 21 is connected with a coal hopper 22; the coal hopper 22 is fixed on the weighing type coal feeder 23; the weighing coal feeder 23 is connected to a coal feed port 35.
The upper part of the incinerator 3 in the embodiment is provided with a limestone nozzle 31 and a flue gas pipeline 32; the lower part of the incinerator 3 is provided with a coal feed inlet 35 connected with the coal feed device 2 and a dehydrated dry sludge feed inlet 34 connected with the dehydrated dry sludge feed device 1; the bottom of the incinerator 3 is communicated with a slag discharging device 5; an ammonia water spraying device 33 for atomizing and spraying ammonia water is also arranged at the top of the incinerator 3; the inner wall of the incinerator 3 is provided with a membrane water-cooling wall, and the membrane water-cooling wall comprises a plurality of water-cooling pipelines and flat steel for connecting the water-cooling pipelines; the flat steel is welded on the water cooling pipeline; a temperature sensor is also arranged in the incinerator 3; the furnace wall of the incinerator 3 is sequentially provided with an inner refractory layer 36, a hollow layer 37 and an outer insulating layer 38 from inside to outside; the hollow layer 37 is also in communication with the vacuum pump 7; the pressure inside the hollow layer 37 is between-0.005 MPa and-0.05 MPa.
The air introducing device 4 in the present embodiment includes a primary air introducing device and a secondary air introducing device; the primary air introducing device comprises a primary air pipe 412, a primary air chamber 414 and a primary fan 411; the primary air chamber 414 is fixed at the bottom of the incinerator 3; one end of the primary air pipe 412 is fixed on the primary air chamber 414, and the other end is fixed on the primary fan 411; a plurality of primary air preheaters 413 are arranged on the primary air pipe 412, and a primary air adjusting valve 415 is also arranged on the primary air pipe 412; the secondary air introducing device comprises a secondary air pipe 422, a secondary air chamber 424 and a secondary fan 421; the secondary air chamber 424 is fixed at the bottom of the incinerator 3; one end of the secondary air pipe 422 is fixed on the secondary air chamber 424, and the other end is fixed on the secondary fan 421; the secondary air duct 422 is provided with a plurality of secondary air preheaters 423, and the secondary air duct 422 is also provided with a secondary air adjusting valve 425.
The slag discharging device 5 in the present embodiment includes a slag discharging pipe 51, a slag cooler 52, a cold slag conveying pipe 53, a cold slag warehouse 54, and a cold slag screw conveyor 55; one end of the slag discharge pipe 51 is fixed at the bottom of the incinerator 3, and the other end is fixed on the slag cooler 52; a cooling water circulating pipe and a temperature sensor are arranged in the slag cooler 52; one end of the cold slag conveying pipe 53 is communicated with the cold slag device 52, and the other end is communicated with the cold slag warehouse 54; the cold slag storage 54 is connected to a cold slag screw conveyor 55.
The method for incinerating dehydrated dry sludge of the dehydrated dry sludge incinerator system in the embodiment comprises the following steps:
s1: adding recovered ammonium sulfate into the dehydrated dry mud, and fully mixing the recovered ammonium sulfate and the dehydrated dry mud; then, conveying the dehydrated dry mud mixed with the recovered ammonium sulfate to a dehydrated dry mud hopper 12 through a belt conveyor 11, and then conveying the dehydrated dry mud mixed with the recovered ammonium sulfate to an incinerator 3 of the incinerator through a weighing type dehydrated dry mud feeder 13; meanwhile, the fire coal is conveyed to a coal hopper 22 by a coal conveying belt 21, and is metered by a weighing type coal feeder 23 and then is sent into an incinerator 3 of the incinerator;
s2: the dehydrated dry mud and the fire coal move from bottom to top under the action of primary air and are sent to a dense-phase region in the middle of the incinerator 3 together with the original high-temperature materials in the incinerator 3 for circular combustion; the secondary air is matched with the primary air to stir the materials and provide air required by combustion; the primary air and the secondary air are high-temperature air flows; the secondary air is the waste gas in the bin sucked by the secondary fan 421 from the mud bin storing the dehydrated dry mud, and the waste gas in the bin is preheated by the secondary air preheater 423 and then is sent into the incinerator through the secondary air chamber 424 in the middle of the incinerator 3;
s3: at the high temperature of 890 ℃, air, dehydrated dry mud and coal are fully mixed and combusted in a dense-phase area in the middle of the incinerator 3, and a part of materials are carried by flue gas and enter a dilute-phase area in the upper part of the incinerator 3 for further combustion; meanwhile, limestone powder is sprayed to the materials in the incinerator 3 by the limestone nozzle 31 on the upper part of the incinerator 3 to carry out desulfurization treatment on the dehydrated dry mud, the limestone powder is calcined at high temperature to generate carbon dioxide and calcium oxide, and the calcium oxide reacts with sulfur dioxide generated in the combustion process to generate calcium sulfate;
s4: the smoke generated by combustion continues to rise and is fully mixed with the atomized ammonia water sprayed by the ammonia water spraying device 33 from the upper part to remove NO in the smokex
S5: the flue gas leaves the incinerator 3 via a flue gas duct 32, whereafter the flue gas is dedusted by a flue gas treatment device 6; then the air passes through a primary air preheater 413 and a secondary air preheater 423 to exchange heat with the air in the primary air preheater 413 and the secondary air preheater 423; finally, the smoke reaching the emission standard is discharged into the atmosphere through a chimney;
s6: slag generated by incineration is discharged from a slag discharge pipe 51 at the bottom of the incinerator 3 in a mechanical deslagging mode, is cooled by a slag cooler 52 and is collected to a slag warehouse 54 for temporary storage.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. All equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (10)

1. A dehydrated dry sludge incinerator system comprises a dehydrated dry sludge feeding device (1), a coal-fired feeding device (2) and a slag discharging device (5), and is characterized by also comprising an incinerator (3) and an air introducing device (4); the upper part of the incinerator (3) is provided with a limestone nozzle (31) and a flue gas pipeline (32); the lower part of the incinerator (3) is provided with a coal-fired feed inlet (35) connected with the coal-fired feed device (2) and a dehydrated dry sludge feed inlet (34) connected with the dehydrated dry sludge feed device (1); the bottom of the incinerator (3) is communicated with a slag discharging device (5); the air introducing device (4) comprises a primary air introducing device and a secondary air introducing device; the primary air introducing device comprises a primary air pipe (412), a primary air chamber (414) and a primary fan (411); the primary air chamber (414) is fixed at the bottom of the incinerator (3); one end of the primary air pipe (412) is fixed on the primary air chamber (414), and the other end is fixed on the primary fan (411); a primary air adjusting valve (415) and a plurality of primary air preheaters (413) are arranged on the primary air pipe (412); the secondary air introducing device comprises a secondary air pipe (422), a secondary air chamber (424) and a secondary fan (421); the secondary air chamber (424) is fixed at the bottom of the incinerator (3); one end of the secondary air pipe (422) is fixed on the secondary air chamber (424), and the other end is fixed on the secondary fan (421); and a secondary air adjusting valve (425) and a plurality of secondary air preheaters (423) are arranged on the secondary air duct (422).
2. A dehydrated dry sludge incinerator system according to claim 1, characterized in that the dehydrated dry sludge feeding means (1) comprises a belt conveyor (11), a dehydrated dry sludge hopper (12) and a weighted dehydrated dry sludge feeder (13); the belt conveyor (11) is connected with a dewatering dry mud hopper (12); the dehydration dry mud hopper (12) is fixed on the weighing dehydration dry mud feeder (13); the weighing type dehydrated dry mud feeder (13) is connected with a dehydrated dry mud feeding port (34); the coal-fired feeding device (2) comprises a coal conveying belt (21), a coal hopper (22) and a weighing type coal feeder (23); the coal conveying belt (21) is connected with a coal hopper (22); the coal hopper (22) is fixed on the weighing type coal feeder (23); the weighing coal feeder (23) is connected with the coal feeding port (35).
3. A dehydrated dry sludge incinerator system according to claim 1 wherein the slag discharge means (5) comprises a slag discharge pipe (51), a slag cooler (52), a cold slag delivery pipe (53), a cold slag reservoir (54) and a cold slag screw conveyor (55); one end of the slag discharge pipe (51) is fixed at the bottom of the incinerator (3), and the other end of the slag discharge pipe is fixed on the slag cooler (52); a cooling water circulating pipe is arranged in the slag cooler (52); one end of the cold slag conveying pipe (53) is communicated with the cold slag device (52), and the other end of the cold slag conveying pipe is communicated with the cold slag warehouse (54); the cold slag storage (54) is connected with a cold slag screw conveyor (55).
4. A dehydrated dry sludge incinerator system according to claim 1 characterized in that said incinerator (3) is also provided with an ammonia water spraying means (33) for atomizing and spraying ammonia water at the top; the inner wall of the incinerator (3) is provided with a membrane water-cooling wall, and the membrane water-cooling wall comprises a plurality of water-cooling pipelines and flat steel for connecting the water-cooling pipelines; the flat steel is welded on the water cooling pipeline.
5. A dehydrated dry sludge incinerator system according to claim 1 characterized in that the incinerator (3) walls are, in order from inside to outside, an inner refractory layer (36), a hollow layer (37) and an outer insulating layer (38); the hollow layer (37) is also communicated with a vacuum pump (7); the pressure in the hollow layer (37) is between-0.005 MPa and-0.05 MPa; a temperature sensor is also arranged in the incinerator (3); and a temperature sensor is arranged in the slag cooler (52).
6. A method of incinerating dehydrated dry sludge in a dehydrated dry sludge incinerator system according to any one of claims 1 to 5, wherein the method of incinerating dehydrated dry sludge comprises the steps of;
s1: the dehydrated dry mud is conveyed to a dehydrated dry mud hopper (12) through a belt conveyor (11), and then is conveyed into an incinerator (3) of the incinerator through a weighing type dehydrated dry mud feeder (13); meanwhile, the fire coal is conveyed to a coal hopper (22) by a coal conveying belt (21), and is metered by a weighing type coal feeder (23) and then is sent into an incinerator (3) of the incinerator;
s2: the dehydrated dry mud and the fire coal move from bottom to top under the action of primary air and are sent to a dense-phase area in the middle of the incinerator (3) together with the original high-temperature materials in the incinerator (3) for circular combustion; the secondary air is matched with the primary air to stir the materials and provide air required by combustion;
s3: at the high temperature of 890 ℃, air, dehydrated dry mud and coal are fully mixed and combusted in a dense-phase area in the middle of the incinerator (3), and a part of materials are carried by flue gas and enter a dilute-phase area at the upper part of the incinerator (3) for further combustion; meanwhile, limestone powder is sprayed to the materials in the incinerator (3) by a limestone nozzle (31) on the upper part of the incinerator (3), and the limestone powder and dehydrated dry mud are fully mixed at high temperature for desulfurization treatment;
s4: the smoke generated by combustion continues to rise and is fully mixed with the atomized ammonia water sprayed by the ammonia water spraying device (33) from the upper part to remove NO in the smokex
S5: the flue gas leaves the incinerator (3) through a flue gas pipeline (32), and then the flue gas is dedusted through a flue gas treatment device (6); then the air passes through a primary air preheater (413) and a secondary air preheater (423) to exchange heat with the air in the primary air preheater; finally, the smoke reaching the emission standard is discharged into the atmosphere through a chimney;
s6: slag generated by incineration is discharged from a slag discharge pipe (51) at the bottom of the incinerator (3) in a mechanical deslagging mode, is cooled by a slag cooler (52) and is collected to a slag warehouse (54) for temporary storage.
7. The method of incinerating dehydrated dry sludge in a system according to claim 6, wherein recovered ammonium sulfate is further added to the dehydrated dry sludge before the dehydrated dry sludge is fed in the step S1, and the recovered ammonium sulfate is produced from an ammonium sulfate waste liquid.
8. The method of claim 6, wherein the primary air and the secondary air in the S2 are both high temperature air flows; the secondary air is waste gas in the bin sucked by a secondary fan (421) from a mud bin for storing dehydrated dry mud, and the waste gas in the bin is preheated by a secondary air preheater (423) and then is sent into the incinerator by a secondary air chamber (424) in the middle of the incinerator (3).
9. The method of incinerating dehydrated dry sludge in a dehydrated dry sludge incinerator system according to claim 6, wherein the combustion of the materials in S2 is performed while adjusting the amount and pressure of the primary air and the secondary air according to the combustion condition of the materials by means of the primary air adjusting valve (415) and the secondary air adjusting valve (425).
10. The method of incinerating dehydrated dry sludge in accordance with claim 6, wherein the limestone powder sprayed from limestone nozzles (31) in S3 is calcined at high temperature to produce carbon dioxide and calcium oxide, and the calcium oxide reacts with sulfur dioxide generated in the combustion process to produce calcium sulfate.
CN201910753881.7A 2019-08-15 2019-08-15 Dry sludge dewatering incinerator system and dry sludge dewatering incineration method thereof Pending CN110631020A (en)

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CN101776271A (en) * 2010-03-12 2010-07-14 浙江大学 Fluidized bed incinerating device and process suitable for treatment of waste with low heating value
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Application publication date: 20191231