CN105948459A - Method using drying and incineration to treat sludge - Google Patents
Method using drying and incineration to treat sludge Download PDFInfo
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- CN105948459A CN105948459A CN201610335096.6A CN201610335096A CN105948459A CN 105948459 A CN105948459 A CN 105948459A CN 201610335096 A CN201610335096 A CN 201610335096A CN 105948459 A CN105948459 A CN 105948459A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/16—Treatment of sludge; Devices therefor by de-watering, drying or thickening using drying or composting beds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Hydrology & Water Resources (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
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- General Engineering & Computer Science (AREA)
- Treatment Of Sludge (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
The invention discloses a method using drying and incineration to treat sludge. The method includes: the pre-dewatered sludge of a sewage treatment plant is conveyed into a sludge bin, with an arch breaking function, of a system, then the sludge is conveyed to a horizontal stirring sludge drying machine through a sludge pump, and the sludge is subjected to stirring and indirect heat exchange to remove moisture and increase heat value and conveyed into a fluidized bed incinerator for incineration; smoke generated by the incineration is subjected to pre-dust-removing by a high-temperature separator and conveyed into a waste heat boiler system so as to recycle heat serving as the heat source of the drying machine, the processed smoke is conveyed into a preheater to preheat air entering the fluidized bed incinerator, and then the smoke enters a cloth-bag dust remover and is processed by a washing tower and discharged in a standard-reaching manner through a chimney; the tail gas generated by the drying machine is subjected to moisture recycling by a condenser and dust removing and then conveyed into the fluidized bed incinerator; fly ash is collected by a pneumatic conveying system to serve as a construction raw material. The method has the advantages that stable, harmless and recycling type sludge treatment can be achieved by the incineration of the dried sludge, the system effectively utilizes the incineration heat to serve as the heat source of the drying machine, and the smoke generated by the incineration is effectively treated and discharged in a standard-reaching manner.
Description
Technical field
The present invention relates to technical field of sludge disposal, particularly relate to a kind of sludge anhydration burning method of disposal.
Background technology
Sludge incineration is exactly the Organic substance utilizing incinerator under aerobic conditions in high-temperature oxydation mud, is allowed to the disposal options that permineralization is ashes.Mud directly burns, and because its moisture is higher, calorific value is the lowest, therefore requires supplementation with substantial amounts of fossil fuel, thus is greatly increased sludge treatment cost.Containing a certain amount of harmful substance in flue gas after sludge incineration, as hydrogen chloride, sulfide, heavy metal, two dislike because of etc..Therefore there is no rational anhydration and incineration technique and device, burning is the disposal options that cannot be accepted by people and natural environment.
Traditional incinerator is mainly circular combustion furnace, bed under higher wind (generally 8-12m/s) in vigorous fluidisation state.Circulating ratio is up to 10-20, and i.e. a large amount of bed and fuel mixed combustion also promote from top discharge incinerator, return incinerator through high-temp. vortex Posterior circle.Device power consumption is big, serious to equipment attrition, and in major part incinerator, arrange metallic heat exchanging tube or metal heated of other form, the material of high temperature and high speed circulation is even more serious to metal heated surface wear, maintenance and maintenance cost are high, and device lifetime is the most impacted.
Traditional incineration flue gas processes continues to use mode and the device that Hazards in Power Plant uses, backward in technique and inefficient.The most mostly using Wet Limestone/gypsum, natural limestone is resource-constrained, relatively costly, and by-product produces secondary pollution.
Therefore select suitable anhydration and incineration technique particularly important.
Summary of the invention
The invention aims to solve shortcoming present in prior art, and a kind of sludge anhydration burning disposing technique proposed and device.
To achieve these goals, present invention employs following technical scheme:
A kind of sludge anhydration burning method of disposal, includes the following:
The water treatment sludge of sewage treatment plant being transported in the special feed bin of mud of band hydraulic pressure balladeur train after mode preliminary hydro-extraction through machinery etc., hydraulic pressure balladeur train, by mud broken arch, is discharged continuously by bin bottom spiral, after in sludge pumping to horizontal sludge drying machine；
The steam that after sludge incineration, high-temperature flue gas produces with waste heat boiler is as sludge drying machine thermal source, it is passed through in the hollow axle of sludge drying machine and hollow disk and housing hollow clamping sleeve, mud conducts heat with high-efficiency steam while being stirred, mud after mummification is discharged bottom the sludge drying machine other end, after deliver to dewatered sludge feed bin through drag conveyor；
Dewatered sludge is fluidized the setting gauge of the high speed rotating of an incinerator after the conveying worm of dewatered sludge bin bottom and sheds in addition fluidized bed incinerator continuously, fluidized combustion furnace bottom is passed through preheated First air, and the dewatered sludge of a large amount of inert materials thereon and addition is blown afloat contact heat transfer deflagrate after air distribution plate by First air；
The tail gas evaporated in sludge drying machine is discharged through sludge drying machine top, after the cyclone dust extractor dedusting of band heat tracing, then the condensation of condensed device, water vapour is condensed into liquid, enters sewage disposal；In tail gas, fixed gas containing stink and harmful substance is delivered to fluidized bed incinerator mud through air-introduced machine together with the foul smell of suction on sludge storage bin top cover and adds entrance, and entering fluidized bed incinerator combustion together with mud is ashes；
Fluidized combustion furnace bottom sets slag-drip opening, unnecessary inert material and lime-ash be discharged after through bolting, big slag slag input storehouse is collected, the elevated sand storehouse that is delivered to of the suitable inert material of particle diameter, on-demand addition fluidized bed incinerator, to ensure inert material doses in it；
High-temperature flue gas after burning delivers to high temperature cyclone separator through fluidized bed incinerator top along the pipeline with thermal insulation layer containing a small amount of dust, dust separated after bottom whirlwind rotary valve discharge, flue gas after dedusting enters afterheat boiler system, and the steam of generation sends into the sludge drying machine thermal source as sludge drying machine after subtracting steady decompression.
Flue gas goes out afterheat boiler system and enters calandria preheater, the First air and secondary wind being blasted fluidized bed incinerator by primary air fan and overfire air fan is heated respectively, flue gas go out calandria preheater after through have insulation pipeline send into sack cleaner, difference according to sludge incineration after stain thing, activated carbon powder can be set on pipeline before entering sack cleaner and agstone adds entrance, blast by compressed air, for removing dioxin and heavy metal harmful substance, and below, sack cleaner is captured, flue gas enters sack cleaner and carries out dust removal by filtration, dust rotary valve bottom it is discharged；
Clean flue gas enters scrubbing tower through pipeline, and scrubbing tower sets multilamellar tower tray, with the setting sodium hydroxide solution washing of circulation, removes the hydrogen chloride in flue gas, sulfur dioxide, sulfur trioxide, heavy metal, residual dust, it is achieved wet method deacidification desulfurization；Scrubbing tower top sets demister, removes the drop in flue gas, reaches the tail gas of discharge standard through chimney high altitude discharge.
Preferably, by the dust discharged bottom cyclone dust extractor, preheater, sack cleaner, carried by air-transport system and be collected in flying dust storehouse, periodically outward transport, air-transport system is made up of pipeline, air-introduced machine, ash silo, bagroom, rotary discharge valve, relying on air-introduced machine to provide negative pressure to make air carry dust and enter ash silo collection together, and gas empties after bagroom filters, dust is periodically discharged by rotary discharge valve bottom ash silo.
Preferably, afterheat boiler system also can be replaced heat-conducting oil heating system, heats conduction oil with high-temperature flue gas, and conduction oil substitutes steam for sludge drying machine thermal source, and the conduction oil discharged from sludge drying machine returns again to heat-conducting oil heating system, circulating-heating.
Preferably, sludge drying machine includes housing, the built-in two horizontal blank mandrels of housing, hollow axle is provided with hollow disk or the hollow blade of multi-disc interlaced arrangement, housing and hollow axle junction set sealing, two hollow axle two ends set bearing block, hollow axle end sets swivel joint, swivel joint is provided with steam inlet and condensation-water drain, and hull outside sets chuck, and housing bottom has saddle, housing upper one end sets mud import, housing middle and upper part sets offgas outlet, sets dewatered sludge outlet bottom the housing other end, and dewatered sludge exit sets overflow baffle.
Preferably, fluidized bed incinerator is made up of burner hearth, air distribution plate, airduct, blast cap, combustor, burner, First air import, secondary air inlet of putting english, mud import, setting gauge, sand inlet, exhanst gas outlet, scum pipe, dilute-phase zone, emulsion zone it is followed successively by from top to bottom inside burner hearth, it is provided with, in the middle part of the lateral wall of burner hearth dilute-phase zone, secondary air inlet of putting english, mud import it is provided with bottom the lateral wall of burner hearth dilute-phase zone, mud is entered setting gauge by mud import, is shed entrance burner hearth emulsion zone by the setting gauge of high speed rotating；Burner hearth bottom is provided with air distribution plate, and air distribution plate sets multiple fresh air inlet, and fresh air inlet is inserted into airduct, airduct top sets blast cap, and cylindrical blast cap sidewall is provided with multiple air inlet, and First air import fresh air inlet from air distribution plate enters airduct, enter blast cap afterwards, enter burner hearth from blast cap sidewall air inlet；Burner hearth bottom sets combustor, and sets burner apparatus for starting fluidized bed incinerator.
A kind of sludge anhydration burning method of disposal that the present invention proposes, can make the whole carbonization of Organic substance, kill pathogen, at utmost volume reduction, and its product is aseptic, the inorganic residues of odorless.Treat that dewatered sludge is continuously added in sludge drying machine from mud import, the saturated vapor steam of 0.3-0.8Mpa is after swivel joint enters hollow axle, respectively enter in hollow blade or hollow disk, hollow blade or hollow disk provide a large amount of heat exchange areas, mutual self-cleaning in two axle rotation processes, to sludge agitation.Steam and mud indirect heat exchange, be passed through steam in housing chuck simultaneously, conducts heat the mud in housing.Mud is heated up simultaneously and is evaporated by the moisture in mud by stirring, and the moisture evaporated is extracted out sludge drying machine by air-introduced machine, enters fluidized bed incinerator burning after dedusting, condensation recycle-water.
Fluidized bed incinerator of the present invention uses air stage feeding technology, and First air sends into burner hearth by the air distribution plate bottom emulsion zone, it is ensured that provide enough air for sludge incineration while bed active fluidization；Appropriate secondary wind of putting english sprays in stove in burner hearth dilute-phase zone lower tangential, vortical flow is formed at dilute-phase zone, strengthen the disturbance of burner hearth dilute-phase zone, make to be sufficiently mixed between gas and gas and gas and solid, it is ensured that the fine ash that the after-flame of dilute-phase zone volatile matter and part emulsion zone fly away from is burnt further.Secondary wind of simultaneously putting english has certain centrifugation to the fine ash in flue gas, it is possible to decrease furnace outlet flue gas dust content, reduces the abrasion to equipment such as cyclone separator, waste heat boiler, preheaters, reduces the load of fume treatment auxiliary simultaneously.
The present invention is by sludge drying and burns combination, burns and produces heat for mummification.Sludge drying tail gas influent stream fluidized-bed incineration stove burn, can fully effective removal mummification produce foul smell and harmful substance.Sludge drying machine uses indirect heat exchange mode, and thermal source does not contacts with mud, and do not intersect pollution, and tail gas treatment device is little, and the thermal efficiency is high.Fluidized bed incinerator uses low wind speed fluidized bed incinerator, and is not provided with heating surface in stove, and device power consumption is low, and service life significantly improves, and makes, overhauls and safeguard simple.Using bag-type dust to be combined with scrubbing tower, as dedusting, desulfurization deacidification, go the processing mode of the harmful substances such as removing heavy metals, cost is low, use cost is low, efficiency is high.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of sludge anhydration burning method of disposal that the present invention proposes.
Fig. 2 is the structural representation of the sludge drying machine that a kind of sludge anhydration burning method of disposal that the present invention proposes uses.
Fig. 3 is the structural representation of the fluidized bed incinerator that a kind of sludge anhydration burning method of disposal that the present invention proposes uses.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.
With reference to Fig. 1-3, a kind of sludge anhydration burning method of disposal, include the following:
By the water treatment sludge of sewage treatment plant through filter pressing, the mode preliminary hydro-extraction such as centrifugal, after typically up to less than 80% moisture content, being transported in the special feed bin of mud of band hydraulic pressure balladeur train, hydraulic pressure balladeur train is by mud broken arch, discharged continuously by bin bottom spiral, after through sludge pumping in horizontal sludge drying machine；
The steam that after sludge incineration, high-temperature flue gas produces with waste heat boiler is as sludge drying machine thermal source, it is passed through in the hollow axle of sludge drying machine and hollow disk and housing hollow clamping sleeve, mud conducts heat with high-efficiency steam while being stirred, mud after mummification is discharged bottom the sludge drying machine other end, after deliver to dewatered sludge feed bin through drag conveyor；
Dewatered sludge is fluidized the setting gauge of the high speed rotating of an incinerator after the conveying worm of dewatered sludge bin bottom and sheds in addition fluidized bed incinerator continuously, fluidized combustion furnace bottom is passed through preheated First air, and the dewatered sludge of a large amount of inert materials thereon and addition is blown afloat contact heat transfer deflagrate after air distribution plate by First air；
The tail gas evaporated in sludge drying machine is discharged through sludge drying machine top, after the cyclone dust extractor dedusting of band heat tracing, then the condensation of condensed device, water vapour is condensed into liquid, enters sewage disposal；In tail gas, fixed gas containing stink and harmful substance is delivered to fluidized bed incinerator mud through air-introduced machine together with the foul smell of suction on sludge storage bin top cover and adds entrance, and entering fluidized bed incinerator combustion together with mud is ashes；
Fluidized combustion furnace bottom sets slag-drip opening, unnecessary inert material and lime-ash be discharged after through bolting, big slag slag input storehouse is collected, the elevated sand storehouse that is delivered to of the suitable inert material of particle diameter, on-demand addition fluidized bed incinerator, to ensure inert material doses in it；Inert material is typically chosen quartz sand high temperature resistant, that proportion is bigger, and particle diameter is generally 0.8-1.6mm.
High-temperature flue gas after burning delivers to high temperature cyclone separator through fluidized bed incinerator top along the pipeline with thermal insulation layer containing a small amount of dust, dust separated after bottom whirlwind rotary valve discharge, flue gas after dedusting enters afterheat boiler system, it is typically chosen the saturated vapor producing pressure 1.0M Pa, steam reaches the about 0.5Mpa feeding sludge drying machine thermal source as sludge drying machine, if there being residual steam to can be used for heat supply etc. through subtracting steady decompression.
Flue gas goes out afterheat boiler system and enters calandria preheater, the First air and secondary wind being blasted fluidized bed incinerator by primary air fan and overfire air fan is heated respectively, flue gas go out calandria preheater after through have insulation pipeline send into sack cleaner, difference according to sludge incineration after stain thing, activated carbon powder can be set on pipeline before entering sack cleaner and agstone adds entrance, blast by compressed air, for removing dioxin and heavy metal harmful substance, and below, sack cleaner is captured, flue gas enters sack cleaner and carries out dust removal by filtration, dust rotary valve bottom it is discharged；
Clean flue gas enters scrubbing tower through pipeline, scrubbing tower sets multilamellar tower tray, typically set three layers, setting sodium hydroxide solution washing with circulation, general concentration is 10-15%, concentration need to be improved when being reduced to 3%, remove the hydrogen chloride in flue gas, sulfur dioxide, sulfur trioxide, heavy metal, residual dust, it is achieved wet method deacidification desulfurization；Scrubbing tower top sets demister, removes the drop in flue gas, reaches the tail gas of discharge standard through chimney high altitude discharge；
By the dust discharged bottom cyclone dust extractor, preheater, sack cleaner, carried by air-transport system and be collected in flying dust storehouse, periodically outward transport, air-transport system is made up of pipeline, air-introduced machine, ash silo, bagroom, rotary discharge valve, rely on air-introduced machine to provide negative pressure to make air carry dust and enter ash silo collection together, and gas empties after bagroom filters, dust is periodically discharged by rotary discharge valve bottom ash silo.
Afterheat boiler system also can be replaced heat-conducting oil heating system, heats conduction oil with high-temperature flue gas, and conduction oil substitutes steam for sludge drying machine thermal source, and conduction oil temperature controls at 200-250 degree.The conduction oil discharged from sludge drying machine returns again to heat-conducting oil heating system, circulating-heating.
In a particular embodiment, according to character and the difference of calorific value of mud, or investor, around natural environment and the artificial difference required, in fluidized bed incinerator, substance can be different, and the flue gas processing device after sludge incineration can difference.
nullIn the present invention，Sludge drying machine includes housing 100，The built-in two horizontal blank mandrels 101 of housing 100，Hollow axle 101 is provided with the hollow disk 102 of multi-disc interlaced arrangement，Housing 100 and hollow axle 101 junction set sealing，Two hollow axle 101 two ends set bearing block 103，Hollow axle 101 end sets swivel joint 104，Swivel joint 104 is provided with steam inlet 105 and condensation-water drain 106，Hollow axle 101 the other end is driven by driving means 113，Housing 100 is outside sets chuck 107，Saddle 108 is had bottom housing 100，Housing 100 upper one end sets mud import 109，Housing 100 middle and upper part sets offgas outlet 110，Dewatered sludge outlet 111 is set bottom housing 100 other end，Dewatered sludge exports and sets overflow baffle 112 at 111.
Treat that dewatered sludge is continuously added in sludge drying machine from mud import, the saturated vapor steam of 0.3-0.8Mpa is after swivel joint 104 enters hollow axle 101, respectively enter in hollow disk 102, hollow disk 102 provides a large amount of heat exchange area, mutual self-cleaning in two hollow axle 101 rotation processes, to sludge agitation.Steam and mud indirect heat exchange, be passed through steam in housing chuck 107 simultaneously, conducts heat the mud in housing.Mud is heated up simultaneously and is evaporated by the moisture in mud by stirring, and the moisture evaporated is extracted out sludge drying machine by air-introduced machine, enters fluidized bed incinerator burning after dedusting, condensation recycle-water.Mud after mummification crosses overflow baffle 112, discharges sludge drying machine from dewatered sludge outlet.Becoming condensed water after steam heat-exchanging, the condensed water of axle and housing chuck 107 discharges sludge drying machine from swivel joint 104 and condensed water interface 106 respectively.
This type of sludge drying machine belongs to indirect heat exchange equipment, and mud does not directly contact with thermal source, and vent gas treatment amount is greatly reduced, and the heat that tail gas is taken out of is few, therefore the thermal efficiency is high.One ton of water of general evaporation, steam consumption is about 1.3 tons.The time of staying of mud is easily controllable, therefore after the mummification degree of depth i.e. mummification, the water content of mud is easily controllable.Separate unit disc type sludge drying machine heat exchange area can accomplish 450, and semi-oriented Treatment of Sludge ability is up to 120 ton day.Moisture before mummification is generally 70-80%, and the moisture after mummification is generally 25-45%.
After sludge semi-dry, i.e. moisture after mummification is generally 25-45%, most of sludge semi-dries the calorific value of mud can be improved to can self-sustaining burning, the flue gas waste heat recovery heat after burning just meets mummification needs, it is ensured that system thermal self-balancing.If absolutely dryization, then sludge drying machine heat demand will be short of, and requires supplementation with fuel.Character according to different mud is different, and calorific value is different, it is achieved the different semi-oriented degree of depth, makes system thermal self-balancing as far as possible, so can be substantially reduced the cost of disposal of mud.
nullIn the present invention，Fluidized bed incinerator is by burner hearth 200、Air distribution plate 206、Blast cap 207、Combustor 209、Burner 211、First air import 210、Put english secondary air inlet 208、Mud import 212、Setting gauge 213、Sand inlet 215、Exhanst gas outlet 214、Scum pipe 216 forms，Flame retardant coating 201 it is respectively from inside to outside in burner hearth 200、Heat-insulation layer 202、Steel plate layer 203，Burner hearth 200 is internal is followed successively by dilute-phase zone 205 from top to bottom、Emulsion zone 204，Secondary air inlet 208 of putting english it is provided with in the middle part of the lateral wall of burner hearth dilute-phase zone 205，Secondary air inlet 208 bottom of putting english is provided with the sand inlet 215 led within burner hearth，Mud import 212 it is provided with bottom the lateral wall of burner hearth dilute-phase zone 205，Mud is entered setting gauge 213 by mud import 212，Entrance burner hearth emulsion zone 204 is shed by the setting gauge 213 of high speed rotating；Air distribution plate 206 it is provided with bottom burner hearth 200, burner hearth 200 top is provided with exhanst gas outlet 214, multiple fresh air inlet is set on air distribution plate 206, fresh air inlet is inserted into airduct, and airduct top sets blast cap 207, and cylindrical blast cap 207 sidewall is provided with multiple air inlet, the First air import 210 fresh air inlet from air distribution plate 206 enters airduct, enter blast cap 207 afterwards, enter burner hearth 200 from blast cap 207 sidewall air inlet, can effectively prevent bed from leaking down from air distribution plate 206；Air distribution plate 206 is provided with the scum pipe 216 led to outside burner hearth.
Typically using corundum refractory brick to build by laying bricks or stones at flame retardant coating 201 straight section, other irregularities uses corundum refractory castable cast.Sharp comer is not set in burner hearth.
Set combustor 209 bottom burner hearth 200, and set burner apparatus 211 for starting fluidized bed incinerator.Fluidized combustion Control for Kiln Temperature is at 800-900 DEG C, and mud is entered setting gauge 213 by mud import 212, is shed entrance burner hearth emulsion zone 204 by the setting gauge 213 of high speed rotating.Fixed carbon in mud is concentrated mainly on emulsion zone 204 and burns, and volatile fraction major part is burnt at dilute-phase zone 205.
Fluidized bed incinerator uses air stage feeding technology, and First air sends into burner hearth 200 by the air distribution plate 206 bottom emulsion zone, it is ensured that provide enough air for sludge incineration while bed active fluidization；Appropriate secondary wind of putting english sprays in stove in burner hearth dilute-phase zone 205 lower tangential, vortical flow is formed at dilute-phase zone 205, strengthen the disturbance of burner hearth dilute-phase zone 205, make to be sufficiently mixed between gas and gas and gas and solid, it is ensured that the fine ash that the after-flame of dilute-phase zone 205 volatile matter and part emulsion zone 204 fly away from is burnt further.Secondary wind of simultaneously putting english has certain centrifugation to the fine ash in flue gas, it is possible to decrease furnace outlet flue gas dust content, reduces the abrasion to equipment such as cyclone separator, waste heat boiler, preheaters, reduces the load of fume treatment auxiliary simultaneously.
Burning coefficient of excess air and be typically chosen 1.3-1.4, First air accounts for the 50-60% of total blast volume, and fluidized bed incinerator gas residence time is more than 2 seconds, to ensure to burn completely.Flue gas is wind speed 1.5-4m/s in fluidized bed incinerator, and fluidized combustion burner hearth height is typically no less than 4m.
Mud is i.e. broken up by a large amount of high temperature inert bed of emulsion zone 204 in entering fluidized bed incinerator, therefore does not haves situation about cohering.For the sulphion contained in mud and chloride ion etc., adding a certain proportion of limestone in mud can realize furnace sulfur fixation and solid chlorine, the most so-called desulfuration in furnace, can greatly reduce the generation of sulfur dioxide and hydrogen chloride, reduces flue gas purifying equipment load.Scum pipe 216 is connected with air distribution plate 206, and bed unnecessary after burning is discharged from scum pipe 216, it is ensured that bed resistance is within the specific limits.Sand inlet is used for adding and supplementing inert bed material.
In the present invention, sludge incineration is exactly the Organic substance utilizing fluidized bed incinerator under aerobic conditions in high-temperature oxydation mud, is allowed to the disposal options that permineralization is ashes.Burn after sludge drying and can effectively utilize the calorific value of mud, and maximum realizes the minimizing of mud, stabilisation, innoxious.Because mud is contained within substantial amounts of organic matter, therefore have certain calorific value, when sludge calorific value is more than 800 kilocalorie, can be not required in theory add auxiliary fuel with self-sustaining burning, and sludge drying can be effectively improved the calorific value of mud, major part mud after mummification calorific value up to 1200 kilocalories more than, not only be not required to add auxiliary fuel and also can externally heat export.Sludge incineration is mud the most thoroughly, can make the whole carbonization of Organic substance, kill pathogen, at utmost volume reduction, and its product is aseptic, the inorganic residues of odorless.
The above; it is only the present invention preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; any those familiar with the art is in the technical scope that the invention discloses; according to technical scheme and inventive concept equivalent or change in addition thereof, all should contain within protection scope of the present invention.
Claims (5)
1. a sludge anhydration burning method of disposal, it is characterised in that include the following:
The water treatment sludge of sewage treatment plant being transported to after preliminary hydro-extraction in the special feed bin of mud of band hydraulic pressure balladeur train, hydraulic pressure balladeur train, by mud broken arch, is discharged continuously by bin bottom spiral, after through sludge pumping in horizontal sludge drying machine；
The steam that after sludge incineration, high-temperature flue gas produces with waste heat boiler is as sludge drying machine thermal source, it is passed through in the hollow axle of sludge drying machine and hollow disk and housing hollow clamping sleeve, mud conducts heat with high-efficiency steam while being stirred, mud after mummification is discharged bottom the sludge drying machine other end, after deliver to dewatered sludge feed bin through drag conveyor；
Dewatered sludge is fluidized the setting gauge of the high speed rotating of an incinerator after the conveying worm of dewatered sludge bin bottom and sheds in addition fluidized bed incinerator continuously, fluidized combustion furnace bottom is passed through preheated First air, and the dewatered sludge of a large amount of inert materials thereon and addition is blown afloat contact heat transfer deflagrate after air distribution plate by First air；
The tail gas evaporated in sludge drying machine is discharged through sludge drying machine top, after the cyclone dust extractor dedusting of band heat tracing, then the condensation of condensed device, water vapour is condensed into liquid, enters sewage disposal；In tail gas, fixed gas containing stink and harmful substance is delivered to fluidized bed incinerator mud through air-introduced machine together with the foul smell of suction on sludge storage bin top cover and adds entrance, and entering fluidized bed incinerator combustion together with mud is ashes；
Fluidized combustion furnace bottom sets slag-drip opening, unnecessary inert material and lime-ash be discharged after through bolting, big slag slag input storehouse is collected, the elevated sand storehouse that is delivered to of the suitable inert material of particle diameter, on-demand addition fluidized bed incinerator, to ensure inert material doses in it；
High-temperature flue gas after burning delivers to high temperature cyclone separator through fluidized bed incinerator top along the pipeline with thermal insulation layer containing a small amount of dust, dust separated after bottom whirlwind rotary valve discharge, flue gas after dedusting enters afterheat boiler system, and the steam of generation sends into the sludge drying machine thermal source as sludge drying machine after subtracting steady decompression；
Flue gas goes out afterheat boiler system and enters calandria preheater, the First air and secondary wind being blasted fluidized bed incinerator by primary air fan and overfire air fan is heated respectively, flue gas go out calandria preheater after through have insulation pipeline send into sack cleaner, difference according to sludge incineration after stain thing, activated carbon powder can be set on pipeline before entering sack cleaner and agstone adds entrance, blast by compressed air, for removing dioxin and heavy metal harmful substance, and below, sack cleaner is captured, flue gas enters sack cleaner and carries out dust removal by filtration, dust rotary valve bottom it is discharged；
Clean flue gas enters scrubbing tower through pipeline, and scrubbing tower sets multilamellar tower tray, with the finite concentration sodium hydrate aqueous solution washing of circulation, removes the hydrogen chloride in flue gas, sulfur dioxide, sulfur trioxide, heavy metal, residual dust, it is achieved wet method deacidification desulfurization；Scrubbing tower top sets demister, removes the drop in flue gas, reaches the tail gas of discharge standard through chimney high altitude discharge.
A kind of sludge anhydration burning method of disposal the most according to claim 1, it is characterized in that: by the dust discharged bottom cyclone dust extractor, preheater, sack cleaner, carried by air-transport system and be collected in flying dust storehouse, periodically outward transport, air-transport system is made up of pipeline, air-introduced machine, ash silo, bagroom, rotary discharge valve, rely on air-introduced machine to provide negative pressure to make air carry dust and enter ash silo collection together, and gas empties after bagroom filters, dust is periodically discharged by rotary discharge valve bottom ash silo.
A kind of sludge anhydration burning method of disposal the most according to claim 1, it is characterized in that, afterheat boiler system also can be replaced heat-conducting oil heating system, conduction oil is heated with high-temperature flue gas, conduction oil substitutes steam for sludge drying machine thermal source, the conduction oil discharged from sludge drying machine returns again to heat-conducting oil heating system, circulating-heating.
4. according to a kind of sludge anhydration burning method of disposal described in claim 1 or 3, it is characterized in that, sludge drying machine includes housing, the built-in two horizontal blank mandrels of housing, hollow axle is provided with hollow disk or the hollow blade of multi-disc interlaced arrangement, housing and hollow axle junction set sealing, two hollow axle two ends set bearing block, hollow axle end sets swivel joint, swivel joint is provided with steam inlet and condensation-water drain, hull outside sets chuck, housing bottom has saddle, housing upper one end sets mud import, housing middle and upper part sets offgas outlet, dewatered sludge outlet is set bottom the housing other end, dewatered sludge exit sets overflow baffle.
A kind of sludge anhydration burning method of disposal the most according to claim 1, it is characterized in that, fluidized bed incinerator is by burner hearth, air distribution plate, airduct, blast cap, combustor, burner, First air import, put english secondary air inlet, mud import, setting gauge, sand inlet, exhanst gas outlet, scum pipe forms, dilute-phase zone it is followed successively by from top to bottom inside burner hearth, emulsion zone, it is provided with, in the middle part of the lateral wall of burner hearth dilute-phase zone, secondary air inlet of putting english, mud import it is provided with bottom the lateral wall of burner hearth dilute-phase zone, mud is entered setting gauge by mud import, entrance burner hearth emulsion zone is shed by the setting gauge of high speed rotating；Burner hearth bottom is provided with air distribution plate, and air distribution plate sets multiple fresh air inlet, and fresh air inlet is inserted into airduct, airduct top sets blast cap, and cylindrical blast cap sidewall is provided with multiple air inlet, and First air import fresh air inlet from air distribution plate enters airduct, enter blast cap afterwards, enter burner hearth from blast cap sidewall air inlet；Burner hearth bottom sets combustor, and sets burner apparatus for starting fluidized bed incinerator.
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