The content of the invention
The purpose of this utility model is to provide a kind of innocuity disposal system of domestic sludge, this system Construction expense is few,
Operating cost is low and sustainable operation, and a new way is opened for the harmless treatment and comprehensive utilization of resources of domestic sludge
Footpath.
To realize above-mentioned purpose of utility model, the utility model provides following technical scheme:
A kind of innocuity disposal system of domestic sludge, including the pretreatment system of dehydration pretreatment is carried out to domestic sludge
System, carry out mixing sludge the negative-pressure cyclic accumulation of heat incineration system of burning disposal, slag treatment system and carry out flue gas to flue gas
The flue gas purification system of purified treatment, it is characterised in that the pretreatment system includes:First batch mixer, filter press, for mixing
Second batch mixer of even mud cake, biomass carbon and chaff shell, multiple weighing balances and storage bin, wherein, the first batch mixer, filter press and
Second batch mixer passes sequentially through conveying arrangement and is connected.
This pretreatment system is so run, and sludge enters the first batch mixer, and sludge is mixed with adjusting material, then transport to
Filter press, carries out filter-press dehydration and obtains mud cake, and mud cake and leavening agent carried out secondary mixed mixing sludge, mixing sludge into
Enter negative-pressure cyclic accumulation of heat incineration system.The effect of aluminium polychloride is that quenched dehydration is played to sludge, makes to reach in steel band filter press
To more preferable dehydrating effect, the effect of lime is to carry out desulfurization process to sludge;Before press filtration, aluminium polychloride and stone are only added
Ash, avoiding directly adding leavening agent increases press filtration volume, meanwhile, this time press filtration only needs the water content of sludge is left from 80%
The right side is down to 60%, reduce further the difficulty and energy consumption of press filtration.Dewatered sludge, moisture content reduce, and viscosity reduces, again
Material is looser when being mixed, and is mixed with combustion adjuvant and leavening agent, reduces the moisture content of mixing sludge again, improves
The combustion heat value of sludge, secondary mixing it also avoid in press filtration due to lime, domestic sludge and aluminium polychloride property with and
The lamination of generation, makes material mixing more uniform, is more advantageous to the abundant burning of mixing sludge.
Preferably, first batch mixer (13) is used to mix domestic sludge, lime and aluminium polychloride, and described second is mixed
Material machine is used to mix mud cake, biomass carbon and chaff shell.
This pretreatment system is so run, and sludge enters the first batch mixer, and sludge is mixed with lime, aluminium polychloride
Close, then transport to filter press, carry out filter-press dehydration and obtain mud cake, mud cake and biomass carbon and chaff shell progress is secondary mixed
Mixing sludge, mixing sludge enter negative-pressure cyclic accumulation of heat incineration system.The effect of aluminium polychloride is that quenched take off is played to sludge
Water, makes to reach more preferable dehydrating effect in steel band filter press, and the effect of lime is to carry out desulfurization process to sludge;Before press filtration, only
Aluminium polychloride and lime are added, avoiding disposably adding chaff shell and biomass carbon increases press filtration volume, meanwhile, this time press
Filter only needs the water content of sludge being down to 60% from 80% or so, reduce further the difficulty and energy consumption of press filtration.It is dewatered
Sludge, moisture content reduce, and viscosity reduces, and material is looser when being mixed again, is mixed with chaff shell, biomass carbon,
Reduce the moisture content of mixing sludge again, improve the combustion heat value of sludge, secondary mixing it also avoid in press filtration due to lime,
Domestic sludge and aluminium polychloride property with and the lamination that produces, make material mixing more uniform, it is dirty to be more advantageous to mixing
The abundant burning of mud.
Preferably, first batch mixer is double-shaft spiral batch mixer or colter batch mixer, and second batch mixer is double
Axis spiral mixer or colter batch mixer, the filter press are steel band type filter press or plate and frame filter press.
Preferably, second batch mixer be double-shaft spiral batch mixer described in filter press be steel band type filter press.
Preferably, the innocuity disposal system of the domestic sludge further include to the innocuity disposal system of domestic sludge into
Row monitoring and the central control system of control.
Preferably, the negative-pressure cyclic accumulation of heat incineration system, including:There is cloth section, preheating section, section of lighting a fire successively, burn
Burn the incinerator of section and cooling section;Smoke circulating device above incineration section;Distribution device above cloth section and positioned at pre-
Hot arc, igniting section, incineration section and the extractor fan of cooling, the incinerator further include:Preheating cover, igniting above preheating section
The igniter of Duan Shangfang, the burning trolley that can be moved freely in cloth section, preheating section, igniting section, incineration section and cooling section and pre-
Warm-up cycle gas inlet on heat cover, the import of the warm-up cycle flue gas be used for the circulating flue gas from incineration section into
Enter.
The flue gas that the import of warm-up cycle flue gas produces burning enters preheating section, using the heat that burning produces to mixing
Sludge has carried out predrying, reduces the water content of mixing sludge, is conducive to it and fully burns, avoids mixing sludge and lighting a fire
Stage rests on low-temperature zone for a long time, weakens the temperature environment to form bioxin.
Preferably, the lower end of the distribution device is equipped with material scattering device.
Material scattering device can break up mixing sludge, loosely uniformly spread out, and be conducive to the abundant burning of mixing sludge.
Preferably, the smoke circulating device includes single or multiple independent flue gas covers, has circulating flue gas in flue gas cover
Import and air intlet, the extractor fan include three or more than three independent draught hoods, exhausting are connected with draught hood
Pipe, exhaust column are equipped with air pump;Draught hood is connected with first flue gas cover above incineration section below igniting section, position
Last draught hood below incineration section is connected with preheating cover, the draught hood below cooling section and gas cleaning system
System is connected.The circulating flue gas import makes the smoke secondary that burning produces be burned into incinerator, and air intlet makes air
Pouring in incinerator helps sludge fully to burn.Smoke circulating device is conducive to remove imperfect combustion in combustion product gases
Granulated carbon, carbon monoxide and organic matter, and carry out second-time burning, are particularly advantageous to remove the bioxin for burning and producing, make its
Decomposed under high temperature, while also recycled the heat for burning and producing.
Preferably, the slag treatment system is used to residue carrying out brickmaking, potting grain.
Preferably, the flue gas purification system includes heat exchanger, cyclone separator, desulfurizing tower, denitrating tower, carbonated drink point successively
From device, active carbon adsorber.
Heat exchanger will burn the flue gas heat exchange produced, is sent by air-introduced machine and flue dust is removed into sack cleaner, dedusting effect
Rate reaches more than 98%;Flue gas carries out spray sulphur removal by desulfurizing tower, and spray liquid is sodium hydroxide solution, and sodium hydroxide can be with
Sulfur dioxide in flue gas forms sodium sulfite, and sodium sulfite can by regenerating sodium hydroxide with calcium hydroxide reaction, from
And can realize that sodium hydroxide obtains circular regeneration, sulfur removal effectiveness Danone enough 60%, while spray liquid can also remove remaining flue dust;
Exhaust gas enters wet denitration tower after desulfurization, by spraying urea liquid and controlling solution PH to be reduced into the nitrogen oxides in flue gas
Nitrogen, can remove in flue gas more than 80% NOx;Flue gas after denitration is sent into steam-water separator, the cigarette in steam-water separator
Water in gas is separated can be used for the preparation of aluminium polychloride after collection, realize the secondary use of water;Flue gas passes through work
Property charcoal absorber, by activated carbon adsorption remove flue gas may remaining heavy metal, make flue gas up to standard.
The method for innocent treatment and system of domestic sludge provided by the utility model, have the advantage that:
1. employing the dehydration pretreatment system of secondary mixing, press filtration difficulty and energy consumption to domestic sludge are reduced, into
The abundant burning for making material mixing more uniform, being conducive to mixing sludge of one step;
2. negative-pressure cyclic accumulation of heat incineration system carries out burning disposal to sludge, the heat of sludge incineration generation is taken full advantage of
Amount, the flue gas produced to sludge incineration have carried out secondary use, have reduced the moisture content of mixing sludge, weaken bioxin generation
Temperature environment.
3. employing smoke circulating device, the flue gas produced to sludge incineration has carried out second-time burning, reduces in flue gas
The generation of pollutant, reduces the generation of pollutant, and flue gas is made flue gas reach discharge standard, realized by smoke processing system
Harmless treatment to sludge.
4. system Construction expense is few, operating cost is low, is opened up for the harmless treatment and comprehensive utilization of resources of domestic sludge
One new approach.
Embodiment 1
Referring to Fig. 1-2, a kind of innocuity disposal system of domestic sludge, including dehydration pretreatment is carried out to domestic sludge
Pretreatment system 1, carry out mixing sludge the negative-pressure cyclic accumulation of heat incineration system 2 of burning disposal, slag treatment system 3, to cigarette
Gas carries out the flue gas purification system 4 of gas cleaning processing and the innocuity disposal system of domestic sludge is monitored and controlled
Central control system (not indicating);The pretreatment system 1 includes:For mixing domestic sludge, lime and aluminium polychloride
The first batch mixer 13, the filter press 14 for press filtration sludge, the second batch mixer for mixing mud cake, biomass carbon and chaff shell
15, multiple weighing balances 12 and storage bin 11, wherein, the first batch mixer 13,14 and second batch mixer 15 of filter press are sequentially connected and connect,
First and second batch mixer 13,15 is specially double-shaft spiral batch mixer, and filter press 14 is steel band type filter press;The negative-pressure cyclic stores
Thermal incineration system 2 includes:There is cloth section 200, preheating section 201, igniting section 202, incineration section 203 and cooling section 204 successively
Incinerator 20;The smoke circulating device 22 of the top of incineration section 203;The distribution device 21 of the top of cloth section 200 and positioned at preheating
Section 201, igniting section 202, incineration section 203 and the extractor fan 23 of cooling, the incinerator 20 further include:On preheating section 201
Warm-up cycle gas inlet 207 on the preheating cover of side, the igniter 205 and preheating cover 206 of 202 top of igniting section, it is described pre-
The import of thermal cycle flue gas is used for the entrance of the circulating flue gas from incineration section 203;Smoke circulating device 22 includes single or more
A independent flue gas cover 222, has circulating flue gas import 220 and air intlet 221, the circulating flue gas import in flue gas cover 222
220 smoke secondaries for producing burning are burned into incinerator 20, and air intlet 221 makes air pour in incinerator 20
Sludge is helped fully to burn;The extractor fan 23 includes single or multiple independent draught hoods 230, is connected on draught hood 230
There is exhaust column 231, exhaust column 231 is equipped with air pump 232;The flue gas purification system 4 includes heat exchanger, cyclonic separation successively
Device, desulfurizing tower, denitrating tower, steam-water separator, active carbon adsorber;The slag treatment system 3 carries out brickmaking, system with by residue
Haydite.
The innocuity disposal system of the domestic sludge so works, by weighing balance 12 by domestic sludge, lime
Weigh, transport to 13 batch mixing of the first batch mixer in mass ratio with aluminium polychloride, stir evenly to obtain mixed once sludge, once mix
Close sludge to transport to filter press 14 after preliminary hydro-extraction, moisture content is changed into 68-73%, kinematic viscosity 10000-11000 centipoises.
Enter back into higher-pressure region to continue to be dehydrated to obtain mud cake, the moisture content of mud cake is reduced to 60% or so, 10500-11000 lis of kinematic viscosity
Pool.Based on domestic sludge original quality, biomass carbon dust and chaff shell are weighed, is made with mud cake by 15 batch mixing of batch mixer and mixes dirt
Mud.Mixing sludge is transported to distribution device 21, the material scattering device 210 of 21 lower end of distribution device, which breaks up mixing sludge, makes it
Loose equably to spread out on trolley 208 is burned, the thickness of the bed of material is 700mm.Burn trolley 208 and slide into preheating section 201, this
When, flue gas that the burning of incineration section 203 produces by extractor fan 23 is evacuated to preheating section 201, and (at this time, whole system is normally opened, more
A burning trolley 208 in preheating, igniting, burning and cooling stage is respectively positioned at cloth section 200, preheating section 201, igniting section
202nd, incineration section 203 and cooling section 204), predrying to material progress, after the completion of dry, material transportation is opened to section 202 of lighting a fire
Begin to light a fire to material upper strata, firing temperature is 800-900 DEG C, and the duration of ignition is 3-5 minutes, and at this time, extractor fan 23 is from igniting
The lower section of section 202 extracts igniting and produces the flue gas of imperfect combustion generation, and is delivered to incineration section 203, makes flue gas secondary combustion,
Meanwhile section 202 of lighting a fire forms subnormal ambient, the bed of material starts to burn from top to bottom, and material is delivered to incineration section 203, incineration section 203
Temperature is 800-1000 DEG C, and after the completion of burning, incineration residue is delivered to cooling section 204, and temperature is down to 300-800 DEG C.After cooling,
Residue is transported to slag treatment system 3, and residue is prepared into haydite or brick, this section of flue gas enters flue gas purification system 4, successively into
Enter heat exchanger, cyclone separator, desulfurizing tower, denitrating tower, steam-water separator, active carbon adsorber.The flue gas produced is burned to enter
Heat exchanger exchanges heat, and is sent afterwards by air-introduced machine to cyclone separator and removes flue dust by mesh bag, efficiency of dust collection more than 98%, is removed
Flue gas after dirt carries out spray sulphur removal into desulfurizing tower, and spray liquid is sodium hydroxide solution, sodium hydroxide can with flue gas
Sulfur dioxide forms sodium sulfite, and sodium sulfite can be by regenerating sodium hydroxide, so as to can realize with calcium hydroxide reaction
Sodium hydroxide obtains circular regeneration, and sulfur removal effectiveness is up to 60%, while spray liquid can also remove remaining flue dust;After desulfurization exhaust gas into
Enter denitrating tower wet denitration, it is real by spraying urea liquid and controlling solution PH that the nitrogen oxides in flue gas is reduced into nitrogen
The purpose of existing denitration, the method can remove in flue gas more than 80% NOx;Flue gas after denitration is sent into steam-water separator, in vapour
Water in separator in flue gas is separated can be used for the preparation of aluminium polychloride after collection;Hereafter, flue gas passes through work
Property charcoal absorber, by activated carbon adsorption remove flue gas may remaining heavy metal and bioxin, make flue gas up to standard.