CN102322642A - Sludge drying and incinerating system on basis of incineration of waste grate furnace and treatment method thereof - Google Patents
Sludge drying and incinerating system on basis of incineration of waste grate furnace and treatment method thereof Download PDFInfo
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Abstract
The invention relates to a sludge drying and incinerating system on the basis of incineration of a waste grate furnace and a treatment method thereof. In the system, after entering a factory, sludge with the moisture content of 80 percent is unloaded into a front material storage bin; the sludge is quantitatively fed into a conditioning tank by a sludge screw conveyer at the bottom of the front material storage bin under a uniform speed; when the sludge enters the conditioning tank, dilution water and the sludge are added into the conditioning tank according to a weight ratio of the dilution water to the sludge of 1:1; when the sludge reaches a high limit liquid level, the sludge is stopped being added; the mixture is stirred uniformly to complete conditioning the sludge; the conditioned sludge with the moisture content of 90 percent is fed into a two-diaphragm vacuum air compressor through a sludge screw pump to be subjected to pressure filtration dehydration and steam heating drying, wherein a dehydrated and dried sludge cake has the moisture content of below 30 percent; after waste heat gas generated in the drying process of the sludge is vacuumized and condensed, wastewater is generated, enters a sewage treatment system to be treated and is discharged after reaching the standard; the waste gas is collected and enters a waste pond of a waste grate furnace incineration system; after the dried sludge is crushed by a crusher, the dried sludge and municipal domestic waste are fed into the grate incineration furnace to be incinerated according to a certain ratio; and the waste gas, fly ash, slags and the like which are generated in the incinerating process can be treated by the existing treatment system of a waste incineration power plant.
Description
Invention field
The invention relates to the processing method of city domestic sewage treatment plant mud, be meant a kind of sludge drying and incineration system and processing method thereof of burning especially based on the refuse furnace grate furnace.
Background technology
Along with urbanization process is accelerated, population is concentrated to cities and towns gradually in recent years, and the city domestic sewage generation is more and more, and sanitary sewage is through biochemical treatment, when sewage is purified, with producing a large amount of excess sludges.This sludge moisture content is high, perishable, strong stink is arranged, and contain parasitic ovum, pathogenic microorganism and heavy metal, and as not dealing carefully with, discharging will cause serious secondary pollution arbitrarily.
Moisture percentage in sewage sludge is high more, and its calorific value is low more, and moisture content is the key issue of restriction Treatment of Sludge and recycling, so deeply dehydrating sludge is to solve the mud key of problem.Before getting into the burning line, must carry out drying and other treatment to mud, moisture percentage in sewage sludge is reduced to below 60% from 80%; Drying and other treatment to mud has multiple new-type processing method such as fluid bed, belt, rotating disc type, thin layer turbine, hollow blade at present; These drying techniques have many outstanding advantages, but in processing procedure, still need consume lot of energy, and in processing procedure, can produce waste water, waste gas; Corresponding treatment facility need be set; These treatment technologies have often caused the mummification cost of mud too high, can't satisfy the requirement of economy, and practical applications is very limited.
Along with people's is increasingly high to environmental requirement, mud is carried out " minimizing, innoxious, resource " handle, and final the realization fully utilizes, and is the unique channel of science Treating Municipal Sewage treatment plant mud.
Summary of the invention
The present invention be directed to the limitation of present method for sludge treatment; A kind of sludge drying and incineration system and processing method thereof of burning based on the refuse furnace grate furnace is provided; To reach the purpose of mud " minimizing, innoxious, resource ", reduced the processing cost of mud simultaneously.
For realizing above-mentioned purpose, solution of the present invention is:
A kind of sludge drying and incineration system that burns based on the refuse furnace grate furnace, this system comprises linear successively sludge conditioning press filtration mummification unit, broken supply unit, burning electricity generation unit and the gas cleaning unit that connects; Wherein:
Sludge conditioning press filtration mummification unit comprises preposition feed bin, sludge conditioning pond, mud conveying worm, mud screw pump, two barrier film vacuum press filter, air compressor machine, vacuum condensation system; Preposition feed bin is connected with the sludge conditioning pond through the mud conveying worm, and the sludge conditioning pond connects two barrier film vacuum press filter through pipeline, mud screw pump, and air compressor machine and vacuum condensation system also are connected in two barrier film vacuum press filter simultaneously;
Broken supply unit comprises disintegrating machine, belt conveyor and conveying worm; Disintegrating machine is connected with above-mentioned pair of barrier film vacuum press filter through conveyance conduit, and conveying worm is connected with disintegrating machine through belt conveyor;
The burning electricity generation unit comprises grate-type incinerator, steam turbine and generator, and the three is linear successively to be connected;
The gas cleaning unit comprises linear successively lime silo, lime pump, reaction tower, active carbon storehouse and the sack cleaner that connects.
The sack cleaner of said gas cleaning unit further connects air-introduced machine, chimney.
Grate-type incinerator in the said burning electricity generation unit is a two-period form waste incineration fire grate, the mode that this fire grate takes backstepping fire grate and forwards fire grate to combine.
A kind of sludge drying and incinerating treatment method employing that burns based on the refuse furnace grate furnace, concrete steps are:
1) be that 80% mud is discharged into preposition feed bin with moisture content, the mud conveying worm of preposition feed bin bottom is at the uniform velocity quantitatively sent mud into conditioner, when mud gets into conditioner; Dilution water is added conditioner; When mud reaches high spacing liquid level, stop into mud, stirring and evenly mixing; The mud of conditioned moisture content 90% is sent into two barrier film vacuum press filter through the mud screw pump and is carried out filter-press dehydration; And vacuumize dehydration and drying through Steam Heating;
2) dewatered sludge is after crusher in crushing, as fire grate burning boiler fuel;
3) through belt conveyor and conveying worm dewatered sludge is sent in the garbage burning boiler charging aperture; Dewatered sludge gets into the grate-type burning boiler with house refuse and carries out burning disposal; Produce high temperature and high pressure steam, the pushing turbine generating is to reach energy-conservation and purpose UTILIZATION OF VESIDUAL HEAT IN;
4) pernicious gas that produces after the sludge incineration can be handled through the smoke processing system of waste incineration and generating electricity unit with burning electricity generation unit flue gas, thereby makes the fume emission index reach environmental requirement;
5) sludge press filtration liquid gets into filtrating sedimentation basin precipitation process; Supernatant is used for the dilution of mud; And recycle as filter cloth washing water; The waste water that the waste heat gas of sludge drying produces after vacuumizing condensation gets into sewage disposal system and handles the back qualified discharge, and waste gas gets into the garbage pool of refuse furnace grate furnace CIU;
6) mix with rubbish behind the sludge drying and be sent to landfill yard behind the flyash curing that burn to produce and carry out landfill, slag then can be used as the raw material of producing building material.
The dilution water of said step 1) and mud are pressed the 1:1 part by weight and are added conditioner, make moisture percentage in sewage sludge adjust to 90% by 80% of charging, stir 25～35 minutes, accomplish sludge conditioning.
The preposition feed bin of mud in the said step 1), conditioner, two barrier film vacuum press filter adopt closed system, send into the incinerator pyrolysis to eliminate by the stink that blower fan produces mud.
Utilize the waste hot steam of waste incineration and generating electricity unit in the said step 1), in the process of filter-press dehydration, feed 1-2 kg/cm
2Pressure, temperature are that 110 ℃～120 ℃ waste hot steam adds heat drying to mud and vacuumizes, and reach below 30% through the mud moisture content of the cake behind the 4h dehydration and drying, guarantee the calorific value after dewatered sludge is gone into stove.
The interior temperature of incinerator is controlled at 850～1050 ℃ in the said step 3), the generation of control dioxin.
After adopting such scheme, system of the present invention compares with traditional sludge treatment technique and has the following advantages:
(1) minimizing degree is high: the residue that the present invention obtains at last is to burn ash content, and wet mud per ton only produces 0.26 ton of ash content at last through conditioning, dehydration, mummification, fragmentation and burning, makes mud minimizing greatly.
(2) practice thrift a large amount of landfills soil and energy consumption: mud is through conditioning; Transportation performance improves greatly; System's stable and reliable operation; Dewatered sludge is pulverized the back and in grate furnace, is carried out burning disposal with domestic waste, and the mud contained energy is reduced the cost of Treatment of Sludge greatly by fully recycle.
(3) handle thoroughly: conditioning, dehydration and drying and broken back are burned the most thorough to the processing of mud, can make the whole carbonizations of organic matter, pathogen kill, and the waste gas that produces in the processing procedure, waste water, waste residue have also obtained rational treatment and disposal or utilization.
(4) practice thrift construction cost: native system is sludge conditioning and sludge drying and the burning processing system that is based upon on the garbage incinerating power plant basis; Supply grate incinerator to burn after the sludge conditioning press filtration mummification; The waste gas that produces in the burning process, flying dust, slag etc. can be handled through the existing treatment system of garbage incinerating power plant, to practice thrift construction cost.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Among the figure:
Preposition feed bin 1 conveying worm 2 sludge conditioning ponds 3
4 pairs of barrier film vacuum press filter of mud screw pump, 5 air compressor machines 6
Vacuum condensation system 7 sedimentation basins, 8 disintegrating machines 9
The specific embodiment
Cooperate shown in Figure 1ly, the present invention has disclosed a kind of sludge drying and incineration system and processing method thereof of burning based on the refuse furnace grate furnace
The process equipment that the inventive method adopts can be divided into four processing units: sludge conditioning press filtration mummification unit I, broken supply unit II, burning electricity generation unit III, gas cleaning unit IV, and shown in each frame of broken lines among Fig. 1.
The equipment of each unit and technical process combined process flow chart 1 are explained as follows respectively:
(1) sludge conditioning press filtration mummification unit I: this unit main body is sludge conditioning pond 3 and two barrier film vacuum press filter 5;
Moisture content is to be discharged into preposition feed bin 1 after 80% mud enters factory; The conveying worm 2 of preposition feed bin 1 bottom is at the uniform velocity quantitatively sent mud into sludge conditioning pond 3, when mud gets into sludge conditioning pond 3, dilution water and mud is pressed 1:1 part by weight adding sludge conditioning pond 3; When mud reaches high spacing liquid level; Stop into mud, stirred 25～35 minutes, sludge conditioning finishes.
The mud of conditioned moisture content 90% gets into two barrier film vacuum press filter 5 through mud screw pump 4 and carries out dehydration and drying; By air compressor machine 6 press filtration air pressure is provided; By steam turbine 13 steam source is provided, utilizes the waste hot steam of waste incineration and generating electricity unit, in the process of filter-press dehydration, feed 1-2 kg/cm
2Pressure, temperature are 110 ℃～120 ℃ waste hot steam mummification and vacuumize, and below 30%, guarantee the calorific value after dewatered sludge is gone into stove through the mud moisture content of the cake behind the 4h dehydration and drying.Pressing filtering liquid gets into filtrating sedimentation basin 8 precipitation process; Supernatant is used for the dilution of mud; And recycle as filter cloth washing water, the waste gas condensation that vacuum condensation system 7 extracts out, condensation waste water gets into sewage disposal system and handles the back qualified discharge; Waste gas gets into the garbage pool of refuse furnace grate furnace CIU, gets into broken supply unit II through the mud after the mummification.
(2) broken supply unit II: this unit main body is disintegrating machine 9, belt conveyor 10, conveying worm 11.
Dewatered sludge is sent into conveying worm 11 through belt conveyor 10 again and is quantitatively carried, as the fuel of grate-type burning boiler 12 through after disintegrating machine 9 fragmentations.
(3) burning electricity generation unit III: this unit main body is grate furnace burning boiler 12, steam turbine 13 and generator 14.
Through conveying worm 11 dewatered sludge is quantitatively sent in garbage burning boiler 12 charging apertures, dewatered sludge gets into grate-type burning boiler 12 burning disposal with house refuse, and burning boiler 12 degree are controlled at 850～1050 ℃, the generation of control dioxin; Burn and produce high temperature and high pressure steam; Pushing turbine 13 rotates; Drive generator 14 generatings, burn the waste heat that produces and all be used for generating, make the abundant recycle of the energy behind the sludge drying; With low energy consumption, implemented with low cost the municipal sludge processing, and reach the requirement of " minimizing, innoxious, resource ".Be sent to landfill yard behind the flyash curing that dewatered sludge and rubbish produce after mixing and burning and carry out landfill, slag then can be used as the raw material of producing building material.
(4) gas cleaning unit IV: this unit main body is reaction tower 17, active carbon storehouse 18 and sack cleaner 19.
The high-temperature flue gas that the mud mud cake burns the back generation contains pollutants such as more sour gas and heavy metal; Quick lime is dropped into lime silo 15 process lime slurry; With lime pump 16 lime slurry is sent in the reaction tower 17; And spray downwards, with the reverse abundant haptoreaction of high-temperature flue gas, remove acidic materials.Again active carbon is entered in the system in active carbon storehouse 18, be adsorbed on sack cleaner 19 surfaces, remove pollutants such as heavy metal and dioxin.The tail gas of handling after up to standard is introduced chimneys 21 by air-introduced machine 20, enters atmosphere again.
In a word, the invention provides a kind of method of efficient processing municipal sludge, through relying on the waste incineration and generating electricity system,, thereby have certain economic property for the thorough treatment and disposal of mud provides the necessary processing system.And what in native system, adopt is grate incinerator, can satisfy the abundant burning of mud after mummification, control load and fire box temperature effectively.
Claims (8)
1. sludge drying and incineration system that burns based on the refuse furnace grate furnace, it is characterized in that: this system comprises linear successively sludge conditioning press filtration mummification unit, broken supply unit, burning electricity generation unit and the gas cleaning unit that connects; Wherein, sludge conditioning press filtration mummification unit comprises preposition feed bin, sludge conditioning pond, mud conveying worm, mud screw pump, two barrier film vacuum press filter, air compressor machine, vacuum condensation system; Preposition feed bin is connected with the sludge conditioning pond through the mud conveying worm, and the sludge conditioning pond connects two barrier film vacuum press filter through pipeline, mud screw pump, and air compressor machine and vacuum condensation system also are connected in two barrier film vacuum press filter simultaneously;
Broken supply unit comprises disintegrating machine, belt conveyor and conveying worm; Disintegrating machine is connected with above-mentioned pair of barrier film vacuum press filter through conveyance conduit, and conveying worm is connected with disintegrating machine through belt conveyor;
The burning electricity generation unit comprises grate-type incinerator, steam turbine and generator, and the three is linear successively to be connected;
The gas cleaning unit comprises linear successively lime silo, lime pump, reaction tower, active carbon storehouse and the sack cleaner that connects.
2. the sludge drying and incineration system that burns based on the refuse furnace grate furnace as claimed in claim 1, it is characterized in that: the sack cleaner of gas cleaning unit further connects air-introduced machine, chimney.
3. the sludge drying and incineration system that burns based on the refuse furnace grate furnace as claimed in claim 1, it is characterized in that: the grate-type incinerator in the burning electricity generation unit is a two-period form waste incineration fire grate, the mode that this fire grate takes backstepping fire grate and forwards fire grate to combine.
4. sludge drying and incinerating treatment method employing that burns based on the refuse furnace grate furnace, concrete steps are:
1) be that 80% mud is discharged into preposition feed bin with moisture content, the mud conveying worm of preposition feed bin bottom is at the uniform velocity quantitatively sent mud into conditioner, when mud gets into conditioner; Dilution water is added conditioner; When mud reaches high spacing liquid level, stop into mud, stirring and evenly mixing; The mud of conditioned moisture content 90% is sent into two barrier film vacuum press filter through the mud screw pump and is carried out filter-press dehydration; And through Steam Heating and vacuumize dehydration and drying;
2) dewatered sludge is after crusher in crushing, as fire grate burning boiler fuel;
3) through belt conveyor and conveying worm dewatered sludge is sent in the garbage burning boiler charging aperture; Dewatered sludge gets into the grate-type burning boiler with house refuse and carries out burning disposal; Produce high temperature and high pressure steam, the pushing turbine generating is to reach energy-conservation and purpose UTILIZATION OF VESIDUAL HEAT IN;
4) pernicious gas that produces after the sludge incineration can be handled through the smoke processing system of waste incineration and generating electricity unit with burning electricity generation unit flue gas, thereby makes the fume emission index reach environmental requirement;
5) sludge press filtration liquid gets into filtrating sedimentation basin precipitation process; Supernatant is used for the dilution of mud; And recycle as filter cloth washing water; The waste water that the waste heat gas of sludge drying produces after vacuumizing condensation gets into sewage disposal system and handles the back qualified discharge, and waste gas gets into the garbage pool of refuse furnace grate furnace CIU;
6) mix with rubbish behind the sludge drying and be sent to landfill yard behind the flyash curing that burn to produce and carry out landfill, slag then can be used as the raw material of producing building material.
5. the sludge drying and incinerating treatment method employing that burns based on the refuse furnace grate furnace as claimed in claim 4; It is characterized in that: the dilution water of said step 1) and mud are pressed the 1:1 part by weight and are added conditioner; Make moisture percentage in sewage sludge adjust to 90% by 80% of charging; Stirred 25～35 minutes, and accomplished sludge conditioning.
6. the sludge drying and incinerating treatment method employing that burns based on the refuse furnace grate furnace as claimed in claim 4; It is characterized in that: the preposition feed bin of the mud in the said step 1), conditioner, two barrier film vacuum press filter adopt closed system, send into the incinerator pyrolysis to eliminate by the stink that blower fan produces mud.
7. the sludge drying and incinerating treatment method employing that burns based on the refuse furnace grate furnace as claimed in claim 4 is characterized in that: utilize the waste hot steam of waste incineration and generating electricity unit in the said step 1), in the process of filter-press dehydration, feed 1-2 kg/cm
2Pressure, temperature are that 110 ℃～120 ℃ waste hot steam adds heat drying to mud and vacuumizes, and reach below 30% through the mud moisture content of the cake behind the 4h dehydration and drying, guarantee the calorific value after dewatered sludge is gone into stove.
8. the sludge drying and incinerating treatment method employing that burns based on the refuse furnace grate furnace as claimed in claim 4 is characterized in that: the interior temperature of incinerator is controlled at 850～1050 ℃ in the said step 3), the generation of control dioxin.
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