CN110551549A - Device and method for preparing sludge-biomass particle fuel rod - Google Patents
Device and method for preparing sludge-biomass particle fuel rod Download PDFInfo
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- CN110551549A CN110551549A CN201910853502.1A CN201910853502A CN110551549A CN 110551549 A CN110551549 A CN 110551549A CN 201910853502 A CN201910853502 A CN 201910853502A CN 110551549 A CN110551549 A CN 110551549A
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- sludge
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- storage bin
- fuel rod
- dry
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- 239000002028 Biomass Substances 0.000 title claims abstract description 105
- 239000000446 fuel Substances 0.000 title claims abstract description 52
- 239000002245 particle Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000010802 sludge Substances 0.000 claims abstract description 113
- 238000003860 storage Methods 0.000 claims abstract description 47
- 238000001035 drying Methods 0.000 claims abstract description 42
- 239000003755 preservative agent Substances 0.000 claims abstract description 22
- 230000002335 preservative effect Effects 0.000 claims abstract description 22
- 239000003381 stabilizer Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 238000005469 granulation Methods 0.000 claims abstract description 8
- 230000003179 granulation Effects 0.000 claims abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 31
- 239000003546 flue gas Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000002994 raw material Substances 0.000 claims description 18
- 239000008188 pellet Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 4
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims description 3
- 235000011010 calcium phosphates Nutrition 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical group O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical group [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000005550 wet granulation Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000010902 straw Substances 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
- 235000007201 Saccharum officinarum Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000005312 bioglass Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000003516 soil conditioner Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/22—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by pressing in moulds or between rollers
-
- 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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
the invention provides a preparation device of a sludge-biomass particle fuel rod, which comprises the following steps: comprises a stirring device, a sludge conveying device and a granulation drying device; the stirring device comprises a sludge-biomass storage bin, and a biomass feed inlet, a sludge feed inlet and a stabilizer and preservative feed inlet which are communicated with the inner cavity of the sludge-biomass storage bin are arranged on the sludge-biomass storage bin; the sludge-biomass storage bin is provided with a stirrer, and a screw feeder in the inner cavity of the closed semi-dry sludge storage bin is connected with the granulator; the granulator is positioned right above the porous mesh reciprocating type conveying belt; the invention also provides a preparation method of the sludge-biomass particle fuel rod, which comprises the following steps: the method of forming the particle rod by wet granulation and then drying is adopted, so that the contact area of sludge and biomass particles in the drying process is increased, the drying efficiency is greatly increased, and the energy consumption is greatly reduced. Compared with the prior device, the invention has simple structure, convenient operation and convenient and rapid maintenance.
Description
Technical Field
The invention belongs to the fields of biomass fuel technology and solid waste recycling, and particularly relates to a device and a method for preparing a sludge-biomass particle fuel rod.
Background
Biomass (bioglass) refers specifically to the collective name of all living and dead biological matter and metabolic products on earth. Compared with petroleum fuels which are widely used at present, the biomass fuel is not only a unique renewable carbon source, but also has the advantages of no net carbon emission, low sulfur content and biodegradability. In recent years, biomass energy has been focused on its characteristics such as practicality, feasibility, and versatility. The biomass energy source is wide, and sugarcane, corn, straw and some industrial organic garbage can be used as raw materials. Therefore, the preparation of such environmentally friendly renewable fuels is of great significance.
Municipal sludge is a byproduct produced in the municipal wastewater treatment process and is a complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids and the like. In recent years, the municipal sludge amount in China is huge, the yield is about 150 ten thousand tons every year, more than one half of the sludge is not effectively treated, and the sludge brings serious threat to the ecological environment. Therefore, the effective treatment of municipal sludge has become an urgent problem to be solved in today's society.
In the sludge treatment technology at the present stage, the water content of the sludge after mechanical dehydration is generally more than 60%. The sludge heat drying can further remove the water in the sludge through the heat transfer effect between the sludge and the heating medium so as to further reduce the volume of the sludge, and the water content can reach below 30 percent. The odor, pathogens, viscosity, instability and other conditions of the dried sludge are obviously improved, and the dried sludge can be used as fuel, fertilizer, soil conditioner, building materials and the like. Generally speaking, the heat drying process should be combined with waste heat utilization, and it is not suitable to separately install the heat drying process, and the methane heat energy, the waste heat of garbage and sludge incineration, the waste heat of thermal power plant or other waste heat generated in the anaerobic digestion treatment process of sludge can be fully utilized to dry wet sludge. The sludge heat drying equipment can be divided into a direct heating type, an indirect heating type and a direct/indirect combined drying type according to the contact mode of a heat medium and sludge. According to the process types, the method can be divided into five types, namely fluidized bed drying, belt type drying, blade type drying, horizontal rotating disc type drying, vertical disc type drying and the like. The fluidized bed drying technology is a new type of drying technology developed in recent years, the process is that the bulk material is placed on a pore plate, and the gas is conveyed from the lower part of the pore plate, so that the material particles move on a gas distribution plate and are in a suspension state in the gas flow, a mixed bottom layer of the material particles and the gas is generated, the material particles in the fluidized bed dryer are fully contacted with the gas in the mixed bottom layer, the heat transfer and the moisture transfer between the material and the gas are carried out, and the advantages of low emission, no environmental pollution, convenient loading and unloading, convenient transportation and the like are achieved. But has the defects of uneven airflow condition and basically complete mixing type particle movement, and causes excessive dust content. The main body of the rotary disc type dryer is composed of a rotary drum type shell and a group of rotary discs which penetrate through the center, the rotary disc group is hollow, a heat medium passes through the middle of the rotary disc group and indirectly conducts heat to sludge, water vapor formed by evaporation of water in the sludge is collected in a dome above the rotary disc and is taken out of the dryer by a small amount of ventilation, and the rotary disc type dryer has the characteristics of low oxygen content, low temperature and dust content, good safety and the like during operation. Thus, both methods are widely used in the drying process. However, the rotating disc type dryer has the problems of low drying speed, high energy consumption and the like.
accordingly, there is a need for improvements in the art.
disclosure of Invention
the invention aims to provide an efficient preparation device and method for a sludge-biomass particle fuel rod.
In order to solve the technical problem, the invention provides a preparation device of a sludge-biomass particle fuel rod, which comprises the following steps: comprises a stirring device, a sludge conveying device and a granulation drying device;
The stirring device comprises a sludge-biomass storage bin, and a biomass feed inlet, a sludge feed inlet and a stabilizer and preservative feed inlet which are communicated with the inner cavity of the sludge-biomass storage bin are arranged on the sludge-biomass storage bin; the sludge-biomass storage bin is provided with a stirrer,
The screw feeder in the inner cavity of the closed semi-dry sludge storage bin is connected with the granulator; the granulator is positioned right above the porous mesh reciprocating type conveying belt; the hot flue gas inlet is positioned right below the porous mesh reciprocating type conveying belt;
the sludge-biomass storage bin is connected with the closed semi-dry sludge storage bin through a sludge conveying device.
as an improvement of the preparation device of the sludge-biomass particle fuel rod of the invention:
the number of the porous reticular reciprocating type conveying belts is at least three, all the porous reticular reciprocating type conveying belts are sequentially arranged from top to bottom, and the arrangement mode of the porous reticular reciprocating type conveying belts is a left-right staggered mode.
As a further improvement of the preparation device of the sludge-biomass particle fuel rod of the invention:
And a filter screen is arranged on the sludge feeding hole.
as a further improvement of the preparation device of the sludge-biomass particle fuel rod of the invention:
the mesh size of the porous mesh reciprocating type conveying belt is 5-10 mm.
The invention also provides a preparation method of the sludge-biomass particle fuel rod, which comprises the following steps: the method comprises the following steps:
1) Drying the sludge until the water content is 70-80% to obtain pretreated sludge;
2) drying the biomass raw material until the water content is 10% -20%, and then crushing the biomass raw material, wherein the particle size of the crushed biomass raw material is 3-6 mm;
3) Mixing a preservative, a stabilizer, the sludge pretreated in the step 1) and the biomass raw material crushed in the step 2), and uniformly stirring to obtain semi-dry sludge-biomass particles (with the water content of 40-50%);
The mass ratio of the pretreated sludge to the crushed biomass raw materials to the preservative to the stabilizer is 48: 50: 1: 1;
4) Conveying the semi-dry sludge particles formed in the step 3) to a closed semi-dry sludge storage bin through a sludge conveying device;
5) The semi-dry sludge-biomass particles in the closed semi-dry sludge storage bin fall onto a plurality of groups of rolling rotary drums on the granulator through a screw feeder;
6) then, carrying out extrusion forming through a rotary drum of a granulator to obtain initial formed granular fuel, wherein the grain size of the granules is 10-15 mm;
7) the initial forming granular fuel falls onto the porous reticular reciprocating conveyor belt, and the initial forming granular fuel passes through the porous reticular reciprocating conveyor belt layer by layer from top to bottom; and meanwhile, hot flue gas at the temperature of 120-150 ℃ enters a closed semi-sludge storage bin from a hot flue gas inlet, and the hot flue gas passes through a porous net-shaped reciprocating type conveying belt from bottom to top to dry the initially formed granular fuel layer by layer and dry for 4.5-5.5 minutes to obtain the sludge-biomass granular fuel rod.
as an improvement of the preparation method of the sludge-biomass particle fuel rod of the invention:
The sludge used in the step is municipal sludge with the water content of about 90 percent generated in urban life or industry.
As a further improvement of the preparation method of the sludge-biomass particle fuel rod of the invention:
The preservative is ferric oxide preservative, and the stabilizer is calcium phosphate stabilizer.
The device and the method for preparing the sludge-biomass particle fuel rod have the technical advantages that:
1, a method of forming a particle rod by wet granulation and then drying is adopted, so that the contact area of sludge and biomass particles in the drying process is increased, the drying efficiency is greatly increased, and the energy consumption is greatly reduced.
2 the adoption of the porous net-shaped reciprocating conveyer belt made of iron instead of the belt conveyer belt can ensure that the hot flue gas can dry sludge-biomass particles through the pores of the conveyer belt, thereby effectively utilizing the hot flue gas and reducing the energy consumption.
3 the rotating speed of the rotary drum of the granulator, the rotating speed of the stirrer and the conveying speed of the porous mesh reciprocating conveyer belt can be adjusted according to the actual requirement of the water content of the sludge, and the granulator has good flexibility in engineering application.
4 the fuel rod is prepared by mixing the sludge and the biomass particles, so that the water content of the sludge can be quickly reduced, the heat value of sludge combustion is improved, and the scaling problem of biomass combustion is reduced.
Compared with the prior device, the invention has simple structure, convenient operation and convenient and rapid maintenance.
drawings
the following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is an overall schematic view of a sludge-biomass pellet fuel rod manufacturing apparatus according to the present invention.
fig. 2 is a schematic view of the stirring device of fig. 1.
FIG. 3 is a schematic view of the conveyor and the granulating and drying apparatus shown in FIG. 1.
Fig. 4 is a schematic view of the multi-hole shuttle conveyor belt of fig. 1.
the device comprises a stirring device 1, a biomass feeding port 1-1, a sludge feeding port 1-2, a stirrer 1-3, a biomass-sludge storage bin 1-4, a stabilizer and preservative feeding port 1-5, a sludge conveying device 2, a granulation drying device 3, a closed semi-sludge storage bin 3-1, a granulator 3-2, a cold flue gas outlet 3-3, a porous net-shaped reciprocating conveying belt 3-4, a hot flue gas inlet 3-5 and a biomass-sludge particle combustion rod outlet 3-6.
Detailed Description
the invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
example 1, a sludge-biomass pellet fuel rod manufacturing apparatus, as shown in fig. 1 to 4, includes a stirring apparatus 1, a sludge conveying apparatus 2, and a granulation drying apparatus 3.
the stirring device 1 comprises a sludge-biomass storage bin 1-4, and the sludge-biomass storage bin 1-4 is provided with a biomass feed inlet 1-1, a sludge feed inlet 1-2 and a stabilizer and preservative feed inlet 1-5 which are communicated with the inner cavity of the sludge-biomass storage bin; the stirrer 1-3 extends into an inner cavity of the sludge-biomass storage bin 1-4, a filter screen is arranged at the sludge feeding port 1-2, and the diameter of an opening of the filter screen is 5-10 mm. The rotating speed and the stirring time of the sludge-biomass stirrer 1-3 can be adjusted according to actual conditions.
The stirring device 1 is communicated with a material inlet of the granulation drying device 3 through the sludge conveying device 2.
the granulation dryer 3 comprises a closed semi-dry sludge storage bin 3-1, and a material inlet connected with the sludge-biomass mixed semi-dry matter conveyed by the sludge conveying device 2 is arranged on the closed semi-dry sludge storage bin 3-1; the lower part of the inner cavity of the semi-dry sludge storage bin 3-1 is provided with a screw feeder, the screw feeder of the semi-dry sludge storage bin 3-1 is connected with a granulator 3-2, the screw feeder conveys the semi-dry sludge in the semi-dry sludge storage bin 3-1 to the upper part of the granulator 3-2 through rotation, and the granulator 3-2 is positioned right above the porous mesh reciprocating conveyor belt 3-4. The rotary drum of the granulator 3-2 can completely cover the lower part of the closed semi-sludge storage bin 3-1, the rotating speed of the rotary drum of the granulator 3-2 is adjusted, sludge-biomass particles in the closed semi-sludge storage bin 3-1 are formed into particles of 10 mm-20 mm and then fall into the porous mesh reciprocating conveyor belt 3-4 of the porous mesh reciprocating conveyor belt made of iron, hot flue gas is used for drying the sludge-biomass particles at the same time, and then the particles fall into the porous mesh reciprocating conveyor belt 3-4 of the lower layer from the porous mesh reciprocating conveyor belt 3-4 of the upper layer in a staggered mode. The hot flue gas inlet 3-5 is positioned under the porous mesh reciprocating type conveying belt 3-4. The hot flue gas inlet 3-5 extends into the central position of the bottom of the dryer (the hot flue gas inlet 3-5 is positioned under the dryer), and the hot flue gas inlet 3-5 is arranged into an umbrella hat structure, so that the flue gas can be uniformly diffused and conveyed to the porous mesh reciprocating type conveying belt 3-4. The cold flue gas outlet 3-3 is arranged at one side of the porous mesh reciprocating type conveying belt 3-4 and used for discharging cold flue gas.
The sludge conveying device 2 is a fully-closed scraper conveyor.
The granulator 3-2 adopts a structure of a plurality of groups of rolling rotary drums, and each group of rotary drums has the same structure and a multi-head gear structure. The particle size of the particles is 10-15 mm by designing the size and density of the gear. The whole rotary drum can cover the lower part of the closed semi-dry sludge storage bin, and the number and the size of the rotary drums can be adjusted according to actual conditions. The rotation speed of the rotating drum in the granulator 3-2 can be adjusted according to actual conditions.
the porous mesh reciprocating type conveyor belt 3-4 is a multilayer porous mesh reciprocating type. The porous net reciprocating type conveyer belt 3-4 is made of iron net structure. The mesh size of the porous mesh reciprocating type conveying belt is 5-10 mm in 3-4 meshes. The running speed of the porous mesh reciprocating type conveying belt 3-4 can be adjusted according to the actual drying requirement. The number of layers of the porous reticular reciprocating type conveying belts 3-4 is adjusted according to the actual drying requirement. The position of each layer of the porous mesh reciprocating type conveyor belts 3-4 is in a left-right staggered form, the conveyor belt of the upper layer moves from left to right, the conveyor belt of the lower layer moves from right to left, and the like. In addition, the sludge at the tail end of the upper layer is dropped to the beginning of the lower layer, so that different conveying layers are slightly indented and convexly staggered. The design can prolong the retention time of the sludge in the dryer and improve the drying effect.
The sludge treatment steps are as follows:
the sludge is filtered by a filter screen through a sludge feed port 1-2 and enters a sludge-biomass storage bin 1-4; the biomass and the stabilizer preservative respectively enter a sludge-biomass storage bin 1-4 from a biomass feed inlet 1-1 and a stabilizer and preservative feed inlet 1-5; mixing the filtered sludge with biomass and a stabilizer preservative;
The sludge-biomass stirrer 1-3 is used for stirring the filtered sludge, the biomass and the stabilizer preservative to obtain a semi-dry sludge-biomass material;
The semi-dry sludge-biomass material is conveyed to a closed semi-dry sludge storage bin 3-1 through a sludge conveying device 2, the semi-dry sludge-biomass material falls from the semi-dry sludge storage bin 3-1 to a granulator 3-2 under the action of a semi-dry sludge-biomass material screw feeder, the granulator 3-2 presses and forms the semi-dry sludge-biomass mixed material into a particle rod, the particle rod falls onto a porous mesh reciprocating type conveying belt 3-4,
and drying the sludge-biomass particle fuel rod from the sludge-biomass particle fuel rod outlet 3-6 by using the hot flue gas at 120-150 ℃ entering from the hot flue gas inlet 3-5. The hot flue gas passes through the meshes of the sludge conveying layers from bottom to top, and exchanges heat with the sludge to evaporate water, thereby achieving the drying purpose.
Waste gas generated in the conveying process of the sludge conveying device 2 enters the boiler together with the dried flue gas through the pipeline for combustion.
the preparation method of the sludge-biomass particle fuel rod comprises the following steps:
1) Performing plate-and-frame filter pressing pretreatment on the sludge and drying the sludge until the water content is 70% -80% to obtain pretreated sludge;
the sludge is municipal sludge with water content of about 90% generated in urban life or industry, and is dried and pretreated in a sewage treatment plant to form pretreated sludge with water content of 70-80%, and then the pretreated sludge enters the granulation drying system.
2) and drying the biomass raw material until the water content is 10-20%, and then crushing the biomass raw material, wherein the particle size of the crushed biomass raw material is 3-6 mm.
The biomass raw material in the invention can be straw, wood chips, rice hulls, branches and the like.
3) mixing the preservative, the stabilizer, the sludge pretreated in the step 1) and the biomass raw material crushed in the step 2), and uniformly stirring to form semi-dry sludge-biomass particles with the water content of 40-50%.
the mass ratio of the sludge to the crushed biomass raw materials to the preservative to the stabilizer is 48: 50: 1: 1;
The added preservative is ferric oxide preservative, and the added stabilizer is calcium phosphate stabilizer.
4) Conveying the semi-dry sludge particles formed in the step 3) to a closed semi-dry sludge storage bin 3-1 through a sludge conveying device 2;
5) and the sludge-biomass mixed material in the closed semi-dry sludge storage bin 3-1 falls onto a plurality of groups of rolling rotary drums on the granulator 3-2 through the screw feeder.
6) and then carrying out extrusion forming through a rotary drum of the granulator 3-2 to obtain the initial formed granular fuel, wherein the grain diameter of the granules is 10-15 mm.
7) The initial forming granular fuel falls onto the porous reticular reciprocating type conveying belt 3-4, and the initial forming granular fuel passes through the porous reticular reciprocating type conveying belt 3-4 layer by layer from top to bottom; meanwhile, hot flue gas with the temperature of 120-150 ℃ enters a closed semi-sludge storage bin 3-1 from a hot flue gas inlet 3-5, the hot flue gas passes through a porous net-shaped reciprocating conveyor belt 3-4 from bottom to top, and the initially formed granular fuel is dried layer by layer in the process and is dried for 5 minutes to obtain the sludge-biomass granular fuel rod with the water content of 10-20%.
Municipal sludge with the water content of 75% and straw biomass raw materials with the water content of 15% and the particle size of 5mm are mixed, and the mass ratio of the sludge to the crushed straw to the preservative to the stabilizer is 48: 50: 1: 1, adopting a drying mode of a granulator 3-2 and four layers of porous mesh-shaped conveying belts 3-4, introducing hot flue gas at 150 ℃ from a hot flue gas inlet 3-5, and drying for 5 minutes; the average water content of the finally obtained sludge-biomass particle fuel rod is 14%.
Comparative example 1: a granulator 3-2 is omitted, and a screw feeder at the bottom of the semi-dry sludge storage bin is used for directly discharging; the rest is equivalent to the embodiment 1; the average water content of the obtained sludge-biomass particle fuel rod is 35%.
Comparative example 2: hot flue gas inlets 3-5 are eliminated, and hot flue gas is directly fed from two sides of a porous mesh reciprocating type conveying belt 3-4; the rest is equivalent to the embodiment 1; the average water content of the obtained sludge-biomass particle fuel rod is 21%.
Comparative example 3: the porous net-shaped reciprocating type conveying belt 3-4 is changed into a hole-free reciprocating type; the rest is equivalent to the embodiment 1; the average water content of the obtained sludge-biomass particle fuel rod is 32%.
Finally, it is also noted that the above-mentioned lists merely illustrate a few specific embodiments of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (7)
1. Mud-living beings pellet fuel rod preparation facilities which characterized in that: comprises a stirring device (1), a sludge conveying device (2) and a granulation drying device (3);
The stirring device (1) comprises a sludge-biomass storage bin (1-4), and a biomass feed port (1-1), a sludge feed port (1-2) and a stabilizer and preservative feed port (1-5) which are communicated with the inner cavity of the sludge-biomass storage bin (1-4) are arranged on the sludge-biomass storage bin (1-4); the sludge-biomass storage bin (1-4) is provided with a stirrer (1-3),
The screw feeder in the inner cavity of the closed semi-dry sludge storage bin (3-1) is connected with the granulator (3-2); the granulator (3-2) is positioned right above the porous mesh reciprocating type conveying belt (3-4); the hot flue gas inlet (3-5) is positioned under the porous mesh reciprocating type conveying belt (3-4);
The sludge-biomass storage bin (1-4) is connected with the closed semi-dry sludge storage bin (3-1) through a sludge conveying device (2).
2. The sludge-biomass pellet fuel rod manufacturing apparatus as set forth in claim 1, wherein:
The number of the porous reticular reciprocating conveyor belts (3-4) is at least three, all the porous reticular reciprocating conveyor belts (3-4) are sequentially arranged from top to bottom, and the arrangement mode of the porous reticular reciprocating conveyor belts (3-4) is in a left-right staggered mode.
3. the sludge-biomass pellet fuel rod manufacturing apparatus as set forth in claim 2, wherein:
and a filter screen is arranged on the sludge feeding hole (1-2).
4. The sludge-biomass pellet fuel rod manufacturing apparatus as set forth in claim 3, wherein:
the mesh size of the porous mesh reciprocating type conveying belt (3-4) is 5-10 mm.
5. The method for manufacturing a sludge-biomass pellet fuel rod using the apparatus for manufacturing a sludge-biomass pellet fuel rod as set forth in any one of claims 1 to 4, wherein: the method comprises the following steps:
1) Drying the sludge until the water content is 70-80% to obtain pretreated sludge;
2) Drying the biomass raw material until the water content is 10% -20%, and then crushing the biomass raw material, wherein the particle size of the crushed biomass raw material is 3-6 mm;
3) mixing the preservative, the stabilizer, the sludge pretreated in the step 1) and the biomass raw material crushed in the step 2), and uniformly stirring to obtain semi-dry sludge-biomass particles;
The mass ratio of the pretreated sludge to the crushed biomass raw materials to the preservative to the stabilizer is 48: 50: 1: 1;
4) conveying the semi-dry sludge particles formed in the step 3) to a closed semi-dry sludge storage bin (3-1) through a sludge conveying device (2);
5) The semi-dry sludge-biomass particles in the closed semi-dry sludge storage bin (3-1) fall onto a plurality of groups of rolling rotary drums on the granulator (3-2) through a screw feeder;
6) Then, carrying out extrusion forming through a rotary drum of a granulator (3-2) to obtain initial formed granular fuel, wherein the grain size of the granules is 10-15 mm;
7) The initial forming granular fuel falls onto the porous reticular reciprocating type conveying belt (3-4), and the initial forming granular fuel passes through the porous reticular reciprocating type conveying belt (3-4) layer by layer from top to bottom; meanwhile, hot flue gas at the temperature of 120-150 ℃ enters a closed semi-sludge storage bin (3-1) from a hot flue gas inlet (3-5), and the hot flue gas passes through a porous net-shaped reciprocating conveyor belt (3-4) from bottom to top to dry the initially formed granular fuel layer by layer and dry for 4.5-5.5 minutes to obtain the sludge-biomass granular fuel rod.
6. The method for preparing a sludge-biomass pellet fuel rod as claimed in claim 5, wherein:
The sludge used in the step 1) is municipal sludge with the water content of about 90 percent generated in urban life or industry.
7. The method for preparing a sludge-biomass pellet fuel rod as claimed in claim 6, wherein:
The preservative is ferric oxide preservative, and the stabilizer is calcium phosphate stabilizer.
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Cited By (1)
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| EP4257559A1 (en) * | 2022-04-05 | 2023-10-11 | EKO d.o.o. Krsko | A process for producing biofuel from wastewater treatment sludge |
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