LU503804B1 - A fuel utilization method of flue gas drying sludge - Google Patents
A fuel utilization method of flue gas drying sludge Download PDFInfo
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- LU503804B1 LU503804B1 LU503804A LU503804A LU503804B1 LU 503804 B1 LU503804 B1 LU 503804B1 LU 503804 A LU503804 A LU 503804A LU 503804 A LU503804 A LU 503804A LU 503804 B1 LU503804 B1 LU 503804B1
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- sludge
- flue gas
- fuel utilization
- utilization method
- drying
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- 239000010802 sludge Substances 0.000 title claims abstract description 170
- 238000001035 drying Methods 0.000 title claims abstract description 101
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 239000003546 flue gas Substances 0.000 title claims abstract description 87
- 239000000446 fuel Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000000889 atomisation Methods 0.000 claims abstract description 66
- 238000000227 grinding Methods 0.000 claims abstract description 54
- 239000003245 coal Substances 0.000 claims abstract description 49
- 239000002918 waste heat Substances 0.000 claims abstract description 35
- 239000000428 dust Substances 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 6
- 239000010865 sewage Substances 0.000 description 5
- 230000005514 two-phase flow Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 drying tower 5 Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
-
- 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
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/08—Drying or removing water
-
- 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
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/18—Spraying or sprinkling
-
- 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
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/24—Mixing, stirring of fuel components
-
- 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
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/28—Cutting, disintegrating, shredding or grinding
-
- 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)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The present invention relates to the technical field of sludge treatment, it discloses a fuel utilization method of flue gas drying sludge, including the following steps: wet sludge conveying and atomization; heat exchange between waste heat flue gas and wet sludge; fuel utilization of sludge. The present invention has a simple, practical process and significant energy saving effect, which can effectively realize the fuel utilization of sludge; at the same time, the dry sludge is directly into the coal grinding machine, it can reduce the pollution of the plant environment and realize the clean utilization of sludge, the present invention has the potential application prospect of scale industry.
Description
A fuel utilization method of flue gas drying sludge
The present invention relates to the technical field of sludge treatment, especially relates to a fuel utilization method of flue gas drying sludge.
Background technology
Due to the rapid growth of urban population and the rapid development of industrialization, a large amount of urban domestic sewage and industrial wastewater has been produced, and sludge as a subsidiary product of a sewage treatment plants, its output also increases year by year, which increases the burden of sludge treatment in sewage treatment plants, at the same time, there is great pollution and destruction to the ecological environment on which human beings depend. Sludge has the features of the high moisture content, fine particles, small specific gravity, large volume and other difficult to treat, and the sludge contains a lot of organic residues, bacterial bacteria, heavy metals, inorganic particles, colloids, etc, which brings secondary pollution and other problems to the treatment of the sludge. Therefore, the development of new sludge treatment technology, to realize the reduction, harmlessness, resource utilization of sludge treatment has become an important research direction for the development of low-carbon economy.
At present, sludge heat treatment utilization is one of the more mature technical processes in various sludge disposal methods, which can reach reduction, harmlessness, stabilization of sludge, and it can use its low heat value. But the pre-drying treatment of sludge needs to consume a lot of heat, and will produce harmful gases, residues and other secondary pollution, resulting in high costs, high energy consumption, secondary pollution is difficult to control and other problems. Therefore, how to save energy, effective and clean to realize the resource utilization of high moisture content sludge is very important.
The purpose of the present invention is to overcome the shortcomings of existing technology, it provides a fuel utilization method of flue gas drying sludge, to use the remaining heat of flue gas to dry the sludge, and the dry sludge directly into the grinding device grinding, to furnace combustion, to realize the resource recovery and clean utilization of sludge.
The technical scheme adopted in the present invention is: a fuel utilization method of flue gas drying sludge, it includes the following steps: LUS03804 (1) Wet sludge conveying and atomization: the wet sludge is conveyed to the drying tower with an atomization nozzle, the atomization nozzle is atomized by compressed air to form of sludge droplets; (2) Heat exchange between waste heat flue gas and wet sludge: the waste heat flue gas enters the drying tower from the bottom to top of the drying tower, the sludge droplets fall from the top to the bottom of the drying tower, the waste heat flue gas and the sludge droplets form a counter current in the drying tower for heat exchange; (3) Fuel utilization method of sludge: the dry sludge obtained after heat exchange is conveyed to the coal grinding device, it is mixed with the original coal and grinding the powder into the furnace for combustion.
Preferably, in the above fuel utilization method of flue gas drying sludge, the wet sludge is conveyed by screw pump from the wet sludge silo to the atomization nozzle in step 1.
Preferably, in the above fuel utilization method of flue gas drying sludge, the atomization nozzle is a two-phase atomization nozzle.
Preferably, in the above fuel utilization method of flue gas drying sludge, the external of the drying tower is disposed on an air tank, the air tank is connected to the atomization nozzle for providing compressed air to the atomization nozzle.
Preferably, in the above fuel utilization method of flue gas drying sludge, the drying tower is disposed on a spray tray, the spray tray is located on the bottom of the atomization nozzle, and the spray tray is provided with a plurality of holes, the waste heat flue gas is discharged upward through the small hole, the sludge droplets fall down through the small hole to the bottom of the drying tower.
Preferably, in the above fuel utilization method of flue gas drying sludge, the atomization pressure is 5-7bar in step (1) ; the particle size of the sludge droplet is 2-4 mm.
Preferably, in the above fuel utilization method of flue gas drying sludge, the waste heat flue gas is treated by electrostatic dust collector before entering the drying tower in step (2).
Preferably, in the above fuel utilization method of flue gas drying sludge, the waste heat flue gas is taken from the boiler air pre-heater inlet in step (2), and the temperature of the drying tower is 200~280°C.
Preferably, in the above fuel utilization method of flue gas drying sludge, the coal grinding device includes an inertial flow transfer and coal grinding machine in step (3), the sludge receiving unit is conveyed by pneumatic conveying pump to the inertial flow transfer and then into the grinding powder of the coal grinding machine.
Preferably, in the above fuel utilization method of flue gas drying sludge, it also includé$/>03804 the step (4), the flue gas is discharged from the top of the drying tower and enters the dust removal device for treatment.
Preferably, in the above fuel utilization method of flue gas drying sludge, the dust removal device is a bag filter.
The present invention provides a fuel utilization method of flue gas drying sludge, the beneficial effect compared to existing technologies are: (1) Wet sludge and compressed air are fully atomized into small particle size droplets in the atomization nozzle , and the heat transfer and mass transfer are carried out with the waste heat flue gas flowing upstream; at the same time, the porous spray tray arranged under the atomization nozzle increases the contact time between the flue gas and sludge droplets, which makes the heat exchange effect more remarkable, the dry sludge falls into the sludge receiving device under the action of gravity, the pneumatic conveying pump is directly into the grinding powder of the coal grinding machine, and sends to the furnace combustion, which can significantly improve the factory environment; (2) The fuel utilization method of flue gas drying sludge of the present invention involves a simple and practical process, with significant energy-saving effect, which can effectively realize the resource and clean utilization of sludge, and has the potential application prospect of scale industry.
Description of attached drawings
Fig 1 is a schematic diagram of the flowchart of a flue gas drying sludge device in an example of the present invention.
In Fig: 1. Wet sludge silo; 2. Screw pump; 3. Atomization nozzle 4. Spray tray; 5. Drying tower; 6.
Electrostatic dust collector; 7. Sludge receiving unit; 8. Pneumatic conveying pump; 9. Coal grinding machine 10. Inertial flow transfer 11. Original silo; 12. Air tank;13. Dust removal device; 14. Atomization unit ; 15. Heat exchange unit.
Specific embodiments
The following is a further detailed description of the specific example of the invention, in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, and they cannot be used to limit the scope of the present invention.
In the description of the present application, it should be understood that the orientation or 503804 position relationship indicated by the terms “center”, “up”, “down”, “front”, “back” “left ”, “right”, “vertical”, “horizontal”, “top ”, “bottom”, “inside”, “outside” and so on is based on the orientation or position relationship shown in the drawings, and are used only to facilitate and simplify the description of the present application, they aren’t to indicate or imply that the device or the element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation of the present application.
The terms "first" and "second" is used only for descriptive purposes, and they cannot be understood as indicating or implying the relative importance or implicitly indicating the number of technical features indicated. Thus, limited to the "first" and "second” features can explicitly or implicitly include one or more of these features. In the description of this application, unless otherwise stated, "multiple" means two or more.
In the description of the present application, it is necessary to state that unless otherwise expressly specified and qualified, the terms “installation”, “adjacent”, “connection” should be understood in a broad sense, for example, it can be a fixed connection, a removable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly through an intermediate medium, or it can be the internal connection of two elements. For these general technicians in this field, the specific meaning of the above terms in this application can be understood on a case-by-case basis.
In view of the current high coal prices, in particular, the price of thermal coal in electric power plants has doubled several times in the past two years, the fuel costs of the thermal power industry account for about 70% of operating costs, at present, the thermal power industry faces serious losses, so many power plants choose to burn low heat value (about 3500kcal/kg) high moisture content (30% — 40%) of coal species to reduce fuel costs.
In view of this, the present invention uses the waste heat flue gas of a boiler to dry sludge with high moisture content and uses the sludge to fuel, which can realize the resource utilization of the sludge, and at the same time can effectively reduce the fuel cost of the thermal power industry.
Refer to Fig 1, an example of the present invention discloses a fuel utilization method of flue gas drying sludge, it includes the following steps: (1) Wet sludge conveying and atomization: the wet sludge is conveyed to the drying tower 5 with the atomization nozzle 3, the atomization nozzle is atomized by compressed air in atomization nozzle 3 to form sludge droplets with a particle size of 2-4mm; LU503804
Specifically, wet sludge 1s conveyed by screw pump 2 from wet sludge silo 1 to atomization nozzle 3, the atomization nozzle 3 is a gas-liquid two-phase flow atomization nozzle; (2) Heat exchange between waste heat flue gas and wet sludge: the waste heat flue gas 5 enters the drying tower from the bottom to top of the drying tower 5, the sludge droplets fall from the top to the bottom of the drying tower 5, the waste heat flue gas and the sludge droplets form a counter current in the drying tower 5 for heat exchange; (3) Fuel utilization method of sludge: the dry sludge obtained after heat exchange is conveyed to the coal grinding device, it is mixed with the original coal and grinding the powder into the furnace for combustion;
Specifically, the coal grinding device includes an inertial flow transfer 10 and coal grinding machine 9 in step (3), the sludge receiving unit is conveyed by pneumatic conveying pump 8 to the inertial flow transfer 10 and then into the grinding powder of the coal grinding machine 9.
In some examples of the present invention, the external of the drying tower 5 is disposed on an air tank 12, the air tank 12 is connected to the atomization nozzle 3 for providing compressed air to the atomization nozzle 3.
In some examples of the present invention, the drying tower 5 is disposed on a spray tray 4, the spray tray 4 is located on the bottom of the atomization nozzle 3, and the spray tray 4 is provided with a plurality of holes, the waste heat flue gas is discharged upward through the small hole, the sludge droplets fall down through the small hole to the bottom of the drying tower 5.
In some examples of the present invention, the waste heat flue gas is treated by electrostatic dust collector 6 before entering the drying tower 5 in step (2).
In some examples of the present invention, it also includes the step (4), the flue gas is discharged from the top of the drying tower 5 and enters the dust removal device 13 for treatment, the dust removal device 13 is a bag filter.
Correspondingly, the fuel utilization method of the above-mentioned flue gas drying sludge is realized by flue gas drying sludge device.
This example also provides a fuel utilization method of flue gas drying sludge, including drying tower 5, flue gas conveying device and coal grinding device.
Including the drying tower is disposed on the atomization unit 14, the heat exchange unit 15 and the sludge receiving unit 7 in turn from top to bottom.
In some examples of the present invention, the atomization unit 14 is disposed on the atomization nozzle 3, the atomization nozzle 3 is fixed on the top of the drying tower 5, and the atomization nozzle 3 is connected to the air tank 12, which is used to introduce compressed air into the atomization nozzle 3, the wet sludge entering the drying tower 5 is atomized into sludge droplets; LU503804
Specifically, the atomization nozzle 3 is a gas-liquid two-phase flow atomization nozzle.
The bottom of the atomization nozzle 3 is disposed on the spray tray 4 for separating the atomization unit 14 and the heat exchange unit 15; and the spray tray 4 is disposed on a number of small holes for the upward discharge of waste heat flue gas and the fall of sludge droplets, at the same time, the spray tray 4 will also undertake part of the sludge droplets, it increases the contact time between the flue gas and the sludge droplets, and improves the drying efficiency of the wet sludge.
In some examples of the present invention, the bottom side of the heat exchange unit 15 is provided with a flue gas intake, the heat exchange unit 15 is connected with the flue gas conveying device through the flue gas inlet to enter the flue gas enter the drying tower 5, and the sludge droplets and waste heat flue gas are exchanged heat in the heat exchange unit 15.
In some embodiments of the present invention, the flue gas conveying device includes an electrostatic dust collector 6, and the waste heat flue gas is processed by the electrostatic dust collector 6 and conveyed to the drying tower 5 through a pipeline for heat exchange.
Specifically, the source of waste heat flue gas can be in equipment that produces waste heat flue gas such as denitrification reactors, which can be selected and determined according to the actual situation in the factory.
In some examples of the present invention, the sludge receiving unit 7 is located at the bottom of the drying tower 5 in a funnel shape and is used to collect drying sludge falling by gravity and after heat exchange; the bottom of the sludge receiving unit 7 is provided with a sludge outlet, and the sludge outlet is connected to the coal grinding device, and the drying sludge is conveyed to the coal grinding device through the pneumatic conveying pump 8.
In some examples of the present invention, the top of the drying tower 5 is disposed on the flue gas outlet, and the flue gas outlet is connected to the dust removal device 13, and the flue gas after heat exchange passes through the small hole of the spray tray 4, and the flue gas outlet to the dust removal device 13 for subsequent treatment.
Specifically, the dust removal device 13 can be a bag filter, which can be selected and replaced according to the actual situation.
In some examples of the present invention, the coal grinding device includes the original silo 11, the inertial flow transfer 10 and a coal mill 9, the raw coal in the raw coal bunker 11 enters the coal grinding machine 9 through the inertial flow transfer 10, at the same time, the sludge receiving unit 7 conveys the dry sludge to the falling inertial flow transfer 10 through the pneumatic conveyor pump 8, and then enters the coal grinding machine 9 mixed with the original coal grinding powder and sends it to the furnace for combustion, which can effectively avoid the pollution of the sludge odor and significantly improve the surrounding environment. LU503804
Example 1:
This present example adopts the activated sludge of the sewage treatment plant as raw material, the moisture content of activated sludge is 99%, and the heat value of dry base is 3000kcal/kg.
A fuel utilization method of flue gas drying sludge, it includes the following steps: (1) Wet sludge conveying and atomization: sewage treatment plant activated sludge conveyed to drying tower 5 with atomization burner 3, in atomization burner 3, the compressed air is atomized, the sludge droplets with a particle size of about 2 ~ 4mm, including the drying tower temperature is 280 ° C, the atomizing air pressure is 5 ~ 7bar;
Specifically, wet sludge is conveyed by screw pump 2 from wet sludge silo 1 to atomization burner 3, the atomization burner 3 is a gas-liquid two-phase flow atomization burner; (2) Heat exchange between waste heat flue gas and wet sludge: the waste heat flue gas enters the drying tower 5 from the bottom to top of the drying tower, the sludge droplets fall from the top to the bottom of the drying tower 5, the waste heat flue gas and the sludge droplets form a counter current in the drying tower 5 for heat exchange; (3) Fuel utilization method of sludge: the dry sludge obtained after heat exchange (water content 30%) is conveyed to the coal grinding device, it is mixed with the original coal and grinding the powder into the furnace for combustion;
Specifically, the coal grinding device includes an inertial flow transfer 10 and coal grinding machine 9, the sludge receiving unit is conveyed by pneumatic conveying pump 8 to the inertial flow transfer 10 and then into the grinding powder of the coal grinding machine 9.
Example 2:
This present example adopts the activated sludge of the paper industry as raw material, the moisture content of activated sludge is 95%, and the heat value of dry base is 3500kcal/kg.
A fuel utilization method of flue gas drying sludge, it includes the following steps: (1) Wet sludge conveying and atomization: the activated sludge in the paper industry is conveyed to the drying tower 5 with the atomization nozzle 3, which is atomized by compressed air in the atomization nozzle 3 to form sludge droplets with a particle size of about 2~4mm, including the drying tower temperature is 250 °C and the atomized air pressure is 5-7bar;
Specifically, wet sludge is conveyed by screw pump 2 from wet sludge silo 1 to atomization nozzle 3, the atomization nozzle 3 is a gas-liquid two-phase flow atomization burner; (2) Heat exchange between waste heat flue gas and wet sludge: the waste heat flue gas enters the drying tower 5 from the bottom to top of the drying tower, the sludge droplets fall from the top to the bottom of the drying tower 5, the waste heat flue gas and the sludge droplets form a counter current in the drying tower 5 for heat exchange; LU503804 (3) Fuel utilization method of sludge: the dry sludge obtained after heat exchange (water content 26%) is conveyed to the coal grinding device, it is mixed with the original coal and grinding the powder into the furnace for combustion;
Specifically, the coal grinding device includes an inertial flow transfer 10 and coal grinding machine 9, the sludge receiving unit is conveyed by pneumatic conveying pump 8 to the inertial flow transfer 10 and then into the grinding powder of the coal grinding machine 9.
Example 3:
This present example adopts the activated sludge of the petrochemical industry as raw material, the moisture content of activated sludge is 90%, and the heat value of dry base is 4800kcal/kg.
A fuel utilization method of flue gas drying sludge, it includes the following steps: (1) Wet sludge conveying and atomization: the activated sludge in the petrochemical industry is conveyed to the drying tower 5 with atomization nozzle 3, which is atomized by compressed air in the atomization nozzle 3 to form sludge droplets with a particle size of about 2~4mm, including the drying tower temperature is 200 °C and the atomizing air pressure is 5S—Tbar;
Specifically, wet sludge 1s conveyed by screw pump 2 from wet sludge silo 1 to atomization nozzle 3, the atomization nozzle 3 is a gas-liquid two-phase flow atomization burner; (2) Heat exchange between waste heat flue gas and wet sludge: the waste heat flue gas enters the drying tower 5 from the bottom to top of the drying tower, the sludge droplets fall from the top to the bottom of the drying tower 5, the waste heat flue gas and the sludge droplets form a counter current in the drying tower 5 for heat exchange; (3) Fuel utilization method of sludge: the dry sludge obtained after heat exchange (water content 23%) is conveyed to the coal grinding device, it is mixed with the original coal and grinding the powder into the furnace for combustion;
Specifically, the coal grinding device includes an inertial flow transfer 10 and coal grinding machine 9, the sludge receiving unit is conveyed by pneumatic conveying pump 8 to the inertial flow transfer 10 and then into the grinding powder of the coal grinding machine 9.
In summary, the example of the present invention, after the waste heat flue gas is introduced from the outlet of the denitrification reactor through the electrostatic dust collector, and it enters the drying tower from bottom to top to dry the wet sludge; the wet sludge is conveyed to the atomization nozzle by the screw pump, and is atomized by compressed air in the atomization nozzle; under the atomization nozzle, a layer of porous spray tray is set up to increase the gas-liquid contact time and evenly distribute the airflow; the drying sludge falls into the sludge receiving unit under the action of gravity, the pneumatic conveying pump is directly into th&/503804 grinding powder of the coal grinding machine, then enters the grinding powder of the coal grinding machine, and is sent to the furnace for combustion. The present invention has a simple, practical process and significant energy saving effect, which can effectively realize the fuel utilization of sludge; at the same time, dry sludge directly into the coal grinding machine, it can reduce the pollution of the plant environment and realize the clean utilization of sludge, the present invention has the potential application prospect of scale industry.
The above is only the preferred example of the present invention, it should be noted that for these general technicians in this technical field, without departing from the technical principle of the present invention, a number of improvements and replacements can be made, and these improvements and replacements should also be considered as the scope of protection of the present invention.
Claims (10)
1. A fuel utilization method of flue gas drying sludge, its characteristics lie in that include the following steps: (1) Wet sludge conveying and atomization: the wet sludge is conveyed to the drying tower with an atomization nozzle, the atomization nozzle is atomized by compressed air to form of sludge droplets; (2) Heat exchange between waste heat flue gas and wet sludge: the waste heat flue gas enters the drying tower from the bottom to top of the drying tower, the sludge droplets fall from the top to the bottom of the drying tower, the waste heat flue gas and the sludge droplets form a counter current in the drying tower for heat exchange; (3) Fuel utilization method of sludge: the dry sludge obtained after heat exchange is conveyed to the coal grinding device, it is mixed with the original coal and grinding the powder into the furnace for combustion.
2. According to the fuel utilization method of flue gas drying sludge described in claim 1, its characteristics lie in that the wet sludge is transported by screw pump from the wet sludge silo to the atomization nozzle in step 1.
3. According to the fuel utilization method of flue gas drying sludge described in claim 1, its characteristics lie in that the atomization nozzle is a two-phase atomization nozzle.
4. According to the fuel utilization method of flue gas drying sludge described in claim 1, its characteristics lie in that the external of the drying tower is disposed on an air tank, the air tank is connected to the atomization nozzle for providing compressed air to the atomization nozzle.
5. According to the fuel utilization method of flue gas drying sludge described in claim 1, its characteristics lie in that the drying tower is disposed on a spray tray, the spray tray is located on the bottom of the atomization nozzle, and the spray tray is provided with a plurality of holes, the waste heat flue gas is discharged upward through the small hole, the sludge droplets fall down through the small hole to the bottom of the drying tower.
6. According to the fuel utilization method of flue gas drying sludge described in claim 1, its characteristics lie in that the atomization pressure is 5-7bar in step (1) ; the particle size of the sludge droplet is 2-4 mm.
7. According to the fuel utilization method of flue gas drying sludge described in claim 1, its characteristics lie in that the waste heat flue gas is treated by electrostatic dust collector before entering the drying tower in step (2).
8. According to the fuel utilization method of flue gas drying sludge described in claim 1,
its characteristics lie in that the waste heat flue gas is taken from the boiler air pre-heater inlet 503804 step (2), and the temperature of the drying tower is 200~280°C.
9. According to the fuel utilization method of flue gas drying sludge described in claim 1, its characteristics lie in that the coal grinding device includes an inertial flow transfer and coal grinding machine in step (3), the sludge receiving unit is conveyed by pneumatic conveying pump to the inertial flow transfer and then into the grinding powder of the coal grinding machine.
10. According to the fuel utilization method of flue gas drying sludge described any one of the claim 1- 9, its characteristics lie in that also includes the step (4), the flue gas is discharged from the top of the drying tower and enters the dust removal device for treatment.
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| DE4226487C1 (en) * | 1992-08-11 | 1994-01-27 | Noell Dbi Energie Entsorgung | Dewatered clarification sludge feed to disposal reactor - includes temp. pressure treatment before entry into reactor then atomisation within reactor |
| CN102211845B (en) * | 2010-04-08 | 2013-05-22 | 北京朗新明环保科技有限公司 | Sludge treatment and disposal system and method |
| CN103043879A (en) * | 2012-12-20 | 2013-04-17 | 东南大学 | Equipment and method for drying sludge with flue gas |
| CN205115263U (en) * | 2015-11-09 | 2016-03-30 | 湖北加德科技股份有限公司 | Utilize sludge drying equipment of low temperature flue gas |
| CN108083607A (en) * | 2017-11-08 | 2018-05-29 | 上海锅炉厂有限公司 | A kind of sludge drying coupling coal generating system and method |
| CN214299838U (en) * | 2021-01-18 | 2021-09-28 | 国投信开水环境投资有限公司 | Sludge treatment disposal system with combination of spray drying and pulverized coal furnace |
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