CN117098828A - Solid fuel reheat steam treatment system - Google Patents
Solid fuel reheat steam treatment system Download PDFInfo
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- CN117098828A CN117098828A CN202280003276.8A CN202280003276A CN117098828A CN 117098828 A CN117098828 A CN 117098828A CN 202280003276 A CN202280003276 A CN 202280003276A CN 117098828 A CN117098828 A CN 117098828A
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- solid fuel
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- reheat steam
- supplied
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- 239000004449 solid propellant Substances 0.000 title claims abstract description 245
- 239000007788 liquid Substances 0.000 claims abstract description 92
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 239000002826 coolant Substances 0.000 claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 claims description 35
- 239000007924 injection Substances 0.000 claims description 35
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 28
- 239000012535 impurity Substances 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 14
- 238000010298 pulverizing process Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 description 40
- 238000002485 combustion reaction Methods 0.000 description 19
- 238000001035 drying Methods 0.000 description 14
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 10
- 239000002028 Biomass Substances 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000000446 fuel Substances 0.000 description 8
- 238000010248 power generation Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 5
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 5
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 5
- 239000013060 biological fluid Substances 0.000 description 5
- 239000008103 glucose Substances 0.000 description 5
- 229920005610 lignin Polymers 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002803 fossil fuel Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 238000007781 pre-processing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000003077 lignite Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002802 bituminous coal Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 239000010849 combustible waste Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- -1 i.e. Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000013469 resistive pulse sensing Methods 0.000 description 1
Classifications
-
- 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
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
-
- 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
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
-
- 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
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- 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
- C10L2290/14—Injection, e.g. in a reactor or a fuel stream during fuel production
- C10L2290/148—Injection, e.g. in a reactor or a fuel stream during fuel production of steam
-
- 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
- C10L2290/22—Impregnation or immersion of a fuel component or a fuel as a whole
-
- 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
-
- 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
- C10L2290/50—Screws or pistons for moving along solids
-
- 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
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
-
- 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
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/547—Filtration for separating fractions, components or impurities during preparation or upgrading of a fuel
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
A solid fuel reheat steam treatment system is disclosed. The solid fuel reheat steam treatment system according to the present invention includes: a pretreatment unit to which the solid fuel is supplied to inject the bio-liquid onto the solid fuel, thereby impregnating the solid fuel with the bio-liquid; a heat treatment unit to which the solid fuel impregnated with the biological liquid is supplied to heat treat the solid fuel impregnated with the biological liquid; a reheat steam supply unit for supplying reheat steam to the heat treatment unit to directly heat the solid fuel supplied into the heat treatment unit; a cooling unit to which the solid fuel heat-treated by the heat treatment unit is supplied to cool the solid fuel; and a coolant supply unit that supplies coolant to the cooling unit to cool the solid fuel supplied into the cooling unit.
Description
Technical Field
The invention relates to a solid fuel reheat steam treatment system.
Background
For example, in a thermal power plant using a solid fuel such as coal, about 180 tons/hour of coal is burned per 500MW, corresponding to about 37 tons of coal being supplied to the boiler for each pulverizer.
A 500 megawatt coal-fired power plant includes about 6 coal reservoirs of about 500 tons in capacity, 5 of which are used to normally supply coal, and the remaining 1 of which are used as coal reservoirs to store coal intended for use in emergency situations for a predetermined period of time.
In addition, a thermal power plant using coal as a fuel for power generation is designed to meet the standard power design criteria for coal, i.e., bituminous coal of 6,080kcal/Kg and low moisture content of 10% or less should be used. However, some thermal power plants use inlet coal, wherein a portion of the bituminous coal has an average moisture content of 17% or more, which reduces the combustion efficiency of the boiler.
When the calorific value of the coal used is low and the standard power combustion limit value is 5,400kcal/Kg, it is expected that the decrease in combustion efficiency results in a decrease in the amount of generated electricity and an increase in the fuel consumption. Further, when brown coal having a high moisture content (moisture 25% or more) and a low heat value is used, coal transportation by a transportation system is not smooth due to the moisture content higher than a design standard, and a decrease in efficiency of grinding coal using a pulverizer, a decrease in combustion efficiency due to partial incomplete combustion, uneven heat distribution in a boiler, and operation in an abnormal state occur. However, in a thermal power plant, the amount of lignite used is gradually increased to about 41% to 60% to reduce fuel costs, and solid fuels such as coal have been indirectly heated and dried by supplying high-pressure steam to a jacket or a pipe using a steam dryer.
However, when high-temperature hot air equal to or higher than a predetermined temperature is used for high-temperature drying of solid fuel such as coal using a steam dryer, volatile gas and fine particles are generated, and when the volatile gas and fine particles reach a combustion temperature, the volatile gas and fine particles fire and burn in the apparatus.
That is, when high-temperature drying air (oxygen concentration 21%) subjected to heat exchange is generally used, drying proceeds quickly, but the combustibles are ignited. Therefore, in order to prevent the combustible from firing, the combustible is dried using dry air having a very low temperature (60 to 80 ℃) or indirectly dried by contact with the surface of the steam pipe to prevent direct contact with high-temperature air.
However, low temperature air or indirect drying based on heat transfer requires a long time and a very large size of equipment, resulting in excessive energy consumption.
Meanwhile, recently, interest in coal as an energy source is increasing due to the continuous increase of petroleum prices and the distrust of nuclear energy stability. However, coal is a less competitive energy source in view of global warming issues, since coal produces the most carbon dioxide in fossil fuels. Therefore, development and utilization of renewable energy as an energy source are one of global subjects at present, and renewable energy is an energy source capable of coping with global warming and climate change because it reduces emission of carbon dioxide as compared with fossil fuels such as petroleum and coal.
Renewable energy sources (e.g., solar or wind energy) for power generation or heating are limited in development and utilization due to the difference in power generation costs as compared to fossil fuels, but renewable energy combination standards (RPSs) have been proposed and introduced in 2012 with exhaustion of fossil fuels and reduction of greenhouse gas emissions in order to cope with international treaties, climate change treaties, and are becoming a burden for domestic energy manufacturers.
Accordingly, electric utilities are attempting to Integrate Gasification Combined Cycle (IGCC) and biomass mixing in an effort to reduce carbon dioxide emissions from coal.
However, IGCC cannot use existing coal-fired power stations, requires a high construction cost of about 13000 million korean for each coal-fired power station, and requires additional installation of Carbon Capture and Storage (CCS) for treatment to remove carbon dioxide, which causes a very large economic burden.
In the case of biomass mixing, since biomass burns at a lower calorific value than coal, the power generation efficiency is lowered. In the case of a mixed fuel of coal and oil-based biomass, the surface of the coal is coated with oil or pores on the surface of the coal are impregnated with oil. However, due to the low surface tension of the oil itself and the weak bonding of the oil-based biomass to the coal surface, the coal and biomass each maintain their own combustion characteristics, and as a result, exhibit different combustion characteristics. Therefore, in power plant applications, oxygen, which is excessive due to the low-temperature combustion mode of oil, is burned first at the front side of the burner, and combustion of coal is finally suppressed, resulting in an increase in unburned carbon and a decrease in power generation efficiency.
Therefore, in order to promote development and utilization of renewable energy sources and to ensure supply stability of biomass fuel, it is necessary to study and develop improvement of low-rank coal using biomass-derived materials.
[ related literature ]
[ document 1] Korean patent No. 10-1860037
[ document 2] Korean patent No. 10-1195416
Disclosure of Invention
Technical problem
Accordingly, the present invention aims to provide a solid fuel reheat steam treatment system for improving a solid fuel, which effectively dries and thermally treats the solid fuel by impregnating or coating the solid fuel with a biological liquid including a liquid component (including glucose and xylose and/or lignin), and directly heating the solid fuel using high temperature reheat steam.
Technical proposal
According to one aspect of the present invention, there is provided a solid fuel reheat steam treatment system comprising: a pretreatment unit to which the solid fuel is supplied to inject the bio-liquid onto the solid fuel, thereby impregnating the solid fuel with the bio-liquid; a heat treatment unit to which the solid fuel impregnated with the biological liquid is supplied to heat treat the solid fuel impregnated with the biological liquid; a reheat steam supply unit that supplies reheat steam to the heat treatment unit to directly heat the solid fuel supplied to the heat treatment unit; a cooling unit to which the solid fuel heat-treated by the heat treatment unit is supplied to cool the solid fuel; and a coolant supply unit that supplies coolant to the cooling unit to cool the solid fuel supplied into the cooling unit.
The preprocessing unit may include: a first body to which solid fuel is supplied; a biological liquid injection unit provided in the first body to inject biological liquid onto the solid fuel supplied into the first body; and a biological liquid supply unit communicating with the biological liquid injection unit to supply the biological liquid to the biological liquid injection unit.
The biological liquid ejection unit may include at least one biological liquid ejection tube, each of the biological liquid ejection tubes including a plurality of first nozzles arranged in the first body in a length direction of the first body to eject the biological liquid.
The first body may include a cylindrical rotary kiln rotating at a predetermined speed.
The heat treatment unit may include: a second body into which a solid fuel impregnated with a biological liquid is supplied; and a reheat steam injection unit provided at an outlet of the second body to inject reheat steam supplied from the reheat steam supply unit into the second body.
The reheat steam injection unit may include: a reheat steam supply unit including a plurality of reheat steam channels, each of the plurality of reheat steam channels having a reheat steam nozzle attached at an end; a reheat steam injection plate into which reheat steam nozzles are embedded; and a reheat steam main nozzle coupled to the reheat steam path and formed at a center axis of the reheat steam injection plate.
The reheat steam injection unit may further include: a reheat steam bending member for guiding reheat steam to be sprayed toward the center of the second body along the periphery of the end of the reheat steam spray plate; and a reheat steam turbulence forming member formed between the reheat steam bending member and the one end of the reheat steam injection plate to cause turbulence in the injected reheat steam.
The cooling unit may include: a third body into which the solid fuel heat-treated by the heat treatment unit is supplied; a jacket disposed around the third body; and a coolant injection unit disposed between the third body and the jacket to inject coolant onto an outer surface of the third body.
The coolant injection unit may include at least one coolant injection pipe, each including a plurality of second nozzles arranged between the third body and the jacket in a length direction of the third body to inject the coolant.
The cooling unit may further include a water tank disposed below the jacket to store the coolant discharged through the outlet of the jacket, thereby circulating the coolant sprayed by the coolant spraying unit to the coolant supply unit.
The solid fuel reheat steam treatment system may further include: an impurity removing unit configured to remove impurities contained in the steam discharged from the heat treatment unit; a blower unit configured to circulate the steam passing through the impurity removing unit to the reheat steam supply unit; and a discharge unit configured to discharge the steam passing through the blower unit as much as the steam flow generated during the heat treatment of the solid fuel by the heat treatment unit.
The impurity removal unit may include at least one cyclone separator and at least one bag filter in communication with the cyclone separator.
The solid fuel reheat steam treatment system may further include: a pulverizing unit configured to pulverize a solid fuel; a separation unit configured to separate the solid fuel pulverized by the pulverizing unit to have an average particle diameter of 6mm or less; and a storage unit configured to store the solid fuel separated by the separation unit, and the solid fuel stored in the storage unit may be supplied into the pretreatment unit.
The solid fuel reheat steam treatment system may further include a conveying unit disposed between the storage unit and the pretreatment unit to convey the solid fuel stored in the storage unit to the pretreatment unit.
The conveying unit may include: a first screw feeder configured to convey solid fuel stored in the storage unit; a bucket in which the solid fuel conveyed by the first screw feeder is contained; and a lifter to which the bucket is connected to lift the bucket in a height direction, the bucket being liftable by the lifter, and solid fuel contained in the lifted bucket being supplied into the pretreatment unit.
Advantageous effects
Embodiments of the present invention may improve the solid fuel by impregnating or coating micropores of the solid fuel with a biological liquid including a liquid component (including glucose and xylose and/or lignin) and drying and heat treating the solid fuel to increase the heating value of the solid fuel.
In addition, embodiments of the present invention can effectively dry and heat treat a solid fuel by directly heating the solid fuel impregnated or coated with a biological liquid using high temperature reheat steam.
In addition, embodiments of the present invention can prevent fires and reduce drying and heat treatment times by direct heat treatment of solid fuels using high temperature reheat steam.
Drawings
Fig. 1 is a schematic diagram showing the architecture of a solid fuel reheat steam treatment system according to the present invention.
Fig. 2 is a diagram showing a solid fuel reheat steam treatment system according to the present invention.
Fig. 3 is an enlarged view showing a pulverizing unit and a separating unit according to the present invention.
Fig. 4 is an enlarged view showing a storage unit, a transfer unit and a pretreatment unit according to the present invention.
Fig. 5 is an enlarged view illustrating a heat treatment unit, an impurity removal unit, a blower unit, a discharge unit, and a reheat steam supply unit according to the present invention.
Fig. 6 is a front view illustrating a reheat steam injection unit according to the present invention.
Fig. 7 is a side sectional view showing a reheat steam injection unit according to the present invention.
Fig. 8 is an enlarged view showing a cooling unit and a coolant supply unit according to the present invention.
Fig. 9 is a table showing approximate analysis, limit analysis, high calorific value, and low calorific value before and after the solid fuel is treated by the solid fuel reheat steam treatment system according to the present invention.
Fig. 10 is a graph showing auto-ignition (combustion) temperatures before solid fuel is processed by the solid fuel reheat steam treatment system according to the present invention.
Fig. 11 is a graph showing auto-ignition (combustion) temperatures after processing of solid fuel by the solid fuel reheat steam processing system according to the present invention.
Detailed Description
For a fuller understanding of the invention, the operational advantages of the invention, and the objects attained by the embodiments of the invention, reference should be made to the accompanying drawings which show exemplary embodiments of the invention and the scenes described in the accompanying drawings.
Hereinafter, the present invention will be described in detail by describing exemplary embodiments thereof with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements.
Fig. 1 is a schematic diagram showing a solid fuel reheat steam treatment system according to the present invention, fig. 2 is a diagram showing a solid fuel reheat steam treatment system according to the present invention, fig. 3 is an enlarged view showing a pulverizing unit and a separating unit according to the present invention, fig. 4 is an enlarged view showing a storage unit, a conveying unit and a pretreatment unit according to the present invention, fig. 5 is an enlarged view showing a heat treatment unit, an impurity removal unit, a blower unit, a discharge unit and a reheat steam supply unit according to the present invention, fig. 6 is a front view showing a reheat steam injection unit according to the present invention, fig. 7 is a side sectional view showing a reheat steam injection unit according to the present invention, and fig. 8 is an enlarged view showing a cooling unit and a coolant supply unit according to the present invention.
Referring to fig. 1 to 8, a solid fuel reheat steam treatment system 100 according to the present invention includes: a pulverizing unit 110 for pulverizing the solid fuel; a separation unit 115 for separating the solid fuel pulverized by the pulverizing unit 110 according to a predetermined particle size requirement; a storage unit 118 for storing the solid fuel separated by the separation unit 115; a pretreatment unit 130, the solid fuel stored in the storage unit 118 being supplied into the pretreatment unit 130 to inject a bio-liquid including a liquid component including glucose and xylose and/or lignin onto the solid fuel so as to impregnate the solid fuel with the bio-liquid; a heat treatment unit 140 to which the solid fuel impregnated with the bio-liquid is supplied from the pretreatment unit 130 to heat treat the solid fuel impregnated with the bio-liquid; a reheat steam supply unit 160 for supplying reheat steam to the heat treatment unit 140 to directly heat the solid fuel supplied into the heat treatment unit 140; a cooling unit 170, the solid fuel heat-treated by the heat treatment unit 140 being supplied into the cooling unit 170 to cool the solid fuel; and a coolant supply unit 180 that supplies coolant to the cooling unit 170 to cool the solid fuel supplied into the cooling unit 170.
In this embodiment, the solid fuel may be at least one selected from low-rank coals such as peat, lignite, subbituminous coals, bituminous coals and anthracite coals, and the solid fuel may include biomass and combustible waste. In addition, in the present embodiment, the solid fuel is not limited thereto, and includes any kind of solid fuel having a heating value used as a boiler fuel.
Referring to fig. 2 and 3, since the solid fuels supplied as raw materials are different in size, it is necessary to reduce the average particle diameter of the solid fuels before supplying the solid fuels to the pretreatment unit 130 and the heat treatment unit 140 described below. Thus, in the present embodiment, the system comprises a pulverizing unit 110 for pulverizing the solid fuel and a separation unit 115 for separating the pulverized solid fuel according to a predetermined particle size requirement.
The pulverizing unit 110 pulverizes solid fuel supplied as a raw material. For this, the pulverizing unit 110 includes a pulverizer 111 to pulverize the solid fuel. In addition, the solid fuel pulverized by the pulverizing unit 110 is supplied to the separation unit 115 located nearby.
Particle size requirements of the solid fuel are necessary for impregnating or coating the solid fuel with the biological liquid through the pretreatment unit 130 and improving drying and heat treatment efficiency of the solid fuel through the heat treatment unit 140.
In the present embodiment, the average particle diameter standard of the solid fuel may preferably be 6mm or less. Crushed solid fuel larger than the average particle size standard is re-supplied to the crusher 111. In the case where the solid fuel is not classified according to the average particle diameter standard, it is difficult to obtain the impregnation or coating effect on the solid fuel and the uniform drying and heat treatment effect on the solid fuel.
The solid fuel having a particle diameter of 6mm or less and the solid fuel having a particle diameter of more than 6mm are separated by the separation unit 115 and stored separately, and as described above, the solid fuel having a particle diameter of more than 6mm may be supplied to the pulverizer 111 and pulverized again.
Meanwhile, the solid fuel having a particle diameter of 6mm or less is stored in the storage unit 118 and supplied to the pretreatment unit 130 as described below.
Referring to fig. 2 and 4, the pretreatment unit 130 impregnates or coats the solid fuel with the bio-liquid by injecting the bio-liquid into the solid fuel. In this embodiment, the biological fluid comprises a liquid component comprising glucose and xylose and/or lignin. The pretreatment unit 130 modifies the low-order solid fuel having a low heat value into a solid fuel having a high heat value.
In this example, a biological liquid was prepared as a solution having a prescribed concentration using a liquid component containing glucose and xylose and/or a liquid component containing lignin.
The concentration of the biological fluid means a solution ratio of the supplied liquid component to the total biological fluid, and may be more than 0 and less than 1. Preferably, the concentration of the biological liquid may be 0.3 or more and 0.95 or less, more preferably 0.5 or more and 0.9 or less.
When the concentration of the biological liquid is higher than 0.9, it is difficult to spray the biological liquid due to high viscosity, and when the concentration of the biological liquid is lower than 0.5, higher process cost is required due to high moisture content.
The preprocessing unit 130 includes: a first body 131, the solid fuel being supplied to the first body 131; a biological liquid injection unit 132, the biological liquid injection unit 132 being disposed inside the first body 131 to inject biological liquid onto the solid fuel supplied into the first body 131; and a biological liquid supply unit 135, the biological liquid supply unit 135 communicating with the biological liquid injection unit 132 to supply the biological liquid to the biological liquid injection unit 132.
The biological liquid ejection unit 132 includes at least one biological liquid ejection tube 132 having a plurality of first nozzles 133, the plurality of first nozzles 133 being arranged in the first body 131 along a length direction of the first body 131 to eject the biological liquid. In addition, the biological liquid supply unit 135 includes: a biological fluid storage tank 136 in which a biological fluid is stored; and a pump 137, the pump 137 being connected to the biological liquid storage tank 136 to supply the biological liquid stored in the biological liquid storage tank 136 to the biological liquid injection pipe 132.
The first body 131 may include a cylindrical rotary kiln rotating at a predetermined speed. The first body 131 is rotated in a clockwise or counterclockwise direction by a first driving unit (not shown), and the solid fuel, which moves upward along the inner wall of the first body 131, falls down and slides downward at an angle of repose or greater in the first body 131. As the first body 131 rotates, the solid fuel rotates within the first body 131 and moves toward the outlet.
Further, the first body 131 includes a plurality of blades (not shown) therein for smoothly moving the solid fuel. The vane enables smooth movement of the solid fuel supplied into the first body 131.
The vanes raise the solid fuel and drop the solid fuel at a predetermined position as the first body 131 rotates, and the shape of each vane and the drop position of the solid fuel may be different.
The falling of the solid fuel at a predetermined position is repeated by the rotation of the first body 131 and the vane, and this is called a waterfall effect because it looks like a waterfall where water falls. As the upward movement and the falling of the solid fuel are repeated, the surface of the solid fuel is exposed, and by spraying the biological liquid onto the exposed surface, the solid fuel is uniformly impregnated or coated with the biological liquid.
That is, when the solid fuel moves within the first body 131, the bio-liquid is injected onto the solid fuel through the plurality of first nozzles 133 formed in the bio-liquid injection tube 132. The bio-liquid injection tube 132 may pass through the first body 131 in a length direction, the pump 137 of the bio-liquid supply unit 135 supplies the bio-liquid to the bio-liquid injection tube 132, and injects the bio-liquid onto the solid fuel through the plurality of first nozzles 133.
Meanwhile, the system may include a transfer unit 120, the transfer unit 120 being between the storage unit 118 and the preprocessing unit 130 to transfer the solid fuel stored in the storage unit 118 to the preprocessing unit 130.
The conveying unit 120 includes: a first screw feeder 121 for conveying the solid fuel stored in the storage unit 118; a bucket 123 in which the solid fuel conveyed by the first screw feeder 121 is accommodated; and an elevator 125 connected to the bucket 123 to raise the bucket 123 in the height direction.
When the solid fuel stored in the storage unit 118 is supplied to the first screw feeder 121, the solid fuel is transferred to the bucket 123 by the first screw feeder and is contained in the bucket 123. When the solid fuel is accommodated in the bucket 123, the bucket 123 is disposed at a lower portion of the elevator 125, and when the solid fuel is accommodated in the bucket 123, the bucket 123 is moved upward in a height direction by the elevator 125 and is thrown into the first body 131 of the pretreatment unit 130.
As described above, when the first body 131 rotates, the solid fuel rotates within the first body 131 and moves toward the outlet (i.e., toward the heat treatment unit 140 as described below), and the solid fuel is impregnated or coated with the biological liquid while the solid fuel moves.
However, when the solid fuel is impregnated or coated with the bio-liquid, the micropores of the solid fuel are impregnated or coated with the bio-liquid, but since the surfaces of the bio-liquid and the solid fuel are hydrophilic or have a strong affinity for water, the quality of the solid fuel is degraded due to adsorption of water in the air, and in order to prevent this, an additional process is required. Accordingly, the hydrophobizing process may be performed to prevent adsorption of water on the solid fuel impregnated or coated with the biofluid, and may be accomplished by drying and heat-treating the solid fuel impregnated or coated with the biofluid. Thus, in the present embodiment, the solid fuel impregnated or coated with the bio-liquid within the first body 131 is supplied into the heat treatment unit 140 and dried and heat-treated.
In addition, the solid fuel impregnated or coated with the biological liquid discharged from the pretreatment unit 130 may be supplied into the heat treatment unit 140 through the second screw feeder 190.
Referring to fig. 2 and 5 to 7, the heat treatment unit 140 dries and heat-treats the solid fuel impregnated or coated with the bio-liquid by direct heating.
The heat treatment unit 140 includes: a second body 141, into which the solid fuel impregnated with the biological liquid is supplied; and a reheat steam injection unit 142, the reheat steam injection unit 142 being disposed at an outlet of the second body 141 to inject reheat steam supplied from a reheat steam supply unit 160 described below into the second body 141.
The second body 141 may include a cylindrical rotary kiln rotating at a predetermined speed. The second body 141 is rotated in a clockwise or counterclockwise direction by a second driving unit (not shown), and the solid fuel, which moves upward along the inner wall of the second body 141, falls down and slides downward at an angle of repose or an angle greater than the angle of repose within the second body 141. As the second body 141 rotates, the solid fuel rotates within the second body 141 and is dried while it moves toward the outlet.
Further, the second body 141 includes a plurality of blades (not shown) therein for smooth movement of the solid fuel. The vane enables the solid fuel supplied into the second body 141 to smoothly move.
The vane lifts up the solid fuel and drops the solid fuel at a predetermined position as the second body 141 rotates, and the shape of each vane and the drop position of the solid fuel may be different.
As the upward movement and dropping of the solid fuel is repeated, the surface of the solid fuel is exposed, and the solid fuel is dried and heat-treated by contact of reheat steam with the exposed surface. Meanwhile, the second driving unit includes a roller to rotate the second body 141 while being in close contact with the outer wall of the second body 141.
In addition, a reheat steam injection unit 142 is provided at an outlet of the second body 141 to inject reheat steam to directly heat the reheat steam while the solid fuel moves in the second body 141. Reheat steam injection unit 142 injects reheat steam toward the direction of movement of the solid fuel. The reheat steam sprayed onto the second body 141 by the reheat steam spraying unit 142 may be 300 to 500 ℃.
When the temperature of the reheat steam is maintained at 300 to 500 ℃, heat is easily transferred to the solid fuel, re-adsorption of moisture contained in the solid fuel into micropores of the solid fuel after evaporation of the moisture can be prevented, thereby making it easy to transport and store the solid fuel, and an improved solid fuel having a high heat value of the solid fuel is obtained.
After measuring the internal pressure of the second body 141, as described below, steam generated during the drying and heat treatment of the solid fuel is discharged through the discharge unit 158.
When reheat steam of 300 to 500 ℃ is used, the solid fuel changes from hydrophilic to hydrophobic by surface modification. In the case where the solid fuel is exposed to air and directly contacts moisture (e.g., rainwater), the solid fuel does not become wet again, and thus is easy to store externally. In addition, when the solid fuel is hydrophobic, spontaneous combustion in the air is prevented.
In addition, by the heat treatment of the solid fuel impregnated or coated with the biological liquid as described above, for example, the heat treatment using reheat steam, the low-rank coal can be changed to have the heat value characteristics of the high-rank coal (see fig. 9). Therefore, when modified upgraded coal is used as a fuel for power generation, it is possible to use high-rank coal in an existing power plant and reduce environmental load such as greenhouse gas emissions.
In addition, since the combustion temperature of the dried and heat-treated solid fuel increases, spontaneous combustion does not occur (see fig. 10 and 11).
When the solid fuel is kept outside in summer, autoignition may occur due to an increase in internal temperature. However, as described in the present embodiment, when the solid fuel is dried and heat-treated by the high-temperature reheat steam in the heat treatment unit 140, the combustion temperature increases, and thus, spontaneous combustion does not occur even when the dried and heat-treated solid fuel is maintained under the same conditions.
In addition, when the solid fuel is dried and heat-treated, the surface of the solid fuel becomes hydrophobic, thereby preventing moisture from being re-adsorbed. In addition, when the surface of the solid fuel becomes hydrophobic, the contact angle between the water droplet and the surface on which the water droplet is placed may be 30 ° or more.
The reheat steam injection unit 142 includes: a reheat steam supply unit 143, the reheat steam supply unit 143 having a plurality of reheat steam channels, each of the reheat steam channels being connected at an end portion to a reheat steam nozzle 148; reheat steam injection plate 144, reheat steam nozzle 148 is embedded in reheat steam injection plate 144; and a reheat steam main nozzle 145, the reheat steam main nozzle 145 being coupled to the reheat steam path and formed at a center axis of the reheat steam injection plate 144.
In addition, the reheat steam injection unit 142 may further include: a reheat steam bending member 146 for guiding reheat steam to be sprayed toward the center of the second body 141 along the periphery of the end of the reheat steam spray plate 144; and a reheat steam turbulence forming member 147, the reheat steam turbulence forming member 147 being formed between the reheat steam bending member 146 and the end of the reheat steam injection plate 144 to cause turbulence in the injected reheat steam.
The injection pressure of reheat steam nozzle 148 is preferably at 100mm H 2 O and 500mm H 2 And O. The high pressure reheat steam is directly sprayed onto the supplied solid fuel, and since small particles and dust generated at this time are diffused and discharged from the impurity removing unit 150 as described below, it is necessary to change to the low pressure reheat steam.
Meanwhile, steam generated during the drying and heat treatment of the solid fuel by the heat treatment unit 140 (specifically, the second body 141) is discharged from the second body 141, and impurities contained in the steam discharged from the second body 141 are removed by the impurity removal unit 150.
The impurity removing unit 150 may include at least one cyclone 151 and at least one bag filter 152 in communication with the cyclone 151. In addition, the steam passing through the impurity removing unit 150 is supplied to the reheat steam supply unit 160. The blower unit 155 is provided at a rear end of the impurity removing unit 150 to supply and circulate the steam passing through the impurity removing unit 150 to the reheat steam supply unit 160.
Further, a part of the steam passing through the impurity removing unit 150 is discharged through the discharging unit 158. Since the steam passing through the impurity removing unit 150 further includes steam generated during the drying and heat treatment of the solid fuel, the excessive steam is discharged as much as the increased steam flow during the drying and heat treatment through the discharging unit 158.
In the present embodiment, when reheat steam is supplied to the heat treatment unit 140 by the reheat steam supply unit 160, preheating is performed by measuring the oxygen concentration in the reheat steam until the oxygen concentration is 5% or less. When the preheating is completed and the oxygen concentration in the reheat steam is 5% or less, the reheat steam is supplied to the heat treatment unit 140.
As described above, in the present embodiment, the heat treatment unit 140, the impurity removal unit 150, the blower unit 155, and the reheat steam supply unit 160 recover energy in a closed loop cycle, thereby improving energy efficiency.
In addition, the solid fuel dried and heat-treated by the heat treatment unit 140 is supplied into the cooling unit 170.
The cooling unit 170 cools the dried and heat-treated solid fuel while the solid fuel is supplied.
The cooling unit 170 includes: a third body 171, into which the solid fuel heat-treated by the heat treatment unit 140 is supplied to the third body 171; a jacket 172, the jacket 172 being disposed around the third body 171; a coolant injection unit 176, the coolant injection unit 176 being disposed between the third body 171 and the jacket 172 to inject coolant onto an outer surface of the third body 171; and a water tank 178, the water tank 178 being disposed under the jacket 172 to store the coolant discharged through the outlet 175 of the jacket 172, thereby circulating the coolant injected through the coolant injection unit 176 to the coolant supply unit 180. In addition, the coolant injection unit 176 includes at least one coolant injection pipe 176, and each coolant injection pipe 176 includes a plurality of second nozzles 177 arranged between the third body 171 and the jacket 172 in the length direction of the third body 171 to inject the coolant.
The third body 171 may include a cylindrical rotary kiln rotating at a predetermined speed.
The third body 171 is rotated in a clockwise or counterclockwise direction by a third driving unit (not shown), and the solid fuel, which moves upward along the inner wall of the third body 171, falls down and slides downward within the third body 171 at an angle of repose or greater.
As the third body 171 rotates, the solid fuel rotates within the third body 171 and is cooled while it moves toward the outlet 175.
In addition, the third body 171 includes a plurality of blades (not shown) therein for smooth movement of the solid fuel. The vane enables the solid fuel supplied into the third body 171 to move smoothly.
The vane lifts up the solid fuel and drops the solid fuel at a predetermined position as the third body 171 rotates, and the shape of each vane and the drop position of the solid fuel may be different. When the upward movement and the falling of the solid fuel are repeated, the surface of the solid fuel is exposed and the cooling is promoted by the internal temperature of the third body 171.
In addition, as the solid fuel moves within the third body 171, the third body 171 is cooled to cool the solid fuel in the third body 171. That is, the solid fuel is cooled by indirect cooling by supplying a coolant to the jacket 172 to cool the third body 171.
Jacket 172 comprises: a housing 173, the housing 173 being disposed around the third body 171 to form a cooling space S between the housing 173 and an outer wall of the third body 171; an inlet 174, the inlet 174 being provided on the housing 173, the coolant supplied to the coolant supply unit 180 entering the inlet 174; and an outlet 175, the outlet 175 being disposed below the housing 173 and opposite to the inlet 174, the coolant passing through the cooling space S exiting the inlet 174.
In addition, at least one coolant injection pipe 176 is provided in the cooling space S between the third body 171 and the jacket 172, and the coolant injection pipe 176 includes a plurality of second nozzles 177 arranged along the length direction of the third body 171. The coolant supplied from the coolant supply unit 180 is supplied to the coolant injection pipe 176 through the inlet 174 of the jacket 172, and injected into the cooling space S through the plurality of second nozzles 177.
The coolant supplied from the coolant supply unit 180 enters the inlet 174, is injected through the coolant injection pipe 176, passes through the cooling space S provided in the housing 173, and exits the outlet 175 provided below the housing 173.
When the coolant cools the outer surface of the third body 171 through the cooling space of the cooling case 173, the inner temperature of the third body 171 is reduced by heat transfer and the solid fuel supplied into the third body 171 is cooled down.
In addition, the coolant discharged through the outlet 175 of the housing 173 is stored in the water tank 178, and is supplied and circulated to the coolant supply unit 180.
Meanwhile, the solid fuel cooled by the cooling unit 170 may be discharged by the third screw feeder 195.
The low-rank raw coal is compared with the coal modified by the solid fuel reheat steam treatment system 100 according to the present invention as follows.
Fig. 9 is a table showing approximate analysis, limit analysis, high calorific value, and low calorific value before and after the solid fuel is processed by the solid fuel reheat steam processing system according to the present invention, fig. 10 is a graph showing auto-ignition (combustion) temperature before the solid fuel is processed by the solid fuel reheat steam processing system according to the present invention, and fig. 11 is a graph showing auto-ignition (combustion) temperature after the solid fuel is processed by the solid fuel reheat steam processing system according to the present invention.
Referring to fig. 9, when the solid fuel reheat steam treatment system 100 according to the present invention is used, upgraded coal having moisture contents of 0.46wt% and 0.83wt% is obtained by drying and heat-treating raw coal having moisture contents of 30wt% and 26.19wt% before treatment, respectively. In addition, when the solid fuel reheat steam treatment system 100 according to the present invention is used, it can be seen that both the high calorific value and the low calorific value of the upgraded coal after the treatment are improved as compared to the high calorific value and the low calorific value of the raw coal before the treatment.
In addition, when the solid fuel reheat steam treatment system 100 according to the present invention is used, the auto-ignition temperature 163 deg.c of raw coal before treatment (see fig. 10) is raised to the auto-ignition temperature 214 deg.c of upgraded coal after treatment (see fig. 11), so that the risk of auto-ignition during fuel storage and transportation can be reduced.
The present invention is not limited to the disclosed embodiments and it will be apparent to those skilled in the art that various modifications and variations can be made thereto without departing from the spirit and scope of the invention. It is therefore to be noted that such modifications or changes fall within the scope of the claims of the present invention.
[ detailed description of the main parts ]
100: solid fuel reheat steam treatment system
110: crushing unit
111: pulverizer 115: separation device
118: the storage unit 120: conveying unit
121: first screw feeder 123: bucket
125: elevator 130: pretreatment unit
131: first body 132: biological liquid jet unit
135: biological liquid supply unit 136: biological liquid storage tank
137: pump 140: heat treatment unit
141: second body 142: reheat steam injection unit
143: reheat steam supply unit 144: reheat steam injection plate
145: reheat steam main nozzle
146: reheat steam bend member
147: reheat steam turbulence forming member
148: reheat steam nozzle
150: impurity removing unit 151: cyclone separator
152: bag filter 155: blower unit
158: the discharge unit 160: reheat steam supply unit
170: the cooling unit 171: a third main body
172: jacket 176: coolant injection unit
178: water tank 180: coolant supply unit
190: a second screw feeder 195: third screw feeder
[ Industrial applicability ]
The solid fuel reheat steam treatment system according to the present invention can convert a low-order solid fuel into an upgraded solid fuel having an increased heating value.
Claims (15)
1. A solid fuel reheat steam treatment system, comprising:
a pretreatment unit to which a solid fuel is supplied to inject a biological liquid onto the solid fuel to impregnate the solid fuel with the biological liquid;
a heat treatment unit to which the solid fuel impregnated with the biological liquid is supplied to heat treat the solid fuel impregnated with the biological liquid;
a reheat steam supply unit that supplies reheat steam to the heat treatment unit to directly heat the solid fuel supplied to the heat treatment unit;
a cooling unit to which the solid fuel heat-treated by the heat treatment unit is supplied to cool the solid fuel; and
and a coolant supply unit that supplies coolant to the cooling unit to cool the solid fuel supplied into the cooling unit.
2. The solid fuel reheat steam treatment system of claim 1, wherein the pretreatment unit comprises:
a first body into which the solid fuel is supplied;
a biological liquid injection unit provided within the first body to inject the biological liquid onto the solid fuel supplied into the first body; and
a biological liquid supply unit that communicates with the biological liquid injection unit to supply the biological liquid to the biological liquid injection unit.
3. The solid fuel reheat steam treatment system of claim 2, wherein the biological liquid injection unit includes at least one biological liquid injection pipe including a plurality of first nozzles arranged within the first body in a length direction of the first body to inject the biological liquid.
4. The solid fuel reheat steam treatment system of claim 2, wherein the first body comprises a cylindrical rotary kiln rotating at a predetermined speed.
5. The solid fuel reheat steam treatment system of claim 1, wherein the heat treatment unit comprises:
a second body into which the solid fuel impregnated with the biological liquid is supplied; and
and a reheat steam injection unit provided at an outlet of the second body to inject the reheat steam supplied from the reheat steam supply unit into the second body.
6. The solid fuel reheat steam treatment system of claim 5, wherein the reheat steam injection unit comprises:
a reheat steam supply unit including a plurality of reheat steam channels, each of the plurality of reheat steam channels having a reheat steam nozzle attached at an end;
a reheat steam injection plate into which the reheat steam nozzle is embedded; and
a reheat steam main nozzle coupled to the reheat steam path and formed at a center axis of the reheat steam injection plate.
7. The solid fuel reheat steam treatment system of claim 1, wherein the reheat steam injection unit further comprises:
a reheat steam bending member for guiding the reheat steam to be sprayed toward the center of the second body along the periphery of the end of the reheat steam spray plate; and
a reheat steam turbulence forming member formed between the reheat steam bending member and the end of the reheat steam injection plate to cause turbulence in the injected reheat steam.
8. The solid fuel reheat steam treatment system of claim 1, wherein the cooling unit comprises:
a third body into which the solid fuel heat-treated by the heat treatment unit is supplied;
a jacket disposed around the third body; and
and a coolant injection unit disposed between the third body and the jacket to inject a coolant onto an outer surface of the third body.
9. The solid fuel reheat steam treatment system of claim 8, wherein the coolant injection unit includes at least one coolant injection tube including a plurality of second nozzles arranged between the third body and the jacket along a length direction of the third body to inject the coolant.
10. The solid fuel reheat steam treatment system of claim 8, wherein the cooling unit further comprises a water tank provided below the jacket to store the coolant discharged through an outlet of the jacket, so that the coolant injected by the coolant injection unit is circulated to the coolant supply unit.
11. The solid fuel reheat steam treatment system of claim 1, further comprising:
an impurity removing unit configured to remove impurities contained in the steam discharged from the heat treatment unit;
a blower unit configured to circulate the steam passing through the impurity removing unit to the reheat steam supply unit; and
a discharge unit configured to discharge the steam passing through the blower unit as much as a steam flow generated during the heat treatment of the solid fuel by the heat treatment unit.
12. The solid fuel reheat steam treatment system of claim 11, wherein the impurity removal unit comprises:
at least one cyclone separator; and
at least one bag filter in communication with the cyclone.
13. The solid fuel reheat steam treatment system of claim 1, further comprising:
a pulverizing unit configured to pulverize the solid fuel;
a separation unit configured to separate the solid fuel pulverized by the pulverization unit having an average particle diameter of 6mm or less; and
a storage unit configured to store the solid fuel separated by the separation unit,
wherein the solid fuel stored in the storage unit is supplied into the pretreatment unit.
14. The solid fuel reheat steam treatment system of claim 13, further comprising:
and a conveying unit disposed between the storage unit and the pretreatment unit, for conveying the solid fuel stored in the storage unit to the pretreatment unit.
15. The solid fuel reheat steam treatment system of claim 14, wherein the delivery unit comprises:
a first screw feeder configured to convey the solid fuel stored in the storage unit;
a bucket in which the solid fuel conveyed by the first screw feeder is contained; and
an elevator, the bucket being connected to the elevator to raise the bucket in a height direction, and
wherein the bucket is lifted by the lifter, and the solid fuel contained in the lifted bucket is supplied into the pretreatment unit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2022/003791 WO2023176999A1 (en) | 2022-03-18 | 2022-03-18 | Solid fuel reheat steam treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117098828A true CN117098828A (en) | 2023-11-21 |
Family
ID=88023446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280003276.8A Pending CN117098828A (en) | 2022-03-18 | 2022-03-18 | Solid fuel reheat steam treatment system |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR20240005768A (en) |
| CN (1) | CN117098828A (en) |
| WO (1) | WO2023176999A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8637718B2 (en) * | 2009-09-25 | 2014-01-28 | Auburn University | Biomass to biochar conversion in subcritical water |
| KR101195416B1 (en) | 2012-02-29 | 2012-10-29 | 한국에너지기술연구원 | High caloric hybrid coal coated with carbon derived from biomass and manufacturing method thereof |
| KR101598576B1 (en) * | 2013-11-05 | 2016-03-02 | (주)동명기계 | Impregnation of biomass coal, advanced manufacturing equipment and manufacturing method |
| KR101695702B1 (en) * | 2015-07-09 | 2017-01-23 | 한국에너지기술연구원 | MODIFICATION METHOD FOR LOW RANK COAL USING 2nd GENERATION BIOMASS COMPRISED OF HEXOSE |
| KR101860037B1 (en) | 2016-08-09 | 2018-05-30 | 동원중공업(주) | The Steam Drying System |
-
2022
- 2022-03-18 WO PCT/KR2022/003791 patent/WO2023176999A1/en active Application Filing
- 2022-03-18 CN CN202280003276.8A patent/CN117098828A/en active Pending
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| WO2023176999A1 (en) | 2023-09-21 |
| KR20240005768A (en) | 2024-01-12 |
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