CN105567338A - Low-rank coal treatment system and method - Google Patents
Low-rank coal treatment system and method Download PDFInfo
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- CN105567338A CN105567338A CN201610055674.0A CN201610055674A CN105567338A CN 105567338 A CN105567338 A CN 105567338A CN 201610055674 A CN201610055674 A CN 201610055674A CN 105567338 A CN105567338 A CN 105567338A
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- 239000003245 coal Substances 0.000 title claims abstract description 496
- 238000000034 method Methods 0.000 title claims abstract description 115
- 238000011282 treatment Methods 0.000 title claims abstract description 19
- 238000002309 gasification Methods 0.000 claims abstract description 119
- 238000001035 drying Methods 0.000 claims abstract description 70
- 239000002918 waste heat Substances 0.000 claims abstract description 39
- 238000011084 recovery Methods 0.000 claims abstract description 31
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 238000012216 screening Methods 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims description 120
- 230000008569 process Effects 0.000 claims description 75
- 239000000843 powder Substances 0.000 claims description 73
- 238000009434 installation Methods 0.000 claims description 24
- 238000012545 processing Methods 0.000 claims description 19
- 238000004140 cleaning Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 230000026676 system process Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 15
- 230000000087 stabilizing effect Effects 0.000 description 12
- 230000009466 transformation Effects 0.000 description 11
- 230000018044 dehydration Effects 0.000 description 10
- 238000006297 dehydration reaction Methods 0.000 description 10
- 238000013467 fragmentation Methods 0.000 description 10
- 238000006062 fragmentation reaction Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 238000003912 environmental pollution Methods 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 239000005864 Sulphur Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000004523 agglutinating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- -1 sulfur-bearing Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 235000020985 whole grains Nutrition 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/86—Other features combined with waste-heat boilers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0903—Feed preparation
- C10J2300/0906—Physical processes, e.g. shredding, comminuting, chopping, sorting
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0903—Feed preparation
- C10J2300/0909—Drying
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention provides a low-rank coal treatment system and method. The system comprises a screening device, a lump coal hot wind combined type separation device, a powdered coal hot wind air separation device, a clean lump coal breaking device, a powdered coal drying device, a powdered coal gasifier and a waste heat recovery device, wherein the lump coal hot wind combined type separation device and the powdered coal hot wind air separation device are both connected with the screening device, the clean lump coal breaking device is connected with the lump coal hot wind combined type separation device, and the powdered coal drying device is connected with the clean lump coal breaking device and a powdered coal outlet of the screening device; the powdered coal gasifier is connected with the powdered coal drying device, the waste heat recovery device is connected with the powdered coal gasifier, and the waste heat recovery device is connected with the lump coal hot wind combined type separation device, the powdered coal hot wind air separation device and the powdered coal drying device. According to the system, lump coal grading technique, lump coal separation technique, lump coal drying and dewatering technique and powdered coal gasification technique are coupled, energy consumption and operation cost of the system are reduced, and environment pollution is reduced.
Description
Technical field
The invention belongs to chemical field, in particular to a kind of system and method processing low-rank coal.
Background technology
Low-rank coal mainly refers to the coal that agglutinating value(of coal) is poor, degree of coalification is low, common are brown coal, peat, long-flame coal, weathered coal etc.China's low-rank coal aboundresources, account for that China has verified coal total amount more than 55%.
Present stage, the main Land use systems of low-rank coal was direct combustion power generation, although this Land use systems is operationally simple, caused the significant wastage of the energy, equipment etc.In addition, the thermo-efficiency that low-rank coal is directly burnt is low, and can produce SOx, CO and NOx etc. and cause severe contamination to air after low-rank coal burning.Low-rank coal upgrading processing will become the key of low-rank coal Efficient Development utilization.The upgrading processing of low-rank coal comprises sorting, drying, shaping, pyrolysis, gasification etc., after low-rank coal deliming, dehydration, calorific value increases, can reduce the corrosion of equipment in following process process after low-rank coal desulfurization and reduce acid rain to the harm of environment, low-rank coal can expand it by upgrading processing and utilize scope.
Although the dirt in low-rank coal can be removed by sorting, but coal fully contacts with water in wet split process, coal selecting product moisture is caused to increase, reduce product thermal value, partial offset coal washing effect, the target of also dewatering with upgrading contradicts, and in the dry separation process of normal temperature, the surface-moisture of coal makes the sticking probability between particle large, discharge refuse weak effect.Independent drying and gasification technology improve the calorific value of low-rank coal to a certain extent, but the dirt such as ash, sulphur in upgraded coal affects the quality of following process product, and the compound such as sulfur-bearing, nitrogen pollutes environment and equipment corrosion.Therefore, fall grey desulfurization by dry separation, the method for drying and dehydrating and gasification upgrading will be improve brown coal calorific value and transformation efficiency, reduce a kind of effective way of energy consumption and environmental pollution simultaneously, improve Social benefit and economic benefit, meet China to develop clean coal technology the strategic demand of energy diversification, the new policy that active response national energy-saving reduces discharging.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is to propose a kind of system and method processing low-rank coal, by adopting this system and method successively low order raw coal to be carried out the process such as classification, sorting, drying, gasification, treatment capacity and the gasification gas quality of vapourizing furnace can be significantly improved.
According to an aspect of the present invention, the present invention proposes a kind of system processing low-rank coal.According to embodiments of the invention, this system comprises:
Screening plant, described screening plant has low-rank coal entrance, lump coal outlet and fine coal outlet;
Lump coal hot blast combined type sorting unit, described lump coal hot blast combined type sorting unit has lump coal entrance, the outlet of block cleaned coal, the first hot-wind inlet and the first offgas outlet, and described lump coal entrance exports with described lump coal and is connected;
Fine coal hot-air flow sorting unit, described fine coal hot-air flow sorting unit has fine coal entrance, the first powder cleaned coal outlet, the second hot-wind inlet and the second offgas outlet, and described fine coal entrance exports with described fine coal and is connected;
Block cleaned coal shredder assembly, described piece of cleaned coal shredder assembly has block cleaned coal entrance and the outlet of the second powder cleaned coal, and described piece of cleaned coal entrance exports with described block of cleaned coal and be connected;
Fine coal drying installation, described fine coal drying installation has powder cleaned coal entrance, the outlet of xeraphium cleaned coal, the 3rd hot-wind inlet and the 3rd offgas outlet, and described powder cleaned coal entrance exports with described first powder cleaned coal respectively to export with described second powder cleaned coal and is connected;
Powder coal gasification furnace, described powder coal gasification furnace has feeding mouth, the outlet of gasification gas and slag-drip opening, and described feeding mouth exports with described xeraphium cleaned coal and is connected; And
Waste-heat recovery device, described waste-heat recovery device has gasification gas entrance, the outlet of cool gasification gas and heat outlet, described gasification gas entrance exports with described gasification gas and is connected, and described heat outlet is connected with described 3rd hot-wind inlet with described first hot-wind inlet, described second hot-wind inlet respectively.
Thus, classification, sorting and bed pulverized coal gasification technology are coupled by the system according to the process low-rank coal of the embodiment of the present invention, waste-heat recovery device is adopted to reclaim the waste heat of gasification gas as sorting and drying medium, reduce system energy consumption and running cost, reduce environmental pollution, meanwhile, the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal is improved.Raw coal falls through dehydration the dirt content that can reduce in the energy consumption of gasification and product that carries out again gasifying after ash process.Particularly, this system medium-sized coal hot blast combined type sorting unit and fine coal hot-air flow sorting unit adopt hot gas flow to carry out sorting to low-rank coal, can improve lump coal, the efficiency of separation of fine coal and dehydration rate; Lump coal carries out fragmentation through block cleaned coal shredder assembly again after sorting process, can reduce comminution energy conssumption; Lump coal, after fragmentation, can enlarge markedly the contact area with drying medium, and then improves drying efficiency; Low-rank coal, after sorting discharge refuse, decreases unit consumption of energy and the gasification gas impurity of gasification.
In addition, the system of process low-rank coal according to the above embodiment of the present invention can also have following additional technical characteristic:
In some embodiments of the invention, the system of described process low-rank coal comprises further: cleaning apparatus, described cleaning apparatus has gas inlet, dust outlet and pneumatic outlet, and described gas inlet is connected with the 3rd offgas outlet with described first offgas outlet, the second offgas outlet respectively.
According to another aspect of the present invention, the present invention proposes a kind of method processing low-rank coal.According to embodiments of the invention, the method adopts the system of process low-rank coal described above to carry out.According to a particular embodiment of the invention, the method comprises:
(1) described low-rank coal is supplied in described screening plant carry out screening process, to obtain lump coal and fine coal respectively;
(2) described lump coal is supplied in described lump coal hot blast combined type sorting unit, and adopts hot blast to carry out sorting process to described lump coal, to obtain block cleaned coal and the first tail gas;
(3) described fine coal is supplied in described fine coal hot-air flow sorting unit, and adopts hot blast to carry out pneumatic separation process to described fine coal, to obtain the first powder cleaned coal and the second tail gas;
(4) described block of cleaned coal is supplied in described piece of cleaned coal shredder assembly carries out break process, to obtain the second powder cleaned coal;
(5) described first powder cleaned coal and described second powder cleaned coal are supplied in described fine coal drying installation, and adopt hot blast to carry out drying treatment, to obtain xeraphium cleaned coal and the 3rd tail gas;
(6) described xeraphium cleaned coal is supplied in described powder coal gasification furnace gasifies, to obtain the gas that gasifies;
(7) described gasification gas is supplied in described waste-heat recovery device carries out waste heat recovery processing, to produce hot gas, and by described hot gas, return step (2), step (3) and step (5) respectively and use as described hot blast.
Thus, classification, sorting and bed pulverized coal gasification technology are coupled by the method according to the process low-rank coal of the embodiment of the present invention, waste-heat recovery device is adopted to reclaim the waste heat of gasification gas as sorting and drying medium, reduce system energy consumption and running cost, reduce environmental pollution, meanwhile, the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal is improved.Raw coal falls through dehydration the dirt content that can reduce in the energy consumption of gasification and product that carries out again gasifying after ash process.Particularly, lump coal, the efficiency of separation of fine coal and dehydration rate can be improved by the hot gas flow classification and sorting of raw coal in this system; Lump coal carries out crushing energy again and reduces comminution energy conssumption after sorting process; The contact area of lump coal fine coal and drying medium after fragmentation increases, and drying efficiency improves; Raw coal, after sorting discharge refuse, decreases unit consumption of energy and the gasification gas impurity of gasification.
In addition, the method for process low-rank coal according to the above embodiment of the present invention can also have following additional technical characteristic:
In some embodiments of the invention, the method for described process low-rank coal comprises further: the 3rd tail gas produced in the second tail gas produced in the first tail gas produced in step (2), step (3) and step (5) is supplied in described cleaning apparatus and carries out dust removal process by (8).
In some embodiments of the invention, the granularity of described lump coal is for being not less than 6 millimeters, and the granularity of described fine coal is lower than 6 millimeters.
In some embodiments of the invention, the granularity of described xeraphium cleaned coal is lower than 6 millimeters.
In some embodiments of the invention, in step (2), the hot blast that employing gas flow temperature is 100-130 degree Celsius is 9-24m/s with upstream speed carries out the process of described combined type dry separation;
In step (3), the hot blast that employing gas flow temperature is 100-130 degree Celsius is 4-9m/s with upstream speed carries out described pneumatic separation process.
In some embodiments of the invention, in step (5), adopt temperature to be 100-200 degree Celsius and carry out described drying treatment with gas velocity 0.1-0.5m/s hot blast.
In some embodiments of the invention, the water ratio of described xeraphium cleaned coal is lower than 10 % by weight.
In some embodiments of the invention, in step (6), the temperature of described gasification is 800-1100 degree Celsius.
Accompanying drawing explanation
Fig. 1 is the structural representation of the system processing low-rank coal according to an embodiment of the invention.
Fig. 2 is the structural representation of the system processing low-rank coal in accordance with another embodiment of the present invention.
Fig. 3 is the schema of the method processing low-rank coal according to an embodiment of the invention.
Fig. 4 is the schema of the method processing low-rank coal in accordance with another embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In one aspect of the invention, the present invention proposes a kind of system processing low-rank coal.According to embodiments of the invention, this system comprises:
Screening plant, described screening plant has low-rank coal entrance, lump coal outlet and fine coal outlet;
Lump coal hot blast combined type sorting unit, described lump coal hot blast combined type sorting unit has lump coal entrance, the outlet of block cleaned coal, the first hot-wind inlet and the first offgas outlet, and described lump coal entrance exports with described lump coal and is connected;
Fine coal hot-air flow sorting unit, described fine coal hot-air flow sorting unit has fine coal entrance, the first powder cleaned coal outlet, the second hot-wind inlet and the second offgas outlet, and described fine coal entrance exports with described fine coal and is connected;
Block cleaned coal shredder assembly, described piece of cleaned coal shredder assembly has block cleaned coal entrance and the outlet of the second powder cleaned coal, and described piece of cleaned coal entrance exports with described block of cleaned coal and be connected;
Fine coal drying installation, described fine coal drying installation has powder cleaned coal entrance, the outlet of xeraphium cleaned coal, the 3rd hot-wind inlet and the 3rd offgas outlet, and described powder cleaned coal entrance exports with described first powder cleaned coal respectively to export with described second powder cleaned coal and is connected;
Powder coal gasification furnace, described powder coal gasification furnace has feeding mouth, the outlet of gasification gas and slag-drip opening, and described feeding mouth exports with described xeraphium cleaned coal and is connected; And
Waste-heat recovery device, described waste-heat recovery device has gasification gas entrance, the outlet of cool gasification gas and heat outlet, described gasification gas entrance exports with described gasification gas and is connected, and described heat outlet is connected with described 3rd hot-wind inlet with described first hot-wind inlet, described second hot-wind inlet respectively
Thus, classification, sorting and bed pulverized coal gasification technology are coupled by the system according to the process low-rank coal of the embodiment of the present invention, waste-heat recovery device is adopted to reclaim the waste heat of gasification gas as sorting and drying medium, reduce system energy consumption and running cost, reduce environmental pollution, meanwhile, the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal is improved.Raw coal falls through dehydration the dirt content that can reduce in the energy consumption of gasification and product that carries out again gasifying after ash process.Particularly, this system medium-sized coal hot blast combined type sorting unit and fine coal hot-air flow sorting unit adopt hot gas flow to carry out sorting to low-rank coal, can improve lump coal, the efficiency of separation of fine coal and dehydration rate; Lump coal carries out fragmentation through block cleaned coal shredder assembly again after sorting process, can reduce comminution energy conssumption; Lump coal, after fragmentation, can enlarge markedly the contact area with drying medium, and then improves drying efficiency; Low-rank coal, after sorting discharge refuse, decreases unit consumption of energy and the gasification gas impurity of gasification.
Below with reference to Fig. 1-2, the system of the process low-rank coal of the embodiment of the present invention is described in detail.According to embodiments of the invention, this system comprises: screening plant 100, lump coal hot blast combined type sorting unit 200, fine coal hot-air flow sorting unit 300, block cleaned coal shredder assembly 400, fine coal drying cartridge 500, powder coal gasification furnace 600 and waste-heat recovery device 700.
According to a particular embodiment of the invention, screening plant 100 has low-rank coal entrance 101, lump coal outlet 102 and fine coal outlet 103.Thus, utilize screening plant 100 can carry out screening process to low-rank coal, and obtain lump coal and fine coal respectively.
According to a particular embodiment of the invention, the pulverized coal particle size that above-mentioned screening obtains is not higher than 6mm, directly the fine coal of this granularity can be supplied in powder coal gasification furnace 600 thus and carry out gasification process, and the lump coal of greater particle size is gasified after follow-up fragmentation again, thus the waste of gasification medium-sized coal can be avoided, and then raw material availability can be improved.
According to a particular embodiment of the invention, lump coal hot blast combined type sorting unit 200 has lump coal entrance 201, block cleaned coal outlet the 202, first hot-wind inlet 203 and the first offgas outlet 204, and described lump coal entrance 201 and described lump coal export 102 and is connected.Thus, utilize lump coal hot blast combined type sorting unit 200 can sieve to screening plant 100 lump coal obtained and carry out sorting process, hot blast can be adopted particularly to carry out sorting process to lump coal, and obtain block cleaned coal and the first tail gas.By adopting lump coal hot blast combined type sorting unit can improve the efficiency of separation further, and then provide high quality raw material for follow-up gasification.In addition, spoil in raw coal and the outer water of part can be removed through sorting, the block cleaned coal hardness obtained after sorting reduction, and then the comminution energy conssumption to block cleaned coal can be saved.
According to a particular embodiment of the invention, fine coal hot-air flow sorting unit 300 has fine coal entrance 301, first powder cleaned coal outlet the 302, second hot-wind inlet 303 and the second offgas outlet 304, and described fine coal entrance 301 and described fine coal export 103 and is connected.Hot blast can being adopted particularly to carry out sorting process to fine coal, obtain powder cleaned coal, by adopting hot blast can improve the efficiency of separation further as the medium of fine coal pneumatic separation, and then providing high quality raw material for follow-up gasification.The spoil in fine coal and portion of water can be removed thus, and then unit consumption of energy and gas impurity in follow-up gasification can be reduced, improve gasification gas quality product.
According to a particular embodiment of the invention, described piece of cleaned coal shredder assembly 400 has block cleaned coal entrance 401 and the second powder cleaned coal outlet 402, and described piece of cleaned coal entrance 401 exports 202 with described block of cleaned coal and be connected.Thus, the block cleaned coal that the sorting of lump coal hot blast combined type sorting unit 200 obtains can be supplied in block cleaned coal shredder assembly 400 and carry out break process, to obtain powder cleaned coal.Thus, further the lump coal breaking being unsuitable for gasifying can be become fine coal, and then significantly improve and can improve the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal further, and then improve gasification gas productive rate.
According to a particular embodiment of the invention, the granularity of fine coal that obtains of fragmentation is lower than 6 millimeters.And then be more suitable for follow-up gasification process, the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal can be improved further, and then improve gasification gas productive rate.
According to a particular embodiment of the invention, described fine coal drying installation 500 has powder cleaned coal entrance 501, xeraphium cleaned coal outlet the 502, the 3rd hot-wind inlet 503 and the 3rd offgas outlet 504, and described powder cleaned coal entrance 501 exports 302 respectively and exports 402 with described second powder cleaned coal and be connected with described first powder cleaned coal.Thus, the powder cleaned coal that the powder cleaned coal that the sorting of fine coal hot-air flow sorting unit 300 can be obtained and block cleaned coal shredder assembly 400 break process obtain is supplied in fine coal drying installation 500, and adopt hot blast to carry out drying treatment, to obtain xeraphium cleaned coal and the 3rd tail gas.
Thus by the water ratio of the xeraphium cleaned coal that adopts above-mentioned fine coal drying installation 500 drying to obtain lower than 10 % by weight.And then drying treatment was carried out before gasification process is carried out to low-rank coal, gasification gas productive rate can be significantly improved.
According to a particular embodiment of the invention, described powder coal gasification furnace 600 has feeding mouth 601 and gasification gas outlet 602, and described feeding mouth 601 exports 502 with described xeraphium cleaned coal and is connected.Thus, the xeraphium cleaned coal that fine coal drying installation 600 drying obtains can be supplied in described powder coal gasification furnace 600 and gasify, to obtain the gas that gasifies.Thus, the powder cleaned coal that above-mentioned powder coal gasification furnace 600 is suitable for fine coal and the broken gained above-mentioned screening obtained carries out gasification process, thus can obtain the gas that gasifies.Contriver finds, by just lump coal separation, drying and dehydrating and bed pulverized coal gasification technology coupling, can improve the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal further, and then improves gasification gas productive rate.
According to a particular embodiment of the invention, carry out the temperature that gasifies in powder coal gasification furnace 600 and be not particularly limited, those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of gasification can be 800-1100 degree Celsius.
According to a particular embodiment of the invention, described waste-heat recovery device 700 has gasification gas entrance 701, cool gasification gas outlet 702 and heat outlet 703, described gasification gas entrance 701 exports 602 with described gasification gas and is connected, and described heat outlet 703 is connected with described 3rd hot-wind inlet 503 with the first hot-wind inlet 203, described second hot-wind inlet 303 respectively.Thus, the gasification gas produced in powder coal gasification furnace 600 can be supplied in described waste-heat recovery device 700 and carry out waste heat recovery processing, to produce hot gas, and described hot gas is returned respectively in lump coal hot blast combined type sorting unit 200, fine coal hot-air flow sorting unit 300 and fine coal drying installation 500 and use as hot blast.
According to a particular embodiment of the invention, waste-heat recovery device 700 can be reclaimed thermogenetic hot gas more than gasification gas to be divided into two portions and to utilize, wherein a road hot gas first mixes with normal temperature air, mixing after heat airflow temperature-control, at 100-130 degree Celsius, returns in lump coal hot blast combined type sorting unit 200 and fine coal hot-air flow sorting unit 300 as separating medium after the voltage stabilizing of voltage stabilizing bag; An other road hot air temperature controls at 100-200 degree Celsius, returns in fine coal drying installation 500 as drying medium after the voltage stabilizing of voltage stabilizing bag.Energy consumption can be saved further thus.
According to a particular embodiment of the invention, as shown in Figure 2, the system of above-mentioned process low-rank coal comprises further: cleaning apparatus 800, described cleaning apparatus 800 has gas inlet 801, dust outlet 802 and pneumatic outlet 803, and described gas inlet 801 is connected with the 3rd offgas outlet 504 with the first offgas outlet 204, second offgas outlet 304 respectively.Environmental pollution can be reduced thus.
According to another aspect of the present invention, the present invention proposes a kind of method processing low-rank coal.According to embodiments of the invention, the method adopts the system of process low-rank coal described above to carry out.According to a particular embodiment of the invention, the method comprises:
(1) described low-rank coal is supplied in described screening plant carry out screening process, to obtain lump coal and fine coal respectively;
(2) described lump coal is supplied in described lump coal hot blast combined type sorting unit, and adopts hot blast to carry out sorting process to described lump coal, to obtain block cleaned coal and the first tail gas;
(3) described fine coal is supplied in described fine coal hot-air flow sorting unit, and adopts hot blast to carry out pneumatic separation process to described fine coal, to obtain the first powder cleaned coal and the second tail gas;
(4) described block of cleaned coal is supplied in described piece of cleaned coal shredder assembly carries out break process, to obtain the second powder cleaned coal;
(5) described first powder cleaned coal and described second powder cleaned coal are supplied in described fine coal drying installation, and adopt hot blast to carry out drying treatment, to obtain xeraphium cleaned coal and the 3rd tail gas;
(6) described xeraphium cleaned coal is supplied in described powder coal gasification furnace gasifies, to obtain the gas that gasifies;
(7) described gasification gas is supplied in described waste-heat recovery device carries out waste heat recovery processing, to produce hot gas, and by described hot gas, return step (2), step (3) and step (5) respectively and use as described hot blast.
Thus, classification, sorting and bed pulverized coal gasification technology are coupled by the method according to the process low-rank coal of the embodiment of the present invention, waste-heat recovery device is adopted to reclaim the waste heat of gasification gas as sorting and drying medium, reduce system energy consumption and running cost, reduce environmental pollution, meanwhile, the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal is improved.Raw coal falls through dehydration the dirt content that can reduce in the energy consumption of gasification and product that carries out again gasifying after ash process.Particularly, lump coal, the efficiency of separation of fine coal and dehydration rate can be improved by the hot gas flow classification and sorting of raw coal in this system; Lump coal carries out crushing energy again and reduces comminution energy conssumption after sorting process; The contact area of lump coal fine coal and drying medium after fragmentation increases, and drying efficiency improves; Raw coal, after sorting discharge refuse, decreases unit consumption of energy and the gasification gas impurity of gasification.
Method below with reference to the process low-rank coal of Fig. 3-4 pairs of embodiment of the present invention is described in detail.According to embodiments of the invention, the method comprises:
S100: low-rank coal is supplied in screening plant and carries out screening process
According to a particular embodiment of the invention, low-rank coal is supplied in described screening plant and carries out screening process, to obtain lump coal and fine coal respectively.The granularity of the lump coal that above-mentioned screening obtains is not less than 6 millimeters, and the granularity of fine coal is lower than 6 millimeters.Directly the fine coal of this granularity can be supplied in powder coal gasification furnace 600 thus and carry out gasification process, and the lump coal of greater particle size is gasified after follow-up fragmentation again, thus the waste of gasification medium-sized coal can be avoided, and then can raw material availability be improved.
S200: lump coal is supplied in lump coal hot blast combined type sorting unit and adopts hot blast to carry out sorting process
According to a particular embodiment of the invention, lump coal is supplied in described lump coal hot blast combined type sorting unit, and adopts hot blast to carry out sorting process to lump coal, to obtain block cleaned coal and the first tail gas.Thus, by adopting lump coal hot blast combined type sorting unit can improve the efficiency of separation and lump coal purity further, and then provide high quality raw material for follow-up gasification.In addition, spoil in raw coal and the outer water of part can be removed through sorting, the block cleaned coal hardness obtained after sorting reduction, and then the comminution energy conssumption to block cleaned coal can be saved.
According to one embodiment of present invention, the temperature of the hot blast adopted in lump coal hot blast combined type sorting unit is also not particularly limited, those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of hot blast can be 100-130 degree Celsius.
According to still a further embodiment, the flow velocity of the hot blast adopted in lump coal hot blast combined type sorting unit is also not particularly limited, those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the flow velocity of hot blast can be 9-24m/s.Contriver finds, use the hot blast of this flow rates effectively sorting can remove the spoil in lump coal, and the moisture on low-rank coal surface can be taken away, reduce the bonding probability of (especially between cleaned coal and spoil) between particle in discharge refuse process, thus improve quality and the productive rate of follow-up gasification product while improving sorting discharge refuse efficiency.
S300: fine coal is supplied in fine coal hot-air flow sorting unit and adopts hot blast to carry out pneumatic separation process
According to a particular embodiment of the invention, fine coal is supplied in fine coal hot-air flow sorting unit, and adopts hot blast to carry out pneumatic separation process to fine coal, to obtain the first powder cleaned coal and the second tail gas.The spoil in fine coal and portion of water can be removed thus, and then unit consumption of energy and gas impurity in follow-up gasification can be reduced, improve gasification gas quality product.
According to one embodiment of present invention, the temperature of the hot blast adopted in fine coal hot-air flow sorting unit is also not particularly limited, those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of hot blast can be 100-130 degree Celsius.
According to still a further embodiment, the flow velocity of the hot blast adopted in fine coal hot-air flow sorting unit is also not particularly limited, those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the flow velocity of hot blast can be 4-9m/s.Contriver finds, use the hot blast of this flow rates effectively sorting can remove the spoil in fine coal, and the moisture on low-rank coal surface can be taken away, reduce the bonding probability of (especially between cleaned coal and spoil) between particle in discharge refuse process, thus improve quality and the productive rate of follow-up gasification product while improving sorting discharge refuse efficiency.
S400: block cleaned coal is supplied in described piece of cleaned coal shredder assembly and carries out break process
According to a particular embodiment of the invention, described block of cleaned coal is supplied in described piece of cleaned coal shredder assembly and carries out break process, to obtain the second powder cleaned coal.Thus, further the lump coal breaking being unsuitable for gasifying can be become fine coal, and then significantly improve and can improve the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal further, and then improve gasification gas productive rate.
According to a particular embodiment of the invention, the granularity of fine coal that obtains of fragmentation is lower than 6 millimeters.And then be more suitable for follow-up gasification process, the effective rate of utilization of low-rank coal and the transformation efficiency of low-rank coal can be improved further, thus reduce raw materials cost further, improve gasification gas productive rate.
S500: the first powder cleaned coal and the second powder cleaned coal are supplied in described fine coal drying installation and adopt hot blast to carry out drying treatment
According to a particular embodiment of the invention, the first powder cleaned coal and the second powder cleaned coal are supplied in fine coal drying installation, and adopt hot blast to carry out drying treatment, to obtain xeraphium cleaned coal and the 3rd tail gas.
According to a particular embodiment of the invention, drying treatment adopts the temperature of hot blast can be 100-200 degree Celsius, can improve drying efficiency further thus.According to a particular embodiment of the invention, above-mentioned drying treatment adopts the gas velocity of hot blast can be 0.1-0.5m/s.Drying efficiency can be improved further thus.
According to a particular embodiment of the invention, the water ratio of the xeraphium cleaned coal obtained through above-mentioned drying treatment is lower than 10 % by weight.Gasification efficiency can be improved further thus.Contriver finds, by carrying out the dry moisture reducing gasification of coal to powder cleaned coal, reduces the dehydration energy of gasification, thus improves the quality of gasification gas, improves gasification gas productive rate.
S600: xeraphium cleaned coal is supplied in powder coal gasification furnace and gasifies
According to a particular embodiment of the invention, xeraphium cleaned coal is supplied in powder coal gasification furnace and gasifies, to obtain the gas that gasifies.According to the granularity of the xeraphium cleaned coal be supplied in powder coal gasification furnace of the present invention lower than 6 millimeters.Can significantly reduce gasification energy consumption thus, improve gasification efficiency.
According to a particular embodiment of the invention, carry out the temperature that gasifies in vapourizing furnace and be not particularly limited, being specifically as follows 800-1100 degree Celsius.Gasification efficiency can be improved further thus.
S700: gasification gas is supplied in waste-heat recovery device and carries out waste heat recovery processing
According to a particular embodiment of the invention, gasification gas is supplied in described waste-heat recovery device and carries out waste heat recovery processing, to produce hot gas, and by hot gas, return step S200, step S300 and step S500 respectively and use as hot blast.
According to a particular embodiment of the invention, thermogenetic hot gas more than waste-heat recovery device recovery gasification gas can be divided into two portions to utilize, wherein a road hot gas first mixes with normal temperature air, mixing after heat airflow temperature-control, at 100-130 degree Celsius, returns in lump coal hot blast combined type sorting unit and fine coal hot-air flow sorting unit as separating medium after the voltage stabilizing of voltage stabilizing bag; An other road hot air temperature controls at 100-200 degree Celsius, returns in fine coal drying installation as drying medium after the voltage stabilizing of voltage stabilizing bag.Energy consumption can be saved further thus.
With reference to figure 4, the method according to the process low-rank coal of the embodiment of the present invention comprises further:
S800: the tail gas produced in step S200, S300 and S500 is supplied in cleaning apparatus and carries out dust removal process
By carrying out dust removal process to the tail gas of discharging in fine coal drying installation in fine coal hot-air flow sorting unit 300 in step S200 medium-sized coal hot blast combined type sorting unit, step S300 and step S500 in cleaning apparatus, environmental pollution can be reduced thus.
The system and method for the process low-rank coal of the above embodiment of the present invention at least has one of following effect:
(1) system and method for the process low-rank coal of the embodiment of the present invention is by integrated to low order coal grading, sorting, drying, gasification technology, reduce the energy consumption of gasification, simultaneously, the waste heat that ingenious applying powder gasification produces, adopt waste heat boiler to reclaim the waste heat of gasification gas as sorting and drying medium, reduce system energy consumption and running cost, reduce environmental pollution, meanwhile, effective rate of utilization and the low-rank coal transformation efficiency of low-rank coal is improved.
(2) system and method for the process low-rank coal of the embodiment of the present invention achieves predrying and sorting integrated, the dirts such as the spoil in coal are removed by dry separation, after the sorting of low-rank coal hot gas flow removes surface-moisture, reduce the bonding probability of (especially between cleaned coal and spoil) between particle in assorting room, to solve under normal temperature in low-rank coal combined type assorting room because the adhesion between particle causes a difficult problem for discharge refuse weak effect.
(3) system and method for the process low-rank coal of the embodiment of the present invention is by carrying out stage treatment to raw coal, respectively sorting is carried out to lump coal and fine coal, the size range of sorting narrows, sharpness of separation improves, spoil rate of discharge improves, treatment capacity that is dry and gasification is large, improves caloric power of gas, reduces ash, sulphur impurity content.
(4) system and method for the process low-rank coal of the embodiment of the present invention is by carrying out the process of wholegrain level discharge refuse to raw coal, solves low-rank coal directly as problems such as during gasified raw material, the calorific value of coal gas are low, ash content is high, heat utilization efficiency is low.
Embodiment
As shown in Figures 2 and 4, process low-rank coal, the analytical results of low-rank coal character is as shown in table 1.
Concrete steps comprise:
1), first raw coal sends into screening plant 100 by run coal bin by belt and feeder.Classified rear granularity carries out sorting for+6mm screen overflow feeds lump coal hot blast combined type sorting unit 200 by belt, control hot stream temperature 110 DEG C, upstream speed 18.32m/s, sorting cleaned coal is crushed to below-6mm in block cleaned coal shredder assembly 400, obtains powder cleaned coal; Classified rear granularity carries out sorting for-6mm screen underflow feeds fine coal air-classifier 300 by belt, and control hot stream temperature 105 DEG C, upstream speed 7.33m/s, obtains powder cleaned coal.With the separating medium of the hot gas flow of outer confession as raw coal when just starting.
2) obtain in above-mentioned steps two batches of powder cleaned coal are fed fine coal drying installation 500 by belt and carry out drying treatment, hot stream temperature is at 180 DEG C, and the moisture of the dry fine coal of gas velocity 0.27m/s is 7.64%; With the drying medium of the superheated vapour of outer confession as fine coal when just starting.
3) feed in powder coal gasification furnace 600 by the xeraphium cleaned coal that the drying in fine coal drying installation 500 obtains, by 950 DEG C of gasifications, vaporized chemical is oxygen/steam, pressure 0.10MPa, and gasification gas enters waste heat boiler 700 recovery waste heat, produces superheated vapour.
4) waste heat boiler 700 is reclaimed thermogenetic hot gas more than gasification gas to be divided into two portions and to utilize, wherein a road hot gas first mixes with normal temperature air, mixing after heat airflow temperature-control, at 100-130 degree Celsius, returns in lump coal hot blast combined type sorting unit 200 and fine coal hot-air flow sorting unit 300 as separating medium after the voltage stabilizing of voltage stabilizing bag; An other road hot air temperature controls at 100-200 degree Celsius, returns in fine coal drying installation 500 as drying medium after the voltage stabilizing of voltage stabilizing bag.
5) tail gas produced in lump coal hot blast combined type sorting unit 200, fine coal air-classifier 300 and fine coal drying installation 500 is supplied in cleaning apparatus 800 and carries out dust removal process.
The analytical results of the moisture of pending low-rank coal, ash content, sulphur content, calorific value is as shown in table 1, and the analytical results of the moisture of the fine coal before namely dried fine coal gasify, ash content, sulphur content, calorific value is as shown in table 2, and the gas composition obtained is as shown in table 3.
Adopt the method low-rank coal treatment capacity of the present embodiment can reach 300,000 tons/year, process size range is full particle size fraction, and the full water of low-rank coal is 28.72wt%.
Table 1: the analytical results of pending raw coal character
| Moisture (wt%) | Ash content (wt%) | Sulphur content (wt%) | Lower heat value (kcal/kg) |
| M t | A ad | S t,ad | Q net,v,ad |
| 28.72 | 21.55 | 1.21 | 3205.02 |
Table 2: the analytical results of coal character before gasification
| Moisture (wt%) | Ash content (wt%) | Sulphur content (wt%) | Lower heat value (kcal/kg) |
| M t | A ad | S t,ad | Q net,v,ad |
| 7.64 | 13.77 | 0.76 | 5788.51 |
Table 3: gas composition result (V%)
| CO | H 2 | CH 4 | CO 2 | N 2 |
| 42.13 | 34.61 | 3.18 | 18.92 | 1.16 |
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term need not for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. process a system for low-rank coal, it is characterized in that, comprising:
Screening plant, described screening plant has low-rank coal entrance, lump coal outlet and fine coal outlet;
Lump coal hot blast combined type sorting unit, described lump coal hot blast combined type sorting unit has lump coal entrance, the outlet of block cleaned coal, the first hot-wind inlet and the first offgas outlet, and described lump coal entrance exports with described lump coal and is connected;
Fine coal hot-air flow sorting unit, described fine coal hot-air flow sorting unit has fine coal entrance, the first powder cleaned coal outlet, the second hot-wind inlet and the second offgas outlet, and described fine coal entrance exports with described fine coal and is connected;
Block cleaned coal shredder assembly, described piece of cleaned coal shredder assembly has block cleaned coal entrance and the outlet of the second powder cleaned coal, and described piece of cleaned coal entrance exports with described block of cleaned coal and be connected;
Fine coal drying installation, described fine coal drying installation has powder cleaned coal entrance, the outlet of xeraphium cleaned coal, the 3rd hot-wind inlet and the 3rd offgas outlet, and described powder cleaned coal entrance exports with described first powder cleaned coal respectively to export with described second powder cleaned coal and is connected;
Powder coal gasification furnace, described powder coal gasification furnace has feeding mouth, the outlet of gasification gas and slag-drip opening, and described feeding mouth exports with described xeraphium cleaned coal and is connected; And
Waste-heat recovery device, described waste-heat recovery device has gasification gas entrance, the outlet of cool gasification gas and heat outlet, described gasification gas entrance exports with described gasification gas and is connected, and described heat outlet is connected with described 3rd hot-wind inlet with described first hot-wind inlet, described second hot-wind inlet respectively.
2. the system of process low-rank coal according to claim 1, is characterized in that, comprise further:
Cleaning apparatus, described cleaning apparatus has gas inlet, dust outlet and pneumatic outlet, and described gas inlet is connected with described 3rd offgas outlet with described first offgas outlet, described second offgas outlet respectively.
3. adopt a method for the system process low-rank coal of the process low-rank coal described in claim 1 or 2, it is characterized in that, comprising:
(1) described low-rank coal is supplied in described screening plant carry out screening process, to obtain lump coal and fine coal respectively;
(2) described lump coal is supplied in described lump coal hot blast combined type sorting unit, and adopts hot blast to carry out sorting process to described lump coal, to obtain block cleaned coal and the first tail gas;
(3) described fine coal is supplied in described fine coal hot-air flow sorting unit, and adopts hot blast to carry out pneumatic separation process to described fine coal, to obtain the first powder cleaned coal and the second tail gas;
(4) described block of cleaned coal is supplied in described piece of cleaned coal shredder assembly carries out break process, to obtain the second powder cleaned coal;
(5) described first powder cleaned coal and described second powder cleaned coal are supplied in described fine coal drying installation, and adopt hot blast to carry out drying treatment, to obtain xeraphium cleaned coal and the 3rd tail gas;
(6) described xeraphium cleaned coal is supplied in described powder coal gasification furnace gasifies, to obtain the gas that gasifies;
(7) described gasification gas is supplied in described waste-heat recovery device carries out waste heat recovery processing, to produce hot gas, and described hot gas is returned respectively step (2), step (3) and step (5) and use as described hot blast.
4. method according to claim 3, is characterized in that, comprises further:
(8) the 3rd tail gas produced in the second tail gas produced in the first tail gas produced in step (2), step (3) and step (5) is supplied in described cleaning apparatus carries out dust removal process.
5. method according to claim 3, is characterized in that, the granularity of described lump coal is for being not less than 6 millimeters, and the granularity of described fine coal is lower than 6 millimeters.
6. method according to claim 3, is characterized in that, the granularity of described xeraphium cleaned coal is lower than 6 millimeters.
7. method according to claim 3, is characterized in that, in step (2), the hot blast that employing gas flow temperature is 100-130 degree Celsius is 9-24m/s with upstream speed carries out described sorting process;
In step (3), the hot blast that employing gas flow temperature is 100-130 degree Celsius is 4-9m/s with upstream speed carries out described pneumatic separation process.
8. method according to claim 3, is characterized in that, in step (5), adopts temperature to be 100-200 degree Celsius and carries out described drying treatment with gas velocity 0.1-0.5m/s hot blast.
9. method according to claim 3, is characterized in that, the water ratio of described xeraphium cleaned coal is lower than 10 % by weight.
10. method according to claim 3, is characterized in that, in step (6), the temperature of described gasification is 800-1100 degree Celsius.
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| WO2019238020A1 (en) * | 2018-06-14 | 2019-12-19 | 中国矿业大学 | Method and process for quality improvement by means of optimally cooperating brown coal drying and dry separation method and process |
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| US4007019A (en) * | 1975-12-22 | 1977-02-08 | Texaco Inc. | Production of clean synthesis or fuel gas |
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