CN102766475A - Method and system for performing drying and dry distillation on fluidized bed pulverized coal based on overheating steam medium - Google Patents
Method and system for performing drying and dry distillation on fluidized bed pulverized coal based on overheating steam medium Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 81
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000013021 overheating Methods 0.000 title claims abstract description 21
- 238000010980 drying distillation Methods 0.000 title abstract 2
- 238000001035 drying Methods 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 238000010791 quenching Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000446 fuel Substances 0.000 claims abstract description 4
- 206010020843 Hyperthermia Diseases 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 13
- 230000036031 hyperthermia Effects 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 235000019198 oils Nutrition 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 238000003763 carbonization Methods 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 3
- 238000013467 fragmentation Methods 0.000 claims description 3
- 238000006062 fragmentation reaction Methods 0.000 claims description 3
- 235000019476 oil-water mixture Nutrition 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000000571 coke Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 230000000171 quenching effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 29
- 238000005516 engineering process Methods 0.000 description 9
- 239000003077 lignite Substances 0.000 description 6
- 239000011269 tar Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 235000019628 coolness Nutrition 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001345 alkine derivatives Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000011285 coke tar Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The invention provides a method and a system for performing drying and dry distillation on fluidized bed pulverized coal based on an overheating steam medium. The method comprises the following steps of: heating and drying pulverized coal by taking overheating steam as a drying medium, performing the dry distillation in a horizontal multichamber fluidized bed dry distillation furnace on the dried pulverized coal by utilizing the overheating steam as a fluidizing medium, dedusting high-temperature dry distillation gas by a cyclone separator, conveying the dedusted high-temperature dry distillation gas to an oil gas cooling separation system for cooling, and performing oil-water separation on the cooled mixture; conveying discharged semicoke to a coke quenching system, and cooling for storing; and allowing gas generated by the dry distillation to be used as heating fuel for a low-temperature overheating steam boiler and a high-temperature overheating steam boiler, and conveying the generated overheating steam to vibrated fluidized bed drying equipment and the horizontal multichamber fluidized bed dry distillation furnace. By the method and the system, the overheating steam is low in consumption and low in energy consumption, and the dried pulverized coal is low and uniform in moisture content; and the quality and yield of tar generated by the pyrolysis of the pulverized coal can be improved, a process is simple, and the system is operated safely in an anaerobic environment.
Description
Technical field
The present invention relates to technical field of coal chemical industry, be specifically related to a kind of fluid bed powder coal drying, method for destructive distillation and system based on the superheated vapo(u)r medium.
Background technology
Along with the raising of coal mining technology, the low rotten fine coal in the coal in China place of production rolls up, but because existing coal conversion technology limitation, a lot of fine coal resources can't be utilized.Low rotten fine coal has usually that moisture is big, particle diameter is little, and chemical reactivity is good, and is inflammable frangible, and characteristics such as the high and low calorific value of ash content are inappropriate for remote transportation and store with long-time; But the low rotten fine coal of the not upgrading of directly burning, not only efficiency of combustion is low, also can cause serious environmental to pollute.Therefore, drying, the destructive distillation upgrading technology of the low rotten fine coal of exploitation be solve that coal resources are efficient, one of the important channel of clean utilization.
Though the existing research for many years of the dry technology of coal, still there are a lot of problems in existing industriallization with accurate industrialized technology.As: the power consumption and the maintenance cost of coal high temperature flue gas tube type drying technology are higher, and coal dust directly contacts with flue gas and has certain potential safety hazard.And be that the pipe drier of drying medium exists the single device drying power little with the superheated vapo(u)r, caliber is thin, is prone to stop up, and investment is high, pollutes problem such as big and fails large-scale promotion.
Coal carbonization is the committed step of the clean efficient trans-utilization of coal.Existing dry distillation of coal technology majority is applicable to high-quality lump coal, and is not suitable for low rotten fine coal; The small scale of existing gas retort, the coal treatment capacity is little, and liquid state and gaseous product productive rate are low.As: dust content is high in the tar that the destructive distillation of fine coal liquid bed gas retort obtains, and the dry distillation gas calorific value is low; The air-flow internally heated retort oven then requires the raw coal lumpiness between 20～80mm, the poor thermal conductivity of lump coal, and bed permeability is bad, and it is inhomogeneous to be heated, and the tar yield that destructive distillation obtains is low, and the semicoke quality is inhomogeneous; And vertical gas retort destructive distillation institute heat requirement is imported into by the heating furnace wall, and thermo-efficiency is low.Therefore sophisticated dry distillation of coal technology that up to the present also really can large-scale promotion is particularly to the retorting technique of low rotten fine coal.
Summary of the invention
The object of the present invention is to provide a kind of technical process simple, oxygen-free environment, the vibra fluidized bed drying and the horizontal multi-cell fluidized bed method for destructive distillation and the system that are applicable to high-moisture, low rotten fine coal of operational safety.
The objective of the invention is to realize through following technical scheme:
Dry, the method for destructive distillation of a kind of fluid bed powder coal based on the superheated vapo(u)r medium comprises the following steps:
(1) with after the feed coal fragmentation, delivers to vibra fluidized bed drying equipment through worm conveyor;
(2) superheated vapo(u)r is made drying medium, through porous plate fine coal is carried out heat drying, the fine coal that superheated vapo(u)r is carried secretly gets into horizontal multi-cell fluidized bed gas retort after cyclonic separator filters;
(3) dried fine coal is delivered in the horizontal multi-cell fluidized bed gas retort, filtered the superheated vapo(u)r of back entering and make fluidizing medium, fine coal is carried out low-temperature pyrolysis through porous plate;
(4) the high temperature carbonization gas that produces of destructive distillation is delivered to the oil gas cooling separation after through primary cyclone and secondary cyclone dedusting and is cooled off, and cooled oil-water mixture is delivered to water-and-oil separator again and carried out oily water separation;
(5) semicoke of horizontal multi-cell fluidized bed gas retort discharge port discharge stores after delivering to the quench system cooling;
(6) coal gas that produces with the fine coal destructive distillation uses as the heating fuel of cryogenic overheating steam boiler and hyperthermia and superheating steam boiler, and the cryogenic overheating steam boiler delivers to respectively with the superheated vapo(u)r of the differing temps of hyperthermia and superheating steam boiler generation that vibra fluidized bed drying equipment carries out the fine coal drying and horizontal multi-cell fluidized bed gas retort carries out the fine coal low-temperature pyrolysis.
Fine coal can broken sieve into the particle of particle diameter≤6mm before dry.
The superheated vapo(u)r temperature is 120-300 ℃ in the said step (2), constant pressure and dry, 5-20 minute time of drying.
The superheated vapo(u)r charging temperature is 550-650 ℃ in the said step (3), and temperature is 500-600 ℃ in the gas retort, and pressure is 0.01-1.0Mpa, 5～30 minutes destructive distillation time.
Being provided with heater in the said horizontal multi-cell fluidized bed provides heat for the fine coal destructive distillation through the radiative transfer mode.
The system used according to aforesaid method comprises crusher 1, vibra fluidized bed drying equipment 3; Cyclonic separator 4, horizontal multi-cell fluidized bed gas retort 5, primary cyclone 6; Secondary cyclone 7, oil gas cooling separation 8, water-and-oil separator 9; Quench system 10, cryogenic overheating steam boiler 11, hyperthermia and superheating steam boiler 12; Wherein, said crusher 1 connects vibra fluidized bed drying equipment 3 successively, cyclonic separator 4; Said cyclonic separator 4 outlets are connected horizontal multi-cell fluidized bed gas retort 5, primary cyclone 6, secondary cyclone 7, oil gas cooling separation 8, water-and-oil separator 9 jointly successively with 3 outlets of vibra fluidized bed drying equipment; Said oil gas cooling separation 8 gas outlet connects hyperthermia and superheating steam boiler 12 and cryogenic overheating steam boiler 11 respectively; Said hyperthermia and superheating steam boiler 12 connects horizontal multi-cell fluidized bed gas retort 5; Said cryogenic overheating steam boiler 11 connects vibra fluidized bed drying equipment 3, and said horizontal multi-cell fluidized bed gas retort 5 solidss outlet connects quench system 10.
In the said horizontal multi-cell fluidized bed gas retort 5 at least one heater is set.
Also worm conveyor 2 can be set, to connect crusher 1 and vibra fluidized bed drying equipment 3.
Dry, the method for destructive distillation of fluid bed powder coal based on the superheated vapo(u)r medium provided by the invention, following beneficial effect is arranged: fine coal directly contacts with superheated vapo(u)r, and heat transfer efficiency is high, and the superheated vapo(u)r consumption is few, and energy consumption is low; The residence time of fine coal in vibra fluidized bed drying equipment is short, and the water cut of dry back fine coal is low and even; Adopt superheated vapo(u)r as fluidizing medium, can improve quality of coke tar and productive rate that pulverized coal pyrolysis produces to a certain extent, the semicoke quality is even, C in the coal gas
2The content of above alkane, alkene and alkynes is high, and calorific value is big; In horizontal multi-cell fluidized bed, be provided with the internal heating member, can improve the pyrogenous thermo-efficiency of fine coal, it is little to reduce the superheated vapo(u)r consumption, cuts down the consumption of energy.Total system combines the drying and the destructive distillation of fine coal, and technical process is simple, oxygen-free environment, operational safety.
Description of drawings
Fig. 1 is the fluid bed powder coal drying that the present invention is based on the superheated vapo(u)r medium, the process flow sheet of distillation system.
Among the figure: 1. crusher; 2. worm conveyor; 3. vibra fluidized bed drying equipment; 4. cyclonic separator; 5. horizontal multi-cell fluidized bed gas retort; 6. primary cyclone; 7. secondary cyclone; 8. oil gas cooling separation; 9. water-and-oil separator; 10. quench system; 11. cryogenic overheating steam boiler; 12. hyperthermia and superheating steam boiler
Embodiment
For better explanation the present invention,, the technical scheme in the embodiment of the invention is carried out clear, intactly description below in conjunction with the accompanying drawing in the embodiment of the invention.
Embodiment 1: as shown in Figure 1, the fine coal treatment capacity of present embodiment is 0.5t/h, is about 2.0mm with median size, and the as received basis moisture content is that 20% brown coal are raw material, and embodiment comprises the process step of following order:
(1) the brown coal raw coal is crushed to particle diameter below 3mm through crusher 1, delivers to vibrated fluidized bed 3 inner dryings through worm conveyor 2 again;
(2) the brown coal uniform particles is distributed on the Porous Base of vibrated fluidized bed 3, and superheated vapo(u)r carries out heat drying through porous plate to brown coal, and coal particle is even fluidisation under mechanical vibration force and superheated vapo(u)r effect, rapid drying.The charging temperature of superheated vapo(u)r is 200 ℃ in the vibrated fluidized bed 3, and the residence time of brown coal in vibrated fluidized bed 3 is 15min, and outlet brown coal moisture content is below 10%.The dry coal that the fine coal that superheated vapo(u)r is carried secretly is discharged with vibrated fluidized bed 3 discharge ports after cyclonic separator 4 filters is delivered to horizontal multi-cell fluidized bed gas retort 5 and is carried out low-temperature pyrolysis.
(3) dried fine coal is evenly distributed on the Porous Base in the horizontal multi-cell fluidized bed gas retort 5; Superheated vapo(u)r, is provided with the internal heating member and heats pulverized coal particle through the radiative transfer mode the even fluidisation of fine coal through porous plate in the stove, the coal particle diameter is little; Temperature rise rate is fast, pyrolysis rapidly.The charging temperature of superheated vapo(u)r is 600 ℃, and pyrolysis temperature is 550 ℃, and pressure maintains 0.1Mpa, and the destructive distillation time is 20min.
(4) high temperature carbonization gas is delivered to 8 coolings of oil gas cooling separation through after primary cyclone 6 and secondary cyclone 7 dedustings; Cooled oil-water mixture is delivered to water-and-oil separator 9 again and is carried out oily water separation, finally obtains the higher clean gas of finished product tar and calorific value.The semicoke that horizontal multi-cell fluidized bed gas retort 5 discharge ports are discharged stores after delivering to quench system 10 coolings.
(5) coal gas that produces with the fine coal destructive distillation uses as the heating fuel of cryogenic overheating steam boiler 11 and hyperthermia and superheating steam boiler 12; 200 ℃ of superheated vapo(u)rs that cryogenic overheating steam boiler 11 produces are delivered to vibra fluidized bed drying equipment 3 and are carried out the fine coal drying, and 600 ℃ of superheated vapo(u)rs that hyperthermia and superheating steam boiler 12 produces get into horizontal multi-cell fluidized bed gas retort 5 and carry out the fine coal low-temperature pyrolysis.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (8)
1. dry, the method for destructive distillation of the fluid bed powder coal based on the superheated vapo(u)r medium is characterized in that, comprises the following steps:
(1) with after the feed coal fragmentation, delivers to vibra fluidized bed drying equipment through worm conveyor;
(2) superheated vapo(u)r is made drying medium, through porous plate fine coal is carried out heat drying, the fine coal that superheated vapo(u)r is carried secretly gets into horizontal multi-cell fluidized bed gas retort after cyclonic separator filters;
(3) dried fine coal is delivered in the horizontal multi-cell fluidized bed gas retort, filtered the superheated vapo(u)r of back entering and make fluidizing medium, fine coal is carried out low-temperature pyrolysis through porous plate;
(4) the high temperature carbonization gas that produces of destructive distillation is delivered to the oil gas cooling separation after through primary cyclone and secondary cyclone dedusting and is cooled off, and cooled oil-water mixture is delivered to water-and-oil separator again and carried out oily water separation;
(5) semicoke of horizontal multi-cell fluidized bed gas retort discharge port discharge stores after delivering to the quench system cooling;
(6) coal gas that produces with the fine coal destructive distillation is as the heating fuel use of cryogenic overheating steam boiler and hyperthermia and superheating steam boiler; The superheated vapo(u)r that the cryogenic overheating steam boiler produces is delivered to vibra fluidized bed drying equipment and is carried out the fine coal drying, and the superheated vapo(u)r that the hyperthermia and superheating steam boiler produces is delivered to horizontal multi-cell fluidized bed gas retort and carried out the fine coal low-temperature pyrolysis.
2. dry, the method for destructive distillation of the fluid bed powder coal based on the superheated vapo(u)r medium according to claim 1 is characterized in that the particle of particle diameter≤6mm is sieved in fine coal fragmentation before dry.
3. dry, the method for destructive distillation of the fluid bed powder coal based on the superheated vapo(u)r medium according to claim 1 is characterized in that the superheated vapo(u)r temperature is 120-300 ℃ in the said step (2), constant pressure and dry, 5-20 minute time of drying.
4. dry, the method for destructive distillation of the fluid bed powder coal based on the superheated vapo(u)r medium according to claim 1; It is characterized in that the superheated vapo(u)r charging temperature is 550-650 ℃ in the said step (3), temperature is 500-600 ℃ in the gas retort; Pressure is 0.01-1.0Mpa, 5～30 minutes destructive distillation time.
5. dry, the method for destructive distillation of the fluid bed powder coal based on the superheated vapo(u)r medium according to claim 1 is characterized in that, heater is set in the said horizontal multi-cell fluidized bed heat is provided for the fine coal destructive distillation through the radiative transfer mode.
6. dry, the used system of method for destructive distillation of the fluid bed powder coal based on the superheated vapo(u)r medium according to claim 1 is characterized in that, comprises crusher (1); Vibra fluidized bed drying equipment (3), cyclonic separator (4), horizontal multi-cell fluidized bed gas retort (5); Primary cyclone (6), secondary cyclone (7), oil gas cooling separation (8); Water-and-oil separator (9); Quench system (10), cryogenic overheating steam boiler (11), hyperthermia and superheating steam boiler (12); Wherein, said crusher (1) connects vibra fluidized bed drying equipment (3) successively, cyclonic separator (4); Said cyclonic separator (4) outlet is connected horizontal multi-cell fluidized bed gas retort (5) jointly successively with vibra fluidized bed drying equipment (3) outlet; Primary cyclone (6); Secondary cyclone (7), oil gas cooling separation (8), water-and-oil separator (9); The outlet of said oil gas cooling separation (8) gas connects hyperthermia and superheating steam boiler (12) and cryogenic overheating steam boiler (11) respectively; Said hyperthermia and superheating steam boiler (12) connects horizontal multi-cell fluidized bed gas retort (5); Said cryogenic overheating steam boiler (11) connects vibra fluidized bed drying equipment (3), and the outlet of said horizontal multi-cell fluidized bed gas retort (5) solids connects quench system (10).
7. dry, the distillation system of the fluid bed powder coal based on the superheated vapo(u)r medium according to claim 6 is characterized in that, in the said horizontal multi-cell fluidized bed gas retort (5) at least one heater is set.
8. dry, the distillation system of the fluid bed powder coal based on the superheated vapo(u)r medium according to claim 6 is characterized in that, also comprises worm conveyor (2), to connect crusher (1) and vibra fluidized bed drying equipment (3).
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602360A (en) * | 2013-11-15 | 2014-02-26 | 华电电力科学研究院 | Device for drying and upgrading lignite fluidized bed and technology of device |
| WO2014139136A1 (en) * | 2013-03-13 | 2014-09-18 | Cai Jingpeng | Method for drying and low-temperature carbonization of lignite by steam heat conduction |
| CN104610989A (en) * | 2014-11-05 | 2015-05-13 | 神华集团有限责任公司 | Coal pyrolysis device |
| CN105570919A (en) * | 2016-01-27 | 2016-05-11 | 北京神雾环境能源科技集团股份有限公司 | System and method for treating low-rank coal |
| CN107158876A (en) * | 2017-07-18 | 2017-09-15 | 洛阳建材建筑设计研究院有限公司 | The production of hydrocarbons technique of high-temperature oil gas dust arrester after a kind of oil shale retorting |
| CN107903924A (en) * | 2017-11-21 | 2018-04-13 | 北京神雾电力科技有限公司 | A kind of uplink heat accumulating type fine coal fast pyrogenation reaction system and method |
| CN109652128A (en) * | 2018-11-30 | 2019-04-19 | 浙江天禄环境科技有限公司 | A kind of method and system using the volatile matter Liquefied Hydrocarbon in low-order coal |
| CN110079350A (en) * | 2019-05-30 | 2019-08-02 | 青岛科技大学 | It is a kind of using more warehouse fluidized-bed reactors as the biomass through pyrolysis production technology of core |
| CN113717795A (en) * | 2021-09-27 | 2021-11-30 | 南京林业大学 | Novel multifunctional steam distillation-dry distillation integrated equipment |
| WO2022041371A1 (en) * | 2020-08-27 | 2022-03-03 | 深圳市捷晶能源科技有限公司 | Pyrolysis treatment system and method |
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|---|---|---|---|---|
| WO2014139136A1 (en) * | 2013-03-13 | 2014-09-18 | Cai Jingpeng | Method for drying and low-temperature carbonization of lignite by steam heat conduction |
| CN103602360A (en) * | 2013-11-15 | 2014-02-26 | 华电电力科学研究院 | Device for drying and upgrading lignite fluidized bed and technology of device |
| CN103602360B (en) * | 2013-11-15 | 2016-01-20 | 华电电力科学研究院 | The device of brown coal fluidised bed drying and upgrading and technique thereof |
| CN104610989A (en) * | 2014-11-05 | 2015-05-13 | 神华集团有限责任公司 | Coal pyrolysis device |
| CN105570919A (en) * | 2016-01-27 | 2016-05-11 | 北京神雾环境能源科技集团股份有限公司 | System and method for treating low-rank coal |
| CN107158876A (en) * | 2017-07-18 | 2017-09-15 | 洛阳建材建筑设计研究院有限公司 | The production of hydrocarbons technique of high-temperature oil gas dust arrester after a kind of oil shale retorting |
| CN107903924A (en) * | 2017-11-21 | 2018-04-13 | 北京神雾电力科技有限公司 | A kind of uplink heat accumulating type fine coal fast pyrogenation reaction system and method |
| CN109652128A (en) * | 2018-11-30 | 2019-04-19 | 浙江天禄环境科技有限公司 | A kind of method and system using the volatile matter Liquefied Hydrocarbon in low-order coal |
| CN110079350A (en) * | 2019-05-30 | 2019-08-02 | 青岛科技大学 | It is a kind of using more warehouse fluidized-bed reactors as the biomass through pyrolysis production technology of core |
| CN110079350B (en) * | 2019-05-30 | 2021-08-03 | 青岛科技大学 | Biomass thermal cracking production process taking multi-chamber fluidized bed reactor as core |
| WO2022041371A1 (en) * | 2020-08-27 | 2022-03-03 | 深圳市捷晶能源科技有限公司 | Pyrolysis treatment system and method |
| CN113717795A (en) * | 2021-09-27 | 2021-11-30 | 南京林业大学 | Novel multifunctional steam distillation-dry distillation integrated equipment |
| CN113717795B (en) * | 2021-09-27 | 2023-11-28 | 南京林业大学 | Novel multifunctional steam distillation-dry distillation integrated equipment |
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