CN102766475B - 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 PDF

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CN102766475B
CN102766475B CN201210233250.0A CN201210233250A CN102766475B CN 102766475 B CN102766475 B CN 102766475B CN 201210233250 A CN201210233250 A CN 201210233250A CN 102766475 B CN102766475 B CN 102766475B
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fluidized bed
coal
horizontal
steam boiler
overheating steam
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CN102766475A (en
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李爱蓉
吴道洪
王其成
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Shenwu Technology Group Corp Co Ltd
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Beijing Shenwu Environmental and Energy Technology Co Ltd
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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

A kind of fluid bed powder coal based on superheated vapo(u)r medium is dry, method for destructive distillation and system
Technical field
The present invention relates to technical field of coal chemical industry, be specifically related to that a kind of fluid bed powder coal based on superheated vapo(u)r medium is dry, method for destructive distillation and system.
Background technology
Along with the raising of technology, the low rotten fine coal in the coal in China place of production rolls up, but due to the restriction of existing coal conversion technology, a lot of fine coal resources cannot be utilized.Low rotten fine coal has that moisture is large, particle diameter is little conventionally, and chemical reactivity is good, inflammable frangible, and the features such as the high and low calorific value of ash content are unsuitable for long distance transportation and long-time storage; 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 pollution.Therefore dry, the destructive distillation upgrading technology of, developing low rotten fine coal be solve that coal resources are efficient, one of the important channel of clean utilization.
Although the existing research for many years of the dry technology of coal, still there are a lot of problems in existing industrialization and accurate industrialized technology.As: power consumption and the maintenance cost of coal high temperature flue gas tube type drying technology are higher, and coal dust directly contacts and has certain potential safety hazard with flue gas.And pipe drier taking superheated vapo(u)r as drying medium exists single device drying power little, caliber is thin, easily stops up, and invests highly, pollutes the problem such as large and fails large-scale promotion.
Coal carbonization is the committed step that the clean Efficient Conversion of coal utilizes.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, coal treatment capacity is little, and liquid state and gaseous state products collection efficiency are low.As: in the tar that the destructive distillation of fine coal ebullated bed gas retort obtains, dust content is high, and dry distillation gas calorific value is low; Air-flow internally heated retort oven requires raw coal lumpiness between 20~80mm, the poor thermal conductivity of lump coal, and bed permeability is bad, is heated inhomogeneous, and the tar yield that destructive distillation obtains is low, and semicoke quality is inhomogeneous; And vertical gas retort destructive distillation institute heat requirement imports into by heating furnace wall, thermo-efficiency is low.Therefore ripe dry distillation of coal technology that up to the present also really can large-scale promotion, particularly for 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 that is applicable to high-moisture, low rotten fine coal of operational safety and horizontal multi-cell fluidized bed method for destructive distillation and system.
The object of the invention is to be achieved through the following technical solutions:
Fluid bed powder coal based on superheated vapo(u)r medium is dried, a method for destructive distillation, comprises the following steps:
(1) by after feed coal fragmentation, deliver to vibra fluidized bed drying equipment by worm conveyor;
(2) superheated vapo(u)r is made to drying medium, by porous plate, fine coal is carried out to heat drying, the fine coal that superheated vapo(u)r is carried secretly enters horizontal multi-cell fluidized bed gas retort after cyclonic separator filters;
(3) dried fine coal is delivered in horizontal multi-cell fluidized bed gas retort, the superheated vapo(u)r entering after filtration is made fluidizing medium, by porous plate, fine coal is carried out to low-temperature pyrolysis;
(4) it is cooling that the high temperature carbonization gas that destructive distillation produces is delivered to oil gas cooling separation after by primary cyclone and secondary cyclone dedusting, and cooled oil-water mixture is delivered to water-and-oil separator again and carried out oily water separation;
(5) semicoke that horizontal multi-cell fluidized bed gas retort discharge port is discharged is delivered to quench system and is stored after cooling;
(6) coal gas producing with fine coal destructive distillation uses as the heating fuel of cryogenic overheating steam boiler and hyperthermia and superheating steam boiler, and the superheated vapo(u)r of the differing temps that cryogenic overheating steam boiler and hyperthermia and superheating steam boiler produce is delivered to respectively vibra fluidized bed drying equipment and carried out the dry and horizontal multi-cell fluidized bed gas retort of fine coal and carry out fine coal low-temperature pyrolysis.
Fine coal can broken sieve into the particle of particle diameter≤6mm before dry.
Superheated vapo(u)r temperature is 120-300 DEG C in described step (2), constant pressure and dry, time of drying 5-20 minute.
In described step (3), superheated vapo(u)r charging temperature is 550-650 DEG C, and in gas retort, temperature is 500-600 DEG C, and pressure is 0.01-1.0Mpa, 5~30 minutes destructive distillation time.
To fine coal, destructive distillation provides heat by radiative transfer mode in described horizontal multi-cell fluidized bed, to be provided with heater.
The system used according to aforesaid method, comprise 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, described crusher 1 connects vibra fluidized bed drying equipment 3 successively, cyclonic separator 4; Described cyclonic separator 4 outlets export and are jointly connected successively horizontal multi-cell fluidized bed gas retort 5, primary cyclone 6, secondary cyclone 7, oil gas cooling separation 8, water-and-oil separator 9 with vibra fluidized bed drying equipment 3; Described oil gas cooling separation 8 gas outlets connect respectively hyperthermia and superheating steam boiler 12 and cryogenic overheating steam boiler 11, described hyperthermia and superheating steam boiler 12 connects horizontal multi-cell fluidized bed gas retort 5, described cryogenic overheating steam boiler 11 connects vibra fluidized bed drying equipment 3, and described horizontal multi-cell fluidized bed gas retort 5 solids outlets connect quench system 10.
Interior at least one heater that arranges of described horizontal multi-cell fluidized bed gas retort 5.
Worm conveyor 2 also can be set, to connect crusher 1 and vibra fluidized bed drying equipment 3.
Fluid bed powder coal based on superheated vapo(u)r medium provided by the invention is dry, method for destructive distillation, has following beneficial effect: fine coal directly contacts with superheated vapo(u)r, and heat transfer efficiency is high, and 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 content of dry rear fine coal is low and even; Adopt superheated vapo(u)r as fluidizing medium, can improve to a certain extent quality of coke tar and productive rate that pulverized coal pyrolysis produces, semicoke quality is even, C in coal gas 2the content of above alkane, alkene and alkynes is high, and calorific value is large; In horizontal multi-cell fluidized bed, be provided with interior heater, can improve the thermo-efficiency of fine coal destructive distillation, reduce superheated vapo(u)r consumption little, reduce energy consumption.Whole system combines the dry and destructive distillation of fine coal, and technical process is simple, oxygen-free environment, operational safety.
Brief description of the drawings
Fig. 1 is that the fluid bed powder coal that the present invention is based on superheated vapo(u)r medium is dried, the process flow sheet of distillation system.
In 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 boilers; 12. hyperthermia and superheating steam boilers
Embodiment
For better explanation the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
Embodiment 1: as shown in Figure 1, the fine coal treatment capacity of the present embodiment is 0.5t/h, is about 2.0mm with median size, and the brown coal that moisture as received coal content is 20% are raw material, and embodiment comprises the processing step of following order:
(1) brown coal raw coal is crushed to particle diameter below 3mm through crusher 1, then delivers to vibrated fluidized bed 3 inner dryings by worm conveyor 2;
(2) brown coal uniform particles is distributed on the Porous Base of vibrated fluidized bed 3, and superheated vapo(u)r carries out heat drying by 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 vibrated fluidized bed 3 interior superheated vapo(u)rs is 200 DEG C, and the residence time of brown coal in vibrated fluidized bed 3 is 15min, and outlet brown coal moisture content is below 10%.Together with 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, deliver to horizontal multi-cell fluidized bed gas retort 5 and carry out low-temperature pyrolysis.
(3) dried fine coal is evenly distributed on the Porous Base in horizontal multi-cell fluidized bed gas retort 5, superheated vapo(u)r, is provided with interior heater and heats pulverized coal particle by radiative transfer mode even fine coal fluidisation by porous plate in stove, coal particle diameter is little, temperature rise rate is fast, pyrolysis rapidly.The charging temperature of superheated vapo(u)r is 600 DEG C, and pyrolysis temperature is 550 DEG C, and pressure maintains 0.1Mpa, and the destructive distillation time is 20min.
(4) to deliver to oil gas cooling separation 8 after by primary cyclone 6 and secondary cyclone 7 dedustings cooling for high temperature carbonization gas, cooled oil-water mixture is delivered to water-and-oil separator 9 again and is carried out oily water separation, finally obtains the clean gas that finished product tar and calorific value are higher.The semicoke that horizontal multi-cell fluidized bed gas retort 5 discharge ports are discharged is delivered to quench system 10 and is stored after cooling.
(5) coal gas producing with fine coal destructive distillation uses as the heating fuel of cryogenic overheating steam boiler 11 and hyperthermia and superheating steam boiler 12,200 DEG C of superheated vapo(u)rs that cryogenic overheating steam boiler 11 produces are delivered to vibra fluidized bed drying equipment 3, and to carry out fine coal dry, and 600 DEG C of superheated vapo(u)rs that hyperthermia and superheating steam boiler 12 produces enter horizontal multi-cell fluidized bed gas retort 5 and carry out fine coal low-temperature pyrolysis.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in 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 (4)

1. a, method for destructive distillation dry based on the fluid bed powder coal of superheated vapo(u)r medium, is characterized in that, comprises the following steps:
(1) by after feed coal fragmentation, deliver to vibra fluidized bed drying equipment by worm conveyor;
(2) superheated vapo(u)r is made to drying medium, by porous plate, fine coal is carried out to heat drying, the fine coal that superheated vapo(u)r is carried secretly enters horizontal multi-cell fluidized bed gas retort after cyclonic separator filters;
(3) dried fine coal is delivered in horizontal multi-cell fluidized bed gas retort, the superheated vapo(u)r entering after filtration is made fluidizing medium, by porous plate, fine coal is carried out to low-temperature pyrolysis;
(4) it is cooling that the high temperature carbonization gas that destructive distillation produces is delivered to oil gas cooling separation after by primary cyclone and secondary cyclone dedusting, and cooled oil-water mixture is delivered to water-and-oil separator again and carried out oily water separation;
(5) semicoke that horizontal multi-cell fluidized bed gas retort discharge port is discharged is delivered to quench system and is stored after cooling;
(6) coal gas producing with fine coal destructive distillation uses as the heating fuel of cryogenic overheating steam boiler and hyperthermia and superheating steam boiler, the superheated vapo(u)r that cryogenic overheating steam boiler produces is delivered to vibra fluidized bed drying equipment, and to carry out fine coal dry, and the superheated vapo(u)r that hyperthermia and superheating steam boiler produces is delivered to horizontal multi-cell fluidized bed gas retort and carried out fine coal low-temperature pyrolysis;
Wherein, in the described horizontal multi-cell fluidized bed of step (2), (3), (5), (6), heater is set, by radiative transfer mode, to fine coal, destructive distillation provides heat;
The described pulverized coal particle particle diameter of step (1) is be crushed to≤6mm before dry;
Described in step (2), superheated vapo(u)r temperature is 120-300 DEG C, constant pressure and dry, time of drying 5-20 minute;
Described in step (3), superheated vapo(u)r charging temperature is 550-650 DEG C, and in gas retort, temperature is 500-600 DEG C, and pressure is 0.01-1.0Mpa, destructive distillation time 5-30 minute.
2. dry, the method for destructive distillation system used of the fluid bed powder coal based on superheated vapo(u)r medium claimed in claim 1, it is characterized in that, comprise 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, described crusher (1) connects vibra fluidized bed drying equipment (3) successively, cyclonic separator (4); Described 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 described oil gas cooling separation (8) gas connects respectively hyperthermia and superheating steam boiler (12) and cryogenic overheating steam boiler (11), described hyperthermia and superheating steam boiler (12) connects horizontal multi-cell fluidized bed gas retort (5), described cryogenic overheating steam boiler (11) connects vibra fluidized bed drying equipment (3), and the outlet of described horizontal multi-cell fluidized bed gas retort (5) solids connects quench system (10).
3. dry, the method for destructive distillation system used of the fluid bed powder coal based on superheated vapo(u)r medium according to claim 2, is characterized in that, in described horizontal multi-cell fluidized bed gas retort (5), one or more heaters is set.
4. dry, the method for destructive distillation system used of the fluid bed powder coal based on superheated vapo(u)r medium according to claim 2, is characterized in that, also comprises worm conveyor (2), to connect crusher (1) and vibra fluidized bed drying equipment (3).
CN201210233250.0A 2012-07-05 2012-07-05 Method and system for performing drying and dry distillation on fluidized bed pulverized coal based on overheating steam medium Active CN102766475B (en)

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