CN101608125B - Method for upgrading coal pyrolysis - Google Patents
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- CN101608125B CN101608125B CN200910089227A CN200910089227A CN101608125B CN 101608125 B CN101608125 B CN 101608125B CN 200910089227 A CN200910089227 A CN 200910089227A CN 200910089227 A CN200910089227 A CN 200910089227A CN 101608125 B CN101608125 B CN 101608125B
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Abstract
The invention provides a method for upgrading coal pyrolysis, comprising the following steps: (a) sending raw coal with granularity being less than and equal to 30mm into a rotary drier, so that the raw coal and hot flue gas are connected with each other by the means of parallel flow and directly change heat, and the raw coal exchanges heat indirectly with hot semicoke from a pyrolyzer in the rotary drier, to dry the raw coal; (b) mixing the dried raw coal with the high-temperature semicoke from a heating rotary kiln and sending the mixture into the pyrolyzer, wherein the coal material directly changes heat with the high-temperature semicoke and pyrolyzes to generate hot semicoke, tar steam and coal gas, wherein final pyrolyzing temperature is 500 DEG C-700 DEG C; and (c) sending a part of the hot semicoke generated into the heating rotary kiln for processing by means of heating, and sending the rest part of the hot semicoke into the rotary drier for exchanging heat directly with the raw coal. The method for upgrading coal pyrolysis has flexible operation, wide granularity range of the coal material, good quality of the generated semicoke and the generated tar, high cascade utilization of energy and high system thermal efficiency, properly solving the technical problems such as dust and tar blocking, high dust content in the tar, etc.
Description
Technical field
The present invention relates to a kind of method for upgrading coal pyrolysis, more particularly, is a kind of low rank coal pyrolysis method for upgrading.
Background technology
Low rank coal is meant brown coal and the lower bituminous coal of metamorphic grade.Wherein, Lower-grade metamorphic bituminous long-flame coal, non-caking coal, weakly caking coal, the bottle coal etc. of comprising; Its total amount accounts for the coal in China reserves more than 50%, and coal characteristics is: volatile matter is higher, the low temperature pyrogenation tar yield is higher, chemical reactivity good, have higher comprehensive development and utilization is worth.Pyrolysis (or destructive distillation) is exactly a kind of coal processing and utilization commonly used technology.Since the seventies, the exploitation of improving quality of coal by pyrolysis technology generally receives publicity from the last century, and the investigator has developed kinds of processes in succession.
Canada UMATAC Industrial Arte Tecnica S.A. has developed ATP (instant heating semicoke Hybrid Heating oil-sand pyrolysis rotary kiln) technology and has been used for the brown coal pyrolysis.This technical equipment structure more complicated, control difficulty bigger; It only adopts indirect heat exchange with cold coal preheating; Can not guarantee the degree of drying of brown coal; And hot flue gases is unfavorable for heat recuperation with cindery discharge, and adopts direct combustion ashes carbon residue to provide the mode of heat to be used for the brown coal pyrolysis, will influence semicoke quality etc.
The multistage pyrolytic process has been developed the eighties in France Ma Linuo thermolysis center (being called for short CPM), and this technology is divided into drying, pyrolysis and cooling three parts.At first; Utilizing temperature is hot flue gases dry wet coal in a double worm mixer of 250 ℃; Send into pyrolysis in the internal-heated rotary furnace to moisture-free coal then, and heat in the stove internal combustion by the organic volatile of coal cracking generation, last; Particle Jiao after the pyrolysis gets into spray cooling in another rotary kiln by pyrolysis oven, and discharge the burnt cooling of finished product back.Its highest pyrolysis temperature can be controlled in 800 ℃-1200 ℃, and coke volatile component is 2%-5%.The weak point of this technology is that pyrolysis section is an internal-heated rotary furnace, and the valuable compounds such as tar that coal produces in pyrolytic process all can not reclaim and processing and utilization.In addition, the double worm mixer of dryer section is close defeated mutually material, is not suitable for the drying and dehydrating of high-moisture feed coal.
CN 1066459A disclose in a kind of multistage rotary kiln gaseous heat-carrier external-heat low in warm fast pyrolysis process (being called for short MRF technology).This technology is carried out coal drying, pyrolysis and semicoke refrigerating work procedure respectively in three rotary kilns, dryer section adopts the stack gas internal heat type, and pyrolysis section adopts external heating type, and inner-cooled is adopted in the semicoke cooling.This process characteristic is the raw coal size that adapts to relative broad range, and the semicoke granularity is 3mm-20mm, and its processing condition control can realize that temperature is 600 ℃ of pyrolysis more than-800 ℃ flexibly, and the external-heat pyrolysis helps reclaiming coal gas and tar.But, there are deficiencies such as heat utilization efficiency is on the low side, the coal pyrolysis dust removing effects is poor, quality of coke tar difference in this technology.
Summary of the invention
The objective of the invention is to: a kind of improved method for upgrading coal pyrolysis is provided, to overcome defectives such as the heat utilization efficiency that exists in the prior art is low, the pyrolysis dust removing effects is poor, quality of coke tar is low.
Method for upgrading coal pyrolysis provided by the present invention may further comprise the steps:
(a) feed coal of granularity≤30mm is sent in the rotary dryer, make its with hot flue gases and stream contact, direct heat exchange; Meanwhile, said feed coal in rotary dryer with from the hot semicoke indirect heat exchange of pyrolyzer, thereby realize the drying of feed coal;
(b) the dried raw material coal with send in the pyrolyzer after high temperature semicoke from the heating rotary kiln mixes, pyrolysis also takes place in said feed coal and the direct heat exchange of high temperature semicoke, generates hot semicoke, tar steam and coal gas, final pyrolysis temperature is 500 ℃-700 ℃;
(c) a hot semicoke part that is generated is delivered to the heating rotary kiln and is carried out hyperthermic treatment, and remaining hot semicoke is delivered to rotary dryer and is used for and the feed coal indirect heat exchange, discharges as product through the cooled semicoke of rotary dryer.
Preferably, method for upgrading coal pyrolysis provided by the present invention is further comprising the steps of:
(d) step (b) tar steam that is generated and the mixed gas of coal gas are sent in the combination cleaning apparatus carried out dedusting, and control dedusting temperature, make the not condensation of tar steam in the coal gas;
(e) coal gas that contains tar steam after the dedusting is sent in the gas cleaning device purified, to remove the tar in the coal gas.
Further preferably, method for upgrading coal pyrolysis provided by the present invention further may further comprise the steps:
(f) coal gas after purifying is delivered to burner and is burnt, and the high-temperature gas that is generated is as the thermal source of semicoke heating rotary kiln; In the heating rotary kiln, from the hot semicoke of pyrolyzer and said high-temperature gas counter current contact, direct heat exchange, the temperature of the high temperature semicoke that is generated is 700 ℃-900 ℃.
Further specify method provided by the present invention below, understand the present invention better to help those skilled in the art.
In method for upgrading coal pyrolysis provided by the present invention, said feed coal preferably adopts low rank coal, for example, and brown coal, long-flame coal, non-caking coal, weakly caking coal or bottle coal etc.
Rotary dryer according to the invention has tube-in-tube structure.In rotary dryer; Said feed coal contact with hot flue gases and stream, in the direct heat exchange; Also with from the hot semicoke of pyrolyzer with and the mode of stream carry out indirect heat exchange; That is the flow through inner sleeve of rotary dryer of feed coal and hot flue gases, the hot semicoke formed annular space between inner sleeve and the urceolus of flowing through.Preferably, through said step (a), the moisture that feed coal is heated in 110 ℃-150 ℃, feed coal is reduced to 2%-6%; Correspondingly, said semicoke can be cooled to 180 ℃-300 ℃; Further preferably, said low degree of coalification feed coal is heated to that moisture in 110 ℃-130 ℃, feed coal is reduced to 2%-4%, semicoke is cooled to 180 ℃-220 ℃.
In said step (b), said dried raw material coal can carry out in blender with mixing of high temperature semicoke, for example, can adopt this area mixing equipment commonly used such as screw mixer.Said dried raw material coal is 1 with the high temperature semicoke according to weight ratio: the ratio of 2-8 is mixed, and preferred blending ratio is 1: 3-7, further preferred blending ratio is 1: 4-6.
In said step (b), said pyrolyzer can be selected any this area pyrolysis installation commonly used for use, preferred moving bed pyrolysis device.Said final pyrolysis temperature is preferably 550 ℃-650 ℃, further is preferably 590 ℃-610 ℃.
In said step (c), preferably, about 60 weight %-90 weight % of the hot semicoke that step (b) is generated deliver to the heating rotary kiln and carry out hyperthermic treatment, and remaining hot semicoke is delivered to rotary dryer and is used for and the feed coal indirect heat exchange; Further preferably, about 65 weight %-85 weight % of the hot semicoke that step (b) is generated deliver to the heating rotary kiln and carry out hyperthermic treatment, and remaining hot semicoke is delivered to rotary dryer and is used for and the feed coal indirect heat exchange.
In said step (d), the mixed gas that comprises tar steam and coal gas that is generated in the step (b) is sent into the subsequent combination cleaning apparatus carry out dedusting.Wherein, said combination cleaning apparatus mainly is made up of tornado dust collector and filter collector; Said tornado dust collector can be single-stages, also can be two-stage series connections; Said filter collector comprises a housing, is provided with hot semicoke bed in the said housing, and said housing both sides are respectively equipped with gas entry and gas exit, has hot semicoke inlet and the outlet of hot semicoke on the said housing; The outlet of said tornado dust collector is connected with said filter collector inlet, and in dust removal process, this combination cleaning apparatus is controlled in the uncondensable hot environment of the tar that makes in the coal gas.Said combination cleaning apparatus sees also one Chinese patent application 200910076432.x in the specific requirement of setting and operating aspect.
In said step (e), the coal gas that contains tar steam after the dedusting is sent in the gas cleaning device and is purified, to remove the tar in the coal gas.Preferably, said gas cleaning device is mainly formed by spraying bend pipe and horizontal water-tube cooler.The said coal gas that contains tar steam is earlier via spraying the flushing liquor spray cold shock that sprays in the bend pipe, and the saturated coal gas of gained cools off through horizontal water-tube cooler again after the cold shock.Can adopt any this area cold shock medium commonly used by the flushing liquor that sprays the bend pipe ejection, for example, cyclic ammonia water or water coolant; Said horizontal water-tube cooler can adopt water coolant as heat-eliminating medium, and water coolant gets into the tube side of horizontal water-tube cooler, and coal gas gets into its shell side.Resulting tar reclaims with the mode of oily water separation.
In said step (f), the coal gas after step (e) removes tar is sent into burner and is burnt, and preferably carries out incomplete combustion, and the high-temperature gas that is generated (comprising the coal gas that the high-temperature flue gas Buddhist monk is imperfect combustion) is delivered to semicoke heating rotary kiln as thermal source.In step (f), there is not particular requirement for the structure of described burner, can select any this area combustion unit commonly used for use.In the heating rotary kiln, from the hot semicoke of pyrolyzer and said high-temperature gas counter current contact, direct heat exchange, the temperature of the high temperature semicoke that is generated is preferably 750 ℃-850 ℃, further is preferably 790 ℃-810 ℃.
In the heating rotary kiln with hot semicoke counter current contact after formed high-temperature flue gas be delivered in the chuck of pyrolyzer, as the thermal source of pyrolyzer jacket hot tracing, to keep the temperature in the pyrolyzer.The stack gas of pyrolyzer chuck of flowing through can be delivered to rotary dryer, as the drying medium and the thermal source of rotary dryer.
What need further specify is that it is 1 in molar ratio that hot flue gases described in the step (a) preferably adopts the stack gas of the pyrolyzer chuck of flowing through and the cycle flue gas or the empty branch nitrogen of rotary dryer: the hot flue gases that the 1-3 mixing preparation forms.Said cycle flue gas is meant flow through rotary dryer and the stack gas after fly-ash separator (for example sack cleaner) dedusting.The said empty nitrogen that divides is meant the nitrogen from air separation facility.In the present invention, the mixing mol ratio of above-mentioned several portion gas is not limited to aforementioned proportion, can adjust flexibly as the case may be, as long as can guarantee temperature＞400 ℃ of mixed hot flue gases, preferred temperature of mixing the back hot flue gases is 440-480 ℃.
Compared with prior art, the beneficial effect of method for upgrading coal pyrolysis provided by the present invention is mainly reflected in following aspect:
(1) in the method for the invention; The drying of feed coal, pyrolysis and semicoke heating are carried out in the different operation module respectively; Can avoid moisture in coal, heated air to get in the coal gas; Therefore, can reduce oily water separation load, sewage load and coal gas treatment capacity, and conveniently regulate respectively and control;
Equipment such as rotary dryer that (2) the present invention adopted and heating rotary kiln; Be suitable for handling powdery, granular material; Thereby make the size range broad of the coal charge that the present invention can handle; The feed coal of granularity≤30mm all can adopt the method for the invention to handle, and resulting semicoke can be used for different industrial circles such as large-scale gasifying process, calcium carbide production, iron alloy production;
(3) in the present invention, because material translational speed in pyrolyzer is slow, the speed of the mixed gas outflow pyrolyzer that pyrolysis discharges is also slow, so can effectively remove most of dust of carrying secretly in the dry distillation gas, avoids simultaneously producing dust because of stirring;
(4) the present invention as solid thermal carriers, simplified operation, reduces running cost with self-produced semicoke;
(5) the present invention utilizes hot combination cleaning apparatus that the coal gas that contains tar steam that is generated in the pyrolytic process is carried out dedusting; Can effectively prevent tar condensing; And has higher efficiency of dust collection, technical barrier such as solved in the pyrolytic process that ubiquitous tar dust stops up and the tar dustiness is big;
(6) the present invention can adopt pyrolysis coal gas as the semicoke thermal source, need not coal-char combustion, and the quality of semicoke is improved;
(7) the present invention utilizes after the heat exchange high-temperature flue gas as the drying medium of pyrolysis companion's thermal medium and coal; And utilize semicoke and feed coal in the heat exchange of rotary dryer indirect; At the waste heat recovery that realizes semicoke and high-temperature flue gas, refrigerative simultaneously; Also make the energy in the system obtain rational cascade utilization, thereby the thermo-efficiency of this technological process is significantly improved.
In sum; Characteristics such as method for upgrading coal pyrolysis provided by the present invention has that flexible operation, coal charge size range are wide, the quality of the semicoke produced and tar is good; Technical barrier such as properly settled especially that the tar dust stops up and the tar dustiness is big; Realize cascaded utilization of energy, the thermo-efficiency of system is significantly improved than same device.
Description of drawings
Fig. 1 is the schematic flow sheet of method for upgrading coal pyrolysis provided by the present invention.
Embodiment
To combine accompanying drawing further explain method for upgrading coal pyrolysis provided by the present invention below, but therefore the present invention does not receive any restriction.
As shown in Figure 1, the feed coal of granularity≤30mm is sent in the rotary dryer 1 through pipeline 8, and making itself and temperature from pipeline 9 is that hot flue gases and stream about 440-480 ℃ contacts, direct heat exchange.Meanwhile, said feed coal in rotary dryer with from pyrolyzer 2 and through pipeline 17 with 18 the input hot semicoke indirect heat exchange, thereby the realization feed coal drying.Discharge from pipeline 10 as product through the cooled semicoke of rotary dryer.
Dried coal charge is through pipeline 16 output, and this strand coal charge is sent in the pyrolyzer 2 through pipeline 28 with after the high temperature semicoke through pipeline 25 is exported from heating rotary kiln 5 mixes.In pyrolyzer, pyrolysis also takes place in said coal charge and the direct heat exchange of high temperature semicoke, generates hot semicoke, tar steam and coal gas, and final pyrolysis temperature is 500 ℃-700 ℃.
The hot semicoke that is generated in the pyrolyzer is through pipeline 17 output, and wherein, a part of hot semicoke is delivered to heating rotary kiln 5 through pipeline 19 and carried out hyperthermic treatment, and remaining hot semicoke is delivered to rotary dryer 1 through pipeline 18 and is used for and the feed coal indirect heat exchange.
In the preferred embodiment of the present invention, in the pyrolyzer the mixed gas of the tar steam that generates and coal gas be delivered to combination cleaning apparatus 3 through pipeline 20 and carry out dedusting.Because comprise that an inside is provided with the filter collector of hot semicoke bed in the said combination cleaning apparatus, described dust removal step can be accomplished in hot environment, therefore, the tar steam in dust removal process in the coal gas can not be condensed.
Tar steam after the dedusting and coal gas are delivered to through pipeline 21 and carry out purifying treatment in the gas cleaning device 4, to remove the tar in the coal gas.Purifying treatment described here mainly is through the mode that cools, and it is liquid making tar condensing, so that from coal gas, separate.The tar of separating and the mixture of water are discharged through pipeline 22.Cooling and the coal gas that removes behind the tar can be delivered to burner 7 use that acts as a fuel through pipeline 23; The high-temperature gas that generated of burning is delivered to the heating rotary kiln 5 of semicoke through pipeline 24, and with hot semicoke counter current contact, the direct heat exchange from pyrolyzer 2, the temperature of the high temperature semicoke that is generated is 700 ℃-900 ℃.What need explanation is, burner 7 also can adopt other low-heat value gas or fuel as thermal source, and the coal gas that will cool off and remove behind the tar supplies outward as domestic gas.The coal gas of method for upgrading coal pyrolysis production provided by the present invention has middle calorific value.
In heating rotary kiln 5 with the semicoke counter current contact after formed high-temperature flue gas in pipeline 26 is delivered to the chuck of pyrolyzer 2, as the thermal source of pyrolyzer jacket hot tracing, to keep the temperature in the pyrolyzer.The stack gas of pyrolyzer chuck of flowing through can be delivered to rotary dryer, as the drying medium and the thermal source of rotary dryer.
In the preferred embodiment of the present invention, the stack gas of the rotary dryer 1 of flowing through is delivered to sack cleaner 6 dedustings through pipeline 11, and the stack gas after the part dedusting is returned rotary dryer 1 through pipeline 13 and 15 and reused as cycle flue gas; And the emptying after cooling off of remaining stack gas.
Described in the step of the present invention (a) through pipeline 9 deliver to hot flue gases in the rotary dryer preferably adopt the pyrolyzer chuck of flowing through stack gas and rotary dryer cycle flue gas or empty to divide nitrogen be 1 in molar ratio: the hot flue gases that the 1-3 mixing preparation forms.
Pass through embodiment further explain method provided by the present invention below, but therefore the present invention does not receive any restriction.
The rotary dryer that is adopted among the embodiment is on the basis of the rotary dryer of routine, to transform to form.For being fit to the requirement of the method for the invention, set up the inner sleeve that is used for the semicoke indirect heat exchange in the inside of rotary dryer.
The moving bed pyrolysis device that is adopted among the embodiment is the moving-bed of wedged bottom structure; The traverse baffle of inclination is set above its opening for feed; To stop macrobead coal dust or burnt dirt, be provided with the two stage cyclone dedusting between the outlet of traverse baffle top to pyrolysis gas, exit gas is connected with the particle filtration fly-ash separator again.Pyrolyzer solid useful volume confirms by contact heat transfer time (being the residence time) of semicoke and coal and treatment capacity, present embodiment press solid retention time 30 minutes, to handle coal amount 1.5t/h definite.For being fit to the requirement of the method for the invention, set up high-temperature flue gas companion thermal jacket in the inside of moving bed pyrolysis device.
The Bao Rixile brown coal of granularity≤30mm (the coal analysis data are seen table 1); Send in the rotary dryer continuously with 1.5t/h; Be the hot flue gases about 460 ℃ and flow and pass through rotary dryer with temperature; Brown coal and hot flue gases direct heat exchange in this process, and remove contained humidity in the brown coal as far as possible.In rotary dryer, said brown coal raw material carries out indirect heat exchange with hot semicoke from pyrolyzer simultaneously, feed coal and the hot flue gases inner sleeve of flowing through, the hot semicoke formed annular space between inner sleeve and the urceolus of rotary dryer of flowing through.Brown coal are heated to about 130 ℃ the most at last, and moisture is reduced to approximately 4% in the brown coal, and hot semicoke is cooled to about 180 ℃.
Dried about 130 ℃ brown coal are sent into after screw mixer mixes in the moving bed pyrolysis device with 1: 5.6 weight ratio with about 800 ℃ hot semicoke from the heating rotary kiln; Pyrolysis also takes place in brown coal raw material and the direct heat exchange of high temperature semicoke; Generate hot semicoke, tar steam and coal gas, final pyrolysis temperature is about 610 ℃.
About 80 weight % in about 610 ℃ the hot semicoke that is generated in the moving bed pyrolysis device send into the heating rotary kiln through tripper and carry out heat temperature raising, and remaining hot semicoke is delivered to rotary dryer as thermal source, with brown coal raw material indirect heat exchange.With behind the brown coal raw material indirect heat exchange and the semicoke that has been cooled through further exporting as the semicoke product after the water spray cooling.
Send into coal gas and the formed high-temperature gas mixture body of flue gas counter current contact after hot semicoke and the not clean-burning purification as yet in the heating rotary kiln, the temperature of semicoke further is promoted to about 800 ℃.High temperature semicoke behind heating rotary kiln heat temperature raising is delivered to the moving bed pyrolysis device, with the direct heat exchange of dried raw material coal and carry out pyrolytic reaction.And the high-temperature flue gas that is generated in the heating rotary kiln is delivered to the moving bed pyrolysis device, as the thermal source of its jacket hot tracing.The stack gas of moving bed pyrolysis device chuck of flowing through is delivered to rotary dryer, as the drying medium and the thermal source of rotary dryer.
But process method LP according to the invention quiet run, the productive rate and the main character of resulting pyrolysis product are seen table 2.
Table 1: the analytical data of feed coal
The feed coal that present embodiment adopted, testing apparatus are identical with embodiment 1, and main operational steps is also basic identical with embodiment 1, and the key distinction is following:
Brown coal are admitted in the rotary dryer with 1.5t/h continuously, and with hot flue gases heat exchange, the dehydration of 440 ℃ of temperature, brown coal are heated to 110 ℃, its moisture and reduce to about 6%, semicoke product and be cooled to about 220 ℃ the most at last.
Dried brown coal are sent into after screw mixer mixes in the moving bed pyrolysis device with 1: 6 weight ratio with about 750 ℃ hot semicoke from the heating rotary kiln; Pyrolysis also takes place in brown coal raw material and the direct heat exchange of high temperature semicoke; Generate hot semicoke and the coal gas that contains tar steam, final pyrolysis temperature is about 650 ℃.
The coal gas that contains tar steam that is generated in the moving bed pyrolysis device is sent into the combination cleaning apparatus carry out dedusting.The combination cleaning apparatus is made up of the tornado dust collector and the filter collector of two-stage series connection.The outlet of said tornado dust collector is connected with the filter collector inlet, and in dust removal process, this combination cleaning apparatus is controlled in the uncondensable hot environment of the tar that makes in the coal gas.The combination cleaning apparatus that is adopted in the present embodiment sees also the relevant explanation among the one Chinese patent application 200910076432.x specification sheets part embodiment 2.Hot semicoke in the filter collector comes from the heating rotary kiln and through screening, the semicoke after the dedusting mixes together as product with the semicoke that advances rotary dryer through the material envelope.
Tar steam after the dedusting and coal gas are delivered to through pipeline 21 and carry out purifying treatment in the gas cleaning device 4, to remove the tar in the coal gas.The tar of separating and the mixture of water are discharged through pipeline 22, deliver to subsequent handling and handle.Cooling and remove coal gas behind the tar and be delivered to burner 7 through pipeline 23 and carry out incomplete fuel.The heating rotary kiln 5 that the high-temperature gas that generated of burning is delivered to semicoke through pipeline 24 is as thermal source.
Through test, the productive rate and the main character of resulting pyrolysis product are seen table 2.
Table 2
Annotate: the specification of the heating rotary kiln that is adopted among the embodiment is Φ 1450 * 14000.
Claims (20)
1. method for upgrading coal pyrolysis may further comprise the steps:
(a) feed coal of granularity≤30mm is sent in the rotary dryer, make its with hot flue gases and stream contact, direct heat exchange; Meanwhile, said feed coal in rotary dryer with from the hot semicoke indirect heat exchange of pyrolyzer, thereby realize the drying of feed coal;
(b) the dried raw material coal with send in the pyrolyzer after high temperature semicoke from the heating rotary kiln mixes, pyrolysis also takes place in said feed coal and the direct heat exchange of high temperature semicoke, generates hot semicoke, tar steam and coal gas, final pyrolysis temperature is 500 ℃-700 ℃;
(c) the hot semicoke part that pyrolysis generated is delivered to the heating rotary kiln and is carried out hyperthermic treatment, and remaining hot semicoke is delivered to rotary dryer and is used for and the feed coal indirect heat exchange, discharges as product through the cooled semicoke of rotary dryer.
2. method for upgrading coal pyrolysis according to claim 1 is characterized in that: this method further may further comprise the steps:
(d) step (b) tar steam that is generated and the mixed gas of coal gas are sent in the combination cleaning apparatus carried out dedusting, and control dedusting temperature, make the not condensation of tar steam in the coal gas;
(e) mixed gas of tar steam after the dedusting and coal gas is sent in the gas cleaning device purified, to reclaim tar.
3. method for upgrading coal pyrolysis according to claim 2 is characterized in that: this method further may further comprise the steps:
(f) coal gas after purifying is delivered to burner and is burnt, and the high-temperature gas that is generated is as the thermal source of semicoke heating rotary kiln; In the heating rotary kiln, from the hot semicoke of pyrolyzer and said high-temperature gas counter current contact, direct heat exchange, the temperature of the high temperature semicoke that is generated is 700 ℃-900 ℃.
4. method for upgrading coal pyrolysis according to claim 3 is characterized in that: through said step (a), feed coal is heated to 110 ℃-150 ℃, and the moisture in the feed coal is reduced to 2%-6%, and said semicoke is cooled to 180 ℃-300 ℃.
5. method for upgrading coal pyrolysis according to claim 4 is characterized in that: said feed coal is heated to 110 ℃-130 ℃, and the moisture in the feed coal is reduced to 2%-4%, and semicoke is cooled to 180 ℃-220 ℃.
6. according to claim 4 or 5 described method for upgrading coal pyrolysis, it is characterized in that: in said step (b), said dried raw material coal is 1 with the high temperature semicoke according to weight ratio: the ratio of 2-8 is mixed.
7. method for upgrading coal pyrolysis according to claim 6 is characterized in that: said dried raw material coal and high temperature semicoke are by weight 1: the ratio of 3-7 is mixed.
8. method for upgrading coal pyrolysis according to claim 7 is characterized in that: said dried raw material coal and high temperature semicoke are by weight 1: the ratio of 4-6 is mixed.
9. method for upgrading coal pyrolysis according to claim 6 is characterized in that: said final pyrolysis temperature is 550 ℃-650 ℃.
10. method for upgrading coal pyrolysis according to claim 9 is characterized in that: said final pyrolysis temperature is 590 ℃-610 ℃.
11. according to claim 9 or 10 described method for upgrading coal pyrolysis; It is characterized in that: in said step (c); 60 weight %-90 weight % of the hot semicoke that step (b) is generated deliver to the heating rotary kiln and carry out hyperthermic treatment, and remaining hot semicoke is delivered to rotary dryer and is used for and the feed coal indirect heat exchange.
12. method for upgrading coal pyrolysis according to claim 11; It is characterized in that: 65 weight %-85 weight % of the hot semicoke that step (b) is generated deliver to the heating rotary kiln and carry out hyperthermic treatment, and remaining hot semicoke is delivered to rotary dryer and is used for and the feed coal indirect heat exchange.
13. method for upgrading coal pyrolysis according to claim 11 is characterized in that: said combination cleaning apparatus mainly is made up of tornado dust collector and filter collector; Wherein, said tornado dust collector are single-stage or two-stage series connection, and said filter collector comprises a housing, are provided with hot semicoke bed in the said housing, and said housing is provided with gas entry and gas exit and hot semicoke inlet and the outlet of hot semicoke; The outlet of said tornado dust collector is connected with said filter collector inlet, and in dust removal process, said combination cleaning apparatus is controlled at and makes in the uncondensable hot environment of tar steam.
14. method for upgrading coal pyrolysis according to claim 13 is characterized in that: said gas cleaning device is mainly formed by spraying bend pipe and horizontal water-tube cooler; The said mixed gas that contains coal gas and tar steam is earlier via spraying the flushing liquor spray cold shock that sprays in the bend pipe, and the saturated coal gas of gained cools off through horizontal water-tube cooler again after the cold shock.
15. method for upgrading coal pyrolysis according to claim 14; It is characterized in that: in said step (f); Coal gas after step (e) removes tar is sent into burner and is carried out incomplete combustion, and the high-temperature gas that is generated is delivered to semicoke heating rotary kiln as thermal source; The temperature of the high temperature semicoke that is generated is 750 ℃-850 ℃.
16. method for upgrading coal pyrolysis according to claim 15 is characterized in that: the temperature of the high temperature semicoke that is generated is 790 ℃-810 ℃.
17. method for upgrading coal pyrolysis according to claim 15 is characterized in that: in the heating rotary kiln with hot semicoke counter current contact after formed high-temperature flue gas be delivered in the chuck of pyrolyzer, as the thermal source of pyrolyzer jacket hot tracing; The stack gas of pyrolyzer chuck of flowing through is delivered to rotary dryer, as the drying medium and the thermal source of rotary dryer.
18. method for upgrading coal pyrolysis according to claim 17; It is characterized in that: it is 1 in molar ratio that hot flue gases described in the step (a) adopts the stack gas of the pyrolyzer chuck of flowing through and the cycle flue gas or the empty branch nitrogen of rotary dryer: the 1-3 mixing preparation forms; And the temperature of mixed hot flue gases＞400 ℃, said cycle flue gas is meant flow through rotary dryer and the stack gas after the fly-ash separator dedusting.
19. method for upgrading coal pyrolysis according to claim 18 is characterized in that: the temperature of said mixed hot flue gases is 440-480 ℃.
20. method for upgrading coal pyrolysis according to claim 17 is characterized in that: said rotary dryer has tube-in-tube structure; Said pyrolyzer is the moving bed pyrolysis device.
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| CN101805625B (en) * | 2010-04-22 | 2013-01-30 | 西安三瑞实业有限公司 | Method for preparing carbocoal by thermally cracking raw coal with external-heat horizontal rotary charring furnace |
| CN101880540B (en) * | 2010-07-02 | 2013-06-19 | 西北化工研究院 | Low-coalification degree pulverized coal pyrolysis method and product prepared through the same |
| JP5804972B2 (en) * | 2012-02-24 | 2015-11-04 | 三菱重工業株式会社 | Modified coal production facility and control method thereof |
| CN103509570B (en) * | 2012-06-28 | 2015-03-18 | 北京低碳清洁能源研究所 | Coal pyrolysis system and pyrolysis process thereof |
| CN102878566B (en) * | 2012-10-12 | 2015-01-07 | 大连理工大学 | Organic solid fuel drying, pyrolyzing and incinerating integrated method and organic solid fuel drying, pyrolyzing and incinerating integrated device |
| CN104419492A (en) * | 2013-09-04 | 2015-03-18 | 佐藤邦道 | Calorific value increasing method of low-calorific value coal |
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| CN105199763A (en) * | 2015-10-22 | 2015-12-30 | 航天长征化学工程股份有限公司 | Circulating gas heat carrier coal pyrolysis system and pyrolysis method thereof |
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| CN105385467A (en) * | 2015-11-27 | 2016-03-09 | 华电重工股份有限公司 | Low-rank coal carbonization process and system |
| CN106590709B (en) * | 2016-10-27 | 2019-06-18 | 武汉钢铁有限公司 | The dry coke quenching technique for being prepared and being recycled based on water-gas |
| CN106566568B (en) * | 2016-10-27 | 2019-04-09 | 武汉科技大学 | A kind of dry quenching system residual heat and energy method of comprehensive utilization |
| CN108315030A (en) * | 2018-05-03 | 2018-07-24 | 席轶 | A kind of biomass carbonated and lignite upgrading method |
| CN109161391B (en) * | 2018-09-06 | 2020-10-16 | 西安三瑞实业有限公司 | Method and equipment for treating raw coke oven gas by utilizing coal pyrolysis waste heat |
| CN109401768A (en) * | 2018-11-02 | 2019-03-01 | 湖北亚首生物质新能源科技有限公司 | Implement the system and this method of method of biomass pyrolysis |
| CN111253980A (en) * | 2018-11-30 | 2020-06-09 | 浙江天禄环境科技有限公司 | Preparation method and system of synthesis gas |
| CN111363598B (en) * | 2018-12-26 | 2021-03-23 | 国家能源投资集团有限责任公司 | Method for producing clean coal |
| CN115261052B (en) * | 2022-07-05 | 2023-04-07 | 西安科技大学 | Oil-rich coal and magnetic catalyst co-catalytic pyrolysis process |
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