CN104371779A - Method and system for preparing high-concentration water-coal-slurry employing low-rank coal - Google Patents
Method and system for preparing high-concentration water-coal-slurry employing low-rank coal Download PDFInfo
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Abstract
The invention discloses a method and a system for preparing high-concentration water-coal-slurry employing low-rank coal, and aims at solving the problems of low slurry concentration, high energy consumption and high operation cost in existing water-coal-slurry preparation employing low-rank coal. The method comprises the following steps: carrying out deep drying on low-rank coal; carrying out pyrolysis; cooling semicoke; grinding coal; forming slurry; and the like. The system comprises a drying furnace, a reacting furnace, a coke cooling furnace, a coal mill and a stirring device, which are serially connected with one another in series, wherein the drying furnace, the reacting furnace and the coke cooling furnace are the same in furnace body structure, and respectively comprise an upper furnace body and a rotatable lower furnace hearth; a feeding hole and an air outlet are formed in each upper furnace body; each lower furnace hearth is provided with a slope surface which descends in a stepped manner from the periphery part to a center feed opening; and a coal distributor is arranged above the slope surface of each lower furnace hearth. The method is simple in process, low in production cost and operation cost, energy-saving and environmentally friendly; and a pyrolysis gas with high calorific value, high-quality tar and high-concentration water-coal-slurry can be obtained.
Description
Technical field
The present invention relates to a kind of method for producing water coal slurry and system thereof, a kind of low-rank coal prepares method and the system thereof of high-concentration coal-water slurry specifically.
Background technology
Along with the high coal that goes bad is used fewer and fewer, the high-efficiency cleaning of low-rank coal utilizes and shows important day.Present stage low-rank coal Efficient Conversion Land use systems for prepare semicoke and coal gas by pyrolysis.Low-rank coal reactive behavior is high, high as gasified raw material gasification efficiency.
But during by low-rank coal preparation coal water slurry, coal rank are lower, inherent moisture is higher, carbon ratio is higher, and the sludge forming performance of coal is poorer, are difficult to make high-concentration coal-water slurry.For coal water slurry gasification, water coal slurry concentration and quality higher, synthesis system production capacity increases, and than oxygen consumption and lower than coal consumption, after water coal slurry concentration improves, the economic benefit brought is very considerable.
For a long time, low-rank coal prepares achieving no breakthrough property of high-concentration coal-water slurry technology progress.Exploitation low-rank coal prepares high-concentration coal-water slurry technology, can widen the utilization ways of coal resources in China.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, providing that a kind of technique is simple, production cost and running cost is low, energy-conserving and environment-protective, the low-rank coal of the pyrolysis gas and high-concentration coal-water slurry that can obtain high heating value prepares the method for high-concentration coal-water slurry.
The present invention also provides that a kind of system for aforesaid method is simple, the high-concentration coal-water slurry preparation system of energy-conserving and environment-protective.
The inventive method comprises the following steps:
1) depth drying: send into drying oven after low-rank coal is crushed to granularity≤50mm and carry out depth drying by the method for carrying out indirect heat exchange with thermal barrier, obtain dried tail gas and moisture-free coal;
2) pyrolysis: moisture-free coal is sent into Reaktionsofen and carry out pyrolysis by the method for carrying out indirect heat exchange with thermal barrier, obtain pyrolysis gas and hot semicoke;
3) semicoke cooling: hot semicoke to be sent in cold coke oven by below the method fast cooling to 80 DEG C of atomization quenching, obtain gas and cold semicoke;
4) send into after cold semicoke and additive being added pulping water coal pulverizer levigate after carry out grating, be specially: the semicoke of 1mm ~ 0.071mm size range: be less than the semicoke of 0.071mm size range by (4-6): the mass ratio of (6-4) carries out grating;
5) pulping: the compound stirring and evenly mixing after grating is made coal water slurry.
Described step 1) in, the temperature of depth drying controls, at 150 DEG C-200 DEG C, to control time of drying at 30-50min; Described step 2) in, pyrolysis reaction temperature controls at 400 DEG C-650 DEG C, and pyrolysis time controls at 20-40min.
Described step 3) in, the mist droplet particle size of described atomization quenching is 5-10 μm, and water loss is no more than 30% of hot semicoke quality, and the coke breeze in hot semicoke and grain Jiao increase the contact area of same droplet, improve cooling performance.
Described step 1) in the dried tail gas that obtains send into exhaust gas recovery system process and obtain water of condensation and waste gas, described condensate portion is recycled to for being atomized quenching in cold coke oven, and remainder water of condensation is as step 4) in pulping water send coal pulverizer opening for feed.
The pyrolysis gas obtained in described step (2) is sent in coke tar recovery system and is obtained moisture tar and raw gas together with the gas obtained in step (3), described raw gas is sent into after electric fishing system reclaims tar further and is obtained coal gas, described coal gas part is sent into after gas-fired system generates high-temperature flue gas and is first sent into Reaktionsofen and moisture-free coal indirect heat exchange to 400 DEG C-600 DEG C as thermal barrier, and then discharges as waste gas after sending into drying oven and low-rank coal indirect heat exchange; Described moisture tar is isolated through oil-water separation system and to be remained waste water after tar send coal pulverizer opening for feed as pulping water in step (4) after Waste Water Treatment process.
When drying oven or Reaktionsofen inner drying or pyrolysis temperature too high time, the thermal barrier part after the heat exchange that described drying oven is discharged is recycled in drying oven or Reaktionsofen chuck and mixes to regulate drying or pyrolysis temperature with thermal barrier, and rest part is discharged as waste gas.
In described step (5), after compound feeding swirler levigate in the future carries out grating, stirring and evenly mixing makes coal water slurry again, is specially: the semicoke of 1mm ~ 0.071mm size range: be less than the semicoke of 0.071mm size range by (4-6): the mass ratio of (6-4) carries out grating;
In the present invention, thermal barrier indirect heat exchange is adopted in depth drying and pyrolysis step, thermal barrier (as the high-temperature flue gas) direct contact heat transfer of comparatively passing by is compared, in the pyrolysis gas (raw gas) generated after thermal barrier can not be made to be mixed into pyrolytic reaction, ensure finally to obtain high heating value gas product (volume percent: methane content 20%-35%, hydrogen content 10%-30%, carbon monoxide content 5%-10%), can export as high-quality gas product.
On the one hand, part coal gas being carried out burning generation high-temperature flue gas can as thermal barrier, heat up owing to adopting indirect heat exchange in the application, therefore high-temperature flue gas first can pass in the chuck of Reaktionsofen and carry out heat exchange intensification to Reaktionsofen, the high-temperature flue-gas going out Reaktionsofen can reach 400 DEG C-600 DEG C, meet the temperature requirement of the thermal barrier of depth drying completely, therefore the high-temperature flue gas can using Reaktionsofen is sent in the chuck of drying oven again for carrying out depth drying to low-rank coal, the heat energy that high-temperature flue gas is produced fully reclaims, reduce energy consumption, improve the quantum of output of high-quality coal gas, only this at least reduces energy expenditure 20%.Further, can be reduced by temperature after flue gas (i.e. thermal barrier) heat exchange going out drying oven, when drying oven and/or reaction in-furnace temperature too high time, this part flue gas can be recycled to regulate the temperature of flue gas in chuck in chuck by direct part, thus reaches the object controlling Reaktionsofen or kiln temperatures.
On the other hand, because drying oven carries out depth drying to low-rank coal, therefore the dried tail gas water-content generated is high, phlegma can be produced when sending into exhaust gas recovery system process, this part phlegma dust-laden, cleanliness factor is low, no matter be all need further process as process water reuse or outer row, contriver is for this problem, cleverly partial condensation liquid is introduced in the spraying gun of cold coke oven, make it for being atomized quenching, owing to spraying on semicoke for cooling, therefore less demanding to atomization quenching water, native system reuse water sprays into the slurrying that semicoke can not affect the later stage, well eliminate the operation that phlegma processes further, residue water of condensation is used as pulping water, moreover, after moisture tar separation goes out tar, residue waste water also can be used as slurrying water after Waste Water Treatment slightly processes, whole system non-wastewater discharge, meet the requirement of energy-conserving and environment-protective.
Further, contriver does not adopt water quenching, but atomization quenching, utilize tiny droplet high-velocity jet to semicoke surface, during fragmentation original in the present invention, raw coal particle is just little, and after pyrolysis, in semicoke, the amount of coke breeze and grain Jiao increases further, increases with droplet contact area, comparatively water quenching, its cooling rate is faster, and water loss is little, the water content of semicoke low (water content is no more than 4%) after quenching, more be conducive to the preparation of coal water slurry, be conducive to the concentration improving coal water slurry.
High-concentration coal-water slurry preparation system of the present invention, comprise drying oven, Reaktionsofen, cold coke oven, coal pulverizer and the whipping appts of connecting successively, wherein, described drying oven, Reaktionsofen are identical with the furnace binding of cold coke oven, the lower furnace bottom comprising upper furnace body and can rotate, described upper furnace body is provided with opening for feed and air outlet, and described lower furnace bottom has by perimembranous to descending domatic of center feed opening staged, and the domatic top of described lower furnace bottom is provided with coal distributing device; And be provided with the chuck of heat carrier circulation outside the upper furnace body of described drying oven and Reaktionsofen and lower furnace bottom, in described cold coke oven, be provided with spraying gun.
The air outlet of described drying oven is connected with exhaust gas recovery system, and described exhaust gas recovery system leakage fluid dram is connected with the spraying gun of cold coke oven and the opening for feed of coal pulverizer respectively.
Described Reaktionsofen is connected with gas-fired system through coke tar recovery system, electric fishing system with the air outlet of cold coke oven, and the exhanst gas outlet of described gas-fired system is connected with the chuck of Reaktionsofen, the chuck of drying oven successively.
The descending domatic gradient of described staged is 10-15 degree, and the length of every ladder is 5 to 10 times of height.
Described coal pulverizer is connected with whipping appts through swirler.
Owing to straight contact heat-exchanging being become indirect heat exchange in drying oven and Reaktionsofen, onesize body of heater heat exchange efficiency can decline to some extent, in order to solve this technical problem, inventors performed many places to improve, 1) low-rank coal is crushed to granularity≤50mm, the coal grain heat interchanging area that granularity is less is larger, more easily realizes being rapidly heated; 2) on the basis at the bottom of rotary furnace, furnace bottom is designed to by perimembranous to descending domatic of center feed opening staged, form the domatic rolling being beneficial to the coal grain of small grain size on the one hand, rolling is easy to coal grain and fully contacts with High Temperature Furnaces Heating Apparatus diapire face, even intensification drying or pyrolysis, improve dry or pyrolysis efficiency; Make on the other hand coal grain easily by perimembranous in center set, under the effect of coal distributing device and lower furnace bottom revolving force, finally by center feed opening blanking; 3) staged is designed to by domatic, the heat interchanging area of furnace bottom wall and the turbulence of thermal barrier can be increased to improve heat transfer efficiency, and form slight " waterfall " during the ladder landing of the coal grain of tiny good fluidity (or semicoke particle) by one-level level just as river, heat can better be absorbed, substantially increase heat exchange rate, coal grain (semicoke particle) one-level level is according to shock during gravity fall, be conducive to reducing granule strength, be easy to cracking, be beneficial to and heat up faster and follow-up levigate operation.The heat exchange efficiency of the body of heater under same volume is made at least to improve 25% by above-mentioned improvement, its heat transfer effect is suitable with direct heat exchange effect, but the quality of the pyrolysis gas obtained significantly raises, and, owing to achieving indirect heat exchange, flue gas after pyrolysis can also continue on for depth drying, and decrease the consumption of high-temperature medium, energy-saving effect is remarkable.
Beneficial effect:
Present invention process is simple, control easy, can use by oneself by efficient recovery heat energy, pyrolysis gas (the volume percent: methane content 20%-35% of by-product high heating value, hydrogen content 10%-30%, carbon monoxide content 5%-10%) and the coal tar of high-quality, there is no discharge of wastewater simultaneously, quenching effective (semicoke water content is no more than 4%wt), it is energy-saving and cost-reducing that (water-saving amount is more than 25%, at least reduce energy expenditure 20%), environmentally friendly, the water coal slurry concentration of preparation is high; Present system structure is simple, and operability is high, production cost and equipment investment cost low, heat transfer efficiency is high.
Accompanying drawing explanation
Fig. 1 is present invention process schema and system diagram;
Fig. 2 is the furnace binding figure of drying oven and Reaktionsofen;
Fig. 3 is the furnace binding figure of cold coke oven.
Fig. 4 is the descending domatic partial enlarged drawing of staged.
Wherein, 1-coal bunker; 2-low-rank coal metering outfit; 3-drying oven; 4-Reaktionsofen; The cold coke oven of 5-; 6-exhaust gas recovery system; 7-coke tar recovery system; 8-electric fishing system; 9-gas-fired system; 10-upper furnace body; Furnace bottom under 11-; 12-opening for feed; 13-air outlet; 14-center feed opening; 15-is domatic; 16-coal distributing device; 17-chuck; 18-seals filling member; The import of 19-thermal barrier; 20-heating medium outlet; 21-spraying gun; 22-half coke bin; 23-semicoke metering outfit; 24-coal pulverizer; 25-swirler; 26-whipping appts; 27-oil-water separation system; 28-Waste Water Treatment; 29-pulping water metering outfit; 30-pulping water metering outfit; 31-additive metering outfit; 32-force (forcing) pump.
Embodiment
Below in conjunction with accompanying drawing, explanation is further explained to the present invention:
With reference to Fig. 1, coal bunker 1, low-rank coal metering outfit 2, drying oven 3, Reaktionsofen 4, cold coke oven 5, coal pulverizer 24, swirler 25 are connected successively with whipping appts 26, wherein, see Fig. 2, described drying oven 3 is identical with Reaktionsofen 4 structure, by sealing filling member 18 (as water seal part or silicon carbide filler), the lower furnace bottom 11 comprising upper furnace body 10 and can rotate, ensures that the sealed state in stove does not affect the rotation of lower furnace bottom 11 simultaneously yet between the two.Described upper furnace body 10 is provided with opening for feed 12 and air outlet 13, described lower furnace bottom 11 have by perimembranous to center feed opening 14 staged descending domatic 15, see Fig. 4, described staged descending domatic 15 gradient α be 10-15 degree, the length L of every ladder is 5 to 10 times of height H, described lower furnace bottom 11 domatic 15 above be provided with coal distributing device 16, be provided with the chuck 17 of heat carrier circulation outside described upper furnace body 10 and lower furnace bottom 11, described chuck 17 has thermal barrier import 19 and heating medium outlet 20.See Fig. 3, described cold coke oven 5 is except without except chuck 17, and other agent structures are identical with Reaktionsofen 4 with drying oven 3, and are provided with spraying gun 21 in cold coke oven 5.
The pneumatic outlet of described drying oven 3 is connected with exhaust gas recovery system 6, and the leakage fluid dram of described exhaust gas recovery system 6 is connected through the opening for feed of pulping water metering outfit 30 with coal pulverizer 24, is also connected through the spraying gun 21 of force (forcing) pump 32 with cold coke oven 5 simultaneously.Described Reaktionsofen 4 is connected with gas-fired system 9 through coke tar recovery system 7, electric fishing system 8 with the air outlet 13 of cold coke oven 5, the exhanst gas outlet of described gas-fired system 9 is connected with the chuck of Reaktionsofen 4, the chuck of drying oven 3 successively, and the heating medium outlet 20 of the chuck 17 of described drying oven 3 is connected with the thermal barrier import 19 of drying oven 3 and the thermal barrier import 19 of Reaktionsofen 4 respectively.The profit outlet of described coke tar recovery system 7 is connected with the opening for feed of coal pulverizer 24 through oil-water separation system 27, Waste Water Treatment 28, pulping water metering outfit 29.The opening for feed of described coal pulverizer 24 is also connected with swirler 25 upper outlet and additive metering outfit 31, when bottom swirler 25, isolated fines (being less than the semicoke of 0.071mm size range) ratio is not enough, the coarse fodder that swirler 25 upper outlet is drawn can be recycled to coal pulverizer 24 levigate further, to ensure grade timing fines and coarse fodder proportioning on request.
For drying oven 3, material (low-rank coal) sends into (space between upper furnace body 10 and lower furnace bottom 11) in burner hearth through opening for feed 12, evenly fall under the effect of coal distributing device 15 on domatic 15 on the lower furnace bottom 11 of rotation, the coal grain of low-rank coal is dry by outer circumferential center edge rolling limit under the drive of revolving force on domatic 15, the stepped domatic 15 significantly rollings being conducive to coal grain, fully be heated and stressed cracking, improve the effect of depth drying, moisture-free coal after depth drying is sent by center feed opening 14, high-temperature flue gas is sent in chuck 17 by thermal barrier import 19 to keep the temperature of depth drying in stove, flue gas after heat exchange is discharged by heating medium outlet 20.
Process example:
1) depth drying: the low-rank coal being crushed to granularity≤50mm in coal bunker 1 is sent into after metering outfit 2 is weighed and carries out indirect heat exchange with the flue gas of 400 DEG C-600 DEG C from Reaktionsofen 4 chuck that passes in chuck in drying oven 3 and be warming up to 150 DEG C-200 DEG C depth drying 30-50min, obtain dried tail gas and moisture-free coal (moisture be less than 4%wt), the dried tail gas obtained is sent into exhaust gas recovery system 6 process and is obtained water of condensation and waste gas, described condensate portion delivers to the spraying gun 21 of cold coke oven 5 for being atomized quenching after force (forcing) pump 32 pressurizes, residue water of condensation is used as the opening for feed that pulping water sends into coal pulverizer 24 after pulping water metering outfit 30 is measured.
2) pyrolysis: moisture-free coal is sent into Reaktionsofen 4 by with carry out indirect heat exchange from the high-temperature flue gas being not less than 900 DEG C in gas-fired system 9 and be warming up to 400 DEG C-650 DEG C and carry out pyrolytic reaction 20-40min, obtain pyrolysis gas and hot semicoke;
3) semicoke cooling: hot semicoke is sent in cold coke oven 5 and contacts with the atomized water from exhaust gas recovery system 6 sprayed by spraying gun 21, by below the method fast cooling to 80 DEG C that is atomized quenching, the mist droplet particle size of described atomization quenching is 5-10 μm, water loss is no more than 30% of hot semicoke quality, a certain proportion of coke breeze and the burnt contact area increasing same droplet of grain is accounted in hot semicoke, obtain gas and cold semicoke, described gas and step 2) in send in coke tar recovery system 7 together with the pyrolysis gas that obtains and obtain moisture tar and raw gas, described raw gas is sent into after electric fishing system 8 reclaims tar further and is obtained coal gas, described coal gas part is sent into after the generation of gas-fired system 9 is not less than 900 DEG C of high-temperature flue gas and is sent in the chuck of Reaktionsofen and drying oven successively as thermal barrier, when the temperature of reaction in drying oven and Reaktionsofen is within the scope of design temperature, the flue gas going out dry anti-stove is all discharged as waste gas, when the temperature of reaction in drying oven and/or Reaktionsofen is higher than design temperature, the flue gas partial then going out dry anti-stove is recycled in the chuck in corresponding drying oven and/or Reaktionsofen to regulate the temperature of drying oven and/or Reaktionsofen within the scope of design temperature, ensure that the normal table of depth drying and pyrolytic reaction carries out.Described moisture tar is after oil-water separation system 27 isolates tar, and residue waste water is used as pulping water by after Waste Water Treatment 28 slightly process through pulping water metering outfit 29;
4) coal-grinding grating: by cold semicoke, pulping water is (when pulping water is not enough, fresh water can be filled into as pulping water) and additive (ZM-19 High-efficient Water slurry additive, the Central-South Chemical Co., Ltd. in Changzhou produces, take xylogen as main raw material, consumption is 0.3% of semicoke, wt) respectively through semicoke metering outfit 23, pulping water metering outfit 29, it is levigate to below 1mm that pulping water metering outfit 30 and additive metering outfit 31 send into coal pulverizer 24, send into swirler 25 again and carry out the rear grating of footpath grain separation, be specially: the semicoke of 1mm ~ 0.071mm size range: be less than the semicoke of 0.071mm size range by (4-6): the mass ratio of (6-4) carries out grating,
5) pulping: the compound (moisture) after grating is sent into whipping appts 26 mixing and make coal water slurry.
Low-rank coal described in embodiment selects Inner Mongol brown coal, and coal index is in table 1.
The brown coal ultimate analysis of table 1 Inner Mongol and technical analysis (wt, %)
Embodiment 1-3 is prepared according to above-mentioned processing method, and concrete reference is in table 2
The processing parameter of table 2 embodiment 1-3
Comparative example:
Comparative example 1, brown coal (composition is with table 1) are crushed to below 10mm in advance, then coal sample are laid in equably in pallet, and the constant temperature blast drying oven putting into 105 DEG C carries out drying, time of drying 8h, to deviate from moisture in coal.Dried coal sample uses ball mill to carry out coal-grinding sample preparation, and drum's speed of rotation is set in 170r/min, coal-grinding time 3min.Take coal sample, then add water and mix, re-use high speed electric agitator and stir 20min, be finally prepared into comparative example coal water slurry sample.The results are shown in Table 3.
Comparative example 2, brown coal (composition is with table 1) are crushed to below 10mm in advance, then coal sample are laid in equably in pallet, and the constant temperature blast drying oven putting into 105 DEG C carries out drying, time of drying 8h, to deviate from moisture in coal.Dried coal sample uses ball mill to carry out coal-grinding sample preparation, and drum's speed of rotation is set in 170r/min, coal-grinding time 3min.Take coal sample, then add water and additive (ZM-19 High-efficient Water slurry additive, consumption is 0.3%, wt of butt coal) and mix, re-use high speed electric agitator and stir 20min, be finally prepared into comparative example coal water slurry sample.The results are shown in Table 3.
Table 3 coal water slurry slurry performance
Remarks:
1. liquidity analysis adopt appearance method, be divided into excellent, good, in, differ from four grades.Excellent: smooth flow, uninterruptedly, good: to flow not smooth, have interruption, in: can not independently toward dirty, need by external force, poor: clustering phenomena is serious.
2. stability analysis adopt rod insert observation, coal water slurry sample is left standstill more than 12h and analyzes, be divided into excellent, good, in, differ from four grades.Excellent: without bleed, without precipitation, good: slight bleed, precipitate a little, in: precipitation is serious, poor: caking.
In table 3, semicoke best slurry concentration presents good mobility and stability at 62% (wt).The indexs such as the concentration in analytical table 3, viscosity, mobility and stability, the application's semicoke prepares the requirement that the concentration of coal water slurry, apparent viscosity, mobility and stability all meet coal water slurry gasification technology.The slurry concentration of embodiment of the present invention coal water slurry, compared to the slurry concentration of comparative example, at least improves 12 percentage points, Be very effective.
Claims (11)
1. low-rank coal prepares a method for high-concentration coal-water slurry, it is characterized in that, comprises the following steps:
1) depth drying: send into drying oven after low-rank coal is crushed to granularity≤50mm and carry out depth drying by the method for carrying out indirect heat exchange with thermal barrier, obtain dried tail gas and moisture-free coal;
2) pyrolysis: moisture-free coal is sent into Reaktionsofen and carry out pyrolysis by the method for carrying out indirect heat exchange with thermal barrier, obtain pyrolysis gas and hot semicoke;
3) semicoke cooling: hot semicoke to be sent in cold coke oven by below the method fast cooling to 80 DEG C of atomization quenching, obtain gas and cold semicoke;
4) coal-grinding: send into after cold semicoke and additive are added pulping water coal pulverizer levigate after carry out grating, be specially: the semicoke of 1mm ~ 0.071mm size range: be less than the semicoke of 0.071mm size range by (4-6): the mass ratio of (6-4) carries out grating;
5) pulping: the compound stirring and evenly mixing after grating is made coal water slurry.
2. low-rank coal as claimed in claim 1 prepares the method for high-concentration coal-water slurry, it is characterized in that, described step 1) in, the temperature of depth drying controls, at 150 DEG C-200 DEG C, to control time of drying at 30-50min; Described step 2) in, pyrolysis reaction temperature controls at 400 DEG C-650 DEG C, and pyrolysis time controls at 20-40min.
3. low-rank coal as claimed in claim 1 prepares the method for high-concentration coal-water slurry, it is characterized in that, described step 3) in, the mist droplet particle size of described atomization quenching is 5-10 μm, and water loss is no more than 30% of hot semicoke quality.
4. the low-rank coal as described in any one of claim 1-3 prepares the method for high-concentration coal-water slurry, it is characterized in that, the dried tail gas obtained in described step (1) is sent into exhaust gas recovery system process and is obtained water of condensation and waste gas, described condensate portion is recycled to for being atomized quenching in cold coke oven, and remainder water of condensation is as step 4) in pulping water send coal pulverizer opening for feed.
5. the low-rank coal as described in any one of claim 1-3 prepares the method for high-concentration coal-water slurry, it is characterized in that, described step 2) in the pyrolysis gas that obtains and step 3) in send in coke tar recovery system together with the gas that obtains and obtain moisture tar and raw gas, described raw gas is sent into after electric fishing system reclaims tar further and is obtained coal gas, described coal gas part is sent into after gas-fired system generates high-temperature flue gas and is first sent into Reaktionsofen and moisture-free coal indirect heat exchange to 400 DEG C-600 DEG C as thermal barrier, and then discharge as waste gas after sending into drying oven and low-rank coal indirect heat exchange, described moisture tar is isolated after tar through oil-water separation system and is remained waste water after Waste Water Treatment process as step 4) in pulping water send coal pulverizer opening for feed.
6. low-rank coal as claimed in claim 5 prepares the method for high-concentration coal-water slurry, it is characterized in that, when drying oven and/or Reaktionsofen inner drying or pyrolysis temperature too high time, thermal barrier part after the heat exchange that described drying oven is discharged is recycled in drying oven and/or Reaktionsofen chuck and mixes to regulate drying and/or pyrolysis temperature with thermal barrier, and rest part is discharged as waste gas.
7. the high-concentration coal-water slurry preparation system for any one of claim 1-6 method, it is characterized in that, comprise drying oven, Reaktionsofen, cold coke oven, coal pulverizer and the whipping appts of connecting successively, wherein, described drying oven, Reaktionsofen are identical with the furnace binding of cold coke oven, the lower furnace bottom comprising upper furnace body and can rotate, described upper furnace body is provided with opening for feed and air outlet, described lower furnace bottom has by perimembranous to descending domatic of center feed opening staged, and the domatic top of described lower furnace bottom is provided with coal distributing device; And be provided with the chuck of heat carrier circulation outside the upper furnace body of described drying oven and Reaktionsofen and lower furnace bottom, in described cold coke oven, be provided with spraying gun.
8. high-concentration coal-water slurry preparation system as claimed in claim 7, it is characterized in that, the air outlet of described drying oven is connected with exhaust gas recovery system, and the leakage fluid dram of described exhaust gas recovery system is connected with the spraying gun of cold coke oven and the opening for feed of coal pulverizer respectively.
9. high-concentration coal-water slurry preparation system as claimed in claim 7, it is characterized in that, described Reaktionsofen is connected with gas-fired system through coke tar recovery system, electric fishing system with the air outlet of cold coke oven, and the exhanst gas outlet of described gas-fired system is connected with the chuck of Reaktionsofen, the chuck of drying oven successively; The profit discharge port of described coke tar recovery system is connected with the opening for feed of coal pulverizer through water-and-oil separator, Waste Water Treatment successively; The heating medium outlet of described drying oven chuck is also connected with the thermal barrier import of drying oven chuck and Reaktionsofen chuck respectively.
10. the high-concentration coal-water slurry preparation system as described in any one of claim 7-9, is characterized in that, the descending domatic gradient of described drying oven, Reaktionsofen and cold coke oven staged is 10-15 degree, and the length of every ladder is 5 to 10 times of height.
11. high-concentration coal-water slurry preparation systems as claimed in claim 7, it is characterized in that, described coal pulverizer is connected with whipping appts through swirler.
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| CN106635208A (en) * | 2017-01-23 | 2017-05-10 | 河南理工大学 | Process for directly preparing coal water slurry from underflow of concentrator of coal preparation plant |
| CN109762612A (en) * | 2019-01-30 | 2019-05-17 | 浙江天禄环境科技有限公司 | A method of using waste water water-coal-slurry and passing through water-coal-slurry methanol |
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| CN110002933A (en) * | 2019-04-03 | 2019-07-12 | 浙江天禄环境科技有限公司 | A kind of method that low-order coal sub-prime prepares methanol and low-carbon alkene using Poly-generation |
| CN110055117A (en) * | 2019-04-03 | 2019-07-26 | 浙江天禄环境科技有限公司 | A kind of method that low-order coal sub-prime utilizes preparation water-coal-slurry |
| CN110002933B (en) * | 2019-04-03 | 2022-02-18 | 浙江天禄环境科技有限公司 | Method for preparing methanol and low-carbon olefin by poly-generation through low-rank coal quality-based utilization |
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