CN104741214A - System and method for preparing pulverized coal fuel of pulverized-coal boiler by using coal washing tailings - Google Patents
System and method for preparing pulverized coal fuel of pulverized-coal boiler by using coal washing tailings Download PDFInfo
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Abstract
The invention provides a system and method for preparing pulverized coal fuel of a pulverized-coal boiler by using coal washing tailings. The system includes a slurry mixing device, an impurity removing and coarse-grain material intercepting device, a grading recovery device, an ore pulp pretreatment device, a coal slime separating device, a coal slime water purifying device, a concentrate dehydration device and a thermal power drying device which are connected in a scientific mode. The method for preparing the pulverized coal fuel of the pulverized-coal boiler through the system comprises the steps of mixing ore pulp, removing impurities in the ore pulp, intercepting coarse-grain materials in the ore pulp, feeding the ore pulp into the grading recovery device for grading, adding floatation agents for pretreatment, feeding the ore pulp into a fine-grain coal slime separating device for separation, dehydrating and drying selected concentrate, feeding the tailings into a coal slime water treatment device for solid-liquid separation, and recycling purified tailing water. By means of the system and method for preparing the pulverized coal fuel of the pulverized-coal boiler by using the coal washing tailings, the pulverized coal fuel meeting the combustion requirements of the pulverized-coal fluidized bed boiler is prepared without the grinding step, emission of the coal washing tailings is reduced, the environment is protected, comprehensive utilization of resources is realized, resources are saved, and the utilization efficiency of coal resources is improved.
Description
Technical field
The present invention relates to a kind of fuel coal dust technology of preparing, specifically a kind of use discard coal washing mine tailing, meet the system and method for the fuel coal dust of pulverized coal boiler combustion requirements without the preparation of abrasive dust link.
Background technology
Pulverized coal boiler is a kind of novel industrial boiler of China's development, coal saving rate >=40%, efficiency of combustion >=98%, boiler thermal output >=90%, disposal of pollutants level is suitable with natural gas boiler, has efficient, energy-conservation, clean feature, is the novel energy-conserving technology that state key encourages to promote.
But the fuel coal dust of pulverized-coal fired boiler has comparatively strict requirement: granularity≤0.074mm content is greater than 85%; caloric value >=5000 kilocalorie/kg; moisture≤8%; existing fuel pulverized coal preparation generally all adopts thermal coal abrasive dust technology; milling process produces a large amount of energy consumption and dust, is unfavorable for energy-saving and emission-reduction and environmental protection.
Summary of the invention
Goal of the invention of the present invention adopts abrasive dust to prepare pulverized coal boiler fuel coal dust for prior art; cause a large amount of power consumption and produce a large amount of dust; be unfavorable for the deficiency of energy-saving and emission-reduction and environmental protection; one is to provide the system that a kind of coal washing mine tailing prepares pulverized coal boiler fuel coal dust, and two are to provide a kind of method using discarded coal washing mine tailing, meet the fuel coal dust of pulverized coal boiler combustion requirements without the preparation of abrasive dust link.
The technical scheme realizing the employing of foregoing invention object is:
A kind of coal washing mine tailing prepares the system of pulverized coal boiler fuel coal dust, the equipment that this system uses comprises: size mixing equipment, removal of impurities, cut thick equipment, classification reclaimer, ore pulp pre-processing device, slime separation equipment, black water cleaning equipment, essence mine dehydration equipment, heating power drying equipment, it is characterized in that, the discharging opening of described size mixing equipment and removal of impurities, the feeding mouth cutting thick equipment connects, removal of impurities, the outlet cutting thick equipment is connected with the feeding mouth of classification reclaimer, the outlet of classification reclaimer is connected with the feeding mouth of ore pulp pre-processing device, ore pulp pre-processing device discharging opening is connected with the feeding mouth of slime separation equipment, the mine tailing outlet of slime separation equipment is connected with the feeding mouth of black water cleaning equipment, the concentrate outlet of slime separation equipment is connected with the feeding mouth of essence mine dehydration equipment, the treated water outlet of black water cleaning equipment is connected with the water inlet of adding adding water inlet and ore pulp pre-processing device of size mixing equipment, the dehydration product outlet of essence mine dehydration equipment is connected with the feeding mouth of heat-force dry equipment, filtrate (liquid and the size mixing equipment of essence mine dehydration equipment are added water inlet and ore pulp pre-processing device and are added water inlet and be connected.
The system that coal washing mine tailing prepares pulverized coal boiler fuel coal dust prepares a method for pulverized coal boiler fuel coal dust, said method comprising the steps of:
A. coal waste charcoal washing fine fraction mine tailing be modulated into the ore pulp of concentration 50 ~ 500g/L or directly use coal preparation plant's coal washing mine tailing ore pulp;
B. by ore pulp removal of impurities, cut thick after feed the classification of classification reclaimer, and right+0.075mm coarse fraction material dewatering reclaims;
C.-0.075mm grade ore pulp step b classification gone out feeds ore pulp pre-processing device and adds floating agent pretreatment, and the adjustment pulp density that adds water is to 50 ~ 200g/L;
D. pretreated ore pulp is fed the sorting of fine fraction slime separation equipment, select moisture below 8% time caloric value reach the concentrate of 5000 kilocalorie/more than kg;
E. essence mine dehydration steps d selected, dry, moisture is reduced to less than 8%
F. steps d is sub-elected the mine tailing after concentrate and feed slime water treatment equipment, Separation of Solid and Liquid, the tailing water after purification recycles.
As preferably, described step b and step c sequencing can exchange.
As preferably, the medicament that selects that ore pulp pre-processing device adds is coal slime flotation collector and foaming agent, also can be the composite drug having collecting function and foaming function concurrently.
As preferably, when the pulp density that step b classification goes out meets the demands, directly ore pulp is fed screening installation sorting.
As preferably, the coal slime that buoyancy can be good, by floating agent with add water and directly join in floatation equipment.
As preferably rinsing the one in sizing mixing, or use two or more the combination of the said equipment.
As preferably, the ore pulp removal of impurities described in step b, cut one or more the combination that thick equipment adopts sieve bend, linear vibrating screen, electromagnetic sieve, classifying cyclone.
As preferably, the classification reclaimer described in step c is Horizontal sedimentation filter centrifugation dewaterer.
As preferably, the fine fraction slime separation equipment use agitation impeller flotator described in steps d, air jet flotation machine, flotation column.
Step e essence mine dehydration can adopt chamber filter press, plate and frame type filter-press, belt filter press, and the product moisture after dehydration should lower than 35%, and then use heat-force dry that coal dust is dried to moisture less than 8%.
Adopt technique scheme, compared with preparing pulverized coal boiler fuel coal dust technology with existing thermal coal abrasive dust, the present invention uses discarded coal washing mine tailing, the fuel coal dust of PC-FB boiler combustion requirement is met without the preparation of abrasive dust link, reduce the discharge of coal washing mine tailing, protect environment, achieve the comprehensive utilization of resource, improve the utilization ratio of coal resources; The fuel coal dust prepared instead of fuel coal dust prepared by thermal coal abrasive dust, decreases the consumption of coal resources, has saved resource; Discarded fine fraction coal washing mine tailing is used to prepare pulverized coal boiler fuel coal dust; take full advantage of the feature that raw material granularity is thin; pulverized coal boiler bunker coal powder, preparation method thereof uses raw material to be coal washing mine tailing; not only reduce the discharge of coal washing mine tailing; do not need abrasive dust link; save the energy consumption of abrasive dust link, facilitate energy-saving and cost-reducing, reduction of discharging, energy-saving and cost-reducing and environmental protection are all had great importance.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
In figure: size mixing equipment 1, removal of impurities, section thick equipment 2, classification reclaimer 3, ore pulp pre-processing device 4, slime separation equipment 5, black water cleaning equipment 6, essence mine dehydration equipment 7, heating power drying equipment 8.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
The invention provides the discarded coal washing mine tailing of a kind of use, prepare pulverized coal boiler fuel coal dust technology without abrasive dust link, the equipment that the process system realizing this technology uses has: size mixing equipment 1, removal of impurities, section thick equipment 2, classification reclaimer 3, ore pulp pre-processing device 4, slime separation equipment 5, black water cleaning equipment 6, essence mine dehydration equipment 7, heating power drying equipment 8, its syndeton is shown in Fig. 1.Wherein size mixing equipment 1 discharging opening and removal of impurities, cut thick equipment 2 feeding mouth to connect, removal of impurities, cut thick equipment 2 slurry outlet to be connected with classification reclaimer 3 feeding mouth, classification reclaimer 3 fine fraction slurry outlet is connected with ore pulp pre-processing device 4 feeding mouth, ore pulp pre-processing device 4 discharging opening is connected with slime separation equipment 5 feeding mouth, the mine tailing outlet of slime separation equipment 5 is connected with the feeding mouth of black water cleaning equipment 6, the concentrate outlet of slime separation equipment 5 is connected with the feeding mouth of essence mine dehydration equipment 7, the treated water outlet of black water cleaning equipment 6 is connected with the water inlet of adding adding water inlet and ore pulp pre-processing device 4 of size mixing equipment 1, the dehydration product outlet of essence mine dehydration equipment 7 is connected with the feeding mouth of heat-force dry equipment 8, the filtrate (liquid of essence mine dehydration equipment 7 is also added water inlet and ore pulp pre-processing device 4 and is added water inlet and be connected with size mixing equipment 1.
Coal washing mine tailing and water are at the uniform velocity fed in size mixing equipment 1 by a certain percentage, be modulated into the ore pulp of concentration 50 ~ 500g/L, the ore pulp modulated enters removal of impurities, cut thick equipment 2, the foreign material of amputation granularity >=0.5 ~ 5.0mm, removal of impurities, cut the ore pulp slightly and enter classification reclaimer 3, classification is carried out with 0.100mm ~ 0.030mm granularity, and the part of right >=0.100mm ~ 0.030mm grade carries out dehydration recovery, ≤ 0.100mm ~ 0.030mm grade ore pulp enters ore pulp pre-processing device 4, add foaming agent, floating agents such as collecting agent and add water, pretreatment is carried out to ore pulp, and adjust concentration to the 50 ~ 200g/L being applicable to slime separation equipment 5 sorting, complete pretreated ore pulp and enter slime separation equipment 5 sorting, sub-elect concentrate and tailings, concentrate feeds essence mine dehydration equipment 7 and dewaters, after dehydration, the dehydration product of moisture≤35% feeds in heat-force dry equipment 8 and carries out heat-force dry, moisture is reduced to≤8%, become fuel coal dust product, mine tailing then enters black water cleaning equipment 6 and realizes Separation of Solid and Liquid, complete water suction purification, the filtrate that wash water after purification and essence mine dehydration equipment 7 are deviate from returns size mixing equipment 1 and ore pulp pre-processing device 4 and adds water circulation and use.
Specific embodiments of the invention
Embodiment 1 coal washing mine tailing prepares the system of pulverized coal boiler fuel coal dust.
See Fig. 1, the equipment of employing has: size mixing equipment 1, removal of impurities, section thick equipment 2, classification reclaimer 3, ore pulp pre-processing device 4, slime separation equipment 5, black water cleaning equipment 6, essence mine dehydration equipment 7, heat-force dry equipment 8.The present embodiment: TJQ2500 type paste mixer selected by size mixing equipment 1, staving diameter 2500mm, wheel speed 400r/min, disposal ability 50t/h, removal of impurities, cut thick equipment 2 and select VOSB122060 type vibration sieve bend, sieve plate step sizing 2.0mm, cut coarseness 1.0mm, LWZ1400 × 1800 type Horizontal sedimentation perforated basket centrifuge selected by classification reclaimer 3, disposal ability 40 ~ 70t/h, ore pulp pre-processing device 4 selects PAD2500 type gravity current stance ore pulp preprocessor, slime separation equipment 5 selects XJM-S20 × 4 type agitation impeller flotator, single groove volume 20m
3, total measurement (volume) 80m
3, disposal ability 40 ~ 70t/h, ITT Φ 15 type pipe chute thickener selected by black water cleaning equipment 6, and essence mine dehydration equipment 7 selects 2 KXGZ300/1600-U type fast opening pressure filters, and monofilament filter cloth, heat-force dry equipment 8 selects FR1500 hot air drying system.Its syndeton is shown in Fig. 1, size mixing equipment 1 TJQ2500 type paste mixer discharging opening and removal of impurities, cut thick equipment 2 VOSB122060 type vibration sieve bend feeding mouth to connect, removal of impurities, cut thick equipment 2 VOSB122060 type vibration sieve bend slurry outlet to be connected with classification reclaimer 3 LWZ1400 × 1800 type Horizontal sedimentation perforated basket centrifuge feeding mouth, classification reclaimer 3 LWZ1400 × 1800 type Horizontal sedimentation perforated basket centrifuge fine fraction slurry outlet is connected with ore pulp pre-processing device 4 PAD2500 type gravity current stance ore pulp preprocessor feeding mouth, ore pulp pre-processing device 4 PAD2500 type gravity current stance ore pulp preprocessor discharging opening is connected with slime separation equipment 5 XJM-S20 × 4 type agitation impeller flotator feeding mouth, the mine tailing outlet of slime separation equipment 5 XJM-S20 × 4 type agitation impeller flotator is connected with the feeding mouth of black water cleaning equipment 6 ITT Φ 15 type pipe chute thickener, the concentrate outlet of slime separation equipment 5 XJM-S20 × 4 type agitation impeller flotator is connected with the feeding mouth of essence mine dehydration equipment 7 KXGZ300/1600-U type fast opening pressure filter, the treated water outlet of black water cleaning equipment 6 ITT Φ 15 type pipe chute thickener is connected with the water inlet of adding adding water inlet and ore pulp pre-processing device 4 PAD2500 type gravity current stance ore pulp preprocessor of size mixing equipment 1 TJQ2500 type paste mixer, the dehydration product outlet of essence mine dehydration equipment 7 KXGZ300/1600-U type fast opening pressure filter is connected with the feeding mouth of heat-force dry equipment 8 FR1500 hot air drying system, the filtrate (liquid of essence mine dehydration equipment 7 KXGZ300/1600-U type fast opening pressure filter is also added water inlet and ore pulp pre-processing device 4 PAD2500 type gravity current stance ore pulp preprocessor and is added water inlet and be connected with size mixing equipment 1 TJQ2500 type paste mixer.
Embodiment 2 system described in embodiment 1 prepares the method for pulverized coal boiler fuel coal dust.
Concrete steps are as follows:
A. coal waste charcoal washing fine fraction mine tailing ore pulp size mixing equipment be modulated into the ore pulp of concentration 50 ~ 500g/L or directly use coal preparation plant's coal washing mine tailing ore pulp; Ore pulp size mixing equipment uses the one during agitator is sized mixing, paste mixer is sized mixing, high pressure water washing is sized mixing, or uses two or more the combination of the said equipment.
B. by ore pulp removal of impurities, cut thick after feed the classification of classification reclaimer, and right+0.075mm coarse fraction material dewatering reclaims; When the pulp density that classification goes out meets the demands, directly ore pulp is fed screening installation sorting.Ore pulp removal of impurities, section thick equipment adopt the one of sieve bend, linear vibrating screen, electromagnetic sieve, classifying cyclone.
C.-0.075mm grade ore pulp step b classification gone out feeds ore pulp pre-processing device and adds floating agent pretreatment, and the adjustment pulp density that adds water is to 50 ~ 200g/L; Floatability can good coal slime, can not use ore pulp pre-processing device, by floating agent with add water and directly join in floatation equipment.Classification reclaimer is Horizontal sedimentation filter centrifugation dewaterer.
D. pretreated ore pulp is fed the sorting of fine fraction slime separation equipment, select moisture below 8% time caloric value reach the concentrate of 5000 kilocalorie/more than kg; Fine fraction slime separation equipment use agitation impeller flotator, air jet flotation machine, flotation column.
E. essence mine dehydration steps d selected, drying, is reduced to less than 8% by moisture, and essence mine dehydration can adopt chamber filter press, plate and frame type filter-press, belt filter press, product moisture after dehydration should lower than 35%, and then use heat-force dry that coal dust is dried to moisture less than 8%.
F. steps d is sub-elected the mine tailing after concentrate and feed slime water treatment equipment, Separation of Solid and Liquid, the tailing water after purification recycles.
Step b and step c sequencing can exchange.
Concrete operations embodiment
The ratio of coal washing mine tailing and water by volume 1:3 is at the uniform velocity fed in size mixing equipment 1 TJQ2500 type paste mixer, be modulated into the ore pulp of concentration 300g/L, the ore pulp modulated enters removal of impurities, cut thick equipment 2 VOSB122060 type vibration sieve bend, the foreign material of amputation granularity >=1.0mm, removal of impurities, cut the ore pulp slightly and enter classification reclaimer 3 LWZ1400 × 1800 type Horizontal sedimentation perforated basket centrifuge, classification is carried out with 0.075mm granularity, and the part of right >=0.075mm grade carries out dehydration recovery, ≤ 0.075mm grade ore pulp enters ore pulp pre-processing device 4 PAD2500 type gravity current stance ore pulp preprocessor, add foaming agent, floating agents such as collecting agent and add water, pretreatment is carried out to ore pulp, and adjust concentration to the 80g/L being applicable to the type agitation impeller flotator sorting of slime separation equipment 5 XJM-S20 × 4, complete pretreated ore pulp and enter the type agitation impeller flotator sorting of slime separation equipment 5 XJM-S20 × 4, sub-elect concentrate and tailings, concentrate feeds the dehydration of essence mine dehydration equipment 7 KXGZ300/1600-U type fast opening pressure filter, after dehydration moisture be 25% ~ 27% dehydration product feed in heat-force dry equipment 8 FR1500 hot air drying system and carry out heat-force dry, moisture is reduced to 4.0%, become fuel coal dust product, mine tailing then enters black water cleaning equipment 6 ITT Φ 15 type pipe chute thickener and realizes Separation of Solid and Liquid, complete wash water purification, the filtrate that wash water after purification and essence mine dehydration equipment 7 are deviate from returns size mixing equipment 1 TJQ2500 type paste mixer and ore pulp pre-processing device 4 PAD2500 type gravity current stance ore pulp preprocessor and adds water circulation and use.
Such as agitator selected by size mixing equipment 1 of the present invention, removal of impurities, cut thick equipment 2 and select linear vibrating screen, electromagnetic sieve or classifying cyclone, ore pulp pre-processing device 4 selects XY type impeller stirring-type ore pulp preprocessor, kaskad apparatus for pre-flotation pulp conditioning, agitator, duct type coal paste preprocessor and atomized fall type ore pulp preprocessor, slime separation equipment 5 selects other such as air jet flotation machine or flotation column, raker thickener selected by black water cleaning equipment 6, deep cone thickener or inclined plate depositing tank, essence mine dehydration equipment 7 selects pressing filter, disc vacuum filter or vibrating-dewatering screen, its connected mode and the same above-described embodiment of operating function.
Claims (10)
1. prepare the system of pulverized coal boiler fuel coal dust with coal washing mine tailing for one kind, the equipment that this system uses comprises: size mixing equipment, removal of impurities, cut thick equipment, classification reclaimer, ore pulp pre-processing device, slime separation equipment, black water cleaning equipment, essence mine dehydration equipment, heating power drying equipment, it is characterized in that, the discharging opening of described size mixing equipment and removal of impurities, the feeding mouth cutting thick equipment connects, removal of impurities, the outlet cutting thick equipment is connected with the feeding mouth of classification reclaimer, the outlet of classification reclaimer is connected with the feeding mouth of ore pulp pre-processing device, ore pulp pre-processing device discharging opening is connected with the feeding mouth of slime separation equipment, the mine tailing outlet of slime separation equipment is connected with the feeding mouth of black water cleaning equipment, the concentrate outlet of slime separation equipment is connected with the feeding mouth of essence mine dehydration equipment, the treated water outlet of black water cleaning equipment is connected with the water inlet of adding adding water inlet and ore pulp pre-processing device of size mixing equipment, the dehydration product outlet of essence mine dehydration equipment is connected with the feeding mouth of heat-force dry equipment, filtrate (liquid and the size mixing equipment of essence mine dehydration equipment are added water inlet and ore pulp pre-processing device and are added water inlet and be connected.
2. prepare as claimed in claim 1 a method for pulverized coal boiler fuel coal dust by the system that coal washing mine tailing prepares pulverized coal boiler fuel coal dust, it is characterized in that, said method comprising the steps of:
A. coal waste charcoal washing fine fraction mine tailing size mixing equipment be modulated into the ore pulp of concentration 50 ~ 500g/L or directly use coal preparation plant's coal washing mine tailing ore pulp;
B. by ore pulp removal of impurities, cut thick after feed the classification of classification reclaimer, and right+0.075mm coarse fraction material dewatering reclaims;
C.-0.075mm grade ore pulp step b classification gone out feeds ore pulp pre-processing device and adds floating agent pretreatment, and the adjustment pulp density that adds water is to 50 ~ 200g/L;
D. pretreated ore pulp is fed the sorting of fine fraction slime separation equipment, select moisture below 8% time caloric value reach the concentrate of 5000 kilocalorie/more than kg;
E. essence mine dehydration steps d selected, dry, moisture is reduced to less than 8%;
F. steps d is sub-elected the mine tailing after concentrate and feed slime water treatment equipment, Separation of Solid and Liquid, the tailing water after purification recycles.
3. pulverized coal boiler bunker coal powder, preparation method thereof according to claim 2, is characterized in that, described step b and step c sequencing can exchange.
4. coal washing mine tailing according to claim 2 prepares the method for pulverized coal boiler fuel coal dust, it is characterized in that, the medicament that selects that ore pulp pre-processing device adds is coal slime flotation collector and foaming agent, also can be the composite drug having collecting function and foaming function concurrently.
5. coal washing mine tailing according to claim 1 prepares the method for pulverized coal boiler fuel coal dust, it is characterized in that, when the pulp density that step b classification goes out meets the demands, directly ore pulp is fed screening installation sorting.
6. coal washing mine tailing according to claim 1 prepares the method for pulverized coal boiler fuel coal dust, it is characterized in that, floatability can good coal slime, by floating agent with add water and directly join in floatation equipment.
7. pulverized coal boiler bunker coal powder, preparation method thereof according to claim 2, it is characterized in that, ore pulp size mixing equipment described in step a uses the one during agitator is sized mixing, paste mixer is sized mixing, high pressure water washing is sized mixing, or uses two or more the combination of the said equipment.
8. pulverized coal boiler bunker coal powder, preparation method thereof according to claim 2, is characterized in that, the ore pulp removal of impurities described in step b, section thick equipment adopt one or more combination of sieve bend, linear vibrating screen, electromagnetic sieve, classifying cyclone.
9. pulverized coal boiler bunker coal powder, preparation method thereof according to claim 2, is characterized in that, the classification reclaimer preferred Horizontal sedimentation filter centrifugation dewaterer described in step c.
10. pulverized coal boiler bunker coal powder, preparation method thereof according to claim 2, is characterized in that, the fine fraction slime separation equipment use agitation impeller flotator described in steps d, air jet flotation machine, flotation column.
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