CN108034438B - High-temperature semicoke humidifying method and device - Google Patents
High-temperature semicoke humidifying method and device Download PDFInfo
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- CN108034438B CN108034438B CN201711134012.3A CN201711134012A CN108034438B CN 108034438 B CN108034438 B CN 108034438B CN 201711134012 A CN201711134012 A CN 201711134012A CN 108034438 B CN108034438 B CN 108034438B
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/04—Wet quenching
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- C—CHEMISTRY; METALLURGY
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- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/10—Cooling or quenching coke combined with agitating means, e.g. rotating tables or drums
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Abstract
The invention relates to a high-temperature semicoke humidifying method and a device, wherein the method comprises the steps of mixing fine-particle semicoke with water to form semicoke slurry; and adding semicoke to be humidified into a humidifying mixer, and spraying semicoke slurry into the humidifying mixer for humidifying and stirring. The device comprises a fine particle semicoke pulping device and a humidifying stirrer, wherein the humidifying stirrer comprises a tank body, a semicoke inlet to be humidified, a semicoke slag slurry inlet and a humidifying coke slurry outlet; the fine particle semicoke pulping device comprises a fine particle semicoke inlet, a water inlet and a semicoke slurry outlet, wherein the semicoke slurry outlet is connected with the semicoke slurry inlet through a slurry pump, and a nozzle is arranged at the semicoke slurry inlet. According to the invention, the coke powder slurry is used for replacing humidified water, so that the surface tension is obviously smaller than that of water, the affinity of high-temperature coke powder is strong, the hot semicoke and semicoke slag slurry are easier to mix, the condition that the coke powder floats on the water surface and is difficult to mix is avoided, and meanwhile, the problem that a large amount of steam carries dust to leak is also solved.
Description
Technical Field
The invention relates to the field of semicoke cooling and humidifying, in particular to a high-temperature semicoke humidifying method and device.
Background
In the coal resources of China, the proportion of young coal with higher volatile matters is larger, the young coal with the volatile matters of the dry base more than 28 percent accounts for about 3/4 of the national coal reserves, and the young coal with the volatile matters of the dry base more than 35 percent accounts for about 50 percent of the national coal reserves. The direct-fired coal in China accounts for about 80% of the total coal amount, and more than half of the direct-fired coal is used for power generation, and chemical energy in many young coals is completely converted into heat energy, so that potential oil, gas and chemicals with high added values in the young coals are wasted.
In order to better utilize lignite and long flame coal resources in China, in recent years, the production of semicoke and pyrolysis gas after pyrolysis of low-rank coal is a new process which is used effectively, wherein the cooling of semicoke and semicoke powder produced after pyrolysis of coal is a key link, in particular to the cooling of coke powder.
In order to prevent spontaneous combustion of semicoke and facilitate transportation, and simultaneously in order to prevent dust and facilitate storage, the coke powder needs to be properly humidified. Therefore, the above processes have the cooling and humidifying processes of the produced high-temperature coke powder.
The high-temperature coke powder cooling and humidifying are difficult at present because the temperature of the coke powder at the cyclone outlet of the pyrolysis furnace is higher, and meanwhile, the hydrophilicity of semicoke is poor, especially the coke powder is more obvious, and the higher the temperature is, the worse the affinity is.
The main aspects are as follows:
1. the high-temperature coke powder and water are directly mixed, the coke powder easily floats on the water surface, the mixing is difficult, and the humidifying and stirring effects are poor.
2. If water is directly sprayed in the high-temperature coke powder, steam is easy to generate, and the high-temperature coke powder expands rapidly, so that the safe and stable operation of equipment is affected.
In the prior art, as shown in fig. 1, pyrolysis gas at a pyrolysis gas outlet of a pyrolysis furnace firstly enters a primary cyclone dust collector, most of coarse particle dust is removed, then enters a secondary cyclone dust collector, further dust is removed, the coarse particle dust in the pyrolysis gas is firstly collected through cyclone dust removal, and is discharged through a lower ash discharge valve. Then the pyrolysis gas carries the residual dust to enter a secondary cyclone dust collector, the dust in the pyrolysis gas is further collected by the cyclone dust collector and is discharged through a dust discharging valve at the lower part, and more than 90% of high-temperature semicoke in the pyrolysis gas is separated through the front two-stage cyclone dust collector. The rest pyrolysis gas and a small part of semi-coke powder are discharged from the secondary cyclone dust collector to enter the next working procedure.
Semi-coke powder in pyrolysis gas collected from the two-stage cyclone dust collector is discharged from the lower part of the dust collector and enters a humidifying agitator, meanwhile, water enters the humidifying agitator through a nozzle, the water and the semi-coke are stirred and mixed for a long time, and then wet semi-coke with the water content of about 15-30% is changed into a water-coke slurry system for pulping or a storage bin for storage.
In the semicoke treatment mode, semicoke directly enters a humidifying stirrer, the temperature of the discharged hot semicoke is high, about 750-650 ℃, and the temperature of circulating water is 30-40 ℃. The hot semicoke is directly mixed with circulating water, so that the thermal expansion is increased, part of dust is easy to carry in the steam discharging process, namely, the dust is easy to overflow, the sealing performance of equipment is influenced, the equipment is damaged greatly, and the service life of the equipment is shortened. Therefore, the coke is cooled by the cooling machine and then enters the humidifying agitator, so that the system investment is increased.
Disclosure of Invention
The invention aims at solving the problems and aims at providing a high-temperature semicoke humidifying method and a device.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in one aspect, according to an embodiment of the present invention, there is provided a high temperature semicoke humidifying method including:
mixing fine-particle semicoke with water to form semicoke slurry;
and adding semicoke to be humidified into a humidifying mixer, and spraying the semicoke slurry into the humidifying mixer for humidifying and stirring to obtain humidifying coke slurry.
Further, the fine particle carbocoal is fine particle carbocoal with more than 90 percent of granularity not more than 0.074mm.
Further, the semicoke to be humidified is semicoke collected by a primary cyclone dust collector, and the fine particle semicoke is semicoke collected by a secondary cyclone dust collector.
Further, in the semicoke slurry, the mass content of fine particles of semicoke is 5-30%, the mass content of water is 70-95%, preferably, the mass content of fine particles of semicoke is 5-10%, and the mass content of water is 80-90%.
Further, the moisture content of the humidified coke slurry is 40-50% by mass.
Further, the fine particle semicoke is 5% -20% of the total mass of semicoke collected by the primary cyclone dust collector and semicoke collected by the secondary cyclone dust collector.
On the other hand, the embodiment of the invention also provides a high-temperature semicoke humidifying device which comprises a fine particle semicoke pulping device and a humidifying agitator, wherein,
the humidifying stirrer comprises a tank body, a semicoke inlet to be humidified, a semicoke slurry inlet, a humidifying coke slurry outlet and a stirring device, wherein the semicoke inlet, the semicoke slurry inlet and the humidifying coke slurry outlet are arranged on the tank body;
the fine-particle semicoke pulping device comprises a fine-particle semicoke inlet, a water inlet and a semicoke slurry outlet, wherein the semicoke slurry outlet is connected with the semicoke slurry inlet through a slurry pump, and a nozzle is arranged at the semicoke slurry inlet.
Further, the semicoke inlet to be humidified is communicated with a dust collection bin of the primary cyclone dust collector;
the fine particle semicoke inlet is communicated with a dust collection bin of the secondary cyclone dust collector.
Further, the lower end of the dust collection bin is provided with an ash discharge valve.
Further, the humidifying coke slurry outlet is communicated with the humidifying coke slurry storage device through a pipeline, and a slurry pump is arranged on the pipeline.
Further, the primary cyclone dust collector is communicated with a high-temperature semicoke powder outlet of the pyrolysis furnace.
Further, an air inlet of the secondary cyclone dust collector is communicated with a pyrolysis gas outlet of the primary cyclone dust collector.
Further, a pyrolysis gas outlet is arranged at the upper end of the secondary cyclone dust collector.
Further, the fine particle semicoke pulping device is a GZJ-500 type high-speed pulping machine.
The beneficial effects of the invention are as follows:
according to the invention, the humidified water is replaced by the coke powder slurry, and the surface tension of the slurry is generally 0.03-0.05N/m, and the surface tension of the water at normal temperature is generally 0.073N/m, so that the surface tension of the slurry is obviously smaller than that of the water, the affinity of the slurry with high-temperature coke powder is increased, the hot semicoke and the semicoke slag slurry are easier to mix, and the condition that the coke powder floats on the water surface and is difficult to mix is avoided. Meanwhile, the problem that a large amount of steam carries dust to leak is also eliminated.
The thin coke slurry is prepared by using fine particle semicoke with the granularity not larger than 0.074mm and more than 90%, the particles are smaller, and the prepared thin slurry can be sprayed into a humidifying mixer through nozzle atomization, so that the blockage of the nozzle is prevented, and the atomization of the thin slurry is facilitated.
The fine particle semicoke is from semicoke after the separation of the second-stage cyclone dust collector, and when the fine particle semicoke is mixed with water, the semicoke temperature is lower than that obtained by the first-stage cyclone dust collector, and the water consumption is lower.
Drawings
FIG. 1 is a prior art carbocoal humidifying device;
fig. 2 is a schematic structural diagram of a high-temperature semicoke humidifying device according to an embodiment of the invention.
Wherein: 1. the device comprises a primary cyclone dust collector, a secondary cyclone dust collector, a fine particle semicoke pulping device, a 4 humidifying stirrer, a 5 fine particle semicoke inlet, a 6 water inlet, a 7 semicoke slurry outlet, an 8 semicoke inlet to be humidified, a 9 semicoke slurry inlet, a 10 slag slurry pump, an 11 humidifying semicoke slurry outlet, a 12 pyrolysis furnace, a 13 high-temperature semicoke powder outlet, a 14 ash discharge valve.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a high-temperature semicoke humidifying method, which comprises the following steps:
mixing fine-particle semicoke with water to form semicoke slurry;
and adding semicoke to be humidified into the humidifying mixer 4, and spraying the semicoke slurry into the humidifying mixer 4 for humidifying and stirring to obtain humidifying coke slurry.
In the embodiment, the semi-coke slurry, namely the coke powder slurry is used for replacing humidified water, and the surface tension of the slurry is generally 0.03-0.05N/m, and the surface tension of the water at normal temperature is generally 0.073N/m, so that the surface tension of the slurry is obviously smaller than that of the water, the affinity of the slurry with high-temperature coke powder is increased, the hot semi-coke and the semi-coke slurry are easier to mix, the condition that the coke powder floats on the water surface and is difficult to mix is avoided, and the problem that a large amount of steam carries dust to leak is also eliminated. Compared with the existing coke cooling machine and the process of the combined action of the coke cooling machine and the humidifying agitator 4, the process equipment is simplified, and the equipment investment is reduced.
In the above embodiment, the fine particle semicoke is preferably fine particle semicoke with a particle size of not more than 90% and not more than 0.074mm. In the semicoke slag slurry, the mass content of fine particles is 5-30%, and the mass content of water is 70-95%. The mass percentage of the water content of the humidified coke slurry is 40-50%. The fine particle semicoke is 5% -20% of the total mass of semicoke collected by the primary cyclone dust collector and semicoke collected by the secondary cyclone dust collector. Semi-coke particles in the semi-coke slurry are smaller, and the prepared slurry can be atomized and sprayed into the humidifying agitator 4 through the nozzle, so that the blockage of the nozzle is prevented, and the atomization of the slurry is facilitated.
Further, since pulverized coal reacts in the fast pyrolysis furnace 12, high-temperature semicoke and pyrolysis gas are generated. The pyrolysis gas carries high-temperature semicoke powder out of a high-temperature semicoke powder outlet 13, and firstly enters a primary cyclone dust collector 1, wherein about 70-80% of high-temperature semicoke is collected and enters a high-temperature semicoke inlet of a humidifying agitator 4 through a primary cyclone lower ash discharge valve 14. The pyrolysis gas and the remaining dust then enter a secondary cyclone to further collect the remaining finer dust. The method has the characteristics of small collection amount and finer granularity, the collection amount is only 3-10% of the primary cyclone ash collection amount, and the granularity of more than 90% is less than or equal to 0.074mm. According to the characteristics, two-stage cyclone dust removal ash is used for different purposes, and firstly, the secondary cyclone dust removal ash and water are stirred to prepare dilute coke slurry, namely, as shown in fig. 2, semicoke to be humidified is semicoke collected by the primary cyclone dust collector 1, and fine particle semicoke is semicoke collected by the secondary cyclone dust collector 2. In the dilute coke slurry, the content of coke powder is 5% -30% and the content of water is 70% -95%, and then the dilute slurry and the dust-removing ash of the primary cyclone dust remover 1 are mixed in the humidifying mixer 4 to prepare the water coke slurry with the water content of 40% -50%.
In one embodiment of the invention, the specific operation of high-temperature semicoke humidification is as follows: the high-temperature semicoke powder collected by the secondary cyclone dust collector 2, namely fine semicoke, enters the fine semicoke pulping device 3 (such as a high-speed pulping machine) through the lower ash discharge valve 14. The high-speed pulping machine has the function of mixing the coke powder and water to prepare slurry, and the prepared slurry enters a nozzle of the humidifying agitator 4 through a slurry pump 10, is atomized through an atomizing nozzle and is humidified and agitated with the high-temperature semicoke separated by the primary cyclone dust collector 1.
Because the high-temperature coke powder, namely the semicoke to be humidified, can be timely mixed with the dilute coke slurry, the mixing speed is high, the dust carried in the evaporation and discharge process of the water vapor is greatly reduced, and the requirement of direct humidification of the high-temperature semicoke powder is met.
As shown in fig. 2, the embodiment of the invention also discloses a high-temperature semicoke humidifying device, which comprises a fine particle semicoke pulping device 3 and a humidifying agitator 4, wherein the humidifying agitator 4 comprises a tank body, a semicoke inlet 8 to be humidified, a semicoke slag slurry inlet 9 and a humidifying coke slurry outlet 11 which are arranged on the tank body, and a stirring device arranged in the tank body; the fine particle semicoke pulping device 3 comprises a fine particle semicoke inlet 5, a water inlet 6 and a semicoke slurry outlet 7, wherein the semicoke slurry outlet 7 is connected with a semicoke slurry inlet 9 through a slurry pump 10, and a nozzle is arranged at the semicoke slurry inlet 9.
On the basis of the embodiment, the semicoke inlet 8 to be humidified is communicated with a dust collection bin of the primary cyclone dust collector 1; the fine particle semicoke inlet 5 is communicated with a dust collection bin of the secondary cyclone dust collector 2. The lower end of the dust collection bin is provided with an ash discharge valve 14. The humidifying coke slurry outlet 11 is communicated with a humidifying coke slurry storage device through a pipeline, and a slag slurry pump 10 or a humidifying coke slurry pump is arranged on the pipeline.
Specifically, the water coke slurry prepared by the humidifying agitator 4, namely the humidifying coke slurry, can be sent out through the slurry pump 10, namely the slurry pump 10 is arranged on a pipeline, and the water coke slurry water content is preferably designed to be about 50%. The water content of the thin coke slurry, namely semi-coke slag slurry, is about 80-90%, and then the thin coke slurry is pumped into a humidifying mixer 4 through a slag slurry pump 10 to be mixed with high-temperature coke powder, the high-temperature semi-coke inlet of the humidifying mixer 4 is connected with an ash discharge valve 14 of the primary cyclone dust collector 1, and the temperature of the high-temperature semi-coke is about 400-600 ℃.
In summary, the high-temperature semicoke humidifying device and method provided by the invention have the following characteristics:
1. the semi-coke to be humidified is mixed with the thin coke slurry to be humidified and stirred, so that all hot semi-coke is directly mixed with water, the thin coke slurry is used for replacing water, the surface tension is reduced, the affinity with the semi-coke is increased, the semi-coke powder and the water coke slurry are timely mixed, the humidifying and stirring efficiency is improved, and the uniformity and effect of coke powder humidification are ensured.
2. The preparation of the thin coke slurry is to mix semicoke separated by a secondary cyclone dust collector with water, the semicoke temperature is low, and the water consumption is low.
3. Because the surface tension of the thin coke slurry is smaller, the hot semicoke is easier to mix with the slurry, so that the coke powder and the semicoke are timely mixed, the condition that the coke powder floats on the water surface and is difficult to mix is avoided, the direct unordered mixing of the high-temperature semicoke and the water is reduced, the rapid expansion is realized, the potential safety hazard caused by the overpressure of equipment is caused, and the problem that a large amount of steam carries dust to leak is also eliminated.
4. Because the secondary cyclone dust collector has finer dust, the prepared slurry can be atomized and sprayed into the humidifying agitator through the nozzle, thereby preventing the nozzle from being blocked and being beneficial to the atomization of the slurry.
Example 1
The consumption of pyrolysis gas of the pyrolysis furnace system is 100 tons/hour, the raw coal consumption of the pyrolysis furnace is 100 t/hour, and 5 ten thousand Nm of pyrolysis gas is produced 3 And/h, the high-temperature semicoke produced by the pyrolysis furnace is 50t/h, wherein about 10% of high-temperature semicoke powder is discharged out of the pyrolysis furnace along with pyrolysis gas, the amount of the pyrolysis gas carried with the semicoke powder is 5t/h, and the semicoke granularity of more than 90% of pyrolysis gas is less than or equal to 0.5mm.
Wherein the semicoke temperature is about 750 ℃, and specific relevant parameters are shown in table 1.
TABLE 1 high temperature semicoke parameters
The carbocoal particle size composition in the pyrolysis gas is shown in table 2.
TABLE 2 semicoke particle size composition in pyrolysis gas
After the pyrolysis gas passes through the cyclone dust collector, the collected semicoke temperature is about 500 ℃ and the bulk density is 0.45t/m 3 . The total carrying amount is 5t/h. Specifically, pyrolysis gas carrying semi-coke powder firstly enters a primary cyclone dust collector, wherein the primary cyclone dust collection efficiency is about 70-90%, high-temperature semi-coke powder with the speed of about 3.5-4.5 t/h can be discharged from an ash discharge valve under the cyclone dust collector, and enters a humidifying mixer through a semi-coke inlet to be humidified of the humidifying mixer.
Then the pyrolysis gas carries the residual high-temperature coke powder to enter the secondary cyclone dust collector, and the same principle is that about 0.45 to 1.2t/h of high-temperature semi-coke powder is discharged from an ash discharge valve under the secondary cyclone dust collector, and the temperature of the high-temperature semi-coke powder is reduced to about 400 ℃. Semicoke powder discharged by an ash discharge valve of the secondary cyclone dust collector enters a pulping tank or a high-speed pulping machine to prepare slurry, and the moisture content of the semicoke powder is 70-95%. The slurry from the pulping pool or the high-speed pulping machine is pressurized to 0.2-0.5 MPa by a plunger pump (slurry pump), and then enters a nozzle of a humidifying mixer for atomization and enters the humidifying mixer.
And mixing the atomized slurry and the high-temperature semicoke powder in a humidifying mixer, and humidifying and stirring. The water-coke slurry with the water content of 40-50% is prepared and then enters the next working procedure to be used as the fuel of the water-coal slurry boiler and the raw material of the gas making furnace.
The embodiment has the following advantages compared with the direct humidification and stirring by water:
the direct water spraying stirring is carried out, because the tension of the water at the temperature is only about 0.073N/m, and the semi-coke powder contains a small amount of tar components, the affinity of the semi-coke powder and the tar components is relatively poor, and the semi-coke powder is humidified and stirred according to 4.5t/h, the length of a stirring area in a humidifying stirrer is more than or equal to 4m, and a large amount of dust can be generated.
If the water coke slurry containing 5% -10% of coke powder is sprayed, the surface tension is reduced to about 0.04N/m, and the properties of semicoke in the water coke slurry are the same as those of the coke powder, so that the high-temperature coke powder and the water coke slurry are favorably and rapidly fused. Greatly improves the efficiency of the humidifying agitator. The length of the stirring area can be shortened by 50%, more importantly, dust emission is reduced, and the sealing requirement of the system is reduced.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention; modifications and equivalent substitutions are intended to be included in the scope of the claims without departing from the spirit and scope of the present invention.
Claims (10)
1. The high-temperature semicoke humidifying method is characterized by comprising the following steps of:
mixing fine-particle semicoke with water to form semicoke slurry;
and adding semicoke to be humidified into a humidifying mixer, and spraying the semicoke slurry into the humidifying mixer for humidifying and stirring to obtain humidifying coke slurry.
2. The high temperature semicoke humidification method according to claim 1, wherein the fine particle semicoke is more than 90% of fine particle semicoke with a particle size not more than 0.074mm.
3. The high-temperature semicoke humidifying method according to claim 1 or 2, wherein the semicoke to be humidified is semicoke collected by a primary cyclone dust collector, and the fine particle semicoke is semicoke collected by a secondary cyclone dust collector.
4. The high-temperature semicoke humidifying method according to claim 1 or 2, wherein the mass content of fine particle semicoke in the semicoke slurry is 5-30%, and the mass content of water is 70-95%.
5. A high temperature semicoke humidification method as claimed in claim 1 or 3 wherein the humidified coke slurry has a moisture content of 40-50% by mass.
6. The high temperature semicoke humidification method according to claim 3, wherein the fine particle semicoke is 5% -20% of the total mass of semicoke collected by the primary cyclone dust collector and semicoke collected by the secondary cyclone dust collector.
7. A high-temperature semicoke humidifying device is characterized by comprising a fine particle semicoke pulping device and a humidifying stirrer, wherein,
the humidifying stirrer comprises a tank body, a semicoke inlet to be humidified, a semicoke slurry inlet, a humidifying coke slurry outlet and a stirring device, wherein the semicoke inlet, the semicoke slurry inlet and the humidifying coke slurry outlet are arranged on the tank body;
the fine-particle semicoke pulping device comprises a fine-particle semicoke inlet, a water inlet and a semicoke slurry outlet, wherein the semicoke slurry outlet is connected with the semicoke slurry inlet through a slurry pump, and a nozzle is arranged at the semicoke slurry inlet.
8. The high-temperature semicoke humidifying device according to claim 7, wherein the semicoke inlet to be humidified is communicated with a dust collection bin of a primary cyclone dust collector;
the fine particle semicoke inlet is communicated with a dust collection bin of the secondary cyclone dust collector.
9. The high temperature semicoke humidifying device as claimed in claim 8, wherein the dust collection bin is provided with an ash discharge valve at a lower end thereof.
10. The high temperature semicoke humidifying device as claimed in claim 7, wherein the humidified coke slurry outlet is communicated with the humidified coke slurry storage device through a pipeline, and a slurry pump is arranged on the pipeline.
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