CN109609188B - Wet acetylene carbide slag treatment process - Google Patents
Wet acetylene carbide slag treatment process Download PDFInfo
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- CN109609188B CN109609188B CN201811427940.3A CN201811427940A CN109609188B CN 109609188 B CN109609188 B CN 109609188B CN 201811427940 A CN201811427940 A CN 201811427940A CN 109609188 B CN109609188 B CN 109609188B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10H—PRODUCTION OF ACETYLENE BY WET METHODS
- C10H21/00—Details of acetylene generators; Accessory equipment for, or features of, the wet production of acetylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4227—Manipulating filters or filter elements, e.g. handles or extracting tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
Abstract
The invention discloses a wet acetylene carbide slag treatment process, which specifically comprises the following steps: a) recovering acetylene gas in the carbide slag slurry, carrying out primary sedimentation separation on the carbide slag slurry, spraying the carbide slag slurry into a degassing tower through a slurry pump, and simultaneously, exhausting gas from the top of the degassing tower by adopting a vacuum pump to keep the degassing tower at a certain vacuum degree; b) the method comprises the following steps of (1) carrying out filter pressing and drying on carbide slag slurry, carrying out filter pressing on the carbide slag slurry with acetylene gas recovered through a filter pressing system, pre-drying the carbide slag through a dryer, sending the pre-dried carbide slag into a drying tower, fully mixing the carbide slag with high-temperature dry airflow sent by an air blower in the tower under the action of an induced draft fan, carrying out cyclone rising, and discharging particles from the top of the tower along with the airflow; c) and (4) grading the carbide slag, and conveying the dried carbide slag to a solid powder classifier to separate coarse carbide slag from fine carbide slag. The invention mainly aims at the problem of high treatment cost of the acetylene sludge by the wet method, and realizes the recovery of acetylene gas and the comprehensive utilization of the acetylene sludge by adopting a comprehensive treatment and utilization technology of the acetylene sludge.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a wet acetylene carbide slag treatment process.
Background
The dry acetylene process is basically mature, but the defects of the service life of key equipment and the manufacturing process cause a plurality of system operation faults, and the defects are highlighted by certain problems of a crushing system, a charging sealing system, a dust prevention and discharge system. The particle size of the calcium carbide is required to be less than or equal to 3mm in the dry acetylene process, the specified requirement can be met only by three-stage crushing, iron blocks in the calcium carbide are easy to damage equipment such as a hammer head and a rotary screen of a disc crusher, and the long-period continuous stable operation effect of the system is poor. The wet acetylene process is relatively mature, and the production operation is relatively stable. And the acetylene consumption per ton by the wet method is 1.32t calcium carbide, the acetylene consumption per ton by the dry method is 1.34t calcium carbide, the feeding storage hopper of the acetylene calcium carbide by the wet method does not need to be continuously replaced by nitrogen, and the acetylene consumption by the dry method needs to be continuously injected with nitrogen. The dry acetylene calcium carbide needs three-stage crushing, and the power consumption is high, and from the aspect of operation, the material consumption and the energy consumption of the dry acetylene are higher than those of the wet acetylene. Finally, the wet acetylene method is more advantageous than the dry acetylene method, but the carbide slag in the wet acetylene method has the water content of about 40 percent and can be used after being dried, and the carbide slag in the dry acetylene method can be directly used without being dried.
At present, for a wet-process acetylene production device, acetylene gas is generated by hydrolyzing calcium carbide in an acetylene generator, a large amount of heat and carbide slag slurry are generated, the acetylene gas is dissolved in the carbide slag slurry in a supersaturated manner, and the carbide slag slurry has strong acetylene adsorption capacity. At present, in the industry, the carbide slag slurry is generally directly introduced into a slag slurry tank and a concentration tank, most of acetylene gas in the carbide slag slurry is discharged into the atmosphere, the smell is unpleasant, the operation environment is deteriorated, the acetylene gas released by the carbide slag slurry is flammable and explosive, potential safety hazards exist, and meanwhile, certain carbide loss is caused by direct discharge of the part of acetylene gas.
In addition, even if the acetylene gas in the carbide slag slurry is recovered, the water content of the carbide slag after the recovery of the acetylene gas is about 40%, and the carbide slag belongs to industrial waste which is difficult to treat. The traditional process adopts open belt transport to carry filter-pressing carbide slag to a cement plant for producing cement, adopts carbide slag to replace limestone to make cement, but the water content in the carbide slag will lead to the water content increase in the cement raw materials, and the viscosity increases, causes its transport, storage, accurate batching and mechanical dehydration degree of difficulty increase, and it is visible, and the high water content of carbide slag thick liquid directly restricts the proportion that carbide slag replaces the lime stone and the normal operating of whole production process.
Disclosure of Invention
The invention aims to: aiming at the problems, the comprehensive treatment process of the carbide slag applied to the wet acetylene production is provided.
The technical scheme of the invention is realized as follows: the wet acetylene sludge treating process is characterized by comprising the following steps: the method specifically comprises the following steps:
a) recovering acetylene gas in the carbide slag slurry, carrying out primary sedimentation separation on the carbide slag slurry, spraying the carbide slag slurry into a degassing tower through a slurry pump, and simultaneously, exhausting gas from the top of the degassing tower by adopting a vacuum pump to keep the degassing tower at a certain vacuum degree;
b) the carbide slag slurry is subjected to filter pressing and drying, the carbide slag slurry with the acetylene gas recovered is subjected to filter pressing through a filter pressing system, then is conveyed into a drying machine through a conveying mechanism to be heated and subjected to moisture vaporization, the predried carbide slag is conveyed into a drying tower, is fully mixed with high-temperature dry airflow conveyed by an air blower under the action of an induced draft fan in the tower, rises in a rotational flow manner, and particles are discharged from the top of the tower along with the airflow;
c) and (3) grading the carbide slag, conveying the dried carbide slag to a solid powder classifier for separating coarse carbide slag and fine carbide slag, and respectively conveying the separated coarse carbide dry slag and fine carbide dry slag to a downstream process.
In the step a), the carbide slag slurry overflowing from the acetylene generator is sent into a slag slurry buffer tank, after primary sedimentation separation and removal of large impurity solids, the carbide slag slurry is sprayed into a degassing tower at a high speed by a slag slurry pump, under the action of high-speed impact, the coating of tiny carbide particles coated by the carbide slag slurry is opened, and hydrolysis reaction is carried out to generate acetylene gas.
In the step a), acetylene gas from a degassing tower is condensed by a cooler to remove most of water vapor, then the acetylene gas is pressurized and sent to the cooler and a foam catcher to further remove condensed water, the acetylene gas returns to an acetylene gas cabinet, and slag slurry discharged from the bottom of the degassing tower overflows to a slag slurry pool through a slag slurry discharge tank.
In the step a), the pressure of-0.08 to-0.06 MPa is kept in the degassing tower, so that the slurry in the degassing tower is in a boiling state, the acetylene gas adsorbed in the carbide slag slurry is desorbed through negative pressure flash evaporation, and part of unreacted small carbide particles are reacted to release acetylene.
In the wet acetylene sludge treatment process, in the step b), the acetylene sludge slurry recovered from the acetylene gas is subjected to filter pressing and then is sent into a dryer by a feeder through a belt conveyor and a bucket elevator, and an electromagnetic iron remover is arranged on the belt conveyor.
In the step b), the acetylene sludge is heated by a dryer, moisture is vaporized, generated water gas is pumped into a bag-type dust remover from a top exhaust port by a moisture exhaust fan, dust carried by steam is separated and then is exhausted, the separated dry powder is discharged into a feed port of the dryer and is mixed with fresh feed with high moisture content, the pre-dried acetylene sludge is sent into a drying tower by a double-screw conveyor at the bottom of a discharge end of the dryer for further drying, the dried acetylene sludge discharged from the top of the drying tower passes through a cyclone separator and a bag-type dust remover two-stage separation recovery device, the qualified acetylene sludge after drying is recovered to a finished product bin, the material with larger particles falls back to the bottom of the drying tower and is ground into fine powder by a crusher at the bottom, and the fine powder continuously rises along with air flow.
In the step b), the operation temperature in the dryer is 130-140 ℃, the water content of the carbide slag discharged from the dryer is below 8%, the carbide slag is fully mixed with 100-150 ℃ high-temperature airflow discharged by an air blower in a drying tower, carbide slag particles with the particle size of less than 50 mu m are recycled to a finished product bin through a cyclone separator and a bag-type dust collector, and the dry water content of the dried carbide is less than 1%.
The invention relates to a wet acetylene sludge treatment process, which comprises the following steps that in the step c), dried acetylene sludge is conveyed to an air pipe by a screw conveyor and conveyed to a solid powder classifier by an air blower, materials enter from the bottom of the solid powder classifier and are guided to a collision bucket by a pyramid in the classifier, part of coarse calcium carbide falls down after collision and is discharged from a slag discharge port at the bottom of the classifier, the rest materials continue to move upwards under the drive of air flow, when encountering guide vanes uniformly distributed around the circumference at the top of the classifier, coarse acetylene sludge particles are collided again and fall into a lower cylinder, when the particles are accumulated to a certain weight in the cylinder, the gravity of the acetylene sludge pushes a plurality of ash gates uniformly distributed at the bottom of the cylinder, the accumulated acetylene sludge particles slide downwards from the ash gates to the slag discharge port at the bottom of the classifier, and after the materials are discharged, the ash gates are quickly closed again, and the complete air cut-off is realized, the coarse carbide slag separated at the lower part of the classifier falls to a coarse slag hopper, the coarse carbide slag is conveyed to a coarse carbide slag bin by a screw conveyor through a bucket elevator, and fine carbide slag particles are discharged from an air outlet at the top of the classifier.
The invention relates to a wet acetylene sludge treatment process, which comprises the steps of discharging fine acetylene sludge particles discharged from an air outlet at the top of a solid powder classifier into a fine acetylene sludge bin through a downstream cyclone separator, conveying the fine acetylene sludge particles to a brick making machine through a star-shaped feeder, discharging gas from the top of the cyclone separator, mixing the gas with dry acetylene sludge conveyed by a blower, and returning the mixed gas to the classifier again.
According to the wet acetylene carbide slag treatment process, air is used as a conveying medium for dried and classified carbide slag, the carbide slag is fed from a buffer bin to a sending tank through a closed pneumatic conveying system, and the carbide slag is sent to downstream users through the sending tank, a control valve and a pipeline.
The invention mainly aims at the problem of high treatment cost of wet acetylene carbide slag, adopts a comprehensive acetylene slag treatment and utilization technology, and particularly relates to a novel process for recovering acetylene gas and comprehensively utilizing acetylene slag by recovering the acetylene gas in the acetylene slag, performing filter pressing and drying, sorting the dry calcium carbide slag by using a classifier, and conveying the dry calcium carbide slag with different particle sizes to a downstream user by using a closed pneumatic conveying system.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
FIG. 2 is a schematic view showing the structure of a solid powder classifier according to the present invention.
The labels in the figure are: 1 is the casing, 2 is the pyramid, 3 is collision fill, 4 is the material entry, 5 is the material export, 6 is the top cap, 7 is guide vane, 8 is the barrel, 9 is the lime-ash door, 10 is the row cinder notch.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a wet acetylene sludge treatment process for treating acetylene sludge by a multi-step method to realize the recycling of acetylene gas and the safe conveying and graded utilization of acetylene sludge specifically comprises the following steps:
a) recovery of acetylene gas in carbide slag slurry: the method comprises the steps of conveying carbide slag slurry with the temperature of 85 ℃ overflowing from an acetylene generator into a slag slurry buffer tank through an overflow pipe, carrying out primary sedimentation separation, removing large impurity solids, then spraying the carbide slag slurry into a degassing tower at a high speed through a slag slurry pump, opening a coating of small carbide particles coated by the carbide slag slurry under the action of high-speed impact, carrying out hydrolysis reaction to generate acetylene gas, simultaneously exhausting air from the top of the degassing tower through a vacuum pump to keep a certain vacuum degree of the degassing tower, keeping the pressure of-0.08 to-0.06 MPa in the degassing tower to keep the slurry in the degassing tower in a boiling state, and carrying out negative pressure flash evaporation to desorb the acetylene gas adsorbed in the carbide slag slurry and also react and release acetylene through partial unreacted small carbide particles. Acetylene gas from the degassing tower is condensed by a cooler to remove most of water vapor, then the acetylene gas is pressurized and sent into the cooler and a foam catcher to further remove condensed water, the acetylene gas returns to an acetylene gas cabinet, and slag slurry discharged from the bottom of the degassing tower overflows to a slag slurry pool through a slag slurry discharge tank. According to Henry's law, the solubility of acetylene gas in the slurry increases with the decrease of temperature, and when the temperature is lower, the acetylene gas is not easy to be removed in the desorption tower. Therefore, the heat-insulating layers are added on the feeding pipeline and the slurry buffer tank, the acetylene gas removal efficiency of the degassing tower is improved, and the recovery rate of the acetylene gas is improved.
Wherein the temperature of the slurry buffer tank is more than or equal to 72 ℃, the volume fraction of the recovered acetylene gas is more than or equal to 92%, the oxygen content in the recovered acetylene gas is less than or equal to 1%, and the recovery rate of the acetylene gas is more than or equal to 95%. The on-line oxygen detector is arranged on the acetylene pipeline, the content of oxygen in acetylene gas is detected on line, when the content of oxygen in acetylene gas exceeds standard (more than 1%), the device automatically stops in an interlocking manner, and the interlocking stop of the device cannot influence the production stability of other devices.
The invention aims at saving energy, reducing consumption and developing circular economy, adopts the technology of recycling acetylene gas from the carbide slag slurry, effectively recycles the acetylene gas from the carbide slag slurry, solves the problem of loss of dissolved acetylene, reduces the consumption of carbide and water, saves the production cost and reduces the environmental pollution.
b) Filter pressing and drying of the carbide slag slurry: retrieve carbide slag slurry of acetylene gas and send into the desiccator through band conveyer and bucket elevator by the feeder after the filter-pressing, in order to prevent to sneak into the scrap iron piece in the material and damage equipment, be provided with the electromagnetism de-ironing separator on band conveyer, the feeder export sets up carries reinforced and crushing function, prevents that the carbide slag from bonding epaxial, blocks up the feed opening.
Carbide slag is heated by a drier firstly, moisture is vaporized, generated water gas is pumped into a bag-type dust remover from a top exhaust port by a moisture exhaust fan, dust carried by steam is separated and then is exhausted, separated dry powder is discharged into a feed port of the drier and is mixed with fresh feed with higher water content, the hardening and axle-holding phenomena of materials can be reduced, pre-dried carbide slag is sent into a drying tower for further drying by a double-screw conveyer at the bottom of a discharge end of the drier, the dried carbide slag discharged from the top of the drying tower passes through a cyclone separator and a two-stage separation and recovery device of the bag-type dust remover, the qualified carbide slag after drying is recovered to a finished product bin, the material with larger particles falls back to the bottom of the drying tower and is ground into fine powder by a crusher at the bottom, the fine powder continuously rises along with air flow, and in order to prevent steam condensation, a moisture removal pipeline and the bag-.
The operation temperature in the dryer is 130-140 ℃, the moisture of the materials contacting with the blades, the shaft and the inner wall of the equipment is quickly vaporized, the water content of the carbide slag discharged from the dryer is below 8%, the carbide slag is fully mixed with 100-150 ℃ high-temperature airflow discharged by an air blower in a drying tower, carbide slag particles with the particle size of less than 50 mu m are recycled to a finished product bin through a cyclone separator and a bag-type dust collector, the drying process time of the carbide slag is about 24min, and the dried water content of the carbide after drying is lower than 1%.
The invention adopts the carbide slag drying process to avoid the environmental pollution and explosion hazard caused by the traditional open transportation of the carbide slag, and the dried carbide slag can be used as a desulfurizer for producing cement and NID semi-dry desulfurization technology, and the like. Meanwhile, if the carbide slag is adopted to produce cement, the procedure of predrying, drying and dehydrating the carbide slag of a cement device is also omitted, and the heat consumption of the cement device is reduced.
c) Grading the carbide slag: the dried carbide slag is sent to an air pipe by a screw conveyer and sent to a solid powder classifier by an air blower. As shown in fig. 2, the solid powder classifier comprises a shell 1, and a pyramid 2 and a collision bucket 3 which are arranged in the shell 1, the solid powder classifier adopts a mode of feeding in and discharging out from the bottom, a material inlet 4 and a slag discharge port 10 are arranged at the lower end of the classifier, a material outlet 5 is arranged at the upper part of the classifier, the pyramid 2 is arranged above the material inlet 4, the collision bucket 3 is arranged above the pyramid 2, annular material ascending channels are formed between the pyramid 2 and the inner wall of the shell 1 and between the collision bucket 3 and the inner wall of the shell 1, a top cover 6 is arranged at the top of the shell 1, a plurality of guide vanes 7 which are uniformly distributed around the circumference and take the axial center of the collision bucket as the center are arranged between the upper end opening of the collision bucket 3 and the top cover 6, a cylinder 8 is arranged at the bottom of the collision bucket 3, the cylinder 8 is matched with the outer surface of the pyramid 2 to form a space for collecting coarse carbide slag, and a plurality of ash gates 9 are arranged on the side surface of the cylinder body 8, and after the ash gates are opened, the space at the bottom of the cylinder body for collecting the thicker carbide slag is communicated with the material ascending channel.
The method comprises the steps that materials enter from the bottom of a solid powder classifier, the discharge pressure of an air blower is 10-20 KpaG, carbide slag is guided to a collision bucket through a pyramid in the classifier, coarse carbide partially falls after collision and is discharged from a slag discharge port in the bottom of the classifier, the rest materials continue to move upwards under the drive of air flow, when the materials meet guide vanes which are uniformly distributed around the circumference at the top of the classifier, coarse carbide slag particles are collided again and fall into a lower cylinder, when the particles are accumulated to a certain weight in the cylinder, the gravity of the carbide slag instantly pushes a plurality of ash gates uniformly distributed at the bottom of the cylinder open, the accumulated carbide slag particles slide downwards from the ash gates to the slag discharge port in the bottom of the classifier, after the materials are discharged, the ash gates are quickly closed again to realize full air sealing, the coarse carbide slag separated at the lower part of the classifier falls to the coarse carbide slag bucket, and is conveyed to a coarse carbide slag bin by a screw conveyor through a bucket elevator, and the fine carbide slag particles are discharged from an air outlet at the top of the classifier, discharged into a fine carbide slag bin through a downstream cyclone separator, sent to a brick making machine through a star-shaped feeder, discharged from the top of the cyclone separator, mixed with the dry carbide slag sent by the blower and then returned to the classifier again. Wherein, the cylinder height of the classifier is 1400mm, the diameter of the upper part is 1630mm, and the diameter of the lower part is 700 mm.
The classifier is mainly characterized in that only materials are winnowed without air conveying, and compared with other types of classifiers, the classifier can reduce the breaking of dry carbide slag in the separation process to the maximum extent due to the fact that the air speed is reduced and long-distance conveying is not carried out. Meanwhile, the carbide slag discharged from the ash residue door at the bottom of the classifier cylinder body is mixed with newly fed carbide slag, and part of fine particles separated by air are blown upwards again along with new materials, so that secondary air separation is realized, and the fine carbide slag is further separated. Under the combined action of two times of air separation, the separation precision and the separation effect of the carbide slag are greatly improved, and meanwhile, the granularity of the separated carbide slag can be adjusted according to the needs of users by adjusting the air speed.
According to different purposes, the dried carbide slag can be classified by a classifier with a special structure according to different purposes by utilizing the mass density difference principle, and the separation of the coarse carbide slag and the fine carbide slag is realized by adjusting the wind speed.
Finally, the dried and classified carbide slag adopts air as a conveying medium, is fed from the buffer bin to the sending tank through the closed pneumatic conveying system, and is sent to downstream users through the sending tank, the control valve and the pipeline. The pneumatic conveying mode is positive pressure dense-phase conveying, and the conveying pressure is 0.28-0.3 MpaG. Compared with an FU chain conveyor, the process effectively solves the problems of short conveying distance and small conveying capacity, simultaneously adopts air conveying, realizes fully-automatically controlled closed conveying in the process, has no dust pollution, has the obvious advantages of small occupied area, clean operating environment, environmental protection, safety, economic operation and the like, and solves the problems of sticking and blocking of carbide slag during conveying of a belt conveyor, deviation and abrasion of an adhesive tape and material leakage in the conveying process. Meanwhile, the acetylene gas in the carbide slag is recovered, and the carbide dry slag can be conveyed without adopting nitrogen as a medium, so that a nitrogen circulating compressor is omitted, the electricity consumption, the nitrogen consumption and the operation cost are greatly reduced, and the danger of explosion when the acetylene gas meets air in the carbide slag conveying process is fundamentally solved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The wet acetylene sludge treating process is characterized by comprising the following steps: the method specifically comprises the following steps:
a) recovering acetylene gas in the carbide slag slurry, carrying out primary sedimentation separation on the carbide slag slurry, spraying the carbide slag slurry into a degassing tower through a slurry pump, and simultaneously, exhausting gas from the top of the degassing tower by adopting a vacuum pump to keep the degassing tower at a certain vacuum degree;
b) the carbide slag slurry is subjected to filter pressing and drying, the carbide slag slurry with the acetylene gas recovered is subjected to filter pressing through a filter pressing system, then is conveyed into a drying machine through a conveying mechanism to be heated and subjected to moisture vaporization, the predried carbide slag is conveyed into a drying tower, is fully mixed with high-temperature dry airflow conveyed by an air blower under the action of an induced draft fan in the tower, rises in a rotational flow manner, and particles are discharged from the top of the tower along with the airflow;
c) classifying the carbide slag, wherein the dried carbide slag enters from the bottom of a solid powder classifier, is guided to a collision bucket through a pyramid body in the classifier, part of the coarse carbide slag falls after collision and is discharged from a slag discharge port at the bottom of the classifier, the rest materials are driven by airflow to continuously go upwards, when the coarse carbide slag particles meet guide vanes which are uniformly distributed around the circumference at the top of the classifier, the coarse carbide slag particles are collided again and fall into a lower cylinder, when the particles are accumulated to a certain weight in the cylinder, the gravity of the carbide slag instantly pushes a plurality of ash gates uniformly distributed at the bottom of the cylinder open, the accumulated carbide slag particles slide downwards from the ash gates to the slag discharge port at the bottom of the classifier, after the materials are discharged, the ash gates are quickly closed again to realize complete air shut-off, the coarse carbide slag separated at the lower part of the classifier falls into the coarse carbide hopper, the carbide slag is sent out of an exhaust cabin, and the fine carbide slag particles are discharged from a top port of the classifier, and respectively sending the separated coarse calcium carbide dry slag and the separated fine calcium carbide dry slag to downstream processes.
2. The wet acetylene sludge treatment process according to claim 1, characterized in that: in the step a), the carbide slag slurry overflowing from the acetylene generator is sent into a slag slurry buffer tank, after primary sedimentation separation and removal of large impurity solids, the carbide slag slurry is sprayed into a degassing tower at a high speed by a slag slurry pump, under the action of high-speed impact, the coating of the small carbide particles coated by the carbide slag slurry is opened, and a hydrolysis reaction is carried out to generate acetylene gas.
3. The wet acetylene sludge treatment process according to claim 1, characterized in that: in the step a), acetylene gas from the degassing tower is condensed by a cooler to remove most of water vapor, then the acetylene gas is pressurized and sent to the cooler and a foam catcher to further remove condensed water, the acetylene gas returns to an acetylene gas cabinet, and slag slurry discharged from the bottom of the degassing tower overflows to a slag slurry pool through a slag slurry discharge tank.
4. The wet acetylene sludge treatment process according to claim 1, characterized in that: in the step a), the pressure of-0.08 to-0.06 MPa is kept in the degassing tower, so that the slurry in the degassing tower is in a boiling state, acetylene gas adsorbed in the carbide slag slurry is desorbed through negative pressure flash evaporation, and part of unreacted carbide small particles are reacted to release acetylene.
5. The wet acetylene sludge treatment process according to claim 1, characterized in that: in the step b), the carbide slag slurry of the recovered acetylene gas is subjected to filter pressing and then is sent into a dryer by a feeder through a belt conveyor and a bucket elevator, and an electromagnetic iron remover is arranged on the belt conveyor.
6. The wet acetylene sludge treatment process according to claim 1, characterized in that: in the step b), the carbide slag is heated by a drier, moisture is vaporized, generated water gas is pumped into a bag-type dust remover from a top exhaust port by a moisture exhaust fan, dust carried by steam is separated and then is exhausted, separated dry powder is discharged into a feed port of the drier and is mixed with fresh feed with high moisture content, pre-dried carbide slag is sent into a drying tower for further drying by a double-screw conveyor at the bottom of a discharge end of the drier, the dried carbide slag discharged from the top of the drying tower is recycled to a finished product bin by a cyclone separator and a two-stage separation and recovery device of the bag-type dust remover, the material with large particles falls back to the bottom of the drying tower and is ground into fine powder by a crusher at the bottom, and the fine powder continuously rises along with air flow.
7. The wet acetylene sludge treatment process according to claim 1, characterized in that: in the step b), the operation temperature in the dryer is 130-140 ℃, the water content of the carbide slag discharged from the dryer is below 8%, the carbide slag is fully mixed with 100-150 ℃ high-temperature airflow discharged by an air blower in a drying tower, carbide slag particles with the particle size of less than 50 mu m are recycled to a finished product bin through a cyclone separator and a bag-type dust collector, and the dry water content of the dried carbide is less than 1%.
8. The wet acetylene sludge treatment process according to claim 1, characterized in that: and fine carbide slag particles discharged from an air outlet at the top of the solid powder classifier are discharged into a fine carbide slag bin through a downstream cyclone separator, then are conveyed to a brick making machine through a star-shaped feeder, and gas is discharged from the top of the cyclone separator, is mixed with dry carbide slag conveyed by an air blower and then returns to the classifier again.
9. The wet acetylene sludge treatment process according to claim 1, characterized in that: the dried and classified carbide slag adopts air as a conveying medium, is fed to a sending tank from a buffer bin through a closed pneumatic conveying system, and is sent to downstream users through the sending tank, a control valve and a pipeline.
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