CN110935718B - Industrial salt slag pretreatment system and pretreatment method thereof - Google Patents
Industrial salt slag pretreatment system and pretreatment method thereof Download PDFInfo
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- CN110935718B CN110935718B CN201911311622.5A CN201911311622A CN110935718B CN 110935718 B CN110935718 B CN 110935718B CN 201911311622 A CN201911311622 A CN 201911311622A CN 110935718 B CN110935718 B CN 110935718B
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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
- 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
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention discloses an industrial salt residue pretreatment system and a pretreatment method thereof, and the system comprises a crusher and a pulping tank, wherein salt residue particles crushed by the crusher fall into the pulping tank with a stirring function, the outer wall of the pulping tank is connected with an organic matter adjusting system to remove organic matters floating up in the pulp in the pulping tank, a pulp outlet of the pulping tank is connected with a centrifuge through a conveying pipeline, and a salt slurry conveying pump is arranged on the conveying pipeline and used for conveying salt slurry; the discharge port of the centrifuge is communicated with the feed port of the dryer, the discharge port of the dryer conveys dried salt slag particles into the bag-type dust collector and the transition bin through air flow, and the discharge end of the transition bin outputs the salt slag particles into the pyrolysis tower. The method carries out pretreatment through the steps of salt slag crushing, salt slag pulping, homogenization, salt slurry storage, salt slag dehydration, salt slag drying and the like, finally restores the salt slag to the original crystalline state after entering the pyrolysis tower, and has the advantages of stable temperature of the pyrolysis system, high removal rate of organic matters in the salt slag, renewable and cyclic utilization of products and environmental protection.
Description
The technical field is as follows:
the invention relates to the technical field of resource utilization of industrial salt slag, in particular to an industrial salt slag pretreatment system and a pretreatment method thereof.
Background art:
the industrial salt slag mainly comes from a plurality of industrial industries such as pesticide, pharmacy, fine chemical industry (intermediate), coal chemical industry, printing and dyeing and the like, mainly is high-salt-content wastewater generated in the working sections of chemical reaction, salting out, color fixing treatment, other chemical reactions and the like under the acid and alkali conditions, and is treated by an evaporative crystallization process to obtain NaCl and Na2SO4And mixtures of one or more inorganic salts and organic pollutants, and other salts and mechanical impurities, which belong to hazardous wastes.
The national industrial production generates a large amount of byproduct salt residues every year, and 20 ten thousand tons of coal chemical industry salt residues, 273 ten thousand tons of pesticide salt residues, 40 ten thousand tons of dye auxiliary agent salt residues, 40 ten thousand tons of epoxy resin salt residues, 30 ten thousand tons of rubber auxiliary agent salt residues and 50 ten thousand tons of polycarbonate salt residues are generated in 2017 in China.
Because the existing hazardous waste disposal units can not effectively remove organic matters in the salt slag, the salt slag is made into finished industrial salt which is used as a raw material of an enterprise, so that the salt slag generated by the enterprise can only be stored in a hazardous waste temporary storage according to the requirement of hazardous waste management or is sent to a landfill for landfill, the resource is greatly wasted, and the environment is influenced. Therefore, the industrial salt slag is subjected to resource treatment, and the method has great social benefit and good economic benefit.
The industrial salt slag disposal methods currently only comprise an incineration method, a landfill method and a high-temperature pyrolysis method. The burning method comprises the following steps: can remove the organic matter with high efficiency, nevertheless can cause the inorganic salt melting to produce the caking and block up the problem because of high temperature burns, lead to high temperature refractory material to corrode and the unable normal use of equipment, burn enterprise unwilling to accept. A landfill method: occupies a large amount of land, has environmental risks and is unwilling to be accepted by a landfill site. High-temperature pyrolysis method: can process single salt or mixed salt, can be recycled, and the tail gas needs high-temperature incineration and purification treatment. The current technology can cause the problems of softening of the salt surface and ring formation and caking of the salt. The burning method and the high-temperature pyrolysis method can remove most of organic matters in the salt slag, but the content of the organic matters in the salt is still high, and the requirements of the soda ash and chlor-alkali industry on the raw material salt cannot be met.
Therefore, if the salt slag pretreatment system and the pretreatment method need to be designed, the salt slag in the pyrolysis tower contains stable organic matter content, the temperature of the pyrolysis system is stable, the supply of heat energy to the pyrolysis tower from the outside is reduced, the removal rate of the organic matter in the salt slag is high, and the purpose of recycling is achieved.
The invention content is as follows:
in order to make up the defects of the prior art, the invention aims to provide an industrial salt slag pretreatment system and a pretreatment method thereof, the structural design and the process are novel and reasonable, the particle size of the salt slag is broken by a crusher, a stirrer and a slurry pump to restore to the original crystallization state, organic matters are effectively prevented from being wrapped by the salt grains and cannot be removed, the content of the organic matters in the salt slag is flexibly adjusted and controlled according to the condition requirements of the temperature, the pressure and the like of a pyrolysis system, so that the temperature of the pyrolysis system is stable, the fluctuation of the pyrolysis temperature of the salt slag is avoided, and the safe and stable operation cannot be realized; the pyrolysis temperature of the salt slag is high, the removal rate of organic matters in the salt slag is high, the renewable cyclic utilization is achieved, and the environment is protected.
The technical scheme of the invention is as follows:
industrial salt sediment pretreatment systems, its characterized in that: comprises a crusher and a pulping tank, wherein the salt residue particles crushed by the crusher are sent into the pulping tank with a stirring function;
the pulping tank is connected with an organic matter adjusting system for adjusting the content of organic matters in the pulp in the pulping tank, the pulp outlet of the pulping tank is connected with a centrifugal machine through a conveying pipeline, and a salt pulp conveying pump is mounted on the conveying pipeline and used for conveying salt pulp;
the discharge port of the centrifuge is communicated with the feed port of the dryer, centrifugal liquid of the centrifuge is conveyed into the pulping tank through a pipeline to be used for pulping, salt slag particles after being conveyed and dried by air flow at the discharge port of the dryer enter the bag-type dust collector and the transition bin, and the salt slag particles are output at the discharge end of the transition bin and enter the pyrolysis tower.
The industrial salt slag pretreatment system is characterized in that: and the conveyor is arranged at the discharge port of the crusher and the feed inlet of the pulping tank, and is used for conveying the crushed salt slag particles into the pulping tank.
The industrial salt slag pretreatment system is characterized in that: and a filter is also arranged on a conveying pipeline between the slurry outlet of the pulping tank and the salt slurry conveying pump, and the filter filters salt slag particles with the particle size of more than or equal to 8mm and other impurities.
The industrial salt slag pretreatment system is characterized in that: and a circulating pipeline is further installed at the outlet of the salt slurry conveying pump, and the circulating pipeline circularly conveys the salt slag slurry with unqualified particle size into the pulping tank.
The industrial salt slag pretreatment system is characterized in that: the salt slurry conveying pump adopts a slurry pump.
The industrial salt slag pretreatment system is characterized in that: the organic matter adjusting system is communicated with the pulping tank and comprises an organic matter separating device and an organic matter supplying device, the organic matter separating device adopts a membrane method or a distillation method separating device, and foam containing organic matters on the upper layer is sent into the organic matter separating device by a suction method when the pulping tank is used for pulping;
the organic matter replenishing device respectively stores the brine or condensate and the organic liquid with high organic matter content generated by the organic matter separating device, and finally controls the content of the organic matter in the salt residue entering the pyrolysis tower to replenish the brine or condensate and the organic liquid according to the organic matter content of the industrial salt residue and the control requirement of the high-temperature pyrolysis temperature.
The industrial salt slag pretreatment system is characterized in that: the salt slurry storage tank with the stirring function is installed on a conveying pipeline between the pulping tank and the centrifugal machine, salt slurry conveying pumps are installed on pipelines on the two sides of the feeding end and the discharging end of the salt slurry storage tank respectively, the salt slurry conveying pump at the feeding end adopts a slurry pump to convey salt slurry for the salt slurry storage tank, and the salt slurry conveying pump at the discharging end adopts a centrifugal pump to convey salt slurry for the centrifugal machine.
The industrial salt slag pretreatment system is characterized in that: the bag-type dust collector and the transition bin are of an integral structure.
The industrial salt slag pretreatment system is characterized in that: the dryer adopts a high-temperature fast fluidized bed.
The method for pretreating the industrial salt slag by using the pretreatment system is characterized by comprising the following steps of:
1) crushing salt slag: the salt slag is sent into a crusher to be crushed, so that the particle size of salt slag particles is less than or equal to 12 mm;
2) salt residue pulping: after the system is debugged, adding a centrifugate generated by a centrifugal machine, a saline water or condensate generated by an organic matter adjusting system and an organic liquid into a pulping tank according to the organic matter content in the salt slag and the temperature control requirement of a high-temperature pyrolyzer in proportion, adding crushed salt slag particles while stirring, and controlling the solid-liquid mass ratio to be 1.2-2;
3) adjusting the content of organic matters in the salt slurry: in the pulping process in the step 2), according to the organic matter content in the salt residue and the temperature control requirement of the high-temperature pyrolyzer, separating partial centrifugate and organic matters in organic foam by using a membrane method or a distillation method through an organic matter adjusting system to obtain condensate or brine with the organic matter content of 5-25% and organic liquid with the organic matter content of 40-60%, adjusting the mass fraction of the organic matters in the salt slurry by adding the condensate with the organic matter content of 5-25% and the organic liquid with the organic matter content of 40-60%, and finally controlling the content of the organic matters in the salt residue entering the high-temperature pyrolyzer;
4) homogenizing salt slurry: starting a salt slurry conveying pump while working in the steps 2) and 3), and finally crushing salt slag particles into a crystalline state by using the impact of salt slag and an impeller, wherein the particle size is controlled to be less than or equal to 220 micrometers; the particle size does not meet the requirement, and the salt slurry is conveyed to the pulping tank by the circulating pipeline to circulate for one or more times;
5) and centrifugal dehydration: directly conveying the prepared salt slurry to a centrifugal machine through a salt slurry conveying pump for dewatering; or conveying the salt slurry to a storage tank with a stirring function through a conveying pump for storage, and conveying the salt slurry to a centrifugal machine through a salt slurry conveying pump for dehydration, wherein the water content in the dehydrated salt slag crystalline particles is 3-6%;
6) drying the salt slag: the dryer adopts a fast fluidized bed, and the drying temperature is as follows: fully contacting the hot gas with the salt slag at 70-120 ℃, stirring the salt slag, and drying the salt slag crystalline particles by utilizing the difference of water partial pressure between the salt slag and the gas;
7) gas-solid separation of the bag-type dust collector: step 6), after drying, sending the dried salt slag into a bag-type dust collector and a transition bin through air flow, carrying out gas-solid separation in the bag-type dust collector, enabling the gas to enter a subsequent tail gas treatment system, enabling the salt slag crystalline particles to fall into the transition bin, and enabling the content of organic matters in the salt slag crystalline particles to be 1.0-2.5%;
8) and high-temperature pyrolysis: and 7) performing high-temperature pyrolysis on the salt slag in a pyrolysis tower to completely remove organic matters in the salt slag crystalline particles.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has novel structural design, the particle size of the salt slag is recovered to the original crystallization state through triple crushing of the crusher, the stirrer and the slurry pump, and the organic matters are effectively prevented from being wrapped by the salt grains and can not be removed;
2. according to the invention, the content of organic matters in the salt slag is flexibly adjusted and controlled according to the condition requirements of the pyrolysis system such as temperature, pressure and the like, so that the temperature of the pyrolysis system is stable, the fluctuation of the pyrolysis temperature of the salt slag is avoided, and the problems of salt slag melting agglomeration, over-temperature and over-pressure of the system and safety accidents are avoided;
3. the salt slag entering the pyrolysis tower has stable organic matter content, can realize and maintain the pyrolysis of the organic matter in a higher temperature environment, ensures that the temperature of a pyrolysis system is stable, has high organic matter removal rate in the salt slag, and can be regenerated and recycled;
4. the content of organic matters in the salt slag entering the pyrolysis tower is stable, so that the temperature of a pyrolysis system is stable, the pyrolysis temperature fluctuation of the salt slag is avoided, the heat energy supplied to the pyrolysis tower from the outside is effectively reduced, and the cost is reduced;
5. the invention is suitable for the pretreatment before the pyrolysis of the salt slag with different organic matter contents (the melting point of the salt slag is more than 300 ℃, and the melting point of pure salt is more than 600 ℃), and has wide application range and low cost.
6. The invention has reasonable process, lays a foundation for the high-temperature pyrolysis efficiency in the pretreatment process, further enables the process parameters of the high-temperature pyrolysis system such as feeding, discharging, pyrolysis temperature, pyrolysis pressure, retention time and the like to be adjustable and controllable, and realizes automatic operation.
7. According to the invention, through a pretreatment system and a pretreatment process, after industrial salt slag is pyrolyzed, various indexes meet the national standard, and the industrial salt slag can be used as a production raw material in the soda ash and chlor-alkali industries, is green and environment-friendly, and realizes regeneration and recycling.
Description of the drawings:
fig. 1 is a schematic block diagram of the present invention.
FIG. 2 is a schematic view of a single slurrying tank and a circulation line according to the present invention.
FIG. 3 is a schematic view of the structure of the present invention with additional salt slurry storage tanks and circulation pipes.
FIG. 4 is a schematic structural diagram of the present invention having multiple pulping tanks and multiple salt slurry storage tanks.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The industrial salt slag pretreatment system comprises a crusher 1 and a pulping tank 2, wherein salt slag particles crushed by the crusher 1 are sent into the pulping tank 2 with a stirring function;
an organic matter adjusting system 3 is connected to the pulping tank 2 to adjust the content of organic matters in the pulping tank 2, a pulp outlet of the pulping tank 2 is connected with a centrifuge 4 through a conveying pipeline, a salt slurry conveying pump 5 is mounted on the conveying pipeline and used for conveying salt slurry, salt slag particles are crushed by a crusher and then conveyed by the salt slag conveying pump, the salt slag particles collide with an impeller in the conveying process and are crushed again, and the granularity of the salt slag is further refined;
the discharge port of the centrifuge 4 is communicated with the feed port of the dryer 6, the centrifugate of the centrifuge 4 is conveyed to the pulping tank 2 through a pipeline to be used for pulping, the discharge port of the dryer 6 is used for conveying dried salt slag particles into the bag-type dust remover and the transition bin 7 through air flow, and the discharge end of the transition bin 7 outputs the salt slag particles into the pyrolysis tower 8.
A conveyor 9 is arranged at a discharge port of the crusher 1 and a feed inlet of the pulping tank 2, the conveyor 9 conveys the crushed salt slag particles into the pulping tank 2, and a stirrer is arranged on a top cover of the pulping tank 2 to form the pulping tank with a stirring function.
A filter 10 is also arranged on a conveying pipeline between the slurry outlet of the pulping tank 2 and the salt slurry conveying pump 5, and the filter 10 filters salt slag particles with the particle size of more than or equal to 8mm and other impurities; whether the filter 10 is added or not is selected according to the actual salt slag condition, if the powder particle size of the system to be pyrolyzed meets the requirement, the particle size does not need to be increased, and otherwise, the particle size is increased.
The salt slurry conveying pump 5 is provided with a circulating pipeline 12 at the outlet, the circulating pipeline 12 circularly conveys salt slurry with unqualified particle size into the pulping tank 2, the salt slurry conveying pump 5 adopts a slurry pump, the salt slurry particle size is recovered to the original crystallization state through the triple crushing of the crusher 1, the stirrer 2 and the salt slurry conveying pump (slurry pump), and the salt slurry can be circulated once or for many times if the salt slurry conveying pump is unqualified, so that organic matters are effectively prevented from being wrapped by salt particles and cannot be removed.
The organic matter adjusting system 3 is communicated with the pulping tank 2, the organic matter adjusting system 3 comprises an organic matter removing and separating device 3-1 and an organic matter supplying device 3-2, the organic matter removing device 3-1 adopts a membrane method or distillation method separating device, and when the pulping tank 2 is used for pulping, the upper layer of foam containing organic matters is extracted and separated to generate brine or condensate with low organic matter content and organic liquid with high organic matter content.
The organic matter supply device 3-2 respectively stores the brine or the condensate with low organic matter content and the organic liquid with high organic matter content generated by the organic matter removal device, and supplies the condensate with low brine or organic matter content (5-25%) and the organic liquid with high organic matter content (40-60%) according to the requirement, and the supply principle is as follows: generally, after the salt slag crystalline particles are dried in a dryer, the content of organic matters in the salt slag crystalline particles is generally required to be 1.0-2.5%, and the content of organic matters in the industrial salt slag is required to be 0.5-10%, so that the mass fraction of the organic matters in the salt slurry needs to be adjusted, and the content of the organic matters in the salt slag entering the high-temperature pyrolyzer is finally controlled.
Install salt thick liquid storage tank 11 that has stirring function on the pipeline between pulping tank and the centrifuge, install salt thick liquid delivery pump 5 on the pipeline of salt thick liquid storage tank 11 feed end and discharge end both sides respectively, the salt thick liquid delivery pump of feed end adopts sediment stuff pump 5-1 to carry the salt thick liquid for the salt thick liquid storage tank, the salt thick liquid delivery pump of discharge end adopts centrifugal pump 5-2 to carry the salt thick liquid for centrifuge, and the centrifugate that produces can be deposited in centrifugate storage tank 13 and continue the slurrying, the cyclic utilization of being convenient for.
The bag-type dust collector and the transition bin 7 are of an integrated structure, and the dryer adopts a high-temperature fast fluidized bed. The hot gas fully contacts with the salt slag and stirs the salt slag, the salt slag is dried and enters a bag-type dust collector together for gas-solid separation by utilizing the difference of water partial pressure between the salt slag and the gas, the gas enters a tail gas treatment system, and the salt slag enters a high-temperature pyrolysis system; the dry gas heat source mainly adopts gas and steam at about 450 ℃ from a high-temperature pyrolysis system or electric energy.
A method for carrying out pretreatment by using an industrial salt slag pretreatment system comprises the following steps:
1) crushing salt slag: the salt slag is sent into a crusher to be crushed, so that the particle size of salt slag particles is less than or equal to 12 mm;
2) salt residue pulping: after the system is debugged, adding a centrifugate generated by a centrifugal machine, a salt water or condensate generated by an organic matter regulating system and an organic liquid into a pulping tank according to a ratio, adding crushed salt slag particles while stirring, and controlling the solid-liquid mass ratio to be 1.2-2;
3) adjusting the content of organic matters in the salt slurry: in the pulping process in the step 2), according to the organic matter content in the industrial salt residues and the temperature control requirement of the high-temperature pyrolyzer, separating partial centrifugate and organic matters in organic foam by using a membrane method or a distillation method through an organic matter adjusting system to obtain condensate with the organic matter content of 5-25% or brine and organic liquid with the organic matter content of 40-60%, adjusting the mass fraction of the organic matters in the salt slurry by adding the condensate with the organic matter content of 5-25% and the organic liquid with the organic matter content of 40-60%, and finally controlling the organic matter content of the salt residues entering the high-temperature pyrolyzer;
4) homogenizing salt slurry: starting a salt slurry conveying pump while working in the steps 2) and 3), and finally crushing salt slag particles into a crystalline state by using the impact of salt slag and an impeller, wherein the particle size is controlled to be less than or equal to 220 micrometers; the particle size does not meet the requirement, and the salt slurry is conveyed to the pulping tank by the circulating pipeline to circulate for one or more times;
5) and centrifugal dehydration: directly conveying the prepared salt slurry to a centrifugal machine through a salt slurry conveying pump for dewatering; or conveying the salt slurry to a storage tank with a stirring function through a conveying pump for storage, and conveying the salt slurry to a centrifugal machine through a salt slurry conveying pump for dehydration, wherein the water content in the dehydrated salt slag crystalline particles is 3-6%;
6) drying the salt slag: the dryer adopts a fast fluidized bed, and the drying temperature is as follows: fully contacting the hot gas with the salt slag at 70-120 ℃, stirring the salt slag, and drying the salt slag crystalline particles by utilizing the difference of water partial pressure between the salt slag and the gas;
7) gas-solid separation of the bag-type dust collector: step 6), after drying, sending the dried salt slag into a bag-type dust collector and a transition bin through air flow, carrying out gas-solid separation in the bag-type dust collector, enabling the gas to enter a subsequent tail gas treatment system, enabling the salt slag crystalline particles to fall into the transition bin, and enabling the content of organic matters in the salt slag crystalline particles to be 1.0-2.5%;
8) and high-temperature pyrolysis: and 7) performing high-temperature pyrolysis on the salt slag in a pyrolysis tower to completely remove organic matters in the salt slag crystalline particles.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar parts; the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent.
The present invention is not limited to the above embodiments, and various other equivalent modifications, substitutions and alterations can be made without departing from the basic technical concept of the invention as described above, according to the common technical knowledge and conventional means in the field.
Claims (5)
1. The utility model provides an industry salt sediment pretreatment systems which characterized in that: comprises a crusher and a pulping tank, wherein the salt residue particles crushed by the crusher are sent into the pulping tank with a stirring function;
a conveyor is arranged at the discharge port of the crusher and the feed port of the pulping tank, and is used for conveying crushed salt slag particles into the pulping tank;
the pulping tank is connected with an organic matter adjusting system for adjusting the content of organic matters in the pulp in the pulping tank, the pulp outlet of the pulping tank is connected with a centrifugal machine through a conveying pipeline, and a salt pulp conveying pump is mounted on the conveying pipeline and used for conveying salt pulp;
a filter is also arranged on a conveying pipeline between the slurry outlet of the pulping tank and the salt slurry conveying pump, and the filter filters salt residue particles with the particle size of more than or equal to 8 mm;
the outlet of the salt slurry conveying pump is also provided with a circulating pipeline, and the circulating pipeline circularly conveys salt slag slurry with unqualified particle size into a pulping tank;
the organic matter adjusting system is communicated with the pulping tank and comprises an organic matter separating device and an organic matter supplying device, the organic matter separating device adopts a membrane method or a distillation method separating device, and foam containing organic matters on the upper layer is sent into the organic matter separating device by a suction method when the pulping tank is used for pulping;
the organic matter replenishing device respectively stores the brine or condensate and the organic liquid with high organic matter content generated by the organic matter separation device, and finally controls the content of the organic matter in the salt residue entering the pyrolysis tower to replenish the brine or condensate and the organic liquid according to the organic matter content of the industrial salt residue and the control requirement of the high-temperature pyrolysis temperature;
the discharge port of the centrifuge is communicated with the feed port of the dryer, the centrifuge centrifugate is conveyed into the pulping tank through a pipeline for pulping, the discharge port of the dryer conveys dried salt slag particles into the bag-type dust collector and the transition bin through air flow, and the discharge end of the transition bin outputs the salt slag particles into the pyrolysis tower;
the salt slurry storage tank with the stirring function is installed on a conveying pipeline between the pulping tank and the centrifugal machine, salt slurry conveying pumps are installed on pipelines on the two sides of the feeding end and the discharging end of the salt slurry storage tank respectively, the salt slurry conveying pump at the feeding end adopts a slurry pump to convey salt slurry for the salt slurry storage tank, and the salt slurry conveying pump at the discharging end adopts a centrifugal pump to convey salt slurry for the centrifugal machine.
2. The industrial salt slag pretreatment system of claim 1, wherein: the salt slurry conveying pump adopts a slurry pump.
3. The industrial salt slag pretreatment system of claim 1, wherein: the bag-type dust collector and the transition bin are of an integral structure.
4. The industrial salt slag pretreatment system of claim 1, wherein: the dryer adopts a high-temperature fast fluidized bed.
5. The method for pretreating industrial salt slag by using the pretreatment system for industrial salt slag as claimed in claim 1 is characterized by comprising the following steps of:
1) crushing salt slag: the salt slag is sent into a crusher to be crushed, so that the particle size of salt slag particles is less than or equal to 12 mm;
2) salt residue pulping: after the system is debugged, adding a centrifugate generated by a centrifugal machine, a saline water or condensate generated by an organic matter adjusting system and an organic liquid into a pulping tank according to the organic matter content in the salt slag and the temperature control requirement of a high-temperature pyrolyzer in proportion, adding crushed salt slag particles while stirring, and controlling the solid-liquid mass ratio to be 1.2-2;
3) adjusting the content of organic matters in the salt slurry: in the pulping process in the step 2), according to the organic matter content in the salt residue and the temperature control requirement of the high-temperature pyrolyzer, separating partial centrifugate and organic matters in organic foam by using a membrane method or a distillation method through an organic matter adjusting system to obtain condensate or brine with the organic matter content of 5-25% and organic liquid with the organic matter content of 40-60%, adjusting the mass fraction of the organic matters in the salt slurry by adding the condensate with the organic matter content of 5-25% and the organic liquid with the organic matter content of 40-60%, and finally controlling the content of the organic matters in the salt residue entering the high-temperature pyrolyzer;
4) homogenizing salt slurry: starting a salt slurry conveying pump while working in the steps 2) and 3), and finally crushing salt slag particles into a crystalline state by using the impact of salt slag and an impeller, wherein the particle size is controlled to be less than or equal to 220 micrometers; the particle size does not meet the requirement, and the salt slurry is conveyed to the pulping tank by the circulating pipeline to circulate for one or more times;
5) and centrifugal dehydration: directly conveying the prepared salt slurry to a centrifugal machine through a salt slurry conveying pump for dewatering; or conveying the salt slurry to a storage tank with a stirring function through a conveying pump for storage, and conveying the salt slurry to a centrifugal machine through a salt slurry conveying pump for dehydration, wherein the water content in the dehydrated salt slag crystalline particles is 3-6%;
6) drying the salt slag: the dryer adopts a fast fluidized bed, and the drying temperature is as follows: fully contacting the hot gas with the salt slag at 70-120 ℃, stirring the salt slag, and drying the salt slag crystalline particles by utilizing the difference of water partial pressure between the salt slag and the gas;
7) gas-solid separation of the bag-type dust collector: step 6), after drying, sending the dried salt slag into a bag-type dust collector and a transition bin through air flow, carrying out gas-solid separation in the bag-type dust collector, enabling the gas to enter a subsequent tail gas treatment system, enabling the salt slag crystalline particles to fall into the transition bin, and enabling the content of organic matters in the salt slag crystalline particles to be 1.0-2.5%;
8) and high-temperature pyrolysis: and 7) performing high-temperature pyrolysis on the salt slag in a pyrolysis tower to completely remove organic matters in the salt slag crystalline particles.
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| US7179379B2 (en) * | 2003-03-28 | 2007-02-20 | Ab-Cwt, Llc | Apparatus for separating particulates from a suspension, and uses thereof |
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