CN109882854B - Method for innocent treatment of industrial waste salt slag by high-temperature pyrolysis through suspension incineration technology - Google Patents
Method for innocent treatment of industrial waste salt slag by high-temperature pyrolysis through suspension incineration technology Download PDFInfo
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Abstract
The invention relates to a method for harmlessly treating industrial waste salt slag by high-temperature pyrolysis by using a suspension incineration technology, which uses a suspension incineration device to replace a commonly used heat pipe pyrolysis furnace for industrial waste salt treatment. Not only can prevent the industrial waste salt from caking, but also can improve the heat efficiency, and can continuously treat the industrial waste salt on a large scale; the low-temperature grading carbonization technology is adopted, and different carbonization temperatures and carbonization methods are selected according to the critical softening points and the critical carbonization points of different salt residues, so that the problems of waste salt softening, equipment bonding, uneven carbonization, incomplete impurity removal and the like in the high-temperature carbonization treatment or direct high-temperature treatment process of waste salt are solved. The purpose of directly dumping salt resources to the ocean to return the salt resources to the nature or utilize the salt resources as industrial salt production raw materials is achieved. The method has the advantages of simple process treatment and low cost, can prevent the industrial waste salt from caking, can improve the heat efficiency by treating the industrial waste salt through the method, can continuously treat the industrial waste salt in a large batch, and has obvious economic benefit and environmental protection benefit.
Description
Technical Field
The invention belongs to the technical field of industrial waste residue treatment, and particularly relates to a method for performing high-temperature pyrolysis harmless treatment on industrial waste salt residues by using a suspension incineration technology.
Background
In the chemical industry, a large amount of waste salt residues (the main component is sodium chloride) are generated in the production process of many enterprises, and the waste salt residues can be roughly divided into single waste salt, mixed salt and waste salt containing organic matters. The single waste salt refers to a salt containing one of sodium chloride, sodium nitrate, calcium chloride, magnesium chloride, sodium sulfide and the like; the mixed salt refers to a salt containing a plurality of components; the waste salt containing organic matters has a large amount of organic matters carried in the waste salt, has strong pungent smell and belongs to harmful substances. Especially in the field of fine chemistry. For example, 1t of Alkyl Ketene Dimer (AKD) is produced with 2t of waste sodium chloride salt. In the past, the industrial waste sodium chloride is accumulated everywhere as solid waste, or is treated slightly, such as being dissolved by water and then diluted and directly discharged, so that the treatment causes serious damage to underground water resources and ecosystems. In addition, since this part of the waste salt contains some inorganic or organic impurities, it cannot be used directly as industrial raw salt, and even in the food or pharmaceutical industry, and most of the solutions used in the factory today are to pack it in landfills. This treatment results on the one hand in a reduced utilization of the land and on the other hand the loss of salt and its impurities can salinize the soil and pollute the surrounding environment. Therefore, the part of the waste salt slag is one of the problems facing the chemical enterprises and needing to be solved urgently. The latest edition of the national hazardous waste book is formally implemented, and a series of technical and system documents for identifying and evaluating environmental damage are also put out in succession, which shows that the management of hazardous wastes in China is stricter. Chemical enterprises need to enhance the resource utilization and harmless disposal of waste salt and residues and prepare for treatment.
At present, the technologies for harmless treatment of industrial waste salt slag mainly comprise the following three technologies:
(1) the salt washing method is to dissolve organic matters in the waste salt by using an organic or inorganic solvent to separate impurities from sodium chloride. The method comprises the steps of washing and recovering monoether by xylene, heating and drying salt slag under vacuum to recover a solvent, converting the salt slag into utilizable industrial salt, and reducing environmental pollution caused by industrial three wastes. The method has high treatment cost, and the adopted organic solvent is easy to cause secondary pollution.
(2) The alkali making method is to obtain alkali by reacting other substances with sodium chloride in industrial waste salt residue. For example, the Jiangsuchun group is respectively introduced with ammonia gas, carbon dioxide and water in a saturated sodium chloride solution to produce sodium bicarbonate and ammonium chloride. The method has long process route, large investment and high production cost.
(3) High-temperature treatment, i.e. decomposing organic matters in the waste salt slag into gas and volatilizing the gas by utilizing a high-temperature incineration process. However, in the incineration process, the industrial waste salt is easy to agglomerate to cause equipment adhesion, the thermal efficiency is low to cause uneven carbonization, and impurities are not removed completely.
In view of the above problems caused by the high temperature treatment of industrial waste salt slag, the applicant proposes the following solutions: the suspension incinerator is used for replacing a commonly used heat pipe pyrolysis furnace for industrial waste salt treatment, so that the industrial waste salt can be prevented from caking, the heat efficiency can be improved, and the industrial waste salt can be continuously treated in a large batch; the low-temperature grading carbonization technology is adopted, and different carbonization temperatures and carbonization methods are selected according to the critical softening points and the critical carbonization points of different salt residues, so that the problems of waste salt softening, equipment bonding, uneven carbonization, incomplete impurity removal and the like in the high-temperature carbonization treatment or direct high-temperature treatment process of waste salt are solved.
The invention aims to innocent treat industrial waste salt slag by a common waste salt treatment means, namely a high-temperature treatment method with simple process and low cost, and achieve the aim of directly dumping salt resources to the ocean to return the salt resources to the nature or recycle the salt resources as production raw materials of industrial salt (such as building material additives).
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the existing high-temperature treatment technology of industrial waste salt slag, and provides a method for harmless treatment of industrial waste salt slag by high-temperature pyrolysis through a suspension incineration technology.
A method for innocent treatment of industrial waste salt slag by high-temperature pyrolysis by using a suspension incineration technology comprises the following steps:
(1) mixing industrial waste salt slag according to categories and uniformly mixing;
(2) drying the mixed ingredients to remove free water and part of the crystal water;
(3) performing circulating high-temperature suspension pyrolysis on the ingredients obtained in the step (2) for a plurality of times to obtain solid waste salt and waste gas;
(4) detecting the solid waste salt obtained in the step (3), cooling and detecting to be qualified, taking the solid waste salt as industrial raw material salt for sale or self-recycling, and treating unqualified salt in the step (3) again until the salt is qualified;
(5) and (4) utilizing waste heat of the waste gas generated in the step (3) and then discharging the waste gas into the atmosphere through a tail gas treatment device.
Preferably, the ingredients of the industrial waste salt slag comprise raw powder and fuel, and the fuel is added into the high-temperature suspension pyrolysis device together with the raw powder in a gaseous state to participate in combustion.
Preferably, the raw powder materials in the waste salt residue mixed in the step (1) do not react with each other in the pyrolysis temperature range.
Preferably, the hot blast stove is adopted in the step (2) for drying the ingredients, the heat used for drying the ingredients is waste gas generated by circulating high-temperature pyrolysis, the drying temperature is 60-250 ℃, and the atmosphere is micro-positive pressure.
Preferably, the step (3) at least comprises four times of circulating high-temperature suspension pyrolysis, the temperature of the high-temperature suspension pyrolysis is 200-600 ℃, and the temperature of the high-temperature pyrolysis is sequentially increased along with the number of stages of the circulation.
Preferably, the apparatus used for circulating the high-temperature suspension pyrolysis in the step (3) comprises: the suspension incinerators are connected in a plurality of stages, each stage of suspension incinerator is provided with a feed opening, a feed opening and an air outlet from bottom to top, and a heating device is arranged between the feed opening and the feed opening; the exhaust port of the first-stage suspension incinerator is connected with a tail gas treatment device, the feeding port is connected with a feeder and a discharging port of the second-stage suspension incinerator, the material fed by the feeder is blown into the feeding port of the first-stage suspension incinerator by the gas discharged from the exhaust port of the second-stage suspension incinerator, the discharging port of the first-stage suspension incinerator is connected with the feeding port of the second-stage suspension incinerator and the exhaust port of the third-stage suspension incinerator, and the material discharged from the discharging port of the first-stage suspension incinerator is blown into the feeding port of the second-stage suspension incinerator by the gas discharged from the exhaust port of the third-stage suspension incinerator; by analogy, the feed inlet of the last stage of suspension incinerator is connected with the feed outlet of the previous stage of suspension incinerator and the compressor, the compressor supplies gas to blow the material discharged by the previous stage of suspension incinerator into the feed inlet of the previous stage of suspension incinerator, and the feed outlet of the last stage of suspension incinerator is connected with the product collecting device.
Preferably, the feed opening of suspension incinerator passes through the exit or the air supply of return bend connection next-level suspension incinerator, the department of buckling of return bend is provided with spills the glassware, spill the glassware and connect the exit or the feeder of last-level suspension incinerator, the material is evenly spilt to the return bend in by spilling the glassware to turn over under the effect of air current and upwards get into in the feed opening.
Preferably, air locking valves are arranged at the feed openings of the feeder and the suspension incinerators of all stages.
Preferably, the feeder is a screw feeder or a vibration feeder.
Preferably, a waste heat utilization device is connected between the exhaust port of the first-stage suspension burner and the tail gas treatment device.
Preferably, the heating device is a resistance wire heating sleeve, and each resistance wire heating sleeve is connected with a temperature controller.
Preferably, an air inlet chamber, a flowmeter and a buffer tank are connected between the last stage of suspension incinerator and the compressor in sequence.
Preferably, the air inlet chamber links to each other with last one-level suspension incinerator's material loading mouth, flowmeter, last one-level suspension incinerator's feed opening, product collection device from top to bottom respectively, the compressed gas that the compressor provided gets into the air inlet chamber through buffer tank and flowmeter to blow into last one-level suspension incinerator exhaust material loading mouth, last one-level suspension incinerator exhaust material is discharged after the air-cooled in the air inlet chamber product collection device.
Preferably, the bottom of the suspension burner is bucket-shaped.
Preferably, the last stage of suspension incinerator is connected with a differential pressure gauge, the differential pressure gauge detects real-time differential pressure in the last stage of suspension incinerator, and the flowmeter and the buffer tank are matched with the real-time differential pressure to control the required air volume during production. .
Preferably, the criteria for qualifying the detection in step (4) are: the COD value of the solution prepared by the obtained product into 20% aqueous solution is less than 150ppm, and the solution belongs to class III through acute toxicity detection.
Preferably, the tail gas treatment device in the step (5) comprises a cloth bag dust collection device, an electrostatic dust collection device and an alkali washing device which are connected in sequence.
The suspension incineration technology adopted by the invention enables the waste salt slag to enter the suspension incinerator along with the movement of the airflow in the turning direction under the impact of the high-speed ascending airflow, and meanwhile, the waste salt slag is rapidly dispersed into a suspension state in the suspension incinerator, and the suspension state can improve the thermal efficiency and simultaneously prevent the waste salt from caking. The hot air with high temperature can carbonize and crack the organic matters in the waste salt slag. Because the inner space of the suspension incinerator is larger than that of the feeding pipeline, the flow speed of the powder material after entering the suspension incinerator is reduced under the resistance action of the cylinder wall, so that the powder material falls to the bottom of the suspension incinerator in a spiral shape. And then, discharging powder to the next-stage suspension incinerator at regular time, continuing heating until all organic matters in the waste salt slag are carbonized and cracked to achieve the aim of harmless treatment, and discharging the residual heat of the redundant waste gas into the atmosphere through a tail gas treatment device.
Compared with the prior art, the invention has the following excellent effects:
(1) the material is suspended in the hot air flow, and the contact area of the material and the air flow is greatly increased, so that the heat transfer speed is extremely high, and the heat transfer efficiency is very high.
(2) The raw material powder and the fuel are uniformly mixed in a suspension state, and the heat generated by the combustion of the fuel is transferred to the material in time to enable the material to be rapidly decomposed.
(3) Because the heat transfer and mass transfer are rapid, the production efficiency and the thermal efficiency are greatly improved.
Drawings
The invention is further illustrated by means of the attached drawings, the examples of which are not to be construed as limiting the invention in any way.
FIG. 1 is a schematic view of the structure of the apparatus used in the suspension incineration technique of the present invention;
FIG. 2 is a process flow diagram of the present invention for the harmless treatment of industrial waste salt residue by high-temperature pyrolysis using a suspension incineration technique;
FIG. 3 is a comparison graph of the morphology of samples before and after treatment by the method of the invention for the harmless treatment of industrial waste salt residues by high-temperature pyrolysis through the suspension incineration technology, wherein (1) and (3) are the morphology of the samples before and after treatment in example 1, respectively, and (2) and (4) are the morphology of the samples before and after treatment in example 2, respectively;
FIG. 4 is a comparison of XPS plots of samples before and after treatment by the method of the present invention for the innocent treatment of industrial waste salt residues by high-temperature pyrolysis using the suspension incineration technique, wherein (1) and (3) are XPS plots of products before and after treatment in example 1, respectively, and (2) and (4) are XPS plots of samples before and after treatment in example 2, respectively;
FIG. 5 is a comparison graph of COD values of 20% aqueous solutions prepared from samples before and after treatment by the method of innocent treatment of industrial waste salt residues by high-temperature pyrolysis using the suspension incineration technique of the present invention, wherein columns 1 and 3 are the COD values of the products before and after treatment in example 1, respectively, and columns 2 and 4 are the COD values of the samples before and after treatment in example 2, respectively.
The figures in the drawings are labeled as:
1, a first-stage suspension incinerator; 2, a second-stage suspension burner; 3, a third-stage suspension burner; 4, a fourth-stage suspension burner; 5, a material spreader; 6, a wind locking valve; 7, a resistance wire heating sleeve; 8, a flow meter; 9, a buffer tank; 10, a differential pressure gauge; 11, a bucket type material lifting machine; 12, a feeder; 13, a temperature controller; 14, a compressor; 15, a feed opening; 16, a feeding port; 17, an air outlet; 18, bending the pipe; 19, an air inlet chamber.
Detailed Description
In order that the invention may be more readily understood, specific embodiments thereof will be described further below.
The invention provides a method for harmless treatment of industrial waste salt slag by high-temperature pyrolysis by using a suspension incineration technology, which comprises the following steps: the classified industrial waste salt slag (the components are prevented from chemical reaction at high temperature) is proportioned and evenly mixed; the ingredients are dried to remove free water and part of crystal water, and then sent into a high-temperature suspension incineration device for incineration or pyrolysis, and waste salt solid-gas obtained after pyrolysis is separated and cooled and then is put into storage; testing the COD value of the solution after the product is prepared into a 20% aqueous solution, if the COD value is less than 150ppm and the solution belongs to III class through acute toxicity detection, determining the solution to be a qualified product which can be sold or recycled by self as industrial raw material salt, and sending the unqualified product into a high-temperature suspension incineration device again for incineration or pyrolysis treatment until the qualified product is obtained; waste gas generated in the treatment process is discharged into the atmosphere after being utilized through a cloth bag dust collection device, an electrostatic dust collection device and an alkali washing device;
and determining the effect (whether the effect meets the qualified standard) of the treated waste salt slag by using XPS and COD value comparison graphs before and after the treatment of the waste salt slag.
The following examples were carried out according to the above procedure using the reagents listed in Table 1.
TABLE 1 list of reagents
The suspension incineration technology adopts equipment as shown in figure 1. Comprises a first-stage suspension incinerator 1, a second-stage suspension incinerator 2, a third-stage suspension incinerator 3 and a fourth-stage suspension incinerator 4 which are sequentially connected. Each stage of suspension incinerator is provided with a feed opening 15, a feeding opening 16 and an air outlet 17 from bottom to top, resistance wire heating sleeves 7 are arranged between the feed opening 15 and the feeding opening 16, and each resistance wire heating sleeve 7 is connected with an independent temperature controller 13.
Waste heat utilization equipment and tail gas processing apparatus are connected to the air exit 17 of first order suspension incinerator 1, and the air exit 17 of second level suspension incinerator 2 is connected through 90 return bend 18 to material loading mouth 16, and the department of buckling of feeder 12 intercommunication return bend 18, just the department of buckling is provided with spills glassware 5, be used for to evenly spill the material in the return bend 18, the material of spilling is in the material loading mouth 16 of first order suspension incinerator 1 of direction entering of turning over under the ascending air current effect of second level suspension incinerator 2 exhaust.
The material loading mouth 16 of second level suspension incinerator 2 is connected the air exit 17 of third level suspension incinerator 3 through 90 return bend 18, and the feed opening 15 of first level suspension incinerator 1 is connected through spilling glassware 5 the department of buckling of return bend 18, first level suspension incinerator 1 exhaust material is turned over the direction and gets into in the material loading mouth 16 of second level suspension incinerator 2 under the effect of third level suspension incinerator 3 exhaust updraft.
The feed inlet 16 of third level suspension incinerator 3 is connected the air exit 17 of fourth level suspension incinerator 4 through 90 return bend 18, and the feed outlet 15 of second level suspension incinerator 2 is connected through spilling glassware 5 the department of buckling of return bend 18, second level suspension incinerator 2 exhaust material is turned over the direction and gets into in the feed inlet 16 of third level suspension incinerator 3 under the effect of the ascending air current of fourth level suspension incinerator 4 exhaust.
The material loading mouth 16 of fourth level suspension incinerator 4 connects air inlet chamber 19 through 90 return bend 18, and the feed opening 15 of third level suspension incinerator 3 is connected through spreader 5 the department of buckling of return bend 18, third level suspension incinerator 3 exhaust material turn over the direction under the ascending air current effect of air inlet chamber 19 exhaust and get into in the material loading mouth 16 of fourth level suspension incinerator 4.
The air inlet chamber 19 is connected with the flowmeter 8, the buffer tank 9 and the compressor 14 in series in sequence, and raw compressed air is provided by the compressor 14. The top, the upper part, the lower part and the bottom of the air inlet chamber 19 are respectively connected with a feeding port 16 of the fourth-stage suspension incinerator 4, a flowmeter 8, a discharging port 15 of the fourth-stage suspension incinerator 4 and a product collecting device; compressed gas that compressor 14 provided gets into air inlet chamber 19 through buffer tank 9 and flowmeter 8, and compressed gas in the air inlet chamber 19 blows in the material of third level suspension incinerator 3 exhaust into the material loading mouth 16 of fourth level suspension incinerator 4, plays the air-cooled effect to fourth level suspension incinerator 4 exhaust material simultaneously, and the material after the air-cooled finally discharges into product collection device.
A bucket elevator 11 is connected to the feeder 12 to supply the feeder 12 with material.
Each stage of suspension incinerator is a bucket-shaped structure with a wide upper part and a narrow lower part, and is convenient for discharging pyrolyzed materials.
An air locking valve 6 is arranged between the discharge opening 15 of each stage of suspension incinerator and the material spreader 5, so that the uniformity of discharging is kept, air is locked, and materials are prevented from being blown into the discharge opening 15 under the action of ascending air flow.
Fourth level suspension incinerator 4 is connected with differential pressure gauge 10 for monitor wind pressure, cooperation flowmeter 8 and buffer tank 9, the control compressor 14 of being convenient for blow out appropriate amount of wind and guarantee that the material homodisperse suspends in the air current, improves the incineration efficiency of material.
Example 1
Ion membrane caustic soda byproduct innocent treatment
(1) The ionic membrane caustic soda by-product was tested for XPS and corresponding COD value (the by-product was tested after being made into a 20% aqueous solution).
(2) The accessory of the by-product adopts the waste heat of suspension incineration high-temperature flue gas and assists the hot blast stove to dry, the drying temperature is controlled at 250 ℃, and the atmosphere is controlled at micro-positive pressure.
(3) The dried ingredients are fed to a vibratory feeder 12 by means of a bucket elevator 11.
(4) The vibration feeder 12 feeds the ingredients from the feed inlet 16 of the first stage suspension burner 1 to the elbow 18 of the second stage suspension separator 2.
(5) The temperature in the first stage suspension incinerator 1 is controlled to be 300 ℃, the temperature in the second stage suspension separator 2 is controlled to be 400 ℃, the temperature in the third stage suspension separator 3 is controlled to be 500 ℃, and the temperature in the fourth stage suspension separator 4 is controlled to be 600 ℃.
(6) The product from the fourth stage suspension separator 4 is cooled by blowing cold air into the air inlet chamber 19, then XPS and corresponding COD value are measured again (the by-product is measured after preparing 20% aqueous solution), if not, the product is sent into the vibration feeder 12 again and then is heat treated again.
(7) And tail gas from an air outlet 17 of the first-stage suspension incinerator 1 is discharged into the atmosphere after passing through a tail gas treatment system consisting of a cloth bag dust collection device, an electrostatic dust collection device, an alkali washing device and the like.
Example 2
Innocent treatment of furan phenol etherification by-product
(1) XPS and the corresponding COD value of the by-product of the furan phenol etherification reaction were tested (the by-product was tested after preparing a 20% aqueous solution).
(2) The accessory of the by-product adopts the waste heat of high-temperature flue gas generated by suspension incineration and assists the hot blast stove to dry, the drying temperature is controlled at 150 ℃, and the atmosphere is controlled at micro-positive pressure.
(3) The dried ingredients are fed to a screw feeder 12 by means of a bucket elevator 11.
(4) The screw feeder 12 feeds the batch from the feed inlet 16 of the first stage suspension burner 1 to the elbow 18 of the second stage suspension separator 2.
(5) The temperature in the first stage suspension burner 1 was controlled to 200 ℃, the temperature in the second stage suspension separator 2 was controlled to 310 ℃, the temperature in the third stage suspension separator 3 was controlled to 420 ℃, and the temperature in the fourth stage suspension separator 4 was controlled to 550 ℃.
(6) The product from the fourth stage suspension separator 4 is cooled by blowing cold air into the air inlet chamber 19, then XPS and the corresponding COD value are measured again (the by-product is measured after being prepared into 20% aqueous solution), if the product is not qualified, the product is sent into the screw feeder 12 again and then is heat treated again.
(7) And tail gas from an air outlet 17 of the first-stage suspension incinerator 1 is discharged into the atmosphere after passing through a tail gas treatment system consisting of a cloth bag dust collection device, an electrostatic dust collection device, an alkali washing device and the like.
The process flow of the suspension incineration technology for the high-temperature pyrolysis harmless treatment of the industrial waste salt slag in all the embodiments of the invention is shown in figure 2. The core components are suspension incinerators and heat exchange pipelines (including a bent pipe 18 and a blanking pipeline connecting the bent pipe 18 and a blanking port 15) for connecting the suspension incinerators. The heat exchange pipeline is important equipment in a suspension incineration system, and not only bears the connection between an upper suspension incinerator and a lower suspension incinerator and the conveying task of gas-solid flow, but also bears the heat exchange tasks of material dispersion, uniform distribution, air locking and gas-solid phase. Under the impact of high-speed high-temperature air flow, the raw powder fed into the heat exchange pipeline is deflected upwards to move and disperse along with the air flow, and simultaneously, organic matters in the raw powder are carbonized and cracked to achieve the aim of harmlessness.
The comparative color chart of the industrial waste salt slag samples before and after the harmless treatment in the embodiment of the invention is shown in FIG. 3 (examples 1 and 2 correspond to (1) and (3), (2) and (4) in the chart, respectively). The color of the sample obtained after all the examples treatment is close to that of the industrial salt (white or light yellow).
An XPS comparison graph of industrial waste salt slag samples before and after innocent treatment of the embodiment of the invention is shown in FIG. 4. The C, H element content in the samples ((3), (4)) obtained after the treatment of examples 1 and 2 was reduced to a very low level compared to the samples (1) and (2) before the treatment, indicating that the sintering process during the treatment had removed the harmful organic components, and the very low C, H element content in samples (3) and (4) may result from the C, H element component in the air adsorbed during the sample testing.
A comparison graph of COD values of 20% aqueous solutions of industrial waste salt slag samples before and after the harmless treatment in the example of the present invention is shown in FIG. 5 (COD values before and after the treatment in examples 1 and 2 correspond to 1 and 3, 2 and 4 in the graph, respectively). All samples treated in the examples reach the standard that the COD value of the qualified product is less than 150 ppm.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention and are equivalent to the replacement of the above embodiments are included in the protection scope of the present invention.
Claims (8)
1. A method for innocent treatment of industrial waste salt slag by high-temperature pyrolysis by using a suspension incineration technology is characterized by comprising the following steps:
(1) the method comprises the following steps of (1) mixing industrial waste salt slag according to types and uniformly mixing, wherein the mixture of the industrial waste salt slag comprises raw powder and fuel, and the fuel is added into a high-temperature suspension pyrolysis device along with the raw powder in a gaseous state to participate in combustion;
(2) drying the mixed ingredients to remove free water and part of the crystal water;
(3) performing circulating high-temperature suspension pyrolysis on the ingredients obtained in the step (2) for a plurality of times to obtain solid waste salt and waste gas;
(4) detecting the solid waste salt obtained in the step (3), cooling and detecting to be qualified, taking the solid waste salt as industrial raw material salt for sale or self-recycling, and treating unqualified salt in the step (3) again until the salt is qualified;
(5) the waste gas generated in the step (3) is discharged into the atmosphere through a tail gas treatment device after waste heat utilization;
wherein, the device adopted in the step (3) for circulating high-temperature suspension pyrolysis comprises: the suspension incinerators are connected in a plurality of stages, each stage of suspension incinerator is provided with a feed opening, a feed opening and an air outlet from bottom to top, a heating device is arranged between the feed opening and the feed opening, the heating device is a resistance wire heating sleeve, and each resistance wire heating sleeve is connected with a temperature controller; the exhaust port of the first-stage suspension incinerator is connected with a tail gas treatment device, the feeding port is connected with a feeder and the exhaust port of the second-stage suspension incinerator, the material fed by the feeder is blown into the feeding port of the first-stage suspension incinerator by the gas discharged from the exhaust port of the second-stage suspension incinerator, the discharging port of the first-stage suspension incinerator is connected with the feeding port of the second-stage suspension incinerator and the exhaust port of the third-stage suspension incinerator, and the material discharged from the discharging port of the first-stage suspension incinerator is blown into the feeding port of the second-stage suspension incinerator by the gas discharged from the exhaust port of the third-stage suspension incinerator; in this way, the feeding port of the last stage of suspension incinerator is connected with the discharging port of the previous stage of suspension incinerator and the compressor, the compressor supplies gas to blow the material discharged by the previous stage of suspension incinerator into the feeding port of the compressor, and the discharging port of the last stage of suspension incinerator is connected with the product collecting device; an air inlet chamber, a flowmeter and a buffer tank are sequentially connected between the final stage of suspension incinerator and the compressor; last one-level suspension incinerator is connected with the differential pressure gauge, the differential pressure gauge is used for monitoring the wind pressure, cooperation flowmeter and buffer tank, and the control compressor of being convenient for blows off suitable amount of wind and guarantees that the material homodisperse suspends in the air current, improves the incineration efficiency of material.
2. The method for the high-temperature pyrolysis harmless treatment of the industrial waste salt slag by using the suspension incineration technology as claimed in claim 1, wherein the method comprises the following steps: the waste salt residues mixed in the step (1) do not react with each other within the pyrolysis temperature range.
3. The method for the high-temperature pyrolysis harmless treatment of the industrial waste salt slag by using the suspension incineration technology as claimed in claim 1, wherein the method comprises the following steps: and (2) drying the ingredients by using a hot blast stove, wherein the heat used for drying the ingredients comes from waste gas generated by circulating high-temperature suspension pyrolysis, the drying temperature is 60-250 ℃, and the atmosphere is micro-positive pressure.
4. The method for the high-temperature pyrolysis harmless treatment of the industrial waste salt slag by using the suspension incineration technology as claimed in claim 1, wherein the method comprises the following steps: and (3) performing high-temperature suspension pyrolysis for at least four times, wherein the temperature of the high-temperature suspension pyrolysis is 200-600 ℃, and the temperature of the high-temperature pyrolysis is sequentially increased along with the number of times of circulation.
5. The method for the high-temperature pyrolysis harmless treatment of the industrial waste salt slag by using the suspension incineration technology as claimed in claim 1, wherein the method comprises the following steps: the air outlet or the air supply that the feed opening of suspension incinerator passes through the return bend and connects next-level suspension incinerator, the department of buckling of return bend is provided with spills the glassware, spill the glassware and connect the feed opening or the feeder of last-level suspension incinerator, the material is evenly spilt to the return bend in by spilling the glassware to in the effect of air current turns up and gets into the feed opening.
6. The method for the high-temperature pyrolysis harmless treatment of the industrial waste salt slag by using the suspension incineration technology as claimed in claim 1, wherein the method comprises the following steps: and air locking valves are arranged at the feed openings of the feeder and the suspension incinerators at all stages.
7. The method for the high-temperature pyrolysis harmless treatment of the industrial waste salt slag by using the suspension incineration technology as claimed in claim 1, wherein the method comprises the following steps: the qualified standard in the step (4) is as follows: the COD value of the solution prepared by the obtained product into 20% aqueous solution is less than 150ppm, and the solution belongs to class III through acute toxicity detection.
8. The method for the high-temperature pyrolysis harmless treatment of the industrial waste salt slag by using the suspension incineration technology as claimed in claim 1, wherein the method comprises the following steps: and (5) the tail gas treatment device comprises a cloth bag dust collection device, an electrostatic dust collection device and an alkali washing device.
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| CN201910081672.2A CN109882854B (en) | 2019-01-28 | 2019-01-28 | Method for innocent treatment of industrial waste salt slag by high-temperature pyrolysis through suspension incineration technology |
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| CN201910081672.2A CN109882854B (en) | 2019-01-28 | 2019-01-28 | Method for innocent treatment of industrial waste salt slag by high-temperature pyrolysis through suspension incineration technology |
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