CN109052411B - Recycling and harmless treatment device and method for industrial hazardous waste - Google Patents
Recycling and harmless treatment device and method for industrial hazardous waste Download PDFInfo
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- CN109052411B CN109052411B CN201811180107.3A CN201811180107A CN109052411B CN 109052411 B CN109052411 B CN 109052411B CN 201811180107 A CN201811180107 A CN 201811180107A CN 109052411 B CN109052411 B CN 109052411B
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- C01B33/00—Silicon; Compounds thereof
- C01B33/08—Compounds containing halogen
- C01B33/107—Halogenated silanes
- C01B33/1071—Tetrachloride, trichlorosilane or silicochloroform, dichlorosilane, monochlorosilane or mixtures thereof
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Abstract
The invention discloses a recycling and harmless treatment device and method for industrial hazardous waste, which comprises a drying and pyrolysis integrated machine, a solid slag tank, a recovery tank, a slag slurry feeding pipe and a steam input pipe, wherein the drying and pyrolysis integrated machine comprises five functional partitions which are a primary drying area, a secondary heating area, a horizontal conveying area, a catalytic cracking area and a secondary pyrolysis area respectively, the steam input pipe is communicated with the primary drying area, a primary gas phase recovery pipe is also arranged on the primary drying area, and the other end of the primary gas phase recovery pipe is connected with a primary condenser The method has the advantages of safety, high raw material recovery rate, good economic benefit, reduction of waste discharge and environmental protection.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a recycling and harmless treatment device and method for industrial hazardous waste.
Background
In the fields of petrochemical industry and new energy, a rectification working section is an indispensable unit operation, heavy components after multi-stage rectification often contain a certain amount of solid wastes and high-boiling-point polymers, and the slag slurry cannot be directly discharged into air and can be discharged only after being treated to meet the environment-friendly discharge requirement. Taking a polysilicon production enterprise as an example, polysilicon production is always considered as a high-energy-consumption and high-pollution industry, in recent years, with the development of cold hydrogenation technology, silicon tetrachloride which is difficult to treat before is fully utilized, and the problem of pollutant treatment is immediately changed to the treatment of flowing solid-liquid mixed silicon slag slurry. At present, the treatment process of the slag slurry comprises a hydrolysis method, a drying method, a filtering method and the like. Currently, the most practical method is hydrolysis. The hydrolysis method has many disadvantages, such as the raw material waste is sacrificed, the hydrolysis reaction is violent, a large amount of acid mist is generated, white silicon dioxide foam solid is generated, and the environmental pollution is large.
Disclosure of Invention
The invention aims to provide a recycling and harmless treatment device and a method for industrial hazardous waste, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a useless resourceful and innocent treatment device of industry danger, includes dry pyrolysis all-in-one, solid sediment jar, recovery jar, sediment thick liquid inlet pipe and steam input pipe, dry pyrolysis all-in-one contains five functional partitions, is preliminary drying zone, the secondary zone of heating, horizontal transport district, catalytic cracking district and secondary pyrolysis district respectively, and steam input pipe and preliminary drying zone intercommunication still install elementary vapor recovery tube on the preliminary drying zone, and the other end of elementary vapor recovery tube is connected with the one-level condenser.
As a further scheme of the invention: the solid slag pot is arranged below the catalytic cracking zone, the catalytic cracking zone is communicated with the solid slag pot, a third-level gas phase recovery pipe is installed at the top of the solid slag pot, the third-level gas phase recovery pipe is communicated with the secondary pyrolysis zone, the lower end of the first-level condenser is communicated with the recovery pot, a second-level condenser is arranged above the recovery pot, the recovery pot is communicated with the second-level condenser, and gaseous substances in the recovery pot enter the second-level condenser.
As a still further scheme of the invention: and a secondary gas phase recovery pipe is arranged at the top of the secondary pyrolysis zone and is communicated with the middle part of the primary gas phase recovery pipe.
As a still further scheme of the invention: the bottom of the solid slag tank is provided with a discharge hole, the top of the solid slag tank is provided with a nitrogen adjusting pipe, and the nitrogen adjusting pipe is connected with a nitrogen source.
As a still further scheme of the invention: and a liquid discharge pipe is arranged at the bottom of the recovery tank.
As a still further scheme of the invention: and an exhaust pipe is arranged at the top end of the secondary condenser.
A method for recycling and harmlessly treating industrial hazardous waste comprises the following steps:
(1) injecting the slurry to be treated into a drying and pyrolysis integrated machine, introducing the slurry into a primary drying area, introducing steam, the method comprises the following steps of (1) carrying out primary drying evaporation on slag slurry, enabling gaseous substances in a primary drying area to enter a primary condenser, enabling the slag slurry treated by the primary drying area to enter a secondary heating area for further heating, enabling the gaseous substances generated in the secondary heating area to also enter the primary condenser through a primary gas phase recovery pipe, enabling the slag slurry in the secondary heating area to enter a horizontal conveying area, enabling the slag slurry in the horizontal conveying area to enter a catalytic cracking area, completing a thermal decomposition process of heavy components and polymers contained in the slag slurry in the catalytic cracking area, enabling the gaseous substances generated by the thermal decomposition to enter a secondary pyrolysis area for further decomposition, enabling the gaseous substances generated in the catalytic cracking area and the secondary pyrolysis area to enter the primary gas phase recovery pipe through a secondary gas phase recovery pipe, and finally entering the primary condenser; the waste residue in the catalytic cracking area finally falls into a solid residue tank;
(2) injecting nitrogen into the solid slag tank, increasing the pressure in the solid slag tank, and discharging the waste slag in the solid slag tank;
(3) gaseous substances generated by waste residues in the drying and pyrolysis integrated machine enter a primary condenser through a pipeline, the primary condenser is used for preliminarily condensing the gaseous substances, a gas-liquid mixture formed by condensing the gaseous substances through the primary condenser enters a recovery tank, the gaseous substances in the recovery tank enter a secondary condenser, and liquid substances formed by condensing the gaseous substances through the secondary condenser flow into the recovery tank again;
(4) the light components which are not condensed in the gaseous substances are discharged through the exhaust pipe, and the liquid substances in the recovery tank are discharged through the liquid discharge pipe.
As a still further scheme of the invention: and (2) cooling the primary condenser in the step (1) by adopting circulating water.
As a still further scheme of the invention: in the step (1), the temperature in the primary drying zone is 80-200 ℃.
Compared with the prior art, the invention has the beneficial effects that: the invention combines the drying process and the pyrolysis process, does not need to additionally add a treating agent, is simple and easy to implement, obtains the solid waste slag as the product, has low cost, greatly improves the treatment efficiency of the slag slurry by arranging the two-stage heating area and the two-stage pyrolysis area, ensures that heavy components and polymers in the slag slurry are decomposed more thoroughly, has simple and safe operation, high raw material recovery rate, reduces the production cost, has good economic benefit, reduces the discharge amount of waste and is more environment-friendly.
Drawings
FIG. 1 is a schematic diagram of a recycling and harmless treatment device for industrial hazardous wastes.
In the figure: 1-drying and pyrolyzing all-in-one machine; 2-a slag solidification tank; 3-a first-stage condenser; 4-a recovery tank; 5-a secondary condenser; 11-slurry feed pipe; 12-a primary gas phase recovery tube; 13-a secondary gas phase recovery pipe; 14-three-stage gas phase recovery pipes; 15-an exhaust pipe; 16-a drain pipe; 17-nitrogen gas adjusting tube; 18-a steam input pipe; 1 a-primary drying zone; 1 b-a secondary heating zone; 1 c-a horizontal transport zone; 1 d-a catalytic cracking zone; 1 f-secondary pyrolysis zone.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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.
Example 1
Referring to fig. 1, in the embodiment of the present invention, a recycling and harmless treatment apparatus for industrial hazardous waste includes a drying and pyrolysis integrated machine 1, a slag solidification tank 2, a recovery tank 4, a slurry feeding pipe 11 and a steam input pipe 18, where the drying and pyrolysis integrated machine 1 includes five functional partitions, which are a primary drying region 1a, a secondary heating region 1b, a horizontal conveying region 1c, a catalytic cracking region 1d and a secondary pyrolysis region 1f, the slurry feeding pipe 11 is communicated with the primary drying region 1a, the slurry to be treated is injected into the primary drying region 1a through the slurry feeding pipe 11, the steam input pipe 18 is communicated with the primary drying region 1a, steam is injected into the primary drying region 1a through the steam input pipe 18 to perform primary drying evaporation on the slurry, a primary gas phase recovery pipe 12 is further installed on the primary drying region 1a, and the other end of the primary gas phase recovery pipe 12 is connected with a primary condenser 3, gaseous substances in the primary drying area 1a enter a primary condenser 3, the primary drying area 1a is communicated with a secondary heating area 1b, the slag slurry treated by the primary drying area 1a enters the secondary heating area 1b for further heating, the gaseous substances generated in the secondary heating area 1b also enter the primary condenser 3 through a primary gas phase recovery pipe 12, the secondary heating area 1b is communicated with a horizontal conveying area 1c, the slag slurry in the secondary heating area 1b enters the horizontal conveying area 1c, the other end of the horizontal conveying area 1c is communicated with a catalytic cracking area 1d, the slag slurry in the horizontal conveying area 1c enters the catalytic cracking area 1d, heavy components and polymers contained in the slag slurry complete a thermal decomposition process in the catalytic cracking area 1d, the upper part of the catalytic cracking area 1d is communicated with a secondary pyrolysis area 1f, the gaseous substances generated by the thermal decomposition enter the secondary pyrolysis area 1f, further decomposition is carried out, a secondary gas phase recovery pipe 13 is installed at the top of the secondary pyrolysis zone 1f, the secondary gas phase recovery pipe 13 is communicated with the middle part of the primary gas phase recovery pipe 12, and gaseous substances generated in the catalytic cracking zone 1d and the secondary pyrolysis zone 1f enter the primary gas phase recovery pipe 12 through the secondary gas phase recovery pipe 13 and finally enter the primary condenser 3; a solid slag tank 2 is arranged below the catalytic cracking area 1d, the catalytic cracking area 1d is communicated with the solid slag tank 2, waste slag in the catalytic cracking area 1d finally falls into the solid slag tank 2, a discharge hole is arranged at the bottom of the solid slag tank 2, a nitrogen adjusting pipe 17 is arranged at the top of the solid slag tank 2, the nitrogen adjusting pipe 17 is connected with a nitrogen gas source, the pressure in the solid slag tank 2 can be increased by injecting nitrogen into the solid slag tank 2, the cleaning and the discharge of the waste slag are facilitated, a third-stage gas phase recovery pipe 14 is arranged at the top of the solid slag tank 2, the third-stage gas phase recovery pipe 14 is communicated with a secondary pyrolysis area 1f, a small amount of gaseous substances generated by the waste slag in the solid slag tank 2 enter the secondary pyrolysis area 1f and finally converge into a primary gas phase recovery pipe 12 to enter a primary condenser 3, the gaseous substances are primarily condensed by using the primary condenser 3, the lower end of the primary condenser 3 is communicated with the recovery tank 4, gaseous state material gets into in retrieving jar 4 through the gas-liquid mixture that forms behind the 3 condensation of one-level condenser, the top of retrieving jar 4 is equipped with second grade condenser 5, retrieve jar 4 and second grade condenser 5 intercommunication, gaseous state material in retrieving jar 4 gets into second grade condenser 5, blast pipe 15 is installed on the top of second grade condenser 5, the liquid material who forms after the condensation of second grade condenser 5 flows into again in retrieving jar 4, light component by the condensation among the gaseous state material is discharged through blast pipe 15, fluid-discharge tube 16 is installed to the bottom of retrieving jar 4, the liquid material in retrieving jar 4 passes through fluid-discharge tube 16 and discharges.
Example 2
In the embodiment of the invention, a method for recycling and harmlessly treating industrial hazardous waste comprises the following steps:
(1) injecting the slag slurry to be treated into a drying and pyrolysis integrated machine 1, introducing steam into a primary drying area 1a, performing primary drying and evaporation on the slag slurry, controlling the temperature in the primary drying area 1a to be 80-200 ℃, enabling gaseous substances in the primary drying area 1a to enter a primary condenser 3, cooling the primary condenser 3 by circulating water, enabling the slag slurry treated by the primary drying area 1a to enter a secondary heating area 1b for further heating, enabling the gaseous substances generated in the secondary heating area 1b to also enter the primary condenser 3 through a primary gas phase recovery pipe 12, enabling the slag slurry in the secondary heating area 1b to enter a horizontal conveying area 1c, enabling the slag slurry in the horizontal conveying area 1c to enter a catalytic pyrolysis area 1d, completing a thermal decomposition process of heavy components and polymers contained in the slag slurry in the catalytic pyrolysis area 1d, and enabling the gaseous substances generated by thermal decomposition to enter a secondary pyrolysis area 1f, further decomposition is carried out, and gaseous substances generated in the catalytic cracking zone 1d and the secondary pyrolysis zone 1f enter the primary gas-phase recovery pipe 12 through the secondary gas-phase recovery pipe 13 and finally enter the primary condenser 3; the waste residue in the catalytic cracking zone 1d finally falls into a solid residue tank 2;
(2) injecting nitrogen into the solid slag tank 2, increasing the pressure in the solid slag tank 2, and discharging waste slag in the solid slag tank 2;
(3) gaseous substances generated by waste residues in the drying and pyrolysis integrated machine 1 enter the primary condenser 3 through a pipeline, the primary condenser 3 is used for preliminarily condensing the gaseous substances, a gas-liquid mixture formed by condensing the gaseous substances through the primary condenser 3 enters the recovery tank 4, the gaseous substances in the recovery tank 4 enter the secondary condenser 5, and liquid substances formed by condensing the gaseous substances through the secondary condenser 5 flow into the recovery tank 4 again;
(4) the light components in the gaseous substance that have not been condensed are discharged through the gas discharge pipe 15, and the liquid substance in the recovery tank 4 is discharged through the liquid discharge pipe 16.
Example 3
Taking the slurry of a polysilicon factory as an example, the solid phase component in the slurry is unreacted silicon powder and metal impurities such as iron, aluminum, calcium and the like. The liquid phase components comprise materials such as trichlorosilane, silicon tetrachloride, polysilane, metal chloride and the like. Conveying the slag slurry to a drying and pyrolysis integrated machine 1 through a slag slurry feeding pipe 11, introducing steam into a primary drying area 1a through a steam input pipe 18, primarily heating to 80-200 ℃, gasifying most trichlorosilane in the slag slurry after primary heating, entering a primary condenser 3 through a primary gas phase recovery pipe 12 for condensation, further heating the slag slurry in a secondary heating area 1b, evaporating a small amount of trichlorosilane and silicon tetrachloride, discharging the evaporated trichlorosilane and silicon tetrachloride through a primary gas phase recovery pipe 12, feeding the unevaporated waste slag into a horizontal conveying area 1c, feeding the slag slurry into a catalytic cracking area 1d under the pushing of the horizontal conveying area 1c, basically completing the thermal decomposition process of polysilane in the catalytic cracking area 1d, feeding the decomposed gas phase into a secondary pyrolysis area 1f, completely decomposing the undecomposed polymer, and converging the decomposed polymer into the primary gas phase recovery pipe 12 through a secondary gas phase recovery pipe 13, and then the solid slag enters a first-stage condenser 3, solid slag enters a solid slag tank 2, the solid slag tank is cleaned and discharged regularly, nitrogen is introduced into the solid slag tank 2 through a nitrogen adjusting pipe 17, certain pressure can be applied to the solid slag tank 2, solid slag discharge is facilitated, gas in the solid slag tank 2 is converged into a primary gas-phase recovery pipe 12 through a third-stage gas-phase recovery pipe 14, then the gas enters the first-stage condenser 3 for condensation, a refrigerant of the first-stage condenser is circulating water, the temperature of a gas-liquid mixture after condensation is 30-80 ℃, the gas-liquid mixture enters a recovery tank 4, the gas phase is condensed through a second-stage condenser 5 from the top, trichlorosilane with light components is discharged from an exhaust pipe 15, silicon tetrachloride in the recovery tank 4 is discharged through a liquid discharge pipe 16, and a corresponding pipeline pump can be added to the liquid discharge pipe 16 to increase the pressure of the liquid.
It should be particularly noted that the solid slag tank 2, the recovery tank 4, the slurry feeding pipe 11 and the steam input pipe 18 in the application are applications in the prior art, the slurry is subjected to multistage drying pyrolysis, the drying process and the pyrolysis process are combined to form an innovation point of the application, and the problems that the existing industrial slurry is not thoroughly treated and the pollution in the treatment process is large are effectively solved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The utility model provides a useless resourceization of industry danger and innocent treatment device, includes dry pyrolysis all-in-one (1), solid sediment jar (2), recovery tank (4), sediment thick liquid inlet pipe (11) and steam input pipe (18), a serial communication port, dry pyrolysis all-in-one (1) contains five functional partitioning, is preliminary drying district (1a), secondary heating district (1b), horizontal transport district (1c), catalytic cracking district (1d) and secondary pyrolysis district (1f) respectively, and steam input pipe (18) and preliminary drying district (1a) intercommunication still install elementary vapor recovery pipe (12) on preliminary drying district (1a), and the other end of elementary vapor recovery pipe (12) is connected with one-level condenser (3), useless resourceization of industry danger and innocent treatment device's application method, includes following step:
(1) injecting the slag slurry to be treated into a drying and pyrolysis integrated machine, enabling the slag slurry to enter a primary drying area, enabling the temperature in the primary drying area to be 80-200 ℃, introducing steam, carrying out primary drying evaporation on the slag slurry, enabling gaseous substances in the primary drying area to enter a primary condenser, adopting circulating water cooling for the primary condenser, enabling the slag slurry treated by the primary drying area to enter a secondary heating area for further heating, enabling the gaseous substances generated in the secondary heating area to also enter the primary condenser through a primary gas phase recovery pipe, enabling the slag slurry in the secondary heating area to enter a horizontal conveying area, enabling the slag slurry in the horizontal conveying area to enter a catalytic cracking area, enabling heavy components and polymers contained in the slag slurry to complete a thermal decomposition process in the catalytic cracking area, enabling the gaseous substances generated by the thermal decomposition to enter the secondary pyrolysis area for further decomposition, enabling the gaseous substances generated in the catalytic cracking area and the secondary pyrolysis area to enter the primary gas phase recovery pipe through a secondary gas phase recovery pipe, finally entering a first-stage condenser; the waste residue in the catalytic cracking area finally falls into a solid residue tank;
(2) injecting nitrogen into the solid slag tank, increasing the pressure in the solid slag tank, and discharging the waste slag in the solid slag tank;
(3) gaseous substances generated by waste residues in the drying and pyrolysis integrated machine enter a primary condenser through a pipeline, the primary condenser is used for preliminarily condensing the gaseous substances, a gas-liquid mixture formed by condensing the gaseous substances through the primary condenser enters a recovery tank, the gaseous substances in the recovery tank enter a secondary condenser, and liquid substances formed by condensing the gaseous substances through the secondary condenser flow into the recovery tank again;
(4) the light components which are not condensed in the gaseous substances are discharged through the exhaust pipe, and the liquid substances in the recovery tank are discharged through the liquid discharge pipe.
2. The device for recycling and harmless treatment of industrial hazardous wastes according to claim 1, wherein a solid slag tank (2) is arranged below the catalytic cracking zone (1d), the catalytic cracking zone (1d) is communicated with the solid slag tank (2), a three-stage gas phase recovery pipe (14) is installed at the top of the solid slag tank (2), the three-stage gas phase recovery pipe (14) is communicated with the secondary pyrolysis zone (1f), the lower end of the primary condenser (3) is communicated with the recovery tank (4), a secondary condenser (5) is arranged above the recovery tank (4), the recovery tank (4) is communicated with the secondary condenser (5), and gaseous substances in the recovery tank (4) enter the secondary condenser (5).
3. A resource and harmless treatment apparatus for industrial hazardous waste according to claim 1, wherein a secondary gas phase recovery pipe (13) is installed at the top of the secondary pyrolysis zone (1f), and the secondary gas phase recovery pipe (13) is communicated with the middle part of the primary gas phase recovery pipe (12).
4. A resource and harmless treatment device for industrial hazardous waste according to claim 2, characterized in that a discharge outlet is arranged at the bottom of the solid slag tank (2), a nitrogen adjusting pipe (17) is arranged at the top of the solid slag tank (2), and the nitrogen adjusting pipe (17) is connected with a nitrogen source.
5. A device for the recycling and harmless treatment of industrial hazardous waste according to claim 2, characterized in that the bottom of the recovery tank (4) is equipped with a drain pipe (16).
6. A device for the recycling and harmless treatment of industrial hazardous waste according to claim 2, characterized in that the top end of the secondary condenser (5) is provided with an exhaust pipe (15).
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| CN109897058A (en) * | 2019-02-28 | 2019-06-18 | 天津大学 | A kind of organic silicon slurry slag processing system and treatment process |
| CN110950342A (en) * | 2019-11-29 | 2020-04-03 | 天华化工机械及自动化研究设计院有限公司 | Polysilicon slag slurry non-hydration treatment process |
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