NL2032126B1

NL2032126B1 - High-temperature oxidation device for high-salt dangerous waste

Info

Publication number: NL2032126B1
Application number: NL2032126A
Authority: NL
Inventors: Yuan Wenjiao; Fan Wenhao; Zhang Ke; Li Meitong
Original assignee: Univ Tianjin Technology; Yi Keli Tianjin Environmental Protection Tech Development Co Ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2023-12-18

Abstract

A high-temperature oxidation device for high-salt dangerous waste consists of an oxidation furnace body, a hot air inlet, an air distribution plate, a solid feeder, a material 5 distributor, a classiﬁer, a cyclone separator, an energy-saving heat exchanger, a return feeder, a bag ﬁlter, a wet ﬁlter and a sealing discharger. The beneﬁcial effects of the present disclosure is that the device can completely decompose the organic matter in the solid waste without melting. The device controls the oxidation time of the material by adjusting the wind speed, feed particle size, wind pressure and return material to ensure 10 the complete decomposition of the organic matter. The device has the advantages of high efﬁciency, simple process, controllable high-temperature oxidative decomposition of organic matter, high thermal energy utilization rate, low operating cost, and easy implementation, and has wide application prospects with signiﬁcant economic and social beneﬁts.

Description

HIGH-TEMPERATURE OXIDATION DEVICE FOR HIGH-SALT

DANGEROUS WASTE

TECHNICAL FIELD

[0001] The present disclosure relates to a high-temperature oxidation device for high- salt dangerous waste, which belongs to resource environmental protection equipment.

BACKGROUND ART

[0002] China produces about 50 million tons of dangerous solid waste every year, of which more than 20% are inorganic salts containing organic substances. Since the existing dangerous waste incinerators are not suitable for dangerous waste containing inorganic salts, of the inorganic salts can melt or decompose at high temperatures, leaving the existing dangerous waste incinerators are not suitable for dangerous waste containing inorganic salts. A large amount of waste salt at home and abroad cannot be approperly treated, which has caused many environmental protection accidents and severe ecological and environmental burdens, and has seriously restricted the healthy development of the economy.

[0003] The existing treatment of dangerous solid waste salt is mainly landfill, which occupies a large amount of land, has high cost, has potential risks, and leaves pollution to future generations.

[0004] Inorganic salts in dangerous solid waste salts are valuable mineral resources and have a high value. The development of a device that can recycle dangerous waste salts at low cost has substantial economic value and social benefits.

SUMMARY

[0005] The present disclosure aims to provide a high-salt dangerous waste high- temperature oxidation device for the existing problems in the disposal of dangerous solid waste salts. The device effectively decomposes organic matter in inorganic salts by controlling the oxidation time below the melting temperature of inorganic salts, and turns dangerous waste into usable resources. The device is low cost, is efficient and is suitable for resource processing of various high-salt dangerous solid or liquid wastes.

[0006] Technical solution of the present disclosure.

[0007] A high-temperature oxidation device for high-salt dangerous waste, consisting of an oxidation furnace body, a hot air inlet, an air distribution plate, a solid feeder, a material distributor, a classifier, a cyclone separator, an energy-saving heat exchanger, a return feeder, a bag filter, a wet filter and a sealing discharger, wherein the oxidation furnace body is a vertical cylinder structure, the diameter of the cylinder structure is of any size, and is a straight cylinder or a cylinder of unequal width, the height-diameter ratios 1: (0.1-1), and an outer wall and lining material of the furnace body are made of high temperature resistant materials; the oxidation furnace body has a solid discharge port and is connected with a sealing discharger, and the sealing discharger is a spiral sealing structure to prevent the system from leaking; the oxidation furnace body has a hot air inlet at the bottom, a material inlet in the middle, and a hot air outlet at the top; the hot air inlet is provided with an adjustable valve to adjust the hot air temperature, and the inlet air temperature is 400-1400 °C; the air distribution plate is a spiral structure or a absorbent structure to distribute the hot air and increase the wind speed to prevent the solid objects from falling, the hole diameter of the absorbent structure is 2-300mm, and the hole spacing is 0.5-15mm; the solid feeder is a screw conveyor; the material distributor is an orifice plate, a pipe or a nozzle structure to allow solid or liquid materials to be fed. The material dispersion diameter is 0.001-10mm. The material distributor 1s set at any position in the cylinder, and the material and the hot air are co-current or counter-current; the classifier is an orifice plate structure or a mesh structure to block the passage of particles, and the hole diameter is 0.5-200mm; the cyclone separators are one or more in parallel or in series to capture particulate matter; the energy-saving heat exchanger is a device using the heat of the exhaust gas, and uses cold air to cool the exhaust gas, and the exchanged hot air is used for the combustion of the hot blast stove or for heating in other suitable environments; the return feeder 9 is a spiral or straight cylinder structure to return the material to the oxidation furnace to continue heating; the bag filter and wet filter are used to exhaust gas treatment; the hot gas outlet of the oxidation furnace body is connected to the inlet and outlet of the cyclone separator, the inlet and outlet of the energy-saving heat exchanger, the inlet and outlet of the bag filter, and the inlet and outlet of the wet filter through the pipeline in turn, and finally the exhaust gas is emptied; the solids separated by the cyclone separator are collected into the solid feeder through the return feeder and enter the oxidation furnace body through the material inlet.

[0008] The beneficial effects of the present disclosure are as follows.

[0009] The device can completely decompose the organic matter in the solid waste without melting. The device controls the oxidation time of the material by adjusting the wind speed, feed particle size, wind pressure and return material to ensure the complete decomposition of the organic matter. The device has a high efficiency, a simple process, a controllable high-temperature oxidative decomposition of organic matter, a high thermal energy utilization rate, a low operating cost, and an easy implementation, and has broad application prospects with significant economic and social benefits.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic structural diagram of a device according to the present disclosure.

[0011] The reference numbers in the drawings are as follows: 1. oxidation furnace body, 2. hot air inlet, 3. air distribution plate, 4. solid feeder, 5. material distributor, 6. classifier, 7. cyclone separator, 8. energy-saving heat exchanger, 9. return feeder, 10. bag filter, 11. wet filter, 12. sealing discharger.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The following non-limiting embodiments are used to illustrate the present disclosure.

[0013] Embodiment

[0014] A high-temperature oxidation device for high-salt dangerous waste, as shown in

FIG. 1, consists of an oxidation furnace body 1, a hot air inlet 2, an air distribution plate 3, a solid feeder 4, a material distributor 5, a classifier 6, a cyclone separator 7, an energy- saving heat exchanger 8, a return feeder 9, a bag filter 10, a wet filter 11 and a sealing discharger 12.

[0015] The oxidation furnace body 1 is a vertical cylinder structure. The diameter of the cylinder structure is of any size, and is a straight cylinder or a cylinder of unequal width, the height-diameter ratio is 1: (0.1-1), and an outer wall and the lining material of the furnace body are made of high temperature resistant materials. The oxidation furnace body 1 has a solid discharge port and is connected with a sealing discharger 12, and the sealing discharger 12 is a spiral sealing structure to prevent the system from leaking. The oxidation furnace body 1 has a hot air inlet at the bottom, a material inlet in the middle, and a hot air outlet at the top.

[0016] The hot air inlet 2 is provided with an adjustable valve to adjust the hot air temperature, and the inlet air temperature is 400-1400 °C.

[0017] The air distribution plate 3 is a spiral structure or a absorbent structure to distribute the hot air and increase the wind speed to prevent the solid objects from falling.

The hole diameter of the absorbent structure is 20mm, and the hole spacing is 2mm.

[0018] The solid feeder 4 is a screw conveyor.

[0019] The material distributor 5 is an orifice plate, a pipe or a nozzle structure to allow solid or liquid materials to enter. The material dispersion diameter is 0.001-10mm. The material distributor 5 is set at any position in the cylinder, and the material and the hot air are co-current or counter-current.

[0020] The classifier 6 is an orifice plate structure or a mesh structure to block the passage of particles, and the hole diameter is 0.5-200mm.

[0021] The cyclone separators 7 are two in parallel for capturing particulate matter.

[0022] The energy-saving heat exchanger 8 is a device using the heat of the exhaust gas, and uses cold air to cool the exhaust gas, and the exchanged hot air is used for the combustion of the hot blast stove or heating in other suitable environments.

[0023] The return feeder 9 is a spiral or straight cylinder structure to return the material to the oxidation furnace to continue heating.

[0024] The bag filter 10 and wet filter 11 are used to exhaust gas treatment.

[0025] The hot gas outlet of the oxidation furnace body is connected to the inlet and outlet of the cyclone separator 7, the inlet and outlet of the energy-saving heat exchanger 8, the inlet and outlet of the bag filter 10 and the inlet and outlet of the wet filter 11 through the pipeline in turn, and finally the exhaust gas is emptied.

[0026] The solids separated by the cyclone separator 7 are collected into the solid feeder 4 through the return feeder 9 and enter the oxidation furnace body 1 through the material inlet.

[0027] In this embodiment, the oxidation furnace body 1 is made of 310s heat-resistant stainless steel, and the structure is an unequal diameter cylinder. The maximum diameter of an upper portion is 1000mm, and the minimum diameter of a lower portion is 200mm, and a middle portion is designed with the sealing discharger 12, and the sealing discharger is of screw conveying structure. The lower portion of the cylinder has an air inlet 2, and the air inlet temperature 1s 800°C. An upper portion of the air inlet 2 is the air distribution plate 3, and the air distribution plate 3 is a spiral guide plate, and the rotation angle is 15° in a clockwise direction. The hole diameter of the material distributor 5 on the upper portion of the air distribution board is 2mm, and the upper portion of the material distributor 5 is fixed with the solid feeder 4. The solid feeder 4 is the screw conveyor. The top of the material distributor 5 is the classifier 6, and the hole diameter of the classifier is 2mm; the back of the classifier 6 is connected to the cyclone separator 7. The discharge port under the cyclone separator 7 is used to connect the return feeder 9, and the tail gas of the air outlet is connected to the inlet of the energy- saving heat exchanger 8. The outlet of the energy-saving heat exchanger 8 is connected tothe inlet of the bag filter 10; the gas outlet of the bag filter 10 is connected to the inlet of the wet filter 11, and the dedusted gas is discharged up to the standard by the damp filter.

[0028] The material is transported to the top of the material distributor 5 by the solid feeder 4, and the solid with a particle size larger than 2mm is transported out of the oxidation furnace through the sealing discharger as a finished product. Solid particles with a particle size less than 2mm are collected from the cyclone separator 7 and the bag filter 8 through the classifier 6, as the finished product or returned to the oxidation furnace 1.

[0029] In summary, due to the use of the technical solutions mentioned above, the organic matter in the high-salt and high-organic waste can be fully decomposed. A reliable device for the disposal of high-salt waste is provided. The device makes full use of energy consumption, is simple to operate, cost low operating cost, and is suitable for the disposal of various high-salt wastes. The present embodiment should not constitute a limitation to the present disclosure. According to the technical essence of the present disclosure, any simple modifications, equivalent changes and modifications made to the embodiments fall within the technical protection scope of the present disclosure.

Claims

Conclusions

1. High temperature oxidation device for high salinity hazardous waste, which consists of an oxidation furnace body, a hot air inlet, an air distribution plate, a fixed feeding device, a material distributor, a classification means, a cyclone separator, an energy saving heat exchanger, a return feeding device, a bag filter, a wet filter and a sealing discharge device, wherein the oxidation furnace body is a vertical cylinder structure, wherein the diameter of the cylinder is a straight cylinder or a cylinder of unequal width of any size, wherein the height-to-diameter ratio is 1:(0.1- 1) and wherein an outer wall and lining material of the furnace body are made of materials resistant to high temperatures, wherein the oxidation furnace body has a solid discharge port and is connected to a sealing discharge device and wherein sealing discharge device is a spiral sealing structure to prevent the system is leaking; wherein the oxidation furnace body has a hot air inlet on the bottom, a material inlet in the middle and a hot air outlet on the top, wherein the hot air inlet is provided with an adjustable valve to adjust the hot air temperature and wherein the inlet air temperature is 400-1400°C; wherein the air distribution plate is a spiral structure or an absorbent structure to distribute the heat air and increase the wind speed to prevent solid objects from falling, wherein the cavity diameter of the absorbent structure is 2-300mm and the cavity spacing is 0.5-15mm ; wherein the solid material supply device is a screw conveyor means; wherein the material distributor is an orifice plate, a conduit or a nozzle structure for feeding solid or liquid materials, wherein the material distribution diameter is 0.001-10mm, wherein the material distributor is set at any position in the cylinder and the material and hot air are conveyed with the to be with or against the current; wherein the classification means is an orifice plate structure or a mesh structure to block the passage of particles and wherein the cavity diameter is 0.5-200mm; wherein the cyclone separators are one or more in parallel or in series to capture particulate matter; wherein the energy-saving heat exchanger is a device that uses heat from the exhaust gas and uses cold air to cool the exhaust gas and wherein the exchanged warm air is used for the combustion of the hot air heater or for heating in other suitable environments; wherein the return feed device is a spiral or straight cylinder structure for returning the material to the oxidation furnace to continue heating; wherein the bag filter and wet filter are used to emit gas treatment; wherein the hot gas outlet of the oxidation furnace body is connected to the inlet and outlet of the cyclone separator, the inlet and outlet of the energy saving heat exchanger, the inlet and outlet of the bag filter and the inlet and outlet of the wet filter through the pipeline in bend and finally the exhaust gas is discharged; wherein the solids separated by the cyclone separator are collected in the solid feeding device through the return feeding device and enter the oxidation furnace body through the material inlet.