CN218134016U - Stainless steel pickling filter residue processing system - Google Patents
Stainless steel pickling filter residue processing system Download PDFInfo
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- CN218134016U CN218134016U CN202222472647.7U CN202222472647U CN218134016U CN 218134016 U CN218134016 U CN 218134016U CN 202222472647 U CN202222472647 U CN 202222472647U CN 218134016 U CN218134016 U CN 218134016U
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Abstract
The utility model provides a stainless steel pickling filter residue processing system, including gas heating device, filter residue feed arrangement, suspension high temperature reaction tower, dust collector and flue gas processing apparatus. The system can decompose fluoride and ammonia nitrogen in filter residues to form hydrogen fluoride and nitrogen, and the hydrogen fluoride can be absorbed and recycled to be used for pickling required hydrofluoric acid, so that green circular economy is realized; the system can also decompose metal salts in the filter residue into metal oxides which are used as raw materials for stainless steel smelting, so that the comprehensive utilization of the filter residue is realized.
Description
Technical Field
The utility model belongs to the environmental protection field, in particular to stainless steel pickling filter residue processing system.
Background
A large amount of wastewater is generated by stainless steel acid washing, a certain amount of sludge is generated after reclaimed water is treated by water, and filter residue is finally formed by a filter pressing system; the filter residue mainly comprises metal nitrate or fluoride salt which is obtained by pickling stainless steel material, soil and dust which are adhered to part of the surface, and the like. The filter residue is mainly soluble salt with high metal content, and the harmful elements mainly comprise heavy metals of nickel, chromium, manganese, fluorine and ammonia nitrogen. At present, the main final treatment method is used for directly burying hazardous wastes, and measures such as chelation curing and the like are adopted to meet the landfill standard; the metal and fluoride in the filter residue are not recycled, which causes great resource waste.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a stainless steel pickling filter residue treatment system, which can decompose fluoride and ammonia nitrogen in filter residue to form hydrogen fluoride and nitrogen, wherein the hydrogen fluoride can absorb and recover hydrofluoric acid required by pickling, thereby realizing green circular economy; the system can also decompose metal salts in the filter residue into metal oxides which are used as raw materials for stainless steel smelting, so that the comprehensive utilization of the filter residue is realized.
The utility model provides a stainless steel pickling filter residue processing system, includes gas heating device, filter residue feed arrangement, suspension high temperature reaction tower, dust collector and flue gas processing apparatus, and gas heating device, suspension high temperature reaction tower, dust collector and flue gas processing apparatus connect gradually, and filter residue feed arrangement sets up in one side of suspension high temperature reaction tower to communicate with suspension high temperature reaction tower.
The utility model provides a stainless steel pickling filter residue processing system's work flow does: the gas heating device heats normal temperature gas into high temperature gas, the high temperature gas enters the suspension high temperature reaction tower, the feeding device sends filter residues into the suspension high temperature reaction tower, the high temperature gas blows filter residue materials, the filter residue materials form a suspension state, water in the filter residues is evaporated, nitrate in the filter residues is thoroughly decomposed, fluoride in the filter residues is converted into hydrogen fluoride, and metal salts in the filter residues are decomposed into metal oxides. The ash generated after decomposition contains metal oxide, a small part of ash is discharged and collected from an ash discharge pipeline at the bottom of the suspension high-temperature reaction tower, the flue gas containing water vapor coming out from the top end of the suspension high-temperature reaction tower is firstly subjected to preliminary dust removal by a dust remover, and the flue gas after dust removal is treated by a flue gas treatment device and then reaches the discharge standard for discharge.
Further to the above technical solution, the gas heating device includes a plasma heating system and a temperature-adjusting gas inlet device.
The plasma system can provide 3000-5000 ℃ high-temperature flame flow, the high-temperature flame flow and the temperature-adjusting gas coming from the temperature-adjusting gas inlet device are in contact heat exchange in a heating pipeline of the heating device, 800-1200 ℃ high-temperature gas can be formed, and fluoride in filter residues can be effectively treated at the high temperature. The temperature of the high temperature flame stream produced is regulated by adjusting the power of the plasma heating system.
Further, the gas inlet pipe of the temperature-adjusting gas inlet device is connected to the heating pipe of the gas heating device in an inclined manner.
The temperature-adjusting gas obliquely enters the heating pipeline, so that the mixing of high-temperature gas flow and temperature-adjusting gas flow can be accelerated, the length of the pipeline in a mixing area is shortened, and the cost of the heating pipeline is reduced.
Preferably, the included angle between the air inlet pipeline and the heating pipeline is 30-45 degrees.
Further describing the technical scheme, the gas temperature of the gas inlet of the suspension high-temperature reaction tower is 1000-1100 ℃, and the flue gas temperature of the outlet is 450-550 ℃.
The fluoride in the filter residue can be efficiently treated at the high temperature of more than 1000 ℃.
Further describing the technical scheme, the feeding pipe of the filter residue feeding device, which is connected with the suspension high-temperature reaction tower, is vertical to the suspension high-temperature reaction tower. Preferably, the filter residue feeding device adopts a spiral feeding device with a material seal, so that the amount of the materials entering the reaction tower can be conveniently controlled.
Further describing the technical scheme, the material ratio of the gas to the filter residue in the suspension high-temperature reaction tower is every NM 3 0.3-1.0kg of filter residue in the high-temperature gas, wherein the specific proportion is determined according to the water content and the nitrate content in the filter residue.
In the above technical solution, the suspension high temperature reaction tower controls the gas rising speed through the high temperature gas rectifying ring.
Further describing the technical scheme, the flow velocity of the gas-solid two-phase flow in the suspension high-temperature reaction tower is 25-40m/s.
Further to the above technical solution, the dust remover is a cyclone dust remover.
Further describing the technical scheme, the flue gas treatment device comprises a hydrogen fluoride absorption tower, a heat exchanger, a low-temperature SCR denitration device and a bag-type dust remover. The flue gas containing water vapor after passing through the dust remover firstly absorbs water vapor and hydrogen fluoride through a hydrogen fluoride absorption tower, then is reheated to 200-300 ℃ through a heat exchanger, then is denitrated through a low-temperature SCR denitration device, and finally is discharged through a bag-type dust remover.
The novel beneficial effect of this use is:
(1) The stainless steel acid pickling filter residue treatment system is used for performing high-temperature treatment on filter residues in a suspension high-temperature reaction tower, decomposing fluoride and ammonia nitrogen to form hydrogen fluoride and nitrogen, and preparing hydrofluoric acid through a hydrogen fluoride absorption tower, so that the hydrofluoric acid required by acid pickling can be used, and the aim of green circular economy of a factory is fulfilled; metal salts are decomposed at high temperature to generate metal oxides, and the metal oxides of the main components of the stainless steel with higher purity, such as nickel, chromium, manganese and other elements, are recovered and used as raw materials for smelting the stainless steel, so that the comprehensive utilization of acid washing filter residues is realized, and the method has high economic value.
(2) The processing system is highly scalable. The water content difference of filter residues finally generated by different pickling wastewater treatment processes is large, meanwhile, the proportion of nitrate and fluoride in the filter residues generated after different stainless steel pickling processes is also large, and the difference of heat generated by nitrate decomposition and heat absorbed by water evaporation is also large.
(3) Compared with the existing stainless steel acid washing filter residue treatment device, the system is simple in process and short in process route, and filter residues can fully react through the suspension high-temperature reaction tower.
Drawings
FIG. 1 is a flowchart of example 1;
FIG. 2 is a schematic view of a system according to embodiment 1;
wherein: 1-a plasma generator, 2-a temperature-adjusting gas inlet pipeline, 3-a heating pipeline, 4-a feeding pipe, 5-a suspension high-temperature reaction tower, 6-an ash discharge pipe of the suspension high-temperature reaction tower, 7-a flue gas outlet, 8-a cyclone dust collector and 9-an ash residue outlet.
Detailed Description
The present invention will be further described with reference to the following specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
The system for treating the steel acid washing and residue filtering of the embodiment shown in figure 1 comprises a gas heating device, a residue feeding device, a suspension high-temperature reaction tower, a dust removal device and a flue gas treatment device. The gas heating device comprises a plasma generator 1, a temperature adjusting gas inlet pipeline 2 and a heating pipeline 3, wherein the temperature adjusting gas inlet pipeline 2 and the heating pipeline 3 form an included angle of 30 degrees, the temperature adjusting gas inlet direction and the plasma high-temperature flame flow are in the reverse direction, and the temperature adjusting gas can be nitrogen or air. The tail part of the heating pipeline 3 is connected with a suspension high-temperature reaction tower 5. The filter residue feeding device comprises a screw feeder with a material seal and a feeding pipe (not shown in figure 1), the feeding pipe is connected with the screw feeder and the suspension high-temperature reaction tower 5, acid washing filter residue is fed into the suspension high-temperature reaction tower 5 through the screw feeder, and the feeding pipe 4 is perpendicular to the suspension high-temperature reaction tower 5 and is close to one end connected with the heating pipeline 3. The suspension high temperature reaction tower 5 is also provided with an ash discharge pipe 6, and the heavier particles of the ash generated in the reaction tower 5 are discharged through the ash discharge pipe 6 under the action of gravity, and the part is only a small amount of ash. The top outlet of the suspension high-temperature reaction tower 5 is connected with a cyclone dust collector 8, and the cyclone dust collector 8 separates and collects most of ash slag in the flue gas coming out of the suspension high-temperature reaction tower 5 and discharges the ash slag from an ash slag outlet 9 at the bottom of the dust collector. The flue gas containing water vapor after cyclone dust removal enters the flue gas treatment device through a flue gas outlet 7. The hydrogen fluoride absorption tower, the heat exchanger, the low-temperature SCR denitration device and the bag-type dust remover in the flue gas treatment device are all existing equipment and are not shown in figure 1. The flue gas firstly absorbs water vapor and hydrogen fluoride through a hydrogen fluoride absorption tower, then is reheated to 200-300 ℃ through a heat exchanger, then is denitrated through a low-temperature SCR denitration device, and finally is discharged through a bag-type dust collector.
A specific working condition shown in this embodiment is as follows: the water content of the stainless steel pickling filter residue is 24%, the iron content is 23%, the chromium content is 2%, the nickel content is 2%, the fluorine content is 15%, the balance is nitrate radical, the treatment capacity is 100kg/h, the plasma matching power is 110kWe, the ventilation capacity of a plasma carrier gas is 60Nm & lt 3 & gt/h, the plasma temperature is 3500 ℃, a temperature regulating gas is introduced through a high-pressure fan, the ventilation capacity of the temperature regulating gas is 170Nm & lt 3 & gt/h, the temperature of a mixed gas, namely a high-temperature gas, is 1000 ℃, the flow rate of a gas-solid two-phase flow in a suspension high-temperature reaction tower is controlled to be 30m/s, the high-temperature reaction time is 2s, and the exhaust gas temperature is 500 ℃. The comprehensive power consumption is about 1.1kWh per kilogram of filter residue, and the comprehensive powder concentration is 0.44kg (filter residue)/Nm 3 (high-temperature gas).
It is obvious that the above are only some embodiments of the present invention, and are not used for limiting the present invention, and for those skilled in the art, the present invention can have the combination and modification of the above various technical features, and those skilled in the art can replace the modifications, equivalents, or use the structure or method of the present invention in other fields to achieve the same effect without departing from the spirit and scope of the present invention, and all belong to the protection scope of the present invention.
Claims (10)
1. The utility model provides a stainless steel pickling filter residue processing system which characterized in that: the device comprises a gas heating device, a filter residue feeding device, a suspension high-temperature reaction tower, a dust removal device and a flue gas treatment device, wherein the gas heating device, the suspension high-temperature reaction tower, the dust removal device and the flue gas treatment device are sequentially connected, and the filter residue feeding device is arranged on one side of the suspension high-temperature reaction tower and communicated with the suspension high-temperature reaction tower.
2. The stainless steel pickling filter residue processing system of claim 1, wherein: the gas heating device comprises a plasma heating system and a temperature-adjusting gas inlet device.
3. The stainless steel pickling filter residue processing system of claim 2, wherein: and the air inlet pipeline of the temperature-adjusting air inlet device is obliquely connected with the heating pipeline of the air heating device.
4. The stainless steel pickling filter residue processing system of claim 3, wherein: the included angle between the air inlet pipeline and the heating pipeline is 30-45 degrees.
5. The stainless steel pickling filter residue processing system of claim 1, wherein: the gas temperature of the gas inlet of the suspension high-temperature reaction tower is 1000-1100 ℃, and the gas temperature of the gas outlet is 450-550 ℃.
6. The stainless steel pickling residue treatment system of claim 1, wherein: and the filter residue feeding device is vertical to the suspension high-temperature reaction tower through a feeding pipe connected with the suspension high-temperature reaction tower.
7. The stainless steel pickling residue treatment system of claim 1, wherein: the material ratio of gas to filter residue in the suspension high-temperature reaction tower is every NM 3 0.3-1.0kg of filter residue in the high temperature gas.
8. The stainless steel pickling filter residue processing system of claim 1, wherein: the suspension high-temperature reaction tower controls the rising speed of gas through a high-temperature gas rectifying ring.
9. The stainless steel pickling filter residue processing system of claim 8, wherein: the flow velocity of the gas-solid two-phase flow in the suspension high-temperature reaction tower is 25-40m/s.
10. The stainless steel pickling filter residue processing system of claim 1, wherein: the flue gas treatment device comprises a hydrogen fluoride absorption tower, a heat exchanger, a low-temperature SCR denitration device and a bag-type dust remover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222472647.7U CN218134016U (en) | 2022-09-19 | 2022-09-19 | Stainless steel pickling filter residue processing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222472647.7U CN218134016U (en) | 2022-09-19 | 2022-09-19 | Stainless steel pickling filter residue processing system |
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| CN218134016U true CN218134016U (en) | 2022-12-27 |
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| CN202222472647.7U Active CN218134016U (en) | 2022-09-19 | 2022-09-19 | Stainless steel pickling filter residue processing system |
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