CN212504546U - Zero-emission recycling treatment device for pickling process waste - Google Patents
Zero-emission recycling treatment device for pickling process waste Download PDFInfo
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- CN212504546U CN212504546U CN202021014512.0U CN202021014512U CN212504546U CN 212504546 U CN212504546 U CN 212504546U CN 202021014512 U CN202021014512 U CN 202021014512U CN 212504546 U CN212504546 U CN 212504546U
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Abstract
The utility model relates to a zero-emission recycling treatment device for pickling process waste, which comprises a pickling line, a sludge evaporator, a grinder, a rinsing water concentrator, a solid-liquid mixer, a roasting reactor, an acid absorber and a denitration reactor; an acid sludge outlet of the pickling line is sequentially connected with a sludge evaporator, a grinder and a solid-liquid mixer through material pipelines; a waste rinsing water outlet of the pickling line is communicated with a rinsing water concentrator, and a concentrated rinsing water outlet of the rinsing water concentrator is communicated with a solid-liquid mixer; the waste acid outlet of the pickling line and the material outlet of the solid-liquid mixer are both communicated with the material inlet of the roasting reactor; the tail gas outlet of the pickling line and the tail gas outlet of the roasting reactor are both communicated with an acid absorber, and the tail gas outlet of the acid absorber is sequentially connected with a denitration reactor and a sludge evaporator through a gas transmission pipeline. The utility model discloses carry out complete resource recovery and realize the zero release with the solid useless of acidity, waste liquid and the waste gas that the pickling line produced, still utilize the waste heat to reduce the energy consumption.
Description
Technical Field
The utility model relates to a resourceful treatment and recycle technical field of pickling waste, concretely relates to pickling technology waste zero release resourceful treatment device.
Background
In the acid pickling process in the metallurgical industry, a large amount of acid liquor is adopted to carry out acid pickling on plates, rods and wires, and the like, a large amount of acid waste gas and acid pickling waste liquid are generated in the process, and simultaneously, a large amount of acid sludge solid waste consisting of substrate surface iron oxide scales, settled metal acidic compounds and the like is generated. The waste pickle liquor and the acid sludge contain waste acid, heavy metal and the like which are the most important pollutants of metallurgical enterprises and are listed in the list of dangerous waste.
For pickling waste liquid and sludge solid waste, steel enterprises usually adopt lime to neutralize the waste liquid and sludge solid waste to form neutralized sludge precipitates, so that the treatment cost is very high, a larger amount of heavy metal sludge is generated, the environment is greatly influenced, and resources are greatly wasted. Acid mist purification towers are usually arranged for absorbing the acid pickling waste gas, and then lime is used for neutralization after the absorption liquid and other acid pickling waste liquid are gathered.
And partial enterprises filter and press the solid waste of the acid pickling sludge into mud cakes by a filter press, and then intensively convey the mud cakes into a metallurgical smelting system to be used as a treatment means for mixing and adding raw materials, iron ore and the like. However, the acid sludge contains a large amount of acid components, which can cause serious corrosion to smelting equipment, often cause equipment damage and influence production.
Particularly, in the production and preparation process of stainless steel products, nitric acid is often used as a pickling raw material to generate acid waste liquid containing nitric acid and NO with extremely strong corrosivenessxIf the waste gas is not reasonably treated, the environment is seriously polluted. The denitration reactor that sets up for discharge to reach standard needs to use the heat source in order to satisfy the temperature demand of tail gas denitration, and the denitration reaction is exothermic moreover, and the tail gas if direct discharge then causes this part heat direct loss.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art existence, the utility model aims at providing a pickling technology waste material zero release resourceful processing apparatus, can carry out complete resource recovery and realize the zero release with the solid useless of acidity, waste liquid and the waste gas of pickling unit production simultaneously.
In order to realize the aim, the technical scheme of the utility model is a pickling process waste zero-emission recycling treatment device, which comprises a pickling line, a sludge evaporator, a grinder, a rinsing water concentrator, a solid-liquid mixer, a roasting reactor, an acid absorber and a denitration reactor; an acid sludge outlet of the acid pickling unit is sequentially connected with the sludge evaporator, the grinder and the solid-liquid mixer through material pipelines; a waste rinsing water outlet of the pickling line is communicated with the rinsing water concentrator, and a concentrated rinsing water outlet of the rinsing water concentrator is communicated with the solid-liquid mixer; the waste acid outlet of the pickling line and the material outlet of the solid-liquid mixer are both communicated with the material inlet of the roasting reactor; and the tail gas outlet of the acid washing unit and the tail gas outlet of the roasting reactor are communicated with the acid absorber, and the tail gas outlet of the acid absorber is sequentially connected with the denitration reactor and the sludge evaporator through a gas transmission pipeline.
Further, a sludge evaporation tail gas outlet of the sludge evaporator is communicated with the acid absorber through a gas transmission pipeline.
Further, a regenerated acid outlet of the acid absorber is communicated with the pickling line.
Further, a regenerated rinse water outlet of the rinse water concentrator is communicated with the pickling line.
Further, a regenerated rinse water outlet of the rinse water concentrator is in communication with the acid absorber.
Further, a heat exchange cooling device is connected in series on the acid absorber.
Further, the rinsing water concentrator is a reverse osmosis membrane device.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the acid pickling process waste zero-emission recycling treatment device provided by the utility model can simultaneously carry out complete resource recovery on acid solid waste, waste liquid and waste gas generated by the acid pickling line so as to realize zero emission;
(2) the utility model converts the metal ions in the solid waste of the pickling sludge and the pickling waste liquid into the complete resource form of metal oxide;
(3) the utility model reduces the temperature of the gas in the acid absorber through the heat exchange cooling device, so that a large amount of moisture in the gas is condensed and enters the absorption liquid to supplement the absorption liquid, the acid absorption can be automatically completed without additional water supplement, and meanwhile, the gas is beneficial to being discharged after reaching the standard;
(4) the acid sludge solid waste is heated and evaporated by using the reaction waste heat of the denitration reactor, so that the energy consumption of the system is reduced;
(5) the utility model discloses an earlier moisture and free acid in the evaporation removes sour mud solid waste, can significantly reduce the corruption to follow-up process equipment such as grinders, grind mud again, and the dry sludge powder through fully grinding more is favorable to disposing the mud and mixes the liquid, easily reacts regeneration in the calcination reactor moreover.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pickling process waste zero-emission recycling treatment device provided by an embodiment of the present invention;
in the figure: 1. the system comprises a pickling line, 2, a sludge evaporator, 3, a grinder, 4, a rinsing water concentrator, 5, a solid-liquid mixer, 6, a roasting reactor, 7, an acid absorber, 8, a denitration reactor, 9 and a heat exchange cooling device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, an embodiment of the utility model provides a pickling process waste zero-emission resource disposal device, including a pickling line 1, a sludge evaporator 2, a grinder 3, a rinse water concentrator 4, a solid-liquid mixer 5, a roasting reactor 6, an acid absorber 7 and a denitration reactor 8; an acid sludge outlet of the acid pickling unit 1 is sequentially connected with a sludge evaporator 2, a grinder 3 and a solid-liquid mixer 5 through material pipelines and is used for feeding dry sludge powder formed by drying and grinding acid sludge discharged by the acid pickling unit 1 into the solid-liquid mixer 5; the waste rinsing water outlet of the pickling line 1 is communicated with a rinsing water concentrator 4, the concentrated rinsing water outlet of the rinsing water concentrator 4 is communicated with a solid-liquid mixer 5, and the concentrated rinsing water outlet is used for supplying concentrated rinsing water obtained by concentrating waste rinsing water discharged by the pickling line 1 into the solid-liquid mixer 5 and mixing the concentrated rinsing water with dry sludge powder supplied into the solid-liquid mixer 5 by a grinder 3 to form sludge mixed liquid; the waste acid outlet of the pickling line 1 and the material outlet of the solid-liquid mixer 5 are both communicated with the material inlet of the roasting reactor 6, and are used for respectively feeding the sludge mixed liquid discharged by the solid-liquid mixer 5 and the waste acid discharged by the pickling line 1 into the roasting reactor 6 for high-temperature pyrohydrolysis reaction to generate acid regeneration tail gas and metal oxide; the tail gas outlet of the pickling line 1 and the tail gas outlet of the roasting reactor 6 are both communicated with an acid absorber 7 and are used for conveying acid regeneration tail gas generated in the roasting reactor 6 and the pickling line tail gas discharged by the pickling line 1 into the acid absorber 7 for acid absorption to generate regenerated acid; the tail gas outlet of the acid absorber 7 is sequentially connected with the denitration reactor 8 and the sludge evaporator 2 through a gas transmission pipeline, and is used for transmitting acid absorption tail gas after acid absorption in the acid absorber 7 to the denitration reactor 8 for denitration treatment, and using high-temperature tail gas after denitration reaction for heat exchange with acid sludge in the sludge evaporator 2 to evaporate the acid sludge to dryness.
The treatment device can simultaneously and intensively treat the calculation sludge, the waste rinsing water, the waste acid and the tail gas generated by the pickling line, convert metal ions in the acid sludge and the waste rinsing water into a complete resource form of metal oxides, convert the tail gas generated by the high-temperature pyrohydrolysis reaction of the acid sludge, the waste rinsing water and the waste acid and acid components in the tail gas of the pickling line into regenerated acid and recycle the regenerated acid, so as to realize zero emission of waste; meanwhile, because the denitration reaction in the denitration reactor 8 is an exothermic reaction, the acid sludge is heated and evaporated by using the heat released by the denitration reaction, which is beneficial to reducing the energy consumption of the system.
Further, a sludge evaporation tail gas discharge port of the sludge evaporator 2 is communicated with the acid absorber 7 through a gas transmission pipeline. In the embodiment, the sludge evaporation tail gas evaporated from the sludge evaporator 2 is conveyed to the acid absorber 7, and after being sprayed and absorbed, the recyclable effective acidic components in the sludge evaporation tail gas are absorbed by water to form regenerated acid.
Further, a regenerated acid outlet of the acid absorber 7 communicates with the pickling line 1. In the embodiment, the acid regeneration tail gas generated in the roasting reactor 6, the tail gas of the pickling line discharged from the pickling line 1 and the sludge evaporation tail gas evaporated from the sludge evaporator 2 are conveyed to the acid absorber 7 for acid absorption, and the formed regenerated acid can be reused in the pickling line 1.
Further, the rinse water concentrator 4 may be a reverse osmosis membrane device. Furthermore, a regenerated rinsing water outlet of the rinsing water concentrator 4 is communicated with the pickling line 1; and/or the regenerated rinse water outlet of the rinse water concentrator 4 is in communication with the acid absorber 7. The rinse water concentrator of the embodiment adopts a reverse osmosis technology to concentrate the waste rinse water, the generated concentrated solution is sent to the solid-liquid mixer 5, and the generated regenerated rinse water can be reused for the pickling line 1 or for the supplement of the absorption solution in the acid absorber 7, so that the total waste liquid amount can be ensured not to be increased while the regenerated rinse water is recovered.
Further, a heat exchange cooling device 9 is connected in series on the acid absorber 7. This embodiment reduces gas temperature in the sour absorber 7 through heat exchange cooling device 9, makes a large amount of moisture condensation in the gas get into the absorption liquid, supplements the absorption liquid, need not extra moisturizing and can accomplish sour absorption by oneself, simultaneously, is of value to gaseous emission after up to standard.
Further, the sludge evaporator 2 of this embodiment is an indirect heat exchange device, and the high-temperature tail gas discharged from the denitration reactor 8 enters through the heat source gas inlet of the sludge evaporator 2, and is directly discharged from the cold source gas outlet of the sludge evaporator 2 after being subjected to indirect heat exchange with the acid sludge in the sludge evaporator 2.
As shown in fig. 1, the embodiment further provides a zero-emission recycling treatment process for waste in an acid washing process, which includes the following steps:
acid sludge discharged by the acid washing unit 1 is fed into a sludge evaporator 2, heat exchange is carried out between the acid sludge and high-temperature tail gas discharged by a denitration reactor 8 so as to evaporate the acid sludge, generated dry sludge is fed into a grinder 3, and the dry sludge is ground into dry sludge powder and then fed into a solid-liquid mixer 5;
waste rinse water discharged by the pickling line 1 is fed into a rinse water concentrator 4 for concentration, the generated concentrated rinse water is added into a solid-liquid mixer 5, and is fully mixed with dry sludge powder added into the solid-liquid mixer 5 by a grinder 3 in the solid-liquid mixer 5, and the formed sludge mixed liquid is conveyed into a roasting reactor 6; the regenerated rinsing water generated in the rinsing water concentrator 4 is reused in the pickling line 1;
waste acid discharged by the pickling line 1 is fed into the roasting reactor 6 and undergoes a high-temperature pyrohydrolysis reaction together with sludge mixed liquid fed into the roasting reactor 6 by the solid-liquid mixer 5 to generate acid regeneration tail gas and metal oxide;
recovering and transporting the metal oxide in the roasting reactor 6; meanwhile, acid regeneration tail gas in the roasting reactor 6 and tail gas of the pickling line discharged by the pickling line 1 are conveyed into an acid absorber 7 for acid absorption, and acid components in the tail gas are absorbed to form regenerated acid; acid absorption tail gas discharged by the acid absorber 7 is conveyed into the denitration reactor 8 for denitration treatment, high-temperature tail gas subjected to denitration treatment is reused in the sludge evaporator 2 to exchange heat with acid sludge, and system tail gas subjected to heat exchange and temperature reduction is discharged to the atmospheric environment after reaching the standard.
Further, the sludge evaporation tail gas generated by heat exchange in the sludge evaporator 2 is conveyed into the acid absorber 7, and is absorbed in the acid absorber 7 together with the acid regeneration tail gas and the tail gas of the acid washing unit, and the regenerated acid generated after absorption is reused in the acid washing unit 1.
Further, the absorption liquid for absorbing acid in the tail gas in the acid absorber 7 may be supplemented with a condensate produced by a heat exchange cooling device 9 connected in series to the acid absorber 7 or a regenerated rinse water produced by concentrating the waste rinse water in the rinse water concentrator 4. In this embodiment, the absorption liquid is supplemented by the condensate generated by the heat exchange cooling device 9, and when the condensate fails to satisfy the absorption liquid supplementation, the absorption liquid is supplemented by the regenerated rinsing water.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a pickling technology waste zero release resourceful treatment device which characterized in that: comprises an acid washing unit, a sludge evaporator, a grinder, a rinsing water concentrator, a solid-liquid mixer, a roasting reactor, an acid absorber and a denitration reactor; an acid sludge outlet of the acid pickling unit is sequentially connected with the sludge evaporator, the grinder and the solid-liquid mixer through material pipelines; a waste rinsing water outlet of the pickling line is communicated with the rinsing water concentrator, and a concentrated rinsing water outlet of the rinsing water concentrator is communicated with the solid-liquid mixer; the waste acid outlet of the pickling line and the material outlet of the solid-liquid mixer are both communicated with the material inlet of the roasting reactor; and the tail gas outlet of the acid washing unit and the tail gas outlet of the roasting reactor are communicated with the acid absorber, and the tail gas outlet of the acid absorber is sequentially connected with the denitration reactor and the sludge evaporator through a gas transmission pipeline.
2. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: and a sludge evaporation tail gas outlet of the sludge evaporator is communicated with the acid absorber through a gas transmission pipeline.
3. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: and a regenerated acid outlet of the acid absorber is communicated with the pickling line.
4. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: and a regenerated rinsing water outlet of the rinsing water concentrator is communicated with the pickling line.
5. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: the regenerated rinse water outlet of the rinse water concentrator is in communication with the acid absorber.
6. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: and a heat exchange cooling device is connected in series on the acid absorber.
7. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: the rinsing water concentrator is a reverse osmosis membrane device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021014512.0U CN212504546U (en) | 2020-06-05 | 2020-06-05 | Zero-emission recycling treatment device for pickling process waste |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021014512.0U CN212504546U (en) | 2020-06-05 | 2020-06-05 | Zero-emission recycling treatment device for pickling process waste |
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| CN212504546U true CN212504546U (en) | 2021-02-09 |
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| CN202021014512.0U Active CN212504546U (en) | 2020-06-05 | 2020-06-05 | Zero-emission recycling treatment device for pickling process waste |
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