CN211169845U - Pickling waste liquid treatment system and recovery plant - Google Patents
Pickling waste liquid treatment system and recovery plant Download PDFInfo
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- CN211169845U CN211169845U CN201921433790.7U CN201921433790U CN211169845U CN 211169845 U CN211169845 U CN 211169845U CN 201921433790 U CN201921433790 U CN 201921433790U CN 211169845 U CN211169845 U CN 211169845U
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Abstract
The utility model provides a pickling waste liquid treatment system and recovery equipment, which comprises a treatment unit, a recovery unit and a temperature control unit, wherein the treatment unit is used for receiving pickling waste liquid at a preset temperature, the pressure in the treatment unit is standard atmospheric pressure, and the preset temperature is between 60 ℃ and 80 ℃; the gas supply unit is connected with the treatment unit and is used for supplying a first gas to the treatment unit, and the first gas is in contact with the pickling waste liquid and is used as a carrier to carry away volatile gas in the pickling waste liquid; and the liquid drainage unit is connected with the treatment unit and is used for opening to discharge the pickling waste liquid when the pickling waste liquid reaches a set concentration. The saturated vapor pressure of the volatile gas contained in the pickling waste liquid at different temperatures in the first gas is different, so that the pickling waste liquid can realize the transfer of partial moisture and volatile components from a liquid phase to a gas phase under normal pressure, and the aim of evaporating and concentrating the pickling waste liquid is fulfilled.
Description
Technical Field
The utility model relates to a waste liquid treatment field especially relates to a pickling waste liquid treatment system and recovery plant.
Background
The pickling waste liquid mainly refers to an acidic solution which is discharged after the surface of a metal workpiece is cleaned and corroded by single acid or mixed acid and cannot be used continuously, and the pickling waste liquid often contains high-concentration free acid, salt, grease, particulate matters and the like. According to the difference of the used acid, the waste liquid can be divided into hydrochloric acid waste liquid, sulfuric acid waste liquid, nitric acid and hydrofluoric acid waste liquid, phosphoric acid waste liquid and the like. The existing treatment method for the pickling waste liquid comprises a neutralization precipitation method, a diffusion dialysis method, a negative pressure evaporation method, a spray roasting method and the like, wherein the neutralization precipitation method for treating the pickling waste liquid can generate a large amount of sludge and strong brine to be discharged, the concentration of waste acid recovered by the diffusion dialysis method is low, a large amount of low-concentration salt solution is discharged, secondary treatment is needed, the spray roasting method is high in regeneration rate and concentration of waste hydrochloric acid, large in investment and high in operation cost, is only suitable for large steel mills with a large amount of high-grade heat sources, and is difficult to treat the sulfuric acid waste liquid and the phosphoric acid waste liquid.
Compared with the above several pickling waste liquid treatment methods, the negative pressure evaporation method is the most extensive waste acid treatment method in the application range at present, has low requirement on treatment capacity, and is suitable for recycling the pickling waste liquid with various different components, but the pickling waste liquid is treated by the negative pressure evaporation method, and the following defects exist:
1) high negative pressure operation requires high-power vacuum generation equipment, and has high requirements on sealing and strength of equipment materials, so that the equipment processing material consumption is large;
2) the material has strong corrosivity and higher operation temperature, a large amount of corrosion-resistant noble metal (such as titanium and hastelloy) or graphite materials are required to be used, and the cost is higher;
3) the corrosion resistance of the equipment is gradually deteriorated along with the increase of the service life, and particularly intergranular corrosion and stress corrosion are easily generated at positions such as welding positions, lining gaps and the like;
4) the scale and the blockage are easy to occur, the boiling mainly occurs in the evaporator and the heater due to the higher temperature, and the severe boiling causes the phase change interface to easily form hard scale, influences the heat transfer of equipment and the evaporation, and improves the energy consumption;
5) foams are easily generated after boiling and enter condensate, so that the quality of the condensate is deteriorated and the conductivity is increased.
6) Once serious scaling or blockage occurs, the equipment needs to be stopped for a long time for maintenance, and the maintenance workload is large.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a pickling waste liquid treatment system and recovery plant can make the pickling waste liquid carry out evaporative concentration under the ordinary pressure, and reduction in production cost obtains the recovery acid of higher concentration.
In order to achieve the above object, the utility model provides a pickling waste liquid treatment system, include:
the treatment unit is used for receiving pickling waste liquid at a preset temperature;
the gas supply unit is connected with the treatment unit and is used for supplying a first gas to the treatment unit, and the first gas is in contact with the pickling waste liquid and is used as a carrier to carry away volatile gas in the pickling waste liquid;
and the liquid drainage unit is connected with the treatment unit and is used for opening to discharge the pickling waste liquid when the pickling waste liquid reaches a set concentration.
Further, the pressure in the processing unit is a standard atmospheric pressure, and the predetermined temperature is between 60 ℃ and 80 ℃.
Further, the first gas is air.
Further, the volatile gas includes water vapor and/or a volatile acidic gas.
Further, the processing unit comprises a processing cavity and a liquid inlet, the liquid inlet is formed in the top of the processing cavity, and the pickling waste liquid enters the processing cavity through the liquid inlet in a spraying mode.
Further, the processing unit includes treatment chamber and inlet, the air feed unit includes the air feed mouth, the air feed mouth set up in the bottom of treatment chamber, first gas passes through the air feed mouth gets into the treatment chamber with pickling waste liquid fully contacts.
Furthermore, the material of the treatment cavity is plastic.
Based on this, the utility model also provides a pickling waste liquid recovery plant, include:
the condensation system is used for storing washing water and is used for receiving a first gas and a volatile gas, and the first gas and the volatile gas are introduced into the washing water to form a first liquid;
and the heat recovery system is used for receiving the pickling waste liquid discharged by the liquid discharge unit and the first liquid so as to transfer the heat of the first liquid to the pickling waste liquid, conveying the pickling waste liquid to the pickling waste liquid treatment system for retreatment, and conveying the first liquid to the condensation system for reutilization.
Further, the pickling waste liquid recovery device further comprises a heat exchange system, the heat exchange system is connected with the heat recovery system and the pickling waste liquid treatment system, and the heat exchange system is used for receiving the pickling waste liquid output by the heat recovery system, transmitting heat to the pickling waste liquid to enable the pickling waste liquid to reach a preset temperature, and conveying the pickling waste liquid to the pickling waste liquid treatment system for retreatment.
Further, the pickling waste liquid recovery device further comprises a cooling circulation system, the cooling circulation system is connected with the heat recovery system and the condensation system, and the cooling circulation system is used for receiving and cooling the first liquid output by the heat recovery system and conveying the first liquid to the condensation system for recycling.
Further, the pickling waste liquid recovery device further comprises a cooling circulation system, the cooling circulation system is connected with the heat recovery system and the condensation system, and the cooling circulation system is used for receiving and cooling the first liquid output by the heat recovery system and conveying the first liquid to the condensation system for recycling.
Further, the condensing system further comprises a drain port operable to drain the first liquid.
The utility model provides a pickling waste liquid treatment system, which comprises a treatment unit, a temperature control unit and a temperature control unit, wherein the treatment unit is used for receiving pickling waste liquid at a preset temperature; the gas supply unit is connected with the treatment unit and is used for supplying a first gas to the treatment unit, and the first gas is in contact with the pickling waste liquid and is used as a carrier to carry away volatile gas in the pickling waste liquid; and the liquid drainage unit is connected with the treatment unit and is used for opening to discharge the pickling waste liquid when the pickling waste liquid reaches a set concentration. The saturated vapor pressure of the volatile gas contained in the pickling waste liquid at different temperatures in the first gas is different, so that the pickling waste liquid can realize the transfer of moisture and volatile components from a liquid phase to a gas phase at normal pressure, and the aim of evaporating and concentrating the pickling waste liquid is fulfilled. The utility model also provides a pickling waste liquid recovery plant, latent heat after the gaseous liquefaction of the volatile that can effectual utilization pickling waste liquid processing system produced reduces the required energy consumption of equipment to can obtain the recovery acid of higher concentration to the pickling waste liquid multiple treatment.
Drawings
FIG. 1 is a schematic structural diagram of a pickling waste liquid recovery apparatus provided in an embodiment of the present invention;
wherein the reference numerals are:
a-acid pickling waste liquor; b-a first gas; c-a volatile gas; d-a first liquid; e-a second gas;
10-a pickling waste liquor treatment system; 20-a condensation system; 30-a heat recovery system; 40-a heat exchange system; 50-a cooling circulation system;
100-a processing unit; 110-gas supply unit.
Detailed Description
The following description of the embodiments of the present invention will be described in more detail with reference to the drawings. Advantages and features of the present invention will become apparent from the following description and claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
As shown in fig. 1, the present embodiment provides a pickling waste liquid treatment system 10, including:
a processing unit 100 for receiving a pickling waste liquid a at a predetermined temperature;
a gas supply unit 110 connected to the processing unit 100, for supplying a first gas b to the processing unit 100, wherein the first gas b contacts the pickling waste liquid a and carries away a volatile gas c in the pickling waste liquid as a carrier;
and a liquid discharge unit connected to the processing unit 100 and configured to open to discharge the pickling waste liquid a when the pickling waste liquid a reaches a set concentration.
Through blowing the first gas b into the processing unit 100, the saturated vapor pressure of the volatile gas contained in the pickling waste liquid a at different temperatures in the first gas b is different, so that the pickling waste liquid a can realize the transfer of moisture and volatile components from a liquid phase to a gas phase under normal pressure, and the purpose of evaporating and concentrating the pickling waste liquid a is achieved.
The pickling waste liquid a includes, but is not limited to, one or more of a hydrochloric acid waste liquid, a sulfuric acid waste liquid, a nitric acid and hydrofluoric acid waste liquid, and a phosphoric acid waste liquid, and the volatile gas c includes water vapor and/or a volatile acidic gas, that is, the volatile gas may be a mixture of water vapor and a volatile acidic gas, or may be only water vapor.
Further, the pressure inside the processing unit 100 is a standard atmospheric pressure, and the predetermined temperature is between 60 degrees celsius and 80 degrees celsius. The treatment of the pickling waste liquid a is carried out under normal pressure, so that the requirements on the material and the sealing property of equipment are not high, the cost can be effectively saved, and the pickling waste liquid a is treated at the temperature lower than the boiling point, so that the water and part of the acid solution contained in the pickling waste liquid a enter the gas phase from the surface of the liquid film of the pickling waste liquid a, the problem that the phase change interface is violently boiled to generate hard scaling due to overhigh temperature is avoided, the treatment unit 100 is prevented from being blocked, the cost of manual maintenance is reduced, and the production efficiency is improved.
Further, the first gas b is air, and the saturated vapor pressure of the water vapor and the volatile acidic gas in the air is different at different temperatures, so that the water and part of the acid solution in the pickling waste liquid are transferred from the liquid phase to the gas phase, and the water molecules and volatile acidic gas molecules can be combined with the molecules in the air, the air is taken away by the water vapor and the volatile acidic gas as a carrier, the evaporation and concentration of the pickling waste liquid a are realized, the recovered acid with higher concentration is obtained, and the cost of the air is lower, and the air can be directly blown in by an air blower.
Referring to fig. 1, the treatment unit 100 includes a treatment cavity and a liquid inlet, the liquid inlet is disposed at the top of the treatment cavity, and the pickling waste liquid enters the treatment cavity from the liquid inlet in a spraying manner. The pickling waste liquid a is dripped in a water drop mode in a spraying mode, so that the pickling waste liquid a is more favorably and fully contacted with the first gas b, more water vapor and volatile acidic gas can be evaporated from the pickling waste liquid a, and the concentration of recovered acid is improved.
Further, the air feed unit includes the air supply mouth, the air supply mouth set up in the bottom of process chamber, first gas b passes through the air supply mouth gets into the process chamber with pickle liquor a fully contacts for pickle liquor a with first gas b produces the convection current, increases the area of contact of first gas b and pickle liquor.
Further, the material of treatment chamber is plastics, because the temperature of pickling waste liquid a is not high, just the treatment chamber does not need the negative pressure environment, and is not high to the requirement of material, uses the plastics material of corrosion-resistant and well high temperature can great saving cost.
Specifically, the acid pickling waste liquid a is transferred from a liquid phase to a gas phase due to moisture and a part of the acid solution, and the rest of the acid solution is concentrated to form the acid pickling waste liquid with a certain concentration, so that the acid pickling waste liquid after evaporation concentration can be utilized according to self requirements, for example, the acid pickling waste liquid a reaching the set concentration after treatment can be directly discharged through a liquid discharge unit and directly recovered as recovered acid for subsequent utilization, for example, the acid pickling waste liquid a is used for pickling metal workpieces, and the acid pickling waste liquid a not reaching the set concentration can be further treated and then discharged.
For example, the liquid discharge unit includes at least two liquid discharge members, each of which includes a liquid discharge port, and a liquid concentration sensor and a liquid discharge valve provided on the liquid discharge port, and when the liquid concentration sensor detects that the concentration of the pickling waste liquid a reaches a set concentration, one of the liquid discharge valves opens to discharge the pickling waste liquid a, and when the concentration of the pickling waste liquid a does not reach the set concentration, the other liquid discharge valve opens to discharge the pickling waste liquid a and perform reprocessing.
Based on this, the utility model also provides a pickling waste liquid recovery plant, please refer to fig. 1, include:
the pickling waste liquid treatment system 10;
a condensing system 20 storing washing water for receiving a first gas b and a volatile gas c, wherein the first gas b and the volatile gas c are introduced into the washing water to form a first liquid d;
the heat recovery system 30 is configured to receive the pickle liquor a and the first liquid d discharged by the liquid discharge unit, transfer heat of the first liquid d to the pickle liquor a, convey the pickle liquor a to the pickle liquor treatment system 10 for reprocessing, and convey the first liquid d to the condensation system 20 for recycling. In this embodiment, the heat exchange unit is, for example, a pipe divided into two layers, one layer of the pipe is used for flowing the pickling waste liquid a, and the other layer of the pipe is used for flowing the first liquid, so as to transfer the heat of the first liquid d to the pickling waste liquid a.
In this embodiment, the condensing system 20 may cool the volatile gas c discharged from the processing unit 100 by the washing water, so as to lower the temperature of the volatile gas c, so that the water vapor and the volatile acid gas in the volatile gas c can be converted from the gas phase to the liquid phase, forming the first liquid d that can be directly recycled, and the latent heat generated by the liquefaction of the volatile gas c can be recovered by the heat recovery system 30, so as to heat the pickling waste liquid a, thereby achieving the purpose of saving energy. Meanwhile, the second gas e, i.e. air, water vapor or volatile acid-washing gas which does not form liquid, can be discharged through the cooling system and treated through the washing tower, for example, the volatile acid gas is treated by using a weak alkaline solution, so that the outlet air reaches the discharge standard, and the pollution to the environment is avoided. Specifically, the condensing system 20 may be a condensing tower, the volatile gas c may be delivered to the bottom of the cooling system 20 through the top of the processing unit 100, and the washing water may be sprayed downward through the top of the condensing tower to be sufficiently contacted with the volatile gas c.
The first liquid d at least includes water generated after the water vapor is liquefied, and may further include a recovered acid formed by dissolving a volatile acidic gas in water, such as HC L solution, and the first liquid d may be discharged from the cooling system 20 according to its own requirement, or may be recycled, without limitation.
Further, the pickling waste liquid recycling device further includes a cooling circulation system 50, the cooling circulation system 50 is connected to the heat recovery system 30 and the cooling system 20, the cooling circulation system 50 is configured to receive and cool the first liquid d output by the heat recovery system 30, and transport the first liquid d to the cooling system 20 for recycling, and since the temperature of the first liquid d is still higher than that of the cooling water after the first liquid d transfers heat to the pickling waste liquid a, in order to ensure that the first liquid d can be used for cooling the volatile gas c, the first liquid d can be further cooled by the cooling circulation system 50, and then transported to the cooling system 20 to cool the volatile gas c, so as to ensure the recycling of the washing water, and thus save energy. In the present embodiment, the cooling circulation system 50 includes, but is not limited to, a circulation cooling pump.
Referring to fig. 1, the pickling waste liquid recycling apparatus further includes a heat exchanging system 40, the heat exchanging system 40 is connected to the heat recycling system 30 and the pickling waste liquid treatment system 10, and the heat exchanging system 40 is configured to receive the pickling waste liquid a output by the heat recycling system 30, and transfer heat to the pickling waste liquid a so that the pickling waste liquid a reaches a predetermined temperature and then is conveyed to the pickling waste liquid treatment system 10 for reprocessing. After the heat is transferred to the pickle liquor a by the first liquid d in the heat recovery system, the temperature of the pickle liquor a does not reach the preset temperature, so the pickle liquor a is further heated by the heat exchange system 40, and then the pickle liquor a reaching the preset temperature is conveyed to the pickle liquor treatment system 10 for evaporation concentration again, so that more high-concentration recovered acid can be further obtained. The heat source of the heat exchange unit 40 comprises one or more of raw steam, secondary steam and flue gas, preferably, the heat exchange unit 40 can be an external heat exchanger, and the maintenance is more convenient.
For proving the utility model provides a pickling waste liquid recovery plant possesses practicality and high efficiency, in an experiment, when using this pickling waste liquid recovery plant to handle aluminum product processing anode passivation pickling waste liquid, records that the processing unit internal pressure is the highest 2.0KPa, and pickling waste liquid temperature is 65 ~ 80 ℃, and equipment throughput0.5t/h and the system air volume is 500-800 m3H, evaporation circulation amount of 5-10 m3And h, municipal saturated steam (the pressure intensity is 0.4-0.6 MPa) is adopted as a heat source, the evaporation concentration multiple is 5-8 times, the energy consumption of the system is about 0.4-0.5 t of steam/t of waste water, the recovered acid treated by the cooling system can be directly reused for cleaning the passivated workpiece, and the concentration of sulfuric acid in the recovered acid treated by the pickling waste liquid treatment system is up to 55-60%.
In another experiment, utilize the utility model provides a when pickling waste liquid recovery plant is used for hydrochloric acid pickling waste liquid, record hydrochloric acid concentration 8% ~ 12% in the pickling waste liquid, ferrous chloride content 12% ~ 20%, operating temperature 70 ~ 80 ℃, equipment throughput 1.0t/h, system amount of wind 1500 ~ 2500m3The evaporation circulation amount is 10-20 m3The method is characterized in that rice/h is adopted, municipal saturated steam (the pressure intensity range is 0.4-0.6 MPa) is adopted as a heat source, the energy consumption of a system is only 0.4-0.45 t steam/t waste acid, the concentration of the obtained recovered hydrochloric acid is up to more than 16%, the recovered hydrochloric acid can be completely recycled for acid pickling and acid preparation, the concentration of the obtained low-concentration recovered acid is 5% -8%, the low-concentration recovered acid is treated and discharged after reaching the standard, and no sludge is generated. The ferrous chloride crystal produced by the system is 0.18-0.3 t/h, and can be used as a byproduct to realize resource recycling.
To sum up, the utility model provides a pickling waste liquid treatment system is through going into to the processing unit drum first gas utilizes volatility gas in the pickling waste liquid under the different temperatures saturated vapor pressure in the first gas is different for the pickling waste liquid can realize under the ordinary pressure that moisture and volatile component shift from the liquid phase to the gaseous phase, form vapor or volatile acid gas promptly, thereby reach and make the concentrated purpose of pickling waste liquid evaporation, whole reaction go on under the ordinary pressure, device simple structure, the cost is low to can obtain the recovery acid of higher concentration, so that follow-up recycle has practiced thrift the resource. The utility model also provides a pickling waste liquid recovery plant, latent heat after can effectually utilizing pickling waste liquid treatment system to produce the gas liquefaction reduces the required energy consumption of equipment to can obtain the recovery acid of higher concentration to the pickling waste liquid multiple treatment.
The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.
Claims (9)
1. A pickling waste liquid treatment system is characterized by comprising:
the treatment unit is used for receiving the pickling waste liquid at a preset temperature, the pressure in the treatment unit is a standard atmospheric pressure, and the preset temperature is between 60 and 80 ℃;
the gas supply unit is connected with the treatment unit and is used for supplying a first gas to the treatment unit, and the first gas is in contact with the pickling waste liquid and is used as a carrier to carry away volatile gas in the pickling waste liquid;
and the liquid drainage unit is connected with the treatment unit and is used for opening to discharge the pickling waste liquid when the pickling waste liquid reaches a set concentration.
2. The pickle liquor treatment system of claim 1, wherein the first gas is air.
3. The pickle liquor treatment system of claim 1, wherein the volatile gas comprises water vapor and/or a volatile acidic gas.
4. The pickling waste liquid treatment system of claim 1, wherein the treatment unit comprises a treatment chamber and a liquid inlet, the liquid inlet is arranged at the top of the treatment chamber, and the pickling waste liquid enters the treatment chamber from the liquid inlet in a spraying manner.
5. The pickling waste liquid processing system as set forth in claim 4, wherein said gas supply unit includes a gas supply port provided at a bottom of said processing chamber, and said first gas enters said processing chamber through said gas supply port to be in sufficient contact with said pickling waste liquid.
6. The pickle liquor treatment system of claim 4, wherein the treatment chamber is made of plastic.
7. The utility model provides a pickling waste liquid recovery plant which characterized in that includes:
the pickling waste liquid treatment system according to any one of claims 1 to 6;
the condensation system is used for storing washing water and is used for receiving a first gas and a volatile gas, and the first gas and the volatile gas are introduced into the washing water to form a first liquid;
and the heat recovery system is used for receiving the pickling waste liquid discharged by the liquid discharge unit and the first liquid so as to transfer the heat of the first liquid to the pickling waste liquid, conveying the pickling waste liquid to the pickling waste liquid treatment system for retreatment, and conveying the first liquid to the condensation system for reutilization.
8. The spent pickle liquor recovery apparatus of claim 7, further comprising a heat exchange system connected to the heat recovery system and the spent pickle liquor treatment system, the heat exchange system being configured to receive the spent pickle liquor from the heat recovery system, transfer heat to the spent pickle liquor to bring the spent pickle liquor to a predetermined temperature, and convey the spent pickle liquor to the spent pickle liquor treatment system for reprocessing.
9. The pickling waste liquid recovery apparatus as claimed in claim 7, further comprising a cooling circulation system connected to the heat recovery system and the condensation system, the cooling circulation system being configured to receive and cool the first liquid output from the heat recovery system and to send the first liquid to the condensation system for reuse.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110407175A (en) * | 2019-08-30 | 2019-11-05 | 上海易湃环境工程技术有限公司 | Pickle liquor processing system and reclaimer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110407175A (en) * | 2019-08-30 | 2019-11-05 | 上海易湃环境工程技术有限公司 | Pickle liquor processing system and reclaimer |
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