CN114653079A - Waste acid concentration recovery device - Google Patents

Abstract

The invention provides a waste acid concentration and recovery device, which relates to the technical field of chemical waste acid treatment. A waste acid concentration and recovery device includes an evaporation tower, a heat exchange component, a regeneration acid tank and a fan; the evaporation tower includes an evaporation tower body, a packing layer, a gas-liquid separator and a first water distribution system, the packing layer, the gas-liquid separator and the first water distribution system are arranged in the evaporation tower body from bottom to top in sequence; the heat exchange component is connected with the first water distribution system; the regeneration acid tank and the fan are respectively connected with the evaporation tower. The waste acid concentration and recovery device provided by the present invention adopts the mechanism of surface vaporization and evaporation, that is, the difference of the saturated vapor pressure of water molecules in air of different temperatures is used as the mass transfer power to realize the evaporation of water, and the evaporation can be realized at a lower temperature. Under the condition of spontaneous evaporation, the energy consumption is reduced.

Description

A waste acid concentration recovery device

technical field

The invention relates to the technical field of chemical waste acid treatment, in particular to a waste acid concentration and recovery device.

Background technique

In the field of anodized waste acid concentration, a graphite multi-effect evaporator is usually used to evaporate and concentrate the waste acid, and the water is evaporated from the acid solution, and the concentrated regenerated acid is recycled. Multi-effect evaporators are relatively mature in the field of salt chemical industry, but in the condition of waste acid concentration, due to the complexity and high corrosiveness of waste acid components, it is difficult for graphite multi-effect evaporators to run stably for a long time. The existing waste acid recovery process mainly has the following problems: 1. The graphite multi-effect evaporation equipment is too bulky and has many parts, which is not conducive to disassembly and installation; 2. The working principle of multi-effect evaporation is complicated, and it is necessary to observe the inside of the tube at any time. 3. High cost and operating energy consumption; 3. Serious equipment corrosion; 4. Large investment in routine maintenance equipment, limited concentration and impact on exhaust gas. Therefore, it is very important to develop a waste acid recovery device with simple process, cost saving and energy reduction.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a waste acid concentration and recovery device, which has the advantages of reduced energy consumption, strong applicability, simple maintenance, few wearing parts, and simple process principle.

Embodiments of the present invention are implemented as follows:

In the first aspect, the embodiment of the present application provides a waste acid concentration and recovery device, which includes an evaporation tower, a heat exchange component, a regenerated acid tank and a fan; the evaporation tower includes an evaporation tower body, a packing layer, a gas-liquid separator and a first The water distribution system, the above-mentioned packing layer, the above-mentioned gas-liquid separator and the above-mentioned first water distribution system are sequentially arranged in the above-mentioned evaporation tower body from bottom to top; the above-mentioned heat exchange components are connected with the above-mentioned first water distribution system; the above-mentioned regeneration acid The tank and the fan are respectively connected to the above-mentioned evaporation towers.

The waste acid enters the lower part of the evaporation tower, is preheated and heated up through the heat exchange component, and then enters the evaporation tower through the connecting pipe at the top of the tower, and the waste acid is spread on the surface of the packing layer by the first water distribution system. The air is blown into the lower part of the evaporation tower by the fan, and the gas rises naturally, flows through the packing layer, and conducts heat and mass transfer with the waste acid on the surface of the packing. decrease until the spent acid reaches the target concentration. The concentrated acid is sent to the regeneration acid tank through the pipeline to realize the recovery and utilization of the waste acid.

In some embodiments of the present invention, the heat exchange assembly includes a medium circulation pump, a preheating heat exchanger and a steam heat exchanger connected in sequence, the medium circulation pump is connected to the bottom of the evaporation tower body, and the steam heat exchanger is connected to the bottom of the evaporation tower body. The above-mentioned first water distribution systems are connected to each other.

In some embodiments of the present invention, the above-mentioned filler layer is provided with spherical fillers.

In some embodiments of the present invention, the above-mentioned waste acid concentration and recovery device further comprises a condensing tower and a condensing-recovery component connected to each other, and the above-mentioned condensing tower is connected to the above-mentioned evaporation tower through pipes.

In some embodiments of the present invention, the above-mentioned condensing tower includes a condensing tower body and a tray, and the above-mentioned tray is arranged in the above-mentioned condensing tower body.

In some embodiments of the present invention, the number of the above-mentioned trays is multiple, and a plurality of the above-mentioned trays are arranged in layers and evenly spaced in the above-mentioned condensation tower body. In some embodiments of the present invention, the above-mentioned condensing tower further comprises a second water distribution system and a third water distribution system, the above-mentioned second water distribution system is arranged on the top of the body of the above-mentioned condensation tower, and the above-mentioned third water distribution system is arranged on the above-mentioned The inner part of the condensing tower body.

In some embodiments of the present invention, the condensation recovery assembly includes a primary condensation recovery unit, the primary condensation recovery unit includes a condensate circulating pump and a condensate cooler connected to each other, and the condensate circulating pump is connected to the bottom of the condensing tower body The above-mentioned condensate cooler and the above-mentioned second water distribution system are connected to each other, and the above-mentioned condensate circulating pump, the above-mentioned condensate cooler and the above-mentioned second water distribution system together form a condensing cycle.

In some embodiments of the present invention, the condensation recovery assembly further includes a secondary condensation recovery unit, and the secondary condensation recovery unit includes a preheating circulating pump, which is exchanged with the bottom of the condensing tower body and the preheating respectively. The heaters are connected to each other, the preheating heat exchanger and the third water distribution system are connected to each other, and the preheating circulation pump, the preheating heat exchanger and the third water distribution system together form a secondary condensation cycle.

In some embodiments of the present invention, the above-mentioned condensate cooler is provided with a cooling circulating water inlet and a cooling circulating water outlet.

Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

1. A waste acid concentration recovery device provided by the present invention evaporates the water in the waste acid in a non-boiling state, but utilizes the difference of the saturated vapor pressure of water molecules in the air at different temperatures as a mass transfer power to achieve Water evaporation can be controlled to spontaneously evaporate at a lower temperature, reducing energy consumption.

2. Due to the low operating temperature of the waste acid concentration and recovery device provided by the present invention, the phase change interface has no heat transfer requirements, and the phase change interface of the separation equipment can be made of PPH non-metallic materials without the need to use traditional evaporation technology to make evaporators. Various metal materials can greatly improve the applicability of the device, especially the treatment of corrosive waste acid.

3. The engine equipment of the waste acid concentration and recovery device provided by the present invention only uses a fan and a water pump, and has the advantages of simple maintenance and few wearing parts.

4. The waste acid concentration and recovery device provided by the present invention uses air as the extraction medium for water vapor, and the entire process of evaporation and condensation is carried out under normal pressure, and does not require traditional evaporators that use negative pressure or high pressure for evaporation. (Multi-effect evaporator) uses high-standard sealing materials and structural parts, which greatly improves the reliability of the system.

5. The waste acid concentration and recovery device provided by the present invention can not only use steam as a heat source, but also use waste heat above 85°C as a heat source to achieve the purpose of saving energy consumption.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a waste acid concentration and recovery device in Embodiment 1 of the present invention;

Fig. 2 is the structural representation of the evaporation tower in the embodiment of the present invention 1;

Fig. 3 is the structural representation of the condensation tower in the embodiment of the present invention 1;

4 is a schematic structural diagram of a waste acid concentration and recovery device in Embodiment 2 of the present invention.

Icons: 100, evaporation tower; 100a, evaporation tower A; 100b, evaporation tower B; 101, evaporation tower body; 102, packing layer; 103, gas-liquid separator; 104, first water distribution system; 200, condensation tower; 200a, condensing tower A; 200b, condensing tower B; 201, condensing tower body; 202, tray; 203, second water distribution system; 204, third water distribution system; 301, medium circulating pump; 301a, medium circulating pump A; 301b, medium circulation pump B; 302, preheating heat exchanger; 303, steam heat exchanger; 304, concentrated liquid pump; 401, preheating circulation pump; 402, condensate circulation pump; 403, condensate Cooler; 4031, cooling circulating water inlet; 4032, cooling circulating water outlet; 404, condensate pump; 405, electric control cabinet; 500, fan; 600, regeneration acid tank.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "left", "right", "inside", etc. appear, the orientation or positional relationship is based on what is shown in the accompanying drawings. The orientation or positional relationship of the invention, or the orientation or positional relationship that is usually placed when the product of the invention is used, is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, It is constructed and operated in a particular orientation and is therefore not to be construed as a limitation of the present invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, "a plurality of" means at least two.

In the description of the embodiments of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Example 1

1-3, the present embodiment provides a waste acid concentration and recovery device, which may include an evaporation tower 100, a heat exchange assembly, a regenerated acid tank 600 and a fan 500; the evaporation tower 100 includes an evaporation tower 100 body, a packing layer 102. The gas-liquid separator 103 and the first water distribution system 104, the packing layer 102, the gas-liquid separator 103 and the first water distribution system 104 are sequentially arranged in the body of the evaporation tower 100 from bottom to top; The water distribution system 104 is connected to each other; the regeneration acid tank 600 and the fan 500 are connected to the evaporation tower 100 respectively. When in use, the waste acid enters the lower part of the evaporation tower 100, is preheated and heated up through the heat exchange component, and then enters the evaporation tower 100 through the connecting pipe at the top of the tower, and the waste acid is spread on the surface of the special packing by the first water distribution system 104 . The air is blown into the lower part of the evaporation tower 100 by the fan 500 through the ventilation pipeline, and the gas is in countercurrent contact with the waste acid liquid on the inner packing surface of the evaporation tower 100 to conduct heat and mass transfer, and the formed warm and humid hot air is discharged from the top of the tower to evaporation. The bottom of the tower 100 is in countercurrent contact with the heated waste acid to form a high-temperature humid and hot saturated air, which is discharged from the top of the evaporation tower 100. Part of the water vaporizes into the air, and through the gas-liquid separator 103, the water in the waste acid evaporates less until the waste acid reaches the target concentration. The concentrated acid is sent to the regeneration acid tank 600 through the pipeline to realize the recovery and utilization of the waste acid.

In this embodiment, the heat exchange assembly includes a medium circulating pump 301, a preheating heat exchanger 302 and a steam heat exchanger 303 connected in sequence. The medium circulating pump 301 is connected to the bottom of the evaporation tower 100, and the steam heat exchanger 303 is connected to the A water distribution system 104 is interconnected. When in use, the anodized waste acid is transported into the evaporation tower 100, and the liquid at the bottom of the evaporation tower 100 is pumped by the medium circulation pump 301 to the preheating heat exchanger 302, and the preheating heat exchanger 302 uses the condensed liquid in the condensing tower 200. The heat preheats and raises the temperature of the waste acid, and then flows to the steam heat exchanger 303. The temperature of the waste acid is raised to 80-100° C. by using steam, and then enters the evaporation tower 100 through the connecting pipe at the top of the tower, and the first water distribution system 104 is used. The waste acid is evenly distributed on the surface of the special packing inside the evaporation tower 100 and contacts with the air flowing from the bottom to the top, and heat and mass transfer occurs. The medium circulation pump 301 pumps the liquid at the bottom of the evaporation tower 100 to the top of the evaporation tower 100, and uses the first water distribution system 104 to spread the waste acid on the surface of the special packing inside the evaporation tower 100, and the waste acid is heated by the evaporation tower 100 and contacts with the air Heat and mass transfer occurs, allowing moisture to be transferred from the spent acid to the hot air to form a bottoms concentrate. When the concentration of the concentrated liquid reaches saturation, the system stops circulating and evaporates, and the concentrated liquid is pumped out by the concentrated liquid pump in the concentrated section.

In this embodiment, the filler layer 102 is provided with spherical fillers. With spherical packing can improve the mass transfer efficiency. When in use, the air is blown into the lower part of the tower by the fan 500, the gas rises naturally, flows through the spherical packing of the packing layer 102, and conducts heat and mass transfer with the waste acid on the surface of the spherical packing, and the spherical packing can also improve the mass transfer efficiency.

In this embodiment, a waste acid concentration and recovery device may further include a condensation tower 200 and a condensation recovery component connected to each other, and the condensation tower 200 is connected to the evaporation tower 100 through pipes. The condensing tower 200 and the condensing recovery component realize the recovery and utilization of the condensed liquid and save energy consumption.

In this embodiment, the condensing tower 200 includes a main body of the condensing tower 200 and a tray 202 , and the tray 202 is arranged in the main body of the condensing tower 200 . Tray 202 is the main component of the gas-liquid mass and heat transfer site. The two fluids are closely exchanged for heat and mass between the two phases to achieve the purpose of gas-liquid separation.

In this embodiment, the number of trays 202 is multiple, and the multiple trays 202 are arranged in the body of the condensation tower 200 in layers and evenly spaced. When in use, part of the moisture flowing through the evaporation tower 100 is vaporized into the air, passed through the gas-liquid separator 103, and enters the condensation tower 200 together with the blown air, and then enters a different tray 202 layer, and the moisture in the waste acid evaporates until the waste acid reaches the target concentration, and the concentrated acid is sent to the regeneration acid tank 600 through the pipeline. In addition, the multiple trays 202 are arranged in layers and evenly spaced to better achieve the purpose of gas-liquid separation.

In this embodiment, the condensation tower 200 further includes a second water distribution system 203 and a third water distribution system 204. The second water distribution system 203 is arranged at the top of the body of the condensation tower 200, and the third water distribution system 204 is arranged at the condensation tower. 200 inside the body. The first water distribution system 104, the second water distribution system 203 and the third water distribution system 204 are all composed of a water distribution main pipe, a water distribution branch pipe, a nozzle and connecting pipe fittings, and the function is to uniformly distribute the liquid material on the surface of the packing after atomization. , play the function of evenly distributing water.

In this embodiment, the condensation recovery assembly includes a primary condensation recovery unit, and the primary condensation recovery unit includes a condensate circulating pump 402 and a condensate cooler 403 connected to each other. The condensate circulating pump 402 is connected to the bottom of the condensation tower 200, and the condensate The cooler 403 and the second water distribution system 203 are connected to each other, and the condensate circulating pump 402, the condensate cooler 403 and the second water distribution system 203 together form a condensing cycle. When in use, the air is blown into the lower part of the evaporation tower 100 by the fan 500, the gas naturally rises, flows through the packing layer 102, conducts heat and mass transfer with the waste acid on the surface of the packing layer 102, and part of the water vaporizes into the air, and is separated from gas and liquid. The device 103 enters the condensing tower 200 together with the air blown in, and the humid and hot air condensed by the condensing tower 200 enters the bottom of the condensing tower 200 from the top of the condensing tower 200 through the connecting pipe. The condensate pump 404 enters the condensing heat exchanger, uses cooling circulating water to cool down to 30-35°C, and then enters the top of the condensing tower 200 . The second water distribution system 203 at the top of the condensing tower 200 evenly spreads the condensed liquid into the tray 202 of the condensing tower 200, conducts heat and mass transfer with the moist and hot air flowing from bottom to top, and cools and washes the moist and hot air, so that the The amount of water vapor carried by the water vapor is reduced, and the latent heat of the hot and humid air is recovered until the high-temperature condensate at the bottom of the condensation tower 200 is formed, thereby realizing the primary recovery and utilization of the condensate.

In this embodiment, the condensation recovery assembly further includes a secondary condensation recovery unit, and the secondary condensation recovery unit includes a preheating circulating pump 401, which is respectively connected to the bottom of the condensing tower 200 and the preheating heat exchanger 302. , the preheating heat exchanger 302 and the third water distribution system 204 are connected to each other, and the preheating circulation pump 401, the preheating heat exchanger 302 and the third water distribution system 204 together form a secondary condensation cycle. When in use, the air is blown into the lower part of the evaporation tower 100 by the fan 500 through the ventilation pipeline, and the gas is in countercurrent contact with the waste acid liquid on the inner packing surface of the evaporation tower 100 from bottom to top for heat and mass transfer, and the formed warm and humid hot air evaporates from the The top of the tower 100 is discharged to the bottom of the evaporation tower 100, and is in countercurrent contact with the heated waste acid to form a high-temperature humid and hot saturated air. After the preheating heat exchanger 302 exchanges heat with the concentrated circulating liquid to cool down, it enters the third water distribution system 204 in the middle of the condensation tower 200 to recover the latent heat energy of the secondary steam evaporated by the system to realize the secondary recovery and utilization of the condensed liquid.

In this embodiment, the condensate cooler 403 is provided with a cooling circulating water inlet and a cooling circulating water outlet 4032 . When in use, the condensate circulating pump 402 pumps part of the condensate 404 into the condensate cooler 403, and uses the connected cooling circulating water to cool the condensate to 30-35°C.

Example 2

In this embodiment, as shown in FIG. 4 , the number of the above-mentioned evaporation tower 100, condensation tower 200 and medium circulating pump 301 is two, which are respectively expressed as evaporation tower A 100a, evaporation tower B 100b, condensation tower A 200a, condensation tower Column B 200b, medium circulating pump A 301a and medium circulating pump B 301b, other components are the same as those in Example 1, and will not be repeated here, and their working principles are as follows:

The anodic oxidation waste acid is transported into the evaporation tower A 100a, and the liquid at the bottom of the evaporation tower A 100a is pumped by the medium circulation pump A 301a to the preheating heat exchanger 302, and the preheating heat exchanger 302 utilizes the condensed liquid in the condensing tower A 200a. The heat preheats and raises the temperature of the waste acid, and then flows to the steam heat exchanger 303. The temperature of the waste acid is raised to 80-100°C by steam, and then enters the evaporation tower B100b through the connecting pipe at the top of the tower, and the waste acid is made by the liquid distributor. The special packing surface evenly distributed inside the evaporation tower B 100b contacts with the air flowing from bottom to top, and heat and mass transfer occurs. The medium circulation pump B 301b pumps the bottom liquid of the evaporation tower B 100b to the top of the evaporation tower A 100a, and uses the liquid distributor to spread the waste acid on the surface of the special packing inside the evaporation tower A 100a, and the heated waste acid in the tower contacts with the air Heat and mass transfer occurs, allowing moisture to be transferred from the spent acid to the hot air to form a bottoms concentrate. When the concentration of the concentrated liquid reaches saturation, the system stops circulating and evaporates, and the concentrated liquid is pumped out by the concentrated liquid pump in the concentrated section.

The air is blown into the lower part of the evaporation tower A100a through the ventilation pipeline by the fan 500, and the gas is in countercurrent contact with the waste acid liquid on the inner packing surface of the evaporation tower A100a from the bottom to the top for heat and mass transfer, and the formed warm and humid hot air is discharged from the top of the tower to At the bottom of evaporation tower B 100b, it is in countercurrent contact with the heated waste acid to form high-temperature humid and hot saturated air and is discharged from the top of evaporation tower B 100b, and then enters the high-temperature condensed water formed by condensation tower A200a, and is transported to the preheating exchange by preheating circulating pump 401. The heat exchanger 302 exchanges heat with the concentrated circulating liquid to cool down and then enters the top water distribution system of the condensation tower A 200a to recover the latent heat energy of the secondary steam evaporating in the system.

The humid and hot air after condensation of the condensation tower A 200a enters the bottom of the condensation tower B 200b from the top of the condensation tower A 200a through the connecting pipe. The bottom of the condensation tower B 200b is provided with a condensate circulating pump 402, and the condensate pump 404 is fed into the condensing heat exchanger, using The cooling circulating water is cooled to 30-35°C, and then enters the top of the condensation tower B 200b. The water distribution system at the top of the condensing tower B 200b spreads the condensed liquid evenly into the tray 202 of the condensing tower B 200b, conducts heat and mass transfer with the moist hot air flowing from bottom to top, and condenses to form droplets into the condensed liquid, The low-temperature dry air formed by countercurrent contact is discharged from the system at the top of the tower. After the liquid level in the condensing tower B200b rises to the overflow height, part of the condensate is discharged from the condensing tower B200b to the condensed water tank, and then pumped out by the condensate pump 404.

The automatic control of the whole device system is completed by the electric control cabinet 405, which can realize one-key start-stop and remote control.

To sum up, the embodiment of the present invention provides a waste acid concentration and recovery device, the waste acid enters the lower part of the evaporation tower 100, the medium circulation pump 301 is used to pump the tower bottom liquid to the preheating heat exchanger 302, and the heat of the condensate is used as the heat medium After heating up, it flows to the steam heat exchanger 303, and the temperature is raised to 80-100 °C, and then enters the evaporation tower 100 through the connecting pipe at the top of the tower, and uses the first water distribution system 104 to spread the waste acid on the surface of the special packing layer 102. . The air is blown into the lower part of the evaporation tower 100 by the fan 500, and the gas naturally rises, flows through the packing layer 102, and conducts heat and mass transfer with the waste acid on the surface of the spherical packing, and part of the water vaporizes into the air, and passes through the gas-liquid separator 103. The incoming air enters the condensation tower 200 together, and the water in the waste acid evaporates less until the waste acid reaches the target concentration, and the concentrated acid is sent to the regeneration acid tank 600 through the pipeline. The preheating circulating pump 401 sends the high-temperature condensate at the bottom of the condensing tower 200 to the preheating heat exchanger 302, and transfers the heat of the high-temperature condensate to the medium side for preheating, thereby saving the consumption of raw steam for heating the medium side. The condensed liquid after heat exchange and cooling is returned to the third water distribution system 204 in the middle and lower high temperature section of the condensation tower 200 to recover the latent heat of the secondary steam in the evaporation system. A condensate circulating pump 402 is arranged at the bottom of the condensing tower 200, and part of the condensing liquid pump 404 is fed into the condensing liquid cooler 403. The second water distribution system 203 cools and washes the hot and humid air to reduce the amount of water vapor carried by the hot and humid air, and at the same time recovers the latent heat of the hot and humid air until a high temperature condensate at the bottom of the condensation tower 200 is formed. The whole process realizes the recovery and utilization of the condensate, and can also use the latent heat of the condensate as a heat source to save energy consumption, and at the same time realize the concentration and recycling of waste acid. The preheating heat exchanger 302, the steam heat exchanger 303 and the condensate cooler 403 in this system all use corrosion-resistant detachable plate heat exchangers, which greatly improves the heat transfer efficiency of the system, saves investment, occupies a small area, and is convenient Operation and maintenance.

The waste acid concentration and recovery device provided by the present invention adopts the mechanism of surface vaporization and evaporation, that is, the difference of the saturated vapor pressure of water molecules in the air of different temperatures is used as the mass transfer power to realize the water evaporation, and the evaporation can be realized at a lower temperature. Under the condition of spontaneous evaporation, the energy consumption is reduced. In addition, due to the low operating temperature of the waste acid concentration and recovery device, there is no need for heat transfer at the phase change interface, and the phase change interface of the separation equipment can use PPH non-metallic materials instead of using traditional evaporation technology to make evaporators using various metal materials. It can greatly improve the applicability of the device, especially the treatment of corrosive waste acid.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A waste acid concentration recovery device is characterized by comprising an evaporation tower, a heat exchange assembly, a regeneration acid tank and a fan; the evaporation tower comprises an evaporation tower body, a packing layer, a gas-liquid separator and a first water distribution system, wherein the packing layer, the gas-liquid separator and the first water distribution system are sequentially arranged in the evaporation tower body from bottom to top; the heat exchange assembly is connected with the first water distribution system; the regeneration acid tank and the fan are respectively connected with the evaporation tower.

2. The waste acid concentrating and recycling device according to claim 1, wherein the heat exchange assembly comprises a medium circulating pump, a preheating heat exchanger and a steam heat exchanger which are connected in sequence, the medium circulating pump is connected to the bottom of the evaporation tower body, and the steam heat exchanger is connected with the first water distribution system.

3. A waste acid concentrating and recycling device as claimed in claim 1, wherein the packing layer is provided with a spherical packing.

4. The waste acid concentrating and recycling device according to claim 1, further comprising a condensing tower and a condensing and recycling assembly connected with each other, wherein the condensing tower is connected with the evaporating tower through a pipeline.

5. A waste acid concentrating and recycling device according to claim 4, wherein the condensing tower comprises a condensing tower body and a tray, and the tray is arranged in the condensing tower body.

6. A waste acid concentrating and recycling device as claimed in claim 5, wherein said number of said trays is plural, and a plurality of said trays are arranged in said condensing tower body in a layered and evenly spaced manner.

7. The waste acid concentrating and recycling device according to claim 4, wherein the condensing tower further comprises a second water distribution system and a third water distribution system, the second water distribution system is arranged at the top of the condensing tower body, and the third water distribution system is arranged in the middle of the condensing tower body.

8. The waste acid concentrating and recycling device according to claim 7, wherein the condensing and recycling assembly comprises a primary condensing and recycling unit, the primary condensing and recycling unit comprises a condensate circulating pump and a condensate cooler which are connected with each other, the condensate circulating pump is connected to the bottom of the condensing tower body, the condensate cooler is connected with the second water distribution system, and the condensate circulating pump, the condensate cooler and the second water distribution system together form a primary condensing cycle.

9. The waste acid concentrating and recycling device according to claim 8, wherein the condensing and recycling assembly further comprises a secondary condensing and recycling unit, the secondary condensing and recycling unit comprises a preheating circulating pump, the preheating circulating pump is respectively interconnected with the bottom of the condensing tower body and the preheating heat exchanger, the preheating heat exchanger is interconnected with the third water distribution system, and the preheating circulating pump, the preheating heat exchanger and the third water distribution system jointly form a secondary condensing cycle.

10. A waste acid concentrating and recycling device as claimed in claim 8, wherein the condensate cooler is provided with a cooling circulation water inlet and a cooling circulation water outlet.

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