Evaporative condenser for resource utilization of chemical waste liquid

Abstract

The application discloses an evaporative condenser for resource utilization of chemical waste liquid, and belongs to the technical field of waste liquid treatment. The evaporative condenser comprises a waste liquid pretreatment mechanism arranged on one side of a waste liquid evaporation box. The waste liquid pretreatment mechanism is used for acid-base neutralization and filtration treatment of the chemical waste liquid, so that the evaporation and condensation efficiency is ensured. The waste liquid pretreatment mechanism is used for filtering solid impurities and adjusting the pH value of the chemical waste liquid, so that the chemical waste liquid is adjusted to the optimal evaporation condition. A controller arranged on one side of the waste liquid pretreatment mechanism is used for dynamically adjusting the pH value and judging the evaporation condition of the waste liquid. The waste liquid is evaporated by the waste liquid evaporation box. A descaling mechanism arranged in the waste liquid evaporation box drives the waste liquid to rotate, so that the evaporation of the waste liquid is accelerated, the deposition of the sediment on the surface of a heating element is reduced, and the heat exchange of a condensing coil and the water vapor spraying of a spraying mechanism are used for accelerating the cooling and liquefaction of the steam.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste liquid treatment, more particularly, it relates to an evaporative condenser for resource utilization of chemical waste liquid. BACKGROUND

[0002] Evaporative condensers are widely used in the chemical industry, especially in chemical reactions, distillation, and gas cooling processes, where efficient heat management is crucial. Due to their efficient heat exchange and energy-saving characteristics, evaporative condensers have become important cooling equipment in many chemical production processes. In some chemical processes, acidic or alkaline waste liquid is a common byproduct. Certain components in acidic or alkaline waste liquid can be recovered through evaporation and condensation processes. For example, volatile acidic gases such as hydrogen chloride and sulfuric acid mist can be condensed by evaporative condensers to recover acidic liquids or neutralized and reused through subsequent processing. In this way, not only can waste liquid emissions be reduced, but resource reuse rates can also be improved, and waste liquid pollutant emissions can be reduced, achieving the dual goals of environmental protection and resource reuse.

[0003] In existing chemical waste liquid treatment equipment, mineral substances or other dissolved substances in the chemical waste liquid can deposit during heating, forming scale. Some of the scale accumulates on the surface of the heat exchanger and solidifies to form a scale layer, which is difficult to clean. In addition, during high-temperature evaporation, the continuous accumulation of scale can affect the heating efficiency and even cause the heat exchanger to be blocked. SUMMARY

[0004] To address the deficiencies in the prior art, the present application aims to provide an evaporative condenser for resource utilization of chemical waste liquid.

[0005] The object of the present application can be achieved by the following technical solutions:

[0006] An evaporative condenser for resource utilization of chemical waste liquid, comprising:

[0007] A waste liquid pretreatment mechanism is provided on one side of the waste liquid evaporation tank. The waste liquid pretreatment mechanism is used for acid-base neutralization and filtration treatment of the chemical waste liquid to ensure the efficiency of evaporation and condensation.

[0008] A waste liquid evaporation tank is provided at the bottom of the condensation tank. The waste liquid evaporation tank is used to evaporate acidic and alkaline gases from the waste liquid. A plurality of heating elements are provided in the waste liquid evaporation tank. The heating elements are composed of a plurality of arrayed electric heating rods.

[0009] One end of the evaporation exhaust pipe is connected to one side of the waste liquid evaporation tank, and the other end of the evaporation exhaust pipe is connected to the top of the condensation tank.

[0010] The descaling mechanism is arranged in the waste liquid evaporation box, and is used for removing the scaling on the heating part; the descaling mechanism comprises a descaling rod, the descaling rod is installed at the bottom of a vibrating seat, a vibrating motor for driving the descaling rod to vibrate is arranged in the vibrating seat, a lifting part for driving the descaling rod to move is arranged at the top of the vibrating seat, a rotating groove is formed in the bottom of the descaling rod, a cleaning part is arranged at the bottom of the descaling rod, the cleaning part is rotatably arranged in the rotating groove, the cleaning part comprises a cleaning seat, a brush surface is arranged at the bottom of the cleaning seat, limit grooves are arranged at the two sides of the cleaning seat, elastic parts are arranged in the limit grooves, one end of the elastic part is installed on the inner wall of the rotating groove, and the other end is in abutting engagement with the limit seat of the cleaning seat, the lifting part is installed at the bottom of an end seat, the end seat is rotatably installed on the waste liquid evaporation box, and a rotating motor for driving the end seat to rotate is arranged on the waste liquid evaporation box.

[0011] The condensing box is provided with a condensing coil, and the condensing coil is filled with a coolant.

[0012] As a further scheme of the application, the waste liquid pretreatment mechanism comprises a pretreatment box, the pretreatment box is communicated with the waste liquid evaporation box, one side of the pretreatment box is provided with a liquid inlet pipe communicated with the chemical waste liquid, a solid filter screen is arranged in the pretreatment box, the solid filter screen is arranged obliquely, the oblique angle of the solid filter screen can be 30-45°, and a PH adjusting part is arranged above the solid filter screen.

[0013] As a further scheme of the application, the PH adjusting part comprises a PH test probe and a PH dosing port, the PH test probe detects the pH value of the chemical waste liquid in the pretreatment box, and the PH dosing port is used for adding acid or alkali to neutralize the pH value of the waste liquid.

[0014] As a further scheme of the application, a discharge door plate is rotatably installed on one side of the pretreatment box, the discharge door plate is arranged on one side of the solid filter screen, an electric push rod is arranged on the pretreatment box, and a piston rod of the electric push rod is rotatably connected with the end of the discharge door plate.

[0015] As a further scheme of the application, the cleaning seat is rotatably installed on the rotating groove through a fixing column.

[0016] As a further scheme of the application, one side of the condensing box is provided with an input pipe and an output pipe, the input pipe and the output pipe are respectively communicated with two ends of the condensing coil, and a liquid discharge pipe is arranged at the bottom of the condensing box, the liquid discharge pipe is used for discharging the re-liquefied solution.

[0017] As a further scheme of the present application, a spraying mechanism is arranged on the top of the condensing box, which comprises a plurality of spraying pipes, a plurality of spraying heads are arranged on the spraying pipes, the spraying pipes are communicated with a water supply pipe, cooling water is supplied into the water supply pipe, and is sprayed into the condensing box through the spraying pipes, so that the cooling water combines with the steam to accelerate the liquefaction of the steam.

[0018] As a further scheme of the present application, a controller is arranged on one side of the waste liquid pretreatment mechanism, which is used to control the pH value of the chemical waste liquid in the pretreatment tank of the waste liquid pretreatment mechanism in real time.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application filters the solid impurities in the chemical waste liquid and adjusts the pH value of the chemical waste liquid through the waste liquid pretreatment mechanism, adjusts the chemical waste liquid to the optimal evaporation condition, the controller on one side of the waste liquid pretreatment mechanism realizes the dynamic adjustment of the pH value and judges the evaporation condition of the waste liquid, the waste liquid is evaporated through the waste liquid evaporation tank, the descaling mechanism in the waste liquid evaporation tank drives the waste liquid to rotate to accelerate the evaporation of the waste liquid, reduces the accumulation of the deposits on the surface of the heating element, and accelerates the cooling and liquefaction of the steam through the heat exchange of the condensing coil and the water vapor spraying of the spraying mechanism, so that the resource recycling of the chemical waste liquid is realized.

[0021] The waste liquid pretreatment mechanism filters and removes the solid impurities in the waste liquid through the solid filter screen, prevents the interference of the solid particles on the evaporation process and the blockage during the condensation, detects the pH value of the chemical waste liquid in the pretreatment tank through the pH test probe, adds acid or alkali through the pH dosing port to neutralize the pH value of the waste liquid, improves the evaporation efficiency of the chemical waste liquid, and improves the evaporation efficiency of the chemical waste liquid.

[0022] The descaling rod on the descaling mechanism contacts the surface of the heating element and washes the scaling deposited on the surface of the heating element through the brush surface, the cleaning element on the descaling rod is driven to vibrate through the vibration motor, the separation between the scaling and the heating element is accelerated, the cleaning efficiency is higher, and when the chemical waste liquid is evaporated, the descaling rod can be rotated, the waste liquid is driven to rotate by the descaling rod, the waste liquid is more uniformly heated, the contact area between the waste liquid and the gas is increased, the evaporation of the waste liquid is accelerated, the deposition of the dirt on the heating element during the evaporation is reduced, the formation of the deposits is minimized, the evaporation efficiency is improved, and the service life of the equipment is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the evaporation type condenser for resource recycling of chemical waste liquid.

[0024] Figure 2 It is a sectional view of the waste liquid evaporation tank and the condensing tank in the present application.

[0025] Figure 3 It is a structural schematic diagram of the waste liquid pretreatment mechanism in the application.

[0026] Figure 4 It is a structural schematic diagram of the scale removal mechanism in the application.

[0027] Figure 5 It is a structural schematic diagram of the cleaning part in the application.

[0028] Figure 6 It is a structural schematic diagram of the evaporative condenser in Example 2.

[0029] In the figure: 1, waste liquid pretreatment mechanism; 11, pretreatment box; 12, liquid inlet pipe; 13, solid filter screen; 14, PH adjusting part; 15, PH test probe; 16, PH dosing port; 17, discharge door plate; 18, electric push rod; 2, waste liquid evaporation box; 21, heating part; 3, scale removal mechanism; 31, scale removal rod; 32, vibration seat; 33, lifting part; 34, cleaning part; 35, rotating groove; 36, cleaning seat; 37, brush surface; 38, limiting groove; 39, elastic part; 4, condensation box; 41, condensation coil; 42, input pipe; 43, output pipe; 44, liquid discharge pipe; 5, spraying mechanism; 51, spraying pipe; 52, spraying head; 53, water supply pipe; 6, evaporation discharge pipe; 7, controller. DETAILED DESCRIPTION

[0030] The application will be further described below in conjunction with the drawings and specific embodiments. The embodiments of the application are given for illustration and description only, and are not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments were chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

[0031] Example 1

[0032] Referring to Figures 1-5 As shown in the figure, the application is an evaporative condenser for resource utilization of chemical waste liquid, which comprises a waste liquid pretreatment mechanism 1, a waste liquid evaporation box 2, a scale removal mechanism 3, a condensation box 4 and a spraying mechanism 5.

[0033] The waste liquid pretreatment mechanism 1 is arranged on one side of the waste liquid evaporation box 2, and is used for pretreating the chemical waste liquid to ensure the efficiency during evaporation and condensation. The waste liquid pretreatment mechanism 1 comprises a pretreatment box 11, which is communicated with the waste liquid evaporation box 2. An inlet pipe 12 for communicating with the chemical waste liquid is arranged on one side of the pretreatment box 11. A solid filter screen 13 is arranged in the pretreatment box 11. The solid filter screen 13 is used for filtering and removing the solid impurities in the waste liquid, preventing the solid particles from interfering with the evaporation process and blocking during condensation. A PH adjusting part 14 is arranged above the solid filter screen 13. The PH adjusting part 14 comprises a PH test probe 15 and a PH dosing port 16. The PH test probe 15 is used for detecting the pH value of the chemical waste liquid in the pretreatment box 11. The PH dosing port 16 is used for adding acid or alkali to neutralize the pH value of the waste liquid. If the pH value of the waste liquid is too extreme (for example, too acidic or too alkaline), the pH value needs to be adjusted to a range suitable for evaporation through dilution or neutralization treatment.

[0034] A discharge door plate 17 is rotatably arranged on one side of the solid filter screen 13. An electric push rod 18 is arranged on the pretreatment box 11. The piston rod of the electric push rod 18 is rotatably connected with the end portion of the discharge door plate 17. The solid filter screen 13 is arranged in an inclined manner. The inclination angle can be set to 30-45°. The solid filter screen 13 arranged in an inclined manner can make the fixed filter material move along the filter screen to the discharge door plate 17, facilitating the subsequent discharge of the solid filter material and the cleaning of the solid filter screen 13 through the discharge door plate 17.

[0035] The waste liquid evaporation box 2 is arranged at the bottom of the condensation box 4. The waste liquid evaporation box 2 is used for evaporating the acidic gas and the alkaline gas in the waste liquid. A plurality of heating parts 21 are arranged in the waste liquid evaporation box 2. The heating part 21 comprises a plurality of arrayed electric heating rods. One end of an evaporation discharge pipe 6 is communicated with one side of the waste liquid evaporation box 2. The other end of the evaporation discharge pipe 6 is communicated with the top of the condensation box 4. The electric heating rods are used for heating. The chemical waste liquid is heated and evaporated. The waste liquid vapor is transported to the condensation box 4 through the evaporation discharge pipe 6.

[0036] The descaling mechanism 3 is arranged in the waste liquid evaporation box 2. The descaling mechanism 3 is used for removing the scale on the heating part 21. During the evaporation of the waste liquid, the minerals or other dissolved substances in the waste liquid will deposit during the heating process, forming scale and accumulating on the heating part 21. Especially under high temperature, the scale will seriously affect the heating efficiency.

[0037] The descaling mechanism 3 comprises a descaling rod 31 installed at the bottom of a vibrating seat 32, a vibrating motor arranged in the vibrating seat 32 to drive the descaling rod 31 to vibrate, a lifting piece 33 arranged at the top of the vibrating seat 32 to drive the descaling rod 31 to move, the lifting piece 33 can be an oil cylinder or a gas cylinder, a cleaning piece 34 arranged at the bottom of the descaling rod 31, a rotating groove 35 formed at the bottom of the descaling rod 31, the cleaning piece 34 rotatably arranged in the rotating groove 35, the cleaning piece 34 comprising a cleaning seat 36, a brush surface 37 arranged at the bottom of the cleaning seat 36, the cleaning seat 36 rotatably installed on the rotating groove 35 through a fixing column, a limiting groove 38 arranged at the two sides of the cleaning seat 36, an elastic piece 39 arranged in the limiting groove 38, one end of the elastic piece 39 installed on the inner wall of the rotating groove 35, the other end abutting against the limiting seat of the cleaning seat 36, the elastic piece 39 used for limiting the rotation of the cleaning seat 36, and the elastic piece 39 used for buffering the contact pressure between the brush surface 37 of the cleaning seat 36 and the heating piece 21 when the descaling rod 31 rotates, the elastic piece 39 being a spring;

[0038] The lifting piece 33 is installed at the bottom of an end seat rotatably installed on the waste liquid evaporation tank 2, and a rotating motor is arranged on the waste liquid evaporation tank 2 to drive the end seat to rotate. When the descaling rod 31 is rotated by the rotating motor to contact the surface of the heating piece 21 and wash the scale deposited on the surface of the heating piece 21 by the brush surface 37, the cleaning piece 34 on the descaling rod 31 is vibrated by the vibrating motor to accelerate the separation between the scale and the heating piece 21, so that the cleaning efficiency is higher. When the descaling rod 31 is parallel to the electric heating rod, the descaling rod 31 is moved between the groups of heating pieces 21 arranged in parallel by the lifting piece 33 to clean the different groups of heating pieces 21 respectively, so that the scale layer is avoided to be formed by the deposition of the surface of the heating piece 21, the heating efficiency in the waste liquid evaporation tank 2 is affected, the formation of the deposition is minimized, the evaporation efficiency is improved, and the service life of the equipment is prolonged.

[0039] During evaporation, the descaling rod 31 is rotated to drive the waste liquid to rotate, so that the waste liquid is more uniformly heated, the contact area between the waste liquid and the gas is increased, the evaporation of the waste liquid is accelerated, and the deposition of the scale during evaporation is reduced.

[0040] The condensing box 4 is provided with a condensing coil 41 filled with coolant. The condensing box 4 is provided with an input pipe 42 for inputting coolant and an output pipe 43 for discharging coolant. The input pipe 42 and the output pipe 43 are respectively communicated with both ends of the condensing coil 41. The coolant is supplied into the condensing coil 41 through the input pipe 42 to cool the condensing coil 41. The steam in the condensing box 4 exchanges heat with the condensing coil 41 to reduce the temperature of the steam, so that the steam is re-liquefied to form the required acidic solution or alkaline solution. The output pipe 43 is used to discharge the coolant after heat exchange to continuously cool the steam. The condensing box 4 is provided with an exhaust pipe on one side and a liquid discharge pipe 44 at the bottom. The liquid discharge pipe 44 is used to discharge the re-liquefied solution to realize the resource utilization of the chemical waste liquid.

[0041] The condensing box 4 is provided with a spraying mechanism 5 on the top. The spraying mechanism 5 includes a plurality of spraying pipes 51 provided with a plurality of spraying heads 52. The plurality of spraying pipes 51 are communicated with a water supply pipe 53. The cooling water is supplied into the water supply pipe 53 to be sprayed into the condensing box 4 through the spraying pipes 51 and combined with the steam to reduce the temperature of the steam and accelerate the condensation of the steam.

[0042] The working principle is as follows:

[0043] The chemical waste liquid flows into the pretreatment box 11 through the liquid inlet pipe 12. After being adjusted to the set pH value by the pH adjusting piece 14 and filtered through the solid filter screen 13 to remove the solid substances in the waste liquid, the waste liquid flows into the waste liquid evaporation box 2. A plurality of heating pieces 21 are synchronously heated to evaporate the waste liquid. The rotating motor drives the end seat to rotate, and the rotatable descaling rod 31 drives the waste liquid to rotate. The waste liquid is uniformly heated, the contact area between the waste liquid and the gas is increased, the evaporation of the waste liquid is accelerated, and the deposition of the waste liquid on the heating piece 21 is reduced.

[0044] The evaporated gas is transported into the condensing box 4 through the evaporation exhaust pipe 6. When the steam passes through the cooling coil, the steam exchanges heat with the coolant in the cooling coil to reduce the temperature of the steam. At the same time, the spraying heads 52 on the plurality of spraying pipes 51 spray cooling water into the condensing box 4. The cooling water combines with the steam to further reduce the temperature of the steam and accelerate the liquefaction of the steam. The acidic solution or alkaline solution formed by the liquefaction falls into the bottom of the condensing box 4 and is discharged from the liquid discharge pipe 44 for recycling.

[0045] Example 2

[0046] Referring to Figures 1-6 Fig. 1, a chemical waste liquid resource utilization evaporation type condenser includes a waste liquid pretreatment mechanism 1, a waste liquid evaporation box 2, a descaling mechanism 3, a condensing box 4, a spraying mechanism 5, and a controller 7.

[0047] The waste liquid pretreatment mechanism 1 is arranged on one side of the waste liquid evaporation box 2, and is used for pretreating the chemical waste liquid to ensure the efficiency during evaporation and condensation.

[0048] The waste liquid evaporation box 2 is arranged at the bottom of the condensation box 4, and is used for evaporating the acid gas and the alkaline gas in the waste liquid.

[0049] The descaling mechanism 3 is arranged in the waste liquid evaporation box 2, and is used for removing the scale on the heating element 21.

[0050] The descaling mechanism 3 comprises a descaling rod 31, which is arranged at the bottom of a vibrating seat 32.

[0051] The condensing box 4 is provided with a condensing coil 41 filled with a coolant, and an input pipe 42 and an output pipe 43 for forming a loop of the coolant are arranged on one side of the condensing box 4, and a liquid discharge pipe 44 is further arranged at the bottom of the condensing box 4 for discharging the re-liquefied solution.

[0052] The condensing box 4 is provided with a spraying mechanism 5 at the top, which comprises a plurality of spraying pipes 51 provided with a plurality of spraying heads 52, and the spraying pipes 51 are communicated with a water supply pipe 53.

[0053] On the basis of the embodiment 1, a controller 7 is arranged on one side of the pretreatment box 11, which is used for real-time control of the pH value of the chemical waste liquid. Since the pH value of the chemical waste liquid is usually not kept unchanged but fluctuates or changes with the influence of various factors in the process of continuous output of the chemical waste liquid, the factors include continuous chemical reaction, dynamic change of waste liquid composition, operation condition, etc. Therefore, the pH value of the chemical waste liquid needs to be dynamically adjusted by the controller 7 to achieve stable evaporation effect.

[0054] Dynamic control process of the controller 7 for adjusting the pH value of the waste liquid:

[0055] The pH value of the chemical waste liquid in the pretreatment box 11 is monitored at any time by the PH test probe 15, and the hydrogen ion concentration difference is calculated by comparing the pH value of the chemical waste liquid with the set target pH value, so as to obtain the hydrogen ion concentration difference, i.e. the concentration of hydrogen ions that needs to be adjusted.

[0056] According to the flow rate of the chemical waste liquid and the volume of the waste liquid contained in the pretreatment box 11, the residence time of the waste liquid in the pretreatment box 11 is calculated, and the number of moles of the adjusting agent that needs to be added is calculated by using the addition amount formula, so as to change the hydrogen ion concentration to the set target pH value. The adjusting agent is an acid or a base.

[0057] Addition amount formula Wherein, n add is the number of moles of the adjusting agent that needs to be added, △[H + ](t) is the concentration of hydrogen ions that needs to be adjusted, V p is the volume of the waste liquid contained in the pretreatment box 11.

[0058] The rate of the adjusting agent that needs to be added is calculated by using the adjusting agent addition formula Wherein, R add (t) is the addition rate of the adjusting agent, n add is the number of moles of the adjusting agent that needs to be added, C add is the molar concentration of the adjusting agent, Q(t) is the flow rate of the waste liquid in the pretreatment box 11, V p is the volume of the waste liquid contained in the pretreatment box 11, and a is a preset proportional coefficient, which is 0.896.

[0059] The evaporation condition in the waste liquid evaporation tank 2 is judged, and the evaporation value is calculated by using the difference of the additive rate of the adjusting agent and the difference of the concentration of hydrogen ions at different times, and the evaporation value formula is Wherein, R add (t1) and R add (t2) are the additive rates of the adjusting agent at t1 and t2 respectively, And The difference of the concentration of hydrogen ions at t1 and t2 respectively, and β is a preset proportional coefficient, which is 1.165.

[0060] When the evaporation value is less than the preset evaporation threshold value, it is determined that the waste liquid evaporation efficiency in the waste liquid evaporation tank 2 is low, and the cleaning instruction is executed on the heating element 21 in the waste liquid evaporation tank 2 by using the descaling mechanism 3.

[0061] When the evaporation value is greater than or equal to the preset evaporation threshold value, it is determined that the waste liquid in the waste liquid evaporation tank 2 is normally evaporated.

[0062] In the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] The above has described one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. An evaporative condenser for resource utilization of chemical waste liquid, characterized in that, The utility model relates to a chemical waste liquid evaporating device, including: waste liquid pretreatment mechanism, waste liquid pretreatment mechanism sets up in waste liquid evaporation tank one side, waste liquid pretreatment mechanism is used for carrying out acid -base neutralization and filtration treatment to chemical waste liquid, ensure the high efficiency when evaporating and condensing; Waste liquid evaporation tank, the waste liquid evaporation tank is arranged at the bottom of the condensing tank, and the waste liquid evaporation tank is used for evaporating acid gas and alkaline gas in the waste liquid;The waste liquid evaporation tank is provided with a plurality of heating elements, and the heating element is composed of a plurality of arrayed electric heating rods; The waste liquid evaporation tank side is communicated with the evaporation exhaust pipe one end, and the other end of the evaporation exhaust pipe is communicated with the top of the condensing tank; Descale mechanism, the descale mechanism is arranged in the waste liquid evaporation tank, and the descale mechanism is used for removing the scale on the heating element;The descale mechanism includes a descale rod, the descale rod is installed at the bottom of the vibration seat, the vibration motor is arranged in the vibration seat, the vibration motor drives the descale rod to vibrate, the lifting element is arranged at the top of the vibration seat, the lifting element drives the descale rod to move, the descale rod is provided with a rotating groove at the bottom, the descale rod is provided with a cleaning element, the cleaning element is rotatably arranged in the rotating groove, the cleaning element includes a cleaning seat, the cleaning seat is provided with a brush surface at the bottom, the cleaning seat is provided with a limiting groove at both sides, the limiting groove is provided with an elastic element, one end of the elastic element is installed in the inner wall of the rotating groove, the other end of the elastic element is in abutting engagement with the limiting seat of the cleaning seat, the lifting element is installed at the bottom of the end seat, the end seat is rotatably installed on the waste liquid evaporation tank, the waste liquid evaporation tank is provided with a rotating motor for driving the end seat to rotate; Condensing tank, the condensing tank is provided with a condensing coil, the condensing coil is filled with coolant, the top of the condensing tank is provided with a spraying mechanism, the spraying mechanism includes a plurality of spraying pipes, the spraying pipes are provided with a plurality of spraying heads, the spraying pipes are communicated with the water supply pipe, the cooling water is supplied into the water supply pipe, and the cooling water is sprayed into the condensing tank through the spraying pipe, the cooling water is combined with the steam to accelerate the liquefaction of the steam; The waste liquid pretreatment mechanism includes a pretreatment tank, the pretreatment tank is communicated with the waste liquid evaporation tank, one side of the pretreatment tank is provided with a liquid inlet pipe communicated with the chemical waste liquid, the pretreatment tank is provided with a solid filter screen, the solid filter screen is arranged obliquely, and the oblique angle is 30-45°, a pH adjusting element is arranged above the solid filter screen; The pH adjusting element includes a pH test probe and a pH dosing port, the pH test probe detects the pH value of the chemical waste liquid in the pretreatment tank, and the pH dosing port is used for adding acid and alkali to neutralize the pH value of the waste liquid; One side of the waste liquid pretreatment mechanism is provided with a controller, and the controller is used for real-time control of the pH value of the chemical waste liquid in the pretreatment tank of the waste liquid pretreatment mechanism.

2. The evaporative condenser for resource utilization of chemical waste liquid according to claim 1, characterized in that, One side of the pretreatment tank is rotatably installed with a discharge door plate, the discharge door plate is arranged on one side of the solid filter screen, and the pretreatment tank is provided with an electric push rod, and the piston rod of the electric push rod is rotatably connected with the end of the discharge door plate.

3. The evaporative condenser for resource utilization of chemical waste liquid according to claim 1, characterized in that, The cleaning seat is rotatably installed on the rotating groove through the fixing column.

4. The evaporative condenser for resource utilization of chemical waste liquid according to claim 1, characterized in that, The condensing box is provided with an input pipe and an output pipe on one side, the input pipe and the output pipe are communicated with two ends of the condensing coil respectively, and the bottom of the condensing box is provided with a liquid discharge pipe for discharging the re-liquefied solution.

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