Evaporative condenser for resource utilization of chemical waste liquid

Abstract

The invention discloses an evaporative condenser for resource utilization of chemical waste liquid, and belongs to the technical field of waste liquid treatment. The device comprises a waste liquid pretreatment mechanism, the waste liquid pretreatment mechanism is arranged on one side of a waste liquid evaporation box, and the waste liquid pretreatment mechanism is used for carrying out acid-base neutralization and filtration treatment on chemical waste liquid to ensure high efficiency during evaporation and condensation; solid impurities in chemical waste liquid are filtered and the pH value of the chemical waste liquid is adjusted through the waste liquid pretreatment mechanism, the chemical waste liquid is adjusted to the optimal evaporation condition, the pH value is dynamically adjusted through the controller on one side of the waste liquid pretreatment mechanism, and the evaporation condition of the waste liquid is judged; chemical waste liquid is evaporated through the waste liquid evaporation box, the descaling mechanism in the waste liquid evaporation box drives the waste liquid to rotate to accelerate evaporation of the waste liquid, meanwhile, accumulation of sediments on the surface of the heating piece is reduced, and cooling and liquefaction of steam are accelerated through heat exchange of a condensing coil of the condensing box and water vapor spraying of the spraying mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of waste liquid treatment, and more specifically, to an evaporative condenser for resource utilization of chemical waste liquid. Background Art

[0002] Evaporative condensers are widely used in the chemical industry, especially in chemical reactions, distillation, gas cooling and other processes, where efficient heat management is essential. Due to its efficient heat exchange and energy-saving characteristics, evaporative condensers have become important cooling equipment in many chemical production processes. In some chemical processes, acid and alkaline waste liquids are common by-products. Some components in acidic or alkaline waste liquids can be recovered through evaporation and condensation processes. For example, volatile acidic gases, such as hydrogen chloride and sulfuric acid mist, can be condensed through evaporative condensers to restore acidic liquids, or neutralized and reused through subsequent treatment; in this way, it not only helps to reduce waste liquid emissions, but also improves the reuse rate of resources and reduces pollutant emissions from waste liquids, achieving the dual goals of environmental protection and resource reuse.

[0003] In existing chemical waste liquid treatment equipment, since the chemical waste liquid contains minerals or other dissolved substances, they will be deposited during heating to form 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. At the same time, during the high-temperature evaporation process, the continuous accumulation of scale will affect the heating efficiency and even cause blockage of the heat exchanger. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide an evaporative condenser for resource utilization of chemical waste liquid.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

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

[0007] The waste liquid pre-treatment mechanism is arranged on one side of the waste liquid evaporation tank, and is used to neutralize and filter the chemical waste liquid to ensure high efficiency during evaporation and condensation;

[0008] A waste liquid evaporation box, which is arranged at the bottom of the condensation box and is used to evaporate the acidic gas and alkaline gas in the waste liquid; a plurality of groups of heating elements are arranged in the waste liquid evaporation box, and the heating elements are composed of a plurality of electric heating rods arranged in an array;

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

[0010] The descaling mechanism is arranged inside the waste liquid evaporation box, and the descaling mechanism is used to remove scale on the heating element; the descaling mechanism includes a descaling rod, the descaling rod is installed at the bottom of the vibration seat, a vibration motor is arranged in the vibration seat to drive the descaling rod to vibrate, a lifting member is arranged on the top of the vibration seat to drive the descaling rod to move, a rotating groove is opened at the bottom of the descaling rod, a cleaning member is arranged at the bottom of the descaling rod, and the cleaning member is rotatably arranged in the rotating groove, and the cleaning member includes a cleaning seat, a brush surface is arranged at the bottom of the cleaning seat, limiting grooves are arranged on both sides of the cleaning seat, an elastic member is arranged in the limiting groove, one end of the elastic member is installed on the inner wall of the rotating groove, and the other end is abutted and matched with the limiting seat of the cleaning seat, the lifting member is installed at the bottom of the end seat, the end seat is rotatably installed on the waste liquid evaporation box, and a rotating motor that drives the end seat to rotate is arranged on the waste liquid evaporation box;

[0011] A condensation box is provided with a condensation coil in the condensation box, and the condensation coil is filled with a coolant.

[0012] As a further solution of the present invention, the waste liquid pretreatment mechanism includes a pretreatment box, which is connected to the waste liquid evaporation box. A liquid inlet pipe connected to the chemical waste liquid is arranged on one side of the pretreatment box. A solid filter screen is arranged in the pretreatment box. The solid filter screen is inclined and its inclination angle can be set to 30-45°. A PH adjustment component is arranged above the solid filter screen.

[0013] As a further solution of the present invention, the PH adjusting component 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 box, and the PH dosing port is used to add acid and alkali to neutralize the pH value of the waste liquid.

[0014] As a further solution of the present invention, a discharge door plate is rotatably installed on one side of the pre-processing box, and the discharge door plate is arranged on one side of the solid filter screen. An electric push rod is arranged on the pre-processing box, and the piston rod of the electric push rod is rotatably connected to the end of the discharge door plate.

[0015] As a further solution of the present invention, the cleaning seat is rotatably mounted on the rotating groove through a fixing column.

[0016] As a further solution of the present invention, an input pipe and an output pipe are provided on one side of the condensation box, and the input pipe and the output pipe are respectively connected to the two ends of the condensation coil. A drain pipe is provided at the bottom of the condensation box, and the drain pipe is used to discharge the reliquefied solution.

[0017] As a further solution of the present invention, a spray mechanism is provided on the top of the condensation box, and the spray mechanism includes a plurality of spray pipes, and a plurality of spray heads are provided on the spray pipes. The plurality of spray pipes are connected to a water supply pipe. Cooling water is supplied to the water supply pipe and sprayed into the condensation box through the spray pipes. The cooling water is combined with steam to accelerate the liquefaction of the steam.

[0018] As a further solution of the present invention, a controller is arranged on one side of the waste liquid pre-treatment mechanism, and the controller is used to control the pH value of the chemical waste liquid in the pre-treatment box of the waste liquid pre-treatment mechanism in real time.

[0019] Compared with the existing solutions, the present invention has the following beneficial effects:

[0020] The present invention uses a waste liquid pre-treatment mechanism to filter solid impurities in chemical waste liquid and adjust the pH value, adjust the chemical waste liquid to the best evaporation condition, and a controller on one side of the waste liquid pre-treatment mechanism realizes dynamic adjustment of the pH value and judges the evaporation status of the waste liquid; a waste liquid evaporation box is used to evaporate the chemical waste liquid, and a descaling mechanism in the waste liquid evaporation box drives the waste liquid to rotate to accelerate the evaporation of the waste liquid, while reducing the accumulation of sediments on the surface of the heating element, and through the heat exchange of the condensation coil of the condensation box and the water vapor spraying of the spraying mechanism, the cooling and liquefaction of the steam are accelerated, so as to realize the resource recovery and utilization of the chemical waste liquid;

[0021] The waste liquid pre-treatment mechanism uses a solid filter to filter and remove solid impurities in the waste liquid to prevent these solid particles from interfering with the evaporation process and clogging during condensation. The pH value of the chemical waste liquid in the pre-treatment box is detected by a PH test probe, and acid and alkali are added through the PH dosing port to neutralize the pH value of the waste liquid, thereby neutralizing the pH value of the chemical waste liquid and improving the evaporation efficiency of the chemical waste liquid;

[0022] The descaling rod on the descaling mechanism contacts the surface of the heating element and uses the brush surface to scrub the scale deposited on the surface of the heating element. The vibration motor is used to drive the cleaning element on the descaling rod to vibrate, thereby accelerating the separation between the scale and the heating element, and the cleaning efficiency is higher. At the same time, when the chemical waste liquid is evaporated, the descaling rod can be rotated, and the descaling rod drives the waste liquid to rotate so that the waste liquid is heated more evenly, increasing the contact area between the waste liquid and the gas, accelerating the evaporation of the waste liquid, and reducing the deposition of scale on the heating element during evaporation, thereby minimizing the formation of deposits, improving the evaporation efficiency and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic structural diagram of an evaporative condenser for resource utilization of chemical waste liquid.

[0024] Figure 2 It is a cross-sectional view of the waste liquid evaporation tank and the condensation tank in the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of the waste liquid pretreatment mechanism in the present invention.

[0026] Figure 4 It is a structural schematic diagram of the descaling mechanism in the present invention.

[0027] Figure 5 It is a schematic diagram of the structure of the cleaning element in the present invention.

[0028] Figure 6 This is a schematic diagram of the structure 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; 14. PH adjustment member; 15. PH test probe; 16. PH dosing port; 17. discharge door panel; 18. electric push rod; 2. waste liquid evaporation box; 21. heating member; 3. descaling mechanism; 31. descaling rod; 32. vibration seat; 33. lifting member; 34. cleaning member; 35. rotating groove; 36. cleaning seat; 37. brush surface; 38. limit groove; 39. elastic member; 4. condensation box; 41. condensation coil; 42. input pipe; 43. output pipe; 44. discharge pipe; 5. spray mechanism; 51. spray pipe; 52. spray head; 53. water supply pipe; 6. evaporation discharge pipe; 7. controller. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0031] Example 1

[0032] Reference Figure 1-Figure 5 As shown, the present invention is an evaporative condenser for resource utilization of chemical waste liquid, comprising a waste liquid pre-treatment mechanism 1, a waste liquid evaporation tank 2, a descaling mechanism 3, a condensation tank 4 and a spray mechanism 5.

[0033] The waste liquid pretreatment mechanism 1 is arranged on one side of the waste liquid evaporation tank 2. The waste liquid pretreatment mechanism 1 is used to pre-treat the chemical waste liquid to ensure high efficiency during evaporation and condensation. The waste liquid pretreatment mechanism 1 includes a pretreatment tank 11. The pretreatment tank 11 is connected to the waste liquid evaporation tank 2. A liquid inlet pipe 12 connected to the chemical waste liquid is arranged on one side of the pretreatment tank 11. A solid filter screen 13 is arranged in the pretreatment tank 11. The solid impurities in the waste liquid are filtered and removed by the solid filter screen 13 to prevent these solid particles from interfering with the evaporation process and clogging during condensation. A PH adjustment member 14 is arranged above the solid filter screen 13. The PH adjustment member 14 includes a PH test probe 15 and a PH dosing port 16. The pH value of the chemical waste liquid in the pretreatment tank 11 is detected by the PH test probe 15. Acid and alkali are added by using the PH dosing port 16 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), it is necessary to adjust the pH value to a range suitable for evaporation by dilution or neutralization treatment;

[0034] A discharge door panel 17 is rotatably installed on one side of the pre-treatment box 11, and the discharge door panel 17 is arranged on one side of the solid filter screen 13. An electric push rod 18 is arranged on the pre-treatment box 11, and the piston rod of the electric push rod 18 is rotatably connected to the end of the discharge door panel 17. The solid filter screen 13 is tilted, and its tilt angle can be set to 30-45°. The tilted solid filter screen 13 can make the fixed filter material move along the filter screen to the discharge door panel 17, which is convenient for the subsequent discharge of the solid filter material and the cleaning of the solid filter screen 13 through the discharge door panel 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 to evaporate the acidic gas and alkaline gas in the waste liquid. A plurality of groups of heating elements 21 are arranged in the waste liquid evaporation box 2. The heating element 21 is composed of a plurality of electric heating rods arranged in an array. One side of the waste liquid evaporation box 2 is connected to one end of the evaporation exhaust pipe 6, and the other end of the evaporation exhaust pipe 6 is connected to the top of the condensation box 4. The chemical waste liquid is heated and evaporated by the electric heating rod, and the waste liquid vapor is transported to the condensation box 4 through the evaporation exhaust pipe 6.

[0036] The descaling mechanism 3 is arranged inside the waste liquid evaporation tank 2. The descaling mechanism 3 is used to remove the scale on the heating element 21. When the waste liquid evaporates, the minerals or other dissolved substances in the waste liquid will be deposited during the heating process to form scale and accumulate on the heating element 21. Especially at high temperatures, the scale will seriously affect the heating efficiency.

[0037] The descaling mechanism 3 includes a descaling rod 31, which is installed at the bottom of a vibration seat 32. A vibration motor is provided in the vibration seat 32 to drive the descaling rod 31 to vibrate. A lifting member 33 is provided on the top of the vibration seat 32 to drive the descaling rod 31 to move. The lifting member 33 can be an oil cylinder or an air cylinder, etc. A cleaning member 34 is provided at the bottom of the descaling rod 31. A rotating groove 35 is provided at the bottom of the descaling rod 31. The cleaning member 34 is rotatably arranged in the rotating groove 35. The cleaning member 34 includes a cleaning seat 36. The bottom of the cleaning seat 36 is provided with a A brush surface 37 is provided, and the cleaning seat 36 is rotatably installed on the rotating groove 35 through a fixing column. Limiting grooves 38 are provided on both sides of the cleaning seat 36, and elastic members 39 are provided in the limiting grooves 38. One end of the elastic member 39 is installed on the inner wall of the rotating groove 35, and the other end is abutted and matched with the limiting seat of the cleaning seat 36. The elastic member 39 is used to limit the rotation of the cleaning seat 36. At the same time, the descaling rod 31 buffers the contact pressure between the brush surface 37 of the cleaning seat 36 and the heating element 21 when rotating. The elastic member 39 is a spring;

[0038] The lifting member 33 is installed at the bottom of the end seat, and the end seat is rotatably installed on the waste liquid evaporation box 2. The waste liquid evaporation box 2 is provided with a rotating motor that drives the end seat to rotate. When descaling the heating element 21, the rotating motor drives the end seat to rotate, and then drives the descaling rod 31 to rotate. The descaling rod 31 contacts the surface of the heating element 21 and uses the brush surface 37 to scrub the scale deposited on the surface of the heating element 21. The vibration motor drives the cleaning member 34 on the descaling rod 31 to vibrate. When cleaning, the separation between the scale and the heating element 21 is accelerated, and the cleaning efficiency is higher. At the same time, when the descaling rod 31 rotates to be parallel to the electric heating rod, the lifting member 33 is used to drive the descaling rod 31 to move between the multiple groups of heating elements 21 arranged up and down, and different groups of heating elements 21 are cleaned separately to avoid the accumulation of deposits on the surface of the heating element 21 to form a scaling layer, which affects the heating efficiency in the waste liquid evaporation box 2, minimizes the formation of deposits, improves the evaporation efficiency and extends the service life of the equipment;

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

[0040] A condensing coil 41 is arranged in the condensing box 4, and the condensing coil 41 is filled with a coolant. An input pipe 42 for inputting the coolant and an output pipe 43 for discharging the coolant are arranged on one side of the condensing box 4. The input pipe 42 and the output pipe 43 are respectively connected to the two ends of the condensing coil 41. The coolant is supplied to the condensing coil 41 through the input pipe 42, and the coolant cools 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 reliquefied to form the required acidic solution or alkaline solution. The output pipe 43 is used to discharge the coolant that has completed the heat exchange, so as to form a continuous cooling operation for the steam; an exhaust pipe is arranged on one side of the condensing box 4, and a drain pipe 44 is also arranged at the bottom of the condensing box 4. The drain pipe 44 is used to discharge the reliquefied solution to realize the resource utilization of chemical waste liquid.

[0041] A spray mechanism 5 is provided on the top of the condensation box 4. The spray mechanism 5 includes a plurality of spray pipes 51. A plurality of spray heads 52 are provided on the spray pipes 51. The plurality of spray pipes 51 are connected with a water supply pipe 53. By supplying cooling water into the water supply pipe 53, the water is sprayed into the condensation box 4 through the spray pipes 51 and combines with the steam to reduce the temperature of the steam and accelerate the condensation of the steam.

[0042] Here’s how it works:

[0043] The chemical waste liquid flows into the pre-treatment box 11 through the liquid inlet pipe 12, is adjusted to the set pH value by the pH adjusting element 14, and passes through the solid filter 13 to filter the solid matter in the waste liquid, and then flows into the waste liquid evaporation box 2. The multiple groups of heating elements 21 heat synchronously to evaporate the waste liquid. The end seat is driven to rotate by a rotating motor, and the waste liquid is driven to rotate by a rotatable descaling rod 31. While the waste liquid is heated evenly, the contact area between the waste liquid and the gas is increased, which accelerates the evaporation of the waste liquid and reduces the accumulation of sediment on the heating element 21 during evaporation.

[0044] The evaporated gas is transported to the condenser box 4 through the evaporation exhaust pipe 6. When the steam passes through the cooling coil, it exchanges heat with the coolant in the cooling coil to reduce the temperature of the steam. At the same time, the spray heads 52 on the multiple spray pipes 51 spray cooling water into the condenser 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 liquefaction falls to the bottom of the condenser box 4 and is discharged from the drain pipe 44 to recover the acidic solution or alkaline solution.

[0045] Example 2

[0046] Reference Figure 1-Figure 6 As shown, an evaporative condenser for resource utilization of chemical waste liquid includes a waste liquid pre-treatment mechanism 1, a waste liquid evaporation tank 2, a descaling mechanism 3, a condensation tank 4, a spray mechanism 5 and a controller 7.

[0047] The waste liquid pretreatment mechanism 1 is arranged on one side of the waste liquid evaporation tank 2. The waste liquid pretreatment mechanism 1 is used to pre-treat the chemical waste liquid to ensure high efficiency during evaporation and condensation. The waste liquid pretreatment mechanism 1 includes a pretreatment box 11. The pretreatment box 11 is connected to the waste liquid evaporation tank 2. A liquid inlet pipe 12 connected to 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. A PH adjustment component 14 is arranged above the solid filter screen 13. The PH adjustment component 14 includes a PH test probe 15 and a PH dosing port 16; a discharge door panel 17 is rotatably installed on one side of the pretreatment box 11. The discharge door panel 17 is 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 to the end of the discharge door panel 17, and the solid filter screen 13 is tilted.

[0048] The waste liquid evaporation box 2 is arranged at the bottom of the condensation box 4. The waste liquid evaporation box 2 is used to evaporate the acidic gas and alkaline gas in the waste liquid. A plurality of groups of heating elements 21 are arranged in the waste liquid evaporation box 2. The heating element 21 is composed of a plurality of electric heating rods arranged in an array. One side of the waste liquid evaporation box 2 is connected to one end of the evaporation exhaust pipe 6, and the other end of the evaporation exhaust pipe 6 is connected to the top of the condensation box 4.

[0049] The descaling mechanism 3 is arranged inside the waste liquid evaporation tank 2. The descaling mechanism 3 is used to remove the scale on the heating element 21. When the waste liquid evaporates, the minerals or other dissolved substances in the waste liquid will be deposited during the heating process to form scale and accumulate on the heating element 21. Especially at high temperatures, the scale will seriously affect the heating efficiency.

[0050] The descaling mechanism 3 includes a descaling rod 31, which is installed at the bottom of a vibration seat 32. A vibration motor is provided in the vibration seat 32 to drive the descaling rod 31 to vibrate. A lifting member 33 is provided on the top of the vibration seat 32 to drive the descaling rod 31 to move. The lifting member 33 can be an oil cylinder or an air cylinder, etc. A cleaning member 34 is provided at the bottom of the descaling rod 31. A rotating groove 35 is provided at the bottom of the descaling rod 31. The cleaning member 34 is rotatably arranged in the rotating groove 35. The cleaning member 34 includes a cleaning seat 36. A brush surface 37 is provided at the bottom of the cleaning seat 36. The cleaning seat 36 is rotatably installed on the rotating seat through a fixed column. On the groove 35, limiting grooves 38 are provided on both sides of the cleaning seat 36, and elastic members 39 are provided in the limiting grooves 38. One end of the elastic member 39 is installed on the inner wall of the rotating groove 35, and the other end is abutted and matched with the limiting seat of the cleaning seat 36. The elastic member 39 is used to limit the rotation of the cleaning seat 36. At the same time, the descaling rod 31 buffers the contact pressure between the brush surface 37 of the cleaning seat 36 and the heating element 21 when rotating. The elastic member 39 is a spring; the lifting member 33 is installed at the bottom of the end seat, and the end seat is rotatably installed on the waste liquid evaporation tank 2. A rotating motor that drives the end seat to rotate is provided on the waste liquid evaporation tank 2.

[0051] A condensing coil 41 is provided in the condensing box 4, and the condensing coil 41 is filled with a coolant. An input pipe 42 and an output pipe 43 for forming a coolant loop are provided on one side of the condensing box 4. A drain pipe 44 is also provided at the bottom of the condensing box 4, and the drain pipe 44 is used to discharge the reliquefied solution.

[0052] A spray mechanism 5 is disposed on the top of the condensation box 4 . The spray mechanism 5 includes a plurality of spray pipes 51 . A plurality of spray heads 52 are disposed on the spray pipes 51 . The plurality of spray pipes 51 are connected to a water supply pipe 53 .

[0053] On the basis of Example 1, the present invention sets a controller 7 on one side of the pretreatment box 11, and the controller 7 is used to control the pH value of the chemical waste liquid in real time. Since the pH value of the chemical waste liquid usually does not remain unchanged during the continuous production of the chemical waste liquid, but fluctuates or changes with the influence of various factors, such as the continuous progress of the chemical reaction, the dynamic change of the waste liquid composition, the operating conditions, etc.; therefore, it is necessary to dynamically adjust the pH value of the chemical waste liquid through the controller 7 to achieve a stable evaporation effect;

[0054] The dynamic control process of the controller 7 adjusting the pH value of the waste liquid:

[0055] The pH value of the chemical waste liquid in the pretreatment box 11 is constantly monitored by the pH test probe 15, and the difference in hydrogen ion concentration between the pH value of the chemical waste liquid and the set target pH value is calculated to obtain the hydrogen ion concentration difference, that is, the concentration of hydrogen ions 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 pre-treatment box 11, the residence time of the waste liquid in the pre-treatment box 11 is calculated, and the number of moles of the regulator to be added is calculated using the addition amount formula, so as to change the hydrogen ion concentration to the set target pH value; the regulator is an acid or a base;

[0057] Addition formula Among them, n add is the number of moles of regulator to be added, △[H + ](t) is the concentration of hydrogen ions that need to be adjusted, V p The volume of the waste liquid accommodated by the pre-treatment box 11;

[0058] The regulator addition formula is used to calculate the rate at which the regulator needs to be added. Among them, R add (t) is the rate of addition of the regulator, n add is the number of moles of regulator to be added, C add is the molar concentration of the regulator, Q(t) is the flow rate of the waste liquid in the pretreatment box 11, V p is the volume of waste liquid contained in the pre-treatment box 11, α is a preset proportional coefficient, and its value is 0.896;

[0059] Determine the evaporation status in the waste liquid evaporation box 2, and use the difference in the addition rate of the regulator at different times and the difference in the concentration of hydrogen ions to calculate the evaporation value. The evaporation value formula is Among them, R add (t1) and R add (t2) the addition rate of the regulator at time t1 and time t2, respectively, and The concentration difference of hydrogen ions at time t1 and time t2, β is the preset proportionality coefficient, and the value is 1.165;

[0060] When the evaporation value is less than the preset evaporation threshold, it is determined that the evaporation efficiency of the waste liquid in the waste liquid evaporation tank 2 is low, and the descaling mechanism 3 is used to execute a cleaning instruction on the heating element 21 in the waste liquid evaporation tank 2;

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

[0062] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An evaporative condenser for resource utilization of chemical waste liquid, characterized in that: include: A waste liquid pre-treatment mechanism (1), the waste liquid pre-treatment mechanism (1) is arranged on one side of the waste liquid evaporation tank (2), and the waste liquid pre-treatment mechanism (1) is used to perform acid-base neutralization and filtering treatment on the chemical waste liquid to ensure high efficiency during evaporation and condensation; A waste liquid evaporation box (2), the waste liquid evaporation box (2) is arranged at the bottom of the condensation box (4), and the waste liquid evaporation box (2) is used to evaporate the acidic gas and alkaline gas in the waste liquid; a plurality of groups of heating elements (21) are arranged in the waste liquid evaporation box (2), and the heating elements (21) are composed of a plurality of electric heating rods arranged in an array; One side of the waste liquid evaporation tank (2) is connected to one end of the evaporation exhaust pipe (6), and the other end of the evaporation exhaust pipe (6) is connected to the top of the condensation tank (4); A descaling mechanism (3), the descaling mechanism (3) being arranged inside the waste liquid evaporation tank (2), the descaling mechanism (3) being used to remove scale on the heating element (21); the descaling mechanism (3) comprising a descaling rod (31), the descaling rod (31) being mounted at the bottom of a vibration seat (32), a vibration motor being arranged inside the vibration seat (32) for driving the descaling rod (31) to vibrate, a lifting member (33) being arranged at the top of the vibration seat (32) for driving the descaling rod (31) to move, a rotating groove (35) being arranged at the bottom of the descaling rod (31), a cleaning member (34) being arranged at the bottom of the descaling rod (31), the cleaning member (34) is rotatably arranged in the rotating groove (35), the cleaning member (34) comprises a cleaning seat (36), a brush surface (37) is arranged at the bottom of the cleaning seat (36), limiting grooves (38) are arranged on both sides of the cleaning seat (36), an elastic member (39) is arranged in the limiting groove (38), one end of the elastic member (39) is mounted on the inner wall of the rotating groove (35), and the other end is abutted and matched with the limiting seat of the cleaning seat (36), the lifting member (33) is mounted on the bottom of the end seat, the end seat is rotatably mounted on the waste liquid evaporation box (2), and a rotating motor for driving the end seat to rotate is arranged on the waste liquid evaporation box (2); A condensation box (4), wherein a condensation coil (41) is arranged in the condensation box (4), and the condensation coil (41) is filled with a coolant.

2. The evaporative condenser for resource utilization of chemical waste liquid according to claim 1, characterized in that: The waste liquid pre-treatment mechanism (1) comprises a pre-treatment box (11), the pre-treatment box (11) is connected to the waste liquid evaporation box (2), a liquid inlet pipe (12) connected to the chemical waste liquid is arranged on one side of the pre-treatment box (11), a solid filter screen (13) is arranged in the pre-treatment box (11), the solid filter screen (13) is inclined, and its inclination angle can be set to 30-45 degrees, and a pH adjustment component (14) is arranged above the solid filter screen (13).

3. The evaporative condenser for resource utilization of chemical waste liquid according to claim 2, characterized in that: The pH adjusting component (14) comprises a pH test probe (15) and a pH dosing port (16). The pH test probe (15) detects the pH value of the chemical waste liquid in the pretreatment box (11), and the pH dosing port (16) is used to add acid or alkali to neutralize the pH value of the waste liquid.

4. The evaporative condenser for recycling chemical waste liquid according to claim 2, characterized in that: A discharge door plate (17) is rotatably mounted on one side of the pre-treatment box (11), and the discharge door plate (17) is arranged on one side of the solid filter screen (13). An electric push rod (18) is arranged on the pre-treatment box (11), and a piston rod of the electric push rod (18) is rotatably connected to the end of the discharge door plate (17).

5. The evaporative condenser for resource utilization of chemical waste liquid according to claim 1, characterized in that: The cleaning seat (36) is rotatably mounted on the rotating groove (35) via a fixing column.

6. The evaporative condenser for resource utilization of chemical waste liquid according to claim 1, characterized in that: An input pipe (42) and an output pipe (43) are provided on one side of the condensation box (4), and the input pipe (42) and the output pipe (43) are respectively connected to two ends of the condensation coil (41). A drain pipe (44) is provided at the bottom of the condensation box (4), and the drain pipe (44) is used to discharge the reliquefied solution.

7. The evaporative condenser for resource utilization of chemical waste liquid according to claim 1, characterized in that: A spray mechanism (5) is arranged on the top of the condensing box (4), and the spray mechanism (5) comprises a plurality of spray pipes (51). A plurality of spray heads (52) are arranged on the spray pipes (51). The plurality of spray pipes (51) are connected to a water supply pipe (53). By supplying cooling water into the water supply pipe (53) and spraying the cooling water into the condensing box (4) through the spray pipes (51), the cooling water is combined with steam to accelerate the liquefaction of the steam.

8. The evaporative condenser for resource utilization of chemical waste liquid according to claim 1, characterized in that: A controller (7) is provided on one side of the waste liquid pre-treatment mechanism (1), and the controller (7) is used to control the pH value of the chemical waste liquid in the pre-treatment box (11) of the waste liquid pre-treatment mechanism (1) in real time.

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