Waste liquid treatment method based on condensed water recovery

Abstract

In the field of waste liquid treatment, the invention provides a waste liquid treatment method based on condensed water recovery, and the method comprises a waste liquid pretreatment box, an atomizer, a heater, a gas purifier, a water condenser and an exhaust fan which are connected in sequence; the system further comprises an ice water machine. The method comprises the following steps: adding waste liquid into a waste liquid pretreatment box for pretreatment; the atomizer atomizes the pretreated waste liquid through air and an ultrasonic generator; the heater is used for heating the atomized mixed gas through the water chiller and then sending the atomized mixed gas to the gas purifier; the gas purifier is used for filtering, deacidifying and adsorbing the heated mixed gas in sequence; the water condenser condenses water vapor in the purified mixed gas into water through the ice water machine, the obtained dry air is discharged by the exhaust fan, the condensed water is discharged, and the system is compact in structure, small in occupied area and high in treatment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of waste liquid treatment, and in particular to a waste liquid treatment method based on condensed water recovery. Background Art

[0002] With the rapid development of science and technology, laboratories in universities, scientific research institutions and enterprises are constantly expanding, and the types, number and scale of laboratories are also growing. Along with this, the pollution problems brought by laboratories are also coming. Laboratory pollutants mainly include: solid waste, waste liquid, waste gas, noise and vibration, electromagnetic radiation, and biological pollutants of viruses and pathogenic bacteria. Waste from university laboratories is highly toxic and hazardous, but the environmental protection department has not included it in the environmental protection detection items. Even if it is included, it is difficult to detect due to its small amount and easy dilution by domestic sewage. Laboratory waste liquid mainly comes from the experimental research laboratories of various scientific research units and the scientific research and teaching laboratories of colleges and universities. Laboratory waste liquid has its own special properties, small amount, strong intermittent and high hazard. Laboratory waste liquid is mainly divided into two categories: organic waste liquid and inorganic waste liquid. Inorganic waste liquid mainly contains heavy metals, heavy metal complexes, acids and alkalis, cyanides, sulfides, halogen ions and other inorganic ions.

[0003] Direct discharge of inorganic waste liquid is very polluting to the environment, but it is not easy to regulate. The current situation is that inorganic waste liquid in many laboratories is diluted and directly discharged into the laboratory sewer and into the municipal pipeline, causing great harm to the environment.

[0004] At present, chemical methods are generally used to treat inorganic waste liquid. According to the composition of the waste liquid, chemicals are added to the waste liquid to make the components in the waste liquid react with the added chemicals to form precipitates. The precipitation is enhanced by adding flocculants, and then the waste liquid is treated by infiltration, filtration, disinfection, etc. The resulting reclaimed water is discharged into the municipal pipeline network, and sludge is also produced, which requires special treatment.

[0005] The chemical method of treating inorganic waste liquid is complex, occupies a large area, consumes a large amount of consumables, emits a pungent odor during the treatment process, and produces a large amount of sludge at the end of the treatment that is difficult to handle, resulting in low efficiency and high cost of the overall chemical treatment equipment, which is not suitable for treating waste liquid generated in the laboratory. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a waste liquid treatment method based on condensed water recovery. The condensed water recovered after treatment by this method can be recycled or discharged in compliance with the standards, the exhaust gas meets the emission standards, and only a small amount of solid slag is produced after the inorganic waste liquid is treated. This process system has a compact structure, a small footprint, high treatment efficiency, no need to add additional treatment agents, and low waste unit treatment costs, and can effectively treat laboratory inorganic waste liquid. Specifically including:

[0007] A waste liquid treatment method based on condensed water recovery, comprising a waste liquid pretreatment box, an atomizer, a heater, a gas purifier, a water condenser and an exhaust fan connected in sequence; and also comprising a water chiller;

[0008] The heating end of the water chiller is connected to the heater, the cooling end of the water chiller is connected to the water condenser, the heating end of the water chiller is a condenser, and the cooling end of the water chiller is an evaporator;

[0009] The method comprises the following steps:

[0010] S1, adding the waste liquid into the waste liquid pretreatment box for pretreatment to obtain pretreated waste liquid;

[0011] S2, the atomizer atomizes the pretreated waste liquid through air and an ultrasonic generator to obtain an atomized mixed gas;

[0012] S3, the heater heats the atomized mixed gas through a water chiller and then sends it to a gas purifier;

[0013] S4, the gas purifier sequentially filters, deacidifies and adsorbs the heated mixed gas to obtain a purified mixed gas;

[0014] S5. The water condenser condenses the water vapor in the purified mixed gas into water through the water chiller, and the obtained dry air is discharged by the exhaust fan, and the condensed water is discharged.

[0015] Optionally, the step of pouring the waste liquid into the waste liquid pretreatment tank for pretreatment in S1 to obtain the pretreated waste liquid includes:

[0016] Adding waste liquid into the waste liquid pretreatment tank through a waste liquid pump until the preset liquid level requirement is reached;

[0017] According to the pH value of the waste liquid, an acidic reagent or an alkaline reagent is added to the waste liquid through a reagent pump until the pH value of the waste liquid is equal to 7, thereby obtaining a pretreated waste liquid, wherein when the reagent is added to the waste liquid, compressed air is introduced into the waste liquid treatment box.

[0018] Optionally, the atomizer of S2 atomizes the pretreated waste liquid through air and an ultrasonic generator to obtain an atomized mixed gas comprising:

[0019] The pretreated waste liquid is transported to the atomizer by a waste liquid pump, wherein the delivery volume of the waste liquid pump is adjusted according to the liquid level meter data in the atomizer;

[0020] Opening the air inlet valve of the atomizer and adjusting the opening of the air inlet valve of the atomizer by using a negative pressure gauge in the atomizer, wherein the air inlet valve allows air to flow into the atomizer;

[0021] The ultrasonic generator in the atomizer is powered, and the waste liquid is atomized based on the air introduced by the air inlet valve and the vibration generated by the ultrasonic generator to obtain the atomized mixed gas.

[0022] Optionally, the heater in S3 heats the atomized mixed gas by a water chiller and then sends the mixed gas to a gas purifier, including:

[0023] The atomized mixed gas is sent to the air inlet of the heater through the exhaust port of the atomizer;

[0024] The hot air from the heating end of the ice machine enters the heat exchange tube in the heater through the air inlet of the heater, and the heat exchange tube heats the atomized mixed gas;

[0025] The heated mixed gas is sent to the gas purifier

[0026] Optionally, the gas purifier of S4 sequentially filters, deacidifies and adsorbs the heated mixed gas to obtain a purified mixed gas:

[0027] The mixed gas after heating and heating passes through the filter box, the deacidification box and the adsorption box in sequence to obtain the purified mixed gas.

[0028] Optionally, the filter box filters the heated mixed gas to remove particulate matter, salt and heavy metals in the heated mixed gas.

[0029] Optionally, the deacidification box deacidifies the heated mixed gas to remove acidic components in the heated mixed gas.

[0030] Optionally, the adsorption box adsorbs the heated mixed gas to remove heavy metals and VOCs organic gases in the heated mixed gas.

[0031] Optionally, the water condenser in S5 condenses water vapor in the purified mixed gas into water through the ice water machine, and the obtained dry air is discharged by the exhaust fan, and the condensed water is discharged, which includes:

[0032] The purified mixed gas enters the water condenser, the refrigeration end of the water chiller absorbs heat to reduce the temperature in the water condenser, and the water vapor in the purified mixed gas condenses into water, and the condensed water is discharged through the condensed water outlet of the water condenser.

[0033] Compared with the prior art, the above technical solution has at least the following beneficial effects:

[0034] The atomization of the present invention adopts ultrasonic atomization mode, which has low energy consumption, adopts a small lower section and a large upper section, is conducive to the evaporation of water, and is conducive to the uniform mixing of water vapor and air. The atomizer shell is welded to the atomizer head mounting plate, and the atomizer head is threaded to the atomizer head mounting plate. It can ensure that the waste liquid will not flow under the mounting plate, so that the waste liquid is completely isolated from the electrical components, and the safety of the electrical equipment is guaranteed. The negative pressure gauge controls the pressure in the atomizer, which can ensure that all the generated steam is taken away in time. The spray cleaner can regularly clean the atomizer head to ensure the atomization amount and atomization quality. The atomizer is flange-connected at the top and bottom, which is convenient for maintenance and repair of internal components.

[0035] The heating heat source of the heater of the present invention adopts the waste heat generated in the cold water preparation process, and no additional energy consumption is required. The heater adopts a shell-and-tube structure, the resistance of the heat exchange medium is small, and the energy consumption of air supply can be reduced. The heat exchange tube adopts an internal thread and external fin structure, which increases the unit heat exchange area and reduces the equipment volume.

[0036] The gas purifier of the present invention includes multiple boxes, and gas purification is carried out in stages. The filter box removes impurities such as particulate matter, salt, heavy metals, etc. in the gas, and the box is filled with filter materials such as glass fiber and composite materials. The deacidification box removes acidic components in the gas, and the box is filled with calcium-based and iron-based deacidification agents. The adsorption box removes harmful components such as heavy metals, VOCs organic gases, etc. in the gas, and the box is filled with porous media such as activated carbon.

[0037] The cooling ice water and the mixed gas in the water condenser of the present invention flow in the reverse direction, thereby increasing the heat exchange temperature difference and reducing the area of ​​the spiral heat exchange tube; corrosion of the spiral heat exchange tube is prevented by using corrosion-resistant materials such as stainless steel.

[0038] The evaporator and condenser in the ice machine of the present invention both adopt spiral coil heat exchange, and copper tubes with good heat exchange effect and easy processing are used as heat exchange tubes. The refrigerant of the present invention adopts environmentally friendly R290 or R410A with high refrigeration efficiency. The heat discharged by condensation of the refrigerant of the present invention is used to heat the mixed gas, so that energy is comprehensively utilized and the cost of waste liquid treatment is reduced.

[0039] The present invention can effectively remove harmful components such as various salts, heavy metals, etc. contained in inorganic waste liquid.

[0040] At room temperature, the water in the waste liquid of the present invention evaporates and becomes gas, the harmful components will not decompose, and the salt and heavy metals in the waste liquid are precipitated into solid particles and adsorbed by the purification device. The waste liquid is divided into three parts, most of which can be recycled water, a small part is discharged with the air in gaseous state, and the harmful solid components are adsorbed on the purification device, and other new pollutants that are difficult to treat are not generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 is a schematic diagram of the apparatus used in the method applied by the present invention;

[0043] Figure 2 It is a schematic diagram of the installation structure of the atomizer head of the present invention;

[0044] Figure 3 It is a schematic diagram of the mounting plate structure of the present invention;

[0045] Figure 4 It is a schematic diagram of the structure of the spray cleaning device of the present invention;

[0046] Figure 5 It is a top view and a front view of the heater of the present invention.

[0047] Marking Description:

[0048] 1. Waste liquid pretreatment box; 11. PH meter; 12. Liquid level controller; 2. Waste liquid delivery pump; 3. Atomizer; 31. Waste liquid inlet; 32. Atomizer shell; 33. Lower flange; 34. Ultrasonic generator; 35. Mounting plate; 36. Atomizer head; 37. Lower cover plate; 38. Power supply; 39. Liquid level meter; 310. Gas outlet; 311. Inlet valve; 312. Air inlet; 313. Spray cleaner; 3131. Water inlet pipe; 3132. Distribution pipe; 3133. Blocking plate; 3134. Spray pipe; 314. Upper cover plate ; 315, negative pressure gauge; 316, upper flange; 4, heater; 41, air inlet; 42, tube sheet; 43, heat exchange tubes in the heater; 44, panel; 45, air outlet; 46, air inlet; 5, gas purifier; 51, filter box; 52, deacidification box; 53, adsorption box; 6, water condenser; 61, water condenser shell; 62, heat exchange tubes in the water condenser; 63, condensate outlet; 7, exhaust fan; 8, water chiller; 81, circulating water pump; 82, evaporator; 83, compressor; 84, blower; 85, condenser. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0051] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0052] like Figure 1 As shown, a waste liquid treatment method based on condensed water recovery includes a waste liquid pretreatment box 1, an atomizer 3, a heater 4, a gas purifier 5, a water condenser 6 and an exhaust fan 7 which are sequentially connected; and also includes a water chiller 8;

[0053] The heating end of the water chiller 8 is connected to the heater 4 , and the cooling end of the water chiller 8 is connected to the water condenser 6 . The heating end of the water chiller 8 is the condenser 85 , and the cooling end of the water chiller 8 is the evaporator 82 .

[0054] The specific structure of the present invention is:

[0055] The ice machine 8 includes: a condenser 85, a blower 84, a compressor 83, an evaporator 82 and a circulating water pump 81;

[0056] The condenser 85 is connected to the heater 4, the blower 84 sends air into the condenser 85 and performs heat exchange in the condenser 85 to obtain hot air, and the condenser 85 transmits the hot air to the heater 4; the compressor 83 compresses the refrigerant into a high-temperature and high-pressure gas and transmits it to the condenser 85 for heat exchange with the air introduced by the blower 84, and then the refrigerant becomes a low-temperature and low-pressure liquid state and is transmitted to the evaporator 82, and the refrigerant exchanges heat with the liquid in the water condenser 6 in the evaporator 82; the two ends of the evaporator 82 are respectively connected to the two ends of the spiral heat exchange tube in the water condenser 6.

[0057] A pH meter 11 and a liquid level controller 12 are respectively arranged on the inner wall of the bottom of the waste liquid pretreatment box 1, and a waste liquid delivery pump 2 is arranged on the transmission pipeline of the waste liquid pretreatment box 1 and the atomizer 3; a waste liquid inlet pipeline and a reagent inlet pipeline are connected to the waste liquid pretreatment box 1; the waste liquid inlet pipeline is used to add the waste liquid to be treated into the waste liquid pretreatment box 1; the reagent inlet pipeline is used to add an acidic reagent or an alkaline reagent into the waste liquid pretreatment box 1.

[0058] The waste liquid pretreatment box 1 further comprises: a compressed air pipeline, which introduces compressed gas into the bottom of the inner cavity of the waste liquid pretreatment box 1 .

[0059] The atomizer 3 comprises: a spray washer 313, an atomizer housing 32, a liquid level meter 39, an ultrasonic generator 34, a power supply 38, an air inlet 312, an air outlet 310, a mounting plate 35 and an atomizing head 36; a waste liquid inlet 31 is arranged on the atomizer housing 32, and the waste liquid inlet 31 is connected to the waste liquid delivery pump 2, an upper flange 316 is welded to the top of the atomizer housing 32, a lower flange 33 is welded to the bottom of the atomizer housing 32, an upper cover plate 314 is mounted on the upper flange 316 by bolts, and a lower cover plate 37 is mounted on the lower flange 33 by bolts; the liquid level meter 39 is mounted in the inner cavity of the atomizer housing 32; the air inlet 312 is arranged on the atomizer housing 32; The air inlet 312 is provided with an air intake valve 311, and the air outlet is provided on the inner wall of the other side of the atomizer housing 32 and is communicated with the inner cavity of the atomizer housing 32; the ultrasonic generator 34 is installed on the lower cover plate 37 and is arranged in the cavity of the atomizer housing 32, and the pipeline of the ultrasonic generator 34 passes through the atomizer housing 32 and is connected to the power supply 38; the mounting plate 35 is welded on the inner wall of the atomizer housing 32 and is arranged above the ultrasonic generator 34, and a plurality of atomizer heads 36 are evenly arrayed and mounted on the mounting plate 35, and each of the atomizer heads 36 is respectively connected to the ultrasonic generator 34.

[0060] The spray washer 313 is installed on the top of the cavity of the atomizer housing 32; the spray washer 313 includes: an inlet pipe 3131, a distribution pipe 3132, a plugging plate 3133 and a spray pipe 3134; one end of the water inlet pipe 3131 passes through the upper cover plate 314 and is connected to the tap water pipeline, the other end of the water inlet pipe 3131 is connected to the distribution pipe 3132, and the plugging plate 3133 blocks the two ends of the spray distribution pipe; a plurality of the spray pipes 3134 are sequentially installed on the distribution pipe 3132, the spray pipe 3134 is a reducer, and the inlet end diameter of the spray pipe 3134 is larger than the outlet end diameter of the spray pipe 3134; the number of the spray pipes 3134 is equal to the number of the atomizing heads 36, each of the atomizing heads 36 is equipped with a spray pipe 3134, and the spray pipe 3134 is arranged directly above the corresponding atomizing head 36.

[0061] The air inlet 41 of the heater 4 is connected to the gas outlet 310 of the atomizer 3, and the air outlet 45 of the heater 4 is connected to the gas purifier 5; an air inlet 46 is arranged at the bottom of the heater 4, and the heat exchange tube 43 in the heater is connected to the condenser 85 through the air inlet 46; the heat exchange tube is an internal thread and external fin structure.

[0062] The gas purifier 5 includes a filter box 51, a deacidification box 52 and an adsorption box 53 which are arranged in sequence, and the gas introduced into the gas purifier 5 is filtered, deacidified and adsorbed in sequence. The heat exchange tube 62 in the water condenser is spirally arranged, and both ends of the heat exchange tube 62 in the water condenser are connected to both ends of the evaporator 82. A condensate outlet 63 is arranged at the bottom of the water condenser 6, and an exhaust fan 7 is arranged at the end of the water condenser away from the gas purifier 5. The refrigerant is R290 or R410a.

[0063] Based on the above device, the method comprises the following steps:

[0064] S1, adding the waste liquid into the waste liquid pretreatment box 1 for pretreatment to obtain pretreated waste liquid;

[0065] Adding waste liquid into the waste liquid pretreatment tank 1 through a waste liquid pump until the liquid level reaches a preset requirement;

[0066] According to the pH value of the waste liquid, an acidic reagent or an alkaline reagent is added to the waste liquid through a reagent pump until the pH value of the waste liquid is equal to 7, so as to obtain pretreated waste liquid, wherein when the reagent is added to the waste liquid, compressed air is introduced into the waste liquid treatment box.

[0067] S2, the atomizer 3 atomizes the pretreated waste liquid through air and an ultrasonic generator to obtain an atomized mixed gas;

[0068] The pretreated waste liquid is transported to the atomizer 3 by the waste liquid pump, wherein the delivery volume of the waste liquid pump is adjusted according to the data of the liquid level meter 39 in the atomizer 3;

[0069] Open the air inlet valve of the atomizer 3 and adjust the opening of the air inlet valve 311 of the atomizer 3 through the negative pressure gauge 315 in the atomizer 3, so that the air inlet valve 311 allows air to flow into the atomizer 3;

[0070] The ultrasonic generator 34 in the atomizer 3 is powered, and based on the air introduced by the air inlet valve 311 and the sound waves of a specific frequency generated by the ultrasonic generator 34, the waste liquid is atomized to obtain an atomized mixed gas.

[0071] S3, the heater 4 heats the atomized mixed gas through the ice water machine 8 and then sends it to the gas purifier 5;

[0072] The atomized mixed gas is sent to the air inlet 41 of the heater 4 through the exhaust port of the atomizer 3;

[0073] The hot air from the heating end of the ice water machine 8 enters the heat exchange tube 43 in the heater through the air inlet 46 of the heater 4, and the heat exchange tube heats the atomized mixed gas;

[0074] The heated mixed gas is sent to the gas purifier 5 .

[0075] S4, the gas purifier 5 sequentially filters, deacidifies and adsorbs the heated mixed gas to obtain a purified mixed gas;

[0076] The heated mixed gas passes through the filter box 51, the deacidification box 52 and the adsorption box 53 in sequence to obtain a purified mixed gas.

[0077] The filter box 51 filters the heated mixed gas to remove particulate matter, salt and heavy metals in the heated mixed gas.

[0078] The deacidification box 52 deacidifies the heated mixed gas to remove acidic components in the heated mixed gas.

[0079] The adsorption box 53 adsorbs the heated mixed gas to remove heavy metals and VOCs organic gas from the heated mixed gas.

[0080] S5, the water condenser 6 condenses the water vapor in the purified mixed gas into water through the ice water machine 8, and the obtained dry air is discharged by the exhaust fan 7, and the condensed water is discharged.

[0081] The purified mixed gas enters the water condenser 6 , the refrigeration end of the water chiller 8 absorbs heat to reduce the temperature in the water condenser 6 , and the water vapor in the purified mixed gas condenses into water, which is discharged through the condensed water outlet 63 of the water condenser 6 .

[0082] The principles and specific implementations of each device in this method are as follows:

[0083] In a specific implementation manner, the waste liquid pretreatment box 1 is mainly used to store waste liquid and pretreat the waste liquid. A pH meter 11 and a liquid level detector are connected inside.

[0084] In a specific implementation, the atomizer 3 mainly atomizes the waste liquid by ultrasonic waves to generate water vapor, which is introduced into the air to mix with the water vapor and take away the water vapor. The atomizer head 36 is sprayed and cleaned regularly.

[0085] like Figures 2 to 4 As shown, the lower section of the atomizer 3 is a square or circular structure, and the upper section is a flared structure. Overall, the lower section is small and the upper section is large.

[0086] The upper flange 316 and the lower flange 33 are welded to the atomizer housing 32, and are respectively connected to the upper cover plate 314 and the lower cover plate 37 by bolts, so as to facilitate disassembly and maintenance of internal components; the housing is also connected to the waste liquid inlet 31, the liquid level meter 39, the air inlet 312 and the gas outlet 310. The atomizer housing 32 is also welded to a mounting plate 35, and the mounting plate 35 is provided with several threaded holes for mounting the atomizer head 36. The bottom of the atomizer head 36 has an external thread, which can be directly connected to the thread of the mounting plate 35. The atomizer heads 36 are arranged in a staggered manner to fully atomize the waste liquid.

[0087] The upper cover plate 314 is connected to the spray washer 313 via the water inlet pipe 3131. The spray washer 313 includes a water inlet pipe 3131, a distribution pipe 3132, a blocking plate 3133 and a spray pipe 3134. Tap water enters the distribution pipe 3132 via the water inlet pipe 3131, and is sprayed onto the corresponding atomizing head 36 via the spray pipe 3134 to clean the atomizing head 36. The spray pipe 3134 is a reducer with a large diameter at the inlet end and a small diameter at the outlet end. It can generate a large impact force under a small water supply pressure, and has a good cleaning effect on the atomizing head 36.

[0088] The direction of the column is a schematic diagram of the structure of the mounting plate 35 Figure 3In the direction shown in the figure, each group of atomizing heads 36 is provided with a spray cleaning device 313, and each atomizing head 36 corresponds to a spray pipe 3134, and the spray pipe 3134 is directly opposite to the position of the atomizing head 36. It is ensured that each atomizing head 36 can be cleaned during cleaning. The spray pipe 3134 performs spray cleaning when the liquid level in the atomizer 3 is low. The spray cleaning devices 313 do not all work at the same time, but work in rotation in groups.

[0089] like Figure 5 As shown in a specific implementation manner, the heater 4 is mainly used to heat the mixed gas generated by the atomizer 3, increase the temperature of the mixed gas, and prevent the condensation and precipitation of water vapor in the mixed gas.

[0090] The specific structure of the heater 4 is the prior art, for example, it has two upper and lower panels 44 and two front and rear tube sheets 42, and the heat exchange tubes 43 in the heater are connected between the two tube sheets 42 to form a gas channel. The heat exchange tubes 43 in the heater extend out of the tube sheet by 0-5 mm, the front end of the gas channel is connected to the air inlet 41 and the air outlet 45, and the front tube sheet 42 is connected to the air inlet 46.

[0091] The mixed gas from the atomizer 3 enters the gas channel through the air inlet 41, and the hot air from the condenser 85 enters the heat exchange tube through the air inlet 46. The hot air in the heat exchange tube releases heat to heat the mixed gas in the gas channel. The cooled air is discharged through the heat exchange tube 43 in the heater, and the heated mixed gas enters the gas purifier 5 through the air outlet 45.

[0092] The heat exchange tube 43 in the heater adopts an internal thread and external fin structure to increase the unit heat exchange area and reduce the volume of the equipment.

[0093] In a specific implementation manner, the gas purifier 5 mainly purifies the heated mixed gas to remove harmful components such as particulate matter, salt, acidic gas, heavy metals, etc. in the mixed gas.

[0094] The gas purifier 5 includes three purification boxes, a filter box 51, a deacidification box 52, and an adsorption box 53. The gas purification is carried out in stages. First, the gas is filtered to remove impurities such as particulate matter, salt, and heavy metals in the gas; then the gas is deacidified to remove acidic components in the gas; and then the gas is adsorbed to remove heavy metals, VOCs organic gases, etc. in the gas. The specific structures and use principles of the filter box 51, the deacidification box 52, and the adsorption box 53 are prior art and will not be described in detail.

[0095] In a specific implementation mode, the water condenser 6 mainly condenses the purified mixed gas to separate out the moisture in the gas. A heat exchange tube is arranged in the water condenser shell 61, and the heat exchange tube 62 in the water condenser is connected to a condensate outlet 63. The condensed water is discharged and collected through the condensate outlet 63 to support recycling. The cooling ice water and the mixed gas flow in the opposite direction to increase the heat exchange temperature difference, which can reduce the area of ​​the spiral heat exchange tube.

[0096] In a specific implementation manner, the water chiller 8 actually follows the principles of Carnot cycle and reverse Carnot cycle, and generates cold water at a relatively low temperature to cool the mixed gas and precipitate the moisture in the mixed gas. At the same time, the heat generated heats the air and heats the mixed gas.

[0097] The ice machine 8 is composed of an evaporator 82, a condenser 85 and a compressor 83. The cooling water is circulated by a circulating water pump 81, and air is supplied by a blower 84.

[0098] The evaporator 82 and the condenser 85 both adopt a spiral coil heat exchange method, and use copper tubes with good heat exchange effect and easy processing as heat exchange tubes.

[0099] The specific working process of this method and the device involved in this method is as follows:

[0100] (1) Wastewater pretreatment

[0101] The waste liquid to be treated is added into the waste liquid pretreatment tank through the waste liquid pump, and the amount of waste liquid added is controlled by the liquid level controller.

[0102] pH meter 11 detects pH value of waste liquid:

[0103] a. No reagent is added when the pH value is between 6 and 8;

[0104] b. If the pH value is less than 6, add alkaline reagent to the waste liquid through the reagent pump until the pH is equal to 7;

[0105] c. If the pH value is greater than 8, add acidic reagent to the waste liquid through the reagent pump until the pH is equal to 7.

[0106] d. During the reagent addition process, continuously introduce compressed air to enhance the mixing of waste liquid and reagent and ensure that the pH value of the waste liquid is uniform.

[0107] (2) Waste liquid atomization

[0108] The pretreated waste liquid is delivered to the atomizer through the waste liquid delivery pump and the waste liquid inlet. The waste liquid delivery volume is controlled by the liquid level meter, the air inlet valve is opened, the exhaust fan is started, the value of the negative pressure gauge 315 is set, the opening of the air inlet valve is automatically adjusted, the atomizer power is turned on, the ultrasonic generator is powered, the ultrasonic generator generates high-frequency oscillations, the high-frequency oscillations are transmitted to the atomizing head, and the wastewater begins to atomize under the impact.

[0109] The principle is mainly: using ultrasonic directional pressure to make the liquid surface bulge, cavitation occurs around the bulging liquid surface, and the liquid is atomized into small molecular mist. Specifically, the ultrasonic atomizer uses electronic high-frequency oscillation (the oscillation frequency is 1.7MHz or 2.4MHz, which exceeds the human hearing range and is harmless to humans and animals) to break up the liquid water molecule structure through the high-frequency resonance of the atomizer head to produce a natural and elegant water mist.

[0110] The waste liquid is atomized to produce water mist, which moves upward and mixes with the air entering through the air inlet valve. Under the suction force of the exhaust fan, it is discharged through the exhaust port and enters the heater.

[0111] (3) Temperature rise of the mixed gas after atomization

[0112] The mixed gas enters the heater through the air inlet for heating to prevent the atomized water vapor from condensing and precipitating. The hot air required for heating comes from the condenser.

[0113] (4) Purification of mixed gas after atomization

[0114] The mixed gas enters the gas purifier for filtration, deacidification, adsorption and other treatments.

[0115] (5) Condensation of mixed gas after atomization

[0116] The purified mixed gas enters the water condenser for condensation. The water vapor in the gas condenses into water, which is collected and recycled. The cooling water required for condensation comes from the evaporator. The dry air that has been condensed and dehydrated is discharged through the exhaust fan.

[0117] (6) Heating and cooling of mixed gas

[0118] The energy required for heating and cooling the mixed gas is provided by the chiller.

[0119] When the refrigerant in the ice water machine changes its form, it is accompanied by an endothermic or exothermic reaction. The refrigerant absorbs heat when it changes from liquid to gas, and releases heat when it changes from gas to liquid.

[0120] After being compressed by the compressor, the refrigerant becomes a high-temperature and high-pressure gas, which enters the condenser and exchanges heat with the room-temperature air. The refrigerant releases heat and changes from gas to liquid, becoming a low-pressure and low-temperature liquid. At the same time, the incoming air absorbs heat and its temperature rises, turning into hot air. The hot air heats the mixed gas from the atomizer, and the temperature of the mixed gas rises. The air is provided by the blower.

[0121] The low-pressure and low-temperature liquid refrigerant enters the evaporator and exchanges heat with the warm water from the water condenser. The refrigerant absorbs heat and changes from a low-temperature and low-pressure liquid to a low-temperature and low-pressure gas. The temperature of the warm water decreases, generating ice water, which returns to the water condenser to cool the mixed gas. The low-temperature and low-pressure gaseous refrigerant returns to the compressor for compression and circulation.

[0122] The atomization of the present invention adopts ultrasonic atomization mode, which has low energy consumption, adopts a small lower section and a large upper section, is conducive to the evaporation of water, and is conducive to the uniform mixing of water vapor and air. The atomizer shell is welded to the atomizer head mounting plate, and the atomizer head is threaded to the atomizer head mounting plate. It can ensure that the waste liquid will not flow under the mounting plate, so that the waste liquid is completely isolated from the electrical components, and the safety of the electrical equipment is guaranteed. The negative pressure gauge controls the pressure in the atomizer, which can ensure that all the generated steam is taken away in time. The spray cleaner can regularly clean the atomizer head to ensure the atomization amount and atomization quality. The atomizer is flange-connected at the top and bottom, which is convenient for maintenance and repair of internal components.

[0123] The heating heat source of the heater of the present invention adopts the waste heat generated in the cold water preparation process, and no additional energy consumption is required. The heater adopts a shell-and-tube structure, the resistance of the heat exchange medium is small, and the energy consumption of air supply can be reduced. The heat exchange tube adopts an internal thread and external fin structure, which increases the unit heat exchange area and reduces the equipment volume.

[0124] The gas purifier of the present invention includes multiple boxes, and the gas purification is carried out in stages. The filter box removes impurities such as particulate matter, salt, and heavy metals in the gas. The box is filled with filter materials such as glass fiber and polymer materials, and the deacidification box removes acidic components in the gas. The box is filled with calcium-based and iron-based deacidifiers, and the adsorption box removes harmful components such as heavy metals and VOCs organic gases in the gas. The box is filled with porous media such as activated carbon.

[0125] The cooling ice water and the mixed gas in the water condenser of the present invention flow in the reverse direction, thereby increasing the heat exchange temperature difference and reducing the area of ​​the spiral heat exchange tube; corrosion of the spiral heat exchange tube is prevented by using corrosion-resistant materials such as stainless steel.

[0126] The evaporator and condenser in the ice machine of the present invention both adopt spiral coil heat exchange, and copper tubes with good heat exchange effect and easy processing are used as heat exchange tubes. The refrigerant of the present invention adopts environmentally friendly R290 or R410A with high refrigeration efficiency. The heat discharged by condensation of the refrigerant of the present invention is used to heat the mixed gas, so that energy is comprehensively utilized and the cost of waste liquid treatment is reduced.

[0127] The invention can effectively remove harmful components such as various salts, heavy metals and the like in inorganic waste liquid.

[0128] At room temperature, the water in the waste liquid of the present invention evaporates and becomes gas, the harmful components will not decompose, and the salt and heavy metals in the waste liquid are precipitated into solid particles and adsorbed by the purification device. The waste liquid is divided into three parts, most of which can be recycled water, a small part is discharged with the air in gaseous state, and the harmful solid components are adsorbed on the purification device, and other new pollutants that are difficult to treat are not generated.

[0129] The following points need to be explained:

[0130] (1) The drawings of the embodiments of the present invention only involve structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0131] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0132] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0133] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A waste liquid treatment method based on condensed water recovery, characterized in that: It includes a waste liquid pretreatment box, an atomizer, a heater, a gas purifier, a water condenser and an exhaust fan which are connected in sequence; it also includes a water chiller; The heating end of the water chiller is connected to the heater, the cooling end of the water chiller is connected to the water condenser, the heating end of the water chiller is a condenser, and the cooling end of the water chiller is an evaporator; The method comprises the following steps: S1, adding the waste liquid into the waste liquid pretreatment box for pretreatment to obtain pretreated waste liquid; S2, the atomizer atomizes the pretreated waste liquid through air and an ultrasonic generator to obtain an atomized mixed gas; S3, the heater heats the atomized mixed gas through a water chiller and then sends it to a gas purifier; S4, the gas purifier sequentially filters, deacidifies and adsorbs the heated mixed gas to obtain a purified mixed gas; S5. The water condenser condenses the water vapor in the purified mixed gas into water through the water chiller, and the obtained dry air is discharged by the exhaust fan, and the condensed water is discharged.

2. The waste liquid treatment method based on condensed water recovery according to claim 1 is characterized in that: The step S1 of adding the waste liquid into the waste liquid pretreatment tank for pretreatment to obtain the pretreated waste liquid includes: Adding waste liquid into the waste liquid pretreatment tank through a waste liquid pump until the preset liquid level requirement is reached; According to the pH value of the waste liquid, an acidic reagent or an alkaline reagent is added to the waste liquid through a reagent pump until the pH value of the waste liquid is equal to 7, so as to obtain pretreated waste liquid, wherein when the reagent is added to the waste liquid, compressed air is introduced into the waste liquid pretreatment box.

3. The waste liquid treatment method based on condensed water recovery according to claim 2 is characterized in that: The atomizer of S2 atomizes the pretreated waste liquid through air and an ultrasonic generator to obtain an atomized mixed gas comprising: The pretreated waste liquid is transported to the atomizer by a waste liquid pump, wherein the delivery volume of the waste liquid pump is adjusted according to the liquid level meter data in the atomizer; Opening the air inlet valve of the atomizer and adjusting the opening of the air inlet valve of the atomizer by using a negative pressure gauge in the atomizer, wherein the air inlet valve allows air to flow into the atomizer; The ultrasonic generator in the atomizer is powered, and based on the air introduced by the air inlet valve and the vibration generated by the ultrasonic generator, the waste liquid is atomized to obtain an atomized mixed gas.

4. The waste liquid treatment method based on condensed water recovery according to claim 3 is characterized in that: The heater of S3 heats the atomized mixed gas by a water chiller and then sends the mixed gas to a gas purifier, including: The atomized mixed gas is sent to the air inlet of the heater through the exhaust port of the atomizer; The hot air from the heating end of the ice machine enters the heat exchange tube in the heater through the air inlet of the heater, and the heat exchange tube heats the atomized mixed gas; The heated mixed gas is sent to the gas purifier.

5. The waste liquid treatment method based on condensed water recovery according to claim 4 is characterized in that: The gas purifier of S4 sequentially filters, deacidifies and adsorbs the heated mixed gas to obtain a purified mixed gas: The heated mixed gas passes through a filter box, a deacidification box and an adsorption box in sequence to obtain a purified mixed gas.

6. The waste liquid treatment method based on condensed water recovery according to claim 5 is characterized in that: The filter box filters the heated mixed gas to remove particulate matter, salt and heavy metals in the heated mixed gas.

7. The waste liquid treatment method based on condensed water recovery according to claim 5 is characterized in that: The deacidification box deacidifies the heated mixed gas to remove acidic components in the heated mixed gas.

8. The waste liquid treatment method based on condensed water recovery according to claim 5, characterized in that: The adsorption box adsorbs the heated mixed gas to remove heavy metals and VOCs organic gas in the heated mixed gas.

9. The waste liquid treatment method based on condensed water recovery according to claim 5, characterized in that: The water condenser of S5 condenses the water vapor in the purified mixed gas into water through the ice water machine, and the obtained dry air is discharged by the exhaust fan, and the condensed water is discharged, which includes: The purified mixed gas enters the water condenser, the refrigeration end of the water chiller absorbs heat to reduce the temperature in the water condenser, and the water vapor in the purified mixed gas condenses into water, and the condensed water is discharged through the condensed water outlet of the water condenser.

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