Recycled waste liquid recycling system

Abstract

The utility model discloses a recycling system for recycled waste liquid. The recycling system comprises a waste gas adsorption treatment unit, a separation recycling unit and a waste liquid treatment unit, the waste gas adsorption treatment unit is configured to adsorb organic waste gas; the separation and recovery unit is configured to separate and recover the recovery solvent generated by the waste gas adsorption treatment unit; the waste liquid treatment unit comprises a combustion chamber and a water supply unit; waste water generated by the waste gas adsorption treatment unit and waste liquid generated by the separation and recovery unit are sprayed into the combustion chamber through an atomizing nozzle and are combusted; the water supply unit is configured to provide combustion water into the combustion chamber, and heat generated by the combustion chamber heats the combustion water and generates saturated steam; and saturated steam flows to modules needing to be heated in the waste gas adsorption treatment unit and the separation and recovery unit through pipelines. According to the scheme, deep purification of organic waste gas and solvent resource regeneration can be achieved, meanwhile, a waste liquid energy treatment system is constructed, and the dual purposes of zero emission of pollutants and self-supply of energy are achieved.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid recycling technology, and in particular to a waste liquid recycling system. Background Technology

[0002] Currently, fixed-bed adsorption recovery technology is widely used in waste gas adsorption and recovery treatment. However, it has disadvantages such as long desorption time and high energy consumption, and the utilization rate of fixed beds is low when the waste gas concentration is low. To solve this problem, rotary adsorption recovery technology has emerged.

[0003] The application of rotary adsorption recovery technology to recover waste gas generates waste acid and wastewater with complex organic component content. Multi-stage recovery performance is low, and operating costs are increased. Biodegradation is relatively slow and cannot meet the treatment time requirements for some high-concentration or rapidly treated organic solvent waste liquids, and its degradation effect on specific substances is poor. There is an urgent need to develop co-treatment technologies for organic waste liquids to construct a complete treatment system encompassing "source reduction - high-efficiency purification - resource reuse" to mitigate environmental risks and promote the green transformation of the industry.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In response to the problems pointed out in the background art, this utility model proposes a waste liquid recycling system to achieve deep purification of organic waste gas and resource regeneration of solvents, while constructing a waste liquid energy treatment system to achieve the dual goals of zero pollutant emissions and energy self-sufficiency.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0007] In some embodiments of this application, a waste liquid recycling system is provided, comprising:

[0008] The waste gas adsorption treatment unit is configured to adsorb organic waste gas;

[0009] A separation and recovery unit is configured to separate and recover the recovered solvent generated by the waste gas adsorption treatment unit.

[0010] The waste liquid treatment unit includes:

[0011] The wastewater generated by the exhaust gas adsorption treatment unit and the waste liquid generated by the separation and recovery unit are sprayed into the combustion chamber through atomizing nozzles and burned.

[0012] A water supply unit is configured to supply combustion water to the combustion chamber, wherein the heat generated in the combustion chamber heats the combustion water and produces saturated steam;

[0013] The saturated steam flows through pipelines to the heating modules in the waste gas adsorption treatment unit and the separation and recovery unit.

[0014] In some embodiments of this application, the water supply unit includes an inlet pipe and a heat exchanger. The inlet pipe is connected to the combustion chamber, and the combustion chamber is connected to an exhaust pipe. The inlet pipe and the exhaust pipe exchange heat through the heat exchanger.

[0015] In some embodiments of this application, an oxygen content monitor is installed on the exhaust pipe.

[0016] In some embodiments of this application, the combustion chamber is connected to an air supply pipeline and a natural gas supply pipeline, and the air supply amount of the air supply pipeline and the natural gas supply amount of the natural gas supply pipeline are adjustable.

[0017] In some embodiments of this application, the combustion chamber includes a steam-water separator, the combustion chamber is connected to a steam discharge pipeline, and the saturated steam generated in the combustion chamber is separated by the steam-water separator before entering the steam discharge pipeline.

[0018] In some embodiments of this application, the wastewater generated by the exhaust gas adsorption treatment unit and the waste liquid generated by the separation and recovery unit are premixed by a mixer and then sprayed into the combustion chamber through an atomizing nozzle.

[0019] In some embodiments of this application, the waste gas adsorption treatment unit includes:

[0020] A rotating wheel, wherein multiple channel units for gas flow are provided on the rotating wheel, and the multiple channel units are distributed around the axis of the rotating wheel;

[0021] An exhaust gas pipeline is connected to at least one of the channel units, and the exhaust gas pipeline is configured to allow exhaust gas to flow through the corresponding channel unit for adsorption treatment.

[0022] A desorption circulation unit is connected to at least one of the channel units, and the desorption circulation unit is configured such that inert gas flows through the corresponding channel unit for desorption processing;

[0023] The desorption circulation unit is provided with a condenser, a gas-liquid separator and a heater in sequence along the gas flow direction. The gas outlet of the gas-liquid separator is connected to the heater through a pipeline, and the liquid outlet of the gas-liquid separator is connected to the separation and recovery unit through a pipeline. The steam flowing out of the combustion chamber flows to the heater through a pipeline.

[0024] In some embodiments of this application, the separation and recycling unit includes:

[0025] An evaporator is configured to evaporate and vaporize the flowing organic solvent;

[0026] A supergravity distillation bed, wherein the gas inlet of the supergravity distillation bed is connected to the gas outlet of the evaporator via a pipeline, and the liquid outlet of the supergravity distillation bed is connected to the first liquid inlet of the evaporator via a pipeline;

[0027] The circulation pipeline is connected at one end to the gas outlet of the supergravity distillation bed and at the other end to the reflux port of the supergravity distillation bed. A first condenser is installed on the circulation pipeline.

[0028] A membrane module is connected to the gas outlet of the supergravity distillation bed via a first pipeline. The membrane module is configured to dehydrate the flowing solvent to obtain the finished organic solvent.

[0029] The steam flowing out of the combustion chamber flows through a pipeline to the supergravity distillation bed.

[0030] In some embodiments of this application, a superheater is provided on the first pipeline, and the steam flowing out of the combustion chamber flows to the superheater through the pipeline.

[0031] In some embodiments of this application, an acid value meter is provided on the circulation pipeline, and the separation and recovery unit further includes a feed pipe assembly, which is configured to deliver recovered waste liquid to the evaporator or the high gravity distillation bed according to the acid value of the organic solvent.

[0032] Compared with the prior art, the advantages and positive effects of this utility model are:

[0033] In the waste liquid recycling system of this application, external water enters the combustion chamber to generate saturated steam. Part of the steam is used in the waste gas adsorption treatment unit, and part of the steam is used in the separation and recovery unit. This solution enables the system to achieve a steam self-sufficiency rate of over 70%, reduces energy consumption by more than 30% compared to traditional processes, and forms a complete ecological industrial chain of "waste gas purification - solvent regeneration - waste liquid energy conversion", achieving a synergistic improvement in environmental and economic benefits.

[0034] This system enables the recovery of waste gas, eliminating secondary pollution caused by adsorption and recovery.

[0035] This system recovers and utilizes waste heat through the waste liquid treatment unit, and provides heat energy to the waste gas adsorption treatment unit and the separation and recovery unit, further reducing energy consumption and operating costs.

[0036] This system can recover some valuable organic substances during the adsorption and recovery process. This process is in line with the concepts of energy conservation, environmental protection and green development, and realizes the recycling of resources.

[0037] The modular design adapts to different scales, and the adsorption and recovery, separation and dehydration, and wastewater treatment functions can be independently expanded to meet the needs of different waste gas industries.

[0038] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of a waste liquid recycling system according to some embodiments;

[0041] Figure 2 This is a schematic diagram of a separation and recycling unit according to some embodiments.

[0042] Figure label:

[0043] 9. Rotor; 11. Exhaust gas pipeline;

[0044] 100. Waste gas adsorption treatment unit; 110. Desorption circulation unit; 801. Condenser; 901. Gas-liquid separator; 120. Heater;

[0045] 600. Separation and recovery unit; 610. Feed pipe assembly; 611. First feed pipe; 612. Second feed pipe; 613. First control valve; 614. Second control valve; 615. Solvent pump; 620. Evaporator; 621. Waste liquid pump; 622. Balance pump; 630. High gravity distillation bed; 640. Circulation pipeline; 641. First condenser; 642. Acid value meter; 643. Reflux tank; 644. Reflux pump; 650. Membrane module; 660. First pipeline; 661. Fourth control valve; 662. Superheater; 670. Second pipeline; 671. Second condenser; 672. Regenerated solvent tank; 673. Moisture meter; 674. Product pump; 680. Third pipeline; 681. Third condenser; 682. Vacuum buffer tank; 683. Vacuum pump; 684. Wastewater pump;

[0046] 900 Waste liquid treatment unit; 910 Combustion chamber; 921 Water inlet pipe; 922 Heat exchanger; 930 Flue gas pipe; 940 Oxygen content monitor; 950 Mixer; 960 Steam-water separator; 971 Air supply pipe; 972 Natural gas supply pipe. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0053] In some embodiments of this application, a waste liquid recycling system is provided, referring to... Figure 1 This includes:

[0054] The waste gas adsorption treatment unit 100 is configured to adsorb organic waste gas; wastewater is generated during the treatment of organic waste gas by the waste gas adsorption treatment unit 100.

[0055] The separation and recovery unit 600 is configured to separate and recover the recovered solvent generated by the waste gas adsorption treatment unit 100; the separation and recovery unit 600 generates waste liquid during the process of separating and recovering the recovered solvent.

[0056] The waste liquid treatment unit 900 is configured to burn the wastewater generated by the waste gas adsorption treatment unit 100 and the waste liquid generated by the separation and recovery unit 600 to generate saturated steam. The heat of the saturated steam is used to provide heat to the modules in the waste gas adsorption treatment unit 100 and the separation and recovery unit 600 that require heating, thus forming a closed-loop recovery process. This achieves deep purification of industrial organic waste gas and resource regeneration of solvents, while also constructing a waste liquid energy treatment system, achieving the dual goals of zero pollutant emissions and energy self-sufficiency.

[0057] Specifically, the waste liquid treatment unit 900 includes a combustion chamber 910. Wastewater generated by the waste gas adsorption treatment unit 100 and waste liquid generated by the separation and recovery unit 600 are sprayed into the combustion chamber 910 through an atomizing nozzle and burned.

[0058] The wastewater treatment unit 900 also includes a water supply unit. The water supply unit is configured to supply combustion water to the combustion chamber 910, whereby the heat generated by the combustion chamber 910 heats the combustion water and produces saturated steam.

[0059] Saturated steam flows through pipelines to the modules in the waste gas adsorption treatment unit 100 and the separation and recovery unit 600 that require heating, so as to provide the heat required for heating these modules.

[0060] In the waste liquid recycling system of this application, external water enters the combustion chamber 910, generating saturated steam at 1.6 MPa. This steam is then separated into high-dryness steam by the steam-water separator 960. 80% of the generated steam is used in the waste gas adsorption treatment unit 100, and 20% is used in the separation and recovery unit 600. This solution enables the system to achieve a steam self-sufficiency rate of over 70%, reducing energy consumption by more than 30% compared to traditional processes. It forms a complete ecological industrial chain of "waste gas purification - solvent regeneration - waste liquid energy conversion," achieving a synergistic improvement in both environmental and economic benefits.

[0061] In some embodiments of this application, the water supply unit includes a water inlet pipe 921 and a heat exchanger 922. The water inlet pipe 921 is connected to the combustion chamber 910, and the combustion chamber 910 is connected to an exhaust pipe 930. The water inlet pipe 921 and the exhaust pipe 930 exchange heat through the heat exchanger 922.

[0062] Specifically, the flue gas generated during combustion in the combustion chamber 910 is discharged through the exhaust pipe 930, while external water flows into the combustion chamber 910 through the inlet pipe 921. The temperature of the exhaust pipe 930 is higher than that of the inlet water pipe, and the exhaust pipe 930 and the inlet water pipe 921 exchange heat through the heat exchanger 922. The external water is soft water. The heat exchanger 922 employs corrugated tube high-efficiency heat transfer technology to improve heat exchange efficiency.

[0063] The external water temperature rises after passing through heat exchanger 922, preheating it before entering combustion chamber 910, which helps improve combustion efficiency and steam generation efficiency. The flue gas temperature decreases after passing through heat exchanger 922 to meet emission standards.

[0064] In some embodiments of this application, the combustion chamber 910 is connected to an air supply line 971 and a natural gas supply line 972, the air supply amount of the air supply line 971 and the natural gas supply amount of the natural gas supply line 972 being adjustable. Air serves as combustion air, and the air and natural gas are ignited within the combustion chamber 910 by an electronic ignition system. Combustion efficiency is improved by adjusting the air-to-natural gas ratio.

[0065] In some embodiments of this application, an oxygen content monitor 940 is installed on the flue gas duct 930. The control system dynamically adjusts the ratio of natural gas to air and the amount of oxygen supplementation based on the detection data from the oxygen content monitor 940 to achieve complete combustion.

[0066] In some embodiments of this application, the combustion chamber 910 includes a steam-water separator 960, the combustion chamber 910 is connected to a steam discharge pipeline, and the saturated steam generated in the combustion chamber 910 is separated by the steam-water separator 960 before entering the steam discharge pipeline.

[0067] After passing through the steam-water separator 960, the saturated steam is separated into high-dryness steam, which then flows to the waste gas adsorption treatment unit 100 and the separation and recovery unit 600.

[0068] In some embodiments of this application, the wastewater generated by the exhaust gas adsorption treatment unit 100 and the waste liquid generated by the separation and recovery unit 600 are premixed by the mixer 950 and then sprayed into the combustion chamber 910 through the atomizing nozzle.

[0069] Premixing the wastewater generated by the exhaust gas adsorption treatment unit 100 and the waste liquid generated by the separation and recovery unit 600 through the mixer 950 helps to improve the complete combustion of the wastewater and waste liquid in the combustion chamber 910.

[0070] In some embodiments of this application, the waste gas adsorption treatment unit 100 includes:

[0071] Rotating wheel 9, on which multiple channel units for gas flow are provided, and the multiple channel units are distributed around the axis of the rotating wheel 9;

[0072] The exhaust gas duct 11 is connected to at least one of the channel units, and the exhaust gas duct 11 is configured to allow exhaust gas to flow through the corresponding channel unit for adsorption treatment.

[0073] Desorption circulation unit 110 is connected to at least one of the channel units, and the desorption circulation unit 110 is configured such that an inert gas (e.g., nitrogen) flows through the corresponding channel unit for desorption processing;

[0074] The desorption circulation unit 110 is provided with a condenser 801, a gas-liquid separator 901 and a heater 120 in sequence along the gas flow direction. The gas outlet of the gas-liquid separator 901 is connected to the heater 120 through a pipeline, and the liquid outlet of the gas-liquid separator 901 is connected to the separation and recovery unit 600 through a pipeline. The steam flowing out of the combustion chamber 910 flows to the heater 120 through a pipeline.

[0075] Specifically, as the rotor 9 continues to rotate, the channel units on the rotor 9 will alternately connect with the exhaust gas pipeline 11 and the desorption circulation unit 110. The channel unit connected with the exhaust gas pipeline 11 is defined as the adsorption channel unit, and the channel unit connected with the desorption circulation unit 110 is defined as the desorption channel unit.

[0076] Organic waste gas flows through the waste gas pipeline 11 and passes through the adsorption channel unit. The adsorption channel unit adsorbs the organic matter in the organic waste gas. After adsorption, the waste gas meets the emission standards and is discharged through the emission outlet.

[0077] As the rotor 9 rotates, the channel unit that has completed adsorption undergoes desorption. The inert gas circulates through the desorption channel unit via the desorption circulation unit 110 for cyclic desorption and regeneration. By using inert gas to circulate and desorb the rotor 9, the desorbed organic matter can be condensed and recovered. The inert gas can circulate through the desorption channel unit to achieve cyclic desorption.

[0078] The desorption circulation unit 110 is provided with a condenser 801, a gas-liquid separator 901 and a heater 120 arranged sequentially along the gas flow direction. The gas outlet of the gas-liquid separator 901 is connected to the heater 120 through a pipeline, and the liquid outlet of the gas-liquid separator 901 is connected to the separation and recovery unit 600 through a pipeline.

[0079] When the desorption circulation unit 110 uses inert gas to desorb the rotor 9, the inert gas flowing out of the desorption channel unit is at a high temperature. After being cooled and condensed by the condenser 801, it then passes through the gas-liquid separator 901 for gas-liquid separation. The separated gas is heated by the heater 120 and becomes a high-temperature gas. The high-temperature gas then circulates through the rotor 9 for desorption. The separated liquid enters the separation and recovery unit 600 for solvent separation and recovery.

[0080] Steam flowing out of combustion chamber 910 flows through pipeline to heater 120, providing heat to heater 120 and realizing heat recovery and utilization.

[0081] In some embodiments of this application, reference is made to Figure 2 The separation and recovery unit 600 is configured to separate and recover the organic solvents that have been desorbed from and condensed from the rotor 9 device.

[0082] The separation and recovery unit 600 includes an evaporator 620 configured to evaporate and vaporize the flowing organic solvent.

[0083] The separation and recovery unit 600 also includes a supergravity distillation bed 630, the gas inlet of which is connected to the gas outlet of the evaporator 620 via a pipeline, and the liquid outlet of which is connected to the first liquid inlet of the evaporator 620 via a pipeline.

[0084] The separation and recovery unit 600 also includes a circulation pipeline 640, one end of which is connected to the gas outlet of the supergravity distillation bed 630, and the other end of which is connected to the reflux port of the supergravity distillation bed 630.

[0085] A first condenser 641 and an acid value meter 642 are installed on the circulation pipeline 640. The acid value meter 642 is located downstream of the first condenser 641 along the flow direction of the fluid in the circulation pipeline 640.

[0086] A return pump 644 is also installed on the circulation pipeline 640 to provide the power for fluid flow.

[0087] The separation and recovery unit 600 also includes a membrane module 650, for example, a pervaporation membrane. The membrane module 650 is connected to the gas outlet of the supergravity distillation bed 630 via a first pipeline 660, on which a fourth control valve 661 is provided. The membrane module 650 is configured to dehydrate the flowing solvent to obtain the finished organic solvent.

[0088] The separation and recovery unit 600 also includes a feed pipe assembly 610, which is configured to deliver the recovered solvent to the evaporator 620 or the high gravity distillation bed 630.

[0089] Specifically, after the waste liquid separation and dehydration system is started, the waste liquid discharged from the gas-liquid separator in the waste gas adsorption treatment unit enters the evaporator 620 through the feed pipe group 610. When the liquid level in the evaporator 620 reaches the set value, the feed pipe group 610 stops feeding the waste liquid into the evaporator 620.

[0090] Evaporator 620 evaporates and vaporizes the recycled waste liquid inside it;

[0091] The gas inside the evaporator 620 flows out from the gas outlet of the evaporator 620 and flows into the supergravity distillation bed 630 through the gas inlet of the supergravity distillation bed 630. The gas enters the bottom of the supergravity distillation bed 630 and is separated by the supergravity distillation bed 630 to obtain light component gas and heavy component liquid.

[0092] The light component gas flows out from the gas outlet of the supergravity distillation bed 630 and enters the circulation pipeline 640. After being condensed by the first condenser 641, the gas is circulated back into the supergravity distillation bed 630.

[0093] The heavy component liquid flows out from the liquid outlet of the supergravity distillation bed 630 and enters the evaporator 620.

[0094] The acid value meter 642 monitors the acid value of the solvent exiting the first condenser 641 in real time. When the solvent acid value does not reach the set value, the control system repeats the above steps and the system performs full reflux operation.

[0095] The acid value meter 642 monitors the acid value of the solvent exiting the first condenser 641 in real time. When the solvent acid value reaches the set value and the value is stable, the fourth control valve 661 opens, and the light component gas with qualified acid value enters the membrane module 650 for dehydration, thereby obtaining the finished organic solvent.

[0096] When the solvent acid value reaches the set value and the value is stable, the system adjusts the opening of the fourth control valve 661 and the reflux pump 644 in conjunction with the feedback data of the acid value meter 642, thereby dynamically adjusting the reflux ratio of the system operation, improving the equipment's processing capacity and stability, and precisely adjusting parameters according to the characteristics of different recovered solvents.

[0097] A balancing pump 622 is installed on the pipeline between the liquid outlet of the high gravity distillation bed 630 and the first liquid inlet of the evaporator 620. During the separation and distillation process, the operating power of the balancing pump 622 is controlled by the current of the high gravity distillation bed 630. The operating power of the balancing pump 622 is automatically adjusted according to the power supply load of the high gravity distillation bed 630 to ensure the normal operation of the high gravity distillation bed 630. In some embodiments, the solvent acid value of the separated and purified product is <300ppm, and the water content is <0.5%.

[0098] In some embodiments of this application, the steam flowing out of the combustion chamber 910 flows through a pipeline to the supergravity distillation bed 630 to provide heat to the supergravity distillation bed 630 and realize the recovery and utilization of heat.

[0099] In some embodiments of this application, the feed pipe assembly 610 includes a first feed pipe 611, which is connected to the second liquid inlet of the evaporator 620, and a first control valve 613 is provided on the first feed pipe 611.

[0100] The feed pipe assembly 610 includes a second feed pipe 612, which is connected to the liquid inlet of the supergravity distillation bed 630. A second control valve 614 is provided on the second feed pipe 612.

[0101] The control system controls the opening or closing of the first control valve 613 and the second control valve 614 based on the acid value of the organic solvent.

[0102] Specifically, the first feed pipe 611 delivers the recovered waste liquid to the evaporator 620, and the second feed pipe 612 delivers the recovered waste liquid to the supergravity distillation bed 630.

[0103] When the system is initially running, if the acid value meter 642 detects that the initial acid value of the recovered waste liquid is in the first range, such as 4%-10%, the acid value is relatively high. The first control valve 613 is opened and the second control valve 614 is closed. The recovered waste liquid enters the evaporator 620 through the first feed pipe 611. After being evaporated and vaporized in the evaporator 620, it enters the bottom of the supergravity distillation bed 630 in a gas phase state for distillation separation.

[0104] If the acid value meter 642 detects that the initial acid value of the recovered waste liquid is within the second range, such as 1%-4%, the acid value is not very high. The first control valve 613 is closed and the second control valve 614 is opened. The recovered waste liquid does not pass through the evaporator 620, but directly enters the supergravity distillation bed 630 for distillation separation through the second feed pipe 612.

[0105] In this way, automatically adjusting the feed position based on the acid value of the recycled waste liquid helps to reduce energy consumption and improve efficiency.

[0106] In some embodiments of this application, the second feed pipe 612 includes a second feed pipe 612Ⅰ, a second control valve 614Ⅰ is provided on the second feed pipe 612Ⅰ, and the second feed pipe 612Ⅰ is connected to the lower part of the supergravity distillation bed 630.

[0107] The second feed pipe 612 includes a second feed pipe 612Ⅱ, and a second control valve 614Ⅱ is provided on the second feed pipe 612Ⅱ. The second feed pipe 612Ⅱ is connected to the middle part of the supergravity distillation bed 630.

[0108] The control system controls the opening or closing of the second control valve 614Ⅰ and the second control valve 614Ⅱ based on the feedback data from the acid value meter.

[0109] Specifically, if the acid value meter 642 detects that the initial acid value of the recovered waste liquid is within the third range, such as 1%-2%, then the first control valve 613 is closed, the second control valve 614Ⅰ is closed, and the second control valve 614Ⅱ is opened. The recovered waste liquid enters the middle of the supergravity distillation bed 630 in liquid phase through the second feed pipe 612Ⅱ for distillation separation.

[0110] If the acid value meter 642 detects that the initial acid value of the recovered waste liquid is within the fourth range, for example, 2%-4%, then the first control valve 613 is closed, the second control valve 614Ⅱ is closed, and the second control valve 614Ⅰ is opened. The recovered waste liquid enters the bottom of the supergravity distillation bed 630 in liquid phase through the second feed pipe 612Ⅰ for distillation separation.

[0111] In this way, automatically adjusting the feed position based on the acid value of the recycled waste liquid helps to reduce energy consumption and improve efficiency.

[0112] In some embodiments of this application, a reflux tank 643 is also provided on the circulation pipeline 640. Along the flow direction of the fluid in the circulation pipeline 640, the first condenser 641, the acid value meter 642, the reflux tank 643, and the reflux pump 644 are arranged in sequence.

[0113] In some embodiments of this application, a superheater 662 is provided on a first pipeline 660 between the membrane module and the gas outlet of the supergravity distillation bed 630. The superheater 662 is located downstream of the fourth control valve 661 along the flow direction of the fluid within the first pipeline 660.

[0114] Light component gas with qualified acid value flowing out of the supergravity distillation bed 630 first flows into the superheater 662 for heating and pressurization, and then flows into the membrane module 650 for dehydration treatment.

[0115] In some embodiments of this application, the steam flowing out of the combustion chamber 910 flows through a pipeline to the superheater 662, providing heat to the superheater 622 and realizing heat recovery and utilization.

[0116] In some embodiments of this application, the liquid-gas outlet of the membrane module 650 is connected to a second pipeline 670, on which a second condenser 671, a regeneration solvent tank 672, and a product pump 674 are sequentially arranged. A moisture meter 673 is also arranged on the second pipeline 670.

[0117] The liquid gas flowing out of the membrane module is condensed by the second condenser 671 and then enters the regeneration solvent tank 672. The moisture meter 673 detects the water content of the regeneration solvent online in real time. When the set value is reached, the product pump 674 is turned on to discharge the regeneration solvent of the finished product.

[0118] In some embodiments of this application, the aqueous gas outlet of the membrane module 650 is connected to a third pipeline 680, and a third condenser 681, a vacuum buffer tank 682, and a wastewater pump 684 are sequentially arranged on the third pipeline 680. The vacuum buffer tube is connected to a vacuum pump 683.

[0119] The aqueous phase gas flowing out of the membrane module 650 is condensed by the third condenser 681 and then enters the vacuum buffer tank 682. When the liquid level in the vacuum buffer tank 682 reaches the set value, the wastewater pump 684 is turned on to discharge the wastewater.

[0120] In some embodiments of this application, the waste liquid outlet of the evaporator 620 is connected to a waste liquid pump 621 via a pipeline. When the liquid level of the waste liquid in the evaporator 620 reaches a set value, the waste liquid pump 621 is turned on to discharge the waste liquid.

[0121] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0122] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A waste liquid recycling system, characterized in that, Including: The waste gas adsorption treatment unit is configured to adsorb organic waste gas; A separation and recovery unit is configured to separate and recover the recovered solvent generated by the waste gas adsorption treatment unit. The waste liquid treatment unit includes: The wastewater generated by the exhaust gas adsorption treatment unit and the waste liquid generated by the separation and recovery unit are sprayed into the combustion chamber through atomizing nozzles and burned. A water supply unit is configured to supply combustion water to the combustion chamber, wherein the heat generated in the combustion chamber heats the combustion water and produces saturated steam; The saturated steam flows through pipelines to the heating modules in the waste gas adsorption treatment unit and the separation and recovery unit.

2. The waste liquid recycling system according to claim 1, characterized in that, The water supply unit includes an inlet pipe and a heat exchanger. The inlet pipe is connected to the combustion chamber, and the combustion chamber is connected to an exhaust pipe. The inlet pipe and the exhaust pipe exchange heat through the heat exchanger.

3. The waste liquid recycling system according to claim 2, characterized in that, An oxygen content monitor is installed on the exhaust pipe.

4. The waste liquid recycling system according to claim 1, characterized in that, The combustion chamber is connected to an air supply pipeline and a natural gas supply pipeline, and the air supply volume of the air supply pipeline and the natural gas supply volume of the natural gas supply pipeline are adjustable.

5. The waste liquid recycling system according to claim 1, characterized in that, The combustion chamber includes a steam-water separator and is connected to a steam discharge pipeline. The saturated steam generated in the combustion chamber is separated by the steam-water separator before entering the steam discharge pipeline.

6. The waste liquid recycling system according to claim 1, characterized in that, The wastewater generated by the exhaust gas adsorption treatment unit and the waste liquid generated by the separation and recovery unit are premixed by a mixer and then sprayed into the combustion chamber through an atomizing nozzle.

7. The waste liquid recycling system according to any one of claims 1 to 6, characterized in that, The waste gas adsorption treatment unit includes: A rotating wheel, wherein multiple channel units for gas flow are provided on the rotating wheel, and the multiple channel units are distributed around the axis of the rotating wheel; An exhaust gas pipeline is connected to at least one of the channel units, and the exhaust gas pipeline is configured to allow exhaust gas to flow through the corresponding channel unit for adsorption treatment. A desorption circulation unit is connected to at least one of the channel units, and the desorption circulation unit is configured such that inert gas flows through the corresponding channel unit for desorption processing; The desorption circulation unit is provided with a condenser, a gas-liquid separator and a heater in sequence along the gas flow direction. The gas outlet of the gas-liquid separator is connected to the heater through a pipeline, and the liquid outlet of the gas-liquid separator is connected to the separation and recovery unit through a pipeline. The steam flowing out of the combustion chamber flows to the heater through a pipeline.

8. The waste liquid recycling system according to any one of claims 1 to 6, characterized in that, The separation and recycling unit includes: An evaporator is configured to evaporate and vaporize the flowing organic solvent; A supergravity distillation bed, wherein the gas inlet of the supergravity distillation bed is connected to the gas outlet of the evaporator via a pipeline, and the liquid outlet of the supergravity distillation bed is connected to the first liquid inlet of the evaporator via a pipeline; The circulation pipeline is connected at one end to the gas outlet of the supergravity distillation bed and at the other end to the reflux port of the supergravity distillation bed. A first condenser is installed on the circulation pipeline. A membrane module is connected to the gas outlet of the supergravity distillation bed via a first pipeline. The membrane module is configured to dehydrate the flowing solvent to obtain the finished organic solvent. The steam flowing out of the combustion chamber flows through a pipeline to the supergravity distillation bed.

9. The waste liquid recycling system according to claim 8, characterized in that, A superheater is installed on the first pipeline, and the steam flowing out of the combustion chamber flows to the superheater through the pipeline.

10. The waste liquid recycling system according to claim 8, characterized in that, An acid value meter is installed on the circulation pipeline, and the separation and recovery unit also includes a feed pipe assembly, which is configured to deliver the recovered waste liquid to the evaporator or the high gravity distillation bed according to the acid value of the organic solvent.

Images