Stripping liquid recovery system and stripping liquid recovery method

Abstract

The invention relates to a stripping liquid recovery system and a stripping liquid recovery method, and belongs to the technical field of waste recovery. The atomized waste gas with impurities adsorbed is separated through the gas-liquid separation assembly to form a liquid stripping solution and a vapor stripping solution with higher purity, and the vapor stripping solution is cooled through the cooling assembly to form a semi-finished product stripping solution; the liquid stripping liquid is conveyed to the evaporation unit to evaporate water so as to form vapor stripping liquid again, and the vapor stripping liquid is conveyed to the adsorption unit to be subjected to adsorption treatment, so that the stripping liquid in the waste gas is recycled, the concentration of the recycled semi-finished stripping liquid is improved by utilizing the gas-liquid separation assembly, the pollution to the environment is reduced, and meanwhile, the production cost is reduced. The spraying water mist amount is controlled and calculated through the control unit according to the temperature, the flow speed and the impurity content of the waste gas so that the spraying water mist amount can be adjusted in real time, and the recovery efficiency of the stripping liquid is improved.

Description

Technical Field

[0001] The invention relates to a stripping liquid recovery system and a stripping liquid recovery method, belonging to the technical field of waste material recovery. Background Art

[0002] Stripping fluid is an important chemical raw material, widely used in oil processing, fine chemicals, pharmaceuticals, pesticides, electronic products and other fields. It plays a pivotal role in the chemical industry and is widely used in photoresist stripping fluid and LCD liquid crystal material production. The used stripping fluid will be discharged into the atmosphere in the form of organic waste gas (about 120℃), which not only causes great pollution to the local environment, but also causes huge economic losses and energy waste. The conventional treatment process is generally to directly discharge after being absorbed by the waste gas tower to meet environmental protection standards. Although it reduces the pollution to the environment, it also causes the waste of expensive stripping fluid. Summary of the invention

[0003] The object of the present invention is to provide a stripping liquid recovery system and a stripping liquid recovery method to solve the above-mentioned problems.

[0004] To achieve the above object, the present invention provides the following technical solution: a stripping liquid recovery system, the stripping liquid recovery system comprising:

[0005] The evaporation adsorption component comprises an evaporation unit and an adsorption unit which are interconnected. The exhaust gas enters the evaporation unit and adsorbs impurities at the adsorption unit through water mist spraying to form atomized exhaust gas. The adsorption unit is provided with a temperature sensor, an exhaust gas flow rate sensor and a gas quality sensor for detecting the temperature, flow rate and impurity content of the exhaust gas.

[0006] A gas-liquid separation component connected to the adsorption unit, the gas-liquid separation component is used to separate the atomized waste gas after the impurities are adsorbed into a vapor stripping liquid and a liquid stripping liquid;

[0007] A filter assembly is connected between the gas-liquid separation assembly and the evaporation unit, and is used to filter the liquid stripping liquid separated by the gas-liquid separation assembly and transport it to the evaporation unit to evaporate the water. The evaporation unit vaporizes the residual stripping liquid in the liquid stripping liquid again to form a vapor stripping liquid and transports it to the adsorption unit;

[0008] A cooling component connected to the gas-liquid separation component and condensing the vaporous stripping liquid separated at the gas-liquid separation component to form a semi-finished stripping liquid;

[0009] A concentration detection component connected to the cooling component to receive the semi-finished product stripping liquid and detect the concentration of the semi-finished product stripping liquid;

[0010] A control unit is connected to the adsorption unit signal, and the control unit controls and calculates the spray water mist amount according to the temperature, flow rate and impurity content of the exhaust gas to adjust the spray water mist amount in real time.

[0011] Furthermore, the calculation formula for the spray water volume is: Qs=K1\cdot F+K2\cdot Cm+K3\cdot T, wherein Qs is the amount of spray water mist, F is the exhaust gas flow rate, Cm is the impurity content, T is the exhaust gas temperature, K1 is the influence coefficient of the exhaust gas flow rate on the spray water mist volume, K2 is the influence coefficient of the impurity content on the spray water mist volume, and K3 is the influence coefficient of the temperature on the spray water mist volume.

[0012] Furthermore, a heat exchanger is provided between the evaporation unit and the adsorption unit, and the heat exchanger is used to recover the heat emitted by the exhaust gas or the vapor-state stripping liquid to the evaporation unit.

[0013] Furthermore, the concentration detection component includes a storage tank connected to the cooling component for storing the semi-finished product stripping liquid and a concentration detection structure connected to the storage tank for detecting the concentration of the semi-finished product stripping liquid.

[0014] Furthermore, the concentration detection structure includes a circulation pipeline connected to the storage tank, a circulation pump arranged on the circulation pipeline, and a concentration detection member arranged on the circulation pipeline.

[0015] Furthermore, the stripping liquid recovery system also includes a concentration adjustment component connected to the storage tank, the concentration adjustment component includes a weighing piece arranged on the storage tank for weighing the semi-finished stripping liquid, a single product adding structure connected to the storage tank, and a controller electrically connected to the weighing piece and the single product adding structure, the controller calculates the single product addition amount according to the detection result of the weighing piece and controls the single product adding structure to add the single product.

[0016] Furthermore, the single product adding structure includes a single product adding tank for storing single products, a single product adding pipeline connected between the single product adding tank and the storage tank, a power pump arranged on the single product adding pipeline, and a weighing device arranged on the single product adding tank.

[0017] Furthermore, the weighing device includes a frame and an electronic scale arranged on the frame, and a hanging ear is arranged on the storage tank, and the hanging ear is overlapped on the electronic scale.

[0018] The present invention also provides a stripping liquid recovery method, which is applicable to the stripping liquid recovery system as described above, and the stripping liquid recovery method comprises:

[0019] The exhaust gas is transported to an adsorption unit for adsorption treatment, wherein the adsorption unit adsorbs impurities in the exhaust gas and cools the exhaust gas to 40-80°C;

[0020] The waste gas treated by adsorption is separated into vapor stripping liquid and liquid stripping liquid by a gas-liquid separation component, the vapor stripping liquid is transported to a cooling component, and the liquid stripping liquid is transported to an evaporation unit to evaporate water and evaporate again to form vapor stripping liquid;

[0021] The cooling component cools the vapor stripping liquid to 20-40° C. to form a semi-finished stripping liquid and transports it to the concentration detection component for concentration detection.

[0022] Furthermore, the step of transporting the waste gas to the adsorption unit for adsorption treatment includes:

[0023] The adsorption unit sprays deionized water in an atomized state onto the exhaust gas to adsorb impurities from the exhaust gas and reduce the temperature of the exhaust gas.

[0024] The beneficial effects of the present invention are as follows: the present application arranges an evaporation adsorption component to adsorb impurities from the stripping liquid waste gas and form an atomized waste gas, and then separates the atomized waste gas after adsorbing impurities through a gas-liquid separation component to form a liquid stripping liquid and a vapor stripping liquid with a higher purity. The vapor stripping liquid is then cooled by a cooling component to form a semi-finished stripping liquid, and the liquid stripping liquid is transported to the evaporation unit to evaporate water to form a vapor stripping liquid again and transported to the adsorption unit for adsorption treatment, thereby realizing the recovery of the stripping liquid in the waste gas, and utilizing the gas-liquid separation component to increase the concentration of the recovered semi-finished stripping liquid, thereby reducing pollution to the environment. At the same time, the control unit controls and calculates the spray water mist amount according to the temperature, flow rate and impurity content of the waste gas to adjust the spray water mist amount in real time, thereby improving the recovery efficiency of the stripping liquid.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a stripping liquid recovery system shown in an embodiment of the present application;

[0027] Figure 2 Flow chart of a stripping liquid recovery method shown in one embodiment of the present application. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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.

[0031] Please refer to Figure 1 to Figure 2 A stripping liquid recovery system is shown in one embodiment of the present application. The stripping liquid recovery system includes an evaporation adsorption component 10, a gas-liquid separation component 20, a filtering component 50, a cooling component 30 and a concentration detection component. The stripping liquid recovery system is used for recycling organic waste gas generated after the use of stripping liquid in the production of LCD liquid crystal materials. The present application mainly recovers Stripper stripping liquid.

[0032] The evaporative adsorption component 10 includes an evaporation unit 11 and an adsorption unit 12 which are interconnected. The waste gas enters from the evaporative unit 11 and adsorbs impurities at the adsorption unit 12 through water mist spraying to form atomized waste gas. The adsorption unit 11 is provided with a temperature sensor, a waste gas flow rate sensor and a gas quality sensor for detecting the temperature, flow rate and impurity content of the waste gas. The evaporative adsorption component 10 is provided with a waste gas inlet port 111 and a liquid inlet port to receive the waste gas and the liquid stripping liquid respectively. Among them, the evaporative adsorption component 10 is a distillation tower, which is a prior art and will not be described in detail here.

[0033] The gas-liquid separation component 20 is connected to the adsorption unit 12, and is used to separate the atomized waste gas after the impurities are adsorbed to form a vapor stripping liquid and a liquid stripping liquid. It should be noted that the liquid stripping liquid here refers to a mixed liquid of water formed after the atomized waste gas is separated, a small amount of residual stripping liquid, and a small amount of impurities that are not completely adsorbed by the adsorption unit 12.

[0034] The filter assembly 50 is connected between the gas-liquid separation assembly 20 and the evaporation unit 11, and is used to filter the liquid stripping liquid separated by the gas-liquid separation assembly 20 and transport it to the evaporation unit 11 to evaporate the water. The evaporation unit 11 vaporizes the residual stripping liquid in the liquid stripping liquid again to form a vapor stripping liquid and transports it to the adsorption unit 12. The filter assembly 50 is a filter, which is used to filter the impurities that may exist in the liquid stripping liquid, thereby reducing the impurity content in the semi-finished stripping liquid formed in the end. It is a prior art and will not be described here.

[0035] Elaboration

[0036] The cooling component 30 is connected to the gas-liquid separation component 20 and condenses the vaporous stripping liquid separated by the gas-liquid separation component 20 to form a semi-finished stripping liquid. The cooling component 30 is a cooler for converting the vaporous stripping liquid into a semi-finished stripping liquid.

[0037] The concentration detection component is connected to the cooling component 30 to receive the semi-finished product stripping liquid and detect the concentration of the semi-finished product stripping liquid.

[0038] The control unit is connected to the adsorption unit 11 by signal. The control unit controls and calculates the spraying water mist amount according to the temperature, flow rate and impurity content of the exhaust gas to adjust the spraying water mist amount in real time.

[0039] The calculation formula for the spray water volume is: Qs = K1\cdot F + K2\cdot Cm + K3\cdotT, where Qs is the amount of spray water mist, in L / h, and F is the exhaust gas flow rate, in m 3 / h, Cm is the impurity content, the unit is mg / m 3 , T is the exhaust gas temperature, in units of °C, K1 is the influence coefficient of the exhaust gas flow rate on the spray water mist volume, K2 is the influence coefficient of the impurity content on the spray water mist volume, and K3 is the influence coefficient of the temperature on the spray water mist volume. Among them, the influence coefficients K1, K2 and K3 can be obtained based on the experimental data analysis of the actual exhaust gas. In one embodiment, the experimental data analysis shows that K1 is 0.5, K2 is 0.8, and K3 is -0.3. The calculation formula for the spray water volume is Qs=0.5\cdot F+0.8\cdot Cm-0.4\cdotT. This formula is convenient for adjusting the amount of spray water mist according to the exhaust gas flow rate, impurity content and temperature to maintain the best state of the impurity adsorption effect, so that the pure recovery rate of the stripping liquid reaches more than 95%.

[0040] In one embodiment, a heat exchanger is provided between the evaporation unit 11 and the adsorption unit 12, and the heat exchanger is used to recover the heat emitted by the exhaust gas or the vapor-state stripping liquid to the evaporation unit 11. The heat is recovered and reused by the heat exchanger, which is convenient for reducing the energy consumption of the stripping liquid recovery system, thereby reducing the recovery cost, wherein the heat exchanger is a prior art and is not described in detail here.

[0041] In one embodiment, an exhaust port is provided at the evaporation unit 11, and the exhaust port is used to discharge evaporated water. A valve is provided on the exhaust port, which is convenient to open when the liquid stripping liquid evaporates water to discharge the water in time, and close when only waste gas enters to avoid waste gas leakage.

[0042] In one embodiment, the concentration detection component includes a storage tank connected to the cooling component 30 for storing the semi-finished product stripping liquid and a concentration detection structure 40 connected to the storage tank for detecting the concentration of the semi-finished product stripping liquid. The storage tank is used to collect and store the semi-finished product stripping liquid for subsequent use, and the concentration of the semi-finished product stripping liquid is detected by the concentration detection structure 40 for subsequent use or concentration adjustment.

[0043] In one embodiment, the concentration detection structure 60 includes a circulation pipeline connected to the storage tank, a circulation pump disposed on the circulation pipeline, and a concentration detection member disposed on the circulation pipeline. The circulation pump controls the semi-finished product stripping liquid to circulate in the circulation pipeline, so as to facilitate the concentration detection of the semi-finished product stripping liquid, and at the same time, the semi-finished product stripping liquid and the single product can be fully integrated during the subsequent concentration adjustment.

[0044] In one embodiment, the stripping liquid recovery system also includes a concentration adjustment component (not shown) connected to the storage tank, the concentration adjustment component includes a weighing piece arranged on the storage tank for weighing the semi-finished stripping liquid, a single product adding structure connected to the storage tank, and a controller electrically connected to the weighing piece and the single product adding structure, the controller calculates the single product addition amount according to the detection result of the weighing piece and controls the single product adding structure to add the single product.

[0045] In one embodiment, the single product adding structure includes a single product adding tank for storing single products, a single product adding pipeline connected between the single product adding tank and the storage tank, a power pump arranged on the single product adding pipeline, and a weighing device arranged on the single product adding tank. Among them, the weighing device weighs the single product adding tank in real time to ensure that the amount of single product added meets the actual demand. The type of single product stored in the single product adding tank can be adjusted according to the application scenario of the stripping liquid, the target substance and the separation requirements, which are not specifically limited here.

[0046] In one embodiment, the weighing device includes a frame and an electronic scale disposed on the frame, and a hanging ear is disposed on the storage tank, and the hanging ear is overlapped on the electronic scale. The electronic scale records the weight change of the storage tank in real time and feeds back to the controller in time, so that when a single product needs to be added, the controller can calculate the amount of the single product to be added according to the weight of the storage tank 40 in time, thereby realizing the adjustment of the semi-finished stripping liquid into the finished stripping liquid at any time.

[0047] Please refer to Figure 2 The present invention also provides a stripping liquid recovery method, which is applicable to the stripping liquid recovery system as described above, and the stripping liquid recovery method comprises:

[0048] S1: The exhaust gas is transported to the adsorption unit 12 for adsorption treatment. The adsorption unit 12 adsorbs impurities in the exhaust gas and cools the exhaust gas to 40-80°C;

[0049] S2: The waste gas treated by adsorption is separated into vaporous stripping liquid and liquid stripping liquid by the gas-liquid separation component 20. The vaporous stripping liquid is transported to the cooling component 30, and the liquid stripping liquid is transported to the evaporation unit 11 to evaporate water and evaporate again to form vaporous stripping liquid. The above steps control the evaporation of water to increase the concentration of the stripping liquid recovery waste liquid. The evaporation of water takes away the heat, and the stripping liquid is intercepted at the same time, which fully ensures that the exhaust gas meets the environmental protection standards. The stripping liquid waste gas is treated by utilizing the high water solubility of the stripping liquid. The water adsorption method can basically completely absorb the stripping liquid in the waste gas, so that the pure recovery rate of the stripping liquid reaches more than 95%.

[0050] S3: The cooling component 30 cools the vapor stripping liquid to 20-40° C. to form a semi-finished stripping liquid and transports it to the concentration detection component for concentration detection.

[0051] In one embodiment, conveying the exhaust gas to the adsorption unit 12 for adsorption treatment includes:

[0052] S11: The adsorption unit 12 sprays deionized water in an atomized state on the waste gas to adsorb impurities and cool the waste gas. Based on the principle that deionized water and stripping liquid are mutually soluble and have different partial pressures, during condensation, since the stripping liquid has a much higher boiling point than deionized water and is easier to condense than deionized water, the concentration of the stripping liquid in the condensate is much higher than that in the gas phase, and the concentration of the recovered liquid is high, reaching 20% ​​to 50%. Compared with the ordinary condensation method, this method can be operated at room temperature, and the condensation temperature can be lower than 40°C, without the need for ultra-low temperature.

[0053] The present application arranges an evaporation adsorption component to adsorb impurities from the stripping liquid waste gas and form an atomized waste gas, and then separates the atomized waste gas after the impurities are adsorbed into a liquid stripping liquid and a vapor stripping liquid with a higher purity through a gas-liquid separation component. The vapor stripping liquid is then cooled by a cooling component to form a semi-finished stripping liquid, and the liquid stripping liquid is transported to an evaporation unit to evaporate water to form a vapor stripping liquid again and transported to an adsorption unit for adsorption treatment, thereby realizing the recovery of the stripping liquid in the waste gas, and utilizing the gas-liquid separation component to increase the concentration of the recovered semi-finished stripping liquid, thereby reducing pollution to the environment. At the same time, the control unit controls and calculates the spray water mist amount according to the temperature, flow rate and impurity content of the waste gas to adjust the spray water mist amount in real time, thereby improving the recovery efficiency of the stripping liquid.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A stripping liquid recovery system, characterized in that: The stripping liquid recovery system comprises: The evaporation adsorption component comprises an evaporation unit and an adsorption unit which are interconnected. The exhaust gas enters the evaporation unit and adsorbs impurities at the adsorption unit through water mist spraying to form atomized exhaust gas. The adsorption unit is provided with a temperature sensor, an exhaust gas flow rate sensor and a gas quality sensor for detecting the temperature, flow rate and impurity content of the exhaust gas. A gas-liquid separation component connected to the adsorption unit, the gas-liquid separation component is used to separate the atomized waste gas after the impurities are adsorbed into a vapor stripping liquid and a liquid stripping liquid; A filter assembly is connected between the gas-liquid separation assembly and the evaporation unit, and is used to filter the liquid stripping liquid separated by the gas-liquid separation assembly and transport it to the evaporation unit to evaporate the water. The evaporation unit vaporizes the residual stripping liquid in the liquid stripping liquid again to form a vapor stripping liquid and transports it to the adsorption unit; A cooling component connected to the gas-liquid separation component and condensing the vaporous stripping liquid separated at the gas-liquid separation component to form a semi-finished stripping liquid; A concentration detection component connected to the cooling component to receive the semi-finished product stripping liquid and detect the concentration of the semi-finished product stripping liquid; A control unit is connected to the adsorption unit signal, and the control unit controls and calculates the spray water mist amount according to the temperature, flow rate and impurity content of the exhaust gas to adjust the spray water mist amount in real time.

2. The stripping liquid recovery system according to claim 1, characterized in that: The calculation formula for the spray water volume is: Qs=K1\cdot F+K2\cdot Cm+K3\cdot T, wherein Qs is the amount of spray water mist, F is the exhaust gas flow rate, Cm is the impurity content, T is the exhaust gas temperature, K1 is the influence coefficient of the exhaust gas flow rate on the spray water mist volume, K2 is the influence coefficient of the impurity content on the spray water mist volume, and K3 is the influence coefficient of the temperature on the spray water mist volume.

3. The stripping liquid recovery system according to claim 1, characterized in that: A heat exchanger is provided between the evaporation unit and the adsorption unit, and the heat exchanger is used to recover the heat emitted by the exhaust gas or the vapor-state stripping liquid to the evaporation unit.

4. The stripping liquid recovery system according to claim 1, characterized in that: The concentration detection component includes a storage tank connected to the cooling component for storing the semi-finished product stripping liquid and a concentration detection structure connected to the storage tank for detecting the concentration of the semi-finished product stripping liquid.

5. The stripping liquid recovery system according to claim 4, characterized in that: The concentration detection structure comprises a circulation pipeline connected to the storage tank, a circulation pump arranged on the circulation pipeline, and a concentration detection member arranged on the circulation pipeline.

6. The stripping liquid recovery system according to claim 5, characterized in that: The stripping liquid recovery system also includes a concentration adjustment component connected to the storage tank, the concentration adjustment component includes a weighing piece arranged on the storage tank for weighing the semi-finished stripping liquid, a single product adding structure connected to the storage tank, and a controller electrically connected to the weighing piece and the single product adding structure, the controller calculates the single product addition amount according to the detection result of the weighing piece and controls the single product adding structure to add the single product.

7. The stripping liquid recovery system according to claim 6, characterized in that: The single product adding structure includes a single product adding tank for storing single products, a single product adding pipeline connected between the single product adding tank and the storage tank, a power pump arranged on the single product adding pipeline, and a weighing piece arranged on the single product adding tank.

8. The stripping liquid recovery system according to claim 6, characterized in that: The weighing piece comprises a frame and an electronic scale arranged on the frame, and a hanging ear is arranged on the storage tank, and the hanging ear is overlapped on the electronic scale.

9. A stripping liquid recovery method, applicable to the stripping liquid recovery system as claimed in any one of claims 1 to 8, characterized in that: The stripping liquid recovery method comprises: The exhaust gas is transported to an adsorption unit for adsorption treatment, wherein the adsorption unit adsorbs impurities in the exhaust gas and cools the exhaust gas to 40-80°C; The waste gas treated by adsorption is separated into vapor stripping liquid and liquid stripping liquid by a gas-liquid separation component, the vapor stripping liquid is transported to a cooling component, and the liquid stripping liquid is transported to an evaporation unit to evaporate water and evaporate again to form vapor stripping liquid; The cooling component cools the vapor stripping liquid to 20-40° C. to form a semi-finished stripping liquid and transports it to the concentration detection component for concentration detection.

10. The stripping solution recovery method according to claim 9, characterized in that: The step of transporting the waste gas to the adsorption unit for adsorption treatment comprises: The adsorption unit sprays deionized water in an atomized state onto the exhaust gas to adsorb impurities from the exhaust gas and reduce the temperature of the exhaust gas.

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