Membrane distillation-stripping combined equipment for ammonia-nitrogen wastewater

Abstract

The application relates to the field of environmental engineering technology, in particular to a membrane distillation-air stripping combined device for ammonia-nitrogen wastewater, which comprises a base, a distillation mechanism, a gas guide pipe and a liquid supply tank, the distillation mechanism is fixedly installed at the top of the base, the liquid supply tank is arranged on one side of the distillation mechanism, and the gas guide pipe is communicated with the top of the distillation mechanism; the device can heat the heat-conducting oil in the closed cavity through the heater, the heating bottom plate, the heating outer shell, the heating inner shell and other components, the heat-conducting oil further transfers heat to the ammonia-nitrogen wastewater in the heating inner shell and the heating outer shell, and the ammonia-nitrogen wastewater can be uniformly heated through the stable heat conduction structure, so that the wastewater distillation efficiency is improved. Meanwhile, the turbulence block on the inner wall of the heating outer shell and the flow guide hole of the heating inner shell are matched with each other, the wastewater turbulence is enhanced, and the heat exchange efficiency is further improved.

Description

Technical Field

[0001] This application relates to the field of environmental engineering technology, and in particular to membrane distillation-air stripping equipment for ammonia nitrogen wastewater. Background Technology

[0002] With increasingly stringent environmental protection requirements, ammonia nitrogen wastewater treatment has become a critical issue that many industries urgently need to address. Industries such as chemical, pharmaceutical, and food processing generate large amounts of ammonia nitrogen wastewater during production. Direct discharge of ammonia nitrogen depletes dissolved oxygen in water bodies, leading to oxygen deprivation and death of aquatic organisms. It may also be converted into nitrite and nitrate, threatening human health.

[0003] Currently, traditional methods for treating ammonia nitrogen wastewater, such as biological methods, chemical precipitation, and stripping, have certain limitations. Biological methods have long treatment cycles, require high water quality, and are inefficient when treating high-concentration ammonia nitrogen wastewater. While chemical precipitation can remove ammonia nitrogen, it produces a large amount of sludge, increasing subsequent treatment costs. Stripping consumes a large amount of steam, resulting in high energy consumption and potential secondary pollution. Although membrane distillation-air stripping technology has shown certain advantages in ammonia nitrogen wastewater treatment, existing equipment has shortcomings in heat exchange efficiency, impurity filtration accuracy, and operational stability, making it difficult to meet the demands for efficient and stable treatment of ammonia nitrogen wastewater under complex operating conditions.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: Existing devices do not employ a design similar to a heating base plate, heating outer shell, and heating inner shell combined with heat transfer oil, thus failing to create a uniform heating environment. This results in localized overheating or underheating of the ammonia nitrogen wastewater, affecting the distillation effect. Furthermore, the lack of staggered flow guide holes on the heating inner shell and turbulence blocks on the inner wall of the heating outer shell prevents effective expansion of the contact area with the wastewater and enhancement of turbulence, leading to low heat transfer efficiency, a slow distillation process, and increased energy consumption. Utility Model Content

[0005] To address the problems mentioned in the background section, this application provides a membrane distillation-air stripping combined device for ammonia nitrogen wastewater.

[0006] The membrane distillation-gas stripping combined equipment for ammonia nitrogen wastewater provided in this application adopts the following technical solution: A membrane distillation-gas stripping combined equipment for ammonia nitrogen wastewater includes a base, a distillation mechanism, a gas delivery pipe, and a liquid supply tank. The distillation mechanism is fixedly installed on the top of the base, and a liquid supply tank is provided on one side of the distillation mechanism. The top of the distillation mechanism is connected to the gas delivery pipe. The distillation mechanism includes a heater, a heating base plate, a heating outer shell, a heating inner shell, and a distillation membrane. The heater is fixedly installed at the bottom of the heating base plate. The heating base plate, the heating outer shell, and the heating inner shell together form a sealed cavity, which is filled with heat-conducting oil. The heating base plate supports the heater and, together with the heating outer shell and the heating inner shell, forms a sealed cavity for heat conduction. Both the heating outer shell and the heating inner shell are hollow structures. The distillation membrane is disposed at the connection between the distillation mechanism and the gas delivery pipe for filtering impurities in the vapor.

[0007] Optionally, the distillation mechanism further includes a flow guide shroud and an observation window. The flow guide shroud is fixedly installed on the top of the heating shell to guide steam into the gas guide pipe. The observation window is fixedly installed on one side of the heating shell to observe the liquid level and flow state inside the heating shell.

[0008] Optionally, the inner wall of the heating shell is fixedly connected with multiple turbulence blocks. These turbulence blocks are hemispherical or trapezoidal protrusions, equidistantly arranged along the circumference of the inner wall of the heating shell. The spacing between adjacent rows of turbulence blocks is 1.5-2 times the diameter of the guide holes, enhancing the turbulence effect of the ammonia nitrogen wastewater and improving distillation efficiency. Several guide holes are perforated on one side of the heating inner shell, arranged in multiple staggered rows to expand the contact area between the heating inner shell and the ammonia nitrogen wastewater and enhance the turbulence effect.

[0009] Optionally, the supply tank consists of multiple independent tanks for storing ammonia nitrogen wastewater. Each tank is connected to a sealed cavity formed by a heating base plate, a heating outer shell, and a heating inner shell via a pipe with a built-in one-way valve, and the outlet end of each pipe extends to the bottom of the sealed cavity. The heating inner shell provides heating space for the ammonia nitrogen wastewater, and the guide holes on its side are used to increase the contact area with the ammonia nitrogen wastewater and enhance the turbulence effect.

[0010] Optionally, the observation window is made of a high-temperature resistant transparent material. The observation window has an anti-fog coating on its surface and liquid level markings on its outer edge, used to observe the liquid level and flow state inside the heating shell. Its surface has an anti-fog coating, and liquid level markings are marked on its outer edge.

[0011] Optionally, the baffle blocks are hemispherical or trapezoidal protrusions arranged equidistantly along the circumferential direction of the inner wall of the heating shell, with the spacing between two adjacent rows of baffle blocks being 1.5-2 times the diameter of the guide hole.

[0012] Optionally, the heater is an electric heating tube or an electromagnetic heating device, with its heating part evenly embedded inside the heating base plate, and the bottom of the heating base plate is provided with heat dissipation fins.

[0013] In summary, this application includes the following beneficial technical effects: 1. This utility model, by setting up components such as a heater, a heating base plate, a heating outer shell, and a heating inner shell, utilizes the cooperative relationship between the heater and the heating base plate, heating outer shell, and heating inner shell to enable the heater to heat the heat-conducting oil in the sealed cavity through the heating base plate. The heat-conducting oil then transfers heat to the ammonia nitrogen wastewater in the heating inner shell and heating outer shell. This achieves the effect of uniformly heating the ammonia nitrogen wastewater through a stable heat-conducting structure, thereby improving the wastewater distillation efficiency. Simultaneously, the turbulence blocks on the inner wall of the heating outer shell cooperate with the flow guide holes in the heating inner shell to enhance wastewater turbulence, further improving heat exchange efficiency. 2. This utility model, by incorporating components such as a distillation membrane, a flow guide, an observation window, and a liquid supply tank, utilizes the cooperative relationship between the flow guide, the distillation mechanism, and the gas delivery pipe. The flow guide guides the heated steam into the gas delivery pipe, while the distillation membrane filters impurities from the steam, ensuring its purity. The observation window allows operators to monitor the internal liquid level and flow status in real time. The independent tank body and one-way valve design of the liquid supply tank ensure a continuous and stable supply of wastewater. Thus, this device achieves continuous treatment of ammonia nitrogen wastewater through a rational gas-liquid separation and monitored liquid supply structure, improving equipment reliability and ease of operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application; Figure 2 This is a partial structural diagram of an embodiment of this application; Figure 3 This is a partial structural diagram of the distillation mechanism in an embodiment of this application; Figure 4 This is a schematic diagram of the partial structure installation of the distillation mechanism in an embodiment of this application; Reference numerals: 1. Base; 2. Distillation mechanism; 201. Heater; 202. Heating base plate; 203. Heating outer shell; 204. Heating inner shell; 205. Flow guide hole; 206. Turbulence block; 207. Observation window; 208. Flow guide hood; 209. Distillation membrane; 3. Gas guide pipe; 4. Liquid supply tank. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0016] This application discloses a membrane distillation-air stripping combined device for ammonia nitrogen wastewater.

[0017] Example Please see Figures 1-4 A membrane distillation-gas stripping combined device for ammonia nitrogen wastewater includes a base 1, a distillation mechanism 2, a gas delivery pipe 3, and a liquid supply tank 4. The distillation mechanism 2 is fixedly installed on the top of the base 1, and the liquid supply tank 4 is provided on one side of the distillation mechanism 2. The top of the distillation mechanism 2 is connected to the gas delivery pipe 3. The distillation mechanism 2 includes a heater 201, a heating base plate 202, a heating outer shell 203, a heating inner shell 204, and a distillation membrane 209. The heater 201 is fixedly installed at the bottom of the heating base plate 202 and provides a stable heat source for the device. The heating base plate 202, the heating outer shell 203, and the heating inner shell 204 together form a sealed cavity, which is filled with heat-conducting oil. The heat-conducting oil inside the sealed cavity can uniformly heat the wastewater inside. The heating outer shell 203 and the heating inner shell 204 are both hollow structures. The distillation membrane 209 is provided at the connection between the distillation mechanism 2 and the gas delivery pipe 3 and is used to filter impurities in the vapor.

[0018] Multiple turbulence blocks 206 are fixedly connected to the inner wall of the heating shell 203. The turbulence blocks 206 are hemispherical or trapezoidal protrusions, and are arranged at equal intervals along the circumference of the inner wall of the heating shell. The spacing between two adjacent rows of turbulence blocks 206 is 1.5-2 times the diameter of the guide hole 205, which enhances the turbulence effect of ammonia nitrogen wastewater and improves distillation efficiency. Several guide holes 205 are opened through one side of the heating inner shell 204. The guide holes 205 are arranged in multiple rows in an alternating pattern to expand the contact area between the heating inner shell 204 and the ammonia nitrogen wastewater and enhance the turbulence effect.

[0019] The liquid supply tank 4 consists of multiple independent tanks for storing ammonia nitrogen wastewater. Each tank is connected to a sealed cavity formed by the heating base plate 202, the heating outer shell 203, and the heating inner shell 204 through a pipe with a built-in one-way valve, and the outlet end of each pipe extends to the bottom of the sealed cavity.

[0020] The distillation mechanism 2 also includes a flow guide 208 and an observation window 207. The flow guide 208 is fixedly installed on the top of the heating shell 203 and is used to guide the steam into the interior of the gas guide pipe 3. The observation window 207 is fixedly installed on one side of the heating shell 203 and is used to observe the liquid level and flow state inside the heating shell 203.

[0021] The observation window 207 is made of high-temperature resistant transparent material, with an anti-fog coating on its surface and liquid level markings on its outer edge.

[0022] The turbulence blocks 206 are hemispherical or trapezoidal protrusions, arranged equidistantly along the inner wall of the heating shell 203. The spacing between two adjacent rows of turbulence blocks 206 is 1.5-2 times the diameter of the guide hole 205.

[0023] The heater 201 is an electric heating tube or an electromagnetic heating device, and its heating part is evenly embedded inside the heating base plate 202, and the bottom of the heating base plate 202 is provided with heat dissipation fins.

[0024] High-concentration ammonia nitrogen wastewater treatment scenario in chemical synthesis workshop In chemical synthesis reactions, ammonia nitrogen wastewater discharged from the reactors requires pretreatment before entering the plant's wastewater treatment system. The following is the equipment operation procedure: First, the supply tank 4, consisting of multiple independent tanks, is connected to the sealed cavity formed by the heating base plate 202, heating outer shell 203, and heating inner shell 204 in the distillation mechanism 2 at the top of the base 1 via a pipe with a built-in one-way valve. This ensures that the outlet ends of each pipe extend vertically to the bottom of the sealed cavity, preventing wastewater from impacting and disturbing the distillation membrane 209. The observation window 207 installed on one side of the heating outer shell 203 is then inspected to confirm that the anti-fog coating on the high-temperature resistant transparent material is intact and the liquid level scale is clearly visible, facilitating subsequent monitoring of liquid level changes. Next, the heater 201 installed at the bottom of the heating base plate 202 is started. The heating part, which is evenly embedded inside the heating base plate 202, starts to work and transfers heat through the heating base plate 202 to the heat transfer oil in the sealed cavity formed by the heating base plate 202, the heating outer shell 203 and the heating inner shell 204, so that the temperature of the heat transfer oil gradually rises to the set value, usually 60-80℃.

[0025] Next, the ammonia nitrogen wastewater enters the sealed cavity through the pipeline of the supply tank 4 and first flows outside the heating inner shell 204. Because multiple rows of staggered guide holes 205 are opened through one side of the heating inner shell 204, the wastewater makes full contact with the inner wall of the heating inner shell 204 when it enters the hollow area through the guide holes 205. Simultaneously, the hemispherical or trapezoidal protrusions 206 fixedly connected to the inner wall of the heating outer shell 203 are arranged equidistantly along the circumference, with the spacing between adjacent rows being 1.5-2 times the diameter of the guide holes 205. This effectively disrupts the laminar flow of the wastewater, enhances the turbulent flow effect, and improves heat exchange efficiency. Next, the ammonia-containing vapor generated by heating and evaporation rises to the top of the heating shell 203. Guided by the fixedly installed flow guide hood 208, it flows evenly to the junction of the distillation mechanism 2 and the gas guide pipe 3. The distillation membrane 209 installed here filters the vapor, intercepting suspended solids, colloids and other impurities in the wastewater, ensuring that pure ammonia vapor enters the subsequent stripping tower for condensation and recovery through the gas guide pipe 3. Finally, the operator monitors the liquid level inside the heating shell 203 in real time through the observation window 207, referring to the outer edge liquid level scale and the wastewater flow status. When the liquid level is found to be lower than the set lower limit, the one-way valve of the liquid supply tank 4 automatically opens to replenish wastewater; if abnormal wastewater flow is observed, such as excessive local eddies, the power of the heater 201 or the flow rate of the liquid supply pump can be adjusted to ensure stable operation of the equipment. Further explanation is needed: Distillation unit 2 is the core treatment unit of the ammonia nitrogen wastewater membrane distillation-gas stripping combined equipment. Its main function is to achieve efficient extraction and purification of ammonia components in ammonia nitrogen wastewater through heating evaporation, gas-liquid separation, and impurity filtration. Its internal structure consists of a closed heat conduction system composed of components such as heater 201, heating base plate 202, heating outer shell 203, and heating inner shell 204. The heat generated by heater 201 is evenly transferred to the wastewater through the filled heat transfer oil. The multiple rows of staggered guide holes 205 on one side of the heating inner shell 204 and the turbulence blocks 206 on the inner wall of the heating outer shell 203 work together to expand the contact area between the wastewater and the heating surface and enhance turbulence, thereby improving heat exchange efficiency and reducing the ammonia nitrogen content in the wastewater. The vapor is rapidly evaporated into steam, which is then guided by the guide hood 208 to the connection between the distillation mechanism 2 and the gas guide pipe 3. The distillation membrane 209 filters out suspended solids, colloids, and other impurities in the vapor, ensuring the purity of the discharged gas. The observation window 207 installed on one side of the heating shell 203 can monitor the internal liquid level and wastewater flow status in real time, providing a direct basis for adjusting the equipment operating parameters. The entire distillation mechanism 2 achieves efficient distillation treatment of ammonia nitrogen wastewater through the coordinated action of heat transfer oil circulation heating, turbulent enhanced evaporation, and membrane filtration purification. This lays the foundation for subsequent gas stripping recovery of ammonia resources or achieving standard discharge. Its structural design takes into account heating efficiency, separation effect, and ease of operation, making it a key core component for the equipment to achieve its functions.

[0026] The implementation principle of the membrane distillation-air stripping combined equipment for ammonia nitrogen wastewater in this application embodiment is as follows: First, wastewater introduction and uniform distribution: The supply tank 4, which consists of multiple independent tanks, transports ammonia nitrogen wastewater to the distillation mechanism 2 through a pipe with a built-in one-way valve. The distillation mechanism 2 is a closed cavity formed by a heating base plate 202, a heating outer shell 203, and a heating inner shell 204. The outlet end of the pipe extends to the bottom of the cavity to ensure that the wastewater is injected smoothly and evenly distributed on the outside of the heating inner shell 204. Secondly, the heat transfer oil circulation heating and turbulence enhancement: the electric heating tube or electromagnetic heating device of the heater 201 installed at the bottom of the heating base plate 202 transfers heat to the heat transfer oil in the sealed cavity. The hollow structure of the heating outer shell 203 and the heating inner shell 204 forms a heat transfer channel. The multiple rows of staggered guide holes 205 on one side of the heating inner shell 204 allow wastewater to enter the inner side of the inner shell. At the same time, the hemispherical / trapezoidal turbulence blocks 206 on the inner wall of the heating outer shell 203 disrupt laminar flow, enhance wastewater turbulence, expand the contact area, and accelerate the heating and evaporation of ammonia nitrogen wastewater. Next, the vapor is guided and initially separated: the ammonia vapor generated by evaporation rises to the top of the heating shell 203, and is guided by the fixedly installed guide hood 208, and is evenly gathered at the junction of the distillation mechanism 2 and the gas guide pipe 3, so as to achieve initial separation of gas and liquid and prevent liquid from splashing into the gas guide pipe 3. Next, the gas is purified by membrane filtration: the distillation membrane 209 at the junction performs fine filtration of the vapor. Its microporous structure allows only water vapor and ammonia to pass through, while trapping impurities such as suspended solids and colloids, ensuring the purity of the exported gas. The filtered gas enters the subsequent gas stripping or condensation device through the gas guide pipe 3 to complete the separation and extraction of ammonia nitrogen components. Finally, operation monitoring and parameter adjustment: The operator monitors the internal liquid level and wastewater flow status in real time through the observation window 207 on one side of the heating shell 203, and adjusts the liquid supply speed of the liquid supply tank 4 or the power of the heater 201 according to the scale line and flow conditions to ensure stable and efficient operation of the equipment.

[0027] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A membrane distillation-air stripping combined device for ammonia nitrogen wastewater, comprising a base (1), a distillation mechanism (2), an air delivery pipe (3), and a liquid supply tank (4), characterized in that: The distillation mechanism (2) is fixedly installed on the top of the base (1). A liquid supply tank (4) is provided on one side of the distillation mechanism (2). A gas guide pipe (3) is connected to the top of the distillation mechanism (2). The distillation mechanism (2) includes a heater (201), a heating base plate (202), a heating outer shell (203), a heating inner shell (204), and a distillation membrane (209). The heater (201) is fixedly installed at the bottom of the heating base plate (202). The heating base plate (202), the heating outer shell (203), and the heating inner shell (204) together form a closed cavity, and the closed cavity is filled with heat transfer oil. The heating outer shell (203) and the heating inner shell (204) are both hollow structures. The distillation membrane (209) is set at the junction of the distillation mechanism (2) and the gas guide pipe (3) for filtering impurities in the vapor.

2. The membrane distillation-air stripping combined equipment for ammonia nitrogen wastewater according to claim 1, characterized in that: The distillation mechanism (2) also includes a flow guide (208) and an observation window (207). The flow guide (208) is fixedly installed on the top of the heating shell (203) to guide steam into the interior of the gas guide pipe (3). The observation window (207) is fixedly installed on one side of the heating shell (203) to observe the liquid level and flow state inside the heating shell (203).

3. The membrane distillation-air stripping combined equipment for ammonia nitrogen wastewater according to claim 1, characterized in that: The inner wall of the heating shell (203) is fixedly connected with a plurality of turbulence blocks (206), and a plurality of flow guide holes (205) are provided through one side of the heating inner shell (204). The flow guide holes (205) are arranged in multiple rows in an alternating manner to expand the contact area between the heating inner shell (204) and the ammonia nitrogen wastewater and enhance the turbulence effect.

4. The membrane distillation-air stripping combined equipment for ammonia nitrogen wastewater according to claim 1, characterized in that: The supply tank (4) consists of multiple independent tanks for storing ammonia nitrogen wastewater. Each tank is connected to a sealed cavity formed by a heating base plate (202), a heating outer shell (203), and a heating inner shell (204) through a pipe with a built-in one-way valve. The outlet end of each pipe extends to the bottom of the sealed cavity.

5. The membrane distillation-air stripping combined equipment for ammonia nitrogen wastewater according to claim 2, characterized in that: The observation window (207) is made of high-temperature resistant transparent material, with an anti-fog coating on its surface and liquid level markings on its outer edge.

6. The membrane distillation-air stripping combined equipment for ammonia nitrogen wastewater according to claim 3, characterized in that: The turbulence block (206) is a hemispherical or trapezoidal protrusion structure, which is equidistantly arranged along the inner wall of the heating shell (203). The distance between two adjacent rows of turbulence blocks (206) is 1.5-2 times the diameter of the guide hole (205).

7. The membrane distillation-air stripping combined equipment for ammonia nitrogen wastewater according to claim 1, characterized in that: The heater (201) is an electric heating tube or an electromagnetic heating device, and its heating part is evenly embedded inside the heating base plate (202), and the bottom of the heating base plate (202) is provided with heat dissipation fins.

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