A methanol wastewater treatment device with quality-based pretreatment

Abstract

The utility model relates to wastewater treatment technical field, proposes a kind of methanol wastewater treatment device of quality pretreatment, including mounting bracket, and one end of mounting bracket top is fixedly connected with pretreatment box, and the top of pretreatment box is fixedly connected with wastewater inlet pipe, and the import end of wastewater inlet pipe is connected with wastewater classification pipe network, and the bottom of pretreatment box is connected with distillation tank by conduit, and the upper and lower ends of distillation tank inside are all fixedly connected with sealing plate, and several heat pipes are fixedly connected between two sealing plates, and the bottom of distillation tank is fixedly connected with steam inlet pipe, and the import end of steam inlet pipe is connected with steam generator, and the top of distillation tank is fixedly connected with steam outlet pipe, and the top of distillation tank is fixedly connected with exhaust pipe, and the bottom of distillation tank is fixedly connected with drain pipe, and the outlet end of exhaust pipe is provided with negative pressure mechanism, and the outlet end of negative pressure mechanism is connected with heat recovery pipe fitting.The utility model uses indirect heating mode, solves the wastewater local overheating problem caused by direct heating in prior art.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a methanol wastewater treatment device with fractional pretreatment. Background Technology

[0002] Methanol production wastewater is characterized by complex pollutant composition and significant concentration variations. Separate pretreatment is a key strategy for efficient and economical treatment. Its core lies in classifying and treating wastewater according to its source, composition characteristics, and pollutant concentration, avoiding mixing wastewaters with significantly different properties that could negatively impact treatment effectiveness or increase treatment difficulty and cost. The main sources of methanol production wastewater include distillation column wastewater, alcohol-containing process wastewater, equipment cleaning wastewater, floor flushing water, and boiler blowdown. Among these, distillation column wastewater is high-concentration wastewater, with high-concentration methanol as its primary pollutant. Current treatment technologies primarily utilize the boiling point difference between methanol and water, recovering higher-purity methanol through distillation / stripping towers (for reuse or sale), significantly reducing the methanol concentration and COD in the wastewater. This is the most mainstream and crucial pretreatment measure.

[0003] For example, Chinese Patent (Publication No.: CN216584610U) discloses "a distillation device for treating high-concentration methanol wastewater, including a box body, a support fixedly installed at the upper end of the box body, a pretreatment box fixedly installed at the upper end of the support, an inlet pipe connected to one side of the pretreatment box, an outlet pipe connected to the other side of the pretreatment box, a hollow tube rotatably inserted into the upper end of the box body via a bearing, the upper end of the hollow tube rotatably connected to one end of the outlet pipe, the lower end of the hollow tube located inside the box body, a horizontal tube fixedly connected to the lower end of the hollow tube, the horizontal tube communicating with the hollow tube, multiple sets of nozzles connected to the lower side of the horizontal tube, the multiple sets of nozzles arranged at equal intervals, a heating mechanism provided inside the box body, a heating wire fixedly installed inside the pretreatment box, and a filter plate detachably installed inside the pretreatment box, the heating wire and the filter plate being located between the inlet pipe and the outlet pipe."

[0004] However, the above-mentioned technical solutions have certain technical defects in the process of implementing the relevant technologies:

[0005] First, the patent directly heats the wastewater through the heating plate of the distillation plate. Since the heating plate does not have a precise temperature control system, it is easy to cause local overheating during actual operation. Methanol is prone to thermal polymerization at >95℃ to generate byproducts such as dimethyl ether, which reduces the methanol recovery rate.

[0006] Secondly, the V-shaped structure of the distillation plate in this patent causes the wastewater to concentrate at the lowest point under the action of gravity, which not only leads to uneven heating of the wastewater, but also results in low utilization of other heating areas of the distillation plate, causing energy waste; moreover, the methanol gas that is heated and evaporated contains a certain amount of heat, and this patent does not perform heat recovery on the methanol gas, which further leads to energy waste.

[0007] Third, after the filter screen filters impurities in the wastewater, a large amount of impurities will adhere to the surface of the filter screen. As the impurities accumulate, they will cause the filter screen pores to become clogged, which requires frequent shutdowns for cleaning, greatly reducing the wastewater treatment efficiency.

[0008] In view of this, the present invention proposes a methanol wastewater treatment device with separate pretreatment. Utility Model Content

[0009] This invention proposes a methanol wastewater treatment device with fractional pretreatment, which solves the problem in the prior art that the wastewater is prone to local overheating during the heating process, resulting in the generation of by-products and a decrease in methanol recovery rate.

[0010] The technical solution of this utility model is as follows: A methanol wastewater treatment device with fractional pretreatment includes a mounting frame. A pretreatment box is fixedly connected to one end of the top of the mounting frame. A wastewater inlet pipe is fixedly connected to the top of the pretreatment box. The inlet end of the wastewater inlet pipe is connected to a wastewater classification network. A distillation tank is connected to the bottom of the pretreatment box through a conduit. Sealing plates are fixedly connected to both the upper and lower ends of the inner side of the distillation tank. Several evenly distributed heat-conducting pipes are fixedly connected between the two sealing plates. A steam inlet pipe communicating with the heat-conducting pipes is fixedly connected to the bottom of the distillation tank. A steam generator is connected to the inlet end of the steam inlet pipe. A water tank is connected to the inlet of the steam generator through a conduit. A steam outlet pipe communicating with the heat-conducting pipes is fixedly connected to the top of the distillation tank. The outlet end of the steam outlet pipe is connected to the inside of the water tank. An exhaust pipe is fixedly connected to the top of the distillation tank. A drain pipe is fixedly connected to the bottom of the distillation tank. A negative pressure mechanism is provided at the outlet end of the exhaust pipe. A heat recovery pipe fitting installed inside the water tank is connected to the outlet end of the negative pressure mechanism.

[0011] Preferably, a plurality of baffles are provided between the two sealing plates, which are staggered in the vertical direction. The baffles are all fixedly connected to the inner wall of the distillation tank, and the baffles form an S-shaped channel.

[0012] Preferably, the negative pressure mechanism includes a box fixedly connected to the top of the mounting frame, the air inlet end of the box being connected to the exhaust pipe, a rotating shaft rotatably connected to the inner side of the box and passing through the side wall of the box, one end of the rotating shaft being fixedly connected to a suction impeller, a motor being fixedly installed on the outer side of the mounting frame, the output shaft of the motor being fixedly connected to the rotating shaft, and an air outlet pipe being fixedly connected to the air outlet end of the box.

[0013] Preferably, the heat recovery pipe fitting includes a heat exchange coil fixedly connected inside the water tank, the inlet end of the heat exchange coil being connected to the gas outlet pipe, and the outlet end of the heat exchange coil being fixedly connected to a methanol recovery pipe.

[0014] Preferably, a filter screen is fixedly connected to the middle of the inner side of the pretreatment box, and a cleaning mechanism is provided on the inner side of the pretreatment box to clean the filter screen by cooperating with the start of a motor.

[0015] Preferably, the cleaning mechanism includes a reciprocating screw rotatably connected to the inside of the pretreatment box, a slider threaded onto the reciprocating screw, a connecting rod fixedly connected to the bottom of the slider, a scraper fixedly connected to the bottom of the connecting rod, the scraper being slidably connected to the top wall of the filter screen, and a transmission component provided at one end of the reciprocating screw to drive the reciprocating screw to rotate by cooperating with the start of a motor.

[0016] Preferably, the top wall inside the pretreatment box is fixedly connected to a guide rail arranged parallel to the reciprocating lead screw, and the top end of the slider is slidably connected to the guide rail.

[0017] Preferably, the transmission component includes a first bevel gear fixedly connected to the motor output shaft, a second bevel gear meshing with the first bevel gear rotatably connected to the top of the mounting bracket, a first pulley fixedly connected to the second bevel gear coaxially, a second pulley fixedly connected to the end of the reciprocating screw, and the second pulley and the first pulley being connected by a belt drive.

[0018] The working principle and beneficial effects of this utility model are as follows:

[0019] 1. By installing a sealing plate and heat-conducting pipe inside the distillation tank, steam enters the heat-conducting pipe through the steam inlet pipe, and wastewater flows and exchanges heat on the outside. Because the heat-conducting pipe is evenly distributed and the wastewater has good flowability, hot spots are avoided. This indirect heating method solves the problem of local overheating of wastewater caused by direct heating in the existing technology.

[0020] 2. The S-shaped channel formed by the baffle plate significantly extends the flow path of wastewater in the distillation tank, solving the problems of concentrated wastewater accumulation and uneven heating caused by the existing V-shaped structure. This not only improves the methanol evaporation efficiency but also reduces energy waste.

[0021] 3. By using a motor-driven suction impeller to quickly extract gas, the residence time of methanol in a high-temperature environment is reduced, thus solving the problem of thermal byproducts caused by methanol gas retention.

[0022] 4. Through the coordinated design of heat recovery pipe fittings and steam outlet pipes, efficient recycling of energy is achieved. The heat recovery pipe fittings use the waste heat of methanol gas to preheat the water in the water tank, while the steam outlet pipes recover condensed steam to the water tank. This reduces the energy consumption of the steam generator and saves water resources, which is in line with the concept of environmental protection and energy conservation.

[0023] 5. The design of the cleaning mechanism solves the problem of frequent shutdowns due to filter clogging. This mechanism automatically cleans impurities by driving a scraper through motor linkage, avoiding manual intervention and reducing downtime, which greatly improves wastewater treatment efficiency. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of a methanol wastewater treatment device with fractional pretreatment according to the present invention. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of a methanol wastewater treatment device with fractional pretreatment according to the present invention. Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the internal structure of the distillation tank of this utility model;

[0028] Figure 4 This is a schematic diagram of the negative pressure mechanism of this utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the heat recovery pipe fitting of this utility model;

[0030] Figure 6 This is a schematic diagram of the cleaning mechanism of this utility model;

[0031] Figure 7 This is a schematic diagram of the transmission component of this utility model.

[0032] In the diagram: 1. Mounting frame; 2. Pretreatment box; 3. Wastewater inlet pipe; 4. Filter screen; 5. Distillation tank; 52. Drain pipe; 53. Baffle plate; 6. Sealing plate; 7. Heat pipe; 8. Steam inlet pipe; 9. Steam generator; 10. Water tank; 11. Steam outlet pipe; 12. Exhaust pipe; 13. Negative pressure mechanism; 131. Box body; 132. Rotating shaft; 133. Suction impeller; 134. Motor; 135. 14. Exhaust pipe; 14. Heat recovery pipe fittings; 141. Heat exchange coil; 142. Methanol recovery pipe; 15. Cleaning mechanism; 151. Reciprocating screw; 152. Slider; 153. Guide rail; 154. Connecting rod; 155. Scraper; 156. Transmission component; 1561. First bevel gear; 1562. Second bevel gear; 1563. First pulley; 1564. Second pulley; 100. Wastewater classification pipe network. Detailed Implementation

[0033] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0034] like Figures 1 to 7 As shown, this embodiment proposes a methanol wastewater treatment device with fractional pretreatment, including a mounting frame 1. A pretreatment tank 2 is fixedly connected to one end of the top of the mounting frame 1. A filter screen 4 is fixedly connected to the middle of the inner side of the pretreatment tank 2. A wastewater inlet pipe 3 is fixedly connected to the top of the pretreatment tank 2. The inlet end of the wastewater inlet pipe 3 is connected to the wastewater classification network 100. A distillation tank 5 is connected to the bottom of the pretreatment tank 2 through a conduit. Sealing plates 6 are fixedly connected to both the upper and lower ends of the inner side of the distillation tank 5. Several evenly distributed heat-conducting pipes 7 are fixedly connected between the two sealing plates 6. The bottom of the distillation tank 5 is fixedly connected to the bottom of the tank. A steam inlet pipe 8 is fixedly connected to the heat-conducting pipe 7. A steam generator 9 is connected to the inlet end of the steam inlet pipe 8. The water inlet of the steam generator 9 is connected to the water tank 10 through a conduit. A steam outlet pipe 11 connected to the heat-conducting pipe 7 is fixedly connected to the top of the distillation tank 5. The outlet end of the steam outlet pipe 11 is connected to the inside of the water tank 10. An exhaust pipe 12 is fixedly connected to the top of the distillation tank 5. A drain pipe 52 is fixedly connected to the bottom of the distillation tank 5. A negative pressure mechanism 13 is provided at the outlet end of the exhaust pipe 12. A heat recovery pipe fitting 14 is provided inside the water tank 10 at the outlet end of the negative pressure mechanism 13.

[0035] Methanol wastewater is introduced into the pretreatment tank 2 through wastewater inlet pipe 3. Large particles of impurities are then filtered out by filter screen 4. The wastewater is then introduced into the distillation tank 5 through the outlet pipe of the pretreatment tank 2 and comes into contact with the heat transfer pipe 7. The steam generator 9 is started to generate high-temperature steam, which is then introduced into the bottom of the distillation tank 5 through steam inlet pipe 8. The steam is then diverted into different heat transfer pipes 7, allowing the wastewater to exchange heat with the high-temperature steam through the heat transfer pipes 7. Since the boiling point of methanol is lower than that of water, the methanol in the wastewater evaporates into gas after being heated. Because the wastewater has a certain degree of fluidity and is in uniform contact with the heat transfer pipes 7, the heat transfer pipes 7 are heated evenly, avoiding the problem of local overheating and the generation of by-products that reduce the methanol recovery rate.

[0036] Furthermore, a number of baffles 53 are arranged between the two sealing plates 6 in a staggered manner along the vertical direction. The baffles 53 are all fixedly connected to the inner wall of the distillation tank 5, and the baffles 53 form an S-shaped channel.

[0037] After the wastewater is introduced into the distillation tank 5, it flows in a curved path under the guidance of multiple baffles 53. This greatly prolongs the flow path of the wastewater, extends the contact time between the wastewater and the heat-conducting pipe 7, allows the wastewater to fully absorb heat and completely evaporate the methanol in the wastewater, and further improves the methanol recovery efficiency.

[0038] Furthermore, the negative pressure mechanism 13 includes a housing 131 fixedly connected to the top of the mounting bracket 1. The air inlet end of the housing 131 is connected to the exhaust pipe 12. A rotating shaft 132 that passes through the side wall of the housing 131 is rotatably connected to the inner side of the housing 131. A suction impeller 133 is fixedly connected to one end of the rotating shaft 132. A motor 134 is fixedly installed on the outer side of the mounting bracket 1. The output shaft of the motor 134 is fixedly connected to the rotating shaft 132. An air outlet pipe 135 is fixedly connected to the air outlet end of the housing 131.

[0039] By starting the motor 134 to drive the suction impeller 133 to rotate, the internal pressure of the housing 131 is reduced, which causes the exhaust pipe 12 to quickly draw out the gas inside the distillation tank 5. This can accelerate the flow rate of the gas inside the distillation tank 5, so that the evaporated methanol gas can be quickly discharged, avoiding the problem of methanol gas continuously being heated to produce by-products and reduce the methanol recovery rate.

[0040] Furthermore, the heat recovery pipe fitting 14 includes a heat exchange coil 141 fixedly connected inside the water tank 10. The inlet end of the heat exchange coil 141 is connected to the gas outlet pipe 135, and the outlet end of the heat exchange coil 141 is fixedly connected to a methanol recovery pipe 142.

[0041] Methanol gas can be introduced into the heat exchange coil 141 through the gas outlet pipe 135. Since methanol gas has high heat, the high temperature methanol gas will exchange heat with the water in the water tank 10 through the heat exchange coil 141. This can preheat the water in the water tank 10, thereby reducing the energy consumption of the steam generator 9 in the steam generation process. This not only realizes the distillation and recovery of methanol, but also the recovery and utilization of heat energy, which greatly saves energy consumption.

[0042] Similarly, the steam outlet pipe 11 reintroduces high-temperature steam into the water tank 10, which not only preheats the water inside the tank, but also allows the steam to be reused after condensation, greatly reducing the cost of water use and conforming to the concept of environmental protection and energy conservation.

[0043] Furthermore, a cleaning mechanism 15 is provided inside the pretreatment box 2 to clean the filter screen 4 by cooperating with the start of the motor 134. The cleaning mechanism 15 includes a reciprocating screw 151 rotatably connected to the inside of the pretreatment box 2, a slider 152 threadedly connected to the reciprocating screw 151, a connecting rod 154 fixedly connected to the bottom of the slider 152, a scraper 155 fixedly connected to the bottom of the connecting rod 154, the scraper 155 slidingly connected to the top wall of the filter screen 4, and a guide rail 153 arranged parallel to the reciprocating screw 151 fixedly connected to the top wall of the inside of the pretreatment box 2. The top of the slider 152 is connected to the guide rail. 153 Sliding connection, one end of the reciprocating screw 151 is provided with a transmission component 156 that drives the reciprocating screw 151 to rotate by cooperating with the start of the motor 134. The transmission component 156 includes a first bevel gear 1561 fixedly connected to the output shaft of the motor 134, a second bevel gear 1562 rotatably connected to the top of the mounting bracket 1 that meshes with the first bevel gear 1561, a first pulley 1563 fixedly connected to the second bevel gear 1562 coaxially, and a second pulley 1564 fixedly connected to the end of the reciprocating screw 151. The second pulley 1564 and the first pulley 1563 are connected by belt drive.

[0044] By starting the motor 134, the first bevel gear 1561 is driven to rotate, causing the second bevel gear 1562 to rotate synchronously. This causes the first pulley 1563 to rotate, which in turn causes the second pulley 1564 to drive the reciprocating screw 151 to rotate synchronously. As a result, the slider 152 reciprocates along the axis of the reciprocating screw 151, and the connecting rod 154 drives the scraper 155 to slide back and forth along the top wall of the filter screen 4. This can clean the impurities accumulated on the top surface of the filter screen 4 and prevent the filter holes from being clogged due to excessive local accumulation of impurities on the top surface of the filter screen 4.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A methanol wastewater treatment device with pretreatment of different grades, comprising a mounting frame (1), wherein a pretreatment tank (2) is fixedly connected to one end of the top of the mounting frame (1), and a wastewater inlet pipe (3) is fixedly connected to the top of the pretreatment tank (2), wherein the inlet end of the wastewater inlet pipe (3) is connected to a wastewater classification network (100), characterized in that, The bottom of the pretreatment tank (2) is connected to a distillation tank (5) via a conduit. Both the upper and lower ends of the inner side of the distillation tank (5) are fixedly connected to sealing plates (6). Several evenly distributed heat-conducting pipes (7) are fixedly connected between the two sealing plates (6). The bottom of the distillation tank (5) is fixedly connected to a steam inlet pipe (8) that communicates with the heat-conducting pipes (7). The inlet end of the steam inlet pipe (8) is connected to a steam generator (9). The inlet of the steam generator (9) is connected to a water tank (10) via a conduit. The top of the distillation tank (5) is fixedly connected to a steam outlet pipe (11) that communicates with the heat conduction pipe (7). The outlet end of the steam outlet pipe (11) is connected to the inside of the water tank (10). The top of the distillation tank (5) is fixedly connected to an exhaust pipe (12). The bottom of the distillation tank (5) is fixedly connected to a drain pipe (52). The outlet end of the exhaust pipe (12) is provided with a negative pressure mechanism (13). The outlet end of the negative pressure mechanism (13) is connected to a heat recovery pipe fitting (14) installed inside the water tank (10).

2. The methanol wastewater treatment device with fractional pretreatment according to claim 1, characterized in that, Between the two sealing plates (6), there are several baffles (53) arranged in a staggered manner along the vertical direction. The baffles (53) are all fixedly connected to the inner wall of the distillation tank (5), and the baffles (53) form an S-shaped channel.

3. The methanol wastewater treatment device with fractional pretreatment according to claim 1, characterized in that, The negative pressure mechanism (13) includes a box (131) fixedly connected to the top of the mounting frame (1). The air inlet end of the box (131) is connected to the exhaust pipe (12). The inner side of the box (131) is rotatably connected to a rotating shaft (132) that passes through the side wall of the box (131). One end of the rotating shaft (132) is fixedly connected to a suction impeller (133). A motor (134) is fixedly installed on the outer side of the mounting frame (1). The output shaft of the motor (134) is fixedly connected to the rotating shaft (132). The air outlet end of the box (131) is fixedly connected to an air outlet pipe (135).

4. The methanol wastewater treatment device with fractional pretreatment according to claim 3, characterized in that, The heat recovery pipe fitting (14) includes a heat exchange coil (141) fixedly connected inside the water tank (10). The inlet end of the heat exchange coil (141) is connected to the gas outlet pipe (135), and the outlet end of the heat exchange coil (141) is fixedly connected to a methanol recovery pipe (142).

5. A methanol wastewater treatment device with fractional pretreatment according to claim 3, characterized in that, A filter screen (4) is fixedly connected to the middle of the inner side of the pretreatment box (2), and a cleaning mechanism (15) is provided on the inner side of the pretreatment box (2) to clean the filter screen (4) by cooperating with the start of the motor (134).

6. The methanol wastewater treatment device with fractional pretreatment according to claim 5, characterized in that, The cleaning mechanism (15) includes a reciprocating screw (151) rotatably connected to the inside of the pretreatment box (2). A slider (152) is threaded onto the reciprocating screw (151). A connecting rod (154) is fixedly connected to the bottom of the slider (152). A scraper (155) is fixedly connected to the bottom of the connecting rod (154). The scraper (155) is slidably connected to the top wall of the filter screen (4). One end of the reciprocating screw (151) is provided with a transmission component (156) that drives the reciprocating screw (151) to rotate by cooperating with the start of the motor (134).

7. A methanol wastewater treatment device with fractional pretreatment according to claim 6, characterized in that, The top wall inside the pretreatment box (2) is fixedly connected to a guide rail (153) that is parallel to the reciprocating screw (151), and the top of the slider (152) is slidably connected to the guide rail (153).

8. A methanol wastewater treatment device with fractional pretreatment according to claim 6, characterized in that, The transmission component (156) includes a first bevel gear (1561) fixedly connected to the output shaft of the motor (134), a second bevel gear (1562) rotatably connected to the top of the mounting bracket (1) and meshing with the first bevel gear (1561), a first pulley (1563) fixedly connected to the second bevel gear (1562) on the same axis, a second pulley (1564) fixedly connected to the end of the reciprocating screw (151), and the second pulley (1564) and the first pulley (1563) are connected by belt drive.

Images