Gas-phase filtering type sewage purifier

Abstract

Sewage enters from a heat recovery heat exchanger, the heat recovery heat exchanger and a main heater are sequentially connected to a middle inlet of a flash tower, and a top outlet of the flash tower is sequentially connected with a metal filter and a non-metal filter; filtering outlets of the metal filter and the non-metal filter are connected with a top inlet of the flash tower; a gas-phase outlet of the non-metal filter is connected with a heat recovery heat exchanger and is sequentially connected with a clear water temporary storage tank and a clear water pump after condensation, and clear water is discharged by the clear water pump; a bottom outlet of the flash tower is sequentially connected with a tower bottom pump and a centrifugal machine; a liquid phase outlet of the centrifugal machine is sequentially connected with a sewage temporary storage tank and a sewage pump, and the sewage pump is connected with the heat recovery heat exchanger to form a recirculation loop. According to the utility model, the defect that the filter material is easy to block in the traditional liquid phase treatment is overcome, the metal and nonmetal filter materials are combined for collaborative purification, the purification efficiency is obviously improved, and efficient decontamination is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of industrial sewage purification, specifically relates to a gas phase filtration type sewage purifier. BACKGROUND

[0002] With the rapid development of industrialization and urbanization, the efficiency and effect of sewage treatment have become the core challenge in the field of environmental protection. Traditional sewage purification technology mainly relies on physical filtration, chemical precipitation or biological degradation, but when dealing with sewage containing high viscosity pollutants or complex components, it often faces problems such as filter material blockage, high energy consumption, secondary pollution, etc., making it difficult to achieve efficient cleaning and resource recovery.

[0003] In the prior art, the internal molecules of sewage are diffused due to suspended dissolution, the flow viscosity becomes complex, and the gas-liquid-solid separation is difficult due to the change of surface activity. For example, too much suspended dissolved matter causes heat transfer to be blocked when heated, resulting in surface solidification and burnt paper; too much dissolved matter causes the filter medium to be saturated and clogged; and too many bubbles caused by surfactants make the interface unclear. By changing from liquid to gas, the viscosity can be reduced, the free path between molecules can be improved, and the separation of substances can be facilitated. Therefore, some schemes attempt to improve the purification efficiency by gas phase filtration, such as treating the sewage after gasification. However, such methods often cannot effectively remove corrosive gases and volatile organic compounds during gas phase separation, resulting in unstable water quality after purification. In addition, the existing gas phase filtration system lacks an efficient recycling mechanism, residual liquid is not completely treated, equipment maintenance is frequent, and operating costs are high. Therefore, there is an urgent need for an efficient sewage purification device that integrates gas phase filtration, multi-stage purification and recycling. SUMMARY

[0004] To solve the above problems existing in the prior art, the utility model provides a gas phase filtration type sewage purifier. The technical problem to be solved by the utility model is solved by the following technical scheme:

[0005] The utility model provides a kind of gas phase filtration type sewage purifier, comprising: heat recovery heat exchanger, main heater, flash tower, metal filter, non-metal filter, clean water temporary storage tank, clean water pump, tower bottom pump, centrifuge, sewage temporary storage tank and sewage pump, wherein, sewage enters by the heat recovery heat exchanger, the heat recovery heat exchanger and the main heater are sequentially connected to the middle part inlet of the flash tower, and the top outlet of the flash tower is sequentially connected the metal filter and the non-metal filter;The filtering outlet of the metal filter and the non-metal filter is all connected the top inlet of the flash tower;The gas phase outlet of the non-metal filter is connected the heat recovery heat exchanger, and after condensation, it is sequentially connected the clean water temporary storage tank and the clean water pump, and clean water is discharged by the clean water pump;The bottom outlet of the flash tower is sequentially connected the tower bottom pump and the centrifuge, and sludge is discharged by the centrifuge;The liquid phase outlet of the centrifuge is sequentially connected the sewage temporary storage tank and the sewage pump, and the sewage pump is connected the heat recovery heat exchanger, forming recirculation loop.

[0006] In an embodiment of the utility model, the heat recovery heat exchanger is a floating head type tube heat exchanger;The main heater is an electric heating heat exchanger, and the liquid phase feeding mode of the main heater is down-in and up-out, and the gas phase feeding mode is up-in and down-out.

[0007] In an embodiment of the utility model, the middle part of the flash tower is provided with flash packing, and the top is provided with demisting packing.

[0008] In an embodiment of the utility model, the flash packing is DN50 stainless steel bower ring, the thickness of the flash packing is 2-4 times of the inner diameter of the flash tower;The thickness of the demisting packing is less than or equal to 0.5 meters, and the demisting packing is 250Y type stainless steel packing.

[0009] In an embodiment of the utility model, the tower body of the flash tower is provided with first manhole and second manhole, the bottom of the flash tower is provided with liquid level meter, and the liquid level meter is magnetic float liquid level meter;The tower body of the flash tower is provided with pressure sensor and temperature sensor.

[0010] In an embodiment of the utility model, the metal filter is vertical tank structure, and is provided with metal filter layer inside, and the metal filter layer is metal processing cutting chips.

[0011] In an embodiment of the utility model, the non-metal filter is vertical tank structure, and is provided with non-metal filter layer inside, and the non-metal filter layer is granular activated carbon and flaky sulphur.

[0012] In an embodiment of the utility model, the clean water pump is provided with a first lateral pipeline, the first lateral pipeline is connected with the top of metal filter and nonmetal filter respectively, and is used for backwashing.

[0013] In an embodiment of the utility model, the tower bottom pump is provided with a second lateral pipeline, and the second lateral pipeline is connected to the heat recovery heat exchanger.

[0014] In an embodiment of the utility model, the tower bottom pump is a screw pump, the clean water pump and the sewage pump are all self-suction centrifugal pumps, and the inlet of the clean water pump, the tower bottom pump and the sewage pump are all provided with a filtering device.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] The gas phase filtration type sewage purifier of the utility model forms gas phase through flash vaporization of sewage, removes corrosive gas through metal filter in turn, adsorbs organic gas through nonmetal filter, and then condenses and liquefies into clean water through heat recovery.

[0017] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are described in detail, and the accompanying drawings are as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of a gas phase filtration type sewage purifier provided by the embodiment of the utility model.

[0019] Figure legend: 1-heat recovery heat exchanger, 2-main heater, 3-flash tower, 4-metal filter, 5-nonmetal filter, 6-clean water temporary storage tank, 7-clean water pump, 8-tower bottom pump, 9-centrifuge, 10-sewage temporary storage tank, 11-sewage pump. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the following will be described in detail in combination with the drawings and specific embodiments.

[0021] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the specific embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve the intended purpose. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the technical solution of this utility model.

[0022] Example 1

[0023] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a gas phase filtration wastewater purifier provided in an embodiment of this utility model.

[0024] In this embodiment, the gas-phase filtration wastewater purifier includes: a heat recovery heat exchanger 1, a main heater 2, a flash tower 3, a metal filter 4, a non-metal filter 5, a clean water storage tank 6, a clean water pump 7, a tower bottom pump 8, a centrifuge 9, a wastewater storage tank 10, and a wastewater pump 11. Wastewater enters through the heat recovery heat exchanger 1. The heat recovery heat exchanger 1 and the main heater 2 are sequentially connected to the middle inlet of the flash tower 3. The top outlet of the flash tower 3 is sequentially connected to the metal filter 4 and the non-metal filter 5. The filter outlets of both the metal filter 4 and the non-metallic filter 5 are connected to the top inlet of the flash tower 3; the gas phase outlet of the non-metallic filter 5 is connected to the heat recovery heat exchanger 1, and after condensation, it is connected to the clean water storage tank 6 and the clean water pump 7 in sequence, and the clean water is discharged by the clean water pump 7; the bottom outlet of the flash tower 3 is connected to the bottom pump 8 and the centrifuge 9 in sequence, and the sludge is discharged by the centrifuge 9; the liquid phase outlet of the centrifuge 9 is connected to the sewage storage tank 10 and the sewage pump 11 in sequence, and the sewage pump 11 is connected to the heat recovery heat exchanger 1 to form a recirculation loop.

[0025] It is worth noting that existing wastewater purification devices suffer from a disconnect between gas-phase filtration and liquid-phase treatment, making it difficult to synergistically remove multiple pollutants. For example, residual corrosive gases can easily damage equipment, and residual organic gases affect water quality; a single filter material cannot address all these issues. The gas-phase filtration wastewater purifier in this embodiment achieves efficient, stepwise removal of gaseous pollutants through the synergistic design of a metal filter 4 and a non-metallic filter 5. The metal filter layer effectively neutralizes corrosive gases (such as acidic and alkaline gases, reactive organic gases, and mercury vapor) through the chemical reaction of metal cutting chips, reducing corrosion to the equipment. The non-metallic filter layer uses a mixture of activated carbon and sulfur to adsorb and catalytically decompose organic gases, eliminating odors. The two filters have clearly defined functions and strong complementarity, avoiding the functional limitations of a single filter material while ensuring gaseous cleanliness through multi-stage purification, extending equipment lifespan, and simplifying maintenance procedures.

[0026] Furthermore, existing wastewater treatment devices lack a closed-loop design, leading to resource waste and difficulty in achieving long-term stable operation. The gas-phase filtration wastewater purifier in this embodiment reintroduces incompletely treated wastewater into the purification process through a recirculation loop, significantly improving resource utilization efficiency. After centrifugal separation, the residual liquid phase is discharged as sludge, and the wastewater is returned to the heat recovery heat exchanger 1 for further gasification, reducing wastewater discharge and raw material waste. This recirculation design not only reduces energy consumption and operating costs but also ensures long-term stable system operation through continuous optimization of the treatment process.

[0027] In one optional embodiment, the heat recovery heat exchanger 1 is a floating head tube heat exchanger; the main heater 2 is an electric heating heat exchanger, and the liquid phase feed method of the main heater 2 is bottom inlet and top outlet, and the gas phase feed method is top inlet and bottom outlet.

[0028] In one optional embodiment, the flash tower 3 is provided with flash packing in the middle and with demister packing at the top.

[0029] In one optional embodiment, the flash packing is a DN50 stainless steel Pall ring, and the thickness of the flash packing is 2 to 4 times the inner diameter of the flash tower 3; the thickness of the demister packing is less than or equal to 0.5 meters, and the demister packing is a 250Y type stainless steel packing.

[0030] In one optional embodiment, the flash tower 3 has a first maintenance manhole and a second maintenance manhole on its tower body, and a level gauge, which is a magnetic float level gauge, is installed at the bottom of the flash tower 3; a pressure sensor and a temperature sensor are installed on the tower body of the flash tower 3.

[0031] In one optional embodiment, the metal filter 4 is a vertical tank structure with an internal metal filter layer containing metal processing chips.

[0032] For example, the vertical tank structure of the metal filter 4 has a height-to-diameter ratio of 2 to 4 and a filling factor of 0.7 to 0.9.

[0033] For example, metalworking chips can be a mixture of carbon steel chips, aluminum chips, magnesium chips and copper chips, with carbon steel chips being the main component.

[0034] Understandably, the internal capacity of the metal filter layer of the metal filter 4 can be determined according to actual use, at least to meet the requirement of maintaining at least 6 months of use with 50% of the volume capacity.

[0035] In one optional embodiment, the non-metallic filter 5 is a vertical tank structure with an internal non-metallic filter layer consisting of granular activated carbon and flake sulfur. The filter outlet of the non-metallic filter 5 is connected to the top inlet of the flash tower 3, meaning that the incompletely filtered liquid phase returns to the flash tower 3, while the purified gas phase enters the heat recovery heat exchanger 1 and is condensed into clean water.

[0036] For example, the height-to-diameter ratio of the vertical tank structure of the non-metallic filter 5 is 2 to 4, and the filling factor is 0.7 to 0.9.

[0037] For example, the non-metallic filter layer is large-particle activated carbon, and 1% to 5% by mass of flake sulfur can be added.

[0038] Understandably, the internal capacity of the non-metallic filter layer of the non-metallic filter 5 can be determined according to actual use, at least to meet the requirement of maintaining at least 50% of the volume capacity for at least 6 months of use.

[0039] In an optional embodiment, the clean water pump 7 is provided with a first lateral pipeline, which is connected to the top of the metal filter 4 and the non-metal filter 5 respectively, for backwashing.

[0040] Specifically, the first lateral pipeline is used for backwashing the metal filter 4 and the non-metal filter 5. By periodically reverse-flowing clean water, impurities adsorbed on the surface of the filter media are removed, preventing filter layer blockage and maintaining filtration efficiency. The backwash liquid is returned to the flash tower via a drain valve.

[0041] In an optional embodiment, the bottom pump 8 is provided with a second lateral pipeline, which is connected to the heat recovery heat exchanger 1, and is connected to the middle inlet on the side of the flash tower 3 via the main heater 2 (bottom inlet, top outlet).

[0042] Specifically, the second lateral pipeline is used for system dynamic balancing and heat recovery, ensuring stable liquid concentration within the flash tower 3 while improving energy utilization efficiency. During initial system operation, the bottom pump 8 transports the insufficiently concentrated liquid phase from the bottom of the flash tower 3 to the heat recovery heat exchanger 1 via the second lateral pipeline. After mixing with the newly introduced wastewater, it is reheated and vaporized, accelerating the establishment of system thermal balance. Once balance is established, the system can be shut down.

[0043] In one optional embodiment, the bottom pump 8 is a screw pump, the clean water pump 7 and the sewage pump 11 are both self-priming centrifugal pumps, and the inlets of the clean water pump 7, the bottom pump 8 and the sewage pump 11 are all equipped with filtration devices.

[0044] For example, the filtration device is a Y-type filter.

[0045] Understandably, in this utility model's gas-phase filtration wastewater purifier, the main materials of the equipment, pipes, pumps, valves, and instruments are all corrosion-resistant stainless steel. The design pressure is 1.0 MPa, and the working pressure does not exceed 0.6 MPa. The electrical automatic control meets explosion-proof and communication requirements; the insulation of the equipment and pipes meets the temperature requirements of the operating environment. The above is only for illustrating the technical solution; in actual applications, parameters can be adjusted according to the working conditions.

[0046] The working process of this gas-phase filtration wastewater purifier is as follows:

[0047] External pressurized wastewater passes through heat recovery heat exchanger 1, where it exchanges heat with steam before being heated to over 150°C by the main heater 2. It then enters the middle inlet of flash tower 3 at a pressure of 0.6 MPa, where it rapidly vaporizes. The vapor rises through the demister packing and enters the lower part of metal filter 4 from the top outlet. The vapor continues upward through the metal filter layer within metal filter 4. The acidic and alkaline corrosive gases, reactive organic gases, and mercury vapor contained in the gas react fully with various metal processing chips in the metal filter layer, consuming the corrosive properties of the vapor and forming a slurry that drips down. The slurry containing metal ions exits through the bottom of metal filter 4, passes through a drain valve, and returns to flash tower 3 from the top inlet, flowing downwards into the liquid phase.

[0048] The gas passing through the metal filter 4 exits from the top and enters from the bottom of the non-metallic filter 5. The entrained distilled organic gases are fully absorbed by the non-metallic filter layer, a mixture of large-particle activated carbon and flake sulfur. The activated carbon interface catalyzes polymerization, and the sulfur oxidizes the gases, further forming a slurry layer. This slurry carries adsorbed corrosive polymer oxides and drips to the bottom. The slurry exits through the bottom of the non-metallic filter 5, passes through a steam trap, and returns to the flash tower 3 from the top inlet, flowing downwards into the liquid phase. The colorless and odorless gas phase exits from the top of the non-metallic filter 5, exchanges heat with the feed in the heat recovery heat exchanger 1, and liquefies into clear water, which enters the clear water storage tank 6.

[0049] The water level in the temporary storage tank 6 is automatically controlled, and the water pump 7 discharges excess water. The water pump 7 is equipped with a first lateral pipeline, which returns to the top of the metal filter 4 and the non-metal filter 5. It can perform continuous backwashing at a small flow rate or intermittent backwashing at a large flow rate. The washing liquid, along with the filtered product, returns to the top of the flash tower 3 from the side after passing through the drain valve, and flows downward into the liquid phase.

[0050] The liquid phase inside flash tower 3 further expands the evaporation interface through the flash packing, prolongs the evaporation time and fully vaporizes. The residual concentrate is discharged from the bottom outlet of flash tower 3 and transported by bottom pump 8.

[0051] The outlet of the bottom pump 8 branches off, with the first branch entering the centrifuge 9, where it is centrifuged and separated into sludge and wastewater; the other branch, via a second side pipeline, returns to the liquid phase inlet of the heat recovery heat exchanger 1, where it mixes with the feed wastewater to form a self-circulation, used when the flash tower 3 has not yet established an evaporation balance; once the evaporation balance in the flash tower 3 is established and the concentration reaches the standard, it is switched off and all of it enters the centrifuge 9, and is then returned by the wastewater storage tank 10 and wastewater pump 11 to the liquid phase inlet of the heat recovery heat exchanger 1, where it mixes with the feed wastewater to form a recirculation loop.

[0052] It is worth noting that the cascaded use of metal filter 4 and non-metal filter 5 ensures clean gas phase filtration, with impurities forming liquid phase return, and metal ions promoting flocculation in the liquid phase into solid phase, which is beneficial to the operation of centrifuge 9.

[0053] In this embodiment, the flash tower 3 functions similarly to the forced heating and flash vaporization of a steam boiler, concentrating energy and pressure, and also possessing partial thermal decomposition and polymerization functions to promote scale formation. The flash packing is flushed by spraying to prevent scale accumulation and solidification within the tower. After being carried out at high speed by the bottom pump 8, it is promptly separated by the centrifuge 9, ensuring the long-term internal cleanliness of the gas-phase filtration wastewater purifier in this embodiment and maximizing maintenance-free operation. The sludge can be solidified into ceramic slag through incineration for safe return to nature, or disposed of in sanitary landfills, or mixed with cement for use as building materials.

[0054] This utility model discloses a gas-phase filtration wastewater purifier. Wastewater is flash-vaporized into a gas phase, which is then passed sequentially through a metal filter to remove corrosive gases and a non-metal filter to adsorb organic gases. After heat recovery, the gas is condensed and liquefied into clean water. The vaporized residue is separated into sludge by a centrifuge, and the liquid components are recycled and re-vaporized. The recirculation loop design ensures long-term stable operation, guarantees the simultaneous removal of corrosive and organic pollutants, and extends equipment lifespan. By improving the molecular free path to form a gas phase, gas-phase filtration technology overcomes the interference of liquid-phase viscosity, overcoming the clogging defects of traditional liquid-phase treatment filters. The combination of metal and non-metal filter media for synergistic purification significantly improves purification efficiency, and the purification process is simple and reliable.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0056] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A gas-phase filtration wastewater purifier, characterized in that, include: The system includes a heat recovery heat exchanger (1), a main heater (2), a flash tower (3), a metal filter (4), a non-metal filter (5), a clean water storage tank (6), a clean water pump (7), a tower bottom pump (8), a centrifuge (9), a sewage storage tank (10), and a sewage pump (11). Wastewater enters through the heat recovery heat exchanger (1), and the heat recovery heat exchanger (1) and the main heater (2) are connected in sequence to the middle inlet of the flash tower (3). The top outlet of the flash tower (3) is connected in sequence to the metal filter (4) and the non-metal filter (5). The filter outlets of the metal filter (4) and the non-metal filter (5) are both connected to the top inlet of the flash tower (3); The gas phase outlet of the non-metallic filter (5) is connected to the heat recovery heat exchanger (1), and after condensation, it is connected in sequence to the clean water storage tank (6) and the clean water pump (7), and the clean water is discharged by the clean water pump (7). The bottom outlet of the flash tower (3) is connected in sequence to the bottom pump (8) and the centrifuge (9), and the sludge is discharged from the centrifuge (9); The liquid phase outlet of the centrifuge (9) is connected in sequence to the sewage temporary storage tank (10) and the sewage pump (11), and the sewage pump (11) is connected to the heat recovery heat exchanger (1) to form a recirculation loop.

2. The gas-phase filtration wastewater purifier according to claim 1, characterized in that, The heat recovery heat exchanger (1) is a floating head tube heat exchanger; the main heater (2) is an electric heating heat exchanger. The liquid phase feed method of the main heater (2) is bottom inlet and top outlet, and the gas phase feed method is top inlet and bottom outlet.

3. The gas-phase filtration wastewater purifier according to claim 1, characterized in that, The flash tower (3) is provided with flash packing in the middle and with demisting packing at the top.

4. The gas-phase filtration wastewater purifier according to claim 3, characterized in that, The flash packing is a DN50 stainless steel Pall ring, and the thickness of the flash packing is 2 to 4 times the inner diameter of the flash tower (3); the thickness of the demister packing is less than or equal to 0.5 meters, and the demister packing is a 250Y type stainless steel packing.

5. The gas-phase filtration wastewater purifier according to claim 1, characterized in that, The flash tower (3) has a first maintenance manhole and a second maintenance manhole on its tower body. A level gauge is installed at the bottom of the flash tower (3), and the level gauge is a magnetic float level gauge. A pressure sensor and a temperature sensor are installed on the tower body of the flash tower (3).

6. The gas-phase filtration wastewater purifier according to claim 1, characterized in that, The metal filter (4) is a vertical tank structure with a metal filter layer inside, which is metal processing cutting chips.

7. The gas-phase filtration wastewater purifier according to claim 1, characterized in that, The non-metallic filter (5) is a vertical tank structure with a non-metallic filter layer inside, which consists of granular activated carbon and flake sulfur.

8. The gas-phase filtration wastewater purifier according to claim 1, characterized in that, The water pump (7) is equipped with a first lateral pipeline, which is connected to the top of the metal filter (4) and the non-metal filter (5) respectively, for backwashing.

9. The gas-phase filtration wastewater purifier according to claim 1, characterized in that, The bottom pump (8) is provided with a second lateral pipeline, which is connected to the heat recovery heat exchanger (1).

10. The gas-phase filtration wastewater purifier according to claim 1, characterized in that, The bottom pump (8) is a screw pump, the clean water pump (7) and the sewage pump (11) are both self-priming centrifugal pumps, and the inlet of the clean water pump (7), the bottom pump (8) and the sewage pump (11) are all equipped with a filter device.

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