Desulfurization wastewater emission reduction and recovery device

Abstract

The utility model discloses a kind of desulfurization wastewater emission reduction recovery devices, including cyclone separator, the one side of cyclone separator is fixedly provided with ceramic membrane filter, ceramic membrane filter one side is fixedly provided with multistage falling-film evaporator, multistage falling-film evaporator is combined by the vertical arrangement of multiple evaporation chambers, evaporation chamber inner wall top is fixedly provided with cloth membrane device, between evaporation chamber, fixedly provided with back gas pipe, multistage falling-film evaporator one side is fixedly provided with condensing tank, the bottom of condensing tank is fixedly provided with recovery water tank;Cyclone separator is primarily separated solid particles by centrifugal force, ceramic membrane filter is further retained small particle and colloid using microporous structure, wastewater turbidity is greatly reduced, multistage falling-film evaporator is concentrated by multiple-effect evaporation principle, and secondary steam generated by evaporation is recycled, and fresh water formed by condensation is recycled by recovery water tank, realize the efficient reuse of water resources, significantly improve the efficiency of wastewater treatment and resource recovery rate.

Description

Technical Field

[0001] This utility model relates to the field of recycling device technology, and in particular to a desulfurization wastewater reduction and recycling device. Background Technology

[0002] In the desulfurization process of coal-fired power plants, steel smelting, and chemical industries, a large amount of desulfurization wastewater containing suspended solids, heavy metal ions, and high concentrations of salt is generated. Direct discharge of this wastewater will cause serious pollution to soil and water bodies. Furthermore, with increasingly stringent environmental policies, enterprises face enormous pressure to treat this wastewater. At the same time, the problem of water scarcity is becoming increasingly prominent, making it urgent for enterprises to treat and reuse desulfurization wastewater to achieve energy conservation, emission reduction, and sustainable development.

[0003] To meet environmental protection requirements and the actual needs of enterprises, desulfurization wastewater treatment equipment must be capable of efficiently removing suspended solids and reducing salt concentration, while maximizing the recycling and utilization of water resources and reducing the consumption of fresh water. Furthermore, the equipment should be characterized by low energy consumption, stable operation, and convenient maintenance to reduce operating costs, improve economic efficiency, and help enterprises achieve green production while complying with environmental regulations.

[0004] Therefore, we propose a desulfurization wastewater reduction and recovery device. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a desulfurization wastewater reduction and recovery device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A desulfurization wastewater reduction and recovery device includes a hydrocyclone separator, a ceramic membrane filter fixedly installed on one side of the hydrocyclone separator, a multi-stage falling film evaporator fixedly installed on one side of the ceramic membrane filter, the multi-stage falling film evaporator being composed of multiple evaporation chambers arranged vertically, a membrane distributor fixedly installed at the top of the inner wall of the evaporator chamber, a return gas pipe fixedly installed between the evaporation chambers, a condensation box fixedly installed on one side of the multi-stage falling film evaporator, and a recovery water tank fixedly installed at the bottom of the condensation box.

[0008] As a further embodiment of this utility model: a feed pipe is provided on the side of the bottom end of the cyclone separator, an underflow pipe is engaged at the bottom of the cyclone separator, and an overflow pipe is engaged at the top of the cyclone separator.

[0009] As a further improvement of this utility model: the overflow pipe is connected to the ceramic membrane filter pipeline, and the ceramic membrane filter is a cylindrical body.

[0010] As a further embodiment of this utility model: the inner wall of the ceramic membrane filter is fixedly provided with a plurality of hollow ceramic membrane tubes, and the two sides of the ceramic membrane filter are fixedly provided with coils, the coils engaging with the ceramic membrane tubes, and the overflow pipe being connected to the coils.

[0011] As a further embodiment of this utility model: a number of stainless steel heating tubes are fixedly installed on the inner wall of the evaporation chamber, the film distributor is located above the stainless steel heating tubes, and a number of liquid distribution holes are opened on the surface of the film distributor.

[0012] As a further improvement of this utility model: the evaporation chambers are parallel to each other and are fitted together by steam pipes.

[0013] As a further embodiment of this utility model: the return gas pipe is located on both sides of the evaporation chamber, the return gas pipe is lower than the vertical height of the film distributor, and the return gas pipe is connected to the lower evaporation chamber.

[0014] As a further improvement of this utility model: a plurality of condensing tubes are fixedly provided on the inner wall of the condensing box. The condensing tubes are elliptical in side view and are connected to the external cooling water system pipeline.

[0015] As a further improvement of this utility model: a water outlet is provided at the bottom of the inner wall of the condenser, and a return pipe is engaged at the bottom of the water outlet.

[0016] As a further improvement of this utility model: the bottom end of the return pipe is connected to the recycling water tank, and the recycling water tank is connected to the external water intake pump pipeline.

[0017] Compared with the prior art, this utility model provides a desulfurization wastewater reduction and recovery device, which has the following beneficial effects:

[0018] 1. This utility model utilizes a hydrocyclone separator to initially separate solid particles through centrifugal force, and a ceramic membrane filter to further trap tiny particles and colloids using a microporous structure, significantly reducing wastewater turbidity. A multi-stage falling film evaporator, through the principle of multi-effect evaporation, progressively concentrates wastewater, with salts collected in concentrated brine and discharged. The secondary steam generated during evaporation is recycled, and the condensed freshwater is recovered through a recycling tank, achieving highly efficient water reuse and significantly improving wastewater treatment efficiency and resource recovery rate.

[0019] 2. This utility model utilizes a multi-stage falling film evaporator with multiple vertically combined evaporation chambers connected to a steam pipeline via return pipes, enabling multiple uses of secondary steam and significantly reducing steam consumption compared to traditional single-effect evaporation. Simultaneously, the high-temperature resistance and corrosion resistance of the ceramic membrane filter reduces equipment replacement frequency, extends the overall lifespan of the device, and lowers maintenance costs. The elliptical condenser tubes in the condensation chamber increase the condensation area, improve steam condensation efficiency, further reduce energy consumption, and effectively lower the operating costs of the device.

[0020] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a desulfurization wastewater reduction and recovery device proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the coil and ceramic membrane tube of the desulfurization wastewater reduction and recovery device proposed in this utility model;

[0023] Figure 3 This is a cross-sectional three-dimensional structural diagram of the evaporation chamber of a desulfurization wastewater reduction and recovery device proposed in this utility model;

[0024] Figure 4 This is a cross-sectional three-dimensional structural diagram of the condenser box of a desulfurization wastewater reduction and recovery device proposed in this utility model.

[0025] Figure 5 This is a three-dimensional structural diagram of the evaporation chamber and reflux pipe of a desulfurization wastewater reduction and recovery device proposed in this utility model.

[0026] In the diagram: 1. Cyclone separator; 2. Ceramic membrane filter; 3. Multi-stage falling film evaporator; 4. Evaporation chamber; 5. Membrane distributor; 6. Return gas pipe; 7. Condenser; 8. Recycle water tank; 9. Feed pipe; 10. Underflow pipe; 11. Overflow pipe; 12. Ceramic membrane tube; 13. Coil; 14. Stainless steel heating tube; 15. Steam pipe; 16. Condenser; 17. Water outlet; 18. Return pipe; 19. Liquid distribution hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Example: A desulfurization wastewater reduction and recovery device, such as Figures 1-5 As shown, the system includes a hydrocyclone separator 1, a ceramic membrane filter 2 fixedly installed on one side of the hydrocyclone separator 1, a multi-stage falling film evaporator 3 fixedly installed on one side of the ceramic membrane filter 2, the multi-stage falling film evaporator 3 being composed of multiple evaporation chambers 4 arranged vertically, a membrane distributor 5 fixedly installed at the top of the inner wall of the evaporation chamber 4, a return gas pipe 6 fixedly installed between the evaporation chambers 4, a condensation box 7 fixedly installed on one side of the multi-stage falling film evaporator 3, a recovery water tank 8 fixedly installed at the bottom of the condensation box 7, a feed pipe 9 opened on the side of the bottom of the hydrocyclone separator, an underflow pipe 10 engaged at the bottom of the hydrocyclone separator 1, and an overflow pipe 11 engaged at the top of the hydrocyclone separator 1, the overflow pipe 11 being connected to the ceramic membrane filter 2. The ceramic membrane filter 2 is a cylindrical body. The hydrocyclone separator 1 initially separates solid particles through centrifugal force, and the ceramic membrane filter 2 further traps small particles and colloids using a microporous structure, significantly reducing the turbidity of the wastewater. The multi-stage falling film evaporator 3 uses the principle of multi-effect evaporation to concentrate wastewater step by step. The salt is enriched in the concentrated brine and discharged, while the secondary steam generated by evaporation is recycled. The fresh water formed by condensation is recovered through the recovery water tank 8, realizing the efficient reuse of water resources and significantly improving the efficiency of wastewater treatment and resource recovery rate.

[0030] like Figures 1-4 As shown, the inner wall of the ceramic membrane filter 2 is fixedly equipped with several hollow ceramic membrane tubes 12, and coils 13 are fixedly installed on both sides of the ceramic membrane filter 2. The coils 13 are engaged with the ceramic membrane tubes 12, and the overflow pipe 11 is connected to the coils 13. The inner wall of the evaporation chamber 4 is fixedly equipped with several stainless steel heating tubes 14, and the membrane distributor 5 is located above the stainless steel heating tubes 14. Several liquid distribution holes are opened on the surface of the membrane distributor 5. The evaporation chambers 4 are parallel to each other and are engaged with each other by steam pipes 15. The return gas pipes 6 are located on both sides of the evaporation chambers 4, and the height of the return gas pipes 6 is lower than the vertical height of the membrane distributor 5. The return gas pipes 6 are connected to the lower evaporation chamber 4. The multi-stage falling film evaporator 3 adopts multiple vertically combined evaporation chambers 4. The evaporation chambers 4 are connected to the steam pipes 15 through the return gas pipes 6 to realize the multiple use of secondary steam, which greatly reduces steam consumption compared with traditional single-effect evaporation. At the same time, the high temperature resistance and corrosion resistance of the ceramic membrane filter 2 reduces the frequency of equipment replacement, extends the service life of the overall device, and reduces maintenance costs.

[0031] like Figures 1-5 As shown, a number of condenser tubes 16 are fixedly installed on the inner wall of the condenser box 7. The condenser tubes 16 are elliptical in side view and are connected to the external cold water system pipeline. A water outlet 17 is opened at the bottom of the inner wall of the condenser box 7. A return pipe 18 is engaged at the bottom of the water outlet 17. The bottom of the return pipe 18 is engaged and connected to the recovery water tank 8. The recovery water tank 8 is connected to the external water intake pump pipeline.

[0032] Working Principle: Desulfurization wastewater enters the hydrocyclone separator 1 through the feed pipe 9. Under centrifugal force, solid particles are separated to the bottom and discharged through the underflow pipe 10. The clear liquid after preliminary separation flows into the ceramic membrane filter 2 through the overflow pipe 11. In the ceramic membrane filter 2, the clear liquid enters the outer side of the hollow ceramic membrane tube 12 through the coil 13. After filtration by the ceramic membrane, small particles and colloids are intercepted. The filtered wastewater enters the multi-stage falling film evaporator 3. In the multi-stage falling film evaporator 3, the membrane distributor 5 evenly distributes the wastewater on the surface of the stainless steel heating tube 14 to form a liquid film. The heat source in the heating tube causes the water to evaporate, and the concentrated liquid flows downwards step by step, finally discharging the concentrated brine. The secondary steam generated by evaporation enters the lower evaporation chamber 4 through the return pipe 6 as a heat source for recycling. The steam generated in the last effect enters the condenser 7. The elliptical condenser tube 16 connected to the cold water mechanism condenses the steam into liquid water, which flows into the recovery water tank 8 through the outlet 17 and the return pipe 18. The water is then pumped back to the production process for reuse.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A desulfurization wastewater reduction and recovery device, comprising a hydrocyclone separator (1), characterized in that: A ceramic membrane filter (2) is fixedly installed on one side of the cyclone separator (1). A multi-stage falling film evaporator (3) is fixedly installed on one side of the ceramic membrane filter (2). The multi-stage falling film evaporator (3) is composed of multiple evaporation chambers (4) arranged vertically. A film distributor (5) is fixedly installed at the top of the inner wall of the evaporation chamber (4). A return gas pipe (6) is fixedly installed between the evaporation chambers (4). A condenser box (7) is fixedly installed on one side of the multi-stage falling film evaporator (3). A recovery water tank (8) is fixedly installed at the bottom of the condenser box (7).

2. The desulfurization wastewater reduction and recovery device according to claim 1, characterized in that: The hydrocyclone separator (1) has a feed pipe (9) on the side of its bottom end, an underflow pipe (10) is fitted at the bottom of the hydrocyclone separator (1), and an overflow pipe (11) is fitted at the top of the hydrocyclone separator (1).

3. The desulfurization wastewater reduction and recovery device according to claim 2, characterized in that: The overflow pipe (11) is connected to the ceramic membrane filter (2), which is a cylindrical body.

4. The desulfurization wastewater reduction and recovery device according to claim 3, characterized in that: The inner wall of the ceramic membrane filter (2) is fixedly provided with a number of hollow ceramic membrane tubes (12), and the two sides of the ceramic membrane filter (2) are fixedly provided with coils (13). The coils (13) are engaged with the ceramic membrane tubes (12), and the overflow pipe (11) is connected to the coils (13).

5. The desulfurization wastewater reduction and recovery device according to claim 4, characterized in that: The inner wall of the evaporation chamber (4) is fixedly provided with several stainless steel heating tubes (14), and the film distributor (5) is located above the stainless steel heating tubes (14). Several liquid distribution holes (19) are opened on the surface of the film distributor (5).

6. The desulfurization wastewater reduction and recovery device according to claim 5, characterized in that: The evaporation chambers (4) are parallel to each other and are fitted with steam pipes (15).

7. The desulfurization wastewater reduction and recovery device according to claim 1, characterized in that: The return gas pipe (6) is located on both sides of the evaporation chamber (4). The return gas pipe (6) is lower than the vertical height of the film distributor (5). The return gas pipe (6) is connected to the lower evaporation chamber (4).

8. The desulfurization wastewater reduction and recovery device according to claim 1, characterized in that: The inner wall of the condenser (7) is fixedly provided with several condenser tubes (16), which are elliptical in side view and connected to the external cooling water system pipeline.

9. The desulfurization wastewater reduction and recovery device according to claim 1, characterized in that: The condenser (7) has a water outlet (17) at the bottom of its inner wall, and a return pipe (18) is engaged at the bottom of the water outlet (17).

10. The desulfurization wastewater reduction and recovery device according to claim 9, characterized in that: The bottom end of the return pipe (18) is connected to the recycling water tank (8), and the recycling water tank (8) is connected to the external water intake pump pipeline.

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