Water island type water treatment system for coal-fired power plant

Abstract

The utility model discloses a water island type water treatment system for a coal-fired power plant. The water island type water treatment system is structurally characterized in that a water source water treatment module is provided with a first water outlet and a first sludge outlet; the cooling tower is provided with a second water outlet, and the first water outlet is connected with the cooling tower; the circulating water treatment module is provided with a produced water outlet, a wastewater discharge port, a concentrated water discharge port and a second sludge discharge port, and the second water discharge port is connected with the circulating water treatment module; the desulfurization module is provided with a third water outlet, and the concentrated water outlet is connected with the desulfurization module; the industrial wastewater treatment module is provided with a third sludge discharge port, and the wastewater discharge port is connected with the industrial wastewater treatment module; the desulfurization wastewater treatment module is provided with a fourth sludge discharge port, and the third water discharge port is connected with the desulfurization wastewater treatment module; the first sludge discharge port, the second sludge discharge port, the third sludge discharge port and the fourth sludge discharge port are all connected with the sludge treatment module. The water island type water treatment system for the coal-fired power plant can efficiently and stably supply production water.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology for coal-fired power plants, and in particular relates to a water island-type water treatment system for coal-fired power plants. Background Technology

[0002] Thermal power plants consume a large amount of water, primarily for cooling, ash removal, and desulfurization processes. As the scale and power generation of thermal power plants increase, water consumption also increases accordingly. Currently, thermal power plants have high water quality requirements, necessitating treatment before use to prevent damage to equipment and the environment. Water island-style water treatment systems achieve efficient water resource utilization and wastewater recycling through integrated water treatment solutions. These systems typically integrate and manage multiple aspects of the power plant, including source water purification, process water treatment, wastewater treatment and reuse, and zero discharge of final wastewater, to achieve the goals of saving construction investment and reducing operating costs. Although island-type water treatment systems have achieved significant results in wastewater recycling, they still have shortcomings in source water treatment. Current island-type systems mainly focus on how to recycle and reuse wastewater, lacking treatment of source water. The sources and quality of source water vary, making it difficult to directly meet the needs of stable power plant operation. In addition, island-type treatment systems involve multiple water treatment units and process links, requiring high coordination and matching between units. If the treatment units are not properly matched, it will affect the operation of the entire system, making it impossible to achieve the goal of zero discharge of terminal wastewater. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a coal-fired power plant water island water treatment system with simple structure, high water treatment efficiency, and uniform properties of treated water.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A water island-type water treatment system for a coal-fired power plant, comprising:

[0005] The water source treatment module has a first drainage outlet and a first sludge discharge outlet;

[0006] A cooling tower having a second drain outlet, wherein the first drain outlet is connected to the cooling tower;

[0007] The circulating water treatment module has a product water outlet, a wastewater outlet, a concentrated water outlet, and a second sludge outlet, with the second outlet connected to the circulating water treatment module.

[0008] The desulfurization module has a third drain outlet, and the concentrated water outlet is connected to the desulfurization module.

[0009] An industrial wastewater treatment module has a third sludge discharge port, and the wastewater discharge port is connected to the industrial wastewater treatment module.

[0010] The desulfurization wastewater treatment module has a fourth sludge discharge outlet, and the third discharge outlet is connected to the desulfurization wastewater treatment module; and

[0011] The sludge treatment module is connected to the first sludge discharge port, the second sludge discharge port, the third sludge discharge port, and the fourth sludge discharge port.

[0012] The beneficial effects of the above technical solution are as follows: the water source treatment module can be used to perform preliminary purification treatment on the water source, and then the cooling tower can be used to cool down the water purified by the water source treatment module. The cooled water is then further purified by the circulating water treatment module to obtain product water. The circulating water treatment module will also generate concentrated water, wastewater and sludge during operation. At this time, the concentrated water is desulfurized by the desulfurization module, while the wastewater is treated harmlessly by the industrial wastewater treatment module. At the same time, the wastewater treated by the desulfurization module is treated harmlessly by the desulfurization wastewater treatment module. The sludge generated by the water source treatment module, circulating water treatment module, industrial wastewater treatment module and desulfurization wastewater treatment module is treated harmlessly by the sludge treatment module.

[0013] The water source treatment module described in the above technical solution includes a flocculation tank and a sedimentation tank. The flocculation tank is connected to the sedimentation tank, and the first drain outlet and the first sludge discharge outlet are both located on the sedimentation tank.

[0014] The beneficial effects of the above technical solution are as follows: when the source water enters the flocculation tank, the particulate components in the source water are agglomerated into clumps under the action of flocculant, and then precipitated in the sedimentation tank. The supernatant is sent to the cooling tower for cooling treatment, and the sediment in the sedimentation tank is discharged to the sludge treatment module for treatment.

[0015] The circulating water treatment module described in the above technical solution includes a high-density tank, a multi-media filtration tank, an ultrafiltration device, a reverse osmosis device, and an ion exchange device connected in sequence. The second drain outlet is connected to the high-density tank. The concentrated water outlet is located on the reverse osmosis device. The product water outlet and the wastewater outlet are both located on the ion exchange device. The second sludge discharge outlet is located on the high-density tank.

[0016] The beneficial effects of the above technical solution are as follows: the high-density tank is used to precipitate and purify the water sent from the cooling tower; the multi-media filter tank is used to filter and purify the water treated in the high-density tank; the ultrafiltration device is used to purify the water filtered by the multi-media filter tank; the reverse osmosis device is used to purify the water after ultrafiltration; the concentrated water produced is rich in salt and can be desulfurized by the desulfurization module; the purified water after the reverse osmosis device is deionized by the ion exchange device, and the resulting product water is deionized water; the wastewater produced after the ion exchange device is treated by the industrial wastewater treatment module.

[0017] The reverse osmosis devices described in the above technical solution are arranged in multiple series and / or parallel configurations.

[0018] The beneficial effect of the above technical solution is that it makes the desalination effect of water purification better.

[0019] The circulating water treatment module in the above technical solution also includes a concentrate collection tank, and the concentrate outlets of multiple reverse osmosis units are all connected to the concentrate collection tank, which is connected to the desulfurization module.

[0020] The beneficial effect of the above technical solution is that the concentrate produced by multiple reverse osmosis units is collected by the concentrate collection tank for centralized treatment by the desulfurization system.

[0021] The ion exchange device described in the above technical solution includes a cation exchange device, an anion exchange device, and an anion-cation mixed bed device connected in series. The product water outlet is located on the anion-cation mixed bed device, and the cation exchange device, anion exchange device, and anion-cation mixed bed device all have wastewater discharge outlets.

[0022] The beneficial effect of the above technical solution is that it makes the ion exchange device more effective in deionizing water.

[0023] The desulfurization wastewater treatment module described in the above technical solution includes a desulfurization triple tank, a pre-sedimentation tank, a triple-effect evaporator, a drying device, and an ash and slag receiving device connected in sequence. The third drainage outlet is connected to the desulfurization triple tank, and the fourth sludge discharge outlet is located on the pre-sedimentation tank.

[0024] The beneficial effects of the above technical solution are as follows: the wastewater generated by the desulfurization module can be neutralized, reacted and flocculated by the desulfurization triple box, then settled by the pre-sedimentation tank, concentrated by the triple-effect evaporator, further dried by the drying device, and finally received by the ash and slag receiving device for transfer to harmless treatment.

[0025] The industrial wastewater treatment module described in the above technical solution is an integrated magnetic coagulation device.

[0026] The beneficial effects of the above technical solution are as follows: flocculants and magnetic powder can be added to the wastewater, which allows the flocs in the wastewater to further agglomerate under the action of the magnetic powder, thus enabling more thorough treatment of the sludge in the wastewater.

[0027] The sludge treatment module described in the above technical solution includes a sludge mixing tank and a dewatering machine. The sludge mixing tank is connected to the dewatering machine, and the first sludge discharge port, the second sludge discharge port, the third sludge discharge port and the fourth sludge discharge port are all connected to the sludge mixing tank.

[0028] The beneficial effect of the above technical solution is that the sludge is first fully mixed in the sludge mixing tank, and then dewatered by the dewatering machine according to the predetermined process.

[0029] The sludge treatment module described in the above technical solution also includes a sludge thickening tank, and the sludge mixing tank is connected to the dewatering machine through the sludge thickening tank.

[0030] The beneficial effects of the above technical solution are as follows: before the mixed sludge is dewatered by the dewatering machine, the mixed sludge is first concentrated in the sludge thickening tank. This ensures that the sludge entering the dewatering machine has a consistent moisture content, which helps to keep the dewatering machine's operation process stable. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the modules of the water island-type water treatment system for a coal-fired power plant as described in this embodiment of the utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the water island-type water treatment system for a coal-fired power plant as described in an embodiment of this utility model;

[0033] Figure 3 This is a schematic diagram showing the connection of multiple reverse osmosis devices and multiple ion exchange devices in an embodiment of this utility model;

[0034] Figure 4 This is a schematic diagram of the sludge treatment module described in an embodiment of the present invention.

[0035] In the diagram: 1. Source water treatment module; 11. Flocculation tank; 12. Sedimentation tank; 2. Cooling tower; 3. Circulating water treatment module; 31. High-density tank; 32. Multi-media filtration tank; 33. Ultrafiltration device; 34. Reverse osmosis device; 35. Ion exchange device; 35a. Cation exchange device; 35b. Anion exchange device; 35c. Mixed bed device for anions and cations; 36. Concentrate collection tank; 4. Desulfurization module; 5. Industrial wastewater treatment module; 6. Desulfurization wastewater treatment module; 61. Desulfurization triple tank; 62. Pre-sedimentation tank; 63. Triple-effect evaporator; 64. Drying device; 65. Ash and slag receiving device; 7. Sludge treatment module; 71. Sludge mixing tank; 72. Sludge thickening tank; 73. Dewatering machine. Detailed Implementation

[0036] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0037] like Figure 1 As shown, this embodiment provides a water island-type water treatment system for a coal-fired power plant, including:

[0038] Water source treatment module 1 has a first drain outlet and a first sludge discharge outlet;

[0039] Cooling tower 2 has a second drain outlet, and the first drain outlet is connected to the cooling tower 2;

[0040] The circulating water treatment module 3 has a product water outlet, a wastewater outlet, a concentrated water outlet, and a second sludge outlet, with the second outlet connected to the circulating water treatment module 3.

[0041] The desulfurization module 4 has a third drain outlet, and the concentrated water outlet is connected to the desulfurization module 4.

[0042] The industrial wastewater treatment module 5 has a third sludge discharge port, and the wastewater discharge port is connected to the industrial wastewater treatment module 5.

[0043] The desulfurization wastewater treatment module 6 has a fourth sludge discharge outlet, and the third discharge outlet is connected to the desulfurization wastewater treatment module 6; and

[0044] The sludge treatment module 7 is connected to the first, second, third, and fourth sludge discharge ports. This allows the source water to undergo preliminary purification by the source water treatment module. The purified water is then cooled by a cooling tower, and further purified by the circulating water treatment module to produce product water. During operation, the circulating water treatment module also generates concentrated water, wastewater, and sludge. The concentrated water is desulfurized by the desulfurization module, while the wastewater is treated harmlessly by the industrial wastewater treatment module. The wastewater treated by the desulfurization module is then treated harmlessly by the desulfurization wastewater treatment module. The sludge generated by the source water treatment module, circulating water treatment module, industrial wastewater treatment module, and desulfurization wastewater treatment module is then treated harmlessly by the sludge treatment module.

[0045] in, Figure 1 and Figure 3 The letters a and j next to the middle arrows represent the following: "a" is the first drainage outlet, "b" is the first sludge discharge outlet, "c" is the second drainage outlet, "d" is the fourth sludge discharge outlet, "e" is the concentrated water discharge outlet, "f" is the product water outlet, "g" is the wastewater discharge outlet, "h" is the second sludge discharge outlet, "i" is the third drainage outlet, and "j" is the third sludge discharge outlet. Figure 1 and Figure 3 In this text, "A" represents source water, and "B" represents produced water. Figure 1 and Figure 2 Solid arrows indicate water delivery paths, while dashed arrows indicate sludge discharge paths.

[0046] like Figure 2 As shown, the water source treatment module 1 in the above technical solution includes a flocculation tank 11 and a sedimentation tank 12. The flocculation tank 11 is connected to the sedimentation tank 12, and the first drain outlet and the first sludge discharge outlet are both located on the sedimentation tank 12. In this way, when the water source enters the flocculation tank, the particulate components in the water are agglomerated into clumps under the action of flocculant, and then precipitate in the sedimentation tank. The supernatant is sent to the cooling tower for cooling treatment, and the sediment in the sedimentation tank is discharged to the sludge treatment module for treatment.

[0047] like Figure 2As shown, the circulating water treatment module 3 in the above technical solution includes a high-density tank 31, a multi-media filter tank 32, an ultrafiltration device 33, a reverse osmosis device 34, and an ion exchange device 35 connected in sequence. The second drain outlet is connected to the high-density tank 31. The concentrated water outlet is located on the reverse osmosis device 34. The product water outlet and wastewater outlet are both located on the ion exchange device 35. The second sludge discharge outlet is located on the high-density tank 31. The high-density tank is used to precipitate and purify the water sent from the cooling tower. The multi-media filter tank filters and purifies the water treated in the high-density tank. The ultrafiltration device purifies the water filtered by the multi-media filter tank. The reverse osmosis device purifies the water after ultrafiltration. The concentrated water produced is rich in salt and can be desulfurized by the desulfurization module. The purified water after the reverse osmosis device is deionized by the ion exchange device, resulting in deionized water. The wastewater produced after the ion exchange device is treated by the industrial wastewater treatment module.

[0048] The high-density tank 31, multi-media filtration tank 32, ultrafiltration device 33, reverse osmosis device 34, and ion exchange device 35 are all existing technologies and will not be described in detail here.

[0049] like Figure 3 As shown, the reverse osmosis device 34 described in the above technical solution is arranged in multiple ways in series and / or parallel (it can be in series, parallel, or a combination of series and parallel); this makes the desalination effect of the purified water better.

[0050] The circulating water treatment module 3 in the above technical solution also includes a concentrate collection tank 36. The concentrate outlets of multiple reverse osmosis devices 34 are all connected to the concentrate collection tank 36, which is connected to the desulfurization module 4. This allows the concentrate produced by multiple reverse osmosis devices to be collected by the concentrate collection tank for centralized treatment by the desulfurization system.

[0051] The desulfurization module described in this embodiment can be a membrane concentration device (which can further concentrate the concentrate), a bioreactor, or a Fenton tank, depending on the process requirements.

[0052] like Figure 3 As shown, the ion exchange device 35 in the above technical solution includes a cation exchange device 35a, an anion exchange device 35b, and a mixed bed device 35c connected in series. The product water outlet is located on the mixed bed device 35c. The cation exchange device 35a, anion exchange device 35b, and mixed bed device 35c all have wastewater discharge outlets. This makes the deionization effect of the ion exchange device on the purified water more complete.

[0053] like Figure 2 As shown, the desulfurization wastewater treatment module 6 in the above technical solution includes a desulfurization triple tank 61, a pre-sedimentation tank 62, a triple-effect evaporator 63, a drying device 64, and an ash and slag receiving device 65 connected in sequence. The third drainage outlet is connected to the desulfurization triple tank 61, and the fourth sludge discharge outlet is located on the pre-sedimentation tank 62. In this way, the wastewater generated by the desulfurization module can be neutralized, reacted, and flocculated by the desulfurization triple tank, then settled by the pre-sedimentation tank, then concentrated by the triple-effect evaporator, and further dried by the drying device. Finally, the ash and slag receiving device receives the dried slag for transfer to a harmless treatment facility.

[0054] The heat source for the triple-effect evaporator 63 can be the recovered heat from the flue gas of the power plant.

[0055] The desulfurization triple box 61, pre-sedimentation tank 62 and triple-effect evaporator 63 are all existing technologies and will not be described in detail here. The drying device 64 can be an existing drum dryer, flash dryer or rotary spray dryer. The ash receiving device 65 can be a tipping cart, which can transfer ash with high salt content to bags for storage as a de-icing agent.

[0056] The industrial wastewater treatment module 5 described in the above technical solution is an integrated magnetic coagulation device (which is existing equipment and will not be described in detail here); thus, flocculants and magnetic powder can be added to the wastewater, so that the flocs in the wastewater can be further aggregated under the action of the magnetic powder, thereby enabling more thorough treatment of the sludge in the wastewater. The wastewater treated by the industrial wastewater treatment module can be sent to the sewage treatment plant in the factory area for further purification treatment to meet the discharge standards.

[0057] like Figure 2 and Figure 4 As shown, the sludge treatment module 7 in the above technical solution includes a sludge mixing tank 71 and a dewatering machine 73. The sludge mixing tank 71 is connected to the dewatering machine 73, and the first sludge discharge port, the second sludge discharge port, the third sludge discharge port and the fourth sludge discharge port are all connected to the sludge mixing tank 71. This allows the sludge to be fully mixed in the sludge mixing tank first, and then dewatered by the dewatering machine according to a predetermined process.

[0058] like Figure 2 and Figure 4As shown, the sludge treatment module 7 in the above technical solution also includes a sludge thickening tank 72. The sludge mixing tank 71 is connected to the dewatering machine 73 through the sludge thickening tank 72 (which is prior art and will not be described in detail here). This allows the mixed sludge to be thickened by the sludge thickening tank before being dewatered by the dewatering machine. This ensures that the sludge entering the dewatering machine has a consistent moisture content, which is beneficial to maintaining the stability of the dewatering machine's operation. In this embodiment, the dewatering machine can be a plate and frame dewatering machine.

[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A water island-type water treatment system for a coal-fired power plant, characterized in that, include: The water source treatment module (1) has a first drain outlet and a first sludge discharge outlet; The cooling tower (2) has a second drain outlet, and the first drain outlet is connected to the cooling tower (2); The circulating water treatment module (3) has a product water outlet, a wastewater outlet, a concentrated water outlet, and a second sludge outlet, and the second outlet is connected to the circulating water treatment module (3). The desulfurization module (4) has a third drain outlet, and the concentrated water outlet is connected to the desulfurization module (4); The industrial wastewater treatment module (5) has a third sludge discharge port, and the wastewater discharge port is connected to the industrial wastewater treatment module (5); The desulfurization wastewater treatment module (6) has a fourth sludge discharge outlet, and the third discharge outlet is connected to the desulfurization wastewater treatment module (6); and The sludge treatment module (7) is connected to the first sludge discharge port, the second sludge discharge port, the third sludge discharge port and the fourth sludge discharge port.

2. The water island-type water treatment system for coal-fired power plants according to claim 1, characterized in that, The water source treatment module (1) includes a flocculation tank (11) and a sedimentation tank (12). The flocculation tank (11) is connected to the sedimentation tank (12). The first drain outlet and the first sludge discharge outlet are both located on the sedimentation tank (12).

3. The water island-type water treatment system for coal-fired power plants according to claim 1, characterized in that, The circulating water treatment module (3) includes a high-density tank (31), a multi-media filter tank (32), an ultrafiltration device (33), a reverse osmosis device (34), and an ion exchange device (35) connected in sequence. The second drain outlet is connected to the high-density tank (31). The concentrated water outlet is located on the reverse osmosis device (34). The product water outlet and the wastewater outlet are both located on the ion exchange device (35). The second sludge discharge outlet is located on the high-density tank (31).

4. The water island-type water treatment system for coal-fired power plants according to claim 3, characterized in that, Multiple reverse osmosis units (34) are arranged in series and / or in parallel.

5. The water island-type water treatment system for coal-fired power plants according to claim 4, characterized in that, The circulating water treatment module (3) also includes a concentrate collection tank (36), and the concentrate outlets of multiple reverse osmosis devices (34) are all connected to the concentrate collection tank (36), which is connected to the desulfurization module (4).

6. The water island-type water treatment system for coal-fired power plants according to claim 3, characterized in that, The ion exchange device (35) includes a cation exchange device (35a), an anion exchange device (35b), and an anion-cation mixed bed device (35c) connected in series. The product water outlet is located on the anion-cation mixed bed device (35c). The cation exchange device (35a), anion exchange device (35b), and anion-cation mixed bed device (35c) all have wastewater discharge outlets.

7. The water island-type water treatment system for coal-fired power plants according to claim 1, characterized in that, The desulfurization wastewater treatment module (6) includes a desulfurization triple box (61), a pre-sedimentation tank (62), a triple-effect evaporator (63), a drying device (64), and an ash and slag receiving device (65) connected in sequence. The third drain outlet is connected to the desulfurization triple box (61), and the fourth sludge discharge outlet is located on the pre-sedimentation tank (62).

8. The water island-type water treatment system for coal-fired power plants according to claim 1, characterized in that, The industrial wastewater treatment module (5) is an integrated magnetic coagulation device.

9. The water island-type water treatment system for coal-fired power plants according to claim 1, characterized in that, The sludge treatment module (7) includes a sludge mixing tank (71) and a dewatering machine (73). The sludge mixing tank (71) is connected to the dewatering machine (73), and the first sludge discharge port, the second sludge discharge port, the third sludge discharge port and the fourth sludge discharge port are all connected to the sludge mixing tank (71).

10. The water island-type water treatment system for coal-fired power plants according to claim 9, characterized in that, The sludge treatment module (7) also includes a sludge thickening tank (72), and the sludge mixing tank (71) is connected to the dewatering machine (73) through the sludge thickening tank (72).

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