Recycling system for recycled waste water of air cooling island

Abstract

The utility model discloses an air cooling island recycled wastewater recycling system, and relates to the technical field of waste incineration treatment plant wastewater recycling, the air cooling island recycled wastewater recycling system comprises a clear water tank and a lime slurry preparation tank, and the water inlet end of the clear water tank is used for communicating with the output end of a recycling pump; the lime slurry preparation tank is used for preparing lime slurry after clear water is added, the water inlet end of the lime slurry preparation tank is communicated with a production water pipeline, and the production water pipeline is used for conveying production water to the lime slurry preparation tank; the water outlet end of the clear water tank is communicated with a first output pipeline and a second output pipeline which are independent, the output end of the first output pipeline is used for being communicated with a flue gas cooling water tank, and the output end of the second output pipeline is communicated with a production water pipeline. The method has the effect of improving the utilization rate of the air cooling island recycled wastewater.

Description

Technical Field

[0001] This application relates to the technical field of wastewater recycling in waste incineration treatment plants, and particularly relates to a system for recycling and reusing wastewater from an air-cooled island. Background Art

[0002] Energy conservation and consumption reduction have always been important tasks for waste incineration treatment plants to ensure economic operation. The wastewater recycled after being used by the air-cooled island in our company has always been used as the flue gas cooling water in the reaction tower. Due to the uneven usage, most of the recycled wastewater overflows into the drainage ditch. The main recycling process is to use the recycling pump installed in the wastewater tank of the air-cooled island to transport the recycled wastewater to the clean water tank placed in the urea room. When the water level in the flue gas cooling water tank drops to the position where water replenishment is required, the clean water pump installed beside the clean water tank is started to transport the recycled water in the clean water tank to the flue gas cooling water tank, thus achieving recycling and utilization.

[0003] Currently, the wastewater from the air-cooled island is recycled and used as flue gas cooling water. Since the flue gas cooling water needs to be used according to the boiler combustion conditions, there are irregular usage and unstable usage amounts, resulting in the insufficient use of the recycled wastewater and thus reducing the economic efficiency of production operation. Summary of the Utility Model

[0004] In order to improve the situation where the wastewater from the air-cooled island is not fully utilized after recycling, this application provides a system for recycling and reusing wastewater from an air-cooled island.

[0005] This application provides a system for recycling and reusing wastewater from an air-cooled island, adopting the following technical solutions:

[0006] A wastewater reuse system for an air-cooled island includes

[0007] A clean water tank, the water inlet end of which is used to communicate with the output end of the recycling pump;

[0008] A lime slurry preparation tank for preparing lime slurry after adding clean water. The water inlet end of the lime slurry preparation tank is connected with a production water pipeline, and the production water pipeline is used to transport production water to the lime slurry preparation tank;

[0009] The water outlet end of the clean water tank is respectively connected with an independent first output pipeline and a second output pipeline. The output end of the first output pipeline is used to communicate with the flue gas cooling water tank, and the output end of the second output pipeline is connected with the production water pipeline.

[0010] By adopting the above technical solution, when the waste water of the air-cooled island is recycled until the fresh water tank is full, the excess recycled water is transported into the lime slurry preparation tank through the second output pipeline. When slurry preparation is required, there is no need to inject production water into the tank anymore, thereby reducing the consumption of production water. When the recycled waste water cannot meet the water demand for lime slurry preparation, only production water can be used for slurry preparation. Such a design can fully utilize the recycled water of the air-cooled island while ensuring the water supply to the flue gas cooling water tank, and the dual pipeline provides water for the lime slurry preparation tank, which can also ensure the safety and reliability of slurry preparation.

[0011] Optionally, a first valve is provided on the side of the production water pipeline close to the input end, and a second valve is provided on the side of the second output pipeline close to the output end.

[0012] By adopting the above technical solution, when the recycled water in the fresh water tank is insufficient, the second valve can be closed and the first valve can be opened simultaneously to use only production water for slurry preparation. When the fresh water tank is full of recycled water, the first valve can be closed and the second valve can be opened simultaneously, so as to simply use the excess recycled water for slurry preparation, enabling the free switching of production water or recycled water as the supply of slurry preparation water.

[0013] Optionally, a first booster pump is provided on the side of the first output pipeline close to the input end, and a second booster pump is provided on the side of the second output pipeline close to the input end.

[0014] By adopting the above technical solution, the first booster pump can boost the water in the first output pipeline and smoothly transport the fresh water into the flue gas cooling water tank, while the second booster pump can boost the water in the second output pipeline, thereby smoothly transporting the fresh water into the lime slurry preparation.

[0015] Optionally, the output end of the second output pipeline is connected to a recirculation pipeline, the recirculation pipeline is independent of the production water pipeline, and the output end of the recirculation pipeline is connected to the fresh water tank.

[0016] By adopting the above technical solution, the output end of the second output pipeline is connected to a recirculation pipeline. If the flow rate of the recycled water required by the lime slurry preparation tank is lower than the rated flow rate of the second booster pump, the excess recycled water can flow back into the fresh water tank through the recirculation pipeline for storage, so that the water pressure and flow rate in the second output pipeline can be adjusted by using the recirculation pipeline.

[0017] Optionally, a third valve is provided at the input end of the recirculation pipeline, and a pressure sensor is provided at the output end of the second output pipeline of the second booster pump.

[0018] By adopting the above technical solution, the pressure sensor can monitor the pressure in the second output pipeline in real time. When the pressure in the second output pipeline increases, the third valve opens, and the excess recycled water flows into the recirculation pipeline, thereby achieving the purpose of automatically adjusting the pipeline pressure and flow rate.

[0019] Optionally, a fourth valve is provided on the side of the first output pipeline close to the input end, and a fifth valve is provided on the side of the second output pipeline close to the input end.

[0020] By adopting the above technical solution, a fourth valve is provided on the side of the first output pipeline close to the input end, and at the same time a fifth valve is provided on the side of the second output pipeline close to the input end. The fourth valve and the fifth valve can be opened and closed separately to achieve the purpose of conducting or cutting off the first output pipeline and the second output pipeline.

[0021] Optionally, the fresh water tank includes a first water storage tank and a second water storage tank. The first water storage tank is used to communicate with the output end of the recycling pump, and the water outlet end of the first water storage tank is communicated with the input end of the first output pipeline. The first water storage tank is communicated with the second water storage tank through a transfer pipeline. The water outlet end of the second water storage tank is communicated with the input end of the second output pipeline. A minimum holding water level is provided in the first water storage tank, and a water level sensor is provided at the position corresponding to the minimum holding water level in the first water storage tank.

[0022] By adopting the above technical solution, the first water storage tank is used to store the recycled water from the recycling pump. When the recycled water in the first water storage tank is full, the excess recycled water enters the second water storage tank for storage. The water in the first water storage tank is exclusively for the flue gas cooling water tank, and the water in the second water storage tank is exclusively for the lime slurry preparation tank. Since the demand for flue gas cooling water is irregular, in order to ensure that the first water storage tank always has the recycled water for the flue gas cooling water tank, when the water level sensor monitors that the water level in the first water storage tank drops to the minimum holding water level, the first water storage tank stops supplying water to the second water storage tank, thereby ensuring that the recycled water in the first water storage tank is always above the minimum holding water level.

[0023] Optionally, a third booster pump and a check valve are provided on the transfer pipeline. The third booster pump is used to transport the recycled water from the first water storage tank to the second water storage tank.

[0024] By adopting the above technical solution, when the water level in the first water storage tank reaches above the minimum holding water level, the recycled water can be transported to the second water storage tank through the third booster pump. The check valve provided on the transfer pipeline prevents the water entering the second water storage tank from flowing back to the first water storage tank, making the first water storage tank and the second water storage tank two independent water storage systems.

[0025] In summary, the present application includes at least one of the following beneficial effects:

[0026] 1. By connecting a second output pipeline leading to the lime slurry preparation tank to the water storage pipeline of the clean water tank, the excess recycled water in the clean water tank can be directly transported to the lime slurry preparation tank through the second output pipeline, so that the excess recycled water can be used for slurry preparation, achieving the full utilization of the recycled water;

[0027] 2. By adding a recirculation pipeline to the second output pipeline, when the water demand of the lime slurry preparation tank decreases, the excess recycled water in the second output pipeline is returned to the clean water tank for storage through the recirculation pipeline, thereby achieving the purpose of stabilizing the outlet pressure of the second booster pump;

[0028] 3. By setting a first valve on the production water pipeline and a second valve on the second output pipeline, the pipeline for supplying water to the lime slurry preparation tank can be freely adjusted by opening or closing the first valve or the second valve. Using a dual - line to provide slurry - making water can ensure the safety and reliability of slurry preparation. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram showing the recycled wastewater reuse system in Embodiment 1 of the present application;

[0030] Figure 2 is a schematic structural diagram showing the transfer pipeline in Embodiment 2 of the present application.

[0031] Description of the Reference Numerals: 1, clean water tank; 11, first water storage tank; 12, second water storage tank; 2, flue gas cooling water tank; 3, lime slurry preparation tank; 31, production water pipeline; 311, first valve; 4, main output pipeline; 41, first output pipeline; 411, first booster pump; 412, fourth valve; 42, second output pipeline; 421, second valve; 422, second booster pump; 423, pressure sensor; 424, fifth valve; 5, recirculation pipeline; 51, third valve; 6, transfer pipeline; 61, third booster pump; 62, check valve. Detailed Description of the Embodiment

[0032] The following is a further detailed description of the present application in combination with the attached Figure 1-2 drawings.

[0033] Embodiment 1:

[0034] Embodiment 1 of the present application discloses an air - cooled island recycled wastewater reuse system. Refer to Figure 1, the air-cooled island waste water recycling and reuse system includes a fresh water tank 1, a flue gas cooling water tank 2, and a lime slurry preparation tank 3. The fresh water tank 1 is provided with a water inlet end and a water outlet end. The water inlet end of the fresh water tank 1 is connected to the output end of the recycling pump in the air-cooled island waste water tank. The waste water recycling pump transports the recycled water in the waste water tank to the fresh water tank 1 for storage. The water outlet end of the fresh water tank 1 is connected to a main output pipe. The output ends of the main output pipeline 4 are respectively connected to an independent first output pipeline 41 and a second output pipeline 42. The output end of the first output pipeline 41 is connected to the water inlet end of the flue gas cooling water tank 2 to provide water source for the flue gas cooling water tank 2. Both the first output pipeline 41 and the second output pipeline 42 can be assembled by PE pipes with a diameter of 50 mm.

[0035] The lime slurry preparation tank 3 can prepare lime slurry after adding fresh water. The water inlet end of the lime slurry preparation tank 3 is connected to a production water pipeline 31. The production water pipeline 31 can transport production water into the lime slurry preparation tank 3. In Embodiment 1 of the present application, there are two lime slurry preparation tanks 3. The production water pipeline 31 is divided into two to supply water to the two lime slurry preparation tanks 3 at the same time. The output end of the second output pipeline 42 is connected to the production water pipeline 31, so that the fresh water tank 1 can transport the excess recycled water to the lime slurry preparation tank 3 through the second output pipeline 42, thereby improving the utilization rate of the recycled water. An isolation valve is connected to the main output pipe. When it is not necessary to transport water to the flue gas cooling water tank 2 and the lime slurry preparation tank 3, the isolation valve can be closed to isolate the first output pipeline 41 and the second output pipeline 42 at the same time.

[0036] A first valve 311 is fixed on the production water pipeline 31 near the input end side. At the same time, a second valve 421 is fixed on the second output pipeline 42 near the output end side. Both the first valve 311 and the second valve 421 can be opened and closed independently. When the air-cooled island waste water is recycled to fill the fresh water tank 1, the excess recycled water is transported to the lime slurry preparation tank 3 through the second output pipeline 42. At this time, the first valve 311 is closed and the second valve 421 is opened. When making pulp, there is no need to inject production water into the tank again, thereby reducing the consumption of production water; when the recycled waste water cannot meet the water demand for lime slurry preparation, the second valve 421 can be closed and the first valve 311 can be opened, and then it is possible to make pulp using production water again. Such a design can make full use of the recycled water of the air-cooled island, and the dual routes for supplying water for pulp making can ensure the safety and reliability of pulp making, so that it is possible to freely switch between production water or recycled water as the supply of water for pulp making.

[0037] Further, in order to smoothly transport the recycled water to the flue gas cooling water tank 2 and the lime slurry preparation tank 3, a first booster pump 411 is connected to the first output pipeline 41 on the side close to the input end. At the same time, a second booster pump 422 is connected to the second output pipeline 42 on the side close to the input end. The first booster pump 411 can boost the water in the first output pipeline 41 and smoothly transport the clear water to the flue gas cooling water tank 2, while the second booster pump 422 can boost the water in the second output pipeline 42, so as to smoothly transport the clear water to the lime slurry preparation tank.

[0038] Further, since there are different working conditions during the preparation of lime slurry in the lime slurry preparation tank 3, this will result in different amounts of water required for slurry preparation in the lime slurry preparation tank 3 under different working conditions. When the water demand of the lime slurry preparation tank 3 changes, the pressure or flow rate at the outlet of the second booster pump 422 on the second output pipeline 42 will change. In this regard, a recirculation pipeline 5 is also connected to the second output pipeline 42 on the side close to the output end. The input end of the recirculation pipeline 5 is connected to the second booster pump 422. At the same time, the output end of the recirculation pipeline 5 is connected to the clear water tank 1, and the recirculation pipeline 5 is independent of the production water pipeline 31.

[0039] If the flow rate of the recycled water required by the lime slurry preparation tank 3 is lower than the rated flow rate output by the second booster pump 422, the excess recycled water can flow back to the clear water tank 1 for storage through the recirculation pipeline 5, so as to adjust the water pressure and flow rate at the outlet end of the second booster pump 422 by using the recirculation pipeline 5 and improve the stability of the system operation.

[0040] Further, in order to realize the automatic adjustment of the pressure at the outlet end of the second booster pump 422, a third valve 51 is fixed at the input end of the recirculation pipeline 5. The third valve 51 can be an electromagnetic valve. At the same time, a pressure sensor 423 is fixed at the output end of the second booster pump 422 on the second output pipeline 42. The pressure sensor 423 can monitor the pressure at the outlet of the second booster pump 422 in the second output pipeline 42 in real time. When the pressure in the second output pipeline 42 increases, the third valve 51 opens, and the excess recycled water flows into the recirculation pipeline 5, so as to achieve the purpose of automatically adjusting the pipeline pressure and flow rate.

[0041] Further, to improve the stability of the system, a fourth valve 412 is fixed at the first output pipeline 41 on the side close to the input end. At the same time, a fifth valve 424 is fixed at the second output pipeline 42 on the side close to the input end. By closing the fourth valve 412 or the fifth valve 424 separately, the first output pipeline 41 or the second output pipeline 42 can be shielded, so that the system has high operability in the face of emergencies.

[0042] The implementation principle of the waste water recycling and reuse system for an air-cooled island in Embodiment 1 of the present application is as follows: When the waste water from the air-cooled island is recycled to fill the clean water tank 1, the excess recycled water is transported through the second output pipeline 42 into the lime slurry preparation tank 3. When slurry preparation is required, there is no need to inject production water into the tank anymore, thus reducing the consumption of production water. When the recycled waste water cannot meet the water demand for lime slurry preparation, only production water can be used for slurry preparation. Such a design can, while ensuring the supply of water to the flue gas cooling water tank 2, make full use of the recycled water from the air-cooled island.

[0043] Embodiment 2:

[0044] The difference between Embodiment 2 and Embodiment 1 lies in that, referring to Figure 2 , the clean water tank 1 includes a first water storage tank 11 and a second water storage tank 12. The water inlet end of the first water storage tank 11 is connected to the output end of the recycling pump in the waste water tank of the air-cooled island, and the water outlet end of the first water storage tank 11 is connected to the input end of the first output pipeline 41. The first water storage tank 11 is connected to the second water storage tank 12 through a transfer pipeline 6. The water outlet end of the second water storage tank 12 is connected to the input end of the second output pipeline 42. The output end of the recirculation pipeline 5 is connected to the second water storage tank 12. To ensure that the first water storage tank 11 always retains recycled water specifically for the flue gas cooling water tank 2, the lowest retention water level is marked in the first water storage tank 11, and a water level sensor is fixed at the position corresponding to the lowest retention water level in the first water storage tank 11.

[0045] The first water storage tank 11 is used to store the recycled water from the recycling pump. When the recycled water in the first water storage tank 11 is full, the excess recycled water enters the second water storage tank 12 for storage. The water in the first water storage tank 11 is specifically for the flue gas cooling water tank 2, while the water in the second water storage tank 12 can supply both the lime slurry preparation tank 3 and the flue gas cooling water tank 2, but mainly supplies water to the lime slurry preparation tank 3. The second output pipeline 42 can cut off the water supply to the flue gas cooling water tank 2 through a stop valve, so that the second output pipeline 42 supplies water to the flue gas cooling water tank 2 only as an alternative. Since the demand for flue gas cooling water is irregular, to ensure that the first water storage tank 11 always retains recycled water specifically for the flue gas cooling water tank 2, when the water level sensor monitors that the water level in the first water storage tank 11 drops to the lowest retention water level, the first water storage tank 11 stops supplying water to the second water storage tank 12, thereby ensuring that the recycled water in the first water storage tank 11 always remains above the lowest retention water level.

[0046] Further, a third booster pump 61 and a check valve 62 are connected to the transfer pipeline 6. The third booster pump 61 is used to convey the recycled water from the first water storage tank 11 to the second water storage tank 12. When the water level in the first water storage tank 11 reaches above the minimum retention water level, the recycled water can be conveyed into the second water storage tank 12 through the third booster pump 61. The check valve 62 provided on the transfer pipeline 6 prevents the water entering the second water storage tank 12 from flowing back into the first water storage tank 11, so that the first water storage tank 11 and the second water storage tank 12 become two non-interfering water storage systems.

[0047] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An air-cooled island waste water recycling and reuse system, characterized in that: including a fresh water tank (1), the water inlet end of the fresh water tank (1) is used to communicate with the output end of a recycling pump; a lime slurry preparation tank (3) for preparing lime slurry after adding fresh water, the water inlet end of the lime slurry preparation tank (3) is connected with a production water pipeline (31), and the production water pipeline (31) is used to convey production water to the lime slurry preparation tank (3); the water outlet end of the fresh water tank (1) is respectively connected with an independent first output pipeline (41) and a second output pipeline (42), the output end of the first output pipeline (41) is used to communicate with a flue gas cooling water tank (2), and the output end of the second output pipeline (42) is connected with the production water pipeline (31).

2. The air-cooled island wastewater recycling and reuse system according to claim 1, wherein: a first valve (311) is arranged on the production water pipeline (31) close to the input end side, and a second valve (421) is arranged on the second output pipeline (42) close to the output end side.

3. The air-cooled island waste water recycling and reuse system according to claim 1, wherein: a first booster pump (411) is arranged on the first output pipeline (41) close to the input end side, and a second booster pump (422) is arranged on the second output pipeline (42) close to the input end side.

4. The air-cooled island waste water recycling and reuse system according to claim 3, characterized in that: the output end of the second output pipeline (42) is connected with a recirculation pipeline (5), the recirculation pipeline (5) is independent of the production water pipeline (31), and the output end of the recirculation pipeline (5) is connected with the fresh water tank (1).

5. The air-cooled island wastewater recycling and reuse system according to claim 4, wherein: a third valve (51) is arranged at the input end of the recirculation pipeline (5), and a pressure sensor (423) is arranged at the output end of the second output pipeline (42) of the second booster pump (422).

6. The air-cooled island waste water recycling and reuse system according to claim 1, characterized in that: a fourth valve (412) is arranged on the first output pipeline (41) close to the input end side, and a fifth valve (424) is arranged on the second output pipeline (42) close to the input end side.

7. The air-cooled island wastewater recycling and reuse system according to claim 6, characterized in that: the fresh water tank (1) includes a first water storage tank (11) and a second water storage tank (12), the first water storage tank (11) is used to communicate with the output end of a recycling pump, and the water outlet end of the first water storage tank (11) is connected with the input end of the first output pipeline (41), the first water storage tank (11) is connected with the second water storage tank (12) through a transfer pipeline (6), the water outlet end of the second water storage tank (12) is connected with the input end of the second output pipeline (42), a lowest retention water level is arranged in the first water storage tank (11), and a water level sensor is arranged at the position corresponding to the lowest retention water level in the first water storage tank (11).

8. The air-cooled island waste water recycling and reuse system according to claim 7, characterized in that: a third booster pump (61) and a check valve (62) are arranged on the transfer pipeline (6), and the third booster pump (61) is used to convey recycled water from the first water storage tank (11) to the second water storage tank (12).

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