Lithium ion battery plant steam condensate water recycling system

Abstract

The utility model discloses a lithium ion battery factory steam condensate water recycling system, including the condensate water collecting tank who links with workshop area pressure condensate water drainage pipeline, the tank top links with steam water heat exchanger through the flash steam pipe, and steam water heat exchanger sets up on air conditioning heating return water pipe, the condensate water collecting tank links with high temperature condensate water tank, organic rankine cycle generator unit, first plate heat exchanger links with second plate heat exchanger, third plate heat exchanger links through the pipeline in proper order, and organic rankine cycle generator unit, first plate heat exchanger links with second plate heat exchanger, and the third plate heat exchanger is provided with bypass pipe between third plate heat exchanger, and third plate heat exchanger export links with low temperature condensate water tank through steam condensate water cooling tower or bypass pipe, and the outlet of low temperature condensate water tank is provided with low temperature soft water water supply pipe. The utility model makes full use of the low grade heat energy and condensate water itself that steam condensate water contains, and has reduced the comprehensive energy consumption of lithium ion battery factory.

Description

Technical Field

[0001] This utility model relates to the field of steam condensate recovery and utilization technology, and in particular to a steam condensate recovery and utilization system for lithium-ion battery factories. Background Technology

[0002] In recent years, with the widespread adoption and promotion of new energy vehicles, electrochemical energy storage, and mobile phones, the lithium battery industry has experienced rapid development. Lithium battery plants consume a significant amount of steam. Taking a 15GWh battery project in Suzhou as an example, steam consumption accounts for 50.2% of the plant's total energy consumption, amounting to 4.01 million tons per year. Steam is mainly used in two ways: firstly, in the coating and drying process of lithium-ion battery production; and secondly, to maintain the constant temperature and humidity environment required for plant production, for the regeneration and heating of dehumidifiers and air conditioners.

[0003] To optimize the business environment and attract industrial investment, local governments typically construct municipal steam pipeline networks to facilitate enterprise access, effectively reducing the initial investment and daily operating costs for lithium battery companies. However, due to various reasons, municipal steam systems generally do not recycle and reuse steam condensate. Steam condensate has two important values: firstly, its high temperature and rich low-grade heat energy; secondly, it is deionized water, pure and resistant to scaling, although the production cost of such deionized water in factories is relatively high.

[0004] Currently, most lithium-ion battery factories have not established effective recycling mechanisms for steam condensate, or have failed to fully explore its potential value, often discharging it directly. During the discharge process, low-temperature tap water must be added to cool the water to below 40°C, further resulting in a double waste of energy and water resources. Summary of the Invention

[0005] To address the aforementioned problems, this utility model provides a system for recovering and utilizing steam condensate from a lithium-ion battery factory. This system can fully utilize the low-grade heat energy contained in the steam condensate and also reuse the condensate itself. Specifically, the following technical solution can be adopted: The lithium-ion battery factory steam condensate recovery and utilization system of this utility model includes a condensate manifold, which is connected to the pressurized condensate drainage pipe of the workshop. A flash steam pipe is installed on the top of the condensate manifold, and the flash steam pipe is connected to a steam-water heat exchanger, which is installed on the air conditioning and heating return water pipe. The drain outlet of the condensate manifold is connected to a high-temperature condensate tank via a pipe. The outlet of the high-temperature condensate tank is connected to a primary hot water pipe, which is connected to an organic Rankine cycle generator set. The organic Rankine cycle generator set is connected to a first plate heat exchanger via a secondary hot water pipe. The first plate heat exchanger is connected to a second plate heat exchanger via a tertiary hot water pipe. The second plate heat exchanger is connected to a third plate heat exchanger via a quaternary hot water pipe. The third plate heat exchanger is connected to a steam cooling system via a quinary hot water pipe. The steam condensate cooling tower is connected to a condensate cooling tower, which is connected to a low-temperature condensate tank via a six-stage hot water pipe. A low-temperature soft water supply pipe is installed at the outlet of the low-temperature condensate tank. A first bypass pipe is installed between the first-stage and third-stage hot water pipes. A second bypass pipe is installed between the first bypass pipe and the fourth-stage hot water pipe. A third bypass pipe is installed between the second bypass pipe and the fifth-stage hot water pipe. A fourth bypass pipe is installed between the sixth-stage and fifth-stage hot water pipes. A condensate recovery pump is installed on the pipe between the condensate manifold and the high-temperature condensate tank. A condensate utilization pump is installed at the outlet of the high-temperature condensate tank. Valves are installed on the first-stage, second-stage, third-stage, fourth-stage, fifth-stage, sixth-stage hot water pipes, the first bypass pipe, the second bypass pipe, the third bypass pipe, and the fourth bypass pipe.

[0006] This invention first centrally collects pressurized condensate from each workshop into a normal-pressure condensate manifold. Due to a sudden pressure drop generating flash steam, a steam-water heat exchanger is installed to recover its heat before it is released into the atmosphere. This heat is then used to heat the workshop's air conditioning water. The flash steam is then converted back into condensate and flows back into the condensate manifold. The low-grade heat energy contained in the condensate in the manifold is first converted into electrical energy by an organic Rankine cycle generator set to supply the factory's electricity. Then, it undergoes heat exchange through multiple plate heat exchangers, used for heating the workshop's air conditioning water, domestic hot water, and tap water in the ultrapure water preparation system, thus maximizing the utilization of the condensate's heat energy. Finally, the condensate is cooled to a suitable temperature for use as low-temperature soft water replenishment for the factory's chillers, air compressors, and other process equipment. This process fully utilizes the low-grade heat energy contained in the steam condensate and the condensate itself, reducing the overall energy consumption of the lithium-ion battery factory.

[0007] Preferably, the pressurized condensate drainage pipeline in the workshop includes a 0.8 MPa coating drying steam condensate drainage pipeline and other steam condensate drainage pipelines at 0.5 MPa. Lithium-ion battery factories typically include both types of pressurized condensate. Without heat recovery, the "white vapor" generated by flash evaporation after entering the condensate manifold not only easily causes water vapor corrosion to surrounding equipment but also wastes a large amount of latent heat of vapor.

[0008] Preferably, the organic Rankine cycle generator set is connected to the tap water system. The heated tap water is connected to the cold water inlet of the third plate heat exchanger through a pipeline, and the cold water outlet of the third plate heat exchanger is connected to the ultrapure water preparation system through a pipeline. After the high-temperature condensate is collected in the water tank, its heat energy is first used to drive the organic Rankine cycle generator set to generate electricity. The tap water that is about to enter the ultrapure water system is used as a cold source, and the high-temperature condensate can be cooled from 95°C to 70°C. The specific volume of water is 4.18 kJ / kg·K. Assuming a power generation efficiency of 10%, and taking a condensate flow rate of 1 t / h, an annual base of 330 days, 22 hours per day, and a total annual working hours of 7260 hours as an example, the theoretical annual power generation is 7260*1000*(95-70)*4.18*10% / 3600=21,000 kWh. The tap water used to prepare ultrapure water is heated through the third plate heat exchanger, and the condensate is cooled from 50°C to 33°C. Taking a condensate flow rate of 1t / h, an annual base of 330 days, 22 hours per day, and a total annual working hours of 7260h as an example, with a heat exchange efficiency of 95%, the annual recoverable heat is 7260*1000*(50-33)*4.18*0.95=490.1MJ.

[0009] Preferably, the cold water inlet of the first plate heat exchanger is connected to the air conditioning heating return water pipe from the outlet of the steam-water heat exchanger, and the cold water outlet of the first plate heat exchanger is connected to the air conditioning heating supply water pipe. Under normal circumstances, the condensate water passing through the first plate heat exchanger can be cooled from 70℃ to 62℃. Taking a condensate flow rate of 1t / h, a yearly base of 330 days, 22 hours per day, and a total annual working hours of 7260 hours as an example, with a heat exchange efficiency of 95%, the annual recoverable heat is 7260*1000*(70-62)*4.18*0.95=230.6MJ.

[0010] Preferably, the cold water inlet of the second plate heat exchanger is connected to the domestic hot water return pipe, and the cold water outlet of the second plate heat exchanger is connected to the domestic hot water supply pipe. Under normal circumstances, the condensate water passing through the second plate heat exchanger can be cooled from 62℃ to 50℃. Taking a condensate flow rate of 1t / h, a yearly base of 330 days, 22 hours per day, and a total annual working hours of 7260 hours as an example, with a heat exchange efficiency of 95%, the annual recoverable heat is 7260*1000*(62-50)*4.18*0.95=345.9MJ.

[0011] This utility model provides a comprehensive steam condensate recovery and utilization system for lithium-ion battery factories. Based on a detailed investigation of the heat usage of equipment within the factory and combined with existing steam condensate process parameters, it designs a system that integrates flash steam heat recovery, thermal power generation, air conditioning and heating, domestic hot water supply, ultrapure water heating from tap water, and low-temperature process soft water replenishment. It cleverly incorporates a steam-water heat exchanger to utilize the flash steam heat for heating the workshop's air conditioning water. Simultaneously, according to the heat requirements of the target equipment, a series-connected plate heat exchanger is used to utilize the latent heat energy of the steam condensate in a tiered manner, maximizing the release of the latent heat carried by the steam condensate. Finally, the low-temperature steam condensate is used for soft water replenishment for various process equipment. This utility model fully utilizes the low-grade heat energy contained in the steam condensate and the condensate itself, reducing the overall energy consumption of lithium-ion battery factories and achieving good economic benefits. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0013] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific working processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0014] like Figure 1 As shown, the lithium-ion battery factory steam condensate recovery and utilization system of this utility model includes a condensate manifold 1 connected to the pressurized condensate drainage pipe of the workshop. The pressurized condensate drainage pipe of the workshop typically includes a 0.8 MPa coating drying steam condensate drainage pipe 201 and other 0.5 MPa steam condensate drainage pipes 202.

[0015] A flash steam pipe 101 is installed on the top of the condensate manifold 1. The flash steam pipe 101 is connected to the steam-water heat exchanger 3, which is installed on the air conditioning heating return water pipe 401. The drain outlet of the condensate manifold 1 is connected to the high-temperature condensate tank 5 through a pipe. A condensate recovery pump 102 is installed on the aforementioned connecting pipe. The outlet of the high-temperature condensate tank 5 is connected to the primary hot water pipe 501. A condensate utilization pump 502 is installed on the primary hot water pipe 501. The primary hot water pipe 501 is connected to the hot water inlet of the organic Rankine cycle generator set 6. The potential energy of the condensate in the primary hot water pipe 501 is used to drive the organic Rankine cycle generator set 6 to generate electricity. The hot water outlet of the organic Rankine cycle generator set 6 is connected to the secondary hot water pipe 601, which is connected to the hot water inlet of the first plate heat exchanger 7. The hot water outlet of the first plate heat exchanger 7 is connected to the hot water inlet of the second plate heat exchanger 8 via the tertiary hot water pipe 701. The hot water outlet of the second plate heat exchanger 8 is equipped with a quaternary hot water pipe 801, which is connected to the hot water inlet of the third plate heat exchanger 9. The hot water outlet of the third plate heat exchanger 9 is equipped with a quinary hot water pipe 901, which is connected to the inlet of the steam condensate cooling tower 10. The outlet of the steam condensate cooling tower 10 is connected to the inlet of the low-temperature condensate tank 11 via a sixth hot water pipe 1001. The outlet of the low-temperature condensate tank 11 is equipped with a low-temperature soft water makeup pipe 1101.

[0016] The chilled water inlet of the aforementioned organic Rankine cycle generator set 6 is connected to the municipal water supply system, and the chilled water outlet is connected to the chilled water inlet of the third plate heat exchanger 9 via a pipe, used to send heated municipal water into the third plate heat exchanger 9. The chilled water outlet of the third plate heat exchanger 9 is connected to the ultrapure water preparation system via a pipe. The chilled water inlet of the first plate heat exchanger 7 is connected to the air conditioning and heating return water pipe 401 from the outlet of the steam-water heat exchanger 3, and the chilled water outlet of the first plate heat exchanger 7 is connected to the air conditioning and heating supply water pipe 402. The chilled water inlet of the second plate heat exchanger 8 is connected to the domestic hot water return water pipe, and the chilled water outlet of the second plate heat exchanger is connected to the domestic hot water supply water pipe. In addition, a first bypass pipe 1201 is installed between the primary hot water pipe 501 and the tertiary hot water pipe 701; a second bypass pipe 1202 is installed between the first bypass pipe 1201 and the quaternary hot water pipe 801; a third bypass pipe 1203 is installed between the second bypass pipe 1202 and the quinary hot water pipe 901; and a fourth bypass pipe 1204 is installed between the sixth hot water pipe 1001 and the quinary hot water pipe 901. Valves are installed on all of the aforementioned primary hot water pipes 501, 601, 701, 801, 901, 1001, 1201, 1202, 1203, and 1204.

[0017] The steam condensate temperature in the aforementioned condensate manifold 1 and high-temperature condensate tank 5 is usually around 95°C (i.e., the steam condensate temperature in the primary hot water pipe 501 is approximately 95°C). When there is a large external heat demand, the steam condensate in the primary hot water pipe 501 passes sequentially through the organic Rankine cycle generator set 6, the first plate heat exchanger 7, the second plate heat exchanger 8, and the third plate heat exchanger 9, exchanging heat with the cold medium in each stage. In this case, the steam condensate temperature in the secondary hot water pipe 601 is approximately 70°C, the steam condensate temperature in the tertiary hot water pipe 701 is approximately 62°C, the steam condensate temperature in the quaternary hot water pipe 801 is approximately 50°C, and the steam condensate temperature in the quinary hot water pipe 901 is 33°C or lower. At this time, the steam condensate directly enters the low-temperature condensate tank 11 through the fourth bypass pipe 1204 for storage, and is then transported to the refrigeration unit, air compressor, and other process equipment as needed for low-temperature soft water replenishment.

[0018] When the operating conditions of the Organic Rankine Cycle Generator Set 6, the ultrapure water production system, the demand for air conditioning and heating, and the demand for domestic hot water change, the opening and closing states of the corresponding valves can be adjusted according to the actual situation. This allows the steam condensate to bypass the heat exchange and cooling processes of the Organic Rankine Cycle Generator Set 6, the first plate heat exchanger 7, the second plate heat exchanger 8, and / or the third plate heat exchanger 9, and directly reach the fifth-stage hot water pipe 901 via the first bypass pipe 1201, the second bypass pipe 1202, and / or the third bypass pipe 1203. Since the temperature of the steam condensate in the fifth-stage hot water pipe 901 is relatively high at this time, it needs to be cooled by the steam condensate cooling tower 10. After the steam condensate is cooled to below 33°C, it is collected in the low-temperature condensate tank 11 via the sixth-stage hot water pipe 1001, and then used for low-temperature soft water replenishment for the refrigeration unit, air compressor, and other process equipment.

[0019] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are 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.

Claims

1. A system for recovering and utilizing steam condensate from a lithium-ion battery factory, characterized in that: The system includes a condensate manifold, which is connected to the pressurized condensate drain pipe in the workshop. A flash steam pipe is installed at the top of the condensate manifold, and this flash steam pipe is connected to a steam-water heat exchanger, which is installed on the air conditioning / heating return water pipe. The drain outlet of the condensate manifold is connected to a high-temperature condensate tank via a pipe. The outlet of the high-temperature condensate tank is connected to a primary hot water pipe, which is connected to an organic Rankine cycle generator set. The organic Rankine cycle generator set is connected to a first plate heat exchanger via a secondary hot water pipe. The first plate heat exchanger is connected to a second plate heat exchanger via a tertiary hot water pipe. The second plate heat exchanger is connected to a third plate heat exchanger via a quaternary hot water pipe. The third plate heat exchanger is connected to a steam condensate cooling tower via a quinary hot water pipe. The condensate cooling tower is connected to a low-temperature condensate tank via six stages of hot water pipes. A low-temperature soft water supply pipe is installed at the outlet of the low-temperature condensate tank. A first bypass pipe is installed between the first and third stages of hot water pipes. A second bypass pipe is installed between the first and fourth stages of hot water pipes. A third bypass pipe is installed between the second and fifth stages of hot water pipes. A fourth bypass pipe is installed between the sixth and fifth stages of hot water pipes. A condensate recovery pump is installed on the pipe between the condensate manifold and the high-temperature condensate tank. A condensate utilization pump is installed at the outlet of the high-temperature condensate tank. Valves are installed on the first, second, third, fourth, fifth, and sixth stages of hot water pipes, as well as the first, second, third, and fourth bypass pipes.

2. The lithium-ion battery factory steam condensate recovery and utilization system according to claim 1, characterized in that: The pressurized condensate drainage pipeline in the workshop includes a 0.8 MPa coating drying steam condensate drainage pipeline and other 0.5 MPa steam condensate drainage pipelines.

3. The lithium-ion battery factory steam condensate recovery and utilization system according to claim 1, characterized in that: The organic Rankine cycle generator set is connected to the tap water system. The heated tap water is connected to the cold water inlet of the third plate heat exchanger through a pipeline. The cold water outlet of the third plate heat exchanger is connected to the ultrapure water preparation system through a pipeline.

4. The lithium-ion battery factory steam condensate recovery and utilization system according to claim 1, characterized in that: The cold water inlet of the first plate heat exchanger is connected to the air conditioning and heating return water pipe from the outlet of the steam-water heat exchanger, and the cold water outlet of the first plate heat exchanger is connected to the air conditioning and heating supply water pipe.

5. The lithium-ion battery factory steam condensate recovery and utilization system according to claim 1, characterized in that: The cold water inlet of the second plate heat exchanger is connected to the domestic hot water return pipe, and the cold water outlet of the second plate heat exchanger is connected to the domestic hot water supply pipe.

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