Condensate treatment system and process

Abstract

The present application relates to wastewater treatment technical field, specifically to condensate treatment system and process, including the system heat exchanger, multi-pass switching valve, bromine cooling machine, cooling unit, filter unit, mixed bed and boiler that are communicated in turn, the system heat exchanger output end is also connected with detection unit, and the detection unit output end is connected on multi-pass switching valve;One of the multi-pass switching valve outlet is connected to the input end of bromine cooling machine, and one of the multi-pass switching valve outlet is connected to the sewage treatment system;The cooling unit includes primary heat exchanger and secondary heat exchanger;The output end of the boiler is connected to the input end of the system heat exchanger;The bromine cooling machine is connected with chilled water pipe, through the technical scheme of the present application, the problem that the temperature of process condensate in mixed bed is long-term overproof due to the poor heat exchange effect of primary heat exchanger and secondary heat exchanger can be solved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a condensate treatment system and process. Background Technology

[0002] Currently, condensate is frequently generated in chemical production processes. Due to variations in process flow, the resulting condensate differs, with process condensate being a common type. Process condensate is the water produced when heating steam is condensed and liquefied between the chemical plant and the process medium, resulting in indirect heat exchange. For energy conservation and cost reduction, chemical plants typically recycle and reuse process condensate. However, as the condensate vapor flows through pipelines, heat exchangers, and collection tanks within the system, it comes into contact with the vessel walls. This can lead to impurities such as rust being carried into the condensate, as well as the seepage of the process medium exchanging heat with the condensate vapor. Consequently, the condensate contains numerous inorganic and organic impurities, resulting in pH and conductivity levels that are unacceptable.

[0003] Therefore, existing methods typically involve filtering and adsorbing inorganic impurities from the process condensate before it is recycled, and then further purifying it in a mixed bed to separate anions and cations and reduce conductivity, making the condensate usable again. However, mixed beds have strict requirements on the temperature, pH, and conductivity of the condensate entering them. To ensure the condensate reaches the required temperature for entering the mixed bed, a secondary heat exchanger and a primary heat exchanger are usually installed before the filter. The outlet pipe of the mixed bed passes through the secondary heat exchanger, which uses the relatively cooler process condensate flowing out of the mixed bed for cooling, while the primary heat exchanger uses circulating water for cooling. While this method can reduce the temperature of the process condensate to some extent, it presents the following problems:

[0004] 1. The process condensate temperature generated by the condensation of steam is too high, which leads to excessively high condensate inlet water temperature in the primary and secondary heat exchangers and scaling in the heat exchangers. This results in poor heat exchange performance in the primary and secondary heat exchangers, causing the process condensate temperature in the mixed bed to exceed the standard for a long time, making the mixed bed prone to damage.

[0005] 2. The condensate temperature entering the primary heat exchanger is too high, which requires a large amount of circulating water to exchange heat in the primary heat exchanger. After heat exchange, the heat energy is discharged into the atmosphere through the circulating water. Since the production process is continuous, excessive heat released into the atmosphere can easily cause environmental pollution and also waste water resources.

[0006] 3. The inability to detect whether the pH and conductivity of the process condensate entering the mixed bed are up to standard results in some process condensate with unqualified pH and conductivity entering the mixed bed, thus contaminating the mixed bed and causing it to malfunction, thereby affecting the overall production efficiency. Summary of the Invention

[0007] The present invention aims to provide a condensate treatment system and process that can solve the problem of poor heat exchange performance of the primary and secondary heat exchangers, which leads to the long-term excessive condensate temperature in the mixed bed process.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] The condensate treatment system includes a system heat exchanger, a multi-way switching valve, a bromine chiller, a cooling unit, a filtration unit, a mixed bed, and a boiler, connected in sequence. A detection unit is also connected to the output of the system heat exchanger, and the output of the detection unit is connected to the multi-way switching valve. One outlet of the multi-way switching valve is connected to the input of the bromine chiller, and another outlet is connected to the wastewater treatment system. The cooling unit includes a primary heat exchanger and a secondary heat exchanger. The output of the boiler is connected to the input of the system heat exchanger. Chilled water pipes are connected to the bromine chiller.

[0010] The technical principle of this solution is as follows: In this invention, a sampling tube is connected to the pipeline at the output end of the system heat exchanger. The high-temperature condensate flowing out of the system heat exchanger is transported to the detection unit through the sampling tube. The condensate that fails the water quality test by the detection unit is discharged into the sewage treatment system for treatment through a multi-way switching valve. The condensate that passes the test by the detection unit enters the bromine chiller through the multi-way switching valve. The bromine chiller is connected to chilled water pipes, through which chilled water return water is injected into the bromine chiller. Part of the heat energy of the high-temperature condensate flowing into the bromine chiller provides energy for its operation, thereby producing chilled water. The absorption of some of the heat energy of the high-temperature condensate by the bromine chiller lowers the temperature of the high-temperature condensate flowing out of the bromine chiller, which in turn lowers the temperature of the condensate flowing into the primary and secondary heat exchangers. When the secondary heat exchanger uses the low-temperature condensate flowing out of the mixed bed for cooling, and the primary heat exchanger uses circulating water for cooling, the operating pressure can be reduced. The temperature of the condensate after heat exchange in the primary and secondary heat exchangers can reach the standard for entering the mixed bed. At the same time, it can reduce the amount of circulating water used in the primary heat exchanger, which saves resources and reduces the amount of heat energy discharged into the atmosphere.

[0011] After heat exchange, the condensate flows out and is first filtered by a filtration unit to remove inorganic impurities. Then it enters the mixed bed. At this point, due to the absorption of some heat energy by the bromine chiller, and after heat exchange in the primary and secondary heat exchangers, the temperature of the condensate has reached the standard for entering the mixed bed. In the mixed bed, the condensate undergoes separation of anions and cations, reducing its conductivity, making it safer to flow into the boiler for heating and evaporation. When the condensate is heated and evaporated in the boiler, the generated steam is used in the system heat exchanger to provide energy, thus realizing the recycling of the condensate.

[0012] The beneficial effects of this plan are as follows:

[0013] 1. The condensate temperature always meets the standard for entering the mixed bed, thereby increasing the service life of the mixed bed resin and reducing consumption: This invention sets up a bromine chiller before the cooling unit, that is, before the secondary heat exchanger and the primary heat exchanger. When the high-temperature condensate in the system heat exchanger flows into the bromine chiller through the multi-way switching valve, part of the heat energy of the high-temperature condensate is recovered by the bromine chiller and used as the kinetic energy for the operation of the bromine chiller. This makes the heat of condensation flowing into the secondary heat exchanger and the primary heat exchanger lower, so that the condensate after heat exchange in the secondary heat exchanger and the primary heat exchanger will not exceed the standard of the mixed bed inlet water temperature, thereby increasing the service life of the mixed bed resin and reducing the consumption of the mixed bed resin. To address the problem of poor heat exchange efficiency in the primary and secondary heat exchangers, which led to persistently excessive temperatures of the condensate entering the mixed bed process, the inventors initially attempted to increase the number of primary heat exchangers in the system to exchange heat with the high-temperature condensate. However, after increasing the number of primary heat exchangers, they found that although the temperature of the condensate entering the mixed bed decreased, the heat exchanged by the primary heat exchangers was directly released into the atmosphere, which would have an environmental impact. Therefore, the inventors conducted in-depth research on how to lower the temperature of the high-temperature condensate without releasing heat into the atmosphere. Finally, they discovered that the bromine chiller could utilize the heat energy of the high-temperature condensate to power its own operation and achieve the purpose of producing chilled water. At the same time, the heat of the high-temperature condensate was absorbed and its temperature decreased, and the heat was directly absorbed by the bromine chiller without being released into the atmosphere, thus avoiding environmental impact.

[0014] 2. Improved production efficiency: In this invention, by setting up a bromine chiller before the secondary heat exchanger, the water production capacity of a single condensate mixed bed can exceed 120,000 tons, while in the prior art, without setting up a bromine chiller between the secondary heat exchangers, the water production capacity of a single condensate mixed bed is less than 80,000 tons.

[0015] 3. While ensuring that the temperature of the condensate always meets the standards for entering the mixed bed, the heat energy of the condensate can also be utilized to produce chilled water: This invention connects a chilled water pipe to the bromine chiller and injects chilled water return water into the bromine chiller through the chilled water pipe. When the high-temperature condensate enters the bromine chiller, its heat is recovered by the bromine chiller, providing energy for the operation of the bromine chiller, and thus successfully producing chilled water.

[0016] 4. Ensuring the quality of condensate entering the mixed bed is more qualified, thereby further guaranteeing the normal operation of the mixed bed and the safe operation of the subsequent boiler: This invention connects a detection unit to the output end of the system heat exchanger. When the high-temperature condensate flows out of the system heat exchanger, only the water quality that passes the detection unit test flows into the bromine chiller, while the unqualified water flows directly into the sewage treatment system for treatment. Furthermore, after the condensate is cooled by the cooling unit, it also passes through a filtration unit to remove impurities, further ensuring the quality of the condensate entering the mixed bed. The detection also ensures that the conductivity of the condensate flowing into the mixed bed is sufficiently low. This alleviates the working pressure of the mixed bed and prevents the condensate entering the boiler from having excessively high conductivity, which could be dangerous. It also prevents scaling of the system heat exchanger due to excessive conductivity, thus preventing a reduction in the heat transfer efficiency and service life of the system heat exchanger.

[0017] Furthermore, a sampling tube is connected to the side wall of the pipe connecting the system heat exchanger and the multi-way switching valve. The end of the sampling tube away from the pipe connecting the system heat exchanger and the multi-way switching valve is connected to the detection unit, and a shut-off valve is provided on the sampling tube.

[0018] By adopting the above technical solution, high-temperature condensate flowing out of the system's heat exchanger can be sampled through a sampling tube, and its water quality can then be tested. By installing a shut-off valve on the sampling tube, the flow rate of condensate sampling can be easily controlled. Through water quality testing, condensate with poor water quality can be discharged into the sewage treatment system, preventing it from entering the primary and secondary heat exchangers and the mixed bed. This avoids scaling in the primary and secondary heat exchangers and contamination of the mixed bed, thus maintaining the heat exchange efficiency of the primary and secondary heat exchangers and extending the service life of the mixed bed.

[0019] Furthermore, the detection unit includes a detection section and a control system. The detection section includes a pH detection section and a conductivity detection section. The output terminal of the control system is connected to the multi-way switching valve. The pH detection section, the conductivity detection section, the control system, and the multi-way switching valve are electrically connected. The control system controls the switching of the outlet of the multi-way switching valve based on the data signals detected by the pH detection section and the conductivity detection section.

[0020] The above technical solution uses a pH detection unit and a conductivity detection unit to detect the pH and conductivity of the condensate. When the detected pH value of the condensate is 7-10 and the conductivity is less than 10 μS / cm, the control system receives the data transmitted by the pH and conductivity detection units and then controls the multi-way switching valve to open the channel port to the bromine chiller, allowing qualified condensate to enter the bromine chiller. When the detected pH value of the condensate is less than 7 or greater than 10, or the conductivity is greater than or equal to 10 μS / cm, the control system controls the multi-way switching valve to open the channel port to the wastewater treatment system, allowing unqualified condensate to enter the wastewater treatment system. This ensures that the pH and conductivity of the condensate entering the mixed bed and boiler are qualified, guaranteeing the safe operation of the boiler, preventing explosion damage, and preventing scaling of the system heat exchanger due to excessive conductivity, which would reduce the heat transfer efficiency and service life of the system heat exchanger.

[0021] Furthermore, a secondary heat exchange tube is connected through the secondary heat exchanger, and the inlet end of the secondary heat exchange tube is connected to the outlet end of the mixed bed.

[0022] By adopting the above technical solution, a secondary heat exchange tube is connected through the secondary heat exchanger, and the liquid inlet of the secondary heat exchange tube is connected to the liquid outlet of the mixed bed. The low-temperature condensate flowing out of the liquid outlet of the mixed bed flows through the secondary heat exchange tube and exchanges heat with the high-temperature condensate flowing in from the bromine chiller in the secondary heat exchanger. This ensures that the temperature of the condensate flowing into the primary heat exchanger is low enough, and the temperature of the condensate flowing into the boiler is high enough, thereby reducing the consumption of circulating water in the primary heat exchanger, reducing the impact on the environment, and reducing the use of boiler fuel.

[0023] Furthermore, a circulating water heat exchange tube is connected through the primary heat exchanger, and the primary heat exchanger is connected to the liquid outlet end of the secondary heat exchanger.

[0024] By adopting the above technical solution, circulating water heat exchange tubes are connected through the primary heat exchanger, and circulating water feedwater is injected through the circulating water heat exchange tubes to exchange heat with the condensate in the primary heat exchanger. By connecting the primary heat exchanger to the outlet end of the secondary heat exchanger, the low-temperature condensate flowing out of the mixed bed outlet flows through the secondary heat exchange tubes and exchanges heat with the high-temperature condensate flowing into the secondary heat exchanger from the bromine chiller. This ensures that the temperature of the condensate flowing into the primary heat exchanger is low enough. Therefore, when using circulating water to exchange heat with the primary heat exchanger, the temperature of the primary heat exchanger can be lowered more quickly. When the temperature of the primary heat exchanger is lowered to a certain standard, the injection of circulating water can be stopped intermittently, thereby reducing the consumption of circulating water and saving water resources.

[0025] Furthermore, the filtration unit includes an activated carbon filter and a precision filter.

[0026] By using the above technical solution, inorganic impurities in the condensate flowing into the mixed bed can be filtered out.

[0027] Furthermore, a storage tank is provided between the multi-way switching valve and the bromine chiller, and a first water pump is connected to the storage tank, with the storage tank and the first water pump connected between the multi-way switching valve and the bromine chiller.

[0028] The above technical solution facilitates the storage of high-temperature condensate flowing out of the system heat exchanger, preventing excessive flow and overloading of the bromine chiller; and by connecting a first water pump to the storage tank, it is convenient to extract the condensate from the storage tank and transport it to the bromine chiller.

[0029] Furthermore, the outlet end of the bromine chiller is connected to a collection tank, and a second water pump is connected to the collection tank. The output end of the second water pump is connected to the inlet end of the secondary heat exchanger.

[0030] The above technical solution facilitates the storage of high-temperature condensate flowing out of the bromine chiller, preventing excessive flow and insufficient heat exchange when the high-temperature condensate flows through the secondary and primary heat exchangers. Furthermore, by connecting a second water pump to the collection tank, the condensate in the collection tank can be easily extracted and transported to the secondary heat exchanger.

[0031] Furthermore, the liquid outlet of the mixed bed is connected to a water tank, and the end of the water tank away from the mixed bed is connected to a third water pump. The output end of the third water pump is connected to the secondary heat exchange tube.

[0032] The above technical solution facilitates the storage of low-temperature condensate flowing out of the mixed bed, preventing excessive flow rate and ensuring that the low-temperature condensate flows too fast through the secondary heat exchange tubes, thus preventing sufficient heat exchange with the high-temperature condensate in the secondary heat exchanger. Furthermore, by connecting a third water pump to the water tank, it is convenient to extract the low-temperature condensate from the water tank and transport it to the boiler.

[0033] Furthermore, the present invention provides a condensate treatment process, utilizing the condensate treatment system described in any one of claims 1-9, wherein the condensate treatment process includes the following steps:

[0034] S1: Detection. The high-temperature condensate generated in chemical production is tested by the detection unit. Condensate with qualified water quality is discharged into the bromine chiller, and condensate with unqualified water quality is discharged into the sewage treatment system.

[0035] S2: Recover heat energy. The high-temperature condensate entering the bromine chiller has some heat energy recovered by the bromine chiller, providing energy for the bromine chiller to produce chilled water.

[0036] S3: Heat exchange and cooling, using a heat exchange unit to exchange heat and cool the high-temperature condensate;

[0037] S4: Filtration, using a filtration unit to filter inorganic impurities in the condensate after heat exchange and cooling.

[0038] S5: Purification, using a mixed bed to purify the condenser after filtering out inorganic impurities, removing anions and cations from the filtered condensate and reducing conductivity;

[0039] S6: Heating and evaporation. The purified condensate is heated to evaporate, and the steam is then used in chemical production.

[0040] By adopting the above technical solution, the pH and conductivity of the condensate entering the mixed bed can be made more compliant with standards through water quality testing, thereby ensuring the normal operation of the mixed bed, the safe operation of the boiler, and the heat transfer effect and service life of the system heat exchanger. Heat recovery allows for more rational use of the high-temperature condensate's heat energy and reduces the working pressure of the secondary and primary heat exchangers. Heat exchange cooling ensures the temperature of the condensate entering the mixed bed is more in line with the mixed bed's inlet water temperature standard. Filtration improves the condensate quality entering the mixed bed, removing inorganic impurities. Purification lowers the conductivity of the condensate, ensuring the safe operation of the boiler and preventing scaling on the system heat exchanger, which reduces heat transfer effect and service life. Heating and evaporation convert the condensate into steam, which can then be used in the system heat exchanger, thus achieving a cycle. Attached Figure Description

[0041] Figure 1 This is a flowchart illustrating an embodiment of the present invention. Detailed Implementation

[0042] The following detailed description illustrates the specific implementation method:

[0043] The reference numerals in the accompanying drawings include: system heat exchanger 1, three-way valve 2, detection unit 3, detection section 301, control system 302, storage tank 4, first water pump 5, bromine chiller 6, chilled water pipe 601, collection tank 7, second water pump 8, secondary heat exchanger 9, secondary heat exchange tube 901, primary heat exchanger 10, primary heat exchange tube 1001, activated carbon filter 11, precision filter 12, mixed bed 13, water tank 14, third water pump 15, boiler 16, sewage system 17, sampling pipe 18.

[0044] The basic implementation examples are as follows: Figure 1As shown: The condensate treatment system includes a system heat exchanger 1, a multi-way switching valve, a bromine chiller 6, a cooling unit, a filtration unit, a mixed bed 13, and a boiler 16, which are connected in sequence by pipelines. In this embodiment, the system heat exchanger 1 is specifically a steam heat exchanger. In this embodiment, the multi-way switching valve is a three-way valve 2. The inlet of the three-way valve 2 is connected to the liquid outlet of the system heat exchanger 1. One outlet of the three-way valve 2 is connected to the sewage treatment system, and the other outlet is connected to the storage tank 4. A sampling tube 18 is connected to the side wall of the pipe connecting the system heat exchanger 1 and the three-way valve 2. A shut-off valve is provided on the sampling tube 18. The end of the sampling tube 18 away from the pipe connecting the system heat exchanger 1 and the three-way valve 2 is connected to a detection unit 3. The detection unit 3 includes a detection section 301 and a control system 302. The detection section 301 includes a pH detection section and a conductivity detection section. The pH detection section is specifically an online pH meter, and the conductivity detection section is specifically an online conductivity meter. The control system 302 is specifically a DCS control system. Both the online pH meter and the online conductivity meter are connected to the sampling tube 1. At the end furthest from the heat exchanger 1 of the connection system, the three-way valve 2 is electrically connected to the DCS control system. The online pH and online conductivity detectors can detect the pH and conductivity values ​​of the condensate and generate detection signals. After receiving the detection signals, the DCS control system determines that the pH value is 7-10 and the conductivity is less than 10 μS / cm. The DCS control system then controls the outlet of the three-way valve 2 connected to the storage tank 4 to open, discharging the condensate into the storage tank 4, and subsequently into the bromine chiller 6. When any of the following conditions are met: the pH value is less than 7 or greater than 10, or the conductivity is greater than or equal to 10 μS / cm, the DCS control system controls the outlet of the three-way valve 2 connected to the sewage treatment system to open, thereby discharging the condensate into the sewage treatment system for treatment. A storage tank 4 connected to the outlet of the three-way valve 2 is used to store the qualified high-temperature condensate discharged from the system heat exchanger 1. A first water pump 5 is connected to the bottom end of the storage tank 4 away from the three-way valve 2. The output end of the first water pump 5 is connected to the input end of the bromine chiller 6. A chilled water pipe 601 is connected to the bromine chiller 6. Chilled water return water can be injected into the bromine chiller 6 through the chilled water pipe 601, thereby producing chilled water. A collection tank 7 is connected to the bottom end of the bromine chiller 6 away from the first water pump 5. A second water pump 8 is connected to the bottom end of the collection tank 7 away from the bromine chiller 6. The output end of the second water pump 8 is connected to a cooling unit.The cooling unit includes a secondary heat exchanger 9 and a primary heat exchanger 10. In this embodiment, the secondary heat exchanger 9 is specifically a condensate heat exchanger, and the primary heat exchanger 10 is specifically a circulating water heat exchanger. The secondary heat exchanger 9 is connected to the output end of the second water pump 8, and the primary heat exchanger 10 is connected to the end of the secondary heat exchanger 9 away from the second water pump 8. A secondary heat exchange tube 901 is connected to the secondary heat exchanger 9, and the secondary heat exchange tube 901 passes through the secondary heat exchanger 9. The output end of the secondary heat exchange tube 901 is connected to the boiler 16. A primary heat exchange tube 1001 is connected to the primary heat exchanger 10, and the primary heat exchange tube 1001 passes through the primary heat exchanger 10. A filter unit is connected to the liquid delivery end of the primary heat exchanger 10. The filtration unit includes an activated carbon filter 11 and a precision filter 12. The activated carbon filter 11 is connected to the liquid outlet of the primary heat exchanger 10, and the precision filter 12 is connected to the liquid outlet of the activated carbon filter 11. The liquid outlet of the precision filter 12 is connected to a mixed bed 13, and the liquid outlet of the mixed bed 13 is connected to a water tank 14. A third water pump 15 is connected to the bottom of the side of the water tank 14 away from the mixed bed 13. The output end of the third water pump 15 is connected to the liquid inlet of the secondary heat exchange tube 901. After the condensate in the water tank 14 is drawn out by the third water pump 15, it flows through the secondary heat exchange tube 901 and exchanges heat with the high-temperature condensate in the secondary heat exchanger 9. Finally, it flows into the boiler 16, where it is heated and evaporated. The output end is connected to the input end of the system heat exchanger 1. The condensate that has been heated and evaporated into steam is then transported back to the system heat exchanger 1 to be used as a heat source, thus realizing circulation.

[0045] This embodiment also discloses a condensate treatment process, which is based on the aforementioned condensate treatment system and includes the following steps:

[0046] S1: Detection. The high-temperature condensate generated in the chemical production is detected by the detection unit 3. The condensate with qualified water quality is discharged into the bromine chiller 6, and the condensate with unqualified water quality is discharged into the sewage treatment system.

[0047] When the high-temperature condensate flows out of the system heat exchanger 1, it flows through the sampling tube 18 into the online pH and online conductivity detectors. The online pH and online conductivity detectors detect the pH value and conductivity of the high-temperature condensate and generate detection signals. After receiving the detection signals, the DCS control system determines that the pH value is 7-10 and the conductivity is less than 10 μS / cm. The DCS control system then controls the outlet of the three-way valve 2 connected to the storage tank 4 to open, discharging the condensate into the storage tank 4, and subsequently into the bromine chiller 6. When the DCS control system determines that the pH value is less than 7 or greater than 10 or the conductivity is greater than or equal to 10 μS / cm, the DCS control system controls the outlet of the three-way valve 2 connected to the sewage treatment system to open, thereby discharging the condensate into the sewage treatment system for treatment.

[0048] S2: The heat energy is recovered and enters the high-temperature condensate of the bromine chiller 6. Part of the heat energy is recovered by the bromine chiller 6 to provide energy for the production of chilled water by the bromine chiller 6.

[0049] When the condensate with a pH value of 7-10 and a conductivity of less than 10 μS / cm, as determined by the online pH and conductivity meters, enters the storage tank 4, it is pumped into the bromine chiller 6 by the first water pump 5. At this time, part of the heat energy of the high-temperature condensate is recovered by the bromine chiller 6 and used as a heat source for the production of chilled water.

[0050] S3: Heat exchange and cooling, using a heat exchange unit to exchange heat and cool the high-temperature condensate;

[0051] The high-temperature condensate, after some heat energy is recovered in the bromine chiller 6, flows out of the bromine chiller 6 and enters the collection tank 7. It is then drawn into the secondary heat exchanger 9 by the second water pump 8. Since the secondary heat exchanger 9 is connected to the secondary heat exchange tube 901, and the secondary heat exchange tube 901 carries low-temperature condensate, the high-temperature condensate flowing from the collection tank 7 exchanges heat with the low-temperature condensate flowing in the secondary heat exchange tube 901. The condensate after heat exchange enters the primary heat exchanger 10 and exchanges heat with the circulating water in the primary heat exchange tube 1001 connected to the primary heat exchanger 10, further reducing the temperature of the condensate.

[0052] S4: Filtration, using a filtration unit to filter inorganic impurities in the condensate after heat exchange and cooling.

[0053] The condensate flowing out of the primary heat exchanger 10 then flows into the filtration unit, which includes an activated carbon filter 11 connected to the output end of the primary heat exchanger 10 and a precision filter 12 connected to the end of the activated carbon filter 11 away from the primary heat exchanger 10. Under the dual filtration of the activated carbon filter 11 and the precision filter 12, the inorganic impurities in the condensate flowing out of the primary heat exchanger 10 can be fully filtered.

[0054] S5: Purification, using mixed bed 13 to purify the condenser after filtering out inorganic impurities, removing anions and cations from the filtered condensate and reducing conductivity;

[0055] After being filtered by both activated carbon filter 11 and precision filter 12, the condensate flows into mixed bed 13. The mixed bed 13 removes anions and cations from the condensate, thereby reducing its conductivity. This allows the condensate to be used in the subsequent boiler 16. Reducing conductivity ensures the safe operation of the boiler 16 and prevents scaling on the system heat exchanger 1, which would reduce heat transfer efficiency and service life.

[0056] S6: Heating and evaporation. The purified condensate is heated to evaporate, and the steam is then used in chemical production.

[0057] After the conductivity of the condensate is reduced by the mixed bed 13, it flows into the water tank 14 for storage. Under the pumping of the third water pump 15, it passes through the secondary heat exchange tube 901 and exchanges heat with the high-temperature condensate in the secondary heat exchanger 9, thereby increasing its temperature. Finally, it enters the boiler 16. After passing through the secondary heat exchanger 9, the temperature of the condensate increases. When it is heated and evaporated in the boiler 16, the fuel consumption of the boiler 16 can be reduced. The condensate entering the boiler 16 is heated and evaporated, and the steam is used in the system heat exchanger 1, thus forming a cycle.

[0058] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A condensate treatment system, characterized in that: The system comprises, in sequence, a system heat exchanger, a multi-way switching valve, a bromine chiller, a cooling unit, a filtration unit, a mixed bed, and a boiler; the output of the system heat exchanger is also connected to a detection unit, the output of which is connected to the multi-way switching valve; one outlet of the multi-way switching valve is connected to the input of the bromine chiller, and the other outlet is connected to the wastewater treatment system; the cooling unit includes a primary heat exchanger and a secondary heat exchanger; the output of the boiler is connected to the input of the system heat exchanger. The bromine chiller is connected to a chilled water pipe; chilled water return water is injected into the bromine chiller through the chilled water pipe, and part of the heat energy of the high-temperature condensate flowing into the bromine chiller provides energy for the operation of the bromine chiller, thereby producing chilled water. Part of the heat energy of the high-temperature condensate is absorbed by the bromine chiller, which can reduce the temperature of the high-temperature condensate flowing out of the bromine chiller. The detection unit includes a detection section and a control system. The detection section includes a pH detection section and a conductivity detection section. The output of the control system is connected to a multi-port switching valve. The pH detection section, conductivity detection section, control system, and multi-port switching valve are electrically connected. The control system controls the switching of the multi-port switching valve outlet based on the data signals detected by the pH detection section and conductivity detection section. When the detected condensate pH value is 7-10 and the conductivity is less than 10 μS / cm, the control system receives the data transmitted by the pH detection section and conductivity detection section, and then controls the multi-port switching valve to open the channel between the multi-port switching valve and the bromine chiller, allowing qualified condensate to enter the bromine chiller. When the detected condensate pH value is less than 7 or greater than 10 or the conductivity is greater than or equal to 10 μS / cm, the control system controls the multi-port switching valve to open the channel between the multi-port switching valve and the wastewater treatment system, allowing unqualified condensate to enter the wastewater treatment system.

2. The condensate treatment system according to claim 1, characterized in that: A sampling tube is connected to the side wall of the pipe connecting the system heat exchanger and the multi-way switching valve. The end of the sampling tube away from the pipe connecting the system heat exchanger and the multi-way switching valve is connected to the detection unit, and a shut-off valve is provided on the sampling tube.

3. The condensate treatment system according to claim 2, characterized in that: The secondary heat exchanger is internally connected to a secondary heat exchange tube, and the inlet end of the secondary heat exchange tube is connected to the outlet end of the mixed bed.

4. The condensate treatment system according to claim 3, characterized in that: A circulating water heat exchange tube is connected through the primary heat exchanger, and the primary heat exchanger is connected to the liquid outlet end of the secondary heat exchanger.

5. The condensate treatment system according to claim 4, characterized in that: The filtration unit includes an activated carbon filter and a precision filter.

6. The condensate treatment system according to claim 5, characterized in that: A storage tank is provided between the multi-way switching valve and the bromine chiller. A first water pump is connected to the storage tank, and the storage tank and the first water pump are connected between the multi-way switching valve and the bromine chiller.

7. The condensate treatment system according to claim 6, characterized in that: The outlet of the bromine chiller is connected to a collection tank, and a second water pump is connected to the collection tank. The output of the second water pump is connected to the inlet of the secondary heat exchanger.

8. The condensate treatment system according to claim 7, characterized in that: The liquid outlet of the mixed bed is connected to a water tank, and the end of the water tank away from the mixed bed is connected to a third water pump. The output end of the third water pump is connected to the secondary heat exchange tube.

9. A condensate treatment process, characterized in that: The condensate treatment system according to any one of claims 1-8, wherein the condensate treatment process includes the following steps: S1: Detection. The high-temperature condensate generated in chemical production is tested by the detection unit. Condensate with qualified water quality is discharged into the bromine chiller, and condensate with unqualified water quality is discharged into the sewage treatment system. S2: Recover heat energy. The high-temperature condensate entering the bromine chiller has some heat energy recovered by the bromine chiller, providing energy for the bromine chiller to produce chilled water. S3: Heat exchange and cooling, using a heat exchange unit to exchange heat and cool the high-temperature condensate; S4: Filtration, using a filtration unit to filter inorganic impurities in the condensate after heat exchange and cooling. S5: Purification, using a mixed bed to purify the condenser after filtering out inorganic impurities, removing anions and cations from the filtered condensate and reducing conductivity; S6: Heating and evaporation. The purified condensate is heated to evaporate, and the steam is then used in chemical production.

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