【Daily Question】Chemical Engineering Principles 565: Mixed Bed (May 27)
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This post was last edited by Zaihui Kangqiao on 2017-5-26 08:18. The Chemical Engineering Theory section is launching a \"One Question per Day\" activity starting today, aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\". We hope for your active support~~~ Replies to the \"One Question per Day\" activity can be viewed directly at **; the thread will be closed after 1 day! ! To encourage everyone’s continued participation this year! Participation earns 3 wealth points, with an additional 4 wealth points for correct answers~~~ Short answer question: What are the structural and operational differences between the mixed-bed systems used for desalinating supply water and those used for treating condensate water? Answer: (1) The requirements for the resin used are different; since the flow rate in high-speed mixed-bed systems is generally between 80 and 120 m/h, the mechanical strength of the resin required must be very high. Compared to ordinary mixed-bed systems, the resin particles should be larger and more uniform, as well as possess good hydraulic stratification properties. In terms of chemical properties, high-speed mixed-bed resins require a high exchange rate and a high working exchange capacity in order to achieve a longer operating cycle. (2) The amount of resin used varies; for conventional mixed-bed resins, the ratio of cationic to anionic resins is generally 1:2, while in high-speed mixed beds it is 1:1 or 2:1, with more cationic resins than anionic resins. (3) High-speed mixed-bed resins generally use external regeneration; there is no need for acid and alkali pipelines, but it is required that the fat-extraction device be capable of removing all the resin from within the tank, and the water supply and drainage systems must ensure even distribution of water. (4) The water quality standards for the effluent from high-speed mixed-bed reactors are higher than those for ordinary mixed-bed reactors. For conventional mixed-bed resins, the conductivity should be below 0.2 μs/cm, while for high-speed mixed-bed resins it should be below 0.15 μs/cm. The silica content in conventional mixed-bed resins should be below 20 μg/L, and in high-speed mixed-bed resins it should be below 10 μg/L. (5) Different regeneration processes exist; when regenerating high-speed mixed-bed resins, it is often necessary to use air for scrubbing in order to remove the trapped contaminants and ensure that the resin maintains good performance.
(1) The requirements for the resin used are different; since the flow rate in high-speed mixed-bed systems is generally between 80 and 120 m/h, the mechanical strength of the resin must be sufficiently high. Compared to ordinary mixed-bed systems, the resin should have larger and more uniform particle sizes, as well as good hydraulic stratification properties. In terms of chemical properties, high-speed mixed-bed resins require a high exchange rate and a high working exchange capacity in order to achieve a longer operating cycle. (2) The amount of resin used varies; for conventional mixed-bed resins, the ratio of cationic to anionic resins is generally 1:2, while in high-speed mixed beds it is 1:1 or 2:1, with more cationic resins than anionic resins. (3) High-speed mixed-bed resins generally use external regeneration; there is no need for acid and alkali pipelines, but it is required that the fat-extraction device be capable of removing all the resin from within the tank, and the water supply and drainage systems must ensure even distribution of water. (4) The water quality standards for the effluent from high-speed mixed-bed reactors are higher than those for ordinary mixed-bed reactors. For ordinary mixed-bed resins, the conductivity should be below 0.2 s/cm, while for high-speed mixed-bed resins it should be below 0.15 s/cm. The silica content in ordinary mixed-bed resins should be below 20 g/L, and in high-speed mixed-bed resins it should be below 10 g/L. (5) Different regeneration processes exist; when regenerating high-speed mixed-bed resins, it is often necessary to use air for scrubbing in order to remove the trapped contaminants and ensure that the resin maintains good performance.
(1) The requirements for the resin used are different; since the flow rate in high-speed mixed-bed systems is generally between 80 and 120 m/h, the mechanical strength of the resin must be sufficiently high. Compared to ordinary mixed-bed systems, the resin should have larger and more uniform particle sizes, as well as good hydraulic stratification properties. In terms of chemical properties, high-speed mixed-bed resins require a high exchange rate and a high working exchange capacity in order to achieve a longer operating cycle. (2) The amount of resin used varies; for conventional mixed-bed resins, the ratio of cationic to anionic resins is generally 1:2, while in high-speed mixed beds it is 1:1 or 2:1, with more cationic resins than anionic resins. (3) High-speed mixed-bed resins generally use external regeneration; there is no need for acid and alkali pipelines, but it is required that the fat-extraction device be capable of removing all the resin from within the tank, and the water supply and drainage systems must ensure even distribution of water. (4) The water quality standards for the effluent from high-speed mixed-bed reactors are higher than those for ordinary mixed-bed reactors. For ordinary mixed-bed systems, the conductivity is required to be below 0.2 μs/cm, while for high-speed mixed-bed systems it should be below 0.15 μs/cm. The silica content in ordinary mixed-bed systems is required to be below 20 μg/L, and in high-speed mixed-bed systems it should be below 10 μg/L. (5) Different regeneration processes exist; when regenerating high-speed mixed-bed resins, it is often necessary to use air for scrubbing in order to remove the trapped contaminants and ensure that the resin maintains good performance.
(1) The requirements for the resin used are different; since the flow rate in high-speed mixed-bed systems is generally between 80 and 120 m/h, the mechanical strength of the resin must be sufficiently high. Compared to ordinary mixed-bed systems, the resin should have larger and more uniform particle sizes, as well as good hydraulic stratification properties. In terms of chemical properties, high-speed mixed-bed resins require a high exchange rate and a high working exchange capacity in order to achieve a longer operating cycle. (2) The amount of resin used varies; for conventional mixed-bed resins, the ratio of cationic to anionic resins is generally 1:2, while in high-speed mixed beds it is 1:1 or 2:1, with more cationic resins than anionic resins. (3) High-speed mixed-bed resins generally use external regeneration; there is no need for acid and alkali pipelines, but it is required that the fat-extraction device be capable of removing all the resin from within the tank, and the water supply and drainage systems must ensure even distribution of water. (4) The water quality standards for the effluent from high-speed mixed-bed reactors are higher than those for ordinary mixed-bed reactors. For conventional mixed-bed resins, the conductivity should be below 0.2 μs/cm, while for high-speed mixed-bed resins it should be below 0.15 μs/cm. The silica content in conventional mixed-bed resins should be below 20 μg/L, and in high-speed mixed-bed resins it should be below 10 μg/L. (5) Different regeneration processes exist; when regenerating high-speed mixed-bed resins, it is often necessary to use air for scrubbing in order to remove the trapped contaminants and ensure that the resin maintains good performance.
1. The requirements for the resin used are different; since the flow rate in high-speed mixed-bed systems is generally between 80 and 120 m/h, the mechanical strength of the resin must be sufficiently high. Compared to ordinary mixed-bed systems, the resin should have larger and more uniform particle sizes, as well as good hydraulic stratification properties. In terms of chemical properties, high-speed mixed-bed resins require a high exchange rate and a high working exchange capacity in order to achieve a longer operating cycle. 2. The amount of resin used varies; for conventional mixed-bed resins, the ratio of cationic to anionic resins is generally 1:2, while in high-speed mixed beds it is 1:1 or 2:1, with more cationic resins than anionic resins. 3. High-speed mixed-bed resins are generally regenerated externally; there is no need for acid and alkali pipelines, but it is required that the fat-removal device be capable of removing all the resin from within the tank, and the water supply and drainage systems must ensure even distribution of water. 4. The water quality standards for the output water of high-speed mixed-bed resins are higher than those of ordinary mixed-bed resins. For conventional mixed-bed resins, the conductivity should be below 0.2 µs/cm, while for high-speed mixed-bed resins it should be below 0.15 µs/cm. The silica content in conventional mixed-bed resins should be below 20 µg/L, and in high-speed mixed-bed resins it should be below 10 µg/L. 5. The regeneration processes differ; when regenerating high-speed mixed-bed resins, it is often necessary to use air for scrubbing in order to remove the trapped contaminants and ensure that the resin maintains good performance.
(1) The requirements for the resin used are different; since the flow rate in high-speed mixed-bed systems is generally between 80 and 120 m/h, the mechanical strength of the resin must be sufficiently high. Compared to ordinary mixed-bed systems, the resin should have larger and more uniform particle sizes, as well as good hydraulic stratification properties. In terms of chemical properties, high-speed mixed-bed resins require a high exchange rate and a high working exchange capacity in order to achieve a longer operating cycle. (2) The amount of resin used varies; for conventional mixed-bed resins, the ratio of cationic to anionic resins is generally 1:2, while in high-speed mixed beds it is 1:1 or 2:1, with more cationic resins than anionic resins. (3) High-speed mixed-bed resins generally use external regeneration; there is no need for acid and alkali pipelines, but it is required that the fat-extraction device be capable of removing all the resin from within the tank, and the water supply and drainage systems must ensure even distribution of water. (4) The water quality standards for the effluent from high-speed mixed-bed reactors are higher than those for ordinary mixed-bed reactors. For conventional mixed-bed resins, the conductivity should be below 0.2 μs/cm, while for high-speed mixed-bed resins it should be below 0.15 μs/cm. The silica content in conventional mixed-bed resins should be below 20 μg/L, and in high-speed mixed-bed resins it should be below 10 μg/L. (5) Different regeneration processes exist; when regenerating high-speed mixed-bed resins, it is often necessary to use air for scrubbing in order to remove the trapped contaminants and ensure that the resin maintains good performance.
1) The requirements for the resin used are different; since the flow rate in high-speed mixed-bed systems is generally between 80 and 120 m/h, the mechanical strength of the resin must be sufficiently high. Compared to ordinary mixed-bed systems, the resin should have larger and more uniform particle sizes, as well as good hydraulic stratification properties. In terms of chemical properties, high-speed mixed-bed resins require a high exchange rate and a high working exchange capacity, so as to enable longer operating cycles. (2) Regarding the amount of resin used for filling, the typical ratio of cationic to anionic resins in a conventional mixed-bed system is 1:1 or 2:1, with more cationic resins than anionic resins. (3) High-speed mixed-bed resins generally use external regeneration; there is no need for acid and alkali pipelines, but it is required that the fat-extraction device be capable of removing all the resin from within the tank, and the water supply and drainage systems must ensure even distribution of water. (4) The water quality standards for the effluent from high-speed mixed-bed reactors are higher than those for ordinary mixed-bed reactors. For conventional mixed-bed resins, the conductivity should be below 0.2 μS/cm, while for high-speed mixed-bed resins it should be below 0.15 μS/cm. The silica content in conventional mixed-bed resins should be below 20 μg/L, and in high-speed mixed-bed resins it should be below 10 μg/L. (5) Different regeneration processes exist; when regenerating high-speed mixed-bed resins, it is often necessary to use air scrubbing to remove the trapped contaminants in order to ensure good performance of the resin.
(1) The requirements for the resin used are different; since the flow rate in high-speed mixed-bed systems is generally between 80 and 120 m/h, the mechanical strength of the resin must be sufficiently high. Compared to ordinary mixed-bed systems, the resin particles should be larger and more uniform, as well as possess good hydraulic stratification capabilities. In terms of chemical properties, high-speed mixed-bed resins require a high exchange rate and a high working exchange capacity, so as to enable longer operating cycles. (2) Regarding the amount of resin used for filling, the typical ratio of cationic to anionic resins in a conventional mixed-bed system is 1:1 or 2:1, with more cationic resins than anionic resins. (3) High-speed mixed-bed resins generally use external regeneration; there is no need for acid and alkali pipelines, but it is required that the fat-extraction device be capable of removing all the resin from within the tank, and the water supply and drainage systems must ensure even distribution of water. (4) The water quality standards for the effluent from high-speed mixed-bed reactors are higher than those for ordinary mixed-bed reactors. For conventional mixed-bed resins, the conductivity should be below 0.2 μS/cm, while for high-speed mixed-bed resins it should be below 0.15 μS/cm. The silica content in conventional mixed-bed resins should be below 20 μg/L, and in high-speed mixed-bed resins it should be below 10 μg/L. (5) Different regeneration processes exist; when regenerating high-speed mixed-bed resins, it is often necessary to use air scrubbing to remove the trapped contaminants in order to ensure good performance of the resin.
1. Use UPVC glue to connect the central pipe to the lower water distributor base. 2. Insert the glued central tube into the center of the bottom of the resin tank. After the water distributor is installed, ensure that the central tube is vertical relative to the center of the exchange tank, and cut off the excess UPVC pipe above the tank opening. 3. The connection between the central tube and the valve body should be at a 45-degree angle. 4. Tighten the connection between the controller and the resin tank, then adjust the direction to remove the fully automatic softening controller. Pour the specified amount of soft water resin into the resin tank along the gap of the central tube and spread it out, making sure to keep the central tube in the center of the resin tank at all times. Clean the upper part of the central tube and the end face of the resin tank, and apply silicone oil to the central tube and the sealing ring of the controller.
1. Use UPVC glue to connect the central pipe to the lower water distributor base. 2. Insert the glued central tube into the center of the bottom of the resin tank. After the water distributor is installed, ensure that the central tube is vertical relative to the center of the exchange tank, and cut off the excess UPVC pipe above the tank opening. 3. The connection between the central tube and the valve body should be at a 45-degree angle. 4. Tighten the connection between the controller and the resin tank, then adjust the direction to remove the fully automatic softening controller. Pour the specified amount of soft water resin into the resin tank along the gap of the central tube and spread it out, making sure to keep the central tube in the center of the resin tank at all times. Clean the upper part of the central tube and the end face of the resin tank, and apply silicone oil to the central tube and the sealing ring of the controller.
Please help the original poster delete the post! The computer is stuck. I posted a duplicate. :) Please