A low-loss transmission dense moving bed apparatus and a method for operating the same

Abstract

The present application provides a kind of low-loss transmission dense moving bed device and its operating method, including adsorption tank, regeneration tower and displacement cleaning tank, adsorption tank, regeneration tower and displacement cleaning tank use the moving bed operation mode of lower liquid inlet upper liquid outlet, and the top of at least two of adsorption tank, regeneration tower and displacement cleaning tank is provided with gas inlet, by inputting gas with pressure, for resin delivery provides downward power, and the transfer of resin is optimized from gravity discharge to gravity+power dual-action discharge, so that resin transfer delivery is stable, not easy to block;Can not need additional transport water.Additionally, resin breakage problem caused by high-speed impact, mechanical collision and other factors can be avoided from the root;Realize low-loss transmission.

Description

Technical Field

[0001] This invention relates to the field of water treatment, specifically to a dense moving bed and ion exchange resin system, and describes a low-loss transport dense moving bed device and its operation method. Background Technology

[0002] The compact moving bed can promptly remove saturated resin from the exchanger and regenerate it outside the tower, minimizing the thickness of the saturated layer and maximizing the exchange efficiency of the working layer. It also has the significant advantage of increasing the exchange rate.

[0003] The commonly used resin transfer methods in the industry are as follows: 1. Gravity flow method: This method is suitable for transporting resin from a higher to a lower position due to a height difference. During operation, interstitial water exists between the resin particles. Because interstitial water is fluid, it carries resin downwards due to gravity. However, since the wet true density of the expanded resin is only 1.07~1.1 g / ml, the settling speed is slow. Furthermore, due to the difference in fluidity between the resin and the interstitial water, the resin moves upwards relative to the interstitial water as the water flows downwards, creating a velocity difference. When the interstitial water is exhausted, the resin fluidity decreases significantly, easily accumulating and clogging the transport pipe, resulting in insufficient actual resin transfer and failing to meet the stable operation requirements of the compacted moving bed system. To maintain resin fluidity, additional transport water is required, which disrupts the system's water balance and increases energy and water consumption.

[0004] 2. Low-to-high transport: This method primarily uses transfer pumps or ejectors. Transfer pumps can compress the resin, causing it to break down. When using an ejector, a water pump provides pressure to the hydraulic ejector, with water entering through the inlet and resin being drawn in through the negative pressure suction port. The mixture of water and resin is discharged through the outlet. However, this method also has the following problems: a) The high outlet pressure of the water pump results in a high flow velocity at the ejector throat, easily causing resin breakage. b) Poor resin flowability can lead to blockages in the ejector suction line. c) High water consumption, resulting in high energy and water consumption.

[0005] Therefore, there is an urgent need to design a low-loss, high-efficiency technology for transferring and transporting resin. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a compact moving bed device with low-loss transmission and its operating method.

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows: A low-loss, compact moving bed device includes an adsorption tank, a regeneration tower, and a displacement cleaning tank. Each of the adsorption tank, regeneration tower, and displacement cleaning tank has a liquid inlet and a discharge outlet at its bottom, and a liquid outlet and a feed inlet at its top. A filter screen is fitted at the liquid outlet. The discharge outlet of the adsorption tank is connected to the feed inlet of the regeneration tower, the discharge outlet of the regeneration tower is connected to the feed inlet of the displacement cleaning tank, and the discharge outlet of the displacement cleaning tank is connected to the feed inlet of the adsorption tank. Each of the three passages between the adsorption tank, regeneration tower, and displacement cleaning tank is equipped with a discharge valve. At least two of the adsorption tank, regeneration tower, and displacement cleaning tank have an air inlet at their top, which is used to connect to an external pressurized gas source.

[0008] Furthermore, an intake switch valve, a pressure regulating valve, and a flow meter are provided at the air inlet.

[0009] Furthermore, the discharge valve is a tubular valve.

[0010] Furthermore, the bottom of the adsorption tank, regeneration tower, and displacement cleaning tank are all inverted conical funnel structures, and the discharge port is located at the bottom of the inverted conical funnel structure.

[0011] Furthermore, the top of the adsorption tank, regeneration tower, and displacement cleaning tank are all provided with the air inlet.

[0012] Furthermore, each of the adsorption tank, regeneration tower, and displacement cleaning tank is equipped with an inlet switch valve; and / or each of the adsorption tank, regeneration tower, and displacement cleaning tank is equipped with an outlet switch valve.

[0013] Furthermore, the regeneration tower is located on one side of the adsorption tank, and the displacement cleaning tank is located above the adsorption tank.

[0014] A method for operating a compact moving bed device with low-loss transmission includes the following steps: S1, providing the above-described low-loss transport dense moving bed device, filling the adsorption tank, regeneration tower and displacement cleaning tank with adsorption resin; S2, during the operation phase, close the discharge valve and proceed to steps S21, S22, and S23: S21, Operating the adsorption tank: Raw water is introduced into the inlet of the adsorption tank. The raw water enters from the bottom of the adsorption tank and mixes with the resin inside the adsorption tank. As the liquid level rises, the resin flows upward to the upper part of the adsorption tank and is intercepted by the filter screen to form a layered resin layer. After the raw water undergoes ion exchange with the resin layer inside the adsorption tank, it flows out from the outlet of the adsorption tank. The resin layer is in a stage where the upper part is lean and the lower part is saturated in the height direction. S22, Operation of the regeneration tower: Regenerant is introduced into the inlet of the regeneration tower. The regenerant enters from the bottom of the regeneration tower and mixes with the resin inside the regeneration tower. As the liquid level rises, the resin flows upward to the upper part of the regeneration tower and is intercepted by the filter screen to form a stacked resin layer. The regenerant undergoes ion exchange with the resin layer inside the regeneration tower and then flows out from the outlet of the regeneration tower. The resin layer is in a stage of upper saturation and lower depletion in the height direction. S23, Operation of the Displacement Cleaning Tank: Displacement water is introduced into the inlet of the displacement cleaning tank. The displacement water enters from the bottom of the displacement cleaning tank and mixes with the resin inside. As the liquid level rises, the resin flows upward to the top of the displacement cleaning tank and is intercepted by the filter screen to form a layered resin layer. The displacement water mixes with the residual regenerant in the resin layer inside the displacement cleaning tank and flows out from the outlet of the displacement cleaning tank. The resin layer exhibits a stage of high concentration at the top and low concentration at the bottom in the height direction. The operations of steps S21, S22, and S23 above are not performed in any particular order; S3, the transition phase, includes the following steps: S31, among the three discharge valves, at least one discharge valve is kept closed, and the remaining discharge valves are opened. In the three tanks / towers of adsorption tank, regeneration tower and displacement cleaning tank, pressurized gas is introduced from the air inlet of the first tank / tower with the currently opened passage. The pressurized gas applies pressure to the resin layer and transfers the resin in the previous tank / tower to the next tank / tower. S32. After completing step S31, switch the open / closed state of the discharge valves of the three channels, and introduce pressurized gas from the air inlet of the first tank / tower of the currently open channel. The pressurized gas applies pressure to the resin layer and transfers the resin in the previous tank / tower to the next tank / tower. Finally, the saturated resin at the bottom of the adsorption tank is transferred to the top of the regeneration tower, the lean resin at the bottom of the regeneration tower is transferred to the top of the displacement cleaning tank, and the lean resin at the bottom of the displacement cleaning tank after displacement cleaning is transferred to the top of the adsorption tank. S4, repeat steps S2 and S3.

[0015] Furthermore, after step S31 or S32 is completed, the tank / tower that has completed the transfer enters step S2, so that steps S2 and S3 are run alternately in the three tanks / towers.

[0016] Furthermore, the air inlet is provided at the top of the regeneration tower and the displacement cleaning tank; the transfer operation of the adsorption tank, regeneration tower and displacement cleaning tank is carried out in the following steps S31 and S32, specifically: S31, open the discharge valve of the passage between the adsorption tank and the regeneration tower and open the discharge valve of the passage between the displacement cleaning tank and the adsorption tank; pressurized gas is introduced into the air inlet of the displacement cleaning tank to transfer the saturated resin in the lower part of the adsorption tank to the upper part of the regeneration tower, and to transfer the lean resin in the lower part of the displacement cleaning tank after displacement cleaning to the upper part of the adsorption tank. S32, after the transfer in step S31 is completed, close the discharge valve of the passage between the adsorption tank and the regeneration tower and close the discharge valve of the passage between the displacement cleaning tank and the adsorption tank, and then proceed to steps S21 and S23; open the discharge valve of the passage between the regeneration tower and the displacement cleaning tank, pressurized gas is introduced into the air inlet of the regeneration tower, and the lean resin in the lower part of the regeneration tower is transferred to the upper part of the displacement cleaning tank. After the transfer is completed, close the discharge valve between the regeneration tower and the displacement cleaning tank, and then proceed to step S22.

[0017] Furthermore, the air inlet opens before the discharge valve, allowing pressurized gas to be introduced and then pressurized.

[0018] The technical solution provided by this invention has the following beneficial effects: 1. The adsorption tank, regeneration tower, and displacement cleaning tank adopt a moving bed operation mode of "bottom inlet, top outlet," which has the advantages of high mass transfer efficiency, high resin exchange and adsorption capacity, and good regeneration and cleaning effects. The resin concentration in the tank exhibits a significant gradient along the vertical direction (height direction). The resin in the lower part is dispersed and loose, possessing excellent flowability, which effectively prevents resin from accumulating in the delivery pipe and causing blockage during the transfer process.

[0019] 2. Building upon point 1 above, air inlets are installed at the top of at least two of the adsorption tank, regeneration tower, and displacement cleaning tank. Pressurized gas is then introduced to power the resin transport, optimizing the resin transfer from gravity discharge to a combined gravity and power discharge. This ensures stable resin transfer and prevents blockages, eliminating the need for additional water. Furthermore, it prevents resin breakage caused by high-speed impacts and mechanical collisions, achieving low-loss transport. Attached Figure Description

[0020] Figure 1 The diagram shown is a structural schematic of the compact moving bed device with low-loss transmission in the embodiment. Detailed Implementation

[0021] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] In the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 invention.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] Example 1 Reference Figure 1 As shown, this embodiment provides a low-loss transmission compact moving bed device, including an adsorption tank 10, a regeneration tower 20, and a displacement cleaning tank 30. The adsorption tank 10, the regeneration tower 20, and the displacement cleaning tank 30 are all provided with an inlet 1 and an outlet 4 at the bottom, and an outlet 2 and an inlet 3 at the top. A filter screen 9 is fitted at the outlet 2. Specifically, for ease of explanation, in this embodiment, the inlet 1, outlet 4, outlet 2, and inlet 3 of the adsorption tank 10 are respectively defined as the raw water inlet 11, the adsorption tank outlet 14, the product water outlet 12, and the adsorption tank inlet 13; the inlet 1, outlet 4, outlet 2, and inlet 3 of the regeneration tower 20 are respectively defined as the regenerant inlet 21, the regeneration tower outlet 24, the regeneration waste liquid outlet 22, and the regeneration tower inlet 23; and the inlet 1, outlet 4, outlet 2, and inlet 3 of the displacement cleaning tank 30 are respectively defined as the displacement water inlet 31, the cleaning tank outlet 34, the displacement waste water outlet 32, and the cleaning tank inlet 33.

[0025] The adsorption tank 10, regeneration tower 20 and displacement cleaning tank 30 are all equipped with inlet valves 5 at their inlets 1; and the adsorption tank 10, regeneration tower 20 and displacement cleaning tank 30 are all equipped with outlet valves 6 at their outlets 2. In this embodiment, a first inlet valve 15 is provided at the raw water inlet 11, a second inlet valve 25 is provided at the regenerant inlet 21, and a third inlet valve 35 is provided at the displacement water inlet 31; a first outlet valve 16 is provided at the product water outlet 12, a second outlet valve 26 is provided at the regeneration wastewater outlet 22, and a third outlet valve 36 is provided at the displacement wastewater outlet 32.

[0026] The top of the inner cavity of the adsorption tank 10, the regeneration tower 20 and the displacement cleaning tank 30 are all equipped with the filter screen 9. The function of the filter screen 9 is to intercept the resin 100 and prevent the resin 100 from flowing out from the corresponding outlet 2.

[0027] Specifically, the outlet 14 of the adsorption tank is connected to the inlet 23 of the regeneration tower, forming a passage between the adsorption tank 10 and the regeneration tower 20 (defined as a first passage); the outlet 24 of the regeneration tower is connected to the inlet 33 of the cleaning tank, forming a passage between the regeneration tower 20 and the displacement cleaning tank 30 (defined as a second passage); the outlet 34 of the cleaning tank is connected to the inlet 13 of the adsorption tank, forming a passage between the displacement cleaning tank 30 and the adsorption tank 10 (defined as a third passage); the inlet 3 refers to the inlet for feeding materials, and the outlet 4 refers to the inlet for discharging materials. The above connection relationship has defined the direction of material flow as a cycle from the adsorption tank 10 to the regeneration tower 20, then from the regeneration tower 20 to the displacement cleaning tank 30, and finally from the displacement cleaning tank 30 back to the adsorption tank 10.

[0028] The three passages (the first, second, and third passages) between the adsorption tank 10, the regeneration tower 20, and the displacement cleaning tank 30 are all equipped with discharge valves 7. In this embodiment, the first passage is equipped with a first discharge valve 17, specifically located at the adsorption tank outlet 14; the second passage is equipped with a second discharge valve 27, specifically located at the regeneration tower outlet 24; and the third passage is equipped with a third discharge valve 37, specifically located at the cleaning tank outlet 34. Alternatively, the discharge valves 7 can also be located at the corresponding inlet 3 or at the pipe connecting the outlet 4 and the inlet 3.

[0029] At least two of the adsorption tank 10, regeneration tower 20, and displacement cleaning tank 30 are provided with air inlets 8 at their tops. In this embodiment, one air inlet 8 is provided at the top of each of the regeneration tower 20 and the displacement cleaning tank 30, while the adsorption tank 10 is not provided with an air inlet 8. This air inlet 8 is used to connect to an external pressurized gas source (such as an air pump). Simultaneously, an air inlet switch valve, a pressure regulating valve, and a flow meter are provided at both air inlets 8. For ease of explanation, the air inlet 8 at the top of the regeneration tower 20 is defined as the first air inlet 28, and the air inlet switch valve, pressure regulating valve, and flow meter at the first air inlet 28 are defined as the first air inlet switch valve 281, the first pressure regulating valve 282, and the first flow meter 283, respectively. The air inlet 8 at the top of the displacement cleaning tank 30 is defined as the second air inlet 38, and the air inlet switch valve, pressure regulating valve, and flow meter at the second air inlet 38 are defined as the second air inlet switch valve 381, the second pressure regulating valve 382, ​​and the second flow meter 383, respectively.

[0030] During production operations, this embodiment also provides a method for operating the aforementioned low-loss transmission compact moving bed device, including the following steps: S1, the adsorption tank 10, regeneration tower 20 and displacement cleaning tank 30 are filled with adsorption resin 100, specifically resin 100 that can exchange ions; the type of resin 100 can be selected according to the actual application, such as when adsorbing heavy metal ions or radiation ions, the appropriate type of resin is selected respectively; the amount selected can also be determined according to the actual situation; this is the prior art and will not be described in detail here.

[0031] S2, during operation, close discharge valve 7 and proceed to steps S21, S22, and S23: S21, Operating the adsorption tank 10: Raw water is introduced into the inlet 1 (specifically, the raw water inlet 11) of the adsorption tank 10. The raw water refers to water containing exchangeable ions. The raw water enters from the bottom of the adsorption tank 10 and mixes with the resin 100 inside the adsorption tank 10. As the liquid level rises, the resin 100 flows upward to the upper part of the adsorption tank 10 and is intercepted by the filter screen 9 to form a layered resin layer. After the raw water exchanges ions with the resin layer inside the adsorption tank 10, it flows out from the outlet 2 (specifically, the product water outlet 12) of the adsorption tank 10. The resin layer is in a stage of upper depletion and lower saturation in the height direction. Upper depletion means that the upper resin 100 adsorbs fewer ions, and lower saturation means that the lower resin 100 has reached saturation in terms of adsorbed ions.

[0032] S22, Operation of regeneration tower 20: Regenerant is introduced into the inlet 1 (specifically, regenerant inlet 21) of regeneration tower 20. The regenerant enters from the bottom of regeneration tower 20 and mixes with resin 100 inside regeneration tower 20. As the liquid level rises, resin 100 flows upward to the upper part of regeneration tower 20 and is intercepted by filter screen 9 to form a layered resin layer. After ion exchange between the regenerant and the resin layer inside regeneration tower 20, it flows out from the outlet 2 (specifically, regeneration waste liquid outlet 22) of regeneration tower 20. The resin layer is in a stage of upper saturation and lower depletion in the height direction. That is, the saturated resin at the bottom fully contacts and exchanges with the regenerant, returning to a depleted state, while the saturated resin at the top has less contact with the regenerant and is therefore still in a saturated state.

[0033] S23, Operation of Displacement Cleaning Tank 30: Displacement water is introduced into the inlet 1 (specifically, the displacement water inlet 31) of the displacement cleaning tank 30. The displacement water enters from the bottom of the displacement cleaning tank 30 and mixes with the resin 100 inside the displacement cleaning tank 30. As the liquid level rises, the resin 100 flows upward to the upper part of the displacement cleaning tank 30 and is intercepted by the filter screen 9 to form a layered resin layer. The displacement water mixes with the residual regenerant in the resin layer inside the displacement cleaning tank 30 and flows out from the outlet of the displacement cleaning tank 30. The resin layer has a high concentration at the top and a low concentration at the bottom in the height direction. The concentration refers to the residual concentration of the regenerant.

[0034] The operations of steps S21, S22 and S23 are not sequential and can be performed simultaneously or alternately. When running in the corresponding tank or tower, the corresponding discharge valve 7 should be closed. For example, when performing step S21, the first discharge valve 17 is closed; when performing step S22, the second discharge valve 27 is closed; and when performing step S23, the third discharge valve 37 is closed.

[0035] S3, the transition phase, includes the following steps: S31, among the three discharge valves 7, at least one discharge valve 7 is kept closed, and the remaining discharge valves 7 are opened. In the three tanks / towers of adsorption tank 10, regeneration tower 20 and displacement cleaning tank 30, pressurized gas is introduced from the air inlet 8 of the first tank / tower with the currently opened passage. The pressurized gas applies pressure to the resin layer and transfers the resin 100 in the first tank / tower with the opened passage to the next tank / tower.

[0036] Specifically, three tanks / towers refer to the adsorption tank 10, the regeneration tower 20, and the displacement cleaning tank 30; one tank / tower refers to one of the adsorption tank 10, the regeneration tower 20, and the displacement cleaning tank 30; and two tanks / towers refer to two of the adsorption tank 10, the regeneration tower 20, and the displacement cleaning tank 30.

[0037] In this embodiment, S31 keeps the second discharge valve 27 of the second passage closed, and opens the remaining discharge valves 7 (i.e., the first discharge valve 17 and the third discharge valve 37), so that the third passage and the first passage are open, that is, the displacement cleaning tank 30, the adsorption tank 10 and the regeneration tower 20 are connected in sequence, and the regeneration tower 20 and the displacement cleaning tank 30 are kept closed; pressurized gas is introduced from the second air inlet 38 of the first tank / tower (the displacement cleaning tank 30) of the currently open passage (the open third passage and the first passage), and the pressurized gas applies pressure to the resin layer in the displacement cleaning tank 30, transferring the resin 100 in the previous tank / tower to the next tank / tower, that is, transferring the lean resin 100 that has been replaced and cleaned in the lower part of the displacement cleaning tank 30 to the upper part of the adsorption tank 10, and transferring the saturated resin 100 in the lower part of the adsorption tank 10 to the upper part of the regeneration tower 20.

[0038] In this step, the transfer of the lean resin 100 cleaned at the bottom of the replacement cleaning tank 30 to the top of the adsorption tank 10 and the transfer of the saturated resin 100 at the bottom of the adsorption tank 10 to the top of the regeneration tower 20 are carried out synchronously; this ensures that the amount of resin discharged from the adsorption tank 10 is equivalent to the amount of resin replenished, reducing the problem of high failure rate of step-by-step conveying.

[0039] Specifically, the first tank / tower in the currently open passage mentioned above refers to the tank / tower located at the very beginning of the passage. For example, in S31, both the third and first passages are open, meaning the displacement cleaning tank 30, adsorption tank 10, and regeneration tower 20 are connected in sequence. The tank / tower located at the very beginning of this passage is the displacement cleaning tank 30. The preceding tank / tower and the next tank / tower are relative to each other according to the flow direction. For example, in the connected displacement cleaning tank 30 and adsorption tank 10, the preceding tank / tower is the displacement cleaning tank 30, and the next tank / tower is the adsorption tank 10; in the connected adsorption tank 10 and regeneration tower 20, the preceding tank / tower is the adsorption tank 10, and the next tank / tower is the regeneration tower 20; and so on. Related descriptions in other positions in this article will not be explained further.

[0040] S32, After completing step S31, switch the open / closed states of the discharge valves 7 in the three channels, that is, switch the first discharge valve 17 and the third discharge valve 37 from the open state to the closed state, and switch the second discharge valve 27 from the closed state to the open state, opening the second channel, so that the regeneration tower 20 and the displacement cleaning tank 30 are connected, while the third channel and the first channel are closed. Pressurized gas is introduced into the air inlet 8 of the first tank / tower of the currently opened channel, that is, pressurized gas is introduced into the first air inlet 28 of the regeneration tower 20. The pressurized gas applies downward pressure to the resin layer in the regeneration tower 20, transferring the resin in the previous tank / tower to the next tank / tower, that is, transferring the lean resin 100 in the lower part of the regeneration tower 20 to the upper part of the displacement cleaning tank 30.

[0041] The above process is divided into two steps (i.e., step S31 or S32) to complete the cycle of the three tanks / towers. Finally, the saturated resin 100 at the bottom of the adsorption tank 10 is transferred to the top of the regeneration tower 20, the lean resin 100 at the bottom of the regeneration tower 20 is transferred to the top of the displacement cleaning tank 30, and the lean resin 100 at the bottom of the displacement cleaning tank 30 after displacement cleaning is transferred to the top of the adsorption tank 10.

[0042] Specifically, during the transfer phase of step S3, at least one discharge valve 7 needs to be kept closed so that when pressurized gas is introduced, the introduced gas can be pressurized and eventually pressurized in one direction.

[0043] Specifically, when the adsorption tank 10, regeneration tower 20, or displacement cleaning tank 30 moves from the operation stage of step S2 to the transfer stage of step S3, the inlet 1 and outlet 2 of the tank / tower are closed. For example, when the adsorption tank 10 moves from the operation stage of step S2 to the transfer stage of step S3, the raw water inlet 11 and the product water outlet 12 are closed, and so on.

[0044] S4, repeat steps S2 and S3 to perform a cyclical process. Preferably, after step S31 or S32 is completed, the tank / tower that has completed the transfer enters step S2; as in this embodiment, when entering step S31, since the resin 100 in the regeneration tower 20 does not need to be transferred to the displacement cleaning tank 30, step S22 can be performed in the regeneration tower 20; when entering step S32, the resin in the adsorption tank 10 and the displacement cleaning tank 30 has completed the transfer, and steps S21 and S23 can be performed immediately to improve efficiency. Of course, in other embodiments, after step S3 is completed, all three tanks / towers can enter step S2 together, and then enter step S3 together.

[0045] The scheme of this application employs a moving bed operation mode of "bottom inlet, top outlet," in which the adsorption tank 10, regeneration tower 20, and displacement cleaning tank 30 operate. This mode offers advantages such as high mass transfer efficiency, high exchange adsorption capacity of resin 100, and good regeneration and cleaning effects. The concentration of the resin layer exhibits a significant gradient along the height (longitudinal) of the tank. The resin 100 in the lower part is dispersed and loose, possessing excellent fluidity. This effectively prevents the resin 100 from accumulating in the delivery pipe and causing blockages during the transfer process.

[0046] Furthermore, air inlets 8 are installed at the top of at least two of the adsorption tank 10, regeneration tower 20, and displacement cleaning tank 30. Pressurized gas is input to power the transport of resin 100. The transfer of resin 100 is optimized from gravity discharge to a dual-action discharge of gravity and power, making the transfer and transport of resin 100 stable and less prone to clogging; no additional water is needed for transport. Simultaneously, resin breakage caused by high-speed impacts, mechanical collisions, etc., can be avoided at the source, achieving low-loss transmission.

[0047] Furthermore, in this embodiment, when entering step S3, the air inlet 8 opens before the discharge valve 7, allowing pressurized gas to be introduced and then pressurized. For example, when entering step S31, the second air outlet 38 opens earlier than the third discharge valve 37. In this way, the pressurized gas is introduced earlier and pressurized at the top of the replacement cleaning tank 30, allowing the gas pressure to be stably increased to the preset value, resulting in better performance. Of course, in other embodiments, if the pressure of the introduced pressurized gas is sufficient, the opening times of the air inlet 8 and the discharge valve 7 can also be synchronized.

[0048] Specifically, in this embodiment, the design of the air inlet switch valve, pressure regulating valve, and flow meter at the air inlet 8 is as follows: the air inlet switch valve is used to open or close the air inlet, the pressure regulating valve is used to regulate the incoming air pressure, and the flow meter displays the current flow rate. With this configuration, the resin conveying speed can be precisely controlled by adjusting the pressure of the pressurized gas on the conveyor belt, thereby improving the overall operating efficiency of the device. At the same time, the single resin conveying volume and the total conveying volume can be accurately controlled, effectively improving the resin utilization rate.

[0049] Specifically, in this embodiment, the discharge valve 7 is a tube valve, and the part of the tube valve that contacts the resin 100 is an elastic sleeve. The flow is cut off by squeezing the sleeve with air pressure, which ensures the interception effect while avoiding resin breakage due to squeezing; further reducing the breakage of the resin 100.

[0050] Specifically, in this embodiment, the bottom of the adsorption tank 10, the regeneration tower 20 and the displacement cleaning tank 30 are all inverted conical funnel structures, and the discharge port 4 is located at the bottom of the inverted conical funnel structure. In this way, the resin 100 can be better guided out and the transfer efficiency can be faster.

[0051] Specifically, in this embodiment, the regeneration tower 20 is arranged on one side of the adsorption tank 10, that is, the adsorption tank 10 and the regeneration tower 20 are arranged side by side. Since the regeneration tower 20 is relatively high, in this embodiment, the displacement cleaning tank 30 is arranged above the adsorption tank 10. This can reduce the height difference between the top of the displacement cleaning tank 30 and the top of the regeneration tower 20, and reduce the energy consumption of transportation. Preferably, the top of the displacement cleaning tank 30 is at the same height as the top of the regeneration tower 20.

[0052] Example 2 This embodiment provides a low-loss transfer compact moving bed device, which is structurally similar to that of Embodiment 1, except that: in this embodiment, air inlets 8 are provided at the top of the three tanks / towers, namely the adsorption tank 10, the regeneration tower 20, and the displacement cleaning tank 30. This allows for selection of the transfer steps according to actual conditions. Specifically, in the operation method of the low-loss transfer compact moving bed device provided in this application, in step S31, the first and second passages are first opened, and pressurized gas is introduced into the air inlet (not shown) at the top of the adsorption tank 10 to drive the transfer of saturated resin 100 at the bottom of the adsorption tank 10 to the top of the regeneration tower 20, and the transfer of lean resin 100 at the bottom of the regeneration tower 20 to the top of the displacement cleaning tank 30. Then, the process is switched, i.e., in step S32, the third passage is opened separately, and pressurized gas is introduced into the air inlet 8 (i.e., the second air inlet 38) at the top of the displacement cleaning tank 30 to drive the transfer of the lean resin 100 at the bottom of the displacement cleaning tank 30 after displacement cleaning to the top of the adsorption tank 10.

[0053] Alternatively, in step S31, the first passage can be opened first, and pressurized gas can be introduced into the air inlet at the top of the adsorption tank 10 to drive the transfer of the saturated resin 100 at the bottom of the adsorption tank 10 to the top of the regeneration tower 20; then, in step S32, the second and third passages can be opened, and pressurized gas can be introduced into the air inlet 8 (i.e., the first air inlet 28) at the top of the regeneration tower 20 to drive the transfer of the lean resin 100 at the bottom of the regeneration tower 20 to the top of the replacement cleaning tank 30, and the lean resin 100 at the bottom of the replacement cleaning tank 30 after replacement cleaning can be transferred to the top of the adsorption tank 10; and so on.

[0054] However, among the operating methods of step S3, the operating method of Example 1 is the most preferred.

[0055] Of course, in other embodiments, air inlets may be provided in any two of the adsorption tank 10, regeneration tower 20 and displacement cleaning tank 30.

[0056] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A low-loss conveying compact moving bed device, comprising an adsorption tank, a regeneration tower, and a displacement washing tank, wherein the adsorption tank, regeneration tower, and displacement washing tank are each provided with an inlet and an outlet at the bottom, and an outlet and an inlet at the top, wherein a filter screen is fitted at the outlet; characterized in that: The outlet of the adsorption tank is connected to the inlet of the regeneration tower, the outlet of the regeneration tower is connected to the inlet of the displacement cleaning tank, and the outlet of the displacement cleaning tank is connected to the inlet of the adsorption tank. Each of the three passages between the adsorption tank, the regeneration tower, and the displacement cleaning tank is equipped with a discharge valve. At least two of the adsorption tank, the regeneration tower, and the displacement cleaning tank are provided with an air inlet at their tops. The air inlets are used to connect to an external pressurized gas source.

2. The low-loss transmission compact moving bed device according to claim 1, characterized in that: An intake switch valve, a pressure regulating valve, and a flow meter are installed at the air inlet.

3. The low-loss transmission compact moving bed device according to claim 1, characterized in that: The discharge valve is a tubular valve.

4. The low-loss transmission compact moving bed device according to claim 1, characterized in that: The bottom of the adsorption tank, regeneration tower, and displacement cleaning tank are all inverted conical funnel structures, and the discharge port is located at the bottom of the inverted conical funnel structure.

5. The low-loss transmission compact moving bed device according to claim 1, characterized in that: The adsorption tank, regeneration tower, and displacement cleaning tank are all equipped with inlet valves; and / or the adsorption tank, regeneration tower, and displacement cleaning tank are all equipped with outlet valves.

6. The low-loss transmission compact moving bed device according to claim 1, characterized in that: The regeneration tower is located on one side of the adsorption tank, and the displacement cleaning tank is located above the adsorption tank.

7. A method for operating a compact moving bed device with low-loss transmission, characterized in that, Includes the following steps: S1, providing a compact moving bed apparatus for low-loss transport as described in any one of claims 1 to 6, wherein the adsorption tank, regeneration tower and displacement washing tank are filled with resin for adsorption. S2, during the operation phase, close the discharge valve and proceed to steps S21, S22, and S23: S21, Operating the adsorption tank: Raw water is introduced into the inlet of the adsorption tank. The raw water enters from the bottom of the adsorption tank and mixes with the resin inside the adsorption tank. As the liquid level rises, the resin flows upward to the upper part of the adsorption tank and is intercepted by the filter screen to form a layered resin layer. After the raw water undergoes ion exchange with the resin layer inside the adsorption tank, it flows out from the outlet of the adsorption tank. The resin layer is in a stage where the upper part is lean and the lower part is saturated in the height direction. S22, Operation of the regeneration tower: Regenerant is introduced into the inlet of the regeneration tower. The regenerant enters from the bottom of the regeneration tower and mixes with the resin inside the regeneration tower. As the liquid level rises, the resin flows upward to the upper part of the regeneration tower and is intercepted by the filter screen to form a stacked resin layer. The regenerant undergoes ion exchange with the resin layer inside the regeneration tower and then flows out from the outlet of the regeneration tower. The resin layer is in a stage of upper saturation and lower depletion in the height direction. S23, Operation of the Displacement Cleaning Tank: Displacement water is introduced into the inlet of the displacement cleaning tank. The displacement water enters from the bottom of the displacement cleaning tank and mixes with the resin inside. As the liquid level rises, the resin flows upward to the top of the displacement cleaning tank and is intercepted by the filter screen to form a layered resin layer. The displacement water mixes with the residual regenerant in the resin layer inside the displacement cleaning tank and flows out from the outlet of the displacement cleaning tank. The resin layer exhibits a stage of high concentration at the top and low concentration at the bottom in the height direction. The operations of steps S21, S22, and S23 above are not performed in any particular order; S3, the transition phase, includes the following steps: S31, among the three discharge valves, at least one discharge valve is kept closed, and the remaining discharge valves are opened. In the three tanks / towers of adsorption tank, regeneration tower and displacement cleaning tank, pressurized gas is introduced from the air inlet of the first tank / tower with the currently opened passage. The pressurized gas applies pressure to the resin layer and transfers the resin in the previous tank / tower to the next tank / tower. S32. After completing step S31, switch the open / closed state of the discharge valves of the three channels, and introduce pressurized gas from the air inlet of the first tank / tower of the currently open channel. The pressurized gas applies pressure to the resin layer and transfers the resin in the previous tank / tower to the next tank / tower. Finally, the saturated resin at the bottom of the adsorption tank is transferred to the top of the regeneration tower, the lean resin at the bottom of the regeneration tower is transferred to the top of the displacement cleaning tank, and the lean resin at the bottom of the displacement cleaning tank after displacement cleaning is transferred to the top of the adsorption tank. S4, repeat steps S2 and S3.

8. The method of operating the low-loss transmission compact moving bed device according to claim 7, characterized in that: The air inlet is provided at least at the top of the regeneration tower and the displacement cleaning tank; the transfer operation of the adsorption tank, regeneration tower and displacement cleaning tank is carried out in the following steps S31 and S32, specifically: S31, open the discharge valve of the passage between the adsorption tank and the regeneration tower and open the discharge valve of the passage between the displacement cleaning tank and the adsorption tank; pressurized gas is introduced into the air inlet of the displacement cleaning tank to transfer the saturated resin in the lower part of the adsorption tank to the upper part of the regeneration tower, and to transfer the lean resin in the lower part of the displacement cleaning tank after displacement cleaning to the upper part of the adsorption tank. S32, after the transfer in step S31 is completed, close the discharge valve of the passage between the adsorption tank and the regeneration tower and close the discharge valve of the passage between the displacement cleaning tank and the adsorption tank, and then proceed to steps S21 and S23; open the discharge valve of the passage between the regeneration tower and the displacement cleaning tank, pressurized gas is introduced into the air inlet of the regeneration tower, and the lean resin in the lower part of the regeneration tower is transferred to the upper part of the displacement cleaning tank. After the transfer is completed, close the discharge valve between the regeneration tower and the displacement cleaning tank, and then proceed to step S22.

9. The operating method of the low-loss transmission compact moving bed device according to claim 7, characterized in that: wherein, Once step S31 or S32 is completed, the tank / tower that has been transferred enters step S2, so that steps S2 and S3 are run alternately in the three tanks / towers.

10. The method of operating the low-loss transmission compact moving bed device according to claim 7, characterized in that: The air inlet opens before the discharge valve, allowing pressurized gas to enter and then be pressurized.

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