Saline water refining system capable of reducing resin breakage

Abstract

The utility model provides a salt water refining system capable of reducing resin breakage, which comprises a salt water heat exchanger, a salt water filtering tank, a salt water filtering pump, a resin tower, a refined salt water filter, an online detector and a head tank which are connected in sequence, a filtered saline water heat exchanger is arranged at an inlet of a filtered saline water tank, high-temperature dechlorinated saline water is used as a heat exchange medium, it is guaranteed that the saline water temperature is the optimal working temperature of resin, and the heat energy utilization rate is increased; an on-line detector is arranged for real-time monitoring, so that the regeneration frequency of the resin tower is reduced, and resin breakage caused by volume shrinkage and expansion due to resin regeneration is reduced; a frequency converter, a brine feeding valve and a head tank liquid level meter arranged on the filtering brine pump are in interlocking control, the system pressure and the head tank liquid level are guaranteed, and the system is high in automation degree and easy to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of chlor-alkali production, and in particular relates to a brine refining system for reducing resin breakage. Background Art

[0002] In the production of chlor-alkali industry, the concentration determination of calcium and magnesium ions in refined brine is a very important link. When the brine passes through the ion exchange resin tower, most of the metal ions such as calcium, magnesium, strontium in the brine are adsorbed by the ion exchange resin, thereby achieving the purpose of ion exchange refining. As the operation time of the resin tower increases and the resin particles break due to various reasons, the overall exchange capacity of the ion exchange resin tower decreases.

[0003] When the exchange and adsorption capacity of the chelating resin gradually decreases and cannot meet the process requirements, the resin tower needs to be regenerated. Regeneration uses hydrochloric acid and caustic soda solution to regenerate to the original state through ion exchange reaction. The regeneration of ion exchange resin can be divided into acid regeneration: through reaction with hydrochloric acid, the resin is converted to hydrogen type, and the resin volume shrinks by 40%; alkali adjustment: through reaction with alkali, the resin is converted back to sodium type to restore normal state, and the resin volume also expands to the original volume. During each regeneration process of the resin, due to the shrinkage and expansion of the resin volume, part of the resin will break. According to statistics, for every 200 regenerations, the resin will break about (5-10)%; when the free chlorine in the brine exceeds the standard, it will also cause the ion exchange resin to break. Free chlorine has strong oxidizing properties, which will cause irreparable damage to the ion exchange resin. Therefore, during operation, special attention should be paid to the control of the free chlorine content in the brine. When regenerating the ion exchange resin tower, ensure that the free chlorine content of the hydrochloric acid used for regeneration is zero; the pressure difference of the resin tower is too large. If the operating pressure of the resin tower is high and the pressure difference before and after is large during the operation of the resin tower, the amount of chelating resin breakage will increase. Broken resin particles were found when sampling and analyzing the brine at the resin tower outlet. These broken resin particles will cause the resin filter to be blocked after entering the resin filter of the resin tower outlet main pipe, and the liquid level of the brine high-level tank will be insufficient. In severe cases, there may be a risk of abnormal shutdown due to insufficient brine flow into the electrolytic cell. Utility Model Content

[0004] The utility model aims to overcome the high resin breakage rate of the resin tower caused by the above-mentioned various reasons, the blockage of the resin filter caused by the broken resin particles entering the resin filter of the resin tower outlet main pipe, the insufficient liquid level of the brine high-level tank, and the risk of abnormal shutdown due to insufficient brine flow into the electrolytic cell in severe cases, and provides a brine refining system that reduces resin breakage, ensures that the brine temperature is at the optimal working temperature of the resin, improves the thermal energy utilization rate, has a high degree of automation and is easy to operate.

[0005] In order to achieve the above-mentioned purpose of the utility model, the following technical solutions are adopted:

[0006] A brine refining system for reducing resin breakage comprises a brine heat exchanger, a brine filtering tank, a brine filtering pump, a resin tower, a brine filter, an online detector and a high-level tank connected in sequence, wherein the resin tower is respectively connected to a resin collector, a brine recovery tank and a neutralization tank; the resin tower comprises a resin tower a, a resin tower b and a resin tower c, wherein the resin tower a is connected to a first feed pipe provided with a first feed valve and a first regeneration pipe at the top, a first displacement pipe provided with a first displacement valve at the top, and a first discharge pipe at the bottom, wherein the first discharge pipe is provided with a first sampling pipe, a first connecting pipe, a first recovery pipe and a first discharge valve in sequence, the resin tower b is connected to a second feed pipe provided with a second feed valve and a second regeneration pipe at the top, a second displacement pipe provided with a second displacement valve at the top, and a second discharge pipe at the bottom, wherein the second discharge pipe is provided with a second sampling pipe, a second connecting pipe, a second recovery pipe and a second discharge valve in sequence, the resin tower c is connected to a third feed pipe provided with a third feed valve and a third regeneration pipe at the top, a third displacement pipe provided with a third displacement valve at the top, and a third discharge pipe at the bottom. , the third discharge pipe is provided with a third sampling pipe, a third connecting pipe, a third recovery pipe and a third discharge valve in sequence; the first discharge pipe, the second discharge pipe and the third discharge pipe, which are respectively provided with the first discharge valve, the second discharge valve and the third discharge valve, are collected into the discharge main pipe and are connected to the refined brine filter and the high-level tank in sequence; the first recovery pipe, the second recovery pipe and the third recovery pipe, which are respectively provided with the first recovery valve, the second recovery valve and the third recovery valve, are collected and connected to the recovery brine tank through the recovery valve; the first sampling pipe, the second sampling pipe and the third sampling pipe, which are respectively provided with the first sampling valve, the second sampling valve and the third sampling valve, are collected and connected to the neutralization tank and the online detector respectively, and the other end of the online analyzer is connected to the discharge main pipe; the first displacement pipe, the second displacement pipe and the third displacement pipe are collected and connected to the resin trap and the recovery brine tank in sequence; the first discharge pipe is connected to the second feed pipe through the first connecting pipe provided with the first connecting valve, the second discharge pipe is connected to the third feed pipe through the second connecting pipe provided with the second connecting valve, and the third discharge pipe is connected to the first feed pipe through the third connecting pipe provided with the third connecting valve.

[0007] Furthermore, one end of the regeneration pipe is respectively connected to a first regeneration pipe provided with a first regeneration valve, a second regeneration pipe provided with a second regeneration valve, and a third regeneration pipe provided with a third regeneration valve, and the other end is respectively connected to a pure water pipe provided with a pure water valve, an alkali pipe provided with an alkali valve, and an acid pipe provided with an acid valve, and the pure water pipe is connected to a recovery pipe via a backwash pipe provided with a backwash valve; one end of a brine replacement pipe provided with a brine replacement valve is connected to a discharge main pipe, and the other end is connected to an acid-base recovery pipe provided with an acid-base recovery valve, and the acid-base recovery pipe is connected to a neutralization tank.

[0008] Furthermore, the brine heat exchanger is connected with a heat exchange upper water pipe and a heat exchange return water pipe, and at least one is provided. The filtered brine pump is provided with a frequency converter, and the frequency converter, the brine feed valve and the high-level tank level gauge are electrically connected.

[0009] Furthermore, the neutralization tank is provided with a neutralization water pump, a water diversion tank, a stirrer, a pH meter I, a pH meter II and a neutralization tank level gauge, and the outlet of the neutralization water pump is connected to a salt water recovery tank.

[0010] Furthermore, the high-level tank is provided with a high-level tank liquid level gauge and a high-level tank overflow pipe, the high-level tank liquid level gauge is electrically connected to the brine feed valve, and the high-level tank overflow pipe is connected to the filtered brine tank.

[0011] Furthermore, a drain valve is provided at the bottom of the refined brine filter.

[0012] Furthermore, a water filter cap, a water filter cap fixing plate and a lower sieve plate are arranged at the bottom of the resin tower. The water filter cap is evenly fixed on the water filter cap fixing plate, and the water filter cap fixing plate is fixedly connected to the lower sieve plate by bolts.

[0013] The beneficial effects of the utility model are as follows: the utility model provides a brine refining system for reducing resin breakage, a brine filter heat exchanger arranged at the inlet of the brine filter tank, and high-temperature dechlorinated brine as a heat exchange medium to ensure that the brine temperature is at the optimal working temperature of the resin while improving the thermal energy utilization rate; the acid and alkali liquid after regeneration is neutralized and reused to improve resource utilization rate; the online detector is arranged to monitor the brine in real time, extend the regeneration cycle of the resin tower, improve the resin utilization rate, reduce the regeneration frequency of the resin, and reduce the resin breakage caused by volume shrinkage and expansion due to resin regeneration; a drain valve is arranged at the bottom of the refined brine filter for timely inspection and cleaning. If a large amount of broken resin accumulates during operation, the pressure difference of the refined brine filter increases, thereby ensuring the system operating pressure; the frequency converter, brine feed valve and high-level tank liquid level gauge arranged on the filtered brine pump are interlocked and controlled to ensure the system pressure and the high-level tank liquid level. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 This is the internal structure diagram of the resin tower.

[0016] In the figure: 1. brine heat exchanger; 11. heat exchange upper water pipe; 12. heat exchange return water pipe; 2. filtered brine tank; 3. filtered brine pump; 31 inverter; 32 brine feed valve; 4. resin tower; 4-1. filter water cap; 4-2. filter water cap fixing plate; 4-3. lower sieve plate; 4a. resin tower a; 4b. resin tower b; 4c. resin tower c; 41a. first feed pipe; 41b. second feed pipe; 41c. third feed pipe; 41a1. first feed valve; 41b1. second feed valve; 41c1. third Feed valve; 42. Discharge main pipe; 42a. First discharge pipe; 42b. Second discharge pipe; 42c. Third discharge pipe; 42a1. First discharge valve; 42b1. Second discharge valve; 42c1. Third discharge valve; 43a. First displacement pipe; 43b. Second displacement pipe; 43c. Third displacement pipe; 43a1. First displacement valve; 43b1. Second displacement valve; 43c1. Third displacement valve; 44a. First connecting pipe; 44b. Second connecting pipe; 44c. Third connecting pipe; 44a1. First connecting valve ; 44b1. second connecting valve; 44c1. third connecting valve; 45. recovery pipe; 451. recovery valve; 45a. first recovery pipe; 45b. second recovery pipe; 45c. third recovery pipe; 45a1. first recovery valve; 45b1. second recovery valve; 45c1. third recovery valve; 46. sampling liquid recovery pipe; 46a. first sampling pipe; 46b. second sampling pipe; 46c. third sampling pipe; 46a1. first sampling valve; 46b1. second sampling valve; 46c1. third sampling valve; 47. reverse Flushing pipe; 47a. Backwashing valve; 48. Regeneration pipe; 48a. First regeneration pipe; 48b. Second regeneration pipe; 48c. Third regeneration pipe; 48a1. First regeneration valve; 48b1. Second regeneration valve; 48c1. Third regeneration valve; 48d. Pure water pipe; 48e. Alkali pipe; 48f. Acid pipe; 48d1. Pure water valve; 48e1. Alkali valve; 48f1. Acid valve; 49. Brine replacement pipe; 49a. Brine replacement valve; 410. Acid and alkali recovery pipe; 410a. Acid and alkali recovery valve; 5. Resin trap; 6. Recovery brine tank; 7. Neutralization tank; 71. Neutralization pump; 72. Water diversion tank; 73. Agitation; 74. PH meter I; 75. PH meter II; 76. Neutralization tank level gauge; 8. Online detector; 81. Detection control valve; 9. Brine filter; 91. Drain valve; 10. High-level tank; 101. High-level tank level gauge; 102. High-level tank overflow pipe. DETAILED DESCRIPTION

[0017] In order to make the technical solution of the utility model more clearly and accurately understood by those skilled in the art, the following is a detailed explanation in the form of embodiments. Obviously, the drawings described below are some embodiments of the utility model, and for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Example

[0018] Reference Figure 1As shown, the utility model provides a brine refining system for reducing resin breakage, comprising a brine heat exchanger 1, a filtered brine tank 2, a filtered brine pump 3, a resin tower 4, a refined brine filter 9, an online detector 8 and a high-level tank 10 connected in sequence, the resin tower 4 is respectively connected to a resin collector 5, a recovered brine tank 6 and a neutralization tank 7; the resin tower 4 comprises a resin tower a 4a, a resin tower b 4b and a resin tower c 4c, the resin tower a 4a is connected to a first feed pipe 41a provided with a first feed valve 41a1 and a first regeneration pipe 48a at the upper part, a first displacement pipe 43a provided with a first displacement valve 43a1 at the top, and a first discharge pipe 42a is connected at the lower part, the first discharge pipe 42a is provided with a first sampling pipe 46a, a first connecting pipe 44a, a first recovery pipe 45a and a first discharge valve 42a1 in sequence, the resin tower b The upper part of 4b is connected to a second feed pipe 41b provided with a second feed valve 41b1 and a second regeneration pipe 48b, the top is connected to a second displacement pipe 43b provided with a second displacement valve 43b1, the lower part is connected to a second discharge pipe 42b, and the second discharge pipe 42b is provided with a second sampling pipe 46b, a second connecting pipe 44b, a second recovery pipe 45b and a second discharge valve 42b1 in sequence, and the resin tower c The upper part of 4c is connected to the third feed pipe 41c provided with the third feed valve 41c1 and the third regeneration pipe 48c, the top is connected to the third displacement pipe 43c provided with the third displacement valve 43c1, the lower part is connected to the third discharge pipe 42c, the third discharge pipe 42c is provided with the third sampling pipe 46c, the third connecting pipe 44c, the third recovery pipe 45c and the third discharge valve 42c1 in sequence; the first discharge pipe 42a, the second discharge pipe 42b and the third discharge pipe 42c, which are respectively provided with the first discharge valve 42a1, the second discharge valve 42b1 and the third discharge valve 42c1, are collected into the discharge main pipe 42 and are connected to the refined brine filter 9 and the high-level tank 10 in sequence; the first recovery pipe 45a, the second recovery pipe 45b and the third recovery pipe 45c, which are respectively provided with the first recovery valve 45a1, the second recovery valve 45b2 and the third recovery valve 45c3, are collected and passed through the recovery valve 451 Connected to the recovery brine tank 6; the first sampling tube 46a, the second sampling tube 46b and the third sampling tube 46c which are respectively provided with the first sampling valve 46a1, the second sampling valve 46b1 and the third sampling valve 46c1 are respectively connected to the neutralization tank 7 and the online detector 8 after being collected, and the other end of the online analyzer 8 is connected to the discharge main pipe 42; the first displacement tube 43a, the second displacement tube 43b and the third displacement tube 43c are collected and connected to the resin collector 5 and the recovery brine tank 6 in sequence; the first discharge pipe 42a is connected to the second feed pipe 41b via the first connecting tube 44a provided with the first connecting valve 44a1, the second discharge pipe 42b is connected to the third feed pipe 41c via the second connecting tube 44b provided with the second connecting valve 44b1, and the third discharge pipe 43c is connected to the first feed pipe 41a via the third connecting tube 44c provided with the third connecting valve 44c1.

[0019] Furthermore, one end of the regeneration pipe 48 is respectively connected to a first regeneration pipe 48a provided with a first regeneration valve 48a1, a second regeneration pipe 48b provided with a second regeneration valve 48b1 and a third regeneration pipe 48c provided with a third regeneration valve 48c1, and the other end is respectively connected to a pure water pipe 48d provided with a pure water valve 48d1, an alkali pipe 48e provided with an alkali valve 48e1 and an acid pipe 48f provided with an acid valve 48f, the pure water pipe 48d is connected to the recovery pipe 45 via a backwash pipe 47 provided with a backwash valve 47a; one end of a brine replacement pipe 49 provided with a brine replacement valve 49a is connected to the discharge main pipe 42, and the other end is connected to an acid-base recovery pipe 410 provided with an acid-base recovery valve 410a, and the acid-base recovery pipe 410 is connected to the neutralization tank 7.

[0020] Furthermore, the brine heat exchanger 1 is connected to a heat exchange upper water pipe 11 and a heat exchange return water pipe 12, and at least one is provided, using high-temperature dechlorinated brine as a heat exchange medium to ensure that the brine temperature is at the optimal working temperature of the resin while improving the thermal energy utilization rate.

[0021] Furthermore, the filtered brine pump 3 is provided with a frequency converter 31, and the frequency converter 31, the brine feed valve 32 and the high-level tank liquid level meter 101 are electrically connected. By adjusting the frequency converter 31, the operating pressure of the filtered brine pump 3 is controlled to keep the brine flow at the outlet of the resin tower 4 and the liquid level of the high-level tank 10 stable.

[0022] Furthermore, the neutralization tank 7 is provided with a neutralization water pump 71 , a water diversion tank 72 , a stirrer 73 , a pH meter I 74 , a pH meter II 76 and a neutralization tank level gauge 75 , and the outlet of the neutralization water pump 71 is connected to the brine recovery tank 6 .

[0023] Furthermore, the high-level tank 10 is provided with a high-level tank level gauge 101 and a high-level tank overflow pipe 102 . The high-level tank level gauge 101 is electrically connected to the brine feed valve 32 , and the high-level tank overflow pipe 102 is connected to the filtered brine tank 2 .

[0024] Furthermore, a drain valve 91 is provided at the bottom of the refined brine filter 9, which is checked and cleaned in time. If a large amount of broken resin accumulates during operation, the pressure difference of the refined brine filter increases, and the system operating pressure is ensured.

[0025] Furthermore, a water filter cap 4-1, a water filter cap fixing plate 4-2 and a lower sieve plate 4-3 are provided at the bottom of the resin tower 4, the water filter cap 4-1 is evenly fixed on the water filter cap fixing plate 4-2, and the water filter cap fixing plate 4-2 is fixedly connected to the lower sieve plate 4-3 by bolts; this structure ensures that the brine and regenerated materials in the resin tower can be well distributed, the brine is evenly distributed in the tower, the flow rate is uniform, the pressure drop of the resin tower is reduced, the residence reaction time of the brine is ensured, and the quality of the brine is up to standard and stable; the regenerated materials are evenly distributed in the tower to ensure that no deviation and short circuit occur, and the resin is fully regenerated. The water filter cap is acid and alkali resistant, and the temperature resistance can reach 110°C. It has good stability in use, long service life, uniform openings, and increased brine flow rate.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A brine refining system for reducing resin breakage, characterized in that: The invention comprises a brine heat exchanger, a brine filter tank, a brine filter pump, a resin tower, a brine filter, an online detector and a high-level tank connected in sequence, wherein the resin tower is respectively connected to a resin collector, a brine recovery tank and a neutralization tank; the resin tower comprises a resin tower a, a resin tower b and a resin tower c, wherein the upper part of the resin tower a is connected to a first feed pipe provided with a first feed valve and a first regeneration pipe, the top part is connected to a first displacement pipe provided with a first displacement valve, the lower part is connected to a first discharge pipe, the first discharge pipe is provided with a first sampling pipe, a first connecting pipe, a first recovery pipe and a first discharge valve in sequence, the upper part of the resin tower b is connected to a second feed pipe provided with a second feed valve and a second regeneration pipe, the top part is connected to a second displacement pipe provided with a second displacement valve, the lower part is connected to a second discharge pipe, the second discharge pipe is provided with a second sampling pipe, a second connecting pipe, a second recovery pipe and a second discharge valve in sequence, the upper part of the resin tower c is connected to a third feed pipe provided with a third feed valve and a third regeneration pipe, the top part is connected to a third displacement pipe provided with a third displacement valve, the lower part is connected to a third discharge pipe, the third discharge pipe The pipe is provided with a third sampling pipe, a third connecting pipe, a third recovery pipe and a third discharge valve in sequence; the first discharge pipe, the second discharge pipe and the third discharge pipe, which are respectively provided with the first discharge valve, the second discharge valve and the third discharge valve, are collected into the discharge main pipe and then connected to the refined brine filter and the high-level tank in sequence; the first recovery pipe, the second recovery pipe and the third recovery pipe, which are respectively provided with the first recovery valve, the second recovery valve and the third recovery valve, are collected and connected to the recovery brine tank through the recovery valve; the first sampling pipe, the second sampling pipe and the third sampling pipe, which are respectively provided with the first sampling valve, the second sampling valve and the third sampling valve, are collected and respectively connected to the neutralization tank and the online detector, and the other end of the online detector is connected to the discharge main pipe; the first displacement pipe, the second displacement pipe and the third displacement pipe are collected and connected to the resin collector and the recovery brine tank in sequence; the first discharge pipe is connected to the second feed pipe through the first connecting pipe provided with the first connecting valve, the second discharge pipe is connected to the third feed pipe through the second connecting pipe provided with the second connecting valve, and the third discharge pipe is connected to the first feed through the third connecting pipe provided with the third connecting valve.

2. A brine refining system for reducing resin breakage according to claim 1, characterized in that: One end of the regeneration pipe is respectively connected to the first regeneration pipe provided with a first regeneration valve, the second regeneration pipe provided with a second regeneration valve and the third regeneration pipe provided with a third regeneration valve, and the other end is respectively connected to the pure water pipe provided with a pure water valve, the alkali pipe provided with an alkali valve and the acid pipe provided with an acid valve, the pure water pipe is connected to the recovery pipe via the backwash pipe provided with a backwash valve; one end of the brine replacement pipe provided with a brine replacement valve is connected to the discharge main pipe, and the other end is connected to the acid-base recovery pipe provided with an acid-base recovery valve, and the acid-base recovery pipe is connected to the neutralization tank.

3. A brine refining system for reducing resin breakage according to claim 1, characterized in that: The brine heat exchanger is connected with a heat exchange upper water pipe and a heat exchange return water pipe, and at least one is provided. The filtered brine pump is provided with a frequency converter, and the frequency converter, the brine feed valve and the high-level tank level gauge are electrically connected.

4. A brine refining system for reducing resin breakage according to claim 1, characterized in that: The neutralization tank is provided with a neutralization water pump, a water diversion tank, a stirrer, a pH meter I, a pH meter II and a neutralization tank level gauge, and the outlet of the neutralization water pump is connected to a salt water recovery tank.

5. A brine refining system for reducing resin breakage according to claim 1, characterized in that: The high-level tank is provided with a high-level tank liquid level meter and a high-level tank overflow pipe. The high-level tank liquid level meter is electrically connected to the brine feed valve, and the high-level tank overflow pipe is connected to the filtered brine tank.

6. A brine refining system for reducing resin breakage according to claim 1, characterized in that: A drain valve is provided at the bottom of the refined brine filter.

7. A brine refining system for reducing resin breakage according to claim 1, characterized in that: A water filter cap, a water filter cap fixing plate and a lower sieve plate are arranged at the bottom of the resin tower. The water filter cap is evenly fixed on the water filter cap fixing plate. The water filter cap fixing plate is fixedly connected to the lower sieve plate by bolts.

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