Combined multifunctional lithium bromide solution on-line / off-line regenerator

Abstract

The utility model provides a combined multifunctional lithium bromide solution on-line / off-line regenerating device, which comprises at least one filter, the filter is provided with a filtering structure for filtering at least one kind of impurities in the solution; the impurities are at least one kind of organic compounds, heavy metal ions and solid impurities; the liquid inlet of the filter at the first end can be selectively connected to the bypass pipeline interface of the solution pump outlet of the lithium bromide unit, or connected to the outlet pipeline of the external driving pump in the off-line mode after the lithium bromide unit discharges the solution, or directly receive the solution to be treated in the off-line mode by relying on the gravity flow delivery mode. The utility model can comprehensively solve the deterioration problem of the solution, restore the use performance of the regenerated solution; on the other hand, it can be used as an auxiliary component of the lithium bromide absorption type cold and warm water unit, powered by the solution pump of the unit, on-line bypass circulation, continuously cleaning and regenerating the solution; it can also be operated independently to off-line treat the lithium bromide solution contaminated outside the unit.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a combined multifunctional online / offline regeneration device for lithium bromide solution. Background Technology

[0002] Lithium bromide absorption chiller / hot water unit (hereinafter referred to as the unit) uses various thermal energy sources and lithium bromide solution as the working medium to produce chilled and hot water. The engineering materials used in the unit are mainly steel, copper, and stainless steel. Because lithium bromide solution is corrosive to metals, and the high operating temperature within the unit exacerbates corrosion, corrosion and various chemical reactions occur after a period of operation, leading to changes in the solution's properties.

[0003] For example, when steel reacts with water in a lithium bromide solution at high temperatures, it produces oxides and hydrogen gas. These oxides can make the solution cloudy and even clog nozzles, filters, pumps and pipes, causing the unit's output to decrease or even stop working.

[0004] For example, the corrosion of copper produces copper ions, which undergo a displacement reaction with steel to corrode the steel. The copper particles produced by the reduction create many tiny galvanic cell structures on the surface of the steel, further promoting the electrochemical corrosion of the steel.

[0005] For example, octanol reacts with oxides in a solution to produce organic acids, which are surfactants that cause the solution to foam. When boiling, the foam accumulates, causing the unit's output to decrease or even preventing it from working properly.

[0006] The above problems lead to a decline in unit performance or even shutdown, frequently requiring the solution to be drained and treated, or even replaced, which is time-consuming and labor-intensive. Although there are methods using hollow fiber online filtration to remove the solution, these can only remove solid impurities and cannot solve the problems of solution foaming and / or electrochemical corrosion caused by copper ions. Utility Model Content

[0007] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a simple, flexible, and multifunctional combined online / offline regeneration device for lithium bromide solution. It can be used as an auxiliary component of lithium bromide absorption chiller units to achieve online bypass circulation, continuously clean the solution, and restore the performance of the regenerated solution; or it can be operated independently to treat solutions contaminated outside the unit offline.

[0008] The technical solution of this utility model is: a combined multifunctional online / offline regeneration device for lithium bromide solution, including at least one filter, wherein the filter is provided with a filtration structure for filtering at least one type of impurities in the solution; the impurities are at least one of organic compounds, heavy metal ions and solid impurities; and the inlet of the filter at the first end can be selectively connected to the bypass pipeline interface of the solution pump outlet of the lithium bromide unit, or connected to the outlet pipeline of an external drive pump in the offline mode after the lithium bromide unit solution is discharged, or directly receive the solution to be treated by gravity flow in the offline mode of the lithium bromide unit.

[0009] Furthermore, it includes at least two filters, which are combinations of different filters selected from a first filter, a second filter, and a third filter; the first filter is used to adsorb organic compounds in the solution; the second filter is used to filter heavy metal ions in the solution; and the third filter is used to filter solid impurities in the solution.

[0010] Furthermore, the first filter, the second filter, and the third filter are connected in series along the solution flow path.

[0011] Furthermore, the first filter is an activated carbon filter filled with activated carbon particles; the second filter is a zinc sulfide filter filled with zinc sulfide particles or a ferrous sulfide filter filled with ferrous sulfide particles; or the first filter and the second filter are combined into one filter, and activated carbon particles and zinc sulfide / ferrous sulfide particles are mixed and filled in the filter; the third filter is a hollow fiber filter.

[0012] Furthermore, the zinc sulfide filter is filled with 50-500 mesh zinc sulfide particles; or the ferrous sulfide filter is filled with 50-500 mesh ferrous sulfide particles.

[0013] Furthermore, the hollow fiber filter contains a bundle of hollow fibers, the walls of which are filled with micropores with a diameter of 0.01-0.05 μm.

[0014] Furthermore, the lithium bromide unit is a lithium bromide absorption chiller / warm water unit. The output solution is divided into two branches by a solution pump. One branch is the normal circulation pipeline of the unit solution, and the other branch is the solution purification and regeneration bypass pipeline. The bypass pipeline is connected to the filter at the beginning via a first valve. The outlet of the filter at the end is connected to the normal circulation pipeline of the unit solution or the inlet of the solution pump via a second valve, forming an online bypass circulation pipeline when the unit is working.

[0015] Furthermore, both the first and second filters are provided with a pre-filter and a post-filter inside their housings, which together define a cavity for filling with particulate packing material.

[0016] Furthermore, the hollow fiber bundles inside the hollow fiber filter are fixed in the housing by a colloid seal, and the housing of the hollow fiber filter is also provided with a multi-functional port, which has the dual functions of a slag discharge port and a vacuum port.

[0017] Furthermore, when at least two filters are combined, the housings of each filter are connected by flanges or clamps.

[0018] The beneficial effects of this invention are as follows: Firstly, by using an activated carbon filter to adsorb organic compounds such as surfactants and copper ions, and by using a zinc sulfide filter to remove copper ions through a chemical reaction between zinc sulfide particles and copper ions, and by using a hollow fiber filter to remove mechanical impurities from the solution, the problem of solution deterioration can be comprehensively solved, achieving the restoration of the regenerated solution to its usability. Secondly, it can be used as an auxiliary component of a lithium bromide absorption chiller / warm water unit, powered by the unit's solution pump, to bypass and circulate online, continuously cleaning the regenerated solution; it can also operate independently to treat lithium bromide solutions contaminated outside the unit offline, offering versatility. Furthermore, different filter combinations can be selected according to the solution deterioration, and the filter media is replaceable, making it simple to use and highly flexible. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] Explanation of reference numerals in the attached diagram: 1. Activated carbon filter; 2. Zinc sulfide filter; 3. Hollow fiber filter; 4. Solution pump; 5. Normal circulation pipeline of unit solution; 6. First valve; 7. Second valve; 8. Third valve; 11. Pre-filter; 12. Post-filter; 13. Activated carbon granules; 21. Zinc sulfide granules; 31. Hollow fiber bundle; 32. Colloid. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1The diagram shows a combined multifunctional online / offline regeneration device for lithium bromide solution, used for multifunctional online and offline purification of solutions in lithium bromide absorption chiller units. The device includes an activated carbon filter 1, a zinc sulfide filter 2, and a hollow fiber filter 3. During unit operation, the solution output from the lithium bromide absorption chiller unit is divided into two branches by a solution pump 4. One branch is the normal circulation pipeline 5 of the unit solution, and the other branch is a solution purification and regeneration bypass pipeline. This bypass pipeline is connected in series with the activated carbon filter 1, zinc sulfide filter 2, and hollow fiber filter 3 via a first valve 6. The outlet of the hollow fiber filter 3 is connected to the normal circulation pipeline 2 of the unit solution via a second valve 7.

[0023] When the unit is offline and the solution is processed separately, the connection with solution pump 4 is disconnected. Power can be provided by gravity or by adding a corrosion-resistant chemical pump at the front end of the bypass pipeline to drive the solution to be treated to complete the entire purification process.

[0024] In this embodiment, the activated carbon filter 1 is filled with several activated carbon particles 13, which adsorb organic compounds such as surfactants present in the solution through the adsorption performance of the activated carbon particles 13, thereby eliminating the foaming problem of the solution; at the same time, the activated carbon also adsorbs most of the copper ions and other heavy metal ions present in the solution, making the solution clean. When used in combination, the activated carbon filter 1 is located at the front stage.

[0025] In this embodiment, the zinc sulfide filter 2 is filled with 50-500 mesh zinc sulfide particles 21 to provide a sufficiently large reaction area without clogging. Furthermore, stainless steel mesh with a larger mesh size is used before and after the zinc sulfide particles to constrain the particles and prevent them from being dispersed. This filter removes copper ions by chemically reacting the zinc sulfide particles 21 with them. Because the solubility of copper sulfide is much lower than that of zinc sulfide, copper ions react with zinc sulfide to produce copper sulfide (solid), which is then retained. The zinc ions produced by the reaction react with lithium chromate, a corrosion inhibitor in the lithium bromide solution, to produce insoluble zinc chromate (solid), which is also retained and not carried into the solution. The chemical reaction is as follows: Cu 2+ +ZnS==Zn 2+ +CuS (precipitate) Zn 2+ +CrO4==ZnCrO4 (precipitate) It is understandable that ferrous sulfide can be used instead of zinc sulfide in filters filled with zinc sulfide particles. The preferred particle size for ferrous sulfide is 50-500 mesh to provide a sufficiently large reaction area without causing clogging. Furthermore, stainless steel mesh with a larger mesh size is used before and after the particles to constrain the particles and prevent them from being dispersed. Copper ions are removed by utilizing the chemical reaction between ferrous sulfide particles and copper ions. Because the solubility of copper sulfide is much lower than that of ferrous sulfide, copper ions react with ferrous sulfide to produce copper sulfide (solid), which is then retained. The ferrous ions produced by the reaction react with lithium hydroxide in the lithium bromide solution to produce insoluble ferrous hydroxide (solid), which is also retained and not carried into the solution. The chemical reaction is as follows: Cu 2+ +FeS==Fe 2+ +CuS (precipitate) Fe 2+ +2OH - ==Fe(OH)2 (precipitate) More preferably, the zinc sulfide particles or ferrous sulfide particles have a mesh size of 100-300 mesh. When used in combination, the zinc sulfide filter 2 is located after the activated carbon filter 1.

[0026] In this embodiment, the hollow fiber filter 3 is located after the zinc sulfide filter 2. It contains a hollow fiber bundle 31, the walls of which are filled with micropores, preferably with a diameter of 0.01-0.05 μm. This allows for the filtration of mechanical impurities in the solution, including fine particles detached from the first two filters, thus thoroughly removing solid impurities and achieving regeneration. Given the high salinity, high alkalinity, strong oxidizing agent content, and potentially high temperature of the solution, the hollow fiber material is preferably polyvinylidene fluoride, polypropylene, polysulfone, or similar materials.

[0027] In this embodiment, the housings of all three filters are made of stainless steel or other corrosion-resistant materials, possessing a certain strength and corrosion resistance. The housings of the three filters can be connected by flanges or clamps. Each filter housing is made of stainless steel filter cartridges, which can be placed horizontally or vertically, with an inlet at one end and an outlet at the other. The three stainless steel filter cartridges are preferably connected as a single unit via flanges, forming a multi-stage filtration structure. The housings of each filter are designed as detachable structures, for example, as multi-section structures, with each section sealed by flanges or threads; alternatively, the housings may have inlets and outlets for filling with granular packing material, facilitating the replacement of the internal packing.

[0028] Understandably, depending on the deterioration of the lithium bromide solution, this embodiment can select at least one filter for corresponding functional combination settings. For example: if the solution easily foams, select activated carbon filter 1; if the solution has too high a copper ion content, select zinc sulfide filter 2 (or ferrous sulfide filter); if the solution is turbid, select hollow fiber filter 3; if the solution easily foams and has too high a copper ion content, select activated carbon filter 1 plus zinc sulfide filter 2; if the solution easily foams and is turbid, select activated carbon filter 1 plus hollow fiber filter 3; if the solution has too high a copper ion content and is turbid, select zinc sulfide filter 2 plus hollow fiber filter 3; if the solution foams, has high copper ion content, and is turbid, then select all three filters in combination.

[0029] In this embodiment, the activated carbon filter 1 has a pre-filter 11 and a post-filter 12 inside its housing. The pre-filter, post-filter, and the inner wall of the housing together define a cavity for filling with particulate packing material, which is used to confine the particles and prevent them from being dispersed by the solution. The pre-filter 11 and post-filter 12 are preferably stainless steel filters. The pre-filter 11 and post-filter 12 are fixedly or detachably installed; for example, the filters can be snapped, welded, or threaded into the housing.

[0030] Similarly, the zinc sulfide filter 2 also has a pre-filter and a post-filter inside its housing, with the same structure as the activated carbon filter, which will not be described in detail here.

[0031] The hollow fiber bundle 31 inside the hollow fiber filter 3 is sealed and fixed within the housing by a colloid 32. Furthermore, the housing of the hollow fiber filter 3 is equipped with a multi-functional port, which serves as both a slag discharge port and a vacuum port: firstly, it is used to remove trapped solid impurities via backwashing during maintenance; secondly, it can be connected to an external vacuum device to remove air from the housing and inside the hollow fiber membrane before system startup, preventing gas from entering the unit and affecting the vacuum level and cooling effect, while also preventing air blockage and ensuring filtration efficiency. A third valve 8 is installed on the output pipe of the multi-functional port.

[0032] Understandably, this device can be used as an auxiliary component in lithium bromide absorption chiller / thermal water units. During unit operation, it utilizes the unit's solution pump 4 for online bypass circulation, continuously cleaning and regenerating the lithium bromide solution. Alternatively, this device can operate independently, using gravity or an additional corrosion-resistant chemical pump for offline filtration and treatment of contaminated lithium bromide solution. The purified and regenerated solution can then be used as the unit's working fluid or recycled as a valuable chemical raw material.

[0033] It is understood that the activated carbon filter 1 filled with activated carbon particles and the zinc sulfide filter 2 filled with zinc sulfide particles in this embodiment can also be combined into one filter, and activated carbon and zinc sulfide are mixed and filled in the filter. This structure is convenient for processing small amounts of lithium bromide solution.

[0034] In summary, this embodiment comprehensively addresses the problem of solution deterioration by using activated carbon filters to adsorb surfactants and other organic compounds, as well as copper ions. It also removes copper ions through a chemical reaction between zinc sulfide particles and copper ions in a zinc sulfide filter, and utilizes hollow fiber filters to remove mechanical impurities from the solution. This allows the regenerated solution to regain its usability. Furthermore, it can function as an auxiliary component of a lithium bromide absorption chiller / warm water unit, using the unit's solution pump for online bypass circulation to continuously clean the regenerated solution. Alternatively, it can operate independently to treat lithium bromide solutions contaminated outside the unit offline, offering versatility. Moreover, this embodiment allows for different filter combinations based on solution deterioration conditions, and its filter media is replaceable, making it simple to use and highly flexible.

Claims

1. A combined multifunctional online / offline regeneration device for lithium bromide solution, characterized in that, It includes at least one filter, which has a filtration structure for filtering at least one type of impurities in the solution; the impurities are at least one of organic compounds, heavy metal ions and solid impurities; and the inlet of the filter at the first end can be selectively connected to the bypass pipeline interface of the solution pump outlet of the lithium bromide unit, or connected to the outlet pipeline of an external drive pump in the offline mode after the lithium bromide unit has discharged the solution, or directly receive the solution to be treated by gravity flow in the offline mode of the lithium bromide unit.

2. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 1, characterized in that, It includes at least two filters, which are selected from a combination of different filters, namely a first filter, a second filter, and a third filter; the first filter is used to adsorb organic compounds in the solution; the second filter is used to filter heavy metal ions in the solution. The third filter is used to filter solid impurities in the solution.

3. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 2, characterized in that, The first filter, the second filter, and the third filter are connected in series along the solution flow path.

4. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 2 or 3, characterized in that, The first filter is an activated carbon filter filled with activated carbon particles; the second filter is a zinc sulfide filter filled with zinc sulfide particles or a ferrous sulfide filter filled with ferrous sulfide particles; or the first filter and the second filter are combined into one filter, and activated carbon particles and zinc sulfide / ferrous sulfide particles are mixed and filled in the filter; the third filter is a hollow fiber filter.

5. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 4, characterized in that, The zinc sulfide filter is filled with 50-500 mesh zinc sulfide particles; or the ferrous sulfide filter is filled with 50-500 mesh ferrous sulfide particles.

6. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 4, characterized in that, The hollow fiber filter contains a bundle of hollow fibers, the walls of which are filled with micropores with a diameter of 0.01-0.05 μm.

7. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 1, 2, or 3, characterized in that, The lithium bromide unit is a lithium bromide absorption chiller / warm water unit. The output solution is divided into two branches by a solution pump. One branch is the normal circulation pipeline of the unit solution, and the other branch is the solution purification and regeneration bypass pipeline. The bypass pipeline is connected to the filter at the beginning via a first valve. The outlet of the filter at the end is connected to the normal circulation pipeline of the unit solution or the inlet of the solution pump via a second valve, forming an online bypass circulation pipeline when the unit is working.

8. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 4, characterized in that, Both the first and second filters are provided with a pre-filter and a post-filter inside their housings. The pre-filter, post-filter, and the inner wall of the housing together define a cavity for filling with particulate packing material.

9. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 6, characterized in that, The hollow fiber bundles inside the hollow fiber filter are fixed in the shell by a colloid seal, and the shell of the hollow fiber filter is also provided with a multi-functional port, which has the dual functions of a slag discharge port and a vacuum port.

10. The combined multifunctional lithium bromide solution online / offline regeneration device according to claim 2 or 3, characterized in that, When at least two filters are combined, the housings of the filters are connected by flanges or clamps.

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