CN1045725C - Method and apparatus for treatment of circulating cooling water in air-conditioning system - Google Patents

Abstract

The invention discloses a method and a device for treating circulating cooling water of an air-conditioning system. The method is to fix the functional carbon fiber treatment material in the circulating cooling water process, and let the water pass through the treatment material naturally. It is composed of a shell and installed in the air conditioning system, which is simple and easy to use. Using the method and device of the present invention to process the circulating cooling water of the air conditioning system has the advantages of high efficiency, saving manpower and material resources, saving maintenance costs, keeping equipment and pipelines clean, and will not bring new water pollution, etc., and can also prolong the service life of equipment and maintenance period.

Description

Air Conditioning System Circulating Cooling Water Treatment Method and Device

The invention relates to a water treatment method and a device thereof, in particular to a method and a device for treating circulating cooling water of an air-conditioning system.

During the use of the treatment method for the cooling water of the air conditioning system, due to: 1. High concentration of dissolved oxygen, 2. Contains various pollutants in the air, 3. Removal of _CO2 , 4. Concentration of solid substances in water, 5. Suspended in water Due to the accumulation of pollutants and the reproduction of microorganisms, the water quality gradually deteriorates, causing corrosion, scaling, and biological slime caused by the proliferation of microorganisms in the refrigeration equipment, which reduces the heat exchange efficiency and cooling capacity of the refrigeration equipment. Corrosion and perforation of the equipment caused leakage and affected the normal operation of the refrigeration equipment.

For the water quality treatment of the cooling water of the air-conditioning system, chemical agents are mostly used at present, that is, chemicals with different properties are regularly and quantitatively added to the water circulation system in order to improve water quality, anti-corrosion, anti-scale, and kill microorganisms. For example, adding Chelating agents such as polyphosphates that can complex with Ca ²⁺ and Mg ²⁺ , or introduce CO ₂ to reduce the pH value of cooling water, increase the solubility of Ca ²⁺ and Mg ²⁺ , and make Ca ²⁺ and Mg ²⁺ It is not easy to generate inorganic salt precipitation. Adding dispersant such as polyacrylate can hinder the growth and normal aggregation of CaCO ₃ and MgCO ₃ crystals, making it difficult for the precipitate to form a dense and firm scale layer on the metal surface. The above can play a role Anti-scaling effect; introducing chlorine gas into the water or adding chlorine-containing compounds, organic quaternary ammonium salts and other fungicides can prevent the reproduction of microorganisms; anti-corrosion methods include anode passivation and cathodic protection, the former is added in circulating cooling water Oxidants such as chromate, nitrite, etc., oxidize on the metal surface to form a corrosion-resistant oxide film, which is added with corrosion inhibitors such as polyphosphate. Since the chemical agent method needs to add a variety of drugs to play the role of anti-corrosion, anti-scaling, and inhibition of microbial growth, it is inevitable that chemical reactions will occur between the various agents added, and chemical agents must be added regularly and quantitatively. Improper control will accelerate the deterioration of water quality. , produce the opposite effect; at the same time, the Cr ⁶⁺ and NO ^2- in the added medicine will bring water pollution, therefore, it is difficult to fundamentally improve the water quality of the cooling water by the chemical agent method, and the refrigeration equipment still has a certain degree of The generation of polluting microorganisms and corrosion phenomena, after a period of operation, it needs to be shut down to remove dirt, etc., in order to ensure that the cooling system continues to operate normally.

The purpose of the present invention is to provide a treatment method and device for circulating cooling water of an air-conditioning system, which fundamentally improves water quality, effectively prevents corrosion, scaling and microbial growth in the system, and ensures long-term normal operation of the refrigeration system.

The method of the invention is to fix the processing material in the circulating cooling water flow of the air conditioning system, and let the cooling water flow through the processing material naturally, and the processing material used is functional carbon fiber.

The amount of processing materials depends on the circulation system. For open cooling towers, when the circulating water volume is T (tons/hour), the amount of processing materials A (kg)=(0.04～0.07)T+0.5; for the chilled water circulation system, When the total amount of frozen water is T (ton), the amount of processing material is A (kg)=(1/3～1/2)T.

In order to fix the processing material in the cooling water process, the present invention designs a special processing device, which is composed of a filter core and a casing. The filter core includes a core sleeve and a processing material, wherein the core sleeve is made of water-permeable material. , the processing material inside the core sleeve is functional carbon fiber; the shell includes a shell, a water inlet, and a water outlet.

The core sleeve can also be divided into several parts, and the processing material is evenly distributed in each part, so as to avoid the uneven distribution of the processing material due to the impact of the water flow.

A dust screen can be added between the water inlet and the filter element to remove dust and floating matter, which can prevent the dust and floating matter from being deposited on the core sleeve of the filter element, which prevents the cooling water from passing through the filter element and affects the treatment. effect phenomenon. The dust filter can be removed for cleaning or replacement regularly.

The treatment device of the present invention is installed in the circulating cooling water process of the air conditioning system, and the circulating cooling water flows into the device from the water inlet, passes through the filter core, flows out through the water outlet, and then enters the air conditioning system for the next cycle.

The functional carbon fiber treatment material adopted in the method of the present invention is a heat-resistant, acid and alkali-resistant novel functional material prepared by carbonization and functionalization reactions using natural organic fibers as raw materials. Experiments show that it has the functions of reducing the potential of water, consuming dissolved oxygen in water, and absorbing calcium and magnesium ions in water.

Figure 1 is a graph of potential curves before and after adding ZS-1 functional carbon fiber in tap water measured with a platinum electrode. The potential measured in water, part ② is the potential measured after adding functional carbon fiber. It can be seen from the results that after adding ZS-1 functional carbon fiber, the potential in water drops significantly, which is an important reason for the anti-corrosion performance of ZS-1 functional carbon fiber reason.

The experimental results of dissolved oxygen in water consumed by functional carbon fibers are shown in Table 1. The concentration of dissolved oxygen in water before and after adding functional carbon fibers is measured by the _MnSO4 method. The first column in the table is the experimental results in pure water, and the second and second columns are Experimental results after adding ZSA and ZS-1 functional carbon fibers into pure water. Functional carbon fiber can consume dissolved oxygen in water, and within 60 minutes, the content of dissolved oxygen in water can be reduced by 16-22.5%. This is because functional carbon fiber has a strong adsorption capacity, which can absorb oxygen dissolved in water to the surface of the fiber. And react with it to generate _CO2 and consume oxygen, thereby reducing the degree of metal corrosion.

Table 1 system dissolved volume 0.1M Na ₂ S ₂ 0 ₃ consumption (ml) Dissolved oxygen (mg/l) Measurement time (min) Measurement time (min) 20 60 20 60 Water water + ZS-A water + ZS-1 202020 2.50 2.50 2.10 2.06 1.94 2.05 400 400336 330310 328

Table 2 shows the experimental results of functional carbon fibers on the adsorption of calcium and magnesium ions in water. The concentrations of calcium and magnesium ions in the table are measured by atomic absorption spectrometry. Test No. 1 is tap water, and tests No. 2, 3 and 4 are tap water Adding functional carbon fiber, the results show that after adding functional carbon fiber to tap water, the concentration of calcium and magnesium ions decreases. The reduction of ion concentration can reduce the generation of calcium carbonate and magnesium carbonate precipitates, thereby reducing the scale growth of air-conditioning equipment and pipelines.

Table 2 Test No. Time (day) Concentration (ppm) 0 7 16 33 57 101 1 Ca ²⁺ Mg ²⁺ 20.02.35 20.02.35 20.22.36 20.72.38 19.02.35 20.52.35 2 Ca ²⁺ Mg ²⁺ 20.02.35 12.01.88 11.01.86 9.251.80 7.501.70 7.751.60 3 Ca ²⁺ Mg ²⁺ 20.02.35 13.02.33 12.82.30 12.72.10 12.52.10 12.01.75 4 Ca ²⁺ Mg ²⁺ 20.02.35 11.01.63 10.31.6 8 9.251.60 7.251.43 8.000.875

In addition, because the functional carbon fiber itself does not contain the nutrients such as N and P needed for the growth of microorganisms, and the decrease in the concentration of dissolved oxygen in the water makes the microorganisms lose the environmental conditions for their growth and reproduction. Therefore, the addition of functional carbon fibers inhibits the The reproduction and growth of microorganisms avoids the biological slime produced by microorganisms.

The ZS-1 functional carbon fiber used in the above experiments was produced by Guangdong Hanhui Functional Fiber Industrial Company.

The above-mentioned functions of functional carbon fiber can fundamentally improve the water quality of circulating cooling water, play the role of anti-corrosion, anti-scaling, and inhibit the growth of microorganisms, keep equipment and pipelines clean, and ensure the long-term normal operation of the air-conditioning system.

The method of the present invention is simple, only need to fix the functional carbon fiber processing material in the circulating cooling water process, so that the cooling water flows through the processing material naturally, the device used in the method of the present invention is only composed of a filter core and a shell, and the processing material is contained in the filter core , the device is easy to install in the original system without changing the original equipment. Compared with the chemical agent method, using the method and device of the present invention to treat the circulating cooling water of the air conditioning system has high efficiency, saves manpower and material resources, and will not bring It not only prolongs the service life and maintenance period of the equipment, but also saves maintenance costs.

The following results have examples and accompanying drawings to further illustrate the present invention.

Fig. 2 is a schematic structural view of the filter core, wherein Fig. 2a is a front view of the filter core, and Fig. 2b is a C-C sectional view of Fig. 2a.

Fig. 3 is the schematic diagram of processing device in the open cooling tower;

Fig. 4 is the A-A sectional view of Fig. 3;

Fig. 5 is the schematic diagram of processing device in the chilled water circulation system;

FIG. 6 is an enlarged schematic view of the section B-B in FIG. 5 .

The circulating cooling water treatment device in the open cooling tower is shown in Figure 3 and Figure 4. There is a water inlet pipe (7) in the center of the cooling tower, and the treatment device is placed in the lower half of the cooling tower, on both sides of the water inlet pipe (7). And fixed on the shelf (6), the processing device is composed of a filter element (1) and a casing (2). The casing is two approximately semicircular disks made of PVC plastic or glass steel, and the semicircular edge of the disk is upward and outward. Tilt so that as much cooling water as possible flows through the device, the mouth of the pan is the water inlet (4), the bottom of the mesh pan is the water outlet (5), and there is a dust-proof net (3) above the filter element. After being cooled in the cooling tower, the circulating water flows into the mouth of the pan (water inlet), first flows through the dust filter, then passes through the filter element, then flows through the bottom of the mesh pan (water outlet), and finally exits the cooling tower for the next cycle.

The filter core (1) is approximately cuboid (shown in Figure 2A), and is made according to the following steps:

① Sew a small rectangular bag with polyester mesh, seal it after filling the processing material, and make it into a small filter element; the processing material used is ZS-1 functional carbon fiber produced by Guangdong Hanhui Functional Fiber Industrial Company;

②Use polyester mesh to sew large rectangular bags, and then sew them at a certain distance along the short axis direction to divide the large rectangular bags into several small rectangular bags to form core sleeves (2B);

③Put the small filter elements into each small rectangular bag in the core sleeve to form an approximately rectangular parallelepiped filter element.

The processing device in the chilled water circulation system is shown in Figure 5 and Figure 6. The device is installed at the original water inlet (9) of the circulation system, and the circulating water flows in from the water inlet (4) of the device and flows through the dust filter (3). Pass through the filter element (1), flow out from the water outlet (5), and then enter the circulation system. The filter element (1) is approximately cylindrical in shape, and is rolled by an approximately rectangular parallelepiped filter element (Fig. 2A) along the long side (Fig. 6). The shell (2) is made of metal or plastic, with a cylindrical middle part and conical sides. Shape, two ends are made water inlet (4) and water outlet (5) respectively. The middle part and both sides are connected with flanges (8) to facilitate installation and disassembly.

Claims (8)

1. A method for treating circulating cooling water in an air-conditioning system, characterized in that the treatment material is fixed in the cooling water flow process, allowing the cooling water to pass through the treatment material naturally, and the treatment material used is functional carbon fiber, and the functional carbon fiber is based on carbon. It is a fibrous functional material with ion exchange, adsorption and redox properties containing ion exchange groups, redox groups, and adsorption surfaces. The functional carbon fiber is ZS-1 functional carbon fiber produced by Guangdong Hanhui Functional Fiber Industrial Company. 2. The method according to claim 1, characterized in that the amount A of the treatment material is: for an open cooling tower, when the circulating water volume is T (ton/hour), A (kg)=(0.04～0.07) T+0.5, for the chilled water circulation system, when the total chilled water is T (ton), A (kg)=(1/3～1/2)T. 3. A special device for the method according to claim 1, characterized in that the device consists of a filter core (1) and a casing (2), the filter core includes a core cover (2B) and a treatment material (2A), wherein the core cover It is made of water-permeable material, and the processing material (2A) inside the core sleeve is ZS-1 functional carbon fiber produced by Guangdong Hanhui Functional Fiber Industry Co., Ltd. The shell includes a shell, water inlet (4), and water outlet (5) . 4. The device according to claim 3, characterized in that said filter element (1) is approximately cuboid, and the shell (2) is two approximately semicircular disks made of PVC plastic or glass steel, and the mouth of the disk is It is a water inlet (4), and the bottom of the reticulated dish is a water outlet (5). 5. The device according to claim 3, characterized in that said filter element (1) is approximately cylindrical, the middle part of the shell (2) is cylindrical, the two sides are conical, and the two ends are water inlets ( 4) and water outlet (5). 6. The device according to claim 3, characterized in that there is a dust-proof net (3) between the water inlet (4) and the filter element (1). 7. The device according to claim 3, characterized in that said core sleeve (2B) is made of polyester mesh. 8. The device according to claim 3, characterized in that said core casing (2B) can be divided into several parts, and the processing material (2A) is uniformly distributed in each part.

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