CN-117566893-B - Environment-friendly type conventional cooling tower biological slime control method

Abstract

The invention provides an environment-friendly biological slime control method for a conventional cooling tower, and relates to a metal-organic composite material microorganism electric coupling porous membrane structure. The structure comprises an active carbon fiber felt anode and an air cathode, wherein the air cathode comprises porous PTFE as a diffusion layer, mnCo/NC nitrogen doped bimetal-based carbon composite organic material as a cathode catalyst layer and porous carbon material as a base electrode. The anode and the air cathode are fixed into an integral metal organic composite material microorganism electric coupling porous membrane structure by adopting a woven metal fiber net structure. The metal organic composite material microorganism electric coupling porous membrane structure is placed on the water surface of a water collecting tank at the bottom of a conventional cooling tower, large-particle pollutants are filtered, microorganisms in water are adsorbed, and algae growth in water is inhibited. The invention realizes the control of the biological slime in the circulating cooling water pipe network by removing large-particle biological slime flocs, organic and inorganic pollutants and microorganisms in the circulating cooling water.

Inventors

• LIU SHANGCAI
• ZHAO RUI
• WANG LI
• SONG ZHANMING
• WANG JI
• LI SHENG
• WANG JIN
• ZHOU JUN
• Qiu Youze
• QIAO LU
• Han Xiuwei
• CHENG DALU
• LI PEILIANG
• YU ZHONGJUN

Assignees

• 哈尔滨热电有限责任公司

Dates

Publication Date

20260512

Application Date

20231011

Claims (6)

1. 1. The method is characterized in that a metal organic composite material microorganism electric coupling porous membrane structure is placed in a water collecting tank of a conventional cooling tower; the metal organic composite material microorganism electric coupling porous membrane structure comprises an anode layer and a cathode layer, wherein the cathode layer comprises a catalyst layer, a basic electrode layer and a diffusion layer, the catalyst layer and the diffusion layer are respectively coated on two sides of the basic electrode layer, the anode layer and the cathode layer are fixed by adopting a metal wire braiding or hot pressing method, the anode layer is adjacent to one side of the cathode layer coated with the catalyst layer, the anode layer is made of an activated carbon fiber felt, the diffusion layer is made of PTFE, the catalyst layer is made of a MnCo/NC nitrogen doped bimetallic carbon composite organic material, the basic electrode layer is made of a porous carbon material, and the inside of the basic electrode layer is a honeycomb morphology structure with mutually penetrated macropores.
2. 2. The method for controlling biological slime of an environment-friendly conventional cooling tower according to claim 1, wherein the preparation method of the diffusion layer is characterized in that 40% polytetrafluoroethylene emulsion is uniformly brushed on a base electrode layer, small bubbles remained on the surface and caking of polytetrafluoroethylene are removed for preventing smearing on the other side, the coating is dried for more than 10 minutes until the surface turns white, the coating is placed in a muffle furnace for drying for more than 20 minutes at 360-380 ℃, and the above operation is repeated for 4-5 times to form 4-5 compact diffusion layers.
3. 3. The method for controlling biological slime of an environment-friendly conventional cooling tower according to claim 1, wherein the preparation method of the material used for the catalyst layer is that the material is prepared by pyrolyzing precursor MnCo-ZIF-67 nanocrystals at a high temperature of 800-850 ℃, the heating rate is 5 ℃ min -1 , and the material is cooled to room temperature along with a furnace after being kept warm for 2-h.
4. 4. The method for controlling biological slime of an environment-friendly conventional cooling tower according to claim 3, wherein the MnCo-ZIF-67 nanocrystals are prepared by a common solution method.
5. 5. The method for controlling biological slime of an environment-friendly conventional cooling tower according to claim 4, wherein the common solution method is characterized in that 12 mmol of 2-methylimidazole (2-MeIM) is dissolved in 30 mL methanol to form a uniform solution A, 3 mmol cobalt nitrate hexahydrate and 1mmol manganese nitrate hexahydrate are dissolved in 30 mL methanol to form a uniform solution B, the solution A is slowly poured into the solution B and magnetically stirred at room temperature for 30 min, the solution A is centrifuged to obtain purple precipitate, the purple precipitate is washed 3 times with methanol, and 12h is dried at 60 ℃ to obtain MnCo-ZIF-67.
6. 6. The method for controlling biological slime of an environment-friendly conventional cooling tower according to claim 1, wherein the preparation method of the catalyst layer is characterized in that MnCo/NC nitrogen doped bimetal based carbon composite organic material is ground for 30-35 min, 40 mg fine powder is weighed and put into a centrifuge tube, 400 mu L of ethanol, 100 mu L of distilled water and 25 mu L of Nafion solution are added, ultrasonic vibration is carried out until the catalyst is uniformly dispersed in the solution, the catalyst layer is smeared on the other side of a basic electrode layer, and the catalyst layer is dried at room temperature for 24-h, so that a compact catalyst layer is formed.

Description

Environment-friendly type conventional cooling tower biological slime control method Technical Field The invention belongs to the field of microorganism electrochemical prevention and treatment of circulating cooling water, and particularly relates to a metal organic composite material microorganism electric coupling porous membrane structure of a conventional cooling tower, wherein a water collecting tank at the bottom of the tower is used for adsorbing microorganisms, filtering microorganism slime and preventing algae from growing. Background Because the temperature of the circulating cooling water is higher and the water quality is unstable, microorganisms can easily grow in the cooling tower, so that biological slime is generated. The main components of the biological slime are various complex microorganisms such as algae, bacteria, fungi and inorganic and organic impurities. The form of the biological slime is a viscous transparent substance, and the biological slime is flocculent after being dispersed in water. The main sources of microorganisms in the circulating cooling water are two, namely, a large amount of air is required to be introduced into the cooling water in the evaporation heat exchange process of the water by the cooling tower, the microorganisms are also carried into the cooling water along with the air, and microorganisms are arranged in the supplementing water of the cooling water system and enter the cooling water system along with the supplementing water. Under the irradiation of sunlight, algae can photosynthesis with carbon sources such as carbon dioxide and bicarbonate in water, absorb carbon as nutrition and release oxygen, so that when algae are propagated in large quantity, the content of dissolved oxygen in water can be increased, the depolarization of oxygen is facilitated, and the corrosion process is accelerated. The large amount of biological slime can cause pipeline blockage and cooling efficiency reduction of the cooling tower, slime is deposited in the heat exchanger, heat transfer efficiency reduction and head loss increase, the slime deposited on the metal surface can cause serious under-scale corrosion, and meanwhile, the effect of the corrosion and scale inhibitor on the metal is isolated, so that the chemical cannot exert due corrosion and scale inhibition effects. In addition to the accelerated corrosion of the microbial slime under the scale, some bacteria directly corrode metals in the metabolic process due to biological secretion. All these problems result in that the circulating water system cannot run safely for a long time, the production is affected, and serious economic losses are caused, so that the harm of microorganisms is as serious as the harm of scale and corrosion to the cooling water system, and even so to say, the harm of microorganisms is first controlled by comparing the three. The most common method for controlling microorganisms is to add a bactericide, but the bactericide is not environment-friendly, so that the pollution of discharged wastewater exceeds standard and the cost is high, and the microorganisms can generate drug resistance to drugs. Even if the bactericide is good in effect, stripped biological sticky mud can exist in a pipe network system, and the pipeline can be blocked due to untimely cleaning, and the biological sticky mud is accumulated in a condenser, a heat exchanger, a cooling tower coil pipe and a filler. The conventional cooling tower is especially one hyperbolic natural ventilating reinforced concrete wet cooling tower with regenerated water as circulating cooling water. Most of the cooling structures adopted by large power plants are hyperbolic cooling towers, as shown in fig. 2. Such cooling towers are often used in inland water-starved power stations. The tower body is a hyperbolic rib-free and beam-free column thin-wall space structure which is beneficial to natural ventilation and is manufactured by multi-purpose reinforced concrete. The upper part of the cooling tower is a ventilating drum and mainly comprises a lower ring beam 5, a cylinder wall 6 and a tower top rigid ring 7. The lower ring beam 5 is positioned at the lower end of the ventilation tube shell, and the dead weight of the ventilation tube and other load born by the ventilation tube are transmitted to the inclined strut 8 through the lower ring beam 5 and then transmitted to the foundation. The cylinder wall 6 is the main part of the cooling tower ventilating cylinder, is of a high-rise thin shell structure mainly bearing wind load, and is very sensitive to wind. The top rigid ring 7 is located at the top of the shell and is a top stiffening hoop for the shell which stiffens and stabilizes the top of the shell. The height of the cooling tower is generally 75-150 m, the diameter of the bottom edge is 65-120 m. The lower part of the cooling tower is provided with a water distribution tank 9 and a water spraying device 10, which are made of PE or PVC