CN106338216A - Operation specification for cleaning and disinfecting air-conditioner cooling tower - Google Patents

Abstract

The invention relates to an operating procedure for cleaning and disinfecting an air-conditioning cooling tower, which is characterized in that it includes the following steps: Step 1: on-site survey and preparation, conduct on-site survey in the normal operation state of the cooling tower, analyze the actual situation and make a personalized operation plan; survey personnel Personal protection is required, and masks and goggles should be worn; key points of on-site investigation: (1) check the dirt, algae and corrosion degree of the water distributor, packing, tray (storage tray) and return water filter; (2) understand Water replenishment of cooling tower; (3) Check whether the water replenishment valve and sewage valve are intact or leaking; (4) Understand the corrosion degree of the cooling tower bracket; (5) Check whether the exhaust outlet is aligned with the cooling tower (oil fume will increase cleaning difficulty); (6) Write survey reports or suggestions, formulate plans, and prepare suitable cleaning and disinfecting agents, tools and equipment.

Description

An operating procedure for cleaning and disinfecting an air-conditioning cooling tower

technical field

The invention discloses an operating procedure for cleaning and disinfecting an air-conditioning cooling tower, which is a technical specification to be followed for cleaning and disinfecting an air-conditioning system cooling tower and cooling tower water, and belongs to the technical field of cleaning and disinfecting an air-conditioning cooling tower.

Background technique

Cooling towers are mostly built outdoors, with sufficient sunlight and sunshine, and communicated with the atmosphere so that the cooling water can absorb various pollutants in the air, and the uninterrupted supply of water can bring new nutrients. Nutrients make algae and microorganisms in the cooling tower, especially pathogenic microorganisms (such as Legionella), multiply and become a potential source of pollution for diseases; The open cooling tower of the air conditioner shall be cleaned no less than once a year, and Legionella pneumophila shall not be detected in the water of the cooling tower after cleaning, and the accompanying WS 396 -2012 "Code for Cleaning of Centralized Air Conditioning and Ventilation Systems in Public Places" was promulgated to guide the cleaning of the air conditioning system. Cleaning; the following disadvantages exist in the use of this cleaning specification: Due to the lack of detailed and feasible operating procedures, at present, social cleaning institutions in my country are mixed, and their operations are not standardized. In particular, the current cleaning institutions do not need to obtain relevant cleaning qualifications to work, resulting in a mere formality of the cleaning process; The specification does not strictly limit the effective concentration and continuous disinfection time during disinfection, which makes it difficult to achieve the expected disinfection effect. In actual work, it is found that Legionella pneumophila can still be detected in some air-conditioning cooling towers after cleaning; (3) the specification does not Pre-film treatment after cleaning and disinfection is required, and the surface pre-film can prevent and disperse various scaling ions from scaling, so as to achieve the purpose of anti-corrosion, anti-scaling and preventing the growth of microorganisms (especially Legionella).

Contents of the invention

The purpose of the invention is to provide a scientific, effective and feasible cleaning and disinfection operation procedure for air-conditioning cooling towers, to make up for the uncertainty of WS 396-2012 "Code for Cleaning of Centralized Air-conditioning and Ventilation Systems in Public Places", and to ensure the scientific cleaning of air-conditioning systems and specifications;

The operating procedures for cleaning and disinfection of air-conditioning cooling towers include two steps: on-site investigation and preparation, and cleaning and disinfection operations, as follows:

Step 1: Site survey and preparation

Conduct on-site surveys in the normal operating state of the cooling tower, analyze the actual situation and make a personalized operation plan; surveyors need to take personal protection and wear masks and goggles;

Key points of on-site investigation: (1) check the dirt, algae and corrosion degree of water distributor, packing, tray (water storage tray) and return water filter; (2) understand the situation of cooling tower water replenishment; (3) check water replenishment (4) Understand the corrosion degree of the cooling tower bracket; (5) Check whether the air outlet is aligned with the cooling tower (oil fume will increase the difficulty of cleaning); (6) Write an investigation report or suggestion , Make a plan and prepare suitable cleaning and disinfecting agents, tools and equipment.

The second step: cleaning and disinfection operations

Use the correct shutdown procedure, shut down the cooling tower and set it to manual control; close the fresh air inlet of the air conditioning ventilation system, and close the windows within 30 meters around the cooling tower as much as possible until the cleaning and disinfection are completed, so as to prevent the aerosol generated during the operation from entering Indoors; operators need to do personal protection, wear full-length protective clothing, waterproof boots, impervious gloves, goggles, full or half-face masks (with high-efficiency filtration or chemical adsorption functions to prevent inhalation of pathogenic microorganisms in the air and high concentrations of chlorine);

1 chemical disinfection

(1) Add chlorine-containing disinfectant to the cooling tower. In view of the oxidative degradation characteristics of the disinfectant, calculate the initial free residual chlorine to 50mg/L according to the volume of water in the tower; the chlorine-containing disinfectant should be in the form of quick-release particles or liquid ; If there are serious deposits, the dosage can be appropriately increased; other chemicals such as bactericide and algicide, sludge stripper, oil cleaning agent and defoamer can also be added according to the actual situation; (2) Record the amount added All types of chemical disinfectants, start time of dosing, measure and record free residual chlorine and pH value; (3) Add dispersant active agent within 15 minutes of adding disinfectant to prevent the formation of biofilm; dispersant active agent should be dissolved in water first Add it again, add it in the part where the water flow is fast, which is conducive to rapid diffusion, and the concentration is kept at 1.2-3.0g/L; (4) After adding the chlorine-containing disinfectant and dispersing active agent, circulate the cooling water; within the first 2 hours , monitor the free residual chlorine and pH value once every 15 minutes, add chlorine to keep the free residual chlorine amount above 10mg/L, and keep the pH value at 7.5-8.0; because too high pH value will reduce the biological activity of residual chlorine Efficacy, when the pH value is too high, it can be adjusted with an acid compatible with other chemicals that have been added, such as hydrochloric acid or sulfuric acid; (5) After about 2 hours or after the free residual chlorine is stable at 10mg/L, continue Disinfect for 24 hours, during which the amount of free residual chlorine is monitored every 2 hours to keep it above 10mg/L; ≥10mg/L of free residual chlorine can ensure continuous and effective disinfection effect (6) After continuous disinfection for 24 hours, empty Cooling Tower;

2 mechanical cleaning

Mechanically clean the inner wall of the cooling tower, the air outlet, the fan, and the water distributor, packing, tray, filter screen, water tank and other components through which the water flows, using the principle of top-down; (1) The water distributor uses shovel, (2) The air outlet, fan, filter, and packing (inside and outside) are washed with high-pressure jets; (3) Depending on the degree of silt and the severity of the sludge, the tray and water tank are rinsed after absorbing silt, otherwise, just rinse; (4) After the mechanical cleaning is completed, discharge the sewage;

3 Secondary chemical disinfection

Close the drain valve, fill with cooling water, and perform chemical disinfection according to step "1" again. After disinfection, drain the cooling tower water and fill it up again;

4 Cooling water circulation replacement blowdown

After cleaning and disinfection, use the cooling water circulation pump of the system to circulate for 4~6 hours, drain the sewage, and replace the system with as much water as possible, and stop the sewage when the turbidity drops below 10㎎/L (that is, when the drainage is clear). Fill with new water and prepare for the next step of pre-filming;

5 Dosing and pre-filming and daily maintenance

(1) The pre-film can make a complete and corrosion-resistant protective film pre-formed on the fresh metal surface of the equipment and pipeline after cleaning, especially after chemical cleaning, before putting into normal operation; first add pH value regulator, to adjust the pH value of the system water to 6.5-9.0; Water quality stabilizer, adjust the pH value of the circulating water in the system to 7.0~9.0 to enter daily operation, and take samples for water quality testing; (2) Configure automatic dosing device to make up for the shortcomings of manual dosing; (3) Formulate regular inspections inspection plan;

The effective significance of the present invention: this operating procedure for cleaning and disinfecting air-conditioning cooling towers is the norm for the industry, and in principle requires the cleaning of air-conditioning cooling towers to achieve "on-site investigation-primary disinfection-cleaning-secondary disinfection-replacement sewage discharge-pre-membrane- Daily maintenance" to ensure a good treatment effect, widely used in the cleaning and disinfection of centralized air-conditioning cooling towers in public places; on this basis, the cleaning mechanism can design a targeted operation plan.

detailed description

An operating procedure for cleaning and disinfecting an air-conditioning cooling tower is characterized in that it comprises the following steps:

Step 1: On-site survey and preparation, conduct on-site survey in the normal operation state of the cooling tower, analyze the actual situation and make a personalized operation plan; survey personnel need to take good personal protection, wear masks and goggles; site survey key points: (1) Check the layout Dirt, algae and corrosion degree of water tank, filler, tray (water storage tray) and return water filter; (2) understand the water replenishment situation of the cooling tower; (3) check whether the water replenishment valve and sewage valve are intact or leaking (4) Understand the corrosion degree of the cooling tower bracket; (5) Check whether the exhaust outlet is aligned with the cooling tower (oil fume will increase the difficulty of cleaning); (6) Write a survey report or suggestion, make a plan, and prepare suitable cleaning and disinfection Medicaments, implements and equipment;

Step 2: Cleaning and disinfection operations, use the correct shutdown procedure, close the cooling tower and set it as manual control; close the fresh air inlet of the air conditioning ventilation system, close the windows within 30 meters around the cooling tower as much as possible, until the cleaning and disinfection is completed, to prevent operation Aerosols generated during the process enter the room; operators need to take personal protection, wear full-length protective clothing, waterproof boots, impervious gloves, goggles, all or half-face masks with high-efficiency filtration or chemical adsorption functions;

Step 3: One chemical disinfection,

(1) Add chlorine-containing disinfectant to the cooling tower. In view of the oxidative degradation characteristics of the disinfectant, calculate the initial free residual chlorine to 50mg/L according to the volume of water in the tower; the chlorine-containing disinfectant should be in the form of quick-release particles or liquid ; If there are serious deposits, the amount of dosing can be increased appropriately; other chemicals such as bactericide and algicide, sludge stripper, oil cleaning agent and defoamer can also be added according to the actual situation;

(2) Record the types of all chemical disinfectants added, the start time of dosing, measure and record the free residual chlorine and pH value;

(3) Add the dispersing active agent within 15 minutes of adding the disinfectant to prevent the formation of biofilm; the dispersing active agent should be dissolved in water before adding, and added to the part with rapid water flow, which is conducive to rapid diffusion, and the concentration should be kept at 1.2-3.0 g/L;

(4) After adding the chlorine-containing disinfectant and dispersant active agent, circulate the cooling water; within the first 2 hours, monitor the free residual chlorine and pH value every 15 minutes, add chlorine to keep the free residual chlorine at 10mg/L Above, while maintaining the pH value at 7.5-8.0; because the excessively high pH value will reduce the biological effectiveness of residual chlorine, when the pH value is too high, it can be adjusted with an acid compatible with other chemicals that have been added, such as hydrochloric acid or sulfuric acid;

(5) After about 2 hours or after the amount of free residual chlorine is stabilized at 10mg/L, continue disinfection for 24 hours, during which the amount of free residual chlorine is monitored every 2 hours to keep it above 10mg/L; ≥10mg/L free The amount of residual chlorine can ensure continuous and effective disinfection effect;

(6) After continuous disinfection for 24 hours, empty the cooling tower;

Step 4, mechanical cleaning, mechanically clean the inner wall of the cooling tower, the air outlet, the fan, and the water distributor, packing, tray, filter screen, water tank and other components through which the water flows, using the principle of top-down;

(1) The water distributor shall be cleaned by shoveling and flushing according to the specific situation;

(2) The air outlet, fan, filter, and packing (inside and outside) are washed with high-pressure jets; (3) The trays and water tanks are cleaned according to the degree of silt and the severity level, after absorbing the silt, otherwise just wash it;

(4) After the mechanical cleaning is completed, discharge the sewage;

Step 5, chemical disinfection for the second time, close the drain valve, fill with cooling water, perform chemical disinfection according to step "Step 1" again, empty the cooling tower water after disinfection and fill it up again;

Step 6: Cooling water circulation replacement and sewage discharge. After cleaning and disinfection, use the system cooling water circulation pump to circulate for 4~6 hours. To discharge sewage, drain and replenish water as much as possible for system replacement. When the turbidity drops below 10㎎/L, that is When the drainage is clear, stop the sewage, fill with new water, and prepare for the next step of pre-filming;

Step 7, dosing pre-film and daily maintenance,

(1) The pre-film can make a complete and corrosion-resistant protective film pre-formed on the fresh metal surface of the equipment and pipeline after cleaning, especially after chemical cleaning, before putting into normal operation; first add pH value regulator, to adjust the pH value of the system water to 6.5-9.0; Water quality stabilizer, adjust the pH value of the system circulating water to 7.0-9.0 to enter daily operation, and take samples for water quality testing;

(2) Equipped with a fully automatic dosing device to make up for the shortcomings of manual dosing;

(3) Formulate a regular inspection plan.

Claims (1)

1. A kind of operating procedure of air-conditioning cooling tower cleaning and disinfection, it is characterized in that comprising the following steps: Step 1: On-site survey and preparation, conduct on-site survey in the normal operation state of the cooling tower, analyze the actual situation and make a personalized operation plan; survey personnel need to take good personal protection, wear masks and goggles; site survey key points: (1) Check the layout Dirt, algae and corrosion degree of water tank, filler, tray (water storage tray) and return water filter; (2) understand the water replenishment situation of the cooling tower; (3) check whether the water replenishment valve and sewage valve are intact or leaking (4) Understand the corrosion degree of the cooling tower bracket; (5) Check whether the exhaust outlet is aligned with the cooling tower (oil fume will increase the difficulty of cleaning); (6) Write a survey report or suggestion, make a plan, and prepare suitable cleaning and disinfection Medicaments, implements and equipment; Step 2: Cleaning and disinfection operations, use the correct shutdown procedure, close the cooling tower and set it as manual control; close the fresh air inlet of the air conditioning ventilation system, close the windows within 30 meters around the cooling tower as much as possible, until the cleaning and disinfection is completed, to prevent operation Aerosols generated during the process enter the room; operators need to take personal protection, wear full-length protective clothing, waterproof boots, impervious gloves, goggles, all or half-face masks with high-efficiency filtration or chemical adsorption functions; Step 3: One chemical disinfection, (1) Add chlorine-containing disinfectant to the cooling tower. In view of the oxidative degradation characteristics of the disinfectant, calculate the initial free residual chlorine to 50mg/L according to the volume of water in the tower; the chlorine-containing disinfectant should be in the form of quick-release particles or liquid ; If there are serious deposits, the amount of dosing can be increased appropriately; other chemicals such as bactericide and algicide, sludge stripper, oil cleaning agent and defoamer can also be added according to the actual situation; (2) Record the types of all chemical disinfectants added, the start time of dosing, measure and record the free residual chlorine and pH value; (3) Add the dispersing active agent within 15 minutes of adding the disinfectant to prevent the formation of biofilm; the dispersing active agent should be dissolved in water before adding, and added to the part with rapid water flow, which is conducive to rapid diffusion, and the concentration should be kept at 1.2-3.0 g/L; (4) After adding the chlorine-containing disinfectant and dispersant active agent, circulate the cooling water; within the first 2 hours, monitor the free residual chlorine and pH value every 15 minutes, add chlorine to keep the free residual chlorine at 10mg/L Above, while maintaining the pH value at 7.5-8.0; because the excessively high pH value will reduce the biological effectiveness of residual chlorine, when the pH value is too high, it can be adjusted with an acid compatible with other chemicals that have been added, such as hydrochloric acid or sulfuric acid; (5) After about 2 hours or after the amount of free residual chlorine is stabilized at 10mg/L, continue disinfection for 24 hours, during which the amount of free residual chlorine is monitored every 2 hours to keep it above 10mg/L; ≥10mg/L free The amount of residual chlorine can ensure continuous and effective disinfection effect; (6) After continuous disinfection for 24 hours, empty the cooling tower; Step 4, mechanical cleaning, mechanically clean the inner wall of the cooling tower, the air outlet, the fan, and the water distributor, packing, tray, filter screen, water tank and other components through which the water flows, using the principle of top-down; (1) The water distributor shall be cleaned by shoveling and flushing according to the specific situation; (2) The air outlet, fan, filter, and packing (inside and outside) are washed with high-pressure jets; (3) The trays and water tanks are cleaned according to the degree of silt and the severity level, after absorbing the silt, otherwise just wash it; (4) After the mechanical cleaning is completed, discharge the sewage; Step 5, chemical disinfection for the second time, close the drain valve, fill with cooling water, perform chemical disinfection according to step "Step 1" again, empty the cooling tower water after disinfection and fill it up again; Step 6: Cooling water circulation replacement and sewage discharge. After cleaning and disinfection, use the system cooling water circulation pump to circulate for 4~6 hours. To discharge sewage, drain and replenish water as much as possible for system replacement. When the turbidity drops below 10㎎/L, that is When the drainage is clear, stop the sewage, fill with new water, and prepare for the next step of pre-filming; Step 7, dosing pre-film and daily maintenance, (1) The pre-film can make a complete and corrosion-resistant protective film pre-formed on the fresh metal surface of the equipment and pipeline after cleaning, especially after chemical cleaning, before putting into normal operation; first add pH value regulator, to adjust the pH value of the system water to 6.5-9.0; Water quality stabilizer, adjust the pH value of the system circulating water to 7.0-9.0 to enter daily operation, and take samples for water quality testing; (2) Equipped with a fully automatic dosing device to make up for the shortcomings of manual dosing; (3) Formulate a regular inspection plan.