Chlorine neutralization tower

Chlorine-neutralization-tower

CHLORINE GAS NEUTRALIZATION TOWER LEAKS

Chlorine gas is highly toxic to humans and the environment. Therefore, workplace safety measures are crucial, and handling chlorine gas leaks in chlorine dosing systems and chlorine houses is very important and necessary for all water treatment plants.

Chlorine gas is highly toxic, so workplace safety measures are essential. Handling chlorine gas leaks in chlorine dosing systems and chlorine houses is very important and necessary for all water treatment plants.

For small chlorine leaks, operators can use specialized chlorine gas masks or compressed air breathing devices to detect and address leaks on-site (using specialized tools) or immediately close the chlorine valve at the chlorine storage tank to isolate the leaking chlorine supply.

However, for more serious incidents causing large-scale leaks and dispersion, such as ruptured tanks, broken valve stems, or burnt lead seals, simple methods cannot be used. Even in areas where chlorine vapor is released, with a high concentration of chlorine in the air, standard protective equipment for operating personnel is insufficient for prolonged handling of the incident. Direct contact with equipment in chlorine rooms and controlling chlorine vapor leaks is extremely difficult.

In the case of a 65kg or even 1000kg chlorine cylinder leaking chlorine vapor (in a 1-ton container), it will cause very serious environmental incidents, especially in nearby residential areas, resulting in significant material damage (chlorine corrosion when in contact with water) and loss of human life.

To address these emergencies, decades ago, people commonly used lime pits. In necessary cases, leaking chlorine containers (older types, weighing 50-200 kg) would be lowered into the lime pit. However, this is not a suitable solution for current conditions. In emergencies, lowering a 1000 kg container into a lime pit manually is impossible due to its excessive weight, lack of readily available equipment, and complex system constraints that operators cannot handle in an emergency.

1. The system only addresses minor leaks to flush out chlorine vapor. In emergency situations with excessive chlorine release, the spray system will react with water to form hydrochloric acid (HCl). This acid will damage the chlorine dosing system, chlorine storage tanks, machinery, and surrounding equipment, impacting the surrounding environment.

   
   

   Currently, during the consulting process, all consulting companies advise and include solutions for neutralizing chlorine leaks in water treatment plant projects, making it an indispensable component.

   
   

   The chlorine leak neutralization system is designed to operate fully automatically. The chlorine dosing equipment house must be airtight, equipped with ventilation fans, and have a chlorine leak sensor connected to a central control unit located in the electrical cabinet.

   
   

   Chlorine is heavier than air, so chlorine leaks will remain close to the ground. Chlorine vapor leaks will be quickly absorbed by the chlorine vapor exhaust fan of the neutralization system, with a capacity of 3000 m³/h to 4000 m³/h, through the neutralization tower.

   
   

   The neutralization tower is calculated and designed for chlorine neutralization. It includes a system for evenly distributing chemicals and contact materials (with appropriate porosity, size, and height) to increase the contact surface area and ensure thorough chlorine neutralization.

   
   

   Inside the neutralization tower, chlorine vapor is neutralized by a caustic soda solution (20% NaOH) pumped from a chemical pump, forming a salt solution (NaCl). The air is then purified with an efficiency of 98-99%, and the solution is released directly into the atmosphere through the ventilation duct.

   
   

   The neutralized salt solution (NaCl) is discharged into the plant's drainage system, ensuring compliance with environmental standards. The sodium hydroxide (NaOH) in the storage tank will be drained and replaced after each chlorine leak to ensure the chemical's activity and the neutralization system's effectiveness.

   
   

   The entire chlorine neutralization tower and chemical pump are located on a sodium hydroxide (NaOH) chemical storage tank used for neutralizing chlorine. The entire system must be designed using chlorine-resistant materials such as PVC, PP, and FPR. This ensures the system's operational efficiency and lifespan.

   
   

   The rapid and thorough removal and neutralization of leaked chlorine by the chlorine leak neutralization system helps to quickly reduce the chlorine concentration in the affected area, facilitating more effective operator intervention and minimizing damage to machinery and personnel.

   
   

   Emergency chlorine vapor neutralization systems are the safest solution that designers, managers, and operators of water disinfection dosing systems are very interested in to avoid losses of property and lives whenever excessive chlorine leaks occur.

   
   

   The chlorine leak neutralization system consists of 6 main components:

   
   

   Chlorine leak detection sensor

   
   

   Chlorine gas measurement range: 0…10,000 ppm

   
   

   Output 0/4…20 mA, relay output for control

   
   

   Power supply: 230 V AC, 50/60 Hz

   
   

   Protection class: IP65

   
   

   Manufacturer/Origin: Germany

   
   

   Control cabinet Dimensions: Height: 800 mm Width: 600 mm Origin: Vietnam NaOH (10%) chemical pump

   
   

   Model: SD40022EBH –CCH

   
   

   Flow rate: 200 l/min @ 14 mAq

   
   

   Material: FRP

   
   

   Motor: 2 HP, 380 V, 3 phase, 50 Hz

   
   

   NaOH solution maintains a pH of approximately 11

   
   

   Manufacturer/Origin Origin: Super/Taiwan

   
   

   Chlorine Leak Extraction Fan

   
   

   Model: EUMc451

   
   

   Air Flow Rate: 4000 CMH @ 200mmAq

   
   

   Motor: 5HP, 380V/3Ph/50/4P, Teco

   
   

   Indirect drive via door

   
   

   Inner and impeller: SUS 304

   
   

   Chlorine Neutralization Tower

   
   

   Gas Processing Capacity: 3000-4000 CMH

   
   

   Diameter: 800 mm

   
   

   Packing Layer Height: 2000 mm

   
   

   Tower Height: 3800 mm

   
   

   Material: FRP, 5-6 mm thick

   
   

   Chemical Storage Tank: Volume: 2m³ Dimensions: Height: 1200 mm Width: 800 mm Length: 2200 mm Material: FRP, 5-6 mm thick The chemical storage tank is fixed to the tower In the chlorine room:

   
   

   Operating principle: When chlorine leaks into the air (in the chlorine room), the leak detection sensor records the value and sends it to the central processing unit. Here, the value is compared with the operator's set value (usually 0.2 – 2 ppm). If it exceeds the set threshold, the central processing unit will send a signal to the control panel. Upon receiving the signal from the central processing unit, the control panel will close the contacts to activate the NaOH (20%) neutralization chemical pump. The alarm and warning lights will simultaneously turn on, and the fan will run for a set period, usually 5 to 10 seconds, to allow the pump to evenly distribute the NaOH solution. The process of chlorine removal and NaOH neutralization continues until the chlorine level in the air (in the chlorine room) falls below the set level. Once the chlorine gas is completely removed, the central processing unit will send an electrical signal to the control panel, opening the contacts for the leak-extracting chlorine fan, pumping the neutralizing chemical NaOH (20%), and turning off the alarm siren and lights. After each system run, the entire amount of NaOH in the tank must be replaced.

   
   

   MANUFACTURER

THÁP TRUNG HÒA 1000 KG CLO

THÁP TRUNG HÒA 1000 KG CLO

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