The key tasks of the overhaul and renovation of the desulfurizing tower are: dismantling the old ammonia spray head, setting up the scaffolding, sandblasting and derusting, and spraying glass scales. Scaffold collapse, high-altitude fall, object strike, electric shock, gas poisoning and fire accident are easy to happen in reconstruction project, so it is necessary to double the pre-control measures to ensure the safety of operation.
Among them, causing the danger point of gas poisoning: Desulfurization Tower anti-corrosion spraying is the use of vinyl flake special paint. The chemical composition of the paint are: Styrene, dibutyl maleate, hydrodesulfurization heavy naphtha. Workers exposed to styrene at concentrations of 100 mg / m 315 min or 50 min / m 38 h were found to be irritating to eyes and skin, causing inflammation of mucous membranes and respiratory system and serious injury to kidneys, liver and central nervous system.
GAS POISONING MAY OCCUR IF:
1. Ventilation measures not in place, poor ventilation;
2. Anti-corrosion spray workers do not wear activated carbon and particulate filter equipment, protective gloves, protective glasses, etc. .
3. The anti-corrosion spray operation personnel is excessive, the concentration exceeds the standard;
4. There's a lot of paint in the tower.
Safety precautions
Site Safety Arrangement: Before the start of work on the desulfurization tower overhaul site all with isolation fence isolation, leaving only one exit have safety management personnel in charge of access management. According to the layout of fgd area maintenance plan, the maintenance materials and tools should be stored, and the articles should be put in order. Inspect and clean the interior for inflammable materials. The manhole of the desulfurization tower is provided with a self-luminous indicator lamp. The power switch of the electric appliance is arranged outside the Absorption Tower and is provided with a clear sign. The electric welding machine and the power box are well rainproof. The electric welding machine is reliably grounded and equipped with leakage protector. Reliable electrostatic grounding of desulfuration tower has been implemented. low-voltage explosion-proof lamps are used for internal lighting of desulfuration tower. A Guardian is arranged on the outer side of the manhole door of the operating surface of the desulfurizing tower, and the Guardian is increased or decreased during the anticorrosion spraying operation. The oxygen bottle acetylene bottle is fixed in the upright position, the shock-proof ring is complete, the distance of the oxygen bottle is 8m, the distance of the open flame is 10m. Remove the top exhaust valve and install the fan to feed gas into the tower. Install the fan to exhaust gas into the absorber in the middle and bottom manhole doors of the desulfurizer. The scaffold is safe and firm and meets the safety standard. In the middle and top of the desulfurization tower, near the manhole door of the anti-corrosion spray working surface and the mist eliminator, the temporary fire water pipe is connected and equipped with the fire alarm device. The fire water valve is responsible for ensuring that it is always easy to use and the fire water pressure is normal, we're ready to go. The inner working surface of the desulfurizing tower and the outer door of the manhole have enough dry powder fire extinguishers, and the used fire-fighting equipment can be replaced at any time. During hot work, the working surface platform, between the mist eliminator paved with fire blanket, sealed tightly. Pre-control measures in the process of repair: every day before a good class meeting, found that the dress does not meet the requirements, mental fatigue, drinking personnel prohibited to enter the repair site work. Combined with the daily work of all the overhaul personnel seriously for security technology disclosure, the disclosure must be signed in the signature column, so that "work tasks clear, dangerous points clear, clear operating procedures, clear security measures. ". Before the overhaul work, the Safety Officer inspects the personal safety protective equipment, the safety device comprehensively. In view of the high-risk operation of fgd tower maintenance, safety management, safety and control measures should be carefully formulated and strictly implemented to ensure the safety and smooth maintenance work.
