Boiler blowing refers to the operation of blowing, cleaning, and inspecting some pipelines inside the boiler during operation. The following are the precautions for boiler blowing: 1. Preparation before operation
1. Personnel preparation: Personnel participating in the blowing operation must be familiar with the operating procedures and blowing process of the boiler, possess relevant professional knowledge and skills, and hold relevant certificates for operating the boiler. The entire process of blowing pipes should have professional personnel in charge of supervision, commissioning, construction, production, etc. to ensure the safe and smooth progress of boiler blowing work.
2. Equipment inspection: Check the integrity of the blowing equipment (including blowing pipes, blowing fans, blowing valves, etc.) to ensure their normal operation. If there is a malfunction or abnormal situation, the equipment should be repaired or replaced in a timely manner.
3. Tool preparation: Check if the necessary tools and work equipment for blowing pipes are complete, including protective gloves, goggles, earplugs, work tools, etc.
4. Safety inspection: Relevant departments or personnel should be notified in advance before blowing pipes to ensure safety coordination and cooperation among all parties. And check the operation of the boiler, including pressure, temperature, flue gas composition, water level, furnace condition, etc. 2、 Blowing operation
1. Water supply quality: During the blowing period, the boiler water supply quality must be qualified.
2. Feed water temperature: Heat the deaerator and increase the feed water temperature as much as possible.
3. Fuel control: Activate the lower burner to maintain good combustion. Reasonably control the fuel quantity to avoid overheating, and have foresight for changes in the water level in the storage tank.
4. Boost control: During the boost period, the boiler's boost rate is limited to the corresponding saturation temperature change rate, which cannot exceed the limit value.
5. Temperature monitoring: If the blowing scheme adopts staged blowing (referred to as the "two-step method"), when blowing the superheater system separately, cooling cannot be obtained because there is no working fluid passing through the reheater system at this time. To protect the safety of the reheater system, a smoke temperature probe should be activated to control the smoke temperature at the furnace outlet to not exceed a certain temperature. Closely monitor the wall temperature of the furnace water-cooled wall, superheater, and reheater, and ensure that it does not exceed the corresponding limit values.
6. Air preheater soot blowing: After ignition, promptly activate the air preheater soot blowing and closely monitor the smoke temperature in the air preheater area.
7. Slowly open: Before blowing the pipe, slowly open the temporary control door to warm and drain the system to prevent water hammer.
8. Step by step blowing: To improve the blowing effect, oxygen blowing can be considered. At the same time, it is necessary to avoid the impact caused by excessive expansion due to one-time blowing of the tube, and a step-by-step and gradual blowing method should be adopted. 3、 Safety precautions
1. Personal protection: Wear personal protective equipment such as heat-resistant gloves, protective goggles, protective shoes, etc. For pipe blowing operations in high-temperature and high-pressure environments, it is necessary to wear fire-resistant clothing and boots.
2. Standing safety: When blowing pipes, stand firmly in a safe position and do not cross isolation facilities to prevent falls or other accidents.
3. Do not approach: During the blowing operation, others are not allowed to approach the blowing area to avoid being injured by the high temperature and high pressure airflow during blowing. During the blowing process, personnel are strictly prohibited from approaching valves, manhole doors, safety doors, inspection holes, and explosion-proof doors.
4. Stay alert: During the blowing process, it is necessary to remain alert and not be influenced by substances such as alcohol and drugs.
5. Toxic substance treatment: There may be toxic and harmful substances in the blowing furnace pipeline, which must be protected and treated according to relevant regulations, and direct contact is strictly prohibited.
6. No open flames: During the blowing process, the use of sparks or open flames should be strictly prohibited to avoid causing fires.
7. Observing instruments: During the blowing process, it is necessary to regularly observe the instruments and pay attention to the operation of the boiler. Once an abnormal situation is discovered, the blowing operation should be stopped immediately and reported to the relevant department in a timely manner.
8. Warning: There should be no flammable or explosive materials around the blowing pipeline. There should be no people within 50 meters of the exhaust outlet (muffler), and warning lines and lights should be set up around it. A dedicated person should be on duty 24 hours a day to guard and prohibit unrelated personnel from staying at the blowing pipe site. 4、 Check after blowing the tube
After the blowing process is completed, the blowing equipment and pipelines should be inspected to confirm that there are no residues or abnormal conditions before shutting down the equipment and pipelines.
Boiler pipe blowing is a complex and important operation that requires strict adherence to various precautions to ensure the safety and effectiveness of the operation.