The Exhaust gas economiser in a ship is like a huge heat exchange that exchanges heat between exhaust gas from engines to water and produces steam for the same purpose that auxiliary boilers produce steam.
Steps for Prevention of Fire
What is the correct procedure to extinguish a Soot fire in the exhaust gas boiler?
Raise water level full and blow down continuously so as to maintain good flow of water. Reduce boiler pressure by easing gear. Spray water on the external casing of the uptake to cool the affected area. A few times starting and stopping of main engine should be done to blow out collected soots at the uptake.
What is the purpose of exhaust gas boiler?
Exhaust gas boilers recover the heat from the exhaust gas of auxiliary diesel engines to generate steam and/or hot water, or useful heat for process heating. Depending on system design, these boilers can enhance the efficiency of the auxiliary engine system by up to 20%, leading to lower overall process costs.
A sootblower is a device for removing the soot that is deposited on the internal furnace tubes of a boiler during combustion to prevent plugging of the gas passes and maintain boiler efficiency.
Scrubbers are used by ship operators globally. Ship Insight cites in a scrubber, “the sulfur oxides in the exhaust are passed through a water stream reacting with it to form sulfuric acid and are removed from the exhaust gas which then passes out of the system.” As an engine on a ship operates, it creates exhaust.
How does a soot blower work?
A soot blower works by directing a high-pressure jet of steam, water or air through nozzles onto the cleaning surfaces, thus preventing a deposit build up which would adversely affect the heat transfer efficiency of the heat exchanger. Air, water and steam are the most commonly used cleaning mediums.
What state is the soot blower in when not in use?
7. In which state would be the soot blower when it’s not in use? Explanation: When not in use the soot blower tube of the system would be dry and uncooled, and subject to gas temperatures.
Scrubbers or Exhaust Gas Cleaning Systems (EGCS) are used to remove particulate matter and harmful components, such as sulphur oxides (SOx) and nitrogen oxides (NOx) from the exhaust gasses generated as a result of combustion processes in marine engines, to implement pollution control.
How Much Does A Ride Automatic Scrubber Cost?
Size Price Range Small 20”- 24” $7,000 – $10,000 Mid 26”- 34” $9,900 – $23,000 Large 34”- 45” $23,000 – $30,000What are the supervisory controls of a soot blower?
The supervisory controls of soot blowers should ensure that soot blowing does not commence until all the soot blower steam distribution system has reached its working temperature and all condensate has been removed. On completion of the operation, complete shut-off of the steam supply should be assured and drains opened.
What are the different types of soot blowers?
Various types of soot blowers such a wall blowers, long retractable blowers and air heater blowers are used for cleaning. Steam is normally used as a medium for blowing away the soot. The soot which sticks to the heating surface insulates them from the heat, efficiency soot must be blow off to maximize heat transfer in the boiler.
Properly adjusted soot blowers remove the soot from between the tubes of superheaters. In practice, they are frequently found to be directed at the tube surface. Condensed water droplets, possibly with entrained fly ash particles, have an abrasive effect and cause accelerated oxidation of the steel.
To prevent soot blowers causing erosion problems, the position of the nozzles and the blow direction must be periodically inspected. Use of superheated steam or effective water separation in the steam line can prevent the presence of water droplets in the steam.