【Daily Question】Chemical Engineering Principles 342: Boiler Shutdown for Maintenance (March 18)
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This post was last edited by “Back to Cambridge” on March 28, 2016, at 13:37. Starting today, the Chemical Engineering Theory section will launch the “Question of the Day” activity to help everyone reinforce their basic knowledge in chemical engineering. Subsequently, series such as “Fundamentals of Chemical Engineering”, “Mass Transfer and Separation”, “Chemical Thermodynamics”, and “Chemical Process Technology” will be introduced. We hope for your active participation! Wishing you all a Merry Christmas~~ For replies to the “Question of the Day” activity, answers can be viewed directly; however, the thread will be closed after one day! ! To encourage everyone’s continued participation this year! You get 3 wealth rewards just for participating, and an additional 4 wealth points for correct answers~~~ Short answer question: What are the basic principles of the protection system for shutting down boilers when they are not in use? Answer: 1. Prevent air from entering the vapor system of the equipment that is not in use; 2. Keep the metal surfaces on the vapor side of the equipment dry, and strictly control the temperature to prevent dew formation. 3. If the interior of the boiler is filled with water or there is a water film on the metal surface, a corrosion inhibitor can be used to put the metal surface into a passivated state or to form a water-impermeable adsorption film.
1. Prevent air from entering the water and steam system of the boiler that is out of service. 2. Keep the metal surfaces of the boilers that are on standby fully dry. 3. Form a protective or adsorptive film on the metal surface that provides corrosion resistance. 4. Immerse the metal surface in an aqueous solution containing a deoxidizer or other protective agent. 5. Fill the standby boiler equipment with an inert gas.
What are the basic principles of the protection system for shutting down a boiler and putting it into standby mode? 1. Prevent outside air from entering the steam and water system of the unused boiler ； 2. Keep the metal surfaces within the soda system dry ； 3. Form a film with anti-corrosion properties on the inner surface of the metal to isolate it from air ； 4. Immerse the metal surface in a medium containing a deoxidizer or other protective agent.
(1) Prevent air from entering the steam system of the boiler that is not in use. (2) Ensure that the metal inner surface of the boiler steam system is dry when it is not in use. (3) Create a film with anti-corrosion properties on the metal surface. (4) Immerse the metal surface in an aqueous solution containing a deoxidizer or other protective agent.
①Prevent air from entering the vapor system of the decommissioned equipment. ②Keep the metal surfaces on the moisture side of the equipment dry, and strictly control the temperature to prevent dew formation. ③If the interior of the boiler is filled with water or there is a water film on the metal surface, a corrosion inhibitor can be used to put the metal surface into a passivated state or to form a water-impermeable adsorption film.
The basic principles for shutdown maintenance are: 1. Prevent outside air from entering the steam and water system of the boiler that is not in use; 2. Keep the metal surfaces within the steam and water system dry； 3. Form a film with anti-corrosion properties on the inner surface of the metal to isolate it from air ； 4. Immerse the metal surface in a medium containing a deoxidizer or other protective agent.
Answer: 1. To prevent air from entering the vapor system of equipment that is not in use. 2. To keep the metal surfaces of the equipment’s vapor system dry, thereby preventing condensation at those temperatures. 3. If the interior of the boiler is filled with water or there is a water film on the metal surfaces, corrosion inhibitors can be used to put the metal surfaces into a passivated state or to form a water-impermeable adsorption layer.
1. Prevent air from entering the steam and water system. 2. Maintain a relative humidity of less than 20% on the inner surfaces of the steam and water system of the boiler that is not in use. 3. Form a passivation film on the inner surfaces of the heated surfaces and associated pipes. 4. Immerses the metal inner surfaces in a protective solution
What are the basic principles of the protection system for shutting down a boiler and putting it into standby mode? Answer: 1. Prevent air from entering the vapor system of the equipment that is not in use; 2. Keep the metal surfaces on the vapor side of the equipment dry, and strictly control the temperature to prevent dew formation. 3. If the interior of the boiler is filled with water or there is a water film on the metal surface, a corrosion inhibitor can be used to put the metal surface into a passivated state or to form a water-impermeable adsorption film.
1. Prevent air from entering the vapor system of equipment that is not in use. 2. Keep the metal surfaces on the vapor side of the equipment dry, and strictly control the temperature to prevent dew formation. 3. If the interior of the boiler is filled with water or there is a water film on the metal surface, a corrosion inhibitor can be used to put the metal surface into a passivated state or to form a water-impermeable adsorption film.
(1) Prevent air from entering the soda system. (2) Maintain the relative humidity on the inner surface of the steam and water system of the shut-down boiler below 20%. (3) A passivation film forms on the heated surface and the inner walls of the corresponding pipes. (4) The metal inner wall is immersed in a protective agent solution.