[Q&A Question 253] 2017.09.11
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This post was last edited by liuquan1100 on 2017-9-11 08:23. [Q&A Question 253] 2017.09.11: Methods for dealing with liquid in the steam generator. (Unless otherwise specified, all Q&A questions are based on hydrogenation units.) ) The answers to the daily questions change, and today’s answers are shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please access it through the summary post below. Summary post of Q&A questions for 2017 (updating now): http://bbs.hcbbs.com/thread-1657793-1-1.html Summary post of daily questions for 2017 (updating now): http://bbs.hcbbs.com/thread-1657794-1-1.html Summary post of Q&A questions for 2016 (already updated): http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum) [Q&A Question No. 248] September 6, 2017: What is the impact of the oxygen content in flue gas on the efficiency of heating furnaces? A high oxygen content in the flue gas leads to an increase in the amount of air entering the furnace, which reduces the furnace temperature and affects heat transfer. At the same time, an increased volume of flue gas results in more heat being carried away, thereby reducing the efficiency of the heating furnace. A low oxygen content in the flue gas causes incomplete combustion of the fuel, again leading to a decrease in the heating furnace’s efficiency. 【Q&A Question 249】 September 7, 2017: Briefly describe the impact of the properties of the feed oil in hydrogenation units on the temperature rise in the reactor. Taking diesel hydrogenation as an example, when there is a large amount of catalytic diesel and cokered gasoline/diesel, the feedstock contains more unsaturated components; as a result, more heat is released during the reaction, leading to a greater increase in temperature. 【Q&A Question 250】 September 8, 2017: What type of water is used in the compressor’s water tank? What is the purpose of a replacement water tank? Deoxygenated water or demineralized water. It reduces the acid value of the water tank, purifies the water quality, and removes impurities, thereby enabling better heat exchange and reducing corrosion of the pipelines by water. 【Q&A Question 251】 September 9, 2017: What are the reasons for the increase in temperature of the motor in pumps (compressors)? (1) Excessive axial play in the pump shaft. (2) The load on the pump increases. (3) High temperature of the motor bearings. 【Q&A Question 252】 September 10, 2017: What are the purposes of fixed drainage and continuous drainage in a drum? Drainage from the steam drum can be divided into periodic drainage and continuous drainage based on the operation time. Fixed drainage means removing the sludge and dirt accumulated at the bottom of the boiler at regular intervals. It enables uniform concentration of the drum water, which helps to improve the quality of steam. Series connection is used to prevent excessive salt and sulfur content in the boiler water, while blowdown is carried out where the concentration of boiler water is most pronounced.
(1) First, remove the heat source from the steam generator to allow it to cool down； (2) Open the steam vent valve to release the steam from the pipeline network ； (3) Wait until the temperature of the steam generator drops, then add water to the drum to reach the normal liquid level, and restart it following the normal startup procedure ； (4) When the liquid level is low, never add water to the drum immediately to avoid accidents caused by boiling over.
(1) First, remove the heat source from the steam generator to allow it to cool down； (2) Open the steam vent valve to release the steam from the pipeline system ； (3) Wait until the temperature of the steam generator drops, then add water to the drum to reach the normal liquid level, and restart it following the normal startup procedure ； (4) When the liquid level is low, never add water to the drum immediately to avoid boiling over and resulting accidents.
Lower the furnace temperature and divert the generated steam to vent; resume its use once the temperature of the steam generator has dropped. Prevent bumping at all costs.
Lower the furnace temperature and divert the generated steam to vent; resume its use once the temperature of the steam generator has dropped. Prevent bumping at all costs.
(1) First, remove the heat source from the steam generator to allow it to cool down； (2) Open the steam vent valve to release the steam from the pipeline network ； (3) Wait until the temperature of the steam generator drops, then add water to the drum to reach the normal liquid level, and restart it following the normal startup procedure ； (4) When the liquid level is low, never add water to the drum immediately to avoid accidents caused by boiling over.
(1) First, isolate the heat source from the steam generator to allow it to cool down; (2) Open the steam vent valve to release the steam from the piping system; (3) Once the temperature of the steam generator has dropped, add water to the steam drum until it reaches the normal liquid level, and then restart it following the standard startup procedure; (4) Be careful not to add water to the steam drum immediately when the liquid level is low, to avoid accidents caused by sudden boiling.
(1) First, remove the heat source from the steam generator to allow it to cool down； (2) Open the steam vent valve to release the steam from the pipeline network ； (3) Wait until the temperature of the steam generator drops, then add water to the drum to reach the normal liquid level, and restart it following the normal startup procedure ； (4) When the liquid level is low, never add water to the drum immediately to avoid accidents caused by boiling over.
Answer: (1) First, isolate the heat source from the steam generator to allow it to cool down； (2) Open the steam vent valve to release the steam from the pipeline network ； (3) Wait until the temperature of the steam generator drops, then add water to the drum to reach the normal liquid level, and restart it following the normal startup procedure ； (4) When the liquid level is low, never add water to the drum immediately to avoid accidents caused by boiling over.
(1) First, remove the heat source from the steam generator to allow it to cool down； (2) Open the steam vent valve to release the steam from the pipeline network ； (3) Wait until the temperature of the steam generator drops, then add water to the drum to reach the normal liquid level, and restart it following the normal startup procedure ； (4) When the liquid level is low, never add water to the drum immediately to avoid accidents caused by boiling over.
1) First, remove the heat source from the steam generator to allow it to cool down； (2) Open the steam vent valve to release the steam from the pipeline network ； (3) Wait until the temperature of the steam generator drops, then add water to the drum to reach the normal liquid level, and restart it following the normal startup procedure ； (4) When the liquid level is low, never add water to the drum immediately to avoid accidents caused by boiling over.