【Q&A Question 254】2018.09.17
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【Q&A Question 254】September 17, 2018: Briefly explain under what circumstances furnace drying is necessary, and what is the purpose of it. Furnace drying is required before a furnace is put into use for the first time, or after it has undergone major repairs. The purpose is to remove moisture from the refractory materials—both surface moisture and crystalline water—through slow and uniform heating, thereby preventing damage to the furnace walls due to rapid evaporation of moisture when the temperature rises suddenly, which could lead to extensive cracking and detachment of the furnace walls. . (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
Newly built furnaces, or those that have undergone major repairs, need to be dried out, with the aim of removing free water and condensed water from the lining, as well as preventing sintering of the lining
For newly installed boilers or those that have undergone major repairs and modifications, the furnace walls, roof, and front and rear arches are either newly constructed or rebuilt; within these furnace walls, the refractory concrete and plaster layers contain a large amount of moisture. The purpose of boiler drying is to bring the furnace walls to a certain level of dryness, thereby preventing cracks in the furnace walls due to uneven expansion that occurs when the walls become wet and are suddenly exposed to heat during operation ； Furnace drying can also achieve a better strength in the grout between the furnace walls, thereby enhancing their resistance to high temperatures ； It is also a check on the tightness of the furnace wall construction quality.
The process of lighting a fire to dry the furnace body before putting a newly built heating furnace into operation is called furnace drying, and it is usually carried out according to a specified temperature rise curve. (1) The purpose of drying the furnace is to remove the free water and crystalline water from the lining, so as to prevent excessive expansion of water when the furnace temperature rises rapidly during startup, which could cause the furnace body to crack, bulge, deform, or even have its walls collapse, thereby affecting the strength and service life of the furnace’s walls. (2) Further familiarize oneself with the performance of the instruments in the furnace area, and test whether they meet the production requirements. (3) Evaluate the performance of various furnace components under hot conditions. (4) Conduct on-the-job training to improve operational skills.
Once the boiler and its piping system have been installed, a drying process must be carried out before putting it into operation, in order to remove the free water and crystalline water from the lining. This is necessary to prevent the boiler from cracking, bubbling, deforming, or even having its walls collapse due to the rapid increase in temperature at startup, as this could affect the strength and service life of the boiler’s walls. Further familiarize oneself with the performance of the instruments in the furnace area, and test whether they meet the production requirements. Evaluate the performance of various furnace components under hot conditions.
1. Heating furnaces with new linings or those requiring extensive lining replacement； 2. By using slow heating, self-igniting water and crystalline water in the furnace’s insulating refractory materials are gradually removed, and the refractory materials are sintered; this prevents moisture present in the lining from not being able to be removed in time during normal operation, which could otherwise cause vaporization and expansion that damages the furnace.
1. Both newly built furnaces and those that have undergone major repairs need to be baked out. 2. Purpose: (1) The purpose of drying the furnace is to remove the free water and crystalline water present in the lining, so as to prevent excessive expansion of water when the furnace temperature rises rapidly during operation; this could otherwise cause the furnace body to crack, bulge, deform, or even have its walls collapse, thereby affecting the strength and service life of the furnace’s walls. (2) Further familiarize oneself with the performance of the instruments in the furnace area, and test whether they meet the production requirements. (3) Evaluate the performance of various furnace components under hot conditions. (4) Conduct on-the-job training to improve operational skills.
1 Newly built or renovated heating furnaces require drying out. 2 The purpose of heating the furnace is to dry and sinter the surface water and crystalline water in the lining material inside the furnace, thereby preventing damage to the heating furnace during use
Answer: Oven drying is necessary before a furnace is put into use for the first time, or after it has undergone major repairs. The purpose of this process is to remove moisture from the refractory materials – including surface moisture and crystalline water – in a slow and uniform manner through heating. This helps to prevent damage to the furnace walls caused by rapid evaporation of moisture inside them when the furnace starts operating, which could lead to expansion and large-scale detachment of those walls.
Before a furnace is newly built and put into use, or after it has undergone major repairs, it is necessary to carry out furnace drying. The purpose of this is to remove the moisture contained in the refractory materials – including surface moisture and crystalline water – slowly and evenly through heating. This prevents excessive expansion of the moisture due to a rapid rise in furnace temperature at the time of operation, which could cause the furnace structure to crack, bulge, deform, or even have its walls collapse. Such issues can affect the strength and service life of the furnace’s walls.
Once the boiler and its piping system have been installed, drying operations must be carried out before putting it into operation； The purpose of heating the furnace is to remove the free water and crystalline water from the lining, so as to prevent excessive expansion of water when the furnace temperature rises rapidly at startup, which could cause the furnace body to crack, bulge, deform, or even have its walls collapse. This would affect the strength and service life of the furnace’s walls.