Three-Character Formula for Operating Gas Stoves”
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Recently, due to changes in coal quality, gas stoves have not been functioning well. As a result, I have spent considerable time thinking about the aspects related to operating fixed-bed gas stoves. In any case, I believe that to operate a gas stove effectively, one must put great effort into the three aspects of “observing, touching, and testing.” For now, I call this the “Three Key Points for Operating Gas Stoves.” Of course, this is not the same as the famous “Three Character Classic”; that classic has already been refined and interpreted by our ancestors and has become an essential part of Chinese traditional culture. Given that there are many experts in this field, including specialists in gas stoves, I propose that we all use these “Three Key Points” as a basis for sharing our ideas. I will start by offering my own thoughts; if there are any mistakes, they can be discussed. As the saying goes, “It is through debate that improvement occurs.” Let’s first talk about the aspect of “observing.” Although the concept of “observing” may not seem particularly profound, the knowledge, skills, and experience involved in operating a gas stove are indeed very extensive. Anyone who has operated or managed a gas stove knows that, in this context, “observing” refers to looking at all the indicators related to the operation of the stove, in order to assess its condition and make adjustments to bring it to its optimal state. For example, by examining the slag – using observation and analysis of the quality of the ash and slag to determine the gasification conditions inside the furnace – is one of the essential methods for those involved in coal gas production using the fixed-bed batch process. Mastering the ability to identify and analyze the quality of ash is of great significance for guiding the proper operation of gas furnaces, making process adjustments, and assessing furnace conditions. As is well known, slag is the final product of the conversion of raw materials in fixed-bed gasifiers, and the quality of this slag reflects the efficiency with which carbon is utilized. Therefore, the quality of ash and slag is one of the main references for gas furnace operators to assess the gasification conditions inside the furnace and to make adjustments to the operating process. In daily production, we often conduct rational analysis based on our visual inspection of the surface condition of the ash and slag, in order to indirectly evaluate the gasification status of the gas furnace. To optimize the operating parameters of the gas furnace to the best possible level, it is necessary to carry out thorough observation and analysis of the quality of the ash and slag at a deeper level. For example, by conducting a thorough analysis of aspects such as the color of the ash, the ash formation rate, carbon reversion, hardness, particle size, melting state, temperature, etc., it is possible to determine the condition of the gas furnace and whether the process adjustments made are appropriate. By combining this analysis with assessments of other indicators, targeted process adjustments can be carried out. It can be said that the level of competence of the managers and operators of fixed-bed batch gas furnaces is reflected in their ability to analyze the condition of ash and slag. Improving this ability to analyze ash and slag is a process of accumulating experience through careful observation, in-depth analysis, and thorough summarization. Given the variations in the characteristics of gas production units, the conditions of raw materials, and related gasification parameters, it can be said that each furnace and each plant presents its own unique situation. Operators of gas furnaces should, based on the actual conditions of their company’s gas production system, develop an ideal model for the quality of ash and slag, using this standard as a guide for the operators’ efforts. Well, it seems that the principle of “looking” is indeed very important, right? Of course, the above discussion is merely an introduction; many specific details regarding the act of “observing” need to be added by everyone through their comments! The terms “touch” and “insert” are particularly problematic; please discuss them! :handshake :handshake :handshake Last edited by ddfmy on 2009-2-6 12:06 ]
No one is there to take it; sit on the sofa by yourself. When discussing such issues, there’s no need to write long explanations; offering just one or two suggestions is the greatest form of support. For example: (Or use the word “look”, haha:lol) If, when examining the slag, many pieces with fractured surfaces resulting from compression are found, it indicates that there were large pieces of slag or scabs inside the furnace. This post was last edited by ddfmy on 2009-2-6 17:03]
With low steam consumption or high downward steam flow, black hard lumps are likely to form; smaller coal particles result in lower consumption.
In response to the user above, especially when using coal with a low ash melting point, the high amount of steam injected from below can cause the gasification layer to thin out. As a result, the temperature becomes concentrated in that area, leading to excessively high temperatures in the gasification layer (above the ash melting point), which can easily result in the formation of solid clumps! When the gasification layer is thin, the formation of solid clumps can more easily lead to the layer being torn apart or to unevenness in its surface. Therefore, when burning coal with a low ash melting point, upward blowing is essential; the people upstairs are truly experienced! Thank you! In this case, it is necessary to \"observe\" the slag and combine this with trial firings in the furnace, in order to determine the thickness of the slag layer and gasification layer as well as the position of the gasification layer, thereby judging whether the percentage of upward and downward blowing is appropriate. This is where the importance of the character “insert” becomes evident! This post was last edited by ddfmy on 2009-2-7 11:51]
Inserting it is for testing the fire – to check the length of the flame layer and ash layer, as well as the color of the flame. The yellower the color, the higher the temperature; dark red indicates a lower temperature. Test the fire for 2–3 minutes. The fire rod can be 12 mm in diameter, or 16 mm as well. In some cases, it is inserted while the furnace lid is open, while in other cases a nut is welded onto the furnace lid for insertion; after insertion, the screw is tightened, and there’s no need to open the furnace lid again
Although testing the furnace by firing it is a crude method, it is also the best way to understand its internal conditions. The key to operating the furnace lies in consistency.
Here we only observe, do not touch or insert anything, but there is an operation involving measuring the carbon layer thickness.
In my humble opinion, \"touching\" refers to the process of exploring various manufacturing techniques. I believe this exploration is necessary, especially when there are changes in the raw materials or other common parameters; it is particularly important to conduct a thorough analysis by combining observations and experiments in order to find ways to maintain process stability. There is no such thing as a truly \"simple furnace\"; stability and energy savings can only be achieved by developing stable manufacturing processes through continuous experimentation, and by finding ways to maintain furnace stability under changing raw material conditions and external factors. This post was last edited by ddfmy on 2009-2-7 11:48]
The varying downward insertion resistance felt during insertion also allows one to understand the load condition inside the furnace, enabling timely adjustments. This post was last edited by ddfmy on 2009-2-8 00:19]
If the carbon dioxide content in the gas is high, the furnace temperature drops. You can consider this as watching too: lol
The factors that affect the carbon dioxide content in gas include the composition of the coal, its chemical reactivity, and the gasification temperature. The conversion efficiency of CO2 is proportional to temperature; the higher the temperature, the higher the conversion rate of CO2. When the coal remains unchanged, analysis of the data shows that if the CO2 level is high, and the slag is uniform without any lumps while its volume increases slightly, with a slight increase in carbon content in the slag and no undecomposed carbon present, it can be concluded that the furnace temperature is low. This post was last edited by ddfmy on 2009-2-9 16:45]
Today’s analysis shows that the T2 temperature of the coal rods is only 1099 degrees. Everyone is discussing what to do with this kind of coal, as it’s not possible to obtain coal from outside! We have to find a solution from a technical standpoint!
The poster is right; as the saying goes, an expert can tell whether something is of good quality just by looking at it. When going out to learn about this field, it indeed depends on observing the quality of the slag – by checking its condition one can determine 1) the temperature level controlled in the furnace, 2) the overall condition of the furnace, and 3) the ratio between upper and lower airflow, that is, whether more air flows from above or below. Additionally, based on the condition of the slag, one should also consider factors such as the steam pressure supplied to the furnace, the volume of air flow [the opening degree of the air vents, the intensity of the airflow current, and the percentage of airflow], the opening degrees for upper and lower steam supply, as well as the model of the fan. As for testing the furnace, one can only wait for others to give it a try in order to further confirm one’s own judgment. In any case, it’s better to learn from others – at the very least to know what the furnace temperature is, whether the operation of the furnace is stable and how to adjust it, as well as some necessary process parameters.
Fixed-layer gas stoves are being phased out – is this ‘three-character formula’ still useful?