What kind of furnace is used for gas production?
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I wonder what kind of furnaces are used in the gas generation stage for ammonia synthesis these days, and what their performance is like ?
The original poster posted in the wrong forum~ The type of furnace used for gas production depends on the following factors: 1) the capacity for ammonia synthesis, and 2) the quality of the raw coal. In China, small-scale ammonia synthesis plants generally use fixed-bed gasification furnaces, which account for half of all gas production facilities in the country. For large-scale use, fluidized bed gasifiers and fluidized gasifiers are employed
We are using a Texaco water-coal slurry gasifier, and it is working very well currently
Using a fixed-bed gas furnace yields average results; it’s a small nitrogen process
Coal is currently in short supply; the development of water-coal slurry gasification (multi-nozzle, GE Texaco gasifiers) and dry powder coal gasification (Shell, GSP) represents the future direction for progress. At present, we use fixed-bed reactors, and Sicheng is working on the design for water-coal slurry gasification.
How to select a fixed-bed gas generator? ? 、
We use fixed-layer gas furnaces with a low-nitrogen process, and the results are fairly satisfactory. The fuel used is briquetted coal. At present, the best furnace models for small nitrogen plants are those with a height of less than 3 meters. From what I understand, it is generally believed that furnace models with a height of 2.6 or 2.8 meters work best; furnace models with a height of less than 2.4 meters are not worth considering
Currently, the diameter of gas generation furnaces for small-scale nitrogen fertilizer production is moving towards 2.8 or even 3 meters. Due to differences in the raw coal used and operating practices among various factories, it was previously believed that gas generation furnaces with larger diameters were difficult to operate; as a result, many newly built ammonia synthesis plants still use furnaces with a diameter of 2.4 meters. This means that plants of relatively small scale need to have twenty or even thirty such furnaces, which makes management difficult and increases operational costs. With improved understanding of the structure of these furnaces, 2.8-meter diameter furnaces are now functioning well, and 3.0-meter diameter furnaces are also being adopted. In the future, even larger furnaces will be the trend in this field.
Our factory uses furnaces with a capacity of 2.61. A total of 12 units
Fixed-bed batch gasifier – this type of furnace is commonly used in small nitrogen fertilizer plants to produce gas.
This post was last edited by ZQLIUGE on 2009-5-16 20:08. When selecting a furnace type, factors such as the type of material to be processed, the height-to-diameter ratio, production capacity, and accompanying facilities are taken into consideration
As you mentioned, the gas generation method referred to is probably the early form of ‘UGR’. Nowadays, we no longer encourage the use of such projects, mainly due to concerns regarding pollution and energy consumption. As for the choice of method, it depends primarily on the scale of the project and the properties of the coal used
Our factory uses 11 sets of 2.6M fixed-bed reactors, with 9 in operation and 2 as backups. We modified the reactor tanks to make them taller; the raw material used is type 3-8 from Ningxia, and the performance is quite good
At present, most enterprises in the country use fixed-bed gasifiers; these types of furnaces have high energy consumption and do not comply with relevant policies. In the future, more fluidized-bed and gas-flow bed gasifiers, which have lower energy consumption, should be adopted.
Choosing the right gasification furnace is not a simple task; it depends on factors such as scale, properties of the raw materials, and many others. Currently, domestic enterprises use fixed-bed gasifiers, fluidized-bed gasifiers, and fluidized-gas bed gasifiers.
Fixed-bed furnaces are generally used for medium and small capacity systems, while fluidized bed or gas-flow bed furnaces are used for large-scale systems. At present, this kind of development brings efficiency benefits, but it faces the problem of low effectiveness. Designing coal gasification at the molecular level can fundamentally solve this problem, enabling the efficient and high-yield gasification of various types of coal. The number of units on floors 10 and 14 can be reduced by 2/3 through technical upgrades. The molecular vaporization process uses superheated steam and hot air for continuous gas generation, which can improve the efficiency of existing water gas generators by about 30%. We can develop technical improvement plans for this area.
A gas generator will do; there are many manufacturers in the Yixing area of Jiangsu.
When choosing a furnace for gas production, it should strictly be determined based on local resources or stable raw materials available for the project. Generally, a fixed-bed gasification furnace using anthracite is used; its advantages include low investment costs, low consumption, and minimal pollution once air for combustion is recycled. If bituminous coal is used, a furnace should be selected that is suitable for that type of coal; otherwise, the coal will not be suitable for use, and it will be useless once it’s in the furnace. Information regarding furnaces can be found in relevant discussions.
It mainly depends on the output of synthetic ammonia and the quality of the raw coal. At present, most small nitrogen fertilizer plants in China use fixed-bed gasification, but in the long term this approach is not very favorable; it is recommended to use fluidized-bed or gas-flow bed gasifiers. These processes are now quite mature, and generally no problems arise.
I agree with you that gas generators with larger diameters are more economical, but it’s not the case that the larger they are, the better – there should be a certain limit in this regard, depending on the cost-performance ratio”