A method for adjusting jet velocity of multi-nozzle gas nozzle
An adjustment method, multi-nozzle technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve problems such as difficulty in practice, affecting the reaction, and the nozzle grid cannot guide and solve the adjustment problems of nozzle flow rate differences. , to achieve the effect of flow rate optimization
Active Publication Date: 2020-08-04
武汉新能源研究院有限公司 +1
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Problems solved by technology
For most gas reactors, this degree of difference is enough to affect the mixing degree of the reactant gas in the flow field, thereby affecting the progress of the reaction.
[0004] The design method of the nozzle grid disclosed at present is basically unable to guide and solve the problem of adjusting the flow velocity difference between different nozzles, and very few existing schemes have carried out a complicated design on the structure of the nozzle grid, which is difficult to apply in practice
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[0054] The initial nozzle data before adjustment is: the diameter of the branch pipe is 50mm, and the diameter of the nozzle is 34mm. The flow rate of the nozzle is 30m / s, and the nozzle height is 80mm.
[0055] D is calculated from existing data z / D p is 0.68, calculated from the table as follows: the two closest points to this ratio are D z / D p 0.7 and 0.64 correspond to the proportions of 0.869 and 0.875 respectively, according to linear calculation, The calculation can obtain the optimal lower diameter ratio n=0.871, the optimal lower diameter can be obtained as 29.6mm, and the correction coefficient α=2>0, directly adjust the lower diameter of the nozzle to 29mm.
[0056] Effect verification: under the premise that the type and pressure of the intake air remain unchanged, the velocity of the inner and outer nozzles of the multi-nozzle gas nozzle grille before optimization and after optimization are respectively measured, and the change of the gas ejection velocity ...
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The invention discloses a multi-nozzle gas nozzle spray speed adjustment method, and relates to the field of gas phase reactors. The method comprises the following steps: S1, sequentially adopting multi-nozzle gas nozzles with different ratios of nozzle diameter to branch pipe diameter, and adjusting a lower diameter of an outer nozzle to reach uniform airflow of each nozzle, and establishing a standard optimization table including the ratio of the nozzle diameter to the branch pipe diameter and the optimal outer nozzle diameter; S2, acquiring the nozzle diameter, the branch diameter, an inletflow rate and a nozzle height of the multi-nozzle gas nozzle to be adjusted; and S3. calculating the ratio of the nozzle diameter to the branch pipe diameter of the multi-nozzle gas nozzle to be adjusted, comparing the calculated the ratio with the standard optimization table, conducting correction to obtain an optimal lower diameter of the outer nozzle value, and adjusting the lower diameter. The multi-nozzle gas nozzle spray speed adjustment method of the invention can uniformly adjust the spray speed of each nozzle of a nozzle grille without complicating the basic structure of the nozzle grille, so that the reaction gas mixing is more uniform, and the reaction efficiency is improved.
Description
technical field [0001] The invention relates to the field of gas phase reactor design, in particular to a method for adjusting the spraying speed of a multi-nozzle gas nozzle. Background technique [0002] In the existing experimental equipment and many engineering equipment, it is necessary to use multi-nozzle nozzles to add reaction gas or catalytic gas to the reactor to ensure that the various reaction gases in the reactor are mixed evenly to improve the reaction efficiency. Typical examples are fire Ammonia injection grids in SCR denitrification devices used in power plants. [0003] Most of the existing multi-nozzle nozzle grids have a single branch pipe with multi-nozzle structure, which can effectively save device costs and will not have a great impact on the internal flow field of the reactor. However, in this multi-nozzle nozzle grid, the average air velocity of each nozzle has a certain gap. The numerical simulation results show that the average velocity differenc...
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IPC IPC(8): B01J4/00B01D53/76B01D53/56B01D53/86
CPCB01D53/56B01D53/76B01D53/8625B01J4/002B01J4/008
Inventor 孙路石王贲于洁周铭王洪升黄晓宏
Owner 武汉新能源研究院有限公司