Dual-layer hot air distribution pipe

Abstract

The invention discloses a dual-layer hot air distribution pipe, and belongs to the technical field of ultra-low concentration methane heat counter-current oxidation and low-density energy recycling. The pipe is characterized by comprising main pipes (1) and multiple branches (3) arranged on the two sides of the main pipes (1); and the air outlet end of each main pipe (1) is provided with a main pipe end pipe (2), each main pipe (1) comprises a conveying main pipe (6) and a distribution main pipe (5) which are sequentially arranged from inside to outside, the air outlet end of each conveying main pipe (6) communicates with the conveying main pipe (6) and a main pipe distribution cavity (8) of the next segment of the main pipe (1) at the same time, each branch pipe (3) comprises a conveyingbranch pipe (10) and a distribution branch pipe (9) which are sequentially arranged from inside to outside, and the air outlet end of each conveying branch pipe (10) communicates with the conveying branch pipe (10) and the distribution branch pipe (9) of the next segment of branch pipe (3) at the same time. The dual-layer hot air distribution pie solves the problem that temperature distribution isnot uniform thoroughly, and temperature distribution of an oxide bed on the same cross section is more uniform.

Description

technical field [0001] A double-layer hot air distribution pipe belongs to the technical field of ultra-low concentration methane thermal countercurrent oxidation and low-density energy recovery. Background technique [0002] The main component of coal mine gas is methane, which is both a gas energy source and a greenhouse gas. In addition to partial extraction, most of the gas is directly discharged into the atmosphere through the coal mine ventilation system, causing energy waste and air pollution. Thermal flow-reversal reactor (TFRR for short) in coal mine exhaust air can oxidize methane in exhaust air into carbon dioxide and water, realizing the utilization of low-quality energy and reducing greenhouse gas emissions. [0003] Before the coal mine exhaust air gas oxidation device is in normal operation, it needs to use a certain amount of energy to heat the central part of the oxidation bed to about 900~1000°C, and form a certain temperature distribution, which will dire...

AI Technical Summary

Problems solved by technology

This heating start technology has the advantages of simple structure, easy control, etc., but there are also many disadvantages: for example, after the electric heater stops heating, it is easy to oxidize and become brittle in the high temperature zone of the oxidizing atmosphere for a long time, or even break, and lose the function of restarting.

But there are problems: (1) The temperature distribution on the same cross-section of the oxidation bed is not uniform, the central temperature is high, the temperature on both sides is low, the front side temperature is high, and the rear side temperature is low, which affects the establishment of the entire temperature field of the oxidation bed and the maintenance of the device. The oxidation rate will have a great impact; for the drying space of the drying device, there is also the problem of uneven temperature distribution. The bigger the space, the worse the drying effect

(2) For a larger heating space, due to the longer heat distribution pipeline, the overall thermal deformation is more obvious

[0007] The reason is that in the process of hot air distribution, along with the outward heat dissipation of the pipe wall, whether along the main pipe or along the branch pipes, the temperature of the hot air gradually decreases from front to back. The key factor of temperature unevenness, and the effect of simple structural adjustment is not obvious, and the essential problem cannot be solved

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