Double-layer hot air distribution pipe

Abstract

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. It is characterized in that it includes a main pipe (1) and a plurality of branch pipes (3) arranged on both sides of the main pipe (1), and the outlet end of the main pipe (1) is provided with a main pipe end pipe (2); each section of the main pipe (1) includes The conveying main pipe (6) and the distributing main pipe (5) are arranged sequentially from the inside to the outside, and the gas outlet end of the conveying main pipe (6) is simultaneously connected with the main pipe distributing cavity (8) and the conveying main pipe (6) of the next main pipe (1); Each branch pipe (3) includes a delivery branch pipe (10) and a distribution branch pipe (9) arranged sequentially from the inside to the outside, and the gas outlet end of the delivery branch pipe (10) is connected with the delivery branch pipe (10) and The distribution branch pipe (9) is connected. The double-layer hot air distribution pipe fundamentally solves the problem of uneven temperature distribution, making the temperature distribution of the oxidation bed more uniform on the same cross section.

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

Images