Gas starting device for low-concentration methanol counter-flow thermal oxidation device
A start-up device and low-concentration technology, applied in the burner, combustion method, combustion type, etc., can solve the problems of high start-up cost, unstable gas flow rate and flow, large gas volume, etc., to shorten the start-up time and save the start-up cost. Effect
Active Publication Date: 2010-06-09
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
Mine exhaust air has low methane concentration (3 / s) and the gas flow rate and flow rate are unstable, so the conventional combustion treatment method does not work at all
[0003] At present, there have been experiments at home and abroad for the low-concentration methane oxidation treatment device for mine exhaust air, and there are still many problems to be solved. Among them, electric heating is basically selected as the starting method of the device, and the start-up time of electric heating is long, and the start-up cost high
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[0019] The theoretical basis of the present invention is that the diffusion flame has a wider stable range than the premixed flame, so the present invention adopts a swirl diffusion combustion system, which is suitable for various gas fuels such as natural gas and syngas.
[0020] see figure 1 with figure 2 , the gas starting device 100 of the present invention includes an air swirler 10 and a fuel swirler 11 . The present invention integrates two kinds of swirlers. The middle part is a fuel swirler with tangential fuel holes 12, and the swirler is surrounded by tangential air grooves 13.
[0021] The tangential direction of the fuel hole 12 is opposite to the tangential direction of the air groove 13 (see figure 1 As shown in a, b, and c), a larger recirculation zone can be generated than that of the co-rotating flow. The main reason is that the strong shear on the boundary of the inner and outer swirls leads to the diffusion and dissipation of the inner swirl, resulting i...
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The invention discloses a gas starting device, which comprises a combustion chamber and a cyclone. One end of the combustion chamber is a mixing section, and the other end of the combustion chamber is connected to a low-concentration methanol counter-flow thermal oxidation device; the edge of the cyclone is provided with a tangential air notch to form an air cyclone; the middle part of the air cyclone is provided with a tangential fuel port to form a fuel cyclone; the tangential direction of the air notch of the air cyclone is opposite to that of the fuel port of the fuel cyclone; one surface of the cyclone which is provided with a nozzle is connected with the mixing section, and an expanding extension section is arranged between the cyclone and the mixing section to increase the radial separation distance between an axial velocity peak value and a tangential velocity peak value and reverse mass flow; one surface of the air cyclone which is provided with an air inlet is connected with an air passage, and a fuel flow passage is sleeved in the air passage; and one side of the mixing section is provided with a mixed air inlet used for cooling high-temperature gas by mixing, and the fuel amount and the air amount of the cyclone and the air amount of the mixed air inlet are adjusted so as to adjust the outlet velocity of the fuel and the temperature.
Description
technical field [0001] The invention belongs to the fields of coal bed gas treatment and greenhouse gas emission reduction, and in particular relates to a gas starting device of a low-concentration methane countercurrent thermal oxidation device. Background technique [0002] my country emits 19 billion m of methane gas into the atmosphere every year due to coal mining. 3 , ranking first in the world, accounting for about one-third of China's methane emissions from industrial production. Mine exhaust air has low methane concentration (<0.75%), difficult to collect, and large gas volume (40-500m 3 / s) and the gas flow rate and flow rate are unstable, so the conventional combustion treatment method does not work at all. [0003] At present, there have been experiments at home and abroad on the low-concentration methane oxidation treatment device for mine exhaust air, and there are still many problems to be solved. Among them, electric heating is basically selected as the ...
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Login to View More IPC IPC(8): F23D14/02F23D14/62
Inventor 肖云汉姜凡穆克进吕元周娴王波
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI