Deoxidizing reaction device for oxygen-containing coalbed methane

Abstract

The invention discloses a deoxidizing reaction device for oxygen-containing coalbed methane. The deoxidizing reaction device for the oxygen-containing coalbed methane mainly comprises a vertical heat transfer sleeve pipe deoxidizing reactor, a heat transfer temperature control system, a heat transfer medium circulating and control assembly and a heat exchange device, wherein a heat transfer medium distribution chamber and a reflux chamber are arranged at a deoxidizing top; a vertical sleeve pipe is formed by nesting an inner pipe and an outer pipe, and extends downwards into a catalyst bed layer until the vertical sleeve pipe reaches the bottom part of the bed layer, and a heat transfer medium in the distribution chamber can flow downwards into the inner pipe, and then flow upwards into the reflux chamber via the outer pipe; the heat transfer medium circulating and control assembly and the heat exchange device are arranged in the reflux chamber and / or at the exterior of the reactor. The deoxidizing reaction device has the advantages that the circulating heat transfer temperature control is performed by the vertical heat transfer sleeve pipe deoxidizing reactor and normal-pressure or a low-temperature heat conduction oil, molten salt, nitrogen, carbon dioxide or overheated water steam heat exchange medium with temperature approximate to the temperature of the catalyst bed layer, a reaction heat point is eliminated, the reaction is stable and controllable, the running is safe, and the reaction effect is good; the service life of the catalyst is long, and the catalyst can be easily discharged out of the bottom part of the reactor in a replacing process; when the sleeve pipe with a small number of leakage is blocked off, the influence to the bed layer temperature and the reaction effect is small.

Description

technical field [0001] The invention belongs to the field of chemical reactors, in particular to a deoxidation reaction device for oxygen-containing coal bed gas. Background technique [0002] Coal bed methane, also known as gas, is the methane-containing gas extracted from coal mines before and during the mining process. The coal bed methane pumped out during the coal mining process contains more air, and is generally called oxygen-containing coal bed methane. At present, the oxygen-containing coalbed methane pumped out during the coal mining process in my country is limited by specific conditions, and only a few mining areas have utilized it, such as on-site power generation, deoxygenation and dehydration, and then entering the pipeline network to supply nearby markets or further processing to produce liquefied natural gas. Part of it is directly discharged into the atmosphere, which not only wastes energy, but also pollutes the atmosphere, because methane is a greenhouse g...

AI Technical Summary

Problems solved by technology

[0006] 1. When high-pressure water is used as the heat exchange medium, it is limited by the steam pressure. When the reaction water temperature is above 250°C, the steam pressure of the water-cooling system is too high, which leads to the high pressure level and manufacturing cost of the reactor. It is used for coalbed methane deoxidation There are also great safety risks in the process; at the same time, the reaction temperature of coalbed methane deoxidation is high or the reaction and heat release are concentrated. When the noble metal combustion deoxidation catalyst with palladium and / or platinum as the main active component Concentrated reaction and exothermic heat, the bed temperature of the combustion deoxidation catalyst with one or more of copper, nickel, cobalt, manganese, molybdenum, and iron as the main active component is about 450-500°C, and rare earths such as cerium, lanthanum, etc. The bed temperature of the combustion deoxygenation catalyst as the main active component is about 550-650°C, so high-pressure water is not suitable for temperature control in the coalbed methane deoxygenation process, which will cause temperature rise of the catalyst bed, large temperature difference, and local hot spots This leads to the problems of poor catalytic reaction effect and short service life of the catalyst; the saturated vapor pressure of water is 3.97 MPa at 250°C, 8.59 MPa at 300°C, and 12.8 MPa at 330°C;

[0007] 2. When the catalyst needs to be replaced or repaired after long-term operation, it is difficult to unload due to the restriction or obstruction of the shape and position of the heat exchange and temperature control components; 3. When individual heat exchange coils and tubes leak, the tubes are usually difficult to remove. Leakage plugging, the coil can plug one or a few, but it has a greater impact due to its long length

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