Method with stable heat energy recovery using low-concentration gas mixture of flammable gas and air and backflow device for carrying out said method

Abstract

The invention refers to the method for the utilization of low-concentration mixtures of a combustible gas and air with the stable recovery of heat and the flow-reversal device for the embodiment of the method. The method consists in the combustion, with heat recovery, of the mixtures in the flow-reversal device having at least a single pair of combustion sections, each of which has the structural packing of monolith blocks with small channels characterized by low pressure drop, provided with an internal heating device, temperature and composition sensors and the elements of the automatic control system, supplied with the low-concentration mixture with the combustible component and connected with the heat recovery apparatus through the pipeline, wherein the quantity of energy transferred in the heat recovery apparatus (22) is stabilized by supplying additional fuel to the flow-reversal device, selecting the flow reversal moment, and selecting the flow rate for hot gas supplied by the pipeline to the heat recovery apparatus (22). Additional fuel in the form of highly concentrated fuel mixture is introduced as an admixture to the stream of low concentrated mixture containing the combustible component, supplied to the flow-reversal device or to the internal heating device (7). The device according to the invention, in its combustion sections (I, II) is provided with symmetrical temperature sensors (TI, TII) and an additional supply of highly concentrated combustible mixture (17) connected to the supply system for low-concentration mixture (15) with the combustible component or to the internal heating device (7). The combustion sections (I, II) are packed with heat-accumulating material (1,2) of small porosity of the specific surface area below 30 m2 / g, and advantageously below 1 m2 / g.

Description

technical field [0001] The present invention relates to a method with stable thermal energy consumption using a low-concentration gas mixture of flammable gases and air and the backflow for embodiments of said method. The invention relates in particular to the combustion of methane-air mixtures in which CH can be found in the ventilation streams of hard coal mines (so-called ventilation stream methane) in thermal backflow devices with heat recovery 4 concentration. The method and the device according to the invention ensure utilization of the heat of combustion in the heat recovery plant under the operating conditions of the device which provide for a high combustion efficiency (conversion rate) and a sufficiently symmetrical temperature profile during the charging of the device , and the stability of energy consumption, where the energy flow delivered to the user is approximately constant during the operating cycle of the device. Background technique [0002] The use of b...

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Problems solved by technology

[0016] Another problem with reverse flow reactors is that after each reversal operation, there is a short-term ejection of unreacted flammable substrates, because some unburned mixture is directed over a short period immediately after the reversal To the packing, the mixture previously existed in the free cooled packing space and subsequently adsorbed on the surface of the packing and in the pores of the packing, especially if the packing is significantly porous

Local heat users will not accept this irregular supply of energy, and sending heat back to the system after processing will be vulnerable to opposition from electricity distributors

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