Limit type recycling method for waste heat of industrial flue gas

Abstract

The invention particularly relates to a limit type recycling method for waste heat of industrial flue gas, and belongs to the technical field of industrial energy conservation. A shell arranged obliquely is required to implement the limit type recycling method, a flue gas inlet is arranged at the upper end of the shell, a flue gas outlet is arranged on one side of the lower portion of the shell, three heat collectors which are obliquely arranged in an overlaid manner are arranged in the shell, a heat storage device is arranged in each heat collector, the flue gas inlet, the flue gas outlet and the heat collectors form a flue gas channel, an air inlet tube and an air outlet tube are further disposed in the shell, and heat exchange between flue gas and the heat storage devices of the heat collectors is carried out by circulation of the flue gas and air in the three heat collectors. The limit type recycling method has the advantages that the three oblique heat collectors can be compactly overlaid together, so that the shell is small in occupied area, a huge gas and liquid separator structure disclosed in the invention with the number of ZL200810195931.6 is omitted, a group of devices used in a heat exchange method disclosed in the invention with the number of ZL200810195931.6 is actually omitted, particularly, the structure is simple after a group of valve plates is omitted, and the limit type recycling method is easy to implement in terms of engineering.

Description

technical field [0001] The invention belongs to the technical field of industrial energy saving, and in particular relates to a limit-type recovery and utilization method of industrial flue gas waste heat. Background technique [0002] The foundry industry is undergoing a low-carbon revolution, and energy-saving and emission-reduction technologies have attracted much attention because of their huge role in this revolution. The emission reduction technology and equipment for industrial greenhouse gas emissions, carbon emission reduction and carbon conversion and utilization technology have become one of the key contents of technology. Most of the equipment in the petrochemical industry uses fuel oil and fuel gas as the main fuel. The main components of the flue gas are CO2, SOx, NOx and other acid gases. If the temperature of these gases drops below the dew point, it will cause serious corrosion to the equipment, and These gases are released into the atmosphere and will diss...

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Problems solved by technology

[0004] At present, the utilization of industrial flue gas waste heat is still in full swing in the research of plate heat exchangers, phase change boilers, enamel tube heat exchangers, cast iron plate heat exchangers, etc., in order to reduce the waste heat of flue gas below 200 ℃ to all None of the heat exchangers (air preheaters) can reach below the dew point of the flue gas, otherwise it will cause serious electrochemical corrosion, that is, dew point corrosion, which will cause a safety hazard for the device to run stably, at full capacity and at full capacity. The method of utilizing low-temperature heat from industrial furnace flue gas (patent No.: 200810195931.6), solved the problem of dew point corrosion, but ZL200810195931.6 in actual engineering is too large to meet the problem of safety distance on site. It must be large, and it is difficult to form industrial applications under the condition that our country's current land is not an incoming resource.

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