Preheating method for fuel gas of reforming heating furnace and reforming device

Abstract

The embodiment of the invention provides a preheating method for fuel gas of a reforming heating furnace. The method comprises the steps that before the fuel gas enters the reforming heating furnace,primary preheating and secondary preheating are carried out; in the primary preheating process, the fuel gas and flue gas guided out are subjected to heat exchange in a first preheater; then the fuelgas is introduced into a secondary fuel gas preheating unit for secondary preheating; and the fuel gas subjected to secondary preheating is introduced into a fuel gas fine treatment unit for fine treatment and then is introduced into a combustor for combustion. The method has the advantages that the high-temperature flue gas entering the convection section is used for preheating the fuel gas, theamount of steam produced by the fuel gas can be decreased, and the energy utilization efficiency can be improved; and meanwhile, the fuel gas is preheated to the temperature meeting the finish treatment, and therefore the problem that sulfuric acid dew point corrosion occurs after the heat efficiency of the heating furnace is improved can be solved, the problem that the content of sulfur dioxide exceeds the standard when the fuel gas coarse desulfurization system fluctuates can be solved, and the emission concentration of nitric oxide can be further decreased. The embodiment of the invention further provides a reforming device based on the preheating method for the fuel gas of the reforming heating furnace.

Description

technical field [0001] The invention belongs to the technical field of petrochemical reforming, in particular to a fuel gas preheating method of a reforming heating furnace. The present invention also provides a reformer using the above fuel gas preheating method. Background technique [0002] The reformer is an important device in petrochemical plants, mainly producing high-quality gasoline and by-product hydrogen. The reforming reaction is a strong endothermic reaction, and it is necessary to use multiple heating furnaces to provide heat for the reforming reaction and product separation. Among them, the reforming reactor feed heating furnace is generally called a reforming furnace. The typical design of the reforming furnace is to combine four heating furnaces into a large portal heating furnace, with four radiation chambers separated by a fire wall or an air wall in the middle to avoid temperature interference. The furnace tubes of each radiation chamber are connected ...

AI Technical Summary

Problems solved by technology

Reducing the exhaust gas temperature of the heating furnace and recovering the waste heat of the flue gas are effective solutions to improve the thermal efficiency of the heating furnace, but the low-temperature flue gas dew point corrosion problem is the key problem restricting this solution

In addition, the fuel gas of the reformer comes from the fuel gas pipeline network of the refinery. Although the fuel gas in the pipeline network has been roughly treated, it is still difficult to meet the latest environmental protection standards under the condition of fluctuations in the performance of the fuel rough treatment system. Require

In the prior art, the fuel gas polishing treatment technology is an effective method to solve the problem of low-temperature flue gas dew point corrosion and excessive pollutant discharge, but the fuel gas polishing treatment technology requires a higher temperature, and only relies on the 150 The flue gas at ~190°C cannot preheat the fuel gas to the finishing temperature, and the finishing treatment of the fuel gas cannot be realized

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