Process for producing synthesis gas with preservation of the energy transfer by means of the fumes

摘要

The present invention concerns a process for producing synthesis gas by steam reforming a hydrocarbon load in a reforming furnace provided with a combustion chamber and a convection chamber; the combustion chamber includes vertical tubes filled with catalyst wherein a mixture of hydrocarbons and steam circulates from top to bottom recovering raw synthesis gas at the bottom of the tubes, and burners disposed in rows heat the tubes; the convection chamber discharges fumes containing the gases produced by the combustion. The process also comprises steps of using the heat contained in the fumes for preheating and/or heating various fluids related or unrelated to the process. In the event of the reduction of the mass flow of fumes, the quantity of energy to be transferred into the convection area is maintained by supplying a supplementary gaseous flow to the combustion area.

主权项

1. A process for producing synthesis gas from a hydrocarbon load, the process comprising the steps of:
generating a raw synthesis gas by steam reforming of said hydrocarbon load with production of the heat necessary for the reforming by means of a combustion, said step of generating the synthesis gas being performed in a reforming furnace comprising at least:
a combustion chamber containing one or more rows of vertical tubes filled with catalyst, the combustion chamber configured to circulate a mixture containing the hydrocarbon load and steam from top to bottom, so as to recover the raw synthesis gas at the bottom of the tubes, and burners disposed in rows, said burners being supplied with fuel and combustion air and producing, by combustion, flames operable to heat the tubes and gases;at least one convection chamber configured to discharge fumes containing the gases produced by the combustion;
using heat contained in the fumes for the preheating and/or the heating of various fluids related or not to the process,wherein the fuel comprises at least one primary fuel and a secondary fuel, wherein the secondary fuel comprises at least one residual gas in relation to the synthesis gas production process;measuring a mass flow of the fumes;supplying a supplementary gas flow to the combustion area if there is a reduction in the measured mass flow of the fumes, such that the quantity of energy to be transferred into the convection area is maintained, wherein the supplementary gas flow supplied to the combustion area is a flow of gas inert towards the combustion reaction.