Adiabatic technology of syn-gas production from hydrocarbon gases

Adiabatic technology of syn-gas  production from hydrocarbon gases Abstract

Key words: syn-gas generation, hydrocarbon conversion, energy conversion, nuclear reactor, high temperature reforming, multistage process, helium heating, adiabatic catalytic reactor, oxygenless technology

Different conversion technologies (shaft tube reforming, heat radiation rings, multistage process, solid carrier circulation etc versions) have been developed for gas processing chemical complexes produced hydrogen, ammonia, methanol and for energy accumulation till the date.

During last years, a lot of efforts have been devoted to development of the  technologies for hydrogen production (syngas generation, hydrocarbon conversion) based on convective heating. Key research target was to find the cost-effective processes with maximal specific (per reactor volume) productivity, to create compact heat exchangers, to simplify the technology and to enhance the safety and environment protection. Hydrogen production technology as the element of process GTL (“gas-to-liquid”)  , which provides the total energy supply for the chemical plant produced the hydrogen and/or DME - was studied and successfully applied for design of the effective high-temperature reactor systems. Multistage adiabatic catalytic reforming with multiple heating of the methane-steam mix in the first helium reactor circuit  were used for hydrocarbon conversion under moderate temperatures with minimal energy and capital cost (per hydrogen molecule obtained) and with low (40-45% reduced) natural gas consumption (details: in Russian).

An objective of the innovation is to solve the above-described problems of the related prior art and to provide the following specific advantages:

1) to increase the specific (per reactor volume unit) productivity  of  process gas treatment and syn-gas making via increasing of conversion rate and providing forced (instead of passive, self-driving in prior art) mode of the heat and mass transfer processes within the process heat exchanger;

2) to improve chemical quality of the syn-gas (for example, to enrich syn-gas with hydrogen) via increasing a steam-methane ratio and to prevent any hazardous risks associated with the explosiveness of process gas and  the kinetic difficulties during the reaction (soot generation, overheating of catalyst);

3) to allow tunable (for different chemical final products), scalable (for different total power of unit) and economical operation in a wide range of the operational and performance conditions, including at relatively low total power and compact unit scales;

4) to exclude influence of the refractory cast alloy tubes on the operational characteristics to enhance the reliability and dynamic behavior  of the integrated system;

5) to enhance the safety and to increase the coefficient  of operation performance;

6) to increase repairability and life-time of internal process heat exchangers of  the integrated unit, subjected to stress  attack. The technology might be applied  for production of a wide range of commercial valuables such as hydrogen or Fischer-Tropsch synthetic products, methanol, ethylene, DME for subsequent usage in petrochemical plants, refineries, fertilizer industry, transportation or metallurgy; synthesis gas for use as reagent in the chemical industries or as a fuel in the fuel cells, gas turbines or internal combustion engines.

10.11.2006, 3937  просмотров.