INFLUENCE OF HYDROGEN-CONTAINING GAS COMPOSITION ON METHANOL YIELD
| Autor: | Yuriy V. Zagashvili, Aleksey M. Kuzmin |
|---|---|
| Jazyk: | ruština |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 331, Iss 10, Pp 187-195 (2020) |
| Druh dokumentu: | article |
| ISSN: | 24131830 2500-1019 2413-1830 |
| DOI: | 10.18799/24131830/2020/10/2871 |
| Popis: | The research relevance is caused by the lack of scientific evidence about methanol yield from natural gas depending on the type of oxidant (oxygen, enriched air or air) and optimization of structure and parameters of hydrogen-containing gas according to the criteria of the ratio of the components of the synthesis gas H2/CO and module (factorial) hydrogen-containing gas M for optimal methanol synthesis. The problem is particularly important for low-tonnage plants producing methanol in field conditions operating on nitrogen-ballasted hydrogen-containing gas. The aim of the research is to evaluate the effect of optimizing the composition of hydrogen-containing gas on the yield of methanol. Objects: low-tonnage plants for production of methanol from hydrogen-containing gas, consisting of a complex for generating hydrogen-containing gas and a complex for the catalytic synthesis of methanol. The complex for generating hydrogen-containing gas includes a three-component synthesis gas generator (natural gas – oxidizer –chemical-treated water), in which the partial oxidation of raw material is carried out, a block of heat exchangers and a block for correcting the composition and parameters of hydrogen-containing gas to ensure the ratio of components H2/CO=2,2÷2,8 and the module M=2,0÷2,3. The complex of catalytic synthesis of methanol includes a flow cascade consisting of three sequentially connected isothermal reactors with the output of raw methanol after each reactor without recirculating the waste and tail gases. Methods: the thermodynamic calculations. Results. The paper confirms the known fact of increasing the specific yield of methanol depending on the concentration of O2 in the oxidizing agent under partial oxidation of natural gas. It is shown that optimization of the hydrogen-containing gas which goes through the catalytic methanol synthesis provides an increase in specific yield of methanol. Average specific growth yield of methanol during the synthesis in an optimized composition at M=2,05 compared to non-optimized synthesis gas composition is 8–12 %. The increase in specific yield of methanol is maintained regardless of the adopted in the calculation of gas conversion degree of in the reactors of the cascade complex for the synthesis of methanol for all types of oxidizing agents. The authors have identified the nonlinear dependence of methanol yield on the concentration of O2 in the oxidant. It consists of reducing the increase in specific yield of methanol, when the concentration of O2 in the oxidizer is over 70 %. The revealed dependence requires additional study and experimental confirmation. It allows optimizing the operating costs of the oxidizer by reducing the specific cost of O2 on methanol yield from the raw material. |
| Databáze: | Directory of Open Access Journals |
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