SYNTHESIS GAS PRODUCTION PROCESS CONTROL METHOD FOR THE LOW-TONNAGE METHANOL PRODUCTION

摘要

FIELD: technological processes.;SUBSTANCE: invention relates to the synthesis gas production process control method for the low-tonnage methanol production. Method is implemented by the hydrocarbon gases partial oxidation at a pressure of 6.0–7.5 MPa in the gas generator, equipped with hydrocarbon gas and oxidizer input units, which include the hydrocarbon gas and oxidant mass flow flowmeters-regulators. Synthesis gas from the gas generator outlet is supplied to the waste heat boiler and cooled down with the chemically purified water stream, which mass flow is adjusted by the flowmeter regulator. At that, the waste heat boiler output is connected to the synthesis gas composition correction unit input, which includes: (1) hydrogen and carbon monoxide molar concentrations ratio in the synthesis gas correction unit, containing splitter, which input is connected to the waste heat boiler output, and the mixer, the splitter first branch pipe is connected directly to the mixer, the splitter second branch pipe is connected to the mixer via in-series connected controllable high-temperature choke and converter with the carbon monoxide vapor conversion catalyst; (2) carbon dioxide content correction unit, including connected to the mixer outlet heat exchanger-refrigerator, in which the synthesis gas is cooled down by the chemically purified water stream to 15–70 °C, which mass flow rate is adjusted by the flowmeter-regulator, and connected to the heat exchanger-refrigerator outlet separator, in which from the cooled vapor-gas mixture water vapor condensate and the partially dissolved therefrom liquefied carbon dioxide are separated, after which the synthesis gas is supplied to the methanol synthesis unit; (3) gas analyzer connected to the leaving the separator synthesis gas pipeline, wherein using the automated monitoring and control system performing the hydrogen and carbon monoxide molar concentrations ratio control in the range H₂/CO=2.2–2.6 and the stoichiometric ratio of its components in the range M=1.95–2.15, which, based on the results of coming from the gas analyzer discrete information on the hydrogen and carbon oxides current concentration in the leaving the separator synthesis gas, automatically calculates the adjusted control signals, which are supplied to the inputs of controlled high-temperature choke and the water supply mass flow rate flowmeter-regulator to the heat exchanger-refrigerator.;EFFECT: technical result consists in the possibility of automatic control over the synthesis gas production technological process parameters, and in the synthesis gas composition optimization for the subsequent methanol catalytic synthesis.;1 cl, 1 dwg, 6 tbl, 6 ex