CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)

The present disclosure provides a pure oxygen combustion three-fluid gas turbine for power generation, in which fuel gas, oxygen and steam in the combustion chamber are respectively controlled as required; there is no need for a complex airflow passage design and flow regulation and control; the pure oxygen combustion three-fluid gas turbine for power generation has a simple structure, a low cost, is easy to manufacture and assemble, and sets a basis for CO 2 recovery with low-energy consumption; for the first time, steam circulation is used to control the combustion temperature with low energy consumption, and steam cooling is also used to cool the moving blades and stationary vanes at low cost; besides, the initial combustion temperature can be improved by more than 100° C. with an equivalent high-temperature material, thereby the problem of steam cooling in existing gas turbines is solved.

A process for producing wax-based chemicals and α-olefins from waste plastics based on self-heating melt dechlorination, wherein the clean fragments of waste plastics are added into a water-cooling feed pipe, then fall into a hot melting dechlorination reactor; a part of molten plastic liquid extracted from the bottom of said hot melting dechlorination reactor is returned to the upper part of said hot melting dechlorination reactor, the other part of the molten plastic liquid is used as a raw material and fed to an upper middle part of a downer bed catalytic pyrolysis reactor; a gas-solid separation is performed at the bottom of said downer bed catalytic pyrolysis reactor; the separated pyrolysis oil gas is separated into α-olefin fraction, wax oil, high temperature oil slurry, and pyrolysis dry gas, the high temperature oil slurry is directly recycled to the upper part of said hot melting dechlorination reactor.

A process for preparing chemicals by graded gas-phase dehydrogenation and cracking of waste plastics and crude oil mixed feeding comprises: waste plastic self-heating melting dechlorination pretreatment, waste plastic molten liquid and crude oil selective vaporization dehydrogenation cracking, high-temperature cracked oil-gas gas-phase catalytic cracking, and cracked oil-gas fractionation and refining. Recycle oil and cracked dry gas from fractionation are recycled to pretreatment for melting and feedstock addition. Waste plastic molten liquid from pretreatment is mixed with crude oil as raw material for selective vaporization dehydrogenation cracking. Selective vaporization dehydrogenation cracking and gas-phase catalytic cracking are completed sequentially via atomizing nozzle feeding. The fractionation subsystem produces ethylene, propylene, butylene, benzene, toluene, xylenes, high-temperature recycle oil, and cracked dry gas.

The disclosure relates to a clean production method for epoxypropane using a chlorohydrination process with chlorine closed-loop circulation, comprising: (1) Chlorohydrination: dissolving chlorine in water, feeding into a reactor to generate chloropropanol solution, washing tail gas with NaOH electrolyte, and returning to propylene recovery; (2) Causticization: reacting chloropropanol solution with NaOH, feeding into a stripping tower to obtain crude epoxypropane and causticization wastewater; (3) Rectification: crude epoxypropane passes through a front distillation tower, epoxypropane extracted from the top, high-boiling components discharged from fractionating tower, both under normal pressure; (4) Wastewater treatment: supercritical gasification and separation of stripping tower wastewater, tail gas washing liquid, and fractionating tower wastewater, diluting NaCl slurry and returning to chlorine-alkali electrolytic bath; (5) NaCl electrolysis: electrolyzing brine, returning chlorine to chlorohydrination and NaOH to causticization. The method achieves clean epoxypropane production with low water and energy consumption.

The disclosure relates to a method for preparing potassium humate fertilizer through continuous high-pressure hydrothermal reaction of potassium feldspar. The method comprises: wet grinding slurrying, hydrothermal reaction, flash evaporation filter pressing, humic acid modified potassium fertilizer preparation, and causticization and humic acid modified silicon-calcium fertilizer preparation. High-pressure tubular hydrothermal and tower-type delayed reactions on potassium feldspar slurry produce potassium aluminosilicate and potassium silicate. Alkaline potassium aluminosilicate filter residues are mixed with humic acid, modified, granulated, and dried to obtain humic acid coated slow-release potassium fertilizer. The alkaline potassium silicate filtrate and lime undergo causticization to obtain KOH solution, which is recycled to the wet grinding process. Alkaline calcium silicate and humic acid are mixed, modified, granulated, and dried to produce humic acid coated slow-release silicon-calcium fertilizer.

A method for preparing artificial peat and fulvic acid from livestock and poultry manure in the breeding industry through a high-pressure hydrothermal method includes the following steps: regulating the concentration of the livestock and poultry manure to be 10-40%, pressurizing the livestock and poultry manure, and feeding into an electromagnetic heating tube reactor and a tower type delay reactor, then separating by using a depressurization flash tower, feeding a gas phase into a preheating heat exchanger, subsequently circulating a part of flash evaporation condensate back to a livestock and poultry manure concentration adjusting tank, separating a solid phase slurry through a pressure filter; using the filtered solid as an artificial peat; pumping a filtrate into a tubular heater, heating to 380° C. or above, then desalting in a desalting tower; mixing the desalted filtrate with the remaining flash condensate to obtain a fulvic acid product.

The present disclosure relates to a hot-melting dechlorination pretreatment device for waste plastics, wherein a waste plastic pulverizer is connected with a water-cooling feeding pipe through a controllable feeder. A pyrolysis dry gas injection inlet is provided at the top of the feeding pipe, and the bottom connects with a hot-melt dechlorination reactor equipped with a stirrer. A high-temperature hot-melt oil inlet is disposed at the upper part of the reactor, and a pyrolysis dry gas stripping distributor is arranged at the lower part. One path of the bottom connects to a high-speed circulating pipe with heating and returns to the upper part through a delivery pump, and the other path is used as raw material of the pyrolysis liquefaction device. A fuel gas extraction opening at the top connects with a desulfurization dechlorination reactor; one path recycles gas, the other discharges pyrolysis dry gas outward.

A system and method for studying and testing the boiling bubble behavior characteristics of mixed working fluids. The system includes a visualization chamber to contain mixed fluids, a heating device to heat the mixed fluids within the visualization chamber to generate boiling bubbles, a gas collection chamber, a constant temperature water bath to cool the boiling bubbles collected by the gas collection chamber to collect boiling bubbles generated in the mixed fluids within the visualization chamber, a third pressure sensor to obtain gas pressure inside the gas collection chamber, a third temperature sensor to obtain temperature of the constant temperature water bath, and a data processing module to determine component concentrations of the boiling bubbles in the mixed fluids based on the gas pressure inside the gas collection chamber and the temperature of the constant temperature water bath.

This invention provides a porous material for wellbore thermal insulation in drilling, its preparation method, and application, belong to the field of oilfield chemical technology. The preparation method of the porous material comprises the steps of: thoroughly mixing ceramic powder and a pore-forming agent; prilling using a colloidal solution as a binder; then subjecting to heat treatment to obtain porous ceramsite; dispersing porous ceramsite, an anionic monomer, and a cationic monomer in deionized water; adding an initiator for reaction; then washing and drying to obtain the final product. The porous material utilizes natural minerals and industrial waste as raw materials, which are low-cost, readily available, and environmentally friendly. When applied for wellbore thermal insulation, the porous material prevents screening removal by solid-liquid separation equipment, enabling multiple reuse cycles. The porous material exhibits abundant micron/nano-scale pores internally, delivering low thermal conductivity and superior insulation performance.

A method and system for determining a critical inelastic strain rate during a creep-fatigue damage process are provided. The method includes: obtaining a plurality of high-temperature equipment materials; under a same temperature condition, conducting a creep test, a fatigue test, and a creep-fatigue interaction test on the high-temperature equipment materials, respectively; establishing a stress relaxation formula based on the creep test result; establishing a fitting equation for an inelastic strain energy density at a failure based on the fatigue test result; establishing a net tensile hysteresis energy-induced fatigue damage equation based on the creep-fatigue interaction test result; and according to a linear cumulative damage rule, determining a creep-fatigue life of the high-temperature equipment materials based on the stress relaxation formula, the fitting equation for an inelastic strain energy density at a failure, and the net tensile hysteresis energy-induced fatigue damage equation.