“Process for Nitrogen Separation from the Nitrogen Return Line in Closed-Circuit Pneumatic Conveying Systems of High-Density Polyethylene Powders”.

• IR Patent Application Serial No 140350140003004722,
• Filed on October 06, 2024,

ABSTRACT

A continuous process for separating nitrogen from a contaminated nitrogen mixture in a closed-loop pneumatic conveying system for transporting high-density polyethylene (HDPE) powder is developed. The process comprises introducing a contaminated nitrogen mixture into a filtration unit to remove at least 95% by weight of entrained particles, cooling the filtered gas stream in a first shell-and-tube heat exchanger using a flow control valve and a temperature sensor collectively configured to maintain an outlet temperature of 25°C to 35°C to condense at least 90% by weight of condensable components, producing a two-phase mixture, separating the nitrogen-rich gaseous phase from the liquid phase in an expansion-type separation drum, monitoring the oxygen concentration to maintain it below 5% by volume using an oxygen analyzer transmitter, pressurizing the separated gas stream using at least one blower to produce a reusable nitrogen stream, cooling the reusable nitrogen stream in a second shell-and-tube heat exchanger, and reintroducing the cooled reusable nitrogen stream into the conveying system via a rotary valve.

“Pilot-Scale Two-Phase Gas-Solid Conveying Test System with Pressure and Flow Control for Evaluating Various Materials Under Dense-Phase and Dilute-Phase Conditions”.

• IR Patent Application Serial No 140350140003008117,
• Filed on February 22, 2025,

ABSTRACT

A system configured to conduct a two-phase gas-solid conveying test under controlled pressure and flow conditions, the system comprising a gas pressure supply unit comprising at least one gas pressurizing device configured to receive and pressurize a gas stream and deliver the pressurized gas stream to a gas inlet line; a cooling unit disposed at a downstream of the gas pressure supply unit and connected in fluid communication therewith, the cooling unit configured to regulate a temperature of the pressurized gas stream; a gas flow control unit disposed at a downstream of the cooling unit and connected in fluid communication therewith, the gas flow control unit configured to regulate either a flow rate and a velocity of the pressurized gas stream through the gas inlet line, the gas flow control unit comprising at least one flow measuring device and at least one flow regulating valve; a two-phase transport unit disposed at a downstream of the gas flow control unit and connected in fluid communication therewith, the two-phase transport unit comprising a two-phase transport line configured to convey a two-phase gas-solid flow and at least one pressure monitoring device disposed along the two-phase transport line and configured to monitor pressure drop during the two-phase gas-solid conveying test; a solid-phase feeding unit mechanically coupled and fluidly connected to the two-phase transport line, the solid-phase feeding unit configured to deliver a plurality of solid particles into the two-phase transport line to form the two-phase gas-solid flow; and a product collection and separation disposed at a downstream of the two-phase transport unit and connected in fluid communication therewith, the PCS unit configured to receive the two-phase gas-solid flow, separate a solid phase from a gas phase, and discharge the gas phase to an atmospheric outlet.