Mitsubishi Gas Chemical Company, Inc.

Hiromi Nakamura

Norio Sayama

Takehiko Takahashi

Kazuo Yamamoto

Norio Narazaki

The present invention relates to a method for efficiently recovering energy from off-gas with high temperatures and high pressures released from the oxidation reactor of aromatic compounds such as xylene, pseudocumene, durene and the like. More particularly, the present invention relates to a method for energy recovery from oxidation reactor off-gas, which comprises subjecting off-gas with high temperature and high pressure from an oxidation reactor to heat exchange with cooling water to cool the off-gas, subjecting the cooled off-gas to direct counter-flow contact with the water heated by said heat exchange to obtain a mixture of off-gas and steam, and cooled water, circulating the cooled water for reuse as said cooling water for said high temperature and high pressure off-gas, and sending the mixture of off-gas and steam to an expander to recover energy therefrom. According to the present invention, the energy recovered from off-gas increases by an amount equivalent to the amount of steam saturating in and accompanying the off-gas.

Method for energy recovery from oxidation reactor off-gas

In a regenerative gas turbine cycle in which heat recovery is carried out by multi-phase and multi-component mixture of compressed air/liquid phase water/steam (hereinafter referred to as MPC mixture), said mixture being obtained by injection of liquid phase water (hereinafter referred to simply as water) into a part of or the whole of compressed gas using air or air based gas (hereinafter referred to as air) as a combustion supporting/working medium gas; the improvement comprising

Regenerative gas turbine cycle

A regenerative gas turbine cycle wherein heat recovery is carried out by a mixture of air/steam which is obtained by contact between water and compressed air, the compressed air being compressed by a compressor for compressing gas using air or air based gas as a combustion supporting/working medium gas. The cycle includes the improvement whereby mixture of air/steam and liquid phase cooled water is obtained through contact between the compressed air and heated water which is used as heat recovering medium; the cooled water being used as heat recovering medium not only for heat recovery of turbine exhaust gas but also, for

In a regenerative gas turbine cycle in which heat recovery is carried out by a mixture of air/steam which is obtained by contact between water and a part of or the whole of compressed air, said compressed air being compressed by a compressor for compressing gas using air or air based gas as a combustion supporting/working medium gas; the improvement comprising: the mixture of air/steam and liquid phase cooled water being obtained through the contact between the compressed air and heated water which is used as heat recovering medium; said cooled water being used as heat recovering medium not only for heat recovery of turbine exhaust gas but also, for

A heat exchanging system for a heat engine wherein compressed air alone or gas including air as the main part thereof is used as a gaseous combustion supporting medium, working mixture or the like, said system is characterized in that heat recovery is accomplished by a utilization of a gaseous or mistlike mixture which is obtained by adding liquid phase water to a part of or the whole of said compressed gas or contacting said water with said gas, or heat recovery is accomplished while adding liquid phase water thereto or contacting it therewith.

Heat exchanging system for a heat engine

A method and system for operating a regenerative gas turbine in which a compressed gaseous medium is saturated with steam from untreated water having impurities in a first contact chamber and then supplied to a second chamber where the mixture is washed with pure water to remove impurities. The resulting mixture is mixed with fuel and combusted to supply gas to the turbine. Exhaust gas from the turbine is supplied to two serially connected regenerators which transfer heat to the recirculating untreated and pure water.

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Chiba, Japan

Hiromi Nakamura