Mitsubishi Jukogyo Kabushiki Kaisha

Chubu Electric Power Company, Inc.

Tsuneo Higashi

Tadashi Tanaka

Masami Kato

Katsuaki Makino

Satoshi Nakamura

Hiroshi Miyamoto

Takeshi Sakai

Hiroshi Fujiike

Tsuyoshi Ohishi

Akio Izuwa

Hiroshi Fujike

Masahiko Nakao

Katsutoshi Yata

Yasuki Nishimura

In a coal-fired boiler, a heat recovery unit is located upstream of a dry electrostatic precipitator so as to reduce the temperature of exhaust gas flowing to the dry electrostatic precipitator and thus prevent reverse ionization in the electrostatic precipitator. The heat recovery unit located upstream of the dry electrostatic precipitator will in no way be corroded even if the concentration of dust is reduced in the dry electrostatic precipitator. A desulfurization unit does not require a cooling/dust removing section and eliminates the need for a wet electrostatic precipitator. The dry electrostatic precipitator includes a gas passage divided into a plurality of parallel passages and dampers operable to close the passages. This arrangement prevents dust from being dispersed as a result of hammering without charge.

Method and system for handling exhaust gas in a boiler

A method for removing soot or the like adhered to heat transfer tubes of a heat-exchanger by providing a steel ball scatterer above the heat transfer tubes and intermittently scattering steel balls towards the heat transfer tubes, is improved. The improvements reside in that a steel ball scattering rate is set to a small initial rate at the commencement of the scattering operation and thereafter is increased either in a stepwise manner or continuously. Preferably, within a main body casing of the heat-exchanger, a plurality of steel ball collision preventing plates having their central portions extending convexly upwards are provided between the steel ball scatterer and the heat transfer tube group, in order to prevent fins of the heat transfer tubes from being damaged by steel balls falling from the steel ball scatterer and directly colliding against the fins.

Method for removing soot by scattering steel balls in a heat-exchanger

A method for removing soot or the like adhered to heat transfer tubes of a heat exchanger by providing a steel ball scatterer above the heat transfer tubes and intermittently scattering steel balls towards the heat transfer tubes. The improvements reside in that the steel ball scattering rate is set to a small initial rate at the commencement of the scattering operation and thereafter is increased either in a stepwise manner or continuously. Preferably, within a main body casing of the heat exchanger, a plurality of steel ball collision preventing plates having their central portions extending convexly upwards are provided between the steel ball scatterer and the heat transfer tube group, in order to prevent fins of the heat transfer tubes from being damaged by steel balls falling from the steel ball scatterer and directly colliding against the fins.

A supercooling type mist eliminator apparatus has a crimped-plate type mist eliminator for removing particles of dust and mist contained in a wet exhaust gas by inertial collision. The apparatus has an exhaust gas cooling device disposed upstream of the crimped-plate type mist eliminator including supercooling elements and non-cooling sections alternately disposed adjacent to one another via a gas passageway partition plate along a plane perpendicular to the direction of the gas flow in the gas passageway. An exhaust gas mixing device is disposed upstream of the crimped-plate type mist eliminator and just behind and close to the exhaust gas cooling device.

Supercooling type mist eliminator apparatus

Growing community of inventors

Mihara, Japan

Tsuneo Higashi