Air supply device of gas engine

Patent metadata

Field	Value
Publication number	US-9267425-B2
Application number	US-201113979021-A
Country	US
Kind code	B2
Filing date	Sep 30, 2011
Priority date	Feb 28, 2011
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

An air supply device of a gas engine having a turbocharger includes a first intake passage configured to guide the mixture of outdoor air and unpurified gas into the turbocharger, a second intake passage configured to guide indoor air into the turbocharger, a filter configured to remove a solid impurity in the unpurified gas which is disposed in the first intake passage, a first damper capable of opening and closing the first intake passage disposed on the downstream side of the filter in the first intake passage, a heating unit for heating the indoor air disposed in the second intake passage, a second damper capable of opening and closing the second intake passage disposed on the downstream side of the heating unit in the second intake passage, and a damper control device configured to control the opening degree of each of the first and second dampers.

First claim

The invention claimed is:

1. An air supply device of a gas engine, which is located in a facility provided at a gas source, including a turbocharger, comprising:
a first intake passage configured to guide a mixture of outdoor air obtained from outside of the gas source and unpurified gas discharged from the gas source into the turbocharger;
a second intake passage configured to guide indoor air obtained from an inside of the facility into the turbocharger;
a filter configured to remove a solid impurity in the unpurified gas, the filter being disposed in the first intake passage;
a first damper capable of opening and closing the first intake passage, the first damper being disposed on a downstream side of the filter in the first intake passage;
a heating unit for heating the indoor air, the heating unit being disposed in the second intake passage;
a second damper capable of opening and closing the second intake passage, the second damper being disposed on a downstream side of the heating unit in the second intake passage; and
a damper control device configured to control an opening degree of each of the first damper and the second damper.

2. The air supply device of a gas engine according to claim 1 , further comprising:
an outdoor air temperature gauge configured to detect a temperature of the mixture of the outdoor air and the unpurified gas; and
an indoor air temperature gauge configured to detect a temperature of the indoor air,
wherein the damper control device comprises:
a temperature determination section configured to determine whether a first condition in which a temperature of the outdoor air is lower than a predetermined specific temperature and the temperature of the indoor air is higher than the temperature of the outdoor air is satisfied or a second condition in which the temperature of the outdoor air is higher than the predetermined specific temperature or the temperature of the outdoor air is higher than the temperature of the indoor air is satisfied; and
a damper opening degree control section, based on the determination of the temperature determination section, configured to close the first damper and open the second damper when the first condition is satisfied, and configured to open the first damper and close the second damper when the second condition is satisfied.

3. The air supply device of a gas engine according to claim 2 , wherein:
the predetermined specific temperature is a first predetermined specific temperature,
the temperature determination section is configured to determine whether a third condition in which the temperature of the outdoor air is higher than the first predetermined specific temperature and is lower than a second predetermined specific temperature set so as to be higher than the first predetermined specific temperature is satisfied, a fourth condition in which the temperature of the outdoor air is higher than the second predetermined specific temperature and is lower than the temperature of the indoor air is satisfied, or a fifth condition in which the temperature of the outdoor air is higher than the second predetermined specific temperature and is higher than the temperature of the indoor air is satisfied, and
the damper opening degree control section is configured to open the first damper and close the second damper when the third condition or the fourth condition is satisfied based on the determination of the temperature determination section, and is configured to close the first damper and open the second damper when the fifth condition is satisfied based on the determination of the temperature determination section.

4. The air supply device of a gas engine according to claim 2 , wherein the damper opening degree control section comprises a damper operation delay unit configured to close the first damper on condition that the second damper is opened when the first condition is satisfied, and configured to close the second damper on condition that the first damper is opened when the second condition is satisfied.

5. The air supply device of a gas engine according to claim 1 , further comprising a pressure difference detection unit configured to detect a pressure difference between an upstream side and the downstream side of the filter,
wherein the damper control device is configured to open the second damper when the pressure difference is not less than a predetermined specific pressure difference, and is configured to close the second damper when the pressure difference is less than the predetermined specific pressure difference.

6. The air supply device of a gas engine according to claim 5 , further comprising:
a rotation rate gauge configured to detect a rotation rate of the turbocharger;
an intake air amount gauge configured to detect an intake air amount supplied to the turbocharger,
a pressure gauge configured to detect a pressure of air turbocharged by the turbocharger which is a supplied air pressure; and
a pressure ratio calculation unit for calculating a pressure ratio based on a detected value of the pressure gauge and an atmospheric pressure, the pressure ratio being between the supplied air pressure and the atmospheric pressure,
wherein the pressure difference detection unit comprises:
a pressure difference map configured to store a relationship of the rotation rate of the turbocharger, the intake air amount supplied to the turbocharger, and the pressure ratio between the supplied air pressure and the atmospheric pressure, the pressure difference map being pre-generated on condition that there is no increase in the pressure difference of the filter; and
a pressure difference determination section configured to determine that the pressure difference is not less than the predetermined specific pressure difference when the rotation rate of the turbocharger detected by the rotation rate gauge is larger than the rotation rate of the turbocharger determined from the pressure difference map on conditions of the intake air amount detected by the intake air amount gauge and the pressure ratio calculated by the pressure ratio calculation unit by a predetermined specific amount or more.

7. The air supply device of a gas engine according to claim 1 , wherein
the gas engine is configured to use coal mine methane as fuel, and
the unpurified gas comprises VAM (Ventilation Air Methane) discharged from a mine.

Assignees

• Suzuki Hajime
• Shimizu Yuuichi
• Nishio Hideki
• Mitsubishi Heavy Ind Ltd

Inventors

• Suzuki Hajime
• Shimizu Yuuichi
• Nishio Hideki

Classifications

• F02B37/00

  Engines characterised by provision of pumps driven at least for part of the time by exhaust · CPC title

• F02M35/108

  with primary and secondary intake passages · CPC title

• F02D2200/0402

  the parameter being determined by using a model of the engine intake or its components · CPC title

• Y02T10/144

  Cross-Sectional Technologies · mapped topic

• F02D2200/703

  Atmospheric pressure · CPC title