Hino Motors, Ltd.

Sango Co., Ltd.

Hine Motors, Ltd.

Ichiro Tsumagari

Ryo Shibuya

Atsushi Koide

Shinya Sato

Yoshihiro Kawada

Takatoshi Furukawa

Makoto Tsujita

Yoshihide Takenaka

Koichi Machida

Shun Nakagawa

Masazumi Takayasu

The burner includes a first tube portion having a tube end including an ejection port and a second tube portion extending toward the ejection port in the first tube portion. The combustion gas generated by combusting air-fuel mixture is ejected from the ejection port. The second tube portion includes a heat exchanging portion that vaporizes liquid fuel with combustion heat of the combustion chamber and supplies the vaporized fuel to the premixing chamber. The outer surface of the second tube portion functions as a heat receiving surface of the heat exchanging portion. A fuel supply section of the burner is configured to vaporize liquid fuel and supply the vaporized fuel to the premixing chamber, and supply liquid fuel to the heat exchanging portion.

Burner

A burner includes a tubular inner tube portion and a tubular outer tube portion. The inner tube portion mixes fuel with air. The outer tube portion surrounds the inner tube portion. A peripheral wall of the inner tube portion has a gaseous mixture outflow hole. The gaseous mixture outflow hole causes a clearance between an inner peripheral surface of the outer tube portion and an outer peripheral surface of the inner tube portion to communicate with an interior of the inner tube portion. A peripheral wall of the outer tube portion has an air supplying hole. The air supplying hole further supplies air to the clearance.

A burner includes a first tube portion formed with an ejection port; a second tube portion that extends in the first tube portion toward the ejection port and to which gaseous mixture flows in from a side opposite to the ejection port; a third tube portion arranged in the first tube portion and including an open end positioned on the ejection port side; a closing portion that closes the open end; a coupling wall portion that closes a gap between the first tube portion and the second tube portion; a partition wall that is coupled to the first tube portion and the third tube portion, the partition wall being formed with a communication path; and an igniting portion that is arranged on the ejection port side with respect to the partition wall.

Injection nozzleand electrode rodsand(ignitor) are surrounded by double-cylinder flame stabilizer. Toroidal blocking platecloses between inner and outer cylindersandof the stabilizer at its distal end whose proximal end is connected with linefor introducing combustion airto between the cylinders. Inflow holesare formed throughout the inner cylinder at its proximal end. Peripheral finsare formed peripherally on the inner cylinder radially inwardly through cutting and bending-up at positions shifted from the inflow holes toward the distal end of the inner cylinder such that combustion air is introduced from circumferentially to form swirling flow inside the inner cylinder. End finsare formed on the blocking plate in fuel injection direction through cutting and bending-up such that combustion air is discharged circumferentially to form swirling flow around flame

Combustion appliance for raising the temperature of exhaust gas

An exhaust purifying system includes a selective reduction catalyst provided on an exhaust passage of an engine, a fluid supply device for supplying a urea fluid to a section of the exhaust passage that is upstream of the selective reduction catalyst, a gas separator for separating source gas into oxygen-enriched gas and nitrogen-enriched gas, an ozone generator that includes an ozone producing space, to which the oxygen-enriched gas is introduced, and produces ozone from the introduced oxygen-enriched gas, an ozone supplier for supplying ozone to a section of the exhaust passage that is upstream of the selective reduction catalyst, a vortex tube for separating the nitrogen-enriched gas into cool air and warm air and discharging the cool air and the warm air, and a cooling device for cooling the ozone producing space by applying the cool air discharged from the vortex tube to the ozone generator.

Exhaust gas purification system and ozone generator

A burner for an exhaust purifying device includes a tube, an air supply port for supplying air for combustion into the tube, a fuel supply port for supplying fuel into the tube, and an ignition portion. The tube includes a premixing chamber for mixing air for combustion and fuel to generate a pre-mixed air-fuel mixture, a combustion chamber for combusting the pre-mixed air-fuel mixture to generate post-combustion gas, and a discharge port for discharging the post-combustion gas. The ignition portion ignites the pre-mixed air-fuel mixture in the combustion chamber. The tube further includes a swirling flow generation unit arranged upstream of the premixing chamber for generating a swirling flow of which the center direction corresponds to a fuel injection direction and a diffusion unit arranged downstream of the swirling flow generation unit in the premixing chamber for diffusing the fuel incorporated in the swirling flow.

Burner for exhaust purifying device

This burner has: a flame stabilizer formed in a tubular shape; a fuel supply unit that supplies fuel within the flame stabilizer; an air supply passage that includes a heater unit for heating air and that supplies air heated by the heater unit into the flame stabilizer; and an ignition unit that ignites the air-fuel mixture of combustion air and fuel within the flame stabilizer.

Burner and filter renewal device

A burner includes a tube, which includes a pre-mixing chamber that generates an air-fuel mixture containing fuel and a combustion chamber that burns the fuel. A first pipe supplies fuel, which is heated by an electric heater to the pre-mixing chamber. A second pipe includes a heat exchange unit that converts combustion heat of the fuel to vaporization heat of the fuel and supplies fuel heated by the heat exchange unit to the pre-mixing chamber. The second pipe is branched from the first pipe at a branched point, and the electric heater and the heat exchange unit are connected in parallel to the pre-mixing chamber.

A burner for exhaust gas purification devices, comprising a base, a first pipe section, and a second pipe section. The first pipe section has a base end section, a tip section, a combustion chamber wherein combustion air and fuel are combusted, and a discharge port from which combusted gas is discharged. The base end section is fixed to the base. An air flowpath through which combustion air passes is provided between the first pipe section and the second pipe section. The burner for exhaust gas purification devices also comprises a compressable blocking section fixed to the first pipe section or the second pipe section, and interposed between the tip section of the first pipe section and the second pipe section. The entire perimeter of the tip section of the first pipe section is supported so as to be slidable relative to the second pipe section, via the blocking section.

Burner for exhaust gas purification devices

A burner for exhaust gas purification devices, comprising a base section, a first pipe section, and a second pipe section. The first pipe section has abase end section, a tip section, a combustion chamber, and a discharge port from which combusted gas is discharged. The base end section and the tip section are fixed to the base section. The second pipe section has a base end section and a tip section, and said base end and tip sections are fixed to the base section. The first pipe section also comprises an expansion/contraction section capable of expanding and contracting in a direction parallel to the central axis. The first pipe section and the second pipe section mutually overlap in the radial direction so as to form a multilayer tube structure.

Enabled is reliable detection of abnormality in a NOemission control system. Disclosed is a method for detecting abnormality in an exhaust emission control device with a reducing agent (urea water) being added to selective reduction catalystincorporated in an exhaust pipeso as to reduce and purify NO. Temperature of the catalyst during an operation period is monitored to record a cumulative time for each of temperature zones. On the basis of the recorded cumulative time for each of the temperature zones, a deterioration coefficient of NOreduction performance is determined for each of the temperature zones. A standard NOreduction ratio predetermined for each of the temperature zones is multiplied by the determined deterioration coefficient for each of the temperature zones to update the standard NOreduction ratio. The updated standard NOreduction ratio is used in a next operation to compare an actually measured NOreduction ratio with the standard NOreduction ratio on the measured temperature zone. It is determined that there is abnormality when deviation of the actually measured NOreduction ratio from the standard NOreduction ratio does not fall within a required range.

Method for detecting abnormality in exhaust emission control device

Excessive generation NOby oxidation catalyst arrangement upstream of a selective reduction catalyst is suppressed to prevent falling of NOreduction rate. A selective reduction catalystcapable of selectively reacting NOwith ammonia even in the presence of oxygen is incorporated in an exhaust pipefrom an engine. A pair of oxidation catalystsA andB are arranged in parallel with each other and upstream of the selective reduction catalyst. In an operation condition with low exhaust temperature, amounts of the exhaust gasdistributed to the oxidation catalystsA andB are adjusted so as to make NO/NOratio in the exhaust gasto about 1-1.5. In an operation condition with higher exhaust temperature where the NOreduction rate is less affected by the NO/NOratio, as a countermeasure against increasing, leaking ammonia, passage changeover is conducted to pass the exhaust gasin backflow through the selective reduction catalystand the oxidation catalystsA andB, so that ammonia passing through the selective reduction catalystwithout reacted is oxidized in the oxidation catalystsA andB.

Exhaust gas purification apparatus

Urea water is added to a catalyst in an exhaust pipe for purification. A first-order lag response model corresponding to the exhaust temperature upstream of the catalyst estimates catalyst temperature for each of divided cells of the catalyst. Cell volumes for each of temperature zones are summed on the basis of the estimated temperatures for the cells. The summation for each temperature zone is divided by the whole catalyst volume to determine temperature distribution volume ratio. The ratio for each of the temperature zones is multiplied by a reference injection amount of the urea water determined in consideration to a current engine operation status on the assumption that the catalyst temperatures are all within the temperature zone. The calculated values for the respective temperature zone are summed into a directive injection amount of the urea water.

Method for controlling exhaust emission control device

When urea water U is injected by an addition nozzleupstream of NOreduction catalystincorporated in an exhaust passageof a diesel engineso as to reduce and purify NOin exhaust G, both a value measured by a NOconcentration sensorupstream of the nozzleand a value measured by a NOconcentration sensordownstream of the catalystare corrected by using a primary response model depending upon a flow rate and a temperature of exhaust G. The NOreduction ratio is obtained on the basis of these corrected NOconcentration values. Rectified are time lag of measuring of a value by the downstream NOconcentration sensorfrom measuring of a value by the upstream NOconcentration sensorin a case of the exhaust G having a lower flow rate, and error due to lowering of NOreduction processing speed in a case of the exhaust having a lower temperature.

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Hino, Japan

Ichiro Tsumagari