A technique for reducing and removing mercury in industrial gases, such as a flue gas (16), produced by the combustion of fossil fuels, such as coal (24), adds hydrogen sulfide and/or sulfide ions from a supply system (50) to the flue gas (16) as it passes through a scrubber (30). The scrubber may be either a wet or dry scrubber for flue gas desulfurization systems.

In an outboard marine drive, a primary partition (18) made of elastomeric material is provided in a lower part of the extension case (6), and a drive shaft (5) and an exhaust pipe (17) are sealingly passed through the primary partition (18). Thereby, the extension case (6) is kept out of direct contact from the exhaust gas, and is therefore prevented from excessive heating. The exhaust pipe and the drive shaft typically have a large length, and it is advantageous to support them at parts thereof near a lower end thereof. The use of elastomeric material for the primary partition (18) is particularly advantageous because it not only can favorably insulate heat but also can accommodate any positional errors in the exhaust pipe and the drive shaft relative to the extension case. When a secondary opening is formed in an upper part of the exhaust pipe to prevent excessive build up of exhaust back pressure when the engine is idling, a secondary partition may also be provided in an upper part of the extension case.

An outboard motor (1) includes an exhaust emission control system which is arranged rationally and neatly in the housing of an outboard motor body, irrespective of various limitations on the outside shape of the housing. An oil pan (100) disposed below an engine (11) of the outboard motor (1) has an oil holding portion (101), and an exhaust pipe (110) is disposed vertically along a vertical wall portion of the oil holding portion A catalytic converter (120) is disposed in an intermediate portion of the exhaust pipe (110) in confronted relation to the vertical wall portion. The catalytic converter (120) has a particular shape in horizontal section which is greater in side in a first direction than in a second direction perpendicular to the first direction. A fresh-air delivery passage (20) is provided for introducing fresh air into an exhaust passage disposed upstream of the exhaust pipe (110). The fresh-air delivery passage (20) is connected at one end to the top plate of an intake box (25) and includes a check valve (21) disposed at an intermediate portion of the fresh-air passage. The check valve (21) is adapted to open only when the pressure in the exhaust passage is less than the atmospheric pressure. The exhaust system is perfectly protected against a possible entry of water, and an engine combustion failure and corrosion of the exhaust system resulting therefrom.

Beschrieben und dargestellt ist ein Gaswäscher (1), insbesondere zur Entschwefelung von Rauchgasen, vorzugsweise zur Installation auf einem Schiff, mit einem Wäschergehäuse (3) und einem unterhalb des Wäschergehäuses (3) angeordneten Gasrohr (2) zum Heranführen des im Wäschergehäuse (3) zu waschenden Gases, wobei das Wäschergehäuse (3) einen durch einen Wäscherboden (7), einen Wäscherkopf (5) und einen zwischen dem Wäscherboden (7) und dem Wäscherkopf (5) vorgesehenen Wäschermantel (6) abgegrenzten Wäscherraum (4) aufweist. Um einen zuverlässigeren Betrieb zu erreichen, ist vorgesehen, dass im Bereich des Wäschermantels (6) eine Gaszuführung (13) zum seitlichen Einleiten von Gas über wenigstes eine Öffnung (19) in den Wäscherraum (4) vorgesehen ist.

The present application relates to a spray tower (1) arranged to be vertically positioned and having an inner space (100), wherein the spray tower comprises, a central exhaust gas pipe (7) arranged for introducing exhaust gas into the inner space of the spray tower through an exhaust gas inlet (2) positioned at a proximal end (7b) of the central exhaust gas pipe, the central exhaust gas pipe being positioned at a bottom end (1a) of the spray tower in installed position, the central exhaust gas pipe being in fluid connection with the inner space of the spray tower through an exhaust gas inlet at a top end (7b) of the central exhaust gas pipe, and at least one exhaust gas outlet (3) arranged for withdrawing purified exhaust gas from the inner space of the spray tower, the exhaust gas outlet being positioned at a top end (1b) of the spray tower in installed position, the exhaust gas outlet being in fluid connection with the inner space of the spray tower, wherein from the exhaust gas inlet to the exhaust gas outlet, a general exhaust gas flow is passing through the inner space of the spray tower, one or more spray devices (41, 42) configured to provide a stream of scrubber liquid within the inner space of the spray tower counter current to the general exhaust gas flow, and at least two engine exhaust gas pipes (6) being in fluid connection with the distal end of the central exhaust gas pipe. Furthermore, a method for reducing the amount of SOx in exhaust gas is described.

An engine (6, 206) includes a cylinder block (19) including a plurality of cylinders (18) disposed along a V-shaped line (V1), a pair of exhaust manifolds (25) disposed inside the V-shaped line, and an exhaust pipe (26, 226) disposed inside the V-shaped line (V1). Each of the pair of exhaust manifolds (25) includes a first passage (49) that includes a plurality of inflow ports (49a) into which exhaust gases from the cylinders (18) flow, a collecting portion (49c) at which exhaust gases are collected, and an exhaust port (49b) from which exhaust gases are discharged. The exhaust pipe (26, 226) includes a connection passage (50, 250) that includes a pair of intermediate inflow ports (50a) that are connected to the exhaust ports (49b), at least one intermediate exhaust port (50b) from which exhaust gases are discharged. The connection passage (50, 250) is arranged to connect the pair of intermediate inflow ports (50a) and the at least one intermediate exhaust port (50b).

A ship comprises: a hull; an engine for propelling the hull; a harmful substance reducing device for reducing harmful substances included in exhaust gas discharged from the engine; and a preheating device for the harmful substance reducing device, preliminarily heating the harmful substance reducing device when the hull is located at an emission control area (ECA) preliminary entry point close to an ECA in which the emission of the harmful substances is restricted. The ship comprises: the hull; the engine for propelling the hull; the harmful substance reducing device for reducing the harmful substances included in the exhaust gas discharged from the engine; and an engine output control device for controlling the output of the engine to be lowered so as to reduce the amount of the exhaust gas discharged from the engine when the hull is located in the ECA or at the ECA preliminary entry point.

A duct arrangement for an internal combustion engine comprises an exhaust duct, an inlet duct and a cooling air duct. The exhaust duct is contained within the cooling air duct for substantially its whole length and the cooling air duct is contained within the inlet duct for substantially its whole length, so that in use the cooling air duct provides a barrier to limit heat transfer between gas flowing in the exhaust duct and gas flowing in the inlet duct. The invention avoids the need for separate inlet and exhaust ducts with their attendant disadvantages. The separation of the inlet and exhaust ducts by the cooling air duct allows the inlet air to be kept as cool as possible, as is necessary for efficient engine operation.

A scrubber 31 includes: an exhaust gas inflow passage 41 through which a high-temperature exhaust gas is introduced; an injecting portion 42 configured to inject clean water to the exhaust gas introduced through the exhaust gas inflow passage 41; an upper chamber 43 including a bottom surface configured to receive the clean water injected from the injecting portion 42; a lower chamber 44 located under the upper chamber 43; a communication pipe 45 which extends downward from the bottom surface 51 of the upper chamber 43, in which an opening portion 57 of a lower portion of the communication pipe 45 is open in the lower chamber 44, through which the clean water received by the bottom surface 51 of the upper chamber 43 is discharged to the lower chamber 44, and through which the exhaust gas in the upper chamber 43 is accelerated to be introduced to the lower chamber 44; and an exhaust gas outflow passage 46 through which the exhaust gas having been introduced to the lower chamber 44 is suctioned and discharged from the lower chamber 44.