JP2010512500A - Burner assembly - Google Patents

Abstract

The invention is achieved by injecting fuel and combustion air into the combustion chamber of a boiler, which is attached to the outer wall (22) of the casing of a boiler, in particular a marine boiler, through an inlet opening (24) in the casing. The present invention relates to a burner assembly for heating a boiler. The burner assembly communicates with the tubular portion through a burner housing (21) having a tubular portion (27) having a first axis A2 and a propeller propulsion chamber outlet portion (30) having a second axis A3. A combustion air propeller propulsion chamber (28). As a result, combustion air is discharged from the outlet portion of the propeller propulsion chamber into the tubular portion described above in a direction substantially parallel to the second axis. According to the present invention, the angle between the first axis and the second axis is between approximately 50 and 90 degrees, most preferably between 50 and 60 degrees. With the burner assembly according to the invention, the torque and vibration forces exerted on the boiler wall by the burner assembly on the mounting means (25) of the assembly are considerably reduced.

Description

  The present invention relates to a burner assembly for mounting on the outer wall of a casing of a boiler, in particular, but not exclusively, of a marine boiler for use on a marine vessel.

  A related type of conventional burner assembly has a tubular portion, and the airflow leaving the fan wheel through the propeller propulsion chamber exit portion is reduced to minimize pressure loss, as shown in FIG. 1 of the drawings. In order to remain as straight as possible, they are substantially in-line (the first axis and the second axis are coincident or parallel to each other).

  The prior art assembly has the problem that the main part of the burner assembly must be hinged to the wall of the boiler casing to allow maintenance or replacement of the fuel injection nozzle. Maintenance or replacement operations are difficult to perform, particularly in the case of marine boilers on marine vessels.

  Furthermore, the distance between the attachment means for attachment to the boiler casing and the center of gravity of the hinged portion of the assembly is relatively long, causing a considerable torque force on the attachment means. The torque force comes from the mass of the supported part, gravity, and all other vibrations and movements of the boiler casing when the marine vessel is sailing. This creates a need for relatively expensive attachment means and relatively high structural strength of the housing of the burner assembly.

  In view of the above, an object of the present invention is to solve the problems of related types of prior art burner assemblies.

The invention relates to a boiler, in particular a marine boiler for use on a marine vessel, which is mounted on the outer wall of a casing and allows fuel and combustion air to enter the combustion chamber of the boiler through an inlet opening in the casing. A burner assembly for heating the boiler by pouring;
Attachment means for attaching the assembly to the casing around the inlet opening;
With a burner housing,
The burner housing is
A tubular portion for directing the combustion air to the inlet opening, the tubular portion having a first shaft, a first end adjacent to the inlet opening, and an opposite second end; Have
A fuel injection nozzle disposed in the tubular portion in the vicinity of the first end for injecting fuel into the combustion air;
A combustion air propeller propulsion chamber in communication with the second end through a propeller propulsion chamber outlet portion having a second shaft, so that the combustion air passes from the outlet portion to the second Into the end in a direction substantially parallel to the second axis,
The present invention relates to a burner assembly having a fan wheel that rotates in the propeller propulsion chamber and propels combustion air to the outlet portion.

  According to the present invention, the object, further objects and advantages of the present invention are that the angle between the first axis and the second axis is between approximately 30 and 90 degrees, preferably It is achieved by between 35 and 80 degrees, more preferably between 35 and 70 degrees, and most preferably between 40 and 60 degrees.

  This significantly reduces the distance between the center of gravity and the mounting means, resulting in a reduction in torque force applied to the mounting means and the housing of the assembly. In addition, access to the fuel nozzle is possible without rocking most of the burner assembly about the hinge.

  It is desirable that the first axis and the second axis are arranged in a substantially parallel plane or a substantially common plane, and that these planes are substantially vertical.

To achieve a relatively simple and easy maintenance or replacement of the fuel nozzle,
The fuel injection nozzle includes a proximal end of a fuel lance extending through the tubular portion from near the first end to an opposite distal end substantially parallel to the first axis. Placed in
The lance and the housing are adapted and configured to allow longitudinal movement of the lance out of the housing in a direction away from the first end of the tubular portion, so that the nozzle The nozzle is accessible outside the housing for maintenance or replacement.

  In the prior art burner assembly of the type in question, the combustion air intake to the fan wheel chamber is located laterally on the housing, on the opposite side of the motor for driving the fan wheel. As a result, the air flow is in the axial direction of the rotating shaft of the fan wheel and parallel to the rotating shaft. This requires space on the side of the assembly, and the arrangement of the air intake is relatively easy for foreign objects to enter, blocking air intake or damaging the fan wheel.

  In the burner assembly according to the present invention, an air intake opening for taking combustion air into the propeller propulsion chamber is arranged in the wall of the propeller propulsion chamber, and the air intake opening is in relation to the outer periphery of the fan wheel. Substantially tangentially, so that combustion air flows substantially radially into the propeller propulsion chamber relative to the center of the fan wheel.

  This reduces the space requirements and makes the air intake opening integral with the housing.

  Preferably, the parallel or common plane is vertical and the air intake opening is located near the bottom of the propeller propulsion chamber so that combustion air flows substantially vertically into the propeller propulsion chamber. . This reduces the risk of foreign matter entering the air intake opening.

  The arrangement of the air intake openings as described above may of course be applied to prior art burner assemblies with at least some of the same advantages.

  In the presently preferred embodiment, a control device and a switch are disposed on the housing. In prior art assemblies, the controller and switch are located on a control panel remote from the burner assembly, partly because of the need to swing the unit away on a hinge. By combining the controller and switch into the housing of the assembly, a self-contained unit is obtained. In addition, the operator can obtain a better view and can easily access (access) the control means.

  However, positioning the control means on a housing as described above may also be applied to prior art burner assemblies with at least some of the same advantages.

1 is a side elevation view of a prior art burner assembly installed on the wall of a cylindrical boiler having a vertical axis. FIG. 1 is a side elevational view of a presently preferred embodiment of an angular burner assembly according to the present invention installed on the wall of a cylindrical boiler having a vertical axis. FIG. FIG. 3 is a partially cutaway perspective view of the burner assembly in FIG. 2 with a modified combustion air intake structure.

  In the following, the invention will be described and explained in more detail with regard to the presently preferred embodiment, which is illustrated solely by way of example in the accompanying drawings.

  Referring now to FIG. 1, a prior art straight burner assembly is mounted on a cylindrical wall 2 of a boiler with a vertical axis by a flange 3 adjacent to the end of an inlet opening 4 in the wall 2. A housing 1 is provided. The flange 3 is fixed to the wall 2 by a number of bolts 5 and one top bolt 6. The function of the latter bolt 6 will be described later.

  The housing has an axis A1, a tubular part 7 for directing combustion air to the inlet opening 4, and a combustion air in the direction of arrow R2 through a propeller propulsion chamber outlet 10 having the same axis A1 as the axis of the tubular part 7. And a combustion air propeller propulsion chamber 8 containing a fan or propeller 9 that rotates in the direction of the arrow R1. The propeller 9 is driven by an electric motor (not shown) connected to one propeller shaft 9a having a distance D1 from the mounting flange 3.

  A combustion air intake (not shown) for the propeller propulsion chamber is mounted next to the propulsion chamber opposite the motor. As a result, air enters the propulsion chamber 8 in a direction parallel to the propeller shaft 9a.

  A burner lance 11 with a fuel nozzle 12 for injecting fuel into the combustion air is arranged inside the tubular part 7. A fuel nozzle is mounted at one end of the lance. The burner lance extends along the axis A1 through the tubular part 7 to the opposite end with connecting means 11a connecting the lance to fuel supply conduit means (not shown).

  The tubular portion includes two portions 7a and 7b. Each part has a flange 3a and 3b, respectively, and is connected to each other by a hinge 13 in a hinged manner. As a result, when the bolt 6 is removed, the flange 3b will rotate around the hinge 13 in the direction of arrow R3.

  When the fuel nozzle 12 requires maintenance or replacement, the bolt 6 is removed. Also, the entire unit including the lance 11 with the portion 7b, the propulsion chamber 8 and the nozzle 12 rotates clockwise around the hinge 13 until the nozzle 12 is accessible for maintenance or replacement.

  Since the unit to be rotated can weigh more than half a ton, this maintenance operation that requires rocking the unit around the hinge 13 is not a lightly undertaken operation. In particular, when the boiler is a marine boiler, maintenance is generated during the voyage of the ship on which the boiler is installed.

  The torque force acting on the mounting flange 3 is a function of the distance D1 between the propeller shaft 9a and the flange 3 when the propeller shaft approaches the center of gravity of the unit.

  When the boiler is installed on the ship, the static torque force due to gravity is supplemented by the dynamic torque force due to ship movement at sea and vibrations in the ship.

  The larger the burner unit, the greater the weight (mass), and the greater the distance D1. Thus, some problems associated with prior art burner assemblies increase approximately exponentially with the size of the burner assembly.

  Furthermore, the fuel supply conduit means connected to the connecting means 11a must include a flexible hose that allows the unit to rotate. Such hoses are prone to leakage, especially when bent by the rotation of the unit.

  Referring now to FIG. 2, a cornered burner assembly according to one embodiment of the present invention includes a flange 23 adjacent to a cylindrical wall 22 of a boiler having a vertical axis and adjacent to an end of an inlet opening 24 in the wall 22. Has a burner housing 21 attached by The flange 23 is fixed to the wall 22 by a large number of bolts 25.

  The housing has an axis A2 and burns in the direction of arrow R5 through a tubular portion 27 for directing combustion air to the inlet opening 24 and a propeller propulsion chamber outlet 30 having an axis A3 extending at an angle V relative to the axis A2. A combustion air propeller propulsion chamber 28 containing a fan or propeller 29 that rotates in the direction of arrow R4 is provided to propel the working air. The two axes A2 and A3 are located in a common plane which is preferably vertical as shown in FIG. However, the common plane may be horizontal, and more specifically, may have any angle with respect to the horizontal.

  The two axes are not necessarily located in a common plane. The tubular portion 27 may be offset (displaced) relative to the propeller propulsion chamber so that the two axes are in their respective planes. However, it is desirable that such planes be parallel.

  The propeller 29 is driven by an electric motor (not shown) connected to a propeller shaft 29a having a distance D2 from the mounting flange 23. According to the illustrated embodiment of the invention, the shaft 29a extends substantially perpendicular to the plane containing the axes A2 and A3 (the plane stretched by the axes A2 and A3). However, this feature cannot be considered a limitation.

  A combustion air intake (not shown) for the propeller propulsion chamber is mounted next to the propulsion chamber opposite the motor. As a result, air enters the propulsion chamber 28 in a direction parallel to the propeller shaft 29a.

  A burner lance 31 having a fuel nozzle 32 for injecting fuel into the combustion air is arranged inside the tubular part 27. A fuel nozzle is mounted at one end of the lance. The burner lance extends along the axis A2 through the tubular part 27 to the outside of the housing 21 and extends to the opposite end with connecting means 33 connecting the lance to a fuel supply conduit (not shown). is doing.

  The device and switch 35 are mounted on the rear surface of the housing 21. In prior art burner assemblies, such devices are mounted on the control panel separately from the assembly, partly because most of the unit needs to be swung for maintenance. By mounting the device and the switch in the housing itself, a self-contained unit with good working conditions for the operator is obtained.

  When the fuel nozzle 32 requires maintenance or replacement, the lance 31 is withdrawn from the housing 21 by displacing it in a longitudinal direction away from the inlet opening 24. Thus, maintenance or replacement of the nozzle 32 requires a relatively very simple and easy operation compared to the prior art burner assembly of FIG. Furthermore, the fuel supply conduit means connected to the coupling means 33 can be a fixed installation without a flexible hose, thereby substantially reducing the risk of leakage.

  The torque force acting on the mounting flange 23 is a function of the distance D between the propeller shaft 29a and the flange 23 when the propeller shaft approaches the center of gravity of the portion located outside the boiler wall 22 of the burner assembly. .

  Thus, it is clear that the torque force acting on the mounting flange 23 is much smaller than in the prior art assembly of FIG. 1 for the same size burner assembly. This allows a substantial savings in the structure of the flange 23 and the structural strength of the tubular portion 27, thereby reducing the weight of the burner assembly.

In the following table, a comparison is made between the prior art burner assembly of FIG. 1, for example a Weishaupt Monarch oil burner, and a burner assembly according to the present invention.

  Referring now to FIG. 3, a burner assembly that is very similar to the assembly shown in FIG. 2 is shown in a partially cut away view. Thereby, the arrangement of the combustion air intake 36 having an electric motor (not shown) for operating the damper 37 for adjusting the flow of the combustion air is shown. The position of the electric motor 38 for rotating the propeller 29 is also shown.

This arrangement, where the air intake is right next to the fan 29 and inside and at the bottom of the housing,
By facing downward from the bottom of the housing, there is an advantage that the risk of foreign matter entering the air intake is reduced. Furthermore, the space requirements of the burner assembly are reduced, thus reducing costs and allowing a more streamlined design.

Claims (8)

By injecting fuel and combustion air into the combustion chamber of the boiler through an inlet opening in the casing, attached to the outer wall of the casing of a boiler, particularly for a ship boiler for use on a marine vessel A burner assembly for heating the boiler,
Attachment means for attaching the assembly to the casing around the inlet opening;
With a burner housing,
The burner housing is
A tubular portion for directing the combustion air to the inlet opening, the tubular portion having a first shaft, a first end adjacent to the inlet opening, and an opposite second end; Have
A fuel injection nozzle disposed in the tubular portion in the vicinity of the first end for injecting fuel into the combustion air;
A combustion air propeller propulsion chamber in communication with the second end through a propeller propulsion chamber outlet portion having a second shaft, so that the combustion air passes from the outlet portion to the second Into the end in a direction substantially parallel to the second axis,
Having a fan wheel that rotates in the propeller propulsion chamber and propels combustion air to the outlet portion;
The angle between the first axis and the second axis is between approximately 50 degrees and 90 degrees, preferably between 50 degrees and 80 degrees, more preferably between 50 degrees and 70 degrees. Burner assembly, characterized in that it is between 50 degrees and most preferably between 50 and 60 degrees. The burner assembly according to claim 1.
The burner assembly according to claim 1, wherein the first axis and the second axis are arranged in a substantially parallel plane or a substantially common plane. The burner assembly according to claim 2, wherein
The burner assembly characterized in that the parallel plane or the common plane is substantially vertical. The burner assembly according to any one of claims 1 to 3,
The fuel injection nozzle includes a proximal end of a fuel lance extending through the tubular portion from near the first end to an opposite distal end substantially parallel to the first axis. Placed in
The lance and the housing are adapted and configured to allow longitudinal movement of the lance out of the housing in a direction away from the first end of the tubular portion, so that the nozzle A burner assembly wherein the nozzle is accessible outside the housing for maintenance or replacement of the housing. The burner assembly according to any one of claims 1 to 4,
An air intake opening for taking combustion air into the propeller propulsion chamber is disposed in the wall of the propeller propulsion chamber, the air intake opening being substantially tangential to the outer periphery of the fan wheel, As a result, the combustion air flows substantially radially into the propeller propulsion chamber relative to the center of the fan wheel. The burner assembly according to claim 6.
The parallel plane or the common plane is vertical, and the air intake opening is disposed near the bottom of the propeller propulsion chamber, so that combustion air flows substantially vertically into the propeller propulsion chamber. A burner assembly characterized by that. The burner assembly according to any one of claims 1 to 6,
A burner assembly, wherein the propeller shaft extends substantially perpendicular to the plane supported by the first and second axes. The burner assembly according to any one of claims 1 to 7,
A burner assembly comprising a controller and a switch disposed on the housing.

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