GENERAL DESCRIPTION 17 October 2005
Revision Number 0INSTALLATION,
COMMISSIONING, OPERATION &
MAINTENANCE MANUAL Document I.D.VS.A1.0.General Description
A1.1Principle and Design
(Reference: Section H1 (Illustrations)- VS Blower Component Identification drawing.)
The VS Short Retracting Blower is a soot blower ud for cleaning slag from furnace walls. The basic element is a nozzle head normally equipped with a single venturi nozzle head.
When the blower is started, from the idle position, the nozzle head advances into its blowing position behind the internal tube wall. At this point the blower valve opens and the nozzle rotates according to t
he required blowing arch. After completion of the blowing arc, the feed of blowing medium is shut off and the nozzle head retracts to its original position in the wall sleeve.Straight-line and rotating movements are initiated by the screw tube which is attached to the nozzle head. A single, high-efficiency gearmotor drive asmbly provides power for all motion of the unit.
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MAINTENANCE MANUAL Document I.D.VS.A2.0.
有魔力的英文A2.1BLOWER FRAME
(Reference: Section H1 (Illustrations) – VS Blower Component Identification drawing.)
The blower frame is compact, but sturdy. The frame is constructed from structural steel angle
and heavy steel plate. The welded frame ensures rigidity of the entire unit. The valve plate is
bolted into position for ea of maintenance.
Top, side, and poppet valve covers protect workers from the blower’s moving parts during
operation. The covers are easily removable for maintenance.
A2.2BLOWER DRIVE AND CONTROL SYSTEM
(Reference: Section H1 (Illustrations) – VS Blower Component Identification drawing.)
The VS blower is driven by an AC gearmotor asmbly. This gearmotor drives the hub sprocket by means of a heavy duty chain.
The rotational motion of the hub sprocket assy. is transmitted to the screw tube by means of a
bronze threaded screw nut. A guide rod, located inside the blower frame, ensures proper
alignment of the blower internals and forces axial movement (straight-forward movement without blowing) of the screw tube. In the blowing position the guide rod and screw tube are no longer
engaged (the axial movement stops). At this point, the screw tube has screwed itlf fully into the bronze nut and is t into rotation by the sprocket.
The two limit switches are mounted to and wired to the terminal box ready for operation in the
workshop. They control the screw tube’s forward and rearward movements as well as the
blowing revolutions.
As required one or veral blowing revolutions can be performed.
A2.3SCREW TUBE, FEED TUBE AND VALVE ACTUATION
(Reference: Section H1 (Illustrations) – VS Blower Component Identification drawing.)
The screw tube moves forward and rearward along the fixed feed tube.
The nozzle head is attached to the front end of the screw tube. A stuffing box is located at the
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rear (poppet valve) end of the screw tube. The stuffing box contains packing which als the
annular space between the screw and the feed tube to prevent the blowing medium from
escaping.
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MAINTENANCE MANUAL Document I.D.VS.A2.0.
The front portion of the stainless steel feed tube remains inside the screw spindle and its rear end is attached to the valve plate.
Attached to the screw tube flange is the poppet cam. At full forward travel, the poppet cam
engages a roller attached to the lever arm assy. The screw tube at this point may only rotate.
The rotation of the screw tube in turn rotates the lever arm assy. which opens the poppet valve.
At the end of the blowing cycle, the poppet cam releas the valve lever permitting the valve to clo. The motor direction is reverd and the screw tube is retracted from the boiler.
The poppet cam is designed for the specific blowing arc required at the installation. Should the blowing arc need to be changed, the cam can be replaced with little effort. Contact your Clyde
Bergemann for further information.
A2.4NOZZLE HEAD
(Reference: Section H1,(Illustrations) Project specific lance tube drawing.)
The VS blower’s nozzle head is made of heat and scale resisting steel.
The project specific lance tube assy. is normally provided with a nozzle head containing one
venturi nozzle. The jet produced blows at an incline to the wall heating surfaces. Between
blowing cycles, the nozzle head is retracted into the wall sleeve.
A2.5BLOWER VALVE
(Reference: Section H1, (Illustrations) BE-1151A-WC6-2 – Poppet Valve Assy.)
The blowing medium is fed to the feed and lance tube through a poppet valve, which has a
standard ANSI 600# R.F. flange. The flange on the poppet valve is connected to the blowing
medium supply piping. The valve stem is aled off by means of a pure graphite valve stem
packing. A matching t of cone, stem, at and packing is available for replacement and readily asmbled for installation.
The blower valve is opened by the rotating action of the screw tube. The poppet cam on the
screw tube flange engages a roller on the valve lever at the end of the forward travel. When the valve lever engages, this depress the valve stem and thus opens the poppet valve.
At the end of the blowing cycle, the poppet cam releas the valve lever permitting the valve to clo. The motor direction is reverd and the screw tube is retracted from the boiler.
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MAINTENANCE MANUAL Document I.D.VS.A2.0.
The pressure from the supply line can be independently adjusted with respect to the valve
opening via the pressure control disc. There are two threaded plug openings supplied as a
standard for monitoring of the blowing pressure downstream of the at and for connection of a vent valve and al air.
A2.6VENT VALVE
To prevent corrosive flue gas from penetrating the nozzle head, a vent valve is installed
laterally at the blower valve’s casing. It is opened between blowing cycles and permits
scavenging air to pass through the components in which a blowing medium flows. As soon as
the blower valve opens, the vent valve is clod by the pressure of the incoming blowing medium.
Under normal operating conditions, the pressure differential between the negative furnace
pressure and the surrounding atmosphere provides a sufficient flow of scavenging air through the vent valve. Then this flows through the nozzle head at the nozzle.
At soot blower locations where the boiler pressure is positive, the vent valve must be connected to an air supply with over pressure (4 – 6” wg) (100-150 mm), to prevent the flue gas
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penetrating the components in which the blowing agent flows.
A2.7WALLBOX
(Reference: Section H1 (Illustrations), Wallbox Detail
A2.7a Negative Pressure Installations
The wallbox als the entry point of the nozzle head through the boiler wall and rves to
attach the blower to the furnace. The blower is bolted to the front plate of the wallbox.
With permanent negative pressure on the flue gas side, the annular space between the
entry point at the boiler and the nozzle head, provides a sufficient flow of aling air into
the boiler.毛巾舞
An additional pipe union for impinging aling air is provided at the wallbox to protect
against short-term positive furnace pressure.
A2.7b Positive Pressure Installations
The wallbox is functionally the same as noted above. However for positive flue gas
pressures, aling air MUST be provided to the connection point noted. The aling air
should be supplied at a pressure 4-6” wg higher than maximum boiler pressure to prevent
the flue gas from entering the wallbox.
A branch from the aling air line can be connected to the vent valve to supply the scavenging air
required to purge flue gas from the lance tube.
19 October 2005Revision Number0恐婚怎么办
MAINTENANCE MANUAL Document I.D.VS.A2.0.
A2.8.DESIGN DATA
Drive Data
Motor.0.25 HP (208-230/460V, 3 Pha, 60 Hz, 1800 RPM) Travel250 mm (9 13/16”)
Speed1438 mm/min (17.25”/min)
Advancement per revolution127mm (5”)
Blowing Arc360 degrees
Dimensions & Material Data
a.Poppet Valve ASTM A217, Grade WC6
Plug Type 440 Stainless Steel
Seat Type 416 Stainless Steel
b.Feed Tube
Material304 Stainless Steel
高考热门专业Outer Diameter49 mm (1.96”)
Wall thickness 3 mm (.118”)
c.Screw Tube
Material ASTM A-819 1026
Outer Diameter68.2 mm (2.687”)
Inner Diameter51.4 mm (2.025”)
d.Nozzle Head
Material ASTM A447 Stainless Steel
Outer Diameter60.3 mm (2.375”)
Wall thickness 5.5 mm (.22”)
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裹浴巾
