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In a typical recovery boiler there is one or more smelt spouts, and for example in large recovery boilers there may be over ten smelt spouts. The cleaning unit moves to the location of the smelt
A spout for a recovery boiler such as those used in the papermaking industry. As in prior art spouts of this type, the spout is provided with an internal cavity to thereby permit water cooling of the spout. By this invention, a duct is provided for the internal cavity, the
The purpose of the Smelt Spout is to transport char bed deposits from the furnace to the dissolving tank. By using our smelt spout, you will get an efficient, stable and controlled smelt flow, reducing noise and hazardous smelt risks. Our smelt spout can be utilized on any recovery boiler, and it is suitable for your local boiler condition.
(PDF) Understanding recovery boiler smelt runoff phenomena
Recovery boiler - Wikipedia Recovery boiler is the part of Kraft process of pulping where chemicals for white liquor are Recovery boilers also improved the smelt removal. It is removed directly from the furnace through smelt spouts into a dissolving tank. Some of the
Large Hood Systems 6 8/23/2016 Working Towards a Safer Recovery Boiler Operation -TAPPI PEERS Typical Challenges – Many internal components for Smelt to collect on Support bars, shower bars, etc… – Requires a lot of hood shower water – Shatter
In kraft recovery boiler operations, molten smelt (mainly consisting of sodium carbonate and sodium sulfide, and small amounts of sodium sulfate, sodium chloride, and potassium salts) flows out of the boiler at 800 C-850 C down a number of spouts, at a flow1 L
FIG. 1 shows a typical smelt spout area of a recovery boiler, which comprises smelt spouts 1, along which the smelt is directed from the furnace 2 to the dissolving tank 3. Typically, the smelt is very hot (for example 750 to 820 C.). The possible splashes of
The main autocausticizing reaction that occurs in the recovery boiler is between sodium metaborate and sodium carbonate in the molten smelt, which forms trisodium borate. The trisodium borate reacts with the water in the smelt-dissolving tank to form sodium hydroxide and regenerate sodium metaborate ( Björk et al., 2005 ).
Severe corrosion led to an in-service failure of one of the six spouts on a recovery boiler at Cenibra. The failure resulted in a large a mount of coolin g water entering t he boiler and contacting
27/2/2015 · Valmet Smelt Spout Cleaning Robotefficiently removes smelt deposits from recovery boiler smelt spouts in a carefully designed sequence. The spout rodder ensu
The smelt spout area of a recovery boiler is one of the least desirable and sometimes also a dangerous place to work. However, essential regular tasks need to be carried out for efficient and smooth operation of the boiler. Smelt can cause several issues in the spout
Recovery boiler explosions fall into four categories -- smelt water explosions, auxiliary fuel explosions, explosions from ignition of unburned gases from pyrolyzed black liquor, and dissolving tank explosions.
5/3/2021 · Improving Safety Around Recovery Boiler Operations. The recovery boiler is a vital part of the pulp mill but also a source of potential safety hazards for its operators. One of the purposes of the recovery boiler is to recover the pulping chemicals from the black liquor which is done in the form of smelt from the bottom of the furnace.
Smelt fluidity, the ability of smelt to flow out of recovery boiler spouts, is inversely related to smelt viscosity. Molten smelt has a viscosity value between 2.5 and 5 mPa*s, which is not
The molten smelt then flows out of the bottom of the recovery boiler through a number of smelt spouts to ensure sufficient drainage. The outflowing smelt stream is shattered into small droplets using one or more high pressure steam jets before falling into
Smelt spout corrosion in a recovery boiler JULIO CÉSAR TÔRRES RIBEIRO, MARCELO CARDOSO, and HONGHI TRAN PEER-REVIEWED CORROSION & MATERIALS ABSTRACT: Severe corrosion led to an in-service failure of one of the six spouts on a
What kind of environment do the spouts live in? 20 • Hot flowing smelt over the surface of the trough • Extreme variations in flow rate (from plugging to smelt rushes) • Insufficient cooling water flow • Boiling of cooling water under trough plate • Enclosed space