The present invention relates to a ceramic lined Bowl Mill and, more particularly, Separator body lined along its interior with ceramic tiles through which mixture of pulverised coal & air passes after raw coal got ground in bowl & rollers. The ceramic-lined Separator body can be used wherever pulverised coal under pressure must be transported.
BACKGROUND OF THE INVENTION
The Separator body is a hollow cylindrical body placed above the Bowl Mill through which the mixture of pulverised coal and air passes and further proceeds towards Boiler via ceramic lined MPO, MDV, MOE, Bends & Pipes. The operating temperature at this place is about 120 to 140 deg.C. Presently mild steel/Nihard liners are being used in this area. In some area the erosion is so severe that the replacing/repairing of these mild steel/Nihard liners being done once in a year.
Abrasion resistance ceramic lining are being used presently in pulverized fuel lines such as line Bends, Straight Pipes, elbows, orifices, Bowl Mill components, Tube Mill components etc.
Separator body for the transport of high velocity mixture of pulverised coal & air generally are constituted of a mild steel material which must be protected from the pulverised coal transported through the Separator body against erosion. This is especially the case in thermal power station applications where failure of the mild steel member of the body may be detrimental to the environment, to operating personnel and to the equipment of the plant.
This is particularly the case when the pulverised coal is under pressure and the passage of the pulverised coal through the separator body places the latter under substantial pressure & velocity.

In general, the separator body used heretofore for such purposes are formed
externally with mild steel material and ceramic tiles, the later being especially useful
for mild steel separator body.
Mild steel separator body with Nihard liner have hitherto encountered following basic
problems.
The separator body experiences sever erosion due to higher pressure and Velocity of
the pulverised coal.
The Problem is more in upper portion of separator body. This requires the novel
design of fixing abrasion resistance ceramic tiles.
Due to erosion, mild steel separator body use to get punctured and needs repair or
replacement once in year or even less.
To solve this above recurring problem and to enhance the life of the separator body, a novel method of splicing the abrasion resistant ceramic lining for these critical areas is disclosed. Since it is desired that the ceramic lining create a significant abrasion resistance between its internal surfaces surrounded by the metallic body to form in the ceramic-material.
CERAMIC COMPONENT CONTAINING INCLUSIONS
3260/CHENP/2005 A (3260/CHENP/2005)
Filed on 2005-12-05
Publication date 2007-06-08
A ceramic component is disclosed, including a sintered ceramic body formed from a composition comprising a first ceramic material, and a plurality of inclusions in the ceramic body, each inclusion comprising graphite and a second ceramic material.

A METHOD OF FORMING A CERAMIC LINING ON THE INSIDE SURFACE OF A HOLLOW AXISYMMETRIC CONE
993/DEL/2007 A (993/DEL/2007)
Filed on 2007-05-08
Publication date 2008-11-21
The present invention discloses a method of forming a ceramic lining of uniform thickness on the inward surface of a hollow ax symmetric cone, such as on the inside surface of a hollow truncated right circular cone. The method of the present invention provides a ceramic lining on the inside surface of a hollow truncated right circular cone by simultaneous biaxial rotation of the hollow truncated right circular cone and carrying out a hermit reaction inside such a cone while it is rotating. This is accomplished by carrying out a highly exothermic reaction, capable of self-propagation after ignition and releasing sufficient heat to result in molten product or products, such as an exothermic hermit reaction, inside a hollow ax symmetric cone, such as on the inside surface of a hollow truncated right circular cone subjected to biaxial rotation.
WEAR-RESISTANT LINING
103/CHENP/2008 A (103/CHENP/2008)
Filed on 2008-01-07
Publication date 2008-09-19
A wear-resistant lining element (1) for a surface subjected to wear has an outwardly directed surface (4) over which material in the form of pieces or particles, such as crushed ore and crushed rock material, is intended to move. The wear-resistant lining element also has a thickness (d). The wear-resistant lining element (1) comprises elastomeric material (2) mainly adapted to absorb impact energy and

wear-resistant members (3) mainly adapted to resist wear. The wear-resistant members (3) are in a plane (P) perpendicular to the outwardly directed surface (4) designed so that in the direction of thickness (d) they at least partially overlap each other. Moreover, a wear-resistant lining made of a number of wear-resistant lining elements (1) is disclosed. Elected for publication.
European:
Application number: CN20092300906U 20090226
Priority number(s): CN20092300906U 20090226
View INPADOC patent family View list of citing documents
CN 201368320 (Y)
An abrasion-proof lining board comprises a metal basal body and a plurality of ceramic blocks, wherein the ceramic blocks are inlaid in inlaying holes of the metal basal body, and adhesive is filled between the ceramic block and the metal basal body. Compared with the prior art, since the ceramic blocks are inlaid in the metal basal body and adhesive is filled between the ceramic blocks, the abrasion-proof lining board not only has strong abrasive resistance of ceramics, but also has strong impact resistance of metal, is suitable for industries of electric power, metallurgy, mines, docks, building material, chemical industry and the like, and is suitable for applying on the inner surfaces of pipelines, chutes, charging spouts and the like for conveying particles and powder materials.

European: C22C29/04; C22C29/12; C22C29/14; C22C29/16
Application number: KR20097001892 20090129 Priority number(s): US20060479680 20060630
KR 20090026201 (A)
The present invention is directed to a method for protecting metal surfaces in oil & gas exploration and production, refinery and petrochemical process applications subject to solid particulate erosion at temperatures of up to 100O0C. The method includes the step of providing the metal surfaces in such applications with a hot erosion resistant cermet lining or insert, wherein the cermet lining or insert includes a) about 30 to about 95 vol% of a ceramic phase, and b) a metal binder phase, wherein the cermet lining or insert has a HEAT erosion resistance index of at least 5.0 and a KjC fracture toughness of at least 7.0 MPa-m1/2. The metal surfaces may also be provided with a hot erosion resistant cermet coating having a HEAT erosion resistance index of at least 5.0. Advantages provided by the method include,inter alia, outstanding high temperature erosion and corrosion resistance in combination with outstanding fracture toughness, as well as outstanding thermal expansion compatibility to the base metal of process units. The method finds particular application for protecting process vessels, transfer lines and process piping, heat exchangers, cyclones, slide valve gates and guides, feed nozzles, aeration nozzles, thermo wells, valve bodies, internal risers, deflection shields, sand screen, and oil sand mining equipment.


CN 201296482 (Y)
The utility model relates to a boxlike impact and abrasion resistant ceramic lining plate. The boxlike impact and abrasion resistant ceramic lining plate is characterized in that abrasion resistant ceramic sheets (1) are evenly arranged in a sheet steel box (2); vulcanized rubber layers used for conglutinating and buffering the abrasion resistant ceramic sheets (1) and the sheet steel box (2) are arranged between the abrasion resistant ceramic sheets (1) and the sheet steel box (2); bolts (4) are arranged below the sheet steel box (2); and the other ends of the bolts (4) are arranged in material conveying equipment and at a position prone to impact from material. The boxlike impact and abrasion resistant ceramic lining plate can be arranged in the material conveying equipment to resist the impact and the abrasion from big material; the vulcanized rubber layers arranged between the sheet steel box and the abrasion resistant ceramic sheets (1) effectively buffers the strong impact acting on ceramic surfaces of the ceramic lining plate; the bolts arranged below the sheet steel box can be conveniently replaced by workers, thereby the labor intensity of the workers are reduces and the labor productivity of the workers are improved; and the utility model has the advantages of simple structure, convenient manufacturing, reliable performance and the like.

CN 201277410 (Y)
The utility model provides a ceramic lining compensator, which is used in pipeline delivery systems in the industries such as mines, coal, metallurgy, building materials, chemical industry, environment protection and the like. The ceramic lining compensator is also named as an expansion joint or a telescopic joint. The

ceramic lining compensator comprises a connecting tube and a honeycomb duct, wherein one end of the honeycomb duct (an initial end of medium flow) is connected with the connecting pipe (or other connection modes), the other end of the honeycomb duct forms a free state (or flexible connection), the inner wall of honeycomb duct is provided with a protective layer which is made of ceramic, and the ceramic which forms the protective layer is an abrasion-proof ceramic plate, an abrasion-proof ceramic tube or a self-propagating ceramic layer. The ceramic lining compensator solves the defects in a compensator of the prior art that the honeycomb duct is made of metal and is easily abraded under the effect of two phase media of high speed flowing air-solid (or liquid-solid), thereby becoming invalid. Compared with the prior art, the ceramic lining compensator has simple structure, materials of the working surface of over-current media are changed from metal into plastic, the abrasive resistance and the high-temperature resistant performance of the honeycomb duct are intensified, thereby greatly improving the service life of the compensator.
CN 201225460 (Y)
The utility model discloses a wearable pipeline with a ceramic liner, which comprises an inner pipe and an outer metal pipe tightly sleeved on the inner pipe. The inner pipe is an all-ceramic pipe, a filling layer is arranged between the inner pipe and the outer pipe, and the filling layer is formed by filling high-intensity temperature-resistant glue and part of heat-insulating materials between the inner pipe and the outer pipe. Because the all-ceramic pipe is adopted as the inner pipe, and the all-ceramic pipe is seamless, the corrosion resistance is significantly improved. The utility model has the advantages of excellent comprehensive performance, wear resistance, corrosion resistance, high-temperature resistance, high hardness and strength, no material sticking, no material blocking and good insulating property inside the pipeline.

US patent
Application Number: 08/524246 Publication Date: 02/25/1997 Filing Date: 09/06/1995
In accordance with the present invention there is provided an improved classifier system for a pulverizer mill (e.g., a mill of the type used for crushing coal into fine particles). The improved classifier system includes a cylindrical extension member (sometimes referred to herein as a Finned Cyclone Classifier Section) which is secured to and extends vertically upwardly from the upper end of the conical classifier. The Finned Cyclone Classifier Section (cylindrical extension member) includes an interior surface which includes a plurality of projections extending radially inward.
In preferred embodiments the improved classifier system also includes an intermediate classification liner attached circumferentially to the interior surface of the mill housing high above the grinding elements (or grinding zone). The intermediate classification liner provides a converging-diverging orifice assembly which extends around the interior surface of the housing between the grinding zone and the classifier. This intermediate classification liner redirects the upwardly moving and turbulent Primary Air Flow towards the center of the pulverizer. This redirection of the Primary Air Flow will result in a large loss of upward momentum in the bigger partly ground coal particles, allowing them to fall back into the grinding zone without passing through the classifier. This new method of particle of separation is referred to herein as Intermediate Classification.
The above drawbacks are eliminated by this present invention by novel method of splicing the abrasion resistant ceramic linings as described below.

OBJECTS OF THE INVENTION
It is the principal object of the invention to provide a ceramic lined separator body in
which the afore described disadvantages are avoided and which can be used for the
transport or passage of high velocity pulverised coal at high pressures.
Another object of the invention is to provide a separator body for the purposes
described which is of relatively simple and inexpensive construction and is capable of
withstanding high velocity pulverised coal at high pressures.
A further object of the invention is to provide a ceramic lined separator body which is
free from the disadvantages of earlier separator body using mild steel with Nihard
liner and which precludes localized erosion and abrasion of the Nihard liners.
A further object of the invention is to provide a method of splicing the abrasion
resistant ceramic lining in such a way that Nihard liner, higher erosion in critical areas
is avoided.
These objects which will become apparent from the following description.
SUMMARY OF THE INVENTION
In accordance with the present invention, with a ceramic lined separator body comprising outer mild steel and an inner flat ceramic tile constituting a lining for the passage formed internally of the separator body. According to the invention, this ceramic lining is internally spliced by tiles with silicone sealant adhesive, which is adapted to withstand the wear and erosion due to high velocity flow of pulverised coal in the separator body.
The invention relates to a novel method of splicing the abrasion resistant ceramic lining by fixing weld-on tiles on inner surface of separator body and inter locking of ceramic tiles together. The splicing a plurality of abrasion resistant ceramic tiles is

done in such a way that thickness of the abrasion resistance ceramic is increased on the surface where underlining Ni-hard liner experience higher erosion. The abrasion resistant ceramic lining of separator body of the invention provides the advantages of reducing erosion of Ni-hard liner, low cost, and longer life of the separator body which reduces the shutdown time and maintenance cost.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
The above and other objects, features and advantages of the present invention will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
Fig.1 Schematic diagram showing the Ceramic lined separator body of Bowl Mill used for pulverising raw coal in Thermal Power Stations.
1. Ceramic tiles spliced on the inner surface of the separator body of Bowl Mill.
2. Mild steel casing forms the outer part of separator body of Bowl Mill.
3. Silicone sealant adhesive for pasting of ceramic tiles.
DETAIL DESCRIPTION OF THE INVENTION
The invention relates to a separator device in which splicing the abrasion resistant ceramic lining are fixing with weld-on tiles on the inner surface of the mild steel separator body of Bowl Mill. The plurality of abrasion resistant ceramic tiles (1) of varying thickness is spliced on the surface of the mild steel separator body (2). High abrasion resistant ceramic tiles of uniform thickness and suitable sizes are manufactured from High Alumina (85-90 %).

The splicing a plurality of abrasion resistant ceramic tiles is done in such a way that uniform thickness of the abrasion resistance ceramic is maintained on the surface where mild steel body lined with Nihard liners experience higher erosion. This is achieved by using Weld-on tiles fixed using silicone sealant (3) and then welded by mild steel plug.
The ceramic lining was spliced using silicone sealant as adhesive which will
withstand a temperature of 160 deg.C. This critical parameter of thickness was
decided considering the design factor of area of opening through which pulverized
coal passes.
As can be seen from Fig.1, in separator body high-velocity and high-pressure pulverised coal exits from separator body through MPO, MDV, MOE, line bends etc. towards Boiler. The pulverised coal passes through mild steel separator body (2) as shown in the drawing by way of example is formed from a plurality of tiles (1) to provide ceramic lining with weld-on tiles which are axially interfitted using silicone sealant adhesive. After sufficient curing mild steel plugs are placed in the holes provided in the tiles for the purpose and then welded to mild steel body to provide ceramic lining.
The design of lining is so determined that the ceramic lining is not subjected to significant forces along its outer periphery or high velocity pulverised coal which may develop are counterbalanced or rendered of insignificant effect so that they do not tend to damage or erosion on the steel body.
Upon the passage of a high velocity pulverised coal through the separator body, this pulverised coal yields or expands outwardly so that it is pressed with greater force to the wall of separator body. The parasitic pulverised coal flows in the inner surface of separator body are minimized by the seals of the axial sections of the ceramic lining to the inner wall while erosion of steel body is minimized by the presence of the surrounding element for each of the ceramic lining sections. As a result, the wear resistance effectiveness of the separator body is increased.

According to a further feature of the invention, the ceramic tiles which may be composed of alumina enable the separator body to be constituted of a plurality of
inter-fitted ceramic tiles without the danger that such parasitic pulverised coal can form or be detrimental. In regions in which the axial lengths of the ceramic tiles are spliced to the surrounding steel body. The tiles can be sealed hermetically to this separator body. For example by welding.
Fig.1 shows the detail of ceramic lining done on separator body weld-on tiles pasted using silicone sealant adhesive and welded to the steel body using mild steel plugs through holes provided fat the centre of ceramic tiles. This facilitates the inter locking of tiles to withstand the pressure of pulverised coal. As a result, the wear resistance effectiveness of the steel plates is increased.

WE CLAIM
1. A separator device for transporting a high velocity pulverised coal that is mixture of pulverised coal and air restricting the erosion of said device, comprising:-a mild steel circular body;
a ceramic tiles spliced inside mild steel circular body defining a passage within said body for passing of said mixture; and
a plurality of annular ceramic tiles splicing circumferentially fixed around the body for resisting the of erosion by said mixture to said body.
2. The separator device as claimed in claim 1, wherein the splicing a plurality of abrasion resistant ceramic tiles is done in such a way that thickness of the abrasion resistance ceramic is varied in the range of 5 mm to 50 mm in the areas where underlining metal plates experience higher erosion.
3 . The separator device as claimed in claim 1, wherein the ceramic lining is fixed with weld on tiles by using silicon sealant adhesive.
4. The separator device as claimed in claim 3, wherein the pasted weld-on tiles are welded to the mild steel plugs through holes provided at the centre of ceramic tiles.