Claims:We Claim:
1. An improved lifter and liner system for mixing and nodulizing drum at Sinter Plant to have increased residence time of mix inside Mixing and Nodulising Drum (MND)comprising

wear resistant segmented liner plates made of Ultra-High Molecular Weight Polyethylene (UHMWPE) embedded with ceramic chips installed above inner wall of MND; and
a plurality of rows of lifter bars made of wear resistant Cross Linked Polymer material embedded with ceramic chips, detachably fixed above said liner along the length of said drum with selective circumferential spacing; said lifter bars having selective height for desired increased retention time of sinter mix inside MND to achieve required homogeneity of sinter raw mix and optimum permeability on the sinter pallet.

2. An improved lifter and liner system for mixing and nodulizing drum at Sinter Plant as claimed in claim 1 wherein said lifter bars comprising slanting angle along material sliding side adapted to enhance cascading movement of materials.

3. An improved lifter and liner system for mixing and nodulizing drum at Sinter Plant as claimed in anyone of claims 1 or 2 wherein said liner shall be manufactured in a number of segments and is curved to fit on the inside drum curvature having top contour compatible to drum curvature.

4. An improved lifter and liner system for mixing and nodulizing drum at Sinter Plant as claimed in anyone of claims 1 to 3 wherein said liner comprises 6m span of inside of MND at the inlet lined with wear resistant Ultra High Molecular Weight Polyethylene) material of 30 mm thickness including 10 mm (min.) thick ceramic chips embedded on the inside curved surface of liner.

5. An improved lifter and liner system for mixing and nodulizing drum at Sinter Plant as claimed in anyone of claims 1 to 4 wherein said liner segments are detachably fixed above inner wall of MND with required stud, nut, washer, lock washer etc. with percentage of Ceramic Area on material contact face will be 75 % (minimum).

6. An improved lifter and liner system for mixing and nodulizing drum at Sinter Plant as claimed in anyone of claims 1 to 5 wherein shell Lifter Bars are fitted in 28 rows, each said lifter bar having a height of 70-80 mm, embedment with ceramic chips of 10 mm (min.) thickness said lifter also hold liner in the final position.

7. An improved lifter and liner system for mixing and nodulizing drum at Sinter Plant as claimed in anyone of claims 1 to 6 wherein increased height of lifter, helps increasing retention time of sinter raw mix inside MND, thereby increasing mixing efficiency and reducing standard deviation of chemistry of sinter mix.

8. A mixing and nodulizing drum of Sinter Plant adapted for increased residence time of mix having improved lifter and liner system as claimed in claims 1 to 7 installed therein, comprising
wear resistant segmented liner plates made of Ultra-High Molecular Weight Polyethylene (UHMWPE) embedded with ceramic chips installed above inner wall of MND; and
a plurality of rows of lifter bars made of wear resistant Cross Linked Polymer material embedded with ceramic chips, detachably fixed above said liner along the length of said drum with selective circumferential spacing; said lifter bars having selective height for desired increased retention time of sinter mix inside MND to achieve required homogeneity of sinter raw mix and optimum permeability on the sinter pallet.

9. A mixing and nodulizing drum of sinter plant as claimed in claim 8 wherein ceramic embedded lifter and liner reduces jamming problem inside MND wall and wherein life of liner and lifter embedded with ceramic chips will become double.

10. A mixing and nodulizing drum of sinter plant as claimed in anyone of claims 8 or 9 wherein said liner and lifter configuration is adapted to increases filling factor of MND and prevents falling of coarser particles due to increased retention time of sinter mix in MND.

Dated this the 28th day of March, 2018
Anan Sen
Of Anan Sen & Associates
(Applicants Agent)
IN/PA-199

, Description:FIELD OF THE INVENTION
The present invention relates to mixing and nodulizing drum(MND) of sinter plant with improved lifter and liner system. More particularly, the present invention is directed to provide a new type of wear resistant lifter and liner system made of Ultra-High Molecular Weight Polyethylene (UHMWPE) embedded with ceramic chips installed along with Lifter Bar of crossed linked Polymer Matrix with stud, nut washer, lock washer etc. in MND of Sinter Plant to achieve optimum permeability and homogeneity of sinter raw mix on the sinter pallet, moisture content of sinter raw mix, residence time of mix inside Mixing and Nodulising Drum (MND) and filling factor of MND should be optimum. To increase homogeneity of mix, residence time of sinter mix inside MND will be increased which also result in increased filling factor of MND, increased balling index, reduced jamming problem inside MND, thereby sinter productivity and quality can be improved significantly.

BACKGROUND OF THE INVENTION

Sinter machine performance is adjudged in terms of productivity and physico-metallurgical properties of sinter produced i.e. Tumbler Index (TI), Reduction degradation index (RDI), Reducibility index (RI), etc. The main factors that influence the sintering process are permeability of the mix, suction under the bed, height of the bed, amount and size of the fuel added, duration and temperature of ignition, method of charging etc. The productivity of sinter machine is directly proportional to vertical sintering speed (VSS), which in turn depends on the speed of air filtration through sinter bed. The speed of air filtration through the bed is dependent upon the permeability of the bed. Thus, permeability of the bed plays a very important role in determining the productivity of the sinter machine. To get the optimum permeability and homogeneity of sinter raw mix and sintering reaction on the sinter pallet, residence time of mix inside MND and filling factor of MND should be optimum.

The present invention thus is directed to provide a novel liner and lifter system of the mixing and nodulizing drum to achieve the desired optimum permeability and homogeneity of sinter raw mix and sintering reaction on the sinter pallet by increased residence time of mix inside MND and filling factor of MND.

OBJECTS OF THE INVENTION

The basic object of the present invention is directed to provide an improved liner and lifter system of mixing and nodulizing drum(MND) of sinter plant adapted to increase the homogeneity of mix, by increasing residence time of sinter mix inside MND which also result in increased filling factor of MND.

A further object of the present invention is directed to provide an improved liner and lifter system of mixing and nodulizing drum(MND) of sinter plant which will optimum permeability and homogeneity of sinter raw mix and sintering reaction on the sinter pallet and prevent falling of coarser particles, thereby improving the sinter productivity and quality.

A still further object of the present invention is directed to provide an improved liner and lifter system of mixing and nodulizing drum(MND) of sinter plant wherein life of liner and lifter embedded with ceramic chips will become double.

A still further object of the present invention is directed to provide an improved liner and lifter system of mixing and nodulizing drum(MND) of sinter plant wherein retention time inside MND increases with increased height of lifter installed inside the drum.

Another object of the present invention is directed to provide an improved liner and lifter system of mixing and nodulizing drum(MND) of sinter plant wherein mixing efficiency will increase and standard deviation of chemistry of sinter mix will reduce due to increased retention time.

Yet another object of the present invention is directed to provide an improved liner and lifter system of mixing and nodulizing drum(MND) of sinter plant wherein ceramic embedded lifter and liner will reduce jamming problem inside MND wall.

SUMMARY OF THE INVENTION

The basic aspect of the present invention is directed to an improved lifter and liner system for mixing and nodulizing drum at Sinter Plant to have increased residence time of mix inside Mixing and Nodulising Drum (MND)comprising

wear resistant segmented liner plates made of Ultra-High Molecular Weight Polyethylene (UHMWPE) embedded with ceramic chips installed above inner wall of MND; and
a plurality of rows of lifter bars made of wear resistant Cross Linked Polymer material embedded with ceramic chips, detachably fixed above said liner along the length of said drum with selective circumferential spacing; said lifter bars having selective height for desired increased retention time of sinter mix inside MND to achieve required homogeneity of sinter raw mix and optimum permeability on the sinter pallet.

A further aspect of the present invention is directed to an improved lifter and liner system for mixing and nodulizing drum at Sinter Plant wherein said lifter bars comprising slanting angle along material sliding side adapted to enhance cascading movement of materials.

A still further aspect of the present invention is directed to said improved lifter and liner system for mixing and nodulizing drum at Sinter Plant wherein said liner shall be manufactured in a number of segments and is curved to fit on the inside drum curvature having top contour compatible to drum curvature.

A still further aspect of the present invention is directed to said improved lifter and liner system for mixing and nodulizing drum at Sinter Plant wherein said liner comprises 6m span of inside of MND at the inlet lined with wear resistant Ultra High Molecular Weight Polyethylene) material of 30 mm thickness including 10 mm (min.) thick ceramic chips embedded on the inside curved surface of liner.

A still further aspect of the present invention is directed to said improved lifter and liner system for mixing and nodulizing drum at Sinter Plant wherein said liner segments are detachably fixed above inner wall of MND with required stud, nut, washer, lock washer etc. with percentage of Ceramic Area on material contact face will be 75 % (minimum).

Another aspect of the present invention is directed to said improved lifter and liner system for mixing and nodulizing drum at Sinter Plant wherein shell Lifter Bars are fitted in 28 rows, each said lifter bar having a height of 70-80 mm, embedment with ceramic chips of 10 mm (min.) thickness said lifter also hold liner in the final position.

Yet another aspect of the present invention is directed to said improved lifter and liner system for mixing and nodulizing drum at Sinter Plant wherein increased height of lifter, helps increasing retention time of sinter raw mix inside MND, thereby increasing mixing efficiency and reducing standard deviation of chemistry of sinter mix .

A still further aspect of the present invention is directed to a mixing and nodulizing drum of Sinter Plant adapted for increased residence time of mix having improved lifter and liner system as stated above installed therein, comprising
wear resistant segmented liner plates made of Ultra-High Molecular Weight Polyethylene (UHMWPE) embedded with ceramic chips installed above inner wall of MND; and
a plurality of rows of lifter bars made of wear resistant Cross Linked Polymer material embedded with ceramic chips, detachably fixed above said liner along the length of said drum with selective circumferential spacing; said lifter bars having selective height for desired increased retention time of sinter mix inside MND to achieve required homogeneity of sinter raw mix and optimum permeability on the sinter pallet.

A still further aspect of the present invention is directed to said mixing and nodulizing drum of sinter plant wherein ceramic embedded lifter and liner reduces jamming problem inside MND wall and wherein life of liner and lifter embedded with ceramic chips will become double.

A still further aspect of the present invention is directed to said mixing and nodulizing drum of Sinter Plant wherein said liner and lifter configuration is adapted to increases filling factor of MND and prevents falling of coarser particles due to increased retention time of sinter mix in MND.

The above and other objects and advantages are described hereunder in greater details with reference to following accompanying non limiting illustrative drawings.

BRIEF DESCRIPTION OF THE ACCOMPNAYING DRAWINGS

Figure 1: shows the schematic view of the mixing and nodulizing drum(MND) of sinter plant with wear resistance liner plate and lifter bar installed on the inside wall of the drum according to present invention for increased residence time and homogeneous mixing of sinter mix to improve permeability of sinter bed.

Figure 2: shows the schematic view of the details of liner plate and lifter bar to be installed inside the MND.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO ACCOMPANYING DRAWINGS

The present invention is directed to provide an improved liner and lifter system of mixing and nodulizing drum(MND) of sinter plant adapted to increase the homogeneity of mix, by increasing residence time of sinter mix inside MND which also result in increased filling factor of MND.

The new type of wear resistant liner made of Ultra-High Molecular Weight Polyethylene (UHMWPE) embedded with ceramic chips are installed along with Lifter Bar of crossed linked Polymer Matrix with stud, nut washer, lock washer etc. in MND of Sinter Plant-II. Detail dimension and material have been shown in the schematic drawing as per the accompanying Figures 1 & 2. Figure 1 shows the disposition of liner plate and the lifter bar along the inside wall of the mixing and nodulizing drum and Figure 2 shows the details of these items and the fixing arrangement. Inner curved surface of mixing and Nodulizing drum can be fitted with this liner and lifter system. Following are the details of the items used in the system:

Liner:

1. The 6 m span of inside of MND at the inlet is to be lined with wear resistant UHMWPE (Ultra High Molecular Weight Polyethylene) material of 30 mm thickness including 10 mm (min.) thick ceramic chips embedded on the inside curved surface of liner.
2. The liner shall be manufactured in a number of segments. The liner shall be curved to fit on the inside drum curvature having top contour compatible to drum curvature and as per system requirement. The liners are to be fixed above inner wall of MND with required stud, nut, washer, lock washer etc. Percentage of Ceramic Area on material contact face will be 75 % (minimum).

Lifter bar :

The Shell Lifter Bar shall be fitted in 28 rows. Lifter barares made of wear resistant Cross Linked Polymer material. Total height of lifter bar will be 70-80 mm. Embedment with ceramic chips will be of 10 mm (min.) thickness. This lifter will also hold liner in the final position.

Applicant’s Sinter plants have 16 nos. of sinter machine with drum mixer/ nodulizer. This innovation are implemented at one of the MND of sinter plants whereby sinter productivity and quality are improved significantly.

This innovative wear resistant lifter & liner made of Ultra-High Molecular Weight Polyethylene (UHMWPE) embedded with ceramic chips are installed along with Lifter Bar of crossed linked Polymer Matrix with stud, nut washer, lock washer etc. in MND of Sinter Plants of the applicant whereby following operational advantages are achieved:

i. Life of liner and lifter embedded with ceramic chips will become double.
ii. With increased height of lifter, retention time inside MND increases.
iii. With increased retention time, mixing efficiency will increase and standard deviation of chemistry of sinter mix will reduce.
iv. Slanting angle of lifter bar along material sliding side will enhance cascading movement of materials.
v. Balling index will increase.
vi. Ceramic embedded lifter liner will reduce jamming problem inside MND wall.