SRF, RDF fuel

SRF-fuel

TU U 38.1-39365144-002: 2019,

Statement of the State Consumer Service, No. 602-123-20-2 / 645 dated 16.01.2019

(These specifications are the design and property of NBTR LLC)

RDF-fuel

TU U 38.1-39365144-001: 2018,

Conclusion of the State Consumer Service, №602-123-20-2 / 44642 dated 29.10.2018

(These specifications are the design and property of NBTR LLC)

FUEL FROM MUNICIPAL SOLID WASTE

RDF production line includes:

  • Magnetic separators;
  • Non-magnetic detectors;
  • Primary crushers to the fraction of 100-400 mm. in size;
  • Secondary crushers to the fraction of 3-30 mm. in size;
  • Vibroscreens;
  • Dryers wyth cyclone-filters;

When the secondary raw material is fully separated in sorting cabins, magnetic separators, non-magnetic detectors, the residual of MSW is transported to primary and secondary crushers.  This residual includes:

  • Wood and its derivatives;                      
  • Leather, rubber articles;
  • Multilayer package;
  • Plastics;

and unseparated residual (the residual that can not be used as a secondary raw material) :

  • Paper, cardboard and other paper waste;
  • Textile;
  • Plastics;

The quantitive index of such residuals variates around 35% from total amount of MSW. In case the plant is fully orientated to energy production, all the combustible raw material (including secondary raw material) is transported for RDF production. In this case, the quantitive index of produced RDF may raise to 50% from total amount of MSW. Also, in this case, appears an opportunity for RDF composition manual regulation (artificially forced enrichment)  to achieve its homogeneity and maximum calorific value.  

An average calorific value of RDF is accepted between  4200-5200 kcal/kg6 which corresponds to the lowest combustion heat  16-20 МДж/кг. If the artificially forced enrichment system is used, a high index of RDF homogeneity and caloricity is achieved.  Herewith, the average combustion heat is taken at the level of 20 MJ/kg +/-2 МJ in all batches.

    Indicators of the individual possible RDF components are shown in the table

Component Qphi
 
МДж/кг
1 Bitumen 41,9
2 Paper 13,4
3 Textile 16,2
4 Wood 14,7
5 Chip-board 16,8
6 Cardboard 13,9
7 Linoleum, PVC base 20,3
8 Linoleum, PVC base 39,8
9  Transformer oil 43,1
10 Industrial oil 42,3
11 Motor oil 41,8
12 Plastic 33,6
13 PVC 17,3
14 Foamed polyurethane 24,3
15 Polyethylene 47,1
16 Resin 33,5
17 Polymeric petroleum resin 32,1
18 Polymeric synthetic fabric 31, 1
19 Plywood 18,2
20 Sawdust 18,6
21 Solid oil 37,2
22 Polymethylmethacrylate 27,8
23 Polyethylene terephthalate 20,8

Characteristics of some polymeric components of MSW

Component Composition, % Lower heating value, Qн kcal/kg
  с н о n cl  
Polyacrylamide 57,8 6,0 18,6 17,6 - 5680
Polyvinyl acetate 55,8 7,0 37,2 - - 5270
Polyvinyl chloride 38,7 4,9 - - 56,4 4340
Isopropane rubber 63,7 9,7 14,2 12,4 - 7180
Polypropylene 85,7 14,3 - - - 11150
Polystyrene 92,8 7,2 - - - 9280
Polyethylene 85,7 14,3 - - - 10460
Polyethylene terephthalate 62,5 4,2 33,3 - - 5220
Polyamides 38,9 5,9 8,6 7,6 - 7180

To obtain the optimal fuel composition a process chart of RDF composition is developed. Optical analyzers may be provided for installion after shredders and vibroscreens to fix the RDF composition and determine its caloric value in batches. The optical analyzer is installed after the secondary shredder and vibroscreens and it does a real-time analysis of the future RDF composition with data fixation for the following parameters:

  • Calorific value in MJ;
  • Humidity in %;
  • Material composition;
  • PVC content in %;

 

Data recorded by the optical analyzer is used as confirmation for RDF certificate.

After shredding and vibroscreening, the prepared raw RDF (pre-RDF) is moved to dryers with cyclone filters. When pre-RDF humidity reaches the level of 15-20% RDF it becomes a ready for combustion in boilers RDF.