Sorbent containing engineered fuel feed stock
View Patent ↗Disclosed are novel engineered fuel feed stocks, feed stocks produced by the described processes, methods of making the fuel feed stocks, methods of producing energy from the fuel feed stocks. Components derived from processed MSW waste streams can be used to make such feed stocks which are substantially free of glass, metals, grit and noncombustibles and contain a sorbent. These feed stocks are useful for a variety of purposes including as gasification and combustion fuels. In addition, one or more sorbents can be added to the feed stocks in order to reduce the amount of a variety of pollutants present in traditional fuel and feed stocks, including, but not limited, sulfur and chlorine. Further, these feed stocks with added sorbent can mitigate corrosion, improve fuel conversion, extend power generating plant lifetime, reduce ash slagging, and reduced operating temperature.
1. A method of producing an engineered fuel feed stock from a processed MSW waste stream, the method comprising:
a) selecting a plurality of components from the processed MSW waste stream which components in combination have chemical molecular characteristics comprising
a carbon content of between about 30 wt % and about 80 wt %, and
a hydrogen content of between about 3 wt % and about 10 wt %,
wherein the selected MSW components contain biodegradable and non-biodegradable materials and substantially no glass, metals, grit, and noncombustible waste;
b) combining the selected MSW components of step a) form a feed stock; and
c) comparing the resulting chemical molecular characteristics of the selected MSW components of step b) with the chemical molecular characteristics of step a); and
d) adding a sorbent to form the engineered fuel feed stock.
2. The method of claim 1 further comprising:
e) optionally adding components to the selected MSW components of step b) if the chemical molecular characteristics of the selected MSW components in step b) do not fall within the chemical molecular characteristics of step a).
3. The method of claim 1 , wherein the engineered fuel feed stock has a moisture content of less than about 30%.
4. The method of claim 1 , wherein the engineered fuel feed stock has a sulfur content of less than about 0.5 wt %.
5. The method of claim 1 , wherein the engineered fuel feed stock has a chlorine content of less than about 1 wt %.
6. The method of claim 1 , wherein the engineered fuel feed stock has a HHV of between about 5,000 BTU/lb and about 15,000 BTU/lb.
7. The method of claim 1 , wherein the engineered fuel feed stock has a volatile matter content of about 40 wt % to about 80 wt %.
8. The method of claim 1 , wherein the engineered fuel feed stock is comminuted.
9. The method of claim 1 , wherein the engineered fuel feed stock is densified in the form of a pellet.
10. The method of claim 1 , wherein the engineered fuel feed stock has a ratio of H/C from about 0.09 to about 0.14.
11. The method of claim 1 , wherein the engineered fuel feed stock has an oxygen content, and a ratio of 0/C from about 0.3 to about 0.6.
12. The method of claim 1 , wherein the sorbent is selected from the group consisting of sodium sesquicarbonate (Trona), sodium bicarbonate, sodium carbonate, zinc ferrite, zinc copper ferrite, zinc titanate, copper ferrite aluminate, copper aluminate, copper manganese oxide, nickel supported on alumina, zinc oxide, iron oxide, copper, copper (I) oxide, copper (II) oxide, limestone, lime, Fe, FeO, Fe 2 O 3 , Fe 3 O 4 , iron filings, CaCO 3 , Ca(OH) 2 , CaCO 3 .MgO, silica, alumina, china clay, kaolinite, bauxite, emathlite, attapulgite, coal ash, egg shells, and Ca-montmorillonite.
13. A method of producing an engineered fuel feed stock, the method comprising:
a) receiving a plurality of MSW waste streams;
b) selecting a plurality of components from the plurality of MSW waste streams which components in combination have chemical molecular characteristics comprising
a carbon content of between about 30 wt % and about 80 wt %, and
a hydrogen content of between about 3 wt % and about 10 wt %,
wherein the selected MSW components contain biodegradable and non-biodegradable materials and contains substantially no glass, metals, grit, and noncombustible waste;
c) inventorying the selected MSW components based on the chemical molecular characteristics of the components;
d) comparing the chemical molecular characteristics of the inventoried components of step c) with the chemical molecular characteristics of step b); and
e) optionally adding components to the inventoried components of step c) to meet the chemical molecular characteristics of step b); and
f) adding a sorbent to form the engineered fuel feed stock.
14. The method of claim 13 , wherein the engineered fuel feed stock has a HHV of between about 5,000 BTU/lb and about 15,000 BTU/lb.
15. The method of claim 13 , wherein the engineered fuel feed stock has a volatile matter content of about 40 wt % to about 80 wt %.
16. The method of claim 13 , wherein the sorbent is selected from the group consisting of sodium sesquicarbonate (Trona), sodium bicarbonate, sodium carbonate, zinc ferrite, zinc copper ferrite, zinc titanate, copper ferrite aluminate, copper aluminate, copper manganese oxide, nickel supported on alumina, zinc oxide, iron oxide, copper, copper (I) oxide, copper (II) oxide, limestone, lime, Fe, FeO, Fe 2 O 3 , Fe 3 O 4 , iron filings, CaCO 3 , Ca(OH) 2 , CaCO 3 .MgO, silica, alumina, china clay, kaolinite, bauxite, emathlite, attapulgite, coal ash, egg shells, and Ca-montmorillonite.
17. The method of claim 13 , wherein the engineered fuel feed stock has an ash content of less than about 10%.
18. The method of claim 1 , wherein the engineered fuel feed stock has an ash content of less than about 10%.