Two stage gasifier for generating syngas

1. A method for producing syngas comprising:

a first stage gasification process for gasifying a first feedstock at a temperature in the range of 500° C. to 700° C. to produce a first gaseous product comprising tar, syngas and a solid waste comprising ash;

prolyzing a second feed stock to produce a second gaseous product comprising pyrolyzer oil;

combining the first gaseous product with the second gaseous product to obtain a first product;

a second stage gasification process for gasifying the first product to produce syngas; and

controlling operating temperature during the second stage gasification process for regulating composition of the syngas.

2. The method as claimed in claim 1 , wherein the method further comprises removing a solid waste comprising ash from the first stage gasification process at the temperature range of about 500° C. to 700° C. to reduce concentration of contaminants within the first product.

3. The method of claim 1 , wherein the pyrolyzing of a second group of feed stock is performed in a pyrolyzer to produce the gaseous product comprising pyrolyzer oil.

4. The method of claims 1 , wherein the second stage gasification is performed in a second stage gasifier configured to receive the first product and to gasify the first product to produce syngas.

5. The method of claim 1 , wherein the first stage gasification is performed in

a first stage gasifier configured to gasify a first group of feedstocks having a predefined ash content.

6. The method as claimed in claim 1 , wherein the second stage gasifier is a high temperature gasifier configured to receive at least one feedstock from a group consisting of a third group of feedstocks and a fourth group of feedstocks and to gasify the feedstock along with the first product to produce syngas.

7. The method as claimed in claim 1 , wherein the method further comprises introducing at least one feedstock selected from a group consisting of a third group of feedstocks and a fourth group of feedstocks in the second stage gasification process.

8. The method as claimed in claim 7 , wherein the feedstock from the third group of feedstocks is selected from the group consisting of Pet-coke, Char, heavy oil, Bitumen, and solvent deasphalted pitch.

9. The method as claimed in claim 7 , wherein the feedstock from the fourth group of feedstocks is a biomass derived feedstock consisting of Black liquor and Pyrolysis oil along with Shale oil.

10. The method as claimed in claim 7 , wherein the method further comprises segregating input feedstocks into a first group of feedstocks, a second group of feedstocks, the third group of feedstocks and the fourth group of feedstocks based on reactivity and ash content.

11. The method as claimed in claim 1 , wherein the method further comprises segregating input feedstocks into a first group of feedstocks and a second group of feedstocks based on reactivity and ash content.

12. The method as claimed in claim 11 , wherein the first stage gasification process operates at a low temperature range of about 500° C. to 700° C.

13. The method as claimed in claim 11 , wherein the second stage gasification process operates at a high temperature range of about of 1400° C. to 1500° C.

14. The method as claimed in claim 11 , wherein at least one feedstock from the first group of feedstocks is selected from the group consisting of coal having 0-50% of ash by weight.

15. The method as claimed in claim 11 , wherein the at least one feedstock from the second group of feedstocks is selected from the group consisting of biomass and plastic waste.

16. The method as claimed in claim 1 , wherein controlling the operating temperature during the second stage gasification process comprises controllably supplying plasma energy to maintain a temperature range of about 1400° C. to 1500° C.

17. The method as claimed in claim 16 , wherein controllably supplying plasma energy comprises controlling operation of the plasma source separately linked to the second stage gasifier.