Contemplated configurations and methods include a hydrogen pressure swing adsorption unit that receives a feed gas comprising a hydrogen production stream and a non-recycled hydrogen-containing waste stream.
1. A method of producing a hydrogen product, comprising:
providing a hydrogen production stream from a steam reformer and a non-recycled hydrogen-containing waste stream;
combining the hydrogen production stream and the non-recycled hydrogen-containing waste stream; and
separating hydrogen from the combined hydrogen production stream and the non-recycled hydrogen-containing waste stream in a pressure swing adsorption unit, and thereby forming a hydrogen product stream and a non-recycled tail gas.
2. The method of claim 1 wherein the hydrogen production stream is further subjected to a shift conversion before the step of combining.
3. The method of claim 1 wherein the non-recycled hydrogen-containing waste stream is provided by a waste stream selected from the group consisting of a fluid catalytic cracking offgas, a thermal cracking offgas, a hydrotreating offgas, and a catalytic reforming offgas.
4. The method of claim 1 wherein the non-recycled tail gas is combusted in the steam reformer.
5. A plant comprising:
a hydrogen pressure swing adsorption unit receiving a feed stream;
wherein the feed stream comprises a hydrogen production stream from a steam reformer and a non-recycled hydrogen-containing waste stream; and
wherein the hydrogen pressure swing adsorption unit produces a non-recycled tail gas and a high-purity hydrogen product.
6. The plant of claim 5 wherein the non-recycled hydrogen-containing waste stream is combined with the hydrogen production stream after the hydrogen production stream has been subjected to a shift conversion.
7. The plant of claim 5 wherein the non-recycled hydrogen-containing waste stream is selected from the group consisting of a fluid catalytic cracking offgas, a thermal cracking offgas, a hydrotreating offgas, and a catalytic reforming offgas.
8. The plant of claim 5 wherein at least part of the non-recycled tail gas is combusted in the steam reformer.
9. The plant of claim 5 further comprising an acid gas removal unit fluidly coupled to a methanator, and wherein the acid gas removal unit receives at least a portion of the hydrogen production stream.
10. The plant of claim 5 further comprising a booster that increases pressure of the non-recycled hydrogen-containing waste stream to a pressure of the hydrogen production stream.
11. A plant comprising a hydrogen pressure swing adsorption unit that receives a feed gas comprising a hydrogen production stream and a non-recycled hydrogen-containing waste stream.
12. The plant of claim 11 wherein the hydrogen production stream is provided by a steam reformer, and wherein the non-recycled hydrogen-containing waste stream is provided by a waste stream selected from the group consisting of a fluid catalytic cracking offgas, a thermal cracking offgas, a hydrotreating offgas, and a catalytic reforming offgas.
13. The plant of claim 11 wherein the non-recycled hydrogen-containing waste stream is combined with the hydrogen production stream after the hydrogen production stream has been subjected to a shift conversion.
14. The plant of claim 11 wherein the hydrogen pressure swing adsorption unit produces a non-recycled tail gas that is combusted in a steam reformer.