Combustion and flue gas treatment system and SOx removal unit

Patent metadata

Field	Value
Publication number	US-9879857-B2
Application number	US-201514814908-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Aug 21, 2014
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

The combustion and flue gas treatment system includes a furnace for combusting a fuel with an oxidizer generating a flue gas, ducting for the flue gas connected to a NO x removal unit and a SO x removal unit, and a recirculation line for recirculating a part of the flue gas back to the furnace. The SO x removal unit is located upstream of the NO x removal unit with reference to the flue gas flow. The recirculation line is connected to the ducting downstream the SO x removal unit.

First claim

The invention claimed is:

1. A combustion and flue gas treatment system comprising a furnace for combusting a fuel with an oxidizer generating a flue gas, ducting for the flue gas connected to a NO x removal unit and a SO X removal unit, a recirculation line for recirculating a part of the flue gas back to the furnace, wherein the SO x removal unit is located upstream of the NO x removal unit with reference to the flue gas flow, and in that the recirculation line is connected to the ducting downstream the SO x removal unit, and wherein the combustion and flue gas treatment system comprises a dust removal unit, the dust removal unit located downstream of the SO x removal unit and upstream of the NO x removal unit.

2. The system of claim 1 , wherein the dust removal unit is located upstream of a recirculation line connection to the ducting.

3. The system of claim 1 , wherein the SO X removal unit comprises a vessel with an inlet for a flue gas and an outlet for a treated flue gas, and further comprising a pulverized reagent supply for a reagent.

4. The system of claim 3 , wherein the pulverized reagent supply comprises a manifold with a plurality of nozzles.

5. The system of claim 3 , wherein the pulverized reagent supply comprises a reagent reservoir and a carrier gas supply.

6. The system of claim 1 , wherein the SO X removal unit comprises a vessel with an inlet for a flue gas and an outlet for a treated flue gas, wherein the vessel houses a reagent bed, wherein the inlet and the outlet are located at opposite sides of the vessel with respect to the bed.

7. The system of claim 6 , wherein the inlet is at the lower part of the vessel and the outlet is at the upper part of the vessel.

8. The system of claim 1 , wherein the furnace is part of a boiler, wherein the system comprises an economizer for heating water supplied to the boiler and a heat exchanger for cooling the flue gas, wherein the SO x removal unit is located downstream of the economizer and upstream of the heat exchanger.

9. The SO X removal unit of claim 3 , wherein the reagent bed is a fluidized bed.

Assignees

• Alstom Technology Ltd
• General Electric Technology Gmbh

Inventors

• Stallmann Olaf
• Wang Wuyin
• Böös Erik W

Classifications

• B01D2257/302

  Sulfur oxides · CPC title

• B01D53/83

  with moving reactants · CPC title

• B01D53/508

  by treating the gases with solids · CPC title

• F23J2219/60

  Sorption with dry devices, e.g. beds · CPC title

• F23J2215/10

  Nitrogen; Compounds thereof · CPC title