Spray drying system

Patent metadata

Field	Value
Publication number	US-10967327-B2
Application number	US-201716319939-A
Country	US
Kind code	B2
Filing date	Oct 11, 2017
Priority date	Nov 14, 2016
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A spray drying system for drying wastewater to be dried includes: an exhaust as introduction line for introducing the exhaust gas discharged from an exhaust gas generation source, the exhaust gas introduction line being connected to a plurality of exhaust gas ducts for allowing the exhaust gas to flow through; and at least one spray drying device connected to the exhaust gas introduction line and configured to bring the exhaust gas introduced from the exhaust gas introduction line into contact with the wastewater. The number of spray drying device is smaller than the number of the plurality of exhaust gas ducts.

First claim

The invention claimed is:

1. A spray drying system for drying wastewater to be dried, the spray drying system comprising:
an exhaust gas introduction line for introducing an exhaust gas discharged from an exhaust gas generation source, the exhaust gas introduction line being connected to a plurality of exhaust gas ducts for allowing the exhaust gas to flow through, the exhaust gas introduction line being configured to extract the exhaust gas from each of the plurality of exhaust gas ducts, the exhaust gas generation source being configured to generate the exhaust gas by combusting a fuel; and
at least one spray drying device connected to the exhaust gas introduction line and configured to bring the exhaust gas introduced from the exhaust gas introduction line into contact with the wastewater, wherein the number of spray drying devices is smaller than the number of the plurality of exhaust gas ducts; and
an exhaust gas discharge line connecting the spray drying device and each of the plurality of exhaust gas ducts,
wherein the exhaust gas discharge line includes:
a single upstream-side exhaust gas discharge line connected to the spray drying device;
a plurality of downstream-side exhaust gas discharge lines, wherein a downstream-side exhaust gas discharge line among the plurality of downstream-side exhaust gas discharge lines is connected to each of the plurality of exhaust gas ducts; and
a discharge-side branch part branched into each of the plurality of downstream-side exhaust gas discharge lines from the single upstream-side exhaust gas discharge line.

2. The spray drying system according to claim 1 ,
wherein a first dust collector configured to remove soot dust contained in the exhaust gas is disposed in each of the plurality of exhaust gas ducts, and
wherein each of the plurality of downstream-side exhaust gas discharge lines of the exhaust gas discharge line is connected to corresponding one of the plurality of exhaust gas ducts on an upstream side of the corresponding first dust collector.

3. The spray drying system according to claim 1 ,
further comprising a second dust collector disposed in the upstream-side exhaust gas discharge line of the exhaust gas discharge line and configured to remove soot dust contained in the exhaust gas.

4. The spray drying system according to claim 1 ,
wherein a connection position between the spray drying device and the upstream-side exhaust gas discharge line is positioned above a connection position between each of the respective downstream-side exhaust gas discharge lines and corresponding one of the plurality of exhaust gas ducts.

5. The spray drying system according to claim 4 ,
wherein the upstream-side exhaust gas discharge line is connected to a bottom part of the spray drying device,
wherein a position of the discharge-side branch part is positioned below the connection position between the spray drying device and the upstream-side exhaust gas discharge line, and above the connection position between each of the plurality of downstream-side exhaust gas discharge lines and corresponding one of the plurality of exhaust gas ducts, and
wherein the position of the discharge-side branch part is positioned in the middle of two exhaust gas ducts disposed outermost of the plurality of exhaust gas ducts.

6. The spray drying system according to claim 1 , further comprising a plurality of third flow-rate adjusting parts each of which is disposed in corresponding one of the plurality of downstream-side exhaust gas discharge lines, the third flow-rate adjusting part being capable of adjusting a flow rate of the exhaust gas flowing in each of the plurality of downstream-side exhaust gas discharge lines.

7. The spray drying system according to claim 1 ,
wherein the exhaust gas introduction line includes:
a plurality of upstream-side exhaust gas introduction lines wherein an upstream-side exhaust gas introduction line among the plurality of upstream-side exhaust gas introduction lines is connected to each of the plurality of exhaust gas ducts;
an introduction-side merge part at which each of the plurality of upstream-side exhaust gas introduction lines merge; and
a single downstream-side exhaust gas introduction line connecting the introduction-side merge part and the at least one spray drying device,
wherein the spray drying system further comprises:
a second flow-rate adjusting part disposed in each of the plurality of upstream-side exhaust gas introduction lines, the second flow-rate adjusting part being capable of adjusting a flow rate of the exhaust gas flowing in each of the plurality of upstream-side exhaust gas introduction lines; and
a third flow-rate adjusting part disposed in each of the plurality of downstream-side exhaust gas discharge lines, the third flow-rate adjusting part being capable of adjusting a flow rate of the exhaust gas flowing in each of the plurality of downstream-side exhaust gas discharge lines.

8. The spray drying system according to claim 1 , further comprising a heating device disposed in at least one of the exhaust gas discharge line or a bottom part of the spray drying device, the heating device being configured to heat in at least one of the exhaust gas discharge line or the bottom part of the spray drying device.

9. The A spray drying system for drying wastewater to be dried, the spray drying system comprising:
an exhaust gas introduction line for introducing an exhaust gas discharged from an exhaust gas generation source, the exhaust gas introduction line being connected to a plurality of exhaust gas ducts for allowing the exhaust gas to flow through, the exhaust gas introduction line branches from each of the plurality of exhaust gas ducts and being configured to extract the exhaust gas from each of the plurality of exhaust gas ducts, the exhaust gas generation source being configured to generate the exhaust gas by combusting a fuel; and
at least one spray drying device connected to the exhaust gas introduction line and configured to bring the exhaust gas introduced from the exhaust gas introduction line into contact with the wastewater,
wherein the exhaust gas introduction line includes:
a plurality of upstream-side exhaust gas introduction lines, wherein an upstream-side exhaust gas introduction line among the plurality of upstream-side exhaust gas introduction lines is connected to each of the plurality of exhaust gas ducts;
an introduction-side merge part at which each of the plurality of upstream-side exhaust gas introduction lines merge; and
a single downstream-side exhaust gas introduction line connecting the introduction-side merge part and the at least one spray drying device, and
wherein the number of spray drying devices is smaller than the number of the plurality of exhaust gas ducts,
wherein the spray drying system further comprises:
a first flow-rate adjusting part disposed in the downstream-side exhaust gas introduction line, the first flow-rate adjusting part being capable of adjusting a flow rate of the exhaust gas flowing in the downstream-side exhaust gas introduction line;
an exhaust gas discharge line connecting the spray drying device and the plurality of exhaust gas ducts;
a temperature detection unit disposed in a bottom part of the spray drying device or the exhaust gas discharge line, the temperature detection unit being configured to detect a temperature in the bottom part of the spray drying device or the exhaust gas discharge line; and
a control device configured to control the first flow-rate adjusting part so that a temperature detected by the temperature detection unit is not lower than an evaporation temperature of the wastewater.

10. A spray drying system for drying wastewater

Assignees

• Mitsubishi Hitachi Power Sys
• Mitsubishi Power Ltd

Inventors

• Fukuda Toshihiro
• Sugita Satoru
• Ushiku Tetsu
• Kagawa Seiji

Classifications

• C02F1/12 Primary

  Spray evaporation · CPC title

• C02F2101/101

  Sulfur compounds · CPC title

• F23J15/04

  using washing fluids {(scrubbers for removing solids only F23J15/022)} · CPC title

• F23J2215/20

  Sulfur; Compounds thereof · CPC title

• B01D53/50

  Sulfur oxides (B01D53/60 takes precedence) · CPC title