Process and apparatus for cooling a gas containing SO2 and/or SO3 and water

Patent metadata

Field	Value
Publication number	US-10294105-B2
Application number	US-201615744307-A
Country	US
Kind code	B2
Filing date	Jun 30, 2016
Priority date	Jul 27, 2015
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

The above mentioned invention describes a process for cooling a gas mixture of SO 2 and/or SO 3 and water, wherein the gas mixture is cooled by means of a first heat exchanger carrying a coolant. The temperature of the coolant lies above the dew point of the gas or gas mixture.

First claim

The invention claimed is:

1. A process for cooling a gas mixture of SO 2 and/or SO 3 and water comprising cooling the gas mixture with a first heat exchanger carrying a coolant, wherein the temperature of the coolant lies above the dew point of the gas or gas mixture, the coolant is water, and the dew point τ given in ° C. is calculated according to the following equation:

τ
=

e

(

6.0006
-

(

3.158
·

10

-
7

p
·
1.244
·

10

-
9

·
c

)

)

+

(

0.1387
·

ln
⁡

(

p
·
1.244
·

10

-
9

·
c

)

)

with

p
=

gas
⁢

⁢
pressure
⁢

⁢
in
⁢

⁢
mbar
⁢

⁢
a
⁢

⁢
and

c
=

water
⁢

⁢
content
⁢

⁢
in
⁢

⁢

mg
/

Nm
3

.

2. The process according to claim 1 , wherein the water content is determined by a method based on a laser diode system.

3. The process according to claim 1 , wherein the gas mixture is cooled from a temperature between 400 and 500° C. to a temperature between 130 and 180° C.

4. The process according to claim 1 , wherein the coolant is heated so that the coolant at least partly evaporates.

5. The process according to claim 1 , wherein the gas mixture is guided through the first heat exchanger counterflow to the coolant.

6. The process according to claim 1 , wherein a second heat exchanger is provided before the first heat exchanger and that the coolant is guided first through the second heat exchanger and then through the first heat exchanger.

7. An apparatus for cooling a gas mixture of SO 2 and/or SO 3 and water comprising a first coolant-carrying heat exchanger with an inlet and an outlet for the coolant, a control or regulating device which adjusts the temperature of the coolant at the inlet to a temperature above the dew point of the gas or gas mixture, and a measuring device for determining the water content of the gas mixture, which is coupled with the control or regulating device such that the dew point τ given in ° C. is calculated according to the following equation:

τ
=

e

(

6.0006
-

(

3.158
·

10

-
7

p
·
1.244
·

10

Assignees

• Outotec Finland Oy

Inventors

• Daum Karl-Heinz
• Storch Hannes
• Neumann Ralf
• Schalk Wolfram

Classifications

• C01B17/806 Primary

  Absorbers; Heat exchangers · CPC title

• C01B17/60

  Isolation of sulfur dioxide from gases · CPC title

• F28F2200/00

  Prediction; Simulation; Testing · CPC title

• F28D2020/0082

  Multiple tanks arrangements, e.g. adjacent tanks, tank in tank · CPC title

• F28F27/02

  for controlling the distribution of heat-exchange media between different channels ({static flow control means in header boxes F28F9/026}; arrangements of guide plates or guide vanes F28F9/22, F28F25/12) · CPC title