Fluidized bed system having sparger capable of minimizing blockage by solids and controlling method thereof

Patent metadata

Field	Value
Publication number	US-10143986-B2
Application number	US-201715689526-A
Country	US
Kind code	B2
Filing date	Aug 29, 2017
Priority date	Mar 27, 2017
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

The present invention relates to a fluidized bed system having a sparger capable of minimizing a blockage by solids and controlling method thereof. And, more specifically, the present invention relates to a fluidized bed system having a sparger capable of minimizing a blockage by solids comprising a fluidized bed reactor to store a solid layer with a certain height and to fluidize the solid layer by using fluidization gases; a sparger having a pipe shape submerged in the solid layer and having a plurality of gas-discharging holes to spray fluidization gases onto the solid layer; and a gas-supplying line having its one end contacting a gas-supplying source and the other end connected to the sparger, wherein fluidization gases are introduced through the gas-supplying line into the sparger by driving the gas-supplying source, the fluidization gases are sprayed through the gas-discharging holes onto the solid layer, the gas-supplying source is placed higher than the sparger and the height difference (H g ) between the gas-supplying source and the sparger is greater than the height of the solid layer.

First claim

The invention claimed is:

1. A fluidized bed system having a sparger, the fluidized bed system having a sparger capable of minimizing a blockage by solids comprising:
a fluidized bed reactor to store a solid layer with a certain height (H s ) inside and to fluidize the solid layer via injected fluidization gases;
a sparger having a pipe shape submerged in the solid layer in the fluidized bed reactor and having a plurality of gas-discharging holes to spray fluidization gases onto the solid layer;
a gas-supplying line having one end contacting a gas-supplying source and an other end connected to the sparger;
wherein fluidization gases flow through the gas-supplying line into the sparger and are sprayed through the gas-discharging holes onto the solid layer,
wherein the gas-supplying source is placed higher than the sparger and a height difference (H g ) between the gas-supplying source and the sparger is greater than the height of the solid layer (H s ).

2. The fluidized bed system having a sparger capable of minimizing a blockage by solids according to claim 1 ,
wherein the height difference (H g ), is greater than a total of the height of the solid layer (H s ) and a height (H p ) which is high enough to buffer maximum pressure fluctuations that can happen in a fluidized bed.

3. The fluidized bed system having a sparger capable of minimizing a blockage by solids according to claim 2 , wherein the height (H p ) which is high enough to buffer maximum pressure fluctuations is calculated by the following equation 1:

H
P

=

Δ
⁢

⁢

P
MAX

(

1
-

ɛ
mf

)

⁢

(

ρ
s

-

ρ
g

)

⁢

g
c

g

[

Equation
⁢

⁢
1

]

in the above described equation 1, wherein H p indicates a height which is high enough to buffer maximum pressure fluctuations, ΔPmax indicates a maximum pressure fluctuation in a fluidized bed, ε mf indicates voidage of a solid layer in a minimum fluidized state, ρ s indicates density of solids, ρ g indicates density of gases, g c indicates the gravitational acceleration constant, and g indicates gravitational acceleration.

4. The fluidized bed system having a sparger capable of minimizing a blockage by solids according to claim 3 ,
wherein the fluidized bed system having a sparger capable of minimizing a blockage by solids further comprises a controller to control driving of the gas-supplying source.

5. The fluidized bed system having a sparger capable of minimizing a blockage by solids according to claim 4 ,
wherein a subsidiary gas-injecting mouth is configured on one side of the gas-supplying line and, once driving of the gas-supplying source is stopped and then before it is resumed, subsidiary gases are injected through the subsidiary gas-injecting mouth into the gas-supplying line by driving the gas-supplying source.

6. The fluidized bed system having a sparger capable of minimizing a blockage by solids according to claim 5 ,
wherein the gas-supplying line comprises a sparger-connecting horizontal pipe connected to the sparger, a supplying-source-connecting horizontal pipe connected to the gas-supplying source and a vertical pipe connected between the sparger-connecting horizontal pipe and the supplying-source-connecting horizontal pipe.

7. The fluidized bed system having a sparger capable of minimizing a blockage by solids according to claim 6 ,
wherein the subsidiary gas-injecting mouth is provided in the vertical pipe, and wherein the controller controls the subsidiary gas-supplying source to inject subsidiary gases having flow velocity greater than or equal to a minimum fluidization velocity of solid particles.

8. The fluidized bed system having a sparger capable of minimizing a blockage by solids according to claim 6 ,
wherein the subsidiary gas-injecting mouth is provided on one side of the sparger-connecting horizontal pipe, and subsidiary gases are injected in a direction parallel to a length of the sparger-connecting horizontal pipe.

9. The fluidized bed system having a sparger capable of minimizing a blockage by solids according to claim 8 ,
wherein an end of the subsidiary gas-injecting mouth consists of an ejector, and the ejector is inserted into the sparger-connecting horizontal pipe.

10. A method of operating the fluidized bed system according to claim 4 ,
the method of operating the fluidized bed system having a sparger capable of minimizing a blockage by solids comprising the steps of installing a pipe-shaped sparger, having a plurality of gas-discharging holes, in the solid layer of a fluidized reactor;
connecting a gas-supplying source installed higher than the sparger and the sparger through a gas-supplying line;
introducing fluidization gases through the gas-supplying line into the sparger by driving the gas-supplying source, spraying the fluidization gases through the gas-discharging holes onto the solid layer, and fluidizing the solid layer,
wherein the height difference (H g ) between the gas-supplying source and the sparger is greater than the total of the height of the solid layer (H s ) and the height (H p ) which is high enough to buffer maximum pressure fluctuations that can happen in a fluidized bed.

11. The fluidized bed system according to claim 5 , in the method of resuming the driving of the gas-supplying source after the driving of the gas-supplying source is stopped,
the method of operating the fluidized bed system having a sparger capable of minimizing a blockage by solids comprising the steps of sopping the driving of the gas-supplying source;
injecting subsidiary gas through a subsi

Assignees

• Korea Inst Energy Res

Inventors

• Ryu Ho-Jung
• Bae Dal-Hee
• Jo Sung-Ho
• Lee Seung-Yong
• Yi Chang-Keun
• Jin Gyoung-Tae
• Shun Do-Won
• Park Jae-Hyeon
• Park Young Cheol
• Moon Jong-Ho
• Lee Hyo Jin
• Lee Do Yeon
• Lee Dong-Ho
• Baek Jeom In

Classifications

• B01J8/1809

  Controlling processes · CPC title

• B01J4/004

  Sparger-type elements · CPC title

• B01J8/1818 Primary

  Feeding of the fluidising gas (B01J8/44 takes precedence) · CPC title

• B01J2208/00548

  Flow · CPC title

• B01J8/1827

  the fluidising gas being a reactant · CPC title