Fluidized bed solid circulation system using pressure and density difference, fluidized bed reaction system having the same and solid circulation method

Patent metadata

Field	Value
Publication number	US-10272408-B1
Application number	US-201815902341-A
Country	US
Kind code	B1
Filing date	Feb 22, 2018
Priority date	Dec 21, 2017
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

Disclosed is provided to overcome problems of conventional methods using each of a solid discharge nozzle and a screw conveyer. According to one exemplary embodiment of the present invention, a fluidized bed system is provided to circulate solids using pressure and density difference. More particularly, a fluidized solid circulation system using pressure and density difference is characterized by comprising: a first fluidized bed reactor; a second fluidized bed reactor; a first cyclone; a second cyclone; a first pressure control valve; a second pressure control valve; a lower loop seal; an upper loop seal; and a control part, thereby circulating the solids between the first fluidized bed reactor and the second fluidized bed reactor.

First claim

What is claimed is:

1. A system for circulating solids being inside the fluidized bed reactors therebetween using pressure and density difference in a fluidized bed reaction system having a plurality of fluidized bed reactors each of which is injected with a fluidizing gas, and a plurality of cyclones which separate gases and entrained solids discharged from each of the plurality of fluidized bed reactors, wherein the fluidized bed circulation system using pressure difference comprises:
a plurality of pressure control valves which are formed in each gas vent of a plurality of cyclones and control the internal pressure of each the plurality of fluidized bed reactor;
a lower loop seal which interconnects lower portions of the two fluidized bed reactors and is injected with a fluidizing gas;
an upper loop seal which interconnects sides of the two fluidized bed reactors and is injected with a fluidizing gas; and
a control part which controls each the pressure control valves and makes a pressure difference, that is, a difference between the internal pressure of the two fluidized bed reactors to be over a predetermined pressure difference, thereby circulating solids between the two fluidized bed reactors.

2. The fluidized bed solid circulation system using pressure difference of the claim 1 , wherein the lower loop seal comprises: a plenum which is equipped with a partition and is injected with a fluidizing gas from opposite sides; a distributor which is positioned at an upper portion of the plenum and has a plurality of pores, thereby permitting the fluidizing gas to move up to the upper portion; and a connection pipe which is positioned at an upper end of the distributor and each end portion of which is connected between the two fluidized bed reactors, thereby conveying the fluidizing gas to each the two fluidized bed reactors.

3. The fluidized bed solid circulation system using pressure difference of the claim 2 , wherein the upper loop seal comprises: a solid inlet pipe which flows in solids from one of the two fluidized bed reactor; a solid outlet pipe which flows out solids to the other; and a U shaped pipe which is positioned between the solid inlet pipe and the solid outlet pipe, and there is a height difference between a solid inlet height of the solid inlet pipe and a solid outlet height of the solid outlet pipe.

4. A fluidized bed reaction system having a solid circulation system using pressure difference comprising:
a first fluidized bed reactor which has a first fluidizing gas injection part to be injected with a fluidizing gas;
a second fluidized bed reactor which has a second fluidizing gas injected part to be injected with a fluidizing gas;
a first cyclone to which solids and gases are conveyed from the first fluidized bed reactor and which separates the conveyed solids and gases;
a second cyclone to which solids and gases are conveyed from the second fluidized bed reactor and which separates the conveyed solids and gases;
a first pressure control valve which is formed on a gas vent of the first cyclone and controls the internal pressure of the first fluidized bed reactor;
a second pressure control valve which is formed on a gas vent of the second cyclone and controls the internal pressure of the second fluidized bed reactor;
a lower loop seal which interconnects lower portions of the first fluidized bed reactor and the second fluidized bed reactor and is injected with a fluidizing gas;
an upper loop seal which interconnects sides of the first fluidized bed reactor and the second fluidized bed reactor and is injected with a fluidizing gas; and
a control part which controls each of the first pressure control valve and the second pressure control valve to make an internal pressure difference, that is, a difference between the internal pressure of the first fluidized bed reactor and the second fluidized bed reactor to be over a predetermined pressure difference, thereby circulating the solids between the first fluidized bed reactor and the second fluidized bed reactor.

5. The fluidized reaction bed system having a solid circulation system using pressure difference of the claim 4 , wherein the predetermined pressure difference is ΔP 2 represented by Formula 1 as below:

Δ
⁢

⁢

P
2

=

Δ
⁢

⁢

P
1

=

H
4

⁡

(

1
-

ɛ
mf

)

⁢

(

ρ
s

-

ρ
g

)

⁢

g

g
c

,

[

Formula
⁢

⁢
1

]

where H 4 is a difference between a solid bed height (H 2 ) of the second fluidized bed reactor and a solid bed height (H 1 ) of the first fluidized bed reactor, ΔP 1 is a pressure drop (pressure difference) [Pa] by the solid bed, corresponding to a height (H 2 ) of the second fluidized bed reactor, ε mf is a voidage [−] of the solid bed in the minimum fluidized bed condition, ρ s is a solid density [kg/m 3 ], ρ g is a gas density [kg/m 3 ], g c is a constant of gravitational acceleration, 1[(kgm)/(Ns 2 )], and g is gravitational acceleration, 9.8 [m/s 2 ].

6. The fluidized bed reaction system having a solid circulation system using pressure difference of the claim 5 , wherein the lower loop seal comprises: a plenum which is equipped with

Assignees

• Korea Insitute Of Energy Res
• Korea Inst Energy Res

Inventors

• Ryu Ho-Jung
• Lee Doyeon
• Jin Gyoung-Tae
• Yi Chang-Keun
• Shun Dowon
• Park Jaehyeon
• Bae Dal-Hee
• Jo Sung-Ho
• Lee Seung-Yong
• Park Young Cheol
• Moon Jong-Ho
• Lee Dong-Ho

Classifications

• B04C3/00

  Apparatus in which the axial direction of the vortex {flow following a screw-thread type line} remains unchanged {; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct (combined with other devices B04C9/00)} · CPC title

• B01J2208/00752

  Feeding · CPC title

• B01J19/0053

  Details of the reactor · CPC title

• B01J2208/00539

  Pressure · CPC title

• B01J8/1818

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