JP3274426B2 - Solid circulation between fluidized bed sulfurization and regeneration reactors for high temperature dry desulfurization using non-mechanical valves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid circulation device between a fluidized bed sulfurization and regeneration reactor in a high temperature dry fluidized bed desulfurization unit for removing hydrogen sulfide from coal gasification. In this process, the solid (desulfurizing agent) is charged into the first reactor (desulfurizing), and while the coal gas is injected from the lower part of the reactor to remove the hydrogen sulfide mixed with the coal gas, the desulfurizing agent is combined with the cyclone. Second reactor (regeneration) through first circulation device
Transfer to

[0002] The desulfurizing agent having adsorbed hydrogen sulfide in the desulfurization reactor reacts with the oxidizing gas in the regeneration reactor, and is re-transferred to the desulfurization reactor through the second circulation device simultaneously with the regeneration. This is a high-temperature dry desulfurization system that continuously repeats desulfurization and regeneration by shutting off the gas and moving only the solid between the two reactors in such a process.

[0003]

2. Description of the Related Art In a conventional high-temperature (less than 1000 ° C.) solid circulation system, a part where a solid flow stagnates or a gas reverse flow may occur, so a special mechanical system for improving desulfurization and regeneration efficiency. There was a problem that a valve had to be used and complicated equipment had to be provided.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has been made in consideration of the following problems.
t) Disperse the flowing gas through the lower perforated plate and inject the solid transfer gas into the sides to allow the solid to flow smoothly, while at the same time allowing the dense solid to release the gas resulting from the pressure difference between the two reactors. Uses a device that continuously performs desulfurization and regeneration while preventing backflow, and a non-mechanical valve that has the feature of enabling the density of solids in the desulfurization reactor to be adjusted to promote the above functions and increase the desulfurization efficiency It is an object of the present invention to provide a solid circulation device between a fluidized bed sulfurization and regeneration reactor for high temperature dry desulfurization.

[0005]

Means for Solving the Problems Coal gas is dispersed through a gas dispersion plate, and a circulating solid (desulfurizing agent) is brought into uniform contact with the gas to increase the desulfurization efficiency. A solid circulation device is installed between the reactors to block the gas flowing backward, and to prevent the gas from flowing back, and to use two circulation devices (Sealpot) for circulating the solid.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a solid circulation apparatus and a configuration between a fluidized bed sulfurization and regeneration reactor for high temperature dry desulfurization according to the present invention will be described with reference to the drawings. The apparatus shown in FIG. 1 has a gas distribution plate 6 installed in reactors 1 and 2 and circulation devices 4 and 5, a cyclone 3 installed at an upper end of the reactor 1, and a coal gas section for transfer and fluidization at a lower end. 7 at the lower end of the reactor 2
Is installed.

In the apparatus shown in FIG. 2, a gas dispersion plate 6 is installed in the reactors 1 and 2 and the circulating device 4, a cyclone 3 is installed at the upper end of the reactor 1, and a transfer and fluidized coal gas section is installed at the lower end. 7
Is provided with a fluidized oxidizing gas portion 8 at the lower end of the reactor 2. This apparatus is a modification of the apparatus shown in FIG. 1, in which a circulating device 5 is positioned below the reactor 2 so that solids from the reactor 2 flow downward to increase the solid density in the reactor 1 and seal the solids. (Seal) uses two circulation devices characterized by increasing the backflow prevention effect.

[0008] The apparatus shown in FIG.
, A cyclone 3 is installed at the upper end of the reactor 1, and a transported and fluidized coal gas section 7 is installed at the lower end,
A fluidized oxidizing gas section 8 is provided at the lower end of the reactor 2.
This apparatus is a modified example of the apparatus shown in FIG. 2, and is provided with another circulation apparatus and an L-valve 5 'in place of the circulation apparatus (5 in FIG. 2) at the lower part of the reactor 2, so that the width of change in the solid circulation amount can be changed. One circulating device 4 and one L, characterized in that the solids density in the reactor 1 and the backflow prevention effect are increased.
-Utilizing a circulation device of the valve 5 '.

The principle of operation of this system is as follows. A fixed amount of a desulfurizing agent is put into the reactors 1 and 2 and the circulation devices 4 and 5, and coal gas is blown into the reactor 1 through the gas dispersion plate 6. Begins. The desulfurizing agent substance put in the reactor 1 adsorbs the sulfur component contained in the coal gas.
Gas and solids are separated by the first circulator 4
Through the reactor 2.

The desulfurizing agent adsorbing the sulfur flowing into the reactor 2 recovers its original performance by the oxidizing gas 8 and is again injected into the reactor 1 through the second circulation device 5. In the regeneration step at this time, sulfur dioxide is generated, which is recovered after being converted into elemental sulfur by a sulfur recovery device.

[0011]

As described above, according to the present invention, coal gas is dispersed through a gas dispersion plate, and the circulating solid (desulfurizing agent) is brought into uniform contact with the gas to increase the desulfurization efficiency and transfer the solid. At the same time, a solid circulating device is installed between the two reactors for desulfurization and regeneration to block the gas flowing backward, adjust the solid density in the reactor, smooth the flow of the solid, and prevent the gas from flowing backward and circulate the solid. A solid circulation system between fluidized bed sulfurization and regeneration reactors for high temperature dry desulfurization using a circulation device,
Since there is no portion where the flow of solids stagnates and no mechanical valve is used, the equipment is simple and economically applicable to the relevant industrial field.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a solid circulation apparatus between a fluidized bed sulfurization and regeneration reactor for high temperature dry desulfurization using a non-mechanical valve of the present invention.

FIG. 2 is a schematic diagram showing a modification of FIG.

FIG. 3 is a schematic diagram showing a modification of FIG. 2;

[Description of Signs] 1 First reactor 2 Second reactor 3 Cyclone 4 First circulator 5 Second circulator 6 Gas dispersion plate 7 Transfer and fluidizing gas section 8 Fluidizing oxidizing gas section

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hang Geun-Hee South Korea Taejong-si Dock Bobdon 190 Samikso-Wol Apartment 102-606 (72) Inventor Chou Sung-ho South Korea Taejong-si Sok Dunsang Dong-Hyangchon Apartment 107-506 ( 72) Inventor Bedar-Hee Republic of Korea Taejongsi Yusung-k Sung-dong 160-1 Hanul apartment 105-305 (72) Inventor Park Jae-Hyun Republic of Korea Taejongsi Yousung-Joongmin-dong Expo apartment 110-1402 (72) Inventor Song Do-won 462-4, Daejeong-si, Yusong-ku, Jung-min-dong, Republic of Korea 107-1404 (56) References JP-A-9-217070 (JP, A) JP-A-9-208969 (JP, A) JP-A-7- 53970 (JP, A) JP-A-10-235145 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C10K 1/32 B01J 8/18

Claims (4)

(57) [Claims] 1. A high-temperature dry desulfurization apparatus for dispersing coal gas through a gas dispersion plate, bringing a circulating solid (desulfurizing agent) into uniform contact with the gas to enhance desulfurization efficiency, and transferring the circulating solid. It is configured to be transferred from the top of the desulfurization reactor to the top of the regeneration reactor, and to be transferred from the bottom of the regeneration reactor to the bottom of the desulfurization reactor.
Non-mechanical valve characterized by using two circulators to install a solid circulation device between two reactors to block the backflowing gas, smooth the solid flow, and circulate the solid Fluidized bed sulfurization for high temperature dry desulfurization using a solid circulator between regeneration reactors. 2. The two reactors for desulfurization and regeneration and the two reactors
A gas dispersion plate was installed in each circulation device, a cyclone was installed at the upper end of the desulfurization reactor, a coal gas part for transfer and fluidization was installed at the lower end, and a fluidized oxidizing gas part was installed at the lower end of the regeneration reactor. A solid circulation device between a fluidized bed sulfurization and regeneration reactor for high temperature dry desulfurization using the non-mechanical valve according to claim 1. 3. A gas dispersion plate is installed in the two reactors for desulfurization and regeneration and a circulator for transferring circulating solids from the desulfurization reactor to the regeneration reactor, and a cyclone is installed at the upper end of the desulfurization reactor and at the lower end. Transfer and fluidized coal gas section is regenerated by installing a fluidized oxidizing gas section at the lower end of the regeneration reactor, and a circulating device for transferring circulating solids from the regeneration reactor to the desulfurization reactor is located below the regeneration reactor. The circulating solids from the reactor were discharged from the regenerating reactor to the circulating device for transferring the circulating solids to the desulfurization reactor to increase the solid density in the desulfurization reactor and to increase the backflow prevention effect by sealing the solids. A solid circulation device between a fluidized bed sulfurization and regeneration reactor for high temperature dry desulfurization using the non-mechanical valve according to claim 1. 4. An L-valve, which is another circulating device, is installed in place of the lower circulating device from the regenerating reactor to increase the range of change in the amount of circulating solids, thereby reducing the amount of solid circulating in the desulfurizing reactor. 3. The solid circulation device between a fluidized bed sulfurization and regeneration reactor for high temperature dry desulfurization using a non-mechanical valve according to claim 2, wherein the solid density increase and the backflow prevention effect are increased.
Place .