JPS6052857B2 - catalytic reactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the modification of a reactor filled with a granular catalyst, in which a catalyst regeneration and a reaction zone are provided in a single vessel;
Catalyst regeneration area with granular catalyst.

This invention relates to a catalyst device in which particulate catalyst collected in one of the reaction areas is transferred to a catalyst regeneration area by a scoop conveyor installed in a container while being allowed to flow down naturally into the reaction area. In a catalytic reactor, if dust or other impurities are contained in the raw material gas supplied to the fixed bed reaction, the dust or other impurities will accumulate between the catalyst particles, resulting in pressure loss. There is a drawback that the catalytic activity increases and the catalytic activity also decreases.

Therefore, the raw material gas supplied to a fixed bed reactor generally needs to be a clean gas that does not contain dust or impurities, and the Claus process aimed at producing sulfur5 is no exception to this. In other words, since the currently widely used Claus method reactor is a fixed bed type, it is difficult to remove flue gas.
Dirty H2S and/or 502 contaminated with dust, ammonium sulfate, and acidic ammonium sulfate such as those obtained by sulfur technology.
10 because the contained gas cannot be treated. In contrast, moving bed reactors used in desulfurization and denitrification equipment have the advantage of being able to process even dirty gas. However, in conventional moving bed reactors, the catalyst must be regenerated outside the reactor, so when the catalyst is taken out of the reactor, sulfur condenses on the catalyst surface and causes catalyst fine particles. The problem of pore blockage is a problem. Special consideration must also be given to heating the catalyst transfer equipment between the reactor and regenerator and sealing the reactor. There is also a nine-color type, which has a large amount of catalyst wear due to the fact that the catalyst passes through many transfer devices. Tono: The present invention provides a new catalytic reactor that is capable of treating goo and gas containing dust and other impurities, and that does not have the drawbacks of conventional moving bed reactors. be.

In the catalytic reactor of the present invention, the upper side of the vertical container containing the granular catalyst is a catalyst regeneration area, and the lower side is a reaction area, and a screw conveyor spanning both areas is installed in the reactor to perform catalyst regeneration. A regeneration gas passage that intersects with the screw conveyor is inserted in the area to make the intersection of the screw conveyor and the regeneration gas passage permeable, and the granular catalyst that has flowed down by gravity through the catalyst regeneration area and the reaction area is transferred to the screw conveyor. It is characterized in that the catalyst is transferred from the bottom of the reaction zone to the catalyst regeneration zone.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The catalytic reactor of the present invention will be described in more detail below with reference to FIGS. 1 and 2, each showing a longitudinal cross-sectional view of a catalytic reactor that is an embodiment of the present invention.

1 and 2, a vertical reactor 1 is divided by a catalyst distributor 2 into a lower reaction area 3 and an upper catalyst regeneration area, and this catalyst regeneration area is used for intermediate layer regeneration. It consists of a section 5 and an upper layer 6. A screen 7 is installed at the lower side of the reaction area 3, and the catalyst within the reaction area 3 is supported by this. A screw conveyor 8 installed vertically in the reactor extends from the bottom of the reaction zone, through the reaction zone 3 and the intermediate layer 4, intersects the regeneration gas passage 9 in the regeneration section 5 to the upper layer 6, and The shaft of the conveyor is connected to a drive device 10 at the top of the reactor. In the regeneration section where the screw conveyor intersects the regeneration gas passage, the screw conveyor and the casing are made of breathable material. The inlet 11 for the raw material gas can be provided below the screen 7 as shown in FIG. 1, or may be provided above the screen 7 as shown in FIG. The outlet 12 for the produced gas is provided above the reaction zone 3, that is, below the catalyst distributing Y-republisher 2. In a catalytic reactor configured as described above, for example. The raw material gas with a ratio of H2S and SO2 of 2:1 is
It is introduced into the reactor through the inlet 11.

In this case, in the reactor shown in FIG. 1, some of the solid particles such as dust entrained in the raw material gas are removed from the raw material gas by the screen 7 before the raw material gas is dispersed into the reaction region. Separated. On the other hand, in the reactor shown in FIG.
be dispersed within. The dust that has entered the reaction area 3 is collected using the same principle as packed bed dust collection. Reaction area 3
The feed gas dispersed within the region comes into countercurrent contact with the catalyst stream flowing down the region, thereby causing a desired reaction, such as a Claus reaction. The produced gas is taken out of the reactor through outlet 12. The catalyst that has reached the screen 7 by flowing down within the reaction zone while contacting the raw material gas is collected at the bottom of the reaction zone 3 after fine particles are sieved under the screen.

The collected catalyst particles are transferred to the regeneration area in the upper stage of the reaction area by the screen conveyor 8, and after being regenerated by contacting the regeneration gas in a cross flow in the regeneration section 5, they are released into the upper layer 6. The regenerated catalyst then flows down from the upper layer 6 to the middle layer 4 and is further distributed into the reaction zone 3 via the catalyst distributor 2.The catalyst particles entering the reaction zone are brought into countercurrent contact with the feed gas. While flowing down naturally,
From the bottom of the reaction zone, it is transferred again to the regeneration zone. Fine particles such as dust remaining below the screen 7 are intermittently or continuously discharged by a discharger 14 at the bottom of the reactor. In the illustrated catalytic reactor, there is a possibility that part of the raw material gas may pass through the screw conveyor 8, so the screw conveyor 8 is set higher than the reaction area 3 to increase ventilation resistance and take care to prevent snake-by. It is preferable to do so.
Also, a part of the regeneration gas passing through the regeneration gas passage 9 may enter the reaction region through the upper layer 6 and the intermediate layer 4 or through the screw conveyor 8. Taking these into consideration, it is possible to ensure that the upper layer 6 and the middle layer 4 have sufficient height. Furthermore, by making the static pressure at the inlet and outlet of the reactor substantially the same as the static pressure at the inlet and outlet of the regeneration section, leakage to other parts as described above can be reduced to almost zero. As is clear from what has been described above, according to the catalytic reactor of the present invention, by driving the screw conveyor provided in the reactor at low speed, a moving bed with a low catalyst loss rate can be formed. Pressure loss due to dust blockage does not increase abnormally, so
Stable operation is possible.

Additionally, since the reactor is equipped with a screw conveyor, it is easy to maintain a constant temperature within the reaction zone.
It is possible to prevent catalyst pore clogging and surface coagulation from forming a film. Furthermore, since the catalyst can be continuously regenerated within the reactor and harmful trace components can be removed, a decrease in efficiency can be prevented. Therefore, by using the catalytic reactor of the present invention, it becomes possible to perform a catalytic reaction using dirty raw material gas.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views of a catalytic reactor according to an embodiment of the present invention, respectively. 1; Vertical reactor, 2; Catalyst distributor, 3; Reaction area, 4; Intermediate layer, 5; Regeneration section, 6; Upper layer, 7; Screen, 8; Screw conveyor, 9; Regeneration gas passage, 10 ; Drive device, 11; Raw material gas inlet, 12; Produced gas outlet, 13; Gas distributor, 14; Discharge machine.

Claims (1)

[Claims] 1 A screw conveyor spanning both areas is installed in the container, with the upper side of the vertical container containing the granular catalyst as a catalyst regeneration area and the lower side as a reaction area, and a regeneration gas passage that intersects with the screw conveyor in the catalyst regeneration area. The intersecting portions of the screw conveyor and the regeneration gas passage are made breathable by inserting the granular catalyst, and the granular catalyst that has flowed down the catalyst regeneration area and the reaction area by gravity is transferred from the bottom of the reaction area to the catalyst regeneration area using the screw conveyor. A catalytic reactor.