JPS58189024A - Moving bed type reactor for carbonaceous adsorbent - Google Patents

Abstract

PURPOSE:To miniaturize a desulfurization and denitration reactor, by a method wherein an adsorbent moving bed is divided into a front and a rear stages by a vertically directed partition wall and the gas passage of the outer side or the inner side of the moving bed is blocked while an NH3 injection port is provided to the unblocked gas passage. CONSTITUTION:A moving bed 1 for a carbonaceous adsorbent having an inverted U- shaped vertical cross sectional area is partitioned into a front and a rear two stages by a vertically directed partition wall 4 and an outside gas passage 10 is formed between the moving bed 1 and an outer casing 3 while an inside gas passage 11 is formed between both leg parts of the moving bed 1. The inside gas passage 11 is blocked by a partition wall 12 while an NH3 injection port P is opened into the outside gas passage 10. An exhaust gas introduced into a reactor from an inlet 13 is divided into two streams which in turn pass across the front stage moving bed 1 from the inside gas passage 11 and enter the outside gas passage 10 and, during this time, SOx in the exhaust gas is removed. In the next step, the exhaust gas passes across the rear stage moving bed 1 along with NH3 injected from a point P to enter the inside gas passage 11 and, during this time, NOx in the exhaust gas is removed. The combined exhaust gas subjected to desulfurization and denitration treatment is exhausted from an outlet 14.

Description

[Detailed Description of the Invention] The present invention eliminates combustion exhaust gas emitted from boilers, etc.
This invention relates to improvements in carbonaceous adsorbent moving bed reactors used in AS2M heddles.

When desulfurizing and denitrating combustion exhaust gas, a reactor is used in which the exhaust gas is brought into contact with a moving carbonaceous adsorbent such as activated carbon in a cross flow. Hereinafter, this type of reactor will be referred to as a carbonaceous adsorbent moving bed reactor, but this reactor is generally equipped with a moving bed of carbonaceous adsorbent lfi inside the reactor. Taka and J-Sai are used for rounding, shielding, and layer thickness, which allow the carbonaceous layer agent to pass smoothly through the layer, and to split the fibers within a range that does not cause excessive pressure loss to the exhaust gas passing through the moving bed pipe. As a general rule, it is not possible to increase the amount. 4
jE, if a large amount of exhaust gas is to be denitrified and denitrified at once, it is necessary to install a large number of O-legged elemental adsorbent moving bed reactors in parallel, so the reactor as a whole must be made more compact. It's difficult.

Therefore, the present invention provides a compact moving bed reactor for carbonaceous adsorbent for desulfurization and denitrification treatment in which the moving bed is divided into a plurality of parts and one reactor is housed therein. A vertical partition wall is provided in the carbonaceous adsorbent transfer layer having an inverted U-shaped vertical cross section to divide the transfer bed into two stages, front and rear, with a supply port for the carbonaceous adsorbent at the top of each stage and a discharge port for the carbonaceous adsorbent at the bottom. The moving layer is housed in an outer casing to form an outer gas passage between the casing and the moving layer, and an inner gas passage sandwiched between the moving layers is formed inside the moving layer. , the side wall of the transfer floor in contact with both gas passages is made permeable, the outer gas passage or the inner gas passage is blocked by a partition at the position corresponding to the vertical partition wall, and the gas passage in the uninterrupted gas passage is An ammonia inlet is opened at the above position, and exhaust gas ports leading to the outer gas passage or the inner gas passage are provided at the front and rear of the outer casing.

The structure of the carbonaceous adsorbent moving bed reactor according to Example 1 of the present invention will be explained with reference to the drawings. As shown in FIGS. 1 and 2, the reactor has an inverted U-shaped O carbon This structure has a solid adsorbent moving layer 1 housed in an outer casing 3. The moving bed 1 is divided into two stages, front and rear, with an inverted U-shape in vertical cross section by vertically oriented Wh11!4, and a carbonaceous adsorbent supply port 5 is provided at the top of each stage, and a discharge port is provided at the bottom of each stage. 6. A male will be provided. A flow regulator 7, 7' for the adsorbent flowing down in the moving bed 1 is provided above the discharge port 6, 6', and a discharge machine 8, 8' such as a rotary feeder is installed below.
. In this case, outlet a, c1%%ft, body r,
7' and ejectors shall be provided along the entire length of each stage. Incidentally, the reference numeral 9 indicates a hopper for the adsorbent discharged from the moving bed 1. The moving layer 1, which is divided into two stages, front and rear, by a vertical gap 114, is housed in the outer casing 3, as described above, and there is an outer gas passage between the moving layer 1 and the outer casing 3. 10 is formed,
Inside the moving layer 10, a gas passage 11 is formed in the moving layer. In this case, both walls of the moving layer that are in contact with both gas passages are composed of any permeable plate-like body such as an external hole plate or a louver. The outer gas passage or the inner gas passage is blocked at a position corresponding to the longitudinal partition wall II that divides the moving layer 1 into two stages, front and back, and an ammonia inlet P is provided at the position in the unblocked gas passage. However, in the embodiment shown in FIG. 2, the inner gas passage 11 is interrupted by the partition wall 12, and the ammonia inlet P is opened in the outer gas passage 10. Exhaust gas inlets and outlets 13 and 14 communicating with the inner gas passage 11 are opened at the front and rear of the outer casing 3. Therefore, in the nine embodiments shown in FIG. 2, for example, the compressed exhaust gas introduced into the reactor from the inlet 13 crosses the moving bed 1 in the preceding stage and enters the outer gas passage 1G. During p1, sulfur oxides in the exhaust gas are removed.

The exhaust gas then crosses the downstream moving bed and enters the inner gas passage 11 together with the ammonia injected from point P, during which the g-wood oxides in the exhaust gas are removed. The exhaust gas that has been denitrified in this way is discharged from the outlet 14.

A further embodiment is shown in horizontal view #a1g.

That is, by this embodiment Fi vertical partition wall 4, IiI
]The outer casing 3 is different from the previous embodiment in that the carbonaceous adsorbent transfer layer 1, which is divided into two stages and has an inverted U-shaped vertical cross section, is accommodated in the outer casing 3. The exhaust gas inlet/outlet 13.14 communicates with the outer gas passage 1o, and the outer gas passage 1o is connected by a gap -12,
An ammonia inlet P opens into the inner gas passage. Q is different from the previous embodiment. However, it is essentially identical to the longitudinal view of the reactor shown in horizontal cross-section in FIG. In the reactor shown in FIG. 3, the exhaust gas introduced into the reactor from the inlet 13 is passed through the outer gas passage 10. The inner gas passage 11 and the outer gas passage 10 traverse the two stages of transport wJml in the order of front and rear, and while an ammonia inlet is inserted along the way, the VL denitrification process is performed, and the gas is discharged from the outlet 14.

It is clear from the above that the carbonaceous adsorbent moving bed reactor of the present invention houses a moving bed with an inverted U-shaped longitudinal section in the outer casing, and the cough movement I- is separated into two stages, front and rear, by partition walls. The exhaust gas Fi introduced into this reactor is first divided into two parts in the outer gas passage or the inner gas passage, and the divided gases are processed in the front and rear stages, respectively, and then passed through the outer gas passage again. Or they will combine in the inner gas passages and be discharged from the reactor.

On the other hand, if the same process as mentioned above is carried out using a conventional carbonaceous adsorbent moving bed reactor, a total of four reactors are required, and the reactors are connected in series and in parallel. ν1
A gas pipe is required to connect to the reactor, and a mechanism for supplying and discharging the carbonaceous absorbent must be installed for each reactor. Therefore, according to the present invention, there is an advantage that the carbonaceous adsorbent moving bed reactor can be extremely compacted.

(9) If conventional carbonaceous adsorbent transfer-reactor is used to perform deregulated desulfurization of exhaust gas at the same time, at least two
Two reactors are connected in series, and while supplying ammonia from the ammonia inlet installed in the connecting piping, the upstream reactor is used as a feeder when viewed from the gas flow, and the downstream reactor is deregulated. However, according to the reactor of the present invention, denitrification and desulfurization of exhaust gas can be performed simultaneously with one compact reactor. The zero reaction benefit of the present invention can be used not only when desulfurization and denitrification are performed at the same time, but also when ammonia injection is omitted and only desulfurization treatment is targeted, and in this case, the desulfurization rate is higher. can be obtained −

[Brief explanation of drawings]

Figure 1 is a vertical wTIffi diagram of a carbonaceous adsorbent moving bed reactor according to Example 1 of the present invention, and Figure 2 is a diagram of Figure 102-
2- is a horizontal cross-sectional view at 2-. FIG. 3 is a horizontal sectional view of another embodiment of the side pressure reactor of the present invention.

Claims (1)

[Claims] 1. In a carbonaceous adsorbent moving bed reactor where a carbonaceous adsorbent moving bed and exhaust gas are in cross-flow contact, a vertical partition wall is provided in the vertical adsorbent moving bed with an inverted U-shaped longitudinal section. The moving bed is divided into two stages, front and rear, and a carbonaceous adsorbent 0 supply port is provided at the top of each R, and its discharge port is provided at the bottom. An outer gas passage is formed between them, and an inner gas passage sandwiched between the moving layers is formed inside the moving layer, and the side wall of the moving layer in contact with both gas passages is made permeable, and the vertical partition wall is The outer gas passage or the inner gas passage is blocked by a partition wall at the corresponding position, the ammonia inlet is opened at the position in the unsintered gas passage, and the exhaust gas inlet/outlet leading to the outer gas passage or the inner gas passage is opened at the said position. Outer casing O#l
111V-set up is a carbonaceous adsorbent moving bed reactor that uses 4I mold.