Tail gas sulfur extraction device with high recovery rate

Abstract

The utility model discloses a tail gas sulfur extraction device with high recovery rate, which comprises a base, a pretreatment mechanism assembled at the top of the base, a spraying mechanism assembled in the pretreatment mechanism and a Claus reactor mechanism assembled at the top of the base, a first reaction chamber and a second reaction chamber are respectively formed in the treatment box. The utility model relates to the technical field of chemical treatment. According to the tail gas sulfur extraction device with the high recovery rate, by arranging the pretreatment mechanism, a sprayed catalyst can collide with a blade plate, the catalyst can be irregularly splashed by utilizing an arc-shaped groove and can be subjected to a rapid mixing reaction with tail gas, and a secondary mixing reaction is performed in cooperation with a second reaction chamber; the catalyst and the tail gas can be fully and thoroughly reacted, so that the recovery rate of sulfur in the tail gas can be subsequently improved, and the treatment effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical tail gas treatment, in particular to a tail gas sulfur extraction device with a high recovery rate. Background Art

[0002] Since the industrialization of the improved Claus process in the 1930s, sulfur recovery production using H2S-containing acid gas as raw material has developed rapidly. In particular, since the 1950s, large quantities of sulfur-containing crude oil and natural gas have been mined and processed, and the Claus process has been widely used in industry to recover elemental sulfur. After nearly half a century of evolution, the Claus process has made great progress in catalyst development, automatic control instrumentation application, material and anti-corrosion technology improvements, etc. However, in terms of process technology, the basic design has not changed much, and the commonly used process is still the direct flow or split flow process.

[0003] Due to the limitations of chemical reaction equilibrium at reaction temperature, even under good equipment and operating conditions, using a highly active catalyst and a three-stage conversion process, the Claus process sulfur recovery rate can only reach a maximum of about 97%. The remaining H2S, gaseous sulfur and sulfides, which are equivalent to 3% to 4% of the sulfur processing capacity of the device, are finally discharged into the atmosphere in the form of SO2, seriously polluting the environment.

[0004] With the continuous development of society and the economy, the global crude oil supply is becoming heavier, with high-sulfur and high-metal content accounting for an increasing share. This has forced refineries to continuously develop new technologies and further process heavy crude oil. However, this further processing of crude oil and the production of low-sulfur oil products inevitably results in large amounts of H2S gas as a by-product. Traditionally, H2S-containing acid gas has been recovered using the Claus process. However, with the increasing emphasis on environmental protection in various countries, stricter environmental regulations have been enacted, forcing refiners to continuously improve processes, enhance equipment efficiency, and reduce sulfur emissions from tail gas.

[0005] However, there are many methods for sulfur recovery, such as absorption method, catalytic conversion method, etc. Among them, the catalytic conversion method has the advantages of high efficiency and environmental protection, and the technology is relatively mature. In the process of sulfur extraction from industrial tail gas, it is usually necessary to add a catalyst to the reactor for mixing reaction with the tail gas. However, the flow velocity, direction and distribution of the tail gas may be uneven, which will lead to insufficient contact between the catalyst and the tail gas in some areas. At the same time, the loading method of the catalyst in the reactor may affect the uniformity of its distribution. If the loading is uneven, the contact area between the catalyst and the tail gas will be reduced, the catalyst and the tail gas will not be mixed thoroughly, the subsequent sulfur recovery rate will be reduced, and the tail gas treatment effect will be reduced. For this reason, the applicant proposes a tail gas sulfur extraction device with a high recovery rate to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a tail gas sulfur extraction device with high recovery rate to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a tail gas sulfur extraction device with a high recovery rate, comprising a base and a pretreatment mechanism mounted on the top of the base, a spray mechanism mounted inside the pretreatment mechanism, and a Claus reactor mechanism mounted on the top of the base;

[0008] The pretreatment mechanism includes a treatment box fixedly mounted on the top of the base, wherein a first reaction chamber and a second reaction chamber are respectively provided inside the treatment box, wherein a rotating rod is rotatably mounted inside the first reaction chamber and the second reaction chamber, and a plurality of blades distributed in a ring array are fixedly mounted on the outer side of the rotating rod, and a plurality of arc-shaped grooves arranged in a matrix are provided on both sides of the blades;

[0009] The spray mechanism includes two groups of arc-shaped spray pipes fixedly installed inside the processing box and respectively located on one side of the first reaction chamber and the second reaction chamber. Spray heads are evenly distributed on one side of the arc-shaped spray pipe.

[0010] Preferably, an air inlet pipe is fixedly installed on one side of the processing box, and the air inlet pipe is communicated with the first reaction chamber.

[0011] Preferably, a collection chamber is located inside the processing box and at the bottom of the first reaction chamber and the second reaction chamber, and the collection chamber is connected to the first reaction chamber and the second reaction chamber through a guide hole.

[0012] Preferably, a sewage pipe is fixedly installed at the bottom of the processing box, and the sewage pipe and the collection chamber are communicated with each other.

[0013] Preferably, a mounting groove for fixing the arc-shaped spray pipe is provided inside the processing box, and the rotating rods are installed through belt transmission.

[0014] Preferably, a motor is fixedly mounted on the front end of the processing box, and the output shaft of the motor passes through the processing box and is fixedly connected to the rotating rod.

[0015] Preferably, a delivery pump is fixedly installed on the top of the processing box, and a delivery pipe is connected between the delivery pump and the arc-shaped spray pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The tail gas sulfur extraction device with a high recovery rate is equipped with a pretreatment mechanism, which can guide the tail gas into the first reaction chamber, so that the catalyst sprayed by the spray mechanism can collide with the blade. The arc-shaped grooves on the blade can be used to make the catalyst splash around irregularly during the collision, so that the catalyst can quickly mix and react with the tail gas. The slow rotation of the blade can reduce the flow speed of the tail gas, so that the tail gas can circulate at a uniform speed and undergo a secondary mixing reaction through the second reaction chamber. The catalyst and the tail gas can be fully and thoroughly reacted, so that the recovery rate of sulfur in the tail gas can be effectively improved subsequently, thereby improving the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 This is a rear view structural diagram of the utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the blade structure of the utility model;

[0023] Figure 5 This is a schematic cross-sectional structural diagram of the processing box of the present utility model;

[0024] Figure 6 This is a schematic diagram of the spray mechanism structure of the present utility model.

[0025] In the figure: 1. Claus reactor mechanism; 2. base; 3. pretreatment mechanism; 301. treatment box; 302. air inlet pipe; 303. sewage pipe; 304. belt; 305. first reaction chamber; 306. second reaction chamber; 307. rotating rod; 308. collecting chamber; 309. guide hole; 4. motor; 5. spray mechanism; 501. delivery pump; 502. delivery pipe; 503. arc-shaped spray pipe; 504. nozzle; 6. blade; 601. arc-shaped groove; 7. mounting groove. DETAILED DESCRIPTION

[0026] The following embodiments will be described in detail with reference to the accompanying drawings. Similar or identical parts are denoted by the same reference numerals in the drawings and descriptions. In actual applications, the shape, thickness, or height of each component may be enlarged or reduced. The embodiments listed in the present invention are intended only to illustrate the present invention and are not intended to limit its scope. Any obvious modifications or variations to the present invention do not depart from the spirit and scope of the present invention.

[0027] See also Figure 1-6 As shown, the utility model proposes a tail gas sulfur extraction device with a high recovery rate, comprising a base 2 and a pretreatment mechanism 3 assembled on the top of the base 2, as well as a spray mechanism 5 assembled inside the pretreatment mechanism 3 and a Claus reactor mechanism 1 assembled on the top of the base 2. The pretreatment mechanism 3 includes a treatment box 301 fixedly mounted on the top of the base 2, and a first reaction chamber 305 and a second reaction chamber 306 are respectively provided inside the treatment box 301. A rotating rod 307 is rotatably installed inside the first reaction chamber 305 and the second reaction chamber 306. A plurality of blades 6 distributed in a ring array are fixedly mounted on the outer side of the rotating rod 307, and a plurality of arc grooves 601 arranged in a matrix are provided on both sides of the blade 6. The spray mechanism 5 includes two groups of arc spray pipes 503 fixedly mounted inside the treatment box 301 and located on one side of the first reaction chamber 305 and the second reaction chamber 306, respectively. Nozzles 504 are evenly distributed on one side of the arc spray pipe 503.

[0028] Based on the above-mentioned structural setting, the tail gas sulfur extraction device with high recovery rate is composed of a Claus reactor mechanism 1, a base 2, a pretreatment mechanism 3 and a spray mechanism 5, wherein the tail gas is introduced into the pretreatment mechanism 3 and sprayed by the spray mechanism 5. The pretreatment mechanism 3 can slow down the flow rate of the tail gas and can be thoroughly mixed with the sprayed catalyst, thereby improving the reaction effect. The pretreated tail gas is subjected to sulfur recovery treatment by the Claus reactor mechanism 1, thereby effectively improving the recovery efficiency. Specifically, in the working process, the tail gas is introduced into the first reaction chamber 305 in the treatment box 301, the catalyst solution is introduced into the arc-shaped spray pipe 503, and the catalyst is sprayed out through the nozzle 504, which can react chemically with the tail gas. The rod 307 drives the blade 6 to rotate slowly, and the exhaust gas can be blocked by the blade 6 to flow slowly, thereby improving the reaction time of the exhaust gas and the catalyst. At the same time, when the catalyst is sprayed out, it can collide with the rotating blade 6. Through the arc-shaped groove 601, the water splashes generated during the collision can be splashed irregularly, so that the catalyst can be fully mixed with the exhaust gas to react, thereby improving the reaction effect. After the reaction, the exhaust gas can be introduced into the second reaction chamber 306 for a secondary mixing reaction, which can fully react the catalyst with the exhaust gas. The exhaust gas after the reaction is introduced into the Claus reactor mechanism 1. The Claus reactor mechanism 1 is an existing treatment technology, which can recover and treat the sulfur in the exhaust gas, effectively improve the recovery rate of sulfur in the exhaust gas, and improve the treatment effect.

[0029] Furthermore, an air inlet pipe 302 is fixedly installed on one side of the processing box 301, and the air inlet pipe 302 is connected to the first reaction chamber 305. The exhaust gas can be introduced into the first reaction chamber 305 through the air inlet pipe 302 for reaction operation.

[0030] Furthermore, inside the treatment box 301, a collection chamber 308 is located at the bottom of the first reaction chamber 305 and the second reaction chamber 306. The collection chamber 308 is connected to the first reaction chamber 305 and the second reaction chamber 306 via a diversion hole 309. The wastewater after the exhaust gas is sprayed in the first reaction chamber 305 and the second reaction chamber 306 by the spraying mechanism 5 can flow into the collection chamber 308 through the diversion hole 309 for collection.

[0031] Furthermore, a drain pipe 303 is fixedly installed at the bottom of the treatment box 301, and the drain pipe 303 is connected to the collection chamber 308. The drain pipe 303 is provided with an on-off valve, which can be used to conveniently drain the sewage in the collection chamber 308 for treatment.

[0032] Furthermore, the interior of the processing box 301 is provided with a mounting slot 7 for securing the arc-shaped spray pipe 503. The rotating rods 307 are mounted together via a belt 304. The mounting slot 7 has the same shape as the arc-shaped spray pipe 503, allowing the arc-shaped spray pipe 503 to be secured within the mounting slot 7. The belt 304 allows one rotating rod 307 to rotate, driving the other rotating rod 307 to rotate as well, thereby facilitating the simultaneous rotation of the blades 6 in the first and second reaction chambers 305, 306.

[0033] Furthermore, a motor 4 is fixedly mounted on the front end of the processing box 301, and the output shaft of the motor 4 passes through the processing box 301 and is fixedly connected to the rotating rod 307. The motor 4 can provide power to the rotating rod 307, so as to drive one of the rotating rods 307 to rotate.

[0034] Furthermore, a delivery pump 501 is fixedly mounted on the top of the processing box 301, and a delivery pipe 502 is connected between the delivery pump 501 and the arc-shaped spray pipe 503. The delivery pump 501 can be easily connected to the feeding equipment to facilitate the extraction of the catalyst solution, and the delivery pipe 502 can be used to introduce the catalyst solution into the arc-shaped spray pipe 503 for spraying.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0036] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A tail gas sulfur extraction device with high recovery rate, characterized by: It comprises a base (2) and a pretreatment mechanism (3) mounted on the top of the base (2), a spray mechanism (5) mounted inside the pretreatment mechanism (3), and a Claus reactor mechanism (1) mounted on the top of the base (2); The pretreatment mechanism (3) comprises a treatment box (301) fixedly mounted on the top of the base (2), wherein a first reaction chamber (305) and a second reaction chamber (306) are respectively provided inside the treatment box (301), wherein a rotating rod (307) is rotatably mounted inside the first reaction chamber (305) and the second reaction chamber (306), wherein a plurality of blades (6) distributed in a ring array are fixedly mounted on the outer side of the rotating rod (307), and a plurality of arc-shaped grooves (601) arranged in a matrix are provided on both sides of the blades (6); The spray mechanism (5) comprises two sets of arc-shaped spray pipes (503) fixedly installed inside the processing box (301) and located on one side of the first reaction chamber (305) and the second reaction chamber (306), respectively. Spray heads (504) are evenly distributed on one side of the arc-shaped spray pipes (503).

2. The tail gas sulfur extraction device with high recovery rate according to claim 1, characterized in that: An air inlet pipe (302) is fixedly installed on one side of the processing box (301), and the air inlet pipe (302) is communicated with the first reaction chamber (305).

3. The tail gas sulfur extraction device with high recovery rate according to claim 1, characterized in that: A collection chamber (308) is located inside the processing box (301) and at the bottom of the first reaction chamber (305) and the second reaction chamber (306). The collection chamber (308) is connected to the first reaction chamber (305) and the second reaction chamber (306) through a guide hole (309).

4. The tail gas sulfur extraction device with high recovery rate according to claim 3, characterized in that: A sewage pipe (303) is fixedly installed at the bottom of the processing box (301), and the sewage pipe (303) and the collection chamber (308) are in communication with each other.

5. The tail gas sulfur extraction device with high recovery rate according to claim 1, characterized in that: The interior of the processing box (301) is provided with a mounting groove (7) for fixing the arc-shaped spray pipe (503), and the rotating rods (307) are installed by means of a belt (304).

6. The tail gas sulfur extraction device with high recovery rate according to claim 1, characterized in that: A motor (4) is fixedly mounted on the front end of the processing box (301), and an output shaft of the motor (4) passes through the processing box (301) and is fixedly connected to the rotating rod (307).

7. The tail gas sulfur extraction device with high recovery rate according to claim 1, characterized in that: A delivery pump (501) is fixedly installed on the top of the processing box (301), and a delivery pipe (502) is connected between the delivery pump (501) and the arc-shaped spray pipe (503).

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