CN211246031U - Hydrogen sulfide tail gas absorption system - Google Patents

Abstract

A hydrogen sulfide tail gas absorption system relates to the technical field of hydrogen sulfide absorption and comprises a secondary alkali liquor filtering and stirring kettle, a front absorption tower and a rear absorption tower which are sequentially connected, wherein a filter cavity connected with a bottom motor is arranged in the secondary alkali liquor filtering and stirring kettle, and a liquid inlet pipe is communicated with the top of the filter cavity; a demister, a first spraying layer with downward nozzles, a packing layer and a first liquid caustic soda layer are sequentially arranged in the front absorption tower from top to bottom, an air inlet is formed in the side wall between the packing layer and the first liquid caustic soda layer, a second spraying layer demister with upward nozzles and a second liquid caustic soda layer are sequentially arranged in the rear absorption tower from top to bottom, an air outlet is formed in the side wall between the demister and the second liquid caustic soda layer, and the front absorption tower and the rear absorption tower are connected through a gas pipe arranged at the top of the tower; the utility model discloses add secondary alkali lye and filter stirred tank, and preceding absorption tower and back absorption tower synergism, the pipeline is distributed rationally, when rational distribution uses alkali lye, can also guarantee the tail gas treatment effect to manufacturing cost has effectively been reduced.

Description

Hydrogen sulfide tail gas absorption system

Technical Field

The utility model relates to a hydrogen sulfide absorbs technical field, especially relates to a hydrogen sulfide tail gas absorption system.

Background

Hydrogen sulfide is a combustible colorless gas with a typical odor of eggs. In industrial production such as sewage treatment, paper making, petroleum processing, fertilizer manufacturing, chemical fiber manufacturing and the like, a large amount of hydrogen sulfide exists in products of certain chemical reactions and natural protein decomposition processes. The hydrogen sulfide is not only a choking poison, but also has obvious stimulation effect on mucous membranes, and when the concentration of the hydrogen sulfide is lower, the local stimulation on respiratory tracts and eyes is more obvious. When the concentration is high, free hydrogen sulfide in human body is not oxidized in time in blood, so that oxygen deficiency of cell tissue is caused, and systemic toxic reaction is caused. When the concentration of hydrogen sulfide is high, reflex action of carotid sinus is caused, and respiration stops. When the concentration of hydrogen sulfide is higher, the center is directly paralyzed to immediately cause asphyxiation, so that 'electric shock type' poisoning death is caused. Therefore, in order to respond to the national requirements of green and environment-friendly production and improve the production safety, hydrogen sulfide in tail gas generated in the production process needs to be absorbed and then discharged, however, in the existing hydrogen sulfide tail gas absorption system, the number of equipment is large, the occupied area is large, and the synergistic absorption effect between absorption towers is poor, so that the residual amount of hydrogen sulfide in the tail gas cannot meet the increasingly severe national requirements, and in addition, the usage amount of alkali liquor or absorbent for hydrogen sulfide absorption in the prior art is large, and the hydrogen sulfide absorption cost is increased.

For example, a "new hydrogen sulfide absorption system" disclosed in chinese patent literature, which publication No. CN104474864A, discloses a new hydrogen sulfide absorption system comprising a hydrogen sulfide reaction tank, a raw liquid absorption tower, a hydrogen sulfide harm removal tower, a gas-liquid separation tank, a slaked lime absorption tower; the invention adds the stock solution absorption tower, and improves the utilization rate of the hydrogen sulfide generated in the hydrogen sulfide reaction tank by further absorbing the hydrogen sulfide gas; compared with the prior art, the method has the advantages that the harmful-removing fan is arranged at the rear part of the harmful-removing tower, the harmful-removing fan is arranged at the front part of the harmful-removing tower, the leakage of hydrogen sulfide caused by the untight sealing of a shaft seal of the fan is avoided, the content of the hydrogen sulfide in tail gas can be further reduced by absorption of slaked lime, and the method can be more suitable for waste acid stock solution with complex component fluctuation. However, the invention has the disadvantages of large quantity of equipment and large occupied area, and the stock solution absorption tower, the hydrogen sulfide harm removal tower and the slaked lime absorption tower are simply connected and have poor synergistic effect, so that the residual amount of hydrogen sulfide in tail gas can not meet the increasingly severe national requirements.

Disclosure of Invention

The utility model relates to an overcome and cause hydrogen sulfide residual quantity in the tail gas at present and can't satisfy the increasingly harsh requirement of country to, it is great that the alkali lye or the absorbent use amount that are used for hydrogen sulfide absorption among the prior art is great, has increased hydrogen sulfide absorption cost scheduling problem, has provided one kind and has been equipped with secondary alkali lye and filter stirred tank, and the hydrogen sulfide tail gas absorption system of synergism between the absorption tower.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a hydrogen sulfide tail gas absorption system comprises a secondary alkali liquor filtering and stirring kettle, a front absorption tower and a rear absorption tower which are sequentially connected, wherein a filter cavity connected with a bottom motor is arranged in the secondary alkali liquor filtering and stirring kettle, and a liquid inlet pipe is communicated with the top of the filter cavity; preceding absorption tower is interior from last to being equipped with the first defroster, the decurrent layer that sprays of spout, packing layer and first liquid caustic soda layer down in proper order, and is equipped with the air inlet on the lateral wall between packing layer and the first liquid caustic soda layer, be equipped with the ascending second of spout from last to being equipped with in proper order down in the back absorption tower and spray layer defroster and second liquid caustic soda layer, and be equipped with the gas outlet on the lateral wall between defroster and the second liquid caustic soda layer, preceding absorption tower is connected through the gas-supply pipe of locating the top of the tower with the back absorption tower.

The utility model discloses set up the filter chamber alone in secondary alkali lye filters stirred tank, its mainly used filters the solid impurity in the secondary alkali lye, or the sodium sulfide that the crystallization was appeared, purifies the secondary alkali lye, prevents that the sodium sulfide that solid impurity or crystallization were appeared from influencing its and last the absorptivity when the secondary alkali lye absorbs hydrogen sulfide gas, increases absorptive effect and efficiency. Wherein, it has the feed liquor pipe to link up at the top of filter chamber, therefore secondary alkali lye can pass through the feed liquor pipe and get into in the filter chamber, because the bottom of filter chamber is connected with the motor of locating secondary alkali lye filtration stirred tank bottom, consequently, can drive the filter chamber fast rotation after the starter motor, secondary alkali lye in the filter chamber passes through filtration purification and enters into secondary alkali lye filtration stirred tank, can be used to the absorption of hydrogen sulfide, and solid impurity in the secondary alkali lye and sodium sulfide crystal etc. of appearing still exist in the filter chamber and wait to retrieve.

Moreover, the utility model adopts the synergistic effect of the front absorption tower and the rear absorption tower to treat the tail gas containing the hydrogen sulfide, and the difference from the prior art is that the structures of the front absorption tower and the rear absorption tower are not completely the same, so the effect of the synergistic treatment of the tail gas containing the hydrogen sulfide is better; wherein, the front absorption tower is internally provided with a demister, a first spraying layer with downward nozzles, a packing layer and a first liquid caustic soda layer from top to bottom in sequence, when tail gas containing hydrogen sulfide enters from an air inlet and flows upwards, the tail gas firstly passes through the packing layer to carry out first-step absorption, then the tail gas continuously rises, and simultaneously the first spraying layer sprays liquid caustic soda downwards, because the spraying direction is opposite to the tail gas flowing direction, the tail gas can be contacted with the sprayed liquid caustic soda to the maximum extent, the absorption of the hydrogen sulfide is further realized, then, after the tail gas passes through the demister for absorbing the moisture generated in the air by the reaction of the hydrogen sulfide and the liquid caustic soda, the tail gas reaches the tower top and flows to the rear absorption tower through an air conveying pipe, then, the tail gas flows out of the tower top of the rear absorption tower and flows downwards, at the moment, because the nozzles of the second spraying layer are upward, the direction of the sprayed liquid caustic soda is still opposite, after tail gas passes through the second layer that sprays, moisture in the defroster in the back absorption tower absorbs tail gas, and tail gas after the purification is from gas outlet discharge back absorption tower afterwards.

Preferably, the side wall of the filter cavity is provided with a plurality of filter holes, and one-way filter screens are arranged in the filter holes; the liquid inlet pipe is arranged in the filter cavity as a plurality of liquid spraying pipes, and the side walls of the liquid spraying pipes are provided with liquid spraying devices close to the inner wall of the filter cavity.

The side wall of the filter cavity is provided with a plurality of filter holes, a one-way filter screen is arranged in the filter holes, the rapid filtration can be realized under the action of centrifugal force and gravity, and the inventor finds that a plurality of solid impurities and precipitated sodium sulfide crystals in secondary alkali liquor are more, and the solid impurities and the sodium sulfide crystals can attach to the one-way filter screen during the filtration to block the meshes of the one-way filter screen, thereby influencing the filtration of the secondary alkali liquor in the filter cavity, therefore, the utility model divides the secondary alkali liquor into a plurality of liquid spraying pipes after the liquid inlet pipe enters the filter cavity, and is provided with a liquid spraying device at the side wall of the liquid spraying pipe close to the inner wall of the filter cavity, when the secondary alkali liquor enters the filter cavity through the liquid inlet pipe, the secondary alkali liquor can be divided into a plurality of liquid spraying pipes and sprayed out from the liquid spraying device, during the filtration, as the secondary alkali liquor sprayed out from the liquid spraying device can give an, therefore, solid impurities and sodium sulfide crystals attached to the unidirectional filter screen can be washed away, the unidirectional filter screen is prevented from being blocked, the filtering efficiency is further increased, and the filtering effect is better. And because the filter cavity is in a rotating state and the liquid spraying pipe is in a static state during filtering, the liquid spraying device on the liquid spraying pipe can wash the one-way filter screen in the whole filter cavity without dead angles.

Preferably, the liquid spraying device is of a T-shaped structure comprising a connecting pipe and a liquid spraying column, the connecting pipe is communicated with the liquid spraying pipe, and the liquid spraying column is provided with a liquid spraying port, the liquid spraying direction of which is opposite to the rotation direction of the filter cavity.

For the T shape structure including connecting pipe and hydrojet post on the hydrojet device, on the hydrojet post was located to the hydrojet mouth, when save material, also made the hydrojet area maximize to, the hydrojet direction and the filter chamber direction of rotation of hydrojet mouth are opposite, consequently when the filter chamber spin filtration, can more effectually play the effect that the hydrojet washed to one-way filter screen, and solid impurity and sodium sulfide crystallization can be washed away by more easily, improve the filter effect.

Preferably, still be connected with the stirring rake that the opening upwards is the V-arrangement structure on the lateral wall of filter chamber, the stirring rake includes connecting rod and puddler, the connecting rod is connected with the lateral wall of filter chamber, and its upper portion be equipped with can be in the spout gliding location slider with be located the spout on with puddler cross-section complex regulation hole, the puddler is inserted and is located in the regulation hole to fix through inserting the locating hole that link up the setting with the location slider, and the location slider is curved "worker" shape structure for upper and lower surface, its length is greater than the length in regulation hole.

The utility model discloses still be connected with the stirring rake on the lateral wall of filter chamber, and the stirring rake is the ascending V-arrangement structure of opening, when the filter chamber is rotatory, the stirring rake also can follow the rotation, and the stirring rake also can compromise more regions for secondary alkali lye concentration after the filtration purification keeps even in secondary alkali lye filters stirred tank. Wherein, the stirring rake includes connecting rod and puddler, when installing the use, earlier slide to one side of spout with the location slider on connecting rod upper portion, then insert the puddler and locate in the regulation hole, insert the locating hole on the puddler along the spout with the location slider again, be used for fixing the puddler to the connecting rod on, and, be equipped with a plurality of locating holes on the puddler, therefore, the relative position of puddler and connecting rod can be adjusted in inserting different locating holes according to the location slider, when using, can be according to the concentration of secondary alkali lye, adjust the upper and lower position of puddler, make the puddler can stir the secondary alkali lye of different regions, guarantee the even of secondary alkali lye concentration. And the upper surface and the lower surface of the positioning slide block are both arc-shaped I-shaped structures, so that the positioning slide block can be better matched with the sliding groove and can be firmly fixed in the sliding groove without sliding, and the length of the positioning slide block is greater than that of the adjusting hole, so that a part of the positioning slide block is exposed out of the positioning hole for fixing after being inserted into the positioning hole.

Preferably, the first liquid caustic soda outlet arranged at the bottom of the first liquid caustic soda layer is communicated with a first spraying port pipeline on the side wall of the first spraying layer through a first circulating valve and a first circulating pump; and a second liquid caustic soda outlet arranged at the bottom of the second liquid caustic soda layer is respectively communicated with a second spraying port on the side wall of the second spraying layer and a front absorption tower pipeline through a second circulating valve and a second circulating pump.

The utility model discloses in, be arranged in also through the pipeline intercommunication between the second circulating pump of back absorption tower liquid caustic soda circulation and the preceding absorption tower, this is because hydrogen sulfide content satisfies the demands in the tail gas after guaranteeing to handle through back absorption tower, use for new liquid caustic soda in the second liquid caustic soda layer, and, after the absorption tower absorbs before the process, hydrogen sulfide content has greatly reduced in the tail gas of absorption tower after getting into, consequently, liquid caustic soda in the second liquid caustic soda layer still has great hydrogen sulfide absorption capacity after using, therefore when needing, accessible second circulating pump squeezes into first liquid caustic soda layer with the liquid caustic soda in the second liquid caustic soda layer, and squeeze into new liquid caustic soda in the second liquid caustic soda layer, the hydrogen sulfide absorption effect of whole device has both been guaranteed like this, make full use of liquid caustic soda, and therefore, the cost is reduced, the structure pipeline of whole device sets up more rationally.

Preferably, the outlets of the first circulating pump and the second circulating pump are also communicated with the mother liquor tank through mother liquor pipelines.

When needs maintenance or change liquid caustic soda, can put in the mother liquor cistern of beating other positions through the mother liquor pipeline with the liquid caustic soda in first liquid caustic soda layer and the second liquid caustic soda layer through first circulating pump and second circulating pump.

Preferably, the air inlet is communicated with a dirty air gallery pipeline through a booster fan, and a dirty air inserting door plate is arranged between the booster fan and the dirty air gallery; the air outlet is communicated with a clean air pipeline, and a clean air inserting door plate is arranged between the air outlet and the clean air pipeline.

The booster fan is used for absorbing tail gas by pressing the tail gas containing hydrogen sulfide in the dirty gas air gallery into the front absorption tower, so that the tail gas flowing power is provided, the tail gas can be controlled to enter and exit by opening and closing the dirty gas inserting door plate, and the booster fan is more flexible to use and maintain; the tail gas after purification treatment enters the clean air duct through the pipeline for subsequent treatment or discharge, and the inlet and outlet of the tail gas after purification can be controlled by opening and closing the clean air plug door plate.

Preferably, the bottom of the secondary alkali liquor filtering and stirring kettle is communicated with a front absorption tower through a secondary alkali liquor conveying pipe positioned on the upper side wall of the first alkali liquor layer, and a new alkali liquor feeding pipe is communicated with the upper side wall of the rear absorption tower positioned on the second alkali liquor layer.

Because the liquid caustic soda in the first liquid caustic soda layer need not new liquid caustic soda, consequently, the secondary alkali lye after the filtration evolution who stores in secondary alkali lye filters stirred tank can get into first liquid caustic soda layer through it, and new liquid caustic soda then gets into the second liquid caustic soda layer through new alkali lye inlet pipe, and this kind of setting makes liquid caustic soda can furthest be utilized, and can guarantee simultaneously that back absorption tower tail gas treatment effect is good.

Preferably, the bottoms of the front absorption tower and the rear absorption tower are both provided with sewage outlets.

The drain can divide liquid completely to drain in preceding absorption tower and the back absorption tower, makes things convenient for maintenance.

Therefore, the utility model discloses following beneficial effect has: (1) the secondary alkali liquor generated in the production process is used for absorbing hydrogen sulfide by arranging the secondary alkali liquor filtering stirring kettle, and the secondary alkali liquor is purified by arranging the filter cavity in the secondary alkali liquor filtering stirring kettle, so that the influence of solid impurities or crystallized sodium sulfide on the continuous absorptivity of the hydrogen sulfide gas when the secondary alkali liquor absorbs the hydrogen sulfide gas is prevented, and the absorption effect and efficiency are improved; (2) a liquid spraying device is arranged in the filter cavity to wash the one-way filter screen, so that the filter cavity can better filter solid impurities in the secondary alkali liquor or crystallized and separated sodium sulfide to purify the secondary alkali liquor; (3) through the synergistic effect of the front absorption tower and the rear absorption tower, the pipelines are reasonably distributed, the tail gas treatment effect can be ensured while alkali liquor is reasonably distributed and used, and the production cost is effectively reduced; (4) when the stirring rod is used, the upper position and the lower position of the stirring rod can be adjusted according to the concentration of the secondary alkali liquor, so that the stirring rod can stir the secondary alkali liquor in different areas, and the uniformity of the concentration of the secondary alkali liquor is ensured; (5) the utility model discloses equipment structure is simple, and convenient operation saves production area, is fit for the industrial use.

Drawings

Fig. 1 is a schematic view of the connection structure of the present invention.

Fig. 2 is a schematic structural view of the front absorption tower of the present invention.

Fig. 3 is a schematic structural view of the rear absorption tower of the present invention.

FIG. 4 is a schematic view of the structure of the secondary alkali liquor filtering stirring kettle of the present invention.

Fig. 5 is a schematic diagram of the structure in the filter chamber of the present invention.

Fig. 6 is a schematic structural view of the liquid spraying device of the present invention.

Fig. 7 is a schematic side view of the stirring paddle of the present invention.

Fig. 8 is a schematic view of the upper surface structure of the connecting rod of the present invention.

Fig. 9 is a schematic view of the cross-sectional structure of the connecting rod of the present invention.

In the figure: a front absorption tower 1, a first spraying layer 111, a first spraying port 112, a packing layer 113, a rear absorption tower 2, a second spraying layer 211, a second spraying port 212, a gas pipe 3, a demister 4, a first liquid caustic layer 5, a first liquid caustic outlet 51, a first circulating valve 52, a first circulating pump 53, a gas inlet 6, a second liquid caustic layer 7, a second liquid caustic outlet 71, a second circulating valve 72, a second circulating pump 73, a third circulating valve 74, a gas outlet 8, a booster fan 9, a dirty gas gallery 10, a dirty gas gate plate 11, a clean gas pipeline 12, a clean gas gate plate 13, an overflow port 14, a secondary alkali liquor conveying pipe 15, a new alkali liquor inlet pipe 16, a mother liquor pipeline 17, a sewage discharge port 18, a liquid level meter 19, a gas inlet flow meter 20, a gas outlet flow meter 21, a square manhole 22, a pressure meter 23, a secondary alkali liquor filtering kettle 31, a filtering cavity 32, a motor 33, a liquid inlet pipe 34 and a filtering hole 35, one-way filter screen 351, hydrojet pipe 36, hydrojet device 37, connecting pipe 371, hydrojet post 372, hydrojet mouth 373, stirring rake 38, connecting rod 381, puddler 382, spout 383, location slider 384, locating hole 385, regulation hole 386, feed liquor pump 39, pH meter 310, inlet tube 311.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Example (b): as shown in figure 1, a hydrogen sulfide tail gas absorption system comprises a secondary alkali liquor filtering and stirring kettle 31, a front absorption tower 1 and a rear absorption tower 2 which are sequentially connected, wherein the bottom of the secondary alkali liquor filtering and stirring kettle 31 is communicated with the front absorption tower 1 through a secondary alkali liquor conveying pipe 15 positioned on the upper side wall of a first alkali liquor layer 5. As shown in FIG. 4, the bottom of the secondary alkali liquor filtering and stirring kettle 31 is further provided with a pH meter 310, the top of the secondary alkali liquor filtering and stirring kettle 31 is provided with a water inlet pipe 311, the interior of the secondary alkali liquor filtering and stirring kettle 31 is provided with a filtering cavity 32, the bottom of the filter cavity 32 is connected with a motor 33 arranged at the bottom of the secondary alkali liquor filtering and stirring kettle 31, the side wall of the filter cavity 32 is provided with a plurality of filter holes 35, a one-way filter screen 351 is arranged in the filter hole 35, a liquid inlet pipe 34 penetrates through the top of the filter cavity 32, a liquid inlet pump 39 is arranged on the liquid inlet pipe 34, and as shown in fig. 5-6, the liquid inlet pipe 34 is divided into a plurality of liquid spray pipes 36 in the filter chamber 332, a liquid spraying device 37 is arranged on the side wall of the liquid spraying pipe 36 close to the inner wall of the filter cavity 32, the liquid spraying device 37 is of a T-shaped structure comprising a connecting pipe 371 and a liquid spraying column 372, the connecting pipe 371 is communicated with the liquid spraying pipe 36, and the liquid spraying column 372 is provided with a liquid spraying port 373, the liquid spraying direction of which is opposite to the rotation direction of the filter cavity 32; the outer side wall of the filter cavity 32 is further connected with a stirring paddle 38 which is opened upwards and has a V-shaped structure, as shown in fig. 4 and 7, the stirring paddle 38 comprises a connecting rod 381 and a stirring rod 382, the connecting rod 381 is connected with the side wall of the filter cavity 32, and as shown in fig. 8-9, a positioning slide block 384 which can slide in the sliding groove 383 and an adjusting hole 386 which is positioned on the sliding groove 383 and is matched with the cross section of the stirring rod 382 are arranged at the upper part of the connecting rod 38, the positioning slide block 384 is an arc-shaped structure with the upper and lower surfaces, the length of the positioning slide block 384 is greater than that of the adjusting hole 386, and the stirring rod 382 is inserted into the adjusting hole 386 and is fixed by inserting the positioning slide block 384 into a positioning hole.

As shown in fig. 1-3, a front absorption tower 1 and a rear absorption tower 2 are connected through a gas pipe 3 arranged at the top of the tower, the side wall of the top of the front absorption tower 1 is provided with a pressure gauge 23, the front absorption tower 1 is internally provided with a demister 4, a first spraying layer 111 with a downward nozzle, a packing layer 113 and a first liquid alkali layer 5 from top to bottom in sequence, the upper side wall of the first liquid alkali layer 5 is communicated with a secondary alkali liquor conveying pipe 15, and the side wall between the packing layer 113 and the first liquid caustic soda layer 5 is provided with an air inlet 6, the air inlet 6 is communicated with a dirty air gallery 10 through a booster fan 9, a dirty gas inserting door plate 11 is arranged between the booster fan 9 and the dirty gas air gallery 10, an air inlet flow meter 20 is arranged on a pipeline between the booster fan 9 and the air inlet 6, and a first liquid caustic soda outlet 51 arranged at the bottom of the first liquid caustic soda layer 5 is communicated with a first spraying port 112 on the side wall of the first spraying layer 111 through a first circulating valve 52 and a first circulating pump 53; a second spraying layer 211 demister 4 with upward nozzles and a second liquid caustic soda layer 7 are sequentially arranged in the rear absorption tower 2 from top to bottom, the upper side wall of the second liquid alkali layer 7 is communicated with a new alkali liquid feeding pipe 16, the side wall between the demister 4 of the rear absorption tower 2 and the second liquid alkali layer 7 is provided with an air outlet 8, the air outlet 8 is communicated with a clean air pipeline 12 through a pipeline, a clean gas plug-in door plate 13 and a gas outlet flow meter 21 are arranged on a pipeline between the gas outlet 8 and the clean gas wind pipeline 12, a second liquid caustic soda outlet 71 arranged at the bottom of the second liquid caustic soda layer 7 is respectively communicated with a second spraying port 212 on the side wall of the second spraying layer 211 and a pipeline of the front absorption tower 1 through a second circulating valve 72 and a second circulating pump 73, and a third circulating valve 74 is further provided on the pipe between the second circulating pump 73 and the front absorption tower 1, meanwhile, the outlets of the first circulating pump 53 and the second circulating pump 73 are also communicated with the mother liquor tank through a mother liquor pipeline 17; as shown in fig. 2 and 3, overflow ports 14 are formed in the upper side walls of the first liquid caustic soda layer 5 and the second liquid caustic soda layer 7, and liquid level meters 19 are arranged at the bottoms of the first liquid caustic soda layer 5 and the second liquid caustic soda layer 7; the bottom of the front absorption tower 1 and the bottom of the rear absorption tower 2 are both provided with a sewage draining outlet 18, and the side surfaces of the front absorption tower 1 and the rear absorption tower 2 are both provided with a square manhole 22.

The utility model discloses when using, open feed liquor pump 39, the secondary alkali lye of retrieving passes through feed liquor pipe 34 and enters into filter chamber 32 at first, at this moment, locate the motor 33 start-up of secondary alkali lye filtration stirred tank 31 bottom, motor 33 drives filter chamber 32 rotation filtration, simultaneously, secondary alkali lye also from hydrojet device 37 on spout liquid mouth blowout, and the hydrojet direction is opposite with filter chamber 32 rotation direction, be used for washing the one-way filter screen 351 in the filtration pore 35, prevent that solid impurity or crystallization from appearing the sodium sulfide and depend on one-way filter screen; when the filter chamber 32 is rotated, the stirring paddle 38 is also rotated together to stir the secondary alkali liquor after filtration and purification in the secondary alkali liquor filtration stirring kettle 31, and when in use, the stirring paddle 38 can adjust the upper and lower positions of the stirring rod 382 according to the concentration of the secondary alkali liquor, so that the stirring rod 382 can stir the secondary alkali liquor in different areas, and the uniformity of the concentration of the secondary alkali liquor is ensured. After filtering completely and the stirring, adopt pH meter 310 to detect the pH value of secondary alkali lye after the filtration purification, when pH value not reach standard, the inlet tube 311 that the accessible secondary alkali lye filters the setting at stirred tank 31 top is toward interior adding water or adding alkali for adjust the pH value of filtering secondary alkali lye after evolving, the back of finishing adjusting, the continuous stirring is with reserve.

Then the booster fan 9 and the dirty air inserting door plate 11 are opened, the tail gas containing hydrogen sulfide in the dirty air duct 10 is led into the front absorption tower 1, after entering the front absorption tower 1, the tail gas containing hydrogen sulfide flows upwards, firstly, the tail gas passes through the packing layer 113 for first-step absorption, then the tail gas continuously rises, meanwhile, the first circulating valve 52 and the first circulating pump 53 are opened, the first spraying layer 211 sprays liquid caustic soda downwards, the spraying direction is opposite to the tail gas flowing direction, the hydrogen sulfide in the tail gas is further absorbed, then, after the tail gas passes through the demister 4, the moisture in the tail gas is absorbed, the tail gas is transmitted to the rear absorption tower 2 through the gas pipe 3, in the absorption tower 2, the tail gas flows downwards from the top of the tower, the hydrogen sulfide is absorbed through the second spraying layer 211 with an upward nozzle, the moisture is absorbed by the demister 4, the purified tail gas is discharged out of the rear absorption tower 2 through the gas outlet 8, and enters the clean air duct. When the liquid caustic soda in first liquid caustic soda layer 5 and the second liquid caustic soda layer 7 needs to be changed, new liquid caustic soda can get into second liquid caustic soda layer 7 through new liquid caustic soda inlet pipe 16, secondary alkali liquor filters among the stirred tank 31 and filters the secondary alkali liquor accessible secondary alkali liquor conveyer pipe 15 after evolving and gets into first liquid caustic soda layer 5, and, the liquid caustic soda in second liquid caustic soda layer 7 also can be squeezed into the liquid caustic soda into and continue to use in first liquid caustic soda layer 5 through second circulating pump 73, pipeline design is reasonable, and under the condition of guaranteeing hydrogen sulfide absorption effect, the liquid caustic soda can obtain the utilization of maximize.

Claims (9)

1. A hydrogen sulfide tail gas absorption system is characterized by comprising a secondary alkali liquor filtering and stirring kettle (31), a front absorption tower (1) and a rear absorption tower (2) which are sequentially connected, wherein a filter cavity (32) connected with a bottom motor (33) is arranged inside the secondary alkali liquor filtering and stirring kettle (31), and a liquid inlet pipe (34) is communicated with the top of the filter cavity (32); preceding absorption tower (1) is interior from last to being equipped with down in proper order demister (4), the first downward spray layer (111) of spout, packing layer (113) and first liquid caustic soda layer (5), and be equipped with on the lateral wall between packing layer (113) and first liquid caustic soda layer (5) air inlet (6), be equipped with spout ascending second spray layer (211) demister (4) and second liquid caustic soda layer (7) from last to being equipped with down in proper order in back absorption tower (2), and be equipped with gas outlet (8) on the lateral wall between demister (4) and second liquid caustic soda layer (7), preceding absorption tower (1) is connected through gas-supply pipe (3) of locating the top of the tower with back absorption tower (2).

2. The hydrogen sulfide tail gas absorption system according to claim 1, wherein a plurality of filter holes (35) are formed in the side wall of the filter cavity (32), and a one-way filter screen (351) is arranged in each filter hole (35); the liquid inlet pipe (34) is arranged in the filter cavity (32) to form a plurality of liquid spraying pipes (36), and liquid spraying devices (37) are arranged on the side wall of each liquid spraying pipe (36) close to the inner wall of the filter cavity (32).

3. The hydrogen sulfide tail gas absorption system as claimed in claim 2, wherein the liquid spraying device (37) is a T-shaped structure comprising a connecting pipe (371) and a liquid spraying column (372), the connecting pipe (371) is communicated with the liquid spraying pipe (36), and the liquid spraying column (372) is provided with a liquid spraying port (373) with a liquid spraying direction opposite to the rotation direction of the filter chamber (32).

4. A hydrogen sulfide tail gas absorption system according to any one of claims 1 to 3, wherein the outer side wall of the filter chamber (32) is further connected with a stirring paddle (38) which is opened upwards and has a V-shaped structure, the stirring paddle (38) comprises a connecting rod (381) and a stirring rod (382), the connecting rod (381) is connected with the side wall of the filter chamber (32), and the upper part of the connecting rod is provided with a positioning slide block (384) which can slide in the sliding groove (383) and an adjusting hole (386) which is positioned on the sliding groove (383) and is matched with the cross section of the stirring rod (382), the stirring rod (382) is inserted into the adjusting hole (386) and is fixed by inserting the positioning slide block (384) into a positioning hole (385) which is arranged through, and the positioning slide block (384) is an "i" shaped structure whose upper and lower surfaces are both arc-shaped, and the length of the positioning slide block (384) is.

5. The hydrogen sulfide tail gas absorption system according to any one of claims 1 to 3, wherein a first caustic soda outlet (51) arranged at the bottom of the first caustic soda layer (5) is in pipeline communication with a first spraying port (112) on the side wall of the first spraying layer (111) through a first circulating valve (52) and a first circulating pump (53); and a second liquid caustic soda outlet (71) arranged at the bottom of the second liquid caustic soda layer (7) is respectively communicated with a second spraying port (212) on the side wall of the second spraying layer (211) and a pipeline of the front absorption tower (1) through a second circulating valve (72) and a second circulating pump (73).

6. A hydrogen sulphide tail gas absorption system according to claim 5 wherein the outlets of the first (53) and second (73) circulation pumps are also in communication with a mother liquor tank via a mother liquor conduit (17).

7. The hydrogen sulfide tail gas absorption system according to any one of claims 1 to 3, wherein the gas inlet (6) is communicated with a dirty gas air gallery (10) through a booster fan (9), and a dirty gas door inserting plate (11) is arranged between the booster fan (9) and the dirty gas air gallery (10); the air outlet (8) is communicated with a clean air duct (12) through a pipeline, and a clean air inserting door plate (13) is arranged between the air outlet (8) and the clean air duct (12).

8. A hydrogen sulfide tail gas absorption system as claimed in any one of claims 1 to 3, wherein the bottom of the secondary alkali liquid filtering stirring kettle (31) is communicated with the front absorption tower (1) through a secondary alkali liquid conveying pipe (15) positioned on the upper side wall of the first liquid alkali layer (5), and the upper side wall of the rear absorption tower (2) positioned on the second liquid alkali layer (7) is communicated with a new alkali liquid feeding pipe (16).

9. The hydrogen sulfide tail gas absorption system as claimed in claim 5, wherein the bottoms of the front absorption tower (1) and the rear absorption tower (2) are provided with sewage outlets (18).

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