Lye circulation tank structure

Abstract

The application discloses a kind of lye circulating tank structures, including circulating tank body, top end of circulating tank body is equipped with top cover, lye circulating outlet pipe is provided on circulating tank body, the inner end of lye circulating outlet pipe is covered with isolation structure, top cover is penetrated with lye backflow pipe, liquid injection pipe and scrubbing tower inlet pipe.The spiral spray head of the present application is provided, so that the lye can be fully contacted with the chlorine-containing gas in the circulating tank body and reacted, thereby avoiding the risk of chlorine overflow, by making the bottom end of the liquid injection pipe face the isolation structure, so that the mixed liquid of fresh lye and production water can flush the inner end of the isolation structure and the lye circulating outlet pipe, eliminating the plugging crystalline of the lye circulating outlet pipe.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of circulating tank, and particularly relates to a lye circulating tank structure. BACKGROUND

[0002] At present, the chlorine-containing tail gas washing system basically adopts alkali washing absorption treatment. The lye circulating tank is one of important devices in the chlorine-containing tail gas washing system, and the chlorine in the tail gas can be absorbed by the lye by using the gas inlet pipeline to pass into the lye, so that the purpose of treating the tail gas is achieved. The commonly used lye circulating tank is combined with the fresh lye made of 30% sodium hydroxide solution and the production water pipeline outside the lye circulating tank into a pipeline, and the mutual isolation and connection between the pipelines are realized through the valve, and then the pipeline is passed into the lye circulating tank.

[0003] The patent CN201320278752.5 discloses a hydrogen chloride tail gas circulating absorption device, which comprises a hydrochloric acid absorption tower, a lye absorption tower, a tail gas inlet pipe, a hydrochloric acid concentration control device, a hydrochloric acid qualified product tank, a hydrochloric acid circulating tank, a hydrochloric acid circulating pump, a lye circulating tank, a lye circulating pump and an induced draft fan. The hydrogen chloride tail gas is discharged after the first-stage acid absorption, the second-stage acid absorption and the third-stage alkali absorption. The first-stage absorption and the second-stage absorption both use water as the absorption liquid, and the third-stage absorption uses the liquid lye (sodium hydroxide) solution with a mass concentration of 10%. The present application uses water to circulate and absorb the hydrogen chloride gas in the chlorinated tail gas to generate the by-product hydrochloric acid for sale. In order to ensure the absorption effect, the lye circulating tank can be provided with a pH meter to automatically alarm when the lye content is low, so that the lye can be replaced in time. The absorption device of the present application has the advantages of simple structure, ordinary material, convenient operation, low operation cost and good absorption effect.

[0004] In the actual use process of the chlorine-containing tail gas, the chlorine gas aggregation in the gas phase space of the circulating tank and the lye crystallization in the local part of the circulating tank outlet pipe frequently occur, so that the chlorine gas overflow risk of the lye circulating tank occurs, and the circulating tank outlet pipe is blocked due to the lye crystallization in the local part of the circulating tank outlet pipe.

[0005] The information disclosed in this Background section is only for the purpose of increasing the understanding of the background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms prior art that is already known in this field. SUMMARY

[0006] The purpose of the present application is to provide a lye circulating tank structure to solve the above problems in the prior art.

[0007] In order to achieve the above object, the alkali liquor circulating tank structure provided by the application comprises a circulating tank body, a top cover is arranged at the top end of the circulating tank body, a cavity is arranged in the circulating tank body, an alkali liquor circulating outlet pipe is connected to the bottom edge of the front end of the circulating tank body, an isolation structure is arranged on the inner end of the alkali liquor circulating outlet pipe, the isolation structure is composed of a plurality of grid plates, an alkali liquor backflow pipe, a liquid injection pipe and a washing tower air inlet pipe are vertically penetrated through the top cover, the bottom end of the alkali liquor backflow pipe is connected with a plurality of branch pipes, a plurality of spiral nozzles are arranged on the branch pipes, and the bottom end of the liquid injection pipe is located directly above the isolation structure.

[0008] In the technical scheme of the application, the isolation structure is provided with a fixed frame, the fixed frame is fixed by a plurality of rod members, a plurality of grid plates are fixed on the left side, the right side, the back side and the top side of the fixed frame respectively, the rod members are fixed between the edges of adjacent two grid plates, and the isolation structure isolates the inner end of the alkali liquor circulating outlet pipe from the inside of the cavity.

[0009] In the technical scheme of the application, the branch pipes are hollow tubular structures and are horizontally arranged in the cavity, the branch pipes and the bottom end of the alkali liquor backflow pipe are connected through pipelines, the spiral nozzles are threadedly connected to the bottom surface of the branch pipes, and the nozzle direction of the spiral nozzles is downward.

[0010] In the technical scheme of the application, the top end of the liquid injection pipe is connected with a fresh alkali liquor pipe and a production water pipe, and control valves are arranged on the fresh alkali liquor pipe and the production water pipe.

[0011] In the technical scheme of the application, the bottom end of the liquid injection pipe is fixed with a dispersing disc, the inside of the dispersing disc is hollow, the bottom end of the liquid injection pipe is connected with a plurality of spray pipes, the spray pipes are communicated with the inside of the dispersing disc, and the nozzle direction of the spray pipes is toward the isolation structure.

[0012] In the technical scheme of the application, the bottom end of the washing tower air inlet pipe is connected with a plurality of distribution pipes, a plurality of air outlet pipes are connected to the peripheral surface of the distribution pipes, the air outlet pipes, the distribution pipes and the washing tower air inlet pipe are in communication, and a stop valve is arranged on the washing tower air inlet pipe.

[0013] In the technical scheme of the application, the inside of the cavity is fixed with a plurality of battens, the battens are vertically arranged in the cavity, the first end and the last end of the battens are fixed to the inner walls of the front side and the back side of the cavity respectively, and the distribution pipes are lapped on the battens.

[0014] The outer side of the lye reflux pipe, the liquid injection pipe and the washing tower gas inlet pipe is provided with a sealing element, which is installed at the position where the lye reflux pipe, the liquid injection pipe and the washing tower gas inlet pipe penetrate the top cover

[0015] In the technical scheme of the present application, the outer side of the lye reflux pipe, the liquid injection pipe and the washing tower gas inlet pipe is provided with a sealing element, which is installed at the position where the lye reflux pipe, the liquid injection pipe and the washing tower gas inlet pipe penetrate the top cover.

[0016] In the technical scheme of the present application, the sealing element is composed of a pair of end plates respectively attached to the top and bottom surfaces of the top cover, a sleeve column is arranged on the outer end surface of the end plate, a through cavity is formed in the sleeve column, an annular groove is formed in the inner wall of the through cavity, a sealing ring is arranged in the annular groove, a sealing plate is arranged between the end plate and the surface of the top cover, and the lye reflux pipe, the liquid injection pipe and the washing tower gas inlet pipe all penetrate the sleeve column.

[0017] In summary, due to the adoption of the above technical scheme, the present application has the following advantages:

[0018] 1. In the present application, the end of the lye reflux pipe is connected with a branch pipe, and a spiral nozzle is arranged on the branch pipe. When the reflux lye flows into the circulating tank through the lye reflux pipe, the reflux lye is tangent to and collides with the spiral surface of the spiral nozzle, and then becomes a small liquid bead and is sprayed to form a mist. As a result, the lye can fully contact with the chlorine-containing gas in the gas phase space in the circulating tank and react, thereby avoiding the risk of chlorine overflow in the circulating tank.

[0019] 2. In the present application, the bottom end of the liquid injection pipe is directed towards the isolation structure. When the mixed solution of fresh lye and production water is injected into the circulating tank, it will flush the isolation structure. Under the action of gravity and temperature, the mixed liquid flushes the isolation structure and the inner end of the lye circulation outlet pipe, thereby eliminating the blocking crystalline material of the lye circulation outlet pipe.

[0020] 3. In the present application, the reflux lye is sprayed into the circulating tank through the spiral nozzle, which prevents the reflux lye from directly impacting the bottom plate of the circulating tank, thereby avoiding the situation that the bottom plate of the circulating tank is broken due to the impact of the lye reflux.

[0021] 4. In the present application, the isolation structure arranged at the inner end position of the lye circulation outlet pipe can block the impurities in the lye outside the lye circulation outlet pipe, thereby avoiding that the impurities cause the lye circulation outlet pipe to be blocked. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0023] Figure 2 is an overall structural exploded view of the present application;

[0024] Figure 3 is a top view of the circulating groove body in the present application;

[0025] Figure 4 is an exploded view of the isolation structure in the present application;

[0026] Figure 5 is a structural view of the lye reflux pipe in the present application;

[0027] Figure 6 is a structural view of the liquid injection pipe in the present application;

[0028] Figure 7 is a bottom structural view of the dispersing disc in the present application;

[0029] Figure 8 is a structural view of the washing tower air inlet pipe in the present application;

[0030] Figure 9 is a structural view of the sealing element in the present application.

[0031] Explanation of reference signs:

[0032] 1 - circulating groove body; 11 - cavity; 12 - lye circulating outlet pipe; 13 - isolation structure; 131 - fixed frame; 132 - grating plate; 14 - batten;

[0033] 2 - top cover;

[0034] 3 - lye reflux pipe; 31 - branch pipe; 32 - spiral spray head;

[0035] 4 - liquid injection pipe; 41 - dispersing disc; 411 - spray pipe; 42 - fresh lye pipe; 43 - production water pipe; 44 - control valve;

[0036] 5 - washing tower air inlet pipe; 51 - distribution pipe; 511 - air outlet pipe; 52 - stop valve;

[0037] 6 - sealing element; 61 - end plate; 611 - sleeve column; 612 - through cavity; 613 - ring groove; 62 - sealing ring; 63 - sealing plate. DETAILED DESCRIPTION

[0038] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments.

[0039] Unless specifically stated otherwise, throughout the specification and the claims, the term "comprising" or variations such as "comprise" or "comprises" will be understood to imply the inclusion of a stated element or group of elements but not the exclusion of any other element or group of elements.

[0040] Referring to Figures 1-9 The alkali liquor circulating tank structure of the present application comprises a circulating tank body 1, a top cover 2 is installed at the top end of the circulating tank body 1, a cavity 11 is formed in the circulating tank body 1, alkali liquor is contained in the cavity 11, an alkali liquor circulating outlet pipe 12 is connected at the bottom edge of the front end of the circulating tank body 1, an isolation structure 13 is arranged at the inner end of the alkali liquor circulating outlet pipe 12, the isolation structure 13 is composed of a plurality of grating plates 132, a fixed frame 131 is arranged in the isolation structure 13, the fixed frame 131 is fixed by a plurality of rod members, the plurality of grating plates 132 are respectively fixed at the left side, the right side, the back side and the top side of the fixed frame 131, the rod members are fixed between the edges of adjacent two grating plates 132, so that the isolation structure 13 formed by the plurality of grating plates 132 and the fixed frame 131 isolates the inner end of the alkali liquor circulating outlet pipe 12 from the inside of the cavity 11, so that the isolation structure 13 can block the impurities in the alkali liquor outside the alkali liquor circulating outlet pipe 12, avoiding that the impurities cause the alkali liquor circulating outlet pipe 12 to be blocked.

[0041] In the present application, the top cover 2 is penetrated by an alkali liquor return pipe 3, a liquid injection pipe 4 and a washing tower air inlet pipe 5, the alkali liquor return pipe 3, the liquid injection pipe 4 and the washing tower air inlet pipe 5 all vertically penetrate the top cover 2. The alkali liquor return pipe 3 is used to inject the refluxing alkali liquor into the circulating tank body 1. The top end of the liquid injection pipe 4 is connected with a fresh alkali liquor pipe 42 and a production water pipe 43, so that the mixed liquid of the fresh alkali liquor pipe 42 and the production water pipe 43 can be injected into the circulating tank body 1 to supplement the loss of the alkali liquor in the circulating tank body 1. The washing tower air inlet pipe 5 is used to introduce the chlorine-containing tail gas, so that the chlorine-containing tail gas can be injected into the circulating tank body 1 to react with the alkali liquor, achieving the purpose of removing chlorine from the tail gas.

[0042] Specifically, the bottom end of the alkali liquor return pipe 3 is connected with a plurality of branch pipes 31, a plurality of spiral nozzles 32 are installed on the branch pipes 31, the bottom end of the liquid injection pipe 4 is located directly above the isolation structure 13, the branch pipes 31 are hollow tubular structures and are horizontally arranged in the cavity 11, the branch pipes 31 and the bottom end of the alkali liquor return pipe 3 are connected by pipelines, the spiral nozzles 32 are threadedly connected to the bottom surface of the branch pipes 31, the nozzle direction of the spiral nozzles 32 is downward, when the refluxing alkali liquor is injected from the alkali liquor return pipe 3 into the circulating tank body 1, the refluxing alkali liquor will enter the branch pipes 31 and be sprayed outward from the spiral nozzles 32, so that the refluxing alkali liquor will be tangent to and collide with the spiral surfaces of the continuously decreasing spiral nozzles 32 after the refluxing alkali liquor and the continuously decreasing spiral nozzles 32, and then the refluxing alkali liquor will be sprayed as tiny liquid beads to form a mist, so that the alkali liquor can fully contact with the chlorine-containing gas in the gas phase space in the circulating tank body 1, thereby avoiding the risk of chlorine gas overflowing in the circulating tank body 1.

[0043] Further, the fresh lye pipe 42 and the production water pipe 43 are both provided with control valves 44, and the liquid flow of the fresh lye pipe 42 and the production water pipe 43 can be controlled respectively by controlling the control valves 44, so as to control the flow of the fresh lye and the production water into the circulating tank 1.

[0044] In addition, the bottom end of the liquid injection pipe 4 is fixed with a dispersion disc 41, the inside of the dispersion disc 41 is hollow, the bottom end of the liquid injection pipe 4 is connected with a plurality of spray pipes 411, the spray pipes 411 are communicated with the inside of the dispersion disc 41, and the nozzle direction of the spray pipes 411 is towards the isolation structure 13. When the mixed liquid of the fresh lye and the production water enters into the circulating tank 1 through the liquid injection pipe 4, the mixed liquid will enter into the dispersion disc 41 and be sprayed from the spray pipes 411 to the isolation structure 13 and the inner end of the lye circulating outlet pipe 12, so that the mixed solution of the fresh lye and the production water will flush the isolation structure 13 when being injected into the circulating tank 1, and the mixed liquid will flush the isolation structure 13 and the inner end of the lye circulating outlet pipe 12 under the action of gravity and temperature, so as to eliminate the clogging crystalline substances of the lye circulating outlet pipe 12.

[0045] It is worth noting that the bottom end of the washing tower air inlet pipe 5 is connected with a plurality of distribution pipes 51, a plurality of air outlet pipes 511 are connected on the peripheral surface of the distribution pipes 51, the air outlet pipes 511, the distribution pipes 51 and the washing tower air inlet pipe 5 are communicated, so that the chlorine gas entering into the circulating tank 1 through the washing tower air inlet pipe 5 can enter into the circulating tank 1 uniformly under the action of the distribution pipes 51 and the air outlet pipes 511, so that the chlorine-containing tail gas can be fully contacted with the lye, and the purification of the gas is accelerated. The washing tower air inlet pipe 5 is provided with a stop valve 52, and the purpose of controlling the gas into the circulating tank 1 can be achieved by controlling the stop valve 52.

[0046] It is worth noting that the inside of the cavity 11 is fixed with a plurality of battens 14, the battens 14 are longitudinally arranged in the cavity 11, the first end and the last end of the battens 14 are fixed on the inner walls of the front and rear sides of the cavity 11 respectively, and the distribution pipes 51 are overlapped on the battens 14, so that the battens 14 play a supporting role on the distribution pipes 51.

[0047] In the above scheme, the outer sides of the lye backflow pipe 3, the liquid injection pipe 4 and the washing tower air inlet pipe 5 are all provided with sealing members 6, the sealing members 6 are installed at the positions where the lye backflow pipe 3, the liquid injection pipe 4 and the washing tower air inlet pipe 5 penetrate through the top cover 2, so that the gaps between the lye backflow pipe 3, the liquid injection pipe 4 and the washing tower air inlet pipe 5 and the top cover 2 are covered by the sealing members 6, the purpose of sealing is achieved, and the leakage of chlorine gas is prevented.

[0048] Specifically, the sealing member 6 is composed of a pair of end plates 61 respectively attached to the top and bottom surfaces of the top cover 2, the outer end surface of the end plate 61 is provided with a sleeve column 611, the sleeve column 611 is provided with a through cavity 612, the inner wall of the through cavity 612 is provided with a ring groove 613, the ring groove 613 is provided with a sealing ring 62, the end plate 61 and the surface of the top cover 2 are provided with a sealing plate 63, the lye reflux pipe 3, the liquid injection pipe 4 and the scrubbing tower gas inlet pipe 5 all pass through the sleeve column 611, by placing the end plate 61 on the top and bottom of the top cover 2 and fixing the two end plates 61 by using bolts, the sealing member 6 can be clamped on the shell of the top cover 2, at this time, the sealing ring 62 plays the role of sealing the through cavity 612, and the sealing plate 63 plays the role of sealing between the top cover 2 and the end plate 61, so that the lye reflux pipe 3, the liquid injection pipe 4 and the scrubbing tower gas inlet pipe 5 can be kept in a sealed state with the top cover 2 under the action of the sealing member 6, preventing the leakage of chlorine gas in the circulating tank body 1.

[0049] Further, the top end of the top cover 2 is also provided with an exhaust pipe, so that the chlorine-containing tail gas introduced from the scrubbing tower gas inlet pipe 5 will be discharged outward from the exhaust pipe after being purified by the lye.

[0050] The working principle of the lye circulating tank structure of the present application is as follows: first, the recovered lye is introduced into the circulating tank body 1 from the lye reflux pipe 3, the reflux lye will enter the branch pipe 31 and be sprayed outward from the spiral nozzle 32, so that the reflux lye will be tangent to and collide with the spiral surface of the continuously decreasing spiral nozzle 32, and then be sprayed as tiny liquid beads to form a mist, so that the lye can fully contact with the chlorine-containing gas in the gas phase space in the circulating tank body 1, thereby avoiding the risk of chlorine gas overflow in the circulating tank body 1, then the fresh lye and production water are mixed and injected into the circulating tank body 1 through the liquid injection pipe 4 to replenish the lye in the circulating tank body 1, and the mixed liquid of fresh lye and production water is sprayed towards the isolation structure 13 and the inner end of the lye circulating outlet pipe 12 through the dispersion disc 41 and the spray pipe 411, so that the mixed solution of fresh lye and production water will flush the isolation structure 13 when injected into the circulating tank body 1, and eliminate the clogging crystalline material of the lye circulating outlet pipe 12, finally, the chlorine-containing tail gas is injected into the circulating tank body 1 through the scrubbing tower gas inlet pipe 5, so that the chlorine-containing tail gas can uniformly enter the circulating tank body 1 under the action of the distribution pipe 51 and the exhaust pipe 511, and the chlorine-containing tail gas can fully contact with the lye to accelerate the purification of the gas.

[0051] The foregoing description of specific exemplary embodiments of the application has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the application to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. It is intended that the scope of the application be limited not with this detailed description, but rather by the claims appended hereto.

Claims

1. A caustic liquor circulation tank structure comprising a circulation tank body (1), a top cover (2) is installed at the top end of the circulation tank body (1), characterized in that: The circulating groove (1) is provided with a cavity (11), the bottom edge of the front end of the circulating groove (1) is connected with a lye circulating outlet pipe (12), the inner end of the lye circulating outlet pipe (12) is covered with an isolation structure (13), the isolation structure (13) is composed of a plurality of grid plates (132), the top cover (2) is penetrated by a lye backflow pipe (3), a liquid injection pipe (4) and a washing tower air inlet pipe (5), the lye backflow pipe (3), the liquid injection pipe (4) and the washing tower air inlet pipe (5) all vertically penetrate the top cover (2), the bottom end of the lye backflow pipe (3) is connected with a plurality of branch pipes (31), a plurality of spiral nozzles (32) are installed on the branch pipes (31), the bottom end of the liquid injection pipe (4) is located directly above the isolation structure (13). The bottom end of the washing tower air inlet pipe (5) is connected with a plurality of distribution pipes (51), a plurality of air outlet pipes (511) are connected on the peripheral surface of the distribution pipes (51), the air outlet pipes (511), the distribution pipes (51) and the washing tower air inlet pipe (5) are in communication, a stop valve (52) is installed on the washing tower air inlet pipe (5). The inside of the cavity (11) is fixed by a plurality of battens (14), the battens (14) are longitudinally arranged in the cavity (11), the first end and the last end of the batten (14) are respectively fixed on the inner walls of the front and rear sides of the cavity (11), the distribution pipes (51) are overlapped on the battens (14). The outer sides of the lye backflow pipe (3), the liquid injection pipe (4) and the washing tower air inlet pipe (5) are all installed with sealing elements (6), the sealing elements (6) are installed at the penetration positions of the lye backflow pipe (3), the liquid injection pipe (4) and the washing tower air inlet pipe (5) from the top cover (2). The sealing element (6) is composed of a pair of end plates (61) which are respectively attached on the top and bottom surfaces of the top cover (2), a sleeve column (611) is arranged on the outer end surface of the end plate (61), a through cavity (612) is arranged in the sleeve column (611), a ring groove (613) is arranged on the inner wall of the through cavity (612), a sealing ring (62) is sleeved in the ring groove (613), a sealing plate (63) is arranged between the end plate (61) and the surface of the top cover (2), the lye backflow pipe (3), the liquid injection pipe (4) and the washing tower air inlet pipe (5) all pass through the sleeve column (611).

2. The caustic circulation tank structure according to claim 1, wherein: The isolation structure (13) is provided with a fixed frame (131), the fixed frame (131) is fixed by a plurality of rod members, a plurality of grid plates (132) are respectively fixed on the left side, the right side, the rear side and the top side of the fixed frame (131), the rod members are fixed between the edges of adjacent two grid plates (132), the isolation structure (13) separates the inner end of the lye circulating outlet pipe (12) from the inside of the cavity (11).

3. The caustic circulation tank structure according to claim 1, wherein: The branch pipe (31) is in hollow tubular structure and is transversely arranged in the cavity (11), a pipeline is connected between the branch pipe (31) and the bottom end of the lye return pipe (3), the spiral nozzle (32) is threadedly connected to the bottom surface of the branch pipe (31), and the nozzle direction of the spiral nozzle (32) is downward.

4. The caustic circulation tank structure according to claim 1, wherein: The top end of the liquid injection pipe (4) is connected with a fresh lye pipe (42) and a production water pipe (43), and the fresh lye pipe (42) and the production water pipe (43) are both provided with a control valve (44).

5. The caustic circulation tank structure according to claim 4, wherein: The bottom end of the liquid injection pipe (4) is fixed with a dispersion disc (41), the inside of the dispersion disc (41) is hollow, the bottom end of the liquid injection pipe (4) is connected with a plurality of spray pipes (411), the spray pipes (411) are communicated with the inside of the dispersion disc (41), and the nozzle direction of the spray pipes (411) is towards the isolation structure (13).

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