Hydrochloric acid tail gas absorption device

Abstract

The utility model provides a kind of hydrochloric acid tail gas absorption device, belong to hydrochloric acid preparation technical field.The hydrochloric acid tail gas absorption device includes: absorption tower, hydrochloric acid tail gas inlet pipe, acid liquid pump and gas external circulation pipe.Absorption tower has tower body;The top of tower body is provided with gas circulation interface, and its bottom is provided with drainage outlet;Tower body's inboard top near also is provided with shower nozzle;The outlet end of hydrochloric acid tail gas inlet pipe is located in the inboard lower part of tower body;First acid liquid pipe and second acid liquid pipe connected with acid liquid pump are respectively communicated with shower nozzle and drainage outlet;One end of gas external circulation pipe is communicated with gas circulation interface, and its other end is obliquely communicated with hydrochloric acid tail gas inlet pipe.Shower nozzle and hydrochloric acid tail gas inlet pipe are respectively arranged at different positions of tower body, and gas external circulation pipe is arranged between the top of tower body and hydrochloric acid tail gas inlet pipe, which can adapt to the case that the amount of hydrochloric acid tail gas is large, and the hydrochloric acid tail gas treatment process is not affected.

Description

Technical Field

[0001] This utility model relates to the field of hydrochloric acid preparation technology, and in particular to a hydrochloric acid tail gas absorption device. Background Technology

[0002] Even at the end of the hydrochloric acid production process, there will still be tail gas containing hydrogen chloride, which should not be directly emitted. Most existing hydrochloric acid tail gas treatment equipment uses spraying to neutralize and absorb hydrochloric acid, or directly passes the tail gas containing hydrogen chloride into a condenser to condense the tail gas and recover the hydrogen chloride, thus achieving hydrochloric acid recovery.

[0003] For example, a Chinese utility model (title: "A Gas-Liquid Mixing Structure for a Hydrochloric Acid Absorption Tower", announcement number: CN212974660U, announcement date: 20210416) discloses a gas-liquid mixing structure for a hydrochloric acid absorption tower, including a base, with a hydrochloric acid absorption tower fixedly connected to the upper surface of the base. A spray pipe is installed inside the hydrochloric acid absorption tower, and a nozzle is fixedly connected to the top of the spray pipe. This gas-liquid mixing structure, by setting up a spray pipe, nozzle, mixing tank, and channel, allows gas to enter from the top of the hydrochloric acid absorption tower through the inlet pipe. At this time, a booster pump operates, drawing tap water from the storage tank and directing it through the inlet pipe to the spray pipe inside the hydrochloric acid absorption tower. The water is then sprayed out from the nozzle on the spray pipe. The gas and the water mist sprayed from the nozzle move in opposite directions, increasing the contact time between the gas and tap water, allowing for thorough gas-liquid mixing.

[0004] In this gas-liquid mixing structure, hydrochloric acid tail gas is fed from the top of the hydrochloric acid absorption tower and mixed with atomized droplets from the nozzle. However, if the intake volume of hydrochloric acid tail gas is large, and the tail gas in the hydrochloric acid absorption tower cannot be completely adsorbed in time, it will cause the internal pressure of the hydrochloric acid absorption tower to increase, affecting the hydrochloric acid tail gas treatment process. Utility Model Content

[0005] This utility model aims to provide a hydrochloric acid tail gas absorption device, which sets the nozzle and hydrochloric acid tail gas inlet pipe at different positions on the upper and lower parts of the tower body, and sets an external gas circulation pipe between the top of the tower body and the hydrochloric acid tail gas inlet pipe. This can adapt to the situation where the amount of hydrochloric acid tail gas entering is large, and the hydrochloric acid tail gas treatment process is not affected.

[0006] The technical solution adopted in this utility model is:

[0007] A hydrochloric acid tail gas absorption device, comprising:

[0008] An absorption tower, comprising a tower body; a gas circulation port is provided at the top of the tower body, and a drain port is provided at the bottom; a nozzle is also provided near the top of the inner side of the tower body.

[0009] A hydrochloric acid tail gas inlet pipe, wherein the outlet end of the hydrochloric acid tail gas inlet pipe is located at the lower inner side of the tower body;

[0010] An acid pump is provided, with a first acid pipe and a second acid pipe connected to its inlet and outlet ends, respectively. The other end of the first acid pipe is connected to the nozzle, and the other end of the second acid pipe is connected to the drain outlet.

[0011] The external gas circulation pipe has one end connected to the gas circulation interface and the other end connected to the hydrochloric acid tail gas inlet pipe. The angle α between the inlet direction of the internal circulation gas in the outlet section of the external gas circulation pipe and the inlet direction of the hydrochloric acid tail gas in the hydrochloric acid tail gas inlet pipe forms an acute angle.

[0012] Furthermore, α is 10~45°.

[0013] Furthermore, a baffle assembly is provided between the nozzle and the outlet end of the hydrochloric acid exhaust gas inlet pipe.

[0014] Furthermore, the deflector assembly includes:

[0015] The first baffle funnel has its lower pointed outlet facing the bottom of the tower body, and its top open edge is connected to the inner wall of the tower body.

[0016] The first annular spray pipe is disposed on the conical outer wall of the first baffle funnel and is connected to the first acid pipe; a plurality of spray holes are provided on the circumferential side wall of the first annular spray pipe.

[0017] At least one second baffle funnel is located below the first baffle funnel, with its lower pointed outlet facing the bottom of the tower body and its top open edge connected to the inner wall of the tower body; a through hole is also provided at the connection between the second baffle funnel and the tower body.

[0018] The second annular spray pipe is arranged one by one on the conical outer wall of the second baffle funnel and is connected to the first acid pipe; a number of spray holes are opened on the circumferential side wall of the second annular spray pipe.

[0019] Furthermore, in the vertical direction, the tip outlet of the second baffle funnel located at the bottom is offset from the outlet end of the hydrochloric acid tail gas inlet pipe, and the corresponding through hole is located on the opposite side of the outlet end of the hydrochloric acid tail gas inlet pipe with reference to the tip outlet of the second baffle funnel.

[0020] Furthermore, when there are two or more second deflector funnels, the positions of the through holes of the adjacent second deflector funnels are staggered vertically.

[0021] Furthermore, when there are two or more second deflection funnels, the positions of the tip outlets of the adjacent second deflection funnels are also staggered vertically.

[0022] Furthermore, from top to bottom, the size of the tip outlet of the first baffle funnel and the second baffle funnel gradually decreases.

[0023] Furthermore, grooves are formed on the conical walls of the first baffle funnel and / or the second baffle funnel.

[0024] The beneficial effects of this utility model are:

[0025] This utility model provides a hydrochloric acid tail gas absorption device, in which the nozzle and hydrochloric acid tail gas inlet pipe are respectively set at different positions on the upper and lower parts of the tower body. At the same time, a gas external circulation pipe is set between the top of the tower body and the hydrochloric acid tail gas inlet pipe, which can adapt to the situation where the amount of hydrochloric acid tail gas entering is large, and the hydrochloric acid tail gas treatment process is not affected. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a front view of the hydrochloric acid tail gas absorption device in the embodiment.

[0028] Figure 2 This is a top view of the hydrochloric acid tail gas absorption device in the embodiment.

[0029] Figure 3 for Figure 2 Sectional view along the AA direction.

[0030] Figure 4 This is a three-dimensional structural schematic diagram of the hydrochloric acid tail gas absorption device in the embodiment.

[0031] The attached figures are labeled as follows:

[0032] 100. Absorption tower; 110. Tower body; 111. Gas circulation interface; 112. Drain outlet; 120. Hydrochloric acid tail gas inlet pipe; 130. Nozzle; 140. Clean water inlet pipe; 150. Gas external circulation pipe.

[0033] 200, Acid pump; 210, First acid pipe; 220, Second acid pipe.

[0034] 300, baffle assembly; 310, first baffle funnel; 311, first annular spray pipe; 320, second baffle funnel; 321, through hole; 322, second annular spray pipe. Detailed Implementation

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0037] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0038] Figure 1 This is a front view of the hydrochloric acid tail gas absorption device in the embodiment. Figure 2 This is a top view of the hydrochloric acid tail gas absorption device in the embodiment. Figure 3 for Figure 2 Sectional view along the AA direction. Figure 4 This is a three-dimensional structural schematic diagram of the hydrochloric acid tail gas absorption device in the embodiment. Figures 1-4As shown, the hydrochloric acid tail gas absorption device includes an absorption tower 100 and an acid pump 200 disposed outside the absorption tower 100. The absorption tower 100 includes a columnar tower body 110; a gas circulation interface 111 is provided at the top of the tower body 110, and a drain port 112 is provided at the bottom of the tower body 110. An electric valve (not shown in the figure) is also provided at the drain port 112; an L-shaped hydrochloric acid tail gas inlet pipe 120 is also provided at the lower part of the tower body 110. One end of the hydrochloric acid tail gas inlet pipe 120 (the inlet of hydrochloric acid tail gas) is located outside the tower body 110, and the top of its vertical part (the outlet of hydrochloric acid tail gas) is located inside the tower body 110. The axial center of the vertical part of the hydrochloric acid tail gas inlet pipe 120 does not coincide with the axial center of the tower body 110. That is, the hydrochloric acid tail gas released from the outlet end of the hydrochloric acid tail gas inlet pipe 120 flows vertically towards the tower body 110 in a direction other than the axial center of the tower body 110. The upper part is released; a nozzle 130 is still provided in the inner top area of ​​the tower body 110; a clean water inlet pipe 140 is also provided near the top of the tower body 110; a gas external circulation pipe 150 is also provided on the outside of the tower body 110, one end of the gas external circulation pipe 150 is connected to the gas circulation interface 111, and the other end is connected to the part of the hydrochloric acid tail gas inlet pipe 12 located outside the tower body 110, and the angle α between the center line of the horizontal part of the hydrochloric acid tail gas inlet pipe 120 and the center line of the outlet section of the gas external circulation pipe 150 is 10~45° (that is, the angle between the direction of hydrochloric acid tail gas entering the horizontal part of the hydrochloric acid tail gas inlet pipe 120 and the direction of circulating gas entering the outlet section of the gas external circulation pipe 150 is 10~45°). The outlet end of the acid pump 200 is connected to a first acid pipe 210, and the other end of the first acid pipe 210 is connected to a nozzle 130; the inlet end of the acid pump 200 is connected to a second acid pipe 220, and the other end of the second acid pipe 220 is connected to a drain port 112.

[0039] In this embodiment, hydrochloric acid tail gas enters the tower body 110 along the hydrochloric acid tail gas inlet pipe 120; the acid pump 200 draws a portion of the absorbent (i.e., dilute hydrochloric acid with low concentration and purity) from the drain port 112, which flows along the first acid pipe 210 and the second acid pipe 220, and then sprays out from the nozzle 130, forming small droplets, which fall under their own gravity and come into contact with the hydrochloric acid tail gas to achieve adsorption; when the amount of absorbent is insufficient, clean water is added to the tower body 110 through the clean water inlet pipe 140; the hydrochloric acid tail gas near the top of the tower body 110 that has not yet been adsorbed is drawn into the hydrochloric acid tail gas inlet pipe 120 along with the new hydrochloric acid tail gas and enters the tower body 110 for adsorption treatment.

[0040] In this embodiment, the nozzle and hydrochloric acid tail gas inlet pipe are respectively set at different positions on the top and bottom of the tower body. At the same time, a gas external circulation pipe is set between the top of the tower body and the hydrochloric acid tail gas inlet pipe. This can accommodate situations where the amount of hydrochloric acid tail gas entering is large, and the hydrochloric acid tail gas treatment process is not affected.

[0041] In this embodiment, the hydrochloric acid tail gas absorption device further includes a baffle assembly 300. The baffle assembly 300 is disposed within the tower body 110, between the nozzle 130 and the outlet end of the hydrochloric acid tail gas inlet pipe 120. When the hydrochloric acid tail gas passes through the baffle assembly 300, its direction of movement changes, thereby increasing the contact time between the hydrochloric acid tail gas and the adsorption liquid and ensuring the adsorption treatment effect of the hydrochloric acid tail gas.

[0042] Furthermore, in this embodiment, the baffle assembly 300 includes a first baffle funnel 310 and a second baffle funnel 320. The first baffle funnel 310 is located above the second baffle funnel 320, and the pointed outlets (i.e., the ends with smaller opening diameters) of both face the bottom of the tower body 110; the top open edges of the first baffle funnel 310 and the second baffle funnel 320 are connected to the inner wall of the tower body 110; a rectangular through hole 321 is also provided at the connection between the top open edge of the second baffle funnel 320 and the inner wall of the tower body 110. Taking the pointed outlet of the second baffle funnel 320 as a reference point, the through hole 321 and the outlet end of the vertical part of the hydrochloric acid tail gas inlet pipe 120 are located on opposite left and right sides, respectively. On both sides; at the same time, a first annular spray pipe 311 and a second annular spray pipe 322 are also provided on the conical outer wall of the first baffle funnel 310 and the second baffle funnel 320 near the connection with the inner wall of the tower body 110. The position of the second annular spray pipe 322 does not overlap with the position of the through hole 321 (i.e., it does not affect the passage of the through hole 321). Several spray holes (not shown in the figure) are opened on the circumferential sidewalls of the first annular spray pipe 311 and the second annular spray pipe 322, and the first annular spray pipe 311 and the second annular spray pipe 322 are also connected to the first acid pipe 210 respectively. After the hydrochloric acid tail gas is released from the hydrochloric acid tail gas inlet pipe 120 within the tower body 110, it forms an upward and downward circulating airflow below the second baffle funnel 320, simultaneously contacting, mixing, and adsorbing with the adsorbent sprayed from the second annular spray pipe 322. Part of the hydrochloric acid tail gas enters the area between the first baffle funnel 310 and the second baffle funnel 320 through the through hole 321, contacting, mixing, and adsorbing with the adsorbent sprayed from the first annular spray pipe 311. The remaining hydrochloric acid tail gas enters the area above the first baffle funnel 310 from its tip outlet, contacting, mixing, and adsorbing with the adsorbent sprayed from the nozzle 130. In this embodiment, the design of the first and second baffle funnels alters the flow path of the hydrochloric acid tail gas within the tower body, and, in conjunction with the first and second annular spray pipes, ensures the effective adsorption of the hydrochloric acid tail gas.

[0043] It should be noted that in this embodiment, the second baffle funnel 320 and the corresponding second annular spray pipe 322 can be multiple sets arranged vertically at intervals, all located below the first baffle funnel 310. Furthermore, when there are multiple second baffle funnels 320, the positions of the through holes 321 of adjacent second baffle funnels 320 are staggered vertically, and the positions of their tip outlets are also staggered vertically; thus, the flow path of the acid salt tail gas between the multiple second baffle funnels 320 can be further extended, improving the treatment effect of the hydrochloric acid tail gas. Simultaneously, from top to bottom, the size of the tip outlets of the first baffle funnel 310 and the second baffle funnel 320 gradually decreases, reducing the amount of hydrochloric acid tail gas flowing upwards from the tip outlet diameter of the first baffle funnel 310 and the second baffle funnel 320.

[0044] In this embodiment, in order to increase the contact area between the hydrochloric acid tail gas and the adsorbent along the conical walls (including the outer and inner conical walls) of the first baffle funnel 310 and the second baffle funnel 320, grooves are provided on the conical walls of the first baffle funnel 310 and the second baffle funnel 320 (not shown in the figure).

Claims

1. A hydrochloric acid tail gas absorption device, characterized in that, include: An absorption tower, comprising a tower body; a gas circulation port is provided at the top of the tower body, and a drain port is provided at the bottom; a nozzle is also provided near the top of the inner side of the tower body. A hydrochloric acid tail gas inlet pipe, wherein the outlet end of the hydrochloric acid tail gas inlet pipe is located at the lower inner side of the tower body; An acid pump is provided, with a first acid pipe and a second acid pipe connected to its inlet and outlet ends, respectively. The other end of the first acid pipe is connected to the nozzle, and the other end of the second acid pipe is connected to the drain outlet. The external gas circulation pipe has one end connected to the gas circulation interface and the other end connected to the hydrochloric acid tail gas inlet pipe. The angle α between the inlet direction of the internal circulation gas in the outlet section of the external gas circulation pipe and the inlet direction of the hydrochloric acid tail gas in the hydrochloric acid tail gas inlet pipe forms an acute angle.

2. The hydrochloric acid tail gas absorption device according to claim 1, characterized in that, α is 10~45°.

3. The hydrochloric acid tail gas absorption device according to claim 1 or 2, characterized in that, A baffle assembly is also provided between the nozzle and the outlet end of the hydrochloric acid exhaust gas inlet pipe.

4. The hydrochloric acid tail gas absorption device according to claim 3, characterized in that, The deflector assembly includes: The first baffle funnel has its lower pointed outlet facing the bottom of the tower body, and its top open edge is connected to the inner wall of the tower body. The first annular spray pipe is disposed on the conical outer wall of the first baffle funnel and is connected to the first acid pipe; a plurality of spray holes are provided on the circumferential side wall of the first annular spray pipe. At least one second baffle funnel is located below the first baffle funnel, with its lower pointed outlet facing the bottom of the tower body and its top open edge connected to the inner wall of the tower body; a through hole is also provided at the connection between the second baffle funnel and the tower body. The second annular spray pipe is arranged one by one on the conical outer wall of the second baffle funnel and is connected to the first acid pipe; a number of spray holes are opened on the circumferential side wall of the second annular spray pipe.

5. The hydrochloric acid tail gas absorption device according to claim 4, characterized in that, In the vertical direction, the tip outlet of the second baffle funnel located at the bottom is offset from the outlet end of the hydrochloric acid tail gas inlet pipe, and the corresponding through hole is located on the opposite side of the outlet end of the hydrochloric acid tail gas inlet pipe with reference to the tip outlet of the second baffle funnel.

6. The hydrochloric acid tail gas absorption device according to claim 4 or 5, characterized in that, When there are two or more second baffle funnels, the positions of the through holes of the adjacent second baffle funnels are staggered vertically.

7. The hydrochloric acid tail gas absorption device according to claim 6, characterized in that, When there are two or more second baffle funnels, the positions of the tip outlets of the adjacent second baffle funnels are also staggered vertically.

8. The hydrochloric acid tail gas absorption device according to claim 7, characterized in that, From top to bottom, the size of the tip outlet of the first and second baffle funnels gradually decreases.

9. The hydrochloric acid tail gas absorption device according to any one of claims 4, 5, 7 and 8, characterized in that, The first baffle funnel and / or the second baffle funnel have grooves formed on their conical walls.

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