Auxiliary device for improving productivity of refined sulfuric acid

Abstract

The utility model discloses an auxiliary device for improving the productivity of refined sulfuric acid, which comprises a circulating tank and a three-way pipe, two pipe sections of the three-way pipe are respectively connected with an external water system and an absorption tower reflux system, and the rest pipe section of the three-way pipe is connected with a spiral mixing pipe. The tail end of the spiral mixing pipe is connected with a water guide pipe extending into the circulating tank, the three-way pipe is a Y-shaped three-way pipe, and an external water system and an absorption tower reflux system are positioned on two pipe sections at the upper end of the Y-shaped three-way pipe. According to the design scheme provided by the utility model, the Y-shaped three-way pipe is adopted as a primary mixing part of concentrated sulfuric acid and water, the concentrated sulfuric acid and the water enter the spiral mixing pipe after being primarily mixed, and the spiral structure of the spiral mixing pipe, which is gradually expanded from top to bottom, enables materials to form a turbulent flow state, so that the materials are uniformly mixed; meanwhile, the internal mixed materials do horizontal rotary motion from top to bottom, so that the material retention time can be prolonged, and efficient mixing treatment can be realized in a limited space.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of flue gas acid making, and specifically relates to an auxiliary device for improving refined sulfuric acid production capacity. BACKGROUND

[0002] The adiabatic evaporation acid pickling purification and double-rotation double-suction conversion process is a common flue gas acid making process of the current acid making system, has the advantages of stable operation, high conversion rate and low tail gas discharge data, and is widely used in the non-ferrous smelting industry. The dry absorption process is an important process in the flue gas acid making process, and is mainly divided into drying, first absorption and second absorption processes. The first absorption and second absorption processes are to extract concentrated sulfuric acid from the circulating tank by a circulating pump, absorb SO3 in the flue gas through an absorption tower, further increase the concentration of the concentrated sulfuric acid, and then return the concentrated sulfuric acid to the circulating tank through the bottom of the absorption tower for acid mixing. Then, water is added to the circulating tank to adjust the concentration of the sulfuric acid, so as to ensure the recycling.

[0003] The existing circulating tank water adding device generally only connects a water guide pipe or an acid mixer near the reflux port of the concentrated acid. The mixing of the concentrated sulfuric acid and water is not good, which affects the adjustment quality of the sulfuric acid concentration and the quality of the subsequent flue gas acid making. In view of this, an auxiliary device for improving refined sulfuric acid production capacity is provided. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the above-mentioned problems, and provides an auxiliary device for improving refined sulfuric acid production capacity.

[0005] The utility model adopts the technical scheme as follows: an auxiliary device for improving refined sulfuric acid production capacity, comprising a circulating tank and a tee pipe, two pipe sections of the tee pipe are connected with an external water system and an absorption tower reflux system respectively, and the remaining pipe section of the tee pipe is connected with a spiral mixing pipe, and the tail end of the spiral mixing pipe is connected with a water guide pipe extending into the circulating tank.

[0006] In a preferred embodiment, the tee pipe is a Y-shaped tee pipe, and the external water system and the absorption tower reflux system are located on the two pipe sections at the upper end of the Y-shaped tee pipe.

[0007] In a preferred embodiment, the main body radius of the spiral mixing pipe gradually increases from top to bottom.

[0008] In a preferred embodiment, the water guide pipe is located in the sulfuric acid solution inside the circulating tank, and a plurality of groups of water permeable holes are formed in the outer wall surface of the water guide pipe in a circumferential direction.

[0009] In a preferred embodiment, a check valve is further arranged at the connection between the water guide pipe and the spiral mixing pipe.

[0010] In a preferred embodiment, the spiral mixing tube is provided with a cooling channel along its length direction, and the cooling channel is of a spiral structure.

[0011] In a preferred embodiment, the spiral mixing tube is provided with a water inlet pipe and a water outlet pipe at its two ends, which are connected with the cooling channel.

[0012] In a preferred embodiment, the circulating tank is further provided with a liquid outlet pipe connected with the external absorption tower.

[0013] In summary, due to the adoption of the above technical solutions, the present application has the following advantages:

[0014] 1. In the present application, a Y-shaped three-way pipe is used as a preliminary mixing device for concentrated sulfuric acid and water. After the preliminary mixing of the concentrated sulfuric acid and water, the mixture will enter the spiral mixing tube. The gradually expanding spiral structure of the spiral mixing tube from top to bottom causes the material to form a turbulent flow state, which helps to uniformly mix the material. Meanwhile, the internal mixed material performs horizontal rotational motion from top to bottom, which can prolong the residence time of the material, realize efficient mixing treatment in a limited space, and ensure the adjustment effect of the sulfuric acid concentration.

[0015] 2. In the present application, a water guide pipe with multiple water permeable holes is designed at the tail of the spiral mixing tube. After the mixing of the sulfuric acid and water, the mixture can be discharged into the circulating tank through the multiple water permeable holes of the water guide pipe. The multiple water permeable holes arranged in the circumferential direction can increase the contact area with the sulfuric acid inside the circulating tank, thereby improving the acid concentration effect.

[0016] 3. In the present application, a cooling channel is designed in the spiral mixing tube. During the mixing process, the internal mixture can be cooled by external cold water, which can reduce the generation of dilute acid mist, water vapor, etc. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a sectional plane structure schematic view of the whole of the present application.

[0018] Figure 2 It is a three-dimensional structure schematic view of the spiral mixing tube in the present application.

[0019] Figure 3 It is a partial sectional plane structure schematic view of the spiral mixing tube in the present application.

[0020] Figure 4 It is a partial plane structure schematic view of the water guide pipe in the present application.

[0021] Markings in the figure: 1-circulating tank, 2-liquid outlet pipe, 3-water guide pipe, 31-water permeable hole, 4-check valve, 5-spiral mixing tube, 51-cooling channel, 6-three-way pipe, 7-water outlet pipe, 8-water inlet pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0023] With reference to Figures 1-4 The utility model discloses an auxiliary device for improving refined sulfuric acid productivity, including circulating tank 1 and three -way pipe 6, two pipe sections of three -way pipe 6 are connected with external water system and absorption tower backflow system respectively, and the remaining one pipe section of three -way pipe 6 is connected with spiral mixing pipe 5, the tail end of spiral mixing pipe 5 is connected with the water guide pipe 3 that extends into the circulating tank 1, and the main body radius of spiral mixing pipe 5 gradually expands from top to bottom, when concentrated sulfuric acid and water are discharged into the inside of spiral mixing pipe 5 through three -way pipe 6, the spiral structure of spiral mixing pipe 5 gradually expands from top to bottom, and the material forms turbulent flow state, which helps the mixing of material even, and the internal mixed material (and water and ammonium sulfate) simultaneously does horizontal rotary motion from top to bottom, can extend the material residence time, can realize efficient mixing treatment in limited space, can guarantee the adjustment precision of sulfuric acid concentration, and be favorable to improving the preparation quality of subsequent sulfuric acid.

[0024] Further, three -way pipe 6 is Y-shaped three -way pipe, and external water system and absorption tower backflow system (not shown in the drawing) are located on the two pipe sections of Y-shaped three -way pipe on the upper end, and the above design makes water and concentrated sulfuric acid can realize preliminary contact mixing between the two pipe sections when being discharged into three -way pipe 6, wherein the external water system can include water tank, pump body and the like, and the absorption tower backflow system is the backflow pipeline reserved on the absorption tower.

[0025] Further, the water guide pipe 3 is in the sulfuric acid solution inside the circulating tank 1, a plurality of water permeable holes 31 are circumferentially formed on the outer wall surface of the water guide pipe 3, and after sulfuric acid and water are mixed, they can be discharged into the circulating tank 1 through the plurality of water permeable holes 31 of the water guide pipe 3. The plurality of water permeable holes 31 circumferentially arranged can increase the contact area with the original sulfuric acid inside the circulating tank 1, thereby improving the effect of serial acidification.

[0026] Further, a check valve 4 is further arranged at the connection between the water guide pipe 3 and the spiral mixing pipe 5, which can prevent the original sulfuric acid inside the circulating tank 1 from flowing out of the water guide pipe 3, wherein the check valve 4 is arranged in a direction that can only discharge into the circulating tank 1 from the water guide pipe 3.

[0027] Further, the circulating tank 1 is further provided with a liquid outlet pipe 2 connected with an external absorption tower.

[0028] Further, the helical mixing tube 5 is provided with a cooling channel 51 along the length direction thereof, the cooling channel 51 is of a helical structure, the two end side walls of the helical mixing tube 5 are provided with a water inlet pipe 8 and a water outlet pipe 7 which are communicated with the cooling channel 51, the cooling channel 51 is designed in the helical mixing tube 5, in the mixing process, the external cold water is discharged into the cooling channel 51 through the water inlet pipe 8, and the internal mixture is cooled in the flowing process (a large amount of heat is generated when sulfuric acid and water are mixed), so that the generation of acid mist, water vapor and the like of the dilute acid can be reduced.

[0029] The water inlet pipe 8 can be connected with a cooling water tank with a water pump, the discharged hot water can be applied to a heat exchange system or other equipment which can use hot water, and the application is not limited

[0030] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An auxiliary device for increasing the production capacity of refined sulfuric acid, characterized in that, The three-way pipe is Y-shaped, and the external water system and the absorption tower reflux system are located on two pipe sections at the upper end of the Y-shaped three-way pipe.

2. An auxiliary device for increasing the production capacity of refined sulphuric acid according to claim 1, characterized in that: The main body radius of the spiral mixing pipe gradually increases from top to bottom.

3. An auxiliary device for increasing the production capacity of refined sulphuric acid according to claim 1, characterized in that: The water guide pipe is located in the sulfuric acid solution inside the circulating tank, and a plurality of water permeable holes are arranged on the outer wall of the water guide pipe.

4. An auxiliary device for increasing the production capacity of refined sulphuric acid according to claim 1, characterized in that: A check valve is arranged at the connection between the water guide pipe and the spiral mixing pipe.

5. An auxiliary device for increasing the production capacity of refined sulphuric acid according to claim 1, characterized in that: A cooling channel is arranged in the spiral mixing pipe along the length direction of the spiral mixing pipe, and the cooling channel is in a spiral structure.

6. An auxiliary device for increasing the production capacity of refined sulphuric acid according to claim 1, characterized in that: Water inlet pipes and water outlet pipes are arranged on the side walls of the two ends of the spiral mixing pipe and are connected with the cooling channel.

7. An auxiliary device for increasing the production capacity of refined sulphuric acid according to claim 6, characterized in that: An outlet pipe is arranged on the circulating tank and is connected with the external absorption tower.

8. An auxiliary device for increasing the production capacity of refined sulphuric acid according to claim 1, characterized in that: ​

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