Sulfuric acid preparation system

Abstract

The utility model relates to a sulfuric acid preparation system which comprises a graphite cooler, a dilute sulfuric acid storage tank and a pressure regulating module, an acid mixing cavity of the graphite cooler is communicated with a concentrated sulfuric acid pipeline, a blow-down pipe and a fresh water pipeline; the dilute sulfuric acid storage tank is communicated with the blow-down pipe through a pressure regulating pipe; the pressure regulating module comprises a negative pressure preventing tank, a positive pressure preventing tank, a negative pressure preventing pipe and a positive pressure preventing pipe; an air outlet of the negative pressure prevention tank is communicated with the blow-down pipe through a negative pressure prevention pipe; the negative pressure prevention tank is provided with a negative pressure tank water supply pipe and a negative pressure air inlet pipe; an air inlet of the positive pressure prevention tank is communicated with the blow-down pipe through a positive pressure prevention pipe, and the positive pressure prevention tank is communicated with a fresh water pipeline through a positive pressure tank water supply pipe; the graphite cooler is also communicated with a circulating water inlet pipeline and a circulating water outlet pipeline; a sulfuric acid outlet is formed in the bottom of the graphite cooler and is higher than the dilute sulfuric acid storage tank; the sulfuric acid preparation system can treat acid mist and can adjust the pressure of the sulfuric acid preparation equipment so as to ensure stable functions.

Description

Technical Field

[0001] The utility model relates to the field of solution configuration, in particular to a sulfuric acid configuration system. Background Art

[0002] The sulfuric acid preparation device in the existing workshop is mainly an enamel kettle. First, water is added, and then concentrated sulfuric acid is slowly added to adjust to the required concentration of dilute sulfuric acid. The preparation process is relatively slow. Splashing is easy to occur during the addition of sulfuric acid. When sulfuric acid and water are mixed, a large amount of heat is released, which causes the water to heat up and even boil to produce acid mist. Usually, the acid mist is output to the dilution cooler and then directly sent to the atmosphere through a pipeline or input to the next equipment for water absorption or condensation into dilute acid for further treatment. The existing sulfuric acid preparation device cannot meet the current production needs, resulting in production waste. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a sulfuric acid configuration system, which can process acid mist and adjust the pressure of sulfuric acid configuration equipment to ensure its functional stability.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a sulfuric acid configuration system, including a graphite cooler, a dilute sulfuric acid storage tank and a pressure regulating module;

[0005] The mixed acid chamber of the graphite cooler is connected with a concentrated sulfuric acid pipeline, a vent pipe and a fresh water pipeline; concentrated sulfuric acid is input into the graphite cooler through the concentrated sulfuric acid pipeline, water is input into the graphite cooler through the fresh water pipeline, and the vent pipe is connected to the pressure regulating module;

[0006] The dilute sulfuric acid storage tank is connected to the vent pipe through a pressure regulating pipe;

[0007] The pressure regulating module comprises a negative pressure prevention tank, a positive pressure prevention tank, a negative pressure prevention pipe and a positive pressure prevention pipe;

[0008] The air outlet of the negative pressure prevention tank is connected to the vent pipe through the negative pressure prevention pipe. The negative pressure prevention tank is provided with a negative pressure tank water supply pipe and a negative pressure air inlet pipe. The negative pressure tank water supply pipe is connected to the fresh water pipeline. The negative pressure tank water supply pipe and the negative pressure air inlet pipe both extend below the liquid level of the negative pressure prevention tank.

[0009] The air inlet of the positive pressure prevention tank is connected to the vent pipe through the positive pressure prevention pipe, and the positive pressure prevention tank is connected to the fresh water pipeline through the positive pressure tank water supply pipe. The positive pressure tank water supply pipe and the positive pressure prevention pipe are both extended below the liquid level of the positive pressure prevention tank;

[0010] The graphite cooler is also connected to a circulating water inlet pipeline and a circulating water outlet pipeline;

[0011] A sulfuric acid outlet is provided at the bottom of the graphite cooler, and the sulfuric acid outlet is higher than the dilute sulfuric acid storage tank. The diluted sulfuric acid flows to the dilute sulfuric acid storage tank through the sulfuric acid collecting pipe.

[0012] As a preferred technical solution, a detection port is provided on the circulating water outlet pipeline for detecting the pH value of the circulating water.

[0013] As a preferred technical solution, a portion of the sulfuric acid collecting pipe is higher than the sulfuric acid outlet of the graphite cooler.

[0014] As a preferred technical solution, the sulfuric acid collecting pipe includes a front pipe section, two rotating joints, a liquid level regulating pipe section and a rear pipe section; the front pipe section is horizontally arranged and connected to the sulfuric acid outlet of the graphite cooler; the rear pipe section is horizontally arranged and coaxial with the front pipe section; the liquid level regulating pipe section is in the shape of a "J", and its two ends are respectively connected and connected to the front pipe section and the rear pipe section through rotating joints; the lower end of the liquid level regulating pipe section is fixedly connected with an adjusting shaft, the adjusting shaft is coaxial with the front pipe section, and the adjusting shaft is adjustably mounted on the bracket.

[0015] As a preferred technical solution, a lower shaft seat is fixed on the bracket, and an upper shaft seat is detachably mounted on the lower shaft seat; the adjustment shaft is located between the upper shaft seat and the lower shaft seat, and the adjustment shaft can be released or locked by adjusting the upper shaft seat.

[0016] As a preferred technical solution, an auxiliary tightening bolt is threadedly connected to the upper shaft seat, and the auxiliary tightening bolt passes through the upper shaft seat and abuts against the adjusting shaft.

[0017] As a preferred technical solution, the dilute sulfuric acid storage tank is also connected to a dilute sulfuric acid supply pipeline and a dilute sulfuric acid reflux pipe, a pump body is arranged on the dilute sulfuric acid supply pipeline, and the connecting position of the dilute sulfuric acid reflux pipe and the dilute sulfuric acid supply pipeline is located on the downstream side of the pump body.

[0018] Due to the adoption of the above technical solution, the sulfuric acid preparation system has the following advantages:

[0019] Since the sulfuric acid outlet of the graphite cooler is higher than the dilute sulfuric acid storage tank, the fluidity of the liquid is used to realize the automatic flow of diluted sulfuric acid into the dilute sulfuric acid storage tank. The pressure regulating module can be used to adjust the internal pressure of the graphite cooler and the dilute sulfuric acid storage tank to maintain their working stability. The overall structure of the system is simple and the equipment utilization rate is high.

[0020] Graphite cooler is not only resistant to acid corrosion, but also has good thermal conductivity. Its thermal conductivity is 2 times that of carbon steel and 5 times that of stainless steel. It can realize continuous dilute sulfuric acid preparation and cooling, saving the energy required for sulfuric acid preparation and solving the problem of production waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is the structural principle diagram of the sulfuric acid configuration system;

[0023] Figure 2 It is a schematic diagram of the structure of the sulfuric acid collection tube;

[0024] Figure 3 It is a schematic diagram of the installation structure of the adjusting shaft.

[0025] In the figure:

[0026] 1-concentrated sulfuric acid pipeline; 2-graphite cooler; 3-vent pipe; 4-fresh water pipeline; 5-positive pressure tank water supply pipe; 6-negative pressure tank water supply pipe; 7-circulating water outlet pipeline; 8-pressure regulating pipe; 9-negative pressure prevention pipe; 10-positive pressure prevention pipe; 11-circulating water inlet pipeline; 12-sulfuric acid collecting pipe; 121-front pipe section; 122-rotating joint; 123-liquid level adjustment pipe section; 124-rear pipe section; 125-adjusting shaft; 126-upper shaft seat; 127-lower shaft seat; 128-bracket; 129-auxiliary tightening bolt; 13-negative pressure prevention tank; 14-positive pressure prevention tank; 15-dilute sulfuric acid storage tank; 16-dilute sulfuric acid supply pipeline; 17-dilute sulfuric acid reflux pipe; 18-negative pressure inlet pipe. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, a sulfuric acid configuration system includes a graphite cooler 2, a dilute sulfuric acid storage tank 15 and a pressure regulating module. The sulfuric acid outlet of the graphite cooler 2 is set higher than the dilute sulfuric acid storage tank 15, and the fluidity of the liquid is used to realize that the diluted sulfuric acid automatically flows into the dilute sulfuric acid storage tank 15, which can simplify the equipment structure. The pressure regulating module can be used to adjust the internal pressure of the graphite cooler 2 and the dilute sulfuric acid storage tank 15 to maintain their working stability.

[0028] The upper space of the graphite cooler 2 forms a mixed acid chamber, and the lower space forms a cooling chamber. The mixed acid chamber of the graphite cooler 2 is connected with a concentrated sulfuric acid pipeline 1, a vent pipe 3 and a fresh water pipeline 4; concentrated sulfuric acid is input into the mixed acid chamber through the concentrated sulfuric acid pipeline 1, and water is input into the mixed acid chamber through the fresh water pipeline 4; concentrated sulfuric acid and water are mixed in the mixed acid chamber and release heat; the heat will affect the pressure in the graphite cooler 2, forming pressure fluctuations; and the vent pipe 3 is connected to the pressure regulating module.

[0029] The pressure regulating module includes a negative pressure prevention tank 13, a positive pressure prevention tank 14, a negative pressure prevention pipe 9 and a positive pressure prevention pipe 10. The vent pipe 3 is connected to the negative pressure prevention pipe 9 and the positive pressure prevention pipe 10, the negative pressure prevention pipe 9 is connected to the air outlet of the negative pressure prevention tank 13, and the positive pressure prevention pipe 10 is connected to the air inlet of the positive pressure prevention tank 14.

[0030] At the same time, the negative pressure tank 13 is also provided with a negative pressure tank water supply pipe 6 and a negative pressure air intake pipe 18. The negative pressure tank water supply pipe 6 is connected to the fresh water pipeline 4, and is used to supply water to the negative pressure tank 13 to maintain a certain amount of water in the negative pressure tank 13; the negative pressure air intake pipe 18 connects the outside with the inside of the negative pressure tank 13, and the negative pressure tank water supply pipe 6 and the negative pressure air intake pipe 18 are both extended below the liquid level of the negative pressure tank 13. When the graphite cooler 2 is in a negative pressure state, the outside gas enters the negative pressure tank 13 through the negative pressure air intake pipe 18, and after being cleaned by water, it enters the graphite cooler 2 along the negative pressure prevention pipe 9 and the vent pipe 3 to maintain the pressure in the graphite cooler 2.

[0031] The positive pressure prevention tank 14 is connected to the fresh water pipeline 4 through the positive pressure tank water supply pipe 5, and the water in the fresh water pipeline 4 flows into the positive pressure prevention tank 14 and forms a certain liquid level; the positive pressure tank water supply pipe 5 and the positive pressure prevention pipe 10 are both extended below the liquid level of the positive pressure prevention tank 14. When the pressure in the graphite cooler 2 is greater than the set value, the acid mist will enter the positive pressure prevention tank 14 through the vent pipe 3 and the positive pressure prevention pipe 10; after being washed and absorbed by water, the sulfuric acid in the acid mist is absorbed by water, and the purified tail gas is then processed or discharged.

[0032] The graphite cooler 2 is also connected to a circulating water inlet pipeline 11 and a circulating water outlet pipeline 7 for cooling the graphite cooler 2. A detection port is provided on the circulating water outlet pipeline 7 for detecting the pH value of the circulating water; if it is found to be acidic, the acid preparation is stopped immediately, and the circulating water inlet pipeline 11 and the circulating water outlet pipeline 7 are closed.

[0033] A sulfuric acid outlet is provided at the bottom of the graphite cooler 2, and the sulfuric acid outlet is connected to the dilute sulfuric acid storage tank 15 through the sulfuric acid collecting pipe 12. In order to keep the graphite cooler 2 full of dilute sulfuric acid, to mix the concentrated sulfuric acid and water evenly, and to fully exchange heat in the cooling chamber, a part of the sulfuric acid collecting pipe 12 is arranged to be higher than the sulfuric acid outlet of the graphite cooler 2. The sulfuric acid collecting pipe 12 acts as a buffer between the graphite cooler 2 and the dilute sulfuric acid storage tank 15. If the sulfuric acid collecting pipe 12 is lower than the sulfuric acid outlet of the graphite cooler 2 as a whole, the diluted sulfuric acid flows directly to the dilute sulfuric acid storage tank 15 through the sulfuric acid collecting pipe 12. There may be air in the graphite cooler 2, and the heat of the diluted sulfuric acid has not been fully removed before entering the dilute sulfuric acid storage tank 15, which will cause the temperature of the dilute sulfuric acid storage tank 15 to be too high.

[0034] Since the sulfuric acid collecting pipe 12 is partially higher than the sulfuric acid outlet of the graphite cooler 2, this will cause the sulfuric acid after configuration to be retained in the graphite cooler 2 and cannot be completely transported to the dilute sulfuric acid storage tank 15. In order to avoid the above problems, Figure 2 and Figure 3 As shown, the sulfuric acid collecting pipe 12 includes a front pipe section 121, two rotary joints 122, a liquid level regulating pipe section 123 and a rear pipe section 124; wherein the front pipe section 121 is arranged horizontally and is connected to the sulfuric acid outlet of the graphite cooler 2; the rear pipe section 124 is arranged horizontally and is coaxial with the front pipe section 121; the rear pipe section 124 is directly or through a vertical pipeline connected to the dilute sulfuric acid storage tank 15. The liquid level regulating pipe section 123 is in the shape of a "J", and its two ends are connected and communicated with the front pipe section 121 and the rear pipe section 124 through the rotary joint 122 respectively. The lower end of the liquid level regulating pipe section 123 is fixedly connected with an adjusting shaft 125, and the adjusting shaft 125 can be a hollow shaft or a solid shaft, which can be selected according to actual needs. The adjusting shaft 125 is coaxial with the front pipe section 121, and the adjusting shaft 125 is adjustably mounted on the bracket 128. Specifically, a lower shaft seat 127 is fixed on the bracket 128, and an upper shaft seat 126 is detachably mounted on the lower shaft seat 127; the upper shaft seat 126 is connected to the lower shaft seat 127 by bolts, and the adjusting shaft 125 is located between the upper shaft seat 126 and the lower shaft seat 127. The adjusting shaft 125 can be released or locked by adjusting the bolts.

[0035] According to actual use needs, the height between the highest point of the sulfuric acid collecting tube 12 and the sulfuric acid outlet of the graphite cooler 2 can be adjusted by using the adjusting shaft 125, so as to adjust the liquid level height in the graphite cooler 2. At the same time, when the graphite cooler 2 needs to be emptied, the adjusting shaft 125 can also be used to adjust the sulfuric acid collecting tube 12 to a horizontal state, so that the graphite cooler 2 can be emptied to avoid liquid retention.

[0036] An auxiliary tightening bolt 129 is also threadedly connected to the upper shaft seat 126 . The auxiliary tightening bolt 129 passes through the upper shaft seat 126 and abuts against the adjusting shaft 125 .

[0037] The dilute sulfuric acid storage tank 15 is also connected to a dilute sulfuric acid supply pipeline 16, a dilute sulfuric acid reflux pipe 17 and a pressure regulating pipe 8. A pump body is arranged on the dilute sulfuric acid supply pipeline 16. The dilute sulfuric acid reflux pipe 17 is connected to the dilute sulfuric acid supply pipeline 16 at the downstream side of the pump body. The pressure regulating pipe 8 is connected to the vent pipe 3 and shares a pressure regulating module with the graphite cooler 2.

[0038] In addition, each pipeline may be provided with a flow meter, a valve body, etc., and the flow meter and the valve body may be provided according to actual needs. For example, both the negative pressure prevention tube 9 and the positive pressure prevention tube 10 are provided with an automatic valve body with controllable switch, the vent tube 3 and the connecting end of the graphite cooler 2 and the pressure regulating tube 8 are provided with a valve body, and a pressure detection element is provided in the graphite cooler 2 and the dilute sulfuric acid storage tank 15. When it is detected that the pressure does not meet the set requirements, the corresponding gas circuit is controlled to open to adjust the pressure in the graphite cooler 2 and the dilute sulfuric acid storage tank 15.

[0039] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A sulfuric acid preparation system, characterized in that: It includes a graphite cooler (2), a dilute sulfuric acid storage tank (15) and a pressure regulating module; The mixed acid chamber of the graphite cooler (2) is connected to a concentrated sulfuric acid pipeline (1), a vent pipe (3) and a fresh water pipeline (4); concentrated sulfuric acid is input into the graphite cooler (2) through the concentrated sulfuric acid pipeline (1), water is input into the graphite cooler (2) through the fresh water pipeline (4), and the vent pipe (3) is connected to the pressure regulating module; The dilute sulfuric acid storage tank (15) is connected to the vent pipe (3) through a pressure regulating pipe (8); The pressure regulating module includes a negative pressure prevention tank (13), a positive pressure prevention tank (14), a negative pressure prevention pipe (9) and a positive pressure prevention pipe (10); The air outlet of the negative pressure prevention tank (13) is connected to the vent pipe (3) through the negative pressure prevention pipe (9). The negative pressure prevention tank (13) is provided with a negative pressure tank water supply pipe (6) and a negative pressure intake pipe (18). The negative pressure tank water supply pipe (6) is connected to the fresh water pipeline (4), and both the negative pressure tank water supply pipe (6) and the negative pressure intake pipe (18) extend below the liquid level of the negative pressure prevention tank (13); The air inlet of the positive pressure prevention tank (14) is connected to the vent pipe (3) through the positive pressure prevention pipe (10). The positive pressure prevention tank (14) is connected to the fresh water pipeline (4) through a positive pressure tank water supply pipe (5). Both the positive pressure tank water supply pipe (5) and the positive pressure prevention pipe (10) extend below the liquid level of the positive pressure prevention tank (14); The graphite cooler (2) is also connected to a circulating water inlet pipeline (11) and a circulating water outlet pipeline (7); The bottom of the graphite cooler (2) is provided with a sulfuric acid outlet, which is higher than the dilute sulfuric acid storage tank (15). The diluted sulfuric acid flows to the dilute sulfuric acid storage tank (15) through a sulfuric acid collection pipe (12).

2. A sulfuric acid preparation system as claimed in claim 1, characterized in that: A detection port is provided on the circulating water outlet pipeline (7) for detecting the pH value of the circulating water.

3. A sulfuric acid preparation system as claimed in claim 1, characterized in that: A part of the sulfuric acid collection pipe (12) is higher than the sulfuric acid outlet of the graphite cooler (2).

4. A sulfuric acid preparation system as claimed in claim 3, characterized in that: The sulfuric acid collection pipe (12) includes a front pipe section (121), two rotary joints (122), a liquid level adjustment pipe section (123) and a rear pipe section (124); the front pipe section (121) is horizontally arranged and connected to the sulfuric acid outlet of the graphite cooler (2); the rear pipe section (124) is horizontally arranged and coaxial with the front pipe section (121); the liquid level adjustment pipe section (123) is in a "ji" shape, and its two ends are respectively connected and communicated with the front pipe section (121) and the rear pipe section (124) through the rotary joints (122); a regulating shaft (125) is fixedly connected to the lower end of the liquid level adjustment pipe section (123), the regulating shaft (125) is coaxial with the front pipe section (121), and the regulating shaft (125) is adjustably installed on a bracket (128).

5. A sulfuric acid preparation system as claimed in claim 4, characterized in that: A lower shaft seat (127) is fixed on the bracket (128), and an upper shaft seat (126) is detachably installed on the lower shaft seat (127); the regulating shaft (125) is located between the upper shaft seat (126) and the lower shaft seat (127), and the regulating shaft (125) can be released or locked by adjusting the upper shaft seat (126).

6. A sulfuric acid preparation system as claimed in claim 5, characterized in that: An auxiliary tightening bolt (129) is threadedly connected to the upper shaft seat (126); the auxiliary tightening bolt (129) passes through the upper shaft seat (126) and abuts against the adjustment shaft (125).

7. A sulfuric acid preparation system as claimed in claim 5, characterized in that: The dilute sulfuric acid storage tank (15) is also connected to a dilute sulfuric acid supply pipeline (16) and a dilute sulfuric acid reflux pipe (17). A pump body is arranged on the dilute sulfuric acid supply pipeline (16). The position where the dilute sulfuric acid reflux pipe (17) is connected to the dilute sulfuric acid supply pipeline (16) is located on the downstream side of the pump body.

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