Concentrated sulfuric acid dilution system

Abstract

The utility model provides a concentrated sulfuric acid dilution system which comprises a first sulfuric acid tank connected with a concentrated sulfuric acid inflow pipeline and a concentrated sulfuric acid outflow pipeline. A first self-control switch valve is arranged on the concentrated sulfuric acid inflow pipeline; a second sulfuric acid tank; the sulfuric acid diluter is connected between the first sulfuric acid tank and the second sulfuric acid tank, and sulfuric acid flows into the sulfuric acid diluter from the first sulfuric acid tank and then flows into the second sulfuric acid tank; a first sulfuric acid inlet pipeline is connected between the concentrated sulfuric acid inflow pipeline and the sulfuric acid diluter; the controller is connected with the first self-control switch valve; the weighing module is arranged at the bottom of the first sulfuric acid tank, the weighing module is electrically connected with the controller, and the controller receives a signal of the weighing module to judge whether sulfuric acid needs to be added into the first sulfuric acid tank or not, so that the first self-control switch valve is opened or closed, and the requirements for the liquid level and the quality of the sulfuric acid in the first sulfuric acid tank are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to sulfuric acid dilution technical field especially is related to a concentrated sulfuric acid dilution system. BACKGROUND

[0002] Sulfuric acid is a widely used raw material in chemical production process, and is a strong acid. In practical application, dilute sulfuric acid is often used, which is prepared by using concentrated sulfuric acid.

[0003] In the current production workshop, the method commonly used for diluting sulfuric acid is to dilute and prepare acid in a kettle. A certain amount of water is first added to the kettle, and concentrated sulfuric acid is slowly added dropwise into the kettle under the condition that the kettle jacket is cooled by low-temperature medium. Since the dilution and preparation of acid in the kettle require manual operation, the strong corrosive nature of concentrated sulfuric acid increases the risk of personnel injury during manual operation. In addition, the heat exchange area of the kettle jacket is limited, and the cooling capacity is limited. In order to ensure safety, concentrated sulfuric acid can only be added slowly, resulting in low production capacity. The kettle used for diluting concentrated sulfuric acid is usually made of glass lining material. Once the glass lining of the kettle is damaged during long-term use, concentrated sulfuric acid will immediately corrode the kettle, damaging the equipment. In severe cases, sulfuric acid leakage may occur, which has serious consequences.

[0004] In the current production device, a sulfuric acid diluter is often used to continuously prepare acid. However, during the use of the sulfuric acid diluter, the disadvantages of using a kettle to prepare sulfuric acid are solved. However, the stability of the sulfuric acid dilution system using the sulfuric acid diluter is not enough, the dilution of dilute sulfuric acid cannot be carried out stably and efficiently, the monitoring ability for abnormal conditions is not enough, and the system cannot alarm and automatically shut down in time, which has poor system safety. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a concentrated sulfuric acid dilution system to solve the technical problems of insufficient stability of the sulfuric acid dilution system in the prior art, inability to stably and efficiently dilute dilute sulfuric acid, insufficient monitoring ability for abnormal conditions, inability to alarm and automatically shut down the system in time, and poor system safety.

[0006] The concentrated sulfuric acid dilution system according to the present application comprises: a first sulfuric acid tank, the first sulfuric acid tank being connected with a concentrated sulfuric acid inflow pipeline and a concentrated sulfuric acid outflow pipeline; a first automatic control on-off valve being arranged on the concentrated sulfuric acid inflow pipeline; a second sulfuric acid tank;

[0007] A sulfuric acid diluter is connected between the first sulfuric acid tank and the second sulfuric acid tank. Sulfuric acid flows from the first sulfuric acid tank into the sulfuric acid diluter and then into the second sulfuric acid tank. A first sulfuric acid inlet pipeline is connected between the concentrated sulfuric acid inflow pipeline and the sulfuric acid diluter. A controller is connected with the first automatic control on-off valve. A weighing module is arranged at the bottom of the first sulfuric acid tank, and the weighing module is electrically connected with the controller.

[0008] In some embodiments of the present application, the concentrated sulfuric acid inflow pipeline comprises a first flow meter, which is electrically connected with the controller.

[0009] In some embodiments of the present application, a liquid level switch is arranged on the first sulfuric acid tank, which is electrically connected with the controller.

[0010] In some embodiments of the present application, a second flow meter is arranged on the first sulfuric acid inflow pipeline, and a second automatic on-off valve is arranged on the concentrated sulfuric acid outflow pipeline, and the second flow meter and the second automatic on-off valve are electrically connected with the controller.

[0011] According to the concentrated sulfuric acid dilution system of the present application, the system comprises a first sulfuric acid tank and a second sulfuric acid tank; a sulfuric acid diluter connected between the first sulfuric acid tank and the second sulfuric acid tank, through which the sulfuric acid flows from the first sulfuric acid tank to the second sulfuric acid tank; the first sulfuric acid tank is connected with a concentrated sulfuric acid inflow pipeline and a concentrated sulfuric acid outflow pipeline, the concentrated sulfuric acid outflow pipeline comprises a second automatic on-off valve and a liquid pump; a first sulfuric acid inflow pipeline is connected between the output end of the liquid pump and the sulfuric acid diluter, and the first sulfuric acid inflow pipeline comprises a third automatic on-off valve, a second flow meter and a first automatic regulating valve; a controller is electrically connected with the second automatic on-off valve, the liquid pump, the third automatic on-off valve, the second flow meter and the first automatic regulating valve, respectively.

[0012] In some embodiments of the present application, the sulfuric acid diluter is connected with the output end of a first water inflow pipeline, the first water inflow pipeline comprises a third flow meter, a fourth automatic on-off valve and a second automatic regulating valve, and the third flow meter, the fourth automatic on-off valve and the second automatic regulating valve are electrically connected with the controller, respectively.

[0013] In some embodiments of the present application, the sulfuric acid diluter comprises a mixing chamber and a condenser, and a temperature sensor is arranged on the mixing chamber, and the temperature sensor is electrically connected with the controller.

[0014] In some embodiments of the present application, the sulfuric acid diluter is connected with a circulating water supply pipeline and a circulating water return pipeline, respectively; a circulating water automatic on-off valve is arranged on the circulating water supply pipeline, and the circulating water automatic on-off valve is electrically connected with the controller; a pH meter and / or an electric conductivity meter are arranged on the circulating water return pipeline, and the pH meter / electric conductivity meter is electrically connected with the controller.

[0015] In some embodiments of the present application, a diluted sulfuric acid discharge pipeline is connected between the sulfuric acid diluter and the second sulfuric acid tank, and the diluted sulfuric acid discharge pipeline further comprises a sulfuric acid concentration meter, which is connected with the controller.

[0016] In some embodiments of the present application, an alarm module is further included, which is electrically connected with the controller.

[0017] The concentrated sulfuric acid dilution system of the present application has at least the following positive effects:

[0018] The utility model provides a kind of concentrated sulphuric acid dilution system, including first sulphuric acid tank, first sulphuric acid tank is connected with concentrated sulphuric acid inflow pipeline and concentrated sulphuric acid outflow pipeline;Concentrated sulphuric acid inflow pipeline is equipped with first automatic control switch valve;Second sulphuric acid tank;Sulphuric acid diluter, it is connected between first sulphuric acid tank and second sulphuric acid tank, sulphuric acid flows into second sulphuric acid tank after flowing into sulphuric acid diluter from first sulphuric acid tank;Concentrated sulphuric acid inflow pipeline and sulphuric acid diluter are connected with first sulphuric acid inlet pipeline;Controller is connected with first automatic control switch valve;Weighing module, it is equipped in the bottom of first sulphuric acid tank, weighing module is electrically connected with controller, and controller receives the signal of weighing module, to judge whether first sulphuric acid tank needs to increase sulphuric acid, to make the opening or closing of first automatic control switch valve, to meet the liquid level and mass demand of sulphuric acid in first sulphuric acid tank, to make concentrated sulphuric acid dilution system more stable operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the following will be briefly introduced the drawings needed to be used in specific embodiment or prior art description, obviously, the drawings in the following description is some embodiments of the utility model, for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings.

[0020] Figure 1 System principle diagram of sulphuric acid dilution automatic control system provided for the embodiment of the utility model;

[0021] Figure 2 System principle diagram of sulphuric acid diluter part of sulphuric acid dilution automatic control system provided for the embodiment of the utility model;

[0022] Icon: 11, first sulphuric acid tank;12, second sulphuric acid tank;13, sulphuric acid diluter;2, controller;3, weighing module;4, concentrated sulphuric acid inflow pipeline;41, first flowmeter;42, first automatic control switch valve;5, concentrated sulphuric acid outflow pipeline;51, second automatic control switch valve;52, Y type filter;53, liquid pump;6, first sulphuric acid inlet pipeline;61, pressure transmitter;62, first check valve;63, third automatic control switch valve;64, second flowmeter;65, first automatic control regulating valve;7, first water inlet pipeline;71, third flowmeter;72, second automatic control regulating valve;73 second check valve;74, fourth automatic control switch valve;8, dilute sulphuric acid discharge pipeline;81, temperature transmitter;82, sulphuric acid concentration meter;91, circulating water supply pipeline;911, circulating water automatic control switch valve;92, circulating water return pipeline;922, PH meter. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be described clearly and completely below in connection with the embodiments. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0024] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0025] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second", "third" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0026] In the current production workshop, the method commonly used for diluting sulfuric acid is to dilute and prepare acid with a kettle or a sulfuric acid diluter 13. Since the dilution and preparation of acid with a kettle requires manual operation, there are many safety hazards, and the heat exchange area of the kettle jacket is limited, the dropping speed of the prepared acid is limited, and when the kettle used is damaged, there is a risk of leakage due to corrosion of sulfuric acid. In the current production device, a sulfuric acid diluter 13 is also often used to continuously prepare acid. However, in the process of using the sulfuric acid diluter 13, many shortcomings of using a kettle to prepare sulfuric acid are solved, but the stability of the sulfuric acid dilution system using the sulfuric acid diluter 13 is not enough, the dilution of dilute sulfuric acid cannot be carried out stably and efficiently, the monitoring capability for abnormal conditions is not enough, and the system cannot alarm and automatically cut off the system in time, so the system safety is poor.

[0027] Reference Figure 1 and Figure 2 The sulfuric acid dilution automatic control system of the application comprises a first sulfuric acid tank 11, a concentrated sulfuric acid inflow pipeline 4 and a concentrated sulfuric acid outflow pipeline 5 are connected to the first sulfuric acid tank 11; a first automatic control switch valve 42 is arranged on the concentrated sulfuric acid inflow pipeline 4; a second sulfuric acid tank 12; a sulfuric acid diluter 13 is connected between the first sulfuric acid tank 11 and the second sulfuric acid tank 12, and the sulfuric acid flows from the first sulfuric acid tank 11 into the sulfuric acid diluter 13 and then flows into the second sulfuric acid tank 12; a first sulfuric acid inlet pipeline 6 is connected between the concentrated sulfuric acid inflow pipeline 4 and the sulfuric acid diluter 13; a controller 2 is connected with the first automatic control switch valve 42; a weighing module 3 is arranged at the bottom of the first sulfuric acid tank 11, and the weighing module 3 is electrically connected with the controller 2, and the controller 2 receives the signal of the weighing module 3 to determine whether the first sulfuric acid tank 11 needs to increase sulfuric acid, so as to open or close the first automatic control switch valve 42, so as to meet the liquid level and mass requirements of the sulfuric acid in the first sulfuric acid tank 11, and make the concentrated sulfuric acid dilution system run more stably.

[0028] The prior art sulfuric acid dilution control system does not have a weighing module 3, so that the capacity of the sulfuric acid in the sulfuric acid tank cannot be accurately measured, and the sulfuric acid cannot be supplemented in time. The controller 2 of the application receives the signal of the weighing module 3 to determine whether the first sulfuric acid tank 11 needs to increase sulfuric acid, so as to open or close the first automatic control switch valve 42, so as to meet the liquid level and mass requirements of the sulfuric acid in the first sulfuric acid tank 11, and make the concentrated sulfuric acid dilution system run more stably.

[0029] The sulfuric acid dilution system of the application comprises a first sulfuric acid tank 11 and a second sulfuric acid tank 12; a sulfuric acid diluter 13 is connected between the first sulfuric acid tank 11 and the second sulfuric acid tank 12, and the sulfuric acid flows from the first sulfuric acid tank 11 into the sulfuric acid diluter 13 and then flows into the second sulfuric acid tank 12; the first sulfuric acid tank 11 is connected with a concentrated sulfuric acid inflow pipeline 4 and a concentrated sulfuric acid outflow pipeline 5, and the concentrated sulfuric acid outflow pipeline 5 comprises a second automatic control switch valve 51 and a liquid pump 53; a first sulfuric acid inlet pipeline 6 is connected between the output end of the liquid pump 53 and the sulfuric acid diluter 13, and comprises a third automatic control switch valve 63, a second flow meter 64 and a first automatic control regulating valve 65; a controller 2 is electrically connected with the second automatic control switch valve 51, the liquid pump 53, the third automatic control switch valve 63, the second flow meter 64 and the first automatic control regulating valve 65 respectively, and the controller 2 is configured to: according to the opening state of the third automatic control switch valve 63, the detected flow of the second flow meter 64 and the opening state of the first automatic control regulating valve 65, control the opening state of the second automatic control switch valve 51 and the opening state of the liquid pump 53, so that the sulfuric acid flow on the first sulfuric acid inlet pipeline 6 reaches a preset value, thereby realizing accurate control of the sulfuric acid flow into the sulfuric acid diluter 13. Compared with the prior art, the inflow amount of water and sulfuric acid in the sulfuric acid diluter 13 is accurately controlled, and the system runs more stably.

[0030] A concentrated sulfuric acid dilution system provided by the utility model is described in detail below, comprising a first sulfuric acid tank 11, a sulfuric acid diluter 13, a second sulfuric acid tank 12 and a controller 2. Among them, the concentration of sulfuric acid in the first sulfuric acid tank 11 is higher than that in the second sulfuric acid tank 12, the concentrated sulfuric acid flows out from the first sulfuric acid tank 11, and then is diluted by the sulfuric acid diluter 13 and flows into the second sulfuric acid tank 12.

[0031] The sulfuric acid dilution device comprises a weighing module 3, which is placed at the bottom of the first sulfuric acid tank 11 and is used for weighing the first sulfuric acid tank 11, so as to reflect the weight of the concentrated sulfuric acid in the first sulfuric acid tank 11. The weighing module 3 is electrically connected with the controller 2.

[0032] In some embodiments, a handle or a lifting lug is arranged on the first sulfuric acid tank 11, so that the user can lift the first sulfuric acid tank 11 and place it on the weighing module 3, thereby facilitating the installation or maintenance of the weighing module 3.

[0033] The first sulfuric acid tank 11 is connected with a concentrated sulfuric acid inflow pipeline 4 and a concentrated sulfuric acid outflow pipeline 5, the concentrated sulfuric acid enters the first sulfuric acid tank 11 through the concentrated sulfuric acid inflow pipeline 4, and then is discharged to the water pump through the concentrated sulfuric acid outflow pipeline 5.

[0034] The concentrated sulfuric acid inflow pipeline 4 comprises a first flow meter 41, a first automatic control on-off valve 42 and a pipeline, the first automatic control on-off valve 42 controls the opening and closing of the concentrated sulfuric acid inflow pipeline 4, and the first flow meter 41 measures the flow of the concentrated sulfuric acid in the concentrated sulfuric acid inflow pipeline 4.

[0035] Optionally, the first automatic control on-off valve 42 is connected with the controller 2, and the valve is opened or closed according to the electric signal sent by the controller 2, so as to realize the opening and closing of the concentrated sulfuric acid inflow pipeline 4.

[0036] Optionally, the first flow meter 41 is connected with the controller 2, so as to transmit a signal to the controller 2.

[0037] Optionally, the first flow meter 41 and the first automatic control on-off valve 42 are arranged in sequence along the flow direction of the concentrated sulfuric acid in the concentrated sulfuric acid inflow pipeline 4.

[0038] The concentrated sulfuric acid outflow pipeline 5 comprises a second automatic control on-off valve 51, a Y-shaped filter, a liquid pump 53 and a pipeline.

[0039] Optionally, the second automatic control on-off valve 51, the Y-shaped filter and the liquid pump 53 are arranged in sequence along the flow direction of the sulfuric acid on the concentrated sulfuric acid outflow pipeline 5.

[0040] The second automatic control on-off valve 51 is electrically connected with the controller 2, and controls the opening and closing of the concentrated sulfuric acid outflow pipeline 5. The Y-shaped filter 52 is used for filtering the sulfuric acid to be entered into the liquid pump 53. The liquid pump 53 is used for providing the flow energy of the concentrated sulfuric acid.

[0041] Optionally, the liquid pump 53 is electrically connected with the controller 2, so that the controller 2 controls the start and stop of the liquid pump 53. In some embodiments, the liquid pump 53 is a fluorine-lined magnetic pump, which can effectively reduce the corrosiveness of sulfuric acid to the pump body, reduce the risk of sulfuric acid leakage, enhance the stability of sulfuric acid flow, and ensure that the sulfuric acid can flow stably when flowing through the liquid pump 53.

[0042] Optionally, two liquid pumps 53 are provided for each concentrated sulfuric acid tank, one of which is connected for normal use, and the other is used as a backup.

[0043] The first sulfuric acid tank 11 is also provided with a liquid level switch for monitoring the liquid level in the first sulfuric acid tank 11. Optionally, the liquid level switch is electrically connected with the controller 2 to transmit the liquid level signal to the controller 2, facilitating personnel monitoring of the liquid level.

[0044] The first sulfuric acid tank 11 is also provided with an exhaust pipeline, which is bent and extends downward to a distance of 0.5 m from the ground, so that the sulfuric acid sprayed from the exhaust pipeline is discharged towards the ground, reducing the probability of people being injured by the sulfuric acid discharged from the exhaust pipeline.

[0045] The sulfuric acid diluter 13 is connected with the first sulfuric acid inlet pipeline 6, and the concentrated sulfuric acid enters the sulfuric acid diluter 13 from the first sulfuric acid inlet pipeline 6.

[0046] The first sulfuric acid inlet pipeline 6 is connected with the output end of the concentrated sulfuric acid outlet pipeline 5, and the first sulfuric acid inlet pipeline 6 includes a first check valve 62, a third automatic on-off valve 63, a second flow meter 64, a first automatic regulating valve 65, and a pipeline.

[0047] Optionally, the first check valve 62, the third automatic on-off valve 63, the second flow meter 64, and the first automatic regulating valve 65 are arranged in sequence along the direction of sulfuric acid flow on the first sulfuric acid inlet pipeline 6.

[0048] The first check valve 62 is used to limit the flow direction of the concentrated sulfuric acid, so that the sulfuric acid can only flow into the sulfuric acid diluter 13 along the first sulfuric acid inlet pipeline 6, and the backflow of the sulfuric acid from the sulfuric acid diluter 13 to the liquid pump 53 is prevented.

[0049] The third automatic on-off valve 63 is electrically connected with the controller 2, and the controller 2 sends a signal to the third automatic on-off valve 63 to open and close the first sulfuric acid inlet pipeline 6.

[0050] The second flow meter 64 is used to measure the flow of sulfuric acid entering the sulfuric acid diluter 13 from the first sulfuric acid inlet pipeline 6, so as to facilitate the regulation of the flow entering the sulfuric acid diluter 13.

[0051] The first self-regulating valve 65 is connected with the controller 2, and the opening of the first self-regulating valve 65 is adjusted according to the signal sent by the controller 2, so as to increase or reduce the flow of concentrated sulfuric acid in the first sulfuric acid inlet pipeline 6.

[0052] Optionally, the input end of the first sulfuric acid inlet pipeline 6 is connected with the output end of the liquid pump 53, and a pressure transmitter 61 is further arranged on the first sulfuric acid inlet pipeline 6, which is connected at a position close to the outlet of the liquid pump 53 and can detect the pressure at the outlet of the liquid pump 53. The pressure transmitter 61 is also connected with the controller, and the controller 2 judges whether the liquid pump 53 is in idle running according to the pressure detected by the pressure transmitter 61, thereby protecting the liquid pump 53.

[0053] The sulfuric acid diluter 13 comprises a mixing chamber and a condenser, and the mixing chamber is located above the condenser. Optionally, the condenser is a graphite condenser.

[0054] The mixing chamber is used for mixing concentrated sulfuric acid and water to generate a sulfuric acid solution with lower concentration. The condenser is arranged below the mixing chamber to cool the sulfuric acid and provide cold energy to cool the diluted sulfuric acid.

[0055] The mixing chamber is connected with the first sulfuric acid inlet pipeline 6 and the first water inlet pipeline 7, and the sulfuric acid in the first sulfuric acid inlet pipeline 6 enters the mixing chamber to mix with the water in the first water inlet pipeline 7.

[0056] The water inlet end of the first water inlet pipeline 7 is connected with a water source, and the water outlet end is connected with the mixing chamber, and the first water inlet pipeline 7 comprises a third flow meter 71, a second self-regulating valve 72, a second check valve 73, a fourth self-regulating on-off valve 74 and a pipeline.

[0057] Optionally, the third flow meter 71, the second self-regulating valve 72, the second check valve 73 and the fourth self-regulating on-off valve 74 are arranged in sequence along the direction of water flow on the first water inlet pipeline 7.

[0058] Specifically, the third flow meter 71 is used for measuring the flow of water flowing from the first water inlet pipeline 7 into the mixing chamber. The second self-regulating valve 72 is connected with the controller 2 and can receive the signal of the controller 2 to adjust the opening, so as to reduce or increase the flow of water in the first water inlet pipeline 7. Water can only flow to the sulfuric acid diluter 13 through the second check valve 73 and cannot flow back from the sulfuric acid diluter 13 to the water source. The fourth self-regulating on-off valve 74 is connected with the controller 2, and the controller 2 sends a signal to open or close the fourth self-regulating on-off valve 74.

[0059] The mixing chamber and the graphite condenser are respectively provided with a venting port and a complete emptying port, so that the circulating water can be completely emptied when the sulfuric acid diluter 13 is stopped, thereby preventing the graphite condenser from being frozen and cracked in winter.

[0060] The graphite condenser is connected with the diluted sulfuric acid discharge pipeline 8. The diluted sulfuric acid discharge pipeline 8 comprises a temperature transmitter 81 and a sulfuric acid concentration meter 82. The temperature transmitter 81 and the sulfuric acid concentration meter are connected with the controller 2.

[0061] The temperature transmitter 81 and the sulfuric acid concentration meter 82 are arranged in sequence along the flow direction of the sulfuric acid on the diluted sulfuric acid discharge pipeline 8. The sulfuric acid concentration meter 82 is connected with the controller 2, and is used to detect the concentration of the diluted sulfuric acid. When the detected concentration is lower than a preset value, an alarm is immediately given to remind whether the condenser is leaking.

[0062] (The control method during the feeding process of the first sulfuric acid tank 11)

[0063] The controller 2 is configured to send a signal to the first automatic development valve to open when the weight detected by the weighing module 3 is less than a preset weight value, so that the concentrated sulfuric acid enters the first sulfuric acid tank 11. When the weight detected by the weighing module 3 is greater than or equal to the preset weight value, the first automatic development valve is closed. This control method realizes the automatic feeding of the first sulfuric acid tank 11.

[0064] The controller 2 is further configured to obtain the flow mass G1 of the first sulfuric acid tank 11 through the first flow meter 41 when the first automatic development valve is opened, and simultaneously obtain the sulfuric acid mass G2 of the first sulfuric acid tank 11 through the weighing module 3. When G1 and G2 are not equal, a signal is sent to the alarm module to alarm that there is a risk of leaking sulfuric acid.

[0065] The controller 2 is further configured to obtain the flow mass G3 of the first sulfuric acid tank 11 through the liquid level switch when the first automatic development valve is opened, and simultaneously obtain the sulfuric acid mass G2 of the first sulfuric acid tank 11 through the weighing module 3. When G3 and G2 are not equal, a signal is sent to the alarm module to alarm that there is a risk of leaking sulfuric acid.

[0066] (The control method during the sulfuric acid dilution process)

[0067] The controller 2 is configured to control the opening state of the second automatic development valve 51 and the opening state of the liquid pump 53 according to the opening state of the third automatic development valve 63, the flow detected by the second flow meter 64 and the opening state of the first automatic development valve 65, so that the flow of the sulfuric acid on the first sulfuric acid feeding pipeline 6 reaches a preset value, thereby realizing accurate control of the flow of the sulfuric acid entering the sulfuric acid diluter 13.

[0068] The controller 2 is further configured to: when the second automatic on-off valve 51 is opened, sulfuric acid enters the sulfuric acid diluter 13, the mass G4 of the sulfuric acid entering the sulfuric acid diluter 13 is obtained by the second flow meter 64, and at the same time the mass G5 of the sulfuric acid flowing out of the first sulfuric acid tank 11 is obtained by the weighing module 3, when G4 and G5 are not equal, a signal is sent to the alarm module to alarm and remind that there is a risk of sulfuric acid leakage, and at the same time the second automatic on-off valve 51 is closed to stop the sulfuric acid from flowing out of the first sulfuric acid tank 11, thereby reducing the amount of sulfuric acid leakage.

[0069] The controller 2 is configured to: when the fourth automatic on-off valve 74 is opened, the first water inlet pipeline 7 starts to inlet water, and the opening degree of the second automatic regulating valve 72 is adjusted according to the water flow value detected by the third flow meter 71 and the preset dilution concentration of concentrated sulfuric acid, so that the flow and flow rate of the inlet water can meet the requirements.

[0070] The controller 2 is configured to: when the fourth automatic on-off valve 74 is opened, the first water inlet pipeline 7 starts to inlet water, and the ratio A of the flow value obtained by the third flow meter 71 and the flow value obtained by the second flow meter 64 is calculated, and the relationship between A and the preset ratio A0 is judged, if A is less than A0, a signal is sent to the alarm module to alarm and remind to check whether the condenser is leaking.

[0071] The controller 2 is configured to: when the sulfuric acid is not diluted, a signal is sent to the second automatic regulating valve 72 to adjust the opening degree to 0, and a signal is sent to the fourth automatic on-off valve 74 to cut off the first water inlet circuit, thereby reducing the internal leakage due to the poor sealing of the second automatic regulating valve 72.

[0072] In some embodiments, a temperature sensor is arranged at the upper end of the mixing chamber for detecting the temperature in the mixing chamber. The temperature sensor is connected to the controller 2 to transmit signals to the controller 2.

[0073] The controller 2 is configured to: when the temperature sensor detects that the temperature T1 of the mixing chamber is greater than the preset temperature value T01, a signal is sent to adjust the opening degree of the first automatic regulating valve 65 on the first sulfuric acid inlet pipeline 6 to be smaller, so that the inlet flow of the sulfuric acid becomes smaller and the feeding speed becomes lower; if the temperature T1 of the mixing chamber is greater than the preset temperature value T100, at this time the temperature of the mixing chamber has reached the upper limit that can normally dilute the sulfuric acid, and the sulfuric acid dilution cannot continue, the controller 2 sends a signal to the third automatic on-off valve 63 to cut off the first sulfuric acid inlet pipeline 6.

[0074] In some embodiments, a temperature transmitter 81 is arranged on the diluted sulfuric acid discharge pipeline 8 for detecting the temperature of the diluted sulfuric acid.

[0075] The controller 2 is configured to: when the temperature transmitter 81 detects that the temperature T2 of the diluted sulfuric acid > the preset temperature value T02, signal to reduce the opening of the first self-regulating valve 65 on the first sulfuric acid inlet pipeline 6, so that the inlet flow of sulfuric acid becomes smaller, and the feeding speed becomes lower; if the temperature T2 of the mixing chamber > the preset temperature value T200, at this time the temperature of the mixing chamber has reached the upper limit that can normally dilute sulfuric acid, and the dilution of sulfuric acid cannot continue, the controller 2 sends a signal to the third self-regulating switch valve 63 to shut off the first sulfuric acid inlet pipeline 6.

[0076] The mixing chamber and the graphite condenser are respectively connected to the circulating water supply pipeline 91 and the circulating water return pipeline 92. The circulating water supply pipeline 91 is connected to a water source. Water from the circulating water supply pipeline 91 enters the mixing chamber and the graphite condenser to absorb the heat generated during the dilution of sulfuric acid, thereby reducing the temperature of the sulfuric acid in the mixing chamber and the graphite condenser. The water after absorbing heat flows back to the water source through the circulating water return pipeline 92.

[0077] The circulating water supply pipeline 91 is provided with a circulating water self-regulating switch valve 911 connected to the controller 2. The circulating water return pipeline 92 is provided with a pH meter 922 / conductivity meter connected to the controller 2.

[0078] The controller 2 is configured to receive the signal of the pH meter 922 / conductivity meter, judge the relationship between the detection value Q1 of the pH meter 922 / conductivity meter and the preset value Q0, and if Q1 > Q0, send a signal to the alarm module to alarm and remind to check whether the sulfuric acid in the condenser is leaking, and at the same time send a signal to the circulating water self-regulating switch valve 911 to close the circulating water supply pipeline 91.

[0079] Since the first sulfuric acid tank 11 contains high-concentration sulfuric acid, and the concentrated sulfuric acid outlet pipeline 5 of the first sulfuric acid tank 11 is connected to the liquid pump 53, if the liquid in the first sulfuric acid tank 11 is less, it will affect the normal use of the liquid pump 53.

[0080] The controller 2 is configured to receive the weight G2 of the sulfuric acid in the first sulfuric acid tank 11 detected by the weighing module 3, judge the relationship between G2 and the preset value G20, and if G2 < G20, send a signal to the alarm module to alarm and remind that the sulfuric acid in the first sulfuric acid tank 11 is insufficient, and at the same time send a signal to the second self-regulating switch valve 51 to close it, and at the same time send a signal to the liquid pump 53 to stop running, so as to reduce the probability of pump damage.

Claims

1. A concentrated sulfuric acid dilution system characterized by, include: a first sulfuric acid tank, connected to a concentrated sulfuric acid inflow pipeline and a concentrated sulfuric acid outflow pipeline; a first automatic on-off valve is provided on the concentrated sulfuric acid inflow pipeline; Second sulfuric acid tank; a sulfuric acid diluter connected between the first sulfuric acid tank and the second sulfuric acid tank, wherein sulfuric acid flows from the first sulfuric acid tank into the sulfuric acid diluter and then into the second sulfuric acid tank; a first sulfuric acid inlet pipeline is connected between the concentrated sulfuric acid inlet pipeline and the sulfuric acid diluter; a controller connected to the first automatic switching valve; A weighing module is provided at the bottom of the first sulfuric acid tank, and the weighing module is electrically connected to the controller.

2. The concentrated sulfuric acid dilution system of claim 1, wherein, The concentrated sulfuric acid inflow pipeline includes a first flow meter, and the first flow meter is electrically connected to the controller.

3. The concentrated sulfuric acid dilution system of claim 1, wherein, The first sulfuric acid tank is provided with a liquid level switch, and the liquid level switch is electrically connected to the controller.

4. The concentrated sulfuric acid dilution system of claim 1, wherein, A second flow meter is provided on the first sulfuric acid inlet pipeline, a second automatic switch valve is provided on the concentrated sulfuric acid outflow pipeline, and the second flow meter and the second automatic switch valve are electrically connected to the controller.

5. A concentrated sulfuric acid dilution system characterized by, include: a first sulfuric acid tank and a second sulfuric acid tank; a sulfuric acid diluter connected between the first sulfuric acid tank and the second sulfuric acid tank, wherein sulfuric acid flows from the first sulfuric acid tank into the sulfuric acid diluter and then into the second sulfuric acid tank; The first sulfuric acid tank is connected to a concentrated sulfuric acid inflow pipeline and a concentrated sulfuric acid outflow pipeline, and the concentrated sulfuric acid outflow pipeline includes a second automatic switch valve and a liquid pump; A first sulfuric acid inlet pipeline is connected between the output end of the liquid pump and the sulfuric acid diluter, and includes a third automatic switch valve, a second flow meter and a first automatic regulating valve; A controller is electrically connected to the second automatic switch valve, the liquid pump, the third automatic switch valve, the second flow meter and the first automatic regulating valve respectively.

6. The concentrated sulfuric acid dilution system of claim 5, wherein, The sulfuric acid diluter is connected to the output end of the first water inlet pipeline, and the first water inlet pipeline includes a third flow meter, a fourth automatic switch valve and a second automatic regulating valve. The third flow meter, the fourth automatic switch valve and the second automatic regulating valve are electrically connected to the controller respectively.

7. The concentrated sulfuric acid dilution system of claim 1 or 5, wherein, The sulfuric acid diluter includes a mixing chamber and a condenser. The mixing chamber is provided with a temperature sensor, and the temperature sensor is electrically connected to the controller.

8. The concentrated sulfuric acid dilution system of claim 1 or 5, wherein, The sulfuric acid diluter is respectively connected to a circulating water supply pipeline and a circulating water return pipeline; a circulating water automatic switch valve is provided on the circulating water supply pipeline, and the circulating water automatic switch valve is electrically connected to the controller; a pH meter and / or a conductivity meter is provided on the circulating water return pipeline, and the pH meter / the conductivity meter is electrically connected to the controller.

9. The concentrated sulfuric acid dilution system of claim 5, wherein, The diluted sulfuric acid discharge pipeline is connected between the sulfuric acid diluter and the second sulfuric acid tank. The diluted sulfuric acid discharge pipeline also includes a sulfuric acid concentration meter, which is connected to the controller.

10. The concentrated sulfuric acid dilution system of claim 1 or 2 or 3 or 4 or 5, wherein, It also includes an alarm module, which is electrically connected to the controller.

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