Negative pressure pumping system for negative pressure formation

Abstract

The utility model discloses a negative pressure pumping system for negative pressure formation, which comprises a negative pressure header pipe, and further comprises a separating tower which is divided into an acid liquor area positioned at the bottom and a gas area positioned at the top, and the acid liquor area and the gas area are separated by an activated carbon layer; the negative pressure header pipe is communicated with the acid liquid area, the communication position is higher than the liquid level of acid liquid collected at the bottom of the acid liquid area, a negative pressure outlet is formed in the side face of the gas area, a hydrogen outlet is formed in the top face of the gas area, and a hydrogen concentration detection sensor used for detecting hydrogen concentration is further arranged at the top of the gas area; the negative pressure pump is connected with the negative pressure outlet through a negative pressure pumping pipeline and is used for pumping negative pressure in the separation tower; the hydrogen discharging tower is connected with the hydrogen outlet through a hydrogen discharging pipeline, and an electromagnetic valve for controlling the hydrogen discharging pipeline to be opened and closed is arranged on the hydrogen discharging pipeline. According to the design and production safety of the system scheme, the independent hydrogen separation and centralized discharge system is designed, and the stability of safe operation of the system is ensured;

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a negative pressure extraction system for negative pressure formation. Background Art

[0002] Lead-acid battery is a storage battery whose electrodes are mainly made of lead and its oxides, and whose electrolyte is sulfuric acid solution. When the lead-acid battery is discharged, the lead dioxide at the positive electrode and the spongy lead at the negative electrode are converted into lead sulfate; when charged, the lead sulfate at the positive and negative electrodes are converted into lead dioxide and spongy lead respectively.

[0003] Formation is a key process in the production of lead-acid batteries. Through charging and discharging, the positive active material is converted into lead dioxide, and the negative active material is converted into spongy lead. There are two common formation methods, plate formation and battery formation. Plate formation, also known as tank formation and external formation, inserts the positive and negative raw plates alternately into the formation tank, and the plates of the same polarity are arranged on the same side to form a multi-pole positive and negative electrode group for charging and forming mature plates. The battery is assembled with the formed mature plates. Non-dry-charged batteries also need to go through the acid addition and charging process. Battery formation, also known as internal formation, also known as "cadmium-free internal formation process", is to directly assemble the battery after the solidified and dried battery plates are cut and then acid is added to the battery for charging to obtain the finished product. Since the internal formation process eliminates the discharge of acid wastewater generated by tank formation in the production process of lead-acid batteries, the internal formation process is more environmentally friendly than the external formation process, so the internal formation process is gradually promoted and used in lead-acid battery production plants.

[0004] Whether it is plate formation or battery formation, it needs to go through the acid addition and charging process. Acid addition is a process in which a sulfuric acid solution enters the battery from an acid adding machine through an acid adding pot. Valve-regulated lead-acid batteries usually use vacuum negative pressure technology for acid addition. In recent years, vacuum negative pressure technology has also been gradually adopted for battery formation processes. In order to make the internal formation effect better, it is best to use negative pressure formation technology during the internal formation process. Negative pressure formation technology refers to the battery being charged and formed in a closed environment with a large current, and using a vacuum pressure device to remove the heat and acid mist generated during the formation. During the internal formation process, it is best to use negative pressure to discharge the gas inside the lead-acid battery and add acid to the lead-acid battery. Lead-acid batteries produce acid mist and hydrogen during the charging and formation process. At present, the acid mist and hydrogen in the traditional battery formation process are collected and treated by environmental protection equipment. The battery charging process reacts to produce hydrogen, which is prone to spontaneous combustion. There are many cases of fires in the battery charging and formation area in the lead-acid battery industry, and the emission system of the generated hydrogen needs to be further improved. Utility Model Content

[0005] Based on the deficiencies in the prior art, the utility model provides a negative pressure extraction system for negative pressure formation, which can separate hydrogen and discharge it into a centralized system to ensure the stability of safe operation of the system.

[0006] The technical solution adopted by the utility model to achieve the above technical purpose is:

[0007] A negative pressure extraction system for negative pressure formation, comprising a negative pressure main pipe, and further comprising:

[0008] A separation tower, divided into an acid liquid zone at the bottom and a gas zone at the top, the acid liquid zone and the gas zone are separated by an activated carbon layer, the negative pressure main pipe is connected to the acid liquid zone and the connection position is higher than the liquid level of the acid liquid collected at the bottom of the acid liquid zone, the side of the gas zone has a negative pressure outlet, the top surface has a hydrogen outlet, and the top of the gas zone is also provided with a hydrogen concentration detection sensor for detecting hydrogen concentration;

[0009] A negative pressure pump, connected to the negative pressure outlet via a negative pressure pumping pipeline, for pumping negative pressure into the separation tower;

[0010] The hydrogen discharge tower is connected to the hydrogen outlet through a hydrogen discharge pipeline, and the hydrogen discharge pipeline is provided with a solenoid valve for controlling the opening and closing of the hydrogen discharge pipeline.

[0011] During production, negative pressure is continuously buffered. A hydrogen concentration detector is installed on the top of the separation tower. When the hydrogen density at the top of the gas zone reaches the set value, the solenoid valve at the top discharge port opens, the hydrogen inside the separation tower is discharged, and the solenoid valve closes. If the hydrogen density inside the separation tower is higher than the set value, the solenoid valve does not open, and the alarm light on the top of the separation tower lights up to remind manual processing. Ensure that the battery vacuum formation process is safe and stable.

[0012] Preferably, an acid liquid discharge outlet is provided at the bottom of the acid liquid zone, so that the liquefied acid liquid can be discharged regularly for recycling.

[0013] Preferably, the top of the gas zone of the separation tower is an arc top or a pointed top with an inner diameter gradually decreasing from bottom to top, and the hydrogen outlet is arranged at the highest point of the gas zone, based on the principle that hydrogen gas has a lighter density.

[0014] A hydrogen alarm is also provided on the outer side of the top surface of the separation tower. When the hydrogen concentration detection sensor detects that the hydrogen concentration exceeds the upper limit, the hydrogen alarm sounds an alarm.

[0015] Preferably, an acid-water separation tank is provided on the negative pressure extraction pipeline, and a negative pressure storage tank is provided between the acid-water separation tank and the negative pressure pump, so as to have a buffering effect on the negative pressure gas.

[0016] The air outlet of the negative pressure pump is connected to an acid mist box, and an acid mist treatment tower is arranged downstream of the acid mist box. The acid mist box and the acid mist treatment tower are connected by a fan and drive the acid mist from the acid mist box into the acid mist treatment tower.

[0017] The system solution of the utility model is designed with production safety in mind, and a separate hydrogen separation and centralized emission system is designed to ensure the stability of safe operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the general diagram of the negative pressure extraction system of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a separation tower;

[0020] Figure 3 This is a schematic diagram of a hydrogen emission tower;

[0021] Figure 4 It is a connection diagram of the acid-water separation tank, the negative pressure storage tank and the negative pressure pump;

[0022] Figure 5 It is a connection diagram of the acid mist box and the acid mist treatment tower;

[0023] Markings in the figure: 1-negative pressure main pipe, 2-separation tower, 21-acid liquid area, 22-gas area, 23-activated carbon layer, 3-negative pressure outlet, 4-hydrogen outlet, 5-hydrogen concentration detection sensor, 6-hydrogen discharge tower, 7-hydrogen discharge pipeline, 8-solenoid valve, 9-acid liquid discharge outlet, 10-hydrogen alarm, 11-negative pressure extraction pipeline, 12-negative pressure pump, 13-acid-water separation tank, 14-negative pressure storage tank, 15-acid mist box, 16-acid mist treatment tower, 17-fan, 18-gas outlet. DETAILED DESCRIPTION

[0024] See also Figures 1 to 5The negative pressure extraction system for negative pressure formation of the utility model includes a negative pressure main pipe 1, and also includes: a separation tower 2, which is divided into an acid liquid area 21 located at the bottom and a gas area 22 located at the top, and the acid liquid area 21 and the gas area 22 are separated by an activated carbon layer 23, and the activated carbon layer 23 is placed on a support surface that can support and place activated carbon, such as a support net. The negative pressure main pipe 1 is connected to the acid liquid area 21 and the connection position is higher than the liquid level of the acid liquid collected at the bottom of the acid liquid area 21. The side of the gas area 22 has a negative pressure outlet 3 and the top surface has a hydrogen outlet 4. The top of the gas area is also provided with a hydrogen concentration detection sensor 5 for detecting the hydrogen concentration; a negative pressure pump 12, connected to the negative pressure outlet 3 through a negative pressure extraction pipeline 11, is used to extract negative pressure in the separation tower 2; a hydrogen discharge tower 6, connected to the hydrogen outlet 4 through a hydrogen discharge pipeline 7, and a solenoid valve 8 for controlling the opening and closing of the hydrogen discharge pipeline 7 is provided on the hydrogen discharge pipeline 7. The system solution designs a separate hydrogen separation and centralized discharge system to ensure the stability of the safe operation of the system.

[0025] An acid liquid discharge outlet 9 is provided at the bottom of the acid liquid zone 21. The liquefied acid liquid can be discharged regularly for recycling.

[0026] The top of the gas zone 22 of the separation tower 2 is an arc top or a pointed top with an inner diameter gradually decreasing from bottom to top, and the hydrogen outlet 4 is arranged at the highest point of the gas zone 22. The arrangement is based on the principle that hydrogen gas has a relatively light density.

[0027] A hydrogen alarm 10 is also provided on the outer side of the top surface of the separation tower 2. When the hydrogen concentration detection sensor 5 detects that the hydrogen concentration exceeds the upper limit, the hydrogen alarm 10 sounds an alarm.

[0028] An acid-water separation tank 13 is provided on the negative pressure extraction pipeline 11 , and a negative pressure storage tank 14 is provided between the acid-water separation tank 13 and the negative pressure pump 12 .

[0029] The air outlet 18 of the negative pressure pump 12 is connected to the acid mist box 15 , and an acid mist treatment tower 16 is arranged downstream of the acid mist box 15 . The acid mist box 15 and the acid mist treatment tower 16 are connected by a fan 17 and drive the acid mist from the acid mist box 15 into the acid mist treatment tower 16 .

[0030] The negative pressure pump 12 is turned on, and the negative pressure is continuously buffered during production. A hydrogen concentration detection sensor 5 is provided at the top of the gas zone 22 in the separation tower 2. When the hydrogen density at the top of the gas zone 22 reaches the set value, the solenoid valve 8 on the hydrogen discharge pipeline 7 is opened, and the hydrogen outlet 4 in the gas zone 22 inside the separation tower 2 is discharged, and the hydrogen discharge tower 6 is discharged through the hydrogen discharge pipeline 7, and the solenoid valve 8 is closed. If the hydrogen density in the gas zone 22 inside the separation tower 2 is higher than the set value, the solenoid valve 8 is not opened, and the top surface hydrogen alarm 10 of the separation tower 2 sounds an alarm to remind manual processing. The acid mist in the gas zone 22 enters the negative pressure extraction pipeline 11 through the negative pressure outlet 3, and then enters the acid water separation tank 13 and the negative pressure storage tank 14, and then enters the acid mist box 15 through the gas outlet 18 of the negative pressure pump 12, and the acid mist is driven from the acid mist box 15 to the acid mist treatment tower 16 for treatment and discharge by the fan 17. It can ensure that the battery vacuum formation process is safe and stable.

Claims

1. A negative pressure extraction system for negative pressure formation, comprising a negative pressure main pipe, characterized in that: Also includes: A separation tower, divided into an acid liquid zone at the bottom and a gas zone at the top, the acid liquid zone and the gas zone are separated by an activated carbon layer, the negative pressure main pipe is connected to the acid liquid zone and the connection position is higher than the liquid level of the acid liquid collected at the bottom of the acid liquid zone, the side of the gas zone has a negative pressure outlet, the top surface has a hydrogen outlet, and the top of the gas zone is also provided with a hydrogen concentration detection sensor for detecting hydrogen concentration; A negative pressure pump, connected to the negative pressure outlet via a negative pressure pumping pipeline, for pumping negative pressure into the separation tower; The hydrogen discharge tower is connected to the hydrogen outlet through a hydrogen discharge pipeline, and the hydrogen discharge pipeline is provided with a solenoid valve for controlling the opening and closing of the hydrogen discharge pipeline.

2. The negative pressure extraction system for negative pressure formation according to claim 1, characterized in that: An acid liquid discharge outlet is arranged at the bottom of the acid liquid zone.

3. The negative pressure extraction system for negative pressure formation according to claim 1, characterized in that: The top of the gas zone of the separation tower is an arc top or a pointed top with an inner diameter gradually decreasing from bottom to top, and the hydrogen outlet is arranged at the highest point of the gas zone.

4. The negative pressure extraction system for negative pressure formation according to claim 3, characterized in that: A hydrogen alarm is also provided on the outer side of the top surface of the separation tower. When the hydrogen concentration detection sensor detects that the hydrogen concentration exceeds the upper limit, the hydrogen alarm sounds an alarm.

5. The negative pressure extraction system for negative pressure formation according to claim 1, characterized in that: The negative pressure extraction pipeline is provided with an acid-water separation tank, and a negative pressure storage tank is provided between the acid-water separation tank and the negative pressure pump.

6. The negative pressure extraction system for negative pressure formation according to claim 1, characterized in that: The air outlet of the negative pressure pump is connected to an acid mist box, and an acid mist treatment tower is arranged downstream of the acid mist box. The acid mist box and the acid mist treatment tower are connected by a fan and drive the acid mist from the acid mist box into the acid mist treatment tower.

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