CN-121974302-A - Process for producing sulfuric acid of storage battery

Abstract

A process for producing storage battery sulfuric acid belongs to the field of storage battery sulfuric acid and comprises the following steps of extracting gas at a three-stage conversion outlet of a sulfuric acid device converter and primary conversion flue gas at a three-stage conversion outlet, mixing and heating, sending the mixed flue gas to a sulfur trioxide evaporator, sending the mixed flue gas to a nicotinic acid absorption tower after heat exchange, sending sulfur trioxide gas generated after heat exchange in the sulfur trioxide evaporator to a storage battery sulfuric acid absorption tower, spraying and absorbing by sulfuric acid, overflowing the storage battery sulfuric acid from the storage battery sulfuric acid absorption tower to a two-stage degassing tower in an overflow mode, blowing out sulfur dioxide gas dissolved in the storage battery sulfuric acid by the two-stage degassing tower through clean air, and pumping the storage battery sulfuric acid after the two-stage degassing tower is degassed into a storage battery sulfuric acid storage tank through an acid production pump. The invention can accurately control the purity and impurity content of the storage battery sulfuric acid, and ensure that the product quality meets the standard requirement of the storage battery sulfuric acid.

Inventors

• LI JINGLI
• HU XUANXUAN
• ZHANG KAILI
• QIAN MING
• SUN ZHONGMING
• LIU ZONGSHU
• FENG XIPENG

Assignees

• 河北冀衡集团有限公司
• 河北冀衡集团有限公司蓝天分公司

Dates

Publication Date

20260505

Application Date

20260107

Claims (8)

1. 1. A process for producing storage battery sulfuric acid is characterized by comprising the following steps: extracting gas at a three-stage conversion outlet of a sulfuric acid device converter and primary conversion flue gas at a three-stage conversion outlet, mixing and heating, and then sending the mixed gas into a heat exchange pipeline of a sulfur trioxide evaporator to exchange heat with fuming sulfuric acid with concentration of more than 30 percent; step two, the mixed flue gas after heat exchange is sent into a nicotinic acid absorption tower, and sulfur trioxide in the mixed flue gas is circularly absorbed by fuming sulfuric acid with the concentration of 30 percent; step three, delivering sulfur trioxide gas generated after heat exchange in the sulfur trioxide evaporator into a storage battery sulfuric acid absorption tower, and spraying and absorbing by sulfuric acid; And step four, overflow of the storage battery sulfuric acid from the storage battery sulfuric acid absorption tower into a two-stage degassing tower in an overflow mode, wherein the two-stage degassing tower blows out sulfur dioxide gas dissolved in the storage battery sulfuric acid through clean air, and the storage battery sulfuric acid degassed by the two-stage degassing tower is pumped into a storage battery sulfuric acid storage tank through an acid production pump.
2. 2. The process for producing sulfuric acid for a storage battery according to claim 1, wherein the temperature of the mixed gas of the third-stage conversion outlet gas of the sulfuric acid plant converter and the primary conversion flue gas of the third-stage conversion outlet in the first step is 300 ℃.
3. 3. The process for producing the storage battery sulfuric acid according to claim 1, wherein a fuming sulfuric acid cooler is arranged on a fuming sulfuric acid circulating absorption pipeline with the concentration of 30% of the nicotinic acid absorption tower in the second step.
4. 4. The process for producing the storage battery sulfuric acid according to claim 1, wherein in the second step, the outlet of the nicotinic acid circulating pump sends 30% of fuming sulfuric acid to the nicotinic acid preheater to preheat the fuming sulfuric acid from the sulfur trioxide evaporator and then the fuming sulfuric acid enters the sulfur trioxide evaporator.
5. 5. The process for producing the storage battery sulfuric acid according to claim 1, wherein fuming sulfuric acid from the sulfur trioxide evaporator in the second step is sent to a nicotinic acid preheater to exchange heat with fuming sulfuric acid to be sent to the sulfur trioxide evaporator and then is sent to a nicotinic acid absorption tower.
6. 6. The process for producing the storage battery sulfuric acid according to claim 1, wherein an absorption circulating pump outlet of the storage battery sulfuric acid absorption tower in the step three is provided with an absorption acid cooler, and the temperature of absorption acid entering the storage battery sulfuric acid absorption tower is controlled below 60 ℃.
7. 7. The process for producing the storage battery sulfuric acid according to claim 1, wherein in the third step, the acid concentration in the storage battery sulfuric acid absorption tower is obtained through an acid concentration meter, the rotation speed of a feed pump is controlled through adjusting a feed pump frequency converter so as to adjust the addition amount of desalted water in the storage battery sulfuric acid absorption tower, and the acid concentration in the storage battery sulfuric acid absorption tower is maintained at 96%.
8. 8. The process for producing the storage battery sulfuric acid according to claim 1, wherein sulfur dioxide gas blown out from the two-stage degassing tower in the fourth step is sent to a sulfuric acid device to be recycled.

Description

Process for producing sulfuric acid of storage battery Technical Field The invention belongs to the field of storage battery sulfuric acid, and particularly relates to a process for producing storage battery sulfuric acid. Background The conventional storage battery sulfuric acid production is mainly carried out by a preparation process of sulfur-based acid, but the preparation process of sulfur-based acid is complex, the energy consumption in the production process is relatively high, the generated tail gas treatment difficulty is relatively high, the current requirements on the environment-friendly production process are difficult to meet, in addition, the pyrite-based acid contains more impurities and noble metal ions, and has a larger gap from the standard required by the storage battery sulfuric acid, the produced storage battery sulfuric acid is difficult to accurately control in key indexes such as purity, impurity content and the like, and the performance and the service life of the storage battery are influenced, so that the conventional storage battery sulfuric acid production process is required to be simple in process, low in cost, high in energy utilization rate and capable of guaranteeing the product quality. Disclosure of Invention The invention provides a process for producing storage battery sulfuric acid, which is used for solving the defects in the prior art. The invention is realized by the following technical scheme: A process for producing sulfuric acid for a storage battery, comprising the steps of: extracting gas at a three-stage conversion outlet of a sulfuric acid device converter and primary conversion flue gas at a three-stage conversion outlet, mixing and heating, and then sending the mixed gas into a heat exchange pipeline of a sulfur trioxide evaporator to exchange heat with fuming sulfuric acid with concentration of more than 30 percent; step two, the mixed flue gas after heat exchange is sent into a nicotinic acid absorption tower, and sulfur trioxide in the mixed flue gas is circularly absorbed by fuming sulfuric acid with the concentration of 30 percent; step three, delivering sulfur trioxide gas generated after heat exchange in the sulfur trioxide evaporator into a storage battery sulfuric acid absorption tower, and spraying and absorbing by sulfuric acid; And step four, overflow of the storage battery sulfuric acid from the storage battery sulfuric acid absorption tower into a two-stage degassing tower in an overflow mode, wherein the two-stage degassing tower blows out sulfur dioxide gas dissolved in the storage battery sulfuric acid through clean air, and the storage battery sulfuric acid degassed by the two-stage degassing tower is pumped into a storage battery sulfuric acid storage tank through an acid production pump. In the process for producing the storage battery sulfuric acid, the temperature after the gas at the three-stage conversion outlet of the sulfuric acid device converter and the primary conversion flue gas at the three-stage conversion outlet are mixed in the step one is 300 ℃. In the process for producing the storage battery sulfuric acid, a fuming sulfuric acid cooler is arranged on a fuming sulfuric acid circulating absorption pipeline with the concentration of 30% of the nicotinic acid absorption tower in the second step. In the second step, the outlet of the nicotinic acid circulating pump sends 30% fuming sulfuric acid to the nicotinic acid preheater to preheat the fuming sulfuric acid from the sulfur trioxide evaporator and then enter the sulfur trioxide evaporator. The fuming sulfuric acid from the sulfur trioxide evaporator in the second step is sent to the nicotinic acid preheater to exchange heat with the fuming sulfuric acid to be sent to the sulfur trioxide evaporator and then is sent to the nicotinic acid absorption tower. In the process for producing the storage battery sulfuric acid, an absorption circulating pump outlet of the storage battery sulfuric acid absorption tower is provided with an absorption acid cooler, and the temperature of absorption acid entering the storage battery sulfuric acid absorption tower is controlled below 60 ℃. According to the process for producing the storage battery sulfuric acid, in the third step, the acid concentration in the storage battery sulfuric acid absorption tower is obtained through the acid concentration table, the rotating speed of the water feeding pump is controlled through adjusting the frequency converter of the water feeding pump, so that the adding amount of the desalted water in the storage battery sulfuric acid absorption tower is adjusted, and the acid concentration in the storage battery sulfuric acid absorption tower is maintained at 96%. The sulfur dioxide gas blown out by the two-stage degassing tower in the fourth step is sent to a sulfuric acid device to be recycled. The invention has the advantages that the high-temperature flue gas at the outlets of the existing converter and