Sulfuric acid dilution system, control method and application

Abstract

The invention belongs to the technical field of sulfuric acid dilution, and discloses a sulfuric acid dilution system, a control method and application, a concentrated sulfuric acid storage tank is connected with a feeding pump through a pipeline, the feeding pump is connected with a concentrated sulfuric acid high-level tank through a pipeline, and the concentrated sulfuric acid high-level tank is connected with a graphite sulfuric acid dilution cooler through a pipeline; the graphite sulfuric acid dilution cooler is connected with a dilute sulfuric acid storage tank through a pipeline; the lower end of the dilute sulfuric acid storage tank is connected with a circulating pump through a pipeline; the circulating pump is connected with the dilute sulphuric acid cooler through a pipeline; the dilute sulphuric acid cooler is connected with the upper end of the dilute sulphuric acid storage tank through a pipeline; and the upper end of the graphite sulfuric acid dilution cooler is connected with a process water high-level tank through a pipeline; and a softened water inlet is formed in the process water high-level tank. The problems of corrosion and high-temperature scouring caused by direct contact of concentrated sulfuric acid with the inner wall of the graphite connecting pipe are avoided; and meanwhile, concentrated sulfuric acid is bubbled and sprayed out in the mixing chamber through an F4 hose and is mixed with atomized spray water to release dissolution heat. Dilute sulphuric acid is rapidly and uniformly mixed.

Description

technical field [0001] The invention belongs to the technical field of sulfuric acid dilution, and in particular relates to a sulfuric acid dilution system, control method and application. Background technique [0002] At present, sulfuric acid dilution is generally divided into two types: batch method and continuous method. There are basically two types of sulfuric acid dilution devices at present. One is the simple structure three-way pipe mixing dilution technology, and then put the dilute acid into a large storage tank, and the dilute acid is cooled naturally. Due to the reason of dilution heat, this process has basically Elimination; the other is to use special equipment for graphite sulfuric acid dilution cooler to cool the dilute sulfuric acid to room temperature. After the concentrated sulfuric acid and water are mixed in the upper mixing chamber of the equipment, they enter the lower cooling section for cooling. The traditional method is to pump the concentrated su...

AI Technical Summary

Problems solved by technology

The traditional method is to pump the concentrated sulfuric acid and water to the high level tank, and then pass the concentrated sulfuric acid and dilution water through the flow regulating valve and the one-way valve according to the ratio and enter the upper part of the graphite sulfuric acid dilution cooler from the concentrated acid inlet pipe and the dilution water inlet pipe respectively. There are two problems in this process: 1) local high temperature, because the concentrated sulfuric acid will release a lot of heat when it meets water, which will cause corrosion and erosion of the pipeline inlet and the contact parts with a large amount of concentrated acid; 2) mixing Inhomogeneous, because the two streams of fluids converge toward the middle in the mixing chamber and rely on natural mixing. After flowing down through the overflow hole on the side, they need to be further mixed and diluted in the longitudinal channel of the lower heat exchange section to release heat.

Although the steel-lined PTFE type II acid mixer can be used (its structure is as attached Figure 4 ) to improve the strength of the mixing chamber, but there is still the problem that the heat transfer effect of the lower heat transfer section is poor. Between 465w / ㎡·k, because the acid liquid in the material hole of the equipment cannot be covered on the material hole wall or there is local liquid film thickness unevenness, the total heat transfer coefficient will be lower

(2) The shell-side circulating cooling water has gaps in the shell-side baffles, which can easily cause overflow and affect the cooling water channel through which the cooling water passes vertically through the heat exchange block, reducing the total heat transfer coefficient and heat transfer efficiency of the shell side of the equipment

[0008] (1) Local high temperature, because concentrated sulfuric acid will release a lot of heat when it meets water, which will cause corrosion and erosion at the inlet of the pipeline and the contact parts with a large amount of concentrated acid

[0009] (2) The mixing is not uniform, because the two fluids converge in the mixing chamber to the middle and rely on natural mixing. After flowing down through the overflow hole on the side, they need to be further mixed and diluted in the longitudinal channel of the lower heat exchange section to release heat.

[0012] (2) The pressure of concentrated sulfuric acid and water entering the upper mixing chamber is low, which affects the production capacity of dilute sulfuric acid

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