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Online cleaning method for off-gas pipe in fluosilicic acid concentration system

A concentration system and tail gas pipe technology, applied in the direction of fluosilicic acid, cleaning methods and appliances, chemical instruments and methods, etc., can solve the problems of gas phase pipe blockage, affecting the continuous and stable operation of the device, labor and time, etc., so as to avoid the impact and save The cost of maintenance and cleaning, and the effect of avoiding dead ends of pipelines

Active Publication Date: 2015-05-20
贵州瓮福蓝天氟化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the fluosilicic acid concentration system, the unabsorbed SiF 4 Overflowing from the gas phase outlet, because there is some water vapor in the middle, it is easy to generate fluorosilicic acid and silicon dioxide, and the silicon dioxide containing fluorosilicic acid often crystallizes and adheres to the tube wall, causing gas phase tube blockage
[0004] The existing technology usually requires manual cleaning to solve the problem, which not only requires disassembly and assembly of the pipeline, but also requires labor and time, which seriously affects the continuous and stable operation of the device

Method used

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  • Online cleaning method for off-gas pipe in fluosilicic acid concentration system

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Experimental program
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Effect test

Embodiment 1

[0016] An online cleaning method for tail gas pipes of a fluosilicic acid concentration system, comprising the following steps:

[0017] (1) Acid dispensing: first introduce dilute fluosilicic acid with a mass concentration of 25% of the raw material, which accounts for 70% of the liquid level of the acid dispensing tank 1 (volume 7m??), as the acid dispensing mother liquor; determine the pre-prepared hydrofluoric acid When the mass concentration is 12%, start the circulation pump 2 to pass the dilute fluorosilicate mother liquor through the cooler 3 and then enter the Venturi 4 for full reflux operation. After stabilization, the HF flow control valve 5 can be opened to introduce crude acid HF, and the flow rate is controlled at 1m 3 / h, the temperature of acid mixing tank 1 does not exceed 40°C, stop the entry of crude acid HF after the liquid level of acid mixing tank 1 reaches 80%, and the acid mixing is completed;

[0018] (2) Cleaning: When the tail gas pipe of the...

Embodiment 2

[0020] An online cleaning method for tail gas pipes of a fluosilicic acid concentration system, comprising the following steps:

[0021] (1) Acid dispensing: first introduce dilute fluosilicic acid with a mass concentration of 20% of the raw material, which accounts for 70% of the liquid level of the acid dispensing tank 1 (volume 7m??), as the acid dispensing mother liquor; determine the pre-prepared hydrofluoric acid The mass concentration is 17%, and the circulating pump 2 is started to pass the dilute fluorosilicate mother liquor through the cooler 3 and then enters the Venturi 4 to spray for full reflux operation. After stabilization, the HF flow control valve 5 can be opened to introduce crude acid HF, and the flow rate is controlled at 1.5m 3 / h, the temperature of acid distribution tank 1 is not higher than 40°C, and the liquid level of acid distribution tank 1 reaches 85% to stop the crude acid HF from entering, and the acid distribution is completed;

[0022] ...

Embodiment 3

[0024] An online cleaning method for tail gas pipes of a fluosilicic acid concentration system, comprising the following steps:

[0025] (1) Acid dispensing: first introduce dilute fluosilicic acid with a mass concentration of 15% of the raw material, accounting for 70% of the liquid level of the acid dispensing tank 1 (volume 7m??), as the acid dispensing mother liquor; determine the pre-prepared hydrofluoric acid The mass concentration is 22%, and the circulation pump 2 is started to pass the dilute fluorosilicate mother liquor through the cooler 3 and then enters the Venturi 4 to spray for full reflux operation. After stabilization, the HF flow control valve 5 can be opened to introduce crude acid HF, and the flow rate is controlled at 2m 3 / h, the temperature of acid mixing tank 1 is not higher than 40°C, and the liquid level of acid mixing tank 1 reaches 90% to stop the crude acid HF from entering, that is, the acid mixing is completed;

[0026] (2) Cleaning: When...

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Abstract

The invention discloses an online cleaning method for an off-gas pipe in a fluosilicic acid concentration system. The online cleaning method comprises the steps that firstly, diluted fluosilicic acid is led into an acid blending tank (1) and serves as an acid blending mother solution; afterwards, a circulating pump (2) is started to enable the diluted fluosilicic acid mother solution to pass through a cooler (3) and then to enter a Venturi (4) for spraying, so that total reflux operation is performed; after stabilization, an HF flow control valve (5) can be opened to lead in crude acid HF, flow is controlled to be 1-2 m<3> / h, and the acid blending temperature is not higher than 40 DEG C; leading in of the crude acid HF is stopped after the blended solution reaches 80%-90% the liquid level of the acid blending tank (1), and then acid blending is completed; when the off-gas pipe in the concentration system needs to be cleaned, a valve (9) between an outlet of the circulating pump (2) and the off-gas pipe is opened, a reflux valve (10) is closed, fluorhydric acid is fed into a gas-phase pipe (7) through an off-gas pipe nozzle (8), makes full contact with silicon dioxide and then flows into a concentration system (6) along a pipeline, and the cleaning effect can be completely achieved after spraying of 5 min-10 min. The online cleaning method guarantees continuous and stable operation of a device and fully utilizes raw material acid resources.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to an online cleaning method for an exhaust pipe of a fluosilicic acid concentration system. Background technique [0002] In anhydrous hydrogen fluoride (AHF) production system, HF and SiF are produced by decomposing concentrated fluorosilicic acid with sulfuric acid 4 , HF is absorbed and separated with sulfuric acid to obtain crude acid HF containing certain impurities, and then through a rectification system to obtain relatively pure AHF. while SiF 4 After preliminary washing with sulfuric acid, it enters the concentration system to concentrate the raw material dilute fluorosilicic acid, and the resulting silica and concentrated fluorosilicic acid are separated by filtration to obtain relatively pure reaction raw materials. [0003] In the fluosilicic acid concentration system, the unabsorbed SiF 4 When it overflows from the gas phase outlet, because s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/093C01B33/10
CPCB08B9/032C01B33/103
Inventor 李建国杨国荣汤仁恒
Owner 贵州瓮福蓝天氟化工股份有限公司
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