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Phosphoric acid production system

A production system, phosphoric acid technology, applied in the direction of phosphoric acid, phosphorus oxyacid, etc., can solve the problems of easy error in human control, large amount of process parameter control, unstable product quality, etc., to improve detection accuracy and control accuracy, and realize Effect of automatic control and reduction of accident rate

Inactive Publication Date: 2006-07-19
YIBIN TIANYUAN GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a new type of thermal phosphoric acid production system using computer distributed control technology in view of the shortcomings of the existing thermal phosphoric acid production line, which have a large amount of process parameter control, human control is prone to error, and product quality is unstable.

Method used

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  • Phosphoric acid production system
  • Phosphoric acid production system
  • Phosphoric acid production system

Examples

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Effect test

Embodiment 1

[0013] In this example, a digital control system is selected, and the main control device consists of AD converter, DA converter, controller and operation station. System structure see figure 2 . The input end of the AD converter is connected with the detection device, and the detected process parameters are digitized and then input into the controller. The controller compares the input data with the set value, and after internal program operation processing, outputs the digital control signal to the DA converter. Process parameters are adjusted. At the same time, the image interface of each relevant detection and adjustment process is displayed in real time at the operation station through the bus, and the operator can also control the system at the operation station.

[0014] The digital control system has the advantages of parameter detection, high control precision and strong anti-interference ability.

Embodiment 2

[0016] The structure diagram of the DCS system in this example is as follows: image 3 , the figure shows the process parameter detection points and control points of the main process of the thermal phosphoric acid production line. The following is a detailed description of the DCS system in this example according to the process flow of the production line:

[0017] 1. Liquid level control of the hydration tower: The hydration tower is the main equipment for the production of thermal phosphoric acid. After the yellow phosphorus is burned in the hydration tower, it reacts with water to form dilute phosphoric acid, which is then refluxed through the circulating acid pump, so that the dilute acid returns to the hydration tower to form a film, and the water in the dilute acid is continuously mixed with P 2 o 5 The reaction generates phosphoric acid, so that the concentration of the acid is continuously increased. When the concentration reaches 82% (the existing pentasodium produ...

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Abstract

The invention relates to a computer DCS in phosphoric acid manufacture technique, which comprises a thermal phosphoric acid process line and a connected DCS system. This invention overcomes the problems of large parameter control quantity, manual error and unstable production quality in prior art, realizes automatic control for key process, and fit to reconstruction for current process line.

Description

technical field [0001] The invention relates to an automatic control technology, in particular to a computerized distributed control system (DCS) system for a phosphoric acid production process. Background technique [0002] Phosphoric acid (H 3 PO 4 ) is an important chemical raw material. According to the preparation process, it can be divided into wet process phosphoric acid and thermal process phosphoric acid. Thermal phosphoric acid products have the characteristics of high phosphoric acid concentration, high purity, low impurity content, no sulfur, and high yield. The production process of thermal phosphoric acid is: the molten yellow phosphorus enters the phosphorus nozzle of the hydration tower after being replaced by phosphorus water, atomized by steam, and combusted with the secondary air sent by the tail gas fan to generate phosphorus pentoxide (P 2 o 5 ). Phosphorus pentoxide gas is absorbed by circulating acid water to produce phosphoric acid. The reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18
Inventor 邓敏何元坤肖明谢彬李江林陈昌莉
Owner YIBIN TIANYUAN GRP CO LTD
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