CN211635234U

CN211635234U - Concentrated mist separator of wet process phosphoric acid of dihydrate

Info

Publication number: CN211635234U
Application number: CN201921499044.8U
Authority: CN
Inventors: 周孝义; 彭璟
Original assignee: Wengfu Zijin Chemical Industry Co Ltd
Current assignee: Wengfu Zijin Chemical Industry Co Ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-10-09
Anticipated expiration: 2029-09-10

Abstract

The utility model discloses a concentrated mist foam separator of dihydrate wet process phosphoric acid reforms transform on original basis, and mist foam separator (4) lower liquid pipe mounted position reforms transform the scheme: the pipeline communicated with the liquid descending pipe of the evaporation chamber (2) and the conical bottom of the mist separator (4) is redirected and connected to the inlet pipeline of the material conveying pump (5), and the installation height of the connection of the two pipelines must ensure that the conical bottom of the mist separator (4) is not immersed by the phosphoric acid solution; the mist separator (4) is characterized in that the inner part of the conical bottom is reformed: a grid plate (6) is additionally arranged in the conical bottom of the mist-foam separator (4) and used for intercepting and crushing gypsum dirt blocks falling on the wall surface of the mist-foam separator (4) and preventing the dirt blocks from falling to block the conical bottom of the mist-foam separator (4). The utility model discloses realize the long operation cycle interior fog foam separator of concentrated system awl end and the unblocked purpose of downcomer.

Description

Concentrated mist separator of wet process phosphoric acid of dihydrate

Technical Field

The utility model relates to a dihydrate wet process phosphoric acid production field, the specially adapted solves the concentrated mist foam separator of phosphoric acid and blocks up the problem.

Background

In the traditional phosphoric acid concentration device by the dihydrate wet method, a liquid discharge pipeline of the mist separator is connected with a liquid discharge pipeline of an evaporation chamber into a whole. In the operation process of the concentration system, the cone bottom of the entrainment separator is always immersed by phosphoric acid solution, the phosphoric acid solution at the position is difficult to flow, and in the evaporation process of dilute phosphoric acid, a large amount of solid crystals are generated due to the increase of concentration, and are mainly fluoride and phosphogypsum, and the solid crystals are enriched at the joint of the cone bottom of the entrainment separator and the lower liquid pipe to form compact scale blocks to block the lower liquid pipe of the entrainment separator. And the operation time of the concentration system is long, and a large amount of gypsum scale layers are formed on the wall surface of the mist-foam separator, so that the gypsum scale layers are easy to collapse and block the conical bottom of the separator.

The phosphoric acid solution separated by the separator cannot return to the evaporation chamber and is gradually filled into the vacuum channel due to the blockage of the liquid discharge pipe and the conical bottom of the entrainment separator, and the phosphoric acid solution enters a fluosilicic acid production system under the high-speed drive of the evaporated gas, so that the phosphorus content of fluosilicic acid is greatly increased, the quality of the produced fluosilicic acid is unqualified, and the entrainment separator and a concentration floor can generate severe vibration, so that a greater safety risk exists. Therefore, the concentration system can only be stopped for cleaning, the time and the labor are consumed, the operation environment is severe, a large amount of phosphorus-containing solids and phosphoric acid solution which are cleaned are difficult to recover, great waste is caused, and the field management difficulty is high.

Through patent retrieval, the problem that the phosphoric acid at the conical bottom of the separator is difficult to flow and continuously crystallize and form scale and the problem that the conical bottom of the separator is scaled and blocked by the scale collapse of the separator are not solved in the conventional two-water wet process phosphoric acid concentrated mist separator which is not found to be blocked by adopting integral heat preservation or properly increasing the diameter of the liquid discharging pipe of the separator for the separator.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to the defect that above-mentioned exists, provide a phosphoric acid mist separator of dihydrate wet process after reforming transform.

The technical scheme of the utility model is that: a two-water wet method phosphoric acid concentration mist separator is reformed based on the original, comprising the reforming of the installation position of a lower liquid pipe of the mist separator and the reforming of the inner part of a conical bottom of the mist separator;

the improvement scheme of the installation position of the lower liquid pipe of the mist separator is as follows: the pipeline for communicating the cone bottom of the mist separator with the lower liquid pipe of the evaporation chamber is changed to be connected to the inlet pipeline of the feed delivery pump, and the installation height for connecting the two pipelines must ensure that the cone bottom of the mist separator is not immersed by the phosphoric acid solution.

The mist separator cone bottom interior modification scheme is as follows: a grid plate is additionally arranged in the cone bottom of the mist separator and used for intercepting and breaking gypsum scale blocks falling from the wall surface of the mist separator, and the scale blocks are prevented from falling to block the cone bottom of the mist separator.

The inventor points out that: the installation height of the pipeline connecting the cone bottom of the mist separator and the inlet pipeline of the feed pump is determined according to the local atmospheric pressure and the vacuum degree controlled by the concentration system.

The utility model has the advantages that: (1) through downcomer mounted position transformation, guaranteed that the liquid that gets into in the entrainment separator under vacuum state is in the fast flow state always, effectively prevent phosphoric acid solution deposit scale deposit in entrainment separator awl bottom department. (2) The purpose that the cone bottom and the lower liquid pipe of the mist and foam separator are not blocked in a long operation period of the concentration system is achieved. (3) Solves the problems of unqualified quality of the produced fluosilicic acid, vibration of concentrated floors, uncontrollable shutdown of a system, high difficulty in field management during cleaning and the like caused by blockage of a separator. (4) When the concentration system is normally stopped, the mist separator can also fully utilize the chemical cleaning period of the concentration system to realize effective cleaning.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The equipment represented by each labeled sequence number in the figure is as follows: 1-a heat exchanger; 2-an evaporation chamber; 3-a circulating pump; 4-mist separator; 5, a material conveying pump; 6-grid plate.

Detailed Description

The phosphoric acid production device for Vanfu purple gold chemical industry limited company is reformed: the pipeline communicated with the lower liquid pipe of the evaporation chamber 2 is changed to be connected with the inlet pipeline of the material conveying pump 5 at the position of 6.5 meters in height, and the phosphoric acid solution separated by the mist separator 4 enters the inlet of the material conveying pump 5 and is conveyed to the concentrated phosphoric acid storage tank through the material conveying pump 5. Therefore, the phosphoric acid in the liquid outlet pipe of the entrainment separator 4 is in a fast flowing state all the time, and the problem that the conical bottom and the liquid outlet pipe of the entrainment separator 4 are blocked by phosphoric acid deposition and crystallization is solved. Meanwhile, considering that the concentration system runs for a long time, gypsum scale blocks on the wall surface of the mist separator 4 fall to block the conical bottom, and the grid plate 6 is additionally arranged at the conical bottom of the mist separator 4, so that the length, the width and the thickness of the aperture are 80mm x 6mm, and the material is 904L and is used for intercepting the scale blocks. Through the transformation, the conventional cleaning of the concentration system is matched, the blockage of the conical bottom and the liquid descending pipe of the mist separator 4 is completely prevented, and the concentration of the product phosphoric acid is not influenced. The utility model discloses the application that has succeeded.

Claims

1. A concentrated mist separator of wet process phosphoric acid of dihydrate, its characteristic is: firstly, a liquid descending pipe of an evaporation chamber (2) is connected with an inlet pipeline of a material conveying pump (5), a liquid descending pipe of an entrainment separator (4) is also connected with a pipeline for connecting the liquid descending pipe of the evaporation chamber (2) with the material conveying pump (5), and the liquid descending pipe of the entrainment separator (4) is connected at a height which must ensure that the cone bottom of the entrainment separator (4) is not immersed by phosphoric acid solution;

secondly, a grid plate (6) is additionally arranged in the cone bottom of the mist separator (4).