Gas-solid two-phase flow detection system of electrolytic aluminum defluorination purification system

Abstract

The utility model discloses a gas-solid two-phase flow detection system of an electrolytic aluminum defluorination purification system, which comprises a defluorination purification treatment adsorption reactor and an electrolytic aluminum flue gas fluorine purification gas-solid separator which are connected with each other, and a first data acquisition device is mounted at an inlet of the defluorination purification treatment adsorption reactor; the first data acquisition device comprises a particulate matter concentration sensor, a temperature sensor, a flow velocity sensor, a hydrogen fluoride concentration sensor, a sulfur dioxide concentration sensor and a pressure sensor; the particulate matter concentration sensor, the temperature sensor, the flow velocity sensor, the hydrogen fluoride concentration sensor, the sulfur dioxide concentration sensor and the pressure sensor are externally connected with a first data acquisition unit, and the first data acquisition unit is electrically connected with an external power supply. The problem that a traditional electrolytic aluminum defluorination purification system cannot effectively detect the state of gas-solid flow is solved, and a guarantee is provided for stable operation of the electrolytic aluminum defluorination purification system.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic aluminium discharges pollutant's processing detection technical field, belong to a kind of gas-solid two-phase flow detection system of electrolytic aluminium defluorination purification system specifically. BACKGROUND

[0002] Modern aluminum industry production, generally adopts cryolite-alumina molten salt electrolysis method. Its main equipment is electrolytic cell. The flux for electrolytic aluminium includes cryolite (i.e. sodium aluminum fluoride Na3AlF6), sodium fluoride (NaF), aluminum fluoride (AlF3), calcium fluoride (CaF2), magnesium fluoride (MgF2) and the like. Electrolytic aluminium process production adopts traditional cryolite-alumina molten electrolysis method, cryolite, aluminum fluoride and other additives and the like are added into electrolytic cell according to the required ratio, a certain amount of alumina raw material is dissolved in molten cryolite, direct current is introduced through carbon anode, electrochemical reaction occurs, and liquid aluminum is deposited on cathode. O2 deposited in electrolytic production process reacts with anode carbon to generate CO and CO2, these gases, hydrogen fluoride produced by hydrolysis of fluorinated salt, carbon tetrafluoride, fluorinated salt volatilization, and corresponding solid dust particles and fluorine-containing flue gas, and sulfur in petroleum coke enter carbon anode, and are electrochemically oxidized to SO2 in electrolytic process, are collected by the airtight cover of electrolytic cell, and are sent to dry purification system and desulfurization system using Al2O3 as adsorbent after purification treatment, and are discharged into atmosphere.

[0003] In recent years, almost all enterprises using prebaked anode aluminum electrolytic cell in China adopt dry purification of alumina adsorbing hydrogen fluoride (i.e. electrolytic aluminium defluorination purification) and semi-dry desulfurization purification technology. At present, there is no adsorbent adsorbing HF dry purification process data detection device for particle concentration / temperature / flow rate / HF / SO2 / pressure process data in the dry purification system of alumina adsorbing hydrogen fluoride of enterprise, and relevant self-adaptive numerical tube technology, only the differential pressure of bag-type dust collector and the particle, HF, SO2 and the like online monitoring device of system discharge outlet are set according to the requirements of national pollutant discharge standard. The relevant process running data is lacked in the whole defluorination purification process, and is controlled by experience. The overall efficiency of the equipment cannot be well played, and the adjustment of technical index is largely dependent on experience operation and management; the technical level and experience of operation and management personnel seriously affect the running effect of electrolytic aluminium purification system, for example, leading to low system balance and stability, low and large deviation of fluorine concentration of solid product-fluorine-loaded alumina after running, serious "fouling" phenomenon in equipment running, and abnormal and uneven flow of "material flow", even hindering the flow; the balance of gas-solid two-phase flow field of the system is difficult to maintain, and the overall running process energy consumption is large and unstable. Therefore, the purification efficiency of the system, gas flow and system balance are significantly reduced. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of gas-solid two-phase flow detection systems of electrolytic aluminium defluorination purification system, overcome the deficiency of prior art.

[0005] To solve the above problems, the technical solutions adopted by the utility model are as follows:

[0006] The gas-solid two-phase flow detection system of electrolytic aluminium defluorination purification system includes mutually connected defluorination purification treatment adsorption reactor and electrolytic aluminium flue gas fluorine purification gas-solid separator, first data acquisition device is installed at the inlet of the defluorination purification treatment adsorption reactor, the first data acquisition device includes particulate concentration sensor, temperature sensor, flow rate sensor, hydrogen fluoride concentration sensor, sulfur dioxide concentration sensor and pressure sensor, the particulate concentration sensor, temperature sensor, flow rate sensor, hydrogen fluoride concentration sensor, sulfur dioxide concentration sensor and pressure sensor are connected with first data acquisition unit, and the first data acquisition unit is electrically connected with external power supply.

[0007] Further, second data acquisition device is installed at the outlet of the electrolytic aluminium flue gas fluorine purification gas-solid separator, the second data acquisition device includes particulate concentration sensor, temperature sensor, flow rate sensor, hydrogen fluoride concentration sensor, sulfur dioxide concentration sensor and pressure sensor, the particulate concentration sensor, temperature sensor, flow rate sensor, hydrogen fluoride concentration sensor, sulfur dioxide concentration sensor and pressure sensor are connected with second data acquisition unit, and the second data acquisition unit is electrically connected with external power supply.

[0008] Compared with the prior art, the utility model has the following implementation effects:

[0009] The gas-solid two-phase flow detection system of electrolytic aluminium defluorination purification system can detect the particulate concentration, temperature, flow rate, hydrogen fluoride concentration, sulfur dioxide concentration and pressure data of flue gas before and after the defluorination purification treatment adsorption reactor and electrolytic aluminium flue gas fluorine purification gas-solid separator, solve the problem that traditional electrolytic aluminium defluorination purification system cannot effectively detect the state of gas-solid flow, and provide guarantee for stable operation of electrolytic aluminium defluorination purification system. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The utility model is practical structure schematic diagram.

[0011] Reference signs: 1, defluorination purification treatment adsorption reactor; 2, first data acquisition device; 3, first data acquisition unit; 4, electrolytic aluminium flue gas fluorine purification gas-solid separator; 5, second data acquisition device; 6, second data acquisition unit. DETAILED DESCRIPTION

[0012] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0013] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0014] As shown in the accompanying Figure 1 The gas-solid two-phase flow detection system of the electrolytic aluminum defluorination purification system is applied at the defluorination purification treatment adsorption reactor 1 and the electrolytic aluminum flue gas fluorine purification gas-solid separator 4 of the electrolytic aluminum defluorination purification system. The flue gas containing fluorine discharged from the electrolytic aluminum workshop enters the defluorination purification treatment adsorption reactor 1 for defluorination treatment. The flue gas after defluorination treatment enters the electrolytic aluminum flue gas fluorine purification gas-solid separator for gas-solid separation. The flue gas after gas-solid separation is sent to the desulfurization system for desulfurization. The gas-solid two-phase flow detection system of the present technical solution comprises a first data acquisition device 2 installed at the fluorine-containing flue gas inlet of the defluorination purification treatment adsorption reactor 1. The first data acquisition device 2 comprises a particulate matter concentration sensor, a temperature sensor, a flow rate sensor, a hydrogen fluoride concentration sensor, a sulfur dioxide concentration sensor and a pressure sensor. The particulate matter concentration sensor, the temperature sensor, the flow rate sensor, the hydrogen fluoride concentration sensor, the sulfur dioxide concentration sensor and the pressure sensor are externally connected to a first data acquisition unit 3. The first data acquisition unit 3 is electrically connected to an external power supply. The first data acquisition device 2 can detect and collect the particulate matter concentration, temperature, flow rate, hydrogen fluoride concentration, sulfur dioxide concentration and pressure data of the flue gas entering the defluorination purification treatment adsorption reactor 1 in real time, and send the data to an upper computer (enterprise data management platform) after processing by the first data acquisition unit 3, so as to realize real-time control of the flue gas at the inlet of the defluorination purification treatment adsorption reactor 1. The flow field at the inlet of the defluorination purification treatment adsorption reactor 1 requires that the flow rate is not less than 4 m / s, the temperature is not higher than 150 DEG C, the flow field pressure is not less than -5000 Pa, and the flow field mainly comprises 0.01-10 g / m 3 Dust particulate matter (mainly aluminum oxide, fluoride salt and other dust particulate matter), 0-20 ppm of hydrogen fluoride, 0-300 ppm of sulfur dioxide component.

[0015] In addition, a second data acquisition device 5 is installed at the outlet of the electrolytic aluminum flue gas fluorine purification gas-solid separator, the second data acquisition device 5 comprises a particulate matter concentration sensor, a temperature sensor, a flow rate sensor, a hydrogen fluoride concentration sensor, a sulfur dioxide concentration sensor and a pressure sensor, the particulate matter concentration sensor, the temperature sensor, the flow rate sensor, the hydrogen fluoride concentration sensor, the sulfur dioxide concentration sensor and the pressure sensor are connected with a second data acquisition unit 6, and the second data acquisition unit 6 is electrically connected with an external power supply. The second data acquisition device 5 can detect the composition and state of the flue gas flowing out of the electrolytic aluminum flue gas fluorine purification gas-solid separator in real time, detect the flue gas treatment effect of the defluorination purification treatment adsorption reactor 1 and the electrolytic aluminum flue gas fluorine purification gas-solid separator, and send the particulate matter concentration, temperature, flow rate, hydrogen fluoride concentration, sulfur dioxide concentration and pressure data of the flue gas to the upper computer after being processed by the second data acquisition unit 6, so that the condition of the gas-solid separation flue gas can be mastered in real time, and the adsorption purification process can be ensured to be efficient, uniform, balanced, low-consumption and stable. The outlet of the electrolytic aluminum flue gas fluorine purification gas-solid separator requires that the flow rate in the flow field is not less than 4 m / s, the temperature is not higher than 150 DEG C, the flow field pressure is not less than -5000 Pa, and the flow field mainly comprises: the dust particulate matter is not more than 5 mg / Nm 3 , the hydrogen fluoride is not more than 4 ppm, and the sulfur dioxide is not more than 115 ppm.

[0016] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A gas-solid two-phase flow detection system for an electrolytic aluminum defluorination and purification system, comprising an adsorption reactor for defluorination and purification treatment and a gas-solid separator for electrolytic aluminum flue gas fluorination purification connected to each other, characterized in that: A first data acquisition device is installed at the inlet of the defluorination and purification adsorption reactor. The first data acquisition device is externally connected to a first data acquisition unit, which is electrically connected to an external power supply.

2. The gas-solid two-phase flow detection system for an electrolytic aluminum defluorination and purification system according to claim 1, characterized in that: The first data acquisition device includes a particulate matter concentration sensor, a temperature sensor, a flow rate sensor, a hydrogen fluoride concentration sensor, a sulfur dioxide concentration sensor, and a pressure sensor.

3. The gas-solid two-phase flow detection system for an electrolytic aluminum defluorination and purification system according to claim 1 or 2, characterized in that: A second data acquisition device is installed at the outlet of the electrolytic aluminum flue gas fluorine purification gas-solid separator. The second data acquisition device is externally connected to a second data acquisition unit, which is electrically connected to an external power supply.

4. The gas-solid two-phase flow detection system for an electrolytic aluminum defluorination and purification system according to claim 3, characterized in that: The second data acquisition device includes a particulate matter concentration sensor, a temperature sensor, a flow rate sensor, a hydrogen fluoride concentration sensor, a sulfur dioxide concentration sensor, and a pressure sensor.

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