Level measurement under complicated working condition of the solution

Level measurement is very important in the production process and measurement, the role of the liquid level measurement is to provide production process with a real, to reflect the operating parameters of the liquid level is in its normal position, ensure orderly and safe production, liquid level measurement result as measurement basis, generally a higher accuracy. Level measurement methods have buoyancy type level gauge, static pressure type level gauge, ultrasonic level meter, radar level gauge, the radiation type level gauge & hellip; , etc. , these liquid level gauge according to process characteristic, so long as correct, basic can meet the needs of production, but in the case of some complicated process, need to determine the level measurement solutions according to the working condition characteristics, the alkali recovery workshop to discuss dissolving tank level measurement in level measurement under complicated working condition of the solution. 1. Complicated cases dissolving tank system is one of the main auxiliary equipment, alkali furnace dissolving tank is oval ( a = b = 9266毫米7200毫米h = 5000毫米) Carbon steel tank, dissolving tank wall thickness of 13 mm, its main function is to melt from the burning of alkali furnace ( Main ingredients Na2CO3 and Na2S, temperature about 900 ℃) Dissolved, its dissolution liquid using heavy chemical industry period of delivery to the rare white liquid to dissolve, blend to produce green liquid ( Named after the deep solution containing Fe2 + green) , the melt before the dissolved into liquid, use medium pressure steam blow it, its function is to reduce and eliminate the melt into soluble liquid explosion. Huge impact on dissolving tank liquid level control for the system safety, such as dissolving tank liquid level once the distortion, a large number of high temperature at the bottom of the molten material accumulation in the dissolving tank, operating personnel judgment and fill in the dissolving tank ( Or thin white liquid) , will have a huge explosion, equipment and personal safety. And dissolving tank in the high temperature melt blended with thin white liquor to produce large amounts of alkaline water vapor, to operating personnel can't judgment in the dissolving tank liquid level to the naked eye, it is safe and accurate liquid level measuring device is particularly important. 2. The influencing factors of liquid level measurement accuracy in the dissolving tank level measurement system, the factors that affect the level measurement accuracy are: (1) around 90 ℃ 900 ℃ or so of the melt in the thin white liquor, will produce a large number of vaporized steam; (2) although the melt with medium pressure steam blow after オ fell into the water, also can produce & other; PI & throughout; Explosions, because of the blow steam blowing Angle, nozzle nozzle corrode wait for a reason, the melt fell into the water will often produce large explosion; (3) the melt fell into the water, can produce fly, flying objects will be in the dissolving tank wall adhesion; (4) within the dissolving tank solution density change is big, the actual production of medium density in 1. 10× X10³ 公斤/立方米~ 1,25× 10³ kg/m³ 。 Between change; (5) within the dissolving tank solution Main ingredients of Na2CO3 and Na2S) Extremely easily, on the inner wall of the equipment scale, the dissolving tank each overhaul, on the inner wall of the tank has a thick layer of scale; 6 dissolving tank with four side wall installation of high-power agitator, the water in the groove counterclockwise, accelerate the dissolution of the melt, but has the certain influence on the level measurement accuracy. 3. Level gauge selection and the problems in as described above the dissolving tank level measurement system, we often encounter the following problems: such as selection of static pressure type measuring liquid level, differential pressure transmitter, pressure guide tube is easy to jam due to dissolve in the dissolving tank liquid density change is big, affect the measurement accuracy, ZUI big error may reach 15%. Such as selection of radar level gauge, vulnerable to splatter adhesion transmitting antenna and the bell mouth, vaporized steam will also launch on the antenna of condensing into water droplets, affect the measurement. If choose radiation type level gauge, dissolving tank wall as the change of time, scaling and thicken change will seriously affect the measurement result, because of the large diameter of the tank wall thickness, strength source selection is higher, in the dissolving tank maintenance quantity is big, selects the radiant liquidometer influence to the human body. If choose ultrasonic liquid level meter, easily affected by the explosion, at the same time affected by flying objects adhesion, ultrasonic level meter in the basic does not fit. The rest of the liquid level measurement, such as capacitance, buoyancy type level gauge, due to the effect of fouling cannot be used. 4. Solution due to the dissolving tank level control had a huge impact on system safety, production, according to the characteristics of the dissolving tank level measurement, we chose the two sets of level measurement running at the same time, two sets of level measurement solutions are as follows: 4. 1 with static pressure type measurement of density compensation scheme is shown in figure 1, 2 sets of differential pressure transducer is used to implement accurate level measurement, differential pressure transmitter 1 testing liquid density, differential pressure transmitter detection level 2. In the DCS system, use calculation formula for correction liquid level.

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