Ultrasonic vacuum pump bubble removal system before measurement of gypsum slurry density

Abstract

The invention discloses an ultrasonic vacuum pump bubble removal system before measurement of gypsum slurry density, and belongs to the field of limestone and gypsum desulfurization of coal-fired units in thermal power plants. The system comprises a bubble removal box, an ultrasonic vibration device and a water ring vacuum pump, wherein the ultrasonic vibration device is mounted on the surroundingside wall of the bubble removal box; a gypsum slurry inlet is formed in the bottom of the bubble removal box, the top of the bubble removal box is connected with the water ring vacuum pump, and a liquid discharge port for discharging gypsum slurry to a density measuring device is formed in the upper part of the side wall. The system has the beneficial effects that the ultrasonic vibration deviceis matched with the water ring vacuum pump in a negative pressure pumping manner, bubbles in gypsum slurry flowing in from the bottom of the bubble removal box gradually move upwards under the actionof the ultrasonic vibration device, the bubbles gradually increases in volume, floats out of the liquid surface and breaks, the vacuum pump pumps air in the bubble removal box from the top, and negative pressure is formed at the upper part of the bubble removal box to accelerate the rise of the bubbles in the liquid and break of the bubbles on the liquid surface, so that the purposes of efficientbubble removal and decrease of the air bubbles in the liquid are achieved.

Description

technical field [0001] The invention relates to the field of limestone-gypsum desulfurization of coal-fired units in thermal power plants, in particular to an ultrasonic vacuum pump defoaming system before measuring the density of gypsum slurry. Background technique [0002] At present, the principle of limestone-gypsum desulfurization technology for coal-fired units in thermal power plants is that SO in flue gas 2 Chemically react with limestone, oxidize and crystallize to form gypsum, including SO 2 There are 4 steps of absorption, reaction with limestone, oxidation reaction and crystallization reaction. [0003] When the oxidation reaction in the third step occurs, excessive oxidizing air needs to be blown in; when measuring the density of the gypsum slurry in the absorption tower, the gypsum slurry is generally introduced from the body of the absorption tower, and a large number of bubbles are also discharged with the flow of the slurry. Tiny air bubbles adhere to the ...

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Problems solved by technology

[0003] When the oxidation reaction in the third step occurs, excessive oxidizing air needs to be blown in; when measuring the density of the gypsum slurry in the absorption tower, the gypsum slurry is generally introduced from the body of the absorption tower, and a large number of bubbles are also discharged with the flow of the slurry. Tiny air bubbles adhere to the gypsum crystals in the slurry, which greatly interferes with the accurate measurement of the density by the density meter, resulting in inaccurate measurement of the online density meter, large errors, and some even jumps in the value, which is harmful to desulfurization. The normal operation of the system and the absorption tower system has a great influence

[0004] The density measurement of gypsum slurry generally adopts mass flowmeter or tuning fork density meter. Both measurement methods are not suitable for the current application where there are a lot of air bubbles, similar to gas-liquid two-phase. To solve the problem of density measurement, it is necessary to focus on reducing the gas content of the slurry, restore the original characteristics of the gypsum slurry, and create favorable conditions for accurate measurement by installing a device to eliminate air bubbles

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