Wet limestone flue gas desulfurization system slurry density measurement way

Abstract: the wet limestone flue gas desulfurization system slurry density measurement information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. One, an overview of the limestone wet flue gas desulfurization system in at least two working medium density must be real-time accurate measurement, namely into the absorption tower of limestone slurry density and the absorber slurry discharge pump outlet pipe on the gypsum slurry density, the former is related to the desulfurization efficiency. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a wet limestone flue gas desulfurization system way slurry density measurement details. One, an overview of the limestone wet flue gas desulfurization system in at least two working medium density must be real-time accurate measurement, namely into the absorption tower of limestone slurry density and the absorber slurry discharge pump outlet pipe on the gypsum slurry density, the former is related to the desulfurization efficiency, the latter controls the absorber products quality of gypsum. However, because of the wet desulphurization system process is relatively complex, the two working medium density is not easy to measure. The limestone slurry and flue gas desulfurization process has the following characteristics: (contact l） Serum containing sulfuric acid root and sulfurous acid, weak acid, pH value generally in 5. 2 - 6. 2; （ 2) Serum containing 2% of chlorine ion and fluorine ions, and thus will accelerate acid corrosion; （ 3) In the limestone slurry solids content is higher, a 20% 30%; After desulfurization serous contains large amounts of gypsum crystallization, strong abradability. Slurry density measuring instrument selection, therefore, desulfurization system should fully consider the desulfurization serous corrosion, abrasion, suspended solids deposition, scale and other factors, as far as possible to give attention to two or morethings its availability, reliability and controllability. Second, several kinds of slurry density measurement method 2. 1 radioactive density meter radioactive density gauge measuring principle is rays pass through matter, happens when the attenuation attenuation depends on the measurement channel and the density of material, when the measuring channel is constant, attenuation is a function of material density. Radioactive density meter can not contact is detected object, especially in high temperature and high pressure, high corrosive and toxic, under the condition of the container material density measurement parameters, such as, the price is cheaper also. Used in desulfurization system, due to radioactive density meter from the slurry pipe installation, do not contact directly with serous, easy installation, small amount of maintenance and will not result in a serous pressure loss. Radioactive density meter, however, there are some disadvantages, such as measuring signals and concentration is not linear, pipe wall scaling and wear will cause measurement error, etc. In addition, in practical application, due to the radioactive equipment approval process trival, and carries on the strict management and check to the source, so this kind of density meter only in the early days of the desulfurization project in application. 2. 2 in the mass flow meter at present, zui widely used in flue gas desulfurization project of slurry density mass flowmeter is a measuring instrument, measuring tube continuously at a resonant frequency of vibration, the vibration frequency changes over the density of the fluid, so the resonant frequency is a function of fluid density, can be achieved by measuring the resonance frequency of the pipe fluid density. Zui trait of the mass flowmeter can measure the mass flow rate and density at the same time, and high measurement precision, stable running, but its zui shortcoming is easy to wear and tear, 1 - operation 2 years measuring tube must be replaced. Also, since the price of the mass flowmeter is increased as the nominal diameter of the pipeline increase rapidly, to save costs, in practical application are in the pipeline to measure alone leads to a branch to measure slurry density measurement. So, in the design to the precise measuring medium velocity in the tube, strictly controlled within 3 m/s. A certain power plant desulfurization media has all through a dramatic increase in density measurement tube tube caused by medium velocity, the mass flowmeter is ground in a short time. 2. 3 the differential method of density measurement method of differential pressure density measurement is the formula for computing the liquid pressure delta p = Pgh indirectly calculated the density of slurry ( The absorber slurry density measuring point position as shown in figure 1) 。 Type in the delta p is the differential pressure between two points from 2; G is acceleration of gravity; P for slurry density; H for the low voltage side pressure sampling position 1 and 2 high side pressure sampling position. Type of h as a fixed value ( Because of the position between two points 1, 2, can be designed in advance) , so only require a pressure difference between these two points can be calculated corresponding slurry density. Considering the limestone slurry easy crystallization solidification characteristics, differential pressure transmitter type selection for the flange diaphragm type ( With capillary) 。 Differential pressure method of measuring the advantage of slurry density is a simple, easy to apply to various types of absorption tower. But it also has some obvious defects: ( 1) Representative is poor, the measured density is limited within the scope of absorption tower ( Pressure measurements are between 1 and 2) The slurry density, does not represent a gypsum discharge pump outlet slurry density, so need to modify the measured density. （ 2) The measurement position is poor.
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