1. Measurement principle of slurry density
The modification method for measuring the density of the absorption tower slurry this time is to install a slurry weighing system, hereinafter referred to as the "weighing method". The slurry is led out from the outlet pipeline of the gypsum discharge pump and connected to a weighing device for weighing. The slurry flows through the overflow pipe and outlet pipeline of the weighing device to the absorption tower trench. The slurry maintains a dynamic balance in the weighing system, ensuring that the slurry density in the weighing system is the same as that in the absorption tower in real time. The density measurement process of the weighing method is shown in Figure 1. The formula for calculating slurry density is:
ρ slurry=m slurry V
In the formula: ρ slurry is the density of the slurry, m slurry is the weight of the slurry in the weighing system, and V is the volume of the slurry in the weighing system. The weighing method can monitor the density of the slurry in real time, but it requires a reflux pipeline system based on the gypsum discharge pump, and the gypsum discharge pump is in continuous operation.
2. Equipment and Instruments
The weighing device consists of a PP material weighing container, weighing sensor, stainless steel shell, and equipment nameplate. The upper part of the weighing container is a cylindrical cylinder with a diameter of 300mm and a height of 300mm, and the lower part is a conical funnel with a 60 ° cone angle. A guide plate is set inside the funnel according to the direction of rotation of the slurry. The top of the weighing container is connected to the inlet pipeline and overflow pipeline, and the bottom cone bucket is connected to the outlet pipeline and outlet cut-off ball valve. The inlet pipeline is inserted into the weighing container and two 90 ° elbows are used to change the fluid flow direction. The weighing sensor is an S-type tensile weighing sensor, model PSD-S1/300kg, set in the center of the bottom of the weighing container. In order to evenly distribute the pressure, a weighing plate is placed on the top of the weighing sensor, and the weighing container is placed on the scale. The function of the stainless steel shell is to protect the weighing sensor from external factors and is not part of the gross weight of the weighing device, so its load-bearing capacity is not on the weighing device and it does not come into contact with the inlet and outlet pipelines and overflow pipelines.
The inlet pipeline, overflow pipeline, and outlet pipeline of the weighing device are connected to the outside world with rubber hoses, effectively reducing the impact of connected equipment on the weighing device. The overflow pipeline and outlet pipeline of the weighing device are led to the nearest ditch in the tower area through rubber hoses, and the slurry is pumped back to the absorption tower for reuse by the recovery water pump.
To measure the density of the slurry using the weighing method, the first step is to ensure that the gypsum slurry will not settle and will not be affected by the density gradient of the absorption tower slurry pool. The measured slurry is led out from the outlet pipeline of the gypsum discharge pump. It is necessary to ensure that the gypsum discharge pump runs continuously and that the discharged slurry can flow back to the absorption tower. This ensures that the slurry entering the weighing container is of uniform density in the absorption tower slurry pool. The slurry from the gypsum discharge pump outlet pipeline enters the weighing container through the inlet pipeline in a tangential direction, forming a vortex inside the container. With the assistance of the conical bottom guide plate, the vortex is discharged from the outlet pipeline, playing a stirring role for the slurry in the weighing container, preventing it from settling
