The invention discloses a preparation and conveying
system for a constant-concentration solution. The
system is adopted for preparation of an alkaline solution or alkaline
salt solution used for removing SO3 components in boiler
flue gas, the
high concentration and basically-constant concentration of the solution can be ensured, the requirements of solute variety changes, control over the solutiontemperature range, adjustment for the spraying amount of the solution and the like can be met, and the
system comprises a preparation and conveying controller, a constant-concentration solution preparation device, a solution storage device and a solution conveying device. In the constant-concentration solution preparation device, a first
liquid level sensor is used for detecting the liquid levelof a first solution in a preparation tube, a
solvent control unit is used for controlling a
solvent addition device to add a
solvent into the preparation tube according to the liquid level of the first solution, and a solute
control unit is used for controlling a solute addition device to add a solute into the preparation tube in an amount
control mode according to the addition amount of solvent every time by the solvent addition device and the solute
solubility corresponding to the temperature of the first solution, so that the constant concentration of the solution is maintained. The systemhas the technical
advantage that the constant concentration, the constant temperature and efficient and sustainable preparation are achieved.