Preparation and conveying system for constant-concentration solution

Abstract

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.

Description

Technical field

[0001] The invention belongs to the technical field of solution preparation, and particularly relates to a constant concentration solution preparation and delivery system. Background technique

[0002] Add alkali or alkaline salt (such as soda ash, sodium bicarbonate, trona, magnesium hydroxide, etc., hereinafter referred to as solute) to the flue gas to react with the sulfur trioxide (SO3) component in the flue gas, which can reduce The amount of ammonium bisulfate produced can reduce the dew point of sulfuric acid in the flue gas, reduce the corrosion of boiler tail equipment (such as air preheater) and reduce the effect of air preheater ash blocking. In order to control the reduction of the flue gas temperature after the solution is sprayed, the concentration of the sprayed solution should not be too low, so as to avoid a large amount of water entering the flue gas and the temperature is too low, resulting in excessive reduction of the heat absorption of the re...

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