Preparation device of lime slurry for waste incineration flue gas purification

Abstract

The invention provides a preparation device of lime slurry for waste incineration flue gas purification, in the preparation process, the temperature detection and control are added, and at the same time, the feeding control is improved and the system accuracy is improved to prepare the lime slurry meeting concentration requirements. The preparation device includes a preparation tank and a lime bin, the preparation tank is provided with an agitator, the upper part of the preparation tank is provided with a water inlet and a lime inlet, the lower part of the preparation tank is provided with an outlet communicated to a storage tank, and the outlet is provided with a preparation tank outlet valve, and the preparation device is characterized in that: a lower outlet of the lime bin is communicated to a lime dosing screw, a frequency changer is externally connected with a feeding screw of the lime dosing screw, a controller is externally connected with frequency changer, a water inlet valve is externally connected with the controller, the water inlet valve is connected with the water inlet through a pipeline, and a water meter is arranged on an outer water pipe of the water inlet valve.

Description

technical field [0001] The invention relates to the technical field of lime pulping, in particular to a lime slurry preparation device for waste incineration flue gas purification. Background technique [0002] In the semi-dry process of waste incineration flue gas purification system, the prepared lime slurry is evenly sprayed into the reaction tower through a high-speed rotating atomizer. Lime slurry reacts with HCl, SOx, HF and other acid gases in the hot flue gas flow. The sprayed lime slurry evaporates and cools the flue gas to about 150°C to 160°C, and produces a dry powdery reactant CaCl 2 , CaF 2 , CaSO 3 and CaSO 4 Wait. This cooling process also causes condensation of dioxins, furans and heavy metals. Therefore, lime slurry plays an important role in the semi-dry process of flue gas purification. However, the preparation of lime slurry from quicklime is an exothermic reaction. In the existing lime slurry preparation device, water is added at one time after c...

AI Technical Summary

Problems solved by technology

However, the preparation of lime slurry from quicklime is an exothermic reaction. In the existing lime slurry preparation device, water is added at one time after calculating the lime weight and water weight respectively, and then mixed with lime and stirred in the preparation tank. During the process, too high temperature will increase the measurement error of the thermal instrument, and even cause the weight loss of the measurement scale, which may cause a large change in the concentration of the lime slurry and affect the normal operation of the atomizer.

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