Entrained-flow coal gasification black ash water settling and dispersing system and black ash water settling method thereof

Abstract

The invention belongs to the technical field of entrained-flow coal gasification, and provides an entrained-flow coal gasification black ash water settling and dispersing system and a black ash watersettling method thereof in order to improve the settling efficiency of entrained-flow coal gasification black water. A primary flocculant adding device is that a flocculation tank I is connected witha mixer I through a flocculation pump I; a secondary flocculant adding device is that a flocculation tank II is connected with a mixer II through a flocculation pump II; the mixer I and the mixer II are connected with a black water pipeline of a settling tank, the bottom of the settling tank is connected with a drainage pump, and the top of the settling tank is connected with the water inlet of abaffling clarifier through an overflow weir; the bottom of the baffle clarifier is provided with a drain outlet, the top is provided with a drain pipe, and the end of the drain pipe is connected withan ash water tank; the baffle clarifier and the ash water tank are connected with a dispersant tank through a dispersant pump. By adding different kinds of flocculants in the two-stage device, the purpose of reducing the total dosage of chemicals on the one hand and better settling treatment effect on the black water on the other hand can be achieved.

Description

technical field [0001] The invention belongs to the technical field of entrained bed coal gasification, and in particular relates to an entrained bed coal gasification black ash water settlement and dispersion system and a black ash water subsidence method thereof. Background technique [0002] The black (gray) water system is the key to the long-term and stable operation of entrained bed coal gasification, and the water quality of black (gray) water is the key to the operation of the black (gray) water system. Operationalization is very important. At present, in the process of black (gray) water settling and dispersing, it is necessary to add flocculant and dispersant respectively to improve the settling performance of black water and the performance of avoiding scaling. However, due to various reasons, it is easy to cause the gray water to have high turbidity and high solid content, which will lead to easy fouling of equipment and pipelines, which seriously affects the st...

AI Technical Summary

Problems solved by technology

However, due to various reasons, it is easy to cause high turbidity and high solid content in gray water, resulting in easy fouling of equipment and pipelines, which seriously affects the stable operation of the gasification system

For this reason, increase the volume of the settling tank or increase the amount of flocculant significantly, both of which will either increase the investment or increase the operating cost

Images