Coal gasification ash water scale inhibitor and preparation method thereof

Abstract

The invention provides a preparation method of a coal gasification ash water scale inhibitor. The preparation method comprises the following steps: carrying out oxidization and sulfonation on a natural polymer to obtain a sulfonation modified product; carrying out amination on 10 weight percent to 20 weight percent of the sulfonation modified product to obtain an amination modified product; enabling 40 weight percent to 60 weight percent of the amination modified product to be subjected to copolymerization reaction with one or more of acrylic acid and maleic acid under the action of an initiator, so as to obtain a copolymerized product; mixing 20 weight percent to 50 weight percent of the sulfonation modified product, the amination modified product and the copolymerized product to obtain the coal gasification ash water scale inhibitor. According to the preparation method provided by the invention, the sulfonation modified product obtained by carrying out the oxidization and sulfonationon the natural polymer, the amination modified product obtained by carrying out the amination on the sulfonation modified product and the copolymerized product are mixed and have a cooperative effectto be commonly used as the coal gasification ash water scale inhibitor; a high molecular polymer modified through oxidization and degradation, sulfonation, selective amination, grafting and copolymerization and the like and the finally obtained coal gasification ash water scale inhibitor has a high scale inhibition rate.

Description

technical field [0001] The invention relates to the technical field of industrial water treatment, in particular to a coal gasification ash water scale inhibitor and a preparation method thereof. Background technique [0002] The water system of the coal gasification plant is one of the important links to ensure the long-term stable operation of the gasifier. The pressure of the water system of the gasification device is 4.0-8.0 MPa, and the temperature is 150-250 °C. At the same time, the gray water is easy to scale with high hardness, high alkalinity, and wide pH range. During the operation of the device, it is often accompanied by pipe Scaling and blockage of roads, especially in the quenching chamber of the gasifier, black water pipeline, evaporative hot water tower, water washing tower, gray water heat exchanger, etc. are seriously fouled. The method often used to solve the problem of gray water scaling in coal gasification units is to add anti-scaling dispersants with...

AI Technical Summary

Problems solved by technology

However, the compound type coal gasification ash water scale inhibitor and dispersant based on organic phosphine series and polycarboxylic acid monomer agents gradually face the high production cost of raw materials such as acrylic acid and maleic acid, and the compound agent is harmful to high ash and high Poor adaptability of coal for calcium gasification. When the fouling of a domestic coal gasification device was serious, the gasification system had only been in operation for one month, and 95% of the inner diameter of the pipeline had been severely blocked by fouling.