Ash water scale inhibitor as well as preparation and screening test methods thereof

Abstract

The invention discloses an ash water scale inhibitor as well as preparation and screening test methods thereof. the ash water scale inhibitor is prepared from raw materials in percentage by weight as follows: 2%-10% of HEDP, 10%-15% of 2-phosphonobutane-1,2,4-tricarboxylic acid, 20%-30% of a maleic acid-acrylic copolymer, 10%-20% of hydrolytic polymaleic anhydride, 5%-10% of an acrylic acid-hydroxypropyl acrylate copolymer, 5%-15% of a phosphono-carboxylic acid copolymer, 5%-10% of an acrylic acid-2-acrylamide-2-methyl propane sulfonic acid copolymer and the balance of purified water. The prepared ash water scale inhibitor has calcium resistance, pH resistance and high-temperature resistance, has good corrosion and scale inhabitation performance, has good scale inhibition and prevention effects and is applicable to ash water with water quality characteristics of high temperature, high alkali and high pH, particularly to a power plant ash removal system. The ash water scale inhibitor screened with the ash water scale inhibitor screening test method reaches the expected corrosion and scale inhabitation effects, and the hydraulic ash removal efficiency is improved.

Description

technical field [0001] The invention belongs to a scale inhibitor and its preparation and screening test method, in particular to a gray water scale inhibitor and its preparation and screening test method. Background technique [0002] At present, China's electric power is still based on coal-based power generation structure, so the problem of fly ash treatment is very prominent, there are two main treatment methods, one is dry ash removal, which is more used in water-scarce areas; the other is Use hydraulic ash removal method to discharge to ash storage yard for storage. It is a relatively economical method to send ash and slag to the ash yard by hydraulic ash removal system, which is also the main method of ash removal in China at present. However, when using hydraulic ash removal, due to the scaling factor Ca contained in gray water 2+ with water CO 3 2- CaCO 3 Deposited on the inner wall of the ash flushing pipe, as the running time increases, the fouling on the inn...

AI Technical Summary

Problems solved by technology

However, due to the special water quality requirements of gray water, the Ca of gray water 2+ The ions and pH values ​​are much higher than those of general industrial water. The pressure of the gray water system in actual use is 4.0-8.0 MPa, and the temperature of the gray water is generally 150-300 ° C. The calcium resistance of the gray water scale inhibitor, Both pH resistance and high temperature resistance have certain limitations. Some gray water scale inhibitors will have a problem of lower scale inhibition rate under the actual high pH of gray water and different high temperature conditions.

How to prepare a gray water scale inhibitor and quickly and simply screen and test the gray water scale inhibitor formula with good scale inhibition performance under the actual gray water temperature scaling conditions, so that the added gray water scale inhibitor can meet the expectations It is a problem that needs to be solved to avoid the phenomenon that the gray water scale inhibitor added will reduce the scale inhibition rate and affect the hydraulic ash removal under the actual gray water temperature scaling condition.

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