Grey water antiscale dispersion agent for gasification

Abstract

The invention discloses a grey water antiscale dispersion agent for gasification. The antiscale dispersion agent is prepared from 35-50 percent of terpolymer, 10-30 percent of acrylate-hydroxypropyl acrylate, 20-30 percent of hydrolyzed maleic anhydride copolymer, 2-5 percent of phosphate, 5-15 percent of epoxy sodium succinate and a certain proportion of water. According to the antiscale dispersion agent, the static antiscale rate of calcium carbonate at 150 DEG C reaches more than 96 percent, the antiscale rate of calcium carbonate at 250 DEG C reaches more than 85 percent, and the antiscale rate of calcium carbonate at high pressure of 8.0Mpa and 250 DEG C reaches more than 77 percent. When the addition amount of the antiscale dispersion agent in gasification of grey water is 40-80ppm, calcium ions and magnesium ions can be dispersed, the scaling of the grey water is retarded, suspended solids, such as insoluble silicate and coal ash can be effectively dispersed, the problem of scaling of a gray water system in a gasification process is solved, and a device can continuously operate under the rigorous working conditions of long period and high load; water sources are saved and the call to environmental friendliness is responded.

Description

technical field [0001] The invention relates to an organic chemical composition, in particular to a gray water scale inhibitor and dispersant for gasification. Background technique [0002] my country is a country rich in coal, low in oil, and lacking in gas. By 2010, coal will account for about 60% of the primary energy consumption structure. Vigorously developing clean coal technology and utilizing my country's coal resources efficiently and cleanly will play an important role in promoting the coordinated development of energy and the environment. It is of extremely important strategic significance to meet the needs of the rapid and stable development of the national economy. [0003] As an important part of clean coal technology, coal gasification plays a pivotal role. So far, the most representative ones are Shell gasification technology with dry coal powder as raw material and Texaco gasification technology with coal water slurry as raw material. The black and gray wat...

AI Technical Summary

Problems solved by technology

And the system is different from general power plant boilers and oil refinery circulating water systems. The black ash water system of the gasification unit has a wide range of temperature changes (40-250°C), long residence time at high temperatures, and the residence time in areas above 150°C is about 30 minutes; the range of pressure changes Wide range (-0.09~6.5Mpa); wide pH variation (5~9); high suspended solids in black ash water; high content of calcium, magnesium and silicon ions; large flow rate changes, these factors together lead to the tendency of deposition and fouling in various parts of the system Difficult to control fine slag deposition and CaCO 3 , MgCO 3 deposition

And in the face of environmental protection requirements, the sewage discharge of many coal chemical enterprises is greatly limited, and the concentration multiple of the water system is constantly increasing, which makes the system with harsh water quality and environment worse, and is more prone to fouling. When the fouling is serious, it will affect the normal operation of the equipment.