Coal water slurry addition agent, preparation method thereof and coal water slurry based on same

Abstract

The invention discloses a coal water slurry addition agent, a preparation method thereof and coal water slurry based on the same. The addition agent comprises the following components in percentage by weight: 55-90% of dispersant, 5-44% of stabilizer and 0.1-5% of PH regulator; the dispersant is one or mixture of several of polystyrene sulfonate and polyacrylate; the stabilizer is Arabic gum; and the PH regulator is sulfuric acid, nitric acid, sodium hydroxide or potassium hydroxide. The coal water slurry adopting the addition agent is the coal powder water slurry with the concentration of 68 percent which is prepared by enabling the weight of the addition agent to be 0.5-1.2% of the weight of dry-base coal powder, adding water and stirring well. The coal water slurry addition agent has good dispersibility and stability, the raw materials for preparing the addition agent has wide source and low cost, the preparation method is simple and easy to realize, and the addition agent has wide application range for coal types, low cost, low concentration and good stability. The coal water slurry which is prepared by adopting the addition agent has the apparent viscosity of 760mPa.s and can be stably stored for more than 30 days at 25DEG C and at the shear rate of 100S-1.

Description

Coal-water slurry additive, preparation method thereof, and coal-water slurry based on the additive technical field The invention belongs to the field of coal energy application, and relates to a novel coal-based fluid fuel additive, in particular to a coal-water slurry additive, a preparation method thereof and a coal-water slurry based on the additive. Background technique my country is rich in coal resources but lacks oil and gas, and coal still occupies a dominant position in the energy structure. Therefore, it is necessary to vigorously develop large-scale coal gasification technology to develop clean coal technology, improve my country's coal utilization rate, and reduce environmental pollution caused by coal combustion. Coal water slurry (CWS) is a mixture of 60% to 70% coal powder with a certain particle size distribution, 30% to 40% water and a small amount of additives. Coal water slurry is a new type of coal-based fluid fuel, known as a liquid coal product. It ...

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Problems solved by technology

Although a lot of research has been done on coal-water slurry research in my country, there are still problems such as narrow range of applicable coal types, high cost, low concentration, and poor stability.