For example: "Abstract: This paper analyzes and discusses the solutions to the problems in the process of technical transformation of coal injection system in Tiantie blast furnace, and puts forward some views on the development direction of coal injection technology".

It can be revised as: "Abstract: The shortcomings of the original blast furnace coal injection system in Tiantie are mainly as follows: the feeding of each cone at the bottom of the injection tank is uneven, resulting in uneven injection at each tuyere of the blast furnace; The unreasonable layout of the injection port at the bottom of the injection box limits the further improvement of the blowing ability;

The coal injection quantity can only be adjusted by tank pressure, and the coal quantity fluctuates greatly, so it cannot be adjusted accurately; Low solid-gas ratio; Can't further improve the coal injection. Tiantie reformed the coal injection system of 1996- 1998 blast furnaces.

The key problems of technical transformation include: improving the quality of compressed air in injection system, partially transforming injection tank, adopting soft connection and local metering technology; Improve the distribution accuracy of pulverized coal; The injection test of coal injection branch pipe was carried out. "

2. Special characters in the abstract

Special characters mainly refer to various mathematical symbols, upper and lower corner signs and Greek letters. Because it can't be directly input into the computer, it needs to be converted into letters and symbols on the keyboard.

It is hoped that special characters and mathematical expressions composed of special characters will be used as little as possible in the abstract. Because their input is extremely troublesome and error-prone, which affects the accuracy and readability of the abstract itself, we should try not to use them, but use text expression or text narration instead. More complex expressions are almost difficult to enter and should be cancelled.