Stable operation of reciprocating grates in a large heating project
A large centralized heating project in a provincial capital city in the north undertakes the winter heating task for a hundred thousand households, and places extremely high requirements on the stability, reliability and efficiency of the boiler combustion equipment. The project finally selected the reciprocating grate of our partner factory, which has now run for 5 heating seasons.
The project faces two core challenges: first, the heating period is long (as long as 6 months), and the equipment needs to operate continuously and stably, with an extremely low failure rate requirement; second, the fuel is locally produced low-grade bituminous coal with high moisture and large ash content, so the combustion efficiency and heating effect need to be guaranteed. Our partner factory customized the HZL-40 reciprocating grate for the project requirements, and guaranteed stable operation through three major technical innovations.
First, reinforced heat-resistant grate plates are used, and the high-temperature strength is improved through a special heat treatment process, which solves the problem that traditional grate plates are easily damaged at high temperature; in 5 heating seasons only 3% of the grate plates were replaced, far lower than the industry average level. Second, the drive system of the movable grate was optimized, with a variable-frequency motor and a precision reducer adopted, making the grate movement smoother and reducing the failure rate by 80%.
Finally, an intelligent control system is provided, which can automatically adjust the reciprocating frequency and the air supply volume of the grate according to the outdoor temperature and the heating load, so that the combustion efficiency is stable above 95%, saving 10% fuel compared with the equipment originally used in the project, and saving more than 2000 tons of coal in one heating season. In addition, with the “one item, one code” service of our partner factory, operation and maintenance personnel can obtain the equipment parameters and maintenance guide by scanning the code, greatly improving the operation and maintenance efficiency.
