1. Overview
With the continuous development of our economy, increasing demand for electricity, thermal power generation as the main force of China s power industry, capacity has increased rapidly. However, thermal energy consumption and serious pollution problems continue to highlight. Therefore reducing energy consumption, reduce pollution, it becomes urgent need to address power sector issues! The simplest, most easy, most provincial investment in equipment is to try to pour the right amount of water to the coal pile, the pile of coal on the coal field spray of water, coal dust can be greatly reduced, but the most important thing is wet coal into the boiler, the water molecules under the effect of high temperature, rapidly decomposed into oxygen and hydrogen and oxygen to support combustion, sufficient oxygen to the burning of coal more fully, reducing the ash and smoke, while hydrogen is in itself can combustion, but also to improve the furnace temperature, which greatly improves the thermal efficiency of tons of coal. So coal yard sprinkler control system came into being, and are widely used in various power plants.
2. System Description
the system of coal by the electric field around the valve control spray head valve control every two to four spray heads, the number of control points decided by the valve, the average of about 32 coal field to 64 sprinkler heads, that is approximately more than 20 valve, needs to start and stop control of two pumps, one with a preparation. As the spraying process controlled mainly by the time, so it needs very little input, but most of all the required output point, so use a flexible configuration points Twidoo PLC became the best choice. Twido PLC automatic control system as a whole host controller, the system s control center, which bears an irreplaceable role. In this control system, we chose the Schneider company s complete solution, choose the latest Magelis XBTG series of touch screen interactive interface, Twido PLC based touch screen came from the XBTG the control parameters, by calculating control the water pump and spray valve at the appropriate time on / off, to ensure accurate and stable operation of the system.
The automatic sprinkler control system consists of a Magelis XBTG2110 touch screen, a Twido PLC, contactors, low voltage electrical appliances such as heat, following a number of control components and other component. The CPU module with the main PLC Twido family TWDLMDA20DRT, the PLC powerful, not only support the commonly used floating-point, double-word functions, there are many ranking and find the maximum, minimum and other functions can be called directly, to bring a lot of programming convenience.
site operator input via the touch screen XBTG process control parameters, mainly the selection of pump spray valve selection, spray time, spray frequency, and send to TWIDO PLC. PLC to obtain the control parameters according to operator selection starts pump, and set the number of spray time and spray the value assigned to the corresponding time relay with counters, set to run according to the order, one by one on / off spray valve, spray water to the coals. When the system stops working, they will be programmed in order to turn off the pump, delay a few seconds and then close the spray valve to prevent water hammer.
3. Summary
We help Xiangshan Xiang Rong Machinery Company developed this coal field of automatic sprinkler control system is now widely used in Henan Hebi City, and Power Plant Phase II expansion project, Jiangxi Chenming Group Puqi power plants in Shandong coal field which many power plants. System with stable quality and excellent after-sales service has been recognized by the user, in the power industry also achieved a high profile, product demand. Schneider Electric, we have developed this control system the company also won the Heung-wing leadership and sales and technical personnel to wide acclaim. With the further development of power industry, environmental protection and energy saving aspects of the increasingly high demand for this coal field believe sprinkler control system demand has increased accordingly.