Digital hydraulic precision and energy saving control system for metallurgical step heating furnace

AEMETEC digital hydraulic control technology can realize the precise control of speed and position, the real implementation of the furnace stepping mechanism fast cycle in the operation of smooth start and stop of the furnace billet with light supporting function, suppress the large load change cycle operation of the impact on the speed stability, to avoid damage to the boiler water beam wrapped oxide refractory and blank surface shedding, prolong the maintenance life, precise control of a large step kiloton load into the furnace operation mechanism, and the load weight of potential energy, take no pressure control and energy recovery control circuit system, the energy consumption is reduced sharply, the new system installed power is reduced by 50%, or by our system transformation is complete, energy consumption fell by more than 60%, fully embodies the digital hydraulic high efficiency, accurate, stable, safe, reliable and excellent characteristic¡£

The main advantages of the hydraulic system of the energy recovery type heating furnace are as follows: the reduction of the hydraulic system. Due to the realization of the energy recovery, the hydraulic system installed power is greatly reduced, resulting in the entire hydraulic system becomes small. The number of hydraulic pumps, the number of motors, the number of high pressure filter are reduced. Tank volume, circulating pump, circulation filter, oil return filter, cooler specifications are reduced. So, the entire one-time investment to reduce. And other equipment related to the hydraulic system to reduce the one-time investment. Reduce the power of the motor, leading to the power supply and distribution system (electrical cabinets, cables, soft and other) water treatment, such as one-time investment to reduce. The cost of spare parts is reduced, and the long-term operation cost is reduced. Due to power saving up to 60% or more, the cost of electricity is reduced. Cooling water consumption is also reduced by 75%.

Example: The original design of the hydraulic station of the heating furnace of the hot rolling thick plate heating furnace is the high pressure plunger pump with 7x90KW motor drive flow rate of 260L/Min. Mainly used to control the step into the beam, step into the Liang Pingyi, steel and other hydraulic cylinders. Digital hydraulic energy saving control scheme is as follows:

• The original oil tank pump station remains unchanged;

• The hydraulic pump used by 6 units, 1 units in reserve, changed to 3, and 4 spare, three pumps are used to control the heating furnace stepping machine;

• Increase the accumulator set as an energy storage unit;

• The digital hydraulic balancing device is used to replace the original walking beam lifting hydraulic cylinder proportion control system, and the digital hydraulic control valve which is used for increasing the hydraulic pressure of the hydraulic cylinder and the lifting of the step beam;

• Digital hydraulic upgrade can not change the original hydraulic and electric control system, can be used with the system and compare the original online switch.