A kind of ball mill control device
(1) technical field
The present invention relates to a kind of ball mill control device, particularly a kind of coal-burning boiler intermediate storage-type Strategy of Ball Mill Coal Pulverizing System entrance hot blast control device.
(2) background technology
The intermediate storage-type Strategy of Ball Mill Coal Pulverizing System is a kind of coal powder grinding equipment, be subject to the impact of various different factors, operational factor constantly changes, and the ball mill outlet temperature is changed by humidity, coal pulverizer load, hot blast rate, the cold blast rate of coal-supplying amount, coal, the variation of recirculation air quantity; The ball mill entrance negative pressure is along with the variation of ball mill load, hot blast rate, cold blast rate, recirculation air quantity changes.Reason is that ball mill needs drier and the agent delivery of a large amount of hot blasts as coal dust, due to hot blast temperature and blast all very high, dust diameter is thick, the air door linear adjustment is poor, the hot air disperser aperture changes the impact of coal pulverizer outlet temperature and entrance negative pressure not only fast but also greatly, the simple hot-blast main's adjustment doors of leaning on can't meet ball mill outlet temperature and the control of entrance negative pressure accurate parameters, has increased coal pulverizer outlet temperature and entrance negative pressure and has controlled difficulty.
(3) summary of the invention
The present invention is in order to make up the deficiencies in the prior art, provide a kind of simple in structure, easy to adjust, guarantee that ball mill entrance negative pressure and outlet temperature not there will be significantly the ball mill control device that changes, can guarantee ball mill safety and stability reliability service.
The present invention is achieved through the following technical solutions:
A kind of ball mill control device, comprise ball mill, the ball mill porch connects feeder, exit connects mill exhauster, the ball mill porch connects hot air duct, be connected with the hot blast adjustment doors on hot air duct, it is characterized in that: described hot blast adjustment doors two ends are connected with bypass, and hot blast bypass adjustment doors is installed in bypass.
Be in series with the hot blast cut-off gate on described hot air duct, be parallel with cold-air flap.
The invention has the beneficial effects as follows: the total door of hot blast coarse adjustment for main force's air quantity, carry out fine tuning with little bypass air door, can guarantee that coal pulverizer inlet negative pressure and outlet temperature not there will be significantly variation, make the reliable and stable operation of whole ball mill long-term safety.
(4) accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Accompanying drawing 1 is structural representation of the present invention;
In figure, 1 ball mill, 2 feeders, 3 mill exhausters, 4 hot air ducts, 5 hot blast adjustment doors, 6 bypasses, 7 hot blast bypass adjustment doors, 8 hot blast cut-off gates, 9 cold-air flaps.
(5) specific embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.This embodiment comprises ball mill 1, and ball mill 1 porch connects feeder 2, and exit connects mill exhauster 3, ball mill 1 porch connects hot air duct 4, be connected with hot blast adjustment doors 5 on hot air duct 4, hot blast adjustment doors 5 two ends are connected with bypass 6, and hot blast bypass adjustment doors 7 is installed in bypass 6.Be in series with hot blast cut-off gate 8 on hot air duct 4, be parallel with cold-air flap 9.
Adopt a kind of ball mill control device of the present invention, main hot blast pitch is that hot blast adjustment doors 5 adopts original tongue type baffle plate constant, install a little bypass 6 additional on hot blast main road 4, a little air quantity is installed simultaneously, the guide-vane baffle door that linear adjustment is good is hot blast bypass adjustment doors 7, main hot air disperser and bypass air door are used in conjunction with, in the pulverized coal preparation system initial start stage, the ventilation needed is large, control 80% air quantity by hot blast adjustment doors 5, after normal operation, to adopt little bypass air door be hot blast bypass adjustment doors 7(with 20% air quantity) do the fine tuning fine setting, reach effective control and ask the purpose of grinding machine 1 entrance negative pressure and outlet temperature even running, fully can long-term safety stable operation by the ball mill control device after innovation.