Discharging control method, device and system

Abstract

The embodiment of the invention provides a discharging control method, device and system. A discharging valve at the bottom of a stock bin comprises an upper valve plate and a lower valve plate. The method comprises the steps that a first pressure value detected by a first pressure detector at a first detection point in the stock bin is acquired, a second pressure value detected by a second pressure detector at a second detection point in an upper-layer loading space located between the upper valve plate and the lower valve plate of the discharging valve is obtained, and a discharging control signal is generated according to the first pressure value and the second pressure value and sent to the discharging valve. According to the discharging control method, device and system, the pressure detectors can be additionally arranged on the upper portion and the lower portion of the upper valve plate of the double-layer dust discharge valve correspondingly, secondary dust discharge action is conducted by judging the differential pressure value between the upper portion and the lower portion of the upper valve plate, a valve door is tightly closed till dust is completely discharged, the situation that air is leaked due to the fact that the valve plates are clamped by particular materials is avoided, the ineffective air quantity of an exhaust fan and an air blower is decreased, and the energy saving and environmental protection effect is improved.

Description

technical field [0001] The present disclosure relates to the technical field of automatic control, in particular to a discharge control method, device and system. Background technique [0002] At present, the silo is a common equipment used to collect dust or small particle bulk materials in the field of sintering pellets. Generally, the silo is equipped with a blower to provide a positive pressure environment in the silo and / or a negative pressure environment in the silo In order to avoid air leakage between the outside air and the space inside the silo, a double-layer ash discharge valve is generally used at the bottom of the silo to unload the ash. After the dust or small particle bulk materials fall into the silo, it will pass through the double-layer ash discharge valve at the bottom of the silo. The upper valve plate and the lower valve plate of the layer discharge valve perform ash discharge in the order of first up and then down to discharge the material out of the s...

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Problems solved by technology

[0003] In practical applications, the time sequence control method is generally used for ash discharge, such as: multiple sets of double-layer ash discharge valves under the large flue, and the ash discharge is performed at a certain time interval (such as 1 minute) from the head to the tail of the sintering machine. Action, when unloading according to the time sequence control method, the double-layer ash unloading valve may not be able to unload the material with particles once, so when the upper valve of the double-layer ash unloading valve is closed, it is easy to be contaminated by the granular material stuck and unable to close

[0004] Since the upper valve cannot be closed tightly, when the air in the warehouse flows from the dust discharge valve to the warehouse under the action of the exhaust fan, it may cause air leakage from the double-layer dust discharge valve to the warehouse, which will cause the load of the exhaust fan Increase, the ineffective wind increases, wasting energy; when the air flow in the warehouse flows from the warehouse to the ash discharge valve under the action of the blower, it may cause air leakage from the double-layer ash discharge valve, resulting in the external environment of the ash discharge valve. Pollution, and part of the air used to cool the material leaks from the ash discharge valve, resulting in a waste of energy

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