Digital differential control system for gas-liquid flow

Abstract

The invention provides a digital differential control system for gas-liquid flow, comprising a plurality of adjusting valves arranged on equipment to be controlled, wherein the plurality of adjusting valves sequentially consist of No.1 adjusting valve, a No.2 adjusting valve,..., and a No.n adjusting valve which are numbered according to the sizes of flow areas, the flow areas of the adjusting valves are respectively S1, S2... Sn, n is the valve number, the total flow area of all the adjusting valves is 2j-1, and j is the total number of the valves; and when the areas of the adjusting valves are arranged from large to small or from small to large, the areas of the valves are combined into a geometric progression, the common ratio is 1 / 2 when the areas of the adjusting valves are arranged from large to small, and the common ratio is 2 when the areas of the adjusting valves are arranged from small to large. When the load of the equipment to be controlled is freely adjusted within the range of 100%-0%, the liquid inlet quantity of an internal-combustion engine and a gas-fired boiler can be adjusted at one time and can be accurately adjusted due to the on-off of the valves, and the internal-combustion engine always works within an adaptive power range and a lower oil consumption region.

Description

【Technical field】 [0001] The invention relates to the technical field of flow control, in particular to a gas-liquid flow digital differential control system; it can be used for the flow rate of internal combustion engine fuel (gas, liquid), heat treatment furnace fuel, gas (fuel oil) boiler fuel, and chemical (gas, liquid) ingredients control. 【Background technique】 [0002] At present, the vast majority of internal combustion engines are reciprocating piston internal combustion engines, and the maximum power of reciprocating piston internal combustion engines is directly related to its displacement. In a reciprocating internal combustion engine, the amount of liquid (gas) entering is related to the position of the upper and lower limit points of the piston stroke, the diameter of the piston and the stroke of the piston, etc., but in fact the positions of the upper and lower dead centers of the piston stroke and the diameter of the piston are all It cannot be changed, the ...

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Problems solved by technology

The stepping motor adjustment is actually realized by controlling the rotation angle of the spool through the movement of the stepping motor, but this control method will cause two fatal shortcomings, one is that the rotation angle of the spool cannot be precisely controlled; The second is that it cannot be adjusted in one step during the adjustment process. When it wants to rotate to a certain position and angle, it must pass through adjacent angles to reach it. This makes the internal combustion engine and gas boiler cannot always work in the appropriate power range and lower fuel consumption area

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