| 摘要 |
The invention can be used in the food, chemical, petrochemical and petroleum refining industries. The inventive mass transfer contact device comprises a plate web (1) provided with a contact element (2), an additional plate web (5), a barrel (4) which is provided with holes (10, 11, 12) embodied along the circumference thereof, a movable two-way valve embodied in the form of continuous plates which are arranged one above the other and are connected to each other by means of a distance post (8). The novelty of the invention consists in that a housing (13) connects the external space of the contact element (2) to the internal space of the barrel (4) through the top row of the holes (12) embodied therein. The aforesaid features effect the following results: The lifting force exerted on the valve during its upward movement increases due to the maximal possible pressure difference applied to the upper plate (6) of the valve, as gas (steam) doesn't penetrate into the space over the upper plate. During the passing of gas (steam) to the contact element over the upper plate of the valve through the row of orifices (12) in the barrel (4) and in the housing (13), the dynamic thrust of the steam flow is deployed as an additional force, for support of the valve in the upper position. At a reducing or fluctuation of the gas (steam) expenditure for a fixed opening cross-section of the contact element for passing gas (steam), the valve descends to the level of orifices (12) row of the barrel (4) thereby creating a situational free cross-section for the flow of gas (steam) with a lower value but still sufficient for support of the valve in the upper position due to stabilization of the pressure difference applied to the plate. At a smooth closing of the gas (steam) flow, the valve, moving downwards, reduces the speed of its movement at the level of orifices (12) row of the barrel (4) and mildly, without an impact, touches the lower limiter (9) (the bottom edge of the casing), thereby extending durability of the valve. |
