RU2158624C1 - Overflow device - Google Patents

Abstract

FIELD: column apparatus. SUBSTANCE: device is used for liquid removal from mass-exchange, separating and filtering plates to step located below. It may also be used in column apparatus, for example, in gas drying absorbers, separators, filters or in sections of multifunctional mass-exchange apparatus. It has bent pocket with inlet and outlet branch pipes. Outlet branch pipe is shorter than inlet branch pipe, and it is provided with valve coupled to float. Float is positioned inside outlet branch pipe and coupled to valve arranged on outlet branch pipe and to tie-rod provided with lifting limiter and mounted for vertical displacement in guides secured on wall of outlet branch pipe by means of brackets. Lower part of outlet with detachable plug. Device ensures reliable operation of apparatus due to filling of it with process liquid during apparatus operation. EFFECT: enhanced efficiency. 2 cl, 2 dwg

Description

 The invention relates to a device for draining liquids from mass transfer, separation, filter plates to the underlying stage or to the bottom part of the apparatus. An overflow device can be used in column apparatus, gas dehydration absorbers, separators, filters or sections of multifunctional mass transfer apparatuses.

The main requirements for overflow devices to ensure the reliable operation of the apparatus in which they are used, and set out in the Handbook edited by Sudskova E.N. Calculations of the main processes and apparatuses for oil refining ". M: Chemistry, 1979, p. 268, are:
- low hydraulic resistance;
- a sufficient amount of water lock, excluding the breakthrough of steam;
- ensuring the flow through the overflow device of a given amount of liquid without flooding.

 Known designs of overflow devices (Polytechnical Dictionary. - M.: Soviet Encyclopedia. 1980, p. 480), made in the form of curved pipes with a bend of different lengths or pockets of pipes, the output of which is lowered into a vessel of a large area below its overflow edges.

 The main disadvantage of these overflow devices is the need to prefill the overflow devices (water traps, siphons) with liquid or let the liquid into the apparatus before gas is supplied to it, which is difficult. For example, in the north, pre-filling water gates can lead to their freezing. Sometimes it is necessary to fill the hydraulic locks of overflow devices with technical fluid, which has not been worked out by the process.

 Known overflow device (copyright certificate N 375077, class B 01 D 3/20), which partially eliminated the above disadvantages due to the use of a valve installed at the outlet of the overflow. However, the spring-loaded valve increases the hydraulic resistance of the overflow, which requires an increase in the height of the overflow pipe, and, consequently, the apparatus, since when opening due to a column of liquid, it drastically drops the liquid and exposes the water seal.

 Known overflow device (copyright certificate N 401371, class B 01 D 3/20), selected as a prototype, in which the valve regulating the cross-section of the overflow associated with a float placed on a plate. In this device, the higher the liquid level on the plate, the larger the inlet section for the passage of liquid into the overflow (pocket). The disadvantage of this device is the need to regulate the cross section of the passage of fluid through the overflow, regardless of the presence of a water seal at the outlet of it.

 The aim of the invention is to provide, along with the basic requirements for overflow devices, the reliable operation of the apparatus due to the filling of the overflow device with process fluid during operation of the apparatus and to prevent emptying of the overflow device during pulsating operation modes of the apparatus.

 This goal is achieved by the fact that in an overflow device containing a curved pocket with an inlet pipe and an outlet pipe, which is shorter than the inlet and equipped with a valve connected to the float, the float is installed inside the outlet pipe and connected to a valve located on the outlet pipe, with a rod equipped with a limiter lifting and placed with the possibility of vertical movement in guides mounted on the wall of the outlet pipe brackets. The lower part of the outlet pipe is located below the lower part of the inlet pipe and is equipped with a removable plug.

 The implementation of the overflow device with a float installed inside the outlet pipe and connected to a valve located on the outlet pipe, a rod equipped with a lift limiter and placed with the possibility of vertical movement in the guides mounted on the wall of the outlet pipe with brackets, made it possible to automatically fill it with process liquid without opening the apparatus, which eliminates the need for preliminary filling of the overflow device and emptying in pulsating modes p bots apparatus.

 The fact that the lower part of the outlet pipe is located below the lower part of the inlet pipe and is equipped with a removable plug, it is possible to use it as a collection of mechanical impurities, which can be removed as the collection is filled.

 The applicant does not know the designs of overflow devices in which the goal would be achieved in this way.

 The figure 1 shows the overflow device with a closed valve, figure 2 - overflow device with an open valve.

 An overflow device 3, made in the form of a curved pocket, consisting of an inlet pipe 4 and an output pipe 5, is attached to a plate 1 mounted on the body 2 of the device. A valve 6 is located on the output pipe 5 connected to the float 7 by a rod 8 located in the guides 9, fixed by a bracket 10 on the wall of the outlet pipe 5, and the rod 8 is equipped with a lift limiter 11. The lower part of the outlet pipe 5, which is located below the lower part of the inlet pipe 4 and forms a collection of mechanical impurities, is covered by a removable plug 12 th.

 Overflow device 3 operates as follows. In the absence of liquid on the contact, filter or separation plate 1, the valve 6 of the outlet pipe 5 under its own weight, the weight of the rod 8 and the float 7 is closed (Fig. 1). Gas does not pass through overflow device 3 (when gas passes, the liquid will not drain through the water trap). As the fluid flowing from the filters, separation devices or overlying plates onto the plate 1 accumulates, the hydraulic shutter is filled, the inlet pipe 4 and the outlet pipe 5 of the overflow device 3. When the outlet pipe 5 of the overflow device 3 is filled with liquid, the float 7 pops up and opens the valve 6 ( Fig. 2), attached to it using a rod 8, moving along the guides 9. The fluid flows from the overflow device. The volume of the float is selected so that the weight of the displaced liquid is greater than the weight of valve 6, float 7 and rod 8. When the pressure drop on the plate 1 increases and the gas flow increases sharply, valve 6 closes, preventing the liquid from escaping from the overflow device 3.

 The lift limiter ensures that the float is ejected from the nozzle.

 Mechanical impurities are removed from the lower part of the outlet pipe 5 as they accumulate by removing the plug 12.

 Thus, the design of the proposed overflow device does not require pre-pouring liquid into it, since it is automatically filled with process liquid during the operation of the device, and with pulsating modes of operation of the device, the emptying of the water seal is eliminated, thus making it possible to operate the device without opening it, which is especially laborious for equipment operating at high pressures.

Claims (2)

 1. An overflow device containing a curved pocket with an inlet and outlet pipe, which is shorter than the inlet and equipped with a valve connected to the float, characterized in that the float is installed inside the outlet pipe and connected to a valve located on the outlet pipe, a rod equipped with a lift limiter and placed with the possibility of vertical movement in the guides mounted on the wall of the outlet pipe brackets.  2. An overflow device according to claim 1, characterized in that the lower part of the outlet pipe is located below the lower part of the inlet pipe and is equipped with a removable plug.

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