SU860794A1 - Heat mass exchange apparatus - Google Patents

Description

one

The invention relates to the field of processes and apparatus of chemical technology and can be used for carrying out mass exchange processes in chemical, petrochemical, food and other fields for the interaction of gas with a liquid.

Known contact apparatus with a floating nozzle, comprising a housing divided by the height of the failure plates 1.

This apparatus does not allow active heat and mass transfer, for example, when formaldehyde is absorbed by water, accompanied by the release of a large amount of heat due to the absence of heat exchange elements to remove excess heat.

The plates in this design are located at a considerable distance from one another in order to prevent the liquid phase from lowering the plate to the higher one, which leads to an increase in the height of the apparatus.

The absorber is known, in which water cooled zmeeviki 2 are placed on a failed plate.

The disadvantage of this apparatus is that it can operate at low gas velocities, a flow not exceeding 0.5–0.8 m / s, since there is no packing in this absorber. At high velocities of the gas phase, there is a drift of liquid from the plate to the plate. The efficiency of such a plate is low, as a result of which one theoretical 5 theoretical plate contains 3-4 real plates, which leads to large dimensions of the apparatus along the section. m and height.

Known mass transfer apparatus,

10 containing a housing divided by the height of the plates with a movable nozzle and with injection plates between them. 3 This apparatus operates at high pressure of the gas phase, which is accompanied by excessive energy consumption and additional phase heating, the possibility of leakage through the seals. This is unacceptable when carrying out such highly toxic processes as: formaldehyde absorption by water. This AP2Q can only work with a high-pressure blower or compressor, which complicates the equipment and technological process at all stages. In addition, “this unit does not contain any elements

25 active heat removal.

For these reasons, such an apparatus cannot be used to obtain formalin (37–40% formaldehyde solution in water), since the absence of heat removal leads to a desorption process.

A heat and mass transfer apparatus is known, comprising a body partitioned in height with plates with overflow devices, cap plates, a nozzle and oropleni nozzles located above the tube, a circulation pump and overflow pipelines located outside the body 4.

However, in such an apparatus, each section is not uniformly irrigated with liquid, which reduces efficiency.

The aim of the invention is to increase the efficiency of adsorption by providing a higher gas phase velocity and uniform irrigation of each section with liquid of different concentrations.

This goal is achieved by the fact that in the heat and mass transfer apparatus containing the body there are sections partitioned along the height of the plate, with a pulping device with a cap plate, nozzle and positioned | 1y. MyGyy spray irrigation nozzles, cylinders: us ||, HHCOCj and located - corpus overflow pipelines, caps equipped with pockets, while the lower part of the pockets is connected with a circulation pump to irrigation nozzles, their upper part with overflow pipelines whose outlets are located in the irrigation zone of each section.

It is advisable to supply overflow pipelines with hydraulic locks, pockets with heat exchange elements, and the cap plate with a baffle plate and a reflective grid located under it.

The drawing shows the proposed apparatus, a longitudinal section.

The apparatus consists of a sectional body 1, in each section of which a dismountable FIT plate 2 with a floating nozzle 3 is installed. A non-plumbing cap plate 4 with heat exchange elements 5 is installed under each collapsed plate.

An external circulation pump 6 is connected on the suction side with a non-attaching cap plate, and on the discharge side is connected to 7 irrigation nozzles located above the failed plate.

There is a gas passage 8 in the middle of the cap plate. A baffle 9 is installed above the cap plate, and a reflective grid 10 is installed beneath the cap plate. The dip plate has an overflow device 1 1 with an anti-lock flap 12. The neural cover plate has a pocket 13 and an overflow pipe 14 with a hydrolock 15.

The device works as follows.

The reaction gas, such as formaldehyde, is introduced into the apparatus from below and successively passes all sections through the gas passage 8, the flow around the conical bump stop

through the holes of the collapsible sieve tray 2, and into the fluidized bed state the floating nozzle 3, on which contact and mass exchange takes place with the liquid phase supplied to the nozzle from the irrigation nozzles 7. The liquid phase from the failed sieve plates through the internal overflow devices 11 and hydraulic seals 12 flows onto the lower located non-neural cap plate 4 containing the heat exchange element emsng 5. On the neprovalny plates the heat exchange takes place, cooling the liquid phase. A liquid phase with a circulation pump 6 is fed to the nozzles 7 on the above-lying failing plate and irrigates the floating nozzle abundantly from a non-collar cap tray. This creates favorable conditions for the active contact of the phases. The finished product (formalin) is removed from the lowermost non-failable cap plate, fresh irrigation water is fed to the uppermost failing plate.

The proposed design has the following advantages;

high absorption efficiency is achieved due to the high velocity of the gas phase - 3-5 m / s, referred to the area

cross-section of the apparatus, developed contact surface of the phases and the possibility of removal of excess heat;

decreases the metal intensity of the apparatus, since its productivity increases without increasing the dimensions of the absorber; circulating pumps allow the creation of uniform and necessary irrigation density;

the design allows to obtain formalin of the desired concentration, for example, 37-40%, and ensures safe operation.

Claims (4)

1. A heat and mass transfer apparatus comprising a body partitioned in height by a plate with an overflow device, a cap plate, a nozzle and irrigation nozzles located above it, a circulation pump and overflow pipes outside the body, in order to increase the efficiency of adsorption by providing a high gas phase velocity and uniform irrigation of each section with a liquid of different concentration, the cap plate is equipped with pockets, while the lower part of the pockets It is connected with the help of a circulation pump with irrigation nozzles, their upper part with overflow pipes, the outlets of which are located in the irrigation zone of each section. 2. The apparatus according to claim 1, wherein the fact that the overflow pipelines are equipped with hydraulic seals. 3. The device on PP. 1 and 2, characterized in that the pockets are provided with heat exchange elements. 4. The device on PP. 1-3, characterized in that the cap plate is provided with a baffle and a reflective grid located under it. 6 Sources of information taken into account during exertization 1- USSR author's certificate oVe 39С7118, cl. On 01 About 53/20, 1970. 2. USSR author's certificate Ni 254482, cl. B 01 D 53/18, 19G9. 3. USSR author's certificate number 568441, cl. B 01 D 3/22, 1974. 4. USSR author's certificate No. 24520, cl. On 01 D 53/18, 1930.