SU1527455A1 - Heat-utilization scrubber - Google Patents

Abstract

The invention relates to a technique for cleaning and utilizing heat from flue gases and may find application in a power system. The aim of the invention is to increase the degree of gas purification and heat recovery. The scrubber-heat exchanger includes inlet 1 and outlet 2 angled sections, tubular 3, transverse rows of nozzles 4, respectively, on the upper and lower walls of portion 1, pallet 5, tubular 8 mounted on the lower wall of portion 2. Dusty hot gases are supplied through the pipe 10, the liquid sprayed through the nozzles 4 picks up dust from them and enters the tubular 3. Part of the droplets, reflecting, gives off heat to the tubular 8, and the liquid with dust particles is discharged into the pallet 5. The cleaned and cooled gas enters the exit section 2 sep riruets on shutters 9 and is withdrawn through conduit 11. 2 yl.

Description

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The invention relates to a technique for the purification and utilization of heat from flue gases and may find application in heat and power engineering: in boiler houses operating on solid fuel, in the pulp and paper, chemical and other industries,

The purpose of the invention is to increase the degree of gas purification and heat recovery.

FIG. 1 schematically shows a scrubber-heat exchanger, side view, in FIG. 2 - the same, top view.

The body of the apparatus consists of a downward angle at the entrance angle 1 and 1 upwards at an angle at the exit section 2. On the upper wall of section 1 there is one part of the tube 3, on the bottom wall installed in the transverse rows of the nozzle 4, Each subsequent row of nozzles has a larger angle inclination of the nozzle axis to the horizon than the previous one. Between sections 1 and 2 in the bottom wall there is a pallet 5 with a screw 6 placed in it. The pallet is provided with a nozzle 7. A second part of the tubular 8 is fixed above the liquid surface in the pallet 5 and on the bottom wall of the section 2. The apparatus is provided with nozzles for inlet 10 and outlet 11 for gas.

Scubber-heat exchanger works as follows.

Dusty hot gases (for example, products of combustion of solid fuels) are fed through pipe 10 into the inlet area 1 of the apparatus. A portion of the heat of the gases as a result of their direct interaction with the tube 3 is transferred to it. The liquid sprayed through the nozzles k into the gas stream picks up dust from it and absorbs most of the heat while heating up. The heated liquid in the form of droplets falls on the tubular 3, partially transferring heat, perceived by it, from the gas. Some of the most energetic drops, hitting the tubular, break up on it and reflect downwards. Some drops are combined in trickles and together with the reflected drops fall on the lower tube 8, previously crossed the gas path and perceived heat from the gas. Having given off heat to the tubular 8, the liquid, together with the captured dust particles, is drained into the pallet 5, where sedimentation of the liquid occurs. Clarified layer

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fluids are discharged through pipe 7, and the sludge is periodically discharged by the screw 6.

The cleaned and cooled gas enters the exit section 2, here the droplets are separated into the louvers 9, and then the gas is discharged through the nozzle 11.

The proposed form of the case of two sections inclined towards one another provides an active dynamic effect of gases on the lower tubular 8, increasing the heat transfer from the gas to the tubes.

The tubular 3 positioned on the upper wall does not prevent the passage of gas. Liquid drops flying between the tubes are reflected by the upper wall of the apparatus, perceived heat from it, and fall back on the tubes, giving them this heat.

The second part of the tube 8, installed above the surface of the liquid in the base 5 and above the bottom wall of the exit section 2, also perceives both direct drops, and jets, and reflected ones.

Such a position of the tubes practically does not constrain the gas path and causes an increase in the degree of utilization of gas heat due to an increase in the intensity of heat exchange.

The nozzles 4 of the first in the course of the gas range have an almost horizontal axis. The torch from them is directed mainly horizontally, it contributes to the advancement of gas, compensating to a large extent the resistance of the apparatus. This torch has the shortest contact time with gas before the drops meet with tubes 3 and 8, but it contacts with the hottest gas, therefore it perceives a large amount of heat from the gas. This torch acts on the far edges of the tubulars.

The farther the row of nozzles is located, the more vertical their spray plumes, the longer the contact time of all the liquid in the torch with gas in direct and reverse flight.

And although in this case contact with the gas, which has already given off some heat, occurs, due to the longer interaction time, the degree of heat capture remains high. The torches from these nozzles affect more and more areas of tubulars near the entrance, i.e. uniform tubular irrigation is provided, uniform, and therefore more heat is transferred from the fluid to the tubes.

With this arrangement of the nozzles, a large part of the apparatus volume is occupied by direct and reverse droplet flows, which ensures a high degree of gas purification.

The location of the pallet 5 between the inlet 1 and the outlet 2 of the body sections, inclined towards one another, ensures the free discharge of all the liquid and the flushing of particles captured from the gas deposited on the walls into the pallet 5.

The use of the invention allows to increase the degree of gas cleaning from dust and the degree of heat utilization. At the same time, the resistance of the gas path decreases sharply and the reliability of the apparatus operation when working with a contaminated gas increases, since the pipes become much less deposited

SRI.

Claims (1)

Invention Formula A scrubber-heat exchanger, comprising a housing with a tray, nozzles and irrigated tubular, characterized in that, in order to increase gas purification and heat recovery, the housing is made of two inlet and outlet sections inclined towards one another, a portion of tubular is fixed on the upper wall of the inlet in the lower wall between the areas of the other part of the tube is fixed above the surface of the liquid in the sump and on the lower wall of the outlet section, and the nozzles are made with a successively increasing angle n clone their axes to the horizontal and then installed on the bottom of the bottom wall of the inlet portion. eleven . FIG. 2