SU1728593A1 - Device for utilizing heat and cleaning flue gases - Google Patents

Abstract

This invention relates to heat engineering. Usage: gas cleaning from dust in chimneys and heating of process water at thermal power plants, heating installations and in industrial boilers. SUMMARY OF THE INVENTION: The device comprises high-temperature and low-temperature heaters, a housing placed in a chimney, oppositely directed inclined partitions along the height of the housing, a tank for cleaning water, and a nozzle for sawing water. A pressure air duct with a series of air-emitting nozzles in the form of a confuser is installed in the center of the case; a washer with suction inlets is installed at its base. The air, the passage through the confused nozzle, intensively ejects gases and increases their velocity. The gas-air mixture in the upper part is irrigated with liquid and heats the coolant in the preheater. 3 ill., 1 tab.

Description

The invention relates to heat engineering and can be used for cleaning gases of thermal power plants, heating installations and production boilers.

A device for wet flue gas cleaning is known, comprising a housing with inlet and outlet nozzles, a spray liquid dispenser disposed in the upper part of the housing, a first heat exchanger and a second heat exchanger for heating the purified gases.

A device is also known, in which the inlet and outlet ducts are made in the form of a single pipeline with a dividing wall between ducts,

which is equipped with nozzles, a dual liquid level damper, placed in the upper part of the liquid bath, a flue gas divider, a vibration device located in its lower part, auger and vane sealers and a deoxidizer dispenser located outside the liquid bath, the process water heater is made of two steps - low-temperature, placed in the exhaust duct, and high-temperature, placed in the inlet duct, while the supply duct is equipped with a cone barbate ohm immersed in the liquid bath tapered, and discharging flue vylolXI

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with a sloping area for condensate draining, and the nozzles are located in the upper part of the conical bubbler.

A disadvantage of the known installation is low efficiency.

The aim of the invention is to increase efficiency.

. It is known that when air flows through the confused passage nozzle in the air exit zone, a vacuum is created, which contributes to the ejection (leakage) of flue gases through the suction inlets due to the higher speeds of air flow through the confused passage nozzle.

It has been established that the ejection will be more effective if the suction inlets evenly surround the confused nozzle. It has been experimentally proved that the highest air ejection coefficient is achieved at an approximately equal ratio of the area of the confused passage nozzle to the total area of the surrounding suction holes.

The value of the coefficient of ejection Ke for various parameters of the device pr is set forth in the table.

This technical solution provides intensive ejection of flue gases and the creation of a vacuum in the device case due to the kinetic energy of the moving air flow through the confused nozzles of the transitional pipe. Smoke flue suction occurs between the partitions throughout the height of the device, and at the same time, a pressure drop (ha) between the chimney and the boiler furnace is maintained.

FIG. 1 schematically shows a device for heat recovery and flue gas cleaning; in fig. 2 — node I in FIG. one; in fig. 3 is a section A-A in FIG. 2

The device comprises a housing 1 placed in a chimney 2, the height of which is oppositely directed obliquely than the partition 3, between which a slit 4 is formed for the passage of liquid solution and flue gases. To maintain the required vacuum in the chimney 2 in the housing 1 in the center there is a pressure air duct 5 connected to the fan 6, while along the length of the duct between the partitions, a series of air-emitting pipes 7 are made t seen on the diffuser 8, at the base of which in the passage nozzle 9 installed washer. 10 with suction holes 11. At the top of the housing 1 there is a spray gun 12 irrigated

liquids on the low-temperature heater 13, inside the pipes of which the liquid solution moves, and the external surface is washed by flue exhaust gases,

which are simultaneously cooled and drained. The condensed moisture falls onto the surface of the inclined partition 3. In the lower part of the housing 1, a hot liquid collection channel 14 is made, connected by a pipe 15 with a liquid cleaning tank 16. The contaminated liquid enters the grid 17 and is cleaned of soot particles, which are discharged through the trap 18 into the sewer system. The cleaned and heated liquid solution to 70-80 ° C is taken up by the pump 19 and fed to the high-temperature preheater 20, where heat is taken off by the heat-transfer agent, and the cooled liquid solution is fed through the pipeline 21.

0 low-temperature heater 13. From the outer part of the tank 16 there is a metering device 22 with a mortar tank 23. The flue gases come from the boiler furnace (not shown) through the channel 24 to the flue gas

5 pipe 2.

The device works as follows.

Flue gases, passage channel 24, flow through the lower part of the chimney 2

0 into the housing 1. At the same time, the fan 6 and the pump 19 are put into operation. The fan 6, under pressure, supplies external air to the duct 5, and the pump takes the prepared liquid solution from the tank 16 and

5 feeds the spray liquid 12 to the sprayed liquid, while the liquid passes through the high-temperature heater 20, the pipe 21 and the low-temperature heater 13. The sprayed liquid drops out in the form of dispersed small droplets falling. Through the entire inclined surface of the partition 3 and a thin layer drains into the slit 4, where the meeting of two oppositely directed flows of liquid and flue gases occurs. The air from the fan 6 through the pressure duct 5 enters the confused nozzles 9 and creates a vacuum in the space between the inclined partitions 3. The air, the passage confused

0 nozzle 9 of the first row, significantly increases the speed of movement and thus creates the possibility of intensive ejection (aspiration) of flue gases through suction holes 11, made on the shay around the nozzle 9. The resulting air-gas mixture into the confusing nozzle 9 of the second row further increases speed and increases the intensity of the ejection of flue gases, contributes to

a significant increase in the speed of movement of flue gases through the slit 4, thus providing the necessary traction in the chimney 2. Next, the operation cycle repeats, and the gas-air mixture enters the upper part of the housing 1.

Heat and mass transfer between the liquid and flue gases occurs in the cracks over the entire area.

The meeting of two oppositely directed streams contributes to the cleaning and cooling of flue gases with simultaneous heating and contamination of the liquid solution. The moistened flue gas, moving upwards, washes the surface of the pipes of the low-temperature preheater 13, cools, and at the same time moisture vapors condense on its surface, droplets of moisture fall on the inclined partition 13. The cleaned and cooled flue gas is emitted into the atmosphere. The heated and contaminated liquid flows into the chute 14 and flows through the conduit 15 to the tank 16. In the tank 16, the liquid is cleaned of soot particles, and the sulfur and other compounds are neutralized. The black particles are trapped on the grid 17 and are thrown through the water seal 18 into the sewer system. Sulfur and other compounds are cleaned with lime. The solution flows into the tank 16 from the mortar tank 23 through the metering device 22. The liquid heated to 70-80 ° C from the tank 16 is picked up by the pump 19 and fed to the high-temperature preheater 20, in which the liquid is cooled by heat carrier and through , the pipeline 21 and the low-temperature heater 13 are fed to the spray gun 12 with the subsequent repetition of the cycle of operation.

This device allows to significantly increase the efficiency of exhaust and purification of flue gases due to more complete use of air movement supplied by the fan. In addition, the typification of the industrial manufacture of the device allows it to be used both on the construction and on the objects of working chimneys of boiler rooms.

Claims (1)

Apparatus of the Invention A device for heat recovery and flue gas cleaning, comprising a housing with supply and exhaust ducts, a high-temperature preheater with nozzles for supplying and discharging a heat-transfer fluid, a low-temperature preheater, a nozzle installed in the upper part of the housing, a water purification tank characterized by that, in order to increase efficiency, it is equipped with oppositely directed inclined partitions located along the height of the housing with a gap, discharge air duct connected to the fan ohm located in the center of the case with rows of air-emitting nozzles along its length, made in the form of a confuser with a washer installed at its bottom nozzle with suction holes around the nozzle, the total cross-sectional area of which is equal to the nozzle area, while the case is placed in a chimney and in the lower part it is provided with a chute connected by a pipeline to a water purification tank.