SU1521802A1 - Heat recuperation arrangement - Google Patents

Abstract

The invention relates to heat recovery devices in the ventilation systems of paper and board machines and can be used in pulp and paper and light industry. The aim of the invention is to ensure cost effectiveness due to the effective utilization of the heat of the mixture. The device comprises a receiving chamber 1 of an air-steam mixture with a filter 2, a funnel for discharging contaminated wash water 3, a recuperative heat exchanger 4 at one of the cooling stages with an air duct 5 and a drying air fan 6. The device has a system of flushing nozzles 7. The drying tank 8 is located behind the last stage of recovery, and its tube bundle 9 is connected to lines 10 and 11, respectively, of cold and hot water. Reactivation tank 12 is located outside the steam-air mixture flow and augers 13 and 14 are connected to tank 8. Tube bundle 15 of tank 12 is connected to lines 16 and 17, respectively, of hot and cold condensate. The steam heater 18 for reheating the drying air with the steam pipe 19 is connected to the annular space of the tank 12, and the air duct 20 of the air of general ventilation with the fan 21 is connected to the nozzle 22 for draining the air. Due to the closed cycle of the heat recovery system, the efficiency of the device is ensured. 1 il.

Description

{located behind the last stage 1) of operation, and its tube bundle 9 is connected to lines 10 and 11, respectively, of iTBeHHo cold and hot water. The reactivation tank 12 is located outside the flow of the air-vapor mixture and the screws 13 and 14 are connected to the tank 8. Pipe bundle 15 of tank 12 | is connected to lines 16 and 17 with hot and cold condensate

sat. The steam heater 18 for reheating the dry air with the steam pipe 19 is connected to the annular space of the tank 12, and the air duct 20 of the general ventilation system with the fan 21 is connected to the nozzle 22 for draining the air. Due to the closed cycle of the heat recovery system, the efficiency of the device is ensured. 1 il.

: The invention relates to heat recovery devices in the ventilation systems of paper and cardboard machines and can be used in the pulp and paper and light industry.

The purpose of the invention is to ensure cost-effectiveness due to the efficient heat recovery of the mixture. - In the drawing, a heat recovery device is schematically represented.

The device contains the following: chamber 1 steam-air mixture with filter 2, funnel 3 for removal of contaminated wash water, recuperative heat exchanger 4 at one of the cooling stages. Steam mixture with air duct 5 and drying air fan 6. The device also contains a system of flushing nozzles 7. The drying tank 8 of the continuously operating sorbing apparatus is located directly behind the recuperative heat exchanger 4 in the steam-air mixture stream, and the tube bundle 9 of the tank is connected at the inlet with the cold water line 10, and at the outlet with hot water line 11 . The reactive tank 12 of a continuously operating sorbent apparatus is located outside the steam-air mixture flow and the screws 13 and 14 are connected to a drying tank 8. The tube bundle 15 of tank 12 is connected at the inlet to the line 16 of hot condensate, and at the outlet to the line 17 of cold condensate. Steam heater 18 after drying of the drying air by the steam pipe 19 is connected to the annular space of the tank 12, and the air duct 20 of the general exchange valve

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With the fan 21, it is connected to the outlet 22 of the dried air.

The device works as follows o.

The steam-air mixture discharged from the drying part of the papermaking machine is fed into the receiving chamber 1 of the heat-recovery device, after which it passes through the filter 2 from the metal mesh, where it is partially cleaned of the fiber of the material being dried in it. Then, the purified vapor-air mixture passes through the regenerative heat exchanger 4 in one of the cooling stages (not shown elsewhere), in which the drying air is heated. 4 drying rooms heated in the heat exchanger: the sound through the duct 5 is led off by the fan 6 through the steam radiator 18 to the drying chamber. Next, the vapor-air mixture passes through the drying tank 8 of the sorbing apparatus. Capacity 8 is filled with an adsorbent, possessing absorption capacity, in-this. case of water vapor. The process of air drying in the tank 8; takes place in adiabatic conditions and due to the release of latent condensation of water vapor, the temperature of the drained air is higher than the initial one. If it is necessary to cool the drained air in the tank B, cold water is supplied from the pipe 10 to the tube bundle 9, and water is heated through the pipe 11 from the beam 9. The dried air of the desired temperature is drained from the device through the pipe 22 through the duct 20 by the fan 21 to the room. Reactivation of the adsorbent is carried out by heating it to a temperature at which the partial pressure of steam in it becomes greater than in the surrounding air. Such reactivation by heating the adsorbent with a hot condensate 5 passing through the tube bundle 15J is carried out in a tank 12 into which moisture adsorbent is supplied by the screw 13 from the bottom of the drying tank 8, the hot condensate enters the tube bundle 15 from the hot condensate pipe 16 and discharged from the tube bundle through the cold condensate conduit 17. The recovered adsorbent by the screw 14 from the lower part of the reactive tank 12 is supplied to the upper part of the drying tank 8. The steam released during the reactivation process in the tank 12 is discharged through the steam line 19 in the heater 18 to preheat the drying air. The cleaning of the surface of the filter 2 and the regenerative heat exchanger 4 from the fibers of the material being dried is carried out using a system of compact nozzles 7, which are put into operation as needed. The flushing water contaminated with the fibers of the material being dried and contaminated with corrosive gases flows down and out of the devices a through the funnel 3.

Use in the device as the last stage of recovery. The heat of the vapor-air mixture of a continuously operating sorbent apparatus allows the heat of the mixture to be utilized and thus significantly

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increase the efficiency of the heat-recovery device.

Claims (1)

Invention Formula Heat recovery unit containing steps for heat recovery of vapor-air mixture, receiving 10 chamber of this mixture, flush nozzle system, filter, drying and ventilation air fans, steam air heater for drying air, hot and cold lines f5 of water, cold and hot condensate, characterized in that, in order to ensure efficiency due to the effective utilization of the heat of the mixture, the last step of the steam-air mixture is made in the form of a sorbent apparatus25 thirty This consists of two tanks with an adsorbent, each of which has a built-in water tube bundle, one of which, drying, is located directly behind the last stage of heat recovery in the vapor-air mixture stream and its tube bundle is connected to the hot and cold lines. The fertile water, another tank, is reactivational, is located outside the steam-air mixture flow, its tube bundle is connected to the lines of hot and cold condensate, and the annular space is connected to the steam air heater for heating the drying air. Both tanks are interconnected by two screws of the counter-movement of the adsorbent sorbent. 35