SU1585419A2 - Heat recuperating apparatus - Google Patents

Abstract

The invention relates to paper machinery, can be used in the pulp and paper industry for heat recovery vapor mixture of paper machines for drying paper and ventilation and is an improvement on the device auth.St. N 1008322. The purpose of the invention is to increase the thermal efficiency of the unit while ensuring reliability in operation. The unit contains heat exchangers for drying 1 and ventilating air 2, a scrubber 3, an exhaust fan 4, a collection of 5 heated water, a receiving chamber 6. The unit also has an irrigation chamber 7 with channels 8, and the exhaust path is equipped with a shaft 9 with a heat trap 10, inside which are installed sections heat trap and channel for the passage of steam-air mixture. Channels 13 and 16 are available to regulate the flow of air-vapor mixture and external air. Due to the fact that ventilation shaft 9 is equipped with a heat trap 10 for heating external air, in winter, before it is fed to the heat exchanger 2 of ventilation air, the latter is frozen and the thermal efficiency of the unit increases. 3 il.

Description

SP

00

sd

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noyaosti bunnashiny

exhaust fan 4, heated water collection 5, receiving chamber 6. The unit also has an irrigation chamber 7 with channels 8, and the exhaust path is equipped with a shaft 9 with a heat trap 10, inside which are installed heat exchanger sections and a channel for the passage of steam-air mixture. To regulate vapor / air flow and Q

The invention relates to papermaking machinery and can be used in the pulp and paper industry for recovering the heat of the vapor-air mixture of papermaking machines during paper drying and ventilation.

The purpose of the invention is to increase the thermal efficiency of the unit while ensuring reliability in operation.

 Figure 1 shows the heat recovery unit, a general view, a section of FIG. 2 is a section A-A in FIG. 1 (heat trap); in fig.Za, b - section bb in fig. 2 (heat trap when working in summer and winter periods). 1 The heat recovery unit contains heat exchangers for drying 1 and ventilation 2 air, scrubber 3, exhaust fan 4, collection 5 with 1 water and receiving chamber 6. The unit also has an irrigation chamber 7 with channels 8, the inlet part of which is connected with the heat exchanger drying air, and the output - with. ventilation heat exchanger, air.

The exhaust tract of the unit is equipped with an exhaust shaft 9 with a heat trap 10, inside of which there are sections 11 of the heat trap and channel 12 for the passage of the vapor-air mixture. To regulate the flow rate of the vapor-air mixture and external air, the heat trap is equipped with control valves 13-15. To regulate the flow of ventilation air, mine the heat trap 10, a valve 16 is provided.

The heat recovery unit operates as follows.

The steam-air mixture from the dryer part of the paper machine enters the receiving chamber 6, and then in the section of thermal air there are valves 13 and 16. Due to the fact that the ventilation shaft 9 is equipped with a heat trap 10 for heating the outside air, in the winter season, before feeding it to the heat exchanger 2 ventilating air prevents freezing of the tubes of the latter and increases the thermal efficiency of the unit. 3 il.

exchanger 1, where it gives heat to the drying air, then the vapor-air mixture through the channels 8, skirting the collection 5 of heated water, enters the upper part of the irrigation chamber 7..

Then, the vapor-air mixture enters the sections of heat exchanger 2 in the winter. Where heat is transferred to the ventilation air, and in the summer, it passes through the ventilation shaft, heat exchanger 2 passes.

Next, the vapor-air mixture enters the scrubber 3 for heating warm water for technological needs. Heated water flows into the collection of 5 heated water. From the scrubber 3, an air-vapor mixture with a temperature of ZZ-AO C is blown by means of a fan 4 into the exhaust shaft 9 with a heat trap 10 for heating outside air in winter.

The outside air in winter at air temperature below -10 ° C enters the heat exchanger 2 for heating the ventilation air, which is preheated in the heat trap 10, and can also flow into the inlet path of the winter operation mode through the control valve 16.

Outside air flow is controlled by valves 13 and 16.

The flow rate of the vapor-air mixture removed to the atmosphere through sections 11 of the heat trap 10 and the channel 12 for the passage of the vapor-air mixture is controlled by valves 14 and 15.

Claims (1)

When the outside air temperature is below, it is advisable to periodically turn off the supply of ventilation air through the heat trap 10. Invention formula Heat recovery unit for auth.St. No. 1001В322, which is also distinguished by the fact that, in order to increase the thermal efficiency of the agreh-at, while ensuring reliability in operation, the ventilation shaft of the steam-air mixture removal is equipped with a heat trap for heating the outside air in the winter period before it is supplied to / i but 6-5 a ventilation air heat exchanger; in this case, the heat exchanger has a duct connecting it to the ventilation shaft in the summer period, and valves regulating the flow of external air and the vapor-air mixture. FIG. 2 6-6 AND