SU1339344A1 - Device for recovering waste heat of effluent gases - Google Patents

Abstract

Invention m. used in commercial boilers equipped with drying units. The purpose of the invention is to increase the efficiency and quality of hot water. Contact and surface heat exchangers are installed for this purpose. The exchange economizers 23, 24. The contact economizer 7 is equipped with gas stage 25, connected via water, to the cold water supply line 22 through the heat exchanger 24, the heating side 26 of which is included in the condensate discharge line 18. The contact heat exchanger 23 is connected to the air outlet line 10 between the cyclone filter 9 and the exhauster 3, and is connected via water to the cold water supply line 22 and to the vacuum evaporator 12, respectively. Installing the heat exchanger 23 allows the heat of the moist air leaving the drying unit to be utilized. In this way, economizer 7 receives combustion products that lack toxic gases. Installing a heat exchanger 24 avoids the thermodynamic losses when mixing condensate and feedwater flows. I il. S (O with so with co. 00 4

Description

The invention relates to heat and power engineering and can be used in soiled boiler houses equipped with mezzanine installations.

The purpose of the invention is the new efficiency and quality of hot water supply.

The drawing shows a schematic diagram of the installation.

The installation for utilization of heat of the exhaust gases contains a boiler 1, equipped with a fuel line 2 and connected to the exhaust fan 3 by a flue pipe 4 with a series of heaters 5, surface 6 and contact 7 economizers, a drying device 8 connected to the heater 5 and peak. a young filter 9, connected by the line I) of the air exhaust with the smoke exhauster 3, and the waste line 11 - with the fuel line 2 of the boiler 1, a vacuum evaporator 12, the drainage line 13 of which is also connected to the flush) () water 2 of the boiler 1, and a branch pipe 14 to the condenser 15 connected by the input 16 of the heated side 17 and the condensate line 18 of the heating side 19 to the supply line 20 of the boiler 1, and the contact 7 and surface 6 economizers are connected in series to the hot water supply line 21 connected to the supply line 22 cold water. The plant, besides T01CH), contains a contact 23 and 24 exchange exchanges, and the contact economizer 7 is equipped with a stage 25, which is pre-connected to gases, connected by water to the cold water supply line 22 through a 1-part heat exchanger 24, the gray side 26 of which is 1, 1 In line 18 from condensate water, the contact heat exchanger 23 is included in the outlet 10 line, iyxa between the cyclone filter 9 and the exhauster 3, and is connected via water to the cold water supply line 22 and to the vacuum evaporator 12, respectively. tazhke under 27 blown air heater and 1-cleaning device 28.

The installation works in the following way.

At one of the gases from the boiler 1 through the duct 4, the heater 27 of the blast air, the gas cleaning device 28 (when operating on fuel oil), the air heater 5, in which the air heated to the drying device 8 is heated, pass through.

Next, the care of the first gases is supplied to the surface economizer 6, in which the hot water supply is heated, and is fed to the contact economizer 7, where the water is then heated, which is then fed to the surface economizer 6 for further heating. From the contact economizer 7, the gases are removed by a smoke exhauster 3 .

The air heated in the air preheater 5 is supplied to the drying device 8,

and then into the cyclone filter 9 for 1) h. it is free from mechanical impurities, ynocHMi.ix from the drying device 8. Next, moist air is fed into the contact generator exchanger 23, where its heat is utilized while simultaneously removing toxic gases from the the output is Hoi o of the material in the suction process in the drying device 8. Next, the cooled and cleaned air enters the suction side of the pump 3.

Initial cold water from. Line 22 enters three parallel branches. In the first branch, water is supplied to the surface heat exchanger 24 and then to the water distribution divider of contact economizer 7, which is not included in the course of the gases, and in the second branch to the water distributor of the second economizer in the direction of gases 7. Moreover, to exclude thermodynamic losses, heat logs are lost during mixing two streams of heat carriers of water temperature behind the surface heat exchanger 24 and carrying the second along the gas stage contact economizer 7 are supported by the same selection of the ratio of the surfaces to ontact nozzle steps

 economizer 7.

Heated in contact economizer 7 water from its sump is supplied to surface economizer 6, where in addition

The heater is heated and then supplied to the consumer. If necessary, after the surface; : ioro economizer 6 heated water can be deaerated.

In the third branch, cold water is supplied to the contact heat exchanger 23, where

f. is heated by the warmth of the humid air after the suction device 8, and also purifies the air from toxic | -ases. The heated water is then fed to a vacuum-evaporator 12, where it is partially evaporated.

0 The resulting fuel is supplied to the condenser 15 to heat the feed water supplied to the heated side 17 of the condenser 15 from the feed line 20. The condensate on line 18 enters the surface heat exchanger 24, where it heats

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- initial cold water. The cooled condensate is supplied to the nutrient line 20 to compensate for the loss of feed water, and to ensure the minimum thermodynamic heat loss from the surface of heat exchange between the condenser 15 and the surface heat exchanger 24 are selected such that the temperature of the condensate after the heat exchanger 24 and the temperature in the feed line 20 are the same. Concentrated precipitates from a vacuum evaporator 12 Ud. 1 but the drainage line 13. The sediments are mixed with the particles removed from the cyclone filter 9 via the waste line 11, and fed to the fuel line 2 and further to the boiler 1 for combustion.

The installation in the air path of the contact heat exchanger 23 between the cyclone filter 9 and the exhauster 3 makes it possible to utilize the heat of the moist air leaving the drying unit 8. In this case, the contact economizer 7 receives the products of combustion, in which there are no toxic gases. This ensures the high quality of the water supplied to consumers, and expands the scope of its application. The supply to the vacuum evaporator 12 only of water heated in the contact heat exchanger 23, and not all heated in the contact economizer 7, reduces the surface of the vacuum evaporator 12.

Installing a surface heat exchanger 24 avoids thermodynamic losses when mixing condensate and feedwater in the feed line 20 and thereby increasing the amount of heat supplied to consumers.

Claims (1)

Invention Formula Installation for utilization of heat of flue gases, containing a boiler, equipped with a fuel line and connected to the exhaust fan by a gas duct with series-installed air heater, over the top a contact and an economical device, a cooler device connected respectively to an air heater and a cyclone filter, connected by a withdrawal line air with a smoke exhauster, and a waste line with the boiler fuel line, a vacuum evaporator, the drain line of which is also connected to the boiler fuel line, and a vapor pipe to the condenser connected by the heated side inlet and the heating side condensate drain line to the boiler supply line, and contact and surface economizers connected in series to the hot water supply line communicated with the line 5 for supplying cold water, characterized in that, in order to increase the economy and quality of hot water supply, it additionally contains contact and surface heat exchangers, and the contact economizer is equipped with an additional gas stage connected through water to the cold water supply line said surface heat exchanger, the heating side of which is included in the condensate drain line, the contact heat exchanger being included in the air discharge line between the cyclone filter and the exhauster, and About water is connected respectively to the cold water supply line and to the vacuum evaporator.