SU1672107A1 - Power generating unit - Google Patents

Abstract

This invention relates to heat recovery and can be used in metallurgy. Its purpose is to stabilize the parameters of the generated steam. Flue gases (H) from the furnace (P) 1 are fed to stage (C) 11 of the heat exchanger, where they are cooled with air (C), and then sent to the waste-heat boiler (KU) 3. Before KU, 3 G P 1 is mixed with G chamber combustion of additional fuel directed to the chimney 2 from sections 9 of the combustion chamber towards H P 1, which promotes intensive mixing of both flows G. After KU 3 G it is sent to C 12 where it is cooled B fed to the burners of sections 9. To eliminate oscillations T according to the temperature before KU 3, sensor 21 regulates the recirculation B at the intake of the fan 17 burners 6 P 1. 2 h. . f-ly. 1 il.

Description

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This invention relates to the utilization of heat from gases from fuel-burning installations and can be used in metallurgy.

The purpose of the invention is to increase the efficiency of operation by stabilizing the parameters of the produced steam.

The drawing shows a diagram of the energy technology unit.

The unit contains a stove 1 with a discharge chimney 2 in which a waste heat boiler 3 with an additional fuel combustion chamber and a heat exchanger connected with hot air pipes 4 and 5 to the burners 6 of the furnace 1 and the burners 7 of the combustion chamber are placed. The unit also contains perforated air collectors 8. The combustion chamber is made in the form of several sections 9. located around

chimney 2 and its connected flue gas ducts 10 connected to it, said air manifolds 8 are connected to sections 9 with their longitudinal axes perpendicular to the longitudinal axis of their flue gas ducts 10. And the heat exchanger is made of two successive stages of gases 11 and 12, moreover, the first burners of stage 11 are connected to the burners 6 of the furnace 1, and the second chamber of the burners 7 are connected to the burners 7. The first step 11 and the second step 12 of the recuperator are each equipped with their own recirculation circuits 13 and 14 with regulating valves s 15 and 16 and the fans 17 and 18.

In the chimney 2 between the waste-heat boiler 3 and the step 12 of the heat exchanger, a smoke exhauster 19 is placed. The steam discharge line 20 of the heat-recovery boiler 3 is equipped with a sensor 21

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In the chimney 2 after the combustion chamber there is a sensor 22 of the parameters of the flue gases, and in the pipe 5 to the burners 7 - a control valve 23.

The operation of the unit is as follows.

Flue gases with a temperature of 850-700 ° C from the furnace 1 enter the recuperator stage 11, where they are cooled with air, and with a temperature of 500-400 CB are sent to the waste-heat boiler 3. Before the heat-recovery boiler 3, the flue gases of the furnace are mixed with the flue gases of the combustion chamber supplied through the ducts 10 of its sections 9 and directed towards the flow of flue gases of the furnace 1, which contributes to a more intense and uniform mixing.

After the waste-heat boiler 3, the flue gases are directed through the exhauster 19 to the heat exchanger stage 12, where they are cooled with air to a temperature of 120–70 ° C and are then discharged into the chimney.

Atmospheric air by the fan 18 is directed to step 12, is heated and then enters the burner 7 of the gas combustion section 9. A portion of the heated air, the m-r / burner-7, is directed through the control valve 23 to the collectors 8 and through the sensor 22 for maintaining the temperature of the flue gases ia-yu in front of the waste-heat boiler 3 is mixed with the flue gases leaving through the ducts 10 of the sections 9.

With a change in the flow rate of the toimiv and in accordance with the flow rate of the air flow rate for furnaces 1 dg. eliminating fluctuations in the temperature of the house gases in front of the waste-heat boiler 3 via the sensor 21 supporting steam of steam of steam at the outlet by means of the regulating valve 15 ensures recirculation of hot air to the inlet of the fan 17. When the gas flow rate changes at section 9 and the pulse maintains

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air temperature at the inlet of the fan 18 through the valve 16 provides for recirculation of hot air at the intake of the fan 18.

A change in the vacuum or pressure of the flue gases in sections 9 due to the constant cross section of the flue gas ducts 10 at a variable flow of flue gases allows sections 9 to be calculated for reduced flow rates of gases at which a depression occurs in sections 9.

Claims (3)

1.Energy-processing unit containing a furnace with an exhaust chimney, in which a waste heat boiler with an additional fuel combustion chamber is placed, and a heat exchanger connected by hot air pipelines to the burners of the furnace and the combustion chamber, in order to increase efficiency by stabilizing parameters of the steam being produced, it additionally contains perforated air collectors the combustion chamber is made in the form of several sections located around the chimney and connected to it with its own exhaust ducts, men- tioned Tbit, air collectors are connected to sections of the combustion chamber with their longitudinal axes perpendicular to the longitudinal axis of the exhaust ducts of the sections, and the heat exchanger is made of two successive steps with gases, and the first burner is connected to the burners of the furnace, and to the burners of the combustion chamber - the second. 2. An apparatus according to claim 1, characterized in that the first in terms of gases, the heat exchanger stage is provided with an air recirculation loop. 3. The unit according to claim 1, characterized in that the second gas stage of the heat exchanger is equipped with an air recirculation circuit, .20