SU1695075A1 - Method of exhaust gases waste heat recovery - Google Patents

Abstract

The invention relates to heatmertika and m. used to recover the heat of flue gases from industrial enterprises. The purpose of the invention is to increase the efficiency of utilization of the heat of flue gases and the degree of heating of the object. For this, a mixture of high boiling and low boiling components is used as an intermediate coolant. In this case, the coolant is cooled in two stages, in the first of which the low-temperature flow is separated from the gas mixture components, followed by expansion of the low-boiling component, lowering its temperature and feeding the intermediate heat-carrier circuit, and in the second stage the high-boiling component is evaporated, they increase the pressure and eject the incoming gas to them, dividing the flow into hot and cold. At the same time, the cold stream is directed to cool the coolant, and the temperature of the hot stream is increased by successive passage of the energy separation circuit and is supplied for use in the object. 1 il. k / r

Description

The invention relates to a power system and can be used to recover the heat of flue gases from industrial plants.

The purpose of the invention is to increase the efficiency of utilization of the heat of flue gases and the degree of heating of the object.

The drawing shows an installation diagram for implementing a method for utilizing heat of flue gases.

The installation contains a heating object 1, which is at the same time a source of flue gases, a fan 2, a utilization heat exchanger 3, a collector 4 of an intermediate heat carrier, a pump 5,

heat exchanger-evaporator 6, heat exchanger 7 intermediate cooling of heat-transfer agent, eke-op 8, throttle valve 9, compressor 10, vortex combined pipes 11 with connected peripheral zones, washer 12, ring nozzle 13 and connecting pipelines.

The installation works as follows.

The flue gases from object 1, for example, a furnace, are fed through a fan 2 through a heat recovery heat exchanger 3, into which a high-temperature intermediate heat carrier consisting of high boiling and low boiling com-

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The gases transfer heat to the intermediate coolant, are partially cooled and ejected by means of 10 vaporized coolants compressed in the compressor into the warm-air zones of the vortex combined pipes 11. As a result of the energy separation, the pipes 11 form a cold I-stream with a temperature of about 150 ° C and a hot Flow with a temperature of 450 ° C, which is supplied due to vacuum in object 1, is mixed there with combustion products and utilized, for example, when baking baked goods. The escaping gases from object 1 are re-directed to the circuit. In the intercooling heat exchanger 7, the cold flow after the pipes 11 is cooled by a stream of low-boiling component to the required temperature (120–150 ° C), while the gases are separated from the coolant and released into the atheosphere, and the coolant enters the heat exchanger-evaporator 6, in which the high-boiling component boils, the coolant flow, consisting mainly of low-boiling component, is cooled, before it is fed to the throttle valve. 9. The passage, the coolant, due to the Joule-Thomson effect is cooled and accumulated TC in collector 4, from which it is pumped by pump 5 to utilization heat exchange- 3 for cooling gases before their ejection into the suds zones of the vortex pipes 11.

Claims (1)

Invention Formula Method for utilization of heat of flue gases by supplying the latter from the combustion zone to the flow of intermediate heat carrier circulating in the circuit with its subsequent cooling in the heating object, characterized in that, in order to increase the heat recovery efficiency of flue gases and the heating rate of the object, as an intermediate heat carrier a mixture of high boiling and low boiling components is used, and the flue gases are supplied to the intermediate heat carrier by ejecting them with peers formed during evaporation of the the high-boiling component condensate of the intermediate heat carrier, which is pre-cooled in two stages; in the first stage, it is cooled with a cold stream, which is formed by energy separation into hot and cold flows of the mixture obtained after ejection, and in the second stage, the coolant is cooled by expansion of the low-boiling component and then directed to the cooling of the gases prior to their injection. wherein the hot stream obtained after the energy separation is directed to the heating object, and the cold stream is additionally cooled before it is fed to the first cooling stage and freed from gases.