Heat exchanger

FIELD: heating.

SUBSTANCE: invention relates to the field of power engineering and is to find application in heat exchanger apparatus of low and high pressure feed heating systems of steam turbines, heat exchanger apparatus of heat supply systems designed to provide for water reheating due to steam condensation on the heat exchange surface tubes. Proposed is a heat exchanger composed of a housing with a nipple for steam inlet and steam condensate outlet, a tubular system, a water distribution chamber with an inlet, a turn and an outlet compartments with heated water inlet and outlet nipples. Before the nipple for heated water inlet into the heat exchanger a device is installed that reduces the flux passage and is connected to the water chamber turn compartment via a duct equipped with a control valve (valve gate).

EFFECT: improvement of the heat exchanger operational cost-efficiency due to provision for heated water recirculation and increase of the rate of its flow through the heat exchange surface tubes; the tube inside contamination intensity reduction and increase of heated water temperature at the heat exchanger inlet and outlet.

1 dwg

 

The invention relates to the field of energy and can be used in heat exchangers of the regenerative systems high and low pressure steam turbines, heat exchangers heating systems designed for heating water by steam condensation on the pipes of heat transfer surface.

Known heater comprising a housing with steam inlet nozzles and the condensate piping system, a water distribution chamber with the nozzle inlet and outlet of the heated water (MO-350-16-7-II. Industry directory "Heat exchangers, steam turbines, CREATEITEMS, 1989, part I, p.52).

The disadvantage of this heater is to limit the possibility of increasing the flow of heated water, and hence the speed in the tubes of heat transfer surface due to the inadmissibility of increase of the hydraulic resistance and the possibility of dangerous erosion fracture of the metal pipe heat exchange surface. These limitations lead to the fact that the water velocity in the pipe is taken from the nominal mode and is below the allowable maximum mode. When you increase the flow of heated water to its initial temperature, as a rule, remains that at constant values of the surface heat transfer and pressure of the heating steam Pref is the CIO to reduce the temperature of the heated water exiting the heat exchanger.

Known heater comprising a housing with steam inlet nozzles and the condensate piping system, a water distribution chamber with the nozzle inlet and outlet of the heated water and the walls, turning the camera with a dividing wall (PSV-200-7-15. The branch directory."Heat exchangers, steam turbines" CREATEITEMS, 1989, part II, p.57).

On the totality of symptoms known this heater is the closest to the claimed and accepted as a prototype.

The disadvantage of the heater, taken as a prototype, is the fact that when you increase the flow of heated water through changes in the number and location of partitions in a water chamber and maintaining the pressure of the heating steam and the initial temperature of water final temperature decreases. To keep the temperature at the outlet of the heater it is necessary to increase the pressure of the heating steam, which is economically disadvantageous.

The inventive solution allows to increase the efficiency of the heat exchanger due to the recirculation of the heated water and increase its speed in the pipes of the heat exchange surface, reducing the degree of contamination of the inner surface of the pipe and increase the temperature of the heated water at the inlet and outlet of the heat exchanger.

Offered the exchanger is ennik, comprising a housing with inlet nozzle steam and the condensate piping system, a water distribution chamber with an inlet, swivel and outlet sections with pipe entrance and exit of the heated water, in which the inlet nozzle of the heated water in the heat exchanger installed narrowing the flow cross section of the device that is connected to the rotary section of a water chamber of a pipeline with a pre-installed control valves (valve).

The invention is illustrated in the drawing, which shows a heat exchanger, a longitudinal section (General view).

The heat exchanger includes a housing 1 with an inlet steam inlet 2 and the outlet nozzle of its condensate 3, the tube system of the first or second turn 4 and the third or fourth stroke 5 heated water inlet 6, turning 7 and output 8 plots the distribution of the water chamber with the inlet nozzle of the heated water 9 and the outlet nozzle of the heated water 10 of the heat exchanger. Before the inlet nozzle of the heated water in the heat exchanger 9 is installed, the device 11 (such as a nozzle), a narrowing for the heated water flow section and increasing in it the value of the speed of the water. According to the law of Bernoulli pressure of water in the device is lower than before and after. The device 11 is connected with the pivoting section 7 of the water chamber by a pipe 12 with a pre-installed valve 13.

The heat exchanger works the AET as follows. The flow of heating steam enters the casing 1 through the pipe 2 pipe heat exchange surface and the first and second turn 4 and the third or fourth stroke 5 is condensed, thereby heating the water. Condensate of the heating steam accumulates in the lower part of the housing and through the pipe 3 is removed from the heat exchanger. The level of condensate in the housing is supported by the regulating valve installed on the pipe connected to the pipe 3. The flow of the heated water is supplied to the heat exchanger through the pipe and through a narrowing device 11 and the nozzle 9 is supplied to the input 6 of the area of the water chamber. Whence it is directed into the pipe and the first and second turn 4, then through the swivel 7 plot the water chamber water flows in the pipes of the third or fourth turn 5, after which the heated water is supplied to the output 8 of the area of the water chamber and through the pipe 10 extends from the heat exchanger. When the movement of the heated water through a narrowing device 11, the pressure of her in it decreases, then the pipe 9, where the water velocity decreases, the pressure of her partially restored (increased, reaching values of water pressure before narrowing device). Due to the hydraulic resistance of the pipe and the first and second turn 4 the pressure in the rotary section 7 of the water chamber is reduced compared to the pressure in the pipe 9. Narrowing the device and reducing the pressure on RevEmu water in it is calculated thus to the pressure in the device was less pressure in the rotary section 7 of the water chamber. Then when opening the valve 13 of the water heated in the pipes of the first and second stroke 4 via the pipeline 12 will be in a narrowing device 11, increasing after mixing the temperature of the water flowing in the inlet 6 a plot of the water chamber and, ultimately, in the pipes of the first and second turn 4. This will increase the temperature of the inlet pipes of the third and fourth passages 5, which will lead to an increase in water temperature at the outlet of the heat exchanger. In order to avoid reducing the flow of heated water through the pipe 10 due to the recirculation of the heated water through the pipeline 12, the discharge at the initial time must be increased. The most economical considering the heat exchanger will operate with increased flow of heated water over rated. When closed, the valve 13 on the pipe 12 increases water flow through the heater at a constant pressure heating steam will reduce the temperature of the water. When sufficient "reserve" water pressure before narrowing device 11 by opening the valve 13 on the pipe 12, which may be connected to the rotary section 7 or to the output section 8 of the water chamber, contamination of the inner surface of the pipe by increasing the velocity of the water can be reduced, and the temperature of the heated water in the course of the heat exchanger can be increased.

The heat exchanger includes a housing with an inlet nozzle steam and the condensate piping system, a water distribution chamber with an inlet, swivel and outlet sections with pipe entrance and exit of the heated water, characterized in that before the inlet nozzle of the heated water in the heat exchanger installed narrowing the flow cross section of the device that is connected to the rotary section of a water chamber of a pipeline with a pre-installed control valves (valve).



 

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