SK10522002A3 - Capillary tube heat-exchanger with separated condenser - Google Patents

Abstract

It is described a capillary tube heat exchanger with separated condenser, handling a steam water heating at the system of steam turbine recuperation in the classical and nuclear power plants, as well as at systems of the centralised heat distribution. The heat exchanger includes condensing part (1) and reducing part (2) between which a water box (3) is placed. The water box (3) is divided into two halves by vertical compartment (4) with manholes, one half of which is divided by horizontal compartment (5) into bottom side (6) and top-side (7).

Description

Technical field

The invention relates to a hairpin heat exchanger with a separate condenser, which solves the heating of water by superheated steam in a system for the regeneration of steam turbines of conventional and nuclear power plants, as well as in centralized heat supply systems.

BACKGROUND OF THE INVENTION

Previously known hairpin heat exchanger solutions are such that either they do not provide water heating in one installation or, if so, they do not cover all the heating system requirements. In order to economically cool superheated steam (when it is overheated by 50 ° C or more above the saturation temperature at a given pressure), two separate hairpin exchangers, the so-called heat exchangers, are required. derivative solution, where in one of them the condensation of superheat temperature takes place (heat transfer by convection) and in the other the condensation overheated by 20 - 30 ° C. Such a derivative solution of hairpin exchangers is very demanding in terms of material and production, and also has increased space requirements. These disadvantages are partially eliminated by the so-called. an integral hairpin heat exchanger solution having both parts, both condensation and shrinking, in one jacket body, which, in vertical hairpin exchangers, is located above the tubesheet on the heated water outlet side. The integral design of the hairpin heat exchangers with the coolant and subcooling part in one housing body, in addition, does not allow different values of flow rates of heated water in its individual parts, which, however, are frequent and necessary in terms of heat exchange efficiency in heating systems.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hairpin heat exchanger which avoids these disadvantages. The task is solved by a hairpin heat exchanger with a separate condenser, whose essence is that between its condensation part and the condensation part there is a water chamber divided into two halves by a vertical compartment with hatches, one half of which is divided by a horizontal compartment into the upper section and bottom section.

The effect of the solution is qualitatively and quantitatively different from that achieved by the prior art and qualitatively exceeds the level of effect achieved by the prior art solution to this technical problem. The advantages of such a hairpin heat exchanger according to the invention are that the space, material and manufacturing requirements are reduced compared to the prior art derivative solution with two separate hairpin heat exchangers. at the same time

The hairpin heat exchanger according to the invention also allows different values of flow rates of heated water in its individual parts, which is not possible in the present integral solutions of these devices. The condensation part and the precipitation part need not have the same jacket diameter. The diameter of the shroud jacket may be smaller than the condenser jacket diameter, depending on the flow of heated water flowing through these portions, allowing the heat transfer through convection to be increased, thereby reducing the heat exchange area of the precipitation portion. It follows that the hairpin heat exchanger solution according to the invention eliminates the disadvantages of the derivative and integral hairpin heat exchanger solution and allows their common advantages to be exploited.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail by means of the accompanying drawings of a hairpin exchanger with a separate precipitator, of which FIG. 1 shows an arrangement of its individual parts, and FIG. 2 shows the flow of heated water and heating steam through a hairpin heat exchanger according to the invention.

DETAILED DESCRIPTION OF THE INVENTION.

The hairpin exchanger of FIG. 1 consists of a condensation part 1, a precipitation part 2 and a water chamber 3. The condensation part I is formed by an upper jacket 8, an upper U-beam 9, an upper impact plate 10, an upper inlet throat of heater steam 11, an outlet throat of heater steam 12 and The chamfer part 2 is formed by a lower casing 15, a lower U-tube bundle 16, a lower inlet throat of the heating steam 17, an outlet throat of the heating steam 18, a lower impact plate 19 and a lower tube sheet 20. The water chamber 3 is formed by an intermediate jacket 24. a vertical compartment with hatches 4, a horizontal compartment 5, an upper section 6, a heated water inlet 21, a heated bypass outlet 22, a lower section 7, a heated water outlet 23 and a hatch 14.

The flow of heated water and heating steam through the hairpin heat exchanger according to the invention is apparent from FIG. 2, wherein the heated water flows through the heated water inlet 21 into the upper section 6 of the water chamber 3, from which it enters the upper U-tube bundle 9 of the condensation part 1, from where the heated water flows to the other half of the water chamber 3 and from there enters the lower U From this flow into the lower section 7 of the water chamber 3, the hairpin exchanger exits the outlet of the heated water 23. The vertical compartment with hatches 4 with a by-pass opening in the upper section 6 allows the condensation part 1 to be bypassed. a bypass opening in the lower section 7 bypassing the precipitation portion 2, the bypass of which is also possible by the bypass outlet of the heated water 22. On the heated water side, it is also possible

3 bypass of condensation part 1 and thus of the precipitation part 2 through the by-pass opening in the horizontal compartment 5. These cases of heated water by-pass are shown in FIG. 2 marked with a dashed line. The heating vapor flows through the lower inlet throat of the steam 17 into the precipitating portion 2 where it flows around the lower U-tube bundle 16 and from there through the outlet throat of the steam 18 and flows through the upper inlet throat of the steam 11 into the condensation portion 1 where it condenses on the upper U-tube. 9. The heater steam condensate leaves the hairpin exchanger through the heater steam condensate outlet 12.

Industrial Applicability

The invention can be used in any water heating or water heating system in addition to the steam turbine regeneration systems of conventional and nuclear power plants and in centralized heat supply systems. other medium by means of superheated steam, where it is necessary to use its superheat and condensation heat.

Claims (4)

P ATENTION Claims A hairpin heat exchanger with a separate precipitator, characterized in that a water chamber (3), divided into two halves by a vertical compartment with hatches (4), one half of which is located between its condensation part (1) and the precipitation part (2) is divided by a horizontal partition (5) into an upper section (6) and a lower section (7). 2. Hairpin heat exchanger according to claim 1, characterized in that the vertical compartment with hatches (4) can have either a by-pass opening in the upper section (6) of the water chamber (3) or a by-pass opening in the lower section (7). the water chamber (3), or at the same time the bypass in the upper section (6) and the lower section (7) of the water chamber (3). 3. Hairpin heat exchanger according to claim 1, characterized in that the horizontal compartment (5) of the water chamber (3) can have a by-pass opening. Hairpin heat exchanger according to Claims 1 to 3, characterized in that the upper jacket (8) of the condensation part (1) and the lower jacket (15) of the precipitation part (2) need not have the same diameter.