CN1188654C - Constant flow velocity steam-water heat exchanger - Google Patents

Abstract

The present invention relates to a constant flow velocity steam-water heat exchanger which belongs to the field of heat engineering devices. The steam-water heat exchanger is composed of a sealing head, a heat exchanger body and a condensed liquid collector, wherein the sealing head is arranged on the upper end of the heat exchanger body and is provided with a steam inlet and a steam outlet; the condensed liquid collector is arranged on the lower end of the heat exchanger body and is provided with a condensed liquid guide pipe; the heat exchanger body is a cylinder body, and is composed of more than one independent unit; two sets of heat exchange pipes with unequal quantity are arranged in each independent unit; steam flows in different directions in each set of heat exchange pipes, one set of heat exchange pipes downwards flow, and the other set of heat exchange pipes upwards flow. All independent units are connected through pipe plates to form an integral heat exchanger body; heat exchange pipes between two independent units are staggered; the quantity of each set of heat exchange pipes in each independent unit gradually decreases along the flow direction; the outer wall of the first independent unit is provided with a cooling water inlet, and the outer wall of the last independent unit is provided with a cooling water outlet; a connecting opening of a cooling water connecting pipe is formed between two adjacent independent units. The steam-water heat exchanger can fully use heat exchange areas, the heat exchange coefficient can be increased by 30 to 50%, and material consumption can be reduced.

Description

Equal flow steam-water heat exchanger

technical field

The invention relates to thermal equipment, in particular to a class of steam-water heat exchangers.

Background technique

At present, various types of heat exchangers are usually applied to gas or liquid media. When the heat transfer area of the hot and cold sides is close, the hot and cold fluid sides have comparable heat transfer coefficients, and the operation effect of the heat exchanger is better. If the heat transfer coefficient on one side is low, strengthening means should generally be used to reduce the thermal resistance on that side. But for the steam-water heat exchanger, it has its own characteristics. Firstly, the heat transfer intensity of steam condensation is high, but the volume flow rate changes greatly; the flow rate on the cold water side is large, and the flow resistance is obvious; secondly, the accumulation of condensate immerses part of the heat transfer surface, which affects the heat transfer; the strengthened surface increases the resistance of the cold water side, At the same time, due to steam condensation, the heat exchange area in the downstream part is not fully utilized. Therefore, when the traditional heat exchanger is used for heat exchange between steam and water, there are problems such as large volume and poor export of condensate.

Contents of the invention

The purpose of the present invention is to provide a high-efficiency steam-water heat exchanger that can effectively utilize the heat exchange area, increase the heat transfer coefficient, reduce the volume of the heat exchanger, and rapidly export the condensate.

The constant flow velocity steam-water heat exchanger of the present invention is composed of three parts: a head, a heat exchanger body and a condensate collector. The head is arranged on the upper end of the heat exchanger body, and has a steam inlet and outlet; The lower end of the heat exchanger body is equipped with a condensate outlet pipe; the heat exchanger body is a cylinder, which consists of more than one independent unit from top to bottom, and two sets of heat exchange tubes with different numbers of tubes are placed in each independent unit , steam flows in different directions in each group of heat exchange tubes, one group flows downward, and the other group flows upward. The individual units are connected by tube sheets to form an integral heat exchanger body. The heat exchange tubes between two independent units are staggered; the number of tubes in each group of heat exchange tubes decreases along the flow direction. There is a cooling water inlet on the outer wall of the first independent unit, and a cooling water outlet on the outer wall of the last independent unit. There is a cooling water connection pipe interface between two adjacent independent units.

The constant flow velocity steam-water heat exchanger of the present invention adopts the separated multi-layer structure, fully utilizes the heat exchange area, improves the heat exchange coefficient, can reduce the heat exchange area by 30-50%, and reduces material consumption.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the steam-water heat exchanger with equal flow velocity in the present invention.

Detailed ways

Embodiment is described as follows in conjunction with accompanying drawing:

The equal flow rate steam-water heat exchanger of the present invention (Fig. 1) is composed of a head 2, a heat exchanger body 1, and a condensate collector 3; there is a steam inlet 7 and a steam outlet 8 on the head; The separator 6 is used to separate the incoming steam and the outgoing steam. The head 2 is connected to the heat exchanger body 1 by flanges; the heat exchanger body 1 is formed by connecting two independent units through flanges; each independent unit is installed Two groups of heat exchange tube groups 4 with different numbers of tubes, the direction of steam flow of the two groups of tubes is opposite, one group flows from top to bottom, and the other group flows from bottom to top; two independent units are connected by tube sheets 11 , there is a cavity 13 between the tube sheets to flow downward, and the other group flows from bottom to top; two independent units are connected by a tube sheet 11, and there is a cavity 13 between the tube sheets to store condensate and steam , the condensate in the cavity 13 is introduced into the condensate collector 3 by the catheter 5, the condensate collector 3 is connected with the heat exchanger body 1 by a flange, and there is a condensate outlet pipe 12 to discharge the condensate; an independent unit The tubes in the heat exchanger and the tubes in another independent unit are arranged in a staggered manner. The upper end of the heat exchanger body 1 has a cooling water inlet 9, and the lower end has a cooling water outlet 10. Two independent units are connected by a cooling water communication pipe 14.

When the same flow rate steam-water heat exchanger is working, the steam enters from the inlet 7, flows downward through the heat exchange tube group 4, enters the heat exchange tube group of the second independent unit, then enters the condensate collector 3, and then enters another The group of heat exchange tubes flows upwards and is discharged from the steam outlet. The number of tubes in each group of heat exchange tube groups in the independent unit is reduced group by group along the direction of steam flow, so as to achieve equal flow velocity of steam and improve heat exchange efficiency.

Claims (1)

1. A constant flow rate steam-water heat exchanger, which is characterized by three parts: a head, a heat exchanger body, and a condensate collector. The head is placed on the upper end of the heat exchanger body and has a steam inlet and outlet; The condensate collector is placed at the lower end of the heat exchanger body, and is equipped with a condensate outlet pipe; the heat exchanger body is a cylinder, which is composed of more than one independent unit from top to bottom, and the number of two sets of tubes is placed in each independent unit Unequal heat exchange tubes, steam flows in different directions in each group of heat exchange tubes, one group flows downwards, and one group flows upwards, each independent unit is connected by a tube sheet to form a whole heat exchanger body, two The heat exchange tubes between independent units are staggered; the number of heat exchange tubes in each group decreases along the flow direction, the first independent unit has a cooling water inlet on the outer wall, and the last independent unit has a cooling water outlet on the outer wall. There is a cooling water connection pipe interface between the independent units.

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