Heat exchange equipment combining flash separation tank and double heat exchangers

Abstract

The utility model relates to the field of flash pressure reduction and plate type heat exchangers, in particular to a flash separation tank and double heat exchanger combined heat exchange device which comprises a flash separation tank, a steam plate type heat exchanger and a hot water plate type heat exchanger which are fixed on a base. The steam plate heat exchanger is arranged on the upper portion of the hot water plate heat exchanger, and the flash separation tank is arranged on the side faces of the steam plate heat exchanger and the hot water plate heat exchanger and used for separating steam and liquid of a steam-water mixture in a primary high-pressure water supply pipeline into steam and hot water. The separated steam is subjected to heat exchange work through a steam plate heat exchanger; the separated hot water is subjected to heat exchange work through a hot water plate heat exchanger; the heat exchange equipment can adapt to the working condition that the primary side is a high-pressure medium, and the limitation of a traditional plate heat exchanger in high-pressure application is solved; according to the arrangement mode, the structure is compact, and space is saved; each pipeline is short in stroke and convenient to operate and manage; the device is especially suitable for an environment with limited space.

Description

Technical Field

[0001] The utility model relates to the field of flash evaporation pressure reduction and plate heat exchangers, in particular to heat exchange equipment combining a flash evaporation separation tank with a double heat exchanger. Background Art

[0002] Plate heat exchangers are widely used in the HVAC industry due to their compact structure, high heat exchange efficiency, and small footprint. However, traditional plate heat exchangers are mostly detachable "plate-gasket-plate" structures, and their design pressure is often limited by the use pressure of the gasket, making them difficult to use in conditions where the primary side is a high-pressure medium. On the other hand, traditional high-pressure heat exchangers are bulky and occupy a large area, making them unsuitable for use in sites with limited installation space.

[0003] Therefore, it has become an urgent problem to study a combined heat exchange equipment that has the advantages of plate heat exchangers and is suitable for high-pressure conditions. Utility Model Content

[0004] The utility model aims to provide a flash evaporation and pressure reduction double heat exchanger combined heat exchange equipment to solve the problem that the detachable plate heat exchanger in the prior art cannot be used when the primary side is in a high pressure condition.

[0005] To achieve the above object, the utility model provides the following technical solution: a heat exchange device combining a flash separation tank and a double heat exchanger, comprising a flash separation tank fixed on a base, a steam plate heat exchanger and a hot water plate heat exchanger;

[0006] The steam plate heat exchanger is arranged on the upper part of the hot water plate heat exchanger, and the flash separation tank is arranged on the sides of the steam plate heat exchanger and the hot water plate heat exchanger;

[0007] The flash separation tank is provided with a water supply inlet, a steam outlet, and a hot water outlet; the water supply inlet of the flash separation tank is connected to a primary high-pressure water supply pipeline; a first pressure reducing valve is provided on the primary high-pressure water supply pipeline;

[0008] The steam outlet of the flash separation tank is connected to the steam plate heat exchanger through a steam pipeline; the hot water outlet of the flash separation tank is connected to a hot water pipeline;

[0009] The condensate outlet of the steam plate heat exchanger is connected to the condensate pipeline;

[0010] The hot water pipeline and the condensed water pipeline are connected to the hot water plate heat exchanger after merging at the condensed water inlet interface;

[0011] The cold side inlet of the hot water plate heat exchanger is connected to the secondary water supply pipeline; the cold side outlet of the hot water plate heat exchanger is connected to the cold side inlet of the steam plate heat exchanger through the plate exchange connecting pipeline;

[0012] The cold side outlet of the steam plate heat exchanger is connected to the secondary water return pipeline.

[0013] Furthermore, the flash separation tank is provided with a liquid level gauge, a first pressure gauge and a thermometer; the lower end of the flash separation tank is also provided with a sewage outlet, and the lower end of the sewage outlet is provided with a first stop valve.

[0014] Furthermore, a second stop valve, a third pressure gauge and a check valve are sequentially provided along the water flow direction of the condensate pipeline.

[0015] Furthermore, a filter, an electric regulating valve, a second pressure gauge, a second pressure reducing valve and a condensed water inlet interface are sequentially provided on the hot water pipeline along the water flow direction.

[0016] Beneficial Effects

[0017] The heat exchange equipment of the utility model can adapt to the working condition of high-pressure medium on the primary side, solving the limitation of traditional plate heat exchangers in high-pressure applications;

[0018] The steam plate heat exchanger of the utility model is arranged on the upper part of the hot water plate heat exchanger, and the flash separation tank is arranged on the sides of the two. This arrangement is compact and space-saving; each pipeline has a short stroke, which is convenient for operation and management; it is particularly suitable for environments with limited space, such as ships, buildings and small factories. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the connection distribution structure of the heat exchange equipment disclosed in the utility model;

[0021] Figure 2 It is a schematic diagram of the external structure of the heat exchange device disclosed by the utility model.

[0022] In the figure:

[0023] 1. Flash separation tank; 2. Steam plate heat exchanger; 3. Hot water plate heat exchanger; 11. First pressure reducing valve; 12. First stop valve; 13. Filter; 14. Electric regulating valve; 15. Second pressure reducing valve; 16. Second stop valve; 17. Check valve; 21. Liquid level gauge; 22. First pressure gauge; 23. Thermometer; 24. Second pressure gauge; 25. Third pressure gauge. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a heat exchange device combining a flash separation tank and a double heat exchanger, comprising: a flash separation tank 1 fixed on a base, a steam plate heat exchanger 2, a hot water plate heat exchanger 3, a primary high-pressure water supply pipeline, a steam pipeline, a hot water pipeline, a condensate pipeline, a secondary water supply pipeline, a plate heat exchanger connecting pipeline, a secondary return water pipeline and a primary return water pipeline.

[0026] The steam plate heat exchanger 2 is arranged on the upper part of the hot water plate heat exchanger 3, and the flash separation tank 1 is arranged on the sides of the two. This arrangement has a compact structure, short strokes of each pipeline, and is easy to operate and manage. The heat exchange equipment of the utility model is suitable for the HVAC industry that requires high efficiency and compact structure, especially in environments with limited space, such as ships, buildings and small factories.

[0027] The flash separation tank 1 is used to separate the vapor and liquid of the steam-water mixture in the primary high-pressure water supply pipeline into steam and hot water; the separated steam is subjected to heat exchange through the steam plate heat exchanger 2; the separated hot water is subjected to heat exchange through the hot water plate heat exchanger 3; it should be noted that the separated steam will be cooled down and condensed into hot water after passing through the steam plate heat exchanger 2 for heat exchange, and the hot water will be merged with the water flow in the hot water pipeline after passing through the condensate inlet interface and circulated to the hot water plate heat exchanger to continue heat exchange, which can further improve the thermal conversion efficiency of the steam.

[0028] One end of the primary high-pressure water supply pipeline is connected to the primary high-pressure water supply end A, and the other end is connected to the water supply inlet of the flash separation tank 1, and a first pressure reducing valve 11 is provided on the primary high-pressure water supply pipeline; the first pressure reducing valve 11 is used to adjust the pressure of the steam-water mixture entering the flash separation tank 1;

[0029] The flash separation tank 1 is used for gas-liquid separation of the gas-water mixture and is provided with a water supply inlet, a steam outlet, and a hot water outlet;

[0030] One end of the steam pipeline is connected to the steam outlet, and the other end is connected to the hot side inlet of the steam plate heat exchanger 2; one end of the hot water pipeline is connected to the flash hot water outlet, and the other end is connected to the hot side inlet of the hot water plate heat exchanger 3;

[0031] One end of the condensate pipe is connected to the condensate outlet of the steam plate heat exchanger 2, and the other end is connected to the condensate inlet interface on the hot water pipe;

[0032] One end of the secondary water supply pipeline is connected to the secondary water supply end C, and the other end is connected to the cold side inlet of the hot water plate heat exchanger 3;

[0033] One end of the plate heat exchanger connecting pipe is connected to the cold side outlet of the hot water plate heat exchanger 3, and the other end is connected to the cold side inlet of the steam plate heat exchanger 2;

[0034] One end of the secondary water return pipeline is connected to the cold side outlet of the steam plate heat exchanger 2, and the other end is connected to the secondary water return end B;

[0035] One end of the primary return water pipeline is connected to the hot side outlet of the hot water plate heat exchanger 3, and the other end is connected to the primary return water end D.

[0036] Furthermore, a liquid level gauge 21, a first pressure gauge 22 and a thermometer 23 are provided on the flash separation tank 1; the liquid level gauge 21, the first pressure gauge 22 and the thermometer 23 can be used to monitor the internal state of the flash separation tank 1 to ensure the stable operation of the heat exchange equipment; a sewage outlet is also provided at the lower end of the flash separation tank 1, and a first stop valve 12 is provided at the lower end of the sewage outlet for sewage discharge.

[0037] Furthermore, the condensate pipeline is provided with a second stop valve 16, a third pressure gauge 25 and a check valve 17 in sequence along the water flow direction. The second stop valve 16 and the third check valve 17 are used to control the flow direction of the condensate pipeline; the third pressure gauge 25 is used to measure the internal pressure of the condensate pipeline.

[0038] Furthermore, a filter 13, an electric regulating valve 14, a second pressure gauge 24, a second pressure reducing valve 15 and a condensate inlet interface are sequentially provided on the hot water pipeline along the water flow direction, wherein the filter 13 can filter most of the impurities in the water to avoid pipeline blockage; the electric regulating valve 14 can control the flow of the hot water pipeline and thus control the liquid level in the flash separation tank 1 to ensure a good separation effect; the second pressure reducing valve 15 is adjusted according to the pressure parameters measured by the second pressure gauge 24 and the third pressure gauge 25, in order to fully mix the condensate after heat exchange in the steam heat exchanger with the hot water in the hot water pipeline.

[0039] The working principle and process are as follows:

[0040] The primary side high-pressure water supply enters the primary high-pressure water supply pipeline from the A end, and is decompressed by the first pressure reducing valve 11 arranged on the pipeline. The decompressed steam-water mixture enters the flash separation tank 1 through the primary high-pressure water supply pipeline. The steam-water mixture is separated into steam and liquid in the flash separation tank 1. The separated steam enters the steam pipeline through the steam outlet, and then enters the steam plate heat exchanger 2 for heat exchange. The condensed water after heat exchange enters the condensed water pipeline, passes through the second stop valve 16, the third pressure gauge 25 and the third check valve 17 in sequence, and enters the hot water pipeline through the condensed water inlet interface.

[0041] The hot water separated by the flash separation tank 1 enters the hot water pipeline from the hot water outlet, and passes through the filter 13, the electric regulating valve 14, the second pressure gauge 24 and the second pressure reducing valve 15 in sequence, wherein the filter 13 can filter most of the impurities in the hot water to avoid blockage of the plate heat exchanger; the electric regulating valve 14 can control the liquid level in the flash separation tank 1; the second pressure reducing valve 15 is adjusted according to the pressure parameters measured by the second pressure gauge 24 and the third pressure gauge 25, in order to fully mix the condensed water after heat exchange in the steam heat exchanger with the hot water in the hot water pipeline.

[0042] The mixed hot water enters the hot water plate heat exchanger 3 for heat exchange, and after heat exchange, is connected to the primary return water end D through the primary return water pipeline.

[0043] The secondary return water enters the hot water plate heat exchanger 3 from the C end through the secondary return water pipeline for heat exchange. After heat exchange, it enters the steam plate heat exchanger 2 through the plate exchange connecting pipeline for heat exchange. Finally, the water after heat exchange enters the secondary return water end B through the secondary water supply pipeline.

[0044] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A heat exchange device combining a flash separation tank and a double heat exchanger, characterized in that: It comprises a flash separation tank (1), a steam plate heat exchanger (2) and a hot water plate heat exchanger (3) fixed on a base; The steam plate heat exchanger (2) is arranged on the upper part of the hot water plate heat exchanger (3), and the flash separation tank (1) is arranged on the sides of the steam plate heat exchanger (2) and the hot water plate heat exchanger (3); The flash separation tank (1) is provided with a water supply inlet, a steam outlet, and a hot water outlet; the water supply inlet of the flash separation tank (1) is connected to a primary high-pressure water supply pipeline; a first pressure reducing valve (11) is provided on the primary high-pressure water supply pipeline; The steam outlet of the flash separation tank (1) is connected to the steam plate heat exchanger (2) via a steam pipeline; the hot water outlet of the flash separation tank (1) is connected to the hot water pipeline; The condensate outlet of the steam plate heat exchanger (2) is connected to the condensate pipeline; The hot water pipeline and the condensed water pipeline are connected to the hot water plate heat exchanger (3) after merging at the condensed water inlet interface; The cold side inlet of the hot water plate heat exchanger (3) is connected to the secondary water supply pipeline; the cold side outlet of the hot water plate heat exchanger (3) is connected to the cold side inlet of the steam plate heat exchanger (2) through a plate exchange connecting pipeline; The cold side outlet of the steam plate heat exchanger (2) is connected to the secondary water return pipeline.

2. The heat exchange equipment combining a flash separation tank and a double heat exchanger according to claim 1, characterized in that: The flash separation tank (1) is provided with a liquid level meter (21), a first pressure gauge (22) and a thermometer (23); the lower end of the flash separation tank (1) is also provided with a sewage outlet, and the lower end of the sewage outlet is provided with a first stop valve (12).

3. The heat exchange equipment combining a flash separation tank and a double heat exchanger according to claim 1, characterized in that: A second stop valve (16), a third pressure gauge (25) and a check valve (17) are sequentially provided on the condensate water pipeline along the water flow direction.

4. The heat exchange equipment combining a flash separation tank and a double heat exchanger according to claim 1, characterized in that: A filter (13), an electric regulating valve (14), a second pressure gauge (24), a second pressure reducing valve (15) and a condensed water inlet interface are sequentially arranged along the water flow direction on the hot water pipeline.

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