Novel built-in plate heat exchanger

Abstract

The utility model discloses a novel built-in plate heat exchanger which comprises an outer shell, the top of the outer shell is connected with a thermal medium inlet connecting pipe, a welded plate heat exchanger is arranged in the outer shell, the lower portion of the side face of the welded plate heat exchanger is connected with a cold medium inlet connecting pipe, and the upper portion of the side face of the welded plate heat exchanger is connected with a cold medium outlet connecting pipe. The bottom of the center of the welding type plate heat exchanger is connected with a pipe box, the side face of the pipe box is connected with an uncondensed medium outlet connecting pipe penetrating through the side wall of the outer shell, a flange type differential pressure liquid level meter inserted into the pipe box is arranged below the uncondensed medium outlet connecting pipe, and the bottom of the pipe box is connected with a condensate outlet through an elbow. The plate type heat exchanger is used for designing gas-liquid and gas-gas medium heat exchange occasions with high pressure and large tube shell side pressure difference, and the problems that a traditional plate type heat exchanger is high in manufacturing cost and low in safety coefficient when used for high-pressure medium heat exchange are solved; and the problems of personal injury and environmental pollution caused by leakage of toxic and harmful media are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a novel built-in plate heat exchanger. Background Art

[0002] Plate heat exchanger is a commonly used heat exchange equipment, widely used in chemical, heating, petroleum, food and other industries. The medium of conventional welded plate heat exchanger flows into the shell through the pipe and then enters the heat exchanger for heat exchange. For gas-liquid and gas-gas heat exchangers with high design pressure and large design pressure difference, welded plate heat exchangers cannot be used. Shell and tube heat exchangers are usually used, but the heat transfer efficiency of shell and tube heat exchangers is only 1 / 5 to 1 / 3 of that of plate heat exchangers. It cannot produce turbulence at a lower Reynolds number, the heat exchanger area is large, and the cost is high; moreover, usually only welding seals are used to avoid leakage of toxic and harmful media, but equipment leakage is inevitable due to manufacturing defects, equipment vibration, etc., especially gas media is more prone to leakage and has poor safety; and for partial condensation of gas, the conventional heat exchanger structure will discharge the gas-liquid mixture together, resulting in gas waste, system instability, and difficulty in condensate recovery.

[0003] Therefore, the utility model creatively proposes a new plate heat exchanger structure, which can be used in gas-liquid and gas-gas medium heat exchange occasions with high design pressure and large shell and tube side pressure difference, which not only solves the problems of high manufacturing cost and low safety factor of traditional plate heat exchangers when used for high-pressure medium heat exchange; it also solves the problems of medium splashing and harming the body and polluting the environment once leakage occurs during heat exchange of toxic and harmful media, as well as violent reaction with air and explosion; at the same time, the non-condensable gas after cooling is promptly recovered for secondary utilization to avoid waste and environmental pollution. Utility Model Content

[0004] The purpose of the utility model is to provide a novel built-in plate heat exchanger to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A novel built-in plate heat exchanger comprises an outer shell, the top of which is connected to a heat medium inlet pipe, and both sides of which are provided with lifting ears; a welded plate heat exchanger is arranged inside the outer shell, the lower side of the welded plate heat exchanger is connected to a cold medium inlet pipe penetrating the side wall of the outer shell, and the upper side is connected to a cold medium outlet pipe penetrating the side wall of the outer shell, the central bottom of the welded plate heat exchanger is connected to a pipe box, the side of the pipe box is connected to an uncondensed medium outlet pipe penetrating the side wall of the outer shell, a flange-type differential pressure level gauge inserted into the pipe box is arranged below the uncondensed medium outlet pipe, and the bottom of the pipe box is connected to a condensate outlet through an elbow; an equipment base is arranged at the bottom of the outer shell, and a blind plate for an inspection port is arranged at the center of the equipment base.

[0007] Preferably, an electric valve is provided on the condensate outlet.

[0008] The working process of the utility model is:

[0009] The hot side gas enters the shell from the upper pipe port, filling the entire shell outside the heat exchanger, and then relies on the gas's own pressure to allow it to enter the heat exchanger for heat exchange. After condensation, the liquid flows out from the lower interface. If there is still gas at the outlet, the gas is discharged from the upper interface of the liquid storage tank. When there is a two-phase fluid of gas and liquid at the outlet, the liquid level of the liquid storage tank must be controlled by the linkage of the electric valve and the liquid level gauge to reach a certain height before discharging, so as to achieve gas-liquid separation, rather than allowing part of the gas to be discharged with the liquid; the cold side medium (gas or liquid) enters and exits from the outside of the shell, and the heat exchange of the hot and cold side media is achieved through the partition wall. The linkage of the electric valve and the liquid level gauge: through the PLC control system, set the liquid level height value. When the liquid level reaches a certain height, the information is fed back, and a command is sent to open the electric valve on the condensate outlet pipe to drain the liquid in linkage. When the gas pressure on the hot side is higher than the medium pressure on the cold side: let the medium on the hot side enter the shell from top to bottom and leave the shell. After the entire shell is filled with gas, the pressure is balanced, and the equipment has good stability. There are many contacts between the heat exchanger plates. After the high-pressure medium gives a certain pressure, the plate contacts are more fully in contact, and the heat transfer effect will be better. The plate contact structure has a strong pressure-bearing capacity and can withstand the high pressure of the shell. When conventional products do not have a shell, when the high-pressure medium enters the heat exchanger, it will cause the equipment to swell and deform, reduce safety, and even become unusable. This consequence is also difficult to avoid. When the medium is toxic and harmful: let it directly enter the heat exchanger, so that when a leak occurs, it is protected by the shell to avoid splashing and hurting the body, polluting the environment, and violent reactions with air to cause explosions. The shell is equipped with lifting ears for special use and maintenance; a manhole is set at the base for later cleaning and maintenance.

[0010] The beneficial effects of the utility model are:

[0011] (1) When the utility model is working, the shell side heat medium fills the space between the welded plate heat exchanger and the outer shell, and further exchanges heat with the welded plate heat exchanger under the pressure; the outer shell structure arranged outside the welded plate heat exchanger can meet the working condition that the pressure of the hot side medium is higher than that of the cold side medium, and the outer shell structure is evenly stressed to avoid stress concentration; effective protection is formed on the outside of the welded plate heat exchanger to prevent leakage of toxic and harmful media. At the same time, this structure can reduce the manufacturing cost of high-pressure heat exchange equipment and improve the safety and service life of the equipment.

[0012] (2) The utility model realizes gas-liquid separation of the gas-liquid mixed medium in the pipe box by means of a pipe box arranged at the bottom of the welded plate heat exchanger and a flange-type differential pressure level gauge and an electric valve on the pipe box, thereby effectively separating and recovering the non-condensable gas in the gas-liquid mixed medium.

[0013] (3) An inspection hole is provided at the center of the equipment base at the bottom of the outer shell of the utility model to facilitate cleaning and maintenance of the equipment.

[0014] (4) When the medium in the shell and tube side of the utility model performs heat exchange, the high-pressure medium presses the different plates of the welded plate heat exchanger tightly by pressure, so that the contact points of the plates are in full contact, further improving the heat transfer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a partial cross-sectional view of a pair of plate cross sections of a welded plate heat exchanger in the utility model;

[0017] Among them: 1-hot medium inlet pipe, 2-outer shell, 3-welded plate heat exchanger, 4-cold medium outlet pipe, 5-cold medium inlet pipe, 6-pipe box, 7-electric valve, 8-condensate outlet, 9-equipment base, 10-inspection port blind plate, 11-flange type differential pressure level gauge, 12-uncondensed medium outlet pipe, 13-lifting ear. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1A novel built-in plate heat exchanger shown in the figure comprises an outer shell 2, a heat medium inlet pipe 1 is connected to the top of the outer shell 2, an equipment base 9 is arranged at the bottom, and a blind plate 10 for inspection is arranged at the center of the equipment base 9; lifting ears 13 are arranged on both sides of the heat medium inlet pipe 1; a welded plate heat exchanger 3 is arranged inside the outer shell 2, a cold medium inlet pipe 5 penetrating the side wall of the outer shell 2 is connected to the lower side of the welded plate heat exchanger 3, and a cold medium outlet pipe 4 penetrating the side wall of the outer shell 2 is connected to the upper part; a pipe box 6 is connected to the central bottom of the welded plate heat exchanger 3, and an uncondensed medium outlet pipe 12 penetrating the side wall of the outer shell 2 is connected to the side of the pipe box 6, a flange-type differential pressure level gauge 11 inserted into the inner part of the pipe box 6 is arranged below the uncondensed medium outlet pipe 12, and a condensate outlet 8 is connected to the bottom of the pipe box 6 through an elbow, and an electric valve 7 is arranged on the condensate outlet 8.

[0020] The working process of the utility model is:

[0021] The hot side gas enters the outer shell 2 from the N1 pipe port through the heat medium inlet pipe 1 and fills the entire shell. After the entire shell is filled with gas, the pressure is balanced. After filling the shell, it enters the welded plate heat exchanger 3 due to the pressure to exchange heat. According to the different condensation, there are three cases: the first is that the gas is completely non-condensed, the electric valve 7 is kept closed, and the gas is allowed to flow out from the N3 pipe port through the uncondensed medium outlet pipe 12; the second is that the gas is partially condensed, and the electric valve 7 is kept closed at the beginning, and the gas flows out from the N3 pipe port through the uncondensed medium outlet pipe 12, and the condensate is collected in the pipe box 6. The height of the condensate in the pipe box 6 is recorded by the flange type differential pressure level gauge 11. When the condensate reaches the set value, the data is fed back to open the electric valve 7 to drain the liquid, so as to realize the linkage control of the electric valve and the liquid level gauge, and realize unattended discharge of the condensate; in the third case, the gas is completely condensed, and the condensate is collected in the pipe box 6. When the condensate reaches the set value, the electric valve 7 is fed back to drain the liquid, or the electric valve 7 is kept normally open to discharge the condensate.

[0022] The cold side medium (gas or liquid) enters from the outside of the shell through the cold medium inlet pipe 5 from the N4 port, and exits from the N5 port through the cold medium outlet pipe 4, so that the cold and hot media can achieve wall-to-wall heat exchange in the welded plate heat exchanger 3. When in use, the hot medium (high-pressure medium) goes inside the outer shell 2, such as Figure 2 As shown, there are many contact points between the plates of the welded plate heat exchanger 3, and the plate contacts are more fully contacted after the high-pressure medium gives a certain pressure, so that the welded plate heat exchanger 3 can withstand the high pressure of the shell and the heat transfer effect will be better.

[0023] When the cold side medium is toxic and harmful, it enters from the N4 pipe port and exits from the N5 pipe port. In this way, when a leak occurs, the medium leaks into the outer shell 2 and is protected by the shell to avoid splashing and injuring the body, polluting the environment, and reacting violently with the air to cause an explosion.

[0024] The outer shell 2 is provided with a lifting lug 13 for easy use and maintenance;

[0025] The base is provided with an inspection hole. When necessary, the inspection hole blind plate 10 is opened to facilitate later cleaning and maintenance.

[0026] When the utility model is working, the shell side heat medium fills the space between the welded plate heat exchanger and the outer shell, and further exchanges heat with the welded plate heat exchanger in a wall-type manner under the push of pressure; the outer shell structure arranged outside the welded plate heat exchanger is used to meet the working condition that the pressure of the hot side medium is higher than that of the cold side medium, and the outer shell structure is evenly stressed to avoid stress concentration; effective protection is formed on the outside of the welded plate heat exchanger to prevent leakage of toxic and harmful media, and at the same time, the structure can reduce the manufacturing cost of high-pressure heat exchange equipment and improve the safety and service life of the equipment.

[0027] The above are only preferred examples of the present invention. It should be pointed out that for ordinary technicians in this field, under the technical inspiration provided by the present invention, as common knowledge in the mechanical field, other equivalent variations and improvements can be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A new type of built-in plate heat exchanger, characterized in that: The invention comprises an outer shell (2), wherein the top of the outer shell (2) is connected to a heat medium inlet pipe (1), and lifting ears (13) are provided on both sides of the heat medium inlet pipe (1); a welded plate heat exchanger (3) is provided inside the outer shell (2); a cold medium inlet pipe (5) penetrating the side wall of the outer shell (2) is connected below the side of the welded plate heat exchanger (3), and a cold medium outlet pipe (4) penetrating the side wall of the outer shell (2) is connected above; a pipe box (6) is connected to the central bottom of the welded plate heat exchanger (3); a non-condensed medium outlet pipe (12) penetrating the side wall of the outer shell (2) is connected to the side of the pipe box (6); a flange-type differential pressure level gauge (11) inserted into the pipe box (6) is provided below the non-condensed medium outlet pipe (12); and a condensate outlet (8) is connected to the bottom of the pipe box (6) via an elbow; an equipment base (9) is provided at the bottom of the outer shell (2), and a blind plate (10) for inspection is provided at the center of the equipment base (9).

2. A novel built-in plate heat exchanger according to claim 1, characterized in that: An electric valve (7) is provided on the condensate outlet (8).

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