CN210070689U

CN210070689U - Composite phase change heat exchanger

Info

Publication number: CN210070689U
Application number: CN201920764622.XU
Authority: CN
Inventors: 徐连波; 张勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-02-14
Anticipated expiration: 2029-05-24

Abstract

The utility model discloses a composite phase change heat exchanger, the heat exchanger include the phase change heat exchanger hypomere, this hypomere is a steel structure casing, there are flue gas inlet and exhanst gas outlet on the casing, there are two or more helical fin tube bundles in the casing, each helical fin tube bundle constitutes snakelike return circuit through 180 elbows end to end, add the heat medium in each snakelike return circuit, and the top in each snakelike return circuit is connected with the phase change heat exchanger steam pocket barrel through the ascending antithetical couplet pipe in the ascending pipeline, the phase change heat exchanger steam pocket barrel then is connected with the bottom in each snakelike return circuit through descending antithetical couplet pipe in the decline pipeline, there is the tube bank in the phase change heat exchanger steam pocket barrel. The utility model discloses a compound phase transition heat exchanger, thereby below adopt liquid cooling high temperature flue gas to promote the process that the temperature made liquid become gas, and the vapor that the top steam pocket got into through the below heats cold water in wall side and the pipe wall, makes cold water heat to the assigned temperature and makes steam temperature reduce the condensation for liquid, descends again to flow back to below flue gas cooling section.

Description

Composite phase change heat exchanger

Technical Field

The utility model relates to a heat exchanger field in the middle of the energy-conserving machinery, specific theory relates to a high-efficient compound phase transition heat exchanger in this field.

Background

With the further development of national economy, environmental pollution, the contradiction between resource waste and development becomes more and more serious, energy conservation and emission reduction are achieved, and the environment is protected to become a more and more concerned field. The heat exchanger (also called heat exchanger) is a device for transferring partial heat of hot fluid to cold fluid, plays an important role in chemical industry, petroleum industry, power industry, food industry and other industrial production, can be used as a heater, a cooler, a condenser, an evaporator, a reboiler and the like in chemical production, and is widely applied.

The conventional heat exchanger needs to increase the heat exchange area, improve the heat exchange coefficient or reduce the temperature of a cold source in order to improve the heat exchange efficiency, needs to increase the occupied area of equipment in order to increase the heat exchange area, and cannot be suitable for various conditions; higher-grade heat exchange materials are required to be adopted for improving the heat exchange coefficient, so that the cost investment is increased; lowering the temperature of the cold source can cause acid dew corrosion due to too low temperature, and the service life of the equipment is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a composite phase change heat exchanger that heat exchange efficiency is high and be difficult for the dewfall corruption is provided.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the improvement of a composite phase change heat exchanger is that: the heat exchanger comprises a lower section of the phase-change heat exchanger, the lower section is a steel structure shell, a smoke inlet and a smoke outlet are arranged on the shell, more than two spiral fin tube bundles are arranged in the shell, the spiral fin tube bundles are connected end to end through 180-degree elbows to form snake-shaped loops, heat media are added into the snake-shaped loops, the top ends of the snake-shaped loops are connected with a steam drum body of the phase-change heat exchanger through ascending connecting pipes in an ascending pipeline, the steam drum body of the phase-change heat exchanger is connected with the bottom ends of the snake-shaped loops through descending connecting pipes in a descending pipeline, tube bundles are arranged in the steam drum body of the phase-change heat exchanger, one end of each tube bundle is communicated with a water inlet of a pipe box, and the.

Furthermore, the flue gas inlet is an air inlet bell mouth.

Furthermore, a manhole is arranged on the smoke outlet.

Furthermore, the spiral fin tube bundle and the shell are welded by high-frequency welding.

Furthermore, pressure valves are arranged on the ascending connecting pipe and the descending connecting pipe.

Furthermore, a safety valve, a pressure valve and a thermometer are arranged on the steam drum body of the phase change heat exchanger.

Further, a temperature sensor is installed in the pipe box.

The utility model has the advantages that:

the utility model discloses a compound phase transition heat exchanger, thereby below adopt liquid cooling high temperature flue gas to promote the process that the temperature made liquid become gas, and the vapor that the top steam pocket got into through the below heats cold water in wall side and the pipe wall, makes cold water heat to the assigned temperature and makes steam temperature reduce the condensation for liquid, descends again to flow back to below flue gas cooling section.

The utility model discloses a compound phase transition heat exchanger is the novel indirect heating equipment who adopts brand-new theory design, and it has synthesized and has played different enhanced heat transfer's different technical advantages to according to the operation requirement of difference, with the help of setting up cold and hot fluidic different reposition of redundant personnel and different ratios, realize the optimal combination of modern high-efficient heat exchanger different structural style, and construct the compound phase transition heat exchanger of different concrete forms. Compared with the common heat exchanger, the heat exchanger can greatly reduce the exhaust temperature of waste gas and simultaneously maintain the wall temperature of the heating surface of the whole low-temperature section at a higher temperature level, thereby not only improving the thermal efficiency of heat-using equipment to the greatest extent, but also avoiding the low-temperature corrosion and ash blockage caused by condensation.

The utility model discloses a composite phase change heat exchanger, the heat exchange through circulating tube bank will receive the hot side and send out the hot side separation in the cavity of two differences of equipment hypomere and steam pocket, can not make rivers go into the flue gas system because of waterway system's damage, and is efficient, safe and reliable, and processing is simple and convenient, and easy maintenance can make full use of flue tail gas's waste heat add hot water. When the heat exchanger operates in a safe and stable state, the temperature can be 10-15 ℃ higher than that of a conventional heat exchanger, so that the temperature is controlled to be higher than the dew point temperature.

Drawings

Fig. 1 is a schematic front view of a composite phase change heat exchanger disclosed in embodiment 1 of the present invention;

fig. 2 is a schematic right view of the composite phase change heat exchanger disclosed in embodiment 1 of the present invention;

fig. 3 is a schematic top view of the composite phase change heat exchanger disclosed in embodiment 1 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiment 1, as shown in fig. 1-3, this embodiment discloses a composite phase-change heat exchanger, which includes a lower section 1 of the phase-change heat exchanger, the lower section is a steel structure shell, the shell is provided with a flue gas inlet 2 and a flue gas outlet 6, the shell is provided with more than two spiral fin tube bundles, each spiral fin tube bundle is connected end to end through a 180 ° elbow to form a serpentine loop, a heat medium is added into each serpentine loop, the top end of each serpentine loop is connected with a phase-change heat exchanger steam drum 11 through a riser pipe 8 in a riser pipe 3, the phase-change heat exchanger steam drum is connected with the bottom end of each serpentine loop through a downcomer pipe 9 in a downcomer pipe 4, the phase-change heat exchanger steam drum is provided with a tube bundle 12, one end of the tube bundle is communicated with a water inlet N2 of a pipe box 10, and the other end is communicated with a water outlet N1 of the pipe.

In this embodiment, the flue gas inlet is an air inlet bell mouth. A manhole 7 is arranged on the flue gas outlet.

The spiral fin tube bundle and the shell are welded by high-frequency welding, so that the welding is tight and firm and the thermal resistance is small. The pressure valves are arranged on the ascending connecting pipe and the descending connecting pipe, so that the pressure of the lower section of the whole phase change heat exchanger and the pressure of the connecting pipes can be detected, and the working under normal pressure is guaranteed. The steam drum body of the phase-change heat exchanger is provided with a safety valve, a pressure valve and a thermometer, the pressure and the temperature of the steam drum can be monitored at any time, corresponding adjustment is made, and the electromagnetic valve is adjusted to work so as to complete the adjustment and control of the whole system. The temperature sensor is arranged in the pipe box, and the flow of the inlet and the outlet is controlled by measuring the temperature of the liquid to be heated, so that the output temperature of the heated liquid is ensured, the equipment is ensured to work at the temperature above the dew point, and the service life of the equipment is prolonged.

The working process of the composite phase-change heat exchanger disclosed by the embodiment is as follows: high-temperature flue gas enters the lower section of the phase-change heat exchanger through the air inlet, liquid in a serpentine loop which is formed by finned tubes and 180-degree elbows and is added with liquid in advance is heated, the liquid is evaporated to enter an ascending connecting pipe and enters a barrel body of a steam drum of the phase-change heat exchanger through an ascending pipeline, a pipe bundle is arranged in the steam drum barrel, a medium to be heated enters the pipe box from a water inlet N2 of the pipe box and then enters the pipe bundle, the medium to be heated in the steam heating pipe bundle in the steam drum barrel returns to the pipe box after the medium to be heated is heated, the medium flows out from a water outlet N1 of the pipe box, steam in the steam drum barrel is cooled to be liquid, and the medium enters a descending connecting pipe through a.

Specifically, the composite phase change heat exchanger disclosed in this embodiment is implemented by the following technical solutions, including: high temperature section, low temperature section, linkage segment and control system. The high-temperature section is arranged in the middle of the high-temperature flue and is connected with the low-temperature section through the connecting section. The inlet end of the medium to be heated is the inlet end of the low-temperature section, the outlet end of the medium to be heated is the outlet end of the low-temperature section, the inlet end and the outlet end are separated through the partition plate, and the heating of the medium and the connection of the inlet end and the outlet end are realized through the tube bundle.

The high temperature section includes: the air inlet bell mouth, the steel structural frame, the finned tube, the elbow, the air outlet, the finned tube and the 180-degree elbow form a snake-shaped loop, and the heating medium absorbs high-temperature flue gas in the snake-shaped loop.

The connecting section includes: the liquid medium in the serpentine loop absorbs heat and evaporates to form steam which enters the low-temperature section through the ascending pipeline, and the steam cooled in the low-temperature section is in a liquid state and returns to the descending pipeline through the descending pipeline, so that the steam enters the serpentine loop to continuously absorb heat.

The low temperature section comprises: the heating medium enters the tube box through the water injection port, is heated by high-temperature steam in the cylinder through the tube bundle, and then flows back to the tube box to be discharged through the water outlet for waste heat utilization.

The electric control part comprises: PLC control system, temperature regulation valve, temperature test point, pressure regulating valve. The temperature and pressure sensing elements receive signals, and the PLC control system processes the signals to control water inlet and outlet, so that the whole system works efficiently and reliably.

The lower section of the device is a steel structural member, a plurality of spiral fin tube bundles are arranged in the shell, and the fins and the tube shell are welded by high-frequency welding, so that the welding is tight and firm, and the thermal resistance is small. The flue gas flows outside the finned tube, and the finned tube bundle is internally provided with a heating medium. The finned tube bundle is heated by flue gas, and the heat medium absorbs heat and is vaporized into steam, and the steam rises to a steam pocket under a small pressure difference, emits heat to the outside, and is condensed into liquid. The condensate returns to the finned tube bundle along the inner wall of the descending tube under the action of gravity, is heated and vaporized again, and is circulated in such a way, and the heat is continuously transferred from one end to the other end. The heat pipe has very small heat resistance, relatively great heat transfer rate, simple structure and unidirectional heat conducting characteristic, and the heat pipe has special mechanism to make the heat exchange between cold and hot fluid outside the pipe and strengthen heat transfer. Therefore, the temperature of the evaporation heat absorption section can be well ensured to reach a high enough degree, and the redundant heat in the high-temperature flue gas can be well recovered, so that the problem that the conventional heat exchanger is low in heat exchange efficiency and easy to dewing and corrode is solved.

Claims

1. The utility model provides a compound phase transition heat exchanger which characterized in that: the heat exchanger comprises a lower section of the phase-change heat exchanger, the lower section is a steel structure shell, a smoke inlet and a smoke outlet are arranged on the shell, more than two spiral fin tube bundles are arranged in the shell, the spiral fin tube bundles are connected end to end through 180-degree elbows to form snake-shaped loops, heat media are added into the snake-shaped loops, the top ends of the snake-shaped loops are connected with a steam drum body of the phase-change heat exchanger through ascending connecting pipes in an ascending pipeline, the steam drum body of the phase-change heat exchanger is connected with the bottom ends of the snake-shaped loops through descending connecting pipes in a descending pipeline, tube bundles are arranged in the steam drum body of the phase-change heat exchanger, one end of each tube bundle is communicated with a water inlet of a pipe box, and the.

2. The composite phase change heat exchanger of claim 1, wherein: the flue gas inlet is an air inlet bell mouth.

3. The composite phase change heat exchanger of claim 1, wherein: and a manhole is arranged on the flue gas outlet.

4. The composite phase change heat exchanger of claim 1, wherein: the spiral fin tube bundle and the shell are welded by high-frequency welding.

5. The composite phase change heat exchanger of claim 1, wherein: the ascending connecting pipe and the descending connecting pipe are provided with pressure valves.

6. The composite phase change heat exchanger of claim 1, wherein: a safety valve, a pressure valve and a thermometer are arranged on the steam drum body of the phase change heat exchanger.

7. The composite phase change heat exchanger of claim 1, wherein: a temperature sensor is installed in the pipe box.