KR900008081Y1 - Separate heat exchanger utilizing heat pipe - Google Patents

Abstract

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Description

Separate Heat Pipe Heat Exchanger

1 is a structural principle diagram of a heat pipe type heat exchanger.

2 is a structural diagram of a conventional general heat exchanger.

3 is a structural diagram of a conventional split heat exchanger.

4 is an assembly configuration of the heat management unit of the present invention.

5 is a perspective view of the internal assembly of the heat exchanger of the present invention.

6 is an external perspective view of the present invention.

* Explanation of symbols for main parts of the drawings

1: Heat pipe heat pipe 2, 2 ': Precipitation pipe

3: condenser body 4: insulated tube

5 ': entrance 5 ": exit

7: tube steel 8: hydraulic fluid inlet

9: vacuum exhaust 10: heat pipe lower header

11 working fluid heater 12 thermocouple

13 compensation wire 14 temperature indicating controller

16: connector

17: SOOT-BLOW NOZZLE PIPE

25: lower header housing 26: re-resistance hopper

28 gas inlet 29 air outlet

The present invention relates to a separate heat pipe type heat exchanger in a heat exchanger for recovering heat of industrial waste heat gas to preheat water.

Heat pipe type heat exchanger is largely divided into general type and separate type. In general type heat exchanger, working fluids such as water, alcohol, freon, and fruit are enclosed in a sealed pipe air stream as shown in FIG. Is fitted with a heat pipe.

On the surface of this heat pipe, fins protrude, the evaporation part and the condensation part are formed on both sides of the separator, and as shown in FIG. 2, dozens or hundreds of heat pipes are assembled and used according to the capacity of the heat exchanger.

In the general heat exchanger, when the exhaust gas passes outside the heat pipe of the evaporator, the working fluid inside the heat pipe absorbs heat of the exhaust gas to vaporize and evaporate, and the vapor of the working fluid flows to the condenser in the heat pipe. As the preheating fluid (water or gas) passes outside the heat pipe of the condenser, the vapor of the working fluid in the heat pipe loses heat and condenses. The condensed working fluid is returned to the evaporator by the gravity or capillary pumping force on the inner wall of the heat pipe. The returned working fluid continues the heat exchanger while repeatedly circulating the process of absorbing heat and evaporating and moving to the condensation unit as described above.

As such, the general heat pipe type heat exchanger is a type in which a working fluid transfers heat while repeating evaporation and condensation in a sealed heat pipe.

On the other hand, as shown in FIG. 3, the separate heat exchanger is completely provided with a connection tube for completely separating and installing the heat exchanger of the condenser and the heat exchanger of the evaporator, and transporting the working liquid therebetween. The heat transfer process of the exhaust gas passing outside the heat pipe is vaporized by absorbing heat from the evaporator by the enclosed working fluid and condensed through the connection pipe between the evaporator and the condenser. The preheating process, which is moved to the outside and flows out of the heat pipe in the condenser, is condensed after losing heat by a fluid (water or gas).

The condensed working fluid is returned to the evaporation section through the connecting pipe again.

In this way, the separate heat exchanger is formed between the evaporator and the condenser to form a separate heat exchange.

However, the conventional type and separate type heat pipe type heat exchangers each have their own drawbacks. In the case of the general type, the tank is required to have a cylindrical shape in order to distribute the pressure on the water supply side under high pressure. It was difficult to connect a number of heat pipes and the risk was high, so the tank generally had to be manufactured in a rectangular shape.

In addition, in the case of the separate type, the condensation part can be manufactured in a cylindrical shape, but it can be used for high pressure.

In addition, when the temperature of the exhaust gas is lowered and the temperature reaches the dew point, both the conventional type and the separated type have a low temperature corrosion, shorten the lifespan, and condense the gas below the dew point. Since the contained residues stick together, there is a defect that the function of the heat exchanger is degraded and an unusable state occurs due to an increase in the furnace pressure, and there is no function of discharging non-condensable gas generated in the heat pipe. It has been a cause of degrading the performance of the heat pipe.

The present invention is designed to eliminate such a conventional problem, and the heat transfer pipe itself of the evaporator unit serves as the evaporator heat pipe and the connection pipe at the same time, and the condensed working fluid is recovered through a separate downcomer. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

4 is an assembly configuration diagram of the heat transfer tube portion of the present invention, wherein the heat pipe heat transfer tube 1 of the evaporation portion is connected between the upper condenser body 3 and the heat pipe lower header 10.

The heat pipe heat pipe (1) is arranged so that the waste heat gas is in the middle of the passage, and a downfall pipe (2) (2 ') is provided with the working fluid is lowered at both ends, the condenser body (3) to heat the water supply The heat transfer pipe 4 is built-in, and the tube steel plate 7 is provided at both ends, and the heat transfer pipe 4 is assembled and fixed.

A vacuum exhaust port 9 and a working liquid inlet 8 and a bimetallic air discharger 29 for removing non-condensable gas are attached to the condenser body 3. A working fluid heater 11 is built in the heat pipe lower header 10, and a thermocouple 12 is attached to the surface of the header 10, and is connected to the temperature indicating controller 14 through a compensation lead 13. .

In addition, the heat pipe heat pipe 1 is connected to the condenser body 3 and the header 10 by heat, and the soot nozzle pipe 17 is vertically arranged toward the gas inlet 28 '.

The heat transfer pipe unit as described above is connected and used as shown in FIG. 5 according to the capacity of the heat exchanger. 6 is an external perspective view of the outer housing of the heat exchanger in which the heat pipe part is connected and assembled, wherein the heat pipe heat pipe 1 is bundled separately, but the water supply is connected to the heat pipe in each condenser body 3 through the connection pipe 16. In (4), it is connected to the next condenser body (3) and assembled to exchange heat by passing several times as necessary.

All heat pipe heat pipes (1), heat pipes (4), and the header (10) are completely assembled and welded to the heat pipe, and the heat pipe heat pipe (1) and the lower header (10) are working fluids, such as water, fruit, alcohol, and freon. After the back is injected, the interior is formed in a vacuum state through the vacuum exhaust port 9.

Reference numeral 18 is a solenoid valve, 21 and 23 are inlet and outlet diffusers, 22 is a side cover, 25 is a lower header housing, 26 is a re-stored hopper.

Referring to the action and effect of the separate heat pipe type heat exchanger of the present invention configured as described above are as follows. First, the gas having the waste heat enters the gas inlet 28 'and the diffuser 21, passes through the soot nozzle nozzle 17, and passes through the gap on the surface of the heat pipe heat pipe 1, thereby transferring heat. When the gas is delivered to the working fluid injected inside and exhausted through the exhaust gas outlet diffuser 23 to the chimney, the working fluid injected inside the heat pipe heat pipe 1 receives heat transferred from the outside of the heat pipe 1. It is evaporated on absorption and enters the inside of the condenser body 3 on the upper side and is in contact with the surface of the heat pipe 4.

On the other hand, the water supplied flows through the inlet (5 ') into the heat pipe (4) arranged in the tube steel sheet (7), and heats the steam of the working fluid outside the heat pipe (4) through the heat pipe (4) wall. Absorbed and heated.

The primary heated feed water enters the condenser body 3 of the next stage through the connecting tube 16 and is heated up in the same process and exits the outlet 5 "of the last condensate body 3 and is supplied to the necessary equipment.

The steam of the working fluid deprived of heat is condensed and liquefied and recovered to the heat pipe lower header 10 through the downcomer pipes 2 and 2 '.

The recovered working fluid is again evaporated in the heat pipe heat transfer pipe 1 to transfer heat to the condenser while repeating the above-described process.

On the other hand, if the ash or dust contained in the combustion exhaust gas is deposited on the surface of the heat pipe heat pipe 1, the heat transfer efficiency is reduced, so that the soot nozzle nozzle 17 is the front surface of the heat pipe heat pipe 1 Arranged in order to open and close the externally mounted solenoid valve 18 by a series of automatic timer device, the compressed air is discharged through the soot nozzle nozzle 17, the heat pipe heat pipe (1) It is possible to remove the combustion residues in the powder state attached to the surface of the cyclical automatic material is possible.

Combustion exhaust gas using bunker oil as fuel contains sulfurous acid gas, and when the temperature is too low to reach the dew point, water vapor condenses in the combustion gas to become sulfuric acid, which causes corrosion of the surface of the heat pipe tube (1). In order to prevent this low temperature corrosion, the thermocouple 12 is attached to the surface of the lower heat header 11 and the lower heat header 10 among the gas contact heat pipes, and the surface temperature of the pipe wall is increased. By operating the heater 11 by the temperature indicator controller 14 to keep it above the dew point, the surface of the heat pipe heat pipe 1 is kept above the dew point to prevent corrosion. In addition, the upper condenser body 3 is equipped with a bi-metal narrow type air exhauster 29 so that non-condensable gas is generated in the heat pipe heat pipe 1 at the start of the condenser body 3. It is collected to the top and discharged to the outside automatically, and the lower header housing 55 and re-storage hopper 26 and the cover 22 are assembled on the side of the heat exchanger under which combustion residues can be collected. The internal inspection and repair are possible if necessary.

As described above, the separate heat pipe type heat exchanger of the present invention is not only easy to manufacture as a high-pressure water supply preheater, but also prevents pipe surface deposition, seizure, and low temperature corrosion prevention of combustion gas residues. It is possible to maintain the heat pipe, greatly extend the lifespan, and to automatically discharge the non-condensable gas generated from the working fluid and materials in the heat pipe tube to the outside during operation. It is devised.

Claims (1)

Heat pipe heat pipe (1) and precipitation between the condenser body (3) built-in condenser heat pipe (4) connected to the connection pipe (16) and the heat pipe lower header (10) in which the working fluid heater (11) is built Connecting the pipes (2) and (2 ') and mounting the inlet (5') and the outlet (5 ") before and after the condenser body (3), and the working liquid inlet (8) and the air outlet (29) above. Separating heat pipe type, characterized in that the thermocouple 12 and the temperature indicating controller 14 is attached to the heat pipe lower header 10 and the soot nozzle nozzle 17 is mounted in front of the heat pipe heat pipe 1. heat transmitter.