KR101075534B1 - Heat Exchanger for EGR Cooler Performance and Thermal cycle test and Engine Exhaust Gas Simulation - Google Patents

Abstract

The present invention relates to an EGR cooler performance and heat cycle test and an engine exhaust heat exchanger.

The present invention provides an EGR cooler heat cycle test apparatus including a heat exchanger for supplying high temperature and high pressure air to an EGR cooler, wherein the heat exchanger is provided with a refractory installation duct in the upper part of the heat exchanger. The open front part has a body in which a flame induction pipe is installed by a plurality of connecting bars, and an outer case installed to surround the outer circumference of the body and is laminated with a heat insulator and ceramic, and is installed in the installation space of the body and has a diameter. Composed of the first, second, and third coil parts different from the inlet and the outlet port is exposed to the outside of the main body and the outer case, the coil pipe is installed in the front part of the main body in the state connected to the flame induction pipe and It is constructed by stacking ceramics and has a fireproof block body in which a burner installation hole is perforated, and a fireproof block body inserted into the burner installation hole. It provides an information installed burner, a heat exchanger of the EGR cooler heat cycle test device characterized in that it comprises a refractory material secured to the front portion of the main body so as to surround the refractory block body.

EGR cooler, test equipment

Description

Heat Exchanger for EGR Cooler Performance and Thermal cycle test and Engine Exhaust Gas Simulation}

The present invention relates to a heat exchanger, and more particularly, to an EGR cooler performance and heat cycle test and engine exhaust gas simulated heat exchanger capable of directly heating high-pressure air to obtain a high-temperature, high-pressure air suitable for testing.

Typically, gasoline engines and diesel engines employ an EGR cooler (Exhaust Gas Recirculation Cooler) to reduce NOx in the exhaust gas emitted from the engine. Nitrogen oxides (NOx) are produced when nitrogen and oxygen pass through a flame at high temperature and high pressure in a combustion chamber. The higher the combustion temperature, the greater the amount of generation. The EGR cooler recycles a portion of the exhaust gas through the engine intake system. By lowering the combustion temperature when the fuel is combusted to perform the function of suppressing the generation of nitrogen oxides (NOx).

Accordingly, the EGR cooler is provided with a plurality of exhaust gas pipes through which the exhaust gas flows inside the body, and configured to allow cooling water to flow around the exhaust gas pipes. The EGR cooler includes an EGR cooler through which the exhaust gas passed through the exhaust gas pipes passes. Compared to before passing through the calorie per unit time (kcal / h) is reduced by a certain amount or more to achieve the desired performance, the durability is also good to be able to continue to perform the desired function.

Accordingly, in order to implement the desirable performance and durability of the EGR cooler, the performance and durability test of the EGR cooler will be very important, and such a test apparatus of the EGR cooler is an automobile EGR registered by the present applicant as Korean Patent Registration No. 603502. Cooler heat cycle tester.

1 is an overall configuration diagram for explaining the vehicle EGR cooler heat cycle test apparatus registered in Korea Patent Registration No. 603502.

Referring to FIG. 1, the pre-registered test apparatus includes an air induction apparatus for injecting high temperature and high pressure air corresponding to the exhaust gas into the EGR cooler 10, and a coolant induction apparatus for injecting cooling water into the EGR cooler. do. At this time, the air induction apparatus is composed of a waste heat exchanger (67), a primary heating heat exchanger (70), a secondary heating heat exchanger (71) to sequentially heat the air compressed at high pressure in the air compressor (61). It is then supplied to the EGR cooler (10).

However, the primary heating heat exchanger 70 and the secondary heating heat exchanger 71 of the pre-registered test apparatus are heated in a conventional heating medium boiler method, for example, a heating medium to which water or other fluid is applied by an electric heater or burner. Since the heat medium boiler is adopted to heat exchange the heat medium and the air, there is a problem that the air cannot be heated above a predetermined temperature. In other words, the heat medium boiler method has a problem in that the high pressure air cannot be heated above a predetermined temperature (above 400 ° C.) because the fluid evaporates when the heat medium fluid is heated above a predetermined temperature. On the other hand, when the air is heated by the burner's direct fire method, there is a problem that the flame is turned off when an environment of high temperature and high pressure is formed inside the heat exchanger.

Therefore, the heat exchangers of the pre-registered test apparatus cannot obtain the air temperature suitable for the performance test and the endurance test and thus cannot perform the accurate test, and in particular, the temperature change of the hot air supplied to the EGR cooler periodically changes or abruptly changes. There is a problem in that it is not possible to carry out a heat cycle test and a thermal shock test.

Therefore, the present invention was devised to solve the general problems of the pre-registration test apparatus,

The problem to be solved by the present invention is to provide a heat exchanger of the EGR cooler heat cycle test apparatus that can heat the high-pressure air to a desired temperature to suit the performance test, endurance test, heat cycle test and thermal shock test test have.

As a specific means of the present invention for solving the above problems;

In the EGR cooler heat cycle test apparatus including a heat exchanger for supplying high-temperature, high-pressure air to the EGR cooler, the heat exchanger is provided with a refractory installation duct in the interior and a fire-resistant exhaust duct on the upper The front part is installed to cover the outer circumference of the main body and the body, the flame induction pipe is installed by a plurality of connecting bars, the outer case consisting of laminated insulation and ceramic, and installed in the installation space of the main body to vary the diameter Composed of the first, second, and third coil parts, the inlet and the outlet are exposed to the outside of the main body and the outer case, and installed in the front portion of the main body in the state connected to the flame induction pipe and refractory and ceramic The fireproof block body is formed by laminating and the burner installation hole is drilled in the central portion thereof, and the fireproof block body is inserted into the burner installation hole. And a group defined as the installed burner, a heat of the EGR cooler heat cycle test device comprising a refractory material secured to the front portion of the main body so as to surround the refractory block body.

In a preferred embodiment, the front portion of the main body may be provided with a first fixing piece for fixing the refractory brick, and a second fixing piece for fixing the connecting bar.

In a preferred embodiment, a space for preventing heat conduction may be provided between the front part of the main body and the fire block and the fire brick.

In a preferred embodiment, the inlet of the coil pipe is branched into a first inlet pipe and a second inlet pipe, and the first, second and third coil parts are wound around the first inlet pipe and the second inlet pipe in a cylindrical shape. It is configured to take, and the outlet has a structure in which the first inlet pipe and the second inlet pipe aeration, may further include a branching port.

More preferably, the first coil, the second coil, and the third coil part may be configured by winding the second coil part and the third coil part sequentially in an inner diameter of the first coil part. In a preferred embodiment, the refractory block body may be provided with a plurality of rigid reinforcement pins therein.

As described above, the heat exchanger of the EGR cooler thermal cycle test apparatus according to the present invention can obtain a high temperature air of 900 ℃ or more by the high pressure air is directly heated by the burner via the coil pipe, the performance test and durability of the EGR cooler In addition to the test, it is possible to supply the EGR cooler with hot air suitable for a thermal cycle test that changes the temperature of the air freely and periodically and a thermal shock test that changes the air temperature greatly and rapidly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used to refer to the same components, even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a cross-sectional view for explaining the overall configuration of the heat exchanger of the EGR cooler heat cycle test apparatus according to the present invention.

2, the heat exchanger of the present invention, the main body 2, the outer case 3, the coil tube 4, the refractory block 5, the burner 6, the refractory brick 7 It is configured to include).

The main body 2 is configured in the form of a heating furnace of a boiler whose front part is opened. The main body 2 is provided with a refractory installation space portion 21 therein, and is provided with a fire-resistant discharge duct 22 thereon, such an installation space portion 21 and the discharge duct ( The refractory treatment of 22) preferably uses castable refractory material, that is, an amorphous refractory material in which cement and aggregate are blended. In addition, it is preferable to form a support 24 for the stable installation in the lower portion of the main body.

At this time, the front portion 23 of the main body 2 is provided with a first fixing piece 233 in the form of a flange at the end thereof, and a second fixing piece 234 is provided therein so that the second fixing piece ( 234 through the flame guide pipe 232 is installed.

3 is a side cross-sectional view of an excerpt for explaining the front portion of the main body of the heat exchanger according to the present invention.

Referring to FIG. 3, at least four connection bars 231 are provided at a predetermined interval in the second fixing piece 234 provided on the front part 23 of the main body 2, and each of the connection bars 231 is provided at a predetermined interval. At the end is a cylindrical flame guide tube 232 is coupled. As shown in FIG. 2, the flame guide pipe 232 has one end protruded to the front portion 23 of the main body 2 and the other end of the main body 2 in the state of being coupled to the connection bar 231. Located inside, the flame induction pipe 232 serves to guide the flame generated from the burner 6 to be described later to the interior of the body 2, that is, the installation space 21.

Referring back to Figure 2, the outer case 3 is installed as a structure surrounding the outer circumference of the body (2). The outer case 3 has a structure in which the heat insulating material 31 and the ceramic 32 are laminated, for example, a laminated structure in which the upper and lower portions of the heat insulating material 31 are wrapped by the ceramic 32.

The coil pipe 4 is embedded in the installation space portion 21 of the main body 2. The coil tube 4 is made of an Inconel alloy, that is, an alloy composed of nickel, chromium, iron, carbon, and the like as its main component, and an Inconel alloy having high heat resistance and rust resistance.

Figure 4a is a side configuration diagram showing the coil tube in the heat exchanger according to the present invention, Figure 4b is a side cross-sectional view for explaining the coil tube in the heat exchanger according to the present invention.

4A and 4B, the coil pipe 4 includes first, second, and third coil parts 41, 42, and 43 having different diameters, and includes an inlet 44 and an outlet 45. 3 is exposed to the outside of the main body 2 and the outer case (3). At this time, the inlet 44 of the coil pipe 4 has a structure branched into the first inlet pipe 46 and the second inlet pipe 47, the first, second, third coil portion 41 (42,43) is formed by winding the first inlet pipe (44) and the second inlet pipe (45) in a cylindrical shape in two rows, such first, second, third coil parts (41, 42, 43, the second coil part 42 and the third coil part 43 are sequentially wound on an inner diameter of the first coil part 41 so that each coil part has a different diameter. In addition, the outlet 45 of the coil pipe 4 has a structure in which the first inlet pipe 46 and the second inlet pipe 47 are agitated, and such outlet 45 has a branch 48. It is provided.

Here, the branch opening 48 has the same structure as the outlet 45, and is a pipe-shaped tube to which low-temperature cooling air is supplied, and high-temperature and low-temperature air is applied in a thermal shock test or a thermal cycle test. It should be repeatedly supplied to EGRC, where the high temperature is supplied through the heat exchanger and the heated air is supplied, and the low temperature is the normal temperature air is supplied from the branch opening 48.

In addition, by properly adjusting and mixing the amount of air flowing into the outlet 45 and the branch port 48, the temperature of the air required for the thermal shock test, the thermal cycle test, or the like is generated.

At this time, the inlet 44, the outlet 45 and the branch 48 of the coil pipe 4 is preferably provided with a flange at its end so that it can be connected to other pipes by a conventional flange coupling, such a flange At the time of joining, it is preferable to put a sealing material such as a packing on the joining portion.

In addition, in order to utilize waste heat, a conventional waste heat heat exchanger or the like may be installed in the outlet 45 so that the compressed air is primarily heated, and the heated air is introduced into the outlet 45.

Referring to FIG. 2 again, the refractory block body 5 is installed in a space between the front part 23 of the main body 2, for example, the second fixing piece 234 and the first fixing piece 233. The refractory block body 5 is formed by stacking the refractory material 51 and the ceramic 52, and a burner installation hole 53 is drilled in the center portion thereof. In addition, the burner (burner using a fossil fuel) is fixed to the refractory block body 5 while being inserted into the burner installation hole 53 so as to transmit the flame to the coil pipe 4. The refractory brick 7 includes an opening hole 71 in which the burner 6 is installed and is fixed to the front portion 23 of the main body 2 so as to surround the refractory block 5.

At this time, a spaced space portion 8 for preventing heat conduction is provided between the front portion 23 of the main body 2 and the refractory block 5 and the refractory brick 7.

FIG. 5 is a cross-sectional view of main parts for explaining a coupling state between a refractory block and a refractory brick in the heat exchanger according to the present invention.

Referring to FIG. 5, first, the refractory block body 5 is configured to have an outer diameter smaller than the inner diameter of the front portion 23 of the main body 2, and is connected to the flame induction pipe 232 so as to connect the main body 2. It is fixed to the front portion (23) of. To this end, a coupling groove 54 is provided at the rear of the refractory block 5, and as shown in FIG. 5, in the coupling groove 54, one end of the flame guide pipe 232 is inserted. The ceramic 541 is filled to connect the flame induction pipe 232 and the refractory block 5.

At this time, the refractory block body 5 is coupled to the second fixing piece 234 provided on the front portion 23 of the main body 2 so as to be spaced apart by a predetermined interval, the refractory block body 5 and the main body 2 The spaced space portion 8 is formed between the front portion 23 of the.

In other words, the refractory block body 5 is provided with an outer diameter smaller than the inner diameter of the front part 23 of the main body 2, and thus the outer diameter surface of the refractory block body 5 and the front part 23 of the main body 2. The inner diameter surface is spaced apart by a predetermined interval, and the side surface of the refractory block body 5 is also spaced apart from the second fixing piece 234 by a predetermined interval so that the front portion of the refractory block body 5 and the main body 2 A space 8 is formed between the spaces 23.

Here, the refractory block body 5 is formed by stacking the refractory material 51 and the ceramic 52, it is preferable to install a plurality of rigid reinforcement pins 55 therein to complement the rigidity, the refractory It is preferable to configure the inclined surface 56 at the rear of the block body 5 for guiding the flame of the burner 6 to the flame guide pipe 232.

On the other hand, the refractory brick 7 is fixed to the front portion 23 of the main body 2 by a plurality of fixing bolts 72 as shown in enlarged in FIG. To this end, a plurality of support bolts 235 to which the fixing bolt body 72 is coupled are installed in the first fixing piece 233 of the front part 23 of the main body 2. At this time, the refractory brick 7 is coupled to the first fixing piece 233 so as to be spaced apart by a predetermined interval, so that the first fixing piece 233 of the refractory brick 7 and the front portion 23 of the main body 2. The spaced space portion 8 is formed therebetween.

Accordingly, the space between the front portion 23 and the refractory block body 5 of the main body 2 and the coupling portion between the front portion 23 and the refractory brick 7 of the main body 2 is separated. The space portion 8 is formed, and the spaced space portion 8 is configured to communicate with each other, so that the heat conduction between the main body 2 and the fireproof block 5 and the main body 2 and the firebrick 7 The heat conduction between the liver can be prevented, and the phenomenon in which the main body 2 and the refractory block body 5 or the main body 2 and the refractory brick 7 stick together due to high heat can be prevented.

Therefore, the working state of the heat exchanger of the EGR cooler heat cycle test apparatus according to the present invention having the configuration as described above will be described.

At this time, the heat exchanger according to the present invention is applied to the 'automotive EGR cooler heat cycle tester' registered in the Republic of Korea Patent No. 603502 by the applicant as described above to omit the description of the overall operation of the test apparatus. Shall be.

6 is a configuration diagram for explaining the operating state of the heat exchanger according to the present invention.

Referring to Figure 6, the heat exchanger 1 of the present invention is a test apparatus of the EGR cooler, an air induction device for supplying high temperature and high pressure air to the EGR cooler, such as an air compressor, a storage tank and a waste heat exchanger, etc. It is included in the air induction device is configured to perform the function of heating the high-pressure air to high temperature to supply to the EGR cooler. To this end, the inlet 44 of the coil pipe 4 protruding out of the main body 2 is a high pressure air supply pipe, that is, a high pressure air supply pipe that is compressed to high pressure in an air compressor and supplies high pressure air preheated in a waste heat exchanger. Is connected. In addition, the outlet 45 and the branch 48 of the coil pipe 4 are connected to the EGR cooler.

Therefore, the heat exchanger 1 connected to the pipe as described above is to heat the high-pressure air supplied to the coil pipe 4 by the burner 6 directly to heat the high-pressure air to a desired temperature, that is to 900 ℃ or more high temperature do,

In detail, the high-pressure air introduced into the inlet 44 of the coil pipe 4 branches through the first inlet pipe 46 and the second inlet pipe 47, and then the first coil part 41 and the first coil part 41. It is directly heated by the flame generated by the burner 6 via the second coil part 42 and the third coil part 43. At this time, in the present invention, the inlet 44 is branched into the first and second inlet pipes 46 and 47, and each of the coil parts 41, 42, and 43 is configured in the form of a coil, so that high-pressure air is burned. By ensuring a time that can be sufficiently heated by the high-pressure air can be heated to a high temperature to a desired temperature.

Particularly, each of the coil parts 41, 42, and 43 has a structure in which the second and third coil parts 42 and 43 are sequentially wound around the inner diameter of the first coil part 41, so that high-pressure air is used as the first coil. After the heating is performed via the second coil parts 41 and 42 and the third coil part 43 directly in contact with the flame is heated to a high temperature, air of a desired high temperature can be obtained.

In addition, the heat exchanger main body 2 of the present invention is provided with a discharge duct 22 for discharging the combustion gas of the burner 6 to the outside, so that a high-temperature, high-pressure environment is not formed therein, so that the flame is not intended. The main body 2 can be prevented from being extinguished, and the main body 2 is heat-resistant itself and is heat-treated twice by the outer case 3, the fire block 5 and the fire brick 7, thereby safer heating. You can do it.

Therefore, the heat exchanger 1 of the present invention can directly heat the high-pressure air by the burner 6 to obtain a high temperature air of 900 ℃ or more, at a temperature of approximately 450 ℃ to 525 ℃ or 700 ℃ to 900 ℃ In addition to the performance test and endurance test of the EGR cooler, high temperature air suitable for the thermal cycle test that changes the temperature of the air freely and periodically and the thermal shock test that changes the temperature of the air drastically and rapidly can be supplied to the EGR cooler. It is possible to carry out an accurate test.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is an overall configuration diagram for explaining a vehicle EGR cooler heat cycle test apparatus according to the prior art.

2 is a cross-sectional view for explaining the overall configuration of the heat exchanger of the EGR cooler heat cycle test apparatus according to the present invention.

3 is a side cross-sectional view of an excerpt for explaining the front portion of the main body of the heat exchanger according to the present invention.

Figure 4a is a side configuration diagram showing the coil tube in the heat exchanger according to the present invention.

Figure 4b is a side cross-sectional view for explaining the coil tube in the heat exchanger according to the present invention.

FIG. 5 is a cross-sectional view of main parts for explaining a coupling state between a refractory block and a refractory brick in the heat exchanger according to the present invention.

6 is a configuration diagram for explaining the operating state of the heat exchanger according to the present invention.

<Explanation of symbols for major parts of drawing>

1: heat exchanger 2: body

3: outer case 4: coil tube

5: fireproof block body 6: burner

7: refractory brick 8: space part

21: installation space part 22: discharge duct

23: front part 24: support

31: heat insulating material 32: ceramic

41: first coil part 42: second coil part

43: third coil part 44: inlet

45: outlet 46: first inlet pipe

47: 2nd inflow hall 48: branching port

51: fireproof material 52: ceramic

53: burner installation hole 54: coupling groove

55: rigid reinforcement pin 56: inclined surface

71: opening hole 72: fixing bolt body

Claims (6)

In the EGR cooler thermal cycle test apparatus comprising a heat exchanger for supplying high temperature, high pressure air to the EGR cooler, The heat exchanger is provided with a fire-resistant installation space inside, the upper part of the installation space is provided with a fire-resistant discharge duct, the open front portion of the main body is installed with a flame induction pipe by a plurality of connecting bars, An outer case installed to surround the outer circumference of the main body and formed by laminating insulation and ceramic; A coil pipe which is installed in the installation space of the main body and is composed of first, second and third coil parts having different diameters and the inlet and the outlet are exposed to the outside of the main body and the outer case; It is installed in the front part of the main body in the state connected to the flame induction pipe and is formed by stacking the refractory material and ceramics, the central part of the main body is a fireproof block body perforated burner installation hole, A burner fixed to the fireproof block body in a state of being inserted into the burner installation hole; Heat exchanger of the EGR cooler heat cycle test apparatus, characterized in that it comprises a refractory brick fixed to the front portion of the main body to surround the refractory block. The method of claim 1, The heat exchanger of the EGR cooler heat cycle test apparatus, characterized in that the front part of the main body is provided with a first fixing piece for fixing the refractory brick, and a second fixing piece for fixing the connecting bar. The method of claim 1, The heat exchanger of the EGR cooler heat cycle test apparatus, characterized in that the space between the front portion of the main body, and the refractory block body and the refractory brick to prevent the heat conduction is formed. The method of claim 1, The inlet of the coil pipe is branched into a first inlet pipe and a second inlet pipe, and the first, second, and third coil parts are formed by winding the first inlet pipe and the second inlet pipe in a cylindrical shape. EGR cooler heat cycle test, characterized in that the first inlet pipe and the second inlet pipe has a structure, the branch further comprises a branch, the outlet and the outlet is a waste heat heat exchanger for utilizing waste heat Heat exchanger of the device. The method according to claim 1 or 4, The heat exchanger of the EGR cooler thermal cycle test apparatus, characterized in that the first, second, third coil portion is wound around the second coil portion and the third coil portion in the inner diameter of the first coil portion. The method of claim 1, Heat exchanger of the EGR cooler heat cycle test apparatus, characterized in that a plurality of rigid reinforcement fins are installed inside the refractory block body.

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