A cyclone separation heat pipe heat exchanger

Abstract

The present invention relates to the technical field of heat pipe heat exchanger equipment, and particularly relates to a cyclone separation heat pipe heat exchanger, which includes a first cylinder for the heat exchange and circulation of impurity-free fluid medium and a second cylinder for the heat exchange and circulation of fluid medium containing impurities. The first cylinder and the second cylinder are connected by a flange partition. The first cylinder is located directly above the second cylinder. A plurality of heat pipes penetrate through the flange partition, and both ends of the plurality of heat pipes extend into the first cylinder and the second cylinder respectively. A drain pipe penetrates through the first cylinder and the flange partition. One end of the drain pipe extends into the second cylinder, and the other end extends outside the first cylinder. The outlet at the top of the drain pipe is the sewage outlet. The heat pipe heat exchanger of the present invention has the characteristics of anti-blocking, anti-corrosion, anti-scaling, high overall heat transfer coefficient and easy maintenance, and can be applied to the heat exchange between produced water in oil fields and clean water and the heat exchange between various similar sewage and clean water.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pipe heat exchangers, and particularly to a cyclone separation heat pipe heat exchanger. Background Art

[0002] With the increasing attention paid to the waste heat utilization of produced water from oilfields, industrial sewage, and domestic sewage, and in addition, as the oilfield development enters the middle and late stages, the content of produced water is continuously increasing, a large amount of low-temperature waste heat resources will be formed. In the waste heat utilization of produced water from oilfields, the produced water heat exchanger is a key device, which is related to the stability of the produced waste heat utilization system.

[0003] At present, the commonly used produced water heat exchangers in oilfields are plate heat exchangers, shell-and-tube heat exchangers, and spiral plate heat exchangers. Due to the characteristics of high salinity, easy scaling, strong corrosion, containing sediment, and containing dirty oil in the produced water from oilfields, the flow channels of plate heat exchangers are narrow and the heat exchange plates are thin. Corrosives, mineralized substances, sediment, and dirty oil in the produced water can easily cause corrosion perforation and blockage of the heat exchange plates, and it is difficult to repair; for shell-and-tube heat exchangers, if the produced water flows through the tube side, the tube-side flow channels are thin and are easily blocked, and as the inner wall of the tube side scales, the heat exchange efficiency drops significantly and it is difficult to repair; if the produced water flows through the shell side, scaling will occur on the outer wall of the tube side, and together with the action of sediment and dirty oil, blockage between the tube bundles will be caused, and the heat exchange efficiency drops significantly and it is difficult to repair. The spiral plate heat exchanger also has narrow flow channels, is easily blocked and perforated by sediment abrasion, and is basically impossible to repair. According to the research situation, these commonly used produced water heat exchangers generally cannot be used after 3 to 5 years of production. Summary of the Invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a cyclone separation heat pipe heat exchanger, which especially has the characteristics of anti-blocking, anti-corrosion, anti-scaling, high overall heat transfer coefficient, and easy maintenance, and can be applied to the heat exchange between produced water from oilfields and clean water and the heat exchange between various similar sewage and clean water.

[0005] The technical problems solved by the present invention can be achieved by adopting the following technical solutions:

[0006] A cyclone separation heat pipe heat exchanger includes a first cylinder for the heat exchange and circulation of impurity-free fluid media and a second cylinder for the heat exchange and circulation of fluid media containing impurities. The first cylinder and the second cylinder are connected by a flange partition. The first cylinder is located directly above the second cylinder. A plurality of heat pipes are arranged through the flange partition, and both ends of the plurality of heat pipes extend into the first cylinder and the second cylinder respectively. A drain pipe is arranged through the first cylinder and the flange partition. One end of the drain pipe extends into the second cylinder, and the other end extends outside the first cylinder. The outlet at the top of the drain pipe is the sewage outlet.

[0007] Further, the second cylinder body successively includes a first vertical cylinder body portion, a first conical cylinder body portion, a second vertical cylinder body portion, and a second conical cylinder body portion from top to bottom. The apertures of the first vertical cylinder body portion, the first conical cylinder body portion, the second vertical cylinder body portion, and the second conical cylinder body portion decrease successively from top to bottom. The first vertical cylinder body portion and the second vertical cylinder body portion are vertical cylinders with the same aperture at both ends. The first conical cylinder body portion and the second conical cylinder body portion are frustum-shaped cylinder bodies. The bottom opening of the second conical cylinder body portion is a sewage outlet, and a sewage inlet is provided on the first vertical cylinder body portion.

[0008] Further, a clear water outlet is provided above the side wall of the first cylinder body, a clear water inlet is provided below the side wall of the first cylinder body. A plurality of layers of baffles are successively arranged in the first cylinder body from top to bottom. Liquid flow outlets are provided between the plurality of layers of baffles and the side wall of the first cylinder body. The liquid flow outlets between the adjacent two layers of baffles and the side wall of the first cylinder body are symmetrically arranged.

[0009] Further, the clear water inlet is provided on the outer wall of the bottom space divided by the lowermost baffle of the first cylinder body, and the clear water outlet is provided on the outer wall of the top space divided by the uppermost baffle of the first cylinder body. The clear water inlet and the clear water outlet are respectively provided on the side wall of the first cylinder body on the opposite side of the liquid flow outlet.

[0010] Further, the heat pipe includes a heat pipe clear water portion and a heat pipe sewage portion. The heat pipe clear water portion and the heat pipe sewage portion are of an integral structure. The heat pipe clear water portion is located in the first cylinder body, and the heat pipe sewage portion is located in the second cylinder body. Spiral fins are arranged along the length direction on the pipe wall of the heat pipe clear water portion, and the pipe wall of the heat pipe sewage portion is a smooth pipe wall.

[0011] Further, a flange cover plate is further provided at the top of the first cylinder body. The drain pipe extends to the outside of the flange cover plate, and the flange cover plate and the top of the first cylinder body are connected by a second bolt and nut fastener.

[0012] Further, the first cylinder body, the flange partition board and the second cylinder body are connected by a first bolt and nut fastener.

[0013] Further, the sewage inlet is a tangential inlet that flows in tangentially along the side wall of the first vertical cylinder body portion.

[0014] The beneficial effects of the present invention are:

[0015] Compared with the prior art, the cyclone separation heat pipe heat exchanger of the present invention has the advantages of anti-blocking, anti-corrosion, anti-scaling, high overall heat transfer coefficient and easy maintenance.

[0016] 1. Anti-clogging: The produced water containing sediment enters the lower part of the heat exchanger from the produced water inlet. It passes through the first conical cylinder part, the second vertical cylinder part, and the second conical cylinder part in the lower part, forming a swirl in the first conical cylinder part. Under the action of centrifugal force and gravity, the sediment in the produced water sinks along the inner walls of the first conical cylinder part, the second vertical cylinder part, and the second conical cylinder part to the produced water drain port at the bottom of the second conical cylinder part and is discharged regularly. After the swirl separation, the particulate content of the produced water decreases. At the same time, the produced water drain pipe can be set with a pipe having a wide flow channel and is not easily blocked. The separated produced water is discharged from the upper sewage outlet of the heat exchanger.

[0017] 2. Anti-corrosion: The first cylinder, the second cylinder, the flange partition, the flange cover plate, the baffle, and the heat pipe can all be made of anti-corrosion materials; in particular, the materials of the first cylinder and the second cylinder of the produced water can be selected as non-metallic materials, greatly improving the anti-corrosion performance.

[0018] 3. Anti-scaling: Anti-scaling coatings can be sprayed on the inner walls of the first cylinder and the second cylinder, the flange partition, the baffle, and the heat pipe to increase the anti-scaling property of the heat pipe heat exchanger.

[0019] 4. When applying the heat pipe heat exchanger of the present invention to on-site use in practice, compared with the shell-and-tube heat exchanger with a total heat transfer coefficient of about 1500 W / m 2 ·°C, the plate heat exchanger is about 3000 W / m 2 ·°C, and the spiral plate heat exchanger is about 2500 W / m 2 ·°C. This heat exchanger uses gravity normal temperature heat pipes with high thermal conductivity, and the total heat transfer coefficient is as high as 5000 W / m 2 ·°C. Therefore, the heat pipe heat exchanger of the present invention has a high total heat transfer coefficient. Description of the Drawings

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 It is a schematic overall sectional structure diagram of the swirl separation heat pipe heat exchanger of the present invention.

[0022] Figure 2 It is a schematic A-A sectional structure diagram of the swirl separation heat pipe heat exchanger of the present invention.

[0023] Figure 3 It is a schematic B-B sectional structure diagram of the swirl separation heat pipe heat exchanger of the present invention.

[0024] In the figure: 1 - sewage inlet, 2 - clean water inlet, 3 - clean water outlet, 4 - sewage outlet, 5 - sewage discharge port, 6 - heat pipe clean water part, 7 - heat pipe sewage part, 8 - baffle plate, 9 - flange partition, 10 - sewage side housing, 11 - clean water side housing, 12 - first bolt and nut fastener, 13 - second bolt and nut fastener, 14 - flange cover plate. Specific embodiments

[0025] Next, the technical solution of the cyclone separation heat pipe heat exchanger provided by the embodiments of the present invention will be introduced and described in detail through several specific embodiments.

[0026] Referring to Figure 1 As shown, a cyclone separation heat pipe heat exchanger includes a first cylinder for heat exchange and circulation of impurity-free fluid medium and a second cylinder for heat exchange and circulation of fluid medium containing impurities. The first cylinder and the second cylinder of the present invention are both vertically arranged. The first cylinder and the second cylinder are connected by a flange partition 9. The flange partition 9 separates the internal spaces of the first cylinder and the second cylinder. The first cylinder is located directly above the second cylinder. A plurality of heat pipes are arranged through the flange partition 9. Both ends of the plurality of heat pipes extend into the first cylinder and the second cylinder respectively. The plurality of heat pipes are all of an integral structure, evenly distributed on the flange partition 9 and penetrate through the flange partition 9. A drain pipe is arranged through the first cylinder and the flange partition 9. One end of the drain pipe extends into the second cylinder and the other end extends outside the first cylinder. The outlet at the top of the drain pipe is the sewage outlet 4.

[0027] The heat exchange principle of the present invention is that the fluid medium containing impurities with heat at the lower part enters the second cylinder, and then the heat is transferred to the first cylinder through the heat pipes. The impurity-free fluid medium in the first cylinder takes out the heat by flowing in and out. The bottom of the second cylinder is used to collect the impurities in the fluid medium containing impurities. The liquid after depositing the impurities is discharged from the sewage outlet 4 at the top of the first cylinder through the drain pipe.

[0028] The cyclone separation heat pipe heat exchanger of the present invention is applicable to the waste heat recovery of oilfield produced water and the heat exchange of sewage source heat pump. In the following embodiments, the impurity-free fluid medium of the present invention is clean water, and the fluid medium containing impurities is sewage.

[0029] Referring to Figure 1As shown in the figure, the second cylinder body sequentially includes a first vertical cylinder body part, a first conical cylinder body part, a second vertical cylinder body part, and a second conical cylinder body part from top to bottom. The apertures of the first vertical cylinder body part, the first conical cylinder body part, the second vertical cylinder body part, and the second conical cylinder body part decrease sequentially from top to bottom. That is, the diameter of the first vertical cylinder body part is the same as the diameter of the large-diameter end of the first conical cylinder body part. The diameter of the small-diameter end of the first conical cylinder body part is the same as the diameter of the second vertical cylinder body part. The diameter of the large-diameter end of the second conical cylinder body part is the same as the diameter of the second vertical cylinder body part. The first vertical cylinder body part and the second vertical cylinder body part are vertical cylinder bodies with the same aperture at both ends. The first conical cylinder body part and the second conical cylinder body part are frustum-shaped cylinder bodies. The bottom opening of the second conical cylinder body part is a sewage outlet 5. A sewage inlet 1 is provided on the first vertical cylinder body part. Refer to Figure 3 As shown in the figure, the sewage inlet 1 is a tangential inlet that flows into the side wall of the first vertical cylinder body part tangentially. When the sewage enters from the sewage inlet 1, it will rotate at a high speed along the inner wall of the vertical cylinder body second. The impurities will move downward, and the liquid will be discharged from the sewage outlet 4 at the top through the drain pipe. The impurities enter the first conical cylinder body part and move downward, and then enter the second vertical cylinder body part and directly fall into the second conical cylinder body part for sedimentation. The liquid will also rotate when it is in the first conical cylinder body part. When passing through the second vertical cylinder body part, the impurities located in the second conical cylinder body part will not rotate with the liquid anymore, thus realizing the separation of impurities and liquid.

[0030] In the heat exchanger of the present invention for the waste heat recovery of oilfield produced water, the produced water containing sediment enters the lower half of the heat exchanger from the sewage inlet 1. Through the first conical cylinder body part, the second vertical cylinder body part, and the second conical cylinder body part in the lower half, a swirling flow is formed in the conical structure. The sediment in the produced water sinks along the outer wall of the cone to the bottom of the cone of the produced water sewage outlet 5 under the action of centrifugal force and gravity and is discharged regularly. After the swirling separation, the particulate matter content of the produced water decreases. At the same time, the drain pipe of the produced water can be set with a pipe having a wide flow channel and is not easy to form blockage. The separated produced water is discharged from the sewage outlet 4 at the upper part of the heat exchanger.

[0031] Refer to Figure 1 As shown in the figure, a clear water outlet 3 is provided above the side wall of the first cylinder body, and a clear water inlet 2 is provided below the side wall of the first cylinder body. Let the clear water flow out from bottom to top, which increases the heat exchange time and can conduct sufficient contact heat exchange. A plurality of layers of baffles 8 are sequentially arranged in the first cylinder body from top to bottom. The plurality of layers of baffles 8 divide the first cylinder body into multiple spaces, which is also to let the clear water enter the multiple spaces for sufficient heat exchange. A liquid flow outlet is provided between the plurality of layers of baffles 8 and the side wall of the first cylinder body. The clear water in the lower layer can flow into the space on the upper side for heat exchange. The liquid flow outlets between the baffles 8 of adjacent two layers and the side wall of the first cylinder body are symmetrically arranged, so that the liquid forms a zigzag flow and flows out along the S route, thereby increasing the heat exchange time.

[0032] The clean water inlet 2 is provided on the outer wall of the bottom space divided by the lowermost baffle 8 in the first cylinder, and the clean water outlet 3 is provided on the outer wall of the top space divided by the uppermost baffle 8 in the first cylinder. The clean water inlet 2 and the clean water outlet 3 are respectively provided on the side wall of the first cylinder on the opposite side of the liquid flow outlet, so that the clean water can flow upward from the bottom, increasing the contact time between the clean water and the heat pipe and enabling sufficient heat exchange.

[0033] Refer to Figure 1 、 Figure 2 and Figure 3 As shown, the heat pipe includes a heat pipe clean water part 6 and a heat pipe sewage part 7. The heat pipe clean water part 6 and the heat pipe sewage part 7 are of an integral structure, that is, a connected heat pipe, which is divided into upper and lower parts. The heat pipe clean water part 6 is located inside the first cylinder, and the heat pipe sewage part 7 is located inside the second cylinder. Spiral fins are arranged along the length direction on the pipe wall of the heat pipe clean water part 6, aiming to increase the heat dissipation area, and at the same time increase the contact area with the clean water and increase the heat exchange amount. The pipe wall of the heat pipe sewage part 7 is a smooth pipe wall, aiming to prevent impurities in the sewage from adhering to the heat pipe and causing blockage.

[0034] Refer to Figure 1 As shown, a flange cover plate 14 is also provided at the top of the first cylinder. The top of the first cylinder is closed through the flange cover plate 14 to form a sealed space for treating the leaching liquid inlet for sufficient heat exchange, avoiding heat loss and water evaporation. The drain pipe extends outside the flange cover plate 14, aiming to prevent the sewage from polluting the clean water. The flange cover plate 14 and the top of the first cylinder are connected by a second bolt and nut fastener 13, making the connection more firm.

[0035] Refer to Figure 1 As shown, the first cylinder, the flange partition 9 and the second cylinder are connected by a first bolt and nut fastener 12, making the connection more firm, extending the service life, and at the same time being convenient for installation or disassembly and easy for maintenance.

[0036] In the present invention, the first cylinder, the second cylinder, the flange partition 9, the flange cover plate 14, the baffle 8 and the heat pipe can all be made of corrosion-resistant materials; especially for the first cylinder and the second cylinder of the produced water, non-metallic materials can be selected, greatly improving the corrosion resistance.

[0037] Furthermore, the second cylinder and the flange partition 9 can be made of non-metallic materials or metal materials with a plastic lining inside or corrosion-resistant metal materials to improve the corrosion resistance of the sewage side structure; the first cylinder and the flange cover plate 14 can be made of metal materials or non-metal materials, saving the manufacturing cost of the heat exchanger and having a long service life at the same time.

[0038] Among them, an anti-scaling coating can be sprayed on the inner walls of the first cylinder and the second cylinder, the flange partition 9, the baffle 8 and the heat pipe to increase the anti-scaling property of the heat pipe heat exchanger.

[0039] When the heat pipe heat exchanger of the present invention is applied to on-site use, compared with a shell-and-tube heat exchanger, the overall heat transfer coefficient is about 1500 W / m 2 ·°C, and for a plate heat exchanger it is about 3000 W / m 2 ·°C, and for a spiral plate heat exchanger it is about 2500 W / m 2 ·°C. This heat exchanger uses gravity normal-temperature heat pipes with high thermal conductivity, and the overall heat transfer coefficient is as high as 5000 W / m 2 ·°C. Therefore, the heat pipe heat exchanger of the present invention has a high overall heat transfer coefficient.

[0040] The embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the spirit of the present invention, and all of them are within the scope of protection of this technology.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0042] The technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A cyclone separation heat pipe heat exchanger, characterized in that: It includes a first cylinder body for the heat exchange and flow of impurity-free fluid medium and a second cylinder body for the heat exchange and flow of fluid medium containing impurities. The first cylinder body and the second cylinder body are connected by a flange partition plate (9). The first cylinder body is located directly above the second cylinder body. A number of heat pipes are arranged through the flange partition plate (9). Both ends of the number of heat pipes extend into the first cylinder body and the second cylinder body respectively. A drain pipe is arranged through the first cylinder body and the flange partition plate (9). One end of the drain pipe extends into the second cylinder body, and the other end extends outside the first cylinder body. The outlet at the top of the drain pipe is the sewage outlet (4).

2. The swirl separation heat pipe heat exchanger according to claim 1, characterized in that: The second cylinder body successively includes a first vertical cylinder part, a first conical cylinder part, a second vertical cylinder part and a second conical cylinder part from top to bottom. The first vertical cylinder part and the second vertical cylinder part are vertical cylinders with the same aperture at both ends. The first conical cylinder part and the second conical cylinder part are frustum-shaped cylinder bodies. The diameter of the first vertical cylinder part is the same as the diameter of the large-diameter end of the first conical cylinder part. The diameter of the small-diameter end of the first conical cylinder part is the same as the diameter of the second vertical cylinder part. The diameter of the large-diameter end of the second conical cylinder part is the same as the diameter of the second vertical cylinder part. The bottom opening of the second conical cylinder part is the sewage discharge port (5), and a sewage inlet (1) is arranged on the first vertical cylinder part.

3. The swirl separation heat pipe heat exchanger according to claim 1 or 2, characterized in that: A clear water outlet (3) is arranged above the side wall of the first cylinder body, and a clear water inlet (2) is arranged below the side wall of the first cylinder body. A plurality of layers of baffle plates (8) are successively arranged in the first cylinder body from top to bottom. A liquid flow outlet is arranged between the plurality of layers of baffle plates (8) and the side wall of the first cylinder body. The liquid flow outlets between the adjacent two layers of baffle plates (8) and the side wall of the first cylinder body are arranged in a vertically offset manner on the opposite sides.

4. The swirl separation heat pipe heat exchanger according to claim 3, characterized in that: The clear water inlet (2) is arranged on the outer wall of the bottom space divided by the lowermost baffle plate (8) of the first cylinder body, and the clear water outlet (3) is arranged on the outer wall of the top space divided by the uppermost baffle plate (8) of the first cylinder body.

5. The swirl separation heat pipe heat exchanger according to claim 4, characterized in that: The heat pipe includes a heat pipe clear water part (6) and a heat pipe sewage part (7). The heat pipe clear water part (6) and the heat pipe sewage part (7) are of an integral structure. The heat pipe clear water part (6) is located in the first cylinder body, and the heat pipe sewage part (7) is located in the second cylinder body. Spiral fins are arranged along the length direction on the pipe wall of the heat pipe clear water part (6), and the pipe wall of the heat pipe sewage part (7) is a smooth pipe wall.

6. The swirl separation heat pipe heat exchanger according to claim 1, characterized in that: A flange cover plate (14) is further arranged at the top of the first cylinder body. The drain pipe extends outside the flange cover plate (14). The flange cover plate (14) is connected to the top of the first cylinder body by a second bolt and nut fastener (13).

7. The swirl separation heat pipe heat exchanger according to claim 1, characterized in that: The first cylinder body, the flange partition plate (9) and the second cylinder body are connected by a first bolt and nut fastener (12).

8. The swirl separation heat pipe heat exchanger according to claim 2, characterized in that: The sewage inlet (1) is a tangential inlet that flows in tangentially along the side wall of the first vertical cylinder part.

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