Flue gas waste heat recovery device for oilfield combination station

Abstract

The utility model belongs to heat exchange technical field relates to a flue gas waste heat recovery device for oilfield joint station, including the flue gas cover, be equipped with the flue gas cover and go into the smoke pipe, the smoke pipe, the cold water pipe, the hot water pipe and set up in the inside heat exchanger of flue gas cover, the water inlet of heat exchanger is fixedly connected with the hose no.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchange technology and relates to a waste heat recovery device for flue gas used in oilfield joint stations. Background Technology

[0002] The flue gas waste heat recovery device recovers waste heat from flue gas through a heat exchanger, heating cold water into hot water. The produced hot water can be directly used for crude oil dehydration heating, gathering and transmission pipeline heating, and preheating of domestic water in the station, thereby reducing the load on the main heating equipment, reducing fuel consumption, and achieving energy recycling and environmental emission reduction. However, the flue gas in the oilfield joint station not only contains dust but also oil and gas impurities volatilized from crude oil. These impurities easily form sticky dust on the heat exchange surface of the heat exchanger. After long-term operation, they will condense into a dense fouling layer. The fouling layer will reduce the thermal conductivity of the metal heat exchanger, weaken the heat exchange efficiency, and lead to a decrease in waste heat recovery. If the dust blocks the heat exchange channel of the heat exchanger, it will increase the flow resistance of the flue gas, causing poor exhaust of the upstream combustion equipment, affecting combustion efficiency, and in severe cases, requiring shutdown for cleaning. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a waste heat recovery device for flue gas in oilfield joint stations.

[0004] The waste heat recovery device for flue gas in an oilfield joint station according to this utility model includes a flue gas hood, which is equipped with an inlet pipe, an outlet pipe, a cold water pipe, a hot water pipe, and a heat exchanger installed inside the flue gas hood. A first hose fixedly connected to the cold water pipe is installed at the water inlet end of the heat exchanger, and a second hose fixedly connected to the hot water pipe is installed at the water outlet end of the heat exchanger. A dust blowing unit is installed inside the flue gas hood, a dust loosening unit is installed outside the flue gas hood, and a dust removal unit is installed inside the flue gas hood. The dust blowing unit includes an arc tube adapted to the heat exchanger, and multiple air nozzles are provided on the arc tube. Each air nozzle is connected to a spring tube that passes through the flue hood through the arc tube. The dust removal unit includes four pneumatic push rods fixedly installed on the flue hood, and the working end of each pneumatic push rod is fixedly connected to one end surface of the heat exchanger. The dust removal unit includes two water pipes (three) respectively installed at both ends of the bottom of the flue hood and a water pipe (one) fixedly connected to a cold water pipe. The water pipe (one) is connected to the two water pipes (three) through a water pipe (two). The outer surface of each water pipe (three) is provided with multiple water nozzles. A solenoid valve corresponding to the drain outlet is fixedly installed at the bottom of the flue hood.

[0005] A servo motor is fixedly installed on the flue gas hood. A gear one is fixedly installed on the working end of the servo motor. Gear one meshes with gear two. Gear two is fixedly connected to a threaded rod that is rotatably connected inside the flue gas hood. Sealing rotating shaft one and sealing rotating shaft two are rotatably connected to the two ends of the threaded rod, respectively. A slider one is threadedly connected to the threaded rod. An arc tube is fixedly connected to slider one. Two sliding rods are provided inside the flue gas hood. A slider two that matches the sliding rods is fixedly connected to the arc tube.

[0006] The fume hood is equipped with a protective shell that is compatible with gear one and gear two.

[0007] The flue hood is equipped with a sealing sliding shaft corresponding to a pneumatic push rod. A gasket is welded to one end of each sealing sliding shaft. A housing is fixedly connected to the gasket. A spring is installed inside the housing. A moving rod is slidably connected inside the sealing sliding shaft. A top plate is slidably connected inside the housing and fixedly connected to the moving rod. One end of each of the four moving rods is fixedly connected to the other side surface of the heat exchanger.

[0008] The fume hood is equipped with support legs at the bottom.

[0009] The bottom of the flue hood is recessed towards the center, and the solenoid valve corresponding to the drain outlet is located at the center of the recess.

[0010] The water nozzle is tilted downwards at 30°.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention utilizes a pneumatic push rod and spring to drive the heat exchanger to generate high-frequency vibration, which can shake away sticky dust and dense dirt adhering to the heat exchange surface. Then, by cooperating with an external air pump, a high-pressure airflow is delivered through a high-temperature resistant spring tube and an air nozzle to blow away the dust. No downtime or disassembly is required, which can avoid the decrease in heat exchange efficiency caused by the formation of dirt layers and reduce equipment operation and maintenance time. After being blown away, the dust naturally settles and collects in the recessed area, preventing the dust from scattering inside the enclosure and causing secondary pollution. At the same time, the water supply comes directly from the device's own cold water pipe, which mixes the dust with water to form an easily discharged slurry, which is then discharged. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural schematic diagram of a fume hood according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the overall smoke outlet pipe structure according to an embodiment of this utility model. Figure 3 This is a schematic diagram of the overall smoke inlet pipe structure according to an embodiment of this utility model. Figure 4 This is a schematic diagram of the internal structure of a smoke hood according to an embodiment of the present invention; Figure 5This is a cross-sectional structural diagram of the housing and sealing sliding shaft according to an embodiment of the present invention.

[0013] In the picture: 1. Smoke hood; 2. Supporting leg; 3. Smoke inlet pipe; 4. Smoke outlet pipe; 5. Cold water pipe; 6. Heat exchanger; 7. Hot water pipe; 8. Dust blowing unit; 801. Servo motor; 802. Gear 1; 803. Gear 2; 804. Sealing rotating shaft 1; 805. Threaded rod; 806. Sealing rotating shaft 2; 807. Slider 1; 808. Arc tube; 809. Air nozzle; 810. Slider 2; 811. Slide rod; 812. Protective shell; 813. Bourdon tube; 9. Dust loosening unit; 901. Pneumatic push rod; 902. Housing; 903. Spring; 904. Gasket; 905. Sealing sliding shaft; 906. Top plate; 907. Moving rod; 10. Dust removal unit; 101. Water pipe one; 102. Water pipe two; 103. Water pipe three; 104. Water tap; 105. Solenoid valve; 11. Hose 1; 12. Hose 2. Detailed Implementation

[0014] Example 1 like Figures 1-5 As shown, the waste heat recovery device for flue gas in an oilfield joint station according to this utility model includes a flue gas hood 1. The flue gas hood 1 is equipped with an inlet pipe 3, an outlet pipe 4, a cold water pipe 5, a hot water pipe 7, and a heat exchanger 6 installed inside the flue gas hood 1. A hose 11 fixedly connected to the cold water pipe 5 is installed at the water inlet end of the heat exchanger 6, and a hose 12 fixedly connected to the hot water pipe 7 is installed at the water outlet end of the heat exchanger 6. A dust blowing unit 8 is installed inside the flue gas hood 1, and a dust blowing unit 8 is installed on the outside of the flue gas hood 1. There is a dust removal unit 9, and the inside of the fume hood 1 is equipped with a dust removal unit 10. Water is pumped out by an external water pump, and cold water can be passed through cold water pipe 5 and hose 11 to enter the heat exchanger 6 for heat exchange. The cold water is converted into hot water through heat exchange, and the hot water flows out through hose 2 12 and hot water pipe 7 for use. The flue gas enters the fume hood 1 through the smoke inlet pipe 3 and exchanges heat with the heat exchanger 6, and then is discharged through the smoke outlet pipe 4. Hose 11 and hose 2 12 are made of silicone tubes that can withstand high temperature and are heat-insulated. The dust blowing unit 8 includes an arc tube 808 adapted to the heat exchanger 6. The arc tube 808 is provided with multiple air nozzles 809. Each air nozzle 809 is connected to a spring tube 813 that passes through the fume hood 1 through the arc tube 808. An external air pump is connected to the air inlet end of the spring tube 813. The gas generated by the air pump can enter the arc tube 808 from the spring tube 813 and then be sprayed out from the multiple threaded air nozzles 809 on the arc tube 808. This can blow away the dust accumulated on the outer surface of the heat exchanger 6, thereby preventing the dust from accumulating into thick dirt and affecting heat exchange. The spring tube 813 is made of silicone tube that can withstand high temperature and provide heat insulation. The dust loosening unit 9 includes four pneumatic push rods 901 fixedly installed on the flue hood 1. The working end of each pneumatic push rod 901 is fixedly connected to one end surface of the heat exchanger 6. The working end of the pneumatic push rod 901 is coated with a high-temperature resistant heat insulation coating. The first hose 11 and the second hose 12 make the heat exchanger 6 flexibly connected. The four pneumatic push rods 901 can reciprocate to push the heat exchanger 6 to vibrate, thereby loosening the dust accumulated on the surface of the heat exchanger 6, which is convenient for the dust blowing unit 8 to blow the dust. The dust removal unit 10 includes two water pipes 103 at both ends of the bottom of the flue hood 1 and a water pipe 101 fixedly connected to the cold water pipe 5. The water pipe 101 is connected to the two water pipes 103 through the water pipe 2 102. The outer surface of the water pipes 103 is provided with multiple water nozzles 104. A solenoid valve 105 corresponding to the drain outlet is fixedly installed at the bottom of the flue hood 1. Part of the dust that is shaken and blown away is discharged through the smoke outlet pipe 4, and the other part falls into the lower surface of the inside of the flue hood 1. The water pipe 101 is supplied with water by the cold water pipe 5. The water source is controlled by the control valve to close and open the water source. When too much dust accumulates on the lower surface of the inside of the flue hood 1, the control valve opens, and the water source in the cold water pipe 5 enters the water pipe 2 102 through the water pipe 101, and then enters the two water pipes 103 through the water pipe 2 102, and is sprayed out by the water nozzles 104 to clean the dust.

[0015] A servo motor 801 is fixedly installed on the flue hood 1. A gear 802 is fixedly installed on the working end of the servo motor 801. Gear 802 meshes with gear 803. Gear 803 is fixedly connected to a threaded rod 805 rotatably connected inside the flue hood 1. Sealing rotating shaft 804 and sealing rotating shaft 806 are rotatably connected to both ends of the threaded rod 805, respectively. A slider 807 is threadedly connected to the threaded rod 805. An arc tube 808 is fixedly connected to slider 807. Two sliding rods 811 are provided inside the flue hood 1. A slider 810 adapted to the sliding rods 811 is fixedly connected to the arc tube 808. Powered by an external power source, 801 drives gear 802 to rotate. Gear 802 meshes with gear 803, causing gear 803 to rotate. Gear 803 is fixedly connected to threaded rod 805, causing threaded rod 805 to rotate. Slider 807 is threadedly connected to threaded rod 805, causing slider 807 to drive arc tube 808 to slide inside flue hood 1. This allows nozzle 809 to perform large-area air blowing cleaning on heat exchanger 6. Sealing rotating shaft 804 and sealing rotating shaft 806 ensure that threaded rod 805 rotates stably while maintaining a tight seal.

[0016] The fume hood 1 is provided with a protective shell 812 that is compatible with gear 1 802 and gear 2 803. The protective shell 812 plays a protective role when gear 1 802 and gear 2 803 mesh and rotate.

[0017] The fume hood 1 is equipped with sealing sliding shafts 905 corresponding to the pneumatic push rods 901. One end of each sealing sliding shaft 905 is welded to a gasket 904. A housing 902 is fixedly connected to the gasket 904. A spring 903 is installed inside the housing 902. A moving rod 907 is slidably connected inside the sealing sliding shaft 905. A top plate 906, which is fixedly connected to the moving rod 907, is slidably connected inside the housing 902. One end of each of the four moving rods 907 is fixedly connected to the other side surface of the heat exchanger 6. When the four pneumatic push rods 901 push the heat exchanger 6, the moving rod 907 connected to the other side surface of the heat exchanger 6 will slide in the housing 902 by pushing the top plate 906, thereby compressing the spring 903. When the four pneumatic push rods 901 return to their original position, the spring 903 will return to its original position due to elastic potential energy. This, together with the four pneumatic push rods 901, achieves vibration and buffering effects, generating instantaneous vibration force, thereby loosening the dust adhering to the heat exchanger 6. The sealing sliding shaft 905 ensures that the moving rod 907 does not affect the sealing performance while sliding, and the gasket 904 serves to limit and seal.

[0018] The bottom of the smoke hood 1 is provided with support legs 2.

[0019] The bottom of the fume hood 1 is recessed towards the center, and the solenoid valve 105 corresponding to the drain outlet is located at the center of the recess. The mixture of water and dust flows into the center, and the water and dust are discharged by opening the solenoid valve 105.

[0020] The water nozzle 104 is tilted downwards at 30°.

[0021] Working process or working principle: To prevent dust and scale buildup on the surface of heat exchanger 6 from affecting heat exchange efficiency, the device first loosens the accumulated dust using a dust loosening unit 9. Heat exchanger 6 is flexibly connected via flexible hoses 11 and 12. A pneumatic push rod 901 drives heat exchanger 6 in reciprocating motion. Simultaneously, a moving rod 907 connected to the other end of heat exchanger 6 moves with it, pushing the top plate 906 inside housing 902 to compress spring 903. When the pneumatic push rod 901 returns to its original position, spring 903... The elastic potential energy drives the top plate 906, moving rod 907, and heat exchanger 6 to reverse and reset, forming an instantaneous vibration that disperses the dust adhering to the surface of the heat exchanger 6, preparing for subsequent dust removal. After the dust removal operation is completed, an external air pump supplies air to the arc tube 808 through a high-temperature resistant and heat-insulating silicone spring tube 813. The gas is sprayed out through multiple air nozzles 809 on the surface of the arc tube 808, directly acting on the surface of the heat exchanger 6. To achieve comprehensive cleaning, the servo motor 801 above the fume hood 1 drives the gear 1 802 to rotate. The gear 1 802 meshes with the gear 2 803, thereby driving the threaded rod 805, which passes through the sealing rotating shaft 1 804 and the sealing rotating shaft 2 806, to rotate. The slider 1 807, which is threadedly connected to the threaded rod 805, slides laterally as the threaded rod 805 rotates. At the same time, the arc tube 808 is stably guided by the two outer sliders 2 810 on the slide rod 811 inside the fume hood 1, so that the air nozzles 809 can blow air over a large area of ​​the surface of the heat exchanger 6, thoroughly cleaning it. Besides loose dust, some of the blown-out dust is discharged with the flue gas from the exhaust pipe 4, while the rest settles inside the lower part of the fume hood 1. When there is a lot of dust accumulated in the recessed area, the control valve of water pipe 101 is opened. Cold water from cold water pipe 5 enters water pipe 2 102 inside the fume hood 1 through water pipe 101, and then flows to two water pipes 3 103. The water nozzles 104 on the surface of water pipes 3 103 are set at a downward tilt of 30 degrees, which can accurately spray water into the recessed area, mixing the dust and water to form a slurry. Finally, the slurry is guided by the recessed structure to converge in the lower middle part of the fume hood 1. Opening the solenoid valve 105 here will discharge the slurry, completing the entire dust removal process.

[0022] This invention utilizes a pneumatic push rod 901 and a spring 903 to drive the heat exchanger 6 to generate high-frequency vibration, which can shake away the sticky dust and dense dirt adhering to the heat exchange surface. Then, in conjunction with an external air pump, a high-pressure airflow is delivered through a high-temperature resistant spring tube 813 and an air nozzle 809 to blow away the dust. This eliminates the need for machine shutdown and disassembly, thus avoiding the decrease in heat exchange efficiency caused by the formation of a dirt layer and reducing equipment maintenance time. After being blown away, the dust naturally settles and gathers in the recessed area, preventing the dust from scattering inside the enclosure and causing secondary pollution. At the same time, the water supply comes directly from the device's own cold water pipe 5, which mixes the dust with water to form an easily discharged slurry, which is then discharged.

[0023] The descriptions of the orientation and relative positional relationships of the structure in this utility model, such as descriptions of front, back, left, right, up, and down, do not constitute a limitation on this utility model, but are merely for the convenience of description.

Claims

1. A waste heat recovery device for flue gas used in an oilfield combined station, characterized in that: Includes a fume hood (1), which is equipped with an inlet pipe (3), an outlet pipe (4), a cold water pipe (5), a hot water pipe (7), and a heat exchanger (6) installed inside the fume hood (1). The inlet end of the heat exchanger (6) is fixedly connected to a hose one (11) that is fixedly connected to the cold water pipe (5), and the outlet end of the heat exchanger (6) is fixedly connected to a hose two (12) that is fixedly connected to the hot water pipe (7). The inside of the fume hood (1) is equipped with a dust blowing unit (8), the outside of the fume hood (1) is equipped with a dust loosening unit (9), and the inside of the fume hood (1) is equipped with a dust removal unit (10). The dust blowing unit (8) includes an arc tube (808) adapted to the heat exchanger (6), and multiple air nozzles (809) are provided on the arc tube (808). Each air nozzle (809) is connected to a spring tube (813) that passes through the smoke hood (1) through the arc tube (808). The dust removal unit (9) includes four pneumatic push rods (901) fixedly connected to the flue gas hood (1), and the working end of each pneumatic push rod (901) is fixedly connected to one end surface of the heat exchanger (6). The dust removal unit (10) includes two water pipes (103) respectively installed at both ends of the bottom of the flue hood (1) and a water pipe (101) fixedly connected to the cold water pipe (5). The water pipe (101) is connected to the two water pipes (103) through the water pipe (2) (102). The outer surface of the water pipes (103) is provided with multiple water nozzles (104). The bottom of the flue hood (1) is fixedly connected with a solenoid valve (105) corresponding to the drain outlet.

2. The waste heat recovery device for flue gas in an oilfield joint station according to claim 1, characterized in that: A servo motor (801) is fixedly connected to the smoke hood (1). A gear 1 (802) is fixedly connected to the working end of the servo motor (801). A gear 2 (803) is meshed with the gear 1 (802). A threaded rod (805) is fixedly connected to the gear 2 (803) and rotatably connected inside the smoke hood (1). A sealing rotating shaft 1 (804) and a sealing rotating shaft 2 (806) are rotatably connected to both ends of the threaded rod (805). A slider 1 (807) is threadedly connected to the threaded rod (805). An arc tube (808) is fixedly connected to the slider 1 (807). Two sliding rods (811) are provided inside the smoke hood (1). A slider 2 (810) that is compatible with the sliding rods (811) is fixedly connected to the arc tube (808).

3. The waste heat recovery device for flue gas in an oilfield joint station according to claim 2, characterized in that: The smoke hood (1) is provided with a protective shell (812) that is compatible with gear one (802) and gear two (803).

4. The waste heat recovery device for flue gas in an oilfield joint station according to claim 3, characterized in that: The flue gas hood (1) is provided with a sealing sliding shaft (905) corresponding to the pneumatic push rod (901). A gasket (904) is welded to one end of each sealing sliding shaft (905). A housing (902) is fixedly connected to the gasket (904). A spring (903) is provided inside the housing (902). A moving rod (907) is slidably connected inside the sealing sliding shaft (905). A top piece (906) is slidably connected inside the housing (902) and fixedly connected to the moving rod (907). One end of each of the four moving rods (907) is fixedly connected to the other side surface of the heat exchanger (6).

5. The waste heat recovery device for flue gas in an oilfield combined station according to claim 4, characterized in that: The bottom of the smoke hood (1) is provided with a support leg (2).

6. The waste heat recovery device for flue gas in an oilfield joint station according to claim 5, characterized in that: The bottom of the flue gas hood (1) is recessed towards the center, and the solenoid valve (105) corresponding to the drain outlet is located at the center of the recess.

7. The waste heat recovery device for flue gas in an oilfield combined station according to claim 6, characterized in that: The water tap (104) is set to tilt downward at 30°.

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