Electrode type phase change heating buffer online descaling device

Abstract

The invention relates to an electrode type phase change heating buffer online descaling device. The problems that an existing heating furnace is low in heat efficiency and not suitable for high-power equipment are mainly solved. The device is characterized in that the upper portion of a shell of the heat exchanger (6) is connected with the electrode type steam generator (1) through the steam pipeline (3), and the lower portion of the shell of the heat exchanger (6) is connected with the electrode type steam generator (1) through the water return pipeline (7); a heat exchange pipe outlet in the heat exchanger (6) is connected with the buffer tank (4), and a descaling device (5) is arranged in the heat exchanger (6) and used for removing dirt on the inner wall of a heat exchange pipe. The electrode type phase-change heating buffering online descaling device has a buffering function and a heat exchange pipe online descaling function, is high in heat efficiency, is suitable for various oil field media and processes such as crude oil, sewage and clear water, and meanwhile enables an oil field heating furnace to achieve clean heat exchange.

Description

Technical Field

[0001] The invention relates to the field of oilfield surface engineering equipment, in particular to an electrode type phase change heating buffer online descaling device. Background Art

[0002] At present, electric heating furnaces in the domestic market are mainly used in industrial and civil heating systems. The heating equipment currently used in oil fields is mainly fuel oil and gas heating furnaces. Fuel oil and gas heating furnaces transfer heat to the medium through combustion. During the operation, they consume a large amount of fossil fuels and produce flue gas emissions. The thermal efficiency is low and does not meet the strategic needs of low-carbon environmental protection. Some equipment also uses resistive or electromagnetic heating methods. These two heating methods are determined by their principles and are limited in high-power applications. Electrode heating furnaces have not yet been applied in the field of oil and gas gathering and transportation in oil fields. Because of their high requirements for water quality, the application of electrode heating furnaces in oil fields needs to solve the problem of adaptability of electrode heating furnaces to oil and gas gathering and transportation processes. Summary of the invention

[0003] In order to overcome the shortcomings of existing heating furnaces with low thermal efficiency and unsuitability for high-power equipment application, the present invention provides an electrode-type phase-change heating buffer online descaling device. The electrode-type phase-change heating buffer online descaling device has a buffering function and an online descaling function for heat exchange tubes, has high thermal efficiency, is suitable for various oilfield media and processes such as crude oil, sewage, and clean water, and enables the oilfield heating furnace to achieve clean heat exchange.

[0004] The technical solution of the present invention is: an electrode-type phase change heating buffer online descaling device, comprising a heat exchanger, wherein the upper part of the heat exchanger shell is connected to the electrode-type steam generator through a steam pipe, and the lower part of the heat exchanger shell is connected to the electrode-type steam generator through a return water pipe; the heat exchange tube outlet inside the heat exchanger is connected to the buffer tank, and a descaling device is provided inside the heat exchanger, which is used to remove dirt on the inner wall of the heat exchange tube.

[0005] The electrode type steam generator is connected to a pure water device.

[0006] The electrode steam generator, the pure water device and the heat exchanger are all fixed on the skid-mounted base.

[0007] The descaling device comprises a descaling element, which is located in a heat exchange tube of a heat exchanger. An end of the descaling element is connected to a push-pull plate, and the push-pull plate is connected to a reducer through a transmission mechanism.

[0008] The transmission mechanism comprises a transmission gear, which is connected to the output shaft of the reducer, a lead screw is connected to the transmission gear, and a transmission nut matched with the lead screw is fixed on the push-pull plate.

[0009] The output shaft of the reducer is connected to a transmission shaft, the transmission gear is connected to the transmission shaft, and the transmission shaft is connected to a transmission mechanism frame through a shaft sleeve.

[0010] The heat exchanger comprises a shell and an end cover, the shell and the end cover are connected by bolts, the heat exchange tube is located in the shell, and the transmission mechanism frame is fixed on the end cover.

[0011] The end cover is provided with a displacement sensor for determining the starting and ending positions of the reciprocating stroke of the push-pull plate.

[0012] The present invention has the following beneficial effects: due to the adoption of the above scheme, the present invention adopts an electrode steam generator instead of a fossil fuel burner, which has a higher thermal efficiency than a traditional heating furnace and can reach more than 98%, and does not generate carbon emissions during operation, reducing the amount of fuel used in the gathering and transportation process; the electrode phase change heat transfer technology is mainly based on condensation heat transfer, releasing the latent heat of vaporization of water vapor, and has a high heat transfer coefficient; the online descaling heat exchanger can continuously clean the solid matter and dirt on the inner wall of the heat exchange tube, extending the cleaning cycle of the heating furnace; the equipment is integrally skided, with a reasonable layout and compact structure, and on-site installation only requires connecting pipes and cables; the present invention is suitable for various oilfield media and processes such as crude oil, sewage, and clean water, and at the same time achieves the goals of energy conservation, emission reduction, and low-carbon environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of a descaling device.

[0014] In the figure, 1-electrode steam generator, 2-pure water device, 3-steam pipe, 4-medium buffer tank, 5-de-scaling device, 6-heat exchanger, 7-return pipe, 8-skid base, 51-reducer, 52-transmission shaft, 53-displacement sensor, 54-transmission mechanism frame, 55-transmission gear, 56-screw, 57-transmission nut, 58-push plate, 59-connecting rod, 60-de-scaling element. Implementation

[0015] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figure 1 , Figure 2As shown, an electrode-type phase-change heating buffer online descaling device includes a heat exchanger 6, the upper part of the heat exchanger 6 shell is connected to a steam pipe 3, and the other end of the steam pipe 3 is connected to an electrode-type steam generator 1; the lower part of the heat exchanger 6 shell is connected to the electrode-type steam generator 1 through a return water pipe 7, and the steam generator 1 is connected to a pure water device 2. A heat exchange tube is provided inside the heat exchanger 6, and the outlet of the heat exchange tube is connected to a buffer tank 4, and the heated medium in the heat exchange tube enters the buffer tank 4. A descaling device 5 is provided inside the heat exchanger 6, and the descaling device 5 is used to remove dirt on the inner wall of the heat exchanger tube. The heat exchanger 6 includes a shell 61 and an end cover 62, and the shell 61 and the end cover 62 are connected by bolts, and the heat exchange tube is located in the shell 61. The electrode-type steam generator 1 and the pure water device 2 are fixed on a skid-mounted base 8, and a bracket is provided at the bottom of the heat exchanger 6, and the bracket is fixed on the skid-mounted base 8.

[0016] The descaling device 5 includes a transmission mechanism and a descaling element 60. The descaling element 60 is located in the heat exchange tube of the heat exchanger 6. Each heat exchange tube is provided with a descaling element 60. The end of the descaling element 60 is connected to the push-pull plate 58. The push-pull plate 58 is connected to the reducer 51 through the transmission mechanism. The reducer 51 is connected to the motor to drive the descaling element 60 to reciprocate, thereby removing the dirt in the heat exchange tube.

[0017] The transmission mechanism includes a transmission mechanism frame 54 and a transmission gear 55. The transmission mechanism frame 54 is fixed on the end cover 62 of the heat exchanger. The output shaft of the reducer 51 is connected to the transmission shaft 52. The transmission shaft 52 is connected to the transmission mechanism frame 54 through a sleeve. A pinion is fixed to the end of the transmission shaft 52. The pinion meshes with the transmission gear 55. The transmission gear 55 is connected with a lead screw 56. The push-pull plate 58 is fixed with a transmission nut 57 that cooperates with the lead screw 56. After the motor is started, the transmission shaft 52 is driven to rotate through the reducer 51, and the pinion on the transmission shaft drives the transmission gear 55 to rotate, thereby driving the lead screw 56 to rotate, so that the transmission nut 57 moves left and right along the lead screw 56, thereby driving the descaling element 60 to move left and right through the push-pull plate 58.

[0018] The end cover 62 is provided with a displacement sensor 53 for determining the starting and ending positions of the reciprocating stroke of the push-pull plate 58 , thereby determining the left and right extreme positions of the descaling element 60 .

[0019] During operation, the pure water device 2 replenishes the treated pure water into the electrode steam generator 1. After the steam generator 1 reaches the working liquid level, the device switch is turned on to pass the required voltage to the electrode, and the steam generator starts to work. The electrode heating method is adopted. By energizing the three-phase electrodes, the electrolyte between the electrodes undergoes ion migration to generate current. The water is directly heated by the current through the resistance of water, so that the water in the shell of the electrode steam generator is vaporized into saturated water vapor. The generated steam is sent to the shell side of the descaling heat exchanger 6 along the steam pipe 3. The steam exchanges heat with the medium in the heat exchange tube. During the heat exchange process, the steam condenses into water and flows back to the liquid phase space of the electrode steam generator through the return pipe 7. It is heated and vaporized again, and this process is repeated to provide steam continuously to realize the phase change heat exchange cycle. The electrode heating technology is combined with the vacuum phase change heating technology to form the electrode phase change heating technology. By the built-in load adjustment mechanism in the electrode steam generator and the contact area between the electrode and the water is adjusted, the load adjustment within the margin of 10%-100% can be realized.

[0020] The medium enters the heat exchanger 6 through the inlet pipeline, absorbs the heat released by the condensation of water vapor on the outer wall of the tube, and then heats up to the required temperature, flows out from the outlet of the tube to the medium buffer tank 4, and is pumped according to the process requirements of the gathering and transportation system after buffering in the buffer tank. Due to the easy scaling of oilfield media, the heat exchange tube of the descaling heat exchanger is equipped with a descaling device 5. During the use of the heat exchanger, the descaling device 5 is driven by a motor to continuously move, scraping off the scale adsorbed or deposited on the inner wall of the heat exchange tube, and the removed substances flow out of the heat exchanger 6 with the heated medium in real time, ensuring efficient heat exchange of the heat exchange tube.

[0021] The present invention can be equipped with an automated control system to monitor the operating status of the equipment in real time and automatically adjust the load. When over-temperature, over-pressure, current exceeding the limit, three-phase current imbalance, excessive hydrogen content, etc. occur, the heating furnace will automatically alarm and shut down, thus realizing an unmanned operation function.

Claims

1. An electrode-type phase-change heating buffer online descaling device, comprising a heat exchanger (6), characterized in that: The upper part of the shell of the heat exchanger (6) is connected to the electrode-type steam generator (1) via a steam pipe (3), and the lower part of the shell of the heat exchanger (6) is connected to the electrode-type steam generator (1) via a return water pipe (7); the outlet of the heat exchange tube inside the heat exchanger (6) is connected to the buffer tank (4), and a descaling device (5) is provided inside the heat exchanger (6), and the descaling device (5) is used to remove dirt on the inner wall of the heat exchange tube.

2. The electrode-type phase-change heating buffer online descaling device according to claim 1 is characterized in that: The electrode-type steam generator (1) is connected to a pure water device (2).

3. The electrode-type phase-change heating buffer online descaling device according to claim 2 is characterized in that: The electrode steam generator (1), the pure water device (2), and the heat exchanger (6) are all fixed on a skid-mounted base (8).

4. The electrode-type phase-change heating buffer online descaling device according to claim 3 is characterized in that: The descaling device (5) comprises a descaling element (60), the descaling element (60) is located in a heat exchange tube of the heat exchanger (6), the end of the descaling element (60) is connected to a push-pull plate (58), and the push-pull plate (58) is connected to a reducer (51) via a transmission mechanism.

5. The electrode-type phase-change heating buffer online descaling device according to claim 4 is characterized in that: The transmission mechanism comprises a transmission gear (55), the transmission gear (55) is connected to the output shaft of the reducer (51), a lead screw (56) is connected to the transmission gear (55), and a transmission nut (57) cooperating with the lead screw (56) is fixed to the push-pull plate (58).

6. The electrode-type phase-change heating buffer online descaling device according to claim 5 is characterized in that: The output shaft of the reducer (51) is connected to a transmission shaft (52), the transmission gear (55) is connected to the transmission shaft (52), and the transmission shaft (52) is connected to a transmission mechanism frame (54) via a shaft sleeve.

7. The electrode-type phase-change heating buffer online descaling device according to claim 6 is characterized in that: The heat exchanger (6) comprises a shell (61) and an end cover (62); the shell (61) and the end cover (62) are connected by bolts; the heat exchange tube is located in the shell (61); and the transmission mechanism frame (54) is fixed on the end cover (62).

8. The electrode-type phase-change heating buffer online descaling device according to claim 7 is characterized in that: The end cover (62) is provided with a displacement sensor (53) for determining the starting and ending positions of the reciprocating stroke of the push-pull plate (58).

Images