Heat energy recovery device for oil field heating furnace

Abstract

The utility model provides a heat energy recovery device for an oil field heating furnace, which belongs to the technical field of heat energy recycling and comprises a main body pipeline mechanism, a flue gas conveying mechanism and a water inlet mechanism, the flue gas conveying mechanism comprises a first pipeline, a third pipeline and a second pipeline which are sequentially communicated, and high-temperature flue gas passes through the first pipeline, the third pipeline and the second pipeline; a first water pipe group is arranged in the second pipeline, a third water pipe group is arranged in the first pipeline, the first water pipe group is communicated with the third water pipe group, the third water pipe group is communicated with a heat exchange pipe for outwards conveying warming water, and the water inlet mechanism conveys low-temperature water to the first water pipe group. Heat energy generated by the oil field heating furnace is efficiently recycled, and the effect of fully utilizing heat energy resources is achieved.

Description

Technical Field

[0001] This utility model relates to the field of heat energy recovery and utilization technology, and in particular to a heat energy recovery device for oilfield heating furnaces. Background Technology

[0002] As one of the key pieces of equipment in the crude oil gathering and transportation system, the oilfield heating furnace is used to increase the temperature of fluids such as oil and natural gas. The safety and stability of its operation are crucial to the entire oil production process. At the same time, as a high-energy-consuming device, the heating furnace is also commonly characterized by high flue gas temperature, low thermal efficiency, and drastic load fluctuations.

[0003] When operating in an oilfield heating furnace, it can make the flow of oil and gas in the oil well smoother to a certain extent, thereby improving the efficiency of oil well production. However, the heating of oil and gas is often accompanied by heat loss, resulting in a waste of resources. Utility Model Content

[0004] To address the above problems and reduce the waste of heat generated during the heating process, this utility model provides a heat recovery device for oilfield heating furnaces. This device recovers and utilizes the energy in the high-temperature flue gas generated during the operation of the oilfield heating furnace, thereby reducing energy consumption, improving heat utilization efficiency, and simultaneously reducing the temperature of the discharged flue gas, thus reducing environmental pollution.

[0005] This utility model provides a heat recovery device for an oilfield heating furnace, including a main pipeline structure, a flue gas conveying mechanism, and a water inlet mechanism. The flue gas conveying mechanism includes a first pipe, a third pipe, and a second pipe that are connected in sequence and through which high-temperature flue gas passes. A first water pipe group is installed in the second pipe, and a third water pipe group is installed in the first pipe. The first water pipe group and the third water pipe group are connected. The third water pipe group is connected to a heat exchange pipe that conveys heated water to the outside. The water inlet mechanism conveys low-temperature water to the first water pipe group.

[0006] As a further improvement of this utility model, the first water pipe group is connected to a mixing tank through a first connecting pipe, the mixing tank is connected to the third water pipe group through a second connecting pipe and a second connecting channel, a third connecting pipe for return water is also provided between the third water pipe group and the mixing tank, and the mixing tank is connected to a heat exchange pipe.

[0007] As a further improvement of this utility model, the first water pipe group is connected to a mixing tank through a first connecting pipe, the mixing tank is connected to the third water pipe group through a second connecting pipe and a second connecting channel, and the third water pipe group is connected to the heat exchange pipe through a third connecting pipe.

[0008] As a further improvement of this utility model, the main pipeline structure also includes a second water pipe group located inside the second pipeline and below the first water pipe group. The inlet of the second water pipe group is connected to the mixing tank through a second connecting pipe and a first connecting channel. The outlet of the second water pipe group is connected to the mixing tank or the outlet of the second water pipe group is connected to the heat exchange pipe.

[0009] As a further improvement of this utility model, when the outlet of the second water pipe group is connected to the mixing tank, the outlet of the second water pipe group is connected to the first water pipe group.

[0010] As a further improvement of this utility model, the outlet of the second water pipe assembly is connected to the mixing tank or heat exchange pipe through the fourth connecting pipe.

[0011] As a further improvement of this utility model, one end of the second connecting pipe is connected to the mixing tank, and the other end is connected to the first connecting channel and the second connecting channel respectively through a water pipe tee.

[0012] As a further improvement of this utility model, a support plate is provided inside the second pipe, located between the first water pipe group and the second water pipe group. The support plate is fixed inside the second pipe to support the first water pipe group, and the support plate has a through hole that allows flue gas to pass through.

[0013] As a further improvement of this utility model, the water inlet mechanism includes a water inlet pipe, a water pump, a delivery pipe and a water tank. The water inlet pipe and the delivery pipe are respectively connected to the water pump. The end of the water inlet pipe away from the water pump is connected to the first water pipe group, and the end of the delivery pipe away from the water pump is connected to the water tank.

[0014] As a further improvement of this utility model, the flue gas conveying mechanism is U-shaped, the first pipe and the second pipe are arranged opposite to each other, and the third pipe connects the first pipe and the second pipe.

[0015] This invention provides a heat recovery device for oilfield heating furnaces, which performs heat exchange treatment on the high-temperature flue gas generated during the use of the oilfield heating furnace before it is discharged, recovers the heat in the flue gas, and reduces the temperature of the flue gas. The high-temperature flue gas undergoes heat exchange at least twice in the channel, thereby achieving the effect of efficient heat recovery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the heat recovery device for an oilfield heating furnace according to this utility model.

[0017] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0018] Figure 3This is a partial structural cross-sectional view of the heat recovery device for oilfield heating furnaces according to this utility model.

[0019] Figure 4 This is a schematic diagram of the internal structure of the mixing box of the heat recovery device for oilfield heating furnaces according to this utility model.

[0020] Figure 5 This is a schematic diagram of the support plate and support block structure of the heat recovery device for oilfield heating furnaces according to this utility model.

[0021] Figure 6 This is a schematic diagram of the internal structure of the mixing box according to an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the internal structure of the mixing box according to another embodiment of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Main piping structure; 101. First water pipe group; 102. First connecting pipe; 103. Mixing box; 104. Second connecting pipe; 105. Water pipe tee; 106. First connecting channel; 107. Second water pipe group; 108. Second connecting channel; 109. Third water pipe group; 110. Third connecting pipe; 111. Heat exchange pipe; 112. Fourth connecting pipe; 2. Flue gas conveying mechanism; 201. Outer shell; 202. Flue gas inlet pipe; 203. Flue gas outlet pipe; 204. First pipe; 205. Second pipe; 206. Support plate; 207. Support block; 208. Third pipe; 3. Water inlet mechanism; 301. Water inlet pipe; 302. Water pump; 303. Conveying pipe; 304. Water tank. Detailed Implementation

[0024] The following describes specific embodiments and appendices. Figure 1-7 The utility model is described in detail so that those skilled in the art can more fully understand its purpose, features and effects.

[0025] Unless otherwise specified, all technical and scientific terms used in this utility model shall have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. In the event of any discrepancy between the definitions of terms in this utility model and their commonly understood meanings by one of ordinary skill in the art to which this utility model pertains, the definitions set forth in this utility model shall prevail.

[0026] This utility model provides a heat recovery device for oilfield heating furnaces, which recovers waste heat from the flue gas generated by the oilfield heating furnaces, thereby reducing heat waste.

[0027] Example 1

[0028] As a specific embodiment of this utility model, this embodiment provides a heat recovery device for an oilfield heating furnace, referring to... Figure 1It includes a main pipeline system 1, a flue gas conveying system 2, and a water inlet system 3. The water inlet system 3 conveys low-temperature water to the main pipeline system 1. The low-temperature water in the main pipeline system 1 exchanges heat with the high-temperature flue gas in the flue gas conveying system 2, and the temperature is increased before it is output and utilized. At the same time, it reduces the temperature of the flue gas generated during the use of the oilfield heating furnace.

[0029] Reference Figure 1 , Figure 3 The flue gas conveying mechanism 2 includes a U-shaped outer shell 201. The interior of the outer shell 201 is interconnected, forming a first pipe 204 and a second pipe 205 that are vertically aligned and opposite to each other, and a third pipe 208 that is horizontally connected to the first pipe 204 and the second pipe 205. In this embodiment, the cross-sections of the first pipe 204, the second pipe 205, and the third pipe 208 are all square.

[0030] A flue gas inlet pipe 202, communicating with the first pipe 204, is fixed to the upper part of the side of the first pipe 204 opposite to the second pipe 205. A flue gas outlet pipe 203, communicating with the second pipe 205, is fixed to the upper part of the side of the second pipe 205 opposite to the first pipe 204. That is, the flue gas inlet pipe 202 and the flue gas outlet pipe 203 are arranged opposite to each other. In use, the flue gas inlet pipe 202 is connected to the flue gas discharge pipe of the oilfield heater. The high-temperature flue gas generated by the oilfield heater enters the outer shell 201 through the flue gas inlet pipe 202, passes through the first pipe 204, the third pipe 208 and the second pipe 205 in sequence, and is finally discharged directly into the atmosphere or transported to the next flue gas treatment equipment through the flue gas outlet pipe 203.

[0031] The main pipeline structure 1 includes a first water pipe group 101 and a second water pipe group 107 located vertically spaced within the second pipeline 205, wherein the first water pipe group 101 is located above the second water pipe group 107, and a third water pipe group 109 located within the first pipeline 204. The first water pipe group 101, the second water pipe group 107, and the third water pipe group 109 are all composed of multiple interconnected serpentine pipes. The water inlet mechanism 3 supplies low-temperature water to the first water pipe group 101.

[0032] A mixing box 103 is provided between the upper parts of the first pipe 204 and the second pipe 205. Specifically, the mixing box 103 is cylindrical and its two ends are fixedly connected to the first pipe 204 and the second pipe 205 respectively. The two ends of the mixing box 103 are not connected to the first pipe 204 and the second pipe 205.

[0033] Combination Figure 4The first water pipe assembly 101 is connected to the mixing tank 103 via a first connecting pipe 102 located outside the second pipe 205. The third water pipe assembly 109 is connected to the mixing tank 103 via a third connecting pipe 110 located outside the first pipe 204. The first water pipe assembly 101 is connected to the second water pipe assembly 107. A one-way valve is installed in the second water pipe assembly 107 near the first water pipe assembly 101 to ensure that water can only flow from the second water pipe assembly 107 to the first water pipe assembly 101 and cannot flow in the opposite direction.

[0034] Preferably, the connection point between the first connecting pipe 102 and the mixing tank 103 is located at the bottom of the mixing tank 103, and the connection point between the third connecting pipe 110 and the mixing tank 103 is also located at the bottom of the mixing tank 103. Both the first connecting pipe 102 and the third connecting pipe 110 are equipped with one-way valves, ensuring that water flow can only proceed from the first water pipe assembly 101 and the third water pipe assembly 109 towards the mixing tank 103.

[0035] The mixing tank 103 is also provided with a heat exchange pipe 111 that communicates with the interior of the mixing tank 103. The water that has been heated after heat exchange is finally transported out through the heat exchange pipe 111 for reuse. Preferably, the connection between the heat exchange pipe 111 and the mixing tank 103 is located at the top of the mixing tank 103.

[0036] Furthermore, a second connecting pipe 104 is fixedly installed at the bottom of the mixing box 103, extending downward into the third pipe 208, and the top end of the second connecting pipe 104 is connected to the mixing box 103.

[0037] The bottom end of the second connecting pipe 104 is connected to the first connecting channel 106 and the second connecting channel 108 respectively through the water pipe tee 105. The end of the first connecting channel 106 away from the second connecting pipe 104 is connected to the second water pipe group 107, and the end of the second connecting channel 108 away from the second connecting pipe 104 is connected to the third water pipe group 109.

[0038] First, the flue gas generated by heating the oil and gas in the oil well enters through the flue gas inlet pipe 202. The high-temperature flue gas passes through the first pipe 204, the third pipe 208, and the second pipe 205. The low-temperature water entering the first water pipe group 101 first exchanges heat with the high-temperature flue gas and then enters the mixing box 103 through the first connecting pipe 102. At this time, the water entering the mixing box 103 is divided into two parts. One part is transported to the outside through the heat exchange pipe 111, and the other part enters the second water pipe group 107 through the first connecting channel 106 after passing through the second connecting pipe 104, and then enters the third water pipe group 109 through the second connecting channel 108 for secondary heat exchange. Water undergoing secondary heat exchange in the second water pipe group 107 enters the first water pipe group 101 and mixes with the initially entering low-temperature cold water, undergoing another heat exchange. Then, it enters the mixing tank 103 via the first connecting pipe 102. Water undergoing secondary heat exchange in the third water pipe group 109 enters the mixing tank 103 via the third connecting pipe 110. The water transported by the first connecting pipe 102 and the third connecting pipe 110 is mixed in the mixing tank 103. In the heat recovery device for oilfield heating furnaces of this invention, while heated water is output from the heat exchange pipe 111, the device undergoes a semi-circular multiple heat exchange process, improving heat exchange efficiency.

[0039] The water transported by the first connecting pipe 102 and the third connecting pipe 110 is mixed again in the mixing box 103. Part of it is transported to the outside through the heat exchange pipe 111, and the other part re-enters the second connecting pipe 104. In the continuous circulation, it achieves full heat exchange with the flue gas, so that the water reaches a higher temperature.

[0040] In addition, along the path of the high-temperature flue gas, the water in the third water pipe group 109 first exchanges heat with the flue gas to reduce the flue gas temperature. Then, the water in the second water pipe group 107 and the first water pipe group 101 exchange heat with the flue gas to further reduce the flue gas temperature and recover the heat energy in the flue gas, thus achieving multiple heat exchanges with the flue gas.

[0041] Reference Figure 1 , Figure 2 The water inlet mechanism 3 includes an inlet pipe 301 that penetrates the outer casing 201 and connects to the first water pipe assembly 101, a water pump 302, a delivery pipe 303, and a water tank 304. The end of the inlet pipe 301 furthest from the first water pipe assembly 101 is connected to the water pump 302. One end of the delivery pipe 303 is connected to the water pump 302, and the other end is connected to the water tank 304. The water pump 302 is fixed to the top of the water tank 304. When the water pump 302 is started, the low-temperature water in the water tank 304 enters the first water pipe assembly 101 through the delivery pipe 303 and the inlet pipe 301, providing hot water for replacement to the main pipeline mechanism 1, ensuring convenient water delivery.

[0042] Reference Figure 3 , Figure 5The second pipe 205 is provided with a support plate 206 to support the first water pipe assembly 101, improving stability during operation. The support plate 206 is perpendicular to the second pipe 205, and a square hole is provided in the middle of the support plate 206 to allow flue gas to pass through. In other embodiments, the square hole of the support plate 206 can also be a through hole of other shapes, such as a circle, a triangle, or other polygons.

[0043] The upper surface of the support plate 206 is fixed with a support block 207 for placing the first water pipe group 101. Multiple support blocks 207 are symmetrically arranged and the upper surface of the support block 207 is arc-shaped so as to be compatible with the pipeline of the first water pipe group 101.

[0044] Furthermore, in this embodiment, in order to ensure smooth water flow in the pipeline, a power pump is provided on the first connecting pipe 106 and the second connecting pipe 108 to maintain the water flow rate in the pipeline.

[0045] Example 2

[0046] As a specific embodiment of this utility model, this embodiment provides a heat recovery device for an oilfield heating furnace, referring to... Figure 1 , Figure 6 The difference from Embodiment 1 is that the third connecting pipe 110 is not connected to the mixing box 103, the heat exchange pipe 111 is not connected to the mixing box 103, and the third connecting pipe 110 passes through the mixing box 103 and is connected to the heat exchange pipe 111.

[0047] In this embodiment, firstly, the flue gas generated by heating the oil and gas in the oil well enters through the flue gas inlet pipe 202. The high-temperature flue gas passes through the first pipe 204, the third pipe 208, and the second pipe 205. The low-temperature water entering the first water pipe group 101 first exchanges heat with the high-temperature flue gas and then enters the mixing box 103 through the first connecting pipe 102. The water entering the mixing box 103 enters the second water pipe group 107 through the second connecting pipe 104 and then enters the third water pipe group 109 through the second connecting channel 106 for secondary heat exchange. The water that has undergone secondary heat exchange in the second water pipe group 107 enters the first water pipe group 101 and mixes with the low-temperature cold water that initially entered the first water pipe group 101 for further heat exchange, and then enters the mixing box 103 through the first connecting pipe 102. The water that has undergone secondary heat exchange in the third water pipe group 109 is transported outward through the third connecting pipe 110 and the heat exchange pipe 111. In the heat recovery device for oilfield heating furnace of this utility model, while the heated water is output from the heat exchange tube 111, the device undergoes a semi-circular multiple heat exchange process, which improves the heat exchange efficiency.

[0048] Example 3

[0049] As a specific embodiment of this utility model, this embodiment provides a heat recovery device for an oilfield heating furnace, referring to... Figure 1 , Figure 7 The difference from Embodiment 2 is that the second water pipe group 107 is not connected to the first water pipe group 101, and the second water pipe group 107 is directly connected to the heat exchange pipe 111 through the fourth connecting pipe 112.

[0050] In this embodiment, firstly, the flue gas generated by heating the oil and gas in the oil well enters through the flue gas inlet pipe 202. The high-temperature flue gas passes through the first pipe 204, the third pipe 208, and the second pipe 205. The low-temperature water entering the first water pipe group 101 first exchanges heat with the high-temperature flue gas and then enters the mixing box 103 through the first connecting pipe 102. The water entering the mixing box 103 enters the second water pipe group 107 through the second connecting pipe 104 and then enters the third water pipe group 109 through the first connecting channel 106 for secondary heat exchange. The water in the second water pipe group 107 that has undergone secondary heat exchange reaches the heat exchange tube 111 through the fourth connecting pipe 112; the water in the third water pipe group 109 that has undergone secondary heat exchange reaches the heat exchange tube 111 through the third connecting pipe 110, and then mixes in the heat exchange tube 111 and is output. In the heat recovery device for oilfield heating furnace of this utility model, while the heated water is output from the heat exchange tube 111, the low temperature water is subjected to secondary heat exchange before being transported out, thereby improving the heat exchange efficiency.

[0051] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any modifications or equivalent changes made based on the technical essence of the present utility model shall still fall within the scope of protection claimed by the present utility model.

Claims

1. A heat energy recovery device for oil field heating furnace, comprising a main pipeline mechanism (1), a flue gas conveying mechanism (2) and a water inlet mechanism (3), characterized in that, The flue gas conveying mechanism (2) comprises a first pipeline (204), a third pipeline (208) and a second pipeline (205) which are sequentially communicated and through which high-temperature flue gas passes, a first water pipe group (101) is arranged in the second pipeline (205), a third water pipe group (109) is arranged in the first pipeline (204), the first water pipe group (101) is communicated with the third water pipe group (109), the third water pipe group (109) is communicated with a heat exchange pipe (111) for conveying the warmed water outward, and the water inlet mechanism (3) conveys low-temperature water to the first water pipe group (101).

2. The heat energy recovery device for an oil field heating furnace according to claim 1, characterized by The first water pipe group (101) is connected with a mixing box (103) through a first connecting pipe (102), the mixing box (103) is communicated with the third water pipe group (109) through a second connecting pipe (104) and a second connecting channel (108), and a third connecting pipe (110) for returning water is further arranged between the third water pipe group (109) and the mixing box (103).

3. The heat energy recovery device for an oil field heating furnace according to claim 1, characterized by The first water pipe group (101) is connected with a mixing box (103) through a first connecting pipe (102), the mixing box (103) is communicated with the third water pipe group (109) through a second connecting pipe (104) and a second connecting channel (108), and a third connecting pipe (110) for returning water is further arranged between the third water pipe group (109) and the mixing box (103).

4. The heat energy recovery device for an oil field heating furnace according to claim 2 or 3, characterized by The main pipeline mechanism (1) further comprises a second water pipe group (107) which is arranged in the second pipeline (205) and below the first water pipe group (101), a water inlet of the second water pipe group (107) is communicated with the mixing box (103) through the second connecting pipe (104) and a first connecting channel (106), and a water outlet of the second water pipe group (107) is communicated with the mixing box (103) or the water outlet of the second water pipe group (107) is communicated with the heat exchange pipe (111).

5. The heat energy recovery device for an oil field heating furnace according to claim 4, characterized by When the water outlet of the second water pipe group (107) is communicated with the mixing box (103), the water outlet of the second water pipe group (107) is communicated with the first water pipe group (101).

6. The heat energy recovery device for an oil field heating furnace according to claim 4, characterized by The water outlet of the second water pipe group (107) is communicated with the mixing box (103) or the heat exchange pipe (111) through a fourth connecting pipe (112).

7. The heat recovery device for oil field heating furnaces according to claim 4, characterized by One end of the second connecting pipe (104) is connected with the mixing box (103), and the other end is connected with the first connecting channel (106) and the second connecting channel (108) respectively through a water pipe tee joint (105).

8. The heat recovery device for an oil field furnace according to claim 4, characterized by The second pipeline (205) is provided with a support plate (206) between the first water pipe group (101) and the second water pipe group (107), the support plate (206) is fixed in the second pipeline (205) and is used for supporting the first water pipe group (101), and the support plate (206) is provided with a through hole allowing flue gas to pass.

9. The heat recovery device for oil field heating furnaces according to claim 1, characterized by The water inlet mechanism (3) comprises a water inlet pipe (301), a water pump (302), a conveying pipe (303) and a water tank (304), the water inlet pipe (301) and the conveying pipe (303) are connected with the water pump (302) respectively, one end of the water inlet pipe (301) far from the water pump (302) is connected with the first water pipe group (101), and one end of the conveying pipe (303) far from the water pump (302) is connected with the water tank (304).

10. The thermal energy recovery device for an oilfield furnace according to claim 1, characterized by The flue gas conveying mechanism (2) is in a U shape, the first pipeline (204) and the second pipeline (205) are oppositely arranged, and the third pipeline (208) communicates the first pipeline (204) and the second pipeline (205).

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