Latent heat recycling device and method of oil field heating furnace

Abstract

The invention relates to the technical field of waste heat recycling, in particular to a latent heat recycling device and method for an oil field heating furnace, the device comprises a combustor, a heating furnace, a water tank, a recycling system and a smoke exhaust pipe, and the recycling system comprises a treatment cavity, a smoke collecting cavity and a smoke exhaust branch pipe; the treatment cavity comprises a heating water cavity and a preheating water cavity; the smoke collecting cavity is arranged below the processing cavity and connected with the smoke exhaust pipe, and the smoke exhaust branch pipes are communicated with the smoke collecting cavity and penetrate through the processing cavity. Heat transfer medium water is heated through the high-temperature smoke exhaust branch pipe, utilized smoke is discharged after being treated by activated carbon, water in the spiral water pipe is preheated while water is boiled to generate water vapor through the design of the pipeline, and the smoke heat is utilized in a gradient mode; elbow joints convenient to disassemble are designed on the smoke exhaust branch pipes, large-particle impurity deposits in smoke are collected, the cost is low, replacement is convenient, heating water and water vapor generated in the process can be reused, and resources are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery and utilization, and particularly to a latent heat reuse device and method for an oilfield heating furnace. Background Art

[0002] In the process of oil and gas gathering and transportation, it is necessary to heat the crude oil to a certain temperature to meet the dehydration and stabilization of the oil. The conventional method is to heat the crude oil through a heating furnace, that is, using the flame of fuel combustion in the heating furnace as the heating agent to heat the medium flowing in the heating furnace cavity, so that the crude oil in the oil pipe is heated and dehydrated. However, the current thermal efficiency of heating furnaces is generally about 70%, and there are various reasons for heat loss. The relatively large proportion is the heat dissipation of the flue gas, and the exhausted flue gas is difficult to be effectively utilized, ultimately resulting in waste of resources. Therefore, how to effectively utilize the exhausted flue gas has become a new research direction.

[0003] In the prior art, a Chinese invention patent with the application number "CN201510657795.8" discloses a flue gas waste heat recovery and utilization system, including a spray type heat exchange tower for recovering latent heat and a sensible heat recovery mechanism for recovering sensible heat. One end of the sensible heat recovery mechanism is provided with a flue gas inlet, and the other end is connected to the spray type heat exchange tower; the flue gas first enters the sensible heat recovery mechanism for sensible heat exchange, and the flue gas after sensible heat exchange enters the spray type heat exchange tower for latent heat exchange. Compared with the traditional waste heat recovery system, it has multiple operation modes such as single sensible heat recovery, simultaneous recovery of sensible heat and latent heat, and separate recovery of sensible heat and latent heat; the invention recovers and utilizes the latent heat and sensible heat of the flue gas in a stepped manner by designing a heat exchange tower and a sensible heat recovery mechanism, and the flue gas waste heat is recovered more thoroughly and the recovery efficiency is higher.

[0004] However, in the above solution, the flue gas is directly discharged into the heat exchange tower through the heat exchange pipe, resulting in the deposition of impurities in the flue gas. After being mixed with the condensed water, it cannot be directly used. The water treatment mechanism increases the economic cost, and the treatment effect is poor and it is difficult to be used for domestic hot water; the condensed water is difficult to completely absorb the harmful substances in the flue gas, and direct discharge does not meet the environmental protection requirements, and the deposition of large particle impurities in the flue gas is difficult to remove.

[0005] Therefore, aiming at the above defects, there is an urgent need for a latent heat reuse device and method for an oilfield heating furnace. Summary of the Invention

[0006] In order to avoid the above problems existing in the prior art, the purpose of the present invention is to provide a latent heat reuse device and method for an oilfield heating furnace.

[0007] To achieve the above object, the present invention provides the following technical solutions: a latent heat recycling device for an oilfield heating furnace, comprising a burner, a heating furnace and a water tank, wherein the heating furnace is installed on one side of the burner, and the water tank is installed above the heating furnace; the latent heat recycling device for the oilfield heating furnace also includes a recycling system and a smoke exhaust pipe, wherein one end of the heating furnace away from the burner is connected to one end of the smoke exhaust pipe, and the other end of the smoke exhaust pipe is connected to the bottom of the recycling system;

[0008] The recycling system includes a processing chamber, a smoke collecting chamber and a smoke exhaust branch pipe; the processing chamber is a stepped heat transfer structure, and the processing chamber includes a heating water chamber and a preheated water chamber; the smoke collecting chamber is arranged below the processing chamber and connected to the smoke exhaust pipe, and the smoke exhaust branch pipe is connected to the smoke collecting chamber and runs through the processing chamber.

[0009] The present invention is further configured such that the interior of the processing chamber is divided into a heating water chamber and a preheating water chamber by a partition, the heating water chamber is below the partition, and the preheating water chamber is above the partition.

[0010] The present invention is further configured such that a plurality of spirally arranged spiral water pipes are provided in the preheating water chamber, the lower ends of the spiral water pipes are connected to water outlet pipes, and the water outlet pipes pass through the partition plate to communicate with the heating water chamber.

[0011] The present invention is further configured such that the activated carbon adsorption device is provided on the top of the processing chamber, and the terminal of the smoke exhaust branch pipe is connected to the activated carbon adsorption device.

[0012] The present invention is further configured such that a smoke outlet is provided at the top of the processing chamber.

[0013] The present invention is further configured such that a drain pipe is provided on one side of the heating water chamber, and a valve is provided on the drain pipe.

[0014] The present invention is further configured such that the top of the processing chamber is a detachable structure. The processing chamber comprises a processing chamber cover and a processing chamber body at the top, and the processing chamber cover and the processing chamber body are fixedly installed by conventional connection structures such as bolts.

[0015] The present invention is further configured such that a bend pipe joint is provided at the bottom of the smoke exhaust branch pipe, both ends of the bend pipe joint are detachably connected by flanges, and the bend pipe joint is an S-shaped pipe.

[0016] The present invention is further configured such that the elbow joint is arranged between the processing chamber and the smoke collecting chamber.

[0017] The present invention is further configured such that a plurality of inclined baffles are staggeredly arranged inside the smoke exhaust branch pipe.

[0018] The present invention is further configured such that the length of the baffle gradually decreases from bottom to top.

[0019] The present invention is further configured such that the latent heat reuse device of the oilfield heating furnace further includes a bracket, and the bracket is arranged above the outside of the burner, the heating furnace and the water tank; the reuse system is arranged on the bracket, and the exhaust pipe passes through the bracket and is connected to the smoke collecting chamber at the bottom of the reuse system.

[0020] The present invention is further configured such that a water tank and a steam container are further arranged on the bracket, and a water pump is arranged in the water tank; the water tank is communicated with the spiral water pipe through a water delivery pipe; a valve is arranged on the water delivery pipe, and the heating water chamber is communicated with the steam container through an exhaust pipe.

[0021] The present invention is further configured such that the water tank is communicated with the steam container through a steam pipe.

[0022] The present invention also provides a method for latent heat reuse of an oilfield heating furnace, which is applicable to the above-mentioned latent heat reuse device of an oilfield heating furnace; the method includes the following steps:

[0023] S1: Use the burner to heat the heating furnace, and the flue gas generated during the heating process is transported to the smoke collecting chamber at the bottom of the reuse system through the exhaust pipe; the water vapor generated during the heating process enters the steam container through the steam pipe;

[0024] S2: The flue gas is collected in the smoke collecting chamber and dispersed into each exhaust branch pipe. The exhaust branch pipe penetrates from the bottom of the treatment chamber to its upper end and finally inserts into the activated carbon adsorption device. The flue gas filtered by the activated carbon adsorption device is discharged from the smoke outlet; activated carbon for filtering flue gas is placed in the activated carbon adsorption device;

[0025] S3: Open the valve on the water delivery pipe, and transfer the water to be heated in the water tank to the spiral water pipe through the water delivery pipe by the water pump. When the water to be heated flows in the spiral water pipe, it is preheated through the preheating of the exhaust branch pipe, and finally flows into the heating water chamber and is heated by the exhaust branch pipe;

[0026] S4: The hot water in the heating water chamber is discharged through the valve on the drain pipe, and the water vapor generated in the heating water chamber is collected in the steam container through the exhaust pipe.

[0027] In summary, the beneficial effects of the above technical solutions of the present invention are as follows:

[0028] 1. In the present invention, the heat transfer medium water is heated by the exhaust pipe with high temperature, and the heated water is used for domestic water. The used flue gas is treated by activated carbon and then discharged. Through the design of the pipeline, on the one hand, the heat of the flue gas makes the heat transfer medium water boil to generate water vapor, and on the other hand, it preheats the water in the spiral water pipe, and the heat of the flue gas is utilized in a cascade manner; and when exhausting the flue gas, an activated carbon adsorption device is adopted, and the discharged flue gas meets the environmental protection requirements.

[0029] 2. In the present invention, the water used to absorb the heat of the exhaust pipe does not directly contact the flue gas. After the hot water absorbs heat, there are no additional harmful substances in it. It can avoid using chemicals to ensure the cleanliness of the water, and can be directly used for domestic water after simple treatment, saving economic costs.

[0030] 3. In the present invention, by designing a detachable elbow joint on the exhaust branch pipe, large particle impurities in the flue gas are collected and deposited, and the elbow joint is disassembled and cleaned regularly, reducing the replacement frequency of the activated carbon adsorption device, with low cost and convenient replacement.

[0031] 4. In the present invention, by designing staggered baffles, the exhaust speed of the flue gas is reduced, and the waste heat is fully utilized to heat the water. The design of gradually shortening from bottom to top makes the flue gas at the lower part of the exhaust branch pipe slower than that at the upper part, leaving more time for heat exchange between cold and hot at the lower part.

[0032] 5. The present invention can make full use of the clean energy of water vapor in the heating medium and the heat transfer medium to clean the oil stains in the oil reuse system, avoiding waste of resources.

[0033] 6. In the present invention, the water vapor collected in the steam container and the hot water after absorbing heat in the heating water cavity can be reused in other processes on the site or for domestic use. The waste heat recovery of the flue gas is more thorough and the recovery efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 It is a schematic diagram of the main structure of a latent heat reuse device for an oilfield heating furnace of the present invention;

[0036] Figure 2 It is a schematic diagram of the structure of the reuse system described in the present invention;

[0037] Figure 3 For Figure 2 the view in the direction indicated by the arrow A in

[0038] Figure 4 It is a schematic diagram of the elbow joint structure of a latent heat reuse device for an oilfield heating furnace of the present invention;

[0039] Figure 5 It is a schematic diagram of the exhaust branch pipe structure described in the present invention.

[0040] In the drawings, the meanings of the various marks are as follows:

[0041] 1. Support, 2. Burner, 3. Heating furnace, 4. Water tank, 5. Water reservoir, 6. Steam container, 7. Exhaust pipe, 8. Steam pipe, 9. Water supply pipe, 10. Exhaust steam pipe, 11. Smoke collection chamber, 12. Exhaust smoke branch pipe, 13. Heated water chamber, 14. Drain pipe, 15. Partition board, 16. Spiral water pipe, 17. Activated carbon adsorption device, 18. Treatment chamber, 181. Treatment chamber top cover, 182. Treatment chamber body, 19. Smoke outlet, 20. Water outlet pipe, 21. Elbow joint, 22. Reutilization system, 23. Baffle, 24. Valve, 25. Preheated water chamber. Detailed implementation mode

[0042] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments of the present invention, other similar embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0043] In addition, the directional terms mentioned in the following embodiments, such as "up", "down", "left", "right", etc. are only with reference to the directions of the drawings. Therefore, the directional terms used are for illustration rather than to limit the present invention.

[0044] The present invention will be further described below in conjunction with the drawings and preferred embodiments.

[0045] Embodiment 1:

[0046] As Figures 1 - 5 shown, it is a preferred embodiment of the present invention. A latent heat reutilization device for an oilfield heating furnace includes a burner 2, a heating furnace 3 and a water tank 4. The burner 2 is installed on one side of the heating furnace 3, and the water tank 4 is installed above the heating furnace 3. The latent heat reutilization device for the oilfield heating furnace further includes a reutilization system 22 and an exhaust pipe 7. One end of the heating furnace 3 away from the burner 2 is connected to one end of the exhaust pipe 7, and the other end of the exhaust pipe 7 is connected to the bottom of the reutilization system 22.

[0047] As Figure 2 shown, the reutilization system 22 includes a treatment chamber 18, a smoke collection chamber 11 and an exhaust smoke branch pipe 12. The treatment chamber 18 is a stepped heat transfer structure, and the treatment chamber 18 includes a heated water chamber 13 and a preheated water chamber 25. The smoke collection chamber 11 is arranged below the treatment chamber 18 and is connected to the exhaust pipe 7, and the exhaust smoke branch pipe 12 communicates with the smoke collection chamber 11 and penetrates through the treatment chamber 18.

[0048] Combined with Figure 1 、 Figure 3As shown in the figure, the latent heat reuse device of the oilfield heating furnace further includes a bracket 1, which is arranged above the outside of the burner 2, the heating furnace 3 and the water tank 4; a water tank 5, a steam container 6 and a reuse system 22 are installed at the upper end of the bracket 1. One end of the exhaust pipe 7 is connected to the end of the heating furnace 3 away from the burner 2, and the other end of the exhaust pipe 7 is connected to the bottom of the reuse system 22 and fixed on the bracket 1. The water tank 4 is communicated with the steam container 6 through a steam pipe 8.

[0049] The inside of the treatment chamber 18 is separated into a heating water chamber 13 and a preheating water chamber 25 by a partition 15. The heating water chamber 13 is below the partition 15, and the preheating water chamber 25 is above the partition 15.

[0050] A plurality of spiral water pipes 16 are spirally arranged in the preheating water chamber 25. The lower end of the spiral water pipe 16 is connected to a water outlet pipe 20, and the water outlet pipe 20 passes through the partition 15 to communicate with the heating water chamber 13. The water tank 5 is communicated with the spiral water pipe 16 through a water delivery pipe 9; a valve 24 is provided on the water delivery pipe 9, and the heating water chamber 13 is communicated with the steam container 6 through an exhaust pipe 10.

[0051] It should be noted that the purpose of dividing the treatment chamber 18 into the heating water chamber 13 and the preheating water chamber 25 is as follows: after the exhaust smoke branch pipe 12 exchanges heat in the heating water chamber 13, the higher the position, the lower the heat. Therefore, the water in the spiral water pipe 16 is preheated by using the part with lower heat in the upper part to make full use of the heat of the exhaust smoke branch pipe 12.

[0052] An activated carbon adsorption device 17 is arranged at the top of the treatment chamber 18, and the terminal of the exhaust smoke branch pipe 12 is connected to the activated carbon adsorption device 17.

[0053] A smoke outlet 19 is arranged at the top end of the treatment chamber 18. The top of the treatment chamber 18 is of a detachable structure. In this embodiment, the treatment chamber 18 includes a treatment chamber top cover 181 and a treatment chamber body 182 at the top, and the treatment chamber top cover 181 and the treatment chamber body 182 are fixedly installed through conventional connection structures such as bolts.

[0054] The detachable design above the treatment chamber 18 is convenient for replacing the activated carbon adsorption device 17 and cleaning the heating water chamber 13 and the preheating water chamber 25.

[0055] A drain pipe 14 is arranged on one side of the heating water chamber 13, and a valve 24 is provided on the drain pipe 14.

[0056] As Figure 4 As shown in the figure, a bend joint 21 is arranged at the bottom of the exhaust smoke branch pipe 12. Both ends of the bend joint 21 are connected in a flange detachable manner, and the bend joint 21 is an S-shaped pipe. The bend joint 21 is arranged between the treatment chamber 18 and the smoke collecting chamber 11.

[0057] like Figure 5 As shown, a plurality of inclined baffles 22 are staggeredly arranged inside the smoke exhaust branch pipe 12. The length of the baffles 22 gradually decreases from bottom to top.

[0058] The baffle 23 can make the smoke move more slowly. The gradually shortened design from bottom to top makes the smoke in the lower part of the smoke exhaust pipe 12 move more slowly than that in the upper part, leaving more time for the lower part to exchange heat.

[0059] Embodiment 2:

[0060] like Figures 1 - 5 The present invention also includes a method for recycling latent heat of an oilfield heating furnace, which is applicable to the latent heat recycling device of the above-mentioned oilfield heating furnace, and comprises the following steps:

[0061] S1: Use the burner 2 to heat the heating furnace 3, and the smoke generated during the heating process is transported to the smoke collecting chamber 11 at the bottom of the recycling system 22 through the smoke exhaust pipe 7; the water vapor generated during the heating process enters the steam container 6 through the steam pipe 8;

[0062] S2: The smoke is collected in the smoke collecting chamber 11 and dispersed into each smoke exhaust branch pipe 12. The smoke exhaust branch pipe 12 runs from the bottom of the processing chamber 18 to its upper end and is finally inserted into the activated carbon adsorption device 17. The smoke filtered by the activated carbon adsorption device 17 is discharged from the smoke outlet 19.

[0063] S3: Open the valve 24 on the water delivery pipe 9, and transfer the water to be heated in the water tank 5 to the spiral water pipe 16 through the water delivery pipe 9 by a water pump. When the water to be heated flows in the spiral water pipe 16, it is preheated by the preheating of the smoke exhaust branch pipe 12, and finally flows into the heating water chamber 13, and is heated by the smoke exhaust branch pipe 12;

[0064] S4: The hot water in the heating water chamber 13 is discharged through the valve 24 on the drain pipe 14, and the water vapor generated in the heating water chamber 13 is collected in the steam container 6 through the exhaust pipe 10. The water vapor collected in the steam container 6 can be reused in other processes of the site or for daily life. The heated water in the heating water chamber 13 is also used in other processes of the site or for daily life after being discharged from the drain pipe 14.

[0065] In summary, in the present invention, the flue gas pipe 7 with high temperature heats the heat transfer medium water, and the heated water is used for domestic water. The exhausted flue gas is treated by activated carbon and then discharged. Through the design of the pipeline, on the one hand, the heat of the flue gas causes the heat transfer medium water to boil and generate water vapor, and on the other hand, preheats the water in the spiral water pipe 16, making cascade utilization of the heat of the flue gas. Compared with the prior art, the flue gas never contacts the heat transfer medium water, avoiding the use of chemicals, ensuring the cleanliness of the water, and saving costs. Moreover, an activated carbon adsorption device is used during smoke exhaust, and the exhausted flue gas meets the environmental protection requirements.

[0066] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A latent heat reuse device for an oilfield heating furnace, comprising a burner, a heating furnace and a water tank. The heating furnace is installed on one side of the burner, and the water tank is installed above the heating furnace; characterized in that, The latent heat recycling device of the oilfield heating furnace also includes a recycling system and a smoke exhaust pipe, wherein one end of the heating furnace away from the burner is connected to one end of the smoke exhaust pipe, and the other end of the smoke exhaust pipe is connected to the bottom of the recycling system; The recycling system includes a processing chamber, a smoke collecting chamber and a smoke exhaust branch pipe; the processing chamber is a stepped heat transfer structure, and the processing chamber includes a heating water chamber and a preheated water chamber; the smoke collecting chamber is arranged below the processing chamber and connected to the smoke exhaust pipe, and the smoke exhaust branch pipe is connected to the smoke collecting chamber and runs through the processing chamber.

2. The latent heat reuse device of an oilfield heating furnace according to claim 1, characterized in that, The interior of the processing chamber is divided into a heating water chamber and a preheating water chamber by a partition, the heating water chamber is below the partition, and the preheating water chamber is above the partition.

3. The latent heat reuse device of an oilfield heating furnace according to claim 2, characterized in that, A plurality of spiral water pipes are spirally arranged in the preheating water chamber, the lower ends of the spiral water pipes are connected to a water outlet pipe, and the water outlet pipe passes through the partition plate and is connected to the heating water chamber.

4. The latent heat reuse device of an oilfield heating furnace according to claim 3, characterized in that, The activated carbon adsorption device is arranged on the top of the processing chamber, and the terminal of the smoke exhaust branch pipe is connected to the activated carbon adsorption device.

5. The latent heat reuse device of an oilfield heating furnace according to claim 4, characterized in that, A smoke outlet is arranged at the top of the processing chamber.

6. The latent heat reuse device of an oilfield heating furnace according to claim 5, characterized in that, The top of the processing chamber is a detachable structure.

7. The latent heat reuse device of an oilfield heating furnace according to claim 6, characterized in that, A drain pipe is provided on one side of the heating water chamber, and a valve is provided on the drain pipe.

8. The latent heat reuse device of an oilfield heating furnace according to claim 7, characterized in that, An elbow joint is provided at the bottom of the smoke exhaust branch pipe, and both ends of the elbow joint are detachably connected by flanges, and the elbow joint is an S-shaped pipe.

9. The latent heat reuse device of an oilfield heating furnace according to claim 8, characterized in that, The elbow joint is arranged between the processing chamber and the smoke collecting chamber.

10. The latent heat reuse device of an oilfield heating furnace according to claim 9, characterized in that, A plurality of inclined baffles are staggeredly arranged inside the smoke exhaust branch pipe.

11. The latent heat reuse device of an oilfield heating furnace according to claim 10, characterized in that, The length of the baffle gradually decreases from bottom to top.

12. The latent heat reuse device of an oilfield heating furnace according to claim 3, characterized in that, The latent heat recycling device of the oilfield heating furnace also includes a bracket, which is arranged above the burner, the heating furnace and the water tank; the recycling system is arranged on the bracket, and the smoke exhaust pipe passes through the bracket and is connected to the smoke collecting chamber at the bottom of the recycling system.

13. The latent heat reuse device of an oilfield heating furnace according to claim 12, characterized in that, A water tank and a steam container are also provided on the bracket, a water pump is provided in the water tank; the water tank is connected to the spiral water pipe through a water pipe; a valve is provided on the water pipe, and the heating water chamber is connected to the steam container through a steam exhaust pipe.

14. The latent heat reuse device of an oilfield heating furnace according to claim 13, characterized in that, The water tank is connected to the steam container through a steam pipe.

15. A latent heat reuse method for an oilfield heating furnace, applicable to a latent heat reuse device for an oilfield heating furnace described in any one of claims 1-14, characterized in that, The following steps are involved: S1: The burner is used to heat the heating furnace, and the smoke generated during the heating process is transported to the smoke collecting chamber at the bottom of the recycling system through the smoke exhaust pipe; The water vapor generated during the heating process enters the steam container through the steam pipe; S2: The smoke is collected in the smoke collecting chamber and dispersed into each smoke exhaust branch pipe. The smoke exhaust branch pipe runs from the bottom of the processing chamber to its upper end and is finally inserted into the activated carbon adsorption device. The smoke filtered by the activated carbon adsorption device is discharged from the smoke outlet; S3: Open the valve on the water delivery pipe, and transfer the water to be heated in the water tank to the spiral water pipe through the water delivery pipe by a water pump. When the water to be heated flows in the spiral water pipe, it is preheated by the preheating of the smoke exhaust branch pipe, and finally flows into the heating water cavity and is heated by the smoke exhaust branch pipe; S4: The hot water in the heating water chamber is discharged through the valve on the drain pipe, and the water vapor generated in the heating water chamber is collected in the steam container through the exhaust pipe.

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