Ascending pipe waste heat steam heating oil-rich condensate water recovery system

Abstract

The utility model discloses an ascending pipe waste heat steam heating oil-rich condensate water recovery system which comprises an oil-rich exchanger and a bottom plate. An exchange pipe is arranged in the rich oil exchanger, a blocking block is arranged in the exchange pipe, a bottom plate is arranged on one side of the rich oil exchanger, and a connecting pipe is arranged at the top end of the bottom plate; and a sealing structure is arranged on one side of the connecting pipe. The high-pressure condensate water tank, the low-lift condensate pump and the steam pocket are used in cooperation, the original design pressure of the high-pressure condensate water tank can be increased to the pressure of the steam pocket, condensate water of the high-pressure condensate water tank is prevented from flash evaporation, and an electric control valve and a matched valve on the top of the high-pressure condensate water tank are omitted. The lift of the condensate pump can be reduced from the original steam pocket pressure of 160-250m to 60-80m, so that when the condensate pump is used, no flash steam exists, the influence of the steam on the deaerator is avoided, the deaeration temperature is stable, flash steam pipelines are reduced, and the purchase cost of the condensate pump is also greatly reduced due to the fact that the lift of the condensate pump is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-rich heating, in particular to an oil-rich condensed water recovery system heated by waste heat steam from a riser. Background Art

[0002] Most of the original debenzening processes in domestic coking use tubular furnaces. The rich oil is heated to 175-185°C by burning coal gas and then enters the debenzening tower for debenzening. At the same time, the saturated steam is heated to above 350°C by coal gas for oil washing regeneration.

[0003] Due to the major safety hazards, large consumption of washing oil, and pollution caused by exhaust gas emissions in the process tube furnace, steam heating is now gradually used to replace it. Especially after the domestic riser waste gas waste heat recovery is widely used, the coking enterprises use the steam of this system to heat the rich oil, because the rich oil is required to be heated to above 180℃, the temperature of the saturated steam used must be higher than 185℃, and the general pressure should be above 1.4MPa. After the pressure steam heats the rich oil through the rich oil heat exchanger, it becomes condensed water with a temperature higher than 185℃ and lower than the steam saturation temperature. After passing through the steam trap, it enters the condensate tank behind. The condensate flashes in the condensate tank, and the flashed steam is sent to the deaerator of this system for deoxygenation. The flashed water is sent back to the steam drum of the riser waste heat recovery through the condensate pump.

[0004] The process is feasible and successful. However, there are some problems with the process. First, the amount of flash steam in the system is too small and unstable, and can only enter the deaerator directly, which can easily cause the pressure fluctuation of the deaerator to be too large, and even cause the safety valve of the deaerator to trip. Second, because it needs to be sent back to the drum, a condensate pump with a higher head is required for transportation. Especially when the drum pressure is set high, the condensate pump needs to be not only resistant to high temperature but also have a high head. The cost of the condensate pump rises sharply, greatly increasing the investment cost. Utility Model Content

[0005] The utility model aims to provide a riser waste heat steam heating oil-rich condensate recovery system to solve the defects of the existing heating oil-rich condensate recovery system in that the amount of flash steam in the system is too small and unstable when in use, and can only directly enter the deaerator, which easily causes the pressure fluctuation of the deaerator to be too large and because it needs to be sent back to the steam drum, a condensate pump with a higher head is required for transportation, especially when the steam drum pressure is set to a high level, the condensate pump needs to be not only resistant to high temperature but also have a high head, and the cost of the condensate pump increases sharply.

[0006] In order to solve the above-mentioned technical problems, the utility model provides the following technical solutions: a riser waste heat steam heating oil-rich condensate recovery system, comprising an oil-rich exchanger and a bottom plate; an exchange tube is arranged inside the oil-rich exchanger, a barrier block is arranged inside the exchange tube, a bottom plate is arranged on one side of the oil-rich exchanger, and a connecting pipe is arranged on the top of the bottom plate; a sealing structure is arranged on one side of the connecting pipe, a steam trap is arranged on one side of the oil-rich exchanger, and an improved structure is arranged on one side of the steam trap; the improved structure comprises a degassing tower, a high-pressure condensate tank, a low-lift condensate pump and a steam drum, and the high-pressure condensate tank is arranged on one side of the steam trap.

[0007] Preferably, a low-lift condensing pump is provided on one side of the high-pressure condensing water tank, a steam drum is provided on one side of the low-lift condensing pump, a de-gassing tower is provided at the rear end of the oil-rich exchanger, a connecting pipe is connected to the other end of the low-lift condensing pump, and an emergency drain valve is provided at the bottom end of the high-pressure condensing water tank.

[0008] Preferably, the sealing structure includes a first flange, a fixing bolt, a nut, a sealing ring, a second flange and a through groove, the first flange is arranged at one end of the connecting pipe, the second flange is arranged at one end of the high-pressure condensate tank, and a sealing ring is arranged at the middle position between the first flange and the second flange.

[0009] Preferably, one end of the fixing bolt passes through the interior of the first flange and the second flange, a nut is provided on the outer side of one end of the fixing bolt, and a through groove is provided on the inner side of the first flange and the second flange.

[0010] Preferably, the inner diameter of the through groove is greater than the outer diameter of the fixing bolt, and an insertion structure is formed between the through groove and the fixing bolt.

[0011] Preferably, an outer side of the fixing bolt is provided with an external thread, an inner side of the nut is provided with an internal thread, and a threaded connection is formed between the fixing bolt and the nut.

[0012] Preferably, two groups of fixing bolts are provided, and the two groups of fixing bolts are symmetrically distributed on both sides of the first flange.

[0013] Preferably, the sealing ring is made of rubber.

[0014] Preferably, a plurality of the barrier blocks are provided, and the plurality of barrier blocks are arranged at equal intervals inside the exchange tube.

[0015] The utility model provides a riser waste heat steam heating oil-rich condensate water recovery system, which has the following advantages:

[0016] Through the coordinated use of high-pressure condensate tanks, low-lift condensate pumps and steam drums, the original design pressure of the high-pressure condensate tank can be increased to the steam drum pressure to prevent the flashing of the condensate in the high-pressure condensate tank. Because the condensate temperature is lower than the saturated steam temperature entering the oil-rich exchanger, even if the high-pressure condensate tank is completely closed, the pressure of the high-pressure condensate tank cannot be higher than the steam inlet pressure. The safety valve tripping pressure of the original high-pressure condensate tank is increased to the steam inlet pressure, and an emergency drain valve is added to the lower part of the high-pressure condensate tank. When the liquid level of the high-pressure condensate tank is too high, the condensate can be discharged automatically. The electric regulating valve and supporting valves on the top of the high-pressure condensate tank are cancelled. The condensate pump head can be reduced from the original steam drum pressure of 160-250m to 60-80m, so that there is no flash steam when it is used, avoiding the influence of steam on the deaerator, stabilizing the deoxidation temperature, reducing the flash steam pipeline, and greatly reducing the condensate pump head.

[0017] The coordinated use of the first flange, the sealing ring and the second flange can enhance the sealing performance of the connection between the connecting pipe and the emergency drain valve, making it less likely to leak during long-term use, thereby completing the sealing work. In addition, the use of the barrier block can slow down the speed of gas flow inside, making it more effective during heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0020] Figure 3 For the utility model Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0021] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the exchange tube of the utility model;

[0022] Figure 5 It is a schematic diagram of the front view stereoscopic structure of the sealing structure of the utility model.

[0023] In the figure: 1. oil-rich exchanger; 2. exchange tube; 3. improved structure; 301. de-dust tower; 302. high-pressure condensate tank; 303. low-lift condensate pump; 304. steam drum; 4. bottom plate; 5. connecting pipe; 6. emergency drain valve; 7. steam trap; 8. sealing structure; 801. first flange; 802. fixing bolt; 803. nut; 804. sealing ring; 805. second flange; 806. through groove; 9. barrier block. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model provides a system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe, such as Figure 1-5 As shown, it includes an oil-rich exchanger 1 and a bottom plate 4; an exchange tube 2 is arranged inside the oil-rich exchanger 1, and a barrier block 9 is arranged inside the exchange tube 2; a bottom plate 4 is arranged on one side of the oil-rich exchanger 1, a connecting tube 5 is arranged at the top of the bottom plate 4, and a sealing structure 8 is arranged on one side of the connecting tube 5; a steam trap 7 is arranged on one side of the oil-rich exchanger 1, and an improved structure 3 is arranged on one side of the steam trap 7.

[0026] Specifically, in this embodiment: when heating the rich oil, the improvement of the structure 3 can make the heating effect of the rich oil better, and through the setting of the sealing structure 8, when the low-lift condensation pump 303 extracts the condensed water inside the high-pressure condensed water tank 302, there will be no leakage at the connection between the connecting pipe 5 and the high-pressure condensed water tank 302, thereby completing the sealing work.

[0027] In a further preferred embodiment of the present invention, Figure 1-5 As shown: the improved structure 3 includes a de-stressing tower 301, a high-pressure condensate water tank 302, a low-lift condensate pump 303 and a steam drum 304, the high-pressure condensate water tank 302 is arranged on one side of the steam trap 7, the low-lift condensate pump 303 is arranged on one side of the high-pressure condensate water tank 302, the steam drum 304 is arranged on one side of the low-lift condensate pump 303, the de-stressing tower 301 is arranged at the rear end of the oil-rich exchanger 1, the other end of the low-lift condensate pump 303 is connected to the connecting pipe 5, and the bottom end of the high-pressure condensate water tank 302 is arranged with an emergency drain valve 6.

[0028] Specifically, in this embodiment: when heating the rich oil, the external pipeline connects the rich oil to the rich oil exchanger 1, and then during the heat exchange, the original design pressure of the high-pressure condensed water tank 302 is increased to the pressure of the steam drum 304 to prevent the condensed water in the high-pressure condensed water tank 302 from flashing, and because the condensed water temperature is lower than the saturated steam temperature entering the rich oil exchanger 1, even if the high-pressure condensed water tank 302 is completely sealed, the pressure of the high-pressure condensed water tank 302 cannot be higher than the steam inlet pressure, and then the safety valve tripping pressure of the original high-pressure condensed water tank 302 is increased to the steam inlet pressure, and the high-pressure condensed water tank 302 is placed in the steam drum 304. An emergency drain valve 6 is added at the lower part, so that when the liquid level of the high-pressure condensate tank 302 is too high, the condensate can be automatically discharged, and the electric regulating valve and the supporting valve on the top of the high-pressure condensate tank 302 are cancelled. The head of the condensate pump can be reduced from the original drum 304 pressure of 160-250m to 60-80m, so that when it is in use, there is no flash steam, avoiding the influence of steam on the deaerator, the deoxidation temperature is stable, and the flash steam pipeline is reduced. Because the head of the condensate pump is greatly reduced, the procurement cost of the condensate pump is also greatly reduced, and the heated rich oil is discharged to the inside of the debenzening tower 301 for debenzening to complete the debenzening work.

[0029] In a further preferred embodiment of the present invention, Figure 1-5 As shown, the sealing structure 8 includes a first flange 801, a fixing bolt 802, a nut 803, a sealing ring 804, a second flange 805 and a through groove 806. The first flange 801 is arranged at one end of the connecting pipe 5, and the second flange 805 is arranged at one end of the high-pressure condensate tank 302. A sealing ring 804 is arranged at the middle position of the first flange 801 and the second flange 805. One end of the fixing bolt 802 passes through the inside of the first flange 801 and the second flange 805. A nut 803 is arranged on the outside of one end of the fixing bolt 802. The first flange 801 and the second A through groove 806 is provided on the inner side of the flange 805, and the inner diameter of the through groove 806 is larger than the outer diameter of the fixing bolt 802. An insertion structure is formed between the through groove 806 and the fixing bolt 802. An external thread is provided on the outer side of the fixing bolt 802, and an internal thread is provided on the inner side of the nut 803. A threaded connection is formed between the fixing bolt 802 and the nut 803. Two groups of fixing bolts 802 are provided, and the two groups of fixing bolts 802 are symmetrically distributed on both sides of the first flange 801. The sealing ring 804 is made of rubber. A plurality of barrier blocks 9 are provided, and the plurality of barrier blocks 9 are arranged at equal intervals inside the exchange tube 2.

[0030] Specifically, in this embodiment, before using the oil-rich exchanger 1, the sealing ring 804 is put on the outer side of one end of the connecting pipe 5. After the putting is completed, the first flange 801 and the second flange 805 are aligned. After the alignment, the first flange 801 and the second flange 805 can be fixed by using the fixing bolt 802 and the nut 803 to complete the sealing work. At this time, the use of the sealing ring 804 can prevent the connecting pipe 5 from leaking when transporting condensed water.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for recovering oil-rich condensed water by heating the waste heat steam of a riser pipe, comprising an oil-rich exchanger (1) and a bottom plate (4); Features: An exchange tube (2) is arranged inside the oil-rich exchanger (1), a barrier block (9) is arranged inside the exchange tube (2), a bottom plate (4) is arranged on one side of the oil-rich exchanger (1), and a connecting tube (5) is arranged at the top end of the bottom plate (4); A sealing structure (8) is provided on one side of the connecting pipe (5), a steam trap (7) is provided on one side of the oil-rich exchanger (1), and an improved structure (3) is provided on one side of the steam trap (7); The improved structure (3) comprises a degassing tower (301), a high-pressure condensate tank (302), a low-lift condensate pump (303) and a steam drum (304), wherein the high-pressure condensate tank (302) is arranged on one side of the steam trap (7).

2. The system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe according to claim 1, characterized in that: A low-lift condensing pump (303) is provided on one side of the high-pressure condensing water tank (302), a steam drum (304) is provided on one side of the low-lift condensing water tank (303), a degassing tower (301) is provided at the rear end of the oil-rich exchanger (1), a connecting pipe (5) is connected to the other end of the low-lift condensing water tank (303), and an emergency drain valve (6) is provided at the bottom end of the high-pressure condensing water tank (302).

3. The system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe according to claim 2, characterized in that: The sealing structure (8) comprises a first flange (801), a fixing bolt (802), a nut (803), a sealing ring (804), a second flange (805) and a through groove (806); the first flange (801) is arranged at one end of the connecting pipe (5); the second flange (805) is arranged at one end of the high-pressure condensate tank (302); and a sealing ring (804) is arranged at a middle position between the first flange (801) and the second flange (805).

4. The system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe according to claim 3, characterized in that: One end of the fixing bolt (802) passes through the interior of the first flange (801) and the second flange (805), a nut (803) is arranged on the outer side of one end of the fixing bolt (802), and a through groove (806) is opened on the inner side of the first flange (801) and the second flange (805).

5. The system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe according to claim 3, characterized in that: The inner diameter of the through groove (806) is greater than the outer diameter of the fixing bolt (802), and an insertion structure is formed between the through groove (806) and the fixing bolt (802).

6. The system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe according to claim 3, characterized in that: The outer side of the fixing bolt (802) is provided with an external thread, and the inner side of the nut (803) is provided with an internal thread, so that a threaded connection is formed between the fixing bolt (802) and the nut (803).

7. The system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe according to claim 3, characterized in that: Two groups of fixing bolts (802) are provided, and the two groups of fixing bolts (802) are symmetrically distributed on both sides of the first flange (801).

8. The system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe according to claim 3, characterized in that: The sealing ring (804) is made of rubber.

9. The system for recovering oil-rich condensed water by heating with waste heat steam from a riser pipe according to claim 1, characterized in that: A plurality of the barrier blocks (9) are provided, and the plurality of barrier blocks (9) are arranged at equal intervals inside the exchange tube (2).

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