Dead steam recovery device for deaerator of dry quenching system

Abstract

The embodiment of the utility model provides a dry quenching system deaerator dead steam recovery device which comprises a deaerator, a steam-water heat exchanger, a dead steam pipeline, a condensed water pipeline and a deoxygenated water pipeline, the deaerator comprises a deoxygenated water tank and a deoxygenated head, and the dead steam pipeline is connected with a dead steam diffusing pipeline and a first connector of a first heat exchange channel of the steam-water heat exchanger; the condensed water pipeline is connected with the first heat exchange channel second interface of the steam-water heat exchanger and the deoxygenated water tank; and the deoxygenated water pipeline is connected with the deoxygenated head after being connected in series with the second heat exchange channel of the steam-water heat exchanger. In the operation process of the dry quenching system, dead steam enters the first heat exchange channel and exchanges heat with deoxygenated water in the second heat exchange channel, so that heat of the dead steam is recycled at a time. And condensed water formed by cooling the dead steam in the first heat exchange channel enters the deoxidizing water tank through the condensed water pipeline, so that the heat of the dead steam is secondarily recycled, and the heat utilization rate in the operation process of the dry quenching system is improved. In addition, the consumption of desalted water and noise pollution can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of dry quenching coke processing technology, and in particular to a waste steam recovery device for a dry quenching coke deaerator. Background Technology

[0002] During the operation of the dry quenching system, the deaerator can use high-temperature steam to deoxygenate the demineralized water to meet the water quality requirements for the demineralized water circulating in the dry quenching system.

[0003] During the deaeration process, excess exhaust steam inside the deaerator is usually directly discharged, which can easily cause heat loss. The consumption of high-temperature steam increases during the deaeration process, leading to a decrease in the thermal efficiency of the dry quenching system. In addition, the discharge of exhaust steam will also increase the consumption of demineralized water and generate noise pollution. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a waste steam recovery device for a deaerator in a dry quenching system, so as to improve the heat utilization rate during the operation of the dry quenching system. The specific technical solution is as follows:

[0005] This application provides a waste steam recovery device for a dry quenching coke deaerator, comprising: a deaerator, including a deaerator water tank and a deaerator head, the deaerator head being disposed in the deaerator water tank, the deaerator head being provided with a waste steam vent pipe and a deaerator water inlet, the deaerator head being used to deoxygenate the deaerator water and then transport it to the deaerator water tank; a steam-water heat exchanger, including a first heat exchange channel and a second heat exchange channel for realizing heat exchange, the first heat exchange channel having a first interface and a second interface at both ends; a waste steam pipe connecting the waste steam vent pipe and the first interface; a condensate pipe connecting the second interface and the deaerator water tank; and a deaerator water pipe connected in series with the second heat exchange channel and then connected to the deaerator head.

[0006] In some embodiments, the system further includes: a demineralized water tank; the condensate pipe includes a first branch pipe and a second branch pipe; the first branch pipe is connected to the second interface of the first heat exchange channel and the deoxygenated water tank, and the first branch pipe is provided with a first condensate valve; the second branch pipe is connected to the second interface of the first heat exchange channel and the demineralized water tank, and the second branch pipe is provided with a second condensate valve.

[0007] In some embodiments, the condensate pipeline includes a main pipeline, a first end of which is connected to a second interface of the first heat exchange channel, and a second end of which is connected to a first branch pipeline and a second branch pipeline, such that the first branch pipeline is connected to the second interface of the first heat exchange channel and the deoxygenated water tank, and the second branch pipeline is connected to the second interface of the first heat exchange channel and the demineralized water tank; the main pipeline is provided with a third condensate valve.

[0008] In some embodiments, the deoxygenated water pipeline includes a first pipeline segment and a second pipeline segment; the first end of the first pipeline segment and the second pipeline segment are connected by a first heat exchange valve, and the second end of the second pipeline segment is connected to the deoxygenation head; the two ends of the second heat exchange channel have a third interface and a fourth interface, the third interface is connected to the first pipeline segment by a second heat exchange valve, and the fourth interface is connected to the second pipeline segment by a third heat exchange valve.

[0009] In some embodiments, temperature detectors are respectively provided at the first interface, the second interface, the third interface, and the fourth interface.

[0010] In some embodiments, the system further includes: a waste steam vent valve connected to the waste steam venting pipe; a pressure detector disposed in the deaerator tank for detecting the working pressure of the deaerator tank; and a controller electrically connected to the waste steam vent valve and the pressure detector for adjusting the opening and closing of the waste steam vent valve according to the working pressure.

[0011] In some embodiments, the system further includes: a waste steam inlet valve disposed in the waste steam pipeline; the controller is also electrically connected to the waste steam inlet valve and is used to adjust the opening degree of the waste steam inlet valve according to the working pressure.

[0012] In some embodiments, the controller adjusts the opening and closing of the exhaust steam valve and the opening of the exhaust steam inlet valve according to the working pressure, so as to keep the deaerator tank within a predetermined pressure range.

[0013] In some embodiments, the predetermined pressure is P, where 0.019 MPa ≤ P ≤ 0.021 MPa.

[0014] In some embodiments, it further includes: a steam pipe for deoxygenation heating, connected to the deaerator, for providing heating steam to the deaerator head.

[0015] The waste steam recovery device for a dry quenching system deaerator provided in this embodiment includes a deaerator, a steam-water heat exchanger, a waste steam pipeline, a condensate pipeline, and a deoxygenated water pipeline. The deaerator includes a deoxygenated water tank and a deoxygenation head. The deoxygenation head is disposed in the deoxygenated water tank and is provided with a waste steam venting pipeline and a deoxygenated water inlet. The deoxygenation head is used to deoxygenate the deoxygenated water and transport it to the deoxygenated water tank. The steam-water heat exchanger includes a first heat exchange channel and a second heat exchange channel for heat exchange. The first heat exchange channel has a first interface and a second interface at both ends. The waste steam pipeline connects the waste steam venting pipeline and the first interface. The condensate pipeline connects the second interface and the deoxygenated water tank. The deoxygenated water pipeline and the second heat exchange channel are connected in series and then connected to the deaerator head.

[0016] During operation of the dry quenching system, the exhaust steam discharged from the deaerator head's exhaust steam vent pipe enters the first heat exchange channel of the steam-water heat exchanger via the exhaust steam pipe. There, it exchanges heat with deaerated water entering the second heat exchange channel of the steam-water heat exchanger via the deaerated water pipe. The deaerated water absorbs the heat from the exhaust steam and heats up before entering the deaerator head for deaeration, thus achieving primary heat recovery and utilization. The condensate formed by the exhaust steam cooling in the first heat exchange channel then enters the deaerated water tank via the condensate pipe, achieving secondary heat recovery and utilization. This reduces the consumption of high-temperature steam during the deaeration process and improves the heat utilization rate of the dry quenching system. Furthermore, reducing exhaust steam emissions also reduces demineralized water consumption and noise pollution generated during exhaust steam discharge.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the structure of a deaerator exhaust steam recovery device for a dry quenching system provided in an embodiment of this application.

[0020] The attached figures are labeled as follows:

[0021] Deaerator 10, deaerated water tank 11, deaerator head 12, exhaust steam vent pipe 121, deaerated water inlet 122, steam-water heat exchanger 20, first interface 21, second interface 22, third interface 23, fourth interface 24, exhaust steam pipe 30, condensate pipe 40, first branch pipe 41, second branch pipe 42, first condensate valve 43, second condensate valve 44, main pipe 45, third condensate valve 46, deaerated water pipe 50, first pipe section 51, second pipe section 52, first heat exchange valve 53, second heat exchange valve 54, third heat exchange valve 55, demineralized water tank 60, temperature detector 70, exhaust steam vent valve 81, pressure detector 82, exhaust steam inlet valve 83, deaerated heating steam pipe 90, exhaust steam vent component 100. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art based on this application are within the protection scope of the present utility model.

[0023] In related technologies, the direct emission of exhaust steam during the operation of dry quenching systems leads to reduced thermal efficiency, increased consumption of demineralized water, and noise pollution.

[0024] The purpose of this application is to provide a waste steam recovery device for a deaerator in a dry quenching system, so as to improve the heat utilization rate during the operation of the dry quenching system.

[0025] Figure 1 A schematic diagram of the structure of a deaerator exhaust steam recovery device in a dry quenching system provided in this application embodiment is shown below. Figure 1 As shown, a deaerator exhaust steam recovery device for a dry quenching coke system includes a deaerator 10, a steam-water heat exchanger 20, an exhaust steam pipeline 30, a condensate pipeline 40, and a deoxygenated water pipeline 50.

[0026] The deaerator 10 includes a deaerator water tank 11 and a deaerator head 12. The deaerator head 12 is located in the deaerator water tank 11 and has a waste steam vent pipe 121 and a deaerator water inlet 122. The deaerator head 12 is used to deaerator the water and then transport it to the deaerator water tank 11. The steam-water heat exchanger 20 includes a first heat exchange channel and a second heat exchange channel for heat exchange. The first heat exchange channel has a first interface 21 and a second interface 22 at both ends. The waste steam pipe 30 connects the waste steam vent pipe 121 and the first interface 21. The condensate pipe 40 connects the second interface 22 and the deaerator water tank 11. The deaerator water pipe 50 is connected in series with the second heat exchange channel and then connected to the deaerator head 12.

[0027] During operation of the dry quenching system, the exhaust steam discharged from the exhaust steam vent pipe 121 of the deaerator head 12 enters the first heat exchange channel of the steam-water heat exchanger 20 via the exhaust steam pipe 30. There, it exchanges heat with deaerated water entering the second heat exchange channel of the steam-water heat exchanger 20 via the deaerated water pipe 50. The deaerated water absorbs the heat from the exhaust steam and heats up before entering the deaerator head 12 for deaeration, thus achieving primary heat recovery and utilization. The condensate formed by the exhaust steam cooling in the first heat exchange channel then enters the deaerated water tank 11 via the condensate pipe 40, achieving secondary heat recovery and utilization. This reduces the consumption of high-temperature steam during the deaeration process and improves the heat utilization rate of the dry quenching system. Furthermore, reducing exhaust steam emissions also reduces demineralized water consumption and noise pollution generated during exhaust steam discharge.

[0028] Deaerator 10 can be a low-pressure swirl film deaerator.

[0029] In some embodiments, the waste steam recovery device of the dry quenching system deaerator further includes a deaeration heating steam pipe 90, which is connected to the deaerator 10 to provide heating steam to the deaerator head 12. In practice, the deaeration heating steam pipe 90 is connected to the deaerator water tank 11 and provides heating steam to the deaerator head 12 through internal piping, heating the deaerator water in the deaerator head 12 to 104°C. Excess waste steam after deaeration enters the steam-water heat exchanger 20 via the waste steam vent pipe 121 to exchange heat with the deaerator water. After heat exchange, the waste steam is converted into condensate (approximately 90°C), which then enters the deaerator water tank 11 of the low-pressure vortex film deaerator via the condensate pipe 40.

[0030] In some embodiments, the waste steam recovery device of the deaerator in the dry quenching system further includes a demineralized water tank 60. The condensate pipeline 40 includes a first branch pipeline 41 and a second branch pipeline 42; the first branch pipeline 41 connects the second interface 22 of the first heat exchange channel and the deaerator water tank 11, and is equipped with a first condensate valve 43; the second branch pipeline 42 connects the second interface 22 of the first heat exchange channel and the demineralized water tank 60, and is equipped with a second condensate valve 44. When a pipeline fault occurs in the dry quenching system, and the condensate generated in the first heat exchange channel cannot flow into the deaerator water tank 11 through the first branch pipeline 41, the first condensate valve 43 can be closed and the second condensate valve 44 opened, allowing the condensate to flow into the demineralized water tank 60 through the second branch pipeline 42, facilitating the recovery and reuse of the condensate.

[0031] Specifically, the demineralized water tank 60 is connected to the deoxygenated water pipeline 50, and the demineralized water tank 60 provides the deoxygenated water to be deoxygenated by the deaerator 10 to the deoxygenated water pipeline 50.

[0032] To facilitate maintenance of the first branch pipe 41 and the second branch pipe 42, the condensate pipe 40 includes a main pipe 45. The first end of the main pipe 45 is connected to the second interface 22 of the first heat exchange channel, and the second end of the main pipe 45 is connected to both the first branch pipe 41 and the second branch pipe 42. This allows the first branch pipe 41 to connect to the second interface 22 of the first heat exchange channel and the deoxygenated water tank 11, and the second branch pipe 42 to connect to the second interface 22 of the first heat exchange channel and the demineralized water tank 60. The main pipe 45 is equipped with a third condensate valve 46. During maintenance of the first branch pipe 41 and the second branch pipe 42, closing the third condensate valve 46 easily shuts off condensate from entering both pipes.

[0033] The deoxygenated water pipeline 50 includes a first pipeline section 51 and a second pipeline section 52. The first ends of the first pipeline section 51 and the second pipeline section 52 are connected by a first heat exchange valve 53, and the second end of the second pipeline section 52 is connected to the deoxygenation head 12. The second heat exchange channel has a third interface 23 and a fourth interface 24 at both ends. The third interface 23 is connected to the first pipeline section 51 by a second heat exchange valve 54, and the fourth interface 24 is connected to the second pipeline section 52 by a third heat exchange valve 55. When the exhaust steam entering the first heat exchange channel of the steam-water heat exchanger 20 needs to exchange heat with the deoxygenated water entering the second heat exchange channel of the steam-water heat exchanger 20, the first heat exchange valve 53 can be closed, and the second heat exchange valve 54 and the third heat exchange valve 55 can be opened. When the deoxygenated water entering the second heat exchange channel of the steam-water heat exchanger 20 does not need to exchange heat with the exhaust steam entering the first heat exchange channel of the steam-water heat exchanger 20, the first heat exchange valve 53 can be opened, and the second heat exchange valve 54 and the third heat exchange valve 55 can be closed, making it convenient to use.

[0034] Temperature detectors 70 are installed at the first interface 21, the second interface 22, the third interface 23, and the fourth interface 24. The temperature detectors 70 allow for easy monitoring of the temperatures at the four interfaces of the steam-water heat exchanger 20, thus enabling the determination of whether the heat exchanger 20 is operating normally and providing insight into its operational status.

[0035] The waste steam recovery device of the deaerator in the dry quenching system also includes a waste steam vent valve 81, a pressure detector 82, and a controller. The waste steam vent valve 81 is connected to the waste steam venting pipe 121; the pressure detector 82 is installed in the deaerator water tank 11 to detect the working pressure of the deaerator water tank 11; the controller is electrically connected to the waste steam vent valve 81 and the pressure detector 82, and the controller is used to adjust the opening and closing of the waste steam vent valve 81 according to the working pressure. When the working pressure of the deaerator water tank 11 is too high, the controller can open the waste steam vent valve 81, and the waste steam is discharged through the waste steam vent valve 81 to relieve the pressure inside the deaerator water tank 11, so that the working pressure of the deaerator water tank 11 is maintained under a suitable pressure environment.

[0036] The waste steam recovery device of the deaerator in the dry quenching system also includes a waste steam inlet valve 83, which is installed in the waste steam pipeline 30. The controller is also electrically connected to the waste steam inlet valve 83 and is used to adjust the opening of the waste steam inlet valve 83 according to the working pressure. When the working pressure of the deaerator water tank 11 is too high, the controller can also reduce the opening of the waste steam inlet valve 83, thereby reducing the amount of waste steam returning to the deaerator water tank 11 through the steam-water heat exchanger 20, so as to maintain the working pressure of the deaerator water tank 11 under a suitable pressure environment.

[0037] Among them, the exhaust steam valve 81 and the exhaust steam inlet valve 83 can be electric valves to facilitate electrical control by the controller. The controller interlocks the exhaust steam valve 81 and the exhaust steam inlet valve 83 with the working pressure transmitted remotely by the pressure detector 82 on the deaerator tank 11, thereby maintaining the deaerator 10 in a suitable predetermined pressure environment.

[0038] The controller adjusts the opening and closing of the exhaust steam valve 81 and the opening of the exhaust steam inlet valve 83 according to the working pressure to keep the deaerator tank 11 within a predetermined pressure range. The predetermined pressure is P, where 0.019MPa≤P≤0.021MPa, for example, P is 0.02MPa.

[0039] When the pressure inside the deaerator 10 increases, open the electric shut-off valve on the exhaust steam venting pipe 121 and close the electric shut-off valve at the inlet of the steam-water heat exchanger 20.

[0040] In some embodiments, the steam-water heat exchanger 20 has a waste steam venting component 100 connected to the first heat exchange channel. When the steam-water heat exchanger 20 is under maintenance, the third condensate valve 46, the second heat exchange valve 54, the third heat exchange valve 55 and the waste steam inlet valve 83 can be shut off, and the waste steam venting component 100 can be opened to vent the steam in the first heat exchange channel of the steam-water heat exchanger 20 in order to accelerate the cooling.

[0041] The embodiments of this solution have at least the following advantages:

[0042] (1) The waste steam recovery device of the deaerator in the dry quenching system can effectively recover the energy of the waste steam released from the waste steam venting pipeline and increase the feed water temperature of the deaerator water pipeline.

[0043] (2) The waste steam recovery device of the deaerator in the dry quenching system can reduce the consumption of steam for deaeration heating in the deaerator.

[0044] (3) The deaerator exhaust steam recovery device of the dry quenching system can recover the condensate converted from the exhaust steam after heat exchange by the steam-water heat exchanger, thereby reducing the consumption of demineralized water in the dry quenching system.

[0045] (4) The waste steam recovery device of the dry quenching system deaerator can effectively stabilize the working pressure inside the deaerator, so that the deaerator maintains a good deoxygenation effect.

[0046] (5) The deaerator exhaust steam recovery device of the dry quenching system can reduce the excessive noise and environmental pollution caused by the exhaust steam of the deaerator.

[0047] (6) The waste steam recovery device of the deaerator in the dry quenching system can improve the thermal efficiency of the dry quenching system and save operating costs.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A waste steam recovery device for a deaerator in a dry quenching system, characterized in that, include: The deaerator (10) includes a deaerator water tank (11) and a deaerator head (12). The deaerator head (12) is located in the deaerator water tank (11). The deaerator head (12) is provided with a waste steam vent pipe (121) and a deaerator water inlet (122). The deaerator head (12) is used to deaerator the deaerator water and then transport it to the deaerator water tank (11). The steam-water heat exchanger (20) includes a first heat exchange channel and a second heat exchange channel for realizing heat exchange, and the two ends of the first heat exchange channel have a first interface (21) and a second interface (22). Exhaust steam pipe (30) connects the exhaust steam vent pipe (121) and the first interface (21); Condensate pipe (40) connects the second interface (22) and the deoxygenated water tank (11); The deoxygenated water pipe (50) is connected in series with the second heat exchange channel and then connected to the deoxygenation head (12).

2. The waste steam recovery device for the deaerator of the dry quenching system according to claim 1, characterized in that, Also includes: Demineralized water tank (60); The condensate pipe (40) includes a first branch pipe (41) and a second branch pipe (42); The first branch pipe (41) is connected to the second interface (22) of the first heat exchange channel and the deoxygenated water tank (11). The first branch pipe (41) is equipped with a first condensate valve (43). The second branch pipe (42) connects the second interface (22) of the first heat exchange channel and the demineralized water tank (60), and the second branch pipe (42) is equipped with a second condensate valve (44).

3. The waste steam recovery device for the deaerator of the dry quenching system according to claim 2, characterized in that, The condensate pipe (40) includes a main pipe (45), the first end of the main pipe (45) is connected to the second interface (22) of the first heat exchange channel, and the second end of the main pipe (45) is connected to the first branch pipe (41) and the second branch pipe (42) respectively, so that the first branch pipe (41) is connected to the second interface (22) of the first heat exchange channel and the deoxygenated water tank (11), and the second branch pipe (42) is connected to the second interface (22) of the first heat exchange channel and the demineralized water tank (60). The main pipeline (45) is equipped with a third condensate valve (46).

4. The waste steam recovery device for the deaerator of the dry quenching system according to claim 1, characterized in that, The deoxygenated water pipeline (50) includes a first pipeline section (51) and a second pipeline section (52); The first end of the first pipe section (51) and the second pipe section (52) are connected by a first heat exchange valve (53), and the second end of the second pipe section (52) is connected to the deaerator head (12). The second heat exchange channel has a third interface (23) and a fourth interface (24) at both ends. The third interface (23) is connected to the first pipe section (51) through a second heat exchange valve (54), and the fourth interface (24) is connected to the second pipe section (52) through a third heat exchange valve (55).

5. The waste steam recovery device for the deaerator of the dry quenching system according to claim 4, characterized in that, Temperature detectors (70) are respectively installed at the first interface (21), the second interface (22), the third interface (23), and the fourth interface (24).

6. The waste steam recovery device for the deaerator of the dry quenching system according to claim 1, characterized in that, Also includes: Exhaust steam vent valve (81) is connected to the exhaust steam venting pipe (121); A pressure detector (82) is installed in the deoxygenated water tank (11) to detect the working pressure of the deoxygenated water tank (11); The controller is electrically connected to the exhaust steam valve (81) and the pressure detector (82) and is used to adjust the opening and closing of the exhaust steam valve (81) according to the working pressure.

7. The waste steam recovery device for the deaerator of the dry quenching system according to claim 6, characterized in that, Also includes: A waste steam inlet valve (83) is installed in the waste steam pipeline (30); The controller is also electrically connected to the exhaust steam inlet valve (83) for adjusting the opening degree of the exhaust steam inlet valve (83) according to the working pressure.

8. The waste steam recovery device for the deaerator of the dry quenching system according to claim 7, characterized in that, The controller adjusts the opening and closing of the exhaust steam valve (81) and the opening of the exhaust steam inlet valve (83) according to the working pressure so that the deaerator tank (11) is kept within a predetermined pressure range.

9. The waste steam recovery device for the deaerator of the dry quenching system according to claim 8, characterized in that, The predetermined pressure is P, where 0.019MPa≤P≤0.021MPa.

10. The waste steam recovery device for the deaerator of the dry quenching system according to claim 1, characterized in that, Also includes: A steam pipe (90) for deoxygenation heating is connected to the deaerator (10) to provide heating steam to the deaerator head (12).

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