An on-line backflushing device and method for an electroslag furnace heat exchanger

Abstract

The application relates to the technical field of heat exchange, and discloses an electric-shock furnace heat exchanger online backflushing device and method, which comprises a heat exchanger body, a water tank, a crystallizer, a secondary water inlet pipe, a secondary water return pipe, a first intermediate pipe, a second intermediate pipe and a plurality of valves. The electric-shock furnace heat exchanger online backflushing device can change the opening and closing of different valves to reversely flush the residual deposits in the heat exchanger body, so that the residual deposits can be discharged from the sixth valve or the tenth valve along with the flushing liquid, and the operation is simple and convenient. Therefore, the residual deposits in the heat exchanger can be efficiently cleaned.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and in particular to an online backflushing device and method for an electroslag furnace heat exchanger. Background Technology

[0002] The heat exchanger of the electroslag furnace has a good effect on cooling high-temperature fluids. By adjusting the inlet water flow rate of the heat exchanger, the room temperature of the internal circulating water can be controlled to avoid the return water temperature being too high or too low, which would affect the surface quality of the steel ingot.

[0003] Over time, deposits accumulate on the surface of the heat exchange fins inside the heat exchanger. To ensure heat exchange efficiency, these deposits need to be cleaned periodically. In existing technologies, the heat exchange fins must be removed and cleaned piece by piece during the disassembly and cleaning process, which is inefficient, time-consuming, and labor-intensive.

[0004] Therefore, how to efficiently clean the residual deposits in heat exchangers has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide an online backflushing device and method for an electroslag furnace heat exchanger, which can efficiently clean residual precipitates in the heat exchanger.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An online backflushing device for an electroslag furnace heat exchanger includes: a heat exchanger body, a water tank, a crystallizer, a secondary water inlet pipe, and a secondary water return pipe; wherein, the heat exchanger body has a cold water inlet, a cold water outlet, a hot water inlet, and a hot water outlet; the secondary water inlet pipe is connected to the cold water inlet via a first pipeline, and a first valve, a third valve, and a sixth valve are sequentially arranged on the first pipeline along the direction from the secondary water inlet pipe to the cold water inlet; the secondary water return pipe is connected to the cold water outlet via a second pipeline, and a second valve and a fourth valve are sequentially arranged on the second pipeline along the direction from the secondary water return pipe to the cold water outlet; the online backflushing device for the electroslag furnace heat exchanger also includes a first intermediate pipeline, the first end of which is connected to the first pipeline and located between the first valve and the third valve; the second end of the intermediate pipeline is connected to the first... The first intermediate pipe is connected to the second valve and located between the second and fourth valves; a fifth valve is provided on the first intermediate pipe; the online backflushing device of the electroslag furnace heat exchanger also includes a third pipe, in which the water tank and the crystallizer are sequentially arranged and interconnected; the end of the water tank away from the crystallizer is connected to the hot water outlet through the fourth pipe, and a seventh valve is provided on the fourth pipe; the end of the crystallizer away from the water tank is connected to the hot water inlet through the fifth pipe, and an eighth valve and a tenth valve are sequentially provided on the fifth pipe from the crystallizer to the hot water inlet; the online backflushing device of the electroslag furnace heat exchanger also includes a second intermediate pipe, the first end of which is connected to the fourth pipe and located between the seventh valve and the hot water outlet; the second end of the intermediate pipe is connected to the fifth pipe and located between the eighth valve and the crystallizer; a ninth valve is provided on the second intermediate pipe.

[0008] When the electroslag furnace is running, valves five, nine, six, and ten are closed, while the remaining valves are open, and the heat exchanger body performs heat exchange normally.

[0009] When it is necessary to clean the residual sediment in the heat exchanger body, the second, third, seventh, and eighth valves can be closed, and the remaining valves can be opened.

[0010] Thus, on the cold water side of the heat exchanger body: the liquid flows into the first pipeline from the secondary water inlet pipe, flows into the first intermediate pipeline through the first valve, then flows into the second pipeline through the fifth valve, then flows into the heat exchanger body from the cold water outlet through the fourth valve, then flows out of the cold water inlet to the first pipeline, and finally is discharged through the sixth valve.

[0011] On the hot water side of the heat exchanger body: the liquid flows out of the water tank on the third pipe, flows through the crystallizer and then into the fifth pipe, then through the ninth valve into the fourth pipe, then into the heat exchanger body from the hot water outlet, then out of the hot water inlet into the fifth pipe, and finally out through the tenth valve.

[0012] This online backflushing device for electroslag furnace heat exchangers can backflush residual precipitates in the heat exchanger body by changing the opening and closing of valves, so that the residual precipitates can be discharged with the flushing liquid through the sixth or tenth valve. The operation is simple and convenient; therefore, it can efficiently clean residual precipitates in the heat exchanger.

[0013] Optionally, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, and the sixth valve constitute a secondary water backwash control mechanism; the secondary water backwash control mechanism has a working state and a cleaning state; when the secondary water backwash control mechanism is in the working state: the fifth valve and the sixth valve are closed, and the first valve, the second valve, the third valve, and the fourth valve are all open; when the secondary water backwash control mechanism is in the cleaning state: the second valve and the third valve are closed, and the first valve, the fourth valve, and the fifth valve are all open.

[0014] Optionally, the seventh valve, the eighth valve, the ninth valve, and the tenth valve constitute a primary water backwash control mechanism; the primary water backwash control mechanism has a working state and a cleaning state; when the primary water backwash control mechanism is in the working state: the ninth valve and the tenth valve are closed, and the seventh valve and the eighth valve are both open; when the secondary water backwash control mechanism is in the cleaning state: the seventh valve and the eighth valve are closed, and the ninth valve is open.

[0015] Optionally, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, and the sixth valve are all solenoid valves.

[0016] Optionally, the sixth valve has a manual switch.

[0017] Optionally, the seventh, eighth, ninth, and tenth valves are all solenoid valves.

[0018] Optionally, the tenth valve has a manual switch.

[0019] An online backflushing method for an electroslag furnace heat exchanger, applicable to any of the above-mentioned online backflushing devices for electroslag furnace heat exchangers, is capable of cleaning sediments on both the cold water side and the hot water side of the heat exchanger body.

[0020] The cleaning steps for the cold water side include:

[0021] Step S101: Close the second and third valves, and open the first, fourth, fifth and sixth valves until the liquid containing residual precipitate is discharged through the sixth valve;

[0022] Step S102: Close the sixth valve, and after a preset time, open the sixth valve again;

[0023] Step S103: Repeat step S102 until the liquid discharged from the sixth valve is clear.

[0024] Optionally, the cleaning steps for the hot water side include:

[0025] Step S201: Close the seventh and eighth valves, and open the ninth and tenth valves until the liquid containing residual precipitate is discharged through the tenth valve;

[0026] Step S202: Close the tenth valve, and after a preset time, open the tenth valve again;

[0027] Step S203: Repeat step S202 until the liquid discharged from the tenth valve is clear.

[0028] Optionally, the preset time range is 5s-15s. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0030] Figure 1 This is a schematic diagram of the structure of the online backflushing device for an electroslag furnace heat exchanger provided in an embodiment of the present invention;

[0031] Figure 2 A flowchart illustrating the cleaning steps of the cold water side of the heat exchanger in the online backflushing method for the electroslag furnace heat exchanger provided in this embodiment of the invention;

[0032] Figure 3 The flowchart illustrates the cleaning steps of the hot water side of the heat exchanger in the online backflushing method for an electroslag furnace heat exchanger provided in this embodiment of the invention.

[0033] Icons: 1-First valve; 2-Second valve; 3-Third valve; 4-Fourth valve; 5-Fifth valve; 6-Sixth valve; 7-Seventh valve; 8-Eighth valve; 9-Ninth valve; 10-Tenth valve; 11-First pipeline; 12-Second pipeline; 13-Third pipeline; 14-Fourth pipeline; 15-Fifth pipeline; 16-Heat exchanger body; 17-Water tank; 18-Crystallizer; 19-Secondary water inlet pipe; 20-Secondary water return pipe; 21-First intermediate pipeline; 22-Second intermediate pipeline; 23-Cold water inlet; 24-Cold water outlet; 25-Hot water inlet; 26-Hot water outlet. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0035] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0036] Figure 1 This is a schematic diagram of the structure of the online backflushing device for an electroslag furnace heat exchanger provided in an embodiment of the present invention, as shown below. Figure 1As shown, this embodiment of the invention provides an online backflushing device for an electroslag furnace heat exchanger, comprising: a heat exchanger body 16, a water tank 17, a crystallizer 18, a secondary water inlet pipe 19, and a secondary water return pipe 20; wherein, the heat exchanger body 16 has a cold water inlet 23, a cold water outlet 24, a hot water inlet 25, and a hot water outlet 26; the secondary water inlet pipe 19 is connected to the cold water inlet 23 through a first pipe 11, and the first pipe 11 extends from the secondary water inlet pipe 19 to the cold water inlet 23. The direction is sequentially provided with a first valve 1, a third valve 3, and a sixth valve 6; the secondary water return pipe 20 is connected to the cold water outlet 24 through the second pipe 12, and the second pipe 12 is sequentially provided with a second valve 2 and a fourth valve 4 along the direction from the secondary water return pipe 20 to the cold water outlet 24; the online backflushing device of the electroslag furnace heat exchanger also includes a first intermediate pipe 21, the first end of the first intermediate pipe 21 is connected to the first pipe 11 and is located between the first valve 1 and the third valve 3; the intermediate pipe's first... The first intermediate pipeline 21 is equipped with a fifth valve 5 and is connected to the second pipeline 12 at both ends. The online backflushing device of the electroslag furnace heat exchanger also includes a third pipeline 13, in which the water tank 17 and the crystallizer 18 are sequentially arranged and interconnected. The end of the water tank 17 away from the crystallizer 18 is connected to the hot water outlet 26 through the fourth pipeline 14, and a seventh valve 7 is provided on the fourth pipeline 14. The end of the crystallizer 18 away from the water tank 17 is connected to the hot water outlet 26 through the fifth pipeline 15. The hot water inlet 25 is connected, and an eighth valve 8 and a tenth valve 10 are sequentially provided along the crystallizer 18 to the hot water inlet 25 on the fifth pipeline 15; the online backflushing device of the electroslag furnace heat exchanger also includes a second intermediate pipeline 22, the first end of which is connected to the fourth pipeline 14 and located between the seventh valve 7 and the hot water outlet 26; the second end of the intermediate pipeline is connected to the fifth pipeline 15 and located between the eighth valve 8 and the crystallizer 18; a ninth valve 9 is provided on the second intermediate pipeline 22.

[0037] In this embodiment, when the electroslag furnace is running, the fifth valve 5, the ninth valve 9, the sixth valve 6, and the tenth valve 10 are closed, while the remaining valves are open, and the heat exchanger body 16 performs heat exchange normally.

[0038] When it is necessary to clean the residual sediment in the heat exchanger body 16, the second valve 2, the third valve 3, the seventh valve 7 and the eighth valve 8 can be closed, and the remaining valves can be opened.

[0039] Thus, on the cold water side of the heat exchanger body 16: the liquid flows into the first pipeline 11 from the secondary water inlet pipe 19, flows into the first intermediate pipeline 21 through the first valve 1, then flows into the second pipeline 12 through the fifth valve 5, then flows into the heat exchanger body 16 from the cold water outlet 24 through the fourth valve 4, then flows out to the first pipeline 11 through the cold water inlet 23, and finally is discharged through the sixth valve 6.

[0040] On the hot water side of the heat exchanger body 16: the liquid flows out from the water tank 17 on the third pipe 13, flows through the crystallizer 18 and then into the fifth pipe 15, then flows into the fourth pipe 14 through the ninth valve 9, then into the heat exchanger body 16 through the hot water outlet 26, then flows out to the fifth pipe 15 through the hot water inlet 25, and finally is discharged through the tenth valve 10.

[0041] This online backflushing device for electroslag furnace heat exchangers can backflush residual precipitates in the heat exchanger body 16 by changing the opening and closing of the valves, so that the residual precipitates can be discharged with the flushing liquid through the sixth valve 6 or the tenth valve 10. The operation is simple and convenient; therefore, it can efficiently clean residual precipitates in the heat exchanger.

[0042] refer to Figure 1 Specifically, as an optional embodiment, the first valve 1, the second valve 2, the third valve 3, the fourth valve 4, the fifth valve 5, and the sixth valve 6 constitute a secondary water backwash control mechanism; the secondary water backwash control mechanism has a working state and a cleaning state; when the secondary water backwash control mechanism is in the working state: the fifth valve 5 and the sixth valve 6 are closed, and the first valve 1, the second valve 2, the third valve 3, and the fourth valve 4 are all open; when the secondary water backwash control mechanism is in the cleaning state: the second valve 2 and the third valve 3 are closed, and the first valve 1, the fourth valve 4, and the fifth valve 5 are all open.

[0043] In this embodiment, the switching between working and cleaning states of the secondary water backwash control mechanism can be achieved simply by adjusting the on / off state of each valve, thereby adapting to different needs.

[0044] Continue to refer to Figure 1 Specifically, as an optional embodiment, the seventh valve 7, the eighth valve 8, the ninth valve 9, and the tenth valve 10 constitute a primary water backwash control mechanism; the primary water backwash control mechanism has a working state and a cleaning state; when the primary water backwash control mechanism is in the working state: the ninth valve 9 and the tenth valve 10 are closed, and the seventh valve 7 and the eighth valve 8 are both open; when the secondary water backwash control mechanism is in the cleaning state: the seventh valve 7 and the eighth valve 8 are closed, and the ninth valve 9 is open.

[0045] Similarly, in this embodiment, the switching between working and cleaning states of the primary water backwash control mechanism can be achieved simply by adjusting the on / off state of each valve, thereby adapting to different needs.

[0046] It should be noted that the primary water backwash control mechanism and the secondary water backwash control mechanism can be switched to the cleaning state simultaneously, or they can be used for cleaning separately. The specific operation can be determined according to actual needs and is not limited.

[0047] Specifically, as an optional embodiment, the first valve 1, the second valve 2, the third valve 3, the fourth valve 4, the fifth valve 5, and the sixth valve 6 are all solenoid valves. The sixth valve 6 has a manual switch.

[0048] In this embodiment, the solenoid valve makes it easier to control the opening and closing states of multiple valves, thereby further improving the efficiency of the secondary water backwashing device in switching between working and flushing states.

[0049] In addition, a manual switch is added to the sixth valve 6. When cleaning the cold water side of the heat exchanger, the sixth valve 6 can be manually closed and then manually opened again. This process is repeated several times to ensure that the liquid thoroughly rinses away any remaining sediment in the cold water side of the heat exchanger. Since only one valve, the sixth valve 6, needs to be manually opened and closed, the manual repeated opening and closing method is more convenient and simple to operate compared to the electric drive method, and it also saves on drive costs.

[0050] Specifically, as an optional embodiment, the seventh valve 7, the eighth valve 8, the ninth valve 9, and the tenth valve 10 are all solenoid valves. The tenth valve 10 has a manual switch.

[0051] In this embodiment, similarly, the solenoid valve configuration makes it easier to control the opening and closing states of multiple valves, thereby further improving the efficiency of the primary water backwashing device in switching between working and flushing states.

[0052] In addition, adding a manual switch to the tenth valve 10 has the same beneficial effects as adding a manual switch to the sixth valve 6, namely, convenient operation and reduced driving costs, which will not be elaborated here.

[0053] This invention also provides an online backflushing method for an electroslag furnace heat exchanger, applicable to any of the above-mentioned online backflushing devices for electroslag furnace heat exchangers, capable of cleaning sediments on the cold water side and hot water side of the heat exchanger body 16;

[0054] Figure 2 This is a flowchart illustrating the cleaning steps of the cold water side of the heat exchanger in the online backflushing method for an electroslag furnace heat exchanger provided in this embodiment of the invention; as shown. Figure 2 As shown, specifically, the cleaning steps for the cold water side include:

[0055] Step S101: Close the second valve 2 and the third valve 3, and open the first valve 1, the fourth valve 4, the fifth valve 5 and the sixth valve 6 until the liquid containing residual precipitate is discharged from the sixth valve 6;

[0056] Step S102: Close the sixth valve 6, and after a preset time, open the sixth valve 6.

[0057] Step S103: Repeat step S102 until the liquid discharged from the sixth valve 6 is clear.

[0058] In this embodiment, the purpose of step S102 is to increase the pressure in the cold water side pipeline of the heat exchanger body 16, so as to better flush away the residual sediment; and repeating step S102 is to repeatedly flush the cold water side pipeline under high pressure to further improve the flushing efficiency.

[0059] Figure 3 This is a flowchart illustrating the cleaning steps of the hot water side of the heat exchanger in the online backflushing method for an electroslag furnace heat exchanger provided in an embodiment of the present invention, as shown below. Figure 3 As shown, specifically, as an optional embodiment, the cleaning steps on the hot water side include:

[0060] Step S201: Close the seventh valve 7 and the eighth valve 8, and open the ninth valve 9 and the tenth valve 10 until the liquid containing residual precipitate is discharged from the tenth valve 10.

[0061] Step S202: Close the tenth valve 10, and after a preset time, open the tenth valve 10 again;

[0062] Step S203: Repeat step S202 until the liquid discharged from the tenth valve 10 is clear.

[0063] In this embodiment, similarly, the purpose of step S202 is to increase the pressure in the hot water side pipeline of the heat exchanger body 16, so as to better flush away the residual sediment; and repeating step S202 is also to repeatedly flush the hot water side pipeline under high pressure to further improve the flushing efficiency.

[0064] As an optional embodiment, the preset time ranges from 5s to 15s.

[0065] In this embodiment, the preset time range is only for illustrative purposes, for example, it can be selected as 10s; in actual cleaning, the preset time can be determined by the operator according to the actual working conditions or the operator's habits, without specific limitation, as long as the discharged liquid can be clarified by opening and closing the sixth valve 6 or the tenth valve 10 multiple times.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electric-shock furnace heat exchanger online backflushing device, characterized in that, The device comprises a heat exchanger body, a water tank, a crystallizer, a secondary water inlet pipe and a secondary water return pipe. The heat exchanger body has a cold water inlet, a cold water outlet, a hot water inlet and a hot water outlet. The secondary water inlet pipe is connected to the cold water inlet through a first pipe, and the first pipe is provided with a first valve, a third valve and a sixth valve in sequence along the direction from the secondary water inlet pipe to the cold water inlet. The secondary water return pipe is connected to the cold water outlet through a second pipe, and the second pipe is provided with a second valve and a fourth valve in sequence along the direction from the secondary water return pipe to the cold water outlet. The device further comprises a first intermediate pipe, the first end of which is connected to the first pipe and located between the first valve and the third valve, and the second end of which is connected to the second pipe and located between the second valve and the fourth valve. The device further comprises a third pipe, and the water tank and the crystallizer are arranged in sequence in the third pipe and connected to each other. The end of the water tank away from the crystallizer is connected to the hot water outlet through a fourth pipe, and the fourth pipe is provided with a seventh valve. The end of the crystallizer away from the water tank is connected to the hot water inlet through a fifth pipe, and the fifth pipe is provided with an eighth valve and a tenth valve in sequence along the direction from the crystallizer to the hot water inlet. The device further comprises a second intermediate pipe, the first end of which is connected to the fourth pipe and located between the seventh valve and the hot water outlet, and the second end of which is connected to the fifth pipe and located between the eighth valve and the crystallizer. The first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve constitute a secondary water backflushing control mechanism. The secondary water backflushing control mechanism has a working state and a cleaning state. When the secondary water backflushing control mechanism is in the working state, the fifth valve and the sixth valve are closed, and the first valve, the second valve, the third valve and the fourth valve are opened. When the secondary water backflushing control mechanism is in the cleaning state, the second valve and the third valve are closed, and the first valve, the fourth valve and the fifth valve are opened. The seventh valve, the eighth valve, the ninth valve and the tenth valve constitute a primary water backflushing control mechanism. The primary water backflushing control mechanism has a working state and a cleaning state. When the primary water backflushing control mechanism is in the working state, the ninth valve and the tenth valve are closed, and the seventh valve and the eighth valve are opened. When the secondary water backflushing control mechanism is in the cleaning state, the seventh valve and the eighth valve are closed, and the ninth valve is opened. ​ 2. The EAF heat exchanger backflushing device of claim 1, wherein, The first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are all solenoid valves.

3. The EAF heat exchanger backflushing device of claim 2, wherein, The sixth valve has a manual switch.

4. The EAF heat exchanger backflushing device of claim 1, wherein, The seventh valve, the eighth valve, the ninth valve and the tenth valve are all solenoid valves.

5. The EAF heat exchanger online backflush device of claim 4, wherein, The tenth valve has a manual switch.

6. An ESR heat exchanger online backflushing method, suitable for use in an ESR heat exchanger online backflushing device as claimed in any one of claims 1-5, characterized in that, The cold water side and the hot water side of the heat exchanger body can be cleaned of sediments. The cleaning of the cold water side includes: Step S101, the second valve and the third valve are closed, the first valve, the fourth valve, the fifth valve and the sixth valve are opened, until the liquid containing residual sediments is discharged by the sixth valve; Step S102, the sixth valve is closed, after a preset time, the sixth valve is opened again; Step S103, the step of step S102 is repeated until the liquid discharged by the sixth valve is clear.

7. The EAF heat exchanger online backflush method of claim 6, wherein, The cleaning of the hot water side includes: Step S201, the seventh valve and the eighth valve are closed, the ninth valve and the tenth valve are opened, until the liquid containing residual sediments is discharged by the tenth valve; Step S202, the tenth valve is closed, after a preset time, the tenth valve is opened again; Step S203, the step of step S202 is repeated until the liquid discharged by the tenth valve is clear.

8. The EAF heat exchanger online backflush method of claim 6 or 7, wherein, The preset time ranges from 5s to 15s.

Images