Chemical cleaning device for walking beam furnace

Abstract

The utility model provides a chemical cleaning device for a walking beam furnace, and relates to the field of steel smelting heating furnaces. According to the device, blind plates are installed at bottom openings of two water beam stand columns of a water inlet and return double stand column; one part of the water beam stand columns are connected with a liquid inlet and return branch pipeline I, and the other part of the water beam stand columns are connected with a liquid inlet and return branch pipeline II. The chemical cleaning device further comprises an acid liquor pool, an acid pickling pump, an acid pickling solution inlet pipeline and an acid pickling solution return pipeline. The pickling tank is filled with a pickling solution; each of the pickling solution inlet pipeline and the pickling solution return pipeline is provided with a main path and two branch paths; a main path of the pickling solution inlet pipeline and a main path of the pickling solution return pipeline are connected to the acid solution pool, and two branch paths are connected to a solution inlet and return pipeline I and a solution inlet and return pipeline II respectively; and the pickling pump is arranged on a main path of the pickling solution inlet pipeline. The utility model solves the problems that the water beam and the water beam upright post of the heating furnace are easy to scale and block, and the maintenance mode of replacing equipment is long in maintenance time and high in cost.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel smelting technology, and more specifically, to a chemical cleaning device for a walking beam furnace. Background Technology

[0002] Single-regenerative walking beam furnaces are used for heating steel billets in bar rolling mills. The water beams at the bottom of the furnace are supported by multiple water beam columns. The water beams and their corresponding columns are internally connected, and the internal structure of each water beam column consists of an inner and outer pipe. Cooling water can circulate within the water beams and their corresponding columns. After years of operation, scaling and blockages can occur in the water beams and their columns, especially in the columns (due to the small diameter of the inner pipes, which makes them more prone to blockage). This can jeopardize the safe operation of the furnace's vaporization cooling system. If conventional equipment maintenance methods are used, the only options are to replace the water beam columns or all the water beams and their corresponding columns. Replacing the water beams and their columns requires removing a large amount of refractory material from the furnace bottom, resulting in long maintenance times and furnace drying time. The cost of the water beam equipment itself and the refractory materials is also very high. Utility Model Content

[0003] In response to the aforementioned technical problems of scaling and clogging easily occurring in the water beams and columns of the heating furnace, and the long maintenance time and high cost of replacing the equipment, a chemical cleaning device for a walking beam heating furnace is provided.

[0004] The technical means adopted in this utility model are as follows:

[0005] A chemical cleaning device for a walking beam furnace, wherein the vaporization cooling system of the walking beam furnace has several sets of water beam assemblies, each water beam assembly including a water beam and several water beam columns; each water beam column includes an outer pipe and an inner pipe located inside the outer pipe, the bottom of the outer pipe being open; two water beam columns located in the middle of the water beam form a double column for water inlet and outlet.

[0006] The bottom openings of the two water beam columns of the inlet and outlet water double columns are equipped with removable blind plates.

[0007] In addition to the aforementioned double inlet and outlet water columns, some of the water beam columns have bottom openings connected to inlet and outlet liquid branch pipes I, and other water beam columns have bottom openings connected to inlet and outlet liquid branch pipes II; each inlet and outlet liquid branch pipe I merges and connects to inlet and outlet liquid pipe I, and each inlet and outlet liquid branch pipe II merges and connects to inlet and outlet liquid pipe II.

[0008] The chemical cleaning device also includes an acid tank, an acid pump, an acid inlet pipeline, and an acid return pipeline; the acid tank is filled with acid.

[0009] Both the pickling solution inlet pipeline and the pickling solution return pipeline are provided with one main pipeline and two branch pipelines.

[0010] The main line of the pickling solution inlet pipeline is connected to the acid tank, and two branch lines are respectively connected to the inlet and return pipeline I and the inlet and return pipeline II; the pickling pump is installed on the main line of the pickling solution inlet pipeline; an inlet valve I is installed on the branch line of the pickling solution inlet pipeline connected to the inlet and return pipeline I, and an inlet valve II is installed on the branch line connected to the inlet and return pipeline II;

[0011] The main line of the pickling solution return pipeline is connected to the acid tank, and two branches are connected to the inlet and return pipeline I and the inlet and return pipeline II, respectively. A return valve I is installed on the branch of the pickling solution return pipeline connected to the inlet and return pipeline I, and a return valve II is installed on the branch of the pickling solution return pipeline connected to the inlet and return pipeline II.

[0012] Furthermore, a shut-off valve is provided at the bottom opening of the water beam column.

[0013] Furthermore, the liquid outlet of the pickling pump is also connected to an acid circulation pipeline, the other end of which is connected to the acid pool, and a circulation valve is installed on the acid circulation pipeline.

[0014] Furthermore, the pickling solution in the acid tank has a temperature of 50℃~60℃ and its components include a corrosion inhibitor with a concentration of 1% and hydrochloric acid with a concentration of 5%~6%; the acid tank is equipped with a soft water supply pipe for introducing softened water, which is used to add softened water to the acid tank when adjusting the concentration of the pickling solution; the acid tank is equipped with a steam supply pipe for introducing steam into the acid tank to heat the pickling solution.

[0015] Furthermore, a short pipe made of the same material as the water beam column is welded inside the acid pool.

[0016] Furthermore, the acid tank is also equipped with a drain pipe, and a drain valve is installed on the drain pipe.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The chemical cleaning device for a walking beam furnace provided by this utility model allows both inlet and outlet liquid lines I and II to serve as the inlet or outlet for the pickling solution into the water beam assembly. Combined with the branch design of pickling lines I and II, it enables arbitrary switching between forward and reverse rinsing during chemical cleaning. It also facilitates chemical cleaning of the water beams and water beam columns of the furnace at any time, preventing furnace vaporization and leakage accidents caused by severe blockage of the water beam columns. This helps extend the service life of the furnace and provides flexible maintenance, saving maintenance time and costs. Attached Figure Description

[0019] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the liquid inlet and liquid return pipelines in the chemical cleaning device for the step-type heating furnace described in this utility model.

[0021] Figure 2 This is a schematic diagram of the chemical cleaning device for the step-type heating furnace described in this utility model.

[0022] In the diagram: 1. Water beam; 2. Water beam column; 3. Inlet and return water double column; 4. Inlet and return liquid pipeline I; 5. Inlet and return liquid pipeline II; 6. Blind flange; 7. Acid tank; 8. Water beam assembly; 9. Pickling pump; 10. Acid circulation pipeline; 11. Pickling liquid inlet pipeline; 12. Inlet valve I; 13. Inlet valve II; 14. Pickling liquid return pipeline; 15. Return valve I; 16. Return valve II; 17. Soft water filling pipe; 18. Steam filling pipe; 19. Drain pipe. Detailed Implementation

[0023] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0027] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0028] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0030] Example 1

[0031] like Figure 1-2 As shown, this utility model provides a chemical cleaning device for a walking beam furnace. The vaporization cooling system of the walking beam furnace has several sets of water beam assemblies 8. Each water beam assembly 8 includes a water beam 1 and several water beam columns 2 for supporting the water beam 1. The water beam 1 and the water beam columns 2 within the water beam assembly 8 are connected, and cooling water can circulate within the water beam 1 and each water beam column 2. Each water beam column 2 includes an outer pipe and an inner pipe located inside the outer pipe, with an opening at the bottom of the outer pipe. Two water beam columns 2 located in the middle of the water beam 1 form a double-column system for water inlet and outlet, and the bottom opening of any one of the double-column systems 3 serves as a cooling water inlet to introduce cooling water into the water beam assembly, while the bottom opening of the other water beam column 2 serves as a cooling water outlet to discharge the cooling water from the water beam assembly.

[0032] The bottom openings of the two water beam columns 2 of the inlet and outlet water double column 3 are fitted with detachable blind plates 6 by screws. When the water beam assembly 8 is chemically cleaned using the chemical cleaning device described in this utility model, the blind plates 6 are installed at the bottom openings of the two water beam columns 2 of the inlet and outlet water double column 3 by screws to seal the openings.

[0033] In addition to the inlet and outlet water double columns 3, among the water beam columns 2, a portion of the water beam columns 2 have bottom openings connected to inlet and outlet liquid branch pipes I, and another portion of the water beam columns 2 have bottom openings connected to inlet and outlet liquid branch pipes II; each of the inlet and outlet liquid branch pipes I merges and connects to inlet and outlet liquid pipe I 4, and each of the inlet and outlet liquid branch pipes II merges and connects to inlet and outlet liquid pipe II 5;

[0034] The chemical cleaning device also includes an acid tank 7, an acid pump 9, an acid inlet pipe 11, and an acid return pipe 14; the acid tank 7 is filled with acid.

[0035] Both the pickling solution inlet pipe 11 and the pickling solution return pipe 14 are provided with one main line and two branch lines.

[0036] The main line of the pickling solution inlet pipeline 11 is connected to the acid tank 7, and two branch lines are respectively connected to the inlet and return pipeline I4 and the inlet and return pipeline II5; the pickling pump 9 is installed on the main line of the pickling solution inlet pipeline 11; an inlet valve I12 is installed on the branch line of the pickling solution inlet pipeline 11 connected to the inlet and return pipeline I4, and an inlet valve II13 is installed on the branch line connected to the inlet and return pipeline II5;

[0037] The main line of the pickling liquid return pipeline 14 is connected to the acid tank 7, and the two branches are connected to the inlet and return pipeline I4 and the inlet and return pipeline II5 respectively. A return valve I15 is installed on the branch of the pickling liquid return pipeline 14 connected to the inlet and return pipeline I4, and a return valve II16 is installed on the branch of the pickling liquid return pipeline 14 connected to the inlet and return pipeline II5.

[0038] Furthermore, the bottom opening of each water beam column 2 is provided with a shut-off valve. As needed, the pickling solution can be controlled to flow from each water beam column 2 into the water beam assembly for chemical cleaning by controlling the opening and closing of the shut-off valve at the bottom of each water beam column 2.

[0039] Furthermore, the liquid outlet of the pickling pump 9 is also connected to an acid circulation pipeline 10, the other end of which is connected to the acid pool 7. A circulation valve is provided on the acid circulation pipeline 10. When the inlet valve I 12, the return valve I 13, the inlet valve II 15, and the return valve II 16 are all closed, the circulation valve is opened, and the pickling pump 9 can circulate the residual pickling liquid in the pickling liquid inlet pipeline 11 back to the acid pool 7.

[0040] Furthermore, the pickling solution in the acid tank 7 has a temperature of 50℃~60℃ and its components include a corrosion inhibitor with a concentration of 1% and hydrochloric acid with a concentration of 5%~6%; the acid tank 7 is equipped with a soft water inlet pipe 17 for introducing softened water, which is used to add softened water to the acid tank 7 when adjusting the concentration of the pickling solution; the acid tank 7 is equipped with a steam inlet pipe 18 for introducing steam into the acid tank 7 to heat the pickling solution.

[0041] Furthermore, a short pipe of the same material as the water beam column 2 is welded inside the acid tank 7 to simulate the welding part inside the water beam column 2. By observing the state of the short pipe in the acid tank 7, it can be determined whether the concentration of the pickling solution will damage the welding point of the short pipe, and thus determine whether the concentration of the prepared pickling solution is appropriate, preventing the pickling solution from damaging the welding part inside the water beam column 2 during chemical cleaning.

[0042] Furthermore, the acid tank 7 is also equipped with a drain pipe 19, and a drain valve is installed on the drain pipe 19. After cleaning is completed, the drain valve is opened to drain the acid washing solution inside the acid tank 7 through the drain pipe 19.

[0043] Furthermore, it also includes a water tank and a passivation solution tank for replacing the acid tank 7; after cleaning the water beam assembly with pickling solution, the acid tank 7 is first replaced with a water tank containing softened water, and the softened water is introduced into the water beam 1 and the water beam column 2 for water rinsing using the chemical cleaning device; then the water tank is replaced with the passivation solution tank containing passivation solution, and the passivation solution is introduced into the water beam 1 and the water beam column 2 using the chemical cleaning device.

[0044] The chemical cleaning device for the walking beam furnace described in this utility model is used to clean the scale buildup on the inner walls of the water beam 1 and the water beam column 2 in the vaporization cooling system of the walking beam furnace. The cleaning circuit can switch between forward and reverse directions.

[0045] (1) Forward cleaning: Open the inlet valve I12 and return valve II16, and close the return valve I15 and inlet valve II13. Start the pickling pump 9 to pass the pickling liquid in the acid tank 7 into the inlet and return pipe I4 through the branch where the inlet valve I12 is located on the pickling liquid inlet pipe 11, thereby entering the connected water beam column 2, and then flowing through each water beam column 2 and water beam 1 in the water beam assembly 8 to clean the scale on the inner wall. Then the pickling liquid can return to the acid tank 7 through the inlet and return pipe II5 and the branch where the return valve II16 is located on the pickling liquid return pipe 14, thus completing one cycle.

[0046] (2) Reverse cleaning: Close the inlet valve I12 and the return valve II16, and open the return valve I15 and the inlet valve II13. Start the pickling pump 9 to pass the pickling liquid in the acid tank 7 into the inlet and return pipe II5 through the branch of the pickling liquid inlet pipe 11 where the inlet valve II13 is located. Then, it enters the connected water beam column 2 and flows through each water beam column 2 and water beam 1 in the water beam assembly 8 to clean the scale on the inner wall. Then, the pickling liquid can return to the acid tank 7 through the inlet and return pipe I4 and the branch of the pickling liquid return pipe 14 where the return valve I15 is located. This completes one cycle.

[0047] During chemical cleaning, the pickling solution can be circulated every half hour, and the circulation time should not exceed 8 hours. The concentration of the pickling solution can be sampled and tested in the acid tank 7 at any time. If the concentration of the pickling solution does not meet the requirements, the concentration can be adjusted by adding corrosion inhibitors, hydrochloric acid and softened water to the acid tank 7, thereby ensuring the effectiveness of chemical cleaning.

[0048] In the chemical cleaning device of this utility model, both the inlet and return liquid pipelines I4 and II5 can serve as the inlet or outlet for the pickling solution to enter the water beam assembly 8. Combined with the branch design of the pickling pipelines I11 and II14, it is possible to switch between forward and reverse rinsing at will during chemical cleaning. Furthermore, the chemical cleaning device does not change the original structure of the walking beam furnace, making it safe and reliable.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A chemical cleaning device for a walking beam furnace, wherein the walking beam furnace has several sets of water beam assemblies, each water beam assembly comprising a water beam and several water beam columns; each water beam column comprises an outer pipe and an inner pipe located inside the outer pipe, the bottom of the outer pipe being open; two water beam columns located in the middle of the water beam form a double column for water inlet and outlet; characterized in that: The bottom openings of the two water beam columns of the inlet and outlet water double columns are equipped with removable blind plates. In addition to the aforementioned double inlet and outlet water columns, some of the water beam columns have bottom openings connected to inlet and outlet liquid branch pipes I, and other water beam columns have bottom openings connected to inlet and outlet liquid branch pipes II; each inlet and outlet liquid branch pipe I merges and connects to inlet and outlet liquid pipe I, and each inlet and outlet liquid branch pipe II merges and connects to inlet and outlet liquid pipe II. The chemical cleaning device also includes an acid tank, an acid pump, an acid inlet pipeline, and an acid return pipeline; the acid tank is filled with acid. Both the pickling solution inlet pipeline and the pickling solution return pipeline are provided with one main pipeline and two branch pipelines. The main line of the pickling solution inlet pipeline is connected to the acid tank, and two branch lines are respectively connected to the inlet and return pipeline I and the inlet and return pipeline II; the pickling pump is installed on the main line of the pickling solution inlet pipeline; an inlet valve I is installed on the branch line of the pickling solution inlet pipeline connected to the inlet and return pipeline I, and an inlet valve II is installed on the branch line connected to the inlet and return pipeline II; The main line of the pickling solution return pipeline is connected to the acid tank, and two branch lines are respectively connected to the inlet and return pipeline I and the inlet and return pipeline II; a return valve I is installed on the branch line of the pickling solution return pipeline connected to the inlet and return pipeline I, and a return valve II is installed on the branch line connected to the inlet and return pipeline II.

2. The chemical cleaning device for a walking beam furnace according to claim 1, characterized in that, The bottom opening of the water beam column is equipped with a shut-off valve.

3. The chemical cleaning device for a walking beam furnace according to claim 1, characterized in that, The liquid outlet of the pickling pump is also connected to an acid circulation pipeline, the other end of which is connected to the acid pool, and a circulation valve is installed on the acid circulation pipeline.

4. The chemical cleaning apparatus for a walking beam furnace according to claim 1, characterized in that, The pickling solution in the acid tank has a temperature of 50℃ to 60℃ and consists of a 1% corrosion inhibitor and a 5% to 6% hydrochloric acid. The acid tank is equipped with a soft water supply pipe for adding softened water to the acid tank when adjusting the concentration of the pickling solution. The acid tank is also equipped with a steam supply pipe for introducing steam into the acid tank to heat the pickling solution.

5. The chemical cleaning device for a walking beam furnace according to claim 1, characterized in that, The acid tank has a short pipe welded inside, which is made of the same material as the water beam column.

6. The chemical cleaning apparatus for a walking beam furnace according to claim 1, characterized in that, The acid tank is also equipped with a drain pipe, and a drain valve is installed on the drain pipe.

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