Drain valve cleaning system and steam heating equipment

Abstract

The utility model discloses a drain valve cleaning system and steam heating equipment, and the drain valve cleaning system comprises a first pipeline, a first shutoff valve, a drain valve, a second shutoff valve, a second pipeline, a third shutoff valve, a third pipeline and a fourth shutoff valve; the first shutoff valve, the drain valve and the second shutoff valve are sequentially arranged on the first pipeline in the flowing direction of liquid in the first pipeline. The first pipeline between the drain valve and the second shutoff valve is communicated with one end of the second pipeline, and the third shutoff valve is arranged on the second pipeline; the first pipeline between the drain valve and the first shutoff valve is communicated with one end of the third pipeline, and the fourth shutoff valve is arranged on the third pipeline. According to the scheme provided by the invention, cleaning can be completed without dismounting the drain valve in the whole cleaning process, the cleaning process is simple and convenient, and the cleaning time is effectively saved.

Description

Technical Field

[0001] The present application relates to the technical field of steam, and in particular to a steam trap cleaning system and a steam heating device. Background Art

[0002] A steam trap is a valve used in steam pipe networks and equipment that can automatically discharge condensed water, air and other non-condensable gases and prevent steam leakage.

[0003] During the use of the steam trap in the related art, the steam trap needs to be cleaned regularly, and the cleaning process is cumbersome, time-consuming and labor-intensive. Utility Model Content

[0004] In view of the above problems, the present application provides a steam trap cleaning system and a steam heating device, which can solve the problem that the cleaning process of the steam trap is cumbersome, time-consuming and labor-intensive.

[0005] To solve the above technical problems, in a first aspect, the present application proposes a steam trap cleaning system, comprising: a first pipeline, a first shut-off valve, a steam trap, a second shut-off valve, a second pipeline, a third shut-off valve, a third pipeline and a fourth shut-off valve;

[0006] The first shut-off valve, the steam trap and the second shut-off valve are sequentially arranged in the first pipeline along the liquid flow direction in the first pipeline;

[0007] The first pipeline between the steam trap and the second shut-off valve is connected to one end of the second pipeline, and the third shut-off valve is arranged on the second pipeline;

[0008] The first pipeline between the steam trap and the first shut-off valve is communicated with one end of the third pipeline, and the fourth shut-off valve is disposed on the third pipeline.

[0009] In the technical solution in the embodiment of the present application, when the steam trap needs to be cleaned, it is only necessary to close the first shut-off valve and the second shut-off valve, and at the same time, open the third shut-off valve and the fourth shut-off valve. At this time, the external liquid flows into the steam trap through the second pipe to clean the steam trap, and the cleaned sewage flows out through the third pipe. The whole cleaning process can be completed without removing the steam trap, and the cleaning process is simple and convenient, which effectively saves cleaning time.

[0010] In some embodiments, the steam trap cleaning system further comprises a first filter, which is disposed in the first pipe and is located upstream of the first shut-off valve along the liquid flow direction in the first pipe. In this way, when the steam trap cleaning system is in use, the liquid flowing into the steam trap can be filtered in advance to prevent impurities in the liquid from flowing into the steam trap.

[0011] In some embodiments, the steam trap cleaning system further comprises a fifth shutoff valve, which is disposed in the first pipeline and is located upstream of the first filter along the liquid flow direction in the first pipeline. In this way, since the first filter is located between the fifth shutoff valve and the first shutoff valve, when the first filter needs to be cleaned or replaced, the first filter can be removed after closing the fifth shutoff valve and the first shutoff valve, thereby preventing the liquid in the first pipeline from flowing out from the connection between the first filter and the first pipeline.

[0012] In some embodiments, the steam trap cleaning system further comprises a pressurizing component, which is disposed in the second pipe. Thus, when liquid needs to be input into the second pipe, the pressurizing component is turned on to increase the pressure of the liquid flowing into the second pipe, thereby increasing the pressure of the liquid flowing into the steam trap, which is beneficial to the cleaning of the steam trap.

[0013] In some embodiments, the steam trap cleaning system further comprises a treatment box, which is connected to an end of the third pipe away from the first pipe. The arrangement of the treatment box facilitates the collection of sewage after cleaning.

[0014] In some embodiments, a liquid level sensor is provided in the processing box, a display is provided on the surface of the processing box, and the liquid level sensor is electrically connected to the display. By providing the liquid level sensor and the display, the liquid level sensor sends the water level in the processing box to the display, thereby facilitating observation of the water level in the processing box.

[0015] In some embodiments, the steam trap cleaning system also includes a fourth pipe and a bypass valve; one end of the fourth pipe is connected to the inlet end of the first pipe, and the other end of the fourth pipe is connected to the outlet end of the first pipe, and the bypass valve is arranged on the fourth pipe.

[0016] Since one end of the fourth pipeline is connected to the inlet end of the first pipeline, and the other end of the fourth pipeline is connected to the outlet end of the first pipeline, the bypass valve is arranged on the fourth pipeline. Thus, when the overall system is operating normally, the bypass valve, the third shut-off valve and the fourth shut-off valve are closed, and the liquid flows out from the outlet end of the first pipeline after passing through the first shut-off valve, the steam trap and the second shut-off valve in sequence from the inlet end of the first pipeline; when the steam trap needs to be cleaned, the first shut-off valve and the second shut-off valve are closed. At this time, in order to ensure the normal operation of the overall system, the bypass valve is opened, and the liquid flows out from the outlet end of the first pipeline after passing through the fourth pipeline from the inlet end of the first pipeline.

[0017] In some embodiments, the steam trap cleaning system further comprises a second filter, which is disposed in the fourth pipe and is located upstream of the bypass valve along the liquid flow direction in the fourth pipe. In this way, the liquid flowing into the bypass valve can be filtered in advance.

[0018] In some embodiments, the surfaces of the first pipe and the fourth pipe are both provided with a protective layer, which can prevent the first pipe and the fourth pipe from being directly hit or scratched by the outside when in use.

[0019] In a second aspect, the present application provides a steam heating device, which includes a steam trap cleaning system as described in any one of the embodiments of the present application.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a steam trap cleaning system according to some embodiments of the present application.

[0023] The reference numerals in the specific implementation manner are as follows:

[0024] 10. First pipeline; 101. Inlet end; 102. Outlet end; 11. First shut-off valve; 12. Steam trap; 13. Second shut-off valve; 14. First filter; 15. Fifth shut-off valve; 20. Second pipeline; 21. Third shut-off valve; 30. Third pipeline; 31. Fourth shut-off valve; 40. Fourth pipeline; 41. Bypass valve. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0027] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0030] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0031] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0033] Steam trap is a valve used in steam pipe network and equipment, which can automatically discharge condensate, air and other non-condensable gases and prevent water vapor leakage. It plays a very important role in the steam system. Steam trap is one of the main accessories in the steam transmission system. During the steam transmission process, a large amount of condensate is generated after the steam is transported and heat exchanged. The steam trap is used to discharge the steam condensate into the boiler return water system.

[0034] The steam trap can play a good role in draining water in the early stage of use. However, after running for a period of time, impurities generated by cavitation inside the pipeline enter the steam trap with the gas and accumulate in the valve body. When the accumulation height of the impurities is equal to or higher than the valve core, it will cause blockage of the valve body outlet, resulting in poor drainage of the steam trap, which will seriously affect production and cause safety problems.

[0035] At present, in order to solve the above-mentioned problem that impurities accumulate and block the steam trap, resulting in poor drainage, low heat exchange efficiency and increased energy consumption, the existing steam trap cleaning method mainly involves removing the steam trap from the overall equipment for cleaning. However, this method has a cumbersome cleaning process, is time-consuming and labor-intensive.

[0036] In order to solve the problem that the steps are complicated, time-consuming and labor-intensive during the cleaning process of the steam trap, an embodiment of the present application provides a steam trap cleaning system, such as Figure 1 As shown, the steam trap cleaning system includes a first pipeline 10, a first shut-off valve 11, a steam trap 12, a second shut-off valve 13, a second pipeline 20, a third shut-off valve 21, a third pipeline 30 and a fourth shut-off valve 31, wherein the first shut-off valve 11, the steam trap 12 and the second shut-off valve 13 are sequentially arranged in the first pipeline 10 along the liquid flow direction in the first pipeline 10; at the same time, the first pipeline 10 between the steam trap 12 and the second shut-off valve 13 is connected to one end of the second pipeline 20, and the third shut-off valve 21 is arranged in the second pipeline 20; the first pipeline 10 between the steam trap 12 and the first shut-off valve 11 is connected to one end of the third pipeline 30, and the fourth shut-off valve 31 is arranged in the third pipeline 30.

[0037] In this embodiment, the direction of liquid flow in the first pipe 10 can refer to Figure 1The direction of the arrow in the first pipe 10 , that is, the direction of liquid flow in the first pipe 10 is from the inlet end 101 to the outlet end 102 on the first pipe 10 .

[0038] In this embodiment, the connection structure between the first shut-off valve 11, the steam trap 12 and the second shut-off valve 13 and the first pipeline 10, the connection structure between the first pipeline 10 and the second pipeline 20, the connection structure between the third shut-off valve 21 and the second pipeline 20, the first pipeline 10 and the third pipeline 30 can be connected by a flange, and the fourth shut-off valve 31 can also be connected to the third pipeline 30 by a flange. The specific structure can be determined according to actual conditions and is not limited in the embodiments of this specification.

[0039] In this embodiment, the sizes of the first pipeline 10, the second pipeline 20 and the third pipeline 30 are not limited, and can be determined according to actual conditions. At the same time, in this embodiment, the models of the first shut-off valve 11, the steam trap 12, the second shut-off valve 13, the third shut-off valve 21 and the fourth shut-off valve 31 are not limited, and can be determined according to actual conditions.

[0040] In the technical solution of the embodiment of the present application, when the steam trap 12 needs to be cleaned, it is only necessary to close the first shut-off valve 11 and the second shut-off valve 13, and at the same time, open the third shut-off valve 21 and the fourth shut-off valve 31. At this time, the external liquid is input into the second pipe 20. Since the third shut-off valve 21 is opened, the liquid will flow into the first pipe 10 between the steam trap 12 and the second shut-off valve 13. Figure 1 As shown, since the second shut-off valve 13 is closed, at this time, the liquid in the first pipe 10 can only flow to the left into the steam trap 12, and then flow out from the left side of the steam trap 12. Since the first shut-off valve 11 is closed, at this time, the liquid flowing out from the left side of the steam trap 12 will flow into the third pipe 30 after passing through the first pipe 10 located on the left side of the steam trap 12. Since the fourth shut-off valve 31 on the third pipe 30 is opened, the liquid flowing into the third pipe 30 will be discharged to the outside.

[0041] In this embodiment, the structural principle that the external liquid flows into the second pipe 20 and flows out of the third pipe 30 is only an example. For example, the external liquid can also flow into the third pipe 30 and then flow out of the second pipe 20. The specific method can be determined based on actual conditions, and the embodiments of this specification do not limit this.

[0042] When the technical solution is used, the entire cleaning process can be completed without removing the steam trap, the cleaning process is simple and convenient, and the cleaning time is effectively saved. At the same time, it can avoid damage to the steam trap when removing the steam trap.

[0043] According to some embodiments of the present application, Figure 1As shown, the steam trap cleaning system further includes a first filter 14 , which is disposed in the first pipeline 10 , and the first filter 14 is located upstream of the first shut-off valve 11 along the liquid flow direction in the first pipeline 10 .

[0044] The connection structure between the first filter 14 and the first pipe 10 in this embodiment is prior art and will not be described in detail here.

[0045] The liquid flow direction in this embodiment can refer to Figure 1 In the direction of the arrow in the first pipe 10, the first filter 14 is located on the left side of the first shut-off valve 11. In this way, when the steam trap cleaning system is in use, the liquid flowing into the steam trap 12 can be filtered in advance to prevent impurities in the liquid from flowing into the steam trap 12.

[0046] According to some embodiments of the present application, Figure 1 As shown, the steam trap cleaning system further includes a fifth shut-off valve 15 , which is disposed in the first pipeline 10 , and the fifth shut-off valve 15 is located upstream of the first filter 14 along the liquid flow direction in the first pipeline 10 .

[0047] In this embodiment, the connection structure between the fifth shut-off valve 15 and the first pipeline 10 is prior art and will not be described in detail herein.

[0048] The liquid flow direction in this embodiment can refer to Figure 1 In the direction of the arrow in the first pipe 10, the fifth shut-off valve 15 is located on the left side of the first filter 14. Figure 1 As shown, since the first filter 14 is located between the fifth shut-off valve 15 and the first shut-off valve 11, when the first filter 14 needs to be cleaned or replaced, the first filter 14 can be removed after closing the fifth shut-off valve 15 and the first shut-off valve 11, thereby preventing the liquid in the first pipe 10 from flowing out from the connection between the first filter 14 and the first pipe 10.

[0049] According to some embodiments of the present application, the steam trap cleaning system further includes a pressurizing component (not shown in the figure), which is disposed in the second pipeline 20 .

[0050] In this embodiment, the pressurizing component may be a pressurizing pump, etc., which may be specifically determined according to actual conditions, and the embodiments of this specification do not limit this.

[0051] refer to Figure 1 As shown, the pressurizing component in this embodiment can be arranged at the inlet end of the second pipeline 20, or on the second pipeline 20 located at the upper end of the third shut-off valve 21. The specific arrangement can be determined according to actual conditions, and this specification does not limit this.

[0052] Since a pressurizing component is provided on the second pipe 20 , when liquid needs to be input into the second pipe 20 , the pressurizing component is turned on to increase the pressure of the liquid flowing into the second pipe 20 , thereby increasing the pressure of the liquid flowing into the steam trap 12 , which is beneficial to the cleaning of the steam trap 12 .

[0053] According to some embodiments of the present application, the steam trap cleaning system further includes a treatment box (not shown in the figure), which is connected to an end of the third pipe 30 away from the first pipe 10 .

[0054] The treatment box in this embodiment can be an existing sewage treatment box, etc., which can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0055] In this embodiment, reference Figure 1 As shown, the lower end of the third pipe 30 is connected to the interior of the treatment box, so that it is convenient to collect the sewage discharged from the third pipe 30.

[0056] According to some embodiments of the present application, a liquid level sensor (not indicated in the figure) is provided in the processing box, a display (not indicated in the figure) is provided on the surface of the processing box, and the liquid level sensor is electrically connected to the display.

[0057] The liquid level sensor in this embodiment is fixed on the inner wall of the treatment box, the display is fixed on the side or upper surface of the treatment box, and the liquid level sensor is electrically connected to the display. When sewage is collected in the treatment box, the corresponding water level is measured by the liquid level sensor and sent to the display, so as to facilitate the observation of the water level in the treatment box.

[0058] According to some embodiments of the present application, Figure 1 As shown, the steam trap cleaning system also includes a fourth pipeline 40 and a bypass valve 41, wherein one end of the fourth pipeline 40 is connected to the inlet end 101 of the first pipeline 10, and the other end of the fourth pipeline 40 is connected to the outlet end 102 of the first pipeline 10, and the bypass valve 41 is arranged on the fourth pipeline 40.

[0059] In this embodiment, the connection structure between the fourth pipeline 40 and the first pipeline 10 is prior art, and the connection structure between the bypass valve 41 and the fourth pipeline 40 is also prior art, which will not be described in detail here.

[0060] The present embodiment does not limit the size of the fourth pipeline 40 and the model of the bypass valve 41, which can be determined according to actual conditions.

[0061] join Figure 1As shown, since one end of the fourth pipeline 40 is connected to the inlet end 101 of the first pipeline 10, and the other end of the fourth pipeline 40 is connected to the outlet end 102 of the first pipeline 10, the bypass valve 41 is arranged on the fourth pipeline 40. In this way, when the overall system is working normally, the bypass valve 41, the third shut-off valve 21 and the fourth shut-off valve 31 are closed, and the liquid flows out from the inlet end 101 of the first pipeline 10 through the first shut-off valve 11, the steam trap 12 and the second shut-off valve 13 in sequence, and then flows out from the outlet end 102 of the first pipeline 10;

[0062] When the steam trap 12 needs to be cleaned, the first shut-off valve 11 and the second shut-off valve 13 are closed. At this time, in order to ensure the normal operation of the overall system, the bypass valve 41 is opened, and the liquid flows from the inlet end 101 of the first pipe 10 through the fourth pipe 40 and then out of the outlet end 102 of the first pipe 10.

[0063] According to some embodiments of the present application, the steam trap cleaning system further includes a second filter (not shown in the figure), which is disposed in the fourth pipe 40 and located upstream of the bypass valve 41 along the liquid flow direction in the fourth pipe 40 .

[0064] The liquid flow direction in this embodiment can refer to Figure 1 The arrow direction in the fourth pipeline 40. The second filter is arranged on the left side of the bypass valve 41, so that the liquid flowing into the bypass valve 41 can be filtered in advance.

[0065] According to some embodiments of the present application, surfaces of the first pipe 10 and the fourth pipe 40 are both provided with a protective layer (not indicated in the figure).

[0066] In this embodiment, the protective layer may be a rubber layer, etc., which may be specifically determined according to actual conditions, and the embodiments of this specification do not limit this.

[0067] Since the protective layer is disposed on the surface of the first pipe 10 and the fourth pipe 40 , it is possible to prevent the first pipe 10 and the fourth pipe 40 from being directly impacted or scratched by the outside when in use.

[0068] The present application also provides a steam heating device, which includes a steam trap cleaning system as described in any one of the embodiments of the present application.

[0069] The steam trap cleaning system in the present application can refer to the above-mentioned embodiments. Since all the technical solutions of all the above-mentioned embodiments are adopted in the steam heating equipment, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A steam trap cleaning system, characterized in that: include: A first pipeline (10), a first shutoff valve (11), a steam trap (12), a second shutoff valve (13), a second pipeline (20), a third shutoff valve (21), a third pipeline (30) and a fourth shutoff valve (31); The first shut-off valve (11), the steam trap (12) and the second shut-off valve (13) are sequentially arranged in the first pipeline (10) along the flow direction of the liquid in the first pipeline (10); The first pipeline (10) between the steam trap (12) and the second shut-off valve (13) is connected to one end of the second pipeline (20), and the third shut-off valve (21) is arranged on the second pipeline (20); The first pipeline (10) between the steam trap (12) and the first shut-off valve (11) is connected to one end of the third pipeline (30), and the fourth shut-off valve (31) is arranged on the third pipeline (30).

2. The steam trap cleaning system according to claim 1, characterized in that: The steam trap cleaning system further comprises a first filter (14), wherein the first filter (14) is arranged in the first pipeline (10), and the first filter (14) is located upstream of the first shut-off valve (11) along the liquid flow direction in the first pipeline (10).

3. The steam trap cleaning system according to claim 2, characterized in that: The steam trap cleaning system further comprises a fifth shut-off valve (15), wherein the fifth shut-off valve (15) is arranged in the first pipeline (10), and the fifth shut-off valve (15) is located upstream of the first filter (14) along the flow direction of the liquid in the first pipeline (10).

4. The steam trap cleaning system according to any one of claims 1 to 3, characterized in that: The steam trap cleaning system further comprises a pressurizing component, which is arranged in the second pipeline (20).

5. The steam trap cleaning system according to any one of claims 1 to 3, characterized in that: The steam trap cleaning system further comprises a treatment box, which is connected to an end of a third pipe (30) away from the first pipe (10).

6. The steam trap cleaning system according to claim 5, characterized in that: A liquid level sensor is arranged in the processing box, a display is arranged on the surface of the processing box, and the liquid level sensor is electrically connected to the display.

7. The steam trap cleaning system according to claim 1, characterized in that: The steam trap cleaning system further comprises a fourth pipeline (40) and a bypass valve (41); One end of the fourth pipeline (40) is in communication with the inlet end (101) of the first pipeline (10), and the other end of the fourth pipeline (40) is in communication with the outlet end (102) of the first pipeline (10), and the bypass valve (41) is arranged on the fourth pipeline (40).

8. The steam trap cleaning system according to claim 7, characterized in that: The steam trap cleaning system further comprises a second filter, which is arranged in the fourth pipe (40), and the second filter is located upstream of the bypass valve (41) along the liquid flow direction in the fourth pipe (40).

9. The steam trap cleaning system according to claim 7, characterized in that: The surfaces of the first pipe (10) and the fourth pipe (40) are both provided with a protective layer.

10. A steam heating device, characterized in that: The steam heating device comprises a steam trap cleaning system as claimed in any one of claims 1 to 9.

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