Heater corrosion inhibition system

Abstract

The utility model belongs to the technical field of heaters, and particularly relates to a heater corrosion inhibition system which is characterized in that a heater is connected with a steam pipe network for heat exchange, the steam pipe network is connected to a heater inlet through a steam inlet pipeline, a heater outlet is connected with the steam pipe network through a steam outlet pipeline, and the steam inlet pipeline is connected with a steam inlet valve group. The front path and the rear path of the steam inlet valve group are connected through a subline, the subline is connected with the steam outlet pipeline through a return pipeline, and a return valve is arranged on the return pipeline; the pipe section between the front path of the steam inlet valve group and the backflow pipeline connector is a first subline pipe section, the pipe section between the backflow pipeline connector and the rear path of the steam inlet valve group is a second subline pipe section, and an overline valve is arranged on the second subline pipe section. The auxiliary line and the backflow pipeline are added to the heating pipe to form a circulation loop with the steam pipeline of the heater, so that the heater is always in a hot standby state, heater seal head leakage caused by alternate cooling and heating is avoided, the regeneration shutdown frequency is reduced, and the aromatic hydrocarbon yield is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heaters, and in particular relates to a corrosion inhibition system for heaters. Background Art

[0002] The heater of the drying system of the reforming regeneration unit is heated intermittently, and the large temperature difference between alternating hot and cold causes leakage, corrosion and cracking of the head. After leakage occurs, the regeneration unit needs to be shut down for maintenance. During the shutdown and maintenance process, the reforming catalyst stops circulating, causing the carbon content to increase, affecting the yield of aromatics. Summary of the invention

[0003] In view of the defects of the above-mentioned prior art, the purpose of the utility model is to provide a heater corrosion inhibition system to avoid heater cooling and thermal alternation, extend the service life of the heater, and ensure the long-term stable operation of the drying system of the reforming and regeneration unit.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a heater corrosion inhibition system, the heater is connected to a steam network for heat exchange, the steam network is connected to the heater inlet through a steam inlet pipeline, the heater outlet is connected to the steam network through a steam outlet pipeline, the steam inlet pipeline is connected to a steam inlet valve group, the front and rear paths of the steam inlet valve group are connected through a secondary line, the secondary line is connected to the steam outlet pipeline through a reflux pipeline, and a reflux valve is arranged on the reflux pipeline; the pipe section between the front path of the steam inlet valve group and the reflux pipeline interface is the first pipe section of the secondary line, and the pipe section between the reflux pipeline interface and the rear path of the steam inlet valve group is the second pipe section of the secondary line, and a cross-line valve is arranged on the second pipe section of the secondary line.

[0005] Furthermore, a flow limiting orifice is provided in front of the cross-line valve.

[0006] Furthermore, a circulation loop is formed between the steam outlet pipeline, the reflux pipeline, the second pipe section of the secondary line and the steam pipeline of the heater.

[0007] Furthermore, a double valve group is provided on the first pipe section of the secondary line.

[0008] Furthermore, a shower valve is provided at the inlet of the reflux pipeline.

[0009] Furthermore, the main line of the steam outlet pipeline is connected to the steam network, the branch of the steam outlet pipeline is connected to the return pipeline, a return front valve and a return back valve are arranged on the branch of the steam outlet pipeline, and the return pipeline is connected between the return front valve and the return back valve.

[0010] Furthermore, a return water valve for controlling on-off is arranged on the main line of the steam outlet pipeline.

[0011] Furthermore, the steam pipeline network is a 3.5Mpa steam pipeline network.

[0012] Furthermore, the secondary line is a DN20, PN5.0 pipeline.

[0013] The beneficial effects of the utility model are as follows: the heater corrosion inhibition system of the utility model forms a circulation loop with the steam pipe of the heater by adding a secondary line and a reflux line to the heating pipe, so that the heater is always in a hot standby state, avoiding leakage of the heater head caused by alternating hot and cold, reducing the number of regeneration shutdowns, and improving the yield of aromatics. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the process flow chart of the heater corrosion inhibition system;

[0015] In the figure: 1. heater, 2. steam inlet pipeline, 3. steam inlet valve group, 4. steam outlet pipeline, 4.1 steam outlet pipeline main line, 4.2 steam outlet pipeline branch, 5. reflux pipeline, 6. reflux valve, 7. first pipe section of auxiliary line, 8. double valve group, 9. second pipe section of auxiliary line, 10. cross-line valve, 11. flow limiting orifice plate, 12. shower valve, 13. reflux front valve, 14. reflux rear valve, 15. return water valve group. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0017] See attached Figure 1, a heater corrosion inhibition system, the heater 1 is connected to a 3.5Mpa steam network for heat exchange, the 3.5Mpa steam network is connected to the inlet of the heater 1 through a steam inlet pipeline 2, the outlet of the heater 1 is connected to the 3.5Mpa steam network through a steam outlet pipeline 4, the steam inlet pipeline 2 is connected to a steam inlet valve group 3, the front and rear routes of the steam inlet valve group 3 are connected through a secondary line, the secondary line is connected to the steam outlet pipeline 4 through a reflux pipeline 5, and a reflux valve 6 is arranged on the reflux pipeline 5; the pipe section from the front route of the steam inlet valve group 3 to the outlet of the reflux pipeline 5 is a first pipe section 7 of the secondary line, and a double valve group 8 is arranged on the first pipe section 7 of the secondary line, and the pipe section from the outlet of the reflux pipeline 5 to the rear route of the steam inlet valve group 3 is a second pipe section 9 of the secondary line, a cross-line valve 10 is arranged on the second pipe section 9 of the secondary line, and a flow limiting orifice 11 is arranged in front of the cross-line valve 10. A circulation loop is formed between the steam outlet pipeline 4 , the reflux pipeline 5 , the secondary line second pipe section 9 and the steam pipeline of the heater 1 .

[0018] Furthermore, a shower valve 12 is provided at the inlet of the reflux pipeline 5 .

[0019] Furthermore, the main line 4.1 of the steam outlet pipeline is connected to the 3.5Mpa steam network, the branch line 4.2 of the steam outlet pipeline is connected to the return pipeline 5, and a return front valve 13 and a return back valve 14 are arranged on the branch line 4.2 of the steam outlet pipeline, and the return pipeline 5 is connected between the return front valve 13 and the return back valve 14.

[0020] Furthermore, a return water valve group 15 for controlling on-off is provided on the main line 4.1 of the steam outlet pipeline.

[0021] Furthermore, the secondary line is a DN20, PN5.0 pipeline.

[0022] Based on the above technical solution, when the heater 1 is in normal use, the steam inlet valve group 3 and the return valve group 15 are opened, the double valve group 8 and the reflux front valve 13 are closed, and the steam flows from the steam inlet pipeline 2 to the main steam outlet pipeline 4.1 to provide a heat source for the material for heat exchange; when the heater 1 is not in use, the double valve group 8, the reflux back valve 14 and the return valve group 15 are closed, and the steam inlet valve group 3, the reflux front valve 13, the reflux valve 6 and the cross-line valve 10 are first opened, and a small amount of steam enters the heater 1 from the steam inlet pipeline 2 through the steam inlet valve group 3. After the small amount of steam in the heater 1 enters the reflux pipeline 5 through the branch 4.2 of the steam outlet pipeline and the reflux front valve 13, it enters the second pipe section 9 of the secondary line through the reflux valve 6 and the cross-line valve 10, and then enters the heater 1 for circulation, so that the heater 1 is always in a hot standby state, avoiding the leakage of the heater head caused by alternating hot and cold, and reducing the number of regeneration shutdowns. The flow-limiting orifice plate 11 limits the steam flow rate, so that the hot steam flows slowly and evenly in the circulation pipeline.

[0023] The system transformation process of the utility model is as follows:

[0024] 1. Lead a pipeline (DN20, PN5.0) from the manual valve before the steam inlet of heater 1 to the short section after the valve, add a hand valve (DN20, PN5.0) on the pipeline, add a hand valve flange connection, and add a flow limiting orifice (DN20, PN5.0) in front of the valve. Add a hand valve (DN20, PN5.0) to the original pipeline after the double valve of the manual valve before the steam inlet of the heater.

[0025] The present invention does not disclose some common knowledge in the art.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] The above examples are only the best embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the contents disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A heater corrosion inhibition system, characterized in that: The heater is connected to a steam network for heat exchange, the steam network is connected to the heater inlet through a steam inlet pipeline, the heater outlet is connected to the steam network through a steam outlet pipeline, the steam inlet pipeline is connected to a steam inlet valve group, the front and rear paths of the steam inlet valve group are connected through a secondary line, the secondary line is connected to the steam outlet pipeline through a reflux pipeline, and a reflux valve is arranged on the reflux pipeline; the pipe section between the front path of the steam inlet valve group and the reflux pipeline interface is the first pipe section of the secondary line, the pipe section between the reflux pipeline interface and the rear path of the steam inlet valve group is the second pipe section of the secondary line, and a cross-line valve is arranged on the second pipe section of the secondary line.

2. A heater corrosion inhibition system according to claim 1, characterized in that: A flow limiting orifice is arranged in front of the cross-line valve.

3. A heater corrosion inhibition system according to claim 1, characterized in that: A circulation loop is formed between the steam outlet pipeline, the reflux pipeline, the second pipe section of the secondary line and the steam pipeline of the heater.

4. A heater corrosion inhibition system according to claim 1, characterized in that: A double valve group is arranged on the first pipe section of the secondary line.

5. The heater corrosion inhibition system according to claim 1, characterized in that: A shower valve is arranged at the inlet of the return pipeline.

6. A heater corrosion inhibition system according to claim 1, characterized in that: The main line of the steam outlet pipeline is connected to the steam network, and the branch of the steam outlet pipeline is connected to the return pipeline. A return front valve and a return back valve are arranged on the branch of the steam outlet pipeline, and the return pipeline is connected between the return front valve and the return back valve.

7. A heater corrosion inhibition system according to claim 6, characterized in that: A return water valve for controlling on and off is arranged on the main line of the steam outlet pipeline.

8. The heater corrosion inhibition system according to claim 1, characterized in that: The steam pipe network is a 3.5Mpa steam pipe network.

9. The heater corrosion inhibition system according to claim 1, characterized in that: The secondary line is a DN20, PN5.0 pipeline.

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