Industrial steam supply system with temperature mixing device

Abstract

The utility model relates to an industrial steam supply system with a temperature mixing device, the industrial steam supply system with the temperature mixing device comprises a boiler, a high-pressure cylinder and an intermediate-pressure cylinder, the boiler generates reheated hot section steam and superheated steam, a first pipeline is connected between a reheated hot section steam outlet of the boiler and an inlet of an upper inner cylinder of the intermediate-pressure cylinder, and a second pipeline is connected between the high-pressure cylinder and the intermediate-pressure cylinder. A second pipeline is connected between a superheated steam outlet of the boiler and an inlet of the high-pressure cylinder, reheating cold section steam generated by the high-pressure cylinder is conveyed into the boiler through a third pipeline, the first end of the fourth pipeline is communicated with the third pipeline, and the second end of the fourth pipeline is communicated with the second pipeline. The second end of the fourth pipeline is communicated with an interlayer between an upper inner cylinder and an upper outer cylinder of the medium-pressure cylinder so that reheating cold section steam in the third pipeline can be sucked into the interlayer, the cold steam can be mixed with reheating hot section steam overflowing from an inlet of the upper inner cylinder, the temperature around the inlet of the upper inner cylinder is reduced, and therefore the temperature difference of the upper cylinder and the lower cylinder is prevented from exceeding the limit.

Description

Technical Field

[0001] The present disclosure relates to the technical field of temperature mixing devices, and in particular to an industrial steam supply system with a temperature mixing device. Background Art

[0002] The industrial steam supply system includes a boiler and an intermediate-pressure cylinder of a steam turbine. The intermediate-pressure cylinder of a steam turbine includes an inner cylinder and an outer cylinder. Both the inner cylinder and the outer cylinder are composed of an upper and lower cylinder. The reheated hot section steam generated by the boiler is transported to the inner cylinder of the intermediate-pressure cylinder of the steam turbine through a pipeline. In the related technology, the outer periphery of the pipeline and the upper inner cylinder of the intermediate-pressure cylinder of the steam turbine are not tightly sealed. The reheated hot section steam in the inner cylinder can easily overflow through the gap, thereby causing the temperature difference between the upper and lower cylinders to exceed the limit. Utility Model Content

[0003] An object of the present disclosure is to provide an industrial steam supply system with a temperature mixing device to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above-mentioned objectives, the present disclosure provides an industrial steam supply system with a temperature mixing device, comprising a boiler, a high-pressure cylinder and an intermediate-pressure cylinder, wherein the boiler generates reheated hot section steam and superheated steam, a first pipeline is connected between the reheated hot section steam outlet of the boiler and the inlet of the upper inner cylinder of the intermediate-pressure cylinder, a second pipeline is connected between the superheated steam outlet of the boiler and the inlet of the high-pressure cylinder, the reheated cold section steam generated by the high-pressure cylinder is transported to the boiler through a third pipeline, and the industrial steam supply system with a temperature mixing device also includes a fourth pipeline, a first end of the fourth pipeline is connected to the third pipeline, and a second end of the fourth pipeline is connected to the interlayer between the upper inner cylinder and the upper outer cylinder of the intermediate-pressure cylinder.

[0005] Optionally, the second end of the fourth pipeline extends into the interlayer and is close to the inlet of the upper inner cylinder.

[0006] Optionally, the upper outer cylinder is provided with a through hole, the through hole is opened in the upper outer cylinder near the first pipeline, and the through hole is connected to the interlayer, and the second end of the fourth pipeline is installed at the through hole.

[0007] Optionally, the industrial steam supply system with a temperature mixing device further comprises a first sealing member, wherein the first sealing member is arranged between the outer periphery of the fourth pipeline and the inner wall of the through hole.

[0008] Optionally, a valve assembly is installed on the fourth pipeline, and the valve assembly is used to control the flow rate of the reheat cold section steam entering the intermediate pressure cylinder.

[0009] Optionally, the valve assembly includes an electric isolation valve, an electric regulating valve and a manual isolation valve.

[0010] Optionally, the industrial steam supply system with a temperature mixing device further comprises a second seal, which is arranged between the outer periphery of the first pipeline and the inner wall of the inlet of the upper inner cylinder.

[0011] Optionally, a reheater and a superheater are provided in the boiler, the reheater is used to generate the reheating hot section steam, the outlet of the reheater is connected to the first pipeline, the inlet of the reheater is connected to the third pipeline, the superheater is used to generate the superheated steam, and the outlet of the superheater is connected to the second pipeline.

[0012] Optionally, the first pipeline, the second pipeline and the third pipeline are all installed with control valves.

[0013] Optionally, the medium-pressure cylinder further includes a lower inner cylinder and a lower outer cylinder arranged outside the lower inner cylinder, the upper inner cylinder and the lower inner cylinder form an inner cylinder, and the upper outer cylinder and the lower outer cylinder form an outer cylinder.

[0014] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0015] The reheated cold section steam discharged from the high-pressure cylinder is transported back to the boiler through the third pipeline, the first end of the fourth pipeline is connected to the third pipeline, and the second end of the fourth pipeline is connected to the interlayer between the upper inner cylinder and the upper outer cylinder, so as to draw the reheated cold section steam in the third pipeline into the interlayer. This part of cold steam can be mixed with the hot reheated section steam overflowing through the inlet of the upper inner cylinder, thereby reducing the temperature around the inlet of the upper inner cylinder, thereby avoiding the temperature difference between the upper and lower cylinders from exceeding the limit.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a schematic diagram of an industrial steam supply system with a temperature mixing device according to an exemplary embodiment of the present disclosure.

[0019] Figure 2 It is a half-section view of an intermediate pressure cylinder of an industrial steam supply system with a temperature mixing device according to an exemplary embodiment of the present disclosure.

[0020] Description of Reference Numerals

[0021] 100. Boiler; 110. Reheater; 120. Superheater; 200. High-pressure cylinder; 300. Medium-pressure cylinder; 311. Upper inner cylinder; 321. Upper outer cylinder; 3211. Interlayer; 3212. Through hole; 322. Lower outer cylinder; 410. First pipeline; 420. Second pipeline; 430. Third pipeline; 440. Fourth pipeline; 510. Valve assembly; 511. Electric isolating valve; 512. Electric regulating valve; 513. Manual isolating valve; 520. Control valve. DETAILED DESCRIPTION

[0022] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0023] In the present disclosure, unless otherwise stated, the directional words used, such as "upper, lower, vertical", are defined according to the use direction of the industrial steam supply system with a temperature mixing device, and "inside, outside" are defined according to the contours of the corresponding parts. The terms used in the present disclosure, such as "first, second", etc., are used to distinguish one element from another element and do not have order and importance. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0024] See also Figure 1 and Figure 2 , an industrial steam supply system with a temperature mixing device provided by an embodiment of the present disclosure includes a boiler 100, a high-pressure cylinder 200 and an intermediate-pressure cylinder 300. The boiler 100 can generate reheated hot section steam and superheated steam, a first pipeline 410 can be connected between the reheated hot section steam outlet of the boiler 100 and the inlet of the upper inner cylinder 311 of the intermediate-pressure cylinder 300, a second pipeline 420 can be connected between the superheated steam outlet of the boiler 100 and the inlet of the high-pressure cylinder 200, and the reheated cold section steam generated by the high-pressure cylinder 200 can be transported to the boiler 100 through a third pipeline 430. The function of the high-pressure cylinder 200 is to reduce the pressure and temperature of the superheated steam to the level required by the intermediate-pressure cylinder 300. The intermediate-pressure cylinder 300 receives the steam discharged from the high-pressure cylinder 200 and the reheated hot section steam, and reduces them to the level required by the low-pressure cylinder.

[0025] In this embodiment, the industrial steam supply system with a temperature mixing device may also include a fourth pipeline 440, a first end of the fourth pipeline 440 may be connected to the third pipeline 430, and a second end of the fourth pipeline 440 may be connected to the interlayer 3211 between the upper inner cylinder 311 and the upper outer cylinder 321 of the intermediate pressure cylinder 300. In this embodiment, the intermediate pressure cylinder 300 is a double-layer cylinder, and steam is introduced into the interlayer 3211 to reduce the pressure difference and temperature of each layer of the cylinder, so that the pressure of the reheated hot section steam in the intermediate pressure cylinder 300 can be shared by the inner and outer layers of the cylinder, thereby reducing the wall thickness of the inner and outer cylinders, which is beneficial to the safe startup and operation of the intermediate pressure cylinder 300.

[0026] The processing method in the related technology is: first shut down the industrial steam supply system, and then replace the sealing ring between the outer periphery of the first pipeline 410 and the inner wall of the inlet of the upper inner cylinder 311 of the medium pressure cylinder 300. Although this method can solve the problem of steam overflow at the inlet of the upper inner cylinder 311 of the medium pressure cylinder 300, there will be a problem of long shutdown and maintenance period of the industrial steam supply system, which affects the economy of the industrial steam supply system and the economic benefits of the power plant. In this embodiment, the fourth pipeline 440 is connected between the third pipeline 430 and the interlayer 3211 to draw the reheated cold section steam in the third pipeline 430 into the interlayer 3211. This part of the cold steam can be mixed with the reheated hot section steam (hot steam) overflowing through the inlet of the upper inner cylinder 311, thereby reducing the temperature around the inlet of the upper inner cylinder 311, avoiding deformation of the cylinder due to excessive temperature difference between the upper and lower cylinders, and further avoiding friction between the moving and static parts of the intermediate pressure cylinder 300, thereby avoiding vibration of the intermediate pressure cylinder 300 and bending accidents of the main shaft, and ensuring the stable operation of the industrial steam supply system. This embodiment does not require the steam supply system to be shut down, reducing the economic losses caused by the shutdown.

[0027] In this example, see Figure 1 and Figure 2 The following two implementations can be used to achieve the communication between the second end of the fourth pipeline 440 and the interlayer 3211.

[0028] In one embodiment, the second end of the fourth pipeline 440 can extend into the interlayer 3211 and can be close to the inlet of the upper inner cylinder 311, so that the reheated cold section steam (cold steam) discharged through the second end of the fourth pipeline 440 can be directly mixed with the reheated hot section steam (hot steam) overflowing from the inlet of the upper inner cylinder 311, thereby improving the mixing effect of cold steam and hot steam.

[0029] In another embodiment, the upper outer cylinder 321 may be provided with a through hole 3212, the through hole 3212 may be opened at the upper outer cylinder 321 near the first pipeline 410, and the through hole 3212 may be connected to the interlayer 3211, and the second end of the fourth pipeline 440 may be installed at the through hole 3212. It can be understood that the reheated cold section steam (cold steam) in the fourth pipeline 440 is discharged into the interlayer 3211, and the cold steam flows in the interlayer 3211 to the vicinity of the inlet of the upper inner cylinder 311 to achieve mixing of the cold steam and the hot steam. In this embodiment, it is not necessary to extend the second end of the fourth pipeline 440 to the vicinity of the inlet of the upper inner cylinder 311, thereby reducing the length of the fourth pipeline 440.

[0030] Furthermore, the industrial steam supply system with a temperature mixing device may also include a first seal, which may be a sealing ring. The first seal may be arranged between the outer periphery of the fourth pipeline 440 and the inner wall of the through hole 3212 to prevent the reheated cold section steam (cold steam) from overflowing through the through hole 3212.

[0031] In one embodiment, see Figure 1 A valve assembly 510 can be installed on the fourth pipeline 440. The valve assembly 510 can be used to control the flow rate of the reheated cold section steam entering the intermediate pressure cylinder 300. The user can control the amount of reheated cold section steam (cold steam) entering the intermediate pressure cylinder 300 according to the amount of reheated hot section steam (hot steam) overflowing from the inlet of the upper inner cylinder 311, thereby improving the mixing effect of cold steam and hot steam. This method of controlling the steam flow rate is simple and convenient.

[0032] Furthermore, the valve assembly 510 may include an electric isolation valve 511, an electric regulating valve 512 and a manual isolation valve 513. By providing the manual isolation valve 513, when the electric valve fails, the user can still control the flow of cold steam entering the medium pressure cylinder 300 through the manual valve.

[0033] In one embodiment, see Figure 2 The industrial steam supply system with a temperature mixing device may further include a second seal, which may be a sealing ring. The second seal may be arranged between the outer periphery of the first pipeline 410 and the inner wall of the inlet of the upper inner cylinder 311, thereby reducing the amount of reheated hot section steam (hot steam) overflowing from the inlet of the upper inner cylinder 311, thereby reducing the demand for reheated cold section steam (cold steam) of the intermediate pressure cylinder 300 and saving the consumption of cold steam.

[0034] In one embodiment, see Figure 1The boiler 100 may be provided with a reheater 110 and a superheater 120. The reheater 110 may be used to generate reheated hot section steam, and the outlet of the reheater 110 may be connected to the first pipeline 410 to supply the reheated hot section steam to the intermediate pressure cylinder 300. The inlet of the reheater 110 may be connected to the third pipeline 430, so that the reheater 110 can recover the reheated cold section steam discharged from the high pressure cylinder 200, which is beneficial to the recycling of cold steam. The superheater 120 may be used to generate superheated steam, and the outlet of the superheater 120 may be connected to the second pipeline 420 to supply the superheated steam to the high pressure cylinder 200.

[0035] In one embodiment, see Figure 1 The first pipeline 410, the second pipeline 420 and the third pipeline 430 can be installed with a control valve 520. By setting the control valve 520, the amount of steam in the first pipeline 410, the second pipeline 420 and the third pipeline 430 can be adjusted, which is convenient for controlling the smooth operation of the industrial steam supply system.

[0036] In one embodiment, see Figure 2 The intermediate pressure cylinder 300 may further include a lower inner cylinder and a lower outer cylinder 322 disposed outside the lower inner cylinder, the upper inner cylinder 311 and the lower inner cylinder may enclose an inner cylinder, the upper outer cylinder 321 and the lower outer cylinder 322 may enclose an outer cylinder, and the interlayer 3211 may be located between the inner cylinder and the outer cylinder. By providing the inner cylinder and the outer cylinder, the pressure of the reheated hot section steam in the intermediate pressure cylinder 300 may be shared by the inner and outer cylinders, thereby reducing the wall thickness of the inner and outer cylinders, which is beneficial to the safe operation of the intermediate pressure cylinder 300 and facilitates the startup of the intermediate pressure cylinder 300.

[0037] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0038] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0039] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An industrial steam supply system with a temperature mixing device, comprising a boiler, a high-pressure cylinder and a medium-pressure cylinder, wherein: The boiler generates reheat hot section steam and superheated steam, a first pipeline is connected between the reheat hot section steam outlet of the boiler and the inlet of the upper inner cylinder of the intermediate pressure cylinder, a second pipeline is connected between the superheated steam outlet of the boiler and the inlet of the high pressure cylinder, the reheat cold section steam generated by the high pressure cylinder is transported to the boiler through a third pipeline, and it is characterized in that the industrial steam supply system with a temperature mixing device also includes a fourth pipeline, a first end of the fourth pipeline is connected to the third pipeline, and a second end of the fourth pipeline is connected to the interlayer between the upper inner cylinder and the upper outer cylinder of the intermediate pressure cylinder.

2. The industrial steam supply system with a temperature mixing device according to claim 1, characterized in that: The second end of the fourth pipeline extends into the interlayer and is close to the inlet of the upper inner cylinder.

3. The industrial steam supply system with a temperature mixing device according to claim 1, characterized in that: The upper outer cylinder is provided with a through hole, the through hole is opened in the upper outer cylinder near the first pipeline, and the through hole is communicated with the interlayer, and the second end of the fourth pipeline is installed at the through hole.

4. The industrial steam supply system with a temperature mixing device according to claim 3, characterized in that: The industrial steam supply system with a temperature mixing device further includes a first sealing member, which is disposed between the outer periphery of the fourth pipeline and the inner wall of the through hole.

5. The industrial steam supply system with a temperature mixing device according to claim 1, characterized in that: The fourth pipeline is provided with a valve assembly, and the valve assembly is used to control the flow rate of the reheated cold section steam entering the intermediate pressure cylinder.

6. The industrial steam supply system with a temperature mixing device according to claim 5, characterized in that: The valve assembly comprises an electric isolation valve, an electric regulating valve and a manual isolation valve.

7. The industrial steam supply system with a temperature mixing device according to claim 1, characterized in that: The industrial steam supply system with a temperature mixing device further includes a second seal, which is arranged between the outer periphery of the first pipeline and the inner wall of the inlet of the upper inner cylinder.

8. The industrial steam supply system with a temperature mixing device according to claim 1, characterized in that: A reheater and a superheater are provided in the boiler. The reheater is used to generate the reheating hot section steam. The outlet of the reheater is connected to the first pipeline, and the inlet of the reheater is connected to the third pipeline. The superheater is used to generate the superheated steam, and the outlet of the superheater is connected to the second pipeline.

9. The industrial steam supply system with a temperature mixing device according to claim 1, characterized in that: The first pipeline, the second pipeline and the third pipeline are all equipped with control valves.

10. The industrial steam supply system with a temperature mixing device according to claim 1, characterized in that: The medium-pressure cylinder further includes a lower inner cylinder and a lower outer cylinder arranged outside the lower inner cylinder, the upper inner cylinder and the lower inner cylinder enclose an inner cylinder, and the upper outer cylinder and the lower outer cylinder enclose an outer cylinder.

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