Liquid level control system of low-pressure steam expansion tank

Abstract

The utility model provides a liquid level control system for a low-pressure steam expansion tank. The liquid level control system comprises the low-pressure expansion tank; a remote liquid level meter is arranged on one side of the low-pressure expansion tank; an air inlet, connected with the low-pressure steam conveying pipeline, of the low-pressure expansion tank is higher than a liquid inlet, connected with the medium-pressure steam expansion tank condensate conveying pipeline and the medium-pressure steam condensate conveying pipeline, of the low-pressure expansion tank; a top air outlet of the low-pressure expansion tank is connected with a low-pressure steam system through a low-pressure steam output pipeline; a liquid outlet in the bottom of the low-pressure expansion tank is connected with a liquid discharge pipeline with a hand valve and a liquid level control valve; and the other end of the liquid discharge pipeline is connected with the low-low pressure expansion tank. The remote liquid level meter arranged on the low-pressure expansion tank is matched with the liquid level control valve on the liquid discharge pipeline, so that the liquid level in the low-pressure expansion tank is regulated and controlled in real time, the liquid level is regulated in time before the liquid level is about to be too high or about to be too low, and the water hammer problem of the low-pressure expansion tank is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion tank liquid level control systems, in particular to a low-pressure steam expansion tank liquid level control system. Background Technique

[0002] In the traditional low-pressure steam processing technology, low-pressure steam needs to be introduced from the outside and transported to the low-pressure expansion tank through a low-pressure steam pipeline. The top of the low-pressure expansion tank is connected to a low-pressure steam pipeline network, and the low-pressure steam inside the low-pressure expansion tank is transported to the pipeline network to be heated through the low-pressure steam pipeline network.

[0003] At present, when the existing low-pressure steam processing system works, it is necessary to control the height of the liquid level in the low-pressure expansion tank. When the liquid level in the low-pressure expansion tank is higher than the low-pressure steam inlet, the low-pressure steam enters the low-pressure expansion tank through the low-pressure steam pipeline below the medium-pressure steam condensate liquid level line, and the "water hammer phenomenon" will occur, damaging the low-pressure expansion tank; when the liquid level in the low-pressure expansion tank is lower than the medium-pressure steam condensate inlet, the medium-pressure steam condensate enters the low-pressure expansion tank through the medium-pressure pipeline above the low-pressure expansion tank condensate liquid level line, causing the medium-pressure steam condensate to spray in the low-pressure expansion tank, and the "water hammer phenomenon" will also occur, damaging the low-pressure expansion tank and reducing the service life of the low-pressure expansion tank. Content of the Utility Model

[0004] The utility model provides a low-pressure steam expansion tank liquid level control system, which solves the problem that when the existing low-pressure steam processing system works, it is necessary to control the height of the liquid level in the low-pressure expansion tank. Since the low-pressure steam enters the low-pressure expansion tank through the low-pressure steam pipeline below the medium-pressure steam condensate liquid level line, the "water hammer phenomenon" will occur, damaging the low-pressure expansion tank and reducing the service life of the low-pressure expansion tank.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A low-pressure steam expansion tank liquid level control system includes: a low-pressure expansion tank, a remote liquid level gauge and a liquid level control valve; a remote liquid level gauge is provided on one side of the low-pressure expansion tank; the low-pressure expansion tank is connected to a low-pressure steam gas source through a low-pressure steam pipeline; the low-pressure expansion tank is connected to a medium-pressure steam expansion tank condensate liquid source and a medium-pressure steam condensate liquid source respectively through a medium-pressure steam expansion tank condensate pipeline and a medium-pressure steam condensate pipeline; the top air outlet of the low-pressure expansion tank is connected to a low-pressure steam system through a low-pressure steam output pipeline; the bottom liquid outlet of the low-pressure expansion tank is connected to a drain pipeline with a manual valve and a liquid level control valve; the other end of the drain pipeline is connected to the low-pressure expansion tank.

[0007] Further, the remote liquid level gauge and the liquid level control valve are connected for signal transmission.

[0008] Further, a first manual valve, a second manual valve and a liquid level control valve are provided on the liquid discharge pipeline.

[0009] Further, the liquid level control valve receives the liquid level height signal in the low-pressure expansion tank sent by the remote liquid level gauge, and adjusts the liquid discharge flow rate of the liquid discharge pipeline at the bottom of the low-pressure expansion tank through the liquid level control valve.

[0010] Further, the air inlet of the low-pressure expansion tank connected to the low-pressure steam transmission pipeline is higher than the liquid inlet of the low-pressure expansion tank connected to the condensate transmission pipeline of the medium-pressure steam expansion tank and the medium-pressure steam condensate transmission pipeline.

[0011] Further, the remote liquid level gauge is a differential pressure remote liquid level gauge.

[0012] The beneficial effects of the present utility model are as follows:

[0013] By cooperating the remote liquid level gauge provided on the low-pressure expansion tank with the liquid level control valve on the liquid discharge pipeline, the present utility model realizes real-time regulation of the liquid level in the low-pressure expansion tank, and adjusts the liquid level in time before the liquid level is about to be too high or too low, effectively solving the water hammer problem of the low-pressure expansion tank.

[0014] In the present utility model, the condensate of the medium-pressure steam expansion tank and the medium-pressure steam condensate in the low-pressure expansion tank are stored to form a certain liquid level, the condensate entrained in the low-pressure steam is collected, and at the same time, a liquid seal is formed, and the steam at the top of the low-pressure expansion tank is output to the low-pressure steam system.

[0015] In the present utility model, the air inlet of the low-pressure steam transmission pipeline is higher than the liquid inlets of the condensate transmission pipeline of the medium-pressure steam expansion tank and the medium-pressure steam condensate transmission pipeline, so that the liquid level in the low-pressure expansion tank is higher than the liquid inlets of the condensate transmission pipeline of the medium-pressure steam expansion tank and the medium-pressure steam condensate transmission pipeline, forming a liquid seal to avoid liquid hammer phenomenon when the condensate of the medium-pressure steam expansion tank and the medium-pressure steam condensate enter the low-pressure expansion tank and contact with the low-pressure steam. Description of the Drawings

[0016] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the whole of the present utility model.

[0018] Explanation of the Reference Numerals in the Drawings:

[0019] 1. Low-pressure expansion tank; 2. Remote liquid level gauge; 3. Liquid level control valve; 4. Low-pressure steam system; 401. Low-pressure steam output pipeline; 5. Low-pressure steam gas source; 501. Low-pressure steam transmission pipeline; 6. Condensate liquid source of medium-pressure steam expansion tank; 601. Condensate liquid transmission pipeline of medium-pressure steam expansion tank; 7. Condensate liquid source of medium-pressure steam; 701. Condensate liquid transmission pipeline of medium-pressure steam; 8. First manual valve; 9. Second manual valve; 10. Drainage pipeline; 11. Ultra-low-pressure expansion tank. Detailed implementation manners

[0020] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0023] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model: The orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0025] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationships of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0026] In addition, it should be noted that the use of words such as "first", "second" to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, these words have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0027] The present utility model provides a technical solution: a liquid level control system for a low-pressure steam expansion tank, as Figure 1 shown, which includes: a low-pressure expansion tank 1, a remote liquid level gauge 2, and a liquid level control valve 3; a remote liquid level gauge 2 is provided on one side of the low-pressure expansion tank 1; the low-pressure expansion tank 1 is connected to a low-pressure steam gas source 5 through a low-pressure steam transmission pipeline 501; the low-pressure expansion tank 1 is connected to a medium-pressure steam expansion tank condensate liquid source 6 and a medium-pressure steam condensate liquid source 7 through a medium-pressure steam expansion tank condensate transmission pipeline 601 and a medium-pressure steam condensate transmission pipeline 701 respectively; the top air outlet of the low-pressure expansion tank 1 is connected to a low-pressure steam system 4 through a low-pressure steam output pipeline 401; the bottom liquid outlet of the low-pressure expansion tank 1 is connected to a drain pipeline 10 with a manual valve and a liquid level control valve 3; the other end of the drain pipeline 10 is connected to a low-low pressure expansion tank 11.

[0028] The remote liquid level gauge 2 and the liquid level control valve 3 are connected for signal transmission; after receiving the liquid level signal of the low-pressure expansion tank 1 sent by the remote liquid level gauge 2, the liquid level control valve 3 adjusts the liquid discharge flow rate of the bottom drain pipeline 10 of the low-pressure expansion tank 1.

[0029] A first manual valve 8, a second manual valve 9, and a liquid level control valve 3 are provided on the drain pipeline 10.

[0030] The air inlet of the low-pressure expansion tank 1 connected to the low-pressure steam transmission pipeline 501 is higher than the liquid inlets of the low-pressure expansion tank 1 connected to the medium-pressure steam expansion tank condensate transmission pipeline 601 and the medium-pressure steam condensate transmission pipeline 701.

[0031] The remote liquid level gauge 2 is a differential pressure type remote liquid level gauge.

[0032] The liquid level control valve 3 is arranged downstream of the first manual valve 8.

[0033] The implementation method of the present utility model is as follows:

[0034] The low-pressure steam gas source 5 is transported to the low-pressure expansion tank through the low-pressure steam transmission pipeline 501, and at the same time, the medium-pressure steam expansion tank condensate liquid source 6 and the medium-pressure steam condensate liquid source 7 are transported into the low-pressure expansion tank 1 through the medium-pressure steam expansion tank condensate transmission pipeline 601 and the medium-pressure steam condensate transmission pipeline 701;

[0035] The liquid level height in the low-pressure expansion tank 1 is detected by the remote liquid level gauge 2 on the low-pressure expansion tank 1. When the liquid level is too high or too low, the remote liquid level gauge 2 sends a liquid level signal to the liquid level control valve 3, and the liquid level control valve 3 adjusts the liquid resistance to control the flow rate of the medium-pressure steam condensate in the drain pipeline 10, so that the liquid level in the low-pressure expansion tank 1 is adjusted to an appropriate height;

[0036] The liquid droplets generated by the temperature difference in the low-pressure steam expansion tank 1 are fused with the condensate in the medium-pressure steam expansion tank and the medium-pressure steam condensate, and are transported to the ultra-low-pressure expansion tank 11 through the drain pipeline 10;

[0037] The low-pressure steam at the top in the low-pressure steam expansion tank 1 is output to the low-pressure steam system 4 through the low-pressure steam output pipeline 401;

[0038] When it is necessary to repair the liquid level control valve 3, close the first manual valve 8 and the second manual valve 9 on the drain pipeline to ensure the safety of the repair work.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A low-pressure steam expansion tank liquid level control system, characterized in that: include: A low-pressure expansion tank (1), a remote liquid level gauge (2) and a liquid level control valve (3); a remote liquid level gauge (2) is provided on one side of the low-pressure expansion tank (1); the low-pressure expansion tank (1) is connected to a low-pressure steam gas source (5) through a low-pressure steam delivery pipeline (501); the low-pressure expansion tank (1) is connected to a medium-pressure steam expansion tank condensate liquid source (6) and a medium-pressure steam condensate liquid source (7) through a medium-pressure steam expansion tank condensate delivery pipeline (601) and a medium-pressure steam condensate delivery pipeline (701) respectively; the top gas outlet of the low-pressure expansion tank (1) is connected to a low-pressure steam system (4) through a low-pressure steam output pipeline (401); the bottom liquid outlet of the low-pressure expansion tank (1) is connected to a discharge pipeline (10) with a hand valve and a liquid level control valve (3); the other end of the discharge pipeline (10) is connected to a low-pressure expansion tank (11).

2. A low-pressure steam expansion tank liquid level control system according to claim 1, characterized in that: The remote liquid level meter (2) and the liquid level control valve (3) are connected for signal transmission.

3. A low-pressure steam expansion tank liquid level control system according to claim 1, characterized in that: The liquid discharge pipeline (10) is provided with a first hand valve (8), a second hand valve (9) and a liquid level control valve (3).

4. A low-pressure steam expansion tank liquid level control system according to claim 1, characterized in that: After receiving the liquid level signal of the low-pressure expansion tank (1) sent by the remote liquid level meter (2), the liquid level control valve (3) adjusts the liquid outflow rate of the liquid discharge pipeline (10) at the bottom of the low-pressure expansion tank (1) through the liquid level control valve (3).

5. A low-pressure steam expansion tank liquid level control system according to claim 1, characterized in that: The air inlet connecting the low-pressure expansion tank (1) and the low-pressure steam delivery pipeline (501) is higher than the liquid inlet connecting the low-pressure expansion tank (1) and the medium-pressure steam expansion tank condensate delivery pipeline (601) and the medium-pressure steam condensate delivery pipeline (701).

6. A low-pressure steam expansion tank liquid level control system according to claim 1, characterized in that: The remote liquid level gauge (2) is a differential pressure type remote liquid level gauge.

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