Condensate recovery system of back pressure steam turbine

Abstract

The utility model relates to the technical field of back pressure type steam turbines in the petrochemical industry, in particular to a condensate water recovery system of a back pressure type steam turbine. The steam evacuator is connected with the back pressure type steam turbine; the circulating water cooler is connected with the steam evacuator; a steam condensation water pipeline is connected with the circulating water cooler; the water storage tank is connected with the steam condensation water pipeline; the immersed pump is arranged in the water storage tank, and the immersed pump is connected with a motor; a recovery pipeline is connected with the immersed pump, and a one-way valve and a stop valve are arranged on the recovery pipeline; the circulating water return pipeline is connected with the recycling pipeline; according to the utility model, the condensed water is collected into the water storage tank, and then the condensed water is conveyed into a circulating water system, so that the purpose of energy conservation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of back-pressure steam turbines in the petrochemical industry, in particular to a condensate recovery system for a back-pressure steam turbine. Background Art

[0002] At present, if there is a steam seal leakage in the back-pressure steam turbine equipment in the petrochemical industry, the exhaust steam is usually extracted through a steam evacuator and condensed into condensate by a circulating water cooler. Since the pressure of this part of condensate is low, it cannot return to the steam system and needs to be discharged into the ditch. The sewage in the ditch is then treated, resulting in a waste of water resources and an increase in the load of sewage treatment. Utility Model Content

[0003] In view of the defects of the prior art, the utility model provides a back-pressure steam turbine condensate recovery system, which, in order to recover this part of the loss, transforms the recovery process of the back-pressure steam turbine condensate, collects the condensate into a water storage tank, and then sends it to the circulating water system to achieve the purpose of energy saving.

[0004] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is a back-pressure steam turbine condensate recovery system, which includes a steam evacuator, a circulating water cooler, a steam condensate pipeline, a water storage tank, a submersible pump, a recovery pipeline, and a circulating water return pipeline; the steam evacuator is connected to the back-pressure steam turbine; the circulating water cooler is connected to the steam evacuator; the steam condensate pipeline is connected to the circulating water cooler; the water storage tank is connected to the steam condensate pipeline; the submersible pump is arranged inside the water storage tank, and the submersible pump is connected to a motor; the recovery pipeline is connected to the submersible pump, and a one-way valve and a stop valve are arranged on the recovery pipeline; the circulating water return pipeline is connected to the recovery pipeline; a liquid level sensor is arranged on the water storage tank, and the liquid level sensor is interlocked with the motor.

[0005] Furthermore, the liquid level sensor is electrically connected to a PLC device, and the PLC device is electrically connected to a frequency converter of the motor.

[0006] Furthermore, a drain valve is provided on the recovery pipeline, and the drain valve is located between the one-way valve and the stop valve.

[0007] Furthermore, the liquid level sensor comprises a float level gauge.

[0008] Furthermore, the circulating water return pipeline is a 0.4 Mpa circulating water return pipeline.

[0009] Furthermore, a pressure sensor is provided at the outlet position of the recovery pipeline to detect the pipeline pressure of the recovery pipeline.

[0010] Furthermore, a solenoid valve is arranged on the steam condensate pipeline, and the solenoid valve is interlocked with the pressure sensor.

[0011] Further, the pressure sensor is electrically connected to a PLC device, and the PLC device is electrically connected to the solenoid valve.

[0012] Furthermore, the water storage tank has a capacity of 10m 3 -15m 3 .

[0013] Furthermore, a sampler is provided on the steam condensate pipeline.

[0014] The beneficial effects of the utility model are as follows: the condensed water is recycled and transformed, and the condensed water is collected in a water storage tank. The liquid level sensor of the water storage tank is provided with a high liquid level interlock to start the submersible pump and a low liquid level interlock to stop the submersible pump, so as to achieve the purpose of energy saving; in addition, a one-way valve and a stop valve are provided on the outlet side of the submersible pump. The one-way valve can avoid the backflow of materials, which is safer and more reliable. The quality of the steam condensed water flowing out of the circulating water cooler is much higher than that of tap water, and it itself will not cause the problem of polluting the water quality of the circulating water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a process flow chart of the downstream of the steam condensate pipeline in the back pressure steam turbine condensate recovery system in one embodiment of the utility model;

[0016] Figure 2 It is a process flow chart of the upstream of the steam condensate pipeline in the back pressure steam turbine condensate recovery system in one embodiment of the utility model;

[0017] Figure 3 It is a process flow chart of the downstream of the steam condensate pipeline in the back-pressure steam turbine condensate recovery system in another embodiment of the utility model;

[0018] Figure 4 It is the steam condensate index table in the steam condensate pipeline;

[0019] Figure 5 It is the index table of circulating water in the circulating water return pipeline;

[0020] In the figure: 100, steam evacuator,

[0021] 200. Circulating water cooler,

[0022] 300, steam condensate pipeline, 310, solenoid valve,

[0023] 400, water storage tank, 410, liquid level sensor,

[0024] 500, submersible pump, 510, motor,

[0025] 600, recovery pipeline, 610, one-way valve, 620, stop valve, 630, shower valve, 640, pressure sensor,

[0026] 700. Circulating water return pipeline,

[0027] 800. Circulating water supply pipeline,

[0028] 10. Ditch. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1 and Figure 2 A back-pressure steam turbine condensate recovery system includes a steam evacuator 100, a circulating water cooler 200, a steam condensate pipeline 300, a water storage tank 400, a submersible pump 500, a recovery pipeline 600, and a circulating water return pipeline 700; the steam evacuator 100 is connected to the back-pressure steam turbine; the circulating water cooler 200 is connected to the steam evacuator 100; the steam condensate pipeline 300 is connected to the circulating water cooler 200; the water storage tank 400 is connected to the steam condensate pipeline 300; the submersible pump 500 is arranged inside the water storage tank 400, and the submersible pump 500 is connected to the motor 510; the recovery pipeline 600 is connected to the submersible pump 500, and a one-way valve 610 and a stop valve 620 are arranged on the recovery pipeline 600; the circulating water return pipeline 700 is connected to the recovery pipeline 600; the water storage tank 400 is provided with a liquid level sensor 410, and the liquid level sensor 410 is interlocked with the motor 510.

[0031] In order to recover this part of the condensate loss, the above-mentioned back-pressure steam turbine condensate recovery system recycles and transforms the condensate, collects the condensate into a water storage tank 400, and the liquid level sensor 410 of the water storage tank 400 is provided with a high liquid level interlock to start the submersible pump 500 and a low liquid level interlock to stop the submersible pump 500, so as to achieve the purpose of energy saving; in addition, a one-way valve 610 and a stop valve 620 are provided on the outlet side of the submersible pump 500, which can prevent the backflow of materials and facilitate the control of the recovery process; finally, the quality of the steam condensate flowing out of the circulating water cooler 200 is usually much higher than that of tap water, and it itself will not cause the problem of polluting the circulating water quality.

[0032] In one embodiment, the liquid level sensor 410 is electrically connected to the PLC device, and the PLC device is electrically connected to the frequency converter of the motor 510. In this embodiment, the condensed water is recovered into the water storage tank 400 through modification, and the water storage tank 400 is provided with a liquid level sensor 410. When the liquid level of the water storage tank 400 reaches 80%, the interlock automatically starts the submersible pump 500 to send it to the circulating water network, and the submersible pump 500 automatically stops at 30% liquid level, which can greatly reduce the production cost. Preferably, in one embodiment, the liquid level sensor 410 includes a float liquid level gauge.

[0033] In one embodiment, a drain valve 630 is provided on the recovery pipeline 600, and the drain valve 630 is located between the check valve 610 and the stop valve 620. The above-mentioned back-pressure steam turbine condensate recovery system is provided with a drain valve 630 between the check valve 610 and the stop valve 620. When the recovery pipeline 600 needs to be inspected, for example, when the internal pressure of the pipeline is abnormal, the stop valve 620 can be closed, and the material inside the recovery pipeline 600 can be discharged by the drain valve 630, which is convenient for maintenance and pipeline purging.

[0034] In one embodiment, the circulating water return pipeline 700 is a 0.4 Mpa circulating water return pipeline.

[0035] See also Figure 1 and Figure 3 In one embodiment, a pressure sensor 640 is provided at the outlet position of the recovery pipeline 600 to detect the pipeline pressure of the recovery pipeline 600. Further, in one embodiment, a solenoid valve 310 is provided on the steam condensate pipeline 300, and the solenoid valve 310 is interlocked with the pressure sensor 640. In the specific setting, in one embodiment, the pressure sensor 640 is electrically connected to the PLC device, and the PLC device is electrically connected to the solenoid valve 310. During the production process, the pressure sensor 640 detects the pipeline pressure of the recovery pipeline 600 and controls the pressure of the recovery pipeline 600 to be between 0.6Mpa and 0.7Mpa. When the pressure of the recovery pipeline 600 exceeds the safety range, the solenoid valve 310 is controlled to be closed, blocking the flow from the steam condensate pipeline 300 to the circulating water return pipeline 700. The original pipeline can be used to enable the flow of discharge to the ditch 10. With such a setting, the system is more flexible, thereby improving the reliability of the system operation.

[0036] Preferably, in one embodiment, the water storage tank 400 has a capacity of 10m 3 -15m 3 .

[0037] See also Figure 4 and Figure 5 In one embodiment, a sampler is provided on the steam condensate pipeline 300 to facilitate sampling. Usually, the quality of the steam condensate flowing out of the circulating water cooler 200 is much higher than that of tap water, and it will not cause the problem of polluting the circulating water quality.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 present invention.

[0039] In addition, 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.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

Claims

1. A back pressure steam turbine condensate recovery system, Features: include A steam evacuator connected to a back-pressure steam turbine; A circulating water cooler connected to the steam evacuator; A steam condensate water pipeline connected to the circulating water cooler; A water storage tank connected to the steam condensate pipeline; A submersible pump is arranged inside the water storage tank, and the submersible pump is connected to a motor; A recovery pipeline connected to the submersible pump, wherein a one-way valve and a stop valve are provided on the recovery pipeline; and A circulating water return pipeline connected to the recovery pipeline; The water storage tank is provided with a liquid level sensor, and the liquid level sensor is interlocked with the motor.

2. A back-pressure steam turbine condensate recovery system according to claim 1, Features: The liquid level sensor is electrically connected to a PLC device, and the PLC device is electrically connected to a frequency converter of the motor.

3. A back-pressure steam turbine condensate recovery system according to claim 1, Features: The recovery pipeline is provided with a drain valve, and the drain valve is located between the one-way valve and the stop valve.

4. A back-pressure steam turbine condensate recovery system according to any one of claims 1 to 3, Features: The liquid level sensor comprises a float level gauge.

5. A back-pressure steam turbine condensate recovery system according to any one of claims 1 to 3, Features: The circulating water return pipeline is a 0.4 Mpa circulating water return pipeline.

6. A back-pressure steam turbine condensate recovery system according to claim 5, Features: A pressure sensor is provided at the outlet position of the recovery pipeline to detect the pipeline pressure of the recovery pipeline.

7. A back-pressure steam turbine condensate recovery system according to claim 6, Features: A solenoid valve is arranged on the steam condensate pipeline, and the solenoid valve is interlocked with the pressure sensor.

8. A back-pressure steam turbine condensate recovery system according to claim 7, Features: The pressure sensor is electrically connected to a PLC device, and the PLC device is electrically connected to the solenoid valve.

9. A back-pressure steam turbine condensate recovery system according to any one of claims 1 to 3, Features: The water storage tank has a capacity of 10m 3 -15m 3 .

10. A back-pressure steam turbine condensate recovery system according to any one of claims 1 to 3, Features: A sampler is arranged on the steam condensate pipeline.

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