Energy-saving drainage system for normal drainage pipeline of high-pressure heater

Abstract

The utility model provides a high-pressure heater normal drainage pipeline energy-saving drainage system which comprises a high-heat heater and a deaerator, a drainage pipeline is connected between the high-heat heater and the deaerator, and a drainage pressurization pipeline is arranged on the drainage pipeline. The drainage pressurization pipeline is provided with an automatic drainage valve connected to the drainage pipeline in series, and at least one pressurization branch is connected to the automatic drainage valve in parallel; the pressurizing branch is provided with a pipeline pump and an automatic valve which are sequentially connected in series in the drainage flowing direction. In the low-load operation state, the automatic valve in one pressurization branch is switched on, the automatic drain valve is switched off, drain water passes through the pressurization branch, the pipeline pump is started, the drain water is pressurized through the pipeline pump, the drain water can overcome pressure difference and flow into the deaerator, heat circulation is maintained, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal power plant equipment, and particularly relates to an energy-saving drainage system for the normal drainage pipeline of a high-pressure heater. Background Art

[0002] In order to reduce the loss of working medium, the steam-side drain water of the surface heaters in a thermal power unit is collected and merged into the feed water. Although the thermal economy of the step-by-step gravity drainage method is poor, due to the simple and reliable system, small investment, no additional operating cost, and small maintenance workload, it is widely used in the high-pressure heating of thermal power units.

[0003] In the prior art, the Chinese utility model patent document with the authorization announcement number of CN220524093U discloses a high-pressure heater drain structure for a thermal power generating unit. The normal drain water of the high-pressure heater realizes the water level control of the high-pressure heater through a steam-liquid two-phase automatic drain valve group, and the drain water flows step by step by gravity to the deaerator; however, in some power plants, there is a height difference between the high-pressure heater and the deaerator. The unit needs to operate at a high load above a certain load to overcome the pressure difference between the high-pressure heater and the deaerator, and the high-pressure heater drain water can flow by gravity to the deaerator; however, in the low-load operating state below this load, the high-pressure heater drain water cannot flow by gravity to the deaerator. Currently, it is usually to cut the normal drain water of the high-pressure heater to the emergency drain water into the condenser, and the heat is carried away by the circulating water, resulting in heat loss and increasing the power supply coal consumption during deep peak shaving.

[0004] Therefore, it is necessary to design an energy-saving drainage system for the normal drainage pipeline of a high-pressure heater that can boost the drain water under low-load conditions, enable the drain water to overcome the pressure difference and flow into the deaerator, maintain the heat cycle, and reduce energy consumption to solve the current technical problems. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the utility model provides an energy-saving drainage system for the normal drainage pipeline of a high-pressure heater that can boost the drain water under low-load conditions, enable the drain water to overcome the pressure difference and flow into the deaerator, maintain the heat cycle, and reduce energy consumption.

[0006] The technical solution of the utility model is: an energy-saving drainage system for the normal drainage pipeline of a high-pressure heater, including: a high-pressure heater and a deaerator, a drain pipeline is connected between the high-pressure heater and the deaerator, and a drain water pressurization pipeline is arranged on the drain pipeline; the drain water pressurization pipeline has an automatic drain valve connected in series on the drain pipeline, and at least one pressurization branch is connected in parallel to the automatic drain valve; the pressurization branch has a pipeline pump and an automatic valve connected in series in sequence along the drain water flow direction.

[0007] The pressurization branch further has a manual valve, and the manual valve, the pipeline pump, and the automatic valve are connected in series.

[0008] The automatic valve is an electrically controlled valve.

[0009] A check valve is arranged between the automatic valve and the pipeline pump, and the check valve conducts unidirectionally from the pipeline pump to the automatic valve.

[0010] The pipeline pump is a centrifugal pump, and a sealed water supply pipeline is connected to the pipeline pump, and a water supply valve is arranged on the sealed water supply pipeline.

[0011] The water supply valve is an electrically controlled valve.

[0012] A manual drain valve is connected to the drain pipeline.

[0013] The automatic drain valve is an electrically controlled valve.

[0014] The high-pressure heater is connected to the condenser through an emergency drain pipeline.

[0015] Two pressurization branches are connected in parallel to the automatic drain valve.

[0016] Advantages of the present utility model: In the present utility model, under the high-load operation state, the automatic valve is closed, the automatic drain valve is turned on, and the drain water flows from the high-temperature heater to the deaerator by gravity; under the low-load operation state, the automatic valve in one pressurization branch is turned on, the automatic drain valve is closed, the drain water passes through the pressurization branch, the pipeline pump starts, and the drain water is pressurized by the pipeline pump so that the drain water can overcome the pressure difference and flow into the deaerator, maintaining the heat cycle and reducing energy consumption. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the energy-saving drain water system for the normal drain pipeline of the high-pressure heater in the present utility model.

[0018] Figure 2 It is the drain water pressurization pipeline in the present utility model. Detailed Embodiments

[0019] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the drawings. The description of the exemplary embodiments is merely illustrative and does not constitute any limitation to the present utility model and its application or use. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present utility model thorough and complete and to fully convey the scope of the present utility model to those skilled in the art. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions, and numerical values described in these embodiments should be construed as merely exemplary and not as limitations.

[0020] In the present utility model, the terms "first", "second" and similar terms do not denote any order, quantity or importance, but are only used to distinguish different parts. Terms such as "comprising" or "including" mean that the elements before this word cover the elements listed after this word, and do not exclude the possibility of also covering other elements. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0021] As Figure 1 and 2 shown, the energy-saving drainage system for the normal drainage pipeline of the high-pressure heater includes: a high-pressure heater 2 and a deaerator 1. A drainage pipeline 3 is connected between the high-pressure heater 2 and the deaerator 1, and a drainage pressurization pipeline 4 is arranged on the drainage pipeline 3; the drainage pressurization pipeline 4 has an automatic drain valve 41 connected in series on the drainage pipeline 3, and at least one pressurization branch 42 is connected in parallel to the automatic drain valve 41; the pressurization branch 42 has a pipeline pump 421 and an automatic valve 422 connected in series in sequence along the drainage flow direction. In this embodiment, in the high-load operation state, the automatic valve 422 is cut off and the automatic drain valve 41 is turned on, and the drainage flows from the high-pressure heater 2 to the deaerator 1 by gravity; in the low-load operation state, the automatic valve 422 in one pressurization branch 42 is turned on, the automatic drain valve 41 is cut off, the drainage passes through the pressurization branch 42, the pipeline pump 421 is started, and the drainage is pressurized by the pipeline pump 421 so that the drainage can overcome the pressure difference and flow into the deaerator to maintain the heat cycle and reduce energy consumption.

[0022] In some embodiments, the pressurization branch 42 further has a manual valve 423. The manual valve 423, the pipeline pump 421 and the automatic valve 422 are connected in series. The cut-off or connection of the pressurization branch 42 can be controlled manually through the manual valve 423, and the corresponding pressurization branch 42 can be cut off manually when the automatic valve 422 fails or needs maintenance.

[0023] In some embodiments, the automatic valve 422 is an electric control valve, and the automatic drain valve 41 is an electric control valve; both the automatic drain pump 41 and the automatic valve 422 are connected to the controller. According to the load condition of the unit, the controller controls the automatic drain pump 41 and the automatic valve 422 to switch between the cut-off and connection states.

[0024] In some embodiments, a check valve 424 is arranged between the automatic valve 422 and the pipeline pump 421. The check valve 424 conducts unidirectionally from the pipeline pump 421 to the automatic valve 422, and the check valve 424 can prevent the drainage from flowing back in the pressurization branch 42.

[0025] In some embodiments, the pipeline pump 421 is a centrifugal pump. A sealed water supply pipeline 43 is connected to the pipeline pump 421. The sealed water supply pipeline 43 is used to supply water to the mechanical seal of the centrifugal pump. A water supply valve 431 is provided on the sealed water supply pipeline 43. Opening the water supply valve 431 can connect the sealed water supply pipeline 43 to supply water to the mechanical seal of the centrifugal pump. More specifically, the centrifugal pump is a centrifugal pump resistant to 200 °C.

[0026] In some embodiments, the water supply valve 431 is an electrically controlled valve. The water supply valve 431 is connected to the controller and is controlled by the controller to be cut off or connected.

[0027] In some embodiments, a manual drain valve 31 is connected to the drain pipeline 3.

[0028] In some embodiments, the high-pressure heater 2 is connected to the condenser 6 through an emergency drain pipeline 5. In an emergency state, emergency drainage is carried out to the condenser 6 through the emergency drain pipeline 5.

[0029] In some embodiments, two pressurizing branches 42 are connected in parallel to the automatic drain valve 41. One of the two pressurizing branches 42 is in use and the other is in reserve to improve the reliability and stability of the system.

[0030] So far, the embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0031] The above-described embodiments only represent some implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. An energy-saving drainage system for the normal drainage pipeline of a high-pressure heater, characterized in that, Including: A high-temperature heater and a deaerator, a drain pipe is connected between the high-temperature heater and the deaerator, and a drain pressure pipeline is arranged on the drain pipe; The drain pressure pipeline has an automatic drain valve connected in series on the drain pipe, and at least one pressure branch is connected in parallel to the automatic drain valve; The pressure branch has a pipeline pump and an automatic valve connected in series in sequence along the drain flow direction.

2. The energy-saving drainage system for the normal drainage pipeline of the high-pressure heater according to claim 1, characterized in that: The pressure branch also has a manual valve, and the manual valve, the pipeline pump, and the automatic valve are connected in series.

3. The energy-saving drainage system for the normal drainage pipeline of the high-pressure heater according to claim 2, characterized in that: The automatic valve is an electrically controlled valve.

4. The energy-saving drainage system for the normal drainage pipeline of the high-pressure heater according to claim 1, wherein: A check valve is arranged between the automatic valve and the pipeline pump, and the check valve conducts unidirectionally from the pipeline pump to the automatic valve.

5. The energy-saving drainage system for the normal drainage pipeline of the high-pressure heater according to claim 1, characterized in that: The pipeline pump is a centrifugal pump, a seal water supply pipeline is connected to the pipeline pump, and a water supply valve is arranged on the seal water supply pipeline.

6. The energy-saving drainage system for the normal drainage pipeline of the high-pressure heater according to claim 5, characterized in that: The water supply valve is an electrically controlled valve.

7. The energy-saving drain system for the normal drain pipeline of the high-pressure heater according to claim 1, wherein: A manual drain valve is connected to the drain pipe.

8. The energy-saving drainage system for the normal drainage pipeline of the high-pressure heater according to claim 1, characterized in that: The automatic drain valve is an electrically controlled valve.

9. The energy-saving drainage system for the normal drainage pipeline of the high-pressure heater according to claim 1, characterized in that: The high-pressure heater is connected to a condenser through an emergency drain pipeline.

10. The energy-saving drainage system for the normal drainage pipeline of the high-pressure heater according to claim 1, characterized in that: Two pressure branches are connected in parallel to the automatic drain valve.

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